diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..e126f2a
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,215 @@
+## GITATTRIBUTES FOR WEB PROJECTS
+#
+# These settings are for any web project.
+#
+# Details per file setting:
+#   text    These files should be normalized (i.e. convert CRLF to LF).
+#   binary  These files are binary and should be left untouched.
+#
+# Note that binary is a macro for -text -diff.
+######################################################################
+
+# Auto detect
+##   Handle line endings automatically for files detected as
+##   text and leave all files detected as binary untouched.
+##   This will handle all files NOT defined below.
+*                 text=auto
+
+# Source code
+*.bash            text eol=lf
+*.bat             text eol=crlf
+*.cmd             text eol=crlf
+*.coffee          text
+*.css             text diff=css
+*.htm             text diff=html
+*.html            text diff=html
+*.inc             text
+*.ini             text
+*.js              text
+*.json            text
+*.jsx             text
+*.less            text
+*.ls              text
+*.map             text -diff
+*.od              text
+*.onlydata        text
+*.php             text diff=php
+*.pl              text
+*.ps1             text eol=crlf
+*.py              text diff=python
+*.rb              text diff=ruby
+*.sass            text
+*.scm             text
+*.scss            text diff=css
+*.sh              text eol=lf
+.husky/*          text eol=lf
+*.sql             text
+*.styl            text
+*.tag             text
+*.ts              text
+*.tsx             text
+*.xml             text
+*.xhtml           text diff=html
+
+# Docker
+Dockerfile        text
+
+# Documentation
+*.ipynb           text eol=lf
+*.markdown        text diff=markdown
+*.md              text diff=markdown
+*.mdwn            text diff=markdown
+*.mdown           text diff=markdown
+*.mkd             text diff=markdown
+*.mkdn            text diff=markdown
+*.mdtxt           text
+*.mdtext          text
+*.txt             text
+AUTHORS           text
+CHANGELOG         text
+CHANGES           text
+CONTRIBUTING      text
+COPYING           text
+copyright         text
+*COPYRIGHT*       text
+INSTALL           text
+license           text
+LICENSE           text
+NEWS              text
+readme            text
+*README*          text
+TODO              text
+
+# Templates
+*.dot             text
+*.ejs             text
+*.erb             text
+*.haml            text
+*.handlebars      text
+*.hbs             text
+*.hbt             text
+*.jade            text
+*.latte           text
+*.mustache        text
+*.njk             text
+*.phtml           text
+*.svelte          text
+*.tmpl            text
+*.tpl             text
+*.twig            text
+*.vue             text
+
+# Configs
+*.cnf             text
+*.conf            text
+*.config          text
+.editorconfig     text
+.env              text
+.gitattributes    text
+.gitconfig        text
+.htaccess         text
+*.lock            text -diff
+package.json      text eol=lf
+package-lock.json text eol=lf -diff
+pnpm-lock.yaml    text eol=lf -diff
+.prettierrc       text
+yarn.lock         text -diff
+*.toml            text
+*.yaml            text
+*.yml             text
+browserslist      text
+Makefile          text
+makefile          text
+# Fixes syntax highlighting on GitHub to allow comments
+tsconfig.json     linguist-language=JSON-with-Comments
+
+# Heroku
+Procfile          text
+
+# Graphics
+*.ai              binary
+*.bmp             binary
+*.eps             binary
+*.gif             binary
+*.gifv            binary
+*.ico             binary
+*.jng             binary
+*.jp2             binary
+*.jpg             binary
+*.jpeg            binary
+*.jpx             binary
+*.jxr             binary
+*.pdf             binary
+*.png             binary
+*.psb             binary
+*.psd             binary
+# SVG treated as an asset (binary) by default.
+*.svg             text
+# If you want to treat it as binary,
+# use the following line instead.
+# *.svg           binary
+*.svgz            binary
+*.tif             binary
+*.tiff            binary
+*.wbmp            binary
+*.webp            binary
+
+# Audio
+*.kar             binary
+*.m4a             binary
+*.mid             binary
+*.midi            binary
+*.mp3             binary
+*.ogg             binary
+*.ra              binary
+
+# Video
+*.3gpp            binary
+*.3gp             binary
+*.as              binary
+*.asf             binary
+*.asx             binary
+*.avi             binary
+*.fla             binary
+*.flv             binary
+*.m4v             binary
+*.mng             binary
+*.mov             binary
+*.mp4             binary
+*.mpeg            binary
+*.mpg             binary
+*.ogv             binary
+*.swc             binary
+*.swf             binary
+*.webm            binary
+
+# Archives
+*.7z              binary
+*.gz              binary
+*.jar             binary
+*.rar             binary
+*.tar             binary
+*.zip             binary
+
+# Fonts
+*.ttf             binary
+*.eot             binary
+*.otf             binary
+*.woff            binary
+*.woff2           binary
+
+# Executables
+*.exe             binary
+*.pyc             binary
+# Prevents massive diffs caused by vendored, minified files
+**/.yarn/releases/**   binary
+**/.yarn/plugins/**    binary
+
+# RC files (like .babelrc or .eslintrc)
+*.*rc             text
+
+# Ignore files (like .npmignore or .gitignore)
+*.*ignore         text
+
+# Prevents massive diffs from built files
+dist/*            binary
\ No newline at end of file
diff --git a/fonts/BenchNine-Bold.ttf b/fonts/BenchNine-Bold.ttf
new file mode 100644
index 0000000..14ff96b
Binary files /dev/null and b/fonts/BenchNine-Bold.ttf differ
diff --git a/fonts/BenchNine-Light.ttf b/fonts/BenchNine-Light.ttf
new file mode 100644
index 0000000..143ff0c
Binary files /dev/null and b/fonts/BenchNine-Light.ttf differ
diff --git a/fonts/BenchNine-Regular.ttf b/fonts/BenchNine-Regular.ttf
new file mode 100644
index 0000000..a860a8b
Binary files /dev/null and b/fonts/BenchNine-Regular.ttf differ
diff --git a/fonts/DESCRIPTION.en_us.html b/fonts/DESCRIPTION.en_us.html
new file mode 100644
index 0000000..5d63ed4
--- /dev/null
+++ b/fonts/DESCRIPTION.en_us.html
@@ -0,0 +1,5 @@
+<p>The design of BenchNine is loosely based on the look of the ink spreads and
+bleeds characteristic of traditional or vernacular woodcut type. The design
+takes a mash-up of a number of old Stephenson Blake designs and rounds the
+corners a little. In theory the face should work well for headlines that want
+to stand out just a little from the crowd.</p>
\ No newline at end of file
diff --git a/fonts/FONTLOG.txt b/fonts/FONTLOG.txt
new file mode 100644
index 0000000..ab5e754
--- /dev/null
+++ b/fonts/FONTLOG.txt
@@ -0,0 +1,55 @@
+FONTLOG for BenchNine fonts
+
+This file provides detailed information on the BenchNine 
+Font Software.
+
+This information should be distributed along with the 
+BenchNine fonts and any derivative works.
+
+Basic Font Information
+
+The design of Benchnine is loosely based on the look of the ink spreads and
+bleeds characteristic of traditional or vernacular woodcut type. The design
+takes a mash-up of a number of old Stephenson Blake designs and rounds the
+corners a little. In theory the face should work well for headlines that want
+to stand out just a little from the crowd.
+
+BenchNine is a Unicode typeface family that supports languages 
+that use the Latin script and its variants, and could be 
+expanded to support other scripts.
+
+More specifically, this release supports the following 
+Unicode ranges: Latin-1
+
+There are 5 Source files:
+
+1. FONT.ufo Original Source Files in UFO format
+
+2. FONT.sfd Original Source Files for FontForge
+
+3. FONT.otf OpenType font
+
+4. Font-TTF.sfd TrueType outlines that correspond to the unhinged TTF file
+
+5. Font-TTF.sfd TrueType font, unhinted
+
+To contribute to the project contact Vernon Adams
+at vern@newtypography.co.uk
+
+ChangeLog
+
+19th September 2012 Vernon Adams BenchNine v1.001
+- Initial release
+- Three initial weights; Regular, Bold, Light.
+
+24th September 2012
+- Fixes to metadata and subsetting fonts for latin and latin-extended
+
+If you make modifications be sure to add your name (N), 
+email (E), web-address (if you have one) (W) and 
+description (D). This list is in alphabetical order.
+
+N: Vernon Adams
+E: vern@newtypography.co.uk
+W: code.newtypography.co.uk
+D: Original Type Designer
diff --git a/fonts/METADATA.pb b/fonts/METADATA.pb
new file mode 100644
index 0000000..22bbcb6
--- /dev/null
+++ b/fonts/METADATA.pb
@@ -0,0 +1,35 @@
+name: "BenchNine"
+designer: "Vernon Adams"
+license: "OFL"
+category: "SANS_SERIF"
+date_added: "2012-09-24"
+fonts {
+  name: "BenchNine"
+  style: "normal"
+  weight: 300
+  filename: "BenchNine-Light.ttf"
+  post_script_name: "BenchNine-Light"
+  full_name: "BenchNine Light"
+  copyright: "Copyright (c) 2012, vernon adams (vern@newtypography.co.uk), with Reserved Font Name \'BenchNine\'"
+}
+fonts {
+  name: "BenchNine"
+  style: "normal"
+  weight: 400
+  filename: "BenchNine-Regular.ttf"
+  post_script_name: "BenchNine-Regular"
+  full_name: "BenchNine Regular"
+  copyright: "Copyright (c) 2012, vernon adams (vern@newtypography.co.uk), with Reserved Font Name \'BenchNine\'"
+}
+fonts {
+  name: "BenchNine"
+  style: "normal"
+  weight: 700
+  filename: "BenchNine-Bold.ttf"
+  post_script_name: "BenchNine-Bold"
+  full_name: "BenchNine Bold"
+  copyright: "Copyright (c) 2012, vernon adams (vern@newtypography.co.uk), with Reserved Font Name \'BenchNine\'"
+}
+subsets: "latin"
+subsets: "latin-ext"
+subsets: "menu"
diff --git a/fonts/OFL.txt b/fonts/OFL.txt
new file mode 100644
index 0000000..ff755a8
--- /dev/null
+++ b/fonts/OFL.txt
@@ -0,0 +1,93 @@
+Copyright (c) 2012, vernon adams (vern@newtypography.co.uk), with Reserved Font Name 'BenchNine'.
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+http://scripts.sil.org/OFL
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.
\ No newline at end of file
diff --git a/index.html b/index.html
index dc9f3f5..2444bd2 100644
--- a/index.html
+++ b/index.html
@@ -1,154 +1,163 @@
 <!DOCTYPE html>
-<html lang="en">
+<html data-theme="auto" lang="en">
 
 <head>
     <meta charset="UTF-8">
     <meta http-equiv="X-UA-Compatible" content="IE=edge">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
-    <link rel="stylesheet" href="style.css">
+    <link href="https://unpkg.com/@csstools/normalize.css" rel="stylesheet" />
+    <link rel="stylesheet" href="stylesheets/main.css">
+    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css"/>
     <title>CSS Responsive Web Design & Key Concepts</title>
 </head>
 
-<body>
-    <h1>Feline Flexbox with Cat Cards!</h1>
-
-    <h2>A purrfect example of the power of flexbox 😻</h2>
-
-    <p>Cat ipsum dolor sit amet, always hungry, for meow yet paw at your belly. Scratch the furniture sleep on dog bed, force dog to sleep on floor. Have secret plans sleeps on my head do doodoo in the litter-box, clickityclack on the piano, be frumpygrumpy. Play with twist ties. Eat half my food and ask for more. Show belly play with twist ties. The dog smells bad.</p>
-
-    <div class="card-container">
+<body class = "page">
+    <nav class = "navbar navbar--style">
+        <span class = "navbar__element">
+            <span class = navbar__element--burger><i class="fa fa-bars"></i></span>
+        <ul class = "navbar__list navbar__list--style">    
+            <li class = "navbar__item"><a class = "navbar__anchor navbar__anchor--style" href="#dopey">Dopey</a></li>
+            <li class = "navbar__item"><a class = "navbar__anchor navbar__anchor--style" href="#blobby">Blobby</a></li>
+            <li class = "navbar__item"><a class = "navbar__anchor navbar__anchor--style" href="#nibbles">Nibbles</a></li>
+            <li class = "navbar__item"><a class = "navbar__anchor navbar__anchor--style" href="#doughnut">Doughnut</a></li>   
+        </ul>
+    </span>
+    </nav>
+    <section class = "page__intro">
+        <h1 class = "page__heading page__heading--style">Feline Flexbox with Cat Cards!</h1>
+        <h2 class = "page__sub-heading page__sub-heading--style">A purrfect example of the power of flexbox</h2>
+        <p class = "page__text page__text--style">The cat, commonly referred to as the domestic cat or house cat, is the only domesticated species in the family Felidae. Recent advances in archaeology and genetics have shown that the domestication of the cat occurred in the Near East around 7500 BC. You can have fun looking at the the ever changing cat images and facts on this page.</p>
+    </section>
 
+    <section class="page__container">
         <div class="card">
-            <h3 class="cat-name"></h3>
-            <img src="" alt="" class="pet-pic">
-            <p class="species"> </p>
-            <p class="fav-foods"> </p>
-            <p class="birth-year"> </p>
+            <h3 class="card__cat-name"></h3>
+            <img src="" alt="" class="card__image">
+            <p class="card__species"> </p>
+            <p class="card__origin"> </p>
+            <p class="card__temperament"> </p>
         </div>
 
         <div class="card">
-            <h3 class="cat-name"></h3>
-            <img src="" alt="" class="pet-pic">
-            <p class="species"> </p>
-            <p class="fav-foods"> </p>
-            <p class="birth-year"> </p>
+            <h3 class="card__cat-name"></h3>
+            <img src="" alt="" class="card__image">
+            <p class="card__species"> </p>
+            <p class="card__origin"> </p>
+            <p class="card__temperament"> </p>
         </div>
 
         <div class="card">
-            <h3 class="cat-name"></h3>
-            <img src="" alt="" class="pet-pic">
-            <p class="species"> </p>
-            <p class="fav-foods"> </p>
-            <p class="birth-year"> </p>
+            <h3 class="card__cat-name"></h3>
+            <img src="" alt="" class="card__image">
+            <p class="card__species"> </p>
+            <p class="card__origin"> </p>
+            <p class="card__temperament"> </p>
         </div>
 
         <div class="card">
-            <h3 class="cat-name"></h3>
-            <img src="" alt="" class="pet-pic">
-            <p class="species"> </p>
-            <p class="fav-foods"> </p>
-            <p class="birth-year"> </p>
+            <h3 class="card__cat-name"></h3>
+            <img src="" alt="" class="card__image">
+            <p class="card__species"> </p>
+            <p class="card__origin"> </p>
+            <p class="card__temperament"> </p>
         </div>
 
         <div class="card">
-            <h3 class="cat-name"></h3>
-            <img src="" alt="" class="pet-pic">
-            <p class="species"> </p>
-            <p class="fav-foods"> </p>
-            <p class="birth-year"> </p>
+            <h3 class="card__cat-name"></h3>
+            <img src="" alt="" class="card__image">
+            <p class="card__species"> </p>
+            <p class="card__origin"> </p>
+            <p class="card__temperament"> </p>
         </div>
 
         <div class="card">
-            <h3 class="cat-name"></h3>
-            <img src="" alt="" class="pet-pic">
-            <p class="species"> </p>
-            <p class="fav-foods"> </p>
-            <p class="birth-year"> </p>
+            <h3 class="card__cat-name"></h3>
+            <img src="" alt="" class="card__image">
+            <p class="card__species"> </p>
+            <p class="card__origin"> </p>
+            <p class="card__temperament"> </p>
         </div>
 
         <div class="card">
-            <h3 class="cat-name"></h3>
-            <img src="" alt="" class="pet-pic">
-            <p class="species"> </p>
-            <p class="fav-foods"> </p>
-            <p class="birth-year"> </p>
+            <h3 class="card__cat-name"></h3>
+            <img src="" alt="" class="card__image">
+            <p class="card__species"> </p>
+            <p class="card__origin"> </p>
+            <p class="card__temperament"> </p>
         </div>
 
         <div class="card">
-            <h3 class="cat-name"></h3>
-            <img src="" alt="" class="pet-pic">
-            <p class="species"> </p>
-            <p class="fav-foods"> </p>
-            <p class="birth-year"> </p>
+            <h3 class="card__cat-name"></h3>
+            <img src="" alt="" class="card__image">
+            <p class="card__species"> </p>
+            <p class="card__origin"> </p>
+            <p class="card__temperament"> </p>
         </div>
 
         <div class="card">
-            <h3 class="cat-name"></h3>
-            <img src="" alt="" class="pet-pic">
-            <p class="species"> </p>
-            <p class="fav-foods"> </p>
-            <p class="birth-year"> </p>
+            <h3 class="card__cat-name"></h3>
+            <img src="" alt="" class="card__image">
+            <p class="card__species"> </p>
+            <p class="card__origin"> </p>
+            <p class="card__temperament"> </p>
         </div>
 
         <div class="card">
-            <h3 class="cat-name"></h3>
-            <img src="" alt="" class="pet-pic">
-            <p class="species"> </p>
-            <p class="fav-foods"> </p>
-            <p class="birth-year"> </p>
+            <h3 class="card__cat-name"></h3>
+            <img src="" alt="" class="card__image">
+            <p class="card__species"> </p>
+            <p class="card__origin"> </p>
+            <p class="card__temperament"> </p>
         </div>
 
         <div class="card">
-            <h3 class="cat-name"></h3>
-            <img src="" alt="" class="pet-pic">
-            <p class="species"> </p>
-            <p class="fav-foods"> </p>
-            <p class="birth-year"> </p>
+            <h3 class="card__cat-name"></h3>
+            <img src="" alt="" class="card__image">
+            <p class="card__species"> </p>
+            <p class="card__origin"> </p>
+            <p class="card__temperament"> </p>
         </div>
 
         <div class="card">
-            <h3 class="cat-name"></h3>
-            <img src="" alt="" class="pet-pic">
-            <p class="species"> </p>
-            <p class="fav-foods"> </p>
-            <p class="birth-year"> </p>
+            <h3 class="card__cat-name"></h3>
+            <img src="" alt="" class="card__image">
+            <p class="card__species"> </p>
+            <p class="card__origin"> </p>
+            <p class="card__temperament"> </p>
         </div>
 
         <div class="card">
-            <h3 class="cat-name"></h3>
-            <img src="" alt="" class="pet-pic">
-            <p class="species"> </p>
-            <p class="fav-foods"> </p>
-            <p class="birth-year"> </p>
+            <h3 class="card__cat-name"></h3>
+            <img src="" alt="" class="card__image">
+            <p class="card__species"> </p>
+            <p class="card__origin"> </p>
+            <p class="card__temperament"> </p>
         </div>
 
         <div class="card">
-            <h3 class="cat-name"></h3>
-            <img src="" alt="" class="pet-pic">
-            <p class="species"> </p>
-            <p class="fav-foods"> </p>
-            <p class="birth-year"> </p>
+            <h3 class="card__cat-name"></h3>
+            <img src="" alt="" class="card__image">
+            <p class="card__species"> </p>
+            <p class="card__origin"> </p>
+            <p class="card__temperament"> </p>
         </div>
 
         <div class="card">
-            <h3 class="cat-name"></h3>
-            <img src="" alt="" class="pet-pic">
-            <p class="species"> </p>
-            <p class="fav-foods"> </p>
-            <p class="birth-year"> </p>
+            <h3 class="card__cat-name"></h3>
+            <img src="" alt="" class="card__image">
+            <p class="card__species"> </p>
+            <p class="card__origin"> </p>
+            <p class="card__temperament"> </p>
         </div>
 
         <div class="card">
-            <h3 class="cat-name"></h3>
-            <img src="" alt="" class="pet-pic">
-            <p class="species"> </p>
-            <p class="fav-foods"> </p>
-            <p class="birth-year"> </p>
+            <h3 class="card__cat-name"></h3>
+            <img src="" alt="" class="card__image">
+            <p class="card__species"> </p>
+            <p class="card__origin"> </p>
+            <p class="card__temperament"> </p>
         </div>
-
-
-
-    </div>
+    </section>
 
     <script src="script.js"></script>
 
diff --git a/node_modules/.package-lock.json b/node_modules/.package-lock.json
new file mode 100644
index 0000000..0053187
--- /dev/null
+++ b/node_modules/.package-lock.json
@@ -0,0 +1,94 @@
+{
+  "name": "css-key-concepts-responsive-design",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "node_modules/data-uri-to-buffer": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/data-uri-to-buffer/-/data-uri-to-buffer-4.0.1.tgz",
+      "integrity": "sha512-0R9ikRb668HB7QDxT1vkpuUBtqc53YyAwMwGeUFKRojY/NWKvdZ+9UYtRfGmhqNbRkTSVpMbmyhXipFFv2cb/A==",
+      "engines": {
+        "node": ">= 12"
+      }
+    },
+    "node_modules/fetch-blob": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/fetch-blob/-/fetch-blob-3.2.0.tgz",
+      "integrity": "sha512-7yAQpD2UMJzLi1Dqv7qFYnPbaPx7ZfFK6PiIxQ4PfkGPyNyl2Ugx+a/umUonmKqjhM4DnfbMvdX6otXq83soQQ==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/jimmywarting"
+        },
+        {
+          "type": "paypal",
+          "url": "https://paypal.me/jimmywarting"
+        }
+      ],
+      "dependencies": {
+        "node-domexception": "^1.0.0",
+        "web-streams-polyfill": "^3.0.3"
+      },
+      "engines": {
+        "node": "^12.20 || >= 14.13"
+      }
+    },
+    "node_modules/formdata-polyfill": {
+      "version": "4.0.10",
+      "resolved": "https://registry.npmjs.org/formdata-polyfill/-/formdata-polyfill-4.0.10.tgz",
+      "integrity": "sha512-buewHzMvYL29jdeQTVILecSaZKnt/RJWjoZCF5OW60Z67/GmSLBkOFM7qh1PI3zFNtJbaZL5eQu1vLfazOwj4g==",
+      "dependencies": {
+        "fetch-blob": "^3.1.2"
+      },
+      "engines": {
+        "node": ">=12.20.0"
+      }
+    },
+    "node_modules/node-domexception": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/node-domexception/-/node-domexception-1.0.0.tgz",
+      "integrity": "sha512-/jKZoMpw0F8GRwl4/eLROPA3cfcXtLApP0QzLmUT/HuPCZWyB7IY9ZrMeKw2O/nFIqPQB3PVM9aYm0F312AXDQ==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/jimmywarting"
+        },
+        {
+          "type": "github",
+          "url": "https://paypal.me/jimmywarting"
+        }
+      ],
+      "engines": {
+        "node": ">=10.5.0"
+      }
+    },
+    "node_modules/node-fetch": {
+      "version": "3.3.2",
+      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-3.3.2.tgz",
+      "integrity": "sha512-dRB78srN/l6gqWulah9SrxeYnxeddIG30+GOqK/9OlLVyLg3HPnr6SqOWTWOXKRwC2eGYCkZ59NNuSgvSrpgOA==",
+      "dependencies": {
+        "data-uri-to-buffer": "^4.0.0",
+        "fetch-blob": "^3.1.4",
+        "formdata-polyfill": "^4.0.10"
+      },
+      "engines": {
+        "node": "^12.20.0 || ^14.13.1 || >=16.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/node-fetch"
+      }
+    },
+    "node_modules/web-streams-polyfill": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/web-streams-polyfill/-/web-streams-polyfill-3.2.1.tgz",
+      "integrity": "sha512-e0MO3wdXWKrLbL0DgGnUV7WHVuw9OUvL4hjgnPkIeEvESk74gAITi5G606JtZPp39cd8HA9VQzCIvA49LpPN5Q==",
+      "engines": {
+        "node": ">= 8"
+      }
+    }
+  },
+  "scripts": {
+    "sass-build": "sass/main.scss stylesheets/main.css"
+  }
+}
diff --git a/node_modules/data-uri-to-buffer/README.md b/node_modules/data-uri-to-buffer/README.md
new file mode 100644
index 0000000..d0f2e05
--- /dev/null
+++ b/node_modules/data-uri-to-buffer/README.md
@@ -0,0 +1,88 @@
+data-uri-to-buffer
+==================
+### Generate a Buffer instance from a [Data URI][rfc] string
+[![Build Status](https://travis-ci.org/TooTallNate/node-data-uri-to-buffer.svg?branch=master)](https://travis-ci.org/TooTallNate/node-data-uri-to-buffer)
+
+This module accepts a ["data" URI][rfc] String of data, and returns a
+node.js `Buffer` instance with the decoded data.
+
+
+Installation
+------------
+
+Install with `npm`:
+
+``` bash
+$ npm install data-uri-to-buffer
+```
+
+
+Example
+-------
+
+``` js
+import dataUriToBuffer from 'data-uri-to-buffer';
+
+// plain-text data is supported
+let uri = 'data:,Hello%2C%20World!';
+let decoded = dataUriToBuffer(uri);
+console.log(decoded.toString());
+// 'Hello, World!'
+
+// base64-encoded data is supported
+uri = 'data:text/plain;base64,SGVsbG8sIFdvcmxkIQ%3D%3D';
+decoded = dataUriToBuffer(uri);
+console.log(decoded.toString());
+// 'Hello, World!'
+```
+
+
+API
+---
+
+### dataUriToBuffer(String uri) → Buffer
+
+The `type` property on the Buffer instance gets set to the main type portion of
+the "mediatype" portion of the "data" URI, or defaults to `"text/plain"` if not
+specified.
+
+The `typeFull` property on the Buffer instance gets set to the entire
+"mediatype" portion of the "data" URI (including all parameters), or defaults
+to `"text/plain;charset=US-ASCII"` if not specified.
+
+The `charset` property on the Buffer instance gets set to the Charset portion of
+the "mediatype" portion of the "data" URI, or defaults to `"US-ASCII"` if the
+entire type is not specified, or defaults to `""` otherwise.
+
+*Note*: If the only the main type is specified but not the charset, e.g.
+`"data:text/plain,abc"`, the charset is set to the empty string. The spec only
+defaults to US-ASCII as charset if the entire type is not specified.
+
+
+License
+-------
+
+(The MIT License)
+
+Copyright (c) 2014 Nathan Rajlich &lt;nathan@tootallnate.net&gt;
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+'Software'), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+[rfc]: http://tools.ietf.org/html/rfc2397
diff --git a/node_modules/data-uri-to-buffer/dist/index.d.ts b/node_modules/data-uri-to-buffer/dist/index.d.ts
new file mode 100644
index 0000000..2a3d91e
--- /dev/null
+++ b/node_modules/data-uri-to-buffer/dist/index.d.ts
@@ -0,0 +1,15 @@
+/// <reference types="node" />
+export interface MimeBuffer extends Buffer {
+    type: string;
+    typeFull: string;
+    charset: string;
+}
+/**
+ * Returns a `Buffer` instance from the given data URI `uri`.
+ *
+ * @param {String} uri Data URI to turn into a Buffer instance
+ * @returns {Buffer} Buffer instance from Data URI
+ * @api public
+ */
+export declare function dataUriToBuffer(uri: string): MimeBuffer;
+export default dataUriToBuffer;
diff --git a/node_modules/data-uri-to-buffer/dist/index.js b/node_modules/data-uri-to-buffer/dist/index.js
new file mode 100644
index 0000000..4ddd079
--- /dev/null
+++ b/node_modules/data-uri-to-buffer/dist/index.js
@@ -0,0 +1,53 @@
+/**
+ * Returns a `Buffer` instance from the given data URI `uri`.
+ *
+ * @param {String} uri Data URI to turn into a Buffer instance
+ * @returns {Buffer} Buffer instance from Data URI
+ * @api public
+ */
+export function dataUriToBuffer(uri) {
+    if (!/^data:/i.test(uri)) {
+        throw new TypeError('`uri` does not appear to be a Data URI (must begin with "data:")');
+    }
+    // strip newlines
+    uri = uri.replace(/\r?\n/g, '');
+    // split the URI up into the "metadata" and the "data" portions
+    const firstComma = uri.indexOf(',');
+    if (firstComma === -1 || firstComma <= 4) {
+        throw new TypeError('malformed data: URI');
+    }
+    // remove the "data:" scheme and parse the metadata
+    const meta = uri.substring(5, firstComma).split(';');
+    let charset = '';
+    let base64 = false;
+    const type = meta[0] || 'text/plain';
+    let typeFull = type;
+    for (let i = 1; i < meta.length; i++) {
+        if (meta[i] === 'base64') {
+            base64 = true;
+        }
+        else if (meta[i]) {
+            typeFull += `;${meta[i]}`;
+            if (meta[i].indexOf('charset=') === 0) {
+                charset = meta[i].substring(8);
+            }
+        }
+    }
+    // defaults to US-ASCII only if type is not provided
+    if (!meta[0] && !charset.length) {
+        typeFull += ';charset=US-ASCII';
+        charset = 'US-ASCII';
+    }
+    // get the encoded data portion and decode URI-encoded chars
+    const encoding = base64 ? 'base64' : 'ascii';
+    const data = unescape(uri.substring(firstComma + 1));
+    const buffer = Buffer.from(data, encoding);
+    // set `.type` and `.typeFull` properties to MIME type
+    buffer.type = type;
+    buffer.typeFull = typeFull;
+    // set the `.charset` property
+    buffer.charset = charset;
+    return buffer;
+}
+export default dataUriToBuffer;
+//# sourceMappingURL=index.js.map
\ No newline at end of file
diff --git a/node_modules/data-uri-to-buffer/dist/index.js.map b/node_modules/data-uri-to-buffer/dist/index.js.map
new file mode 100644
index 0000000..696504a
--- /dev/null
+++ b/node_modules/data-uri-to-buffer/dist/index.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"index.js","sourceRoot":"","sources":["../src/index.ts"],"names":[],"mappings":"AAMA;;;;;;GAMG;AACH,MAAM,UAAU,eAAe,CAAC,GAAW;IAC1C,IAAI,CAAC,SAAS,CAAC,IAAI,CAAC,GAAG,CAAC,EAAE;QACzB,MAAM,IAAI,SAAS,CAClB,kEAAkE,CAClE,CAAC;KACF;IAED,iBAAiB;IACjB,GAAG,GAAG,GAAG,CAAC,OAAO,CAAC,QAAQ,EAAE,EAAE,CAAC,CAAC;IAEhC,+DAA+D;IAC/D,MAAM,UAAU,GAAG,GAAG,CAAC,OAAO,CAAC,GAAG,CAAC,CAAC;IACpC,IAAI,UAAU,KAAK,CAAC,CAAC,IAAI,UAAU,IAAI,CAAC,EAAE;QACzC,MAAM,IAAI,SAAS,CAAC,qBAAqB,CAAC,CAAC;KAC3C;IAED,mDAAmD;IACnD,MAAM,IAAI,GAAG,GAAG,CAAC,SAAS,CAAC,CAAC,EAAE,UAAU,CAAC,CAAC,KAAK,CAAC,GAAG,CAAC,CAAC;IAErD,IAAI,OAAO,GAAG,EAAE,CAAC;IACjB,IAAI,MAAM,GAAG,KAAK,CAAC;IACnB,MAAM,IAAI,GAAG,IAAI,CAAC,CAAC,CAAC,IAAI,YAAY,CAAC;IACrC,IAAI,QAAQ,GAAG,IAAI,CAAC;IACpB,KAAK,IAAI,CAAC,GAAG,CAAC,EAAE,CAAC,GAAG,IAAI,CAAC,MAAM,EAAE,CAAC,EAAE,EAAE;QACrC,IAAI,IAAI,CAAC,CAAC,CAAC,KAAK,QAAQ,EAAE;YACzB,MAAM,GAAG,IAAI,CAAC;SACd;aAAM,IAAG,IAAI,CAAC,CAAC,CAAC,EAAE;YAClB,QAAQ,IAAI,IAAM,IAAI,CAAC,CAAC,CAAC,EAAE,CAAC;YAC5B,IAAI,IAAI,CAAC,CAAC,CAAC,CAAC,OAAO,CAAC,UAAU,CAAC,KAAK,CAAC,EAAE;gBACtC,OAAO,GAAG,IAAI,CAAC,CAAC,CAAC,CAAC,SAAS,CAAC,CAAC,CAAC,CAAC;aAC/B;SACD;KACD;IACD,oDAAoD;IACpD,IAAI,CAAC,IAAI,CAAC,CAAC,CAAC,IAAI,CAAC,OAAO,CAAC,MAAM,EAAE;QAChC,QAAQ,IAAI,mBAAmB,CAAC;QAChC,OAAO,GAAG,UAAU,CAAC;KACrB;IAED,4DAA4D;IAC5D,MAAM,QAAQ,GAAG,MAAM,CAAC,CAAC,CAAC,QAAQ,CAAC,CAAC,CAAC,OAAO,CAAC;IAC7C,MAAM,IAAI,GAAG,QAAQ,CAAC,GAAG,CAAC,SAAS,CAAC,UAAU,GAAG,CAAC,CAAC,CAAC,CAAC;IACrD,MAAM,MAAM,GAAG,MAAM,CAAC,IAAI,CAAC,IAAI,EAAE,QAAQ,CAAe,CAAC;IAEzD,sDAAsD;IACtD,MAAM,CAAC,IAAI,GAAG,IAAI,CAAC;IACnB,MAAM,CAAC,QAAQ,GAAG,QAAQ,CAAC;IAE3B,8BAA8B;IAC9B,MAAM,CAAC,OAAO,GAAG,OAAO,CAAC;IAEzB,OAAO,MAAM,CAAC;AACf,CAAC;AAED,eAAe,eAAe,CAAC"}
\ No newline at end of file
diff --git a/node_modules/data-uri-to-buffer/package.json b/node_modules/data-uri-to-buffer/package.json
new file mode 100644
index 0000000..9e42713
--- /dev/null
+++ b/node_modules/data-uri-to-buffer/package.json
@@ -0,0 +1,62 @@
+{
+  "name": "data-uri-to-buffer",
+  "version": "4.0.1",
+  "description": "Generate a Buffer instance from a Data URI string",
+  "type": "module",
+  "exports": "./dist/index.js",
+  "main": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "files": [
+    "dist",
+    "src"
+  ],
+  "scripts": {
+    "build": "tsc",
+    "test": "jest",
+    "prepublishOnly": "npm run build"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/TooTallNate/node-data-uri-to-buffer.git"
+  },
+  "engines": {
+    "node": ">= 12"
+  },
+  "keywords": [
+    "data",
+    "uri",
+    "datauri",
+    "data-uri",
+    "buffer",
+    "convert",
+    "rfc2397",
+    "2397"
+  ],
+  "author": "Nathan Rajlich <nathan@tootallnate.net> (http://n8.io/)",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/TooTallNate/node-data-uri-to-buffer/issues"
+  },
+  "homepage": "https://github.com/TooTallNate/node-data-uri-to-buffer",
+  "devDependencies": {
+    "@types/jest": "^27.0.2",
+    "@types/node": "^12.20.36",
+    "jest": "^27.3.1",
+    "ts-jest": "^27.0.7",
+    "typescript": "^4.4.4"
+  },
+  "jest": {
+    "preset": "ts-jest",
+    "globals": {
+      "ts-jest": {
+        "diagnostics": false,
+        "isolatedModules": true
+      }
+    },
+    "verbose": false,
+    "testEnvironment": "node",
+    "testMatch": [
+      "<rootDir>/test/**/*.test.ts"
+    ]
+  }
+}
diff --git a/node_modules/data-uri-to-buffer/src/index.ts b/node_modules/data-uri-to-buffer/src/index.ts
new file mode 100644
index 0000000..9e5749f
--- /dev/null
+++ b/node_modules/data-uri-to-buffer/src/index.ts
@@ -0,0 +1,68 @@
+export interface MimeBuffer extends Buffer {
+	type: string;
+	typeFull: string;
+	charset: string;
+}
+
+/**
+ * Returns a `Buffer` instance from the given data URI `uri`.
+ *
+ * @param {String} uri Data URI to turn into a Buffer instance
+ * @returns {Buffer} Buffer instance from Data URI
+ * @api public
+ */
+export function dataUriToBuffer(uri: string): MimeBuffer {
+	if (!/^data:/i.test(uri)) {
+		throw new TypeError(
+			'`uri` does not appear to be a Data URI (must begin with "data:")'
+		);
+	}
+
+	// strip newlines
+	uri = uri.replace(/\r?\n/g, '');
+
+	// split the URI up into the "metadata" and the "data" portions
+	const firstComma = uri.indexOf(',');
+	if (firstComma === -1 || firstComma <= 4) {
+		throw new TypeError('malformed data: URI');
+	}
+
+	// remove the "data:" scheme and parse the metadata
+	const meta = uri.substring(5, firstComma).split(';');
+
+	let charset = '';
+	let base64 = false;
+	const type = meta[0] || 'text/plain';
+	let typeFull = type;
+	for (let i = 1; i < meta.length; i++) {
+		if (meta[i] === 'base64') {
+			base64 = true;
+		} else if(meta[i]) {
+			typeFull += `;${  meta[i]}`;
+			if (meta[i].indexOf('charset=') === 0) {
+				charset = meta[i].substring(8);
+			}
+		}
+	}
+	// defaults to US-ASCII only if type is not provided
+	if (!meta[0] && !charset.length) {
+		typeFull += ';charset=US-ASCII';
+		charset = 'US-ASCII';
+	}
+
+	// get the encoded data portion and decode URI-encoded chars
+	const encoding = base64 ? 'base64' : 'ascii';
+	const data = unescape(uri.substring(firstComma + 1));
+	const buffer = Buffer.from(data, encoding) as MimeBuffer;
+
+	// set `.type` and `.typeFull` properties to MIME type
+	buffer.type = type;
+	buffer.typeFull = typeFull;
+
+	// set the `.charset` property
+	buffer.charset = charset;
+
+	return buffer;
+}
+
+export default dataUriToBuffer;
diff --git a/node_modules/fetch-blob/LICENSE b/node_modules/fetch-blob/LICENSE
new file mode 100644
index 0000000..0d31723
--- /dev/null
+++ b/node_modules/fetch-blob/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2019 David Frank
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/node_modules/fetch-blob/README.md b/node_modules/fetch-blob/README.md
new file mode 100644
index 0000000..fb3e198
--- /dev/null
+++ b/node_modules/fetch-blob/README.md
@@ -0,0 +1,106 @@
+# fetch-blob
+
+[![npm version][npm-image]][npm-url]
+[![build status][ci-image]][ci-url]
+[![coverage status][codecov-image]][codecov-url]
+[![install size][install-size-image]][install-size-url]
+
+A Blob implementation in Node.js, originally from [node-fetch](https://github.com/node-fetch/node-fetch).
+
+## Installation
+
+```sh
+npm install fetch-blob
+```
+
+<details>
+  <summary>Upgrading from 2x to 3x</summary>
+
+  Updating from 2 to 3 should be a breeze since there is not many changes to the blob specification.
+  The major cause of a major release is coding standards.
+    - internal WeakMaps was replaced with private fields
+    - internal Buffer.from was replaced with TextEncoder/Decoder
+    - internal buffers was replaced with Uint8Arrays
+    - CommonJS was replaced with ESM
+    - The node stream returned by calling `blob.stream()` was replaced with whatwg streams
+    - (Read "Differences from other blobs" for more info.)
+
+</details>
+
+<details>
+  <summary>Differences from other Blobs</summary>
+
+  - Unlike NodeJS `buffer.Blob` (Added in: v15.7.0) and browser native Blob this polyfilled version can't be sent via PostMessage
+  - This blob version is more arbitrary, it can be constructed with blob parts that isn't a instance of itself
+  it has to look and behave as a blob to be accepted as a blob part.
+    - The benefit of this is that you can create other types of blobs that don't contain any internal data that has to be read in other ways, such as the `BlobDataItem` created in `from.js` that wraps a file path into a blob-like item and read lazily (nodejs plans to [implement this][fs-blobs] as well)
+  - The `blob.stream()` is the most noticeable differences. It returns a WHATWG stream now. to keep it as a node stream you would have to do:
+
+  ```js
+    import {Readable} from 'stream'
+    const stream = Readable.from(blob.stream())
+  ```
+</details>
+
+## Usage
+
+```js
+// Ways to import
+// (PS it's dependency free ESM package so regular http-import from CDN works too)
+import Blob from 'fetch-blob'
+import File from 'fetch-blob/file.js'
+
+import {Blob} from 'fetch-blob'
+import {File} from 'fetch-blob/file.js'
+
+const {Blob} = await import('fetch-blob')
+
+
+// Ways to read the blob:
+const blob = new Blob(['hello, world'])
+
+await blob.text()
+await blob.arrayBuffer()
+for await (let chunk of  blob.stream()) { ... }
+blob.stream().getReader().read()
+blob.stream().getReader({mode: 'byob'}).read(view)
+```
+
+### Blob part backed up by filesystem
+
+`fetch-blob/from.js` comes packed with tools to convert any filepath into either a Blob or a File
+It will not read the content into memory. It will only stat the file for last modified date and file size.
+
+```js
+// The default export is sync and use fs.stat to retrieve size & last modified as a blob
+import blobFromSync from 'fetch-blob/from.js'
+import {File, Blob, blobFrom, blobFromSync, fileFrom, fileFromSync} from 'fetch-blob/from.js'
+
+const fsFile = fileFromSync('./2-GiB-file.bin', 'application/octet-stream')
+const fsBlob = await blobFrom('./2-GiB-file.mp4')
+
+// Not a 4 GiB memory snapshot, just holds references
+// points to where data is located on the disk
+const blob = new Blob([fsFile, fsBlob, 'memory', new Uint8Array(10)])
+console.log(blob.size) // ~4 GiB
+```
+
+`blobFrom|blobFromSync|fileFrom|fileFromSync(path, [mimetype])`
+
+### Creating Blobs backed up by other async sources
+Our Blob & File class are more generic then any other polyfills in the way that it can accept any blob look-a-like item
+An example of this is that our blob implementation can be constructed with parts coming from [BlobDataItem](https://github.com/node-fetch/fetch-blob/blob/8ef89adad40d255a3bbd55cf38b88597c1cd5480/from.js#L32) (aka a filepath) or from [buffer.Blob](https://nodejs.org/api/buffer.html#buffer_new_buffer_blob_sources_options), It dose not have to implement all the methods - just enough that it can be read/understood by our Blob implementation. The minium requirements is that it has `Symbol.toStringTag`, `size`, `slice()` and either a `stream()` or a `arrayBuffer()` method. If you then wrap it in our Blob or File `new Blob([blobDataItem])` then you get all of the other methods that should be implemented in a blob or file
+
+An example of this could be to create a file or blob like item coming from a remote HTTP request. Or from a DataBase
+
+See the [MDN documentation](https://developer.mozilla.org/en-US/docs/Web/API/Blob) and [tests](https://github.com/node-fetch/fetch-blob/blob/master/test.js) for more details of how to use the Blob.
+
+[npm-image]: https://flat.badgen.net/npm/v/fetch-blob
+[npm-url]: https://www.npmjs.com/package/fetch-blob
+[ci-image]: https://github.com/node-fetch/fetch-blob/workflows/CI/badge.svg
+[ci-url]: https://github.com/node-fetch/fetch-blob/actions
+[codecov-image]: https://flat.badgen.net/codecov/c/github/node-fetch/fetch-blob/master
+[codecov-url]: https://codecov.io/gh/node-fetch/fetch-blob
+[install-size-image]: https://flat.badgen.net/packagephobia/install/fetch-blob
+[install-size-url]: https://packagephobia.now.sh/result?p=fetch-blob
+[fs-blobs]: https://github.com/nodejs/node/issues/37340
diff --git a/node_modules/fetch-blob/file.d.ts b/node_modules/fetch-blob/file.d.ts
new file mode 100644
index 0000000..d4b89bc
--- /dev/null
+++ b/node_modules/fetch-blob/file.d.ts
@@ -0,0 +1,2 @@
+/** @type {typeof globalThis.File} */ export const File: typeof globalThis.File;
+export default File;
diff --git a/node_modules/fetch-blob/file.js b/node_modules/fetch-blob/file.js
new file mode 100644
index 0000000..7b26538
--- /dev/null
+++ b/node_modules/fetch-blob/file.js
@@ -0,0 +1,49 @@
+import Blob from './index.js'
+
+const _File = class File extends Blob {
+  #lastModified = 0
+  #name = ''
+
+  /**
+   * @param {*[]} fileBits
+   * @param {string} fileName
+   * @param {{lastModified?: number, type?: string}} options
+   */// @ts-ignore
+  constructor (fileBits, fileName, options = {}) {
+    if (arguments.length < 2) {
+      throw new TypeError(`Failed to construct 'File': 2 arguments required, but only ${arguments.length} present.`)
+    }
+    super(fileBits, options)
+
+    if (options === null) options = {}
+
+    // Simulate WebIDL type casting for NaN value in lastModified option.
+    const lastModified = options.lastModified === undefined ? Date.now() : Number(options.lastModified)
+    if (!Number.isNaN(lastModified)) {
+      this.#lastModified = lastModified
+    }
+
+    this.#name = String(fileName)
+  }
+
+  get name () {
+    return this.#name
+  }
+
+  get lastModified () {
+    return this.#lastModified
+  }
+
+  get [Symbol.toStringTag] () {
+    return 'File'
+  }
+
+  static [Symbol.hasInstance] (object) {
+    return !!object && object instanceof Blob &&
+      /^(File)$/.test(object[Symbol.toStringTag])
+  }
+}
+
+/** @type {typeof globalThis.File} */// @ts-ignore
+export const File = _File
+export default File
diff --git a/node_modules/fetch-blob/from.d.ts b/node_modules/fetch-blob/from.d.ts
new file mode 100644
index 0000000..530b99b
--- /dev/null
+++ b/node_modules/fetch-blob/from.d.ts
@@ -0,0 +1,26 @@
+export default blobFromSync;
+/**
+ * @param {string} path filepath on the disk
+ * @param {string} [type] mimetype to use
+ */
+export function blobFromSync(path: string, type?: string): Blob;
+import File from "./file.js";
+import Blob from "./index.js";
+/**
+ * @param {string} path filepath on the disk
+ * @param {string} [type] mimetype to use
+ * @returns {Promise<Blob>}
+ */
+export function blobFrom(path: string, type?: string): Promise<Blob>;
+/**
+ * @param {string} path filepath on the disk
+ * @param {string} [type] mimetype to use
+ * @returns {Promise<File>}
+ */
+export function fileFrom(path: string, type?: string): Promise<File>;
+/**
+ * @param {string} path filepath on the disk
+ * @param {string} [type] mimetype to use
+ */
+export function fileFromSync(path: string, type?: string): File;
+export { File, Blob };
diff --git a/node_modules/fetch-blob/from.js b/node_modules/fetch-blob/from.js
new file mode 100644
index 0000000..9eaf8bf
--- /dev/null
+++ b/node_modules/fetch-blob/from.js
@@ -0,0 +1,100 @@
+import { statSync, createReadStream, promises as fs } from 'node:fs'
+import { basename } from 'node:path'
+import DOMException from 'node-domexception'
+
+import File from './file.js'
+import Blob from './index.js'
+
+const { stat } = fs
+
+/**
+ * @param {string} path filepath on the disk
+ * @param {string} [type] mimetype to use
+ */
+const blobFromSync = (path, type) => fromBlob(statSync(path), path, type)
+
+/**
+ * @param {string} path filepath on the disk
+ * @param {string} [type] mimetype to use
+ * @returns {Promise<Blob>}
+ */
+const blobFrom = (path, type) => stat(path).then(stat => fromBlob(stat, path, type))
+
+/**
+ * @param {string} path filepath on the disk
+ * @param {string} [type] mimetype to use
+ * @returns {Promise<File>}
+ */
+const fileFrom = (path, type) => stat(path).then(stat => fromFile(stat, path, type))
+
+/**
+ * @param {string} path filepath on the disk
+ * @param {string} [type] mimetype to use
+ */
+const fileFromSync = (path, type) => fromFile(statSync(path), path, type)
+
+// @ts-ignore
+const fromBlob = (stat, path, type = '') => new Blob([new BlobDataItem({
+  path,
+  size: stat.size,
+  lastModified: stat.mtimeMs,
+  start: 0
+})], { type })
+
+// @ts-ignore
+const fromFile = (stat, path, type = '') => new File([new BlobDataItem({
+  path,
+  size: stat.size,
+  lastModified: stat.mtimeMs,
+  start: 0
+})], basename(path), { type, lastModified: stat.mtimeMs })
+
+/**
+ * This is a blob backed up by a file on the disk
+ * with minium requirement. Its wrapped around a Blob as a blobPart
+ * so you have no direct access to this.
+ *
+ * @private
+ */
+class BlobDataItem {
+  #path
+  #start
+
+  constructor (options) {
+    this.#path = options.path
+    this.#start = options.start
+    this.size = options.size
+    this.lastModified = options.lastModified
+  }
+
+  /**
+   * Slicing arguments is first validated and formatted
+   * to not be out of range by Blob.prototype.slice
+   */
+  slice (start, end) {
+    return new BlobDataItem({
+      path: this.#path,
+      lastModified: this.lastModified,
+      size: end - start,
+      start: this.#start + start
+    })
+  }
+
+  async * stream () {
+    const { mtimeMs } = await stat(this.#path)
+    if (mtimeMs > this.lastModified) {
+      throw new DOMException('The requested file could not be read, typically due to permission problems that have occurred after a reference to a file was acquired.', 'NotReadableError')
+    }
+    yield * createReadStream(this.#path, {
+      start: this.#start,
+      end: this.#start + this.size - 1
+    })
+  }
+
+  get [Symbol.toStringTag] () {
+    return 'Blob'
+  }
+}
+
+export default blobFromSync
+export { File, Blob, blobFrom, blobFromSync, fileFrom, fileFromSync }
diff --git a/node_modules/fetch-blob/index.d.ts b/node_modules/fetch-blob/index.d.ts
new file mode 100644
index 0000000..7a68957
--- /dev/null
+++ b/node_modules/fetch-blob/index.d.ts
@@ -0,0 +1,3 @@
+/** @type {typeof globalThis.Blob} */
+export const Blob: typeof globalThis.Blob;
+export default Blob;
diff --git a/node_modules/fetch-blob/index.js b/node_modules/fetch-blob/index.js
new file mode 100644
index 0000000..2542ac2
--- /dev/null
+++ b/node_modules/fetch-blob/index.js
@@ -0,0 +1,250 @@
+/*! fetch-blob. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
+
+// TODO (jimmywarting): in the feature use conditional loading with top level await (requires 14.x)
+// Node has recently added whatwg stream into core
+
+import './streams.cjs'
+
+// 64 KiB (same size chrome slice theirs blob into Uint8array's)
+const POOL_SIZE = 65536
+
+/** @param {(Blob | Uint8Array)[]} parts */
+async function * toIterator (parts, clone = true) {
+  for (const part of parts) {
+    if ('stream' in part) {
+      yield * (/** @type {AsyncIterableIterator<Uint8Array>} */ (part.stream()))
+    } else if (ArrayBuffer.isView(part)) {
+      if (clone) {
+        let position = part.byteOffset
+        const end = part.byteOffset + part.byteLength
+        while (position !== end) {
+          const size = Math.min(end - position, POOL_SIZE)
+          const chunk = part.buffer.slice(position, position + size)
+          position += chunk.byteLength
+          yield new Uint8Array(chunk)
+        }
+      } else {
+        yield part
+      }
+    /* c8 ignore next 10 */
+    } else {
+      // For blobs that have arrayBuffer but no stream method (nodes buffer.Blob)
+      let position = 0, b = (/** @type {Blob} */ (part))
+      while (position !== b.size) {
+        const chunk = b.slice(position, Math.min(b.size, position + POOL_SIZE))
+        const buffer = await chunk.arrayBuffer()
+        position += buffer.byteLength
+        yield new Uint8Array(buffer)
+      }
+    }
+  }
+}
+
+const _Blob = class Blob {
+  /** @type {Array.<(Blob|Uint8Array)>} */
+  #parts = []
+  #type = ''
+  #size = 0
+  #endings = 'transparent'
+
+  /**
+   * The Blob() constructor returns a new Blob object. The content
+   * of the blob consists of the concatenation of the values given
+   * in the parameter array.
+   *
+   * @param {*} blobParts
+   * @param {{ type?: string, endings?: string }} [options]
+   */
+  constructor (blobParts = [], options = {}) {
+    if (typeof blobParts !== 'object' || blobParts === null) {
+      throw new TypeError('Failed to construct \'Blob\': The provided value cannot be converted to a sequence.')
+    }
+
+    if (typeof blobParts[Symbol.iterator] !== 'function') {
+      throw new TypeError('Failed to construct \'Blob\': The object must have a callable @@iterator property.')
+    }
+
+    if (typeof options !== 'object' && typeof options !== 'function') {
+      throw new TypeError('Failed to construct \'Blob\': parameter 2 cannot convert to dictionary.')
+    }
+
+    if (options === null) options = {}
+
+    const encoder = new TextEncoder()
+    for (const element of blobParts) {
+      let part
+      if (ArrayBuffer.isView(element)) {
+        part = new Uint8Array(element.buffer.slice(element.byteOffset, element.byteOffset + element.byteLength))
+      } else if (element instanceof ArrayBuffer) {
+        part = new Uint8Array(element.slice(0))
+      } else if (element instanceof Blob) {
+        part = element
+      } else {
+        part = encoder.encode(`${element}`)
+      }
+
+      this.#size += ArrayBuffer.isView(part) ? part.byteLength : part.size
+      this.#parts.push(part)
+    }
+
+    this.#endings = `${options.endings === undefined ? 'transparent' : options.endings}`
+    const type = options.type === undefined ? '' : String(options.type)
+    this.#type = /^[\x20-\x7E]*$/.test(type) ? type : ''
+  }
+
+  /**
+   * The Blob interface's size property returns the
+   * size of the Blob in bytes.
+   */
+  get size () {
+    return this.#size
+  }
+
+  /**
+   * The type property of a Blob object returns the MIME type of the file.
+   */
+  get type () {
+    return this.#type
+  }
+
+  /**
+   * The text() method in the Blob interface returns a Promise
+   * that resolves with a string containing the contents of
+   * the blob, interpreted as UTF-8.
+   *
+   * @return {Promise<string>}
+   */
+  async text () {
+    // More optimized than using this.arrayBuffer()
+    // that requires twice as much ram
+    const decoder = new TextDecoder()
+    let str = ''
+    for await (const part of toIterator(this.#parts, false)) {
+      str += decoder.decode(part, { stream: true })
+    }
+    // Remaining
+    str += decoder.decode()
+    return str
+  }
+
+  /**
+   * The arrayBuffer() method in the Blob interface returns a
+   * Promise that resolves with the contents of the blob as
+   * binary data contained in an ArrayBuffer.
+   *
+   * @return {Promise<ArrayBuffer>}
+   */
+  async arrayBuffer () {
+    // Easier way... Just a unnecessary overhead
+    // const view = new Uint8Array(this.size);
+    // await this.stream().getReader({mode: 'byob'}).read(view);
+    // return view.buffer;
+
+    const data = new Uint8Array(this.size)
+    let offset = 0
+    for await (const chunk of toIterator(this.#parts, false)) {
+      data.set(chunk, offset)
+      offset += chunk.length
+    }
+
+    return data.buffer
+  }
+
+  stream () {
+    const it = toIterator(this.#parts, true)
+
+    return new globalThis.ReadableStream({
+      // @ts-ignore
+      type: 'bytes',
+      async pull (ctrl) {
+        const chunk = await it.next()
+        chunk.done ? ctrl.close() : ctrl.enqueue(chunk.value)
+      },
+
+      async cancel () {
+        await it.return()
+      }
+    })
+  }
+
+  /**
+   * The Blob interface's slice() method creates and returns a
+   * new Blob object which contains data from a subset of the
+   * blob on which it's called.
+   *
+   * @param {number} [start]
+   * @param {number} [end]
+   * @param {string} [type]
+   */
+  slice (start = 0, end = this.size, type = '') {
+    const { size } = this
+
+    let relativeStart = start < 0 ? Math.max(size + start, 0) : Math.min(start, size)
+    let relativeEnd = end < 0 ? Math.max(size + end, 0) : Math.min(end, size)
+
+    const span = Math.max(relativeEnd - relativeStart, 0)
+    const parts = this.#parts
+    const blobParts = []
+    let added = 0
+
+    for (const part of parts) {
+      // don't add the overflow to new blobParts
+      if (added >= span) {
+        break
+      }
+
+      const size = ArrayBuffer.isView(part) ? part.byteLength : part.size
+      if (relativeStart && size <= relativeStart) {
+        // Skip the beginning and change the relative
+        // start & end position as we skip the unwanted parts
+        relativeStart -= size
+        relativeEnd -= size
+      } else {
+        let chunk
+        if (ArrayBuffer.isView(part)) {
+          chunk = part.subarray(relativeStart, Math.min(size, relativeEnd))
+          added += chunk.byteLength
+        } else {
+          chunk = part.slice(relativeStart, Math.min(size, relativeEnd))
+          added += chunk.size
+        }
+        relativeEnd -= size
+        blobParts.push(chunk)
+        relativeStart = 0 // All next sequential parts should start at 0
+      }
+    }
+
+    const blob = new Blob([], { type: String(type).toLowerCase() })
+    blob.#size = span
+    blob.#parts = blobParts
+
+    return blob
+  }
+
+  get [Symbol.toStringTag] () {
+    return 'Blob'
+  }
+
+  static [Symbol.hasInstance] (object) {
+    return (
+      object &&
+      typeof object === 'object' &&
+      typeof object.constructor === 'function' &&
+      (
+        typeof object.stream === 'function' ||
+        typeof object.arrayBuffer === 'function'
+      ) &&
+      /^(Blob|File)$/.test(object[Symbol.toStringTag])
+    )
+  }
+}
+
+Object.defineProperties(_Blob.prototype, {
+  size: { enumerable: true },
+  type: { enumerable: true },
+  slice: { enumerable: true }
+})
+
+/** @type {typeof globalThis.Blob} */
+export const Blob = _Blob
+export default Blob
diff --git a/node_modules/fetch-blob/package.json b/node_modules/fetch-blob/package.json
new file mode 100644
index 0000000..9d07f39
--- /dev/null
+++ b/node_modules/fetch-blob/package.json
@@ -0,0 +1,56 @@
+{
+    "name": "fetch-blob",
+    "version": "3.2.0",
+    "description": "Blob & File implementation in Node.js, originally from node-fetch.",
+    "main": "index.js",
+    "type": "module",
+    "files": [
+        "from.js",
+        "file.js",
+        "file.d.ts",
+        "index.js",
+        "index.d.ts",
+        "from.d.ts",
+        "streams.cjs"
+    ],
+    "scripts": {
+        "test": "node --experimental-loader ./test/http-loader.js ./test/test-wpt-in-node.js",
+        "report": "c8 --reporter json --reporter text npm run test",
+        "coverage": "npm run report && codecov -f coverage/coverage-final.json",
+        "prepublishOnly": "tsc --declaration --emitDeclarationOnly --allowJs index.js from.js"
+    },
+    "repository": "https://github.com/node-fetch/fetch-blob.git",
+    "keywords": [
+        "blob",
+        "file",
+        "node-fetch"
+    ],
+    "engines": {
+        "node": "^12.20 || >= 14.13"
+    },
+    "author": "Jimmy Wärting <jimmy@warting.se> (https://jimmy.warting.se)",
+    "license": "MIT",
+    "bugs": {
+        "url": "https://github.com/node-fetch/fetch-blob/issues"
+    },
+    "homepage": "https://github.com/node-fetch/fetch-blob#readme",
+    "devDependencies": {
+        "@types/node": "^17.0.9",
+        "c8": "^7.11.0",
+        "typescript": "^4.5.4"
+    },
+    "funding": [
+        {
+            "type": "github",
+            "url": "https://github.com/sponsors/jimmywarting"
+        },
+        {
+            "type": "paypal",
+            "url": "https://paypal.me/jimmywarting"
+        }
+    ],
+    "dependencies": {
+        "node-domexception": "^1.0.0",
+        "web-streams-polyfill": "^3.0.3"
+    }
+}
diff --git a/node_modules/fetch-blob/streams.cjs b/node_modules/fetch-blob/streams.cjs
new file mode 100644
index 0000000..f760959
--- /dev/null
+++ b/node_modules/fetch-blob/streams.cjs
@@ -0,0 +1,51 @@
+/* c8 ignore start */
+// 64 KiB (same size chrome slice theirs blob into Uint8array's)
+const POOL_SIZE = 65536
+
+if (!globalThis.ReadableStream) {
+  // `node:stream/web` got introduced in v16.5.0 as experimental
+  // and it's preferred over the polyfilled version. So we also
+  // suppress the warning that gets emitted by NodeJS for using it.
+  try {
+    const process = require('node:process')
+    const { emitWarning } = process
+    try {
+      process.emitWarning = () => {}
+      Object.assign(globalThis, require('node:stream/web'))
+      process.emitWarning = emitWarning
+    } catch (error) {
+      process.emitWarning = emitWarning
+      throw error
+    }
+  } catch (error) {
+    // fallback to polyfill implementation
+    Object.assign(globalThis, require('web-streams-polyfill/dist/ponyfill.es2018.js'))
+  }
+}
+
+try {
+  // Don't use node: prefix for this, require+node: is not supported until node v14.14
+  // Only `import()` can use prefix in 12.20 and later
+  const { Blob } = require('buffer')
+  if (Blob && !Blob.prototype.stream) {
+    Blob.prototype.stream = function name (params) {
+      let position = 0
+      const blob = this
+
+      return new ReadableStream({
+        type: 'bytes',
+        async pull (ctrl) {
+          const chunk = blob.slice(position, Math.min(blob.size, position + POOL_SIZE))
+          const buffer = await chunk.arrayBuffer()
+          position += buffer.byteLength
+          ctrl.enqueue(new Uint8Array(buffer))
+
+          if (position === blob.size) {
+            ctrl.close()
+          }
+        }
+      })
+    }
+  }
+} catch (error) {}
+/* c8 ignore end */
diff --git a/node_modules/formdata-polyfill/FormData.js b/node_modules/formdata-polyfill/FormData.js
new file mode 100644
index 0000000..8e73660
--- /dev/null
+++ b/node_modules/formdata-polyfill/FormData.js
@@ -0,0 +1,441 @@
+/* formdata-polyfill. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
+
+/* global FormData self Blob File */
+/* eslint-disable no-inner-declarations */
+
+if (typeof Blob !== 'undefined' && (typeof FormData === 'undefined' || !FormData.prototype.keys)) {
+  const global = typeof globalThis === 'object'
+    ? globalThis
+    : typeof window === 'object'
+      ? window
+      : typeof self === 'object' ? self : this
+
+  // keep a reference to native implementation
+  const _FormData = global.FormData
+
+  // To be monkey patched
+  const _send = global.XMLHttpRequest && global.XMLHttpRequest.prototype.send
+  const _fetch = global.Request && global.fetch
+  const _sendBeacon = global.navigator && global.navigator.sendBeacon
+  // Might be a worker thread...
+  const _match = global.Element && global.Element.prototype
+
+  // Unable to patch Request/Response constructor correctly #109
+  // only way is to use ES6 class extend
+  // https://github.com/babel/babel/issues/1966
+
+  const stringTag = global.Symbol && Symbol.toStringTag
+
+  // Add missing stringTags to blob and files
+  if (stringTag) {
+    if (!Blob.prototype[stringTag]) {
+      Blob.prototype[stringTag] = 'Blob'
+    }
+
+    if ('File' in global && !File.prototype[stringTag]) {
+      File.prototype[stringTag] = 'File'
+    }
+  }
+
+  // Fix so you can construct your own File
+  try {
+    new File([], '') // eslint-disable-line
+  } catch (a) {
+    global.File = function File (b, d, c) {
+      const blob = new Blob(b, c || {})
+      const t = c && void 0 !== c.lastModified ? new Date(c.lastModified) : new Date()
+
+      Object.defineProperties(blob, {
+        name: {
+          value: d
+        },
+        lastModified: {
+          value: +t
+        },
+        toString: {
+          value () {
+            return '[object File]'
+          }
+        }
+      })
+
+      if (stringTag) {
+        Object.defineProperty(blob, stringTag, {
+          value: 'File'
+        })
+      }
+
+      return blob
+    }
+  }
+
+  function ensureArgs (args, expected) {
+    if (args.length < expected) {
+      throw new TypeError(`${expected} argument required, but only ${args.length} present.`)
+    }
+  }
+
+  /**
+   * @param {string} name
+   * @param {string | undefined} filename
+   * @returns {[string, File|string]}
+   */
+  function normalizeArgs (name, value, filename) {
+    if (value instanceof Blob) {
+      filename = filename !== undefined
+      ? String(filename + '')
+      : typeof value.name === 'string'
+      ? value.name
+      : 'blob'
+
+      if (value.name !== filename || Object.prototype.toString.call(value) === '[object Blob]') {
+        value = new File([value], filename)
+      }
+      return [String(name), value]
+    }
+    return [String(name), String(value)]
+  }
+
+  // normalize line feeds for textarea
+  // https://html.spec.whatwg.org/multipage/form-elements.html#textarea-line-break-normalisation-transformation
+  function normalizeLinefeeds (value) {
+    return value.replace(/\r?\n|\r/g, '\r\n')
+  }
+
+  /**
+   * @template T
+   * @param {ArrayLike<T>} arr
+   * @param {{ (elm: T): void; }} cb
+   */
+  function each (arr, cb) {
+    for (let i = 0; i < arr.length; i++) {
+      cb(arr[i])
+    }
+  }
+
+  const escape = str => str.replace(/\n/g, '%0A').replace(/\r/g, '%0D').replace(/"/g, '%22')
+
+  /**
+   * @implements {Iterable}
+   */
+  class FormDataPolyfill {
+    /**
+     * FormData class
+     *
+     * @param {HTMLFormElement=} form
+     */
+    constructor (form) {
+      /** @type {[string, string|File][]} */
+      this._data = []
+
+      const self = this
+      form && each(form.elements, (/** @type {HTMLInputElement} */ elm) => {
+        if (
+          !elm.name ||
+          elm.disabled ||
+          elm.type === 'submit' ||
+          elm.type === 'button' ||
+          elm.matches('form fieldset[disabled] *')
+        ) return
+
+        if (elm.type === 'file') {
+          const files = elm.files && elm.files.length
+            ? elm.files
+            : [new File([], '', { type: 'application/octet-stream' })] // #78
+
+          each(files, file => {
+            self.append(elm.name, file)
+          })
+        } else if (elm.type === 'select-multiple' || elm.type === 'select-one') {
+          each(elm.options, opt => {
+            !opt.disabled && opt.selected && self.append(elm.name, opt.value)
+          })
+        } else if (elm.type === 'checkbox' || elm.type === 'radio') {
+          if (elm.checked) self.append(elm.name, elm.value)
+        } else {
+          const value = elm.type === 'textarea' ? normalizeLinefeeds(elm.value) : elm.value
+          self.append(elm.name, value)
+        }
+      })
+    }
+
+    /**
+     * Append a field
+     *
+     * @param   {string}           name      field name
+     * @param   {string|Blob|File} value     string / blob / file
+     * @param   {string=}          filename  filename to use with blob
+     * @return  {undefined}
+     */
+    append (name, value, filename) {
+      ensureArgs(arguments, 2)
+      this._data.push(normalizeArgs(name, value, filename))
+    }
+
+    /**
+     * Delete all fields values given name
+     *
+     * @param   {string}  name  Field name
+     * @return  {undefined}
+     */
+    delete (name) {
+      ensureArgs(arguments, 1)
+      const result = []
+      name = String(name)
+
+      each(this._data, entry => {
+        entry[0] !== name && result.push(entry)
+      })
+
+      this._data = result
+    }
+
+    /**
+     * Iterate over all fields as [name, value]
+     *
+     * @return {Iterator}
+     */
+    * entries () {
+      for (var i = 0; i < this._data.length; i++) {
+        yield this._data[i]
+      }
+    }
+
+    /**
+     * Iterate over all fields
+     *
+     * @param   {Function}  callback  Executed for each item with parameters (value, name, thisArg)
+     * @param   {Object=}   thisArg   `this` context for callback function
+     */
+    forEach (callback, thisArg) {
+      ensureArgs(arguments, 1)
+      for (const [name, value] of this) {
+        callback.call(thisArg, value, name, this)
+      }
+    }
+
+    /**
+     * Return first field value given name
+     * or null if non existent
+     *
+     * @param   {string}  name      Field name
+     * @return  {string|File|null}  value Fields value
+     */
+    get (name) {
+      ensureArgs(arguments, 1)
+      const entries = this._data
+      name = String(name)
+      for (let i = 0; i < entries.length; i++) {
+        if (entries[i][0] === name) {
+          return entries[i][1]
+        }
+      }
+      return null
+    }
+
+    /**
+     * Return all fields values given name
+     *
+     * @param   {string}  name  Fields name
+     * @return  {Array}         [{String|File}]
+     */
+    getAll (name) {
+      ensureArgs(arguments, 1)
+      const result = []
+      name = String(name)
+      each(this._data, data => {
+        data[0] === name && result.push(data[1])
+      })
+
+      return result
+    }
+
+    /**
+     * Check for field name existence
+     *
+     * @param   {string}   name  Field name
+     * @return  {boolean}
+     */
+    has (name) {
+      ensureArgs(arguments, 1)
+      name = String(name)
+      for (let i = 0; i < this._data.length; i++) {
+        if (this._data[i][0] === name) {
+          return true
+        }
+      }
+      return false
+    }
+
+    /**
+     * Iterate over all fields name
+     *
+     * @return {Iterator}
+     */
+    * keys () {
+      for (const [name] of this) {
+        yield name
+      }
+    }
+
+    /**
+     * Overwrite all values given name
+     *
+     * @param   {string}    name      Filed name
+     * @param   {string}    value     Field value
+     * @param   {string=}   filename  Filename (optional)
+     */
+    set (name, value, filename) {
+      ensureArgs(arguments, 2)
+      name = String(name)
+      /** @type {[string, string|File][]} */
+      const result = []
+      const args = normalizeArgs(name, value, filename)
+      let replace = true
+
+      // - replace the first occurrence with same name
+      // - discards the remaining with same name
+      // - while keeping the same order items where added
+      each(this._data, data => {
+        data[0] === name
+          ? replace && (replace = !result.push(args))
+          : result.push(data)
+      })
+
+      replace && result.push(args)
+
+      this._data = result
+    }
+
+    /**
+     * Iterate over all fields
+     *
+     * @return {Iterator}
+     */
+    * values () {
+      for (const [, value] of this) {
+        yield value
+      }
+    }
+
+    /**
+     * Return a native (perhaps degraded) FormData with only a `append` method
+     * Can throw if it's not supported
+     *
+     * @return {FormData}
+     */
+    ['_asNative'] () {
+      const fd = new _FormData()
+
+      for (const [name, value] of this) {
+        fd.append(name, value)
+      }
+
+      return fd
+    }
+
+    /**
+     * [_blob description]
+     *
+     * @return {Blob} [description]
+     */
+    ['_blob'] () {
+        const boundary = '----formdata-polyfill-' + Math.random(),
+          chunks = [],
+          p = `--${boundary}\r\nContent-Disposition: form-data; name="`
+        this.forEach((value, name) => typeof value == 'string'
+          ? chunks.push(p + escape(normalizeLinefeeds(name)) + `"\r\n\r\n${normalizeLinefeeds(value)}\r\n`)
+          : chunks.push(p + escape(normalizeLinefeeds(name)) + `"; filename="${escape(value.name)}"\r\nContent-Type: ${value.type||"application/octet-stream"}\r\n\r\n`, value, `\r\n`))
+        chunks.push(`--${boundary}--`)
+        return new Blob(chunks, {
+          type: "multipart/form-data; boundary=" + boundary
+        })
+    }
+
+    /**
+     * The class itself is iterable
+     * alias for formdata.entries()
+     *
+     * @return {Iterator}
+     */
+    [Symbol.iterator] () {
+      return this.entries()
+    }
+
+    /**
+     * Create the default string description.
+     *
+     * @return  {string} [object FormData]
+     */
+    toString () {
+      return '[object FormData]'
+    }
+  }
+
+  if (_match && !_match.matches) {
+    _match.matches =
+      _match.matchesSelector ||
+      _match.mozMatchesSelector ||
+      _match.msMatchesSelector ||
+      _match.oMatchesSelector ||
+      _match.webkitMatchesSelector ||
+      function (s) {
+        var matches = (this.document || this.ownerDocument).querySelectorAll(s)
+        var i = matches.length
+        while (--i >= 0 && matches.item(i) !== this) {}
+        return i > -1
+      }
+  }
+
+  if (stringTag) {
+    /**
+     * Create the default string description.
+     * It is accessed internally by the Object.prototype.toString().
+     */
+    FormDataPolyfill.prototype[stringTag] = 'FormData'
+  }
+
+  // Patch xhr's send method to call _blob transparently
+  if (_send) {
+    const setRequestHeader = global.XMLHttpRequest.prototype.setRequestHeader
+
+    global.XMLHttpRequest.prototype.setRequestHeader = function (name, value) {
+      setRequestHeader.call(this, name, value)
+      if (name.toLowerCase() === 'content-type') this._hasContentType = true
+    }
+
+    global.XMLHttpRequest.prototype.send = function (data) {
+      // need to patch send b/c old IE don't send blob's type (#44)
+      if (data instanceof FormDataPolyfill) {
+        const blob = data['_blob']()
+        if (!this._hasContentType) this.setRequestHeader('Content-Type', blob.type)
+        _send.call(this, blob)
+      } else {
+        _send.call(this, data)
+      }
+    }
+  }
+
+  // Patch fetch's function to call _blob transparently
+  if (_fetch) {
+    global.fetch = function (input, init) {
+      if (init && init.body && init.body instanceof FormDataPolyfill) {
+        init.body = init.body['_blob']()
+      }
+
+      return _fetch.call(this, input, init)
+    }
+  }
+
+  // Patch navigator.sendBeacon to use native FormData
+  if (_sendBeacon) {
+    global.navigator.sendBeacon = function (url, data) {
+      if (data instanceof FormDataPolyfill) {
+        data = data['_asNative']()
+      }
+      return _sendBeacon.call(this, url, data)
+    }
+  }
+
+  global['FormData'] = FormDataPolyfill
+}
diff --git a/node_modules/formdata-polyfill/LICENSE b/node_modules/formdata-polyfill/LICENSE
new file mode 100644
index 0000000..fd0f555
--- /dev/null
+++ b/node_modules/formdata-polyfill/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2016 Jimmy Karl Roland Wärting
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/node_modules/formdata-polyfill/README.md b/node_modules/formdata-polyfill/README.md
new file mode 100644
index 0000000..8355299
--- /dev/null
+++ b/node_modules/formdata-polyfill/README.md
@@ -0,0 +1,145 @@
+### A `FormData` polyfill for the browser ...and a module for NodeJS (`New!`)
+
+```bash
+npm install formdata-polyfill
+```
+
+The browser polyfill will likely have done its part already, and i hope you stop supporting old browsers c",)<br>
+But NodeJS still laks a proper FormData<br>The good old form-data package is a very old and isn't spec compatible and dose some abnormal stuff to construct and read FormData instances that other http libraries are not happy about when it comes to follow the spec.
+
+### The NodeJS / ESM version
+- The modular (~2.3 KiB minified uncompressed) version of this package is independent of any browser stuff and don't patch anything
+- It's as pure/spec compatible as it possible gets the test are run by WPT.
+- It's compatible with [node-fetch](https://github.com/node-fetch/node-fetch).
+- It have higher platform dependencies as it uses classes, symbols, ESM & private fields
+- Only dependency it has is [fetch-blob](https://github.com/node-fetch/fetch-blob)
+
+```js
+// Node example
+import fetch from 'node-fetch'
+import File from 'fetch-blob/file.js'
+import { fileFromSync } from 'fetch-blob/from.js'
+import { FormData } from 'formdata-polyfill/esm.min.js'
+
+const file = fileFromSync('./README.md')
+const fd = new FormData()
+
+fd.append('file-upload', new File(['abc'], 'hello-world.txt'))
+fd.append('file-upload', file)
+
+// it's also possible to append file/blob look-a-like items
+// if you have streams coming from other destinations
+fd.append('file-upload', {
+  size: 123,
+  type: '',
+  name: 'cat-video.mp4',
+  stream() { return stream },
+  [Symbol.toStringTag]: 'File'
+})
+
+fetch('https://httpbin.org/post', { method: 'POST', body: fd })
+```
+
+----
+
+It also comes with way to convert FormData into Blobs - it's not something that every developer should have to deal with.
+It's mainly for [node-fetch](https://github.com/node-fetch/node-fetch) and other http library to ease the process of serializing a FormData into a blob and just wish to deal with Blobs instead (Both Deno and Undici adapted a version of this [formDataToBlob](https://github.com/jimmywarting/FormData/blob/5ddea9e0de2fc5e246ab1b2f9d404dee0c319c02/formdata-to-blob.js) to the core and passes all WPT tests run by the browser itself)
+```js
+import { Readable } from 'node:stream'
+import { FormData, formDataToBlob } from 'formdata-polyfill/esm.min.js'
+
+const blob = formDataToBlob(new FormData())
+fetch('https://httpbin.org/post', { method: 'POST', body: blob })
+
+// node built in http and other similar http library have to do:
+const stream = Readable.from(blob.stream())
+const req = http.request('http://httpbin.org/post', {
+  method: 'post',
+  headers: {
+    'Content-Length': blob.size,
+    'Content-Type': blob.type
+  }
+})
+stream.pipe(req)
+```
+
+PS: blob & file that are appended to the FormData will not be read until any of the serialized blob read-methods gets called
+...so uploading very large files is no biggie
+
+### Browser polyfill
+
+usage:
+
+```js
+import 'formdata-polyfill' // that's it
+```
+
+The browser polyfill conditionally replaces the native implementation rather than fixing the missing functions,
+since otherwise there is no way to get or delete existing values in the FormData object.
+Therefore this also patches `XMLHttpRequest.prototype.send` and `fetch` to send the `FormData` as a blob,
+and `navigator.sendBeacon` to send native `FormData`.
+
+I was unable to patch the Response/Request constructor
+so if you are constructing them with FormData then you need to call `fd._blob()` manually.
+
+```js
+new Request(url, {
+  method: 'post',
+  body: fd._blob ? fd._blob() : fd
+})
+```
+
+Dependencies
+---
+
+If you need to support IE <= 9 then I recommend you to include eligrey's [blob.js]
+(which i hope you don't - since IE is now dead)
+
+<details>
+    <summary>Updating from 2.x to 3.x</summary>
+
+Previously you had to import the polyfill and use that,
+since it didn't replace the global (existing) FormData implementation.
+But now it transparently calls `_blob()` for you when you are sending something with fetch or XHR,
+by way of monkey-patching the `XMLHttpRequest.prototype.send` and `fetch` functions.
+
+So you maybe had something like this:
+
+```javascript
+var FormData = require('formdata-polyfill')
+var fd = new FormData(form)
+xhr.send(fd._blob())
+```
+
+There is no longer anything exported from the module
+(though you of course still need to import it to install the polyfill),
+so you can now use the FormData object as normal:
+
+```javascript
+require('formdata-polyfill')
+var fd = new FormData(form)
+xhr.send(fd)
+```
+
+</details>
+
+
+
+Native Browser compatibility (as of 2021-05-08)
+---
+Based on this you can decide for yourself if you need this polyfill.
+
+[![screenshot](https://user-images.githubusercontent.com/1148376/117550329-0993aa80-b040-11eb-976c-14e31f1a3ba4.png)](https://developer.mozilla.org/en-US/docs/Web/API/FormData#Browser_compatibility)
+
+
+
+This normalizes support for the FormData API:
+
+ - `append` with filename
+ - `delete()`, `get()`, `getAll()`, `has()`, `set()`
+ - `entries()`, `keys()`, `values()`, and support for `for...of`
+ - Available in web workers (just include the polyfill)
+
+  [npm-image]: https://img.shields.io/npm/v/formdata-polyfill.svg
+  [npm-url]: https://www.npmjs.com/package/formdata-polyfill
+  [blob.js]: https://github.com/eligrey/Blob.js
diff --git a/node_modules/formdata-polyfill/esm.min.d.ts b/node_modules/formdata-polyfill/esm.min.d.ts
new file mode 100644
index 0000000..b45f42e
--- /dev/null
+++ b/node_modules/formdata-polyfill/esm.min.d.ts
@@ -0,0 +1,5 @@
+export declare const FormData: {
+  new (): FormData;
+  prototype: FormData;
+};
+export declare function formDataToBlob(formData: FormData): Blob;
diff --git a/node_modules/formdata-polyfill/esm.min.js b/node_modules/formdata-polyfill/esm.min.js
new file mode 100644
index 0000000..745ca29
--- /dev/null
+++ b/node_modules/formdata-polyfill/esm.min.js
@@ -0,0 +1,40 @@
+/*! formdata-polyfill. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
+
+import C from 'fetch-blob'
+import F from 'fetch-blob/file.js'
+
+var {toStringTag:t,iterator:i,hasInstance:h}=Symbol,
+r=Math.random,
+m='append,set,get,getAll,delete,keys,values,entries,forEach,constructor'.split(','),
+f=(a,b,c)=>(a+='',/^(Blob|File)$/.test(b && b[t])?[(c=c!==void 0?c+'':b[t]=='File'?b.name:'blob',a),b.name!==c||b[t]=='blob'?new F([b],c,b):b]:[a,b+'']),
+e=(c,f)=>(f?c:c.replace(/\r?\n|\r/g,'\r\n')).replace(/\n/g,'%0A').replace(/\r/g,'%0D').replace(/"/g,'%22'),
+x=(n, a, e)=>{if(a.length<e){throw new TypeError(`Failed to execute '${n}' on 'FormData': ${e} arguments required, but only ${a.length} present.`)}}
+
+export const File = F
+
+/** @type {typeof globalThis.FormData} */
+export const FormData = class FormData {
+#d=[];
+constructor(...a){if(a.length)throw new TypeError(`Failed to construct 'FormData': parameter 1 is not of type 'HTMLFormElement'.`)}
+get [t]() {return 'FormData'}
+[i](){return this.entries()}
+static [h](o) {return o&&typeof o==='object'&&o[t]==='FormData'&&!m.some(m=>typeof o[m]!='function')}
+append(...a){x('append',arguments,2);this.#d.push(f(...a))}
+delete(a){x('delete',arguments,1);a+='';this.#d=this.#d.filter(([b])=>b!==a)}
+get(a){x('get',arguments,1);a+='';for(var b=this.#d,l=b.length,c=0;c<l;c++)if(b[c][0]===a)return b[c][1];return null}
+getAll(a,b){x('getAll',arguments,1);b=[];a+='';this.#d.forEach(c=>c[0]===a&&b.push(c[1]));return b}
+has(a){x('has',arguments,1);a+='';return this.#d.some(b=>b[0]===a)}
+forEach(a,b){x('forEach',arguments,1);for(var [c,d]of this)a.call(b,d,c,this)}
+set(...a){x('set',arguments,2);var b=[],c=!0;a=f(...a);this.#d.forEach(d=>{d[0]===a[0]?c&&(c=!b.push(a)):b.push(d)});c&&b.push(a);this.#d=b}
+*entries(){yield*this.#d}
+*keys(){for(var[a]of this)yield a}
+*values(){for(var[,a]of this)yield a}}
+
+/** @param {FormData} F */
+export function formDataToBlob (F,B=C){
+var b=`${r()}${r()}`.replace(/\./g, '').slice(-28).padStart(32, '-'),c=[],p=`--${b}\r\nContent-Disposition: form-data; name="`
+F.forEach((v,n)=>typeof v=='string'
+?c.push(p+e(n)+`"\r\n\r\n${v.replace(/\r(?!\n)|(?<!\r)\n/g, '\r\n')}\r\n`)
+:c.push(p+e(n)+`"; filename="${e(v.name, 1)}"\r\nContent-Type: ${v.type||"application/octet-stream"}\r\n\r\n`, v, '\r\n'))
+c.push(`--${b}--`)
+return new B(c,{type:"multipart/form-data; boundary="+b})}
diff --git a/node_modules/formdata-polyfill/formdata-to-blob.js b/node_modules/formdata-polyfill/formdata-to-blob.js
new file mode 100644
index 0000000..5a0a517
--- /dev/null
+++ b/node_modules/formdata-polyfill/formdata-to-blob.js
@@ -0,0 +1,39 @@
+/*! formdata-polyfill. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
+
+const escape = (str, filename) =>
+  (filename ? str : str.replace(/\r?\n|\r/g, '\r\n'))
+  .replace(/\n/g, '%0A')
+  .replace(/\r/g, '%0D')
+  .replace(/"/g, '%22')
+
+/**
+ * pure function to convert any formData instance to a Blob
+ * instances synchronous without reading all of the files
+ *
+ * @param {FormData|*} formData an instance of a formData Class
+ * @param {Blob|*} [BlobClass=Blob] the Blob class to use when constructing it
+ */
+export function formDataToBlob (formData, BlobClass = Blob) {
+  const boundary = ('----formdata-polyfill-' + Math.random())
+  const chunks = []
+  const prefix = `--${boundary}\r\nContent-Disposition: form-data; name="`
+
+  for (let [name, value] of formData) {
+    if (typeof value === 'string') {
+      chunks.push(prefix + escape(name) + `"\r\n\r\n${value.replace(/\r(?!\n)|(?<!\r)\n/g, '\r\n')}\r\n`)
+    } else {
+      chunks.push(
+        prefix + escape(name) + `"; filename="${escape(value.name, 1)}"\r\n` +
+        `Content-Type: ${value.type || 'application/octet-stream'}\r\n\r\n`,
+        value,
+        '\r\n'
+      )
+    }
+  }
+
+  chunks.push(`--${boundary}--`)
+
+  return new BlobClass(chunks, {
+    type: 'multipart/form-data; boundary=' + boundary
+  })
+}
diff --git a/node_modules/formdata-polyfill/formdata.min.js b/node_modules/formdata-polyfill/formdata.min.js
new file mode 100644
index 0000000..f4abd67
--- /dev/null
+++ b/node_modules/formdata-polyfill/formdata.min.js
@@ -0,0 +1,21 @@
+/*! formdata-polyfill. MIT License. Jimmy W?rting <https://jimmy.warting.se/opensource> */
+;(function(){var h;function l(a){var b=0;return function(){return b<a.length?{done:!1,value:a[b++]}:{done:!0}}}var m="function"==typeof Object.defineProperties?Object.defineProperty:function(a,b,c){if(a==Array.prototype||a==Object.prototype)return a;a[b]=c.value;return a};
+function n(a){a=["object"==typeof globalThis&&globalThis,a,"object"==typeof window&&window,"object"==typeof self&&self,"object"==typeof global&&global];for(var b=0;b<a.length;++b){var c=a[b];if(c&&c.Math==Math)return c}throw Error("Cannot find global object");}var q=n(this);function r(a,b){if(b)a:{var c=q;a=a.split(".");for(var d=0;d<a.length-1;d++){var e=a[d];if(!(e in c))break a;c=c[e]}a=a[a.length-1];d=c[a];b=b(d);b!=d&&null!=b&&m(c,a,{configurable:!0,writable:!0,value:b})}}
+r("Symbol",function(a){function b(f){if(this instanceof b)throw new TypeError("Symbol is not a constructor");return new c(d+(f||"")+"_"+e++,f)}function c(f,g){this.A=f;m(this,"description",{configurable:!0,writable:!0,value:g})}if(a)return a;c.prototype.toString=function(){return this.A};var d="jscomp_symbol_"+(1E9*Math.random()>>>0)+"_",e=0;return b});
+r("Symbol.iterator",function(a){if(a)return a;a=Symbol("Symbol.iterator");for(var b="Array Int8Array Uint8Array Uint8ClampedArray Int16Array Uint16Array Int32Array Uint32Array Float32Array Float64Array".split(" "),c=0;c<b.length;c++){var d=q[b[c]];"function"===typeof d&&"function"!=typeof d.prototype[a]&&m(d.prototype,a,{configurable:!0,writable:!0,value:function(){return u(l(this))}})}return a});function u(a){a={next:a};a[Symbol.iterator]=function(){return this};return a}
+function v(a){var b="undefined"!=typeof Symbol&&Symbol.iterator&&a[Symbol.iterator];return b?b.call(a):{next:l(a)}}var w;if("function"==typeof Object.setPrototypeOf)w=Object.setPrototypeOf;else{var y;a:{var z={a:!0},A={};try{A.__proto__=z;y=A.a;break a}catch(a){}y=!1}w=y?function(a,b){a.__proto__=b;if(a.__proto__!==b)throw new TypeError(a+" is not extensible");return a}:null}var B=w;function C(){this.m=!1;this.j=null;this.v=void 0;this.h=1;this.u=this.C=0;this.l=null}
+function D(a){if(a.m)throw new TypeError("Generator is already running");a.m=!0}C.prototype.o=function(a){this.v=a};C.prototype.s=function(a){this.l={D:a,F:!0};this.h=this.C||this.u};C.prototype.return=function(a){this.l={return:a};this.h=this.u};function E(a,b){a.h=3;return{value:b}}function F(a){this.g=new C;this.G=a}F.prototype.o=function(a){D(this.g);if(this.g.j)return G(this,this.g.j.next,a,this.g.o);this.g.o(a);return H(this)};
+function I(a,b){D(a.g);var c=a.g.j;if(c)return G(a,"return"in c?c["return"]:function(d){return{value:d,done:!0}},b,a.g.return);a.g.return(b);return H(a)}F.prototype.s=function(a){D(this.g);if(this.g.j)return G(this,this.g.j["throw"],a,this.g.o);this.g.s(a);return H(this)};
+function G(a,b,c,d){try{var e=b.call(a.g.j,c);if(!(e instanceof Object))throw new TypeError("Iterator result "+e+" is not an object");if(!e.done)return a.g.m=!1,e;var f=e.value}catch(g){return a.g.j=null,a.g.s(g),H(a)}a.g.j=null;d.call(a.g,f);return H(a)}function H(a){for(;a.g.h;)try{var b=a.G(a.g);if(b)return a.g.m=!1,{value:b.value,done:!1}}catch(c){a.g.v=void 0,a.g.s(c)}a.g.m=!1;if(a.g.l){b=a.g.l;a.g.l=null;if(b.F)throw b.D;return{value:b.return,done:!0}}return{value:void 0,done:!0}}
+function J(a){this.next=function(b){return a.o(b)};this.throw=function(b){return a.s(b)};this.return=function(b){return I(a,b)};this[Symbol.iterator]=function(){return this}}function K(a,b){b=new J(new F(b));B&&a.prototype&&B(b,a.prototype);return b}function L(a,b){a instanceof String&&(a+="");var c=0,d=!1,e={next:function(){if(!d&&c<a.length){var f=c++;return{value:b(f,a[f]),done:!1}}d=!0;return{done:!0,value:void 0}}};e[Symbol.iterator]=function(){return e};return e}
+r("Array.prototype.entries",function(a){return a?a:function(){return L(this,function(b,c){return[b,c]})}});
+if("undefined"!==typeof Blob&&("undefined"===typeof FormData||!FormData.prototype.keys)){var M=function(a,b){for(var c=0;c<a.length;c++)b(a[c])},N=function(a){return a.replace(/\r?\n|\r/g,"\r\n")},O=function(a,b,c){if(b instanceof Blob){c=void 0!==c?String(c+""):"string"===typeof b.name?b.name:"blob";if(b.name!==c||"[object Blob]"===Object.prototype.toString.call(b))b=new File([b],c);return[String(a),b]}return[String(a),String(b)]},P=function(a,b){if(a.length<b)throw new TypeError(b+" argument required, but only "+
+a.length+" present.");},Q="object"===typeof globalThis?globalThis:"object"===typeof window?window:"object"===typeof self?self:this,R=Q.FormData,S=Q.XMLHttpRequest&&Q.XMLHttpRequest.prototype.send,T=Q.Request&&Q.fetch,U=Q.navigator&&Q.navigator.sendBeacon,V=Q.Element&&Q.Element.prototype,W=Q.Symbol&&Symbol.toStringTag;W&&(Blob.prototype[W]||(Blob.prototype[W]="Blob"),"File"in Q&&!File.prototype[W]&&(File.prototype[W]="File"));try{new File([],"")}catch(a){Q.File=function(b,c,d){b=new Blob(b,d||{});
+Object.defineProperties(b,{name:{value:c},lastModified:{value:+(d&&void 0!==d.lastModified?new Date(d.lastModified):new Date)},toString:{value:function(){return"[object File]"}}});W&&Object.defineProperty(b,W,{value:"File"});return b}}var escape=function(a){return a.replace(/\n/g,"%0A").replace(/\r/g,"%0D").replace(/"/g,"%22")},X=function(a){this.i=[];var b=this;a&&M(a.elements,function(c){if(c.name&&!c.disabled&&"submit"!==c.type&&"button"!==c.type&&!c.matches("form fieldset[disabled] *"))if("file"===
+c.type){var d=c.files&&c.files.length?c.files:[new File([],"",{type:"application/octet-stream"})];M(d,function(e){b.append(c.name,e)})}else"select-multiple"===c.type||"select-one"===c.type?M(c.options,function(e){!e.disabled&&e.selected&&b.append(c.name,e.value)}):"checkbox"===c.type||"radio"===c.type?c.checked&&b.append(c.name,c.value):(d="textarea"===c.type?N(c.value):c.value,b.append(c.name,d))})};h=X.prototype;h.append=function(a,b,c){P(arguments,2);this.i.push(O(a,b,c))};h.delete=function(a){P(arguments,
+1);var b=[];a=String(a);M(this.i,function(c){c[0]!==a&&b.push(c)});this.i=b};h.entries=function b(){var c,d=this;return K(b,function(e){1==e.h&&(c=0);if(3!=e.h)return c<d.i.length?e=E(e,d.i[c]):(e.h=0,e=void 0),e;c++;e.h=2})};h.forEach=function(b,c){P(arguments,1);for(var d=v(this),e=d.next();!e.done;e=d.next()){var f=v(e.value);e=f.next().value;f=f.next().value;b.call(c,f,e,this)}};h.get=function(b){P(arguments,1);var c=this.i;b=String(b);for(var d=0;d<c.length;d++)if(c[d][0]===b)return c[d][1];
+return null};h.getAll=function(b){P(arguments,1);var c=[];b=String(b);M(this.i,function(d){d[0]===b&&c.push(d[1])});return c};h.has=function(b){P(arguments,1);b=String(b);for(var c=0;c<this.i.length;c++)if(this.i[c][0]===b)return!0;return!1};h.keys=function c(){var d=this,e,f,g,k,p;return K(c,function(t){1==t.h&&(e=v(d),f=e.next());if(3!=t.h){if(f.done){t.h=0;return}g=f.value;k=v(g);p=k.next().value;return E(t,p)}f=e.next();t.h=2})};h.set=function(c,d,e){P(arguments,2);c=String(c);var f=[],g=O(c,
+d,e),k=!0;M(this.i,function(p){p[0]===c?k&&(k=!f.push(g)):f.push(p)});k&&f.push(g);this.i=f};h.values=function d(){var e=this,f,g,k,p,t;return K(d,function(x){1==x.h&&(f=v(e),g=f.next());if(3!=x.h){if(g.done){x.h=0;return}k=g.value;p=v(k);p.next();t=p.next().value;return E(x,t)}g=f.next();x.h=2})};X.prototype._asNative=function(){for(var d=new R,e=v(this),f=e.next();!f.done;f=e.next()){var g=v(f.value);f=g.next().value;g=g.next().value;d.append(f,g)}return d};X.prototype._blob=function(){var d="----formdata-polyfill-"+
+Math.random(),e=[],f="--"+d+'\r\nContent-Disposition: form-data; name="';this.forEach(function(g,k){return"string"==typeof g?e.push(f+escape(N(k))+('"\r\n\r\n'+N(g)+"\r\n")):e.push(f+escape(N(k))+('"; filename="'+escape(g.name)+'"\r\nContent-Type: '+(g.type||"application/octet-stream")+"\r\n\r\n"),g,"\r\n")});e.push("--"+d+"--");return new Blob(e,{type:"multipart/form-data; boundary="+d})};X.prototype[Symbol.iterator]=function(){return this.entries()};X.prototype.toString=function(){return"[object FormData]"};
+V&&!V.matches&&(V.matches=V.matchesSelector||V.mozMatchesSelector||V.msMatchesSelector||V.oMatchesSelector||V.webkitMatchesSelector||function(d){d=(this.document||this.ownerDocument).querySelectorAll(d);for(var e=d.length;0<=--e&&d.item(e)!==this;);return-1<e});W&&(X.prototype[W]="FormData");if(S){var Y=Q.XMLHttpRequest.prototype.setRequestHeader;Q.XMLHttpRequest.prototype.setRequestHeader=function(d,e){Y.call(this,d,e);"content-type"===d.toLowerCase()&&(this.B=!0)};Q.XMLHttpRequest.prototype.send=
+function(d){d instanceof X?(d=d._blob(),this.B||this.setRequestHeader("Content-Type",d.type),S.call(this,d)):S.call(this,d)}}T&&(Q.fetch=function(d,e){e&&e.body&&e.body instanceof X&&(e.body=e.body._blob());return T.call(this,d,e)});U&&(Q.navigator.sendBeacon=function(d,e){e instanceof X&&(e=e._asNative());return U.call(this,d,e)});Q.FormData=X};})();
diff --git a/node_modules/formdata-polyfill/package.json b/node_modules/formdata-polyfill/package.json
new file mode 100644
index 0000000..501a064
--- /dev/null
+++ b/node_modules/formdata-polyfill/package.json
@@ -0,0 +1,50 @@
+{
+  "name": "formdata-polyfill",
+  "version": "4.0.10",
+  "description": "HTML5 `FormData` for Browsers and Node.",
+  "type": "module",
+  "main": "formdata.min.js",
+  "scripts": {
+    "build": "node build.js",
+    "test": "node test/test-esm.js",
+    "test-wpt": "node --experimental-loader ./test/http-loader.js ./test/test-wpt-in-node.js",
+    "test-polyfill": "php -S localhost:4445 & open http://localhost:4445/test/test-polyfill.html"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://jimmywarting@github.com/jimmywarting/FormData.git"
+  },
+  "files": [
+    "esm.min.js",
+    "esm.min.d.ts",
+    "FormData.js",
+    "formdata-to-blob.js",
+    "formdata.min.js",
+    "README.md"
+  ],
+  "engines": {
+    "node": ">=12.20.0"
+  },
+  "keywords": [
+    "formdata",
+    "fetch",
+    "node-fetch",
+    "html5",
+    "browser",
+    "polyfill"
+  ],
+  "author": "Jimmy Wärting",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/jimmywarting/FormData/issues"
+  },
+  "homepage": "https://github.com/jimmywarting/FormData#readme",
+  "dependencies": {
+    "fetch-blob": "^3.1.2"
+  },
+  "devDependencies": {
+    "@types/google-closure-compiler": "^0.0.19",
+    "@types/node": "^16.7.10",
+    "google-closure-compiler": "^20210808.0.0"
+  }
+}
diff --git a/node_modules/node-domexception/.history/README_20210527203617.md b/node_modules/node-domexception/.history/README_20210527203617.md
new file mode 100644
index 0000000..38d8f85
--- /dev/null
+++ b/node_modules/node-domexception/.history/README_20210527203617.md
@@ -0,0 +1,2 @@
+# node-domexception
+An implementation of the DOMException class from NodeJS
diff --git a/node_modules/node-domexception/.history/README_20210527212714.md b/node_modules/node-domexception/.history/README_20210527212714.md
new file mode 100644
index 0000000..eed1d13
--- /dev/null
+++ b/node_modules/node-domexception/.history/README_20210527212714.md
@@ -0,0 +1,41 @@
+# DOMException
+An implementation of the DOMException class from NodeJS
+
+This package implements the [`DOMException`](https://developer.mozilla.org/en-US/docs/Web/API/DOMException) class, from NodeJS itself.
+NodeJS has DOMException built in, but it's not globally available, and you can't require/import it from somewhere.
+
+The only possible way is to use some web-ish tools that have been introduced into NodeJS that throws an error and catch the constructor.
+This way you will have the same class that NodeJS has and you can check if the error is a instance of DOMException.
+The instanceof check would not have worked with a custom class such as the DOMexception provided by domenic which also is much larger in size.
+
+```js
+import DOMException from 'node-domexception'
+
+hello().catch(err => {
+  if (err instanceof DOMException) {
+    ...
+  }
+})
+
+const e1 = new DOMException("Something went wrong", "BadThingsError");
+console.assert(e1.name === "BadThingsError");
+console.assert(e1.code === 0);
+
+const e2 = new DOMException("Another exciting error message", "NoModificationAllowedError");
+console.assert(e2.name === "NoModificationAllowedError");
+console.assert(e2.code === 7);
+
+console.assert(DOMException.INUSE_ATTRIBUTE_ERR === 10);
+```
+
+## APIs
+
+This package exposes two flavors of the `DOMException` interface depending on the imported module.
+
+### `domexception` module
+
+This module default-exports the `DOMException` interface constructor.
+
+### `domexception/webidl2js-wrapper` module
+
+This module exports the `DOMException` [interface wrapper API](https://github.com/jsdom/webidl2js#for-interfaces) generated by [webidl2js](https://github.com/jsdom/webidl2js).
diff --git a/node_modules/node-domexception/.history/README_20210527213345.md b/node_modules/node-domexception/.history/README_20210527213345.md
new file mode 100644
index 0000000..5825416
--- /dev/null
+++ b/node_modules/node-domexception/.history/README_20210527213345.md
@@ -0,0 +1,36 @@
+# DOMException
+An implementation of the DOMException class from NodeJS
+
+This package implements the [`DOMException`](https://developer.mozilla.org/en-US/docs/Web/API/DOMException) class, from NodeJS itself. (including the legacy codes)
+NodeJS has DOMException built in, but it's not globally available, and you can't require/import it from somewhere.
+
+The only possible way is to use some web-ish tools that have been introduced into NodeJS that throws an error and catch the constructor.
+This way you will have the same class that NodeJS has and you can check if the error is a instance of DOMException.
+The instanceof check would not have worked with a custom class such as the DOMException provided by domenic which also is much larger in size.
+
+```js
+import DOMException from 'node-domexception'
+import { MessageChannel } from 'worker_threads'
+
+async function hello() {
+  const port = new MessageChannel().port1
+  const ab = new ArrayBuffer()
+  port.postMessage(ab, [ab, ab])
+}
+
+hello().catch(err => {
+  console.assert(err.name === 'DataCloneError')
+  console.assert(err.code === 25)
+  console.assert(err instanceof DOMException)
+})
+
+const e1 = new DOMException('Something went wrong', 'BadThingsError')
+console.assert(e1.name === 'BadThingsError')
+console.assert(e1.code === 0)
+
+const e2 = new DOMException('Another exciting error message', 'NoModificationAllowedError')
+console.assert(e2.name === 'NoModificationAllowedError')
+console.assert(e2.code === 7)
+
+console.assert(DOMException.INUSE_ATTRIBUTE_ERR === 10)
+```
diff --git a/node_modules/node-domexception/.history/README_20210527213411.md b/node_modules/node-domexception/.history/README_20210527213411.md
new file mode 100644
index 0000000..4c21ec8
--- /dev/null
+++ b/node_modules/node-domexception/.history/README_20210527213411.md
@@ -0,0 +1,36 @@
+# DOMException
+An implementation of the DOMException class from NodeJS
+
+This package implements the [`DOMException`](https://developer.mozilla.org/en-US/docs/Web/API/DOMException) class that comes from NodeJS itself. (including the legacy codes)
+NodeJS has DOMException built in, but it's not globally available, and you can't require/import it from somewhere.
+
+The only possible way is to use some web-ish tools that have been introduced into NodeJS that throws an error and catch the constructor.
+This way you will have the same class that NodeJS has and you can check if the error is a instance of DOMException.
+The instanceof check would not have worked with a custom class such as the DOMException provided by domenic which also is much larger in size.
+
+```js
+import DOMException from 'node-domexception'
+import { MessageChannel } from 'worker_threads'
+
+async function hello() {
+  const port = new MessageChannel().port1
+  const ab = new ArrayBuffer()
+  port.postMessage(ab, [ab, ab])
+}
+
+hello().catch(err => {
+  console.assert(err.name === 'DataCloneError')
+  console.assert(err.code === 25)
+  console.assert(err instanceof DOMException)
+})
+
+const e1 = new DOMException('Something went wrong', 'BadThingsError')
+console.assert(e1.name === 'BadThingsError')
+console.assert(e1.code === 0)
+
+const e2 = new DOMException('Another exciting error message', 'NoModificationAllowedError')
+console.assert(e2.name === 'NoModificationAllowedError')
+console.assert(e2.code === 7)
+
+console.assert(DOMException.INUSE_ATTRIBUTE_ERR === 10)
+```
diff --git a/node_modules/node-domexception/.history/README_20210527213803.md b/node_modules/node-domexception/.history/README_20210527213803.md
new file mode 100644
index 0000000..4cb8571
--- /dev/null
+++ b/node_modules/node-domexception/.history/README_20210527213803.md
@@ -0,0 +1,36 @@
+# DOMException
+An implementation of the DOMException class from NodeJS
+
+This package exposes the [`DOMException`](https://developer.mozilla.org/en-US/docs/Web/API/DOMException) class that comes from NodeJS itself. (including all of the deprecated legacy codes)
+NodeJS has it built in, but it's not globally available, and you can't require/import it from somewhere.
+
+The only possible way is to use some web-ish tools that have been introduced into NodeJS that throws an error and catch the constructor.
+This way you will have the same class that NodeJS has and you can check if the error is a instance of DOMException.
+The instanceof check would not have worked with a custom class such as the DOMException provided by domenic which also is much larger in size since it has to re-construct the hole class from the ground up.
+
+```js
+import DOMException from 'node-domexception'
+import { MessageChannel } from 'worker_threads'
+
+async function hello() {
+  const port = new MessageChannel().port1
+  const ab = new ArrayBuffer()
+  port.postMessage(ab, [ab, ab])
+}
+
+hello().catch(err => {
+  console.assert(err.name === 'DataCloneError')
+  console.assert(err.code === 25)
+  console.assert(err instanceof DOMException)
+})
+
+const e1 = new DOMException('Something went wrong', 'BadThingsError')
+console.assert(e1.name === 'BadThingsError')
+console.assert(e1.code === 0)
+
+const e2 = new DOMException('Another exciting error message', 'NoModificationAllowedError')
+console.assert(e2.name === 'NoModificationAllowedError')
+console.assert(e2.code === 7)
+
+console.assert(DOMException.INUSE_ATTRIBUTE_ERR === 10)
+```
diff --git a/node_modules/node-domexception/.history/README_20210527214323.md b/node_modules/node-domexception/.history/README_20210527214323.md
new file mode 100644
index 0000000..a32a91b
--- /dev/null
+++ b/node_modules/node-domexception/.history/README_20210527214323.md
@@ -0,0 +1,38 @@
+# DOMException
+An implementation of the DOMException class from NodeJS
+
+This package exposes the [`DOMException`](https://developer.mozilla.org/en-US/docs/Web/API/DOMException) class that comes from NodeJS itself. (including all of the deprecated legacy codes)
+NodeJS has it built in, but it's not globally available, and you can't require/import it from somewhere.
+
+The only possible way is to use some web-ish tools that have been introduced into NodeJS that throws an error and catch the constructor.
+This way you will have the same class that NodeJS has and you can check if the error is a instance of DOMException.
+The instanceof check would not have worked with a custom class such as the DOMException provided by domenic which also is much larger in size since it has to re-construct the hole class from the ground up.
+
+(plz don't depend on this package in any other environment other than node >=10.5)
+
+```js
+import DOMException from 'node-domexception'
+import { MessageChannel } from 'worker_threads'
+
+async function hello() {
+  const port = new MessageChannel().port1
+  const ab = new ArrayBuffer()
+  port.postMessage(ab, [ab, ab])
+}
+
+hello().catch(err => {
+  console.assert(err.name === 'DataCloneError')
+  console.assert(err.code === 25)
+  console.assert(err instanceof DOMException)
+})
+
+const e1 = new DOMException('Something went wrong', 'BadThingsError')
+console.assert(e1.name === 'BadThingsError')
+console.assert(e1.code === 0)
+
+const e2 = new DOMException('Another exciting error message', 'NoModificationAllowedError')
+console.assert(e2.name === 'NoModificationAllowedError')
+console.assert(e2.code === 7)
+
+console.assert(DOMException.INUSE_ATTRIBUTE_ERR === 10)
+```
diff --git a/node_modules/node-domexception/.history/README_20210527214408.md b/node_modules/node-domexception/.history/README_20210527214408.md
new file mode 100644
index 0000000..a32a91b
--- /dev/null
+++ b/node_modules/node-domexception/.history/README_20210527214408.md
@@ -0,0 +1,38 @@
+# DOMException
+An implementation of the DOMException class from NodeJS
+
+This package exposes the [`DOMException`](https://developer.mozilla.org/en-US/docs/Web/API/DOMException) class that comes from NodeJS itself. (including all of the deprecated legacy codes)
+NodeJS has it built in, but it's not globally available, and you can't require/import it from somewhere.
+
+The only possible way is to use some web-ish tools that have been introduced into NodeJS that throws an error and catch the constructor.
+This way you will have the same class that NodeJS has and you can check if the error is a instance of DOMException.
+The instanceof check would not have worked with a custom class such as the DOMException provided by domenic which also is much larger in size since it has to re-construct the hole class from the ground up.
+
+(plz don't depend on this package in any other environment other than node >=10.5)
+
+```js
+import DOMException from 'node-domexception'
+import { MessageChannel } from 'worker_threads'
+
+async function hello() {
+  const port = new MessageChannel().port1
+  const ab = new ArrayBuffer()
+  port.postMessage(ab, [ab, ab])
+}
+
+hello().catch(err => {
+  console.assert(err.name === 'DataCloneError')
+  console.assert(err.code === 25)
+  console.assert(err instanceof DOMException)
+})
+
+const e1 = new DOMException('Something went wrong', 'BadThingsError')
+console.assert(e1.name === 'BadThingsError')
+console.assert(e1.code === 0)
+
+const e2 = new DOMException('Another exciting error message', 'NoModificationAllowedError')
+console.assert(e2.name === 'NoModificationAllowedError')
+console.assert(e2.code === 7)
+
+console.assert(DOMException.INUSE_ATTRIBUTE_ERR === 10)
+```
diff --git a/node_modules/node-domexception/.history/index_20210527203842.js b/node_modules/node-domexception/.history/index_20210527203842.js
new file mode 100644
index 0000000..e69de29
diff --git a/node_modules/node-domexception/.history/index_20210527203947.js b/node_modules/node-domexception/.history/index_20210527203947.js
new file mode 100644
index 0000000..b9a8b76
--- /dev/null
+++ b/node_modules/node-domexception/.history/index_20210527203947.js
@@ -0,0 +1,8 @@
+const { MessageChannel } = require('worker_threads')
+
+if (!globalThis.DOMException) {
+  const port = new MessageChannel().port1
+  const ab = new ArrayBuffer()
+  try { port.postMessage(ab, [ab, ab]) }
+  catch (err) { globalThis.DOMException = err.constructor }
+}
diff --git a/node_modules/node-domexception/.history/index_20210527204259.js b/node_modules/node-domexception/.history/index_20210527204259.js
new file mode 100644
index 0000000..e9332a8
--- /dev/null
+++ b/node_modules/node-domexception/.history/index_20210527204259.js
@@ -0,0 +1,9 @@
+if (!globalThis.DOMException) {
+  const { MessageChannel } = require('worker_threads')
+  const port = new MessageChannel().port1
+  const ab = new ArrayBuffer()
+  try { port.postMessage(ab, [ab, ab]) }
+  catch (err) { globalThis.DOMException = err.constructor }
+}
+
+module.exports
diff --git a/node_modules/node-domexception/.history/index_20210527204418.js b/node_modules/node-domexception/.history/index_20210527204418.js
new file mode 100644
index 0000000..cb362cc
--- /dev/null
+++ b/node_modules/node-domexception/.history/index_20210527204418.js
@@ -0,0 +1,9 @@
+if (!globalThis.DOMException) {
+  const { MessageChannel } = require('worker_threads')
+  const port = new MessageChannel().port1
+  const ab = new ArrayBuffer()
+  try { port.postMessage(ab, [ab, ab]) }
+  catch (err) { globalThis.DOMException = err.constructor }
+}
+
+module.exports = globalThis.DOMException
diff --git a/node_modules/node-domexception/.history/index_20210527204756.js b/node_modules/node-domexception/.history/index_20210527204756.js
new file mode 100644
index 0000000..87d2655
--- /dev/null
+++ b/node_modules/node-domexception/.history/index_20210527204756.js
@@ -0,0 +1,11 @@
+/*! blob-to-buffer. MIT License. Jimmy Wärting <https://jimmy.warting.se> */
+
+if (!globalThis.DOMException) {
+  const { MessageChannel } = require('worker_threads')
+  const port = new MessageChannel().port1
+  const ab = new ArrayBuffer()
+  try { port.postMessage(ab, [ab, ab]) }
+  catch (err) { globalThis.DOMException = err.constructor }
+}
+
+module.exports = globalThis.DOMException
diff --git a/node_modules/node-domexception/.history/index_20210527204833.js b/node_modules/node-domexception/.history/index_20210527204833.js
new file mode 100644
index 0000000..837ebda
--- /dev/null
+++ b/node_modules/node-domexception/.history/index_20210527204833.js
@@ -0,0 +1,11 @@
+/*! blob-to-buffer. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
+
+if (!globalThis.DOMException) {
+  const { MessageChannel } = require('worker_threads')
+  const port = new MessageChannel().port1
+  const ab = new ArrayBuffer()
+  try { port.postMessage(ab, [ab, ab]) }
+  catch (err) { globalThis.DOMException = err.constructor }
+}
+
+module.exports = globalThis.DOMException
diff --git a/node_modules/node-domexception/.history/index_20210527211208.js b/node_modules/node-domexception/.history/index_20210527211208.js
new file mode 100644
index 0000000..ba215ce
--- /dev/null
+++ b/node_modules/node-domexception/.history/index_20210527211208.js
@@ -0,0 +1,15 @@
+/*! blob-to-buffer. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
+
+if (!globalThis.DOMException) {
+  var { MessageChannel } = require('worker_threads'),
+  port = new MessageChannel().port1,
+  ab = new ArrayBuffer()
+  try { port.postMessage(ab, [ab, ab]) }
+  catch (err) {
+    err.constructor.name === 'DOMException' && (
+      globalThis.DOMException = err.constructor
+    )
+  }
+}
+
+module.exports = globalThis.DOMException
diff --git a/node_modules/node-domexception/.history/index_20210527211248.js b/node_modules/node-domexception/.history/index_20210527211248.js
new file mode 100644
index 0000000..f5c434e
--- /dev/null
+++ b/node_modules/node-domexception/.history/index_20210527211248.js
@@ -0,0 +1,15 @@
+/*! blob-to-buffer. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
+
+if (!globalThis.DOMException) {
+  const { MessageChannel } = require('worker_threads'),
+  port = new MessageChannel().port1,
+  ab = new ArrayBuffer()
+  try { port.postMessage(ab, [ab, ab]) }
+  catch (err) {
+    err.constructor.name === 'DOMException' && (
+      globalThis.DOMException = err.constructor
+    )
+  }
+}
+
+module.exports = globalThis.DOMException
diff --git a/node_modules/node-domexception/.history/index_20210527212722.js b/node_modules/node-domexception/.history/index_20210527212722.js
new file mode 100644
index 0000000..91b3b52
--- /dev/null
+++ b/node_modules/node-domexception/.history/index_20210527212722.js
@@ -0,0 +1,23 @@
+/*! blob-to-buffer. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
+
+if (!globalThis.DOMException) {
+  const { MessageChannel } = require('worker_threads'),
+  port = new MessageChannel().port1,
+  ab = new ArrayBuffer()
+  try { port.postMessage(ab, [ab, ab]) }
+  catch (err) {
+    err.constructor.name === 'DOMException' && (
+      globalThis.DOMException = err.constructor
+    )
+  }
+}
+
+module.exports = globalThis.DOMException
+
+const e1 = new DOMException("Something went wrong", "BadThingsError");
+console.assert(e1.name === "BadThingsError");
+console.assert(e1.code === 0);
+
+const e2 = new DOMException("Another exciting error message", "NoModificationAllowedError");
+console.assert(e2.name === "NoModificationAllowedError");
+console.assert(e2.code === 7);
diff --git a/node_modules/node-domexception/.history/index_20210527212731.js b/node_modules/node-domexception/.history/index_20210527212731.js
new file mode 100644
index 0000000..cf28864
--- /dev/null
+++ b/node_modules/node-domexception/.history/index_20210527212731.js
@@ -0,0 +1,23 @@
+/*! blob-to-buffer. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
+
+if (!globalThis.DOMException) {
+  const { MessageChannel } = require('worker_threads'),
+  port = new MessageChannel().port1,
+  ab = new ArrayBuffer()
+  try { port.postMessage(ab, [ab, ab]) }
+  catch (err) {
+    err.constructor.name === 'DOMException' && (
+      globalThis.DOMException = err.constructor
+    )
+  }
+}
+
+module.exports = globalThis.DOMException
+
+const e1 = new DOMException("Something went wrong", "BadThingsError");
+console.assert(e1.name === "BadThingsError");
+console.assert(e1.code === 0);
+
+const e2 = new DOMException("Another exciting error message", "NoModificationAllowedError");
+console.assert(e2.name === "NoModificationAllowedError");
+console.assert(e2.code === 2);
diff --git a/node_modules/node-domexception/.history/index_20210527212746.js b/node_modules/node-domexception/.history/index_20210527212746.js
new file mode 100644
index 0000000..f5c434e
--- /dev/null
+++ b/node_modules/node-domexception/.history/index_20210527212746.js
@@ -0,0 +1,15 @@
+/*! blob-to-buffer. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
+
+if (!globalThis.DOMException) {
+  const { MessageChannel } = require('worker_threads'),
+  port = new MessageChannel().port1,
+  ab = new ArrayBuffer()
+  try { port.postMessage(ab, [ab, ab]) }
+  catch (err) {
+    err.constructor.name === 'DOMException' && (
+      globalThis.DOMException = err.constructor
+    )
+  }
+}
+
+module.exports = globalThis.DOMException
diff --git a/node_modules/node-domexception/.history/index_20210527212900.js b/node_modules/node-domexception/.history/index_20210527212900.js
new file mode 100644
index 0000000..efa2442
--- /dev/null
+++ b/node_modules/node-domexception/.history/index_20210527212900.js
@@ -0,0 +1,16 @@
+/*! blob-to-buffer. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
+
+if (!globalThis.DOMException) {
+  const { MessageChannel } = require('worker_threads'),
+  port = new MessageChannel().port1,
+  ab = new ArrayBuffer()
+  try { port.postMessage(ab, [ab, ab]) }
+  catch (err) {
+    console.log(err.code)
+    err.constructor.name === 'DOMException' && (
+      globalThis.DOMException = err.constructor
+    )
+  }
+}
+
+module.exports = globalThis.DOMException
diff --git a/node_modules/node-domexception/.history/index_20210527213022.js b/node_modules/node-domexception/.history/index_20210527213022.js
new file mode 100644
index 0000000..e59f047
--- /dev/null
+++ b/node_modules/node-domexception/.history/index_20210527213022.js
@@ -0,0 +1,16 @@
+/*! blob-to-buffer. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
+
+if (!globalThis.DOMException) {
+  const { MessageChannel } = require('worker_threads'),
+  port = new MessageChannel().port1,
+  ab = new ArrayBuffer()
+  try { port.postMessage(ab, [ab, ab]) }
+  catch (err) {
+    console.log(err.code, err.name, err.message)
+    err.constructor.name === 'DOMException' && (
+      globalThis.DOMException = err.constructor
+    )
+  }
+}
+
+module.exports = globalThis.DOMException
diff --git a/node_modules/node-domexception/.history/index_20210527213822.js b/node_modules/node-domexception/.history/index_20210527213822.js
new file mode 100644
index 0000000..7f4e13d
--- /dev/null
+++ b/node_modules/node-domexception/.history/index_20210527213822.js
@@ -0,0 +1,16 @@
+/*! node-DOMException. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
+
+if (!globalThis.DOMException) {
+  const { MessageChannel } = require('worker_threads'),
+  port = new MessageChannel().port1,
+  ab = new ArrayBuffer()
+  try { port.postMessage(ab, [ab, ab]) }
+  catch (err) {
+    console.log(err.code, err.name, err.message)
+    err.constructor.name === 'DOMException' && (
+      globalThis.DOMException = err.constructor
+    )
+  }
+}
+
+module.exports = globalThis.DOMException
diff --git a/node_modules/node-domexception/.history/index_20210527213843.js b/node_modules/node-domexception/.history/index_20210527213843.js
new file mode 100644
index 0000000..ee75b73
--- /dev/null
+++ b/node_modules/node-domexception/.history/index_20210527213843.js
@@ -0,0 +1,17 @@
+/*! node-DOMException. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
+
+if (!globalThis.DOMException) {
+  try {
+    const { MessageChannel } = require('worker_threads'),
+    port = new MessageChannel().port1,
+    ab = new ArrayBuffer()
+    port.postMessage(ab, [ab, ab])
+  catch (err) {
+    console.log(err.code, err.name, err.message)
+    err.constructor.name === 'DOMException' && (
+      globalThis.DOMException = err.constructor
+    )
+  }
+}
+
+module.exports = globalThis.DOMException
diff --git a/node_modules/node-domexception/.history/index_20210527213852.js b/node_modules/node-domexception/.history/index_20210527213852.js
new file mode 100644
index 0000000..a82bee3
--- /dev/null
+++ b/node_modules/node-domexception/.history/index_20210527213852.js
@@ -0,0 +1,17 @@
+/*! node-DOMException. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
+
+if (!globalThis.DOMException) {
+  try {
+    const { MessageChannel } = require('worker_threads'),
+    port = new MessageChannel().port1,
+    ab = new ArrayBuffer()
+    port.postMessage(ab, [ab, ab])
+  } catch (err) {
+    console.log(err.code, err.name, err.message)
+    err.constructor.name === 'DOMException' && (
+      globalThis.DOMException = err.constructor
+    )
+  }
+}
+
+module.exports = globalThis.DOMException
diff --git a/node_modules/node-domexception/.history/index_20210527213910.js b/node_modules/node-domexception/.history/index_20210527213910.js
new file mode 100644
index 0000000..1e1ca29
--- /dev/null
+++ b/node_modules/node-domexception/.history/index_20210527213910.js
@@ -0,0 +1,16 @@
+/*! node-DOMException. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
+
+if (!globalThis.DOMException) {
+  try {
+    const { MessageChannel } = require('worker_threads'),
+    port = new MessageChannel().port1,
+    ab = new ArrayBuffer()
+    port.postMessage(ab, [ab, ab])
+  } catch (err) {
+    err.constructor.name === 'DOMException' && (
+      globalThis.DOMException = err.constructor
+    )
+  }
+}
+
+module.exports = globalThis.DOMException
diff --git a/node_modules/node-domexception/.history/index_20210527214034.js b/node_modules/node-domexception/.history/index_20210527214034.js
new file mode 100644
index 0000000..b7bbe95
--- /dev/null
+++ b/node_modules/node-domexception/.history/index_20210527214034.js
@@ -0,0 +1,16 @@
+/*! node-domexception. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
+
+if (!globalThis.DOMException) {
+  try {
+    const { MessageChannel } = require('worker_threads'),
+    port = new MessageChannel().port1,
+    ab = new ArrayBuffer()
+    port.postMessage(ab, [ab, ab])
+  } catch (err) {
+    err.constructor.name === 'DOMException' && (
+      globalThis.DOMException = err.constructor
+    )
+  }
+}
+
+module.exports = globalThis.DOMException
diff --git a/node_modules/node-domexception/.history/index_20210527214643.js b/node_modules/node-domexception/.history/index_20210527214643.js
new file mode 100644
index 0000000..92ed847
--- /dev/null
+++ b/node_modules/node-domexception/.history/index_20210527214643.js
@@ -0,0 +1,41 @@
+/*! node-domexception. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
+
+if (!globalThis.DOMException) {
+  try {
+    const { MessageChannel } = require('worker_threads'),
+    port = new MessageChannel().port1,
+    ab = new ArrayBuffer()
+    port.postMessage(ab, [ab, ab])
+  } catch (err) {
+    err.constructor.name === 'DOMException' && (
+      globalThis.DOMException = err.constructor
+    )
+  }
+}
+
+module.exports = globalThis.DOMException
+
+
+const  { MessageChannel } = require('worker_threads')
+
+async function hello() {
+  const port = new MessageChannel().port1
+  const ab = new ArrayBuffer()
+  port.postMessage(ab, [ab, ab])
+}
+
+hello().catch(err => {
+  console.assert(err.name === 'DataCloneError')
+  console.assert(err.code === 25)
+  console.assert(err instanceof DOMException)
+})
+
+const e1 = new DOMException('Something went wrong', 'BadThingsError')
+console.assert(e1.name === 'BadThingsError')
+console.assert(e1.code === 0)
+
+const e2 = new DOMException('Another exciting error message', 'NoModificationAllowedError')
+console.assert(e2.name === 'NoModificationAllowedError')
+console.assert(e2.code === 7)
+
+console.assert(DOMException.INUSE_ATTRIBUTE_ERR === 10)
diff --git a/node_modules/node-domexception/.history/index_20210527214654.js b/node_modules/node-domexception/.history/index_20210527214654.js
new file mode 100644
index 0000000..6d5cb8e
--- /dev/null
+++ b/node_modules/node-domexception/.history/index_20210527214654.js
@@ -0,0 +1,41 @@
+/*! node-domexception. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
+
+if (!globalThis.DOMException) {
+  try {
+    const { MessageChannel } = require('worker_threads'),
+    port = new MessageChannel().port1,
+    ab = new ArrayBuffer()
+    port.postMessage(ab, [ab, ab])
+  } catch (err) {
+    err.constructor.name === 'DOMException' && (
+      globalThis.DOMException = err.constructor
+    )
+  }
+}
+
+module.exports = globalThis.DOMException
+
+
+const  { MessageChannel } = require('worker_threads')
+
+async function hello() {
+  const port = new MessageChannel().port1
+  const ab = new ArrayBuffer()
+  port.postMessage(ab, [ab, ab])
+}
+
+hello().catch(err => {
+  console.assert(err.name === 'DataCloneError')
+  console.assert(err.code === 21)
+  console.assert(err instanceof DOMException)
+})
+
+const e1 = new DOMException('Something went wrong', 'BadThingsError')
+console.assert(e1.name === 'BadThingsError')
+console.assert(e1.code === 0)
+
+const e2 = new DOMException('Another exciting error message', 'NoModificationAllowedError')
+console.assert(e2.name === 'NoModificationAllowedError')
+console.assert(e2.code === 7)
+
+console.assert(DOMException.INUSE_ATTRIBUTE_ERR === 10)
diff --git a/node_modules/node-domexception/.history/index_20210527214700.js b/node_modules/node-domexception/.history/index_20210527214700.js
new file mode 100644
index 0000000..b7bbe95
--- /dev/null
+++ b/node_modules/node-domexception/.history/index_20210527214700.js
@@ -0,0 +1,16 @@
+/*! node-domexception. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
+
+if (!globalThis.DOMException) {
+  try {
+    const { MessageChannel } = require('worker_threads'),
+    port = new MessageChannel().port1,
+    ab = new ArrayBuffer()
+    port.postMessage(ab, [ab, ab])
+  } catch (err) {
+    err.constructor.name === 'DOMException' && (
+      globalThis.DOMException = err.constructor
+    )
+  }
+}
+
+module.exports = globalThis.DOMException
diff --git a/node_modules/node-domexception/.history/package_20210527203733.json b/node_modules/node-domexception/.history/package_20210527203733.json
new file mode 100644
index 0000000..5eeb306
--- /dev/null
+++ b/node_modules/node-domexception/.history/package_20210527203733.json
@@ -0,0 +1,19 @@
+{
+  "name": "domexception",
+  "version": "1.0.0",
+  "description": "An implementation of the DOMException class from NodeJS",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/jimmywarting/node-domexception.git"
+  },
+  "author": "",
+  "license": "ISC",
+  "bugs": {
+    "url": "https://github.com/jimmywarting/node-domexception/issues"
+  },
+  "homepage": "https://github.com/jimmywarting/node-domexception#readme"
+}
diff --git a/node_modules/node-domexception/.history/package_20210527203825.json b/node_modules/node-domexception/.history/package_20210527203825.json
new file mode 100644
index 0000000..4ca1713
--- /dev/null
+++ b/node_modules/node-domexception/.history/package_20210527203825.json
@@ -0,0 +1,16 @@
+{
+  "name": "node-domexception",
+  "version": "1.0.0",
+  "description": "An implementation of the DOMException class from NodeJS",
+  "main": "index.js",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/jimmywarting/node-domexception.git"
+  },
+  "author": "Jimmy Wärting",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/jimmywarting/node-domexception/issues"
+  },
+  "homepage": "https://github.com/jimmywarting/node-domexception#readme"
+}
diff --git a/node_modules/node-domexception/.history/package_20210527204621.json b/node_modules/node-domexception/.history/package_20210527204621.json
new file mode 100644
index 0000000..3c414e9
--- /dev/null
+++ b/node_modules/node-domexception/.history/package_20210527204621.json
@@ -0,0 +1,19 @@
+{
+  "name": "node-domexception",
+  "version": "1.0.0",
+  "description": "An implementation of the DOMException class from NodeJS",
+  "main": "index.js",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/jimmywarting/node-domexception.git"
+  },
+  "engines": {
+    "node": ">=10.5.0"
+  },
+  "author": "Jimmy Wärting",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/jimmywarting/node-domexception/issues"
+  },
+  "homepage": "https://github.com/jimmywarting/node-domexception#readme"
+}
diff --git a/node_modules/node-domexception/.history/package_20210527204913.json b/node_modules/node-domexception/.history/package_20210527204913.json
new file mode 100644
index 0000000..dbbb5d2
--- /dev/null
+++ b/node_modules/node-domexception/.history/package_20210527204913.json
@@ -0,0 +1,25 @@
+{
+  "name": "node-domexception",
+  "version": "1.0.0",
+  "description": "An implementation of the DOMException class from NodeJS",
+  "main": "index.js",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/jimmywarting/node-domexception.git"
+  },
+  "engines": {
+    "node": ">=10.5.0"
+  },
+  "author": "Jimmy Wärting",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/jimmywarting/node-domexception/issues"
+  },
+  "homepage": "https://github.com/jimmywarting/node-domexception#readme",
+  "funding": [
+    {
+      "type": "github",
+      "url": "https://github.com/sponsors/jimmywarting"
+    }
+  ]
+}
diff --git a/node_modules/node-domexception/.history/package_20210527204925.json b/node_modules/node-domexception/.history/package_20210527204925.json
new file mode 100644
index 0000000..dbbb5d2
--- /dev/null
+++ b/node_modules/node-domexception/.history/package_20210527204925.json
@@ -0,0 +1,25 @@
+{
+  "name": "node-domexception",
+  "version": "1.0.0",
+  "description": "An implementation of the DOMException class from NodeJS",
+  "main": "index.js",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/jimmywarting/node-domexception.git"
+  },
+  "engines": {
+    "node": ">=10.5.0"
+  },
+  "author": "Jimmy Wärting",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/jimmywarting/node-domexception/issues"
+  },
+  "homepage": "https://github.com/jimmywarting/node-domexception#readme",
+  "funding": [
+    {
+      "type": "github",
+      "url": "https://github.com/sponsors/jimmywarting"
+    }
+  ]
+}
diff --git a/node_modules/node-domexception/.history/package_20210527205145.json b/node_modules/node-domexception/.history/package_20210527205145.json
new file mode 100644
index 0000000..cd08e70
--- /dev/null
+++ b/node_modules/node-domexception/.history/package_20210527205145.json
@@ -0,0 +1,29 @@
+{
+  "name": "node-domexception",
+  "version": "1.0.0",
+  "description": "An implementation of the DOMException class from NodeJS",
+  "main": "index.js",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/jimmywarting/node-domexception.git"
+  },
+  "engines": {
+    "node": ">=10.5.0"
+  },
+  "author": "Jimmy Wärting",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/jimmywarting/node-domexception/issues"
+  },
+  "homepage": "https://github.com/jimmywarting/node-domexception#readme",
+  "funding": [
+    {
+      "type": "github",
+      "url": "https://github.com/sponsors/jimmywarting"
+    },
+    {
+      "type": "github",
+      "url": "https://paypal.me/jimmywarting"
+    }
+  ]
+}
diff --git a/node_modules/node-domexception/.history/package_20210527205156.json b/node_modules/node-domexception/.history/package_20210527205156.json
new file mode 100644
index 0000000..cd08e70
--- /dev/null
+++ b/node_modules/node-domexception/.history/package_20210527205156.json
@@ -0,0 +1,29 @@
+{
+  "name": "node-domexception",
+  "version": "1.0.0",
+  "description": "An implementation of the DOMException class from NodeJS",
+  "main": "index.js",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/jimmywarting/node-domexception.git"
+  },
+  "engines": {
+    "node": ">=10.5.0"
+  },
+  "author": "Jimmy Wärting",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/jimmywarting/node-domexception/issues"
+  },
+  "homepage": "https://github.com/jimmywarting/node-domexception#readme",
+  "funding": [
+    {
+      "type": "github",
+      "url": "https://github.com/sponsors/jimmywarting"
+    },
+    {
+      "type": "github",
+      "url": "https://paypal.me/jimmywarting"
+    }
+  ]
+}
diff --git a/node_modules/node-domexception/.history/test_20210527205603.js b/node_modules/node-domexception/.history/test_20210527205603.js
new file mode 100644
index 0000000..e69de29
diff --git a/node_modules/node-domexception/.history/test_20210527205957.js b/node_modules/node-domexception/.history/test_20210527205957.js
new file mode 100644
index 0000000..73feac5
--- /dev/null
+++ b/node_modules/node-domexception/.history/test_20210527205957.js
@@ -0,0 +1,3 @@
+require('./index.js')
+
+console.log(DOMException.INDEX_SIZE_ERR)
diff --git a/node_modules/node-domexception/.history/test_20210527210021.js b/node_modules/node-domexception/.history/test_20210527210021.js
new file mode 100644
index 0000000..be47491
--- /dev/null
+++ b/node_modules/node-domexception/.history/test_20210527210021.js
@@ -0,0 +1,3 @@
+const e = require('./index.js')
+
+console.log(e.INDEX_SIZE_ERR)
diff --git a/node_modules/node-domexception/LICENSE b/node_modules/node-domexception/LICENSE
new file mode 100644
index 0000000..bc8ceb7
--- /dev/null
+++ b/node_modules/node-domexception/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2021 Jimmy Wärting
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/node_modules/node-domexception/README.md b/node_modules/node-domexception/README.md
new file mode 100644
index 0000000..a369461
--- /dev/null
+++ b/node_modules/node-domexception/README.md
@@ -0,0 +1,46 @@
+# DOMException
+An implementation of the DOMException class from NodeJS
+
+NodeJS has DOMException built in, but it's not globally available, and you can't require/import it from somewhere.
+
+This package exposes the [`DOMException`](https://developer.mozilla.org/en-US/docs/Web/API/DOMException) class that comes from NodeJS itself. (including all of the legacy codes)
+
+<sub>(plz don't depend on this package in any other environment other than node >=10.5)</sub>
+
+```js
+import DOMException from 'node-domexception'
+import { MessageChannel } from 'worker_threads'
+
+async function hello() {
+  const port = new MessageChannel().port1
+  const ab = new ArrayBuffer()
+  port.postMessage(ab, [ab, ab])
+}
+
+hello().catch(err => {
+  console.assert(err.name === 'DataCloneError')
+  console.assert(err.code === 25)
+  console.assert(err instanceof DOMException)
+})
+
+const e1 = new DOMException('Something went wrong', 'BadThingsError')
+console.assert(e1.name === 'BadThingsError')
+console.assert(e1.code === 0)
+
+const e2 = new DOMException('Another exciting error message', 'NoModificationAllowedError')
+console.assert(e2.name === 'NoModificationAllowedError')
+console.assert(e2.code === 7)
+
+console.assert(DOMException.INUSE_ATTRIBUTE_ERR === 10)
+```
+
+# Background
+
+The only possible way is to use some web-ish tools that have been introduced into NodeJS that throws a DOMException and catch the constructor. This is exactly what this package dose for you and exposes it.<br>
+This way you will have the same class that NodeJS has and you can check if the error is a instance of DOMException.<br>
+The instanceof check would not have worked with a custom class such as the DOMException provided by domenic which also is much larger in size since it has to re-construct the hole class from the ground up.
+
+The DOMException is used in many places such as the Fetch API, File & Blobs, PostMessaging and more. <br>
+Why they decided to call it **DOM**, I don't know
+
+Please consider sponsoring if you find this helpful
diff --git a/node_modules/node-domexception/index.js b/node_modules/node-domexception/index.js
new file mode 100644
index 0000000..b7bbe95
--- /dev/null
+++ b/node_modules/node-domexception/index.js
@@ -0,0 +1,16 @@
+/*! node-domexception. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
+
+if (!globalThis.DOMException) {
+  try {
+    const { MessageChannel } = require('worker_threads'),
+    port = new MessageChannel().port1,
+    ab = new ArrayBuffer()
+    port.postMessage(ab, [ab, ab])
+  } catch (err) {
+    err.constructor.name === 'DOMException' && (
+      globalThis.DOMException = err.constructor
+    )
+  }
+}
+
+module.exports = globalThis.DOMException
diff --git a/node_modules/node-domexception/package.json b/node_modules/node-domexception/package.json
new file mode 100644
index 0000000..cd08e70
--- /dev/null
+++ b/node_modules/node-domexception/package.json
@@ -0,0 +1,29 @@
+{
+  "name": "node-domexception",
+  "version": "1.0.0",
+  "description": "An implementation of the DOMException class from NodeJS",
+  "main": "index.js",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/jimmywarting/node-domexception.git"
+  },
+  "engines": {
+    "node": ">=10.5.0"
+  },
+  "author": "Jimmy Wärting",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/jimmywarting/node-domexception/issues"
+  },
+  "homepage": "https://github.com/jimmywarting/node-domexception#readme",
+  "funding": [
+    {
+      "type": "github",
+      "url": "https://github.com/sponsors/jimmywarting"
+    },
+    {
+      "type": "github",
+      "url": "https://paypal.me/jimmywarting"
+    }
+  ]
+}
diff --git a/node_modules/node-fetch/@types/index.d.ts b/node_modules/node-fetch/@types/index.d.ts
new file mode 100644
index 0000000..274ca03
--- /dev/null
+++ b/node_modules/node-fetch/@types/index.d.ts
@@ -0,0 +1,219 @@
+/// <reference types="node" />
+
+import {RequestOptions} from 'http';
+import {FormData} from 'formdata-polyfill/esm.min.js';
+import {
+	Blob,
+	blobFrom,
+	blobFromSync,
+	File,
+	fileFrom,
+	fileFromSync
+} from 'fetch-blob/from.js';
+
+type AbortSignal = {
+	readonly aborted: boolean;
+
+	addEventListener: (type: 'abort', listener: (this: AbortSignal) => void) => void;
+	removeEventListener: (type: 'abort', listener: (this: AbortSignal) => void) => void;
+};
+
+export type HeadersInit = Headers | Record<string, string> | Iterable<readonly [string, string]> | Iterable<Iterable<string>>;
+
+export {
+	FormData,
+	Blob,
+	blobFrom,
+	blobFromSync,
+	File,
+	fileFrom,
+	fileFromSync
+};
+
+/**
+ * This Fetch API interface allows you to perform various actions on HTTP request and response headers.
+ * These actions include retrieving, setting, adding to, and removing.
+ * A Headers object has an associated header list, which is initially empty and consists of zero or more name and value pairs.
+ * You can add to this using methods like append() (see Examples.)
+ * In all methods of this interface, header names are matched by case-insensitive byte sequence.
+ * */
+export class Headers {
+	constructor(init?: HeadersInit);
+
+	append(name: string, value: string): void;
+	delete(name: string): void;
+	get(name: string): string | null;
+	has(name: string): boolean;
+	set(name: string, value: string): void;
+	forEach(
+		callbackfn: (value: string, key: string, parent: Headers) => void,
+		thisArg?: any
+	): void;
+
+	[Symbol.iterator](): IterableIterator<[string, string]>;
+	/**
+	 * Returns an iterator allowing to go through all key/value pairs contained in this object.
+	 */
+	entries(): IterableIterator<[string, string]>;
+	/**
+	 * Returns an iterator allowing to go through all keys of the key/value pairs contained in this object.
+	 */
+	keys(): IterableIterator<string>;
+	/**
+	 * Returns an iterator allowing to go through all values of the key/value pairs contained in this object.
+	 */
+	values(): IterableIterator<string>;
+
+	/** Node-fetch extension */
+	raw(): Record<string, string[]>;
+}
+
+export interface RequestInit {
+	/**
+	 * A BodyInit object or null to set request's body.
+	 */
+	body?: BodyInit | null;
+	/**
+	 * A Headers object, an object literal, or an array of two-item arrays to set request's headers.
+	 */
+	headers?: HeadersInit;
+	/**
+	 * A string to set request's method.
+	 */
+	method?: string;
+	/**
+	 * A string indicating whether request follows redirects, results in an error upon encountering a redirect, or returns the redirect (in an opaque fashion). Sets request's redirect.
+	 */
+	redirect?: RequestRedirect;
+	/**
+	 * An AbortSignal to set request's signal.
+	 */
+	signal?: AbortSignal | null;
+	/**
+	 * A string whose value is a same-origin URL, "about:client", or the empty string, to set request’s referrer.
+	 */
+	referrer?: string;
+	/**
+	 * A referrer policy to set request’s referrerPolicy.
+	 */
+	referrerPolicy?: ReferrerPolicy;
+
+	// Node-fetch extensions to the whatwg/fetch spec
+	agent?: RequestOptions['agent'] | ((parsedUrl: URL) => RequestOptions['agent']);
+	compress?: boolean;
+	counter?: number;
+	follow?: number;
+	hostname?: string;
+	port?: number;
+	protocol?: string;
+	size?: number;
+	highWaterMark?: number;
+	insecureHTTPParser?: boolean;
+}
+
+export interface ResponseInit {
+	headers?: HeadersInit;
+	status?: number;
+	statusText?: string;
+}
+
+export type BodyInit =
+	| Blob
+	| Buffer
+	| URLSearchParams
+	| FormData
+	| NodeJS.ReadableStream
+	| string;
+declare class BodyMixin {
+	constructor(body?: BodyInit, options?: {size?: number});
+
+	readonly body: NodeJS.ReadableStream | null;
+	readonly bodyUsed: boolean;
+	readonly size: number;
+
+	/** @deprecated Use `body.arrayBuffer()` instead. */
+	buffer(): Promise<Buffer>;
+	arrayBuffer(): Promise<ArrayBuffer>;
+	formData(): Promise<FormData>;
+	blob(): Promise<Blob>;
+	json(): Promise<unknown>;
+	text(): Promise<string>;
+}
+
+// `Body` must not be exported as a class since it's not exported from the JavaScript code.
+export interface Body extends Pick<BodyMixin, keyof BodyMixin> {}
+
+export type RequestRedirect = 'error' | 'follow' | 'manual';
+export type ReferrerPolicy = '' | 'no-referrer' | 'no-referrer-when-downgrade' | 'same-origin' | 'origin' | 'strict-origin' | 'origin-when-cross-origin' | 'strict-origin-when-cross-origin' | 'unsafe-url';
+export type RequestInfo = string | Request;
+export class Request extends BodyMixin {
+	constructor(input: URL | RequestInfo, init?: RequestInit);
+
+	/**
+	 * Returns a Headers object consisting of the headers associated with request. Note that headers added in the network layer by the user agent will not be accounted for in this object, e.g., the "Host" header.
+	 */
+	readonly headers: Headers;
+	/**
+	 * Returns request's HTTP method, which is "GET" by default.
+	 */
+	readonly method: string;
+	/**
+	 * Returns the redirect mode associated with request, which is a string indicating how redirects for the request will be handled during fetching. A request will follow redirects by default.
+	 */
+	readonly redirect: RequestRedirect;
+	/**
+	 * Returns the signal associated with request, which is an AbortSignal object indicating whether or not request has been aborted, and its abort event handler.
+	 */
+	readonly signal: AbortSignal;
+	/**
+	 * Returns the URL of request as a string.
+	 */
+	readonly url: string;
+	/**
+	 * A string whose value is a same-origin URL, "about:client", or the empty string, to set request’s referrer.
+	 */
+	readonly referrer: string;
+	/**
+	 * A referrer policy to set request’s referrerPolicy.
+	 */
+	readonly referrerPolicy: ReferrerPolicy;
+	clone(): Request;
+}
+
+type ResponseType = 'basic' | 'cors' | 'default' | 'error' | 'opaque' | 'opaqueredirect';
+
+export class Response extends BodyMixin {
+	constructor(body?: BodyInit | null, init?: ResponseInit);
+
+	readonly headers: Headers;
+	readonly ok: boolean;
+	readonly redirected: boolean;
+	readonly status: number;
+	readonly statusText: string;
+	readonly type: ResponseType;
+	readonly url: string;
+	clone(): Response;
+
+	static error(): Response;
+	static redirect(url: string, status?: number): Response;
+	static json(data: any, init?: ResponseInit): Response;
+}
+
+export class FetchError extends Error {
+	constructor(message: string, type: string, systemError?: Record<string, unknown>);
+
+	name: 'FetchError';
+	[Symbol.toStringTag]: 'FetchError';
+	type: string;
+	code?: string;
+	errno?: string;
+}
+
+export class AbortError extends Error {
+	type: string;
+	name: 'AbortError';
+	[Symbol.toStringTag]: 'AbortError';
+}
+
+export function isRedirect(code: number): boolean;
+export default function fetch(url: URL | RequestInfo, init?: RequestInit): Promise<Response>;
diff --git a/node_modules/node-fetch/LICENSE.md b/node_modules/node-fetch/LICENSE.md
new file mode 100644
index 0000000..41ca1b6
--- /dev/null
+++ b/node_modules/node-fetch/LICENSE.md
@@ -0,0 +1,22 @@
+The MIT License (MIT)
+
+Copyright (c) 2016 - 2020 Node Fetch Team
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
diff --git a/node_modules/node-fetch/README.md b/node_modules/node-fetch/README.md
new file mode 100644
index 0000000..badc2b1
--- /dev/null
+++ b/node_modules/node-fetch/README.md
@@ -0,0 +1,872 @@
+<div align="center">
+	<img src="docs/media/Banner.svg" alt="Node Fetch"/>
+	<br>
+	<p>A light-weight module that brings <a href="https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API">Fetch API</a> to Node.js.</p>
+	<a href="https://github.com/node-fetch/node-fetch/actions"><img src="https://github.com/node-fetch/node-fetch/workflows/CI/badge.svg?branch=master" alt="Build status"></a>
+	<a href="https://coveralls.io/github/node-fetch/node-fetch"><img src="https://img.shields.io/coveralls/github/node-fetch/node-fetch" alt="Coverage status"></a>
+	<a href="https://packagephobia.now.sh/result?p=node-fetch"><img src="https://badgen.net/packagephobia/install/node-fetch" alt="Current version"></a>
+	<a href="https://www.npmjs.com/package/node-fetch"><img src="https://img.shields.io/npm/v/node-fetch" alt="Install size"></a>
+	<a href="https://github.com/sindresorhus/awesome-nodejs"><img src="https://awesome.re/mentioned-badge.svg" alt="Mentioned in Awesome Node.js"></a>
+	<a href="https://discord.gg/Zxbndcm"><img src="https://img.shields.io/discord/619915844268326952?color=%237289DA&label=Discord" alt="Discord"></a>
+	<br>
+	<br>
+	<b>Consider supporting us on our Open Collective:</b>
+	<br>
+	<br>
+	<a href="https://opencollective.com/node-fetch"><img src="https://opencollective.com/node-fetch/donate/button.png?color=blue" alt="Open Collective"></a>
+</div>
+
+---
+
+**You might be looking for the [v2 docs](https://github.com/node-fetch/node-fetch/tree/2.x#readme)**
+
+<!-- TOC -->
+
+- [Motivation](#motivation)
+- [Features](#features)
+- [Difference from client-side fetch](#difference-from-client-side-fetch)
+- [Installation](#installation)
+- [Loading and configuring the module](#loading-and-configuring-the-module)
+- [Upgrading](#upgrading)
+- [Common Usage](#common-usage)
+	- [Plain text or HTML](#plain-text-or-html)
+	- [JSON](#json)
+	- [Simple Post](#simple-post)
+	- [Post with JSON](#post-with-json)
+	- [Post with form parameters](#post-with-form-parameters)
+	- [Handling exceptions](#handling-exceptions)
+	- [Handling client and server errors](#handling-client-and-server-errors)
+	- [Handling cookies](#handling-cookies)
+- [Advanced Usage](#advanced-usage)
+	- [Streams](#streams)
+	- [Accessing Headers and other Metadata](#accessing-headers-and-other-metadata)
+	- [Extract Set-Cookie Header](#extract-set-cookie-header)
+	- [Post data using a file](#post-data-using-a-file)
+	- [Request cancellation with AbortSignal](#request-cancellation-with-abortsignal)
+- [API](#api)
+	- [fetch(url[, options])](#fetchurl-options)
+	- [Options](#options)
+		- [Default Headers](#default-headers)
+		- [Custom Agent](#custom-agent)
+		- [Custom highWaterMark](#custom-highwatermark)
+		- [Insecure HTTP Parser](#insecure-http-parser)
+	- [Class: Request](#class-request)
+		- [new Request(input[, options])](#new-requestinput-options)
+	- [Class: Response](#class-response)
+		- [new Response([body[, options]])](#new-responsebody-options)
+		- [response.ok](#responseok)
+		- [response.redirected](#responseredirected)
+		- [response.type](#responsetype)
+	- [Class: Headers](#class-headers)
+		- [new Headers([init])](#new-headersinit)
+	- [Interface: Body](#interface-body)
+		- [body.body](#bodybody)
+		- [body.bodyUsed](#bodybodyused)
+		- [body.arrayBuffer()](#bodyarraybuffer)
+		- [body.blob()](#bodyblob)
+		- [body.formData()](#formdata)
+		- [body.json()](#bodyjson)
+		- [body.text()](#bodytext)
+	- [Class: FetchError](#class-fetcherror)
+	- [Class: AbortError](#class-aborterror)
+- [TypeScript](#typescript)
+- [Acknowledgement](#acknowledgement)
+- [Team](#team)
+				- [Former](#former)
+- [License](#license)
+
+<!-- /TOC -->
+
+## Motivation
+
+Instead of implementing `XMLHttpRequest` in Node.js to run browser-specific [Fetch polyfill](https://github.com/github/fetch), why not go from native `http` to `fetch` API directly? Hence, `node-fetch`, minimal code for a `window.fetch` compatible API on Node.js runtime.
+
+See Jason Miller's [isomorphic-unfetch](https://www.npmjs.com/package/isomorphic-unfetch) or Leonardo Quixada's [cross-fetch](https://github.com/lquixada/cross-fetch) for isomorphic usage (exports `node-fetch` for server-side, `whatwg-fetch` for client-side).
+
+## Features
+
+- Stay consistent with `window.fetch` API.
+- Make conscious trade-off when following [WHATWG fetch spec][whatwg-fetch] and [stream spec](https://streams.spec.whatwg.org/) implementation details, document known differences.
+- Use native promise and async functions.
+- Use native Node streams for body, on both request and response.
+- Decode content encoding (gzip/deflate/brotli) properly, and convert string output (such as `res.text()` and `res.json()`) to UTF-8 automatically.
+- Useful extensions such as redirect limit, response size limit, [explicit errors][error-handling.md] for troubleshooting.
+
+## Difference from client-side fetch
+
+- See known differences:
+	- [As of v3.x](docs/v3-LIMITS.md)
+	- [As of v2.x](docs/v2-LIMITS.md)
+- If you happen to use a missing feature that `window.fetch` offers, feel free to open an issue.
+- Pull requests are welcomed too!
+
+## Installation
+
+Current stable release (`3.x`) requires at least Node.js 12.20.0.
+
+```sh
+npm install node-fetch
+```
+
+## Loading and configuring the module
+
+### ES Modules (ESM)
+
+```js
+import fetch from 'node-fetch';
+```
+
+### CommonJS
+
+`node-fetch` from v3 is an ESM-only module - you are not able to import it with `require()`.
+
+If you cannot switch to ESM, please use v2 which remains compatible with CommonJS. Critical bug fixes will continue to be published for v2.
+
+```sh
+npm install node-fetch@2
+```
+
+Alternatively, you can use the async `import()` function from CommonJS to load `node-fetch` asynchronously:
+
+```js
+// mod.cjs
+const fetch = (...args) => import('node-fetch').then(({default: fetch}) => fetch(...args));
+```
+
+### Providing global access
+
+To use `fetch()` without importing it, you can patch the `global` object in node:
+
+```js
+// fetch-polyfill.js
+import fetch, {
+  Blob,
+  blobFrom,
+  blobFromSync,
+  File,
+  fileFrom,
+  fileFromSync,
+  FormData,
+  Headers,
+  Request,
+  Response,
+} from 'node-fetch'
+
+if (!globalThis.fetch) {
+  globalThis.fetch = fetch
+  globalThis.Headers = Headers
+  globalThis.Request = Request
+  globalThis.Response = Response
+}
+
+// index.js
+import './fetch-polyfill'
+
+// ...
+```
+
+## Upgrading
+
+Using an old version of node-fetch? Check out the following files:
+
+- [2.x to 3.x upgrade guide](docs/v3-UPGRADE-GUIDE.md)
+- [1.x to 2.x upgrade guide](docs/v2-UPGRADE-GUIDE.md)
+- [Changelog](https://github.com/node-fetch/node-fetch/releases)
+
+## Common Usage
+
+NOTE: The documentation below is up-to-date with `3.x` releases, if you are using an older version, please check how to [upgrade](#upgrading).
+
+### Plain text or HTML
+
+```js
+import fetch from 'node-fetch';
+
+const response = await fetch('https://github.com/');
+const body = await response.text();
+
+console.log(body);
+```
+
+### JSON
+
+```js
+import fetch from 'node-fetch';
+
+const response = await fetch('https://api.github.com/users/github');
+const data = await response.json();
+
+console.log(data);
+```
+
+### Simple Post
+
+```js
+import fetch from 'node-fetch';
+
+const response = await fetch('https://httpbin.org/post', {method: 'POST', body: 'a=1'});
+const data = await response.json();
+
+console.log(data);
+```
+
+### Post with JSON
+
+```js
+import fetch from 'node-fetch';
+
+const body = {a: 1};
+
+const response = await fetch('https://httpbin.org/post', {
+	method: 'post',
+	body: JSON.stringify(body),
+	headers: {'Content-Type': 'application/json'}
+});
+const data = await response.json();
+
+console.log(data);
+```
+
+### Post with form parameters
+
+`URLSearchParams` is available on the global object in Node.js as of v10.0.0. See [official documentation](https://nodejs.org/api/url.html#url_class_urlsearchparams) for more usage methods.
+
+NOTE: The `Content-Type` header is only set automatically to `x-www-form-urlencoded` when an instance of `URLSearchParams` is given as such:
+
+```js
+import fetch from 'node-fetch';
+
+const params = new URLSearchParams();
+params.append('a', 1);
+
+const response = await fetch('https://httpbin.org/post', {method: 'POST', body: params});
+const data = await response.json();
+
+console.log(data);
+```
+
+### Handling exceptions
+
+NOTE: 3xx-5xx responses are _NOT_ exceptions, and should be handled in `then()`, see the next section.
+
+Wrapping the fetch function into a `try/catch` block will catch _all_ exceptions, such as errors originating from node core libraries, like network errors, and operational errors which are instances of FetchError. See the [error handling document][error-handling.md] for more details.
+
+```js
+import fetch from 'node-fetch';
+
+try {
+	await fetch('https://domain.invalid/');
+} catch (error) {
+	console.log(error);
+}
+```
+
+### Handling client and server errors
+
+It is common to create a helper function to check that the response contains no client (4xx) or server (5xx) error responses:
+
+```js
+import fetch from 'node-fetch';
+
+class HTTPResponseError extends Error {
+	constructor(response) {
+		super(`HTTP Error Response: ${response.status} ${response.statusText}`);
+		this.response = response;
+	}
+}
+
+const checkStatus = response => {
+	if (response.ok) {
+		// response.status >= 200 && response.status < 300
+		return response;
+	} else {
+		throw new HTTPResponseError(response);
+	}
+}
+
+const response = await fetch('https://httpbin.org/status/400');
+
+try {
+	checkStatus(response);
+} catch (error) {
+	console.error(error);
+
+	const errorBody = await error.response.text();
+	console.error(`Error body: ${errorBody}`);
+}
+```
+
+### Handling cookies
+
+Cookies are not stored by default. However, cookies can be extracted and passed by manipulating request and response headers. See [Extract Set-Cookie Header](#extract-set-cookie-header) for details.
+
+## Advanced Usage
+
+### Streams
+
+The "Node.js way" is to use streams when possible. You can pipe `res.body` to another stream. This example uses [stream.pipeline](https://nodejs.org/api/stream.html#stream_stream_pipeline_streams_callback) to attach stream error handlers and wait for the download to complete.
+
+```js
+import {createWriteStream} from 'node:fs';
+import {pipeline} from 'node:stream';
+import {promisify} from 'node:util'
+import fetch from 'node-fetch';
+
+const streamPipeline = promisify(pipeline);
+
+const response = await fetch('https://github.githubassets.com/images/modules/logos_page/Octocat.png');
+
+if (!response.ok) throw new Error(`unexpected response ${response.statusText}`);
+
+await streamPipeline(response.body, createWriteStream('./octocat.png'));
+```
+
+In Node.js 14 you can also use async iterators to read `body`; however, be careful to catch
+errors -- the longer a response runs, the more likely it is to encounter an error.
+
+```js
+import fetch from 'node-fetch';
+
+const response = await fetch('https://httpbin.org/stream/3');
+
+try {
+	for await (const chunk of response.body) {
+		console.dir(JSON.parse(chunk.toString()));
+	}
+} catch (err) {
+	console.error(err.stack);
+}
+```
+
+In Node.js 12 you can also use async iterators to read `body`; however, async iterators with streams
+did not mature until Node.js 14, so you need to do some extra work to ensure you handle errors
+directly from the stream and wait on it response to fully close.
+
+```js
+import fetch from 'node-fetch';
+
+const read = async body => {
+	let error;
+	body.on('error', err => {
+		error = err;
+	});
+
+	for await (const chunk of body) {
+		console.dir(JSON.parse(chunk.toString()));
+	}
+
+	return new Promise((resolve, reject) => {
+		body.on('close', () => {
+			error ? reject(error) : resolve();
+		});
+	});
+};
+
+try {
+	const response = await fetch('https://httpbin.org/stream/3');
+	await read(response.body);
+} catch (err) {
+	console.error(err.stack);
+}
+```
+
+### Accessing Headers and other Metadata
+
+```js
+import fetch from 'node-fetch';
+
+const response = await fetch('https://github.com/');
+
+console.log(response.ok);
+console.log(response.status);
+console.log(response.statusText);
+console.log(response.headers.raw());
+console.log(response.headers.get('content-type'));
+```
+
+### Extract Set-Cookie Header
+
+Unlike browsers, you can access raw `Set-Cookie` headers manually using `Headers.raw()`. This is a `node-fetch` only API.
+
+```js
+import fetch from 'node-fetch';
+
+const response = await fetch('https://example.com');
+
+// Returns an array of values, instead of a string of comma-separated values
+console.log(response.headers.raw()['set-cookie']);
+```
+
+### Post data using a file
+
+```js
+import fetch, {
+  Blob,
+  blobFrom,
+  blobFromSync,
+  File,
+  fileFrom,
+  fileFromSync,
+} from 'node-fetch'
+
+const mimetype = 'text/plain'
+const blob = fileFromSync('./input.txt', mimetype)
+const url = 'https://httpbin.org/post'
+
+const response = await fetch(url, { method: 'POST', body: blob })
+const data = await response.json()
+
+console.log(data)
+```
+
+node-fetch comes with a spec-compliant [FormData] implementations for posting
+multipart/form-data payloads
+
+```js
+import fetch, { FormData, File, fileFrom } from 'node-fetch'
+
+const httpbin = 'https://httpbin.org/post'
+const formData = new FormData()
+const binary = new Uint8Array([ 97, 98, 99 ])
+const abc = new File([binary], 'abc.txt', { type: 'text/plain' })
+
+formData.set('greeting', 'Hello, world!')
+formData.set('file-upload', abc, 'new name.txt')
+
+const response = await fetch(httpbin, { method: 'POST', body: formData })
+const data = await response.json()
+
+console.log(data)
+```
+
+If you for some reason need to post a stream coming from any arbitrary place,
+then you can append a [Blob] or a [File] look-a-like item.
+
+The minimum requirement is that it has:
+1. A `Symbol.toStringTag` getter or property that is either `Blob` or `File`
+2. A known size.
+3. And either a `stream()` method or a `arrayBuffer()` method that returns a ArrayBuffer.
+
+The `stream()` must return any async iterable object as long as it yields Uint8Array (or Buffer)
+so Node.Readable streams and whatwg streams works just fine.
+
+```js
+formData.append('upload', {
+	[Symbol.toStringTag]: 'Blob',
+	size: 3,
+  *stream() {
+    yield new Uint8Array([97, 98, 99])
+	},
+	arrayBuffer() {
+		return new Uint8Array([97, 98, 99]).buffer
+	}
+}, 'abc.txt')
+```
+
+### Request cancellation with AbortSignal
+
+You may cancel requests with `AbortController`. A suggested implementation is [`abort-controller`](https://www.npmjs.com/package/abort-controller).
+
+An example of timing out a request after 150ms could be achieved as the following:
+
+```js
+import fetch, { AbortError } from 'node-fetch';
+
+// AbortController was added in node v14.17.0 globally
+const AbortController = globalThis.AbortController || await import('abort-controller')
+
+const controller = new AbortController();
+const timeout = setTimeout(() => {
+	controller.abort();
+}, 150);
+
+try {
+	const response = await fetch('https://example.com', {signal: controller.signal});
+	const data = await response.json();
+} catch (error) {
+	if (error instanceof AbortError) {
+		console.log('request was aborted');
+	}
+} finally {
+	clearTimeout(timeout);
+}
+```
+
+See [test cases](https://github.com/node-fetch/node-fetch/blob/master/test/) for more examples.
+
+## API
+
+### fetch(url[, options])
+
+- `url` A string representing the URL for fetching
+- `options` [Options](#fetch-options) for the HTTP(S) request
+- Returns: <code>Promise&lt;[Response](#class-response)&gt;</code>
+
+Perform an HTTP(S) fetch.
+
+`url` should be an absolute URL, such as `https://example.com/`. A path-relative URL (`/file/under/root`) or protocol-relative URL (`//can-be-http-or-https.com/`) will result in a rejected `Promise`.
+
+<a id="fetch-options"></a>
+
+### Options
+
+The default values are shown after each option key.
+
+```js
+{
+	// These properties are part of the Fetch Standard
+	method: 'GET',
+	headers: {},            // Request headers. format is the identical to that accepted by the Headers constructor (see below)
+	body: null,             // Request body. can be null, or a Node.js Readable stream
+	redirect: 'follow',     // Set to `manual` to extract redirect headers, `error` to reject redirect
+	signal: null,           // Pass an instance of AbortSignal to optionally abort requests
+
+	// The following properties are node-fetch extensions
+	follow: 20,             // maximum redirect count. 0 to not follow redirect
+	compress: true,         // support gzip/deflate content encoding. false to disable
+	size: 0,                // maximum response body size in bytes. 0 to disable
+	agent: null,            // http(s).Agent instance or function that returns an instance (see below)
+	highWaterMark: 16384,   // the maximum number of bytes to store in the internal buffer before ceasing to read from the underlying resource.
+	insecureHTTPParser: false	// Use an insecure HTTP parser that accepts invalid HTTP headers when `true`.
+}
+```
+
+#### Default Headers
+
+If no values are set, the following request headers will be sent automatically:
+
+| Header              | Value                                                  |
+| ------------------- | ------------------------------------------------------ |
+| `Accept-Encoding`   | `gzip, deflate, br` (when `options.compress === true`) |
+| `Accept`            | `*/*`                                                  |
+| `Content-Length`    | _(automatically calculated, if possible)_              |
+| `Host`              | _(host and port information from the target URI)_      |
+| `Transfer-Encoding` | `chunked` _(when `req.body` is a stream)_              |
+| `User-Agent`        | `node-fetch`                                           |
+
+
+Note: when `body` is a `Stream`, `Content-Length` is not set automatically.
+
+#### Custom Agent
+
+The `agent` option allows you to specify networking related options which are out of the scope of Fetch, including and not limited to the following:
+
+- Support self-signed certificate
+- Use only IPv4 or IPv6
+- Custom DNS Lookup
+
+See [`http.Agent`](https://nodejs.org/api/http.html#http_new_agent_options) for more information.
+
+If no agent is specified, the default agent provided by Node.js is used. Note that [this changed in Node.js 19](https://github.com/nodejs/node/blob/4267b92604ad78584244488e7f7508a690cb80d0/lib/_http_agent.js#L564) to have `keepalive` true by default. If you wish to enable `keepalive` in an earlier version of Node.js, you can override the agent as per the following code sample. 
+
+In addition, the `agent` option accepts a function that returns `http`(s)`.Agent` instance given current [URL](https://nodejs.org/api/url.html), this is useful during a redirection chain across HTTP and HTTPS protocol.
+
+```js
+import http from 'node:http';
+import https from 'node:https';
+
+const httpAgent = new http.Agent({
+	keepAlive: true
+});
+const httpsAgent = new https.Agent({
+	keepAlive: true
+});
+
+const options = {
+	agent: function(_parsedURL) {
+		if (_parsedURL.protocol == 'http:') {
+			return httpAgent;
+		} else {
+			return httpsAgent;
+		}
+	}
+};
+```
+
+<a id="custom-highWaterMark"></a>
+
+#### Custom highWaterMark
+
+Stream on Node.js have a smaller internal buffer size (16kB, aka `highWaterMark`) from client-side browsers (>1MB, not consistent across browsers). Because of that, when you are writing an isomorphic app and using `res.clone()`, it will hang with large response in Node.
+
+The recommended way to fix this problem is to resolve cloned response in parallel:
+
+```js
+import fetch from 'node-fetch';
+
+const response = await fetch('https://example.com');
+const r1 = response.clone();
+
+const results = await Promise.all([response.json(), r1.text()]);
+
+console.log(results[0]);
+console.log(results[1]);
+```
+
+If for some reason you don't like the solution above, since `3.x` you are able to modify the `highWaterMark` option:
+
+```js
+import fetch from 'node-fetch';
+
+const response = await fetch('https://example.com', {
+	// About 1MB
+	highWaterMark: 1024 * 1024
+});
+
+const result = await res.clone().arrayBuffer();
+console.dir(result);
+```
+
+#### Insecure HTTP Parser
+
+Passed through to the `insecureHTTPParser` option on http(s).request. See [`http.request`](https://nodejs.org/api/http.html#http_http_request_url_options_callback) for more information.
+
+#### Manual Redirect
+
+The `redirect: 'manual'` option for node-fetch is different from the browser & specification, which
+results in an [opaque-redirect filtered response](https://fetch.spec.whatwg.org/#concept-filtered-response-opaque-redirect).
+node-fetch gives you the typical [basic filtered response](https://fetch.spec.whatwg.org/#concept-filtered-response-basic) instead.
+
+```js
+import fetch from 'node-fetch';
+
+const response = await fetch('https://httpbin.org/status/301', { redirect: 'manual' });
+
+if (response.status === 301 || response.status === 302) {
+	const locationURL = new URL(response.headers.get('location'), response.url);
+	const response2 = await fetch(locationURL, { redirect: 'manual' });
+	console.dir(response2);
+}
+```
+
+<a id="class-request"></a>
+
+### Class: Request
+
+An HTTP(S) request containing information about URL, method, headers, and the body. This class implements the [Body](#iface-body) interface.
+
+Due to the nature of Node.js, the following properties are not implemented at this moment:
+
+- `type`
+- `destination`
+- `mode`
+- `credentials`
+- `cache`
+- `integrity`
+- `keepalive`
+
+The following node-fetch extension properties are provided:
+
+- `follow`
+- `compress`
+- `counter`
+- `agent`
+- `highWaterMark`
+
+See [options](#fetch-options) for exact meaning of these extensions.
+
+#### new Request(input[, options])
+
+<small>_(spec-compliant)_</small>
+
+- `input` A string representing a URL, or another `Request` (which will be cloned)
+- `options` [Options](#fetch-options) for the HTTP(S) request
+
+Constructs a new `Request` object. The constructor is identical to that in the [browser](https://developer.mozilla.org/en-US/docs/Web/API/Request/Request).
+
+In most cases, directly `fetch(url, options)` is simpler than creating a `Request` object.
+
+<a id="class-response"></a>
+
+### Class: Response
+
+An HTTP(S) response. This class implements the [Body](#iface-body) interface.
+
+The following properties are not implemented in node-fetch at this moment:
+
+- `trailer`
+
+#### new Response([body[, options]])
+
+<small>_(spec-compliant)_</small>
+
+- `body` A `String` or [`Readable` stream][node-readable]
+- `options` A [`ResponseInit`][response-init] options dictionary
+
+Constructs a new `Response` object. The constructor is identical to that in the [browser](https://developer.mozilla.org/en-US/docs/Web/API/Response/Response).
+
+Because Node.js does not implement service workers (for which this class was designed), one rarely has to construct a `Response` directly.
+
+#### response.ok
+
+<small>_(spec-compliant)_</small>
+
+Convenience property representing if the request ended normally. Will evaluate to true if the response status was greater than or equal to 200 but smaller than 300.
+
+#### response.redirected
+
+<small>_(spec-compliant)_</small>
+
+Convenience property representing if the request has been redirected at least once. Will evaluate to true if the internal redirect counter is greater than 0.
+
+#### response.type
+
+<small>_(deviation from spec)_</small>
+
+Convenience property representing the response's type. node-fetch only supports `'default'` and `'error'` and does not make use of [filtered responses](https://fetch.spec.whatwg.org/#concept-filtered-response).
+
+<a id="class-headers"></a>
+
+### Class: Headers
+
+This class allows manipulating and iterating over a set of HTTP headers. All methods specified in the [Fetch Standard][whatwg-fetch] are implemented.
+
+#### new Headers([init])
+
+<small>_(spec-compliant)_</small>
+
+- `init` Optional argument to pre-fill the `Headers` object
+
+Construct a new `Headers` object. `init` can be either `null`, a `Headers` object, an key-value map object or any iterable object.
+
+```js
+// Example adapted from https://fetch.spec.whatwg.org/#example-headers-class
+import {Headers} from 'node-fetch';
+
+const meta = {
+	'Content-Type': 'text/xml'
+};
+const headers = new Headers(meta);
+
+// The above is equivalent to
+const meta = [['Content-Type', 'text/xml']];
+const headers = new Headers(meta);
+
+// You can in fact use any iterable objects, like a Map or even another Headers
+const meta = new Map();
+meta.set('Content-Type', 'text/xml');
+const headers = new Headers(meta);
+const copyOfHeaders = new Headers(headers);
+```
+
+<a id="iface-body"></a>
+
+### Interface: Body
+
+`Body` is an abstract interface with methods that are applicable to both `Request` and `Response` classes.
+
+#### body.body
+
+<small>_(deviation from spec)_</small>
+
+- Node.js [`Readable` stream][node-readable]
+
+Data are encapsulated in the `Body` object. Note that while the [Fetch Standard][whatwg-fetch] requires the property to always be a WHATWG `ReadableStream`, in node-fetch it is a Node.js [`Readable` stream][node-readable].
+
+#### body.bodyUsed
+
+<small>_(spec-compliant)_</small>
+
+- `Boolean`
+
+A boolean property for if this body has been consumed. Per the specs, a consumed body cannot be used again.
+
+#### body.arrayBuffer()
+
+#### body.formData()
+
+#### body.blob()
+
+#### body.json()
+
+#### body.text()
+
+`fetch` comes with methods to parse `multipart/form-data` payloads as well as
+`x-www-form-urlencoded` bodies using `.formData()` this comes from the idea that
+Service Worker can intercept such messages before it's sent to the server to
+alter them. This is useful for anybody building a server so you can use it to
+parse & consume payloads.
+
+<details>
+<summary>Code example</summary>
+
+```js
+import http from 'node:http'
+import { Response } from 'node-fetch'
+
+http.createServer(async function (req, res) {
+  const formData = await new Response(req, {
+    headers: req.headers // Pass along the boundary value
+  }).formData()
+  const allFields = [...formData]
+
+  const file = formData.get('uploaded-files')
+  const arrayBuffer = await file.arrayBuffer()
+  const text = await file.text()
+  const whatwgReadableStream = file.stream()
+
+  // other was to consume the request could be to do:
+  const json = await new Response(req).json()
+  const text = await new Response(req).text()
+  const arrayBuffer = await new Response(req).arrayBuffer()
+  const blob = await new Response(req, {
+    headers: req.headers // So that `type` inherits `Content-Type`
+  }.blob()
+})
+```
+
+</details>
+
+<a id="class-fetcherror"></a>
+
+### Class: FetchError
+
+<small>_(node-fetch extension)_</small>
+
+An operational error in the fetching process. See [ERROR-HANDLING.md][] for more info.
+
+<a id="class-aborterror"></a>
+
+### Class: AbortError
+
+<small>_(node-fetch extension)_</small>
+
+An Error thrown when the request is aborted in response to an `AbortSignal`'s `abort` event. It has a `name` property of `AbortError`. See [ERROR-HANDLING.MD][] for more info.
+
+## TypeScript
+
+**Since `3.x` types are bundled with `node-fetch`, so you don't need to install any additional packages.**
+
+For older versions please use the type definitions from [DefinitelyTyped](https://github.com/DefinitelyTyped/DefinitelyTyped):
+
+```sh
+npm install --save-dev @types/node-fetch@2.x
+```
+
+## Acknowledgement
+
+Thanks to [github/fetch](https://github.com/github/fetch) for providing a solid implementation reference.
+
+## Team
+
+| [![David Frank](https://github.com/bitinn.png?size=100)](https://github.com/bitinn) | [![Jimmy Wärting](https://github.com/jimmywarting.png?size=100)](https://github.com/jimmywarting) | [![Antoni Kepinski](https://github.com/xxczaki.png?size=100)](https://github.com/xxczaki) | [![Richie Bendall](https://github.com/Richienb.png?size=100)](https://github.com/Richienb) | [![Gregor Martynus](https://github.com/gr2m.png?size=100)](https://github.com/gr2m) |
+| ----------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------ | ----------------------------------------------------------------------------------- |
+| [David Frank](https://bitinn.net/)                                                  | [Jimmy Wärting](https://jimmy.warting.se/)                                                        | [Antoni Kepinski](https://kepinski.ch)                                                    | [Richie Bendall](https://www.richie-bendall.ml/)                                           | [Gregor Martynus](https://twitter.com/gr2m)                                         |
+
+###### Former
+
+- [Timothy Gu](https://github.com/timothygu)
+- [Jared Kantrowitz](https://github.com/jkantr)
+
+## License
+
+[MIT](LICENSE.md)
+
+[whatwg-fetch]: https://fetch.spec.whatwg.org/
+[response-init]: https://fetch.spec.whatwg.org/#responseinit
+[node-readable]: https://nodejs.org/api/stream.html#stream_readable_streams
+[mdn-headers]: https://developer.mozilla.org/en-US/docs/Web/API/Headers
+[error-handling.md]: https://github.com/node-fetch/node-fetch/blob/master/docs/ERROR-HANDLING.md
+[FormData]: https://developer.mozilla.org/en-US/docs/Web/API/FormData
+[Blob]: https://developer.mozilla.org/en-US/docs/Web/API/Blob
+[File]: https://developer.mozilla.org/en-US/docs/Web/API/File
diff --git a/node_modules/node-fetch/package.json b/node_modules/node-fetch/package.json
new file mode 100644
index 0000000..2b4e858
--- /dev/null
+++ b/node_modules/node-fetch/package.json
@@ -0,0 +1,131 @@
+{
+  "name": "node-fetch",
+  "version": "3.3.2",
+  "description": "A light-weight module that brings Fetch API to node.js",
+  "main": "./src/index.js",
+  "sideEffects": false,
+  "type": "module",
+  "files": [
+    "src",
+    "@types/index.d.ts"
+  ],
+  "types": "./@types/index.d.ts",
+  "engines": {
+    "node": "^12.20.0 || ^14.13.1 || >=16.0.0"
+  },
+  "scripts": {
+    "test": "mocha",
+    "coverage": "c8 report --reporter=text-lcov | coveralls",
+    "test-types": "tsd",
+    "lint": "xo"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/node-fetch/node-fetch.git"
+  },
+  "keywords": [
+    "fetch",
+    "http",
+    "promise",
+    "request",
+    "curl",
+    "wget",
+    "xhr",
+    "whatwg"
+  ],
+  "author": "David Frank",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/node-fetch/node-fetch/issues"
+  },
+  "homepage": "https://github.com/node-fetch/node-fetch",
+  "funding": {
+    "type": "opencollective",
+    "url": "https://opencollective.com/node-fetch"
+  },
+  "devDependencies": {
+    "abort-controller": "^3.0.0",
+    "abortcontroller-polyfill": "^1.7.1",
+    "busboy": "^1.4.0",
+    "c8": "^7.7.2",
+    "chai": "^4.3.4",
+    "chai-as-promised": "^7.1.1",
+    "chai-iterator": "^3.0.2",
+    "chai-string": "^1.5.0",
+    "coveralls": "^3.1.0",
+    "form-data": "^4.0.0",
+    "formdata-node": "^4.2.4",
+    "mocha": "^9.1.3",
+    "p-timeout": "^5.0.0",
+    "stream-consumers": "^1.0.1",
+    "tsd": "^0.14.0",
+    "xo": "^0.39.1"
+  },
+  "dependencies": {
+    "data-uri-to-buffer": "^4.0.0",
+    "fetch-blob": "^3.1.4",
+    "formdata-polyfill": "^4.0.10"
+  },
+  "tsd": {
+    "cwd": "@types",
+    "compilerOptions": {
+      "esModuleInterop": true
+    }
+  },
+  "xo": {
+    "envs": [
+      "node",
+      "browser"
+    ],
+    "ignores": [
+      "example.js"
+    ],
+    "rules": {
+      "complexity": 0,
+      "import/extensions": 0,
+      "import/no-useless-path-segments": 0,
+      "import/no-anonymous-default-export": 0,
+      "import/no-named-as-default": 0,
+      "unicorn/import-index": 0,
+      "unicorn/no-array-reduce": 0,
+      "unicorn/prefer-node-protocol": 0,
+      "unicorn/numeric-separators-style": 0,
+      "unicorn/explicit-length-check": 0,
+      "capitalized-comments": 0,
+      "node/no-unsupported-features/es-syntax": 0,
+      "@typescript-eslint/member-ordering": 0
+    },
+    "overrides": [
+      {
+        "files": "test/**/*.js",
+        "envs": [
+          "node",
+          "mocha"
+        ],
+        "rules": {
+          "max-nested-callbacks": 0,
+          "no-unused-expressions": 0,
+          "no-warning-comments": 0,
+          "new-cap": 0,
+          "guard-for-in": 0,
+          "unicorn/no-array-for-each": 0,
+          "unicorn/prevent-abbreviations": 0,
+          "promise/prefer-await-to-then": 0,
+          "ava/no-import-test-files": 0
+        }
+      }
+    ]
+  },
+  "runkitExampleFilename": "example.js",
+  "release": {
+    "branches": [
+      "+([0-9]).x",
+      "main",
+      "next",
+      {
+        "name": "beta",
+        "prerelease": true
+      }
+    ]
+  }
+}
diff --git a/node_modules/node-fetch/src/body.js b/node_modules/node-fetch/src/body.js
new file mode 100644
index 0000000..714e27e
--- /dev/null
+++ b/node_modules/node-fetch/src/body.js
@@ -0,0 +1,397 @@
+
+/**
+ * Body.js
+ *
+ * Body interface provides common methods for Request and Response
+ */
+
+import Stream, {PassThrough} from 'node:stream';
+import {types, deprecate, promisify} from 'node:util';
+import {Buffer} from 'node:buffer';
+
+import Blob from 'fetch-blob';
+import {FormData, formDataToBlob} from 'formdata-polyfill/esm.min.js';
+
+import {FetchError} from './errors/fetch-error.js';
+import {FetchBaseError} from './errors/base.js';
+import {isBlob, isURLSearchParameters} from './utils/is.js';
+
+const pipeline = promisify(Stream.pipeline);
+const INTERNALS = Symbol('Body internals');
+
+/**
+ * Body mixin
+ *
+ * Ref: https://fetch.spec.whatwg.org/#body
+ *
+ * @param   Stream  body  Readable stream
+ * @param   Object  opts  Response options
+ * @return  Void
+ */
+export default class Body {
+	constructor(body, {
+		size = 0
+	} = {}) {
+		let boundary = null;
+
+		if (body === null) {
+			// Body is undefined or null
+			body = null;
+		} else if (isURLSearchParameters(body)) {
+			// Body is a URLSearchParams
+			body = Buffer.from(body.toString());
+		} else if (isBlob(body)) {
+			// Body is blob
+		} else if (Buffer.isBuffer(body)) {
+			// Body is Buffer
+		} else if (types.isAnyArrayBuffer(body)) {
+			// Body is ArrayBuffer
+			body = Buffer.from(body);
+		} else if (ArrayBuffer.isView(body)) {
+			// Body is ArrayBufferView
+			body = Buffer.from(body.buffer, body.byteOffset, body.byteLength);
+		} else if (body instanceof Stream) {
+			// Body is stream
+		} else if (body instanceof FormData) {
+			// Body is FormData
+			body = formDataToBlob(body);
+			boundary = body.type.split('=')[1];
+		} else {
+			// None of the above
+			// coerce to string then buffer
+			body = Buffer.from(String(body));
+		}
+
+		let stream = body;
+
+		if (Buffer.isBuffer(body)) {
+			stream = Stream.Readable.from(body);
+		} else if (isBlob(body)) {
+			stream = Stream.Readable.from(body.stream());
+		}
+
+		this[INTERNALS] = {
+			body,
+			stream,
+			boundary,
+			disturbed: false,
+			error: null
+		};
+		this.size = size;
+
+		if (body instanceof Stream) {
+			body.on('error', error_ => {
+				const error = error_ instanceof FetchBaseError ?
+					error_ :
+					new FetchError(`Invalid response body while trying to fetch ${this.url}: ${error_.message}`, 'system', error_);
+				this[INTERNALS].error = error;
+			});
+		}
+	}
+
+	get body() {
+		return this[INTERNALS].stream;
+	}
+
+	get bodyUsed() {
+		return this[INTERNALS].disturbed;
+	}
+
+	/**
+	 * Decode response as ArrayBuffer
+	 *
+	 * @return  Promise
+	 */
+	async arrayBuffer() {
+		const {buffer, byteOffset, byteLength} = await consumeBody(this);
+		return buffer.slice(byteOffset, byteOffset + byteLength);
+	}
+
+	async formData() {
+		const ct = this.headers.get('content-type');
+
+		if (ct.startsWith('application/x-www-form-urlencoded')) {
+			const formData = new FormData();
+			const parameters = new URLSearchParams(await this.text());
+
+			for (const [name, value] of parameters) {
+				formData.append(name, value);
+			}
+
+			return formData;
+		}
+
+		const {toFormData} = await import('./utils/multipart-parser.js');
+		return toFormData(this.body, ct);
+	}
+
+	/**
+	 * Return raw response as Blob
+	 *
+	 * @return Promise
+	 */
+	async blob() {
+		const ct = (this.headers && this.headers.get('content-type')) || (this[INTERNALS].body && this[INTERNALS].body.type) || '';
+		const buf = await this.arrayBuffer();
+
+		return new Blob([buf], {
+			type: ct
+		});
+	}
+
+	/**
+	 * Decode response as json
+	 *
+	 * @return  Promise
+	 */
+	async json() {
+		const text = await this.text();
+		return JSON.parse(text);
+	}
+
+	/**
+	 * Decode response as text
+	 *
+	 * @return  Promise
+	 */
+	async text() {
+		const buffer = await consumeBody(this);
+		return new TextDecoder().decode(buffer);
+	}
+
+	/**
+	 * Decode response as buffer (non-spec api)
+	 *
+	 * @return  Promise
+	 */
+	buffer() {
+		return consumeBody(this);
+	}
+}
+
+Body.prototype.buffer = deprecate(Body.prototype.buffer, 'Please use \'response.arrayBuffer()\' instead of \'response.buffer()\'', 'node-fetch#buffer');
+
+// In browsers, all properties are enumerable.
+Object.defineProperties(Body.prototype, {
+	body: {enumerable: true},
+	bodyUsed: {enumerable: true},
+	arrayBuffer: {enumerable: true},
+	blob: {enumerable: true},
+	json: {enumerable: true},
+	text: {enumerable: true},
+	data: {get: deprecate(() => {},
+		'data doesn\'t exist, use json(), text(), arrayBuffer(), or body instead',
+		'https://github.com/node-fetch/node-fetch/issues/1000 (response)')}
+});
+
+/**
+ * Consume and convert an entire Body to a Buffer.
+ *
+ * Ref: https://fetch.spec.whatwg.org/#concept-body-consume-body
+ *
+ * @return Promise
+ */
+async function consumeBody(data) {
+	if (data[INTERNALS].disturbed) {
+		throw new TypeError(`body used already for: ${data.url}`);
+	}
+
+	data[INTERNALS].disturbed = true;
+
+	if (data[INTERNALS].error) {
+		throw data[INTERNALS].error;
+	}
+
+	const {body} = data;
+
+	// Body is null
+	if (body === null) {
+		return Buffer.alloc(0);
+	}
+
+	/* c8 ignore next 3 */
+	if (!(body instanceof Stream)) {
+		return Buffer.alloc(0);
+	}
+
+	// Body is stream
+	// get ready to actually consume the body
+	const accum = [];
+	let accumBytes = 0;
+
+	try {
+		for await (const chunk of body) {
+			if (data.size > 0 && accumBytes + chunk.length > data.size) {
+				const error = new FetchError(`content size at ${data.url} over limit: ${data.size}`, 'max-size');
+				body.destroy(error);
+				throw error;
+			}
+
+			accumBytes += chunk.length;
+			accum.push(chunk);
+		}
+	} catch (error) {
+		const error_ = error instanceof FetchBaseError ? error : new FetchError(`Invalid response body while trying to fetch ${data.url}: ${error.message}`, 'system', error);
+		throw error_;
+	}
+
+	if (body.readableEnded === true || body._readableState.ended === true) {
+		try {
+			if (accum.every(c => typeof c === 'string')) {
+				return Buffer.from(accum.join(''));
+			}
+
+			return Buffer.concat(accum, accumBytes);
+		} catch (error) {
+			throw new FetchError(`Could not create Buffer from response body for ${data.url}: ${error.message}`, 'system', error);
+		}
+	} else {
+		throw new FetchError(`Premature close of server response while trying to fetch ${data.url}`);
+	}
+}
+
+/**
+ * Clone body given Res/Req instance
+ *
+ * @param   Mixed   instance       Response or Request instance
+ * @param   String  highWaterMark  highWaterMark for both PassThrough body streams
+ * @return  Mixed
+ */
+export const clone = (instance, highWaterMark) => {
+	let p1;
+	let p2;
+	let {body} = instance[INTERNALS];
+
+	// Don't allow cloning a used body
+	if (instance.bodyUsed) {
+		throw new Error('cannot clone body after it is used');
+	}
+
+	// Check that body is a stream and not form-data object
+	// note: we can't clone the form-data object without having it as a dependency
+	if ((body instanceof Stream) && (typeof body.getBoundary !== 'function')) {
+		// Tee instance body
+		p1 = new PassThrough({highWaterMark});
+		p2 = new PassThrough({highWaterMark});
+		body.pipe(p1);
+		body.pipe(p2);
+		// Set instance body to teed body and return the other teed body
+		instance[INTERNALS].stream = p1;
+		body = p2;
+	}
+
+	return body;
+};
+
+const getNonSpecFormDataBoundary = deprecate(
+	body => body.getBoundary(),
+	'form-data doesn\'t follow the spec and requires special treatment. Use alternative package',
+	'https://github.com/node-fetch/node-fetch/issues/1167'
+);
+
+/**
+ * Performs the operation "extract a `Content-Type` value from |object|" as
+ * specified in the specification:
+ * https://fetch.spec.whatwg.org/#concept-bodyinit-extract
+ *
+ * This function assumes that instance.body is present.
+ *
+ * @param {any} body Any options.body input
+ * @returns {string | null}
+ */
+export const extractContentType = (body, request) => {
+	// Body is null or undefined
+	if (body === null) {
+		return null;
+	}
+
+	// Body is string
+	if (typeof body === 'string') {
+		return 'text/plain;charset=UTF-8';
+	}
+
+	// Body is a URLSearchParams
+	if (isURLSearchParameters(body)) {
+		return 'application/x-www-form-urlencoded;charset=UTF-8';
+	}
+
+	// Body is blob
+	if (isBlob(body)) {
+		return body.type || null;
+	}
+
+	// Body is a Buffer (Buffer, ArrayBuffer or ArrayBufferView)
+	if (Buffer.isBuffer(body) || types.isAnyArrayBuffer(body) || ArrayBuffer.isView(body)) {
+		return null;
+	}
+
+	if (body instanceof FormData) {
+		return `multipart/form-data; boundary=${request[INTERNALS].boundary}`;
+	}
+
+	// Detect form data input from form-data module
+	if (body && typeof body.getBoundary === 'function') {
+		return `multipart/form-data;boundary=${getNonSpecFormDataBoundary(body)}`;
+	}
+
+	// Body is stream - can't really do much about this
+	if (body instanceof Stream) {
+		return null;
+	}
+
+	// Body constructor defaults other things to string
+	return 'text/plain;charset=UTF-8';
+};
+
+/**
+ * The Fetch Standard treats this as if "total bytes" is a property on the body.
+ * For us, we have to explicitly get it with a function.
+ *
+ * ref: https://fetch.spec.whatwg.org/#concept-body-total-bytes
+ *
+ * @param {any} obj.body Body object from the Body instance.
+ * @returns {number | null}
+ */
+export const getTotalBytes = request => {
+	const {body} = request[INTERNALS];
+
+	// Body is null or undefined
+	if (body === null) {
+		return 0;
+	}
+
+	// Body is Blob
+	if (isBlob(body)) {
+		return body.size;
+	}
+
+	// Body is Buffer
+	if (Buffer.isBuffer(body)) {
+		return body.length;
+	}
+
+	// Detect form data input from form-data module
+	if (body && typeof body.getLengthSync === 'function') {
+		return body.hasKnownLength && body.hasKnownLength() ? body.getLengthSync() : null;
+	}
+
+	// Body is stream
+	return null;
+};
+
+/**
+ * Write a Body to a Node.js WritableStream (e.g. http.Request) object.
+ *
+ * @param {Stream.Writable} dest The stream to write to.
+ * @param obj.body Body object from the Body instance.
+ * @returns {Promise<void>}
+ */
+export const writeToStream = async (dest, {body}) => {
+	if (body === null) {
+		// Body is null
+		dest.end();
+	} else {
+		// Body is stream
+		await pipeline(body, dest);
+	}
+};
diff --git a/node_modules/node-fetch/src/errors/abort-error.js b/node_modules/node-fetch/src/errors/abort-error.js
new file mode 100644
index 0000000..0b62f1c
--- /dev/null
+++ b/node_modules/node-fetch/src/errors/abort-error.js
@@ -0,0 +1,10 @@
+import {FetchBaseError} from './base.js';
+
+/**
+ * AbortError interface for cancelled requests
+ */
+export class AbortError extends FetchBaseError {
+	constructor(message, type = 'aborted') {
+		super(message, type);
+	}
+}
diff --git a/node_modules/node-fetch/src/errors/base.js b/node_modules/node-fetch/src/errors/base.js
new file mode 100644
index 0000000..4e66e1b
--- /dev/null
+++ b/node_modules/node-fetch/src/errors/base.js
@@ -0,0 +1,17 @@
+export class FetchBaseError extends Error {
+	constructor(message, type) {
+		super(message);
+		// Hide custom error implementation details from end-users
+		Error.captureStackTrace(this, this.constructor);
+
+		this.type = type;
+	}
+
+	get name() {
+		return this.constructor.name;
+	}
+
+	get [Symbol.toStringTag]() {
+		return this.constructor.name;
+	}
+}
diff --git a/node_modules/node-fetch/src/errors/fetch-error.js b/node_modules/node-fetch/src/errors/fetch-error.js
new file mode 100644
index 0000000..f7ae5cc
--- /dev/null
+++ b/node_modules/node-fetch/src/errors/fetch-error.js
@@ -0,0 +1,26 @@
+
+import {FetchBaseError} from './base.js';
+
+/**
+ * @typedef {{ address?: string, code: string, dest?: string, errno: number, info?: object, message: string, path?: string, port?: number, syscall: string}} SystemError
+*/
+
+/**
+ * FetchError interface for operational errors
+ */
+export class FetchError extends FetchBaseError {
+	/**
+	 * @param  {string} message -      Error message for human
+	 * @param  {string} [type] -        Error type for machine
+	 * @param  {SystemError} [systemError] - For Node.js system error
+	 */
+	constructor(message, type, systemError) {
+		super(message, type);
+		// When err.type is `system`, err.erroredSysCall contains system error and err.code contains system error code
+		if (systemError) {
+			// eslint-disable-next-line no-multi-assign
+			this.code = this.errno = systemError.code;
+			this.erroredSysCall = systemError.syscall;
+		}
+	}
+}
diff --git a/node_modules/node-fetch/src/headers.js b/node_modules/node-fetch/src/headers.js
new file mode 100644
index 0000000..cd69455
--- /dev/null
+++ b/node_modules/node-fetch/src/headers.js
@@ -0,0 +1,267 @@
+/**
+ * Headers.js
+ *
+ * Headers class offers convenient helpers
+ */
+
+import {types} from 'node:util';
+import http from 'node:http';
+
+/* c8 ignore next 9 */
+const validateHeaderName = typeof http.validateHeaderName === 'function' ?
+	http.validateHeaderName :
+	name => {
+		if (!/^[\^`\-\w!#$%&'*+.|~]+$/.test(name)) {
+			const error = new TypeError(`Header name must be a valid HTTP token [${name}]`);
+			Object.defineProperty(error, 'code', {value: 'ERR_INVALID_HTTP_TOKEN'});
+			throw error;
+		}
+	};
+
+/* c8 ignore next 9 */
+const validateHeaderValue = typeof http.validateHeaderValue === 'function' ?
+	http.validateHeaderValue :
+	(name, value) => {
+		if (/[^\t\u0020-\u007E\u0080-\u00FF]/.test(value)) {
+			const error = new TypeError(`Invalid character in header content ["${name}"]`);
+			Object.defineProperty(error, 'code', {value: 'ERR_INVALID_CHAR'});
+			throw error;
+		}
+	};
+
+/**
+ * @typedef {Headers | Record<string, string> | Iterable<readonly [string, string]> | Iterable<Iterable<string>>} HeadersInit
+ */
+
+/**
+ * This Fetch API interface allows you to perform various actions on HTTP request and response headers.
+ * These actions include retrieving, setting, adding to, and removing.
+ * A Headers object has an associated header list, which is initially empty and consists of zero or more name and value pairs.
+ * You can add to this using methods like append() (see Examples.)
+ * In all methods of this interface, header names are matched by case-insensitive byte sequence.
+ *
+ */
+export default class Headers extends URLSearchParams {
+	/**
+	 * Headers class
+	 *
+	 * @constructor
+	 * @param {HeadersInit} [init] - Response headers
+	 */
+	constructor(init) {
+		// Validate and normalize init object in [name, value(s)][]
+		/** @type {string[][]} */
+		let result = [];
+		if (init instanceof Headers) {
+			const raw = init.raw();
+			for (const [name, values] of Object.entries(raw)) {
+				result.push(...values.map(value => [name, value]));
+			}
+		} else if (init == null) { // eslint-disable-line no-eq-null, eqeqeq
+			// No op
+		} else if (typeof init === 'object' && !types.isBoxedPrimitive(init)) {
+			const method = init[Symbol.iterator];
+			// eslint-disable-next-line no-eq-null, eqeqeq
+			if (method == null) {
+				// Record<ByteString, ByteString>
+				result.push(...Object.entries(init));
+			} else {
+				if (typeof method !== 'function') {
+					throw new TypeError('Header pairs must be iterable');
+				}
+
+				// Sequence<sequence<ByteString>>
+				// Note: per spec we have to first exhaust the lists then process them
+				result = [...init]
+					.map(pair => {
+						if (
+							typeof pair !== 'object' || types.isBoxedPrimitive(pair)
+						) {
+							throw new TypeError('Each header pair must be an iterable object');
+						}
+
+						return [...pair];
+					}).map(pair => {
+						if (pair.length !== 2) {
+							throw new TypeError('Each header pair must be a name/value tuple');
+						}
+
+						return [...pair];
+					});
+			}
+		} else {
+			throw new TypeError('Failed to construct \'Headers\': The provided value is not of type \'(sequence<sequence<ByteString>> or record<ByteString, ByteString>)');
+		}
+
+		// Validate and lowercase
+		result =
+			result.length > 0 ?
+				result.map(([name, value]) => {
+					validateHeaderName(name);
+					validateHeaderValue(name, String(value));
+					return [String(name).toLowerCase(), String(value)];
+				}) :
+				undefined;
+
+		super(result);
+
+		// Returning a Proxy that will lowercase key names, validate parameters and sort keys
+		// eslint-disable-next-line no-constructor-return
+		return new Proxy(this, {
+			get(target, p, receiver) {
+				switch (p) {
+					case 'append':
+					case 'set':
+						return (name, value) => {
+							validateHeaderName(name);
+							validateHeaderValue(name, String(value));
+							return URLSearchParams.prototype[p].call(
+								target,
+								String(name).toLowerCase(),
+								String(value)
+							);
+						};
+
+					case 'delete':
+					case 'has':
+					case 'getAll':
+						return name => {
+							validateHeaderName(name);
+							return URLSearchParams.prototype[p].call(
+								target,
+								String(name).toLowerCase()
+							);
+						};
+
+					case 'keys':
+						return () => {
+							target.sort();
+							return new Set(URLSearchParams.prototype.keys.call(target)).keys();
+						};
+
+					default:
+						return Reflect.get(target, p, receiver);
+				}
+			}
+		});
+		/* c8 ignore next */
+	}
+
+	get [Symbol.toStringTag]() {
+		return this.constructor.name;
+	}
+
+	toString() {
+		return Object.prototype.toString.call(this);
+	}
+
+	get(name) {
+		const values = this.getAll(name);
+		if (values.length === 0) {
+			return null;
+		}
+
+		let value = values.join(', ');
+		if (/^content-encoding$/i.test(name)) {
+			value = value.toLowerCase();
+		}
+
+		return value;
+	}
+
+	forEach(callback, thisArg = undefined) {
+		for (const name of this.keys()) {
+			Reflect.apply(callback, thisArg, [this.get(name), name, this]);
+		}
+	}
+
+	* values() {
+		for (const name of this.keys()) {
+			yield this.get(name);
+		}
+	}
+
+	/**
+	 * @type {() => IterableIterator<[string, string]>}
+	 */
+	* entries() {
+		for (const name of this.keys()) {
+			yield [name, this.get(name)];
+		}
+	}
+
+	[Symbol.iterator]() {
+		return this.entries();
+	}
+
+	/**
+	 * Node-fetch non-spec method
+	 * returning all headers and their values as array
+	 * @returns {Record<string, string[]>}
+	 */
+	raw() {
+		return [...this.keys()].reduce((result, key) => {
+			result[key] = this.getAll(key);
+			return result;
+		}, {});
+	}
+
+	/**
+	 * For better console.log(headers) and also to convert Headers into Node.js Request compatible format
+	 */
+	[Symbol.for('nodejs.util.inspect.custom')]() {
+		return [...this.keys()].reduce((result, key) => {
+			const values = this.getAll(key);
+			// Http.request() only supports string as Host header.
+			// This hack makes specifying custom Host header possible.
+			if (key === 'host') {
+				result[key] = values[0];
+			} else {
+				result[key] = values.length > 1 ? values : values[0];
+			}
+
+			return result;
+		}, {});
+	}
+}
+
+/**
+ * Re-shaping object for Web IDL tests
+ * Only need to do it for overridden methods
+ */
+Object.defineProperties(
+	Headers.prototype,
+	['get', 'entries', 'forEach', 'values'].reduce((result, property) => {
+		result[property] = {enumerable: true};
+		return result;
+	}, {})
+);
+
+/**
+ * Create a Headers object from an http.IncomingMessage.rawHeaders, ignoring those that do
+ * not conform to HTTP grammar productions.
+ * @param {import('http').IncomingMessage['rawHeaders']} headers
+ */
+export function fromRawHeaders(headers = []) {
+	return new Headers(
+		headers
+			// Split into pairs
+			.reduce((result, value, index, array) => {
+				if (index % 2 === 0) {
+					result.push(array.slice(index, index + 2));
+				}
+
+				return result;
+			}, [])
+			.filter(([name, value]) => {
+				try {
+					validateHeaderName(name);
+					validateHeaderValue(name, String(value));
+					return true;
+				} catch {
+					return false;
+				}
+			})
+
+	);
+}
diff --git a/node_modules/node-fetch/src/index.js b/node_modules/node-fetch/src/index.js
new file mode 100644
index 0000000..7c4aee8
--- /dev/null
+++ b/node_modules/node-fetch/src/index.js
@@ -0,0 +1,417 @@
+/**
+ * Index.js
+ *
+ * a request API compatible with window.fetch
+ *
+ * All spec algorithm step numbers are based on https://fetch.spec.whatwg.org/commit-snapshots/ae716822cb3a61843226cd090eefc6589446c1d2/.
+ */
+
+import http from 'node:http';
+import https from 'node:https';
+import zlib from 'node:zlib';
+import Stream, {PassThrough, pipeline as pump} from 'node:stream';
+import {Buffer} from 'node:buffer';
+
+import dataUriToBuffer from 'data-uri-to-buffer';
+
+import {writeToStream, clone} from './body.js';
+import Response from './response.js';
+import Headers, {fromRawHeaders} from './headers.js';
+import Request, {getNodeRequestOptions} from './request.js';
+import {FetchError} from './errors/fetch-error.js';
+import {AbortError} from './errors/abort-error.js';
+import {isRedirect} from './utils/is-redirect.js';
+import {FormData} from 'formdata-polyfill/esm.min.js';
+import {isDomainOrSubdomain, isSameProtocol} from './utils/is.js';
+import {parseReferrerPolicyFromHeader} from './utils/referrer.js';
+import {
+	Blob,
+	File,
+	fileFromSync,
+	fileFrom,
+	blobFromSync,
+	blobFrom
+} from 'fetch-blob/from.js';
+
+export {FormData, Headers, Request, Response, FetchError, AbortError, isRedirect};
+export {Blob, File, fileFromSync, fileFrom, blobFromSync, blobFrom};
+
+const supportedSchemas = new Set(['data:', 'http:', 'https:']);
+
+/**
+ * Fetch function
+ *
+ * @param   {string | URL | import('./request').default} url - Absolute url or Request instance
+ * @param   {*} [options_] - Fetch options
+ * @return  {Promise<import('./response').default>}
+ */
+export default async function fetch(url, options_) {
+	return new Promise((resolve, reject) => {
+		// Build request object
+		const request = new Request(url, options_);
+		const {parsedURL, options} = getNodeRequestOptions(request);
+		if (!supportedSchemas.has(parsedURL.protocol)) {
+			throw new TypeError(`node-fetch cannot load ${url}. URL scheme "${parsedURL.protocol.replace(/:$/, '')}" is not supported.`);
+		}
+
+		if (parsedURL.protocol === 'data:') {
+			const data = dataUriToBuffer(request.url);
+			const response = new Response(data, {headers: {'Content-Type': data.typeFull}});
+			resolve(response);
+			return;
+		}
+
+		// Wrap http.request into fetch
+		const send = (parsedURL.protocol === 'https:' ? https : http).request;
+		const {signal} = request;
+		let response = null;
+
+		const abort = () => {
+			const error = new AbortError('The operation was aborted.');
+			reject(error);
+			if (request.body && request.body instanceof Stream.Readable) {
+				request.body.destroy(error);
+			}
+
+			if (!response || !response.body) {
+				return;
+			}
+
+			response.body.emit('error', error);
+		};
+
+		if (signal && signal.aborted) {
+			abort();
+			return;
+		}
+
+		const abortAndFinalize = () => {
+			abort();
+			finalize();
+		};
+
+		// Send request
+		const request_ = send(parsedURL.toString(), options);
+
+		if (signal) {
+			signal.addEventListener('abort', abortAndFinalize);
+		}
+
+		const finalize = () => {
+			request_.abort();
+			if (signal) {
+				signal.removeEventListener('abort', abortAndFinalize);
+			}
+		};
+
+		request_.on('error', error => {
+			reject(new FetchError(`request to ${request.url} failed, reason: ${error.message}`, 'system', error));
+			finalize();
+		});
+
+		fixResponseChunkedTransferBadEnding(request_, error => {
+			if (response && response.body) {
+				response.body.destroy(error);
+			}
+		});
+
+		/* c8 ignore next 18 */
+		if (process.version < 'v14') {
+			// Before Node.js 14, pipeline() does not fully support async iterators and does not always
+			// properly handle when the socket close/end events are out of order.
+			request_.on('socket', s => {
+				let endedWithEventsCount;
+				s.prependListener('end', () => {
+					endedWithEventsCount = s._eventsCount;
+				});
+				s.prependListener('close', hadError => {
+					// if end happened before close but the socket didn't emit an error, do it now
+					if (response && endedWithEventsCount < s._eventsCount && !hadError) {
+						const error = new Error('Premature close');
+						error.code = 'ERR_STREAM_PREMATURE_CLOSE';
+						response.body.emit('error', error);
+					}
+				});
+			});
+		}
+
+		request_.on('response', response_ => {
+			request_.setTimeout(0);
+			const headers = fromRawHeaders(response_.rawHeaders);
+
+			// HTTP fetch step 5
+			if (isRedirect(response_.statusCode)) {
+				// HTTP fetch step 5.2
+				const location = headers.get('Location');
+
+				// HTTP fetch step 5.3
+				let locationURL = null;
+				try {
+					locationURL = location === null ? null : new URL(location, request.url);
+				} catch {
+					// error here can only be invalid URL in Location: header
+					// do not throw when options.redirect == manual
+					// let the user extract the errorneous redirect URL
+					if (request.redirect !== 'manual') {
+						reject(new FetchError(`uri requested responds with an invalid redirect URL: ${location}`, 'invalid-redirect'));
+						finalize();
+						return;
+					}
+				}
+
+				// HTTP fetch step 5.5
+				switch (request.redirect) {
+					case 'error':
+						reject(new FetchError(`uri requested responds with a redirect, redirect mode is set to error: ${request.url}`, 'no-redirect'));
+						finalize();
+						return;
+					case 'manual':
+						// Nothing to do
+						break;
+					case 'follow': {
+						// HTTP-redirect fetch step 2
+						if (locationURL === null) {
+							break;
+						}
+
+						// HTTP-redirect fetch step 5
+						if (request.counter >= request.follow) {
+							reject(new FetchError(`maximum redirect reached at: ${request.url}`, 'max-redirect'));
+							finalize();
+							return;
+						}
+
+						// HTTP-redirect fetch step 6 (counter increment)
+						// Create a new Request object.
+						const requestOptions = {
+							headers: new Headers(request.headers),
+							follow: request.follow,
+							counter: request.counter + 1,
+							agent: request.agent,
+							compress: request.compress,
+							method: request.method,
+							body: clone(request),
+							signal: request.signal,
+							size: request.size,
+							referrer: request.referrer,
+							referrerPolicy: request.referrerPolicy
+						};
+
+						// when forwarding sensitive headers like "Authorization",
+						// "WWW-Authenticate", and "Cookie" to untrusted targets,
+						// headers will be ignored when following a redirect to a domain
+						// that is not a subdomain match or exact match of the initial domain.
+						// For example, a redirect from "foo.com" to either "foo.com" or "sub.foo.com"
+						// will forward the sensitive headers, but a redirect to "bar.com" will not.
+						// headers will also be ignored when following a redirect to a domain using
+						// a different protocol. For example, a redirect from "https://foo.com" to "http://foo.com"
+						// will not forward the sensitive headers
+						if (!isDomainOrSubdomain(request.url, locationURL) || !isSameProtocol(request.url, locationURL)) {
+							for (const name of ['authorization', 'www-authenticate', 'cookie', 'cookie2']) {
+								requestOptions.headers.delete(name);
+							}
+						}
+
+						// HTTP-redirect fetch step 9
+						if (response_.statusCode !== 303 && request.body && options_.body instanceof Stream.Readable) {
+							reject(new FetchError('Cannot follow redirect with body being a readable stream', 'unsupported-redirect'));
+							finalize();
+							return;
+						}
+
+						// HTTP-redirect fetch step 11
+						if (response_.statusCode === 303 || ((response_.statusCode === 301 || response_.statusCode === 302) && request.method === 'POST')) {
+							requestOptions.method = 'GET';
+							requestOptions.body = undefined;
+							requestOptions.headers.delete('content-length');
+						}
+
+						// HTTP-redirect fetch step 14
+						const responseReferrerPolicy = parseReferrerPolicyFromHeader(headers);
+						if (responseReferrerPolicy) {
+							requestOptions.referrerPolicy = responseReferrerPolicy;
+						}
+
+						// HTTP-redirect fetch step 15
+						resolve(fetch(new Request(locationURL, requestOptions)));
+						finalize();
+						return;
+					}
+
+					default:
+						return reject(new TypeError(`Redirect option '${request.redirect}' is not a valid value of RequestRedirect`));
+				}
+			}
+
+			// Prepare response
+			if (signal) {
+				response_.once('end', () => {
+					signal.removeEventListener('abort', abortAndFinalize);
+				});
+			}
+
+			let body = pump(response_, new PassThrough(), error => {
+				if (error) {
+					reject(error);
+				}
+			});
+			// see https://github.com/nodejs/node/pull/29376
+			/* c8 ignore next 3 */
+			if (process.version < 'v12.10') {
+				response_.on('aborted', abortAndFinalize);
+			}
+
+			const responseOptions = {
+				url: request.url,
+				status: response_.statusCode,
+				statusText: response_.statusMessage,
+				headers,
+				size: request.size,
+				counter: request.counter,
+				highWaterMark: request.highWaterMark
+			};
+
+			// HTTP-network fetch step 12.1.1.3
+			const codings = headers.get('Content-Encoding');
+
+			// HTTP-network fetch step 12.1.1.4: handle content codings
+
+			// in following scenarios we ignore compression support
+			// 1. compression support is disabled
+			// 2. HEAD request
+			// 3. no Content-Encoding header
+			// 4. no content response (204)
+			// 5. content not modified response (304)
+			if (!request.compress || request.method === 'HEAD' || codings === null || response_.statusCode === 204 || response_.statusCode === 304) {
+				response = new Response(body, responseOptions);
+				resolve(response);
+				return;
+			}
+
+			// For Node v6+
+			// Be less strict when decoding compressed responses, since sometimes
+			// servers send slightly invalid responses that are still accepted
+			// by common browsers.
+			// Always using Z_SYNC_FLUSH is what cURL does.
+			const zlibOptions = {
+				flush: zlib.Z_SYNC_FLUSH,
+				finishFlush: zlib.Z_SYNC_FLUSH
+			};
+
+			// For gzip
+			if (codings === 'gzip' || codings === 'x-gzip') {
+				body = pump(body, zlib.createGunzip(zlibOptions), error => {
+					if (error) {
+						reject(error);
+					}
+				});
+				response = new Response(body, responseOptions);
+				resolve(response);
+				return;
+			}
+
+			// For deflate
+			if (codings === 'deflate' || codings === 'x-deflate') {
+				// Handle the infamous raw deflate response from old servers
+				// a hack for old IIS and Apache servers
+				const raw = pump(response_, new PassThrough(), error => {
+					if (error) {
+						reject(error);
+					}
+				});
+				raw.once('data', chunk => {
+					// See http://stackoverflow.com/questions/37519828
+					if ((chunk[0] & 0x0F) === 0x08) {
+						body = pump(body, zlib.createInflate(), error => {
+							if (error) {
+								reject(error);
+							}
+						});
+					} else {
+						body = pump(body, zlib.createInflateRaw(), error => {
+							if (error) {
+								reject(error);
+							}
+						});
+					}
+
+					response = new Response(body, responseOptions);
+					resolve(response);
+				});
+				raw.once('end', () => {
+					// Some old IIS servers return zero-length OK deflate responses, so
+					// 'data' is never emitted. See https://github.com/node-fetch/node-fetch/pull/903
+					if (!response) {
+						response = new Response(body, responseOptions);
+						resolve(response);
+					}
+				});
+				return;
+			}
+
+			// For br
+			if (codings === 'br') {
+				body = pump(body, zlib.createBrotliDecompress(), error => {
+					if (error) {
+						reject(error);
+					}
+				});
+				response = new Response(body, responseOptions);
+				resolve(response);
+				return;
+			}
+
+			// Otherwise, use response as-is
+			response = new Response(body, responseOptions);
+			resolve(response);
+		});
+
+		// eslint-disable-next-line promise/prefer-await-to-then
+		writeToStream(request_, request).catch(reject);
+	});
+}
+
+function fixResponseChunkedTransferBadEnding(request, errorCallback) {
+	const LAST_CHUNK = Buffer.from('0\r\n\r\n');
+
+	let isChunkedTransfer = false;
+	let properLastChunkReceived = false;
+	let previousChunk;
+
+	request.on('response', response => {
+		const {headers} = response;
+		isChunkedTransfer = headers['transfer-encoding'] === 'chunked' && !headers['content-length'];
+	});
+
+	request.on('socket', socket => {
+		const onSocketClose = () => {
+			if (isChunkedTransfer && !properLastChunkReceived) {
+				const error = new Error('Premature close');
+				error.code = 'ERR_STREAM_PREMATURE_CLOSE';
+				errorCallback(error);
+			}
+		};
+
+		const onData = buf => {
+			properLastChunkReceived = Buffer.compare(buf.slice(-5), LAST_CHUNK) === 0;
+
+			// Sometimes final 0-length chunk and end of message code are in separate packets
+			if (!properLastChunkReceived && previousChunk) {
+				properLastChunkReceived = (
+					Buffer.compare(previousChunk.slice(-3), LAST_CHUNK.slice(0, 3)) === 0 &&
+					Buffer.compare(buf.slice(-2), LAST_CHUNK.slice(3)) === 0
+				);
+			}
+
+			previousChunk = buf;
+		};
+
+		socket.prependListener('close', onSocketClose);
+		socket.on('data', onData);
+
+		request.on('close', () => {
+			socket.removeListener('close', onSocketClose);
+			socket.removeListener('data', onData);
+		});
+	});
+}
diff --git a/node_modules/node-fetch/src/request.js b/node_modules/node-fetch/src/request.js
new file mode 100644
index 0000000..af2ebc8
--- /dev/null
+++ b/node_modules/node-fetch/src/request.js
@@ -0,0 +1,313 @@
+/**
+ * Request.js
+ *
+ * Request class contains server only options
+ *
+ * All spec algorithm step numbers are based on https://fetch.spec.whatwg.org/commit-snapshots/ae716822cb3a61843226cd090eefc6589446c1d2/.
+ */
+
+import {format as formatUrl} from 'node:url';
+import {deprecate} from 'node:util';
+import Headers from './headers.js';
+import Body, {clone, extractContentType, getTotalBytes} from './body.js';
+import {isAbortSignal} from './utils/is.js';
+import {getSearch} from './utils/get-search.js';
+import {
+	validateReferrerPolicy, determineRequestsReferrer, DEFAULT_REFERRER_POLICY
+} from './utils/referrer.js';
+
+const INTERNALS = Symbol('Request internals');
+
+/**
+ * Check if `obj` is an instance of Request.
+ *
+ * @param  {*} object
+ * @return {boolean}
+ */
+const isRequest = object => {
+	return (
+		typeof object === 'object' &&
+		typeof object[INTERNALS] === 'object'
+	);
+};
+
+const doBadDataWarn = deprecate(() => {},
+	'.data is not a valid RequestInit property, use .body instead',
+	'https://github.com/node-fetch/node-fetch/issues/1000 (request)');
+
+/**
+ * Request class
+ *
+ * Ref: https://fetch.spec.whatwg.org/#request-class
+ *
+ * @param   Mixed   input  Url or Request instance
+ * @param   Object  init   Custom options
+ * @return  Void
+ */
+export default class Request extends Body {
+	constructor(input, init = {}) {
+		let parsedURL;
+
+		// Normalize input and force URL to be encoded as UTF-8 (https://github.com/node-fetch/node-fetch/issues/245)
+		if (isRequest(input)) {
+			parsedURL = new URL(input.url);
+		} else {
+			parsedURL = new URL(input);
+			input = {};
+		}
+
+		if (parsedURL.username !== '' || parsedURL.password !== '') {
+			throw new TypeError(`${parsedURL} is an url with embedded credentials.`);
+		}
+
+		let method = init.method || input.method || 'GET';
+		if (/^(delete|get|head|options|post|put)$/i.test(method)) {
+			method = method.toUpperCase();
+		}
+
+		if (!isRequest(init) && 'data' in init) {
+			doBadDataWarn();
+		}
+
+		// eslint-disable-next-line no-eq-null, eqeqeq
+		if ((init.body != null || (isRequest(input) && input.body !== null)) &&
+			(method === 'GET' || method === 'HEAD')) {
+			throw new TypeError('Request with GET/HEAD method cannot have body');
+		}
+
+		const inputBody = init.body ?
+			init.body :
+			(isRequest(input) && input.body !== null ?
+				clone(input) :
+				null);
+
+		super(inputBody, {
+			size: init.size || input.size || 0
+		});
+
+		const headers = new Headers(init.headers || input.headers || {});
+
+		if (inputBody !== null && !headers.has('Content-Type')) {
+			const contentType = extractContentType(inputBody, this);
+			if (contentType) {
+				headers.set('Content-Type', contentType);
+			}
+		}
+
+		let signal = isRequest(input) ?
+			input.signal :
+			null;
+		if ('signal' in init) {
+			signal = init.signal;
+		}
+
+		// eslint-disable-next-line no-eq-null, eqeqeq
+		if (signal != null && !isAbortSignal(signal)) {
+			throw new TypeError('Expected signal to be an instanceof AbortSignal or EventTarget');
+		}
+
+		// §5.4, Request constructor steps, step 15.1
+		// eslint-disable-next-line no-eq-null, eqeqeq
+		let referrer = init.referrer == null ? input.referrer : init.referrer;
+		if (referrer === '') {
+			// §5.4, Request constructor steps, step 15.2
+			referrer = 'no-referrer';
+		} else if (referrer) {
+			// §5.4, Request constructor steps, step 15.3.1, 15.3.2
+			const parsedReferrer = new URL(referrer);
+			// §5.4, Request constructor steps, step 15.3.3, 15.3.4
+			referrer = /^about:(\/\/)?client$/.test(parsedReferrer) ? 'client' : parsedReferrer;
+		} else {
+			referrer = undefined;
+		}
+
+		this[INTERNALS] = {
+			method,
+			redirect: init.redirect || input.redirect || 'follow',
+			headers,
+			parsedURL,
+			signal,
+			referrer
+		};
+
+		// Node-fetch-only options
+		this.follow = init.follow === undefined ? (input.follow === undefined ? 20 : input.follow) : init.follow;
+		this.compress = init.compress === undefined ? (input.compress === undefined ? true : input.compress) : init.compress;
+		this.counter = init.counter || input.counter || 0;
+		this.agent = init.agent || input.agent;
+		this.highWaterMark = init.highWaterMark || input.highWaterMark || 16384;
+		this.insecureHTTPParser = init.insecureHTTPParser || input.insecureHTTPParser || false;
+
+		// §5.4, Request constructor steps, step 16.
+		// Default is empty string per https://fetch.spec.whatwg.org/#concept-request-referrer-policy
+		this.referrerPolicy = init.referrerPolicy || input.referrerPolicy || '';
+	}
+
+	/** @returns {string} */
+	get method() {
+		return this[INTERNALS].method;
+	}
+
+	/** @returns {string} */
+	get url() {
+		return formatUrl(this[INTERNALS].parsedURL);
+	}
+
+	/** @returns {Headers} */
+	get headers() {
+		return this[INTERNALS].headers;
+	}
+
+	get redirect() {
+		return this[INTERNALS].redirect;
+	}
+
+	/** @returns {AbortSignal} */
+	get signal() {
+		return this[INTERNALS].signal;
+	}
+
+	// https://fetch.spec.whatwg.org/#dom-request-referrer
+	get referrer() {
+		if (this[INTERNALS].referrer === 'no-referrer') {
+			return '';
+		}
+
+		if (this[INTERNALS].referrer === 'client') {
+			return 'about:client';
+		}
+
+		if (this[INTERNALS].referrer) {
+			return this[INTERNALS].referrer.toString();
+		}
+
+		return undefined;
+	}
+
+	get referrerPolicy() {
+		return this[INTERNALS].referrerPolicy;
+	}
+
+	set referrerPolicy(referrerPolicy) {
+		this[INTERNALS].referrerPolicy = validateReferrerPolicy(referrerPolicy);
+	}
+
+	/**
+	 * Clone this request
+	 *
+	 * @return  Request
+	 */
+	clone() {
+		return new Request(this);
+	}
+
+	get [Symbol.toStringTag]() {
+		return 'Request';
+	}
+}
+
+Object.defineProperties(Request.prototype, {
+	method: {enumerable: true},
+	url: {enumerable: true},
+	headers: {enumerable: true},
+	redirect: {enumerable: true},
+	clone: {enumerable: true},
+	signal: {enumerable: true},
+	referrer: {enumerable: true},
+	referrerPolicy: {enumerable: true}
+});
+
+/**
+ * Convert a Request to Node.js http request options.
+ *
+ * @param {Request} request - A Request instance
+ * @return The options object to be passed to http.request
+ */
+export const getNodeRequestOptions = request => {
+	const {parsedURL} = request[INTERNALS];
+	const headers = new Headers(request[INTERNALS].headers);
+
+	// Fetch step 1.3
+	if (!headers.has('Accept')) {
+		headers.set('Accept', '*/*');
+	}
+
+	// HTTP-network-or-cache fetch steps 2.4-2.7
+	let contentLengthValue = null;
+	if (request.body === null && /^(post|put)$/i.test(request.method)) {
+		contentLengthValue = '0';
+	}
+
+	if (request.body !== null) {
+		const totalBytes = getTotalBytes(request);
+		// Set Content-Length if totalBytes is a number (that is not NaN)
+		if (typeof totalBytes === 'number' && !Number.isNaN(totalBytes)) {
+			contentLengthValue = String(totalBytes);
+		}
+	}
+
+	if (contentLengthValue) {
+		headers.set('Content-Length', contentLengthValue);
+	}
+
+	// 4.1. Main fetch, step 2.6
+	// > If request's referrer policy is the empty string, then set request's referrer policy to the
+	// > default referrer policy.
+	if (request.referrerPolicy === '') {
+		request.referrerPolicy = DEFAULT_REFERRER_POLICY;
+	}
+
+	// 4.1. Main fetch, step 2.7
+	// > If request's referrer is not "no-referrer", set request's referrer to the result of invoking
+	// > determine request's referrer.
+	if (request.referrer && request.referrer !== 'no-referrer') {
+		request[INTERNALS].referrer = determineRequestsReferrer(request);
+	} else {
+		request[INTERNALS].referrer = 'no-referrer';
+	}
+
+	// 4.5. HTTP-network-or-cache fetch, step 6.9
+	// > If httpRequest's referrer is a URL, then append `Referer`/httpRequest's referrer, serialized
+	// >  and isomorphic encoded, to httpRequest's header list.
+	if (request[INTERNALS].referrer instanceof URL) {
+		headers.set('Referer', request.referrer);
+	}
+
+	// HTTP-network-or-cache fetch step 2.11
+	if (!headers.has('User-Agent')) {
+		headers.set('User-Agent', 'node-fetch');
+	}
+
+	// HTTP-network-or-cache fetch step 2.15
+	if (request.compress && !headers.has('Accept-Encoding')) {
+		headers.set('Accept-Encoding', 'gzip, deflate, br');
+	}
+
+	let {agent} = request;
+	if (typeof agent === 'function') {
+		agent = agent(parsedURL);
+	}
+
+	// HTTP-network fetch step 4.2
+	// chunked encoding is handled by Node.js
+
+	const search = getSearch(parsedURL);
+
+	// Pass the full URL directly to request(), but overwrite the following
+	// options:
+	const options = {
+		// Overwrite search to retain trailing ? (issue #776)
+		path: parsedURL.pathname + search,
+		// The following options are not expressed in the URL
+		method: request.method,
+		headers: headers[Symbol.for('nodejs.util.inspect.custom')](),
+		insecureHTTPParser: request.insecureHTTPParser,
+		agent
+	};
+
+	return {
+		/** @type {URL} */
+		parsedURL,
+		options
+	};
+};
diff --git a/node_modules/node-fetch/src/response.js b/node_modules/node-fetch/src/response.js
new file mode 100644
index 0000000..9806c0c
--- /dev/null
+++ b/node_modules/node-fetch/src/response.js
@@ -0,0 +1,160 @@
+/**
+ * Response.js
+ *
+ * Response class provides content decoding
+ */
+
+import Headers from './headers.js';
+import Body, {clone, extractContentType} from './body.js';
+import {isRedirect} from './utils/is-redirect.js';
+
+const INTERNALS = Symbol('Response internals');
+
+/**
+ * Response class
+ *
+ * Ref: https://fetch.spec.whatwg.org/#response-class
+ *
+ * @param   Stream  body  Readable stream
+ * @param   Object  opts  Response options
+ * @return  Void
+ */
+export default class Response extends Body {
+	constructor(body = null, options = {}) {
+		super(body, options);
+
+		// eslint-disable-next-line no-eq-null, eqeqeq, no-negated-condition
+		const status = options.status != null ? options.status : 200;
+
+		const headers = new Headers(options.headers);
+
+		if (body !== null && !headers.has('Content-Type')) {
+			const contentType = extractContentType(body, this);
+			if (contentType) {
+				headers.append('Content-Type', contentType);
+			}
+		}
+
+		this[INTERNALS] = {
+			type: 'default',
+			url: options.url,
+			status,
+			statusText: options.statusText || '',
+			headers,
+			counter: options.counter,
+			highWaterMark: options.highWaterMark
+		};
+	}
+
+	get type() {
+		return this[INTERNALS].type;
+	}
+
+	get url() {
+		return this[INTERNALS].url || '';
+	}
+
+	get status() {
+		return this[INTERNALS].status;
+	}
+
+	/**
+	 * Convenience property representing if the request ended normally
+	 */
+	get ok() {
+		return this[INTERNALS].status >= 200 && this[INTERNALS].status < 300;
+	}
+
+	get redirected() {
+		return this[INTERNALS].counter > 0;
+	}
+
+	get statusText() {
+		return this[INTERNALS].statusText;
+	}
+
+	get headers() {
+		return this[INTERNALS].headers;
+	}
+
+	get highWaterMark() {
+		return this[INTERNALS].highWaterMark;
+	}
+
+	/**
+	 * Clone this response
+	 *
+	 * @return  Response
+	 */
+	clone() {
+		return new Response(clone(this, this.highWaterMark), {
+			type: this.type,
+			url: this.url,
+			status: this.status,
+			statusText: this.statusText,
+			headers: this.headers,
+			ok: this.ok,
+			redirected: this.redirected,
+			size: this.size,
+			highWaterMark: this.highWaterMark
+		});
+	}
+
+	/**
+	 * @param {string} url    The URL that the new response is to originate from.
+	 * @param {number} status An optional status code for the response (e.g., 302.)
+	 * @returns {Response}    A Response object.
+	 */
+	static redirect(url, status = 302) {
+		if (!isRedirect(status)) {
+			throw new RangeError('Failed to execute "redirect" on "response": Invalid status code');
+		}
+
+		return new Response(null, {
+			headers: {
+				location: new URL(url).toString()
+			},
+			status
+		});
+	}
+
+	static error() {
+		const response = new Response(null, {status: 0, statusText: ''});
+		response[INTERNALS].type = 'error';
+		return response;
+	}
+
+	static json(data = undefined, init = {}) {
+		const body = JSON.stringify(data);
+
+		if (body === undefined) {
+			throw new TypeError('data is not JSON serializable');
+		}
+
+		const headers = new Headers(init && init.headers);
+
+		if (!headers.has('content-type')) {
+			headers.set('content-type', 'application/json');
+		}
+
+		return new Response(body, {
+			...init,
+			headers
+		});
+	}
+
+	get [Symbol.toStringTag]() {
+		return 'Response';
+	}
+}
+
+Object.defineProperties(Response.prototype, {
+	type: {enumerable: true},
+	url: {enumerable: true},
+	status: {enumerable: true},
+	ok: {enumerable: true},
+	redirected: {enumerable: true},
+	statusText: {enumerable: true},
+	headers: {enumerable: true},
+	clone: {enumerable: true}
+});
diff --git a/node_modules/node-fetch/src/utils/get-search.js b/node_modules/node-fetch/src/utils/get-search.js
new file mode 100644
index 0000000..d067e7c
--- /dev/null
+++ b/node_modules/node-fetch/src/utils/get-search.js
@@ -0,0 +1,9 @@
+export const getSearch = parsedURL => {
+	if (parsedURL.search) {
+		return parsedURL.search;
+	}
+
+	const lastOffset = parsedURL.href.length - 1;
+	const hash = parsedURL.hash || (parsedURL.href[lastOffset] === '#' ? '#' : '');
+	return parsedURL.href[lastOffset - hash.length] === '?' ? '?' : '';
+};
diff --git a/node_modules/node-fetch/src/utils/is-redirect.js b/node_modules/node-fetch/src/utils/is-redirect.js
new file mode 100644
index 0000000..d1347f0
--- /dev/null
+++ b/node_modules/node-fetch/src/utils/is-redirect.js
@@ -0,0 +1,11 @@
+const redirectStatus = new Set([301, 302, 303, 307, 308]);
+
+/**
+ * Redirect code matching
+ *
+ * @param {number} code - Status code
+ * @return {boolean}
+ */
+export const isRedirect = code => {
+	return redirectStatus.has(code);
+};
diff --git a/node_modules/node-fetch/src/utils/is.js b/node_modules/node-fetch/src/utils/is.js
new file mode 100644
index 0000000..f9e467e
--- /dev/null
+++ b/node_modules/node-fetch/src/utils/is.js
@@ -0,0 +1,87 @@
+/**
+ * Is.js
+ *
+ * Object type checks.
+ */
+
+const NAME = Symbol.toStringTag;
+
+/**
+ * Check if `obj` is a URLSearchParams object
+ * ref: https://github.com/node-fetch/node-fetch/issues/296#issuecomment-307598143
+ * @param {*} object - Object to check for
+ * @return {boolean}
+ */
+export const isURLSearchParameters = object => {
+	return (
+		typeof object === 'object' &&
+		typeof object.append === 'function' &&
+		typeof object.delete === 'function' &&
+		typeof object.get === 'function' &&
+		typeof object.getAll === 'function' &&
+		typeof object.has === 'function' &&
+		typeof object.set === 'function' &&
+		typeof object.sort === 'function' &&
+		object[NAME] === 'URLSearchParams'
+	);
+};
+
+/**
+ * Check if `object` is a W3C `Blob` object (which `File` inherits from)
+ * @param {*} object - Object to check for
+ * @return {boolean}
+ */
+export const isBlob = object => {
+	return (
+		object &&
+		typeof object === 'object' &&
+		typeof object.arrayBuffer === 'function' &&
+		typeof object.type === 'string' &&
+		typeof object.stream === 'function' &&
+		typeof object.constructor === 'function' &&
+		/^(Blob|File)$/.test(object[NAME])
+	);
+};
+
+/**
+ * Check if `obj` is an instance of AbortSignal.
+ * @param {*} object - Object to check for
+ * @return {boolean}
+ */
+export const isAbortSignal = object => {
+	return (
+		typeof object === 'object' && (
+			object[NAME] === 'AbortSignal' ||
+			object[NAME] === 'EventTarget'
+		)
+	);
+};
+
+/**
+ * isDomainOrSubdomain reports whether sub is a subdomain (or exact match) of
+ * the parent domain.
+ *
+ * Both domains must already be in canonical form.
+ * @param {string|URL} original
+ * @param {string|URL} destination
+ */
+export const isDomainOrSubdomain = (destination, original) => {
+	const orig = new URL(original).hostname;
+	const dest = new URL(destination).hostname;
+
+	return orig === dest || orig.endsWith(`.${dest}`);
+};
+
+/**
+ * isSameProtocol reports whether the two provided URLs use the same protocol.
+ *
+ * Both domains must already be in canonical form.
+ * @param {string|URL} original
+ * @param {string|URL} destination
+ */
+export const isSameProtocol = (destination, original) => {
+	const orig = new URL(original).protocol;
+	const dest = new URL(destination).protocol;
+
+	return orig === dest;
+};
diff --git a/node_modules/node-fetch/src/utils/multipart-parser.js b/node_modules/node-fetch/src/utils/multipart-parser.js
new file mode 100644
index 0000000..5ad06f9
--- /dev/null
+++ b/node_modules/node-fetch/src/utils/multipart-parser.js
@@ -0,0 +1,432 @@
+import {File} from 'fetch-blob/from.js';
+import {FormData} from 'formdata-polyfill/esm.min.js';
+
+let s = 0;
+const S = {
+	START_BOUNDARY: s++,
+	HEADER_FIELD_START: s++,
+	HEADER_FIELD: s++,
+	HEADER_VALUE_START: s++,
+	HEADER_VALUE: s++,
+	HEADER_VALUE_ALMOST_DONE: s++,
+	HEADERS_ALMOST_DONE: s++,
+	PART_DATA_START: s++,
+	PART_DATA: s++,
+	END: s++
+};
+
+let f = 1;
+const F = {
+	PART_BOUNDARY: f,
+	LAST_BOUNDARY: f *= 2
+};
+
+const LF = 10;
+const CR = 13;
+const SPACE = 32;
+const HYPHEN = 45;
+const COLON = 58;
+const A = 97;
+const Z = 122;
+
+const lower = c => c | 0x20;
+
+const noop = () => {};
+
+class MultipartParser {
+	/**
+	 * @param {string} boundary
+	 */
+	constructor(boundary) {
+		this.index = 0;
+		this.flags = 0;
+
+		this.onHeaderEnd = noop;
+		this.onHeaderField = noop;
+		this.onHeadersEnd = noop;
+		this.onHeaderValue = noop;
+		this.onPartBegin = noop;
+		this.onPartData = noop;
+		this.onPartEnd = noop;
+
+		this.boundaryChars = {};
+
+		boundary = '\r\n--' + boundary;
+		const ui8a = new Uint8Array(boundary.length);
+		for (let i = 0; i < boundary.length; i++) {
+			ui8a[i] = boundary.charCodeAt(i);
+			this.boundaryChars[ui8a[i]] = true;
+		}
+
+		this.boundary = ui8a;
+		this.lookbehind = new Uint8Array(this.boundary.length + 8);
+		this.state = S.START_BOUNDARY;
+	}
+
+	/**
+	 * @param {Uint8Array} data
+	 */
+	write(data) {
+		let i = 0;
+		const length_ = data.length;
+		let previousIndex = this.index;
+		let {lookbehind, boundary, boundaryChars, index, state, flags} = this;
+		const boundaryLength = this.boundary.length;
+		const boundaryEnd = boundaryLength - 1;
+		const bufferLength = data.length;
+		let c;
+		let cl;
+
+		const mark = name => {
+			this[name + 'Mark'] = i;
+		};
+
+		const clear = name => {
+			delete this[name + 'Mark'];
+		};
+
+		const callback = (callbackSymbol, start, end, ui8a) => {
+			if (start === undefined || start !== end) {
+				this[callbackSymbol](ui8a && ui8a.subarray(start, end));
+			}
+		};
+
+		const dataCallback = (name, clear) => {
+			const markSymbol = name + 'Mark';
+			if (!(markSymbol in this)) {
+				return;
+			}
+
+			if (clear) {
+				callback(name, this[markSymbol], i, data);
+				delete this[markSymbol];
+			} else {
+				callback(name, this[markSymbol], data.length, data);
+				this[markSymbol] = 0;
+			}
+		};
+
+		for (i = 0; i < length_; i++) {
+			c = data[i];
+
+			switch (state) {
+				case S.START_BOUNDARY:
+					if (index === boundary.length - 2) {
+						if (c === HYPHEN) {
+							flags |= F.LAST_BOUNDARY;
+						} else if (c !== CR) {
+							return;
+						}
+
+						index++;
+						break;
+					} else if (index - 1 === boundary.length - 2) {
+						if (flags & F.LAST_BOUNDARY && c === HYPHEN) {
+							state = S.END;
+							flags = 0;
+						} else if (!(flags & F.LAST_BOUNDARY) && c === LF) {
+							index = 0;
+							callback('onPartBegin');
+							state = S.HEADER_FIELD_START;
+						} else {
+							return;
+						}
+
+						break;
+					}
+
+					if (c !== boundary[index + 2]) {
+						index = -2;
+					}
+
+					if (c === boundary[index + 2]) {
+						index++;
+					}
+
+					break;
+				case S.HEADER_FIELD_START:
+					state = S.HEADER_FIELD;
+					mark('onHeaderField');
+					index = 0;
+					// falls through
+				case S.HEADER_FIELD:
+					if (c === CR) {
+						clear('onHeaderField');
+						state = S.HEADERS_ALMOST_DONE;
+						break;
+					}
+
+					index++;
+					if (c === HYPHEN) {
+						break;
+					}
+
+					if (c === COLON) {
+						if (index === 1) {
+							// empty header field
+							return;
+						}
+
+						dataCallback('onHeaderField', true);
+						state = S.HEADER_VALUE_START;
+						break;
+					}
+
+					cl = lower(c);
+					if (cl < A || cl > Z) {
+						return;
+					}
+
+					break;
+				case S.HEADER_VALUE_START:
+					if (c === SPACE) {
+						break;
+					}
+
+					mark('onHeaderValue');
+					state = S.HEADER_VALUE;
+					// falls through
+				case S.HEADER_VALUE:
+					if (c === CR) {
+						dataCallback('onHeaderValue', true);
+						callback('onHeaderEnd');
+						state = S.HEADER_VALUE_ALMOST_DONE;
+					}
+
+					break;
+				case S.HEADER_VALUE_ALMOST_DONE:
+					if (c !== LF) {
+						return;
+					}
+
+					state = S.HEADER_FIELD_START;
+					break;
+				case S.HEADERS_ALMOST_DONE:
+					if (c !== LF) {
+						return;
+					}
+
+					callback('onHeadersEnd');
+					state = S.PART_DATA_START;
+					break;
+				case S.PART_DATA_START:
+					state = S.PART_DATA;
+					mark('onPartData');
+					// falls through
+				case S.PART_DATA:
+					previousIndex = index;
+
+					if (index === 0) {
+						// boyer-moore derrived algorithm to safely skip non-boundary data
+						i += boundaryEnd;
+						while (i < bufferLength && !(data[i] in boundaryChars)) {
+							i += boundaryLength;
+						}
+
+						i -= boundaryEnd;
+						c = data[i];
+					}
+
+					if (index < boundary.length) {
+						if (boundary[index] === c) {
+							if (index === 0) {
+								dataCallback('onPartData', true);
+							}
+
+							index++;
+						} else {
+							index = 0;
+						}
+					} else if (index === boundary.length) {
+						index++;
+						if (c === CR) {
+							// CR = part boundary
+							flags |= F.PART_BOUNDARY;
+						} else if (c === HYPHEN) {
+							// HYPHEN = end boundary
+							flags |= F.LAST_BOUNDARY;
+						} else {
+							index = 0;
+						}
+					} else if (index - 1 === boundary.length) {
+						if (flags & F.PART_BOUNDARY) {
+							index = 0;
+							if (c === LF) {
+								// unset the PART_BOUNDARY flag
+								flags &= ~F.PART_BOUNDARY;
+								callback('onPartEnd');
+								callback('onPartBegin');
+								state = S.HEADER_FIELD_START;
+								break;
+							}
+						} else if (flags & F.LAST_BOUNDARY) {
+							if (c === HYPHEN) {
+								callback('onPartEnd');
+								state = S.END;
+								flags = 0;
+							} else {
+								index = 0;
+							}
+						} else {
+							index = 0;
+						}
+					}
+
+					if (index > 0) {
+						// when matching a possible boundary, keep a lookbehind reference
+						// in case it turns out to be a false lead
+						lookbehind[index - 1] = c;
+					} else if (previousIndex > 0) {
+						// if our boundary turned out to be rubbish, the captured lookbehind
+						// belongs to partData
+						const _lookbehind = new Uint8Array(lookbehind.buffer, lookbehind.byteOffset, lookbehind.byteLength);
+						callback('onPartData', 0, previousIndex, _lookbehind);
+						previousIndex = 0;
+						mark('onPartData');
+
+						// reconsider the current character even so it interrupted the sequence
+						// it could be the beginning of a new sequence
+						i--;
+					}
+
+					break;
+				case S.END:
+					break;
+				default:
+					throw new Error(`Unexpected state entered: ${state}`);
+			}
+		}
+
+		dataCallback('onHeaderField');
+		dataCallback('onHeaderValue');
+		dataCallback('onPartData');
+
+		// Update properties for the next call
+		this.index = index;
+		this.state = state;
+		this.flags = flags;
+	}
+
+	end() {
+		if ((this.state === S.HEADER_FIELD_START && this.index === 0) ||
+			(this.state === S.PART_DATA && this.index === this.boundary.length)) {
+			this.onPartEnd();
+		} else if (this.state !== S.END) {
+			throw new Error('MultipartParser.end(): stream ended unexpectedly');
+		}
+	}
+}
+
+function _fileName(headerValue) {
+	// matches either a quoted-string or a token (RFC 2616 section 19.5.1)
+	const m = headerValue.match(/\bfilename=("(.*?)"|([^()<>@,;:\\"/[\]?={}\s\t]+))($|;\s)/i);
+	if (!m) {
+		return;
+	}
+
+	const match = m[2] || m[3] || '';
+	let filename = match.slice(match.lastIndexOf('\\') + 1);
+	filename = filename.replace(/%22/g, '"');
+	filename = filename.replace(/&#(\d{4});/g, (m, code) => {
+		return String.fromCharCode(code);
+	});
+	return filename;
+}
+
+export async function toFormData(Body, ct) {
+	if (!/multipart/i.test(ct)) {
+		throw new TypeError('Failed to fetch');
+	}
+
+	const m = ct.match(/boundary=(?:"([^"]+)"|([^;]+))/i);
+
+	if (!m) {
+		throw new TypeError('no or bad content-type header, no multipart boundary');
+	}
+
+	const parser = new MultipartParser(m[1] || m[2]);
+
+	let headerField;
+	let headerValue;
+	let entryValue;
+	let entryName;
+	let contentType;
+	let filename;
+	const entryChunks = [];
+	const formData = new FormData();
+
+	const onPartData = ui8a => {
+		entryValue += decoder.decode(ui8a, {stream: true});
+	};
+
+	const appendToFile = ui8a => {
+		entryChunks.push(ui8a);
+	};
+
+	const appendFileToFormData = () => {
+		const file = new File(entryChunks, filename, {type: contentType});
+		formData.append(entryName, file);
+	};
+
+	const appendEntryToFormData = () => {
+		formData.append(entryName, entryValue);
+	};
+
+	const decoder = new TextDecoder('utf-8');
+	decoder.decode();
+
+	parser.onPartBegin = function () {
+		parser.onPartData = onPartData;
+		parser.onPartEnd = appendEntryToFormData;
+
+		headerField = '';
+		headerValue = '';
+		entryValue = '';
+		entryName = '';
+		contentType = '';
+		filename = null;
+		entryChunks.length = 0;
+	};
+
+	parser.onHeaderField = function (ui8a) {
+		headerField += decoder.decode(ui8a, {stream: true});
+	};
+
+	parser.onHeaderValue = function (ui8a) {
+		headerValue += decoder.decode(ui8a, {stream: true});
+	};
+
+	parser.onHeaderEnd = function () {
+		headerValue += decoder.decode();
+		headerField = headerField.toLowerCase();
+
+		if (headerField === 'content-disposition') {
+			// matches either a quoted-string or a token (RFC 2616 section 19.5.1)
+			const m = headerValue.match(/\bname=("([^"]*)"|([^()<>@,;:\\"/[\]?={}\s\t]+))/i);
+
+			if (m) {
+				entryName = m[2] || m[3] || '';
+			}
+
+			filename = _fileName(headerValue);
+
+			if (filename) {
+				parser.onPartData = appendToFile;
+				parser.onPartEnd = appendFileToFormData;
+			}
+		} else if (headerField === 'content-type') {
+			contentType = headerValue;
+		}
+
+		headerValue = '';
+		headerField = '';
+	};
+
+	for await (const chunk of Body) {
+		parser.write(chunk);
+	}
+
+	parser.end();
+
+	return formData;
+}
diff --git a/node_modules/node-fetch/src/utils/referrer.js b/node_modules/node-fetch/src/utils/referrer.js
new file mode 100644
index 0000000..6741f2f
--- /dev/null
+++ b/node_modules/node-fetch/src/utils/referrer.js
@@ -0,0 +1,340 @@
+import {isIP} from 'node:net';
+
+/**
+ * @external URL
+ * @see {@link https://developer.mozilla.org/en-US/docs/Web/API/URL|URL}
+ */
+
+/**
+ * @module utils/referrer
+ * @private
+ */
+
+/**
+ * @see {@link https://w3c.github.io/webappsec-referrer-policy/#strip-url|Referrer Policy §8.4. Strip url for use as a referrer}
+ * @param {string} URL
+ * @param {boolean} [originOnly=false]
+ */
+export function stripURLForUseAsAReferrer(url, originOnly = false) {
+	// 1. If url is null, return no referrer.
+	if (url == null) { // eslint-disable-line no-eq-null, eqeqeq
+		return 'no-referrer';
+	}
+
+	url = new URL(url);
+
+	// 2. If url's scheme is a local scheme, then return no referrer.
+	if (/^(about|blob|data):$/.test(url.protocol)) {
+		return 'no-referrer';
+	}
+
+	// 3. Set url's username to the empty string.
+	url.username = '';
+
+	// 4. Set url's password to null.
+	// Note: `null` appears to be a mistake as this actually results in the password being `"null"`.
+	url.password = '';
+
+	// 5. Set url's fragment to null.
+	// Note: `null` appears to be a mistake as this actually results in the fragment being `"#null"`.
+	url.hash = '';
+
+	// 6. If the origin-only flag is true, then:
+	if (originOnly) {
+		// 6.1. Set url's path to null.
+		// Note: `null` appears to be a mistake as this actually results in the path being `"/null"`.
+		url.pathname = '';
+
+		// 6.2. Set url's query to null.
+		// Note: `null` appears to be a mistake as this actually results in the query being `"?null"`.
+		url.search = '';
+	}
+
+	// 7. Return url.
+	return url;
+}
+
+/**
+ * @see {@link https://w3c.github.io/webappsec-referrer-policy/#enumdef-referrerpolicy|enum ReferrerPolicy}
+ */
+export const ReferrerPolicy = new Set([
+	'',
+	'no-referrer',
+	'no-referrer-when-downgrade',
+	'same-origin',
+	'origin',
+	'strict-origin',
+	'origin-when-cross-origin',
+	'strict-origin-when-cross-origin',
+	'unsafe-url'
+]);
+
+/**
+ * @see {@link https://w3c.github.io/webappsec-referrer-policy/#default-referrer-policy|default referrer policy}
+ */
+export const DEFAULT_REFERRER_POLICY = 'strict-origin-when-cross-origin';
+
+/**
+ * @see {@link https://w3c.github.io/webappsec-referrer-policy/#referrer-policies|Referrer Policy §3. Referrer Policies}
+ * @param {string} referrerPolicy
+ * @returns {string} referrerPolicy
+ */
+export function validateReferrerPolicy(referrerPolicy) {
+	if (!ReferrerPolicy.has(referrerPolicy)) {
+		throw new TypeError(`Invalid referrerPolicy: ${referrerPolicy}`);
+	}
+
+	return referrerPolicy;
+}
+
+/**
+ * @see {@link https://w3c.github.io/webappsec-secure-contexts/#is-origin-trustworthy|Referrer Policy §3.2. Is origin potentially trustworthy?}
+ * @param {external:URL} url
+ * @returns `true`: "Potentially Trustworthy", `false`: "Not Trustworthy"
+ */
+export function isOriginPotentiallyTrustworthy(url) {
+	// 1. If origin is an opaque origin, return "Not Trustworthy".
+	// Not applicable
+
+	// 2. Assert: origin is a tuple origin.
+	// Not for implementations
+
+	// 3. If origin's scheme is either "https" or "wss", return "Potentially Trustworthy".
+	if (/^(http|ws)s:$/.test(url.protocol)) {
+		return true;
+	}
+
+	// 4. If origin's host component matches one of the CIDR notations 127.0.0.0/8 or ::1/128 [RFC4632], return "Potentially Trustworthy".
+	const hostIp = url.host.replace(/(^\[)|(]$)/g, '');
+	const hostIPVersion = isIP(hostIp);
+
+	if (hostIPVersion === 4 && /^127\./.test(hostIp)) {
+		return true;
+	}
+
+	if (hostIPVersion === 6 && /^(((0+:){7})|(::(0+:){0,6}))0*1$/.test(hostIp)) {
+		return true;
+	}
+
+	// 5. If origin's host component is "localhost" or falls within ".localhost", and the user agent conforms to the name resolution rules in [let-localhost-be-localhost], return "Potentially Trustworthy".
+	// We are returning FALSE here because we cannot ensure conformance to
+	// let-localhost-be-loalhost (https://tools.ietf.org/html/draft-west-let-localhost-be-localhost)
+	if (url.host === 'localhost' || url.host.endsWith('.localhost')) {
+		return false;
+	}
+
+	// 6. If origin's scheme component is file, return "Potentially Trustworthy".
+	if (url.protocol === 'file:') {
+		return true;
+	}
+
+	// 7. If origin's scheme component is one which the user agent considers to be authenticated, return "Potentially Trustworthy".
+	// Not supported
+
+	// 8. If origin has been configured as a trustworthy origin, return "Potentially Trustworthy".
+	// Not supported
+
+	// 9. Return "Not Trustworthy".
+	return false;
+}
+
+/**
+ * @see {@link https://w3c.github.io/webappsec-secure-contexts/#is-url-trustworthy|Referrer Policy §3.3. Is url potentially trustworthy?}
+ * @param {external:URL} url
+ * @returns `true`: "Potentially Trustworthy", `false`: "Not Trustworthy"
+ */
+export function isUrlPotentiallyTrustworthy(url) {
+	// 1. If url is "about:blank" or "about:srcdoc", return "Potentially Trustworthy".
+	if (/^about:(blank|srcdoc)$/.test(url)) {
+		return true;
+	}
+
+	// 2. If url's scheme is "data", return "Potentially Trustworthy".
+	if (url.protocol === 'data:') {
+		return true;
+	}
+
+	// Note: The origin of blob: and filesystem: URLs is the origin of the context in which they were
+	// created. Therefore, blobs created in a trustworthy origin will themselves be potentially
+	// trustworthy.
+	if (/^(blob|filesystem):$/.test(url.protocol)) {
+		return true;
+	}
+
+	// 3. Return the result of executing §3.2 Is origin potentially trustworthy? on url's origin.
+	return isOriginPotentiallyTrustworthy(url);
+}
+
+/**
+ * Modifies the referrerURL to enforce any extra security policy considerations.
+ * @see {@link https://w3c.github.io/webappsec-referrer-policy/#determine-requests-referrer|Referrer Policy §8.3. Determine request's Referrer}, step 7
+ * @callback module:utils/referrer~referrerURLCallback
+ * @param {external:URL} referrerURL
+ * @returns {external:URL} modified referrerURL
+ */
+
+/**
+ * Modifies the referrerOrigin to enforce any extra security policy considerations.
+ * @see {@link https://w3c.github.io/webappsec-referrer-policy/#determine-requests-referrer|Referrer Policy §8.3. Determine request's Referrer}, step 7
+ * @callback module:utils/referrer~referrerOriginCallback
+ * @param {external:URL} referrerOrigin
+ * @returns {external:URL} modified referrerOrigin
+ */
+
+/**
+ * @see {@link https://w3c.github.io/webappsec-referrer-policy/#determine-requests-referrer|Referrer Policy §8.3. Determine request's Referrer}
+ * @param {Request} request
+ * @param {object} o
+ * @param {module:utils/referrer~referrerURLCallback} o.referrerURLCallback
+ * @param {module:utils/referrer~referrerOriginCallback} o.referrerOriginCallback
+ * @returns {external:URL} Request's referrer
+ */
+export function determineRequestsReferrer(request, {referrerURLCallback, referrerOriginCallback} = {}) {
+	// There are 2 notes in the specification about invalid pre-conditions.  We return null, here, for
+	// these cases:
+	// > Note: If request's referrer is "no-referrer", Fetch will not call into this algorithm.
+	// > Note: If request's referrer policy is the empty string, Fetch will not call into this
+	// > algorithm.
+	if (request.referrer === 'no-referrer' || request.referrerPolicy === '') {
+		return null;
+	}
+
+	// 1. Let policy be request's associated referrer policy.
+	const policy = request.referrerPolicy;
+
+	// 2. Let environment be request's client.
+	// not applicable to node.js
+
+	// 3. Switch on request's referrer:
+	if (request.referrer === 'about:client') {
+		return 'no-referrer';
+	}
+
+	// "a URL": Let referrerSource be request's referrer.
+	const referrerSource = request.referrer;
+
+	// 4. Let request's referrerURL be the result of stripping referrerSource for use as a referrer.
+	let referrerURL = stripURLForUseAsAReferrer(referrerSource);
+
+	// 5. Let referrerOrigin be the result of stripping referrerSource for use as a referrer, with the
+	//    origin-only flag set to true.
+	let referrerOrigin = stripURLForUseAsAReferrer(referrerSource, true);
+
+	// 6. If the result of serializing referrerURL is a string whose length is greater than 4096, set
+	//    referrerURL to referrerOrigin.
+	if (referrerURL.toString().length > 4096) {
+		referrerURL = referrerOrigin;
+	}
+
+	// 7. The user agent MAY alter referrerURL or referrerOrigin at this point to enforce arbitrary
+	//    policy considerations in the interests of minimizing data leakage. For example, the user
+	//    agent could strip the URL down to an origin, modify its host, replace it with an empty
+	//    string, etc.
+	if (referrerURLCallback) {
+		referrerURL = referrerURLCallback(referrerURL);
+	}
+
+	if (referrerOriginCallback) {
+		referrerOrigin = referrerOriginCallback(referrerOrigin);
+	}
+
+	// 8.Execute the statements corresponding to the value of policy:
+	const currentURL = new URL(request.url);
+
+	switch (policy) {
+		case 'no-referrer':
+			return 'no-referrer';
+
+		case 'origin':
+			return referrerOrigin;
+
+		case 'unsafe-url':
+			return referrerURL;
+
+		case 'strict-origin':
+			// 1. If referrerURL is a potentially trustworthy URL and request's current URL is not a
+			//    potentially trustworthy URL, then return no referrer.
+			if (isUrlPotentiallyTrustworthy(referrerURL) && !isUrlPotentiallyTrustworthy(currentURL)) {
+				return 'no-referrer';
+			}
+
+			// 2. Return referrerOrigin.
+			return referrerOrigin.toString();
+
+		case 'strict-origin-when-cross-origin':
+			// 1. If the origin of referrerURL and the origin of request's current URL are the same, then
+			//    return referrerURL.
+			if (referrerURL.origin === currentURL.origin) {
+				return referrerURL;
+			}
+
+			// 2. If referrerURL is a potentially trustworthy URL and request's current URL is not a
+			//    potentially trustworthy URL, then return no referrer.
+			if (isUrlPotentiallyTrustworthy(referrerURL) && !isUrlPotentiallyTrustworthy(currentURL)) {
+				return 'no-referrer';
+			}
+
+			// 3. Return referrerOrigin.
+			return referrerOrigin;
+
+		case 'same-origin':
+			// 1. If the origin of referrerURL and the origin of request's current URL are the same, then
+			//    return referrerURL.
+			if (referrerURL.origin === currentURL.origin) {
+				return referrerURL;
+			}
+
+			// 2. Return no referrer.
+			return 'no-referrer';
+
+		case 'origin-when-cross-origin':
+			// 1. If the origin of referrerURL and the origin of request's current URL are the same, then
+			//    return referrerURL.
+			if (referrerURL.origin === currentURL.origin) {
+				return referrerURL;
+			}
+
+			// Return referrerOrigin.
+			return referrerOrigin;
+
+		case 'no-referrer-when-downgrade':
+			// 1. If referrerURL is a potentially trustworthy URL and request's current URL is not a
+			//    potentially trustworthy URL, then return no referrer.
+			if (isUrlPotentiallyTrustworthy(referrerURL) && !isUrlPotentiallyTrustworthy(currentURL)) {
+				return 'no-referrer';
+			}
+
+			// 2. Return referrerURL.
+			return referrerURL;
+
+		default:
+			throw new TypeError(`Invalid referrerPolicy: ${policy}`);
+	}
+}
+
+/**
+ * @see {@link https://w3c.github.io/webappsec-referrer-policy/#parse-referrer-policy-from-header|Referrer Policy §8.1. Parse a referrer policy from a Referrer-Policy header}
+ * @param {Headers} headers Response headers
+ * @returns {string} policy
+ */
+export function parseReferrerPolicyFromHeader(headers) {
+	// 1. Let policy-tokens be the result of extracting header list values given `Referrer-Policy`
+	//    and response’s header list.
+	const policyTokens = (headers.get('referrer-policy') || '').split(/[,\s]+/);
+
+	// 2. Let policy be the empty string.
+	let policy = '';
+
+	// 3. For each token in policy-tokens, if token is a referrer policy and token is not the empty
+	//    string, then set policy to token.
+	// Note: This algorithm loops over multiple policy values to allow deployment of new policy
+	// values with fallbacks for older user agents, as described in § 11.1 Unknown Policy Values.
+	for (const token of policyTokens) {
+		if (token && ReferrerPolicy.has(token)) {
+			policy = token;
+		}
+	}
+
+	// 4. Return policy.
+	return policy;
+}
diff --git a/node_modules/web-streams-polyfill/LICENSE b/node_modules/web-streams-polyfill/LICENSE
new file mode 100644
index 0000000..4ca5166
--- /dev/null
+++ b/node_modules/web-streams-polyfill/LICENSE
@@ -0,0 +1,22 @@
+The MIT License (MIT)
+
+Copyright (c) 2020 Mattias Buelens
+Copyright (c) 2016 Diwank Singh Tomer
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/node_modules/web-streams-polyfill/README.md b/node_modules/web-streams-polyfill/README.md
new file mode 100644
index 0000000..7056882
--- /dev/null
+++ b/node_modules/web-streams-polyfill/README.md
@@ -0,0 +1,114 @@
+# web-streams-polyfill
+
+Web Streams, based on the WHATWG spec reference implementation.  
+
+[![build status](https://api.travis-ci.com/MattiasBuelens/web-streams-polyfill.svg?branch=master)](https://travis-ci.com/MattiasBuelens/web-streams-polyfill)
+[![npm version](https://img.shields.io/npm/v/web-streams-polyfill.svg)](https://www.npmjs.com/package/web-streams-polyfill)
+[![license](https://img.shields.io/npm/l/web-streams-polyfill.svg)](https://github.com/MattiasBuelens/web-streams-polyfill/blob/master/LICENSE)
+[![Join the chat at https://gitter.im/web-streams-polyfill/Lobby](https://badges.gitter.im/web-streams-polyfill/Lobby.svg)](https://gitter.im/web-streams-polyfill/Lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+
+## Links
+
+ - [Official spec][spec]
+ - [Reference implementation][ref-impl]
+
+## Usage
+
+This library comes in multiple variants:
+* `web-streams-polyfill`: a polyfill that replaces the native stream implementations.
+  Recommended for use in web apps supporting older browsers through a `<script>` tag.
+* `web-streams-polyfill/es6`: a polyfill targeting ES2015+ environments.
+  Recommended for use in web apps supporting modern browsers through a `<script>` tag.
+* `web-streams-polyfill/es2018`: a polyfill targeting ES2018+ environments.
+* `web-streams-polyfill/ponyfill`: a [ponyfill] that provides
+  the stream implementations without replacing any globals.
+  Recommended for use in legacy Node applications, or in web libraries supporting older browsers.
+* `web-streams-polyfill/ponyfill/es6`: a ponyfill targeting ES2015+ environments.
+  Recommended for use in Node 6+ applications, or in web libraries supporting modern browsers.
+* `web-streams-polyfill/ponyfill/es2018`: a ponyfill targeting ES2018+ environments.
+  Recommended for use in Node 10+ applications.
+
+Each variant also includes TypeScript type definitions, compatible with the DOM type definitions for streams included in TypeScript.
+
+Usage as a polyfill:
+```html
+<!-- option 1: hosted by unpkg CDN -->
+<script src="https://unpkg.com/web-streams-polyfill/dist/polyfill.min.js"></script>
+<!-- option 2: self hosted -->
+<script src="/path/to/web-streams-polyfill/dist/polyfill.min.js"></script>
+<script>
+var readable = new ReadableStream();
+</script>
+```
+Usage as a Node module:
+```js
+var streams = require("web-streams-polyfill/ponyfill");
+var readable = new streams.ReadableStream();
+```
+Usage as a ES2015 module:
+```js
+import { ReadableStream } from "web-streams-polyfill/ponyfill";
+const readable = new ReadableStream();
+```
+
+### Compatibility
+
+The `polyfill` and `ponyfill` variants work in any ES5-compatible environment that has a global `Promise`.
+If you need to support older browsers or Node versions that do not have a native `Promise` implementation
+(check the [support table][promise-support]), you must first include a `Promise` polyfill
+(e.g. [promise-polyfill][promise-polyfill]).
+
+The `polyfill/es6` and `ponyfill/es6` variants work in any ES2015-compatible environment.
+
+The `polyfill/es2018` and `ponyfill/es2018` variants work in any ES2018-compatible environment.
+
+[Async iterable support for `ReadableStream`][rs-asynciterator] is available in all variants, but requires an ES2018-compatible environment or a polyfill for `Symbol.asyncIterator`.
+
+[`WritableStreamDefaultController.signal`][ws-controller-signal] is available in all variants, but requires a global `AbortController` constructor. If necessary, consider using a polyfill such as [abortcontroller-polyfill].
+
+### Compliance
+
+The polyfill implements [version `4b6b93c` (25 Oct 2021)][spec-snapshot] of the streams specification.
+
+The polyfill is tested against the same [web platform tests][wpt] that are used by browsers to test their native implementations.
+The polyfill aims to pass all tests, although it allows some exceptions for practical reasons:
+* The `es2018` variant passes all of the tests, except for the ["bad buffers and views" tests for readable byte streams][wpt-bad-buffers].
+  These tests require the implementation to synchronously transfer the contents of an `ArrayBuffer`, which is not yet possible from JavaScript (although there is a [proposal][proposal-arraybuffer-transfer] to make it possible).
+  The reference implementation "cheats" on these tests [by making a copy instead][ref-impl-transferarraybuffer], but that is unacceptable for the polyfill's performance ([#3][issue-3]).
+* The `es6` variant passes the same tests as the `es2018` variant, except for the [test for the prototype of `ReadableStream`'s async iterator][wpt-async-iterator-prototype].
+  Retrieving the correct `%AsyncIteratorPrototype%` requires using an async generator (`async function* () {}`), which is invalid syntax before ES2018.
+  Instead, the polyfill [creates its own version][stub-async-iterator-prototype] which is functionally equivalent to the real prototype.
+* The `es5` variant passes the same tests as the `es6` variant, except for various tests about specific characteristics of the constructors, properties and methods.
+  These test failures do not affect the run-time behavior of the polyfill.
+  For example:
+  * The `name` property of down-leveled constructors is incorrect.
+  * The `length` property of down-leveled constructors and methods with optional arguments is incorrect.
+  * Not all properties and methods are correctly marked as non-enumerable.
+  * Down-leveled class methods are not correctly marked as non-constructable.
+
+The type definitions are compatible with the built-in stream types of TypeScript 3.3.
+
+### Contributors
+
+Thanks to these people for their work on [the original polyfill][creatorrr-polyfill]:
+
+ - Diwank Singh Tomer ([creatorrr](https://github.com/creatorrr))
+ - Anders Riutta ([ariutta](https://github.com/ariutta))
+
+[spec]: https://streams.spec.whatwg.org
+[ref-impl]: https://github.com/whatwg/streams
+[ponyfill]: https://github.com/sindresorhus/ponyfill
+[promise-support]: https://kangax.github.io/compat-table/es6/#test-Promise
+[promise-polyfill]: https://www.npmjs.com/package/promise-polyfill
+[rs-asynciterator]: https://streams.spec.whatwg.org/#rs-asynciterator
+[ws-controller-signal]: https://streams.spec.whatwg.org/#ws-default-controller-signal
+[abortcontroller-polyfill]: https://www.npmjs.com/package/abortcontroller-polyfill
+[spec-snapshot]: https://streams.spec.whatwg.org/commit-snapshots/4b6b93c69e531e2fe45a6ed4cb1484a7ba4eb8bb/
+[wpt]: https://github.com/web-platform-tests/wpt/tree/96ca25f0f7526282c0d47e6bf6a7edd439da1968/streams
+[wpt-bad-buffers]: https://github.com/web-platform-tests/wpt/blob/96ca25f0f7526282c0d47e6bf6a7edd439da1968/streams/readable-byte-streams/bad-buffers-and-views.any.js
+[proposal-arraybuffer-transfer]: https://github.com/domenic/proposal-arraybuffer-transfer
+[ref-impl-transferarraybuffer]: https://github.com/whatwg/streams/blob/4b6b93c69e531e2fe45a6ed4cb1484a7ba4eb8bb/reference-implementation/lib/abstract-ops/ecmascript.js#L16
+[issue-3]: https://github.com/MattiasBuelens/web-streams-polyfill/issues/3
+[wpt-async-iterator-prototype]: https://github.com/web-platform-tests/wpt/blob/96ca25f0f7526282c0d47e6bf6a7edd439da1968/streams/readable-streams/async-iterator.any.js#L24
+[stub-async-iterator-prototype]: https://github.com/MattiasBuelens/web-streams-polyfill/blob/v2.0.0/src/target/es5/stub/async-iterator-prototype.ts
+[creatorrr-polyfill]: https://github.com/creatorrr/web-streams-polyfill
diff --git a/node_modules/web-streams-polyfill/dist/polyfill.es2018.js b/node_modules/web-streams-polyfill/dist/polyfill.es2018.js
new file mode 100644
index 0000000..4e26968
--- /dev/null
+++ b/node_modules/web-streams-polyfill/dist/polyfill.es2018.js
@@ -0,0 +1,4241 @@
+/**
+ * web-streams-polyfill v3.2.1
+ */
+(function (global, factory) {
+    typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
+    typeof define === 'function' && define.amd ? define(['exports'], factory) :
+    (global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.WebStreamsPolyfill = {}));
+}(this, (function (exports) { 'use strict';
+
+    /// <reference lib="es2015.symbol" />
+    const SymbolPolyfill = typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol' ?
+        Symbol :
+        description => `Symbol(${description})`;
+
+    /// <reference lib="dom" />
+    function noop() {
+        return undefined;
+    }
+    function getGlobals() {
+        if (typeof self !== 'undefined') {
+            return self;
+        }
+        else if (typeof window !== 'undefined') {
+            return window;
+        }
+        else if (typeof global !== 'undefined') {
+            return global;
+        }
+        return undefined;
+    }
+    const globals = getGlobals();
+
+    function typeIsObject(x) {
+        return (typeof x === 'object' && x !== null) || typeof x === 'function';
+    }
+    const rethrowAssertionErrorRejection = noop;
+
+    const originalPromise = Promise;
+    const originalPromiseThen = Promise.prototype.then;
+    const originalPromiseResolve = Promise.resolve.bind(originalPromise);
+    const originalPromiseReject = Promise.reject.bind(originalPromise);
+    function newPromise(executor) {
+        return new originalPromise(executor);
+    }
+    function promiseResolvedWith(value) {
+        return originalPromiseResolve(value);
+    }
+    function promiseRejectedWith(reason) {
+        return originalPromiseReject(reason);
+    }
+    function PerformPromiseThen(promise, onFulfilled, onRejected) {
+        // There doesn't appear to be any way to correctly emulate the behaviour from JavaScript, so this is just an
+        // approximation.
+        return originalPromiseThen.call(promise, onFulfilled, onRejected);
+    }
+    function uponPromise(promise, onFulfilled, onRejected) {
+        PerformPromiseThen(PerformPromiseThen(promise, onFulfilled, onRejected), undefined, rethrowAssertionErrorRejection);
+    }
+    function uponFulfillment(promise, onFulfilled) {
+        uponPromise(promise, onFulfilled);
+    }
+    function uponRejection(promise, onRejected) {
+        uponPromise(promise, undefined, onRejected);
+    }
+    function transformPromiseWith(promise, fulfillmentHandler, rejectionHandler) {
+        return PerformPromiseThen(promise, fulfillmentHandler, rejectionHandler);
+    }
+    function setPromiseIsHandledToTrue(promise) {
+        PerformPromiseThen(promise, undefined, rethrowAssertionErrorRejection);
+    }
+    const queueMicrotask = (() => {
+        const globalQueueMicrotask = globals && globals.queueMicrotask;
+        if (typeof globalQueueMicrotask === 'function') {
+            return globalQueueMicrotask;
+        }
+        const resolvedPromise = promiseResolvedWith(undefined);
+        return (fn) => PerformPromiseThen(resolvedPromise, fn);
+    })();
+    function reflectCall(F, V, args) {
+        if (typeof F !== 'function') {
+            throw new TypeError('Argument is not a function');
+        }
+        return Function.prototype.apply.call(F, V, args);
+    }
+    function promiseCall(F, V, args) {
+        try {
+            return promiseResolvedWith(reflectCall(F, V, args));
+        }
+        catch (value) {
+            return promiseRejectedWith(value);
+        }
+    }
+
+    // Original from Chromium
+    // https://chromium.googlesource.com/chromium/src/+/0aee4434a4dba42a42abaea9bfbc0cd196a63bc1/third_party/blink/renderer/core/streams/SimpleQueue.js
+    const QUEUE_MAX_ARRAY_SIZE = 16384;
+    /**
+     * Simple queue structure.
+     *
+     * Avoids scalability issues with using a packed array directly by using
+     * multiple arrays in a linked list and keeping the array size bounded.
+     */
+    class SimpleQueue {
+        constructor() {
+            this._cursor = 0;
+            this._size = 0;
+            // _front and _back are always defined.
+            this._front = {
+                _elements: [],
+                _next: undefined
+            };
+            this._back = this._front;
+            // The cursor is used to avoid calling Array.shift().
+            // It contains the index of the front element of the array inside the
+            // front-most node. It is always in the range [0, QUEUE_MAX_ARRAY_SIZE).
+            this._cursor = 0;
+            // When there is only one node, size === elements.length - cursor.
+            this._size = 0;
+        }
+        get length() {
+            return this._size;
+        }
+        // For exception safety, this method is structured in order:
+        // 1. Read state
+        // 2. Calculate required state mutations
+        // 3. Perform state mutations
+        push(element) {
+            const oldBack = this._back;
+            let newBack = oldBack;
+            if (oldBack._elements.length === QUEUE_MAX_ARRAY_SIZE - 1) {
+                newBack = {
+                    _elements: [],
+                    _next: undefined
+                };
+            }
+            // push() is the mutation most likely to throw an exception, so it
+            // goes first.
+            oldBack._elements.push(element);
+            if (newBack !== oldBack) {
+                this._back = newBack;
+                oldBack._next = newBack;
+            }
+            ++this._size;
+        }
+        // Like push(), shift() follows the read -> calculate -> mutate pattern for
+        // exception safety.
+        shift() { // must not be called on an empty queue
+            const oldFront = this._front;
+            let newFront = oldFront;
+            const oldCursor = this._cursor;
+            let newCursor = oldCursor + 1;
+            const elements = oldFront._elements;
+            const element = elements[oldCursor];
+            if (newCursor === QUEUE_MAX_ARRAY_SIZE) {
+                newFront = oldFront._next;
+                newCursor = 0;
+            }
+            // No mutations before this point.
+            --this._size;
+            this._cursor = newCursor;
+            if (oldFront !== newFront) {
+                this._front = newFront;
+            }
+            // Permit shifted element to be garbage collected.
+            elements[oldCursor] = undefined;
+            return element;
+        }
+        // The tricky thing about forEach() is that it can be called
+        // re-entrantly. The queue may be mutated inside the callback. It is easy to
+        // see that push() within the callback has no negative effects since the end
+        // of the queue is checked for on every iteration. If shift() is called
+        // repeatedly within the callback then the next iteration may return an
+        // element that has been removed. In this case the callback will be called
+        // with undefined values until we either "catch up" with elements that still
+        // exist or reach the back of the queue.
+        forEach(callback) {
+            let i = this._cursor;
+            let node = this._front;
+            let elements = node._elements;
+            while (i !== elements.length || node._next !== undefined) {
+                if (i === elements.length) {
+                    node = node._next;
+                    elements = node._elements;
+                    i = 0;
+                    if (elements.length === 0) {
+                        break;
+                    }
+                }
+                callback(elements[i]);
+                ++i;
+            }
+        }
+        // Return the element that would be returned if shift() was called now,
+        // without modifying the queue.
+        peek() { // must not be called on an empty queue
+            const front = this._front;
+            const cursor = this._cursor;
+            return front._elements[cursor];
+        }
+    }
+
+    function ReadableStreamReaderGenericInitialize(reader, stream) {
+        reader._ownerReadableStream = stream;
+        stream._reader = reader;
+        if (stream._state === 'readable') {
+            defaultReaderClosedPromiseInitialize(reader);
+        }
+        else if (stream._state === 'closed') {
+            defaultReaderClosedPromiseInitializeAsResolved(reader);
+        }
+        else {
+            defaultReaderClosedPromiseInitializeAsRejected(reader, stream._storedError);
+        }
+    }
+    // A client of ReadableStreamDefaultReader and ReadableStreamBYOBReader may use these functions directly to bypass state
+    // check.
+    function ReadableStreamReaderGenericCancel(reader, reason) {
+        const stream = reader._ownerReadableStream;
+        return ReadableStreamCancel(stream, reason);
+    }
+    function ReadableStreamReaderGenericRelease(reader) {
+        if (reader._ownerReadableStream._state === 'readable') {
+            defaultReaderClosedPromiseReject(reader, new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));
+        }
+        else {
+            defaultReaderClosedPromiseResetToRejected(reader, new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));
+        }
+        reader._ownerReadableStream._reader = undefined;
+        reader._ownerReadableStream = undefined;
+    }
+    // Helper functions for the readers.
+    function readerLockException(name) {
+        return new TypeError('Cannot ' + name + ' a stream using a released reader');
+    }
+    // Helper functions for the ReadableStreamDefaultReader.
+    function defaultReaderClosedPromiseInitialize(reader) {
+        reader._closedPromise = newPromise((resolve, reject) => {
+            reader._closedPromise_resolve = resolve;
+            reader._closedPromise_reject = reject;
+        });
+    }
+    function defaultReaderClosedPromiseInitializeAsRejected(reader, reason) {
+        defaultReaderClosedPromiseInitialize(reader);
+        defaultReaderClosedPromiseReject(reader, reason);
+    }
+    function defaultReaderClosedPromiseInitializeAsResolved(reader) {
+        defaultReaderClosedPromiseInitialize(reader);
+        defaultReaderClosedPromiseResolve(reader);
+    }
+    function defaultReaderClosedPromiseReject(reader, reason) {
+        if (reader._closedPromise_reject === undefined) {
+            return;
+        }
+        setPromiseIsHandledToTrue(reader._closedPromise);
+        reader._closedPromise_reject(reason);
+        reader._closedPromise_resolve = undefined;
+        reader._closedPromise_reject = undefined;
+    }
+    function defaultReaderClosedPromiseResetToRejected(reader, reason) {
+        defaultReaderClosedPromiseInitializeAsRejected(reader, reason);
+    }
+    function defaultReaderClosedPromiseResolve(reader) {
+        if (reader._closedPromise_resolve === undefined) {
+            return;
+        }
+        reader._closedPromise_resolve(undefined);
+        reader._closedPromise_resolve = undefined;
+        reader._closedPromise_reject = undefined;
+    }
+
+    const AbortSteps = SymbolPolyfill('[[AbortSteps]]');
+    const ErrorSteps = SymbolPolyfill('[[ErrorSteps]]');
+    const CancelSteps = SymbolPolyfill('[[CancelSteps]]');
+    const PullSteps = SymbolPolyfill('[[PullSteps]]');
+
+    /// <reference lib="es2015.core" />
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite#Polyfill
+    const NumberIsFinite = Number.isFinite || function (x) {
+        return typeof x === 'number' && isFinite(x);
+    };
+
+    /// <reference lib="es2015.core" />
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc#Polyfill
+    const MathTrunc = Math.trunc || function (v) {
+        return v < 0 ? Math.ceil(v) : Math.floor(v);
+    };
+
+    // https://heycam.github.io/webidl/#idl-dictionaries
+    function isDictionary(x) {
+        return typeof x === 'object' || typeof x === 'function';
+    }
+    function assertDictionary(obj, context) {
+        if (obj !== undefined && !isDictionary(obj)) {
+            throw new TypeError(`${context} is not an object.`);
+        }
+    }
+    // https://heycam.github.io/webidl/#idl-callback-functions
+    function assertFunction(x, context) {
+        if (typeof x !== 'function') {
+            throw new TypeError(`${context} is not a function.`);
+        }
+    }
+    // https://heycam.github.io/webidl/#idl-object
+    function isObject(x) {
+        return (typeof x === 'object' && x !== null) || typeof x === 'function';
+    }
+    function assertObject(x, context) {
+        if (!isObject(x)) {
+            throw new TypeError(`${context} is not an object.`);
+        }
+    }
+    function assertRequiredArgument(x, position, context) {
+        if (x === undefined) {
+            throw new TypeError(`Parameter ${position} is required in '${context}'.`);
+        }
+    }
+    function assertRequiredField(x, field, context) {
+        if (x === undefined) {
+            throw new TypeError(`${field} is required in '${context}'.`);
+        }
+    }
+    // https://heycam.github.io/webidl/#idl-unrestricted-double
+    function convertUnrestrictedDouble(value) {
+        return Number(value);
+    }
+    function censorNegativeZero(x) {
+        return x === 0 ? 0 : x;
+    }
+    function integerPart(x) {
+        return censorNegativeZero(MathTrunc(x));
+    }
+    // https://heycam.github.io/webidl/#idl-unsigned-long-long
+    function convertUnsignedLongLongWithEnforceRange(value, context) {
+        const lowerBound = 0;
+        const upperBound = Number.MAX_SAFE_INTEGER;
+        let x = Number(value);
+        x = censorNegativeZero(x);
+        if (!NumberIsFinite(x)) {
+            throw new TypeError(`${context} is not a finite number`);
+        }
+        x = integerPart(x);
+        if (x < lowerBound || x > upperBound) {
+            throw new TypeError(`${context} is outside the accepted range of ${lowerBound} to ${upperBound}, inclusive`);
+        }
+        if (!NumberIsFinite(x) || x === 0) {
+            return 0;
+        }
+        // TODO Use BigInt if supported?
+        // let xBigInt = BigInt(integerPart(x));
+        // xBigInt = BigInt.asUintN(64, xBigInt);
+        // return Number(xBigInt);
+        return x;
+    }
+
+    function assertReadableStream(x, context) {
+        if (!IsReadableStream(x)) {
+            throw new TypeError(`${context} is not a ReadableStream.`);
+        }
+    }
+
+    // Abstract operations for the ReadableStream.
+    function AcquireReadableStreamDefaultReader(stream) {
+        return new ReadableStreamDefaultReader(stream);
+    }
+    // ReadableStream API exposed for controllers.
+    function ReadableStreamAddReadRequest(stream, readRequest) {
+        stream._reader._readRequests.push(readRequest);
+    }
+    function ReadableStreamFulfillReadRequest(stream, chunk, done) {
+        const reader = stream._reader;
+        const readRequest = reader._readRequests.shift();
+        if (done) {
+            readRequest._closeSteps();
+        }
+        else {
+            readRequest._chunkSteps(chunk);
+        }
+    }
+    function ReadableStreamGetNumReadRequests(stream) {
+        return stream._reader._readRequests.length;
+    }
+    function ReadableStreamHasDefaultReader(stream) {
+        const reader = stream._reader;
+        if (reader === undefined) {
+            return false;
+        }
+        if (!IsReadableStreamDefaultReader(reader)) {
+            return false;
+        }
+        return true;
+    }
+    /**
+     * A default reader vended by a {@link ReadableStream}.
+     *
+     * @public
+     */
+    class ReadableStreamDefaultReader {
+        constructor(stream) {
+            assertRequiredArgument(stream, 1, 'ReadableStreamDefaultReader');
+            assertReadableStream(stream, 'First parameter');
+            if (IsReadableStreamLocked(stream)) {
+                throw new TypeError('This stream has already been locked for exclusive reading by another reader');
+            }
+            ReadableStreamReaderGenericInitialize(this, stream);
+            this._readRequests = new SimpleQueue();
+        }
+        /**
+         * Returns a promise that will be fulfilled when the stream becomes closed,
+         * or rejected if the stream ever errors or the reader's lock is released before the stream finishes closing.
+         */
+        get closed() {
+            if (!IsReadableStreamDefaultReader(this)) {
+                return promiseRejectedWith(defaultReaderBrandCheckException('closed'));
+            }
+            return this._closedPromise;
+        }
+        /**
+         * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.
+         */
+        cancel(reason = undefined) {
+            if (!IsReadableStreamDefaultReader(this)) {
+                return promiseRejectedWith(defaultReaderBrandCheckException('cancel'));
+            }
+            if (this._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('cancel'));
+            }
+            return ReadableStreamReaderGenericCancel(this, reason);
+        }
+        /**
+         * Returns a promise that allows access to the next chunk from the stream's internal queue, if available.
+         *
+         * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.
+         */
+        read() {
+            if (!IsReadableStreamDefaultReader(this)) {
+                return promiseRejectedWith(defaultReaderBrandCheckException('read'));
+            }
+            if (this._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('read from'));
+            }
+            let resolvePromise;
+            let rejectPromise;
+            const promise = newPromise((resolve, reject) => {
+                resolvePromise = resolve;
+                rejectPromise = reject;
+            });
+            const readRequest = {
+                _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),
+                _closeSteps: () => resolvePromise({ value: undefined, done: true }),
+                _errorSteps: e => rejectPromise(e)
+            };
+            ReadableStreamDefaultReaderRead(this, readRequest);
+            return promise;
+        }
+        /**
+         * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.
+         * If the associated stream is errored when the lock is released, the reader will appear errored in the same way
+         * from now on; otherwise, the reader will appear closed.
+         *
+         * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by
+         * the reader's {@link ReadableStreamDefaultReader.read | read()} method has not yet been settled. Attempting to
+         * do so will throw a `TypeError` and leave the reader locked to the stream.
+         */
+        releaseLock() {
+            if (!IsReadableStreamDefaultReader(this)) {
+                throw defaultReaderBrandCheckException('releaseLock');
+            }
+            if (this._ownerReadableStream === undefined) {
+                return;
+            }
+            if (this._readRequests.length > 0) {
+                throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');
+            }
+            ReadableStreamReaderGenericRelease(this);
+        }
+    }
+    Object.defineProperties(ReadableStreamDefaultReader.prototype, {
+        cancel: { enumerable: true },
+        read: { enumerable: true },
+        releaseLock: { enumerable: true },
+        closed: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableStreamDefaultReader.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableStreamDefaultReader',
+            configurable: true
+        });
+    }
+    // Abstract operations for the readers.
+    function IsReadableStreamDefaultReader(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_readRequests')) {
+            return false;
+        }
+        return x instanceof ReadableStreamDefaultReader;
+    }
+    function ReadableStreamDefaultReaderRead(reader, readRequest) {
+        const stream = reader._ownerReadableStream;
+        stream._disturbed = true;
+        if (stream._state === 'closed') {
+            readRequest._closeSteps();
+        }
+        else if (stream._state === 'errored') {
+            readRequest._errorSteps(stream._storedError);
+        }
+        else {
+            stream._readableStreamController[PullSteps](readRequest);
+        }
+    }
+    // Helper functions for the ReadableStreamDefaultReader.
+    function defaultReaderBrandCheckException(name) {
+        return new TypeError(`ReadableStreamDefaultReader.prototype.${name} can only be used on a ReadableStreamDefaultReader`);
+    }
+
+    /// <reference lib="es2018.asynciterable" />
+    /* eslint-disable @typescript-eslint/no-empty-function */
+    const AsyncIteratorPrototype = Object.getPrototypeOf(Object.getPrototypeOf(async function* () { }).prototype);
+
+    /// <reference lib="es2018.asynciterable" />
+    class ReadableStreamAsyncIteratorImpl {
+        constructor(reader, preventCancel) {
+            this._ongoingPromise = undefined;
+            this._isFinished = false;
+            this._reader = reader;
+            this._preventCancel = preventCancel;
+        }
+        next() {
+            const nextSteps = () => this._nextSteps();
+            this._ongoingPromise = this._ongoingPromise ?
+                transformPromiseWith(this._ongoingPromise, nextSteps, nextSteps) :
+                nextSteps();
+            return this._ongoingPromise;
+        }
+        return(value) {
+            const returnSteps = () => this._returnSteps(value);
+            return this._ongoingPromise ?
+                transformPromiseWith(this._ongoingPromise, returnSteps, returnSteps) :
+                returnSteps();
+        }
+        _nextSteps() {
+            if (this._isFinished) {
+                return Promise.resolve({ value: undefined, done: true });
+            }
+            const reader = this._reader;
+            if (reader._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('iterate'));
+            }
+            let resolvePromise;
+            let rejectPromise;
+            const promise = newPromise((resolve, reject) => {
+                resolvePromise = resolve;
+                rejectPromise = reject;
+            });
+            const readRequest = {
+                _chunkSteps: chunk => {
+                    this._ongoingPromise = undefined;
+                    // This needs to be delayed by one microtask, otherwise we stop pulling too early which breaks a test.
+                    // FIXME Is this a bug in the specification, or in the test?
+                    queueMicrotask(() => resolvePromise({ value: chunk, done: false }));
+                },
+                _closeSteps: () => {
+                    this._ongoingPromise = undefined;
+                    this._isFinished = true;
+                    ReadableStreamReaderGenericRelease(reader);
+                    resolvePromise({ value: undefined, done: true });
+                },
+                _errorSteps: reason => {
+                    this._ongoingPromise = undefined;
+                    this._isFinished = true;
+                    ReadableStreamReaderGenericRelease(reader);
+                    rejectPromise(reason);
+                }
+            };
+            ReadableStreamDefaultReaderRead(reader, readRequest);
+            return promise;
+        }
+        _returnSteps(value) {
+            if (this._isFinished) {
+                return Promise.resolve({ value, done: true });
+            }
+            this._isFinished = true;
+            const reader = this._reader;
+            if (reader._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('finish iterating'));
+            }
+            if (!this._preventCancel) {
+                const result = ReadableStreamReaderGenericCancel(reader, value);
+                ReadableStreamReaderGenericRelease(reader);
+                return transformPromiseWith(result, () => ({ value, done: true }));
+            }
+            ReadableStreamReaderGenericRelease(reader);
+            return promiseResolvedWith({ value, done: true });
+        }
+    }
+    const ReadableStreamAsyncIteratorPrototype = {
+        next() {
+            if (!IsReadableStreamAsyncIterator(this)) {
+                return promiseRejectedWith(streamAsyncIteratorBrandCheckException('next'));
+            }
+            return this._asyncIteratorImpl.next();
+        },
+        return(value) {
+            if (!IsReadableStreamAsyncIterator(this)) {
+                return promiseRejectedWith(streamAsyncIteratorBrandCheckException('return'));
+            }
+            return this._asyncIteratorImpl.return(value);
+        }
+    };
+    if (AsyncIteratorPrototype !== undefined) {
+        Object.setPrototypeOf(ReadableStreamAsyncIteratorPrototype, AsyncIteratorPrototype);
+    }
+    // Abstract operations for the ReadableStream.
+    function AcquireReadableStreamAsyncIterator(stream, preventCancel) {
+        const reader = AcquireReadableStreamDefaultReader(stream);
+        const impl = new ReadableStreamAsyncIteratorImpl(reader, preventCancel);
+        const iterator = Object.create(ReadableStreamAsyncIteratorPrototype);
+        iterator._asyncIteratorImpl = impl;
+        return iterator;
+    }
+    function IsReadableStreamAsyncIterator(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_asyncIteratorImpl')) {
+            return false;
+        }
+        try {
+            // noinspection SuspiciousTypeOfGuard
+            return x._asyncIteratorImpl instanceof
+                ReadableStreamAsyncIteratorImpl;
+        }
+        catch (_a) {
+            return false;
+        }
+    }
+    // Helper functions for the ReadableStream.
+    function streamAsyncIteratorBrandCheckException(name) {
+        return new TypeError(`ReadableStreamAsyncIterator.${name} can only be used on a ReadableSteamAsyncIterator`);
+    }
+
+    /// <reference lib="es2015.core" />
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Polyfill
+    const NumberIsNaN = Number.isNaN || function (x) {
+        // eslint-disable-next-line no-self-compare
+        return x !== x;
+    };
+
+    function CreateArrayFromList(elements) {
+        // We use arrays to represent lists, so this is basically a no-op.
+        // Do a slice though just in case we happen to depend on the unique-ness.
+        return elements.slice();
+    }
+    function CopyDataBlockBytes(dest, destOffset, src, srcOffset, n) {
+        new Uint8Array(dest).set(new Uint8Array(src, srcOffset, n), destOffset);
+    }
+    // Not implemented correctly
+    function TransferArrayBuffer(O) {
+        return O;
+    }
+    // Not implemented correctly
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    function IsDetachedBuffer(O) {
+        return false;
+    }
+    function ArrayBufferSlice(buffer, begin, end) {
+        // ArrayBuffer.prototype.slice is not available on IE10
+        // https://www.caniuse.com/mdn-javascript_builtins_arraybuffer_slice
+        if (buffer.slice) {
+            return buffer.slice(begin, end);
+        }
+        const length = end - begin;
+        const slice = new ArrayBuffer(length);
+        CopyDataBlockBytes(slice, 0, buffer, begin, length);
+        return slice;
+    }
+
+    function IsNonNegativeNumber(v) {
+        if (typeof v !== 'number') {
+            return false;
+        }
+        if (NumberIsNaN(v)) {
+            return false;
+        }
+        if (v < 0) {
+            return false;
+        }
+        return true;
+    }
+    function CloneAsUint8Array(O) {
+        const buffer = ArrayBufferSlice(O.buffer, O.byteOffset, O.byteOffset + O.byteLength);
+        return new Uint8Array(buffer);
+    }
+
+    function DequeueValue(container) {
+        const pair = container._queue.shift();
+        container._queueTotalSize -= pair.size;
+        if (container._queueTotalSize < 0) {
+            container._queueTotalSize = 0;
+        }
+        return pair.value;
+    }
+    function EnqueueValueWithSize(container, value, size) {
+        if (!IsNonNegativeNumber(size) || size === Infinity) {
+            throw new RangeError('Size must be a finite, non-NaN, non-negative number.');
+        }
+        container._queue.push({ value, size });
+        container._queueTotalSize += size;
+    }
+    function PeekQueueValue(container) {
+        const pair = container._queue.peek();
+        return pair.value;
+    }
+    function ResetQueue(container) {
+        container._queue = new SimpleQueue();
+        container._queueTotalSize = 0;
+    }
+
+    /**
+     * A pull-into request in a {@link ReadableByteStreamController}.
+     *
+     * @public
+     */
+    class ReadableStreamBYOBRequest {
+        constructor() {
+            throw new TypeError('Illegal constructor');
+        }
+        /**
+         * Returns the view for writing in to, or `null` if the BYOB request has already been responded to.
+         */
+        get view() {
+            if (!IsReadableStreamBYOBRequest(this)) {
+                throw byobRequestBrandCheckException('view');
+            }
+            return this._view;
+        }
+        respond(bytesWritten) {
+            if (!IsReadableStreamBYOBRequest(this)) {
+                throw byobRequestBrandCheckException('respond');
+            }
+            assertRequiredArgument(bytesWritten, 1, 'respond');
+            bytesWritten = convertUnsignedLongLongWithEnforceRange(bytesWritten, 'First parameter');
+            if (this._associatedReadableByteStreamController === undefined) {
+                throw new TypeError('This BYOB request has been invalidated');
+            }
+            if (IsDetachedBuffer(this._view.buffer)) ;
+            ReadableByteStreamControllerRespond(this._associatedReadableByteStreamController, bytesWritten);
+        }
+        respondWithNewView(view) {
+            if (!IsReadableStreamBYOBRequest(this)) {
+                throw byobRequestBrandCheckException('respondWithNewView');
+            }
+            assertRequiredArgument(view, 1, 'respondWithNewView');
+            if (!ArrayBuffer.isView(view)) {
+                throw new TypeError('You can only respond with array buffer views');
+            }
+            if (this._associatedReadableByteStreamController === undefined) {
+                throw new TypeError('This BYOB request has been invalidated');
+            }
+            if (IsDetachedBuffer(view.buffer)) ;
+            ReadableByteStreamControllerRespondWithNewView(this._associatedReadableByteStreamController, view);
+        }
+    }
+    Object.defineProperties(ReadableStreamBYOBRequest.prototype, {
+        respond: { enumerable: true },
+        respondWithNewView: { enumerable: true },
+        view: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableStreamBYOBRequest.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableStreamBYOBRequest',
+            configurable: true
+        });
+    }
+    /**
+     * Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue.
+     *
+     * @public
+     */
+    class ReadableByteStreamController {
+        constructor() {
+            throw new TypeError('Illegal constructor');
+        }
+        /**
+         * Returns the current BYOB pull request, or `null` if there isn't one.
+         */
+        get byobRequest() {
+            if (!IsReadableByteStreamController(this)) {
+                throw byteStreamControllerBrandCheckException('byobRequest');
+            }
+            return ReadableByteStreamControllerGetBYOBRequest(this);
+        }
+        /**
+         * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is
+         * over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure.
+         */
+        get desiredSize() {
+            if (!IsReadableByteStreamController(this)) {
+                throw byteStreamControllerBrandCheckException('desiredSize');
+            }
+            return ReadableByteStreamControllerGetDesiredSize(this);
+        }
+        /**
+         * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from
+         * the stream, but once those are read, the stream will become closed.
+         */
+        close() {
+            if (!IsReadableByteStreamController(this)) {
+                throw byteStreamControllerBrandCheckException('close');
+            }
+            if (this._closeRequested) {
+                throw new TypeError('The stream has already been closed; do not close it again!');
+            }
+            const state = this._controlledReadableByteStream._state;
+            if (state !== 'readable') {
+                throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be closed`);
+            }
+            ReadableByteStreamControllerClose(this);
+        }
+        enqueue(chunk) {
+            if (!IsReadableByteStreamController(this)) {
+                throw byteStreamControllerBrandCheckException('enqueue');
+            }
+            assertRequiredArgument(chunk, 1, 'enqueue');
+            if (!ArrayBuffer.isView(chunk)) {
+                throw new TypeError('chunk must be an array buffer view');
+            }
+            if (chunk.byteLength === 0) {
+                throw new TypeError('chunk must have non-zero byteLength');
+            }
+            if (chunk.buffer.byteLength === 0) {
+                throw new TypeError(`chunk's buffer must have non-zero byteLength`);
+            }
+            if (this._closeRequested) {
+                throw new TypeError('stream is closed or draining');
+            }
+            const state = this._controlledReadableByteStream._state;
+            if (state !== 'readable') {
+                throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be enqueued to`);
+            }
+            ReadableByteStreamControllerEnqueue(this, chunk);
+        }
+        /**
+         * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.
+         */
+        error(e = undefined) {
+            if (!IsReadableByteStreamController(this)) {
+                throw byteStreamControllerBrandCheckException('error');
+            }
+            ReadableByteStreamControllerError(this, e);
+        }
+        /** @internal */
+        [CancelSteps](reason) {
+            ReadableByteStreamControllerClearPendingPullIntos(this);
+            ResetQueue(this);
+            const result = this._cancelAlgorithm(reason);
+            ReadableByteStreamControllerClearAlgorithms(this);
+            return result;
+        }
+        /** @internal */
+        [PullSteps](readRequest) {
+            const stream = this._controlledReadableByteStream;
+            if (this._queueTotalSize > 0) {
+                const entry = this._queue.shift();
+                this._queueTotalSize -= entry.byteLength;
+                ReadableByteStreamControllerHandleQueueDrain(this);
+                const view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);
+                readRequest._chunkSteps(view);
+                return;
+            }
+            const autoAllocateChunkSize = this._autoAllocateChunkSize;
+            if (autoAllocateChunkSize !== undefined) {
+                let buffer;
+                try {
+                    buffer = new ArrayBuffer(autoAllocateChunkSize);
+                }
+                catch (bufferE) {
+                    readRequest._errorSteps(bufferE);
+                    return;
+                }
+                const pullIntoDescriptor = {
+                    buffer,
+                    bufferByteLength: autoAllocateChunkSize,
+                    byteOffset: 0,
+                    byteLength: autoAllocateChunkSize,
+                    bytesFilled: 0,
+                    elementSize: 1,
+                    viewConstructor: Uint8Array,
+                    readerType: 'default'
+                };
+                this._pendingPullIntos.push(pullIntoDescriptor);
+            }
+            ReadableStreamAddReadRequest(stream, readRequest);
+            ReadableByteStreamControllerCallPullIfNeeded(this);
+        }
+    }
+    Object.defineProperties(ReadableByteStreamController.prototype, {
+        close: { enumerable: true },
+        enqueue: { enumerable: true },
+        error: { enumerable: true },
+        byobRequest: { enumerable: true },
+        desiredSize: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableByteStreamController.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableByteStreamController',
+            configurable: true
+        });
+    }
+    // Abstract operations for the ReadableByteStreamController.
+    function IsReadableByteStreamController(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableByteStream')) {
+            return false;
+        }
+        return x instanceof ReadableByteStreamController;
+    }
+    function IsReadableStreamBYOBRequest(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_associatedReadableByteStreamController')) {
+            return false;
+        }
+        return x instanceof ReadableStreamBYOBRequest;
+    }
+    function ReadableByteStreamControllerCallPullIfNeeded(controller) {
+        const shouldPull = ReadableByteStreamControllerShouldCallPull(controller);
+        if (!shouldPull) {
+            return;
+        }
+        if (controller._pulling) {
+            controller._pullAgain = true;
+            return;
+        }
+        controller._pulling = true;
+        // TODO: Test controller argument
+        const pullPromise = controller._pullAlgorithm();
+        uponPromise(pullPromise, () => {
+            controller._pulling = false;
+            if (controller._pullAgain) {
+                controller._pullAgain = false;
+                ReadableByteStreamControllerCallPullIfNeeded(controller);
+            }
+        }, e => {
+            ReadableByteStreamControllerError(controller, e);
+        });
+    }
+    function ReadableByteStreamControllerClearPendingPullIntos(controller) {
+        ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+        controller._pendingPullIntos = new SimpleQueue();
+    }
+    function ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor) {
+        let done = false;
+        if (stream._state === 'closed') {
+            done = true;
+        }
+        const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor);
+        if (pullIntoDescriptor.readerType === 'default') {
+            ReadableStreamFulfillReadRequest(stream, filledView, done);
+        }
+        else {
+            ReadableStreamFulfillReadIntoRequest(stream, filledView, done);
+        }
+    }
+    function ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor) {
+        const bytesFilled = pullIntoDescriptor.bytesFilled;
+        const elementSize = pullIntoDescriptor.elementSize;
+        return new pullIntoDescriptor.viewConstructor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize);
+    }
+    function ReadableByteStreamControllerEnqueueChunkToQueue(controller, buffer, byteOffset, byteLength) {
+        controller._queue.push({ buffer, byteOffset, byteLength });
+        controller._queueTotalSize += byteLength;
+    }
+    function ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor) {
+        const elementSize = pullIntoDescriptor.elementSize;
+        const currentAlignedBytes = pullIntoDescriptor.bytesFilled - pullIntoDescriptor.bytesFilled % elementSize;
+        const maxBytesToCopy = Math.min(controller._queueTotalSize, pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled);
+        const maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;
+        const maxAlignedBytes = maxBytesFilled - maxBytesFilled % elementSize;
+        let totalBytesToCopyRemaining = maxBytesToCopy;
+        let ready = false;
+        if (maxAlignedBytes > currentAlignedBytes) {
+            totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled;
+            ready = true;
+        }
+        const queue = controller._queue;
+        while (totalBytesToCopyRemaining > 0) {
+            const headOfQueue = queue.peek();
+            const bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength);
+            const destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;
+            CopyDataBlockBytes(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy);
+            if (headOfQueue.byteLength === bytesToCopy) {
+                queue.shift();
+            }
+            else {
+                headOfQueue.byteOffset += bytesToCopy;
+                headOfQueue.byteLength -= bytesToCopy;
+            }
+            controller._queueTotalSize -= bytesToCopy;
+            ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor);
+            totalBytesToCopyRemaining -= bytesToCopy;
+        }
+        return ready;
+    }
+    function ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, size, pullIntoDescriptor) {
+        pullIntoDescriptor.bytesFilled += size;
+    }
+    function ReadableByteStreamControllerHandleQueueDrain(controller) {
+        if (controller._queueTotalSize === 0 && controller._closeRequested) {
+            ReadableByteStreamControllerClearAlgorithms(controller);
+            ReadableStreamClose(controller._controlledReadableByteStream);
+        }
+        else {
+            ReadableByteStreamControllerCallPullIfNeeded(controller);
+        }
+    }
+    function ReadableByteStreamControllerInvalidateBYOBRequest(controller) {
+        if (controller._byobRequest === null) {
+            return;
+        }
+        controller._byobRequest._associatedReadableByteStreamController = undefined;
+        controller._byobRequest._view = null;
+        controller._byobRequest = null;
+    }
+    function ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller) {
+        while (controller._pendingPullIntos.length > 0) {
+            if (controller._queueTotalSize === 0) {
+                return;
+            }
+            const pullIntoDescriptor = controller._pendingPullIntos.peek();
+            if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {
+                ReadableByteStreamControllerShiftPendingPullInto(controller);
+                ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);
+            }
+        }
+    }
+    function ReadableByteStreamControllerPullInto(controller, view, readIntoRequest) {
+        const stream = controller._controlledReadableByteStream;
+        let elementSize = 1;
+        if (view.constructor !== DataView) {
+            elementSize = view.constructor.BYTES_PER_ELEMENT;
+        }
+        const ctor = view.constructor;
+        // try {
+        const buffer = TransferArrayBuffer(view.buffer);
+        // } catch (e) {
+        //   readIntoRequest._errorSteps(e);
+        //   return;
+        // }
+        const pullIntoDescriptor = {
+            buffer,
+            bufferByteLength: buffer.byteLength,
+            byteOffset: view.byteOffset,
+            byteLength: view.byteLength,
+            bytesFilled: 0,
+            elementSize,
+            viewConstructor: ctor,
+            readerType: 'byob'
+        };
+        if (controller._pendingPullIntos.length > 0) {
+            controller._pendingPullIntos.push(pullIntoDescriptor);
+            // No ReadableByteStreamControllerCallPullIfNeeded() call since:
+            // - No change happens on desiredSize
+            // - The source has already been notified of that there's at least 1 pending read(view)
+            ReadableStreamAddReadIntoRequest(stream, readIntoRequest);
+            return;
+        }
+        if (stream._state === 'closed') {
+            const emptyView = new ctor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0);
+            readIntoRequest._closeSteps(emptyView);
+            return;
+        }
+        if (controller._queueTotalSize > 0) {
+            if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {
+                const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor);
+                ReadableByteStreamControllerHandleQueueDrain(controller);
+                readIntoRequest._chunkSteps(filledView);
+                return;
+            }
+            if (controller._closeRequested) {
+                const e = new TypeError('Insufficient bytes to fill elements in the given buffer');
+                ReadableByteStreamControllerError(controller, e);
+                readIntoRequest._errorSteps(e);
+                return;
+            }
+        }
+        controller._pendingPullIntos.push(pullIntoDescriptor);
+        ReadableStreamAddReadIntoRequest(stream, readIntoRequest);
+        ReadableByteStreamControllerCallPullIfNeeded(controller);
+    }
+    function ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor) {
+        const stream = controller._controlledReadableByteStream;
+        if (ReadableStreamHasBYOBReader(stream)) {
+            while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {
+                const pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);
+                ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);
+            }
+        }
+    }
+    function ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, pullIntoDescriptor) {
+        ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor);
+        if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {
+            return;
+        }
+        ReadableByteStreamControllerShiftPendingPullInto(controller);
+        const remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize;
+        if (remainderSize > 0) {
+            const end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;
+            const remainder = ArrayBufferSlice(pullIntoDescriptor.buffer, end - remainderSize, end);
+            ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength);
+        }
+        pullIntoDescriptor.bytesFilled -= remainderSize;
+        ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);
+        ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);
+    }
+    function ReadableByteStreamControllerRespondInternal(controller, bytesWritten) {
+        const firstDescriptor = controller._pendingPullIntos.peek();
+        ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+        const state = controller._controlledReadableByteStream._state;
+        if (state === 'closed') {
+            ReadableByteStreamControllerRespondInClosedState(controller);
+        }
+        else {
+            ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);
+        }
+        ReadableByteStreamControllerCallPullIfNeeded(controller);
+    }
+    function ReadableByteStreamControllerShiftPendingPullInto(controller) {
+        const descriptor = controller._pendingPullIntos.shift();
+        return descriptor;
+    }
+    function ReadableByteStreamControllerShouldCallPull(controller) {
+        const stream = controller._controlledReadableByteStream;
+        if (stream._state !== 'readable') {
+            return false;
+        }
+        if (controller._closeRequested) {
+            return false;
+        }
+        if (!controller._started) {
+            return false;
+        }
+        if (ReadableStreamHasDefaultReader(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+            return true;
+        }
+        if (ReadableStreamHasBYOBReader(stream) && ReadableStreamGetNumReadIntoRequests(stream) > 0) {
+            return true;
+        }
+        const desiredSize = ReadableByteStreamControllerGetDesiredSize(controller);
+        if (desiredSize > 0) {
+            return true;
+        }
+        return false;
+    }
+    function ReadableByteStreamControllerClearAlgorithms(controller) {
+        controller._pullAlgorithm = undefined;
+        controller._cancelAlgorithm = undefined;
+    }
+    // A client of ReadableByteStreamController may use these functions directly to bypass state check.
+    function ReadableByteStreamControllerClose(controller) {
+        const stream = controller._controlledReadableByteStream;
+        if (controller._closeRequested || stream._state !== 'readable') {
+            return;
+        }
+        if (controller._queueTotalSize > 0) {
+            controller._closeRequested = true;
+            return;
+        }
+        if (controller._pendingPullIntos.length > 0) {
+            const firstPendingPullInto = controller._pendingPullIntos.peek();
+            if (firstPendingPullInto.bytesFilled > 0) {
+                const e = new TypeError('Insufficient bytes to fill elements in the given buffer');
+                ReadableByteStreamControllerError(controller, e);
+                throw e;
+            }
+        }
+        ReadableByteStreamControllerClearAlgorithms(controller);
+        ReadableStreamClose(stream);
+    }
+    function ReadableByteStreamControllerEnqueue(controller, chunk) {
+        const stream = controller._controlledReadableByteStream;
+        if (controller._closeRequested || stream._state !== 'readable') {
+            return;
+        }
+        const buffer = chunk.buffer;
+        const byteOffset = chunk.byteOffset;
+        const byteLength = chunk.byteLength;
+        const transferredBuffer = TransferArrayBuffer(buffer);
+        if (controller._pendingPullIntos.length > 0) {
+            const firstPendingPullInto = controller._pendingPullIntos.peek();
+            if (IsDetachedBuffer(firstPendingPullInto.buffer)) ;
+            firstPendingPullInto.buffer = TransferArrayBuffer(firstPendingPullInto.buffer);
+        }
+        ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+        if (ReadableStreamHasDefaultReader(stream)) {
+            if (ReadableStreamGetNumReadRequests(stream) === 0) {
+                ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+            }
+            else {
+                if (controller._pendingPullIntos.length > 0) {
+                    ReadableByteStreamControllerShiftPendingPullInto(controller);
+                }
+                const transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength);
+                ReadableStreamFulfillReadRequest(stream, transferredView, false);
+            }
+        }
+        else if (ReadableStreamHasBYOBReader(stream)) {
+            // TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully.
+            ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+            ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);
+        }
+        else {
+            ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+        }
+        ReadableByteStreamControllerCallPullIfNeeded(controller);
+    }
+    function ReadableByteStreamControllerError(controller, e) {
+        const stream = controller._controlledReadableByteStream;
+        if (stream._state !== 'readable') {
+            return;
+        }
+        ReadableByteStreamControllerClearPendingPullIntos(controller);
+        ResetQueue(controller);
+        ReadableByteStreamControllerClearAlgorithms(controller);
+        ReadableStreamError(stream, e);
+    }
+    function ReadableByteStreamControllerGetBYOBRequest(controller) {
+        if (controller._byobRequest === null && controller._pendingPullIntos.length > 0) {
+            const firstDescriptor = controller._pendingPullIntos.peek();
+            const view = new Uint8Array(firstDescriptor.buffer, firstDescriptor.byteOffset + firstDescriptor.bytesFilled, firstDescriptor.byteLength - firstDescriptor.bytesFilled);
+            const byobRequest = Object.create(ReadableStreamBYOBRequest.prototype);
+            SetUpReadableStreamBYOBRequest(byobRequest, controller, view);
+            controller._byobRequest = byobRequest;
+        }
+        return controller._byobRequest;
+    }
+    function ReadableByteStreamControllerGetDesiredSize(controller) {
+        const state = controller._controlledReadableByteStream._state;
+        if (state === 'errored') {
+            return null;
+        }
+        if (state === 'closed') {
+            return 0;
+        }
+        return controller._strategyHWM - controller._queueTotalSize;
+    }
+    function ReadableByteStreamControllerRespond(controller, bytesWritten) {
+        const firstDescriptor = controller._pendingPullIntos.peek();
+        const state = controller._controlledReadableByteStream._state;
+        if (state === 'closed') {
+            if (bytesWritten !== 0) {
+                throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream');
+            }
+        }
+        else {
+            if (bytesWritten === 0) {
+                throw new TypeError('bytesWritten must be greater than 0 when calling respond() on a readable stream');
+            }
+            if (firstDescriptor.bytesFilled + bytesWritten > firstDescriptor.byteLength) {
+                throw new RangeError('bytesWritten out of range');
+            }
+        }
+        firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer);
+        ReadableByteStreamControllerRespondInternal(controller, bytesWritten);
+    }
+    function ReadableByteStreamControllerRespondWithNewView(controller, view) {
+        const firstDescriptor = controller._pendingPullIntos.peek();
+        const state = controller._controlledReadableByteStream._state;
+        if (state === 'closed') {
+            if (view.byteLength !== 0) {
+                throw new TypeError('The view\'s length must be 0 when calling respondWithNewView() on a closed stream');
+            }
+        }
+        else {
+            if (view.byteLength === 0) {
+                throw new TypeError('The view\'s length must be greater than 0 when calling respondWithNewView() on a readable stream');
+            }
+        }
+        if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) {
+            throw new RangeError('The region specified by view does not match byobRequest');
+        }
+        if (firstDescriptor.bufferByteLength !== view.buffer.byteLength) {
+            throw new RangeError('The buffer of view has different capacity than byobRequest');
+        }
+        if (firstDescriptor.bytesFilled + view.byteLength > firstDescriptor.byteLength) {
+            throw new RangeError('The region specified by view is larger than byobRequest');
+        }
+        const viewByteLength = view.byteLength;
+        firstDescriptor.buffer = TransferArrayBuffer(view.buffer);
+        ReadableByteStreamControllerRespondInternal(controller, viewByteLength);
+    }
+    function SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize) {
+        controller._controlledReadableByteStream = stream;
+        controller._pullAgain = false;
+        controller._pulling = false;
+        controller._byobRequest = null;
+        // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.
+        controller._queue = controller._queueTotalSize = undefined;
+        ResetQueue(controller);
+        controller._closeRequested = false;
+        controller._started = false;
+        controller._strategyHWM = highWaterMark;
+        controller._pullAlgorithm = pullAlgorithm;
+        controller._cancelAlgorithm = cancelAlgorithm;
+        controller._autoAllocateChunkSize = autoAllocateChunkSize;
+        controller._pendingPullIntos = new SimpleQueue();
+        stream._readableStreamController = controller;
+        const startResult = startAlgorithm();
+        uponPromise(promiseResolvedWith(startResult), () => {
+            controller._started = true;
+            ReadableByteStreamControllerCallPullIfNeeded(controller);
+        }, r => {
+            ReadableByteStreamControllerError(controller, r);
+        });
+    }
+    function SetUpReadableByteStreamControllerFromUnderlyingSource(stream, underlyingByteSource, highWaterMark) {
+        const controller = Object.create(ReadableByteStreamController.prototype);
+        let startAlgorithm = () => undefined;
+        let pullAlgorithm = () => promiseResolvedWith(undefined);
+        let cancelAlgorithm = () => promiseResolvedWith(undefined);
+        if (underlyingByteSource.start !== undefined) {
+            startAlgorithm = () => underlyingByteSource.start(controller);
+        }
+        if (underlyingByteSource.pull !== undefined) {
+            pullAlgorithm = () => underlyingByteSource.pull(controller);
+        }
+        if (underlyingByteSource.cancel !== undefined) {
+            cancelAlgorithm = reason => underlyingByteSource.cancel(reason);
+        }
+        const autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;
+        if (autoAllocateChunkSize === 0) {
+            throw new TypeError('autoAllocateChunkSize must be greater than 0');
+        }
+        SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize);
+    }
+    function SetUpReadableStreamBYOBRequest(request, controller, view) {
+        request._associatedReadableByteStreamController = controller;
+        request._view = view;
+    }
+    // Helper functions for the ReadableStreamBYOBRequest.
+    function byobRequestBrandCheckException(name) {
+        return new TypeError(`ReadableStreamBYOBRequest.prototype.${name} can only be used on a ReadableStreamBYOBRequest`);
+    }
+    // Helper functions for the ReadableByteStreamController.
+    function byteStreamControllerBrandCheckException(name) {
+        return new TypeError(`ReadableByteStreamController.prototype.${name} can only be used on a ReadableByteStreamController`);
+    }
+
+    // Abstract operations for the ReadableStream.
+    function AcquireReadableStreamBYOBReader(stream) {
+        return new ReadableStreamBYOBReader(stream);
+    }
+    // ReadableStream API exposed for controllers.
+    function ReadableStreamAddReadIntoRequest(stream, readIntoRequest) {
+        stream._reader._readIntoRequests.push(readIntoRequest);
+    }
+    function ReadableStreamFulfillReadIntoRequest(stream, chunk, done) {
+        const reader = stream._reader;
+        const readIntoRequest = reader._readIntoRequests.shift();
+        if (done) {
+            readIntoRequest._closeSteps(chunk);
+        }
+        else {
+            readIntoRequest._chunkSteps(chunk);
+        }
+    }
+    function ReadableStreamGetNumReadIntoRequests(stream) {
+        return stream._reader._readIntoRequests.length;
+    }
+    function ReadableStreamHasBYOBReader(stream) {
+        const reader = stream._reader;
+        if (reader === undefined) {
+            return false;
+        }
+        if (!IsReadableStreamBYOBReader(reader)) {
+            return false;
+        }
+        return true;
+    }
+    /**
+     * A BYOB reader vended by a {@link ReadableStream}.
+     *
+     * @public
+     */
+    class ReadableStreamBYOBReader {
+        constructor(stream) {
+            assertRequiredArgument(stream, 1, 'ReadableStreamBYOBReader');
+            assertReadableStream(stream, 'First parameter');
+            if (IsReadableStreamLocked(stream)) {
+                throw new TypeError('This stream has already been locked for exclusive reading by another reader');
+            }
+            if (!IsReadableByteStreamController(stream._readableStreamController)) {
+                throw new TypeError('Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte ' +
+                    'source');
+            }
+            ReadableStreamReaderGenericInitialize(this, stream);
+            this._readIntoRequests = new SimpleQueue();
+        }
+        /**
+         * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or
+         * the reader's lock is released before the stream finishes closing.
+         */
+        get closed() {
+            if (!IsReadableStreamBYOBReader(this)) {
+                return promiseRejectedWith(byobReaderBrandCheckException('closed'));
+            }
+            return this._closedPromise;
+        }
+        /**
+         * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.
+         */
+        cancel(reason = undefined) {
+            if (!IsReadableStreamBYOBReader(this)) {
+                return promiseRejectedWith(byobReaderBrandCheckException('cancel'));
+            }
+            if (this._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('cancel'));
+            }
+            return ReadableStreamReaderGenericCancel(this, reason);
+        }
+        /**
+         * Attempts to reads bytes into view, and returns a promise resolved with the result.
+         *
+         * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.
+         */
+        read(view) {
+            if (!IsReadableStreamBYOBReader(this)) {
+                return promiseRejectedWith(byobReaderBrandCheckException('read'));
+            }
+            if (!ArrayBuffer.isView(view)) {
+                return promiseRejectedWith(new TypeError('view must be an array buffer view'));
+            }
+            if (view.byteLength === 0) {
+                return promiseRejectedWith(new TypeError('view must have non-zero byteLength'));
+            }
+            if (view.buffer.byteLength === 0) {
+                return promiseRejectedWith(new TypeError(`view's buffer must have non-zero byteLength`));
+            }
+            if (IsDetachedBuffer(view.buffer)) ;
+            if (this._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('read from'));
+            }
+            let resolvePromise;
+            let rejectPromise;
+            const promise = newPromise((resolve, reject) => {
+                resolvePromise = resolve;
+                rejectPromise = reject;
+            });
+            const readIntoRequest = {
+                _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),
+                _closeSteps: chunk => resolvePromise({ value: chunk, done: true }),
+                _errorSteps: e => rejectPromise(e)
+            };
+            ReadableStreamBYOBReaderRead(this, view, readIntoRequest);
+            return promise;
+        }
+        /**
+         * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.
+         * If the associated stream is errored when the lock is released, the reader will appear errored in the same way
+         * from now on; otherwise, the reader will appear closed.
+         *
+         * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by
+         * the reader's {@link ReadableStreamBYOBReader.read | read()} method has not yet been settled. Attempting to
+         * do so will throw a `TypeError` and leave the reader locked to the stream.
+         */
+        releaseLock() {
+            if (!IsReadableStreamBYOBReader(this)) {
+                throw byobReaderBrandCheckException('releaseLock');
+            }
+            if (this._ownerReadableStream === undefined) {
+                return;
+            }
+            if (this._readIntoRequests.length > 0) {
+                throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');
+            }
+            ReadableStreamReaderGenericRelease(this);
+        }
+    }
+    Object.defineProperties(ReadableStreamBYOBReader.prototype, {
+        cancel: { enumerable: true },
+        read: { enumerable: true },
+        releaseLock: { enumerable: true },
+        closed: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableStreamBYOBReader.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableStreamBYOBReader',
+            configurable: true
+        });
+    }
+    // Abstract operations for the readers.
+    function IsReadableStreamBYOBReader(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_readIntoRequests')) {
+            return false;
+        }
+        return x instanceof ReadableStreamBYOBReader;
+    }
+    function ReadableStreamBYOBReaderRead(reader, view, readIntoRequest) {
+        const stream = reader._ownerReadableStream;
+        stream._disturbed = true;
+        if (stream._state === 'errored') {
+            readIntoRequest._errorSteps(stream._storedError);
+        }
+        else {
+            ReadableByteStreamControllerPullInto(stream._readableStreamController, view, readIntoRequest);
+        }
+    }
+    // Helper functions for the ReadableStreamBYOBReader.
+    function byobReaderBrandCheckException(name) {
+        return new TypeError(`ReadableStreamBYOBReader.prototype.${name} can only be used on a ReadableStreamBYOBReader`);
+    }
+
+    function ExtractHighWaterMark(strategy, defaultHWM) {
+        const { highWaterMark } = strategy;
+        if (highWaterMark === undefined) {
+            return defaultHWM;
+        }
+        if (NumberIsNaN(highWaterMark) || highWaterMark < 0) {
+            throw new RangeError('Invalid highWaterMark');
+        }
+        return highWaterMark;
+    }
+    function ExtractSizeAlgorithm(strategy) {
+        const { size } = strategy;
+        if (!size) {
+            return () => 1;
+        }
+        return size;
+    }
+
+    function convertQueuingStrategy(init, context) {
+        assertDictionary(init, context);
+        const highWaterMark = init === null || init === void 0 ? void 0 : init.highWaterMark;
+        const size = init === null || init === void 0 ? void 0 : init.size;
+        return {
+            highWaterMark: highWaterMark === undefined ? undefined : convertUnrestrictedDouble(highWaterMark),
+            size: size === undefined ? undefined : convertQueuingStrategySize(size, `${context} has member 'size' that`)
+        };
+    }
+    function convertQueuingStrategySize(fn, context) {
+        assertFunction(fn, context);
+        return chunk => convertUnrestrictedDouble(fn(chunk));
+    }
+
+    function convertUnderlyingSink(original, context) {
+        assertDictionary(original, context);
+        const abort = original === null || original === void 0 ? void 0 : original.abort;
+        const close = original === null || original === void 0 ? void 0 : original.close;
+        const start = original === null || original === void 0 ? void 0 : original.start;
+        const type = original === null || original === void 0 ? void 0 : original.type;
+        const write = original === null || original === void 0 ? void 0 : original.write;
+        return {
+            abort: abort === undefined ?
+                undefined :
+                convertUnderlyingSinkAbortCallback(abort, original, `${context} has member 'abort' that`),
+            close: close === undefined ?
+                undefined :
+                convertUnderlyingSinkCloseCallback(close, original, `${context} has member 'close' that`),
+            start: start === undefined ?
+                undefined :
+                convertUnderlyingSinkStartCallback(start, original, `${context} has member 'start' that`),
+            write: write === undefined ?
+                undefined :
+                convertUnderlyingSinkWriteCallback(write, original, `${context} has member 'write' that`),
+            type
+        };
+    }
+    function convertUnderlyingSinkAbortCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (reason) => promiseCall(fn, original, [reason]);
+    }
+    function convertUnderlyingSinkCloseCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return () => promiseCall(fn, original, []);
+    }
+    function convertUnderlyingSinkStartCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (controller) => reflectCall(fn, original, [controller]);
+    }
+    function convertUnderlyingSinkWriteCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (chunk, controller) => promiseCall(fn, original, [chunk, controller]);
+    }
+
+    function assertWritableStream(x, context) {
+        if (!IsWritableStream(x)) {
+            throw new TypeError(`${context} is not a WritableStream.`);
+        }
+    }
+
+    function isAbortSignal(value) {
+        if (typeof value !== 'object' || value === null) {
+            return false;
+        }
+        try {
+            return typeof value.aborted === 'boolean';
+        }
+        catch (_a) {
+            // AbortSignal.prototype.aborted throws if its brand check fails
+            return false;
+        }
+    }
+    const supportsAbortController = typeof AbortController === 'function';
+    /**
+     * Construct a new AbortController, if supported by the platform.
+     *
+     * @internal
+     */
+    function createAbortController() {
+        if (supportsAbortController) {
+            return new AbortController();
+        }
+        return undefined;
+    }
+
+    /**
+     * A writable stream represents a destination for data, into which you can write.
+     *
+     * @public
+     */
+    class WritableStream {
+        constructor(rawUnderlyingSink = {}, rawStrategy = {}) {
+            if (rawUnderlyingSink === undefined) {
+                rawUnderlyingSink = null;
+            }
+            else {
+                assertObject(rawUnderlyingSink, 'First parameter');
+            }
+            const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');
+            const underlyingSink = convertUnderlyingSink(rawUnderlyingSink, 'First parameter');
+            InitializeWritableStream(this);
+            const type = underlyingSink.type;
+            if (type !== undefined) {
+                throw new RangeError('Invalid type is specified');
+            }
+            const sizeAlgorithm = ExtractSizeAlgorithm(strategy);
+            const highWaterMark = ExtractHighWaterMark(strategy, 1);
+            SetUpWritableStreamDefaultControllerFromUnderlyingSink(this, underlyingSink, highWaterMark, sizeAlgorithm);
+        }
+        /**
+         * Returns whether or not the writable stream is locked to a writer.
+         */
+        get locked() {
+            if (!IsWritableStream(this)) {
+                throw streamBrandCheckException$2('locked');
+            }
+            return IsWritableStreamLocked(this);
+        }
+        /**
+         * Aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be
+         * immediately moved to an errored state, with any queued-up writes discarded. This will also execute any abort
+         * mechanism of the underlying sink.
+         *
+         * The returned promise will fulfill if the stream shuts down successfully, or reject if the underlying sink signaled
+         * that there was an error doing so. Additionally, it will reject with a `TypeError` (without attempting to cancel
+         * the stream) if the stream is currently locked.
+         */
+        abort(reason = undefined) {
+            if (!IsWritableStream(this)) {
+                return promiseRejectedWith(streamBrandCheckException$2('abort'));
+            }
+            if (IsWritableStreamLocked(this)) {
+                return promiseRejectedWith(new TypeError('Cannot abort a stream that already has a writer'));
+            }
+            return WritableStreamAbort(this, reason);
+        }
+        /**
+         * Closes the stream. The underlying sink will finish processing any previously-written chunks, before invoking its
+         * close behavior. During this time any further attempts to write will fail (without erroring the stream).
+         *
+         * The method returns a promise that will fulfill if all remaining chunks are successfully written and the stream
+         * successfully closes, or rejects if an error is encountered during this process. Additionally, it will reject with
+         * a `TypeError` (without attempting to cancel the stream) if the stream is currently locked.
+         */
+        close() {
+            if (!IsWritableStream(this)) {
+                return promiseRejectedWith(streamBrandCheckException$2('close'));
+            }
+            if (IsWritableStreamLocked(this)) {
+                return promiseRejectedWith(new TypeError('Cannot close a stream that already has a writer'));
+            }
+            if (WritableStreamCloseQueuedOrInFlight(this)) {
+                return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));
+            }
+            return WritableStreamClose(this);
+        }
+        /**
+         * Creates a {@link WritableStreamDefaultWriter | writer} and locks the stream to the new writer. While the stream
+         * is locked, no other writer can be acquired until this one is released.
+         *
+         * This functionality is especially useful for creating abstractions that desire the ability to write to a stream
+         * without interruption or interleaving. By getting a writer for the stream, you can ensure nobody else can write at
+         * the same time, which would cause the resulting written data to be unpredictable and probably useless.
+         */
+        getWriter() {
+            if (!IsWritableStream(this)) {
+                throw streamBrandCheckException$2('getWriter');
+            }
+            return AcquireWritableStreamDefaultWriter(this);
+        }
+    }
+    Object.defineProperties(WritableStream.prototype, {
+        abort: { enumerable: true },
+        close: { enumerable: true },
+        getWriter: { enumerable: true },
+        locked: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(WritableStream.prototype, SymbolPolyfill.toStringTag, {
+            value: 'WritableStream',
+            configurable: true
+        });
+    }
+    // Abstract operations for the WritableStream.
+    function AcquireWritableStreamDefaultWriter(stream) {
+        return new WritableStreamDefaultWriter(stream);
+    }
+    // Throws if and only if startAlgorithm throws.
+    function CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark = 1, sizeAlgorithm = () => 1) {
+        const stream = Object.create(WritableStream.prototype);
+        InitializeWritableStream(stream);
+        const controller = Object.create(WritableStreamDefaultController.prototype);
+        SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm);
+        return stream;
+    }
+    function InitializeWritableStream(stream) {
+        stream._state = 'writable';
+        // The error that will be reported by new method calls once the state becomes errored. Only set when [[state]] is
+        // 'erroring' or 'errored'. May be set to an undefined value.
+        stream._storedError = undefined;
+        stream._writer = undefined;
+        // Initialize to undefined first because the constructor of the controller checks this
+        // variable to validate the caller.
+        stream._writableStreamController = undefined;
+        // This queue is placed here instead of the writer class in order to allow for passing a writer to the next data
+        // producer without waiting for the queued writes to finish.
+        stream._writeRequests = new SimpleQueue();
+        // Write requests are removed from _writeRequests when write() is called on the underlying sink. This prevents
+        // them from being erroneously rejected on error. If a write() call is in-flight, the request is stored here.
+        stream._inFlightWriteRequest = undefined;
+        // The promise that was returned from writer.close(). Stored here because it may be fulfilled after the writer
+        // has been detached.
+        stream._closeRequest = undefined;
+        // Close request is removed from _closeRequest when close() is called on the underlying sink. This prevents it
+        // from being erroneously rejected on error. If a close() call is in-flight, the request is stored here.
+        stream._inFlightCloseRequest = undefined;
+        // The promise that was returned from writer.abort(). This may also be fulfilled after the writer has detached.
+        stream._pendingAbortRequest = undefined;
+        // The backpressure signal set by the controller.
+        stream._backpressure = false;
+    }
+    function IsWritableStream(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_writableStreamController')) {
+            return false;
+        }
+        return x instanceof WritableStream;
+    }
+    function IsWritableStreamLocked(stream) {
+        if (stream._writer === undefined) {
+            return false;
+        }
+        return true;
+    }
+    function WritableStreamAbort(stream, reason) {
+        var _a;
+        if (stream._state === 'closed' || stream._state === 'errored') {
+            return promiseResolvedWith(undefined);
+        }
+        stream._writableStreamController._abortReason = reason;
+        (_a = stream._writableStreamController._abortController) === null || _a === void 0 ? void 0 : _a.abort();
+        // TypeScript narrows the type of `stream._state` down to 'writable' | 'erroring',
+        // but it doesn't know that signaling abort runs author code that might have changed the state.
+        // Widen the type again by casting to WritableStreamState.
+        const state = stream._state;
+        if (state === 'closed' || state === 'errored') {
+            return promiseResolvedWith(undefined);
+        }
+        if (stream._pendingAbortRequest !== undefined) {
+            return stream._pendingAbortRequest._promise;
+        }
+        let wasAlreadyErroring = false;
+        if (state === 'erroring') {
+            wasAlreadyErroring = true;
+            // reason will not be used, so don't keep a reference to it.
+            reason = undefined;
+        }
+        const promise = newPromise((resolve, reject) => {
+            stream._pendingAbortRequest = {
+                _promise: undefined,
+                _resolve: resolve,
+                _reject: reject,
+                _reason: reason,
+                _wasAlreadyErroring: wasAlreadyErroring
+            };
+        });
+        stream._pendingAbortRequest._promise = promise;
+        if (!wasAlreadyErroring) {
+            WritableStreamStartErroring(stream, reason);
+        }
+        return promise;
+    }
+    function WritableStreamClose(stream) {
+        const state = stream._state;
+        if (state === 'closed' || state === 'errored') {
+            return promiseRejectedWith(new TypeError(`The stream (in ${state} state) is not in the writable state and cannot be closed`));
+        }
+        const promise = newPromise((resolve, reject) => {
+            const closeRequest = {
+                _resolve: resolve,
+                _reject: reject
+            };
+            stream._closeRequest = closeRequest;
+        });
+        const writer = stream._writer;
+        if (writer !== undefined && stream._backpressure && state === 'writable') {
+            defaultWriterReadyPromiseResolve(writer);
+        }
+        WritableStreamDefaultControllerClose(stream._writableStreamController);
+        return promise;
+    }
+    // WritableStream API exposed for controllers.
+    function WritableStreamAddWriteRequest(stream) {
+        const promise = newPromise((resolve, reject) => {
+            const writeRequest = {
+                _resolve: resolve,
+                _reject: reject
+            };
+            stream._writeRequests.push(writeRequest);
+        });
+        return promise;
+    }
+    function WritableStreamDealWithRejection(stream, error) {
+        const state = stream._state;
+        if (state === 'writable') {
+            WritableStreamStartErroring(stream, error);
+            return;
+        }
+        WritableStreamFinishErroring(stream);
+    }
+    function WritableStreamStartErroring(stream, reason) {
+        const controller = stream._writableStreamController;
+        stream._state = 'erroring';
+        stream._storedError = reason;
+        const writer = stream._writer;
+        if (writer !== undefined) {
+            WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);
+        }
+        if (!WritableStreamHasOperationMarkedInFlight(stream) && controller._started) {
+            WritableStreamFinishErroring(stream);
+        }
+    }
+    function WritableStreamFinishErroring(stream) {
+        stream._state = 'errored';
+        stream._writableStreamController[ErrorSteps]();
+        const storedError = stream._storedError;
+        stream._writeRequests.forEach(writeRequest => {
+            writeRequest._reject(storedError);
+        });
+        stream._writeRequests = new SimpleQueue();
+        if (stream._pendingAbortRequest === undefined) {
+            WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+            return;
+        }
+        const abortRequest = stream._pendingAbortRequest;
+        stream._pendingAbortRequest = undefined;
+        if (abortRequest._wasAlreadyErroring) {
+            abortRequest._reject(storedError);
+            WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+            return;
+        }
+        const promise = stream._writableStreamController[AbortSteps](abortRequest._reason);
+        uponPromise(promise, () => {
+            abortRequest._resolve();
+            WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+        }, (reason) => {
+            abortRequest._reject(reason);
+            WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+        });
+    }
+    function WritableStreamFinishInFlightWrite(stream) {
+        stream._inFlightWriteRequest._resolve(undefined);
+        stream._inFlightWriteRequest = undefined;
+    }
+    function WritableStreamFinishInFlightWriteWithError(stream, error) {
+        stream._inFlightWriteRequest._reject(error);
+        stream._inFlightWriteRequest = undefined;
+        WritableStreamDealWithRejection(stream, error);
+    }
+    function WritableStreamFinishInFlightClose(stream) {
+        stream._inFlightCloseRequest._resolve(undefined);
+        stream._inFlightCloseRequest = undefined;
+        const state = stream._state;
+        if (state === 'erroring') {
+            // The error was too late to do anything, so it is ignored.
+            stream._storedError = undefined;
+            if (stream._pendingAbortRequest !== undefined) {
+                stream._pendingAbortRequest._resolve();
+                stream._pendingAbortRequest = undefined;
+            }
+        }
+        stream._state = 'closed';
+        const writer = stream._writer;
+        if (writer !== undefined) {
+            defaultWriterClosedPromiseResolve(writer);
+        }
+    }
+    function WritableStreamFinishInFlightCloseWithError(stream, error) {
+        stream._inFlightCloseRequest._reject(error);
+        stream._inFlightCloseRequest = undefined;
+        // Never execute sink abort() after sink close().
+        if (stream._pendingAbortRequest !== undefined) {
+            stream._pendingAbortRequest._reject(error);
+            stream._pendingAbortRequest = undefined;
+        }
+        WritableStreamDealWithRejection(stream, error);
+    }
+    // TODO(ricea): Fix alphabetical order.
+    function WritableStreamCloseQueuedOrInFlight(stream) {
+        if (stream._closeRequest === undefined && stream._inFlightCloseRequest === undefined) {
+            return false;
+        }
+        return true;
+    }
+    function WritableStreamHasOperationMarkedInFlight(stream) {
+        if (stream._inFlightWriteRequest === undefined && stream._inFlightCloseRequest === undefined) {
+            return false;
+        }
+        return true;
+    }
+    function WritableStreamMarkCloseRequestInFlight(stream) {
+        stream._inFlightCloseRequest = stream._closeRequest;
+        stream._closeRequest = undefined;
+    }
+    function WritableStreamMarkFirstWriteRequestInFlight(stream) {
+        stream._inFlightWriteRequest = stream._writeRequests.shift();
+    }
+    function WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream) {
+        if (stream._closeRequest !== undefined) {
+            stream._closeRequest._reject(stream._storedError);
+            stream._closeRequest = undefined;
+        }
+        const writer = stream._writer;
+        if (writer !== undefined) {
+            defaultWriterClosedPromiseReject(writer, stream._storedError);
+        }
+    }
+    function WritableStreamUpdateBackpressure(stream, backpressure) {
+        const writer = stream._writer;
+        if (writer !== undefined && backpressure !== stream._backpressure) {
+            if (backpressure) {
+                defaultWriterReadyPromiseReset(writer);
+            }
+            else {
+                defaultWriterReadyPromiseResolve(writer);
+            }
+        }
+        stream._backpressure = backpressure;
+    }
+    /**
+     * A default writer vended by a {@link WritableStream}.
+     *
+     * @public
+     */
+    class WritableStreamDefaultWriter {
+        constructor(stream) {
+            assertRequiredArgument(stream, 1, 'WritableStreamDefaultWriter');
+            assertWritableStream(stream, 'First parameter');
+            if (IsWritableStreamLocked(stream)) {
+                throw new TypeError('This stream has already been locked for exclusive writing by another writer');
+            }
+            this._ownerWritableStream = stream;
+            stream._writer = this;
+            const state = stream._state;
+            if (state === 'writable') {
+                if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._backpressure) {
+                    defaultWriterReadyPromiseInitialize(this);
+                }
+                else {
+                    defaultWriterReadyPromiseInitializeAsResolved(this);
+                }
+                defaultWriterClosedPromiseInitialize(this);
+            }
+            else if (state === 'erroring') {
+                defaultWriterReadyPromiseInitializeAsRejected(this, stream._storedError);
+                defaultWriterClosedPromiseInitialize(this);
+            }
+            else if (state === 'closed') {
+                defaultWriterReadyPromiseInitializeAsResolved(this);
+                defaultWriterClosedPromiseInitializeAsResolved(this);
+            }
+            else {
+                const storedError = stream._storedError;
+                defaultWriterReadyPromiseInitializeAsRejected(this, storedError);
+                defaultWriterClosedPromiseInitializeAsRejected(this, storedError);
+            }
+        }
+        /**
+         * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or
+         * the writer’s lock is released before the stream finishes closing.
+         */
+        get closed() {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                return promiseRejectedWith(defaultWriterBrandCheckException('closed'));
+            }
+            return this._closedPromise;
+        }
+        /**
+         * Returns the desired size to fill the stream’s internal queue. It can be negative, if the queue is over-full.
+         * A producer can use this information to determine the right amount of data to write.
+         *
+         * It will be `null` if the stream cannot be successfully written to (due to either being errored, or having an abort
+         * queued up). It will return zero if the stream is closed. And the getter will throw an exception if invoked when
+         * the writer’s lock is released.
+         */
+        get desiredSize() {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                throw defaultWriterBrandCheckException('desiredSize');
+            }
+            if (this._ownerWritableStream === undefined) {
+                throw defaultWriterLockException('desiredSize');
+            }
+            return WritableStreamDefaultWriterGetDesiredSize(this);
+        }
+        /**
+         * Returns a promise that will be fulfilled when the desired size to fill the stream’s internal queue transitions
+         * from non-positive to positive, signaling that it is no longer applying backpressure. Once the desired size dips
+         * back to zero or below, the getter will return a new promise that stays pending until the next transition.
+         *
+         * If the stream becomes errored or aborted, or the writer’s lock is released, the returned promise will become
+         * rejected.
+         */
+        get ready() {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                return promiseRejectedWith(defaultWriterBrandCheckException('ready'));
+            }
+            return this._readyPromise;
+        }
+        /**
+         * If the reader is active, behaves the same as {@link WritableStream.abort | stream.abort(reason)}.
+         */
+        abort(reason = undefined) {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                return promiseRejectedWith(defaultWriterBrandCheckException('abort'));
+            }
+            if (this._ownerWritableStream === undefined) {
+                return promiseRejectedWith(defaultWriterLockException('abort'));
+            }
+            return WritableStreamDefaultWriterAbort(this, reason);
+        }
+        /**
+         * If the reader is active, behaves the same as {@link WritableStream.close | stream.close()}.
+         */
+        close() {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                return promiseRejectedWith(defaultWriterBrandCheckException('close'));
+            }
+            const stream = this._ownerWritableStream;
+            if (stream === undefined) {
+                return promiseRejectedWith(defaultWriterLockException('close'));
+            }
+            if (WritableStreamCloseQueuedOrInFlight(stream)) {
+                return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));
+            }
+            return WritableStreamDefaultWriterClose(this);
+        }
+        /**
+         * Releases the writer’s lock on the corresponding stream. After the lock is released, the writer is no longer active.
+         * If the associated stream is errored when the lock is released, the writer will appear errored in the same way from
+         * now on; otherwise, the writer will appear closed.
+         *
+         * Note that the lock can still be released even if some ongoing writes have not yet finished (i.e. even if the
+         * promises returned from previous calls to {@link WritableStreamDefaultWriter.write | write()} have not yet settled).
+         * It’s not necessary to hold the lock on the writer for the duration of the write; the lock instead simply prevents
+         * other producers from writing in an interleaved manner.
+         */
+        releaseLock() {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                throw defaultWriterBrandCheckException('releaseLock');
+            }
+            const stream = this._ownerWritableStream;
+            if (stream === undefined) {
+                return;
+            }
+            WritableStreamDefaultWriterRelease(this);
+        }
+        write(chunk = undefined) {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                return promiseRejectedWith(defaultWriterBrandCheckException('write'));
+            }
+            if (this._ownerWritableStream === undefined) {
+                return promiseRejectedWith(defaultWriterLockException('write to'));
+            }
+            return WritableStreamDefaultWriterWrite(this, chunk);
+        }
+    }
+    Object.defineProperties(WritableStreamDefaultWriter.prototype, {
+        abort: { enumerable: true },
+        close: { enumerable: true },
+        releaseLock: { enumerable: true },
+        write: { enumerable: true },
+        closed: { enumerable: true },
+        desiredSize: { enumerable: true },
+        ready: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(WritableStreamDefaultWriter.prototype, SymbolPolyfill.toStringTag, {
+            value: 'WritableStreamDefaultWriter',
+            configurable: true
+        });
+    }
+    // Abstract operations for the WritableStreamDefaultWriter.
+    function IsWritableStreamDefaultWriter(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) {
+            return false;
+        }
+        return x instanceof WritableStreamDefaultWriter;
+    }
+    // A client of WritableStreamDefaultWriter may use these functions directly to bypass state check.
+    function WritableStreamDefaultWriterAbort(writer, reason) {
+        const stream = writer._ownerWritableStream;
+        return WritableStreamAbort(stream, reason);
+    }
+    function WritableStreamDefaultWriterClose(writer) {
+        const stream = writer._ownerWritableStream;
+        return WritableStreamClose(stream);
+    }
+    function WritableStreamDefaultWriterCloseWithErrorPropagation(writer) {
+        const stream = writer._ownerWritableStream;
+        const state = stream._state;
+        if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {
+            return promiseResolvedWith(undefined);
+        }
+        if (state === 'errored') {
+            return promiseRejectedWith(stream._storedError);
+        }
+        return WritableStreamDefaultWriterClose(writer);
+    }
+    function WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, error) {
+        if (writer._closedPromiseState === 'pending') {
+            defaultWriterClosedPromiseReject(writer, error);
+        }
+        else {
+            defaultWriterClosedPromiseResetToRejected(writer, error);
+        }
+    }
+    function WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, error) {
+        if (writer._readyPromiseState === 'pending') {
+            defaultWriterReadyPromiseReject(writer, error);
+        }
+        else {
+            defaultWriterReadyPromiseResetToRejected(writer, error);
+        }
+    }
+    function WritableStreamDefaultWriterGetDesiredSize(writer) {
+        const stream = writer._ownerWritableStream;
+        const state = stream._state;
+        if (state === 'errored' || state === 'erroring') {
+            return null;
+        }
+        if (state === 'closed') {
+            return 0;
+        }
+        return WritableStreamDefaultControllerGetDesiredSize(stream._writableStreamController);
+    }
+    function WritableStreamDefaultWriterRelease(writer) {
+        const stream = writer._ownerWritableStream;
+        const releasedError = new TypeError(`Writer was released and can no longer be used to monitor the stream's closedness`);
+        WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, releasedError);
+        // The state transitions to "errored" before the sink abort() method runs, but the writer.closed promise is not
+        // rejected until afterwards. This means that simply testing state will not work.
+        WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, releasedError);
+        stream._writer = undefined;
+        writer._ownerWritableStream = undefined;
+    }
+    function WritableStreamDefaultWriterWrite(writer, chunk) {
+        const stream = writer._ownerWritableStream;
+        const controller = stream._writableStreamController;
+        const chunkSize = WritableStreamDefaultControllerGetChunkSize(controller, chunk);
+        if (stream !== writer._ownerWritableStream) {
+            return promiseRejectedWith(defaultWriterLockException('write to'));
+        }
+        const state = stream._state;
+        if (state === 'errored') {
+            return promiseRejectedWith(stream._storedError);
+        }
+        if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {
+            return promiseRejectedWith(new TypeError('The stream is closing or closed and cannot be written to'));
+        }
+        if (state === 'erroring') {
+            return promiseRejectedWith(stream._storedError);
+        }
+        const promise = WritableStreamAddWriteRequest(stream);
+        WritableStreamDefaultControllerWrite(controller, chunk, chunkSize);
+        return promise;
+    }
+    const closeSentinel = {};
+    /**
+     * Allows control of a {@link WritableStream | writable stream}'s state and internal queue.
+     *
+     * @public
+     */
+    class WritableStreamDefaultController {
+        constructor() {
+            throw new TypeError('Illegal constructor');
+        }
+        /**
+         * The reason which was passed to `WritableStream.abort(reason)` when the stream was aborted.
+         *
+         * @deprecated
+         *  This property has been removed from the specification, see https://github.com/whatwg/streams/pull/1177.
+         *  Use {@link WritableStreamDefaultController.signal}'s `reason` instead.
+         */
+        get abortReason() {
+            if (!IsWritableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$2('abortReason');
+            }
+            return this._abortReason;
+        }
+        /**
+         * An `AbortSignal` that can be used to abort the pending write or close operation when the stream is aborted.
+         */
+        get signal() {
+            if (!IsWritableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$2('signal');
+            }
+            if (this._abortController === undefined) {
+                // Older browsers or older Node versions may not support `AbortController` or `AbortSignal`.
+                // We don't want to bundle and ship an `AbortController` polyfill together with our polyfill,
+                // so instead we only implement support for `signal` if we find a global `AbortController` constructor.
+                throw new TypeError('WritableStreamDefaultController.prototype.signal is not supported');
+            }
+            return this._abortController.signal;
+        }
+        /**
+         * Closes the controlled writable stream, making all future interactions with it fail with the given error `e`.
+         *
+         * This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying
+         * sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the
+         * normal lifecycle of interactions with the underlying sink.
+         */
+        error(e = undefined) {
+            if (!IsWritableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$2('error');
+            }
+            const state = this._controlledWritableStream._state;
+            if (state !== 'writable') {
+                // The stream is closed, errored or will be soon. The sink can't do anything useful if it gets an error here, so
+                // just treat it as a no-op.
+                return;
+            }
+            WritableStreamDefaultControllerError(this, e);
+        }
+        /** @internal */
+        [AbortSteps](reason) {
+            const result = this._abortAlgorithm(reason);
+            WritableStreamDefaultControllerClearAlgorithms(this);
+            return result;
+        }
+        /** @internal */
+        [ErrorSteps]() {
+            ResetQueue(this);
+        }
+    }
+    Object.defineProperties(WritableStreamDefaultController.prototype, {
+        abortReason: { enumerable: true },
+        signal: { enumerable: true },
+        error: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(WritableStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+            value: 'WritableStreamDefaultController',
+            configurable: true
+        });
+    }
+    // Abstract operations implementing interface required by the WritableStream.
+    function IsWritableStreamDefaultController(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_controlledWritableStream')) {
+            return false;
+        }
+        return x instanceof WritableStreamDefaultController;
+    }
+    function SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm) {
+        controller._controlledWritableStream = stream;
+        stream._writableStreamController = controller;
+        // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.
+        controller._queue = undefined;
+        controller._queueTotalSize = undefined;
+        ResetQueue(controller);
+        controller._abortReason = undefined;
+        controller._abortController = createAbortController();
+        controller._started = false;
+        controller._strategySizeAlgorithm = sizeAlgorithm;
+        controller._strategyHWM = highWaterMark;
+        controller._writeAlgorithm = writeAlgorithm;
+        controller._closeAlgorithm = closeAlgorithm;
+        controller._abortAlgorithm = abortAlgorithm;
+        const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+        WritableStreamUpdateBackpressure(stream, backpressure);
+        const startResult = startAlgorithm();
+        const startPromise = promiseResolvedWith(startResult);
+        uponPromise(startPromise, () => {
+            controller._started = true;
+            WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+        }, r => {
+            controller._started = true;
+            WritableStreamDealWithRejection(stream, r);
+        });
+    }
+    function SetUpWritableStreamDefaultControllerFromUnderlyingSink(stream, underlyingSink, highWaterMark, sizeAlgorithm) {
+        const controller = Object.create(WritableStreamDefaultController.prototype);
+        let startAlgorithm = () => undefined;
+        let writeAlgorithm = () => promiseResolvedWith(undefined);
+        let closeAlgorithm = () => promiseResolvedWith(undefined);
+        let abortAlgorithm = () => promiseResolvedWith(undefined);
+        if (underlyingSink.start !== undefined) {
+            startAlgorithm = () => underlyingSink.start(controller);
+        }
+        if (underlyingSink.write !== undefined) {
+            writeAlgorithm = chunk => underlyingSink.write(chunk, controller);
+        }
+        if (underlyingSink.close !== undefined) {
+            closeAlgorithm = () => underlyingSink.close();
+        }
+        if (underlyingSink.abort !== undefined) {
+            abortAlgorithm = reason => underlyingSink.abort(reason);
+        }
+        SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm);
+    }
+    // ClearAlgorithms may be called twice. Erroring the same stream in multiple ways will often result in redundant calls.
+    function WritableStreamDefaultControllerClearAlgorithms(controller) {
+        controller._writeAlgorithm = undefined;
+        controller._closeAlgorithm = undefined;
+        controller._abortAlgorithm = undefined;
+        controller._strategySizeAlgorithm = undefined;
+    }
+    function WritableStreamDefaultControllerClose(controller) {
+        EnqueueValueWithSize(controller, closeSentinel, 0);
+        WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+    }
+    function WritableStreamDefaultControllerGetChunkSize(controller, chunk) {
+        try {
+            return controller._strategySizeAlgorithm(chunk);
+        }
+        catch (chunkSizeE) {
+            WritableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE);
+            return 1;
+        }
+    }
+    function WritableStreamDefaultControllerGetDesiredSize(controller) {
+        return controller._strategyHWM - controller._queueTotalSize;
+    }
+    function WritableStreamDefaultControllerWrite(controller, chunk, chunkSize) {
+        try {
+            EnqueueValueWithSize(controller, chunk, chunkSize);
+        }
+        catch (enqueueE) {
+            WritableStreamDefaultControllerErrorIfNeeded(controller, enqueueE);
+            return;
+        }
+        const stream = controller._controlledWritableStream;
+        if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._state === 'writable') {
+            const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+            WritableStreamUpdateBackpressure(stream, backpressure);
+        }
+        WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+    }
+    // Abstract operations for the WritableStreamDefaultController.
+    function WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller) {
+        const stream = controller._controlledWritableStream;
+        if (!controller._started) {
+            return;
+        }
+        if (stream._inFlightWriteRequest !== undefined) {
+            return;
+        }
+        const state = stream._state;
+        if (state === 'erroring') {
+            WritableStreamFinishErroring(stream);
+            return;
+        }
+        if (controller._queue.length === 0) {
+            return;
+        }
+        const value = PeekQueueValue(controller);
+        if (value === closeSentinel) {
+            WritableStreamDefaultControllerProcessClose(controller);
+        }
+        else {
+            WritableStreamDefaultControllerProcessWrite(controller, value);
+        }
+    }
+    function WritableStreamDefaultControllerErrorIfNeeded(controller, error) {
+        if (controller._controlledWritableStream._state === 'writable') {
+            WritableStreamDefaultControllerError(controller, error);
+        }
+    }
+    function WritableStreamDefaultControllerProcessClose(controller) {
+        const stream = controller._controlledWritableStream;
+        WritableStreamMarkCloseRequestInFlight(stream);
+        DequeueValue(controller);
+        const sinkClosePromise = controller._closeAlgorithm();
+        WritableStreamDefaultControllerClearAlgorithms(controller);
+        uponPromise(sinkClosePromise, () => {
+            WritableStreamFinishInFlightClose(stream);
+        }, reason => {
+            WritableStreamFinishInFlightCloseWithError(stream, reason);
+        });
+    }
+    function WritableStreamDefaultControllerProcessWrite(controller, chunk) {
+        const stream = controller._controlledWritableStream;
+        WritableStreamMarkFirstWriteRequestInFlight(stream);
+        const sinkWritePromise = controller._writeAlgorithm(chunk);
+        uponPromise(sinkWritePromise, () => {
+            WritableStreamFinishInFlightWrite(stream);
+            const state = stream._state;
+            DequeueValue(controller);
+            if (!WritableStreamCloseQueuedOrInFlight(stream) && state === 'writable') {
+                const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+                WritableStreamUpdateBackpressure(stream, backpressure);
+            }
+            WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+        }, reason => {
+            if (stream._state === 'writable') {
+                WritableStreamDefaultControllerClearAlgorithms(controller);
+            }
+            WritableStreamFinishInFlightWriteWithError(stream, reason);
+        });
+    }
+    function WritableStreamDefaultControllerGetBackpressure(controller) {
+        const desiredSize = WritableStreamDefaultControllerGetDesiredSize(controller);
+        return desiredSize <= 0;
+    }
+    // A client of WritableStreamDefaultController may use these functions directly to bypass state check.
+    function WritableStreamDefaultControllerError(controller, error) {
+        const stream = controller._controlledWritableStream;
+        WritableStreamDefaultControllerClearAlgorithms(controller);
+        WritableStreamStartErroring(stream, error);
+    }
+    // Helper functions for the WritableStream.
+    function streamBrandCheckException$2(name) {
+        return new TypeError(`WritableStream.prototype.${name} can only be used on a WritableStream`);
+    }
+    // Helper functions for the WritableStreamDefaultController.
+    function defaultControllerBrandCheckException$2(name) {
+        return new TypeError(`WritableStreamDefaultController.prototype.${name} can only be used on a WritableStreamDefaultController`);
+    }
+    // Helper functions for the WritableStreamDefaultWriter.
+    function defaultWriterBrandCheckException(name) {
+        return new TypeError(`WritableStreamDefaultWriter.prototype.${name} can only be used on a WritableStreamDefaultWriter`);
+    }
+    function defaultWriterLockException(name) {
+        return new TypeError('Cannot ' + name + ' a stream using a released writer');
+    }
+    function defaultWriterClosedPromiseInitialize(writer) {
+        writer._closedPromise = newPromise((resolve, reject) => {
+            writer._closedPromise_resolve = resolve;
+            writer._closedPromise_reject = reject;
+            writer._closedPromiseState = 'pending';
+        });
+    }
+    function defaultWriterClosedPromiseInitializeAsRejected(writer, reason) {
+        defaultWriterClosedPromiseInitialize(writer);
+        defaultWriterClosedPromiseReject(writer, reason);
+    }
+    function defaultWriterClosedPromiseInitializeAsResolved(writer) {
+        defaultWriterClosedPromiseInitialize(writer);
+        defaultWriterClosedPromiseResolve(writer);
+    }
+    function defaultWriterClosedPromiseReject(writer, reason) {
+        if (writer._closedPromise_reject === undefined) {
+            return;
+        }
+        setPromiseIsHandledToTrue(writer._closedPromise);
+        writer._closedPromise_reject(reason);
+        writer._closedPromise_resolve = undefined;
+        writer._closedPromise_reject = undefined;
+        writer._closedPromiseState = 'rejected';
+    }
+    function defaultWriterClosedPromiseResetToRejected(writer, reason) {
+        defaultWriterClosedPromiseInitializeAsRejected(writer, reason);
+    }
+    function defaultWriterClosedPromiseResolve(writer) {
+        if (writer._closedPromise_resolve === undefined) {
+            return;
+        }
+        writer._closedPromise_resolve(undefined);
+        writer._closedPromise_resolve = undefined;
+        writer._closedPromise_reject = undefined;
+        writer._closedPromiseState = 'resolved';
+    }
+    function defaultWriterReadyPromiseInitialize(writer) {
+        writer._readyPromise = newPromise((resolve, reject) => {
+            writer._readyPromise_resolve = resolve;
+            writer._readyPromise_reject = reject;
+        });
+        writer._readyPromiseState = 'pending';
+    }
+    function defaultWriterReadyPromiseInitializeAsRejected(writer, reason) {
+        defaultWriterReadyPromiseInitialize(writer);
+        defaultWriterReadyPromiseReject(writer, reason);
+    }
+    function defaultWriterReadyPromiseInitializeAsResolved(writer) {
+        defaultWriterReadyPromiseInitialize(writer);
+        defaultWriterReadyPromiseResolve(writer);
+    }
+    function defaultWriterReadyPromiseReject(writer, reason) {
+        if (writer._readyPromise_reject === undefined) {
+            return;
+        }
+        setPromiseIsHandledToTrue(writer._readyPromise);
+        writer._readyPromise_reject(reason);
+        writer._readyPromise_resolve = undefined;
+        writer._readyPromise_reject = undefined;
+        writer._readyPromiseState = 'rejected';
+    }
+    function defaultWriterReadyPromiseReset(writer) {
+        defaultWriterReadyPromiseInitialize(writer);
+    }
+    function defaultWriterReadyPromiseResetToRejected(writer, reason) {
+        defaultWriterReadyPromiseInitializeAsRejected(writer, reason);
+    }
+    function defaultWriterReadyPromiseResolve(writer) {
+        if (writer._readyPromise_resolve === undefined) {
+            return;
+        }
+        writer._readyPromise_resolve(undefined);
+        writer._readyPromise_resolve = undefined;
+        writer._readyPromise_reject = undefined;
+        writer._readyPromiseState = 'fulfilled';
+    }
+
+    /// <reference lib="dom" />
+    const NativeDOMException = typeof DOMException !== 'undefined' ? DOMException : undefined;
+
+    /// <reference types="node" />
+    function isDOMExceptionConstructor(ctor) {
+        if (!(typeof ctor === 'function' || typeof ctor === 'object')) {
+            return false;
+        }
+        try {
+            new ctor();
+            return true;
+        }
+        catch (_a) {
+            return false;
+        }
+    }
+    function createDOMExceptionPolyfill() {
+        // eslint-disable-next-line no-shadow
+        const ctor = function DOMException(message, name) {
+            this.message = message || '';
+            this.name = name || 'Error';
+            if (Error.captureStackTrace) {
+                Error.captureStackTrace(this, this.constructor);
+            }
+        };
+        ctor.prototype = Object.create(Error.prototype);
+        Object.defineProperty(ctor.prototype, 'constructor', { value: ctor, writable: true, configurable: true });
+        return ctor;
+    }
+    // eslint-disable-next-line no-redeclare
+    const DOMException$1 = isDOMExceptionConstructor(NativeDOMException) ? NativeDOMException : createDOMExceptionPolyfill();
+
+    function ReadableStreamPipeTo(source, dest, preventClose, preventAbort, preventCancel, signal) {
+        const reader = AcquireReadableStreamDefaultReader(source);
+        const writer = AcquireWritableStreamDefaultWriter(dest);
+        source._disturbed = true;
+        let shuttingDown = false;
+        // This is used to keep track of the spec's requirement that we wait for ongoing writes during shutdown.
+        let currentWrite = promiseResolvedWith(undefined);
+        return newPromise((resolve, reject) => {
+            let abortAlgorithm;
+            if (signal !== undefined) {
+                abortAlgorithm = () => {
+                    const error = new DOMException$1('Aborted', 'AbortError');
+                    const actions = [];
+                    if (!preventAbort) {
+                        actions.push(() => {
+                            if (dest._state === 'writable') {
+                                return WritableStreamAbort(dest, error);
+                            }
+                            return promiseResolvedWith(undefined);
+                        });
+                    }
+                    if (!preventCancel) {
+                        actions.push(() => {
+                            if (source._state === 'readable') {
+                                return ReadableStreamCancel(source, error);
+                            }
+                            return promiseResolvedWith(undefined);
+                        });
+                    }
+                    shutdownWithAction(() => Promise.all(actions.map(action => action())), true, error);
+                };
+                if (signal.aborted) {
+                    abortAlgorithm();
+                    return;
+                }
+                signal.addEventListener('abort', abortAlgorithm);
+            }
+            // Using reader and writer, read all chunks from this and write them to dest
+            // - Backpressure must be enforced
+            // - Shutdown must stop all activity
+            function pipeLoop() {
+                return newPromise((resolveLoop, rejectLoop) => {
+                    function next(done) {
+                        if (done) {
+                            resolveLoop();
+                        }
+                        else {
+                            // Use `PerformPromiseThen` instead of `uponPromise` to avoid
+                            // adding unnecessary `.catch(rethrowAssertionErrorRejection)` handlers
+                            PerformPromiseThen(pipeStep(), next, rejectLoop);
+                        }
+                    }
+                    next(false);
+                });
+            }
+            function pipeStep() {
+                if (shuttingDown) {
+                    return promiseResolvedWith(true);
+                }
+                return PerformPromiseThen(writer._readyPromise, () => {
+                    return newPromise((resolveRead, rejectRead) => {
+                        ReadableStreamDefaultReaderRead(reader, {
+                            _chunkSteps: chunk => {
+                                currentWrite = PerformPromiseThen(WritableStreamDefaultWriterWrite(writer, chunk), undefined, noop);
+                                resolveRead(false);
+                            },
+                            _closeSteps: () => resolveRead(true),
+                            _errorSteps: rejectRead
+                        });
+                    });
+                });
+            }
+            // Errors must be propagated forward
+            isOrBecomesErrored(source, reader._closedPromise, storedError => {
+                if (!preventAbort) {
+                    shutdownWithAction(() => WritableStreamAbort(dest, storedError), true, storedError);
+                }
+                else {
+                    shutdown(true, storedError);
+                }
+            });
+            // Errors must be propagated backward
+            isOrBecomesErrored(dest, writer._closedPromise, storedError => {
+                if (!preventCancel) {
+                    shutdownWithAction(() => ReadableStreamCancel(source, storedError), true, storedError);
+                }
+                else {
+                    shutdown(true, storedError);
+                }
+            });
+            // Closing must be propagated forward
+            isOrBecomesClosed(source, reader._closedPromise, () => {
+                if (!preventClose) {
+                    shutdownWithAction(() => WritableStreamDefaultWriterCloseWithErrorPropagation(writer));
+                }
+                else {
+                    shutdown();
+                }
+            });
+            // Closing must be propagated backward
+            if (WritableStreamCloseQueuedOrInFlight(dest) || dest._state === 'closed') {
+                const destClosed = new TypeError('the destination writable stream closed before all data could be piped to it');
+                if (!preventCancel) {
+                    shutdownWithAction(() => ReadableStreamCancel(source, destClosed), true, destClosed);
+                }
+                else {
+                    shutdown(true, destClosed);
+                }
+            }
+            setPromiseIsHandledToTrue(pipeLoop());
+            function waitForWritesToFinish() {
+                // Another write may have started while we were waiting on this currentWrite, so we have to be sure to wait
+                // for that too.
+                const oldCurrentWrite = currentWrite;
+                return PerformPromiseThen(currentWrite, () => oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined);
+            }
+            function isOrBecomesErrored(stream, promise, action) {
+                if (stream._state === 'errored') {
+                    action(stream._storedError);
+                }
+                else {
+                    uponRejection(promise, action);
+                }
+            }
+            function isOrBecomesClosed(stream, promise, action) {
+                if (stream._state === 'closed') {
+                    action();
+                }
+                else {
+                    uponFulfillment(promise, action);
+                }
+            }
+            function shutdownWithAction(action, originalIsError, originalError) {
+                if (shuttingDown) {
+                    return;
+                }
+                shuttingDown = true;
+                if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {
+                    uponFulfillment(waitForWritesToFinish(), doTheRest);
+                }
+                else {
+                    doTheRest();
+                }
+                function doTheRest() {
+                    uponPromise(action(), () => finalize(originalIsError, originalError), newError => finalize(true, newError));
+                }
+            }
+            function shutdown(isError, error) {
+                if (shuttingDown) {
+                    return;
+                }
+                shuttingDown = true;
+                if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {
+                    uponFulfillment(waitForWritesToFinish(), () => finalize(isError, error));
+                }
+                else {
+                    finalize(isError, error);
+                }
+            }
+            function finalize(isError, error) {
+                WritableStreamDefaultWriterRelease(writer);
+                ReadableStreamReaderGenericRelease(reader);
+                if (signal !== undefined) {
+                    signal.removeEventListener('abort', abortAlgorithm);
+                }
+                if (isError) {
+                    reject(error);
+                }
+                else {
+                    resolve(undefined);
+                }
+            }
+        });
+    }
+
+    /**
+     * Allows control of a {@link ReadableStream | readable stream}'s state and internal queue.
+     *
+     * @public
+     */
+    class ReadableStreamDefaultController {
+        constructor() {
+            throw new TypeError('Illegal constructor');
+        }
+        /**
+         * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is
+         * over-full. An underlying source ought to use this information to determine when and how to apply backpressure.
+         */
+        get desiredSize() {
+            if (!IsReadableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$1('desiredSize');
+            }
+            return ReadableStreamDefaultControllerGetDesiredSize(this);
+        }
+        /**
+         * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from
+         * the stream, but once those are read, the stream will become closed.
+         */
+        close() {
+            if (!IsReadableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$1('close');
+            }
+            if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {
+                throw new TypeError('The stream is not in a state that permits close');
+            }
+            ReadableStreamDefaultControllerClose(this);
+        }
+        enqueue(chunk = undefined) {
+            if (!IsReadableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$1('enqueue');
+            }
+            if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {
+                throw new TypeError('The stream is not in a state that permits enqueue');
+            }
+            return ReadableStreamDefaultControllerEnqueue(this, chunk);
+        }
+        /**
+         * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.
+         */
+        error(e = undefined) {
+            if (!IsReadableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$1('error');
+            }
+            ReadableStreamDefaultControllerError(this, e);
+        }
+        /** @internal */
+        [CancelSteps](reason) {
+            ResetQueue(this);
+            const result = this._cancelAlgorithm(reason);
+            ReadableStreamDefaultControllerClearAlgorithms(this);
+            return result;
+        }
+        /** @internal */
+        [PullSteps](readRequest) {
+            const stream = this._controlledReadableStream;
+            if (this._queue.length > 0) {
+                const chunk = DequeueValue(this);
+                if (this._closeRequested && this._queue.length === 0) {
+                    ReadableStreamDefaultControllerClearAlgorithms(this);
+                    ReadableStreamClose(stream);
+                }
+                else {
+                    ReadableStreamDefaultControllerCallPullIfNeeded(this);
+                }
+                readRequest._chunkSteps(chunk);
+            }
+            else {
+                ReadableStreamAddReadRequest(stream, readRequest);
+                ReadableStreamDefaultControllerCallPullIfNeeded(this);
+            }
+        }
+    }
+    Object.defineProperties(ReadableStreamDefaultController.prototype, {
+        close: { enumerable: true },
+        enqueue: { enumerable: true },
+        error: { enumerable: true },
+        desiredSize: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableStreamDefaultController',
+            configurable: true
+        });
+    }
+    // Abstract operations for the ReadableStreamDefaultController.
+    function IsReadableStreamDefaultController(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableStream')) {
+            return false;
+        }
+        return x instanceof ReadableStreamDefaultController;
+    }
+    function ReadableStreamDefaultControllerCallPullIfNeeded(controller) {
+        const shouldPull = ReadableStreamDefaultControllerShouldCallPull(controller);
+        if (!shouldPull) {
+            return;
+        }
+        if (controller._pulling) {
+            controller._pullAgain = true;
+            return;
+        }
+        controller._pulling = true;
+        const pullPromise = controller._pullAlgorithm();
+        uponPromise(pullPromise, () => {
+            controller._pulling = false;
+            if (controller._pullAgain) {
+                controller._pullAgain = false;
+                ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+            }
+        }, e => {
+            ReadableStreamDefaultControllerError(controller, e);
+        });
+    }
+    function ReadableStreamDefaultControllerShouldCallPull(controller) {
+        const stream = controller._controlledReadableStream;
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+            return false;
+        }
+        if (!controller._started) {
+            return false;
+        }
+        if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+            return true;
+        }
+        const desiredSize = ReadableStreamDefaultControllerGetDesiredSize(controller);
+        if (desiredSize > 0) {
+            return true;
+        }
+        return false;
+    }
+    function ReadableStreamDefaultControllerClearAlgorithms(controller) {
+        controller._pullAlgorithm = undefined;
+        controller._cancelAlgorithm = undefined;
+        controller._strategySizeAlgorithm = undefined;
+    }
+    // A client of ReadableStreamDefaultController may use these functions directly to bypass state check.
+    function ReadableStreamDefaultControllerClose(controller) {
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+            return;
+        }
+        const stream = controller._controlledReadableStream;
+        controller._closeRequested = true;
+        if (controller._queue.length === 0) {
+            ReadableStreamDefaultControllerClearAlgorithms(controller);
+            ReadableStreamClose(stream);
+        }
+    }
+    function ReadableStreamDefaultControllerEnqueue(controller, chunk) {
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+            return;
+        }
+        const stream = controller._controlledReadableStream;
+        if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+            ReadableStreamFulfillReadRequest(stream, chunk, false);
+        }
+        else {
+            let chunkSize;
+            try {
+                chunkSize = controller._strategySizeAlgorithm(chunk);
+            }
+            catch (chunkSizeE) {
+                ReadableStreamDefaultControllerError(controller, chunkSizeE);
+                throw chunkSizeE;
+            }
+            try {
+                EnqueueValueWithSize(controller, chunk, chunkSize);
+            }
+            catch (enqueueE) {
+                ReadableStreamDefaultControllerError(controller, enqueueE);
+                throw enqueueE;
+            }
+        }
+        ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+    }
+    function ReadableStreamDefaultControllerError(controller, e) {
+        const stream = controller._controlledReadableStream;
+        if (stream._state !== 'readable') {
+            return;
+        }
+        ResetQueue(controller);
+        ReadableStreamDefaultControllerClearAlgorithms(controller);
+        ReadableStreamError(stream, e);
+    }
+    function ReadableStreamDefaultControllerGetDesiredSize(controller) {
+        const state = controller._controlledReadableStream._state;
+        if (state === 'errored') {
+            return null;
+        }
+        if (state === 'closed') {
+            return 0;
+        }
+        return controller._strategyHWM - controller._queueTotalSize;
+    }
+    // This is used in the implementation of TransformStream.
+    function ReadableStreamDefaultControllerHasBackpressure(controller) {
+        if (ReadableStreamDefaultControllerShouldCallPull(controller)) {
+            return false;
+        }
+        return true;
+    }
+    function ReadableStreamDefaultControllerCanCloseOrEnqueue(controller) {
+        const state = controller._controlledReadableStream._state;
+        if (!controller._closeRequested && state === 'readable') {
+            return true;
+        }
+        return false;
+    }
+    function SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm) {
+        controller._controlledReadableStream = stream;
+        controller._queue = undefined;
+        controller._queueTotalSize = undefined;
+        ResetQueue(controller);
+        controller._started = false;
+        controller._closeRequested = false;
+        controller._pullAgain = false;
+        controller._pulling = false;
+        controller._strategySizeAlgorithm = sizeAlgorithm;
+        controller._strategyHWM = highWaterMark;
+        controller._pullAlgorithm = pullAlgorithm;
+        controller._cancelAlgorithm = cancelAlgorithm;
+        stream._readableStreamController = controller;
+        const startResult = startAlgorithm();
+        uponPromise(promiseResolvedWith(startResult), () => {
+            controller._started = true;
+            ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+        }, r => {
+            ReadableStreamDefaultControllerError(controller, r);
+        });
+    }
+    function SetUpReadableStreamDefaultControllerFromUnderlyingSource(stream, underlyingSource, highWaterMark, sizeAlgorithm) {
+        const controller = Object.create(ReadableStreamDefaultController.prototype);
+        let startAlgorithm = () => undefined;
+        let pullAlgorithm = () => promiseResolvedWith(undefined);
+        let cancelAlgorithm = () => promiseResolvedWith(undefined);
+        if (underlyingSource.start !== undefined) {
+            startAlgorithm = () => underlyingSource.start(controller);
+        }
+        if (underlyingSource.pull !== undefined) {
+            pullAlgorithm = () => underlyingSource.pull(controller);
+        }
+        if (underlyingSource.cancel !== undefined) {
+            cancelAlgorithm = reason => underlyingSource.cancel(reason);
+        }
+        SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm);
+    }
+    // Helper functions for the ReadableStreamDefaultController.
+    function defaultControllerBrandCheckException$1(name) {
+        return new TypeError(`ReadableStreamDefaultController.prototype.${name} can only be used on a ReadableStreamDefaultController`);
+    }
+
+    function ReadableStreamTee(stream, cloneForBranch2) {
+        if (IsReadableByteStreamController(stream._readableStreamController)) {
+            return ReadableByteStreamTee(stream);
+        }
+        return ReadableStreamDefaultTee(stream);
+    }
+    function ReadableStreamDefaultTee(stream, cloneForBranch2) {
+        const reader = AcquireReadableStreamDefaultReader(stream);
+        let reading = false;
+        let readAgain = false;
+        let canceled1 = false;
+        let canceled2 = false;
+        let reason1;
+        let reason2;
+        let branch1;
+        let branch2;
+        let resolveCancelPromise;
+        const cancelPromise = newPromise(resolve => {
+            resolveCancelPromise = resolve;
+        });
+        function pullAlgorithm() {
+            if (reading) {
+                readAgain = true;
+                return promiseResolvedWith(undefined);
+            }
+            reading = true;
+            const readRequest = {
+                _chunkSteps: chunk => {
+                    // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                    // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                    // successful synchronously-available reads get ahead of asynchronously-available errors.
+                    queueMicrotask(() => {
+                        readAgain = false;
+                        const chunk1 = chunk;
+                        const chunk2 = chunk;
+                        // There is no way to access the cloning code right now in the reference implementation.
+                        // If we add one then we'll need an implementation for serializable objects.
+                        // if (!canceled2 && cloneForBranch2) {
+                        //   chunk2 = StructuredDeserialize(StructuredSerialize(chunk2));
+                        // }
+                        if (!canceled1) {
+                            ReadableStreamDefaultControllerEnqueue(branch1._readableStreamController, chunk1);
+                        }
+                        if (!canceled2) {
+                            ReadableStreamDefaultControllerEnqueue(branch2._readableStreamController, chunk2);
+                        }
+                        reading = false;
+                        if (readAgain) {
+                            pullAlgorithm();
+                        }
+                    });
+                },
+                _closeSteps: () => {
+                    reading = false;
+                    if (!canceled1) {
+                        ReadableStreamDefaultControllerClose(branch1._readableStreamController);
+                    }
+                    if (!canceled2) {
+                        ReadableStreamDefaultControllerClose(branch2._readableStreamController);
+                    }
+                    if (!canceled1 || !canceled2) {
+                        resolveCancelPromise(undefined);
+                    }
+                },
+                _errorSteps: () => {
+                    reading = false;
+                }
+            };
+            ReadableStreamDefaultReaderRead(reader, readRequest);
+            return promiseResolvedWith(undefined);
+        }
+        function cancel1Algorithm(reason) {
+            canceled1 = true;
+            reason1 = reason;
+            if (canceled2) {
+                const compositeReason = CreateArrayFromList([reason1, reason2]);
+                const cancelResult = ReadableStreamCancel(stream, compositeReason);
+                resolveCancelPromise(cancelResult);
+            }
+            return cancelPromise;
+        }
+        function cancel2Algorithm(reason) {
+            canceled2 = true;
+            reason2 = reason;
+            if (canceled1) {
+                const compositeReason = CreateArrayFromList([reason1, reason2]);
+                const cancelResult = ReadableStreamCancel(stream, compositeReason);
+                resolveCancelPromise(cancelResult);
+            }
+            return cancelPromise;
+        }
+        function startAlgorithm() {
+            // do nothing
+        }
+        branch1 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel1Algorithm);
+        branch2 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel2Algorithm);
+        uponRejection(reader._closedPromise, (r) => {
+            ReadableStreamDefaultControllerError(branch1._readableStreamController, r);
+            ReadableStreamDefaultControllerError(branch2._readableStreamController, r);
+            if (!canceled1 || !canceled2) {
+                resolveCancelPromise(undefined);
+            }
+        });
+        return [branch1, branch2];
+    }
+    function ReadableByteStreamTee(stream) {
+        let reader = AcquireReadableStreamDefaultReader(stream);
+        let reading = false;
+        let readAgainForBranch1 = false;
+        let readAgainForBranch2 = false;
+        let canceled1 = false;
+        let canceled2 = false;
+        let reason1;
+        let reason2;
+        let branch1;
+        let branch2;
+        let resolveCancelPromise;
+        const cancelPromise = newPromise(resolve => {
+            resolveCancelPromise = resolve;
+        });
+        function forwardReaderError(thisReader) {
+            uponRejection(thisReader._closedPromise, r => {
+                if (thisReader !== reader) {
+                    return;
+                }
+                ReadableByteStreamControllerError(branch1._readableStreamController, r);
+                ReadableByteStreamControllerError(branch2._readableStreamController, r);
+                if (!canceled1 || !canceled2) {
+                    resolveCancelPromise(undefined);
+                }
+            });
+        }
+        function pullWithDefaultReader() {
+            if (IsReadableStreamBYOBReader(reader)) {
+                ReadableStreamReaderGenericRelease(reader);
+                reader = AcquireReadableStreamDefaultReader(stream);
+                forwardReaderError(reader);
+            }
+            const readRequest = {
+                _chunkSteps: chunk => {
+                    // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                    // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                    // successful synchronously-available reads get ahead of asynchronously-available errors.
+                    queueMicrotask(() => {
+                        readAgainForBranch1 = false;
+                        readAgainForBranch2 = false;
+                        const chunk1 = chunk;
+                        let chunk2 = chunk;
+                        if (!canceled1 && !canceled2) {
+                            try {
+                                chunk2 = CloneAsUint8Array(chunk);
+                            }
+                            catch (cloneE) {
+                                ReadableByteStreamControllerError(branch1._readableStreamController, cloneE);
+                                ReadableByteStreamControllerError(branch2._readableStreamController, cloneE);
+                                resolveCancelPromise(ReadableStreamCancel(stream, cloneE));
+                                return;
+                            }
+                        }
+                        if (!canceled1) {
+                            ReadableByteStreamControllerEnqueue(branch1._readableStreamController, chunk1);
+                        }
+                        if (!canceled2) {
+                            ReadableByteStreamControllerEnqueue(branch2._readableStreamController, chunk2);
+                        }
+                        reading = false;
+                        if (readAgainForBranch1) {
+                            pull1Algorithm();
+                        }
+                        else if (readAgainForBranch2) {
+                            pull2Algorithm();
+                        }
+                    });
+                },
+                _closeSteps: () => {
+                    reading = false;
+                    if (!canceled1) {
+                        ReadableByteStreamControllerClose(branch1._readableStreamController);
+                    }
+                    if (!canceled2) {
+                        ReadableByteStreamControllerClose(branch2._readableStreamController);
+                    }
+                    if (branch1._readableStreamController._pendingPullIntos.length > 0) {
+                        ReadableByteStreamControllerRespond(branch1._readableStreamController, 0);
+                    }
+                    if (branch2._readableStreamController._pendingPullIntos.length > 0) {
+                        ReadableByteStreamControllerRespond(branch2._readableStreamController, 0);
+                    }
+                    if (!canceled1 || !canceled2) {
+                        resolveCancelPromise(undefined);
+                    }
+                },
+                _errorSteps: () => {
+                    reading = false;
+                }
+            };
+            ReadableStreamDefaultReaderRead(reader, readRequest);
+        }
+        function pullWithBYOBReader(view, forBranch2) {
+            if (IsReadableStreamDefaultReader(reader)) {
+                ReadableStreamReaderGenericRelease(reader);
+                reader = AcquireReadableStreamBYOBReader(stream);
+                forwardReaderError(reader);
+            }
+            const byobBranch = forBranch2 ? branch2 : branch1;
+            const otherBranch = forBranch2 ? branch1 : branch2;
+            const readIntoRequest = {
+                _chunkSteps: chunk => {
+                    // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                    // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                    // successful synchronously-available reads get ahead of asynchronously-available errors.
+                    queueMicrotask(() => {
+                        readAgainForBranch1 = false;
+                        readAgainForBranch2 = false;
+                        const byobCanceled = forBranch2 ? canceled2 : canceled1;
+                        const otherCanceled = forBranch2 ? canceled1 : canceled2;
+                        if (!otherCanceled) {
+                            let clonedChunk;
+                            try {
+                                clonedChunk = CloneAsUint8Array(chunk);
+                            }
+                            catch (cloneE) {
+                                ReadableByteStreamControllerError(byobBranch._readableStreamController, cloneE);
+                                ReadableByteStreamControllerError(otherBranch._readableStreamController, cloneE);
+                                resolveCancelPromise(ReadableStreamCancel(stream, cloneE));
+                                return;
+                            }
+                            if (!byobCanceled) {
+                                ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                            }
+                            ReadableByteStreamControllerEnqueue(otherBranch._readableStreamController, clonedChunk);
+                        }
+                        else if (!byobCanceled) {
+                            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                        }
+                        reading = false;
+                        if (readAgainForBranch1) {
+                            pull1Algorithm();
+                        }
+                        else if (readAgainForBranch2) {
+                            pull2Algorithm();
+                        }
+                    });
+                },
+                _closeSteps: chunk => {
+                    reading = false;
+                    const byobCanceled = forBranch2 ? canceled2 : canceled1;
+                    const otherCanceled = forBranch2 ? canceled1 : canceled2;
+                    if (!byobCanceled) {
+                        ReadableByteStreamControllerClose(byobBranch._readableStreamController);
+                    }
+                    if (!otherCanceled) {
+                        ReadableByteStreamControllerClose(otherBranch._readableStreamController);
+                    }
+                    if (chunk !== undefined) {
+                        if (!byobCanceled) {
+                            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                        }
+                        if (!otherCanceled && otherBranch._readableStreamController._pendingPullIntos.length > 0) {
+                            ReadableByteStreamControllerRespond(otherBranch._readableStreamController, 0);
+                        }
+                    }
+                    if (!byobCanceled || !otherCanceled) {
+                        resolveCancelPromise(undefined);
+                    }
+                },
+                _errorSteps: () => {
+                    reading = false;
+                }
+            };
+            ReadableStreamBYOBReaderRead(reader, view, readIntoRequest);
+        }
+        function pull1Algorithm() {
+            if (reading) {
+                readAgainForBranch1 = true;
+                return promiseResolvedWith(undefined);
+            }
+            reading = true;
+            const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch1._readableStreamController);
+            if (byobRequest === null) {
+                pullWithDefaultReader();
+            }
+            else {
+                pullWithBYOBReader(byobRequest._view, false);
+            }
+            return promiseResolvedWith(undefined);
+        }
+        function pull2Algorithm() {
+            if (reading) {
+                readAgainForBranch2 = true;
+                return promiseResolvedWith(undefined);
+            }
+            reading = true;
+            const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch2._readableStreamController);
+            if (byobRequest === null) {
+                pullWithDefaultReader();
+            }
+            else {
+                pullWithBYOBReader(byobRequest._view, true);
+            }
+            return promiseResolvedWith(undefined);
+        }
+        function cancel1Algorithm(reason) {
+            canceled1 = true;
+            reason1 = reason;
+            if (canceled2) {
+                const compositeReason = CreateArrayFromList([reason1, reason2]);
+                const cancelResult = ReadableStreamCancel(stream, compositeReason);
+                resolveCancelPromise(cancelResult);
+            }
+            return cancelPromise;
+        }
+        function cancel2Algorithm(reason) {
+            canceled2 = true;
+            reason2 = reason;
+            if (canceled1) {
+                const compositeReason = CreateArrayFromList([reason1, reason2]);
+                const cancelResult = ReadableStreamCancel(stream, compositeReason);
+                resolveCancelPromise(cancelResult);
+            }
+            return cancelPromise;
+        }
+        function startAlgorithm() {
+            return;
+        }
+        branch1 = CreateReadableByteStream(startAlgorithm, pull1Algorithm, cancel1Algorithm);
+        branch2 = CreateReadableByteStream(startAlgorithm, pull2Algorithm, cancel2Algorithm);
+        forwardReaderError(reader);
+        return [branch1, branch2];
+    }
+
+    function convertUnderlyingDefaultOrByteSource(source, context) {
+        assertDictionary(source, context);
+        const original = source;
+        const autoAllocateChunkSize = original === null || original === void 0 ? void 0 : original.autoAllocateChunkSize;
+        const cancel = original === null || original === void 0 ? void 0 : original.cancel;
+        const pull = original === null || original === void 0 ? void 0 : original.pull;
+        const start = original === null || original === void 0 ? void 0 : original.start;
+        const type = original === null || original === void 0 ? void 0 : original.type;
+        return {
+            autoAllocateChunkSize: autoAllocateChunkSize === undefined ?
+                undefined :
+                convertUnsignedLongLongWithEnforceRange(autoAllocateChunkSize, `${context} has member 'autoAllocateChunkSize' that`),
+            cancel: cancel === undefined ?
+                undefined :
+                convertUnderlyingSourceCancelCallback(cancel, original, `${context} has member 'cancel' that`),
+            pull: pull === undefined ?
+                undefined :
+                convertUnderlyingSourcePullCallback(pull, original, `${context} has member 'pull' that`),
+            start: start === undefined ?
+                undefined :
+                convertUnderlyingSourceStartCallback(start, original, `${context} has member 'start' that`),
+            type: type === undefined ? undefined : convertReadableStreamType(type, `${context} has member 'type' that`)
+        };
+    }
+    function convertUnderlyingSourceCancelCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (reason) => promiseCall(fn, original, [reason]);
+    }
+    function convertUnderlyingSourcePullCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (controller) => promiseCall(fn, original, [controller]);
+    }
+    function convertUnderlyingSourceStartCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (controller) => reflectCall(fn, original, [controller]);
+    }
+    function convertReadableStreamType(type, context) {
+        type = `${type}`;
+        if (type !== 'bytes') {
+            throw new TypeError(`${context} '${type}' is not a valid enumeration value for ReadableStreamType`);
+        }
+        return type;
+    }
+
+    function convertReaderOptions(options, context) {
+        assertDictionary(options, context);
+        const mode = options === null || options === void 0 ? void 0 : options.mode;
+        return {
+            mode: mode === undefined ? undefined : convertReadableStreamReaderMode(mode, `${context} has member 'mode' that`)
+        };
+    }
+    function convertReadableStreamReaderMode(mode, context) {
+        mode = `${mode}`;
+        if (mode !== 'byob') {
+            throw new TypeError(`${context} '${mode}' is not a valid enumeration value for ReadableStreamReaderMode`);
+        }
+        return mode;
+    }
+
+    function convertIteratorOptions(options, context) {
+        assertDictionary(options, context);
+        const preventCancel = options === null || options === void 0 ? void 0 : options.preventCancel;
+        return { preventCancel: Boolean(preventCancel) };
+    }
+
+    function convertPipeOptions(options, context) {
+        assertDictionary(options, context);
+        const preventAbort = options === null || options === void 0 ? void 0 : options.preventAbort;
+        const preventCancel = options === null || options === void 0 ? void 0 : options.preventCancel;
+        const preventClose = options === null || options === void 0 ? void 0 : options.preventClose;
+        const signal = options === null || options === void 0 ? void 0 : options.signal;
+        if (signal !== undefined) {
+            assertAbortSignal(signal, `${context} has member 'signal' that`);
+        }
+        return {
+            preventAbort: Boolean(preventAbort),
+            preventCancel: Boolean(preventCancel),
+            preventClose: Boolean(preventClose),
+            signal
+        };
+    }
+    function assertAbortSignal(signal, context) {
+        if (!isAbortSignal(signal)) {
+            throw new TypeError(`${context} is not an AbortSignal.`);
+        }
+    }
+
+    function convertReadableWritablePair(pair, context) {
+        assertDictionary(pair, context);
+        const readable = pair === null || pair === void 0 ? void 0 : pair.readable;
+        assertRequiredField(readable, 'readable', 'ReadableWritablePair');
+        assertReadableStream(readable, `${context} has member 'readable' that`);
+        const writable = pair === null || pair === void 0 ? void 0 : pair.writable;
+        assertRequiredField(writable, 'writable', 'ReadableWritablePair');
+        assertWritableStream(writable, `${context} has member 'writable' that`);
+        return { readable, writable };
+    }
+
+    /**
+     * A readable stream represents a source of data, from which you can read.
+     *
+     * @public
+     */
+    class ReadableStream {
+        constructor(rawUnderlyingSource = {}, rawStrategy = {}) {
+            if (rawUnderlyingSource === undefined) {
+                rawUnderlyingSource = null;
+            }
+            else {
+                assertObject(rawUnderlyingSource, 'First parameter');
+            }
+            const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');
+            const underlyingSource = convertUnderlyingDefaultOrByteSource(rawUnderlyingSource, 'First parameter');
+            InitializeReadableStream(this);
+            if (underlyingSource.type === 'bytes') {
+                if (strategy.size !== undefined) {
+                    throw new RangeError('The strategy for a byte stream cannot have a size function');
+                }
+                const highWaterMark = ExtractHighWaterMark(strategy, 0);
+                SetUpReadableByteStreamControllerFromUnderlyingSource(this, underlyingSource, highWaterMark);
+            }
+            else {
+                const sizeAlgorithm = ExtractSizeAlgorithm(strategy);
+                const highWaterMark = ExtractHighWaterMark(strategy, 1);
+                SetUpReadableStreamDefaultControllerFromUnderlyingSource(this, underlyingSource, highWaterMark, sizeAlgorithm);
+            }
+        }
+        /**
+         * Whether or not the readable stream is locked to a {@link ReadableStreamDefaultReader | reader}.
+         */
+        get locked() {
+            if (!IsReadableStream(this)) {
+                throw streamBrandCheckException$1('locked');
+            }
+            return IsReadableStreamLocked(this);
+        }
+        /**
+         * Cancels the stream, signaling a loss of interest in the stream by a consumer.
+         *
+         * The supplied `reason` argument will be given to the underlying source's {@link UnderlyingSource.cancel | cancel()}
+         * method, which might or might not use it.
+         */
+        cancel(reason = undefined) {
+            if (!IsReadableStream(this)) {
+                return promiseRejectedWith(streamBrandCheckException$1('cancel'));
+            }
+            if (IsReadableStreamLocked(this)) {
+                return promiseRejectedWith(new TypeError('Cannot cancel a stream that already has a reader'));
+            }
+            return ReadableStreamCancel(this, reason);
+        }
+        getReader(rawOptions = undefined) {
+            if (!IsReadableStream(this)) {
+                throw streamBrandCheckException$1('getReader');
+            }
+            const options = convertReaderOptions(rawOptions, 'First parameter');
+            if (options.mode === undefined) {
+                return AcquireReadableStreamDefaultReader(this);
+            }
+            return AcquireReadableStreamBYOBReader(this);
+        }
+        pipeThrough(rawTransform, rawOptions = {}) {
+            if (!IsReadableStream(this)) {
+                throw streamBrandCheckException$1('pipeThrough');
+            }
+            assertRequiredArgument(rawTransform, 1, 'pipeThrough');
+            const transform = convertReadableWritablePair(rawTransform, 'First parameter');
+            const options = convertPipeOptions(rawOptions, 'Second parameter');
+            if (IsReadableStreamLocked(this)) {
+                throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked ReadableStream');
+            }
+            if (IsWritableStreamLocked(transform.writable)) {
+                throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked WritableStream');
+            }
+            const promise = ReadableStreamPipeTo(this, transform.writable, options.preventClose, options.preventAbort, options.preventCancel, options.signal);
+            setPromiseIsHandledToTrue(promise);
+            return transform.readable;
+        }
+        pipeTo(destination, rawOptions = {}) {
+            if (!IsReadableStream(this)) {
+                return promiseRejectedWith(streamBrandCheckException$1('pipeTo'));
+            }
+            if (destination === undefined) {
+                return promiseRejectedWith(`Parameter 1 is required in 'pipeTo'.`);
+            }
+            if (!IsWritableStream(destination)) {
+                return promiseRejectedWith(new TypeError(`ReadableStream.prototype.pipeTo's first argument must be a WritableStream`));
+            }
+            let options;
+            try {
+                options = convertPipeOptions(rawOptions, 'Second parameter');
+            }
+            catch (e) {
+                return promiseRejectedWith(e);
+            }
+            if (IsReadableStreamLocked(this)) {
+                return promiseRejectedWith(new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream'));
+            }
+            if (IsWritableStreamLocked(destination)) {
+                return promiseRejectedWith(new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream'));
+            }
+            return ReadableStreamPipeTo(this, destination, options.preventClose, options.preventAbort, options.preventCancel, options.signal);
+        }
+        /**
+         * Tees this readable stream, returning a two-element array containing the two resulting branches as
+         * new {@link ReadableStream} instances.
+         *
+         * Teeing a stream will lock it, preventing any other consumer from acquiring a reader.
+         * To cancel the stream, cancel both of the resulting branches; a composite cancellation reason will then be
+         * propagated to the stream's underlying source.
+         *
+         * Note that the chunks seen in each branch will be the same object. If the chunks are not immutable,
+         * this could allow interference between the two branches.
+         */
+        tee() {
+            if (!IsReadableStream(this)) {
+                throw streamBrandCheckException$1('tee');
+            }
+            const branches = ReadableStreamTee(this);
+            return CreateArrayFromList(branches);
+        }
+        values(rawOptions = undefined) {
+            if (!IsReadableStream(this)) {
+                throw streamBrandCheckException$1('values');
+            }
+            const options = convertIteratorOptions(rawOptions, 'First parameter');
+            return AcquireReadableStreamAsyncIterator(this, options.preventCancel);
+        }
+    }
+    Object.defineProperties(ReadableStream.prototype, {
+        cancel: { enumerable: true },
+        getReader: { enumerable: true },
+        pipeThrough: { enumerable: true },
+        pipeTo: { enumerable: true },
+        tee: { enumerable: true },
+        values: { enumerable: true },
+        locked: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableStream.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableStream',
+            configurable: true
+        });
+    }
+    if (typeof SymbolPolyfill.asyncIterator === 'symbol') {
+        Object.defineProperty(ReadableStream.prototype, SymbolPolyfill.asyncIterator, {
+            value: ReadableStream.prototype.values,
+            writable: true,
+            configurable: true
+        });
+    }
+    // Abstract operations for the ReadableStream.
+    // Throws if and only if startAlgorithm throws.
+    function CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark = 1, sizeAlgorithm = () => 1) {
+        const stream = Object.create(ReadableStream.prototype);
+        InitializeReadableStream(stream);
+        const controller = Object.create(ReadableStreamDefaultController.prototype);
+        SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm);
+        return stream;
+    }
+    // Throws if and only if startAlgorithm throws.
+    function CreateReadableByteStream(startAlgorithm, pullAlgorithm, cancelAlgorithm) {
+        const stream = Object.create(ReadableStream.prototype);
+        InitializeReadableStream(stream);
+        const controller = Object.create(ReadableByteStreamController.prototype);
+        SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, 0, undefined);
+        return stream;
+    }
+    function InitializeReadableStream(stream) {
+        stream._state = 'readable';
+        stream._reader = undefined;
+        stream._storedError = undefined;
+        stream._disturbed = false;
+    }
+    function IsReadableStream(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_readableStreamController')) {
+            return false;
+        }
+        return x instanceof ReadableStream;
+    }
+    function IsReadableStreamLocked(stream) {
+        if (stream._reader === undefined) {
+            return false;
+        }
+        return true;
+    }
+    // ReadableStream API exposed for controllers.
+    function ReadableStreamCancel(stream, reason) {
+        stream._disturbed = true;
+        if (stream._state === 'closed') {
+            return promiseResolvedWith(undefined);
+        }
+        if (stream._state === 'errored') {
+            return promiseRejectedWith(stream._storedError);
+        }
+        ReadableStreamClose(stream);
+        const reader = stream._reader;
+        if (reader !== undefined && IsReadableStreamBYOBReader(reader)) {
+            reader._readIntoRequests.forEach(readIntoRequest => {
+                readIntoRequest._closeSteps(undefined);
+            });
+            reader._readIntoRequests = new SimpleQueue();
+        }
+        const sourceCancelPromise = stream._readableStreamController[CancelSteps](reason);
+        return transformPromiseWith(sourceCancelPromise, noop);
+    }
+    function ReadableStreamClose(stream) {
+        stream._state = 'closed';
+        const reader = stream._reader;
+        if (reader === undefined) {
+            return;
+        }
+        defaultReaderClosedPromiseResolve(reader);
+        if (IsReadableStreamDefaultReader(reader)) {
+            reader._readRequests.forEach(readRequest => {
+                readRequest._closeSteps();
+            });
+            reader._readRequests = new SimpleQueue();
+        }
+    }
+    function ReadableStreamError(stream, e) {
+        stream._state = 'errored';
+        stream._storedError = e;
+        const reader = stream._reader;
+        if (reader === undefined) {
+            return;
+        }
+        defaultReaderClosedPromiseReject(reader, e);
+        if (IsReadableStreamDefaultReader(reader)) {
+            reader._readRequests.forEach(readRequest => {
+                readRequest._errorSteps(e);
+            });
+            reader._readRequests = new SimpleQueue();
+        }
+        else {
+            reader._readIntoRequests.forEach(readIntoRequest => {
+                readIntoRequest._errorSteps(e);
+            });
+            reader._readIntoRequests = new SimpleQueue();
+        }
+    }
+    // Helper functions for the ReadableStream.
+    function streamBrandCheckException$1(name) {
+        return new TypeError(`ReadableStream.prototype.${name} can only be used on a ReadableStream`);
+    }
+
+    function convertQueuingStrategyInit(init, context) {
+        assertDictionary(init, context);
+        const highWaterMark = init === null || init === void 0 ? void 0 : init.highWaterMark;
+        assertRequiredField(highWaterMark, 'highWaterMark', 'QueuingStrategyInit');
+        return {
+            highWaterMark: convertUnrestrictedDouble(highWaterMark)
+        };
+    }
+
+    // The size function must not have a prototype property nor be a constructor
+    const byteLengthSizeFunction = (chunk) => {
+        return chunk.byteLength;
+    };
+    try {
+        Object.defineProperty(byteLengthSizeFunction, 'name', {
+            value: 'size',
+            configurable: true
+        });
+    }
+    catch (_a) {
+        // This property is non-configurable in older browsers, so ignore if this throws.
+        // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility
+    }
+    /**
+     * A queuing strategy that counts the number of bytes in each chunk.
+     *
+     * @public
+     */
+    class ByteLengthQueuingStrategy {
+        constructor(options) {
+            assertRequiredArgument(options, 1, 'ByteLengthQueuingStrategy');
+            options = convertQueuingStrategyInit(options, 'First parameter');
+            this._byteLengthQueuingStrategyHighWaterMark = options.highWaterMark;
+        }
+        /**
+         * Returns the high water mark provided to the constructor.
+         */
+        get highWaterMark() {
+            if (!IsByteLengthQueuingStrategy(this)) {
+                throw byteLengthBrandCheckException('highWaterMark');
+            }
+            return this._byteLengthQueuingStrategyHighWaterMark;
+        }
+        /**
+         * Measures the size of `chunk` by returning the value of its `byteLength` property.
+         */
+        get size() {
+            if (!IsByteLengthQueuingStrategy(this)) {
+                throw byteLengthBrandCheckException('size');
+            }
+            return byteLengthSizeFunction;
+        }
+    }
+    Object.defineProperties(ByteLengthQueuingStrategy.prototype, {
+        highWaterMark: { enumerable: true },
+        size: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ByteLengthQueuingStrategy.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ByteLengthQueuingStrategy',
+            configurable: true
+        });
+    }
+    // Helper functions for the ByteLengthQueuingStrategy.
+    function byteLengthBrandCheckException(name) {
+        return new TypeError(`ByteLengthQueuingStrategy.prototype.${name} can only be used on a ByteLengthQueuingStrategy`);
+    }
+    function IsByteLengthQueuingStrategy(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_byteLengthQueuingStrategyHighWaterMark')) {
+            return false;
+        }
+        return x instanceof ByteLengthQueuingStrategy;
+    }
+
+    // The size function must not have a prototype property nor be a constructor
+    const countSizeFunction = () => {
+        return 1;
+    };
+    try {
+        Object.defineProperty(countSizeFunction, 'name', {
+            value: 'size',
+            configurable: true
+        });
+    }
+    catch (_a) {
+        // This property is non-configurable in older browsers, so ignore if this throws.
+        // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility
+    }
+    /**
+     * A queuing strategy that counts the number of chunks.
+     *
+     * @public
+     */
+    class CountQueuingStrategy {
+        constructor(options) {
+            assertRequiredArgument(options, 1, 'CountQueuingStrategy');
+            options = convertQueuingStrategyInit(options, 'First parameter');
+            this._countQueuingStrategyHighWaterMark = options.highWaterMark;
+        }
+        /**
+         * Returns the high water mark provided to the constructor.
+         */
+        get highWaterMark() {
+            if (!IsCountQueuingStrategy(this)) {
+                throw countBrandCheckException('highWaterMark');
+            }
+            return this._countQueuingStrategyHighWaterMark;
+        }
+        /**
+         * Measures the size of `chunk` by always returning 1.
+         * This ensures that the total queue size is a count of the number of chunks in the queue.
+         */
+        get size() {
+            if (!IsCountQueuingStrategy(this)) {
+                throw countBrandCheckException('size');
+            }
+            return countSizeFunction;
+        }
+    }
+    Object.defineProperties(CountQueuingStrategy.prototype, {
+        highWaterMark: { enumerable: true },
+        size: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(CountQueuingStrategy.prototype, SymbolPolyfill.toStringTag, {
+            value: 'CountQueuingStrategy',
+            configurable: true
+        });
+    }
+    // Helper functions for the CountQueuingStrategy.
+    function countBrandCheckException(name) {
+        return new TypeError(`CountQueuingStrategy.prototype.${name} can only be used on a CountQueuingStrategy`);
+    }
+    function IsCountQueuingStrategy(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_countQueuingStrategyHighWaterMark')) {
+            return false;
+        }
+        return x instanceof CountQueuingStrategy;
+    }
+
+    function convertTransformer(original, context) {
+        assertDictionary(original, context);
+        const flush = original === null || original === void 0 ? void 0 : original.flush;
+        const readableType = original === null || original === void 0 ? void 0 : original.readableType;
+        const start = original === null || original === void 0 ? void 0 : original.start;
+        const transform = original === null || original === void 0 ? void 0 : original.transform;
+        const writableType = original === null || original === void 0 ? void 0 : original.writableType;
+        return {
+            flush: flush === undefined ?
+                undefined :
+                convertTransformerFlushCallback(flush, original, `${context} has member 'flush' that`),
+            readableType,
+            start: start === undefined ?
+                undefined :
+                convertTransformerStartCallback(start, original, `${context} has member 'start' that`),
+            transform: transform === undefined ?
+                undefined :
+                convertTransformerTransformCallback(transform, original, `${context} has member 'transform' that`),
+            writableType
+        };
+    }
+    function convertTransformerFlushCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (controller) => promiseCall(fn, original, [controller]);
+    }
+    function convertTransformerStartCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (controller) => reflectCall(fn, original, [controller]);
+    }
+    function convertTransformerTransformCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (chunk, controller) => promiseCall(fn, original, [chunk, controller]);
+    }
+
+    // Class TransformStream
+    /**
+     * A transform stream consists of a pair of streams: a {@link WritableStream | writable stream},
+     * known as its writable side, and a {@link ReadableStream | readable stream}, known as its readable side.
+     * In a manner specific to the transform stream in question, writes to the writable side result in new data being
+     * made available for reading from the readable side.
+     *
+     * @public
+     */
+    class TransformStream {
+        constructor(rawTransformer = {}, rawWritableStrategy = {}, rawReadableStrategy = {}) {
+            if (rawTransformer === undefined) {
+                rawTransformer = null;
+            }
+            const writableStrategy = convertQueuingStrategy(rawWritableStrategy, 'Second parameter');
+            const readableStrategy = convertQueuingStrategy(rawReadableStrategy, 'Third parameter');
+            const transformer = convertTransformer(rawTransformer, 'First parameter');
+            if (transformer.readableType !== undefined) {
+                throw new RangeError('Invalid readableType specified');
+            }
+            if (transformer.writableType !== undefined) {
+                throw new RangeError('Invalid writableType specified');
+            }
+            const readableHighWaterMark = ExtractHighWaterMark(readableStrategy, 0);
+            const readableSizeAlgorithm = ExtractSizeAlgorithm(readableStrategy);
+            const writableHighWaterMark = ExtractHighWaterMark(writableStrategy, 1);
+            const writableSizeAlgorithm = ExtractSizeAlgorithm(writableStrategy);
+            let startPromise_resolve;
+            const startPromise = newPromise(resolve => {
+                startPromise_resolve = resolve;
+            });
+            InitializeTransformStream(this, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm);
+            SetUpTransformStreamDefaultControllerFromTransformer(this, transformer);
+            if (transformer.start !== undefined) {
+                startPromise_resolve(transformer.start(this._transformStreamController));
+            }
+            else {
+                startPromise_resolve(undefined);
+            }
+        }
+        /**
+         * The readable side of the transform stream.
+         */
+        get readable() {
+            if (!IsTransformStream(this)) {
+                throw streamBrandCheckException('readable');
+            }
+            return this._readable;
+        }
+        /**
+         * The writable side of the transform stream.
+         */
+        get writable() {
+            if (!IsTransformStream(this)) {
+                throw streamBrandCheckException('writable');
+            }
+            return this._writable;
+        }
+    }
+    Object.defineProperties(TransformStream.prototype, {
+        readable: { enumerable: true },
+        writable: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(TransformStream.prototype, SymbolPolyfill.toStringTag, {
+            value: 'TransformStream',
+            configurable: true
+        });
+    }
+    function InitializeTransformStream(stream, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm) {
+        function startAlgorithm() {
+            return startPromise;
+        }
+        function writeAlgorithm(chunk) {
+            return TransformStreamDefaultSinkWriteAlgorithm(stream, chunk);
+        }
+        function abortAlgorithm(reason) {
+            return TransformStreamDefaultSinkAbortAlgorithm(stream, reason);
+        }
+        function closeAlgorithm() {
+            return TransformStreamDefaultSinkCloseAlgorithm(stream);
+        }
+        stream._writable = CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, writableHighWaterMark, writableSizeAlgorithm);
+        function pullAlgorithm() {
+            return TransformStreamDefaultSourcePullAlgorithm(stream);
+        }
+        function cancelAlgorithm(reason) {
+            TransformStreamErrorWritableAndUnblockWrite(stream, reason);
+            return promiseResolvedWith(undefined);
+        }
+        stream._readable = CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, readableHighWaterMark, readableSizeAlgorithm);
+        // The [[backpressure]] slot is set to undefined so that it can be initialised by TransformStreamSetBackpressure.
+        stream._backpressure = undefined;
+        stream._backpressureChangePromise = undefined;
+        stream._backpressureChangePromise_resolve = undefined;
+        TransformStreamSetBackpressure(stream, true);
+        stream._transformStreamController = undefined;
+    }
+    function IsTransformStream(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_transformStreamController')) {
+            return false;
+        }
+        return x instanceof TransformStream;
+    }
+    // This is a no-op if both sides are already errored.
+    function TransformStreamError(stream, e) {
+        ReadableStreamDefaultControllerError(stream._readable._readableStreamController, e);
+        TransformStreamErrorWritableAndUnblockWrite(stream, e);
+    }
+    function TransformStreamErrorWritableAndUnblockWrite(stream, e) {
+        TransformStreamDefaultControllerClearAlgorithms(stream._transformStreamController);
+        WritableStreamDefaultControllerErrorIfNeeded(stream._writable._writableStreamController, e);
+        if (stream._backpressure) {
+            // Pretend that pull() was called to permit any pending write() calls to complete. TransformStreamSetBackpressure()
+            // cannot be called from enqueue() or pull() once the ReadableStream is errored, so this will will be the final time
+            // _backpressure is set.
+            TransformStreamSetBackpressure(stream, false);
+        }
+    }
+    function TransformStreamSetBackpressure(stream, backpressure) {
+        // Passes also when called during construction.
+        if (stream._backpressureChangePromise !== undefined) {
+            stream._backpressureChangePromise_resolve();
+        }
+        stream._backpressureChangePromise = newPromise(resolve => {
+            stream._backpressureChangePromise_resolve = resolve;
+        });
+        stream._backpressure = backpressure;
+    }
+    // Class TransformStreamDefaultController
+    /**
+     * Allows control of the {@link ReadableStream} and {@link WritableStream} of the associated {@link TransformStream}.
+     *
+     * @public
+     */
+    class TransformStreamDefaultController {
+        constructor() {
+            throw new TypeError('Illegal constructor');
+        }
+        /**
+         * Returns the desired size to fill the readable side’s internal queue. It can be negative, if the queue is over-full.
+         */
+        get desiredSize() {
+            if (!IsTransformStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException('desiredSize');
+            }
+            const readableController = this._controlledTransformStream._readable._readableStreamController;
+            return ReadableStreamDefaultControllerGetDesiredSize(readableController);
+        }
+        enqueue(chunk = undefined) {
+            if (!IsTransformStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException('enqueue');
+            }
+            TransformStreamDefaultControllerEnqueue(this, chunk);
+        }
+        /**
+         * Errors both the readable side and the writable side of the controlled transform stream, making all future
+         * interactions with it fail with the given error `e`. Any chunks queued for transformation will be discarded.
+         */
+        error(reason = undefined) {
+            if (!IsTransformStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException('error');
+            }
+            TransformStreamDefaultControllerError(this, reason);
+        }
+        /**
+         * Closes the readable side and errors the writable side of the controlled transform stream. This is useful when the
+         * transformer only needs to consume a portion of the chunks written to the writable side.
+         */
+        terminate() {
+            if (!IsTransformStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException('terminate');
+            }
+            TransformStreamDefaultControllerTerminate(this);
+        }
+    }
+    Object.defineProperties(TransformStreamDefaultController.prototype, {
+        enqueue: { enumerable: true },
+        error: { enumerable: true },
+        terminate: { enumerable: true },
+        desiredSize: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(TransformStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+            value: 'TransformStreamDefaultController',
+            configurable: true
+        });
+    }
+    // Transform Stream Default Controller Abstract Operations
+    function IsTransformStreamDefaultController(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_controlledTransformStream')) {
+            return false;
+        }
+        return x instanceof TransformStreamDefaultController;
+    }
+    function SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm) {
+        controller._controlledTransformStream = stream;
+        stream._transformStreamController = controller;
+        controller._transformAlgorithm = transformAlgorithm;
+        controller._flushAlgorithm = flushAlgorithm;
+    }
+    function SetUpTransformStreamDefaultControllerFromTransformer(stream, transformer) {
+        const controller = Object.create(TransformStreamDefaultController.prototype);
+        let transformAlgorithm = (chunk) => {
+            try {
+                TransformStreamDefaultControllerEnqueue(controller, chunk);
+                return promiseResolvedWith(undefined);
+            }
+            catch (transformResultE) {
+                return promiseRejectedWith(transformResultE);
+            }
+        };
+        let flushAlgorithm = () => promiseResolvedWith(undefined);
+        if (transformer.transform !== undefined) {
+            transformAlgorithm = chunk => transformer.transform(chunk, controller);
+        }
+        if (transformer.flush !== undefined) {
+            flushAlgorithm = () => transformer.flush(controller);
+        }
+        SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);
+    }
+    function TransformStreamDefaultControllerClearAlgorithms(controller) {
+        controller._transformAlgorithm = undefined;
+        controller._flushAlgorithm = undefined;
+    }
+    function TransformStreamDefaultControllerEnqueue(controller, chunk) {
+        const stream = controller._controlledTransformStream;
+        const readableController = stream._readable._readableStreamController;
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(readableController)) {
+            throw new TypeError('Readable side is not in a state that permits enqueue');
+        }
+        // We throttle transform invocations based on the backpressure of the ReadableStream, but we still
+        // accept TransformStreamDefaultControllerEnqueue() calls.
+        try {
+            ReadableStreamDefaultControllerEnqueue(readableController, chunk);
+        }
+        catch (e) {
+            // This happens when readableStrategy.size() throws.
+            TransformStreamErrorWritableAndUnblockWrite(stream, e);
+            throw stream._readable._storedError;
+        }
+        const backpressure = ReadableStreamDefaultControllerHasBackpressure(readableController);
+        if (backpressure !== stream._backpressure) {
+            TransformStreamSetBackpressure(stream, true);
+        }
+    }
+    function TransformStreamDefaultControllerError(controller, e) {
+        TransformStreamError(controller._controlledTransformStream, e);
+    }
+    function TransformStreamDefaultControllerPerformTransform(controller, chunk) {
+        const transformPromise = controller._transformAlgorithm(chunk);
+        return transformPromiseWith(transformPromise, undefined, r => {
+            TransformStreamError(controller._controlledTransformStream, r);
+            throw r;
+        });
+    }
+    function TransformStreamDefaultControllerTerminate(controller) {
+        const stream = controller._controlledTransformStream;
+        const readableController = stream._readable._readableStreamController;
+        ReadableStreamDefaultControllerClose(readableController);
+        const error = new TypeError('TransformStream terminated');
+        TransformStreamErrorWritableAndUnblockWrite(stream, error);
+    }
+    // TransformStreamDefaultSink Algorithms
+    function TransformStreamDefaultSinkWriteAlgorithm(stream, chunk) {
+        const controller = stream._transformStreamController;
+        if (stream._backpressure) {
+            const backpressureChangePromise = stream._backpressureChangePromise;
+            return transformPromiseWith(backpressureChangePromise, () => {
+                const writable = stream._writable;
+                const state = writable._state;
+                if (state === 'erroring') {
+                    throw writable._storedError;
+                }
+                return TransformStreamDefaultControllerPerformTransform(controller, chunk);
+            });
+        }
+        return TransformStreamDefaultControllerPerformTransform(controller, chunk);
+    }
+    function TransformStreamDefaultSinkAbortAlgorithm(stream, reason) {
+        // abort() is not called synchronously, so it is possible for abort() to be called when the stream is already
+        // errored.
+        TransformStreamError(stream, reason);
+        return promiseResolvedWith(undefined);
+    }
+    function TransformStreamDefaultSinkCloseAlgorithm(stream) {
+        // stream._readable cannot change after construction, so caching it across a call to user code is safe.
+        const readable = stream._readable;
+        const controller = stream._transformStreamController;
+        const flushPromise = controller._flushAlgorithm();
+        TransformStreamDefaultControllerClearAlgorithms(controller);
+        // Return a promise that is fulfilled with undefined on success.
+        return transformPromiseWith(flushPromise, () => {
+            if (readable._state === 'errored') {
+                throw readable._storedError;
+            }
+            ReadableStreamDefaultControllerClose(readable._readableStreamController);
+        }, r => {
+            TransformStreamError(stream, r);
+            throw readable._storedError;
+        });
+    }
+    // TransformStreamDefaultSource Algorithms
+    function TransformStreamDefaultSourcePullAlgorithm(stream) {
+        // Invariant. Enforced by the promises returned by start() and pull().
+        TransformStreamSetBackpressure(stream, false);
+        // Prevent the next pull() call until there is backpressure.
+        return stream._backpressureChangePromise;
+    }
+    // Helper functions for the TransformStreamDefaultController.
+    function defaultControllerBrandCheckException(name) {
+        return new TypeError(`TransformStreamDefaultController.prototype.${name} can only be used on a TransformStreamDefaultController`);
+    }
+    // Helper functions for the TransformStream.
+    function streamBrandCheckException(name) {
+        return new TypeError(`TransformStream.prototype.${name} can only be used on a TransformStream`);
+    }
+
+    const exports$1 = {
+        ReadableStream,
+        ReadableStreamDefaultController,
+        ReadableByteStreamController,
+        ReadableStreamBYOBRequest,
+        ReadableStreamDefaultReader,
+        ReadableStreamBYOBReader,
+        WritableStream,
+        WritableStreamDefaultController,
+        WritableStreamDefaultWriter,
+        ByteLengthQueuingStrategy,
+        CountQueuingStrategy,
+        TransformStream,
+        TransformStreamDefaultController
+    };
+    // Add classes to global scope
+    if (typeof globals !== 'undefined') {
+        for (const prop in exports$1) {
+            if (Object.prototype.hasOwnProperty.call(exports$1, prop)) {
+                Object.defineProperty(globals, prop, {
+                    value: exports$1[prop],
+                    writable: true,
+                    configurable: true
+                });
+            }
+        }
+    }
+
+    exports.ByteLengthQueuingStrategy = ByteLengthQueuingStrategy;
+    exports.CountQueuingStrategy = CountQueuingStrategy;
+    exports.ReadableByteStreamController = ReadableByteStreamController;
+    exports.ReadableStream = ReadableStream;
+    exports.ReadableStreamBYOBReader = ReadableStreamBYOBReader;
+    exports.ReadableStreamBYOBRequest = ReadableStreamBYOBRequest;
+    exports.ReadableStreamDefaultController = ReadableStreamDefaultController;
+    exports.ReadableStreamDefaultReader = ReadableStreamDefaultReader;
+    exports.TransformStream = TransformStream;
+    exports.TransformStreamDefaultController = TransformStreamDefaultController;
+    exports.WritableStream = WritableStream;
+    exports.WritableStreamDefaultController = WritableStreamDefaultController;
+    exports.WritableStreamDefaultWriter = WritableStreamDefaultWriter;
+
+    Object.defineProperty(exports, '__esModule', { value: true });
+
+})));
+//# sourceMappingURL=polyfill.es2018.js.map
diff --git a/node_modules/web-streams-polyfill/dist/polyfill.es2018.js.map b/node_modules/web-streams-polyfill/dist/polyfill.es2018.js.map
new file mode 100644
index 0000000..1f9d92a
--- /dev/null
+++ b/node_modules/web-streams-polyfill/dist/polyfill.es2018.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"polyfill.es2018.js","sources":["../src/stub/symbol.ts","../src/utils.ts","../src/lib/helpers/miscellaneous.ts","../src/lib/helpers/webidl.ts","../src/lib/simple-queue.ts","../src/lib/readable-stream/generic-reader.ts","../src/lib/abstract-ops/internal-methods.ts","../src/stub/number-isfinite.ts","../src/stub/math-trunc.ts","../src/lib/validators/basic.ts","../src/lib/validators/readable-stream.ts","../src/lib/readable-stream/default-reader.ts","../src/target/es2018/stub/async-iterator-prototype.ts","../src/lib/readable-stream/async-iterator.ts","../src/stub/number-isnan.ts","../src/lib/abstract-ops/ecmascript.ts","../src/lib/abstract-ops/miscellaneous.ts","../src/lib/abstract-ops/queue-with-sizes.ts","../src/lib/readable-stream/byte-stream-controller.ts","../src/lib/readable-stream/byob-reader.ts","../src/lib/abstract-ops/queuing-strategy.ts","../src/lib/validators/queuing-strategy.ts","../src/lib/validators/underlying-sink.ts","../src/lib/validators/writable-stream.ts","../src/lib/abort-signal.ts","../src/lib/writable-stream.ts","../src/stub/native.ts","../src/stub/dom-exception.ts","../src/lib/readable-stream/pipe.ts","../src/lib/readable-stream/default-controller.ts","../src/lib/readable-stream/tee.ts","../src/lib/validators/underlying-source.ts","../src/lib/validators/reader-options.ts","../src/lib/validators/iterator-options.ts","../src/lib/validators/pipe-options.ts","../src/lib/validators/readable-writable-pair.ts","../src/lib/readable-stream.ts","../src/lib/validators/queuing-strategy-init.ts","../src/lib/byte-length-queuing-strategy.ts","../src/lib/count-queuing-strategy.ts","../src/lib/validators/transformer.ts","../src/lib/transform-stream.ts","../src/polyfill.ts"],"sourcesContent":["/// <reference lib=\"es2015.symbol\" />\n\nconst SymbolPolyfill: (description?: string) => symbol =\n  typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol' ?\n    Symbol :\n    description => `Symbol(${description})` as any as symbol;\n\nexport default SymbolPolyfill;\n","/// <reference lib=\"dom\" />\n\nexport function noop(): undefined {\n  return undefined;\n}\n\nfunction getGlobals() {\n  if (typeof self !== 'undefined') {\n    return self;\n  } else if (typeof window !== 'undefined') {\n    return window;\n  } else if (typeof global !== 'undefined') {\n    return global;\n  }\n  return undefined;\n}\n\nexport const globals = getGlobals();\n","import { noop } from '../../utils';\nimport { AssertionError } from '../../stub/assert';\n\nexport function typeIsObject(x: any): x is object {\n  return (typeof x === 'object' && x !== null) || typeof x === 'function';\n}\n\nexport const rethrowAssertionErrorRejection: (e: any) => void =\n  DEBUG ? e => {\n    // Used throughout the reference implementation, as `.catch(rethrowAssertionErrorRejection)`, to ensure any errors\n    // get shown. There are places in the spec where we do promise transformations and purposefully ignore or don't\n    // expect any errors, but assertion errors are always problematic.\n    if (e && e instanceof AssertionError) {\n      setTimeout(() => {\n        throw e;\n      }, 0);\n    }\n  } : noop;\n","import { globals } from '../../utils';\nimport { rethrowAssertionErrorRejection } from './miscellaneous';\nimport assert from '../../stub/assert';\n\nconst originalPromise = Promise;\nconst originalPromiseThen = Promise.prototype.then;\nconst originalPromiseResolve = Promise.resolve.bind(originalPromise);\nconst originalPromiseReject = Promise.reject.bind(originalPromise);\n\nexport function newPromise<T>(executor: (\n  resolve: (value: T | PromiseLike<T>) => void,\n  reject: (reason?: any) => void\n) => void): Promise<T> {\n  return new originalPromise(executor);\n}\n\nexport function promiseResolvedWith<T>(value: T | PromiseLike<T>): Promise<T> {\n  return originalPromiseResolve(value);\n}\n\nexport function promiseRejectedWith<T = never>(reason: any): Promise<T> {\n  return originalPromiseReject(reason);\n}\n\nexport function PerformPromiseThen<T, TResult1 = T, TResult2 = never>(\n  promise: Promise<T>,\n  onFulfilled?: (value: T) => TResult1 | PromiseLike<TResult1>,\n  onRejected?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2> {\n  // There doesn't appear to be any way to correctly emulate the behaviour from JavaScript, so this is just an\n  // approximation.\n  return originalPromiseThen.call(promise, onFulfilled, onRejected) as Promise<TResult1 | TResult2>;\n}\n\nexport function uponPromise<T>(\n  promise: Promise<T>,\n  onFulfilled?: (value: T) => void | PromiseLike<void>,\n  onRejected?: (reason: any) => void | PromiseLike<void>): void {\n  PerformPromiseThen(\n    PerformPromiseThen(promise, onFulfilled, onRejected),\n    undefined,\n    rethrowAssertionErrorRejection\n  );\n}\n\nexport function uponFulfillment<T>(promise: Promise<T>, onFulfilled: (value: T) => void | PromiseLike<void>): void {\n  uponPromise(promise, onFulfilled);\n}\n\nexport function uponRejection(promise: Promise<unknown>, onRejected: (reason: any) => void | PromiseLike<void>): void {\n  uponPromise(promise, undefined, onRejected);\n}\n\nexport function transformPromiseWith<T, TResult1 = T, TResult2 = never>(\n  promise: Promise<T>,\n  fulfillmentHandler?: (value: T) => TResult1 | PromiseLike<TResult1>,\n  rejectionHandler?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2> {\n  return PerformPromiseThen(promise, fulfillmentHandler, rejectionHandler);\n}\n\nexport function setPromiseIsHandledToTrue(promise: Promise<unknown>): void {\n  PerformPromiseThen(promise, undefined, rethrowAssertionErrorRejection);\n}\n\nexport const queueMicrotask: (fn: () => void) => void = (() => {\n  const globalQueueMicrotask = globals && globals.queueMicrotask;\n  if (typeof globalQueueMicrotask === 'function') {\n    return globalQueueMicrotask;\n  }\n\n  const resolvedPromise = promiseResolvedWith(undefined);\n  return (fn: () => void) => PerformPromiseThen(resolvedPromise, fn);\n})();\n\nexport function reflectCall<T, A extends any[], R>(F: (this: T, ...fnArgs: A) => R, V: T, args: A): R {\n  if (typeof F !== 'function') {\n    throw new TypeError('Argument is not a function');\n  }\n  return Function.prototype.apply.call(F, V, args);\n}\n\nexport function promiseCall<T, A extends any[], R>(F: (this: T, ...fnArgs: A) => R | PromiseLike<R>,\n                                                   V: T,\n                                                   args: A): Promise<R> {\n  assert(typeof F === 'function');\n  assert(V !== undefined);\n  assert(Array.isArray(args));\n  try {\n    return promiseResolvedWith(reflectCall(F, V, args));\n  } catch (value) {\n    return promiseRejectedWith(value);\n  }\n}\n","import assert from '../stub/assert';\n\n// Original from Chromium\n// https://chromium.googlesource.com/chromium/src/+/0aee4434a4dba42a42abaea9bfbc0cd196a63bc1/third_party/blink/renderer/core/streams/SimpleQueue.js\n\nconst QUEUE_MAX_ARRAY_SIZE = 16384;\n\ninterface Node<T> {\n  _elements: T[];\n  _next: Node<T> | undefined;\n}\n\n/**\n * Simple queue structure.\n *\n * Avoids scalability issues with using a packed array directly by using\n * multiple arrays in a linked list and keeping the array size bounded.\n */\nexport class SimpleQueue<T> {\n  private _front: Node<T>;\n  private _back: Node<T>;\n  private _cursor = 0;\n  private _size = 0;\n\n  constructor() {\n    // _front and _back are always defined.\n    this._front = {\n      _elements: [],\n      _next: undefined\n    };\n    this._back = this._front;\n    // The cursor is used to avoid calling Array.shift().\n    // It contains the index of the front element of the array inside the\n    // front-most node. It is always in the range [0, QUEUE_MAX_ARRAY_SIZE).\n    this._cursor = 0;\n    // When there is only one node, size === elements.length - cursor.\n    this._size = 0;\n  }\n\n  get length(): number {\n    return this._size;\n  }\n\n  // For exception safety, this method is structured in order:\n  // 1. Read state\n  // 2. Calculate required state mutations\n  // 3. Perform state mutations\n  push(element: T): void {\n    const oldBack = this._back;\n    let newBack = oldBack;\n    assert(oldBack._next === undefined);\n    if (oldBack._elements.length === QUEUE_MAX_ARRAY_SIZE - 1) {\n      newBack = {\n        _elements: [],\n        _next: undefined\n      };\n    }\n\n    // push() is the mutation most likely to throw an exception, so it\n    // goes first.\n    oldBack._elements.push(element);\n    if (newBack !== oldBack) {\n      this._back = newBack;\n      oldBack._next = newBack;\n    }\n    ++this._size;\n  }\n\n  // Like push(), shift() follows the read -> calculate -> mutate pattern for\n  // exception safety.\n  shift(): T {\n    assert(this._size > 0); // must not be called on an empty queue\n\n    const oldFront = this._front;\n    let newFront = oldFront;\n    const oldCursor = this._cursor;\n    let newCursor = oldCursor + 1;\n\n    const elements = oldFront._elements;\n    const element = elements[oldCursor];\n\n    if (newCursor === QUEUE_MAX_ARRAY_SIZE) {\n      assert(elements.length === QUEUE_MAX_ARRAY_SIZE);\n      assert(oldFront._next !== undefined);\n      newFront = oldFront._next!;\n      newCursor = 0;\n    }\n\n    // No mutations before this point.\n    --this._size;\n    this._cursor = newCursor;\n    if (oldFront !== newFront) {\n      this._front = newFront;\n    }\n\n    // Permit shifted element to be garbage collected.\n    elements[oldCursor] = undefined!;\n\n    return element;\n  }\n\n  // The tricky thing about forEach() is that it can be called\n  // re-entrantly. The queue may be mutated inside the callback. It is easy to\n  // see that push() within the callback has no negative effects since the end\n  // of the queue is checked for on every iteration. If shift() is called\n  // repeatedly within the callback then the next iteration may return an\n  // element that has been removed. In this case the callback will be called\n  // with undefined values until we either \"catch up\" with elements that still\n  // exist or reach the back of the queue.\n  forEach(callback: (element: T) => void): void {\n    let i = this._cursor;\n    let node = this._front;\n    let elements = node._elements;\n    while (i !== elements.length || node._next !== undefined) {\n      if (i === elements.length) {\n        assert(node._next !== undefined);\n        assert(i === QUEUE_MAX_ARRAY_SIZE);\n        node = node._next!;\n        elements = node._elements;\n        i = 0;\n        if (elements.length === 0) {\n          break;\n        }\n      }\n      callback(elements[i]);\n      ++i;\n    }\n  }\n\n  // Return the element that would be returned if shift() was called now,\n  // without modifying the queue.\n  peek(): T {\n    assert(this._size > 0); // must not be called on an empty queue\n\n    const front = this._front;\n    const cursor = this._cursor;\n    return front._elements[cursor];\n  }\n}\n","import assert from '../../stub/assert';\nimport { ReadableStream, ReadableStreamCancel, ReadableStreamReader } from '../readable-stream';\nimport { newPromise, setPromiseIsHandledToTrue } from '../helpers/webidl';\n\nexport function ReadableStreamReaderGenericInitialize<R>(reader: ReadableStreamReader<R>, stream: ReadableStream<R>) {\n  reader._ownerReadableStream = stream;\n  stream._reader = reader;\n\n  if (stream._state === 'readable') {\n    defaultReaderClosedPromiseInitialize(reader);\n  } else if (stream._state === 'closed') {\n    defaultReaderClosedPromiseInitializeAsResolved(reader);\n  } else {\n    assert(stream._state === 'errored');\n\n    defaultReaderClosedPromiseInitializeAsRejected(reader, stream._storedError);\n  }\n}\n\n// A client of ReadableStreamDefaultReader and ReadableStreamBYOBReader may use these functions directly to bypass state\n// check.\n\nexport function ReadableStreamReaderGenericCancel(reader: ReadableStreamReader<any>, reason: any): Promise<undefined> {\n  const stream = reader._ownerReadableStream;\n  assert(stream !== undefined);\n  return ReadableStreamCancel(stream, reason);\n}\n\nexport function ReadableStreamReaderGenericRelease(reader: ReadableStreamReader<any>) {\n  assert(reader._ownerReadableStream !== undefined);\n  assert(reader._ownerReadableStream._reader === reader);\n\n  if (reader._ownerReadableStream._state === 'readable') {\n    defaultReaderClosedPromiseReject(\n      reader,\n      new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));\n  } else {\n    defaultReaderClosedPromiseResetToRejected(\n      reader,\n      new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));\n  }\n\n  reader._ownerReadableStream._reader = undefined;\n  reader._ownerReadableStream = undefined!;\n}\n\n// Helper functions for the readers.\n\nexport function readerLockException(name: string): TypeError {\n  return new TypeError('Cannot ' + name + ' a stream using a released reader');\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nexport function defaultReaderClosedPromiseInitialize(reader: ReadableStreamReader<any>) {\n  reader._closedPromise = newPromise((resolve, reject) => {\n    reader._closedPromise_resolve = resolve;\n    reader._closedPromise_reject = reject;\n  });\n}\n\nexport function defaultReaderClosedPromiseInitializeAsRejected(reader: ReadableStreamReader<any>, reason: any) {\n  defaultReaderClosedPromiseInitialize(reader);\n  defaultReaderClosedPromiseReject(reader, reason);\n}\n\nexport function defaultReaderClosedPromiseInitializeAsResolved(reader: ReadableStreamReader<any>) {\n  defaultReaderClosedPromiseInitialize(reader);\n  defaultReaderClosedPromiseResolve(reader);\n}\n\nexport function defaultReaderClosedPromiseReject(reader: ReadableStreamReader<any>, reason: any) {\n  if (reader._closedPromise_reject === undefined) {\n    return;\n  }\n\n  setPromiseIsHandledToTrue(reader._closedPromise);\n  reader._closedPromise_reject(reason);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n\nexport function defaultReaderClosedPromiseResetToRejected(reader: ReadableStreamReader<any>, reason: any) {\n  assert(reader._closedPromise_resolve === undefined);\n  assert(reader._closedPromise_reject === undefined);\n\n  defaultReaderClosedPromiseInitializeAsRejected(reader, reason);\n}\n\nexport function defaultReaderClosedPromiseResolve(reader: ReadableStreamReader<any>) {\n  if (reader._closedPromise_resolve === undefined) {\n    return;\n  }\n\n  reader._closedPromise_resolve(undefined);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n","export const AbortSteps = Symbol('[[AbortSteps]]');\nexport const ErrorSteps = Symbol('[[ErrorSteps]]');\nexport const CancelSteps = Symbol('[[CancelSteps]]');\nexport const PullSteps = Symbol('[[PullSteps]]');\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite#Polyfill\nconst NumberIsFinite: typeof Number.isFinite = Number.isFinite || function (x) {\n  return typeof x === 'number' && isFinite(x);\n};\n\nexport default NumberIsFinite;\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc#Polyfill\nconst MathTrunc: typeof Math.trunc = Math.trunc || function (v) {\n  return v < 0 ? Math.ceil(v) : Math.floor(v);\n};\n\nexport default MathTrunc;\n","import NumberIsFinite from '../../stub/number-isfinite';\nimport MathTrunc from '../../stub/math-trunc';\n\n// https://heycam.github.io/webidl/#idl-dictionaries\nexport function isDictionary(x: any): x is object | null {\n  return typeof x === 'object' || typeof x === 'function';\n}\n\nexport function assertDictionary(obj: unknown,\n                                 context: string): asserts obj is object | null | undefined {\n  if (obj !== undefined && !isDictionary(obj)) {\n    throw new TypeError(`${context} is not an object.`);\n  }\n}\n\nexport type AnyFunction = (...args: any[]) => any;\n\n// https://heycam.github.io/webidl/#idl-callback-functions\nexport function assertFunction(x: unknown, context: string): asserts x is AnyFunction {\n  if (typeof x !== 'function') {\n    throw new TypeError(`${context} is not a function.`);\n  }\n}\n\n// https://heycam.github.io/webidl/#idl-object\nexport function isObject(x: any): x is object {\n  return (typeof x === 'object' && x !== null) || typeof x === 'function';\n}\n\nexport function assertObject(x: unknown,\n                             context: string): asserts x is object {\n  if (!isObject(x)) {\n    throw new TypeError(`${context} is not an object.`);\n  }\n}\n\nexport function assertRequiredArgument<T extends any>(x: T | undefined,\n                                                      position: number,\n                                                      context: string): asserts x is T {\n  if (x === undefined) {\n    throw new TypeError(`Parameter ${position} is required in '${context}'.`);\n  }\n}\n\nexport function assertRequiredField<T extends any>(x: T | undefined,\n                                                   field: string,\n                                                   context: string): asserts x is T {\n  if (x === undefined) {\n    throw new TypeError(`${field} is required in '${context}'.`);\n  }\n}\n\n// https://heycam.github.io/webidl/#idl-unrestricted-double\nexport function convertUnrestrictedDouble(value: unknown): number {\n  return Number(value);\n}\n\nfunction censorNegativeZero(x: number): number {\n  return x === 0 ? 0 : x;\n}\n\nfunction integerPart(x: number): number {\n  return censorNegativeZero(MathTrunc(x));\n}\n\n// https://heycam.github.io/webidl/#idl-unsigned-long-long\nexport function convertUnsignedLongLongWithEnforceRange(value: unknown, context: string): number {\n  const lowerBound = 0;\n  const upperBound = Number.MAX_SAFE_INTEGER;\n\n  let x = Number(value);\n  x = censorNegativeZero(x);\n\n  if (!NumberIsFinite(x)) {\n    throw new TypeError(`${context} is not a finite number`);\n  }\n\n  x = integerPart(x);\n\n  if (x < lowerBound || x > upperBound) {\n    throw new TypeError(`${context} is outside the accepted range of ${lowerBound} to ${upperBound}, inclusive`);\n  }\n\n  if (!NumberIsFinite(x) || x === 0) {\n    return 0;\n  }\n\n  // TODO Use BigInt if supported?\n  // let xBigInt = BigInt(integerPart(x));\n  // xBigInt = BigInt.asUintN(64, xBigInt);\n  // return Number(xBigInt);\n\n  return x;\n}\n","import { IsReadableStream, ReadableStream } from '../readable-stream';\n\nexport function assertReadableStream(x: unknown, context: string): asserts x is ReadableStream {\n  if (!IsReadableStream(x)) {\n    throw new TypeError(`${context} is not a ReadableStream.`);\n  }\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericInitialize,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport { IsReadableStreamLocked, ReadableStream } from '../readable-stream';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { PullSteps } from '../abstract-ops/internal-methods';\nimport { newPromise, promiseRejectedWith } from '../helpers/webidl';\nimport { assertRequiredArgument } from '../validators/basic';\nimport { assertReadableStream } from '../validators/readable-stream';\n\n/**\n * A result returned by {@link ReadableStreamDefaultReader.read}.\n *\n * @public\n */\nexport type ReadableStreamDefaultReadResult<T> = {\n  done: false;\n  value: T;\n} | {\n  done: true;\n  value?: undefined;\n}\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamDefaultReader<R>(stream: ReadableStream): ReadableStreamDefaultReader<R> {\n  return new ReadableStreamDefaultReader(stream);\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamAddReadRequest<R>(stream: ReadableStream<R>,\n                                                readRequest: ReadRequest<R>): void {\n  assert(IsReadableStreamDefaultReader(stream._reader));\n  assert(stream._state === 'readable');\n\n  (stream._reader! as ReadableStreamDefaultReader<R>)._readRequests.push(readRequest);\n}\n\nexport function ReadableStreamFulfillReadRequest<R>(stream: ReadableStream<R>, chunk: R | undefined, done: boolean) {\n  const reader = stream._reader as ReadableStreamDefaultReader<R>;\n\n  assert(reader._readRequests.length > 0);\n\n  const readRequest = reader._readRequests.shift()!;\n  if (done) {\n    readRequest._closeSteps();\n  } else {\n    readRequest._chunkSteps(chunk!);\n  }\n}\n\nexport function ReadableStreamGetNumReadRequests<R>(stream: ReadableStream<R>): number {\n  return (stream._reader as ReadableStreamDefaultReader<R>)._readRequests.length;\n}\n\nexport function ReadableStreamHasDefaultReader(stream: ReadableStream): boolean {\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return false;\n  }\n\n  if (!IsReadableStreamDefaultReader(reader)) {\n    return false;\n  }\n\n  return true;\n}\n\n// Readers\n\nexport interface ReadRequest<R> {\n  _chunkSteps(chunk: R): void;\n\n  _closeSteps(): void;\n\n  _errorSteps(e: any): void;\n}\n\n/**\n * A default reader vended by a {@link ReadableStream}.\n *\n * @public\n */\nexport class ReadableStreamDefaultReader<R = any> {\n  /** @internal */\n  _ownerReadableStream!: ReadableStream<R>;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readRequests: SimpleQueue<ReadRequest<R>>;\n\n  constructor(stream: ReadableStream<R>) {\n    assertRequiredArgument(stream, 1, 'ReadableStreamDefaultReader');\n    assertReadableStream(stream, 'First parameter');\n\n    if (IsReadableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n    }\n\n    ReadableStreamReaderGenericInitialize(this, stream);\n\n    this._readRequests = new SimpleQueue();\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed,\n   * or rejected if the stream ever errors or the reader's lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('cancel'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('cancel'));\n    }\n\n    return ReadableStreamReaderGenericCancel(this, reason);\n  }\n\n  /**\n   * Returns a promise that allows access to the next chunk from the stream's internal queue, if available.\n   *\n   * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.\n   */\n  read(): Promise<ReadableStreamDefaultReadResult<R>> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('read'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('read from'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamDefaultReadResult<R>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamDefaultReadResult<R>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),\n      _closeSteps: () => resolvePromise({ value: undefined, done: true }),\n      _errorSteps: e => rejectPromise(e)\n    };\n    ReadableStreamDefaultReaderRead(this, readRequest);\n    return promise;\n  }\n\n  /**\n   * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.\n   * If the associated stream is errored when the lock is released, the reader will appear errored in the same way\n   * from now on; otherwise, the reader will appear closed.\n   *\n   * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by\n   * the reader's {@link ReadableStreamDefaultReader.read | read()} method has not yet been settled. Attempting to\n   * do so will throw a `TypeError` and leave the reader locked to the stream.\n   */\n  releaseLock(): void {\n    if (!IsReadableStreamDefaultReader(this)) {\n      throw defaultReaderBrandCheckException('releaseLock');\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return;\n    }\n\n    if (this._readRequests.length > 0) {\n      throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n    }\n\n    ReadableStreamReaderGenericRelease(this);\n  }\n}\n\nObject.defineProperties(ReadableStreamDefaultReader.prototype, {\n  cancel: { enumerable: true },\n  read: { enumerable: true },\n  releaseLock: { enumerable: true },\n  closed: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamDefaultReader.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamDefaultReader',\n    configurable: true\n  });\n}\n\n// Abstract operations for the readers.\n\nexport function IsReadableStreamDefaultReader<R = any>(x: any): x is ReadableStreamDefaultReader<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readRequests')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamDefaultReader;\n}\n\nexport function ReadableStreamDefaultReaderRead<R>(reader: ReadableStreamDefaultReader<R>,\n                                                   readRequest: ReadRequest<R>): void {\n  const stream = reader._ownerReadableStream;\n\n  assert(stream !== undefined);\n\n  stream._disturbed = true;\n\n  if (stream._state === 'closed') {\n    readRequest._closeSteps();\n  } else if (stream._state === 'errored') {\n    readRequest._errorSteps(stream._storedError);\n  } else {\n    assert(stream._state === 'readable');\n    stream._readableStreamController[PullSteps](readRequest as ReadRequest<any>);\n  }\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nfunction defaultReaderBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamDefaultReader.prototype.${name} can only be used on a ReadableStreamDefaultReader`);\n}\n","/// <reference lib=\"es2018.asynciterable\" />\n\n/* eslint-disable @typescript-eslint/no-empty-function */\nexport const AsyncIteratorPrototype: AsyncIterable<any> | undefined =\n  Object.getPrototypeOf(Object.getPrototypeOf(async function* (): AsyncIterableIterator<any> {}).prototype);\n","/// <reference lib=\"es2018.asynciterable\" />\n\nimport { ReadableStream } from '../readable-stream';\nimport {\n  AcquireReadableStreamDefaultReader,\n  ReadableStreamDefaultReader,\n  ReadableStreamDefaultReaderRead,\n  ReadableStreamDefaultReadResult,\n  ReadRequest\n} from './default-reader';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport assert from '../../stub/assert';\nimport { AsyncIteratorPrototype } from '@@target/stub/async-iterator-prototype';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport {\n  newPromise,\n  promiseRejectedWith,\n  promiseResolvedWith,\n  queueMicrotask,\n  transformPromiseWith\n} from '../helpers/webidl';\n\n/**\n * An async iterator returned by {@link ReadableStream.values}.\n *\n * @public\n */\nexport interface ReadableStreamAsyncIterator<R> extends AsyncIterator<R> {\n  next(): Promise<IteratorResult<R, undefined>>;\n\n  return(value?: any): Promise<IteratorResult<any>>;\n}\n\nexport class ReadableStreamAsyncIteratorImpl<R> {\n  private readonly _reader: ReadableStreamDefaultReader<R>;\n  private readonly _preventCancel: boolean;\n  private _ongoingPromise: Promise<ReadableStreamDefaultReadResult<R>> | undefined = undefined;\n  private _isFinished = false;\n\n  constructor(reader: ReadableStreamDefaultReader<R>, preventCancel: boolean) {\n    this._reader = reader;\n    this._preventCancel = preventCancel;\n  }\n\n  next(): Promise<ReadableStreamDefaultReadResult<R>> {\n    const nextSteps = () => this._nextSteps();\n    this._ongoingPromise = this._ongoingPromise ?\n      transformPromiseWith(this._ongoingPromise, nextSteps, nextSteps) :\n      nextSteps();\n    return this._ongoingPromise;\n  }\n\n  return(value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    const returnSteps = () => this._returnSteps(value);\n    return this._ongoingPromise ?\n      transformPromiseWith(this._ongoingPromise, returnSteps, returnSteps) :\n      returnSteps();\n  }\n\n  private _nextSteps(): Promise<ReadableStreamDefaultReadResult<R>> {\n    if (this._isFinished) {\n      return Promise.resolve({ value: undefined, done: true });\n    }\n\n    const reader = this._reader;\n    if (reader._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('iterate'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamDefaultReadResult<R>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamDefaultReadResult<R>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => {\n        this._ongoingPromise = undefined;\n        // This needs to be delayed by one microtask, otherwise we stop pulling too early which breaks a test.\n        // FIXME Is this a bug in the specification, or in the test?\n        queueMicrotask(() => resolvePromise({ value: chunk, done: false }));\n      },\n      _closeSteps: () => {\n        this._ongoingPromise = undefined;\n        this._isFinished = true;\n        ReadableStreamReaderGenericRelease(reader);\n        resolvePromise({ value: undefined, done: true });\n      },\n      _errorSteps: reason => {\n        this._ongoingPromise = undefined;\n        this._isFinished = true;\n        ReadableStreamReaderGenericRelease(reader);\n        rejectPromise(reason);\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n    return promise;\n  }\n\n  private _returnSteps(value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (this._isFinished) {\n      return Promise.resolve({ value, done: true });\n    }\n    this._isFinished = true;\n\n    const reader = this._reader;\n    if (reader._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('finish iterating'));\n    }\n\n    assert(reader._readRequests.length === 0);\n\n    if (!this._preventCancel) {\n      const result = ReadableStreamReaderGenericCancel(reader, value);\n      ReadableStreamReaderGenericRelease(reader);\n      return transformPromiseWith(result, () => ({ value, done: true }));\n    }\n\n    ReadableStreamReaderGenericRelease(reader);\n    return promiseResolvedWith({ value, done: true });\n  }\n}\n\ndeclare class ReadableStreamAsyncIteratorInstance<R> implements ReadableStreamAsyncIterator<R> {\n  /** @interal */\n  _asyncIteratorImpl: ReadableStreamAsyncIteratorImpl<R>;\n\n  next(): Promise<IteratorResult<R, undefined>>;\n\n  return(value?: any): Promise<IteratorResult<any>>;\n}\n\nconst ReadableStreamAsyncIteratorPrototype: ReadableStreamAsyncIteratorInstance<any> = {\n  next(this: ReadableStreamAsyncIteratorInstance<any>): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (!IsReadableStreamAsyncIterator(this)) {\n      return promiseRejectedWith(streamAsyncIteratorBrandCheckException('next'));\n    }\n    return this._asyncIteratorImpl.next();\n  },\n\n  return(this: ReadableStreamAsyncIteratorInstance<any>, value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (!IsReadableStreamAsyncIterator(this)) {\n      return promiseRejectedWith(streamAsyncIteratorBrandCheckException('return'));\n    }\n    return this._asyncIteratorImpl.return(value);\n  }\n} as any;\nif (AsyncIteratorPrototype !== undefined) {\n  Object.setPrototypeOf(ReadableStreamAsyncIteratorPrototype, AsyncIteratorPrototype);\n}\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamAsyncIterator<R>(stream: ReadableStream<R>,\n                                                      preventCancel: boolean): ReadableStreamAsyncIterator<R> {\n  const reader = AcquireReadableStreamDefaultReader<R>(stream);\n  const impl = new ReadableStreamAsyncIteratorImpl(reader, preventCancel);\n  const iterator: ReadableStreamAsyncIteratorInstance<R> = Object.create(ReadableStreamAsyncIteratorPrototype);\n  iterator._asyncIteratorImpl = impl;\n  return iterator;\n}\n\nfunction IsReadableStreamAsyncIterator<R = any>(x: any): x is ReadableStreamAsyncIterator<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_asyncIteratorImpl')) {\n    return false;\n  }\n\n  try {\n    // noinspection SuspiciousTypeOfGuard\n    return (x as ReadableStreamAsyncIteratorInstance<any>)._asyncIteratorImpl instanceof\n      ReadableStreamAsyncIteratorImpl;\n  } catch {\n    return false;\n  }\n}\n\n// Helper functions for the ReadableStream.\n\nfunction streamAsyncIteratorBrandCheckException(name: string): TypeError {\n  return new TypeError(`ReadableStreamAsyncIterator.${name} can only be used on a ReadableSteamAsyncIterator`);\n}\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Polyfill\nconst NumberIsNaN: typeof Number.isNaN = Number.isNaN || function (x) {\n  // eslint-disable-next-line no-self-compare\n  return x !== x;\n};\n\nexport default NumberIsNaN;\n","export function CreateArrayFromList<T extends any[]>(elements: T): T {\n  // We use arrays to represent lists, so this is basically a no-op.\n  // Do a slice though just in case we happen to depend on the unique-ness.\n  return elements.slice() as T;\n}\n\nexport function CopyDataBlockBytes(dest: ArrayBuffer,\n                                   destOffset: number,\n                                   src: ArrayBuffer,\n                                   srcOffset: number,\n                                   n: number) {\n  new Uint8Array(dest).set(new Uint8Array(src, srcOffset, n), destOffset);\n}\n\n// Not implemented correctly\nexport function TransferArrayBuffer<T extends ArrayBufferLike>(O: T): T {\n  return O;\n}\n\n// Not implemented correctly\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nexport function CanTransferArrayBuffer(O: ArrayBufferLike): boolean {\n  return true;\n}\n\n// Not implemented correctly\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nexport function IsDetachedBuffer(O: ArrayBufferLike): boolean {\n  return false;\n}\n\nexport function ArrayBufferSlice(buffer: ArrayBufferLike, begin: number, end: number): ArrayBufferLike {\n  // ArrayBuffer.prototype.slice is not available on IE10\n  // https://www.caniuse.com/mdn-javascript_builtins_arraybuffer_slice\n  if (buffer.slice) {\n    return buffer.slice(begin, end);\n  }\n  const length = end - begin;\n  const slice = new ArrayBuffer(length);\n  CopyDataBlockBytes(slice, 0, buffer, begin, length);\n  return slice;\n}\n","import NumberIsNaN from '../../stub/number-isnan';\nimport { ArrayBufferSlice } from './ecmascript';\n\nexport function IsNonNegativeNumber(v: number): boolean {\n  if (typeof v !== 'number') {\n    return false;\n  }\n\n  if (NumberIsNaN(v)) {\n    return false;\n  }\n\n  if (v < 0) {\n    return false;\n  }\n\n  return true;\n}\n\nexport function CloneAsUint8Array(O: ArrayBufferView): Uint8Array {\n  const buffer = ArrayBufferSlice(O.buffer, O.byteOffset, O.byteOffset + O.byteLength);\n  return new Uint8Array(buffer);\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport { IsNonNegativeNumber } from './miscellaneous';\n\nexport interface QueueContainer<T> {\n  _queue: SimpleQueue<T>;\n  _queueTotalSize: number;\n}\n\nexport interface QueuePair<T> {\n  value: T;\n  size: number;\n}\n\nexport function DequeueValue<T>(container: QueueContainer<QueuePair<T>>): T {\n  assert('_queue' in container && '_queueTotalSize' in container);\n  assert(container._queue.length > 0);\n\n  const pair = container._queue.shift()!;\n  container._queueTotalSize -= pair.size;\n  if (container._queueTotalSize < 0) {\n    container._queueTotalSize = 0;\n  }\n\n  return pair.value;\n}\n\nexport function EnqueueValueWithSize<T>(container: QueueContainer<QueuePair<T>>, value: T, size: number) {\n  assert('_queue' in container && '_queueTotalSize' in container);\n\n  if (!IsNonNegativeNumber(size) || size === Infinity) {\n    throw new RangeError('Size must be a finite, non-NaN, non-negative number.');\n  }\n\n  container._queue.push({ value, size });\n  container._queueTotalSize += size;\n}\n\nexport function PeekQueueValue<T>(container: QueueContainer<QueuePair<T>>): T {\n  assert('_queue' in container && '_queueTotalSize' in container);\n  assert(container._queue.length > 0);\n\n  const pair = container._queue.peek();\n  return pair.value;\n}\n\nexport function ResetQueue<T>(container: QueueContainer<T>) {\n  assert('_queue' in container && '_queueTotalSize' in container);\n\n  container._queue = new SimpleQueue<T>();\n  container._queueTotalSize = 0;\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport { ResetQueue } from '../abstract-ops/queue-with-sizes';\nimport {\n  ReadableStreamAddReadRequest,\n  ReadableStreamFulfillReadRequest,\n  ReadableStreamGetNumReadRequests,\n  ReadableStreamHasDefaultReader,\n  ReadRequest\n} from './default-reader';\nimport {\n  ReadableStreamAddReadIntoRequest,\n  ReadableStreamFulfillReadIntoRequest,\n  ReadableStreamGetNumReadIntoRequests,\n  ReadableStreamHasBYOBReader,\n  ReadIntoRequest\n} from './byob-reader';\nimport NumberIsInteger from '../../stub/number-isinteger';\nimport {\n  IsReadableStreamLocked,\n  ReadableByteStream,\n  ReadableStreamClose,\n  ReadableStreamError\n} from '../readable-stream';\nimport { ValidatedUnderlyingByteSource } from './underlying-source';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport {\n  ArrayBufferSlice,\n  CanTransferArrayBuffer,\n  CopyDataBlockBytes,\n  IsDetachedBuffer,\n  TransferArrayBuffer\n} from '../abstract-ops/ecmascript';\nimport { CancelSteps, PullSteps } from '../abstract-ops/internal-methods';\nimport { promiseResolvedWith, uponPromise } from '../helpers/webidl';\nimport { assertRequiredArgument, convertUnsignedLongLongWithEnforceRange } from '../validators/basic';\n\n/**\n * A pull-into request in a {@link ReadableByteStreamController}.\n *\n * @public\n */\nexport class ReadableStreamBYOBRequest {\n  /** @internal */\n  _associatedReadableByteStreamController!: ReadableByteStreamController;\n  /** @internal */\n  _view!: ArrayBufferView | null;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the view for writing in to, or `null` if the BYOB request has already been responded to.\n   */\n  get view(): ArrayBufferView | null {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('view');\n    }\n\n    return this._view;\n  }\n\n  /**\n   * Indicates to the associated readable byte stream that `bytesWritten` bytes were written into\n   * {@link ReadableStreamBYOBRequest.view | view}, causing the result be surfaced to the consumer.\n   *\n   * After this method is called, {@link ReadableStreamBYOBRequest.view | view} will be transferred and no longer\n   * modifiable.\n   */\n  respond(bytesWritten: number): void;\n  respond(bytesWritten: number | undefined): void {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('respond');\n    }\n    assertRequiredArgument(bytesWritten, 1, 'respond');\n    bytesWritten = convertUnsignedLongLongWithEnforceRange(bytesWritten, 'First parameter');\n\n    if (this._associatedReadableByteStreamController === undefined) {\n      throw new TypeError('This BYOB request has been invalidated');\n    }\n\n    if (IsDetachedBuffer(this._view!.buffer)) {\n      throw new TypeError(`The BYOB request's buffer has been detached and so cannot be used as a response`);\n    }\n\n    assert(this._view!.byteLength > 0);\n    assert(this._view!.buffer.byteLength > 0);\n\n    ReadableByteStreamControllerRespond(this._associatedReadableByteStreamController, bytesWritten);\n  }\n\n  /**\n   * Indicates to the associated readable byte stream that instead of writing into\n   * {@link ReadableStreamBYOBRequest.view | view}, the underlying byte source is providing a new `ArrayBufferView`,\n   * which will be given to the consumer of the readable byte stream.\n   *\n   * After this method is called, `view` will be transferred and no longer modifiable.\n   */\n  respondWithNewView(view: ArrayBufferView): void;\n  respondWithNewView(view: ArrayBufferView | undefined): void {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('respondWithNewView');\n    }\n    assertRequiredArgument(view, 1, 'respondWithNewView');\n\n    if (!ArrayBuffer.isView(view)) {\n      throw new TypeError('You can only respond with array buffer views');\n    }\n\n    if (this._associatedReadableByteStreamController === undefined) {\n      throw new TypeError('This BYOB request has been invalidated');\n    }\n\n    if (IsDetachedBuffer(view.buffer)) {\n      throw new TypeError('The given view\\'s buffer has been detached and so cannot be used as a response');\n    }\n\n    ReadableByteStreamControllerRespondWithNewView(this._associatedReadableByteStreamController, view);\n  }\n}\n\nObject.defineProperties(ReadableStreamBYOBRequest.prototype, {\n  respond: { enumerable: true },\n  respondWithNewView: { enumerable: true },\n  view: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamBYOBRequest.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamBYOBRequest',\n    configurable: true\n  });\n}\n\ninterface ArrayBufferViewConstructor<T extends ArrayBufferView = ArrayBufferView> {\n  new(buffer: ArrayBufferLike, byteOffset: number, length?: number): T;\n\n  readonly prototype: T;\n  readonly BYTES_PER_ELEMENT: number;\n}\n\ninterface ByteQueueElement {\n  buffer: ArrayBufferLike;\n  byteOffset: number;\n  byteLength: number;\n}\n\ntype PullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> =\n  DefaultPullIntoDescriptor\n  | BYOBPullIntoDescriptor<T>;\n\ninterface DefaultPullIntoDescriptor {\n  buffer: ArrayBufferLike;\n  bufferByteLength: number;\n  byteOffset: number;\n  byteLength: number;\n  bytesFilled: number;\n  elementSize: number;\n  viewConstructor: ArrayBufferViewConstructor<Uint8Array>;\n  readerType: 'default';\n}\n\ninterface BYOBPullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> {\n  buffer: ArrayBufferLike;\n  bufferByteLength: number;\n  byteOffset: number;\n  byteLength: number;\n  bytesFilled: number;\n  elementSize: number;\n  viewConstructor: ArrayBufferViewConstructor<T>;\n  readerType: 'byob';\n}\n\n/**\n * Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue.\n *\n * @public\n */\nexport class ReadableByteStreamController {\n  /** @internal */\n  _controlledReadableByteStream!: ReadableByteStream;\n  /** @internal */\n  _queue!: SimpleQueue<ByteQueueElement>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _closeRequested!: boolean;\n  /** @internal */\n  _pullAgain!: boolean;\n  /** @internal */\n  _pulling !: boolean;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _pullAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _cancelAlgorithm!: (reason: any) => Promise<void>;\n  /** @internal */\n  _autoAllocateChunkSize: number | undefined;\n  /** @internal */\n  _byobRequest: ReadableStreamBYOBRequest | null;\n  /** @internal */\n  _pendingPullIntos!: SimpleQueue<PullIntoDescriptor>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the current BYOB pull request, or `null` if there isn't one.\n   */\n  get byobRequest(): ReadableStreamBYOBRequest | null {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('byobRequest');\n    }\n\n    return ReadableByteStreamControllerGetBYOBRequest(this);\n  }\n\n  /**\n   * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is\n   * over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure.\n   */\n  get desiredSize(): number | null {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('desiredSize');\n    }\n\n    return ReadableByteStreamControllerGetDesiredSize(this);\n  }\n\n  /**\n   * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from\n   * the stream, but once those are read, the stream will become closed.\n   */\n  close(): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('close');\n    }\n\n    if (this._closeRequested) {\n      throw new TypeError('The stream has already been closed; do not close it again!');\n    }\n\n    const state = this._controlledReadableByteStream._state;\n    if (state !== 'readable') {\n      throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be closed`);\n    }\n\n    ReadableByteStreamControllerClose(this);\n  }\n\n  /**\n   * Enqueues the given chunk chunk in the controlled readable stream.\n   * The chunk has to be an `ArrayBufferView` instance, or else a `TypeError` will be thrown.\n   */\n  enqueue(chunk: ArrayBufferView): void;\n  enqueue(chunk: ArrayBufferView | undefined): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('enqueue');\n    }\n\n    assertRequiredArgument(chunk, 1, 'enqueue');\n    if (!ArrayBuffer.isView(chunk)) {\n      throw new TypeError('chunk must be an array buffer view');\n    }\n    if (chunk.byteLength === 0) {\n      throw new TypeError('chunk must have non-zero byteLength');\n    }\n    if (chunk.buffer.byteLength === 0) {\n      throw new TypeError(`chunk's buffer must have non-zero byteLength`);\n    }\n\n    if (this._closeRequested) {\n      throw new TypeError('stream is closed or draining');\n    }\n\n    const state = this._controlledReadableByteStream._state;\n    if (state !== 'readable') {\n      throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be enqueued to`);\n    }\n\n    ReadableByteStreamControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.\n   */\n  error(e: any = undefined): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('error');\n    }\n\n    ReadableByteStreamControllerError(this, e);\n  }\n\n  /** @internal */\n  [CancelSteps](reason: any): Promise<void> {\n    ReadableByteStreamControllerClearPendingPullIntos(this);\n\n    ResetQueue(this);\n\n    const result = this._cancelAlgorithm(reason);\n    ReadableByteStreamControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [PullSteps](readRequest: ReadRequest<Uint8Array>): void {\n    const stream = this._controlledReadableByteStream;\n    assert(ReadableStreamHasDefaultReader(stream));\n\n    if (this._queueTotalSize > 0) {\n      assert(ReadableStreamGetNumReadRequests(stream) === 0);\n\n      const entry = this._queue.shift()!;\n      this._queueTotalSize -= entry.byteLength;\n\n      ReadableByteStreamControllerHandleQueueDrain(this);\n\n      const view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);\n\n      readRequest._chunkSteps(view);\n      return;\n    }\n\n    const autoAllocateChunkSize = this._autoAllocateChunkSize;\n    if (autoAllocateChunkSize !== undefined) {\n      let buffer: ArrayBuffer;\n      try {\n        buffer = new ArrayBuffer(autoAllocateChunkSize);\n      } catch (bufferE) {\n        readRequest._errorSteps(bufferE);\n        return;\n      }\n\n      const pullIntoDescriptor: DefaultPullIntoDescriptor = {\n        buffer,\n        bufferByteLength: autoAllocateChunkSize,\n        byteOffset: 0,\n        byteLength: autoAllocateChunkSize,\n        bytesFilled: 0,\n        elementSize: 1,\n        viewConstructor: Uint8Array,\n        readerType: 'default'\n      };\n\n      this._pendingPullIntos.push(pullIntoDescriptor);\n    }\n\n    ReadableStreamAddReadRequest(stream, readRequest);\n    ReadableByteStreamControllerCallPullIfNeeded(this);\n  }\n}\n\nObject.defineProperties(ReadableByteStreamController.prototype, {\n  close: { enumerable: true },\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  byobRequest: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableByteStreamController.prototype, Symbol.toStringTag, {\n    value: 'ReadableByteStreamController',\n    configurable: true\n  });\n}\n\n// Abstract operations for the ReadableByteStreamController.\n\nexport function IsReadableByteStreamController(x: any): x is ReadableByteStreamController {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableByteStream')) {\n    return false;\n  }\n\n  return x instanceof ReadableByteStreamController;\n}\n\nfunction IsReadableStreamBYOBRequest(x: any): x is ReadableStreamBYOBRequest {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_associatedReadableByteStreamController')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamBYOBRequest;\n}\n\nfunction ReadableByteStreamControllerCallPullIfNeeded(controller: ReadableByteStreamController): void {\n  const shouldPull = ReadableByteStreamControllerShouldCallPull(controller);\n  if (!shouldPull) {\n    return;\n  }\n\n  if (controller._pulling) {\n    controller._pullAgain = true;\n    return;\n  }\n\n  assert(!controller._pullAgain);\n\n  controller._pulling = true;\n\n  // TODO: Test controller argument\n  const pullPromise = controller._pullAlgorithm();\n  uponPromise(\n    pullPromise,\n    () => {\n      controller._pulling = false;\n\n      if (controller._pullAgain) {\n        controller._pullAgain = false;\n        ReadableByteStreamControllerCallPullIfNeeded(controller);\n      }\n    },\n    e => {\n      ReadableByteStreamControllerError(controller, e);\n    }\n  );\n}\n\nfunction ReadableByteStreamControllerClearPendingPullIntos(controller: ReadableByteStreamController) {\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n  controller._pendingPullIntos = new SimpleQueue();\n}\n\nfunction ReadableByteStreamControllerCommitPullIntoDescriptor<T extends ArrayBufferView>(\n  stream: ReadableByteStream,\n  pullIntoDescriptor: PullIntoDescriptor<T>\n) {\n  assert(stream._state !== 'errored');\n\n  let done = false;\n  if (stream._state === 'closed') {\n    assert(pullIntoDescriptor.bytesFilled === 0);\n    done = true;\n  }\n\n  const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);\n  if (pullIntoDescriptor.readerType === 'default') {\n    ReadableStreamFulfillReadRequest(stream, filledView as unknown as Uint8Array, done);\n  } else {\n    assert(pullIntoDescriptor.readerType === 'byob');\n    ReadableStreamFulfillReadIntoRequest(stream, filledView, done);\n  }\n}\n\nfunction ReadableByteStreamControllerConvertPullIntoDescriptor<T extends ArrayBufferView>(\n  pullIntoDescriptor: PullIntoDescriptor<T>\n): T {\n  const bytesFilled = pullIntoDescriptor.bytesFilled;\n  const elementSize = pullIntoDescriptor.elementSize;\n\n  assert(bytesFilled <= pullIntoDescriptor.byteLength);\n  assert(bytesFilled % elementSize === 0);\n\n  return new pullIntoDescriptor.viewConstructor(\n    pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize) as T;\n}\n\nfunction ReadableByteStreamControllerEnqueueChunkToQueue(controller: ReadableByteStreamController,\n                                                         buffer: ArrayBufferLike,\n                                                         byteOffset: number,\n                                                         byteLength: number) {\n  controller._queue.push({ buffer, byteOffset, byteLength });\n  controller._queueTotalSize += byteLength;\n}\n\nfunction ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller: ReadableByteStreamController,\n                                                                     pullIntoDescriptor: PullIntoDescriptor) {\n  const elementSize = pullIntoDescriptor.elementSize;\n\n  const currentAlignedBytes = pullIntoDescriptor.bytesFilled - pullIntoDescriptor.bytesFilled % elementSize;\n\n  const maxBytesToCopy = Math.min(controller._queueTotalSize,\n                                  pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled);\n  const maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;\n  const maxAlignedBytes = maxBytesFilled - maxBytesFilled % elementSize;\n\n  let totalBytesToCopyRemaining = maxBytesToCopy;\n  let ready = false;\n  if (maxAlignedBytes > currentAlignedBytes) {\n    totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled;\n    ready = true;\n  }\n\n  const queue = controller._queue;\n\n  while (totalBytesToCopyRemaining > 0) {\n    const headOfQueue = queue.peek();\n\n    const bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength);\n\n    const destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n    CopyDataBlockBytes(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy);\n\n    if (headOfQueue.byteLength === bytesToCopy) {\n      queue.shift();\n    } else {\n      headOfQueue.byteOffset += bytesToCopy;\n      headOfQueue.byteLength -= bytesToCopy;\n    }\n    controller._queueTotalSize -= bytesToCopy;\n\n    ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor);\n\n    totalBytesToCopyRemaining -= bytesToCopy;\n  }\n\n  if (!ready) {\n    assert(controller._queueTotalSize === 0);\n    assert(pullIntoDescriptor.bytesFilled > 0);\n    assert(pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize);\n  }\n\n  return ready;\n}\n\nfunction ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller: ReadableByteStreamController,\n                                                                size: number,\n                                                                pullIntoDescriptor: PullIntoDescriptor) {\n  assert(controller._pendingPullIntos.length === 0 || controller._pendingPullIntos.peek() === pullIntoDescriptor);\n  assert(controller._byobRequest === null);\n  pullIntoDescriptor.bytesFilled += size;\n}\n\nfunction ReadableByteStreamControllerHandleQueueDrain(controller: ReadableByteStreamController) {\n  assert(controller._controlledReadableByteStream._state === 'readable');\n\n  if (controller._queueTotalSize === 0 && controller._closeRequested) {\n    ReadableByteStreamControllerClearAlgorithms(controller);\n    ReadableStreamClose(controller._controlledReadableByteStream);\n  } else {\n    ReadableByteStreamControllerCallPullIfNeeded(controller);\n  }\n}\n\nfunction ReadableByteStreamControllerInvalidateBYOBRequest(controller: ReadableByteStreamController) {\n  if (controller._byobRequest === null) {\n    return;\n  }\n\n  controller._byobRequest._associatedReadableByteStreamController = undefined!;\n  controller._byobRequest._view = null!;\n  controller._byobRequest = null;\n}\n\nfunction ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller: ReadableByteStreamController) {\n  assert(!controller._closeRequested);\n\n  while (controller._pendingPullIntos.length > 0) {\n    if (controller._queueTotalSize === 0) {\n      return;\n    }\n\n    const pullIntoDescriptor = controller._pendingPullIntos.peek();\n\n    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {\n      ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n      ReadableByteStreamControllerCommitPullIntoDescriptor(\n        controller._controlledReadableByteStream,\n        pullIntoDescriptor\n      );\n    }\n  }\n}\n\nexport function ReadableByteStreamControllerPullInto<T extends ArrayBufferView>(\n  controller: ReadableByteStreamController,\n  view: T,\n  readIntoRequest: ReadIntoRequest<T>\n): void {\n  const stream = controller._controlledReadableByteStream;\n\n  let elementSize = 1;\n  if (view.constructor !== DataView) {\n    elementSize = (view.constructor as ArrayBufferViewConstructor<T>).BYTES_PER_ELEMENT;\n  }\n\n  const ctor = view.constructor as ArrayBufferViewConstructor<T>;\n\n  // try {\n  const buffer = TransferArrayBuffer(view.buffer);\n  // } catch (e) {\n  //   readIntoRequest._errorSteps(e);\n  //   return;\n  // }\n\n  const pullIntoDescriptor: BYOBPullIntoDescriptor<T> = {\n    buffer,\n    bufferByteLength: buffer.byteLength,\n    byteOffset: view.byteOffset,\n    byteLength: view.byteLength,\n    bytesFilled: 0,\n    elementSize,\n    viewConstructor: ctor,\n    readerType: 'byob'\n  };\n\n  if (controller._pendingPullIntos.length > 0) {\n    controller._pendingPullIntos.push(pullIntoDescriptor);\n\n    // No ReadableByteStreamControllerCallPullIfNeeded() call since:\n    // - No change happens on desiredSize\n    // - The source has already been notified of that there's at least 1 pending read(view)\n\n    ReadableStreamAddReadIntoRequest(stream, readIntoRequest);\n    return;\n  }\n\n  if (stream._state === 'closed') {\n    const emptyView = new ctor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0);\n    readIntoRequest._closeSteps(emptyView);\n    return;\n  }\n\n  if (controller._queueTotalSize > 0) {\n    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {\n      const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);\n\n      ReadableByteStreamControllerHandleQueueDrain(controller);\n\n      readIntoRequest._chunkSteps(filledView);\n      return;\n    }\n\n    if (controller._closeRequested) {\n      const e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n      ReadableByteStreamControllerError(controller, e);\n\n      readIntoRequest._errorSteps(e);\n      return;\n    }\n  }\n\n  controller._pendingPullIntos.push(pullIntoDescriptor);\n\n  ReadableStreamAddReadIntoRequest<T>(stream, readIntoRequest);\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nfunction ReadableByteStreamControllerRespondInClosedState(controller: ReadableByteStreamController,\n                                                          firstDescriptor: PullIntoDescriptor) {\n  assert(firstDescriptor.bytesFilled === 0);\n\n  const stream = controller._controlledReadableByteStream;\n  if (ReadableStreamHasBYOBReader(stream)) {\n    while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n      const pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);\n      ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);\n    }\n  }\n}\n\nfunction ReadableByteStreamControllerRespondInReadableState(controller: ReadableByteStreamController,\n                                                            bytesWritten: number,\n                                                            pullIntoDescriptor: PullIntoDescriptor) {\n  assert(pullIntoDescriptor.bytesFilled + bytesWritten <= pullIntoDescriptor.byteLength);\n\n  ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor);\n\n  if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {\n    return;\n  }\n\n  ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n  const remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize;\n  if (remainderSize > 0) {\n    const end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n    const remainder = ArrayBufferSlice(pullIntoDescriptor.buffer, end - remainderSize, end);\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength);\n  }\n\n  pullIntoDescriptor.bytesFilled -= remainderSize;\n  ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);\n\n  ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n}\n\nfunction ReadableByteStreamControllerRespondInternal(controller: ReadableByteStreamController, bytesWritten: number) {\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  assert(CanTransferArrayBuffer(firstDescriptor.buffer));\n\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n\n  const state = controller._controlledReadableByteStream._state;\n  if (state === 'closed') {\n    assert(bytesWritten === 0);\n    ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor);\n  } else {\n    assert(state === 'readable');\n    assert(bytesWritten > 0);\n    ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);\n  }\n\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nfunction ReadableByteStreamControllerShiftPendingPullInto(\n  controller: ReadableByteStreamController\n): PullIntoDescriptor {\n  assert(controller._byobRequest === null);\n  const descriptor = controller._pendingPullIntos.shift()!;\n  return descriptor;\n}\n\nfunction ReadableByteStreamControllerShouldCallPull(controller: ReadableByteStreamController): boolean {\n  const stream = controller._controlledReadableByteStream;\n\n  if (stream._state !== 'readable') {\n    return false;\n  }\n\n  if (controller._closeRequested) {\n    return false;\n  }\n\n  if (!controller._started) {\n    return false;\n  }\n\n  if (ReadableStreamHasDefaultReader(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    return true;\n  }\n\n  if (ReadableStreamHasBYOBReader(stream) && ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n    return true;\n  }\n\n  const desiredSize = ReadableByteStreamControllerGetDesiredSize(controller);\n  assert(desiredSize !== null);\n  if (desiredSize! > 0) {\n    return true;\n  }\n\n  return false;\n}\n\nfunction ReadableByteStreamControllerClearAlgorithms(controller: ReadableByteStreamController) {\n  controller._pullAlgorithm = undefined!;\n  controller._cancelAlgorithm = undefined!;\n}\n\n// A client of ReadableByteStreamController may use these functions directly to bypass state check.\n\nexport function ReadableByteStreamControllerClose(controller: ReadableByteStreamController) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (controller._closeRequested || stream._state !== 'readable') {\n    return;\n  }\n\n  if (controller._queueTotalSize > 0) {\n    controller._closeRequested = true;\n\n    return;\n  }\n\n  if (controller._pendingPullIntos.length > 0) {\n    const firstPendingPullInto = controller._pendingPullIntos.peek();\n    if (firstPendingPullInto.bytesFilled > 0) {\n      const e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n      ReadableByteStreamControllerError(controller, e);\n\n      throw e;\n    }\n  }\n\n  ReadableByteStreamControllerClearAlgorithms(controller);\n  ReadableStreamClose(stream);\n}\n\nexport function ReadableByteStreamControllerEnqueue(controller: ReadableByteStreamController, chunk: ArrayBufferView) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (controller._closeRequested || stream._state !== 'readable') {\n    return;\n  }\n\n  const buffer = chunk.buffer;\n  const byteOffset = chunk.byteOffset;\n  const byteLength = chunk.byteLength;\n  if (IsDetachedBuffer(buffer)) {\n    throw new TypeError('chunk\\'s buffer is detached and so cannot be enqueued');\n  }\n  const transferredBuffer = TransferArrayBuffer(buffer);\n\n  if (controller._pendingPullIntos.length > 0) {\n    const firstPendingPullInto = controller._pendingPullIntos.peek();\n    if (IsDetachedBuffer(firstPendingPullInto.buffer)) {\n      throw new TypeError(\n        'The BYOB request\\'s buffer has been detached and so cannot be filled with an enqueued chunk'\n      );\n    }\n    firstPendingPullInto.buffer = TransferArrayBuffer(firstPendingPullInto.buffer);\n  }\n\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n\n  if (ReadableStreamHasDefaultReader(stream)) {\n    if (ReadableStreamGetNumReadRequests(stream) === 0) {\n      assert(controller._pendingPullIntos.length === 0);\n      ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n    } else {\n      assert(controller._queue.length === 0);\n      if (controller._pendingPullIntos.length > 0) {\n        assert(controller._pendingPullIntos.peek().readerType === 'default');\n        ReadableByteStreamControllerShiftPendingPullInto(controller);\n      }\n      const transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength);\n      ReadableStreamFulfillReadRequest(stream, transferredView, false);\n    }\n  } else if (ReadableStreamHasBYOBReader(stream)) {\n    // TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully.\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n    ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n  } else {\n    assert(!IsReadableStreamLocked(stream));\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n  }\n\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nexport function ReadableByteStreamControllerError(controller: ReadableByteStreamController, e: any) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (stream._state !== 'readable') {\n    return;\n  }\n\n  ReadableByteStreamControllerClearPendingPullIntos(controller);\n\n  ResetQueue(controller);\n  ReadableByteStreamControllerClearAlgorithms(controller);\n  ReadableStreamError(stream, e);\n}\n\nexport function ReadableByteStreamControllerGetBYOBRequest(\n  controller: ReadableByteStreamController\n): ReadableStreamBYOBRequest | null {\n  if (controller._byobRequest === null && controller._pendingPullIntos.length > 0) {\n    const firstDescriptor = controller._pendingPullIntos.peek();\n    const view = new Uint8Array(firstDescriptor.buffer,\n                                firstDescriptor.byteOffset + firstDescriptor.bytesFilled,\n                                firstDescriptor.byteLength - firstDescriptor.bytesFilled);\n\n    const byobRequest: ReadableStreamBYOBRequest = Object.create(ReadableStreamBYOBRequest.prototype);\n    SetUpReadableStreamBYOBRequest(byobRequest, controller, view);\n    controller._byobRequest = byobRequest;\n  }\n  return controller._byobRequest;\n}\n\nfunction ReadableByteStreamControllerGetDesiredSize(controller: ReadableByteStreamController): number | null {\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'errored') {\n    return null;\n  }\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\nexport function ReadableByteStreamControllerRespond(controller: ReadableByteStreamController, bytesWritten: number) {\n  assert(controller._pendingPullIntos.length > 0);\n\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'closed') {\n    if (bytesWritten !== 0) {\n      throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream');\n    }\n  } else {\n    assert(state === 'readable');\n    if (bytesWritten === 0) {\n      throw new TypeError('bytesWritten must be greater than 0 when calling respond() on a readable stream');\n    }\n    if (firstDescriptor.bytesFilled + bytesWritten > firstDescriptor.byteLength) {\n      throw new RangeError('bytesWritten out of range');\n    }\n  }\n\n  firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer);\n\n  ReadableByteStreamControllerRespondInternal(controller, bytesWritten);\n}\n\nexport function ReadableByteStreamControllerRespondWithNewView(controller: ReadableByteStreamController,\n                                                               view: ArrayBufferView) {\n  assert(controller._pendingPullIntos.length > 0);\n  assert(!IsDetachedBuffer(view.buffer));\n\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'closed') {\n    if (view.byteLength !== 0) {\n      throw new TypeError('The view\\'s length must be 0 when calling respondWithNewView() on a closed stream');\n    }\n  } else {\n    assert(state === 'readable');\n    if (view.byteLength === 0) {\n      throw new TypeError(\n        'The view\\'s length must be greater than 0 when calling respondWithNewView() on a readable stream'\n      );\n    }\n  }\n\n  if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) {\n    throw new RangeError('The region specified by view does not match byobRequest');\n  }\n  if (firstDescriptor.bufferByteLength !== view.buffer.byteLength) {\n    throw new RangeError('The buffer of view has different capacity than byobRequest');\n  }\n  if (firstDescriptor.bytesFilled + view.byteLength > firstDescriptor.byteLength) {\n    throw new RangeError('The region specified by view is larger than byobRequest');\n  }\n\n  const viewByteLength = view.byteLength;\n  firstDescriptor.buffer = TransferArrayBuffer(view.buffer);\n  ReadableByteStreamControllerRespondInternal(controller, viewByteLength);\n}\n\nexport function SetUpReadableByteStreamController(stream: ReadableByteStream,\n                                                  controller: ReadableByteStreamController,\n                                                  startAlgorithm: () => void | PromiseLike<void>,\n                                                  pullAlgorithm: () => Promise<void>,\n                                                  cancelAlgorithm: (reason: any) => Promise<void>,\n                                                  highWaterMark: number,\n                                                  autoAllocateChunkSize: number | undefined) {\n  assert(stream._readableStreamController === undefined);\n  if (autoAllocateChunkSize !== undefined) {\n    assert(NumberIsInteger(autoAllocateChunkSize));\n    assert(autoAllocateChunkSize > 0);\n  }\n\n  controller._controlledReadableByteStream = stream;\n\n  controller._pullAgain = false;\n  controller._pulling = false;\n\n  controller._byobRequest = null;\n\n  // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n  controller._queue = controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._closeRequested = false;\n  controller._started = false;\n\n  controller._strategyHWM = highWaterMark;\n\n  controller._pullAlgorithm = pullAlgorithm;\n  controller._cancelAlgorithm = cancelAlgorithm;\n\n  controller._autoAllocateChunkSize = autoAllocateChunkSize;\n\n  controller._pendingPullIntos = new SimpleQueue();\n\n  stream._readableStreamController = controller;\n\n  const startResult = startAlgorithm();\n  uponPromise(\n    promiseResolvedWith(startResult),\n    () => {\n      controller._started = true;\n\n      assert(!controller._pulling);\n      assert(!controller._pullAgain);\n\n      ReadableByteStreamControllerCallPullIfNeeded(controller);\n    },\n    r => {\n      ReadableByteStreamControllerError(controller, r);\n    }\n  );\n}\n\nexport function SetUpReadableByteStreamControllerFromUnderlyingSource(\n  stream: ReadableByteStream,\n  underlyingByteSource: ValidatedUnderlyingByteSource,\n  highWaterMark: number\n) {\n  const controller: ReadableByteStreamController = Object.create(ReadableByteStreamController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let pullAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let cancelAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingByteSource.start !== undefined) {\n    startAlgorithm = () => underlyingByteSource.start!(controller);\n  }\n  if (underlyingByteSource.pull !== undefined) {\n    pullAlgorithm = () => underlyingByteSource.pull!(controller);\n  }\n  if (underlyingByteSource.cancel !== undefined) {\n    cancelAlgorithm = reason => underlyingByteSource.cancel!(reason);\n  }\n\n  const autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;\n  if (autoAllocateChunkSize === 0) {\n    throw new TypeError('autoAllocateChunkSize must be greater than 0');\n  }\n\n  SetUpReadableByteStreamController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize\n  );\n}\n\nfunction SetUpReadableStreamBYOBRequest(request: ReadableStreamBYOBRequest,\n                                        controller: ReadableByteStreamController,\n                                        view: ArrayBufferView) {\n  assert(IsReadableByteStreamController(controller));\n  assert(typeof view === 'object');\n  assert(ArrayBuffer.isView(view));\n  assert(!IsDetachedBuffer(view.buffer));\n  request._associatedReadableByteStreamController = controller;\n  request._view = view;\n}\n\n// Helper functions for the ReadableStreamBYOBRequest.\n\nfunction byobRequestBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamBYOBRequest.prototype.${name} can only be used on a ReadableStreamBYOBRequest`);\n}\n\n// Helper functions for the ReadableByteStreamController.\n\nfunction byteStreamControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableByteStreamController.prototype.${name} can only be used on a ReadableByteStreamController`);\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericInitialize,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport { IsReadableStreamLocked, ReadableByteStream, ReadableStream } from '../readable-stream';\nimport {\n  IsReadableByteStreamController,\n  ReadableByteStreamController,\n  ReadableByteStreamControllerPullInto\n} from './byte-stream-controller';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { newPromise, promiseRejectedWith } from '../helpers/webidl';\nimport { assertRequiredArgument } from '../validators/basic';\nimport { assertReadableStream } from '../validators/readable-stream';\nimport { IsDetachedBuffer } from '../abstract-ops/ecmascript';\n\n/**\n * A result returned by {@link ReadableStreamBYOBReader.read}.\n *\n * @public\n */\nexport type ReadableStreamBYOBReadResult<T extends ArrayBufferView> = {\n  done: false;\n  value: T;\n} | {\n  done: true;\n  value: T | undefined;\n};\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamBYOBReader(stream: ReadableByteStream): ReadableStreamBYOBReader {\n  return new ReadableStreamBYOBReader(stream);\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamAddReadIntoRequest<T extends ArrayBufferView>(stream: ReadableByteStream,\n                                                                            readIntoRequest: ReadIntoRequest<T>): void {\n  assert(IsReadableStreamBYOBReader(stream._reader));\n  assert(stream._state === 'readable' || stream._state === 'closed');\n\n  (stream._reader! as ReadableStreamBYOBReader)._readIntoRequests.push(readIntoRequest);\n}\n\nexport function ReadableStreamFulfillReadIntoRequest(stream: ReadableByteStream,\n                                                     chunk: ArrayBufferView,\n                                                     done: boolean) {\n  const reader = stream._reader as ReadableStreamBYOBReader;\n\n  assert(reader._readIntoRequests.length > 0);\n\n  const readIntoRequest = reader._readIntoRequests.shift()!;\n  if (done) {\n    readIntoRequest._closeSteps(chunk);\n  } else {\n    readIntoRequest._chunkSteps(chunk);\n  }\n}\n\nexport function ReadableStreamGetNumReadIntoRequests(stream: ReadableByteStream): number {\n  return (stream._reader as ReadableStreamBYOBReader)._readIntoRequests.length;\n}\n\nexport function ReadableStreamHasBYOBReader(stream: ReadableByteStream): boolean {\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return false;\n  }\n\n  if (!IsReadableStreamBYOBReader(reader)) {\n    return false;\n  }\n\n  return true;\n}\n\n// Readers\n\nexport interface ReadIntoRequest<T extends ArrayBufferView> {\n  _chunkSteps(chunk: T): void;\n\n  _closeSteps(chunk: T | undefined): void;\n\n  _errorSteps(e: any): void;\n}\n\n/**\n * A BYOB reader vended by a {@link ReadableStream}.\n *\n * @public\n */\nexport class ReadableStreamBYOBReader {\n  /** @internal */\n  _ownerReadableStream!: ReadableByteStream;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readIntoRequests: SimpleQueue<ReadIntoRequest<any>>;\n\n  constructor(stream: ReadableByteStream) {\n    assertRequiredArgument(stream, 1, 'ReadableStreamBYOBReader');\n    assertReadableStream(stream, 'First parameter');\n\n    if (IsReadableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n    }\n\n    if (!IsReadableByteStreamController(stream._readableStreamController)) {\n      throw new TypeError('Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte ' +\n        'source');\n    }\n\n    ReadableStreamReaderGenericInitialize(this, stream);\n\n    this._readIntoRequests = new SimpleQueue();\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or\n   * the reader's lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('cancel'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('cancel'));\n    }\n\n    return ReadableStreamReaderGenericCancel(this, reason);\n  }\n\n  /**\n   * Attempts to reads bytes into view, and returns a promise resolved with the result.\n   *\n   * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.\n   */\n  read<T extends ArrayBufferView>(view: T): Promise<ReadableStreamBYOBReadResult<T>> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('read'));\n    }\n\n    if (!ArrayBuffer.isView(view)) {\n      return promiseRejectedWith(new TypeError('view must be an array buffer view'));\n    }\n    if (view.byteLength === 0) {\n      return promiseRejectedWith(new TypeError('view must have non-zero byteLength'));\n    }\n    if (view.buffer.byteLength === 0) {\n      return promiseRejectedWith(new TypeError(`view's buffer must have non-zero byteLength`));\n    }\n    if (IsDetachedBuffer(view.buffer)) {\n      return promiseRejectedWith(new TypeError('view\\'s buffer has been detached'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('read from'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamBYOBReadResult<T>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamBYOBReadResult<T>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readIntoRequest: ReadIntoRequest<T> = {\n      _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),\n      _closeSteps: chunk => resolvePromise({ value: chunk, done: true }),\n      _errorSteps: e => rejectPromise(e)\n    };\n    ReadableStreamBYOBReaderRead(this, view, readIntoRequest);\n    return promise;\n  }\n\n  /**\n   * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.\n   * If the associated stream is errored when the lock is released, the reader will appear errored in the same way\n   * from now on; otherwise, the reader will appear closed.\n   *\n   * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by\n   * the reader's {@link ReadableStreamBYOBReader.read | read()} method has not yet been settled. Attempting to\n   * do so will throw a `TypeError` and leave the reader locked to the stream.\n   */\n  releaseLock(): void {\n    if (!IsReadableStreamBYOBReader(this)) {\n      throw byobReaderBrandCheckException('releaseLock');\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return;\n    }\n\n    if (this._readIntoRequests.length > 0) {\n      throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n    }\n\n    ReadableStreamReaderGenericRelease(this);\n  }\n}\n\nObject.defineProperties(ReadableStreamBYOBReader.prototype, {\n  cancel: { enumerable: true },\n  read: { enumerable: true },\n  releaseLock: { enumerable: true },\n  closed: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamBYOBReader.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamBYOBReader',\n    configurable: true\n  });\n}\n\n// Abstract operations for the readers.\n\nexport function IsReadableStreamBYOBReader(x: any): x is ReadableStreamBYOBReader {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readIntoRequests')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamBYOBReader;\n}\n\nexport function ReadableStreamBYOBReaderRead<T extends ArrayBufferView>(\n  reader: ReadableStreamBYOBReader,\n  view: T,\n  readIntoRequest: ReadIntoRequest<T>\n): void {\n  const stream = reader._ownerReadableStream;\n\n  assert(stream !== undefined);\n\n  stream._disturbed = true;\n\n  if (stream._state === 'errored') {\n    readIntoRequest._errorSteps(stream._storedError);\n  } else {\n    ReadableByteStreamControllerPullInto(\n      stream._readableStreamController as ReadableByteStreamController,\n      view,\n      readIntoRequest\n    );\n  }\n}\n\n// Helper functions for the ReadableStreamBYOBReader.\n\nfunction byobReaderBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamBYOBReader.prototype.${name} can only be used on a ReadableStreamBYOBReader`);\n}\n","import { QueuingStrategy, QueuingStrategySizeCallback } from '../queuing-strategy';\nimport NumberIsNaN from '../../stub/number-isnan';\n\nexport function ExtractHighWaterMark(strategy: QueuingStrategy, defaultHWM: number): number {\n  const { highWaterMark } = strategy;\n\n  if (highWaterMark === undefined) {\n    return defaultHWM;\n  }\n\n  if (NumberIsNaN(highWaterMark) || highWaterMark < 0) {\n    throw new RangeError('Invalid highWaterMark');\n  }\n\n  return highWaterMark;\n}\n\nexport function ExtractSizeAlgorithm<T>(strategy: QueuingStrategy<T>): QueuingStrategySizeCallback<T> {\n  const { size } = strategy;\n\n  if (!size) {\n    return () => 1;\n  }\n\n  return size;\n}\n","import { QueuingStrategy, QueuingStrategySizeCallback } from '../queuing-strategy';\nimport { assertDictionary, assertFunction, convertUnrestrictedDouble } from './basic';\n\nexport function convertQueuingStrategy<T>(init: QueuingStrategy<T> | null | undefined,\n                                          context: string): QueuingStrategy<T> {\n  assertDictionary(init, context);\n  const highWaterMark = init?.highWaterMark;\n  const size = init?.size;\n  return {\n    highWaterMark: highWaterMark === undefined ? undefined : convertUnrestrictedDouble(highWaterMark),\n    size: size === undefined ? undefined : convertQueuingStrategySize(size, `${context} has member 'size' that`)\n  };\n}\n\nfunction convertQueuingStrategySize<T>(fn: QueuingStrategySizeCallback<T>,\n                                       context: string): QueuingStrategySizeCallback<T> {\n  assertFunction(fn, context);\n  return chunk => convertUnrestrictedDouble(fn(chunk));\n}\n","import { assertDictionary, assertFunction } from './basic';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\nimport {\n  UnderlyingSink,\n  UnderlyingSinkAbortCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  ValidatedUnderlyingSink\n} from '../writable-stream/underlying-sink';\nimport { WritableStreamDefaultController } from '../writable-stream';\n\nexport function convertUnderlyingSink<W>(original: UnderlyingSink<W> | null,\n                                         context: string): ValidatedUnderlyingSink<W> {\n  assertDictionary(original, context);\n  const abort = original?.abort;\n  const close = original?.close;\n  const start = original?.start;\n  const type = original?.type;\n  const write = original?.write;\n  return {\n    abort: abort === undefined ?\n      undefined :\n      convertUnderlyingSinkAbortCallback(abort, original!, `${context} has member 'abort' that`),\n    close: close === undefined ?\n      undefined :\n      convertUnderlyingSinkCloseCallback(close, original!, `${context} has member 'close' that`),\n    start: start === undefined ?\n      undefined :\n      convertUnderlyingSinkStartCallback(start, original!, `${context} has member 'start' that`),\n    write: write === undefined ?\n      undefined :\n      convertUnderlyingSinkWriteCallback(write, original!, `${context} has member 'write' that`),\n    type\n  };\n}\n\nfunction convertUnderlyingSinkAbortCallback(\n  fn: UnderlyingSinkAbortCallback,\n  original: UnderlyingSink,\n  context: string\n): (reason: any) => Promise<void> {\n  assertFunction(fn, context);\n  return (reason: any) => promiseCall(fn, original, [reason]);\n}\n\nfunction convertUnderlyingSinkCloseCallback(\n  fn: UnderlyingSinkCloseCallback,\n  original: UnderlyingSink,\n  context: string\n): () => Promise<void> {\n  assertFunction(fn, context);\n  return () => promiseCall(fn, original, []);\n}\n\nfunction convertUnderlyingSinkStartCallback(\n  fn: UnderlyingSinkStartCallback,\n  original: UnderlyingSink,\n  context: string\n): UnderlyingSinkStartCallback {\n  assertFunction(fn, context);\n  return (controller: WritableStreamDefaultController) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertUnderlyingSinkWriteCallback<W>(\n  fn: UnderlyingSinkWriteCallback<W>,\n  original: UnderlyingSink<W>,\n  context: string\n): (chunk: W, controller: WritableStreamDefaultController) => Promise<void> {\n  assertFunction(fn, context);\n  return (chunk: W, controller: WritableStreamDefaultController) => promiseCall(fn, original, [chunk, controller]);\n}\n","import { IsWritableStream, WritableStream } from '../writable-stream';\n\nexport function assertWritableStream(x: unknown, context: string): asserts x is WritableStream {\n  if (!IsWritableStream(x)) {\n    throw new TypeError(`${context} is not a WritableStream.`);\n  }\n}\n","/**\n * A signal object that allows you to communicate with a request and abort it if required\n * via its associated `AbortController` object.\n *\n * @remarks\n *   This interface is compatible with the `AbortSignal` interface defined in TypeScript's DOM types.\n *   It is redefined here, so it can be polyfilled without a DOM, for example with\n *   {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.\n *\n * @public\n */\nexport interface AbortSignal {\n  /**\n   * Whether the request is aborted.\n   */\n  readonly aborted: boolean;\n\n  /**\n   * Add an event listener to be triggered when this signal becomes aborted.\n   */\n  addEventListener(type: 'abort', listener: () => void): void;\n\n  /**\n   * Remove an event listener that was previously added with {@link AbortSignal.addEventListener}.\n   */\n  removeEventListener(type: 'abort', listener: () => void): void;\n}\n\nexport function isAbortSignal(value: unknown): value is AbortSignal {\n  if (typeof value !== 'object' || value === null) {\n    return false;\n  }\n  try {\n    return typeof (value as AbortSignal).aborted === 'boolean';\n  } catch {\n    // AbortSignal.prototype.aborted throws if its brand check fails\n    return false;\n  }\n}\n\n/**\n * A controller object that allows you to abort an `AbortSignal` when desired.\n *\n * @remarks\n *   This interface is compatible with the `AbortController` interface defined in TypeScript's DOM types.\n *   It is redefined here, so it can be polyfilled without a DOM, for example with\n *   {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.\n *\n * @internal\n */\nexport interface AbortController {\n  readonly signal: AbortSignal;\n\n  abort(): void;\n}\n\ninterface AbortControllerConstructor {\n  new(): AbortController;\n}\n\nconst supportsAbortController = typeof (AbortController as any) === 'function';\n\n/**\n * Construct a new AbortController, if supported by the platform.\n *\n * @internal\n */\nexport function createAbortController(): AbortController | undefined {\n  if (supportsAbortController) {\n    return new (AbortController as AbortControllerConstructor)();\n  }\n  return undefined;\n}\n","import assert from '../stub/assert';\nimport {\n  newPromise,\n  promiseRejectedWith,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  uponPromise\n} from './helpers/webidl';\nimport {\n  DequeueValue,\n  EnqueueValueWithSize,\n  PeekQueueValue,\n  QueuePair,\n  ResetQueue\n} from './abstract-ops/queue-with-sizes';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { SimpleQueue } from './simple-queue';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { AbortSteps, ErrorSteps } from './abstract-ops/internal-methods';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport {\n  UnderlyingSink,\n  UnderlyingSinkAbortCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  ValidatedUnderlyingSink\n} from './writable-stream/underlying-sink';\nimport { assertObject, assertRequiredArgument } from './validators/basic';\nimport { convertUnderlyingSink } from './validators/underlying-sink';\nimport { assertWritableStream } from './validators/writable-stream';\nimport { AbortController, AbortSignal, createAbortController } from './abort-signal';\n\ntype WritableStreamState = 'writable' | 'closed' | 'erroring' | 'errored';\n\ninterface WriteOrCloseRequest {\n  _resolve: (value?: undefined) => void;\n  _reject: (reason: any) => void;\n}\n\ntype WriteRequest = WriteOrCloseRequest;\ntype CloseRequest = WriteOrCloseRequest;\n\ninterface PendingAbortRequest {\n  _promise: Promise<undefined>;\n  _resolve: (value?: undefined) => void;\n  _reject: (reason: any) => void;\n  _reason: any;\n  _wasAlreadyErroring: boolean;\n}\n\n/**\n * A writable stream represents a destination for data, into which you can write.\n *\n * @public\n */\nclass WritableStream<W = any> {\n  /** @internal */\n  _state!: WritableStreamState;\n  /** @internal */\n  _storedError: any;\n  /** @internal */\n  _writer: WritableStreamDefaultWriter<W> | undefined;\n  /** @internal */\n  _writableStreamController!: WritableStreamDefaultController<W>;\n  /** @internal */\n  _writeRequests!: SimpleQueue<WriteRequest>;\n  /** @internal */\n  _inFlightWriteRequest: WriteRequest | undefined;\n  /** @internal */\n  _closeRequest: CloseRequest | undefined;\n  /** @internal */\n  _inFlightCloseRequest: CloseRequest | undefined;\n  /** @internal */\n  _pendingAbortRequest: PendingAbortRequest | undefined;\n  /** @internal */\n  _backpressure!: boolean;\n\n  constructor(underlyingSink?: UnderlyingSink<W>, strategy?: QueuingStrategy<W>);\n  constructor(rawUnderlyingSink: UnderlyingSink<W> | null | undefined = {},\n              rawStrategy: QueuingStrategy<W> | null | undefined = {}) {\n    if (rawUnderlyingSink === undefined) {\n      rawUnderlyingSink = null;\n    } else {\n      assertObject(rawUnderlyingSink, 'First parameter');\n    }\n\n    const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');\n    const underlyingSink = convertUnderlyingSink(rawUnderlyingSink, 'First parameter');\n\n    InitializeWritableStream(this);\n\n    const type = underlyingSink.type;\n    if (type !== undefined) {\n      throw new RangeError('Invalid type is specified');\n    }\n\n    const sizeAlgorithm = ExtractSizeAlgorithm(strategy);\n    const highWaterMark = ExtractHighWaterMark(strategy, 1);\n\n    SetUpWritableStreamDefaultControllerFromUnderlyingSink(this, underlyingSink, highWaterMark, sizeAlgorithm);\n  }\n\n  /**\n   * Returns whether or not the writable stream is locked to a writer.\n   */\n  get locked(): boolean {\n    if (!IsWritableStream(this)) {\n      throw streamBrandCheckException('locked');\n    }\n\n    return IsWritableStreamLocked(this);\n  }\n\n  /**\n   * Aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be\n   * immediately moved to an errored state, with any queued-up writes discarded. This will also execute any abort\n   * mechanism of the underlying sink.\n   *\n   * The returned promise will fulfill if the stream shuts down successfully, or reject if the underlying sink signaled\n   * that there was an error doing so. Additionally, it will reject with a `TypeError` (without attempting to cancel\n   * the stream) if the stream is currently locked.\n   */\n  abort(reason: any = undefined): Promise<void> {\n    if (!IsWritableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('abort'));\n    }\n\n    if (IsWritableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot abort a stream that already has a writer'));\n    }\n\n    return WritableStreamAbort(this, reason);\n  }\n\n  /**\n   * Closes the stream. The underlying sink will finish processing any previously-written chunks, before invoking its\n   * close behavior. During this time any further attempts to write will fail (without erroring the stream).\n   *\n   * The method returns a promise that will fulfill if all remaining chunks are successfully written and the stream\n   * successfully closes, or rejects if an error is encountered during this process. Additionally, it will reject with\n   * a `TypeError` (without attempting to cancel the stream) if the stream is currently locked.\n   */\n  close() {\n    if (!IsWritableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('close'));\n    }\n\n    if (IsWritableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot close a stream that already has a writer'));\n    }\n\n    if (WritableStreamCloseQueuedOrInFlight(this)) {\n      return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));\n    }\n\n    return WritableStreamClose(this);\n  }\n\n  /**\n   * Creates a {@link WritableStreamDefaultWriter | writer} and locks the stream to the new writer. While the stream\n   * is locked, no other writer can be acquired until this one is released.\n   *\n   * This functionality is especially useful for creating abstractions that desire the ability to write to a stream\n   * without interruption or interleaving. By getting a writer for the stream, you can ensure nobody else can write at\n   * the same time, which would cause the resulting written data to be unpredictable and probably useless.\n   */\n  getWriter(): WritableStreamDefaultWriter<W> {\n    if (!IsWritableStream(this)) {\n      throw streamBrandCheckException('getWriter');\n    }\n\n    return AcquireWritableStreamDefaultWriter(this);\n  }\n}\n\nObject.defineProperties(WritableStream.prototype, {\n  abort: { enumerable: true },\n  close: { enumerable: true },\n  getWriter: { enumerable: true },\n  locked: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStream.prototype, Symbol.toStringTag, {\n    value: 'WritableStream',\n    configurable: true\n  });\n}\n\nexport {\n  AcquireWritableStreamDefaultWriter,\n  CreateWritableStream,\n  IsWritableStream,\n  IsWritableStreamLocked,\n  WritableStream,\n  WritableStreamAbort,\n  WritableStreamDefaultControllerErrorIfNeeded,\n  WritableStreamDefaultWriterCloseWithErrorPropagation,\n  WritableStreamDefaultWriterRelease,\n  WritableStreamDefaultWriterWrite,\n  WritableStreamCloseQueuedOrInFlight,\n  UnderlyingSink,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkAbortCallback\n};\n\n// Abstract operations for the WritableStream.\n\nfunction AcquireWritableStreamDefaultWriter<W>(stream: WritableStream<W>): WritableStreamDefaultWriter<W> {\n  return new WritableStreamDefaultWriter(stream);\n}\n\n// Throws if and only if startAlgorithm throws.\nfunction CreateWritableStream<W>(startAlgorithm: () => void | PromiseLike<void>,\n                                 writeAlgorithm: (chunk: W) => Promise<void>,\n                                 closeAlgorithm: () => Promise<void>,\n                                 abortAlgorithm: (reason: any) => Promise<void>,\n                                 highWaterMark = 1,\n                                 sizeAlgorithm: QueuingStrategySizeCallback<W> = () => 1) {\n  assert(IsNonNegativeNumber(highWaterMark));\n\n  const stream: WritableStream<W> = Object.create(WritableStream.prototype);\n  InitializeWritableStream(stream);\n\n  const controller: WritableStreamDefaultController<W> = Object.create(WritableStreamDefaultController.prototype);\n\n  SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm,\n                                       abortAlgorithm, highWaterMark, sizeAlgorithm);\n  return stream;\n}\n\nfunction InitializeWritableStream<W>(stream: WritableStream<W>) {\n  stream._state = 'writable';\n\n  // The error that will be reported by new method calls once the state becomes errored. Only set when [[state]] is\n  // 'erroring' or 'errored'. May be set to an undefined value.\n  stream._storedError = undefined;\n\n  stream._writer = undefined;\n\n  // Initialize to undefined first because the constructor of the controller checks this\n  // variable to validate the caller.\n  stream._writableStreamController = undefined!;\n\n  // This queue is placed here instead of the writer class in order to allow for passing a writer to the next data\n  // producer without waiting for the queued writes to finish.\n  stream._writeRequests = new SimpleQueue();\n\n  // Write requests are removed from _writeRequests when write() is called on the underlying sink. This prevents\n  // them from being erroneously rejected on error. If a write() call is in-flight, the request is stored here.\n  stream._inFlightWriteRequest = undefined;\n\n  // The promise that was returned from writer.close(). Stored here because it may be fulfilled after the writer\n  // has been detached.\n  stream._closeRequest = undefined;\n\n  // Close request is removed from _closeRequest when close() is called on the underlying sink. This prevents it\n  // from being erroneously rejected on error. If a close() call is in-flight, the request is stored here.\n  stream._inFlightCloseRequest = undefined;\n\n  // The promise that was returned from writer.abort(). This may also be fulfilled after the writer has detached.\n  stream._pendingAbortRequest = undefined;\n\n  // The backpressure signal set by the controller.\n  stream._backpressure = false;\n}\n\nfunction IsWritableStream(x: unknown): x is WritableStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_writableStreamController')) {\n    return false;\n  }\n\n  return x instanceof WritableStream;\n}\n\nfunction IsWritableStreamLocked(stream: WritableStream): boolean {\n  assert(IsWritableStream(stream));\n\n  if (stream._writer === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamAbort(stream: WritableStream, reason: any): Promise<undefined> {\n  if (stream._state === 'closed' || stream._state === 'errored') {\n    return promiseResolvedWith(undefined);\n  }\n  stream._writableStreamController._abortReason = reason;\n  stream._writableStreamController._abortController?.abort();\n\n  // TypeScript narrows the type of `stream._state` down to 'writable' | 'erroring',\n  // but it doesn't know that signaling abort runs author code that might have changed the state.\n  // Widen the type again by casting to WritableStreamState.\n  const state = stream._state as WritableStreamState;\n\n  if (state === 'closed' || state === 'errored') {\n    return promiseResolvedWith(undefined);\n  }\n  if (stream._pendingAbortRequest !== undefined) {\n    return stream._pendingAbortRequest._promise;\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n\n  let wasAlreadyErroring = false;\n  if (state === 'erroring') {\n    wasAlreadyErroring = true;\n    // reason will not be used, so don't keep a reference to it.\n    reason = undefined;\n  }\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    stream._pendingAbortRequest = {\n      _promise: undefined!,\n      _resolve: resolve,\n      _reject: reject,\n      _reason: reason,\n      _wasAlreadyErroring: wasAlreadyErroring\n    };\n  });\n  stream._pendingAbortRequest!._promise = promise;\n\n  if (!wasAlreadyErroring) {\n    WritableStreamStartErroring(stream, reason);\n  }\n\n  return promise;\n}\n\nfunction WritableStreamClose(stream: WritableStream<any>): Promise<undefined> {\n  const state = stream._state;\n  if (state === 'closed' || state === 'errored') {\n    return promiseRejectedWith(new TypeError(\n      `The stream (in ${state} state) is not in the writable state and cannot be closed`));\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n  assert(!WritableStreamCloseQueuedOrInFlight(stream));\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    const closeRequest: CloseRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._closeRequest = closeRequest;\n  });\n\n  const writer = stream._writer;\n  if (writer !== undefined && stream._backpressure && state === 'writable') {\n    defaultWriterReadyPromiseResolve(writer);\n  }\n\n  WritableStreamDefaultControllerClose(stream._writableStreamController);\n\n  return promise;\n}\n\n// WritableStream API exposed for controllers.\n\nfunction WritableStreamAddWriteRequest(stream: WritableStream): Promise<undefined> {\n  assert(IsWritableStreamLocked(stream));\n  assert(stream._state === 'writable');\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    const writeRequest: WriteRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._writeRequests.push(writeRequest);\n  });\n\n  return promise;\n}\n\nfunction WritableStreamDealWithRejection(stream: WritableStream, error: any) {\n  const state = stream._state;\n\n  if (state === 'writable') {\n    WritableStreamStartErroring(stream, error);\n    return;\n  }\n\n  assert(state === 'erroring');\n  WritableStreamFinishErroring(stream);\n}\n\nfunction WritableStreamStartErroring(stream: WritableStream, reason: any) {\n  assert(stream._storedError === undefined);\n  assert(stream._state === 'writable');\n\n  const controller = stream._writableStreamController;\n  assert(controller !== undefined);\n\n  stream._state = 'erroring';\n  stream._storedError = reason;\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);\n  }\n\n  if (!WritableStreamHasOperationMarkedInFlight(stream) && controller._started) {\n    WritableStreamFinishErroring(stream);\n  }\n}\n\nfunction WritableStreamFinishErroring(stream: WritableStream) {\n  assert(stream._state === 'erroring');\n  assert(!WritableStreamHasOperationMarkedInFlight(stream));\n  stream._state = 'errored';\n  stream._writableStreamController[ErrorSteps]();\n\n  const storedError = stream._storedError;\n  stream._writeRequests.forEach(writeRequest => {\n    writeRequest._reject(storedError);\n  });\n  stream._writeRequests = new SimpleQueue();\n\n  if (stream._pendingAbortRequest === undefined) {\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    return;\n  }\n\n  const abortRequest = stream._pendingAbortRequest;\n  stream._pendingAbortRequest = undefined;\n\n  if (abortRequest._wasAlreadyErroring) {\n    abortRequest._reject(storedError);\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    return;\n  }\n\n  const promise = stream._writableStreamController[AbortSteps](abortRequest._reason);\n  uponPromise(\n    promise,\n    () => {\n      abortRequest._resolve();\n      WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    },\n    (reason: any) => {\n      abortRequest._reject(reason);\n      WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    });\n}\n\nfunction WritableStreamFinishInFlightWrite(stream: WritableStream) {\n  assert(stream._inFlightWriteRequest !== undefined);\n  stream._inFlightWriteRequest!._resolve(undefined);\n  stream._inFlightWriteRequest = undefined;\n}\n\nfunction WritableStreamFinishInFlightWriteWithError(stream: WritableStream, error: any) {\n  assert(stream._inFlightWriteRequest !== undefined);\n  stream._inFlightWriteRequest!._reject(error);\n  stream._inFlightWriteRequest = undefined;\n\n  assert(stream._state === 'writable' || stream._state === 'erroring');\n\n  WritableStreamDealWithRejection(stream, error);\n}\n\nfunction WritableStreamFinishInFlightClose(stream: WritableStream) {\n  assert(stream._inFlightCloseRequest !== undefined);\n  stream._inFlightCloseRequest!._resolve(undefined);\n  stream._inFlightCloseRequest = undefined;\n\n  const state = stream._state;\n\n  assert(state === 'writable' || state === 'erroring');\n\n  if (state === 'erroring') {\n    // The error was too late to do anything, so it is ignored.\n    stream._storedError = undefined;\n    if (stream._pendingAbortRequest !== undefined) {\n      stream._pendingAbortRequest._resolve();\n      stream._pendingAbortRequest = undefined;\n    }\n  }\n\n  stream._state = 'closed';\n\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    defaultWriterClosedPromiseResolve(writer);\n  }\n\n  assert(stream._pendingAbortRequest === undefined);\n  assert(stream._storedError === undefined);\n}\n\nfunction WritableStreamFinishInFlightCloseWithError(stream: WritableStream, error: any) {\n  assert(stream._inFlightCloseRequest !== undefined);\n  stream._inFlightCloseRequest!._reject(error);\n  stream._inFlightCloseRequest = undefined;\n\n  assert(stream._state === 'writable' || stream._state === 'erroring');\n\n  // Never execute sink abort() after sink close().\n  if (stream._pendingAbortRequest !== undefined) {\n    stream._pendingAbortRequest._reject(error);\n    stream._pendingAbortRequest = undefined;\n  }\n  WritableStreamDealWithRejection(stream, error);\n}\n\n// TODO(ricea): Fix alphabetical order.\nfunction WritableStreamCloseQueuedOrInFlight(stream: WritableStream): boolean {\n  if (stream._closeRequest === undefined && stream._inFlightCloseRequest === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamHasOperationMarkedInFlight(stream: WritableStream): boolean {\n  if (stream._inFlightWriteRequest === undefined && stream._inFlightCloseRequest === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamMarkCloseRequestInFlight(stream: WritableStream) {\n  assert(stream._inFlightCloseRequest === undefined);\n  assert(stream._closeRequest !== undefined);\n  stream._inFlightCloseRequest = stream._closeRequest;\n  stream._closeRequest = undefined;\n}\n\nfunction WritableStreamMarkFirstWriteRequestInFlight(stream: WritableStream) {\n  assert(stream._inFlightWriteRequest === undefined);\n  assert(stream._writeRequests.length !== 0);\n  stream._inFlightWriteRequest = stream._writeRequests.shift();\n}\n\nfunction WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream: WritableStream) {\n  assert(stream._state === 'errored');\n  if (stream._closeRequest !== undefined) {\n    assert(stream._inFlightCloseRequest === undefined);\n\n    stream._closeRequest._reject(stream._storedError);\n    stream._closeRequest = undefined;\n  }\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    defaultWriterClosedPromiseReject(writer, stream._storedError);\n  }\n}\n\nfunction WritableStreamUpdateBackpressure(stream: WritableStream, backpressure: boolean) {\n  assert(stream._state === 'writable');\n  assert(!WritableStreamCloseQueuedOrInFlight(stream));\n\n  const writer = stream._writer;\n  if (writer !== undefined && backpressure !== stream._backpressure) {\n    if (backpressure) {\n      defaultWriterReadyPromiseReset(writer);\n    } else {\n      assert(!backpressure);\n\n      defaultWriterReadyPromiseResolve(writer);\n    }\n  }\n\n  stream._backpressure = backpressure;\n}\n\n/**\n * A default writer vended by a {@link WritableStream}.\n *\n * @public\n */\nexport class WritableStreamDefaultWriter<W = any> {\n  /** @internal */\n  _ownerWritableStream: WritableStream<W>;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _closedPromiseState!: 'pending' | 'resolved' | 'rejected';\n  /** @internal */\n  _readyPromise!: Promise<undefined>;\n  /** @internal */\n  _readyPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _readyPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readyPromiseState!: 'pending' | 'fulfilled' | 'rejected';\n\n  constructor(stream: WritableStream<W>) {\n    assertRequiredArgument(stream, 1, 'WritableStreamDefaultWriter');\n    assertWritableStream(stream, 'First parameter');\n\n    if (IsWritableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive writing by another writer');\n    }\n\n    this._ownerWritableStream = stream;\n    stream._writer = this;\n\n    const state = stream._state;\n\n    if (state === 'writable') {\n      if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._backpressure) {\n        defaultWriterReadyPromiseInitialize(this);\n      } else {\n        defaultWriterReadyPromiseInitializeAsResolved(this);\n      }\n\n      defaultWriterClosedPromiseInitialize(this);\n    } else if (state === 'erroring') {\n      defaultWriterReadyPromiseInitializeAsRejected(this, stream._storedError);\n      defaultWriterClosedPromiseInitialize(this);\n    } else if (state === 'closed') {\n      defaultWriterReadyPromiseInitializeAsResolved(this);\n      defaultWriterClosedPromiseInitializeAsResolved(this);\n    } else {\n      assert(state === 'errored');\n\n      const storedError = stream._storedError;\n      defaultWriterReadyPromiseInitializeAsRejected(this, storedError);\n      defaultWriterClosedPromiseInitializeAsRejected(this, storedError);\n    }\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or\n   * the writer’s lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * Returns the desired size to fill the stream’s internal queue. It can be negative, if the queue is over-full.\n   * A producer can use this information to determine the right amount of data to write.\n   *\n   * It will be `null` if the stream cannot be successfully written to (due to either being errored, or having an abort\n   * queued up). It will return zero if the stream is closed. And the getter will throw an exception if invoked when\n   * the writer’s lock is released.\n   */\n  get desiredSize(): number | null {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      throw defaultWriterBrandCheckException('desiredSize');\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      throw defaultWriterLockException('desiredSize');\n    }\n\n    return WritableStreamDefaultWriterGetDesiredSize(this);\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the desired size to fill the stream’s internal queue transitions\n   * from non-positive to positive, signaling that it is no longer applying backpressure. Once the desired size dips\n   * back to zero or below, the getter will return a new promise that stays pending until the next transition.\n   *\n   * If the stream becomes errored or aborted, or the writer’s lock is released, the returned promise will become\n   * rejected.\n   */\n  get ready(): Promise<undefined> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('ready'));\n    }\n\n    return this._readyPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link WritableStream.abort | stream.abort(reason)}.\n   */\n  abort(reason: any = undefined): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('abort'));\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('abort'));\n    }\n\n    return WritableStreamDefaultWriterAbort(this, reason);\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link WritableStream.close | stream.close()}.\n   */\n  close(): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('close'));\n    }\n\n    const stream = this._ownerWritableStream;\n\n    if (stream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('close'));\n    }\n\n    if (WritableStreamCloseQueuedOrInFlight(stream)) {\n      return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));\n    }\n\n    return WritableStreamDefaultWriterClose(this);\n  }\n\n  /**\n   * Releases the writer’s lock on the corresponding stream. After the lock is released, the writer is no longer active.\n   * If the associated stream is errored when the lock is released, the writer will appear errored in the same way from\n   * now on; otherwise, the writer will appear closed.\n   *\n   * Note that the lock can still be released even if some ongoing writes have not yet finished (i.e. even if the\n   * promises returned from previous calls to {@link WritableStreamDefaultWriter.write | write()} have not yet settled).\n   * It’s not necessary to hold the lock on the writer for the duration of the write; the lock instead simply prevents\n   * other producers from writing in an interleaved manner.\n   */\n  releaseLock(): void {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      throw defaultWriterBrandCheckException('releaseLock');\n    }\n\n    const stream = this._ownerWritableStream;\n\n    if (stream === undefined) {\n      return;\n    }\n\n    assert(stream._writer !== undefined);\n\n    WritableStreamDefaultWriterRelease(this);\n  }\n\n  /**\n   * Writes the given chunk to the writable stream, by waiting until any previous writes have finished successfully,\n   * and then sending the chunk to the underlying sink's {@link UnderlyingSink.write | write()} method. It will return\n   * a promise that fulfills with undefined upon a successful write, or rejects if the write fails or stream becomes\n   * errored before the writing process is initiated.\n   *\n   * Note that what \"success\" means is up to the underlying sink; it might indicate simply that the chunk has been\n   * accepted, and not necessarily that it is safely saved to its ultimate destination.\n   */\n  write(chunk: W): Promise<void>;\n  write(chunk: W = undefined!): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('write'));\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('write to'));\n    }\n\n    return WritableStreamDefaultWriterWrite(this, chunk);\n  }\n}\n\nObject.defineProperties(WritableStreamDefaultWriter.prototype, {\n  abort: { enumerable: true },\n  close: { enumerable: true },\n  releaseLock: { enumerable: true },\n  write: { enumerable: true },\n  closed: { enumerable: true },\n  desiredSize: { enumerable: true },\n  ready: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStreamDefaultWriter.prototype, Symbol.toStringTag, {\n    value: 'WritableStreamDefaultWriter',\n    configurable: true\n  });\n}\n\n// Abstract operations for the WritableStreamDefaultWriter.\n\nfunction IsWritableStreamDefaultWriter<W = any>(x: any): x is WritableStreamDefaultWriter<W> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) {\n    return false;\n  }\n\n  return x instanceof WritableStreamDefaultWriter;\n}\n\n// A client of WritableStreamDefaultWriter may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultWriterAbort(writer: WritableStreamDefaultWriter, reason: any) {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  return WritableStreamAbort(stream, reason);\n}\n\nfunction WritableStreamDefaultWriterClose(writer: WritableStreamDefaultWriter): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  return WritableStreamClose(stream);\n}\n\nfunction WritableStreamDefaultWriterCloseWithErrorPropagation(writer: WritableStreamDefaultWriter): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  const state = stream._state;\n  if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {\n    return promiseResolvedWith(undefined);\n  }\n\n  if (state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n\n  return WritableStreamDefaultWriterClose(writer);\n}\n\nfunction WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer: WritableStreamDefaultWriter, error: any) {\n  if (writer._closedPromiseState === 'pending') {\n    defaultWriterClosedPromiseReject(writer, error);\n  } else {\n    defaultWriterClosedPromiseResetToRejected(writer, error);\n  }\n}\n\nfunction WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer: WritableStreamDefaultWriter, error: any) {\n  if (writer._readyPromiseState === 'pending') {\n    defaultWriterReadyPromiseReject(writer, error);\n  } else {\n    defaultWriterReadyPromiseResetToRejected(writer, error);\n  }\n}\n\nfunction WritableStreamDefaultWriterGetDesiredSize(writer: WritableStreamDefaultWriter): number | null {\n  const stream = writer._ownerWritableStream;\n  const state = stream._state;\n\n  if (state === 'errored' || state === 'erroring') {\n    return null;\n  }\n\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return WritableStreamDefaultControllerGetDesiredSize(stream._writableStreamController);\n}\n\nfunction WritableStreamDefaultWriterRelease(writer: WritableStreamDefaultWriter) {\n  const stream = writer._ownerWritableStream;\n  assert(stream !== undefined);\n  assert(stream._writer === writer);\n\n  const releasedError = new TypeError(\n    `Writer was released and can no longer be used to monitor the stream's closedness`);\n\n  WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, releasedError);\n\n  // The state transitions to \"errored\" before the sink abort() method runs, but the writer.closed promise is not\n  // rejected until afterwards. This means that simply testing state will not work.\n  WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, releasedError);\n\n  stream._writer = undefined;\n  writer._ownerWritableStream = undefined!;\n}\n\nfunction WritableStreamDefaultWriterWrite<W>(writer: WritableStreamDefaultWriter<W>, chunk: W): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  const controller = stream._writableStreamController;\n\n  const chunkSize = WritableStreamDefaultControllerGetChunkSize(controller, chunk);\n\n  if (stream !== writer._ownerWritableStream) {\n    return promiseRejectedWith(defaultWriterLockException('write to'));\n  }\n\n  const state = stream._state;\n  if (state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n  if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {\n    return promiseRejectedWith(new TypeError('The stream is closing or closed and cannot be written to'));\n  }\n  if (state === 'erroring') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  assert(state === 'writable');\n\n  const promise = WritableStreamAddWriteRequest(stream);\n\n  WritableStreamDefaultControllerWrite(controller, chunk, chunkSize);\n\n  return promise;\n}\n\nconst closeSentinel: unique symbol = {} as any;\n\ntype QueueRecord<W> = W | typeof closeSentinel;\n\n/**\n * Allows control of a {@link WritableStream | writable stream}'s state and internal queue.\n *\n * @public\n */\nexport class WritableStreamDefaultController<W = any> {\n  /** @internal */\n  _controlledWritableStream!: WritableStream<W>;\n  /** @internal */\n  _queue!: SimpleQueue<QueuePair<QueueRecord<W>>>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _abortReason: any;\n  /** @internal */\n  _abortController: AbortController | undefined;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _strategySizeAlgorithm!: QueuingStrategySizeCallback<W>;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _writeAlgorithm!: (chunk: W) => Promise<void>;\n  /** @internal */\n  _closeAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _abortAlgorithm!: (reason: any) => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * The reason which was passed to `WritableStream.abort(reason)` when the stream was aborted.\n   *\n   * @deprecated\n   *  This property has been removed from the specification, see https://github.com/whatwg/streams/pull/1177.\n   *  Use {@link WritableStreamDefaultController.signal}'s `reason` instead.\n   */\n  get abortReason(): any {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('abortReason');\n    }\n    return this._abortReason;\n  }\n\n  /**\n   * An `AbortSignal` that can be used to abort the pending write or close operation when the stream is aborted.\n   */\n  get signal(): AbortSignal {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('signal');\n    }\n    if (this._abortController === undefined) {\n      // Older browsers or older Node versions may not support `AbortController` or `AbortSignal`.\n      // We don't want to bundle and ship an `AbortController` polyfill together with our polyfill,\n      // so instead we only implement support for `signal` if we find a global `AbortController` constructor.\n      throw new TypeError('WritableStreamDefaultController.prototype.signal is not supported');\n    }\n    return this._abortController.signal;\n  }\n\n  /**\n   * Closes the controlled writable stream, making all future interactions with it fail with the given error `e`.\n   *\n   * This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying\n   * sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the\n   * normal lifecycle of interactions with the underlying sink.\n   */\n  error(e: any = undefined): void {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n    const state = this._controlledWritableStream._state;\n    if (state !== 'writable') {\n      // The stream is closed, errored or will be soon. The sink can't do anything useful if it gets an error here, so\n      // just treat it as a no-op.\n      return;\n    }\n\n    WritableStreamDefaultControllerError(this, e);\n  }\n\n  /** @internal */\n  [AbortSteps](reason: any): Promise<void> {\n    const result = this._abortAlgorithm(reason);\n    WritableStreamDefaultControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [ErrorSteps]() {\n    ResetQueue(this);\n  }\n}\n\nObject.defineProperties(WritableStreamDefaultController.prototype, {\n  abortReason: { enumerable: true },\n  signal: { enumerable: true },\n  error: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'WritableStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Abstract operations implementing interface required by the WritableStream.\n\nfunction IsWritableStreamDefaultController(x: any): x is WritableStreamDefaultController<any> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledWritableStream')) {\n    return false;\n  }\n\n  return x instanceof WritableStreamDefaultController;\n}\n\nfunction SetUpWritableStreamDefaultController<W>(stream: WritableStream<W>,\n                                                 controller: WritableStreamDefaultController<W>,\n                                                 startAlgorithm: () => void | PromiseLike<void>,\n                                                 writeAlgorithm: (chunk: W) => Promise<void>,\n                                                 closeAlgorithm: () => Promise<void>,\n                                                 abortAlgorithm: (reason: any) => Promise<void>,\n                                                 highWaterMark: number,\n                                                 sizeAlgorithm: QueuingStrategySizeCallback<W>) {\n  assert(IsWritableStream(stream));\n  assert(stream._writableStreamController === undefined);\n\n  controller._controlledWritableStream = stream;\n  stream._writableStreamController = controller;\n\n  // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n  controller._queue = undefined!;\n  controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._abortReason = undefined;\n  controller._abortController = createAbortController();\n  controller._started = false;\n\n  controller._strategySizeAlgorithm = sizeAlgorithm;\n  controller._strategyHWM = highWaterMark;\n\n  controller._writeAlgorithm = writeAlgorithm;\n  controller._closeAlgorithm = closeAlgorithm;\n  controller._abortAlgorithm = abortAlgorithm;\n\n  const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n  WritableStreamUpdateBackpressure(stream, backpressure);\n\n  const startResult = startAlgorithm();\n  const startPromise = promiseResolvedWith(startResult);\n  uponPromise(\n    startPromise,\n    () => {\n      assert(stream._state === 'writable' || stream._state === 'erroring');\n      controller._started = true;\n      WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n    },\n    r => {\n      assert(stream._state === 'writable' || stream._state === 'erroring');\n      controller._started = true;\n      WritableStreamDealWithRejection(stream, r);\n    }\n  );\n}\n\nfunction SetUpWritableStreamDefaultControllerFromUnderlyingSink<W>(stream: WritableStream<W>,\n                                                                   underlyingSink: ValidatedUnderlyingSink<W>,\n                                                                   highWaterMark: number,\n                                                                   sizeAlgorithm: QueuingStrategySizeCallback<W>) {\n  const controller = Object.create(WritableStreamDefaultController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let writeAlgorithm: (chunk: W) => Promise<void> = () => promiseResolvedWith(undefined);\n  let closeAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let abortAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingSink.start !== undefined) {\n    startAlgorithm = () => underlyingSink.start!(controller);\n  }\n  if (underlyingSink.write !== undefined) {\n    writeAlgorithm = chunk => underlyingSink.write!(chunk, controller);\n  }\n  if (underlyingSink.close !== undefined) {\n    closeAlgorithm = () => underlyingSink.close!();\n  }\n  if (underlyingSink.abort !== undefined) {\n    abortAlgorithm = reason => underlyingSink.abort!(reason);\n  }\n\n  SetUpWritableStreamDefaultController(\n    stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm\n  );\n}\n\n// ClearAlgorithms may be called twice. Erroring the same stream in multiple ways will often result in redundant calls.\nfunction WritableStreamDefaultControllerClearAlgorithms(controller: WritableStreamDefaultController<any>) {\n  controller._writeAlgorithm = undefined!;\n  controller._closeAlgorithm = undefined!;\n  controller._abortAlgorithm = undefined!;\n  controller._strategySizeAlgorithm = undefined!;\n}\n\nfunction WritableStreamDefaultControllerClose<W>(controller: WritableStreamDefaultController<W>) {\n  EnqueueValueWithSize(controller, closeSentinel, 0);\n  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\nfunction WritableStreamDefaultControllerGetChunkSize<W>(controller: WritableStreamDefaultController<W>,\n                                                        chunk: W): number {\n  try {\n    return controller._strategySizeAlgorithm(chunk);\n  } catch (chunkSizeE) {\n    WritableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE);\n    return 1;\n  }\n}\n\nfunction WritableStreamDefaultControllerGetDesiredSize(controller: WritableStreamDefaultController<any>): number {\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\nfunction WritableStreamDefaultControllerWrite<W>(controller: WritableStreamDefaultController<W>,\n                                                 chunk: W,\n                                                 chunkSize: number) {\n  try {\n    EnqueueValueWithSize(controller, chunk, chunkSize);\n  } catch (enqueueE) {\n    WritableStreamDefaultControllerErrorIfNeeded(controller, enqueueE);\n    return;\n  }\n\n  const stream = controller._controlledWritableStream;\n  if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._state === 'writable') {\n    const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n    WritableStreamUpdateBackpressure(stream, backpressure);\n  }\n\n  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\n// Abstract operations for the WritableStreamDefaultController.\n\nfunction WritableStreamDefaultControllerAdvanceQueueIfNeeded<W>(controller: WritableStreamDefaultController<W>) {\n  const stream = controller._controlledWritableStream;\n\n  if (!controller._started) {\n    return;\n  }\n\n  if (stream._inFlightWriteRequest !== undefined) {\n    return;\n  }\n\n  const state = stream._state;\n  assert(state !== 'closed' && state !== 'errored');\n  if (state === 'erroring') {\n    WritableStreamFinishErroring(stream);\n    return;\n  }\n\n  if (controller._queue.length === 0) {\n    return;\n  }\n\n  const value = PeekQueueValue(controller);\n  if (value === closeSentinel) {\n    WritableStreamDefaultControllerProcessClose(controller);\n  } else {\n    WritableStreamDefaultControllerProcessWrite(controller, value);\n  }\n}\n\nfunction WritableStreamDefaultControllerErrorIfNeeded(controller: WritableStreamDefaultController<any>, error: any) {\n  if (controller._controlledWritableStream._state === 'writable') {\n    WritableStreamDefaultControllerError(controller, error);\n  }\n}\n\nfunction WritableStreamDefaultControllerProcessClose(controller: WritableStreamDefaultController<any>) {\n  const stream = controller._controlledWritableStream;\n\n  WritableStreamMarkCloseRequestInFlight(stream);\n\n  DequeueValue(controller);\n  assert(controller._queue.length === 0);\n\n  const sinkClosePromise = controller._closeAlgorithm();\n  WritableStreamDefaultControllerClearAlgorithms(controller);\n  uponPromise(\n    sinkClosePromise,\n    () => {\n      WritableStreamFinishInFlightClose(stream);\n    },\n    reason => {\n      WritableStreamFinishInFlightCloseWithError(stream, reason);\n    }\n  );\n}\n\nfunction WritableStreamDefaultControllerProcessWrite<W>(controller: WritableStreamDefaultController<W>, chunk: W) {\n  const stream = controller._controlledWritableStream;\n\n  WritableStreamMarkFirstWriteRequestInFlight(stream);\n\n  const sinkWritePromise = controller._writeAlgorithm(chunk);\n  uponPromise(\n    sinkWritePromise,\n    () => {\n      WritableStreamFinishInFlightWrite(stream);\n\n      const state = stream._state;\n      assert(state === 'writable' || state === 'erroring');\n\n      DequeueValue(controller);\n\n      if (!WritableStreamCloseQueuedOrInFlight(stream) && state === 'writable') {\n        const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n        WritableStreamUpdateBackpressure(stream, backpressure);\n      }\n\n      WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n    },\n    reason => {\n      if (stream._state === 'writable') {\n        WritableStreamDefaultControllerClearAlgorithms(controller);\n      }\n      WritableStreamFinishInFlightWriteWithError(stream, reason);\n    }\n  );\n}\n\nfunction WritableStreamDefaultControllerGetBackpressure(controller: WritableStreamDefaultController<any>): boolean {\n  const desiredSize = WritableStreamDefaultControllerGetDesiredSize(controller);\n  return desiredSize <= 0;\n}\n\n// A client of WritableStreamDefaultController may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultControllerError(controller: WritableStreamDefaultController<any>, error: any) {\n  const stream = controller._controlledWritableStream;\n\n  assert(stream._state === 'writable');\n\n  WritableStreamDefaultControllerClearAlgorithms(controller);\n  WritableStreamStartErroring(stream, error);\n}\n\n// Helper functions for the WritableStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(`WritableStream.prototype.${name} can only be used on a WritableStream`);\n}\n\n// Helper functions for the WritableStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `WritableStreamDefaultController.prototype.${name} can only be used on a WritableStreamDefaultController`);\n}\n\n\n// Helper functions for the WritableStreamDefaultWriter.\n\nfunction defaultWriterBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `WritableStreamDefaultWriter.prototype.${name} can only be used on a WritableStreamDefaultWriter`);\n}\n\nfunction defaultWriterLockException(name: string): TypeError {\n  return new TypeError('Cannot ' + name + ' a stream using a released writer');\n}\n\nfunction defaultWriterClosedPromiseInitialize(writer: WritableStreamDefaultWriter) {\n  writer._closedPromise = newPromise((resolve, reject) => {\n    writer._closedPromise_resolve = resolve;\n    writer._closedPromise_reject = reject;\n    writer._closedPromiseState = 'pending';\n  });\n}\n\nfunction defaultWriterClosedPromiseInitializeAsRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  defaultWriterClosedPromiseInitialize(writer);\n  defaultWriterClosedPromiseReject(writer, reason);\n}\n\nfunction defaultWriterClosedPromiseInitializeAsResolved(writer: WritableStreamDefaultWriter) {\n  defaultWriterClosedPromiseInitialize(writer);\n  defaultWriterClosedPromiseResolve(writer);\n}\n\nfunction defaultWriterClosedPromiseReject(writer: WritableStreamDefaultWriter, reason: any) {\n  if (writer._closedPromise_reject === undefined) {\n    return;\n  }\n  assert(writer._closedPromiseState === 'pending');\n\n  setPromiseIsHandledToTrue(writer._closedPromise);\n  writer._closedPromise_reject(reason);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'rejected';\n}\n\nfunction defaultWriterClosedPromiseResetToRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  assert(writer._closedPromise_resolve === undefined);\n  assert(writer._closedPromise_reject === undefined);\n  assert(writer._closedPromiseState !== 'pending');\n\n  defaultWriterClosedPromiseInitializeAsRejected(writer, reason);\n}\n\nfunction defaultWriterClosedPromiseResolve(writer: WritableStreamDefaultWriter) {\n  if (writer._closedPromise_resolve === undefined) {\n    return;\n  }\n  assert(writer._closedPromiseState === 'pending');\n\n  writer._closedPromise_resolve(undefined);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'resolved';\n}\n\nfunction defaultWriterReadyPromiseInitialize(writer: WritableStreamDefaultWriter) {\n  writer._readyPromise = newPromise((resolve, reject) => {\n    writer._readyPromise_resolve = resolve;\n    writer._readyPromise_reject = reject;\n  });\n  writer._readyPromiseState = 'pending';\n}\n\nfunction defaultWriterReadyPromiseInitializeAsRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  defaultWriterReadyPromiseInitialize(writer);\n  defaultWriterReadyPromiseReject(writer, reason);\n}\n\nfunction defaultWriterReadyPromiseInitializeAsResolved(writer: WritableStreamDefaultWriter) {\n  defaultWriterReadyPromiseInitialize(writer);\n  defaultWriterReadyPromiseResolve(writer);\n}\n\nfunction defaultWriterReadyPromiseReject(writer: WritableStreamDefaultWriter, reason: any) {\n  if (writer._readyPromise_reject === undefined) {\n    return;\n  }\n\n  setPromiseIsHandledToTrue(writer._readyPromise);\n  writer._readyPromise_reject(reason);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'rejected';\n}\n\nfunction defaultWriterReadyPromiseReset(writer: WritableStreamDefaultWriter) {\n  assert(writer._readyPromise_resolve === undefined);\n  assert(writer._readyPromise_reject === undefined);\n\n  defaultWriterReadyPromiseInitialize(writer);\n}\n\nfunction defaultWriterReadyPromiseResetToRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  assert(writer._readyPromise_resolve === undefined);\n  assert(writer._readyPromise_reject === undefined);\n\n  defaultWriterReadyPromiseInitializeAsRejected(writer, reason);\n}\n\nfunction defaultWriterReadyPromiseResolve(writer: WritableStreamDefaultWriter) {\n  if (writer._readyPromise_resolve === undefined) {\n    return;\n  }\n\n  writer._readyPromise_resolve(undefined);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'fulfilled';\n}\n","/// <reference lib=\"dom\" />\nexport const NativeDOMException: typeof DOMException | undefined =\n  typeof DOMException !== 'undefined' ? DOMException : undefined;\n","/// <reference types=\"node\" />\nimport { NativeDOMException } from './native';\n\ndeclare class DOMExceptionClass extends Error {\n  constructor(message?: string, name?: string);\n\n  name: string;\n  message: string;\n}\n\ntype DOMException = DOMExceptionClass;\ntype DOMExceptionConstructor = typeof DOMExceptionClass;\n\nfunction isDOMExceptionConstructor(ctor: unknown): ctor is DOMExceptionConstructor {\n  if (!(typeof ctor === 'function' || typeof ctor === 'object')) {\n    return false;\n  }\n  try {\n    new (ctor as DOMExceptionConstructor)();\n    return true;\n  } catch {\n    return false;\n  }\n}\n\nfunction createDOMExceptionPolyfill(): DOMExceptionConstructor {\n  // eslint-disable-next-line no-shadow\n  const ctor = function DOMException(this: DOMException, message?: string, name?: string) {\n    this.message = message || '';\n    this.name = name || 'Error';\n    if (Error.captureStackTrace) {\n      Error.captureStackTrace(this, this.constructor);\n    }\n  } as any;\n  ctor.prototype = Object.create(Error.prototype);\n  Object.defineProperty(ctor.prototype, 'constructor', { value: ctor, writable: true, configurable: true });\n  return ctor;\n}\n\n// eslint-disable-next-line no-redeclare\nconst DOMException: DOMExceptionConstructor =\n  isDOMExceptionConstructor(NativeDOMException) ? NativeDOMException : createDOMExceptionPolyfill();\n\nexport { DOMException };\n","import { IsReadableStream, IsReadableStreamLocked, ReadableStream, ReadableStreamCancel } from '../readable-stream';\nimport { AcquireReadableStreamDefaultReader, ReadableStreamDefaultReaderRead } from './default-reader';\nimport { ReadableStreamReaderGenericRelease } from './generic-reader';\nimport {\n  AcquireWritableStreamDefaultWriter,\n  IsWritableStream,\n  IsWritableStreamLocked,\n  WritableStream,\n  WritableStreamAbort,\n  WritableStreamCloseQueuedOrInFlight,\n  WritableStreamDefaultWriterCloseWithErrorPropagation,\n  WritableStreamDefaultWriterRelease,\n  WritableStreamDefaultWriterWrite\n} from '../writable-stream';\nimport assert from '../../stub/assert';\nimport {\n  newPromise,\n  PerformPromiseThen,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  uponFulfillment,\n  uponPromise,\n  uponRejection\n} from '../helpers/webidl';\nimport { noop } from '../../utils';\nimport { AbortSignal, isAbortSignal } from '../abort-signal';\nimport { DOMException } from '../../stub/dom-exception';\n\nexport function ReadableStreamPipeTo<T>(source: ReadableStream<T>,\n                                        dest: WritableStream<T>,\n                                        preventClose: boolean,\n                                        preventAbort: boolean,\n                                        preventCancel: boolean,\n                                        signal: AbortSignal | undefined): Promise<undefined> {\n  assert(IsReadableStream(source));\n  assert(IsWritableStream(dest));\n  assert(typeof preventClose === 'boolean');\n  assert(typeof preventAbort === 'boolean');\n  assert(typeof preventCancel === 'boolean');\n  assert(signal === undefined || isAbortSignal(signal));\n  assert(!IsReadableStreamLocked(source));\n  assert(!IsWritableStreamLocked(dest));\n\n  const reader = AcquireReadableStreamDefaultReader<T>(source);\n  const writer = AcquireWritableStreamDefaultWriter<T>(dest);\n\n  source._disturbed = true;\n\n  let shuttingDown = false;\n\n  // This is used to keep track of the spec's requirement that we wait for ongoing writes during shutdown.\n  let currentWrite = promiseResolvedWith<void>(undefined);\n\n  return newPromise((resolve, reject) => {\n    let abortAlgorithm: () => void;\n    if (signal !== undefined) {\n      abortAlgorithm = () => {\n        const error = new DOMException('Aborted', 'AbortError');\n        const actions: Array<() => Promise<void>> = [];\n        if (!preventAbort) {\n          actions.push(() => {\n            if (dest._state === 'writable') {\n              return WritableStreamAbort(dest, error);\n            }\n            return promiseResolvedWith(undefined);\n          });\n        }\n        if (!preventCancel) {\n          actions.push(() => {\n            if (source._state === 'readable') {\n              return ReadableStreamCancel(source, error);\n            }\n            return promiseResolvedWith(undefined);\n          });\n        }\n        shutdownWithAction(() => Promise.all(actions.map(action => action())), true, error);\n      };\n\n      if (signal.aborted) {\n        abortAlgorithm();\n        return;\n      }\n\n      signal.addEventListener('abort', abortAlgorithm);\n    }\n\n    // Using reader and writer, read all chunks from this and write them to dest\n    // - Backpressure must be enforced\n    // - Shutdown must stop all activity\n    function pipeLoop() {\n      return newPromise<void>((resolveLoop, rejectLoop) => {\n        function next(done: boolean) {\n          if (done) {\n            resolveLoop();\n          } else {\n            // Use `PerformPromiseThen` instead of `uponPromise` to avoid\n            // adding unnecessary `.catch(rethrowAssertionErrorRejection)` handlers\n            PerformPromiseThen(pipeStep(), next, rejectLoop);\n          }\n        }\n\n        next(false);\n      });\n    }\n\n    function pipeStep(): Promise<boolean> {\n      if (shuttingDown) {\n        return promiseResolvedWith(true);\n      }\n\n      return PerformPromiseThen(writer._readyPromise, () => {\n        return newPromise<boolean>((resolveRead, rejectRead) => {\n          ReadableStreamDefaultReaderRead(\n            reader,\n            {\n              _chunkSteps: chunk => {\n                currentWrite = PerformPromiseThen(WritableStreamDefaultWriterWrite(writer, chunk), undefined, noop);\n                resolveRead(false);\n              },\n              _closeSteps: () => resolveRead(true),\n              _errorSteps: rejectRead\n            }\n          );\n        });\n      });\n    }\n\n    // Errors must be propagated forward\n    isOrBecomesErrored(source, reader._closedPromise, storedError => {\n      if (!preventAbort) {\n        shutdownWithAction(() => WritableStreamAbort(dest, storedError), true, storedError);\n      } else {\n        shutdown(true, storedError);\n      }\n    });\n\n    // Errors must be propagated backward\n    isOrBecomesErrored(dest, writer._closedPromise, storedError => {\n      if (!preventCancel) {\n        shutdownWithAction(() => ReadableStreamCancel(source, storedError), true, storedError);\n      } else {\n        shutdown(true, storedError);\n      }\n    });\n\n    // Closing must be propagated forward\n    isOrBecomesClosed(source, reader._closedPromise, () => {\n      if (!preventClose) {\n        shutdownWithAction(() => WritableStreamDefaultWriterCloseWithErrorPropagation(writer));\n      } else {\n        shutdown();\n      }\n    });\n\n    // Closing must be propagated backward\n    if (WritableStreamCloseQueuedOrInFlight(dest) || dest._state === 'closed') {\n      const destClosed = new TypeError('the destination writable stream closed before all data could be piped to it');\n\n      if (!preventCancel) {\n        shutdownWithAction(() => ReadableStreamCancel(source, destClosed), true, destClosed);\n      } else {\n        shutdown(true, destClosed);\n      }\n    }\n\n    setPromiseIsHandledToTrue(pipeLoop());\n\n    function waitForWritesToFinish(): Promise<void> {\n      // Another write may have started while we were waiting on this currentWrite, so we have to be sure to wait\n      // for that too.\n      const oldCurrentWrite = currentWrite;\n      return PerformPromiseThen(\n        currentWrite,\n        () => oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined\n      );\n    }\n\n    function isOrBecomesErrored(stream: ReadableStream | WritableStream,\n                                promise: Promise<void>,\n                                action: (reason: any) => void) {\n      if (stream._state === 'errored') {\n        action(stream._storedError);\n      } else {\n        uponRejection(promise, action);\n      }\n    }\n\n    function isOrBecomesClosed(stream: ReadableStream | WritableStream, promise: Promise<void>, action: () => void) {\n      if (stream._state === 'closed') {\n        action();\n      } else {\n        uponFulfillment(promise, action);\n      }\n    }\n\n    function shutdownWithAction(action: () => Promise<unknown>, originalIsError?: boolean, originalError?: any) {\n      if (shuttingDown) {\n        return;\n      }\n      shuttingDown = true;\n\n      if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {\n        uponFulfillment(waitForWritesToFinish(), doTheRest);\n      } else {\n        doTheRest();\n      }\n\n      function doTheRest() {\n        uponPromise(\n          action(),\n          () => finalize(originalIsError, originalError),\n          newError => finalize(true, newError)\n        );\n      }\n    }\n\n    function shutdown(isError?: boolean, error?: any) {\n      if (shuttingDown) {\n        return;\n      }\n      shuttingDown = true;\n\n      if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {\n        uponFulfillment(waitForWritesToFinish(), () => finalize(isError, error));\n      } else {\n        finalize(isError, error);\n      }\n    }\n\n    function finalize(isError?: boolean, error?: any) {\n      WritableStreamDefaultWriterRelease(writer);\n      ReadableStreamReaderGenericRelease(reader);\n\n      if (signal !== undefined) {\n        signal.removeEventListener('abort', abortAlgorithm);\n      }\n      if (isError) {\n        reject(error);\n      } else {\n        resolve(undefined);\n      }\n    }\n  });\n}\n","import { QueuingStrategySizeCallback } from '../queuing-strategy';\nimport assert from '../../stub/assert';\nimport { DequeueValue, EnqueueValueWithSize, QueuePair, ResetQueue } from '../abstract-ops/queue-with-sizes';\nimport {\n  ReadableStreamAddReadRequest,\n  ReadableStreamFulfillReadRequest,\n  ReadableStreamGetNumReadRequests,\n  ReadRequest\n} from './default-reader';\nimport { SimpleQueue } from '../simple-queue';\nimport { IsReadableStreamLocked, ReadableStream, ReadableStreamClose, ReadableStreamError } from '../readable-stream';\nimport { ValidatedUnderlyingSource } from './underlying-source';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { CancelSteps, PullSteps } from '../abstract-ops/internal-methods';\nimport { promiseResolvedWith, uponPromise } from '../helpers/webidl';\n\n/**\n * Allows control of a {@link ReadableStream | readable stream}'s state and internal queue.\n *\n * @public\n */\nexport class ReadableStreamDefaultController<R> {\n  /** @internal */\n  _controlledReadableStream!: ReadableStream<R>;\n  /** @internal */\n  _queue!: SimpleQueue<QueuePair<R>>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _closeRequested!: boolean;\n  /** @internal */\n  _pullAgain!: boolean;\n  /** @internal */\n  _pulling !: boolean;\n  /** @internal */\n  _strategySizeAlgorithm!: QueuingStrategySizeCallback<R>;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _pullAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _cancelAlgorithm!: (reason: any) => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is\n   * over-full. An underlying source ought to use this information to determine when and how to apply backpressure.\n   */\n  get desiredSize(): number | null {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('desiredSize');\n    }\n\n    return ReadableStreamDefaultControllerGetDesiredSize(this);\n  }\n\n  /**\n   * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from\n   * the stream, but once those are read, the stream will become closed.\n   */\n  close(): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('close');\n    }\n\n    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {\n      throw new TypeError('The stream is not in a state that permits close');\n    }\n\n    ReadableStreamDefaultControllerClose(this);\n  }\n\n  /**\n   * Enqueues the given chunk `chunk` in the controlled readable stream.\n   */\n  enqueue(chunk: R): void;\n  enqueue(chunk: R = undefined!): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('enqueue');\n    }\n\n    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {\n      throw new TypeError('The stream is not in a state that permits enqueue');\n    }\n\n    return ReadableStreamDefaultControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.\n   */\n  error(e: any = undefined): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n\n    ReadableStreamDefaultControllerError(this, e);\n  }\n\n  /** @internal */\n  [CancelSteps](reason: any): Promise<void> {\n    ResetQueue(this);\n    const result = this._cancelAlgorithm(reason);\n    ReadableStreamDefaultControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [PullSteps](readRequest: ReadRequest<R>): void {\n    const stream = this._controlledReadableStream;\n\n    if (this._queue.length > 0) {\n      const chunk = DequeueValue(this);\n\n      if (this._closeRequested && this._queue.length === 0) {\n        ReadableStreamDefaultControllerClearAlgorithms(this);\n        ReadableStreamClose(stream);\n      } else {\n        ReadableStreamDefaultControllerCallPullIfNeeded(this);\n      }\n\n      readRequest._chunkSteps(chunk);\n    } else {\n      ReadableStreamAddReadRequest(stream, readRequest);\n      ReadableStreamDefaultControllerCallPullIfNeeded(this);\n    }\n  }\n}\n\nObject.defineProperties(ReadableStreamDefaultController.prototype, {\n  close: { enumerable: true },\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Abstract operations for the ReadableStreamDefaultController.\n\nfunction IsReadableStreamDefaultController<R = any>(x: any): x is ReadableStreamDefaultController<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableStream')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamDefaultController;\n}\n\nfunction ReadableStreamDefaultControllerCallPullIfNeeded(controller: ReadableStreamDefaultController<any>): void {\n  const shouldPull = ReadableStreamDefaultControllerShouldCallPull(controller);\n  if (!shouldPull) {\n    return;\n  }\n\n  if (controller._pulling) {\n    controller._pullAgain = true;\n    return;\n  }\n\n  assert(!controller._pullAgain);\n\n  controller._pulling = true;\n\n  const pullPromise = controller._pullAlgorithm();\n  uponPromise(\n    pullPromise,\n    () => {\n      controller._pulling = false;\n\n      if (controller._pullAgain) {\n        controller._pullAgain = false;\n        ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n      }\n    },\n    e => {\n      ReadableStreamDefaultControllerError(controller, e);\n    }\n  );\n}\n\nfunction ReadableStreamDefaultControllerShouldCallPull(controller: ReadableStreamDefaultController<any>): boolean {\n  const stream = controller._controlledReadableStream;\n\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return false;\n  }\n\n  if (!controller._started) {\n    return false;\n  }\n\n  if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    return true;\n  }\n\n  const desiredSize = ReadableStreamDefaultControllerGetDesiredSize(controller);\n  assert(desiredSize !== null);\n  if (desiredSize! > 0) {\n    return true;\n  }\n\n  return false;\n}\n\nfunction ReadableStreamDefaultControllerClearAlgorithms(controller: ReadableStreamDefaultController<any>) {\n  controller._pullAlgorithm = undefined!;\n  controller._cancelAlgorithm = undefined!;\n  controller._strategySizeAlgorithm = undefined!;\n}\n\n// A client of ReadableStreamDefaultController may use these functions directly to bypass state check.\n\nexport function ReadableStreamDefaultControllerClose(controller: ReadableStreamDefaultController<any>) {\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return;\n  }\n\n  const stream = controller._controlledReadableStream;\n\n  controller._closeRequested = true;\n\n  if (controller._queue.length === 0) {\n    ReadableStreamDefaultControllerClearAlgorithms(controller);\n    ReadableStreamClose(stream);\n  }\n}\n\nexport function ReadableStreamDefaultControllerEnqueue<R>(\n  controller: ReadableStreamDefaultController<R>,\n  chunk: R\n): void {\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return;\n  }\n\n  const stream = controller._controlledReadableStream;\n\n  if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    ReadableStreamFulfillReadRequest(stream, chunk, false);\n  } else {\n    let chunkSize;\n    try {\n      chunkSize = controller._strategySizeAlgorithm(chunk);\n    } catch (chunkSizeE) {\n      ReadableStreamDefaultControllerError(controller, chunkSizeE);\n      throw chunkSizeE;\n    }\n\n    try {\n      EnqueueValueWithSize(controller, chunk, chunkSize);\n    } catch (enqueueE) {\n      ReadableStreamDefaultControllerError(controller, enqueueE);\n      throw enqueueE;\n    }\n  }\n\n  ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n}\n\nexport function ReadableStreamDefaultControllerError(controller: ReadableStreamDefaultController<any>, e: any) {\n  const stream = controller._controlledReadableStream;\n\n  if (stream._state !== 'readable') {\n    return;\n  }\n\n  ResetQueue(controller);\n\n  ReadableStreamDefaultControllerClearAlgorithms(controller);\n  ReadableStreamError(stream, e);\n}\n\nexport function ReadableStreamDefaultControllerGetDesiredSize(\n  controller: ReadableStreamDefaultController<any>\n): number | null {\n  const state = controller._controlledReadableStream._state;\n\n  if (state === 'errored') {\n    return null;\n  }\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\n// This is used in the implementation of TransformStream.\nexport function ReadableStreamDefaultControllerHasBackpressure(\n  controller: ReadableStreamDefaultController<any>\n): boolean {\n  if (ReadableStreamDefaultControllerShouldCallPull(controller)) {\n    return false;\n  }\n\n  return true;\n}\n\nexport function ReadableStreamDefaultControllerCanCloseOrEnqueue(\n  controller: ReadableStreamDefaultController<any>\n): boolean {\n  const state = controller._controlledReadableStream._state;\n\n  if (!controller._closeRequested && state === 'readable') {\n    return true;\n  }\n\n  return false;\n}\n\nexport function SetUpReadableStreamDefaultController<R>(stream: ReadableStream<R>,\n                                                        controller: ReadableStreamDefaultController<R>,\n                                                        startAlgorithm: () => void | PromiseLike<void>,\n                                                        pullAlgorithm: () => Promise<void>,\n                                                        cancelAlgorithm: (reason: any) => Promise<void>,\n                                                        highWaterMark: number,\n                                                        sizeAlgorithm: QueuingStrategySizeCallback<R>) {\n  assert(stream._readableStreamController === undefined);\n\n  controller._controlledReadableStream = stream;\n\n  controller._queue = undefined!;\n  controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._started = false;\n  controller._closeRequested = false;\n  controller._pullAgain = false;\n  controller._pulling = false;\n\n  controller._strategySizeAlgorithm = sizeAlgorithm;\n  controller._strategyHWM = highWaterMark;\n\n  controller._pullAlgorithm = pullAlgorithm;\n  controller._cancelAlgorithm = cancelAlgorithm;\n\n  stream._readableStreamController = controller;\n\n  const startResult = startAlgorithm();\n  uponPromise(\n    promiseResolvedWith(startResult),\n    () => {\n      controller._started = true;\n\n      assert(!controller._pulling);\n      assert(!controller._pullAgain);\n\n      ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n    },\n    r => {\n      ReadableStreamDefaultControllerError(controller, r);\n    }\n  );\n}\n\nexport function SetUpReadableStreamDefaultControllerFromUnderlyingSource<R>(\n  stream: ReadableStream<R>,\n  underlyingSource: ValidatedUnderlyingSource<R>,\n  highWaterMark: number,\n  sizeAlgorithm: QueuingStrategySizeCallback<R>\n) {\n  const controller: ReadableStreamDefaultController<R> = Object.create(ReadableStreamDefaultController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let pullAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let cancelAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingSource.start !== undefined) {\n    startAlgorithm = () => underlyingSource.start!(controller);\n  }\n  if (underlyingSource.pull !== undefined) {\n    pullAlgorithm = () => underlyingSource.pull!(controller);\n  }\n  if (underlyingSource.cancel !== undefined) {\n    cancelAlgorithm = reason => underlyingSource.cancel!(reason);\n  }\n\n  SetUpReadableStreamDefaultController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm\n  );\n}\n\n// Helper functions for the ReadableStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamDefaultController.prototype.${name} can only be used on a ReadableStreamDefaultController`);\n}\n","import {\n  CreateReadableByteStream,\n  CreateReadableStream,\n  IsReadableStream,\n  ReadableByteStream,\n  ReadableStream,\n  ReadableStreamCancel,\n  ReadableStreamReader\n} from '../readable-stream';\nimport { ReadableStreamReaderGenericRelease } from './generic-reader';\nimport {\n  AcquireReadableStreamDefaultReader,\n  IsReadableStreamDefaultReader,\n  ReadableStreamDefaultReaderRead,\n  ReadRequest\n} from './default-reader';\nimport {\n  AcquireReadableStreamBYOBReader,\n  IsReadableStreamBYOBReader,\n  ReadableStreamBYOBReaderRead,\n  ReadIntoRequest\n} from './byob-reader';\nimport assert from '../../stub/assert';\nimport { newPromise, promiseResolvedWith, queueMicrotask, uponRejection } from '../helpers/webidl';\nimport {\n  ReadableStreamDefaultController,\n  ReadableStreamDefaultControllerClose,\n  ReadableStreamDefaultControllerEnqueue,\n  ReadableStreamDefaultControllerError\n} from './default-controller';\nimport {\n  IsReadableByteStreamController,\n  ReadableByteStreamControllerClose,\n  ReadableByteStreamControllerEnqueue,\n  ReadableByteStreamControllerError,\n  ReadableByteStreamControllerGetBYOBRequest,\n  ReadableByteStreamControllerRespond,\n  ReadableByteStreamControllerRespondWithNewView\n} from './byte-stream-controller';\nimport { CreateArrayFromList } from '../abstract-ops/ecmascript';\nimport { CloneAsUint8Array } from '../abstract-ops/miscellaneous';\n\nexport function ReadableStreamTee<R>(stream: ReadableStream<R>,\n                                     cloneForBranch2: boolean): [ReadableStream<R>, ReadableStream<R>] {\n  assert(IsReadableStream(stream));\n  assert(typeof cloneForBranch2 === 'boolean');\n  if (IsReadableByteStreamController(stream._readableStreamController)) {\n    return ReadableByteStreamTee(stream as unknown as ReadableByteStream) as\n      unknown as [ReadableStream<R>, ReadableStream<R>];\n  }\n  return ReadableStreamDefaultTee(stream, cloneForBranch2);\n}\n\nexport function ReadableStreamDefaultTee<R>(stream: ReadableStream<R>,\n                                            cloneForBranch2: boolean): [ReadableStream<R>, ReadableStream<R>] {\n  assert(IsReadableStream(stream));\n  assert(typeof cloneForBranch2 === 'boolean');\n\n  const reader = AcquireReadableStreamDefaultReader<R>(stream);\n\n  let reading = false;\n  let readAgain = false;\n  let canceled1 = false;\n  let canceled2 = false;\n  let reason1: any;\n  let reason2: any;\n  let branch1: ReadableStream<R>;\n  let branch2: ReadableStream<R>;\n\n  let resolveCancelPromise: (value: undefined | Promise<undefined>) => void;\n  const cancelPromise = newPromise<undefined>(resolve => {\n    resolveCancelPromise = resolve;\n  });\n\n  function pullAlgorithm(): Promise<void> {\n    if (reading) {\n      readAgain = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgain = false;\n          const chunk1 = chunk;\n          const chunk2 = chunk;\n\n          // There is no way to access the cloning code right now in the reference implementation.\n          // If we add one then we'll need an implementation for serializable objects.\n          // if (!canceled2 && cloneForBranch2) {\n          //   chunk2 = StructuredDeserialize(StructuredSerialize(chunk2));\n          // }\n\n          if (!canceled1) {\n            ReadableStreamDefaultControllerEnqueue(\n              branch1._readableStreamController as ReadableStreamDefaultController<R>,\n              chunk1\n            );\n          }\n          if (!canceled2) {\n            ReadableStreamDefaultControllerEnqueue(\n              branch2._readableStreamController as ReadableStreamDefaultController<R>,\n              chunk2\n            );\n          }\n\n          reading = false;\n          if (readAgain) {\n            pullAlgorithm();\n          }\n        });\n      },\n      _closeSteps: () => {\n        reading = false;\n        if (!canceled1) {\n          ReadableStreamDefaultControllerClose(branch1._readableStreamController as ReadableStreamDefaultController<R>);\n        }\n        if (!canceled2) {\n          ReadableStreamDefaultControllerClose(branch2._readableStreamController as ReadableStreamDefaultController<R>);\n        }\n\n        if (!canceled1 || !canceled2) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function cancel1Algorithm(reason: any): Promise<void> {\n    canceled1 = true;\n    reason1 = reason;\n    if (canceled2) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function cancel2Algorithm(reason: any): Promise<void> {\n    canceled2 = true;\n    reason2 = reason;\n    if (canceled1) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function startAlgorithm() {\n    // do nothing\n  }\n\n  branch1 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel1Algorithm);\n  branch2 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel2Algorithm);\n\n  uponRejection(reader._closedPromise, (r: any) => {\n    ReadableStreamDefaultControllerError(branch1._readableStreamController as ReadableStreamDefaultController<R>, r);\n    ReadableStreamDefaultControllerError(branch2._readableStreamController as ReadableStreamDefaultController<R>, r);\n    if (!canceled1 || !canceled2) {\n      resolveCancelPromise(undefined);\n    }\n  });\n\n  return [branch1, branch2];\n}\n\nexport function ReadableByteStreamTee(stream: ReadableByteStream): [ReadableByteStream, ReadableByteStream] {\n  assert(IsReadableStream(stream));\n  assert(IsReadableByteStreamController(stream._readableStreamController));\n\n  let reader: ReadableStreamReader<Uint8Array> = AcquireReadableStreamDefaultReader(stream);\n  let reading = false;\n  let readAgainForBranch1 = false;\n  let readAgainForBranch2 = false;\n  let canceled1 = false;\n  let canceled2 = false;\n  let reason1: any;\n  let reason2: any;\n  let branch1: ReadableByteStream;\n  let branch2: ReadableByteStream;\n\n  let resolveCancelPromise: (value: undefined | Promise<undefined>) => void;\n  const cancelPromise = newPromise<void>(resolve => {\n    resolveCancelPromise = resolve;\n  });\n\n  function forwardReaderError(thisReader: ReadableStreamReader<Uint8Array>) {\n    uponRejection(thisReader._closedPromise, r => {\n      if (thisReader !== reader) {\n        return;\n      }\n      ReadableByteStreamControllerError(branch1._readableStreamController, r);\n      ReadableByteStreamControllerError(branch2._readableStreamController, r);\n      if (!canceled1 || !canceled2) {\n        resolveCancelPromise(undefined);\n      }\n    });\n  }\n\n  function pullWithDefaultReader() {\n    if (IsReadableStreamBYOBReader(reader)) {\n      assert(reader._readIntoRequests.length === 0);\n      ReadableStreamReaderGenericRelease(reader);\n\n      reader = AcquireReadableStreamDefaultReader(stream);\n      forwardReaderError(reader);\n    }\n\n    const readRequest: ReadRequest<Uint8Array> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgainForBranch1 = false;\n          readAgainForBranch2 = false;\n\n          const chunk1 = chunk;\n          let chunk2 = chunk;\n          if (!canceled1 && !canceled2) {\n            try {\n              chunk2 = CloneAsUint8Array(chunk);\n            } catch (cloneE) {\n              ReadableByteStreamControllerError(branch1._readableStreamController, cloneE);\n              ReadableByteStreamControllerError(branch2._readableStreamController, cloneE);\n              resolveCancelPromise(ReadableStreamCancel(stream, cloneE));\n              return;\n            }\n          }\n\n          if (!canceled1) {\n            ReadableByteStreamControllerEnqueue(branch1._readableStreamController, chunk1);\n          }\n          if (!canceled2) {\n            ReadableByteStreamControllerEnqueue(branch2._readableStreamController, chunk2);\n          }\n\n          reading = false;\n          if (readAgainForBranch1) {\n            pull1Algorithm();\n          } else if (readAgainForBranch2) {\n            pull2Algorithm();\n          }\n        });\n      },\n      _closeSteps: () => {\n        reading = false;\n        if (!canceled1) {\n          ReadableByteStreamControllerClose(branch1._readableStreamController);\n        }\n        if (!canceled2) {\n          ReadableByteStreamControllerClose(branch2._readableStreamController);\n        }\n        if (branch1._readableStreamController._pendingPullIntos.length > 0) {\n          ReadableByteStreamControllerRespond(branch1._readableStreamController, 0);\n        }\n        if (branch2._readableStreamController._pendingPullIntos.length > 0) {\n          ReadableByteStreamControllerRespond(branch2._readableStreamController, 0);\n        }\n        if (!canceled1 || !canceled2) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n  }\n\n  function pullWithBYOBReader(view: ArrayBufferView, forBranch2: boolean) {\n    if (IsReadableStreamDefaultReader<Uint8Array>(reader)) {\n      assert(reader._readRequests.length === 0);\n      ReadableStreamReaderGenericRelease(reader);\n\n      reader = AcquireReadableStreamBYOBReader(stream);\n      forwardReaderError(reader);\n    }\n\n    const byobBranch = forBranch2 ? branch2 : branch1;\n    const otherBranch = forBranch2 ? branch1 : branch2;\n\n    const readIntoRequest: ReadIntoRequest<ArrayBufferView> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgainForBranch1 = false;\n          readAgainForBranch2 = false;\n\n          const byobCanceled = forBranch2 ? canceled2 : canceled1;\n          const otherCanceled = forBranch2 ? canceled1 : canceled2;\n\n          if (!otherCanceled) {\n            let clonedChunk;\n            try {\n              clonedChunk = CloneAsUint8Array(chunk);\n            } catch (cloneE) {\n              ReadableByteStreamControllerError(byobBranch._readableStreamController, cloneE);\n              ReadableByteStreamControllerError(otherBranch._readableStreamController, cloneE);\n              resolveCancelPromise(ReadableStreamCancel(stream, cloneE));\n              return;\n            }\n            if (!byobCanceled) {\n              ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n            }\n            ReadableByteStreamControllerEnqueue(otherBranch._readableStreamController, clonedChunk);\n          } else if (!byobCanceled) {\n            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n          }\n\n          reading = false;\n          if (readAgainForBranch1) {\n            pull1Algorithm();\n          } else if (readAgainForBranch2) {\n            pull2Algorithm();\n          }\n        });\n      },\n      _closeSteps: chunk => {\n        reading = false;\n\n        const byobCanceled = forBranch2 ? canceled2 : canceled1;\n        const otherCanceled = forBranch2 ? canceled1 : canceled2;\n\n        if (!byobCanceled) {\n          ReadableByteStreamControllerClose(byobBranch._readableStreamController);\n        }\n        if (!otherCanceled) {\n          ReadableByteStreamControllerClose(otherBranch._readableStreamController);\n        }\n\n        if (chunk !== undefined) {\n          assert(chunk.byteLength === 0);\n\n          if (!byobCanceled) {\n            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n          }\n          if (!otherCanceled && otherBranch._readableStreamController._pendingPullIntos.length > 0) {\n            ReadableByteStreamControllerRespond(otherBranch._readableStreamController, 0);\n          }\n        }\n\n        if (!byobCanceled || !otherCanceled) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamBYOBReaderRead(reader, view, readIntoRequest);\n  }\n\n  function pull1Algorithm(): Promise<void> {\n    if (reading) {\n      readAgainForBranch1 = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch1._readableStreamController);\n    if (byobRequest === null) {\n      pullWithDefaultReader();\n    } else {\n      pullWithBYOBReader(byobRequest._view!, false);\n    }\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function pull2Algorithm(): Promise<void> {\n    if (reading) {\n      readAgainForBranch2 = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch2._readableStreamController);\n    if (byobRequest === null) {\n      pullWithDefaultReader();\n    } else {\n      pullWithBYOBReader(byobRequest._view!, true);\n    }\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function cancel1Algorithm(reason: any): Promise<void> {\n    canceled1 = true;\n    reason1 = reason;\n    if (canceled2) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function cancel2Algorithm(reason: any): Promise<void> {\n    canceled2 = true;\n    reason2 = reason;\n    if (canceled1) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function startAlgorithm(): void {\n    return;\n  }\n\n  branch1 = CreateReadableByteStream(startAlgorithm, pull1Algorithm, cancel1Algorithm);\n  branch2 = CreateReadableByteStream(startAlgorithm, pull2Algorithm, cancel2Algorithm);\n\n  forwardReaderError(reader);\n\n  return [branch1, branch2];\n}\n","import { assertDictionary, assertFunction, convertUnsignedLongLongWithEnforceRange } from './basic';\nimport {\n  ReadableStreamController,\n  UnderlyingByteSource,\n  UnderlyingDefaultOrByteSource,\n  UnderlyingDefaultOrByteSourcePullCallback,\n  UnderlyingDefaultOrByteSourceStartCallback,\n  UnderlyingSource,\n  UnderlyingSourceCancelCallback,\n  ValidatedUnderlyingDefaultOrByteSource\n} from '../readable-stream/underlying-source';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\n\nexport function convertUnderlyingDefaultOrByteSource<R>(\n  source: UnderlyingSource<R> | UnderlyingByteSource | null,\n  context: string\n): ValidatedUnderlyingDefaultOrByteSource<R> {\n  assertDictionary(source, context);\n  const original = source as (UnderlyingDefaultOrByteSource<R> | null);\n  const autoAllocateChunkSize = original?.autoAllocateChunkSize;\n  const cancel = original?.cancel;\n  const pull = original?.pull;\n  const start = original?.start;\n  const type = original?.type;\n  return {\n    autoAllocateChunkSize: autoAllocateChunkSize === undefined ?\n      undefined :\n      convertUnsignedLongLongWithEnforceRange(\n        autoAllocateChunkSize,\n        `${context} has member 'autoAllocateChunkSize' that`\n      ),\n    cancel: cancel === undefined ?\n      undefined :\n      convertUnderlyingSourceCancelCallback(cancel, original!, `${context} has member 'cancel' that`),\n    pull: pull === undefined ?\n      undefined :\n      convertUnderlyingSourcePullCallback(pull, original!, `${context} has member 'pull' that`),\n    start: start === undefined ?\n      undefined :\n      convertUnderlyingSourceStartCallback(start, original!, `${context} has member 'start' that`),\n    type: type === undefined ? undefined : convertReadableStreamType(type, `${context} has member 'type' that`)\n  };\n}\n\nfunction convertUnderlyingSourceCancelCallback(\n  fn: UnderlyingSourceCancelCallback,\n  original: UnderlyingDefaultOrByteSource,\n  context: string\n): (reason: any) => Promise<void> {\n  assertFunction(fn, context);\n  return (reason: any) => promiseCall(fn, original, [reason]);\n}\n\nfunction convertUnderlyingSourcePullCallback<R>(\n  fn: UnderlyingDefaultOrByteSourcePullCallback<R>,\n  original: UnderlyingDefaultOrByteSource<R>,\n  context: string\n): (controller: ReadableStreamController<R>) => Promise<void> {\n  assertFunction(fn, context);\n  return (controller: ReadableStreamController<R>) => promiseCall(fn, original, [controller]);\n}\n\nfunction convertUnderlyingSourceStartCallback<R>(\n  fn: UnderlyingDefaultOrByteSourceStartCallback<R>,\n  original: UnderlyingDefaultOrByteSource<R>,\n  context: string\n): UnderlyingDefaultOrByteSourceStartCallback<R> {\n  assertFunction(fn, context);\n  return (controller: ReadableStreamController<R>) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertReadableStreamType(type: string, context: string): 'bytes' {\n  type = `${type}`;\n  if (type !== 'bytes') {\n    throw new TypeError(`${context} '${type}' is not a valid enumeration value for ReadableStreamType`);\n  }\n  return type;\n}\n","import { assertDictionary } from './basic';\nimport { ReadableStreamGetReaderOptions } from '../readable-stream/reader-options';\n\nexport function convertReaderOptions(options: ReadableStreamGetReaderOptions | null | undefined,\n                                     context: string): ReadableStreamGetReaderOptions {\n  assertDictionary(options, context);\n  const mode = options?.mode;\n  return {\n    mode: mode === undefined ? undefined : convertReadableStreamReaderMode(mode, `${context} has member 'mode' that`)\n  };\n}\n\nfunction convertReadableStreamReaderMode(mode: string, context: string): 'byob' {\n  mode = `${mode}`;\n  if (mode !== 'byob') {\n    throw new TypeError(`${context} '${mode}' is not a valid enumeration value for ReadableStreamReaderMode`);\n  }\n  return mode;\n}\n","import { assertDictionary } from './basic';\nimport {\n  ReadableStreamIteratorOptions,\n  ValidatedReadableStreamIteratorOptions\n} from '../readable-stream/iterator-options';\n\nexport function convertIteratorOptions(options: ReadableStreamIteratorOptions | null | undefined,\n                                       context: string): ValidatedReadableStreamIteratorOptions {\n  assertDictionary(options, context);\n  const preventCancel = options?.preventCancel;\n  return { preventCancel: Boolean(preventCancel) };\n}\n","import { assertDictionary } from './basic';\nimport { StreamPipeOptions, ValidatedStreamPipeOptions } from '../readable-stream/pipe-options';\nimport { AbortSignal, isAbortSignal } from '../abort-signal';\n\nexport function convertPipeOptions(options: StreamPipeOptions | null | undefined,\n                                   context: string): ValidatedStreamPipeOptions {\n  assertDictionary(options, context);\n  const preventAbort = options?.preventAbort;\n  const preventCancel = options?.preventCancel;\n  const preventClose = options?.preventClose;\n  const signal = options?.signal;\n  if (signal !== undefined) {\n    assertAbortSignal(signal, `${context} has member 'signal' that`);\n  }\n  return {\n    preventAbort: Boolean(preventAbort),\n    preventCancel: Boolean(preventCancel),\n    preventClose: Boolean(preventClose),\n    signal\n  };\n}\n\nfunction assertAbortSignal(signal: unknown, context: string): asserts signal is AbortSignal {\n  if (!isAbortSignal(signal)) {\n    throw new TypeError(`${context} is not an AbortSignal.`);\n  }\n}\n","import { assertDictionary, assertRequiredField } from './basic';\nimport { ReadableStream } from '../readable-stream';\nimport { WritableStream } from '../writable-stream';\nimport { assertReadableStream } from './readable-stream';\nimport { assertWritableStream } from './writable-stream';\n\nexport function convertReadableWritablePair<RS extends ReadableStream, WS extends WritableStream>(\n  pair: { readable: RS; writable: WS } | null | undefined,\n  context: string\n): { readable: RS; writable: WS } {\n  assertDictionary(pair, context);\n\n  const readable = pair?.readable;\n  assertRequiredField(readable, 'readable', 'ReadableWritablePair');\n  assertReadableStream(readable, `${context} has member 'readable' that`);\n\n  const writable = pair?.writable;\n  assertRequiredField(writable, 'writable', 'ReadableWritablePair');\n  assertWritableStream(writable, `${context} has member 'writable' that`);\n\n  return { readable, writable };\n}\n","import assert from '../stub/assert';\nimport {\n  promiseRejectedWith,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  transformPromiseWith\n} from './helpers/webidl';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { AcquireReadableStreamAsyncIterator, ReadableStreamAsyncIterator } from './readable-stream/async-iterator';\nimport { defaultReaderClosedPromiseReject, defaultReaderClosedPromiseResolve } from './readable-stream/generic-reader';\nimport {\n  AcquireReadableStreamDefaultReader,\n  IsReadableStreamDefaultReader,\n  ReadableStreamDefaultReader,\n  ReadableStreamDefaultReadResult\n} from './readable-stream/default-reader';\nimport {\n  AcquireReadableStreamBYOBReader,\n  IsReadableStreamBYOBReader,\n  ReadableStreamBYOBReader,\n  ReadableStreamBYOBReadResult\n} from './readable-stream/byob-reader';\nimport { ReadableStreamPipeTo } from './readable-stream/pipe';\nimport { ReadableStreamTee } from './readable-stream/tee';\nimport { IsWritableStream, IsWritableStreamLocked, WritableStream } from './writable-stream';\nimport { SimpleQueue } from './simple-queue';\nimport {\n  ReadableByteStreamController,\n  ReadableStreamBYOBRequest,\n  SetUpReadableByteStreamController,\n  SetUpReadableByteStreamControllerFromUnderlyingSource\n} from './readable-stream/byte-stream-controller';\nimport {\n  ReadableStreamDefaultController,\n  SetUpReadableStreamDefaultController,\n  SetUpReadableStreamDefaultControllerFromUnderlyingSource\n} from './readable-stream/default-controller';\nimport {\n  UnderlyingByteSource,\n  UnderlyingByteSourcePullCallback,\n  UnderlyingByteSourceStartCallback,\n  UnderlyingSource,\n  UnderlyingSourceCancelCallback,\n  UnderlyingSourcePullCallback,\n  UnderlyingSourceStartCallback\n} from './readable-stream/underlying-source';\nimport { noop } from '../utils';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { CreateArrayFromList } from './abstract-ops/ecmascript';\nimport { CancelSteps } from './abstract-ops/internal-methods';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { assertObject, assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport { convertUnderlyingDefaultOrByteSource } from './validators/underlying-source';\nimport { ReadableStreamGetReaderOptions } from './readable-stream/reader-options';\nimport { convertReaderOptions } from './validators/reader-options';\nimport { StreamPipeOptions, ValidatedStreamPipeOptions } from './readable-stream/pipe-options';\nimport { ReadableStreamIteratorOptions } from './readable-stream/iterator-options';\nimport { convertIteratorOptions } from './validators/iterator-options';\nimport { convertPipeOptions } from './validators/pipe-options';\nimport { ReadableWritablePair } from './readable-stream/readable-writable-pair';\nimport { convertReadableWritablePair } from './validators/readable-writable-pair';\n\nexport type ReadableByteStream = ReadableStream<Uint8Array> & {\n  _readableStreamController: ReadableByteStreamController\n};\n\ntype ReadableStreamState = 'readable' | 'closed' | 'errored';\n\n/**\n * A readable stream represents a source of data, from which you can read.\n *\n * @public\n */\nexport class ReadableStream<R = any> {\n  /** @internal */\n  _state!: ReadableStreamState;\n  /** @internal */\n  _reader: ReadableStreamReader<R> | undefined;\n  /** @internal */\n  _storedError: any;\n  /** @internal */\n  _disturbed!: boolean;\n  /** @internal */\n  _readableStreamController!: ReadableStreamDefaultController<R> | ReadableByteStreamController;\n\n  constructor(underlyingSource: UnderlyingByteSource, strategy?: { highWaterMark?: number; size?: undefined });\n  constructor(underlyingSource?: UnderlyingSource<R>, strategy?: QueuingStrategy<R>);\n  constructor(rawUnderlyingSource: UnderlyingSource<R> | UnderlyingByteSource | null | undefined = {},\n              rawStrategy: QueuingStrategy<R> | null | undefined = {}) {\n    if (rawUnderlyingSource === undefined) {\n      rawUnderlyingSource = null;\n    } else {\n      assertObject(rawUnderlyingSource, 'First parameter');\n    }\n\n    const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');\n    const underlyingSource = convertUnderlyingDefaultOrByteSource(rawUnderlyingSource, 'First parameter');\n\n    InitializeReadableStream(this);\n\n    if (underlyingSource.type === 'bytes') {\n      if (strategy.size !== undefined) {\n        throw new RangeError('The strategy for a byte stream cannot have a size function');\n      }\n      const highWaterMark = ExtractHighWaterMark(strategy, 0);\n      SetUpReadableByteStreamControllerFromUnderlyingSource(\n        this as unknown as ReadableByteStream,\n        underlyingSource,\n        highWaterMark\n      );\n    } else {\n      assert(underlyingSource.type === undefined);\n      const sizeAlgorithm = ExtractSizeAlgorithm(strategy);\n      const highWaterMark = ExtractHighWaterMark(strategy, 1);\n      SetUpReadableStreamDefaultControllerFromUnderlyingSource(\n        this,\n        underlyingSource,\n        highWaterMark,\n        sizeAlgorithm\n      );\n    }\n  }\n\n  /**\n   * Whether or not the readable stream is locked to a {@link ReadableStreamDefaultReader | reader}.\n   */\n  get locked(): boolean {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('locked');\n    }\n\n    return IsReadableStreamLocked(this);\n  }\n\n  /**\n   * Cancels the stream, signaling a loss of interest in the stream by a consumer.\n   *\n   * The supplied `reason` argument will be given to the underlying source's {@link UnderlyingSource.cancel | cancel()}\n   * method, which might or might not use it.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('cancel'));\n    }\n\n    if (IsReadableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot cancel a stream that already has a reader'));\n    }\n\n    return ReadableStreamCancel(this, reason);\n  }\n\n  /**\n   * Creates a {@link ReadableStreamBYOBReader} and locks the stream to the new reader.\n   *\n   * This call behaves the same way as the no-argument variant, except that it only works on readable byte streams,\n   * i.e. streams which were constructed specifically with the ability to handle \"bring your own buffer\" reading.\n   * The returned BYOB reader provides the ability to directly read individual chunks from the stream via its\n   * {@link ReadableStreamBYOBReader.read | read()} method, into developer-supplied buffers, allowing more precise\n   * control over allocation.\n   */\n  getReader({ mode }: { mode: 'byob' }): ReadableStreamBYOBReader;\n  /**\n   * Creates a {@link ReadableStreamDefaultReader} and locks the stream to the new reader.\n   * While the stream is locked, no other reader can be acquired until this one is released.\n   *\n   * This functionality is especially useful for creating abstractions that desire the ability to consume a stream\n   * in its entirety. By getting a reader for the stream, you can ensure nobody else can interleave reads with yours\n   * or cancel the stream, which would interfere with your abstraction.\n   */\n  getReader(): ReadableStreamDefaultReader<R>;\n  getReader(\n    rawOptions: ReadableStreamGetReaderOptions | null | undefined = undefined\n  ): ReadableStreamDefaultReader<R> | ReadableStreamBYOBReader {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('getReader');\n    }\n\n    const options = convertReaderOptions(rawOptions, 'First parameter');\n\n    if (options.mode === undefined) {\n      return AcquireReadableStreamDefaultReader(this);\n    }\n\n    assert(options.mode === 'byob');\n    return AcquireReadableStreamBYOBReader(this as unknown as ReadableByteStream);\n  }\n\n  /**\n   * Provides a convenient, chainable way of piping this readable stream through a transform stream\n   * (or any other `{ writable, readable }` pair). It simply {@link ReadableStream.pipeTo | pipes} the stream\n   * into the writable side of the supplied pair, and returns the readable side for further use.\n   *\n   * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.\n   */\n  pipeThrough<RS extends ReadableStream>(\n    transform: { readable: RS; writable: WritableStream<R> },\n    options?: StreamPipeOptions\n  ): RS;\n  pipeThrough<RS extends ReadableStream>(\n    rawTransform: { readable: RS; writable: WritableStream<R> } | null | undefined,\n    rawOptions: StreamPipeOptions | null | undefined = {}\n  ): RS {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('pipeThrough');\n    }\n    assertRequiredArgument(rawTransform, 1, 'pipeThrough');\n\n    const transform = convertReadableWritablePair(rawTransform, 'First parameter');\n    const options = convertPipeOptions(rawOptions, 'Second parameter');\n\n    if (IsReadableStreamLocked(this)) {\n      throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked ReadableStream');\n    }\n    if (IsWritableStreamLocked(transform.writable)) {\n      throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked WritableStream');\n    }\n\n    const promise = ReadableStreamPipeTo(\n      this, transform.writable, options.preventClose, options.preventAbort, options.preventCancel, options.signal\n    );\n\n    setPromiseIsHandledToTrue(promise);\n\n    return transform.readable;\n  }\n\n  /**\n   * Pipes this readable stream to a given writable stream. The way in which the piping process behaves under\n   * various error conditions can be customized with a number of passed options. It returns a promise that fulfills\n   * when the piping process completes successfully, or rejects if any errors were encountered.\n   *\n   * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.\n   */\n  pipeTo(destination: WritableStream<R>, options?: StreamPipeOptions): Promise<void>;\n  pipeTo(destination: WritableStream<R> | null | undefined,\n         rawOptions: StreamPipeOptions | null | undefined = {}): Promise<void> {\n    if (!IsReadableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('pipeTo'));\n    }\n\n    if (destination === undefined) {\n      return promiseRejectedWith(`Parameter 1 is required in 'pipeTo'.`);\n    }\n    if (!IsWritableStream(destination)) {\n      return promiseRejectedWith(\n        new TypeError(`ReadableStream.prototype.pipeTo's first argument must be a WritableStream`)\n      );\n    }\n\n    let options: ValidatedStreamPipeOptions;\n    try {\n      options = convertPipeOptions(rawOptions, 'Second parameter');\n    } catch (e) {\n      return promiseRejectedWith(e);\n    }\n\n    if (IsReadableStreamLocked(this)) {\n      return promiseRejectedWith(\n        new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream')\n      );\n    }\n    if (IsWritableStreamLocked(destination)) {\n      return promiseRejectedWith(\n        new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream')\n      );\n    }\n\n    return ReadableStreamPipeTo<R>(\n      this, destination, options.preventClose, options.preventAbort, options.preventCancel, options.signal\n    );\n  }\n\n  /**\n   * Tees this readable stream, returning a two-element array containing the two resulting branches as\n   * new {@link ReadableStream} instances.\n   *\n   * Teeing a stream will lock it, preventing any other consumer from acquiring a reader.\n   * To cancel the stream, cancel both of the resulting branches; a composite cancellation reason will then be\n   * propagated to the stream's underlying source.\n   *\n   * Note that the chunks seen in each branch will be the same object. If the chunks are not immutable,\n   * this could allow interference between the two branches.\n   */\n  tee(): [ReadableStream<R>, ReadableStream<R>] {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('tee');\n    }\n\n    const branches = ReadableStreamTee(this, false);\n    return CreateArrayFromList(branches);\n  }\n\n  /**\n   * Asynchronously iterates over the chunks in the stream's internal queue.\n   *\n   * Asynchronously iterating over the stream will lock it, preventing any other consumer from acquiring a reader.\n   * The lock will be released if the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method\n   * is called, e.g. by breaking out of the loop.\n   *\n   * By default, calling the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method will also\n   * cancel the stream. To prevent this, use the stream's {@link ReadableStream.values | values()} method, passing\n   * `true` for the `preventCancel` option.\n   */\n  values(options?: ReadableStreamIteratorOptions): ReadableStreamAsyncIterator<R>;\n  values(rawOptions: ReadableStreamIteratorOptions | null | undefined = undefined): ReadableStreamAsyncIterator<R> {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('values');\n    }\n\n    const options = convertIteratorOptions(rawOptions, 'First parameter');\n    return AcquireReadableStreamAsyncIterator<R>(this, options.preventCancel);\n  }\n\n  /**\n   * {@inheritDoc ReadableStream.values}\n   */\n  [Symbol.asyncIterator]: (options?: ReadableStreamIteratorOptions) => ReadableStreamAsyncIterator<R>;\n}\n\nObject.defineProperties(ReadableStream.prototype, {\n  cancel: { enumerable: true },\n  getReader: { enumerable: true },\n  pipeThrough: { enumerable: true },\n  pipeTo: { enumerable: true },\n  tee: { enumerable: true },\n  values: { enumerable: true },\n  locked: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStream.prototype, Symbol.toStringTag, {\n    value: 'ReadableStream',\n    configurable: true\n  });\n}\nif (typeof Symbol.asyncIterator === 'symbol') {\n  Object.defineProperty(ReadableStream.prototype, Symbol.asyncIterator, {\n    value: ReadableStream.prototype.values,\n    writable: true,\n    configurable: true\n  });\n}\n\nexport {\n  ReadableStreamAsyncIterator,\n  ReadableStreamDefaultReadResult,\n  ReadableStreamBYOBReadResult,\n  UnderlyingByteSource,\n  UnderlyingSource,\n  UnderlyingSourceStartCallback,\n  UnderlyingSourcePullCallback,\n  UnderlyingSourceCancelCallback,\n  UnderlyingByteSourceStartCallback,\n  UnderlyingByteSourcePullCallback,\n  StreamPipeOptions,\n  ReadableWritablePair,\n  ReadableStreamIteratorOptions\n};\n\n// Abstract operations for the ReadableStream.\n\n// Throws if and only if startAlgorithm throws.\nexport function CreateReadableStream<R>(startAlgorithm: () => void | PromiseLike<void>,\n                                        pullAlgorithm: () => Promise<void>,\n                                        cancelAlgorithm: (reason: any) => Promise<void>,\n                                        highWaterMark = 1,\n                                        sizeAlgorithm: QueuingStrategySizeCallback<R> = () => 1): ReadableStream<R> {\n  assert(IsNonNegativeNumber(highWaterMark));\n\n  const stream: ReadableStream<R> = Object.create(ReadableStream.prototype);\n  InitializeReadableStream(stream);\n\n  const controller: ReadableStreamDefaultController<R> = Object.create(ReadableStreamDefaultController.prototype);\n  SetUpReadableStreamDefaultController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm\n  );\n\n  return stream;\n}\n\n// Throws if and only if startAlgorithm throws.\nexport function CreateReadableByteStream(\n  startAlgorithm: () => void | PromiseLike<void>,\n  pullAlgorithm: () => Promise<void>,\n  cancelAlgorithm: (reason: any) => Promise<void>\n): ReadableByteStream {\n  const stream: ReadableByteStream = Object.create(ReadableStream.prototype);\n  InitializeReadableStream(stream);\n\n  const controller: ReadableByteStreamController = Object.create(ReadableByteStreamController.prototype);\n  SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, 0, undefined);\n\n  return stream;\n}\n\nfunction InitializeReadableStream(stream: ReadableStream) {\n  stream._state = 'readable';\n  stream._reader = undefined;\n  stream._storedError = undefined;\n  stream._disturbed = false;\n}\n\nexport function IsReadableStream(x: unknown): x is ReadableStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readableStreamController')) {\n    return false;\n  }\n\n  return x instanceof ReadableStream;\n}\n\nexport function IsReadableStreamDisturbed(stream: ReadableStream): boolean {\n  assert(IsReadableStream(stream));\n\n  return stream._disturbed;\n}\n\nexport function IsReadableStreamLocked(stream: ReadableStream): boolean {\n  assert(IsReadableStream(stream));\n\n  if (stream._reader === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamCancel<R>(stream: ReadableStream<R>, reason: any): Promise<undefined> {\n  stream._disturbed = true;\n\n  if (stream._state === 'closed') {\n    return promiseResolvedWith(undefined);\n  }\n  if (stream._state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  ReadableStreamClose(stream);\n\n  const reader = stream._reader;\n  if (reader !== undefined && IsReadableStreamBYOBReader(reader)) {\n    reader._readIntoRequests.forEach(readIntoRequest => {\n      readIntoRequest._closeSteps(undefined);\n    });\n    reader._readIntoRequests = new SimpleQueue();\n  }\n\n  const sourceCancelPromise = stream._readableStreamController[CancelSteps](reason);\n  return transformPromiseWith(sourceCancelPromise, noop);\n}\n\nexport function ReadableStreamClose<R>(stream: ReadableStream<R>): void {\n  assert(stream._state === 'readable');\n\n  stream._state = 'closed';\n\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return;\n  }\n\n  defaultReaderClosedPromiseResolve(reader);\n\n  if (IsReadableStreamDefaultReader<R>(reader)) {\n    reader._readRequests.forEach(readRequest => {\n      readRequest._closeSteps();\n    });\n    reader._readRequests = new SimpleQueue();\n  }\n}\n\nexport function ReadableStreamError<R>(stream: ReadableStream<R>, e: any): void {\n  assert(IsReadableStream(stream));\n  assert(stream._state === 'readable');\n\n  stream._state = 'errored';\n  stream._storedError = e;\n\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return;\n  }\n\n  defaultReaderClosedPromiseReject(reader, e);\n\n  if (IsReadableStreamDefaultReader<R>(reader)) {\n    reader._readRequests.forEach(readRequest => {\n      readRequest._errorSteps(e);\n    });\n\n    reader._readRequests = new SimpleQueue();\n  } else {\n    assert(IsReadableStreamBYOBReader(reader));\n\n    reader._readIntoRequests.forEach(readIntoRequest => {\n      readIntoRequest._errorSteps(e);\n    });\n\n    reader._readIntoRequests = new SimpleQueue();\n  }\n}\n\n// Readers\n\nexport type ReadableStreamReader<R> = ReadableStreamDefaultReader<R> | ReadableStreamBYOBReader;\n\nexport {\n  ReadableStreamDefaultReader,\n  ReadableStreamBYOBReader\n};\n\n// Controllers\n\nexport {\n  ReadableStreamDefaultController,\n  ReadableStreamBYOBRequest,\n  ReadableByteStreamController\n};\n\n// Helper functions for the ReadableStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(`ReadableStream.prototype.${name} can only be used on a ReadableStream`);\n}\n","import { QueuingStrategyInit } from '../queuing-strategy';\nimport { assertDictionary, assertRequiredField, convertUnrestrictedDouble } from './basic';\n\nexport function convertQueuingStrategyInit(init: QueuingStrategyInit | null | undefined,\n                                           context: string): QueuingStrategyInit {\n  assertDictionary(init, context);\n  const highWaterMark = init?.highWaterMark;\n  assertRequiredField(highWaterMark, 'highWaterMark', 'QueuingStrategyInit');\n  return {\n    highWaterMark: convertUnrestrictedDouble(highWaterMark)\n  };\n}\n","import { QueuingStrategy, QueuingStrategyInit } from './queuing-strategy';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategyInit } from './validators/queuing-strategy-init';\n\n// The size function must not have a prototype property nor be a constructor\nconst byteLengthSizeFunction = (chunk: ArrayBufferView): number => {\n  return chunk.byteLength;\n};\ntry {\n  Object.defineProperty(byteLengthSizeFunction, 'name', {\n    value: 'size',\n    configurable: true\n  });\n} catch {\n  // This property is non-configurable in older browsers, so ignore if this throws.\n  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility\n}\n\n/**\n * A queuing strategy that counts the number of bytes in each chunk.\n *\n * @public\n */\nexport default class ByteLengthQueuingStrategy implements QueuingStrategy<ArrayBufferView> {\n  /** @internal */\n  readonly _byteLengthQueuingStrategyHighWaterMark: number;\n\n  constructor(options: QueuingStrategyInit) {\n    assertRequiredArgument(options, 1, 'ByteLengthQueuingStrategy');\n    options = convertQueuingStrategyInit(options, 'First parameter');\n    this._byteLengthQueuingStrategyHighWaterMark = options.highWaterMark;\n  }\n\n  /**\n   * Returns the high water mark provided to the constructor.\n   */\n  get highWaterMark(): number {\n    if (!IsByteLengthQueuingStrategy(this)) {\n      throw byteLengthBrandCheckException('highWaterMark');\n    }\n    return this._byteLengthQueuingStrategyHighWaterMark;\n  }\n\n  /**\n   * Measures the size of `chunk` by returning the value of its `byteLength` property.\n   */\n  get size(): (chunk: ArrayBufferView) => number {\n    if (!IsByteLengthQueuingStrategy(this)) {\n      throw byteLengthBrandCheckException('size');\n    }\n    return byteLengthSizeFunction;\n  }\n}\n\nObject.defineProperties(ByteLengthQueuingStrategy.prototype, {\n  highWaterMark: { enumerable: true },\n  size: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ByteLengthQueuingStrategy.prototype, Symbol.toStringTag, {\n    value: 'ByteLengthQueuingStrategy',\n    configurable: true\n  });\n}\n\n// Helper functions for the ByteLengthQueuingStrategy.\n\nfunction byteLengthBrandCheckException(name: string): TypeError {\n  return new TypeError(`ByteLengthQueuingStrategy.prototype.${name} can only be used on a ByteLengthQueuingStrategy`);\n}\n\nexport function IsByteLengthQueuingStrategy(x: any): x is ByteLengthQueuingStrategy {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_byteLengthQueuingStrategyHighWaterMark')) {\n    return false;\n  }\n\n  return x instanceof ByteLengthQueuingStrategy;\n}\n","import { QueuingStrategy, QueuingStrategyInit } from './queuing-strategy';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategyInit } from './validators/queuing-strategy-init';\n\n// The size function must not have a prototype property nor be a constructor\nconst countSizeFunction = (): 1 => {\n  return 1;\n};\ntry {\n  Object.defineProperty(countSizeFunction, 'name', {\n    value: 'size',\n    configurable: true\n  });\n} catch {\n  // This property is non-configurable in older browsers, so ignore if this throws.\n  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility\n}\n\n/**\n * A queuing strategy that counts the number of chunks.\n *\n * @public\n */\nexport default class CountQueuingStrategy implements QueuingStrategy<any> {\n  /** @internal */\n  readonly _countQueuingStrategyHighWaterMark!: number;\n\n  constructor(options: QueuingStrategyInit) {\n    assertRequiredArgument(options, 1, 'CountQueuingStrategy');\n    options = convertQueuingStrategyInit(options, 'First parameter');\n    this._countQueuingStrategyHighWaterMark = options.highWaterMark;\n  }\n\n  /**\n   * Returns the high water mark provided to the constructor.\n   */\n  get highWaterMark(): number {\n    if (!IsCountQueuingStrategy(this)) {\n      throw countBrandCheckException('highWaterMark');\n    }\n    return this._countQueuingStrategyHighWaterMark;\n  }\n\n  /**\n   * Measures the size of `chunk` by always returning 1.\n   * This ensures that the total queue size is a count of the number of chunks in the queue.\n   */\n  get size(): (chunk: any) => 1 {\n    if (!IsCountQueuingStrategy(this)) {\n      throw countBrandCheckException('size');\n    }\n    return countSizeFunction;\n  }\n}\n\nObject.defineProperties(CountQueuingStrategy.prototype, {\n  highWaterMark: { enumerable: true },\n  size: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(CountQueuingStrategy.prototype, Symbol.toStringTag, {\n    value: 'CountQueuingStrategy',\n    configurable: true\n  });\n}\n\n// Helper functions for the CountQueuingStrategy.\n\nfunction countBrandCheckException(name: string): TypeError {\n  return new TypeError(`CountQueuingStrategy.prototype.${name} can only be used on a CountQueuingStrategy`);\n}\n\nexport function IsCountQueuingStrategy(x: any): x is CountQueuingStrategy {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_countQueuingStrategyHighWaterMark')) {\n    return false;\n  }\n\n  return x instanceof CountQueuingStrategy;\n}\n","import { assertDictionary, assertFunction } from './basic';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\nimport {\n  Transformer,\n  TransformerFlushCallback,\n  TransformerStartCallback,\n  TransformerTransformCallback,\n  ValidatedTransformer\n} from '../transform-stream/transformer';\nimport { TransformStreamDefaultController } from '../transform-stream';\n\nexport function convertTransformer<I, O>(original: Transformer<I, O> | null,\n                                         context: string): ValidatedTransformer<I, O> {\n  assertDictionary(original, context);\n  const flush = original?.flush;\n  const readableType = original?.readableType;\n  const start = original?.start;\n  const transform = original?.transform;\n  const writableType = original?.writableType;\n  return {\n    flush: flush === undefined ?\n      undefined :\n      convertTransformerFlushCallback(flush, original!, `${context} has member 'flush' that`),\n    readableType,\n    start: start === undefined ?\n      undefined :\n      convertTransformerStartCallback(start, original!, `${context} has member 'start' that`),\n    transform: transform === undefined ?\n      undefined :\n      convertTransformerTransformCallback(transform, original!, `${context} has member 'transform' that`),\n    writableType\n  };\n}\n\nfunction convertTransformerFlushCallback<I, O>(\n  fn: TransformerFlushCallback<O>,\n  original: Transformer<I, O>,\n  context: string\n): (controller: TransformStreamDefaultController<O>) => Promise<void> {\n  assertFunction(fn, context);\n  return (controller: TransformStreamDefaultController<O>) => promiseCall(fn, original, [controller]);\n}\n\nfunction convertTransformerStartCallback<I, O>(\n  fn: TransformerStartCallback<O>,\n  original: Transformer<I, O>,\n  context: string\n): TransformerStartCallback<O> {\n  assertFunction(fn, context);\n  return (controller: TransformStreamDefaultController<O>) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertTransformerTransformCallback<I, O>(\n  fn: TransformerTransformCallback<I, O>,\n  original: Transformer<I, O>,\n  context: string\n): (chunk: I, controller: TransformStreamDefaultController<O>) => Promise<void> {\n  assertFunction(fn, context);\n  return (chunk: I, controller: TransformStreamDefaultController<O>) => promiseCall(fn, original, [chunk, controller]);\n}\n","import assert from '../stub/assert';\nimport { newPromise, promiseRejectedWith, promiseResolvedWith, transformPromiseWith } from './helpers/webidl';\nimport { CreateReadableStream, ReadableStream, ReadableStreamDefaultController } from './readable-stream';\nimport {\n  ReadableStreamDefaultControllerCanCloseOrEnqueue,\n  ReadableStreamDefaultControllerClose,\n  ReadableStreamDefaultControllerEnqueue,\n  ReadableStreamDefaultControllerError,\n  ReadableStreamDefaultControllerGetDesiredSize,\n  ReadableStreamDefaultControllerHasBackpressure\n} from './readable-stream/default-controller';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { CreateWritableStream, WritableStream, WritableStreamDefaultControllerErrorIfNeeded } from './writable-stream';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport {\n  Transformer,\n  TransformerFlushCallback,\n  TransformerStartCallback,\n  TransformerTransformCallback,\n  ValidatedTransformer\n} from './transform-stream/transformer';\nimport { convertTransformer } from './validators/transformer';\n\n// Class TransformStream\n\n/**\n * A transform stream consists of a pair of streams: a {@link WritableStream | writable stream},\n * known as its writable side, and a {@link ReadableStream | readable stream}, known as its readable side.\n * In a manner specific to the transform stream in question, writes to the writable side result in new data being\n * made available for reading from the readable side.\n *\n * @public\n */\nexport class TransformStream<I = any, O = any> {\n  /** @internal */\n  _writable!: WritableStream<I>;\n  /** @internal */\n  _readable!: ReadableStream<O>;\n  /** @internal */\n  _backpressure!: boolean;\n  /** @internal */\n  _backpressureChangePromise!: Promise<void>;\n  /** @internal */\n  _backpressureChangePromise_resolve!: () => void;\n  /** @internal */\n  _transformStreamController!: TransformStreamDefaultController<O>;\n\n  constructor(\n    transformer?: Transformer<I, O>,\n    writableStrategy?: QueuingStrategy<I>,\n    readableStrategy?: QueuingStrategy<O>\n  );\n  constructor(rawTransformer: Transformer<I, O> | null | undefined = {},\n              rawWritableStrategy: QueuingStrategy<I> | null | undefined = {},\n              rawReadableStrategy: QueuingStrategy<O> | null | undefined = {}) {\n    if (rawTransformer === undefined) {\n      rawTransformer = null;\n    }\n\n    const writableStrategy = convertQueuingStrategy(rawWritableStrategy, 'Second parameter');\n    const readableStrategy = convertQueuingStrategy(rawReadableStrategy, 'Third parameter');\n\n    const transformer = convertTransformer(rawTransformer, 'First parameter');\n    if (transformer.readableType !== undefined) {\n      throw new RangeError('Invalid readableType specified');\n    }\n    if (transformer.writableType !== undefined) {\n      throw new RangeError('Invalid writableType specified');\n    }\n\n    const readableHighWaterMark = ExtractHighWaterMark(readableStrategy, 0);\n    const readableSizeAlgorithm = ExtractSizeAlgorithm(readableStrategy);\n    const writableHighWaterMark = ExtractHighWaterMark(writableStrategy, 1);\n    const writableSizeAlgorithm = ExtractSizeAlgorithm(writableStrategy);\n\n    let startPromise_resolve!: (value: void | PromiseLike<void>) => void;\n    const startPromise = newPromise<void>(resolve => {\n      startPromise_resolve = resolve;\n    });\n\n    InitializeTransformStream(\n      this, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm\n    );\n    SetUpTransformStreamDefaultControllerFromTransformer(this, transformer);\n\n    if (transformer.start !== undefined) {\n      startPromise_resolve(transformer.start(this._transformStreamController));\n    } else {\n      startPromise_resolve(undefined);\n    }\n  }\n\n  /**\n   * The readable side of the transform stream.\n   */\n  get readable(): ReadableStream<O> {\n    if (!IsTransformStream(this)) {\n      throw streamBrandCheckException('readable');\n    }\n\n    return this._readable;\n  }\n\n  /**\n   * The writable side of the transform stream.\n   */\n  get writable(): WritableStream<I> {\n    if (!IsTransformStream(this)) {\n      throw streamBrandCheckException('writable');\n    }\n\n    return this._writable;\n  }\n}\n\nObject.defineProperties(TransformStream.prototype, {\n  readable: { enumerable: true },\n  writable: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(TransformStream.prototype, Symbol.toStringTag, {\n    value: 'TransformStream',\n    configurable: true\n  });\n}\n\nexport {\n  Transformer,\n  TransformerStartCallback,\n  TransformerFlushCallback,\n  TransformerTransformCallback\n};\n\n// Transform Stream Abstract Operations\n\nexport function CreateTransformStream<I, O>(startAlgorithm: () => void | PromiseLike<void>,\n                                            transformAlgorithm: (chunk: I) => Promise<void>,\n                                            flushAlgorithm: () => Promise<void>,\n                                            writableHighWaterMark = 1,\n                                            writableSizeAlgorithm: QueuingStrategySizeCallback<I> = () => 1,\n                                            readableHighWaterMark = 0,\n                                            readableSizeAlgorithm: QueuingStrategySizeCallback<O> = () => 1) {\n  assert(IsNonNegativeNumber(writableHighWaterMark));\n  assert(IsNonNegativeNumber(readableHighWaterMark));\n\n  const stream: TransformStream<I, O> = Object.create(TransformStream.prototype);\n\n  let startPromise_resolve!: (value: void | PromiseLike<void>) => void;\n  const startPromise = newPromise<void>(resolve => {\n    startPromise_resolve = resolve;\n  });\n\n  InitializeTransformStream(stream, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark,\n                            readableSizeAlgorithm);\n\n  const controller: TransformStreamDefaultController<O> = Object.create(TransformStreamDefaultController.prototype);\n\n  SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);\n\n  const startResult = startAlgorithm();\n  startPromise_resolve(startResult);\n  return stream;\n}\n\nfunction InitializeTransformStream<I, O>(stream: TransformStream<I, O>,\n                                         startPromise: Promise<void>,\n                                         writableHighWaterMark: number,\n                                         writableSizeAlgorithm: QueuingStrategySizeCallback<I>,\n                                         readableHighWaterMark: number,\n                                         readableSizeAlgorithm: QueuingStrategySizeCallback<O>) {\n  function startAlgorithm(): Promise<void> {\n    return startPromise;\n  }\n\n  function writeAlgorithm(chunk: I): Promise<void> {\n    return TransformStreamDefaultSinkWriteAlgorithm(stream, chunk);\n  }\n\n  function abortAlgorithm(reason: any): Promise<void> {\n    return TransformStreamDefaultSinkAbortAlgorithm(stream, reason);\n  }\n\n  function closeAlgorithm(): Promise<void> {\n    return TransformStreamDefaultSinkCloseAlgorithm(stream);\n  }\n\n  stream._writable = CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm,\n                                          writableHighWaterMark, writableSizeAlgorithm);\n\n  function pullAlgorithm(): Promise<void> {\n    return TransformStreamDefaultSourcePullAlgorithm(stream);\n  }\n\n  function cancelAlgorithm(reason: any): Promise<void> {\n    TransformStreamErrorWritableAndUnblockWrite(stream, reason);\n    return promiseResolvedWith(undefined);\n  }\n\n  stream._readable = CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, readableHighWaterMark,\n                                          readableSizeAlgorithm);\n\n  // The [[backpressure]] slot is set to undefined so that it can be initialised by TransformStreamSetBackpressure.\n  stream._backpressure = undefined!;\n  stream._backpressureChangePromise = undefined!;\n  stream._backpressureChangePromise_resolve = undefined!;\n  TransformStreamSetBackpressure(stream, true);\n\n  stream._transformStreamController = undefined!;\n}\n\nfunction IsTransformStream(x: unknown): x is TransformStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_transformStreamController')) {\n    return false;\n  }\n\n  return x instanceof TransformStream;\n}\n\n// This is a no-op if both sides are already errored.\nfunction TransformStreamError(stream: TransformStream, e: any) {\n  ReadableStreamDefaultControllerError(\n    stream._readable._readableStreamController as ReadableStreamDefaultController<any>,\n    e\n  );\n  TransformStreamErrorWritableAndUnblockWrite(stream, e);\n}\n\nfunction TransformStreamErrorWritableAndUnblockWrite(stream: TransformStream, e: any) {\n  TransformStreamDefaultControllerClearAlgorithms(stream._transformStreamController);\n  WritableStreamDefaultControllerErrorIfNeeded(stream._writable._writableStreamController, e);\n  if (stream._backpressure) {\n    // Pretend that pull() was called to permit any pending write() calls to complete. TransformStreamSetBackpressure()\n    // cannot be called from enqueue() or pull() once the ReadableStream is errored, so this will will be the final time\n    // _backpressure is set.\n    TransformStreamSetBackpressure(stream, false);\n  }\n}\n\nfunction TransformStreamSetBackpressure(stream: TransformStream, backpressure: boolean) {\n  // Passes also when called during construction.\n  assert(stream._backpressure !== backpressure);\n\n  if (stream._backpressureChangePromise !== undefined) {\n    stream._backpressureChangePromise_resolve();\n  }\n\n  stream._backpressureChangePromise = newPromise(resolve => {\n    stream._backpressureChangePromise_resolve = resolve;\n  });\n\n  stream._backpressure = backpressure;\n}\n\n// Class TransformStreamDefaultController\n\n/**\n * Allows control of the {@link ReadableStream} and {@link WritableStream} of the associated {@link TransformStream}.\n *\n * @public\n */\nexport class TransformStreamDefaultController<O> {\n  /** @internal */\n  _controlledTransformStream: TransformStream<any, O>;\n  /** @internal */\n  _transformAlgorithm: (chunk: any) => Promise<void>;\n  /** @internal */\n  _flushAlgorithm: () => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the desired size to fill the readable side’s internal queue. It can be negative, if the queue is over-full.\n   */\n  get desiredSize(): number | null {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('desiredSize');\n    }\n\n    const readableController = this._controlledTransformStream._readable._readableStreamController;\n    return ReadableStreamDefaultControllerGetDesiredSize(readableController as ReadableStreamDefaultController<O>);\n  }\n\n  /**\n   * Enqueues the given chunk `chunk` in the readable side of the controlled transform stream.\n   */\n  enqueue(chunk: O): void;\n  enqueue(chunk: O = undefined!): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('enqueue');\n    }\n\n    TransformStreamDefaultControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors both the readable side and the writable side of the controlled transform stream, making all future\n   * interactions with it fail with the given error `e`. Any chunks queued for transformation will be discarded.\n   */\n  error(reason: any = undefined): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n\n    TransformStreamDefaultControllerError(this, reason);\n  }\n\n  /**\n   * Closes the readable side and errors the writable side of the controlled transform stream. This is useful when the\n   * transformer only needs to consume a portion of the chunks written to the writable side.\n   */\n  terminate(): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('terminate');\n    }\n\n    TransformStreamDefaultControllerTerminate(this);\n  }\n}\n\nObject.defineProperties(TransformStreamDefaultController.prototype, {\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  terminate: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(TransformStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'TransformStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Transform Stream Default Controller Abstract Operations\n\nfunction IsTransformStreamDefaultController<O = any>(x: any): x is TransformStreamDefaultController<O> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledTransformStream')) {\n    return false;\n  }\n\n  return x instanceof TransformStreamDefaultController;\n}\n\nfunction SetUpTransformStreamDefaultController<I, O>(stream: TransformStream<I, O>,\n                                                     controller: TransformStreamDefaultController<O>,\n                                                     transformAlgorithm: (chunk: I) => Promise<void>,\n                                                     flushAlgorithm: () => Promise<void>) {\n  assert(IsTransformStream(stream));\n  assert(stream._transformStreamController === undefined);\n\n  controller._controlledTransformStream = stream;\n  stream._transformStreamController = controller;\n\n  controller._transformAlgorithm = transformAlgorithm;\n  controller._flushAlgorithm = flushAlgorithm;\n}\n\nfunction SetUpTransformStreamDefaultControllerFromTransformer<I, O>(stream: TransformStream<I, O>,\n                                                                    transformer: ValidatedTransformer<I, O>) {\n  const controller: TransformStreamDefaultController<O> = Object.create(TransformStreamDefaultController.prototype);\n\n  let transformAlgorithm = (chunk: I): Promise<void> => {\n    try {\n      TransformStreamDefaultControllerEnqueue(controller, chunk as unknown as O);\n      return promiseResolvedWith(undefined);\n    } catch (transformResultE) {\n      return promiseRejectedWith(transformResultE);\n    }\n  };\n\n  let flushAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (transformer.transform !== undefined) {\n    transformAlgorithm = chunk => transformer.transform!(chunk, controller);\n  }\n  if (transformer.flush !== undefined) {\n    flushAlgorithm = () => transformer.flush!(controller);\n  }\n\n  SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);\n}\n\nfunction TransformStreamDefaultControllerClearAlgorithms(controller: TransformStreamDefaultController<any>) {\n  controller._transformAlgorithm = undefined!;\n  controller._flushAlgorithm = undefined!;\n}\n\nfunction TransformStreamDefaultControllerEnqueue<O>(controller: TransformStreamDefaultController<O>, chunk: O) {\n  const stream = controller._controlledTransformStream;\n  const readableController = stream._readable._readableStreamController as ReadableStreamDefaultController<O>;\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(readableController)) {\n    throw new TypeError('Readable side is not in a state that permits enqueue');\n  }\n\n  // We throttle transform invocations based on the backpressure of the ReadableStream, but we still\n  // accept TransformStreamDefaultControllerEnqueue() calls.\n\n  try {\n    ReadableStreamDefaultControllerEnqueue(readableController, chunk);\n  } catch (e) {\n    // This happens when readableStrategy.size() throws.\n    TransformStreamErrorWritableAndUnblockWrite(stream, e);\n\n    throw stream._readable._storedError;\n  }\n\n  const backpressure = ReadableStreamDefaultControllerHasBackpressure(readableController);\n  if (backpressure !== stream._backpressure) {\n    assert(backpressure);\n    TransformStreamSetBackpressure(stream, true);\n  }\n}\n\nfunction TransformStreamDefaultControllerError(controller: TransformStreamDefaultController<any>, e: any) {\n  TransformStreamError(controller._controlledTransformStream, e);\n}\n\nfunction TransformStreamDefaultControllerPerformTransform<I, O>(controller: TransformStreamDefaultController<O>,\n                                                                chunk: I) {\n  const transformPromise = controller._transformAlgorithm(chunk);\n  return transformPromiseWith(transformPromise, undefined, r => {\n    TransformStreamError(controller._controlledTransformStream, r);\n    throw r;\n  });\n}\n\nfunction TransformStreamDefaultControllerTerminate<O>(controller: TransformStreamDefaultController<O>) {\n  const stream = controller._controlledTransformStream;\n  const readableController = stream._readable._readableStreamController as ReadableStreamDefaultController<O>;\n\n  ReadableStreamDefaultControllerClose(readableController);\n\n  const error = new TypeError('TransformStream terminated');\n  TransformStreamErrorWritableAndUnblockWrite(stream, error);\n}\n\n// TransformStreamDefaultSink Algorithms\n\nfunction TransformStreamDefaultSinkWriteAlgorithm<I, O>(stream: TransformStream<I, O>, chunk: I): Promise<void> {\n  assert(stream._writable._state === 'writable');\n\n  const controller = stream._transformStreamController;\n\n  if (stream._backpressure) {\n    const backpressureChangePromise = stream._backpressureChangePromise;\n    assert(backpressureChangePromise !== undefined);\n    return transformPromiseWith(backpressureChangePromise, () => {\n      const writable = stream._writable;\n      const state = writable._state;\n      if (state === 'erroring') {\n        throw writable._storedError;\n      }\n      assert(state === 'writable');\n      return TransformStreamDefaultControllerPerformTransform<I, O>(controller, chunk);\n    });\n  }\n\n  return TransformStreamDefaultControllerPerformTransform<I, O>(controller, chunk);\n}\n\nfunction TransformStreamDefaultSinkAbortAlgorithm(stream: TransformStream, reason: any): Promise<void> {\n  // abort() is not called synchronously, so it is possible for abort() to be called when the stream is already\n  // errored.\n  TransformStreamError(stream, reason);\n  return promiseResolvedWith(undefined);\n}\n\nfunction TransformStreamDefaultSinkCloseAlgorithm<I, O>(stream: TransformStream<I, O>): Promise<void> {\n  // stream._readable cannot change after construction, so caching it across a call to user code is safe.\n  const readable = stream._readable;\n\n  const controller = stream._transformStreamController;\n  const flushPromise = controller._flushAlgorithm();\n  TransformStreamDefaultControllerClearAlgorithms(controller);\n\n  // Return a promise that is fulfilled with undefined on success.\n  return transformPromiseWith(flushPromise, () => {\n    if (readable._state === 'errored') {\n      throw readable._storedError;\n    }\n    ReadableStreamDefaultControllerClose(readable._readableStreamController as ReadableStreamDefaultController<O>);\n  }, r => {\n    TransformStreamError(stream, r);\n    throw readable._storedError;\n  });\n}\n\n// TransformStreamDefaultSource Algorithms\n\nfunction TransformStreamDefaultSourcePullAlgorithm(stream: TransformStream): Promise<void> {\n  // Invariant. Enforced by the promises returned by start() and pull().\n  assert(stream._backpressure);\n\n  assert(stream._backpressureChangePromise !== undefined);\n\n  TransformStreamSetBackpressure(stream, false);\n\n  // Prevent the next pull() call until there is backpressure.\n  return stream._backpressureChangePromise;\n}\n\n// Helper functions for the TransformStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `TransformStreamDefaultController.prototype.${name} can only be used on a TransformStreamDefaultController`);\n}\n\n// Helper functions for the TransformStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `TransformStream.prototype.${name} can only be used on a TransformStream`);\n}\n","import {\n  ByteLengthQueuingStrategy,\n  CountQueuingStrategy,\n  ReadableByteStreamController,\n  ReadableStream,\n  ReadableStreamBYOBReader,\n  ReadableStreamBYOBRequest,\n  ReadableStreamDefaultController,\n  ReadableStreamDefaultReader,\n  TransformStream,\n  TransformStreamDefaultController,\n  WritableStream,\n  WritableStreamDefaultController,\n  WritableStreamDefaultWriter\n} from './ponyfill';\nimport { globals } from './utils';\n\n// Export\nexport * from './ponyfill';\n\nconst exports = {\n  ReadableStream,\n  ReadableStreamDefaultController,\n  ReadableByteStreamController,\n  ReadableStreamBYOBRequest,\n  ReadableStreamDefaultReader,\n  ReadableStreamBYOBReader,\n\n  WritableStream,\n  WritableStreamDefaultController,\n  WritableStreamDefaultWriter,\n\n  ByteLengthQueuingStrategy,\n  CountQueuingStrategy,\n\n  TransformStream,\n  TransformStreamDefaultController\n};\n\n// Add classes to global scope\nif (typeof globals !== 'undefined') {\n  for (const prop in exports) {\n    if (Object.prototype.hasOwnProperty.call(exports, prop)) {\n      Object.defineProperty(globals, prop, {\n        value: exports[prop as (keyof typeof exports)],\n        writable: true,\n        configurable: true\n      });\n    }\n  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diff --git a/node_modules/web-streams-polyfill/dist/polyfill.es2018.min.js b/node_modules/web-streams-polyfill/dist/polyfill.es2018.min.js
new file mode 100644
index 0000000..725d242
--- /dev/null
+++ b/node_modules/web-streams-polyfill/dist/polyfill.es2018.min.js
@@ -0,0 +1,2 @@
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f(Z("read"));if(void 0===this._ownerReadableStream)return f(P("read from"));let e,t;const r=c(((r,o)=>{e=r,t=o}));return K(this,{_chunkSteps:t=>e({value:t,done:!1}),_closeSteps:()=>e({value:void 0,done:!0}),_errorSteps:e=>t(e)}),r}releaseLock(){if(!J(this))throw Z("releaseLock");if(void 0!==this._ownerReadableStream){if(this._readRequests.length>0)throw new TypeError("Tried to release a reader lock when that reader has pending read() calls un-settled");C(this)}}}function J(e){return!!n(e)&&(!!Object.prototype.hasOwnProperty.call(e,"_readRequests")&&e instanceof ReadableStreamDefaultReader)}function K(e,t){const r=e._ownerReadableStream;r._disturbed=!0,"closed"===r._state?t._closeSteps():"errored"===r._state?t._errorSteps(r._storedError):r._readableStreamController[A](t)}function Z(e){return new TypeError(`ReadableStreamDefaultReader.prototype.${e} can only be used on a 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K(e,{_chunkSteps:e=>{this._ongoingPromise=void 0,g((()=>t({value:e,done:!1})))},_closeSteps:()=>{this._ongoingPromise=void 0,this._isFinished=!0,C(e),t({value:void 0,done:!0})},_errorSteps:t=>{this._ongoingPromise=void 0,this._isFinished=!0,C(e),r(t)}}),o}_returnSteps(e){if(this._isFinished)return Promise.resolve({value:e,done:!0});this._isFinished=!0;const t=this._reader;if(void 0===t._ownerReadableStream)return f(P("finish iterating"));if(!this._preventCancel){const r=T(t,e);return C(t),p(r,(()=>({value:e,done:!0})))}return C(t),d({value:e,done:!0})}}const re={next(){return oe(this)?this._asyncIteratorImpl.next():f(ne("next"))},return(e){return oe(this)?this._asyncIteratorImpl.return(e):f(ne("return"))}};function oe(e){if(!n(e))return!1;if(!Object.prototype.hasOwnProperty.call(e,"_asyncIteratorImpl"))return!1;try{return e._asyncIteratorImpl instanceof te}catch(e){return!1}}function ne(e){return new TypeError(`ReadableStreamAsyncIterator.${e} can only be used on a 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r=e._pendingPullIntos.peek();Re(e);"closed"===e._controlledReadableByteStream._state?function(e,t){const r=e._controlledReadableByteStream;if(Me(r))for(;$e(r)>0;)pe(r,Pe(e))}(e):function(e,t,r){if(ve(0,t,r),r.bytesFilled<r.elementSize)return;Pe(e);const o=r.bytesFilled%r.elementSize;if(o>0){const t=r.byteOffset+r.bytesFilled,n=se(r.buffer,t-o,t);ge(e,n,0,n.byteLength)}r.bytesFilled-=o,pe(e._controlledReadableByteStream,r),Te(e)}(e,t,r),_e(e)}function Pe(e){return e._pendingPullIntos.shift()}function qe(e){e._pullAlgorithm=void 0,e._cancelAlgorithm=void 0}function Ee(e){const t=e._controlledReadableByteStream;if(!e._closeRequested&&"readable"===t._state)if(e._queueTotalSize>0)e._closeRequested=!0;else{if(e._pendingPullIntos.length>0){if(e._pendingPullIntos.peek().bytesFilled>0){const t=new TypeError("Insufficient bytes to fill elements in the given buffer");throw Oe(e,t),t}}qe(e),hr(t)}}function We(e,t){const 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je(e,t){const r=e._pendingPullIntos.peek();if("closed"===e._controlledReadableByteStream._state){if(0!==t)throw new TypeError("bytesWritten must be 0 when calling respond() on a closed stream")}else{if(0===t)throw new TypeError("bytesWritten must be greater than 0 when calling respond() on a readable stream");if(r.bytesFilled+t>r.byteLength)throw new RangeError("bytesWritten out of range")}r.buffer=r.buffer,Ce(e,t)}function Ae(e,t){const r=e._pendingPullIntos.peek();if("closed"===e._controlledReadableByteStream._state){if(0!==t.byteLength)throw new TypeError("The view's length must be 0 when calling respondWithNewView() on a closed stream")}else if(0===t.byteLength)throw new TypeError("The view's length must be greater than 0 when calling respondWithNewView() on a readable stream");if(r.byteOffset+r.bytesFilled!==t.byteOffset)throw new RangeError("The region specified by view does not match byobRequest");if(r.bufferByteLength!==t.buffer.byteLength)throw new RangeError("The buffer of 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e._reader._readIntoRequests.length}function Me(e){const t=e._reader;return void 0!==t&&!!Qe(t)}Object.defineProperties(ReadableByteStreamController.prototype,{close:{enumerable:!0},enqueue:{enumerable:!0},error:{enumerable:!0},byobRequest:{enumerable:!0},desiredSize:{enumerable:!0}}),"symbol"==typeof t.toStringTag&&Object.defineProperty(ReadableByteStreamController.prototype,t.toStringTag,{value:"ReadableByteStreamController",configurable:!0});class ReadableStreamBYOBReader{constructor(e){if($(e,1,"ReadableStreamBYOBReader"),N(e,"First parameter"),fr(e))throw new TypeError("This stream has already been locked for exclusive reading by another reader");if(!be(e._readableStreamController))throw new TypeError("Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte source");R(this,e),this._readIntoRequests=new w}get closed(){return Qe(this)?this._closedPromise:f(xe("closed"))}cancel(e){return Qe(this)?void 0===this._ownerReadableStream?f(P("cancel")):T(this,e):f(xe("cancel"))}read(e){if(!Qe(this))return f(xe("read"));if(!ArrayBuffer.isView(e))return f(new TypeError("view must be an array buffer view"));if(0===e.byteLength)return f(new TypeError("view must have non-zero byteLength"));if(0===e.buffer.byteLength)return f(new TypeError("view's buffer must have non-zero byteLength"));if(e.buffer,void 0===this._ownerReadableStream)return f(P("read from"));let t,r;const o=c(((e,o)=>{t=e,r=o}));return Ye(this,e,{_chunkSteps:e=>t({value:e,done:!1}),_closeSteps:e=>t({value:e,done:!0}),_errorSteps:e=>r(e)}),o}releaseLock(){if(!Qe(this))throw xe("releaseLock");if(void 0!==this._ownerReadableStream){if(this._readIntoRequests.length>0)throw new TypeError("Tried to release a reader lock when that reader has pending read() calls un-settled");C(this)}}}function Qe(e){return!!n(e)&&(!!Object.prototype.hasOwnProperty.call(e,"_readIntoRequests")&&e instanceof ReadableStreamBYOBReader)}function Ye(e,t,r){const o=e._ownerReadableStream;o._disturbed=!0,"errored"===o._state?r._errorSteps(o._storedError):function(e,t,r){const o=e._controlledReadableByteStream;let n=1;t.constructor!==DataView&&(n=t.constructor.BYTES_PER_ELEMENT);const a=t.constructor,i=t.buffer,l={buffer:i,bufferByteLength:i.byteLength,byteOffset:t.byteOffset,byteLength:t.byteLength,bytesFilled:0,elementSize:n,viewConstructor:a,readerType:"byob"};if(e._pendingPullIntos.length>0)return e._pendingPullIntos.push(l),void Ie(o,r);if("closed"!==o._state){if(e._queueTotalSize>0){if(Se(e,l)){const t=ye(l);return we(e),void r._chunkSteps(t)}if(e._closeRequested){const t=new TypeError("Insufficient bytes to fill elements in the given buffer");return Oe(e,t),void r._errorSteps(t)}}e._pendingPullIntos.push(l),Ie(o,r),_e(e)}else{const e=new a(l.buffer,l.byteOffset,0);r._closeSteps(e)}}(o._readableStreamController,t,r)}function xe(e){return new TypeError(`ReadableStreamBYOBReader.prototype.${e} can only be used on a 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t.toStringTag&&Object.defineProperty(ReadableStreamBYOBReader.prototype,t.toStringTag,{value:"ReadableStreamBYOBReader",configurable:!0});const et="function"==typeof AbortController;class WritableStream{constructor(e={},t={}){void 0===e?e=null:I(e,"First parameter");const r=Ve(t,"Second parameter"),o=function(e,t){L(e,t);const r=null==e?void 0:e.abort,o=null==e?void 0:e.close,n=null==e?void 0:e.start,a=null==e?void 0:e.type,i=null==e?void 0:e.write;return{abort:void 0===r?void 0:Ge(r,e,`${t} has member 'abort' that`),close:void 0===o?void 0:Xe(o,e,`${t} has member 'close' that`),start:void 0===n?void 0:Je(n,e,`${t} has member 'start' that`),write:void 0===i?void 0:Ke(i,e,`${t} has member 'write' that`),type:a}}(e,"First parameter");rt(this);if(void 0!==o.type)throw new RangeError("Invalid type is specified");const n=He(r);!function(e,t,r,o){const n=Object.create(WritableStreamDefaultController.prototype);let a=()=>{},i=()=>d(void 0),l=()=>d(void 0),s=()=>d(void 0);void 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ot(e){return!!n(e)&&(!!Object.prototype.hasOwnProperty.call(e,"_writableStreamController")&&e instanceof WritableStream)}function nt(e){return void 0!==e._writer}function at(e,t){var r;if("closed"===e._state||"errored"===e._state)return d(void 0);e._writableStreamController._abortReason=t,null===(r=e._writableStreamController._abortController)||void 0===r||r.abort();const o=e._state;if("closed"===o||"errored"===o)return d(void 0);if(void 0!==e._pendingAbortRequest)return e._pendingAbortRequest._promise;let n=!1;"erroring"===o&&(n=!0,t=void 0);const a=c(((r,o)=>{e._pendingAbortRequest={_promise:void 0,_resolve:r,_reject:o,_reason:t,_wasAlreadyErroring:n}}));return e._pendingAbortRequest._promise=a,n||st(e,t),a}function it(e){const t=e._state;if("closed"===t||"errored"===t)return f(new TypeError(`The stream (in ${t} state) is not in the writable state and cannot be closed`));const r=c(((t,r)=>{const o={_resolve:t,_reject:r};e._closeRequest=o})),o=e._writer;var n;return void 0!==o&&e._backpressure&&"writable"===t&&$t(o),de(n=e._writableStreamController,gt,0),Tt(n),r}function lt(e,t){"writable"!==e._state?ut(e):st(e,t)}function st(e,t){const r=e._writableStreamController;e._state="erroring",e._storedError=t;const o=e._writer;void 0!==o&&mt(o,t),!function(e){if(void 0===e._inFlightWriteRequest&&void 0===e._inFlightCloseRequest)return!1;return!0}(e)&&r._started&&ut(e)}function ut(e){e._state="errored",e._writableStreamController[k]();const t=e._storedError;if(e._writeRequests.forEach((e=>{e._reject(t)})),e._writeRequests=new w,void 0===e._pendingAbortRequest)return void dt(e);const r=e._pendingAbortRequest;if(e._pendingAbortRequest=void 0,r._wasAlreadyErroring)return r._reject(t),void dt(e);h(e._writableStreamController[B](r._reason),(()=>{r._resolve(),dt(e)}),(t=>{r._reject(t),dt(e)}))}function ct(e){return void 0!==e._closeRequest||void 0!==e._inFlightCloseRequest}function dt(e){void 0!==e._closeRequest&&(e._closeRequest._reject(e._storedError),e._closeRequest=void 0);const t=e._writer;void 0!==t&&At(t,e._storedError)}function ft(e,t){const r=e._writer;void 0!==r&&t!==e._backpressure&&(t?function(e){Dt(e)}(r):$t(r)),e._backpressure=t}Object.defineProperties(WritableStream.prototype,{abort:{enumerable:!0},close:{enumerable:!0},getWriter:{enumerable:!0},locked:{enumerable:!0}}),"symbol"==typeof t.toStringTag&&Object.defineProperty(WritableStream.prototype,t.toStringTag,{value:"WritableStream",configurable:!0});class WritableStreamDefaultWriter{constructor(e){if($(e,1,"WritableStreamDefaultWriter"),Ze(e,"First parameter"),nt(e))throw new TypeError("This stream has already been locked for exclusive writing by another writer");this._ownerWritableStream=e,e._writer=this;const t=e._state;if("writable"===t)!ct(e)&&e._backpressure?Dt(this):Ft(this),kt(this);else if("erroring"===t)Lt(this,e._storedError),kt(this);else if("closed"===t)Ft(this),kt(r=this),zt(r);else{const t=e._storedError;Lt(this,t),jt(this,t)}var r}get closed(){return bt(this)?this._closedPromise:f(Ot("closed"))}get desiredSize(){if(!bt(this))throw Ot("desiredSize");if(void 0===this._ownerWritableStream)throw Bt("desiredSize");return function(e){const t=e._ownerWritableStream,r=t._state;if("errored"===r||"erroring"===r)return null;if("closed"===r)return 0;return Rt(t._writableStreamController)}(this)}get ready(){return bt(this)?this._readyPromise:f(Ot("ready"))}abort(e){return bt(this)?void 0===this._ownerWritableStream?f(Bt("abort")):function(e,t){return at(e._ownerWritableStream,t)}(this,e):f(Ot("abort"))}close(){if(!bt(this))return f(Ot("close"));const e=this._ownerWritableStream;return void 0===e?f(Bt("close")):ct(e)?f(new TypeError("Cannot close an already-closing stream")):ht(this)}releaseLock(){if(!bt(this))throw Ot("releaseLock");void 0!==this._ownerWritableStream&&pt(this)}write(e){return bt(this)?void 0===this._ownerWritableStream?f(Bt("write to")):yt(this,e):f(Ot("write"))}}function bt(e){return!!n(e)&&(!!Object.prototype.hasOwnProperty.call(e,"_ownerWritableStream")&&e instanceof WritableStreamDefaultWriter)}function ht(e){return it(e._ownerWritableStream)}function _t(e,t){"pending"===e._closedPromiseState?At(e,t):function(e,t){jt(e,t)}(e,t)}function mt(e,t){"pending"===e._readyPromiseState?It(e,t):function(e,t){Lt(e,t)}(e,t)}function pt(e){const t=e._ownerWritableStream,r=new TypeError("Writer was released and can no longer be used to monitor the stream's closedness");mt(e,r),_t(e,r),t._writer=void 0,e._ownerWritableStream=void 0}function yt(e,t){const r=e._ownerWritableStream,o=r._writableStreamController,n=function(e,t){try{return e._strategySizeAlgorithm(t)}catch(t){return Ct(e,t),1}}(o,t);if(r!==e._ownerWritableStream)return f(Bt("write to"));const a=r._state;if("errored"===a)return f(r._storedError);if(ct(r)||"closed"===a)return f(new TypeError("The stream is closing or closed and cannot be written to"));if("erroring"===a)return f(r._storedError);const i=function(e){return c(((t,r)=>{const o={_resolve:t,_reject:r};e._writeRequests.push(o)}))}(r);return function(e,t,r){try{de(e,t,r)}catch(t){return void Ct(e,t)}const o=e._controlledWritableStream;if(!ct(o)&&"writable"===o._state){ft(o,Pt(e))}Tt(e)}(o,t,n),i}Object.defineProperties(WritableStreamDefaultWriter.prototype,{abort:{enumerable:!0},close:{enumerable:!0},releaseLock:{enumerable:!0},write:{enumerable:!0},closed:{enumerable:!0},desiredSize:{enumerable:!0},ready:{enumerable:!0}}),"symbol"==typeof t.toStringTag&&Object.defineProperty(WritableStreamDefaultWriter.prototype,t.toStringTag,{value:"WritableStreamDefaultWriter",configurable:!0});const gt={};class WritableStreamDefaultController{constructor(){throw new TypeError("Illegal constructor")}get abortReason(){if(!St(this))throw Wt("abortReason");return this._abortReason}get signal(){if(!St(this))throw Wt("signal");if(void 0===this._abortController)throw new TypeError("WritableStreamDefaultController.prototype.signal is not supported");return this._abortController.signal}error(e){if(!St(this))throw Wt("error");"writable"===this._controlledWritableStream._state&&qt(this,e)}[B](e){const t=this._abortAlgorithm(e);return wt(this),t}[k](){fe(this)}}function St(e){return!!n(e)&&(!!Object.prototype.hasOwnProperty.call(e,"_controlledWritableStream")&&e instanceof WritableStreamDefaultController)}function vt(e,t,r,o,n,a,i,l){t._controlledWritableStream=e,e._writableStreamController=t,t._queue=void 0,t._queueTotalSize=void 0,fe(t),t._abortReason=void 0,t._abortController=function(){if(et)return new AbortController}(),t._started=!1,t._strategySizeAlgorithm=l,t._strategyHWM=i,t._writeAlgorithm=o,t._closeAlgorithm=n,t._abortAlgorithm=a;const s=Pt(t);ft(e,s);h(d(r()),(()=>{t._started=!0,Tt(t)}),(r=>{t._started=!0,lt(e,r)}))}function wt(e){e._writeAlgorithm=void 0,e._closeAlgorithm=void 0,e._abortAlgorithm=void 0,e._strategySizeAlgorithm=void 0}function Rt(e){return e._strategyHWM-e._queueTotalSize}function Tt(e){const t=e._controlledWritableStream;if(!e._started)return;if(void 0!==t._inFlightWriteRequest)return;if("erroring"===t._state)return void ut(t);if(0===e._queue.length)return;const r=e._queue.peek().value;r===gt?function(e){const t=e._controlledWritableStream;(function(e){e._inFlightCloseRequest=e._closeRequest,e._closeRequest=void 0})(t),ce(e);const r=e._closeAlgorithm();wt(e),h(r,(()=>{!function(e){e._inFlightCloseRequest._resolve(void 0),e._inFlightCloseRequest=void 0,"erroring"===e._state&&(e._storedError=void 0,void 0!==e._pendingAbortRequest&&(e._pendingAbortRequest._resolve(),e._pendingAbortRequest=void 0)),e._state="closed";const t=e._writer;void 0!==t&&zt(t)}(t)}),(e=>{!function(e,t){e._inFlightCloseRequest._reject(t),e._inFlightCloseRequest=void 0,void 0!==e._pendingAbortRequest&&(e._pendingAbortRequest._reject(t),e._pendingAbortRequest=void 0),lt(e,t)}(t,e)}))}(e):function(e,t){const r=e._controlledWritableStream;!function(e){e._inFlightWriteRequest=e._writeRequests.shift()}(r);h(e._writeAlgorithm(t),(()=>{!function(e){e._inFlightWriteRequest._resolve(void 0),e._inFlightWriteRequest=void 0}(r);const t=r._state;if(ce(e),!ct(r)&&"writable"===t){const t=Pt(e);ft(r,t)}Tt(e)}),(t=>{"writable"===r._state&&wt(e),function(e,t){e._inFlightWriteRequest._reject(t),e._inFlightWriteRequest=void 0,lt(e,t)}(r,t)}))}(e,r)}function Ct(e,t){"writable"===e._controlledWritableStream._state&&qt(e,t)}function Pt(e){return Rt(e)<=0}function qt(e,t){const r=e._controlledWritableStream;wt(e),st(r,t)}function Et(e){return new TypeError(`WritableStream.prototype.${e} can only be used on a WritableStream`)}function Wt(e){return new TypeError(`WritableStreamDefaultController.prototype.${e} can only be used on a WritableStreamDefaultController`)}function Ot(e){return new TypeError(`WritableStreamDefaultWriter.prototype.${e} can only be used on a WritableStreamDefaultWriter`)}function Bt(e){return new TypeError("Cannot "+e+" a stream using a released writer")}function kt(e){e._closedPromise=c(((t,r)=>{e._closedPromise_resolve=t,e._closedPromise_reject=r,e._closedPromiseState="pending"}))}function jt(e,t){kt(e),At(e,t)}function At(e,t){void 0!==e._closedPromise_reject&&(y(e._closedPromise),e._closedPromise_reject(t),e._closedPromise_resolve=void 0,e._closedPromise_reject=void 0,e._closedPromiseState="rejected")}function zt(e){void 0!==e._closedPromise_resolve&&(e._closedPromise_resolve(void 0),e._closedPromise_resolve=void 0,e._closedPromise_reject=void 0,e._closedPromiseState="resolved")}function Dt(e){e._readyPromise=c(((t,r)=>{e._readyPromise_resolve=t,e._readyPromise_reject=r})),e._readyPromiseState="pending"}function Lt(e,t){Dt(e),It(e,t)}function Ft(e){Dt(e),$t(e)}function It(e,t){void 0!==e._readyPromise_reject&&(y(e._readyPromise),e._readyPromise_reject(t),e._readyPromise_resolve=void 0,e._readyPromise_reject=void 0,e._readyPromiseState="rejected")}function $t(e){void 0!==e._readyPromise_resolve&&(e._readyPromise_resolve(void 0),e._readyPromise_resolve=void 0,e._readyPromise_reject=void 0,e._readyPromiseState="fulfilled")}Object.defineProperties(WritableStreamDefaultController.prototype,{abortReason:{enumerable:!0},signal:{enumerable:!0},error:{enumerable:!0}}),"symbol"==typeof t.toStringTag&&Object.defineProperty(WritableStreamDefaultController.prototype,t.toStringTag,{value:"WritableStreamDefaultController",configurable:!0});const Mt="undefined"!=typeof DOMException?DOMException:void 0;const Qt=function(e){if("function"!=typeof e&&"object"!=typeof e)return!1;try{return new e,!0}catch(e){return!1}}(Mt)?Mt:function(){const e=function(e,t){this.message=e||"",this.name=t||"Error",Error.captureStackTrace&&Error.captureStackTrace(this,this.constructor)};return e.prototype=Object.create(Error.prototype),Object.defineProperty(e.prototype,"constructor",{value:e,writable:!0,configurable:!0}),e}();function Yt(e,t,o,n,a,i){const l=H(e),s=tt(t);e._disturbed=!0;let u=!1,p=d(void 0);return c(((g,S)=>{let v;if(void 0!==i){if(v=()=>{const r=new Qt("Aborted","AbortError"),o=[];n||o.push((()=>"writable"===t._state?at(t,r):d(void 0))),a||o.push((()=>"readable"===e._state?br(e,r):d(void 0))),E((()=>Promise.all(o.map((e=>e())))),!0,r)},i.aborted)return void v();i.addEventListener("abort",v)}var w,R,T;if(q(e,l._closedPromise,(e=>{n?W(!0,e):E((()=>at(t,e)),!0,e)})),q(t,s._closedPromise,(t=>{a?W(!0,t):E((()=>br(e,t)),!0,t)})),w=e,R=l._closedPromise,T=()=>{o?W():E((()=>function(e){const t=e._ownerWritableStream,r=t._state;return ct(t)||"closed"===r?d(void 0):"errored"===r?f(t._storedError):ht(e)}(s)))},"closed"===w._state?T():_(R,T),ct(t)||"closed"===t._state){const t=new TypeError("the destination writable stream closed before all data could be piped to it");a?W(!0,t):E((()=>br(e,t)),!0,t)}function P(){const e=p;return b(p,(()=>e!==p?P():void 0))}function q(e,t,r){"errored"===e._state?r(e._storedError):m(t,r)}function E(e,r,o){function n(){h(e(),(()=>O(r,o)),(e=>O(!0,e)))}u||(u=!0,"writable"!==t._state||ct(t)?n():_(P(),n))}function W(e,r){u||(u=!0,"writable"!==t._state||ct(t)?O(e,r):_(P(),(()=>O(e,r))))}function O(e,t){pt(s),C(l),void 0!==i&&i.removeEventListener("abort",v),e?S(t):g(void 0)}y(c(((e,t)=>{!function o(n){n?e():b(u?d(!0):b(s._readyPromise,(()=>c(((e,t)=>{K(l,{_chunkSteps:t=>{p=b(yt(s,t),void 0,r),e(!1)},_closeSteps:()=>e(!0),_errorSteps:t})})))),o,t)}(!1)})))}))}class ReadableStreamDefaultController{constructor(){throw new TypeError("Illegal constructor")}get desiredSize(){if(!xt(this))throw er("desiredSize");return Jt(this)}close(){if(!xt(this))throw er("close");if(!Kt(this))throw new TypeError("The stream is not in a state that permits close");Ut(this)}enqueue(e){if(!xt(this))throw er("enqueue");if(!Kt(this))throw new TypeError("The stream is not in a state that permits enqueue");return Gt(this,e)}error(e){if(!xt(this))throw er("error");Xt(this,e)}[j](e){fe(this);const t=this._cancelAlgorithm(e);return Vt(this),t}[A](e){const t=this._controlledReadableStream;if(this._queue.length>0){const r=ce(this);this._closeRequested&&0===this._queue.length?(Vt(this),hr(t)):Nt(this),e._chunkSteps(r)}else V(t,e),Nt(this)}}function xt(e){return!!n(e)&&(!!Object.prototype.hasOwnProperty.call(e,"_controlledReadableStream")&&e instanceof ReadableStreamDefaultController)}function Nt(e){if(!Ht(e))return;if(e._pulling)return void(e._pullAgain=!0);e._pulling=!0;h(e._pullAlgorithm(),(()=>{e._pulling=!1,e._pullAgain&&(e._pullAgain=!1,Nt(e))}),(t=>{Xt(e,t)}))}function Ht(e){const t=e._controlledReadableStream;if(!Kt(e))return!1;if(!e._started)return!1;if(fr(t)&&G(t)>0)return!0;return Jt(e)>0}function Vt(e){e._pullAlgorithm=void 0,e._cancelAlgorithm=void 0,e._strategySizeAlgorithm=void 0}function Ut(e){if(!Kt(e))return;const t=e._controlledReadableStream;e._closeRequested=!0,0===e._queue.length&&(Vt(e),hr(t))}function Gt(e,t){if(!Kt(e))return;const r=e._controlledReadableStream;if(fr(r)&&G(r)>0)U(r,t,!1);else{let r;try{r=e._strategySizeAlgorithm(t)}catch(t){throw Xt(e,t),t}try{de(e,t,r)}catch(t){throw Xt(e,t),t}}Nt(e)}function Xt(e,t){const r=e._controlledReadableStream;"readable"===r._state&&(fe(e),Vt(e),_r(r,t))}function Jt(e){const t=e._controlledReadableStream._state;return"errored"===t?null:"closed"===t?0:e._strategyHWM-e._queueTotalSize}function Kt(e){const t=e._controlledReadableStream._state;return!e._closeRequested&&"readable"===t}function Zt(e,t,r,o,n,a,i){t._controlledReadableStream=e,t._queue=void 0,t._queueTotalSize=void 0,fe(t),t._started=!1,t._closeRequested=!1,t._pullAgain=!1,t._pulling=!1,t._strategySizeAlgorithm=i,t._strategyHWM=a,t._pullAlgorithm=o,t._cancelAlgorithm=n,e._readableStreamController=t;h(d(r()),(()=>{t._started=!0,Nt(t)}),(e=>{Xt(t,e)}))}function er(e){return new TypeError(`ReadableStreamDefaultController.prototype.${e} can only be used on a ReadableStreamDefaultController`)}function tr(e,t){return be(e._readableStreamController)?function(e){let t,r,o,n,a,i=H(e),l=!1,s=!1,u=!1,f=!1,b=!1;const h=c((e=>{a=e}));function _(e){m(e._closedPromise,(t=>{e===i&&(Oe(o._readableStreamController,t),Oe(n._readableStreamController,t),f&&b||a(void 0))}))}function p(){Qe(i)&&(C(i),i=H(e),_(i));K(i,{_chunkSteps:t=>{g((()=>{s=!1,u=!1;const r=t;let i=t;if(!f&&!b)try{i=ue(t)}catch(t){return Oe(o._readableStreamController,t),Oe(n._readableStreamController,t),void a(br(e,t))}f||We(o._readableStreamController,r),b||We(n._readableStreamController,i),l=!1,s?S():u&&v()}))},_closeSteps:()=>{l=!1,f||Ee(o._readableStreamController),b||Ee(n._readableStreamController),o._readableStreamController._pendingPullIntos.length>0&&je(o._readableStreamController,0),n._readableStreamController._pendingPullIntos.length>0&&je(n._readableStreamController,0),f&&b||a(void 0)},_errorSteps:()=>{l=!1}})}function y(t,r){J(i)&&(C(i),i=Fe(e),_(i));const c=r?n:o,d=r?o:n;Ye(i,t,{_chunkSteps:t=>{g((()=>{s=!1,u=!1;const o=r?b:f;if(r?f:b)o||Ae(c._readableStreamController,t);else{let r;try{r=ue(t)}catch(t){return Oe(c._readableStreamController,t),Oe(d._readableStreamController,t),void a(br(e,t))}o||Ae(c._readableStreamController,t),We(d._readableStreamController,r)}l=!1,s?S():u&&v()}))},_closeSteps:e=>{l=!1;const t=r?b:f,o=r?f:b;t||Ee(c._readableStreamController),o||Ee(d._readableStreamController),void 0!==e&&(t||Ae(c._readableStreamController,e),!o&&d._readableStreamController._pendingPullIntos.length>0&&je(d._readableStreamController,0)),t&&o||a(void 0)},_errorSteps:()=>{l=!1}})}function S(){if(l)return s=!0,d(void 0);l=!0;const e=Be(o._readableStreamController);return null===e?p():y(e._view,!1),d(void 0)}function v(){if(l)return u=!0,d(void 0);l=!0;const e=Be(n._readableStreamController);return null===e?p():y(e._view,!0),d(void 0)}function w(o){if(f=!0,t=o,b){const o=ie([t,r]),n=br(e,o);a(n)}return h}function R(o){if(b=!0,r=o,f){const o=ie([t,r]),n=br(e,o);a(n)}return h}function T(){}return o=ur(T,S,w),n=ur(T,v,R),_(i),[o,n]}(e):function(e,t){const r=H(e);let o,n,a,i,l,s=!1,u=!1,f=!1,b=!1;const h=c((e=>{l=e}));function _(){if(s)return u=!0,d(void 0);s=!0;return K(r,{_chunkSteps:e=>{g((()=>{u=!1;const t=e,r=e;f||Gt(a._readableStreamController,t),b||Gt(i._readableStreamController,r),s=!1,u&&_()}))},_closeSteps:()=>{s=!1,f||Ut(a._readableStreamController),b||Ut(i._readableStreamController),f&&b||l(void 0)},_errorSteps:()=>{s=!1}}),d(void 0)}function p(t){if(f=!0,o=t,b){const t=ie([o,n]),r=br(e,t);l(r)}return h}function y(t){if(b=!0,n=t,f){const t=ie([o,n]),r=br(e,t);l(r)}return h}function S(){}return a=sr(S,_,p),i=sr(S,_,y),m(r._closedPromise,(e=>{Xt(a._readableStreamController,e),Xt(i._readableStreamController,e),f&&b||l(void 0)})),[a,i]}(e)}function rr(e,t,r){return F(e,r),r=>v(e,t,[r])}function or(e,t,r){return F(e,r),r=>v(e,t,[r])}function nr(e,t,r){return F(e,r),r=>S(e,t,[r])}function ar(e,t){if("bytes"!==(e=`${e}`))throw new TypeError(`${t} '${e}' is not a valid enumeration value for ReadableStreamType`);return e}function ir(e,t){if("byob"!==(e=`${e}`))throw new TypeError(`${t} '${e}' is not a valid enumeration value for ReadableStreamReaderMode`);return e}function lr(e,t){L(e,t);const r=null==e?void 0:e.preventAbort,o=null==e?void 0:e.preventCancel,n=null==e?void 0:e.preventClose,a=null==e?void 0:e.signal;return void 0!==a&&function(e,t){if(!function(e){if("object"!=typeof e||null===e)return!1;try{return"boolean"==typeof e.aborted}catch(e){return!1}}(e))throw new TypeError(`${t} is not an AbortSignal.`)}(a,`${t} has member 'signal' that`),{preventAbort:Boolean(r),preventCancel:Boolean(o),preventClose:Boolean(n),signal:a}}Object.defineProperties(ReadableStreamDefaultController.prototype,{close:{enumerable:!0},enqueue:{enumerable:!0},error:{enumerable:!0},desiredSize:{enumerable:!0}}),"symbol"==typeof t.toStringTag&&Object.defineProperty(ReadableStreamDefaultController.prototype,t.toStringTag,{value:"ReadableStreamDefaultController",configurable:!0});class ReadableStream{constructor(e={},t={}){void 0===e?e=null:I(e,"First parameter");const r=Ve(t,"Second parameter"),o=function(e,t){L(e,t);const r=e,o=null==r?void 0:r.autoAllocateChunkSize,n=null==r?void 0:r.cancel,a=null==r?void 0:r.pull,i=null==r?void 0:r.start,l=null==r?void 0:r.type;return{autoAllocateChunkSize:void 0===o?void 0:x(o,`${t} has member 'autoAllocateChunkSize' that`),cancel:void 0===n?void 0:rr(n,r,`${t} has member 'cancel' that`),pull:void 0===a?void 0:or(a,r,`${t} has member 'pull' that`),start:void 0===i?void 0:nr(i,r,`${t} has member 'start' that`),type:void 0===l?void 0:ar(l,`${t} has member 'type' that`)}}(e,"First parameter");if(cr(this),"bytes"===o.type){if(void 0!==r.size)throw new RangeError("The strategy for a byte stream cannot have a size function");!function(e,t,r){const o=Object.create(ReadableByteStreamController.prototype);let n=()=>{},a=()=>d(void 0),i=()=>d(void 0);void 0!==t.start&&(n=()=>t.start(o)),void 0!==t.pull&&(a=()=>t.pull(o)),void 0!==t.cancel&&(i=e=>t.cancel(e));const l=t.autoAllocateChunkSize;if(0===l)throw new TypeError("autoAllocateChunkSize must be greater than 0");ze(e,o,n,a,i,r,l)}(this,o,Ne(r,0))}else{const e=He(r);!function(e,t,r,o){const n=Object.create(ReadableStreamDefaultController.prototype);let a=()=>{},i=()=>d(void 0),l=()=>d(void 0);void 0!==t.start&&(a=()=>t.start(n)),void 0!==t.pull&&(i=()=>t.pull(n)),void 0!==t.cancel&&(l=e=>t.cancel(e)),Zt(e,n,a,i,l,r,o)}(this,o,Ne(r,1),e)}}get locked(){if(!dr(this))throw mr("locked");return fr(this)}cancel(e){return dr(this)?fr(this)?f(new TypeError("Cannot cancel a stream that already has a reader")):br(this,e):f(mr("cancel"))}getReader(e){if(!dr(this))throw mr("getReader");return void 0===function(e,t){L(e,t);const r=null==e?void 0:e.mode;return{mode:void 0===r?void 0:ir(r,`${t} has member 'mode' that`)}}(e,"First parameter").mode?H(this):Fe(this)}pipeThrough(e,t={}){if(!dr(this))throw mr("pipeThrough");$(e,1,"pipeThrough");const r=function(e,t){L(e,t);const r=null==e?void 0:e.readable;M(r,"readable","ReadableWritablePair"),N(r,`${t} has member 'readable' that`);const o=null==e?void 0:e.writable;return M(o,"writable","ReadableWritablePair"),Ze(o,`${t} has member 'writable' that`),{readable:r,writable:o}}(e,"First parameter"),o=lr(t,"Second parameter");if(fr(this))throw new TypeError("ReadableStream.prototype.pipeThrough cannot be used on a locked ReadableStream");if(nt(r.writable))throw new TypeError("ReadableStream.prototype.pipeThrough cannot be used on a locked WritableStream");return y(Yt(this,r.writable,o.preventClose,o.preventAbort,o.preventCancel,o.signal)),r.readable}pipeTo(e,t={}){if(!dr(this))return f(mr("pipeTo"));if(void 0===e)return f("Parameter 1 is required in 'pipeTo'.");if(!ot(e))return f(new TypeError("ReadableStream.prototype.pipeTo's first argument must be a WritableStream"));let r;try{r=lr(t,"Second parameter")}catch(e){return f(e)}return fr(this)?f(new TypeError("ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream")):nt(e)?f(new TypeError("ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream")):Yt(this,e,r.preventClose,r.preventAbort,r.preventCancel,r.signal)}tee(){if(!dr(this))throw mr("tee");return ie(tr(this))}values(e){if(!dr(this))throw mr("values");return function(e,t){const r=H(e),o=new te(r,t),n=Object.create(re);return n._asyncIteratorImpl=o,n}(this,function(e,t){L(e,t);const r=null==e?void 0:e.preventCancel;return{preventCancel:Boolean(r)}}(e,"First parameter").preventCancel)}}function sr(e,t,r,o=1,n=(()=>1)){const a=Object.create(ReadableStream.prototype);cr(a);return Zt(a,Object.create(ReadableStreamDefaultController.prototype),e,t,r,o,n),a}function ur(e,t,r){const o=Object.create(ReadableStream.prototype);cr(o);return ze(o,Object.create(ReadableByteStreamController.prototype),e,t,r,0,void 0),o}function cr(e){e._state="readable",e._reader=void 0,e._storedError=void 0,e._disturbed=!1}function dr(e){return!!n(e)&&(!!Object.prototype.hasOwnProperty.call(e,"_readableStreamController")&&e instanceof ReadableStream)}function fr(e){return void 0!==e._reader}function br(e,t){if(e._disturbed=!0,"closed"===e._state)return d(void 0);if("errored"===e._state)return f(e._storedError);hr(e);const o=e._reader;void 0!==o&&Qe(o)&&(o._readIntoRequests.forEach((e=>{e._closeSteps(void 0)})),o._readIntoRequests=new w);return p(e._readableStreamController[j](t),r)}function hr(e){e._state="closed";const t=e._reader;void 0!==t&&(O(t),J(t)&&(t._readRequests.forEach((e=>{e._closeSteps()})),t._readRequests=new w))}function _r(e,t){e._state="errored",e._storedError=t;const r=e._reader;void 0!==r&&(W(r,t),J(r)?(r._readRequests.forEach((e=>{e._errorSteps(t)})),r._readRequests=new w):(r._readIntoRequests.forEach((e=>{e._errorSteps(t)})),r._readIntoRequests=new w))}function mr(e){return new TypeError(`ReadableStream.prototype.${e} can only be used on a ReadableStream`)}function pr(e,t){L(e,t);const r=null==e?void 0:e.highWaterMark;return M(r,"highWaterMark","QueuingStrategyInit"),{highWaterMark:Q(r)}}Object.defineProperties(ReadableStream.prototype,{cancel:{enumerable:!0},getReader:{enumerable:!0},pipeThrough:{enumerable:!0},pipeTo:{enumerable:!0},tee:{enumerable:!0},values:{enumerable:!0},locked:{enumerable:!0}}),"symbol"==typeof t.toStringTag&&Object.defineProperty(ReadableStream.prototype,t.toStringTag,{value:"ReadableStream",configurable:!0}),"symbol"==typeof t.asyncIterator&&Object.defineProperty(ReadableStream.prototype,t.asyncIterator,{value:ReadableStream.prototype.values,writable:!0,configurable:!0});const yr=e=>e.byteLength;try{Object.defineProperty(yr,"name",{value:"size",configurable:!0})}catch(e){}class ByteLengthQueuingStrategy{constructor(e){$(e,1,"ByteLengthQueuingStrategy"),e=pr(e,"First parameter"),this._byteLengthQueuingStrategyHighWaterMark=e.highWaterMark}get highWaterMark(){if(!Sr(this))throw gr("highWaterMark");return this._byteLengthQueuingStrategyHighWaterMark}get size(){if(!Sr(this))throw gr("size");return yr}}function gr(e){return new TypeError(`ByteLengthQueuingStrategy.prototype.${e} can only be used on a ByteLengthQueuingStrategy`)}function Sr(e){return!!n(e)&&(!!Object.prototype.hasOwnProperty.call(e,"_byteLengthQueuingStrategyHighWaterMark")&&e instanceof ByteLengthQueuingStrategy)}Object.defineProperties(ByteLengthQueuingStrategy.prototype,{highWaterMark:{enumerable:!0},size:{enumerable:!0}}),"symbol"==typeof t.toStringTag&&Object.defineProperty(ByteLengthQueuingStrategy.prototype,t.toStringTag,{value:"ByteLengthQueuingStrategy",configurable:!0});const vr=()=>1;try{Object.defineProperty(vr,"name",{value:"size",configurable:!0})}catch(e){}class CountQueuingStrategy{constructor(e){$(e,1,"CountQueuingStrategy"),e=pr(e,"First parameter"),this._countQueuingStrategyHighWaterMark=e.highWaterMark}get highWaterMark(){if(!Rr(this))throw wr("highWaterMark");return this._countQueuingStrategyHighWaterMark}get size(){if(!Rr(this))throw wr("size");return vr}}function wr(e){return new TypeError(`CountQueuingStrategy.prototype.${e} can only be used on a CountQueuingStrategy`)}function Rr(e){return!!n(e)&&(!!Object.prototype.hasOwnProperty.call(e,"_countQueuingStrategyHighWaterMark")&&e instanceof CountQueuingStrategy)}function Tr(e,t,r){return F(e,r),r=>v(e,t,[r])}function Cr(e,t,r){return F(e,r),r=>S(e,t,[r])}function Pr(e,t,r){return F(e,r),(r,o)=>v(e,t,[r,o])}Object.defineProperties(CountQueuingStrategy.prototype,{highWaterMark:{enumerable:!0},size:{enumerable:!0}}),"symbol"==typeof t.toStringTag&&Object.defineProperty(CountQueuingStrategy.prototype,t.toStringTag,{value:"CountQueuingStrategy",configurable:!0});class TransformStream{constructor(e={},t={},r={}){void 0===e&&(e=null);const o=Ve(t,"Second parameter"),n=Ve(r,"Third parameter"),a=function(e,t){L(e,t);const r=null==e?void 0:e.flush,o=null==e?void 0:e.readableType,n=null==e?void 0:e.start,a=null==e?void 0:e.transform,i=null==e?void 0:e.writableType;return{flush:void 0===r?void 0:Tr(r,e,`${t} has member 'flush' that`),readableType:o,start:void 0===n?void 0:Cr(n,e,`${t} has member 'start' that`),transform:void 0===a?void 0:Pr(a,e,`${t} has member 'transform' that`),writableType:i}}(e,"First parameter");if(void 0!==a.readableType)throw new RangeError("Invalid readableType specified");if(void 0!==a.writableType)throw new RangeError("Invalid writableType specified");const i=Ne(n,0),l=He(n),s=Ne(o,1),u=He(o);let b;!function(e,t,r,o,n,a){function i(){return t}function l(t){return function(e,t){const r=e._transformStreamController;if(e._backpressure){return p(e._backpressureChangePromise,(()=>{const o=e._writable;if("erroring"===o._state)throw o._storedError;return Ar(r,t)}))}return Ar(r,t)}(e,t)}function s(t){return function(e,t){return Er(e,t),d(void 0)}(e,t)}function u(){return function(e){const t=e._readable,r=e._transformStreamController,o=r._flushAlgorithm();return kr(r),p(o,(()=>{if("errored"===t._state)throw t._storedError;Ut(t._readableStreamController)}),(r=>{throw Er(e,r),t._storedError}))}(e)}function c(){return function(e){return Or(e,!1),e._backpressureChangePromise}(e)}function f(t){return Wr(e,t),d(void 0)}e._writable=function(e,t,r,o,n=1,a=(()=>1)){const i=Object.create(WritableStream.prototype);return rt(i),vt(i,Object.create(WritableStreamDefaultController.prototype),e,t,r,o,n,a),i}(i,l,u,s,r,o),e._readable=sr(i,c,f,n,a),e._backpressure=void 0,e._backpressureChangePromise=void 0,e._backpressureChangePromise_resolve=void 0,Or(e,!0),e._transformStreamController=void 0}(this,c((e=>{b=e})),s,u,i,l),function(e,t){const r=Object.create(TransformStreamDefaultController.prototype);let o=e=>{try{return jr(r,e),d(void 0)}catch(e){return f(e)}},n=()=>d(void 0);void 0!==t.transform&&(o=e=>t.transform(e,r));void 0!==t.flush&&(n=()=>t.flush(r));!function(e,t,r,o){t._controlledTransformStream=e,e._transformStreamController=t,t._transformAlgorithm=r,t._flushAlgorithm=o}(e,r,o,n)}(this,a),void 0!==a.start?b(a.start(this._transformStreamController)):b(void 0)}get readable(){if(!qr(this))throw Dr("readable");return this._readable}get writable(){if(!qr(this))throw Dr("writable");return this._writable}}function qr(e){return!!n(e)&&(!!Object.prototype.hasOwnProperty.call(e,"_transformStreamController")&&e instanceof TransformStream)}function Er(e,t){Xt(e._readable._readableStreamController,t),Wr(e,t)}function Wr(e,t){kr(e._transformStreamController),Ct(e._writable._writableStreamController,t),e._backpressure&&Or(e,!1)}function Or(e,t){void 0!==e._backpressureChangePromise&&e._backpressureChangePromise_resolve(),e._backpressureChangePromise=c((t=>{e._backpressureChangePromise_resolve=t})),e._backpressure=t}Object.defineProperties(TransformStream.prototype,{readable:{enumerable:!0},writable:{enumerable:!0}}),"symbol"==typeof t.toStringTag&&Object.defineProperty(TransformStream.prototype,t.toStringTag,{value:"TransformStream",configurable:!0});class TransformStreamDefaultController{constructor(){throw new TypeError("Illegal constructor")}get desiredSize(){if(!Br(this))throw zr("desiredSize");return Jt(this._controlledTransformStream._readable._readableStreamController)}enqueue(e){if(!Br(this))throw zr("enqueue");jr(this,e)}error(e){if(!Br(this))throw zr("error");var t;t=e,Er(this._controlledTransformStream,t)}terminate(){if(!Br(this))throw zr("terminate");!function(e){const t=e._controlledTransformStream;Ut(t._readable._readableStreamController);const r=new TypeError("TransformStream terminated");Wr(t,r)}(this)}}function Br(e){return!!n(e)&&(!!Object.prototype.hasOwnProperty.call(e,"_controlledTransformStream")&&e instanceof TransformStreamDefaultController)}function kr(e){e._transformAlgorithm=void 0,e._flushAlgorithm=void 0}function jr(e,t){const r=e._controlledTransformStream,o=r._readable._readableStreamController;if(!Kt(o))throw new TypeError("Readable side is not in a state that permits enqueue");try{Gt(o,t)}catch(e){throw Wr(r,e),r._readable._storedError}(function(e){return!Ht(e)})(o)!==r._backpressure&&Or(r,!0)}function Ar(e,t){return p(e._transformAlgorithm(t),void 0,(t=>{throw Er(e._controlledTransformStream,t),t}))}function zr(e){return new TypeError(`TransformStreamDefaultController.prototype.${e} can only be used on a TransformStreamDefaultController`)}function Dr(e){return new TypeError(`TransformStream.prototype.${e} can only be used on a TransformStream`)}Object.defineProperties(TransformStreamDefaultController.prototype,{enqueue:{enumerable:!0},error:{enumerable:!0},terminate:{enumerable:!0},desiredSize:{enumerable:!0}}),"symbol"==typeof t.toStringTag&&Object.defineProperty(TransformStreamDefaultController.prototype,t.toStringTag,{value:"TransformStreamDefaultController",configurable:!0});const Lr={ReadableStream:ReadableStream,ReadableStreamDefaultController:ReadableStreamDefaultController,ReadableByteStreamController:ReadableByteStreamController,ReadableStreamBYOBRequest:ReadableStreamBYOBRequest,ReadableStreamDefaultReader:ReadableStreamDefaultReader,ReadableStreamBYOBReader:ReadableStreamBYOBReader,WritableStream:WritableStream,WritableStreamDefaultController:WritableStreamDefaultController,WritableStreamDefaultWriter:WritableStreamDefaultWriter,ByteLengthQueuingStrategy:ByteLengthQueuingStrategy,CountQueuingStrategy:CountQueuingStrategy,TransformStream:TransformStream,TransformStreamDefaultController:TransformStreamDefaultController};if(void 0!==o)for(const e in Lr)Object.prototype.hasOwnProperty.call(Lr,e)&&Object.defineProperty(o,e,{value:Lr[e],writable:!0,configurable:!0});e.ByteLengthQueuingStrategy=ByteLengthQueuingStrategy,e.CountQueuingStrategy=CountQueuingStrategy,e.ReadableByteStreamController=ReadableByteStreamController,e.ReadableStream=ReadableStream,e.ReadableStreamBYOBReader=ReadableStreamBYOBReader,e.ReadableStreamBYOBRequest=ReadableStreamBYOBRequest,e.ReadableStreamDefaultController=ReadableStreamDefaultController,e.ReadableStreamDefaultReader=ReadableStreamDefaultReader,e.TransformStream=TransformStream,e.TransformStreamDefaultController=TransformStreamDefaultController,e.WritableStream=WritableStream,e.WritableStreamDefaultController=WritableStreamDefaultController,e.WritableStreamDefaultWriter=WritableStreamDefaultWriter,Object.defineProperty(e,"__esModule",{value:!0})}));
+//# sourceMappingURL=polyfill.es2018.min.js.map
diff --git a/node_modules/web-streams-polyfill/dist/polyfill.es2018.min.js.map b/node_modules/web-streams-polyfill/dist/polyfill.es2018.min.js.map
new file mode 100644
index 0000000..b27333d
--- /dev/null
+++ b/node_modules/web-streams-polyfill/dist/polyfill.es2018.min.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"polyfill.es2018.min.js","sources":["../src/stub/symbol.ts","../src/utils.ts","../src/lib/helpers/miscellaneous.ts","../src/lib/helpers/webidl.ts","../src/lib/simple-queue.ts","../src/lib/readable-stream/generic-reader.ts","../src/lib/abstract-ops/internal-methods.ts","../src/stub/number-isfinite.ts","../src/stub/math-trunc.ts","../src/lib/validators/basic.ts","../src/lib/validators/readable-stream.ts","../src/lib/readable-stream/default-reader.ts","../src/target/es2018/stub/async-iterator-prototype.ts","../src/lib/readable-stream/async-iterator.ts","../src/stub/number-isnan.ts","../src/lib/abstract-ops/ecmascript.ts","../src/lib/abstract-ops/miscellaneous.ts","../src/lib/abstract-ops/queue-with-sizes.ts","../src/lib/readable-stream/byte-stream-controller.ts","../src/lib/readable-stream/byob-reader.ts","../src/lib/abstract-ops/queuing-strategy.ts","../src/lib/validators/queuing-strategy.ts","../src/lib/validators/underlying-sink.ts","../src/lib/validators/writable-stream.ts","../src/lib/abort-signal.ts","../src/lib/writable-stream.ts","../src/stub/native.ts","../src/stub/dom-exception.ts","../src/lib/readable-stream/pipe.ts","../src/lib/readable-stream/default-controller.ts","../src/lib/readable-stream/tee.ts","../src/lib/validators/underlying-source.ts","../src/lib/validators/reader-options.ts","../src/lib/validators/pipe-options.ts","../src/lib/readable-stream.ts","../src/lib/validators/readable-writable-pair.ts","../src/lib/validators/iterator-options.ts","../src/lib/validators/queuing-strategy-init.ts","../src/lib/byte-length-queuing-strategy.ts","../src/lib/count-queuing-strategy.ts","../src/lib/validators/transformer.ts","../src/lib/transform-stream.ts","../src/polyfill.ts"],"sourcesContent":["/// <reference lib=\"es2015.symbol\" />\n\nconst SymbolPolyfill: (description?: string) => symbol =\n  typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol' ?\n    Symbol :\n    description => `Symbol(${description})` as any as symbol;\n\nexport default SymbolPolyfill;\n","/// <reference lib=\"dom\" />\n\nexport function noop(): undefined {\n  return undefined;\n}\n\nfunction getGlobals() {\n  if (typeof self !== 'undefined') {\n    return self;\n  } else if (typeof window !== 'undefined') {\n    return window;\n  } else if (typeof global !== 'undefined') {\n    return global;\n  }\n  return undefined;\n}\n\nexport const globals = getGlobals();\n","import { noop } from '../../utils';\nimport { AssertionError } from '../../stub/assert';\n\nexport function typeIsObject(x: any): x is object {\n  return (typeof x === 'object' && x !== null) || typeof x === 'function';\n}\n\nexport const rethrowAssertionErrorRejection: (e: any) => void =\n  DEBUG ? e => {\n    // Used throughout the reference implementation, as `.catch(rethrowAssertionErrorRejection)`, to ensure any errors\n    // get shown. There are places in the spec where we do promise transformations and purposefully ignore or don't\n    // expect any errors, but assertion errors are always problematic.\n    if (e && e instanceof AssertionError) {\n      setTimeout(() => {\n        throw e;\n      }, 0);\n    }\n  } : noop;\n","import { globals } from '../../utils';\nimport { rethrowAssertionErrorRejection } from './miscellaneous';\nimport assert from '../../stub/assert';\n\nconst originalPromise = Promise;\nconst originalPromiseThen = Promise.prototype.then;\nconst originalPromiseResolve = Promise.resolve.bind(originalPromise);\nconst originalPromiseReject = Promise.reject.bind(originalPromise);\n\nexport function newPromise<T>(executor: (\n  resolve: (value: T | PromiseLike<T>) => void,\n  reject: (reason?: any) => void\n) => void): Promise<T> {\n  return new originalPromise(executor);\n}\n\nexport function promiseResolvedWith<T>(value: T | PromiseLike<T>): Promise<T> {\n  return originalPromiseResolve(value);\n}\n\nexport function promiseRejectedWith<T = never>(reason: any): Promise<T> {\n  return originalPromiseReject(reason);\n}\n\nexport function PerformPromiseThen<T, TResult1 = T, TResult2 = never>(\n  promise: Promise<T>,\n  onFulfilled?: (value: T) => TResult1 | PromiseLike<TResult1>,\n  onRejected?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2> {\n  // There doesn't appear to be any way to correctly emulate the behaviour from JavaScript, so this is just an\n  // approximation.\n  return originalPromiseThen.call(promise, onFulfilled, onRejected) as Promise<TResult1 | TResult2>;\n}\n\nexport function uponPromise<T>(\n  promise: Promise<T>,\n  onFulfilled?: (value: T) => void | PromiseLike<void>,\n  onRejected?: (reason: any) => void | PromiseLike<void>): void {\n  PerformPromiseThen(\n    PerformPromiseThen(promise, onFulfilled, onRejected),\n    undefined,\n    rethrowAssertionErrorRejection\n  );\n}\n\nexport function uponFulfillment<T>(promise: Promise<T>, onFulfilled: (value: T) => void | PromiseLike<void>): void {\n  uponPromise(promise, onFulfilled);\n}\n\nexport function uponRejection(promise: Promise<unknown>, onRejected: (reason: any) => void | PromiseLike<void>): void {\n  uponPromise(promise, undefined, onRejected);\n}\n\nexport function transformPromiseWith<T, TResult1 = T, TResult2 = never>(\n  promise: Promise<T>,\n  fulfillmentHandler?: (value: T) => TResult1 | PromiseLike<TResult1>,\n  rejectionHandler?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2> {\n  return PerformPromiseThen(promise, fulfillmentHandler, rejectionHandler);\n}\n\nexport function setPromiseIsHandledToTrue(promise: Promise<unknown>): void {\n  PerformPromiseThen(promise, undefined, rethrowAssertionErrorRejection);\n}\n\nexport const queueMicrotask: (fn: () => void) => void = (() => {\n  const globalQueueMicrotask = globals && globals.queueMicrotask;\n  if (typeof globalQueueMicrotask === 'function') {\n    return globalQueueMicrotask;\n  }\n\n  const resolvedPromise = promiseResolvedWith(undefined);\n  return (fn: () => void) => PerformPromiseThen(resolvedPromise, fn);\n})();\n\nexport function reflectCall<T, A extends any[], R>(F: (this: T, ...fnArgs: A) => R, V: T, args: A): R {\n  if (typeof F !== 'function') {\n    throw new TypeError('Argument is not a function');\n  }\n  return Function.prototype.apply.call(F, V, args);\n}\n\nexport function promiseCall<T, A extends any[], R>(F: (this: T, ...fnArgs: A) => R | PromiseLike<R>,\n                                                   V: T,\n                                                   args: A): Promise<R> {\n  assert(typeof F === 'function');\n  assert(V !== undefined);\n  assert(Array.isArray(args));\n  try {\n    return promiseResolvedWith(reflectCall(F, V, args));\n  } catch (value) {\n    return promiseRejectedWith(value);\n  }\n}\n","import assert from '../stub/assert';\n\n// Original from Chromium\n// https://chromium.googlesource.com/chromium/src/+/0aee4434a4dba42a42abaea9bfbc0cd196a63bc1/third_party/blink/renderer/core/streams/SimpleQueue.js\n\nconst QUEUE_MAX_ARRAY_SIZE = 16384;\n\ninterface Node<T> {\n  _elements: T[];\n  _next: Node<T> | undefined;\n}\n\n/**\n * Simple queue structure.\n *\n * Avoids scalability issues with using a packed array directly by using\n * multiple arrays in a linked list and keeping the array size bounded.\n */\nexport class SimpleQueue<T> {\n  private _front: Node<T>;\n  private _back: Node<T>;\n  private _cursor = 0;\n  private _size = 0;\n\n  constructor() {\n    // _front and _back are always defined.\n    this._front = {\n      _elements: [],\n      _next: undefined\n    };\n    this._back = this._front;\n    // The cursor is used to avoid calling Array.shift().\n    // It contains the index of the front element of the array inside the\n    // front-most node. It is always in the range [0, QUEUE_MAX_ARRAY_SIZE).\n    this._cursor = 0;\n    // When there is only one node, size === elements.length - cursor.\n    this._size = 0;\n  }\n\n  get length(): number {\n    return this._size;\n  }\n\n  // For exception safety, this method is structured in order:\n  // 1. Read state\n  // 2. Calculate required state mutations\n  // 3. Perform state mutations\n  push(element: T): void {\n    const oldBack = this._back;\n    let newBack = oldBack;\n    assert(oldBack._next === undefined);\n    if (oldBack._elements.length === QUEUE_MAX_ARRAY_SIZE - 1) {\n      newBack = {\n        _elements: [],\n        _next: undefined\n      };\n    }\n\n    // push() is the mutation most likely to throw an exception, so it\n    // goes first.\n    oldBack._elements.push(element);\n    if (newBack !== oldBack) {\n      this._back = newBack;\n      oldBack._next = newBack;\n    }\n    ++this._size;\n  }\n\n  // Like push(), shift() follows the read -> calculate -> mutate pattern for\n  // exception safety.\n  shift(): T {\n    assert(this._size > 0); // must not be called on an empty queue\n\n    const oldFront = this._front;\n    let newFront = oldFront;\n    const oldCursor = this._cursor;\n    let newCursor = oldCursor + 1;\n\n    const elements = oldFront._elements;\n    const element = elements[oldCursor];\n\n    if (newCursor === QUEUE_MAX_ARRAY_SIZE) {\n      assert(elements.length === QUEUE_MAX_ARRAY_SIZE);\n      assert(oldFront._next !== undefined);\n      newFront = oldFront._next!;\n      newCursor = 0;\n    }\n\n    // No mutations before this point.\n    --this._size;\n    this._cursor = newCursor;\n    if (oldFront !== newFront) {\n      this._front = newFront;\n    }\n\n    // Permit shifted element to be garbage collected.\n    elements[oldCursor] = undefined!;\n\n    return element;\n  }\n\n  // The tricky thing about forEach() is that it can be called\n  // re-entrantly. The queue may be mutated inside the callback. It is easy to\n  // see that push() within the callback has no negative effects since the end\n  // of the queue is checked for on every iteration. If shift() is called\n  // repeatedly within the callback then the next iteration may return an\n  // element that has been removed. In this case the callback will be called\n  // with undefined values until we either \"catch up\" with elements that still\n  // exist or reach the back of the queue.\n  forEach(callback: (element: T) => void): void {\n    let i = this._cursor;\n    let node = this._front;\n    let elements = node._elements;\n    while (i !== elements.length || node._next !== undefined) {\n      if (i === elements.length) {\n        assert(node._next !== undefined);\n        assert(i === QUEUE_MAX_ARRAY_SIZE);\n        node = node._next!;\n        elements = node._elements;\n        i = 0;\n        if (elements.length === 0) {\n          break;\n        }\n      }\n      callback(elements[i]);\n      ++i;\n    }\n  }\n\n  // Return the element that would be returned if shift() was called now,\n  // without modifying the queue.\n  peek(): T {\n    assert(this._size > 0); // must not be called on an empty queue\n\n    const front = this._front;\n    const cursor = this._cursor;\n    return front._elements[cursor];\n  }\n}\n","import assert from '../../stub/assert';\nimport { ReadableStream, ReadableStreamCancel, ReadableStreamReader } from '../readable-stream';\nimport { newPromise, setPromiseIsHandledToTrue } from '../helpers/webidl';\n\nexport function ReadableStreamReaderGenericInitialize<R>(reader: ReadableStreamReader<R>, stream: ReadableStream<R>) {\n  reader._ownerReadableStream = stream;\n  stream._reader = reader;\n\n  if (stream._state === 'readable') {\n    defaultReaderClosedPromiseInitialize(reader);\n  } else if (stream._state === 'closed') {\n    defaultReaderClosedPromiseInitializeAsResolved(reader);\n  } else {\n    assert(stream._state === 'errored');\n\n    defaultReaderClosedPromiseInitializeAsRejected(reader, stream._storedError);\n  }\n}\n\n// A client of ReadableStreamDefaultReader and ReadableStreamBYOBReader may use these functions directly to bypass state\n// check.\n\nexport function ReadableStreamReaderGenericCancel(reader: ReadableStreamReader<any>, reason: any): Promise<undefined> {\n  const stream = reader._ownerReadableStream;\n  assert(stream !== undefined);\n  return ReadableStreamCancel(stream, reason);\n}\n\nexport function ReadableStreamReaderGenericRelease(reader: ReadableStreamReader<any>) {\n  assert(reader._ownerReadableStream !== undefined);\n  assert(reader._ownerReadableStream._reader === reader);\n\n  if (reader._ownerReadableStream._state === 'readable') {\n    defaultReaderClosedPromiseReject(\n      reader,\n      new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));\n  } else {\n    defaultReaderClosedPromiseResetToRejected(\n      reader,\n      new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));\n  }\n\n  reader._ownerReadableStream._reader = undefined;\n  reader._ownerReadableStream = undefined!;\n}\n\n// Helper functions for the readers.\n\nexport function readerLockException(name: string): TypeError {\n  return new TypeError('Cannot ' + name + ' a stream using a released reader');\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nexport function defaultReaderClosedPromiseInitialize(reader: ReadableStreamReader<any>) {\n  reader._closedPromise = newPromise((resolve, reject) => {\n    reader._closedPromise_resolve = resolve;\n    reader._closedPromise_reject = reject;\n  });\n}\n\nexport function defaultReaderClosedPromiseInitializeAsRejected(reader: ReadableStreamReader<any>, reason: any) {\n  defaultReaderClosedPromiseInitialize(reader);\n  defaultReaderClosedPromiseReject(reader, reason);\n}\n\nexport function defaultReaderClosedPromiseInitializeAsResolved(reader: ReadableStreamReader<any>) {\n  defaultReaderClosedPromiseInitialize(reader);\n  defaultReaderClosedPromiseResolve(reader);\n}\n\nexport function defaultReaderClosedPromiseReject(reader: ReadableStreamReader<any>, reason: any) {\n  if (reader._closedPromise_reject === undefined) {\n    return;\n  }\n\n  setPromiseIsHandledToTrue(reader._closedPromise);\n  reader._closedPromise_reject(reason);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n\nexport function defaultReaderClosedPromiseResetToRejected(reader: ReadableStreamReader<any>, reason: any) {\n  assert(reader._closedPromise_resolve === undefined);\n  assert(reader._closedPromise_reject === undefined);\n\n  defaultReaderClosedPromiseInitializeAsRejected(reader, reason);\n}\n\nexport function defaultReaderClosedPromiseResolve(reader: ReadableStreamReader<any>) {\n  if (reader._closedPromise_resolve === undefined) {\n    return;\n  }\n\n  reader._closedPromise_resolve(undefined);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n","export const AbortSteps = Symbol('[[AbortSteps]]');\nexport const ErrorSteps = Symbol('[[ErrorSteps]]');\nexport const CancelSteps = Symbol('[[CancelSteps]]');\nexport const PullSteps = Symbol('[[PullSteps]]');\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite#Polyfill\nconst NumberIsFinite: typeof Number.isFinite = Number.isFinite || function (x) {\n  return typeof x === 'number' && isFinite(x);\n};\n\nexport default NumberIsFinite;\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc#Polyfill\nconst MathTrunc: typeof Math.trunc = Math.trunc || function (v) {\n  return v < 0 ? Math.ceil(v) : Math.floor(v);\n};\n\nexport default MathTrunc;\n","import NumberIsFinite from '../../stub/number-isfinite';\nimport MathTrunc from '../../stub/math-trunc';\n\n// https://heycam.github.io/webidl/#idl-dictionaries\nexport function isDictionary(x: any): x is object | null {\n  return typeof x === 'object' || typeof x === 'function';\n}\n\nexport function assertDictionary(obj: unknown,\n                                 context: string): asserts obj is object | null | undefined {\n  if (obj !== undefined && !isDictionary(obj)) {\n    throw new TypeError(`${context} is not an object.`);\n  }\n}\n\nexport type AnyFunction = (...args: any[]) => any;\n\n// https://heycam.github.io/webidl/#idl-callback-functions\nexport function assertFunction(x: unknown, context: string): asserts x is AnyFunction {\n  if (typeof x !== 'function') {\n    throw new TypeError(`${context} is not a function.`);\n  }\n}\n\n// https://heycam.github.io/webidl/#idl-object\nexport function isObject(x: any): x is object {\n  return (typeof x === 'object' && x !== null) || typeof x === 'function';\n}\n\nexport function assertObject(x: unknown,\n                             context: string): asserts x is object {\n  if (!isObject(x)) {\n    throw new TypeError(`${context} is not an object.`);\n  }\n}\n\nexport function assertRequiredArgument<T extends any>(x: T | undefined,\n                                                      position: number,\n                                                      context: string): asserts x is T {\n  if (x === undefined) {\n    throw new TypeError(`Parameter ${position} is required in '${context}'.`);\n  }\n}\n\nexport function assertRequiredField<T extends any>(x: T | undefined,\n                                                   field: string,\n                                                   context: string): asserts x is T {\n  if (x === undefined) {\n    throw new TypeError(`${field} is required in '${context}'.`);\n  }\n}\n\n// https://heycam.github.io/webidl/#idl-unrestricted-double\nexport function convertUnrestrictedDouble(value: unknown): number {\n  return Number(value);\n}\n\nfunction censorNegativeZero(x: number): number {\n  return x === 0 ? 0 : x;\n}\n\nfunction integerPart(x: number): number {\n  return censorNegativeZero(MathTrunc(x));\n}\n\n// https://heycam.github.io/webidl/#idl-unsigned-long-long\nexport function convertUnsignedLongLongWithEnforceRange(value: unknown, context: string): number {\n  const lowerBound = 0;\n  const upperBound = Number.MAX_SAFE_INTEGER;\n\n  let x = Number(value);\n  x = censorNegativeZero(x);\n\n  if (!NumberIsFinite(x)) {\n    throw new TypeError(`${context} is not a finite number`);\n  }\n\n  x = integerPart(x);\n\n  if (x < lowerBound || x > upperBound) {\n    throw new TypeError(`${context} is outside the accepted range of ${lowerBound} to ${upperBound}, inclusive`);\n  }\n\n  if (!NumberIsFinite(x) || x === 0) {\n    return 0;\n  }\n\n  // TODO Use BigInt if supported?\n  // let xBigInt = BigInt(integerPart(x));\n  // xBigInt = BigInt.asUintN(64, xBigInt);\n  // return Number(xBigInt);\n\n  return x;\n}\n","import { IsReadableStream, ReadableStream } from '../readable-stream';\n\nexport function assertReadableStream(x: unknown, context: string): asserts x is ReadableStream {\n  if (!IsReadableStream(x)) {\n    throw new TypeError(`${context} is not a ReadableStream.`);\n  }\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericInitialize,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport { IsReadableStreamLocked, ReadableStream } from '../readable-stream';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { PullSteps } from '../abstract-ops/internal-methods';\nimport { newPromise, promiseRejectedWith } from '../helpers/webidl';\nimport { assertRequiredArgument } from '../validators/basic';\nimport { assertReadableStream } from '../validators/readable-stream';\n\n/**\n * A result returned by {@link ReadableStreamDefaultReader.read}.\n *\n * @public\n */\nexport type ReadableStreamDefaultReadResult<T> = {\n  done: false;\n  value: T;\n} | {\n  done: true;\n  value?: undefined;\n}\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamDefaultReader<R>(stream: ReadableStream): ReadableStreamDefaultReader<R> {\n  return new ReadableStreamDefaultReader(stream);\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamAddReadRequest<R>(stream: ReadableStream<R>,\n                                                readRequest: ReadRequest<R>): void {\n  assert(IsReadableStreamDefaultReader(stream._reader));\n  assert(stream._state === 'readable');\n\n  (stream._reader! as ReadableStreamDefaultReader<R>)._readRequests.push(readRequest);\n}\n\nexport function ReadableStreamFulfillReadRequest<R>(stream: ReadableStream<R>, chunk: R | undefined, done: boolean) {\n  const reader = stream._reader as ReadableStreamDefaultReader<R>;\n\n  assert(reader._readRequests.length > 0);\n\n  const readRequest = reader._readRequests.shift()!;\n  if (done) {\n    readRequest._closeSteps();\n  } else {\n    readRequest._chunkSteps(chunk!);\n  }\n}\n\nexport function ReadableStreamGetNumReadRequests<R>(stream: ReadableStream<R>): number {\n  return (stream._reader as ReadableStreamDefaultReader<R>)._readRequests.length;\n}\n\nexport function ReadableStreamHasDefaultReader(stream: ReadableStream): boolean {\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return false;\n  }\n\n  if (!IsReadableStreamDefaultReader(reader)) {\n    return false;\n  }\n\n  return true;\n}\n\n// Readers\n\nexport interface ReadRequest<R> {\n  _chunkSteps(chunk: R): void;\n\n  _closeSteps(): void;\n\n  _errorSteps(e: any): void;\n}\n\n/**\n * A default reader vended by a {@link ReadableStream}.\n *\n * @public\n */\nexport class ReadableStreamDefaultReader<R = any> {\n  /** @internal */\n  _ownerReadableStream!: ReadableStream<R>;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readRequests: SimpleQueue<ReadRequest<R>>;\n\n  constructor(stream: ReadableStream<R>) {\n    assertRequiredArgument(stream, 1, 'ReadableStreamDefaultReader');\n    assertReadableStream(stream, 'First parameter');\n\n    if (IsReadableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n    }\n\n    ReadableStreamReaderGenericInitialize(this, stream);\n\n    this._readRequests = new SimpleQueue();\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed,\n   * or rejected if the stream ever errors or the reader's lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('cancel'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('cancel'));\n    }\n\n    return ReadableStreamReaderGenericCancel(this, reason);\n  }\n\n  /**\n   * Returns a promise that allows access to the next chunk from the stream's internal queue, if available.\n   *\n   * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.\n   */\n  read(): Promise<ReadableStreamDefaultReadResult<R>> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('read'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('read from'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamDefaultReadResult<R>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamDefaultReadResult<R>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),\n      _closeSteps: () => resolvePromise({ value: undefined, done: true }),\n      _errorSteps: e => rejectPromise(e)\n    };\n    ReadableStreamDefaultReaderRead(this, readRequest);\n    return promise;\n  }\n\n  /**\n   * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.\n   * If the associated stream is errored when the lock is released, the reader will appear errored in the same way\n   * from now on; otherwise, the reader will appear closed.\n   *\n   * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by\n   * the reader's {@link ReadableStreamDefaultReader.read | read()} method has not yet been settled. Attempting to\n   * do so will throw a `TypeError` and leave the reader locked to the stream.\n   */\n  releaseLock(): void {\n    if (!IsReadableStreamDefaultReader(this)) {\n      throw defaultReaderBrandCheckException('releaseLock');\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return;\n    }\n\n    if (this._readRequests.length > 0) {\n      throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n    }\n\n    ReadableStreamReaderGenericRelease(this);\n  }\n}\n\nObject.defineProperties(ReadableStreamDefaultReader.prototype, {\n  cancel: { enumerable: true },\n  read: { enumerable: true },\n  releaseLock: { enumerable: true },\n  closed: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamDefaultReader.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamDefaultReader',\n    configurable: true\n  });\n}\n\n// Abstract operations for the readers.\n\nexport function IsReadableStreamDefaultReader<R = any>(x: any): x is ReadableStreamDefaultReader<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readRequests')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamDefaultReader;\n}\n\nexport function ReadableStreamDefaultReaderRead<R>(reader: ReadableStreamDefaultReader<R>,\n                                                   readRequest: ReadRequest<R>): void {\n  const stream = reader._ownerReadableStream;\n\n  assert(stream !== undefined);\n\n  stream._disturbed = true;\n\n  if (stream._state === 'closed') {\n    readRequest._closeSteps();\n  } else if (stream._state === 'errored') {\n    readRequest._errorSteps(stream._storedError);\n  } else {\n    assert(stream._state === 'readable');\n    stream._readableStreamController[PullSteps](readRequest as ReadRequest<any>);\n  }\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nfunction defaultReaderBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamDefaultReader.prototype.${name} can only be used on a ReadableStreamDefaultReader`);\n}\n","/// <reference lib=\"es2018.asynciterable\" />\n\n/* eslint-disable @typescript-eslint/no-empty-function */\nexport const AsyncIteratorPrototype: AsyncIterable<any> | undefined =\n  Object.getPrototypeOf(Object.getPrototypeOf(async function* (): AsyncIterableIterator<any> {}).prototype);\n","/// <reference lib=\"es2018.asynciterable\" />\n\nimport { ReadableStream } from '../readable-stream';\nimport {\n  AcquireReadableStreamDefaultReader,\n  ReadableStreamDefaultReader,\n  ReadableStreamDefaultReaderRead,\n  ReadableStreamDefaultReadResult,\n  ReadRequest\n} from './default-reader';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport assert from '../../stub/assert';\nimport { AsyncIteratorPrototype } from '@@target/stub/async-iterator-prototype';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport {\n  newPromise,\n  promiseRejectedWith,\n  promiseResolvedWith,\n  queueMicrotask,\n  transformPromiseWith\n} from '../helpers/webidl';\n\n/**\n * An async iterator returned by {@link ReadableStream.values}.\n *\n * @public\n */\nexport interface ReadableStreamAsyncIterator<R> extends AsyncIterator<R> {\n  next(): Promise<IteratorResult<R, undefined>>;\n\n  return(value?: any): Promise<IteratorResult<any>>;\n}\n\nexport class ReadableStreamAsyncIteratorImpl<R> {\n  private readonly _reader: ReadableStreamDefaultReader<R>;\n  private readonly _preventCancel: boolean;\n  private _ongoingPromise: Promise<ReadableStreamDefaultReadResult<R>> | undefined = undefined;\n  private _isFinished = false;\n\n  constructor(reader: ReadableStreamDefaultReader<R>, preventCancel: boolean) {\n    this._reader = reader;\n    this._preventCancel = preventCancel;\n  }\n\n  next(): Promise<ReadableStreamDefaultReadResult<R>> {\n    const nextSteps = () => this._nextSteps();\n    this._ongoingPromise = this._ongoingPromise ?\n      transformPromiseWith(this._ongoingPromise, nextSteps, nextSteps) :\n      nextSteps();\n    return this._ongoingPromise;\n  }\n\n  return(value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    const returnSteps = () => this._returnSteps(value);\n    return this._ongoingPromise ?\n      transformPromiseWith(this._ongoingPromise, returnSteps, returnSteps) :\n      returnSteps();\n  }\n\n  private _nextSteps(): Promise<ReadableStreamDefaultReadResult<R>> {\n    if (this._isFinished) {\n      return Promise.resolve({ value: undefined, done: true });\n    }\n\n    const reader = this._reader;\n    if (reader._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('iterate'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamDefaultReadResult<R>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamDefaultReadResult<R>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => {\n        this._ongoingPromise = undefined;\n        // This needs to be delayed by one microtask, otherwise we stop pulling too early which breaks a test.\n        // FIXME Is this a bug in the specification, or in the test?\n        queueMicrotask(() => resolvePromise({ value: chunk, done: false }));\n      },\n      _closeSteps: () => {\n        this._ongoingPromise = undefined;\n        this._isFinished = true;\n        ReadableStreamReaderGenericRelease(reader);\n        resolvePromise({ value: undefined, done: true });\n      },\n      _errorSteps: reason => {\n        this._ongoingPromise = undefined;\n        this._isFinished = true;\n        ReadableStreamReaderGenericRelease(reader);\n        rejectPromise(reason);\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n    return promise;\n  }\n\n  private _returnSteps(value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (this._isFinished) {\n      return Promise.resolve({ value, done: true });\n    }\n    this._isFinished = true;\n\n    const reader = this._reader;\n    if (reader._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('finish iterating'));\n    }\n\n    assert(reader._readRequests.length === 0);\n\n    if (!this._preventCancel) {\n      const result = ReadableStreamReaderGenericCancel(reader, value);\n      ReadableStreamReaderGenericRelease(reader);\n      return transformPromiseWith(result, () => ({ value, done: true }));\n    }\n\n    ReadableStreamReaderGenericRelease(reader);\n    return promiseResolvedWith({ value, done: true });\n  }\n}\n\ndeclare class ReadableStreamAsyncIteratorInstance<R> implements ReadableStreamAsyncIterator<R> {\n  /** @interal */\n  _asyncIteratorImpl: ReadableStreamAsyncIteratorImpl<R>;\n\n  next(): Promise<IteratorResult<R, undefined>>;\n\n  return(value?: any): Promise<IteratorResult<any>>;\n}\n\nconst ReadableStreamAsyncIteratorPrototype: ReadableStreamAsyncIteratorInstance<any> = {\n  next(this: ReadableStreamAsyncIteratorInstance<any>): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (!IsReadableStreamAsyncIterator(this)) {\n      return promiseRejectedWith(streamAsyncIteratorBrandCheckException('next'));\n    }\n    return this._asyncIteratorImpl.next();\n  },\n\n  return(this: ReadableStreamAsyncIteratorInstance<any>, value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (!IsReadableStreamAsyncIterator(this)) {\n      return promiseRejectedWith(streamAsyncIteratorBrandCheckException('return'));\n    }\n    return this._asyncIteratorImpl.return(value);\n  }\n} as any;\nif (AsyncIteratorPrototype !== undefined) {\n  Object.setPrototypeOf(ReadableStreamAsyncIteratorPrototype, AsyncIteratorPrototype);\n}\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamAsyncIterator<R>(stream: ReadableStream<R>,\n                                                      preventCancel: boolean): ReadableStreamAsyncIterator<R> {\n  const reader = AcquireReadableStreamDefaultReader<R>(stream);\n  const impl = new ReadableStreamAsyncIteratorImpl(reader, preventCancel);\n  const iterator: ReadableStreamAsyncIteratorInstance<R> = Object.create(ReadableStreamAsyncIteratorPrototype);\n  iterator._asyncIteratorImpl = impl;\n  return iterator;\n}\n\nfunction IsReadableStreamAsyncIterator<R = any>(x: any): x is ReadableStreamAsyncIterator<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_asyncIteratorImpl')) {\n    return false;\n  }\n\n  try {\n    // noinspection SuspiciousTypeOfGuard\n    return (x as ReadableStreamAsyncIteratorInstance<any>)._asyncIteratorImpl instanceof\n      ReadableStreamAsyncIteratorImpl;\n  } catch {\n    return false;\n  }\n}\n\n// Helper functions for the ReadableStream.\n\nfunction streamAsyncIteratorBrandCheckException(name: string): TypeError {\n  return new TypeError(`ReadableStreamAsyncIterator.${name} can only be used on a ReadableSteamAsyncIterator`);\n}\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Polyfill\nconst NumberIsNaN: typeof Number.isNaN = Number.isNaN || function (x) {\n  // eslint-disable-next-line no-self-compare\n  return x !== x;\n};\n\nexport default NumberIsNaN;\n","export function CreateArrayFromList<T extends any[]>(elements: T): T {\n  // We use arrays to represent lists, so this is basically a no-op.\n  // Do a slice though just in case we happen to depend on the unique-ness.\n  return elements.slice() as T;\n}\n\nexport function CopyDataBlockBytes(dest: ArrayBuffer,\n                                   destOffset: number,\n                                   src: ArrayBuffer,\n                                   srcOffset: number,\n                                   n: number) {\n  new Uint8Array(dest).set(new Uint8Array(src, srcOffset, n), destOffset);\n}\n\n// Not implemented correctly\nexport function TransferArrayBuffer<T extends ArrayBufferLike>(O: T): T {\n  return O;\n}\n\n// Not implemented correctly\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nexport function CanTransferArrayBuffer(O: ArrayBufferLike): boolean {\n  return true;\n}\n\n// Not implemented correctly\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nexport function IsDetachedBuffer(O: ArrayBufferLike): boolean {\n  return false;\n}\n\nexport function ArrayBufferSlice(buffer: ArrayBufferLike, begin: number, end: number): ArrayBufferLike {\n  // ArrayBuffer.prototype.slice is not available on IE10\n  // https://www.caniuse.com/mdn-javascript_builtins_arraybuffer_slice\n  if (buffer.slice) {\n    return buffer.slice(begin, end);\n  }\n  const length = end - begin;\n  const slice = new ArrayBuffer(length);\n  CopyDataBlockBytes(slice, 0, buffer, begin, length);\n  return slice;\n}\n","import NumberIsNaN from '../../stub/number-isnan';\nimport { ArrayBufferSlice } from './ecmascript';\n\nexport function IsNonNegativeNumber(v: number): boolean {\n  if (typeof v !== 'number') {\n    return false;\n  }\n\n  if (NumberIsNaN(v)) {\n    return false;\n  }\n\n  if (v < 0) {\n    return false;\n  }\n\n  return true;\n}\n\nexport function CloneAsUint8Array(O: ArrayBufferView): Uint8Array {\n  const buffer = ArrayBufferSlice(O.buffer, O.byteOffset, O.byteOffset + O.byteLength);\n  return new Uint8Array(buffer);\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport { IsNonNegativeNumber } from './miscellaneous';\n\nexport interface QueueContainer<T> {\n  _queue: SimpleQueue<T>;\n  _queueTotalSize: number;\n}\n\nexport interface QueuePair<T> {\n  value: T;\n  size: number;\n}\n\nexport function DequeueValue<T>(container: QueueContainer<QueuePair<T>>): T {\n  assert('_queue' in container && '_queueTotalSize' in container);\n  assert(container._queue.length > 0);\n\n  const pair = container._queue.shift()!;\n  container._queueTotalSize -= pair.size;\n  if (container._queueTotalSize < 0) {\n    container._queueTotalSize = 0;\n  }\n\n  return pair.value;\n}\n\nexport function EnqueueValueWithSize<T>(container: QueueContainer<QueuePair<T>>, value: T, size: number) {\n  assert('_queue' in container && '_queueTotalSize' in container);\n\n  if (!IsNonNegativeNumber(size) || size === Infinity) {\n    throw new RangeError('Size must be a finite, non-NaN, non-negative number.');\n  }\n\n  container._queue.push({ value, size });\n  container._queueTotalSize += size;\n}\n\nexport function PeekQueueValue<T>(container: QueueContainer<QueuePair<T>>): T {\n  assert('_queue' in container && '_queueTotalSize' in container);\n  assert(container._queue.length > 0);\n\n  const pair = container._queue.peek();\n  return pair.value;\n}\n\nexport function ResetQueue<T>(container: QueueContainer<T>) {\n  assert('_queue' in container && '_queueTotalSize' in container);\n\n  container._queue = new SimpleQueue<T>();\n  container._queueTotalSize = 0;\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport { ResetQueue } from '../abstract-ops/queue-with-sizes';\nimport {\n  ReadableStreamAddReadRequest,\n  ReadableStreamFulfillReadRequest,\n  ReadableStreamGetNumReadRequests,\n  ReadableStreamHasDefaultReader,\n  ReadRequest\n} from './default-reader';\nimport {\n  ReadableStreamAddReadIntoRequest,\n  ReadableStreamFulfillReadIntoRequest,\n  ReadableStreamGetNumReadIntoRequests,\n  ReadableStreamHasBYOBReader,\n  ReadIntoRequest\n} from './byob-reader';\nimport NumberIsInteger from '../../stub/number-isinteger';\nimport {\n  IsReadableStreamLocked,\n  ReadableByteStream,\n  ReadableStreamClose,\n  ReadableStreamError\n} from '../readable-stream';\nimport { ValidatedUnderlyingByteSource } from './underlying-source';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport {\n  ArrayBufferSlice,\n  CanTransferArrayBuffer,\n  CopyDataBlockBytes,\n  IsDetachedBuffer,\n  TransferArrayBuffer\n} from '../abstract-ops/ecmascript';\nimport { CancelSteps, PullSteps } from '../abstract-ops/internal-methods';\nimport { promiseResolvedWith, uponPromise } from '../helpers/webidl';\nimport { assertRequiredArgument, convertUnsignedLongLongWithEnforceRange } from '../validators/basic';\n\n/**\n * A pull-into request in a {@link ReadableByteStreamController}.\n *\n * @public\n */\nexport class ReadableStreamBYOBRequest {\n  /** @internal */\n  _associatedReadableByteStreamController!: ReadableByteStreamController;\n  /** @internal */\n  _view!: ArrayBufferView | null;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the view for writing in to, or `null` if the BYOB request has already been responded to.\n   */\n  get view(): ArrayBufferView | null {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('view');\n    }\n\n    return this._view;\n  }\n\n  /**\n   * Indicates to the associated readable byte stream that `bytesWritten` bytes were written into\n   * {@link ReadableStreamBYOBRequest.view | view}, causing the result be surfaced to the consumer.\n   *\n   * After this method is called, {@link ReadableStreamBYOBRequest.view | view} will be transferred and no longer\n   * modifiable.\n   */\n  respond(bytesWritten: number): void;\n  respond(bytesWritten: number | undefined): void {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('respond');\n    }\n    assertRequiredArgument(bytesWritten, 1, 'respond');\n    bytesWritten = convertUnsignedLongLongWithEnforceRange(bytesWritten, 'First parameter');\n\n    if (this._associatedReadableByteStreamController === undefined) {\n      throw new TypeError('This BYOB request has been invalidated');\n    }\n\n    if (IsDetachedBuffer(this._view!.buffer)) {\n      throw new TypeError(`The BYOB request's buffer has been detached and so cannot be used as a response`);\n    }\n\n    assert(this._view!.byteLength > 0);\n    assert(this._view!.buffer.byteLength > 0);\n\n    ReadableByteStreamControllerRespond(this._associatedReadableByteStreamController, bytesWritten);\n  }\n\n  /**\n   * Indicates to the associated readable byte stream that instead of writing into\n   * {@link ReadableStreamBYOBRequest.view | view}, the underlying byte source is providing a new `ArrayBufferView`,\n   * which will be given to the consumer of the readable byte stream.\n   *\n   * After this method is called, `view` will be transferred and no longer modifiable.\n   */\n  respondWithNewView(view: ArrayBufferView): void;\n  respondWithNewView(view: ArrayBufferView | undefined): void {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('respondWithNewView');\n    }\n    assertRequiredArgument(view, 1, 'respondWithNewView');\n\n    if (!ArrayBuffer.isView(view)) {\n      throw new TypeError('You can only respond with array buffer views');\n    }\n\n    if (this._associatedReadableByteStreamController === undefined) {\n      throw new TypeError('This BYOB request has been invalidated');\n    }\n\n    if (IsDetachedBuffer(view.buffer)) {\n      throw new TypeError('The given view\\'s buffer has been detached and so cannot be used as a response');\n    }\n\n    ReadableByteStreamControllerRespondWithNewView(this._associatedReadableByteStreamController, view);\n  }\n}\n\nObject.defineProperties(ReadableStreamBYOBRequest.prototype, {\n  respond: { enumerable: true },\n  respondWithNewView: { enumerable: true },\n  view: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamBYOBRequest.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamBYOBRequest',\n    configurable: true\n  });\n}\n\ninterface ArrayBufferViewConstructor<T extends ArrayBufferView = ArrayBufferView> {\n  new(buffer: ArrayBufferLike, byteOffset: number, length?: number): T;\n\n  readonly prototype: T;\n  readonly BYTES_PER_ELEMENT: number;\n}\n\ninterface ByteQueueElement {\n  buffer: ArrayBufferLike;\n  byteOffset: number;\n  byteLength: number;\n}\n\ntype PullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> =\n  DefaultPullIntoDescriptor\n  | BYOBPullIntoDescriptor<T>;\n\ninterface DefaultPullIntoDescriptor {\n  buffer: ArrayBufferLike;\n  bufferByteLength: number;\n  byteOffset: number;\n  byteLength: number;\n  bytesFilled: number;\n  elementSize: number;\n  viewConstructor: ArrayBufferViewConstructor<Uint8Array>;\n  readerType: 'default';\n}\n\ninterface BYOBPullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> {\n  buffer: ArrayBufferLike;\n  bufferByteLength: number;\n  byteOffset: number;\n  byteLength: number;\n  bytesFilled: number;\n  elementSize: number;\n  viewConstructor: ArrayBufferViewConstructor<T>;\n  readerType: 'byob';\n}\n\n/**\n * Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue.\n *\n * @public\n */\nexport class ReadableByteStreamController {\n  /** @internal */\n  _controlledReadableByteStream!: ReadableByteStream;\n  /** @internal */\n  _queue!: SimpleQueue<ByteQueueElement>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _closeRequested!: boolean;\n  /** @internal */\n  _pullAgain!: boolean;\n  /** @internal */\n  _pulling !: boolean;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _pullAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _cancelAlgorithm!: (reason: any) => Promise<void>;\n  /** @internal */\n  _autoAllocateChunkSize: number | undefined;\n  /** @internal */\n  _byobRequest: ReadableStreamBYOBRequest | null;\n  /** @internal */\n  _pendingPullIntos!: SimpleQueue<PullIntoDescriptor>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the current BYOB pull request, or `null` if there isn't one.\n   */\n  get byobRequest(): ReadableStreamBYOBRequest | null {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('byobRequest');\n    }\n\n    return ReadableByteStreamControllerGetBYOBRequest(this);\n  }\n\n  /**\n   * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is\n   * over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure.\n   */\n  get desiredSize(): number | null {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('desiredSize');\n    }\n\n    return ReadableByteStreamControllerGetDesiredSize(this);\n  }\n\n  /**\n   * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from\n   * the stream, but once those are read, the stream will become closed.\n   */\n  close(): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('close');\n    }\n\n    if (this._closeRequested) {\n      throw new TypeError('The stream has already been closed; do not close it again!');\n    }\n\n    const state = this._controlledReadableByteStream._state;\n    if (state !== 'readable') {\n      throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be closed`);\n    }\n\n    ReadableByteStreamControllerClose(this);\n  }\n\n  /**\n   * Enqueues the given chunk chunk in the controlled readable stream.\n   * The chunk has to be an `ArrayBufferView` instance, or else a `TypeError` will be thrown.\n   */\n  enqueue(chunk: ArrayBufferView): void;\n  enqueue(chunk: ArrayBufferView | undefined): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('enqueue');\n    }\n\n    assertRequiredArgument(chunk, 1, 'enqueue');\n    if (!ArrayBuffer.isView(chunk)) {\n      throw new TypeError('chunk must be an array buffer view');\n    }\n    if (chunk.byteLength === 0) {\n      throw new TypeError('chunk must have non-zero byteLength');\n    }\n    if (chunk.buffer.byteLength === 0) {\n      throw new TypeError(`chunk's buffer must have non-zero byteLength`);\n    }\n\n    if (this._closeRequested) {\n      throw new TypeError('stream is closed or draining');\n    }\n\n    const state = this._controlledReadableByteStream._state;\n    if (state !== 'readable') {\n      throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be enqueued to`);\n    }\n\n    ReadableByteStreamControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.\n   */\n  error(e: any = undefined): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('error');\n    }\n\n    ReadableByteStreamControllerError(this, e);\n  }\n\n  /** @internal */\n  [CancelSteps](reason: any): Promise<void> {\n    ReadableByteStreamControllerClearPendingPullIntos(this);\n\n    ResetQueue(this);\n\n    const result = this._cancelAlgorithm(reason);\n    ReadableByteStreamControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [PullSteps](readRequest: ReadRequest<Uint8Array>): void {\n    const stream = this._controlledReadableByteStream;\n    assert(ReadableStreamHasDefaultReader(stream));\n\n    if (this._queueTotalSize > 0) {\n      assert(ReadableStreamGetNumReadRequests(stream) === 0);\n\n      const entry = this._queue.shift()!;\n      this._queueTotalSize -= entry.byteLength;\n\n      ReadableByteStreamControllerHandleQueueDrain(this);\n\n      const view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);\n\n      readRequest._chunkSteps(view);\n      return;\n    }\n\n    const autoAllocateChunkSize = this._autoAllocateChunkSize;\n    if (autoAllocateChunkSize !== undefined) {\n      let buffer: ArrayBuffer;\n      try {\n        buffer = new ArrayBuffer(autoAllocateChunkSize);\n      } catch (bufferE) {\n        readRequest._errorSteps(bufferE);\n        return;\n      }\n\n      const pullIntoDescriptor: DefaultPullIntoDescriptor = {\n        buffer,\n        bufferByteLength: autoAllocateChunkSize,\n        byteOffset: 0,\n        byteLength: autoAllocateChunkSize,\n        bytesFilled: 0,\n        elementSize: 1,\n        viewConstructor: Uint8Array,\n        readerType: 'default'\n      };\n\n      this._pendingPullIntos.push(pullIntoDescriptor);\n    }\n\n    ReadableStreamAddReadRequest(stream, readRequest);\n    ReadableByteStreamControllerCallPullIfNeeded(this);\n  }\n}\n\nObject.defineProperties(ReadableByteStreamController.prototype, {\n  close: { enumerable: true },\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  byobRequest: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableByteStreamController.prototype, Symbol.toStringTag, {\n    value: 'ReadableByteStreamController',\n    configurable: true\n  });\n}\n\n// Abstract operations for the ReadableByteStreamController.\n\nexport function IsReadableByteStreamController(x: any): x is ReadableByteStreamController {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableByteStream')) {\n    return false;\n  }\n\n  return x instanceof ReadableByteStreamController;\n}\n\nfunction IsReadableStreamBYOBRequest(x: any): x is ReadableStreamBYOBRequest {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_associatedReadableByteStreamController')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamBYOBRequest;\n}\n\nfunction ReadableByteStreamControllerCallPullIfNeeded(controller: ReadableByteStreamController): void {\n  const shouldPull = ReadableByteStreamControllerShouldCallPull(controller);\n  if (!shouldPull) {\n    return;\n  }\n\n  if (controller._pulling) {\n    controller._pullAgain = true;\n    return;\n  }\n\n  assert(!controller._pullAgain);\n\n  controller._pulling = true;\n\n  // TODO: Test controller argument\n  const pullPromise = controller._pullAlgorithm();\n  uponPromise(\n    pullPromise,\n    () => {\n      controller._pulling = false;\n\n      if (controller._pullAgain) {\n        controller._pullAgain = false;\n        ReadableByteStreamControllerCallPullIfNeeded(controller);\n      }\n    },\n    e => {\n      ReadableByteStreamControllerError(controller, e);\n    }\n  );\n}\n\nfunction ReadableByteStreamControllerClearPendingPullIntos(controller: ReadableByteStreamController) {\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n  controller._pendingPullIntos = new SimpleQueue();\n}\n\nfunction ReadableByteStreamControllerCommitPullIntoDescriptor<T extends ArrayBufferView>(\n  stream: ReadableByteStream,\n  pullIntoDescriptor: PullIntoDescriptor<T>\n) {\n  assert(stream._state !== 'errored');\n\n  let done = false;\n  if (stream._state === 'closed') {\n    assert(pullIntoDescriptor.bytesFilled === 0);\n    done = true;\n  }\n\n  const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);\n  if (pullIntoDescriptor.readerType === 'default') {\n    ReadableStreamFulfillReadRequest(stream, filledView as unknown as Uint8Array, done);\n  } else {\n    assert(pullIntoDescriptor.readerType === 'byob');\n    ReadableStreamFulfillReadIntoRequest(stream, filledView, done);\n  }\n}\n\nfunction ReadableByteStreamControllerConvertPullIntoDescriptor<T extends ArrayBufferView>(\n  pullIntoDescriptor: PullIntoDescriptor<T>\n): T {\n  const bytesFilled = pullIntoDescriptor.bytesFilled;\n  const elementSize = pullIntoDescriptor.elementSize;\n\n  assert(bytesFilled <= pullIntoDescriptor.byteLength);\n  assert(bytesFilled % elementSize === 0);\n\n  return new pullIntoDescriptor.viewConstructor(\n    pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize) as T;\n}\n\nfunction ReadableByteStreamControllerEnqueueChunkToQueue(controller: ReadableByteStreamController,\n                                                         buffer: ArrayBufferLike,\n                                                         byteOffset: number,\n                                                         byteLength: number) {\n  controller._queue.push({ buffer, byteOffset, byteLength });\n  controller._queueTotalSize += byteLength;\n}\n\nfunction ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller: ReadableByteStreamController,\n                                                                     pullIntoDescriptor: PullIntoDescriptor) {\n  const elementSize = pullIntoDescriptor.elementSize;\n\n  const currentAlignedBytes = pullIntoDescriptor.bytesFilled - pullIntoDescriptor.bytesFilled % elementSize;\n\n  const maxBytesToCopy = Math.min(controller._queueTotalSize,\n                                  pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled);\n  const maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;\n  const maxAlignedBytes = maxBytesFilled - maxBytesFilled % elementSize;\n\n  let totalBytesToCopyRemaining = maxBytesToCopy;\n  let ready = false;\n  if (maxAlignedBytes > currentAlignedBytes) {\n    totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled;\n    ready = true;\n  }\n\n  const queue = controller._queue;\n\n  while (totalBytesToCopyRemaining > 0) {\n    const headOfQueue = queue.peek();\n\n    const bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength);\n\n    const destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n    CopyDataBlockBytes(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy);\n\n    if (headOfQueue.byteLength === bytesToCopy) {\n      queue.shift();\n    } else {\n      headOfQueue.byteOffset += bytesToCopy;\n      headOfQueue.byteLength -= bytesToCopy;\n    }\n    controller._queueTotalSize -= bytesToCopy;\n\n    ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor);\n\n    totalBytesToCopyRemaining -= bytesToCopy;\n  }\n\n  if (!ready) {\n    assert(controller._queueTotalSize === 0);\n    assert(pullIntoDescriptor.bytesFilled > 0);\n    assert(pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize);\n  }\n\n  return ready;\n}\n\nfunction ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller: ReadableByteStreamController,\n                                                                size: number,\n                                                                pullIntoDescriptor: PullIntoDescriptor) {\n  assert(controller._pendingPullIntos.length === 0 || controller._pendingPullIntos.peek() === pullIntoDescriptor);\n  assert(controller._byobRequest === null);\n  pullIntoDescriptor.bytesFilled += size;\n}\n\nfunction ReadableByteStreamControllerHandleQueueDrain(controller: ReadableByteStreamController) {\n  assert(controller._controlledReadableByteStream._state === 'readable');\n\n  if (controller._queueTotalSize === 0 && controller._closeRequested) {\n    ReadableByteStreamControllerClearAlgorithms(controller);\n    ReadableStreamClose(controller._controlledReadableByteStream);\n  } else {\n    ReadableByteStreamControllerCallPullIfNeeded(controller);\n  }\n}\n\nfunction ReadableByteStreamControllerInvalidateBYOBRequest(controller: ReadableByteStreamController) {\n  if (controller._byobRequest === null) {\n    return;\n  }\n\n  controller._byobRequest._associatedReadableByteStreamController = undefined!;\n  controller._byobRequest._view = null!;\n  controller._byobRequest = null;\n}\n\nfunction ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller: ReadableByteStreamController) {\n  assert(!controller._closeRequested);\n\n  while (controller._pendingPullIntos.length > 0) {\n    if (controller._queueTotalSize === 0) {\n      return;\n    }\n\n    const pullIntoDescriptor = controller._pendingPullIntos.peek();\n\n    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {\n      ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n      ReadableByteStreamControllerCommitPullIntoDescriptor(\n        controller._controlledReadableByteStream,\n        pullIntoDescriptor\n      );\n    }\n  }\n}\n\nexport function ReadableByteStreamControllerPullInto<T extends ArrayBufferView>(\n  controller: ReadableByteStreamController,\n  view: T,\n  readIntoRequest: ReadIntoRequest<T>\n): void {\n  const stream = controller._controlledReadableByteStream;\n\n  let elementSize = 1;\n  if (view.constructor !== DataView) {\n    elementSize = (view.constructor as ArrayBufferViewConstructor<T>).BYTES_PER_ELEMENT;\n  }\n\n  const ctor = view.constructor as ArrayBufferViewConstructor<T>;\n\n  // try {\n  const buffer = TransferArrayBuffer(view.buffer);\n  // } catch (e) {\n  //   readIntoRequest._errorSteps(e);\n  //   return;\n  // }\n\n  const pullIntoDescriptor: BYOBPullIntoDescriptor<T> = {\n    buffer,\n    bufferByteLength: buffer.byteLength,\n    byteOffset: view.byteOffset,\n    byteLength: view.byteLength,\n    bytesFilled: 0,\n    elementSize,\n    viewConstructor: ctor,\n    readerType: 'byob'\n  };\n\n  if (controller._pendingPullIntos.length > 0) {\n    controller._pendingPullIntos.push(pullIntoDescriptor);\n\n    // No ReadableByteStreamControllerCallPullIfNeeded() call since:\n    // - No change happens on desiredSize\n    // - The source has already been notified of that there's at least 1 pending read(view)\n\n    ReadableStreamAddReadIntoRequest(stream, readIntoRequest);\n    return;\n  }\n\n  if (stream._state === 'closed') {\n    const emptyView = new ctor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0);\n    readIntoRequest._closeSteps(emptyView);\n    return;\n  }\n\n  if (controller._queueTotalSize > 0) {\n    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {\n      const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);\n\n      ReadableByteStreamControllerHandleQueueDrain(controller);\n\n      readIntoRequest._chunkSteps(filledView);\n      return;\n    }\n\n    if (controller._closeRequested) {\n      const e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n      ReadableByteStreamControllerError(controller, e);\n\n      readIntoRequest._errorSteps(e);\n      return;\n    }\n  }\n\n  controller._pendingPullIntos.push(pullIntoDescriptor);\n\n  ReadableStreamAddReadIntoRequest<T>(stream, readIntoRequest);\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nfunction ReadableByteStreamControllerRespondInClosedState(controller: ReadableByteStreamController,\n                                                          firstDescriptor: PullIntoDescriptor) {\n  assert(firstDescriptor.bytesFilled === 0);\n\n  const stream = controller._controlledReadableByteStream;\n  if (ReadableStreamHasBYOBReader(stream)) {\n    while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n      const pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);\n      ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);\n    }\n  }\n}\n\nfunction ReadableByteStreamControllerRespondInReadableState(controller: ReadableByteStreamController,\n                                                            bytesWritten: number,\n                                                            pullIntoDescriptor: PullIntoDescriptor) {\n  assert(pullIntoDescriptor.bytesFilled + bytesWritten <= pullIntoDescriptor.byteLength);\n\n  ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor);\n\n  if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {\n    return;\n  }\n\n  ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n  const remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize;\n  if (remainderSize > 0) {\n    const end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n    const remainder = ArrayBufferSlice(pullIntoDescriptor.buffer, end - remainderSize, end);\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength);\n  }\n\n  pullIntoDescriptor.bytesFilled -= remainderSize;\n  ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);\n\n  ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n}\n\nfunction ReadableByteStreamControllerRespondInternal(controller: ReadableByteStreamController, bytesWritten: number) {\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  assert(CanTransferArrayBuffer(firstDescriptor.buffer));\n\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n\n  const state = controller._controlledReadableByteStream._state;\n  if (state === 'closed') {\n    assert(bytesWritten === 0);\n    ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor);\n  } else {\n    assert(state === 'readable');\n    assert(bytesWritten > 0);\n    ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);\n  }\n\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nfunction ReadableByteStreamControllerShiftPendingPullInto(\n  controller: ReadableByteStreamController\n): PullIntoDescriptor {\n  assert(controller._byobRequest === null);\n  const descriptor = controller._pendingPullIntos.shift()!;\n  return descriptor;\n}\n\nfunction ReadableByteStreamControllerShouldCallPull(controller: ReadableByteStreamController): boolean {\n  const stream = controller._controlledReadableByteStream;\n\n  if (stream._state !== 'readable') {\n    return false;\n  }\n\n  if (controller._closeRequested) {\n    return false;\n  }\n\n  if (!controller._started) {\n    return false;\n  }\n\n  if (ReadableStreamHasDefaultReader(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    return true;\n  }\n\n  if (ReadableStreamHasBYOBReader(stream) && ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n    return true;\n  }\n\n  const desiredSize = ReadableByteStreamControllerGetDesiredSize(controller);\n  assert(desiredSize !== null);\n  if (desiredSize! > 0) {\n    return true;\n  }\n\n  return false;\n}\n\nfunction ReadableByteStreamControllerClearAlgorithms(controller: ReadableByteStreamController) {\n  controller._pullAlgorithm = undefined!;\n  controller._cancelAlgorithm = undefined!;\n}\n\n// A client of ReadableByteStreamController may use these functions directly to bypass state check.\n\nexport function ReadableByteStreamControllerClose(controller: ReadableByteStreamController) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (controller._closeRequested || stream._state !== 'readable') {\n    return;\n  }\n\n  if (controller._queueTotalSize > 0) {\n    controller._closeRequested = true;\n\n    return;\n  }\n\n  if (controller._pendingPullIntos.length > 0) {\n    const firstPendingPullInto = controller._pendingPullIntos.peek();\n    if (firstPendingPullInto.bytesFilled > 0) {\n      const e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n      ReadableByteStreamControllerError(controller, e);\n\n      throw e;\n    }\n  }\n\n  ReadableByteStreamControllerClearAlgorithms(controller);\n  ReadableStreamClose(stream);\n}\n\nexport function ReadableByteStreamControllerEnqueue(controller: ReadableByteStreamController, chunk: ArrayBufferView) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (controller._closeRequested || stream._state !== 'readable') {\n    return;\n  }\n\n  const buffer = chunk.buffer;\n  const byteOffset = chunk.byteOffset;\n  const byteLength = chunk.byteLength;\n  if (IsDetachedBuffer(buffer)) {\n    throw new TypeError('chunk\\'s buffer is detached and so cannot be enqueued');\n  }\n  const transferredBuffer = TransferArrayBuffer(buffer);\n\n  if (controller._pendingPullIntos.length > 0) {\n    const firstPendingPullInto = controller._pendingPullIntos.peek();\n    if (IsDetachedBuffer(firstPendingPullInto.buffer)) {\n      throw new TypeError(\n        'The BYOB request\\'s buffer has been detached and so cannot be filled with an enqueued chunk'\n      );\n    }\n    firstPendingPullInto.buffer = TransferArrayBuffer(firstPendingPullInto.buffer);\n  }\n\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n\n  if (ReadableStreamHasDefaultReader(stream)) {\n    if (ReadableStreamGetNumReadRequests(stream) === 0) {\n      assert(controller._pendingPullIntos.length === 0);\n      ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n    } else {\n      assert(controller._queue.length === 0);\n      if (controller._pendingPullIntos.length > 0) {\n        assert(controller._pendingPullIntos.peek().readerType === 'default');\n        ReadableByteStreamControllerShiftPendingPullInto(controller);\n      }\n      const transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength);\n      ReadableStreamFulfillReadRequest(stream, transferredView, false);\n    }\n  } else if (ReadableStreamHasBYOBReader(stream)) {\n    // TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully.\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n    ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n  } else {\n    assert(!IsReadableStreamLocked(stream));\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n  }\n\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nexport function ReadableByteStreamControllerError(controller: ReadableByteStreamController, e: any) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (stream._state !== 'readable') {\n    return;\n  }\n\n  ReadableByteStreamControllerClearPendingPullIntos(controller);\n\n  ResetQueue(controller);\n  ReadableByteStreamControllerClearAlgorithms(controller);\n  ReadableStreamError(stream, e);\n}\n\nexport function ReadableByteStreamControllerGetBYOBRequest(\n  controller: ReadableByteStreamController\n): ReadableStreamBYOBRequest | null {\n  if (controller._byobRequest === null && controller._pendingPullIntos.length > 0) {\n    const firstDescriptor = controller._pendingPullIntos.peek();\n    const view = new Uint8Array(firstDescriptor.buffer,\n                                firstDescriptor.byteOffset + firstDescriptor.bytesFilled,\n                                firstDescriptor.byteLength - firstDescriptor.bytesFilled);\n\n    const byobRequest: ReadableStreamBYOBRequest = Object.create(ReadableStreamBYOBRequest.prototype);\n    SetUpReadableStreamBYOBRequest(byobRequest, controller, view);\n    controller._byobRequest = byobRequest;\n  }\n  return controller._byobRequest;\n}\n\nfunction ReadableByteStreamControllerGetDesiredSize(controller: ReadableByteStreamController): number | null {\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'errored') {\n    return null;\n  }\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\nexport function ReadableByteStreamControllerRespond(controller: ReadableByteStreamController, bytesWritten: number) {\n  assert(controller._pendingPullIntos.length > 0);\n\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'closed') {\n    if (bytesWritten !== 0) {\n      throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream');\n    }\n  } else {\n    assert(state === 'readable');\n    if (bytesWritten === 0) {\n      throw new TypeError('bytesWritten must be greater than 0 when calling respond() on a readable stream');\n    }\n    if (firstDescriptor.bytesFilled + bytesWritten > firstDescriptor.byteLength) {\n      throw new RangeError('bytesWritten out of range');\n    }\n  }\n\n  firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer);\n\n  ReadableByteStreamControllerRespondInternal(controller, bytesWritten);\n}\n\nexport function ReadableByteStreamControllerRespondWithNewView(controller: ReadableByteStreamController,\n                                                               view: ArrayBufferView) {\n  assert(controller._pendingPullIntos.length > 0);\n  assert(!IsDetachedBuffer(view.buffer));\n\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'closed') {\n    if (view.byteLength !== 0) {\n      throw new TypeError('The view\\'s length must be 0 when calling respondWithNewView() on a closed stream');\n    }\n  } else {\n    assert(state === 'readable');\n    if (view.byteLength === 0) {\n      throw new TypeError(\n        'The view\\'s length must be greater than 0 when calling respondWithNewView() on a readable stream'\n      );\n    }\n  }\n\n  if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) {\n    throw new RangeError('The region specified by view does not match byobRequest');\n  }\n  if (firstDescriptor.bufferByteLength !== view.buffer.byteLength) {\n    throw new RangeError('The buffer of view has different capacity than byobRequest');\n  }\n  if (firstDescriptor.bytesFilled + view.byteLength > firstDescriptor.byteLength) {\n    throw new RangeError('The region specified by view is larger than byobRequest');\n  }\n\n  const viewByteLength = view.byteLength;\n  firstDescriptor.buffer = TransferArrayBuffer(view.buffer);\n  ReadableByteStreamControllerRespondInternal(controller, viewByteLength);\n}\n\nexport function SetUpReadableByteStreamController(stream: ReadableByteStream,\n                                                  controller: ReadableByteStreamController,\n                                                  startAlgorithm: () => void | PromiseLike<void>,\n                                                  pullAlgorithm: () => Promise<void>,\n                                                  cancelAlgorithm: (reason: any) => Promise<void>,\n                                                  highWaterMark: number,\n                                                  autoAllocateChunkSize: number | undefined) {\n  assert(stream._readableStreamController === undefined);\n  if (autoAllocateChunkSize !== undefined) {\n    assert(NumberIsInteger(autoAllocateChunkSize));\n    assert(autoAllocateChunkSize > 0);\n  }\n\n  controller._controlledReadableByteStream = stream;\n\n  controller._pullAgain = false;\n  controller._pulling = false;\n\n  controller._byobRequest = null;\n\n  // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n  controller._queue = controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._closeRequested = false;\n  controller._started = false;\n\n  controller._strategyHWM = highWaterMark;\n\n  controller._pullAlgorithm = pullAlgorithm;\n  controller._cancelAlgorithm = cancelAlgorithm;\n\n  controller._autoAllocateChunkSize = autoAllocateChunkSize;\n\n  controller._pendingPullIntos = new SimpleQueue();\n\n  stream._readableStreamController = controller;\n\n  const startResult = startAlgorithm();\n  uponPromise(\n    promiseResolvedWith(startResult),\n    () => {\n      controller._started = true;\n\n      assert(!controller._pulling);\n      assert(!controller._pullAgain);\n\n      ReadableByteStreamControllerCallPullIfNeeded(controller);\n    },\n    r => {\n      ReadableByteStreamControllerError(controller, r);\n    }\n  );\n}\n\nexport function SetUpReadableByteStreamControllerFromUnderlyingSource(\n  stream: ReadableByteStream,\n  underlyingByteSource: ValidatedUnderlyingByteSource,\n  highWaterMark: number\n) {\n  const controller: ReadableByteStreamController = Object.create(ReadableByteStreamController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let pullAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let cancelAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingByteSource.start !== undefined) {\n    startAlgorithm = () => underlyingByteSource.start!(controller);\n  }\n  if (underlyingByteSource.pull !== undefined) {\n    pullAlgorithm = () => underlyingByteSource.pull!(controller);\n  }\n  if (underlyingByteSource.cancel !== undefined) {\n    cancelAlgorithm = reason => underlyingByteSource.cancel!(reason);\n  }\n\n  const autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;\n  if (autoAllocateChunkSize === 0) {\n    throw new TypeError('autoAllocateChunkSize must be greater than 0');\n  }\n\n  SetUpReadableByteStreamController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize\n  );\n}\n\nfunction SetUpReadableStreamBYOBRequest(request: ReadableStreamBYOBRequest,\n                                        controller: ReadableByteStreamController,\n                                        view: ArrayBufferView) {\n  assert(IsReadableByteStreamController(controller));\n  assert(typeof view === 'object');\n  assert(ArrayBuffer.isView(view));\n  assert(!IsDetachedBuffer(view.buffer));\n  request._associatedReadableByteStreamController = controller;\n  request._view = view;\n}\n\n// Helper functions for the ReadableStreamBYOBRequest.\n\nfunction byobRequestBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamBYOBRequest.prototype.${name} can only be used on a ReadableStreamBYOBRequest`);\n}\n\n// Helper functions for the ReadableByteStreamController.\n\nfunction byteStreamControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableByteStreamController.prototype.${name} can only be used on a ReadableByteStreamController`);\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericInitialize,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport { IsReadableStreamLocked, ReadableByteStream, ReadableStream } from '../readable-stream';\nimport {\n  IsReadableByteStreamController,\n  ReadableByteStreamController,\n  ReadableByteStreamControllerPullInto\n} from './byte-stream-controller';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { newPromise, promiseRejectedWith } from '../helpers/webidl';\nimport { assertRequiredArgument } from '../validators/basic';\nimport { assertReadableStream } from '../validators/readable-stream';\nimport { IsDetachedBuffer } from '../abstract-ops/ecmascript';\n\n/**\n * A result returned by {@link ReadableStreamBYOBReader.read}.\n *\n * @public\n */\nexport type ReadableStreamBYOBReadResult<T extends ArrayBufferView> = {\n  done: false;\n  value: T;\n} | {\n  done: true;\n  value: T | undefined;\n};\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamBYOBReader(stream: ReadableByteStream): ReadableStreamBYOBReader {\n  return new ReadableStreamBYOBReader(stream);\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamAddReadIntoRequest<T extends ArrayBufferView>(stream: ReadableByteStream,\n                                                                            readIntoRequest: ReadIntoRequest<T>): void {\n  assert(IsReadableStreamBYOBReader(stream._reader));\n  assert(stream._state === 'readable' || stream._state === 'closed');\n\n  (stream._reader! as ReadableStreamBYOBReader)._readIntoRequests.push(readIntoRequest);\n}\n\nexport function ReadableStreamFulfillReadIntoRequest(stream: ReadableByteStream,\n                                                     chunk: ArrayBufferView,\n                                                     done: boolean) {\n  const reader = stream._reader as ReadableStreamBYOBReader;\n\n  assert(reader._readIntoRequests.length > 0);\n\n  const readIntoRequest = reader._readIntoRequests.shift()!;\n  if (done) {\n    readIntoRequest._closeSteps(chunk);\n  } else {\n    readIntoRequest._chunkSteps(chunk);\n  }\n}\n\nexport function ReadableStreamGetNumReadIntoRequests(stream: ReadableByteStream): number {\n  return (stream._reader as ReadableStreamBYOBReader)._readIntoRequests.length;\n}\n\nexport function ReadableStreamHasBYOBReader(stream: ReadableByteStream): boolean {\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return false;\n  }\n\n  if (!IsReadableStreamBYOBReader(reader)) {\n    return false;\n  }\n\n  return true;\n}\n\n// Readers\n\nexport interface ReadIntoRequest<T extends ArrayBufferView> {\n  _chunkSteps(chunk: T): void;\n\n  _closeSteps(chunk: T | undefined): void;\n\n  _errorSteps(e: any): void;\n}\n\n/**\n * A BYOB reader vended by a {@link ReadableStream}.\n *\n * @public\n */\nexport class ReadableStreamBYOBReader {\n  /** @internal */\n  _ownerReadableStream!: ReadableByteStream;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readIntoRequests: SimpleQueue<ReadIntoRequest<any>>;\n\n  constructor(stream: ReadableByteStream) {\n    assertRequiredArgument(stream, 1, 'ReadableStreamBYOBReader');\n    assertReadableStream(stream, 'First parameter');\n\n    if (IsReadableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n    }\n\n    if (!IsReadableByteStreamController(stream._readableStreamController)) {\n      throw new TypeError('Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte ' +\n        'source');\n    }\n\n    ReadableStreamReaderGenericInitialize(this, stream);\n\n    this._readIntoRequests = new SimpleQueue();\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or\n   * the reader's lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('cancel'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('cancel'));\n    }\n\n    return ReadableStreamReaderGenericCancel(this, reason);\n  }\n\n  /**\n   * Attempts to reads bytes into view, and returns a promise resolved with the result.\n   *\n   * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.\n   */\n  read<T extends ArrayBufferView>(view: T): Promise<ReadableStreamBYOBReadResult<T>> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('read'));\n    }\n\n    if (!ArrayBuffer.isView(view)) {\n      return promiseRejectedWith(new TypeError('view must be an array buffer view'));\n    }\n    if (view.byteLength === 0) {\n      return promiseRejectedWith(new TypeError('view must have non-zero byteLength'));\n    }\n    if (view.buffer.byteLength === 0) {\n      return promiseRejectedWith(new TypeError(`view's buffer must have non-zero byteLength`));\n    }\n    if (IsDetachedBuffer(view.buffer)) {\n      return promiseRejectedWith(new TypeError('view\\'s buffer has been detached'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('read from'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamBYOBReadResult<T>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamBYOBReadResult<T>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readIntoRequest: ReadIntoRequest<T> = {\n      _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),\n      _closeSteps: chunk => resolvePromise({ value: chunk, done: true }),\n      _errorSteps: e => rejectPromise(e)\n    };\n    ReadableStreamBYOBReaderRead(this, view, readIntoRequest);\n    return promise;\n  }\n\n  /**\n   * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.\n   * If the associated stream is errored when the lock is released, the reader will appear errored in the same way\n   * from now on; otherwise, the reader will appear closed.\n   *\n   * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by\n   * the reader's {@link ReadableStreamBYOBReader.read | read()} method has not yet been settled. Attempting to\n   * do so will throw a `TypeError` and leave the reader locked to the stream.\n   */\n  releaseLock(): void {\n    if (!IsReadableStreamBYOBReader(this)) {\n      throw byobReaderBrandCheckException('releaseLock');\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return;\n    }\n\n    if (this._readIntoRequests.length > 0) {\n      throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n    }\n\n    ReadableStreamReaderGenericRelease(this);\n  }\n}\n\nObject.defineProperties(ReadableStreamBYOBReader.prototype, {\n  cancel: { enumerable: true },\n  read: { enumerable: true },\n  releaseLock: { enumerable: true },\n  closed: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamBYOBReader.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamBYOBReader',\n    configurable: true\n  });\n}\n\n// Abstract operations for the readers.\n\nexport function IsReadableStreamBYOBReader(x: any): x is ReadableStreamBYOBReader {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readIntoRequests')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamBYOBReader;\n}\n\nexport function ReadableStreamBYOBReaderRead<T extends ArrayBufferView>(\n  reader: ReadableStreamBYOBReader,\n  view: T,\n  readIntoRequest: ReadIntoRequest<T>\n): void {\n  const stream = reader._ownerReadableStream;\n\n  assert(stream !== undefined);\n\n  stream._disturbed = true;\n\n  if (stream._state === 'errored') {\n    readIntoRequest._errorSteps(stream._storedError);\n  } else {\n    ReadableByteStreamControllerPullInto(\n      stream._readableStreamController as ReadableByteStreamController,\n      view,\n      readIntoRequest\n    );\n  }\n}\n\n// Helper functions for the ReadableStreamBYOBReader.\n\nfunction byobReaderBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamBYOBReader.prototype.${name} can only be used on a ReadableStreamBYOBReader`);\n}\n","import { QueuingStrategy, QueuingStrategySizeCallback } from '../queuing-strategy';\nimport NumberIsNaN from '../../stub/number-isnan';\n\nexport function ExtractHighWaterMark(strategy: QueuingStrategy, defaultHWM: number): number {\n  const { highWaterMark } = strategy;\n\n  if (highWaterMark === undefined) {\n    return defaultHWM;\n  }\n\n  if (NumberIsNaN(highWaterMark) || highWaterMark < 0) {\n    throw new RangeError('Invalid highWaterMark');\n  }\n\n  return highWaterMark;\n}\n\nexport function ExtractSizeAlgorithm<T>(strategy: QueuingStrategy<T>): QueuingStrategySizeCallback<T> {\n  const { size } = strategy;\n\n  if (!size) {\n    return () => 1;\n  }\n\n  return size;\n}\n","import { QueuingStrategy, QueuingStrategySizeCallback } from '../queuing-strategy';\nimport { assertDictionary, assertFunction, convertUnrestrictedDouble } from './basic';\n\nexport function convertQueuingStrategy<T>(init: QueuingStrategy<T> | null | undefined,\n                                          context: string): QueuingStrategy<T> {\n  assertDictionary(init, context);\n  const highWaterMark = init?.highWaterMark;\n  const size = init?.size;\n  return {\n    highWaterMark: highWaterMark === undefined ? undefined : convertUnrestrictedDouble(highWaterMark),\n    size: size === undefined ? undefined : convertQueuingStrategySize(size, `${context} has member 'size' that`)\n  };\n}\n\nfunction convertQueuingStrategySize<T>(fn: QueuingStrategySizeCallback<T>,\n                                       context: string): QueuingStrategySizeCallback<T> {\n  assertFunction(fn, context);\n  return chunk => convertUnrestrictedDouble(fn(chunk));\n}\n","import { assertDictionary, assertFunction } from './basic';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\nimport {\n  UnderlyingSink,\n  UnderlyingSinkAbortCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  ValidatedUnderlyingSink\n} from '../writable-stream/underlying-sink';\nimport { WritableStreamDefaultController } from '../writable-stream';\n\nexport function convertUnderlyingSink<W>(original: UnderlyingSink<W> | null,\n                                         context: string): ValidatedUnderlyingSink<W> {\n  assertDictionary(original, context);\n  const abort = original?.abort;\n  const close = original?.close;\n  const start = original?.start;\n  const type = original?.type;\n  const write = original?.write;\n  return {\n    abort: abort === undefined ?\n      undefined :\n      convertUnderlyingSinkAbortCallback(abort, original!, `${context} has member 'abort' that`),\n    close: close === undefined ?\n      undefined :\n      convertUnderlyingSinkCloseCallback(close, original!, `${context} has member 'close' that`),\n    start: start === undefined ?\n      undefined :\n      convertUnderlyingSinkStartCallback(start, original!, `${context} has member 'start' that`),\n    write: write === undefined ?\n      undefined :\n      convertUnderlyingSinkWriteCallback(write, original!, `${context} has member 'write' that`),\n    type\n  };\n}\n\nfunction convertUnderlyingSinkAbortCallback(\n  fn: UnderlyingSinkAbortCallback,\n  original: UnderlyingSink,\n  context: string\n): (reason: any) => Promise<void> {\n  assertFunction(fn, context);\n  return (reason: any) => promiseCall(fn, original, [reason]);\n}\n\nfunction convertUnderlyingSinkCloseCallback(\n  fn: UnderlyingSinkCloseCallback,\n  original: UnderlyingSink,\n  context: string\n): () => Promise<void> {\n  assertFunction(fn, context);\n  return () => promiseCall(fn, original, []);\n}\n\nfunction convertUnderlyingSinkStartCallback(\n  fn: UnderlyingSinkStartCallback,\n  original: UnderlyingSink,\n  context: string\n): UnderlyingSinkStartCallback {\n  assertFunction(fn, context);\n  return (controller: WritableStreamDefaultController) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertUnderlyingSinkWriteCallback<W>(\n  fn: UnderlyingSinkWriteCallback<W>,\n  original: UnderlyingSink<W>,\n  context: string\n): (chunk: W, controller: WritableStreamDefaultController) => Promise<void> {\n  assertFunction(fn, context);\n  return (chunk: W, controller: WritableStreamDefaultController) => promiseCall(fn, original, [chunk, controller]);\n}\n","import { IsWritableStream, WritableStream } from '../writable-stream';\n\nexport function assertWritableStream(x: unknown, context: string): asserts x is WritableStream {\n  if (!IsWritableStream(x)) {\n    throw new TypeError(`${context} is not a WritableStream.`);\n  }\n}\n","/**\n * A signal object that allows you to communicate with a request and abort it if required\n * via its associated `AbortController` object.\n *\n * @remarks\n *   This interface is compatible with the `AbortSignal` interface defined in TypeScript's DOM types.\n *   It is redefined here, so it can be polyfilled without a DOM, for example with\n *   {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.\n *\n * @public\n */\nexport interface AbortSignal {\n  /**\n   * Whether the request is aborted.\n   */\n  readonly aborted: boolean;\n\n  /**\n   * Add an event listener to be triggered when this signal becomes aborted.\n   */\n  addEventListener(type: 'abort', listener: () => void): void;\n\n  /**\n   * Remove an event listener that was previously added with {@link AbortSignal.addEventListener}.\n   */\n  removeEventListener(type: 'abort', listener: () => void): void;\n}\n\nexport function isAbortSignal(value: unknown): value is AbortSignal {\n  if (typeof value !== 'object' || value === null) {\n    return false;\n  }\n  try {\n    return typeof (value as AbortSignal).aborted === 'boolean';\n  } catch {\n    // AbortSignal.prototype.aborted throws if its brand check fails\n    return false;\n  }\n}\n\n/**\n * A controller object that allows you to abort an `AbortSignal` when desired.\n *\n * @remarks\n *   This interface is compatible with the `AbortController` interface defined in TypeScript's DOM types.\n *   It is redefined here, so it can be polyfilled without a DOM, for example with\n *   {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.\n *\n * @internal\n */\nexport interface AbortController {\n  readonly signal: AbortSignal;\n\n  abort(): void;\n}\n\ninterface AbortControllerConstructor {\n  new(): AbortController;\n}\n\nconst supportsAbortController = typeof (AbortController as any) === 'function';\n\n/**\n * Construct a new AbortController, if supported by the platform.\n *\n * @internal\n */\nexport function createAbortController(): AbortController | undefined {\n  if (supportsAbortController) {\n    return new (AbortController as AbortControllerConstructor)();\n  }\n  return undefined;\n}\n","import assert from '../stub/assert';\nimport {\n  newPromise,\n  promiseRejectedWith,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  uponPromise\n} from './helpers/webidl';\nimport {\n  DequeueValue,\n  EnqueueValueWithSize,\n  PeekQueueValue,\n  QueuePair,\n  ResetQueue\n} from './abstract-ops/queue-with-sizes';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { SimpleQueue } from './simple-queue';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { AbortSteps, ErrorSteps } from './abstract-ops/internal-methods';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport {\n  UnderlyingSink,\n  UnderlyingSinkAbortCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  ValidatedUnderlyingSink\n} from './writable-stream/underlying-sink';\nimport { assertObject, assertRequiredArgument } from './validators/basic';\nimport { convertUnderlyingSink } from './validators/underlying-sink';\nimport { assertWritableStream } from './validators/writable-stream';\nimport { AbortController, AbortSignal, createAbortController } from './abort-signal';\n\ntype WritableStreamState = 'writable' | 'closed' | 'erroring' | 'errored';\n\ninterface WriteOrCloseRequest {\n  _resolve: (value?: undefined) => void;\n  _reject: (reason: any) => void;\n}\n\ntype WriteRequest = WriteOrCloseRequest;\ntype CloseRequest = WriteOrCloseRequest;\n\ninterface PendingAbortRequest {\n  _promise: Promise<undefined>;\n  _resolve: (value?: undefined) => void;\n  _reject: (reason: any) => void;\n  _reason: any;\n  _wasAlreadyErroring: boolean;\n}\n\n/**\n * A writable stream represents a destination for data, into which you can write.\n *\n * @public\n */\nclass WritableStream<W = any> {\n  /** @internal */\n  _state!: WritableStreamState;\n  /** @internal */\n  _storedError: any;\n  /** @internal */\n  _writer: WritableStreamDefaultWriter<W> | undefined;\n  /** @internal */\n  _writableStreamController!: WritableStreamDefaultController<W>;\n  /** @internal */\n  _writeRequests!: SimpleQueue<WriteRequest>;\n  /** @internal */\n  _inFlightWriteRequest: WriteRequest | undefined;\n  /** @internal */\n  _closeRequest: CloseRequest | undefined;\n  /** @internal */\n  _inFlightCloseRequest: CloseRequest | undefined;\n  /** @internal */\n  _pendingAbortRequest: PendingAbortRequest | undefined;\n  /** @internal */\n  _backpressure!: boolean;\n\n  constructor(underlyingSink?: UnderlyingSink<W>, strategy?: QueuingStrategy<W>);\n  constructor(rawUnderlyingSink: UnderlyingSink<W> | null | undefined = {},\n              rawStrategy: QueuingStrategy<W> | null | undefined = {}) {\n    if (rawUnderlyingSink === undefined) {\n      rawUnderlyingSink = null;\n    } else {\n      assertObject(rawUnderlyingSink, 'First parameter');\n    }\n\n    const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');\n    const underlyingSink = convertUnderlyingSink(rawUnderlyingSink, 'First parameter');\n\n    InitializeWritableStream(this);\n\n    const type = underlyingSink.type;\n    if (type !== undefined) {\n      throw new RangeError('Invalid type is specified');\n    }\n\n    const sizeAlgorithm = ExtractSizeAlgorithm(strategy);\n    const highWaterMark = ExtractHighWaterMark(strategy, 1);\n\n    SetUpWritableStreamDefaultControllerFromUnderlyingSink(this, underlyingSink, highWaterMark, sizeAlgorithm);\n  }\n\n  /**\n   * Returns whether or not the writable stream is locked to a writer.\n   */\n  get locked(): boolean {\n    if (!IsWritableStream(this)) {\n      throw streamBrandCheckException('locked');\n    }\n\n    return IsWritableStreamLocked(this);\n  }\n\n  /**\n   * Aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be\n   * immediately moved to an errored state, with any queued-up writes discarded. This will also execute any abort\n   * mechanism of the underlying sink.\n   *\n   * The returned promise will fulfill if the stream shuts down successfully, or reject if the underlying sink signaled\n   * that there was an error doing so. Additionally, it will reject with a `TypeError` (without attempting to cancel\n   * the stream) if the stream is currently locked.\n   */\n  abort(reason: any = undefined): Promise<void> {\n    if (!IsWritableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('abort'));\n    }\n\n    if (IsWritableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot abort a stream that already has a writer'));\n    }\n\n    return WritableStreamAbort(this, reason);\n  }\n\n  /**\n   * Closes the stream. The underlying sink will finish processing any previously-written chunks, before invoking its\n   * close behavior. During this time any further attempts to write will fail (without erroring the stream).\n   *\n   * The method returns a promise that will fulfill if all remaining chunks are successfully written and the stream\n   * successfully closes, or rejects if an error is encountered during this process. Additionally, it will reject with\n   * a `TypeError` (without attempting to cancel the stream) if the stream is currently locked.\n   */\n  close() {\n    if (!IsWritableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('close'));\n    }\n\n    if (IsWritableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot close a stream that already has a writer'));\n    }\n\n    if (WritableStreamCloseQueuedOrInFlight(this)) {\n      return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));\n    }\n\n    return WritableStreamClose(this);\n  }\n\n  /**\n   * Creates a {@link WritableStreamDefaultWriter | writer} and locks the stream to the new writer. While the stream\n   * is locked, no other writer can be acquired until this one is released.\n   *\n   * This functionality is especially useful for creating abstractions that desire the ability to write to a stream\n   * without interruption or interleaving. By getting a writer for the stream, you can ensure nobody else can write at\n   * the same time, which would cause the resulting written data to be unpredictable and probably useless.\n   */\n  getWriter(): WritableStreamDefaultWriter<W> {\n    if (!IsWritableStream(this)) {\n      throw streamBrandCheckException('getWriter');\n    }\n\n    return AcquireWritableStreamDefaultWriter(this);\n  }\n}\n\nObject.defineProperties(WritableStream.prototype, {\n  abort: { enumerable: true },\n  close: { enumerable: true },\n  getWriter: { enumerable: true },\n  locked: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStream.prototype, Symbol.toStringTag, {\n    value: 'WritableStream',\n    configurable: true\n  });\n}\n\nexport {\n  AcquireWritableStreamDefaultWriter,\n  CreateWritableStream,\n  IsWritableStream,\n  IsWritableStreamLocked,\n  WritableStream,\n  WritableStreamAbort,\n  WritableStreamDefaultControllerErrorIfNeeded,\n  WritableStreamDefaultWriterCloseWithErrorPropagation,\n  WritableStreamDefaultWriterRelease,\n  WritableStreamDefaultWriterWrite,\n  WritableStreamCloseQueuedOrInFlight,\n  UnderlyingSink,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkAbortCallback\n};\n\n// Abstract operations for the WritableStream.\n\nfunction AcquireWritableStreamDefaultWriter<W>(stream: WritableStream<W>): WritableStreamDefaultWriter<W> {\n  return new WritableStreamDefaultWriter(stream);\n}\n\n// Throws if and only if startAlgorithm throws.\nfunction CreateWritableStream<W>(startAlgorithm: () => void | PromiseLike<void>,\n                                 writeAlgorithm: (chunk: W) => Promise<void>,\n                                 closeAlgorithm: () => Promise<void>,\n                                 abortAlgorithm: (reason: any) => Promise<void>,\n                                 highWaterMark = 1,\n                                 sizeAlgorithm: QueuingStrategySizeCallback<W> = () => 1) {\n  assert(IsNonNegativeNumber(highWaterMark));\n\n  const stream: WritableStream<W> = Object.create(WritableStream.prototype);\n  InitializeWritableStream(stream);\n\n  const controller: WritableStreamDefaultController<W> = Object.create(WritableStreamDefaultController.prototype);\n\n  SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm,\n                                       abortAlgorithm, highWaterMark, sizeAlgorithm);\n  return stream;\n}\n\nfunction InitializeWritableStream<W>(stream: WritableStream<W>) {\n  stream._state = 'writable';\n\n  // The error that will be reported by new method calls once the state becomes errored. Only set when [[state]] is\n  // 'erroring' or 'errored'. May be set to an undefined value.\n  stream._storedError = undefined;\n\n  stream._writer = undefined;\n\n  // Initialize to undefined first because the constructor of the controller checks this\n  // variable to validate the caller.\n  stream._writableStreamController = undefined!;\n\n  // This queue is placed here instead of the writer class in order to allow for passing a writer to the next data\n  // producer without waiting for the queued writes to finish.\n  stream._writeRequests = new SimpleQueue();\n\n  // Write requests are removed from _writeRequests when write() is called on the underlying sink. This prevents\n  // them from being erroneously rejected on error. If a write() call is in-flight, the request is stored here.\n  stream._inFlightWriteRequest = undefined;\n\n  // The promise that was returned from writer.close(). Stored here because it may be fulfilled after the writer\n  // has been detached.\n  stream._closeRequest = undefined;\n\n  // Close request is removed from _closeRequest when close() is called on the underlying sink. This prevents it\n  // from being erroneously rejected on error. If a close() call is in-flight, the request is stored here.\n  stream._inFlightCloseRequest = undefined;\n\n  // The promise that was returned from writer.abort(). This may also be fulfilled after the writer has detached.\n  stream._pendingAbortRequest = undefined;\n\n  // The backpressure signal set by the controller.\n  stream._backpressure = false;\n}\n\nfunction IsWritableStream(x: unknown): x is WritableStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_writableStreamController')) {\n    return false;\n  }\n\n  return x instanceof WritableStream;\n}\n\nfunction IsWritableStreamLocked(stream: WritableStream): boolean {\n  assert(IsWritableStream(stream));\n\n  if (stream._writer === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamAbort(stream: WritableStream, reason: any): Promise<undefined> {\n  if (stream._state === 'closed' || stream._state === 'errored') {\n    return promiseResolvedWith(undefined);\n  }\n  stream._writableStreamController._abortReason = reason;\n  stream._writableStreamController._abortController?.abort();\n\n  // TypeScript narrows the type of `stream._state` down to 'writable' | 'erroring',\n  // but it doesn't know that signaling abort runs author code that might have changed the state.\n  // Widen the type again by casting to WritableStreamState.\n  const state = stream._state as WritableStreamState;\n\n  if (state === 'closed' || state === 'errored') {\n    return promiseResolvedWith(undefined);\n  }\n  if (stream._pendingAbortRequest !== undefined) {\n    return stream._pendingAbortRequest._promise;\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n\n  let wasAlreadyErroring = false;\n  if (state === 'erroring') {\n    wasAlreadyErroring = true;\n    // reason will not be used, so don't keep a reference to it.\n    reason = undefined;\n  }\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    stream._pendingAbortRequest = {\n      _promise: undefined!,\n      _resolve: resolve,\n      _reject: reject,\n      _reason: reason,\n      _wasAlreadyErroring: wasAlreadyErroring\n    };\n  });\n  stream._pendingAbortRequest!._promise = promise;\n\n  if (!wasAlreadyErroring) {\n    WritableStreamStartErroring(stream, reason);\n  }\n\n  return promise;\n}\n\nfunction WritableStreamClose(stream: WritableStream<any>): Promise<undefined> {\n  const state = stream._state;\n  if (state === 'closed' || state === 'errored') {\n    return promiseRejectedWith(new TypeError(\n      `The stream (in ${state} state) is not in the writable state and cannot be closed`));\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n  assert(!WritableStreamCloseQueuedOrInFlight(stream));\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    const closeRequest: CloseRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._closeRequest = closeRequest;\n  });\n\n  const writer = stream._writer;\n  if (writer !== undefined && stream._backpressure && state === 'writable') {\n    defaultWriterReadyPromiseResolve(writer);\n  }\n\n  WritableStreamDefaultControllerClose(stream._writableStreamController);\n\n  return promise;\n}\n\n// WritableStream API exposed for controllers.\n\nfunction WritableStreamAddWriteRequest(stream: WritableStream): Promise<undefined> {\n  assert(IsWritableStreamLocked(stream));\n  assert(stream._state === 'writable');\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    const writeRequest: WriteRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._writeRequests.push(writeRequest);\n  });\n\n  return promise;\n}\n\nfunction WritableStreamDealWithRejection(stream: WritableStream, error: any) {\n  const state = stream._state;\n\n  if (state === 'writable') {\n    WritableStreamStartErroring(stream, error);\n    return;\n  }\n\n  assert(state === 'erroring');\n  WritableStreamFinishErroring(stream);\n}\n\nfunction WritableStreamStartErroring(stream: WritableStream, reason: any) {\n  assert(stream._storedError === undefined);\n  assert(stream._state === 'writable');\n\n  const controller = stream._writableStreamController;\n  assert(controller !== undefined);\n\n  stream._state = 'erroring';\n  stream._storedError = reason;\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);\n  }\n\n  if (!WritableStreamHasOperationMarkedInFlight(stream) && controller._started) {\n    WritableStreamFinishErroring(stream);\n  }\n}\n\nfunction WritableStreamFinishErroring(stream: WritableStream) {\n  assert(stream._state === 'erroring');\n  assert(!WritableStreamHasOperationMarkedInFlight(stream));\n  stream._state = 'errored';\n  stream._writableStreamController[ErrorSteps]();\n\n  const storedError = stream._storedError;\n  stream._writeRequests.forEach(writeRequest => {\n    writeRequest._reject(storedError);\n  });\n  stream._writeRequests = new SimpleQueue();\n\n  if (stream._pendingAbortRequest === undefined) {\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    return;\n  }\n\n  const abortRequest = stream._pendingAbortRequest;\n  stream._pendingAbortRequest = undefined;\n\n  if (abortRequest._wasAlreadyErroring) {\n    abortRequest._reject(storedError);\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    return;\n  }\n\n  const promise = stream._writableStreamController[AbortSteps](abortRequest._reason);\n  uponPromise(\n    promise,\n    () => {\n      abortRequest._resolve();\n      WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    },\n    (reason: any) => {\n      abortRequest._reject(reason);\n      WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    });\n}\n\nfunction WritableStreamFinishInFlightWrite(stream: WritableStream) {\n  assert(stream._inFlightWriteRequest !== undefined);\n  stream._inFlightWriteRequest!._resolve(undefined);\n  stream._inFlightWriteRequest = undefined;\n}\n\nfunction WritableStreamFinishInFlightWriteWithError(stream: WritableStream, error: any) {\n  assert(stream._inFlightWriteRequest !== undefined);\n  stream._inFlightWriteRequest!._reject(error);\n  stream._inFlightWriteRequest = undefined;\n\n  assert(stream._state === 'writable' || stream._state === 'erroring');\n\n  WritableStreamDealWithRejection(stream, error);\n}\n\nfunction WritableStreamFinishInFlightClose(stream: WritableStream) {\n  assert(stream._inFlightCloseRequest !== undefined);\n  stream._inFlightCloseRequest!._resolve(undefined);\n  stream._inFlightCloseRequest = undefined;\n\n  const state = stream._state;\n\n  assert(state === 'writable' || state === 'erroring');\n\n  if (state === 'erroring') {\n    // The error was too late to do anything, so it is ignored.\n    stream._storedError = undefined;\n    if (stream._pendingAbortRequest !== undefined) {\n      stream._pendingAbortRequest._resolve();\n      stream._pendingAbortRequest = undefined;\n    }\n  }\n\n  stream._state = 'closed';\n\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    defaultWriterClosedPromiseResolve(writer);\n  }\n\n  assert(stream._pendingAbortRequest === undefined);\n  assert(stream._storedError === undefined);\n}\n\nfunction WritableStreamFinishInFlightCloseWithError(stream: WritableStream, error: any) {\n  assert(stream._inFlightCloseRequest !== undefined);\n  stream._inFlightCloseRequest!._reject(error);\n  stream._inFlightCloseRequest = undefined;\n\n  assert(stream._state === 'writable' || stream._state === 'erroring');\n\n  // Never execute sink abort() after sink close().\n  if (stream._pendingAbortRequest !== undefined) {\n    stream._pendingAbortRequest._reject(error);\n    stream._pendingAbortRequest = undefined;\n  }\n  WritableStreamDealWithRejection(stream, error);\n}\n\n// TODO(ricea): Fix alphabetical order.\nfunction WritableStreamCloseQueuedOrInFlight(stream: WritableStream): boolean {\n  if (stream._closeRequest === undefined && stream._inFlightCloseRequest === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamHasOperationMarkedInFlight(stream: WritableStream): boolean {\n  if (stream._inFlightWriteRequest === undefined && stream._inFlightCloseRequest === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamMarkCloseRequestInFlight(stream: WritableStream) {\n  assert(stream._inFlightCloseRequest === undefined);\n  assert(stream._closeRequest !== undefined);\n  stream._inFlightCloseRequest = stream._closeRequest;\n  stream._closeRequest = undefined;\n}\n\nfunction WritableStreamMarkFirstWriteRequestInFlight(stream: WritableStream) {\n  assert(stream._inFlightWriteRequest === undefined);\n  assert(stream._writeRequests.length !== 0);\n  stream._inFlightWriteRequest = stream._writeRequests.shift();\n}\n\nfunction WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream: WritableStream) {\n  assert(stream._state === 'errored');\n  if (stream._closeRequest !== undefined) {\n    assert(stream._inFlightCloseRequest === undefined);\n\n    stream._closeRequest._reject(stream._storedError);\n    stream._closeRequest = undefined;\n  }\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    defaultWriterClosedPromiseReject(writer, stream._storedError);\n  }\n}\n\nfunction WritableStreamUpdateBackpressure(stream: WritableStream, backpressure: boolean) {\n  assert(stream._state === 'writable');\n  assert(!WritableStreamCloseQueuedOrInFlight(stream));\n\n  const writer = stream._writer;\n  if (writer !== undefined && backpressure !== stream._backpressure) {\n    if (backpressure) {\n      defaultWriterReadyPromiseReset(writer);\n    } else {\n      assert(!backpressure);\n\n      defaultWriterReadyPromiseResolve(writer);\n    }\n  }\n\n  stream._backpressure = backpressure;\n}\n\n/**\n * A default writer vended by a {@link WritableStream}.\n *\n * @public\n */\nexport class WritableStreamDefaultWriter<W = any> {\n  /** @internal */\n  _ownerWritableStream: WritableStream<W>;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _closedPromiseState!: 'pending' | 'resolved' | 'rejected';\n  /** @internal */\n  _readyPromise!: Promise<undefined>;\n  /** @internal */\n  _readyPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _readyPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readyPromiseState!: 'pending' | 'fulfilled' | 'rejected';\n\n  constructor(stream: WritableStream<W>) {\n    assertRequiredArgument(stream, 1, 'WritableStreamDefaultWriter');\n    assertWritableStream(stream, 'First parameter');\n\n    if (IsWritableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive writing by another writer');\n    }\n\n    this._ownerWritableStream = stream;\n    stream._writer = this;\n\n    const state = stream._state;\n\n    if (state === 'writable') {\n      if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._backpressure) {\n        defaultWriterReadyPromiseInitialize(this);\n      } else {\n        defaultWriterReadyPromiseInitializeAsResolved(this);\n      }\n\n      defaultWriterClosedPromiseInitialize(this);\n    } else if (state === 'erroring') {\n      defaultWriterReadyPromiseInitializeAsRejected(this, stream._storedError);\n      defaultWriterClosedPromiseInitialize(this);\n    } else if (state === 'closed') {\n      defaultWriterReadyPromiseInitializeAsResolved(this);\n      defaultWriterClosedPromiseInitializeAsResolved(this);\n    } else {\n      assert(state === 'errored');\n\n      const storedError = stream._storedError;\n      defaultWriterReadyPromiseInitializeAsRejected(this, storedError);\n      defaultWriterClosedPromiseInitializeAsRejected(this, storedError);\n    }\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or\n   * the writer’s lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * Returns the desired size to fill the stream’s internal queue. It can be negative, if the queue is over-full.\n   * A producer can use this information to determine the right amount of data to write.\n   *\n   * It will be `null` if the stream cannot be successfully written to (due to either being errored, or having an abort\n   * queued up). It will return zero if the stream is closed. And the getter will throw an exception if invoked when\n   * the writer’s lock is released.\n   */\n  get desiredSize(): number | null {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      throw defaultWriterBrandCheckException('desiredSize');\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      throw defaultWriterLockException('desiredSize');\n    }\n\n    return WritableStreamDefaultWriterGetDesiredSize(this);\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the desired size to fill the stream’s internal queue transitions\n   * from non-positive to positive, signaling that it is no longer applying backpressure. Once the desired size dips\n   * back to zero or below, the getter will return a new promise that stays pending until the next transition.\n   *\n   * If the stream becomes errored or aborted, or the writer’s lock is released, the returned promise will become\n   * rejected.\n   */\n  get ready(): Promise<undefined> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('ready'));\n    }\n\n    return this._readyPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link WritableStream.abort | stream.abort(reason)}.\n   */\n  abort(reason: any = undefined): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('abort'));\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('abort'));\n    }\n\n    return WritableStreamDefaultWriterAbort(this, reason);\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link WritableStream.close | stream.close()}.\n   */\n  close(): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('close'));\n    }\n\n    const stream = this._ownerWritableStream;\n\n    if (stream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('close'));\n    }\n\n    if (WritableStreamCloseQueuedOrInFlight(stream)) {\n      return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));\n    }\n\n    return WritableStreamDefaultWriterClose(this);\n  }\n\n  /**\n   * Releases the writer’s lock on the corresponding stream. After the lock is released, the writer is no longer active.\n   * If the associated stream is errored when the lock is released, the writer will appear errored in the same way from\n   * now on; otherwise, the writer will appear closed.\n   *\n   * Note that the lock can still be released even if some ongoing writes have not yet finished (i.e. even if the\n   * promises returned from previous calls to {@link WritableStreamDefaultWriter.write | write()} have not yet settled).\n   * It’s not necessary to hold the lock on the writer for the duration of the write; the lock instead simply prevents\n   * other producers from writing in an interleaved manner.\n   */\n  releaseLock(): void {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      throw defaultWriterBrandCheckException('releaseLock');\n    }\n\n    const stream = this._ownerWritableStream;\n\n    if (stream === undefined) {\n      return;\n    }\n\n    assert(stream._writer !== undefined);\n\n    WritableStreamDefaultWriterRelease(this);\n  }\n\n  /**\n   * Writes the given chunk to the writable stream, by waiting until any previous writes have finished successfully,\n   * and then sending the chunk to the underlying sink's {@link UnderlyingSink.write | write()} method. It will return\n   * a promise that fulfills with undefined upon a successful write, or rejects if the write fails or stream becomes\n   * errored before the writing process is initiated.\n   *\n   * Note that what \"success\" means is up to the underlying sink; it might indicate simply that the chunk has been\n   * accepted, and not necessarily that it is safely saved to its ultimate destination.\n   */\n  write(chunk: W): Promise<void>;\n  write(chunk: W = undefined!): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('write'));\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('write to'));\n    }\n\n    return WritableStreamDefaultWriterWrite(this, chunk);\n  }\n}\n\nObject.defineProperties(WritableStreamDefaultWriter.prototype, {\n  abort: { enumerable: true },\n  close: { enumerable: true },\n  releaseLock: { enumerable: true },\n  write: { enumerable: true },\n  closed: { enumerable: true },\n  desiredSize: { enumerable: true },\n  ready: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStreamDefaultWriter.prototype, Symbol.toStringTag, {\n    value: 'WritableStreamDefaultWriter',\n    configurable: true\n  });\n}\n\n// Abstract operations for the WritableStreamDefaultWriter.\n\nfunction IsWritableStreamDefaultWriter<W = any>(x: any): x is WritableStreamDefaultWriter<W> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) {\n    return false;\n  }\n\n  return x instanceof WritableStreamDefaultWriter;\n}\n\n// A client of WritableStreamDefaultWriter may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultWriterAbort(writer: WritableStreamDefaultWriter, reason: any) {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  return WritableStreamAbort(stream, reason);\n}\n\nfunction WritableStreamDefaultWriterClose(writer: WritableStreamDefaultWriter): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  return WritableStreamClose(stream);\n}\n\nfunction WritableStreamDefaultWriterCloseWithErrorPropagation(writer: WritableStreamDefaultWriter): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  const state = stream._state;\n  if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {\n    return promiseResolvedWith(undefined);\n  }\n\n  if (state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n\n  return WritableStreamDefaultWriterClose(writer);\n}\n\nfunction WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer: WritableStreamDefaultWriter, error: any) {\n  if (writer._closedPromiseState === 'pending') {\n    defaultWriterClosedPromiseReject(writer, error);\n  } else {\n    defaultWriterClosedPromiseResetToRejected(writer, error);\n  }\n}\n\nfunction WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer: WritableStreamDefaultWriter, error: any) {\n  if (writer._readyPromiseState === 'pending') {\n    defaultWriterReadyPromiseReject(writer, error);\n  } else {\n    defaultWriterReadyPromiseResetToRejected(writer, error);\n  }\n}\n\nfunction WritableStreamDefaultWriterGetDesiredSize(writer: WritableStreamDefaultWriter): number | null {\n  const stream = writer._ownerWritableStream;\n  const state = stream._state;\n\n  if (state === 'errored' || state === 'erroring') {\n    return null;\n  }\n\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return WritableStreamDefaultControllerGetDesiredSize(stream._writableStreamController);\n}\n\nfunction WritableStreamDefaultWriterRelease(writer: WritableStreamDefaultWriter) {\n  const stream = writer._ownerWritableStream;\n  assert(stream !== undefined);\n  assert(stream._writer === writer);\n\n  const releasedError = new TypeError(\n    `Writer was released and can no longer be used to monitor the stream's closedness`);\n\n  WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, releasedError);\n\n  // The state transitions to \"errored\" before the sink abort() method runs, but the writer.closed promise is not\n  // rejected until afterwards. This means that simply testing state will not work.\n  WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, releasedError);\n\n  stream._writer = undefined;\n  writer._ownerWritableStream = undefined!;\n}\n\nfunction WritableStreamDefaultWriterWrite<W>(writer: WritableStreamDefaultWriter<W>, chunk: W): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  const controller = stream._writableStreamController;\n\n  const chunkSize = WritableStreamDefaultControllerGetChunkSize(controller, chunk);\n\n  if (stream !== writer._ownerWritableStream) {\n    return promiseRejectedWith(defaultWriterLockException('write to'));\n  }\n\n  const state = stream._state;\n  if (state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n  if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {\n    return promiseRejectedWith(new TypeError('The stream is closing or closed and cannot be written to'));\n  }\n  if (state === 'erroring') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  assert(state === 'writable');\n\n  const promise = WritableStreamAddWriteRequest(stream);\n\n  WritableStreamDefaultControllerWrite(controller, chunk, chunkSize);\n\n  return promise;\n}\n\nconst closeSentinel: unique symbol = {} as any;\n\ntype QueueRecord<W> = W | typeof closeSentinel;\n\n/**\n * Allows control of a {@link WritableStream | writable stream}'s state and internal queue.\n *\n * @public\n */\nexport class WritableStreamDefaultController<W = any> {\n  /** @internal */\n  _controlledWritableStream!: WritableStream<W>;\n  /** @internal */\n  _queue!: SimpleQueue<QueuePair<QueueRecord<W>>>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _abortReason: any;\n  /** @internal */\n  _abortController: AbortController | undefined;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _strategySizeAlgorithm!: QueuingStrategySizeCallback<W>;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _writeAlgorithm!: (chunk: W) => Promise<void>;\n  /** @internal */\n  _closeAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _abortAlgorithm!: (reason: any) => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * The reason which was passed to `WritableStream.abort(reason)` when the stream was aborted.\n   *\n   * @deprecated\n   *  This property has been removed from the specification, see https://github.com/whatwg/streams/pull/1177.\n   *  Use {@link WritableStreamDefaultController.signal}'s `reason` instead.\n   */\n  get abortReason(): any {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('abortReason');\n    }\n    return this._abortReason;\n  }\n\n  /**\n   * An `AbortSignal` that can be used to abort the pending write or close operation when the stream is aborted.\n   */\n  get signal(): AbortSignal {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('signal');\n    }\n    if (this._abortController === undefined) {\n      // Older browsers or older Node versions may not support `AbortController` or `AbortSignal`.\n      // We don't want to bundle and ship an `AbortController` polyfill together with our polyfill,\n      // so instead we only implement support for `signal` if we find a global `AbortController` constructor.\n      throw new TypeError('WritableStreamDefaultController.prototype.signal is not supported');\n    }\n    return this._abortController.signal;\n  }\n\n  /**\n   * Closes the controlled writable stream, making all future interactions with it fail with the given error `e`.\n   *\n   * This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying\n   * sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the\n   * normal lifecycle of interactions with the underlying sink.\n   */\n  error(e: any = undefined): void {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n    const state = this._controlledWritableStream._state;\n    if (state !== 'writable') {\n      // The stream is closed, errored or will be soon. The sink can't do anything useful if it gets an error here, so\n      // just treat it as a no-op.\n      return;\n    }\n\n    WritableStreamDefaultControllerError(this, e);\n  }\n\n  /** @internal */\n  [AbortSteps](reason: any): Promise<void> {\n    const result = this._abortAlgorithm(reason);\n    WritableStreamDefaultControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [ErrorSteps]() {\n    ResetQueue(this);\n  }\n}\n\nObject.defineProperties(WritableStreamDefaultController.prototype, {\n  abortReason: { enumerable: true },\n  signal: { enumerable: true },\n  error: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'WritableStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Abstract operations implementing interface required by the WritableStream.\n\nfunction IsWritableStreamDefaultController(x: any): x is WritableStreamDefaultController<any> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledWritableStream')) {\n    return false;\n  }\n\n  return x instanceof WritableStreamDefaultController;\n}\n\nfunction SetUpWritableStreamDefaultController<W>(stream: WritableStream<W>,\n                                                 controller: WritableStreamDefaultController<W>,\n                                                 startAlgorithm: () => void | PromiseLike<void>,\n                                                 writeAlgorithm: (chunk: W) => Promise<void>,\n                                                 closeAlgorithm: () => Promise<void>,\n                                                 abortAlgorithm: (reason: any) => Promise<void>,\n                                                 highWaterMark: number,\n                                                 sizeAlgorithm: QueuingStrategySizeCallback<W>) {\n  assert(IsWritableStream(stream));\n  assert(stream._writableStreamController === undefined);\n\n  controller._controlledWritableStream = stream;\n  stream._writableStreamController = controller;\n\n  // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n  controller._queue = undefined!;\n  controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._abortReason = undefined;\n  controller._abortController = createAbortController();\n  controller._started = false;\n\n  controller._strategySizeAlgorithm = sizeAlgorithm;\n  controller._strategyHWM = highWaterMark;\n\n  controller._writeAlgorithm = writeAlgorithm;\n  controller._closeAlgorithm = closeAlgorithm;\n  controller._abortAlgorithm = abortAlgorithm;\n\n  const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n  WritableStreamUpdateBackpressure(stream, backpressure);\n\n  const startResult = startAlgorithm();\n  const startPromise = promiseResolvedWith(startResult);\n  uponPromise(\n    startPromise,\n    () => {\n      assert(stream._state === 'writable' || stream._state === 'erroring');\n      controller._started = true;\n      WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n    },\n    r => {\n      assert(stream._state === 'writable' || stream._state === 'erroring');\n      controller._started = true;\n      WritableStreamDealWithRejection(stream, r);\n    }\n  );\n}\n\nfunction SetUpWritableStreamDefaultControllerFromUnderlyingSink<W>(stream: WritableStream<W>,\n                                                                   underlyingSink: ValidatedUnderlyingSink<W>,\n                                                                   highWaterMark: number,\n                                                                   sizeAlgorithm: QueuingStrategySizeCallback<W>) {\n  const controller = Object.create(WritableStreamDefaultController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let writeAlgorithm: (chunk: W) => Promise<void> = () => promiseResolvedWith(undefined);\n  let closeAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let abortAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingSink.start !== undefined) {\n    startAlgorithm = () => underlyingSink.start!(controller);\n  }\n  if (underlyingSink.write !== undefined) {\n    writeAlgorithm = chunk => underlyingSink.write!(chunk, controller);\n  }\n  if (underlyingSink.close !== undefined) {\n    closeAlgorithm = () => underlyingSink.close!();\n  }\n  if (underlyingSink.abort !== undefined) {\n    abortAlgorithm = reason => underlyingSink.abort!(reason);\n  }\n\n  SetUpWritableStreamDefaultController(\n    stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm\n  );\n}\n\n// ClearAlgorithms may be called twice. Erroring the same stream in multiple ways will often result in redundant calls.\nfunction WritableStreamDefaultControllerClearAlgorithms(controller: WritableStreamDefaultController<any>) {\n  controller._writeAlgorithm = undefined!;\n  controller._closeAlgorithm = undefined!;\n  controller._abortAlgorithm = undefined!;\n  controller._strategySizeAlgorithm = undefined!;\n}\n\nfunction WritableStreamDefaultControllerClose<W>(controller: WritableStreamDefaultController<W>) {\n  EnqueueValueWithSize(controller, closeSentinel, 0);\n  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\nfunction WritableStreamDefaultControllerGetChunkSize<W>(controller: WritableStreamDefaultController<W>,\n                                                        chunk: W): number {\n  try {\n    return controller._strategySizeAlgorithm(chunk);\n  } catch (chunkSizeE) {\n    WritableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE);\n    return 1;\n  }\n}\n\nfunction WritableStreamDefaultControllerGetDesiredSize(controller: WritableStreamDefaultController<any>): number {\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\nfunction WritableStreamDefaultControllerWrite<W>(controller: WritableStreamDefaultController<W>,\n                                                 chunk: W,\n                                                 chunkSize: number) {\n  try {\n    EnqueueValueWithSize(controller, chunk, chunkSize);\n  } catch (enqueueE) {\n    WritableStreamDefaultControllerErrorIfNeeded(controller, enqueueE);\n    return;\n  }\n\n  const stream = controller._controlledWritableStream;\n  if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._state === 'writable') {\n    const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n    WritableStreamUpdateBackpressure(stream, backpressure);\n  }\n\n  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\n// Abstract operations for the WritableStreamDefaultController.\n\nfunction WritableStreamDefaultControllerAdvanceQueueIfNeeded<W>(controller: WritableStreamDefaultController<W>) {\n  const stream = controller._controlledWritableStream;\n\n  if (!controller._started) {\n    return;\n  }\n\n  if (stream._inFlightWriteRequest !== undefined) {\n    return;\n  }\n\n  const state = stream._state;\n  assert(state !== 'closed' && state !== 'errored');\n  if (state === 'erroring') {\n    WritableStreamFinishErroring(stream);\n    return;\n  }\n\n  if (controller._queue.length === 0) {\n    return;\n  }\n\n  const value = PeekQueueValue(controller);\n  if (value === closeSentinel) {\n    WritableStreamDefaultControllerProcessClose(controller);\n  } else {\n    WritableStreamDefaultControllerProcessWrite(controller, value);\n  }\n}\n\nfunction WritableStreamDefaultControllerErrorIfNeeded(controller: WritableStreamDefaultController<any>, error: any) {\n  if (controller._controlledWritableStream._state === 'writable') {\n    WritableStreamDefaultControllerError(controller, error);\n  }\n}\n\nfunction WritableStreamDefaultControllerProcessClose(controller: WritableStreamDefaultController<any>) {\n  const stream = controller._controlledWritableStream;\n\n  WritableStreamMarkCloseRequestInFlight(stream);\n\n  DequeueValue(controller);\n  assert(controller._queue.length === 0);\n\n  const sinkClosePromise = controller._closeAlgorithm();\n  WritableStreamDefaultControllerClearAlgorithms(controller);\n  uponPromise(\n    sinkClosePromise,\n    () => {\n      WritableStreamFinishInFlightClose(stream);\n    },\n    reason => {\n      WritableStreamFinishInFlightCloseWithError(stream, reason);\n    }\n  );\n}\n\nfunction WritableStreamDefaultControllerProcessWrite<W>(controller: WritableStreamDefaultController<W>, chunk: W) {\n  const stream = controller._controlledWritableStream;\n\n  WritableStreamMarkFirstWriteRequestInFlight(stream);\n\n  const sinkWritePromise = controller._writeAlgorithm(chunk);\n  uponPromise(\n    sinkWritePromise,\n    () => {\n      WritableStreamFinishInFlightWrite(stream);\n\n      const state = stream._state;\n      assert(state === 'writable' || state === 'erroring');\n\n      DequeueValue(controller);\n\n      if (!WritableStreamCloseQueuedOrInFlight(stream) && state === 'writable') {\n        const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n        WritableStreamUpdateBackpressure(stream, backpressure);\n      }\n\n      WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n    },\n    reason => {\n      if (stream._state === 'writable') {\n        WritableStreamDefaultControllerClearAlgorithms(controller);\n      }\n      WritableStreamFinishInFlightWriteWithError(stream, reason);\n    }\n  );\n}\n\nfunction WritableStreamDefaultControllerGetBackpressure(controller: WritableStreamDefaultController<any>): boolean {\n  const desiredSize = WritableStreamDefaultControllerGetDesiredSize(controller);\n  return desiredSize <= 0;\n}\n\n// A client of WritableStreamDefaultController may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultControllerError(controller: WritableStreamDefaultController<any>, error: any) {\n  const stream = controller._controlledWritableStream;\n\n  assert(stream._state === 'writable');\n\n  WritableStreamDefaultControllerClearAlgorithms(controller);\n  WritableStreamStartErroring(stream, error);\n}\n\n// Helper functions for the WritableStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(`WritableStream.prototype.${name} can only be used on a WritableStream`);\n}\n\n// Helper functions for the WritableStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `WritableStreamDefaultController.prototype.${name} can only be used on a WritableStreamDefaultController`);\n}\n\n\n// Helper functions for the WritableStreamDefaultWriter.\n\nfunction defaultWriterBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `WritableStreamDefaultWriter.prototype.${name} can only be used on a WritableStreamDefaultWriter`);\n}\n\nfunction defaultWriterLockException(name: string): TypeError {\n  return new TypeError('Cannot ' + name + ' a stream using a released writer');\n}\n\nfunction defaultWriterClosedPromiseInitialize(writer: WritableStreamDefaultWriter) {\n  writer._closedPromise = newPromise((resolve, reject) => {\n    writer._closedPromise_resolve = resolve;\n    writer._closedPromise_reject = reject;\n    writer._closedPromiseState = 'pending';\n  });\n}\n\nfunction defaultWriterClosedPromiseInitializeAsRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  defaultWriterClosedPromiseInitialize(writer);\n  defaultWriterClosedPromiseReject(writer, reason);\n}\n\nfunction defaultWriterClosedPromiseInitializeAsResolved(writer: WritableStreamDefaultWriter) {\n  defaultWriterClosedPromiseInitialize(writer);\n  defaultWriterClosedPromiseResolve(writer);\n}\n\nfunction defaultWriterClosedPromiseReject(writer: WritableStreamDefaultWriter, reason: any) {\n  if (writer._closedPromise_reject === undefined) {\n    return;\n  }\n  assert(writer._closedPromiseState === 'pending');\n\n  setPromiseIsHandledToTrue(writer._closedPromise);\n  writer._closedPromise_reject(reason);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'rejected';\n}\n\nfunction defaultWriterClosedPromiseResetToRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  assert(writer._closedPromise_resolve === undefined);\n  assert(writer._closedPromise_reject === undefined);\n  assert(writer._closedPromiseState !== 'pending');\n\n  defaultWriterClosedPromiseInitializeAsRejected(writer, reason);\n}\n\nfunction defaultWriterClosedPromiseResolve(writer: WritableStreamDefaultWriter) {\n  if (writer._closedPromise_resolve === undefined) {\n    return;\n  }\n  assert(writer._closedPromiseState === 'pending');\n\n  writer._closedPromise_resolve(undefined);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'resolved';\n}\n\nfunction defaultWriterReadyPromiseInitialize(writer: WritableStreamDefaultWriter) {\n  writer._readyPromise = newPromise((resolve, reject) => {\n    writer._readyPromise_resolve = resolve;\n    writer._readyPromise_reject = reject;\n  });\n  writer._readyPromiseState = 'pending';\n}\n\nfunction defaultWriterReadyPromiseInitializeAsRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  defaultWriterReadyPromiseInitialize(writer);\n  defaultWriterReadyPromiseReject(writer, reason);\n}\n\nfunction defaultWriterReadyPromiseInitializeAsResolved(writer: WritableStreamDefaultWriter) {\n  defaultWriterReadyPromiseInitialize(writer);\n  defaultWriterReadyPromiseResolve(writer);\n}\n\nfunction defaultWriterReadyPromiseReject(writer: WritableStreamDefaultWriter, reason: any) {\n  if (writer._readyPromise_reject === undefined) {\n    return;\n  }\n\n  setPromiseIsHandledToTrue(writer._readyPromise);\n  writer._readyPromise_reject(reason);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'rejected';\n}\n\nfunction defaultWriterReadyPromiseReset(writer: WritableStreamDefaultWriter) {\n  assert(writer._readyPromise_resolve === undefined);\n  assert(writer._readyPromise_reject === undefined);\n\n  defaultWriterReadyPromiseInitialize(writer);\n}\n\nfunction defaultWriterReadyPromiseResetToRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  assert(writer._readyPromise_resolve === undefined);\n  assert(writer._readyPromise_reject === undefined);\n\n  defaultWriterReadyPromiseInitializeAsRejected(writer, reason);\n}\n\nfunction defaultWriterReadyPromiseResolve(writer: WritableStreamDefaultWriter) {\n  if (writer._readyPromise_resolve === undefined) {\n    return;\n  }\n\n  writer._readyPromise_resolve(undefined);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'fulfilled';\n}\n","/// <reference lib=\"dom\" />\nexport const NativeDOMException: typeof DOMException | undefined =\n  typeof DOMException !== 'undefined' ? DOMException : undefined;\n","/// <reference types=\"node\" />\nimport { NativeDOMException } from './native';\n\ndeclare class DOMExceptionClass extends Error {\n  constructor(message?: string, name?: string);\n\n  name: string;\n  message: string;\n}\n\ntype DOMException = DOMExceptionClass;\ntype DOMExceptionConstructor = typeof DOMExceptionClass;\n\nfunction isDOMExceptionConstructor(ctor: unknown): ctor is DOMExceptionConstructor {\n  if (!(typeof ctor === 'function' || typeof ctor === 'object')) {\n    return false;\n  }\n  try {\n    new (ctor as DOMExceptionConstructor)();\n    return true;\n  } catch {\n    return false;\n  }\n}\n\nfunction createDOMExceptionPolyfill(): DOMExceptionConstructor {\n  // eslint-disable-next-line no-shadow\n  const ctor = function DOMException(this: DOMException, message?: string, name?: string) {\n    this.message = message || '';\n    this.name = name || 'Error';\n    if (Error.captureStackTrace) {\n      Error.captureStackTrace(this, this.constructor);\n    }\n  } as any;\n  ctor.prototype = Object.create(Error.prototype);\n  Object.defineProperty(ctor.prototype, 'constructor', { value: ctor, writable: true, configurable: true });\n  return ctor;\n}\n\n// eslint-disable-next-line no-redeclare\nconst DOMException: DOMExceptionConstructor =\n  isDOMExceptionConstructor(NativeDOMException) ? NativeDOMException : createDOMExceptionPolyfill();\n\nexport { DOMException };\n","import { IsReadableStream, IsReadableStreamLocked, ReadableStream, ReadableStreamCancel } from '../readable-stream';\nimport { AcquireReadableStreamDefaultReader, ReadableStreamDefaultReaderRead } from './default-reader';\nimport { ReadableStreamReaderGenericRelease } from './generic-reader';\nimport {\n  AcquireWritableStreamDefaultWriter,\n  IsWritableStream,\n  IsWritableStreamLocked,\n  WritableStream,\n  WritableStreamAbort,\n  WritableStreamCloseQueuedOrInFlight,\n  WritableStreamDefaultWriterCloseWithErrorPropagation,\n  WritableStreamDefaultWriterRelease,\n  WritableStreamDefaultWriterWrite\n} from '../writable-stream';\nimport assert from '../../stub/assert';\nimport {\n  newPromise,\n  PerformPromiseThen,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  uponFulfillment,\n  uponPromise,\n  uponRejection\n} from '../helpers/webidl';\nimport { noop } from '../../utils';\nimport { AbortSignal, isAbortSignal } from '../abort-signal';\nimport { DOMException } from '../../stub/dom-exception';\n\nexport function ReadableStreamPipeTo<T>(source: ReadableStream<T>,\n                                        dest: WritableStream<T>,\n                                        preventClose: boolean,\n                                        preventAbort: boolean,\n                                        preventCancel: boolean,\n                                        signal: AbortSignal | undefined): Promise<undefined> {\n  assert(IsReadableStream(source));\n  assert(IsWritableStream(dest));\n  assert(typeof preventClose === 'boolean');\n  assert(typeof preventAbort === 'boolean');\n  assert(typeof preventCancel === 'boolean');\n  assert(signal === undefined || isAbortSignal(signal));\n  assert(!IsReadableStreamLocked(source));\n  assert(!IsWritableStreamLocked(dest));\n\n  const reader = AcquireReadableStreamDefaultReader<T>(source);\n  const writer = AcquireWritableStreamDefaultWriter<T>(dest);\n\n  source._disturbed = true;\n\n  let shuttingDown = false;\n\n  // This is used to keep track of the spec's requirement that we wait for ongoing writes during shutdown.\n  let currentWrite = promiseResolvedWith<void>(undefined);\n\n  return newPromise((resolve, reject) => {\n    let abortAlgorithm: () => void;\n    if (signal !== undefined) {\n      abortAlgorithm = () => {\n        const error = new DOMException('Aborted', 'AbortError');\n        const actions: Array<() => Promise<void>> = [];\n        if (!preventAbort) {\n          actions.push(() => {\n            if (dest._state === 'writable') {\n              return WritableStreamAbort(dest, error);\n            }\n            return promiseResolvedWith(undefined);\n          });\n        }\n        if (!preventCancel) {\n          actions.push(() => {\n            if (source._state === 'readable') {\n              return ReadableStreamCancel(source, error);\n            }\n            return promiseResolvedWith(undefined);\n          });\n        }\n        shutdownWithAction(() => Promise.all(actions.map(action => action())), true, error);\n      };\n\n      if (signal.aborted) {\n        abortAlgorithm();\n        return;\n      }\n\n      signal.addEventListener('abort', abortAlgorithm);\n    }\n\n    // Using reader and writer, read all chunks from this and write them to dest\n    // - Backpressure must be enforced\n    // - Shutdown must stop all activity\n    function pipeLoop() {\n      return newPromise<void>((resolveLoop, rejectLoop) => {\n        function next(done: boolean) {\n          if (done) {\n            resolveLoop();\n          } else {\n            // Use `PerformPromiseThen` instead of `uponPromise` to avoid\n            // adding unnecessary `.catch(rethrowAssertionErrorRejection)` handlers\n            PerformPromiseThen(pipeStep(), next, rejectLoop);\n          }\n        }\n\n        next(false);\n      });\n    }\n\n    function pipeStep(): Promise<boolean> {\n      if (shuttingDown) {\n        return promiseResolvedWith(true);\n      }\n\n      return PerformPromiseThen(writer._readyPromise, () => {\n        return newPromise<boolean>((resolveRead, rejectRead) => {\n          ReadableStreamDefaultReaderRead(\n            reader,\n            {\n              _chunkSteps: chunk => {\n                currentWrite = PerformPromiseThen(WritableStreamDefaultWriterWrite(writer, chunk), undefined, noop);\n                resolveRead(false);\n              },\n              _closeSteps: () => resolveRead(true),\n              _errorSteps: rejectRead\n            }\n          );\n        });\n      });\n    }\n\n    // Errors must be propagated forward\n    isOrBecomesErrored(source, reader._closedPromise, storedError => {\n      if (!preventAbort) {\n        shutdownWithAction(() => WritableStreamAbort(dest, storedError), true, storedError);\n      } else {\n        shutdown(true, storedError);\n      }\n    });\n\n    // Errors must be propagated backward\n    isOrBecomesErrored(dest, writer._closedPromise, storedError => {\n      if (!preventCancel) {\n        shutdownWithAction(() => ReadableStreamCancel(source, storedError), true, storedError);\n      } else {\n        shutdown(true, storedError);\n      }\n    });\n\n    // Closing must be propagated forward\n    isOrBecomesClosed(source, reader._closedPromise, () => {\n      if (!preventClose) {\n        shutdownWithAction(() => WritableStreamDefaultWriterCloseWithErrorPropagation(writer));\n      } else {\n        shutdown();\n      }\n    });\n\n    // Closing must be propagated backward\n    if (WritableStreamCloseQueuedOrInFlight(dest) || dest._state === 'closed') {\n      const destClosed = new TypeError('the destination writable stream closed before all data could be piped to it');\n\n      if (!preventCancel) {\n        shutdownWithAction(() => ReadableStreamCancel(source, destClosed), true, destClosed);\n      } else {\n        shutdown(true, destClosed);\n      }\n    }\n\n    setPromiseIsHandledToTrue(pipeLoop());\n\n    function waitForWritesToFinish(): Promise<void> {\n      // Another write may have started while we were waiting on this currentWrite, so we have to be sure to wait\n      // for that too.\n      const oldCurrentWrite = currentWrite;\n      return PerformPromiseThen(\n        currentWrite,\n        () => oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined\n      );\n    }\n\n    function isOrBecomesErrored(stream: ReadableStream | WritableStream,\n                                promise: Promise<void>,\n                                action: (reason: any) => void) {\n      if (stream._state === 'errored') {\n        action(stream._storedError);\n      } else {\n        uponRejection(promise, action);\n      }\n    }\n\n    function isOrBecomesClosed(stream: ReadableStream | WritableStream, promise: Promise<void>, action: () => void) {\n      if (stream._state === 'closed') {\n        action();\n      } else {\n        uponFulfillment(promise, action);\n      }\n    }\n\n    function shutdownWithAction(action: () => Promise<unknown>, originalIsError?: boolean, originalError?: any) {\n      if (shuttingDown) {\n        return;\n      }\n      shuttingDown = true;\n\n      if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {\n        uponFulfillment(waitForWritesToFinish(), doTheRest);\n      } else {\n        doTheRest();\n      }\n\n      function doTheRest() {\n        uponPromise(\n          action(),\n          () => finalize(originalIsError, originalError),\n          newError => finalize(true, newError)\n        );\n      }\n    }\n\n    function shutdown(isError?: boolean, error?: any) {\n      if (shuttingDown) {\n        return;\n      }\n      shuttingDown = true;\n\n      if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {\n        uponFulfillment(waitForWritesToFinish(), () => finalize(isError, error));\n      } else {\n        finalize(isError, error);\n      }\n    }\n\n    function finalize(isError?: boolean, error?: any) {\n      WritableStreamDefaultWriterRelease(writer);\n      ReadableStreamReaderGenericRelease(reader);\n\n      if (signal !== undefined) {\n        signal.removeEventListener('abort', abortAlgorithm);\n      }\n      if (isError) {\n        reject(error);\n      } else {\n        resolve(undefined);\n      }\n    }\n  });\n}\n","import { QueuingStrategySizeCallback } from '../queuing-strategy';\nimport assert from '../../stub/assert';\nimport { DequeueValue, EnqueueValueWithSize, QueuePair, ResetQueue } from '../abstract-ops/queue-with-sizes';\nimport {\n  ReadableStreamAddReadRequest,\n  ReadableStreamFulfillReadRequest,\n  ReadableStreamGetNumReadRequests,\n  ReadRequest\n} from './default-reader';\nimport { SimpleQueue } from '../simple-queue';\nimport { IsReadableStreamLocked, ReadableStream, ReadableStreamClose, ReadableStreamError } from '../readable-stream';\nimport { ValidatedUnderlyingSource } from './underlying-source';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { CancelSteps, PullSteps } from '../abstract-ops/internal-methods';\nimport { promiseResolvedWith, uponPromise } from '../helpers/webidl';\n\n/**\n * Allows control of a {@link ReadableStream | readable stream}'s state and internal queue.\n *\n * @public\n */\nexport class ReadableStreamDefaultController<R> {\n  /** @internal */\n  _controlledReadableStream!: ReadableStream<R>;\n  /** @internal */\n  _queue!: SimpleQueue<QueuePair<R>>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _closeRequested!: boolean;\n  /** @internal */\n  _pullAgain!: boolean;\n  /** @internal */\n  _pulling !: boolean;\n  /** @internal */\n  _strategySizeAlgorithm!: QueuingStrategySizeCallback<R>;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _pullAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _cancelAlgorithm!: (reason: any) => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is\n   * over-full. An underlying source ought to use this information to determine when and how to apply backpressure.\n   */\n  get desiredSize(): number | null {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('desiredSize');\n    }\n\n    return ReadableStreamDefaultControllerGetDesiredSize(this);\n  }\n\n  /**\n   * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from\n   * the stream, but once those are read, the stream will become closed.\n   */\n  close(): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('close');\n    }\n\n    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {\n      throw new TypeError('The stream is not in a state that permits close');\n    }\n\n    ReadableStreamDefaultControllerClose(this);\n  }\n\n  /**\n   * Enqueues the given chunk `chunk` in the controlled readable stream.\n   */\n  enqueue(chunk: R): void;\n  enqueue(chunk: R = undefined!): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('enqueue');\n    }\n\n    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {\n      throw new TypeError('The stream is not in a state that permits enqueue');\n    }\n\n    return ReadableStreamDefaultControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.\n   */\n  error(e: any = undefined): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n\n    ReadableStreamDefaultControllerError(this, e);\n  }\n\n  /** @internal */\n  [CancelSteps](reason: any): Promise<void> {\n    ResetQueue(this);\n    const result = this._cancelAlgorithm(reason);\n    ReadableStreamDefaultControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [PullSteps](readRequest: ReadRequest<R>): void {\n    const stream = this._controlledReadableStream;\n\n    if (this._queue.length > 0) {\n      const chunk = DequeueValue(this);\n\n      if (this._closeRequested && this._queue.length === 0) {\n        ReadableStreamDefaultControllerClearAlgorithms(this);\n        ReadableStreamClose(stream);\n      } else {\n        ReadableStreamDefaultControllerCallPullIfNeeded(this);\n      }\n\n      readRequest._chunkSteps(chunk);\n    } else {\n      ReadableStreamAddReadRequest(stream, readRequest);\n      ReadableStreamDefaultControllerCallPullIfNeeded(this);\n    }\n  }\n}\n\nObject.defineProperties(ReadableStreamDefaultController.prototype, {\n  close: { enumerable: true },\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Abstract operations for the ReadableStreamDefaultController.\n\nfunction IsReadableStreamDefaultController<R = any>(x: any): x is ReadableStreamDefaultController<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableStream')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamDefaultController;\n}\n\nfunction ReadableStreamDefaultControllerCallPullIfNeeded(controller: ReadableStreamDefaultController<any>): void {\n  const shouldPull = ReadableStreamDefaultControllerShouldCallPull(controller);\n  if (!shouldPull) {\n    return;\n  }\n\n  if (controller._pulling) {\n    controller._pullAgain = true;\n    return;\n  }\n\n  assert(!controller._pullAgain);\n\n  controller._pulling = true;\n\n  const pullPromise = controller._pullAlgorithm();\n  uponPromise(\n    pullPromise,\n    () => {\n      controller._pulling = false;\n\n      if (controller._pullAgain) {\n        controller._pullAgain = false;\n        ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n      }\n    },\n    e => {\n      ReadableStreamDefaultControllerError(controller, e);\n    }\n  );\n}\n\nfunction ReadableStreamDefaultControllerShouldCallPull(controller: ReadableStreamDefaultController<any>): boolean {\n  const stream = controller._controlledReadableStream;\n\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return false;\n  }\n\n  if (!controller._started) {\n    return false;\n  }\n\n  if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    return true;\n  }\n\n  const desiredSize = ReadableStreamDefaultControllerGetDesiredSize(controller);\n  assert(desiredSize !== null);\n  if (desiredSize! > 0) {\n    return true;\n  }\n\n  return false;\n}\n\nfunction ReadableStreamDefaultControllerClearAlgorithms(controller: ReadableStreamDefaultController<any>) {\n  controller._pullAlgorithm = undefined!;\n  controller._cancelAlgorithm = undefined!;\n  controller._strategySizeAlgorithm = undefined!;\n}\n\n// A client of ReadableStreamDefaultController may use these functions directly to bypass state check.\n\nexport function ReadableStreamDefaultControllerClose(controller: ReadableStreamDefaultController<any>) {\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return;\n  }\n\n  const stream = controller._controlledReadableStream;\n\n  controller._closeRequested = true;\n\n  if (controller._queue.length === 0) {\n    ReadableStreamDefaultControllerClearAlgorithms(controller);\n    ReadableStreamClose(stream);\n  }\n}\n\nexport function ReadableStreamDefaultControllerEnqueue<R>(\n  controller: ReadableStreamDefaultController<R>,\n  chunk: R\n): void {\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return;\n  }\n\n  const stream = controller._controlledReadableStream;\n\n  if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    ReadableStreamFulfillReadRequest(stream, chunk, false);\n  } else {\n    let chunkSize;\n    try {\n      chunkSize = controller._strategySizeAlgorithm(chunk);\n    } catch (chunkSizeE) {\n      ReadableStreamDefaultControllerError(controller, chunkSizeE);\n      throw chunkSizeE;\n    }\n\n    try {\n      EnqueueValueWithSize(controller, chunk, chunkSize);\n    } catch (enqueueE) {\n      ReadableStreamDefaultControllerError(controller, enqueueE);\n      throw enqueueE;\n    }\n  }\n\n  ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n}\n\nexport function ReadableStreamDefaultControllerError(controller: ReadableStreamDefaultController<any>, e: any) {\n  const stream = controller._controlledReadableStream;\n\n  if (stream._state !== 'readable') {\n    return;\n  }\n\n  ResetQueue(controller);\n\n  ReadableStreamDefaultControllerClearAlgorithms(controller);\n  ReadableStreamError(stream, e);\n}\n\nexport function ReadableStreamDefaultControllerGetDesiredSize(\n  controller: ReadableStreamDefaultController<any>\n): number | null {\n  const state = controller._controlledReadableStream._state;\n\n  if (state === 'errored') {\n    return null;\n  }\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\n// This is used in the implementation of TransformStream.\nexport function ReadableStreamDefaultControllerHasBackpressure(\n  controller: ReadableStreamDefaultController<any>\n): boolean {\n  if (ReadableStreamDefaultControllerShouldCallPull(controller)) {\n    return false;\n  }\n\n  return true;\n}\n\nexport function ReadableStreamDefaultControllerCanCloseOrEnqueue(\n  controller: ReadableStreamDefaultController<any>\n): boolean {\n  const state = controller._controlledReadableStream._state;\n\n  if (!controller._closeRequested && state === 'readable') {\n    return true;\n  }\n\n  return false;\n}\n\nexport function SetUpReadableStreamDefaultController<R>(stream: ReadableStream<R>,\n                                                        controller: ReadableStreamDefaultController<R>,\n                                                        startAlgorithm: () => void | PromiseLike<void>,\n                                                        pullAlgorithm: () => Promise<void>,\n                                                        cancelAlgorithm: (reason: any) => Promise<void>,\n                                                        highWaterMark: number,\n                                                        sizeAlgorithm: QueuingStrategySizeCallback<R>) {\n  assert(stream._readableStreamController === undefined);\n\n  controller._controlledReadableStream = stream;\n\n  controller._queue = undefined!;\n  controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._started = false;\n  controller._closeRequested = false;\n  controller._pullAgain = false;\n  controller._pulling = false;\n\n  controller._strategySizeAlgorithm = sizeAlgorithm;\n  controller._strategyHWM = highWaterMark;\n\n  controller._pullAlgorithm = pullAlgorithm;\n  controller._cancelAlgorithm = cancelAlgorithm;\n\n  stream._readableStreamController = controller;\n\n  const startResult = startAlgorithm();\n  uponPromise(\n    promiseResolvedWith(startResult),\n    () => {\n      controller._started = true;\n\n      assert(!controller._pulling);\n      assert(!controller._pullAgain);\n\n      ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n    },\n    r => {\n      ReadableStreamDefaultControllerError(controller, r);\n    }\n  );\n}\n\nexport function SetUpReadableStreamDefaultControllerFromUnderlyingSource<R>(\n  stream: ReadableStream<R>,\n  underlyingSource: ValidatedUnderlyingSource<R>,\n  highWaterMark: number,\n  sizeAlgorithm: QueuingStrategySizeCallback<R>\n) {\n  const controller: ReadableStreamDefaultController<R> = Object.create(ReadableStreamDefaultController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let pullAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let cancelAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingSource.start !== undefined) {\n    startAlgorithm = () => underlyingSource.start!(controller);\n  }\n  if (underlyingSource.pull !== undefined) {\n    pullAlgorithm = () => underlyingSource.pull!(controller);\n  }\n  if (underlyingSource.cancel !== undefined) {\n    cancelAlgorithm = reason => underlyingSource.cancel!(reason);\n  }\n\n  SetUpReadableStreamDefaultController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm\n  );\n}\n\n// Helper functions for the ReadableStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamDefaultController.prototype.${name} can only be used on a ReadableStreamDefaultController`);\n}\n","import {\n  CreateReadableByteStream,\n  CreateReadableStream,\n  IsReadableStream,\n  ReadableByteStream,\n  ReadableStream,\n  ReadableStreamCancel,\n  ReadableStreamReader\n} from '../readable-stream';\nimport { ReadableStreamReaderGenericRelease } from './generic-reader';\nimport {\n  AcquireReadableStreamDefaultReader,\n  IsReadableStreamDefaultReader,\n  ReadableStreamDefaultReaderRead,\n  ReadRequest\n} from './default-reader';\nimport {\n  AcquireReadableStreamBYOBReader,\n  IsReadableStreamBYOBReader,\n  ReadableStreamBYOBReaderRead,\n  ReadIntoRequest\n} from './byob-reader';\nimport assert from '../../stub/assert';\nimport { newPromise, promiseResolvedWith, queueMicrotask, uponRejection } from '../helpers/webidl';\nimport {\n  ReadableStreamDefaultController,\n  ReadableStreamDefaultControllerClose,\n  ReadableStreamDefaultControllerEnqueue,\n  ReadableStreamDefaultControllerError\n} from './default-controller';\nimport {\n  IsReadableByteStreamController,\n  ReadableByteStreamControllerClose,\n  ReadableByteStreamControllerEnqueue,\n  ReadableByteStreamControllerError,\n  ReadableByteStreamControllerGetBYOBRequest,\n  ReadableByteStreamControllerRespond,\n  ReadableByteStreamControllerRespondWithNewView\n} from './byte-stream-controller';\nimport { CreateArrayFromList } from '../abstract-ops/ecmascript';\nimport { CloneAsUint8Array } from '../abstract-ops/miscellaneous';\n\nexport function ReadableStreamTee<R>(stream: ReadableStream<R>,\n                                     cloneForBranch2: boolean): [ReadableStream<R>, ReadableStream<R>] {\n  assert(IsReadableStream(stream));\n  assert(typeof cloneForBranch2 === 'boolean');\n  if (IsReadableByteStreamController(stream._readableStreamController)) {\n    return ReadableByteStreamTee(stream as unknown as ReadableByteStream) as\n      unknown as [ReadableStream<R>, ReadableStream<R>];\n  }\n  return ReadableStreamDefaultTee(stream, cloneForBranch2);\n}\n\nexport function ReadableStreamDefaultTee<R>(stream: ReadableStream<R>,\n                                            cloneForBranch2: boolean): [ReadableStream<R>, ReadableStream<R>] {\n  assert(IsReadableStream(stream));\n  assert(typeof cloneForBranch2 === 'boolean');\n\n  const reader = AcquireReadableStreamDefaultReader<R>(stream);\n\n  let reading = false;\n  let readAgain = false;\n  let canceled1 = false;\n  let canceled2 = false;\n  let reason1: any;\n  let reason2: any;\n  let branch1: ReadableStream<R>;\n  let branch2: ReadableStream<R>;\n\n  let resolveCancelPromise: (value: undefined | Promise<undefined>) => void;\n  const cancelPromise = newPromise<undefined>(resolve => {\n    resolveCancelPromise = resolve;\n  });\n\n  function pullAlgorithm(): Promise<void> {\n    if (reading) {\n      readAgain = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgain = false;\n          const chunk1 = chunk;\n          const chunk2 = chunk;\n\n          // There is no way to access the cloning code right now in the reference implementation.\n          // If we add one then we'll need an implementation for serializable objects.\n          // if (!canceled2 && cloneForBranch2) {\n          //   chunk2 = StructuredDeserialize(StructuredSerialize(chunk2));\n          // }\n\n          if (!canceled1) {\n            ReadableStreamDefaultControllerEnqueue(\n              branch1._readableStreamController as ReadableStreamDefaultController<R>,\n              chunk1\n            );\n          }\n          if (!canceled2) {\n            ReadableStreamDefaultControllerEnqueue(\n              branch2._readableStreamController as ReadableStreamDefaultController<R>,\n              chunk2\n            );\n          }\n\n          reading = false;\n          if (readAgain) {\n            pullAlgorithm();\n          }\n        });\n      },\n      _closeSteps: () => {\n        reading = false;\n        if (!canceled1) {\n          ReadableStreamDefaultControllerClose(branch1._readableStreamController as ReadableStreamDefaultController<R>);\n        }\n        if (!canceled2) {\n          ReadableStreamDefaultControllerClose(branch2._readableStreamController as ReadableStreamDefaultController<R>);\n        }\n\n        if (!canceled1 || !canceled2) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function cancel1Algorithm(reason: any): Promise<void> {\n    canceled1 = true;\n    reason1 = reason;\n    if (canceled2) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function cancel2Algorithm(reason: any): Promise<void> {\n    canceled2 = true;\n    reason2 = reason;\n    if (canceled1) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function startAlgorithm() {\n    // do nothing\n  }\n\n  branch1 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel1Algorithm);\n  branch2 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel2Algorithm);\n\n  uponRejection(reader._closedPromise, (r: any) => {\n    ReadableStreamDefaultControllerError(branch1._readableStreamController as ReadableStreamDefaultController<R>, r);\n    ReadableStreamDefaultControllerError(branch2._readableStreamController as ReadableStreamDefaultController<R>, r);\n    if (!canceled1 || !canceled2) {\n      resolveCancelPromise(undefined);\n    }\n  });\n\n  return [branch1, branch2];\n}\n\nexport function ReadableByteStreamTee(stream: ReadableByteStream): [ReadableByteStream, ReadableByteStream] {\n  assert(IsReadableStream(stream));\n  assert(IsReadableByteStreamController(stream._readableStreamController));\n\n  let reader: ReadableStreamReader<Uint8Array> = AcquireReadableStreamDefaultReader(stream);\n  let reading = false;\n  let readAgainForBranch1 = false;\n  let readAgainForBranch2 = false;\n  let canceled1 = false;\n  let canceled2 = false;\n  let reason1: any;\n  let reason2: any;\n  let branch1: ReadableByteStream;\n  let branch2: ReadableByteStream;\n\n  let resolveCancelPromise: (value: undefined | Promise<undefined>) => void;\n  const cancelPromise = newPromise<void>(resolve => {\n    resolveCancelPromise = resolve;\n  });\n\n  function forwardReaderError(thisReader: ReadableStreamReader<Uint8Array>) {\n    uponRejection(thisReader._closedPromise, r => {\n      if (thisReader !== reader) {\n        return;\n      }\n      ReadableByteStreamControllerError(branch1._readableStreamController, r);\n      ReadableByteStreamControllerError(branch2._readableStreamController, r);\n      if (!canceled1 || !canceled2) {\n        resolveCancelPromise(undefined);\n      }\n    });\n  }\n\n  function pullWithDefaultReader() {\n    if (IsReadableStreamBYOBReader(reader)) {\n      assert(reader._readIntoRequests.length === 0);\n      ReadableStreamReaderGenericRelease(reader);\n\n      reader = AcquireReadableStreamDefaultReader(stream);\n      forwardReaderError(reader);\n    }\n\n    const readRequest: ReadRequest<Uint8Array> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgainForBranch1 = false;\n          readAgainForBranch2 = false;\n\n          const chunk1 = chunk;\n          let chunk2 = chunk;\n          if (!canceled1 && !canceled2) {\n            try {\n              chunk2 = CloneAsUint8Array(chunk);\n            } catch (cloneE) {\n              ReadableByteStreamControllerError(branch1._readableStreamController, cloneE);\n              ReadableByteStreamControllerError(branch2._readableStreamController, cloneE);\n              resolveCancelPromise(ReadableStreamCancel(stream, cloneE));\n              return;\n            }\n          }\n\n          if (!canceled1) {\n            ReadableByteStreamControllerEnqueue(branch1._readableStreamController, chunk1);\n          }\n          if (!canceled2) {\n            ReadableByteStreamControllerEnqueue(branch2._readableStreamController, chunk2);\n          }\n\n          reading = false;\n          if (readAgainForBranch1) {\n            pull1Algorithm();\n          } else if (readAgainForBranch2) {\n            pull2Algorithm();\n          }\n        });\n      },\n      _closeSteps: () => {\n        reading = false;\n        if (!canceled1) {\n          ReadableByteStreamControllerClose(branch1._readableStreamController);\n        }\n        if (!canceled2) {\n          ReadableByteStreamControllerClose(branch2._readableStreamController);\n        }\n        if (branch1._readableStreamController._pendingPullIntos.length > 0) {\n          ReadableByteStreamControllerRespond(branch1._readableStreamController, 0);\n        }\n        if (branch2._readableStreamController._pendingPullIntos.length > 0) {\n          ReadableByteStreamControllerRespond(branch2._readableStreamController, 0);\n        }\n        if (!canceled1 || !canceled2) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n  }\n\n  function pullWithBYOBReader(view: ArrayBufferView, forBranch2: boolean) {\n    if (IsReadableStreamDefaultReader<Uint8Array>(reader)) {\n      assert(reader._readRequests.length === 0);\n      ReadableStreamReaderGenericRelease(reader);\n\n      reader = AcquireReadableStreamBYOBReader(stream);\n      forwardReaderError(reader);\n    }\n\n    const byobBranch = forBranch2 ? branch2 : branch1;\n    const otherBranch = forBranch2 ? branch1 : branch2;\n\n    const readIntoRequest: ReadIntoRequest<ArrayBufferView> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgainForBranch1 = false;\n          readAgainForBranch2 = false;\n\n          const byobCanceled = forBranch2 ? canceled2 : canceled1;\n          const otherCanceled = forBranch2 ? canceled1 : canceled2;\n\n          if (!otherCanceled) {\n            let clonedChunk;\n            try {\n              clonedChunk = CloneAsUint8Array(chunk);\n            } catch (cloneE) {\n              ReadableByteStreamControllerError(byobBranch._readableStreamController, cloneE);\n              ReadableByteStreamControllerError(otherBranch._readableStreamController, cloneE);\n              resolveCancelPromise(ReadableStreamCancel(stream, cloneE));\n              return;\n            }\n            if (!byobCanceled) {\n              ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n            }\n            ReadableByteStreamControllerEnqueue(otherBranch._readableStreamController, clonedChunk);\n          } else if (!byobCanceled) {\n            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n          }\n\n          reading = false;\n          if (readAgainForBranch1) {\n            pull1Algorithm();\n          } else if (readAgainForBranch2) {\n            pull2Algorithm();\n          }\n        });\n      },\n      _closeSteps: chunk => {\n        reading = false;\n\n        const byobCanceled = forBranch2 ? canceled2 : canceled1;\n        const otherCanceled = forBranch2 ? canceled1 : canceled2;\n\n        if (!byobCanceled) {\n          ReadableByteStreamControllerClose(byobBranch._readableStreamController);\n        }\n        if (!otherCanceled) {\n          ReadableByteStreamControllerClose(otherBranch._readableStreamController);\n        }\n\n        if (chunk !== undefined) {\n          assert(chunk.byteLength === 0);\n\n          if (!byobCanceled) {\n            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n          }\n          if (!otherCanceled && otherBranch._readableStreamController._pendingPullIntos.length > 0) {\n            ReadableByteStreamControllerRespond(otherBranch._readableStreamController, 0);\n          }\n        }\n\n        if (!byobCanceled || !otherCanceled) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamBYOBReaderRead(reader, view, readIntoRequest);\n  }\n\n  function pull1Algorithm(): Promise<void> {\n    if (reading) {\n      readAgainForBranch1 = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch1._readableStreamController);\n    if (byobRequest === null) {\n      pullWithDefaultReader();\n    } else {\n      pullWithBYOBReader(byobRequest._view!, false);\n    }\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function pull2Algorithm(): Promise<void> {\n    if (reading) {\n      readAgainForBranch2 = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch2._readableStreamController);\n    if (byobRequest === null) {\n      pullWithDefaultReader();\n    } else {\n      pullWithBYOBReader(byobRequest._view!, true);\n    }\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function cancel1Algorithm(reason: any): Promise<void> {\n    canceled1 = true;\n    reason1 = reason;\n    if (canceled2) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function cancel2Algorithm(reason: any): Promise<void> {\n    canceled2 = true;\n    reason2 = reason;\n    if (canceled1) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function startAlgorithm(): void {\n    return;\n  }\n\n  branch1 = CreateReadableByteStream(startAlgorithm, pull1Algorithm, cancel1Algorithm);\n  branch2 = CreateReadableByteStream(startAlgorithm, pull2Algorithm, cancel2Algorithm);\n\n  forwardReaderError(reader);\n\n  return [branch1, branch2];\n}\n","import { assertDictionary, assertFunction, convertUnsignedLongLongWithEnforceRange } from './basic';\nimport {\n  ReadableStreamController,\n  UnderlyingByteSource,\n  UnderlyingDefaultOrByteSource,\n  UnderlyingDefaultOrByteSourcePullCallback,\n  UnderlyingDefaultOrByteSourceStartCallback,\n  UnderlyingSource,\n  UnderlyingSourceCancelCallback,\n  ValidatedUnderlyingDefaultOrByteSource\n} from '../readable-stream/underlying-source';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\n\nexport function convertUnderlyingDefaultOrByteSource<R>(\n  source: UnderlyingSource<R> | UnderlyingByteSource | null,\n  context: string\n): ValidatedUnderlyingDefaultOrByteSource<R> {\n  assertDictionary(source, context);\n  const original = source as (UnderlyingDefaultOrByteSource<R> | null);\n  const autoAllocateChunkSize = original?.autoAllocateChunkSize;\n  const cancel = original?.cancel;\n  const pull = original?.pull;\n  const start = original?.start;\n  const type = original?.type;\n  return {\n    autoAllocateChunkSize: autoAllocateChunkSize === undefined ?\n      undefined :\n      convertUnsignedLongLongWithEnforceRange(\n        autoAllocateChunkSize,\n        `${context} has member 'autoAllocateChunkSize' that`\n      ),\n    cancel: cancel === undefined ?\n      undefined :\n      convertUnderlyingSourceCancelCallback(cancel, original!, `${context} has member 'cancel' that`),\n    pull: pull === undefined ?\n      undefined :\n      convertUnderlyingSourcePullCallback(pull, original!, `${context} has member 'pull' that`),\n    start: start === undefined ?\n      undefined :\n      convertUnderlyingSourceStartCallback(start, original!, `${context} has member 'start' that`),\n    type: type === undefined ? undefined : convertReadableStreamType(type, `${context} has member 'type' that`)\n  };\n}\n\nfunction convertUnderlyingSourceCancelCallback(\n  fn: UnderlyingSourceCancelCallback,\n  original: UnderlyingDefaultOrByteSource,\n  context: string\n): (reason: any) => Promise<void> {\n  assertFunction(fn, context);\n  return (reason: any) => promiseCall(fn, original, [reason]);\n}\n\nfunction convertUnderlyingSourcePullCallback<R>(\n  fn: UnderlyingDefaultOrByteSourcePullCallback<R>,\n  original: UnderlyingDefaultOrByteSource<R>,\n  context: string\n): (controller: ReadableStreamController<R>) => Promise<void> {\n  assertFunction(fn, context);\n  return (controller: ReadableStreamController<R>) => promiseCall(fn, original, [controller]);\n}\n\nfunction convertUnderlyingSourceStartCallback<R>(\n  fn: UnderlyingDefaultOrByteSourceStartCallback<R>,\n  original: UnderlyingDefaultOrByteSource<R>,\n  context: string\n): UnderlyingDefaultOrByteSourceStartCallback<R> {\n  assertFunction(fn, context);\n  return (controller: ReadableStreamController<R>) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertReadableStreamType(type: string, context: string): 'bytes' {\n  type = `${type}`;\n  if (type !== 'bytes') {\n    throw new TypeError(`${context} '${type}' is not a valid enumeration value for ReadableStreamType`);\n  }\n  return type;\n}\n","import { assertDictionary } from './basic';\nimport { ReadableStreamGetReaderOptions } from '../readable-stream/reader-options';\n\nexport function convertReaderOptions(options: ReadableStreamGetReaderOptions | null | undefined,\n                                     context: string): ReadableStreamGetReaderOptions {\n  assertDictionary(options, context);\n  const mode = options?.mode;\n  return {\n    mode: mode === undefined ? undefined : convertReadableStreamReaderMode(mode, `${context} has member 'mode' that`)\n  };\n}\n\nfunction convertReadableStreamReaderMode(mode: string, context: string): 'byob' {\n  mode = `${mode}`;\n  if (mode !== 'byob') {\n    throw new TypeError(`${context} '${mode}' is not a valid enumeration value for ReadableStreamReaderMode`);\n  }\n  return mode;\n}\n","import { assertDictionary } from './basic';\nimport { StreamPipeOptions, ValidatedStreamPipeOptions } from '../readable-stream/pipe-options';\nimport { AbortSignal, isAbortSignal } from '../abort-signal';\n\nexport function convertPipeOptions(options: StreamPipeOptions | null | undefined,\n                                   context: string): ValidatedStreamPipeOptions {\n  assertDictionary(options, context);\n  const preventAbort = options?.preventAbort;\n  const preventCancel = options?.preventCancel;\n  const preventClose = options?.preventClose;\n  const signal = options?.signal;\n  if (signal !== undefined) {\n    assertAbortSignal(signal, `${context} has member 'signal' that`);\n  }\n  return {\n    preventAbort: Boolean(preventAbort),\n    preventCancel: Boolean(preventCancel),\n    preventClose: Boolean(preventClose),\n    signal\n  };\n}\n\nfunction assertAbortSignal(signal: unknown, context: string): asserts signal is AbortSignal {\n  if (!isAbortSignal(signal)) {\n    throw new TypeError(`${context} is not an AbortSignal.`);\n  }\n}\n","import assert from '../stub/assert';\nimport {\n  promiseRejectedWith,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  transformPromiseWith\n} from './helpers/webidl';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { AcquireReadableStreamAsyncIterator, ReadableStreamAsyncIterator } from './readable-stream/async-iterator';\nimport { defaultReaderClosedPromiseReject, defaultReaderClosedPromiseResolve } from './readable-stream/generic-reader';\nimport {\n  AcquireReadableStreamDefaultReader,\n  IsReadableStreamDefaultReader,\n  ReadableStreamDefaultReader,\n  ReadableStreamDefaultReadResult\n} from './readable-stream/default-reader';\nimport {\n  AcquireReadableStreamBYOBReader,\n  IsReadableStreamBYOBReader,\n  ReadableStreamBYOBReader,\n  ReadableStreamBYOBReadResult\n} from './readable-stream/byob-reader';\nimport { ReadableStreamPipeTo } from './readable-stream/pipe';\nimport { ReadableStreamTee } from './readable-stream/tee';\nimport { IsWritableStream, IsWritableStreamLocked, WritableStream } from './writable-stream';\nimport { SimpleQueue } from './simple-queue';\nimport {\n  ReadableByteStreamController,\n  ReadableStreamBYOBRequest,\n  SetUpReadableByteStreamController,\n  SetUpReadableByteStreamControllerFromUnderlyingSource\n} from './readable-stream/byte-stream-controller';\nimport {\n  ReadableStreamDefaultController,\n  SetUpReadableStreamDefaultController,\n  SetUpReadableStreamDefaultControllerFromUnderlyingSource\n} from './readable-stream/default-controller';\nimport {\n  UnderlyingByteSource,\n  UnderlyingByteSourcePullCallback,\n  UnderlyingByteSourceStartCallback,\n  UnderlyingSource,\n  UnderlyingSourceCancelCallback,\n  UnderlyingSourcePullCallback,\n  UnderlyingSourceStartCallback\n} from './readable-stream/underlying-source';\nimport { noop } from '../utils';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { CreateArrayFromList } from './abstract-ops/ecmascript';\nimport { CancelSteps } from './abstract-ops/internal-methods';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { assertObject, assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport { convertUnderlyingDefaultOrByteSource } from './validators/underlying-source';\nimport { ReadableStreamGetReaderOptions } from './readable-stream/reader-options';\nimport { convertReaderOptions } from './validators/reader-options';\nimport { StreamPipeOptions, ValidatedStreamPipeOptions } from './readable-stream/pipe-options';\nimport { ReadableStreamIteratorOptions } from './readable-stream/iterator-options';\nimport { convertIteratorOptions } from './validators/iterator-options';\nimport { convertPipeOptions } from './validators/pipe-options';\nimport { ReadableWritablePair } from './readable-stream/readable-writable-pair';\nimport { convertReadableWritablePair } from './validators/readable-writable-pair';\n\nexport type ReadableByteStream = ReadableStream<Uint8Array> & {\n  _readableStreamController: ReadableByteStreamController\n};\n\ntype ReadableStreamState = 'readable' | 'closed' | 'errored';\n\n/**\n * A readable stream represents a source of data, from which you can read.\n *\n * @public\n */\nexport class ReadableStream<R = any> {\n  /** @internal */\n  _state!: ReadableStreamState;\n  /** @internal */\n  _reader: ReadableStreamReader<R> | undefined;\n  /** @internal */\n  _storedError: any;\n  /** @internal */\n  _disturbed!: boolean;\n  /** @internal */\n  _readableStreamController!: ReadableStreamDefaultController<R> | ReadableByteStreamController;\n\n  constructor(underlyingSource: UnderlyingByteSource, strategy?: { highWaterMark?: number; size?: undefined });\n  constructor(underlyingSource?: UnderlyingSource<R>, strategy?: QueuingStrategy<R>);\n  constructor(rawUnderlyingSource: UnderlyingSource<R> | UnderlyingByteSource | null | undefined = {},\n              rawStrategy: QueuingStrategy<R> | null | undefined = {}) {\n    if (rawUnderlyingSource === undefined) {\n      rawUnderlyingSource = null;\n    } else {\n      assertObject(rawUnderlyingSource, 'First parameter');\n    }\n\n    const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');\n    const underlyingSource = convertUnderlyingDefaultOrByteSource(rawUnderlyingSource, 'First parameter');\n\n    InitializeReadableStream(this);\n\n    if (underlyingSource.type === 'bytes') {\n      if (strategy.size !== undefined) {\n        throw new RangeError('The strategy for a byte stream cannot have a size function');\n      }\n      const highWaterMark = ExtractHighWaterMark(strategy, 0);\n      SetUpReadableByteStreamControllerFromUnderlyingSource(\n        this as unknown as ReadableByteStream,\n        underlyingSource,\n        highWaterMark\n      );\n    } else {\n      assert(underlyingSource.type === undefined);\n      const sizeAlgorithm = ExtractSizeAlgorithm(strategy);\n      const highWaterMark = ExtractHighWaterMark(strategy, 1);\n      SetUpReadableStreamDefaultControllerFromUnderlyingSource(\n        this,\n        underlyingSource,\n        highWaterMark,\n        sizeAlgorithm\n      );\n    }\n  }\n\n  /**\n   * Whether or not the readable stream is locked to a {@link ReadableStreamDefaultReader | reader}.\n   */\n  get locked(): boolean {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('locked');\n    }\n\n    return IsReadableStreamLocked(this);\n  }\n\n  /**\n   * Cancels the stream, signaling a loss of interest in the stream by a consumer.\n   *\n   * The supplied `reason` argument will be given to the underlying source's {@link UnderlyingSource.cancel | cancel()}\n   * method, which might or might not use it.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('cancel'));\n    }\n\n    if (IsReadableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot cancel a stream that already has a reader'));\n    }\n\n    return ReadableStreamCancel(this, reason);\n  }\n\n  /**\n   * Creates a {@link ReadableStreamBYOBReader} and locks the stream to the new reader.\n   *\n   * This call behaves the same way as the no-argument variant, except that it only works on readable byte streams,\n   * i.e. streams which were constructed specifically with the ability to handle \"bring your own buffer\" reading.\n   * The returned BYOB reader provides the ability to directly read individual chunks from the stream via its\n   * {@link ReadableStreamBYOBReader.read | read()} method, into developer-supplied buffers, allowing more precise\n   * control over allocation.\n   */\n  getReader({ mode }: { mode: 'byob' }): ReadableStreamBYOBReader;\n  /**\n   * Creates a {@link ReadableStreamDefaultReader} and locks the stream to the new reader.\n   * While the stream is locked, no other reader can be acquired until this one is released.\n   *\n   * This functionality is especially useful for creating abstractions that desire the ability to consume a stream\n   * in its entirety. By getting a reader for the stream, you can ensure nobody else can interleave reads with yours\n   * or cancel the stream, which would interfere with your abstraction.\n   */\n  getReader(): ReadableStreamDefaultReader<R>;\n  getReader(\n    rawOptions: ReadableStreamGetReaderOptions | null | undefined = undefined\n  ): ReadableStreamDefaultReader<R> | ReadableStreamBYOBReader {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('getReader');\n    }\n\n    const options = convertReaderOptions(rawOptions, 'First parameter');\n\n    if (options.mode === undefined) {\n      return AcquireReadableStreamDefaultReader(this);\n    }\n\n    assert(options.mode === 'byob');\n    return AcquireReadableStreamBYOBReader(this as unknown as ReadableByteStream);\n  }\n\n  /**\n   * Provides a convenient, chainable way of piping this readable stream through a transform stream\n   * (or any other `{ writable, readable }` pair). It simply {@link ReadableStream.pipeTo | pipes} the stream\n   * into the writable side of the supplied pair, and returns the readable side for further use.\n   *\n   * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.\n   */\n  pipeThrough<RS extends ReadableStream>(\n    transform: { readable: RS; writable: WritableStream<R> },\n    options?: StreamPipeOptions\n  ): RS;\n  pipeThrough<RS extends ReadableStream>(\n    rawTransform: { readable: RS; writable: WritableStream<R> } | null | undefined,\n    rawOptions: StreamPipeOptions | null | undefined = {}\n  ): RS {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('pipeThrough');\n    }\n    assertRequiredArgument(rawTransform, 1, 'pipeThrough');\n\n    const transform = convertReadableWritablePair(rawTransform, 'First parameter');\n    const options = convertPipeOptions(rawOptions, 'Second parameter');\n\n    if (IsReadableStreamLocked(this)) {\n      throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked ReadableStream');\n    }\n    if (IsWritableStreamLocked(transform.writable)) {\n      throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked WritableStream');\n    }\n\n    const promise = ReadableStreamPipeTo(\n      this, transform.writable, options.preventClose, options.preventAbort, options.preventCancel, options.signal\n    );\n\n    setPromiseIsHandledToTrue(promise);\n\n    return transform.readable;\n  }\n\n  /**\n   * Pipes this readable stream to a given writable stream. The way in which the piping process behaves under\n   * various error conditions can be customized with a number of passed options. It returns a promise that fulfills\n   * when the piping process completes successfully, or rejects if any errors were encountered.\n   *\n   * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.\n   */\n  pipeTo(destination: WritableStream<R>, options?: StreamPipeOptions): Promise<void>;\n  pipeTo(destination: WritableStream<R> | null | undefined,\n         rawOptions: StreamPipeOptions | null | undefined = {}): Promise<void> {\n    if (!IsReadableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('pipeTo'));\n    }\n\n    if (destination === undefined) {\n      return promiseRejectedWith(`Parameter 1 is required in 'pipeTo'.`);\n    }\n    if (!IsWritableStream(destination)) {\n      return promiseRejectedWith(\n        new TypeError(`ReadableStream.prototype.pipeTo's first argument must be a WritableStream`)\n      );\n    }\n\n    let options: ValidatedStreamPipeOptions;\n    try {\n      options = convertPipeOptions(rawOptions, 'Second parameter');\n    } catch (e) {\n      return promiseRejectedWith(e);\n    }\n\n    if (IsReadableStreamLocked(this)) {\n      return promiseRejectedWith(\n        new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream')\n      );\n    }\n    if (IsWritableStreamLocked(destination)) {\n      return promiseRejectedWith(\n        new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream')\n      );\n    }\n\n    return ReadableStreamPipeTo<R>(\n      this, destination, options.preventClose, options.preventAbort, options.preventCancel, options.signal\n    );\n  }\n\n  /**\n   * Tees this readable stream, returning a two-element array containing the two resulting branches as\n   * new {@link ReadableStream} instances.\n   *\n   * Teeing a stream will lock it, preventing any other consumer from acquiring a reader.\n   * To cancel the stream, cancel both of the resulting branches; a composite cancellation reason will then be\n   * propagated to the stream's underlying source.\n   *\n   * Note that the chunks seen in each branch will be the same object. If the chunks are not immutable,\n   * this could allow interference between the two branches.\n   */\n  tee(): [ReadableStream<R>, ReadableStream<R>] {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('tee');\n    }\n\n    const branches = ReadableStreamTee(this, false);\n    return CreateArrayFromList(branches);\n  }\n\n  /**\n   * Asynchronously iterates over the chunks in the stream's internal queue.\n   *\n   * Asynchronously iterating over the stream will lock it, preventing any other consumer from acquiring a reader.\n   * The lock will be released if the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method\n   * is called, e.g. by breaking out of the loop.\n   *\n   * By default, calling the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method will also\n   * cancel the stream. To prevent this, use the stream's {@link ReadableStream.values | values()} method, passing\n   * `true` for the `preventCancel` option.\n   */\n  values(options?: ReadableStreamIteratorOptions): ReadableStreamAsyncIterator<R>;\n  values(rawOptions: ReadableStreamIteratorOptions | null | undefined = undefined): ReadableStreamAsyncIterator<R> {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('values');\n    }\n\n    const options = convertIteratorOptions(rawOptions, 'First parameter');\n    return AcquireReadableStreamAsyncIterator<R>(this, options.preventCancel);\n  }\n\n  /**\n   * {@inheritDoc ReadableStream.values}\n   */\n  [Symbol.asyncIterator]: (options?: ReadableStreamIteratorOptions) => ReadableStreamAsyncIterator<R>;\n}\n\nObject.defineProperties(ReadableStream.prototype, {\n  cancel: { enumerable: true },\n  getReader: { enumerable: true },\n  pipeThrough: { enumerable: true },\n  pipeTo: { enumerable: true },\n  tee: { enumerable: true },\n  values: { enumerable: true },\n  locked: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStream.prototype, Symbol.toStringTag, {\n    value: 'ReadableStream',\n    configurable: true\n  });\n}\nif (typeof Symbol.asyncIterator === 'symbol') {\n  Object.defineProperty(ReadableStream.prototype, Symbol.asyncIterator, {\n    value: ReadableStream.prototype.values,\n    writable: true,\n    configurable: true\n  });\n}\n\nexport {\n  ReadableStreamAsyncIterator,\n  ReadableStreamDefaultReadResult,\n  ReadableStreamBYOBReadResult,\n  UnderlyingByteSource,\n  UnderlyingSource,\n  UnderlyingSourceStartCallback,\n  UnderlyingSourcePullCallback,\n  UnderlyingSourceCancelCallback,\n  UnderlyingByteSourceStartCallback,\n  UnderlyingByteSourcePullCallback,\n  StreamPipeOptions,\n  ReadableWritablePair,\n  ReadableStreamIteratorOptions\n};\n\n// Abstract operations for the ReadableStream.\n\n// Throws if and only if startAlgorithm throws.\nexport function CreateReadableStream<R>(startAlgorithm: () => void | PromiseLike<void>,\n                                        pullAlgorithm: () => Promise<void>,\n                                        cancelAlgorithm: (reason: any) => Promise<void>,\n                                        highWaterMark = 1,\n                                        sizeAlgorithm: QueuingStrategySizeCallback<R> = () => 1): ReadableStream<R> {\n  assert(IsNonNegativeNumber(highWaterMark));\n\n  const stream: ReadableStream<R> = Object.create(ReadableStream.prototype);\n  InitializeReadableStream(stream);\n\n  const controller: ReadableStreamDefaultController<R> = Object.create(ReadableStreamDefaultController.prototype);\n  SetUpReadableStreamDefaultController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm\n  );\n\n  return stream;\n}\n\n// Throws if and only if startAlgorithm throws.\nexport function CreateReadableByteStream(\n  startAlgorithm: () => void | PromiseLike<void>,\n  pullAlgorithm: () => Promise<void>,\n  cancelAlgorithm: (reason: any) => Promise<void>\n): ReadableByteStream {\n  const stream: ReadableByteStream = Object.create(ReadableStream.prototype);\n  InitializeReadableStream(stream);\n\n  const controller: ReadableByteStreamController = Object.create(ReadableByteStreamController.prototype);\n  SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, 0, undefined);\n\n  return stream;\n}\n\nfunction InitializeReadableStream(stream: ReadableStream) {\n  stream._state = 'readable';\n  stream._reader = undefined;\n  stream._storedError = undefined;\n  stream._disturbed = false;\n}\n\nexport function IsReadableStream(x: unknown): x is ReadableStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readableStreamController')) {\n    return false;\n  }\n\n  return x instanceof ReadableStream;\n}\n\nexport function IsReadableStreamDisturbed(stream: ReadableStream): boolean {\n  assert(IsReadableStream(stream));\n\n  return stream._disturbed;\n}\n\nexport function IsReadableStreamLocked(stream: ReadableStream): boolean {\n  assert(IsReadableStream(stream));\n\n  if (stream._reader === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamCancel<R>(stream: ReadableStream<R>, reason: any): Promise<undefined> {\n  stream._disturbed = true;\n\n  if (stream._state === 'closed') {\n    return promiseResolvedWith(undefined);\n  }\n  if (stream._state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  ReadableStreamClose(stream);\n\n  const reader = stream._reader;\n  if (reader !== undefined && IsReadableStreamBYOBReader(reader)) {\n    reader._readIntoRequests.forEach(readIntoRequest => {\n      readIntoRequest._closeSteps(undefined);\n    });\n    reader._readIntoRequests = new SimpleQueue();\n  }\n\n  const sourceCancelPromise = stream._readableStreamController[CancelSteps](reason);\n  return transformPromiseWith(sourceCancelPromise, noop);\n}\n\nexport function ReadableStreamClose<R>(stream: ReadableStream<R>): void {\n  assert(stream._state === 'readable');\n\n  stream._state = 'closed';\n\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return;\n  }\n\n  defaultReaderClosedPromiseResolve(reader);\n\n  if (IsReadableStreamDefaultReader<R>(reader)) {\n    reader._readRequests.forEach(readRequest => {\n      readRequest._closeSteps();\n    });\n    reader._readRequests = new SimpleQueue();\n  }\n}\n\nexport function ReadableStreamError<R>(stream: ReadableStream<R>, e: any): void {\n  assert(IsReadableStream(stream));\n  assert(stream._state === 'readable');\n\n  stream._state = 'errored';\n  stream._storedError = e;\n\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return;\n  }\n\n  defaultReaderClosedPromiseReject(reader, e);\n\n  if (IsReadableStreamDefaultReader<R>(reader)) {\n    reader._readRequests.forEach(readRequest => {\n      readRequest._errorSteps(e);\n    });\n\n    reader._readRequests = new SimpleQueue();\n  } else {\n    assert(IsReadableStreamBYOBReader(reader));\n\n    reader._readIntoRequests.forEach(readIntoRequest => {\n      readIntoRequest._errorSteps(e);\n    });\n\n    reader._readIntoRequests = new SimpleQueue();\n  }\n}\n\n// Readers\n\nexport type ReadableStreamReader<R> = ReadableStreamDefaultReader<R> | ReadableStreamBYOBReader;\n\nexport {\n  ReadableStreamDefaultReader,\n  ReadableStreamBYOBReader\n};\n\n// Controllers\n\nexport {\n  ReadableStreamDefaultController,\n  ReadableStreamBYOBRequest,\n  ReadableByteStreamController\n};\n\n// Helper functions for the ReadableStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(`ReadableStream.prototype.${name} can only be used on a ReadableStream`);\n}\n","import { assertDictionary, assertRequiredField } from './basic';\nimport { ReadableStream } from '../readable-stream';\nimport { WritableStream } from '../writable-stream';\nimport { assertReadableStream } from './readable-stream';\nimport { assertWritableStream } from './writable-stream';\n\nexport function convertReadableWritablePair<RS extends ReadableStream, WS extends WritableStream>(\n  pair: { readable: RS; writable: WS } | null | undefined,\n  context: string\n): { readable: RS; writable: WS } {\n  assertDictionary(pair, context);\n\n  const readable = pair?.readable;\n  assertRequiredField(readable, 'readable', 'ReadableWritablePair');\n  assertReadableStream(readable, `${context} has member 'readable' that`);\n\n  const writable = pair?.writable;\n  assertRequiredField(writable, 'writable', 'ReadableWritablePair');\n  assertWritableStream(writable, `${context} has member 'writable' that`);\n\n  return { readable, writable };\n}\n","import { assertDictionary } from './basic';\nimport {\n  ReadableStreamIteratorOptions,\n  ValidatedReadableStreamIteratorOptions\n} from '../readable-stream/iterator-options';\n\nexport function convertIteratorOptions(options: ReadableStreamIteratorOptions | null | undefined,\n                                       context: string): ValidatedReadableStreamIteratorOptions {\n  assertDictionary(options, context);\n  const preventCancel = options?.preventCancel;\n  return { preventCancel: Boolean(preventCancel) };\n}\n","import { QueuingStrategyInit } from '../queuing-strategy';\nimport { assertDictionary, assertRequiredField, convertUnrestrictedDouble } from './basic';\n\nexport function convertQueuingStrategyInit(init: QueuingStrategyInit | null | undefined,\n                                           context: string): QueuingStrategyInit {\n  assertDictionary(init, context);\n  const highWaterMark = init?.highWaterMark;\n  assertRequiredField(highWaterMark, 'highWaterMark', 'QueuingStrategyInit');\n  return {\n    highWaterMark: convertUnrestrictedDouble(highWaterMark)\n  };\n}\n","import { QueuingStrategy, QueuingStrategyInit } from './queuing-strategy';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategyInit } from './validators/queuing-strategy-init';\n\n// The size function must not have a prototype property nor be a constructor\nconst byteLengthSizeFunction = (chunk: ArrayBufferView): number => {\n  return chunk.byteLength;\n};\ntry {\n  Object.defineProperty(byteLengthSizeFunction, 'name', {\n    value: 'size',\n    configurable: true\n  });\n} catch {\n  // This property is non-configurable in older browsers, so ignore if this throws.\n  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility\n}\n\n/**\n * A queuing strategy that counts the number of bytes in each chunk.\n *\n * @public\n */\nexport default class ByteLengthQueuingStrategy implements QueuingStrategy<ArrayBufferView> {\n  /** @internal */\n  readonly _byteLengthQueuingStrategyHighWaterMark: number;\n\n  constructor(options: QueuingStrategyInit) {\n    assertRequiredArgument(options, 1, 'ByteLengthQueuingStrategy');\n    options = convertQueuingStrategyInit(options, 'First parameter');\n    this._byteLengthQueuingStrategyHighWaterMark = options.highWaterMark;\n  }\n\n  /**\n   * Returns the high water mark provided to the constructor.\n   */\n  get highWaterMark(): number {\n    if (!IsByteLengthQueuingStrategy(this)) {\n      throw byteLengthBrandCheckException('highWaterMark');\n    }\n    return this._byteLengthQueuingStrategyHighWaterMark;\n  }\n\n  /**\n   * Measures the size of `chunk` by returning the value of its `byteLength` property.\n   */\n  get size(): (chunk: ArrayBufferView) => number {\n    if (!IsByteLengthQueuingStrategy(this)) {\n      throw byteLengthBrandCheckException('size');\n    }\n    return byteLengthSizeFunction;\n  }\n}\n\nObject.defineProperties(ByteLengthQueuingStrategy.prototype, {\n  highWaterMark: { enumerable: true },\n  size: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ByteLengthQueuingStrategy.prototype, Symbol.toStringTag, {\n    value: 'ByteLengthQueuingStrategy',\n    configurable: true\n  });\n}\n\n// Helper functions for the ByteLengthQueuingStrategy.\n\nfunction byteLengthBrandCheckException(name: string): TypeError {\n  return new TypeError(`ByteLengthQueuingStrategy.prototype.${name} can only be used on a ByteLengthQueuingStrategy`);\n}\n\nexport function IsByteLengthQueuingStrategy(x: any): x is ByteLengthQueuingStrategy {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_byteLengthQueuingStrategyHighWaterMark')) {\n    return false;\n  }\n\n  return x instanceof ByteLengthQueuingStrategy;\n}\n","import { QueuingStrategy, QueuingStrategyInit } from './queuing-strategy';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategyInit } from './validators/queuing-strategy-init';\n\n// The size function must not have a prototype property nor be a constructor\nconst countSizeFunction = (): 1 => {\n  return 1;\n};\ntry {\n  Object.defineProperty(countSizeFunction, 'name', {\n    value: 'size',\n    configurable: true\n  });\n} catch {\n  // This property is non-configurable in older browsers, so ignore if this throws.\n  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility\n}\n\n/**\n * A queuing strategy that counts the number of chunks.\n *\n * @public\n */\nexport default class CountQueuingStrategy implements QueuingStrategy<any> {\n  /** @internal */\n  readonly _countQueuingStrategyHighWaterMark!: number;\n\n  constructor(options: QueuingStrategyInit) {\n    assertRequiredArgument(options, 1, 'CountQueuingStrategy');\n    options = convertQueuingStrategyInit(options, 'First parameter');\n    this._countQueuingStrategyHighWaterMark = options.highWaterMark;\n  }\n\n  /**\n   * Returns the high water mark provided to the constructor.\n   */\n  get highWaterMark(): number {\n    if (!IsCountQueuingStrategy(this)) {\n      throw countBrandCheckException('highWaterMark');\n    }\n    return this._countQueuingStrategyHighWaterMark;\n  }\n\n  /**\n   * Measures the size of `chunk` by always returning 1.\n   * This ensures that the total queue size is a count of the number of chunks in the queue.\n   */\n  get size(): (chunk: any) => 1 {\n    if (!IsCountQueuingStrategy(this)) {\n      throw countBrandCheckException('size');\n    }\n    return countSizeFunction;\n  }\n}\n\nObject.defineProperties(CountQueuingStrategy.prototype, {\n  highWaterMark: { enumerable: true },\n  size: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(CountQueuingStrategy.prototype, Symbol.toStringTag, {\n    value: 'CountQueuingStrategy',\n    configurable: true\n  });\n}\n\n// Helper functions for the CountQueuingStrategy.\n\nfunction countBrandCheckException(name: string): TypeError {\n  return new TypeError(`CountQueuingStrategy.prototype.${name} can only be used on a CountQueuingStrategy`);\n}\n\nexport function IsCountQueuingStrategy(x: any): x is CountQueuingStrategy {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_countQueuingStrategyHighWaterMark')) {\n    return false;\n  }\n\n  return x instanceof CountQueuingStrategy;\n}\n","import { assertDictionary, assertFunction } from './basic';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\nimport {\n  Transformer,\n  TransformerFlushCallback,\n  TransformerStartCallback,\n  TransformerTransformCallback,\n  ValidatedTransformer\n} from '../transform-stream/transformer';\nimport { TransformStreamDefaultController } from '../transform-stream';\n\nexport function convertTransformer<I, O>(original: Transformer<I, O> | null,\n                                         context: string): ValidatedTransformer<I, O> {\n  assertDictionary(original, context);\n  const flush = original?.flush;\n  const readableType = original?.readableType;\n  const start = original?.start;\n  const transform = original?.transform;\n  const writableType = original?.writableType;\n  return {\n    flush: flush === undefined ?\n      undefined :\n      convertTransformerFlushCallback(flush, original!, `${context} has member 'flush' that`),\n    readableType,\n    start: start === undefined ?\n      undefined :\n      convertTransformerStartCallback(start, original!, `${context} has member 'start' that`),\n    transform: transform === undefined ?\n      undefined :\n      convertTransformerTransformCallback(transform, original!, `${context} has member 'transform' that`),\n    writableType\n  };\n}\n\nfunction convertTransformerFlushCallback<I, O>(\n  fn: TransformerFlushCallback<O>,\n  original: Transformer<I, O>,\n  context: string\n): (controller: TransformStreamDefaultController<O>) => Promise<void> {\n  assertFunction(fn, context);\n  return (controller: TransformStreamDefaultController<O>) => promiseCall(fn, original, [controller]);\n}\n\nfunction convertTransformerStartCallback<I, O>(\n  fn: TransformerStartCallback<O>,\n  original: Transformer<I, O>,\n  context: string\n): TransformerStartCallback<O> {\n  assertFunction(fn, context);\n  return (controller: TransformStreamDefaultController<O>) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertTransformerTransformCallback<I, O>(\n  fn: TransformerTransformCallback<I, O>,\n  original: Transformer<I, O>,\n  context: string\n): (chunk: I, controller: TransformStreamDefaultController<O>) => Promise<void> {\n  assertFunction(fn, context);\n  return (chunk: I, controller: TransformStreamDefaultController<O>) => promiseCall(fn, original, [chunk, controller]);\n}\n","import assert from '../stub/assert';\nimport { newPromise, promiseRejectedWith, promiseResolvedWith, transformPromiseWith } from './helpers/webidl';\nimport { CreateReadableStream, ReadableStream, ReadableStreamDefaultController } from './readable-stream';\nimport {\n  ReadableStreamDefaultControllerCanCloseOrEnqueue,\n  ReadableStreamDefaultControllerClose,\n  ReadableStreamDefaultControllerEnqueue,\n  ReadableStreamDefaultControllerError,\n  ReadableStreamDefaultControllerGetDesiredSize,\n  ReadableStreamDefaultControllerHasBackpressure\n} from './readable-stream/default-controller';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { CreateWritableStream, WritableStream, WritableStreamDefaultControllerErrorIfNeeded } from './writable-stream';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport {\n  Transformer,\n  TransformerFlushCallback,\n  TransformerStartCallback,\n  TransformerTransformCallback,\n  ValidatedTransformer\n} from './transform-stream/transformer';\nimport { convertTransformer } from './validators/transformer';\n\n// Class TransformStream\n\n/**\n * A transform stream consists of a pair of streams: a {@link WritableStream | writable stream},\n * known as its writable side, and a {@link ReadableStream | readable stream}, known as its readable side.\n * In a manner specific to the transform stream in question, writes to the writable side result in new data being\n * made available for reading from the readable side.\n *\n * @public\n */\nexport class TransformStream<I = any, O = any> {\n  /** @internal */\n  _writable!: WritableStream<I>;\n  /** @internal */\n  _readable!: ReadableStream<O>;\n  /** @internal */\n  _backpressure!: boolean;\n  /** @internal */\n  _backpressureChangePromise!: Promise<void>;\n  /** @internal */\n  _backpressureChangePromise_resolve!: () => void;\n  /** @internal */\n  _transformStreamController!: TransformStreamDefaultController<O>;\n\n  constructor(\n    transformer?: Transformer<I, O>,\n    writableStrategy?: QueuingStrategy<I>,\n    readableStrategy?: QueuingStrategy<O>\n  );\n  constructor(rawTransformer: Transformer<I, O> | null | undefined = {},\n              rawWritableStrategy: QueuingStrategy<I> | null | undefined = {},\n              rawReadableStrategy: QueuingStrategy<O> | null | undefined = {}) {\n    if (rawTransformer === undefined) {\n      rawTransformer = null;\n    }\n\n    const writableStrategy = convertQueuingStrategy(rawWritableStrategy, 'Second parameter');\n    const readableStrategy = convertQueuingStrategy(rawReadableStrategy, 'Third parameter');\n\n    const transformer = convertTransformer(rawTransformer, 'First parameter');\n    if (transformer.readableType !== undefined) {\n      throw new RangeError('Invalid readableType specified');\n    }\n    if (transformer.writableType !== undefined) {\n      throw new RangeError('Invalid writableType specified');\n    }\n\n    const readableHighWaterMark = ExtractHighWaterMark(readableStrategy, 0);\n    const readableSizeAlgorithm = ExtractSizeAlgorithm(readableStrategy);\n    const writableHighWaterMark = ExtractHighWaterMark(writableStrategy, 1);\n    const writableSizeAlgorithm = ExtractSizeAlgorithm(writableStrategy);\n\n    let startPromise_resolve!: (value: void | PromiseLike<void>) => void;\n    const startPromise = newPromise<void>(resolve => {\n      startPromise_resolve = resolve;\n    });\n\n    InitializeTransformStream(\n      this, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm\n    );\n    SetUpTransformStreamDefaultControllerFromTransformer(this, transformer);\n\n    if (transformer.start !== undefined) {\n      startPromise_resolve(transformer.start(this._transformStreamController));\n    } else {\n      startPromise_resolve(undefined);\n    }\n  }\n\n  /**\n   * The readable side of the transform stream.\n   */\n  get readable(): ReadableStream<O> {\n    if (!IsTransformStream(this)) {\n      throw streamBrandCheckException('readable');\n    }\n\n    return this._readable;\n  }\n\n  /**\n   * The writable side of the transform stream.\n   */\n  get writable(): WritableStream<I> {\n    if (!IsTransformStream(this)) {\n      throw streamBrandCheckException('writable');\n    }\n\n    return this._writable;\n  }\n}\n\nObject.defineProperties(TransformStream.prototype, {\n  readable: { enumerable: true },\n  writable: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(TransformStream.prototype, Symbol.toStringTag, {\n    value: 'TransformStream',\n    configurable: true\n  });\n}\n\nexport {\n  Transformer,\n  TransformerStartCallback,\n  TransformerFlushCallback,\n  TransformerTransformCallback\n};\n\n// Transform Stream Abstract Operations\n\nexport function CreateTransformStream<I, O>(startAlgorithm: () => void | PromiseLike<void>,\n                                            transformAlgorithm: (chunk: I) => Promise<void>,\n                                            flushAlgorithm: () => Promise<void>,\n                                            writableHighWaterMark = 1,\n                                            writableSizeAlgorithm: QueuingStrategySizeCallback<I> = () => 1,\n                                            readableHighWaterMark = 0,\n                                            readableSizeAlgorithm: QueuingStrategySizeCallback<O> = () => 1) {\n  assert(IsNonNegativeNumber(writableHighWaterMark));\n  assert(IsNonNegativeNumber(readableHighWaterMark));\n\n  const stream: TransformStream<I, O> = Object.create(TransformStream.prototype);\n\n  let startPromise_resolve!: (value: void | PromiseLike<void>) => void;\n  const startPromise = newPromise<void>(resolve => {\n    startPromise_resolve = resolve;\n  });\n\n  InitializeTransformStream(stream, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark,\n                            readableSizeAlgorithm);\n\n  const controller: TransformStreamDefaultController<O> = Object.create(TransformStreamDefaultController.prototype);\n\n  SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);\n\n  const startResult = startAlgorithm();\n  startPromise_resolve(startResult);\n  return stream;\n}\n\nfunction InitializeTransformStream<I, O>(stream: TransformStream<I, O>,\n                                         startPromise: Promise<void>,\n                                         writableHighWaterMark: number,\n                                         writableSizeAlgorithm: QueuingStrategySizeCallback<I>,\n                                         readableHighWaterMark: number,\n                                         readableSizeAlgorithm: QueuingStrategySizeCallback<O>) {\n  function startAlgorithm(): Promise<void> {\n    return startPromise;\n  }\n\n  function writeAlgorithm(chunk: I): Promise<void> {\n    return TransformStreamDefaultSinkWriteAlgorithm(stream, chunk);\n  }\n\n  function abortAlgorithm(reason: any): Promise<void> {\n    return TransformStreamDefaultSinkAbortAlgorithm(stream, reason);\n  }\n\n  function closeAlgorithm(): Promise<void> {\n    return TransformStreamDefaultSinkCloseAlgorithm(stream);\n  }\n\n  stream._writable = CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm,\n                                          writableHighWaterMark, writableSizeAlgorithm);\n\n  function pullAlgorithm(): Promise<void> {\n    return TransformStreamDefaultSourcePullAlgorithm(stream);\n  }\n\n  function cancelAlgorithm(reason: any): Promise<void> {\n    TransformStreamErrorWritableAndUnblockWrite(stream, reason);\n    return promiseResolvedWith(undefined);\n  }\n\n  stream._readable = CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, readableHighWaterMark,\n                                          readableSizeAlgorithm);\n\n  // The [[backpressure]] slot is set to undefined so that it can be initialised by TransformStreamSetBackpressure.\n  stream._backpressure = undefined!;\n  stream._backpressureChangePromise = undefined!;\n  stream._backpressureChangePromise_resolve = undefined!;\n  TransformStreamSetBackpressure(stream, true);\n\n  stream._transformStreamController = undefined!;\n}\n\nfunction IsTransformStream(x: unknown): x is TransformStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_transformStreamController')) {\n    return false;\n  }\n\n  return x instanceof TransformStream;\n}\n\n// This is a no-op if both sides are already errored.\nfunction TransformStreamError(stream: TransformStream, e: any) {\n  ReadableStreamDefaultControllerError(\n    stream._readable._readableStreamController as ReadableStreamDefaultController<any>,\n    e\n  );\n  TransformStreamErrorWritableAndUnblockWrite(stream, e);\n}\n\nfunction TransformStreamErrorWritableAndUnblockWrite(stream: TransformStream, e: any) {\n  TransformStreamDefaultControllerClearAlgorithms(stream._transformStreamController);\n  WritableStreamDefaultControllerErrorIfNeeded(stream._writable._writableStreamController, e);\n  if (stream._backpressure) {\n    // Pretend that pull() was called to permit any pending write() calls to complete. TransformStreamSetBackpressure()\n    // cannot be called from enqueue() or pull() once the ReadableStream is errored, so this will will be the final time\n    // _backpressure is set.\n    TransformStreamSetBackpressure(stream, false);\n  }\n}\n\nfunction TransformStreamSetBackpressure(stream: TransformStream, backpressure: boolean) {\n  // Passes also when called during construction.\n  assert(stream._backpressure !== backpressure);\n\n  if (stream._backpressureChangePromise !== undefined) {\n    stream._backpressureChangePromise_resolve();\n  }\n\n  stream._backpressureChangePromise = newPromise(resolve => {\n    stream._backpressureChangePromise_resolve = resolve;\n  });\n\n  stream._backpressure = backpressure;\n}\n\n// Class TransformStreamDefaultController\n\n/**\n * Allows control of the {@link ReadableStream} and {@link WritableStream} of the associated {@link TransformStream}.\n *\n * @public\n */\nexport class TransformStreamDefaultController<O> {\n  /** @internal */\n  _controlledTransformStream: TransformStream<any, O>;\n  /** @internal */\n  _transformAlgorithm: (chunk: any) => Promise<void>;\n  /** @internal */\n  _flushAlgorithm: () => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the desired size to fill the readable side’s internal queue. It can be negative, if the queue is over-full.\n   */\n  get desiredSize(): number | null {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('desiredSize');\n    }\n\n    const readableController = this._controlledTransformStream._readable._readableStreamController;\n    return ReadableStreamDefaultControllerGetDesiredSize(readableController as ReadableStreamDefaultController<O>);\n  }\n\n  /**\n   * Enqueues the given chunk `chunk` in the readable side of the controlled transform stream.\n   */\n  enqueue(chunk: O): void;\n  enqueue(chunk: O = undefined!): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('enqueue');\n    }\n\n    TransformStreamDefaultControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors both the readable side and the writable side of the controlled transform stream, making all future\n   * interactions with it fail with the given error `e`. Any chunks queued for transformation will be discarded.\n   */\n  error(reason: any = undefined): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n\n    TransformStreamDefaultControllerError(this, reason);\n  }\n\n  /**\n   * Closes the readable side and errors the writable side of the controlled transform stream. This is useful when the\n   * transformer only needs to consume a portion of the chunks written to the writable side.\n   */\n  terminate(): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('terminate');\n    }\n\n    TransformStreamDefaultControllerTerminate(this);\n  }\n}\n\nObject.defineProperties(TransformStreamDefaultController.prototype, {\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  terminate: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(TransformStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'TransformStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Transform Stream Default Controller Abstract Operations\n\nfunction IsTransformStreamDefaultController<O = any>(x: any): x is TransformStreamDefaultController<O> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledTransformStream')) {\n    return false;\n  }\n\n  return x instanceof TransformStreamDefaultController;\n}\n\nfunction SetUpTransformStreamDefaultController<I, O>(stream: TransformStream<I, O>,\n                                                     controller: TransformStreamDefaultController<O>,\n                                                     transformAlgorithm: (chunk: I) => Promise<void>,\n                                                     flushAlgorithm: () => Promise<void>) {\n  assert(IsTransformStream(stream));\n  assert(stream._transformStreamController === undefined);\n\n  controller._controlledTransformStream = stream;\n  stream._transformStreamController = controller;\n\n  controller._transformAlgorithm = transformAlgorithm;\n  controller._flushAlgorithm = flushAlgorithm;\n}\n\nfunction SetUpTransformStreamDefaultControllerFromTransformer<I, O>(stream: TransformStream<I, O>,\n                                                                    transformer: ValidatedTransformer<I, O>) {\n  const controller: TransformStreamDefaultController<O> = Object.create(TransformStreamDefaultController.prototype);\n\n  let transformAlgorithm = (chunk: I): Promise<void> => {\n    try {\n      TransformStreamDefaultControllerEnqueue(controller, chunk as unknown as O);\n      return promiseResolvedWith(undefined);\n    } catch (transformResultE) {\n      return promiseRejectedWith(transformResultE);\n    }\n  };\n\n  let flushAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (transformer.transform !== undefined) {\n    transformAlgorithm = chunk => transformer.transform!(chunk, controller);\n  }\n  if (transformer.flush !== undefined) {\n    flushAlgorithm = () => transformer.flush!(controller);\n  }\n\n  SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);\n}\n\nfunction TransformStreamDefaultControllerClearAlgorithms(controller: TransformStreamDefaultController<any>) {\n  controller._transformAlgorithm = undefined!;\n  controller._flushAlgorithm = undefined!;\n}\n\nfunction TransformStreamDefaultControllerEnqueue<O>(controller: TransformStreamDefaultController<O>, chunk: O) {\n  const stream = controller._controlledTransformStream;\n  const readableController = stream._readable._readableStreamController as ReadableStreamDefaultController<O>;\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(readableController)) {\n    throw new TypeError('Readable side is not in a state that permits enqueue');\n  }\n\n  // We throttle transform invocations based on the backpressure of the ReadableStream, but we still\n  // accept TransformStreamDefaultControllerEnqueue() calls.\n\n  try {\n    ReadableStreamDefaultControllerEnqueue(readableController, chunk);\n  } catch (e) {\n    // This happens when readableStrategy.size() throws.\n    TransformStreamErrorWritableAndUnblockWrite(stream, e);\n\n    throw stream._readable._storedError;\n  }\n\n  const backpressure = ReadableStreamDefaultControllerHasBackpressure(readableController);\n  if (backpressure !== stream._backpressure) {\n    assert(backpressure);\n    TransformStreamSetBackpressure(stream, true);\n  }\n}\n\nfunction TransformStreamDefaultControllerError(controller: TransformStreamDefaultController<any>, e: any) {\n  TransformStreamError(controller._controlledTransformStream, e);\n}\n\nfunction TransformStreamDefaultControllerPerformTransform<I, O>(controller: TransformStreamDefaultController<O>,\n                                                                chunk: I) {\n  const transformPromise = controller._transformAlgorithm(chunk);\n  return transformPromiseWith(transformPromise, undefined, r => {\n    TransformStreamError(controller._controlledTransformStream, r);\n    throw r;\n  });\n}\n\nfunction TransformStreamDefaultControllerTerminate<O>(controller: TransformStreamDefaultController<O>) {\n  const stream = controller._controlledTransformStream;\n  const readableController = stream._readable._readableStreamController as ReadableStreamDefaultController<O>;\n\n  ReadableStreamDefaultControllerClose(readableController);\n\n  const error = new TypeError('TransformStream terminated');\n  TransformStreamErrorWritableAndUnblockWrite(stream, error);\n}\n\n// TransformStreamDefaultSink Algorithms\n\nfunction TransformStreamDefaultSinkWriteAlgorithm<I, O>(stream: TransformStream<I, O>, chunk: I): Promise<void> {\n  assert(stream._writable._state === 'writable');\n\n  const controller = stream._transformStreamController;\n\n  if (stream._backpressure) {\n    const backpressureChangePromise = stream._backpressureChangePromise;\n    assert(backpressureChangePromise !== undefined);\n    return transformPromiseWith(backpressureChangePromise, () => {\n      const writable = stream._writable;\n      const state = writable._state;\n      if (state === 'erroring') {\n        throw writable._storedError;\n      }\n      assert(state === 'writable');\n      return TransformStreamDefaultControllerPerformTransform<I, O>(controller, chunk);\n    });\n  }\n\n  return TransformStreamDefaultControllerPerformTransform<I, O>(controller, chunk);\n}\n\nfunction TransformStreamDefaultSinkAbortAlgorithm(stream: TransformStream, reason: any): Promise<void> {\n  // abort() is not called synchronously, so it is possible for abort() to be called when the stream is already\n  // errored.\n  TransformStreamError(stream, reason);\n  return promiseResolvedWith(undefined);\n}\n\nfunction TransformStreamDefaultSinkCloseAlgorithm<I, O>(stream: TransformStream<I, O>): Promise<void> {\n  // stream._readable cannot change after construction, so caching it across a call to user code is safe.\n  const readable = stream._readable;\n\n  const controller = stream._transformStreamController;\n  const flushPromise = controller._flushAlgorithm();\n  TransformStreamDefaultControllerClearAlgorithms(controller);\n\n  // Return a promise that is fulfilled with undefined on success.\n  return transformPromiseWith(flushPromise, () => {\n    if (readable._state === 'errored') {\n      throw readable._storedError;\n    }\n    ReadableStreamDefaultControllerClose(readable._readableStreamController as ReadableStreamDefaultController<O>);\n  }, r => {\n    TransformStreamError(stream, r);\n    throw readable._storedError;\n  });\n}\n\n// TransformStreamDefaultSource Algorithms\n\nfunction TransformStreamDefaultSourcePullAlgorithm(stream: TransformStream): Promise<void> {\n  // Invariant. Enforced by the promises returned by start() and pull().\n  assert(stream._backpressure);\n\n  assert(stream._backpressureChangePromise !== undefined);\n\n  TransformStreamSetBackpressure(stream, false);\n\n  // Prevent the next pull() call until there is backpressure.\n  return stream._backpressureChangePromise;\n}\n\n// Helper functions for the TransformStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `TransformStreamDefaultController.prototype.${name} can only be used on a TransformStreamDefaultController`);\n}\n\n// Helper functions for the TransformStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `TransformStream.prototype.${name} can only be used on a TransformStream`);\n}\n","import {\n  ByteLengthQueuingStrategy,\n  CountQueuingStrategy,\n  ReadableByteStreamController,\n  ReadableStream,\n  ReadableStreamBYOBReader,\n  ReadableStreamBYOBRequest,\n  ReadableStreamDefaultController,\n  ReadableStreamDefaultReader,\n  TransformStream,\n  TransformStreamDefaultController,\n  WritableStream,\n  WritableStreamDefaultController,\n  WritableStreamDefaultWriter\n} from './ponyfill';\nimport { globals } from './utils';\n\n// Export\nexport * from './ponyfill';\n\nconst exports = {\n  ReadableStream,\n  ReadableStreamDefaultController,\n  ReadableByteStreamController,\n  ReadableStreamBYOBRequest,\n  ReadableStreamDefaultReader,\n  ReadableStreamBYOBReader,\n\n  WritableStream,\n  WritableStreamDefaultController,\n  WritableStreamDefaultWriter,\n\n  ByteLengthQueuingStrategy,\n  CountQueuingStrategy,\n\n  TransformStream,\n  TransformStreamDefaultController\n};\n\n// Add classes to global scope\nif (typeof globals !== 'undefined') {\n  for (const prop in exports) {\n    if (Object.prototype.hasOwnProperty.call(exports, prop)) {\n      Object.defineProperty(globals, prop, {\n        value: exports[prop as (keyof typeof exports)],\n        writable: true,\n        configurable: true\n      });\n    }\n  }\n}\n"],"names":["SymbolPolyfill","Symbol","iterator","description","noop","globals","self","window","global","typeIsObject","x","rethrowAssertionErrorRejection","originalPromise","Promise","originalPromiseThen","prototype","then","originalPromiseResolve","resolve","bind","originalPromiseReject","reject","newPromise","executor","promiseResolvedWith","value","promiseRejectedWith","reason","PerformPromiseThen","promise","onFulfilled","onRejected","call","uponPromise","undefined","uponFulfillment","uponRejection","transformPromiseWith","fulfillmentHandler","rejectionHandler","setPromiseIsHandledToTrue","queueMicrotask","globalQueueMicrotask","resolvedPromise","fn","reflectCall","F","V","args","TypeError","Function","apply","promiseCall","SimpleQueue","[object 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\ No newline at end of file
diff --git a/node_modules/web-streams-polyfill/dist/polyfill.es2018.mjs b/node_modules/web-streams-polyfill/dist/polyfill.es2018.mjs
new file mode 100644
index 0000000..b764c06
--- /dev/null
+++ b/node_modules/web-streams-polyfill/dist/polyfill.es2018.mjs
@@ -0,0 +1,4219 @@
+/**
+ * web-streams-polyfill v3.2.1
+ */
+/// <reference lib="es2015.symbol" />
+const SymbolPolyfill = typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol' ?
+    Symbol :
+    description => `Symbol(${description})`;
+
+/// <reference lib="dom" />
+function noop() {
+    return undefined;
+}
+function getGlobals() {
+    if (typeof self !== 'undefined') {
+        return self;
+    }
+    else if (typeof window !== 'undefined') {
+        return window;
+    }
+    else if (typeof global !== 'undefined') {
+        return global;
+    }
+    return undefined;
+}
+const globals = getGlobals();
+
+function typeIsObject(x) {
+    return (typeof x === 'object' && x !== null) || typeof x === 'function';
+}
+const rethrowAssertionErrorRejection = noop;
+
+const originalPromise = Promise;
+const originalPromiseThen = Promise.prototype.then;
+const originalPromiseResolve = Promise.resolve.bind(originalPromise);
+const originalPromiseReject = Promise.reject.bind(originalPromise);
+function newPromise(executor) {
+    return new originalPromise(executor);
+}
+function promiseResolvedWith(value) {
+    return originalPromiseResolve(value);
+}
+function promiseRejectedWith(reason) {
+    return originalPromiseReject(reason);
+}
+function PerformPromiseThen(promise, onFulfilled, onRejected) {
+    // There doesn't appear to be any way to correctly emulate the behaviour from JavaScript, so this is just an
+    // approximation.
+    return originalPromiseThen.call(promise, onFulfilled, onRejected);
+}
+function uponPromise(promise, onFulfilled, onRejected) {
+    PerformPromiseThen(PerformPromiseThen(promise, onFulfilled, onRejected), undefined, rethrowAssertionErrorRejection);
+}
+function uponFulfillment(promise, onFulfilled) {
+    uponPromise(promise, onFulfilled);
+}
+function uponRejection(promise, onRejected) {
+    uponPromise(promise, undefined, onRejected);
+}
+function transformPromiseWith(promise, fulfillmentHandler, rejectionHandler) {
+    return PerformPromiseThen(promise, fulfillmentHandler, rejectionHandler);
+}
+function setPromiseIsHandledToTrue(promise) {
+    PerformPromiseThen(promise, undefined, rethrowAssertionErrorRejection);
+}
+const queueMicrotask = (() => {
+    const globalQueueMicrotask = globals && globals.queueMicrotask;
+    if (typeof globalQueueMicrotask === 'function') {
+        return globalQueueMicrotask;
+    }
+    const resolvedPromise = promiseResolvedWith(undefined);
+    return (fn) => PerformPromiseThen(resolvedPromise, fn);
+})();
+function reflectCall(F, V, args) {
+    if (typeof F !== 'function') {
+        throw new TypeError('Argument is not a function');
+    }
+    return Function.prototype.apply.call(F, V, args);
+}
+function promiseCall(F, V, args) {
+    try {
+        return promiseResolvedWith(reflectCall(F, V, args));
+    }
+    catch (value) {
+        return promiseRejectedWith(value);
+    }
+}
+
+// Original from Chromium
+// https://chromium.googlesource.com/chromium/src/+/0aee4434a4dba42a42abaea9bfbc0cd196a63bc1/third_party/blink/renderer/core/streams/SimpleQueue.js
+const QUEUE_MAX_ARRAY_SIZE = 16384;
+/**
+ * Simple queue structure.
+ *
+ * Avoids scalability issues with using a packed array directly by using
+ * multiple arrays in a linked list and keeping the array size bounded.
+ */
+class SimpleQueue {
+    constructor() {
+        this._cursor = 0;
+        this._size = 0;
+        // _front and _back are always defined.
+        this._front = {
+            _elements: [],
+            _next: undefined
+        };
+        this._back = this._front;
+        // The cursor is used to avoid calling Array.shift().
+        // It contains the index of the front element of the array inside the
+        // front-most node. It is always in the range [0, QUEUE_MAX_ARRAY_SIZE).
+        this._cursor = 0;
+        // When there is only one node, size === elements.length - cursor.
+        this._size = 0;
+    }
+    get length() {
+        return this._size;
+    }
+    // For exception safety, this method is structured in order:
+    // 1. Read state
+    // 2. Calculate required state mutations
+    // 3. Perform state mutations
+    push(element) {
+        const oldBack = this._back;
+        let newBack = oldBack;
+        if (oldBack._elements.length === QUEUE_MAX_ARRAY_SIZE - 1) {
+            newBack = {
+                _elements: [],
+                _next: undefined
+            };
+        }
+        // push() is the mutation most likely to throw an exception, so it
+        // goes first.
+        oldBack._elements.push(element);
+        if (newBack !== oldBack) {
+            this._back = newBack;
+            oldBack._next = newBack;
+        }
+        ++this._size;
+    }
+    // Like push(), shift() follows the read -> calculate -> mutate pattern for
+    // exception safety.
+    shift() { // must not be called on an empty queue
+        const oldFront = this._front;
+        let newFront = oldFront;
+        const oldCursor = this._cursor;
+        let newCursor = oldCursor + 1;
+        const elements = oldFront._elements;
+        const element = elements[oldCursor];
+        if (newCursor === QUEUE_MAX_ARRAY_SIZE) {
+            newFront = oldFront._next;
+            newCursor = 0;
+        }
+        // No mutations before this point.
+        --this._size;
+        this._cursor = newCursor;
+        if (oldFront !== newFront) {
+            this._front = newFront;
+        }
+        // Permit shifted element to be garbage collected.
+        elements[oldCursor] = undefined;
+        return element;
+    }
+    // The tricky thing about forEach() is that it can be called
+    // re-entrantly. The queue may be mutated inside the callback. It is easy to
+    // see that push() within the callback has no negative effects since the end
+    // of the queue is checked for on every iteration. If shift() is called
+    // repeatedly within the callback then the next iteration may return an
+    // element that has been removed. In this case the callback will be called
+    // with undefined values until we either "catch up" with elements that still
+    // exist or reach the back of the queue.
+    forEach(callback) {
+        let i = this._cursor;
+        let node = this._front;
+        let elements = node._elements;
+        while (i !== elements.length || node._next !== undefined) {
+            if (i === elements.length) {
+                node = node._next;
+                elements = node._elements;
+                i = 0;
+                if (elements.length === 0) {
+                    break;
+                }
+            }
+            callback(elements[i]);
+            ++i;
+        }
+    }
+    // Return the element that would be returned if shift() was called now,
+    // without modifying the queue.
+    peek() { // must not be called on an empty queue
+        const front = this._front;
+        const cursor = this._cursor;
+        return front._elements[cursor];
+    }
+}
+
+function ReadableStreamReaderGenericInitialize(reader, stream) {
+    reader._ownerReadableStream = stream;
+    stream._reader = reader;
+    if (stream._state === 'readable') {
+        defaultReaderClosedPromiseInitialize(reader);
+    }
+    else if (stream._state === 'closed') {
+        defaultReaderClosedPromiseInitializeAsResolved(reader);
+    }
+    else {
+        defaultReaderClosedPromiseInitializeAsRejected(reader, stream._storedError);
+    }
+}
+// A client of ReadableStreamDefaultReader and ReadableStreamBYOBReader may use these functions directly to bypass state
+// check.
+function ReadableStreamReaderGenericCancel(reader, reason) {
+    const stream = reader._ownerReadableStream;
+    return ReadableStreamCancel(stream, reason);
+}
+function ReadableStreamReaderGenericRelease(reader) {
+    if (reader._ownerReadableStream._state === 'readable') {
+        defaultReaderClosedPromiseReject(reader, new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));
+    }
+    else {
+        defaultReaderClosedPromiseResetToRejected(reader, new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));
+    }
+    reader._ownerReadableStream._reader = undefined;
+    reader._ownerReadableStream = undefined;
+}
+// Helper functions for the readers.
+function readerLockException(name) {
+    return new TypeError('Cannot ' + name + ' a stream using a released reader');
+}
+// Helper functions for the ReadableStreamDefaultReader.
+function defaultReaderClosedPromiseInitialize(reader) {
+    reader._closedPromise = newPromise((resolve, reject) => {
+        reader._closedPromise_resolve = resolve;
+        reader._closedPromise_reject = reject;
+    });
+}
+function defaultReaderClosedPromiseInitializeAsRejected(reader, reason) {
+    defaultReaderClosedPromiseInitialize(reader);
+    defaultReaderClosedPromiseReject(reader, reason);
+}
+function defaultReaderClosedPromiseInitializeAsResolved(reader) {
+    defaultReaderClosedPromiseInitialize(reader);
+    defaultReaderClosedPromiseResolve(reader);
+}
+function defaultReaderClosedPromiseReject(reader, reason) {
+    if (reader._closedPromise_reject === undefined) {
+        return;
+    }
+    setPromiseIsHandledToTrue(reader._closedPromise);
+    reader._closedPromise_reject(reason);
+    reader._closedPromise_resolve = undefined;
+    reader._closedPromise_reject = undefined;
+}
+function defaultReaderClosedPromiseResetToRejected(reader, reason) {
+    defaultReaderClosedPromiseInitializeAsRejected(reader, reason);
+}
+function defaultReaderClosedPromiseResolve(reader) {
+    if (reader._closedPromise_resolve === undefined) {
+        return;
+    }
+    reader._closedPromise_resolve(undefined);
+    reader._closedPromise_resolve = undefined;
+    reader._closedPromise_reject = undefined;
+}
+
+const AbortSteps = SymbolPolyfill('[[AbortSteps]]');
+const ErrorSteps = SymbolPolyfill('[[ErrorSteps]]');
+const CancelSteps = SymbolPolyfill('[[CancelSteps]]');
+const PullSteps = SymbolPolyfill('[[PullSteps]]');
+
+/// <reference lib="es2015.core" />
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite#Polyfill
+const NumberIsFinite = Number.isFinite || function (x) {
+    return typeof x === 'number' && isFinite(x);
+};
+
+/// <reference lib="es2015.core" />
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc#Polyfill
+const MathTrunc = Math.trunc || function (v) {
+    return v < 0 ? Math.ceil(v) : Math.floor(v);
+};
+
+// https://heycam.github.io/webidl/#idl-dictionaries
+function isDictionary(x) {
+    return typeof x === 'object' || typeof x === 'function';
+}
+function assertDictionary(obj, context) {
+    if (obj !== undefined && !isDictionary(obj)) {
+        throw new TypeError(`${context} is not an object.`);
+    }
+}
+// https://heycam.github.io/webidl/#idl-callback-functions
+function assertFunction(x, context) {
+    if (typeof x !== 'function') {
+        throw new TypeError(`${context} is not a function.`);
+    }
+}
+// https://heycam.github.io/webidl/#idl-object
+function isObject(x) {
+    return (typeof x === 'object' && x !== null) || typeof x === 'function';
+}
+function assertObject(x, context) {
+    if (!isObject(x)) {
+        throw new TypeError(`${context} is not an object.`);
+    }
+}
+function assertRequiredArgument(x, position, context) {
+    if (x === undefined) {
+        throw new TypeError(`Parameter ${position} is required in '${context}'.`);
+    }
+}
+function assertRequiredField(x, field, context) {
+    if (x === undefined) {
+        throw new TypeError(`${field} is required in '${context}'.`);
+    }
+}
+// https://heycam.github.io/webidl/#idl-unrestricted-double
+function convertUnrestrictedDouble(value) {
+    return Number(value);
+}
+function censorNegativeZero(x) {
+    return x === 0 ? 0 : x;
+}
+function integerPart(x) {
+    return censorNegativeZero(MathTrunc(x));
+}
+// https://heycam.github.io/webidl/#idl-unsigned-long-long
+function convertUnsignedLongLongWithEnforceRange(value, context) {
+    const lowerBound = 0;
+    const upperBound = Number.MAX_SAFE_INTEGER;
+    let x = Number(value);
+    x = censorNegativeZero(x);
+    if (!NumberIsFinite(x)) {
+        throw new TypeError(`${context} is not a finite number`);
+    }
+    x = integerPart(x);
+    if (x < lowerBound || x > upperBound) {
+        throw new TypeError(`${context} is outside the accepted range of ${lowerBound} to ${upperBound}, inclusive`);
+    }
+    if (!NumberIsFinite(x) || x === 0) {
+        return 0;
+    }
+    // TODO Use BigInt if supported?
+    // let xBigInt = BigInt(integerPart(x));
+    // xBigInt = BigInt.asUintN(64, xBigInt);
+    // return Number(xBigInt);
+    return x;
+}
+
+function assertReadableStream(x, context) {
+    if (!IsReadableStream(x)) {
+        throw new TypeError(`${context} is not a ReadableStream.`);
+    }
+}
+
+// Abstract operations for the ReadableStream.
+function AcquireReadableStreamDefaultReader(stream) {
+    return new ReadableStreamDefaultReader(stream);
+}
+// ReadableStream API exposed for controllers.
+function ReadableStreamAddReadRequest(stream, readRequest) {
+    stream._reader._readRequests.push(readRequest);
+}
+function ReadableStreamFulfillReadRequest(stream, chunk, done) {
+    const reader = stream._reader;
+    const readRequest = reader._readRequests.shift();
+    if (done) {
+        readRequest._closeSteps();
+    }
+    else {
+        readRequest._chunkSteps(chunk);
+    }
+}
+function ReadableStreamGetNumReadRequests(stream) {
+    return stream._reader._readRequests.length;
+}
+function ReadableStreamHasDefaultReader(stream) {
+    const reader = stream._reader;
+    if (reader === undefined) {
+        return false;
+    }
+    if (!IsReadableStreamDefaultReader(reader)) {
+        return false;
+    }
+    return true;
+}
+/**
+ * A default reader vended by a {@link ReadableStream}.
+ *
+ * @public
+ */
+class ReadableStreamDefaultReader {
+    constructor(stream) {
+        assertRequiredArgument(stream, 1, 'ReadableStreamDefaultReader');
+        assertReadableStream(stream, 'First parameter');
+        if (IsReadableStreamLocked(stream)) {
+            throw new TypeError('This stream has already been locked for exclusive reading by another reader');
+        }
+        ReadableStreamReaderGenericInitialize(this, stream);
+        this._readRequests = new SimpleQueue();
+    }
+    /**
+     * Returns a promise that will be fulfilled when the stream becomes closed,
+     * or rejected if the stream ever errors or the reader's lock is released before the stream finishes closing.
+     */
+    get closed() {
+        if (!IsReadableStreamDefaultReader(this)) {
+            return promiseRejectedWith(defaultReaderBrandCheckException('closed'));
+        }
+        return this._closedPromise;
+    }
+    /**
+     * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.
+     */
+    cancel(reason = undefined) {
+        if (!IsReadableStreamDefaultReader(this)) {
+            return promiseRejectedWith(defaultReaderBrandCheckException('cancel'));
+        }
+        if (this._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('cancel'));
+        }
+        return ReadableStreamReaderGenericCancel(this, reason);
+    }
+    /**
+     * Returns a promise that allows access to the next chunk from the stream's internal queue, if available.
+     *
+     * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.
+     */
+    read() {
+        if (!IsReadableStreamDefaultReader(this)) {
+            return promiseRejectedWith(defaultReaderBrandCheckException('read'));
+        }
+        if (this._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('read from'));
+        }
+        let resolvePromise;
+        let rejectPromise;
+        const promise = newPromise((resolve, reject) => {
+            resolvePromise = resolve;
+            rejectPromise = reject;
+        });
+        const readRequest = {
+            _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),
+            _closeSteps: () => resolvePromise({ value: undefined, done: true }),
+            _errorSteps: e => rejectPromise(e)
+        };
+        ReadableStreamDefaultReaderRead(this, readRequest);
+        return promise;
+    }
+    /**
+     * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.
+     * If the associated stream is errored when the lock is released, the reader will appear errored in the same way
+     * from now on; otherwise, the reader will appear closed.
+     *
+     * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by
+     * the reader's {@link ReadableStreamDefaultReader.read | read()} method has not yet been settled. Attempting to
+     * do so will throw a `TypeError` and leave the reader locked to the stream.
+     */
+    releaseLock() {
+        if (!IsReadableStreamDefaultReader(this)) {
+            throw defaultReaderBrandCheckException('releaseLock');
+        }
+        if (this._ownerReadableStream === undefined) {
+            return;
+        }
+        if (this._readRequests.length > 0) {
+            throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');
+        }
+        ReadableStreamReaderGenericRelease(this);
+    }
+}
+Object.defineProperties(ReadableStreamDefaultReader.prototype, {
+    cancel: { enumerable: true },
+    read: { enumerable: true },
+    releaseLock: { enumerable: true },
+    closed: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableStreamDefaultReader.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableStreamDefaultReader',
+        configurable: true
+    });
+}
+// Abstract operations for the readers.
+function IsReadableStreamDefaultReader(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_readRequests')) {
+        return false;
+    }
+    return x instanceof ReadableStreamDefaultReader;
+}
+function ReadableStreamDefaultReaderRead(reader, readRequest) {
+    const stream = reader._ownerReadableStream;
+    stream._disturbed = true;
+    if (stream._state === 'closed') {
+        readRequest._closeSteps();
+    }
+    else if (stream._state === 'errored') {
+        readRequest._errorSteps(stream._storedError);
+    }
+    else {
+        stream._readableStreamController[PullSteps](readRequest);
+    }
+}
+// Helper functions for the ReadableStreamDefaultReader.
+function defaultReaderBrandCheckException(name) {
+    return new TypeError(`ReadableStreamDefaultReader.prototype.${name} can only be used on a ReadableStreamDefaultReader`);
+}
+
+/// <reference lib="es2018.asynciterable" />
+/* eslint-disable @typescript-eslint/no-empty-function */
+const AsyncIteratorPrototype = Object.getPrototypeOf(Object.getPrototypeOf(async function* () { }).prototype);
+
+/// <reference lib="es2018.asynciterable" />
+class ReadableStreamAsyncIteratorImpl {
+    constructor(reader, preventCancel) {
+        this._ongoingPromise = undefined;
+        this._isFinished = false;
+        this._reader = reader;
+        this._preventCancel = preventCancel;
+    }
+    next() {
+        const nextSteps = () => this._nextSteps();
+        this._ongoingPromise = this._ongoingPromise ?
+            transformPromiseWith(this._ongoingPromise, nextSteps, nextSteps) :
+            nextSteps();
+        return this._ongoingPromise;
+    }
+    return(value) {
+        const returnSteps = () => this._returnSteps(value);
+        return this._ongoingPromise ?
+            transformPromiseWith(this._ongoingPromise, returnSteps, returnSteps) :
+            returnSteps();
+    }
+    _nextSteps() {
+        if (this._isFinished) {
+            return Promise.resolve({ value: undefined, done: true });
+        }
+        const reader = this._reader;
+        if (reader._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('iterate'));
+        }
+        let resolvePromise;
+        let rejectPromise;
+        const promise = newPromise((resolve, reject) => {
+            resolvePromise = resolve;
+            rejectPromise = reject;
+        });
+        const readRequest = {
+            _chunkSteps: chunk => {
+                this._ongoingPromise = undefined;
+                // This needs to be delayed by one microtask, otherwise we stop pulling too early which breaks a test.
+                // FIXME Is this a bug in the specification, or in the test?
+                queueMicrotask(() => resolvePromise({ value: chunk, done: false }));
+            },
+            _closeSteps: () => {
+                this._ongoingPromise = undefined;
+                this._isFinished = true;
+                ReadableStreamReaderGenericRelease(reader);
+                resolvePromise({ value: undefined, done: true });
+            },
+            _errorSteps: reason => {
+                this._ongoingPromise = undefined;
+                this._isFinished = true;
+                ReadableStreamReaderGenericRelease(reader);
+                rejectPromise(reason);
+            }
+        };
+        ReadableStreamDefaultReaderRead(reader, readRequest);
+        return promise;
+    }
+    _returnSteps(value) {
+        if (this._isFinished) {
+            return Promise.resolve({ value, done: true });
+        }
+        this._isFinished = true;
+        const reader = this._reader;
+        if (reader._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('finish iterating'));
+        }
+        if (!this._preventCancel) {
+            const result = ReadableStreamReaderGenericCancel(reader, value);
+            ReadableStreamReaderGenericRelease(reader);
+            return transformPromiseWith(result, () => ({ value, done: true }));
+        }
+        ReadableStreamReaderGenericRelease(reader);
+        return promiseResolvedWith({ value, done: true });
+    }
+}
+const ReadableStreamAsyncIteratorPrototype = {
+    next() {
+        if (!IsReadableStreamAsyncIterator(this)) {
+            return promiseRejectedWith(streamAsyncIteratorBrandCheckException('next'));
+        }
+        return this._asyncIteratorImpl.next();
+    },
+    return(value) {
+        if (!IsReadableStreamAsyncIterator(this)) {
+            return promiseRejectedWith(streamAsyncIteratorBrandCheckException('return'));
+        }
+        return this._asyncIteratorImpl.return(value);
+    }
+};
+if (AsyncIteratorPrototype !== undefined) {
+    Object.setPrototypeOf(ReadableStreamAsyncIteratorPrototype, AsyncIteratorPrototype);
+}
+// Abstract operations for the ReadableStream.
+function AcquireReadableStreamAsyncIterator(stream, preventCancel) {
+    const reader = AcquireReadableStreamDefaultReader(stream);
+    const impl = new ReadableStreamAsyncIteratorImpl(reader, preventCancel);
+    const iterator = Object.create(ReadableStreamAsyncIteratorPrototype);
+    iterator._asyncIteratorImpl = impl;
+    return iterator;
+}
+function IsReadableStreamAsyncIterator(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_asyncIteratorImpl')) {
+        return false;
+    }
+    try {
+        // noinspection SuspiciousTypeOfGuard
+        return x._asyncIteratorImpl instanceof
+            ReadableStreamAsyncIteratorImpl;
+    }
+    catch (_a) {
+        return false;
+    }
+}
+// Helper functions for the ReadableStream.
+function streamAsyncIteratorBrandCheckException(name) {
+    return new TypeError(`ReadableStreamAsyncIterator.${name} can only be used on a ReadableSteamAsyncIterator`);
+}
+
+/// <reference lib="es2015.core" />
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Polyfill
+const NumberIsNaN = Number.isNaN || function (x) {
+    // eslint-disable-next-line no-self-compare
+    return x !== x;
+};
+
+function CreateArrayFromList(elements) {
+    // We use arrays to represent lists, so this is basically a no-op.
+    // Do a slice though just in case we happen to depend on the unique-ness.
+    return elements.slice();
+}
+function CopyDataBlockBytes(dest, destOffset, src, srcOffset, n) {
+    new Uint8Array(dest).set(new Uint8Array(src, srcOffset, n), destOffset);
+}
+// Not implemented correctly
+function TransferArrayBuffer(O) {
+    return O;
+}
+// Not implemented correctly
+// eslint-disable-next-line @typescript-eslint/no-unused-vars
+function IsDetachedBuffer(O) {
+    return false;
+}
+function ArrayBufferSlice(buffer, begin, end) {
+    // ArrayBuffer.prototype.slice is not available on IE10
+    // https://www.caniuse.com/mdn-javascript_builtins_arraybuffer_slice
+    if (buffer.slice) {
+        return buffer.slice(begin, end);
+    }
+    const length = end - begin;
+    const slice = new ArrayBuffer(length);
+    CopyDataBlockBytes(slice, 0, buffer, begin, length);
+    return slice;
+}
+
+function IsNonNegativeNumber(v) {
+    if (typeof v !== 'number') {
+        return false;
+    }
+    if (NumberIsNaN(v)) {
+        return false;
+    }
+    if (v < 0) {
+        return false;
+    }
+    return true;
+}
+function CloneAsUint8Array(O) {
+    const buffer = ArrayBufferSlice(O.buffer, O.byteOffset, O.byteOffset + O.byteLength);
+    return new Uint8Array(buffer);
+}
+
+function DequeueValue(container) {
+    const pair = container._queue.shift();
+    container._queueTotalSize -= pair.size;
+    if (container._queueTotalSize < 0) {
+        container._queueTotalSize = 0;
+    }
+    return pair.value;
+}
+function EnqueueValueWithSize(container, value, size) {
+    if (!IsNonNegativeNumber(size) || size === Infinity) {
+        throw new RangeError('Size must be a finite, non-NaN, non-negative number.');
+    }
+    container._queue.push({ value, size });
+    container._queueTotalSize += size;
+}
+function PeekQueueValue(container) {
+    const pair = container._queue.peek();
+    return pair.value;
+}
+function ResetQueue(container) {
+    container._queue = new SimpleQueue();
+    container._queueTotalSize = 0;
+}
+
+/**
+ * A pull-into request in a {@link ReadableByteStreamController}.
+ *
+ * @public
+ */
+class ReadableStreamBYOBRequest {
+    constructor() {
+        throw new TypeError('Illegal constructor');
+    }
+    /**
+     * Returns the view for writing in to, or `null` if the BYOB request has already been responded to.
+     */
+    get view() {
+        if (!IsReadableStreamBYOBRequest(this)) {
+            throw byobRequestBrandCheckException('view');
+        }
+        return this._view;
+    }
+    respond(bytesWritten) {
+        if (!IsReadableStreamBYOBRequest(this)) {
+            throw byobRequestBrandCheckException('respond');
+        }
+        assertRequiredArgument(bytesWritten, 1, 'respond');
+        bytesWritten = convertUnsignedLongLongWithEnforceRange(bytesWritten, 'First parameter');
+        if (this._associatedReadableByteStreamController === undefined) {
+            throw new TypeError('This BYOB request has been invalidated');
+        }
+        if (IsDetachedBuffer(this._view.buffer)) ;
+        ReadableByteStreamControllerRespond(this._associatedReadableByteStreamController, bytesWritten);
+    }
+    respondWithNewView(view) {
+        if (!IsReadableStreamBYOBRequest(this)) {
+            throw byobRequestBrandCheckException('respondWithNewView');
+        }
+        assertRequiredArgument(view, 1, 'respondWithNewView');
+        if (!ArrayBuffer.isView(view)) {
+            throw new TypeError('You can only respond with array buffer views');
+        }
+        if (this._associatedReadableByteStreamController === undefined) {
+            throw new TypeError('This BYOB request has been invalidated');
+        }
+        if (IsDetachedBuffer(view.buffer)) ;
+        ReadableByteStreamControllerRespondWithNewView(this._associatedReadableByteStreamController, view);
+    }
+}
+Object.defineProperties(ReadableStreamBYOBRequest.prototype, {
+    respond: { enumerable: true },
+    respondWithNewView: { enumerable: true },
+    view: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableStreamBYOBRequest.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableStreamBYOBRequest',
+        configurable: true
+    });
+}
+/**
+ * Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue.
+ *
+ * @public
+ */
+class ReadableByteStreamController {
+    constructor() {
+        throw new TypeError('Illegal constructor');
+    }
+    /**
+     * Returns the current BYOB pull request, or `null` if there isn't one.
+     */
+    get byobRequest() {
+        if (!IsReadableByteStreamController(this)) {
+            throw byteStreamControllerBrandCheckException('byobRequest');
+        }
+        return ReadableByteStreamControllerGetBYOBRequest(this);
+    }
+    /**
+     * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is
+     * over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure.
+     */
+    get desiredSize() {
+        if (!IsReadableByteStreamController(this)) {
+            throw byteStreamControllerBrandCheckException('desiredSize');
+        }
+        return ReadableByteStreamControllerGetDesiredSize(this);
+    }
+    /**
+     * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from
+     * the stream, but once those are read, the stream will become closed.
+     */
+    close() {
+        if (!IsReadableByteStreamController(this)) {
+            throw byteStreamControllerBrandCheckException('close');
+        }
+        if (this._closeRequested) {
+            throw new TypeError('The stream has already been closed; do not close it again!');
+        }
+        const state = this._controlledReadableByteStream._state;
+        if (state !== 'readable') {
+            throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be closed`);
+        }
+        ReadableByteStreamControllerClose(this);
+    }
+    enqueue(chunk) {
+        if (!IsReadableByteStreamController(this)) {
+            throw byteStreamControllerBrandCheckException('enqueue');
+        }
+        assertRequiredArgument(chunk, 1, 'enqueue');
+        if (!ArrayBuffer.isView(chunk)) {
+            throw new TypeError('chunk must be an array buffer view');
+        }
+        if (chunk.byteLength === 0) {
+            throw new TypeError('chunk must have non-zero byteLength');
+        }
+        if (chunk.buffer.byteLength === 0) {
+            throw new TypeError(`chunk's buffer must have non-zero byteLength`);
+        }
+        if (this._closeRequested) {
+            throw new TypeError('stream is closed or draining');
+        }
+        const state = this._controlledReadableByteStream._state;
+        if (state !== 'readable') {
+            throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be enqueued to`);
+        }
+        ReadableByteStreamControllerEnqueue(this, chunk);
+    }
+    /**
+     * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.
+     */
+    error(e = undefined) {
+        if (!IsReadableByteStreamController(this)) {
+            throw byteStreamControllerBrandCheckException('error');
+        }
+        ReadableByteStreamControllerError(this, e);
+    }
+    /** @internal */
+    [CancelSteps](reason) {
+        ReadableByteStreamControllerClearPendingPullIntos(this);
+        ResetQueue(this);
+        const result = this._cancelAlgorithm(reason);
+        ReadableByteStreamControllerClearAlgorithms(this);
+        return result;
+    }
+    /** @internal */
+    [PullSteps](readRequest) {
+        const stream = this._controlledReadableByteStream;
+        if (this._queueTotalSize > 0) {
+            const entry = this._queue.shift();
+            this._queueTotalSize -= entry.byteLength;
+            ReadableByteStreamControllerHandleQueueDrain(this);
+            const view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);
+            readRequest._chunkSteps(view);
+            return;
+        }
+        const autoAllocateChunkSize = this._autoAllocateChunkSize;
+        if (autoAllocateChunkSize !== undefined) {
+            let buffer;
+            try {
+                buffer = new ArrayBuffer(autoAllocateChunkSize);
+            }
+            catch (bufferE) {
+                readRequest._errorSteps(bufferE);
+                return;
+            }
+            const pullIntoDescriptor = {
+                buffer,
+                bufferByteLength: autoAllocateChunkSize,
+                byteOffset: 0,
+                byteLength: autoAllocateChunkSize,
+                bytesFilled: 0,
+                elementSize: 1,
+                viewConstructor: Uint8Array,
+                readerType: 'default'
+            };
+            this._pendingPullIntos.push(pullIntoDescriptor);
+        }
+        ReadableStreamAddReadRequest(stream, readRequest);
+        ReadableByteStreamControllerCallPullIfNeeded(this);
+    }
+}
+Object.defineProperties(ReadableByteStreamController.prototype, {
+    close: { enumerable: true },
+    enqueue: { enumerable: true },
+    error: { enumerable: true },
+    byobRequest: { enumerable: true },
+    desiredSize: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableByteStreamController.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableByteStreamController',
+        configurable: true
+    });
+}
+// Abstract operations for the ReadableByteStreamController.
+function IsReadableByteStreamController(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableByteStream')) {
+        return false;
+    }
+    return x instanceof ReadableByteStreamController;
+}
+function IsReadableStreamBYOBRequest(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_associatedReadableByteStreamController')) {
+        return false;
+    }
+    return x instanceof ReadableStreamBYOBRequest;
+}
+function ReadableByteStreamControllerCallPullIfNeeded(controller) {
+    const shouldPull = ReadableByteStreamControllerShouldCallPull(controller);
+    if (!shouldPull) {
+        return;
+    }
+    if (controller._pulling) {
+        controller._pullAgain = true;
+        return;
+    }
+    controller._pulling = true;
+    // TODO: Test controller argument
+    const pullPromise = controller._pullAlgorithm();
+    uponPromise(pullPromise, () => {
+        controller._pulling = false;
+        if (controller._pullAgain) {
+            controller._pullAgain = false;
+            ReadableByteStreamControllerCallPullIfNeeded(controller);
+        }
+    }, e => {
+        ReadableByteStreamControllerError(controller, e);
+    });
+}
+function ReadableByteStreamControllerClearPendingPullIntos(controller) {
+    ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+    controller._pendingPullIntos = new SimpleQueue();
+}
+function ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor) {
+    let done = false;
+    if (stream._state === 'closed') {
+        done = true;
+    }
+    const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor);
+    if (pullIntoDescriptor.readerType === 'default') {
+        ReadableStreamFulfillReadRequest(stream, filledView, done);
+    }
+    else {
+        ReadableStreamFulfillReadIntoRequest(stream, filledView, done);
+    }
+}
+function ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor) {
+    const bytesFilled = pullIntoDescriptor.bytesFilled;
+    const elementSize = pullIntoDescriptor.elementSize;
+    return new pullIntoDescriptor.viewConstructor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize);
+}
+function ReadableByteStreamControllerEnqueueChunkToQueue(controller, buffer, byteOffset, byteLength) {
+    controller._queue.push({ buffer, byteOffset, byteLength });
+    controller._queueTotalSize += byteLength;
+}
+function ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor) {
+    const elementSize = pullIntoDescriptor.elementSize;
+    const currentAlignedBytes = pullIntoDescriptor.bytesFilled - pullIntoDescriptor.bytesFilled % elementSize;
+    const maxBytesToCopy = Math.min(controller._queueTotalSize, pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled);
+    const maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;
+    const maxAlignedBytes = maxBytesFilled - maxBytesFilled % elementSize;
+    let totalBytesToCopyRemaining = maxBytesToCopy;
+    let ready = false;
+    if (maxAlignedBytes > currentAlignedBytes) {
+        totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled;
+        ready = true;
+    }
+    const queue = controller._queue;
+    while (totalBytesToCopyRemaining > 0) {
+        const headOfQueue = queue.peek();
+        const bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength);
+        const destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;
+        CopyDataBlockBytes(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy);
+        if (headOfQueue.byteLength === bytesToCopy) {
+            queue.shift();
+        }
+        else {
+            headOfQueue.byteOffset += bytesToCopy;
+            headOfQueue.byteLength -= bytesToCopy;
+        }
+        controller._queueTotalSize -= bytesToCopy;
+        ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor);
+        totalBytesToCopyRemaining -= bytesToCopy;
+    }
+    return ready;
+}
+function ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, size, pullIntoDescriptor) {
+    pullIntoDescriptor.bytesFilled += size;
+}
+function ReadableByteStreamControllerHandleQueueDrain(controller) {
+    if (controller._queueTotalSize === 0 && controller._closeRequested) {
+        ReadableByteStreamControllerClearAlgorithms(controller);
+        ReadableStreamClose(controller._controlledReadableByteStream);
+    }
+    else {
+        ReadableByteStreamControllerCallPullIfNeeded(controller);
+    }
+}
+function ReadableByteStreamControllerInvalidateBYOBRequest(controller) {
+    if (controller._byobRequest === null) {
+        return;
+    }
+    controller._byobRequest._associatedReadableByteStreamController = undefined;
+    controller._byobRequest._view = null;
+    controller._byobRequest = null;
+}
+function ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller) {
+    while (controller._pendingPullIntos.length > 0) {
+        if (controller._queueTotalSize === 0) {
+            return;
+        }
+        const pullIntoDescriptor = controller._pendingPullIntos.peek();
+        if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {
+            ReadableByteStreamControllerShiftPendingPullInto(controller);
+            ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);
+        }
+    }
+}
+function ReadableByteStreamControllerPullInto(controller, view, readIntoRequest) {
+    const stream = controller._controlledReadableByteStream;
+    let elementSize = 1;
+    if (view.constructor !== DataView) {
+        elementSize = view.constructor.BYTES_PER_ELEMENT;
+    }
+    const ctor = view.constructor;
+    // try {
+    const buffer = TransferArrayBuffer(view.buffer);
+    // } catch (e) {
+    //   readIntoRequest._errorSteps(e);
+    //   return;
+    // }
+    const pullIntoDescriptor = {
+        buffer,
+        bufferByteLength: buffer.byteLength,
+        byteOffset: view.byteOffset,
+        byteLength: view.byteLength,
+        bytesFilled: 0,
+        elementSize,
+        viewConstructor: ctor,
+        readerType: 'byob'
+    };
+    if (controller._pendingPullIntos.length > 0) {
+        controller._pendingPullIntos.push(pullIntoDescriptor);
+        // No ReadableByteStreamControllerCallPullIfNeeded() call since:
+        // - No change happens on desiredSize
+        // - The source has already been notified of that there's at least 1 pending read(view)
+        ReadableStreamAddReadIntoRequest(stream, readIntoRequest);
+        return;
+    }
+    if (stream._state === 'closed') {
+        const emptyView = new ctor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0);
+        readIntoRequest._closeSteps(emptyView);
+        return;
+    }
+    if (controller._queueTotalSize > 0) {
+        if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {
+            const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor);
+            ReadableByteStreamControllerHandleQueueDrain(controller);
+            readIntoRequest._chunkSteps(filledView);
+            return;
+        }
+        if (controller._closeRequested) {
+            const e = new TypeError('Insufficient bytes to fill elements in the given buffer');
+            ReadableByteStreamControllerError(controller, e);
+            readIntoRequest._errorSteps(e);
+            return;
+        }
+    }
+    controller._pendingPullIntos.push(pullIntoDescriptor);
+    ReadableStreamAddReadIntoRequest(stream, readIntoRequest);
+    ReadableByteStreamControllerCallPullIfNeeded(controller);
+}
+function ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor) {
+    const stream = controller._controlledReadableByteStream;
+    if (ReadableStreamHasBYOBReader(stream)) {
+        while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {
+            const pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);
+            ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);
+        }
+    }
+}
+function ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, pullIntoDescriptor) {
+    ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor);
+    if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {
+        return;
+    }
+    ReadableByteStreamControllerShiftPendingPullInto(controller);
+    const remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize;
+    if (remainderSize > 0) {
+        const end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;
+        const remainder = ArrayBufferSlice(pullIntoDescriptor.buffer, end - remainderSize, end);
+        ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength);
+    }
+    pullIntoDescriptor.bytesFilled -= remainderSize;
+    ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);
+    ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);
+}
+function ReadableByteStreamControllerRespondInternal(controller, bytesWritten) {
+    const firstDescriptor = controller._pendingPullIntos.peek();
+    ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+    const state = controller._controlledReadableByteStream._state;
+    if (state === 'closed') {
+        ReadableByteStreamControllerRespondInClosedState(controller);
+    }
+    else {
+        ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);
+    }
+    ReadableByteStreamControllerCallPullIfNeeded(controller);
+}
+function ReadableByteStreamControllerShiftPendingPullInto(controller) {
+    const descriptor = controller._pendingPullIntos.shift();
+    return descriptor;
+}
+function ReadableByteStreamControllerShouldCallPull(controller) {
+    const stream = controller._controlledReadableByteStream;
+    if (stream._state !== 'readable') {
+        return false;
+    }
+    if (controller._closeRequested) {
+        return false;
+    }
+    if (!controller._started) {
+        return false;
+    }
+    if (ReadableStreamHasDefaultReader(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+        return true;
+    }
+    if (ReadableStreamHasBYOBReader(stream) && ReadableStreamGetNumReadIntoRequests(stream) > 0) {
+        return true;
+    }
+    const desiredSize = ReadableByteStreamControllerGetDesiredSize(controller);
+    if (desiredSize > 0) {
+        return true;
+    }
+    return false;
+}
+function ReadableByteStreamControllerClearAlgorithms(controller) {
+    controller._pullAlgorithm = undefined;
+    controller._cancelAlgorithm = undefined;
+}
+// A client of ReadableByteStreamController may use these functions directly to bypass state check.
+function ReadableByteStreamControllerClose(controller) {
+    const stream = controller._controlledReadableByteStream;
+    if (controller._closeRequested || stream._state !== 'readable') {
+        return;
+    }
+    if (controller._queueTotalSize > 0) {
+        controller._closeRequested = true;
+        return;
+    }
+    if (controller._pendingPullIntos.length > 0) {
+        const firstPendingPullInto = controller._pendingPullIntos.peek();
+        if (firstPendingPullInto.bytesFilled > 0) {
+            const e = new TypeError('Insufficient bytes to fill elements in the given buffer');
+            ReadableByteStreamControllerError(controller, e);
+            throw e;
+        }
+    }
+    ReadableByteStreamControllerClearAlgorithms(controller);
+    ReadableStreamClose(stream);
+}
+function ReadableByteStreamControllerEnqueue(controller, chunk) {
+    const stream = controller._controlledReadableByteStream;
+    if (controller._closeRequested || stream._state !== 'readable') {
+        return;
+    }
+    const buffer = chunk.buffer;
+    const byteOffset = chunk.byteOffset;
+    const byteLength = chunk.byteLength;
+    const transferredBuffer = TransferArrayBuffer(buffer);
+    if (controller._pendingPullIntos.length > 0) {
+        const firstPendingPullInto = controller._pendingPullIntos.peek();
+        if (IsDetachedBuffer(firstPendingPullInto.buffer)) ;
+        firstPendingPullInto.buffer = TransferArrayBuffer(firstPendingPullInto.buffer);
+    }
+    ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+    if (ReadableStreamHasDefaultReader(stream)) {
+        if (ReadableStreamGetNumReadRequests(stream) === 0) {
+            ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+        }
+        else {
+            if (controller._pendingPullIntos.length > 0) {
+                ReadableByteStreamControllerShiftPendingPullInto(controller);
+            }
+            const transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength);
+            ReadableStreamFulfillReadRequest(stream, transferredView, false);
+        }
+    }
+    else if (ReadableStreamHasBYOBReader(stream)) {
+        // TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully.
+        ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+        ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);
+    }
+    else {
+        ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+    }
+    ReadableByteStreamControllerCallPullIfNeeded(controller);
+}
+function ReadableByteStreamControllerError(controller, e) {
+    const stream = controller._controlledReadableByteStream;
+    if (stream._state !== 'readable') {
+        return;
+    }
+    ReadableByteStreamControllerClearPendingPullIntos(controller);
+    ResetQueue(controller);
+    ReadableByteStreamControllerClearAlgorithms(controller);
+    ReadableStreamError(stream, e);
+}
+function ReadableByteStreamControllerGetBYOBRequest(controller) {
+    if (controller._byobRequest === null && controller._pendingPullIntos.length > 0) {
+        const firstDescriptor = controller._pendingPullIntos.peek();
+        const view = new Uint8Array(firstDescriptor.buffer, firstDescriptor.byteOffset + firstDescriptor.bytesFilled, firstDescriptor.byteLength - firstDescriptor.bytesFilled);
+        const byobRequest = Object.create(ReadableStreamBYOBRequest.prototype);
+        SetUpReadableStreamBYOBRequest(byobRequest, controller, view);
+        controller._byobRequest = byobRequest;
+    }
+    return controller._byobRequest;
+}
+function ReadableByteStreamControllerGetDesiredSize(controller) {
+    const state = controller._controlledReadableByteStream._state;
+    if (state === 'errored') {
+        return null;
+    }
+    if (state === 'closed') {
+        return 0;
+    }
+    return controller._strategyHWM - controller._queueTotalSize;
+}
+function ReadableByteStreamControllerRespond(controller, bytesWritten) {
+    const firstDescriptor = controller._pendingPullIntos.peek();
+    const state = controller._controlledReadableByteStream._state;
+    if (state === 'closed') {
+        if (bytesWritten !== 0) {
+            throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream');
+        }
+    }
+    else {
+        if (bytesWritten === 0) {
+            throw new TypeError('bytesWritten must be greater than 0 when calling respond() on a readable stream');
+        }
+        if (firstDescriptor.bytesFilled + bytesWritten > firstDescriptor.byteLength) {
+            throw new RangeError('bytesWritten out of range');
+        }
+    }
+    firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer);
+    ReadableByteStreamControllerRespondInternal(controller, bytesWritten);
+}
+function ReadableByteStreamControllerRespondWithNewView(controller, view) {
+    const firstDescriptor = controller._pendingPullIntos.peek();
+    const state = controller._controlledReadableByteStream._state;
+    if (state === 'closed') {
+        if (view.byteLength !== 0) {
+            throw new TypeError('The view\'s length must be 0 when calling respondWithNewView() on a closed stream');
+        }
+    }
+    else {
+        if (view.byteLength === 0) {
+            throw new TypeError('The view\'s length must be greater than 0 when calling respondWithNewView() on a readable stream');
+        }
+    }
+    if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) {
+        throw new RangeError('The region specified by view does not match byobRequest');
+    }
+    if (firstDescriptor.bufferByteLength !== view.buffer.byteLength) {
+        throw new RangeError('The buffer of view has different capacity than byobRequest');
+    }
+    if (firstDescriptor.bytesFilled + view.byteLength > firstDescriptor.byteLength) {
+        throw new RangeError('The region specified by view is larger than byobRequest');
+    }
+    const viewByteLength = view.byteLength;
+    firstDescriptor.buffer = TransferArrayBuffer(view.buffer);
+    ReadableByteStreamControllerRespondInternal(controller, viewByteLength);
+}
+function SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize) {
+    controller._controlledReadableByteStream = stream;
+    controller._pullAgain = false;
+    controller._pulling = false;
+    controller._byobRequest = null;
+    // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.
+    controller._queue = controller._queueTotalSize = undefined;
+    ResetQueue(controller);
+    controller._closeRequested = false;
+    controller._started = false;
+    controller._strategyHWM = highWaterMark;
+    controller._pullAlgorithm = pullAlgorithm;
+    controller._cancelAlgorithm = cancelAlgorithm;
+    controller._autoAllocateChunkSize = autoAllocateChunkSize;
+    controller._pendingPullIntos = new SimpleQueue();
+    stream._readableStreamController = controller;
+    const startResult = startAlgorithm();
+    uponPromise(promiseResolvedWith(startResult), () => {
+        controller._started = true;
+        ReadableByteStreamControllerCallPullIfNeeded(controller);
+    }, r => {
+        ReadableByteStreamControllerError(controller, r);
+    });
+}
+function SetUpReadableByteStreamControllerFromUnderlyingSource(stream, underlyingByteSource, highWaterMark) {
+    const controller = Object.create(ReadableByteStreamController.prototype);
+    let startAlgorithm = () => undefined;
+    let pullAlgorithm = () => promiseResolvedWith(undefined);
+    let cancelAlgorithm = () => promiseResolvedWith(undefined);
+    if (underlyingByteSource.start !== undefined) {
+        startAlgorithm = () => underlyingByteSource.start(controller);
+    }
+    if (underlyingByteSource.pull !== undefined) {
+        pullAlgorithm = () => underlyingByteSource.pull(controller);
+    }
+    if (underlyingByteSource.cancel !== undefined) {
+        cancelAlgorithm = reason => underlyingByteSource.cancel(reason);
+    }
+    const autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;
+    if (autoAllocateChunkSize === 0) {
+        throw new TypeError('autoAllocateChunkSize must be greater than 0');
+    }
+    SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize);
+}
+function SetUpReadableStreamBYOBRequest(request, controller, view) {
+    request._associatedReadableByteStreamController = controller;
+    request._view = view;
+}
+// Helper functions for the ReadableStreamBYOBRequest.
+function byobRequestBrandCheckException(name) {
+    return new TypeError(`ReadableStreamBYOBRequest.prototype.${name} can only be used on a ReadableStreamBYOBRequest`);
+}
+// Helper functions for the ReadableByteStreamController.
+function byteStreamControllerBrandCheckException(name) {
+    return new TypeError(`ReadableByteStreamController.prototype.${name} can only be used on a ReadableByteStreamController`);
+}
+
+// Abstract operations for the ReadableStream.
+function AcquireReadableStreamBYOBReader(stream) {
+    return new ReadableStreamBYOBReader(stream);
+}
+// ReadableStream API exposed for controllers.
+function ReadableStreamAddReadIntoRequest(stream, readIntoRequest) {
+    stream._reader._readIntoRequests.push(readIntoRequest);
+}
+function ReadableStreamFulfillReadIntoRequest(stream, chunk, done) {
+    const reader = stream._reader;
+    const readIntoRequest = reader._readIntoRequests.shift();
+    if (done) {
+        readIntoRequest._closeSteps(chunk);
+    }
+    else {
+        readIntoRequest._chunkSteps(chunk);
+    }
+}
+function ReadableStreamGetNumReadIntoRequests(stream) {
+    return stream._reader._readIntoRequests.length;
+}
+function ReadableStreamHasBYOBReader(stream) {
+    const reader = stream._reader;
+    if (reader === undefined) {
+        return false;
+    }
+    if (!IsReadableStreamBYOBReader(reader)) {
+        return false;
+    }
+    return true;
+}
+/**
+ * A BYOB reader vended by a {@link ReadableStream}.
+ *
+ * @public
+ */
+class ReadableStreamBYOBReader {
+    constructor(stream) {
+        assertRequiredArgument(stream, 1, 'ReadableStreamBYOBReader');
+        assertReadableStream(stream, 'First parameter');
+        if (IsReadableStreamLocked(stream)) {
+            throw new TypeError('This stream has already been locked for exclusive reading by another reader');
+        }
+        if (!IsReadableByteStreamController(stream._readableStreamController)) {
+            throw new TypeError('Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte ' +
+                'source');
+        }
+        ReadableStreamReaderGenericInitialize(this, stream);
+        this._readIntoRequests = new SimpleQueue();
+    }
+    /**
+     * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or
+     * the reader's lock is released before the stream finishes closing.
+     */
+    get closed() {
+        if (!IsReadableStreamBYOBReader(this)) {
+            return promiseRejectedWith(byobReaderBrandCheckException('closed'));
+        }
+        return this._closedPromise;
+    }
+    /**
+     * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.
+     */
+    cancel(reason = undefined) {
+        if (!IsReadableStreamBYOBReader(this)) {
+            return promiseRejectedWith(byobReaderBrandCheckException('cancel'));
+        }
+        if (this._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('cancel'));
+        }
+        return ReadableStreamReaderGenericCancel(this, reason);
+    }
+    /**
+     * Attempts to reads bytes into view, and returns a promise resolved with the result.
+     *
+     * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.
+     */
+    read(view) {
+        if (!IsReadableStreamBYOBReader(this)) {
+            return promiseRejectedWith(byobReaderBrandCheckException('read'));
+        }
+        if (!ArrayBuffer.isView(view)) {
+            return promiseRejectedWith(new TypeError('view must be an array buffer view'));
+        }
+        if (view.byteLength === 0) {
+            return promiseRejectedWith(new TypeError('view must have non-zero byteLength'));
+        }
+        if (view.buffer.byteLength === 0) {
+            return promiseRejectedWith(new TypeError(`view's buffer must have non-zero byteLength`));
+        }
+        if (IsDetachedBuffer(view.buffer)) ;
+        if (this._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('read from'));
+        }
+        let resolvePromise;
+        let rejectPromise;
+        const promise = newPromise((resolve, reject) => {
+            resolvePromise = resolve;
+            rejectPromise = reject;
+        });
+        const readIntoRequest = {
+            _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),
+            _closeSteps: chunk => resolvePromise({ value: chunk, done: true }),
+            _errorSteps: e => rejectPromise(e)
+        };
+        ReadableStreamBYOBReaderRead(this, view, readIntoRequest);
+        return promise;
+    }
+    /**
+     * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.
+     * If the associated stream is errored when the lock is released, the reader will appear errored in the same way
+     * from now on; otherwise, the reader will appear closed.
+     *
+     * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by
+     * the reader's {@link ReadableStreamBYOBReader.read | read()} method has not yet been settled. Attempting to
+     * do so will throw a `TypeError` and leave the reader locked to the stream.
+     */
+    releaseLock() {
+        if (!IsReadableStreamBYOBReader(this)) {
+            throw byobReaderBrandCheckException('releaseLock');
+        }
+        if (this._ownerReadableStream === undefined) {
+            return;
+        }
+        if (this._readIntoRequests.length > 0) {
+            throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');
+        }
+        ReadableStreamReaderGenericRelease(this);
+    }
+}
+Object.defineProperties(ReadableStreamBYOBReader.prototype, {
+    cancel: { enumerable: true },
+    read: { enumerable: true },
+    releaseLock: { enumerable: true },
+    closed: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableStreamBYOBReader.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableStreamBYOBReader',
+        configurable: true
+    });
+}
+// Abstract operations for the readers.
+function IsReadableStreamBYOBReader(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_readIntoRequests')) {
+        return false;
+    }
+    return x instanceof ReadableStreamBYOBReader;
+}
+function ReadableStreamBYOBReaderRead(reader, view, readIntoRequest) {
+    const stream = reader._ownerReadableStream;
+    stream._disturbed = true;
+    if (stream._state === 'errored') {
+        readIntoRequest._errorSteps(stream._storedError);
+    }
+    else {
+        ReadableByteStreamControllerPullInto(stream._readableStreamController, view, readIntoRequest);
+    }
+}
+// Helper functions for the ReadableStreamBYOBReader.
+function byobReaderBrandCheckException(name) {
+    return new TypeError(`ReadableStreamBYOBReader.prototype.${name} can only be used on a ReadableStreamBYOBReader`);
+}
+
+function ExtractHighWaterMark(strategy, defaultHWM) {
+    const { highWaterMark } = strategy;
+    if (highWaterMark === undefined) {
+        return defaultHWM;
+    }
+    if (NumberIsNaN(highWaterMark) || highWaterMark < 0) {
+        throw new RangeError('Invalid highWaterMark');
+    }
+    return highWaterMark;
+}
+function ExtractSizeAlgorithm(strategy) {
+    const { size } = strategy;
+    if (!size) {
+        return () => 1;
+    }
+    return size;
+}
+
+function convertQueuingStrategy(init, context) {
+    assertDictionary(init, context);
+    const highWaterMark = init === null || init === void 0 ? void 0 : init.highWaterMark;
+    const size = init === null || init === void 0 ? void 0 : init.size;
+    return {
+        highWaterMark: highWaterMark === undefined ? undefined : convertUnrestrictedDouble(highWaterMark),
+        size: size === undefined ? undefined : convertQueuingStrategySize(size, `${context} has member 'size' that`)
+    };
+}
+function convertQueuingStrategySize(fn, context) {
+    assertFunction(fn, context);
+    return chunk => convertUnrestrictedDouble(fn(chunk));
+}
+
+function convertUnderlyingSink(original, context) {
+    assertDictionary(original, context);
+    const abort = original === null || original === void 0 ? void 0 : original.abort;
+    const close = original === null || original === void 0 ? void 0 : original.close;
+    const start = original === null || original === void 0 ? void 0 : original.start;
+    const type = original === null || original === void 0 ? void 0 : original.type;
+    const write = original === null || original === void 0 ? void 0 : original.write;
+    return {
+        abort: abort === undefined ?
+            undefined :
+            convertUnderlyingSinkAbortCallback(abort, original, `${context} has member 'abort' that`),
+        close: close === undefined ?
+            undefined :
+            convertUnderlyingSinkCloseCallback(close, original, `${context} has member 'close' that`),
+        start: start === undefined ?
+            undefined :
+            convertUnderlyingSinkStartCallback(start, original, `${context} has member 'start' that`),
+        write: write === undefined ?
+            undefined :
+            convertUnderlyingSinkWriteCallback(write, original, `${context} has member 'write' that`),
+        type
+    };
+}
+function convertUnderlyingSinkAbortCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (reason) => promiseCall(fn, original, [reason]);
+}
+function convertUnderlyingSinkCloseCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return () => promiseCall(fn, original, []);
+}
+function convertUnderlyingSinkStartCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (controller) => reflectCall(fn, original, [controller]);
+}
+function convertUnderlyingSinkWriteCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (chunk, controller) => promiseCall(fn, original, [chunk, controller]);
+}
+
+function assertWritableStream(x, context) {
+    if (!IsWritableStream(x)) {
+        throw new TypeError(`${context} is not a WritableStream.`);
+    }
+}
+
+function isAbortSignal(value) {
+    if (typeof value !== 'object' || value === null) {
+        return false;
+    }
+    try {
+        return typeof value.aborted === 'boolean';
+    }
+    catch (_a) {
+        // AbortSignal.prototype.aborted throws if its brand check fails
+        return false;
+    }
+}
+const supportsAbortController = typeof AbortController === 'function';
+/**
+ * Construct a new AbortController, if supported by the platform.
+ *
+ * @internal
+ */
+function createAbortController() {
+    if (supportsAbortController) {
+        return new AbortController();
+    }
+    return undefined;
+}
+
+/**
+ * A writable stream represents a destination for data, into which you can write.
+ *
+ * @public
+ */
+class WritableStream {
+    constructor(rawUnderlyingSink = {}, rawStrategy = {}) {
+        if (rawUnderlyingSink === undefined) {
+            rawUnderlyingSink = null;
+        }
+        else {
+            assertObject(rawUnderlyingSink, 'First parameter');
+        }
+        const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');
+        const underlyingSink = convertUnderlyingSink(rawUnderlyingSink, 'First parameter');
+        InitializeWritableStream(this);
+        const type = underlyingSink.type;
+        if (type !== undefined) {
+            throw new RangeError('Invalid type is specified');
+        }
+        const sizeAlgorithm = ExtractSizeAlgorithm(strategy);
+        const highWaterMark = ExtractHighWaterMark(strategy, 1);
+        SetUpWritableStreamDefaultControllerFromUnderlyingSink(this, underlyingSink, highWaterMark, sizeAlgorithm);
+    }
+    /**
+     * Returns whether or not the writable stream is locked to a writer.
+     */
+    get locked() {
+        if (!IsWritableStream(this)) {
+            throw streamBrandCheckException$2('locked');
+        }
+        return IsWritableStreamLocked(this);
+    }
+    /**
+     * Aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be
+     * immediately moved to an errored state, with any queued-up writes discarded. This will also execute any abort
+     * mechanism of the underlying sink.
+     *
+     * The returned promise will fulfill if the stream shuts down successfully, or reject if the underlying sink signaled
+     * that there was an error doing so. Additionally, it will reject with a `TypeError` (without attempting to cancel
+     * the stream) if the stream is currently locked.
+     */
+    abort(reason = undefined) {
+        if (!IsWritableStream(this)) {
+            return promiseRejectedWith(streamBrandCheckException$2('abort'));
+        }
+        if (IsWritableStreamLocked(this)) {
+            return promiseRejectedWith(new TypeError('Cannot abort a stream that already has a writer'));
+        }
+        return WritableStreamAbort(this, reason);
+    }
+    /**
+     * Closes the stream. The underlying sink will finish processing any previously-written chunks, before invoking its
+     * close behavior. During this time any further attempts to write will fail (without erroring the stream).
+     *
+     * The method returns a promise that will fulfill if all remaining chunks are successfully written and the stream
+     * successfully closes, or rejects if an error is encountered during this process. Additionally, it will reject with
+     * a `TypeError` (without attempting to cancel the stream) if the stream is currently locked.
+     */
+    close() {
+        if (!IsWritableStream(this)) {
+            return promiseRejectedWith(streamBrandCheckException$2('close'));
+        }
+        if (IsWritableStreamLocked(this)) {
+            return promiseRejectedWith(new TypeError('Cannot close a stream that already has a writer'));
+        }
+        if (WritableStreamCloseQueuedOrInFlight(this)) {
+            return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));
+        }
+        return WritableStreamClose(this);
+    }
+    /**
+     * Creates a {@link WritableStreamDefaultWriter | writer} and locks the stream to the new writer. While the stream
+     * is locked, no other writer can be acquired until this one is released.
+     *
+     * This functionality is especially useful for creating abstractions that desire the ability to write to a stream
+     * without interruption or interleaving. By getting a writer for the stream, you can ensure nobody else can write at
+     * the same time, which would cause the resulting written data to be unpredictable and probably useless.
+     */
+    getWriter() {
+        if (!IsWritableStream(this)) {
+            throw streamBrandCheckException$2('getWriter');
+        }
+        return AcquireWritableStreamDefaultWriter(this);
+    }
+}
+Object.defineProperties(WritableStream.prototype, {
+    abort: { enumerable: true },
+    close: { enumerable: true },
+    getWriter: { enumerable: true },
+    locked: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(WritableStream.prototype, SymbolPolyfill.toStringTag, {
+        value: 'WritableStream',
+        configurable: true
+    });
+}
+// Abstract operations for the WritableStream.
+function AcquireWritableStreamDefaultWriter(stream) {
+    return new WritableStreamDefaultWriter(stream);
+}
+// Throws if and only if startAlgorithm throws.
+function CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark = 1, sizeAlgorithm = () => 1) {
+    const stream = Object.create(WritableStream.prototype);
+    InitializeWritableStream(stream);
+    const controller = Object.create(WritableStreamDefaultController.prototype);
+    SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm);
+    return stream;
+}
+function InitializeWritableStream(stream) {
+    stream._state = 'writable';
+    // The error that will be reported by new method calls once the state becomes errored. Only set when [[state]] is
+    // 'erroring' or 'errored'. May be set to an undefined value.
+    stream._storedError = undefined;
+    stream._writer = undefined;
+    // Initialize to undefined first because the constructor of the controller checks this
+    // variable to validate the caller.
+    stream._writableStreamController = undefined;
+    // This queue is placed here instead of the writer class in order to allow for passing a writer to the next data
+    // producer without waiting for the queued writes to finish.
+    stream._writeRequests = new SimpleQueue();
+    // Write requests are removed from _writeRequests when write() is called on the underlying sink. This prevents
+    // them from being erroneously rejected on error. If a write() call is in-flight, the request is stored here.
+    stream._inFlightWriteRequest = undefined;
+    // The promise that was returned from writer.close(). Stored here because it may be fulfilled after the writer
+    // has been detached.
+    stream._closeRequest = undefined;
+    // Close request is removed from _closeRequest when close() is called on the underlying sink. This prevents it
+    // from being erroneously rejected on error. If a close() call is in-flight, the request is stored here.
+    stream._inFlightCloseRequest = undefined;
+    // The promise that was returned from writer.abort(). This may also be fulfilled after the writer has detached.
+    stream._pendingAbortRequest = undefined;
+    // The backpressure signal set by the controller.
+    stream._backpressure = false;
+}
+function IsWritableStream(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_writableStreamController')) {
+        return false;
+    }
+    return x instanceof WritableStream;
+}
+function IsWritableStreamLocked(stream) {
+    if (stream._writer === undefined) {
+        return false;
+    }
+    return true;
+}
+function WritableStreamAbort(stream, reason) {
+    var _a;
+    if (stream._state === 'closed' || stream._state === 'errored') {
+        return promiseResolvedWith(undefined);
+    }
+    stream._writableStreamController._abortReason = reason;
+    (_a = stream._writableStreamController._abortController) === null || _a === void 0 ? void 0 : _a.abort();
+    // TypeScript narrows the type of `stream._state` down to 'writable' | 'erroring',
+    // but it doesn't know that signaling abort runs author code that might have changed the state.
+    // Widen the type again by casting to WritableStreamState.
+    const state = stream._state;
+    if (state === 'closed' || state === 'errored') {
+        return promiseResolvedWith(undefined);
+    }
+    if (stream._pendingAbortRequest !== undefined) {
+        return stream._pendingAbortRequest._promise;
+    }
+    let wasAlreadyErroring = false;
+    if (state === 'erroring') {
+        wasAlreadyErroring = true;
+        // reason will not be used, so don't keep a reference to it.
+        reason = undefined;
+    }
+    const promise = newPromise((resolve, reject) => {
+        stream._pendingAbortRequest = {
+            _promise: undefined,
+            _resolve: resolve,
+            _reject: reject,
+            _reason: reason,
+            _wasAlreadyErroring: wasAlreadyErroring
+        };
+    });
+    stream._pendingAbortRequest._promise = promise;
+    if (!wasAlreadyErroring) {
+        WritableStreamStartErroring(stream, reason);
+    }
+    return promise;
+}
+function WritableStreamClose(stream) {
+    const state = stream._state;
+    if (state === 'closed' || state === 'errored') {
+        return promiseRejectedWith(new TypeError(`The stream (in ${state} state) is not in the writable state and cannot be closed`));
+    }
+    const promise = newPromise((resolve, reject) => {
+        const closeRequest = {
+            _resolve: resolve,
+            _reject: reject
+        };
+        stream._closeRequest = closeRequest;
+    });
+    const writer = stream._writer;
+    if (writer !== undefined && stream._backpressure && state === 'writable') {
+        defaultWriterReadyPromiseResolve(writer);
+    }
+    WritableStreamDefaultControllerClose(stream._writableStreamController);
+    return promise;
+}
+// WritableStream API exposed for controllers.
+function WritableStreamAddWriteRequest(stream) {
+    const promise = newPromise((resolve, reject) => {
+        const writeRequest = {
+            _resolve: resolve,
+            _reject: reject
+        };
+        stream._writeRequests.push(writeRequest);
+    });
+    return promise;
+}
+function WritableStreamDealWithRejection(stream, error) {
+    const state = stream._state;
+    if (state === 'writable') {
+        WritableStreamStartErroring(stream, error);
+        return;
+    }
+    WritableStreamFinishErroring(stream);
+}
+function WritableStreamStartErroring(stream, reason) {
+    const controller = stream._writableStreamController;
+    stream._state = 'erroring';
+    stream._storedError = reason;
+    const writer = stream._writer;
+    if (writer !== undefined) {
+        WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);
+    }
+    if (!WritableStreamHasOperationMarkedInFlight(stream) && controller._started) {
+        WritableStreamFinishErroring(stream);
+    }
+}
+function WritableStreamFinishErroring(stream) {
+    stream._state = 'errored';
+    stream._writableStreamController[ErrorSteps]();
+    const storedError = stream._storedError;
+    stream._writeRequests.forEach(writeRequest => {
+        writeRequest._reject(storedError);
+    });
+    stream._writeRequests = new SimpleQueue();
+    if (stream._pendingAbortRequest === undefined) {
+        WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+        return;
+    }
+    const abortRequest = stream._pendingAbortRequest;
+    stream._pendingAbortRequest = undefined;
+    if (abortRequest._wasAlreadyErroring) {
+        abortRequest._reject(storedError);
+        WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+        return;
+    }
+    const promise = stream._writableStreamController[AbortSteps](abortRequest._reason);
+    uponPromise(promise, () => {
+        abortRequest._resolve();
+        WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+    }, (reason) => {
+        abortRequest._reject(reason);
+        WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+    });
+}
+function WritableStreamFinishInFlightWrite(stream) {
+    stream._inFlightWriteRequest._resolve(undefined);
+    stream._inFlightWriteRequest = undefined;
+}
+function WritableStreamFinishInFlightWriteWithError(stream, error) {
+    stream._inFlightWriteRequest._reject(error);
+    stream._inFlightWriteRequest = undefined;
+    WritableStreamDealWithRejection(stream, error);
+}
+function WritableStreamFinishInFlightClose(stream) {
+    stream._inFlightCloseRequest._resolve(undefined);
+    stream._inFlightCloseRequest = undefined;
+    const state = stream._state;
+    if (state === 'erroring') {
+        // The error was too late to do anything, so it is ignored.
+        stream._storedError = undefined;
+        if (stream._pendingAbortRequest !== undefined) {
+            stream._pendingAbortRequest._resolve();
+            stream._pendingAbortRequest = undefined;
+        }
+    }
+    stream._state = 'closed';
+    const writer = stream._writer;
+    if (writer !== undefined) {
+        defaultWriterClosedPromiseResolve(writer);
+    }
+}
+function WritableStreamFinishInFlightCloseWithError(stream, error) {
+    stream._inFlightCloseRequest._reject(error);
+    stream._inFlightCloseRequest = undefined;
+    // Never execute sink abort() after sink close().
+    if (stream._pendingAbortRequest !== undefined) {
+        stream._pendingAbortRequest._reject(error);
+        stream._pendingAbortRequest = undefined;
+    }
+    WritableStreamDealWithRejection(stream, error);
+}
+// TODO(ricea): Fix alphabetical order.
+function WritableStreamCloseQueuedOrInFlight(stream) {
+    if (stream._closeRequest === undefined && stream._inFlightCloseRequest === undefined) {
+        return false;
+    }
+    return true;
+}
+function WritableStreamHasOperationMarkedInFlight(stream) {
+    if (stream._inFlightWriteRequest === undefined && stream._inFlightCloseRequest === undefined) {
+        return false;
+    }
+    return true;
+}
+function WritableStreamMarkCloseRequestInFlight(stream) {
+    stream._inFlightCloseRequest = stream._closeRequest;
+    stream._closeRequest = undefined;
+}
+function WritableStreamMarkFirstWriteRequestInFlight(stream) {
+    stream._inFlightWriteRequest = stream._writeRequests.shift();
+}
+function WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream) {
+    if (stream._closeRequest !== undefined) {
+        stream._closeRequest._reject(stream._storedError);
+        stream._closeRequest = undefined;
+    }
+    const writer = stream._writer;
+    if (writer !== undefined) {
+        defaultWriterClosedPromiseReject(writer, stream._storedError);
+    }
+}
+function WritableStreamUpdateBackpressure(stream, backpressure) {
+    const writer = stream._writer;
+    if (writer !== undefined && backpressure !== stream._backpressure) {
+        if (backpressure) {
+            defaultWriterReadyPromiseReset(writer);
+        }
+        else {
+            defaultWriterReadyPromiseResolve(writer);
+        }
+    }
+    stream._backpressure = backpressure;
+}
+/**
+ * A default writer vended by a {@link WritableStream}.
+ *
+ * @public
+ */
+class WritableStreamDefaultWriter {
+    constructor(stream) {
+        assertRequiredArgument(stream, 1, 'WritableStreamDefaultWriter');
+        assertWritableStream(stream, 'First parameter');
+        if (IsWritableStreamLocked(stream)) {
+            throw new TypeError('This stream has already been locked for exclusive writing by another writer');
+        }
+        this._ownerWritableStream = stream;
+        stream._writer = this;
+        const state = stream._state;
+        if (state === 'writable') {
+            if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._backpressure) {
+                defaultWriterReadyPromiseInitialize(this);
+            }
+            else {
+                defaultWriterReadyPromiseInitializeAsResolved(this);
+            }
+            defaultWriterClosedPromiseInitialize(this);
+        }
+        else if (state === 'erroring') {
+            defaultWriterReadyPromiseInitializeAsRejected(this, stream._storedError);
+            defaultWriterClosedPromiseInitialize(this);
+        }
+        else if (state === 'closed') {
+            defaultWriterReadyPromiseInitializeAsResolved(this);
+            defaultWriterClosedPromiseInitializeAsResolved(this);
+        }
+        else {
+            const storedError = stream._storedError;
+            defaultWriterReadyPromiseInitializeAsRejected(this, storedError);
+            defaultWriterClosedPromiseInitializeAsRejected(this, storedError);
+        }
+    }
+    /**
+     * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or
+     * the writer’s lock is released before the stream finishes closing.
+     */
+    get closed() {
+        if (!IsWritableStreamDefaultWriter(this)) {
+            return promiseRejectedWith(defaultWriterBrandCheckException('closed'));
+        }
+        return this._closedPromise;
+    }
+    /**
+     * Returns the desired size to fill the stream’s internal queue. It can be negative, if the queue is over-full.
+     * A producer can use this information to determine the right amount of data to write.
+     *
+     * It will be `null` if the stream cannot be successfully written to (due to either being errored, or having an abort
+     * queued up). It will return zero if the stream is closed. And the getter will throw an exception if invoked when
+     * the writer’s lock is released.
+     */
+    get desiredSize() {
+        if (!IsWritableStreamDefaultWriter(this)) {
+            throw defaultWriterBrandCheckException('desiredSize');
+        }
+        if (this._ownerWritableStream === undefined) {
+            throw defaultWriterLockException('desiredSize');
+        }
+        return WritableStreamDefaultWriterGetDesiredSize(this);
+    }
+    /**
+     * Returns a promise that will be fulfilled when the desired size to fill the stream’s internal queue transitions
+     * from non-positive to positive, signaling that it is no longer applying backpressure. Once the desired size dips
+     * back to zero or below, the getter will return a new promise that stays pending until the next transition.
+     *
+     * If the stream becomes errored or aborted, or the writer’s lock is released, the returned promise will become
+     * rejected.
+     */
+    get ready() {
+        if (!IsWritableStreamDefaultWriter(this)) {
+            return promiseRejectedWith(defaultWriterBrandCheckException('ready'));
+        }
+        return this._readyPromise;
+    }
+    /**
+     * If the reader is active, behaves the same as {@link WritableStream.abort | stream.abort(reason)}.
+     */
+    abort(reason = undefined) {
+        if (!IsWritableStreamDefaultWriter(this)) {
+            return promiseRejectedWith(defaultWriterBrandCheckException('abort'));
+        }
+        if (this._ownerWritableStream === undefined) {
+            return promiseRejectedWith(defaultWriterLockException('abort'));
+        }
+        return WritableStreamDefaultWriterAbort(this, reason);
+    }
+    /**
+     * If the reader is active, behaves the same as {@link WritableStream.close | stream.close()}.
+     */
+    close() {
+        if (!IsWritableStreamDefaultWriter(this)) {
+            return promiseRejectedWith(defaultWriterBrandCheckException('close'));
+        }
+        const stream = this._ownerWritableStream;
+        if (stream === undefined) {
+            return promiseRejectedWith(defaultWriterLockException('close'));
+        }
+        if (WritableStreamCloseQueuedOrInFlight(stream)) {
+            return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));
+        }
+        return WritableStreamDefaultWriterClose(this);
+    }
+    /**
+     * Releases the writer’s lock on the corresponding stream. After the lock is released, the writer is no longer active.
+     * If the associated stream is errored when the lock is released, the writer will appear errored in the same way from
+     * now on; otherwise, the writer will appear closed.
+     *
+     * Note that the lock can still be released even if some ongoing writes have not yet finished (i.e. even if the
+     * promises returned from previous calls to {@link WritableStreamDefaultWriter.write | write()} have not yet settled).
+     * It’s not necessary to hold the lock on the writer for the duration of the write; the lock instead simply prevents
+     * other producers from writing in an interleaved manner.
+     */
+    releaseLock() {
+        if (!IsWritableStreamDefaultWriter(this)) {
+            throw defaultWriterBrandCheckException('releaseLock');
+        }
+        const stream = this._ownerWritableStream;
+        if (stream === undefined) {
+            return;
+        }
+        WritableStreamDefaultWriterRelease(this);
+    }
+    write(chunk = undefined) {
+        if (!IsWritableStreamDefaultWriter(this)) {
+            return promiseRejectedWith(defaultWriterBrandCheckException('write'));
+        }
+        if (this._ownerWritableStream === undefined) {
+            return promiseRejectedWith(defaultWriterLockException('write to'));
+        }
+        return WritableStreamDefaultWriterWrite(this, chunk);
+    }
+}
+Object.defineProperties(WritableStreamDefaultWriter.prototype, {
+    abort: { enumerable: true },
+    close: { enumerable: true },
+    releaseLock: { enumerable: true },
+    write: { enumerable: true },
+    closed: { enumerable: true },
+    desiredSize: { enumerable: true },
+    ready: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(WritableStreamDefaultWriter.prototype, SymbolPolyfill.toStringTag, {
+        value: 'WritableStreamDefaultWriter',
+        configurable: true
+    });
+}
+// Abstract operations for the WritableStreamDefaultWriter.
+function IsWritableStreamDefaultWriter(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) {
+        return false;
+    }
+    return x instanceof WritableStreamDefaultWriter;
+}
+// A client of WritableStreamDefaultWriter may use these functions directly to bypass state check.
+function WritableStreamDefaultWriterAbort(writer, reason) {
+    const stream = writer._ownerWritableStream;
+    return WritableStreamAbort(stream, reason);
+}
+function WritableStreamDefaultWriterClose(writer) {
+    const stream = writer._ownerWritableStream;
+    return WritableStreamClose(stream);
+}
+function WritableStreamDefaultWriterCloseWithErrorPropagation(writer) {
+    const stream = writer._ownerWritableStream;
+    const state = stream._state;
+    if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {
+        return promiseResolvedWith(undefined);
+    }
+    if (state === 'errored') {
+        return promiseRejectedWith(stream._storedError);
+    }
+    return WritableStreamDefaultWriterClose(writer);
+}
+function WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, error) {
+    if (writer._closedPromiseState === 'pending') {
+        defaultWriterClosedPromiseReject(writer, error);
+    }
+    else {
+        defaultWriterClosedPromiseResetToRejected(writer, error);
+    }
+}
+function WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, error) {
+    if (writer._readyPromiseState === 'pending') {
+        defaultWriterReadyPromiseReject(writer, error);
+    }
+    else {
+        defaultWriterReadyPromiseResetToRejected(writer, error);
+    }
+}
+function WritableStreamDefaultWriterGetDesiredSize(writer) {
+    const stream = writer._ownerWritableStream;
+    const state = stream._state;
+    if (state === 'errored' || state === 'erroring') {
+        return null;
+    }
+    if (state === 'closed') {
+        return 0;
+    }
+    return WritableStreamDefaultControllerGetDesiredSize(stream._writableStreamController);
+}
+function WritableStreamDefaultWriterRelease(writer) {
+    const stream = writer._ownerWritableStream;
+    const releasedError = new TypeError(`Writer was released and can no longer be used to monitor the stream's closedness`);
+    WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, releasedError);
+    // The state transitions to "errored" before the sink abort() method runs, but the writer.closed promise is not
+    // rejected until afterwards. This means that simply testing state will not work.
+    WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, releasedError);
+    stream._writer = undefined;
+    writer._ownerWritableStream = undefined;
+}
+function WritableStreamDefaultWriterWrite(writer, chunk) {
+    const stream = writer._ownerWritableStream;
+    const controller = stream._writableStreamController;
+    const chunkSize = WritableStreamDefaultControllerGetChunkSize(controller, chunk);
+    if (stream !== writer._ownerWritableStream) {
+        return promiseRejectedWith(defaultWriterLockException('write to'));
+    }
+    const state = stream._state;
+    if (state === 'errored') {
+        return promiseRejectedWith(stream._storedError);
+    }
+    if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {
+        return promiseRejectedWith(new TypeError('The stream is closing or closed and cannot be written to'));
+    }
+    if (state === 'erroring') {
+        return promiseRejectedWith(stream._storedError);
+    }
+    const promise = WritableStreamAddWriteRequest(stream);
+    WritableStreamDefaultControllerWrite(controller, chunk, chunkSize);
+    return promise;
+}
+const closeSentinel = {};
+/**
+ * Allows control of a {@link WritableStream | writable stream}'s state and internal queue.
+ *
+ * @public
+ */
+class WritableStreamDefaultController {
+    constructor() {
+        throw new TypeError('Illegal constructor');
+    }
+    /**
+     * The reason which was passed to `WritableStream.abort(reason)` when the stream was aborted.
+     *
+     * @deprecated
+     *  This property has been removed from the specification, see https://github.com/whatwg/streams/pull/1177.
+     *  Use {@link WritableStreamDefaultController.signal}'s `reason` instead.
+     */
+    get abortReason() {
+        if (!IsWritableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$2('abortReason');
+        }
+        return this._abortReason;
+    }
+    /**
+     * An `AbortSignal` that can be used to abort the pending write or close operation when the stream is aborted.
+     */
+    get signal() {
+        if (!IsWritableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$2('signal');
+        }
+        if (this._abortController === undefined) {
+            // Older browsers or older Node versions may not support `AbortController` or `AbortSignal`.
+            // We don't want to bundle and ship an `AbortController` polyfill together with our polyfill,
+            // so instead we only implement support for `signal` if we find a global `AbortController` constructor.
+            throw new TypeError('WritableStreamDefaultController.prototype.signal is not supported');
+        }
+        return this._abortController.signal;
+    }
+    /**
+     * Closes the controlled writable stream, making all future interactions with it fail with the given error `e`.
+     *
+     * This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying
+     * sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the
+     * normal lifecycle of interactions with the underlying sink.
+     */
+    error(e = undefined) {
+        if (!IsWritableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$2('error');
+        }
+        const state = this._controlledWritableStream._state;
+        if (state !== 'writable') {
+            // The stream is closed, errored or will be soon. The sink can't do anything useful if it gets an error here, so
+            // just treat it as a no-op.
+            return;
+        }
+        WritableStreamDefaultControllerError(this, e);
+    }
+    /** @internal */
+    [AbortSteps](reason) {
+        const result = this._abortAlgorithm(reason);
+        WritableStreamDefaultControllerClearAlgorithms(this);
+        return result;
+    }
+    /** @internal */
+    [ErrorSteps]() {
+        ResetQueue(this);
+    }
+}
+Object.defineProperties(WritableStreamDefaultController.prototype, {
+    abortReason: { enumerable: true },
+    signal: { enumerable: true },
+    error: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(WritableStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+        value: 'WritableStreamDefaultController',
+        configurable: true
+    });
+}
+// Abstract operations implementing interface required by the WritableStream.
+function IsWritableStreamDefaultController(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_controlledWritableStream')) {
+        return false;
+    }
+    return x instanceof WritableStreamDefaultController;
+}
+function SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm) {
+    controller._controlledWritableStream = stream;
+    stream._writableStreamController = controller;
+    // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.
+    controller._queue = undefined;
+    controller._queueTotalSize = undefined;
+    ResetQueue(controller);
+    controller._abortReason = undefined;
+    controller._abortController = createAbortController();
+    controller._started = false;
+    controller._strategySizeAlgorithm = sizeAlgorithm;
+    controller._strategyHWM = highWaterMark;
+    controller._writeAlgorithm = writeAlgorithm;
+    controller._closeAlgorithm = closeAlgorithm;
+    controller._abortAlgorithm = abortAlgorithm;
+    const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+    WritableStreamUpdateBackpressure(stream, backpressure);
+    const startResult = startAlgorithm();
+    const startPromise = promiseResolvedWith(startResult);
+    uponPromise(startPromise, () => {
+        controller._started = true;
+        WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+    }, r => {
+        controller._started = true;
+        WritableStreamDealWithRejection(stream, r);
+    });
+}
+function SetUpWritableStreamDefaultControllerFromUnderlyingSink(stream, underlyingSink, highWaterMark, sizeAlgorithm) {
+    const controller = Object.create(WritableStreamDefaultController.prototype);
+    let startAlgorithm = () => undefined;
+    let writeAlgorithm = () => promiseResolvedWith(undefined);
+    let closeAlgorithm = () => promiseResolvedWith(undefined);
+    let abortAlgorithm = () => promiseResolvedWith(undefined);
+    if (underlyingSink.start !== undefined) {
+        startAlgorithm = () => underlyingSink.start(controller);
+    }
+    if (underlyingSink.write !== undefined) {
+        writeAlgorithm = chunk => underlyingSink.write(chunk, controller);
+    }
+    if (underlyingSink.close !== undefined) {
+        closeAlgorithm = () => underlyingSink.close();
+    }
+    if (underlyingSink.abort !== undefined) {
+        abortAlgorithm = reason => underlyingSink.abort(reason);
+    }
+    SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm);
+}
+// ClearAlgorithms may be called twice. Erroring the same stream in multiple ways will often result in redundant calls.
+function WritableStreamDefaultControllerClearAlgorithms(controller) {
+    controller._writeAlgorithm = undefined;
+    controller._closeAlgorithm = undefined;
+    controller._abortAlgorithm = undefined;
+    controller._strategySizeAlgorithm = undefined;
+}
+function WritableStreamDefaultControllerClose(controller) {
+    EnqueueValueWithSize(controller, closeSentinel, 0);
+    WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+}
+function WritableStreamDefaultControllerGetChunkSize(controller, chunk) {
+    try {
+        return controller._strategySizeAlgorithm(chunk);
+    }
+    catch (chunkSizeE) {
+        WritableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE);
+        return 1;
+    }
+}
+function WritableStreamDefaultControllerGetDesiredSize(controller) {
+    return controller._strategyHWM - controller._queueTotalSize;
+}
+function WritableStreamDefaultControllerWrite(controller, chunk, chunkSize) {
+    try {
+        EnqueueValueWithSize(controller, chunk, chunkSize);
+    }
+    catch (enqueueE) {
+        WritableStreamDefaultControllerErrorIfNeeded(controller, enqueueE);
+        return;
+    }
+    const stream = controller._controlledWritableStream;
+    if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._state === 'writable') {
+        const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+        WritableStreamUpdateBackpressure(stream, backpressure);
+    }
+    WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+}
+// Abstract operations for the WritableStreamDefaultController.
+function WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller) {
+    const stream = controller._controlledWritableStream;
+    if (!controller._started) {
+        return;
+    }
+    if (stream._inFlightWriteRequest !== undefined) {
+        return;
+    }
+    const state = stream._state;
+    if (state === 'erroring') {
+        WritableStreamFinishErroring(stream);
+        return;
+    }
+    if (controller._queue.length === 0) {
+        return;
+    }
+    const value = PeekQueueValue(controller);
+    if (value === closeSentinel) {
+        WritableStreamDefaultControllerProcessClose(controller);
+    }
+    else {
+        WritableStreamDefaultControllerProcessWrite(controller, value);
+    }
+}
+function WritableStreamDefaultControllerErrorIfNeeded(controller, error) {
+    if (controller._controlledWritableStream._state === 'writable') {
+        WritableStreamDefaultControllerError(controller, error);
+    }
+}
+function WritableStreamDefaultControllerProcessClose(controller) {
+    const stream = controller._controlledWritableStream;
+    WritableStreamMarkCloseRequestInFlight(stream);
+    DequeueValue(controller);
+    const sinkClosePromise = controller._closeAlgorithm();
+    WritableStreamDefaultControllerClearAlgorithms(controller);
+    uponPromise(sinkClosePromise, () => {
+        WritableStreamFinishInFlightClose(stream);
+    }, reason => {
+        WritableStreamFinishInFlightCloseWithError(stream, reason);
+    });
+}
+function WritableStreamDefaultControllerProcessWrite(controller, chunk) {
+    const stream = controller._controlledWritableStream;
+    WritableStreamMarkFirstWriteRequestInFlight(stream);
+    const sinkWritePromise = controller._writeAlgorithm(chunk);
+    uponPromise(sinkWritePromise, () => {
+        WritableStreamFinishInFlightWrite(stream);
+        const state = stream._state;
+        DequeueValue(controller);
+        if (!WritableStreamCloseQueuedOrInFlight(stream) && state === 'writable') {
+            const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+            WritableStreamUpdateBackpressure(stream, backpressure);
+        }
+        WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+    }, reason => {
+        if (stream._state === 'writable') {
+            WritableStreamDefaultControllerClearAlgorithms(controller);
+        }
+        WritableStreamFinishInFlightWriteWithError(stream, reason);
+    });
+}
+function WritableStreamDefaultControllerGetBackpressure(controller) {
+    const desiredSize = WritableStreamDefaultControllerGetDesiredSize(controller);
+    return desiredSize <= 0;
+}
+// A client of WritableStreamDefaultController may use these functions directly to bypass state check.
+function WritableStreamDefaultControllerError(controller, error) {
+    const stream = controller._controlledWritableStream;
+    WritableStreamDefaultControllerClearAlgorithms(controller);
+    WritableStreamStartErroring(stream, error);
+}
+// Helper functions for the WritableStream.
+function streamBrandCheckException$2(name) {
+    return new TypeError(`WritableStream.prototype.${name} can only be used on a WritableStream`);
+}
+// Helper functions for the WritableStreamDefaultController.
+function defaultControllerBrandCheckException$2(name) {
+    return new TypeError(`WritableStreamDefaultController.prototype.${name} can only be used on a WritableStreamDefaultController`);
+}
+// Helper functions for the WritableStreamDefaultWriter.
+function defaultWriterBrandCheckException(name) {
+    return new TypeError(`WritableStreamDefaultWriter.prototype.${name} can only be used on a WritableStreamDefaultWriter`);
+}
+function defaultWriterLockException(name) {
+    return new TypeError('Cannot ' + name + ' a stream using a released writer');
+}
+function defaultWriterClosedPromiseInitialize(writer) {
+    writer._closedPromise = newPromise((resolve, reject) => {
+        writer._closedPromise_resolve = resolve;
+        writer._closedPromise_reject = reject;
+        writer._closedPromiseState = 'pending';
+    });
+}
+function defaultWriterClosedPromiseInitializeAsRejected(writer, reason) {
+    defaultWriterClosedPromiseInitialize(writer);
+    defaultWriterClosedPromiseReject(writer, reason);
+}
+function defaultWriterClosedPromiseInitializeAsResolved(writer) {
+    defaultWriterClosedPromiseInitialize(writer);
+    defaultWriterClosedPromiseResolve(writer);
+}
+function defaultWriterClosedPromiseReject(writer, reason) {
+    if (writer._closedPromise_reject === undefined) {
+        return;
+    }
+    setPromiseIsHandledToTrue(writer._closedPromise);
+    writer._closedPromise_reject(reason);
+    writer._closedPromise_resolve = undefined;
+    writer._closedPromise_reject = undefined;
+    writer._closedPromiseState = 'rejected';
+}
+function defaultWriterClosedPromiseResetToRejected(writer, reason) {
+    defaultWriterClosedPromiseInitializeAsRejected(writer, reason);
+}
+function defaultWriterClosedPromiseResolve(writer) {
+    if (writer._closedPromise_resolve === undefined) {
+        return;
+    }
+    writer._closedPromise_resolve(undefined);
+    writer._closedPromise_resolve = undefined;
+    writer._closedPromise_reject = undefined;
+    writer._closedPromiseState = 'resolved';
+}
+function defaultWriterReadyPromiseInitialize(writer) {
+    writer._readyPromise = newPromise((resolve, reject) => {
+        writer._readyPromise_resolve = resolve;
+        writer._readyPromise_reject = reject;
+    });
+    writer._readyPromiseState = 'pending';
+}
+function defaultWriterReadyPromiseInitializeAsRejected(writer, reason) {
+    defaultWriterReadyPromiseInitialize(writer);
+    defaultWriterReadyPromiseReject(writer, reason);
+}
+function defaultWriterReadyPromiseInitializeAsResolved(writer) {
+    defaultWriterReadyPromiseInitialize(writer);
+    defaultWriterReadyPromiseResolve(writer);
+}
+function defaultWriterReadyPromiseReject(writer, reason) {
+    if (writer._readyPromise_reject === undefined) {
+        return;
+    }
+    setPromiseIsHandledToTrue(writer._readyPromise);
+    writer._readyPromise_reject(reason);
+    writer._readyPromise_resolve = undefined;
+    writer._readyPromise_reject = undefined;
+    writer._readyPromiseState = 'rejected';
+}
+function defaultWriterReadyPromiseReset(writer) {
+    defaultWriterReadyPromiseInitialize(writer);
+}
+function defaultWriterReadyPromiseResetToRejected(writer, reason) {
+    defaultWriterReadyPromiseInitializeAsRejected(writer, reason);
+}
+function defaultWriterReadyPromiseResolve(writer) {
+    if (writer._readyPromise_resolve === undefined) {
+        return;
+    }
+    writer._readyPromise_resolve(undefined);
+    writer._readyPromise_resolve = undefined;
+    writer._readyPromise_reject = undefined;
+    writer._readyPromiseState = 'fulfilled';
+}
+
+/// <reference lib="dom" />
+const NativeDOMException = typeof DOMException !== 'undefined' ? DOMException : undefined;
+
+/// <reference types="node" />
+function isDOMExceptionConstructor(ctor) {
+    if (!(typeof ctor === 'function' || typeof ctor === 'object')) {
+        return false;
+    }
+    try {
+        new ctor();
+        return true;
+    }
+    catch (_a) {
+        return false;
+    }
+}
+function createDOMExceptionPolyfill() {
+    // eslint-disable-next-line no-shadow
+    const ctor = function DOMException(message, name) {
+        this.message = message || '';
+        this.name = name || 'Error';
+        if (Error.captureStackTrace) {
+            Error.captureStackTrace(this, this.constructor);
+        }
+    };
+    ctor.prototype = Object.create(Error.prototype);
+    Object.defineProperty(ctor.prototype, 'constructor', { value: ctor, writable: true, configurable: true });
+    return ctor;
+}
+// eslint-disable-next-line no-redeclare
+const DOMException$1 = isDOMExceptionConstructor(NativeDOMException) ? NativeDOMException : createDOMExceptionPolyfill();
+
+function ReadableStreamPipeTo(source, dest, preventClose, preventAbort, preventCancel, signal) {
+    const reader = AcquireReadableStreamDefaultReader(source);
+    const writer = AcquireWritableStreamDefaultWriter(dest);
+    source._disturbed = true;
+    let shuttingDown = false;
+    // This is used to keep track of the spec's requirement that we wait for ongoing writes during shutdown.
+    let currentWrite = promiseResolvedWith(undefined);
+    return newPromise((resolve, reject) => {
+        let abortAlgorithm;
+        if (signal !== undefined) {
+            abortAlgorithm = () => {
+                const error = new DOMException$1('Aborted', 'AbortError');
+                const actions = [];
+                if (!preventAbort) {
+                    actions.push(() => {
+                        if (dest._state === 'writable') {
+                            return WritableStreamAbort(dest, error);
+                        }
+                        return promiseResolvedWith(undefined);
+                    });
+                }
+                if (!preventCancel) {
+                    actions.push(() => {
+                        if (source._state === 'readable') {
+                            return ReadableStreamCancel(source, error);
+                        }
+                        return promiseResolvedWith(undefined);
+                    });
+                }
+                shutdownWithAction(() => Promise.all(actions.map(action => action())), true, error);
+            };
+            if (signal.aborted) {
+                abortAlgorithm();
+                return;
+            }
+            signal.addEventListener('abort', abortAlgorithm);
+        }
+        // Using reader and writer, read all chunks from this and write them to dest
+        // - Backpressure must be enforced
+        // - Shutdown must stop all activity
+        function pipeLoop() {
+            return newPromise((resolveLoop, rejectLoop) => {
+                function next(done) {
+                    if (done) {
+                        resolveLoop();
+                    }
+                    else {
+                        // Use `PerformPromiseThen` instead of `uponPromise` to avoid
+                        // adding unnecessary `.catch(rethrowAssertionErrorRejection)` handlers
+                        PerformPromiseThen(pipeStep(), next, rejectLoop);
+                    }
+                }
+                next(false);
+            });
+        }
+        function pipeStep() {
+            if (shuttingDown) {
+                return promiseResolvedWith(true);
+            }
+            return PerformPromiseThen(writer._readyPromise, () => {
+                return newPromise((resolveRead, rejectRead) => {
+                    ReadableStreamDefaultReaderRead(reader, {
+                        _chunkSteps: chunk => {
+                            currentWrite = PerformPromiseThen(WritableStreamDefaultWriterWrite(writer, chunk), undefined, noop);
+                            resolveRead(false);
+                        },
+                        _closeSteps: () => resolveRead(true),
+                        _errorSteps: rejectRead
+                    });
+                });
+            });
+        }
+        // Errors must be propagated forward
+        isOrBecomesErrored(source, reader._closedPromise, storedError => {
+            if (!preventAbort) {
+                shutdownWithAction(() => WritableStreamAbort(dest, storedError), true, storedError);
+            }
+            else {
+                shutdown(true, storedError);
+            }
+        });
+        // Errors must be propagated backward
+        isOrBecomesErrored(dest, writer._closedPromise, storedError => {
+            if (!preventCancel) {
+                shutdownWithAction(() => ReadableStreamCancel(source, storedError), true, storedError);
+            }
+            else {
+                shutdown(true, storedError);
+            }
+        });
+        // Closing must be propagated forward
+        isOrBecomesClosed(source, reader._closedPromise, () => {
+            if (!preventClose) {
+                shutdownWithAction(() => WritableStreamDefaultWriterCloseWithErrorPropagation(writer));
+            }
+            else {
+                shutdown();
+            }
+        });
+        // Closing must be propagated backward
+        if (WritableStreamCloseQueuedOrInFlight(dest) || dest._state === 'closed') {
+            const destClosed = new TypeError('the destination writable stream closed before all data could be piped to it');
+            if (!preventCancel) {
+                shutdownWithAction(() => ReadableStreamCancel(source, destClosed), true, destClosed);
+            }
+            else {
+                shutdown(true, destClosed);
+            }
+        }
+        setPromiseIsHandledToTrue(pipeLoop());
+        function waitForWritesToFinish() {
+            // Another write may have started while we were waiting on this currentWrite, so we have to be sure to wait
+            // for that too.
+            const oldCurrentWrite = currentWrite;
+            return PerformPromiseThen(currentWrite, () => oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined);
+        }
+        function isOrBecomesErrored(stream, promise, action) {
+            if (stream._state === 'errored') {
+                action(stream._storedError);
+            }
+            else {
+                uponRejection(promise, action);
+            }
+        }
+        function isOrBecomesClosed(stream, promise, action) {
+            if (stream._state === 'closed') {
+                action();
+            }
+            else {
+                uponFulfillment(promise, action);
+            }
+        }
+        function shutdownWithAction(action, originalIsError, originalError) {
+            if (shuttingDown) {
+                return;
+            }
+            shuttingDown = true;
+            if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {
+                uponFulfillment(waitForWritesToFinish(), doTheRest);
+            }
+            else {
+                doTheRest();
+            }
+            function doTheRest() {
+                uponPromise(action(), () => finalize(originalIsError, originalError), newError => finalize(true, newError));
+            }
+        }
+        function shutdown(isError, error) {
+            if (shuttingDown) {
+                return;
+            }
+            shuttingDown = true;
+            if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {
+                uponFulfillment(waitForWritesToFinish(), () => finalize(isError, error));
+            }
+            else {
+                finalize(isError, error);
+            }
+        }
+        function finalize(isError, error) {
+            WritableStreamDefaultWriterRelease(writer);
+            ReadableStreamReaderGenericRelease(reader);
+            if (signal !== undefined) {
+                signal.removeEventListener('abort', abortAlgorithm);
+            }
+            if (isError) {
+                reject(error);
+            }
+            else {
+                resolve(undefined);
+            }
+        }
+    });
+}
+
+/**
+ * Allows control of a {@link ReadableStream | readable stream}'s state and internal queue.
+ *
+ * @public
+ */
+class ReadableStreamDefaultController {
+    constructor() {
+        throw new TypeError('Illegal constructor');
+    }
+    /**
+     * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is
+     * over-full. An underlying source ought to use this information to determine when and how to apply backpressure.
+     */
+    get desiredSize() {
+        if (!IsReadableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$1('desiredSize');
+        }
+        return ReadableStreamDefaultControllerGetDesiredSize(this);
+    }
+    /**
+     * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from
+     * the stream, but once those are read, the stream will become closed.
+     */
+    close() {
+        if (!IsReadableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$1('close');
+        }
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {
+            throw new TypeError('The stream is not in a state that permits close');
+        }
+        ReadableStreamDefaultControllerClose(this);
+    }
+    enqueue(chunk = undefined) {
+        if (!IsReadableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$1('enqueue');
+        }
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {
+            throw new TypeError('The stream is not in a state that permits enqueue');
+        }
+        return ReadableStreamDefaultControllerEnqueue(this, chunk);
+    }
+    /**
+     * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.
+     */
+    error(e = undefined) {
+        if (!IsReadableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$1('error');
+        }
+        ReadableStreamDefaultControllerError(this, e);
+    }
+    /** @internal */
+    [CancelSteps](reason) {
+        ResetQueue(this);
+        const result = this._cancelAlgorithm(reason);
+        ReadableStreamDefaultControllerClearAlgorithms(this);
+        return result;
+    }
+    /** @internal */
+    [PullSteps](readRequest) {
+        const stream = this._controlledReadableStream;
+        if (this._queue.length > 0) {
+            const chunk = DequeueValue(this);
+            if (this._closeRequested && this._queue.length === 0) {
+                ReadableStreamDefaultControllerClearAlgorithms(this);
+                ReadableStreamClose(stream);
+            }
+            else {
+                ReadableStreamDefaultControllerCallPullIfNeeded(this);
+            }
+            readRequest._chunkSteps(chunk);
+        }
+        else {
+            ReadableStreamAddReadRequest(stream, readRequest);
+            ReadableStreamDefaultControllerCallPullIfNeeded(this);
+        }
+    }
+}
+Object.defineProperties(ReadableStreamDefaultController.prototype, {
+    close: { enumerable: true },
+    enqueue: { enumerable: true },
+    error: { enumerable: true },
+    desiredSize: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableStreamDefaultController',
+        configurable: true
+    });
+}
+// Abstract operations for the ReadableStreamDefaultController.
+function IsReadableStreamDefaultController(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableStream')) {
+        return false;
+    }
+    return x instanceof ReadableStreamDefaultController;
+}
+function ReadableStreamDefaultControllerCallPullIfNeeded(controller) {
+    const shouldPull = ReadableStreamDefaultControllerShouldCallPull(controller);
+    if (!shouldPull) {
+        return;
+    }
+    if (controller._pulling) {
+        controller._pullAgain = true;
+        return;
+    }
+    controller._pulling = true;
+    const pullPromise = controller._pullAlgorithm();
+    uponPromise(pullPromise, () => {
+        controller._pulling = false;
+        if (controller._pullAgain) {
+            controller._pullAgain = false;
+            ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+        }
+    }, e => {
+        ReadableStreamDefaultControllerError(controller, e);
+    });
+}
+function ReadableStreamDefaultControllerShouldCallPull(controller) {
+    const stream = controller._controlledReadableStream;
+    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+        return false;
+    }
+    if (!controller._started) {
+        return false;
+    }
+    if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+        return true;
+    }
+    const desiredSize = ReadableStreamDefaultControllerGetDesiredSize(controller);
+    if (desiredSize > 0) {
+        return true;
+    }
+    return false;
+}
+function ReadableStreamDefaultControllerClearAlgorithms(controller) {
+    controller._pullAlgorithm = undefined;
+    controller._cancelAlgorithm = undefined;
+    controller._strategySizeAlgorithm = undefined;
+}
+// A client of ReadableStreamDefaultController may use these functions directly to bypass state check.
+function ReadableStreamDefaultControllerClose(controller) {
+    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+        return;
+    }
+    const stream = controller._controlledReadableStream;
+    controller._closeRequested = true;
+    if (controller._queue.length === 0) {
+        ReadableStreamDefaultControllerClearAlgorithms(controller);
+        ReadableStreamClose(stream);
+    }
+}
+function ReadableStreamDefaultControllerEnqueue(controller, chunk) {
+    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+        return;
+    }
+    const stream = controller._controlledReadableStream;
+    if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+        ReadableStreamFulfillReadRequest(stream, chunk, false);
+    }
+    else {
+        let chunkSize;
+        try {
+            chunkSize = controller._strategySizeAlgorithm(chunk);
+        }
+        catch (chunkSizeE) {
+            ReadableStreamDefaultControllerError(controller, chunkSizeE);
+            throw chunkSizeE;
+        }
+        try {
+            EnqueueValueWithSize(controller, chunk, chunkSize);
+        }
+        catch (enqueueE) {
+            ReadableStreamDefaultControllerError(controller, enqueueE);
+            throw enqueueE;
+        }
+    }
+    ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+}
+function ReadableStreamDefaultControllerError(controller, e) {
+    const stream = controller._controlledReadableStream;
+    if (stream._state !== 'readable') {
+        return;
+    }
+    ResetQueue(controller);
+    ReadableStreamDefaultControllerClearAlgorithms(controller);
+    ReadableStreamError(stream, e);
+}
+function ReadableStreamDefaultControllerGetDesiredSize(controller) {
+    const state = controller._controlledReadableStream._state;
+    if (state === 'errored') {
+        return null;
+    }
+    if (state === 'closed') {
+        return 0;
+    }
+    return controller._strategyHWM - controller._queueTotalSize;
+}
+// This is used in the implementation of TransformStream.
+function ReadableStreamDefaultControllerHasBackpressure(controller) {
+    if (ReadableStreamDefaultControllerShouldCallPull(controller)) {
+        return false;
+    }
+    return true;
+}
+function ReadableStreamDefaultControllerCanCloseOrEnqueue(controller) {
+    const state = controller._controlledReadableStream._state;
+    if (!controller._closeRequested && state === 'readable') {
+        return true;
+    }
+    return false;
+}
+function SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm) {
+    controller._controlledReadableStream = stream;
+    controller._queue = undefined;
+    controller._queueTotalSize = undefined;
+    ResetQueue(controller);
+    controller._started = false;
+    controller._closeRequested = false;
+    controller._pullAgain = false;
+    controller._pulling = false;
+    controller._strategySizeAlgorithm = sizeAlgorithm;
+    controller._strategyHWM = highWaterMark;
+    controller._pullAlgorithm = pullAlgorithm;
+    controller._cancelAlgorithm = cancelAlgorithm;
+    stream._readableStreamController = controller;
+    const startResult = startAlgorithm();
+    uponPromise(promiseResolvedWith(startResult), () => {
+        controller._started = true;
+        ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+    }, r => {
+        ReadableStreamDefaultControllerError(controller, r);
+    });
+}
+function SetUpReadableStreamDefaultControllerFromUnderlyingSource(stream, underlyingSource, highWaterMark, sizeAlgorithm) {
+    const controller = Object.create(ReadableStreamDefaultController.prototype);
+    let startAlgorithm = () => undefined;
+    let pullAlgorithm = () => promiseResolvedWith(undefined);
+    let cancelAlgorithm = () => promiseResolvedWith(undefined);
+    if (underlyingSource.start !== undefined) {
+        startAlgorithm = () => underlyingSource.start(controller);
+    }
+    if (underlyingSource.pull !== undefined) {
+        pullAlgorithm = () => underlyingSource.pull(controller);
+    }
+    if (underlyingSource.cancel !== undefined) {
+        cancelAlgorithm = reason => underlyingSource.cancel(reason);
+    }
+    SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm);
+}
+// Helper functions for the ReadableStreamDefaultController.
+function defaultControllerBrandCheckException$1(name) {
+    return new TypeError(`ReadableStreamDefaultController.prototype.${name} can only be used on a ReadableStreamDefaultController`);
+}
+
+function ReadableStreamTee(stream, cloneForBranch2) {
+    if (IsReadableByteStreamController(stream._readableStreamController)) {
+        return ReadableByteStreamTee(stream);
+    }
+    return ReadableStreamDefaultTee(stream);
+}
+function ReadableStreamDefaultTee(stream, cloneForBranch2) {
+    const reader = AcquireReadableStreamDefaultReader(stream);
+    let reading = false;
+    let readAgain = false;
+    let canceled1 = false;
+    let canceled2 = false;
+    let reason1;
+    let reason2;
+    let branch1;
+    let branch2;
+    let resolveCancelPromise;
+    const cancelPromise = newPromise(resolve => {
+        resolveCancelPromise = resolve;
+    });
+    function pullAlgorithm() {
+        if (reading) {
+            readAgain = true;
+            return promiseResolvedWith(undefined);
+        }
+        reading = true;
+        const readRequest = {
+            _chunkSteps: chunk => {
+                // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                // successful synchronously-available reads get ahead of asynchronously-available errors.
+                queueMicrotask(() => {
+                    readAgain = false;
+                    const chunk1 = chunk;
+                    const chunk2 = chunk;
+                    // There is no way to access the cloning code right now in the reference implementation.
+                    // If we add one then we'll need an implementation for serializable objects.
+                    // if (!canceled2 && cloneForBranch2) {
+                    //   chunk2 = StructuredDeserialize(StructuredSerialize(chunk2));
+                    // }
+                    if (!canceled1) {
+                        ReadableStreamDefaultControllerEnqueue(branch1._readableStreamController, chunk1);
+                    }
+                    if (!canceled2) {
+                        ReadableStreamDefaultControllerEnqueue(branch2._readableStreamController, chunk2);
+                    }
+                    reading = false;
+                    if (readAgain) {
+                        pullAlgorithm();
+                    }
+                });
+            },
+            _closeSteps: () => {
+                reading = false;
+                if (!canceled1) {
+                    ReadableStreamDefaultControllerClose(branch1._readableStreamController);
+                }
+                if (!canceled2) {
+                    ReadableStreamDefaultControllerClose(branch2._readableStreamController);
+                }
+                if (!canceled1 || !canceled2) {
+                    resolveCancelPromise(undefined);
+                }
+            },
+            _errorSteps: () => {
+                reading = false;
+            }
+        };
+        ReadableStreamDefaultReaderRead(reader, readRequest);
+        return promiseResolvedWith(undefined);
+    }
+    function cancel1Algorithm(reason) {
+        canceled1 = true;
+        reason1 = reason;
+        if (canceled2) {
+            const compositeReason = CreateArrayFromList([reason1, reason2]);
+            const cancelResult = ReadableStreamCancel(stream, compositeReason);
+            resolveCancelPromise(cancelResult);
+        }
+        return cancelPromise;
+    }
+    function cancel2Algorithm(reason) {
+        canceled2 = true;
+        reason2 = reason;
+        if (canceled1) {
+            const compositeReason = CreateArrayFromList([reason1, reason2]);
+            const cancelResult = ReadableStreamCancel(stream, compositeReason);
+            resolveCancelPromise(cancelResult);
+        }
+        return cancelPromise;
+    }
+    function startAlgorithm() {
+        // do nothing
+    }
+    branch1 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel1Algorithm);
+    branch2 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel2Algorithm);
+    uponRejection(reader._closedPromise, (r) => {
+        ReadableStreamDefaultControllerError(branch1._readableStreamController, r);
+        ReadableStreamDefaultControllerError(branch2._readableStreamController, r);
+        if (!canceled1 || !canceled2) {
+            resolveCancelPromise(undefined);
+        }
+    });
+    return [branch1, branch2];
+}
+function ReadableByteStreamTee(stream) {
+    let reader = AcquireReadableStreamDefaultReader(stream);
+    let reading = false;
+    let readAgainForBranch1 = false;
+    let readAgainForBranch2 = false;
+    let canceled1 = false;
+    let canceled2 = false;
+    let reason1;
+    let reason2;
+    let branch1;
+    let branch2;
+    let resolveCancelPromise;
+    const cancelPromise = newPromise(resolve => {
+        resolveCancelPromise = resolve;
+    });
+    function forwardReaderError(thisReader) {
+        uponRejection(thisReader._closedPromise, r => {
+            if (thisReader !== reader) {
+                return;
+            }
+            ReadableByteStreamControllerError(branch1._readableStreamController, r);
+            ReadableByteStreamControllerError(branch2._readableStreamController, r);
+            if (!canceled1 || !canceled2) {
+                resolveCancelPromise(undefined);
+            }
+        });
+    }
+    function pullWithDefaultReader() {
+        if (IsReadableStreamBYOBReader(reader)) {
+            ReadableStreamReaderGenericRelease(reader);
+            reader = AcquireReadableStreamDefaultReader(stream);
+            forwardReaderError(reader);
+        }
+        const readRequest = {
+            _chunkSteps: chunk => {
+                // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                // successful synchronously-available reads get ahead of asynchronously-available errors.
+                queueMicrotask(() => {
+                    readAgainForBranch1 = false;
+                    readAgainForBranch2 = false;
+                    const chunk1 = chunk;
+                    let chunk2 = chunk;
+                    if (!canceled1 && !canceled2) {
+                        try {
+                            chunk2 = CloneAsUint8Array(chunk);
+                        }
+                        catch (cloneE) {
+                            ReadableByteStreamControllerError(branch1._readableStreamController, cloneE);
+                            ReadableByteStreamControllerError(branch2._readableStreamController, cloneE);
+                            resolveCancelPromise(ReadableStreamCancel(stream, cloneE));
+                            return;
+                        }
+                    }
+                    if (!canceled1) {
+                        ReadableByteStreamControllerEnqueue(branch1._readableStreamController, chunk1);
+                    }
+                    if (!canceled2) {
+                        ReadableByteStreamControllerEnqueue(branch2._readableStreamController, chunk2);
+                    }
+                    reading = false;
+                    if (readAgainForBranch1) {
+                        pull1Algorithm();
+                    }
+                    else if (readAgainForBranch2) {
+                        pull2Algorithm();
+                    }
+                });
+            },
+            _closeSteps: () => {
+                reading = false;
+                if (!canceled1) {
+                    ReadableByteStreamControllerClose(branch1._readableStreamController);
+                }
+                if (!canceled2) {
+                    ReadableByteStreamControllerClose(branch2._readableStreamController);
+                }
+                if (branch1._readableStreamController._pendingPullIntos.length > 0) {
+                    ReadableByteStreamControllerRespond(branch1._readableStreamController, 0);
+                }
+                if (branch2._readableStreamController._pendingPullIntos.length > 0) {
+                    ReadableByteStreamControllerRespond(branch2._readableStreamController, 0);
+                }
+                if (!canceled1 || !canceled2) {
+                    resolveCancelPromise(undefined);
+                }
+            },
+            _errorSteps: () => {
+                reading = false;
+            }
+        };
+        ReadableStreamDefaultReaderRead(reader, readRequest);
+    }
+    function pullWithBYOBReader(view, forBranch2) {
+        if (IsReadableStreamDefaultReader(reader)) {
+            ReadableStreamReaderGenericRelease(reader);
+            reader = AcquireReadableStreamBYOBReader(stream);
+            forwardReaderError(reader);
+        }
+        const byobBranch = forBranch2 ? branch2 : branch1;
+        const otherBranch = forBranch2 ? branch1 : branch2;
+        const readIntoRequest = {
+            _chunkSteps: chunk => {
+                // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                // successful synchronously-available reads get ahead of asynchronously-available errors.
+                queueMicrotask(() => {
+                    readAgainForBranch1 = false;
+                    readAgainForBranch2 = false;
+                    const byobCanceled = forBranch2 ? canceled2 : canceled1;
+                    const otherCanceled = forBranch2 ? canceled1 : canceled2;
+                    if (!otherCanceled) {
+                        let clonedChunk;
+                        try {
+                            clonedChunk = CloneAsUint8Array(chunk);
+                        }
+                        catch (cloneE) {
+                            ReadableByteStreamControllerError(byobBranch._readableStreamController, cloneE);
+                            ReadableByteStreamControllerError(otherBranch._readableStreamController, cloneE);
+                            resolveCancelPromise(ReadableStreamCancel(stream, cloneE));
+                            return;
+                        }
+                        if (!byobCanceled) {
+                            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                        }
+                        ReadableByteStreamControllerEnqueue(otherBranch._readableStreamController, clonedChunk);
+                    }
+                    else if (!byobCanceled) {
+                        ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                    }
+                    reading = false;
+                    if (readAgainForBranch1) {
+                        pull1Algorithm();
+                    }
+                    else if (readAgainForBranch2) {
+                        pull2Algorithm();
+                    }
+                });
+            },
+            _closeSteps: chunk => {
+                reading = false;
+                const byobCanceled = forBranch2 ? canceled2 : canceled1;
+                const otherCanceled = forBranch2 ? canceled1 : canceled2;
+                if (!byobCanceled) {
+                    ReadableByteStreamControllerClose(byobBranch._readableStreamController);
+                }
+                if (!otherCanceled) {
+                    ReadableByteStreamControllerClose(otherBranch._readableStreamController);
+                }
+                if (chunk !== undefined) {
+                    if (!byobCanceled) {
+                        ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                    }
+                    if (!otherCanceled && otherBranch._readableStreamController._pendingPullIntos.length > 0) {
+                        ReadableByteStreamControllerRespond(otherBranch._readableStreamController, 0);
+                    }
+                }
+                if (!byobCanceled || !otherCanceled) {
+                    resolveCancelPromise(undefined);
+                }
+            },
+            _errorSteps: () => {
+                reading = false;
+            }
+        };
+        ReadableStreamBYOBReaderRead(reader, view, readIntoRequest);
+    }
+    function pull1Algorithm() {
+        if (reading) {
+            readAgainForBranch1 = true;
+            return promiseResolvedWith(undefined);
+        }
+        reading = true;
+        const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch1._readableStreamController);
+        if (byobRequest === null) {
+            pullWithDefaultReader();
+        }
+        else {
+            pullWithBYOBReader(byobRequest._view, false);
+        }
+        return promiseResolvedWith(undefined);
+    }
+    function pull2Algorithm() {
+        if (reading) {
+            readAgainForBranch2 = true;
+            return promiseResolvedWith(undefined);
+        }
+        reading = true;
+        const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch2._readableStreamController);
+        if (byobRequest === null) {
+            pullWithDefaultReader();
+        }
+        else {
+            pullWithBYOBReader(byobRequest._view, true);
+        }
+        return promiseResolvedWith(undefined);
+    }
+    function cancel1Algorithm(reason) {
+        canceled1 = true;
+        reason1 = reason;
+        if (canceled2) {
+            const compositeReason = CreateArrayFromList([reason1, reason2]);
+            const cancelResult = ReadableStreamCancel(stream, compositeReason);
+            resolveCancelPromise(cancelResult);
+        }
+        return cancelPromise;
+    }
+    function cancel2Algorithm(reason) {
+        canceled2 = true;
+        reason2 = reason;
+        if (canceled1) {
+            const compositeReason = CreateArrayFromList([reason1, reason2]);
+            const cancelResult = ReadableStreamCancel(stream, compositeReason);
+            resolveCancelPromise(cancelResult);
+        }
+        return cancelPromise;
+    }
+    function startAlgorithm() {
+        return;
+    }
+    branch1 = CreateReadableByteStream(startAlgorithm, pull1Algorithm, cancel1Algorithm);
+    branch2 = CreateReadableByteStream(startAlgorithm, pull2Algorithm, cancel2Algorithm);
+    forwardReaderError(reader);
+    return [branch1, branch2];
+}
+
+function convertUnderlyingDefaultOrByteSource(source, context) {
+    assertDictionary(source, context);
+    const original = source;
+    const autoAllocateChunkSize = original === null || original === void 0 ? void 0 : original.autoAllocateChunkSize;
+    const cancel = original === null || original === void 0 ? void 0 : original.cancel;
+    const pull = original === null || original === void 0 ? void 0 : original.pull;
+    const start = original === null || original === void 0 ? void 0 : original.start;
+    const type = original === null || original === void 0 ? void 0 : original.type;
+    return {
+        autoAllocateChunkSize: autoAllocateChunkSize === undefined ?
+            undefined :
+            convertUnsignedLongLongWithEnforceRange(autoAllocateChunkSize, `${context} has member 'autoAllocateChunkSize' that`),
+        cancel: cancel === undefined ?
+            undefined :
+            convertUnderlyingSourceCancelCallback(cancel, original, `${context} has member 'cancel' that`),
+        pull: pull === undefined ?
+            undefined :
+            convertUnderlyingSourcePullCallback(pull, original, `${context} has member 'pull' that`),
+        start: start === undefined ?
+            undefined :
+            convertUnderlyingSourceStartCallback(start, original, `${context} has member 'start' that`),
+        type: type === undefined ? undefined : convertReadableStreamType(type, `${context} has member 'type' that`)
+    };
+}
+function convertUnderlyingSourceCancelCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (reason) => promiseCall(fn, original, [reason]);
+}
+function convertUnderlyingSourcePullCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (controller) => promiseCall(fn, original, [controller]);
+}
+function convertUnderlyingSourceStartCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (controller) => reflectCall(fn, original, [controller]);
+}
+function convertReadableStreamType(type, context) {
+    type = `${type}`;
+    if (type !== 'bytes') {
+        throw new TypeError(`${context} '${type}' is not a valid enumeration value for ReadableStreamType`);
+    }
+    return type;
+}
+
+function convertReaderOptions(options, context) {
+    assertDictionary(options, context);
+    const mode = options === null || options === void 0 ? void 0 : options.mode;
+    return {
+        mode: mode === undefined ? undefined : convertReadableStreamReaderMode(mode, `${context} has member 'mode' that`)
+    };
+}
+function convertReadableStreamReaderMode(mode, context) {
+    mode = `${mode}`;
+    if (mode !== 'byob') {
+        throw new TypeError(`${context} '${mode}' is not a valid enumeration value for ReadableStreamReaderMode`);
+    }
+    return mode;
+}
+
+function convertIteratorOptions(options, context) {
+    assertDictionary(options, context);
+    const preventCancel = options === null || options === void 0 ? void 0 : options.preventCancel;
+    return { preventCancel: Boolean(preventCancel) };
+}
+
+function convertPipeOptions(options, context) {
+    assertDictionary(options, context);
+    const preventAbort = options === null || options === void 0 ? void 0 : options.preventAbort;
+    const preventCancel = options === null || options === void 0 ? void 0 : options.preventCancel;
+    const preventClose = options === null || options === void 0 ? void 0 : options.preventClose;
+    const signal = options === null || options === void 0 ? void 0 : options.signal;
+    if (signal !== undefined) {
+        assertAbortSignal(signal, `${context} has member 'signal' that`);
+    }
+    return {
+        preventAbort: Boolean(preventAbort),
+        preventCancel: Boolean(preventCancel),
+        preventClose: Boolean(preventClose),
+        signal
+    };
+}
+function assertAbortSignal(signal, context) {
+    if (!isAbortSignal(signal)) {
+        throw new TypeError(`${context} is not an AbortSignal.`);
+    }
+}
+
+function convertReadableWritablePair(pair, context) {
+    assertDictionary(pair, context);
+    const readable = pair === null || pair === void 0 ? void 0 : pair.readable;
+    assertRequiredField(readable, 'readable', 'ReadableWritablePair');
+    assertReadableStream(readable, `${context} has member 'readable' that`);
+    const writable = pair === null || pair === void 0 ? void 0 : pair.writable;
+    assertRequiredField(writable, 'writable', 'ReadableWritablePair');
+    assertWritableStream(writable, `${context} has member 'writable' that`);
+    return { readable, writable };
+}
+
+/**
+ * A readable stream represents a source of data, from which you can read.
+ *
+ * @public
+ */
+class ReadableStream {
+    constructor(rawUnderlyingSource = {}, rawStrategy = {}) {
+        if (rawUnderlyingSource === undefined) {
+            rawUnderlyingSource = null;
+        }
+        else {
+            assertObject(rawUnderlyingSource, 'First parameter');
+        }
+        const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');
+        const underlyingSource = convertUnderlyingDefaultOrByteSource(rawUnderlyingSource, 'First parameter');
+        InitializeReadableStream(this);
+        if (underlyingSource.type === 'bytes') {
+            if (strategy.size !== undefined) {
+                throw new RangeError('The strategy for a byte stream cannot have a size function');
+            }
+            const highWaterMark = ExtractHighWaterMark(strategy, 0);
+            SetUpReadableByteStreamControllerFromUnderlyingSource(this, underlyingSource, highWaterMark);
+        }
+        else {
+            const sizeAlgorithm = ExtractSizeAlgorithm(strategy);
+            const highWaterMark = ExtractHighWaterMark(strategy, 1);
+            SetUpReadableStreamDefaultControllerFromUnderlyingSource(this, underlyingSource, highWaterMark, sizeAlgorithm);
+        }
+    }
+    /**
+     * Whether or not the readable stream is locked to a {@link ReadableStreamDefaultReader | reader}.
+     */
+    get locked() {
+        if (!IsReadableStream(this)) {
+            throw streamBrandCheckException$1('locked');
+        }
+        return IsReadableStreamLocked(this);
+    }
+    /**
+     * Cancels the stream, signaling a loss of interest in the stream by a consumer.
+     *
+     * The supplied `reason` argument will be given to the underlying source's {@link UnderlyingSource.cancel | cancel()}
+     * method, which might or might not use it.
+     */
+    cancel(reason = undefined) {
+        if (!IsReadableStream(this)) {
+            return promiseRejectedWith(streamBrandCheckException$1('cancel'));
+        }
+        if (IsReadableStreamLocked(this)) {
+            return promiseRejectedWith(new TypeError('Cannot cancel a stream that already has a reader'));
+        }
+        return ReadableStreamCancel(this, reason);
+    }
+    getReader(rawOptions = undefined) {
+        if (!IsReadableStream(this)) {
+            throw streamBrandCheckException$1('getReader');
+        }
+        const options = convertReaderOptions(rawOptions, 'First parameter');
+        if (options.mode === undefined) {
+            return AcquireReadableStreamDefaultReader(this);
+        }
+        return AcquireReadableStreamBYOBReader(this);
+    }
+    pipeThrough(rawTransform, rawOptions = {}) {
+        if (!IsReadableStream(this)) {
+            throw streamBrandCheckException$1('pipeThrough');
+        }
+        assertRequiredArgument(rawTransform, 1, 'pipeThrough');
+        const transform = convertReadableWritablePair(rawTransform, 'First parameter');
+        const options = convertPipeOptions(rawOptions, 'Second parameter');
+        if (IsReadableStreamLocked(this)) {
+            throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked ReadableStream');
+        }
+        if (IsWritableStreamLocked(transform.writable)) {
+            throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked WritableStream');
+        }
+        const promise = ReadableStreamPipeTo(this, transform.writable, options.preventClose, options.preventAbort, options.preventCancel, options.signal);
+        setPromiseIsHandledToTrue(promise);
+        return transform.readable;
+    }
+    pipeTo(destination, rawOptions = {}) {
+        if (!IsReadableStream(this)) {
+            return promiseRejectedWith(streamBrandCheckException$1('pipeTo'));
+        }
+        if (destination === undefined) {
+            return promiseRejectedWith(`Parameter 1 is required in 'pipeTo'.`);
+        }
+        if (!IsWritableStream(destination)) {
+            return promiseRejectedWith(new TypeError(`ReadableStream.prototype.pipeTo's first argument must be a WritableStream`));
+        }
+        let options;
+        try {
+            options = convertPipeOptions(rawOptions, 'Second parameter');
+        }
+        catch (e) {
+            return promiseRejectedWith(e);
+        }
+        if (IsReadableStreamLocked(this)) {
+            return promiseRejectedWith(new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream'));
+        }
+        if (IsWritableStreamLocked(destination)) {
+            return promiseRejectedWith(new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream'));
+        }
+        return ReadableStreamPipeTo(this, destination, options.preventClose, options.preventAbort, options.preventCancel, options.signal);
+    }
+    /**
+     * Tees this readable stream, returning a two-element array containing the two resulting branches as
+     * new {@link ReadableStream} instances.
+     *
+     * Teeing a stream will lock it, preventing any other consumer from acquiring a reader.
+     * To cancel the stream, cancel both of the resulting branches; a composite cancellation reason will then be
+     * propagated to the stream's underlying source.
+     *
+     * Note that the chunks seen in each branch will be the same object. If the chunks are not immutable,
+     * this could allow interference between the two branches.
+     */
+    tee() {
+        if (!IsReadableStream(this)) {
+            throw streamBrandCheckException$1('tee');
+        }
+        const branches = ReadableStreamTee(this);
+        return CreateArrayFromList(branches);
+    }
+    values(rawOptions = undefined) {
+        if (!IsReadableStream(this)) {
+            throw streamBrandCheckException$1('values');
+        }
+        const options = convertIteratorOptions(rawOptions, 'First parameter');
+        return AcquireReadableStreamAsyncIterator(this, options.preventCancel);
+    }
+}
+Object.defineProperties(ReadableStream.prototype, {
+    cancel: { enumerable: true },
+    getReader: { enumerable: true },
+    pipeThrough: { enumerable: true },
+    pipeTo: { enumerable: true },
+    tee: { enumerable: true },
+    values: { enumerable: true },
+    locked: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableStream.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableStream',
+        configurable: true
+    });
+}
+if (typeof SymbolPolyfill.asyncIterator === 'symbol') {
+    Object.defineProperty(ReadableStream.prototype, SymbolPolyfill.asyncIterator, {
+        value: ReadableStream.prototype.values,
+        writable: true,
+        configurable: true
+    });
+}
+// Abstract operations for the ReadableStream.
+// Throws if and only if startAlgorithm throws.
+function CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark = 1, sizeAlgorithm = () => 1) {
+    const stream = Object.create(ReadableStream.prototype);
+    InitializeReadableStream(stream);
+    const controller = Object.create(ReadableStreamDefaultController.prototype);
+    SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm);
+    return stream;
+}
+// Throws if and only if startAlgorithm throws.
+function CreateReadableByteStream(startAlgorithm, pullAlgorithm, cancelAlgorithm) {
+    const stream = Object.create(ReadableStream.prototype);
+    InitializeReadableStream(stream);
+    const controller = Object.create(ReadableByteStreamController.prototype);
+    SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, 0, undefined);
+    return stream;
+}
+function InitializeReadableStream(stream) {
+    stream._state = 'readable';
+    stream._reader = undefined;
+    stream._storedError = undefined;
+    stream._disturbed = false;
+}
+function IsReadableStream(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_readableStreamController')) {
+        return false;
+    }
+    return x instanceof ReadableStream;
+}
+function IsReadableStreamLocked(stream) {
+    if (stream._reader === undefined) {
+        return false;
+    }
+    return true;
+}
+// ReadableStream API exposed for controllers.
+function ReadableStreamCancel(stream, reason) {
+    stream._disturbed = true;
+    if (stream._state === 'closed') {
+        return promiseResolvedWith(undefined);
+    }
+    if (stream._state === 'errored') {
+        return promiseRejectedWith(stream._storedError);
+    }
+    ReadableStreamClose(stream);
+    const reader = stream._reader;
+    if (reader !== undefined && IsReadableStreamBYOBReader(reader)) {
+        reader._readIntoRequests.forEach(readIntoRequest => {
+            readIntoRequest._closeSteps(undefined);
+        });
+        reader._readIntoRequests = new SimpleQueue();
+    }
+    const sourceCancelPromise = stream._readableStreamController[CancelSteps](reason);
+    return transformPromiseWith(sourceCancelPromise, noop);
+}
+function ReadableStreamClose(stream) {
+    stream._state = 'closed';
+    const reader = stream._reader;
+    if (reader === undefined) {
+        return;
+    }
+    defaultReaderClosedPromiseResolve(reader);
+    if (IsReadableStreamDefaultReader(reader)) {
+        reader._readRequests.forEach(readRequest => {
+            readRequest._closeSteps();
+        });
+        reader._readRequests = new SimpleQueue();
+    }
+}
+function ReadableStreamError(stream, e) {
+    stream._state = 'errored';
+    stream._storedError = e;
+    const reader = stream._reader;
+    if (reader === undefined) {
+        return;
+    }
+    defaultReaderClosedPromiseReject(reader, e);
+    if (IsReadableStreamDefaultReader(reader)) {
+        reader._readRequests.forEach(readRequest => {
+            readRequest._errorSteps(e);
+        });
+        reader._readRequests = new SimpleQueue();
+    }
+    else {
+        reader._readIntoRequests.forEach(readIntoRequest => {
+            readIntoRequest._errorSteps(e);
+        });
+        reader._readIntoRequests = new SimpleQueue();
+    }
+}
+// Helper functions for the ReadableStream.
+function streamBrandCheckException$1(name) {
+    return new TypeError(`ReadableStream.prototype.${name} can only be used on a ReadableStream`);
+}
+
+function convertQueuingStrategyInit(init, context) {
+    assertDictionary(init, context);
+    const highWaterMark = init === null || init === void 0 ? void 0 : init.highWaterMark;
+    assertRequiredField(highWaterMark, 'highWaterMark', 'QueuingStrategyInit');
+    return {
+        highWaterMark: convertUnrestrictedDouble(highWaterMark)
+    };
+}
+
+// The size function must not have a prototype property nor be a constructor
+const byteLengthSizeFunction = (chunk) => {
+    return chunk.byteLength;
+};
+try {
+    Object.defineProperty(byteLengthSizeFunction, 'name', {
+        value: 'size',
+        configurable: true
+    });
+}
+catch (_a) {
+    // This property is non-configurable in older browsers, so ignore if this throws.
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility
+}
+/**
+ * A queuing strategy that counts the number of bytes in each chunk.
+ *
+ * @public
+ */
+class ByteLengthQueuingStrategy {
+    constructor(options) {
+        assertRequiredArgument(options, 1, 'ByteLengthQueuingStrategy');
+        options = convertQueuingStrategyInit(options, 'First parameter');
+        this._byteLengthQueuingStrategyHighWaterMark = options.highWaterMark;
+    }
+    /**
+     * Returns the high water mark provided to the constructor.
+     */
+    get highWaterMark() {
+        if (!IsByteLengthQueuingStrategy(this)) {
+            throw byteLengthBrandCheckException('highWaterMark');
+        }
+        return this._byteLengthQueuingStrategyHighWaterMark;
+    }
+    /**
+     * Measures the size of `chunk` by returning the value of its `byteLength` property.
+     */
+    get size() {
+        if (!IsByteLengthQueuingStrategy(this)) {
+            throw byteLengthBrandCheckException('size');
+        }
+        return byteLengthSizeFunction;
+    }
+}
+Object.defineProperties(ByteLengthQueuingStrategy.prototype, {
+    highWaterMark: { enumerable: true },
+    size: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ByteLengthQueuingStrategy.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ByteLengthQueuingStrategy',
+        configurable: true
+    });
+}
+// Helper functions for the ByteLengthQueuingStrategy.
+function byteLengthBrandCheckException(name) {
+    return new TypeError(`ByteLengthQueuingStrategy.prototype.${name} can only be used on a ByteLengthQueuingStrategy`);
+}
+function IsByteLengthQueuingStrategy(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_byteLengthQueuingStrategyHighWaterMark')) {
+        return false;
+    }
+    return x instanceof ByteLengthQueuingStrategy;
+}
+
+// The size function must not have a prototype property nor be a constructor
+const countSizeFunction = () => {
+    return 1;
+};
+try {
+    Object.defineProperty(countSizeFunction, 'name', {
+        value: 'size',
+        configurable: true
+    });
+}
+catch (_a) {
+    // This property is non-configurable in older browsers, so ignore if this throws.
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility
+}
+/**
+ * A queuing strategy that counts the number of chunks.
+ *
+ * @public
+ */
+class CountQueuingStrategy {
+    constructor(options) {
+        assertRequiredArgument(options, 1, 'CountQueuingStrategy');
+        options = convertQueuingStrategyInit(options, 'First parameter');
+        this._countQueuingStrategyHighWaterMark = options.highWaterMark;
+    }
+    /**
+     * Returns the high water mark provided to the constructor.
+     */
+    get highWaterMark() {
+        if (!IsCountQueuingStrategy(this)) {
+            throw countBrandCheckException('highWaterMark');
+        }
+        return this._countQueuingStrategyHighWaterMark;
+    }
+    /**
+     * Measures the size of `chunk` by always returning 1.
+     * This ensures that the total queue size is a count of the number of chunks in the queue.
+     */
+    get size() {
+        if (!IsCountQueuingStrategy(this)) {
+            throw countBrandCheckException('size');
+        }
+        return countSizeFunction;
+    }
+}
+Object.defineProperties(CountQueuingStrategy.prototype, {
+    highWaterMark: { enumerable: true },
+    size: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(CountQueuingStrategy.prototype, SymbolPolyfill.toStringTag, {
+        value: 'CountQueuingStrategy',
+        configurable: true
+    });
+}
+// Helper functions for the CountQueuingStrategy.
+function countBrandCheckException(name) {
+    return new TypeError(`CountQueuingStrategy.prototype.${name} can only be used on a CountQueuingStrategy`);
+}
+function IsCountQueuingStrategy(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_countQueuingStrategyHighWaterMark')) {
+        return false;
+    }
+    return x instanceof CountQueuingStrategy;
+}
+
+function convertTransformer(original, context) {
+    assertDictionary(original, context);
+    const flush = original === null || original === void 0 ? void 0 : original.flush;
+    const readableType = original === null || original === void 0 ? void 0 : original.readableType;
+    const start = original === null || original === void 0 ? void 0 : original.start;
+    const transform = original === null || original === void 0 ? void 0 : original.transform;
+    const writableType = original === null || original === void 0 ? void 0 : original.writableType;
+    return {
+        flush: flush === undefined ?
+            undefined :
+            convertTransformerFlushCallback(flush, original, `${context} has member 'flush' that`),
+        readableType,
+        start: start === undefined ?
+            undefined :
+            convertTransformerStartCallback(start, original, `${context} has member 'start' that`),
+        transform: transform === undefined ?
+            undefined :
+            convertTransformerTransformCallback(transform, original, `${context} has member 'transform' that`),
+        writableType
+    };
+}
+function convertTransformerFlushCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (controller) => promiseCall(fn, original, [controller]);
+}
+function convertTransformerStartCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (controller) => reflectCall(fn, original, [controller]);
+}
+function convertTransformerTransformCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (chunk, controller) => promiseCall(fn, original, [chunk, controller]);
+}
+
+// Class TransformStream
+/**
+ * A transform stream consists of a pair of streams: a {@link WritableStream | writable stream},
+ * known as its writable side, and a {@link ReadableStream | readable stream}, known as its readable side.
+ * In a manner specific to the transform stream in question, writes to the writable side result in new data being
+ * made available for reading from the readable side.
+ *
+ * @public
+ */
+class TransformStream {
+    constructor(rawTransformer = {}, rawWritableStrategy = {}, rawReadableStrategy = {}) {
+        if (rawTransformer === undefined) {
+            rawTransformer = null;
+        }
+        const writableStrategy = convertQueuingStrategy(rawWritableStrategy, 'Second parameter');
+        const readableStrategy = convertQueuingStrategy(rawReadableStrategy, 'Third parameter');
+        const transformer = convertTransformer(rawTransformer, 'First parameter');
+        if (transformer.readableType !== undefined) {
+            throw new RangeError('Invalid readableType specified');
+        }
+        if (transformer.writableType !== undefined) {
+            throw new RangeError('Invalid writableType specified');
+        }
+        const readableHighWaterMark = ExtractHighWaterMark(readableStrategy, 0);
+        const readableSizeAlgorithm = ExtractSizeAlgorithm(readableStrategy);
+        const writableHighWaterMark = ExtractHighWaterMark(writableStrategy, 1);
+        const writableSizeAlgorithm = ExtractSizeAlgorithm(writableStrategy);
+        let startPromise_resolve;
+        const startPromise = newPromise(resolve => {
+            startPromise_resolve = resolve;
+        });
+        InitializeTransformStream(this, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm);
+        SetUpTransformStreamDefaultControllerFromTransformer(this, transformer);
+        if (transformer.start !== undefined) {
+            startPromise_resolve(transformer.start(this._transformStreamController));
+        }
+        else {
+            startPromise_resolve(undefined);
+        }
+    }
+    /**
+     * The readable side of the transform stream.
+     */
+    get readable() {
+        if (!IsTransformStream(this)) {
+            throw streamBrandCheckException('readable');
+        }
+        return this._readable;
+    }
+    /**
+     * The writable side of the transform stream.
+     */
+    get writable() {
+        if (!IsTransformStream(this)) {
+            throw streamBrandCheckException('writable');
+        }
+        return this._writable;
+    }
+}
+Object.defineProperties(TransformStream.prototype, {
+    readable: { enumerable: true },
+    writable: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(TransformStream.prototype, SymbolPolyfill.toStringTag, {
+        value: 'TransformStream',
+        configurable: true
+    });
+}
+function InitializeTransformStream(stream, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm) {
+    function startAlgorithm() {
+        return startPromise;
+    }
+    function writeAlgorithm(chunk) {
+        return TransformStreamDefaultSinkWriteAlgorithm(stream, chunk);
+    }
+    function abortAlgorithm(reason) {
+        return TransformStreamDefaultSinkAbortAlgorithm(stream, reason);
+    }
+    function closeAlgorithm() {
+        return TransformStreamDefaultSinkCloseAlgorithm(stream);
+    }
+    stream._writable = CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, writableHighWaterMark, writableSizeAlgorithm);
+    function pullAlgorithm() {
+        return TransformStreamDefaultSourcePullAlgorithm(stream);
+    }
+    function cancelAlgorithm(reason) {
+        TransformStreamErrorWritableAndUnblockWrite(stream, reason);
+        return promiseResolvedWith(undefined);
+    }
+    stream._readable = CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, readableHighWaterMark, readableSizeAlgorithm);
+    // The [[backpressure]] slot is set to undefined so that it can be initialised by TransformStreamSetBackpressure.
+    stream._backpressure = undefined;
+    stream._backpressureChangePromise = undefined;
+    stream._backpressureChangePromise_resolve = undefined;
+    TransformStreamSetBackpressure(stream, true);
+    stream._transformStreamController = undefined;
+}
+function IsTransformStream(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_transformStreamController')) {
+        return false;
+    }
+    return x instanceof TransformStream;
+}
+// This is a no-op if both sides are already errored.
+function TransformStreamError(stream, e) {
+    ReadableStreamDefaultControllerError(stream._readable._readableStreamController, e);
+    TransformStreamErrorWritableAndUnblockWrite(stream, e);
+}
+function TransformStreamErrorWritableAndUnblockWrite(stream, e) {
+    TransformStreamDefaultControllerClearAlgorithms(stream._transformStreamController);
+    WritableStreamDefaultControllerErrorIfNeeded(stream._writable._writableStreamController, e);
+    if (stream._backpressure) {
+        // Pretend that pull() was called to permit any pending write() calls to complete. TransformStreamSetBackpressure()
+        // cannot be called from enqueue() or pull() once the ReadableStream is errored, so this will will be the final time
+        // _backpressure is set.
+        TransformStreamSetBackpressure(stream, false);
+    }
+}
+function TransformStreamSetBackpressure(stream, backpressure) {
+    // Passes also when called during construction.
+    if (stream._backpressureChangePromise !== undefined) {
+        stream._backpressureChangePromise_resolve();
+    }
+    stream._backpressureChangePromise = newPromise(resolve => {
+        stream._backpressureChangePromise_resolve = resolve;
+    });
+    stream._backpressure = backpressure;
+}
+// Class TransformStreamDefaultController
+/**
+ * Allows control of the {@link ReadableStream} and {@link WritableStream} of the associated {@link TransformStream}.
+ *
+ * @public
+ */
+class TransformStreamDefaultController {
+    constructor() {
+        throw new TypeError('Illegal constructor');
+    }
+    /**
+     * Returns the desired size to fill the readable side’s internal queue. It can be negative, if the queue is over-full.
+     */
+    get desiredSize() {
+        if (!IsTransformStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException('desiredSize');
+        }
+        const readableController = this._controlledTransformStream._readable._readableStreamController;
+        return ReadableStreamDefaultControllerGetDesiredSize(readableController);
+    }
+    enqueue(chunk = undefined) {
+        if (!IsTransformStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException('enqueue');
+        }
+        TransformStreamDefaultControllerEnqueue(this, chunk);
+    }
+    /**
+     * Errors both the readable side and the writable side of the controlled transform stream, making all future
+     * interactions with it fail with the given error `e`. Any chunks queued for transformation will be discarded.
+     */
+    error(reason = undefined) {
+        if (!IsTransformStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException('error');
+        }
+        TransformStreamDefaultControllerError(this, reason);
+    }
+    /**
+     * Closes the readable side and errors the writable side of the controlled transform stream. This is useful when the
+     * transformer only needs to consume a portion of the chunks written to the writable side.
+     */
+    terminate() {
+        if (!IsTransformStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException('terminate');
+        }
+        TransformStreamDefaultControllerTerminate(this);
+    }
+}
+Object.defineProperties(TransformStreamDefaultController.prototype, {
+    enqueue: { enumerable: true },
+    error: { enumerable: true },
+    terminate: { enumerable: true },
+    desiredSize: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(TransformStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+        value: 'TransformStreamDefaultController',
+        configurable: true
+    });
+}
+// Transform Stream Default Controller Abstract Operations
+function IsTransformStreamDefaultController(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_controlledTransformStream')) {
+        return false;
+    }
+    return x instanceof TransformStreamDefaultController;
+}
+function SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm) {
+    controller._controlledTransformStream = stream;
+    stream._transformStreamController = controller;
+    controller._transformAlgorithm = transformAlgorithm;
+    controller._flushAlgorithm = flushAlgorithm;
+}
+function SetUpTransformStreamDefaultControllerFromTransformer(stream, transformer) {
+    const controller = Object.create(TransformStreamDefaultController.prototype);
+    let transformAlgorithm = (chunk) => {
+        try {
+            TransformStreamDefaultControllerEnqueue(controller, chunk);
+            return promiseResolvedWith(undefined);
+        }
+        catch (transformResultE) {
+            return promiseRejectedWith(transformResultE);
+        }
+    };
+    let flushAlgorithm = () => promiseResolvedWith(undefined);
+    if (transformer.transform !== undefined) {
+        transformAlgorithm = chunk => transformer.transform(chunk, controller);
+    }
+    if (transformer.flush !== undefined) {
+        flushAlgorithm = () => transformer.flush(controller);
+    }
+    SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);
+}
+function TransformStreamDefaultControllerClearAlgorithms(controller) {
+    controller._transformAlgorithm = undefined;
+    controller._flushAlgorithm = undefined;
+}
+function TransformStreamDefaultControllerEnqueue(controller, chunk) {
+    const stream = controller._controlledTransformStream;
+    const readableController = stream._readable._readableStreamController;
+    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(readableController)) {
+        throw new TypeError('Readable side is not in a state that permits enqueue');
+    }
+    // We throttle transform invocations based on the backpressure of the ReadableStream, but we still
+    // accept TransformStreamDefaultControllerEnqueue() calls.
+    try {
+        ReadableStreamDefaultControllerEnqueue(readableController, chunk);
+    }
+    catch (e) {
+        // This happens when readableStrategy.size() throws.
+        TransformStreamErrorWritableAndUnblockWrite(stream, e);
+        throw stream._readable._storedError;
+    }
+    const backpressure = ReadableStreamDefaultControllerHasBackpressure(readableController);
+    if (backpressure !== stream._backpressure) {
+        TransformStreamSetBackpressure(stream, true);
+    }
+}
+function TransformStreamDefaultControllerError(controller, e) {
+    TransformStreamError(controller._controlledTransformStream, e);
+}
+function TransformStreamDefaultControllerPerformTransform(controller, chunk) {
+    const transformPromise = controller._transformAlgorithm(chunk);
+    return transformPromiseWith(transformPromise, undefined, r => {
+        TransformStreamError(controller._controlledTransformStream, r);
+        throw r;
+    });
+}
+function TransformStreamDefaultControllerTerminate(controller) {
+    const stream = controller._controlledTransformStream;
+    const readableController = stream._readable._readableStreamController;
+    ReadableStreamDefaultControllerClose(readableController);
+    const error = new TypeError('TransformStream terminated');
+    TransformStreamErrorWritableAndUnblockWrite(stream, error);
+}
+// TransformStreamDefaultSink Algorithms
+function TransformStreamDefaultSinkWriteAlgorithm(stream, chunk) {
+    const controller = stream._transformStreamController;
+    if (stream._backpressure) {
+        const backpressureChangePromise = stream._backpressureChangePromise;
+        return transformPromiseWith(backpressureChangePromise, () => {
+            const writable = stream._writable;
+            const state = writable._state;
+            if (state === 'erroring') {
+                throw writable._storedError;
+            }
+            return TransformStreamDefaultControllerPerformTransform(controller, chunk);
+        });
+    }
+    return TransformStreamDefaultControllerPerformTransform(controller, chunk);
+}
+function TransformStreamDefaultSinkAbortAlgorithm(stream, reason) {
+    // abort() is not called synchronously, so it is possible for abort() to be called when the stream is already
+    // errored.
+    TransformStreamError(stream, reason);
+    return promiseResolvedWith(undefined);
+}
+function TransformStreamDefaultSinkCloseAlgorithm(stream) {
+    // stream._readable cannot change after construction, so caching it across a call to user code is safe.
+    const readable = stream._readable;
+    const controller = stream._transformStreamController;
+    const flushPromise = controller._flushAlgorithm();
+    TransformStreamDefaultControllerClearAlgorithms(controller);
+    // Return a promise that is fulfilled with undefined on success.
+    return transformPromiseWith(flushPromise, () => {
+        if (readable._state === 'errored') {
+            throw readable._storedError;
+        }
+        ReadableStreamDefaultControllerClose(readable._readableStreamController);
+    }, r => {
+        TransformStreamError(stream, r);
+        throw readable._storedError;
+    });
+}
+// TransformStreamDefaultSource Algorithms
+function TransformStreamDefaultSourcePullAlgorithm(stream) {
+    // Invariant. Enforced by the promises returned by start() and pull().
+    TransformStreamSetBackpressure(stream, false);
+    // Prevent the next pull() call until there is backpressure.
+    return stream._backpressureChangePromise;
+}
+// Helper functions for the TransformStreamDefaultController.
+function defaultControllerBrandCheckException(name) {
+    return new TypeError(`TransformStreamDefaultController.prototype.${name} can only be used on a TransformStreamDefaultController`);
+}
+// Helper functions for the TransformStream.
+function streamBrandCheckException(name) {
+    return new TypeError(`TransformStream.prototype.${name} can only be used on a TransformStream`);
+}
+
+const exports = {
+    ReadableStream,
+    ReadableStreamDefaultController,
+    ReadableByteStreamController,
+    ReadableStreamBYOBRequest,
+    ReadableStreamDefaultReader,
+    ReadableStreamBYOBReader,
+    WritableStream,
+    WritableStreamDefaultController,
+    WritableStreamDefaultWriter,
+    ByteLengthQueuingStrategy,
+    CountQueuingStrategy,
+    TransformStream,
+    TransformStreamDefaultController
+};
+// Add classes to global scope
+if (typeof globals !== 'undefined') {
+    for (const prop in exports) {
+        if (Object.prototype.hasOwnProperty.call(exports, prop)) {
+            Object.defineProperty(globals, prop, {
+                value: exports[prop],
+                writable: true,
+                configurable: true
+            });
+        }
+    }
+}
+
+export { ByteLengthQueuingStrategy, CountQueuingStrategy, ReadableByteStreamController, ReadableStream, ReadableStreamBYOBReader, ReadableStreamBYOBRequest, ReadableStreamDefaultController, ReadableStreamDefaultReader, TransformStream, TransformStreamDefaultController, WritableStream, WritableStreamDefaultController, WritableStreamDefaultWriter };
+//# sourceMappingURL=polyfill.es2018.mjs.map
diff --git a/node_modules/web-streams-polyfill/dist/polyfill.es2018.mjs.map b/node_modules/web-streams-polyfill/dist/polyfill.es2018.mjs.map
new file mode 100644
index 0000000..c6449f6
--- /dev/null
+++ b/node_modules/web-streams-polyfill/dist/polyfill.es2018.mjs.map
@@ -0,0 +1 @@
+{"version":3,"file":"polyfill.es2018.mjs","sources":["../src/stub/symbol.ts","../src/utils.ts","../src/lib/helpers/miscellaneous.ts","../src/lib/helpers/webidl.ts","../src/lib/simple-queue.ts","../src/lib/readable-stream/generic-reader.ts","../src/lib/abstract-ops/internal-methods.ts","../src/stub/number-isfinite.ts","../src/stub/math-trunc.ts","../src/lib/validators/basic.ts","../src/lib/validators/readable-stream.ts","../src/lib/readable-stream/default-reader.ts","../src/target/es2018/stub/async-iterator-prototype.ts","../src/lib/readable-stream/async-iterator.ts","../src/stub/number-isnan.ts","../src/lib/abstract-ops/ecmascript.ts","../src/lib/abstract-ops/miscellaneous.ts","../src/lib/abstract-ops/queue-with-sizes.ts","../src/lib/readable-stream/byte-stream-controller.ts","../src/lib/readable-stream/byob-reader.ts","../src/lib/abstract-ops/queuing-strategy.ts","../src/lib/validators/queuing-strategy.ts","../src/lib/validators/underlying-sink.ts","../src/lib/validators/writable-stream.ts","../src/lib/abort-signal.ts","../src/lib/writable-stream.ts","../src/stub/native.ts","../src/stub/dom-exception.ts","../src/lib/readable-stream/pipe.ts","../src/lib/readable-stream/default-controller.ts","../src/lib/readable-stream/tee.ts","../src/lib/validators/underlying-source.ts","../src/lib/validators/reader-options.ts","../src/lib/validators/iterator-options.ts","../src/lib/validators/pipe-options.ts","../src/lib/validators/readable-writable-pair.ts","../src/lib/readable-stream.ts","../src/lib/validators/queuing-strategy-init.ts","../src/lib/byte-length-queuing-strategy.ts","../src/lib/count-queuing-strategy.ts","../src/lib/validators/transformer.ts","../src/lib/transform-stream.ts","../src/polyfill.ts"],"sourcesContent":["/// <reference lib=\"es2015.symbol\" />\n\nconst SymbolPolyfill: (description?: string) => symbol =\n  typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol' ?\n    Symbol :\n    description => `Symbol(${description})` as any as symbol;\n\nexport default SymbolPolyfill;\n","/// <reference lib=\"dom\" />\n\nexport function noop(): undefined {\n  return undefined;\n}\n\nfunction getGlobals() {\n  if (typeof self !== 'undefined') {\n    return self;\n  } else if (typeof window !== 'undefined') {\n    return window;\n  } else if (typeof global !== 'undefined') {\n    return global;\n  }\n  return undefined;\n}\n\nexport const globals = getGlobals();\n","import { noop } from '../../utils';\nimport { AssertionError } from '../../stub/assert';\n\nexport function typeIsObject(x: any): x is object {\n  return (typeof x === 'object' && x !== null) || typeof x === 'function';\n}\n\nexport const rethrowAssertionErrorRejection: (e: any) => void =\n  DEBUG ? e => {\n    // Used throughout the reference implementation, as `.catch(rethrowAssertionErrorRejection)`, to ensure any errors\n    // get shown. There are places in the spec where we do promise transformations and purposefully ignore or don't\n    // expect any errors, but assertion errors are always problematic.\n    if (e && e instanceof AssertionError) {\n      setTimeout(() => {\n        throw e;\n      }, 0);\n    }\n  } : noop;\n","import { globals } from '../../utils';\nimport { rethrowAssertionErrorRejection } from './miscellaneous';\nimport assert from '../../stub/assert';\n\nconst originalPromise = Promise;\nconst originalPromiseThen = Promise.prototype.then;\nconst originalPromiseResolve = Promise.resolve.bind(originalPromise);\nconst originalPromiseReject = Promise.reject.bind(originalPromise);\n\nexport function newPromise<T>(executor: (\n  resolve: (value: T | PromiseLike<T>) => void,\n  reject: (reason?: any) => void\n) => void): Promise<T> {\n  return new originalPromise(executor);\n}\n\nexport function promiseResolvedWith<T>(value: T | PromiseLike<T>): Promise<T> {\n  return originalPromiseResolve(value);\n}\n\nexport function promiseRejectedWith<T = never>(reason: any): Promise<T> {\n  return originalPromiseReject(reason);\n}\n\nexport function PerformPromiseThen<T, TResult1 = T, TResult2 = never>(\n  promise: Promise<T>,\n  onFulfilled?: (value: T) => TResult1 | PromiseLike<TResult1>,\n  onRejected?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2> {\n  // There doesn't appear to be any way to correctly emulate the behaviour from JavaScript, so this is just an\n  // approximation.\n  return originalPromiseThen.call(promise, onFulfilled, onRejected) as Promise<TResult1 | TResult2>;\n}\n\nexport function uponPromise<T>(\n  promise: Promise<T>,\n  onFulfilled?: (value: T) => void | PromiseLike<void>,\n  onRejected?: (reason: any) => void | PromiseLike<void>): void {\n  PerformPromiseThen(\n    PerformPromiseThen(promise, onFulfilled, onRejected),\n    undefined,\n    rethrowAssertionErrorRejection\n  );\n}\n\nexport function uponFulfillment<T>(promise: Promise<T>, onFulfilled: (value: T) => void | PromiseLike<void>): void {\n  uponPromise(promise, onFulfilled);\n}\n\nexport function uponRejection(promise: Promise<unknown>, onRejected: (reason: any) => void | PromiseLike<void>): void {\n  uponPromise(promise, undefined, onRejected);\n}\n\nexport function transformPromiseWith<T, TResult1 = T, TResult2 = never>(\n  promise: Promise<T>,\n  fulfillmentHandler?: (value: T) => TResult1 | PromiseLike<TResult1>,\n  rejectionHandler?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2> {\n  return PerformPromiseThen(promise, fulfillmentHandler, rejectionHandler);\n}\n\nexport function setPromiseIsHandledToTrue(promise: Promise<unknown>): void {\n  PerformPromiseThen(promise, undefined, rethrowAssertionErrorRejection);\n}\n\nexport const queueMicrotask: (fn: () => void) => void = (() => {\n  const globalQueueMicrotask = globals && globals.queueMicrotask;\n  if (typeof globalQueueMicrotask === 'function') {\n    return globalQueueMicrotask;\n  }\n\n  const resolvedPromise = promiseResolvedWith(undefined);\n  return (fn: () => void) => PerformPromiseThen(resolvedPromise, fn);\n})();\n\nexport function reflectCall<T, A extends any[], R>(F: (this: T, ...fnArgs: A) => R, V: T, args: A): R {\n  if (typeof F !== 'function') {\n    throw new TypeError('Argument is not a function');\n  }\n  return Function.prototype.apply.call(F, V, args);\n}\n\nexport function promiseCall<T, A extends any[], R>(F: (this: T, ...fnArgs: A) => R | PromiseLike<R>,\n                                                   V: T,\n                                                   args: A): Promise<R> {\n  assert(typeof F === 'function');\n  assert(V !== undefined);\n  assert(Array.isArray(args));\n  try {\n    return promiseResolvedWith(reflectCall(F, V, args));\n  } catch (value) {\n    return promiseRejectedWith(value);\n  }\n}\n","import assert from '../stub/assert';\n\n// Original from Chromium\n// https://chromium.googlesource.com/chromium/src/+/0aee4434a4dba42a42abaea9bfbc0cd196a63bc1/third_party/blink/renderer/core/streams/SimpleQueue.js\n\nconst QUEUE_MAX_ARRAY_SIZE = 16384;\n\ninterface Node<T> {\n  _elements: T[];\n  _next: Node<T> | undefined;\n}\n\n/**\n * Simple queue structure.\n *\n * Avoids scalability issues with using a packed array directly by using\n * multiple arrays in a linked list and keeping the array size bounded.\n */\nexport class SimpleQueue<T> {\n  private _front: Node<T>;\n  private _back: Node<T>;\n  private _cursor = 0;\n  private _size = 0;\n\n  constructor() {\n    // _front and _back are always defined.\n    this._front = {\n      _elements: [],\n      _next: undefined\n    };\n    this._back = this._front;\n    // The cursor is used to avoid calling Array.shift().\n    // It contains the index of the front element of the array inside the\n    // front-most node. It is always in the range [0, QUEUE_MAX_ARRAY_SIZE).\n    this._cursor = 0;\n    // When there is only one node, size === elements.length - cursor.\n    this._size = 0;\n  }\n\n  get length(): number {\n    return this._size;\n  }\n\n  // For exception safety, this method is structured in order:\n  // 1. Read state\n  // 2. Calculate required state mutations\n  // 3. Perform state mutations\n  push(element: T): void {\n    const oldBack = this._back;\n    let newBack = oldBack;\n    assert(oldBack._next === undefined);\n    if (oldBack._elements.length === QUEUE_MAX_ARRAY_SIZE - 1) {\n      newBack = {\n        _elements: [],\n        _next: undefined\n      };\n    }\n\n    // push() is the mutation most likely to throw an exception, so it\n    // goes first.\n    oldBack._elements.push(element);\n    if (newBack !== oldBack) {\n      this._back = newBack;\n      oldBack._next = newBack;\n    }\n    ++this._size;\n  }\n\n  // Like push(), shift() follows the read -> calculate -> mutate pattern for\n  // exception safety.\n  shift(): T {\n    assert(this._size > 0); // must not be called on an empty queue\n\n    const oldFront = this._front;\n    let newFront = oldFront;\n    const oldCursor = this._cursor;\n    let newCursor = oldCursor + 1;\n\n    const elements = oldFront._elements;\n    const element = elements[oldCursor];\n\n    if (newCursor === QUEUE_MAX_ARRAY_SIZE) {\n      assert(elements.length === QUEUE_MAX_ARRAY_SIZE);\n      assert(oldFront._next !== undefined);\n      newFront = oldFront._next!;\n      newCursor = 0;\n    }\n\n    // No mutations before this point.\n    --this._size;\n    this._cursor = newCursor;\n    if (oldFront !== newFront) {\n      this._front = newFront;\n    }\n\n    // Permit shifted element to be garbage collected.\n    elements[oldCursor] = undefined!;\n\n    return element;\n  }\n\n  // The tricky thing about forEach() is that it can be called\n  // re-entrantly. The queue may be mutated inside the callback. It is easy to\n  // see that push() within the callback has no negative effects since the end\n  // of the queue is checked for on every iteration. If shift() is called\n  // repeatedly within the callback then the next iteration may return an\n  // element that has been removed. In this case the callback will be called\n  // with undefined values until we either \"catch up\" with elements that still\n  // exist or reach the back of the queue.\n  forEach(callback: (element: T) => void): void {\n    let i = this._cursor;\n    let node = this._front;\n    let elements = node._elements;\n    while (i !== elements.length || node._next !== undefined) {\n      if (i === elements.length) {\n        assert(node._next !== undefined);\n        assert(i === QUEUE_MAX_ARRAY_SIZE);\n        node = node._next!;\n        elements = node._elements;\n        i = 0;\n        if (elements.length === 0) {\n          break;\n        }\n      }\n      callback(elements[i]);\n      ++i;\n    }\n  }\n\n  // Return the element that would be returned if shift() was called now,\n  // without modifying the queue.\n  peek(): T {\n    assert(this._size > 0); // must not be called on an empty queue\n\n    const front = this._front;\n    const cursor = this._cursor;\n    return front._elements[cursor];\n  }\n}\n","import assert from '../../stub/assert';\nimport { ReadableStream, ReadableStreamCancel, ReadableStreamReader } from '../readable-stream';\nimport { newPromise, setPromiseIsHandledToTrue } from '../helpers/webidl';\n\nexport function ReadableStreamReaderGenericInitialize<R>(reader: ReadableStreamReader<R>, stream: ReadableStream<R>) {\n  reader._ownerReadableStream = stream;\n  stream._reader = reader;\n\n  if (stream._state === 'readable') {\n    defaultReaderClosedPromiseInitialize(reader);\n  } else if (stream._state === 'closed') {\n    defaultReaderClosedPromiseInitializeAsResolved(reader);\n  } else {\n    assert(stream._state === 'errored');\n\n    defaultReaderClosedPromiseInitializeAsRejected(reader, stream._storedError);\n  }\n}\n\n// A client of ReadableStreamDefaultReader and ReadableStreamBYOBReader may use these functions directly to bypass state\n// check.\n\nexport function ReadableStreamReaderGenericCancel(reader: ReadableStreamReader<any>, reason: any): Promise<undefined> {\n  const stream = reader._ownerReadableStream;\n  assert(stream !== undefined);\n  return ReadableStreamCancel(stream, reason);\n}\n\nexport function ReadableStreamReaderGenericRelease(reader: ReadableStreamReader<any>) {\n  assert(reader._ownerReadableStream !== undefined);\n  assert(reader._ownerReadableStream._reader === reader);\n\n  if (reader._ownerReadableStream._state === 'readable') {\n    defaultReaderClosedPromiseReject(\n      reader,\n      new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));\n  } else {\n    defaultReaderClosedPromiseResetToRejected(\n      reader,\n      new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));\n  }\n\n  reader._ownerReadableStream._reader = undefined;\n  reader._ownerReadableStream = undefined!;\n}\n\n// Helper functions for the readers.\n\nexport function readerLockException(name: string): TypeError {\n  return new TypeError('Cannot ' + name + ' a stream using a released reader');\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nexport function defaultReaderClosedPromiseInitialize(reader: ReadableStreamReader<any>) {\n  reader._closedPromise = newPromise((resolve, reject) => {\n    reader._closedPromise_resolve = resolve;\n    reader._closedPromise_reject = reject;\n  });\n}\n\nexport function defaultReaderClosedPromiseInitializeAsRejected(reader: ReadableStreamReader<any>, reason: any) {\n  defaultReaderClosedPromiseInitialize(reader);\n  defaultReaderClosedPromiseReject(reader, reason);\n}\n\nexport function defaultReaderClosedPromiseInitializeAsResolved(reader: ReadableStreamReader<any>) {\n  defaultReaderClosedPromiseInitialize(reader);\n  defaultReaderClosedPromiseResolve(reader);\n}\n\nexport function defaultReaderClosedPromiseReject(reader: ReadableStreamReader<any>, reason: any) {\n  if (reader._closedPromise_reject === undefined) {\n    return;\n  }\n\n  setPromiseIsHandledToTrue(reader._closedPromise);\n  reader._closedPromise_reject(reason);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n\nexport function defaultReaderClosedPromiseResetToRejected(reader: ReadableStreamReader<any>, reason: any) {\n  assert(reader._closedPromise_resolve === undefined);\n  assert(reader._closedPromise_reject === undefined);\n\n  defaultReaderClosedPromiseInitializeAsRejected(reader, reason);\n}\n\nexport function defaultReaderClosedPromiseResolve(reader: ReadableStreamReader<any>) {\n  if (reader._closedPromise_resolve === undefined) {\n    return;\n  }\n\n  reader._closedPromise_resolve(undefined);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n","export const AbortSteps = Symbol('[[AbortSteps]]');\nexport const ErrorSteps = Symbol('[[ErrorSteps]]');\nexport const CancelSteps = Symbol('[[CancelSteps]]');\nexport const PullSteps = Symbol('[[PullSteps]]');\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite#Polyfill\nconst NumberIsFinite: typeof Number.isFinite = Number.isFinite || function (x) {\n  return typeof x === 'number' && isFinite(x);\n};\n\nexport default NumberIsFinite;\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc#Polyfill\nconst MathTrunc: typeof Math.trunc = Math.trunc || function (v) {\n  return v < 0 ? Math.ceil(v) : Math.floor(v);\n};\n\nexport default MathTrunc;\n","import NumberIsFinite from '../../stub/number-isfinite';\nimport MathTrunc from '../../stub/math-trunc';\n\n// https://heycam.github.io/webidl/#idl-dictionaries\nexport function isDictionary(x: any): x is object | null {\n  return typeof x === 'object' || typeof x === 'function';\n}\n\nexport function assertDictionary(obj: unknown,\n                                 context: string): asserts obj is object | null | undefined {\n  if (obj !== undefined && !isDictionary(obj)) {\n    throw new TypeError(`${context} is not an object.`);\n  }\n}\n\nexport type AnyFunction = (...args: any[]) => any;\n\n// https://heycam.github.io/webidl/#idl-callback-functions\nexport function assertFunction(x: unknown, context: string): asserts x is AnyFunction {\n  if (typeof x !== 'function') {\n    throw new TypeError(`${context} is not a function.`);\n  }\n}\n\n// https://heycam.github.io/webidl/#idl-object\nexport function isObject(x: any): x is object {\n  return (typeof x === 'object' && x !== null) || typeof x === 'function';\n}\n\nexport function assertObject(x: unknown,\n                             context: string): asserts x is object {\n  if (!isObject(x)) {\n    throw new TypeError(`${context} is not an object.`);\n  }\n}\n\nexport function assertRequiredArgument<T extends any>(x: T | undefined,\n                                                      position: number,\n                                                      context: string): asserts x is T {\n  if (x === undefined) {\n    throw new TypeError(`Parameter ${position} is required in '${context}'.`);\n  }\n}\n\nexport function assertRequiredField<T extends any>(x: T | undefined,\n                                                   field: string,\n                                                   context: string): asserts x is T {\n  if (x === undefined) {\n    throw new TypeError(`${field} is required in '${context}'.`);\n  }\n}\n\n// https://heycam.github.io/webidl/#idl-unrestricted-double\nexport function convertUnrestrictedDouble(value: unknown): number {\n  return Number(value);\n}\n\nfunction censorNegativeZero(x: number): number {\n  return x === 0 ? 0 : x;\n}\n\nfunction integerPart(x: number): number {\n  return censorNegativeZero(MathTrunc(x));\n}\n\n// https://heycam.github.io/webidl/#idl-unsigned-long-long\nexport function convertUnsignedLongLongWithEnforceRange(value: unknown, context: string): number {\n  const lowerBound = 0;\n  const upperBound = Number.MAX_SAFE_INTEGER;\n\n  let x = Number(value);\n  x = censorNegativeZero(x);\n\n  if (!NumberIsFinite(x)) {\n    throw new TypeError(`${context} is not a finite number`);\n  }\n\n  x = integerPart(x);\n\n  if (x < lowerBound || x > upperBound) {\n    throw new TypeError(`${context} is outside the accepted range of ${lowerBound} to ${upperBound}, inclusive`);\n  }\n\n  if (!NumberIsFinite(x) || x === 0) {\n    return 0;\n  }\n\n  // TODO Use BigInt if supported?\n  // let xBigInt = BigInt(integerPart(x));\n  // xBigInt = BigInt.asUintN(64, xBigInt);\n  // return Number(xBigInt);\n\n  return x;\n}\n","import { IsReadableStream, ReadableStream } from '../readable-stream';\n\nexport function assertReadableStream(x: unknown, context: string): asserts x is ReadableStream {\n  if (!IsReadableStream(x)) {\n    throw new TypeError(`${context} is not a ReadableStream.`);\n  }\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericInitialize,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport { IsReadableStreamLocked, ReadableStream } from '../readable-stream';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { PullSteps } from '../abstract-ops/internal-methods';\nimport { newPromise, promiseRejectedWith } from '../helpers/webidl';\nimport { assertRequiredArgument } from '../validators/basic';\nimport { assertReadableStream } from '../validators/readable-stream';\n\n/**\n * A result returned by {@link ReadableStreamDefaultReader.read}.\n *\n * @public\n */\nexport type ReadableStreamDefaultReadResult<T> = {\n  done: false;\n  value: T;\n} | {\n  done: true;\n  value?: undefined;\n}\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamDefaultReader<R>(stream: ReadableStream): ReadableStreamDefaultReader<R> {\n  return new ReadableStreamDefaultReader(stream);\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamAddReadRequest<R>(stream: ReadableStream<R>,\n                                                readRequest: ReadRequest<R>): void {\n  assert(IsReadableStreamDefaultReader(stream._reader));\n  assert(stream._state === 'readable');\n\n  (stream._reader! as ReadableStreamDefaultReader<R>)._readRequests.push(readRequest);\n}\n\nexport function ReadableStreamFulfillReadRequest<R>(stream: ReadableStream<R>, chunk: R | undefined, done: boolean) {\n  const reader = stream._reader as ReadableStreamDefaultReader<R>;\n\n  assert(reader._readRequests.length > 0);\n\n  const readRequest = reader._readRequests.shift()!;\n  if (done) {\n    readRequest._closeSteps();\n  } else {\n    readRequest._chunkSteps(chunk!);\n  }\n}\n\nexport function ReadableStreamGetNumReadRequests<R>(stream: ReadableStream<R>): number {\n  return (stream._reader as ReadableStreamDefaultReader<R>)._readRequests.length;\n}\n\nexport function ReadableStreamHasDefaultReader(stream: ReadableStream): boolean {\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return false;\n  }\n\n  if (!IsReadableStreamDefaultReader(reader)) {\n    return false;\n  }\n\n  return true;\n}\n\n// Readers\n\nexport interface ReadRequest<R> {\n  _chunkSteps(chunk: R): void;\n\n  _closeSteps(): void;\n\n  _errorSteps(e: any): void;\n}\n\n/**\n * A default reader vended by a {@link ReadableStream}.\n *\n * @public\n */\nexport class ReadableStreamDefaultReader<R = any> {\n  /** @internal */\n  _ownerReadableStream!: ReadableStream<R>;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readRequests: SimpleQueue<ReadRequest<R>>;\n\n  constructor(stream: ReadableStream<R>) {\n    assertRequiredArgument(stream, 1, 'ReadableStreamDefaultReader');\n    assertReadableStream(stream, 'First parameter');\n\n    if (IsReadableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n    }\n\n    ReadableStreamReaderGenericInitialize(this, stream);\n\n    this._readRequests = new SimpleQueue();\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed,\n   * or rejected if the stream ever errors or the reader's lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('cancel'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('cancel'));\n    }\n\n    return ReadableStreamReaderGenericCancel(this, reason);\n  }\n\n  /**\n   * Returns a promise that allows access to the next chunk from the stream's internal queue, if available.\n   *\n   * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.\n   */\n  read(): Promise<ReadableStreamDefaultReadResult<R>> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('read'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('read from'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamDefaultReadResult<R>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamDefaultReadResult<R>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),\n      _closeSteps: () => resolvePromise({ value: undefined, done: true }),\n      _errorSteps: e => rejectPromise(e)\n    };\n    ReadableStreamDefaultReaderRead(this, readRequest);\n    return promise;\n  }\n\n  /**\n   * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.\n   * If the associated stream is errored when the lock is released, the reader will appear errored in the same way\n   * from now on; otherwise, the reader will appear closed.\n   *\n   * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by\n   * the reader's {@link ReadableStreamDefaultReader.read | read()} method has not yet been settled. Attempting to\n   * do so will throw a `TypeError` and leave the reader locked to the stream.\n   */\n  releaseLock(): void {\n    if (!IsReadableStreamDefaultReader(this)) {\n      throw defaultReaderBrandCheckException('releaseLock');\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return;\n    }\n\n    if (this._readRequests.length > 0) {\n      throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n    }\n\n    ReadableStreamReaderGenericRelease(this);\n  }\n}\n\nObject.defineProperties(ReadableStreamDefaultReader.prototype, {\n  cancel: { enumerable: true },\n  read: { enumerable: true },\n  releaseLock: { enumerable: true },\n  closed: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamDefaultReader.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamDefaultReader',\n    configurable: true\n  });\n}\n\n// Abstract operations for the readers.\n\nexport function IsReadableStreamDefaultReader<R = any>(x: any): x is ReadableStreamDefaultReader<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readRequests')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamDefaultReader;\n}\n\nexport function ReadableStreamDefaultReaderRead<R>(reader: ReadableStreamDefaultReader<R>,\n                                                   readRequest: ReadRequest<R>): void {\n  const stream = reader._ownerReadableStream;\n\n  assert(stream !== undefined);\n\n  stream._disturbed = true;\n\n  if (stream._state === 'closed') {\n    readRequest._closeSteps();\n  } else if (stream._state === 'errored') {\n    readRequest._errorSteps(stream._storedError);\n  } else {\n    assert(stream._state === 'readable');\n    stream._readableStreamController[PullSteps](readRequest as ReadRequest<any>);\n  }\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nfunction defaultReaderBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamDefaultReader.prototype.${name} can only be used on a ReadableStreamDefaultReader`);\n}\n","/// <reference lib=\"es2018.asynciterable\" />\n\n/* eslint-disable @typescript-eslint/no-empty-function */\nexport const AsyncIteratorPrototype: AsyncIterable<any> | undefined =\n  Object.getPrototypeOf(Object.getPrototypeOf(async function* (): AsyncIterableIterator<any> {}).prototype);\n","/// <reference lib=\"es2018.asynciterable\" />\n\nimport { ReadableStream } from '../readable-stream';\nimport {\n  AcquireReadableStreamDefaultReader,\n  ReadableStreamDefaultReader,\n  ReadableStreamDefaultReaderRead,\n  ReadableStreamDefaultReadResult,\n  ReadRequest\n} from './default-reader';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport assert from '../../stub/assert';\nimport { AsyncIteratorPrototype } from '@@target/stub/async-iterator-prototype';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport {\n  newPromise,\n  promiseRejectedWith,\n  promiseResolvedWith,\n  queueMicrotask,\n  transformPromiseWith\n} from '../helpers/webidl';\n\n/**\n * An async iterator returned by {@link ReadableStream.values}.\n *\n * @public\n */\nexport interface ReadableStreamAsyncIterator<R> extends AsyncIterator<R> {\n  next(): Promise<IteratorResult<R, undefined>>;\n\n  return(value?: any): Promise<IteratorResult<any>>;\n}\n\nexport class ReadableStreamAsyncIteratorImpl<R> {\n  private readonly _reader: ReadableStreamDefaultReader<R>;\n  private readonly _preventCancel: boolean;\n  private _ongoingPromise: Promise<ReadableStreamDefaultReadResult<R>> | undefined = undefined;\n  private _isFinished = false;\n\n  constructor(reader: ReadableStreamDefaultReader<R>, preventCancel: boolean) {\n    this._reader = reader;\n    this._preventCancel = preventCancel;\n  }\n\n  next(): Promise<ReadableStreamDefaultReadResult<R>> {\n    const nextSteps = () => this._nextSteps();\n    this._ongoingPromise = this._ongoingPromise ?\n      transformPromiseWith(this._ongoingPromise, nextSteps, nextSteps) :\n      nextSteps();\n    return this._ongoingPromise;\n  }\n\n  return(value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    const returnSteps = () => this._returnSteps(value);\n    return this._ongoingPromise ?\n      transformPromiseWith(this._ongoingPromise, returnSteps, returnSteps) :\n      returnSteps();\n  }\n\n  private _nextSteps(): Promise<ReadableStreamDefaultReadResult<R>> {\n    if (this._isFinished) {\n      return Promise.resolve({ value: undefined, done: true });\n    }\n\n    const reader = this._reader;\n    if (reader._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('iterate'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamDefaultReadResult<R>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamDefaultReadResult<R>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => {\n        this._ongoingPromise = undefined;\n        // This needs to be delayed by one microtask, otherwise we stop pulling too early which breaks a test.\n        // FIXME Is this a bug in the specification, or in the test?\n        queueMicrotask(() => resolvePromise({ value: chunk, done: false }));\n      },\n      _closeSteps: () => {\n        this._ongoingPromise = undefined;\n        this._isFinished = true;\n        ReadableStreamReaderGenericRelease(reader);\n        resolvePromise({ value: undefined, done: true });\n      },\n      _errorSteps: reason => {\n        this._ongoingPromise = undefined;\n        this._isFinished = true;\n        ReadableStreamReaderGenericRelease(reader);\n        rejectPromise(reason);\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n    return promise;\n  }\n\n  private _returnSteps(value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (this._isFinished) {\n      return Promise.resolve({ value, done: true });\n    }\n    this._isFinished = true;\n\n    const reader = this._reader;\n    if (reader._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('finish iterating'));\n    }\n\n    assert(reader._readRequests.length === 0);\n\n    if (!this._preventCancel) {\n      const result = ReadableStreamReaderGenericCancel(reader, value);\n      ReadableStreamReaderGenericRelease(reader);\n      return transformPromiseWith(result, () => ({ value, done: true }));\n    }\n\n    ReadableStreamReaderGenericRelease(reader);\n    return promiseResolvedWith({ value, done: true });\n  }\n}\n\ndeclare class ReadableStreamAsyncIteratorInstance<R> implements ReadableStreamAsyncIterator<R> {\n  /** @interal */\n  _asyncIteratorImpl: ReadableStreamAsyncIteratorImpl<R>;\n\n  next(): Promise<IteratorResult<R, undefined>>;\n\n  return(value?: any): Promise<IteratorResult<any>>;\n}\n\nconst ReadableStreamAsyncIteratorPrototype: ReadableStreamAsyncIteratorInstance<any> = {\n  next(this: ReadableStreamAsyncIteratorInstance<any>): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (!IsReadableStreamAsyncIterator(this)) {\n      return promiseRejectedWith(streamAsyncIteratorBrandCheckException('next'));\n    }\n    return this._asyncIteratorImpl.next();\n  },\n\n  return(this: ReadableStreamAsyncIteratorInstance<any>, value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (!IsReadableStreamAsyncIterator(this)) {\n      return promiseRejectedWith(streamAsyncIteratorBrandCheckException('return'));\n    }\n    return this._asyncIteratorImpl.return(value);\n  }\n} as any;\nif (AsyncIteratorPrototype !== undefined) {\n  Object.setPrototypeOf(ReadableStreamAsyncIteratorPrototype, AsyncIteratorPrototype);\n}\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamAsyncIterator<R>(stream: ReadableStream<R>,\n                                                      preventCancel: boolean): ReadableStreamAsyncIterator<R> {\n  const reader = AcquireReadableStreamDefaultReader<R>(stream);\n  const impl = new ReadableStreamAsyncIteratorImpl(reader, preventCancel);\n  const iterator: ReadableStreamAsyncIteratorInstance<R> = Object.create(ReadableStreamAsyncIteratorPrototype);\n  iterator._asyncIteratorImpl = impl;\n  return iterator;\n}\n\nfunction IsReadableStreamAsyncIterator<R = any>(x: any): x is ReadableStreamAsyncIterator<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_asyncIteratorImpl')) {\n    return false;\n  }\n\n  try {\n    // noinspection SuspiciousTypeOfGuard\n    return (x as ReadableStreamAsyncIteratorInstance<any>)._asyncIteratorImpl instanceof\n      ReadableStreamAsyncIteratorImpl;\n  } catch {\n    return false;\n  }\n}\n\n// Helper functions for the ReadableStream.\n\nfunction streamAsyncIteratorBrandCheckException(name: string): TypeError {\n  return new TypeError(`ReadableStreamAsyncIterator.${name} can only be used on a ReadableSteamAsyncIterator`);\n}\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Polyfill\nconst NumberIsNaN: typeof Number.isNaN = Number.isNaN || function (x) {\n  // eslint-disable-next-line no-self-compare\n  return x !== x;\n};\n\nexport default NumberIsNaN;\n","export function CreateArrayFromList<T extends any[]>(elements: T): T {\n  // We use arrays to represent lists, so this is basically a no-op.\n  // Do a slice though just in case we happen to depend on the unique-ness.\n  return elements.slice() as T;\n}\n\nexport function CopyDataBlockBytes(dest: ArrayBuffer,\n                                   destOffset: number,\n                                   src: ArrayBuffer,\n                                   srcOffset: number,\n                                   n: number) {\n  new Uint8Array(dest).set(new Uint8Array(src, srcOffset, n), destOffset);\n}\n\n// Not implemented correctly\nexport function TransferArrayBuffer<T extends ArrayBufferLike>(O: T): T {\n  return O;\n}\n\n// Not implemented correctly\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nexport function CanTransferArrayBuffer(O: ArrayBufferLike): boolean {\n  return true;\n}\n\n// Not implemented correctly\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nexport function IsDetachedBuffer(O: ArrayBufferLike): boolean {\n  return false;\n}\n\nexport function ArrayBufferSlice(buffer: ArrayBufferLike, begin: number, end: number): ArrayBufferLike {\n  // ArrayBuffer.prototype.slice is not available on IE10\n  // https://www.caniuse.com/mdn-javascript_builtins_arraybuffer_slice\n  if (buffer.slice) {\n    return buffer.slice(begin, end);\n  }\n  const length = end - begin;\n  const slice = new ArrayBuffer(length);\n  CopyDataBlockBytes(slice, 0, buffer, begin, length);\n  return slice;\n}\n","import NumberIsNaN from '../../stub/number-isnan';\nimport { ArrayBufferSlice } from './ecmascript';\n\nexport function IsNonNegativeNumber(v: number): boolean {\n  if (typeof v !== 'number') {\n    return false;\n  }\n\n  if (NumberIsNaN(v)) {\n    return false;\n  }\n\n  if (v < 0) {\n    return false;\n  }\n\n  return true;\n}\n\nexport function CloneAsUint8Array(O: ArrayBufferView): Uint8Array {\n  const buffer = ArrayBufferSlice(O.buffer, O.byteOffset, O.byteOffset + O.byteLength);\n  return new Uint8Array(buffer);\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport { IsNonNegativeNumber } from './miscellaneous';\n\nexport interface QueueContainer<T> {\n  _queue: SimpleQueue<T>;\n  _queueTotalSize: number;\n}\n\nexport interface QueuePair<T> {\n  value: T;\n  size: number;\n}\n\nexport function DequeueValue<T>(container: QueueContainer<QueuePair<T>>): T {\n  assert('_queue' in container && '_queueTotalSize' in container);\n  assert(container._queue.length > 0);\n\n  const pair = container._queue.shift()!;\n  container._queueTotalSize -= pair.size;\n  if (container._queueTotalSize < 0) {\n    container._queueTotalSize = 0;\n  }\n\n  return pair.value;\n}\n\nexport function EnqueueValueWithSize<T>(container: QueueContainer<QueuePair<T>>, value: T, size: number) {\n  assert('_queue' in container && '_queueTotalSize' in container);\n\n  if (!IsNonNegativeNumber(size) || size === Infinity) {\n    throw new RangeError('Size must be a finite, non-NaN, non-negative number.');\n  }\n\n  container._queue.push({ value, size });\n  container._queueTotalSize += size;\n}\n\nexport function PeekQueueValue<T>(container: QueueContainer<QueuePair<T>>): T {\n  assert('_queue' in container && '_queueTotalSize' in container);\n  assert(container._queue.length > 0);\n\n  const pair = container._queue.peek();\n  return pair.value;\n}\n\nexport function ResetQueue<T>(container: QueueContainer<T>) {\n  assert('_queue' in container && '_queueTotalSize' in container);\n\n  container._queue = new SimpleQueue<T>();\n  container._queueTotalSize = 0;\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport { ResetQueue } from '../abstract-ops/queue-with-sizes';\nimport {\n  ReadableStreamAddReadRequest,\n  ReadableStreamFulfillReadRequest,\n  ReadableStreamGetNumReadRequests,\n  ReadableStreamHasDefaultReader,\n  ReadRequest\n} from './default-reader';\nimport {\n  ReadableStreamAddReadIntoRequest,\n  ReadableStreamFulfillReadIntoRequest,\n  ReadableStreamGetNumReadIntoRequests,\n  ReadableStreamHasBYOBReader,\n  ReadIntoRequest\n} from './byob-reader';\nimport NumberIsInteger from '../../stub/number-isinteger';\nimport {\n  IsReadableStreamLocked,\n  ReadableByteStream,\n  ReadableStreamClose,\n  ReadableStreamError\n} from '../readable-stream';\nimport { ValidatedUnderlyingByteSource } from './underlying-source';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport {\n  ArrayBufferSlice,\n  CanTransferArrayBuffer,\n  CopyDataBlockBytes,\n  IsDetachedBuffer,\n  TransferArrayBuffer\n} from '../abstract-ops/ecmascript';\nimport { CancelSteps, PullSteps } from '../abstract-ops/internal-methods';\nimport { promiseResolvedWith, uponPromise } from '../helpers/webidl';\nimport { assertRequiredArgument, convertUnsignedLongLongWithEnforceRange } from '../validators/basic';\n\n/**\n * A pull-into request in a {@link ReadableByteStreamController}.\n *\n * @public\n */\nexport class ReadableStreamBYOBRequest {\n  /** @internal */\n  _associatedReadableByteStreamController!: ReadableByteStreamController;\n  /** @internal */\n  _view!: ArrayBufferView | null;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the view for writing in to, or `null` if the BYOB request has already been responded to.\n   */\n  get view(): ArrayBufferView | null {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('view');\n    }\n\n    return this._view;\n  }\n\n  /**\n   * Indicates to the associated readable byte stream that `bytesWritten` bytes were written into\n   * {@link ReadableStreamBYOBRequest.view | view}, causing the result be surfaced to the consumer.\n   *\n   * After this method is called, {@link ReadableStreamBYOBRequest.view | view} will be transferred and no longer\n   * modifiable.\n   */\n  respond(bytesWritten: number): void;\n  respond(bytesWritten: number | undefined): void {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('respond');\n    }\n    assertRequiredArgument(bytesWritten, 1, 'respond');\n    bytesWritten = convertUnsignedLongLongWithEnforceRange(bytesWritten, 'First parameter');\n\n    if (this._associatedReadableByteStreamController === undefined) {\n      throw new TypeError('This BYOB request has been invalidated');\n    }\n\n    if (IsDetachedBuffer(this._view!.buffer)) {\n      throw new TypeError(`The BYOB request's buffer has been detached and so cannot be used as a response`);\n    }\n\n    assert(this._view!.byteLength > 0);\n    assert(this._view!.buffer.byteLength > 0);\n\n    ReadableByteStreamControllerRespond(this._associatedReadableByteStreamController, bytesWritten);\n  }\n\n  /**\n   * Indicates to the associated readable byte stream that instead of writing into\n   * {@link ReadableStreamBYOBRequest.view | view}, the underlying byte source is providing a new `ArrayBufferView`,\n   * which will be given to the consumer of the readable byte stream.\n   *\n   * After this method is called, `view` will be transferred and no longer modifiable.\n   */\n  respondWithNewView(view: ArrayBufferView): void;\n  respondWithNewView(view: ArrayBufferView | undefined): void {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('respondWithNewView');\n    }\n    assertRequiredArgument(view, 1, 'respondWithNewView');\n\n    if (!ArrayBuffer.isView(view)) {\n      throw new TypeError('You can only respond with array buffer views');\n    }\n\n    if (this._associatedReadableByteStreamController === undefined) {\n      throw new TypeError('This BYOB request has been invalidated');\n    }\n\n    if (IsDetachedBuffer(view.buffer)) {\n      throw new TypeError('The given view\\'s buffer has been detached and so cannot be used as a response');\n    }\n\n    ReadableByteStreamControllerRespondWithNewView(this._associatedReadableByteStreamController, view);\n  }\n}\n\nObject.defineProperties(ReadableStreamBYOBRequest.prototype, {\n  respond: { enumerable: true },\n  respondWithNewView: { enumerable: true },\n  view: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamBYOBRequest.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamBYOBRequest',\n    configurable: true\n  });\n}\n\ninterface ArrayBufferViewConstructor<T extends ArrayBufferView = ArrayBufferView> {\n  new(buffer: ArrayBufferLike, byteOffset: number, length?: number): T;\n\n  readonly prototype: T;\n  readonly BYTES_PER_ELEMENT: number;\n}\n\ninterface ByteQueueElement {\n  buffer: ArrayBufferLike;\n  byteOffset: number;\n  byteLength: number;\n}\n\ntype PullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> =\n  DefaultPullIntoDescriptor\n  | BYOBPullIntoDescriptor<T>;\n\ninterface DefaultPullIntoDescriptor {\n  buffer: ArrayBufferLike;\n  bufferByteLength: number;\n  byteOffset: number;\n  byteLength: number;\n  bytesFilled: number;\n  elementSize: number;\n  viewConstructor: ArrayBufferViewConstructor<Uint8Array>;\n  readerType: 'default';\n}\n\ninterface BYOBPullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> {\n  buffer: ArrayBufferLike;\n  bufferByteLength: number;\n  byteOffset: number;\n  byteLength: number;\n  bytesFilled: number;\n  elementSize: number;\n  viewConstructor: ArrayBufferViewConstructor<T>;\n  readerType: 'byob';\n}\n\n/**\n * Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue.\n *\n * @public\n */\nexport class ReadableByteStreamController {\n  /** @internal */\n  _controlledReadableByteStream!: ReadableByteStream;\n  /** @internal */\n  _queue!: SimpleQueue<ByteQueueElement>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _closeRequested!: boolean;\n  /** @internal */\n  _pullAgain!: boolean;\n  /** @internal */\n  _pulling !: boolean;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _pullAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _cancelAlgorithm!: (reason: any) => Promise<void>;\n  /** @internal */\n  _autoAllocateChunkSize: number | undefined;\n  /** @internal */\n  _byobRequest: ReadableStreamBYOBRequest | null;\n  /** @internal */\n  _pendingPullIntos!: SimpleQueue<PullIntoDescriptor>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the current BYOB pull request, or `null` if there isn't one.\n   */\n  get byobRequest(): ReadableStreamBYOBRequest | null {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('byobRequest');\n    }\n\n    return ReadableByteStreamControllerGetBYOBRequest(this);\n  }\n\n  /**\n   * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is\n   * over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure.\n   */\n  get desiredSize(): number | null {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('desiredSize');\n    }\n\n    return ReadableByteStreamControllerGetDesiredSize(this);\n  }\n\n  /**\n   * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from\n   * the stream, but once those are read, the stream will become closed.\n   */\n  close(): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('close');\n    }\n\n    if (this._closeRequested) {\n      throw new TypeError('The stream has already been closed; do not close it again!');\n    }\n\n    const state = this._controlledReadableByteStream._state;\n    if (state !== 'readable') {\n      throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be closed`);\n    }\n\n    ReadableByteStreamControllerClose(this);\n  }\n\n  /**\n   * Enqueues the given chunk chunk in the controlled readable stream.\n   * The chunk has to be an `ArrayBufferView` instance, or else a `TypeError` will be thrown.\n   */\n  enqueue(chunk: ArrayBufferView): void;\n  enqueue(chunk: ArrayBufferView | undefined): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('enqueue');\n    }\n\n    assertRequiredArgument(chunk, 1, 'enqueue');\n    if (!ArrayBuffer.isView(chunk)) {\n      throw new TypeError('chunk must be an array buffer view');\n    }\n    if (chunk.byteLength === 0) {\n      throw new TypeError('chunk must have non-zero byteLength');\n    }\n    if (chunk.buffer.byteLength === 0) {\n      throw new TypeError(`chunk's buffer must have non-zero byteLength`);\n    }\n\n    if (this._closeRequested) {\n      throw new TypeError('stream is closed or draining');\n    }\n\n    const state = this._controlledReadableByteStream._state;\n    if (state !== 'readable') {\n      throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be enqueued to`);\n    }\n\n    ReadableByteStreamControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.\n   */\n  error(e: any = undefined): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('error');\n    }\n\n    ReadableByteStreamControllerError(this, e);\n  }\n\n  /** @internal */\n  [CancelSteps](reason: any): Promise<void> {\n    ReadableByteStreamControllerClearPendingPullIntos(this);\n\n    ResetQueue(this);\n\n    const result = this._cancelAlgorithm(reason);\n    ReadableByteStreamControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [PullSteps](readRequest: ReadRequest<Uint8Array>): void {\n    const stream = this._controlledReadableByteStream;\n    assert(ReadableStreamHasDefaultReader(stream));\n\n    if (this._queueTotalSize > 0) {\n      assert(ReadableStreamGetNumReadRequests(stream) === 0);\n\n      const entry = this._queue.shift()!;\n      this._queueTotalSize -= entry.byteLength;\n\n      ReadableByteStreamControllerHandleQueueDrain(this);\n\n      const view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);\n\n      readRequest._chunkSteps(view);\n      return;\n    }\n\n    const autoAllocateChunkSize = this._autoAllocateChunkSize;\n    if (autoAllocateChunkSize !== undefined) {\n      let buffer: ArrayBuffer;\n      try {\n        buffer = new ArrayBuffer(autoAllocateChunkSize);\n      } catch (bufferE) {\n        readRequest._errorSteps(bufferE);\n        return;\n      }\n\n      const pullIntoDescriptor: DefaultPullIntoDescriptor = {\n        buffer,\n        bufferByteLength: autoAllocateChunkSize,\n        byteOffset: 0,\n        byteLength: autoAllocateChunkSize,\n        bytesFilled: 0,\n        elementSize: 1,\n        viewConstructor: Uint8Array,\n        readerType: 'default'\n      };\n\n      this._pendingPullIntos.push(pullIntoDescriptor);\n    }\n\n    ReadableStreamAddReadRequest(stream, readRequest);\n    ReadableByteStreamControllerCallPullIfNeeded(this);\n  }\n}\n\nObject.defineProperties(ReadableByteStreamController.prototype, {\n  close: { enumerable: true },\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  byobRequest: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableByteStreamController.prototype, Symbol.toStringTag, {\n    value: 'ReadableByteStreamController',\n    configurable: true\n  });\n}\n\n// Abstract operations for the ReadableByteStreamController.\n\nexport function IsReadableByteStreamController(x: any): x is ReadableByteStreamController {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableByteStream')) {\n    return false;\n  }\n\n  return x instanceof ReadableByteStreamController;\n}\n\nfunction IsReadableStreamBYOBRequest(x: any): x is ReadableStreamBYOBRequest {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_associatedReadableByteStreamController')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamBYOBRequest;\n}\n\nfunction ReadableByteStreamControllerCallPullIfNeeded(controller: ReadableByteStreamController): void {\n  const shouldPull = ReadableByteStreamControllerShouldCallPull(controller);\n  if (!shouldPull) {\n    return;\n  }\n\n  if (controller._pulling) {\n    controller._pullAgain = true;\n    return;\n  }\n\n  assert(!controller._pullAgain);\n\n  controller._pulling = true;\n\n  // TODO: Test controller argument\n  const pullPromise = controller._pullAlgorithm();\n  uponPromise(\n    pullPromise,\n    () => {\n      controller._pulling = false;\n\n      if (controller._pullAgain) {\n        controller._pullAgain = false;\n        ReadableByteStreamControllerCallPullIfNeeded(controller);\n      }\n    },\n    e => {\n      ReadableByteStreamControllerError(controller, e);\n    }\n  );\n}\n\nfunction ReadableByteStreamControllerClearPendingPullIntos(controller: ReadableByteStreamController) {\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n  controller._pendingPullIntos = new SimpleQueue();\n}\n\nfunction ReadableByteStreamControllerCommitPullIntoDescriptor<T extends ArrayBufferView>(\n  stream: ReadableByteStream,\n  pullIntoDescriptor: PullIntoDescriptor<T>\n) {\n  assert(stream._state !== 'errored');\n\n  let done = false;\n  if (stream._state === 'closed') {\n    assert(pullIntoDescriptor.bytesFilled === 0);\n    done = true;\n  }\n\n  const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);\n  if (pullIntoDescriptor.readerType === 'default') {\n    ReadableStreamFulfillReadRequest(stream, filledView as unknown as Uint8Array, done);\n  } else {\n    assert(pullIntoDescriptor.readerType === 'byob');\n    ReadableStreamFulfillReadIntoRequest(stream, filledView, done);\n  }\n}\n\nfunction ReadableByteStreamControllerConvertPullIntoDescriptor<T extends ArrayBufferView>(\n  pullIntoDescriptor: PullIntoDescriptor<T>\n): T {\n  const bytesFilled = pullIntoDescriptor.bytesFilled;\n  const elementSize = pullIntoDescriptor.elementSize;\n\n  assert(bytesFilled <= pullIntoDescriptor.byteLength);\n  assert(bytesFilled % elementSize === 0);\n\n  return new pullIntoDescriptor.viewConstructor(\n    pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize) as T;\n}\n\nfunction ReadableByteStreamControllerEnqueueChunkToQueue(controller: ReadableByteStreamController,\n                                                         buffer: ArrayBufferLike,\n                                                         byteOffset: number,\n                                                         byteLength: number) {\n  controller._queue.push({ buffer, byteOffset, byteLength });\n  controller._queueTotalSize += byteLength;\n}\n\nfunction ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller: ReadableByteStreamController,\n                                                                     pullIntoDescriptor: PullIntoDescriptor) {\n  const elementSize = pullIntoDescriptor.elementSize;\n\n  const currentAlignedBytes = pullIntoDescriptor.bytesFilled - pullIntoDescriptor.bytesFilled % elementSize;\n\n  const maxBytesToCopy = Math.min(controller._queueTotalSize,\n                                  pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled);\n  const maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;\n  const maxAlignedBytes = maxBytesFilled - maxBytesFilled % elementSize;\n\n  let totalBytesToCopyRemaining = maxBytesToCopy;\n  let ready = false;\n  if (maxAlignedBytes > currentAlignedBytes) {\n    totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled;\n    ready = true;\n  }\n\n  const queue = controller._queue;\n\n  while (totalBytesToCopyRemaining > 0) {\n    const headOfQueue = queue.peek();\n\n    const bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength);\n\n    const destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n    CopyDataBlockBytes(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy);\n\n    if (headOfQueue.byteLength === bytesToCopy) {\n      queue.shift();\n    } else {\n      headOfQueue.byteOffset += bytesToCopy;\n      headOfQueue.byteLength -= bytesToCopy;\n    }\n    controller._queueTotalSize -= bytesToCopy;\n\n    ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor);\n\n    totalBytesToCopyRemaining -= bytesToCopy;\n  }\n\n  if (!ready) {\n    assert(controller._queueTotalSize === 0);\n    assert(pullIntoDescriptor.bytesFilled > 0);\n    assert(pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize);\n  }\n\n  return ready;\n}\n\nfunction ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller: ReadableByteStreamController,\n                                                                size: number,\n                                                                pullIntoDescriptor: PullIntoDescriptor) {\n  assert(controller._pendingPullIntos.length === 0 || controller._pendingPullIntos.peek() === pullIntoDescriptor);\n  assert(controller._byobRequest === null);\n  pullIntoDescriptor.bytesFilled += size;\n}\n\nfunction ReadableByteStreamControllerHandleQueueDrain(controller: ReadableByteStreamController) {\n  assert(controller._controlledReadableByteStream._state === 'readable');\n\n  if (controller._queueTotalSize === 0 && controller._closeRequested) {\n    ReadableByteStreamControllerClearAlgorithms(controller);\n    ReadableStreamClose(controller._controlledReadableByteStream);\n  } else {\n    ReadableByteStreamControllerCallPullIfNeeded(controller);\n  }\n}\n\nfunction ReadableByteStreamControllerInvalidateBYOBRequest(controller: ReadableByteStreamController) {\n  if (controller._byobRequest === null) {\n    return;\n  }\n\n  controller._byobRequest._associatedReadableByteStreamController = undefined!;\n  controller._byobRequest._view = null!;\n  controller._byobRequest = null;\n}\n\nfunction ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller: ReadableByteStreamController) {\n  assert(!controller._closeRequested);\n\n  while (controller._pendingPullIntos.length > 0) {\n    if (controller._queueTotalSize === 0) {\n      return;\n    }\n\n    const pullIntoDescriptor = controller._pendingPullIntos.peek();\n\n    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {\n      ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n      ReadableByteStreamControllerCommitPullIntoDescriptor(\n        controller._controlledReadableByteStream,\n        pullIntoDescriptor\n      );\n    }\n  }\n}\n\nexport function ReadableByteStreamControllerPullInto<T extends ArrayBufferView>(\n  controller: ReadableByteStreamController,\n  view: T,\n  readIntoRequest: ReadIntoRequest<T>\n): void {\n  const stream = controller._controlledReadableByteStream;\n\n  let elementSize = 1;\n  if (view.constructor !== DataView) {\n    elementSize = (view.constructor as ArrayBufferViewConstructor<T>).BYTES_PER_ELEMENT;\n  }\n\n  const ctor = view.constructor as ArrayBufferViewConstructor<T>;\n\n  // try {\n  const buffer = TransferArrayBuffer(view.buffer);\n  // } catch (e) {\n  //   readIntoRequest._errorSteps(e);\n  //   return;\n  // }\n\n  const pullIntoDescriptor: BYOBPullIntoDescriptor<T> = {\n    buffer,\n    bufferByteLength: buffer.byteLength,\n    byteOffset: view.byteOffset,\n    byteLength: view.byteLength,\n    bytesFilled: 0,\n    elementSize,\n    viewConstructor: ctor,\n    readerType: 'byob'\n  };\n\n  if (controller._pendingPullIntos.length > 0) {\n    controller._pendingPullIntos.push(pullIntoDescriptor);\n\n    // No ReadableByteStreamControllerCallPullIfNeeded() call since:\n    // - No change happens on desiredSize\n    // - The source has already been notified of that there's at least 1 pending read(view)\n\n    ReadableStreamAddReadIntoRequest(stream, readIntoRequest);\n    return;\n  }\n\n  if (stream._state === 'closed') {\n    const emptyView = new ctor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0);\n    readIntoRequest._closeSteps(emptyView);\n    return;\n  }\n\n  if (controller._queueTotalSize > 0) {\n    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {\n      const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);\n\n      ReadableByteStreamControllerHandleQueueDrain(controller);\n\n      readIntoRequest._chunkSteps(filledView);\n      return;\n    }\n\n    if (controller._closeRequested) {\n      const e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n      ReadableByteStreamControllerError(controller, e);\n\n      readIntoRequest._errorSteps(e);\n      return;\n    }\n  }\n\n  controller._pendingPullIntos.push(pullIntoDescriptor);\n\n  ReadableStreamAddReadIntoRequest<T>(stream, readIntoRequest);\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nfunction ReadableByteStreamControllerRespondInClosedState(controller: ReadableByteStreamController,\n                                                          firstDescriptor: PullIntoDescriptor) {\n  assert(firstDescriptor.bytesFilled === 0);\n\n  const stream = controller._controlledReadableByteStream;\n  if (ReadableStreamHasBYOBReader(stream)) {\n    while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n      const pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);\n      ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);\n    }\n  }\n}\n\nfunction ReadableByteStreamControllerRespondInReadableState(controller: ReadableByteStreamController,\n                                                            bytesWritten: number,\n                                                            pullIntoDescriptor: PullIntoDescriptor) {\n  assert(pullIntoDescriptor.bytesFilled + bytesWritten <= pullIntoDescriptor.byteLength);\n\n  ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor);\n\n  if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {\n    return;\n  }\n\n  ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n  const remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize;\n  if (remainderSize > 0) {\n    const end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n    const remainder = ArrayBufferSlice(pullIntoDescriptor.buffer, end - remainderSize, end);\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength);\n  }\n\n  pullIntoDescriptor.bytesFilled -= remainderSize;\n  ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);\n\n  ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n}\n\nfunction ReadableByteStreamControllerRespondInternal(controller: ReadableByteStreamController, bytesWritten: number) {\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  assert(CanTransferArrayBuffer(firstDescriptor.buffer));\n\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n\n  const state = controller._controlledReadableByteStream._state;\n  if (state === 'closed') {\n    assert(bytesWritten === 0);\n    ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor);\n  } else {\n    assert(state === 'readable');\n    assert(bytesWritten > 0);\n    ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);\n  }\n\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nfunction ReadableByteStreamControllerShiftPendingPullInto(\n  controller: ReadableByteStreamController\n): PullIntoDescriptor {\n  assert(controller._byobRequest === null);\n  const descriptor = controller._pendingPullIntos.shift()!;\n  return descriptor;\n}\n\nfunction ReadableByteStreamControllerShouldCallPull(controller: ReadableByteStreamController): boolean {\n  const stream = controller._controlledReadableByteStream;\n\n  if (stream._state !== 'readable') {\n    return false;\n  }\n\n  if (controller._closeRequested) {\n    return false;\n  }\n\n  if (!controller._started) {\n    return false;\n  }\n\n  if (ReadableStreamHasDefaultReader(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    return true;\n  }\n\n  if (ReadableStreamHasBYOBReader(stream) && ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n    return true;\n  }\n\n  const desiredSize = ReadableByteStreamControllerGetDesiredSize(controller);\n  assert(desiredSize !== null);\n  if (desiredSize! > 0) {\n    return true;\n  }\n\n  return false;\n}\n\nfunction ReadableByteStreamControllerClearAlgorithms(controller: ReadableByteStreamController) {\n  controller._pullAlgorithm = undefined!;\n  controller._cancelAlgorithm = undefined!;\n}\n\n// A client of ReadableByteStreamController may use these functions directly to bypass state check.\n\nexport function ReadableByteStreamControllerClose(controller: ReadableByteStreamController) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (controller._closeRequested || stream._state !== 'readable') {\n    return;\n  }\n\n  if (controller._queueTotalSize > 0) {\n    controller._closeRequested = true;\n\n    return;\n  }\n\n  if (controller._pendingPullIntos.length > 0) {\n    const firstPendingPullInto = controller._pendingPullIntos.peek();\n    if (firstPendingPullInto.bytesFilled > 0) {\n      const e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n      ReadableByteStreamControllerError(controller, e);\n\n      throw e;\n    }\n  }\n\n  ReadableByteStreamControllerClearAlgorithms(controller);\n  ReadableStreamClose(stream);\n}\n\nexport function ReadableByteStreamControllerEnqueue(controller: ReadableByteStreamController, chunk: ArrayBufferView) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (controller._closeRequested || stream._state !== 'readable') {\n    return;\n  }\n\n  const buffer = chunk.buffer;\n  const byteOffset = chunk.byteOffset;\n  const byteLength = chunk.byteLength;\n  if (IsDetachedBuffer(buffer)) {\n    throw new TypeError('chunk\\'s buffer is detached and so cannot be enqueued');\n  }\n  const transferredBuffer = TransferArrayBuffer(buffer);\n\n  if (controller._pendingPullIntos.length > 0) {\n    const firstPendingPullInto = controller._pendingPullIntos.peek();\n    if (IsDetachedBuffer(firstPendingPullInto.buffer)) {\n      throw new TypeError(\n        'The BYOB request\\'s buffer has been detached and so cannot be filled with an enqueued chunk'\n      );\n    }\n    firstPendingPullInto.buffer = TransferArrayBuffer(firstPendingPullInto.buffer);\n  }\n\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n\n  if (ReadableStreamHasDefaultReader(stream)) {\n    if (ReadableStreamGetNumReadRequests(stream) === 0) {\n      assert(controller._pendingPullIntos.length === 0);\n      ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n    } else {\n      assert(controller._queue.length === 0);\n      if (controller._pendingPullIntos.length > 0) {\n        assert(controller._pendingPullIntos.peek().readerType === 'default');\n        ReadableByteStreamControllerShiftPendingPullInto(controller);\n      }\n      const transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength);\n      ReadableStreamFulfillReadRequest(stream, transferredView, false);\n    }\n  } else if (ReadableStreamHasBYOBReader(stream)) {\n    // TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully.\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n    ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n  } else {\n    assert(!IsReadableStreamLocked(stream));\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n  }\n\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nexport function ReadableByteStreamControllerError(controller: ReadableByteStreamController, e: any) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (stream._state !== 'readable') {\n    return;\n  }\n\n  ReadableByteStreamControllerClearPendingPullIntos(controller);\n\n  ResetQueue(controller);\n  ReadableByteStreamControllerClearAlgorithms(controller);\n  ReadableStreamError(stream, e);\n}\n\nexport function ReadableByteStreamControllerGetBYOBRequest(\n  controller: ReadableByteStreamController\n): ReadableStreamBYOBRequest | null {\n  if (controller._byobRequest === null && controller._pendingPullIntos.length > 0) {\n    const firstDescriptor = controller._pendingPullIntos.peek();\n    const view = new Uint8Array(firstDescriptor.buffer,\n                                firstDescriptor.byteOffset + firstDescriptor.bytesFilled,\n                                firstDescriptor.byteLength - firstDescriptor.bytesFilled);\n\n    const byobRequest: ReadableStreamBYOBRequest = Object.create(ReadableStreamBYOBRequest.prototype);\n    SetUpReadableStreamBYOBRequest(byobRequest, controller, view);\n    controller._byobRequest = byobRequest;\n  }\n  return controller._byobRequest;\n}\n\nfunction ReadableByteStreamControllerGetDesiredSize(controller: ReadableByteStreamController): number | null {\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'errored') {\n    return null;\n  }\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\nexport function ReadableByteStreamControllerRespond(controller: ReadableByteStreamController, bytesWritten: number) {\n  assert(controller._pendingPullIntos.length > 0);\n\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'closed') {\n    if (bytesWritten !== 0) {\n      throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream');\n    }\n  } else {\n    assert(state === 'readable');\n    if (bytesWritten === 0) {\n      throw new TypeError('bytesWritten must be greater than 0 when calling respond() on a readable stream');\n    }\n    if (firstDescriptor.bytesFilled + bytesWritten > firstDescriptor.byteLength) {\n      throw new RangeError('bytesWritten out of range');\n    }\n  }\n\n  firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer);\n\n  ReadableByteStreamControllerRespondInternal(controller, bytesWritten);\n}\n\nexport function ReadableByteStreamControllerRespondWithNewView(controller: ReadableByteStreamController,\n                                                               view: ArrayBufferView) {\n  assert(controller._pendingPullIntos.length > 0);\n  assert(!IsDetachedBuffer(view.buffer));\n\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'closed') {\n    if (view.byteLength !== 0) {\n      throw new TypeError('The view\\'s length must be 0 when calling respondWithNewView() on a closed stream');\n    }\n  } else {\n    assert(state === 'readable');\n    if (view.byteLength === 0) {\n      throw new TypeError(\n        'The view\\'s length must be greater than 0 when calling respondWithNewView() on a readable stream'\n      );\n    }\n  }\n\n  if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) {\n    throw new RangeError('The region specified by view does not match byobRequest');\n  }\n  if (firstDescriptor.bufferByteLength !== view.buffer.byteLength) {\n    throw new RangeError('The buffer of view has different capacity than byobRequest');\n  }\n  if (firstDescriptor.bytesFilled + view.byteLength > firstDescriptor.byteLength) {\n    throw new RangeError('The region specified by view is larger than byobRequest');\n  }\n\n  const viewByteLength = view.byteLength;\n  firstDescriptor.buffer = TransferArrayBuffer(view.buffer);\n  ReadableByteStreamControllerRespondInternal(controller, viewByteLength);\n}\n\nexport function SetUpReadableByteStreamController(stream: ReadableByteStream,\n                                                  controller: ReadableByteStreamController,\n                                                  startAlgorithm: () => void | PromiseLike<void>,\n                                                  pullAlgorithm: () => Promise<void>,\n                                                  cancelAlgorithm: (reason: any) => Promise<void>,\n                                                  highWaterMark: number,\n                                                  autoAllocateChunkSize: number | undefined) {\n  assert(stream._readableStreamController === undefined);\n  if (autoAllocateChunkSize !== undefined) {\n    assert(NumberIsInteger(autoAllocateChunkSize));\n    assert(autoAllocateChunkSize > 0);\n  }\n\n  controller._controlledReadableByteStream = stream;\n\n  controller._pullAgain = false;\n  controller._pulling = false;\n\n  controller._byobRequest = null;\n\n  // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n  controller._queue = controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._closeRequested = false;\n  controller._started = false;\n\n  controller._strategyHWM = highWaterMark;\n\n  controller._pullAlgorithm = pullAlgorithm;\n  controller._cancelAlgorithm = cancelAlgorithm;\n\n  controller._autoAllocateChunkSize = autoAllocateChunkSize;\n\n  controller._pendingPullIntos = new SimpleQueue();\n\n  stream._readableStreamController = controller;\n\n  const startResult = startAlgorithm();\n  uponPromise(\n    promiseResolvedWith(startResult),\n    () => {\n      controller._started = true;\n\n      assert(!controller._pulling);\n      assert(!controller._pullAgain);\n\n      ReadableByteStreamControllerCallPullIfNeeded(controller);\n    },\n    r => {\n      ReadableByteStreamControllerError(controller, r);\n    }\n  );\n}\n\nexport function SetUpReadableByteStreamControllerFromUnderlyingSource(\n  stream: ReadableByteStream,\n  underlyingByteSource: ValidatedUnderlyingByteSource,\n  highWaterMark: number\n) {\n  const controller: ReadableByteStreamController = Object.create(ReadableByteStreamController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let pullAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let cancelAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingByteSource.start !== undefined) {\n    startAlgorithm = () => underlyingByteSource.start!(controller);\n  }\n  if (underlyingByteSource.pull !== undefined) {\n    pullAlgorithm = () => underlyingByteSource.pull!(controller);\n  }\n  if (underlyingByteSource.cancel !== undefined) {\n    cancelAlgorithm = reason => underlyingByteSource.cancel!(reason);\n  }\n\n  const autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;\n  if (autoAllocateChunkSize === 0) {\n    throw new TypeError('autoAllocateChunkSize must be greater than 0');\n  }\n\n  SetUpReadableByteStreamController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize\n  );\n}\n\nfunction SetUpReadableStreamBYOBRequest(request: ReadableStreamBYOBRequest,\n                                        controller: ReadableByteStreamController,\n                                        view: ArrayBufferView) {\n  assert(IsReadableByteStreamController(controller));\n  assert(typeof view === 'object');\n  assert(ArrayBuffer.isView(view));\n  assert(!IsDetachedBuffer(view.buffer));\n  request._associatedReadableByteStreamController = controller;\n  request._view = view;\n}\n\n// Helper functions for the ReadableStreamBYOBRequest.\n\nfunction byobRequestBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamBYOBRequest.prototype.${name} can only be used on a ReadableStreamBYOBRequest`);\n}\n\n// Helper functions for the ReadableByteStreamController.\n\nfunction byteStreamControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableByteStreamController.prototype.${name} can only be used on a ReadableByteStreamController`);\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericInitialize,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport { IsReadableStreamLocked, ReadableByteStream, ReadableStream } from '../readable-stream';\nimport {\n  IsReadableByteStreamController,\n  ReadableByteStreamController,\n  ReadableByteStreamControllerPullInto\n} from './byte-stream-controller';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { newPromise, promiseRejectedWith } from '../helpers/webidl';\nimport { assertRequiredArgument } from '../validators/basic';\nimport { assertReadableStream } from '../validators/readable-stream';\nimport { IsDetachedBuffer } from '../abstract-ops/ecmascript';\n\n/**\n * A result returned by {@link ReadableStreamBYOBReader.read}.\n *\n * @public\n */\nexport type ReadableStreamBYOBReadResult<T extends ArrayBufferView> = {\n  done: false;\n  value: T;\n} | {\n  done: true;\n  value: T | undefined;\n};\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamBYOBReader(stream: ReadableByteStream): ReadableStreamBYOBReader {\n  return new ReadableStreamBYOBReader(stream);\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamAddReadIntoRequest<T extends ArrayBufferView>(stream: ReadableByteStream,\n                                                                            readIntoRequest: ReadIntoRequest<T>): void {\n  assert(IsReadableStreamBYOBReader(stream._reader));\n  assert(stream._state === 'readable' || stream._state === 'closed');\n\n  (stream._reader! as ReadableStreamBYOBReader)._readIntoRequests.push(readIntoRequest);\n}\n\nexport function ReadableStreamFulfillReadIntoRequest(stream: ReadableByteStream,\n                                                     chunk: ArrayBufferView,\n                                                     done: boolean) {\n  const reader = stream._reader as ReadableStreamBYOBReader;\n\n  assert(reader._readIntoRequests.length > 0);\n\n  const readIntoRequest = reader._readIntoRequests.shift()!;\n  if (done) {\n    readIntoRequest._closeSteps(chunk);\n  } else {\n    readIntoRequest._chunkSteps(chunk);\n  }\n}\n\nexport function ReadableStreamGetNumReadIntoRequests(stream: ReadableByteStream): number {\n  return (stream._reader as ReadableStreamBYOBReader)._readIntoRequests.length;\n}\n\nexport function ReadableStreamHasBYOBReader(stream: ReadableByteStream): boolean {\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return false;\n  }\n\n  if (!IsReadableStreamBYOBReader(reader)) {\n    return false;\n  }\n\n  return true;\n}\n\n// Readers\n\nexport interface ReadIntoRequest<T extends ArrayBufferView> {\n  _chunkSteps(chunk: T): void;\n\n  _closeSteps(chunk: T | undefined): void;\n\n  _errorSteps(e: any): void;\n}\n\n/**\n * A BYOB reader vended by a {@link ReadableStream}.\n *\n * @public\n */\nexport class ReadableStreamBYOBReader {\n  /** @internal */\n  _ownerReadableStream!: ReadableByteStream;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readIntoRequests: SimpleQueue<ReadIntoRequest<any>>;\n\n  constructor(stream: ReadableByteStream) {\n    assertRequiredArgument(stream, 1, 'ReadableStreamBYOBReader');\n    assertReadableStream(stream, 'First parameter');\n\n    if (IsReadableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n    }\n\n    if (!IsReadableByteStreamController(stream._readableStreamController)) {\n      throw new TypeError('Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte ' +\n        'source');\n    }\n\n    ReadableStreamReaderGenericInitialize(this, stream);\n\n    this._readIntoRequests = new SimpleQueue();\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or\n   * the reader's lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('cancel'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('cancel'));\n    }\n\n    return ReadableStreamReaderGenericCancel(this, reason);\n  }\n\n  /**\n   * Attempts to reads bytes into view, and returns a promise resolved with the result.\n   *\n   * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.\n   */\n  read<T extends ArrayBufferView>(view: T): Promise<ReadableStreamBYOBReadResult<T>> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('read'));\n    }\n\n    if (!ArrayBuffer.isView(view)) {\n      return promiseRejectedWith(new TypeError('view must be an array buffer view'));\n    }\n    if (view.byteLength === 0) {\n      return promiseRejectedWith(new TypeError('view must have non-zero byteLength'));\n    }\n    if (view.buffer.byteLength === 0) {\n      return promiseRejectedWith(new TypeError(`view's buffer must have non-zero byteLength`));\n    }\n    if (IsDetachedBuffer(view.buffer)) {\n      return promiseRejectedWith(new TypeError('view\\'s buffer has been detached'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('read from'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamBYOBReadResult<T>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamBYOBReadResult<T>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readIntoRequest: ReadIntoRequest<T> = {\n      _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),\n      _closeSteps: chunk => resolvePromise({ value: chunk, done: true }),\n      _errorSteps: e => rejectPromise(e)\n    };\n    ReadableStreamBYOBReaderRead(this, view, readIntoRequest);\n    return promise;\n  }\n\n  /**\n   * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.\n   * If the associated stream is errored when the lock is released, the reader will appear errored in the same way\n   * from now on; otherwise, the reader will appear closed.\n   *\n   * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by\n   * the reader's {@link ReadableStreamBYOBReader.read | read()} method has not yet been settled. Attempting to\n   * do so will throw a `TypeError` and leave the reader locked to the stream.\n   */\n  releaseLock(): void {\n    if (!IsReadableStreamBYOBReader(this)) {\n      throw byobReaderBrandCheckException('releaseLock');\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return;\n    }\n\n    if (this._readIntoRequests.length > 0) {\n      throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n    }\n\n    ReadableStreamReaderGenericRelease(this);\n  }\n}\n\nObject.defineProperties(ReadableStreamBYOBReader.prototype, {\n  cancel: { enumerable: true },\n  read: { enumerable: true },\n  releaseLock: { enumerable: true },\n  closed: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamBYOBReader.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamBYOBReader',\n    configurable: true\n  });\n}\n\n// Abstract operations for the readers.\n\nexport function IsReadableStreamBYOBReader(x: any): x is ReadableStreamBYOBReader {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readIntoRequests')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamBYOBReader;\n}\n\nexport function ReadableStreamBYOBReaderRead<T extends ArrayBufferView>(\n  reader: ReadableStreamBYOBReader,\n  view: T,\n  readIntoRequest: ReadIntoRequest<T>\n): void {\n  const stream = reader._ownerReadableStream;\n\n  assert(stream !== undefined);\n\n  stream._disturbed = true;\n\n  if (stream._state === 'errored') {\n    readIntoRequest._errorSteps(stream._storedError);\n  } else {\n    ReadableByteStreamControllerPullInto(\n      stream._readableStreamController as ReadableByteStreamController,\n      view,\n      readIntoRequest\n    );\n  }\n}\n\n// Helper functions for the ReadableStreamBYOBReader.\n\nfunction byobReaderBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamBYOBReader.prototype.${name} can only be used on a ReadableStreamBYOBReader`);\n}\n","import { QueuingStrategy, QueuingStrategySizeCallback } from '../queuing-strategy';\nimport NumberIsNaN from '../../stub/number-isnan';\n\nexport function ExtractHighWaterMark(strategy: QueuingStrategy, defaultHWM: number): number {\n  const { highWaterMark } = strategy;\n\n  if (highWaterMark === undefined) {\n    return defaultHWM;\n  }\n\n  if (NumberIsNaN(highWaterMark) || highWaterMark < 0) {\n    throw new RangeError('Invalid highWaterMark');\n  }\n\n  return highWaterMark;\n}\n\nexport function ExtractSizeAlgorithm<T>(strategy: QueuingStrategy<T>): QueuingStrategySizeCallback<T> {\n  const { size } = strategy;\n\n  if (!size) {\n    return () => 1;\n  }\n\n  return size;\n}\n","import { QueuingStrategy, QueuingStrategySizeCallback } from '../queuing-strategy';\nimport { assertDictionary, assertFunction, convertUnrestrictedDouble } from './basic';\n\nexport function convertQueuingStrategy<T>(init: QueuingStrategy<T> | null | undefined,\n                                          context: string): QueuingStrategy<T> {\n  assertDictionary(init, context);\n  const highWaterMark = init?.highWaterMark;\n  const size = init?.size;\n  return {\n    highWaterMark: highWaterMark === undefined ? undefined : convertUnrestrictedDouble(highWaterMark),\n    size: size === undefined ? undefined : convertQueuingStrategySize(size, `${context} has member 'size' that`)\n  };\n}\n\nfunction convertQueuingStrategySize<T>(fn: QueuingStrategySizeCallback<T>,\n                                       context: string): QueuingStrategySizeCallback<T> {\n  assertFunction(fn, context);\n  return chunk => convertUnrestrictedDouble(fn(chunk));\n}\n","import { assertDictionary, assertFunction } from './basic';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\nimport {\n  UnderlyingSink,\n  UnderlyingSinkAbortCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  ValidatedUnderlyingSink\n} from '../writable-stream/underlying-sink';\nimport { WritableStreamDefaultController } from '../writable-stream';\n\nexport function convertUnderlyingSink<W>(original: UnderlyingSink<W> | null,\n                                         context: string): ValidatedUnderlyingSink<W> {\n  assertDictionary(original, context);\n  const abort = original?.abort;\n  const close = original?.close;\n  const start = original?.start;\n  const type = original?.type;\n  const write = original?.write;\n  return {\n    abort: abort === undefined ?\n      undefined :\n      convertUnderlyingSinkAbortCallback(abort, original!, `${context} has member 'abort' that`),\n    close: close === undefined ?\n      undefined :\n      convertUnderlyingSinkCloseCallback(close, original!, `${context} has member 'close' that`),\n    start: start === undefined ?\n      undefined :\n      convertUnderlyingSinkStartCallback(start, original!, `${context} has member 'start' that`),\n    write: write === undefined ?\n      undefined :\n      convertUnderlyingSinkWriteCallback(write, original!, `${context} has member 'write' that`),\n    type\n  };\n}\n\nfunction convertUnderlyingSinkAbortCallback(\n  fn: UnderlyingSinkAbortCallback,\n  original: UnderlyingSink,\n  context: string\n): (reason: any) => Promise<void> {\n  assertFunction(fn, context);\n  return (reason: any) => promiseCall(fn, original, [reason]);\n}\n\nfunction convertUnderlyingSinkCloseCallback(\n  fn: UnderlyingSinkCloseCallback,\n  original: UnderlyingSink,\n  context: string\n): () => Promise<void> {\n  assertFunction(fn, context);\n  return () => promiseCall(fn, original, []);\n}\n\nfunction convertUnderlyingSinkStartCallback(\n  fn: UnderlyingSinkStartCallback,\n  original: UnderlyingSink,\n  context: string\n): UnderlyingSinkStartCallback {\n  assertFunction(fn, context);\n  return (controller: WritableStreamDefaultController) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertUnderlyingSinkWriteCallback<W>(\n  fn: UnderlyingSinkWriteCallback<W>,\n  original: UnderlyingSink<W>,\n  context: string\n): (chunk: W, controller: WritableStreamDefaultController) => Promise<void> {\n  assertFunction(fn, context);\n  return (chunk: W, controller: WritableStreamDefaultController) => promiseCall(fn, original, [chunk, controller]);\n}\n","import { IsWritableStream, WritableStream } from '../writable-stream';\n\nexport function assertWritableStream(x: unknown, context: string): asserts x is WritableStream {\n  if (!IsWritableStream(x)) {\n    throw new TypeError(`${context} is not a WritableStream.`);\n  }\n}\n","/**\n * A signal object that allows you to communicate with a request and abort it if required\n * via its associated `AbortController` object.\n *\n * @remarks\n *   This interface is compatible with the `AbortSignal` interface defined in TypeScript's DOM types.\n *   It is redefined here, so it can be polyfilled without a DOM, for example with\n *   {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.\n *\n * @public\n */\nexport interface AbortSignal {\n  /**\n   * Whether the request is aborted.\n   */\n  readonly aborted: boolean;\n\n  /**\n   * Add an event listener to be triggered when this signal becomes aborted.\n   */\n  addEventListener(type: 'abort', listener: () => void): void;\n\n  /**\n   * Remove an event listener that was previously added with {@link AbortSignal.addEventListener}.\n   */\n  removeEventListener(type: 'abort', listener: () => void): void;\n}\n\nexport function isAbortSignal(value: unknown): value is AbortSignal {\n  if (typeof value !== 'object' || value === null) {\n    return false;\n  }\n  try {\n    return typeof (value as AbortSignal).aborted === 'boolean';\n  } catch {\n    // AbortSignal.prototype.aborted throws if its brand check fails\n    return false;\n  }\n}\n\n/**\n * A controller object that allows you to abort an `AbortSignal` when desired.\n *\n * @remarks\n *   This interface is compatible with the `AbortController` interface defined in TypeScript's DOM types.\n *   It is redefined here, so it can be polyfilled without a DOM, for example with\n *   {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.\n *\n * @internal\n */\nexport interface AbortController {\n  readonly signal: AbortSignal;\n\n  abort(): void;\n}\n\ninterface AbortControllerConstructor {\n  new(): AbortController;\n}\n\nconst supportsAbortController = typeof (AbortController as any) === 'function';\n\n/**\n * Construct a new AbortController, if supported by the platform.\n *\n * @internal\n */\nexport function createAbortController(): AbortController | undefined {\n  if (supportsAbortController) {\n    return new (AbortController as AbortControllerConstructor)();\n  }\n  return undefined;\n}\n","import assert from '../stub/assert';\nimport {\n  newPromise,\n  promiseRejectedWith,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  uponPromise\n} from './helpers/webidl';\nimport {\n  DequeueValue,\n  EnqueueValueWithSize,\n  PeekQueueValue,\n  QueuePair,\n  ResetQueue\n} from './abstract-ops/queue-with-sizes';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { SimpleQueue } from './simple-queue';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { AbortSteps, ErrorSteps } from './abstract-ops/internal-methods';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport {\n  UnderlyingSink,\n  UnderlyingSinkAbortCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  ValidatedUnderlyingSink\n} from './writable-stream/underlying-sink';\nimport { assertObject, assertRequiredArgument } from './validators/basic';\nimport { convertUnderlyingSink } from './validators/underlying-sink';\nimport { assertWritableStream } from './validators/writable-stream';\nimport { AbortController, AbortSignal, createAbortController } from './abort-signal';\n\ntype WritableStreamState = 'writable' | 'closed' | 'erroring' | 'errored';\n\ninterface WriteOrCloseRequest {\n  _resolve: (value?: undefined) => void;\n  _reject: (reason: any) => void;\n}\n\ntype WriteRequest = WriteOrCloseRequest;\ntype CloseRequest = WriteOrCloseRequest;\n\ninterface PendingAbortRequest {\n  _promise: Promise<undefined>;\n  _resolve: (value?: undefined) => void;\n  _reject: (reason: any) => void;\n  _reason: any;\n  _wasAlreadyErroring: boolean;\n}\n\n/**\n * A writable stream represents a destination for data, into which you can write.\n *\n * @public\n */\nclass WritableStream<W = any> {\n  /** @internal */\n  _state!: WritableStreamState;\n  /** @internal */\n  _storedError: any;\n  /** @internal */\n  _writer: WritableStreamDefaultWriter<W> | undefined;\n  /** @internal */\n  _writableStreamController!: WritableStreamDefaultController<W>;\n  /** @internal */\n  _writeRequests!: SimpleQueue<WriteRequest>;\n  /** @internal */\n  _inFlightWriteRequest: WriteRequest | undefined;\n  /** @internal */\n  _closeRequest: CloseRequest | undefined;\n  /** @internal */\n  _inFlightCloseRequest: CloseRequest | undefined;\n  /** @internal */\n  _pendingAbortRequest: PendingAbortRequest | undefined;\n  /** @internal */\n  _backpressure!: boolean;\n\n  constructor(underlyingSink?: UnderlyingSink<W>, strategy?: QueuingStrategy<W>);\n  constructor(rawUnderlyingSink: UnderlyingSink<W> | null | undefined = {},\n              rawStrategy: QueuingStrategy<W> | null | undefined = {}) {\n    if (rawUnderlyingSink === undefined) {\n      rawUnderlyingSink = null;\n    } else {\n      assertObject(rawUnderlyingSink, 'First parameter');\n    }\n\n    const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');\n    const underlyingSink = convertUnderlyingSink(rawUnderlyingSink, 'First parameter');\n\n    InitializeWritableStream(this);\n\n    const type = underlyingSink.type;\n    if (type !== undefined) {\n      throw new RangeError('Invalid type is specified');\n    }\n\n    const sizeAlgorithm = ExtractSizeAlgorithm(strategy);\n    const highWaterMark = ExtractHighWaterMark(strategy, 1);\n\n    SetUpWritableStreamDefaultControllerFromUnderlyingSink(this, underlyingSink, highWaterMark, sizeAlgorithm);\n  }\n\n  /**\n   * Returns whether or not the writable stream is locked to a writer.\n   */\n  get locked(): boolean {\n    if (!IsWritableStream(this)) {\n      throw streamBrandCheckException('locked');\n    }\n\n    return IsWritableStreamLocked(this);\n  }\n\n  /**\n   * Aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be\n   * immediately moved to an errored state, with any queued-up writes discarded. This will also execute any abort\n   * mechanism of the underlying sink.\n   *\n   * The returned promise will fulfill if the stream shuts down successfully, or reject if the underlying sink signaled\n   * that there was an error doing so. Additionally, it will reject with a `TypeError` (without attempting to cancel\n   * the stream) if the stream is currently locked.\n   */\n  abort(reason: any = undefined): Promise<void> {\n    if (!IsWritableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('abort'));\n    }\n\n    if (IsWritableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot abort a stream that already has a writer'));\n    }\n\n    return WritableStreamAbort(this, reason);\n  }\n\n  /**\n   * Closes the stream. The underlying sink will finish processing any previously-written chunks, before invoking its\n   * close behavior. During this time any further attempts to write will fail (without erroring the stream).\n   *\n   * The method returns a promise that will fulfill if all remaining chunks are successfully written and the stream\n   * successfully closes, or rejects if an error is encountered during this process. Additionally, it will reject with\n   * a `TypeError` (without attempting to cancel the stream) if the stream is currently locked.\n   */\n  close() {\n    if (!IsWritableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('close'));\n    }\n\n    if (IsWritableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot close a stream that already has a writer'));\n    }\n\n    if (WritableStreamCloseQueuedOrInFlight(this)) {\n      return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));\n    }\n\n    return WritableStreamClose(this);\n  }\n\n  /**\n   * Creates a {@link WritableStreamDefaultWriter | writer} and locks the stream to the new writer. While the stream\n   * is locked, no other writer can be acquired until this one is released.\n   *\n   * This functionality is especially useful for creating abstractions that desire the ability to write to a stream\n   * without interruption or interleaving. By getting a writer for the stream, you can ensure nobody else can write at\n   * the same time, which would cause the resulting written data to be unpredictable and probably useless.\n   */\n  getWriter(): WritableStreamDefaultWriter<W> {\n    if (!IsWritableStream(this)) {\n      throw streamBrandCheckException('getWriter');\n    }\n\n    return AcquireWritableStreamDefaultWriter(this);\n  }\n}\n\nObject.defineProperties(WritableStream.prototype, {\n  abort: { enumerable: true },\n  close: { enumerable: true },\n  getWriter: { enumerable: true },\n  locked: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStream.prototype, Symbol.toStringTag, {\n    value: 'WritableStream',\n    configurable: true\n  });\n}\n\nexport {\n  AcquireWritableStreamDefaultWriter,\n  CreateWritableStream,\n  IsWritableStream,\n  IsWritableStreamLocked,\n  WritableStream,\n  WritableStreamAbort,\n  WritableStreamDefaultControllerErrorIfNeeded,\n  WritableStreamDefaultWriterCloseWithErrorPropagation,\n  WritableStreamDefaultWriterRelease,\n  WritableStreamDefaultWriterWrite,\n  WritableStreamCloseQueuedOrInFlight,\n  UnderlyingSink,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkAbortCallback\n};\n\n// Abstract operations for the WritableStream.\n\nfunction AcquireWritableStreamDefaultWriter<W>(stream: WritableStream<W>): WritableStreamDefaultWriter<W> {\n  return new WritableStreamDefaultWriter(stream);\n}\n\n// Throws if and only if startAlgorithm throws.\nfunction CreateWritableStream<W>(startAlgorithm: () => void | PromiseLike<void>,\n                                 writeAlgorithm: (chunk: W) => Promise<void>,\n                                 closeAlgorithm: () => Promise<void>,\n                                 abortAlgorithm: (reason: any) => Promise<void>,\n                                 highWaterMark = 1,\n                                 sizeAlgorithm: QueuingStrategySizeCallback<W> = () => 1) {\n  assert(IsNonNegativeNumber(highWaterMark));\n\n  const stream: WritableStream<W> = Object.create(WritableStream.prototype);\n  InitializeWritableStream(stream);\n\n  const controller: WritableStreamDefaultController<W> = Object.create(WritableStreamDefaultController.prototype);\n\n  SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm,\n                                       abortAlgorithm, highWaterMark, sizeAlgorithm);\n  return stream;\n}\n\nfunction InitializeWritableStream<W>(stream: WritableStream<W>) {\n  stream._state = 'writable';\n\n  // The error that will be reported by new method calls once the state becomes errored. Only set when [[state]] is\n  // 'erroring' or 'errored'. May be set to an undefined value.\n  stream._storedError = undefined;\n\n  stream._writer = undefined;\n\n  // Initialize to undefined first because the constructor of the controller checks this\n  // variable to validate the caller.\n  stream._writableStreamController = undefined!;\n\n  // This queue is placed here instead of the writer class in order to allow for passing a writer to the next data\n  // producer without waiting for the queued writes to finish.\n  stream._writeRequests = new SimpleQueue();\n\n  // Write requests are removed from _writeRequests when write() is called on the underlying sink. This prevents\n  // them from being erroneously rejected on error. If a write() call is in-flight, the request is stored here.\n  stream._inFlightWriteRequest = undefined;\n\n  // The promise that was returned from writer.close(). Stored here because it may be fulfilled after the writer\n  // has been detached.\n  stream._closeRequest = undefined;\n\n  // Close request is removed from _closeRequest when close() is called on the underlying sink. This prevents it\n  // from being erroneously rejected on error. If a close() call is in-flight, the request is stored here.\n  stream._inFlightCloseRequest = undefined;\n\n  // The promise that was returned from writer.abort(). This may also be fulfilled after the writer has detached.\n  stream._pendingAbortRequest = undefined;\n\n  // The backpressure signal set by the controller.\n  stream._backpressure = false;\n}\n\nfunction IsWritableStream(x: unknown): x is WritableStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_writableStreamController')) {\n    return false;\n  }\n\n  return x instanceof WritableStream;\n}\n\nfunction IsWritableStreamLocked(stream: WritableStream): boolean {\n  assert(IsWritableStream(stream));\n\n  if (stream._writer === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamAbort(stream: WritableStream, reason: any): Promise<undefined> {\n  if (stream._state === 'closed' || stream._state === 'errored') {\n    return promiseResolvedWith(undefined);\n  }\n  stream._writableStreamController._abortReason = reason;\n  stream._writableStreamController._abortController?.abort();\n\n  // TypeScript narrows the type of `stream._state` down to 'writable' | 'erroring',\n  // but it doesn't know that signaling abort runs author code that might have changed the state.\n  // Widen the type again by casting to WritableStreamState.\n  const state = stream._state as WritableStreamState;\n\n  if (state === 'closed' || state === 'errored') {\n    return promiseResolvedWith(undefined);\n  }\n  if (stream._pendingAbortRequest !== undefined) {\n    return stream._pendingAbortRequest._promise;\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n\n  let wasAlreadyErroring = false;\n  if (state === 'erroring') {\n    wasAlreadyErroring = true;\n    // reason will not be used, so don't keep a reference to it.\n    reason = undefined;\n  }\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    stream._pendingAbortRequest = {\n      _promise: undefined!,\n      _resolve: resolve,\n      _reject: reject,\n      _reason: reason,\n      _wasAlreadyErroring: wasAlreadyErroring\n    };\n  });\n  stream._pendingAbortRequest!._promise = promise;\n\n  if (!wasAlreadyErroring) {\n    WritableStreamStartErroring(stream, reason);\n  }\n\n  return promise;\n}\n\nfunction WritableStreamClose(stream: WritableStream<any>): Promise<undefined> {\n  const state = stream._state;\n  if (state === 'closed' || state === 'errored') {\n    return promiseRejectedWith(new TypeError(\n      `The stream (in ${state} state) is not in the writable state and cannot be closed`));\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n  assert(!WritableStreamCloseQueuedOrInFlight(stream));\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    const closeRequest: CloseRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._closeRequest = closeRequest;\n  });\n\n  const writer = stream._writer;\n  if (writer !== undefined && stream._backpressure && state === 'writable') {\n    defaultWriterReadyPromiseResolve(writer);\n  }\n\n  WritableStreamDefaultControllerClose(stream._writableStreamController);\n\n  return promise;\n}\n\n// WritableStream API exposed for controllers.\n\nfunction WritableStreamAddWriteRequest(stream: WritableStream): Promise<undefined> {\n  assert(IsWritableStreamLocked(stream));\n  assert(stream._state === 'writable');\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    const writeRequest: WriteRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._writeRequests.push(writeRequest);\n  });\n\n  return promise;\n}\n\nfunction WritableStreamDealWithRejection(stream: WritableStream, error: any) {\n  const state = stream._state;\n\n  if (state === 'writable') {\n    WritableStreamStartErroring(stream, error);\n    return;\n  }\n\n  assert(state === 'erroring');\n  WritableStreamFinishErroring(stream);\n}\n\nfunction WritableStreamStartErroring(stream: WritableStream, reason: any) {\n  assert(stream._storedError === undefined);\n  assert(stream._state === 'writable');\n\n  const controller = stream._writableStreamController;\n  assert(controller !== undefined);\n\n  stream._state = 'erroring';\n  stream._storedError = reason;\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);\n  }\n\n  if (!WritableStreamHasOperationMarkedInFlight(stream) && controller._started) {\n    WritableStreamFinishErroring(stream);\n  }\n}\n\nfunction WritableStreamFinishErroring(stream: WritableStream) {\n  assert(stream._state === 'erroring');\n  assert(!WritableStreamHasOperationMarkedInFlight(stream));\n  stream._state = 'errored';\n  stream._writableStreamController[ErrorSteps]();\n\n  const storedError = stream._storedError;\n  stream._writeRequests.forEach(writeRequest => {\n    writeRequest._reject(storedError);\n  });\n  stream._writeRequests = new SimpleQueue();\n\n  if (stream._pendingAbortRequest === undefined) {\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    return;\n  }\n\n  const abortRequest = stream._pendingAbortRequest;\n  stream._pendingAbortRequest = undefined;\n\n  if (abortRequest._wasAlreadyErroring) {\n    abortRequest._reject(storedError);\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    return;\n  }\n\n  const promise = stream._writableStreamController[AbortSteps](abortRequest._reason);\n  uponPromise(\n    promise,\n    () => {\n      abortRequest._resolve();\n      WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    },\n    (reason: any) => {\n      abortRequest._reject(reason);\n      WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    });\n}\n\nfunction WritableStreamFinishInFlightWrite(stream: WritableStream) {\n  assert(stream._inFlightWriteRequest !== undefined);\n  stream._inFlightWriteRequest!._resolve(undefined);\n  stream._inFlightWriteRequest = undefined;\n}\n\nfunction WritableStreamFinishInFlightWriteWithError(stream: WritableStream, error: any) {\n  assert(stream._inFlightWriteRequest !== undefined);\n  stream._inFlightWriteRequest!._reject(error);\n  stream._inFlightWriteRequest = undefined;\n\n  assert(stream._state === 'writable' || stream._state === 'erroring');\n\n  WritableStreamDealWithRejection(stream, error);\n}\n\nfunction WritableStreamFinishInFlightClose(stream: WritableStream) {\n  assert(stream._inFlightCloseRequest !== undefined);\n  stream._inFlightCloseRequest!._resolve(undefined);\n  stream._inFlightCloseRequest = undefined;\n\n  const state = stream._state;\n\n  assert(state === 'writable' || state === 'erroring');\n\n  if (state === 'erroring') {\n    // The error was too late to do anything, so it is ignored.\n    stream._storedError = undefined;\n    if (stream._pendingAbortRequest !== undefined) {\n      stream._pendingAbortRequest._resolve();\n      stream._pendingAbortRequest = undefined;\n    }\n  }\n\n  stream._state = 'closed';\n\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    defaultWriterClosedPromiseResolve(writer);\n  }\n\n  assert(stream._pendingAbortRequest === undefined);\n  assert(stream._storedError === undefined);\n}\n\nfunction WritableStreamFinishInFlightCloseWithError(stream: WritableStream, error: any) {\n  assert(stream._inFlightCloseRequest !== undefined);\n  stream._inFlightCloseRequest!._reject(error);\n  stream._inFlightCloseRequest = undefined;\n\n  assert(stream._state === 'writable' || stream._state === 'erroring');\n\n  // Never execute sink abort() after sink close().\n  if (stream._pendingAbortRequest !== undefined) {\n    stream._pendingAbortRequest._reject(error);\n    stream._pendingAbortRequest = undefined;\n  }\n  WritableStreamDealWithRejection(stream, error);\n}\n\n// TODO(ricea): Fix alphabetical order.\nfunction WritableStreamCloseQueuedOrInFlight(stream: WritableStream): boolean {\n  if (stream._closeRequest === undefined && stream._inFlightCloseRequest === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamHasOperationMarkedInFlight(stream: WritableStream): boolean {\n  if (stream._inFlightWriteRequest === undefined && stream._inFlightCloseRequest === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamMarkCloseRequestInFlight(stream: WritableStream) {\n  assert(stream._inFlightCloseRequest === undefined);\n  assert(stream._closeRequest !== undefined);\n  stream._inFlightCloseRequest = stream._closeRequest;\n  stream._closeRequest = undefined;\n}\n\nfunction WritableStreamMarkFirstWriteRequestInFlight(stream: WritableStream) {\n  assert(stream._inFlightWriteRequest === undefined);\n  assert(stream._writeRequests.length !== 0);\n  stream._inFlightWriteRequest = stream._writeRequests.shift();\n}\n\nfunction WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream: WritableStream) {\n  assert(stream._state === 'errored');\n  if (stream._closeRequest !== undefined) {\n    assert(stream._inFlightCloseRequest === undefined);\n\n    stream._closeRequest._reject(stream._storedError);\n    stream._closeRequest = undefined;\n  }\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    defaultWriterClosedPromiseReject(writer, stream._storedError);\n  }\n}\n\nfunction WritableStreamUpdateBackpressure(stream: WritableStream, backpressure: boolean) {\n  assert(stream._state === 'writable');\n  assert(!WritableStreamCloseQueuedOrInFlight(stream));\n\n  const writer = stream._writer;\n  if (writer !== undefined && backpressure !== stream._backpressure) {\n    if (backpressure) {\n      defaultWriterReadyPromiseReset(writer);\n    } else {\n      assert(!backpressure);\n\n      defaultWriterReadyPromiseResolve(writer);\n    }\n  }\n\n  stream._backpressure = backpressure;\n}\n\n/**\n * A default writer vended by a {@link WritableStream}.\n *\n * @public\n */\nexport class WritableStreamDefaultWriter<W = any> {\n  /** @internal */\n  _ownerWritableStream: WritableStream<W>;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _closedPromiseState!: 'pending' | 'resolved' | 'rejected';\n  /** @internal */\n  _readyPromise!: Promise<undefined>;\n  /** @internal */\n  _readyPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _readyPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readyPromiseState!: 'pending' | 'fulfilled' | 'rejected';\n\n  constructor(stream: WritableStream<W>) {\n    assertRequiredArgument(stream, 1, 'WritableStreamDefaultWriter');\n    assertWritableStream(stream, 'First parameter');\n\n    if (IsWritableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive writing by another writer');\n    }\n\n    this._ownerWritableStream = stream;\n    stream._writer = this;\n\n    const state = stream._state;\n\n    if (state === 'writable') {\n      if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._backpressure) {\n        defaultWriterReadyPromiseInitialize(this);\n      } else {\n        defaultWriterReadyPromiseInitializeAsResolved(this);\n      }\n\n      defaultWriterClosedPromiseInitialize(this);\n    } else if (state === 'erroring') {\n      defaultWriterReadyPromiseInitializeAsRejected(this, stream._storedError);\n      defaultWriterClosedPromiseInitialize(this);\n    } else if (state === 'closed') {\n      defaultWriterReadyPromiseInitializeAsResolved(this);\n      defaultWriterClosedPromiseInitializeAsResolved(this);\n    } else {\n      assert(state === 'errored');\n\n      const storedError = stream._storedError;\n      defaultWriterReadyPromiseInitializeAsRejected(this, storedError);\n      defaultWriterClosedPromiseInitializeAsRejected(this, storedError);\n    }\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or\n   * the writer’s lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * Returns the desired size to fill the stream’s internal queue. It can be negative, if the queue is over-full.\n   * A producer can use this information to determine the right amount of data to write.\n   *\n   * It will be `null` if the stream cannot be successfully written to (due to either being errored, or having an abort\n   * queued up). It will return zero if the stream is closed. And the getter will throw an exception if invoked when\n   * the writer’s lock is released.\n   */\n  get desiredSize(): number | null {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      throw defaultWriterBrandCheckException('desiredSize');\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      throw defaultWriterLockException('desiredSize');\n    }\n\n    return WritableStreamDefaultWriterGetDesiredSize(this);\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the desired size to fill the stream’s internal queue transitions\n   * from non-positive to positive, signaling that it is no longer applying backpressure. Once the desired size dips\n   * back to zero or below, the getter will return a new promise that stays pending until the next transition.\n   *\n   * If the stream becomes errored or aborted, or the writer’s lock is released, the returned promise will become\n   * rejected.\n   */\n  get ready(): Promise<undefined> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('ready'));\n    }\n\n    return this._readyPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link WritableStream.abort | stream.abort(reason)}.\n   */\n  abort(reason: any = undefined): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('abort'));\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('abort'));\n    }\n\n    return WritableStreamDefaultWriterAbort(this, reason);\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link WritableStream.close | stream.close()}.\n   */\n  close(): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('close'));\n    }\n\n    const stream = this._ownerWritableStream;\n\n    if (stream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('close'));\n    }\n\n    if (WritableStreamCloseQueuedOrInFlight(stream)) {\n      return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));\n    }\n\n    return WritableStreamDefaultWriterClose(this);\n  }\n\n  /**\n   * Releases the writer’s lock on the corresponding stream. After the lock is released, the writer is no longer active.\n   * If the associated stream is errored when the lock is released, the writer will appear errored in the same way from\n   * now on; otherwise, the writer will appear closed.\n   *\n   * Note that the lock can still be released even if some ongoing writes have not yet finished (i.e. even if the\n   * promises returned from previous calls to {@link WritableStreamDefaultWriter.write | write()} have not yet settled).\n   * It’s not necessary to hold the lock on the writer for the duration of the write; the lock instead simply prevents\n   * other producers from writing in an interleaved manner.\n   */\n  releaseLock(): void {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      throw defaultWriterBrandCheckException('releaseLock');\n    }\n\n    const stream = this._ownerWritableStream;\n\n    if (stream === undefined) {\n      return;\n    }\n\n    assert(stream._writer !== undefined);\n\n    WritableStreamDefaultWriterRelease(this);\n  }\n\n  /**\n   * Writes the given chunk to the writable stream, by waiting until any previous writes have finished successfully,\n   * and then sending the chunk to the underlying sink's {@link UnderlyingSink.write | write()} method. It will return\n   * a promise that fulfills with undefined upon a successful write, or rejects if the write fails or stream becomes\n   * errored before the writing process is initiated.\n   *\n   * Note that what \"success\" means is up to the underlying sink; it might indicate simply that the chunk has been\n   * accepted, and not necessarily that it is safely saved to its ultimate destination.\n   */\n  write(chunk: W): Promise<void>;\n  write(chunk: W = undefined!): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('write'));\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('write to'));\n    }\n\n    return WritableStreamDefaultWriterWrite(this, chunk);\n  }\n}\n\nObject.defineProperties(WritableStreamDefaultWriter.prototype, {\n  abort: { enumerable: true },\n  close: { enumerable: true },\n  releaseLock: { enumerable: true },\n  write: { enumerable: true },\n  closed: { enumerable: true },\n  desiredSize: { enumerable: true },\n  ready: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStreamDefaultWriter.prototype, Symbol.toStringTag, {\n    value: 'WritableStreamDefaultWriter',\n    configurable: true\n  });\n}\n\n// Abstract operations for the WritableStreamDefaultWriter.\n\nfunction IsWritableStreamDefaultWriter<W = any>(x: any): x is WritableStreamDefaultWriter<W> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) {\n    return false;\n  }\n\n  return x instanceof WritableStreamDefaultWriter;\n}\n\n// A client of WritableStreamDefaultWriter may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultWriterAbort(writer: WritableStreamDefaultWriter, reason: any) {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  return WritableStreamAbort(stream, reason);\n}\n\nfunction WritableStreamDefaultWriterClose(writer: WritableStreamDefaultWriter): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  return WritableStreamClose(stream);\n}\n\nfunction WritableStreamDefaultWriterCloseWithErrorPropagation(writer: WritableStreamDefaultWriter): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  const state = stream._state;\n  if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {\n    return promiseResolvedWith(undefined);\n  }\n\n  if (state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n\n  return WritableStreamDefaultWriterClose(writer);\n}\n\nfunction WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer: WritableStreamDefaultWriter, error: any) {\n  if (writer._closedPromiseState === 'pending') {\n    defaultWriterClosedPromiseReject(writer, error);\n  } else {\n    defaultWriterClosedPromiseResetToRejected(writer, error);\n  }\n}\n\nfunction WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer: WritableStreamDefaultWriter, error: any) {\n  if (writer._readyPromiseState === 'pending') {\n    defaultWriterReadyPromiseReject(writer, error);\n  } else {\n    defaultWriterReadyPromiseResetToRejected(writer, error);\n  }\n}\n\nfunction WritableStreamDefaultWriterGetDesiredSize(writer: WritableStreamDefaultWriter): number | null {\n  const stream = writer._ownerWritableStream;\n  const state = stream._state;\n\n  if (state === 'errored' || state === 'erroring') {\n    return null;\n  }\n\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return WritableStreamDefaultControllerGetDesiredSize(stream._writableStreamController);\n}\n\nfunction WritableStreamDefaultWriterRelease(writer: WritableStreamDefaultWriter) {\n  const stream = writer._ownerWritableStream;\n  assert(stream !== undefined);\n  assert(stream._writer === writer);\n\n  const releasedError = new TypeError(\n    `Writer was released and can no longer be used to monitor the stream's closedness`);\n\n  WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, releasedError);\n\n  // The state transitions to \"errored\" before the sink abort() method runs, but the writer.closed promise is not\n  // rejected until afterwards. This means that simply testing state will not work.\n  WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, releasedError);\n\n  stream._writer = undefined;\n  writer._ownerWritableStream = undefined!;\n}\n\nfunction WritableStreamDefaultWriterWrite<W>(writer: WritableStreamDefaultWriter<W>, chunk: W): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  const controller = stream._writableStreamController;\n\n  const chunkSize = WritableStreamDefaultControllerGetChunkSize(controller, chunk);\n\n  if (stream !== writer._ownerWritableStream) {\n    return promiseRejectedWith(defaultWriterLockException('write to'));\n  }\n\n  const state = stream._state;\n  if (state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n  if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {\n    return promiseRejectedWith(new TypeError('The stream is closing or closed and cannot be written to'));\n  }\n  if (state === 'erroring') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  assert(state === 'writable');\n\n  const promise = WritableStreamAddWriteRequest(stream);\n\n  WritableStreamDefaultControllerWrite(controller, chunk, chunkSize);\n\n  return promise;\n}\n\nconst closeSentinel: unique symbol = {} as any;\n\ntype QueueRecord<W> = W | typeof closeSentinel;\n\n/**\n * Allows control of a {@link WritableStream | writable stream}'s state and internal queue.\n *\n * @public\n */\nexport class WritableStreamDefaultController<W = any> {\n  /** @internal */\n  _controlledWritableStream!: WritableStream<W>;\n  /** @internal */\n  _queue!: SimpleQueue<QueuePair<QueueRecord<W>>>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _abortReason: any;\n  /** @internal */\n  _abortController: AbortController | undefined;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _strategySizeAlgorithm!: QueuingStrategySizeCallback<W>;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _writeAlgorithm!: (chunk: W) => Promise<void>;\n  /** @internal */\n  _closeAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _abortAlgorithm!: (reason: any) => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * The reason which was passed to `WritableStream.abort(reason)` when the stream was aborted.\n   *\n   * @deprecated\n   *  This property has been removed from the specification, see https://github.com/whatwg/streams/pull/1177.\n   *  Use {@link WritableStreamDefaultController.signal}'s `reason` instead.\n   */\n  get abortReason(): any {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('abortReason');\n    }\n    return this._abortReason;\n  }\n\n  /**\n   * An `AbortSignal` that can be used to abort the pending write or close operation when the stream is aborted.\n   */\n  get signal(): AbortSignal {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('signal');\n    }\n    if (this._abortController === undefined) {\n      // Older browsers or older Node versions may not support `AbortController` or `AbortSignal`.\n      // We don't want to bundle and ship an `AbortController` polyfill together with our polyfill,\n      // so instead we only implement support for `signal` if we find a global `AbortController` constructor.\n      throw new TypeError('WritableStreamDefaultController.prototype.signal is not supported');\n    }\n    return this._abortController.signal;\n  }\n\n  /**\n   * Closes the controlled writable stream, making all future interactions with it fail with the given error `e`.\n   *\n   * This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying\n   * sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the\n   * normal lifecycle of interactions with the underlying sink.\n   */\n  error(e: any = undefined): void {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n    const state = this._controlledWritableStream._state;\n    if (state !== 'writable') {\n      // The stream is closed, errored or will be soon. The sink can't do anything useful if it gets an error here, so\n      // just treat it as a no-op.\n      return;\n    }\n\n    WritableStreamDefaultControllerError(this, e);\n  }\n\n  /** @internal */\n  [AbortSteps](reason: any): Promise<void> {\n    const result = this._abortAlgorithm(reason);\n    WritableStreamDefaultControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [ErrorSteps]() {\n    ResetQueue(this);\n  }\n}\n\nObject.defineProperties(WritableStreamDefaultController.prototype, {\n  abortReason: { enumerable: true },\n  signal: { enumerable: true },\n  error: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'WritableStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Abstract operations implementing interface required by the WritableStream.\n\nfunction IsWritableStreamDefaultController(x: any): x is WritableStreamDefaultController<any> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledWritableStream')) {\n    return false;\n  }\n\n  return x instanceof WritableStreamDefaultController;\n}\n\nfunction SetUpWritableStreamDefaultController<W>(stream: WritableStream<W>,\n                                                 controller: WritableStreamDefaultController<W>,\n                                                 startAlgorithm: () => void | PromiseLike<void>,\n                                                 writeAlgorithm: (chunk: W) => Promise<void>,\n                                                 closeAlgorithm: () => Promise<void>,\n                                                 abortAlgorithm: (reason: any) => Promise<void>,\n                                                 highWaterMark: number,\n                                                 sizeAlgorithm: QueuingStrategySizeCallback<W>) {\n  assert(IsWritableStream(stream));\n  assert(stream._writableStreamController === undefined);\n\n  controller._controlledWritableStream = stream;\n  stream._writableStreamController = controller;\n\n  // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n  controller._queue = undefined!;\n  controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._abortReason = undefined;\n  controller._abortController = createAbortController();\n  controller._started = false;\n\n  controller._strategySizeAlgorithm = sizeAlgorithm;\n  controller._strategyHWM = highWaterMark;\n\n  controller._writeAlgorithm = writeAlgorithm;\n  controller._closeAlgorithm = closeAlgorithm;\n  controller._abortAlgorithm = abortAlgorithm;\n\n  const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n  WritableStreamUpdateBackpressure(stream, backpressure);\n\n  const startResult = startAlgorithm();\n  const startPromise = promiseResolvedWith(startResult);\n  uponPromise(\n    startPromise,\n    () => {\n      assert(stream._state === 'writable' || stream._state === 'erroring');\n      controller._started = true;\n      WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n    },\n    r => {\n      assert(stream._state === 'writable' || stream._state === 'erroring');\n      controller._started = true;\n      WritableStreamDealWithRejection(stream, r);\n    }\n  );\n}\n\nfunction SetUpWritableStreamDefaultControllerFromUnderlyingSink<W>(stream: WritableStream<W>,\n                                                                   underlyingSink: ValidatedUnderlyingSink<W>,\n                                                                   highWaterMark: number,\n                                                                   sizeAlgorithm: QueuingStrategySizeCallback<W>) {\n  const controller = Object.create(WritableStreamDefaultController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let writeAlgorithm: (chunk: W) => Promise<void> = () => promiseResolvedWith(undefined);\n  let closeAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let abortAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingSink.start !== undefined) {\n    startAlgorithm = () => underlyingSink.start!(controller);\n  }\n  if (underlyingSink.write !== undefined) {\n    writeAlgorithm = chunk => underlyingSink.write!(chunk, controller);\n  }\n  if (underlyingSink.close !== undefined) {\n    closeAlgorithm = () => underlyingSink.close!();\n  }\n  if (underlyingSink.abort !== undefined) {\n    abortAlgorithm = reason => underlyingSink.abort!(reason);\n  }\n\n  SetUpWritableStreamDefaultController(\n    stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm\n  );\n}\n\n// ClearAlgorithms may be called twice. Erroring the same stream in multiple ways will often result in redundant calls.\nfunction WritableStreamDefaultControllerClearAlgorithms(controller: WritableStreamDefaultController<any>) {\n  controller._writeAlgorithm = undefined!;\n  controller._closeAlgorithm = undefined!;\n  controller._abortAlgorithm = undefined!;\n  controller._strategySizeAlgorithm = undefined!;\n}\n\nfunction WritableStreamDefaultControllerClose<W>(controller: WritableStreamDefaultController<W>) {\n  EnqueueValueWithSize(controller, closeSentinel, 0);\n  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\nfunction WritableStreamDefaultControllerGetChunkSize<W>(controller: WritableStreamDefaultController<W>,\n                                                        chunk: W): number {\n  try {\n    return controller._strategySizeAlgorithm(chunk);\n  } catch (chunkSizeE) {\n    WritableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE);\n    return 1;\n  }\n}\n\nfunction WritableStreamDefaultControllerGetDesiredSize(controller: WritableStreamDefaultController<any>): number {\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\nfunction WritableStreamDefaultControllerWrite<W>(controller: WritableStreamDefaultController<W>,\n                                                 chunk: W,\n                                                 chunkSize: number) {\n  try {\n    EnqueueValueWithSize(controller, chunk, chunkSize);\n  } catch (enqueueE) {\n    WritableStreamDefaultControllerErrorIfNeeded(controller, enqueueE);\n    return;\n  }\n\n  const stream = controller._controlledWritableStream;\n  if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._state === 'writable') {\n    const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n    WritableStreamUpdateBackpressure(stream, backpressure);\n  }\n\n  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\n// Abstract operations for the WritableStreamDefaultController.\n\nfunction WritableStreamDefaultControllerAdvanceQueueIfNeeded<W>(controller: WritableStreamDefaultController<W>) {\n  const stream = controller._controlledWritableStream;\n\n  if (!controller._started) {\n    return;\n  }\n\n  if (stream._inFlightWriteRequest !== undefined) {\n    return;\n  }\n\n  const state = stream._state;\n  assert(state !== 'closed' && state !== 'errored');\n  if (state === 'erroring') {\n    WritableStreamFinishErroring(stream);\n    return;\n  }\n\n  if (controller._queue.length === 0) {\n    return;\n  }\n\n  const value = PeekQueueValue(controller);\n  if (value === closeSentinel) {\n    WritableStreamDefaultControllerProcessClose(controller);\n  } else {\n    WritableStreamDefaultControllerProcessWrite(controller, value);\n  }\n}\n\nfunction WritableStreamDefaultControllerErrorIfNeeded(controller: WritableStreamDefaultController<any>, error: any) {\n  if (controller._controlledWritableStream._state === 'writable') {\n    WritableStreamDefaultControllerError(controller, error);\n  }\n}\n\nfunction WritableStreamDefaultControllerProcessClose(controller: WritableStreamDefaultController<any>) {\n  const stream = controller._controlledWritableStream;\n\n  WritableStreamMarkCloseRequestInFlight(stream);\n\n  DequeueValue(controller);\n  assert(controller._queue.length === 0);\n\n  const sinkClosePromise = controller._closeAlgorithm();\n  WritableStreamDefaultControllerClearAlgorithms(controller);\n  uponPromise(\n    sinkClosePromise,\n    () => {\n      WritableStreamFinishInFlightClose(stream);\n    },\n    reason => {\n      WritableStreamFinishInFlightCloseWithError(stream, reason);\n    }\n  );\n}\n\nfunction WritableStreamDefaultControllerProcessWrite<W>(controller: WritableStreamDefaultController<W>, chunk: W) {\n  const stream = controller._controlledWritableStream;\n\n  WritableStreamMarkFirstWriteRequestInFlight(stream);\n\n  const sinkWritePromise = controller._writeAlgorithm(chunk);\n  uponPromise(\n    sinkWritePromise,\n    () => {\n      WritableStreamFinishInFlightWrite(stream);\n\n      const state = stream._state;\n      assert(state === 'writable' || state === 'erroring');\n\n      DequeueValue(controller);\n\n      if (!WritableStreamCloseQueuedOrInFlight(stream) && state === 'writable') {\n        const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n        WritableStreamUpdateBackpressure(stream, backpressure);\n      }\n\n      WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n    },\n    reason => {\n      if (stream._state === 'writable') {\n        WritableStreamDefaultControllerClearAlgorithms(controller);\n      }\n      WritableStreamFinishInFlightWriteWithError(stream, reason);\n    }\n  );\n}\n\nfunction WritableStreamDefaultControllerGetBackpressure(controller: WritableStreamDefaultController<any>): boolean {\n  const desiredSize = WritableStreamDefaultControllerGetDesiredSize(controller);\n  return desiredSize <= 0;\n}\n\n// A client of WritableStreamDefaultController may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultControllerError(controller: WritableStreamDefaultController<any>, error: any) {\n  const stream = controller._controlledWritableStream;\n\n  assert(stream._state === 'writable');\n\n  WritableStreamDefaultControllerClearAlgorithms(controller);\n  WritableStreamStartErroring(stream, error);\n}\n\n// Helper functions for the WritableStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(`WritableStream.prototype.${name} can only be used on a WritableStream`);\n}\n\n// Helper functions for the WritableStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `WritableStreamDefaultController.prototype.${name} can only be used on a WritableStreamDefaultController`);\n}\n\n\n// Helper functions for the WritableStreamDefaultWriter.\n\nfunction defaultWriterBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `WritableStreamDefaultWriter.prototype.${name} can only be used on a WritableStreamDefaultWriter`);\n}\n\nfunction defaultWriterLockException(name: string): TypeError {\n  return new TypeError('Cannot ' + name + ' a stream using a released writer');\n}\n\nfunction defaultWriterClosedPromiseInitialize(writer: WritableStreamDefaultWriter) {\n  writer._closedPromise = newPromise((resolve, reject) => {\n    writer._closedPromise_resolve = resolve;\n    writer._closedPromise_reject = reject;\n    writer._closedPromiseState = 'pending';\n  });\n}\n\nfunction defaultWriterClosedPromiseInitializeAsRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  defaultWriterClosedPromiseInitialize(writer);\n  defaultWriterClosedPromiseReject(writer, reason);\n}\n\nfunction defaultWriterClosedPromiseInitializeAsResolved(writer: WritableStreamDefaultWriter) {\n  defaultWriterClosedPromiseInitialize(writer);\n  defaultWriterClosedPromiseResolve(writer);\n}\n\nfunction defaultWriterClosedPromiseReject(writer: WritableStreamDefaultWriter, reason: any) {\n  if (writer._closedPromise_reject === undefined) {\n    return;\n  }\n  assert(writer._closedPromiseState === 'pending');\n\n  setPromiseIsHandledToTrue(writer._closedPromise);\n  writer._closedPromise_reject(reason);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'rejected';\n}\n\nfunction defaultWriterClosedPromiseResetToRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  assert(writer._closedPromise_resolve === undefined);\n  assert(writer._closedPromise_reject === undefined);\n  assert(writer._closedPromiseState !== 'pending');\n\n  defaultWriterClosedPromiseInitializeAsRejected(writer, reason);\n}\n\nfunction defaultWriterClosedPromiseResolve(writer: WritableStreamDefaultWriter) {\n  if (writer._closedPromise_resolve === undefined) {\n    return;\n  }\n  assert(writer._closedPromiseState === 'pending');\n\n  writer._closedPromise_resolve(undefined);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'resolved';\n}\n\nfunction defaultWriterReadyPromiseInitialize(writer: WritableStreamDefaultWriter) {\n  writer._readyPromise = newPromise((resolve, reject) => {\n    writer._readyPromise_resolve = resolve;\n    writer._readyPromise_reject = reject;\n  });\n  writer._readyPromiseState = 'pending';\n}\n\nfunction defaultWriterReadyPromiseInitializeAsRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  defaultWriterReadyPromiseInitialize(writer);\n  defaultWriterReadyPromiseReject(writer, reason);\n}\n\nfunction defaultWriterReadyPromiseInitializeAsResolved(writer: WritableStreamDefaultWriter) {\n  defaultWriterReadyPromiseInitialize(writer);\n  defaultWriterReadyPromiseResolve(writer);\n}\n\nfunction defaultWriterReadyPromiseReject(writer: WritableStreamDefaultWriter, reason: any) {\n  if (writer._readyPromise_reject === undefined) {\n    return;\n  }\n\n  setPromiseIsHandledToTrue(writer._readyPromise);\n  writer._readyPromise_reject(reason);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'rejected';\n}\n\nfunction defaultWriterReadyPromiseReset(writer: WritableStreamDefaultWriter) {\n  assert(writer._readyPromise_resolve === undefined);\n  assert(writer._readyPromise_reject === undefined);\n\n  defaultWriterReadyPromiseInitialize(writer);\n}\n\nfunction defaultWriterReadyPromiseResetToRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  assert(writer._readyPromise_resolve === undefined);\n  assert(writer._readyPromise_reject === undefined);\n\n  defaultWriterReadyPromiseInitializeAsRejected(writer, reason);\n}\n\nfunction defaultWriterReadyPromiseResolve(writer: WritableStreamDefaultWriter) {\n  if (writer._readyPromise_resolve === undefined) {\n    return;\n  }\n\n  writer._readyPromise_resolve(undefined);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'fulfilled';\n}\n","/// <reference lib=\"dom\" />\nexport const NativeDOMException: typeof DOMException | undefined =\n  typeof DOMException !== 'undefined' ? DOMException : undefined;\n","/// <reference types=\"node\" />\nimport { NativeDOMException } from './native';\n\ndeclare class DOMExceptionClass extends Error {\n  constructor(message?: string, name?: string);\n\n  name: string;\n  message: string;\n}\n\ntype DOMException = DOMExceptionClass;\ntype DOMExceptionConstructor = typeof DOMExceptionClass;\n\nfunction isDOMExceptionConstructor(ctor: unknown): ctor is DOMExceptionConstructor {\n  if (!(typeof ctor === 'function' || typeof ctor === 'object')) {\n    return false;\n  }\n  try {\n    new (ctor as DOMExceptionConstructor)();\n    return true;\n  } catch {\n    return false;\n  }\n}\n\nfunction createDOMExceptionPolyfill(): DOMExceptionConstructor {\n  // eslint-disable-next-line no-shadow\n  const ctor = function DOMException(this: DOMException, message?: string, name?: string) {\n    this.message = message || '';\n    this.name = name || 'Error';\n    if (Error.captureStackTrace) {\n      Error.captureStackTrace(this, this.constructor);\n    }\n  } as any;\n  ctor.prototype = Object.create(Error.prototype);\n  Object.defineProperty(ctor.prototype, 'constructor', { value: ctor, writable: true, configurable: true });\n  return ctor;\n}\n\n// eslint-disable-next-line no-redeclare\nconst DOMException: DOMExceptionConstructor =\n  isDOMExceptionConstructor(NativeDOMException) ? NativeDOMException : createDOMExceptionPolyfill();\n\nexport { DOMException };\n","import { IsReadableStream, IsReadableStreamLocked, ReadableStream, ReadableStreamCancel } from '../readable-stream';\nimport { AcquireReadableStreamDefaultReader, ReadableStreamDefaultReaderRead } from './default-reader';\nimport { ReadableStreamReaderGenericRelease } from './generic-reader';\nimport {\n  AcquireWritableStreamDefaultWriter,\n  IsWritableStream,\n  IsWritableStreamLocked,\n  WritableStream,\n  WritableStreamAbort,\n  WritableStreamCloseQueuedOrInFlight,\n  WritableStreamDefaultWriterCloseWithErrorPropagation,\n  WritableStreamDefaultWriterRelease,\n  WritableStreamDefaultWriterWrite\n} from '../writable-stream';\nimport assert from '../../stub/assert';\nimport {\n  newPromise,\n  PerformPromiseThen,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  uponFulfillment,\n  uponPromise,\n  uponRejection\n} from '../helpers/webidl';\nimport { noop } from '../../utils';\nimport { AbortSignal, isAbortSignal } from '../abort-signal';\nimport { DOMException } from '../../stub/dom-exception';\n\nexport function ReadableStreamPipeTo<T>(source: ReadableStream<T>,\n                                        dest: WritableStream<T>,\n                                        preventClose: boolean,\n                                        preventAbort: boolean,\n                                        preventCancel: boolean,\n                                        signal: AbortSignal | undefined): Promise<undefined> {\n  assert(IsReadableStream(source));\n  assert(IsWritableStream(dest));\n  assert(typeof preventClose === 'boolean');\n  assert(typeof preventAbort === 'boolean');\n  assert(typeof preventCancel === 'boolean');\n  assert(signal === undefined || isAbortSignal(signal));\n  assert(!IsReadableStreamLocked(source));\n  assert(!IsWritableStreamLocked(dest));\n\n  const reader = AcquireReadableStreamDefaultReader<T>(source);\n  const writer = AcquireWritableStreamDefaultWriter<T>(dest);\n\n  source._disturbed = true;\n\n  let shuttingDown = false;\n\n  // This is used to keep track of the spec's requirement that we wait for ongoing writes during shutdown.\n  let currentWrite = promiseResolvedWith<void>(undefined);\n\n  return newPromise((resolve, reject) => {\n    let abortAlgorithm: () => void;\n    if (signal !== undefined) {\n      abortAlgorithm = () => {\n        const error = new DOMException('Aborted', 'AbortError');\n        const actions: Array<() => Promise<void>> = [];\n        if (!preventAbort) {\n          actions.push(() => {\n            if (dest._state === 'writable') {\n              return WritableStreamAbort(dest, error);\n            }\n            return promiseResolvedWith(undefined);\n          });\n        }\n        if (!preventCancel) {\n          actions.push(() => {\n            if (source._state === 'readable') {\n              return ReadableStreamCancel(source, error);\n            }\n            return promiseResolvedWith(undefined);\n          });\n        }\n        shutdownWithAction(() => Promise.all(actions.map(action => action())), true, error);\n      };\n\n      if (signal.aborted) {\n        abortAlgorithm();\n        return;\n      }\n\n      signal.addEventListener('abort', abortAlgorithm);\n    }\n\n    // Using reader and writer, read all chunks from this and write them to dest\n    // - Backpressure must be enforced\n    // - Shutdown must stop all activity\n    function pipeLoop() {\n      return newPromise<void>((resolveLoop, rejectLoop) => {\n        function next(done: boolean) {\n          if (done) {\n            resolveLoop();\n          } else {\n            // Use `PerformPromiseThen` instead of `uponPromise` to avoid\n            // adding unnecessary `.catch(rethrowAssertionErrorRejection)` handlers\n            PerformPromiseThen(pipeStep(), next, rejectLoop);\n          }\n        }\n\n        next(false);\n      });\n    }\n\n    function pipeStep(): Promise<boolean> {\n      if (shuttingDown) {\n        return promiseResolvedWith(true);\n      }\n\n      return PerformPromiseThen(writer._readyPromise, () => {\n        return newPromise<boolean>((resolveRead, rejectRead) => {\n          ReadableStreamDefaultReaderRead(\n            reader,\n            {\n              _chunkSteps: chunk => {\n                currentWrite = PerformPromiseThen(WritableStreamDefaultWriterWrite(writer, chunk), undefined, noop);\n                resolveRead(false);\n              },\n              _closeSteps: () => resolveRead(true),\n              _errorSteps: rejectRead\n            }\n          );\n        });\n      });\n    }\n\n    // Errors must be propagated forward\n    isOrBecomesErrored(source, reader._closedPromise, storedError => {\n      if (!preventAbort) {\n        shutdownWithAction(() => WritableStreamAbort(dest, storedError), true, storedError);\n      } else {\n        shutdown(true, storedError);\n      }\n    });\n\n    // Errors must be propagated backward\n    isOrBecomesErrored(dest, writer._closedPromise, storedError => {\n      if (!preventCancel) {\n        shutdownWithAction(() => ReadableStreamCancel(source, storedError), true, storedError);\n      } else {\n        shutdown(true, storedError);\n      }\n    });\n\n    // Closing must be propagated forward\n    isOrBecomesClosed(source, reader._closedPromise, () => {\n      if (!preventClose) {\n        shutdownWithAction(() => WritableStreamDefaultWriterCloseWithErrorPropagation(writer));\n      } else {\n        shutdown();\n      }\n    });\n\n    // Closing must be propagated backward\n    if (WritableStreamCloseQueuedOrInFlight(dest) || dest._state === 'closed') {\n      const destClosed = new TypeError('the destination writable stream closed before all data could be piped to it');\n\n      if (!preventCancel) {\n        shutdownWithAction(() => ReadableStreamCancel(source, destClosed), true, destClosed);\n      } else {\n        shutdown(true, destClosed);\n      }\n    }\n\n    setPromiseIsHandledToTrue(pipeLoop());\n\n    function waitForWritesToFinish(): Promise<void> {\n      // Another write may have started while we were waiting on this currentWrite, so we have to be sure to wait\n      // for that too.\n      const oldCurrentWrite = currentWrite;\n      return PerformPromiseThen(\n        currentWrite,\n        () => oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined\n      );\n    }\n\n    function isOrBecomesErrored(stream: ReadableStream | WritableStream,\n                                promise: Promise<void>,\n                                action: (reason: any) => void) {\n      if (stream._state === 'errored') {\n        action(stream._storedError);\n      } else {\n        uponRejection(promise, action);\n      }\n    }\n\n    function isOrBecomesClosed(stream: ReadableStream | WritableStream, promise: Promise<void>, action: () => void) {\n      if (stream._state === 'closed') {\n        action();\n      } else {\n        uponFulfillment(promise, action);\n      }\n    }\n\n    function shutdownWithAction(action: () => Promise<unknown>, originalIsError?: boolean, originalError?: any) {\n      if (shuttingDown) {\n        return;\n      }\n      shuttingDown = true;\n\n      if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {\n        uponFulfillment(waitForWritesToFinish(), doTheRest);\n      } else {\n        doTheRest();\n      }\n\n      function doTheRest() {\n        uponPromise(\n          action(),\n          () => finalize(originalIsError, originalError),\n          newError => finalize(true, newError)\n        );\n      }\n    }\n\n    function shutdown(isError?: boolean, error?: any) {\n      if (shuttingDown) {\n        return;\n      }\n      shuttingDown = true;\n\n      if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {\n        uponFulfillment(waitForWritesToFinish(), () => finalize(isError, error));\n      } else {\n        finalize(isError, error);\n      }\n    }\n\n    function finalize(isError?: boolean, error?: any) {\n      WritableStreamDefaultWriterRelease(writer);\n      ReadableStreamReaderGenericRelease(reader);\n\n      if (signal !== undefined) {\n        signal.removeEventListener('abort', abortAlgorithm);\n      }\n      if (isError) {\n        reject(error);\n      } else {\n        resolve(undefined);\n      }\n    }\n  });\n}\n","import { QueuingStrategySizeCallback } from '../queuing-strategy';\nimport assert from '../../stub/assert';\nimport { DequeueValue, EnqueueValueWithSize, QueuePair, ResetQueue } from '../abstract-ops/queue-with-sizes';\nimport {\n  ReadableStreamAddReadRequest,\n  ReadableStreamFulfillReadRequest,\n  ReadableStreamGetNumReadRequests,\n  ReadRequest\n} from './default-reader';\nimport { SimpleQueue } from '../simple-queue';\nimport { IsReadableStreamLocked, ReadableStream, ReadableStreamClose, ReadableStreamError } from '../readable-stream';\nimport { ValidatedUnderlyingSource } from './underlying-source';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { CancelSteps, PullSteps } from '../abstract-ops/internal-methods';\nimport { promiseResolvedWith, uponPromise } from '../helpers/webidl';\n\n/**\n * Allows control of a {@link ReadableStream | readable stream}'s state and internal queue.\n *\n * @public\n */\nexport class ReadableStreamDefaultController<R> {\n  /** @internal */\n  _controlledReadableStream!: ReadableStream<R>;\n  /** @internal */\n  _queue!: SimpleQueue<QueuePair<R>>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _closeRequested!: boolean;\n  /** @internal */\n  _pullAgain!: boolean;\n  /** @internal */\n  _pulling !: boolean;\n  /** @internal */\n  _strategySizeAlgorithm!: QueuingStrategySizeCallback<R>;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _pullAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _cancelAlgorithm!: (reason: any) => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is\n   * over-full. An underlying source ought to use this information to determine when and how to apply backpressure.\n   */\n  get desiredSize(): number | null {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('desiredSize');\n    }\n\n    return ReadableStreamDefaultControllerGetDesiredSize(this);\n  }\n\n  /**\n   * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from\n   * the stream, but once those are read, the stream will become closed.\n   */\n  close(): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('close');\n    }\n\n    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {\n      throw new TypeError('The stream is not in a state that permits close');\n    }\n\n    ReadableStreamDefaultControllerClose(this);\n  }\n\n  /**\n   * Enqueues the given chunk `chunk` in the controlled readable stream.\n   */\n  enqueue(chunk: R): void;\n  enqueue(chunk: R = undefined!): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('enqueue');\n    }\n\n    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {\n      throw new TypeError('The stream is not in a state that permits enqueue');\n    }\n\n    return ReadableStreamDefaultControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.\n   */\n  error(e: any = undefined): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n\n    ReadableStreamDefaultControllerError(this, e);\n  }\n\n  /** @internal */\n  [CancelSteps](reason: any): Promise<void> {\n    ResetQueue(this);\n    const result = this._cancelAlgorithm(reason);\n    ReadableStreamDefaultControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [PullSteps](readRequest: ReadRequest<R>): void {\n    const stream = this._controlledReadableStream;\n\n    if (this._queue.length > 0) {\n      const chunk = DequeueValue(this);\n\n      if (this._closeRequested && this._queue.length === 0) {\n        ReadableStreamDefaultControllerClearAlgorithms(this);\n        ReadableStreamClose(stream);\n      } else {\n        ReadableStreamDefaultControllerCallPullIfNeeded(this);\n      }\n\n      readRequest._chunkSteps(chunk);\n    } else {\n      ReadableStreamAddReadRequest(stream, readRequest);\n      ReadableStreamDefaultControllerCallPullIfNeeded(this);\n    }\n  }\n}\n\nObject.defineProperties(ReadableStreamDefaultController.prototype, {\n  close: { enumerable: true },\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Abstract operations for the ReadableStreamDefaultController.\n\nfunction IsReadableStreamDefaultController<R = any>(x: any): x is ReadableStreamDefaultController<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableStream')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamDefaultController;\n}\n\nfunction ReadableStreamDefaultControllerCallPullIfNeeded(controller: ReadableStreamDefaultController<any>): void {\n  const shouldPull = ReadableStreamDefaultControllerShouldCallPull(controller);\n  if (!shouldPull) {\n    return;\n  }\n\n  if (controller._pulling) {\n    controller._pullAgain = true;\n    return;\n  }\n\n  assert(!controller._pullAgain);\n\n  controller._pulling = true;\n\n  const pullPromise = controller._pullAlgorithm();\n  uponPromise(\n    pullPromise,\n    () => {\n      controller._pulling = false;\n\n      if (controller._pullAgain) {\n        controller._pullAgain = false;\n        ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n      }\n    },\n    e => {\n      ReadableStreamDefaultControllerError(controller, e);\n    }\n  );\n}\n\nfunction ReadableStreamDefaultControllerShouldCallPull(controller: ReadableStreamDefaultController<any>): boolean {\n  const stream = controller._controlledReadableStream;\n\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return false;\n  }\n\n  if (!controller._started) {\n    return false;\n  }\n\n  if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    return true;\n  }\n\n  const desiredSize = ReadableStreamDefaultControllerGetDesiredSize(controller);\n  assert(desiredSize !== null);\n  if (desiredSize! > 0) {\n    return true;\n  }\n\n  return false;\n}\n\nfunction ReadableStreamDefaultControllerClearAlgorithms(controller: ReadableStreamDefaultController<any>) {\n  controller._pullAlgorithm = undefined!;\n  controller._cancelAlgorithm = undefined!;\n  controller._strategySizeAlgorithm = undefined!;\n}\n\n// A client of ReadableStreamDefaultController may use these functions directly to bypass state check.\n\nexport function ReadableStreamDefaultControllerClose(controller: ReadableStreamDefaultController<any>) {\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return;\n  }\n\n  const stream = controller._controlledReadableStream;\n\n  controller._closeRequested = true;\n\n  if (controller._queue.length === 0) {\n    ReadableStreamDefaultControllerClearAlgorithms(controller);\n    ReadableStreamClose(stream);\n  }\n}\n\nexport function ReadableStreamDefaultControllerEnqueue<R>(\n  controller: ReadableStreamDefaultController<R>,\n  chunk: R\n): void {\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return;\n  }\n\n  const stream = controller._controlledReadableStream;\n\n  if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    ReadableStreamFulfillReadRequest(stream, chunk, false);\n  } else {\n    let chunkSize;\n    try {\n      chunkSize = controller._strategySizeAlgorithm(chunk);\n    } catch (chunkSizeE) {\n      ReadableStreamDefaultControllerError(controller, chunkSizeE);\n      throw chunkSizeE;\n    }\n\n    try {\n      EnqueueValueWithSize(controller, chunk, chunkSize);\n    } catch (enqueueE) {\n      ReadableStreamDefaultControllerError(controller, enqueueE);\n      throw enqueueE;\n    }\n  }\n\n  ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n}\n\nexport function ReadableStreamDefaultControllerError(controller: ReadableStreamDefaultController<any>, e: any) {\n  const stream = controller._controlledReadableStream;\n\n  if (stream._state !== 'readable') {\n    return;\n  }\n\n  ResetQueue(controller);\n\n  ReadableStreamDefaultControllerClearAlgorithms(controller);\n  ReadableStreamError(stream, e);\n}\n\nexport function ReadableStreamDefaultControllerGetDesiredSize(\n  controller: ReadableStreamDefaultController<any>\n): number | null {\n  const state = controller._controlledReadableStream._state;\n\n  if (state === 'errored') {\n    return null;\n  }\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\n// This is used in the implementation of TransformStream.\nexport function ReadableStreamDefaultControllerHasBackpressure(\n  controller: ReadableStreamDefaultController<any>\n): boolean {\n  if (ReadableStreamDefaultControllerShouldCallPull(controller)) {\n    return false;\n  }\n\n  return true;\n}\n\nexport function ReadableStreamDefaultControllerCanCloseOrEnqueue(\n  controller: ReadableStreamDefaultController<any>\n): boolean {\n  const state = controller._controlledReadableStream._state;\n\n  if (!controller._closeRequested && state === 'readable') {\n    return true;\n  }\n\n  return false;\n}\n\nexport function SetUpReadableStreamDefaultController<R>(stream: ReadableStream<R>,\n                                                        controller: ReadableStreamDefaultController<R>,\n                                                        startAlgorithm: () => void | PromiseLike<void>,\n                                                        pullAlgorithm: () => Promise<void>,\n                                                        cancelAlgorithm: (reason: any) => Promise<void>,\n                                                        highWaterMark: number,\n                                                        sizeAlgorithm: QueuingStrategySizeCallback<R>) {\n  assert(stream._readableStreamController === undefined);\n\n  controller._controlledReadableStream = stream;\n\n  controller._queue = undefined!;\n  controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._started = false;\n  controller._closeRequested = false;\n  controller._pullAgain = false;\n  controller._pulling = false;\n\n  controller._strategySizeAlgorithm = sizeAlgorithm;\n  controller._strategyHWM = highWaterMark;\n\n  controller._pullAlgorithm = pullAlgorithm;\n  controller._cancelAlgorithm = cancelAlgorithm;\n\n  stream._readableStreamController = controller;\n\n  const startResult = startAlgorithm();\n  uponPromise(\n    promiseResolvedWith(startResult),\n    () => {\n      controller._started = true;\n\n      assert(!controller._pulling);\n      assert(!controller._pullAgain);\n\n      ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n    },\n    r => {\n      ReadableStreamDefaultControllerError(controller, r);\n    }\n  );\n}\n\nexport function SetUpReadableStreamDefaultControllerFromUnderlyingSource<R>(\n  stream: ReadableStream<R>,\n  underlyingSource: ValidatedUnderlyingSource<R>,\n  highWaterMark: number,\n  sizeAlgorithm: QueuingStrategySizeCallback<R>\n) {\n  const controller: ReadableStreamDefaultController<R> = Object.create(ReadableStreamDefaultController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let pullAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let cancelAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingSource.start !== undefined) {\n    startAlgorithm = () => underlyingSource.start!(controller);\n  }\n  if (underlyingSource.pull !== undefined) {\n    pullAlgorithm = () => underlyingSource.pull!(controller);\n  }\n  if (underlyingSource.cancel !== undefined) {\n    cancelAlgorithm = reason => underlyingSource.cancel!(reason);\n  }\n\n  SetUpReadableStreamDefaultController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm\n  );\n}\n\n// Helper functions for the ReadableStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamDefaultController.prototype.${name} can only be used on a ReadableStreamDefaultController`);\n}\n","import {\n  CreateReadableByteStream,\n  CreateReadableStream,\n  IsReadableStream,\n  ReadableByteStream,\n  ReadableStream,\n  ReadableStreamCancel,\n  ReadableStreamReader\n} from '../readable-stream';\nimport { ReadableStreamReaderGenericRelease } from './generic-reader';\nimport {\n  AcquireReadableStreamDefaultReader,\n  IsReadableStreamDefaultReader,\n  ReadableStreamDefaultReaderRead,\n  ReadRequest\n} from './default-reader';\nimport {\n  AcquireReadableStreamBYOBReader,\n  IsReadableStreamBYOBReader,\n  ReadableStreamBYOBReaderRead,\n  ReadIntoRequest\n} from './byob-reader';\nimport assert from '../../stub/assert';\nimport { newPromise, promiseResolvedWith, queueMicrotask, uponRejection } from '../helpers/webidl';\nimport {\n  ReadableStreamDefaultController,\n  ReadableStreamDefaultControllerClose,\n  ReadableStreamDefaultControllerEnqueue,\n  ReadableStreamDefaultControllerError\n} from './default-controller';\nimport {\n  IsReadableByteStreamController,\n  ReadableByteStreamControllerClose,\n  ReadableByteStreamControllerEnqueue,\n  ReadableByteStreamControllerError,\n  ReadableByteStreamControllerGetBYOBRequest,\n  ReadableByteStreamControllerRespond,\n  ReadableByteStreamControllerRespondWithNewView\n} from './byte-stream-controller';\nimport { CreateArrayFromList } from '../abstract-ops/ecmascript';\nimport { CloneAsUint8Array } from '../abstract-ops/miscellaneous';\n\nexport function ReadableStreamTee<R>(stream: ReadableStream<R>,\n                                     cloneForBranch2: boolean): [ReadableStream<R>, ReadableStream<R>] {\n  assert(IsReadableStream(stream));\n  assert(typeof cloneForBranch2 === 'boolean');\n  if (IsReadableByteStreamController(stream._readableStreamController)) {\n    return ReadableByteStreamTee(stream as unknown as ReadableByteStream) as\n      unknown as [ReadableStream<R>, ReadableStream<R>];\n  }\n  return ReadableStreamDefaultTee(stream, cloneForBranch2);\n}\n\nexport function ReadableStreamDefaultTee<R>(stream: ReadableStream<R>,\n                                            cloneForBranch2: boolean): [ReadableStream<R>, ReadableStream<R>] {\n  assert(IsReadableStream(stream));\n  assert(typeof cloneForBranch2 === 'boolean');\n\n  const reader = AcquireReadableStreamDefaultReader<R>(stream);\n\n  let reading = false;\n  let readAgain = false;\n  let canceled1 = false;\n  let canceled2 = false;\n  let reason1: any;\n  let reason2: any;\n  let branch1: ReadableStream<R>;\n  let branch2: ReadableStream<R>;\n\n  let resolveCancelPromise: (value: undefined | Promise<undefined>) => void;\n  const cancelPromise = newPromise<undefined>(resolve => {\n    resolveCancelPromise = resolve;\n  });\n\n  function pullAlgorithm(): Promise<void> {\n    if (reading) {\n      readAgain = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgain = false;\n          const chunk1 = chunk;\n          const chunk2 = chunk;\n\n          // There is no way to access the cloning code right now in the reference implementation.\n          // If we add one then we'll need an implementation for serializable objects.\n          // if (!canceled2 && cloneForBranch2) {\n          //   chunk2 = StructuredDeserialize(StructuredSerialize(chunk2));\n          // }\n\n          if (!canceled1) {\n            ReadableStreamDefaultControllerEnqueue(\n              branch1._readableStreamController as ReadableStreamDefaultController<R>,\n              chunk1\n            );\n          }\n          if (!canceled2) {\n            ReadableStreamDefaultControllerEnqueue(\n              branch2._readableStreamController as ReadableStreamDefaultController<R>,\n              chunk2\n            );\n          }\n\n          reading = false;\n          if (readAgain) {\n            pullAlgorithm();\n          }\n        });\n      },\n      _closeSteps: () => {\n        reading = false;\n        if (!canceled1) {\n          ReadableStreamDefaultControllerClose(branch1._readableStreamController as ReadableStreamDefaultController<R>);\n        }\n        if (!canceled2) {\n          ReadableStreamDefaultControllerClose(branch2._readableStreamController as ReadableStreamDefaultController<R>);\n        }\n\n        if (!canceled1 || !canceled2) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function cancel1Algorithm(reason: any): Promise<void> {\n    canceled1 = true;\n    reason1 = reason;\n    if (canceled2) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function cancel2Algorithm(reason: any): Promise<void> {\n    canceled2 = true;\n    reason2 = reason;\n    if (canceled1) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function startAlgorithm() {\n    // do nothing\n  }\n\n  branch1 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel1Algorithm);\n  branch2 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel2Algorithm);\n\n  uponRejection(reader._closedPromise, (r: any) => {\n    ReadableStreamDefaultControllerError(branch1._readableStreamController as ReadableStreamDefaultController<R>, r);\n    ReadableStreamDefaultControllerError(branch2._readableStreamController as ReadableStreamDefaultController<R>, r);\n    if (!canceled1 || !canceled2) {\n      resolveCancelPromise(undefined);\n    }\n  });\n\n  return [branch1, branch2];\n}\n\nexport function ReadableByteStreamTee(stream: ReadableByteStream): [ReadableByteStream, ReadableByteStream] {\n  assert(IsReadableStream(stream));\n  assert(IsReadableByteStreamController(stream._readableStreamController));\n\n  let reader: ReadableStreamReader<Uint8Array> = AcquireReadableStreamDefaultReader(stream);\n  let reading = false;\n  let readAgainForBranch1 = false;\n  let readAgainForBranch2 = false;\n  let canceled1 = false;\n  let canceled2 = false;\n  let reason1: any;\n  let reason2: any;\n  let branch1: ReadableByteStream;\n  let branch2: ReadableByteStream;\n\n  let resolveCancelPromise: (value: undefined | Promise<undefined>) => void;\n  const cancelPromise = newPromise<void>(resolve => {\n    resolveCancelPromise = resolve;\n  });\n\n  function forwardReaderError(thisReader: ReadableStreamReader<Uint8Array>) {\n    uponRejection(thisReader._closedPromise, r => {\n      if (thisReader !== reader) {\n        return;\n      }\n      ReadableByteStreamControllerError(branch1._readableStreamController, r);\n      ReadableByteStreamControllerError(branch2._readableStreamController, r);\n      if (!canceled1 || !canceled2) {\n        resolveCancelPromise(undefined);\n      }\n    });\n  }\n\n  function pullWithDefaultReader() {\n    if (IsReadableStreamBYOBReader(reader)) {\n      assert(reader._readIntoRequests.length === 0);\n      ReadableStreamReaderGenericRelease(reader);\n\n      reader = AcquireReadableStreamDefaultReader(stream);\n      forwardReaderError(reader);\n    }\n\n    const readRequest: ReadRequest<Uint8Array> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgainForBranch1 = false;\n          readAgainForBranch2 = false;\n\n          const chunk1 = chunk;\n          let chunk2 = chunk;\n          if (!canceled1 && !canceled2) {\n            try {\n              chunk2 = CloneAsUint8Array(chunk);\n            } catch (cloneE) {\n              ReadableByteStreamControllerError(branch1._readableStreamController, cloneE);\n              ReadableByteStreamControllerError(branch2._readableStreamController, cloneE);\n              resolveCancelPromise(ReadableStreamCancel(stream, cloneE));\n              return;\n            }\n          }\n\n          if (!canceled1) {\n            ReadableByteStreamControllerEnqueue(branch1._readableStreamController, chunk1);\n          }\n          if (!canceled2) {\n            ReadableByteStreamControllerEnqueue(branch2._readableStreamController, chunk2);\n          }\n\n          reading = false;\n          if (readAgainForBranch1) {\n            pull1Algorithm();\n          } else if (readAgainForBranch2) {\n            pull2Algorithm();\n          }\n        });\n      },\n      _closeSteps: () => {\n        reading = false;\n        if (!canceled1) {\n          ReadableByteStreamControllerClose(branch1._readableStreamController);\n        }\n        if (!canceled2) {\n          ReadableByteStreamControllerClose(branch2._readableStreamController);\n        }\n        if (branch1._readableStreamController._pendingPullIntos.length > 0) {\n          ReadableByteStreamControllerRespond(branch1._readableStreamController, 0);\n        }\n        if (branch2._readableStreamController._pendingPullIntos.length > 0) {\n          ReadableByteStreamControllerRespond(branch2._readableStreamController, 0);\n        }\n        if (!canceled1 || !canceled2) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n  }\n\n  function pullWithBYOBReader(view: ArrayBufferView, forBranch2: boolean) {\n    if (IsReadableStreamDefaultReader<Uint8Array>(reader)) {\n      assert(reader._readRequests.length === 0);\n      ReadableStreamReaderGenericRelease(reader);\n\n      reader = AcquireReadableStreamBYOBReader(stream);\n      forwardReaderError(reader);\n    }\n\n    const byobBranch = forBranch2 ? branch2 : branch1;\n    const otherBranch = forBranch2 ? branch1 : branch2;\n\n    const readIntoRequest: ReadIntoRequest<ArrayBufferView> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgainForBranch1 = false;\n          readAgainForBranch2 = false;\n\n          const byobCanceled = forBranch2 ? canceled2 : canceled1;\n          const otherCanceled = forBranch2 ? canceled1 : canceled2;\n\n          if (!otherCanceled) {\n            let clonedChunk;\n            try {\n              clonedChunk = CloneAsUint8Array(chunk);\n            } catch (cloneE) {\n              ReadableByteStreamControllerError(byobBranch._readableStreamController, cloneE);\n              ReadableByteStreamControllerError(otherBranch._readableStreamController, cloneE);\n              resolveCancelPromise(ReadableStreamCancel(stream, cloneE));\n              return;\n            }\n            if (!byobCanceled) {\n              ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n            }\n            ReadableByteStreamControllerEnqueue(otherBranch._readableStreamController, clonedChunk);\n          } else if (!byobCanceled) {\n            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n          }\n\n          reading = false;\n          if (readAgainForBranch1) {\n            pull1Algorithm();\n          } else if (readAgainForBranch2) {\n            pull2Algorithm();\n          }\n        });\n      },\n      _closeSteps: chunk => {\n        reading = false;\n\n        const byobCanceled = forBranch2 ? canceled2 : canceled1;\n        const otherCanceled = forBranch2 ? canceled1 : canceled2;\n\n        if (!byobCanceled) {\n          ReadableByteStreamControllerClose(byobBranch._readableStreamController);\n        }\n        if (!otherCanceled) {\n          ReadableByteStreamControllerClose(otherBranch._readableStreamController);\n        }\n\n        if (chunk !== undefined) {\n          assert(chunk.byteLength === 0);\n\n          if (!byobCanceled) {\n            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n          }\n          if (!otherCanceled && otherBranch._readableStreamController._pendingPullIntos.length > 0) {\n            ReadableByteStreamControllerRespond(otherBranch._readableStreamController, 0);\n          }\n        }\n\n        if (!byobCanceled || !otherCanceled) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamBYOBReaderRead(reader, view, readIntoRequest);\n  }\n\n  function pull1Algorithm(): Promise<void> {\n    if (reading) {\n      readAgainForBranch1 = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch1._readableStreamController);\n    if (byobRequest === null) {\n      pullWithDefaultReader();\n    } else {\n      pullWithBYOBReader(byobRequest._view!, false);\n    }\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function pull2Algorithm(): Promise<void> {\n    if (reading) {\n      readAgainForBranch2 = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch2._readableStreamController);\n    if (byobRequest === null) {\n      pullWithDefaultReader();\n    } else {\n      pullWithBYOBReader(byobRequest._view!, true);\n    }\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function cancel1Algorithm(reason: any): Promise<void> {\n    canceled1 = true;\n    reason1 = reason;\n    if (canceled2) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function cancel2Algorithm(reason: any): Promise<void> {\n    canceled2 = true;\n    reason2 = reason;\n    if (canceled1) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function startAlgorithm(): void {\n    return;\n  }\n\n  branch1 = CreateReadableByteStream(startAlgorithm, pull1Algorithm, cancel1Algorithm);\n  branch2 = CreateReadableByteStream(startAlgorithm, pull2Algorithm, cancel2Algorithm);\n\n  forwardReaderError(reader);\n\n  return [branch1, branch2];\n}\n","import { assertDictionary, assertFunction, convertUnsignedLongLongWithEnforceRange } from './basic';\nimport {\n  ReadableStreamController,\n  UnderlyingByteSource,\n  UnderlyingDefaultOrByteSource,\n  UnderlyingDefaultOrByteSourcePullCallback,\n  UnderlyingDefaultOrByteSourceStartCallback,\n  UnderlyingSource,\n  UnderlyingSourceCancelCallback,\n  ValidatedUnderlyingDefaultOrByteSource\n} from '../readable-stream/underlying-source';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\n\nexport function convertUnderlyingDefaultOrByteSource<R>(\n  source: UnderlyingSource<R> | UnderlyingByteSource | null,\n  context: string\n): ValidatedUnderlyingDefaultOrByteSource<R> {\n  assertDictionary(source, context);\n  const original = source as (UnderlyingDefaultOrByteSource<R> | null);\n  const autoAllocateChunkSize = original?.autoAllocateChunkSize;\n  const cancel = original?.cancel;\n  const pull = original?.pull;\n  const start = original?.start;\n  const type = original?.type;\n  return {\n    autoAllocateChunkSize: autoAllocateChunkSize === undefined ?\n      undefined :\n      convertUnsignedLongLongWithEnforceRange(\n        autoAllocateChunkSize,\n        `${context} has member 'autoAllocateChunkSize' that`\n      ),\n    cancel: cancel === undefined ?\n      undefined :\n      convertUnderlyingSourceCancelCallback(cancel, original!, `${context} has member 'cancel' that`),\n    pull: pull === undefined ?\n      undefined :\n      convertUnderlyingSourcePullCallback(pull, original!, `${context} has member 'pull' that`),\n    start: start === undefined ?\n      undefined :\n      convertUnderlyingSourceStartCallback(start, original!, `${context} has member 'start' that`),\n    type: type === undefined ? undefined : convertReadableStreamType(type, `${context} has member 'type' that`)\n  };\n}\n\nfunction convertUnderlyingSourceCancelCallback(\n  fn: UnderlyingSourceCancelCallback,\n  original: UnderlyingDefaultOrByteSource,\n  context: string\n): (reason: any) => Promise<void> {\n  assertFunction(fn, context);\n  return (reason: any) => promiseCall(fn, original, [reason]);\n}\n\nfunction convertUnderlyingSourcePullCallback<R>(\n  fn: UnderlyingDefaultOrByteSourcePullCallback<R>,\n  original: UnderlyingDefaultOrByteSource<R>,\n  context: string\n): (controller: ReadableStreamController<R>) => Promise<void> {\n  assertFunction(fn, context);\n  return (controller: ReadableStreamController<R>) => promiseCall(fn, original, [controller]);\n}\n\nfunction convertUnderlyingSourceStartCallback<R>(\n  fn: UnderlyingDefaultOrByteSourceStartCallback<R>,\n  original: UnderlyingDefaultOrByteSource<R>,\n  context: string\n): UnderlyingDefaultOrByteSourceStartCallback<R> {\n  assertFunction(fn, context);\n  return (controller: ReadableStreamController<R>) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertReadableStreamType(type: string, context: string): 'bytes' {\n  type = `${type}`;\n  if (type !== 'bytes') {\n    throw new TypeError(`${context} '${type}' is not a valid enumeration value for ReadableStreamType`);\n  }\n  return type;\n}\n","import { assertDictionary } from './basic';\nimport { ReadableStreamGetReaderOptions } from '../readable-stream/reader-options';\n\nexport function convertReaderOptions(options: ReadableStreamGetReaderOptions | null | undefined,\n                                     context: string): ReadableStreamGetReaderOptions {\n  assertDictionary(options, context);\n  const mode = options?.mode;\n  return {\n    mode: mode === undefined ? undefined : convertReadableStreamReaderMode(mode, `${context} has member 'mode' that`)\n  };\n}\n\nfunction convertReadableStreamReaderMode(mode: string, context: string): 'byob' {\n  mode = `${mode}`;\n  if (mode !== 'byob') {\n    throw new TypeError(`${context} '${mode}' is not a valid enumeration value for ReadableStreamReaderMode`);\n  }\n  return mode;\n}\n","import { assertDictionary } from './basic';\nimport {\n  ReadableStreamIteratorOptions,\n  ValidatedReadableStreamIteratorOptions\n} from '../readable-stream/iterator-options';\n\nexport function convertIteratorOptions(options: ReadableStreamIteratorOptions | null | undefined,\n                                       context: string): ValidatedReadableStreamIteratorOptions {\n  assertDictionary(options, context);\n  const preventCancel = options?.preventCancel;\n  return { preventCancel: Boolean(preventCancel) };\n}\n","import { assertDictionary } from './basic';\nimport { StreamPipeOptions, ValidatedStreamPipeOptions } from '../readable-stream/pipe-options';\nimport { AbortSignal, isAbortSignal } from '../abort-signal';\n\nexport function convertPipeOptions(options: StreamPipeOptions | null | undefined,\n                                   context: string): ValidatedStreamPipeOptions {\n  assertDictionary(options, context);\n  const preventAbort = options?.preventAbort;\n  const preventCancel = options?.preventCancel;\n  const preventClose = options?.preventClose;\n  const signal = options?.signal;\n  if (signal !== undefined) {\n    assertAbortSignal(signal, `${context} has member 'signal' that`);\n  }\n  return {\n    preventAbort: Boolean(preventAbort),\n    preventCancel: Boolean(preventCancel),\n    preventClose: Boolean(preventClose),\n    signal\n  };\n}\n\nfunction assertAbortSignal(signal: unknown, context: string): asserts signal is AbortSignal {\n  if (!isAbortSignal(signal)) {\n    throw new TypeError(`${context} is not an AbortSignal.`);\n  }\n}\n","import { assertDictionary, assertRequiredField } from './basic';\nimport { ReadableStream } from '../readable-stream';\nimport { WritableStream } from '../writable-stream';\nimport { assertReadableStream } from './readable-stream';\nimport { assertWritableStream } from './writable-stream';\n\nexport function convertReadableWritablePair<RS extends ReadableStream, WS extends WritableStream>(\n  pair: { readable: RS; writable: WS } | null | undefined,\n  context: string\n): { readable: RS; writable: WS } {\n  assertDictionary(pair, context);\n\n  const readable = pair?.readable;\n  assertRequiredField(readable, 'readable', 'ReadableWritablePair');\n  assertReadableStream(readable, `${context} has member 'readable' that`);\n\n  const writable = pair?.writable;\n  assertRequiredField(writable, 'writable', 'ReadableWritablePair');\n  assertWritableStream(writable, `${context} has member 'writable' that`);\n\n  return { readable, writable };\n}\n","import assert from '../stub/assert';\nimport {\n  promiseRejectedWith,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  transformPromiseWith\n} from './helpers/webidl';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { AcquireReadableStreamAsyncIterator, ReadableStreamAsyncIterator } from './readable-stream/async-iterator';\nimport { defaultReaderClosedPromiseReject, defaultReaderClosedPromiseResolve } from './readable-stream/generic-reader';\nimport {\n  AcquireReadableStreamDefaultReader,\n  IsReadableStreamDefaultReader,\n  ReadableStreamDefaultReader,\n  ReadableStreamDefaultReadResult\n} from './readable-stream/default-reader';\nimport {\n  AcquireReadableStreamBYOBReader,\n  IsReadableStreamBYOBReader,\n  ReadableStreamBYOBReader,\n  ReadableStreamBYOBReadResult\n} from './readable-stream/byob-reader';\nimport { ReadableStreamPipeTo } from './readable-stream/pipe';\nimport { ReadableStreamTee } from './readable-stream/tee';\nimport { IsWritableStream, IsWritableStreamLocked, WritableStream } from './writable-stream';\nimport { SimpleQueue } from './simple-queue';\nimport {\n  ReadableByteStreamController,\n  ReadableStreamBYOBRequest,\n  SetUpReadableByteStreamController,\n  SetUpReadableByteStreamControllerFromUnderlyingSource\n} from './readable-stream/byte-stream-controller';\nimport {\n  ReadableStreamDefaultController,\n  SetUpReadableStreamDefaultController,\n  SetUpReadableStreamDefaultControllerFromUnderlyingSource\n} from './readable-stream/default-controller';\nimport {\n  UnderlyingByteSource,\n  UnderlyingByteSourcePullCallback,\n  UnderlyingByteSourceStartCallback,\n  UnderlyingSource,\n  UnderlyingSourceCancelCallback,\n  UnderlyingSourcePullCallback,\n  UnderlyingSourceStartCallback\n} from './readable-stream/underlying-source';\nimport { noop } from '../utils';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { CreateArrayFromList } from './abstract-ops/ecmascript';\nimport { CancelSteps } from './abstract-ops/internal-methods';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { assertObject, assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport { convertUnderlyingDefaultOrByteSource } from './validators/underlying-source';\nimport { ReadableStreamGetReaderOptions } from './readable-stream/reader-options';\nimport { convertReaderOptions } from './validators/reader-options';\nimport { StreamPipeOptions, ValidatedStreamPipeOptions } from './readable-stream/pipe-options';\nimport { ReadableStreamIteratorOptions } from './readable-stream/iterator-options';\nimport { convertIteratorOptions } from './validators/iterator-options';\nimport { convertPipeOptions } from './validators/pipe-options';\nimport { ReadableWritablePair } from './readable-stream/readable-writable-pair';\nimport { convertReadableWritablePair } from './validators/readable-writable-pair';\n\nexport type ReadableByteStream = ReadableStream<Uint8Array> & {\n  _readableStreamController: ReadableByteStreamController\n};\n\ntype ReadableStreamState = 'readable' | 'closed' | 'errored';\n\n/**\n * A readable stream represents a source of data, from which you can read.\n *\n * @public\n */\nexport class ReadableStream<R = any> {\n  /** @internal */\n  _state!: ReadableStreamState;\n  /** @internal */\n  _reader: ReadableStreamReader<R> | undefined;\n  /** @internal */\n  _storedError: any;\n  /** @internal */\n  _disturbed!: boolean;\n  /** @internal */\n  _readableStreamController!: ReadableStreamDefaultController<R> | ReadableByteStreamController;\n\n  constructor(underlyingSource: UnderlyingByteSource, strategy?: { highWaterMark?: number; size?: undefined });\n  constructor(underlyingSource?: UnderlyingSource<R>, strategy?: QueuingStrategy<R>);\n  constructor(rawUnderlyingSource: UnderlyingSource<R> | UnderlyingByteSource | null | undefined = {},\n              rawStrategy: QueuingStrategy<R> | null | undefined = {}) {\n    if (rawUnderlyingSource === undefined) {\n      rawUnderlyingSource = null;\n    } else {\n      assertObject(rawUnderlyingSource, 'First parameter');\n    }\n\n    const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');\n    const underlyingSource = convertUnderlyingDefaultOrByteSource(rawUnderlyingSource, 'First parameter');\n\n    InitializeReadableStream(this);\n\n    if (underlyingSource.type === 'bytes') {\n      if (strategy.size !== undefined) {\n        throw new RangeError('The strategy for a byte stream cannot have a size function');\n      }\n      const highWaterMark = ExtractHighWaterMark(strategy, 0);\n      SetUpReadableByteStreamControllerFromUnderlyingSource(\n        this as unknown as ReadableByteStream,\n        underlyingSource,\n        highWaterMark\n      );\n    } else {\n      assert(underlyingSource.type === undefined);\n      const sizeAlgorithm = ExtractSizeAlgorithm(strategy);\n      const highWaterMark = ExtractHighWaterMark(strategy, 1);\n      SetUpReadableStreamDefaultControllerFromUnderlyingSource(\n        this,\n        underlyingSource,\n        highWaterMark,\n        sizeAlgorithm\n      );\n    }\n  }\n\n  /**\n   * Whether or not the readable stream is locked to a {@link ReadableStreamDefaultReader | reader}.\n   */\n  get locked(): boolean {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('locked');\n    }\n\n    return IsReadableStreamLocked(this);\n  }\n\n  /**\n   * Cancels the stream, signaling a loss of interest in the stream by a consumer.\n   *\n   * The supplied `reason` argument will be given to the underlying source's {@link UnderlyingSource.cancel | cancel()}\n   * method, which might or might not use it.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('cancel'));\n    }\n\n    if (IsReadableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot cancel a stream that already has a reader'));\n    }\n\n    return ReadableStreamCancel(this, reason);\n  }\n\n  /**\n   * Creates a {@link ReadableStreamBYOBReader} and locks the stream to the new reader.\n   *\n   * This call behaves the same way as the no-argument variant, except that it only works on readable byte streams,\n   * i.e. streams which were constructed specifically with the ability to handle \"bring your own buffer\" reading.\n   * The returned BYOB reader provides the ability to directly read individual chunks from the stream via its\n   * {@link ReadableStreamBYOBReader.read | read()} method, into developer-supplied buffers, allowing more precise\n   * control over allocation.\n   */\n  getReader({ mode }: { mode: 'byob' }): ReadableStreamBYOBReader;\n  /**\n   * Creates a {@link ReadableStreamDefaultReader} and locks the stream to the new reader.\n   * While the stream is locked, no other reader can be acquired until this one is released.\n   *\n   * This functionality is especially useful for creating abstractions that desire the ability to consume a stream\n   * in its entirety. By getting a reader for the stream, you can ensure nobody else can interleave reads with yours\n   * or cancel the stream, which would interfere with your abstraction.\n   */\n  getReader(): ReadableStreamDefaultReader<R>;\n  getReader(\n    rawOptions: ReadableStreamGetReaderOptions | null | undefined = undefined\n  ): ReadableStreamDefaultReader<R> | ReadableStreamBYOBReader {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('getReader');\n    }\n\n    const options = convertReaderOptions(rawOptions, 'First parameter');\n\n    if (options.mode === undefined) {\n      return AcquireReadableStreamDefaultReader(this);\n    }\n\n    assert(options.mode === 'byob');\n    return AcquireReadableStreamBYOBReader(this as unknown as ReadableByteStream);\n  }\n\n  /**\n   * Provides a convenient, chainable way of piping this readable stream through a transform stream\n   * (or any other `{ writable, readable }` pair). It simply {@link ReadableStream.pipeTo | pipes} the stream\n   * into the writable side of the supplied pair, and returns the readable side for further use.\n   *\n   * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.\n   */\n  pipeThrough<RS extends ReadableStream>(\n    transform: { readable: RS; writable: WritableStream<R> },\n    options?: StreamPipeOptions\n  ): RS;\n  pipeThrough<RS extends ReadableStream>(\n    rawTransform: { readable: RS; writable: WritableStream<R> } | null | undefined,\n    rawOptions: StreamPipeOptions | null | undefined = {}\n  ): RS {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('pipeThrough');\n    }\n    assertRequiredArgument(rawTransform, 1, 'pipeThrough');\n\n    const transform = convertReadableWritablePair(rawTransform, 'First parameter');\n    const options = convertPipeOptions(rawOptions, 'Second parameter');\n\n    if (IsReadableStreamLocked(this)) {\n      throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked ReadableStream');\n    }\n    if (IsWritableStreamLocked(transform.writable)) {\n      throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked WritableStream');\n    }\n\n    const promise = ReadableStreamPipeTo(\n      this, transform.writable, options.preventClose, options.preventAbort, options.preventCancel, options.signal\n    );\n\n    setPromiseIsHandledToTrue(promise);\n\n    return transform.readable;\n  }\n\n  /**\n   * Pipes this readable stream to a given writable stream. The way in which the piping process behaves under\n   * various error conditions can be customized with a number of passed options. It returns a promise that fulfills\n   * when the piping process completes successfully, or rejects if any errors were encountered.\n   *\n   * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.\n   */\n  pipeTo(destination: WritableStream<R>, options?: StreamPipeOptions): Promise<void>;\n  pipeTo(destination: WritableStream<R> | null | undefined,\n         rawOptions: StreamPipeOptions | null | undefined = {}): Promise<void> {\n    if (!IsReadableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('pipeTo'));\n    }\n\n    if (destination === undefined) {\n      return promiseRejectedWith(`Parameter 1 is required in 'pipeTo'.`);\n    }\n    if (!IsWritableStream(destination)) {\n      return promiseRejectedWith(\n        new TypeError(`ReadableStream.prototype.pipeTo's first argument must be a WritableStream`)\n      );\n    }\n\n    let options: ValidatedStreamPipeOptions;\n    try {\n      options = convertPipeOptions(rawOptions, 'Second parameter');\n    } catch (e) {\n      return promiseRejectedWith(e);\n    }\n\n    if (IsReadableStreamLocked(this)) {\n      return promiseRejectedWith(\n        new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream')\n      );\n    }\n    if (IsWritableStreamLocked(destination)) {\n      return promiseRejectedWith(\n        new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream')\n      );\n    }\n\n    return ReadableStreamPipeTo<R>(\n      this, destination, options.preventClose, options.preventAbort, options.preventCancel, options.signal\n    );\n  }\n\n  /**\n   * Tees this readable stream, returning a two-element array containing the two resulting branches as\n   * new {@link ReadableStream} instances.\n   *\n   * Teeing a stream will lock it, preventing any other consumer from acquiring a reader.\n   * To cancel the stream, cancel both of the resulting branches; a composite cancellation reason will then be\n   * propagated to the stream's underlying source.\n   *\n   * Note that the chunks seen in each branch will be the same object. If the chunks are not immutable,\n   * this could allow interference between the two branches.\n   */\n  tee(): [ReadableStream<R>, ReadableStream<R>] {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('tee');\n    }\n\n    const branches = ReadableStreamTee(this, false);\n    return CreateArrayFromList(branches);\n  }\n\n  /**\n   * Asynchronously iterates over the chunks in the stream's internal queue.\n   *\n   * Asynchronously iterating over the stream will lock it, preventing any other consumer from acquiring a reader.\n   * The lock will be released if the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method\n   * is called, e.g. by breaking out of the loop.\n   *\n   * By default, calling the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method will also\n   * cancel the stream. To prevent this, use the stream's {@link ReadableStream.values | values()} method, passing\n   * `true` for the `preventCancel` option.\n   */\n  values(options?: ReadableStreamIteratorOptions): ReadableStreamAsyncIterator<R>;\n  values(rawOptions: ReadableStreamIteratorOptions | null | undefined = undefined): ReadableStreamAsyncIterator<R> {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('values');\n    }\n\n    const options = convertIteratorOptions(rawOptions, 'First parameter');\n    return AcquireReadableStreamAsyncIterator<R>(this, options.preventCancel);\n  }\n\n  /**\n   * {@inheritDoc ReadableStream.values}\n   */\n  [Symbol.asyncIterator]: (options?: ReadableStreamIteratorOptions) => ReadableStreamAsyncIterator<R>;\n}\n\nObject.defineProperties(ReadableStream.prototype, {\n  cancel: { enumerable: true },\n  getReader: { enumerable: true },\n  pipeThrough: { enumerable: true },\n  pipeTo: { enumerable: true },\n  tee: { enumerable: true },\n  values: { enumerable: true },\n  locked: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStream.prototype, Symbol.toStringTag, {\n    value: 'ReadableStream',\n    configurable: true\n  });\n}\nif (typeof Symbol.asyncIterator === 'symbol') {\n  Object.defineProperty(ReadableStream.prototype, Symbol.asyncIterator, {\n    value: ReadableStream.prototype.values,\n    writable: true,\n    configurable: true\n  });\n}\n\nexport {\n  ReadableStreamAsyncIterator,\n  ReadableStreamDefaultReadResult,\n  ReadableStreamBYOBReadResult,\n  UnderlyingByteSource,\n  UnderlyingSource,\n  UnderlyingSourceStartCallback,\n  UnderlyingSourcePullCallback,\n  UnderlyingSourceCancelCallback,\n  UnderlyingByteSourceStartCallback,\n  UnderlyingByteSourcePullCallback,\n  StreamPipeOptions,\n  ReadableWritablePair,\n  ReadableStreamIteratorOptions\n};\n\n// Abstract operations for the ReadableStream.\n\n// Throws if and only if startAlgorithm throws.\nexport function CreateReadableStream<R>(startAlgorithm: () => void | PromiseLike<void>,\n                                        pullAlgorithm: () => Promise<void>,\n                                        cancelAlgorithm: (reason: any) => Promise<void>,\n                                        highWaterMark = 1,\n                                        sizeAlgorithm: QueuingStrategySizeCallback<R> = () => 1): ReadableStream<R> {\n  assert(IsNonNegativeNumber(highWaterMark));\n\n  const stream: ReadableStream<R> = Object.create(ReadableStream.prototype);\n  InitializeReadableStream(stream);\n\n  const controller: ReadableStreamDefaultController<R> = Object.create(ReadableStreamDefaultController.prototype);\n  SetUpReadableStreamDefaultController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm\n  );\n\n  return stream;\n}\n\n// Throws if and only if startAlgorithm throws.\nexport function CreateReadableByteStream(\n  startAlgorithm: () => void | PromiseLike<void>,\n  pullAlgorithm: () => Promise<void>,\n  cancelAlgorithm: (reason: any) => Promise<void>\n): ReadableByteStream {\n  const stream: ReadableByteStream = Object.create(ReadableStream.prototype);\n  InitializeReadableStream(stream);\n\n  const controller: ReadableByteStreamController = Object.create(ReadableByteStreamController.prototype);\n  SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, 0, undefined);\n\n  return stream;\n}\n\nfunction InitializeReadableStream(stream: ReadableStream) {\n  stream._state = 'readable';\n  stream._reader = undefined;\n  stream._storedError = undefined;\n  stream._disturbed = false;\n}\n\nexport function IsReadableStream(x: unknown): x is ReadableStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readableStreamController')) {\n    return false;\n  }\n\n  return x instanceof ReadableStream;\n}\n\nexport function IsReadableStreamDisturbed(stream: ReadableStream): boolean {\n  assert(IsReadableStream(stream));\n\n  return stream._disturbed;\n}\n\nexport function IsReadableStreamLocked(stream: ReadableStream): boolean {\n  assert(IsReadableStream(stream));\n\n  if (stream._reader === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamCancel<R>(stream: ReadableStream<R>, reason: any): Promise<undefined> {\n  stream._disturbed = true;\n\n  if (stream._state === 'closed') {\n    return promiseResolvedWith(undefined);\n  }\n  if (stream._state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  ReadableStreamClose(stream);\n\n  const reader = stream._reader;\n  if (reader !== undefined && IsReadableStreamBYOBReader(reader)) {\n    reader._readIntoRequests.forEach(readIntoRequest => {\n      readIntoRequest._closeSteps(undefined);\n    });\n    reader._readIntoRequests = new SimpleQueue();\n  }\n\n  const sourceCancelPromise = stream._readableStreamController[CancelSteps](reason);\n  return transformPromiseWith(sourceCancelPromise, noop);\n}\n\nexport function ReadableStreamClose<R>(stream: ReadableStream<R>): void {\n  assert(stream._state === 'readable');\n\n  stream._state = 'closed';\n\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return;\n  }\n\n  defaultReaderClosedPromiseResolve(reader);\n\n  if (IsReadableStreamDefaultReader<R>(reader)) {\n    reader._readRequests.forEach(readRequest => {\n      readRequest._closeSteps();\n    });\n    reader._readRequests = new SimpleQueue();\n  }\n}\n\nexport function ReadableStreamError<R>(stream: ReadableStream<R>, e: any): void {\n  assert(IsReadableStream(stream));\n  assert(stream._state === 'readable');\n\n  stream._state = 'errored';\n  stream._storedError = e;\n\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return;\n  }\n\n  defaultReaderClosedPromiseReject(reader, e);\n\n  if (IsReadableStreamDefaultReader<R>(reader)) {\n    reader._readRequests.forEach(readRequest => {\n      readRequest._errorSteps(e);\n    });\n\n    reader._readRequests = new SimpleQueue();\n  } else {\n    assert(IsReadableStreamBYOBReader(reader));\n\n    reader._readIntoRequests.forEach(readIntoRequest => {\n      readIntoRequest._errorSteps(e);\n    });\n\n    reader._readIntoRequests = new SimpleQueue();\n  }\n}\n\n// Readers\n\nexport type ReadableStreamReader<R> = ReadableStreamDefaultReader<R> | ReadableStreamBYOBReader;\n\nexport {\n  ReadableStreamDefaultReader,\n  ReadableStreamBYOBReader\n};\n\n// Controllers\n\nexport {\n  ReadableStreamDefaultController,\n  ReadableStreamBYOBRequest,\n  ReadableByteStreamController\n};\n\n// Helper functions for the ReadableStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(`ReadableStream.prototype.${name} can only be used on a ReadableStream`);\n}\n","import { QueuingStrategyInit } from '../queuing-strategy';\nimport { assertDictionary, assertRequiredField, convertUnrestrictedDouble } from './basic';\n\nexport function convertQueuingStrategyInit(init: QueuingStrategyInit | null | undefined,\n                                           context: string): QueuingStrategyInit {\n  assertDictionary(init, context);\n  const highWaterMark = init?.highWaterMark;\n  assertRequiredField(highWaterMark, 'highWaterMark', 'QueuingStrategyInit');\n  return {\n    highWaterMark: convertUnrestrictedDouble(highWaterMark)\n  };\n}\n","import { QueuingStrategy, QueuingStrategyInit } from './queuing-strategy';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategyInit } from './validators/queuing-strategy-init';\n\n// The size function must not have a prototype property nor be a constructor\nconst byteLengthSizeFunction = (chunk: ArrayBufferView): number => {\n  return chunk.byteLength;\n};\ntry {\n  Object.defineProperty(byteLengthSizeFunction, 'name', {\n    value: 'size',\n    configurable: true\n  });\n} catch {\n  // This property is non-configurable in older browsers, so ignore if this throws.\n  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility\n}\n\n/**\n * A queuing strategy that counts the number of bytes in each chunk.\n *\n * @public\n */\nexport default class ByteLengthQueuingStrategy implements QueuingStrategy<ArrayBufferView> {\n  /** @internal */\n  readonly _byteLengthQueuingStrategyHighWaterMark: number;\n\n  constructor(options: QueuingStrategyInit) {\n    assertRequiredArgument(options, 1, 'ByteLengthQueuingStrategy');\n    options = convertQueuingStrategyInit(options, 'First parameter');\n    this._byteLengthQueuingStrategyHighWaterMark = options.highWaterMark;\n  }\n\n  /**\n   * Returns the high water mark provided to the constructor.\n   */\n  get highWaterMark(): number {\n    if (!IsByteLengthQueuingStrategy(this)) {\n      throw byteLengthBrandCheckException('highWaterMark');\n    }\n    return this._byteLengthQueuingStrategyHighWaterMark;\n  }\n\n  /**\n   * Measures the size of `chunk` by returning the value of its `byteLength` property.\n   */\n  get size(): (chunk: ArrayBufferView) => number {\n    if (!IsByteLengthQueuingStrategy(this)) {\n      throw byteLengthBrandCheckException('size');\n    }\n    return byteLengthSizeFunction;\n  }\n}\n\nObject.defineProperties(ByteLengthQueuingStrategy.prototype, {\n  highWaterMark: { enumerable: true },\n  size: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ByteLengthQueuingStrategy.prototype, Symbol.toStringTag, {\n    value: 'ByteLengthQueuingStrategy',\n    configurable: true\n  });\n}\n\n// Helper functions for the ByteLengthQueuingStrategy.\n\nfunction byteLengthBrandCheckException(name: string): TypeError {\n  return new TypeError(`ByteLengthQueuingStrategy.prototype.${name} can only be used on a ByteLengthQueuingStrategy`);\n}\n\nexport function IsByteLengthQueuingStrategy(x: any): x is ByteLengthQueuingStrategy {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_byteLengthQueuingStrategyHighWaterMark')) {\n    return false;\n  }\n\n  return x instanceof ByteLengthQueuingStrategy;\n}\n","import { QueuingStrategy, QueuingStrategyInit } from './queuing-strategy';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategyInit } from './validators/queuing-strategy-init';\n\n// The size function must not have a prototype property nor be a constructor\nconst countSizeFunction = (): 1 => {\n  return 1;\n};\ntry {\n  Object.defineProperty(countSizeFunction, 'name', {\n    value: 'size',\n    configurable: true\n  });\n} catch {\n  // This property is non-configurable in older browsers, so ignore if this throws.\n  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility\n}\n\n/**\n * A queuing strategy that counts the number of chunks.\n *\n * @public\n */\nexport default class CountQueuingStrategy implements QueuingStrategy<any> {\n  /** @internal */\n  readonly _countQueuingStrategyHighWaterMark!: number;\n\n  constructor(options: QueuingStrategyInit) {\n    assertRequiredArgument(options, 1, 'CountQueuingStrategy');\n    options = convertQueuingStrategyInit(options, 'First parameter');\n    this._countQueuingStrategyHighWaterMark = options.highWaterMark;\n  }\n\n  /**\n   * Returns the high water mark provided to the constructor.\n   */\n  get highWaterMark(): number {\n    if (!IsCountQueuingStrategy(this)) {\n      throw countBrandCheckException('highWaterMark');\n    }\n    return this._countQueuingStrategyHighWaterMark;\n  }\n\n  /**\n   * Measures the size of `chunk` by always returning 1.\n   * This ensures that the total queue size is a count of the number of chunks in the queue.\n   */\n  get size(): (chunk: any) => 1 {\n    if (!IsCountQueuingStrategy(this)) {\n      throw countBrandCheckException('size');\n    }\n    return countSizeFunction;\n  }\n}\n\nObject.defineProperties(CountQueuingStrategy.prototype, {\n  highWaterMark: { enumerable: true },\n  size: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(CountQueuingStrategy.prototype, Symbol.toStringTag, {\n    value: 'CountQueuingStrategy',\n    configurable: true\n  });\n}\n\n// Helper functions for the CountQueuingStrategy.\n\nfunction countBrandCheckException(name: string): TypeError {\n  return new TypeError(`CountQueuingStrategy.prototype.${name} can only be used on a CountQueuingStrategy`);\n}\n\nexport function IsCountQueuingStrategy(x: any): x is CountQueuingStrategy {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_countQueuingStrategyHighWaterMark')) {\n    return false;\n  }\n\n  return x instanceof CountQueuingStrategy;\n}\n","import { assertDictionary, assertFunction } from './basic';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\nimport {\n  Transformer,\n  TransformerFlushCallback,\n  TransformerStartCallback,\n  TransformerTransformCallback,\n  ValidatedTransformer\n} from '../transform-stream/transformer';\nimport { TransformStreamDefaultController } from '../transform-stream';\n\nexport function convertTransformer<I, O>(original: Transformer<I, O> | null,\n                                         context: string): ValidatedTransformer<I, O> {\n  assertDictionary(original, context);\n  const flush = original?.flush;\n  const readableType = original?.readableType;\n  const start = original?.start;\n  const transform = original?.transform;\n  const writableType = original?.writableType;\n  return {\n    flush: flush === undefined ?\n      undefined :\n      convertTransformerFlushCallback(flush, original!, `${context} has member 'flush' that`),\n    readableType,\n    start: start === undefined ?\n      undefined :\n      convertTransformerStartCallback(start, original!, `${context} has member 'start' that`),\n    transform: transform === undefined ?\n      undefined :\n      convertTransformerTransformCallback(transform, original!, `${context} has member 'transform' that`),\n    writableType\n  };\n}\n\nfunction convertTransformerFlushCallback<I, O>(\n  fn: TransformerFlushCallback<O>,\n  original: Transformer<I, O>,\n  context: string\n): (controller: TransformStreamDefaultController<O>) => Promise<void> {\n  assertFunction(fn, context);\n  return (controller: TransformStreamDefaultController<O>) => promiseCall(fn, original, [controller]);\n}\n\nfunction convertTransformerStartCallback<I, O>(\n  fn: TransformerStartCallback<O>,\n  original: Transformer<I, O>,\n  context: string\n): TransformerStartCallback<O> {\n  assertFunction(fn, context);\n  return (controller: TransformStreamDefaultController<O>) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertTransformerTransformCallback<I, O>(\n  fn: TransformerTransformCallback<I, O>,\n  original: Transformer<I, O>,\n  context: string\n): (chunk: I, controller: TransformStreamDefaultController<O>) => Promise<void> {\n  assertFunction(fn, context);\n  return (chunk: I, controller: TransformStreamDefaultController<O>) => promiseCall(fn, original, [chunk, controller]);\n}\n","import assert from '../stub/assert';\nimport { newPromise, promiseRejectedWith, promiseResolvedWith, transformPromiseWith } from './helpers/webidl';\nimport { CreateReadableStream, ReadableStream, ReadableStreamDefaultController } from './readable-stream';\nimport {\n  ReadableStreamDefaultControllerCanCloseOrEnqueue,\n  ReadableStreamDefaultControllerClose,\n  ReadableStreamDefaultControllerEnqueue,\n  ReadableStreamDefaultControllerError,\n  ReadableStreamDefaultControllerGetDesiredSize,\n  ReadableStreamDefaultControllerHasBackpressure\n} from './readable-stream/default-controller';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { CreateWritableStream, WritableStream, WritableStreamDefaultControllerErrorIfNeeded } from './writable-stream';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport {\n  Transformer,\n  TransformerFlushCallback,\n  TransformerStartCallback,\n  TransformerTransformCallback,\n  ValidatedTransformer\n} from './transform-stream/transformer';\nimport { convertTransformer } from './validators/transformer';\n\n// Class TransformStream\n\n/**\n * A transform stream consists of a pair of streams: a {@link WritableStream | writable stream},\n * known as its writable side, and a {@link ReadableStream | readable stream}, known as its readable side.\n * In a manner specific to the transform stream in question, writes to the writable side result in new data being\n * made available for reading from the readable side.\n *\n * @public\n */\nexport class TransformStream<I = any, O = any> {\n  /** @internal */\n  _writable!: WritableStream<I>;\n  /** @internal */\n  _readable!: ReadableStream<O>;\n  /** @internal */\n  _backpressure!: boolean;\n  /** @internal */\n  _backpressureChangePromise!: Promise<void>;\n  /** @internal */\n  _backpressureChangePromise_resolve!: () => void;\n  /** @internal */\n  _transformStreamController!: TransformStreamDefaultController<O>;\n\n  constructor(\n    transformer?: Transformer<I, O>,\n    writableStrategy?: QueuingStrategy<I>,\n    readableStrategy?: QueuingStrategy<O>\n  );\n  constructor(rawTransformer: Transformer<I, O> | null | undefined = {},\n              rawWritableStrategy: QueuingStrategy<I> | null | undefined = {},\n              rawReadableStrategy: QueuingStrategy<O> | null | undefined = {}) {\n    if (rawTransformer === undefined) {\n      rawTransformer = null;\n    }\n\n    const writableStrategy = convertQueuingStrategy(rawWritableStrategy, 'Second parameter');\n    const readableStrategy = convertQueuingStrategy(rawReadableStrategy, 'Third parameter');\n\n    const transformer = convertTransformer(rawTransformer, 'First parameter');\n    if (transformer.readableType !== undefined) {\n      throw new RangeError('Invalid readableType specified');\n    }\n    if (transformer.writableType !== undefined) {\n      throw new RangeError('Invalid writableType specified');\n    }\n\n    const readableHighWaterMark = ExtractHighWaterMark(readableStrategy, 0);\n    const readableSizeAlgorithm = ExtractSizeAlgorithm(readableStrategy);\n    const writableHighWaterMark = ExtractHighWaterMark(writableStrategy, 1);\n    const writableSizeAlgorithm = ExtractSizeAlgorithm(writableStrategy);\n\n    let startPromise_resolve!: (value: void | PromiseLike<void>) => void;\n    const startPromise = newPromise<void>(resolve => {\n      startPromise_resolve = resolve;\n    });\n\n    InitializeTransformStream(\n      this, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm\n    );\n    SetUpTransformStreamDefaultControllerFromTransformer(this, transformer);\n\n    if (transformer.start !== undefined) {\n      startPromise_resolve(transformer.start(this._transformStreamController));\n    } else {\n      startPromise_resolve(undefined);\n    }\n  }\n\n  /**\n   * The readable side of the transform stream.\n   */\n  get readable(): ReadableStream<O> {\n    if (!IsTransformStream(this)) {\n      throw streamBrandCheckException('readable');\n    }\n\n    return this._readable;\n  }\n\n  /**\n   * The writable side of the transform stream.\n   */\n  get writable(): WritableStream<I> {\n    if (!IsTransformStream(this)) {\n      throw streamBrandCheckException('writable');\n    }\n\n    return this._writable;\n  }\n}\n\nObject.defineProperties(TransformStream.prototype, {\n  readable: { enumerable: true },\n  writable: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(TransformStream.prototype, Symbol.toStringTag, {\n    value: 'TransformStream',\n    configurable: true\n  });\n}\n\nexport {\n  Transformer,\n  TransformerStartCallback,\n  TransformerFlushCallback,\n  TransformerTransformCallback\n};\n\n// Transform Stream Abstract Operations\n\nexport function CreateTransformStream<I, O>(startAlgorithm: () => void | PromiseLike<void>,\n                                            transformAlgorithm: (chunk: I) => Promise<void>,\n                                            flushAlgorithm: () => Promise<void>,\n                                            writableHighWaterMark = 1,\n                                            writableSizeAlgorithm: QueuingStrategySizeCallback<I> = () => 1,\n                                            readableHighWaterMark = 0,\n                                            readableSizeAlgorithm: QueuingStrategySizeCallback<O> = () => 1) {\n  assert(IsNonNegativeNumber(writableHighWaterMark));\n  assert(IsNonNegativeNumber(readableHighWaterMark));\n\n  const stream: TransformStream<I, O> = Object.create(TransformStream.prototype);\n\n  let startPromise_resolve!: (value: void | PromiseLike<void>) => void;\n  const startPromise = newPromise<void>(resolve => {\n    startPromise_resolve = resolve;\n  });\n\n  InitializeTransformStream(stream, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark,\n                            readableSizeAlgorithm);\n\n  const controller: TransformStreamDefaultController<O> = Object.create(TransformStreamDefaultController.prototype);\n\n  SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);\n\n  const startResult = startAlgorithm();\n  startPromise_resolve(startResult);\n  return stream;\n}\n\nfunction InitializeTransformStream<I, O>(stream: TransformStream<I, O>,\n                                         startPromise: Promise<void>,\n                                         writableHighWaterMark: number,\n                                         writableSizeAlgorithm: QueuingStrategySizeCallback<I>,\n                                         readableHighWaterMark: number,\n                                         readableSizeAlgorithm: QueuingStrategySizeCallback<O>) {\n  function startAlgorithm(): Promise<void> {\n    return startPromise;\n  }\n\n  function writeAlgorithm(chunk: I): Promise<void> {\n    return TransformStreamDefaultSinkWriteAlgorithm(stream, chunk);\n  }\n\n  function abortAlgorithm(reason: any): Promise<void> {\n    return TransformStreamDefaultSinkAbortAlgorithm(stream, reason);\n  }\n\n  function closeAlgorithm(): Promise<void> {\n    return TransformStreamDefaultSinkCloseAlgorithm(stream);\n  }\n\n  stream._writable = CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm,\n                                          writableHighWaterMark, writableSizeAlgorithm);\n\n  function pullAlgorithm(): Promise<void> {\n    return TransformStreamDefaultSourcePullAlgorithm(stream);\n  }\n\n  function cancelAlgorithm(reason: any): Promise<void> {\n    TransformStreamErrorWritableAndUnblockWrite(stream, reason);\n    return promiseResolvedWith(undefined);\n  }\n\n  stream._readable = CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, readableHighWaterMark,\n                                          readableSizeAlgorithm);\n\n  // The [[backpressure]] slot is set to undefined so that it can be initialised by TransformStreamSetBackpressure.\n  stream._backpressure = undefined!;\n  stream._backpressureChangePromise = undefined!;\n  stream._backpressureChangePromise_resolve = undefined!;\n  TransformStreamSetBackpressure(stream, true);\n\n  stream._transformStreamController = undefined!;\n}\n\nfunction IsTransformStream(x: unknown): x is TransformStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_transformStreamController')) {\n    return false;\n  }\n\n  return x instanceof TransformStream;\n}\n\n// This is a no-op if both sides are already errored.\nfunction TransformStreamError(stream: TransformStream, e: any) {\n  ReadableStreamDefaultControllerError(\n    stream._readable._readableStreamController as ReadableStreamDefaultController<any>,\n    e\n  );\n  TransformStreamErrorWritableAndUnblockWrite(stream, e);\n}\n\nfunction TransformStreamErrorWritableAndUnblockWrite(stream: TransformStream, e: any) {\n  TransformStreamDefaultControllerClearAlgorithms(stream._transformStreamController);\n  WritableStreamDefaultControllerErrorIfNeeded(stream._writable._writableStreamController, e);\n  if (stream._backpressure) {\n    // Pretend that pull() was called to permit any pending write() calls to complete. TransformStreamSetBackpressure()\n    // cannot be called from enqueue() or pull() once the ReadableStream is errored, so this will will be the final time\n    // _backpressure is set.\n    TransformStreamSetBackpressure(stream, false);\n  }\n}\n\nfunction TransformStreamSetBackpressure(stream: TransformStream, backpressure: boolean) {\n  // Passes also when called during construction.\n  assert(stream._backpressure !== backpressure);\n\n  if (stream._backpressureChangePromise !== undefined) {\n    stream._backpressureChangePromise_resolve();\n  }\n\n  stream._backpressureChangePromise = newPromise(resolve => {\n    stream._backpressureChangePromise_resolve = resolve;\n  });\n\n  stream._backpressure = backpressure;\n}\n\n// Class TransformStreamDefaultController\n\n/**\n * Allows control of the {@link ReadableStream} and {@link WritableStream} of the associated {@link TransformStream}.\n *\n * @public\n */\nexport class TransformStreamDefaultController<O> {\n  /** @internal */\n  _controlledTransformStream: TransformStream<any, O>;\n  /** @internal */\n  _transformAlgorithm: (chunk: any) => Promise<void>;\n  /** @internal */\n  _flushAlgorithm: () => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the desired size to fill the readable side’s internal queue. It can be negative, if the queue is over-full.\n   */\n  get desiredSize(): number | null {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('desiredSize');\n    }\n\n    const readableController = this._controlledTransformStream._readable._readableStreamController;\n    return ReadableStreamDefaultControllerGetDesiredSize(readableController as ReadableStreamDefaultController<O>);\n  }\n\n  /**\n   * Enqueues the given chunk `chunk` in the readable side of the controlled transform stream.\n   */\n  enqueue(chunk: O): void;\n  enqueue(chunk: O = undefined!): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('enqueue');\n    }\n\n    TransformStreamDefaultControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors both the readable side and the writable side of the controlled transform stream, making all future\n   * interactions with it fail with the given error `e`. Any chunks queued for transformation will be discarded.\n   */\n  error(reason: any = undefined): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n\n    TransformStreamDefaultControllerError(this, reason);\n  }\n\n  /**\n   * Closes the readable side and errors the writable side of the controlled transform stream. This is useful when the\n   * transformer only needs to consume a portion of the chunks written to the writable side.\n   */\n  terminate(): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('terminate');\n    }\n\n    TransformStreamDefaultControllerTerminate(this);\n  }\n}\n\nObject.defineProperties(TransformStreamDefaultController.prototype, {\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  terminate: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(TransformStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'TransformStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Transform Stream Default Controller Abstract Operations\n\nfunction IsTransformStreamDefaultController<O = any>(x: any): x is TransformStreamDefaultController<O> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledTransformStream')) {\n    return false;\n  }\n\n  return x instanceof TransformStreamDefaultController;\n}\n\nfunction SetUpTransformStreamDefaultController<I, O>(stream: TransformStream<I, O>,\n                                                     controller: TransformStreamDefaultController<O>,\n                                                     transformAlgorithm: (chunk: I) => Promise<void>,\n                                                     flushAlgorithm: () => Promise<void>) {\n  assert(IsTransformStream(stream));\n  assert(stream._transformStreamController === undefined);\n\n  controller._controlledTransformStream = stream;\n  stream._transformStreamController = controller;\n\n  controller._transformAlgorithm = transformAlgorithm;\n  controller._flushAlgorithm = flushAlgorithm;\n}\n\nfunction SetUpTransformStreamDefaultControllerFromTransformer<I, O>(stream: TransformStream<I, O>,\n                                                                    transformer: ValidatedTransformer<I, O>) {\n  const controller: TransformStreamDefaultController<O> = Object.create(TransformStreamDefaultController.prototype);\n\n  let transformAlgorithm = (chunk: I): Promise<void> => {\n    try {\n      TransformStreamDefaultControllerEnqueue(controller, chunk as unknown as O);\n      return promiseResolvedWith(undefined);\n    } catch (transformResultE) {\n      return promiseRejectedWith(transformResultE);\n    }\n  };\n\n  let flushAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (transformer.transform !== undefined) {\n    transformAlgorithm = chunk => transformer.transform!(chunk, controller);\n  }\n  if (transformer.flush !== undefined) {\n    flushAlgorithm = () => transformer.flush!(controller);\n  }\n\n  SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);\n}\n\nfunction TransformStreamDefaultControllerClearAlgorithms(controller: TransformStreamDefaultController<any>) {\n  controller._transformAlgorithm = undefined!;\n  controller._flushAlgorithm = undefined!;\n}\n\nfunction TransformStreamDefaultControllerEnqueue<O>(controller: TransformStreamDefaultController<O>, chunk: O) {\n  const stream = controller._controlledTransformStream;\n  const readableController = stream._readable._readableStreamController as ReadableStreamDefaultController<O>;\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(readableController)) {\n    throw new TypeError('Readable side is not in a state that permits enqueue');\n  }\n\n  // We throttle transform invocations based on the backpressure of the ReadableStream, but we still\n  // accept TransformStreamDefaultControllerEnqueue() calls.\n\n  try {\n    ReadableStreamDefaultControllerEnqueue(readableController, chunk);\n  } catch (e) {\n    // This happens when readableStrategy.size() throws.\n    TransformStreamErrorWritableAndUnblockWrite(stream, e);\n\n    throw stream._readable._storedError;\n  }\n\n  const backpressure = ReadableStreamDefaultControllerHasBackpressure(readableController);\n  if (backpressure !== stream._backpressure) {\n    assert(backpressure);\n    TransformStreamSetBackpressure(stream, true);\n  }\n}\n\nfunction TransformStreamDefaultControllerError(controller: TransformStreamDefaultController<any>, e: any) {\n  TransformStreamError(controller._controlledTransformStream, e);\n}\n\nfunction TransformStreamDefaultControllerPerformTransform<I, O>(controller: TransformStreamDefaultController<O>,\n                                                                chunk: I) {\n  const transformPromise = controller._transformAlgorithm(chunk);\n  return transformPromiseWith(transformPromise, undefined, r => {\n    TransformStreamError(controller._controlledTransformStream, r);\n    throw r;\n  });\n}\n\nfunction TransformStreamDefaultControllerTerminate<O>(controller: TransformStreamDefaultController<O>) {\n  const stream = controller._controlledTransformStream;\n  const readableController = stream._readable._readableStreamController as ReadableStreamDefaultController<O>;\n\n  ReadableStreamDefaultControllerClose(readableController);\n\n  const error = new TypeError('TransformStream terminated');\n  TransformStreamErrorWritableAndUnblockWrite(stream, error);\n}\n\n// TransformStreamDefaultSink Algorithms\n\nfunction TransformStreamDefaultSinkWriteAlgorithm<I, O>(stream: TransformStream<I, O>, chunk: I): Promise<void> {\n  assert(stream._writable._state === 'writable');\n\n  const controller = stream._transformStreamController;\n\n  if (stream._backpressure) {\n    const backpressureChangePromise = stream._backpressureChangePromise;\n    assert(backpressureChangePromise !== undefined);\n    return transformPromiseWith(backpressureChangePromise, () => {\n      const writable = stream._writable;\n      const state = writable._state;\n      if (state === 'erroring') {\n        throw writable._storedError;\n      }\n      assert(state === 'writable');\n      return TransformStreamDefaultControllerPerformTransform<I, O>(controller, chunk);\n    });\n  }\n\n  return TransformStreamDefaultControllerPerformTransform<I, O>(controller, chunk);\n}\n\nfunction TransformStreamDefaultSinkAbortAlgorithm(stream: TransformStream, reason: any): Promise<void> {\n  // abort() is not called synchronously, so it is possible for abort() to be called when the stream is already\n  // errored.\n  TransformStreamError(stream, reason);\n  return promiseResolvedWith(undefined);\n}\n\nfunction TransformStreamDefaultSinkCloseAlgorithm<I, O>(stream: TransformStream<I, O>): Promise<void> {\n  // stream._readable cannot change after construction, so caching it across a call to user code is safe.\n  const readable = stream._readable;\n\n  const controller = stream._transformStreamController;\n  const flushPromise = controller._flushAlgorithm();\n  TransformStreamDefaultControllerClearAlgorithms(controller);\n\n  // Return a promise that is fulfilled with undefined on success.\n  return transformPromiseWith(flushPromise, () => {\n    if (readable._state === 'errored') {\n      throw readable._storedError;\n    }\n    ReadableStreamDefaultControllerClose(readable._readableStreamController as ReadableStreamDefaultController<O>);\n  }, r => {\n    TransformStreamError(stream, r);\n    throw readable._storedError;\n  });\n}\n\n// TransformStreamDefaultSource Algorithms\n\nfunction TransformStreamDefaultSourcePullAlgorithm(stream: TransformStream): Promise<void> {\n  // Invariant. Enforced by the promises returned by start() and pull().\n  assert(stream._backpressure);\n\n  assert(stream._backpressureChangePromise !== undefined);\n\n  TransformStreamSetBackpressure(stream, false);\n\n  // Prevent the next pull() call until there is backpressure.\n  return stream._backpressureChangePromise;\n}\n\n// Helper functions for the TransformStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `TransformStreamDefaultController.prototype.${name} can only be used on a TransformStreamDefaultController`);\n}\n\n// Helper functions for the TransformStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `TransformStream.prototype.${name} can only be used on a TransformStream`);\n}\n","import {\n  ByteLengthQueuingStrategy,\n  CountQueuingStrategy,\n  ReadableByteStreamController,\n  ReadableStream,\n  ReadableStreamBYOBReader,\n  ReadableStreamBYOBRequest,\n  ReadableStreamDefaultController,\n  ReadableStreamDefaultReader,\n  TransformStream,\n  TransformStreamDefaultController,\n  WritableStream,\n  WritableStreamDefaultController,\n  WritableStreamDefaultWriter\n} from './ponyfill';\nimport { globals } from './utils';\n\n// Export\nexport * from './ponyfill';\n\nconst exports = {\n  ReadableStream,\n  ReadableStreamDefaultController,\n  ReadableByteStreamController,\n  ReadableStreamBYOBRequest,\n  ReadableStreamDefaultReader,\n  ReadableStreamBYOBReader,\n\n  WritableStream,\n  WritableStreamDefaultController,\n  WritableStreamDefaultWriter,\n\n  ByteLengthQueuingStrategy,\n  CountQueuingStrategy,\n\n  TransformStream,\n  TransformStreamDefaultController\n};\n\n// Add classes to global scope\nif (typeof globals !== 'undefined') {\n  for (const prop in exports) {\n    if (Object.prototype.hasOwnProperty.call(exports, prop)) {\n      Object.defineProperty(globals, prop, {\n        value: exports[prop as (keyof 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\ No newline at end of file
diff --git a/node_modules/web-streams-polyfill/dist/polyfill.es6.js b/node_modules/web-streams-polyfill/dist/polyfill.es6.js
new file mode 100644
index 0000000..18a4721
--- /dev/null
+++ b/node_modules/web-streams-polyfill/dist/polyfill.es6.js
@@ -0,0 +1,4252 @@
+/**
+ * web-streams-polyfill v3.2.1
+ */
+(function (global, factory) {
+    typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
+    typeof define === 'function' && define.amd ? define(['exports'], factory) :
+    (global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.WebStreamsPolyfill = {}));
+}(this, (function (exports) { 'use strict';
+
+    /// <reference lib="es2015.symbol" />
+    const SymbolPolyfill = typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol' ?
+        Symbol :
+        description => `Symbol(${description})`;
+
+    /// <reference lib="dom" />
+    function noop() {
+        return undefined;
+    }
+    function getGlobals() {
+        if (typeof self !== 'undefined') {
+            return self;
+        }
+        else if (typeof window !== 'undefined') {
+            return window;
+        }
+        else if (typeof global !== 'undefined') {
+            return global;
+        }
+        return undefined;
+    }
+    const globals = getGlobals();
+
+    function typeIsObject(x) {
+        return (typeof x === 'object' && x !== null) || typeof x === 'function';
+    }
+    const rethrowAssertionErrorRejection = noop;
+
+    const originalPromise = Promise;
+    const originalPromiseThen = Promise.prototype.then;
+    const originalPromiseResolve = Promise.resolve.bind(originalPromise);
+    const originalPromiseReject = Promise.reject.bind(originalPromise);
+    function newPromise(executor) {
+        return new originalPromise(executor);
+    }
+    function promiseResolvedWith(value) {
+        return originalPromiseResolve(value);
+    }
+    function promiseRejectedWith(reason) {
+        return originalPromiseReject(reason);
+    }
+    function PerformPromiseThen(promise, onFulfilled, onRejected) {
+        // There doesn't appear to be any way to correctly emulate the behaviour from JavaScript, so this is just an
+        // approximation.
+        return originalPromiseThen.call(promise, onFulfilled, onRejected);
+    }
+    function uponPromise(promise, onFulfilled, onRejected) {
+        PerformPromiseThen(PerformPromiseThen(promise, onFulfilled, onRejected), undefined, rethrowAssertionErrorRejection);
+    }
+    function uponFulfillment(promise, onFulfilled) {
+        uponPromise(promise, onFulfilled);
+    }
+    function uponRejection(promise, onRejected) {
+        uponPromise(promise, undefined, onRejected);
+    }
+    function transformPromiseWith(promise, fulfillmentHandler, rejectionHandler) {
+        return PerformPromiseThen(promise, fulfillmentHandler, rejectionHandler);
+    }
+    function setPromiseIsHandledToTrue(promise) {
+        PerformPromiseThen(promise, undefined, rethrowAssertionErrorRejection);
+    }
+    const queueMicrotask = (() => {
+        const globalQueueMicrotask = globals && globals.queueMicrotask;
+        if (typeof globalQueueMicrotask === 'function') {
+            return globalQueueMicrotask;
+        }
+        const resolvedPromise = promiseResolvedWith(undefined);
+        return (fn) => PerformPromiseThen(resolvedPromise, fn);
+    })();
+    function reflectCall(F, V, args) {
+        if (typeof F !== 'function') {
+            throw new TypeError('Argument is not a function');
+        }
+        return Function.prototype.apply.call(F, V, args);
+    }
+    function promiseCall(F, V, args) {
+        try {
+            return promiseResolvedWith(reflectCall(F, V, args));
+        }
+        catch (value) {
+            return promiseRejectedWith(value);
+        }
+    }
+
+    // Original from Chromium
+    // https://chromium.googlesource.com/chromium/src/+/0aee4434a4dba42a42abaea9bfbc0cd196a63bc1/third_party/blink/renderer/core/streams/SimpleQueue.js
+    const QUEUE_MAX_ARRAY_SIZE = 16384;
+    /**
+     * Simple queue structure.
+     *
+     * Avoids scalability issues with using a packed array directly by using
+     * multiple arrays in a linked list and keeping the array size bounded.
+     */
+    class SimpleQueue {
+        constructor() {
+            this._cursor = 0;
+            this._size = 0;
+            // _front and _back are always defined.
+            this._front = {
+                _elements: [],
+                _next: undefined
+            };
+            this._back = this._front;
+            // The cursor is used to avoid calling Array.shift().
+            // It contains the index of the front element of the array inside the
+            // front-most node. It is always in the range [0, QUEUE_MAX_ARRAY_SIZE).
+            this._cursor = 0;
+            // When there is only one node, size === elements.length - cursor.
+            this._size = 0;
+        }
+        get length() {
+            return this._size;
+        }
+        // For exception safety, this method is structured in order:
+        // 1. Read state
+        // 2. Calculate required state mutations
+        // 3. Perform state mutations
+        push(element) {
+            const oldBack = this._back;
+            let newBack = oldBack;
+            if (oldBack._elements.length === QUEUE_MAX_ARRAY_SIZE - 1) {
+                newBack = {
+                    _elements: [],
+                    _next: undefined
+                };
+            }
+            // push() is the mutation most likely to throw an exception, so it
+            // goes first.
+            oldBack._elements.push(element);
+            if (newBack !== oldBack) {
+                this._back = newBack;
+                oldBack._next = newBack;
+            }
+            ++this._size;
+        }
+        // Like push(), shift() follows the read -> calculate -> mutate pattern for
+        // exception safety.
+        shift() { // must not be called on an empty queue
+            const oldFront = this._front;
+            let newFront = oldFront;
+            const oldCursor = this._cursor;
+            let newCursor = oldCursor + 1;
+            const elements = oldFront._elements;
+            const element = elements[oldCursor];
+            if (newCursor === QUEUE_MAX_ARRAY_SIZE) {
+                newFront = oldFront._next;
+                newCursor = 0;
+            }
+            // No mutations before this point.
+            --this._size;
+            this._cursor = newCursor;
+            if (oldFront !== newFront) {
+                this._front = newFront;
+            }
+            // Permit shifted element to be garbage collected.
+            elements[oldCursor] = undefined;
+            return element;
+        }
+        // The tricky thing about forEach() is that it can be called
+        // re-entrantly. The queue may be mutated inside the callback. It is easy to
+        // see that push() within the callback has no negative effects since the end
+        // of the queue is checked for on every iteration. If shift() is called
+        // repeatedly within the callback then the next iteration may return an
+        // element that has been removed. In this case the callback will be called
+        // with undefined values until we either "catch up" with elements that still
+        // exist or reach the back of the queue.
+        forEach(callback) {
+            let i = this._cursor;
+            let node = this._front;
+            let elements = node._elements;
+            while (i !== elements.length || node._next !== undefined) {
+                if (i === elements.length) {
+                    node = node._next;
+                    elements = node._elements;
+                    i = 0;
+                    if (elements.length === 0) {
+                        break;
+                    }
+                }
+                callback(elements[i]);
+                ++i;
+            }
+        }
+        // Return the element that would be returned if shift() was called now,
+        // without modifying the queue.
+        peek() { // must not be called on an empty queue
+            const front = this._front;
+            const cursor = this._cursor;
+            return front._elements[cursor];
+        }
+    }
+
+    function ReadableStreamReaderGenericInitialize(reader, stream) {
+        reader._ownerReadableStream = stream;
+        stream._reader = reader;
+        if (stream._state === 'readable') {
+            defaultReaderClosedPromiseInitialize(reader);
+        }
+        else if (stream._state === 'closed') {
+            defaultReaderClosedPromiseInitializeAsResolved(reader);
+        }
+        else {
+            defaultReaderClosedPromiseInitializeAsRejected(reader, stream._storedError);
+        }
+    }
+    // A client of ReadableStreamDefaultReader and ReadableStreamBYOBReader may use these functions directly to bypass state
+    // check.
+    function ReadableStreamReaderGenericCancel(reader, reason) {
+        const stream = reader._ownerReadableStream;
+        return ReadableStreamCancel(stream, reason);
+    }
+    function ReadableStreamReaderGenericRelease(reader) {
+        if (reader._ownerReadableStream._state === 'readable') {
+            defaultReaderClosedPromiseReject(reader, new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));
+        }
+        else {
+            defaultReaderClosedPromiseResetToRejected(reader, new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));
+        }
+        reader._ownerReadableStream._reader = undefined;
+        reader._ownerReadableStream = undefined;
+    }
+    // Helper functions for the readers.
+    function readerLockException(name) {
+        return new TypeError('Cannot ' + name + ' a stream using a released reader');
+    }
+    // Helper functions for the ReadableStreamDefaultReader.
+    function defaultReaderClosedPromiseInitialize(reader) {
+        reader._closedPromise = newPromise((resolve, reject) => {
+            reader._closedPromise_resolve = resolve;
+            reader._closedPromise_reject = reject;
+        });
+    }
+    function defaultReaderClosedPromiseInitializeAsRejected(reader, reason) {
+        defaultReaderClosedPromiseInitialize(reader);
+        defaultReaderClosedPromiseReject(reader, reason);
+    }
+    function defaultReaderClosedPromiseInitializeAsResolved(reader) {
+        defaultReaderClosedPromiseInitialize(reader);
+        defaultReaderClosedPromiseResolve(reader);
+    }
+    function defaultReaderClosedPromiseReject(reader, reason) {
+        if (reader._closedPromise_reject === undefined) {
+            return;
+        }
+        setPromiseIsHandledToTrue(reader._closedPromise);
+        reader._closedPromise_reject(reason);
+        reader._closedPromise_resolve = undefined;
+        reader._closedPromise_reject = undefined;
+    }
+    function defaultReaderClosedPromiseResetToRejected(reader, reason) {
+        defaultReaderClosedPromiseInitializeAsRejected(reader, reason);
+    }
+    function defaultReaderClosedPromiseResolve(reader) {
+        if (reader._closedPromise_resolve === undefined) {
+            return;
+        }
+        reader._closedPromise_resolve(undefined);
+        reader._closedPromise_resolve = undefined;
+        reader._closedPromise_reject = undefined;
+    }
+
+    const AbortSteps = SymbolPolyfill('[[AbortSteps]]');
+    const ErrorSteps = SymbolPolyfill('[[ErrorSteps]]');
+    const CancelSteps = SymbolPolyfill('[[CancelSteps]]');
+    const PullSteps = SymbolPolyfill('[[PullSteps]]');
+
+    /// <reference lib="es2015.core" />
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite#Polyfill
+    const NumberIsFinite = Number.isFinite || function (x) {
+        return typeof x === 'number' && isFinite(x);
+    };
+
+    /// <reference lib="es2015.core" />
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc#Polyfill
+    const MathTrunc = Math.trunc || function (v) {
+        return v < 0 ? Math.ceil(v) : Math.floor(v);
+    };
+
+    // https://heycam.github.io/webidl/#idl-dictionaries
+    function isDictionary(x) {
+        return typeof x === 'object' || typeof x === 'function';
+    }
+    function assertDictionary(obj, context) {
+        if (obj !== undefined && !isDictionary(obj)) {
+            throw new TypeError(`${context} is not an object.`);
+        }
+    }
+    // https://heycam.github.io/webidl/#idl-callback-functions
+    function assertFunction(x, context) {
+        if (typeof x !== 'function') {
+            throw new TypeError(`${context} is not a function.`);
+        }
+    }
+    // https://heycam.github.io/webidl/#idl-object
+    function isObject(x) {
+        return (typeof x === 'object' && x !== null) || typeof x === 'function';
+    }
+    function assertObject(x, context) {
+        if (!isObject(x)) {
+            throw new TypeError(`${context} is not an object.`);
+        }
+    }
+    function assertRequiredArgument(x, position, context) {
+        if (x === undefined) {
+            throw new TypeError(`Parameter ${position} is required in '${context}'.`);
+        }
+    }
+    function assertRequiredField(x, field, context) {
+        if (x === undefined) {
+            throw new TypeError(`${field} is required in '${context}'.`);
+        }
+    }
+    // https://heycam.github.io/webidl/#idl-unrestricted-double
+    function convertUnrestrictedDouble(value) {
+        return Number(value);
+    }
+    function censorNegativeZero(x) {
+        return x === 0 ? 0 : x;
+    }
+    function integerPart(x) {
+        return censorNegativeZero(MathTrunc(x));
+    }
+    // https://heycam.github.io/webidl/#idl-unsigned-long-long
+    function convertUnsignedLongLongWithEnforceRange(value, context) {
+        const lowerBound = 0;
+        const upperBound = Number.MAX_SAFE_INTEGER;
+        let x = Number(value);
+        x = censorNegativeZero(x);
+        if (!NumberIsFinite(x)) {
+            throw new TypeError(`${context} is not a finite number`);
+        }
+        x = integerPart(x);
+        if (x < lowerBound || x > upperBound) {
+            throw new TypeError(`${context} is outside the accepted range of ${lowerBound} to ${upperBound}, inclusive`);
+        }
+        if (!NumberIsFinite(x) || x === 0) {
+            return 0;
+        }
+        // TODO Use BigInt if supported?
+        // let xBigInt = BigInt(integerPart(x));
+        // xBigInt = BigInt.asUintN(64, xBigInt);
+        // return Number(xBigInt);
+        return x;
+    }
+
+    function assertReadableStream(x, context) {
+        if (!IsReadableStream(x)) {
+            throw new TypeError(`${context} is not a ReadableStream.`);
+        }
+    }
+
+    // Abstract operations for the ReadableStream.
+    function AcquireReadableStreamDefaultReader(stream) {
+        return new ReadableStreamDefaultReader(stream);
+    }
+    // ReadableStream API exposed for controllers.
+    function ReadableStreamAddReadRequest(stream, readRequest) {
+        stream._reader._readRequests.push(readRequest);
+    }
+    function ReadableStreamFulfillReadRequest(stream, chunk, done) {
+        const reader = stream._reader;
+        const readRequest = reader._readRequests.shift();
+        if (done) {
+            readRequest._closeSteps();
+        }
+        else {
+            readRequest._chunkSteps(chunk);
+        }
+    }
+    function ReadableStreamGetNumReadRequests(stream) {
+        return stream._reader._readRequests.length;
+    }
+    function ReadableStreamHasDefaultReader(stream) {
+        const reader = stream._reader;
+        if (reader === undefined) {
+            return false;
+        }
+        if (!IsReadableStreamDefaultReader(reader)) {
+            return false;
+        }
+        return true;
+    }
+    /**
+     * A default reader vended by a {@link ReadableStream}.
+     *
+     * @public
+     */
+    class ReadableStreamDefaultReader {
+        constructor(stream) {
+            assertRequiredArgument(stream, 1, 'ReadableStreamDefaultReader');
+            assertReadableStream(stream, 'First parameter');
+            if (IsReadableStreamLocked(stream)) {
+                throw new TypeError('This stream has already been locked for exclusive reading by another reader');
+            }
+            ReadableStreamReaderGenericInitialize(this, stream);
+            this._readRequests = new SimpleQueue();
+        }
+        /**
+         * Returns a promise that will be fulfilled when the stream becomes closed,
+         * or rejected if the stream ever errors or the reader's lock is released before the stream finishes closing.
+         */
+        get closed() {
+            if (!IsReadableStreamDefaultReader(this)) {
+                return promiseRejectedWith(defaultReaderBrandCheckException('closed'));
+            }
+            return this._closedPromise;
+        }
+        /**
+         * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.
+         */
+        cancel(reason = undefined) {
+            if (!IsReadableStreamDefaultReader(this)) {
+                return promiseRejectedWith(defaultReaderBrandCheckException('cancel'));
+            }
+            if (this._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('cancel'));
+            }
+            return ReadableStreamReaderGenericCancel(this, reason);
+        }
+        /**
+         * Returns a promise that allows access to the next chunk from the stream's internal queue, if available.
+         *
+         * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.
+         */
+        read() {
+            if (!IsReadableStreamDefaultReader(this)) {
+                return promiseRejectedWith(defaultReaderBrandCheckException('read'));
+            }
+            if (this._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('read from'));
+            }
+            let resolvePromise;
+            let rejectPromise;
+            const promise = newPromise((resolve, reject) => {
+                resolvePromise = resolve;
+                rejectPromise = reject;
+            });
+            const readRequest = {
+                _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),
+                _closeSteps: () => resolvePromise({ value: undefined, done: true }),
+                _errorSteps: e => rejectPromise(e)
+            };
+            ReadableStreamDefaultReaderRead(this, readRequest);
+            return promise;
+        }
+        /**
+         * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.
+         * If the associated stream is errored when the lock is released, the reader will appear errored in the same way
+         * from now on; otherwise, the reader will appear closed.
+         *
+         * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by
+         * the reader's {@link ReadableStreamDefaultReader.read | read()} method has not yet been settled. Attempting to
+         * do so will throw a `TypeError` and leave the reader locked to the stream.
+         */
+        releaseLock() {
+            if (!IsReadableStreamDefaultReader(this)) {
+                throw defaultReaderBrandCheckException('releaseLock');
+            }
+            if (this._ownerReadableStream === undefined) {
+                return;
+            }
+            if (this._readRequests.length > 0) {
+                throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');
+            }
+            ReadableStreamReaderGenericRelease(this);
+        }
+    }
+    Object.defineProperties(ReadableStreamDefaultReader.prototype, {
+        cancel: { enumerable: true },
+        read: { enumerable: true },
+        releaseLock: { enumerable: true },
+        closed: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableStreamDefaultReader.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableStreamDefaultReader',
+            configurable: true
+        });
+    }
+    // Abstract operations for the readers.
+    function IsReadableStreamDefaultReader(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_readRequests')) {
+            return false;
+        }
+        return x instanceof ReadableStreamDefaultReader;
+    }
+    function ReadableStreamDefaultReaderRead(reader, readRequest) {
+        const stream = reader._ownerReadableStream;
+        stream._disturbed = true;
+        if (stream._state === 'closed') {
+            readRequest._closeSteps();
+        }
+        else if (stream._state === 'errored') {
+            readRequest._errorSteps(stream._storedError);
+        }
+        else {
+            stream._readableStreamController[PullSteps](readRequest);
+        }
+    }
+    // Helper functions for the ReadableStreamDefaultReader.
+    function defaultReaderBrandCheckException(name) {
+        return new TypeError(`ReadableStreamDefaultReader.prototype.${name} can only be used on a ReadableStreamDefaultReader`);
+    }
+
+    /// <reference lib="es2018.asynciterable" />
+    let AsyncIteratorPrototype;
+    if (typeof SymbolPolyfill.asyncIterator === 'symbol') {
+        // We're running inside a ES2018+ environment, but we're compiling to an older syntax.
+        // We cannot access %AsyncIteratorPrototype% without non-ES2018 syntax, but we can re-create it.
+        AsyncIteratorPrototype = {
+            // 25.1.3.1 %AsyncIteratorPrototype% [ @@asyncIterator ] ( )
+            // https://tc39.github.io/ecma262/#sec-asynciteratorprototype-asynciterator
+            [SymbolPolyfill.asyncIterator]() {
+                return this;
+            }
+        };
+        Object.defineProperty(AsyncIteratorPrototype, SymbolPolyfill.asyncIterator, { enumerable: false });
+    }
+
+    /// <reference lib="es2018.asynciterable" />
+    class ReadableStreamAsyncIteratorImpl {
+        constructor(reader, preventCancel) {
+            this._ongoingPromise = undefined;
+            this._isFinished = false;
+            this._reader = reader;
+            this._preventCancel = preventCancel;
+        }
+        next() {
+            const nextSteps = () => this._nextSteps();
+            this._ongoingPromise = this._ongoingPromise ?
+                transformPromiseWith(this._ongoingPromise, nextSteps, nextSteps) :
+                nextSteps();
+            return this._ongoingPromise;
+        }
+        return(value) {
+            const returnSteps = () => this._returnSteps(value);
+            return this._ongoingPromise ?
+                transformPromiseWith(this._ongoingPromise, returnSteps, returnSteps) :
+                returnSteps();
+        }
+        _nextSteps() {
+            if (this._isFinished) {
+                return Promise.resolve({ value: undefined, done: true });
+            }
+            const reader = this._reader;
+            if (reader._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('iterate'));
+            }
+            let resolvePromise;
+            let rejectPromise;
+            const promise = newPromise((resolve, reject) => {
+                resolvePromise = resolve;
+                rejectPromise = reject;
+            });
+            const readRequest = {
+                _chunkSteps: chunk => {
+                    this._ongoingPromise = undefined;
+                    // This needs to be delayed by one microtask, otherwise we stop pulling too early which breaks a test.
+                    // FIXME Is this a bug in the specification, or in the test?
+                    queueMicrotask(() => resolvePromise({ value: chunk, done: false }));
+                },
+                _closeSteps: () => {
+                    this._ongoingPromise = undefined;
+                    this._isFinished = true;
+                    ReadableStreamReaderGenericRelease(reader);
+                    resolvePromise({ value: undefined, done: true });
+                },
+                _errorSteps: reason => {
+                    this._ongoingPromise = undefined;
+                    this._isFinished = true;
+                    ReadableStreamReaderGenericRelease(reader);
+                    rejectPromise(reason);
+                }
+            };
+            ReadableStreamDefaultReaderRead(reader, readRequest);
+            return promise;
+        }
+        _returnSteps(value) {
+            if (this._isFinished) {
+                return Promise.resolve({ value, done: true });
+            }
+            this._isFinished = true;
+            const reader = this._reader;
+            if (reader._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('finish iterating'));
+            }
+            if (!this._preventCancel) {
+                const result = ReadableStreamReaderGenericCancel(reader, value);
+                ReadableStreamReaderGenericRelease(reader);
+                return transformPromiseWith(result, () => ({ value, done: true }));
+            }
+            ReadableStreamReaderGenericRelease(reader);
+            return promiseResolvedWith({ value, done: true });
+        }
+    }
+    const ReadableStreamAsyncIteratorPrototype = {
+        next() {
+            if (!IsReadableStreamAsyncIterator(this)) {
+                return promiseRejectedWith(streamAsyncIteratorBrandCheckException('next'));
+            }
+            return this._asyncIteratorImpl.next();
+        },
+        return(value) {
+            if (!IsReadableStreamAsyncIterator(this)) {
+                return promiseRejectedWith(streamAsyncIteratorBrandCheckException('return'));
+            }
+            return this._asyncIteratorImpl.return(value);
+        }
+    };
+    if (AsyncIteratorPrototype !== undefined) {
+        Object.setPrototypeOf(ReadableStreamAsyncIteratorPrototype, AsyncIteratorPrototype);
+    }
+    // Abstract operations for the ReadableStream.
+    function AcquireReadableStreamAsyncIterator(stream, preventCancel) {
+        const reader = AcquireReadableStreamDefaultReader(stream);
+        const impl = new ReadableStreamAsyncIteratorImpl(reader, preventCancel);
+        const iterator = Object.create(ReadableStreamAsyncIteratorPrototype);
+        iterator._asyncIteratorImpl = impl;
+        return iterator;
+    }
+    function IsReadableStreamAsyncIterator(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_asyncIteratorImpl')) {
+            return false;
+        }
+        try {
+            // noinspection SuspiciousTypeOfGuard
+            return x._asyncIteratorImpl instanceof
+                ReadableStreamAsyncIteratorImpl;
+        }
+        catch (_a) {
+            return false;
+        }
+    }
+    // Helper functions for the ReadableStream.
+    function streamAsyncIteratorBrandCheckException(name) {
+        return new TypeError(`ReadableStreamAsyncIterator.${name} can only be used on a ReadableSteamAsyncIterator`);
+    }
+
+    /// <reference lib="es2015.core" />
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Polyfill
+    const NumberIsNaN = Number.isNaN || function (x) {
+        // eslint-disable-next-line no-self-compare
+        return x !== x;
+    };
+
+    function CreateArrayFromList(elements) {
+        // We use arrays to represent lists, so this is basically a no-op.
+        // Do a slice though just in case we happen to depend on the unique-ness.
+        return elements.slice();
+    }
+    function CopyDataBlockBytes(dest, destOffset, src, srcOffset, n) {
+        new Uint8Array(dest).set(new Uint8Array(src, srcOffset, n), destOffset);
+    }
+    // Not implemented correctly
+    function TransferArrayBuffer(O) {
+        return O;
+    }
+    // Not implemented correctly
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    function IsDetachedBuffer(O) {
+        return false;
+    }
+    function ArrayBufferSlice(buffer, begin, end) {
+        // ArrayBuffer.prototype.slice is not available on IE10
+        // https://www.caniuse.com/mdn-javascript_builtins_arraybuffer_slice
+        if (buffer.slice) {
+            return buffer.slice(begin, end);
+        }
+        const length = end - begin;
+        const slice = new ArrayBuffer(length);
+        CopyDataBlockBytes(slice, 0, buffer, begin, length);
+        return slice;
+    }
+
+    function IsNonNegativeNumber(v) {
+        if (typeof v !== 'number') {
+            return false;
+        }
+        if (NumberIsNaN(v)) {
+            return false;
+        }
+        if (v < 0) {
+            return false;
+        }
+        return true;
+    }
+    function CloneAsUint8Array(O) {
+        const buffer = ArrayBufferSlice(O.buffer, O.byteOffset, O.byteOffset + O.byteLength);
+        return new Uint8Array(buffer);
+    }
+
+    function DequeueValue(container) {
+        const pair = container._queue.shift();
+        container._queueTotalSize -= pair.size;
+        if (container._queueTotalSize < 0) {
+            container._queueTotalSize = 0;
+        }
+        return pair.value;
+    }
+    function EnqueueValueWithSize(container, value, size) {
+        if (!IsNonNegativeNumber(size) || size === Infinity) {
+            throw new RangeError('Size must be a finite, non-NaN, non-negative number.');
+        }
+        container._queue.push({ value, size });
+        container._queueTotalSize += size;
+    }
+    function PeekQueueValue(container) {
+        const pair = container._queue.peek();
+        return pair.value;
+    }
+    function ResetQueue(container) {
+        container._queue = new SimpleQueue();
+        container._queueTotalSize = 0;
+    }
+
+    /**
+     * A pull-into request in a {@link ReadableByteStreamController}.
+     *
+     * @public
+     */
+    class ReadableStreamBYOBRequest {
+        constructor() {
+            throw new TypeError('Illegal constructor');
+        }
+        /**
+         * Returns the view for writing in to, or `null` if the BYOB request has already been responded to.
+         */
+        get view() {
+            if (!IsReadableStreamBYOBRequest(this)) {
+                throw byobRequestBrandCheckException('view');
+            }
+            return this._view;
+        }
+        respond(bytesWritten) {
+            if (!IsReadableStreamBYOBRequest(this)) {
+                throw byobRequestBrandCheckException('respond');
+            }
+            assertRequiredArgument(bytesWritten, 1, 'respond');
+            bytesWritten = convertUnsignedLongLongWithEnforceRange(bytesWritten, 'First parameter');
+            if (this._associatedReadableByteStreamController === undefined) {
+                throw new TypeError('This BYOB request has been invalidated');
+            }
+            if (IsDetachedBuffer(this._view.buffer)) ;
+            ReadableByteStreamControllerRespond(this._associatedReadableByteStreamController, bytesWritten);
+        }
+        respondWithNewView(view) {
+            if (!IsReadableStreamBYOBRequest(this)) {
+                throw byobRequestBrandCheckException('respondWithNewView');
+            }
+            assertRequiredArgument(view, 1, 'respondWithNewView');
+            if (!ArrayBuffer.isView(view)) {
+                throw new TypeError('You can only respond with array buffer views');
+            }
+            if (this._associatedReadableByteStreamController === undefined) {
+                throw new TypeError('This BYOB request has been invalidated');
+            }
+            if (IsDetachedBuffer(view.buffer)) ;
+            ReadableByteStreamControllerRespondWithNewView(this._associatedReadableByteStreamController, view);
+        }
+    }
+    Object.defineProperties(ReadableStreamBYOBRequest.prototype, {
+        respond: { enumerable: true },
+        respondWithNewView: { enumerable: true },
+        view: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableStreamBYOBRequest.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableStreamBYOBRequest',
+            configurable: true
+        });
+    }
+    /**
+     * Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue.
+     *
+     * @public
+     */
+    class ReadableByteStreamController {
+        constructor() {
+            throw new TypeError('Illegal constructor');
+        }
+        /**
+         * Returns the current BYOB pull request, or `null` if there isn't one.
+         */
+        get byobRequest() {
+            if (!IsReadableByteStreamController(this)) {
+                throw byteStreamControllerBrandCheckException('byobRequest');
+            }
+            return ReadableByteStreamControllerGetBYOBRequest(this);
+        }
+        /**
+         * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is
+         * over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure.
+         */
+        get desiredSize() {
+            if (!IsReadableByteStreamController(this)) {
+                throw byteStreamControllerBrandCheckException('desiredSize');
+            }
+            return ReadableByteStreamControllerGetDesiredSize(this);
+        }
+        /**
+         * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from
+         * the stream, but once those are read, the stream will become closed.
+         */
+        close() {
+            if (!IsReadableByteStreamController(this)) {
+                throw byteStreamControllerBrandCheckException('close');
+            }
+            if (this._closeRequested) {
+                throw new TypeError('The stream has already been closed; do not close it again!');
+            }
+            const state = this._controlledReadableByteStream._state;
+            if (state !== 'readable') {
+                throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be closed`);
+            }
+            ReadableByteStreamControllerClose(this);
+        }
+        enqueue(chunk) {
+            if (!IsReadableByteStreamController(this)) {
+                throw byteStreamControllerBrandCheckException('enqueue');
+            }
+            assertRequiredArgument(chunk, 1, 'enqueue');
+            if (!ArrayBuffer.isView(chunk)) {
+                throw new TypeError('chunk must be an array buffer view');
+            }
+            if (chunk.byteLength === 0) {
+                throw new TypeError('chunk must have non-zero byteLength');
+            }
+            if (chunk.buffer.byteLength === 0) {
+                throw new TypeError(`chunk's buffer must have non-zero byteLength`);
+            }
+            if (this._closeRequested) {
+                throw new TypeError('stream is closed or draining');
+            }
+            const state = this._controlledReadableByteStream._state;
+            if (state !== 'readable') {
+                throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be enqueued to`);
+            }
+            ReadableByteStreamControllerEnqueue(this, chunk);
+        }
+        /**
+         * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.
+         */
+        error(e = undefined) {
+            if (!IsReadableByteStreamController(this)) {
+                throw byteStreamControllerBrandCheckException('error');
+            }
+            ReadableByteStreamControllerError(this, e);
+        }
+        /** @internal */
+        [CancelSteps](reason) {
+            ReadableByteStreamControllerClearPendingPullIntos(this);
+            ResetQueue(this);
+            const result = this._cancelAlgorithm(reason);
+            ReadableByteStreamControllerClearAlgorithms(this);
+            return result;
+        }
+        /** @internal */
+        [PullSteps](readRequest) {
+            const stream = this._controlledReadableByteStream;
+            if (this._queueTotalSize > 0) {
+                const entry = this._queue.shift();
+                this._queueTotalSize -= entry.byteLength;
+                ReadableByteStreamControllerHandleQueueDrain(this);
+                const view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);
+                readRequest._chunkSteps(view);
+                return;
+            }
+            const autoAllocateChunkSize = this._autoAllocateChunkSize;
+            if (autoAllocateChunkSize !== undefined) {
+                let buffer;
+                try {
+                    buffer = new ArrayBuffer(autoAllocateChunkSize);
+                }
+                catch (bufferE) {
+                    readRequest._errorSteps(bufferE);
+                    return;
+                }
+                const pullIntoDescriptor = {
+                    buffer,
+                    bufferByteLength: autoAllocateChunkSize,
+                    byteOffset: 0,
+                    byteLength: autoAllocateChunkSize,
+                    bytesFilled: 0,
+                    elementSize: 1,
+                    viewConstructor: Uint8Array,
+                    readerType: 'default'
+                };
+                this._pendingPullIntos.push(pullIntoDescriptor);
+            }
+            ReadableStreamAddReadRequest(stream, readRequest);
+            ReadableByteStreamControllerCallPullIfNeeded(this);
+        }
+    }
+    Object.defineProperties(ReadableByteStreamController.prototype, {
+        close: { enumerable: true },
+        enqueue: { enumerable: true },
+        error: { enumerable: true },
+        byobRequest: { enumerable: true },
+        desiredSize: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableByteStreamController.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableByteStreamController',
+            configurable: true
+        });
+    }
+    // Abstract operations for the ReadableByteStreamController.
+    function IsReadableByteStreamController(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableByteStream')) {
+            return false;
+        }
+        return x instanceof ReadableByteStreamController;
+    }
+    function IsReadableStreamBYOBRequest(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_associatedReadableByteStreamController')) {
+            return false;
+        }
+        return x instanceof ReadableStreamBYOBRequest;
+    }
+    function ReadableByteStreamControllerCallPullIfNeeded(controller) {
+        const shouldPull = ReadableByteStreamControllerShouldCallPull(controller);
+        if (!shouldPull) {
+            return;
+        }
+        if (controller._pulling) {
+            controller._pullAgain = true;
+            return;
+        }
+        controller._pulling = true;
+        // TODO: Test controller argument
+        const pullPromise = controller._pullAlgorithm();
+        uponPromise(pullPromise, () => {
+            controller._pulling = false;
+            if (controller._pullAgain) {
+                controller._pullAgain = false;
+                ReadableByteStreamControllerCallPullIfNeeded(controller);
+            }
+        }, e => {
+            ReadableByteStreamControllerError(controller, e);
+        });
+    }
+    function ReadableByteStreamControllerClearPendingPullIntos(controller) {
+        ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+        controller._pendingPullIntos = new SimpleQueue();
+    }
+    function ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor) {
+        let done = false;
+        if (stream._state === 'closed') {
+            done = true;
+        }
+        const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor);
+        if (pullIntoDescriptor.readerType === 'default') {
+            ReadableStreamFulfillReadRequest(stream, filledView, done);
+        }
+        else {
+            ReadableStreamFulfillReadIntoRequest(stream, filledView, done);
+        }
+    }
+    function ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor) {
+        const bytesFilled = pullIntoDescriptor.bytesFilled;
+        const elementSize = pullIntoDescriptor.elementSize;
+        return new pullIntoDescriptor.viewConstructor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize);
+    }
+    function ReadableByteStreamControllerEnqueueChunkToQueue(controller, buffer, byteOffset, byteLength) {
+        controller._queue.push({ buffer, byteOffset, byteLength });
+        controller._queueTotalSize += byteLength;
+    }
+    function ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor) {
+        const elementSize = pullIntoDescriptor.elementSize;
+        const currentAlignedBytes = pullIntoDescriptor.bytesFilled - pullIntoDescriptor.bytesFilled % elementSize;
+        const maxBytesToCopy = Math.min(controller._queueTotalSize, pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled);
+        const maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;
+        const maxAlignedBytes = maxBytesFilled - maxBytesFilled % elementSize;
+        let totalBytesToCopyRemaining = maxBytesToCopy;
+        let ready = false;
+        if (maxAlignedBytes > currentAlignedBytes) {
+            totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled;
+            ready = true;
+        }
+        const queue = controller._queue;
+        while (totalBytesToCopyRemaining > 0) {
+            const headOfQueue = queue.peek();
+            const bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength);
+            const destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;
+            CopyDataBlockBytes(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy);
+            if (headOfQueue.byteLength === bytesToCopy) {
+                queue.shift();
+            }
+            else {
+                headOfQueue.byteOffset += bytesToCopy;
+                headOfQueue.byteLength -= bytesToCopy;
+            }
+            controller._queueTotalSize -= bytesToCopy;
+            ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor);
+            totalBytesToCopyRemaining -= bytesToCopy;
+        }
+        return ready;
+    }
+    function ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, size, pullIntoDescriptor) {
+        pullIntoDescriptor.bytesFilled += size;
+    }
+    function ReadableByteStreamControllerHandleQueueDrain(controller) {
+        if (controller._queueTotalSize === 0 && controller._closeRequested) {
+            ReadableByteStreamControllerClearAlgorithms(controller);
+            ReadableStreamClose(controller._controlledReadableByteStream);
+        }
+        else {
+            ReadableByteStreamControllerCallPullIfNeeded(controller);
+        }
+    }
+    function ReadableByteStreamControllerInvalidateBYOBRequest(controller) {
+        if (controller._byobRequest === null) {
+            return;
+        }
+        controller._byobRequest._associatedReadableByteStreamController = undefined;
+        controller._byobRequest._view = null;
+        controller._byobRequest = null;
+    }
+    function ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller) {
+        while (controller._pendingPullIntos.length > 0) {
+            if (controller._queueTotalSize === 0) {
+                return;
+            }
+            const pullIntoDescriptor = controller._pendingPullIntos.peek();
+            if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {
+                ReadableByteStreamControllerShiftPendingPullInto(controller);
+                ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);
+            }
+        }
+    }
+    function ReadableByteStreamControllerPullInto(controller, view, readIntoRequest) {
+        const stream = controller._controlledReadableByteStream;
+        let elementSize = 1;
+        if (view.constructor !== DataView) {
+            elementSize = view.constructor.BYTES_PER_ELEMENT;
+        }
+        const ctor = view.constructor;
+        // try {
+        const buffer = TransferArrayBuffer(view.buffer);
+        // } catch (e) {
+        //   readIntoRequest._errorSteps(e);
+        //   return;
+        // }
+        const pullIntoDescriptor = {
+            buffer,
+            bufferByteLength: buffer.byteLength,
+            byteOffset: view.byteOffset,
+            byteLength: view.byteLength,
+            bytesFilled: 0,
+            elementSize,
+            viewConstructor: ctor,
+            readerType: 'byob'
+        };
+        if (controller._pendingPullIntos.length > 0) {
+            controller._pendingPullIntos.push(pullIntoDescriptor);
+            // No ReadableByteStreamControllerCallPullIfNeeded() call since:
+            // - No change happens on desiredSize
+            // - The source has already been notified of that there's at least 1 pending read(view)
+            ReadableStreamAddReadIntoRequest(stream, readIntoRequest);
+            return;
+        }
+        if (stream._state === 'closed') {
+            const emptyView = new ctor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0);
+            readIntoRequest._closeSteps(emptyView);
+            return;
+        }
+        if (controller._queueTotalSize > 0) {
+            if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {
+                const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor);
+                ReadableByteStreamControllerHandleQueueDrain(controller);
+                readIntoRequest._chunkSteps(filledView);
+                return;
+            }
+            if (controller._closeRequested) {
+                const e = new TypeError('Insufficient bytes to fill elements in the given buffer');
+                ReadableByteStreamControllerError(controller, e);
+                readIntoRequest._errorSteps(e);
+                return;
+            }
+        }
+        controller._pendingPullIntos.push(pullIntoDescriptor);
+        ReadableStreamAddReadIntoRequest(stream, readIntoRequest);
+        ReadableByteStreamControllerCallPullIfNeeded(controller);
+    }
+    function ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor) {
+        const stream = controller._controlledReadableByteStream;
+        if (ReadableStreamHasBYOBReader(stream)) {
+            while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {
+                const pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);
+                ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);
+            }
+        }
+    }
+    function ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, pullIntoDescriptor) {
+        ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor);
+        if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {
+            return;
+        }
+        ReadableByteStreamControllerShiftPendingPullInto(controller);
+        const remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize;
+        if (remainderSize > 0) {
+            const end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;
+            const remainder = ArrayBufferSlice(pullIntoDescriptor.buffer, end - remainderSize, end);
+            ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength);
+        }
+        pullIntoDescriptor.bytesFilled -= remainderSize;
+        ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);
+        ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);
+    }
+    function ReadableByteStreamControllerRespondInternal(controller, bytesWritten) {
+        const firstDescriptor = controller._pendingPullIntos.peek();
+        ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+        const state = controller._controlledReadableByteStream._state;
+        if (state === 'closed') {
+            ReadableByteStreamControllerRespondInClosedState(controller);
+        }
+        else {
+            ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);
+        }
+        ReadableByteStreamControllerCallPullIfNeeded(controller);
+    }
+    function ReadableByteStreamControllerShiftPendingPullInto(controller) {
+        const descriptor = controller._pendingPullIntos.shift();
+        return descriptor;
+    }
+    function ReadableByteStreamControllerShouldCallPull(controller) {
+        const stream = controller._controlledReadableByteStream;
+        if (stream._state !== 'readable') {
+            return false;
+        }
+        if (controller._closeRequested) {
+            return false;
+        }
+        if (!controller._started) {
+            return false;
+        }
+        if (ReadableStreamHasDefaultReader(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+            return true;
+        }
+        if (ReadableStreamHasBYOBReader(stream) && ReadableStreamGetNumReadIntoRequests(stream) > 0) {
+            return true;
+        }
+        const desiredSize = ReadableByteStreamControllerGetDesiredSize(controller);
+        if (desiredSize > 0) {
+            return true;
+        }
+        return false;
+    }
+    function ReadableByteStreamControllerClearAlgorithms(controller) {
+        controller._pullAlgorithm = undefined;
+        controller._cancelAlgorithm = undefined;
+    }
+    // A client of ReadableByteStreamController may use these functions directly to bypass state check.
+    function ReadableByteStreamControllerClose(controller) {
+        const stream = controller._controlledReadableByteStream;
+        if (controller._closeRequested || stream._state !== 'readable') {
+            return;
+        }
+        if (controller._queueTotalSize > 0) {
+            controller._closeRequested = true;
+            return;
+        }
+        if (controller._pendingPullIntos.length > 0) {
+            const firstPendingPullInto = controller._pendingPullIntos.peek();
+            if (firstPendingPullInto.bytesFilled > 0) {
+                const e = new TypeError('Insufficient bytes to fill elements in the given buffer');
+                ReadableByteStreamControllerError(controller, e);
+                throw e;
+            }
+        }
+        ReadableByteStreamControllerClearAlgorithms(controller);
+        ReadableStreamClose(stream);
+    }
+    function ReadableByteStreamControllerEnqueue(controller, chunk) {
+        const stream = controller._controlledReadableByteStream;
+        if (controller._closeRequested || stream._state !== 'readable') {
+            return;
+        }
+        const buffer = chunk.buffer;
+        const byteOffset = chunk.byteOffset;
+        const byteLength = chunk.byteLength;
+        const transferredBuffer = TransferArrayBuffer(buffer);
+        if (controller._pendingPullIntos.length > 0) {
+            const firstPendingPullInto = controller._pendingPullIntos.peek();
+            if (IsDetachedBuffer(firstPendingPullInto.buffer)) ;
+            firstPendingPullInto.buffer = TransferArrayBuffer(firstPendingPullInto.buffer);
+        }
+        ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+        if (ReadableStreamHasDefaultReader(stream)) {
+            if (ReadableStreamGetNumReadRequests(stream) === 0) {
+                ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+            }
+            else {
+                if (controller._pendingPullIntos.length > 0) {
+                    ReadableByteStreamControllerShiftPendingPullInto(controller);
+                }
+                const transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength);
+                ReadableStreamFulfillReadRequest(stream, transferredView, false);
+            }
+        }
+        else if (ReadableStreamHasBYOBReader(stream)) {
+            // TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully.
+            ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+            ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);
+        }
+        else {
+            ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+        }
+        ReadableByteStreamControllerCallPullIfNeeded(controller);
+    }
+    function ReadableByteStreamControllerError(controller, e) {
+        const stream = controller._controlledReadableByteStream;
+        if (stream._state !== 'readable') {
+            return;
+        }
+        ReadableByteStreamControllerClearPendingPullIntos(controller);
+        ResetQueue(controller);
+        ReadableByteStreamControllerClearAlgorithms(controller);
+        ReadableStreamError(stream, e);
+    }
+    function ReadableByteStreamControllerGetBYOBRequest(controller) {
+        if (controller._byobRequest === null && controller._pendingPullIntos.length > 0) {
+            const firstDescriptor = controller._pendingPullIntos.peek();
+            const view = new Uint8Array(firstDescriptor.buffer, firstDescriptor.byteOffset + firstDescriptor.bytesFilled, firstDescriptor.byteLength - firstDescriptor.bytesFilled);
+            const byobRequest = Object.create(ReadableStreamBYOBRequest.prototype);
+            SetUpReadableStreamBYOBRequest(byobRequest, controller, view);
+            controller._byobRequest = byobRequest;
+        }
+        return controller._byobRequest;
+    }
+    function ReadableByteStreamControllerGetDesiredSize(controller) {
+        const state = controller._controlledReadableByteStream._state;
+        if (state === 'errored') {
+            return null;
+        }
+        if (state === 'closed') {
+            return 0;
+        }
+        return controller._strategyHWM - controller._queueTotalSize;
+    }
+    function ReadableByteStreamControllerRespond(controller, bytesWritten) {
+        const firstDescriptor = controller._pendingPullIntos.peek();
+        const state = controller._controlledReadableByteStream._state;
+        if (state === 'closed') {
+            if (bytesWritten !== 0) {
+                throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream');
+            }
+        }
+        else {
+            if (bytesWritten === 0) {
+                throw new TypeError('bytesWritten must be greater than 0 when calling respond() on a readable stream');
+            }
+            if (firstDescriptor.bytesFilled + bytesWritten > firstDescriptor.byteLength) {
+                throw new RangeError('bytesWritten out of range');
+            }
+        }
+        firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer);
+        ReadableByteStreamControllerRespondInternal(controller, bytesWritten);
+    }
+    function ReadableByteStreamControllerRespondWithNewView(controller, view) {
+        const firstDescriptor = controller._pendingPullIntos.peek();
+        const state = controller._controlledReadableByteStream._state;
+        if (state === 'closed') {
+            if (view.byteLength !== 0) {
+                throw new TypeError('The view\'s length must be 0 when calling respondWithNewView() on a closed stream');
+            }
+        }
+        else {
+            if (view.byteLength === 0) {
+                throw new TypeError('The view\'s length must be greater than 0 when calling respondWithNewView() on a readable stream');
+            }
+        }
+        if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) {
+            throw new RangeError('The region specified by view does not match byobRequest');
+        }
+        if (firstDescriptor.bufferByteLength !== view.buffer.byteLength) {
+            throw new RangeError('The buffer of view has different capacity than byobRequest');
+        }
+        if (firstDescriptor.bytesFilled + view.byteLength > firstDescriptor.byteLength) {
+            throw new RangeError('The region specified by view is larger than byobRequest');
+        }
+        const viewByteLength = view.byteLength;
+        firstDescriptor.buffer = TransferArrayBuffer(view.buffer);
+        ReadableByteStreamControllerRespondInternal(controller, viewByteLength);
+    }
+    function SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize) {
+        controller._controlledReadableByteStream = stream;
+        controller._pullAgain = false;
+        controller._pulling = false;
+        controller._byobRequest = null;
+        // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.
+        controller._queue = controller._queueTotalSize = undefined;
+        ResetQueue(controller);
+        controller._closeRequested = false;
+        controller._started = false;
+        controller._strategyHWM = highWaterMark;
+        controller._pullAlgorithm = pullAlgorithm;
+        controller._cancelAlgorithm = cancelAlgorithm;
+        controller._autoAllocateChunkSize = autoAllocateChunkSize;
+        controller._pendingPullIntos = new SimpleQueue();
+        stream._readableStreamController = controller;
+        const startResult = startAlgorithm();
+        uponPromise(promiseResolvedWith(startResult), () => {
+            controller._started = true;
+            ReadableByteStreamControllerCallPullIfNeeded(controller);
+        }, r => {
+            ReadableByteStreamControllerError(controller, r);
+        });
+    }
+    function SetUpReadableByteStreamControllerFromUnderlyingSource(stream, underlyingByteSource, highWaterMark) {
+        const controller = Object.create(ReadableByteStreamController.prototype);
+        let startAlgorithm = () => undefined;
+        let pullAlgorithm = () => promiseResolvedWith(undefined);
+        let cancelAlgorithm = () => promiseResolvedWith(undefined);
+        if (underlyingByteSource.start !== undefined) {
+            startAlgorithm = () => underlyingByteSource.start(controller);
+        }
+        if (underlyingByteSource.pull !== undefined) {
+            pullAlgorithm = () => underlyingByteSource.pull(controller);
+        }
+        if (underlyingByteSource.cancel !== undefined) {
+            cancelAlgorithm = reason => underlyingByteSource.cancel(reason);
+        }
+        const autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;
+        if (autoAllocateChunkSize === 0) {
+            throw new TypeError('autoAllocateChunkSize must be greater than 0');
+        }
+        SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize);
+    }
+    function SetUpReadableStreamBYOBRequest(request, controller, view) {
+        request._associatedReadableByteStreamController = controller;
+        request._view = view;
+    }
+    // Helper functions for the ReadableStreamBYOBRequest.
+    function byobRequestBrandCheckException(name) {
+        return new TypeError(`ReadableStreamBYOBRequest.prototype.${name} can only be used on a ReadableStreamBYOBRequest`);
+    }
+    // Helper functions for the ReadableByteStreamController.
+    function byteStreamControllerBrandCheckException(name) {
+        return new TypeError(`ReadableByteStreamController.prototype.${name} can only be used on a ReadableByteStreamController`);
+    }
+
+    // Abstract operations for the ReadableStream.
+    function AcquireReadableStreamBYOBReader(stream) {
+        return new ReadableStreamBYOBReader(stream);
+    }
+    // ReadableStream API exposed for controllers.
+    function ReadableStreamAddReadIntoRequest(stream, readIntoRequest) {
+        stream._reader._readIntoRequests.push(readIntoRequest);
+    }
+    function ReadableStreamFulfillReadIntoRequest(stream, chunk, done) {
+        const reader = stream._reader;
+        const readIntoRequest = reader._readIntoRequests.shift();
+        if (done) {
+            readIntoRequest._closeSteps(chunk);
+        }
+        else {
+            readIntoRequest._chunkSteps(chunk);
+        }
+    }
+    function ReadableStreamGetNumReadIntoRequests(stream) {
+        return stream._reader._readIntoRequests.length;
+    }
+    function ReadableStreamHasBYOBReader(stream) {
+        const reader = stream._reader;
+        if (reader === undefined) {
+            return false;
+        }
+        if (!IsReadableStreamBYOBReader(reader)) {
+            return false;
+        }
+        return true;
+    }
+    /**
+     * A BYOB reader vended by a {@link ReadableStream}.
+     *
+     * @public
+     */
+    class ReadableStreamBYOBReader {
+        constructor(stream) {
+            assertRequiredArgument(stream, 1, 'ReadableStreamBYOBReader');
+            assertReadableStream(stream, 'First parameter');
+            if (IsReadableStreamLocked(stream)) {
+                throw new TypeError('This stream has already been locked for exclusive reading by another reader');
+            }
+            if (!IsReadableByteStreamController(stream._readableStreamController)) {
+                throw new TypeError('Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte ' +
+                    'source');
+            }
+            ReadableStreamReaderGenericInitialize(this, stream);
+            this._readIntoRequests = new SimpleQueue();
+        }
+        /**
+         * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or
+         * the reader's lock is released before the stream finishes closing.
+         */
+        get closed() {
+            if (!IsReadableStreamBYOBReader(this)) {
+                return promiseRejectedWith(byobReaderBrandCheckException('closed'));
+            }
+            return this._closedPromise;
+        }
+        /**
+         * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.
+         */
+        cancel(reason = undefined) {
+            if (!IsReadableStreamBYOBReader(this)) {
+                return promiseRejectedWith(byobReaderBrandCheckException('cancel'));
+            }
+            if (this._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('cancel'));
+            }
+            return ReadableStreamReaderGenericCancel(this, reason);
+        }
+        /**
+         * Attempts to reads bytes into view, and returns a promise resolved with the result.
+         *
+         * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.
+         */
+        read(view) {
+            if (!IsReadableStreamBYOBReader(this)) {
+                return promiseRejectedWith(byobReaderBrandCheckException('read'));
+            }
+            if (!ArrayBuffer.isView(view)) {
+                return promiseRejectedWith(new TypeError('view must be an array buffer view'));
+            }
+            if (view.byteLength === 0) {
+                return promiseRejectedWith(new TypeError('view must have non-zero byteLength'));
+            }
+            if (view.buffer.byteLength === 0) {
+                return promiseRejectedWith(new TypeError(`view's buffer must have non-zero byteLength`));
+            }
+            if (IsDetachedBuffer(view.buffer)) ;
+            if (this._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('read from'));
+            }
+            let resolvePromise;
+            let rejectPromise;
+            const promise = newPromise((resolve, reject) => {
+                resolvePromise = resolve;
+                rejectPromise = reject;
+            });
+            const readIntoRequest = {
+                _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),
+                _closeSteps: chunk => resolvePromise({ value: chunk, done: true }),
+                _errorSteps: e => rejectPromise(e)
+            };
+            ReadableStreamBYOBReaderRead(this, view, readIntoRequest);
+            return promise;
+        }
+        /**
+         * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.
+         * If the associated stream is errored when the lock is released, the reader will appear errored in the same way
+         * from now on; otherwise, the reader will appear closed.
+         *
+         * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by
+         * the reader's {@link ReadableStreamBYOBReader.read | read()} method has not yet been settled. Attempting to
+         * do so will throw a `TypeError` and leave the reader locked to the stream.
+         */
+        releaseLock() {
+            if (!IsReadableStreamBYOBReader(this)) {
+                throw byobReaderBrandCheckException('releaseLock');
+            }
+            if (this._ownerReadableStream === undefined) {
+                return;
+            }
+            if (this._readIntoRequests.length > 0) {
+                throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');
+            }
+            ReadableStreamReaderGenericRelease(this);
+        }
+    }
+    Object.defineProperties(ReadableStreamBYOBReader.prototype, {
+        cancel: { enumerable: true },
+        read: { enumerable: true },
+        releaseLock: { enumerable: true },
+        closed: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableStreamBYOBReader.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableStreamBYOBReader',
+            configurable: true
+        });
+    }
+    // Abstract operations for the readers.
+    function IsReadableStreamBYOBReader(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_readIntoRequests')) {
+            return false;
+        }
+        return x instanceof ReadableStreamBYOBReader;
+    }
+    function ReadableStreamBYOBReaderRead(reader, view, readIntoRequest) {
+        const stream = reader._ownerReadableStream;
+        stream._disturbed = true;
+        if (stream._state === 'errored') {
+            readIntoRequest._errorSteps(stream._storedError);
+        }
+        else {
+            ReadableByteStreamControllerPullInto(stream._readableStreamController, view, readIntoRequest);
+        }
+    }
+    // Helper functions for the ReadableStreamBYOBReader.
+    function byobReaderBrandCheckException(name) {
+        return new TypeError(`ReadableStreamBYOBReader.prototype.${name} can only be used on a ReadableStreamBYOBReader`);
+    }
+
+    function ExtractHighWaterMark(strategy, defaultHWM) {
+        const { highWaterMark } = strategy;
+        if (highWaterMark === undefined) {
+            return defaultHWM;
+        }
+        if (NumberIsNaN(highWaterMark) || highWaterMark < 0) {
+            throw new RangeError('Invalid highWaterMark');
+        }
+        return highWaterMark;
+    }
+    function ExtractSizeAlgorithm(strategy) {
+        const { size } = strategy;
+        if (!size) {
+            return () => 1;
+        }
+        return size;
+    }
+
+    function convertQueuingStrategy(init, context) {
+        assertDictionary(init, context);
+        const highWaterMark = init === null || init === void 0 ? void 0 : init.highWaterMark;
+        const size = init === null || init === void 0 ? void 0 : init.size;
+        return {
+            highWaterMark: highWaterMark === undefined ? undefined : convertUnrestrictedDouble(highWaterMark),
+            size: size === undefined ? undefined : convertQueuingStrategySize(size, `${context} has member 'size' that`)
+        };
+    }
+    function convertQueuingStrategySize(fn, context) {
+        assertFunction(fn, context);
+        return chunk => convertUnrestrictedDouble(fn(chunk));
+    }
+
+    function convertUnderlyingSink(original, context) {
+        assertDictionary(original, context);
+        const abort = original === null || original === void 0 ? void 0 : original.abort;
+        const close = original === null || original === void 0 ? void 0 : original.close;
+        const start = original === null || original === void 0 ? void 0 : original.start;
+        const type = original === null || original === void 0 ? void 0 : original.type;
+        const write = original === null || original === void 0 ? void 0 : original.write;
+        return {
+            abort: abort === undefined ?
+                undefined :
+                convertUnderlyingSinkAbortCallback(abort, original, `${context} has member 'abort' that`),
+            close: close === undefined ?
+                undefined :
+                convertUnderlyingSinkCloseCallback(close, original, `${context} has member 'close' that`),
+            start: start === undefined ?
+                undefined :
+                convertUnderlyingSinkStartCallback(start, original, `${context} has member 'start' that`),
+            write: write === undefined ?
+                undefined :
+                convertUnderlyingSinkWriteCallback(write, original, `${context} has member 'write' that`),
+            type
+        };
+    }
+    function convertUnderlyingSinkAbortCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (reason) => promiseCall(fn, original, [reason]);
+    }
+    function convertUnderlyingSinkCloseCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return () => promiseCall(fn, original, []);
+    }
+    function convertUnderlyingSinkStartCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (controller) => reflectCall(fn, original, [controller]);
+    }
+    function convertUnderlyingSinkWriteCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (chunk, controller) => promiseCall(fn, original, [chunk, controller]);
+    }
+
+    function assertWritableStream(x, context) {
+        if (!IsWritableStream(x)) {
+            throw new TypeError(`${context} is not a WritableStream.`);
+        }
+    }
+
+    function isAbortSignal(value) {
+        if (typeof value !== 'object' || value === null) {
+            return false;
+        }
+        try {
+            return typeof value.aborted === 'boolean';
+        }
+        catch (_a) {
+            // AbortSignal.prototype.aborted throws if its brand check fails
+            return false;
+        }
+    }
+    const supportsAbortController = typeof AbortController === 'function';
+    /**
+     * Construct a new AbortController, if supported by the platform.
+     *
+     * @internal
+     */
+    function createAbortController() {
+        if (supportsAbortController) {
+            return new AbortController();
+        }
+        return undefined;
+    }
+
+    /**
+     * A writable stream represents a destination for data, into which you can write.
+     *
+     * @public
+     */
+    class WritableStream {
+        constructor(rawUnderlyingSink = {}, rawStrategy = {}) {
+            if (rawUnderlyingSink === undefined) {
+                rawUnderlyingSink = null;
+            }
+            else {
+                assertObject(rawUnderlyingSink, 'First parameter');
+            }
+            const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');
+            const underlyingSink = convertUnderlyingSink(rawUnderlyingSink, 'First parameter');
+            InitializeWritableStream(this);
+            const type = underlyingSink.type;
+            if (type !== undefined) {
+                throw new RangeError('Invalid type is specified');
+            }
+            const sizeAlgorithm = ExtractSizeAlgorithm(strategy);
+            const highWaterMark = ExtractHighWaterMark(strategy, 1);
+            SetUpWritableStreamDefaultControllerFromUnderlyingSink(this, underlyingSink, highWaterMark, sizeAlgorithm);
+        }
+        /**
+         * Returns whether or not the writable stream is locked to a writer.
+         */
+        get locked() {
+            if (!IsWritableStream(this)) {
+                throw streamBrandCheckException$2('locked');
+            }
+            return IsWritableStreamLocked(this);
+        }
+        /**
+         * Aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be
+         * immediately moved to an errored state, with any queued-up writes discarded. This will also execute any abort
+         * mechanism of the underlying sink.
+         *
+         * The returned promise will fulfill if the stream shuts down successfully, or reject if the underlying sink signaled
+         * that there was an error doing so. Additionally, it will reject with a `TypeError` (without attempting to cancel
+         * the stream) if the stream is currently locked.
+         */
+        abort(reason = undefined) {
+            if (!IsWritableStream(this)) {
+                return promiseRejectedWith(streamBrandCheckException$2('abort'));
+            }
+            if (IsWritableStreamLocked(this)) {
+                return promiseRejectedWith(new TypeError('Cannot abort a stream that already has a writer'));
+            }
+            return WritableStreamAbort(this, reason);
+        }
+        /**
+         * Closes the stream. The underlying sink will finish processing any previously-written chunks, before invoking its
+         * close behavior. During this time any further attempts to write will fail (without erroring the stream).
+         *
+         * The method returns a promise that will fulfill if all remaining chunks are successfully written and the stream
+         * successfully closes, or rejects if an error is encountered during this process. Additionally, it will reject with
+         * a `TypeError` (without attempting to cancel the stream) if the stream is currently locked.
+         */
+        close() {
+            if (!IsWritableStream(this)) {
+                return promiseRejectedWith(streamBrandCheckException$2('close'));
+            }
+            if (IsWritableStreamLocked(this)) {
+                return promiseRejectedWith(new TypeError('Cannot close a stream that already has a writer'));
+            }
+            if (WritableStreamCloseQueuedOrInFlight(this)) {
+                return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));
+            }
+            return WritableStreamClose(this);
+        }
+        /**
+         * Creates a {@link WritableStreamDefaultWriter | writer} and locks the stream to the new writer. While the stream
+         * is locked, no other writer can be acquired until this one is released.
+         *
+         * This functionality is especially useful for creating abstractions that desire the ability to write to a stream
+         * without interruption or interleaving. By getting a writer for the stream, you can ensure nobody else can write at
+         * the same time, which would cause the resulting written data to be unpredictable and probably useless.
+         */
+        getWriter() {
+            if (!IsWritableStream(this)) {
+                throw streamBrandCheckException$2('getWriter');
+            }
+            return AcquireWritableStreamDefaultWriter(this);
+        }
+    }
+    Object.defineProperties(WritableStream.prototype, {
+        abort: { enumerable: true },
+        close: { enumerable: true },
+        getWriter: { enumerable: true },
+        locked: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(WritableStream.prototype, SymbolPolyfill.toStringTag, {
+            value: 'WritableStream',
+            configurable: true
+        });
+    }
+    // Abstract operations for the WritableStream.
+    function AcquireWritableStreamDefaultWriter(stream) {
+        return new WritableStreamDefaultWriter(stream);
+    }
+    // Throws if and only if startAlgorithm throws.
+    function CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark = 1, sizeAlgorithm = () => 1) {
+        const stream = Object.create(WritableStream.prototype);
+        InitializeWritableStream(stream);
+        const controller = Object.create(WritableStreamDefaultController.prototype);
+        SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm);
+        return stream;
+    }
+    function InitializeWritableStream(stream) {
+        stream._state = 'writable';
+        // The error that will be reported by new method calls once the state becomes errored. Only set when [[state]] is
+        // 'erroring' or 'errored'. May be set to an undefined value.
+        stream._storedError = undefined;
+        stream._writer = undefined;
+        // Initialize to undefined first because the constructor of the controller checks this
+        // variable to validate the caller.
+        stream._writableStreamController = undefined;
+        // This queue is placed here instead of the writer class in order to allow for passing a writer to the next data
+        // producer without waiting for the queued writes to finish.
+        stream._writeRequests = new SimpleQueue();
+        // Write requests are removed from _writeRequests when write() is called on the underlying sink. This prevents
+        // them from being erroneously rejected on error. If a write() call is in-flight, the request is stored here.
+        stream._inFlightWriteRequest = undefined;
+        // The promise that was returned from writer.close(). Stored here because it may be fulfilled after the writer
+        // has been detached.
+        stream._closeRequest = undefined;
+        // Close request is removed from _closeRequest when close() is called on the underlying sink. This prevents it
+        // from being erroneously rejected on error. If a close() call is in-flight, the request is stored here.
+        stream._inFlightCloseRequest = undefined;
+        // The promise that was returned from writer.abort(). This may also be fulfilled after the writer has detached.
+        stream._pendingAbortRequest = undefined;
+        // The backpressure signal set by the controller.
+        stream._backpressure = false;
+    }
+    function IsWritableStream(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_writableStreamController')) {
+            return false;
+        }
+        return x instanceof WritableStream;
+    }
+    function IsWritableStreamLocked(stream) {
+        if (stream._writer === undefined) {
+            return false;
+        }
+        return true;
+    }
+    function WritableStreamAbort(stream, reason) {
+        var _a;
+        if (stream._state === 'closed' || stream._state === 'errored') {
+            return promiseResolvedWith(undefined);
+        }
+        stream._writableStreamController._abortReason = reason;
+        (_a = stream._writableStreamController._abortController) === null || _a === void 0 ? void 0 : _a.abort();
+        // TypeScript narrows the type of `stream._state` down to 'writable' | 'erroring',
+        // but it doesn't know that signaling abort runs author code that might have changed the state.
+        // Widen the type again by casting to WritableStreamState.
+        const state = stream._state;
+        if (state === 'closed' || state === 'errored') {
+            return promiseResolvedWith(undefined);
+        }
+        if (stream._pendingAbortRequest !== undefined) {
+            return stream._pendingAbortRequest._promise;
+        }
+        let wasAlreadyErroring = false;
+        if (state === 'erroring') {
+            wasAlreadyErroring = true;
+            // reason will not be used, so don't keep a reference to it.
+            reason = undefined;
+        }
+        const promise = newPromise((resolve, reject) => {
+            stream._pendingAbortRequest = {
+                _promise: undefined,
+                _resolve: resolve,
+                _reject: reject,
+                _reason: reason,
+                _wasAlreadyErroring: wasAlreadyErroring
+            };
+        });
+        stream._pendingAbortRequest._promise = promise;
+        if (!wasAlreadyErroring) {
+            WritableStreamStartErroring(stream, reason);
+        }
+        return promise;
+    }
+    function WritableStreamClose(stream) {
+        const state = stream._state;
+        if (state === 'closed' || state === 'errored') {
+            return promiseRejectedWith(new TypeError(`The stream (in ${state} state) is not in the writable state and cannot be closed`));
+        }
+        const promise = newPromise((resolve, reject) => {
+            const closeRequest = {
+                _resolve: resolve,
+                _reject: reject
+            };
+            stream._closeRequest = closeRequest;
+        });
+        const writer = stream._writer;
+        if (writer !== undefined && stream._backpressure && state === 'writable') {
+            defaultWriterReadyPromiseResolve(writer);
+        }
+        WritableStreamDefaultControllerClose(stream._writableStreamController);
+        return promise;
+    }
+    // WritableStream API exposed for controllers.
+    function WritableStreamAddWriteRequest(stream) {
+        const promise = newPromise((resolve, reject) => {
+            const writeRequest = {
+                _resolve: resolve,
+                _reject: reject
+            };
+            stream._writeRequests.push(writeRequest);
+        });
+        return promise;
+    }
+    function WritableStreamDealWithRejection(stream, error) {
+        const state = stream._state;
+        if (state === 'writable') {
+            WritableStreamStartErroring(stream, error);
+            return;
+        }
+        WritableStreamFinishErroring(stream);
+    }
+    function WritableStreamStartErroring(stream, reason) {
+        const controller = stream._writableStreamController;
+        stream._state = 'erroring';
+        stream._storedError = reason;
+        const writer = stream._writer;
+        if (writer !== undefined) {
+            WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);
+        }
+        if (!WritableStreamHasOperationMarkedInFlight(stream) && controller._started) {
+            WritableStreamFinishErroring(stream);
+        }
+    }
+    function WritableStreamFinishErroring(stream) {
+        stream._state = 'errored';
+        stream._writableStreamController[ErrorSteps]();
+        const storedError = stream._storedError;
+        stream._writeRequests.forEach(writeRequest => {
+            writeRequest._reject(storedError);
+        });
+        stream._writeRequests = new SimpleQueue();
+        if (stream._pendingAbortRequest === undefined) {
+            WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+            return;
+        }
+        const abortRequest = stream._pendingAbortRequest;
+        stream._pendingAbortRequest = undefined;
+        if (abortRequest._wasAlreadyErroring) {
+            abortRequest._reject(storedError);
+            WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+            return;
+        }
+        const promise = stream._writableStreamController[AbortSteps](abortRequest._reason);
+        uponPromise(promise, () => {
+            abortRequest._resolve();
+            WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+        }, (reason) => {
+            abortRequest._reject(reason);
+            WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+        });
+    }
+    function WritableStreamFinishInFlightWrite(stream) {
+        stream._inFlightWriteRequest._resolve(undefined);
+        stream._inFlightWriteRequest = undefined;
+    }
+    function WritableStreamFinishInFlightWriteWithError(stream, error) {
+        stream._inFlightWriteRequest._reject(error);
+        stream._inFlightWriteRequest = undefined;
+        WritableStreamDealWithRejection(stream, error);
+    }
+    function WritableStreamFinishInFlightClose(stream) {
+        stream._inFlightCloseRequest._resolve(undefined);
+        stream._inFlightCloseRequest = undefined;
+        const state = stream._state;
+        if (state === 'erroring') {
+            // The error was too late to do anything, so it is ignored.
+            stream._storedError = undefined;
+            if (stream._pendingAbortRequest !== undefined) {
+                stream._pendingAbortRequest._resolve();
+                stream._pendingAbortRequest = undefined;
+            }
+        }
+        stream._state = 'closed';
+        const writer = stream._writer;
+        if (writer !== undefined) {
+            defaultWriterClosedPromiseResolve(writer);
+        }
+    }
+    function WritableStreamFinishInFlightCloseWithError(stream, error) {
+        stream._inFlightCloseRequest._reject(error);
+        stream._inFlightCloseRequest = undefined;
+        // Never execute sink abort() after sink close().
+        if (stream._pendingAbortRequest !== undefined) {
+            stream._pendingAbortRequest._reject(error);
+            stream._pendingAbortRequest = undefined;
+        }
+        WritableStreamDealWithRejection(stream, error);
+    }
+    // TODO(ricea): Fix alphabetical order.
+    function WritableStreamCloseQueuedOrInFlight(stream) {
+        if (stream._closeRequest === undefined && stream._inFlightCloseRequest === undefined) {
+            return false;
+        }
+        return true;
+    }
+    function WritableStreamHasOperationMarkedInFlight(stream) {
+        if (stream._inFlightWriteRequest === undefined && stream._inFlightCloseRequest === undefined) {
+            return false;
+        }
+        return true;
+    }
+    function WritableStreamMarkCloseRequestInFlight(stream) {
+        stream._inFlightCloseRequest = stream._closeRequest;
+        stream._closeRequest = undefined;
+    }
+    function WritableStreamMarkFirstWriteRequestInFlight(stream) {
+        stream._inFlightWriteRequest = stream._writeRequests.shift();
+    }
+    function WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream) {
+        if (stream._closeRequest !== undefined) {
+            stream._closeRequest._reject(stream._storedError);
+            stream._closeRequest = undefined;
+        }
+        const writer = stream._writer;
+        if (writer !== undefined) {
+            defaultWriterClosedPromiseReject(writer, stream._storedError);
+        }
+    }
+    function WritableStreamUpdateBackpressure(stream, backpressure) {
+        const writer = stream._writer;
+        if (writer !== undefined && backpressure !== stream._backpressure) {
+            if (backpressure) {
+                defaultWriterReadyPromiseReset(writer);
+            }
+            else {
+                defaultWriterReadyPromiseResolve(writer);
+            }
+        }
+        stream._backpressure = backpressure;
+    }
+    /**
+     * A default writer vended by a {@link WritableStream}.
+     *
+     * @public
+     */
+    class WritableStreamDefaultWriter {
+        constructor(stream) {
+            assertRequiredArgument(stream, 1, 'WritableStreamDefaultWriter');
+            assertWritableStream(stream, 'First parameter');
+            if (IsWritableStreamLocked(stream)) {
+                throw new TypeError('This stream has already been locked for exclusive writing by another writer');
+            }
+            this._ownerWritableStream = stream;
+            stream._writer = this;
+            const state = stream._state;
+            if (state === 'writable') {
+                if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._backpressure) {
+                    defaultWriterReadyPromiseInitialize(this);
+                }
+                else {
+                    defaultWriterReadyPromiseInitializeAsResolved(this);
+                }
+                defaultWriterClosedPromiseInitialize(this);
+            }
+            else if (state === 'erroring') {
+                defaultWriterReadyPromiseInitializeAsRejected(this, stream._storedError);
+                defaultWriterClosedPromiseInitialize(this);
+            }
+            else if (state === 'closed') {
+                defaultWriterReadyPromiseInitializeAsResolved(this);
+                defaultWriterClosedPromiseInitializeAsResolved(this);
+            }
+            else {
+                const storedError = stream._storedError;
+                defaultWriterReadyPromiseInitializeAsRejected(this, storedError);
+                defaultWriterClosedPromiseInitializeAsRejected(this, storedError);
+            }
+        }
+        /**
+         * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or
+         * the writer’s lock is released before the stream finishes closing.
+         */
+        get closed() {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                return promiseRejectedWith(defaultWriterBrandCheckException('closed'));
+            }
+            return this._closedPromise;
+        }
+        /**
+         * Returns the desired size to fill the stream’s internal queue. It can be negative, if the queue is over-full.
+         * A producer can use this information to determine the right amount of data to write.
+         *
+         * It will be `null` if the stream cannot be successfully written to (due to either being errored, or having an abort
+         * queued up). It will return zero if the stream is closed. And the getter will throw an exception if invoked when
+         * the writer’s lock is released.
+         */
+        get desiredSize() {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                throw defaultWriterBrandCheckException('desiredSize');
+            }
+            if (this._ownerWritableStream === undefined) {
+                throw defaultWriterLockException('desiredSize');
+            }
+            return WritableStreamDefaultWriterGetDesiredSize(this);
+        }
+        /**
+         * Returns a promise that will be fulfilled when the desired size to fill the stream’s internal queue transitions
+         * from non-positive to positive, signaling that it is no longer applying backpressure. Once the desired size dips
+         * back to zero or below, the getter will return a new promise that stays pending until the next transition.
+         *
+         * If the stream becomes errored or aborted, or the writer’s lock is released, the returned promise will become
+         * rejected.
+         */
+        get ready() {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                return promiseRejectedWith(defaultWriterBrandCheckException('ready'));
+            }
+            return this._readyPromise;
+        }
+        /**
+         * If the reader is active, behaves the same as {@link WritableStream.abort | stream.abort(reason)}.
+         */
+        abort(reason = undefined) {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                return promiseRejectedWith(defaultWriterBrandCheckException('abort'));
+            }
+            if (this._ownerWritableStream === undefined) {
+                return promiseRejectedWith(defaultWriterLockException('abort'));
+            }
+            return WritableStreamDefaultWriterAbort(this, reason);
+        }
+        /**
+         * If the reader is active, behaves the same as {@link WritableStream.close | stream.close()}.
+         */
+        close() {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                return promiseRejectedWith(defaultWriterBrandCheckException('close'));
+            }
+            const stream = this._ownerWritableStream;
+            if (stream === undefined) {
+                return promiseRejectedWith(defaultWriterLockException('close'));
+            }
+            if (WritableStreamCloseQueuedOrInFlight(stream)) {
+                return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));
+            }
+            return WritableStreamDefaultWriterClose(this);
+        }
+        /**
+         * Releases the writer’s lock on the corresponding stream. After the lock is released, the writer is no longer active.
+         * If the associated stream is errored when the lock is released, the writer will appear errored in the same way from
+         * now on; otherwise, the writer will appear closed.
+         *
+         * Note that the lock can still be released even if some ongoing writes have not yet finished (i.e. even if the
+         * promises returned from previous calls to {@link WritableStreamDefaultWriter.write | write()} have not yet settled).
+         * It’s not necessary to hold the lock on the writer for the duration of the write; the lock instead simply prevents
+         * other producers from writing in an interleaved manner.
+         */
+        releaseLock() {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                throw defaultWriterBrandCheckException('releaseLock');
+            }
+            const stream = this._ownerWritableStream;
+            if (stream === undefined) {
+                return;
+            }
+            WritableStreamDefaultWriterRelease(this);
+        }
+        write(chunk = undefined) {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                return promiseRejectedWith(defaultWriterBrandCheckException('write'));
+            }
+            if (this._ownerWritableStream === undefined) {
+                return promiseRejectedWith(defaultWriterLockException('write to'));
+            }
+            return WritableStreamDefaultWriterWrite(this, chunk);
+        }
+    }
+    Object.defineProperties(WritableStreamDefaultWriter.prototype, {
+        abort: { enumerable: true },
+        close: { enumerable: true },
+        releaseLock: { enumerable: true },
+        write: { enumerable: true },
+        closed: { enumerable: true },
+        desiredSize: { enumerable: true },
+        ready: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(WritableStreamDefaultWriter.prototype, SymbolPolyfill.toStringTag, {
+            value: 'WritableStreamDefaultWriter',
+            configurable: true
+        });
+    }
+    // Abstract operations for the WritableStreamDefaultWriter.
+    function IsWritableStreamDefaultWriter(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) {
+            return false;
+        }
+        return x instanceof WritableStreamDefaultWriter;
+    }
+    // A client of WritableStreamDefaultWriter may use these functions directly to bypass state check.
+    function WritableStreamDefaultWriterAbort(writer, reason) {
+        const stream = writer._ownerWritableStream;
+        return WritableStreamAbort(stream, reason);
+    }
+    function WritableStreamDefaultWriterClose(writer) {
+        const stream = writer._ownerWritableStream;
+        return WritableStreamClose(stream);
+    }
+    function WritableStreamDefaultWriterCloseWithErrorPropagation(writer) {
+        const stream = writer._ownerWritableStream;
+        const state = stream._state;
+        if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {
+            return promiseResolvedWith(undefined);
+        }
+        if (state === 'errored') {
+            return promiseRejectedWith(stream._storedError);
+        }
+        return WritableStreamDefaultWriterClose(writer);
+    }
+    function WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, error) {
+        if (writer._closedPromiseState === 'pending') {
+            defaultWriterClosedPromiseReject(writer, error);
+        }
+        else {
+            defaultWriterClosedPromiseResetToRejected(writer, error);
+        }
+    }
+    function WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, error) {
+        if (writer._readyPromiseState === 'pending') {
+            defaultWriterReadyPromiseReject(writer, error);
+        }
+        else {
+            defaultWriterReadyPromiseResetToRejected(writer, error);
+        }
+    }
+    function WritableStreamDefaultWriterGetDesiredSize(writer) {
+        const stream = writer._ownerWritableStream;
+        const state = stream._state;
+        if (state === 'errored' || state === 'erroring') {
+            return null;
+        }
+        if (state === 'closed') {
+            return 0;
+        }
+        return WritableStreamDefaultControllerGetDesiredSize(stream._writableStreamController);
+    }
+    function WritableStreamDefaultWriterRelease(writer) {
+        const stream = writer._ownerWritableStream;
+        const releasedError = new TypeError(`Writer was released and can no longer be used to monitor the stream's closedness`);
+        WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, releasedError);
+        // The state transitions to "errored" before the sink abort() method runs, but the writer.closed promise is not
+        // rejected until afterwards. This means that simply testing state will not work.
+        WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, releasedError);
+        stream._writer = undefined;
+        writer._ownerWritableStream = undefined;
+    }
+    function WritableStreamDefaultWriterWrite(writer, chunk) {
+        const stream = writer._ownerWritableStream;
+        const controller = stream._writableStreamController;
+        const chunkSize = WritableStreamDefaultControllerGetChunkSize(controller, chunk);
+        if (stream !== writer._ownerWritableStream) {
+            return promiseRejectedWith(defaultWriterLockException('write to'));
+        }
+        const state = stream._state;
+        if (state === 'errored') {
+            return promiseRejectedWith(stream._storedError);
+        }
+        if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {
+            return promiseRejectedWith(new TypeError('The stream is closing or closed and cannot be written to'));
+        }
+        if (state === 'erroring') {
+            return promiseRejectedWith(stream._storedError);
+        }
+        const promise = WritableStreamAddWriteRequest(stream);
+        WritableStreamDefaultControllerWrite(controller, chunk, chunkSize);
+        return promise;
+    }
+    const closeSentinel = {};
+    /**
+     * Allows control of a {@link WritableStream | writable stream}'s state and internal queue.
+     *
+     * @public
+     */
+    class WritableStreamDefaultController {
+        constructor() {
+            throw new TypeError('Illegal constructor');
+        }
+        /**
+         * The reason which was passed to `WritableStream.abort(reason)` when the stream was aborted.
+         *
+         * @deprecated
+         *  This property has been removed from the specification, see https://github.com/whatwg/streams/pull/1177.
+         *  Use {@link WritableStreamDefaultController.signal}'s `reason` instead.
+         */
+        get abortReason() {
+            if (!IsWritableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$2('abortReason');
+            }
+            return this._abortReason;
+        }
+        /**
+         * An `AbortSignal` that can be used to abort the pending write or close operation when the stream is aborted.
+         */
+        get signal() {
+            if (!IsWritableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$2('signal');
+            }
+            if (this._abortController === undefined) {
+                // Older browsers or older Node versions may not support `AbortController` or `AbortSignal`.
+                // We don't want to bundle and ship an `AbortController` polyfill together with our polyfill,
+                // so instead we only implement support for `signal` if we find a global `AbortController` constructor.
+                throw new TypeError('WritableStreamDefaultController.prototype.signal is not supported');
+            }
+            return this._abortController.signal;
+        }
+        /**
+         * Closes the controlled writable stream, making all future interactions with it fail with the given error `e`.
+         *
+         * This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying
+         * sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the
+         * normal lifecycle of interactions with the underlying sink.
+         */
+        error(e = undefined) {
+            if (!IsWritableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$2('error');
+            }
+            const state = this._controlledWritableStream._state;
+            if (state !== 'writable') {
+                // The stream is closed, errored or will be soon. The sink can't do anything useful if it gets an error here, so
+                // just treat it as a no-op.
+                return;
+            }
+            WritableStreamDefaultControllerError(this, e);
+        }
+        /** @internal */
+        [AbortSteps](reason) {
+            const result = this._abortAlgorithm(reason);
+            WritableStreamDefaultControllerClearAlgorithms(this);
+            return result;
+        }
+        /** @internal */
+        [ErrorSteps]() {
+            ResetQueue(this);
+        }
+    }
+    Object.defineProperties(WritableStreamDefaultController.prototype, {
+        abortReason: { enumerable: true },
+        signal: { enumerable: true },
+        error: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(WritableStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+            value: 'WritableStreamDefaultController',
+            configurable: true
+        });
+    }
+    // Abstract operations implementing interface required by the WritableStream.
+    function IsWritableStreamDefaultController(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_controlledWritableStream')) {
+            return false;
+        }
+        return x instanceof WritableStreamDefaultController;
+    }
+    function SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm) {
+        controller._controlledWritableStream = stream;
+        stream._writableStreamController = controller;
+        // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.
+        controller._queue = undefined;
+        controller._queueTotalSize = undefined;
+        ResetQueue(controller);
+        controller._abortReason = undefined;
+        controller._abortController = createAbortController();
+        controller._started = false;
+        controller._strategySizeAlgorithm = sizeAlgorithm;
+        controller._strategyHWM = highWaterMark;
+        controller._writeAlgorithm = writeAlgorithm;
+        controller._closeAlgorithm = closeAlgorithm;
+        controller._abortAlgorithm = abortAlgorithm;
+        const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+        WritableStreamUpdateBackpressure(stream, backpressure);
+        const startResult = startAlgorithm();
+        const startPromise = promiseResolvedWith(startResult);
+        uponPromise(startPromise, () => {
+            controller._started = true;
+            WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+        }, r => {
+            controller._started = true;
+            WritableStreamDealWithRejection(stream, r);
+        });
+    }
+    function SetUpWritableStreamDefaultControllerFromUnderlyingSink(stream, underlyingSink, highWaterMark, sizeAlgorithm) {
+        const controller = Object.create(WritableStreamDefaultController.prototype);
+        let startAlgorithm = () => undefined;
+        let writeAlgorithm = () => promiseResolvedWith(undefined);
+        let closeAlgorithm = () => promiseResolvedWith(undefined);
+        let abortAlgorithm = () => promiseResolvedWith(undefined);
+        if (underlyingSink.start !== undefined) {
+            startAlgorithm = () => underlyingSink.start(controller);
+        }
+        if (underlyingSink.write !== undefined) {
+            writeAlgorithm = chunk => underlyingSink.write(chunk, controller);
+        }
+        if (underlyingSink.close !== undefined) {
+            closeAlgorithm = () => underlyingSink.close();
+        }
+        if (underlyingSink.abort !== undefined) {
+            abortAlgorithm = reason => underlyingSink.abort(reason);
+        }
+        SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm);
+    }
+    // ClearAlgorithms may be called twice. Erroring the same stream in multiple ways will often result in redundant calls.
+    function WritableStreamDefaultControllerClearAlgorithms(controller) {
+        controller._writeAlgorithm = undefined;
+        controller._closeAlgorithm = undefined;
+        controller._abortAlgorithm = undefined;
+        controller._strategySizeAlgorithm = undefined;
+    }
+    function WritableStreamDefaultControllerClose(controller) {
+        EnqueueValueWithSize(controller, closeSentinel, 0);
+        WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+    }
+    function WritableStreamDefaultControllerGetChunkSize(controller, chunk) {
+        try {
+            return controller._strategySizeAlgorithm(chunk);
+        }
+        catch (chunkSizeE) {
+            WritableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE);
+            return 1;
+        }
+    }
+    function WritableStreamDefaultControllerGetDesiredSize(controller) {
+        return controller._strategyHWM - controller._queueTotalSize;
+    }
+    function WritableStreamDefaultControllerWrite(controller, chunk, chunkSize) {
+        try {
+            EnqueueValueWithSize(controller, chunk, chunkSize);
+        }
+        catch (enqueueE) {
+            WritableStreamDefaultControllerErrorIfNeeded(controller, enqueueE);
+            return;
+        }
+        const stream = controller._controlledWritableStream;
+        if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._state === 'writable') {
+            const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+            WritableStreamUpdateBackpressure(stream, backpressure);
+        }
+        WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+    }
+    // Abstract operations for the WritableStreamDefaultController.
+    function WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller) {
+        const stream = controller._controlledWritableStream;
+        if (!controller._started) {
+            return;
+        }
+        if (stream._inFlightWriteRequest !== undefined) {
+            return;
+        }
+        const state = stream._state;
+        if (state === 'erroring') {
+            WritableStreamFinishErroring(stream);
+            return;
+        }
+        if (controller._queue.length === 0) {
+            return;
+        }
+        const value = PeekQueueValue(controller);
+        if (value === closeSentinel) {
+            WritableStreamDefaultControllerProcessClose(controller);
+        }
+        else {
+            WritableStreamDefaultControllerProcessWrite(controller, value);
+        }
+    }
+    function WritableStreamDefaultControllerErrorIfNeeded(controller, error) {
+        if (controller._controlledWritableStream._state === 'writable') {
+            WritableStreamDefaultControllerError(controller, error);
+        }
+    }
+    function WritableStreamDefaultControllerProcessClose(controller) {
+        const stream = controller._controlledWritableStream;
+        WritableStreamMarkCloseRequestInFlight(stream);
+        DequeueValue(controller);
+        const sinkClosePromise = controller._closeAlgorithm();
+        WritableStreamDefaultControllerClearAlgorithms(controller);
+        uponPromise(sinkClosePromise, () => {
+            WritableStreamFinishInFlightClose(stream);
+        }, reason => {
+            WritableStreamFinishInFlightCloseWithError(stream, reason);
+        });
+    }
+    function WritableStreamDefaultControllerProcessWrite(controller, chunk) {
+        const stream = controller._controlledWritableStream;
+        WritableStreamMarkFirstWriteRequestInFlight(stream);
+        const sinkWritePromise = controller._writeAlgorithm(chunk);
+        uponPromise(sinkWritePromise, () => {
+            WritableStreamFinishInFlightWrite(stream);
+            const state = stream._state;
+            DequeueValue(controller);
+            if (!WritableStreamCloseQueuedOrInFlight(stream) && state === 'writable') {
+                const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+                WritableStreamUpdateBackpressure(stream, backpressure);
+            }
+            WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+        }, reason => {
+            if (stream._state === 'writable') {
+                WritableStreamDefaultControllerClearAlgorithms(controller);
+            }
+            WritableStreamFinishInFlightWriteWithError(stream, reason);
+        });
+    }
+    function WritableStreamDefaultControllerGetBackpressure(controller) {
+        const desiredSize = WritableStreamDefaultControllerGetDesiredSize(controller);
+        return desiredSize <= 0;
+    }
+    // A client of WritableStreamDefaultController may use these functions directly to bypass state check.
+    function WritableStreamDefaultControllerError(controller, error) {
+        const stream = controller._controlledWritableStream;
+        WritableStreamDefaultControllerClearAlgorithms(controller);
+        WritableStreamStartErroring(stream, error);
+    }
+    // Helper functions for the WritableStream.
+    function streamBrandCheckException$2(name) {
+        return new TypeError(`WritableStream.prototype.${name} can only be used on a WritableStream`);
+    }
+    // Helper functions for the WritableStreamDefaultController.
+    function defaultControllerBrandCheckException$2(name) {
+        return new TypeError(`WritableStreamDefaultController.prototype.${name} can only be used on a WritableStreamDefaultController`);
+    }
+    // Helper functions for the WritableStreamDefaultWriter.
+    function defaultWriterBrandCheckException(name) {
+        return new TypeError(`WritableStreamDefaultWriter.prototype.${name} can only be used on a WritableStreamDefaultWriter`);
+    }
+    function defaultWriterLockException(name) {
+        return new TypeError('Cannot ' + name + ' a stream using a released writer');
+    }
+    function defaultWriterClosedPromiseInitialize(writer) {
+        writer._closedPromise = newPromise((resolve, reject) => {
+            writer._closedPromise_resolve = resolve;
+            writer._closedPromise_reject = reject;
+            writer._closedPromiseState = 'pending';
+        });
+    }
+    function defaultWriterClosedPromiseInitializeAsRejected(writer, reason) {
+        defaultWriterClosedPromiseInitialize(writer);
+        defaultWriterClosedPromiseReject(writer, reason);
+    }
+    function defaultWriterClosedPromiseInitializeAsResolved(writer) {
+        defaultWriterClosedPromiseInitialize(writer);
+        defaultWriterClosedPromiseResolve(writer);
+    }
+    function defaultWriterClosedPromiseReject(writer, reason) {
+        if (writer._closedPromise_reject === undefined) {
+            return;
+        }
+        setPromiseIsHandledToTrue(writer._closedPromise);
+        writer._closedPromise_reject(reason);
+        writer._closedPromise_resolve = undefined;
+        writer._closedPromise_reject = undefined;
+        writer._closedPromiseState = 'rejected';
+    }
+    function defaultWriterClosedPromiseResetToRejected(writer, reason) {
+        defaultWriterClosedPromiseInitializeAsRejected(writer, reason);
+    }
+    function defaultWriterClosedPromiseResolve(writer) {
+        if (writer._closedPromise_resolve === undefined) {
+            return;
+        }
+        writer._closedPromise_resolve(undefined);
+        writer._closedPromise_resolve = undefined;
+        writer._closedPromise_reject = undefined;
+        writer._closedPromiseState = 'resolved';
+    }
+    function defaultWriterReadyPromiseInitialize(writer) {
+        writer._readyPromise = newPromise((resolve, reject) => {
+            writer._readyPromise_resolve = resolve;
+            writer._readyPromise_reject = reject;
+        });
+        writer._readyPromiseState = 'pending';
+    }
+    function defaultWriterReadyPromiseInitializeAsRejected(writer, reason) {
+        defaultWriterReadyPromiseInitialize(writer);
+        defaultWriterReadyPromiseReject(writer, reason);
+    }
+    function defaultWriterReadyPromiseInitializeAsResolved(writer) {
+        defaultWriterReadyPromiseInitialize(writer);
+        defaultWriterReadyPromiseResolve(writer);
+    }
+    function defaultWriterReadyPromiseReject(writer, reason) {
+        if (writer._readyPromise_reject === undefined) {
+            return;
+        }
+        setPromiseIsHandledToTrue(writer._readyPromise);
+        writer._readyPromise_reject(reason);
+        writer._readyPromise_resolve = undefined;
+        writer._readyPromise_reject = undefined;
+        writer._readyPromiseState = 'rejected';
+    }
+    function defaultWriterReadyPromiseReset(writer) {
+        defaultWriterReadyPromiseInitialize(writer);
+    }
+    function defaultWriterReadyPromiseResetToRejected(writer, reason) {
+        defaultWriterReadyPromiseInitializeAsRejected(writer, reason);
+    }
+    function defaultWriterReadyPromiseResolve(writer) {
+        if (writer._readyPromise_resolve === undefined) {
+            return;
+        }
+        writer._readyPromise_resolve(undefined);
+        writer._readyPromise_resolve = undefined;
+        writer._readyPromise_reject = undefined;
+        writer._readyPromiseState = 'fulfilled';
+    }
+
+    /// <reference lib="dom" />
+    const NativeDOMException = typeof DOMException !== 'undefined' ? DOMException : undefined;
+
+    /// <reference types="node" />
+    function isDOMExceptionConstructor(ctor) {
+        if (!(typeof ctor === 'function' || typeof ctor === 'object')) {
+            return false;
+        }
+        try {
+            new ctor();
+            return true;
+        }
+        catch (_a) {
+            return false;
+        }
+    }
+    function createDOMExceptionPolyfill() {
+        // eslint-disable-next-line no-shadow
+        const ctor = function DOMException(message, name) {
+            this.message = message || '';
+            this.name = name || 'Error';
+            if (Error.captureStackTrace) {
+                Error.captureStackTrace(this, this.constructor);
+            }
+        };
+        ctor.prototype = Object.create(Error.prototype);
+        Object.defineProperty(ctor.prototype, 'constructor', { value: ctor, writable: true, configurable: true });
+        return ctor;
+    }
+    // eslint-disable-next-line no-redeclare
+    const DOMException$1 = isDOMExceptionConstructor(NativeDOMException) ? NativeDOMException : createDOMExceptionPolyfill();
+
+    function ReadableStreamPipeTo(source, dest, preventClose, preventAbort, preventCancel, signal) {
+        const reader = AcquireReadableStreamDefaultReader(source);
+        const writer = AcquireWritableStreamDefaultWriter(dest);
+        source._disturbed = true;
+        let shuttingDown = false;
+        // This is used to keep track of the spec's requirement that we wait for ongoing writes during shutdown.
+        let currentWrite = promiseResolvedWith(undefined);
+        return newPromise((resolve, reject) => {
+            let abortAlgorithm;
+            if (signal !== undefined) {
+                abortAlgorithm = () => {
+                    const error = new DOMException$1('Aborted', 'AbortError');
+                    const actions = [];
+                    if (!preventAbort) {
+                        actions.push(() => {
+                            if (dest._state === 'writable') {
+                                return WritableStreamAbort(dest, error);
+                            }
+                            return promiseResolvedWith(undefined);
+                        });
+                    }
+                    if (!preventCancel) {
+                        actions.push(() => {
+                            if (source._state === 'readable') {
+                                return ReadableStreamCancel(source, error);
+                            }
+                            return promiseResolvedWith(undefined);
+                        });
+                    }
+                    shutdownWithAction(() => Promise.all(actions.map(action => action())), true, error);
+                };
+                if (signal.aborted) {
+                    abortAlgorithm();
+                    return;
+                }
+                signal.addEventListener('abort', abortAlgorithm);
+            }
+            // Using reader and writer, read all chunks from this and write them to dest
+            // - Backpressure must be enforced
+            // - Shutdown must stop all activity
+            function pipeLoop() {
+                return newPromise((resolveLoop, rejectLoop) => {
+                    function next(done) {
+                        if (done) {
+                            resolveLoop();
+                        }
+                        else {
+                            // Use `PerformPromiseThen` instead of `uponPromise` to avoid
+                            // adding unnecessary `.catch(rethrowAssertionErrorRejection)` handlers
+                            PerformPromiseThen(pipeStep(), next, rejectLoop);
+                        }
+                    }
+                    next(false);
+                });
+            }
+            function pipeStep() {
+                if (shuttingDown) {
+                    return promiseResolvedWith(true);
+                }
+                return PerformPromiseThen(writer._readyPromise, () => {
+                    return newPromise((resolveRead, rejectRead) => {
+                        ReadableStreamDefaultReaderRead(reader, {
+                            _chunkSteps: chunk => {
+                                currentWrite = PerformPromiseThen(WritableStreamDefaultWriterWrite(writer, chunk), undefined, noop);
+                                resolveRead(false);
+                            },
+                            _closeSteps: () => resolveRead(true),
+                            _errorSteps: rejectRead
+                        });
+                    });
+                });
+            }
+            // Errors must be propagated forward
+            isOrBecomesErrored(source, reader._closedPromise, storedError => {
+                if (!preventAbort) {
+                    shutdownWithAction(() => WritableStreamAbort(dest, storedError), true, storedError);
+                }
+                else {
+                    shutdown(true, storedError);
+                }
+            });
+            // Errors must be propagated backward
+            isOrBecomesErrored(dest, writer._closedPromise, storedError => {
+                if (!preventCancel) {
+                    shutdownWithAction(() => ReadableStreamCancel(source, storedError), true, storedError);
+                }
+                else {
+                    shutdown(true, storedError);
+                }
+            });
+            // Closing must be propagated forward
+            isOrBecomesClosed(source, reader._closedPromise, () => {
+                if (!preventClose) {
+                    shutdownWithAction(() => WritableStreamDefaultWriterCloseWithErrorPropagation(writer));
+                }
+                else {
+                    shutdown();
+                }
+            });
+            // Closing must be propagated backward
+            if (WritableStreamCloseQueuedOrInFlight(dest) || dest._state === 'closed') {
+                const destClosed = new TypeError('the destination writable stream closed before all data could be piped to it');
+                if (!preventCancel) {
+                    shutdownWithAction(() => ReadableStreamCancel(source, destClosed), true, destClosed);
+                }
+                else {
+                    shutdown(true, destClosed);
+                }
+            }
+            setPromiseIsHandledToTrue(pipeLoop());
+            function waitForWritesToFinish() {
+                // Another write may have started while we were waiting on this currentWrite, so we have to be sure to wait
+                // for that too.
+                const oldCurrentWrite = currentWrite;
+                return PerformPromiseThen(currentWrite, () => oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined);
+            }
+            function isOrBecomesErrored(stream, promise, action) {
+                if (stream._state === 'errored') {
+                    action(stream._storedError);
+                }
+                else {
+                    uponRejection(promise, action);
+                }
+            }
+            function isOrBecomesClosed(stream, promise, action) {
+                if (stream._state === 'closed') {
+                    action();
+                }
+                else {
+                    uponFulfillment(promise, action);
+                }
+            }
+            function shutdownWithAction(action, originalIsError, originalError) {
+                if (shuttingDown) {
+                    return;
+                }
+                shuttingDown = true;
+                if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {
+                    uponFulfillment(waitForWritesToFinish(), doTheRest);
+                }
+                else {
+                    doTheRest();
+                }
+                function doTheRest() {
+                    uponPromise(action(), () => finalize(originalIsError, originalError), newError => finalize(true, newError));
+                }
+            }
+            function shutdown(isError, error) {
+                if (shuttingDown) {
+                    return;
+                }
+                shuttingDown = true;
+                if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {
+                    uponFulfillment(waitForWritesToFinish(), () => finalize(isError, error));
+                }
+                else {
+                    finalize(isError, error);
+                }
+            }
+            function finalize(isError, error) {
+                WritableStreamDefaultWriterRelease(writer);
+                ReadableStreamReaderGenericRelease(reader);
+                if (signal !== undefined) {
+                    signal.removeEventListener('abort', abortAlgorithm);
+                }
+                if (isError) {
+                    reject(error);
+                }
+                else {
+                    resolve(undefined);
+                }
+            }
+        });
+    }
+
+    /**
+     * Allows control of a {@link ReadableStream | readable stream}'s state and internal queue.
+     *
+     * @public
+     */
+    class ReadableStreamDefaultController {
+        constructor() {
+            throw new TypeError('Illegal constructor');
+        }
+        /**
+         * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is
+         * over-full. An underlying source ought to use this information to determine when and how to apply backpressure.
+         */
+        get desiredSize() {
+            if (!IsReadableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$1('desiredSize');
+            }
+            return ReadableStreamDefaultControllerGetDesiredSize(this);
+        }
+        /**
+         * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from
+         * the stream, but once those are read, the stream will become closed.
+         */
+        close() {
+            if (!IsReadableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$1('close');
+            }
+            if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {
+                throw new TypeError('The stream is not in a state that permits close');
+            }
+            ReadableStreamDefaultControllerClose(this);
+        }
+        enqueue(chunk = undefined) {
+            if (!IsReadableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$1('enqueue');
+            }
+            if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {
+                throw new TypeError('The stream is not in a state that permits enqueue');
+            }
+            return ReadableStreamDefaultControllerEnqueue(this, chunk);
+        }
+        /**
+         * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.
+         */
+        error(e = undefined) {
+            if (!IsReadableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$1('error');
+            }
+            ReadableStreamDefaultControllerError(this, e);
+        }
+        /** @internal */
+        [CancelSteps](reason) {
+            ResetQueue(this);
+            const result = this._cancelAlgorithm(reason);
+            ReadableStreamDefaultControllerClearAlgorithms(this);
+            return result;
+        }
+        /** @internal */
+        [PullSteps](readRequest) {
+            const stream = this._controlledReadableStream;
+            if (this._queue.length > 0) {
+                const chunk = DequeueValue(this);
+                if (this._closeRequested && this._queue.length === 0) {
+                    ReadableStreamDefaultControllerClearAlgorithms(this);
+                    ReadableStreamClose(stream);
+                }
+                else {
+                    ReadableStreamDefaultControllerCallPullIfNeeded(this);
+                }
+                readRequest._chunkSteps(chunk);
+            }
+            else {
+                ReadableStreamAddReadRequest(stream, readRequest);
+                ReadableStreamDefaultControllerCallPullIfNeeded(this);
+            }
+        }
+    }
+    Object.defineProperties(ReadableStreamDefaultController.prototype, {
+        close: { enumerable: true },
+        enqueue: { enumerable: true },
+        error: { enumerable: true },
+        desiredSize: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableStreamDefaultController',
+            configurable: true
+        });
+    }
+    // Abstract operations for the ReadableStreamDefaultController.
+    function IsReadableStreamDefaultController(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableStream')) {
+            return false;
+        }
+        return x instanceof ReadableStreamDefaultController;
+    }
+    function ReadableStreamDefaultControllerCallPullIfNeeded(controller) {
+        const shouldPull = ReadableStreamDefaultControllerShouldCallPull(controller);
+        if (!shouldPull) {
+            return;
+        }
+        if (controller._pulling) {
+            controller._pullAgain = true;
+            return;
+        }
+        controller._pulling = true;
+        const pullPromise = controller._pullAlgorithm();
+        uponPromise(pullPromise, () => {
+            controller._pulling = false;
+            if (controller._pullAgain) {
+                controller._pullAgain = false;
+                ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+            }
+        }, e => {
+            ReadableStreamDefaultControllerError(controller, e);
+        });
+    }
+    function ReadableStreamDefaultControllerShouldCallPull(controller) {
+        const stream = controller._controlledReadableStream;
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+            return false;
+        }
+        if (!controller._started) {
+            return false;
+        }
+        if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+            return true;
+        }
+        const desiredSize = ReadableStreamDefaultControllerGetDesiredSize(controller);
+        if (desiredSize > 0) {
+            return true;
+        }
+        return false;
+    }
+    function ReadableStreamDefaultControllerClearAlgorithms(controller) {
+        controller._pullAlgorithm = undefined;
+        controller._cancelAlgorithm = undefined;
+        controller._strategySizeAlgorithm = undefined;
+    }
+    // A client of ReadableStreamDefaultController may use these functions directly to bypass state check.
+    function ReadableStreamDefaultControllerClose(controller) {
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+            return;
+        }
+        const stream = controller._controlledReadableStream;
+        controller._closeRequested = true;
+        if (controller._queue.length === 0) {
+            ReadableStreamDefaultControllerClearAlgorithms(controller);
+            ReadableStreamClose(stream);
+        }
+    }
+    function ReadableStreamDefaultControllerEnqueue(controller, chunk) {
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+            return;
+        }
+        const stream = controller._controlledReadableStream;
+        if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+            ReadableStreamFulfillReadRequest(stream, chunk, false);
+        }
+        else {
+            let chunkSize;
+            try {
+                chunkSize = controller._strategySizeAlgorithm(chunk);
+            }
+            catch (chunkSizeE) {
+                ReadableStreamDefaultControllerError(controller, chunkSizeE);
+                throw chunkSizeE;
+            }
+            try {
+                EnqueueValueWithSize(controller, chunk, chunkSize);
+            }
+            catch (enqueueE) {
+                ReadableStreamDefaultControllerError(controller, enqueueE);
+                throw enqueueE;
+            }
+        }
+        ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+    }
+    function ReadableStreamDefaultControllerError(controller, e) {
+        const stream = controller._controlledReadableStream;
+        if (stream._state !== 'readable') {
+            return;
+        }
+        ResetQueue(controller);
+        ReadableStreamDefaultControllerClearAlgorithms(controller);
+        ReadableStreamError(stream, e);
+    }
+    function ReadableStreamDefaultControllerGetDesiredSize(controller) {
+        const state = controller._controlledReadableStream._state;
+        if (state === 'errored') {
+            return null;
+        }
+        if (state === 'closed') {
+            return 0;
+        }
+        return controller._strategyHWM - controller._queueTotalSize;
+    }
+    // This is used in the implementation of TransformStream.
+    function ReadableStreamDefaultControllerHasBackpressure(controller) {
+        if (ReadableStreamDefaultControllerShouldCallPull(controller)) {
+            return false;
+        }
+        return true;
+    }
+    function ReadableStreamDefaultControllerCanCloseOrEnqueue(controller) {
+        const state = controller._controlledReadableStream._state;
+        if (!controller._closeRequested && state === 'readable') {
+            return true;
+        }
+        return false;
+    }
+    function SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm) {
+        controller._controlledReadableStream = stream;
+        controller._queue = undefined;
+        controller._queueTotalSize = undefined;
+        ResetQueue(controller);
+        controller._started = false;
+        controller._closeRequested = false;
+        controller._pullAgain = false;
+        controller._pulling = false;
+        controller._strategySizeAlgorithm = sizeAlgorithm;
+        controller._strategyHWM = highWaterMark;
+        controller._pullAlgorithm = pullAlgorithm;
+        controller._cancelAlgorithm = cancelAlgorithm;
+        stream._readableStreamController = controller;
+        const startResult = startAlgorithm();
+        uponPromise(promiseResolvedWith(startResult), () => {
+            controller._started = true;
+            ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+        }, r => {
+            ReadableStreamDefaultControllerError(controller, r);
+        });
+    }
+    function SetUpReadableStreamDefaultControllerFromUnderlyingSource(stream, underlyingSource, highWaterMark, sizeAlgorithm) {
+        const controller = Object.create(ReadableStreamDefaultController.prototype);
+        let startAlgorithm = () => undefined;
+        let pullAlgorithm = () => promiseResolvedWith(undefined);
+        let cancelAlgorithm = () => promiseResolvedWith(undefined);
+        if (underlyingSource.start !== undefined) {
+            startAlgorithm = () => underlyingSource.start(controller);
+        }
+        if (underlyingSource.pull !== undefined) {
+            pullAlgorithm = () => underlyingSource.pull(controller);
+        }
+        if (underlyingSource.cancel !== undefined) {
+            cancelAlgorithm = reason => underlyingSource.cancel(reason);
+        }
+        SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm);
+    }
+    // Helper functions for the ReadableStreamDefaultController.
+    function defaultControllerBrandCheckException$1(name) {
+        return new TypeError(`ReadableStreamDefaultController.prototype.${name} can only be used on a ReadableStreamDefaultController`);
+    }
+
+    function ReadableStreamTee(stream, cloneForBranch2) {
+        if (IsReadableByteStreamController(stream._readableStreamController)) {
+            return ReadableByteStreamTee(stream);
+        }
+        return ReadableStreamDefaultTee(stream);
+    }
+    function ReadableStreamDefaultTee(stream, cloneForBranch2) {
+        const reader = AcquireReadableStreamDefaultReader(stream);
+        let reading = false;
+        let readAgain = false;
+        let canceled1 = false;
+        let canceled2 = false;
+        let reason1;
+        let reason2;
+        let branch1;
+        let branch2;
+        let resolveCancelPromise;
+        const cancelPromise = newPromise(resolve => {
+            resolveCancelPromise = resolve;
+        });
+        function pullAlgorithm() {
+            if (reading) {
+                readAgain = true;
+                return promiseResolvedWith(undefined);
+            }
+            reading = true;
+            const readRequest = {
+                _chunkSteps: chunk => {
+                    // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                    // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                    // successful synchronously-available reads get ahead of asynchronously-available errors.
+                    queueMicrotask(() => {
+                        readAgain = false;
+                        const chunk1 = chunk;
+                        const chunk2 = chunk;
+                        // There is no way to access the cloning code right now in the reference implementation.
+                        // If we add one then we'll need an implementation for serializable objects.
+                        // if (!canceled2 && cloneForBranch2) {
+                        //   chunk2 = StructuredDeserialize(StructuredSerialize(chunk2));
+                        // }
+                        if (!canceled1) {
+                            ReadableStreamDefaultControllerEnqueue(branch1._readableStreamController, chunk1);
+                        }
+                        if (!canceled2) {
+                            ReadableStreamDefaultControllerEnqueue(branch2._readableStreamController, chunk2);
+                        }
+                        reading = false;
+                        if (readAgain) {
+                            pullAlgorithm();
+                        }
+                    });
+                },
+                _closeSteps: () => {
+                    reading = false;
+                    if (!canceled1) {
+                        ReadableStreamDefaultControllerClose(branch1._readableStreamController);
+                    }
+                    if (!canceled2) {
+                        ReadableStreamDefaultControllerClose(branch2._readableStreamController);
+                    }
+                    if (!canceled1 || !canceled2) {
+                        resolveCancelPromise(undefined);
+                    }
+                },
+                _errorSteps: () => {
+                    reading = false;
+                }
+            };
+            ReadableStreamDefaultReaderRead(reader, readRequest);
+            return promiseResolvedWith(undefined);
+        }
+        function cancel1Algorithm(reason) {
+            canceled1 = true;
+            reason1 = reason;
+            if (canceled2) {
+                const compositeReason = CreateArrayFromList([reason1, reason2]);
+                const cancelResult = ReadableStreamCancel(stream, compositeReason);
+                resolveCancelPromise(cancelResult);
+            }
+            return cancelPromise;
+        }
+        function cancel2Algorithm(reason) {
+            canceled2 = true;
+            reason2 = reason;
+            if (canceled1) {
+                const compositeReason = CreateArrayFromList([reason1, reason2]);
+                const cancelResult = ReadableStreamCancel(stream, compositeReason);
+                resolveCancelPromise(cancelResult);
+            }
+            return cancelPromise;
+        }
+        function startAlgorithm() {
+            // do nothing
+        }
+        branch1 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel1Algorithm);
+        branch2 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel2Algorithm);
+        uponRejection(reader._closedPromise, (r) => {
+            ReadableStreamDefaultControllerError(branch1._readableStreamController, r);
+            ReadableStreamDefaultControllerError(branch2._readableStreamController, r);
+            if (!canceled1 || !canceled2) {
+                resolveCancelPromise(undefined);
+            }
+        });
+        return [branch1, branch2];
+    }
+    function ReadableByteStreamTee(stream) {
+        let reader = AcquireReadableStreamDefaultReader(stream);
+        let reading = false;
+        let readAgainForBranch1 = false;
+        let readAgainForBranch2 = false;
+        let canceled1 = false;
+        let canceled2 = false;
+        let reason1;
+        let reason2;
+        let branch1;
+        let branch2;
+        let resolveCancelPromise;
+        const cancelPromise = newPromise(resolve => {
+            resolveCancelPromise = resolve;
+        });
+        function forwardReaderError(thisReader) {
+            uponRejection(thisReader._closedPromise, r => {
+                if (thisReader !== reader) {
+                    return;
+                }
+                ReadableByteStreamControllerError(branch1._readableStreamController, r);
+                ReadableByteStreamControllerError(branch2._readableStreamController, r);
+                if (!canceled1 || !canceled2) {
+                    resolveCancelPromise(undefined);
+                }
+            });
+        }
+        function pullWithDefaultReader() {
+            if (IsReadableStreamBYOBReader(reader)) {
+                ReadableStreamReaderGenericRelease(reader);
+                reader = AcquireReadableStreamDefaultReader(stream);
+                forwardReaderError(reader);
+            }
+            const readRequest = {
+                _chunkSteps: chunk => {
+                    // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                    // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                    // successful synchronously-available reads get ahead of asynchronously-available errors.
+                    queueMicrotask(() => {
+                        readAgainForBranch1 = false;
+                        readAgainForBranch2 = false;
+                        const chunk1 = chunk;
+                        let chunk2 = chunk;
+                        if (!canceled1 && !canceled2) {
+                            try {
+                                chunk2 = CloneAsUint8Array(chunk);
+                            }
+                            catch (cloneE) {
+                                ReadableByteStreamControllerError(branch1._readableStreamController, cloneE);
+                                ReadableByteStreamControllerError(branch2._readableStreamController, cloneE);
+                                resolveCancelPromise(ReadableStreamCancel(stream, cloneE));
+                                return;
+                            }
+                        }
+                        if (!canceled1) {
+                            ReadableByteStreamControllerEnqueue(branch1._readableStreamController, chunk1);
+                        }
+                        if (!canceled2) {
+                            ReadableByteStreamControllerEnqueue(branch2._readableStreamController, chunk2);
+                        }
+                        reading = false;
+                        if (readAgainForBranch1) {
+                            pull1Algorithm();
+                        }
+                        else if (readAgainForBranch2) {
+                            pull2Algorithm();
+                        }
+                    });
+                },
+                _closeSteps: () => {
+                    reading = false;
+                    if (!canceled1) {
+                        ReadableByteStreamControllerClose(branch1._readableStreamController);
+                    }
+                    if (!canceled2) {
+                        ReadableByteStreamControllerClose(branch2._readableStreamController);
+                    }
+                    if (branch1._readableStreamController._pendingPullIntos.length > 0) {
+                        ReadableByteStreamControllerRespond(branch1._readableStreamController, 0);
+                    }
+                    if (branch2._readableStreamController._pendingPullIntos.length > 0) {
+                        ReadableByteStreamControllerRespond(branch2._readableStreamController, 0);
+                    }
+                    if (!canceled1 || !canceled2) {
+                        resolveCancelPromise(undefined);
+                    }
+                },
+                _errorSteps: () => {
+                    reading = false;
+                }
+            };
+            ReadableStreamDefaultReaderRead(reader, readRequest);
+        }
+        function pullWithBYOBReader(view, forBranch2) {
+            if (IsReadableStreamDefaultReader(reader)) {
+                ReadableStreamReaderGenericRelease(reader);
+                reader = AcquireReadableStreamBYOBReader(stream);
+                forwardReaderError(reader);
+            }
+            const byobBranch = forBranch2 ? branch2 : branch1;
+            const otherBranch = forBranch2 ? branch1 : branch2;
+            const readIntoRequest = {
+                _chunkSteps: chunk => {
+                    // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                    // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                    // successful synchronously-available reads get ahead of asynchronously-available errors.
+                    queueMicrotask(() => {
+                        readAgainForBranch1 = false;
+                        readAgainForBranch2 = false;
+                        const byobCanceled = forBranch2 ? canceled2 : canceled1;
+                        const otherCanceled = forBranch2 ? canceled1 : canceled2;
+                        if (!otherCanceled) {
+                            let clonedChunk;
+                            try {
+                                clonedChunk = CloneAsUint8Array(chunk);
+                            }
+                            catch (cloneE) {
+                                ReadableByteStreamControllerError(byobBranch._readableStreamController, cloneE);
+                                ReadableByteStreamControllerError(otherBranch._readableStreamController, cloneE);
+                                resolveCancelPromise(ReadableStreamCancel(stream, cloneE));
+                                return;
+                            }
+                            if (!byobCanceled) {
+                                ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                            }
+                            ReadableByteStreamControllerEnqueue(otherBranch._readableStreamController, clonedChunk);
+                        }
+                        else if (!byobCanceled) {
+                            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                        }
+                        reading = false;
+                        if (readAgainForBranch1) {
+                            pull1Algorithm();
+                        }
+                        else if (readAgainForBranch2) {
+                            pull2Algorithm();
+                        }
+                    });
+                },
+                _closeSteps: chunk => {
+                    reading = false;
+                    const byobCanceled = forBranch2 ? canceled2 : canceled1;
+                    const otherCanceled = forBranch2 ? canceled1 : canceled2;
+                    if (!byobCanceled) {
+                        ReadableByteStreamControllerClose(byobBranch._readableStreamController);
+                    }
+                    if (!otherCanceled) {
+                        ReadableByteStreamControllerClose(otherBranch._readableStreamController);
+                    }
+                    if (chunk !== undefined) {
+                        if (!byobCanceled) {
+                            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                        }
+                        if (!otherCanceled && otherBranch._readableStreamController._pendingPullIntos.length > 0) {
+                            ReadableByteStreamControllerRespond(otherBranch._readableStreamController, 0);
+                        }
+                    }
+                    if (!byobCanceled || !otherCanceled) {
+                        resolveCancelPromise(undefined);
+                    }
+                },
+                _errorSteps: () => {
+                    reading = false;
+                }
+            };
+            ReadableStreamBYOBReaderRead(reader, view, readIntoRequest);
+        }
+        function pull1Algorithm() {
+            if (reading) {
+                readAgainForBranch1 = true;
+                return promiseResolvedWith(undefined);
+            }
+            reading = true;
+            const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch1._readableStreamController);
+            if (byobRequest === null) {
+                pullWithDefaultReader();
+            }
+            else {
+                pullWithBYOBReader(byobRequest._view, false);
+            }
+            return promiseResolvedWith(undefined);
+        }
+        function pull2Algorithm() {
+            if (reading) {
+                readAgainForBranch2 = true;
+                return promiseResolvedWith(undefined);
+            }
+            reading = true;
+            const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch2._readableStreamController);
+            if (byobRequest === null) {
+                pullWithDefaultReader();
+            }
+            else {
+                pullWithBYOBReader(byobRequest._view, true);
+            }
+            return promiseResolvedWith(undefined);
+        }
+        function cancel1Algorithm(reason) {
+            canceled1 = true;
+            reason1 = reason;
+            if (canceled2) {
+                const compositeReason = CreateArrayFromList([reason1, reason2]);
+                const cancelResult = ReadableStreamCancel(stream, compositeReason);
+                resolveCancelPromise(cancelResult);
+            }
+            return cancelPromise;
+        }
+        function cancel2Algorithm(reason) {
+            canceled2 = true;
+            reason2 = reason;
+            if (canceled1) {
+                const compositeReason = CreateArrayFromList([reason1, reason2]);
+                const cancelResult = ReadableStreamCancel(stream, compositeReason);
+                resolveCancelPromise(cancelResult);
+            }
+            return cancelPromise;
+        }
+        function startAlgorithm() {
+            return;
+        }
+        branch1 = CreateReadableByteStream(startAlgorithm, pull1Algorithm, cancel1Algorithm);
+        branch2 = CreateReadableByteStream(startAlgorithm, pull2Algorithm, cancel2Algorithm);
+        forwardReaderError(reader);
+        return [branch1, branch2];
+    }
+
+    function convertUnderlyingDefaultOrByteSource(source, context) {
+        assertDictionary(source, context);
+        const original = source;
+        const autoAllocateChunkSize = original === null || original === void 0 ? void 0 : original.autoAllocateChunkSize;
+        const cancel = original === null || original === void 0 ? void 0 : original.cancel;
+        const pull = original === null || original === void 0 ? void 0 : original.pull;
+        const start = original === null || original === void 0 ? void 0 : original.start;
+        const type = original === null || original === void 0 ? void 0 : original.type;
+        return {
+            autoAllocateChunkSize: autoAllocateChunkSize === undefined ?
+                undefined :
+                convertUnsignedLongLongWithEnforceRange(autoAllocateChunkSize, `${context} has member 'autoAllocateChunkSize' that`),
+            cancel: cancel === undefined ?
+                undefined :
+                convertUnderlyingSourceCancelCallback(cancel, original, `${context} has member 'cancel' that`),
+            pull: pull === undefined ?
+                undefined :
+                convertUnderlyingSourcePullCallback(pull, original, `${context} has member 'pull' that`),
+            start: start === undefined ?
+                undefined :
+                convertUnderlyingSourceStartCallback(start, original, `${context} has member 'start' that`),
+            type: type === undefined ? undefined : convertReadableStreamType(type, `${context} has member 'type' that`)
+        };
+    }
+    function convertUnderlyingSourceCancelCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (reason) => promiseCall(fn, original, [reason]);
+    }
+    function convertUnderlyingSourcePullCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (controller) => promiseCall(fn, original, [controller]);
+    }
+    function convertUnderlyingSourceStartCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (controller) => reflectCall(fn, original, [controller]);
+    }
+    function convertReadableStreamType(type, context) {
+        type = `${type}`;
+        if (type !== 'bytes') {
+            throw new TypeError(`${context} '${type}' is not a valid enumeration value for ReadableStreamType`);
+        }
+        return type;
+    }
+
+    function convertReaderOptions(options, context) {
+        assertDictionary(options, context);
+        const mode = options === null || options === void 0 ? void 0 : options.mode;
+        return {
+            mode: mode === undefined ? undefined : convertReadableStreamReaderMode(mode, `${context} has member 'mode' that`)
+        };
+    }
+    function convertReadableStreamReaderMode(mode, context) {
+        mode = `${mode}`;
+        if (mode !== 'byob') {
+            throw new TypeError(`${context} '${mode}' is not a valid enumeration value for ReadableStreamReaderMode`);
+        }
+        return mode;
+    }
+
+    function convertIteratorOptions(options, context) {
+        assertDictionary(options, context);
+        const preventCancel = options === null || options === void 0 ? void 0 : options.preventCancel;
+        return { preventCancel: Boolean(preventCancel) };
+    }
+
+    function convertPipeOptions(options, context) {
+        assertDictionary(options, context);
+        const preventAbort = options === null || options === void 0 ? void 0 : options.preventAbort;
+        const preventCancel = options === null || options === void 0 ? void 0 : options.preventCancel;
+        const preventClose = options === null || options === void 0 ? void 0 : options.preventClose;
+        const signal = options === null || options === void 0 ? void 0 : options.signal;
+        if (signal !== undefined) {
+            assertAbortSignal(signal, `${context} has member 'signal' that`);
+        }
+        return {
+            preventAbort: Boolean(preventAbort),
+            preventCancel: Boolean(preventCancel),
+            preventClose: Boolean(preventClose),
+            signal
+        };
+    }
+    function assertAbortSignal(signal, context) {
+        if (!isAbortSignal(signal)) {
+            throw new TypeError(`${context} is not an AbortSignal.`);
+        }
+    }
+
+    function convertReadableWritablePair(pair, context) {
+        assertDictionary(pair, context);
+        const readable = pair === null || pair === void 0 ? void 0 : pair.readable;
+        assertRequiredField(readable, 'readable', 'ReadableWritablePair');
+        assertReadableStream(readable, `${context} has member 'readable' that`);
+        const writable = pair === null || pair === void 0 ? void 0 : pair.writable;
+        assertRequiredField(writable, 'writable', 'ReadableWritablePair');
+        assertWritableStream(writable, `${context} has member 'writable' that`);
+        return { readable, writable };
+    }
+
+    /**
+     * A readable stream represents a source of data, from which you can read.
+     *
+     * @public
+     */
+    class ReadableStream {
+        constructor(rawUnderlyingSource = {}, rawStrategy = {}) {
+            if (rawUnderlyingSource === undefined) {
+                rawUnderlyingSource = null;
+            }
+            else {
+                assertObject(rawUnderlyingSource, 'First parameter');
+            }
+            const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');
+            const underlyingSource = convertUnderlyingDefaultOrByteSource(rawUnderlyingSource, 'First parameter');
+            InitializeReadableStream(this);
+            if (underlyingSource.type === 'bytes') {
+                if (strategy.size !== undefined) {
+                    throw new RangeError('The strategy for a byte stream cannot have a size function');
+                }
+                const highWaterMark = ExtractHighWaterMark(strategy, 0);
+                SetUpReadableByteStreamControllerFromUnderlyingSource(this, underlyingSource, highWaterMark);
+            }
+            else {
+                const sizeAlgorithm = ExtractSizeAlgorithm(strategy);
+                const highWaterMark = ExtractHighWaterMark(strategy, 1);
+                SetUpReadableStreamDefaultControllerFromUnderlyingSource(this, underlyingSource, highWaterMark, sizeAlgorithm);
+            }
+        }
+        /**
+         * Whether or not the readable stream is locked to a {@link ReadableStreamDefaultReader | reader}.
+         */
+        get locked() {
+            if (!IsReadableStream(this)) {
+                throw streamBrandCheckException$1('locked');
+            }
+            return IsReadableStreamLocked(this);
+        }
+        /**
+         * Cancels the stream, signaling a loss of interest in the stream by a consumer.
+         *
+         * The supplied `reason` argument will be given to the underlying source's {@link UnderlyingSource.cancel | cancel()}
+         * method, which might or might not use it.
+         */
+        cancel(reason = undefined) {
+            if (!IsReadableStream(this)) {
+                return promiseRejectedWith(streamBrandCheckException$1('cancel'));
+            }
+            if (IsReadableStreamLocked(this)) {
+                return promiseRejectedWith(new TypeError('Cannot cancel a stream that already has a reader'));
+            }
+            return ReadableStreamCancel(this, reason);
+        }
+        getReader(rawOptions = undefined) {
+            if (!IsReadableStream(this)) {
+                throw streamBrandCheckException$1('getReader');
+            }
+            const options = convertReaderOptions(rawOptions, 'First parameter');
+            if (options.mode === undefined) {
+                return AcquireReadableStreamDefaultReader(this);
+            }
+            return AcquireReadableStreamBYOBReader(this);
+        }
+        pipeThrough(rawTransform, rawOptions = {}) {
+            if (!IsReadableStream(this)) {
+                throw streamBrandCheckException$1('pipeThrough');
+            }
+            assertRequiredArgument(rawTransform, 1, 'pipeThrough');
+            const transform = convertReadableWritablePair(rawTransform, 'First parameter');
+            const options = convertPipeOptions(rawOptions, 'Second parameter');
+            if (IsReadableStreamLocked(this)) {
+                throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked ReadableStream');
+            }
+            if (IsWritableStreamLocked(transform.writable)) {
+                throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked WritableStream');
+            }
+            const promise = ReadableStreamPipeTo(this, transform.writable, options.preventClose, options.preventAbort, options.preventCancel, options.signal);
+            setPromiseIsHandledToTrue(promise);
+            return transform.readable;
+        }
+        pipeTo(destination, rawOptions = {}) {
+            if (!IsReadableStream(this)) {
+                return promiseRejectedWith(streamBrandCheckException$1('pipeTo'));
+            }
+            if (destination === undefined) {
+                return promiseRejectedWith(`Parameter 1 is required in 'pipeTo'.`);
+            }
+            if (!IsWritableStream(destination)) {
+                return promiseRejectedWith(new TypeError(`ReadableStream.prototype.pipeTo's first argument must be a WritableStream`));
+            }
+            let options;
+            try {
+                options = convertPipeOptions(rawOptions, 'Second parameter');
+            }
+            catch (e) {
+                return promiseRejectedWith(e);
+            }
+            if (IsReadableStreamLocked(this)) {
+                return promiseRejectedWith(new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream'));
+            }
+            if (IsWritableStreamLocked(destination)) {
+                return promiseRejectedWith(new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream'));
+            }
+            return ReadableStreamPipeTo(this, destination, options.preventClose, options.preventAbort, options.preventCancel, options.signal);
+        }
+        /**
+         * Tees this readable stream, returning a two-element array containing the two resulting branches as
+         * new {@link ReadableStream} instances.
+         *
+         * Teeing a stream will lock it, preventing any other consumer from acquiring a reader.
+         * To cancel the stream, cancel both of the resulting branches; a composite cancellation reason will then be
+         * propagated to the stream's underlying source.
+         *
+         * Note that the chunks seen in each branch will be the same object. If the chunks are not immutable,
+         * this could allow interference between the two branches.
+         */
+        tee() {
+            if (!IsReadableStream(this)) {
+                throw streamBrandCheckException$1('tee');
+            }
+            const branches = ReadableStreamTee(this);
+            return CreateArrayFromList(branches);
+        }
+        values(rawOptions = undefined) {
+            if (!IsReadableStream(this)) {
+                throw streamBrandCheckException$1('values');
+            }
+            const options = convertIteratorOptions(rawOptions, 'First parameter');
+            return AcquireReadableStreamAsyncIterator(this, options.preventCancel);
+        }
+    }
+    Object.defineProperties(ReadableStream.prototype, {
+        cancel: { enumerable: true },
+        getReader: { enumerable: true },
+        pipeThrough: { enumerable: true },
+        pipeTo: { enumerable: true },
+        tee: { enumerable: true },
+        values: { enumerable: true },
+        locked: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableStream.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableStream',
+            configurable: true
+        });
+    }
+    if (typeof SymbolPolyfill.asyncIterator === 'symbol') {
+        Object.defineProperty(ReadableStream.prototype, SymbolPolyfill.asyncIterator, {
+            value: ReadableStream.prototype.values,
+            writable: true,
+            configurable: true
+        });
+    }
+    // Abstract operations for the ReadableStream.
+    // Throws if and only if startAlgorithm throws.
+    function CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark = 1, sizeAlgorithm = () => 1) {
+        const stream = Object.create(ReadableStream.prototype);
+        InitializeReadableStream(stream);
+        const controller = Object.create(ReadableStreamDefaultController.prototype);
+        SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm);
+        return stream;
+    }
+    // Throws if and only if startAlgorithm throws.
+    function CreateReadableByteStream(startAlgorithm, pullAlgorithm, cancelAlgorithm) {
+        const stream = Object.create(ReadableStream.prototype);
+        InitializeReadableStream(stream);
+        const controller = Object.create(ReadableByteStreamController.prototype);
+        SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, 0, undefined);
+        return stream;
+    }
+    function InitializeReadableStream(stream) {
+        stream._state = 'readable';
+        stream._reader = undefined;
+        stream._storedError = undefined;
+        stream._disturbed = false;
+    }
+    function IsReadableStream(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_readableStreamController')) {
+            return false;
+        }
+        return x instanceof ReadableStream;
+    }
+    function IsReadableStreamLocked(stream) {
+        if (stream._reader === undefined) {
+            return false;
+        }
+        return true;
+    }
+    // ReadableStream API exposed for controllers.
+    function ReadableStreamCancel(stream, reason) {
+        stream._disturbed = true;
+        if (stream._state === 'closed') {
+            return promiseResolvedWith(undefined);
+        }
+        if (stream._state === 'errored') {
+            return promiseRejectedWith(stream._storedError);
+        }
+        ReadableStreamClose(stream);
+        const reader = stream._reader;
+        if (reader !== undefined && IsReadableStreamBYOBReader(reader)) {
+            reader._readIntoRequests.forEach(readIntoRequest => {
+                readIntoRequest._closeSteps(undefined);
+            });
+            reader._readIntoRequests = new SimpleQueue();
+        }
+        const sourceCancelPromise = stream._readableStreamController[CancelSteps](reason);
+        return transformPromiseWith(sourceCancelPromise, noop);
+    }
+    function ReadableStreamClose(stream) {
+        stream._state = 'closed';
+        const reader = stream._reader;
+        if (reader === undefined) {
+            return;
+        }
+        defaultReaderClosedPromiseResolve(reader);
+        if (IsReadableStreamDefaultReader(reader)) {
+            reader._readRequests.forEach(readRequest => {
+                readRequest._closeSteps();
+            });
+            reader._readRequests = new SimpleQueue();
+        }
+    }
+    function ReadableStreamError(stream, e) {
+        stream._state = 'errored';
+        stream._storedError = e;
+        const reader = stream._reader;
+        if (reader === undefined) {
+            return;
+        }
+        defaultReaderClosedPromiseReject(reader, e);
+        if (IsReadableStreamDefaultReader(reader)) {
+            reader._readRequests.forEach(readRequest => {
+                readRequest._errorSteps(e);
+            });
+            reader._readRequests = new SimpleQueue();
+        }
+        else {
+            reader._readIntoRequests.forEach(readIntoRequest => {
+                readIntoRequest._errorSteps(e);
+            });
+            reader._readIntoRequests = new SimpleQueue();
+        }
+    }
+    // Helper functions for the ReadableStream.
+    function streamBrandCheckException$1(name) {
+        return new TypeError(`ReadableStream.prototype.${name} can only be used on a ReadableStream`);
+    }
+
+    function convertQueuingStrategyInit(init, context) {
+        assertDictionary(init, context);
+        const highWaterMark = init === null || init === void 0 ? void 0 : init.highWaterMark;
+        assertRequiredField(highWaterMark, 'highWaterMark', 'QueuingStrategyInit');
+        return {
+            highWaterMark: convertUnrestrictedDouble(highWaterMark)
+        };
+    }
+
+    // The size function must not have a prototype property nor be a constructor
+    const byteLengthSizeFunction = (chunk) => {
+        return chunk.byteLength;
+    };
+    try {
+        Object.defineProperty(byteLengthSizeFunction, 'name', {
+            value: 'size',
+            configurable: true
+        });
+    }
+    catch (_a) {
+        // This property is non-configurable in older browsers, so ignore if this throws.
+        // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility
+    }
+    /**
+     * A queuing strategy that counts the number of bytes in each chunk.
+     *
+     * @public
+     */
+    class ByteLengthQueuingStrategy {
+        constructor(options) {
+            assertRequiredArgument(options, 1, 'ByteLengthQueuingStrategy');
+            options = convertQueuingStrategyInit(options, 'First parameter');
+            this._byteLengthQueuingStrategyHighWaterMark = options.highWaterMark;
+        }
+        /**
+         * Returns the high water mark provided to the constructor.
+         */
+        get highWaterMark() {
+            if (!IsByteLengthQueuingStrategy(this)) {
+                throw byteLengthBrandCheckException('highWaterMark');
+            }
+            return this._byteLengthQueuingStrategyHighWaterMark;
+        }
+        /**
+         * Measures the size of `chunk` by returning the value of its `byteLength` property.
+         */
+        get size() {
+            if (!IsByteLengthQueuingStrategy(this)) {
+                throw byteLengthBrandCheckException('size');
+            }
+            return byteLengthSizeFunction;
+        }
+    }
+    Object.defineProperties(ByteLengthQueuingStrategy.prototype, {
+        highWaterMark: { enumerable: true },
+        size: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ByteLengthQueuingStrategy.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ByteLengthQueuingStrategy',
+            configurable: true
+        });
+    }
+    // Helper functions for the ByteLengthQueuingStrategy.
+    function byteLengthBrandCheckException(name) {
+        return new TypeError(`ByteLengthQueuingStrategy.prototype.${name} can only be used on a ByteLengthQueuingStrategy`);
+    }
+    function IsByteLengthQueuingStrategy(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_byteLengthQueuingStrategyHighWaterMark')) {
+            return false;
+        }
+        return x instanceof ByteLengthQueuingStrategy;
+    }
+
+    // The size function must not have a prototype property nor be a constructor
+    const countSizeFunction = () => {
+        return 1;
+    };
+    try {
+        Object.defineProperty(countSizeFunction, 'name', {
+            value: 'size',
+            configurable: true
+        });
+    }
+    catch (_a) {
+        // This property is non-configurable in older browsers, so ignore if this throws.
+        // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility
+    }
+    /**
+     * A queuing strategy that counts the number of chunks.
+     *
+     * @public
+     */
+    class CountQueuingStrategy {
+        constructor(options) {
+            assertRequiredArgument(options, 1, 'CountQueuingStrategy');
+            options = convertQueuingStrategyInit(options, 'First parameter');
+            this._countQueuingStrategyHighWaterMark = options.highWaterMark;
+        }
+        /**
+         * Returns the high water mark provided to the constructor.
+         */
+        get highWaterMark() {
+            if (!IsCountQueuingStrategy(this)) {
+                throw countBrandCheckException('highWaterMark');
+            }
+            return this._countQueuingStrategyHighWaterMark;
+        }
+        /**
+         * Measures the size of `chunk` by always returning 1.
+         * This ensures that the total queue size is a count of the number of chunks in the queue.
+         */
+        get size() {
+            if (!IsCountQueuingStrategy(this)) {
+                throw countBrandCheckException('size');
+            }
+            return countSizeFunction;
+        }
+    }
+    Object.defineProperties(CountQueuingStrategy.prototype, {
+        highWaterMark: { enumerable: true },
+        size: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(CountQueuingStrategy.prototype, SymbolPolyfill.toStringTag, {
+            value: 'CountQueuingStrategy',
+            configurable: true
+        });
+    }
+    // Helper functions for the CountQueuingStrategy.
+    function countBrandCheckException(name) {
+        return new TypeError(`CountQueuingStrategy.prototype.${name} can only be used on a CountQueuingStrategy`);
+    }
+    function IsCountQueuingStrategy(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_countQueuingStrategyHighWaterMark')) {
+            return false;
+        }
+        return x instanceof CountQueuingStrategy;
+    }
+
+    function convertTransformer(original, context) {
+        assertDictionary(original, context);
+        const flush = original === null || original === void 0 ? void 0 : original.flush;
+        const readableType = original === null || original === void 0 ? void 0 : original.readableType;
+        const start = original === null || original === void 0 ? void 0 : original.start;
+        const transform = original === null || original === void 0 ? void 0 : original.transform;
+        const writableType = original === null || original === void 0 ? void 0 : original.writableType;
+        return {
+            flush: flush === undefined ?
+                undefined :
+                convertTransformerFlushCallback(flush, original, `${context} has member 'flush' that`),
+            readableType,
+            start: start === undefined ?
+                undefined :
+                convertTransformerStartCallback(start, original, `${context} has member 'start' that`),
+            transform: transform === undefined ?
+                undefined :
+                convertTransformerTransformCallback(transform, original, `${context} has member 'transform' that`),
+            writableType
+        };
+    }
+    function convertTransformerFlushCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (controller) => promiseCall(fn, original, [controller]);
+    }
+    function convertTransformerStartCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (controller) => reflectCall(fn, original, [controller]);
+    }
+    function convertTransformerTransformCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (chunk, controller) => promiseCall(fn, original, [chunk, controller]);
+    }
+
+    // Class TransformStream
+    /**
+     * A transform stream consists of a pair of streams: a {@link WritableStream | writable stream},
+     * known as its writable side, and a {@link ReadableStream | readable stream}, known as its readable side.
+     * In a manner specific to the transform stream in question, writes to the writable side result in new data being
+     * made available for reading from the readable side.
+     *
+     * @public
+     */
+    class TransformStream {
+        constructor(rawTransformer = {}, rawWritableStrategy = {}, rawReadableStrategy = {}) {
+            if (rawTransformer === undefined) {
+                rawTransformer = null;
+            }
+            const writableStrategy = convertQueuingStrategy(rawWritableStrategy, 'Second parameter');
+            const readableStrategy = convertQueuingStrategy(rawReadableStrategy, 'Third parameter');
+            const transformer = convertTransformer(rawTransformer, 'First parameter');
+            if (transformer.readableType !== undefined) {
+                throw new RangeError('Invalid readableType specified');
+            }
+            if (transformer.writableType !== undefined) {
+                throw new RangeError('Invalid writableType specified');
+            }
+            const readableHighWaterMark = ExtractHighWaterMark(readableStrategy, 0);
+            const readableSizeAlgorithm = ExtractSizeAlgorithm(readableStrategy);
+            const writableHighWaterMark = ExtractHighWaterMark(writableStrategy, 1);
+            const writableSizeAlgorithm = ExtractSizeAlgorithm(writableStrategy);
+            let startPromise_resolve;
+            const startPromise = newPromise(resolve => {
+                startPromise_resolve = resolve;
+            });
+            InitializeTransformStream(this, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm);
+            SetUpTransformStreamDefaultControllerFromTransformer(this, transformer);
+            if (transformer.start !== undefined) {
+                startPromise_resolve(transformer.start(this._transformStreamController));
+            }
+            else {
+                startPromise_resolve(undefined);
+            }
+        }
+        /**
+         * The readable side of the transform stream.
+         */
+        get readable() {
+            if (!IsTransformStream(this)) {
+                throw streamBrandCheckException('readable');
+            }
+            return this._readable;
+        }
+        /**
+         * The writable side of the transform stream.
+         */
+        get writable() {
+            if (!IsTransformStream(this)) {
+                throw streamBrandCheckException('writable');
+            }
+            return this._writable;
+        }
+    }
+    Object.defineProperties(TransformStream.prototype, {
+        readable: { enumerable: true },
+        writable: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(TransformStream.prototype, SymbolPolyfill.toStringTag, {
+            value: 'TransformStream',
+            configurable: true
+        });
+    }
+    function InitializeTransformStream(stream, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm) {
+        function startAlgorithm() {
+            return startPromise;
+        }
+        function writeAlgorithm(chunk) {
+            return TransformStreamDefaultSinkWriteAlgorithm(stream, chunk);
+        }
+        function abortAlgorithm(reason) {
+            return TransformStreamDefaultSinkAbortAlgorithm(stream, reason);
+        }
+        function closeAlgorithm() {
+            return TransformStreamDefaultSinkCloseAlgorithm(stream);
+        }
+        stream._writable = CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, writableHighWaterMark, writableSizeAlgorithm);
+        function pullAlgorithm() {
+            return TransformStreamDefaultSourcePullAlgorithm(stream);
+        }
+        function cancelAlgorithm(reason) {
+            TransformStreamErrorWritableAndUnblockWrite(stream, reason);
+            return promiseResolvedWith(undefined);
+        }
+        stream._readable = CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, readableHighWaterMark, readableSizeAlgorithm);
+        // The [[backpressure]] slot is set to undefined so that it can be initialised by TransformStreamSetBackpressure.
+        stream._backpressure = undefined;
+        stream._backpressureChangePromise = undefined;
+        stream._backpressureChangePromise_resolve = undefined;
+        TransformStreamSetBackpressure(stream, true);
+        stream._transformStreamController = undefined;
+    }
+    function IsTransformStream(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_transformStreamController')) {
+            return false;
+        }
+        return x instanceof TransformStream;
+    }
+    // This is a no-op if both sides are already errored.
+    function TransformStreamError(stream, e) {
+        ReadableStreamDefaultControllerError(stream._readable._readableStreamController, e);
+        TransformStreamErrorWritableAndUnblockWrite(stream, e);
+    }
+    function TransformStreamErrorWritableAndUnblockWrite(stream, e) {
+        TransformStreamDefaultControllerClearAlgorithms(stream._transformStreamController);
+        WritableStreamDefaultControllerErrorIfNeeded(stream._writable._writableStreamController, e);
+        if (stream._backpressure) {
+            // Pretend that pull() was called to permit any pending write() calls to complete. TransformStreamSetBackpressure()
+            // cannot be called from enqueue() or pull() once the ReadableStream is errored, so this will will be the final time
+            // _backpressure is set.
+            TransformStreamSetBackpressure(stream, false);
+        }
+    }
+    function TransformStreamSetBackpressure(stream, backpressure) {
+        // Passes also when called during construction.
+        if (stream._backpressureChangePromise !== undefined) {
+            stream._backpressureChangePromise_resolve();
+        }
+        stream._backpressureChangePromise = newPromise(resolve => {
+            stream._backpressureChangePromise_resolve = resolve;
+        });
+        stream._backpressure = backpressure;
+    }
+    // Class TransformStreamDefaultController
+    /**
+     * Allows control of the {@link ReadableStream} and {@link WritableStream} of the associated {@link TransformStream}.
+     *
+     * @public
+     */
+    class TransformStreamDefaultController {
+        constructor() {
+            throw new TypeError('Illegal constructor');
+        }
+        /**
+         * Returns the desired size to fill the readable side’s internal queue. It can be negative, if the queue is over-full.
+         */
+        get desiredSize() {
+            if (!IsTransformStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException('desiredSize');
+            }
+            const readableController = this._controlledTransformStream._readable._readableStreamController;
+            return ReadableStreamDefaultControllerGetDesiredSize(readableController);
+        }
+        enqueue(chunk = undefined) {
+            if (!IsTransformStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException('enqueue');
+            }
+            TransformStreamDefaultControllerEnqueue(this, chunk);
+        }
+        /**
+         * Errors both the readable side and the writable side of the controlled transform stream, making all future
+         * interactions with it fail with the given error `e`. Any chunks queued for transformation will be discarded.
+         */
+        error(reason = undefined) {
+            if (!IsTransformStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException('error');
+            }
+            TransformStreamDefaultControllerError(this, reason);
+        }
+        /**
+         * Closes the readable side and errors the writable side of the controlled transform stream. This is useful when the
+         * transformer only needs to consume a portion of the chunks written to the writable side.
+         */
+        terminate() {
+            if (!IsTransformStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException('terminate');
+            }
+            TransformStreamDefaultControllerTerminate(this);
+        }
+    }
+    Object.defineProperties(TransformStreamDefaultController.prototype, {
+        enqueue: { enumerable: true },
+        error: { enumerable: true },
+        terminate: { enumerable: true },
+        desiredSize: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(TransformStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+            value: 'TransformStreamDefaultController',
+            configurable: true
+        });
+    }
+    // Transform Stream Default Controller Abstract Operations
+    function IsTransformStreamDefaultController(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_controlledTransformStream')) {
+            return false;
+        }
+        return x instanceof TransformStreamDefaultController;
+    }
+    function SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm) {
+        controller._controlledTransformStream = stream;
+        stream._transformStreamController = controller;
+        controller._transformAlgorithm = transformAlgorithm;
+        controller._flushAlgorithm = flushAlgorithm;
+    }
+    function SetUpTransformStreamDefaultControllerFromTransformer(stream, transformer) {
+        const controller = Object.create(TransformStreamDefaultController.prototype);
+        let transformAlgorithm = (chunk) => {
+            try {
+                TransformStreamDefaultControllerEnqueue(controller, chunk);
+                return promiseResolvedWith(undefined);
+            }
+            catch (transformResultE) {
+                return promiseRejectedWith(transformResultE);
+            }
+        };
+        let flushAlgorithm = () => promiseResolvedWith(undefined);
+        if (transformer.transform !== undefined) {
+            transformAlgorithm = chunk => transformer.transform(chunk, controller);
+        }
+        if (transformer.flush !== undefined) {
+            flushAlgorithm = () => transformer.flush(controller);
+        }
+        SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);
+    }
+    function TransformStreamDefaultControllerClearAlgorithms(controller) {
+        controller._transformAlgorithm = undefined;
+        controller._flushAlgorithm = undefined;
+    }
+    function TransformStreamDefaultControllerEnqueue(controller, chunk) {
+        const stream = controller._controlledTransformStream;
+        const readableController = stream._readable._readableStreamController;
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(readableController)) {
+            throw new TypeError('Readable side is not in a state that permits enqueue');
+        }
+        // We throttle transform invocations based on the backpressure of the ReadableStream, but we still
+        // accept TransformStreamDefaultControllerEnqueue() calls.
+        try {
+            ReadableStreamDefaultControllerEnqueue(readableController, chunk);
+        }
+        catch (e) {
+            // This happens when readableStrategy.size() throws.
+            TransformStreamErrorWritableAndUnblockWrite(stream, e);
+            throw stream._readable._storedError;
+        }
+        const backpressure = ReadableStreamDefaultControllerHasBackpressure(readableController);
+        if (backpressure !== stream._backpressure) {
+            TransformStreamSetBackpressure(stream, true);
+        }
+    }
+    function TransformStreamDefaultControllerError(controller, e) {
+        TransformStreamError(controller._controlledTransformStream, e);
+    }
+    function TransformStreamDefaultControllerPerformTransform(controller, chunk) {
+        const transformPromise = controller._transformAlgorithm(chunk);
+        return transformPromiseWith(transformPromise, undefined, r => {
+            TransformStreamError(controller._controlledTransformStream, r);
+            throw r;
+        });
+    }
+    function TransformStreamDefaultControllerTerminate(controller) {
+        const stream = controller._controlledTransformStream;
+        const readableController = stream._readable._readableStreamController;
+        ReadableStreamDefaultControllerClose(readableController);
+        const error = new TypeError('TransformStream terminated');
+        TransformStreamErrorWritableAndUnblockWrite(stream, error);
+    }
+    // TransformStreamDefaultSink Algorithms
+    function TransformStreamDefaultSinkWriteAlgorithm(stream, chunk) {
+        const controller = stream._transformStreamController;
+        if (stream._backpressure) {
+            const backpressureChangePromise = stream._backpressureChangePromise;
+            return transformPromiseWith(backpressureChangePromise, () => {
+                const writable = stream._writable;
+                const state = writable._state;
+                if (state === 'erroring') {
+                    throw writable._storedError;
+                }
+                return TransformStreamDefaultControllerPerformTransform(controller, chunk);
+            });
+        }
+        return TransformStreamDefaultControllerPerformTransform(controller, chunk);
+    }
+    function TransformStreamDefaultSinkAbortAlgorithm(stream, reason) {
+        // abort() is not called synchronously, so it is possible for abort() to be called when the stream is already
+        // errored.
+        TransformStreamError(stream, reason);
+        return promiseResolvedWith(undefined);
+    }
+    function TransformStreamDefaultSinkCloseAlgorithm(stream) {
+        // stream._readable cannot change after construction, so caching it across a call to user code is safe.
+        const readable = stream._readable;
+        const controller = stream._transformStreamController;
+        const flushPromise = controller._flushAlgorithm();
+        TransformStreamDefaultControllerClearAlgorithms(controller);
+        // Return a promise that is fulfilled with undefined on success.
+        return transformPromiseWith(flushPromise, () => {
+            if (readable._state === 'errored') {
+                throw readable._storedError;
+            }
+            ReadableStreamDefaultControllerClose(readable._readableStreamController);
+        }, r => {
+            TransformStreamError(stream, r);
+            throw readable._storedError;
+        });
+    }
+    // TransformStreamDefaultSource Algorithms
+    function TransformStreamDefaultSourcePullAlgorithm(stream) {
+        // Invariant. Enforced by the promises returned by start() and pull().
+        TransformStreamSetBackpressure(stream, false);
+        // Prevent the next pull() call until there is backpressure.
+        return stream._backpressureChangePromise;
+    }
+    // Helper functions for the TransformStreamDefaultController.
+    function defaultControllerBrandCheckException(name) {
+        return new TypeError(`TransformStreamDefaultController.prototype.${name} can only be used on a TransformStreamDefaultController`);
+    }
+    // Helper functions for the TransformStream.
+    function streamBrandCheckException(name) {
+        return new TypeError(`TransformStream.prototype.${name} can only be used on a TransformStream`);
+    }
+
+    const exports$1 = {
+        ReadableStream,
+        ReadableStreamDefaultController,
+        ReadableByteStreamController,
+        ReadableStreamBYOBRequest,
+        ReadableStreamDefaultReader,
+        ReadableStreamBYOBReader,
+        WritableStream,
+        WritableStreamDefaultController,
+        WritableStreamDefaultWriter,
+        ByteLengthQueuingStrategy,
+        CountQueuingStrategy,
+        TransformStream,
+        TransformStreamDefaultController
+    };
+    // Add classes to global scope
+    if (typeof globals !== 'undefined') {
+        for (const prop in exports$1) {
+            if (Object.prototype.hasOwnProperty.call(exports$1, prop)) {
+                Object.defineProperty(globals, prop, {
+                    value: exports$1[prop],
+                    writable: true,
+                    configurable: true
+                });
+            }
+        }
+    }
+
+    exports.ByteLengthQueuingStrategy = ByteLengthQueuingStrategy;
+    exports.CountQueuingStrategy = CountQueuingStrategy;
+    exports.ReadableByteStreamController = ReadableByteStreamController;
+    exports.ReadableStream = ReadableStream;
+    exports.ReadableStreamBYOBReader = ReadableStreamBYOBReader;
+    exports.ReadableStreamBYOBRequest = ReadableStreamBYOBRequest;
+    exports.ReadableStreamDefaultController = ReadableStreamDefaultController;
+    exports.ReadableStreamDefaultReader = ReadableStreamDefaultReader;
+    exports.TransformStream = TransformStream;
+    exports.TransformStreamDefaultController = TransformStreamDefaultController;
+    exports.WritableStream = WritableStream;
+    exports.WritableStreamDefaultController = WritableStreamDefaultController;
+    exports.WritableStreamDefaultWriter = WritableStreamDefaultWriter;
+
+    Object.defineProperty(exports, '__esModule', { value: true });
+
+})));
+//# sourceMappingURL=polyfill.es6.js.map
diff --git a/node_modules/web-streams-polyfill/dist/polyfill.es6.js.map b/node_modules/web-streams-polyfill/dist/polyfill.es6.js.map
new file mode 100644
index 0000000..ac2d583
--- /dev/null
+++ b/node_modules/web-streams-polyfill/dist/polyfill.es6.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"polyfill.es6.js","sources":["../src/stub/symbol.ts","../src/utils.ts","../src/lib/helpers/miscellaneous.ts","../src/lib/helpers/webidl.ts","../src/lib/simple-queue.ts","../src/lib/readable-stream/generic-reader.ts","../src/lib/abstract-ops/internal-methods.ts","../src/stub/number-isfinite.ts","../src/stub/math-trunc.ts","../src/lib/validators/basic.ts","../src/lib/validators/readable-stream.ts","../src/lib/readable-stream/default-reader.ts","../src/target/es5/stub/async-iterator-prototype.ts","../src/lib/readable-stream/async-iterator.ts","../src/stub/number-isnan.ts","../src/lib/abstract-ops/ecmascript.ts","../src/lib/abstract-ops/miscellaneous.ts","../src/lib/abstract-ops/queue-with-sizes.ts","../src/lib/readable-stream/byte-stream-controller.ts","../src/lib/readable-stream/byob-reader.ts","../src/lib/abstract-ops/queuing-strategy.ts","../src/lib/validators/queuing-strategy.ts","../src/lib/validators/underlying-sink.ts","../src/lib/validators/writable-stream.ts","../src/lib/abort-signal.ts","../src/lib/writable-stream.ts","../src/stub/native.ts","../src/stub/dom-exception.ts","../src/lib/readable-stream/pipe.ts","../src/lib/readable-stream/default-controller.ts","../src/lib/readable-stream/tee.ts","../src/lib/validators/underlying-source.ts","../src/lib/validators/reader-options.ts","../src/lib/validators/iterator-options.ts","../src/lib/validators/pipe-options.ts","../src/lib/validators/readable-writable-pair.ts","../src/lib/readable-stream.ts","../src/lib/validators/queuing-strategy-init.ts","../src/lib/byte-length-queuing-strategy.ts","../src/lib/count-queuing-strategy.ts","../src/lib/validators/transformer.ts","../src/lib/transform-stream.ts","../src/polyfill.ts"],"sourcesContent":["/// <reference lib=\"es2015.symbol\" />\n\nconst SymbolPolyfill: (description?: string) => symbol =\n  typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol' ?\n    Symbol :\n    description => `Symbol(${description})` as any as symbol;\n\nexport default SymbolPolyfill;\n","/// <reference lib=\"dom\" />\n\nexport function noop(): undefined {\n  return undefined;\n}\n\nfunction getGlobals() {\n  if (typeof self !== 'undefined') {\n    return self;\n  } else if (typeof window !== 'undefined') {\n    return window;\n  } else if (typeof global !== 'undefined') {\n    return global;\n  }\n  return undefined;\n}\n\nexport const globals = getGlobals();\n","import { noop } from '../../utils';\nimport { AssertionError } from '../../stub/assert';\n\nexport function typeIsObject(x: any): x is object {\n  return (typeof x === 'object' && x !== null) || typeof x === 'function';\n}\n\nexport const rethrowAssertionErrorRejection: (e: any) => void =\n  DEBUG ? e => {\n    // Used throughout the reference implementation, as `.catch(rethrowAssertionErrorRejection)`, to ensure any errors\n    // get shown. There are places in the spec where we do promise transformations and purposefully ignore or don't\n    // expect any errors, but assertion errors are always problematic.\n    if (e && e instanceof AssertionError) {\n      setTimeout(() => {\n        throw e;\n      }, 0);\n    }\n  } : noop;\n","import { globals } from '../../utils';\nimport { rethrowAssertionErrorRejection } from './miscellaneous';\nimport assert from '../../stub/assert';\n\nconst originalPromise = Promise;\nconst originalPromiseThen = Promise.prototype.then;\nconst originalPromiseResolve = Promise.resolve.bind(originalPromise);\nconst originalPromiseReject = Promise.reject.bind(originalPromise);\n\nexport function newPromise<T>(executor: (\n  resolve: (value: T | PromiseLike<T>) => void,\n  reject: (reason?: any) => void\n) => void): Promise<T> {\n  return new originalPromise(executor);\n}\n\nexport function promiseResolvedWith<T>(value: T | PromiseLike<T>): Promise<T> {\n  return originalPromiseResolve(value);\n}\n\nexport function promiseRejectedWith<T = never>(reason: any): Promise<T> {\n  return originalPromiseReject(reason);\n}\n\nexport function PerformPromiseThen<T, TResult1 = T, TResult2 = never>(\n  promise: Promise<T>,\n  onFulfilled?: (value: T) => TResult1 | PromiseLike<TResult1>,\n  onRejected?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2> {\n  // There doesn't appear to be any way to correctly emulate the behaviour from JavaScript, so this is just an\n  // approximation.\n  return originalPromiseThen.call(promise, onFulfilled, onRejected) as Promise<TResult1 | TResult2>;\n}\n\nexport function uponPromise<T>(\n  promise: Promise<T>,\n  onFulfilled?: (value: T) => void | PromiseLike<void>,\n  onRejected?: (reason: any) => void | PromiseLike<void>): void {\n  PerformPromiseThen(\n    PerformPromiseThen(promise, onFulfilled, onRejected),\n    undefined,\n    rethrowAssertionErrorRejection\n  );\n}\n\nexport function uponFulfillment<T>(promise: Promise<T>, onFulfilled: (value: T) => void | PromiseLike<void>): void {\n  uponPromise(promise, onFulfilled);\n}\n\nexport function uponRejection(promise: Promise<unknown>, onRejected: (reason: any) => void | PromiseLike<void>): void {\n  uponPromise(promise, undefined, onRejected);\n}\n\nexport function transformPromiseWith<T, TResult1 = T, TResult2 = never>(\n  promise: Promise<T>,\n  fulfillmentHandler?: (value: T) => TResult1 | PromiseLike<TResult1>,\n  rejectionHandler?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2> {\n  return PerformPromiseThen(promise, fulfillmentHandler, rejectionHandler);\n}\n\nexport function setPromiseIsHandledToTrue(promise: Promise<unknown>): void {\n  PerformPromiseThen(promise, undefined, rethrowAssertionErrorRejection);\n}\n\nexport const queueMicrotask: (fn: () => void) => void = (() => {\n  const globalQueueMicrotask = globals && globals.queueMicrotask;\n  if (typeof globalQueueMicrotask === 'function') {\n    return globalQueueMicrotask;\n  }\n\n  const resolvedPromise = promiseResolvedWith(undefined);\n  return (fn: () => void) => PerformPromiseThen(resolvedPromise, fn);\n})();\n\nexport function reflectCall<T, A extends any[], R>(F: (this: T, ...fnArgs: A) => R, V: T, args: A): R {\n  if (typeof F !== 'function') {\n    throw new TypeError('Argument is not a function');\n  }\n  return Function.prototype.apply.call(F, V, args);\n}\n\nexport function promiseCall<T, A extends any[], R>(F: (this: T, ...fnArgs: A) => R | PromiseLike<R>,\n                                                   V: T,\n                                                   args: A): Promise<R> {\n  assert(typeof F === 'function');\n  assert(V !== undefined);\n  assert(Array.isArray(args));\n  try {\n    return promiseResolvedWith(reflectCall(F, V, args));\n  } catch (value) {\n    return promiseRejectedWith(value);\n  }\n}\n","import assert from '../stub/assert';\n\n// Original from Chromium\n// https://chromium.googlesource.com/chromium/src/+/0aee4434a4dba42a42abaea9bfbc0cd196a63bc1/third_party/blink/renderer/core/streams/SimpleQueue.js\n\nconst QUEUE_MAX_ARRAY_SIZE = 16384;\n\ninterface Node<T> {\n  _elements: T[];\n  _next: Node<T> | undefined;\n}\n\n/**\n * Simple queue structure.\n *\n * Avoids scalability issues with using a packed array directly by using\n * multiple arrays in a linked list and keeping the array size bounded.\n */\nexport class SimpleQueue<T> {\n  private _front: Node<T>;\n  private _back: Node<T>;\n  private _cursor = 0;\n  private _size = 0;\n\n  constructor() {\n    // _front and _back are always defined.\n    this._front = {\n      _elements: [],\n      _next: undefined\n    };\n    this._back = this._front;\n    // The cursor is used to avoid calling Array.shift().\n    // It contains the index of the front element of the array inside the\n    // front-most node. It is always in the range [0, QUEUE_MAX_ARRAY_SIZE).\n    this._cursor = 0;\n    // When there is only one node, size === elements.length - cursor.\n    this._size = 0;\n  }\n\n  get length(): number {\n    return this._size;\n  }\n\n  // For exception safety, this method is structured in order:\n  // 1. Read state\n  // 2. Calculate required state mutations\n  // 3. Perform state mutations\n  push(element: T): void {\n    const oldBack = this._back;\n    let newBack = oldBack;\n    assert(oldBack._next === undefined);\n    if (oldBack._elements.length === QUEUE_MAX_ARRAY_SIZE - 1) {\n      newBack = {\n        _elements: [],\n        _next: undefined\n      };\n    }\n\n    // push() is the mutation most likely to throw an exception, so it\n    // goes first.\n    oldBack._elements.push(element);\n    if (newBack !== oldBack) {\n      this._back = newBack;\n      oldBack._next = newBack;\n    }\n    ++this._size;\n  }\n\n  // Like push(), shift() follows the read -> calculate -> mutate pattern for\n  // exception safety.\n  shift(): T {\n    assert(this._size > 0); // must not be called on an empty queue\n\n    const oldFront = this._front;\n    let newFront = oldFront;\n    const oldCursor = this._cursor;\n    let newCursor = oldCursor + 1;\n\n    const elements = oldFront._elements;\n    const element = elements[oldCursor];\n\n    if (newCursor === QUEUE_MAX_ARRAY_SIZE) {\n      assert(elements.length === QUEUE_MAX_ARRAY_SIZE);\n      assert(oldFront._next !== undefined);\n      newFront = oldFront._next!;\n      newCursor = 0;\n    }\n\n    // No mutations before this point.\n    --this._size;\n    this._cursor = newCursor;\n    if (oldFront !== newFront) {\n      this._front = newFront;\n    }\n\n    // Permit shifted element to be garbage collected.\n    elements[oldCursor] = undefined!;\n\n    return element;\n  }\n\n  // The tricky thing about forEach() is that it can be called\n  // re-entrantly. The queue may be mutated inside the callback. It is easy to\n  // see that push() within the callback has no negative effects since the end\n  // of the queue is checked for on every iteration. If shift() is called\n  // repeatedly within the callback then the next iteration may return an\n  // element that has been removed. In this case the callback will be called\n  // with undefined values until we either \"catch up\" with elements that still\n  // exist or reach the back of the queue.\n  forEach(callback: (element: T) => void): void {\n    let i = this._cursor;\n    let node = this._front;\n    let elements = node._elements;\n    while (i !== elements.length || node._next !== undefined) {\n      if (i === elements.length) {\n        assert(node._next !== undefined);\n        assert(i === QUEUE_MAX_ARRAY_SIZE);\n        node = node._next!;\n        elements = node._elements;\n        i = 0;\n        if (elements.length === 0) {\n          break;\n        }\n      }\n      callback(elements[i]);\n      ++i;\n    }\n  }\n\n  // Return the element that would be returned if shift() was called now,\n  // without modifying the queue.\n  peek(): T {\n    assert(this._size > 0); // must not be called on an empty queue\n\n    const front = this._front;\n    const cursor = this._cursor;\n    return front._elements[cursor];\n  }\n}\n","import assert from '../../stub/assert';\nimport { ReadableStream, ReadableStreamCancel, ReadableStreamReader } from '../readable-stream';\nimport { newPromise, setPromiseIsHandledToTrue } from '../helpers/webidl';\n\nexport function ReadableStreamReaderGenericInitialize<R>(reader: ReadableStreamReader<R>, stream: ReadableStream<R>) {\n  reader._ownerReadableStream = stream;\n  stream._reader = reader;\n\n  if (stream._state === 'readable') {\n    defaultReaderClosedPromiseInitialize(reader);\n  } else if (stream._state === 'closed') {\n    defaultReaderClosedPromiseInitializeAsResolved(reader);\n  } else {\n    assert(stream._state === 'errored');\n\n    defaultReaderClosedPromiseInitializeAsRejected(reader, stream._storedError);\n  }\n}\n\n// A client of ReadableStreamDefaultReader and ReadableStreamBYOBReader may use these functions directly to bypass state\n// check.\n\nexport function ReadableStreamReaderGenericCancel(reader: ReadableStreamReader<any>, reason: any): Promise<undefined> {\n  const stream = reader._ownerReadableStream;\n  assert(stream !== undefined);\n  return ReadableStreamCancel(stream, reason);\n}\n\nexport function ReadableStreamReaderGenericRelease(reader: ReadableStreamReader<any>) {\n  assert(reader._ownerReadableStream !== undefined);\n  assert(reader._ownerReadableStream._reader === reader);\n\n  if (reader._ownerReadableStream._state === 'readable') {\n    defaultReaderClosedPromiseReject(\n      reader,\n      new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));\n  } else {\n    defaultReaderClosedPromiseResetToRejected(\n      reader,\n      new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));\n  }\n\n  reader._ownerReadableStream._reader = undefined;\n  reader._ownerReadableStream = undefined!;\n}\n\n// Helper functions for the readers.\n\nexport function readerLockException(name: string): TypeError {\n  return new TypeError('Cannot ' + name + ' a stream using a released reader');\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nexport function defaultReaderClosedPromiseInitialize(reader: ReadableStreamReader<any>) {\n  reader._closedPromise = newPromise((resolve, reject) => {\n    reader._closedPromise_resolve = resolve;\n    reader._closedPromise_reject = reject;\n  });\n}\n\nexport function defaultReaderClosedPromiseInitializeAsRejected(reader: ReadableStreamReader<any>, reason: any) {\n  defaultReaderClosedPromiseInitialize(reader);\n  defaultReaderClosedPromiseReject(reader, reason);\n}\n\nexport function defaultReaderClosedPromiseInitializeAsResolved(reader: ReadableStreamReader<any>) {\n  defaultReaderClosedPromiseInitialize(reader);\n  defaultReaderClosedPromiseResolve(reader);\n}\n\nexport function defaultReaderClosedPromiseReject(reader: ReadableStreamReader<any>, reason: any) {\n  if (reader._closedPromise_reject === undefined) {\n    return;\n  }\n\n  setPromiseIsHandledToTrue(reader._closedPromise);\n  reader._closedPromise_reject(reason);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n\nexport function defaultReaderClosedPromiseResetToRejected(reader: ReadableStreamReader<any>, reason: any) {\n  assert(reader._closedPromise_resolve === undefined);\n  assert(reader._closedPromise_reject === undefined);\n\n  defaultReaderClosedPromiseInitializeAsRejected(reader, reason);\n}\n\nexport function defaultReaderClosedPromiseResolve(reader: ReadableStreamReader<any>) {\n  if (reader._closedPromise_resolve === undefined) {\n    return;\n  }\n\n  reader._closedPromise_resolve(undefined);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n","export const AbortSteps = Symbol('[[AbortSteps]]');\nexport const ErrorSteps = Symbol('[[ErrorSteps]]');\nexport const CancelSteps = Symbol('[[CancelSteps]]');\nexport const PullSteps = Symbol('[[PullSteps]]');\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite#Polyfill\nconst NumberIsFinite: typeof Number.isFinite = Number.isFinite || function (x) {\n  return typeof x === 'number' && isFinite(x);\n};\n\nexport default NumberIsFinite;\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc#Polyfill\nconst MathTrunc: typeof Math.trunc = Math.trunc || function (v) {\n  return v < 0 ? Math.ceil(v) : Math.floor(v);\n};\n\nexport default MathTrunc;\n","import NumberIsFinite from '../../stub/number-isfinite';\nimport MathTrunc from '../../stub/math-trunc';\n\n// https://heycam.github.io/webidl/#idl-dictionaries\nexport function isDictionary(x: any): x is object | null {\n  return typeof x === 'object' || typeof x === 'function';\n}\n\nexport function assertDictionary(obj: unknown,\n                                 context: string): asserts obj is object | null | undefined {\n  if (obj !== undefined && !isDictionary(obj)) {\n    throw new TypeError(`${context} is not an object.`);\n  }\n}\n\nexport type AnyFunction = (...args: any[]) => any;\n\n// https://heycam.github.io/webidl/#idl-callback-functions\nexport function assertFunction(x: unknown, context: string): asserts x is AnyFunction {\n  if (typeof x !== 'function') {\n    throw new TypeError(`${context} is not a function.`);\n  }\n}\n\n// https://heycam.github.io/webidl/#idl-object\nexport function isObject(x: any): x is object {\n  return (typeof x === 'object' && x !== null) || typeof x === 'function';\n}\n\nexport function assertObject(x: unknown,\n                             context: string): asserts x is object {\n  if (!isObject(x)) {\n    throw new TypeError(`${context} is not an object.`);\n  }\n}\n\nexport function assertRequiredArgument<T extends any>(x: T | undefined,\n                                                      position: number,\n                                                      context: string): asserts x is T {\n  if (x === undefined) {\n    throw new TypeError(`Parameter ${position} is required in '${context}'.`);\n  }\n}\n\nexport function assertRequiredField<T extends any>(x: T | undefined,\n                                                   field: string,\n                                                   context: string): asserts x is T {\n  if (x === undefined) {\n    throw new TypeError(`${field} is required in '${context}'.`);\n  }\n}\n\n// https://heycam.github.io/webidl/#idl-unrestricted-double\nexport function convertUnrestrictedDouble(value: unknown): number {\n  return Number(value);\n}\n\nfunction censorNegativeZero(x: number): number {\n  return x === 0 ? 0 : x;\n}\n\nfunction integerPart(x: number): number {\n  return censorNegativeZero(MathTrunc(x));\n}\n\n// https://heycam.github.io/webidl/#idl-unsigned-long-long\nexport function convertUnsignedLongLongWithEnforceRange(value: unknown, context: string): number {\n  const lowerBound = 0;\n  const upperBound = Number.MAX_SAFE_INTEGER;\n\n  let x = Number(value);\n  x = censorNegativeZero(x);\n\n  if (!NumberIsFinite(x)) {\n    throw new TypeError(`${context} is not a finite number`);\n  }\n\n  x = integerPart(x);\n\n  if (x < lowerBound || x > upperBound) {\n    throw new TypeError(`${context} is outside the accepted range of ${lowerBound} to ${upperBound}, inclusive`);\n  }\n\n  if (!NumberIsFinite(x) || x === 0) {\n    return 0;\n  }\n\n  // TODO Use BigInt if supported?\n  // let xBigInt = BigInt(integerPart(x));\n  // xBigInt = BigInt.asUintN(64, xBigInt);\n  // return Number(xBigInt);\n\n  return x;\n}\n","import { IsReadableStream, ReadableStream } from '../readable-stream';\n\nexport function assertReadableStream(x: unknown, context: string): asserts x is ReadableStream {\n  if (!IsReadableStream(x)) {\n    throw new TypeError(`${context} is not a ReadableStream.`);\n  }\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericInitialize,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport { IsReadableStreamLocked, ReadableStream } from '../readable-stream';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { PullSteps } from '../abstract-ops/internal-methods';\nimport { newPromise, promiseRejectedWith } from '../helpers/webidl';\nimport { assertRequiredArgument } from '../validators/basic';\nimport { assertReadableStream } from '../validators/readable-stream';\n\n/**\n * A result returned by {@link ReadableStreamDefaultReader.read}.\n *\n * @public\n */\nexport type ReadableStreamDefaultReadResult<T> = {\n  done: false;\n  value: T;\n} | {\n  done: true;\n  value?: undefined;\n}\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamDefaultReader<R>(stream: ReadableStream): ReadableStreamDefaultReader<R> {\n  return new ReadableStreamDefaultReader(stream);\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamAddReadRequest<R>(stream: ReadableStream<R>,\n                                                readRequest: ReadRequest<R>): void {\n  assert(IsReadableStreamDefaultReader(stream._reader));\n  assert(stream._state === 'readable');\n\n  (stream._reader! as ReadableStreamDefaultReader<R>)._readRequests.push(readRequest);\n}\n\nexport function ReadableStreamFulfillReadRequest<R>(stream: ReadableStream<R>, chunk: R | undefined, done: boolean) {\n  const reader = stream._reader as ReadableStreamDefaultReader<R>;\n\n  assert(reader._readRequests.length > 0);\n\n  const readRequest = reader._readRequests.shift()!;\n  if (done) {\n    readRequest._closeSteps();\n  } else {\n    readRequest._chunkSteps(chunk!);\n  }\n}\n\nexport function ReadableStreamGetNumReadRequests<R>(stream: ReadableStream<R>): number {\n  return (stream._reader as ReadableStreamDefaultReader<R>)._readRequests.length;\n}\n\nexport function ReadableStreamHasDefaultReader(stream: ReadableStream): boolean {\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return false;\n  }\n\n  if (!IsReadableStreamDefaultReader(reader)) {\n    return false;\n  }\n\n  return true;\n}\n\n// Readers\n\nexport interface ReadRequest<R> {\n  _chunkSteps(chunk: R): void;\n\n  _closeSteps(): void;\n\n  _errorSteps(e: any): void;\n}\n\n/**\n * A default reader vended by a {@link ReadableStream}.\n *\n * @public\n */\nexport class ReadableStreamDefaultReader<R = any> {\n  /** @internal */\n  _ownerReadableStream!: ReadableStream<R>;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readRequests: SimpleQueue<ReadRequest<R>>;\n\n  constructor(stream: ReadableStream<R>) {\n    assertRequiredArgument(stream, 1, 'ReadableStreamDefaultReader');\n    assertReadableStream(stream, 'First parameter');\n\n    if (IsReadableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n    }\n\n    ReadableStreamReaderGenericInitialize(this, stream);\n\n    this._readRequests = new SimpleQueue();\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed,\n   * or rejected if the stream ever errors or the reader's lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('cancel'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('cancel'));\n    }\n\n    return ReadableStreamReaderGenericCancel(this, reason);\n  }\n\n  /**\n   * Returns a promise that allows access to the next chunk from the stream's internal queue, if available.\n   *\n   * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.\n   */\n  read(): Promise<ReadableStreamDefaultReadResult<R>> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('read'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('read from'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamDefaultReadResult<R>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamDefaultReadResult<R>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),\n      _closeSteps: () => resolvePromise({ value: undefined, done: true }),\n      _errorSteps: e => rejectPromise(e)\n    };\n    ReadableStreamDefaultReaderRead(this, readRequest);\n    return promise;\n  }\n\n  /**\n   * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.\n   * If the associated stream is errored when the lock is released, the reader will appear errored in the same way\n   * from now on; otherwise, the reader will appear closed.\n   *\n   * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by\n   * the reader's {@link ReadableStreamDefaultReader.read | read()} method has not yet been settled. Attempting to\n   * do so will throw a `TypeError` and leave the reader locked to the stream.\n   */\n  releaseLock(): void {\n    if (!IsReadableStreamDefaultReader(this)) {\n      throw defaultReaderBrandCheckException('releaseLock');\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return;\n    }\n\n    if (this._readRequests.length > 0) {\n      throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n    }\n\n    ReadableStreamReaderGenericRelease(this);\n  }\n}\n\nObject.defineProperties(ReadableStreamDefaultReader.prototype, {\n  cancel: { enumerable: true },\n  read: { enumerable: true },\n  releaseLock: { enumerable: true },\n  closed: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamDefaultReader.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamDefaultReader',\n    configurable: true\n  });\n}\n\n// Abstract operations for the readers.\n\nexport function IsReadableStreamDefaultReader<R = any>(x: any): x is ReadableStreamDefaultReader<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readRequests')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamDefaultReader;\n}\n\nexport function ReadableStreamDefaultReaderRead<R>(reader: ReadableStreamDefaultReader<R>,\n                                                   readRequest: ReadRequest<R>): void {\n  const stream = reader._ownerReadableStream;\n\n  assert(stream !== undefined);\n\n  stream._disturbed = true;\n\n  if (stream._state === 'closed') {\n    readRequest._closeSteps();\n  } else if (stream._state === 'errored') {\n    readRequest._errorSteps(stream._storedError);\n  } else {\n    assert(stream._state === 'readable');\n    stream._readableStreamController[PullSteps](readRequest as ReadRequest<any>);\n  }\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nfunction defaultReaderBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamDefaultReader.prototype.${name} can only be used on a ReadableStreamDefaultReader`);\n}\n","/// <reference lib=\"es2018.asynciterable\" />\n\nexport let AsyncIteratorPrototype: AsyncIterable<any> | undefined;\n\nif (typeof Symbol.asyncIterator === 'symbol') {\n  // We're running inside a ES2018+ environment, but we're compiling to an older syntax.\n  // We cannot access %AsyncIteratorPrototype% without non-ES2018 syntax, but we can re-create it.\n  AsyncIteratorPrototype = {\n    // 25.1.3.1 %AsyncIteratorPrototype% [ @@asyncIterator ] ( )\n    // https://tc39.github.io/ecma262/#sec-asynciteratorprototype-asynciterator\n    [Symbol.asyncIterator](this: AsyncIterator<any>) {\n      return this;\n    }\n  };\n  Object.defineProperty(AsyncIteratorPrototype, Symbol.asyncIterator, { enumerable: false });\n}\n","/// <reference lib=\"es2018.asynciterable\" />\n\nimport { ReadableStream } from '../readable-stream';\nimport {\n  AcquireReadableStreamDefaultReader,\n  ReadableStreamDefaultReader,\n  ReadableStreamDefaultReaderRead,\n  ReadableStreamDefaultReadResult,\n  ReadRequest\n} from './default-reader';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport assert from '../../stub/assert';\nimport { AsyncIteratorPrototype } from '@@target/stub/async-iterator-prototype';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport {\n  newPromise,\n  promiseRejectedWith,\n  promiseResolvedWith,\n  queueMicrotask,\n  transformPromiseWith\n} from '../helpers/webidl';\n\n/**\n * An async iterator returned by {@link ReadableStream.values}.\n *\n * @public\n */\nexport interface ReadableStreamAsyncIterator<R> extends AsyncIterator<R> {\n  next(): Promise<IteratorResult<R, undefined>>;\n\n  return(value?: any): Promise<IteratorResult<any>>;\n}\n\nexport class ReadableStreamAsyncIteratorImpl<R> {\n  private readonly _reader: ReadableStreamDefaultReader<R>;\n  private readonly _preventCancel: boolean;\n  private _ongoingPromise: Promise<ReadableStreamDefaultReadResult<R>> | undefined = undefined;\n  private _isFinished = false;\n\n  constructor(reader: ReadableStreamDefaultReader<R>, preventCancel: boolean) {\n    this._reader = reader;\n    this._preventCancel = preventCancel;\n  }\n\n  next(): Promise<ReadableStreamDefaultReadResult<R>> {\n    const nextSteps = () => this._nextSteps();\n    this._ongoingPromise = this._ongoingPromise ?\n      transformPromiseWith(this._ongoingPromise, nextSteps, nextSteps) :\n      nextSteps();\n    return this._ongoingPromise;\n  }\n\n  return(value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    const returnSteps = () => this._returnSteps(value);\n    return this._ongoingPromise ?\n      transformPromiseWith(this._ongoingPromise, returnSteps, returnSteps) :\n      returnSteps();\n  }\n\n  private _nextSteps(): Promise<ReadableStreamDefaultReadResult<R>> {\n    if (this._isFinished) {\n      return Promise.resolve({ value: undefined, done: true });\n    }\n\n    const reader = this._reader;\n    if (reader._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('iterate'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamDefaultReadResult<R>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamDefaultReadResult<R>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => {\n        this._ongoingPromise = undefined;\n        // This needs to be delayed by one microtask, otherwise we stop pulling too early which breaks a test.\n        // FIXME Is this a bug in the specification, or in the test?\n        queueMicrotask(() => resolvePromise({ value: chunk, done: false }));\n      },\n      _closeSteps: () => {\n        this._ongoingPromise = undefined;\n        this._isFinished = true;\n        ReadableStreamReaderGenericRelease(reader);\n        resolvePromise({ value: undefined, done: true });\n      },\n      _errorSteps: reason => {\n        this._ongoingPromise = undefined;\n        this._isFinished = true;\n        ReadableStreamReaderGenericRelease(reader);\n        rejectPromise(reason);\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n    return promise;\n  }\n\n  private _returnSteps(value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (this._isFinished) {\n      return Promise.resolve({ value, done: true });\n    }\n    this._isFinished = true;\n\n    const reader = this._reader;\n    if (reader._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('finish iterating'));\n    }\n\n    assert(reader._readRequests.length === 0);\n\n    if (!this._preventCancel) {\n      const result = ReadableStreamReaderGenericCancel(reader, value);\n      ReadableStreamReaderGenericRelease(reader);\n      return transformPromiseWith(result, () => ({ value, done: true }));\n    }\n\n    ReadableStreamReaderGenericRelease(reader);\n    return promiseResolvedWith({ value, done: true });\n  }\n}\n\ndeclare class ReadableStreamAsyncIteratorInstance<R> implements ReadableStreamAsyncIterator<R> {\n  /** @interal */\n  _asyncIteratorImpl: ReadableStreamAsyncIteratorImpl<R>;\n\n  next(): Promise<IteratorResult<R, undefined>>;\n\n  return(value?: any): Promise<IteratorResult<any>>;\n}\n\nconst ReadableStreamAsyncIteratorPrototype: ReadableStreamAsyncIteratorInstance<any> = {\n  next(this: ReadableStreamAsyncIteratorInstance<any>): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (!IsReadableStreamAsyncIterator(this)) {\n      return promiseRejectedWith(streamAsyncIteratorBrandCheckException('next'));\n    }\n    return this._asyncIteratorImpl.next();\n  },\n\n  return(this: ReadableStreamAsyncIteratorInstance<any>, value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (!IsReadableStreamAsyncIterator(this)) {\n      return promiseRejectedWith(streamAsyncIteratorBrandCheckException('return'));\n    }\n    return this._asyncIteratorImpl.return(value);\n  }\n} as any;\nif (AsyncIteratorPrototype !== undefined) {\n  Object.setPrototypeOf(ReadableStreamAsyncIteratorPrototype, AsyncIteratorPrototype);\n}\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamAsyncIterator<R>(stream: ReadableStream<R>,\n                                                      preventCancel: boolean): ReadableStreamAsyncIterator<R> {\n  const reader = AcquireReadableStreamDefaultReader<R>(stream);\n  const impl = new ReadableStreamAsyncIteratorImpl(reader, preventCancel);\n  const iterator: ReadableStreamAsyncIteratorInstance<R> = Object.create(ReadableStreamAsyncIteratorPrototype);\n  iterator._asyncIteratorImpl = impl;\n  return iterator;\n}\n\nfunction IsReadableStreamAsyncIterator<R = any>(x: any): x is ReadableStreamAsyncIterator<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_asyncIteratorImpl')) {\n    return false;\n  }\n\n  try {\n    // noinspection SuspiciousTypeOfGuard\n    return (x as ReadableStreamAsyncIteratorInstance<any>)._asyncIteratorImpl instanceof\n      ReadableStreamAsyncIteratorImpl;\n  } catch {\n    return false;\n  }\n}\n\n// Helper functions for the ReadableStream.\n\nfunction streamAsyncIteratorBrandCheckException(name: string): TypeError {\n  return new TypeError(`ReadableStreamAsyncIterator.${name} can only be used on a ReadableSteamAsyncIterator`);\n}\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Polyfill\nconst NumberIsNaN: typeof Number.isNaN = Number.isNaN || function (x) {\n  // eslint-disable-next-line no-self-compare\n  return x !== x;\n};\n\nexport default NumberIsNaN;\n","export function CreateArrayFromList<T extends any[]>(elements: T): T {\n  // We use arrays to represent lists, so this is basically a no-op.\n  // Do a slice though just in case we happen to depend on the unique-ness.\n  return elements.slice() as T;\n}\n\nexport function CopyDataBlockBytes(dest: ArrayBuffer,\n                                   destOffset: number,\n                                   src: ArrayBuffer,\n                                   srcOffset: number,\n                                   n: number) {\n  new Uint8Array(dest).set(new Uint8Array(src, srcOffset, n), destOffset);\n}\n\n// Not implemented correctly\nexport function TransferArrayBuffer<T extends ArrayBufferLike>(O: T): T {\n  return O;\n}\n\n// Not implemented correctly\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nexport function CanTransferArrayBuffer(O: ArrayBufferLike): boolean {\n  return true;\n}\n\n// Not implemented correctly\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nexport function IsDetachedBuffer(O: ArrayBufferLike): boolean {\n  return false;\n}\n\nexport function ArrayBufferSlice(buffer: ArrayBufferLike, begin: number, end: number): ArrayBufferLike {\n  // ArrayBuffer.prototype.slice is not available on IE10\n  // https://www.caniuse.com/mdn-javascript_builtins_arraybuffer_slice\n  if (buffer.slice) {\n    return buffer.slice(begin, end);\n  }\n  const length = end - begin;\n  const slice = new ArrayBuffer(length);\n  CopyDataBlockBytes(slice, 0, buffer, begin, length);\n  return slice;\n}\n","import NumberIsNaN from '../../stub/number-isnan';\nimport { ArrayBufferSlice } from './ecmascript';\n\nexport function IsNonNegativeNumber(v: number): boolean {\n  if (typeof v !== 'number') {\n    return false;\n  }\n\n  if (NumberIsNaN(v)) {\n    return false;\n  }\n\n  if (v < 0) {\n    return false;\n  }\n\n  return true;\n}\n\nexport function CloneAsUint8Array(O: ArrayBufferView): Uint8Array {\n  const buffer = ArrayBufferSlice(O.buffer, O.byteOffset, O.byteOffset + O.byteLength);\n  return new Uint8Array(buffer);\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport { IsNonNegativeNumber } from './miscellaneous';\n\nexport interface QueueContainer<T> {\n  _queue: SimpleQueue<T>;\n  _queueTotalSize: number;\n}\n\nexport interface QueuePair<T> {\n  value: T;\n  size: number;\n}\n\nexport function DequeueValue<T>(container: QueueContainer<QueuePair<T>>): T {\n  assert('_queue' in container && '_queueTotalSize' in container);\n  assert(container._queue.length > 0);\n\n  const pair = container._queue.shift()!;\n  container._queueTotalSize -= pair.size;\n  if (container._queueTotalSize < 0) {\n    container._queueTotalSize = 0;\n  }\n\n  return pair.value;\n}\n\nexport function EnqueueValueWithSize<T>(container: QueueContainer<QueuePair<T>>, value: T, size: number) {\n  assert('_queue' in container && '_queueTotalSize' in container);\n\n  if (!IsNonNegativeNumber(size) || size === Infinity) {\n    throw new RangeError('Size must be a finite, non-NaN, non-negative number.');\n  }\n\n  container._queue.push({ value, size });\n  container._queueTotalSize += size;\n}\n\nexport function PeekQueueValue<T>(container: QueueContainer<QueuePair<T>>): T {\n  assert('_queue' in container && '_queueTotalSize' in container);\n  assert(container._queue.length > 0);\n\n  const pair = container._queue.peek();\n  return pair.value;\n}\n\nexport function ResetQueue<T>(container: QueueContainer<T>) {\n  assert('_queue' in container && '_queueTotalSize' in container);\n\n  container._queue = new SimpleQueue<T>();\n  container._queueTotalSize = 0;\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport { ResetQueue } from '../abstract-ops/queue-with-sizes';\nimport {\n  ReadableStreamAddReadRequest,\n  ReadableStreamFulfillReadRequest,\n  ReadableStreamGetNumReadRequests,\n  ReadableStreamHasDefaultReader,\n  ReadRequest\n} from './default-reader';\nimport {\n  ReadableStreamAddReadIntoRequest,\n  ReadableStreamFulfillReadIntoRequest,\n  ReadableStreamGetNumReadIntoRequests,\n  ReadableStreamHasBYOBReader,\n  ReadIntoRequest\n} from './byob-reader';\nimport NumberIsInteger from '../../stub/number-isinteger';\nimport {\n  IsReadableStreamLocked,\n  ReadableByteStream,\n  ReadableStreamClose,\n  ReadableStreamError\n} from '../readable-stream';\nimport { ValidatedUnderlyingByteSource } from './underlying-source';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport {\n  ArrayBufferSlice,\n  CanTransferArrayBuffer,\n  CopyDataBlockBytes,\n  IsDetachedBuffer,\n  TransferArrayBuffer\n} from '../abstract-ops/ecmascript';\nimport { CancelSteps, PullSteps } from '../abstract-ops/internal-methods';\nimport { promiseResolvedWith, uponPromise } from '../helpers/webidl';\nimport { assertRequiredArgument, convertUnsignedLongLongWithEnforceRange } from '../validators/basic';\n\n/**\n * A pull-into request in a {@link ReadableByteStreamController}.\n *\n * @public\n */\nexport class ReadableStreamBYOBRequest {\n  /** @internal */\n  _associatedReadableByteStreamController!: ReadableByteStreamController;\n  /** @internal */\n  _view!: ArrayBufferView | null;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the view for writing in to, or `null` if the BYOB request has already been responded to.\n   */\n  get view(): ArrayBufferView | null {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('view');\n    }\n\n    return this._view;\n  }\n\n  /**\n   * Indicates to the associated readable byte stream that `bytesWritten` bytes were written into\n   * {@link ReadableStreamBYOBRequest.view | view}, causing the result be surfaced to the consumer.\n   *\n   * After this method is called, {@link ReadableStreamBYOBRequest.view | view} will be transferred and no longer\n   * modifiable.\n   */\n  respond(bytesWritten: number): void;\n  respond(bytesWritten: number | undefined): void {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('respond');\n    }\n    assertRequiredArgument(bytesWritten, 1, 'respond');\n    bytesWritten = convertUnsignedLongLongWithEnforceRange(bytesWritten, 'First parameter');\n\n    if (this._associatedReadableByteStreamController === undefined) {\n      throw new TypeError('This BYOB request has been invalidated');\n    }\n\n    if (IsDetachedBuffer(this._view!.buffer)) {\n      throw new TypeError(`The BYOB request's buffer has been detached and so cannot be used as a response`);\n    }\n\n    assert(this._view!.byteLength > 0);\n    assert(this._view!.buffer.byteLength > 0);\n\n    ReadableByteStreamControllerRespond(this._associatedReadableByteStreamController, bytesWritten);\n  }\n\n  /**\n   * Indicates to the associated readable byte stream that instead of writing into\n   * {@link ReadableStreamBYOBRequest.view | view}, the underlying byte source is providing a new `ArrayBufferView`,\n   * which will be given to the consumer of the readable byte stream.\n   *\n   * After this method is called, `view` will be transferred and no longer modifiable.\n   */\n  respondWithNewView(view: ArrayBufferView): void;\n  respondWithNewView(view: ArrayBufferView | undefined): void {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('respondWithNewView');\n    }\n    assertRequiredArgument(view, 1, 'respondWithNewView');\n\n    if (!ArrayBuffer.isView(view)) {\n      throw new TypeError('You can only respond with array buffer views');\n    }\n\n    if (this._associatedReadableByteStreamController === undefined) {\n      throw new TypeError('This BYOB request has been invalidated');\n    }\n\n    if (IsDetachedBuffer(view.buffer)) {\n      throw new TypeError('The given view\\'s buffer has been detached and so cannot be used as a response');\n    }\n\n    ReadableByteStreamControllerRespondWithNewView(this._associatedReadableByteStreamController, view);\n  }\n}\n\nObject.defineProperties(ReadableStreamBYOBRequest.prototype, {\n  respond: { enumerable: true },\n  respondWithNewView: { enumerable: true },\n  view: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamBYOBRequest.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamBYOBRequest',\n    configurable: true\n  });\n}\n\ninterface ArrayBufferViewConstructor<T extends ArrayBufferView = ArrayBufferView> {\n  new(buffer: ArrayBufferLike, byteOffset: number, length?: number): T;\n\n  readonly prototype: T;\n  readonly BYTES_PER_ELEMENT: number;\n}\n\ninterface ByteQueueElement {\n  buffer: ArrayBufferLike;\n  byteOffset: number;\n  byteLength: number;\n}\n\ntype PullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> =\n  DefaultPullIntoDescriptor\n  | BYOBPullIntoDescriptor<T>;\n\ninterface DefaultPullIntoDescriptor {\n  buffer: ArrayBufferLike;\n  bufferByteLength: number;\n  byteOffset: number;\n  byteLength: number;\n  bytesFilled: number;\n  elementSize: number;\n  viewConstructor: ArrayBufferViewConstructor<Uint8Array>;\n  readerType: 'default';\n}\n\ninterface BYOBPullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> {\n  buffer: ArrayBufferLike;\n  bufferByteLength: number;\n  byteOffset: number;\n  byteLength: number;\n  bytesFilled: number;\n  elementSize: number;\n  viewConstructor: ArrayBufferViewConstructor<T>;\n  readerType: 'byob';\n}\n\n/**\n * Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue.\n *\n * @public\n */\nexport class ReadableByteStreamController {\n  /** @internal */\n  _controlledReadableByteStream!: ReadableByteStream;\n  /** @internal */\n  _queue!: SimpleQueue<ByteQueueElement>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _closeRequested!: boolean;\n  /** @internal */\n  _pullAgain!: boolean;\n  /** @internal */\n  _pulling !: boolean;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _pullAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _cancelAlgorithm!: (reason: any) => Promise<void>;\n  /** @internal */\n  _autoAllocateChunkSize: number | undefined;\n  /** @internal */\n  _byobRequest: ReadableStreamBYOBRequest | null;\n  /** @internal */\n  _pendingPullIntos!: SimpleQueue<PullIntoDescriptor>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the current BYOB pull request, or `null` if there isn't one.\n   */\n  get byobRequest(): ReadableStreamBYOBRequest | null {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('byobRequest');\n    }\n\n    return ReadableByteStreamControllerGetBYOBRequest(this);\n  }\n\n  /**\n   * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is\n   * over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure.\n   */\n  get desiredSize(): number | null {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('desiredSize');\n    }\n\n    return ReadableByteStreamControllerGetDesiredSize(this);\n  }\n\n  /**\n   * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from\n   * the stream, but once those are read, the stream will become closed.\n   */\n  close(): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('close');\n    }\n\n    if (this._closeRequested) {\n      throw new TypeError('The stream has already been closed; do not close it again!');\n    }\n\n    const state = this._controlledReadableByteStream._state;\n    if (state !== 'readable') {\n      throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be closed`);\n    }\n\n    ReadableByteStreamControllerClose(this);\n  }\n\n  /**\n   * Enqueues the given chunk chunk in the controlled readable stream.\n   * The chunk has to be an `ArrayBufferView` instance, or else a `TypeError` will be thrown.\n   */\n  enqueue(chunk: ArrayBufferView): void;\n  enqueue(chunk: ArrayBufferView | undefined): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('enqueue');\n    }\n\n    assertRequiredArgument(chunk, 1, 'enqueue');\n    if (!ArrayBuffer.isView(chunk)) {\n      throw new TypeError('chunk must be an array buffer view');\n    }\n    if (chunk.byteLength === 0) {\n      throw new TypeError('chunk must have non-zero byteLength');\n    }\n    if (chunk.buffer.byteLength === 0) {\n      throw new TypeError(`chunk's buffer must have non-zero byteLength`);\n    }\n\n    if (this._closeRequested) {\n      throw new TypeError('stream is closed or draining');\n    }\n\n    const state = this._controlledReadableByteStream._state;\n    if (state !== 'readable') {\n      throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be enqueued to`);\n    }\n\n    ReadableByteStreamControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.\n   */\n  error(e: any = undefined): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('error');\n    }\n\n    ReadableByteStreamControllerError(this, e);\n  }\n\n  /** @internal */\n  [CancelSteps](reason: any): Promise<void> {\n    ReadableByteStreamControllerClearPendingPullIntos(this);\n\n    ResetQueue(this);\n\n    const result = this._cancelAlgorithm(reason);\n    ReadableByteStreamControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [PullSteps](readRequest: ReadRequest<Uint8Array>): void {\n    const stream = this._controlledReadableByteStream;\n    assert(ReadableStreamHasDefaultReader(stream));\n\n    if (this._queueTotalSize > 0) {\n      assert(ReadableStreamGetNumReadRequests(stream) === 0);\n\n      const entry = this._queue.shift()!;\n      this._queueTotalSize -= entry.byteLength;\n\n      ReadableByteStreamControllerHandleQueueDrain(this);\n\n      const view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);\n\n      readRequest._chunkSteps(view);\n      return;\n    }\n\n    const autoAllocateChunkSize = this._autoAllocateChunkSize;\n    if (autoAllocateChunkSize !== undefined) {\n      let buffer: ArrayBuffer;\n      try {\n        buffer = new ArrayBuffer(autoAllocateChunkSize);\n      } catch (bufferE) {\n        readRequest._errorSteps(bufferE);\n        return;\n      }\n\n      const pullIntoDescriptor: DefaultPullIntoDescriptor = {\n        buffer,\n        bufferByteLength: autoAllocateChunkSize,\n        byteOffset: 0,\n        byteLength: autoAllocateChunkSize,\n        bytesFilled: 0,\n        elementSize: 1,\n        viewConstructor: Uint8Array,\n        readerType: 'default'\n      };\n\n      this._pendingPullIntos.push(pullIntoDescriptor);\n    }\n\n    ReadableStreamAddReadRequest(stream, readRequest);\n    ReadableByteStreamControllerCallPullIfNeeded(this);\n  }\n}\n\nObject.defineProperties(ReadableByteStreamController.prototype, {\n  close: { enumerable: true },\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  byobRequest: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableByteStreamController.prototype, Symbol.toStringTag, {\n    value: 'ReadableByteStreamController',\n    configurable: true\n  });\n}\n\n// Abstract operations for the ReadableByteStreamController.\n\nexport function IsReadableByteStreamController(x: any): x is ReadableByteStreamController {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableByteStream')) {\n    return false;\n  }\n\n  return x instanceof ReadableByteStreamController;\n}\n\nfunction IsReadableStreamBYOBRequest(x: any): x is ReadableStreamBYOBRequest {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_associatedReadableByteStreamController')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamBYOBRequest;\n}\n\nfunction ReadableByteStreamControllerCallPullIfNeeded(controller: ReadableByteStreamController): void {\n  const shouldPull = ReadableByteStreamControllerShouldCallPull(controller);\n  if (!shouldPull) {\n    return;\n  }\n\n  if (controller._pulling) {\n    controller._pullAgain = true;\n    return;\n  }\n\n  assert(!controller._pullAgain);\n\n  controller._pulling = true;\n\n  // TODO: Test controller argument\n  const pullPromise = controller._pullAlgorithm();\n  uponPromise(\n    pullPromise,\n    () => {\n      controller._pulling = false;\n\n      if (controller._pullAgain) {\n        controller._pullAgain = false;\n        ReadableByteStreamControllerCallPullIfNeeded(controller);\n      }\n    },\n    e => {\n      ReadableByteStreamControllerError(controller, e);\n    }\n  );\n}\n\nfunction ReadableByteStreamControllerClearPendingPullIntos(controller: ReadableByteStreamController) {\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n  controller._pendingPullIntos = new SimpleQueue();\n}\n\nfunction ReadableByteStreamControllerCommitPullIntoDescriptor<T extends ArrayBufferView>(\n  stream: ReadableByteStream,\n  pullIntoDescriptor: PullIntoDescriptor<T>\n) {\n  assert(stream._state !== 'errored');\n\n  let done = false;\n  if (stream._state === 'closed') {\n    assert(pullIntoDescriptor.bytesFilled === 0);\n    done = true;\n  }\n\n  const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);\n  if (pullIntoDescriptor.readerType === 'default') {\n    ReadableStreamFulfillReadRequest(stream, filledView as unknown as Uint8Array, done);\n  } else {\n    assert(pullIntoDescriptor.readerType === 'byob');\n    ReadableStreamFulfillReadIntoRequest(stream, filledView, done);\n  }\n}\n\nfunction ReadableByteStreamControllerConvertPullIntoDescriptor<T extends ArrayBufferView>(\n  pullIntoDescriptor: PullIntoDescriptor<T>\n): T {\n  const bytesFilled = pullIntoDescriptor.bytesFilled;\n  const elementSize = pullIntoDescriptor.elementSize;\n\n  assert(bytesFilled <= pullIntoDescriptor.byteLength);\n  assert(bytesFilled % elementSize === 0);\n\n  return new pullIntoDescriptor.viewConstructor(\n    pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize) as T;\n}\n\nfunction ReadableByteStreamControllerEnqueueChunkToQueue(controller: ReadableByteStreamController,\n                                                         buffer: ArrayBufferLike,\n                                                         byteOffset: number,\n                                                         byteLength: number) {\n  controller._queue.push({ buffer, byteOffset, byteLength });\n  controller._queueTotalSize += byteLength;\n}\n\nfunction ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller: ReadableByteStreamController,\n                                                                     pullIntoDescriptor: PullIntoDescriptor) {\n  const elementSize = pullIntoDescriptor.elementSize;\n\n  const currentAlignedBytes = pullIntoDescriptor.bytesFilled - pullIntoDescriptor.bytesFilled % elementSize;\n\n  const maxBytesToCopy = Math.min(controller._queueTotalSize,\n                                  pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled);\n  const maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;\n  const maxAlignedBytes = maxBytesFilled - maxBytesFilled % elementSize;\n\n  let totalBytesToCopyRemaining = maxBytesToCopy;\n  let ready = false;\n  if (maxAlignedBytes > currentAlignedBytes) {\n    totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled;\n    ready = true;\n  }\n\n  const queue = controller._queue;\n\n  while (totalBytesToCopyRemaining > 0) {\n    const headOfQueue = queue.peek();\n\n    const bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength);\n\n    const destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n    CopyDataBlockBytes(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy);\n\n    if (headOfQueue.byteLength === bytesToCopy) {\n      queue.shift();\n    } else {\n      headOfQueue.byteOffset += bytesToCopy;\n      headOfQueue.byteLength -= bytesToCopy;\n    }\n    controller._queueTotalSize -= bytesToCopy;\n\n    ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor);\n\n    totalBytesToCopyRemaining -= bytesToCopy;\n  }\n\n  if (!ready) {\n    assert(controller._queueTotalSize === 0);\n    assert(pullIntoDescriptor.bytesFilled > 0);\n    assert(pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize);\n  }\n\n  return ready;\n}\n\nfunction ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller: ReadableByteStreamController,\n                                                                size: number,\n                                                                pullIntoDescriptor: PullIntoDescriptor) {\n  assert(controller._pendingPullIntos.length === 0 || controller._pendingPullIntos.peek() === pullIntoDescriptor);\n  assert(controller._byobRequest === null);\n  pullIntoDescriptor.bytesFilled += size;\n}\n\nfunction ReadableByteStreamControllerHandleQueueDrain(controller: ReadableByteStreamController) {\n  assert(controller._controlledReadableByteStream._state === 'readable');\n\n  if (controller._queueTotalSize === 0 && controller._closeRequested) {\n    ReadableByteStreamControllerClearAlgorithms(controller);\n    ReadableStreamClose(controller._controlledReadableByteStream);\n  } else {\n    ReadableByteStreamControllerCallPullIfNeeded(controller);\n  }\n}\n\nfunction ReadableByteStreamControllerInvalidateBYOBRequest(controller: ReadableByteStreamController) {\n  if (controller._byobRequest === null) {\n    return;\n  }\n\n  controller._byobRequest._associatedReadableByteStreamController = undefined!;\n  controller._byobRequest._view = null!;\n  controller._byobRequest = null;\n}\n\nfunction ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller: ReadableByteStreamController) {\n  assert(!controller._closeRequested);\n\n  while (controller._pendingPullIntos.length > 0) {\n    if (controller._queueTotalSize === 0) {\n      return;\n    }\n\n    const pullIntoDescriptor = controller._pendingPullIntos.peek();\n\n    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {\n      ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n      ReadableByteStreamControllerCommitPullIntoDescriptor(\n        controller._controlledReadableByteStream,\n        pullIntoDescriptor\n      );\n    }\n  }\n}\n\nexport function ReadableByteStreamControllerPullInto<T extends ArrayBufferView>(\n  controller: ReadableByteStreamController,\n  view: T,\n  readIntoRequest: ReadIntoRequest<T>\n): void {\n  const stream = controller._controlledReadableByteStream;\n\n  let elementSize = 1;\n  if (view.constructor !== DataView) {\n    elementSize = (view.constructor as ArrayBufferViewConstructor<T>).BYTES_PER_ELEMENT;\n  }\n\n  const ctor = view.constructor as ArrayBufferViewConstructor<T>;\n\n  // try {\n  const buffer = TransferArrayBuffer(view.buffer);\n  // } catch (e) {\n  //   readIntoRequest._errorSteps(e);\n  //   return;\n  // }\n\n  const pullIntoDescriptor: BYOBPullIntoDescriptor<T> = {\n    buffer,\n    bufferByteLength: buffer.byteLength,\n    byteOffset: view.byteOffset,\n    byteLength: view.byteLength,\n    bytesFilled: 0,\n    elementSize,\n    viewConstructor: ctor,\n    readerType: 'byob'\n  };\n\n  if (controller._pendingPullIntos.length > 0) {\n    controller._pendingPullIntos.push(pullIntoDescriptor);\n\n    // No ReadableByteStreamControllerCallPullIfNeeded() call since:\n    // - No change happens on desiredSize\n    // - The source has already been notified of that there's at least 1 pending read(view)\n\n    ReadableStreamAddReadIntoRequest(stream, readIntoRequest);\n    return;\n  }\n\n  if (stream._state === 'closed') {\n    const emptyView = new ctor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0);\n    readIntoRequest._closeSteps(emptyView);\n    return;\n  }\n\n  if (controller._queueTotalSize > 0) {\n    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {\n      const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);\n\n      ReadableByteStreamControllerHandleQueueDrain(controller);\n\n      readIntoRequest._chunkSteps(filledView);\n      return;\n    }\n\n    if (controller._closeRequested) {\n      const e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n      ReadableByteStreamControllerError(controller, e);\n\n      readIntoRequest._errorSteps(e);\n      return;\n    }\n  }\n\n  controller._pendingPullIntos.push(pullIntoDescriptor);\n\n  ReadableStreamAddReadIntoRequest<T>(stream, readIntoRequest);\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nfunction ReadableByteStreamControllerRespondInClosedState(controller: ReadableByteStreamController,\n                                                          firstDescriptor: PullIntoDescriptor) {\n  assert(firstDescriptor.bytesFilled === 0);\n\n  const stream = controller._controlledReadableByteStream;\n  if (ReadableStreamHasBYOBReader(stream)) {\n    while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n      const pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);\n      ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);\n    }\n  }\n}\n\nfunction ReadableByteStreamControllerRespondInReadableState(controller: ReadableByteStreamController,\n                                                            bytesWritten: number,\n                                                            pullIntoDescriptor: PullIntoDescriptor) {\n  assert(pullIntoDescriptor.bytesFilled + bytesWritten <= pullIntoDescriptor.byteLength);\n\n  ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor);\n\n  if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {\n    return;\n  }\n\n  ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n  const remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize;\n  if (remainderSize > 0) {\n    const end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n    const remainder = ArrayBufferSlice(pullIntoDescriptor.buffer, end - remainderSize, end);\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength);\n  }\n\n  pullIntoDescriptor.bytesFilled -= remainderSize;\n  ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);\n\n  ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n}\n\nfunction ReadableByteStreamControllerRespondInternal(controller: ReadableByteStreamController, bytesWritten: number) {\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  assert(CanTransferArrayBuffer(firstDescriptor.buffer));\n\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n\n  const state = controller._controlledReadableByteStream._state;\n  if (state === 'closed') {\n    assert(bytesWritten === 0);\n    ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor);\n  } else {\n    assert(state === 'readable');\n    assert(bytesWritten > 0);\n    ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);\n  }\n\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nfunction ReadableByteStreamControllerShiftPendingPullInto(\n  controller: ReadableByteStreamController\n): PullIntoDescriptor {\n  assert(controller._byobRequest === null);\n  const descriptor = controller._pendingPullIntos.shift()!;\n  return descriptor;\n}\n\nfunction ReadableByteStreamControllerShouldCallPull(controller: ReadableByteStreamController): boolean {\n  const stream = controller._controlledReadableByteStream;\n\n  if (stream._state !== 'readable') {\n    return false;\n  }\n\n  if (controller._closeRequested) {\n    return false;\n  }\n\n  if (!controller._started) {\n    return false;\n  }\n\n  if (ReadableStreamHasDefaultReader(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    return true;\n  }\n\n  if (ReadableStreamHasBYOBReader(stream) && ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n    return true;\n  }\n\n  const desiredSize = ReadableByteStreamControllerGetDesiredSize(controller);\n  assert(desiredSize !== null);\n  if (desiredSize! > 0) {\n    return true;\n  }\n\n  return false;\n}\n\nfunction ReadableByteStreamControllerClearAlgorithms(controller: ReadableByteStreamController) {\n  controller._pullAlgorithm = undefined!;\n  controller._cancelAlgorithm = undefined!;\n}\n\n// A client of ReadableByteStreamController may use these functions directly to bypass state check.\n\nexport function ReadableByteStreamControllerClose(controller: ReadableByteStreamController) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (controller._closeRequested || stream._state !== 'readable') {\n    return;\n  }\n\n  if (controller._queueTotalSize > 0) {\n    controller._closeRequested = true;\n\n    return;\n  }\n\n  if (controller._pendingPullIntos.length > 0) {\n    const firstPendingPullInto = controller._pendingPullIntos.peek();\n    if (firstPendingPullInto.bytesFilled > 0) {\n      const e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n      ReadableByteStreamControllerError(controller, e);\n\n      throw e;\n    }\n  }\n\n  ReadableByteStreamControllerClearAlgorithms(controller);\n  ReadableStreamClose(stream);\n}\n\nexport function ReadableByteStreamControllerEnqueue(controller: ReadableByteStreamController, chunk: ArrayBufferView) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (controller._closeRequested || stream._state !== 'readable') {\n    return;\n  }\n\n  const buffer = chunk.buffer;\n  const byteOffset = chunk.byteOffset;\n  const byteLength = chunk.byteLength;\n  if (IsDetachedBuffer(buffer)) {\n    throw new TypeError('chunk\\'s buffer is detached and so cannot be enqueued');\n  }\n  const transferredBuffer = TransferArrayBuffer(buffer);\n\n  if (controller._pendingPullIntos.length > 0) {\n    const firstPendingPullInto = controller._pendingPullIntos.peek();\n    if (IsDetachedBuffer(firstPendingPullInto.buffer)) {\n      throw new TypeError(\n        'The BYOB request\\'s buffer has been detached and so cannot be filled with an enqueued chunk'\n      );\n    }\n    firstPendingPullInto.buffer = TransferArrayBuffer(firstPendingPullInto.buffer);\n  }\n\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n\n  if (ReadableStreamHasDefaultReader(stream)) {\n    if (ReadableStreamGetNumReadRequests(stream) === 0) {\n      assert(controller._pendingPullIntos.length === 0);\n      ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n    } else {\n      assert(controller._queue.length === 0);\n      if (controller._pendingPullIntos.length > 0) {\n        assert(controller._pendingPullIntos.peek().readerType === 'default');\n        ReadableByteStreamControllerShiftPendingPullInto(controller);\n      }\n      const transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength);\n      ReadableStreamFulfillReadRequest(stream, transferredView, false);\n    }\n  } else if (ReadableStreamHasBYOBReader(stream)) {\n    // TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully.\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n    ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n  } else {\n    assert(!IsReadableStreamLocked(stream));\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n  }\n\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nexport function ReadableByteStreamControllerError(controller: ReadableByteStreamController, e: any) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (stream._state !== 'readable') {\n    return;\n  }\n\n  ReadableByteStreamControllerClearPendingPullIntos(controller);\n\n  ResetQueue(controller);\n  ReadableByteStreamControllerClearAlgorithms(controller);\n  ReadableStreamError(stream, e);\n}\n\nexport function ReadableByteStreamControllerGetBYOBRequest(\n  controller: ReadableByteStreamController\n): ReadableStreamBYOBRequest | null {\n  if (controller._byobRequest === null && controller._pendingPullIntos.length > 0) {\n    const firstDescriptor = controller._pendingPullIntos.peek();\n    const view = new Uint8Array(firstDescriptor.buffer,\n                                firstDescriptor.byteOffset + firstDescriptor.bytesFilled,\n                                firstDescriptor.byteLength - firstDescriptor.bytesFilled);\n\n    const byobRequest: ReadableStreamBYOBRequest = Object.create(ReadableStreamBYOBRequest.prototype);\n    SetUpReadableStreamBYOBRequest(byobRequest, controller, view);\n    controller._byobRequest = byobRequest;\n  }\n  return controller._byobRequest;\n}\n\nfunction ReadableByteStreamControllerGetDesiredSize(controller: ReadableByteStreamController): number | null {\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'errored') {\n    return null;\n  }\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\nexport function ReadableByteStreamControllerRespond(controller: ReadableByteStreamController, bytesWritten: number) {\n  assert(controller._pendingPullIntos.length > 0);\n\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'closed') {\n    if (bytesWritten !== 0) {\n      throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream');\n    }\n  } else {\n    assert(state === 'readable');\n    if (bytesWritten === 0) {\n      throw new TypeError('bytesWritten must be greater than 0 when calling respond() on a readable stream');\n    }\n    if (firstDescriptor.bytesFilled + bytesWritten > firstDescriptor.byteLength) {\n      throw new RangeError('bytesWritten out of range');\n    }\n  }\n\n  firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer);\n\n  ReadableByteStreamControllerRespondInternal(controller, bytesWritten);\n}\n\nexport function ReadableByteStreamControllerRespondWithNewView(controller: ReadableByteStreamController,\n                                                               view: ArrayBufferView) {\n  assert(controller._pendingPullIntos.length > 0);\n  assert(!IsDetachedBuffer(view.buffer));\n\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'closed') {\n    if (view.byteLength !== 0) {\n      throw new TypeError('The view\\'s length must be 0 when calling respondWithNewView() on a closed stream');\n    }\n  } else {\n    assert(state === 'readable');\n    if (view.byteLength === 0) {\n      throw new TypeError(\n        'The view\\'s length must be greater than 0 when calling respondWithNewView() on a readable stream'\n      );\n    }\n  }\n\n  if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) {\n    throw new RangeError('The region specified by view does not match byobRequest');\n  }\n  if (firstDescriptor.bufferByteLength !== view.buffer.byteLength) {\n    throw new RangeError('The buffer of view has different capacity than byobRequest');\n  }\n  if (firstDescriptor.bytesFilled + view.byteLength > firstDescriptor.byteLength) {\n    throw new RangeError('The region specified by view is larger than byobRequest');\n  }\n\n  const viewByteLength = view.byteLength;\n  firstDescriptor.buffer = TransferArrayBuffer(view.buffer);\n  ReadableByteStreamControllerRespondInternal(controller, viewByteLength);\n}\n\nexport function SetUpReadableByteStreamController(stream: ReadableByteStream,\n                                                  controller: ReadableByteStreamController,\n                                                  startAlgorithm: () => void | PromiseLike<void>,\n                                                  pullAlgorithm: () => Promise<void>,\n                                                  cancelAlgorithm: (reason: any) => Promise<void>,\n                                                  highWaterMark: number,\n                                                  autoAllocateChunkSize: number | undefined) {\n  assert(stream._readableStreamController === undefined);\n  if (autoAllocateChunkSize !== undefined) {\n    assert(NumberIsInteger(autoAllocateChunkSize));\n    assert(autoAllocateChunkSize > 0);\n  }\n\n  controller._controlledReadableByteStream = stream;\n\n  controller._pullAgain = false;\n  controller._pulling = false;\n\n  controller._byobRequest = null;\n\n  // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n  controller._queue = controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._closeRequested = false;\n  controller._started = false;\n\n  controller._strategyHWM = highWaterMark;\n\n  controller._pullAlgorithm = pullAlgorithm;\n  controller._cancelAlgorithm = cancelAlgorithm;\n\n  controller._autoAllocateChunkSize = autoAllocateChunkSize;\n\n  controller._pendingPullIntos = new SimpleQueue();\n\n  stream._readableStreamController = controller;\n\n  const startResult = startAlgorithm();\n  uponPromise(\n    promiseResolvedWith(startResult),\n    () => {\n      controller._started = true;\n\n      assert(!controller._pulling);\n      assert(!controller._pullAgain);\n\n      ReadableByteStreamControllerCallPullIfNeeded(controller);\n    },\n    r => {\n      ReadableByteStreamControllerError(controller, r);\n    }\n  );\n}\n\nexport function SetUpReadableByteStreamControllerFromUnderlyingSource(\n  stream: ReadableByteStream,\n  underlyingByteSource: ValidatedUnderlyingByteSource,\n  highWaterMark: number\n) {\n  const controller: ReadableByteStreamController = Object.create(ReadableByteStreamController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let pullAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let cancelAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingByteSource.start !== undefined) {\n    startAlgorithm = () => underlyingByteSource.start!(controller);\n  }\n  if (underlyingByteSource.pull !== undefined) {\n    pullAlgorithm = () => underlyingByteSource.pull!(controller);\n  }\n  if (underlyingByteSource.cancel !== undefined) {\n    cancelAlgorithm = reason => underlyingByteSource.cancel!(reason);\n  }\n\n  const autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;\n  if (autoAllocateChunkSize === 0) {\n    throw new TypeError('autoAllocateChunkSize must be greater than 0');\n  }\n\n  SetUpReadableByteStreamController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize\n  );\n}\n\nfunction SetUpReadableStreamBYOBRequest(request: ReadableStreamBYOBRequest,\n                                        controller: ReadableByteStreamController,\n                                        view: ArrayBufferView) {\n  assert(IsReadableByteStreamController(controller));\n  assert(typeof view === 'object');\n  assert(ArrayBuffer.isView(view));\n  assert(!IsDetachedBuffer(view.buffer));\n  request._associatedReadableByteStreamController = controller;\n  request._view = view;\n}\n\n// Helper functions for the ReadableStreamBYOBRequest.\n\nfunction byobRequestBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamBYOBRequest.prototype.${name} can only be used on a ReadableStreamBYOBRequest`);\n}\n\n// Helper functions for the ReadableByteStreamController.\n\nfunction byteStreamControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableByteStreamController.prototype.${name} can only be used on a ReadableByteStreamController`);\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericInitialize,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport { IsReadableStreamLocked, ReadableByteStream, ReadableStream } from '../readable-stream';\nimport {\n  IsReadableByteStreamController,\n  ReadableByteStreamController,\n  ReadableByteStreamControllerPullInto\n} from './byte-stream-controller';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { newPromise, promiseRejectedWith } from '../helpers/webidl';\nimport { assertRequiredArgument } from '../validators/basic';\nimport { assertReadableStream } from '../validators/readable-stream';\nimport { IsDetachedBuffer } from '../abstract-ops/ecmascript';\n\n/**\n * A result returned by {@link ReadableStreamBYOBReader.read}.\n *\n * @public\n */\nexport type ReadableStreamBYOBReadResult<T extends ArrayBufferView> = {\n  done: false;\n  value: T;\n} | {\n  done: true;\n  value: T | undefined;\n};\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamBYOBReader(stream: ReadableByteStream): ReadableStreamBYOBReader {\n  return new ReadableStreamBYOBReader(stream);\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamAddReadIntoRequest<T extends ArrayBufferView>(stream: ReadableByteStream,\n                                                                            readIntoRequest: ReadIntoRequest<T>): void {\n  assert(IsReadableStreamBYOBReader(stream._reader));\n  assert(stream._state === 'readable' || stream._state === 'closed');\n\n  (stream._reader! as ReadableStreamBYOBReader)._readIntoRequests.push(readIntoRequest);\n}\n\nexport function ReadableStreamFulfillReadIntoRequest(stream: ReadableByteStream,\n                                                     chunk: ArrayBufferView,\n                                                     done: boolean) {\n  const reader = stream._reader as ReadableStreamBYOBReader;\n\n  assert(reader._readIntoRequests.length > 0);\n\n  const readIntoRequest = reader._readIntoRequests.shift()!;\n  if (done) {\n    readIntoRequest._closeSteps(chunk);\n  } else {\n    readIntoRequest._chunkSteps(chunk);\n  }\n}\n\nexport function ReadableStreamGetNumReadIntoRequests(stream: ReadableByteStream): number {\n  return (stream._reader as ReadableStreamBYOBReader)._readIntoRequests.length;\n}\n\nexport function ReadableStreamHasBYOBReader(stream: ReadableByteStream): boolean {\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return false;\n  }\n\n  if (!IsReadableStreamBYOBReader(reader)) {\n    return false;\n  }\n\n  return true;\n}\n\n// Readers\n\nexport interface ReadIntoRequest<T extends ArrayBufferView> {\n  _chunkSteps(chunk: T): void;\n\n  _closeSteps(chunk: T | undefined): void;\n\n  _errorSteps(e: any): void;\n}\n\n/**\n * A BYOB reader vended by a {@link ReadableStream}.\n *\n * @public\n */\nexport class ReadableStreamBYOBReader {\n  /** @internal */\n  _ownerReadableStream!: ReadableByteStream;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readIntoRequests: SimpleQueue<ReadIntoRequest<any>>;\n\n  constructor(stream: ReadableByteStream) {\n    assertRequiredArgument(stream, 1, 'ReadableStreamBYOBReader');\n    assertReadableStream(stream, 'First parameter');\n\n    if (IsReadableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n    }\n\n    if (!IsReadableByteStreamController(stream._readableStreamController)) {\n      throw new TypeError('Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte ' +\n        'source');\n    }\n\n    ReadableStreamReaderGenericInitialize(this, stream);\n\n    this._readIntoRequests = new SimpleQueue();\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or\n   * the reader's lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('cancel'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('cancel'));\n    }\n\n    return ReadableStreamReaderGenericCancel(this, reason);\n  }\n\n  /**\n   * Attempts to reads bytes into view, and returns a promise resolved with the result.\n   *\n   * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.\n   */\n  read<T extends ArrayBufferView>(view: T): Promise<ReadableStreamBYOBReadResult<T>> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('read'));\n    }\n\n    if (!ArrayBuffer.isView(view)) {\n      return promiseRejectedWith(new TypeError('view must be an array buffer view'));\n    }\n    if (view.byteLength === 0) {\n      return promiseRejectedWith(new TypeError('view must have non-zero byteLength'));\n    }\n    if (view.buffer.byteLength === 0) {\n      return promiseRejectedWith(new TypeError(`view's buffer must have non-zero byteLength`));\n    }\n    if (IsDetachedBuffer(view.buffer)) {\n      return promiseRejectedWith(new TypeError('view\\'s buffer has been detached'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('read from'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamBYOBReadResult<T>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamBYOBReadResult<T>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readIntoRequest: ReadIntoRequest<T> = {\n      _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),\n      _closeSteps: chunk => resolvePromise({ value: chunk, done: true }),\n      _errorSteps: e => rejectPromise(e)\n    };\n    ReadableStreamBYOBReaderRead(this, view, readIntoRequest);\n    return promise;\n  }\n\n  /**\n   * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.\n   * If the associated stream is errored when the lock is released, the reader will appear errored in the same way\n   * from now on; otherwise, the reader will appear closed.\n   *\n   * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by\n   * the reader's {@link ReadableStreamBYOBReader.read | read()} method has not yet been settled. Attempting to\n   * do so will throw a `TypeError` and leave the reader locked to the stream.\n   */\n  releaseLock(): void {\n    if (!IsReadableStreamBYOBReader(this)) {\n      throw byobReaderBrandCheckException('releaseLock');\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return;\n    }\n\n    if (this._readIntoRequests.length > 0) {\n      throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n    }\n\n    ReadableStreamReaderGenericRelease(this);\n  }\n}\n\nObject.defineProperties(ReadableStreamBYOBReader.prototype, {\n  cancel: { enumerable: true },\n  read: { enumerable: true },\n  releaseLock: { enumerable: true },\n  closed: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamBYOBReader.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamBYOBReader',\n    configurable: true\n  });\n}\n\n// Abstract operations for the readers.\n\nexport function IsReadableStreamBYOBReader(x: any): x is ReadableStreamBYOBReader {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readIntoRequests')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamBYOBReader;\n}\n\nexport function ReadableStreamBYOBReaderRead<T extends ArrayBufferView>(\n  reader: ReadableStreamBYOBReader,\n  view: T,\n  readIntoRequest: ReadIntoRequest<T>\n): void {\n  const stream = reader._ownerReadableStream;\n\n  assert(stream !== undefined);\n\n  stream._disturbed = true;\n\n  if (stream._state === 'errored') {\n    readIntoRequest._errorSteps(stream._storedError);\n  } else {\n    ReadableByteStreamControllerPullInto(\n      stream._readableStreamController as ReadableByteStreamController,\n      view,\n      readIntoRequest\n    );\n  }\n}\n\n// Helper functions for the ReadableStreamBYOBReader.\n\nfunction byobReaderBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamBYOBReader.prototype.${name} can only be used on a ReadableStreamBYOBReader`);\n}\n","import { QueuingStrategy, QueuingStrategySizeCallback } from '../queuing-strategy';\nimport NumberIsNaN from '../../stub/number-isnan';\n\nexport function ExtractHighWaterMark(strategy: QueuingStrategy, defaultHWM: number): number {\n  const { highWaterMark } = strategy;\n\n  if (highWaterMark === undefined) {\n    return defaultHWM;\n  }\n\n  if (NumberIsNaN(highWaterMark) || highWaterMark < 0) {\n    throw new RangeError('Invalid highWaterMark');\n  }\n\n  return highWaterMark;\n}\n\nexport function ExtractSizeAlgorithm<T>(strategy: QueuingStrategy<T>): QueuingStrategySizeCallback<T> {\n  const { size } = strategy;\n\n  if (!size) {\n    return () => 1;\n  }\n\n  return size;\n}\n","import { QueuingStrategy, QueuingStrategySizeCallback } from '../queuing-strategy';\nimport { assertDictionary, assertFunction, convertUnrestrictedDouble } from './basic';\n\nexport function convertQueuingStrategy<T>(init: QueuingStrategy<T> | null | undefined,\n                                          context: string): QueuingStrategy<T> {\n  assertDictionary(init, context);\n  const highWaterMark = init?.highWaterMark;\n  const size = init?.size;\n  return {\n    highWaterMark: highWaterMark === undefined ? undefined : convertUnrestrictedDouble(highWaterMark),\n    size: size === undefined ? undefined : convertQueuingStrategySize(size, `${context} has member 'size' that`)\n  };\n}\n\nfunction convertQueuingStrategySize<T>(fn: QueuingStrategySizeCallback<T>,\n                                       context: string): QueuingStrategySizeCallback<T> {\n  assertFunction(fn, context);\n  return chunk => convertUnrestrictedDouble(fn(chunk));\n}\n","import { assertDictionary, assertFunction } from './basic';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\nimport {\n  UnderlyingSink,\n  UnderlyingSinkAbortCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  ValidatedUnderlyingSink\n} from '../writable-stream/underlying-sink';\nimport { WritableStreamDefaultController } from '../writable-stream';\n\nexport function convertUnderlyingSink<W>(original: UnderlyingSink<W> | null,\n                                         context: string): ValidatedUnderlyingSink<W> {\n  assertDictionary(original, context);\n  const abort = original?.abort;\n  const close = original?.close;\n  const start = original?.start;\n  const type = original?.type;\n  const write = original?.write;\n  return {\n    abort: abort === undefined ?\n      undefined :\n      convertUnderlyingSinkAbortCallback(abort, original!, `${context} has member 'abort' that`),\n    close: close === undefined ?\n      undefined :\n      convertUnderlyingSinkCloseCallback(close, original!, `${context} has member 'close' that`),\n    start: start === undefined ?\n      undefined :\n      convertUnderlyingSinkStartCallback(start, original!, `${context} has member 'start' that`),\n    write: write === undefined ?\n      undefined :\n      convertUnderlyingSinkWriteCallback(write, original!, `${context} has member 'write' that`),\n    type\n  };\n}\n\nfunction convertUnderlyingSinkAbortCallback(\n  fn: UnderlyingSinkAbortCallback,\n  original: UnderlyingSink,\n  context: string\n): (reason: any) => Promise<void> {\n  assertFunction(fn, context);\n  return (reason: any) => promiseCall(fn, original, [reason]);\n}\n\nfunction convertUnderlyingSinkCloseCallback(\n  fn: UnderlyingSinkCloseCallback,\n  original: UnderlyingSink,\n  context: string\n): () => Promise<void> {\n  assertFunction(fn, context);\n  return () => promiseCall(fn, original, []);\n}\n\nfunction convertUnderlyingSinkStartCallback(\n  fn: UnderlyingSinkStartCallback,\n  original: UnderlyingSink,\n  context: string\n): UnderlyingSinkStartCallback {\n  assertFunction(fn, context);\n  return (controller: WritableStreamDefaultController) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertUnderlyingSinkWriteCallback<W>(\n  fn: UnderlyingSinkWriteCallback<W>,\n  original: UnderlyingSink<W>,\n  context: string\n): (chunk: W, controller: WritableStreamDefaultController) => Promise<void> {\n  assertFunction(fn, context);\n  return (chunk: W, controller: WritableStreamDefaultController) => promiseCall(fn, original, [chunk, controller]);\n}\n","import { IsWritableStream, WritableStream } from '../writable-stream';\n\nexport function assertWritableStream(x: unknown, context: string): asserts x is WritableStream {\n  if (!IsWritableStream(x)) {\n    throw new TypeError(`${context} is not a WritableStream.`);\n  }\n}\n","/**\n * A signal object that allows you to communicate with a request and abort it if required\n * via its associated `AbortController` object.\n *\n * @remarks\n *   This interface is compatible with the `AbortSignal` interface defined in TypeScript's DOM types.\n *   It is redefined here, so it can be polyfilled without a DOM, for example with\n *   {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.\n *\n * @public\n */\nexport interface AbortSignal {\n  /**\n   * Whether the request is aborted.\n   */\n  readonly aborted: boolean;\n\n  /**\n   * Add an event listener to be triggered when this signal becomes aborted.\n   */\n  addEventListener(type: 'abort', listener: () => void): void;\n\n  /**\n   * Remove an event listener that was previously added with {@link AbortSignal.addEventListener}.\n   */\n  removeEventListener(type: 'abort', listener: () => void): void;\n}\n\nexport function isAbortSignal(value: unknown): value is AbortSignal {\n  if (typeof value !== 'object' || value === null) {\n    return false;\n  }\n  try {\n    return typeof (value as AbortSignal).aborted === 'boolean';\n  } catch {\n    // AbortSignal.prototype.aborted throws if its brand check fails\n    return false;\n  }\n}\n\n/**\n * A controller object that allows you to abort an `AbortSignal` when desired.\n *\n * @remarks\n *   This interface is compatible with the `AbortController` interface defined in TypeScript's DOM types.\n *   It is redefined here, so it can be polyfilled without a DOM, for example with\n *   {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.\n *\n * @internal\n */\nexport interface AbortController {\n  readonly signal: AbortSignal;\n\n  abort(): void;\n}\n\ninterface AbortControllerConstructor {\n  new(): AbortController;\n}\n\nconst supportsAbortController = typeof (AbortController as any) === 'function';\n\n/**\n * Construct a new AbortController, if supported by the platform.\n *\n * @internal\n */\nexport function createAbortController(): AbortController | undefined {\n  if (supportsAbortController) {\n    return new (AbortController as AbortControllerConstructor)();\n  }\n  return undefined;\n}\n","import assert from '../stub/assert';\nimport {\n  newPromise,\n  promiseRejectedWith,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  uponPromise\n} from './helpers/webidl';\nimport {\n  DequeueValue,\n  EnqueueValueWithSize,\n  PeekQueueValue,\n  QueuePair,\n  ResetQueue\n} from './abstract-ops/queue-with-sizes';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { SimpleQueue } from './simple-queue';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { AbortSteps, ErrorSteps } from './abstract-ops/internal-methods';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport {\n  UnderlyingSink,\n  UnderlyingSinkAbortCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  ValidatedUnderlyingSink\n} from './writable-stream/underlying-sink';\nimport { assertObject, assertRequiredArgument } from './validators/basic';\nimport { convertUnderlyingSink } from './validators/underlying-sink';\nimport { assertWritableStream } from './validators/writable-stream';\nimport { AbortController, AbortSignal, createAbortController } from './abort-signal';\n\ntype WritableStreamState = 'writable' | 'closed' | 'erroring' | 'errored';\n\ninterface WriteOrCloseRequest {\n  _resolve: (value?: undefined) => void;\n  _reject: (reason: any) => void;\n}\n\ntype WriteRequest = WriteOrCloseRequest;\ntype CloseRequest = WriteOrCloseRequest;\n\ninterface PendingAbortRequest {\n  _promise: Promise<undefined>;\n  _resolve: (value?: undefined) => void;\n  _reject: (reason: any) => void;\n  _reason: any;\n  _wasAlreadyErroring: boolean;\n}\n\n/**\n * A writable stream represents a destination for data, into which you can write.\n *\n * @public\n */\nclass WritableStream<W = any> {\n  /** @internal */\n  _state!: WritableStreamState;\n  /** @internal */\n  _storedError: any;\n  /** @internal */\n  _writer: WritableStreamDefaultWriter<W> | undefined;\n  /** @internal */\n  _writableStreamController!: WritableStreamDefaultController<W>;\n  /** @internal */\n  _writeRequests!: SimpleQueue<WriteRequest>;\n  /** @internal */\n  _inFlightWriteRequest: WriteRequest | undefined;\n  /** @internal */\n  _closeRequest: CloseRequest | undefined;\n  /** @internal */\n  _inFlightCloseRequest: CloseRequest | undefined;\n  /** @internal */\n  _pendingAbortRequest: PendingAbortRequest | undefined;\n  /** @internal */\n  _backpressure!: boolean;\n\n  constructor(underlyingSink?: UnderlyingSink<W>, strategy?: QueuingStrategy<W>);\n  constructor(rawUnderlyingSink: UnderlyingSink<W> | null | undefined = {},\n              rawStrategy: QueuingStrategy<W> | null | undefined = {}) {\n    if (rawUnderlyingSink === undefined) {\n      rawUnderlyingSink = null;\n    } else {\n      assertObject(rawUnderlyingSink, 'First parameter');\n    }\n\n    const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');\n    const underlyingSink = convertUnderlyingSink(rawUnderlyingSink, 'First parameter');\n\n    InitializeWritableStream(this);\n\n    const type = underlyingSink.type;\n    if (type !== undefined) {\n      throw new RangeError('Invalid type is specified');\n    }\n\n    const sizeAlgorithm = ExtractSizeAlgorithm(strategy);\n    const highWaterMark = ExtractHighWaterMark(strategy, 1);\n\n    SetUpWritableStreamDefaultControllerFromUnderlyingSink(this, underlyingSink, highWaterMark, sizeAlgorithm);\n  }\n\n  /**\n   * Returns whether or not the writable stream is locked to a writer.\n   */\n  get locked(): boolean {\n    if (!IsWritableStream(this)) {\n      throw streamBrandCheckException('locked');\n    }\n\n    return IsWritableStreamLocked(this);\n  }\n\n  /**\n   * Aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be\n   * immediately moved to an errored state, with any queued-up writes discarded. This will also execute any abort\n   * mechanism of the underlying sink.\n   *\n   * The returned promise will fulfill if the stream shuts down successfully, or reject if the underlying sink signaled\n   * that there was an error doing so. Additionally, it will reject with a `TypeError` (without attempting to cancel\n   * the stream) if the stream is currently locked.\n   */\n  abort(reason: any = undefined): Promise<void> {\n    if (!IsWritableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('abort'));\n    }\n\n    if (IsWritableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot abort a stream that already has a writer'));\n    }\n\n    return WritableStreamAbort(this, reason);\n  }\n\n  /**\n   * Closes the stream. The underlying sink will finish processing any previously-written chunks, before invoking its\n   * close behavior. During this time any further attempts to write will fail (without erroring the stream).\n   *\n   * The method returns a promise that will fulfill if all remaining chunks are successfully written and the stream\n   * successfully closes, or rejects if an error is encountered during this process. Additionally, it will reject with\n   * a `TypeError` (without attempting to cancel the stream) if the stream is currently locked.\n   */\n  close() {\n    if (!IsWritableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('close'));\n    }\n\n    if (IsWritableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot close a stream that already has a writer'));\n    }\n\n    if (WritableStreamCloseQueuedOrInFlight(this)) {\n      return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));\n    }\n\n    return WritableStreamClose(this);\n  }\n\n  /**\n   * Creates a {@link WritableStreamDefaultWriter | writer} and locks the stream to the new writer. While the stream\n   * is locked, no other writer can be acquired until this one is released.\n   *\n   * This functionality is especially useful for creating abstractions that desire the ability to write to a stream\n   * without interruption or interleaving. By getting a writer for the stream, you can ensure nobody else can write at\n   * the same time, which would cause the resulting written data to be unpredictable and probably useless.\n   */\n  getWriter(): WritableStreamDefaultWriter<W> {\n    if (!IsWritableStream(this)) {\n      throw streamBrandCheckException('getWriter');\n    }\n\n    return AcquireWritableStreamDefaultWriter(this);\n  }\n}\n\nObject.defineProperties(WritableStream.prototype, {\n  abort: { enumerable: true },\n  close: { enumerable: true },\n  getWriter: { enumerable: true },\n  locked: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStream.prototype, Symbol.toStringTag, {\n    value: 'WritableStream',\n    configurable: true\n  });\n}\n\nexport {\n  AcquireWritableStreamDefaultWriter,\n  CreateWritableStream,\n  IsWritableStream,\n  IsWritableStreamLocked,\n  WritableStream,\n  WritableStreamAbort,\n  WritableStreamDefaultControllerErrorIfNeeded,\n  WritableStreamDefaultWriterCloseWithErrorPropagation,\n  WritableStreamDefaultWriterRelease,\n  WritableStreamDefaultWriterWrite,\n  WritableStreamCloseQueuedOrInFlight,\n  UnderlyingSink,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkAbortCallback\n};\n\n// Abstract operations for the WritableStream.\n\nfunction AcquireWritableStreamDefaultWriter<W>(stream: WritableStream<W>): WritableStreamDefaultWriter<W> {\n  return new WritableStreamDefaultWriter(stream);\n}\n\n// Throws if and only if startAlgorithm throws.\nfunction CreateWritableStream<W>(startAlgorithm: () => void | PromiseLike<void>,\n                                 writeAlgorithm: (chunk: W) => Promise<void>,\n                                 closeAlgorithm: () => Promise<void>,\n                                 abortAlgorithm: (reason: any) => Promise<void>,\n                                 highWaterMark = 1,\n                                 sizeAlgorithm: QueuingStrategySizeCallback<W> = () => 1) {\n  assert(IsNonNegativeNumber(highWaterMark));\n\n  const stream: WritableStream<W> = Object.create(WritableStream.prototype);\n  InitializeWritableStream(stream);\n\n  const controller: WritableStreamDefaultController<W> = Object.create(WritableStreamDefaultController.prototype);\n\n  SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm,\n                                       abortAlgorithm, highWaterMark, sizeAlgorithm);\n  return stream;\n}\n\nfunction InitializeWritableStream<W>(stream: WritableStream<W>) {\n  stream._state = 'writable';\n\n  // The error that will be reported by new method calls once the state becomes errored. Only set when [[state]] is\n  // 'erroring' or 'errored'. May be set to an undefined value.\n  stream._storedError = undefined;\n\n  stream._writer = undefined;\n\n  // Initialize to undefined first because the constructor of the controller checks this\n  // variable to validate the caller.\n  stream._writableStreamController = undefined!;\n\n  // This queue is placed here instead of the writer class in order to allow for passing a writer to the next data\n  // producer without waiting for the queued writes to finish.\n  stream._writeRequests = new SimpleQueue();\n\n  // Write requests are removed from _writeRequests when write() is called on the underlying sink. This prevents\n  // them from being erroneously rejected on error. If a write() call is in-flight, the request is stored here.\n  stream._inFlightWriteRequest = undefined;\n\n  // The promise that was returned from writer.close(). Stored here because it may be fulfilled after the writer\n  // has been detached.\n  stream._closeRequest = undefined;\n\n  // Close request is removed from _closeRequest when close() is called on the underlying sink. This prevents it\n  // from being erroneously rejected on error. If a close() call is in-flight, the request is stored here.\n  stream._inFlightCloseRequest = undefined;\n\n  // The promise that was returned from writer.abort(). This may also be fulfilled after the writer has detached.\n  stream._pendingAbortRequest = undefined;\n\n  // The backpressure signal set by the controller.\n  stream._backpressure = false;\n}\n\nfunction IsWritableStream(x: unknown): x is WritableStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_writableStreamController')) {\n    return false;\n  }\n\n  return x instanceof WritableStream;\n}\n\nfunction IsWritableStreamLocked(stream: WritableStream): boolean {\n  assert(IsWritableStream(stream));\n\n  if (stream._writer === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamAbort(stream: WritableStream, reason: any): Promise<undefined> {\n  if (stream._state === 'closed' || stream._state === 'errored') {\n    return promiseResolvedWith(undefined);\n  }\n  stream._writableStreamController._abortReason = reason;\n  stream._writableStreamController._abortController?.abort();\n\n  // TypeScript narrows the type of `stream._state` down to 'writable' | 'erroring',\n  // but it doesn't know that signaling abort runs author code that might have changed the state.\n  // Widen the type again by casting to WritableStreamState.\n  const state = stream._state as WritableStreamState;\n\n  if (state === 'closed' || state === 'errored') {\n    return promiseResolvedWith(undefined);\n  }\n  if (stream._pendingAbortRequest !== undefined) {\n    return stream._pendingAbortRequest._promise;\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n\n  let wasAlreadyErroring = false;\n  if (state === 'erroring') {\n    wasAlreadyErroring = true;\n    // reason will not be used, so don't keep a reference to it.\n    reason = undefined;\n  }\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    stream._pendingAbortRequest = {\n      _promise: undefined!,\n      _resolve: resolve,\n      _reject: reject,\n      _reason: reason,\n      _wasAlreadyErroring: wasAlreadyErroring\n    };\n  });\n  stream._pendingAbortRequest!._promise = promise;\n\n  if (!wasAlreadyErroring) {\n    WritableStreamStartErroring(stream, reason);\n  }\n\n  return promise;\n}\n\nfunction WritableStreamClose(stream: WritableStream<any>): Promise<undefined> {\n  const state = stream._state;\n  if (state === 'closed' || state === 'errored') {\n    return promiseRejectedWith(new TypeError(\n      `The stream (in ${state} state) is not in the writable state and cannot be closed`));\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n  assert(!WritableStreamCloseQueuedOrInFlight(stream));\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    const closeRequest: CloseRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._closeRequest = closeRequest;\n  });\n\n  const writer = stream._writer;\n  if (writer !== undefined && stream._backpressure && state === 'writable') {\n    defaultWriterReadyPromiseResolve(writer);\n  }\n\n  WritableStreamDefaultControllerClose(stream._writableStreamController);\n\n  return promise;\n}\n\n// WritableStream API exposed for controllers.\n\nfunction WritableStreamAddWriteRequest(stream: WritableStream): Promise<undefined> {\n  assert(IsWritableStreamLocked(stream));\n  assert(stream._state === 'writable');\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    const writeRequest: WriteRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._writeRequests.push(writeRequest);\n  });\n\n  return promise;\n}\n\nfunction WritableStreamDealWithRejection(stream: WritableStream, error: any) {\n  const state = stream._state;\n\n  if (state === 'writable') {\n    WritableStreamStartErroring(stream, error);\n    return;\n  }\n\n  assert(state === 'erroring');\n  WritableStreamFinishErroring(stream);\n}\n\nfunction WritableStreamStartErroring(stream: WritableStream, reason: any) {\n  assert(stream._storedError === undefined);\n  assert(stream._state === 'writable');\n\n  const controller = stream._writableStreamController;\n  assert(controller !== undefined);\n\n  stream._state = 'erroring';\n  stream._storedError = reason;\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);\n  }\n\n  if (!WritableStreamHasOperationMarkedInFlight(stream) && controller._started) {\n    WritableStreamFinishErroring(stream);\n  }\n}\n\nfunction WritableStreamFinishErroring(stream: WritableStream) {\n  assert(stream._state === 'erroring');\n  assert(!WritableStreamHasOperationMarkedInFlight(stream));\n  stream._state = 'errored';\n  stream._writableStreamController[ErrorSteps]();\n\n  const storedError = stream._storedError;\n  stream._writeRequests.forEach(writeRequest => {\n    writeRequest._reject(storedError);\n  });\n  stream._writeRequests = new SimpleQueue();\n\n  if (stream._pendingAbortRequest === undefined) {\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    return;\n  }\n\n  const abortRequest = stream._pendingAbortRequest;\n  stream._pendingAbortRequest = undefined;\n\n  if (abortRequest._wasAlreadyErroring) {\n    abortRequest._reject(storedError);\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    return;\n  }\n\n  const promise = stream._writableStreamController[AbortSteps](abortRequest._reason);\n  uponPromise(\n    promise,\n    () => {\n      abortRequest._resolve();\n      WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    },\n    (reason: any) => {\n      abortRequest._reject(reason);\n      WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    });\n}\n\nfunction WritableStreamFinishInFlightWrite(stream: WritableStream) {\n  assert(stream._inFlightWriteRequest !== undefined);\n  stream._inFlightWriteRequest!._resolve(undefined);\n  stream._inFlightWriteRequest = undefined;\n}\n\nfunction WritableStreamFinishInFlightWriteWithError(stream: WritableStream, error: any) {\n  assert(stream._inFlightWriteRequest !== undefined);\n  stream._inFlightWriteRequest!._reject(error);\n  stream._inFlightWriteRequest = undefined;\n\n  assert(stream._state === 'writable' || stream._state === 'erroring');\n\n  WritableStreamDealWithRejection(stream, error);\n}\n\nfunction WritableStreamFinishInFlightClose(stream: WritableStream) {\n  assert(stream._inFlightCloseRequest !== undefined);\n  stream._inFlightCloseRequest!._resolve(undefined);\n  stream._inFlightCloseRequest = undefined;\n\n  const state = stream._state;\n\n  assert(state === 'writable' || state === 'erroring');\n\n  if (state === 'erroring') {\n    // The error was too late to do anything, so it is ignored.\n    stream._storedError = undefined;\n    if (stream._pendingAbortRequest !== undefined) {\n      stream._pendingAbortRequest._resolve();\n      stream._pendingAbortRequest = undefined;\n    }\n  }\n\n  stream._state = 'closed';\n\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    defaultWriterClosedPromiseResolve(writer);\n  }\n\n  assert(stream._pendingAbortRequest === undefined);\n  assert(stream._storedError === undefined);\n}\n\nfunction WritableStreamFinishInFlightCloseWithError(stream: WritableStream, error: any) {\n  assert(stream._inFlightCloseRequest !== undefined);\n  stream._inFlightCloseRequest!._reject(error);\n  stream._inFlightCloseRequest = undefined;\n\n  assert(stream._state === 'writable' || stream._state === 'erroring');\n\n  // Never execute sink abort() after sink close().\n  if (stream._pendingAbortRequest !== undefined) {\n    stream._pendingAbortRequest._reject(error);\n    stream._pendingAbortRequest = undefined;\n  }\n  WritableStreamDealWithRejection(stream, error);\n}\n\n// TODO(ricea): Fix alphabetical order.\nfunction WritableStreamCloseQueuedOrInFlight(stream: WritableStream): boolean {\n  if (stream._closeRequest === undefined && stream._inFlightCloseRequest === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamHasOperationMarkedInFlight(stream: WritableStream): boolean {\n  if (stream._inFlightWriteRequest === undefined && stream._inFlightCloseRequest === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamMarkCloseRequestInFlight(stream: WritableStream) {\n  assert(stream._inFlightCloseRequest === undefined);\n  assert(stream._closeRequest !== undefined);\n  stream._inFlightCloseRequest = stream._closeRequest;\n  stream._closeRequest = undefined;\n}\n\nfunction WritableStreamMarkFirstWriteRequestInFlight(stream: WritableStream) {\n  assert(stream._inFlightWriteRequest === undefined);\n  assert(stream._writeRequests.length !== 0);\n  stream._inFlightWriteRequest = stream._writeRequests.shift();\n}\n\nfunction WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream: WritableStream) {\n  assert(stream._state === 'errored');\n  if (stream._closeRequest !== undefined) {\n    assert(stream._inFlightCloseRequest === undefined);\n\n    stream._closeRequest._reject(stream._storedError);\n    stream._closeRequest = undefined;\n  }\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    defaultWriterClosedPromiseReject(writer, stream._storedError);\n  }\n}\n\nfunction WritableStreamUpdateBackpressure(stream: WritableStream, backpressure: boolean) {\n  assert(stream._state === 'writable');\n  assert(!WritableStreamCloseQueuedOrInFlight(stream));\n\n  const writer = stream._writer;\n  if (writer !== undefined && backpressure !== stream._backpressure) {\n    if (backpressure) {\n      defaultWriterReadyPromiseReset(writer);\n    } else {\n      assert(!backpressure);\n\n      defaultWriterReadyPromiseResolve(writer);\n    }\n  }\n\n  stream._backpressure = backpressure;\n}\n\n/**\n * A default writer vended by a {@link WritableStream}.\n *\n * @public\n */\nexport class WritableStreamDefaultWriter<W = any> {\n  /** @internal */\n  _ownerWritableStream: WritableStream<W>;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _closedPromiseState!: 'pending' | 'resolved' | 'rejected';\n  /** @internal */\n  _readyPromise!: Promise<undefined>;\n  /** @internal */\n  _readyPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _readyPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readyPromiseState!: 'pending' | 'fulfilled' | 'rejected';\n\n  constructor(stream: WritableStream<W>) {\n    assertRequiredArgument(stream, 1, 'WritableStreamDefaultWriter');\n    assertWritableStream(stream, 'First parameter');\n\n    if (IsWritableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive writing by another writer');\n    }\n\n    this._ownerWritableStream = stream;\n    stream._writer = this;\n\n    const state = stream._state;\n\n    if (state === 'writable') {\n      if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._backpressure) {\n        defaultWriterReadyPromiseInitialize(this);\n      } else {\n        defaultWriterReadyPromiseInitializeAsResolved(this);\n      }\n\n      defaultWriterClosedPromiseInitialize(this);\n    } else if (state === 'erroring') {\n      defaultWriterReadyPromiseInitializeAsRejected(this, stream._storedError);\n      defaultWriterClosedPromiseInitialize(this);\n    } else if (state === 'closed') {\n      defaultWriterReadyPromiseInitializeAsResolved(this);\n      defaultWriterClosedPromiseInitializeAsResolved(this);\n    } else {\n      assert(state === 'errored');\n\n      const storedError = stream._storedError;\n      defaultWriterReadyPromiseInitializeAsRejected(this, storedError);\n      defaultWriterClosedPromiseInitializeAsRejected(this, storedError);\n    }\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or\n   * the writer’s lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * Returns the desired size to fill the stream’s internal queue. It can be negative, if the queue is over-full.\n   * A producer can use this information to determine the right amount of data to write.\n   *\n   * It will be `null` if the stream cannot be successfully written to (due to either being errored, or having an abort\n   * queued up). It will return zero if the stream is closed. And the getter will throw an exception if invoked when\n   * the writer’s lock is released.\n   */\n  get desiredSize(): number | null {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      throw defaultWriterBrandCheckException('desiredSize');\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      throw defaultWriterLockException('desiredSize');\n    }\n\n    return WritableStreamDefaultWriterGetDesiredSize(this);\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the desired size to fill the stream’s internal queue transitions\n   * from non-positive to positive, signaling that it is no longer applying backpressure. Once the desired size dips\n   * back to zero or below, the getter will return a new promise that stays pending until the next transition.\n   *\n   * If the stream becomes errored or aborted, or the writer’s lock is released, the returned promise will become\n   * rejected.\n   */\n  get ready(): Promise<undefined> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('ready'));\n    }\n\n    return this._readyPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link WritableStream.abort | stream.abort(reason)}.\n   */\n  abort(reason: any = undefined): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('abort'));\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('abort'));\n    }\n\n    return WritableStreamDefaultWriterAbort(this, reason);\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link WritableStream.close | stream.close()}.\n   */\n  close(): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('close'));\n    }\n\n    const stream = this._ownerWritableStream;\n\n    if (stream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('close'));\n    }\n\n    if (WritableStreamCloseQueuedOrInFlight(stream)) {\n      return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));\n    }\n\n    return WritableStreamDefaultWriterClose(this);\n  }\n\n  /**\n   * Releases the writer’s lock on the corresponding stream. After the lock is released, the writer is no longer active.\n   * If the associated stream is errored when the lock is released, the writer will appear errored in the same way from\n   * now on; otherwise, the writer will appear closed.\n   *\n   * Note that the lock can still be released even if some ongoing writes have not yet finished (i.e. even if the\n   * promises returned from previous calls to {@link WritableStreamDefaultWriter.write | write()} have not yet settled).\n   * It’s not necessary to hold the lock on the writer for the duration of the write; the lock instead simply prevents\n   * other producers from writing in an interleaved manner.\n   */\n  releaseLock(): void {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      throw defaultWriterBrandCheckException('releaseLock');\n    }\n\n    const stream = this._ownerWritableStream;\n\n    if (stream === undefined) {\n      return;\n    }\n\n    assert(stream._writer !== undefined);\n\n    WritableStreamDefaultWriterRelease(this);\n  }\n\n  /**\n   * Writes the given chunk to the writable stream, by waiting until any previous writes have finished successfully,\n   * and then sending the chunk to the underlying sink's {@link UnderlyingSink.write | write()} method. It will return\n   * a promise that fulfills with undefined upon a successful write, or rejects if the write fails or stream becomes\n   * errored before the writing process is initiated.\n   *\n   * Note that what \"success\" means is up to the underlying sink; it might indicate simply that the chunk has been\n   * accepted, and not necessarily that it is safely saved to its ultimate destination.\n   */\n  write(chunk: W): Promise<void>;\n  write(chunk: W = undefined!): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('write'));\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('write to'));\n    }\n\n    return WritableStreamDefaultWriterWrite(this, chunk);\n  }\n}\n\nObject.defineProperties(WritableStreamDefaultWriter.prototype, {\n  abort: { enumerable: true },\n  close: { enumerable: true },\n  releaseLock: { enumerable: true },\n  write: { enumerable: true },\n  closed: { enumerable: true },\n  desiredSize: { enumerable: true },\n  ready: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStreamDefaultWriter.prototype, Symbol.toStringTag, {\n    value: 'WritableStreamDefaultWriter',\n    configurable: true\n  });\n}\n\n// Abstract operations for the WritableStreamDefaultWriter.\n\nfunction IsWritableStreamDefaultWriter<W = any>(x: any): x is WritableStreamDefaultWriter<W> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) {\n    return false;\n  }\n\n  return x instanceof WritableStreamDefaultWriter;\n}\n\n// A client of WritableStreamDefaultWriter may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultWriterAbort(writer: WritableStreamDefaultWriter, reason: any) {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  return WritableStreamAbort(stream, reason);\n}\n\nfunction WritableStreamDefaultWriterClose(writer: WritableStreamDefaultWriter): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  return WritableStreamClose(stream);\n}\n\nfunction WritableStreamDefaultWriterCloseWithErrorPropagation(writer: WritableStreamDefaultWriter): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  const state = stream._state;\n  if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {\n    return promiseResolvedWith(undefined);\n  }\n\n  if (state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n\n  return WritableStreamDefaultWriterClose(writer);\n}\n\nfunction WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer: WritableStreamDefaultWriter, error: any) {\n  if (writer._closedPromiseState === 'pending') {\n    defaultWriterClosedPromiseReject(writer, error);\n  } else {\n    defaultWriterClosedPromiseResetToRejected(writer, error);\n  }\n}\n\nfunction WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer: WritableStreamDefaultWriter, error: any) {\n  if (writer._readyPromiseState === 'pending') {\n    defaultWriterReadyPromiseReject(writer, error);\n  } else {\n    defaultWriterReadyPromiseResetToRejected(writer, error);\n  }\n}\n\nfunction WritableStreamDefaultWriterGetDesiredSize(writer: WritableStreamDefaultWriter): number | null {\n  const stream = writer._ownerWritableStream;\n  const state = stream._state;\n\n  if (state === 'errored' || state === 'erroring') {\n    return null;\n  }\n\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return WritableStreamDefaultControllerGetDesiredSize(stream._writableStreamController);\n}\n\nfunction WritableStreamDefaultWriterRelease(writer: WritableStreamDefaultWriter) {\n  const stream = writer._ownerWritableStream;\n  assert(stream !== undefined);\n  assert(stream._writer === writer);\n\n  const releasedError = new TypeError(\n    `Writer was released and can no longer be used to monitor the stream's closedness`);\n\n  WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, releasedError);\n\n  // The state transitions to \"errored\" before the sink abort() method runs, but the writer.closed promise is not\n  // rejected until afterwards. This means that simply testing state will not work.\n  WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, releasedError);\n\n  stream._writer = undefined;\n  writer._ownerWritableStream = undefined!;\n}\n\nfunction WritableStreamDefaultWriterWrite<W>(writer: WritableStreamDefaultWriter<W>, chunk: W): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  const controller = stream._writableStreamController;\n\n  const chunkSize = WritableStreamDefaultControllerGetChunkSize(controller, chunk);\n\n  if (stream !== writer._ownerWritableStream) {\n    return promiseRejectedWith(defaultWriterLockException('write to'));\n  }\n\n  const state = stream._state;\n  if (state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n  if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {\n    return promiseRejectedWith(new TypeError('The stream is closing or closed and cannot be written to'));\n  }\n  if (state === 'erroring') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  assert(state === 'writable');\n\n  const promise = WritableStreamAddWriteRequest(stream);\n\n  WritableStreamDefaultControllerWrite(controller, chunk, chunkSize);\n\n  return promise;\n}\n\nconst closeSentinel: unique symbol = {} as any;\n\ntype QueueRecord<W> = W | typeof closeSentinel;\n\n/**\n * Allows control of a {@link WritableStream | writable stream}'s state and internal queue.\n *\n * @public\n */\nexport class WritableStreamDefaultController<W = any> {\n  /** @internal */\n  _controlledWritableStream!: WritableStream<W>;\n  /** @internal */\n  _queue!: SimpleQueue<QueuePair<QueueRecord<W>>>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _abortReason: any;\n  /** @internal */\n  _abortController: AbortController | undefined;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _strategySizeAlgorithm!: QueuingStrategySizeCallback<W>;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _writeAlgorithm!: (chunk: W) => Promise<void>;\n  /** @internal */\n  _closeAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _abortAlgorithm!: (reason: any) => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * The reason which was passed to `WritableStream.abort(reason)` when the stream was aborted.\n   *\n   * @deprecated\n   *  This property has been removed from the specification, see https://github.com/whatwg/streams/pull/1177.\n   *  Use {@link WritableStreamDefaultController.signal}'s `reason` instead.\n   */\n  get abortReason(): any {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('abortReason');\n    }\n    return this._abortReason;\n  }\n\n  /**\n   * An `AbortSignal` that can be used to abort the pending write or close operation when the stream is aborted.\n   */\n  get signal(): AbortSignal {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('signal');\n    }\n    if (this._abortController === undefined) {\n      // Older browsers or older Node versions may not support `AbortController` or `AbortSignal`.\n      // We don't want to bundle and ship an `AbortController` polyfill together with our polyfill,\n      // so instead we only implement support for `signal` if we find a global `AbortController` constructor.\n      throw new TypeError('WritableStreamDefaultController.prototype.signal is not supported');\n    }\n    return this._abortController.signal;\n  }\n\n  /**\n   * Closes the controlled writable stream, making all future interactions with it fail with the given error `e`.\n   *\n   * This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying\n   * sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the\n   * normal lifecycle of interactions with the underlying sink.\n   */\n  error(e: any = undefined): void {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n    const state = this._controlledWritableStream._state;\n    if (state !== 'writable') {\n      // The stream is closed, errored or will be soon. The sink can't do anything useful if it gets an error here, so\n      // just treat it as a no-op.\n      return;\n    }\n\n    WritableStreamDefaultControllerError(this, e);\n  }\n\n  /** @internal */\n  [AbortSteps](reason: any): Promise<void> {\n    const result = this._abortAlgorithm(reason);\n    WritableStreamDefaultControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [ErrorSteps]() {\n    ResetQueue(this);\n  }\n}\n\nObject.defineProperties(WritableStreamDefaultController.prototype, {\n  abortReason: { enumerable: true },\n  signal: { enumerable: true },\n  error: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'WritableStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Abstract operations implementing interface required by the WritableStream.\n\nfunction IsWritableStreamDefaultController(x: any): x is WritableStreamDefaultController<any> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledWritableStream')) {\n    return false;\n  }\n\n  return x instanceof WritableStreamDefaultController;\n}\n\nfunction SetUpWritableStreamDefaultController<W>(stream: WritableStream<W>,\n                                                 controller: WritableStreamDefaultController<W>,\n                                                 startAlgorithm: () => void | PromiseLike<void>,\n                                                 writeAlgorithm: (chunk: W) => Promise<void>,\n                                                 closeAlgorithm: () => Promise<void>,\n                                                 abortAlgorithm: (reason: any) => Promise<void>,\n                                                 highWaterMark: number,\n                                                 sizeAlgorithm: QueuingStrategySizeCallback<W>) {\n  assert(IsWritableStream(stream));\n  assert(stream._writableStreamController === undefined);\n\n  controller._controlledWritableStream = stream;\n  stream._writableStreamController = controller;\n\n  // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n  controller._queue = undefined!;\n  controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._abortReason = undefined;\n  controller._abortController = createAbortController();\n  controller._started = false;\n\n  controller._strategySizeAlgorithm = sizeAlgorithm;\n  controller._strategyHWM = highWaterMark;\n\n  controller._writeAlgorithm = writeAlgorithm;\n  controller._closeAlgorithm = closeAlgorithm;\n  controller._abortAlgorithm = abortAlgorithm;\n\n  const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n  WritableStreamUpdateBackpressure(stream, backpressure);\n\n  const startResult = startAlgorithm();\n  const startPromise = promiseResolvedWith(startResult);\n  uponPromise(\n    startPromise,\n    () => {\n      assert(stream._state === 'writable' || stream._state === 'erroring');\n      controller._started = true;\n      WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n    },\n    r => {\n      assert(stream._state === 'writable' || stream._state === 'erroring');\n      controller._started = true;\n      WritableStreamDealWithRejection(stream, r);\n    }\n  );\n}\n\nfunction SetUpWritableStreamDefaultControllerFromUnderlyingSink<W>(stream: WritableStream<W>,\n                                                                   underlyingSink: ValidatedUnderlyingSink<W>,\n                                                                   highWaterMark: number,\n                                                                   sizeAlgorithm: QueuingStrategySizeCallback<W>) {\n  const controller = Object.create(WritableStreamDefaultController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let writeAlgorithm: (chunk: W) => Promise<void> = () => promiseResolvedWith(undefined);\n  let closeAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let abortAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingSink.start !== undefined) {\n    startAlgorithm = () => underlyingSink.start!(controller);\n  }\n  if (underlyingSink.write !== undefined) {\n    writeAlgorithm = chunk => underlyingSink.write!(chunk, controller);\n  }\n  if (underlyingSink.close !== undefined) {\n    closeAlgorithm = () => underlyingSink.close!();\n  }\n  if (underlyingSink.abort !== undefined) {\n    abortAlgorithm = reason => underlyingSink.abort!(reason);\n  }\n\n  SetUpWritableStreamDefaultController(\n    stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm\n  );\n}\n\n// ClearAlgorithms may be called twice. Erroring the same stream in multiple ways will often result in redundant calls.\nfunction WritableStreamDefaultControllerClearAlgorithms(controller: WritableStreamDefaultController<any>) {\n  controller._writeAlgorithm = undefined!;\n  controller._closeAlgorithm = undefined!;\n  controller._abortAlgorithm = undefined!;\n  controller._strategySizeAlgorithm = undefined!;\n}\n\nfunction WritableStreamDefaultControllerClose<W>(controller: WritableStreamDefaultController<W>) {\n  EnqueueValueWithSize(controller, closeSentinel, 0);\n  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\nfunction WritableStreamDefaultControllerGetChunkSize<W>(controller: WritableStreamDefaultController<W>,\n                                                        chunk: W): number {\n  try {\n    return controller._strategySizeAlgorithm(chunk);\n  } catch (chunkSizeE) {\n    WritableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE);\n    return 1;\n  }\n}\n\nfunction WritableStreamDefaultControllerGetDesiredSize(controller: WritableStreamDefaultController<any>): number {\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\nfunction WritableStreamDefaultControllerWrite<W>(controller: WritableStreamDefaultController<W>,\n                                                 chunk: W,\n                                                 chunkSize: number) {\n  try {\n    EnqueueValueWithSize(controller, chunk, chunkSize);\n  } catch (enqueueE) {\n    WritableStreamDefaultControllerErrorIfNeeded(controller, enqueueE);\n    return;\n  }\n\n  const stream = controller._controlledWritableStream;\n  if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._state === 'writable') {\n    const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n    WritableStreamUpdateBackpressure(stream, backpressure);\n  }\n\n  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\n// Abstract operations for the WritableStreamDefaultController.\n\nfunction WritableStreamDefaultControllerAdvanceQueueIfNeeded<W>(controller: WritableStreamDefaultController<W>) {\n  const stream = controller._controlledWritableStream;\n\n  if (!controller._started) {\n    return;\n  }\n\n  if (stream._inFlightWriteRequest !== undefined) {\n    return;\n  }\n\n  const state = stream._state;\n  assert(state !== 'closed' && state !== 'errored');\n  if (state === 'erroring') {\n    WritableStreamFinishErroring(stream);\n    return;\n  }\n\n  if (controller._queue.length === 0) {\n    return;\n  }\n\n  const value = PeekQueueValue(controller);\n  if (value === closeSentinel) {\n    WritableStreamDefaultControllerProcessClose(controller);\n  } else {\n    WritableStreamDefaultControllerProcessWrite(controller, value);\n  }\n}\n\nfunction WritableStreamDefaultControllerErrorIfNeeded(controller: WritableStreamDefaultController<any>, error: any) {\n  if (controller._controlledWritableStream._state === 'writable') {\n    WritableStreamDefaultControllerError(controller, error);\n  }\n}\n\nfunction WritableStreamDefaultControllerProcessClose(controller: WritableStreamDefaultController<any>) {\n  const stream = controller._controlledWritableStream;\n\n  WritableStreamMarkCloseRequestInFlight(stream);\n\n  DequeueValue(controller);\n  assert(controller._queue.length === 0);\n\n  const sinkClosePromise = controller._closeAlgorithm();\n  WritableStreamDefaultControllerClearAlgorithms(controller);\n  uponPromise(\n    sinkClosePromise,\n    () => {\n      WritableStreamFinishInFlightClose(stream);\n    },\n    reason => {\n      WritableStreamFinishInFlightCloseWithError(stream, reason);\n    }\n  );\n}\n\nfunction WritableStreamDefaultControllerProcessWrite<W>(controller: WritableStreamDefaultController<W>, chunk: W) {\n  const stream = controller._controlledWritableStream;\n\n  WritableStreamMarkFirstWriteRequestInFlight(stream);\n\n  const sinkWritePromise = controller._writeAlgorithm(chunk);\n  uponPromise(\n    sinkWritePromise,\n    () => {\n      WritableStreamFinishInFlightWrite(stream);\n\n      const state = stream._state;\n      assert(state === 'writable' || state === 'erroring');\n\n      DequeueValue(controller);\n\n      if (!WritableStreamCloseQueuedOrInFlight(stream) && state === 'writable') {\n        const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n        WritableStreamUpdateBackpressure(stream, backpressure);\n      }\n\n      WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n    },\n    reason => {\n      if (stream._state === 'writable') {\n        WritableStreamDefaultControllerClearAlgorithms(controller);\n      }\n      WritableStreamFinishInFlightWriteWithError(stream, reason);\n    }\n  );\n}\n\nfunction WritableStreamDefaultControllerGetBackpressure(controller: WritableStreamDefaultController<any>): boolean {\n  const desiredSize = WritableStreamDefaultControllerGetDesiredSize(controller);\n  return desiredSize <= 0;\n}\n\n// A client of WritableStreamDefaultController may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultControllerError(controller: WritableStreamDefaultController<any>, error: any) {\n  const stream = controller._controlledWritableStream;\n\n  assert(stream._state === 'writable');\n\n  WritableStreamDefaultControllerClearAlgorithms(controller);\n  WritableStreamStartErroring(stream, error);\n}\n\n// Helper functions for the WritableStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(`WritableStream.prototype.${name} can only be used on a WritableStream`);\n}\n\n// Helper functions for the WritableStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `WritableStreamDefaultController.prototype.${name} can only be used on a WritableStreamDefaultController`);\n}\n\n\n// Helper functions for the WritableStreamDefaultWriter.\n\nfunction defaultWriterBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `WritableStreamDefaultWriter.prototype.${name} can only be used on a WritableStreamDefaultWriter`);\n}\n\nfunction defaultWriterLockException(name: string): TypeError {\n  return new TypeError('Cannot ' + name + ' a stream using a released writer');\n}\n\nfunction defaultWriterClosedPromiseInitialize(writer: WritableStreamDefaultWriter) {\n  writer._closedPromise = newPromise((resolve, reject) => {\n    writer._closedPromise_resolve = resolve;\n    writer._closedPromise_reject = reject;\n    writer._closedPromiseState = 'pending';\n  });\n}\n\nfunction defaultWriterClosedPromiseInitializeAsRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  defaultWriterClosedPromiseInitialize(writer);\n  defaultWriterClosedPromiseReject(writer, reason);\n}\n\nfunction defaultWriterClosedPromiseInitializeAsResolved(writer: WritableStreamDefaultWriter) {\n  defaultWriterClosedPromiseInitialize(writer);\n  defaultWriterClosedPromiseResolve(writer);\n}\n\nfunction defaultWriterClosedPromiseReject(writer: WritableStreamDefaultWriter, reason: any) {\n  if (writer._closedPromise_reject === undefined) {\n    return;\n  }\n  assert(writer._closedPromiseState === 'pending');\n\n  setPromiseIsHandledToTrue(writer._closedPromise);\n  writer._closedPromise_reject(reason);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'rejected';\n}\n\nfunction defaultWriterClosedPromiseResetToRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  assert(writer._closedPromise_resolve === undefined);\n  assert(writer._closedPromise_reject === undefined);\n  assert(writer._closedPromiseState !== 'pending');\n\n  defaultWriterClosedPromiseInitializeAsRejected(writer, reason);\n}\n\nfunction defaultWriterClosedPromiseResolve(writer: WritableStreamDefaultWriter) {\n  if (writer._closedPromise_resolve === undefined) {\n    return;\n  }\n  assert(writer._closedPromiseState === 'pending');\n\n  writer._closedPromise_resolve(undefined);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'resolved';\n}\n\nfunction defaultWriterReadyPromiseInitialize(writer: WritableStreamDefaultWriter) {\n  writer._readyPromise = newPromise((resolve, reject) => {\n    writer._readyPromise_resolve = resolve;\n    writer._readyPromise_reject = reject;\n  });\n  writer._readyPromiseState = 'pending';\n}\n\nfunction defaultWriterReadyPromiseInitializeAsRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  defaultWriterReadyPromiseInitialize(writer);\n  defaultWriterReadyPromiseReject(writer, reason);\n}\n\nfunction defaultWriterReadyPromiseInitializeAsResolved(writer: WritableStreamDefaultWriter) {\n  defaultWriterReadyPromiseInitialize(writer);\n  defaultWriterReadyPromiseResolve(writer);\n}\n\nfunction defaultWriterReadyPromiseReject(writer: WritableStreamDefaultWriter, reason: any) {\n  if (writer._readyPromise_reject === undefined) {\n    return;\n  }\n\n  setPromiseIsHandledToTrue(writer._readyPromise);\n  writer._readyPromise_reject(reason);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'rejected';\n}\n\nfunction defaultWriterReadyPromiseReset(writer: WritableStreamDefaultWriter) {\n  assert(writer._readyPromise_resolve === undefined);\n  assert(writer._readyPromise_reject === undefined);\n\n  defaultWriterReadyPromiseInitialize(writer);\n}\n\nfunction defaultWriterReadyPromiseResetToRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  assert(writer._readyPromise_resolve === undefined);\n  assert(writer._readyPromise_reject === undefined);\n\n  defaultWriterReadyPromiseInitializeAsRejected(writer, reason);\n}\n\nfunction defaultWriterReadyPromiseResolve(writer: WritableStreamDefaultWriter) {\n  if (writer._readyPromise_resolve === undefined) {\n    return;\n  }\n\n  writer._readyPromise_resolve(undefined);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'fulfilled';\n}\n","/// <reference lib=\"dom\" />\nexport const NativeDOMException: typeof DOMException | undefined =\n  typeof DOMException !== 'undefined' ? DOMException : undefined;\n","/// <reference types=\"node\" />\nimport { NativeDOMException } from './native';\n\ndeclare class DOMExceptionClass extends Error {\n  constructor(message?: string, name?: string);\n\n  name: string;\n  message: string;\n}\n\ntype DOMException = DOMExceptionClass;\ntype DOMExceptionConstructor = typeof DOMExceptionClass;\n\nfunction isDOMExceptionConstructor(ctor: unknown): ctor is DOMExceptionConstructor {\n  if (!(typeof ctor === 'function' || typeof ctor === 'object')) {\n    return false;\n  }\n  try {\n    new (ctor as DOMExceptionConstructor)();\n    return true;\n  } catch {\n    return false;\n  }\n}\n\nfunction createDOMExceptionPolyfill(): DOMExceptionConstructor {\n  // eslint-disable-next-line no-shadow\n  const ctor = function DOMException(this: DOMException, message?: string, name?: string) {\n    this.message = message || '';\n    this.name = name || 'Error';\n    if (Error.captureStackTrace) {\n      Error.captureStackTrace(this, this.constructor);\n    }\n  } as any;\n  ctor.prototype = Object.create(Error.prototype);\n  Object.defineProperty(ctor.prototype, 'constructor', { value: ctor, writable: true, configurable: true });\n  return ctor;\n}\n\n// eslint-disable-next-line no-redeclare\nconst DOMException: DOMExceptionConstructor =\n  isDOMExceptionConstructor(NativeDOMException) ? NativeDOMException : createDOMExceptionPolyfill();\n\nexport { DOMException };\n","import { IsReadableStream, IsReadableStreamLocked, ReadableStream, ReadableStreamCancel } from '../readable-stream';\nimport { AcquireReadableStreamDefaultReader, ReadableStreamDefaultReaderRead } from './default-reader';\nimport { ReadableStreamReaderGenericRelease } from './generic-reader';\nimport {\n  AcquireWritableStreamDefaultWriter,\n  IsWritableStream,\n  IsWritableStreamLocked,\n  WritableStream,\n  WritableStreamAbort,\n  WritableStreamCloseQueuedOrInFlight,\n  WritableStreamDefaultWriterCloseWithErrorPropagation,\n  WritableStreamDefaultWriterRelease,\n  WritableStreamDefaultWriterWrite\n} from '../writable-stream';\nimport assert from '../../stub/assert';\nimport {\n  newPromise,\n  PerformPromiseThen,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  uponFulfillment,\n  uponPromise,\n  uponRejection\n} from '../helpers/webidl';\nimport { noop } from '../../utils';\nimport { AbortSignal, isAbortSignal } from '../abort-signal';\nimport { DOMException } from '../../stub/dom-exception';\n\nexport function ReadableStreamPipeTo<T>(source: ReadableStream<T>,\n                                        dest: WritableStream<T>,\n                                        preventClose: boolean,\n                                        preventAbort: boolean,\n                                        preventCancel: boolean,\n                                        signal: AbortSignal | undefined): Promise<undefined> {\n  assert(IsReadableStream(source));\n  assert(IsWritableStream(dest));\n  assert(typeof preventClose === 'boolean');\n  assert(typeof preventAbort === 'boolean');\n  assert(typeof preventCancel === 'boolean');\n  assert(signal === undefined || isAbortSignal(signal));\n  assert(!IsReadableStreamLocked(source));\n  assert(!IsWritableStreamLocked(dest));\n\n  const reader = AcquireReadableStreamDefaultReader<T>(source);\n  const writer = AcquireWritableStreamDefaultWriter<T>(dest);\n\n  source._disturbed = true;\n\n  let shuttingDown = false;\n\n  // This is used to keep track of the spec's requirement that we wait for ongoing writes during shutdown.\n  let currentWrite = promiseResolvedWith<void>(undefined);\n\n  return newPromise((resolve, reject) => {\n    let abortAlgorithm: () => void;\n    if (signal !== undefined) {\n      abortAlgorithm = () => {\n        const error = new DOMException('Aborted', 'AbortError');\n        const actions: Array<() => Promise<void>> = [];\n        if (!preventAbort) {\n          actions.push(() => {\n            if (dest._state === 'writable') {\n              return WritableStreamAbort(dest, error);\n            }\n            return promiseResolvedWith(undefined);\n          });\n        }\n        if (!preventCancel) {\n          actions.push(() => {\n            if (source._state === 'readable') {\n              return ReadableStreamCancel(source, error);\n            }\n            return promiseResolvedWith(undefined);\n          });\n        }\n        shutdownWithAction(() => Promise.all(actions.map(action => action())), true, error);\n      };\n\n      if (signal.aborted) {\n        abortAlgorithm();\n        return;\n      }\n\n      signal.addEventListener('abort', abortAlgorithm);\n    }\n\n    // Using reader and writer, read all chunks from this and write them to dest\n    // - Backpressure must be enforced\n    // - Shutdown must stop all activity\n    function pipeLoop() {\n      return newPromise<void>((resolveLoop, rejectLoop) => {\n        function next(done: boolean) {\n          if (done) {\n            resolveLoop();\n          } else {\n            // Use `PerformPromiseThen` instead of `uponPromise` to avoid\n            // adding unnecessary `.catch(rethrowAssertionErrorRejection)` handlers\n            PerformPromiseThen(pipeStep(), next, rejectLoop);\n          }\n        }\n\n        next(false);\n      });\n    }\n\n    function pipeStep(): Promise<boolean> {\n      if (shuttingDown) {\n        return promiseResolvedWith(true);\n      }\n\n      return PerformPromiseThen(writer._readyPromise, () => {\n        return newPromise<boolean>((resolveRead, rejectRead) => {\n          ReadableStreamDefaultReaderRead(\n            reader,\n            {\n              _chunkSteps: chunk => {\n                currentWrite = PerformPromiseThen(WritableStreamDefaultWriterWrite(writer, chunk), undefined, noop);\n                resolveRead(false);\n              },\n              _closeSteps: () => resolveRead(true),\n              _errorSteps: rejectRead\n            }\n          );\n        });\n      });\n    }\n\n    // Errors must be propagated forward\n    isOrBecomesErrored(source, reader._closedPromise, storedError => {\n      if (!preventAbort) {\n        shutdownWithAction(() => WritableStreamAbort(dest, storedError), true, storedError);\n      } else {\n        shutdown(true, storedError);\n      }\n    });\n\n    // Errors must be propagated backward\n    isOrBecomesErrored(dest, writer._closedPromise, storedError => {\n      if (!preventCancel) {\n        shutdownWithAction(() => ReadableStreamCancel(source, storedError), true, storedError);\n      } else {\n        shutdown(true, storedError);\n      }\n    });\n\n    // Closing must be propagated forward\n    isOrBecomesClosed(source, reader._closedPromise, () => {\n      if (!preventClose) {\n        shutdownWithAction(() => WritableStreamDefaultWriterCloseWithErrorPropagation(writer));\n      } else {\n        shutdown();\n      }\n    });\n\n    // Closing must be propagated backward\n    if (WritableStreamCloseQueuedOrInFlight(dest) || dest._state === 'closed') {\n      const destClosed = new TypeError('the destination writable stream closed before all data could be piped to it');\n\n      if (!preventCancel) {\n        shutdownWithAction(() => ReadableStreamCancel(source, destClosed), true, destClosed);\n      } else {\n        shutdown(true, destClosed);\n      }\n    }\n\n    setPromiseIsHandledToTrue(pipeLoop());\n\n    function waitForWritesToFinish(): Promise<void> {\n      // Another write may have started while we were waiting on this currentWrite, so we have to be sure to wait\n      // for that too.\n      const oldCurrentWrite = currentWrite;\n      return PerformPromiseThen(\n        currentWrite,\n        () => oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined\n      );\n    }\n\n    function isOrBecomesErrored(stream: ReadableStream | WritableStream,\n                                promise: Promise<void>,\n                                action: (reason: any) => void) {\n      if (stream._state === 'errored') {\n        action(stream._storedError);\n      } else {\n        uponRejection(promise, action);\n      }\n    }\n\n    function isOrBecomesClosed(stream: ReadableStream | WritableStream, promise: Promise<void>, action: () => void) {\n      if (stream._state === 'closed') {\n        action();\n      } else {\n        uponFulfillment(promise, action);\n      }\n    }\n\n    function shutdownWithAction(action: () => Promise<unknown>, originalIsError?: boolean, originalError?: any) {\n      if (shuttingDown) {\n        return;\n      }\n      shuttingDown = true;\n\n      if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {\n        uponFulfillment(waitForWritesToFinish(), doTheRest);\n      } else {\n        doTheRest();\n      }\n\n      function doTheRest() {\n        uponPromise(\n          action(),\n          () => finalize(originalIsError, originalError),\n          newError => finalize(true, newError)\n        );\n      }\n    }\n\n    function shutdown(isError?: boolean, error?: any) {\n      if (shuttingDown) {\n        return;\n      }\n      shuttingDown = true;\n\n      if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {\n        uponFulfillment(waitForWritesToFinish(), () => finalize(isError, error));\n      } else {\n        finalize(isError, error);\n      }\n    }\n\n    function finalize(isError?: boolean, error?: any) {\n      WritableStreamDefaultWriterRelease(writer);\n      ReadableStreamReaderGenericRelease(reader);\n\n      if (signal !== undefined) {\n        signal.removeEventListener('abort', abortAlgorithm);\n      }\n      if (isError) {\n        reject(error);\n      } else {\n        resolve(undefined);\n      }\n    }\n  });\n}\n","import { QueuingStrategySizeCallback } from '../queuing-strategy';\nimport assert from '../../stub/assert';\nimport { DequeueValue, EnqueueValueWithSize, QueuePair, ResetQueue } from '../abstract-ops/queue-with-sizes';\nimport {\n  ReadableStreamAddReadRequest,\n  ReadableStreamFulfillReadRequest,\n  ReadableStreamGetNumReadRequests,\n  ReadRequest\n} from './default-reader';\nimport { SimpleQueue } from '../simple-queue';\nimport { IsReadableStreamLocked, ReadableStream, ReadableStreamClose, ReadableStreamError } from '../readable-stream';\nimport { ValidatedUnderlyingSource } from './underlying-source';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { CancelSteps, PullSteps } from '../abstract-ops/internal-methods';\nimport { promiseResolvedWith, uponPromise } from '../helpers/webidl';\n\n/**\n * Allows control of a {@link ReadableStream | readable stream}'s state and internal queue.\n *\n * @public\n */\nexport class ReadableStreamDefaultController<R> {\n  /** @internal */\n  _controlledReadableStream!: ReadableStream<R>;\n  /** @internal */\n  _queue!: SimpleQueue<QueuePair<R>>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _closeRequested!: boolean;\n  /** @internal */\n  _pullAgain!: boolean;\n  /** @internal */\n  _pulling !: boolean;\n  /** @internal */\n  _strategySizeAlgorithm!: QueuingStrategySizeCallback<R>;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _pullAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _cancelAlgorithm!: (reason: any) => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is\n   * over-full. An underlying source ought to use this information to determine when and how to apply backpressure.\n   */\n  get desiredSize(): number | null {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('desiredSize');\n    }\n\n    return ReadableStreamDefaultControllerGetDesiredSize(this);\n  }\n\n  /**\n   * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from\n   * the stream, but once those are read, the stream will become closed.\n   */\n  close(): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('close');\n    }\n\n    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {\n      throw new TypeError('The stream is not in a state that permits close');\n    }\n\n    ReadableStreamDefaultControllerClose(this);\n  }\n\n  /**\n   * Enqueues the given chunk `chunk` in the controlled readable stream.\n   */\n  enqueue(chunk: R): void;\n  enqueue(chunk: R = undefined!): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('enqueue');\n    }\n\n    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {\n      throw new TypeError('The stream is not in a state that permits enqueue');\n    }\n\n    return ReadableStreamDefaultControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.\n   */\n  error(e: any = undefined): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n\n    ReadableStreamDefaultControllerError(this, e);\n  }\n\n  /** @internal */\n  [CancelSteps](reason: any): Promise<void> {\n    ResetQueue(this);\n    const result = this._cancelAlgorithm(reason);\n    ReadableStreamDefaultControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [PullSteps](readRequest: ReadRequest<R>): void {\n    const stream = this._controlledReadableStream;\n\n    if (this._queue.length > 0) {\n      const chunk = DequeueValue(this);\n\n      if (this._closeRequested && this._queue.length === 0) {\n        ReadableStreamDefaultControllerClearAlgorithms(this);\n        ReadableStreamClose(stream);\n      } else {\n        ReadableStreamDefaultControllerCallPullIfNeeded(this);\n      }\n\n      readRequest._chunkSteps(chunk);\n    } else {\n      ReadableStreamAddReadRequest(stream, readRequest);\n      ReadableStreamDefaultControllerCallPullIfNeeded(this);\n    }\n  }\n}\n\nObject.defineProperties(ReadableStreamDefaultController.prototype, {\n  close: { enumerable: true },\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Abstract operations for the ReadableStreamDefaultController.\n\nfunction IsReadableStreamDefaultController<R = any>(x: any): x is ReadableStreamDefaultController<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableStream')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamDefaultController;\n}\n\nfunction ReadableStreamDefaultControllerCallPullIfNeeded(controller: ReadableStreamDefaultController<any>): void {\n  const shouldPull = ReadableStreamDefaultControllerShouldCallPull(controller);\n  if (!shouldPull) {\n    return;\n  }\n\n  if (controller._pulling) {\n    controller._pullAgain = true;\n    return;\n  }\n\n  assert(!controller._pullAgain);\n\n  controller._pulling = true;\n\n  const pullPromise = controller._pullAlgorithm();\n  uponPromise(\n    pullPromise,\n    () => {\n      controller._pulling = false;\n\n      if (controller._pullAgain) {\n        controller._pullAgain = false;\n        ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n      }\n    },\n    e => {\n      ReadableStreamDefaultControllerError(controller, e);\n    }\n  );\n}\n\nfunction ReadableStreamDefaultControllerShouldCallPull(controller: ReadableStreamDefaultController<any>): boolean {\n  const stream = controller._controlledReadableStream;\n\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return false;\n  }\n\n  if (!controller._started) {\n    return false;\n  }\n\n  if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    return true;\n  }\n\n  const desiredSize = ReadableStreamDefaultControllerGetDesiredSize(controller);\n  assert(desiredSize !== null);\n  if (desiredSize! > 0) {\n    return true;\n  }\n\n  return false;\n}\n\nfunction ReadableStreamDefaultControllerClearAlgorithms(controller: ReadableStreamDefaultController<any>) {\n  controller._pullAlgorithm = undefined!;\n  controller._cancelAlgorithm = undefined!;\n  controller._strategySizeAlgorithm = undefined!;\n}\n\n// A client of ReadableStreamDefaultController may use these functions directly to bypass state check.\n\nexport function ReadableStreamDefaultControllerClose(controller: ReadableStreamDefaultController<any>) {\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return;\n  }\n\n  const stream = controller._controlledReadableStream;\n\n  controller._closeRequested = true;\n\n  if (controller._queue.length === 0) {\n    ReadableStreamDefaultControllerClearAlgorithms(controller);\n    ReadableStreamClose(stream);\n  }\n}\n\nexport function ReadableStreamDefaultControllerEnqueue<R>(\n  controller: ReadableStreamDefaultController<R>,\n  chunk: R\n): void {\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return;\n  }\n\n  const stream = controller._controlledReadableStream;\n\n  if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    ReadableStreamFulfillReadRequest(stream, chunk, false);\n  } else {\n    let chunkSize;\n    try {\n      chunkSize = controller._strategySizeAlgorithm(chunk);\n    } catch (chunkSizeE) {\n      ReadableStreamDefaultControllerError(controller, chunkSizeE);\n      throw chunkSizeE;\n    }\n\n    try {\n      EnqueueValueWithSize(controller, chunk, chunkSize);\n    } catch (enqueueE) {\n      ReadableStreamDefaultControllerError(controller, enqueueE);\n      throw enqueueE;\n    }\n  }\n\n  ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n}\n\nexport function ReadableStreamDefaultControllerError(controller: ReadableStreamDefaultController<any>, e: any) {\n  const stream = controller._controlledReadableStream;\n\n  if (stream._state !== 'readable') {\n    return;\n  }\n\n  ResetQueue(controller);\n\n  ReadableStreamDefaultControllerClearAlgorithms(controller);\n  ReadableStreamError(stream, e);\n}\n\nexport function ReadableStreamDefaultControllerGetDesiredSize(\n  controller: ReadableStreamDefaultController<any>\n): number | null {\n  const state = controller._controlledReadableStream._state;\n\n  if (state === 'errored') {\n    return null;\n  }\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\n// This is used in the implementation of TransformStream.\nexport function ReadableStreamDefaultControllerHasBackpressure(\n  controller: ReadableStreamDefaultController<any>\n): boolean {\n  if (ReadableStreamDefaultControllerShouldCallPull(controller)) {\n    return false;\n  }\n\n  return true;\n}\n\nexport function ReadableStreamDefaultControllerCanCloseOrEnqueue(\n  controller: ReadableStreamDefaultController<any>\n): boolean {\n  const state = controller._controlledReadableStream._state;\n\n  if (!controller._closeRequested && state === 'readable') {\n    return true;\n  }\n\n  return false;\n}\n\nexport function SetUpReadableStreamDefaultController<R>(stream: ReadableStream<R>,\n                                                        controller: ReadableStreamDefaultController<R>,\n                                                        startAlgorithm: () => void | PromiseLike<void>,\n                                                        pullAlgorithm: () => Promise<void>,\n                                                        cancelAlgorithm: (reason: any) => Promise<void>,\n                                                        highWaterMark: number,\n                                                        sizeAlgorithm: QueuingStrategySizeCallback<R>) {\n  assert(stream._readableStreamController === undefined);\n\n  controller._controlledReadableStream = stream;\n\n  controller._queue = undefined!;\n  controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._started = false;\n  controller._closeRequested = false;\n  controller._pullAgain = false;\n  controller._pulling = false;\n\n  controller._strategySizeAlgorithm = sizeAlgorithm;\n  controller._strategyHWM = highWaterMark;\n\n  controller._pullAlgorithm = pullAlgorithm;\n  controller._cancelAlgorithm = cancelAlgorithm;\n\n  stream._readableStreamController = controller;\n\n  const startResult = startAlgorithm();\n  uponPromise(\n    promiseResolvedWith(startResult),\n    () => {\n      controller._started = true;\n\n      assert(!controller._pulling);\n      assert(!controller._pullAgain);\n\n      ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n    },\n    r => {\n      ReadableStreamDefaultControllerError(controller, r);\n    }\n  );\n}\n\nexport function SetUpReadableStreamDefaultControllerFromUnderlyingSource<R>(\n  stream: ReadableStream<R>,\n  underlyingSource: ValidatedUnderlyingSource<R>,\n  highWaterMark: number,\n  sizeAlgorithm: QueuingStrategySizeCallback<R>\n) {\n  const controller: ReadableStreamDefaultController<R> = Object.create(ReadableStreamDefaultController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let pullAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let cancelAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingSource.start !== undefined) {\n    startAlgorithm = () => underlyingSource.start!(controller);\n  }\n  if (underlyingSource.pull !== undefined) {\n    pullAlgorithm = () => underlyingSource.pull!(controller);\n  }\n  if (underlyingSource.cancel !== undefined) {\n    cancelAlgorithm = reason => underlyingSource.cancel!(reason);\n  }\n\n  SetUpReadableStreamDefaultController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm\n  );\n}\n\n// Helper functions for the ReadableStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamDefaultController.prototype.${name} can only be used on a ReadableStreamDefaultController`);\n}\n","import {\n  CreateReadableByteStream,\n  CreateReadableStream,\n  IsReadableStream,\n  ReadableByteStream,\n  ReadableStream,\n  ReadableStreamCancel,\n  ReadableStreamReader\n} from '../readable-stream';\nimport { ReadableStreamReaderGenericRelease } from './generic-reader';\nimport {\n  AcquireReadableStreamDefaultReader,\n  IsReadableStreamDefaultReader,\n  ReadableStreamDefaultReaderRead,\n  ReadRequest\n} from './default-reader';\nimport {\n  AcquireReadableStreamBYOBReader,\n  IsReadableStreamBYOBReader,\n  ReadableStreamBYOBReaderRead,\n  ReadIntoRequest\n} from './byob-reader';\nimport assert from '../../stub/assert';\nimport { newPromise, promiseResolvedWith, queueMicrotask, uponRejection } from '../helpers/webidl';\nimport {\n  ReadableStreamDefaultController,\n  ReadableStreamDefaultControllerClose,\n  ReadableStreamDefaultControllerEnqueue,\n  ReadableStreamDefaultControllerError\n} from './default-controller';\nimport {\n  IsReadableByteStreamController,\n  ReadableByteStreamControllerClose,\n  ReadableByteStreamControllerEnqueue,\n  ReadableByteStreamControllerError,\n  ReadableByteStreamControllerGetBYOBRequest,\n  ReadableByteStreamControllerRespond,\n  ReadableByteStreamControllerRespondWithNewView\n} from './byte-stream-controller';\nimport { CreateArrayFromList } from '../abstract-ops/ecmascript';\nimport { CloneAsUint8Array } from '../abstract-ops/miscellaneous';\n\nexport function ReadableStreamTee<R>(stream: ReadableStream<R>,\n                                     cloneForBranch2: boolean): [ReadableStream<R>, ReadableStream<R>] {\n  assert(IsReadableStream(stream));\n  assert(typeof cloneForBranch2 === 'boolean');\n  if (IsReadableByteStreamController(stream._readableStreamController)) {\n    return ReadableByteStreamTee(stream as unknown as ReadableByteStream) as\n      unknown as [ReadableStream<R>, ReadableStream<R>];\n  }\n  return ReadableStreamDefaultTee(stream, cloneForBranch2);\n}\n\nexport function ReadableStreamDefaultTee<R>(stream: ReadableStream<R>,\n                                            cloneForBranch2: boolean): [ReadableStream<R>, ReadableStream<R>] {\n  assert(IsReadableStream(stream));\n  assert(typeof cloneForBranch2 === 'boolean');\n\n  const reader = AcquireReadableStreamDefaultReader<R>(stream);\n\n  let reading = false;\n  let readAgain = false;\n  let canceled1 = false;\n  let canceled2 = false;\n  let reason1: any;\n  let reason2: any;\n  let branch1: ReadableStream<R>;\n  let branch2: ReadableStream<R>;\n\n  let resolveCancelPromise: (value: undefined | Promise<undefined>) => void;\n  const cancelPromise = newPromise<undefined>(resolve => {\n    resolveCancelPromise = resolve;\n  });\n\n  function pullAlgorithm(): Promise<void> {\n    if (reading) {\n      readAgain = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgain = false;\n          const chunk1 = chunk;\n          const chunk2 = chunk;\n\n          // There is no way to access the cloning code right now in the reference implementation.\n          // If we add one then we'll need an implementation for serializable objects.\n          // if (!canceled2 && cloneForBranch2) {\n          //   chunk2 = StructuredDeserialize(StructuredSerialize(chunk2));\n          // }\n\n          if (!canceled1) {\n            ReadableStreamDefaultControllerEnqueue(\n              branch1._readableStreamController as ReadableStreamDefaultController<R>,\n              chunk1\n            );\n          }\n          if (!canceled2) {\n            ReadableStreamDefaultControllerEnqueue(\n              branch2._readableStreamController as ReadableStreamDefaultController<R>,\n              chunk2\n            );\n          }\n\n          reading = false;\n          if (readAgain) {\n            pullAlgorithm();\n          }\n        });\n      },\n      _closeSteps: () => {\n        reading = false;\n        if (!canceled1) {\n          ReadableStreamDefaultControllerClose(branch1._readableStreamController as ReadableStreamDefaultController<R>);\n        }\n        if (!canceled2) {\n          ReadableStreamDefaultControllerClose(branch2._readableStreamController as ReadableStreamDefaultController<R>);\n        }\n\n        if (!canceled1 || !canceled2) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function cancel1Algorithm(reason: any): Promise<void> {\n    canceled1 = true;\n    reason1 = reason;\n    if (canceled2) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function cancel2Algorithm(reason: any): Promise<void> {\n    canceled2 = true;\n    reason2 = reason;\n    if (canceled1) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function startAlgorithm() {\n    // do nothing\n  }\n\n  branch1 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel1Algorithm);\n  branch2 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel2Algorithm);\n\n  uponRejection(reader._closedPromise, (r: any) => {\n    ReadableStreamDefaultControllerError(branch1._readableStreamController as ReadableStreamDefaultController<R>, r);\n    ReadableStreamDefaultControllerError(branch2._readableStreamController as ReadableStreamDefaultController<R>, r);\n    if (!canceled1 || !canceled2) {\n      resolveCancelPromise(undefined);\n    }\n  });\n\n  return [branch1, branch2];\n}\n\nexport function ReadableByteStreamTee(stream: ReadableByteStream): [ReadableByteStream, ReadableByteStream] {\n  assert(IsReadableStream(stream));\n  assert(IsReadableByteStreamController(stream._readableStreamController));\n\n  let reader: ReadableStreamReader<Uint8Array> = AcquireReadableStreamDefaultReader(stream);\n  let reading = false;\n  let readAgainForBranch1 = false;\n  let readAgainForBranch2 = false;\n  let canceled1 = false;\n  let canceled2 = false;\n  let reason1: any;\n  let reason2: any;\n  let branch1: ReadableByteStream;\n  let branch2: ReadableByteStream;\n\n  let resolveCancelPromise: (value: undefined | Promise<undefined>) => void;\n  const cancelPromise = newPromise<void>(resolve => {\n    resolveCancelPromise = resolve;\n  });\n\n  function forwardReaderError(thisReader: ReadableStreamReader<Uint8Array>) {\n    uponRejection(thisReader._closedPromise, r => {\n      if (thisReader !== reader) {\n        return;\n      }\n      ReadableByteStreamControllerError(branch1._readableStreamController, r);\n      ReadableByteStreamControllerError(branch2._readableStreamController, r);\n      if (!canceled1 || !canceled2) {\n        resolveCancelPromise(undefined);\n      }\n    });\n  }\n\n  function pullWithDefaultReader() {\n    if (IsReadableStreamBYOBReader(reader)) {\n      assert(reader._readIntoRequests.length === 0);\n      ReadableStreamReaderGenericRelease(reader);\n\n      reader = AcquireReadableStreamDefaultReader(stream);\n      forwardReaderError(reader);\n    }\n\n    const readRequest: ReadRequest<Uint8Array> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgainForBranch1 = false;\n          readAgainForBranch2 = false;\n\n          const chunk1 = chunk;\n          let chunk2 = chunk;\n          if (!canceled1 && !canceled2) {\n            try {\n              chunk2 = CloneAsUint8Array(chunk);\n            } catch (cloneE) {\n              ReadableByteStreamControllerError(branch1._readableStreamController, cloneE);\n              ReadableByteStreamControllerError(branch2._readableStreamController, cloneE);\n              resolveCancelPromise(ReadableStreamCancel(stream, cloneE));\n              return;\n            }\n          }\n\n          if (!canceled1) {\n            ReadableByteStreamControllerEnqueue(branch1._readableStreamController, chunk1);\n          }\n          if (!canceled2) {\n            ReadableByteStreamControllerEnqueue(branch2._readableStreamController, chunk2);\n          }\n\n          reading = false;\n          if (readAgainForBranch1) {\n            pull1Algorithm();\n          } else if (readAgainForBranch2) {\n            pull2Algorithm();\n          }\n        });\n      },\n      _closeSteps: () => {\n        reading = false;\n        if (!canceled1) {\n          ReadableByteStreamControllerClose(branch1._readableStreamController);\n        }\n        if (!canceled2) {\n          ReadableByteStreamControllerClose(branch2._readableStreamController);\n        }\n        if (branch1._readableStreamController._pendingPullIntos.length > 0) {\n          ReadableByteStreamControllerRespond(branch1._readableStreamController, 0);\n        }\n        if (branch2._readableStreamController._pendingPullIntos.length > 0) {\n          ReadableByteStreamControllerRespond(branch2._readableStreamController, 0);\n        }\n        if (!canceled1 || !canceled2) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n  }\n\n  function pullWithBYOBReader(view: ArrayBufferView, forBranch2: boolean) {\n    if (IsReadableStreamDefaultReader<Uint8Array>(reader)) {\n      assert(reader._readRequests.length === 0);\n      ReadableStreamReaderGenericRelease(reader);\n\n      reader = AcquireReadableStreamBYOBReader(stream);\n      forwardReaderError(reader);\n    }\n\n    const byobBranch = forBranch2 ? branch2 : branch1;\n    const otherBranch = forBranch2 ? branch1 : branch2;\n\n    const readIntoRequest: ReadIntoRequest<ArrayBufferView> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgainForBranch1 = false;\n          readAgainForBranch2 = false;\n\n          const byobCanceled = forBranch2 ? canceled2 : canceled1;\n          const otherCanceled = forBranch2 ? canceled1 : canceled2;\n\n          if (!otherCanceled) {\n            let clonedChunk;\n            try {\n              clonedChunk = CloneAsUint8Array(chunk);\n            } catch (cloneE) {\n              ReadableByteStreamControllerError(byobBranch._readableStreamController, cloneE);\n              ReadableByteStreamControllerError(otherBranch._readableStreamController, cloneE);\n              resolveCancelPromise(ReadableStreamCancel(stream, cloneE));\n              return;\n            }\n            if (!byobCanceled) {\n              ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n            }\n            ReadableByteStreamControllerEnqueue(otherBranch._readableStreamController, clonedChunk);\n          } else if (!byobCanceled) {\n            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n          }\n\n          reading = false;\n          if (readAgainForBranch1) {\n            pull1Algorithm();\n          } else if (readAgainForBranch2) {\n            pull2Algorithm();\n          }\n        });\n      },\n      _closeSteps: chunk => {\n        reading = false;\n\n        const byobCanceled = forBranch2 ? canceled2 : canceled1;\n        const otherCanceled = forBranch2 ? canceled1 : canceled2;\n\n        if (!byobCanceled) {\n          ReadableByteStreamControllerClose(byobBranch._readableStreamController);\n        }\n        if (!otherCanceled) {\n          ReadableByteStreamControllerClose(otherBranch._readableStreamController);\n        }\n\n        if (chunk !== undefined) {\n          assert(chunk.byteLength === 0);\n\n          if (!byobCanceled) {\n            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n          }\n          if (!otherCanceled && otherBranch._readableStreamController._pendingPullIntos.length > 0) {\n            ReadableByteStreamControllerRespond(otherBranch._readableStreamController, 0);\n          }\n        }\n\n        if (!byobCanceled || !otherCanceled) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamBYOBReaderRead(reader, view, readIntoRequest);\n  }\n\n  function pull1Algorithm(): Promise<void> {\n    if (reading) {\n      readAgainForBranch1 = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch1._readableStreamController);\n    if (byobRequest === null) {\n      pullWithDefaultReader();\n    } else {\n      pullWithBYOBReader(byobRequest._view!, false);\n    }\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function pull2Algorithm(): Promise<void> {\n    if (reading) {\n      readAgainForBranch2 = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch2._readableStreamController);\n    if (byobRequest === null) {\n      pullWithDefaultReader();\n    } else {\n      pullWithBYOBReader(byobRequest._view!, true);\n    }\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function cancel1Algorithm(reason: any): Promise<void> {\n    canceled1 = true;\n    reason1 = reason;\n    if (canceled2) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function cancel2Algorithm(reason: any): Promise<void> {\n    canceled2 = true;\n    reason2 = reason;\n    if (canceled1) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function startAlgorithm(): void {\n    return;\n  }\n\n  branch1 = CreateReadableByteStream(startAlgorithm, pull1Algorithm, cancel1Algorithm);\n  branch2 = CreateReadableByteStream(startAlgorithm, pull2Algorithm, cancel2Algorithm);\n\n  forwardReaderError(reader);\n\n  return [branch1, branch2];\n}\n","import { assertDictionary, assertFunction, convertUnsignedLongLongWithEnforceRange } from './basic';\nimport {\n  ReadableStreamController,\n  UnderlyingByteSource,\n  UnderlyingDefaultOrByteSource,\n  UnderlyingDefaultOrByteSourcePullCallback,\n  UnderlyingDefaultOrByteSourceStartCallback,\n  UnderlyingSource,\n  UnderlyingSourceCancelCallback,\n  ValidatedUnderlyingDefaultOrByteSource\n} from '../readable-stream/underlying-source';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\n\nexport function convertUnderlyingDefaultOrByteSource<R>(\n  source: UnderlyingSource<R> | UnderlyingByteSource | null,\n  context: string\n): ValidatedUnderlyingDefaultOrByteSource<R> {\n  assertDictionary(source, context);\n  const original = source as (UnderlyingDefaultOrByteSource<R> | null);\n  const autoAllocateChunkSize = original?.autoAllocateChunkSize;\n  const cancel = original?.cancel;\n  const pull = original?.pull;\n  const start = original?.start;\n  const type = original?.type;\n  return {\n    autoAllocateChunkSize: autoAllocateChunkSize === undefined ?\n      undefined :\n      convertUnsignedLongLongWithEnforceRange(\n        autoAllocateChunkSize,\n        `${context} has member 'autoAllocateChunkSize' that`\n      ),\n    cancel: cancel === undefined ?\n      undefined :\n      convertUnderlyingSourceCancelCallback(cancel, original!, `${context} has member 'cancel' that`),\n    pull: pull === undefined ?\n      undefined :\n      convertUnderlyingSourcePullCallback(pull, original!, `${context} has member 'pull' that`),\n    start: start === undefined ?\n      undefined :\n      convertUnderlyingSourceStartCallback(start, original!, `${context} has member 'start' that`),\n    type: type === undefined ? undefined : convertReadableStreamType(type, `${context} has member 'type' that`)\n  };\n}\n\nfunction convertUnderlyingSourceCancelCallback(\n  fn: UnderlyingSourceCancelCallback,\n  original: UnderlyingDefaultOrByteSource,\n  context: string\n): (reason: any) => Promise<void> {\n  assertFunction(fn, context);\n  return (reason: any) => promiseCall(fn, original, [reason]);\n}\n\nfunction convertUnderlyingSourcePullCallback<R>(\n  fn: UnderlyingDefaultOrByteSourcePullCallback<R>,\n  original: UnderlyingDefaultOrByteSource<R>,\n  context: string\n): (controller: ReadableStreamController<R>) => Promise<void> {\n  assertFunction(fn, context);\n  return (controller: ReadableStreamController<R>) => promiseCall(fn, original, [controller]);\n}\n\nfunction convertUnderlyingSourceStartCallback<R>(\n  fn: UnderlyingDefaultOrByteSourceStartCallback<R>,\n  original: UnderlyingDefaultOrByteSource<R>,\n  context: string\n): UnderlyingDefaultOrByteSourceStartCallback<R> {\n  assertFunction(fn, context);\n  return (controller: ReadableStreamController<R>) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertReadableStreamType(type: string, context: string): 'bytes' {\n  type = `${type}`;\n  if (type !== 'bytes') {\n    throw new TypeError(`${context} '${type}' is not a valid enumeration value for ReadableStreamType`);\n  }\n  return type;\n}\n","import { assertDictionary } from './basic';\nimport { ReadableStreamGetReaderOptions } from '../readable-stream/reader-options';\n\nexport function convertReaderOptions(options: ReadableStreamGetReaderOptions | null | undefined,\n                                     context: string): ReadableStreamGetReaderOptions {\n  assertDictionary(options, context);\n  const mode = options?.mode;\n  return {\n    mode: mode === undefined ? undefined : convertReadableStreamReaderMode(mode, `${context} has member 'mode' that`)\n  };\n}\n\nfunction convertReadableStreamReaderMode(mode: string, context: string): 'byob' {\n  mode = `${mode}`;\n  if (mode !== 'byob') {\n    throw new TypeError(`${context} '${mode}' is not a valid enumeration value for ReadableStreamReaderMode`);\n  }\n  return mode;\n}\n","import { assertDictionary } from './basic';\nimport {\n  ReadableStreamIteratorOptions,\n  ValidatedReadableStreamIteratorOptions\n} from '../readable-stream/iterator-options';\n\nexport function convertIteratorOptions(options: ReadableStreamIteratorOptions | null | undefined,\n                                       context: string): ValidatedReadableStreamIteratorOptions {\n  assertDictionary(options, context);\n  const preventCancel = options?.preventCancel;\n  return { preventCancel: Boolean(preventCancel) };\n}\n","import { assertDictionary } from './basic';\nimport { StreamPipeOptions, ValidatedStreamPipeOptions } from '../readable-stream/pipe-options';\nimport { AbortSignal, isAbortSignal } from '../abort-signal';\n\nexport function convertPipeOptions(options: StreamPipeOptions | null | undefined,\n                                   context: string): ValidatedStreamPipeOptions {\n  assertDictionary(options, context);\n  const preventAbort = options?.preventAbort;\n  const preventCancel = options?.preventCancel;\n  const preventClose = options?.preventClose;\n  const signal = options?.signal;\n  if (signal !== undefined) {\n    assertAbortSignal(signal, `${context} has member 'signal' that`);\n  }\n  return {\n    preventAbort: Boolean(preventAbort),\n    preventCancel: Boolean(preventCancel),\n    preventClose: Boolean(preventClose),\n    signal\n  };\n}\n\nfunction assertAbortSignal(signal: unknown, context: string): asserts signal is AbortSignal {\n  if (!isAbortSignal(signal)) {\n    throw new TypeError(`${context} is not an AbortSignal.`);\n  }\n}\n","import { assertDictionary, assertRequiredField } from './basic';\nimport { ReadableStream } from '../readable-stream';\nimport { WritableStream } from '../writable-stream';\nimport { assertReadableStream } from './readable-stream';\nimport { assertWritableStream } from './writable-stream';\n\nexport function convertReadableWritablePair<RS extends ReadableStream, WS extends WritableStream>(\n  pair: { readable: RS; writable: WS } | null | undefined,\n  context: string\n): { readable: RS; writable: WS } {\n  assertDictionary(pair, context);\n\n  const readable = pair?.readable;\n  assertRequiredField(readable, 'readable', 'ReadableWritablePair');\n  assertReadableStream(readable, `${context} has member 'readable' that`);\n\n  const writable = pair?.writable;\n  assertRequiredField(writable, 'writable', 'ReadableWritablePair');\n  assertWritableStream(writable, `${context} has member 'writable' that`);\n\n  return { readable, writable };\n}\n","import assert from '../stub/assert';\nimport {\n  promiseRejectedWith,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  transformPromiseWith\n} from './helpers/webidl';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { AcquireReadableStreamAsyncIterator, ReadableStreamAsyncIterator } from './readable-stream/async-iterator';\nimport { defaultReaderClosedPromiseReject, defaultReaderClosedPromiseResolve } from './readable-stream/generic-reader';\nimport {\n  AcquireReadableStreamDefaultReader,\n  IsReadableStreamDefaultReader,\n  ReadableStreamDefaultReader,\n  ReadableStreamDefaultReadResult\n} from './readable-stream/default-reader';\nimport {\n  AcquireReadableStreamBYOBReader,\n  IsReadableStreamBYOBReader,\n  ReadableStreamBYOBReader,\n  ReadableStreamBYOBReadResult\n} from './readable-stream/byob-reader';\nimport { ReadableStreamPipeTo } from './readable-stream/pipe';\nimport { ReadableStreamTee } from './readable-stream/tee';\nimport { IsWritableStream, IsWritableStreamLocked, WritableStream } from './writable-stream';\nimport { SimpleQueue } from './simple-queue';\nimport {\n  ReadableByteStreamController,\n  ReadableStreamBYOBRequest,\n  SetUpReadableByteStreamController,\n  SetUpReadableByteStreamControllerFromUnderlyingSource\n} from './readable-stream/byte-stream-controller';\nimport {\n  ReadableStreamDefaultController,\n  SetUpReadableStreamDefaultController,\n  SetUpReadableStreamDefaultControllerFromUnderlyingSource\n} from './readable-stream/default-controller';\nimport {\n  UnderlyingByteSource,\n  UnderlyingByteSourcePullCallback,\n  UnderlyingByteSourceStartCallback,\n  UnderlyingSource,\n  UnderlyingSourceCancelCallback,\n  UnderlyingSourcePullCallback,\n  UnderlyingSourceStartCallback\n} from './readable-stream/underlying-source';\nimport { noop } from '../utils';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { CreateArrayFromList } from './abstract-ops/ecmascript';\nimport { CancelSteps } from './abstract-ops/internal-methods';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { assertObject, assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport { convertUnderlyingDefaultOrByteSource } from './validators/underlying-source';\nimport { ReadableStreamGetReaderOptions } from './readable-stream/reader-options';\nimport { convertReaderOptions } from './validators/reader-options';\nimport { StreamPipeOptions, ValidatedStreamPipeOptions } from './readable-stream/pipe-options';\nimport { ReadableStreamIteratorOptions } from './readable-stream/iterator-options';\nimport { convertIteratorOptions } from './validators/iterator-options';\nimport { convertPipeOptions } from './validators/pipe-options';\nimport { ReadableWritablePair } from './readable-stream/readable-writable-pair';\nimport { convertReadableWritablePair } from './validators/readable-writable-pair';\n\nexport type ReadableByteStream = ReadableStream<Uint8Array> & {\n  _readableStreamController: ReadableByteStreamController\n};\n\ntype ReadableStreamState = 'readable' | 'closed' | 'errored';\n\n/**\n * A readable stream represents a source of data, from which you can read.\n *\n * @public\n */\nexport class ReadableStream<R = any> {\n  /** @internal */\n  _state!: ReadableStreamState;\n  /** @internal */\n  _reader: ReadableStreamReader<R> | undefined;\n  /** @internal */\n  _storedError: any;\n  /** @internal */\n  _disturbed!: boolean;\n  /** @internal */\n  _readableStreamController!: ReadableStreamDefaultController<R> | ReadableByteStreamController;\n\n  constructor(underlyingSource: UnderlyingByteSource, strategy?: { highWaterMark?: number; size?: undefined });\n  constructor(underlyingSource?: UnderlyingSource<R>, strategy?: QueuingStrategy<R>);\n  constructor(rawUnderlyingSource: UnderlyingSource<R> | UnderlyingByteSource | null | undefined = {},\n              rawStrategy: QueuingStrategy<R> | null | undefined = {}) {\n    if (rawUnderlyingSource === undefined) {\n      rawUnderlyingSource = null;\n    } else {\n      assertObject(rawUnderlyingSource, 'First parameter');\n    }\n\n    const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');\n    const underlyingSource = convertUnderlyingDefaultOrByteSource(rawUnderlyingSource, 'First parameter');\n\n    InitializeReadableStream(this);\n\n    if (underlyingSource.type === 'bytes') {\n      if (strategy.size !== undefined) {\n        throw new RangeError('The strategy for a byte stream cannot have a size function');\n      }\n      const highWaterMark = ExtractHighWaterMark(strategy, 0);\n      SetUpReadableByteStreamControllerFromUnderlyingSource(\n        this as unknown as ReadableByteStream,\n        underlyingSource,\n        highWaterMark\n      );\n    } else {\n      assert(underlyingSource.type === undefined);\n      const sizeAlgorithm = ExtractSizeAlgorithm(strategy);\n      const highWaterMark = ExtractHighWaterMark(strategy, 1);\n      SetUpReadableStreamDefaultControllerFromUnderlyingSource(\n        this,\n        underlyingSource,\n        highWaterMark,\n        sizeAlgorithm\n      );\n    }\n  }\n\n  /**\n   * Whether or not the readable stream is locked to a {@link ReadableStreamDefaultReader | reader}.\n   */\n  get locked(): boolean {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('locked');\n    }\n\n    return IsReadableStreamLocked(this);\n  }\n\n  /**\n   * Cancels the stream, signaling a loss of interest in the stream by a consumer.\n   *\n   * The supplied `reason` argument will be given to the underlying source's {@link UnderlyingSource.cancel | cancel()}\n   * method, which might or might not use it.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('cancel'));\n    }\n\n    if (IsReadableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot cancel a stream that already has a reader'));\n    }\n\n    return ReadableStreamCancel(this, reason);\n  }\n\n  /**\n   * Creates a {@link ReadableStreamBYOBReader} and locks the stream to the new reader.\n   *\n   * This call behaves the same way as the no-argument variant, except that it only works on readable byte streams,\n   * i.e. streams which were constructed specifically with the ability to handle \"bring your own buffer\" reading.\n   * The returned BYOB reader provides the ability to directly read individual chunks from the stream via its\n   * {@link ReadableStreamBYOBReader.read | read()} method, into developer-supplied buffers, allowing more precise\n   * control over allocation.\n   */\n  getReader({ mode }: { mode: 'byob' }): ReadableStreamBYOBReader;\n  /**\n   * Creates a {@link ReadableStreamDefaultReader} and locks the stream to the new reader.\n   * While the stream is locked, no other reader can be acquired until this one is released.\n   *\n   * This functionality is especially useful for creating abstractions that desire the ability to consume a stream\n   * in its entirety. By getting a reader for the stream, you can ensure nobody else can interleave reads with yours\n   * or cancel the stream, which would interfere with your abstraction.\n   */\n  getReader(): ReadableStreamDefaultReader<R>;\n  getReader(\n    rawOptions: ReadableStreamGetReaderOptions | null | undefined = undefined\n  ): ReadableStreamDefaultReader<R> | ReadableStreamBYOBReader {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('getReader');\n    }\n\n    const options = convertReaderOptions(rawOptions, 'First parameter');\n\n    if (options.mode === undefined) {\n      return AcquireReadableStreamDefaultReader(this);\n    }\n\n    assert(options.mode === 'byob');\n    return AcquireReadableStreamBYOBReader(this as unknown as ReadableByteStream);\n  }\n\n  /**\n   * Provides a convenient, chainable way of piping this readable stream through a transform stream\n   * (or any other `{ writable, readable }` pair). It simply {@link ReadableStream.pipeTo | pipes} the stream\n   * into the writable side of the supplied pair, and returns the readable side for further use.\n   *\n   * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.\n   */\n  pipeThrough<RS extends ReadableStream>(\n    transform: { readable: RS; writable: WritableStream<R> },\n    options?: StreamPipeOptions\n  ): RS;\n  pipeThrough<RS extends ReadableStream>(\n    rawTransform: { readable: RS; writable: WritableStream<R> } | null | undefined,\n    rawOptions: StreamPipeOptions | null | undefined = {}\n  ): RS {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('pipeThrough');\n    }\n    assertRequiredArgument(rawTransform, 1, 'pipeThrough');\n\n    const transform = convertReadableWritablePair(rawTransform, 'First parameter');\n    const options = convertPipeOptions(rawOptions, 'Second parameter');\n\n    if (IsReadableStreamLocked(this)) {\n      throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked ReadableStream');\n    }\n    if (IsWritableStreamLocked(transform.writable)) {\n      throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked WritableStream');\n    }\n\n    const promise = ReadableStreamPipeTo(\n      this, transform.writable, options.preventClose, options.preventAbort, options.preventCancel, options.signal\n    );\n\n    setPromiseIsHandledToTrue(promise);\n\n    return transform.readable;\n  }\n\n  /**\n   * Pipes this readable stream to a given writable stream. The way in which the piping process behaves under\n   * various error conditions can be customized with a number of passed options. It returns a promise that fulfills\n   * when the piping process completes successfully, or rejects if any errors were encountered.\n   *\n   * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.\n   */\n  pipeTo(destination: WritableStream<R>, options?: StreamPipeOptions): Promise<void>;\n  pipeTo(destination: WritableStream<R> | null | undefined,\n         rawOptions: StreamPipeOptions | null | undefined = {}): Promise<void> {\n    if (!IsReadableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('pipeTo'));\n    }\n\n    if (destination === undefined) {\n      return promiseRejectedWith(`Parameter 1 is required in 'pipeTo'.`);\n    }\n    if (!IsWritableStream(destination)) {\n      return promiseRejectedWith(\n        new TypeError(`ReadableStream.prototype.pipeTo's first argument must be a WritableStream`)\n      );\n    }\n\n    let options: ValidatedStreamPipeOptions;\n    try {\n      options = convertPipeOptions(rawOptions, 'Second parameter');\n    } catch (e) {\n      return promiseRejectedWith(e);\n    }\n\n    if (IsReadableStreamLocked(this)) {\n      return promiseRejectedWith(\n        new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream')\n      );\n    }\n    if (IsWritableStreamLocked(destination)) {\n      return promiseRejectedWith(\n        new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream')\n      );\n    }\n\n    return ReadableStreamPipeTo<R>(\n      this, destination, options.preventClose, options.preventAbort, options.preventCancel, options.signal\n    );\n  }\n\n  /**\n   * Tees this readable stream, returning a two-element array containing the two resulting branches as\n   * new {@link ReadableStream} instances.\n   *\n   * Teeing a stream will lock it, preventing any other consumer from acquiring a reader.\n   * To cancel the stream, cancel both of the resulting branches; a composite cancellation reason will then be\n   * propagated to the stream's underlying source.\n   *\n   * Note that the chunks seen in each branch will be the same object. If the chunks are not immutable,\n   * this could allow interference between the two branches.\n   */\n  tee(): [ReadableStream<R>, ReadableStream<R>] {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('tee');\n    }\n\n    const branches = ReadableStreamTee(this, false);\n    return CreateArrayFromList(branches);\n  }\n\n  /**\n   * Asynchronously iterates over the chunks in the stream's internal queue.\n   *\n   * Asynchronously iterating over the stream will lock it, preventing any other consumer from acquiring a reader.\n   * The lock will be released if the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method\n   * is called, e.g. by breaking out of the loop.\n   *\n   * By default, calling the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method will also\n   * cancel the stream. To prevent this, use the stream's {@link ReadableStream.values | values()} method, passing\n   * `true` for the `preventCancel` option.\n   */\n  values(options?: ReadableStreamIteratorOptions): ReadableStreamAsyncIterator<R>;\n  values(rawOptions: ReadableStreamIteratorOptions | null | undefined = undefined): ReadableStreamAsyncIterator<R> {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('values');\n    }\n\n    const options = convertIteratorOptions(rawOptions, 'First parameter');\n    return AcquireReadableStreamAsyncIterator<R>(this, options.preventCancel);\n  }\n\n  /**\n   * {@inheritDoc ReadableStream.values}\n   */\n  [Symbol.asyncIterator]: (options?: ReadableStreamIteratorOptions) => ReadableStreamAsyncIterator<R>;\n}\n\nObject.defineProperties(ReadableStream.prototype, {\n  cancel: { enumerable: true },\n  getReader: { enumerable: true },\n  pipeThrough: { enumerable: true },\n  pipeTo: { enumerable: true },\n  tee: { enumerable: true },\n  values: { enumerable: true },\n  locked: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStream.prototype, Symbol.toStringTag, {\n    value: 'ReadableStream',\n    configurable: true\n  });\n}\nif (typeof Symbol.asyncIterator === 'symbol') {\n  Object.defineProperty(ReadableStream.prototype, Symbol.asyncIterator, {\n    value: ReadableStream.prototype.values,\n    writable: true,\n    configurable: true\n  });\n}\n\nexport {\n  ReadableStreamAsyncIterator,\n  ReadableStreamDefaultReadResult,\n  ReadableStreamBYOBReadResult,\n  UnderlyingByteSource,\n  UnderlyingSource,\n  UnderlyingSourceStartCallback,\n  UnderlyingSourcePullCallback,\n  UnderlyingSourceCancelCallback,\n  UnderlyingByteSourceStartCallback,\n  UnderlyingByteSourcePullCallback,\n  StreamPipeOptions,\n  ReadableWritablePair,\n  ReadableStreamIteratorOptions\n};\n\n// Abstract operations for the ReadableStream.\n\n// Throws if and only if startAlgorithm throws.\nexport function CreateReadableStream<R>(startAlgorithm: () => void | PromiseLike<void>,\n                                        pullAlgorithm: () => Promise<void>,\n                                        cancelAlgorithm: (reason: any) => Promise<void>,\n                                        highWaterMark = 1,\n                                        sizeAlgorithm: QueuingStrategySizeCallback<R> = () => 1): ReadableStream<R> {\n  assert(IsNonNegativeNumber(highWaterMark));\n\n  const stream: ReadableStream<R> = Object.create(ReadableStream.prototype);\n  InitializeReadableStream(stream);\n\n  const controller: ReadableStreamDefaultController<R> = Object.create(ReadableStreamDefaultController.prototype);\n  SetUpReadableStreamDefaultController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm\n  );\n\n  return stream;\n}\n\n// Throws if and only if startAlgorithm throws.\nexport function CreateReadableByteStream(\n  startAlgorithm: () => void | PromiseLike<void>,\n  pullAlgorithm: () => Promise<void>,\n  cancelAlgorithm: (reason: any) => Promise<void>\n): ReadableByteStream {\n  const stream: ReadableByteStream = Object.create(ReadableStream.prototype);\n  InitializeReadableStream(stream);\n\n  const controller: ReadableByteStreamController = Object.create(ReadableByteStreamController.prototype);\n  SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, 0, undefined);\n\n  return stream;\n}\n\nfunction InitializeReadableStream(stream: ReadableStream) {\n  stream._state = 'readable';\n  stream._reader = undefined;\n  stream._storedError = undefined;\n  stream._disturbed = false;\n}\n\nexport function IsReadableStream(x: unknown): x is ReadableStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readableStreamController')) {\n    return false;\n  }\n\n  return x instanceof ReadableStream;\n}\n\nexport function IsReadableStreamDisturbed(stream: ReadableStream): boolean {\n  assert(IsReadableStream(stream));\n\n  return stream._disturbed;\n}\n\nexport function IsReadableStreamLocked(stream: ReadableStream): boolean {\n  assert(IsReadableStream(stream));\n\n  if (stream._reader === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamCancel<R>(stream: ReadableStream<R>, reason: any): Promise<undefined> {\n  stream._disturbed = true;\n\n  if (stream._state === 'closed') {\n    return promiseResolvedWith(undefined);\n  }\n  if (stream._state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  ReadableStreamClose(stream);\n\n  const reader = stream._reader;\n  if (reader !== undefined && IsReadableStreamBYOBReader(reader)) {\n    reader._readIntoRequests.forEach(readIntoRequest => {\n      readIntoRequest._closeSteps(undefined);\n    });\n    reader._readIntoRequests = new SimpleQueue();\n  }\n\n  const sourceCancelPromise = stream._readableStreamController[CancelSteps](reason);\n  return transformPromiseWith(sourceCancelPromise, noop);\n}\n\nexport function ReadableStreamClose<R>(stream: ReadableStream<R>): void {\n  assert(stream._state === 'readable');\n\n  stream._state = 'closed';\n\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return;\n  }\n\n  defaultReaderClosedPromiseResolve(reader);\n\n  if (IsReadableStreamDefaultReader<R>(reader)) {\n    reader._readRequests.forEach(readRequest => {\n      readRequest._closeSteps();\n    });\n    reader._readRequests = new SimpleQueue();\n  }\n}\n\nexport function ReadableStreamError<R>(stream: ReadableStream<R>, e: any): void {\n  assert(IsReadableStream(stream));\n  assert(stream._state === 'readable');\n\n  stream._state = 'errored';\n  stream._storedError = e;\n\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return;\n  }\n\n  defaultReaderClosedPromiseReject(reader, e);\n\n  if (IsReadableStreamDefaultReader<R>(reader)) {\n    reader._readRequests.forEach(readRequest => {\n      readRequest._errorSteps(e);\n    });\n\n    reader._readRequests = new SimpleQueue();\n  } else {\n    assert(IsReadableStreamBYOBReader(reader));\n\n    reader._readIntoRequests.forEach(readIntoRequest => {\n      readIntoRequest._errorSteps(e);\n    });\n\n    reader._readIntoRequests = new SimpleQueue();\n  }\n}\n\n// Readers\n\nexport type ReadableStreamReader<R> = ReadableStreamDefaultReader<R> | ReadableStreamBYOBReader;\n\nexport {\n  ReadableStreamDefaultReader,\n  ReadableStreamBYOBReader\n};\n\n// Controllers\n\nexport {\n  ReadableStreamDefaultController,\n  ReadableStreamBYOBRequest,\n  ReadableByteStreamController\n};\n\n// Helper functions for the ReadableStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(`ReadableStream.prototype.${name} can only be used on a ReadableStream`);\n}\n","import { QueuingStrategyInit } from '../queuing-strategy';\nimport { assertDictionary, assertRequiredField, convertUnrestrictedDouble } from './basic';\n\nexport function convertQueuingStrategyInit(init: QueuingStrategyInit | null | undefined,\n                                           context: string): QueuingStrategyInit {\n  assertDictionary(init, context);\n  const highWaterMark = init?.highWaterMark;\n  assertRequiredField(highWaterMark, 'highWaterMark', 'QueuingStrategyInit');\n  return {\n    highWaterMark: convertUnrestrictedDouble(highWaterMark)\n  };\n}\n","import { QueuingStrategy, QueuingStrategyInit } from './queuing-strategy';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategyInit } from './validators/queuing-strategy-init';\n\n// The size function must not have a prototype property nor be a constructor\nconst byteLengthSizeFunction = (chunk: ArrayBufferView): number => {\n  return chunk.byteLength;\n};\ntry {\n  Object.defineProperty(byteLengthSizeFunction, 'name', {\n    value: 'size',\n    configurable: true\n  });\n} catch {\n  // This property is non-configurable in older browsers, so ignore if this throws.\n  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility\n}\n\n/**\n * A queuing strategy that counts the number of bytes in each chunk.\n *\n * @public\n */\nexport default class ByteLengthQueuingStrategy implements QueuingStrategy<ArrayBufferView> {\n  /** @internal */\n  readonly _byteLengthQueuingStrategyHighWaterMark: number;\n\n  constructor(options: QueuingStrategyInit) {\n    assertRequiredArgument(options, 1, 'ByteLengthQueuingStrategy');\n    options = convertQueuingStrategyInit(options, 'First parameter');\n    this._byteLengthQueuingStrategyHighWaterMark = options.highWaterMark;\n  }\n\n  /**\n   * Returns the high water mark provided to the constructor.\n   */\n  get highWaterMark(): number {\n    if (!IsByteLengthQueuingStrategy(this)) {\n      throw byteLengthBrandCheckException('highWaterMark');\n    }\n    return this._byteLengthQueuingStrategyHighWaterMark;\n  }\n\n  /**\n   * Measures the size of `chunk` by returning the value of its `byteLength` property.\n   */\n  get size(): (chunk: ArrayBufferView) => number {\n    if (!IsByteLengthQueuingStrategy(this)) {\n      throw byteLengthBrandCheckException('size');\n    }\n    return byteLengthSizeFunction;\n  }\n}\n\nObject.defineProperties(ByteLengthQueuingStrategy.prototype, {\n  highWaterMark: { enumerable: true },\n  size: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ByteLengthQueuingStrategy.prototype, Symbol.toStringTag, {\n    value: 'ByteLengthQueuingStrategy',\n    configurable: true\n  });\n}\n\n// Helper functions for the ByteLengthQueuingStrategy.\n\nfunction byteLengthBrandCheckException(name: string): TypeError {\n  return new TypeError(`ByteLengthQueuingStrategy.prototype.${name} can only be used on a ByteLengthQueuingStrategy`);\n}\n\nexport function IsByteLengthQueuingStrategy(x: any): x is ByteLengthQueuingStrategy {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_byteLengthQueuingStrategyHighWaterMark')) {\n    return false;\n  }\n\n  return x instanceof ByteLengthQueuingStrategy;\n}\n","import { QueuingStrategy, QueuingStrategyInit } from './queuing-strategy';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategyInit } from './validators/queuing-strategy-init';\n\n// The size function must not have a prototype property nor be a constructor\nconst countSizeFunction = (): 1 => {\n  return 1;\n};\ntry {\n  Object.defineProperty(countSizeFunction, 'name', {\n    value: 'size',\n    configurable: true\n  });\n} catch {\n  // This property is non-configurable in older browsers, so ignore if this throws.\n  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility\n}\n\n/**\n * A queuing strategy that counts the number of chunks.\n *\n * @public\n */\nexport default class CountQueuingStrategy implements QueuingStrategy<any> {\n  /** @internal */\n  readonly _countQueuingStrategyHighWaterMark!: number;\n\n  constructor(options: QueuingStrategyInit) {\n    assertRequiredArgument(options, 1, 'CountQueuingStrategy');\n    options = convertQueuingStrategyInit(options, 'First parameter');\n    this._countQueuingStrategyHighWaterMark = options.highWaterMark;\n  }\n\n  /**\n   * Returns the high water mark provided to the constructor.\n   */\n  get highWaterMark(): number {\n    if (!IsCountQueuingStrategy(this)) {\n      throw countBrandCheckException('highWaterMark');\n    }\n    return this._countQueuingStrategyHighWaterMark;\n  }\n\n  /**\n   * Measures the size of `chunk` by always returning 1.\n   * This ensures that the total queue size is a count of the number of chunks in the queue.\n   */\n  get size(): (chunk: any) => 1 {\n    if (!IsCountQueuingStrategy(this)) {\n      throw countBrandCheckException('size');\n    }\n    return countSizeFunction;\n  }\n}\n\nObject.defineProperties(CountQueuingStrategy.prototype, {\n  highWaterMark: { enumerable: true },\n  size: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(CountQueuingStrategy.prototype, Symbol.toStringTag, {\n    value: 'CountQueuingStrategy',\n    configurable: true\n  });\n}\n\n// Helper functions for the CountQueuingStrategy.\n\nfunction countBrandCheckException(name: string): TypeError {\n  return new TypeError(`CountQueuingStrategy.prototype.${name} can only be used on a CountQueuingStrategy`);\n}\n\nexport function IsCountQueuingStrategy(x: any): x is CountQueuingStrategy {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_countQueuingStrategyHighWaterMark')) {\n    return false;\n  }\n\n  return x instanceof CountQueuingStrategy;\n}\n","import { assertDictionary, assertFunction } from './basic';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\nimport {\n  Transformer,\n  TransformerFlushCallback,\n  TransformerStartCallback,\n  TransformerTransformCallback,\n  ValidatedTransformer\n} from '../transform-stream/transformer';\nimport { TransformStreamDefaultController } from '../transform-stream';\n\nexport function convertTransformer<I, O>(original: Transformer<I, O> | null,\n                                         context: string): ValidatedTransformer<I, O> {\n  assertDictionary(original, context);\n  const flush = original?.flush;\n  const readableType = original?.readableType;\n  const start = original?.start;\n  const transform = original?.transform;\n  const writableType = original?.writableType;\n  return {\n    flush: flush === undefined ?\n      undefined :\n      convertTransformerFlushCallback(flush, original!, `${context} has member 'flush' that`),\n    readableType,\n    start: start === undefined ?\n      undefined :\n      convertTransformerStartCallback(start, original!, `${context} has member 'start' that`),\n    transform: transform === undefined ?\n      undefined :\n      convertTransformerTransformCallback(transform, original!, `${context} has member 'transform' that`),\n    writableType\n  };\n}\n\nfunction convertTransformerFlushCallback<I, O>(\n  fn: TransformerFlushCallback<O>,\n  original: Transformer<I, O>,\n  context: string\n): (controller: TransformStreamDefaultController<O>) => Promise<void> {\n  assertFunction(fn, context);\n  return (controller: TransformStreamDefaultController<O>) => promiseCall(fn, original, [controller]);\n}\n\nfunction convertTransformerStartCallback<I, O>(\n  fn: TransformerStartCallback<O>,\n  original: Transformer<I, O>,\n  context: string\n): TransformerStartCallback<O> {\n  assertFunction(fn, context);\n  return (controller: TransformStreamDefaultController<O>) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertTransformerTransformCallback<I, O>(\n  fn: TransformerTransformCallback<I, O>,\n  original: Transformer<I, O>,\n  context: string\n): (chunk: I, controller: TransformStreamDefaultController<O>) => Promise<void> {\n  assertFunction(fn, context);\n  return (chunk: I, controller: TransformStreamDefaultController<O>) => promiseCall(fn, original, [chunk, controller]);\n}\n","import assert from '../stub/assert';\nimport { newPromise, promiseRejectedWith, promiseResolvedWith, transformPromiseWith } from './helpers/webidl';\nimport { CreateReadableStream, ReadableStream, ReadableStreamDefaultController } from './readable-stream';\nimport {\n  ReadableStreamDefaultControllerCanCloseOrEnqueue,\n  ReadableStreamDefaultControllerClose,\n  ReadableStreamDefaultControllerEnqueue,\n  ReadableStreamDefaultControllerError,\n  ReadableStreamDefaultControllerGetDesiredSize,\n  ReadableStreamDefaultControllerHasBackpressure\n} from './readable-stream/default-controller';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { CreateWritableStream, WritableStream, WritableStreamDefaultControllerErrorIfNeeded } from './writable-stream';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport {\n  Transformer,\n  TransformerFlushCallback,\n  TransformerStartCallback,\n  TransformerTransformCallback,\n  ValidatedTransformer\n} from './transform-stream/transformer';\nimport { convertTransformer } from './validators/transformer';\n\n// Class TransformStream\n\n/**\n * A transform stream consists of a pair of streams: a {@link WritableStream | writable stream},\n * known as its writable side, and a {@link ReadableStream | readable stream}, known as its readable side.\n * In a manner specific to the transform stream in question, writes to the writable side result in new data being\n * made available for reading from the readable side.\n *\n * @public\n */\nexport class TransformStream<I = any, O = any> {\n  /** @internal */\n  _writable!: WritableStream<I>;\n  /** @internal */\n  _readable!: ReadableStream<O>;\n  /** @internal */\n  _backpressure!: boolean;\n  /** @internal */\n  _backpressureChangePromise!: Promise<void>;\n  /** @internal */\n  _backpressureChangePromise_resolve!: () => void;\n  /** @internal */\n  _transformStreamController!: TransformStreamDefaultController<O>;\n\n  constructor(\n    transformer?: Transformer<I, O>,\n    writableStrategy?: QueuingStrategy<I>,\n    readableStrategy?: QueuingStrategy<O>\n  );\n  constructor(rawTransformer: Transformer<I, O> | null | undefined = {},\n              rawWritableStrategy: QueuingStrategy<I> | null | undefined = {},\n              rawReadableStrategy: QueuingStrategy<O> | null | undefined = {}) {\n    if (rawTransformer === undefined) {\n      rawTransformer = null;\n    }\n\n    const writableStrategy = convertQueuingStrategy(rawWritableStrategy, 'Second parameter');\n    const readableStrategy = convertQueuingStrategy(rawReadableStrategy, 'Third parameter');\n\n    const transformer = convertTransformer(rawTransformer, 'First parameter');\n    if (transformer.readableType !== undefined) {\n      throw new RangeError('Invalid readableType specified');\n    }\n    if (transformer.writableType !== undefined) {\n      throw new RangeError('Invalid writableType specified');\n    }\n\n    const readableHighWaterMark = ExtractHighWaterMark(readableStrategy, 0);\n    const readableSizeAlgorithm = ExtractSizeAlgorithm(readableStrategy);\n    const writableHighWaterMark = ExtractHighWaterMark(writableStrategy, 1);\n    const writableSizeAlgorithm = ExtractSizeAlgorithm(writableStrategy);\n\n    let startPromise_resolve!: (value: void | PromiseLike<void>) => void;\n    const startPromise = newPromise<void>(resolve => {\n      startPromise_resolve = resolve;\n    });\n\n    InitializeTransformStream(\n      this, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm\n    );\n    SetUpTransformStreamDefaultControllerFromTransformer(this, transformer);\n\n    if (transformer.start !== undefined) {\n      startPromise_resolve(transformer.start(this._transformStreamController));\n    } else {\n      startPromise_resolve(undefined);\n    }\n  }\n\n  /**\n   * The readable side of the transform stream.\n   */\n  get readable(): ReadableStream<O> {\n    if (!IsTransformStream(this)) {\n      throw streamBrandCheckException('readable');\n    }\n\n    return this._readable;\n  }\n\n  /**\n   * The writable side of the transform stream.\n   */\n  get writable(): WritableStream<I> {\n    if (!IsTransformStream(this)) {\n      throw streamBrandCheckException('writable');\n    }\n\n    return this._writable;\n  }\n}\n\nObject.defineProperties(TransformStream.prototype, {\n  readable: { enumerable: true },\n  writable: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(TransformStream.prototype, Symbol.toStringTag, {\n    value: 'TransformStream',\n    configurable: true\n  });\n}\n\nexport {\n  Transformer,\n  TransformerStartCallback,\n  TransformerFlushCallback,\n  TransformerTransformCallback\n};\n\n// Transform Stream Abstract Operations\n\nexport function CreateTransformStream<I, O>(startAlgorithm: () => void | PromiseLike<void>,\n                                            transformAlgorithm: (chunk: I) => Promise<void>,\n                                            flushAlgorithm: () => Promise<void>,\n                                            writableHighWaterMark = 1,\n                                            writableSizeAlgorithm: QueuingStrategySizeCallback<I> = () => 1,\n                                            readableHighWaterMark = 0,\n                                            readableSizeAlgorithm: QueuingStrategySizeCallback<O> = () => 1) {\n  assert(IsNonNegativeNumber(writableHighWaterMark));\n  assert(IsNonNegativeNumber(readableHighWaterMark));\n\n  const stream: TransformStream<I, O> = Object.create(TransformStream.prototype);\n\n  let startPromise_resolve!: (value: void | PromiseLike<void>) => void;\n  const startPromise = newPromise<void>(resolve => {\n    startPromise_resolve = resolve;\n  });\n\n  InitializeTransformStream(stream, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark,\n                            readableSizeAlgorithm);\n\n  const controller: TransformStreamDefaultController<O> = Object.create(TransformStreamDefaultController.prototype);\n\n  SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);\n\n  const startResult = startAlgorithm();\n  startPromise_resolve(startResult);\n  return stream;\n}\n\nfunction InitializeTransformStream<I, O>(stream: TransformStream<I, O>,\n                                         startPromise: Promise<void>,\n                                         writableHighWaterMark: number,\n                                         writableSizeAlgorithm: QueuingStrategySizeCallback<I>,\n                                         readableHighWaterMark: number,\n                                         readableSizeAlgorithm: QueuingStrategySizeCallback<O>) {\n  function startAlgorithm(): Promise<void> {\n    return startPromise;\n  }\n\n  function writeAlgorithm(chunk: I): Promise<void> {\n    return TransformStreamDefaultSinkWriteAlgorithm(stream, chunk);\n  }\n\n  function abortAlgorithm(reason: any): Promise<void> {\n    return TransformStreamDefaultSinkAbortAlgorithm(stream, reason);\n  }\n\n  function closeAlgorithm(): Promise<void> {\n    return TransformStreamDefaultSinkCloseAlgorithm(stream);\n  }\n\n  stream._writable = CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm,\n                                          writableHighWaterMark, writableSizeAlgorithm);\n\n  function pullAlgorithm(): Promise<void> {\n    return TransformStreamDefaultSourcePullAlgorithm(stream);\n  }\n\n  function cancelAlgorithm(reason: any): Promise<void> {\n    TransformStreamErrorWritableAndUnblockWrite(stream, reason);\n    return promiseResolvedWith(undefined);\n  }\n\n  stream._readable = CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, readableHighWaterMark,\n                                          readableSizeAlgorithm);\n\n  // The [[backpressure]] slot is set to undefined so that it can be initialised by TransformStreamSetBackpressure.\n  stream._backpressure = undefined!;\n  stream._backpressureChangePromise = undefined!;\n  stream._backpressureChangePromise_resolve = undefined!;\n  TransformStreamSetBackpressure(stream, true);\n\n  stream._transformStreamController = undefined!;\n}\n\nfunction IsTransformStream(x: unknown): x is TransformStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_transformStreamController')) {\n    return false;\n  }\n\n  return x instanceof TransformStream;\n}\n\n// This is a no-op if both sides are already errored.\nfunction TransformStreamError(stream: TransformStream, e: any) {\n  ReadableStreamDefaultControllerError(\n    stream._readable._readableStreamController as ReadableStreamDefaultController<any>,\n    e\n  );\n  TransformStreamErrorWritableAndUnblockWrite(stream, e);\n}\n\nfunction TransformStreamErrorWritableAndUnblockWrite(stream: TransformStream, e: any) {\n  TransformStreamDefaultControllerClearAlgorithms(stream._transformStreamController);\n  WritableStreamDefaultControllerErrorIfNeeded(stream._writable._writableStreamController, e);\n  if (stream._backpressure) {\n    // Pretend that pull() was called to permit any pending write() calls to complete. TransformStreamSetBackpressure()\n    // cannot be called from enqueue() or pull() once the ReadableStream is errored, so this will will be the final time\n    // _backpressure is set.\n    TransformStreamSetBackpressure(stream, false);\n  }\n}\n\nfunction TransformStreamSetBackpressure(stream: TransformStream, backpressure: boolean) {\n  // Passes also when called during construction.\n  assert(stream._backpressure !== backpressure);\n\n  if (stream._backpressureChangePromise !== undefined) {\n    stream._backpressureChangePromise_resolve();\n  }\n\n  stream._backpressureChangePromise = newPromise(resolve => {\n    stream._backpressureChangePromise_resolve = resolve;\n  });\n\n  stream._backpressure = backpressure;\n}\n\n// Class TransformStreamDefaultController\n\n/**\n * Allows control of the {@link ReadableStream} and {@link WritableStream} of the associated {@link TransformStream}.\n *\n * @public\n */\nexport class TransformStreamDefaultController<O> {\n  /** @internal */\n  _controlledTransformStream: TransformStream<any, O>;\n  /** @internal */\n  _transformAlgorithm: (chunk: any) => Promise<void>;\n  /** @internal */\n  _flushAlgorithm: () => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the desired size to fill the readable side’s internal queue. It can be negative, if the queue is over-full.\n   */\n  get desiredSize(): number | null {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('desiredSize');\n    }\n\n    const readableController = this._controlledTransformStream._readable._readableStreamController;\n    return ReadableStreamDefaultControllerGetDesiredSize(readableController as ReadableStreamDefaultController<O>);\n  }\n\n  /**\n   * Enqueues the given chunk `chunk` in the readable side of the controlled transform stream.\n   */\n  enqueue(chunk: O): void;\n  enqueue(chunk: O = undefined!): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('enqueue');\n    }\n\n    TransformStreamDefaultControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors both the readable side and the writable side of the controlled transform stream, making all future\n   * interactions with it fail with the given error `e`. Any chunks queued for transformation will be discarded.\n   */\n  error(reason: any = undefined): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n\n    TransformStreamDefaultControllerError(this, reason);\n  }\n\n  /**\n   * Closes the readable side and errors the writable side of the controlled transform stream. This is useful when the\n   * transformer only needs to consume a portion of the chunks written to the writable side.\n   */\n  terminate(): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('terminate');\n    }\n\n    TransformStreamDefaultControllerTerminate(this);\n  }\n}\n\nObject.defineProperties(TransformStreamDefaultController.prototype, {\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  terminate: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(TransformStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'TransformStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Transform Stream Default Controller Abstract Operations\n\nfunction IsTransformStreamDefaultController<O = any>(x: any): x is TransformStreamDefaultController<O> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledTransformStream')) {\n    return false;\n  }\n\n  return x instanceof TransformStreamDefaultController;\n}\n\nfunction SetUpTransformStreamDefaultController<I, O>(stream: TransformStream<I, O>,\n                                                     controller: TransformStreamDefaultController<O>,\n                                                     transformAlgorithm: (chunk: I) => Promise<void>,\n                                                     flushAlgorithm: () => Promise<void>) {\n  assert(IsTransformStream(stream));\n  assert(stream._transformStreamController === undefined);\n\n  controller._controlledTransformStream = stream;\n  stream._transformStreamController = controller;\n\n  controller._transformAlgorithm = transformAlgorithm;\n  controller._flushAlgorithm = flushAlgorithm;\n}\n\nfunction SetUpTransformStreamDefaultControllerFromTransformer<I, O>(stream: TransformStream<I, O>,\n                                                                    transformer: ValidatedTransformer<I, O>) {\n  const controller: TransformStreamDefaultController<O> = Object.create(TransformStreamDefaultController.prototype);\n\n  let transformAlgorithm = (chunk: I): Promise<void> => {\n    try {\n      TransformStreamDefaultControllerEnqueue(controller, chunk as unknown as O);\n      return promiseResolvedWith(undefined);\n    } catch (transformResultE) {\n      return promiseRejectedWith(transformResultE);\n    }\n  };\n\n  let flushAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (transformer.transform !== undefined) {\n    transformAlgorithm = chunk => transformer.transform!(chunk, controller);\n  }\n  if (transformer.flush !== undefined) {\n    flushAlgorithm = () => transformer.flush!(controller);\n  }\n\n  SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);\n}\n\nfunction TransformStreamDefaultControllerClearAlgorithms(controller: TransformStreamDefaultController<any>) {\n  controller._transformAlgorithm = undefined!;\n  controller._flushAlgorithm = undefined!;\n}\n\nfunction TransformStreamDefaultControllerEnqueue<O>(controller: TransformStreamDefaultController<O>, chunk: O) {\n  const stream = controller._controlledTransformStream;\n  const readableController = stream._readable._readableStreamController as ReadableStreamDefaultController<O>;\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(readableController)) {\n    throw new TypeError('Readable side is not in a state that permits enqueue');\n  }\n\n  // We throttle transform invocations based on the backpressure of the ReadableStream, but we still\n  // accept TransformStreamDefaultControllerEnqueue() calls.\n\n  try {\n    ReadableStreamDefaultControllerEnqueue(readableController, chunk);\n  } catch (e) {\n    // This happens when readableStrategy.size() throws.\n    TransformStreamErrorWritableAndUnblockWrite(stream, e);\n\n    throw stream._readable._storedError;\n  }\n\n  const backpressure = ReadableStreamDefaultControllerHasBackpressure(readableController);\n  if (backpressure !== stream._backpressure) {\n    assert(backpressure);\n    TransformStreamSetBackpressure(stream, true);\n  }\n}\n\nfunction TransformStreamDefaultControllerError(controller: TransformStreamDefaultController<any>, e: any) {\n  TransformStreamError(controller._controlledTransformStream, e);\n}\n\nfunction TransformStreamDefaultControllerPerformTransform<I, O>(controller: TransformStreamDefaultController<O>,\n                                                                chunk: I) {\n  const transformPromise = controller._transformAlgorithm(chunk);\n  return transformPromiseWith(transformPromise, undefined, r => {\n    TransformStreamError(controller._controlledTransformStream, r);\n    throw r;\n  });\n}\n\nfunction TransformStreamDefaultControllerTerminate<O>(controller: TransformStreamDefaultController<O>) {\n  const stream = controller._controlledTransformStream;\n  const readableController = stream._readable._readableStreamController as ReadableStreamDefaultController<O>;\n\n  ReadableStreamDefaultControllerClose(readableController);\n\n  const error = new TypeError('TransformStream terminated');\n  TransformStreamErrorWritableAndUnblockWrite(stream, error);\n}\n\n// TransformStreamDefaultSink Algorithms\n\nfunction TransformStreamDefaultSinkWriteAlgorithm<I, O>(stream: TransformStream<I, O>, chunk: I): Promise<void> {\n  assert(stream._writable._state === 'writable');\n\n  const controller = stream._transformStreamController;\n\n  if (stream._backpressure) {\n    const backpressureChangePromise = stream._backpressureChangePromise;\n    assert(backpressureChangePromise !== undefined);\n    return transformPromiseWith(backpressureChangePromise, () => {\n      const writable = stream._writable;\n      const state = writable._state;\n      if (state === 'erroring') {\n        throw writable._storedError;\n      }\n      assert(state === 'writable');\n      return TransformStreamDefaultControllerPerformTransform<I, O>(controller, chunk);\n    });\n  }\n\n  return TransformStreamDefaultControllerPerformTransform<I, O>(controller, chunk);\n}\n\nfunction TransformStreamDefaultSinkAbortAlgorithm(stream: TransformStream, reason: any): Promise<void> {\n  // abort() is not called synchronously, so it is possible for abort() to be called when the stream is already\n  // errored.\n  TransformStreamError(stream, reason);\n  return promiseResolvedWith(undefined);\n}\n\nfunction TransformStreamDefaultSinkCloseAlgorithm<I, O>(stream: TransformStream<I, O>): Promise<void> {\n  // stream._readable cannot change after construction, so caching it across a call to user code is safe.\n  const readable = stream._readable;\n\n  const controller = stream._transformStreamController;\n  const flushPromise = controller._flushAlgorithm();\n  TransformStreamDefaultControllerClearAlgorithms(controller);\n\n  // Return a promise that is fulfilled with undefined on success.\n  return transformPromiseWith(flushPromise, () => {\n    if (readable._state === 'errored') {\n      throw readable._storedError;\n    }\n    ReadableStreamDefaultControllerClose(readable._readableStreamController as ReadableStreamDefaultController<O>);\n  }, r => {\n    TransformStreamError(stream, r);\n    throw readable._storedError;\n  });\n}\n\n// TransformStreamDefaultSource Algorithms\n\nfunction TransformStreamDefaultSourcePullAlgorithm(stream: TransformStream): Promise<void> {\n  // Invariant. Enforced by the promises returned by start() and pull().\n  assert(stream._backpressure);\n\n  assert(stream._backpressureChangePromise !== undefined);\n\n  TransformStreamSetBackpressure(stream, false);\n\n  // Prevent the next pull() call until there is backpressure.\n  return stream._backpressureChangePromise;\n}\n\n// Helper functions for the TransformStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `TransformStreamDefaultController.prototype.${name} can only be used on a TransformStreamDefaultController`);\n}\n\n// Helper functions for the TransformStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `TransformStream.prototype.${name} can only be used on a TransformStream`);\n}\n","import {\n  ByteLengthQueuingStrategy,\n  CountQueuingStrategy,\n  ReadableByteStreamController,\n  ReadableStream,\n  ReadableStreamBYOBReader,\n  ReadableStreamBYOBRequest,\n  ReadableStreamDefaultController,\n  ReadableStreamDefaultReader,\n  TransformStream,\n  TransformStreamDefaultController,\n  WritableStream,\n  WritableStreamDefaultController,\n  WritableStreamDefaultWriter\n} from './ponyfill';\nimport { globals } from './utils';\n\n// Export\nexport * from './ponyfill';\n\nconst exports = {\n  ReadableStream,\n  ReadableStreamDefaultController,\n  ReadableByteStreamController,\n  ReadableStreamBYOBRequest,\n  ReadableStreamDefaultReader,\n  ReadableStreamBYOBReader,\n\n  WritableStream,\n  WritableStreamDefaultController,\n  WritableStreamDefaultWriter,\n\n  ByteLengthQueuingStrategy,\n  CountQueuingStrategy,\n\n  TransformStream,\n  TransformStreamDefaultController\n};\n\n// Add classes to global scope\nif (typeof globals !== 'undefined') {\n  for (const prop in exports) {\n    if (Object.prototype.hasOwnProperty.call(exports, prop)) {\n      Object.defineProperty(globals, prop, {\n        value: exports[prop as (keyof 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diff --git a/node_modules/web-streams-polyfill/dist/polyfill.es6.min.js b/node_modules/web-streams-polyfill/dist/polyfill.es6.min.js
new file mode 100644
index 0000000..c711d89
--- /dev/null
+++ b/node_modules/web-streams-polyfill/dist/polyfill.es6.min.js
@@ -0,0 +1,2 @@
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f(Z("read"));if(void 0===this._ownerReadableStream)return f(P("read from"));let e,t;const r=c(((r,o)=>{e=r,t=o}));return K(this,{_chunkSteps:t=>e({value:t,done:!1}),_closeSteps:()=>e({value:void 0,done:!0}),_errorSteps:e=>t(e)}),r}releaseLock(){if(!J(this))throw Z("releaseLock");if(void 0!==this._ownerReadableStream){if(this._readRequests.length>0)throw new TypeError("Tried to release a reader lock when that reader has pending read() calls un-settled");C(this)}}}function J(e){return!!n(e)&&(!!Object.prototype.hasOwnProperty.call(e,"_readRequests")&&e instanceof ReadableStreamDefaultReader)}function K(e,t){const r=e._ownerReadableStream;r._disturbed=!0,"closed"===r._state?t._closeSteps():"errored"===r._state?t._errorSteps(r._storedError):r._readableStreamController[A](t)}function Z(e){return new TypeError(`ReadableStreamDefaultReader.prototype.${e} can only be used on a ReadableStreamDefaultReader`)}let ee;Object.defineProperties(ReadableStreamDefaultReader.prototype,{cancel:{enumerable:!0},read:{enumerable:!0},releaseLock:{enumerable:!0},closed:{enumerable:!0}}),"symbol"==typeof t.toStringTag&&Object.defineProperty(ReadableStreamDefaultReader.prototype,t.toStringTag,{value:"ReadableStreamDefaultReader",configurable:!0}),"symbol"==typeof t.asyncIterator&&(ee={[t.asyncIterator](){return this}},Object.defineProperty(ee,t.asyncIterator,{enumerable:!1}));class te{constructor(e,t){this._ongoingPromise=void 0,this._isFinished=!1,this._reader=e,this._preventCancel=t}next(){const e=()=>this._nextSteps();return this._ongoingPromise=this._ongoingPromise?p(this._ongoingPromise,e,e):e(),this._ongoingPromise}return(e){const t=()=>this._returnSteps(e);return this._ongoingPromise?p(this._ongoingPromise,t,t):t()}_nextSteps(){if(this._isFinished)return Promise.resolve({value:void 0,done:!0});const e=this._reader;if(void 0===e._ownerReadableStream)return f(P("iterate"));let t,r;const o=c(((e,o)=>{t=e,r=o}));return K(e,{_chunkSteps:e=>{this._ongoingPromise=void 0,S((()=>t({value:e,done:!1})))},_closeSteps:()=>{this._ongoingPromise=void 0,this._isFinished=!0,C(e),t({value:void 0,done:!0})},_errorSteps:t=>{this._ongoingPromise=void 0,this._isFinished=!0,C(e),r(t)}}),o}_returnSteps(e){if(this._isFinished)return Promise.resolve({value:e,done:!0});this._isFinished=!0;const t=this._reader;if(void 0===t._ownerReadableStream)return f(P("finish iterating"));if(!this._preventCancel){const r=T(t,e);return C(t),p(r,(()=>({value:e,done:!0})))}return C(t),d({value:e,done:!0})}}const re={next(){return oe(this)?this._asyncIteratorImpl.next():f(ne("next"))},return(e){return oe(this)?this._asyncIteratorImpl.return(e):f(ne("return"))}};function oe(e){if(!n(e))return!1;if(!Object.prototype.hasOwnProperty.call(e,"_asyncIteratorImpl"))return!1;try{return e._asyncIteratorImpl instanceof te}catch(e){return!1}}function ne(e){return new TypeError(`ReadableStreamAsyncIterator.${e} can only be 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je(e,t){const r=e._pendingPullIntos.peek();if("closed"===e._controlledReadableByteStream._state){if(0!==t)throw new TypeError("bytesWritten must be 0 when calling respond() on a closed stream")}else{if(0===t)throw new TypeError("bytesWritten must be greater than 0 when calling respond() on a readable stream");if(r.bytesFilled+t>r.byteLength)throw new RangeError("bytesWritten out of range")}r.buffer=r.buffer,Ce(e,t)}function Ae(e,t){const r=e._pendingPullIntos.peek();if("closed"===e._controlledReadableByteStream._state){if(0!==t.byteLength)throw new TypeError("The view's length must be 0 when calling respondWithNewView() on a closed stream")}else if(0===t.byteLength)throw new TypeError("The view's length must be greater than 0 when calling respondWithNewView() on a readable stream");if(r.byteOffset+r.bytesFilled!==t.byteOffset)throw new RangeError("The region specified by view does not match byobRequest");if(r.bufferByteLength!==t.buffer.byteLength)throw new RangeError("The buffer of 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e._reader._readIntoRequests.length}function Me(e){const t=e._reader;return void 0!==t&&!!Qe(t)}Object.defineProperties(ReadableByteStreamController.prototype,{close:{enumerable:!0},enqueue:{enumerable:!0},error:{enumerable:!0},byobRequest:{enumerable:!0},desiredSize:{enumerable:!0}}),"symbol"==typeof t.toStringTag&&Object.defineProperty(ReadableByteStreamController.prototype,t.toStringTag,{value:"ReadableByteStreamController",configurable:!0});class ReadableStreamBYOBReader{constructor(e){if($(e,1,"ReadableStreamBYOBReader"),N(e,"First parameter"),fr(e))throw new TypeError("This stream has already been locked for exclusive reading by another reader");if(!be(e._readableStreamController))throw new TypeError("Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte source");R(this,e),this._readIntoRequests=new w}get closed(){return Qe(this)?this._closedPromise:f(xe("closed"))}cancel(e){return Qe(this)?void 0===this._ownerReadableStream?f(P("cancel")):T(this,e):f(xe("cancel"))}read(e){if(!Qe(this))return f(xe("read"));if(!ArrayBuffer.isView(e))return f(new TypeError("view must be an array buffer view"));if(0===e.byteLength)return f(new TypeError("view must have non-zero byteLength"));if(0===e.buffer.byteLength)return f(new TypeError("view's buffer must have non-zero byteLength"));if(e.buffer,void 0===this._ownerReadableStream)return f(P("read from"));let t,r;const o=c(((e,o)=>{t=e,r=o}));return Ye(this,e,{_chunkSteps:e=>t({value:e,done:!1}),_closeSteps:e=>t({value:e,done:!0}),_errorSteps:e=>r(e)}),o}releaseLock(){if(!Qe(this))throw xe("releaseLock");if(void 0!==this._ownerReadableStream){if(this._readIntoRequests.length>0)throw new TypeError("Tried to release a reader lock when that reader has pending read() calls un-settled");C(this)}}}function Qe(e){return!!n(e)&&(!!Object.prototype.hasOwnProperty.call(e,"_readIntoRequests")&&e instanceof ReadableStreamBYOBReader)}function Ye(e,t,r){const o=e._ownerReadableStream;o._disturbed=!0,"errored"===o._state?r._errorSteps(o._storedError):function(e,t,r){const o=e._controlledReadableByteStream;let n=1;t.constructor!==DataView&&(n=t.constructor.BYTES_PER_ELEMENT);const a=t.constructor,i=t.buffer,l={buffer:i,bufferByteLength:i.byteLength,byteOffset:t.byteOffset,byteLength:t.byteLength,bytesFilled:0,elementSize:n,viewConstructor:a,readerType:"byob"};if(e._pendingPullIntos.length>0)return e._pendingPullIntos.push(l),void Fe(o,r);if("closed"!==o._state){if(e._queueTotalSize>0){if(ge(e,l)){const t=ye(l);return we(e),void r._chunkSteps(t)}if(e._closeRequested){const t=new TypeError("Insufficient bytes to fill elements in the given buffer");return Oe(e,t),void r._errorSteps(t)}}e._pendingPullIntos.push(l),Fe(o,r),_e(e)}else{const e=new a(l.buffer,l.byteOffset,0);r._closeSteps(e)}}(o._readableStreamController,t,r)}function xe(e){return new TypeError(`ReadableStreamBYOBReader.prototype.${e} can only be used on a 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t.toStringTag&&Object.defineProperty(ReadableStreamBYOBReader.prototype,t.toStringTag,{value:"ReadableStreamBYOBReader",configurable:!0});const et="function"==typeof AbortController;class WritableStream{constructor(e={},t={}){void 0===e?e=null:F(e,"First parameter");const r=Ve(t,"Second parameter"),o=function(e,t){I(e,t);const r=null==e?void 0:e.abort,o=null==e?void 0:e.close,n=null==e?void 0:e.start,a=null==e?void 0:e.type,i=null==e?void 0:e.write;return{abort:void 0===r?void 0:Ge(r,e,`${t} has member 'abort' that`),close:void 0===o?void 0:Xe(o,e,`${t} has member 'close' that`),start:void 0===n?void 0:Je(n,e,`${t} has member 'start' that`),write:void 0===i?void 0:Ke(i,e,`${t} has member 'write' that`),type:a}}(e,"First parameter");rt(this);if(void 0!==o.type)throw new RangeError("Invalid type is specified");const n=He(r);!function(e,t,r,o){const n=Object.create(WritableStreamDefaultController.prototype);let a=()=>{},i=()=>d(void 0),l=()=>d(void 0),s=()=>d(void 0);void 0!==t.start&&(a=()=>t.start(n));void 0!==t.write&&(i=e=>t.write(e,n));void 0!==t.close&&(l=()=>t.close());void 0!==t.abort&&(s=e=>t.abort(e));vt(e,n,a,i,l,s,r,o)}(this,o,Ne(r,1),n)}get locked(){if(!ot(this))throw Et("locked");return nt(this)}abort(e){return ot(this)?nt(this)?f(new TypeError("Cannot abort a stream that already has a writer")):at(this,e):f(Et("abort"))}close(){return ot(this)?nt(this)?f(new TypeError("Cannot close a stream that already has a writer")):ct(this)?f(new TypeError("Cannot close an already-closing stream")):it(this):f(Et("close"))}getWriter(){if(!ot(this))throw Et("getWriter");return tt(this)}}function tt(e){return new WritableStreamDefaultWriter(e)}function rt(e){e._state="writable",e._storedError=void 0,e._writer=void 0,e._writableStreamController=void 0,e._writeRequests=new w,e._inFlightWriteRequest=void 0,e._closeRequest=void 0,e._inFlightCloseRequest=void 0,e._pendingAbortRequest=void 0,e._backpressure=!1}function ot(e){return!!n(e)&&(!!Object.prototype.hasOwnProperty.call(e,"_writableStreamController")&&e instanceof WritableStream)}function nt(e){return void 0!==e._writer}function at(e,t){var r;if("closed"===e._state||"errored"===e._state)return d(void 0);e._writableStreamController._abortReason=t,null===(r=e._writableStreamController._abortController)||void 0===r||r.abort();const o=e._state;if("closed"===o||"errored"===o)return d(void 0);if(void 0!==e._pendingAbortRequest)return e._pendingAbortRequest._promise;let n=!1;"erroring"===o&&(n=!0,t=void 0);const a=c(((r,o)=>{e._pendingAbortRequest={_promise:void 0,_resolve:r,_reject:o,_reason:t,_wasAlreadyErroring:n}}));return e._pendingAbortRequest._promise=a,n||st(e,t),a}function it(e){const t=e._state;if("closed"===t||"errored"===t)return f(new TypeError(`The stream (in ${t} state) is not in the writable state and cannot be closed`));const r=c(((t,r)=>{const o={_resolve:t,_reject:r};e._closeRequest=o})),o=e._writer;var n;return void 0!==o&&e._backpressure&&"writable"===t&&$t(o),de(n=e._writableStreamController,St,0),Tt(n),r}function lt(e,t){"writable"!==e._state?ut(e):st(e,t)}function st(e,t){const r=e._writableStreamController;e._state="erroring",e._storedError=t;const o=e._writer;void 0!==o&&mt(o,t),!function(e){if(void 0===e._inFlightWriteRequest&&void 0===e._inFlightCloseRequest)return!1;return!0}(e)&&r._started&&ut(e)}function ut(e){e._state="errored",e._writableStreamController[k]();const t=e._storedError;if(e._writeRequests.forEach((e=>{e._reject(t)})),e._writeRequests=new w,void 0===e._pendingAbortRequest)return void dt(e);const r=e._pendingAbortRequest;if(e._pendingAbortRequest=void 0,r._wasAlreadyErroring)return r._reject(t),void dt(e);h(e._writableStreamController[B](r._reason),(()=>{r._resolve(),dt(e)}),(t=>{r._reject(t),dt(e)}))}function ct(e){return void 0!==e._closeRequest||void 0!==e._inFlightCloseRequest}function dt(e){void 0!==e._closeRequest&&(e._closeRequest._reject(e._storedError),e._closeRequest=void 0);const t=e._writer;void 0!==t&&At(t,e._storedError)}function ft(e,t){const r=e._writer;void 0!==r&&t!==e._backpressure&&(t?function(e){Dt(e)}(r):$t(r)),e._backpressure=t}Object.defineProperties(WritableStream.prototype,{abort:{enumerable:!0},close:{enumerable:!0},getWriter:{enumerable:!0},locked:{enumerable:!0}}),"symbol"==typeof t.toStringTag&&Object.defineProperty(WritableStream.prototype,t.toStringTag,{value:"WritableStream",configurable:!0});class WritableStreamDefaultWriter{constructor(e){if($(e,1,"WritableStreamDefaultWriter"),Ze(e,"First parameter"),nt(e))throw new TypeError("This stream has already been locked for exclusive writing by another writer");this._ownerWritableStream=e,e._writer=this;const t=e._state;if("writable"===t)!ct(e)&&e._backpressure?Dt(this):Lt(this),kt(this);else if("erroring"===t)It(this,e._storedError),kt(this);else if("closed"===t)Lt(this),kt(r=this),zt(r);else{const t=e._storedError;It(this,t),jt(this,t)}var r}get closed(){return bt(this)?this._closedPromise:f(Ot("closed"))}get desiredSize(){if(!bt(this))throw Ot("desiredSize");if(void 0===this._ownerWritableStream)throw Bt("desiredSize");return function(e){const t=e._ownerWritableStream,r=t._state;if("errored"===r||"erroring"===r)return null;if("closed"===r)return 0;return Rt(t._writableStreamController)}(this)}get ready(){return bt(this)?this._readyPromise:f(Ot("ready"))}abort(e){return bt(this)?void 0===this._ownerWritableStream?f(Bt("abort")):function(e,t){return at(e._ownerWritableStream,t)}(this,e):f(Ot("abort"))}close(){if(!bt(this))return f(Ot("close"));const e=this._ownerWritableStream;return void 0===e?f(Bt("close")):ct(e)?f(new TypeError("Cannot close an already-closing stream")):ht(this)}releaseLock(){if(!bt(this))throw Ot("releaseLock");void 0!==this._ownerWritableStream&&pt(this)}write(e){return bt(this)?void 0===this._ownerWritableStream?f(Bt("write to")):yt(this,e):f(Ot("write"))}}function bt(e){return!!n(e)&&(!!Object.prototype.hasOwnProperty.call(e,"_ownerWritableStream")&&e instanceof WritableStreamDefaultWriter)}function ht(e){return it(e._ownerWritableStream)}function _t(e,t){"pending"===e._closedPromiseState?At(e,t):function(e,t){jt(e,t)}(e,t)}function mt(e,t){"pending"===e._readyPromiseState?Ft(e,t):function(e,t){It(e,t)}(e,t)}function pt(e){const t=e._ownerWritableStream,r=new TypeError("Writer was released and can no longer be used to monitor the stream's closedness");mt(e,r),_t(e,r),t._writer=void 0,e._ownerWritableStream=void 0}function yt(e,t){const r=e._ownerWritableStream,o=r._writableStreamController,n=function(e,t){try{return e._strategySizeAlgorithm(t)}catch(t){return Ct(e,t),1}}(o,t);if(r!==e._ownerWritableStream)return f(Bt("write to"));const a=r._state;if("errored"===a)return f(r._storedError);if(ct(r)||"closed"===a)return f(new TypeError("The stream is closing or closed and cannot be written to"));if("erroring"===a)return f(r._storedError);const i=function(e){return c(((t,r)=>{const o={_resolve:t,_reject:r};e._writeRequests.push(o)}))}(r);return function(e,t,r){try{de(e,t,r)}catch(t){return void Ct(e,t)}const o=e._controlledWritableStream;if(!ct(o)&&"writable"===o._state){ft(o,Pt(e))}Tt(e)}(o,t,n),i}Object.defineProperties(WritableStreamDefaultWriter.prototype,{abort:{enumerable:!0},close:{enumerable:!0},releaseLock:{enumerable:!0},write:{enumerable:!0},closed:{enumerable:!0},desiredSize:{enumerable:!0},ready:{enumerable:!0}}),"symbol"==typeof t.toStringTag&&Object.defineProperty(WritableStreamDefaultWriter.prototype,t.toStringTag,{value:"WritableStreamDefaultWriter",configurable:!0});const St={};class WritableStreamDefaultController{constructor(){throw new TypeError("Illegal constructor")}get abortReason(){if(!gt(this))throw Wt("abortReason");return this._abortReason}get signal(){if(!gt(this))throw Wt("signal");if(void 0===this._abortController)throw new TypeError("WritableStreamDefaultController.prototype.signal is not supported");return this._abortController.signal}error(e){if(!gt(this))throw Wt("error");"writable"===this._controlledWritableStream._state&&qt(this,e)}[B](e){const t=this._abortAlgorithm(e);return wt(this),t}[k](){fe(this)}}function gt(e){return!!n(e)&&(!!Object.prototype.hasOwnProperty.call(e,"_controlledWritableStream")&&e instanceof WritableStreamDefaultController)}function vt(e,t,r,o,n,a,i,l){t._controlledWritableStream=e,e._writableStreamController=t,t._queue=void 0,t._queueTotalSize=void 0,fe(t),t._abortReason=void 0,t._abortController=function(){if(et)return new AbortController}(),t._started=!1,t._strategySizeAlgorithm=l,t._strategyHWM=i,t._writeAlgorithm=o,t._closeAlgorithm=n,t._abortAlgorithm=a;const s=Pt(t);ft(e,s);h(d(r()),(()=>{t._started=!0,Tt(t)}),(r=>{t._started=!0,lt(e,r)}))}function wt(e){e._writeAlgorithm=void 0,e._closeAlgorithm=void 0,e._abortAlgorithm=void 0,e._strategySizeAlgorithm=void 0}function Rt(e){return e._strategyHWM-e._queueTotalSize}function Tt(e){const t=e._controlledWritableStream;if(!e._started)return;if(void 0!==t._inFlightWriteRequest)return;if("erroring"===t._state)return void ut(t);if(0===e._queue.length)return;const r=e._queue.peek().value;r===St?function(e){const t=e._controlledWritableStream;(function(e){e._inFlightCloseRequest=e._closeRequest,e._closeRequest=void 0})(t),ce(e);const r=e._closeAlgorithm();wt(e),h(r,(()=>{!function(e){e._inFlightCloseRequest._resolve(void 0),e._inFlightCloseRequest=void 0,"erroring"===e._state&&(e._storedError=void 0,void 0!==e._pendingAbortRequest&&(e._pendingAbortRequest._resolve(),e._pendingAbortRequest=void 0)),e._state="closed";const t=e._writer;void 0!==t&&zt(t)}(t)}),(e=>{!function(e,t){e._inFlightCloseRequest._reject(t),e._inFlightCloseRequest=void 0,void 0!==e._pendingAbortRequest&&(e._pendingAbortRequest._reject(t),e._pendingAbortRequest=void 0),lt(e,t)}(t,e)}))}(e):function(e,t){const r=e._controlledWritableStream;!function(e){e._inFlightWriteRequest=e._writeRequests.shift()}(r);h(e._writeAlgorithm(t),(()=>{!function(e){e._inFlightWriteRequest._resolve(void 0),e._inFlightWriteRequest=void 0}(r);const t=r._state;if(ce(e),!ct(r)&&"writable"===t){const t=Pt(e);ft(r,t)}Tt(e)}),(t=>{"writable"===r._state&&wt(e),function(e,t){e._inFlightWriteRequest._reject(t),e._inFlightWriteRequest=void 0,lt(e,t)}(r,t)}))}(e,r)}function Ct(e,t){"writable"===e._controlledWritableStream._state&&qt(e,t)}function Pt(e){return Rt(e)<=0}function qt(e,t){const r=e._controlledWritableStream;wt(e),st(r,t)}function Et(e){return new TypeError(`WritableStream.prototype.${e} can only be used on a WritableStream`)}function Wt(e){return new TypeError(`WritableStreamDefaultController.prototype.${e} can only be used on a WritableStreamDefaultController`)}function Ot(e){return new TypeError(`WritableStreamDefaultWriter.prototype.${e} can only be used on a WritableStreamDefaultWriter`)}function Bt(e){return new TypeError("Cannot "+e+" a stream using a released writer")}function kt(e){e._closedPromise=c(((t,r)=>{e._closedPromise_resolve=t,e._closedPromise_reject=r,e._closedPromiseState="pending"}))}function jt(e,t){kt(e),At(e,t)}function At(e,t){void 0!==e._closedPromise_reject&&(y(e._closedPromise),e._closedPromise_reject(t),e._closedPromise_resolve=void 0,e._closedPromise_reject=void 0,e._closedPromiseState="rejected")}function zt(e){void 0!==e._closedPromise_resolve&&(e._closedPromise_resolve(void 0),e._closedPromise_resolve=void 0,e._closedPromise_reject=void 0,e._closedPromiseState="resolved")}function Dt(e){e._readyPromise=c(((t,r)=>{e._readyPromise_resolve=t,e._readyPromise_reject=r})),e._readyPromiseState="pending"}function It(e,t){Dt(e),Ft(e,t)}function Lt(e){Dt(e),$t(e)}function Ft(e,t){void 0!==e._readyPromise_reject&&(y(e._readyPromise),e._readyPromise_reject(t),e._readyPromise_resolve=void 0,e._readyPromise_reject=void 0,e._readyPromiseState="rejected")}function $t(e){void 0!==e._readyPromise_resolve&&(e._readyPromise_resolve(void 0),e._readyPromise_resolve=void 0,e._readyPromise_reject=void 0,e._readyPromiseState="fulfilled")}Object.defineProperties(WritableStreamDefaultController.prototype,{abortReason:{enumerable:!0},signal:{enumerable:!0},error:{enumerable:!0}}),"symbol"==typeof t.toStringTag&&Object.defineProperty(WritableStreamDefaultController.prototype,t.toStringTag,{value:"WritableStreamDefaultController",configurable:!0});const Mt="undefined"!=typeof DOMException?DOMException:void 0;const Qt=function(e){if("function"!=typeof e&&"object"!=typeof e)return!1;try{return new e,!0}catch(e){return!1}}(Mt)?Mt:function(){const e=function(e,t){this.message=e||"",this.name=t||"Error",Error.captureStackTrace&&Error.captureStackTrace(this,this.constructor)};return e.prototype=Object.create(Error.prototype),Object.defineProperty(e.prototype,"constructor",{value:e,writable:!0,configurable:!0}),e}();function Yt(e,t,o,n,a,i){const l=H(e),s=tt(t);e._disturbed=!0;let u=!1,p=d(void 0);return c(((S,g)=>{let v;if(void 0!==i){if(v=()=>{const r=new Qt("Aborted","AbortError"),o=[];n||o.push((()=>"writable"===t._state?at(t,r):d(void 0))),a||o.push((()=>"readable"===e._state?br(e,r):d(void 0))),E((()=>Promise.all(o.map((e=>e())))),!0,r)},i.aborted)return void v();i.addEventListener("abort",v)}var w,R,T;if(q(e,l._closedPromise,(e=>{n?W(!0,e):E((()=>at(t,e)),!0,e)})),q(t,s._closedPromise,(t=>{a?W(!0,t):E((()=>br(e,t)),!0,t)})),w=e,R=l._closedPromise,T=()=>{o?W():E((()=>function(e){const t=e._ownerWritableStream,r=t._state;return ct(t)||"closed"===r?d(void 0):"errored"===r?f(t._storedError):ht(e)}(s)))},"closed"===w._state?T():_(R,T),ct(t)||"closed"===t._state){const t=new TypeError("the destination writable stream closed before all data could be piped to it");a?W(!0,t):E((()=>br(e,t)),!0,t)}function P(){const e=p;return b(p,(()=>e!==p?P():void 0))}function q(e,t,r){"errored"===e._state?r(e._storedError):m(t,r)}function E(e,r,o){function n(){h(e(),(()=>O(r,o)),(e=>O(!0,e)))}u||(u=!0,"writable"!==t._state||ct(t)?n():_(P(),n))}function W(e,r){u||(u=!0,"writable"!==t._state||ct(t)?O(e,r):_(P(),(()=>O(e,r))))}function O(e,t){pt(s),C(l),void 0!==i&&i.removeEventListener("abort",v),e?g(t):S(void 0)}y(c(((e,t)=>{!function o(n){n?e():b(u?d(!0):b(s._readyPromise,(()=>c(((e,t)=>{K(l,{_chunkSteps:t=>{p=b(yt(s,t),void 0,r),e(!1)},_closeSteps:()=>e(!0),_errorSteps:t})})))),o,t)}(!1)})))}))}class ReadableStreamDefaultController{constructor(){throw new TypeError("Illegal constructor")}get desiredSize(){if(!xt(this))throw er("desiredSize");return Jt(this)}close(){if(!xt(this))throw er("close");if(!Kt(this))throw new TypeError("The stream is not in a state that permits close");Ut(this)}enqueue(e){if(!xt(this))throw er("enqueue");if(!Kt(this))throw new TypeError("The stream is not in a state that permits enqueue");return Gt(this,e)}error(e){if(!xt(this))throw er("error");Xt(this,e)}[j](e){fe(this);const t=this._cancelAlgorithm(e);return Vt(this),t}[A](e){const t=this._controlledReadableStream;if(this._queue.length>0){const r=ce(this);this._closeRequested&&0===this._queue.length?(Vt(this),hr(t)):Nt(this),e._chunkSteps(r)}else V(t,e),Nt(this)}}function xt(e){return!!n(e)&&(!!Object.prototype.hasOwnProperty.call(e,"_controlledReadableStream")&&e instanceof ReadableStreamDefaultController)}function Nt(e){if(!Ht(e))return;if(e._pulling)return void(e._pullAgain=!0);e._pulling=!0;h(e._pullAlgorithm(),(()=>{e._pulling=!1,e._pullAgain&&(e._pullAgain=!1,Nt(e))}),(t=>{Xt(e,t)}))}function Ht(e){const t=e._controlledReadableStream;if(!Kt(e))return!1;if(!e._started)return!1;if(fr(t)&&G(t)>0)return!0;return Jt(e)>0}function Vt(e){e._pullAlgorithm=void 0,e._cancelAlgorithm=void 0,e._strategySizeAlgorithm=void 0}function Ut(e){if(!Kt(e))return;const t=e._controlledReadableStream;e._closeRequested=!0,0===e._queue.length&&(Vt(e),hr(t))}function Gt(e,t){if(!Kt(e))return;const r=e._controlledReadableStream;if(fr(r)&&G(r)>0)U(r,t,!1);else{let r;try{r=e._strategySizeAlgorithm(t)}catch(t){throw Xt(e,t),t}try{de(e,t,r)}catch(t){throw Xt(e,t),t}}Nt(e)}function Xt(e,t){const r=e._controlledReadableStream;"readable"===r._state&&(fe(e),Vt(e),_r(r,t))}function Jt(e){const t=e._controlledReadableStream._state;return"errored"===t?null:"closed"===t?0:e._strategyHWM-e._queueTotalSize}function Kt(e){const t=e._controlledReadableStream._state;return!e._closeRequested&&"readable"===t}function Zt(e,t,r,o,n,a,i){t._controlledReadableStream=e,t._queue=void 0,t._queueTotalSize=void 0,fe(t),t._started=!1,t._closeRequested=!1,t._pullAgain=!1,t._pulling=!1,t._strategySizeAlgorithm=i,t._strategyHWM=a,t._pullAlgorithm=o,t._cancelAlgorithm=n,e._readableStreamController=t;h(d(r()),(()=>{t._started=!0,Nt(t)}),(e=>{Xt(t,e)}))}function er(e){return new TypeError(`ReadableStreamDefaultController.prototype.${e} can only be used on a ReadableStreamDefaultController`)}function tr(e,t){return be(e._readableStreamController)?function(e){let t,r,o,n,a,i=H(e),l=!1,s=!1,u=!1,f=!1,b=!1;const h=c((e=>{a=e}));function _(e){m(e._closedPromise,(t=>{e===i&&(Oe(o._readableStreamController,t),Oe(n._readableStreamController,t),f&&b||a(void 0))}))}function p(){Qe(i)&&(C(i),i=H(e),_(i));K(i,{_chunkSteps:t=>{S((()=>{s=!1,u=!1;const r=t;let i=t;if(!f&&!b)try{i=ue(t)}catch(t){return Oe(o._readableStreamController,t),Oe(n._readableStreamController,t),void a(br(e,t))}f||We(o._readableStreamController,r),b||We(n._readableStreamController,i),l=!1,s?g():u&&v()}))},_closeSteps:()=>{l=!1,f||Ee(o._readableStreamController),b||Ee(n._readableStreamController),o._readableStreamController._pendingPullIntos.length>0&&je(o._readableStreamController,0),n._readableStreamController._pendingPullIntos.length>0&&je(n._readableStreamController,0),f&&b||a(void 0)},_errorSteps:()=>{l=!1}})}function y(t,r){J(i)&&(C(i),i=Le(e),_(i));const c=r?n:o,d=r?o:n;Ye(i,t,{_chunkSteps:t=>{S((()=>{s=!1,u=!1;const o=r?b:f;if(r?f:b)o||Ae(c._readableStreamController,t);else{let r;try{r=ue(t)}catch(t){return Oe(c._readableStreamController,t),Oe(d._readableStreamController,t),void a(br(e,t))}o||Ae(c._readableStreamController,t),We(d._readableStreamController,r)}l=!1,s?g():u&&v()}))},_closeSteps:e=>{l=!1;const t=r?b:f,o=r?f:b;t||Ee(c._readableStreamController),o||Ee(d._readableStreamController),void 0!==e&&(t||Ae(c._readableStreamController,e),!o&&d._readableStreamController._pendingPullIntos.length>0&&je(d._readableStreamController,0)),t&&o||a(void 0)},_errorSteps:()=>{l=!1}})}function g(){if(l)return s=!0,d(void 0);l=!0;const e=Be(o._readableStreamController);return null===e?p():y(e._view,!1),d(void 0)}function v(){if(l)return u=!0,d(void 0);l=!0;const e=Be(n._readableStreamController);return null===e?p():y(e._view,!0),d(void 0)}function w(o){if(f=!0,t=o,b){const o=ie([t,r]),n=br(e,o);a(n)}return h}function R(o){if(b=!0,r=o,f){const o=ie([t,r]),n=br(e,o);a(n)}return h}function T(){}return o=ur(T,g,w),n=ur(T,v,R),_(i),[o,n]}(e):function(e,t){const r=H(e);let o,n,a,i,l,s=!1,u=!1,f=!1,b=!1;const h=c((e=>{l=e}));function _(){if(s)return u=!0,d(void 0);s=!0;return K(r,{_chunkSteps:e=>{S((()=>{u=!1;const t=e,r=e;f||Gt(a._readableStreamController,t),b||Gt(i._readableStreamController,r),s=!1,u&&_()}))},_closeSteps:()=>{s=!1,f||Ut(a._readableStreamController),b||Ut(i._readableStreamController),f&&b||l(void 0)},_errorSteps:()=>{s=!1}}),d(void 0)}function p(t){if(f=!0,o=t,b){const t=ie([o,n]),r=br(e,t);l(r)}return h}function y(t){if(b=!0,n=t,f){const t=ie([o,n]),r=br(e,t);l(r)}return h}function g(){}return a=sr(g,_,p),i=sr(g,_,y),m(r._closedPromise,(e=>{Xt(a._readableStreamController,e),Xt(i._readableStreamController,e),f&&b||l(void 0)})),[a,i]}(e)}function rr(e,t,r){return L(e,r),r=>v(e,t,[r])}function or(e,t,r){return L(e,r),r=>v(e,t,[r])}function nr(e,t,r){return L(e,r),r=>g(e,t,[r])}function ar(e,t){if("bytes"!==(e=`${e}`))throw new TypeError(`${t} '${e}' is not a valid enumeration value for ReadableStreamType`);return e}function ir(e,t){if("byob"!==(e=`${e}`))throw new TypeError(`${t} '${e}' is not a valid enumeration value for ReadableStreamReaderMode`);return e}function lr(e,t){I(e,t);const r=null==e?void 0:e.preventAbort,o=null==e?void 0:e.preventCancel,n=null==e?void 0:e.preventClose,a=null==e?void 0:e.signal;return void 0!==a&&function(e,t){if(!function(e){if("object"!=typeof e||null===e)return!1;try{return"boolean"==typeof e.aborted}catch(e){return!1}}(e))throw new TypeError(`${t} is not an AbortSignal.`)}(a,`${t} has member 'signal' that`),{preventAbort:Boolean(r),preventCancel:Boolean(o),preventClose:Boolean(n),signal:a}}Object.defineProperties(ReadableStreamDefaultController.prototype,{close:{enumerable:!0},enqueue:{enumerable:!0},error:{enumerable:!0},desiredSize:{enumerable:!0}}),"symbol"==typeof t.toStringTag&&Object.defineProperty(ReadableStreamDefaultController.prototype,t.toStringTag,{value:"ReadableStreamDefaultController",configurable:!0});class ReadableStream{constructor(e={},t={}){void 0===e?e=null:F(e,"First parameter");const r=Ve(t,"Second parameter"),o=function(e,t){I(e,t);const r=e,o=null==r?void 0:r.autoAllocateChunkSize,n=null==r?void 0:r.cancel,a=null==r?void 0:r.pull,i=null==r?void 0:r.start,l=null==r?void 0:r.type;return{autoAllocateChunkSize:void 0===o?void 0:x(o,`${t} has member 'autoAllocateChunkSize' that`),cancel:void 0===n?void 0:rr(n,r,`${t} has member 'cancel' that`),pull:void 0===a?void 0:or(a,r,`${t} has member 'pull' that`),start:void 0===i?void 0:nr(i,r,`${t} has member 'start' that`),type:void 0===l?void 0:ar(l,`${t} has member 'type' that`)}}(e,"First parameter");if(cr(this),"bytes"===o.type){if(void 0!==r.size)throw new RangeError("The strategy for a byte stream cannot have a size function");!function(e,t,r){const o=Object.create(ReadableByteStreamController.prototype);let n=()=>{},a=()=>d(void 0),i=()=>d(void 0);void 0!==t.start&&(n=()=>t.start(o)),void 0!==t.pull&&(a=()=>t.pull(o)),void 0!==t.cancel&&(i=e=>t.cancel(e));const l=t.autoAllocateChunkSize;if(0===l)throw new TypeError("autoAllocateChunkSize must be greater than 0");ze(e,o,n,a,i,r,l)}(this,o,Ne(r,0))}else{const e=He(r);!function(e,t,r,o){const n=Object.create(ReadableStreamDefaultController.prototype);let a=()=>{},i=()=>d(void 0),l=()=>d(void 0);void 0!==t.start&&(a=()=>t.start(n)),void 0!==t.pull&&(i=()=>t.pull(n)),void 0!==t.cancel&&(l=e=>t.cancel(e)),Zt(e,n,a,i,l,r,o)}(this,o,Ne(r,1),e)}}get locked(){if(!dr(this))throw mr("locked");return fr(this)}cancel(e){return dr(this)?fr(this)?f(new TypeError("Cannot cancel a stream that already has a reader")):br(this,e):f(mr("cancel"))}getReader(e){if(!dr(this))throw mr("getReader");return void 0===function(e,t){I(e,t);const r=null==e?void 0:e.mode;return{mode:void 0===r?void 0:ir(r,`${t} has member 'mode' that`)}}(e,"First parameter").mode?H(this):Le(this)}pipeThrough(e,t={}){if(!dr(this))throw mr("pipeThrough");$(e,1,"pipeThrough");const r=function(e,t){I(e,t);const r=null==e?void 0:e.readable;M(r,"readable","ReadableWritablePair"),N(r,`${t} has member 'readable' that`);const o=null==e?void 0:e.writable;return M(o,"writable","ReadableWritablePair"),Ze(o,`${t} has member 'writable' that`),{readable:r,writable:o}}(e,"First parameter"),o=lr(t,"Second parameter");if(fr(this))throw new TypeError("ReadableStream.prototype.pipeThrough cannot be used on a locked ReadableStream");if(nt(r.writable))throw new TypeError("ReadableStream.prototype.pipeThrough cannot be used on a locked WritableStream");return y(Yt(this,r.writable,o.preventClose,o.preventAbort,o.preventCancel,o.signal)),r.readable}pipeTo(e,t={}){if(!dr(this))return f(mr("pipeTo"));if(void 0===e)return f("Parameter 1 is required in 'pipeTo'.");if(!ot(e))return f(new TypeError("ReadableStream.prototype.pipeTo's first argument must be a WritableStream"));let r;try{r=lr(t,"Second parameter")}catch(e){return f(e)}return fr(this)?f(new TypeError("ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream")):nt(e)?f(new TypeError("ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream")):Yt(this,e,r.preventClose,r.preventAbort,r.preventCancel,r.signal)}tee(){if(!dr(this))throw mr("tee");return ie(tr(this))}values(e){if(!dr(this))throw mr("values");return function(e,t){const r=H(e),o=new te(r,t),n=Object.create(re);return n._asyncIteratorImpl=o,n}(this,function(e,t){I(e,t);const r=null==e?void 0:e.preventCancel;return{preventCancel:Boolean(r)}}(e,"First parameter").preventCancel)}}function sr(e,t,r,o=1,n=(()=>1)){const a=Object.create(ReadableStream.prototype);cr(a);return Zt(a,Object.create(ReadableStreamDefaultController.prototype),e,t,r,o,n),a}function ur(e,t,r){const o=Object.create(ReadableStream.prototype);cr(o);return ze(o,Object.create(ReadableByteStreamController.prototype),e,t,r,0,void 0),o}function cr(e){e._state="readable",e._reader=void 0,e._storedError=void 0,e._disturbed=!1}function dr(e){return!!n(e)&&(!!Object.prototype.hasOwnProperty.call(e,"_readableStreamController")&&e instanceof ReadableStream)}function fr(e){return void 0!==e._reader}function br(e,t){if(e._disturbed=!0,"closed"===e._state)return d(void 0);if("errored"===e._state)return f(e._storedError);hr(e);const o=e._reader;void 0!==o&&Qe(o)&&(o._readIntoRequests.forEach((e=>{e._closeSteps(void 0)})),o._readIntoRequests=new w);return p(e._readableStreamController[j](t),r)}function hr(e){e._state="closed";const t=e._reader;void 0!==t&&(O(t),J(t)&&(t._readRequests.forEach((e=>{e._closeSteps()})),t._readRequests=new w))}function _r(e,t){e._state="errored",e._storedError=t;const r=e._reader;void 0!==r&&(W(r,t),J(r)?(r._readRequests.forEach((e=>{e._errorSteps(t)})),r._readRequests=new w):(r._readIntoRequests.forEach((e=>{e._errorSteps(t)})),r._readIntoRequests=new w))}function mr(e){return new TypeError(`ReadableStream.prototype.${e} can only be used on a ReadableStream`)}function pr(e,t){I(e,t);const r=null==e?void 0:e.highWaterMark;return M(r,"highWaterMark","QueuingStrategyInit"),{highWaterMark:Q(r)}}Object.defineProperties(ReadableStream.prototype,{cancel:{enumerable:!0},getReader:{enumerable:!0},pipeThrough:{enumerable:!0},pipeTo:{enumerable:!0},tee:{enumerable:!0},values:{enumerable:!0},locked:{enumerable:!0}}),"symbol"==typeof t.toStringTag&&Object.defineProperty(ReadableStream.prototype,t.toStringTag,{value:"ReadableStream",configurable:!0}),"symbol"==typeof t.asyncIterator&&Object.defineProperty(ReadableStream.prototype,t.asyncIterator,{value:ReadableStream.prototype.values,writable:!0,configurable:!0});const yr=e=>e.byteLength;try{Object.defineProperty(yr,"name",{value:"size",configurable:!0})}catch(e){}class ByteLengthQueuingStrategy{constructor(e){$(e,1,"ByteLengthQueuingStrategy"),e=pr(e,"First parameter"),this._byteLengthQueuingStrategyHighWaterMark=e.highWaterMark}get highWaterMark(){if(!gr(this))throw Sr("highWaterMark");return this._byteLengthQueuingStrategyHighWaterMark}get size(){if(!gr(this))throw Sr("size");return yr}}function Sr(e){return new TypeError(`ByteLengthQueuingStrategy.prototype.${e} can only be used on a ByteLengthQueuingStrategy`)}function gr(e){return!!n(e)&&(!!Object.prototype.hasOwnProperty.call(e,"_byteLengthQueuingStrategyHighWaterMark")&&e instanceof ByteLengthQueuingStrategy)}Object.defineProperties(ByteLengthQueuingStrategy.prototype,{highWaterMark:{enumerable:!0},size:{enumerable:!0}}),"symbol"==typeof t.toStringTag&&Object.defineProperty(ByteLengthQueuingStrategy.prototype,t.toStringTag,{value:"ByteLengthQueuingStrategy",configurable:!0});const vr=()=>1;try{Object.defineProperty(vr,"name",{value:"size",configurable:!0})}catch(e){}class CountQueuingStrategy{constructor(e){$(e,1,"CountQueuingStrategy"),e=pr(e,"First parameter"),this._countQueuingStrategyHighWaterMark=e.highWaterMark}get highWaterMark(){if(!Rr(this))throw wr("highWaterMark");return this._countQueuingStrategyHighWaterMark}get size(){if(!Rr(this))throw wr("size");return vr}}function wr(e){return new TypeError(`CountQueuingStrategy.prototype.${e} can only be used on a CountQueuingStrategy`)}function Rr(e){return!!n(e)&&(!!Object.prototype.hasOwnProperty.call(e,"_countQueuingStrategyHighWaterMark")&&e instanceof CountQueuingStrategy)}function Tr(e,t,r){return L(e,r),r=>v(e,t,[r])}function Cr(e,t,r){return L(e,r),r=>g(e,t,[r])}function Pr(e,t,r){return L(e,r),(r,o)=>v(e,t,[r,o])}Object.defineProperties(CountQueuingStrategy.prototype,{highWaterMark:{enumerable:!0},size:{enumerable:!0}}),"symbol"==typeof t.toStringTag&&Object.defineProperty(CountQueuingStrategy.prototype,t.toStringTag,{value:"CountQueuingStrategy",configurable:!0});class TransformStream{constructor(e={},t={},r={}){void 0===e&&(e=null);const o=Ve(t,"Second parameter"),n=Ve(r,"Third parameter"),a=function(e,t){I(e,t);const r=null==e?void 0:e.flush,o=null==e?void 0:e.readableType,n=null==e?void 0:e.start,a=null==e?void 0:e.transform,i=null==e?void 0:e.writableType;return{flush:void 0===r?void 0:Tr(r,e,`${t} has member 'flush' that`),readableType:o,start:void 0===n?void 0:Cr(n,e,`${t} has member 'start' that`),transform:void 0===a?void 0:Pr(a,e,`${t} has member 'transform' that`),writableType:i}}(e,"First parameter");if(void 0!==a.readableType)throw new RangeError("Invalid readableType specified");if(void 0!==a.writableType)throw new RangeError("Invalid writableType specified");const i=Ne(n,0),l=He(n),s=Ne(o,1),u=He(o);let b;!function(e,t,r,o,n,a){function i(){return t}function l(t){return function(e,t){const r=e._transformStreamController;if(e._backpressure){return p(e._backpressureChangePromise,(()=>{const o=e._writable;if("erroring"===o._state)throw o._storedError;return Ar(r,t)}))}return Ar(r,t)}(e,t)}function s(t){return function(e,t){return Er(e,t),d(void 0)}(e,t)}function u(){return function(e){const t=e._readable,r=e._transformStreamController,o=r._flushAlgorithm();return kr(r),p(o,(()=>{if("errored"===t._state)throw t._storedError;Ut(t._readableStreamController)}),(r=>{throw Er(e,r),t._storedError}))}(e)}function c(){return function(e){return Or(e,!1),e._backpressureChangePromise}(e)}function f(t){return Wr(e,t),d(void 0)}e._writable=function(e,t,r,o,n=1,a=(()=>1)){const i=Object.create(WritableStream.prototype);return rt(i),vt(i,Object.create(WritableStreamDefaultController.prototype),e,t,r,o,n,a),i}(i,l,u,s,r,o),e._readable=sr(i,c,f,n,a),e._backpressure=void 0,e._backpressureChangePromise=void 0,e._backpressureChangePromise_resolve=void 0,Or(e,!0),e._transformStreamController=void 0}(this,c((e=>{b=e})),s,u,i,l),function(e,t){const r=Object.create(TransformStreamDefaultController.prototype);let o=e=>{try{return jr(r,e),d(void 0)}catch(e){return f(e)}},n=()=>d(void 0);void 0!==t.transform&&(o=e=>t.transform(e,r));void 0!==t.flush&&(n=()=>t.flush(r));!function(e,t,r,o){t._controlledTransformStream=e,e._transformStreamController=t,t._transformAlgorithm=r,t._flushAlgorithm=o}(e,r,o,n)}(this,a),void 0!==a.start?b(a.start(this._transformStreamController)):b(void 0)}get readable(){if(!qr(this))throw Dr("readable");return this._readable}get writable(){if(!qr(this))throw Dr("writable");return this._writable}}function qr(e){return!!n(e)&&(!!Object.prototype.hasOwnProperty.call(e,"_transformStreamController")&&e instanceof TransformStream)}function Er(e,t){Xt(e._readable._readableStreamController,t),Wr(e,t)}function Wr(e,t){kr(e._transformStreamController),Ct(e._writable._writableStreamController,t),e._backpressure&&Or(e,!1)}function Or(e,t){void 0!==e._backpressureChangePromise&&e._backpressureChangePromise_resolve(),e._backpressureChangePromise=c((t=>{e._backpressureChangePromise_resolve=t})),e._backpressure=t}Object.defineProperties(TransformStream.prototype,{readable:{enumerable:!0},writable:{enumerable:!0}}),"symbol"==typeof t.toStringTag&&Object.defineProperty(TransformStream.prototype,t.toStringTag,{value:"TransformStream",configurable:!0});class TransformStreamDefaultController{constructor(){throw new TypeError("Illegal constructor")}get desiredSize(){if(!Br(this))throw zr("desiredSize");return Jt(this._controlledTransformStream._readable._readableStreamController)}enqueue(e){if(!Br(this))throw zr("enqueue");jr(this,e)}error(e){if(!Br(this))throw zr("error");var t;t=e,Er(this._controlledTransformStream,t)}terminate(){if(!Br(this))throw zr("terminate");!function(e){const t=e._controlledTransformStream;Ut(t._readable._readableStreamController);const r=new TypeError("TransformStream terminated");Wr(t,r)}(this)}}function Br(e){return!!n(e)&&(!!Object.prototype.hasOwnProperty.call(e,"_controlledTransformStream")&&e instanceof TransformStreamDefaultController)}function kr(e){e._transformAlgorithm=void 0,e._flushAlgorithm=void 0}function jr(e,t){const r=e._controlledTransformStream,o=r._readable._readableStreamController;if(!Kt(o))throw new TypeError("Readable side is not in a state that permits enqueue");try{Gt(o,t)}catch(e){throw Wr(r,e),r._readable._storedError}(function(e){return!Ht(e)})(o)!==r._backpressure&&Or(r,!0)}function Ar(e,t){return p(e._transformAlgorithm(t),void 0,(t=>{throw Er(e._controlledTransformStream,t),t}))}function zr(e){return new TypeError(`TransformStreamDefaultController.prototype.${e} can only be used on a TransformStreamDefaultController`)}function Dr(e){return new TypeError(`TransformStream.prototype.${e} can only be used on a TransformStream`)}Object.defineProperties(TransformStreamDefaultController.prototype,{enqueue:{enumerable:!0},error:{enumerable:!0},terminate:{enumerable:!0},desiredSize:{enumerable:!0}}),"symbol"==typeof t.toStringTag&&Object.defineProperty(TransformStreamDefaultController.prototype,t.toStringTag,{value:"TransformStreamDefaultController",configurable:!0});const Ir={ReadableStream:ReadableStream,ReadableStreamDefaultController:ReadableStreamDefaultController,ReadableByteStreamController:ReadableByteStreamController,ReadableStreamBYOBRequest:ReadableStreamBYOBRequest,ReadableStreamDefaultReader:ReadableStreamDefaultReader,ReadableStreamBYOBReader:ReadableStreamBYOBReader,WritableStream:WritableStream,WritableStreamDefaultController:WritableStreamDefaultController,WritableStreamDefaultWriter:WritableStreamDefaultWriter,ByteLengthQueuingStrategy:ByteLengthQueuingStrategy,CountQueuingStrategy:CountQueuingStrategy,TransformStream:TransformStream,TransformStreamDefaultController:TransformStreamDefaultController};if(void 0!==o)for(const e in Ir)Object.prototype.hasOwnProperty.call(Ir,e)&&Object.defineProperty(o,e,{value:Ir[e],writable:!0,configurable:!0});e.ByteLengthQueuingStrategy=ByteLengthQueuingStrategy,e.CountQueuingStrategy=CountQueuingStrategy,e.ReadableByteStreamController=ReadableByteStreamController,e.ReadableStream=ReadableStream,e.ReadableStreamBYOBReader=ReadableStreamBYOBReader,e.ReadableStreamBYOBRequest=ReadableStreamBYOBRequest,e.ReadableStreamDefaultController=ReadableStreamDefaultController,e.ReadableStreamDefaultReader=ReadableStreamDefaultReader,e.TransformStream=TransformStream,e.TransformStreamDefaultController=TransformStreamDefaultController,e.WritableStream=WritableStream,e.WritableStreamDefaultController=WritableStreamDefaultController,e.WritableStreamDefaultWriter=WritableStreamDefaultWriter,Object.defineProperty(e,"__esModule",{value:!0})}));
+//# sourceMappingURL=polyfill.es6.min.js.map
diff --git a/node_modules/web-streams-polyfill/dist/polyfill.es6.min.js.map b/node_modules/web-streams-polyfill/dist/polyfill.es6.min.js.map
new file mode 100644
index 0000000..33c6f9c
--- /dev/null
+++ b/node_modules/web-streams-polyfill/dist/polyfill.es6.min.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"polyfill.es6.min.js","sources":["../src/stub/symbol.ts","../src/utils.ts","../src/lib/helpers/miscellaneous.ts","../src/lib/helpers/webidl.ts","../src/lib/simple-queue.ts","../src/lib/readable-stream/generic-reader.ts","../src/lib/abstract-ops/internal-methods.ts","../src/stub/number-isfinite.ts","../src/stub/math-trunc.ts","../src/lib/validators/basic.ts","../src/lib/validators/readable-stream.ts","../src/lib/readable-stream/default-reader.ts","../src/target/es5/stub/async-iterator-prototype.ts","../src/lib/readable-stream/async-iterator.ts","../src/stub/number-isnan.ts","../src/lib/abstract-ops/ecmascript.ts","../src/lib/abstract-ops/miscellaneous.ts","../src/lib/abstract-ops/queue-with-sizes.ts","../src/lib/readable-stream/byte-stream-controller.ts","../src/lib/readable-stream/byob-reader.ts","../src/lib/abstract-ops/queuing-strategy.ts","../src/lib/validators/queuing-strategy.ts","../src/lib/validators/underlying-sink.ts","../src/lib/validators/writable-stream.ts","../src/lib/abort-signal.ts","../src/lib/writable-stream.ts","../src/stub/native.ts","../src/stub/dom-exception.ts","../src/lib/readable-stream/pipe.ts","../src/lib/readable-stream/default-controller.ts","../src/lib/readable-stream/tee.ts","../src/lib/validators/underlying-source.ts","../src/lib/validators/reader-options.ts","../src/lib/validators/pipe-options.ts","../src/lib/readable-stream.ts","../src/lib/validators/readable-writable-pair.ts","../src/lib/validators/iterator-options.ts","../src/lib/validators/queuing-strategy-init.ts","../src/lib/byte-length-queuing-strategy.ts","../src/lib/count-queuing-strategy.ts","../src/lib/validators/transformer.ts","../src/lib/transform-stream.ts","../src/polyfill.ts"],"sourcesContent":["/// <reference lib=\"es2015.symbol\" />\n\nconst SymbolPolyfill: (description?: string) => symbol =\n  typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol' ?\n    Symbol :\n    description => `Symbol(${description})` as any as symbol;\n\nexport default SymbolPolyfill;\n","/// <reference lib=\"dom\" />\n\nexport function noop(): undefined {\n  return undefined;\n}\n\nfunction getGlobals() {\n  if (typeof self !== 'undefined') {\n    return self;\n  } else if (typeof window !== 'undefined') {\n    return window;\n  } else if (typeof global !== 'undefined') {\n    return global;\n  }\n  return undefined;\n}\n\nexport const globals = getGlobals();\n","import { noop } from '../../utils';\nimport { AssertionError } from '../../stub/assert';\n\nexport function typeIsObject(x: any): x is object {\n  return (typeof x === 'object' && x !== null) || typeof x === 'function';\n}\n\nexport const rethrowAssertionErrorRejection: (e: any) => void =\n  DEBUG ? e => {\n    // Used throughout the reference implementation, as `.catch(rethrowAssertionErrorRejection)`, to ensure any errors\n    // get shown. There are places in the spec where we do promise transformations and purposefully ignore or don't\n    // expect any errors, but assertion errors are always problematic.\n    if (e && e instanceof AssertionError) {\n      setTimeout(() => {\n        throw e;\n      }, 0);\n    }\n  } : noop;\n","import { globals } from '../../utils';\nimport { rethrowAssertionErrorRejection } from './miscellaneous';\nimport assert from '../../stub/assert';\n\nconst originalPromise = Promise;\nconst originalPromiseThen = Promise.prototype.then;\nconst originalPromiseResolve = Promise.resolve.bind(originalPromise);\nconst originalPromiseReject = Promise.reject.bind(originalPromise);\n\nexport function newPromise<T>(executor: (\n  resolve: (value: T | PromiseLike<T>) => void,\n  reject: (reason?: any) => void\n) => void): Promise<T> {\n  return new originalPromise(executor);\n}\n\nexport function promiseResolvedWith<T>(value: T | PromiseLike<T>): Promise<T> {\n  return originalPromiseResolve(value);\n}\n\nexport function promiseRejectedWith<T = never>(reason: any): Promise<T> {\n  return originalPromiseReject(reason);\n}\n\nexport function PerformPromiseThen<T, TResult1 = T, TResult2 = never>(\n  promise: Promise<T>,\n  onFulfilled?: (value: T) => TResult1 | PromiseLike<TResult1>,\n  onRejected?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2> {\n  // There doesn't appear to be any way to correctly emulate the behaviour from JavaScript, so this is just an\n  // approximation.\n  return originalPromiseThen.call(promise, onFulfilled, onRejected) as Promise<TResult1 | TResult2>;\n}\n\nexport function uponPromise<T>(\n  promise: Promise<T>,\n  onFulfilled?: (value: T) => void | PromiseLike<void>,\n  onRejected?: (reason: any) => void | PromiseLike<void>): void {\n  PerformPromiseThen(\n    PerformPromiseThen(promise, onFulfilled, onRejected),\n    undefined,\n    rethrowAssertionErrorRejection\n  );\n}\n\nexport function uponFulfillment<T>(promise: Promise<T>, onFulfilled: (value: T) => void | PromiseLike<void>): void {\n  uponPromise(promise, onFulfilled);\n}\n\nexport function uponRejection(promise: Promise<unknown>, onRejected: (reason: any) => void | PromiseLike<void>): void {\n  uponPromise(promise, undefined, onRejected);\n}\n\nexport function transformPromiseWith<T, TResult1 = T, TResult2 = never>(\n  promise: Promise<T>,\n  fulfillmentHandler?: (value: T) => TResult1 | PromiseLike<TResult1>,\n  rejectionHandler?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2> {\n  return PerformPromiseThen(promise, fulfillmentHandler, rejectionHandler);\n}\n\nexport function setPromiseIsHandledToTrue(promise: Promise<unknown>): void {\n  PerformPromiseThen(promise, undefined, rethrowAssertionErrorRejection);\n}\n\nexport const queueMicrotask: (fn: () => void) => void = (() => {\n  const globalQueueMicrotask = globals && globals.queueMicrotask;\n  if (typeof globalQueueMicrotask === 'function') {\n    return globalQueueMicrotask;\n  }\n\n  const resolvedPromise = promiseResolvedWith(undefined);\n  return (fn: () => void) => PerformPromiseThen(resolvedPromise, fn);\n})();\n\nexport function reflectCall<T, A extends any[], R>(F: (this: T, ...fnArgs: A) => R, V: T, args: A): R {\n  if (typeof F !== 'function') {\n    throw new TypeError('Argument is not a function');\n  }\n  return Function.prototype.apply.call(F, V, args);\n}\n\nexport function promiseCall<T, A extends any[], R>(F: (this: T, ...fnArgs: A) => R | PromiseLike<R>,\n                                                   V: T,\n                                                   args: A): Promise<R> {\n  assert(typeof F === 'function');\n  assert(V !== undefined);\n  assert(Array.isArray(args));\n  try {\n    return promiseResolvedWith(reflectCall(F, V, args));\n  } catch (value) {\n    return promiseRejectedWith(value);\n  }\n}\n","import assert from '../stub/assert';\n\n// Original from Chromium\n// https://chromium.googlesource.com/chromium/src/+/0aee4434a4dba42a42abaea9bfbc0cd196a63bc1/third_party/blink/renderer/core/streams/SimpleQueue.js\n\nconst QUEUE_MAX_ARRAY_SIZE = 16384;\n\ninterface Node<T> {\n  _elements: T[];\n  _next: Node<T> | undefined;\n}\n\n/**\n * Simple queue structure.\n *\n * Avoids scalability issues with using a packed array directly by using\n * multiple arrays in a linked list and keeping the array size bounded.\n */\nexport class SimpleQueue<T> {\n  private _front: Node<T>;\n  private _back: Node<T>;\n  private _cursor = 0;\n  private _size = 0;\n\n  constructor() {\n    // _front and _back are always defined.\n    this._front = {\n      _elements: [],\n      _next: undefined\n    };\n    this._back = this._front;\n    // The cursor is used to avoid calling Array.shift().\n    // It contains the index of the front element of the array inside the\n    // front-most node. It is always in the range [0, QUEUE_MAX_ARRAY_SIZE).\n    this._cursor = 0;\n    // When there is only one node, size === elements.length - cursor.\n    this._size = 0;\n  }\n\n  get length(): number {\n    return this._size;\n  }\n\n  // For exception safety, this method is structured in order:\n  // 1. Read state\n  // 2. Calculate required state mutations\n  // 3. Perform state mutations\n  push(element: T): void {\n    const oldBack = this._back;\n    let newBack = oldBack;\n    assert(oldBack._next === undefined);\n    if (oldBack._elements.length === QUEUE_MAX_ARRAY_SIZE - 1) {\n      newBack = {\n        _elements: [],\n        _next: undefined\n      };\n    }\n\n    // push() is the mutation most likely to throw an exception, so it\n    // goes first.\n    oldBack._elements.push(element);\n    if (newBack !== oldBack) {\n      this._back = newBack;\n      oldBack._next = newBack;\n    }\n    ++this._size;\n  }\n\n  // Like push(), shift() follows the read -> calculate -> mutate pattern for\n  // exception safety.\n  shift(): T {\n    assert(this._size > 0); // must not be called on an empty queue\n\n    const oldFront = this._front;\n    let newFront = oldFront;\n    const oldCursor = this._cursor;\n    let newCursor = oldCursor + 1;\n\n    const elements = oldFront._elements;\n    const element = elements[oldCursor];\n\n    if (newCursor === QUEUE_MAX_ARRAY_SIZE) {\n      assert(elements.length === QUEUE_MAX_ARRAY_SIZE);\n      assert(oldFront._next !== undefined);\n      newFront = oldFront._next!;\n      newCursor = 0;\n    }\n\n    // No mutations before this point.\n    --this._size;\n    this._cursor = newCursor;\n    if (oldFront !== newFront) {\n      this._front = newFront;\n    }\n\n    // Permit shifted element to be garbage collected.\n    elements[oldCursor] = undefined!;\n\n    return element;\n  }\n\n  // The tricky thing about forEach() is that it can be called\n  // re-entrantly. The queue may be mutated inside the callback. It is easy to\n  // see that push() within the callback has no negative effects since the end\n  // of the queue is checked for on every iteration. If shift() is called\n  // repeatedly within the callback then the next iteration may return an\n  // element that has been removed. In this case the callback will be called\n  // with undefined values until we either \"catch up\" with elements that still\n  // exist or reach the back of the queue.\n  forEach(callback: (element: T) => void): void {\n    let i = this._cursor;\n    let node = this._front;\n    let elements = node._elements;\n    while (i !== elements.length || node._next !== undefined) {\n      if (i === elements.length) {\n        assert(node._next !== undefined);\n        assert(i === QUEUE_MAX_ARRAY_SIZE);\n        node = node._next!;\n        elements = node._elements;\n        i = 0;\n        if (elements.length === 0) {\n          break;\n        }\n      }\n      callback(elements[i]);\n      ++i;\n    }\n  }\n\n  // Return the element that would be returned if shift() was called now,\n  // without modifying the queue.\n  peek(): T {\n    assert(this._size > 0); // must not be called on an empty queue\n\n    const front = this._front;\n    const cursor = this._cursor;\n    return front._elements[cursor];\n  }\n}\n","import assert from '../../stub/assert';\nimport { ReadableStream, ReadableStreamCancel, ReadableStreamReader } from '../readable-stream';\nimport { newPromise, setPromiseIsHandledToTrue } from '../helpers/webidl';\n\nexport function ReadableStreamReaderGenericInitialize<R>(reader: ReadableStreamReader<R>, stream: ReadableStream<R>) {\n  reader._ownerReadableStream = stream;\n  stream._reader = reader;\n\n  if (stream._state === 'readable') {\n    defaultReaderClosedPromiseInitialize(reader);\n  } else if (stream._state === 'closed') {\n    defaultReaderClosedPromiseInitializeAsResolved(reader);\n  } else {\n    assert(stream._state === 'errored');\n\n    defaultReaderClosedPromiseInitializeAsRejected(reader, stream._storedError);\n  }\n}\n\n// A client of ReadableStreamDefaultReader and ReadableStreamBYOBReader may use these functions directly to bypass state\n// check.\n\nexport function ReadableStreamReaderGenericCancel(reader: ReadableStreamReader<any>, reason: any): Promise<undefined> {\n  const stream = reader._ownerReadableStream;\n  assert(stream !== undefined);\n  return ReadableStreamCancel(stream, reason);\n}\n\nexport function ReadableStreamReaderGenericRelease(reader: ReadableStreamReader<any>) {\n  assert(reader._ownerReadableStream !== undefined);\n  assert(reader._ownerReadableStream._reader === reader);\n\n  if (reader._ownerReadableStream._state === 'readable') {\n    defaultReaderClosedPromiseReject(\n      reader,\n      new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));\n  } else {\n    defaultReaderClosedPromiseResetToRejected(\n      reader,\n      new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));\n  }\n\n  reader._ownerReadableStream._reader = undefined;\n  reader._ownerReadableStream = undefined!;\n}\n\n// Helper functions for the readers.\n\nexport function readerLockException(name: string): TypeError {\n  return new TypeError('Cannot ' + name + ' a stream using a released reader');\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nexport function defaultReaderClosedPromiseInitialize(reader: ReadableStreamReader<any>) {\n  reader._closedPromise = newPromise((resolve, reject) => {\n    reader._closedPromise_resolve = resolve;\n    reader._closedPromise_reject = reject;\n  });\n}\n\nexport function defaultReaderClosedPromiseInitializeAsRejected(reader: ReadableStreamReader<any>, reason: any) {\n  defaultReaderClosedPromiseInitialize(reader);\n  defaultReaderClosedPromiseReject(reader, reason);\n}\n\nexport function defaultReaderClosedPromiseInitializeAsResolved(reader: ReadableStreamReader<any>) {\n  defaultReaderClosedPromiseInitialize(reader);\n  defaultReaderClosedPromiseResolve(reader);\n}\n\nexport function defaultReaderClosedPromiseReject(reader: ReadableStreamReader<any>, reason: any) {\n  if (reader._closedPromise_reject === undefined) {\n    return;\n  }\n\n  setPromiseIsHandledToTrue(reader._closedPromise);\n  reader._closedPromise_reject(reason);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n\nexport function defaultReaderClosedPromiseResetToRejected(reader: ReadableStreamReader<any>, reason: any) {\n  assert(reader._closedPromise_resolve === undefined);\n  assert(reader._closedPromise_reject === undefined);\n\n  defaultReaderClosedPromiseInitializeAsRejected(reader, reason);\n}\n\nexport function defaultReaderClosedPromiseResolve(reader: ReadableStreamReader<any>) {\n  if (reader._closedPromise_resolve === undefined) {\n    return;\n  }\n\n  reader._closedPromise_resolve(undefined);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n","export const AbortSteps = Symbol('[[AbortSteps]]');\nexport const ErrorSteps = Symbol('[[ErrorSteps]]');\nexport const CancelSteps = Symbol('[[CancelSteps]]');\nexport const PullSteps = Symbol('[[PullSteps]]');\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite#Polyfill\nconst NumberIsFinite: typeof Number.isFinite = Number.isFinite || function (x) {\n  return typeof x === 'number' && isFinite(x);\n};\n\nexport default NumberIsFinite;\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc#Polyfill\nconst MathTrunc: typeof Math.trunc = Math.trunc || function (v) {\n  return v < 0 ? Math.ceil(v) : Math.floor(v);\n};\n\nexport default MathTrunc;\n","import NumberIsFinite from '../../stub/number-isfinite';\nimport MathTrunc from '../../stub/math-trunc';\n\n// https://heycam.github.io/webidl/#idl-dictionaries\nexport function isDictionary(x: any): x is object | null {\n  return typeof x === 'object' || typeof x === 'function';\n}\n\nexport function assertDictionary(obj: unknown,\n                                 context: string): asserts obj is object | null | undefined {\n  if (obj !== undefined && !isDictionary(obj)) {\n    throw new TypeError(`${context} is not an object.`);\n  }\n}\n\nexport type AnyFunction = (...args: any[]) => any;\n\n// https://heycam.github.io/webidl/#idl-callback-functions\nexport function assertFunction(x: unknown, context: string): asserts x is AnyFunction {\n  if (typeof x !== 'function') {\n    throw new TypeError(`${context} is not a function.`);\n  }\n}\n\n// https://heycam.github.io/webidl/#idl-object\nexport function isObject(x: any): x is object {\n  return (typeof x === 'object' && x !== null) || typeof x === 'function';\n}\n\nexport function assertObject(x: unknown,\n                             context: string): asserts x is object {\n  if (!isObject(x)) {\n    throw new TypeError(`${context} is not an object.`);\n  }\n}\n\nexport function assertRequiredArgument<T extends any>(x: T | undefined,\n                                                      position: number,\n                                                      context: string): asserts x is T {\n  if (x === undefined) {\n    throw new TypeError(`Parameter ${position} is required in '${context}'.`);\n  }\n}\n\nexport function assertRequiredField<T extends any>(x: T | undefined,\n                                                   field: string,\n                                                   context: string): asserts x is T {\n  if (x === undefined) {\n    throw new TypeError(`${field} is required in '${context}'.`);\n  }\n}\n\n// https://heycam.github.io/webidl/#idl-unrestricted-double\nexport function convertUnrestrictedDouble(value: unknown): number {\n  return Number(value);\n}\n\nfunction censorNegativeZero(x: number): number {\n  return x === 0 ? 0 : x;\n}\n\nfunction integerPart(x: number): number {\n  return censorNegativeZero(MathTrunc(x));\n}\n\n// https://heycam.github.io/webidl/#idl-unsigned-long-long\nexport function convertUnsignedLongLongWithEnforceRange(value: unknown, context: string): number {\n  const lowerBound = 0;\n  const upperBound = Number.MAX_SAFE_INTEGER;\n\n  let x = Number(value);\n  x = censorNegativeZero(x);\n\n  if (!NumberIsFinite(x)) {\n    throw new TypeError(`${context} is not a finite number`);\n  }\n\n  x = integerPart(x);\n\n  if (x < lowerBound || x > upperBound) {\n    throw new TypeError(`${context} is outside the accepted range of ${lowerBound} to ${upperBound}, inclusive`);\n  }\n\n  if (!NumberIsFinite(x) || x === 0) {\n    return 0;\n  }\n\n  // TODO Use BigInt if supported?\n  // let xBigInt = BigInt(integerPart(x));\n  // xBigInt = BigInt.asUintN(64, xBigInt);\n  // return Number(xBigInt);\n\n  return x;\n}\n","import { IsReadableStream, ReadableStream } from '../readable-stream';\n\nexport function assertReadableStream(x: unknown, context: string): asserts x is ReadableStream {\n  if (!IsReadableStream(x)) {\n    throw new TypeError(`${context} is not a ReadableStream.`);\n  }\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericInitialize,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport { IsReadableStreamLocked, ReadableStream } from '../readable-stream';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { PullSteps } from '../abstract-ops/internal-methods';\nimport { newPromise, promiseRejectedWith } from '../helpers/webidl';\nimport { assertRequiredArgument } from '../validators/basic';\nimport { assertReadableStream } from '../validators/readable-stream';\n\n/**\n * A result returned by {@link ReadableStreamDefaultReader.read}.\n *\n * @public\n */\nexport type ReadableStreamDefaultReadResult<T> = {\n  done: false;\n  value: T;\n} | {\n  done: true;\n  value?: undefined;\n}\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamDefaultReader<R>(stream: ReadableStream): ReadableStreamDefaultReader<R> {\n  return new ReadableStreamDefaultReader(stream);\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamAddReadRequest<R>(stream: ReadableStream<R>,\n                                                readRequest: ReadRequest<R>): void {\n  assert(IsReadableStreamDefaultReader(stream._reader));\n  assert(stream._state === 'readable');\n\n  (stream._reader! as ReadableStreamDefaultReader<R>)._readRequests.push(readRequest);\n}\n\nexport function ReadableStreamFulfillReadRequest<R>(stream: ReadableStream<R>, chunk: R | undefined, done: boolean) {\n  const reader = stream._reader as ReadableStreamDefaultReader<R>;\n\n  assert(reader._readRequests.length > 0);\n\n  const readRequest = reader._readRequests.shift()!;\n  if (done) {\n    readRequest._closeSteps();\n  } else {\n    readRequest._chunkSteps(chunk!);\n  }\n}\n\nexport function ReadableStreamGetNumReadRequests<R>(stream: ReadableStream<R>): number {\n  return (stream._reader as ReadableStreamDefaultReader<R>)._readRequests.length;\n}\n\nexport function ReadableStreamHasDefaultReader(stream: ReadableStream): boolean {\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return false;\n  }\n\n  if (!IsReadableStreamDefaultReader(reader)) {\n    return false;\n  }\n\n  return true;\n}\n\n// Readers\n\nexport interface ReadRequest<R> {\n  _chunkSteps(chunk: R): void;\n\n  _closeSteps(): void;\n\n  _errorSteps(e: any): void;\n}\n\n/**\n * A default reader vended by a {@link ReadableStream}.\n *\n * @public\n */\nexport class ReadableStreamDefaultReader<R = any> {\n  /** @internal */\n  _ownerReadableStream!: ReadableStream<R>;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readRequests: SimpleQueue<ReadRequest<R>>;\n\n  constructor(stream: ReadableStream<R>) {\n    assertRequiredArgument(stream, 1, 'ReadableStreamDefaultReader');\n    assertReadableStream(stream, 'First parameter');\n\n    if (IsReadableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n    }\n\n    ReadableStreamReaderGenericInitialize(this, stream);\n\n    this._readRequests = new SimpleQueue();\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed,\n   * or rejected if the stream ever errors or the reader's lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('cancel'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('cancel'));\n    }\n\n    return ReadableStreamReaderGenericCancel(this, reason);\n  }\n\n  /**\n   * Returns a promise that allows access to the next chunk from the stream's internal queue, if available.\n   *\n   * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.\n   */\n  read(): Promise<ReadableStreamDefaultReadResult<R>> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('read'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('read from'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamDefaultReadResult<R>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamDefaultReadResult<R>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),\n      _closeSteps: () => resolvePromise({ value: undefined, done: true }),\n      _errorSteps: e => rejectPromise(e)\n    };\n    ReadableStreamDefaultReaderRead(this, readRequest);\n    return promise;\n  }\n\n  /**\n   * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.\n   * If the associated stream is errored when the lock is released, the reader will appear errored in the same way\n   * from now on; otherwise, the reader will appear closed.\n   *\n   * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by\n   * the reader's {@link ReadableStreamDefaultReader.read | read()} method has not yet been settled. Attempting to\n   * do so will throw a `TypeError` and leave the reader locked to the stream.\n   */\n  releaseLock(): void {\n    if (!IsReadableStreamDefaultReader(this)) {\n      throw defaultReaderBrandCheckException('releaseLock');\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return;\n    }\n\n    if (this._readRequests.length > 0) {\n      throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n    }\n\n    ReadableStreamReaderGenericRelease(this);\n  }\n}\n\nObject.defineProperties(ReadableStreamDefaultReader.prototype, {\n  cancel: { enumerable: true },\n  read: { enumerable: true },\n  releaseLock: { enumerable: true },\n  closed: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamDefaultReader.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamDefaultReader',\n    configurable: true\n  });\n}\n\n// Abstract operations for the readers.\n\nexport function IsReadableStreamDefaultReader<R = any>(x: any): x is ReadableStreamDefaultReader<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readRequests')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamDefaultReader;\n}\n\nexport function ReadableStreamDefaultReaderRead<R>(reader: ReadableStreamDefaultReader<R>,\n                                                   readRequest: ReadRequest<R>): void {\n  const stream = reader._ownerReadableStream;\n\n  assert(stream !== undefined);\n\n  stream._disturbed = true;\n\n  if (stream._state === 'closed') {\n    readRequest._closeSteps();\n  } else if (stream._state === 'errored') {\n    readRequest._errorSteps(stream._storedError);\n  } else {\n    assert(stream._state === 'readable');\n    stream._readableStreamController[PullSteps](readRequest as ReadRequest<any>);\n  }\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nfunction defaultReaderBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamDefaultReader.prototype.${name} can only be used on a ReadableStreamDefaultReader`);\n}\n","/// <reference lib=\"es2018.asynciterable\" />\n\nexport let AsyncIteratorPrototype: AsyncIterable<any> | undefined;\n\nif (typeof Symbol.asyncIterator === 'symbol') {\n  // We're running inside a ES2018+ environment, but we're compiling to an older syntax.\n  // We cannot access %AsyncIteratorPrototype% without non-ES2018 syntax, but we can re-create it.\n  AsyncIteratorPrototype = {\n    // 25.1.3.1 %AsyncIteratorPrototype% [ @@asyncIterator ] ( )\n    // https://tc39.github.io/ecma262/#sec-asynciteratorprototype-asynciterator\n    [Symbol.asyncIterator](this: AsyncIterator<any>) {\n      return this;\n    }\n  };\n  Object.defineProperty(AsyncIteratorPrototype, Symbol.asyncIterator, { enumerable: false });\n}\n","/// <reference lib=\"es2018.asynciterable\" />\n\nimport { ReadableStream } from '../readable-stream';\nimport {\n  AcquireReadableStreamDefaultReader,\n  ReadableStreamDefaultReader,\n  ReadableStreamDefaultReaderRead,\n  ReadableStreamDefaultReadResult,\n  ReadRequest\n} from './default-reader';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport assert from '../../stub/assert';\nimport { AsyncIteratorPrototype } from '@@target/stub/async-iterator-prototype';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport {\n  newPromise,\n  promiseRejectedWith,\n  promiseResolvedWith,\n  queueMicrotask,\n  transformPromiseWith\n} from '../helpers/webidl';\n\n/**\n * An async iterator returned by {@link ReadableStream.values}.\n *\n * @public\n */\nexport interface ReadableStreamAsyncIterator<R> extends AsyncIterator<R> {\n  next(): Promise<IteratorResult<R, undefined>>;\n\n  return(value?: any): Promise<IteratorResult<any>>;\n}\n\nexport class ReadableStreamAsyncIteratorImpl<R> {\n  private readonly _reader: ReadableStreamDefaultReader<R>;\n  private readonly _preventCancel: boolean;\n  private _ongoingPromise: Promise<ReadableStreamDefaultReadResult<R>> | undefined = undefined;\n  private _isFinished = false;\n\n  constructor(reader: ReadableStreamDefaultReader<R>, preventCancel: boolean) {\n    this._reader = reader;\n    this._preventCancel = preventCancel;\n  }\n\n  next(): Promise<ReadableStreamDefaultReadResult<R>> {\n    const nextSteps = () => this._nextSteps();\n    this._ongoingPromise = this._ongoingPromise ?\n      transformPromiseWith(this._ongoingPromise, nextSteps, nextSteps) :\n      nextSteps();\n    return this._ongoingPromise;\n  }\n\n  return(value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    const returnSteps = () => this._returnSteps(value);\n    return this._ongoingPromise ?\n      transformPromiseWith(this._ongoingPromise, returnSteps, returnSteps) :\n      returnSteps();\n  }\n\n  private _nextSteps(): Promise<ReadableStreamDefaultReadResult<R>> {\n    if (this._isFinished) {\n      return Promise.resolve({ value: undefined, done: true });\n    }\n\n    const reader = this._reader;\n    if (reader._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('iterate'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamDefaultReadResult<R>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamDefaultReadResult<R>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => {\n        this._ongoingPromise = undefined;\n        // This needs to be delayed by one microtask, otherwise we stop pulling too early which breaks a test.\n        // FIXME Is this a bug in the specification, or in the test?\n        queueMicrotask(() => resolvePromise({ value: chunk, done: false }));\n      },\n      _closeSteps: () => {\n        this._ongoingPromise = undefined;\n        this._isFinished = true;\n        ReadableStreamReaderGenericRelease(reader);\n        resolvePromise({ value: undefined, done: true });\n      },\n      _errorSteps: reason => {\n        this._ongoingPromise = undefined;\n        this._isFinished = true;\n        ReadableStreamReaderGenericRelease(reader);\n        rejectPromise(reason);\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n    return promise;\n  }\n\n  private _returnSteps(value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (this._isFinished) {\n      return Promise.resolve({ value, done: true });\n    }\n    this._isFinished = true;\n\n    const reader = this._reader;\n    if (reader._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('finish iterating'));\n    }\n\n    assert(reader._readRequests.length === 0);\n\n    if (!this._preventCancel) {\n      const result = ReadableStreamReaderGenericCancel(reader, value);\n      ReadableStreamReaderGenericRelease(reader);\n      return transformPromiseWith(result, () => ({ value, done: true }));\n    }\n\n    ReadableStreamReaderGenericRelease(reader);\n    return promiseResolvedWith({ value, done: true });\n  }\n}\n\ndeclare class ReadableStreamAsyncIteratorInstance<R> implements ReadableStreamAsyncIterator<R> {\n  /** @interal */\n  _asyncIteratorImpl: ReadableStreamAsyncIteratorImpl<R>;\n\n  next(): Promise<IteratorResult<R, undefined>>;\n\n  return(value?: any): Promise<IteratorResult<any>>;\n}\n\nconst ReadableStreamAsyncIteratorPrototype: ReadableStreamAsyncIteratorInstance<any> = {\n  next(this: ReadableStreamAsyncIteratorInstance<any>): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (!IsReadableStreamAsyncIterator(this)) {\n      return promiseRejectedWith(streamAsyncIteratorBrandCheckException('next'));\n    }\n    return this._asyncIteratorImpl.next();\n  },\n\n  return(this: ReadableStreamAsyncIteratorInstance<any>, value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (!IsReadableStreamAsyncIterator(this)) {\n      return promiseRejectedWith(streamAsyncIteratorBrandCheckException('return'));\n    }\n    return this._asyncIteratorImpl.return(value);\n  }\n} as any;\nif (AsyncIteratorPrototype !== undefined) {\n  Object.setPrototypeOf(ReadableStreamAsyncIteratorPrototype, AsyncIteratorPrototype);\n}\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamAsyncIterator<R>(stream: ReadableStream<R>,\n                                                      preventCancel: boolean): ReadableStreamAsyncIterator<R> {\n  const reader = AcquireReadableStreamDefaultReader<R>(stream);\n  const impl = new ReadableStreamAsyncIteratorImpl(reader, preventCancel);\n  const iterator: ReadableStreamAsyncIteratorInstance<R> = Object.create(ReadableStreamAsyncIteratorPrototype);\n  iterator._asyncIteratorImpl = impl;\n  return iterator;\n}\n\nfunction IsReadableStreamAsyncIterator<R = any>(x: any): x is ReadableStreamAsyncIterator<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_asyncIteratorImpl')) {\n    return false;\n  }\n\n  try {\n    // noinspection SuspiciousTypeOfGuard\n    return (x as ReadableStreamAsyncIteratorInstance<any>)._asyncIteratorImpl instanceof\n      ReadableStreamAsyncIteratorImpl;\n  } catch {\n    return false;\n  }\n}\n\n// Helper functions for the ReadableStream.\n\nfunction streamAsyncIteratorBrandCheckException(name: string): TypeError {\n  return new TypeError(`ReadableStreamAsyncIterator.${name} can only be used on a ReadableSteamAsyncIterator`);\n}\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Polyfill\nconst NumberIsNaN: typeof Number.isNaN = Number.isNaN || function (x) {\n  // eslint-disable-next-line no-self-compare\n  return x !== x;\n};\n\nexport default NumberIsNaN;\n","export function CreateArrayFromList<T extends any[]>(elements: T): T {\n  // We use arrays to represent lists, so this is basically a no-op.\n  // Do a slice though just in case we happen to depend on the unique-ness.\n  return elements.slice() as T;\n}\n\nexport function CopyDataBlockBytes(dest: ArrayBuffer,\n                                   destOffset: number,\n                                   src: ArrayBuffer,\n                                   srcOffset: number,\n                                   n: number) {\n  new Uint8Array(dest).set(new Uint8Array(src, srcOffset, n), destOffset);\n}\n\n// Not implemented correctly\nexport function TransferArrayBuffer<T extends ArrayBufferLike>(O: T): T {\n  return O;\n}\n\n// Not implemented correctly\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nexport function CanTransferArrayBuffer(O: ArrayBufferLike): boolean {\n  return true;\n}\n\n// Not implemented correctly\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nexport function IsDetachedBuffer(O: ArrayBufferLike): boolean {\n  return false;\n}\n\nexport function ArrayBufferSlice(buffer: ArrayBufferLike, begin: number, end: number): ArrayBufferLike {\n  // ArrayBuffer.prototype.slice is not available on IE10\n  // https://www.caniuse.com/mdn-javascript_builtins_arraybuffer_slice\n  if (buffer.slice) {\n    return buffer.slice(begin, end);\n  }\n  const length = end - begin;\n  const slice = new ArrayBuffer(length);\n  CopyDataBlockBytes(slice, 0, buffer, begin, length);\n  return slice;\n}\n","import NumberIsNaN from '../../stub/number-isnan';\nimport { ArrayBufferSlice } from './ecmascript';\n\nexport function IsNonNegativeNumber(v: number): boolean {\n  if (typeof v !== 'number') {\n    return false;\n  }\n\n  if (NumberIsNaN(v)) {\n    return false;\n  }\n\n  if (v < 0) {\n    return false;\n  }\n\n  return true;\n}\n\nexport function CloneAsUint8Array(O: ArrayBufferView): Uint8Array {\n  const buffer = ArrayBufferSlice(O.buffer, O.byteOffset, O.byteOffset + O.byteLength);\n  return new Uint8Array(buffer);\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport { IsNonNegativeNumber } from './miscellaneous';\n\nexport interface QueueContainer<T> {\n  _queue: SimpleQueue<T>;\n  _queueTotalSize: number;\n}\n\nexport interface QueuePair<T> {\n  value: T;\n  size: number;\n}\n\nexport function DequeueValue<T>(container: QueueContainer<QueuePair<T>>): T {\n  assert('_queue' in container && '_queueTotalSize' in container);\n  assert(container._queue.length > 0);\n\n  const pair = container._queue.shift()!;\n  container._queueTotalSize -= pair.size;\n  if (container._queueTotalSize < 0) {\n    container._queueTotalSize = 0;\n  }\n\n  return pair.value;\n}\n\nexport function EnqueueValueWithSize<T>(container: QueueContainer<QueuePair<T>>, value: T, size: number) {\n  assert('_queue' in container && '_queueTotalSize' in container);\n\n  if (!IsNonNegativeNumber(size) || size === Infinity) {\n    throw new RangeError('Size must be a finite, non-NaN, non-negative number.');\n  }\n\n  container._queue.push({ value, size });\n  container._queueTotalSize += size;\n}\n\nexport function PeekQueueValue<T>(container: QueueContainer<QueuePair<T>>): T {\n  assert('_queue' in container && '_queueTotalSize' in container);\n  assert(container._queue.length > 0);\n\n  const pair = container._queue.peek();\n  return pair.value;\n}\n\nexport function ResetQueue<T>(container: QueueContainer<T>) {\n  assert('_queue' in container && '_queueTotalSize' in container);\n\n  container._queue = new SimpleQueue<T>();\n  container._queueTotalSize = 0;\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport { ResetQueue } from '../abstract-ops/queue-with-sizes';\nimport {\n  ReadableStreamAddReadRequest,\n  ReadableStreamFulfillReadRequest,\n  ReadableStreamGetNumReadRequests,\n  ReadableStreamHasDefaultReader,\n  ReadRequest\n} from './default-reader';\nimport {\n  ReadableStreamAddReadIntoRequest,\n  ReadableStreamFulfillReadIntoRequest,\n  ReadableStreamGetNumReadIntoRequests,\n  ReadableStreamHasBYOBReader,\n  ReadIntoRequest\n} from './byob-reader';\nimport NumberIsInteger from '../../stub/number-isinteger';\nimport {\n  IsReadableStreamLocked,\n  ReadableByteStream,\n  ReadableStreamClose,\n  ReadableStreamError\n} from '../readable-stream';\nimport { ValidatedUnderlyingByteSource } from './underlying-source';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport {\n  ArrayBufferSlice,\n  CanTransferArrayBuffer,\n  CopyDataBlockBytes,\n  IsDetachedBuffer,\n  TransferArrayBuffer\n} from '../abstract-ops/ecmascript';\nimport { CancelSteps, PullSteps } from '../abstract-ops/internal-methods';\nimport { promiseResolvedWith, uponPromise } from '../helpers/webidl';\nimport { assertRequiredArgument, convertUnsignedLongLongWithEnforceRange } from '../validators/basic';\n\n/**\n * A pull-into request in a {@link ReadableByteStreamController}.\n *\n * @public\n */\nexport class ReadableStreamBYOBRequest {\n  /** @internal */\n  _associatedReadableByteStreamController!: ReadableByteStreamController;\n  /** @internal */\n  _view!: ArrayBufferView | null;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the view for writing in to, or `null` if the BYOB request has already been responded to.\n   */\n  get view(): ArrayBufferView | null {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('view');\n    }\n\n    return this._view;\n  }\n\n  /**\n   * Indicates to the associated readable byte stream that `bytesWritten` bytes were written into\n   * {@link ReadableStreamBYOBRequest.view | view}, causing the result be surfaced to the consumer.\n   *\n   * After this method is called, {@link ReadableStreamBYOBRequest.view | view} will be transferred and no longer\n   * modifiable.\n   */\n  respond(bytesWritten: number): void;\n  respond(bytesWritten: number | undefined): void {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('respond');\n    }\n    assertRequiredArgument(bytesWritten, 1, 'respond');\n    bytesWritten = convertUnsignedLongLongWithEnforceRange(bytesWritten, 'First parameter');\n\n    if (this._associatedReadableByteStreamController === undefined) {\n      throw new TypeError('This BYOB request has been invalidated');\n    }\n\n    if (IsDetachedBuffer(this._view!.buffer)) {\n      throw new TypeError(`The BYOB request's buffer has been detached and so cannot be used as a response`);\n    }\n\n    assert(this._view!.byteLength > 0);\n    assert(this._view!.buffer.byteLength > 0);\n\n    ReadableByteStreamControllerRespond(this._associatedReadableByteStreamController, bytesWritten);\n  }\n\n  /**\n   * Indicates to the associated readable byte stream that instead of writing into\n   * {@link ReadableStreamBYOBRequest.view | view}, the underlying byte source is providing a new `ArrayBufferView`,\n   * which will be given to the consumer of the readable byte stream.\n   *\n   * After this method is called, `view` will be transferred and no longer modifiable.\n   */\n  respondWithNewView(view: ArrayBufferView): void;\n  respondWithNewView(view: ArrayBufferView | undefined): void {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('respondWithNewView');\n    }\n    assertRequiredArgument(view, 1, 'respondWithNewView');\n\n    if (!ArrayBuffer.isView(view)) {\n      throw new TypeError('You can only respond with array buffer views');\n    }\n\n    if (this._associatedReadableByteStreamController === undefined) {\n      throw new TypeError('This BYOB request has been invalidated');\n    }\n\n    if (IsDetachedBuffer(view.buffer)) {\n      throw new TypeError('The given view\\'s buffer has been detached and so cannot be used as a response');\n    }\n\n    ReadableByteStreamControllerRespondWithNewView(this._associatedReadableByteStreamController, view);\n  }\n}\n\nObject.defineProperties(ReadableStreamBYOBRequest.prototype, {\n  respond: { enumerable: true },\n  respondWithNewView: { enumerable: true },\n  view: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamBYOBRequest.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamBYOBRequest',\n    configurable: true\n  });\n}\n\ninterface ArrayBufferViewConstructor<T extends ArrayBufferView = ArrayBufferView> {\n  new(buffer: ArrayBufferLike, byteOffset: number, length?: number): T;\n\n  readonly prototype: T;\n  readonly BYTES_PER_ELEMENT: number;\n}\n\ninterface ByteQueueElement {\n  buffer: ArrayBufferLike;\n  byteOffset: number;\n  byteLength: number;\n}\n\ntype PullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> =\n  DefaultPullIntoDescriptor\n  | BYOBPullIntoDescriptor<T>;\n\ninterface DefaultPullIntoDescriptor {\n  buffer: ArrayBufferLike;\n  bufferByteLength: number;\n  byteOffset: number;\n  byteLength: number;\n  bytesFilled: number;\n  elementSize: number;\n  viewConstructor: ArrayBufferViewConstructor<Uint8Array>;\n  readerType: 'default';\n}\n\ninterface BYOBPullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> {\n  buffer: ArrayBufferLike;\n  bufferByteLength: number;\n  byteOffset: number;\n  byteLength: number;\n  bytesFilled: number;\n  elementSize: number;\n  viewConstructor: ArrayBufferViewConstructor<T>;\n  readerType: 'byob';\n}\n\n/**\n * Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue.\n *\n * @public\n */\nexport class ReadableByteStreamController {\n  /** @internal */\n  _controlledReadableByteStream!: ReadableByteStream;\n  /** @internal */\n  _queue!: SimpleQueue<ByteQueueElement>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _closeRequested!: boolean;\n  /** @internal */\n  _pullAgain!: boolean;\n  /** @internal */\n  _pulling !: boolean;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _pullAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _cancelAlgorithm!: (reason: any) => Promise<void>;\n  /** @internal */\n  _autoAllocateChunkSize: number | undefined;\n  /** @internal */\n  _byobRequest: ReadableStreamBYOBRequest | null;\n  /** @internal */\n  _pendingPullIntos!: SimpleQueue<PullIntoDescriptor>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the current BYOB pull request, or `null` if there isn't one.\n   */\n  get byobRequest(): ReadableStreamBYOBRequest | null {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('byobRequest');\n    }\n\n    return ReadableByteStreamControllerGetBYOBRequest(this);\n  }\n\n  /**\n   * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is\n   * over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure.\n   */\n  get desiredSize(): number | null {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('desiredSize');\n    }\n\n    return ReadableByteStreamControllerGetDesiredSize(this);\n  }\n\n  /**\n   * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from\n   * the stream, but once those are read, the stream will become closed.\n   */\n  close(): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('close');\n    }\n\n    if (this._closeRequested) {\n      throw new TypeError('The stream has already been closed; do not close it again!');\n    }\n\n    const state = this._controlledReadableByteStream._state;\n    if (state !== 'readable') {\n      throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be closed`);\n    }\n\n    ReadableByteStreamControllerClose(this);\n  }\n\n  /**\n   * Enqueues the given chunk chunk in the controlled readable stream.\n   * The chunk has to be an `ArrayBufferView` instance, or else a `TypeError` will be thrown.\n   */\n  enqueue(chunk: ArrayBufferView): void;\n  enqueue(chunk: ArrayBufferView | undefined): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('enqueue');\n    }\n\n    assertRequiredArgument(chunk, 1, 'enqueue');\n    if (!ArrayBuffer.isView(chunk)) {\n      throw new TypeError('chunk must be an array buffer view');\n    }\n    if (chunk.byteLength === 0) {\n      throw new TypeError('chunk must have non-zero byteLength');\n    }\n    if (chunk.buffer.byteLength === 0) {\n      throw new TypeError(`chunk's buffer must have non-zero byteLength`);\n    }\n\n    if (this._closeRequested) {\n      throw new TypeError('stream is closed or draining');\n    }\n\n    const state = this._controlledReadableByteStream._state;\n    if (state !== 'readable') {\n      throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be enqueued to`);\n    }\n\n    ReadableByteStreamControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.\n   */\n  error(e: any = undefined): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('error');\n    }\n\n    ReadableByteStreamControllerError(this, e);\n  }\n\n  /** @internal */\n  [CancelSteps](reason: any): Promise<void> {\n    ReadableByteStreamControllerClearPendingPullIntos(this);\n\n    ResetQueue(this);\n\n    const result = this._cancelAlgorithm(reason);\n    ReadableByteStreamControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [PullSteps](readRequest: ReadRequest<Uint8Array>): void {\n    const stream = this._controlledReadableByteStream;\n    assert(ReadableStreamHasDefaultReader(stream));\n\n    if (this._queueTotalSize > 0) {\n      assert(ReadableStreamGetNumReadRequests(stream) === 0);\n\n      const entry = this._queue.shift()!;\n      this._queueTotalSize -= entry.byteLength;\n\n      ReadableByteStreamControllerHandleQueueDrain(this);\n\n      const view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);\n\n      readRequest._chunkSteps(view);\n      return;\n    }\n\n    const autoAllocateChunkSize = this._autoAllocateChunkSize;\n    if (autoAllocateChunkSize !== undefined) {\n      let buffer: ArrayBuffer;\n      try {\n        buffer = new ArrayBuffer(autoAllocateChunkSize);\n      } catch (bufferE) {\n        readRequest._errorSteps(bufferE);\n        return;\n      }\n\n      const pullIntoDescriptor: DefaultPullIntoDescriptor = {\n        buffer,\n        bufferByteLength: autoAllocateChunkSize,\n        byteOffset: 0,\n        byteLength: autoAllocateChunkSize,\n        bytesFilled: 0,\n        elementSize: 1,\n        viewConstructor: Uint8Array,\n        readerType: 'default'\n      };\n\n      this._pendingPullIntos.push(pullIntoDescriptor);\n    }\n\n    ReadableStreamAddReadRequest(stream, readRequest);\n    ReadableByteStreamControllerCallPullIfNeeded(this);\n  }\n}\n\nObject.defineProperties(ReadableByteStreamController.prototype, {\n  close: { enumerable: true },\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  byobRequest: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableByteStreamController.prototype, Symbol.toStringTag, {\n    value: 'ReadableByteStreamController',\n    configurable: true\n  });\n}\n\n// Abstract operations for the ReadableByteStreamController.\n\nexport function IsReadableByteStreamController(x: any): x is ReadableByteStreamController {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableByteStream')) {\n    return false;\n  }\n\n  return x instanceof ReadableByteStreamController;\n}\n\nfunction IsReadableStreamBYOBRequest(x: any): x is ReadableStreamBYOBRequest {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_associatedReadableByteStreamController')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamBYOBRequest;\n}\n\nfunction ReadableByteStreamControllerCallPullIfNeeded(controller: ReadableByteStreamController): void {\n  const shouldPull = ReadableByteStreamControllerShouldCallPull(controller);\n  if (!shouldPull) {\n    return;\n  }\n\n  if (controller._pulling) {\n    controller._pullAgain = true;\n    return;\n  }\n\n  assert(!controller._pullAgain);\n\n  controller._pulling = true;\n\n  // TODO: Test controller argument\n  const pullPromise = controller._pullAlgorithm();\n  uponPromise(\n    pullPromise,\n    () => {\n      controller._pulling = false;\n\n      if (controller._pullAgain) {\n        controller._pullAgain = false;\n        ReadableByteStreamControllerCallPullIfNeeded(controller);\n      }\n    },\n    e => {\n      ReadableByteStreamControllerError(controller, e);\n    }\n  );\n}\n\nfunction ReadableByteStreamControllerClearPendingPullIntos(controller: ReadableByteStreamController) {\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n  controller._pendingPullIntos = new SimpleQueue();\n}\n\nfunction ReadableByteStreamControllerCommitPullIntoDescriptor<T extends ArrayBufferView>(\n  stream: ReadableByteStream,\n  pullIntoDescriptor: PullIntoDescriptor<T>\n) {\n  assert(stream._state !== 'errored');\n\n  let done = false;\n  if (stream._state === 'closed') {\n    assert(pullIntoDescriptor.bytesFilled === 0);\n    done = true;\n  }\n\n  const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);\n  if (pullIntoDescriptor.readerType === 'default') {\n    ReadableStreamFulfillReadRequest(stream, filledView as unknown as Uint8Array, done);\n  } else {\n    assert(pullIntoDescriptor.readerType === 'byob');\n    ReadableStreamFulfillReadIntoRequest(stream, filledView, done);\n  }\n}\n\nfunction ReadableByteStreamControllerConvertPullIntoDescriptor<T extends ArrayBufferView>(\n  pullIntoDescriptor: PullIntoDescriptor<T>\n): T {\n  const bytesFilled = pullIntoDescriptor.bytesFilled;\n  const elementSize = pullIntoDescriptor.elementSize;\n\n  assert(bytesFilled <= pullIntoDescriptor.byteLength);\n  assert(bytesFilled % elementSize === 0);\n\n  return new pullIntoDescriptor.viewConstructor(\n    pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize) as T;\n}\n\nfunction ReadableByteStreamControllerEnqueueChunkToQueue(controller: ReadableByteStreamController,\n                                                         buffer: ArrayBufferLike,\n                                                         byteOffset: number,\n                                                         byteLength: number) {\n  controller._queue.push({ buffer, byteOffset, byteLength });\n  controller._queueTotalSize += byteLength;\n}\n\nfunction ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller: ReadableByteStreamController,\n                                                                     pullIntoDescriptor: PullIntoDescriptor) {\n  const elementSize = pullIntoDescriptor.elementSize;\n\n  const currentAlignedBytes = pullIntoDescriptor.bytesFilled - pullIntoDescriptor.bytesFilled % elementSize;\n\n  const maxBytesToCopy = Math.min(controller._queueTotalSize,\n                                  pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled);\n  const maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;\n  const maxAlignedBytes = maxBytesFilled - maxBytesFilled % elementSize;\n\n  let totalBytesToCopyRemaining = maxBytesToCopy;\n  let ready = false;\n  if (maxAlignedBytes > currentAlignedBytes) {\n    totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled;\n    ready = true;\n  }\n\n  const queue = controller._queue;\n\n  while (totalBytesToCopyRemaining > 0) {\n    const headOfQueue = queue.peek();\n\n    const bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength);\n\n    const destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n    CopyDataBlockBytes(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy);\n\n    if (headOfQueue.byteLength === bytesToCopy) {\n      queue.shift();\n    } else {\n      headOfQueue.byteOffset += bytesToCopy;\n      headOfQueue.byteLength -= bytesToCopy;\n    }\n    controller._queueTotalSize -= bytesToCopy;\n\n    ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor);\n\n    totalBytesToCopyRemaining -= bytesToCopy;\n  }\n\n  if (!ready) {\n    assert(controller._queueTotalSize === 0);\n    assert(pullIntoDescriptor.bytesFilled > 0);\n    assert(pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize);\n  }\n\n  return ready;\n}\n\nfunction ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller: ReadableByteStreamController,\n                                                                size: number,\n                                                                pullIntoDescriptor: PullIntoDescriptor) {\n  assert(controller._pendingPullIntos.length === 0 || controller._pendingPullIntos.peek() === pullIntoDescriptor);\n  assert(controller._byobRequest === null);\n  pullIntoDescriptor.bytesFilled += size;\n}\n\nfunction ReadableByteStreamControllerHandleQueueDrain(controller: ReadableByteStreamController) {\n  assert(controller._controlledReadableByteStream._state === 'readable');\n\n  if (controller._queueTotalSize === 0 && controller._closeRequested) {\n    ReadableByteStreamControllerClearAlgorithms(controller);\n    ReadableStreamClose(controller._controlledReadableByteStream);\n  } else {\n    ReadableByteStreamControllerCallPullIfNeeded(controller);\n  }\n}\n\nfunction ReadableByteStreamControllerInvalidateBYOBRequest(controller: ReadableByteStreamController) {\n  if (controller._byobRequest === null) {\n    return;\n  }\n\n  controller._byobRequest._associatedReadableByteStreamController = undefined!;\n  controller._byobRequest._view = null!;\n  controller._byobRequest = null;\n}\n\nfunction ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller: ReadableByteStreamController) {\n  assert(!controller._closeRequested);\n\n  while (controller._pendingPullIntos.length > 0) {\n    if (controller._queueTotalSize === 0) {\n      return;\n    }\n\n    const pullIntoDescriptor = controller._pendingPullIntos.peek();\n\n    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {\n      ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n      ReadableByteStreamControllerCommitPullIntoDescriptor(\n        controller._controlledReadableByteStream,\n        pullIntoDescriptor\n      );\n    }\n  }\n}\n\nexport function ReadableByteStreamControllerPullInto<T extends ArrayBufferView>(\n  controller: ReadableByteStreamController,\n  view: T,\n  readIntoRequest: ReadIntoRequest<T>\n): void {\n  const stream = controller._controlledReadableByteStream;\n\n  let elementSize = 1;\n  if (view.constructor !== DataView) {\n    elementSize = (view.constructor as ArrayBufferViewConstructor<T>).BYTES_PER_ELEMENT;\n  }\n\n  const ctor = view.constructor as ArrayBufferViewConstructor<T>;\n\n  // try {\n  const buffer = TransferArrayBuffer(view.buffer);\n  // } catch (e) {\n  //   readIntoRequest._errorSteps(e);\n  //   return;\n  // }\n\n  const pullIntoDescriptor: BYOBPullIntoDescriptor<T> = {\n    buffer,\n    bufferByteLength: buffer.byteLength,\n    byteOffset: view.byteOffset,\n    byteLength: view.byteLength,\n    bytesFilled: 0,\n    elementSize,\n    viewConstructor: ctor,\n    readerType: 'byob'\n  };\n\n  if (controller._pendingPullIntos.length > 0) {\n    controller._pendingPullIntos.push(pullIntoDescriptor);\n\n    // No ReadableByteStreamControllerCallPullIfNeeded() call since:\n    // - No change happens on desiredSize\n    // - The source has already been notified of that there's at least 1 pending read(view)\n\n    ReadableStreamAddReadIntoRequest(stream, readIntoRequest);\n    return;\n  }\n\n  if (stream._state === 'closed') {\n    const emptyView = new ctor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0);\n    readIntoRequest._closeSteps(emptyView);\n    return;\n  }\n\n  if (controller._queueTotalSize > 0) {\n    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {\n      const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);\n\n      ReadableByteStreamControllerHandleQueueDrain(controller);\n\n      readIntoRequest._chunkSteps(filledView);\n      return;\n    }\n\n    if (controller._closeRequested) {\n      const e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n      ReadableByteStreamControllerError(controller, e);\n\n      readIntoRequest._errorSteps(e);\n      return;\n    }\n  }\n\n  controller._pendingPullIntos.push(pullIntoDescriptor);\n\n  ReadableStreamAddReadIntoRequest<T>(stream, readIntoRequest);\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nfunction ReadableByteStreamControllerRespondInClosedState(controller: ReadableByteStreamController,\n                                                          firstDescriptor: PullIntoDescriptor) {\n  assert(firstDescriptor.bytesFilled === 0);\n\n  const stream = controller._controlledReadableByteStream;\n  if (ReadableStreamHasBYOBReader(stream)) {\n    while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n      const pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);\n      ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);\n    }\n  }\n}\n\nfunction ReadableByteStreamControllerRespondInReadableState(controller: ReadableByteStreamController,\n                                                            bytesWritten: number,\n                                                            pullIntoDescriptor: PullIntoDescriptor) {\n  assert(pullIntoDescriptor.bytesFilled + bytesWritten <= pullIntoDescriptor.byteLength);\n\n  ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor);\n\n  if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {\n    return;\n  }\n\n  ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n  const remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize;\n  if (remainderSize > 0) {\n    const end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n    const remainder = ArrayBufferSlice(pullIntoDescriptor.buffer, end - remainderSize, end);\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength);\n  }\n\n  pullIntoDescriptor.bytesFilled -= remainderSize;\n  ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);\n\n  ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n}\n\nfunction ReadableByteStreamControllerRespondInternal(controller: ReadableByteStreamController, bytesWritten: number) {\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  assert(CanTransferArrayBuffer(firstDescriptor.buffer));\n\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n\n  const state = controller._controlledReadableByteStream._state;\n  if (state === 'closed') {\n    assert(bytesWritten === 0);\n    ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor);\n  } else {\n    assert(state === 'readable');\n    assert(bytesWritten > 0);\n    ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);\n  }\n\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nfunction ReadableByteStreamControllerShiftPendingPullInto(\n  controller: ReadableByteStreamController\n): PullIntoDescriptor {\n  assert(controller._byobRequest === null);\n  const descriptor = controller._pendingPullIntos.shift()!;\n  return descriptor;\n}\n\nfunction ReadableByteStreamControllerShouldCallPull(controller: ReadableByteStreamController): boolean {\n  const stream = controller._controlledReadableByteStream;\n\n  if (stream._state !== 'readable') {\n    return false;\n  }\n\n  if (controller._closeRequested) {\n    return false;\n  }\n\n  if (!controller._started) {\n    return false;\n  }\n\n  if (ReadableStreamHasDefaultReader(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    return true;\n  }\n\n  if (ReadableStreamHasBYOBReader(stream) && ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n    return true;\n  }\n\n  const desiredSize = ReadableByteStreamControllerGetDesiredSize(controller);\n  assert(desiredSize !== null);\n  if (desiredSize! > 0) {\n    return true;\n  }\n\n  return false;\n}\n\nfunction ReadableByteStreamControllerClearAlgorithms(controller: ReadableByteStreamController) {\n  controller._pullAlgorithm = undefined!;\n  controller._cancelAlgorithm = undefined!;\n}\n\n// A client of ReadableByteStreamController may use these functions directly to bypass state check.\n\nexport function ReadableByteStreamControllerClose(controller: ReadableByteStreamController) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (controller._closeRequested || stream._state !== 'readable') {\n    return;\n  }\n\n  if (controller._queueTotalSize > 0) {\n    controller._closeRequested = true;\n\n    return;\n  }\n\n  if (controller._pendingPullIntos.length > 0) {\n    const firstPendingPullInto = controller._pendingPullIntos.peek();\n    if (firstPendingPullInto.bytesFilled > 0) {\n      const e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n      ReadableByteStreamControllerError(controller, e);\n\n      throw e;\n    }\n  }\n\n  ReadableByteStreamControllerClearAlgorithms(controller);\n  ReadableStreamClose(stream);\n}\n\nexport function ReadableByteStreamControllerEnqueue(controller: ReadableByteStreamController, chunk: ArrayBufferView) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (controller._closeRequested || stream._state !== 'readable') {\n    return;\n  }\n\n  const buffer = chunk.buffer;\n  const byteOffset = chunk.byteOffset;\n  const byteLength = chunk.byteLength;\n  if (IsDetachedBuffer(buffer)) {\n    throw new TypeError('chunk\\'s buffer is detached and so cannot be enqueued');\n  }\n  const transferredBuffer = TransferArrayBuffer(buffer);\n\n  if (controller._pendingPullIntos.length > 0) {\n    const firstPendingPullInto = controller._pendingPullIntos.peek();\n    if (IsDetachedBuffer(firstPendingPullInto.buffer)) {\n      throw new TypeError(\n        'The BYOB request\\'s buffer has been detached and so cannot be filled with an enqueued chunk'\n      );\n    }\n    firstPendingPullInto.buffer = TransferArrayBuffer(firstPendingPullInto.buffer);\n  }\n\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n\n  if (ReadableStreamHasDefaultReader(stream)) {\n    if (ReadableStreamGetNumReadRequests(stream) === 0) {\n      assert(controller._pendingPullIntos.length === 0);\n      ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n    } else {\n      assert(controller._queue.length === 0);\n      if (controller._pendingPullIntos.length > 0) {\n        assert(controller._pendingPullIntos.peek().readerType === 'default');\n        ReadableByteStreamControllerShiftPendingPullInto(controller);\n      }\n      const transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength);\n      ReadableStreamFulfillReadRequest(stream, transferredView, false);\n    }\n  } else if (ReadableStreamHasBYOBReader(stream)) {\n    // TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully.\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n    ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n  } else {\n    assert(!IsReadableStreamLocked(stream));\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n  }\n\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nexport function ReadableByteStreamControllerError(controller: ReadableByteStreamController, e: any) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (stream._state !== 'readable') {\n    return;\n  }\n\n  ReadableByteStreamControllerClearPendingPullIntos(controller);\n\n  ResetQueue(controller);\n  ReadableByteStreamControllerClearAlgorithms(controller);\n  ReadableStreamError(stream, e);\n}\n\nexport function ReadableByteStreamControllerGetBYOBRequest(\n  controller: ReadableByteStreamController\n): ReadableStreamBYOBRequest | null {\n  if (controller._byobRequest === null && controller._pendingPullIntos.length > 0) {\n    const firstDescriptor = controller._pendingPullIntos.peek();\n    const view = new Uint8Array(firstDescriptor.buffer,\n                                firstDescriptor.byteOffset + firstDescriptor.bytesFilled,\n                                firstDescriptor.byteLength - firstDescriptor.bytesFilled);\n\n    const byobRequest: ReadableStreamBYOBRequest = Object.create(ReadableStreamBYOBRequest.prototype);\n    SetUpReadableStreamBYOBRequest(byobRequest, controller, view);\n    controller._byobRequest = byobRequest;\n  }\n  return controller._byobRequest;\n}\n\nfunction ReadableByteStreamControllerGetDesiredSize(controller: ReadableByteStreamController): number | null {\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'errored') {\n    return null;\n  }\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\nexport function ReadableByteStreamControllerRespond(controller: ReadableByteStreamController, bytesWritten: number) {\n  assert(controller._pendingPullIntos.length > 0);\n\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'closed') {\n    if (bytesWritten !== 0) {\n      throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream');\n    }\n  } else {\n    assert(state === 'readable');\n    if (bytesWritten === 0) {\n      throw new TypeError('bytesWritten must be greater than 0 when calling respond() on a readable stream');\n    }\n    if (firstDescriptor.bytesFilled + bytesWritten > firstDescriptor.byteLength) {\n      throw new RangeError('bytesWritten out of range');\n    }\n  }\n\n  firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer);\n\n  ReadableByteStreamControllerRespondInternal(controller, bytesWritten);\n}\n\nexport function ReadableByteStreamControllerRespondWithNewView(controller: ReadableByteStreamController,\n                                                               view: ArrayBufferView) {\n  assert(controller._pendingPullIntos.length > 0);\n  assert(!IsDetachedBuffer(view.buffer));\n\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'closed') {\n    if (view.byteLength !== 0) {\n      throw new TypeError('The view\\'s length must be 0 when calling respondWithNewView() on a closed stream');\n    }\n  } else {\n    assert(state === 'readable');\n    if (view.byteLength === 0) {\n      throw new TypeError(\n        'The view\\'s length must be greater than 0 when calling respondWithNewView() on a readable stream'\n      );\n    }\n  }\n\n  if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) {\n    throw new RangeError('The region specified by view does not match byobRequest');\n  }\n  if (firstDescriptor.bufferByteLength !== view.buffer.byteLength) {\n    throw new RangeError('The buffer of view has different capacity than byobRequest');\n  }\n  if (firstDescriptor.bytesFilled + view.byteLength > firstDescriptor.byteLength) {\n    throw new RangeError('The region specified by view is larger than byobRequest');\n  }\n\n  const viewByteLength = view.byteLength;\n  firstDescriptor.buffer = TransferArrayBuffer(view.buffer);\n  ReadableByteStreamControllerRespondInternal(controller, viewByteLength);\n}\n\nexport function SetUpReadableByteStreamController(stream: ReadableByteStream,\n                                                  controller: ReadableByteStreamController,\n                                                  startAlgorithm: () => void | PromiseLike<void>,\n                                                  pullAlgorithm: () => Promise<void>,\n                                                  cancelAlgorithm: (reason: any) => Promise<void>,\n                                                  highWaterMark: number,\n                                                  autoAllocateChunkSize: number | undefined) {\n  assert(stream._readableStreamController === undefined);\n  if (autoAllocateChunkSize !== undefined) {\n    assert(NumberIsInteger(autoAllocateChunkSize));\n    assert(autoAllocateChunkSize > 0);\n  }\n\n  controller._controlledReadableByteStream = stream;\n\n  controller._pullAgain = false;\n  controller._pulling = false;\n\n  controller._byobRequest = null;\n\n  // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n  controller._queue = controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._closeRequested = false;\n  controller._started = false;\n\n  controller._strategyHWM = highWaterMark;\n\n  controller._pullAlgorithm = pullAlgorithm;\n  controller._cancelAlgorithm = cancelAlgorithm;\n\n  controller._autoAllocateChunkSize = autoAllocateChunkSize;\n\n  controller._pendingPullIntos = new SimpleQueue();\n\n  stream._readableStreamController = controller;\n\n  const startResult = startAlgorithm();\n  uponPromise(\n    promiseResolvedWith(startResult),\n    () => {\n      controller._started = true;\n\n      assert(!controller._pulling);\n      assert(!controller._pullAgain);\n\n      ReadableByteStreamControllerCallPullIfNeeded(controller);\n    },\n    r => {\n      ReadableByteStreamControllerError(controller, r);\n    }\n  );\n}\n\nexport function SetUpReadableByteStreamControllerFromUnderlyingSource(\n  stream: ReadableByteStream,\n  underlyingByteSource: ValidatedUnderlyingByteSource,\n  highWaterMark: number\n) {\n  const controller: ReadableByteStreamController = Object.create(ReadableByteStreamController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let pullAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let cancelAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingByteSource.start !== undefined) {\n    startAlgorithm = () => underlyingByteSource.start!(controller);\n  }\n  if (underlyingByteSource.pull !== undefined) {\n    pullAlgorithm = () => underlyingByteSource.pull!(controller);\n  }\n  if (underlyingByteSource.cancel !== undefined) {\n    cancelAlgorithm = reason => underlyingByteSource.cancel!(reason);\n  }\n\n  const autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;\n  if (autoAllocateChunkSize === 0) {\n    throw new TypeError('autoAllocateChunkSize must be greater than 0');\n  }\n\n  SetUpReadableByteStreamController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize\n  );\n}\n\nfunction SetUpReadableStreamBYOBRequest(request: ReadableStreamBYOBRequest,\n                                        controller: ReadableByteStreamController,\n                                        view: ArrayBufferView) {\n  assert(IsReadableByteStreamController(controller));\n  assert(typeof view === 'object');\n  assert(ArrayBuffer.isView(view));\n  assert(!IsDetachedBuffer(view.buffer));\n  request._associatedReadableByteStreamController = controller;\n  request._view = view;\n}\n\n// Helper functions for the ReadableStreamBYOBRequest.\n\nfunction byobRequestBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamBYOBRequest.prototype.${name} can only be used on a ReadableStreamBYOBRequest`);\n}\n\n// Helper functions for the ReadableByteStreamController.\n\nfunction byteStreamControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableByteStreamController.prototype.${name} can only be used on a ReadableByteStreamController`);\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericInitialize,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport { IsReadableStreamLocked, ReadableByteStream, ReadableStream } from '../readable-stream';\nimport {\n  IsReadableByteStreamController,\n  ReadableByteStreamController,\n  ReadableByteStreamControllerPullInto\n} from './byte-stream-controller';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { newPromise, promiseRejectedWith } from '../helpers/webidl';\nimport { assertRequiredArgument } from '../validators/basic';\nimport { assertReadableStream } from '../validators/readable-stream';\nimport { IsDetachedBuffer } from '../abstract-ops/ecmascript';\n\n/**\n * A result returned by {@link ReadableStreamBYOBReader.read}.\n *\n * @public\n */\nexport type ReadableStreamBYOBReadResult<T extends ArrayBufferView> = {\n  done: false;\n  value: T;\n} | {\n  done: true;\n  value: T | undefined;\n};\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamBYOBReader(stream: ReadableByteStream): ReadableStreamBYOBReader {\n  return new ReadableStreamBYOBReader(stream);\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamAddReadIntoRequest<T extends ArrayBufferView>(stream: ReadableByteStream,\n                                                                            readIntoRequest: ReadIntoRequest<T>): void {\n  assert(IsReadableStreamBYOBReader(stream._reader));\n  assert(stream._state === 'readable' || stream._state === 'closed');\n\n  (stream._reader! as ReadableStreamBYOBReader)._readIntoRequests.push(readIntoRequest);\n}\n\nexport function ReadableStreamFulfillReadIntoRequest(stream: ReadableByteStream,\n                                                     chunk: ArrayBufferView,\n                                                     done: boolean) {\n  const reader = stream._reader as ReadableStreamBYOBReader;\n\n  assert(reader._readIntoRequests.length > 0);\n\n  const readIntoRequest = reader._readIntoRequests.shift()!;\n  if (done) {\n    readIntoRequest._closeSteps(chunk);\n  } else {\n    readIntoRequest._chunkSteps(chunk);\n  }\n}\n\nexport function ReadableStreamGetNumReadIntoRequests(stream: ReadableByteStream): number {\n  return (stream._reader as ReadableStreamBYOBReader)._readIntoRequests.length;\n}\n\nexport function ReadableStreamHasBYOBReader(stream: ReadableByteStream): boolean {\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return false;\n  }\n\n  if (!IsReadableStreamBYOBReader(reader)) {\n    return false;\n  }\n\n  return true;\n}\n\n// Readers\n\nexport interface ReadIntoRequest<T extends ArrayBufferView> {\n  _chunkSteps(chunk: T): void;\n\n  _closeSteps(chunk: T | undefined): void;\n\n  _errorSteps(e: any): void;\n}\n\n/**\n * A BYOB reader vended by a {@link ReadableStream}.\n *\n * @public\n */\nexport class ReadableStreamBYOBReader {\n  /** @internal */\n  _ownerReadableStream!: ReadableByteStream;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readIntoRequests: SimpleQueue<ReadIntoRequest<any>>;\n\n  constructor(stream: ReadableByteStream) {\n    assertRequiredArgument(stream, 1, 'ReadableStreamBYOBReader');\n    assertReadableStream(stream, 'First parameter');\n\n    if (IsReadableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n    }\n\n    if (!IsReadableByteStreamController(stream._readableStreamController)) {\n      throw new TypeError('Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte ' +\n        'source');\n    }\n\n    ReadableStreamReaderGenericInitialize(this, stream);\n\n    this._readIntoRequests = new SimpleQueue();\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or\n   * the reader's lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('cancel'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('cancel'));\n    }\n\n    return ReadableStreamReaderGenericCancel(this, reason);\n  }\n\n  /**\n   * Attempts to reads bytes into view, and returns a promise resolved with the result.\n   *\n   * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.\n   */\n  read<T extends ArrayBufferView>(view: T): Promise<ReadableStreamBYOBReadResult<T>> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('read'));\n    }\n\n    if (!ArrayBuffer.isView(view)) {\n      return promiseRejectedWith(new TypeError('view must be an array buffer view'));\n    }\n    if (view.byteLength === 0) {\n      return promiseRejectedWith(new TypeError('view must have non-zero byteLength'));\n    }\n    if (view.buffer.byteLength === 0) {\n      return promiseRejectedWith(new TypeError(`view's buffer must have non-zero byteLength`));\n    }\n    if (IsDetachedBuffer(view.buffer)) {\n      return promiseRejectedWith(new TypeError('view\\'s buffer has been detached'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('read from'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamBYOBReadResult<T>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamBYOBReadResult<T>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readIntoRequest: ReadIntoRequest<T> = {\n      _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),\n      _closeSteps: chunk => resolvePromise({ value: chunk, done: true }),\n      _errorSteps: e => rejectPromise(e)\n    };\n    ReadableStreamBYOBReaderRead(this, view, readIntoRequest);\n    return promise;\n  }\n\n  /**\n   * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.\n   * If the associated stream is errored when the lock is released, the reader will appear errored in the same way\n   * from now on; otherwise, the reader will appear closed.\n   *\n   * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by\n   * the reader's {@link ReadableStreamBYOBReader.read | read()} method has not yet been settled. Attempting to\n   * do so will throw a `TypeError` and leave the reader locked to the stream.\n   */\n  releaseLock(): void {\n    if (!IsReadableStreamBYOBReader(this)) {\n      throw byobReaderBrandCheckException('releaseLock');\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return;\n    }\n\n    if (this._readIntoRequests.length > 0) {\n      throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n    }\n\n    ReadableStreamReaderGenericRelease(this);\n  }\n}\n\nObject.defineProperties(ReadableStreamBYOBReader.prototype, {\n  cancel: { enumerable: true },\n  read: { enumerable: true },\n  releaseLock: { enumerable: true },\n  closed: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamBYOBReader.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamBYOBReader',\n    configurable: true\n  });\n}\n\n// Abstract operations for the readers.\n\nexport function IsReadableStreamBYOBReader(x: any): x is ReadableStreamBYOBReader {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readIntoRequests')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamBYOBReader;\n}\n\nexport function ReadableStreamBYOBReaderRead<T extends ArrayBufferView>(\n  reader: ReadableStreamBYOBReader,\n  view: T,\n  readIntoRequest: ReadIntoRequest<T>\n): void {\n  const stream = reader._ownerReadableStream;\n\n  assert(stream !== undefined);\n\n  stream._disturbed = true;\n\n  if (stream._state === 'errored') {\n    readIntoRequest._errorSteps(stream._storedError);\n  } else {\n    ReadableByteStreamControllerPullInto(\n      stream._readableStreamController as ReadableByteStreamController,\n      view,\n      readIntoRequest\n    );\n  }\n}\n\n// Helper functions for the ReadableStreamBYOBReader.\n\nfunction byobReaderBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamBYOBReader.prototype.${name} can only be used on a ReadableStreamBYOBReader`);\n}\n","import { QueuingStrategy, QueuingStrategySizeCallback } from '../queuing-strategy';\nimport NumberIsNaN from '../../stub/number-isnan';\n\nexport function ExtractHighWaterMark(strategy: QueuingStrategy, defaultHWM: number): number {\n  const { highWaterMark } = strategy;\n\n  if (highWaterMark === undefined) {\n    return defaultHWM;\n  }\n\n  if (NumberIsNaN(highWaterMark) || highWaterMark < 0) {\n    throw new RangeError('Invalid highWaterMark');\n  }\n\n  return highWaterMark;\n}\n\nexport function ExtractSizeAlgorithm<T>(strategy: QueuingStrategy<T>): QueuingStrategySizeCallback<T> {\n  const { size } = strategy;\n\n  if (!size) {\n    return () => 1;\n  }\n\n  return size;\n}\n","import { QueuingStrategy, QueuingStrategySizeCallback } from '../queuing-strategy';\nimport { assertDictionary, assertFunction, convertUnrestrictedDouble } from './basic';\n\nexport function convertQueuingStrategy<T>(init: QueuingStrategy<T> | null | undefined,\n                                          context: string): QueuingStrategy<T> {\n  assertDictionary(init, context);\n  const highWaterMark = init?.highWaterMark;\n  const size = init?.size;\n  return {\n    highWaterMark: highWaterMark === undefined ? undefined : convertUnrestrictedDouble(highWaterMark),\n    size: size === undefined ? undefined : convertQueuingStrategySize(size, `${context} has member 'size' that`)\n  };\n}\n\nfunction convertQueuingStrategySize<T>(fn: QueuingStrategySizeCallback<T>,\n                                       context: string): QueuingStrategySizeCallback<T> {\n  assertFunction(fn, context);\n  return chunk => convertUnrestrictedDouble(fn(chunk));\n}\n","import { assertDictionary, assertFunction } from './basic';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\nimport {\n  UnderlyingSink,\n  UnderlyingSinkAbortCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  ValidatedUnderlyingSink\n} from '../writable-stream/underlying-sink';\nimport { WritableStreamDefaultController } from '../writable-stream';\n\nexport function convertUnderlyingSink<W>(original: UnderlyingSink<W> | null,\n                                         context: string): ValidatedUnderlyingSink<W> {\n  assertDictionary(original, context);\n  const abort = original?.abort;\n  const close = original?.close;\n  const start = original?.start;\n  const type = original?.type;\n  const write = original?.write;\n  return {\n    abort: abort === undefined ?\n      undefined :\n      convertUnderlyingSinkAbortCallback(abort, original!, `${context} has member 'abort' that`),\n    close: close === undefined ?\n      undefined :\n      convertUnderlyingSinkCloseCallback(close, original!, `${context} has member 'close' that`),\n    start: start === undefined ?\n      undefined :\n      convertUnderlyingSinkStartCallback(start, original!, `${context} has member 'start' that`),\n    write: write === undefined ?\n      undefined :\n      convertUnderlyingSinkWriteCallback(write, original!, `${context} has member 'write' that`),\n    type\n  };\n}\n\nfunction convertUnderlyingSinkAbortCallback(\n  fn: UnderlyingSinkAbortCallback,\n  original: UnderlyingSink,\n  context: string\n): (reason: any) => Promise<void> {\n  assertFunction(fn, context);\n  return (reason: any) => promiseCall(fn, original, [reason]);\n}\n\nfunction convertUnderlyingSinkCloseCallback(\n  fn: UnderlyingSinkCloseCallback,\n  original: UnderlyingSink,\n  context: string\n): () => Promise<void> {\n  assertFunction(fn, context);\n  return () => promiseCall(fn, original, []);\n}\n\nfunction convertUnderlyingSinkStartCallback(\n  fn: UnderlyingSinkStartCallback,\n  original: UnderlyingSink,\n  context: string\n): UnderlyingSinkStartCallback {\n  assertFunction(fn, context);\n  return (controller: WritableStreamDefaultController) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertUnderlyingSinkWriteCallback<W>(\n  fn: UnderlyingSinkWriteCallback<W>,\n  original: UnderlyingSink<W>,\n  context: string\n): (chunk: W, controller: WritableStreamDefaultController) => Promise<void> {\n  assertFunction(fn, context);\n  return (chunk: W, controller: WritableStreamDefaultController) => promiseCall(fn, original, [chunk, controller]);\n}\n","import { IsWritableStream, WritableStream } from '../writable-stream';\n\nexport function assertWritableStream(x: unknown, context: string): asserts x is WritableStream {\n  if (!IsWritableStream(x)) {\n    throw new TypeError(`${context} is not a WritableStream.`);\n  }\n}\n","/**\n * A signal object that allows you to communicate with a request and abort it if required\n * via its associated `AbortController` object.\n *\n * @remarks\n *   This interface is compatible with the `AbortSignal` interface defined in TypeScript's DOM types.\n *   It is redefined here, so it can be polyfilled without a DOM, for example with\n *   {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.\n *\n * @public\n */\nexport interface AbortSignal {\n  /**\n   * Whether the request is aborted.\n   */\n  readonly aborted: boolean;\n\n  /**\n   * Add an event listener to be triggered when this signal becomes aborted.\n   */\n  addEventListener(type: 'abort', listener: () => void): void;\n\n  /**\n   * Remove an event listener that was previously added with {@link AbortSignal.addEventListener}.\n   */\n  removeEventListener(type: 'abort', listener: () => void): void;\n}\n\nexport function isAbortSignal(value: unknown): value is AbortSignal {\n  if (typeof value !== 'object' || value === null) {\n    return false;\n  }\n  try {\n    return typeof (value as AbortSignal).aborted === 'boolean';\n  } catch {\n    // AbortSignal.prototype.aborted throws if its brand check fails\n    return false;\n  }\n}\n\n/**\n * A controller object that allows you to abort an `AbortSignal` when desired.\n *\n * @remarks\n *   This interface is compatible with the `AbortController` interface defined in TypeScript's DOM types.\n *   It is redefined here, so it can be polyfilled without a DOM, for example with\n *   {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.\n *\n * @internal\n */\nexport interface AbortController {\n  readonly signal: AbortSignal;\n\n  abort(): void;\n}\n\ninterface AbortControllerConstructor {\n  new(): AbortController;\n}\n\nconst supportsAbortController = typeof (AbortController as any) === 'function';\n\n/**\n * Construct a new AbortController, if supported by the platform.\n *\n * @internal\n */\nexport function createAbortController(): AbortController | undefined {\n  if (supportsAbortController) {\n    return new (AbortController as AbortControllerConstructor)();\n  }\n  return undefined;\n}\n","import assert from '../stub/assert';\nimport {\n  newPromise,\n  promiseRejectedWith,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  uponPromise\n} from './helpers/webidl';\nimport {\n  DequeueValue,\n  EnqueueValueWithSize,\n  PeekQueueValue,\n  QueuePair,\n  ResetQueue\n} from './abstract-ops/queue-with-sizes';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { SimpleQueue } from './simple-queue';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { AbortSteps, ErrorSteps } from './abstract-ops/internal-methods';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport {\n  UnderlyingSink,\n  UnderlyingSinkAbortCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  ValidatedUnderlyingSink\n} from './writable-stream/underlying-sink';\nimport { assertObject, assertRequiredArgument } from './validators/basic';\nimport { convertUnderlyingSink } from './validators/underlying-sink';\nimport { assertWritableStream } from './validators/writable-stream';\nimport { AbortController, AbortSignal, createAbortController } from './abort-signal';\n\ntype WritableStreamState = 'writable' | 'closed' | 'erroring' | 'errored';\n\ninterface WriteOrCloseRequest {\n  _resolve: (value?: undefined) => void;\n  _reject: (reason: any) => void;\n}\n\ntype WriteRequest = WriteOrCloseRequest;\ntype CloseRequest = WriteOrCloseRequest;\n\ninterface PendingAbortRequest {\n  _promise: Promise<undefined>;\n  _resolve: (value?: undefined) => void;\n  _reject: (reason: any) => void;\n  _reason: any;\n  _wasAlreadyErroring: boolean;\n}\n\n/**\n * A writable stream represents a destination for data, into which you can write.\n *\n * @public\n */\nclass WritableStream<W = any> {\n  /** @internal */\n  _state!: WritableStreamState;\n  /** @internal */\n  _storedError: any;\n  /** @internal */\n  _writer: WritableStreamDefaultWriter<W> | undefined;\n  /** @internal */\n  _writableStreamController!: WritableStreamDefaultController<W>;\n  /** @internal */\n  _writeRequests!: SimpleQueue<WriteRequest>;\n  /** @internal */\n  _inFlightWriteRequest: WriteRequest | undefined;\n  /** @internal */\n  _closeRequest: CloseRequest | undefined;\n  /** @internal */\n  _inFlightCloseRequest: CloseRequest | undefined;\n  /** @internal */\n  _pendingAbortRequest: PendingAbortRequest | undefined;\n  /** @internal */\n  _backpressure!: boolean;\n\n  constructor(underlyingSink?: UnderlyingSink<W>, strategy?: QueuingStrategy<W>);\n  constructor(rawUnderlyingSink: UnderlyingSink<W> | null | undefined = {},\n              rawStrategy: QueuingStrategy<W> | null | undefined = {}) {\n    if (rawUnderlyingSink === undefined) {\n      rawUnderlyingSink = null;\n    } else {\n      assertObject(rawUnderlyingSink, 'First parameter');\n    }\n\n    const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');\n    const underlyingSink = convertUnderlyingSink(rawUnderlyingSink, 'First parameter');\n\n    InitializeWritableStream(this);\n\n    const type = underlyingSink.type;\n    if (type !== undefined) {\n      throw new RangeError('Invalid type is specified');\n    }\n\n    const sizeAlgorithm = ExtractSizeAlgorithm(strategy);\n    const highWaterMark = ExtractHighWaterMark(strategy, 1);\n\n    SetUpWritableStreamDefaultControllerFromUnderlyingSink(this, underlyingSink, highWaterMark, sizeAlgorithm);\n  }\n\n  /**\n   * Returns whether or not the writable stream is locked to a writer.\n   */\n  get locked(): boolean {\n    if (!IsWritableStream(this)) {\n      throw streamBrandCheckException('locked');\n    }\n\n    return IsWritableStreamLocked(this);\n  }\n\n  /**\n   * Aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be\n   * immediately moved to an errored state, with any queued-up writes discarded. This will also execute any abort\n   * mechanism of the underlying sink.\n   *\n   * The returned promise will fulfill if the stream shuts down successfully, or reject if the underlying sink signaled\n   * that there was an error doing so. Additionally, it will reject with a `TypeError` (without attempting to cancel\n   * the stream) if the stream is currently locked.\n   */\n  abort(reason: any = undefined): Promise<void> {\n    if (!IsWritableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('abort'));\n    }\n\n    if (IsWritableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot abort a stream that already has a writer'));\n    }\n\n    return WritableStreamAbort(this, reason);\n  }\n\n  /**\n   * Closes the stream. The underlying sink will finish processing any previously-written chunks, before invoking its\n   * close behavior. During this time any further attempts to write will fail (without erroring the stream).\n   *\n   * The method returns a promise that will fulfill if all remaining chunks are successfully written and the stream\n   * successfully closes, or rejects if an error is encountered during this process. Additionally, it will reject with\n   * a `TypeError` (without attempting to cancel the stream) if the stream is currently locked.\n   */\n  close() {\n    if (!IsWritableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('close'));\n    }\n\n    if (IsWritableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot close a stream that already has a writer'));\n    }\n\n    if (WritableStreamCloseQueuedOrInFlight(this)) {\n      return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));\n    }\n\n    return WritableStreamClose(this);\n  }\n\n  /**\n   * Creates a {@link WritableStreamDefaultWriter | writer} and locks the stream to the new writer. While the stream\n   * is locked, no other writer can be acquired until this one is released.\n   *\n   * This functionality is especially useful for creating abstractions that desire the ability to write to a stream\n   * without interruption or interleaving. By getting a writer for the stream, you can ensure nobody else can write at\n   * the same time, which would cause the resulting written data to be unpredictable and probably useless.\n   */\n  getWriter(): WritableStreamDefaultWriter<W> {\n    if (!IsWritableStream(this)) {\n      throw streamBrandCheckException('getWriter');\n    }\n\n    return AcquireWritableStreamDefaultWriter(this);\n  }\n}\n\nObject.defineProperties(WritableStream.prototype, {\n  abort: { enumerable: true },\n  close: { enumerable: true },\n  getWriter: { enumerable: true },\n  locked: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStream.prototype, Symbol.toStringTag, {\n    value: 'WritableStream',\n    configurable: true\n  });\n}\n\nexport {\n  AcquireWritableStreamDefaultWriter,\n  CreateWritableStream,\n  IsWritableStream,\n  IsWritableStreamLocked,\n  WritableStream,\n  WritableStreamAbort,\n  WritableStreamDefaultControllerErrorIfNeeded,\n  WritableStreamDefaultWriterCloseWithErrorPropagation,\n  WritableStreamDefaultWriterRelease,\n  WritableStreamDefaultWriterWrite,\n  WritableStreamCloseQueuedOrInFlight,\n  UnderlyingSink,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkAbortCallback\n};\n\n// Abstract operations for the WritableStream.\n\nfunction AcquireWritableStreamDefaultWriter<W>(stream: WritableStream<W>): WritableStreamDefaultWriter<W> {\n  return new WritableStreamDefaultWriter(stream);\n}\n\n// Throws if and only if startAlgorithm throws.\nfunction CreateWritableStream<W>(startAlgorithm: () => void | PromiseLike<void>,\n                                 writeAlgorithm: (chunk: W) => Promise<void>,\n                                 closeAlgorithm: () => Promise<void>,\n                                 abortAlgorithm: (reason: any) => Promise<void>,\n                                 highWaterMark = 1,\n                                 sizeAlgorithm: QueuingStrategySizeCallback<W> = () => 1) {\n  assert(IsNonNegativeNumber(highWaterMark));\n\n  const stream: WritableStream<W> = Object.create(WritableStream.prototype);\n  InitializeWritableStream(stream);\n\n  const controller: WritableStreamDefaultController<W> = Object.create(WritableStreamDefaultController.prototype);\n\n  SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm,\n                                       abortAlgorithm, highWaterMark, sizeAlgorithm);\n  return stream;\n}\n\nfunction InitializeWritableStream<W>(stream: WritableStream<W>) {\n  stream._state = 'writable';\n\n  // The error that will be reported by new method calls once the state becomes errored. Only set when [[state]] is\n  // 'erroring' or 'errored'. May be set to an undefined value.\n  stream._storedError = undefined;\n\n  stream._writer = undefined;\n\n  // Initialize to undefined first because the constructor of the controller checks this\n  // variable to validate the caller.\n  stream._writableStreamController = undefined!;\n\n  // This queue is placed here instead of the writer class in order to allow for passing a writer to the next data\n  // producer without waiting for the queued writes to finish.\n  stream._writeRequests = new SimpleQueue();\n\n  // Write requests are removed from _writeRequests when write() is called on the underlying sink. This prevents\n  // them from being erroneously rejected on error. If a write() call is in-flight, the request is stored here.\n  stream._inFlightWriteRequest = undefined;\n\n  // The promise that was returned from writer.close(). Stored here because it may be fulfilled after the writer\n  // has been detached.\n  stream._closeRequest = undefined;\n\n  // Close request is removed from _closeRequest when close() is called on the underlying sink. This prevents it\n  // from being erroneously rejected on error. If a close() call is in-flight, the request is stored here.\n  stream._inFlightCloseRequest = undefined;\n\n  // The promise that was returned from writer.abort(). This may also be fulfilled after the writer has detached.\n  stream._pendingAbortRequest = undefined;\n\n  // The backpressure signal set by the controller.\n  stream._backpressure = false;\n}\n\nfunction IsWritableStream(x: unknown): x is WritableStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_writableStreamController')) {\n    return false;\n  }\n\n  return x instanceof WritableStream;\n}\n\nfunction IsWritableStreamLocked(stream: WritableStream): boolean {\n  assert(IsWritableStream(stream));\n\n  if (stream._writer === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamAbort(stream: WritableStream, reason: any): Promise<undefined> {\n  if (stream._state === 'closed' || stream._state === 'errored') {\n    return promiseResolvedWith(undefined);\n  }\n  stream._writableStreamController._abortReason = reason;\n  stream._writableStreamController._abortController?.abort();\n\n  // TypeScript narrows the type of `stream._state` down to 'writable' | 'erroring',\n  // but it doesn't know that signaling abort runs author code that might have changed the state.\n  // Widen the type again by casting to WritableStreamState.\n  const state = stream._state as WritableStreamState;\n\n  if (state === 'closed' || state === 'errored') {\n    return promiseResolvedWith(undefined);\n  }\n  if (stream._pendingAbortRequest !== undefined) {\n    return stream._pendingAbortRequest._promise;\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n\n  let wasAlreadyErroring = false;\n  if (state === 'erroring') {\n    wasAlreadyErroring = true;\n    // reason will not be used, so don't keep a reference to it.\n    reason = undefined;\n  }\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    stream._pendingAbortRequest = {\n      _promise: undefined!,\n      _resolve: resolve,\n      _reject: reject,\n      _reason: reason,\n      _wasAlreadyErroring: wasAlreadyErroring\n    };\n  });\n  stream._pendingAbortRequest!._promise = promise;\n\n  if (!wasAlreadyErroring) {\n    WritableStreamStartErroring(stream, reason);\n  }\n\n  return promise;\n}\n\nfunction WritableStreamClose(stream: WritableStream<any>): Promise<undefined> {\n  const state = stream._state;\n  if (state === 'closed' || state === 'errored') {\n    return promiseRejectedWith(new TypeError(\n      `The stream (in ${state} state) is not in the writable state and cannot be closed`));\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n  assert(!WritableStreamCloseQueuedOrInFlight(stream));\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    const closeRequest: CloseRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._closeRequest = closeRequest;\n  });\n\n  const writer = stream._writer;\n  if (writer !== undefined && stream._backpressure && state === 'writable') {\n    defaultWriterReadyPromiseResolve(writer);\n  }\n\n  WritableStreamDefaultControllerClose(stream._writableStreamController);\n\n  return promise;\n}\n\n// WritableStream API exposed for controllers.\n\nfunction WritableStreamAddWriteRequest(stream: WritableStream): Promise<undefined> {\n  assert(IsWritableStreamLocked(stream));\n  assert(stream._state === 'writable');\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    const writeRequest: WriteRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._writeRequests.push(writeRequest);\n  });\n\n  return promise;\n}\n\nfunction WritableStreamDealWithRejection(stream: WritableStream, error: any) {\n  const state = stream._state;\n\n  if (state === 'writable') {\n    WritableStreamStartErroring(stream, error);\n    return;\n  }\n\n  assert(state === 'erroring');\n  WritableStreamFinishErroring(stream);\n}\n\nfunction WritableStreamStartErroring(stream: WritableStream, reason: any) {\n  assert(stream._storedError === undefined);\n  assert(stream._state === 'writable');\n\n  const controller = stream._writableStreamController;\n  assert(controller !== undefined);\n\n  stream._state = 'erroring';\n  stream._storedError = reason;\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);\n  }\n\n  if (!WritableStreamHasOperationMarkedInFlight(stream) && controller._started) {\n    WritableStreamFinishErroring(stream);\n  }\n}\n\nfunction WritableStreamFinishErroring(stream: WritableStream) {\n  assert(stream._state === 'erroring');\n  assert(!WritableStreamHasOperationMarkedInFlight(stream));\n  stream._state = 'errored';\n  stream._writableStreamController[ErrorSteps]();\n\n  const storedError = stream._storedError;\n  stream._writeRequests.forEach(writeRequest => {\n    writeRequest._reject(storedError);\n  });\n  stream._writeRequests = new SimpleQueue();\n\n  if (stream._pendingAbortRequest === undefined) {\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    return;\n  }\n\n  const abortRequest = stream._pendingAbortRequest;\n  stream._pendingAbortRequest = undefined;\n\n  if (abortRequest._wasAlreadyErroring) {\n    abortRequest._reject(storedError);\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    return;\n  }\n\n  const promise = stream._writableStreamController[AbortSteps](abortRequest._reason);\n  uponPromise(\n    promise,\n    () => {\n      abortRequest._resolve();\n      WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    },\n    (reason: any) => {\n      abortRequest._reject(reason);\n      WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    });\n}\n\nfunction WritableStreamFinishInFlightWrite(stream: WritableStream) {\n  assert(stream._inFlightWriteRequest !== undefined);\n  stream._inFlightWriteRequest!._resolve(undefined);\n  stream._inFlightWriteRequest = undefined;\n}\n\nfunction WritableStreamFinishInFlightWriteWithError(stream: WritableStream, error: any) {\n  assert(stream._inFlightWriteRequest !== undefined);\n  stream._inFlightWriteRequest!._reject(error);\n  stream._inFlightWriteRequest = undefined;\n\n  assert(stream._state === 'writable' || stream._state === 'erroring');\n\n  WritableStreamDealWithRejection(stream, error);\n}\n\nfunction WritableStreamFinishInFlightClose(stream: WritableStream) {\n  assert(stream._inFlightCloseRequest !== undefined);\n  stream._inFlightCloseRequest!._resolve(undefined);\n  stream._inFlightCloseRequest = undefined;\n\n  const state = stream._state;\n\n  assert(state === 'writable' || state === 'erroring');\n\n  if (state === 'erroring') {\n    // The error was too late to do anything, so it is ignored.\n    stream._storedError = undefined;\n    if (stream._pendingAbortRequest !== undefined) {\n      stream._pendingAbortRequest._resolve();\n      stream._pendingAbortRequest = undefined;\n    }\n  }\n\n  stream._state = 'closed';\n\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    defaultWriterClosedPromiseResolve(writer);\n  }\n\n  assert(stream._pendingAbortRequest === undefined);\n  assert(stream._storedError === undefined);\n}\n\nfunction WritableStreamFinishInFlightCloseWithError(stream: WritableStream, error: any) {\n  assert(stream._inFlightCloseRequest !== undefined);\n  stream._inFlightCloseRequest!._reject(error);\n  stream._inFlightCloseRequest = undefined;\n\n  assert(stream._state === 'writable' || stream._state === 'erroring');\n\n  // Never execute sink abort() after sink close().\n  if (stream._pendingAbortRequest !== undefined) {\n    stream._pendingAbortRequest._reject(error);\n    stream._pendingAbortRequest = undefined;\n  }\n  WritableStreamDealWithRejection(stream, error);\n}\n\n// TODO(ricea): Fix alphabetical order.\nfunction WritableStreamCloseQueuedOrInFlight(stream: WritableStream): boolean {\n  if (stream._closeRequest === undefined && stream._inFlightCloseRequest === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamHasOperationMarkedInFlight(stream: WritableStream): boolean {\n  if (stream._inFlightWriteRequest === undefined && stream._inFlightCloseRequest === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamMarkCloseRequestInFlight(stream: WritableStream) {\n  assert(stream._inFlightCloseRequest === undefined);\n  assert(stream._closeRequest !== undefined);\n  stream._inFlightCloseRequest = stream._closeRequest;\n  stream._closeRequest = undefined;\n}\n\nfunction WritableStreamMarkFirstWriteRequestInFlight(stream: WritableStream) {\n  assert(stream._inFlightWriteRequest === undefined);\n  assert(stream._writeRequests.length !== 0);\n  stream._inFlightWriteRequest = stream._writeRequests.shift();\n}\n\nfunction WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream: WritableStream) {\n  assert(stream._state === 'errored');\n  if (stream._closeRequest !== undefined) {\n    assert(stream._inFlightCloseRequest === undefined);\n\n    stream._closeRequest._reject(stream._storedError);\n    stream._closeRequest = undefined;\n  }\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    defaultWriterClosedPromiseReject(writer, stream._storedError);\n  }\n}\n\nfunction WritableStreamUpdateBackpressure(stream: WritableStream, backpressure: boolean) {\n  assert(stream._state === 'writable');\n  assert(!WritableStreamCloseQueuedOrInFlight(stream));\n\n  const writer = stream._writer;\n  if (writer !== undefined && backpressure !== stream._backpressure) {\n    if (backpressure) {\n      defaultWriterReadyPromiseReset(writer);\n    } else {\n      assert(!backpressure);\n\n      defaultWriterReadyPromiseResolve(writer);\n    }\n  }\n\n  stream._backpressure = backpressure;\n}\n\n/**\n * A default writer vended by a {@link WritableStream}.\n *\n * @public\n */\nexport class WritableStreamDefaultWriter<W = any> {\n  /** @internal */\n  _ownerWritableStream: WritableStream<W>;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _closedPromiseState!: 'pending' | 'resolved' | 'rejected';\n  /** @internal */\n  _readyPromise!: Promise<undefined>;\n  /** @internal */\n  _readyPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _readyPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readyPromiseState!: 'pending' | 'fulfilled' | 'rejected';\n\n  constructor(stream: WritableStream<W>) {\n    assertRequiredArgument(stream, 1, 'WritableStreamDefaultWriter');\n    assertWritableStream(stream, 'First parameter');\n\n    if (IsWritableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive writing by another writer');\n    }\n\n    this._ownerWritableStream = stream;\n    stream._writer = this;\n\n    const state = stream._state;\n\n    if (state === 'writable') {\n      if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._backpressure) {\n        defaultWriterReadyPromiseInitialize(this);\n      } else {\n        defaultWriterReadyPromiseInitializeAsResolved(this);\n      }\n\n      defaultWriterClosedPromiseInitialize(this);\n    } else if (state === 'erroring') {\n      defaultWriterReadyPromiseInitializeAsRejected(this, stream._storedError);\n      defaultWriterClosedPromiseInitialize(this);\n    } else if (state === 'closed') {\n      defaultWriterReadyPromiseInitializeAsResolved(this);\n      defaultWriterClosedPromiseInitializeAsResolved(this);\n    } else {\n      assert(state === 'errored');\n\n      const storedError = stream._storedError;\n      defaultWriterReadyPromiseInitializeAsRejected(this, storedError);\n      defaultWriterClosedPromiseInitializeAsRejected(this, storedError);\n    }\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or\n   * the writer’s lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * Returns the desired size to fill the stream’s internal queue. It can be negative, if the queue is over-full.\n   * A producer can use this information to determine the right amount of data to write.\n   *\n   * It will be `null` if the stream cannot be successfully written to (due to either being errored, or having an abort\n   * queued up). It will return zero if the stream is closed. And the getter will throw an exception if invoked when\n   * the writer’s lock is released.\n   */\n  get desiredSize(): number | null {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      throw defaultWriterBrandCheckException('desiredSize');\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      throw defaultWriterLockException('desiredSize');\n    }\n\n    return WritableStreamDefaultWriterGetDesiredSize(this);\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the desired size to fill the stream’s internal queue transitions\n   * from non-positive to positive, signaling that it is no longer applying backpressure. Once the desired size dips\n   * back to zero or below, the getter will return a new promise that stays pending until the next transition.\n   *\n   * If the stream becomes errored or aborted, or the writer’s lock is released, the returned promise will become\n   * rejected.\n   */\n  get ready(): Promise<undefined> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('ready'));\n    }\n\n    return this._readyPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link WritableStream.abort | stream.abort(reason)}.\n   */\n  abort(reason: any = undefined): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('abort'));\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('abort'));\n    }\n\n    return WritableStreamDefaultWriterAbort(this, reason);\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link WritableStream.close | stream.close()}.\n   */\n  close(): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('close'));\n    }\n\n    const stream = this._ownerWritableStream;\n\n    if (stream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('close'));\n    }\n\n    if (WritableStreamCloseQueuedOrInFlight(stream)) {\n      return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));\n    }\n\n    return WritableStreamDefaultWriterClose(this);\n  }\n\n  /**\n   * Releases the writer’s lock on the corresponding stream. After the lock is released, the writer is no longer active.\n   * If the associated stream is errored when the lock is released, the writer will appear errored in the same way from\n   * now on; otherwise, the writer will appear closed.\n   *\n   * Note that the lock can still be released even if some ongoing writes have not yet finished (i.e. even if the\n   * promises returned from previous calls to {@link WritableStreamDefaultWriter.write | write()} have not yet settled).\n   * It’s not necessary to hold the lock on the writer for the duration of the write; the lock instead simply prevents\n   * other producers from writing in an interleaved manner.\n   */\n  releaseLock(): void {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      throw defaultWriterBrandCheckException('releaseLock');\n    }\n\n    const stream = this._ownerWritableStream;\n\n    if (stream === undefined) {\n      return;\n    }\n\n    assert(stream._writer !== undefined);\n\n    WritableStreamDefaultWriterRelease(this);\n  }\n\n  /**\n   * Writes the given chunk to the writable stream, by waiting until any previous writes have finished successfully,\n   * and then sending the chunk to the underlying sink's {@link UnderlyingSink.write | write()} method. It will return\n   * a promise that fulfills with undefined upon a successful write, or rejects if the write fails or stream becomes\n   * errored before the writing process is initiated.\n   *\n   * Note that what \"success\" means is up to the underlying sink; it might indicate simply that the chunk has been\n   * accepted, and not necessarily that it is safely saved to its ultimate destination.\n   */\n  write(chunk: W): Promise<void>;\n  write(chunk: W = undefined!): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('write'));\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('write to'));\n    }\n\n    return WritableStreamDefaultWriterWrite(this, chunk);\n  }\n}\n\nObject.defineProperties(WritableStreamDefaultWriter.prototype, {\n  abort: { enumerable: true },\n  close: { enumerable: true },\n  releaseLock: { enumerable: true },\n  write: { enumerable: true },\n  closed: { enumerable: true },\n  desiredSize: { enumerable: true },\n  ready: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStreamDefaultWriter.prototype, Symbol.toStringTag, {\n    value: 'WritableStreamDefaultWriter',\n    configurable: true\n  });\n}\n\n// Abstract operations for the WritableStreamDefaultWriter.\n\nfunction IsWritableStreamDefaultWriter<W = any>(x: any): x is WritableStreamDefaultWriter<W> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) {\n    return false;\n  }\n\n  return x instanceof WritableStreamDefaultWriter;\n}\n\n// A client of WritableStreamDefaultWriter may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultWriterAbort(writer: WritableStreamDefaultWriter, reason: any) {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  return WritableStreamAbort(stream, reason);\n}\n\nfunction WritableStreamDefaultWriterClose(writer: WritableStreamDefaultWriter): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  return WritableStreamClose(stream);\n}\n\nfunction WritableStreamDefaultWriterCloseWithErrorPropagation(writer: WritableStreamDefaultWriter): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  const state = stream._state;\n  if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {\n    return promiseResolvedWith(undefined);\n  }\n\n  if (state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n\n  return WritableStreamDefaultWriterClose(writer);\n}\n\nfunction WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer: WritableStreamDefaultWriter, error: any) {\n  if (writer._closedPromiseState === 'pending') {\n    defaultWriterClosedPromiseReject(writer, error);\n  } else {\n    defaultWriterClosedPromiseResetToRejected(writer, error);\n  }\n}\n\nfunction WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer: WritableStreamDefaultWriter, error: any) {\n  if (writer._readyPromiseState === 'pending') {\n    defaultWriterReadyPromiseReject(writer, error);\n  } else {\n    defaultWriterReadyPromiseResetToRejected(writer, error);\n  }\n}\n\nfunction WritableStreamDefaultWriterGetDesiredSize(writer: WritableStreamDefaultWriter): number | null {\n  const stream = writer._ownerWritableStream;\n  const state = stream._state;\n\n  if (state === 'errored' || state === 'erroring') {\n    return null;\n  }\n\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return WritableStreamDefaultControllerGetDesiredSize(stream._writableStreamController);\n}\n\nfunction WritableStreamDefaultWriterRelease(writer: WritableStreamDefaultWriter) {\n  const stream = writer._ownerWritableStream;\n  assert(stream !== undefined);\n  assert(stream._writer === writer);\n\n  const releasedError = new TypeError(\n    `Writer was released and can no longer be used to monitor the stream's closedness`);\n\n  WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, releasedError);\n\n  // The state transitions to \"errored\" before the sink abort() method runs, but the writer.closed promise is not\n  // rejected until afterwards. This means that simply testing state will not work.\n  WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, releasedError);\n\n  stream._writer = undefined;\n  writer._ownerWritableStream = undefined!;\n}\n\nfunction WritableStreamDefaultWriterWrite<W>(writer: WritableStreamDefaultWriter<W>, chunk: W): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  const controller = stream._writableStreamController;\n\n  const chunkSize = WritableStreamDefaultControllerGetChunkSize(controller, chunk);\n\n  if (stream !== writer._ownerWritableStream) {\n    return promiseRejectedWith(defaultWriterLockException('write to'));\n  }\n\n  const state = stream._state;\n  if (state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n  if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {\n    return promiseRejectedWith(new TypeError('The stream is closing or closed and cannot be written to'));\n  }\n  if (state === 'erroring') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  assert(state === 'writable');\n\n  const promise = WritableStreamAddWriteRequest(stream);\n\n  WritableStreamDefaultControllerWrite(controller, chunk, chunkSize);\n\n  return promise;\n}\n\nconst closeSentinel: unique symbol = {} as any;\n\ntype QueueRecord<W> = W | typeof closeSentinel;\n\n/**\n * Allows control of a {@link WritableStream | writable stream}'s state and internal queue.\n *\n * @public\n */\nexport class WritableStreamDefaultController<W = any> {\n  /** @internal */\n  _controlledWritableStream!: WritableStream<W>;\n  /** @internal */\n  _queue!: SimpleQueue<QueuePair<QueueRecord<W>>>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _abortReason: any;\n  /** @internal */\n  _abortController: AbortController | undefined;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _strategySizeAlgorithm!: QueuingStrategySizeCallback<W>;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _writeAlgorithm!: (chunk: W) => Promise<void>;\n  /** @internal */\n  _closeAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _abortAlgorithm!: (reason: any) => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * The reason which was passed to `WritableStream.abort(reason)` when the stream was aborted.\n   *\n   * @deprecated\n   *  This property has been removed from the specification, see https://github.com/whatwg/streams/pull/1177.\n   *  Use {@link WritableStreamDefaultController.signal}'s `reason` instead.\n   */\n  get abortReason(): any {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('abortReason');\n    }\n    return this._abortReason;\n  }\n\n  /**\n   * An `AbortSignal` that can be used to abort the pending write or close operation when the stream is aborted.\n   */\n  get signal(): AbortSignal {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('signal');\n    }\n    if (this._abortController === undefined) {\n      // Older browsers or older Node versions may not support `AbortController` or `AbortSignal`.\n      // We don't want to bundle and ship an `AbortController` polyfill together with our polyfill,\n      // so instead we only implement support for `signal` if we find a global `AbortController` constructor.\n      throw new TypeError('WritableStreamDefaultController.prototype.signal is not supported');\n    }\n    return this._abortController.signal;\n  }\n\n  /**\n   * Closes the controlled writable stream, making all future interactions with it fail with the given error `e`.\n   *\n   * This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying\n   * sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the\n   * normal lifecycle of interactions with the underlying sink.\n   */\n  error(e: any = undefined): void {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n    const state = this._controlledWritableStream._state;\n    if (state !== 'writable') {\n      // The stream is closed, errored or will be soon. The sink can't do anything useful if it gets an error here, so\n      // just treat it as a no-op.\n      return;\n    }\n\n    WritableStreamDefaultControllerError(this, e);\n  }\n\n  /** @internal */\n  [AbortSteps](reason: any): Promise<void> {\n    const result = this._abortAlgorithm(reason);\n    WritableStreamDefaultControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [ErrorSteps]() {\n    ResetQueue(this);\n  }\n}\n\nObject.defineProperties(WritableStreamDefaultController.prototype, {\n  abortReason: { enumerable: true },\n  signal: { enumerable: true },\n  error: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'WritableStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Abstract operations implementing interface required by the WritableStream.\n\nfunction IsWritableStreamDefaultController(x: any): x is WritableStreamDefaultController<any> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledWritableStream')) {\n    return false;\n  }\n\n  return x instanceof WritableStreamDefaultController;\n}\n\nfunction SetUpWritableStreamDefaultController<W>(stream: WritableStream<W>,\n                                                 controller: WritableStreamDefaultController<W>,\n                                                 startAlgorithm: () => void | PromiseLike<void>,\n                                                 writeAlgorithm: (chunk: W) => Promise<void>,\n                                                 closeAlgorithm: () => Promise<void>,\n                                                 abortAlgorithm: (reason: any) => Promise<void>,\n                                                 highWaterMark: number,\n                                                 sizeAlgorithm: QueuingStrategySizeCallback<W>) {\n  assert(IsWritableStream(stream));\n  assert(stream._writableStreamController === undefined);\n\n  controller._controlledWritableStream = stream;\n  stream._writableStreamController = controller;\n\n  // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n  controller._queue = undefined!;\n  controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._abortReason = undefined;\n  controller._abortController = createAbortController();\n  controller._started = false;\n\n  controller._strategySizeAlgorithm = sizeAlgorithm;\n  controller._strategyHWM = highWaterMark;\n\n  controller._writeAlgorithm = writeAlgorithm;\n  controller._closeAlgorithm = closeAlgorithm;\n  controller._abortAlgorithm = abortAlgorithm;\n\n  const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n  WritableStreamUpdateBackpressure(stream, backpressure);\n\n  const startResult = startAlgorithm();\n  const startPromise = promiseResolvedWith(startResult);\n  uponPromise(\n    startPromise,\n    () => {\n      assert(stream._state === 'writable' || stream._state === 'erroring');\n      controller._started = true;\n      WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n    },\n    r => {\n      assert(stream._state === 'writable' || stream._state === 'erroring');\n      controller._started = true;\n      WritableStreamDealWithRejection(stream, r);\n    }\n  );\n}\n\nfunction SetUpWritableStreamDefaultControllerFromUnderlyingSink<W>(stream: WritableStream<W>,\n                                                                   underlyingSink: ValidatedUnderlyingSink<W>,\n                                                                   highWaterMark: number,\n                                                                   sizeAlgorithm: QueuingStrategySizeCallback<W>) {\n  const controller = Object.create(WritableStreamDefaultController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let writeAlgorithm: (chunk: W) => Promise<void> = () => promiseResolvedWith(undefined);\n  let closeAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let abortAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingSink.start !== undefined) {\n    startAlgorithm = () => underlyingSink.start!(controller);\n  }\n  if (underlyingSink.write !== undefined) {\n    writeAlgorithm = chunk => underlyingSink.write!(chunk, controller);\n  }\n  if (underlyingSink.close !== undefined) {\n    closeAlgorithm = () => underlyingSink.close!();\n  }\n  if (underlyingSink.abort !== undefined) {\n    abortAlgorithm = reason => underlyingSink.abort!(reason);\n  }\n\n  SetUpWritableStreamDefaultController(\n    stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm\n  );\n}\n\n// ClearAlgorithms may be called twice. Erroring the same stream in multiple ways will often result in redundant calls.\nfunction WritableStreamDefaultControllerClearAlgorithms(controller: WritableStreamDefaultController<any>) {\n  controller._writeAlgorithm = undefined!;\n  controller._closeAlgorithm = undefined!;\n  controller._abortAlgorithm = undefined!;\n  controller._strategySizeAlgorithm = undefined!;\n}\n\nfunction WritableStreamDefaultControllerClose<W>(controller: WritableStreamDefaultController<W>) {\n  EnqueueValueWithSize(controller, closeSentinel, 0);\n  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\nfunction WritableStreamDefaultControllerGetChunkSize<W>(controller: WritableStreamDefaultController<W>,\n                                                        chunk: W): number {\n  try {\n    return controller._strategySizeAlgorithm(chunk);\n  } catch (chunkSizeE) {\n    WritableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE);\n    return 1;\n  }\n}\n\nfunction WritableStreamDefaultControllerGetDesiredSize(controller: WritableStreamDefaultController<any>): number {\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\nfunction WritableStreamDefaultControllerWrite<W>(controller: WritableStreamDefaultController<W>,\n                                                 chunk: W,\n                                                 chunkSize: number) {\n  try {\n    EnqueueValueWithSize(controller, chunk, chunkSize);\n  } catch (enqueueE) {\n    WritableStreamDefaultControllerErrorIfNeeded(controller, enqueueE);\n    return;\n  }\n\n  const stream = controller._controlledWritableStream;\n  if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._state === 'writable') {\n    const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n    WritableStreamUpdateBackpressure(stream, backpressure);\n  }\n\n  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\n// Abstract operations for the WritableStreamDefaultController.\n\nfunction WritableStreamDefaultControllerAdvanceQueueIfNeeded<W>(controller: WritableStreamDefaultController<W>) {\n  const stream = controller._controlledWritableStream;\n\n  if (!controller._started) {\n    return;\n  }\n\n  if (stream._inFlightWriteRequest !== undefined) {\n    return;\n  }\n\n  const state = stream._state;\n  assert(state !== 'closed' && state !== 'errored');\n  if (state === 'erroring') {\n    WritableStreamFinishErroring(stream);\n    return;\n  }\n\n  if (controller._queue.length === 0) {\n    return;\n  }\n\n  const value = PeekQueueValue(controller);\n  if (value === closeSentinel) {\n    WritableStreamDefaultControllerProcessClose(controller);\n  } else {\n    WritableStreamDefaultControllerProcessWrite(controller, value);\n  }\n}\n\nfunction WritableStreamDefaultControllerErrorIfNeeded(controller: WritableStreamDefaultController<any>, error: any) {\n  if (controller._controlledWritableStream._state === 'writable') {\n    WritableStreamDefaultControllerError(controller, error);\n  }\n}\n\nfunction WritableStreamDefaultControllerProcessClose(controller: WritableStreamDefaultController<any>) {\n  const stream = controller._controlledWritableStream;\n\n  WritableStreamMarkCloseRequestInFlight(stream);\n\n  DequeueValue(controller);\n  assert(controller._queue.length === 0);\n\n  const sinkClosePromise = controller._closeAlgorithm();\n  WritableStreamDefaultControllerClearAlgorithms(controller);\n  uponPromise(\n    sinkClosePromise,\n    () => {\n      WritableStreamFinishInFlightClose(stream);\n    },\n    reason => {\n      WritableStreamFinishInFlightCloseWithError(stream, reason);\n    }\n  );\n}\n\nfunction WritableStreamDefaultControllerProcessWrite<W>(controller: WritableStreamDefaultController<W>, chunk: W) {\n  const stream = controller._controlledWritableStream;\n\n  WritableStreamMarkFirstWriteRequestInFlight(stream);\n\n  const sinkWritePromise = controller._writeAlgorithm(chunk);\n  uponPromise(\n    sinkWritePromise,\n    () => {\n      WritableStreamFinishInFlightWrite(stream);\n\n      const state = stream._state;\n      assert(state === 'writable' || state === 'erroring');\n\n      DequeueValue(controller);\n\n      if (!WritableStreamCloseQueuedOrInFlight(stream) && state === 'writable') {\n        const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n        WritableStreamUpdateBackpressure(stream, backpressure);\n      }\n\n      WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n    },\n    reason => {\n      if (stream._state === 'writable') {\n        WritableStreamDefaultControllerClearAlgorithms(controller);\n      }\n      WritableStreamFinishInFlightWriteWithError(stream, reason);\n    }\n  );\n}\n\nfunction WritableStreamDefaultControllerGetBackpressure(controller: WritableStreamDefaultController<any>): boolean {\n  const desiredSize = WritableStreamDefaultControllerGetDesiredSize(controller);\n  return desiredSize <= 0;\n}\n\n// A client of WritableStreamDefaultController may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultControllerError(controller: WritableStreamDefaultController<any>, error: any) {\n  const stream = controller._controlledWritableStream;\n\n  assert(stream._state === 'writable');\n\n  WritableStreamDefaultControllerClearAlgorithms(controller);\n  WritableStreamStartErroring(stream, error);\n}\n\n// Helper functions for the WritableStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(`WritableStream.prototype.${name} can only be used on a WritableStream`);\n}\n\n// Helper functions for the WritableStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `WritableStreamDefaultController.prototype.${name} can only be used on a WritableStreamDefaultController`);\n}\n\n\n// Helper functions for the WritableStreamDefaultWriter.\n\nfunction defaultWriterBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `WritableStreamDefaultWriter.prototype.${name} can only be used on a WritableStreamDefaultWriter`);\n}\n\nfunction defaultWriterLockException(name: string): TypeError {\n  return new TypeError('Cannot ' + name + ' a stream using a released writer');\n}\n\nfunction defaultWriterClosedPromiseInitialize(writer: WritableStreamDefaultWriter) {\n  writer._closedPromise = newPromise((resolve, reject) => {\n    writer._closedPromise_resolve = resolve;\n    writer._closedPromise_reject = reject;\n    writer._closedPromiseState = 'pending';\n  });\n}\n\nfunction defaultWriterClosedPromiseInitializeAsRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  defaultWriterClosedPromiseInitialize(writer);\n  defaultWriterClosedPromiseReject(writer, reason);\n}\n\nfunction defaultWriterClosedPromiseInitializeAsResolved(writer: WritableStreamDefaultWriter) {\n  defaultWriterClosedPromiseInitialize(writer);\n  defaultWriterClosedPromiseResolve(writer);\n}\n\nfunction defaultWriterClosedPromiseReject(writer: WritableStreamDefaultWriter, reason: any) {\n  if (writer._closedPromise_reject === undefined) {\n    return;\n  }\n  assert(writer._closedPromiseState === 'pending');\n\n  setPromiseIsHandledToTrue(writer._closedPromise);\n  writer._closedPromise_reject(reason);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'rejected';\n}\n\nfunction defaultWriterClosedPromiseResetToRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  assert(writer._closedPromise_resolve === undefined);\n  assert(writer._closedPromise_reject === undefined);\n  assert(writer._closedPromiseState !== 'pending');\n\n  defaultWriterClosedPromiseInitializeAsRejected(writer, reason);\n}\n\nfunction defaultWriterClosedPromiseResolve(writer: WritableStreamDefaultWriter) {\n  if (writer._closedPromise_resolve === undefined) {\n    return;\n  }\n  assert(writer._closedPromiseState === 'pending');\n\n  writer._closedPromise_resolve(undefined);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'resolved';\n}\n\nfunction defaultWriterReadyPromiseInitialize(writer: WritableStreamDefaultWriter) {\n  writer._readyPromise = newPromise((resolve, reject) => {\n    writer._readyPromise_resolve = resolve;\n    writer._readyPromise_reject = reject;\n  });\n  writer._readyPromiseState = 'pending';\n}\n\nfunction defaultWriterReadyPromiseInitializeAsRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  defaultWriterReadyPromiseInitialize(writer);\n  defaultWriterReadyPromiseReject(writer, reason);\n}\n\nfunction defaultWriterReadyPromiseInitializeAsResolved(writer: WritableStreamDefaultWriter) {\n  defaultWriterReadyPromiseInitialize(writer);\n  defaultWriterReadyPromiseResolve(writer);\n}\n\nfunction defaultWriterReadyPromiseReject(writer: WritableStreamDefaultWriter, reason: any) {\n  if (writer._readyPromise_reject === undefined) {\n    return;\n  }\n\n  setPromiseIsHandledToTrue(writer._readyPromise);\n  writer._readyPromise_reject(reason);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'rejected';\n}\n\nfunction defaultWriterReadyPromiseReset(writer: WritableStreamDefaultWriter) {\n  assert(writer._readyPromise_resolve === undefined);\n  assert(writer._readyPromise_reject === undefined);\n\n  defaultWriterReadyPromiseInitialize(writer);\n}\n\nfunction defaultWriterReadyPromiseResetToRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  assert(writer._readyPromise_resolve === undefined);\n  assert(writer._readyPromise_reject === undefined);\n\n  defaultWriterReadyPromiseInitializeAsRejected(writer, reason);\n}\n\nfunction defaultWriterReadyPromiseResolve(writer: WritableStreamDefaultWriter) {\n  if (writer._readyPromise_resolve === undefined) {\n    return;\n  }\n\n  writer._readyPromise_resolve(undefined);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'fulfilled';\n}\n","/// <reference lib=\"dom\" />\nexport const NativeDOMException: typeof DOMException | undefined =\n  typeof DOMException !== 'undefined' ? DOMException : undefined;\n","/// <reference types=\"node\" />\nimport { NativeDOMException } from './native';\n\ndeclare class DOMExceptionClass extends Error {\n  constructor(message?: string, name?: string);\n\n  name: string;\n  message: string;\n}\n\ntype DOMException = DOMExceptionClass;\ntype DOMExceptionConstructor = typeof DOMExceptionClass;\n\nfunction isDOMExceptionConstructor(ctor: unknown): ctor is DOMExceptionConstructor {\n  if (!(typeof ctor === 'function' || typeof ctor === 'object')) {\n    return false;\n  }\n  try {\n    new (ctor as DOMExceptionConstructor)();\n    return true;\n  } catch {\n    return false;\n  }\n}\n\nfunction createDOMExceptionPolyfill(): DOMExceptionConstructor {\n  // eslint-disable-next-line no-shadow\n  const ctor = function DOMException(this: DOMException, message?: string, name?: string) {\n    this.message = message || '';\n    this.name = name || 'Error';\n    if (Error.captureStackTrace) {\n      Error.captureStackTrace(this, this.constructor);\n    }\n  } as any;\n  ctor.prototype = Object.create(Error.prototype);\n  Object.defineProperty(ctor.prototype, 'constructor', { value: ctor, writable: true, configurable: true });\n  return ctor;\n}\n\n// eslint-disable-next-line no-redeclare\nconst DOMException: DOMExceptionConstructor =\n  isDOMExceptionConstructor(NativeDOMException) ? NativeDOMException : createDOMExceptionPolyfill();\n\nexport { DOMException };\n","import { IsReadableStream, IsReadableStreamLocked, ReadableStream, ReadableStreamCancel } from '../readable-stream';\nimport { AcquireReadableStreamDefaultReader, ReadableStreamDefaultReaderRead } from './default-reader';\nimport { ReadableStreamReaderGenericRelease } from './generic-reader';\nimport {\n  AcquireWritableStreamDefaultWriter,\n  IsWritableStream,\n  IsWritableStreamLocked,\n  WritableStream,\n  WritableStreamAbort,\n  WritableStreamCloseQueuedOrInFlight,\n  WritableStreamDefaultWriterCloseWithErrorPropagation,\n  WritableStreamDefaultWriterRelease,\n  WritableStreamDefaultWriterWrite\n} from '../writable-stream';\nimport assert from '../../stub/assert';\nimport {\n  newPromise,\n  PerformPromiseThen,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  uponFulfillment,\n  uponPromise,\n  uponRejection\n} from '../helpers/webidl';\nimport { noop } from '../../utils';\nimport { AbortSignal, isAbortSignal } from '../abort-signal';\nimport { DOMException } from '../../stub/dom-exception';\n\nexport function ReadableStreamPipeTo<T>(source: ReadableStream<T>,\n                                        dest: WritableStream<T>,\n                                        preventClose: boolean,\n                                        preventAbort: boolean,\n                                        preventCancel: boolean,\n                                        signal: AbortSignal | undefined): Promise<undefined> {\n  assert(IsReadableStream(source));\n  assert(IsWritableStream(dest));\n  assert(typeof preventClose === 'boolean');\n  assert(typeof preventAbort === 'boolean');\n  assert(typeof preventCancel === 'boolean');\n  assert(signal === undefined || isAbortSignal(signal));\n  assert(!IsReadableStreamLocked(source));\n  assert(!IsWritableStreamLocked(dest));\n\n  const reader = AcquireReadableStreamDefaultReader<T>(source);\n  const writer = AcquireWritableStreamDefaultWriter<T>(dest);\n\n  source._disturbed = true;\n\n  let shuttingDown = false;\n\n  // This is used to keep track of the spec's requirement that we wait for ongoing writes during shutdown.\n  let currentWrite = promiseResolvedWith<void>(undefined);\n\n  return newPromise((resolve, reject) => {\n    let abortAlgorithm: () => void;\n    if (signal !== undefined) {\n      abortAlgorithm = () => {\n        const error = new DOMException('Aborted', 'AbortError');\n        const actions: Array<() => Promise<void>> = [];\n        if (!preventAbort) {\n          actions.push(() => {\n            if (dest._state === 'writable') {\n              return WritableStreamAbort(dest, error);\n            }\n            return promiseResolvedWith(undefined);\n          });\n        }\n        if (!preventCancel) {\n          actions.push(() => {\n            if (source._state === 'readable') {\n              return ReadableStreamCancel(source, error);\n            }\n            return promiseResolvedWith(undefined);\n          });\n        }\n        shutdownWithAction(() => Promise.all(actions.map(action => action())), true, error);\n      };\n\n      if (signal.aborted) {\n        abortAlgorithm();\n        return;\n      }\n\n      signal.addEventListener('abort', abortAlgorithm);\n    }\n\n    // Using reader and writer, read all chunks from this and write them to dest\n    // - Backpressure must be enforced\n    // - Shutdown must stop all activity\n    function pipeLoop() {\n      return newPromise<void>((resolveLoop, rejectLoop) => {\n        function next(done: boolean) {\n          if (done) {\n            resolveLoop();\n          } else {\n            // Use `PerformPromiseThen` instead of `uponPromise` to avoid\n            // adding unnecessary `.catch(rethrowAssertionErrorRejection)` handlers\n            PerformPromiseThen(pipeStep(), next, rejectLoop);\n          }\n        }\n\n        next(false);\n      });\n    }\n\n    function pipeStep(): Promise<boolean> {\n      if (shuttingDown) {\n        return promiseResolvedWith(true);\n      }\n\n      return PerformPromiseThen(writer._readyPromise, () => {\n        return newPromise<boolean>((resolveRead, rejectRead) => {\n          ReadableStreamDefaultReaderRead(\n            reader,\n            {\n              _chunkSteps: chunk => {\n                currentWrite = PerformPromiseThen(WritableStreamDefaultWriterWrite(writer, chunk), undefined, noop);\n                resolveRead(false);\n              },\n              _closeSteps: () => resolveRead(true),\n              _errorSteps: rejectRead\n            }\n          );\n        });\n      });\n    }\n\n    // Errors must be propagated forward\n    isOrBecomesErrored(source, reader._closedPromise, storedError => {\n      if (!preventAbort) {\n        shutdownWithAction(() => WritableStreamAbort(dest, storedError), true, storedError);\n      } else {\n        shutdown(true, storedError);\n      }\n    });\n\n    // Errors must be propagated backward\n    isOrBecomesErrored(dest, writer._closedPromise, storedError => {\n      if (!preventCancel) {\n        shutdownWithAction(() => ReadableStreamCancel(source, storedError), true, storedError);\n      } else {\n        shutdown(true, storedError);\n      }\n    });\n\n    // Closing must be propagated forward\n    isOrBecomesClosed(source, reader._closedPromise, () => {\n      if (!preventClose) {\n        shutdownWithAction(() => WritableStreamDefaultWriterCloseWithErrorPropagation(writer));\n      } else {\n        shutdown();\n      }\n    });\n\n    // Closing must be propagated backward\n    if (WritableStreamCloseQueuedOrInFlight(dest) || dest._state === 'closed') {\n      const destClosed = new TypeError('the destination writable stream closed before all data could be piped to it');\n\n      if (!preventCancel) {\n        shutdownWithAction(() => ReadableStreamCancel(source, destClosed), true, destClosed);\n      } else {\n        shutdown(true, destClosed);\n      }\n    }\n\n    setPromiseIsHandledToTrue(pipeLoop());\n\n    function waitForWritesToFinish(): Promise<void> {\n      // Another write may have started while we were waiting on this currentWrite, so we have to be sure to wait\n      // for that too.\n      const oldCurrentWrite = currentWrite;\n      return PerformPromiseThen(\n        currentWrite,\n        () => oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined\n      );\n    }\n\n    function isOrBecomesErrored(stream: ReadableStream | WritableStream,\n                                promise: Promise<void>,\n                                action: (reason: any) => void) {\n      if (stream._state === 'errored') {\n        action(stream._storedError);\n      } else {\n        uponRejection(promise, action);\n      }\n    }\n\n    function isOrBecomesClosed(stream: ReadableStream | WritableStream, promise: Promise<void>, action: () => void) {\n      if (stream._state === 'closed') {\n        action();\n      } else {\n        uponFulfillment(promise, action);\n      }\n    }\n\n    function shutdownWithAction(action: () => Promise<unknown>, originalIsError?: boolean, originalError?: any) {\n      if (shuttingDown) {\n        return;\n      }\n      shuttingDown = true;\n\n      if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {\n        uponFulfillment(waitForWritesToFinish(), doTheRest);\n      } else {\n        doTheRest();\n      }\n\n      function doTheRest() {\n        uponPromise(\n          action(),\n          () => finalize(originalIsError, originalError),\n          newError => finalize(true, newError)\n        );\n      }\n    }\n\n    function shutdown(isError?: boolean, error?: any) {\n      if (shuttingDown) {\n        return;\n      }\n      shuttingDown = true;\n\n      if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {\n        uponFulfillment(waitForWritesToFinish(), () => finalize(isError, error));\n      } else {\n        finalize(isError, error);\n      }\n    }\n\n    function finalize(isError?: boolean, error?: any) {\n      WritableStreamDefaultWriterRelease(writer);\n      ReadableStreamReaderGenericRelease(reader);\n\n      if (signal !== undefined) {\n        signal.removeEventListener('abort', abortAlgorithm);\n      }\n      if (isError) {\n        reject(error);\n      } else {\n        resolve(undefined);\n      }\n    }\n  });\n}\n","import { QueuingStrategySizeCallback } from '../queuing-strategy';\nimport assert from '../../stub/assert';\nimport { DequeueValue, EnqueueValueWithSize, QueuePair, ResetQueue } from '../abstract-ops/queue-with-sizes';\nimport {\n  ReadableStreamAddReadRequest,\n  ReadableStreamFulfillReadRequest,\n  ReadableStreamGetNumReadRequests,\n  ReadRequest\n} from './default-reader';\nimport { SimpleQueue } from '../simple-queue';\nimport { IsReadableStreamLocked, ReadableStream, ReadableStreamClose, ReadableStreamError } from '../readable-stream';\nimport { ValidatedUnderlyingSource } from './underlying-source';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { CancelSteps, PullSteps } from '../abstract-ops/internal-methods';\nimport { promiseResolvedWith, uponPromise } from '../helpers/webidl';\n\n/**\n * Allows control of a {@link ReadableStream | readable stream}'s state and internal queue.\n *\n * @public\n */\nexport class ReadableStreamDefaultController<R> {\n  /** @internal */\n  _controlledReadableStream!: ReadableStream<R>;\n  /** @internal */\n  _queue!: SimpleQueue<QueuePair<R>>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _closeRequested!: boolean;\n  /** @internal */\n  _pullAgain!: boolean;\n  /** @internal */\n  _pulling !: boolean;\n  /** @internal */\n  _strategySizeAlgorithm!: QueuingStrategySizeCallback<R>;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _pullAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _cancelAlgorithm!: (reason: any) => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is\n   * over-full. An underlying source ought to use this information to determine when and how to apply backpressure.\n   */\n  get desiredSize(): number | null {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('desiredSize');\n    }\n\n    return ReadableStreamDefaultControllerGetDesiredSize(this);\n  }\n\n  /**\n   * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from\n   * the stream, but once those are read, the stream will become closed.\n   */\n  close(): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('close');\n    }\n\n    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {\n      throw new TypeError('The stream is not in a state that permits close');\n    }\n\n    ReadableStreamDefaultControllerClose(this);\n  }\n\n  /**\n   * Enqueues the given chunk `chunk` in the controlled readable stream.\n   */\n  enqueue(chunk: R): void;\n  enqueue(chunk: R = undefined!): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('enqueue');\n    }\n\n    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {\n      throw new TypeError('The stream is not in a state that permits enqueue');\n    }\n\n    return ReadableStreamDefaultControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.\n   */\n  error(e: any = undefined): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n\n    ReadableStreamDefaultControllerError(this, e);\n  }\n\n  /** @internal */\n  [CancelSteps](reason: any): Promise<void> {\n    ResetQueue(this);\n    const result = this._cancelAlgorithm(reason);\n    ReadableStreamDefaultControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [PullSteps](readRequest: ReadRequest<R>): void {\n    const stream = this._controlledReadableStream;\n\n    if (this._queue.length > 0) {\n      const chunk = DequeueValue(this);\n\n      if (this._closeRequested && this._queue.length === 0) {\n        ReadableStreamDefaultControllerClearAlgorithms(this);\n        ReadableStreamClose(stream);\n      } else {\n        ReadableStreamDefaultControllerCallPullIfNeeded(this);\n      }\n\n      readRequest._chunkSteps(chunk);\n    } else {\n      ReadableStreamAddReadRequest(stream, readRequest);\n      ReadableStreamDefaultControllerCallPullIfNeeded(this);\n    }\n  }\n}\n\nObject.defineProperties(ReadableStreamDefaultController.prototype, {\n  close: { enumerable: true },\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Abstract operations for the ReadableStreamDefaultController.\n\nfunction IsReadableStreamDefaultController<R = any>(x: any): x is ReadableStreamDefaultController<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableStream')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamDefaultController;\n}\n\nfunction ReadableStreamDefaultControllerCallPullIfNeeded(controller: ReadableStreamDefaultController<any>): void {\n  const shouldPull = ReadableStreamDefaultControllerShouldCallPull(controller);\n  if (!shouldPull) {\n    return;\n  }\n\n  if (controller._pulling) {\n    controller._pullAgain = true;\n    return;\n  }\n\n  assert(!controller._pullAgain);\n\n  controller._pulling = true;\n\n  const pullPromise = controller._pullAlgorithm();\n  uponPromise(\n    pullPromise,\n    () => {\n      controller._pulling = false;\n\n      if (controller._pullAgain) {\n        controller._pullAgain = false;\n        ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n      }\n    },\n    e => {\n      ReadableStreamDefaultControllerError(controller, e);\n    }\n  );\n}\n\nfunction ReadableStreamDefaultControllerShouldCallPull(controller: ReadableStreamDefaultController<any>): boolean {\n  const stream = controller._controlledReadableStream;\n\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return false;\n  }\n\n  if (!controller._started) {\n    return false;\n  }\n\n  if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    return true;\n  }\n\n  const desiredSize = ReadableStreamDefaultControllerGetDesiredSize(controller);\n  assert(desiredSize !== null);\n  if (desiredSize! > 0) {\n    return true;\n  }\n\n  return false;\n}\n\nfunction ReadableStreamDefaultControllerClearAlgorithms(controller: ReadableStreamDefaultController<any>) {\n  controller._pullAlgorithm = undefined!;\n  controller._cancelAlgorithm = undefined!;\n  controller._strategySizeAlgorithm = undefined!;\n}\n\n// A client of ReadableStreamDefaultController may use these functions directly to bypass state check.\n\nexport function ReadableStreamDefaultControllerClose(controller: ReadableStreamDefaultController<any>) {\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return;\n  }\n\n  const stream = controller._controlledReadableStream;\n\n  controller._closeRequested = true;\n\n  if (controller._queue.length === 0) {\n    ReadableStreamDefaultControllerClearAlgorithms(controller);\n    ReadableStreamClose(stream);\n  }\n}\n\nexport function ReadableStreamDefaultControllerEnqueue<R>(\n  controller: ReadableStreamDefaultController<R>,\n  chunk: R\n): void {\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return;\n  }\n\n  const stream = controller._controlledReadableStream;\n\n  if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    ReadableStreamFulfillReadRequest(stream, chunk, false);\n  } else {\n    let chunkSize;\n    try {\n      chunkSize = controller._strategySizeAlgorithm(chunk);\n    } catch (chunkSizeE) {\n      ReadableStreamDefaultControllerError(controller, chunkSizeE);\n      throw chunkSizeE;\n    }\n\n    try {\n      EnqueueValueWithSize(controller, chunk, chunkSize);\n    } catch (enqueueE) {\n      ReadableStreamDefaultControllerError(controller, enqueueE);\n      throw enqueueE;\n    }\n  }\n\n  ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n}\n\nexport function ReadableStreamDefaultControllerError(controller: ReadableStreamDefaultController<any>, e: any) {\n  const stream = controller._controlledReadableStream;\n\n  if (stream._state !== 'readable') {\n    return;\n  }\n\n  ResetQueue(controller);\n\n  ReadableStreamDefaultControllerClearAlgorithms(controller);\n  ReadableStreamError(stream, e);\n}\n\nexport function ReadableStreamDefaultControllerGetDesiredSize(\n  controller: ReadableStreamDefaultController<any>\n): number | null {\n  const state = controller._controlledReadableStream._state;\n\n  if (state === 'errored') {\n    return null;\n  }\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\n// This is used in the implementation of TransformStream.\nexport function ReadableStreamDefaultControllerHasBackpressure(\n  controller: ReadableStreamDefaultController<any>\n): boolean {\n  if (ReadableStreamDefaultControllerShouldCallPull(controller)) {\n    return false;\n  }\n\n  return true;\n}\n\nexport function ReadableStreamDefaultControllerCanCloseOrEnqueue(\n  controller: ReadableStreamDefaultController<any>\n): boolean {\n  const state = controller._controlledReadableStream._state;\n\n  if (!controller._closeRequested && state === 'readable') {\n    return true;\n  }\n\n  return false;\n}\n\nexport function SetUpReadableStreamDefaultController<R>(stream: ReadableStream<R>,\n                                                        controller: ReadableStreamDefaultController<R>,\n                                                        startAlgorithm: () => void | PromiseLike<void>,\n                                                        pullAlgorithm: () => Promise<void>,\n                                                        cancelAlgorithm: (reason: any) => Promise<void>,\n                                                        highWaterMark: number,\n                                                        sizeAlgorithm: QueuingStrategySizeCallback<R>) {\n  assert(stream._readableStreamController === undefined);\n\n  controller._controlledReadableStream = stream;\n\n  controller._queue = undefined!;\n  controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._started = false;\n  controller._closeRequested = false;\n  controller._pullAgain = false;\n  controller._pulling = false;\n\n  controller._strategySizeAlgorithm = sizeAlgorithm;\n  controller._strategyHWM = highWaterMark;\n\n  controller._pullAlgorithm = pullAlgorithm;\n  controller._cancelAlgorithm = cancelAlgorithm;\n\n  stream._readableStreamController = controller;\n\n  const startResult = startAlgorithm();\n  uponPromise(\n    promiseResolvedWith(startResult),\n    () => {\n      controller._started = true;\n\n      assert(!controller._pulling);\n      assert(!controller._pullAgain);\n\n      ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n    },\n    r => {\n      ReadableStreamDefaultControllerError(controller, r);\n    }\n  );\n}\n\nexport function SetUpReadableStreamDefaultControllerFromUnderlyingSource<R>(\n  stream: ReadableStream<R>,\n  underlyingSource: ValidatedUnderlyingSource<R>,\n  highWaterMark: number,\n  sizeAlgorithm: QueuingStrategySizeCallback<R>\n) {\n  const controller: ReadableStreamDefaultController<R> = Object.create(ReadableStreamDefaultController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let pullAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let cancelAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingSource.start !== undefined) {\n    startAlgorithm = () => underlyingSource.start!(controller);\n  }\n  if (underlyingSource.pull !== undefined) {\n    pullAlgorithm = () => underlyingSource.pull!(controller);\n  }\n  if (underlyingSource.cancel !== undefined) {\n    cancelAlgorithm = reason => underlyingSource.cancel!(reason);\n  }\n\n  SetUpReadableStreamDefaultController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm\n  );\n}\n\n// Helper functions for the ReadableStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamDefaultController.prototype.${name} can only be used on a ReadableStreamDefaultController`);\n}\n","import {\n  CreateReadableByteStream,\n  CreateReadableStream,\n  IsReadableStream,\n  ReadableByteStream,\n  ReadableStream,\n  ReadableStreamCancel,\n  ReadableStreamReader\n} from '../readable-stream';\nimport { ReadableStreamReaderGenericRelease } from './generic-reader';\nimport {\n  AcquireReadableStreamDefaultReader,\n  IsReadableStreamDefaultReader,\n  ReadableStreamDefaultReaderRead,\n  ReadRequest\n} from './default-reader';\nimport {\n  AcquireReadableStreamBYOBReader,\n  IsReadableStreamBYOBReader,\n  ReadableStreamBYOBReaderRead,\n  ReadIntoRequest\n} from './byob-reader';\nimport assert from '../../stub/assert';\nimport { newPromise, promiseResolvedWith, queueMicrotask, uponRejection } from '../helpers/webidl';\nimport {\n  ReadableStreamDefaultController,\n  ReadableStreamDefaultControllerClose,\n  ReadableStreamDefaultControllerEnqueue,\n  ReadableStreamDefaultControllerError\n} from './default-controller';\nimport {\n  IsReadableByteStreamController,\n  ReadableByteStreamControllerClose,\n  ReadableByteStreamControllerEnqueue,\n  ReadableByteStreamControllerError,\n  ReadableByteStreamControllerGetBYOBRequest,\n  ReadableByteStreamControllerRespond,\n  ReadableByteStreamControllerRespondWithNewView\n} from './byte-stream-controller';\nimport { CreateArrayFromList } from '../abstract-ops/ecmascript';\nimport { CloneAsUint8Array } from '../abstract-ops/miscellaneous';\n\nexport function ReadableStreamTee<R>(stream: ReadableStream<R>,\n                                     cloneForBranch2: boolean): [ReadableStream<R>, ReadableStream<R>] {\n  assert(IsReadableStream(stream));\n  assert(typeof cloneForBranch2 === 'boolean');\n  if (IsReadableByteStreamController(stream._readableStreamController)) {\n    return ReadableByteStreamTee(stream as unknown as ReadableByteStream) as\n      unknown as [ReadableStream<R>, ReadableStream<R>];\n  }\n  return ReadableStreamDefaultTee(stream, cloneForBranch2);\n}\n\nexport function ReadableStreamDefaultTee<R>(stream: ReadableStream<R>,\n                                            cloneForBranch2: boolean): [ReadableStream<R>, ReadableStream<R>] {\n  assert(IsReadableStream(stream));\n  assert(typeof cloneForBranch2 === 'boolean');\n\n  const reader = AcquireReadableStreamDefaultReader<R>(stream);\n\n  let reading = false;\n  let readAgain = false;\n  let canceled1 = false;\n  let canceled2 = false;\n  let reason1: any;\n  let reason2: any;\n  let branch1: ReadableStream<R>;\n  let branch2: ReadableStream<R>;\n\n  let resolveCancelPromise: (value: undefined | Promise<undefined>) => void;\n  const cancelPromise = newPromise<undefined>(resolve => {\n    resolveCancelPromise = resolve;\n  });\n\n  function pullAlgorithm(): Promise<void> {\n    if (reading) {\n      readAgain = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgain = false;\n          const chunk1 = chunk;\n          const chunk2 = chunk;\n\n          // There is no way to access the cloning code right now in the reference implementation.\n          // If we add one then we'll need an implementation for serializable objects.\n          // if (!canceled2 && cloneForBranch2) {\n          //   chunk2 = StructuredDeserialize(StructuredSerialize(chunk2));\n          // }\n\n          if (!canceled1) {\n            ReadableStreamDefaultControllerEnqueue(\n              branch1._readableStreamController as ReadableStreamDefaultController<R>,\n              chunk1\n            );\n          }\n          if (!canceled2) {\n            ReadableStreamDefaultControllerEnqueue(\n              branch2._readableStreamController as ReadableStreamDefaultController<R>,\n              chunk2\n            );\n          }\n\n          reading = false;\n          if (readAgain) {\n            pullAlgorithm();\n          }\n        });\n      },\n      _closeSteps: () => {\n        reading = false;\n        if (!canceled1) {\n          ReadableStreamDefaultControllerClose(branch1._readableStreamController as ReadableStreamDefaultController<R>);\n        }\n        if (!canceled2) {\n          ReadableStreamDefaultControllerClose(branch2._readableStreamController as ReadableStreamDefaultController<R>);\n        }\n\n        if (!canceled1 || !canceled2) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function cancel1Algorithm(reason: any): Promise<void> {\n    canceled1 = true;\n    reason1 = reason;\n    if (canceled2) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function cancel2Algorithm(reason: any): Promise<void> {\n    canceled2 = true;\n    reason2 = reason;\n    if (canceled1) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function startAlgorithm() {\n    // do nothing\n  }\n\n  branch1 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel1Algorithm);\n  branch2 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel2Algorithm);\n\n  uponRejection(reader._closedPromise, (r: any) => {\n    ReadableStreamDefaultControllerError(branch1._readableStreamController as ReadableStreamDefaultController<R>, r);\n    ReadableStreamDefaultControllerError(branch2._readableStreamController as ReadableStreamDefaultController<R>, r);\n    if (!canceled1 || !canceled2) {\n      resolveCancelPromise(undefined);\n    }\n  });\n\n  return [branch1, branch2];\n}\n\nexport function ReadableByteStreamTee(stream: ReadableByteStream): [ReadableByteStream, ReadableByteStream] {\n  assert(IsReadableStream(stream));\n  assert(IsReadableByteStreamController(stream._readableStreamController));\n\n  let reader: ReadableStreamReader<Uint8Array> = AcquireReadableStreamDefaultReader(stream);\n  let reading = false;\n  let readAgainForBranch1 = false;\n  let readAgainForBranch2 = false;\n  let canceled1 = false;\n  let canceled2 = false;\n  let reason1: any;\n  let reason2: any;\n  let branch1: ReadableByteStream;\n  let branch2: ReadableByteStream;\n\n  let resolveCancelPromise: (value: undefined | Promise<undefined>) => void;\n  const cancelPromise = newPromise<void>(resolve => {\n    resolveCancelPromise = resolve;\n  });\n\n  function forwardReaderError(thisReader: ReadableStreamReader<Uint8Array>) {\n    uponRejection(thisReader._closedPromise, r => {\n      if (thisReader !== reader) {\n        return;\n      }\n      ReadableByteStreamControllerError(branch1._readableStreamController, r);\n      ReadableByteStreamControllerError(branch2._readableStreamController, r);\n      if (!canceled1 || !canceled2) {\n        resolveCancelPromise(undefined);\n      }\n    });\n  }\n\n  function pullWithDefaultReader() {\n    if (IsReadableStreamBYOBReader(reader)) {\n      assert(reader._readIntoRequests.length === 0);\n      ReadableStreamReaderGenericRelease(reader);\n\n      reader = AcquireReadableStreamDefaultReader(stream);\n      forwardReaderError(reader);\n    }\n\n    const readRequest: ReadRequest<Uint8Array> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgainForBranch1 = false;\n          readAgainForBranch2 = false;\n\n          const chunk1 = chunk;\n          let chunk2 = chunk;\n          if (!canceled1 && !canceled2) {\n            try {\n              chunk2 = CloneAsUint8Array(chunk);\n            } catch (cloneE) {\n              ReadableByteStreamControllerError(branch1._readableStreamController, cloneE);\n              ReadableByteStreamControllerError(branch2._readableStreamController, cloneE);\n              resolveCancelPromise(ReadableStreamCancel(stream, cloneE));\n              return;\n            }\n          }\n\n          if (!canceled1) {\n            ReadableByteStreamControllerEnqueue(branch1._readableStreamController, chunk1);\n          }\n          if (!canceled2) {\n            ReadableByteStreamControllerEnqueue(branch2._readableStreamController, chunk2);\n          }\n\n          reading = false;\n          if (readAgainForBranch1) {\n            pull1Algorithm();\n          } else if (readAgainForBranch2) {\n            pull2Algorithm();\n          }\n        });\n      },\n      _closeSteps: () => {\n        reading = false;\n        if (!canceled1) {\n          ReadableByteStreamControllerClose(branch1._readableStreamController);\n        }\n        if (!canceled2) {\n          ReadableByteStreamControllerClose(branch2._readableStreamController);\n        }\n        if (branch1._readableStreamController._pendingPullIntos.length > 0) {\n          ReadableByteStreamControllerRespond(branch1._readableStreamController, 0);\n        }\n        if (branch2._readableStreamController._pendingPullIntos.length > 0) {\n          ReadableByteStreamControllerRespond(branch2._readableStreamController, 0);\n        }\n        if (!canceled1 || !canceled2) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n  }\n\n  function pullWithBYOBReader(view: ArrayBufferView, forBranch2: boolean) {\n    if (IsReadableStreamDefaultReader<Uint8Array>(reader)) {\n      assert(reader._readRequests.length === 0);\n      ReadableStreamReaderGenericRelease(reader);\n\n      reader = AcquireReadableStreamBYOBReader(stream);\n      forwardReaderError(reader);\n    }\n\n    const byobBranch = forBranch2 ? branch2 : branch1;\n    const otherBranch = forBranch2 ? branch1 : branch2;\n\n    const readIntoRequest: ReadIntoRequest<ArrayBufferView> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgainForBranch1 = false;\n          readAgainForBranch2 = false;\n\n          const byobCanceled = forBranch2 ? canceled2 : canceled1;\n          const otherCanceled = forBranch2 ? canceled1 : canceled2;\n\n          if (!otherCanceled) {\n            let clonedChunk;\n            try {\n              clonedChunk = CloneAsUint8Array(chunk);\n            } catch (cloneE) {\n              ReadableByteStreamControllerError(byobBranch._readableStreamController, cloneE);\n              ReadableByteStreamControllerError(otherBranch._readableStreamController, cloneE);\n              resolveCancelPromise(ReadableStreamCancel(stream, cloneE));\n              return;\n            }\n            if (!byobCanceled) {\n              ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n            }\n            ReadableByteStreamControllerEnqueue(otherBranch._readableStreamController, clonedChunk);\n          } else if (!byobCanceled) {\n            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n          }\n\n          reading = false;\n          if (readAgainForBranch1) {\n            pull1Algorithm();\n          } else if (readAgainForBranch2) {\n            pull2Algorithm();\n          }\n        });\n      },\n      _closeSteps: chunk => {\n        reading = false;\n\n        const byobCanceled = forBranch2 ? canceled2 : canceled1;\n        const otherCanceled = forBranch2 ? canceled1 : canceled2;\n\n        if (!byobCanceled) {\n          ReadableByteStreamControllerClose(byobBranch._readableStreamController);\n        }\n        if (!otherCanceled) {\n          ReadableByteStreamControllerClose(otherBranch._readableStreamController);\n        }\n\n        if (chunk !== undefined) {\n          assert(chunk.byteLength === 0);\n\n          if (!byobCanceled) {\n            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n          }\n          if (!otherCanceled && otherBranch._readableStreamController._pendingPullIntos.length > 0) {\n            ReadableByteStreamControllerRespond(otherBranch._readableStreamController, 0);\n          }\n        }\n\n        if (!byobCanceled || !otherCanceled) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamBYOBReaderRead(reader, view, readIntoRequest);\n  }\n\n  function pull1Algorithm(): Promise<void> {\n    if (reading) {\n      readAgainForBranch1 = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch1._readableStreamController);\n    if (byobRequest === null) {\n      pullWithDefaultReader();\n    } else {\n      pullWithBYOBReader(byobRequest._view!, false);\n    }\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function pull2Algorithm(): Promise<void> {\n    if (reading) {\n      readAgainForBranch2 = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch2._readableStreamController);\n    if (byobRequest === null) {\n      pullWithDefaultReader();\n    } else {\n      pullWithBYOBReader(byobRequest._view!, true);\n    }\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function cancel1Algorithm(reason: any): Promise<void> {\n    canceled1 = true;\n    reason1 = reason;\n    if (canceled2) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function cancel2Algorithm(reason: any): Promise<void> {\n    canceled2 = true;\n    reason2 = reason;\n    if (canceled1) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function startAlgorithm(): void {\n    return;\n  }\n\n  branch1 = CreateReadableByteStream(startAlgorithm, pull1Algorithm, cancel1Algorithm);\n  branch2 = CreateReadableByteStream(startAlgorithm, pull2Algorithm, cancel2Algorithm);\n\n  forwardReaderError(reader);\n\n  return [branch1, branch2];\n}\n","import { assertDictionary, assertFunction, convertUnsignedLongLongWithEnforceRange } from './basic';\nimport {\n  ReadableStreamController,\n  UnderlyingByteSource,\n  UnderlyingDefaultOrByteSource,\n  UnderlyingDefaultOrByteSourcePullCallback,\n  UnderlyingDefaultOrByteSourceStartCallback,\n  UnderlyingSource,\n  UnderlyingSourceCancelCallback,\n  ValidatedUnderlyingDefaultOrByteSource\n} from '../readable-stream/underlying-source';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\n\nexport function convertUnderlyingDefaultOrByteSource<R>(\n  source: UnderlyingSource<R> | UnderlyingByteSource | null,\n  context: string\n): ValidatedUnderlyingDefaultOrByteSource<R> {\n  assertDictionary(source, context);\n  const original = source as (UnderlyingDefaultOrByteSource<R> | null);\n  const autoAllocateChunkSize = original?.autoAllocateChunkSize;\n  const cancel = original?.cancel;\n  const pull = original?.pull;\n  const start = original?.start;\n  const type = original?.type;\n  return {\n    autoAllocateChunkSize: autoAllocateChunkSize === undefined ?\n      undefined :\n      convertUnsignedLongLongWithEnforceRange(\n        autoAllocateChunkSize,\n        `${context} has member 'autoAllocateChunkSize' that`\n      ),\n    cancel: cancel === undefined ?\n      undefined :\n      convertUnderlyingSourceCancelCallback(cancel, original!, `${context} has member 'cancel' that`),\n    pull: pull === undefined ?\n      undefined :\n      convertUnderlyingSourcePullCallback(pull, original!, `${context} has member 'pull' that`),\n    start: start === undefined ?\n      undefined :\n      convertUnderlyingSourceStartCallback(start, original!, `${context} has member 'start' that`),\n    type: type === undefined ? undefined : convertReadableStreamType(type, `${context} has member 'type' that`)\n  };\n}\n\nfunction convertUnderlyingSourceCancelCallback(\n  fn: UnderlyingSourceCancelCallback,\n  original: UnderlyingDefaultOrByteSource,\n  context: string\n): (reason: any) => Promise<void> {\n  assertFunction(fn, context);\n  return (reason: any) => promiseCall(fn, original, [reason]);\n}\n\nfunction convertUnderlyingSourcePullCallback<R>(\n  fn: UnderlyingDefaultOrByteSourcePullCallback<R>,\n  original: UnderlyingDefaultOrByteSource<R>,\n  context: string\n): (controller: ReadableStreamController<R>) => Promise<void> {\n  assertFunction(fn, context);\n  return (controller: ReadableStreamController<R>) => promiseCall(fn, original, [controller]);\n}\n\nfunction convertUnderlyingSourceStartCallback<R>(\n  fn: UnderlyingDefaultOrByteSourceStartCallback<R>,\n  original: UnderlyingDefaultOrByteSource<R>,\n  context: string\n): UnderlyingDefaultOrByteSourceStartCallback<R> {\n  assertFunction(fn, context);\n  return (controller: ReadableStreamController<R>) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertReadableStreamType(type: string, context: string): 'bytes' {\n  type = `${type}`;\n  if (type !== 'bytes') {\n    throw new TypeError(`${context} '${type}' is not a valid enumeration value for ReadableStreamType`);\n  }\n  return type;\n}\n","import { assertDictionary } from './basic';\nimport { ReadableStreamGetReaderOptions } from '../readable-stream/reader-options';\n\nexport function convertReaderOptions(options: ReadableStreamGetReaderOptions | null | undefined,\n                                     context: string): ReadableStreamGetReaderOptions {\n  assertDictionary(options, context);\n  const mode = options?.mode;\n  return {\n    mode: mode === undefined ? undefined : convertReadableStreamReaderMode(mode, `${context} has member 'mode' that`)\n  };\n}\n\nfunction convertReadableStreamReaderMode(mode: string, context: string): 'byob' {\n  mode = `${mode}`;\n  if (mode !== 'byob') {\n    throw new TypeError(`${context} '${mode}' is not a valid enumeration value for ReadableStreamReaderMode`);\n  }\n  return mode;\n}\n","import { assertDictionary } from './basic';\nimport { StreamPipeOptions, ValidatedStreamPipeOptions } from '../readable-stream/pipe-options';\nimport { AbortSignal, isAbortSignal } from '../abort-signal';\n\nexport function convertPipeOptions(options: StreamPipeOptions | null | undefined,\n                                   context: string): ValidatedStreamPipeOptions {\n  assertDictionary(options, context);\n  const preventAbort = options?.preventAbort;\n  const preventCancel = options?.preventCancel;\n  const preventClose = options?.preventClose;\n  const signal = options?.signal;\n  if (signal !== undefined) {\n    assertAbortSignal(signal, `${context} has member 'signal' that`);\n  }\n  return {\n    preventAbort: Boolean(preventAbort),\n    preventCancel: Boolean(preventCancel),\n    preventClose: Boolean(preventClose),\n    signal\n  };\n}\n\nfunction assertAbortSignal(signal: unknown, context: string): asserts signal is AbortSignal {\n  if (!isAbortSignal(signal)) {\n    throw new TypeError(`${context} is not an AbortSignal.`);\n  }\n}\n","import assert from '../stub/assert';\nimport {\n  promiseRejectedWith,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  transformPromiseWith\n} from './helpers/webidl';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { AcquireReadableStreamAsyncIterator, ReadableStreamAsyncIterator } from './readable-stream/async-iterator';\nimport { defaultReaderClosedPromiseReject, defaultReaderClosedPromiseResolve } from './readable-stream/generic-reader';\nimport {\n  AcquireReadableStreamDefaultReader,\n  IsReadableStreamDefaultReader,\n  ReadableStreamDefaultReader,\n  ReadableStreamDefaultReadResult\n} from './readable-stream/default-reader';\nimport {\n  AcquireReadableStreamBYOBReader,\n  IsReadableStreamBYOBReader,\n  ReadableStreamBYOBReader,\n  ReadableStreamBYOBReadResult\n} from './readable-stream/byob-reader';\nimport { ReadableStreamPipeTo } from './readable-stream/pipe';\nimport { ReadableStreamTee } from './readable-stream/tee';\nimport { IsWritableStream, IsWritableStreamLocked, WritableStream } from './writable-stream';\nimport { SimpleQueue } from './simple-queue';\nimport {\n  ReadableByteStreamController,\n  ReadableStreamBYOBRequest,\n  SetUpReadableByteStreamController,\n  SetUpReadableByteStreamControllerFromUnderlyingSource\n} from './readable-stream/byte-stream-controller';\nimport {\n  ReadableStreamDefaultController,\n  SetUpReadableStreamDefaultController,\n  SetUpReadableStreamDefaultControllerFromUnderlyingSource\n} from './readable-stream/default-controller';\nimport {\n  UnderlyingByteSource,\n  UnderlyingByteSourcePullCallback,\n  UnderlyingByteSourceStartCallback,\n  UnderlyingSource,\n  UnderlyingSourceCancelCallback,\n  UnderlyingSourcePullCallback,\n  UnderlyingSourceStartCallback\n} from './readable-stream/underlying-source';\nimport { noop } from '../utils';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { CreateArrayFromList } from './abstract-ops/ecmascript';\nimport { CancelSteps } from './abstract-ops/internal-methods';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { assertObject, assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport { convertUnderlyingDefaultOrByteSource } from './validators/underlying-source';\nimport { ReadableStreamGetReaderOptions } from './readable-stream/reader-options';\nimport { convertReaderOptions } from './validators/reader-options';\nimport { StreamPipeOptions, ValidatedStreamPipeOptions } from './readable-stream/pipe-options';\nimport { ReadableStreamIteratorOptions } from './readable-stream/iterator-options';\nimport { convertIteratorOptions } from './validators/iterator-options';\nimport { convertPipeOptions } from './validators/pipe-options';\nimport { ReadableWritablePair } from './readable-stream/readable-writable-pair';\nimport { convertReadableWritablePair } from './validators/readable-writable-pair';\n\nexport type ReadableByteStream = ReadableStream<Uint8Array> & {\n  _readableStreamController: ReadableByteStreamController\n};\n\ntype ReadableStreamState = 'readable' | 'closed' | 'errored';\n\n/**\n * A readable stream represents a source of data, from which you can read.\n *\n * @public\n */\nexport class ReadableStream<R = any> {\n  /** @internal */\n  _state!: ReadableStreamState;\n  /** @internal */\n  _reader: ReadableStreamReader<R> | undefined;\n  /** @internal */\n  _storedError: any;\n  /** @internal */\n  _disturbed!: boolean;\n  /** @internal */\n  _readableStreamController!: ReadableStreamDefaultController<R> | ReadableByteStreamController;\n\n  constructor(underlyingSource: UnderlyingByteSource, strategy?: { highWaterMark?: number; size?: undefined });\n  constructor(underlyingSource?: UnderlyingSource<R>, strategy?: QueuingStrategy<R>);\n  constructor(rawUnderlyingSource: UnderlyingSource<R> | UnderlyingByteSource | null | undefined = {},\n              rawStrategy: QueuingStrategy<R> | null | undefined = {}) {\n    if (rawUnderlyingSource === undefined) {\n      rawUnderlyingSource = null;\n    } else {\n      assertObject(rawUnderlyingSource, 'First parameter');\n    }\n\n    const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');\n    const underlyingSource = convertUnderlyingDefaultOrByteSource(rawUnderlyingSource, 'First parameter');\n\n    InitializeReadableStream(this);\n\n    if (underlyingSource.type === 'bytes') {\n      if (strategy.size !== undefined) {\n        throw new RangeError('The strategy for a byte stream cannot have a size function');\n      }\n      const highWaterMark = ExtractHighWaterMark(strategy, 0);\n      SetUpReadableByteStreamControllerFromUnderlyingSource(\n        this as unknown as ReadableByteStream,\n        underlyingSource,\n        highWaterMark\n      );\n    } else {\n      assert(underlyingSource.type === undefined);\n      const sizeAlgorithm = ExtractSizeAlgorithm(strategy);\n      const highWaterMark = ExtractHighWaterMark(strategy, 1);\n      SetUpReadableStreamDefaultControllerFromUnderlyingSource(\n        this,\n        underlyingSource,\n        highWaterMark,\n        sizeAlgorithm\n      );\n    }\n  }\n\n  /**\n   * Whether or not the readable stream is locked to a {@link ReadableStreamDefaultReader | reader}.\n   */\n  get locked(): boolean {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('locked');\n    }\n\n    return IsReadableStreamLocked(this);\n  }\n\n  /**\n   * Cancels the stream, signaling a loss of interest in the stream by a consumer.\n   *\n   * The supplied `reason` argument will be given to the underlying source's {@link UnderlyingSource.cancel | cancel()}\n   * method, which might or might not use it.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('cancel'));\n    }\n\n    if (IsReadableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot cancel a stream that already has a reader'));\n    }\n\n    return ReadableStreamCancel(this, reason);\n  }\n\n  /**\n   * Creates a {@link ReadableStreamBYOBReader} and locks the stream to the new reader.\n   *\n   * This call behaves the same way as the no-argument variant, except that it only works on readable byte streams,\n   * i.e. streams which were constructed specifically with the ability to handle \"bring your own buffer\" reading.\n   * The returned BYOB reader provides the ability to directly read individual chunks from the stream via its\n   * {@link ReadableStreamBYOBReader.read | read()} method, into developer-supplied buffers, allowing more precise\n   * control over allocation.\n   */\n  getReader({ mode }: { mode: 'byob' }): ReadableStreamBYOBReader;\n  /**\n   * Creates a {@link ReadableStreamDefaultReader} and locks the stream to the new reader.\n   * While the stream is locked, no other reader can be acquired until this one is released.\n   *\n   * This functionality is especially useful for creating abstractions that desire the ability to consume a stream\n   * in its entirety. By getting a reader for the stream, you can ensure nobody else can interleave reads with yours\n   * or cancel the stream, which would interfere with your abstraction.\n   */\n  getReader(): ReadableStreamDefaultReader<R>;\n  getReader(\n    rawOptions: ReadableStreamGetReaderOptions | null | undefined = undefined\n  ): ReadableStreamDefaultReader<R> | ReadableStreamBYOBReader {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('getReader');\n    }\n\n    const options = convertReaderOptions(rawOptions, 'First parameter');\n\n    if (options.mode === undefined) {\n      return AcquireReadableStreamDefaultReader(this);\n    }\n\n    assert(options.mode === 'byob');\n    return AcquireReadableStreamBYOBReader(this as unknown as ReadableByteStream);\n  }\n\n  /**\n   * Provides a convenient, chainable way of piping this readable stream through a transform stream\n   * (or any other `{ writable, readable }` pair). It simply {@link ReadableStream.pipeTo | pipes} the stream\n   * into the writable side of the supplied pair, and returns the readable side for further use.\n   *\n   * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.\n   */\n  pipeThrough<RS extends ReadableStream>(\n    transform: { readable: RS; writable: WritableStream<R> },\n    options?: StreamPipeOptions\n  ): RS;\n  pipeThrough<RS extends ReadableStream>(\n    rawTransform: { readable: RS; writable: WritableStream<R> } | null | undefined,\n    rawOptions: StreamPipeOptions | null | undefined = {}\n  ): RS {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('pipeThrough');\n    }\n    assertRequiredArgument(rawTransform, 1, 'pipeThrough');\n\n    const transform = convertReadableWritablePair(rawTransform, 'First parameter');\n    const options = convertPipeOptions(rawOptions, 'Second parameter');\n\n    if (IsReadableStreamLocked(this)) {\n      throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked ReadableStream');\n    }\n    if (IsWritableStreamLocked(transform.writable)) {\n      throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked WritableStream');\n    }\n\n    const promise = ReadableStreamPipeTo(\n      this, transform.writable, options.preventClose, options.preventAbort, options.preventCancel, options.signal\n    );\n\n    setPromiseIsHandledToTrue(promise);\n\n    return transform.readable;\n  }\n\n  /**\n   * Pipes this readable stream to a given writable stream. The way in which the piping process behaves under\n   * various error conditions can be customized with a number of passed options. It returns a promise that fulfills\n   * when the piping process completes successfully, or rejects if any errors were encountered.\n   *\n   * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.\n   */\n  pipeTo(destination: WritableStream<R>, options?: StreamPipeOptions): Promise<void>;\n  pipeTo(destination: WritableStream<R> | null | undefined,\n         rawOptions: StreamPipeOptions | null | undefined = {}): Promise<void> {\n    if (!IsReadableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('pipeTo'));\n    }\n\n    if (destination === undefined) {\n      return promiseRejectedWith(`Parameter 1 is required in 'pipeTo'.`);\n    }\n    if (!IsWritableStream(destination)) {\n      return promiseRejectedWith(\n        new TypeError(`ReadableStream.prototype.pipeTo's first argument must be a WritableStream`)\n      );\n    }\n\n    let options: ValidatedStreamPipeOptions;\n    try {\n      options = convertPipeOptions(rawOptions, 'Second parameter');\n    } catch (e) {\n      return promiseRejectedWith(e);\n    }\n\n    if (IsReadableStreamLocked(this)) {\n      return promiseRejectedWith(\n        new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream')\n      );\n    }\n    if (IsWritableStreamLocked(destination)) {\n      return promiseRejectedWith(\n        new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream')\n      );\n    }\n\n    return ReadableStreamPipeTo<R>(\n      this, destination, options.preventClose, options.preventAbort, options.preventCancel, options.signal\n    );\n  }\n\n  /**\n   * Tees this readable stream, returning a two-element array containing the two resulting branches as\n   * new {@link ReadableStream} instances.\n   *\n   * Teeing a stream will lock it, preventing any other consumer from acquiring a reader.\n   * To cancel the stream, cancel both of the resulting branches; a composite cancellation reason will then be\n   * propagated to the stream's underlying source.\n   *\n   * Note that the chunks seen in each branch will be the same object. If the chunks are not immutable,\n   * this could allow interference between the two branches.\n   */\n  tee(): [ReadableStream<R>, ReadableStream<R>] {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('tee');\n    }\n\n    const branches = ReadableStreamTee(this, false);\n    return CreateArrayFromList(branches);\n  }\n\n  /**\n   * Asynchronously iterates over the chunks in the stream's internal queue.\n   *\n   * Asynchronously iterating over the stream will lock it, preventing any other consumer from acquiring a reader.\n   * The lock will be released if the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method\n   * is called, e.g. by breaking out of the loop.\n   *\n   * By default, calling the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method will also\n   * cancel the stream. To prevent this, use the stream's {@link ReadableStream.values | values()} method, passing\n   * `true` for the `preventCancel` option.\n   */\n  values(options?: ReadableStreamIteratorOptions): ReadableStreamAsyncIterator<R>;\n  values(rawOptions: ReadableStreamIteratorOptions | null | undefined = undefined): ReadableStreamAsyncIterator<R> {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('values');\n    }\n\n    const options = convertIteratorOptions(rawOptions, 'First parameter');\n    return AcquireReadableStreamAsyncIterator<R>(this, options.preventCancel);\n  }\n\n  /**\n   * {@inheritDoc ReadableStream.values}\n   */\n  [Symbol.asyncIterator]: (options?: ReadableStreamIteratorOptions) => ReadableStreamAsyncIterator<R>;\n}\n\nObject.defineProperties(ReadableStream.prototype, {\n  cancel: { enumerable: true },\n  getReader: { enumerable: true },\n  pipeThrough: { enumerable: true },\n  pipeTo: { enumerable: true },\n  tee: { enumerable: true },\n  values: { enumerable: true },\n  locked: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStream.prototype, Symbol.toStringTag, {\n    value: 'ReadableStream',\n    configurable: true\n  });\n}\nif (typeof Symbol.asyncIterator === 'symbol') {\n  Object.defineProperty(ReadableStream.prototype, Symbol.asyncIterator, {\n    value: ReadableStream.prototype.values,\n    writable: true,\n    configurable: true\n  });\n}\n\nexport {\n  ReadableStreamAsyncIterator,\n  ReadableStreamDefaultReadResult,\n  ReadableStreamBYOBReadResult,\n  UnderlyingByteSource,\n  UnderlyingSource,\n  UnderlyingSourceStartCallback,\n  UnderlyingSourcePullCallback,\n  UnderlyingSourceCancelCallback,\n  UnderlyingByteSourceStartCallback,\n  UnderlyingByteSourcePullCallback,\n  StreamPipeOptions,\n  ReadableWritablePair,\n  ReadableStreamIteratorOptions\n};\n\n// Abstract operations for the ReadableStream.\n\n// Throws if and only if startAlgorithm throws.\nexport function CreateReadableStream<R>(startAlgorithm: () => void | PromiseLike<void>,\n                                        pullAlgorithm: () => Promise<void>,\n                                        cancelAlgorithm: (reason: any) => Promise<void>,\n                                        highWaterMark = 1,\n                                        sizeAlgorithm: QueuingStrategySizeCallback<R> = () => 1): ReadableStream<R> {\n  assert(IsNonNegativeNumber(highWaterMark));\n\n  const stream: ReadableStream<R> = Object.create(ReadableStream.prototype);\n  InitializeReadableStream(stream);\n\n  const controller: ReadableStreamDefaultController<R> = Object.create(ReadableStreamDefaultController.prototype);\n  SetUpReadableStreamDefaultController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm\n  );\n\n  return stream;\n}\n\n// Throws if and only if startAlgorithm throws.\nexport function CreateReadableByteStream(\n  startAlgorithm: () => void | PromiseLike<void>,\n  pullAlgorithm: () => Promise<void>,\n  cancelAlgorithm: (reason: any) => Promise<void>\n): ReadableByteStream {\n  const stream: ReadableByteStream = Object.create(ReadableStream.prototype);\n  InitializeReadableStream(stream);\n\n  const controller: ReadableByteStreamController = Object.create(ReadableByteStreamController.prototype);\n  SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, 0, undefined);\n\n  return stream;\n}\n\nfunction InitializeReadableStream(stream: ReadableStream) {\n  stream._state = 'readable';\n  stream._reader = undefined;\n  stream._storedError = undefined;\n  stream._disturbed = false;\n}\n\nexport function IsReadableStream(x: unknown): x is ReadableStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readableStreamController')) {\n    return false;\n  }\n\n  return x instanceof ReadableStream;\n}\n\nexport function IsReadableStreamDisturbed(stream: ReadableStream): boolean {\n  assert(IsReadableStream(stream));\n\n  return stream._disturbed;\n}\n\nexport function IsReadableStreamLocked(stream: ReadableStream): boolean {\n  assert(IsReadableStream(stream));\n\n  if (stream._reader === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamCancel<R>(stream: ReadableStream<R>, reason: any): Promise<undefined> {\n  stream._disturbed = true;\n\n  if (stream._state === 'closed') {\n    return promiseResolvedWith(undefined);\n  }\n  if (stream._state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  ReadableStreamClose(stream);\n\n  const reader = stream._reader;\n  if (reader !== undefined && IsReadableStreamBYOBReader(reader)) {\n    reader._readIntoRequests.forEach(readIntoRequest => {\n      readIntoRequest._closeSteps(undefined);\n    });\n    reader._readIntoRequests = new SimpleQueue();\n  }\n\n  const sourceCancelPromise = stream._readableStreamController[CancelSteps](reason);\n  return transformPromiseWith(sourceCancelPromise, noop);\n}\n\nexport function ReadableStreamClose<R>(stream: ReadableStream<R>): void {\n  assert(stream._state === 'readable');\n\n  stream._state = 'closed';\n\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return;\n  }\n\n  defaultReaderClosedPromiseResolve(reader);\n\n  if (IsReadableStreamDefaultReader<R>(reader)) {\n    reader._readRequests.forEach(readRequest => {\n      readRequest._closeSteps();\n    });\n    reader._readRequests = new SimpleQueue();\n  }\n}\n\nexport function ReadableStreamError<R>(stream: ReadableStream<R>, e: any): void {\n  assert(IsReadableStream(stream));\n  assert(stream._state === 'readable');\n\n  stream._state = 'errored';\n  stream._storedError = e;\n\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return;\n  }\n\n  defaultReaderClosedPromiseReject(reader, e);\n\n  if (IsReadableStreamDefaultReader<R>(reader)) {\n    reader._readRequests.forEach(readRequest => {\n      readRequest._errorSteps(e);\n    });\n\n    reader._readRequests = new SimpleQueue();\n  } else {\n    assert(IsReadableStreamBYOBReader(reader));\n\n    reader._readIntoRequests.forEach(readIntoRequest => {\n      readIntoRequest._errorSteps(e);\n    });\n\n    reader._readIntoRequests = new SimpleQueue();\n  }\n}\n\n// Readers\n\nexport type ReadableStreamReader<R> = ReadableStreamDefaultReader<R> | ReadableStreamBYOBReader;\n\nexport {\n  ReadableStreamDefaultReader,\n  ReadableStreamBYOBReader\n};\n\n// Controllers\n\nexport {\n  ReadableStreamDefaultController,\n  ReadableStreamBYOBRequest,\n  ReadableByteStreamController\n};\n\n// Helper functions for the ReadableStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(`ReadableStream.prototype.${name} can only be used on a ReadableStream`);\n}\n","import { assertDictionary, assertRequiredField } from './basic';\nimport { ReadableStream } from '../readable-stream';\nimport { WritableStream } from '../writable-stream';\nimport { assertReadableStream } from './readable-stream';\nimport { assertWritableStream } from './writable-stream';\n\nexport function convertReadableWritablePair<RS extends ReadableStream, WS extends WritableStream>(\n  pair: { readable: RS; writable: WS } | null | undefined,\n  context: string\n): { readable: RS; writable: WS } {\n  assertDictionary(pair, context);\n\n  const readable = pair?.readable;\n  assertRequiredField(readable, 'readable', 'ReadableWritablePair');\n  assertReadableStream(readable, `${context} has member 'readable' that`);\n\n  const writable = pair?.writable;\n  assertRequiredField(writable, 'writable', 'ReadableWritablePair');\n  assertWritableStream(writable, `${context} has member 'writable' that`);\n\n  return { readable, writable };\n}\n","import { assertDictionary } from './basic';\nimport {\n  ReadableStreamIteratorOptions,\n  ValidatedReadableStreamIteratorOptions\n} from '../readable-stream/iterator-options';\n\nexport function convertIteratorOptions(options: ReadableStreamIteratorOptions | null | undefined,\n                                       context: string): ValidatedReadableStreamIteratorOptions {\n  assertDictionary(options, context);\n  const preventCancel = options?.preventCancel;\n  return { preventCancel: Boolean(preventCancel) };\n}\n","import { QueuingStrategyInit } from '../queuing-strategy';\nimport { assertDictionary, assertRequiredField, convertUnrestrictedDouble } from './basic';\n\nexport function convertQueuingStrategyInit(init: QueuingStrategyInit | null | undefined,\n                                           context: string): QueuingStrategyInit {\n  assertDictionary(init, context);\n  const highWaterMark = init?.highWaterMark;\n  assertRequiredField(highWaterMark, 'highWaterMark', 'QueuingStrategyInit');\n  return {\n    highWaterMark: convertUnrestrictedDouble(highWaterMark)\n  };\n}\n","import { QueuingStrategy, QueuingStrategyInit } from './queuing-strategy';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategyInit } from './validators/queuing-strategy-init';\n\n// The size function must not have a prototype property nor be a constructor\nconst byteLengthSizeFunction = (chunk: ArrayBufferView): number => {\n  return chunk.byteLength;\n};\ntry {\n  Object.defineProperty(byteLengthSizeFunction, 'name', {\n    value: 'size',\n    configurable: true\n  });\n} catch {\n  // This property is non-configurable in older browsers, so ignore if this throws.\n  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility\n}\n\n/**\n * A queuing strategy that counts the number of bytes in each chunk.\n *\n * @public\n */\nexport default class ByteLengthQueuingStrategy implements QueuingStrategy<ArrayBufferView> {\n  /** @internal */\n  readonly _byteLengthQueuingStrategyHighWaterMark: number;\n\n  constructor(options: QueuingStrategyInit) {\n    assertRequiredArgument(options, 1, 'ByteLengthQueuingStrategy');\n    options = convertQueuingStrategyInit(options, 'First parameter');\n    this._byteLengthQueuingStrategyHighWaterMark = options.highWaterMark;\n  }\n\n  /**\n   * Returns the high water mark provided to the constructor.\n   */\n  get highWaterMark(): number {\n    if (!IsByteLengthQueuingStrategy(this)) {\n      throw byteLengthBrandCheckException('highWaterMark');\n    }\n    return this._byteLengthQueuingStrategyHighWaterMark;\n  }\n\n  /**\n   * Measures the size of `chunk` by returning the value of its `byteLength` property.\n   */\n  get size(): (chunk: ArrayBufferView) => number {\n    if (!IsByteLengthQueuingStrategy(this)) {\n      throw byteLengthBrandCheckException('size');\n    }\n    return byteLengthSizeFunction;\n  }\n}\n\nObject.defineProperties(ByteLengthQueuingStrategy.prototype, {\n  highWaterMark: { enumerable: true },\n  size: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ByteLengthQueuingStrategy.prototype, Symbol.toStringTag, {\n    value: 'ByteLengthQueuingStrategy',\n    configurable: true\n  });\n}\n\n// Helper functions for the ByteLengthQueuingStrategy.\n\nfunction byteLengthBrandCheckException(name: string): TypeError {\n  return new TypeError(`ByteLengthQueuingStrategy.prototype.${name} can only be used on a ByteLengthQueuingStrategy`);\n}\n\nexport function IsByteLengthQueuingStrategy(x: any): x is ByteLengthQueuingStrategy {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_byteLengthQueuingStrategyHighWaterMark')) {\n    return false;\n  }\n\n  return x instanceof ByteLengthQueuingStrategy;\n}\n","import { QueuingStrategy, QueuingStrategyInit } from './queuing-strategy';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategyInit } from './validators/queuing-strategy-init';\n\n// The size function must not have a prototype property nor be a constructor\nconst countSizeFunction = (): 1 => {\n  return 1;\n};\ntry {\n  Object.defineProperty(countSizeFunction, 'name', {\n    value: 'size',\n    configurable: true\n  });\n} catch {\n  // This property is non-configurable in older browsers, so ignore if this throws.\n  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility\n}\n\n/**\n * A queuing strategy that counts the number of chunks.\n *\n * @public\n */\nexport default class CountQueuingStrategy implements QueuingStrategy<any> {\n  /** @internal */\n  readonly _countQueuingStrategyHighWaterMark!: number;\n\n  constructor(options: QueuingStrategyInit) {\n    assertRequiredArgument(options, 1, 'CountQueuingStrategy');\n    options = convertQueuingStrategyInit(options, 'First parameter');\n    this._countQueuingStrategyHighWaterMark = options.highWaterMark;\n  }\n\n  /**\n   * Returns the high water mark provided to the constructor.\n   */\n  get highWaterMark(): number {\n    if (!IsCountQueuingStrategy(this)) {\n      throw countBrandCheckException('highWaterMark');\n    }\n    return this._countQueuingStrategyHighWaterMark;\n  }\n\n  /**\n   * Measures the size of `chunk` by always returning 1.\n   * This ensures that the total queue size is a count of the number of chunks in the queue.\n   */\n  get size(): (chunk: any) => 1 {\n    if (!IsCountQueuingStrategy(this)) {\n      throw countBrandCheckException('size');\n    }\n    return countSizeFunction;\n  }\n}\n\nObject.defineProperties(CountQueuingStrategy.prototype, {\n  highWaterMark: { enumerable: true },\n  size: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(CountQueuingStrategy.prototype, Symbol.toStringTag, {\n    value: 'CountQueuingStrategy',\n    configurable: true\n  });\n}\n\n// Helper functions for the CountQueuingStrategy.\n\nfunction countBrandCheckException(name: string): TypeError {\n  return new TypeError(`CountQueuingStrategy.prototype.${name} can only be used on a CountQueuingStrategy`);\n}\n\nexport function IsCountQueuingStrategy(x: any): x is CountQueuingStrategy {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_countQueuingStrategyHighWaterMark')) {\n    return false;\n  }\n\n  return x instanceof CountQueuingStrategy;\n}\n","import { assertDictionary, assertFunction } from './basic';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\nimport {\n  Transformer,\n  TransformerFlushCallback,\n  TransformerStartCallback,\n  TransformerTransformCallback,\n  ValidatedTransformer\n} from '../transform-stream/transformer';\nimport { TransformStreamDefaultController } from '../transform-stream';\n\nexport function convertTransformer<I, O>(original: Transformer<I, O> | null,\n                                         context: string): ValidatedTransformer<I, O> {\n  assertDictionary(original, context);\n  const flush = original?.flush;\n  const readableType = original?.readableType;\n  const start = original?.start;\n  const transform = original?.transform;\n  const writableType = original?.writableType;\n  return {\n    flush: flush === undefined ?\n      undefined :\n      convertTransformerFlushCallback(flush, original!, `${context} has member 'flush' that`),\n    readableType,\n    start: start === undefined ?\n      undefined :\n      convertTransformerStartCallback(start, original!, `${context} has member 'start' that`),\n    transform: transform === undefined ?\n      undefined :\n      convertTransformerTransformCallback(transform, original!, `${context} has member 'transform' that`),\n    writableType\n  };\n}\n\nfunction convertTransformerFlushCallback<I, O>(\n  fn: TransformerFlushCallback<O>,\n  original: Transformer<I, O>,\n  context: string\n): (controller: TransformStreamDefaultController<O>) => Promise<void> {\n  assertFunction(fn, context);\n  return (controller: TransformStreamDefaultController<O>) => promiseCall(fn, original, [controller]);\n}\n\nfunction convertTransformerStartCallback<I, O>(\n  fn: TransformerStartCallback<O>,\n  original: Transformer<I, O>,\n  context: string\n): TransformerStartCallback<O> {\n  assertFunction(fn, context);\n  return (controller: TransformStreamDefaultController<O>) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertTransformerTransformCallback<I, O>(\n  fn: TransformerTransformCallback<I, O>,\n  original: Transformer<I, O>,\n  context: string\n): (chunk: I, controller: TransformStreamDefaultController<O>) => Promise<void> {\n  assertFunction(fn, context);\n  return (chunk: I, controller: TransformStreamDefaultController<O>) => promiseCall(fn, original, [chunk, controller]);\n}\n","import assert from '../stub/assert';\nimport { newPromise, promiseRejectedWith, promiseResolvedWith, transformPromiseWith } from './helpers/webidl';\nimport { CreateReadableStream, ReadableStream, ReadableStreamDefaultController } from './readable-stream';\nimport {\n  ReadableStreamDefaultControllerCanCloseOrEnqueue,\n  ReadableStreamDefaultControllerClose,\n  ReadableStreamDefaultControllerEnqueue,\n  ReadableStreamDefaultControllerError,\n  ReadableStreamDefaultControllerGetDesiredSize,\n  ReadableStreamDefaultControllerHasBackpressure\n} from './readable-stream/default-controller';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { CreateWritableStream, WritableStream, WritableStreamDefaultControllerErrorIfNeeded } from './writable-stream';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport {\n  Transformer,\n  TransformerFlushCallback,\n  TransformerStartCallback,\n  TransformerTransformCallback,\n  ValidatedTransformer\n} from './transform-stream/transformer';\nimport { convertTransformer } from './validators/transformer';\n\n// Class TransformStream\n\n/**\n * A transform stream consists of a pair of streams: a {@link WritableStream | writable stream},\n * known as its writable side, and a {@link ReadableStream | readable stream}, known as its readable side.\n * In a manner specific to the transform stream in question, writes to the writable side result in new data being\n * made available for reading from the readable side.\n *\n * @public\n */\nexport class TransformStream<I = any, O = any> {\n  /** @internal */\n  _writable!: WritableStream<I>;\n  /** @internal */\n  _readable!: ReadableStream<O>;\n  /** @internal */\n  _backpressure!: boolean;\n  /** @internal */\n  _backpressureChangePromise!: Promise<void>;\n  /** @internal */\n  _backpressureChangePromise_resolve!: () => void;\n  /** @internal */\n  _transformStreamController!: TransformStreamDefaultController<O>;\n\n  constructor(\n    transformer?: Transformer<I, O>,\n    writableStrategy?: QueuingStrategy<I>,\n    readableStrategy?: QueuingStrategy<O>\n  );\n  constructor(rawTransformer: Transformer<I, O> | null | undefined = {},\n              rawWritableStrategy: QueuingStrategy<I> | null | undefined = {},\n              rawReadableStrategy: QueuingStrategy<O> | null | undefined = {}) {\n    if (rawTransformer === undefined) {\n      rawTransformer = null;\n    }\n\n    const writableStrategy = convertQueuingStrategy(rawWritableStrategy, 'Second parameter');\n    const readableStrategy = convertQueuingStrategy(rawReadableStrategy, 'Third parameter');\n\n    const transformer = convertTransformer(rawTransformer, 'First parameter');\n    if (transformer.readableType !== undefined) {\n      throw new RangeError('Invalid readableType specified');\n    }\n    if (transformer.writableType !== undefined) {\n      throw new RangeError('Invalid writableType specified');\n    }\n\n    const readableHighWaterMark = ExtractHighWaterMark(readableStrategy, 0);\n    const readableSizeAlgorithm = ExtractSizeAlgorithm(readableStrategy);\n    const writableHighWaterMark = ExtractHighWaterMark(writableStrategy, 1);\n    const writableSizeAlgorithm = ExtractSizeAlgorithm(writableStrategy);\n\n    let startPromise_resolve!: (value: void | PromiseLike<void>) => void;\n    const startPromise = newPromise<void>(resolve => {\n      startPromise_resolve = resolve;\n    });\n\n    InitializeTransformStream(\n      this, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm\n    );\n    SetUpTransformStreamDefaultControllerFromTransformer(this, transformer);\n\n    if (transformer.start !== undefined) {\n      startPromise_resolve(transformer.start(this._transformStreamController));\n    } else {\n      startPromise_resolve(undefined);\n    }\n  }\n\n  /**\n   * The readable side of the transform stream.\n   */\n  get readable(): ReadableStream<O> {\n    if (!IsTransformStream(this)) {\n      throw streamBrandCheckException('readable');\n    }\n\n    return this._readable;\n  }\n\n  /**\n   * The writable side of the transform stream.\n   */\n  get writable(): WritableStream<I> {\n    if (!IsTransformStream(this)) {\n      throw streamBrandCheckException('writable');\n    }\n\n    return this._writable;\n  }\n}\n\nObject.defineProperties(TransformStream.prototype, {\n  readable: { enumerable: true },\n  writable: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(TransformStream.prototype, Symbol.toStringTag, {\n    value: 'TransformStream',\n    configurable: true\n  });\n}\n\nexport {\n  Transformer,\n  TransformerStartCallback,\n  TransformerFlushCallback,\n  TransformerTransformCallback\n};\n\n// Transform Stream Abstract Operations\n\nexport function CreateTransformStream<I, O>(startAlgorithm: () => void | PromiseLike<void>,\n                                            transformAlgorithm: (chunk: I) => Promise<void>,\n                                            flushAlgorithm: () => Promise<void>,\n                                            writableHighWaterMark = 1,\n                                            writableSizeAlgorithm: QueuingStrategySizeCallback<I> = () => 1,\n                                            readableHighWaterMark = 0,\n                                            readableSizeAlgorithm: QueuingStrategySizeCallback<O> = () => 1) {\n  assert(IsNonNegativeNumber(writableHighWaterMark));\n  assert(IsNonNegativeNumber(readableHighWaterMark));\n\n  const stream: TransformStream<I, O> = Object.create(TransformStream.prototype);\n\n  let startPromise_resolve!: (value: void | PromiseLike<void>) => void;\n  const startPromise = newPromise<void>(resolve => {\n    startPromise_resolve = resolve;\n  });\n\n  InitializeTransformStream(stream, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark,\n                            readableSizeAlgorithm);\n\n  const controller: TransformStreamDefaultController<O> = Object.create(TransformStreamDefaultController.prototype);\n\n  SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);\n\n  const startResult = startAlgorithm();\n  startPromise_resolve(startResult);\n  return stream;\n}\n\nfunction InitializeTransformStream<I, O>(stream: TransformStream<I, O>,\n                                         startPromise: Promise<void>,\n                                         writableHighWaterMark: number,\n                                         writableSizeAlgorithm: QueuingStrategySizeCallback<I>,\n                                         readableHighWaterMark: number,\n                                         readableSizeAlgorithm: QueuingStrategySizeCallback<O>) {\n  function startAlgorithm(): Promise<void> {\n    return startPromise;\n  }\n\n  function writeAlgorithm(chunk: I): Promise<void> {\n    return TransformStreamDefaultSinkWriteAlgorithm(stream, chunk);\n  }\n\n  function abortAlgorithm(reason: any): Promise<void> {\n    return TransformStreamDefaultSinkAbortAlgorithm(stream, reason);\n  }\n\n  function closeAlgorithm(): Promise<void> {\n    return TransformStreamDefaultSinkCloseAlgorithm(stream);\n  }\n\n  stream._writable = CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm,\n                                          writableHighWaterMark, writableSizeAlgorithm);\n\n  function pullAlgorithm(): Promise<void> {\n    return TransformStreamDefaultSourcePullAlgorithm(stream);\n  }\n\n  function cancelAlgorithm(reason: any): Promise<void> {\n    TransformStreamErrorWritableAndUnblockWrite(stream, reason);\n    return promiseResolvedWith(undefined);\n  }\n\n  stream._readable = CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, readableHighWaterMark,\n                                          readableSizeAlgorithm);\n\n  // The [[backpressure]] slot is set to undefined so that it can be initialised by TransformStreamSetBackpressure.\n  stream._backpressure = undefined!;\n  stream._backpressureChangePromise = undefined!;\n  stream._backpressureChangePromise_resolve = undefined!;\n  TransformStreamSetBackpressure(stream, true);\n\n  stream._transformStreamController = undefined!;\n}\n\nfunction IsTransformStream(x: unknown): x is TransformStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_transformStreamController')) {\n    return false;\n  }\n\n  return x instanceof TransformStream;\n}\n\n// This is a no-op if both sides are already errored.\nfunction TransformStreamError(stream: TransformStream, e: any) {\n  ReadableStreamDefaultControllerError(\n    stream._readable._readableStreamController as ReadableStreamDefaultController<any>,\n    e\n  );\n  TransformStreamErrorWritableAndUnblockWrite(stream, e);\n}\n\nfunction TransformStreamErrorWritableAndUnblockWrite(stream: TransformStream, e: any) {\n  TransformStreamDefaultControllerClearAlgorithms(stream._transformStreamController);\n  WritableStreamDefaultControllerErrorIfNeeded(stream._writable._writableStreamController, e);\n  if (stream._backpressure) {\n    // Pretend that pull() was called to permit any pending write() calls to complete. TransformStreamSetBackpressure()\n    // cannot be called from enqueue() or pull() once the ReadableStream is errored, so this will will be the final time\n    // _backpressure is set.\n    TransformStreamSetBackpressure(stream, false);\n  }\n}\n\nfunction TransformStreamSetBackpressure(stream: TransformStream, backpressure: boolean) {\n  // Passes also when called during construction.\n  assert(stream._backpressure !== backpressure);\n\n  if (stream._backpressureChangePromise !== undefined) {\n    stream._backpressureChangePromise_resolve();\n  }\n\n  stream._backpressureChangePromise = newPromise(resolve => {\n    stream._backpressureChangePromise_resolve = resolve;\n  });\n\n  stream._backpressure = backpressure;\n}\n\n// Class TransformStreamDefaultController\n\n/**\n * Allows control of the {@link ReadableStream} and {@link WritableStream} of the associated {@link TransformStream}.\n *\n * @public\n */\nexport class TransformStreamDefaultController<O> {\n  /** @internal */\n  _controlledTransformStream: TransformStream<any, O>;\n  /** @internal */\n  _transformAlgorithm: (chunk: any) => Promise<void>;\n  /** @internal */\n  _flushAlgorithm: () => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the desired size to fill the readable side’s internal queue. It can be negative, if the queue is over-full.\n   */\n  get desiredSize(): number | null {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('desiredSize');\n    }\n\n    const readableController = this._controlledTransformStream._readable._readableStreamController;\n    return ReadableStreamDefaultControllerGetDesiredSize(readableController as ReadableStreamDefaultController<O>);\n  }\n\n  /**\n   * Enqueues the given chunk `chunk` in the readable side of the controlled transform stream.\n   */\n  enqueue(chunk: O): void;\n  enqueue(chunk: O = undefined!): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('enqueue');\n    }\n\n    TransformStreamDefaultControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors both the readable side and the writable side of the controlled transform stream, making all future\n   * interactions with it fail with the given error `e`. Any chunks queued for transformation will be discarded.\n   */\n  error(reason: any = undefined): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n\n    TransformStreamDefaultControllerError(this, reason);\n  }\n\n  /**\n   * Closes the readable side and errors the writable side of the controlled transform stream. This is useful when the\n   * transformer only needs to consume a portion of the chunks written to the writable side.\n   */\n  terminate(): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('terminate');\n    }\n\n    TransformStreamDefaultControllerTerminate(this);\n  }\n}\n\nObject.defineProperties(TransformStreamDefaultController.prototype, {\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  terminate: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(TransformStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'TransformStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Transform Stream Default Controller Abstract Operations\n\nfunction IsTransformStreamDefaultController<O = any>(x: any): x is TransformStreamDefaultController<O> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledTransformStream')) {\n    return false;\n  }\n\n  return x instanceof TransformStreamDefaultController;\n}\n\nfunction SetUpTransformStreamDefaultController<I, O>(stream: TransformStream<I, O>,\n                                                     controller: TransformStreamDefaultController<O>,\n                                                     transformAlgorithm: (chunk: I) => Promise<void>,\n                                                     flushAlgorithm: () => Promise<void>) {\n  assert(IsTransformStream(stream));\n  assert(stream._transformStreamController === undefined);\n\n  controller._controlledTransformStream = stream;\n  stream._transformStreamController = controller;\n\n  controller._transformAlgorithm = transformAlgorithm;\n  controller._flushAlgorithm = flushAlgorithm;\n}\n\nfunction SetUpTransformStreamDefaultControllerFromTransformer<I, O>(stream: TransformStream<I, O>,\n                                                                    transformer: ValidatedTransformer<I, O>) {\n  const controller: TransformStreamDefaultController<O> = Object.create(TransformStreamDefaultController.prototype);\n\n  let transformAlgorithm = (chunk: I): Promise<void> => {\n    try {\n      TransformStreamDefaultControllerEnqueue(controller, chunk as unknown as O);\n      return promiseResolvedWith(undefined);\n    } catch (transformResultE) {\n      return promiseRejectedWith(transformResultE);\n    }\n  };\n\n  let flushAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (transformer.transform !== undefined) {\n    transformAlgorithm = chunk => transformer.transform!(chunk, controller);\n  }\n  if (transformer.flush !== undefined) {\n    flushAlgorithm = () => transformer.flush!(controller);\n  }\n\n  SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);\n}\n\nfunction TransformStreamDefaultControllerClearAlgorithms(controller: TransformStreamDefaultController<any>) {\n  controller._transformAlgorithm = undefined!;\n  controller._flushAlgorithm = undefined!;\n}\n\nfunction TransformStreamDefaultControllerEnqueue<O>(controller: TransformStreamDefaultController<O>, chunk: O) {\n  const stream = controller._controlledTransformStream;\n  const readableController = stream._readable._readableStreamController as ReadableStreamDefaultController<O>;\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(readableController)) {\n    throw new TypeError('Readable side is not in a state that permits enqueue');\n  }\n\n  // We throttle transform invocations based on the backpressure of the ReadableStream, but we still\n  // accept TransformStreamDefaultControllerEnqueue() calls.\n\n  try {\n    ReadableStreamDefaultControllerEnqueue(readableController, chunk);\n  } catch (e) {\n    // This happens when readableStrategy.size() throws.\n    TransformStreamErrorWritableAndUnblockWrite(stream, e);\n\n    throw stream._readable._storedError;\n  }\n\n  const backpressure = ReadableStreamDefaultControllerHasBackpressure(readableController);\n  if (backpressure !== stream._backpressure) {\n    assert(backpressure);\n    TransformStreamSetBackpressure(stream, true);\n  }\n}\n\nfunction TransformStreamDefaultControllerError(controller: TransformStreamDefaultController<any>, e: any) {\n  TransformStreamError(controller._controlledTransformStream, e);\n}\n\nfunction TransformStreamDefaultControllerPerformTransform<I, O>(controller: TransformStreamDefaultController<O>,\n                                                                chunk: I) {\n  const transformPromise = controller._transformAlgorithm(chunk);\n  return transformPromiseWith(transformPromise, undefined, r => {\n    TransformStreamError(controller._controlledTransformStream, r);\n    throw r;\n  });\n}\n\nfunction TransformStreamDefaultControllerTerminate<O>(controller: TransformStreamDefaultController<O>) {\n  const stream = controller._controlledTransformStream;\n  const readableController = stream._readable._readableStreamController as ReadableStreamDefaultController<O>;\n\n  ReadableStreamDefaultControllerClose(readableController);\n\n  const error = new TypeError('TransformStream terminated');\n  TransformStreamErrorWritableAndUnblockWrite(stream, error);\n}\n\n// TransformStreamDefaultSink Algorithms\n\nfunction TransformStreamDefaultSinkWriteAlgorithm<I, O>(stream: TransformStream<I, O>, chunk: I): Promise<void> {\n  assert(stream._writable._state === 'writable');\n\n  const controller = stream._transformStreamController;\n\n  if (stream._backpressure) {\n    const backpressureChangePromise = stream._backpressureChangePromise;\n    assert(backpressureChangePromise !== undefined);\n    return transformPromiseWith(backpressureChangePromise, () => {\n      const writable = stream._writable;\n      const state = writable._state;\n      if (state === 'erroring') {\n        throw writable._storedError;\n      }\n      assert(state === 'writable');\n      return TransformStreamDefaultControllerPerformTransform<I, O>(controller, chunk);\n    });\n  }\n\n  return TransformStreamDefaultControllerPerformTransform<I, O>(controller, chunk);\n}\n\nfunction TransformStreamDefaultSinkAbortAlgorithm(stream: TransformStream, reason: any): Promise<void> {\n  // abort() is not called synchronously, so it is possible for abort() to be called when the stream is already\n  // errored.\n  TransformStreamError(stream, reason);\n  return promiseResolvedWith(undefined);\n}\n\nfunction TransformStreamDefaultSinkCloseAlgorithm<I, O>(stream: TransformStream<I, O>): Promise<void> {\n  // stream._readable cannot change after construction, so caching it across a call to user code is safe.\n  const readable = stream._readable;\n\n  const controller = stream._transformStreamController;\n  const flushPromise = controller._flushAlgorithm();\n  TransformStreamDefaultControllerClearAlgorithms(controller);\n\n  // Return a promise that is fulfilled with undefined on success.\n  return transformPromiseWith(flushPromise, () => {\n    if (readable._state === 'errored') {\n      throw readable._storedError;\n    }\n    ReadableStreamDefaultControllerClose(readable._readableStreamController as ReadableStreamDefaultController<O>);\n  }, r => {\n    TransformStreamError(stream, r);\n    throw readable._storedError;\n  });\n}\n\n// TransformStreamDefaultSource Algorithms\n\nfunction TransformStreamDefaultSourcePullAlgorithm(stream: TransformStream): Promise<void> {\n  // Invariant. Enforced by the promises returned by start() and pull().\n  assert(stream._backpressure);\n\n  assert(stream._backpressureChangePromise !== undefined);\n\n  TransformStreamSetBackpressure(stream, false);\n\n  // Prevent the next pull() call until there is backpressure.\n  return stream._backpressureChangePromise;\n}\n\n// Helper functions for the TransformStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `TransformStreamDefaultController.prototype.${name} can only be used on a TransformStreamDefaultController`);\n}\n\n// Helper functions for the TransformStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `TransformStream.prototype.${name} can only be used on a TransformStream`);\n}\n","import {\n  ByteLengthQueuingStrategy,\n  CountQueuingStrategy,\n  ReadableByteStreamController,\n  ReadableStream,\n  ReadableStreamBYOBReader,\n  ReadableStreamBYOBRequest,\n  ReadableStreamDefaultController,\n  ReadableStreamDefaultReader,\n  TransformStream,\n  TransformStreamDefaultController,\n  WritableStream,\n  WritableStreamDefaultController,\n  WritableStreamDefaultWriter\n} from './ponyfill';\nimport { globals } from './utils';\n\n// Export\nexport * from './ponyfill';\n\nconst exports = {\n  ReadableStream,\n  ReadableStreamDefaultController,\n  ReadableByteStreamController,\n  ReadableStreamBYOBRequest,\n  ReadableStreamDefaultReader,\n  ReadableStreamBYOBReader,\n\n  WritableStream,\n  WritableStreamDefaultController,\n  WritableStreamDefaultWriter,\n\n  ByteLengthQueuingStrategy,\n  CountQueuingStrategy,\n\n  TransformStream,\n  TransformStreamDefaultController\n};\n\n// Add classes to global scope\nif (typeof globals !== 'undefined') {\n  for (const prop in exports) {\n    if (Object.prototype.hasOwnProperty.call(exports, prop)) {\n      Object.defineProperty(globals, prop, {\n        value: exports[prop as (keyof 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\ No newline at end of file
diff --git a/node_modules/web-streams-polyfill/dist/polyfill.es6.mjs b/node_modules/web-streams-polyfill/dist/polyfill.es6.mjs
new file mode 100644
index 0000000..a405cd1
--- /dev/null
+++ b/node_modules/web-streams-polyfill/dist/polyfill.es6.mjs
@@ -0,0 +1,4230 @@
+/**
+ * web-streams-polyfill v3.2.1
+ */
+/// <reference lib="es2015.symbol" />
+const SymbolPolyfill = typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol' ?
+    Symbol :
+    description => `Symbol(${description})`;
+
+/// <reference lib="dom" />
+function noop() {
+    return undefined;
+}
+function getGlobals() {
+    if (typeof self !== 'undefined') {
+        return self;
+    }
+    else if (typeof window !== 'undefined') {
+        return window;
+    }
+    else if (typeof global !== 'undefined') {
+        return global;
+    }
+    return undefined;
+}
+const globals = getGlobals();
+
+function typeIsObject(x) {
+    return (typeof x === 'object' && x !== null) || typeof x === 'function';
+}
+const rethrowAssertionErrorRejection = noop;
+
+const originalPromise = Promise;
+const originalPromiseThen = Promise.prototype.then;
+const originalPromiseResolve = Promise.resolve.bind(originalPromise);
+const originalPromiseReject = Promise.reject.bind(originalPromise);
+function newPromise(executor) {
+    return new originalPromise(executor);
+}
+function promiseResolvedWith(value) {
+    return originalPromiseResolve(value);
+}
+function promiseRejectedWith(reason) {
+    return originalPromiseReject(reason);
+}
+function PerformPromiseThen(promise, onFulfilled, onRejected) {
+    // There doesn't appear to be any way to correctly emulate the behaviour from JavaScript, so this is just an
+    // approximation.
+    return originalPromiseThen.call(promise, onFulfilled, onRejected);
+}
+function uponPromise(promise, onFulfilled, onRejected) {
+    PerformPromiseThen(PerformPromiseThen(promise, onFulfilled, onRejected), undefined, rethrowAssertionErrorRejection);
+}
+function uponFulfillment(promise, onFulfilled) {
+    uponPromise(promise, onFulfilled);
+}
+function uponRejection(promise, onRejected) {
+    uponPromise(promise, undefined, onRejected);
+}
+function transformPromiseWith(promise, fulfillmentHandler, rejectionHandler) {
+    return PerformPromiseThen(promise, fulfillmentHandler, rejectionHandler);
+}
+function setPromiseIsHandledToTrue(promise) {
+    PerformPromiseThen(promise, undefined, rethrowAssertionErrorRejection);
+}
+const queueMicrotask = (() => {
+    const globalQueueMicrotask = globals && globals.queueMicrotask;
+    if (typeof globalQueueMicrotask === 'function') {
+        return globalQueueMicrotask;
+    }
+    const resolvedPromise = promiseResolvedWith(undefined);
+    return (fn) => PerformPromiseThen(resolvedPromise, fn);
+})();
+function reflectCall(F, V, args) {
+    if (typeof F !== 'function') {
+        throw new TypeError('Argument is not a function');
+    }
+    return Function.prototype.apply.call(F, V, args);
+}
+function promiseCall(F, V, args) {
+    try {
+        return promiseResolvedWith(reflectCall(F, V, args));
+    }
+    catch (value) {
+        return promiseRejectedWith(value);
+    }
+}
+
+// Original from Chromium
+// https://chromium.googlesource.com/chromium/src/+/0aee4434a4dba42a42abaea9bfbc0cd196a63bc1/third_party/blink/renderer/core/streams/SimpleQueue.js
+const QUEUE_MAX_ARRAY_SIZE = 16384;
+/**
+ * Simple queue structure.
+ *
+ * Avoids scalability issues with using a packed array directly by using
+ * multiple arrays in a linked list and keeping the array size bounded.
+ */
+class SimpleQueue {
+    constructor() {
+        this._cursor = 0;
+        this._size = 0;
+        // _front and _back are always defined.
+        this._front = {
+            _elements: [],
+            _next: undefined
+        };
+        this._back = this._front;
+        // The cursor is used to avoid calling Array.shift().
+        // It contains the index of the front element of the array inside the
+        // front-most node. It is always in the range [0, QUEUE_MAX_ARRAY_SIZE).
+        this._cursor = 0;
+        // When there is only one node, size === elements.length - cursor.
+        this._size = 0;
+    }
+    get length() {
+        return this._size;
+    }
+    // For exception safety, this method is structured in order:
+    // 1. Read state
+    // 2. Calculate required state mutations
+    // 3. Perform state mutations
+    push(element) {
+        const oldBack = this._back;
+        let newBack = oldBack;
+        if (oldBack._elements.length === QUEUE_MAX_ARRAY_SIZE - 1) {
+            newBack = {
+                _elements: [],
+                _next: undefined
+            };
+        }
+        // push() is the mutation most likely to throw an exception, so it
+        // goes first.
+        oldBack._elements.push(element);
+        if (newBack !== oldBack) {
+            this._back = newBack;
+            oldBack._next = newBack;
+        }
+        ++this._size;
+    }
+    // Like push(), shift() follows the read -> calculate -> mutate pattern for
+    // exception safety.
+    shift() { // must not be called on an empty queue
+        const oldFront = this._front;
+        let newFront = oldFront;
+        const oldCursor = this._cursor;
+        let newCursor = oldCursor + 1;
+        const elements = oldFront._elements;
+        const element = elements[oldCursor];
+        if (newCursor === QUEUE_MAX_ARRAY_SIZE) {
+            newFront = oldFront._next;
+            newCursor = 0;
+        }
+        // No mutations before this point.
+        --this._size;
+        this._cursor = newCursor;
+        if (oldFront !== newFront) {
+            this._front = newFront;
+        }
+        // Permit shifted element to be garbage collected.
+        elements[oldCursor] = undefined;
+        return element;
+    }
+    // The tricky thing about forEach() is that it can be called
+    // re-entrantly. The queue may be mutated inside the callback. It is easy to
+    // see that push() within the callback has no negative effects since the end
+    // of the queue is checked for on every iteration. If shift() is called
+    // repeatedly within the callback then the next iteration may return an
+    // element that has been removed. In this case the callback will be called
+    // with undefined values until we either "catch up" with elements that still
+    // exist or reach the back of the queue.
+    forEach(callback) {
+        let i = this._cursor;
+        let node = this._front;
+        let elements = node._elements;
+        while (i !== elements.length || node._next !== undefined) {
+            if (i === elements.length) {
+                node = node._next;
+                elements = node._elements;
+                i = 0;
+                if (elements.length === 0) {
+                    break;
+                }
+            }
+            callback(elements[i]);
+            ++i;
+        }
+    }
+    // Return the element that would be returned if shift() was called now,
+    // without modifying the queue.
+    peek() { // must not be called on an empty queue
+        const front = this._front;
+        const cursor = this._cursor;
+        return front._elements[cursor];
+    }
+}
+
+function ReadableStreamReaderGenericInitialize(reader, stream) {
+    reader._ownerReadableStream = stream;
+    stream._reader = reader;
+    if (stream._state === 'readable') {
+        defaultReaderClosedPromiseInitialize(reader);
+    }
+    else if (stream._state === 'closed') {
+        defaultReaderClosedPromiseInitializeAsResolved(reader);
+    }
+    else {
+        defaultReaderClosedPromiseInitializeAsRejected(reader, stream._storedError);
+    }
+}
+// A client of ReadableStreamDefaultReader and ReadableStreamBYOBReader may use these functions directly to bypass state
+// check.
+function ReadableStreamReaderGenericCancel(reader, reason) {
+    const stream = reader._ownerReadableStream;
+    return ReadableStreamCancel(stream, reason);
+}
+function ReadableStreamReaderGenericRelease(reader) {
+    if (reader._ownerReadableStream._state === 'readable') {
+        defaultReaderClosedPromiseReject(reader, new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));
+    }
+    else {
+        defaultReaderClosedPromiseResetToRejected(reader, new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));
+    }
+    reader._ownerReadableStream._reader = undefined;
+    reader._ownerReadableStream = undefined;
+}
+// Helper functions for the readers.
+function readerLockException(name) {
+    return new TypeError('Cannot ' + name + ' a stream using a released reader');
+}
+// Helper functions for the ReadableStreamDefaultReader.
+function defaultReaderClosedPromiseInitialize(reader) {
+    reader._closedPromise = newPromise((resolve, reject) => {
+        reader._closedPromise_resolve = resolve;
+        reader._closedPromise_reject = reject;
+    });
+}
+function defaultReaderClosedPromiseInitializeAsRejected(reader, reason) {
+    defaultReaderClosedPromiseInitialize(reader);
+    defaultReaderClosedPromiseReject(reader, reason);
+}
+function defaultReaderClosedPromiseInitializeAsResolved(reader) {
+    defaultReaderClosedPromiseInitialize(reader);
+    defaultReaderClosedPromiseResolve(reader);
+}
+function defaultReaderClosedPromiseReject(reader, reason) {
+    if (reader._closedPromise_reject === undefined) {
+        return;
+    }
+    setPromiseIsHandledToTrue(reader._closedPromise);
+    reader._closedPromise_reject(reason);
+    reader._closedPromise_resolve = undefined;
+    reader._closedPromise_reject = undefined;
+}
+function defaultReaderClosedPromiseResetToRejected(reader, reason) {
+    defaultReaderClosedPromiseInitializeAsRejected(reader, reason);
+}
+function defaultReaderClosedPromiseResolve(reader) {
+    if (reader._closedPromise_resolve === undefined) {
+        return;
+    }
+    reader._closedPromise_resolve(undefined);
+    reader._closedPromise_resolve = undefined;
+    reader._closedPromise_reject = undefined;
+}
+
+const AbortSteps = SymbolPolyfill('[[AbortSteps]]');
+const ErrorSteps = SymbolPolyfill('[[ErrorSteps]]');
+const CancelSteps = SymbolPolyfill('[[CancelSteps]]');
+const PullSteps = SymbolPolyfill('[[PullSteps]]');
+
+/// <reference lib="es2015.core" />
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite#Polyfill
+const NumberIsFinite = Number.isFinite || function (x) {
+    return typeof x === 'number' && isFinite(x);
+};
+
+/// <reference lib="es2015.core" />
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc#Polyfill
+const MathTrunc = Math.trunc || function (v) {
+    return v < 0 ? Math.ceil(v) : Math.floor(v);
+};
+
+// https://heycam.github.io/webidl/#idl-dictionaries
+function isDictionary(x) {
+    return typeof x === 'object' || typeof x === 'function';
+}
+function assertDictionary(obj, context) {
+    if (obj !== undefined && !isDictionary(obj)) {
+        throw new TypeError(`${context} is not an object.`);
+    }
+}
+// https://heycam.github.io/webidl/#idl-callback-functions
+function assertFunction(x, context) {
+    if (typeof x !== 'function') {
+        throw new TypeError(`${context} is not a function.`);
+    }
+}
+// https://heycam.github.io/webidl/#idl-object
+function isObject(x) {
+    return (typeof x === 'object' && x !== null) || typeof x === 'function';
+}
+function assertObject(x, context) {
+    if (!isObject(x)) {
+        throw new TypeError(`${context} is not an object.`);
+    }
+}
+function assertRequiredArgument(x, position, context) {
+    if (x === undefined) {
+        throw new TypeError(`Parameter ${position} is required in '${context}'.`);
+    }
+}
+function assertRequiredField(x, field, context) {
+    if (x === undefined) {
+        throw new TypeError(`${field} is required in '${context}'.`);
+    }
+}
+// https://heycam.github.io/webidl/#idl-unrestricted-double
+function convertUnrestrictedDouble(value) {
+    return Number(value);
+}
+function censorNegativeZero(x) {
+    return x === 0 ? 0 : x;
+}
+function integerPart(x) {
+    return censorNegativeZero(MathTrunc(x));
+}
+// https://heycam.github.io/webidl/#idl-unsigned-long-long
+function convertUnsignedLongLongWithEnforceRange(value, context) {
+    const lowerBound = 0;
+    const upperBound = Number.MAX_SAFE_INTEGER;
+    let x = Number(value);
+    x = censorNegativeZero(x);
+    if (!NumberIsFinite(x)) {
+        throw new TypeError(`${context} is not a finite number`);
+    }
+    x = integerPart(x);
+    if (x < lowerBound || x > upperBound) {
+        throw new TypeError(`${context} is outside the accepted range of ${lowerBound} to ${upperBound}, inclusive`);
+    }
+    if (!NumberIsFinite(x) || x === 0) {
+        return 0;
+    }
+    // TODO Use BigInt if supported?
+    // let xBigInt = BigInt(integerPart(x));
+    // xBigInt = BigInt.asUintN(64, xBigInt);
+    // return Number(xBigInt);
+    return x;
+}
+
+function assertReadableStream(x, context) {
+    if (!IsReadableStream(x)) {
+        throw new TypeError(`${context} is not a ReadableStream.`);
+    }
+}
+
+// Abstract operations for the ReadableStream.
+function AcquireReadableStreamDefaultReader(stream) {
+    return new ReadableStreamDefaultReader(stream);
+}
+// ReadableStream API exposed for controllers.
+function ReadableStreamAddReadRequest(stream, readRequest) {
+    stream._reader._readRequests.push(readRequest);
+}
+function ReadableStreamFulfillReadRequest(stream, chunk, done) {
+    const reader = stream._reader;
+    const readRequest = reader._readRequests.shift();
+    if (done) {
+        readRequest._closeSteps();
+    }
+    else {
+        readRequest._chunkSteps(chunk);
+    }
+}
+function ReadableStreamGetNumReadRequests(stream) {
+    return stream._reader._readRequests.length;
+}
+function ReadableStreamHasDefaultReader(stream) {
+    const reader = stream._reader;
+    if (reader === undefined) {
+        return false;
+    }
+    if (!IsReadableStreamDefaultReader(reader)) {
+        return false;
+    }
+    return true;
+}
+/**
+ * A default reader vended by a {@link ReadableStream}.
+ *
+ * @public
+ */
+class ReadableStreamDefaultReader {
+    constructor(stream) {
+        assertRequiredArgument(stream, 1, 'ReadableStreamDefaultReader');
+        assertReadableStream(stream, 'First parameter');
+        if (IsReadableStreamLocked(stream)) {
+            throw new TypeError('This stream has already been locked for exclusive reading by another reader');
+        }
+        ReadableStreamReaderGenericInitialize(this, stream);
+        this._readRequests = new SimpleQueue();
+    }
+    /**
+     * Returns a promise that will be fulfilled when the stream becomes closed,
+     * or rejected if the stream ever errors or the reader's lock is released before the stream finishes closing.
+     */
+    get closed() {
+        if (!IsReadableStreamDefaultReader(this)) {
+            return promiseRejectedWith(defaultReaderBrandCheckException('closed'));
+        }
+        return this._closedPromise;
+    }
+    /**
+     * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.
+     */
+    cancel(reason = undefined) {
+        if (!IsReadableStreamDefaultReader(this)) {
+            return promiseRejectedWith(defaultReaderBrandCheckException('cancel'));
+        }
+        if (this._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('cancel'));
+        }
+        return ReadableStreamReaderGenericCancel(this, reason);
+    }
+    /**
+     * Returns a promise that allows access to the next chunk from the stream's internal queue, if available.
+     *
+     * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.
+     */
+    read() {
+        if (!IsReadableStreamDefaultReader(this)) {
+            return promiseRejectedWith(defaultReaderBrandCheckException('read'));
+        }
+        if (this._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('read from'));
+        }
+        let resolvePromise;
+        let rejectPromise;
+        const promise = newPromise((resolve, reject) => {
+            resolvePromise = resolve;
+            rejectPromise = reject;
+        });
+        const readRequest = {
+            _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),
+            _closeSteps: () => resolvePromise({ value: undefined, done: true }),
+            _errorSteps: e => rejectPromise(e)
+        };
+        ReadableStreamDefaultReaderRead(this, readRequest);
+        return promise;
+    }
+    /**
+     * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.
+     * If the associated stream is errored when the lock is released, the reader will appear errored in the same way
+     * from now on; otherwise, the reader will appear closed.
+     *
+     * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by
+     * the reader's {@link ReadableStreamDefaultReader.read | read()} method has not yet been settled. Attempting to
+     * do so will throw a `TypeError` and leave the reader locked to the stream.
+     */
+    releaseLock() {
+        if (!IsReadableStreamDefaultReader(this)) {
+            throw defaultReaderBrandCheckException('releaseLock');
+        }
+        if (this._ownerReadableStream === undefined) {
+            return;
+        }
+        if (this._readRequests.length > 0) {
+            throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');
+        }
+        ReadableStreamReaderGenericRelease(this);
+    }
+}
+Object.defineProperties(ReadableStreamDefaultReader.prototype, {
+    cancel: { enumerable: true },
+    read: { enumerable: true },
+    releaseLock: { enumerable: true },
+    closed: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableStreamDefaultReader.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableStreamDefaultReader',
+        configurable: true
+    });
+}
+// Abstract operations for the readers.
+function IsReadableStreamDefaultReader(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_readRequests')) {
+        return false;
+    }
+    return x instanceof ReadableStreamDefaultReader;
+}
+function ReadableStreamDefaultReaderRead(reader, readRequest) {
+    const stream = reader._ownerReadableStream;
+    stream._disturbed = true;
+    if (stream._state === 'closed') {
+        readRequest._closeSteps();
+    }
+    else if (stream._state === 'errored') {
+        readRequest._errorSteps(stream._storedError);
+    }
+    else {
+        stream._readableStreamController[PullSteps](readRequest);
+    }
+}
+// Helper functions for the ReadableStreamDefaultReader.
+function defaultReaderBrandCheckException(name) {
+    return new TypeError(`ReadableStreamDefaultReader.prototype.${name} can only be used on a ReadableStreamDefaultReader`);
+}
+
+/// <reference lib="es2018.asynciterable" />
+let AsyncIteratorPrototype;
+if (typeof SymbolPolyfill.asyncIterator === 'symbol') {
+    // We're running inside a ES2018+ environment, but we're compiling to an older syntax.
+    // We cannot access %AsyncIteratorPrototype% without non-ES2018 syntax, but we can re-create it.
+    AsyncIteratorPrototype = {
+        // 25.1.3.1 %AsyncIteratorPrototype% [ @@asyncIterator ] ( )
+        // https://tc39.github.io/ecma262/#sec-asynciteratorprototype-asynciterator
+        [SymbolPolyfill.asyncIterator]() {
+            return this;
+        }
+    };
+    Object.defineProperty(AsyncIteratorPrototype, SymbolPolyfill.asyncIterator, { enumerable: false });
+}
+
+/// <reference lib="es2018.asynciterable" />
+class ReadableStreamAsyncIteratorImpl {
+    constructor(reader, preventCancel) {
+        this._ongoingPromise = undefined;
+        this._isFinished = false;
+        this._reader = reader;
+        this._preventCancel = preventCancel;
+    }
+    next() {
+        const nextSteps = () => this._nextSteps();
+        this._ongoingPromise = this._ongoingPromise ?
+            transformPromiseWith(this._ongoingPromise, nextSteps, nextSteps) :
+            nextSteps();
+        return this._ongoingPromise;
+    }
+    return(value) {
+        const returnSteps = () => this._returnSteps(value);
+        return this._ongoingPromise ?
+            transformPromiseWith(this._ongoingPromise, returnSteps, returnSteps) :
+            returnSteps();
+    }
+    _nextSteps() {
+        if (this._isFinished) {
+            return Promise.resolve({ value: undefined, done: true });
+        }
+        const reader = this._reader;
+        if (reader._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('iterate'));
+        }
+        let resolvePromise;
+        let rejectPromise;
+        const promise = newPromise((resolve, reject) => {
+            resolvePromise = resolve;
+            rejectPromise = reject;
+        });
+        const readRequest = {
+            _chunkSteps: chunk => {
+                this._ongoingPromise = undefined;
+                // This needs to be delayed by one microtask, otherwise we stop pulling too early which breaks a test.
+                // FIXME Is this a bug in the specification, or in the test?
+                queueMicrotask(() => resolvePromise({ value: chunk, done: false }));
+            },
+            _closeSteps: () => {
+                this._ongoingPromise = undefined;
+                this._isFinished = true;
+                ReadableStreamReaderGenericRelease(reader);
+                resolvePromise({ value: undefined, done: true });
+            },
+            _errorSteps: reason => {
+                this._ongoingPromise = undefined;
+                this._isFinished = true;
+                ReadableStreamReaderGenericRelease(reader);
+                rejectPromise(reason);
+            }
+        };
+        ReadableStreamDefaultReaderRead(reader, readRequest);
+        return promise;
+    }
+    _returnSteps(value) {
+        if (this._isFinished) {
+            return Promise.resolve({ value, done: true });
+        }
+        this._isFinished = true;
+        const reader = this._reader;
+        if (reader._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('finish iterating'));
+        }
+        if (!this._preventCancel) {
+            const result = ReadableStreamReaderGenericCancel(reader, value);
+            ReadableStreamReaderGenericRelease(reader);
+            return transformPromiseWith(result, () => ({ value, done: true }));
+        }
+        ReadableStreamReaderGenericRelease(reader);
+        return promiseResolvedWith({ value, done: true });
+    }
+}
+const ReadableStreamAsyncIteratorPrototype = {
+    next() {
+        if (!IsReadableStreamAsyncIterator(this)) {
+            return promiseRejectedWith(streamAsyncIteratorBrandCheckException('next'));
+        }
+        return this._asyncIteratorImpl.next();
+    },
+    return(value) {
+        if (!IsReadableStreamAsyncIterator(this)) {
+            return promiseRejectedWith(streamAsyncIteratorBrandCheckException('return'));
+        }
+        return this._asyncIteratorImpl.return(value);
+    }
+};
+if (AsyncIteratorPrototype !== undefined) {
+    Object.setPrototypeOf(ReadableStreamAsyncIteratorPrototype, AsyncIteratorPrototype);
+}
+// Abstract operations for the ReadableStream.
+function AcquireReadableStreamAsyncIterator(stream, preventCancel) {
+    const reader = AcquireReadableStreamDefaultReader(stream);
+    const impl = new ReadableStreamAsyncIteratorImpl(reader, preventCancel);
+    const iterator = Object.create(ReadableStreamAsyncIteratorPrototype);
+    iterator._asyncIteratorImpl = impl;
+    return iterator;
+}
+function IsReadableStreamAsyncIterator(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_asyncIteratorImpl')) {
+        return false;
+    }
+    try {
+        // noinspection SuspiciousTypeOfGuard
+        return x._asyncIteratorImpl instanceof
+            ReadableStreamAsyncIteratorImpl;
+    }
+    catch (_a) {
+        return false;
+    }
+}
+// Helper functions for the ReadableStream.
+function streamAsyncIteratorBrandCheckException(name) {
+    return new TypeError(`ReadableStreamAsyncIterator.${name} can only be used on a ReadableSteamAsyncIterator`);
+}
+
+/// <reference lib="es2015.core" />
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Polyfill
+const NumberIsNaN = Number.isNaN || function (x) {
+    // eslint-disable-next-line no-self-compare
+    return x !== x;
+};
+
+function CreateArrayFromList(elements) {
+    // We use arrays to represent lists, so this is basically a no-op.
+    // Do a slice though just in case we happen to depend on the unique-ness.
+    return elements.slice();
+}
+function CopyDataBlockBytes(dest, destOffset, src, srcOffset, n) {
+    new Uint8Array(dest).set(new Uint8Array(src, srcOffset, n), destOffset);
+}
+// Not implemented correctly
+function TransferArrayBuffer(O) {
+    return O;
+}
+// Not implemented correctly
+// eslint-disable-next-line @typescript-eslint/no-unused-vars
+function IsDetachedBuffer(O) {
+    return false;
+}
+function ArrayBufferSlice(buffer, begin, end) {
+    // ArrayBuffer.prototype.slice is not available on IE10
+    // https://www.caniuse.com/mdn-javascript_builtins_arraybuffer_slice
+    if (buffer.slice) {
+        return buffer.slice(begin, end);
+    }
+    const length = end - begin;
+    const slice = new ArrayBuffer(length);
+    CopyDataBlockBytes(slice, 0, buffer, begin, length);
+    return slice;
+}
+
+function IsNonNegativeNumber(v) {
+    if (typeof v !== 'number') {
+        return false;
+    }
+    if (NumberIsNaN(v)) {
+        return false;
+    }
+    if (v < 0) {
+        return false;
+    }
+    return true;
+}
+function CloneAsUint8Array(O) {
+    const buffer = ArrayBufferSlice(O.buffer, O.byteOffset, O.byteOffset + O.byteLength);
+    return new Uint8Array(buffer);
+}
+
+function DequeueValue(container) {
+    const pair = container._queue.shift();
+    container._queueTotalSize -= pair.size;
+    if (container._queueTotalSize < 0) {
+        container._queueTotalSize = 0;
+    }
+    return pair.value;
+}
+function EnqueueValueWithSize(container, value, size) {
+    if (!IsNonNegativeNumber(size) || size === Infinity) {
+        throw new RangeError('Size must be a finite, non-NaN, non-negative number.');
+    }
+    container._queue.push({ value, size });
+    container._queueTotalSize += size;
+}
+function PeekQueueValue(container) {
+    const pair = container._queue.peek();
+    return pair.value;
+}
+function ResetQueue(container) {
+    container._queue = new SimpleQueue();
+    container._queueTotalSize = 0;
+}
+
+/**
+ * A pull-into request in a {@link ReadableByteStreamController}.
+ *
+ * @public
+ */
+class ReadableStreamBYOBRequest {
+    constructor() {
+        throw new TypeError('Illegal constructor');
+    }
+    /**
+     * Returns the view for writing in to, or `null` if the BYOB request has already been responded to.
+     */
+    get view() {
+        if (!IsReadableStreamBYOBRequest(this)) {
+            throw byobRequestBrandCheckException('view');
+        }
+        return this._view;
+    }
+    respond(bytesWritten) {
+        if (!IsReadableStreamBYOBRequest(this)) {
+            throw byobRequestBrandCheckException('respond');
+        }
+        assertRequiredArgument(bytesWritten, 1, 'respond');
+        bytesWritten = convertUnsignedLongLongWithEnforceRange(bytesWritten, 'First parameter');
+        if (this._associatedReadableByteStreamController === undefined) {
+            throw new TypeError('This BYOB request has been invalidated');
+        }
+        if (IsDetachedBuffer(this._view.buffer)) ;
+        ReadableByteStreamControllerRespond(this._associatedReadableByteStreamController, bytesWritten);
+    }
+    respondWithNewView(view) {
+        if (!IsReadableStreamBYOBRequest(this)) {
+            throw byobRequestBrandCheckException('respondWithNewView');
+        }
+        assertRequiredArgument(view, 1, 'respondWithNewView');
+        if (!ArrayBuffer.isView(view)) {
+            throw new TypeError('You can only respond with array buffer views');
+        }
+        if (this._associatedReadableByteStreamController === undefined) {
+            throw new TypeError('This BYOB request has been invalidated');
+        }
+        if (IsDetachedBuffer(view.buffer)) ;
+        ReadableByteStreamControllerRespondWithNewView(this._associatedReadableByteStreamController, view);
+    }
+}
+Object.defineProperties(ReadableStreamBYOBRequest.prototype, {
+    respond: { enumerable: true },
+    respondWithNewView: { enumerable: true },
+    view: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableStreamBYOBRequest.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableStreamBYOBRequest',
+        configurable: true
+    });
+}
+/**
+ * Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue.
+ *
+ * @public
+ */
+class ReadableByteStreamController {
+    constructor() {
+        throw new TypeError('Illegal constructor');
+    }
+    /**
+     * Returns the current BYOB pull request, or `null` if there isn't one.
+     */
+    get byobRequest() {
+        if (!IsReadableByteStreamController(this)) {
+            throw byteStreamControllerBrandCheckException('byobRequest');
+        }
+        return ReadableByteStreamControllerGetBYOBRequest(this);
+    }
+    /**
+     * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is
+     * over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure.
+     */
+    get desiredSize() {
+        if (!IsReadableByteStreamController(this)) {
+            throw byteStreamControllerBrandCheckException('desiredSize');
+        }
+        return ReadableByteStreamControllerGetDesiredSize(this);
+    }
+    /**
+     * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from
+     * the stream, but once those are read, the stream will become closed.
+     */
+    close() {
+        if (!IsReadableByteStreamController(this)) {
+            throw byteStreamControllerBrandCheckException('close');
+        }
+        if (this._closeRequested) {
+            throw new TypeError('The stream has already been closed; do not close it again!');
+        }
+        const state = this._controlledReadableByteStream._state;
+        if (state !== 'readable') {
+            throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be closed`);
+        }
+        ReadableByteStreamControllerClose(this);
+    }
+    enqueue(chunk) {
+        if (!IsReadableByteStreamController(this)) {
+            throw byteStreamControllerBrandCheckException('enqueue');
+        }
+        assertRequiredArgument(chunk, 1, 'enqueue');
+        if (!ArrayBuffer.isView(chunk)) {
+            throw new TypeError('chunk must be an array buffer view');
+        }
+        if (chunk.byteLength === 0) {
+            throw new TypeError('chunk must have non-zero byteLength');
+        }
+        if (chunk.buffer.byteLength === 0) {
+            throw new TypeError(`chunk's buffer must have non-zero byteLength`);
+        }
+        if (this._closeRequested) {
+            throw new TypeError('stream is closed or draining');
+        }
+        const state = this._controlledReadableByteStream._state;
+        if (state !== 'readable') {
+            throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be enqueued to`);
+        }
+        ReadableByteStreamControllerEnqueue(this, chunk);
+    }
+    /**
+     * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.
+     */
+    error(e = undefined) {
+        if (!IsReadableByteStreamController(this)) {
+            throw byteStreamControllerBrandCheckException('error');
+        }
+        ReadableByteStreamControllerError(this, e);
+    }
+    /** @internal */
+    [CancelSteps](reason) {
+        ReadableByteStreamControllerClearPendingPullIntos(this);
+        ResetQueue(this);
+        const result = this._cancelAlgorithm(reason);
+        ReadableByteStreamControllerClearAlgorithms(this);
+        return result;
+    }
+    /** @internal */
+    [PullSteps](readRequest) {
+        const stream = this._controlledReadableByteStream;
+        if (this._queueTotalSize > 0) {
+            const entry = this._queue.shift();
+            this._queueTotalSize -= entry.byteLength;
+            ReadableByteStreamControllerHandleQueueDrain(this);
+            const view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);
+            readRequest._chunkSteps(view);
+            return;
+        }
+        const autoAllocateChunkSize = this._autoAllocateChunkSize;
+        if (autoAllocateChunkSize !== undefined) {
+            let buffer;
+            try {
+                buffer = new ArrayBuffer(autoAllocateChunkSize);
+            }
+            catch (bufferE) {
+                readRequest._errorSteps(bufferE);
+                return;
+            }
+            const pullIntoDescriptor = {
+                buffer,
+                bufferByteLength: autoAllocateChunkSize,
+                byteOffset: 0,
+                byteLength: autoAllocateChunkSize,
+                bytesFilled: 0,
+                elementSize: 1,
+                viewConstructor: Uint8Array,
+                readerType: 'default'
+            };
+            this._pendingPullIntos.push(pullIntoDescriptor);
+        }
+        ReadableStreamAddReadRequest(stream, readRequest);
+        ReadableByteStreamControllerCallPullIfNeeded(this);
+    }
+}
+Object.defineProperties(ReadableByteStreamController.prototype, {
+    close: { enumerable: true },
+    enqueue: { enumerable: true },
+    error: { enumerable: true },
+    byobRequest: { enumerable: true },
+    desiredSize: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableByteStreamController.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableByteStreamController',
+        configurable: true
+    });
+}
+// Abstract operations for the ReadableByteStreamController.
+function IsReadableByteStreamController(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableByteStream')) {
+        return false;
+    }
+    return x instanceof ReadableByteStreamController;
+}
+function IsReadableStreamBYOBRequest(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_associatedReadableByteStreamController')) {
+        return false;
+    }
+    return x instanceof ReadableStreamBYOBRequest;
+}
+function ReadableByteStreamControllerCallPullIfNeeded(controller) {
+    const shouldPull = ReadableByteStreamControllerShouldCallPull(controller);
+    if (!shouldPull) {
+        return;
+    }
+    if (controller._pulling) {
+        controller._pullAgain = true;
+        return;
+    }
+    controller._pulling = true;
+    // TODO: Test controller argument
+    const pullPromise = controller._pullAlgorithm();
+    uponPromise(pullPromise, () => {
+        controller._pulling = false;
+        if (controller._pullAgain) {
+            controller._pullAgain = false;
+            ReadableByteStreamControllerCallPullIfNeeded(controller);
+        }
+    }, e => {
+        ReadableByteStreamControllerError(controller, e);
+    });
+}
+function ReadableByteStreamControllerClearPendingPullIntos(controller) {
+    ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+    controller._pendingPullIntos = new SimpleQueue();
+}
+function ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor) {
+    let done = false;
+    if (stream._state === 'closed') {
+        done = true;
+    }
+    const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor);
+    if (pullIntoDescriptor.readerType === 'default') {
+        ReadableStreamFulfillReadRequest(stream, filledView, done);
+    }
+    else {
+        ReadableStreamFulfillReadIntoRequest(stream, filledView, done);
+    }
+}
+function ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor) {
+    const bytesFilled = pullIntoDescriptor.bytesFilled;
+    const elementSize = pullIntoDescriptor.elementSize;
+    return new pullIntoDescriptor.viewConstructor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize);
+}
+function ReadableByteStreamControllerEnqueueChunkToQueue(controller, buffer, byteOffset, byteLength) {
+    controller._queue.push({ buffer, byteOffset, byteLength });
+    controller._queueTotalSize += byteLength;
+}
+function ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor) {
+    const elementSize = pullIntoDescriptor.elementSize;
+    const currentAlignedBytes = pullIntoDescriptor.bytesFilled - pullIntoDescriptor.bytesFilled % elementSize;
+    const maxBytesToCopy = Math.min(controller._queueTotalSize, pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled);
+    const maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;
+    const maxAlignedBytes = maxBytesFilled - maxBytesFilled % elementSize;
+    let totalBytesToCopyRemaining = maxBytesToCopy;
+    let ready = false;
+    if (maxAlignedBytes > currentAlignedBytes) {
+        totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled;
+        ready = true;
+    }
+    const queue = controller._queue;
+    while (totalBytesToCopyRemaining > 0) {
+        const headOfQueue = queue.peek();
+        const bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength);
+        const destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;
+        CopyDataBlockBytes(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy);
+        if (headOfQueue.byteLength === bytesToCopy) {
+            queue.shift();
+        }
+        else {
+            headOfQueue.byteOffset += bytesToCopy;
+            headOfQueue.byteLength -= bytesToCopy;
+        }
+        controller._queueTotalSize -= bytesToCopy;
+        ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor);
+        totalBytesToCopyRemaining -= bytesToCopy;
+    }
+    return ready;
+}
+function ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, size, pullIntoDescriptor) {
+    pullIntoDescriptor.bytesFilled += size;
+}
+function ReadableByteStreamControllerHandleQueueDrain(controller) {
+    if (controller._queueTotalSize === 0 && controller._closeRequested) {
+        ReadableByteStreamControllerClearAlgorithms(controller);
+        ReadableStreamClose(controller._controlledReadableByteStream);
+    }
+    else {
+        ReadableByteStreamControllerCallPullIfNeeded(controller);
+    }
+}
+function ReadableByteStreamControllerInvalidateBYOBRequest(controller) {
+    if (controller._byobRequest === null) {
+        return;
+    }
+    controller._byobRequest._associatedReadableByteStreamController = undefined;
+    controller._byobRequest._view = null;
+    controller._byobRequest = null;
+}
+function ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller) {
+    while (controller._pendingPullIntos.length > 0) {
+        if (controller._queueTotalSize === 0) {
+            return;
+        }
+        const pullIntoDescriptor = controller._pendingPullIntos.peek();
+        if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {
+            ReadableByteStreamControllerShiftPendingPullInto(controller);
+            ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);
+        }
+    }
+}
+function ReadableByteStreamControllerPullInto(controller, view, readIntoRequest) {
+    const stream = controller._controlledReadableByteStream;
+    let elementSize = 1;
+    if (view.constructor !== DataView) {
+        elementSize = view.constructor.BYTES_PER_ELEMENT;
+    }
+    const ctor = view.constructor;
+    // try {
+    const buffer = TransferArrayBuffer(view.buffer);
+    // } catch (e) {
+    //   readIntoRequest._errorSteps(e);
+    //   return;
+    // }
+    const pullIntoDescriptor = {
+        buffer,
+        bufferByteLength: buffer.byteLength,
+        byteOffset: view.byteOffset,
+        byteLength: view.byteLength,
+        bytesFilled: 0,
+        elementSize,
+        viewConstructor: ctor,
+        readerType: 'byob'
+    };
+    if (controller._pendingPullIntos.length > 0) {
+        controller._pendingPullIntos.push(pullIntoDescriptor);
+        // No ReadableByteStreamControllerCallPullIfNeeded() call since:
+        // - No change happens on desiredSize
+        // - The source has already been notified of that there's at least 1 pending read(view)
+        ReadableStreamAddReadIntoRequest(stream, readIntoRequest);
+        return;
+    }
+    if (stream._state === 'closed') {
+        const emptyView = new ctor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0);
+        readIntoRequest._closeSteps(emptyView);
+        return;
+    }
+    if (controller._queueTotalSize > 0) {
+        if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {
+            const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor);
+            ReadableByteStreamControllerHandleQueueDrain(controller);
+            readIntoRequest._chunkSteps(filledView);
+            return;
+        }
+        if (controller._closeRequested) {
+            const e = new TypeError('Insufficient bytes to fill elements in the given buffer');
+            ReadableByteStreamControllerError(controller, e);
+            readIntoRequest._errorSteps(e);
+            return;
+        }
+    }
+    controller._pendingPullIntos.push(pullIntoDescriptor);
+    ReadableStreamAddReadIntoRequest(stream, readIntoRequest);
+    ReadableByteStreamControllerCallPullIfNeeded(controller);
+}
+function ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor) {
+    const stream = controller._controlledReadableByteStream;
+    if (ReadableStreamHasBYOBReader(stream)) {
+        while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {
+            const pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);
+            ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);
+        }
+    }
+}
+function ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, pullIntoDescriptor) {
+    ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor);
+    if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {
+        return;
+    }
+    ReadableByteStreamControllerShiftPendingPullInto(controller);
+    const remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize;
+    if (remainderSize > 0) {
+        const end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;
+        const remainder = ArrayBufferSlice(pullIntoDescriptor.buffer, end - remainderSize, end);
+        ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength);
+    }
+    pullIntoDescriptor.bytesFilled -= remainderSize;
+    ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);
+    ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);
+}
+function ReadableByteStreamControllerRespondInternal(controller, bytesWritten) {
+    const firstDescriptor = controller._pendingPullIntos.peek();
+    ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+    const state = controller._controlledReadableByteStream._state;
+    if (state === 'closed') {
+        ReadableByteStreamControllerRespondInClosedState(controller);
+    }
+    else {
+        ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);
+    }
+    ReadableByteStreamControllerCallPullIfNeeded(controller);
+}
+function ReadableByteStreamControllerShiftPendingPullInto(controller) {
+    const descriptor = controller._pendingPullIntos.shift();
+    return descriptor;
+}
+function ReadableByteStreamControllerShouldCallPull(controller) {
+    const stream = controller._controlledReadableByteStream;
+    if (stream._state !== 'readable') {
+        return false;
+    }
+    if (controller._closeRequested) {
+        return false;
+    }
+    if (!controller._started) {
+        return false;
+    }
+    if (ReadableStreamHasDefaultReader(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+        return true;
+    }
+    if (ReadableStreamHasBYOBReader(stream) && ReadableStreamGetNumReadIntoRequests(stream) > 0) {
+        return true;
+    }
+    const desiredSize = ReadableByteStreamControllerGetDesiredSize(controller);
+    if (desiredSize > 0) {
+        return true;
+    }
+    return false;
+}
+function ReadableByteStreamControllerClearAlgorithms(controller) {
+    controller._pullAlgorithm = undefined;
+    controller._cancelAlgorithm = undefined;
+}
+// A client of ReadableByteStreamController may use these functions directly to bypass state check.
+function ReadableByteStreamControllerClose(controller) {
+    const stream = controller._controlledReadableByteStream;
+    if (controller._closeRequested || stream._state !== 'readable') {
+        return;
+    }
+    if (controller._queueTotalSize > 0) {
+        controller._closeRequested = true;
+        return;
+    }
+    if (controller._pendingPullIntos.length > 0) {
+        const firstPendingPullInto = controller._pendingPullIntos.peek();
+        if (firstPendingPullInto.bytesFilled > 0) {
+            const e = new TypeError('Insufficient bytes to fill elements in the given buffer');
+            ReadableByteStreamControllerError(controller, e);
+            throw e;
+        }
+    }
+    ReadableByteStreamControllerClearAlgorithms(controller);
+    ReadableStreamClose(stream);
+}
+function ReadableByteStreamControllerEnqueue(controller, chunk) {
+    const stream = controller._controlledReadableByteStream;
+    if (controller._closeRequested || stream._state !== 'readable') {
+        return;
+    }
+    const buffer = chunk.buffer;
+    const byteOffset = chunk.byteOffset;
+    const byteLength = chunk.byteLength;
+    const transferredBuffer = TransferArrayBuffer(buffer);
+    if (controller._pendingPullIntos.length > 0) {
+        const firstPendingPullInto = controller._pendingPullIntos.peek();
+        if (IsDetachedBuffer(firstPendingPullInto.buffer)) ;
+        firstPendingPullInto.buffer = TransferArrayBuffer(firstPendingPullInto.buffer);
+    }
+    ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+    if (ReadableStreamHasDefaultReader(stream)) {
+        if (ReadableStreamGetNumReadRequests(stream) === 0) {
+            ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+        }
+        else {
+            if (controller._pendingPullIntos.length > 0) {
+                ReadableByteStreamControllerShiftPendingPullInto(controller);
+            }
+            const transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength);
+            ReadableStreamFulfillReadRequest(stream, transferredView, false);
+        }
+    }
+    else if (ReadableStreamHasBYOBReader(stream)) {
+        // TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully.
+        ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+        ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);
+    }
+    else {
+        ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+    }
+    ReadableByteStreamControllerCallPullIfNeeded(controller);
+}
+function ReadableByteStreamControllerError(controller, e) {
+    const stream = controller._controlledReadableByteStream;
+    if (stream._state !== 'readable') {
+        return;
+    }
+    ReadableByteStreamControllerClearPendingPullIntos(controller);
+    ResetQueue(controller);
+    ReadableByteStreamControllerClearAlgorithms(controller);
+    ReadableStreamError(stream, e);
+}
+function ReadableByteStreamControllerGetBYOBRequest(controller) {
+    if (controller._byobRequest === null && controller._pendingPullIntos.length > 0) {
+        const firstDescriptor = controller._pendingPullIntos.peek();
+        const view = new Uint8Array(firstDescriptor.buffer, firstDescriptor.byteOffset + firstDescriptor.bytesFilled, firstDescriptor.byteLength - firstDescriptor.bytesFilled);
+        const byobRequest = Object.create(ReadableStreamBYOBRequest.prototype);
+        SetUpReadableStreamBYOBRequest(byobRequest, controller, view);
+        controller._byobRequest = byobRequest;
+    }
+    return controller._byobRequest;
+}
+function ReadableByteStreamControllerGetDesiredSize(controller) {
+    const state = controller._controlledReadableByteStream._state;
+    if (state === 'errored') {
+        return null;
+    }
+    if (state === 'closed') {
+        return 0;
+    }
+    return controller._strategyHWM - controller._queueTotalSize;
+}
+function ReadableByteStreamControllerRespond(controller, bytesWritten) {
+    const firstDescriptor = controller._pendingPullIntos.peek();
+    const state = controller._controlledReadableByteStream._state;
+    if (state === 'closed') {
+        if (bytesWritten !== 0) {
+            throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream');
+        }
+    }
+    else {
+        if (bytesWritten === 0) {
+            throw new TypeError('bytesWritten must be greater than 0 when calling respond() on a readable stream');
+        }
+        if (firstDescriptor.bytesFilled + bytesWritten > firstDescriptor.byteLength) {
+            throw new RangeError('bytesWritten out of range');
+        }
+    }
+    firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer);
+    ReadableByteStreamControllerRespondInternal(controller, bytesWritten);
+}
+function ReadableByteStreamControllerRespondWithNewView(controller, view) {
+    const firstDescriptor = controller._pendingPullIntos.peek();
+    const state = controller._controlledReadableByteStream._state;
+    if (state === 'closed') {
+        if (view.byteLength !== 0) {
+            throw new TypeError('The view\'s length must be 0 when calling respondWithNewView() on a closed stream');
+        }
+    }
+    else {
+        if (view.byteLength === 0) {
+            throw new TypeError('The view\'s length must be greater than 0 when calling respondWithNewView() on a readable stream');
+        }
+    }
+    if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) {
+        throw new RangeError('The region specified by view does not match byobRequest');
+    }
+    if (firstDescriptor.bufferByteLength !== view.buffer.byteLength) {
+        throw new RangeError('The buffer of view has different capacity than byobRequest');
+    }
+    if (firstDescriptor.bytesFilled + view.byteLength > firstDescriptor.byteLength) {
+        throw new RangeError('The region specified by view is larger than byobRequest');
+    }
+    const viewByteLength = view.byteLength;
+    firstDescriptor.buffer = TransferArrayBuffer(view.buffer);
+    ReadableByteStreamControllerRespondInternal(controller, viewByteLength);
+}
+function SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize) {
+    controller._controlledReadableByteStream = stream;
+    controller._pullAgain = false;
+    controller._pulling = false;
+    controller._byobRequest = null;
+    // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.
+    controller._queue = controller._queueTotalSize = undefined;
+    ResetQueue(controller);
+    controller._closeRequested = false;
+    controller._started = false;
+    controller._strategyHWM = highWaterMark;
+    controller._pullAlgorithm = pullAlgorithm;
+    controller._cancelAlgorithm = cancelAlgorithm;
+    controller._autoAllocateChunkSize = autoAllocateChunkSize;
+    controller._pendingPullIntos = new SimpleQueue();
+    stream._readableStreamController = controller;
+    const startResult = startAlgorithm();
+    uponPromise(promiseResolvedWith(startResult), () => {
+        controller._started = true;
+        ReadableByteStreamControllerCallPullIfNeeded(controller);
+    }, r => {
+        ReadableByteStreamControllerError(controller, r);
+    });
+}
+function SetUpReadableByteStreamControllerFromUnderlyingSource(stream, underlyingByteSource, highWaterMark) {
+    const controller = Object.create(ReadableByteStreamController.prototype);
+    let startAlgorithm = () => undefined;
+    let pullAlgorithm = () => promiseResolvedWith(undefined);
+    let cancelAlgorithm = () => promiseResolvedWith(undefined);
+    if (underlyingByteSource.start !== undefined) {
+        startAlgorithm = () => underlyingByteSource.start(controller);
+    }
+    if (underlyingByteSource.pull !== undefined) {
+        pullAlgorithm = () => underlyingByteSource.pull(controller);
+    }
+    if (underlyingByteSource.cancel !== undefined) {
+        cancelAlgorithm = reason => underlyingByteSource.cancel(reason);
+    }
+    const autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;
+    if (autoAllocateChunkSize === 0) {
+        throw new TypeError('autoAllocateChunkSize must be greater than 0');
+    }
+    SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize);
+}
+function SetUpReadableStreamBYOBRequest(request, controller, view) {
+    request._associatedReadableByteStreamController = controller;
+    request._view = view;
+}
+// Helper functions for the ReadableStreamBYOBRequest.
+function byobRequestBrandCheckException(name) {
+    return new TypeError(`ReadableStreamBYOBRequest.prototype.${name} can only be used on a ReadableStreamBYOBRequest`);
+}
+// Helper functions for the ReadableByteStreamController.
+function byteStreamControllerBrandCheckException(name) {
+    return new TypeError(`ReadableByteStreamController.prototype.${name} can only be used on a ReadableByteStreamController`);
+}
+
+// Abstract operations for the ReadableStream.
+function AcquireReadableStreamBYOBReader(stream) {
+    return new ReadableStreamBYOBReader(stream);
+}
+// ReadableStream API exposed for controllers.
+function ReadableStreamAddReadIntoRequest(stream, readIntoRequest) {
+    stream._reader._readIntoRequests.push(readIntoRequest);
+}
+function ReadableStreamFulfillReadIntoRequest(stream, chunk, done) {
+    const reader = stream._reader;
+    const readIntoRequest = reader._readIntoRequests.shift();
+    if (done) {
+        readIntoRequest._closeSteps(chunk);
+    }
+    else {
+        readIntoRequest._chunkSteps(chunk);
+    }
+}
+function ReadableStreamGetNumReadIntoRequests(stream) {
+    return stream._reader._readIntoRequests.length;
+}
+function ReadableStreamHasBYOBReader(stream) {
+    const reader = stream._reader;
+    if (reader === undefined) {
+        return false;
+    }
+    if (!IsReadableStreamBYOBReader(reader)) {
+        return false;
+    }
+    return true;
+}
+/**
+ * A BYOB reader vended by a {@link ReadableStream}.
+ *
+ * @public
+ */
+class ReadableStreamBYOBReader {
+    constructor(stream) {
+        assertRequiredArgument(stream, 1, 'ReadableStreamBYOBReader');
+        assertReadableStream(stream, 'First parameter');
+        if (IsReadableStreamLocked(stream)) {
+            throw new TypeError('This stream has already been locked for exclusive reading by another reader');
+        }
+        if (!IsReadableByteStreamController(stream._readableStreamController)) {
+            throw new TypeError('Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte ' +
+                'source');
+        }
+        ReadableStreamReaderGenericInitialize(this, stream);
+        this._readIntoRequests = new SimpleQueue();
+    }
+    /**
+     * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or
+     * the reader's lock is released before the stream finishes closing.
+     */
+    get closed() {
+        if (!IsReadableStreamBYOBReader(this)) {
+            return promiseRejectedWith(byobReaderBrandCheckException('closed'));
+        }
+        return this._closedPromise;
+    }
+    /**
+     * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.
+     */
+    cancel(reason = undefined) {
+        if (!IsReadableStreamBYOBReader(this)) {
+            return promiseRejectedWith(byobReaderBrandCheckException('cancel'));
+        }
+        if (this._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('cancel'));
+        }
+        return ReadableStreamReaderGenericCancel(this, reason);
+    }
+    /**
+     * Attempts to reads bytes into view, and returns a promise resolved with the result.
+     *
+     * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.
+     */
+    read(view) {
+        if (!IsReadableStreamBYOBReader(this)) {
+            return promiseRejectedWith(byobReaderBrandCheckException('read'));
+        }
+        if (!ArrayBuffer.isView(view)) {
+            return promiseRejectedWith(new TypeError('view must be an array buffer view'));
+        }
+        if (view.byteLength === 0) {
+            return promiseRejectedWith(new TypeError('view must have non-zero byteLength'));
+        }
+        if (view.buffer.byteLength === 0) {
+            return promiseRejectedWith(new TypeError(`view's buffer must have non-zero byteLength`));
+        }
+        if (IsDetachedBuffer(view.buffer)) ;
+        if (this._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('read from'));
+        }
+        let resolvePromise;
+        let rejectPromise;
+        const promise = newPromise((resolve, reject) => {
+            resolvePromise = resolve;
+            rejectPromise = reject;
+        });
+        const readIntoRequest = {
+            _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),
+            _closeSteps: chunk => resolvePromise({ value: chunk, done: true }),
+            _errorSteps: e => rejectPromise(e)
+        };
+        ReadableStreamBYOBReaderRead(this, view, readIntoRequest);
+        return promise;
+    }
+    /**
+     * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.
+     * If the associated stream is errored when the lock is released, the reader will appear errored in the same way
+     * from now on; otherwise, the reader will appear closed.
+     *
+     * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by
+     * the reader's {@link ReadableStreamBYOBReader.read | read()} method has not yet been settled. Attempting to
+     * do so will throw a `TypeError` and leave the reader locked to the stream.
+     */
+    releaseLock() {
+        if (!IsReadableStreamBYOBReader(this)) {
+            throw byobReaderBrandCheckException('releaseLock');
+        }
+        if (this._ownerReadableStream === undefined) {
+            return;
+        }
+        if (this._readIntoRequests.length > 0) {
+            throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');
+        }
+        ReadableStreamReaderGenericRelease(this);
+    }
+}
+Object.defineProperties(ReadableStreamBYOBReader.prototype, {
+    cancel: { enumerable: true },
+    read: { enumerable: true },
+    releaseLock: { enumerable: true },
+    closed: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableStreamBYOBReader.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableStreamBYOBReader',
+        configurable: true
+    });
+}
+// Abstract operations for the readers.
+function IsReadableStreamBYOBReader(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_readIntoRequests')) {
+        return false;
+    }
+    return x instanceof ReadableStreamBYOBReader;
+}
+function ReadableStreamBYOBReaderRead(reader, view, readIntoRequest) {
+    const stream = reader._ownerReadableStream;
+    stream._disturbed = true;
+    if (stream._state === 'errored') {
+        readIntoRequest._errorSteps(stream._storedError);
+    }
+    else {
+        ReadableByteStreamControllerPullInto(stream._readableStreamController, view, readIntoRequest);
+    }
+}
+// Helper functions for the ReadableStreamBYOBReader.
+function byobReaderBrandCheckException(name) {
+    return new TypeError(`ReadableStreamBYOBReader.prototype.${name} can only be used on a ReadableStreamBYOBReader`);
+}
+
+function ExtractHighWaterMark(strategy, defaultHWM) {
+    const { highWaterMark } = strategy;
+    if (highWaterMark === undefined) {
+        return defaultHWM;
+    }
+    if (NumberIsNaN(highWaterMark) || highWaterMark < 0) {
+        throw new RangeError('Invalid highWaterMark');
+    }
+    return highWaterMark;
+}
+function ExtractSizeAlgorithm(strategy) {
+    const { size } = strategy;
+    if (!size) {
+        return () => 1;
+    }
+    return size;
+}
+
+function convertQueuingStrategy(init, context) {
+    assertDictionary(init, context);
+    const highWaterMark = init === null || init === void 0 ? void 0 : init.highWaterMark;
+    const size = init === null || init === void 0 ? void 0 : init.size;
+    return {
+        highWaterMark: highWaterMark === undefined ? undefined : convertUnrestrictedDouble(highWaterMark),
+        size: size === undefined ? undefined : convertQueuingStrategySize(size, `${context} has member 'size' that`)
+    };
+}
+function convertQueuingStrategySize(fn, context) {
+    assertFunction(fn, context);
+    return chunk => convertUnrestrictedDouble(fn(chunk));
+}
+
+function convertUnderlyingSink(original, context) {
+    assertDictionary(original, context);
+    const abort = original === null || original === void 0 ? void 0 : original.abort;
+    const close = original === null || original === void 0 ? void 0 : original.close;
+    const start = original === null || original === void 0 ? void 0 : original.start;
+    const type = original === null || original === void 0 ? void 0 : original.type;
+    const write = original === null || original === void 0 ? void 0 : original.write;
+    return {
+        abort: abort === undefined ?
+            undefined :
+            convertUnderlyingSinkAbortCallback(abort, original, `${context} has member 'abort' that`),
+        close: close === undefined ?
+            undefined :
+            convertUnderlyingSinkCloseCallback(close, original, `${context} has member 'close' that`),
+        start: start === undefined ?
+            undefined :
+            convertUnderlyingSinkStartCallback(start, original, `${context} has member 'start' that`),
+        write: write === undefined ?
+            undefined :
+            convertUnderlyingSinkWriteCallback(write, original, `${context} has member 'write' that`),
+        type
+    };
+}
+function convertUnderlyingSinkAbortCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (reason) => promiseCall(fn, original, [reason]);
+}
+function convertUnderlyingSinkCloseCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return () => promiseCall(fn, original, []);
+}
+function convertUnderlyingSinkStartCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (controller) => reflectCall(fn, original, [controller]);
+}
+function convertUnderlyingSinkWriteCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (chunk, controller) => promiseCall(fn, original, [chunk, controller]);
+}
+
+function assertWritableStream(x, context) {
+    if (!IsWritableStream(x)) {
+        throw new TypeError(`${context} is not a WritableStream.`);
+    }
+}
+
+function isAbortSignal(value) {
+    if (typeof value !== 'object' || value === null) {
+        return false;
+    }
+    try {
+        return typeof value.aborted === 'boolean';
+    }
+    catch (_a) {
+        // AbortSignal.prototype.aborted throws if its brand check fails
+        return false;
+    }
+}
+const supportsAbortController = typeof AbortController === 'function';
+/**
+ * Construct a new AbortController, if supported by the platform.
+ *
+ * @internal
+ */
+function createAbortController() {
+    if (supportsAbortController) {
+        return new AbortController();
+    }
+    return undefined;
+}
+
+/**
+ * A writable stream represents a destination for data, into which you can write.
+ *
+ * @public
+ */
+class WritableStream {
+    constructor(rawUnderlyingSink = {}, rawStrategy = {}) {
+        if (rawUnderlyingSink === undefined) {
+            rawUnderlyingSink = null;
+        }
+        else {
+            assertObject(rawUnderlyingSink, 'First parameter');
+        }
+        const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');
+        const underlyingSink = convertUnderlyingSink(rawUnderlyingSink, 'First parameter');
+        InitializeWritableStream(this);
+        const type = underlyingSink.type;
+        if (type !== undefined) {
+            throw new RangeError('Invalid type is specified');
+        }
+        const sizeAlgorithm = ExtractSizeAlgorithm(strategy);
+        const highWaterMark = ExtractHighWaterMark(strategy, 1);
+        SetUpWritableStreamDefaultControllerFromUnderlyingSink(this, underlyingSink, highWaterMark, sizeAlgorithm);
+    }
+    /**
+     * Returns whether or not the writable stream is locked to a writer.
+     */
+    get locked() {
+        if (!IsWritableStream(this)) {
+            throw streamBrandCheckException$2('locked');
+        }
+        return IsWritableStreamLocked(this);
+    }
+    /**
+     * Aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be
+     * immediately moved to an errored state, with any queued-up writes discarded. This will also execute any abort
+     * mechanism of the underlying sink.
+     *
+     * The returned promise will fulfill if the stream shuts down successfully, or reject if the underlying sink signaled
+     * that there was an error doing so. Additionally, it will reject with a `TypeError` (without attempting to cancel
+     * the stream) if the stream is currently locked.
+     */
+    abort(reason = undefined) {
+        if (!IsWritableStream(this)) {
+            return promiseRejectedWith(streamBrandCheckException$2('abort'));
+        }
+        if (IsWritableStreamLocked(this)) {
+            return promiseRejectedWith(new TypeError('Cannot abort a stream that already has a writer'));
+        }
+        return WritableStreamAbort(this, reason);
+    }
+    /**
+     * Closes the stream. The underlying sink will finish processing any previously-written chunks, before invoking its
+     * close behavior. During this time any further attempts to write will fail (without erroring the stream).
+     *
+     * The method returns a promise that will fulfill if all remaining chunks are successfully written and the stream
+     * successfully closes, or rejects if an error is encountered during this process. Additionally, it will reject with
+     * a `TypeError` (without attempting to cancel the stream) if the stream is currently locked.
+     */
+    close() {
+        if (!IsWritableStream(this)) {
+            return promiseRejectedWith(streamBrandCheckException$2('close'));
+        }
+        if (IsWritableStreamLocked(this)) {
+            return promiseRejectedWith(new TypeError('Cannot close a stream that already has a writer'));
+        }
+        if (WritableStreamCloseQueuedOrInFlight(this)) {
+            return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));
+        }
+        return WritableStreamClose(this);
+    }
+    /**
+     * Creates a {@link WritableStreamDefaultWriter | writer} and locks the stream to the new writer. While the stream
+     * is locked, no other writer can be acquired until this one is released.
+     *
+     * This functionality is especially useful for creating abstractions that desire the ability to write to a stream
+     * without interruption or interleaving. By getting a writer for the stream, you can ensure nobody else can write at
+     * the same time, which would cause the resulting written data to be unpredictable and probably useless.
+     */
+    getWriter() {
+        if (!IsWritableStream(this)) {
+            throw streamBrandCheckException$2('getWriter');
+        }
+        return AcquireWritableStreamDefaultWriter(this);
+    }
+}
+Object.defineProperties(WritableStream.prototype, {
+    abort: { enumerable: true },
+    close: { enumerable: true },
+    getWriter: { enumerable: true },
+    locked: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(WritableStream.prototype, SymbolPolyfill.toStringTag, {
+        value: 'WritableStream',
+        configurable: true
+    });
+}
+// Abstract operations for the WritableStream.
+function AcquireWritableStreamDefaultWriter(stream) {
+    return new WritableStreamDefaultWriter(stream);
+}
+// Throws if and only if startAlgorithm throws.
+function CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark = 1, sizeAlgorithm = () => 1) {
+    const stream = Object.create(WritableStream.prototype);
+    InitializeWritableStream(stream);
+    const controller = Object.create(WritableStreamDefaultController.prototype);
+    SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm);
+    return stream;
+}
+function InitializeWritableStream(stream) {
+    stream._state = 'writable';
+    // The error that will be reported by new method calls once the state becomes errored. Only set when [[state]] is
+    // 'erroring' or 'errored'. May be set to an undefined value.
+    stream._storedError = undefined;
+    stream._writer = undefined;
+    // Initialize to undefined first because the constructor of the controller checks this
+    // variable to validate the caller.
+    stream._writableStreamController = undefined;
+    // This queue is placed here instead of the writer class in order to allow for passing a writer to the next data
+    // producer without waiting for the queued writes to finish.
+    stream._writeRequests = new SimpleQueue();
+    // Write requests are removed from _writeRequests when write() is called on the underlying sink. This prevents
+    // them from being erroneously rejected on error. If a write() call is in-flight, the request is stored here.
+    stream._inFlightWriteRequest = undefined;
+    // The promise that was returned from writer.close(). Stored here because it may be fulfilled after the writer
+    // has been detached.
+    stream._closeRequest = undefined;
+    // Close request is removed from _closeRequest when close() is called on the underlying sink. This prevents it
+    // from being erroneously rejected on error. If a close() call is in-flight, the request is stored here.
+    stream._inFlightCloseRequest = undefined;
+    // The promise that was returned from writer.abort(). This may also be fulfilled after the writer has detached.
+    stream._pendingAbortRequest = undefined;
+    // The backpressure signal set by the controller.
+    stream._backpressure = false;
+}
+function IsWritableStream(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_writableStreamController')) {
+        return false;
+    }
+    return x instanceof WritableStream;
+}
+function IsWritableStreamLocked(stream) {
+    if (stream._writer === undefined) {
+        return false;
+    }
+    return true;
+}
+function WritableStreamAbort(stream, reason) {
+    var _a;
+    if (stream._state === 'closed' || stream._state === 'errored') {
+        return promiseResolvedWith(undefined);
+    }
+    stream._writableStreamController._abortReason = reason;
+    (_a = stream._writableStreamController._abortController) === null || _a === void 0 ? void 0 : _a.abort();
+    // TypeScript narrows the type of `stream._state` down to 'writable' | 'erroring',
+    // but it doesn't know that signaling abort runs author code that might have changed the state.
+    // Widen the type again by casting to WritableStreamState.
+    const state = stream._state;
+    if (state === 'closed' || state === 'errored') {
+        return promiseResolvedWith(undefined);
+    }
+    if (stream._pendingAbortRequest !== undefined) {
+        return stream._pendingAbortRequest._promise;
+    }
+    let wasAlreadyErroring = false;
+    if (state === 'erroring') {
+        wasAlreadyErroring = true;
+        // reason will not be used, so don't keep a reference to it.
+        reason = undefined;
+    }
+    const promise = newPromise((resolve, reject) => {
+        stream._pendingAbortRequest = {
+            _promise: undefined,
+            _resolve: resolve,
+            _reject: reject,
+            _reason: reason,
+            _wasAlreadyErroring: wasAlreadyErroring
+        };
+    });
+    stream._pendingAbortRequest._promise = promise;
+    if (!wasAlreadyErroring) {
+        WritableStreamStartErroring(stream, reason);
+    }
+    return promise;
+}
+function WritableStreamClose(stream) {
+    const state = stream._state;
+    if (state === 'closed' || state === 'errored') {
+        return promiseRejectedWith(new TypeError(`The stream (in ${state} state) is not in the writable state and cannot be closed`));
+    }
+    const promise = newPromise((resolve, reject) => {
+        const closeRequest = {
+            _resolve: resolve,
+            _reject: reject
+        };
+        stream._closeRequest = closeRequest;
+    });
+    const writer = stream._writer;
+    if (writer !== undefined && stream._backpressure && state === 'writable') {
+        defaultWriterReadyPromiseResolve(writer);
+    }
+    WritableStreamDefaultControllerClose(stream._writableStreamController);
+    return promise;
+}
+// WritableStream API exposed for controllers.
+function WritableStreamAddWriteRequest(stream) {
+    const promise = newPromise((resolve, reject) => {
+        const writeRequest = {
+            _resolve: resolve,
+            _reject: reject
+        };
+        stream._writeRequests.push(writeRequest);
+    });
+    return promise;
+}
+function WritableStreamDealWithRejection(stream, error) {
+    const state = stream._state;
+    if (state === 'writable') {
+        WritableStreamStartErroring(stream, error);
+        return;
+    }
+    WritableStreamFinishErroring(stream);
+}
+function WritableStreamStartErroring(stream, reason) {
+    const controller = stream._writableStreamController;
+    stream._state = 'erroring';
+    stream._storedError = reason;
+    const writer = stream._writer;
+    if (writer !== undefined) {
+        WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);
+    }
+    if (!WritableStreamHasOperationMarkedInFlight(stream) && controller._started) {
+        WritableStreamFinishErroring(stream);
+    }
+}
+function WritableStreamFinishErroring(stream) {
+    stream._state = 'errored';
+    stream._writableStreamController[ErrorSteps]();
+    const storedError = stream._storedError;
+    stream._writeRequests.forEach(writeRequest => {
+        writeRequest._reject(storedError);
+    });
+    stream._writeRequests = new SimpleQueue();
+    if (stream._pendingAbortRequest === undefined) {
+        WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+        return;
+    }
+    const abortRequest = stream._pendingAbortRequest;
+    stream._pendingAbortRequest = undefined;
+    if (abortRequest._wasAlreadyErroring) {
+        abortRequest._reject(storedError);
+        WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+        return;
+    }
+    const promise = stream._writableStreamController[AbortSteps](abortRequest._reason);
+    uponPromise(promise, () => {
+        abortRequest._resolve();
+        WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+    }, (reason) => {
+        abortRequest._reject(reason);
+        WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+    });
+}
+function WritableStreamFinishInFlightWrite(stream) {
+    stream._inFlightWriteRequest._resolve(undefined);
+    stream._inFlightWriteRequest = undefined;
+}
+function WritableStreamFinishInFlightWriteWithError(stream, error) {
+    stream._inFlightWriteRequest._reject(error);
+    stream._inFlightWriteRequest = undefined;
+    WritableStreamDealWithRejection(stream, error);
+}
+function WritableStreamFinishInFlightClose(stream) {
+    stream._inFlightCloseRequest._resolve(undefined);
+    stream._inFlightCloseRequest = undefined;
+    const state = stream._state;
+    if (state === 'erroring') {
+        // The error was too late to do anything, so it is ignored.
+        stream._storedError = undefined;
+        if (stream._pendingAbortRequest !== undefined) {
+            stream._pendingAbortRequest._resolve();
+            stream._pendingAbortRequest = undefined;
+        }
+    }
+    stream._state = 'closed';
+    const writer = stream._writer;
+    if (writer !== undefined) {
+        defaultWriterClosedPromiseResolve(writer);
+    }
+}
+function WritableStreamFinishInFlightCloseWithError(stream, error) {
+    stream._inFlightCloseRequest._reject(error);
+    stream._inFlightCloseRequest = undefined;
+    // Never execute sink abort() after sink close().
+    if (stream._pendingAbortRequest !== undefined) {
+        stream._pendingAbortRequest._reject(error);
+        stream._pendingAbortRequest = undefined;
+    }
+    WritableStreamDealWithRejection(stream, error);
+}
+// TODO(ricea): Fix alphabetical order.
+function WritableStreamCloseQueuedOrInFlight(stream) {
+    if (stream._closeRequest === undefined && stream._inFlightCloseRequest === undefined) {
+        return false;
+    }
+    return true;
+}
+function WritableStreamHasOperationMarkedInFlight(stream) {
+    if (stream._inFlightWriteRequest === undefined && stream._inFlightCloseRequest === undefined) {
+        return false;
+    }
+    return true;
+}
+function WritableStreamMarkCloseRequestInFlight(stream) {
+    stream._inFlightCloseRequest = stream._closeRequest;
+    stream._closeRequest = undefined;
+}
+function WritableStreamMarkFirstWriteRequestInFlight(stream) {
+    stream._inFlightWriteRequest = stream._writeRequests.shift();
+}
+function WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream) {
+    if (stream._closeRequest !== undefined) {
+        stream._closeRequest._reject(stream._storedError);
+        stream._closeRequest = undefined;
+    }
+    const writer = stream._writer;
+    if (writer !== undefined) {
+        defaultWriterClosedPromiseReject(writer, stream._storedError);
+    }
+}
+function WritableStreamUpdateBackpressure(stream, backpressure) {
+    const writer = stream._writer;
+    if (writer !== undefined && backpressure !== stream._backpressure) {
+        if (backpressure) {
+            defaultWriterReadyPromiseReset(writer);
+        }
+        else {
+            defaultWriterReadyPromiseResolve(writer);
+        }
+    }
+    stream._backpressure = backpressure;
+}
+/**
+ * A default writer vended by a {@link WritableStream}.
+ *
+ * @public
+ */
+class WritableStreamDefaultWriter {
+    constructor(stream) {
+        assertRequiredArgument(stream, 1, 'WritableStreamDefaultWriter');
+        assertWritableStream(stream, 'First parameter');
+        if (IsWritableStreamLocked(stream)) {
+            throw new TypeError('This stream has already been locked for exclusive writing by another writer');
+        }
+        this._ownerWritableStream = stream;
+        stream._writer = this;
+        const state = stream._state;
+        if (state === 'writable') {
+            if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._backpressure) {
+                defaultWriterReadyPromiseInitialize(this);
+            }
+            else {
+                defaultWriterReadyPromiseInitializeAsResolved(this);
+            }
+            defaultWriterClosedPromiseInitialize(this);
+        }
+        else if (state === 'erroring') {
+            defaultWriterReadyPromiseInitializeAsRejected(this, stream._storedError);
+            defaultWriterClosedPromiseInitialize(this);
+        }
+        else if (state === 'closed') {
+            defaultWriterReadyPromiseInitializeAsResolved(this);
+            defaultWriterClosedPromiseInitializeAsResolved(this);
+        }
+        else {
+            const storedError = stream._storedError;
+            defaultWriterReadyPromiseInitializeAsRejected(this, storedError);
+            defaultWriterClosedPromiseInitializeAsRejected(this, storedError);
+        }
+    }
+    /**
+     * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or
+     * the writer’s lock is released before the stream finishes closing.
+     */
+    get closed() {
+        if (!IsWritableStreamDefaultWriter(this)) {
+            return promiseRejectedWith(defaultWriterBrandCheckException('closed'));
+        }
+        return this._closedPromise;
+    }
+    /**
+     * Returns the desired size to fill the stream’s internal queue. It can be negative, if the queue is over-full.
+     * A producer can use this information to determine the right amount of data to write.
+     *
+     * It will be `null` if the stream cannot be successfully written to (due to either being errored, or having an abort
+     * queued up). It will return zero if the stream is closed. And the getter will throw an exception if invoked when
+     * the writer’s lock is released.
+     */
+    get desiredSize() {
+        if (!IsWritableStreamDefaultWriter(this)) {
+            throw defaultWriterBrandCheckException('desiredSize');
+        }
+        if (this._ownerWritableStream === undefined) {
+            throw defaultWriterLockException('desiredSize');
+        }
+        return WritableStreamDefaultWriterGetDesiredSize(this);
+    }
+    /**
+     * Returns a promise that will be fulfilled when the desired size to fill the stream’s internal queue transitions
+     * from non-positive to positive, signaling that it is no longer applying backpressure. Once the desired size dips
+     * back to zero or below, the getter will return a new promise that stays pending until the next transition.
+     *
+     * If the stream becomes errored or aborted, or the writer’s lock is released, the returned promise will become
+     * rejected.
+     */
+    get ready() {
+        if (!IsWritableStreamDefaultWriter(this)) {
+            return promiseRejectedWith(defaultWriterBrandCheckException('ready'));
+        }
+        return this._readyPromise;
+    }
+    /**
+     * If the reader is active, behaves the same as {@link WritableStream.abort | stream.abort(reason)}.
+     */
+    abort(reason = undefined) {
+        if (!IsWritableStreamDefaultWriter(this)) {
+            return promiseRejectedWith(defaultWriterBrandCheckException('abort'));
+        }
+        if (this._ownerWritableStream === undefined) {
+            return promiseRejectedWith(defaultWriterLockException('abort'));
+        }
+        return WritableStreamDefaultWriterAbort(this, reason);
+    }
+    /**
+     * If the reader is active, behaves the same as {@link WritableStream.close | stream.close()}.
+     */
+    close() {
+        if (!IsWritableStreamDefaultWriter(this)) {
+            return promiseRejectedWith(defaultWriterBrandCheckException('close'));
+        }
+        const stream = this._ownerWritableStream;
+        if (stream === undefined) {
+            return promiseRejectedWith(defaultWriterLockException('close'));
+        }
+        if (WritableStreamCloseQueuedOrInFlight(stream)) {
+            return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));
+        }
+        return WritableStreamDefaultWriterClose(this);
+    }
+    /**
+     * Releases the writer’s lock on the corresponding stream. After the lock is released, the writer is no longer active.
+     * If the associated stream is errored when the lock is released, the writer will appear errored in the same way from
+     * now on; otherwise, the writer will appear closed.
+     *
+     * Note that the lock can still be released even if some ongoing writes have not yet finished (i.e. even if the
+     * promises returned from previous calls to {@link WritableStreamDefaultWriter.write | write()} have not yet settled).
+     * It’s not necessary to hold the lock on the writer for the duration of the write; the lock instead simply prevents
+     * other producers from writing in an interleaved manner.
+     */
+    releaseLock() {
+        if (!IsWritableStreamDefaultWriter(this)) {
+            throw defaultWriterBrandCheckException('releaseLock');
+        }
+        const stream = this._ownerWritableStream;
+        if (stream === undefined) {
+            return;
+        }
+        WritableStreamDefaultWriterRelease(this);
+    }
+    write(chunk = undefined) {
+        if (!IsWritableStreamDefaultWriter(this)) {
+            return promiseRejectedWith(defaultWriterBrandCheckException('write'));
+        }
+        if (this._ownerWritableStream === undefined) {
+            return promiseRejectedWith(defaultWriterLockException('write to'));
+        }
+        return WritableStreamDefaultWriterWrite(this, chunk);
+    }
+}
+Object.defineProperties(WritableStreamDefaultWriter.prototype, {
+    abort: { enumerable: true },
+    close: { enumerable: true },
+    releaseLock: { enumerable: true },
+    write: { enumerable: true },
+    closed: { enumerable: true },
+    desiredSize: { enumerable: true },
+    ready: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(WritableStreamDefaultWriter.prototype, SymbolPolyfill.toStringTag, {
+        value: 'WritableStreamDefaultWriter',
+        configurable: true
+    });
+}
+// Abstract operations for the WritableStreamDefaultWriter.
+function IsWritableStreamDefaultWriter(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) {
+        return false;
+    }
+    return x instanceof WritableStreamDefaultWriter;
+}
+// A client of WritableStreamDefaultWriter may use these functions directly to bypass state check.
+function WritableStreamDefaultWriterAbort(writer, reason) {
+    const stream = writer._ownerWritableStream;
+    return WritableStreamAbort(stream, reason);
+}
+function WritableStreamDefaultWriterClose(writer) {
+    const stream = writer._ownerWritableStream;
+    return WritableStreamClose(stream);
+}
+function WritableStreamDefaultWriterCloseWithErrorPropagation(writer) {
+    const stream = writer._ownerWritableStream;
+    const state = stream._state;
+    if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {
+        return promiseResolvedWith(undefined);
+    }
+    if (state === 'errored') {
+        return promiseRejectedWith(stream._storedError);
+    }
+    return WritableStreamDefaultWriterClose(writer);
+}
+function WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, error) {
+    if (writer._closedPromiseState === 'pending') {
+        defaultWriterClosedPromiseReject(writer, error);
+    }
+    else {
+        defaultWriterClosedPromiseResetToRejected(writer, error);
+    }
+}
+function WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, error) {
+    if (writer._readyPromiseState === 'pending') {
+        defaultWriterReadyPromiseReject(writer, error);
+    }
+    else {
+        defaultWriterReadyPromiseResetToRejected(writer, error);
+    }
+}
+function WritableStreamDefaultWriterGetDesiredSize(writer) {
+    const stream = writer._ownerWritableStream;
+    const state = stream._state;
+    if (state === 'errored' || state === 'erroring') {
+        return null;
+    }
+    if (state === 'closed') {
+        return 0;
+    }
+    return WritableStreamDefaultControllerGetDesiredSize(stream._writableStreamController);
+}
+function WritableStreamDefaultWriterRelease(writer) {
+    const stream = writer._ownerWritableStream;
+    const releasedError = new TypeError(`Writer was released and can no longer be used to monitor the stream's closedness`);
+    WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, releasedError);
+    // The state transitions to "errored" before the sink abort() method runs, but the writer.closed promise is not
+    // rejected until afterwards. This means that simply testing state will not work.
+    WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, releasedError);
+    stream._writer = undefined;
+    writer._ownerWritableStream = undefined;
+}
+function WritableStreamDefaultWriterWrite(writer, chunk) {
+    const stream = writer._ownerWritableStream;
+    const controller = stream._writableStreamController;
+    const chunkSize = WritableStreamDefaultControllerGetChunkSize(controller, chunk);
+    if (stream !== writer._ownerWritableStream) {
+        return promiseRejectedWith(defaultWriterLockException('write to'));
+    }
+    const state = stream._state;
+    if (state === 'errored') {
+        return promiseRejectedWith(stream._storedError);
+    }
+    if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {
+        return promiseRejectedWith(new TypeError('The stream is closing or closed and cannot be written to'));
+    }
+    if (state === 'erroring') {
+        return promiseRejectedWith(stream._storedError);
+    }
+    const promise = WritableStreamAddWriteRequest(stream);
+    WritableStreamDefaultControllerWrite(controller, chunk, chunkSize);
+    return promise;
+}
+const closeSentinel = {};
+/**
+ * Allows control of a {@link WritableStream | writable stream}'s state and internal queue.
+ *
+ * @public
+ */
+class WritableStreamDefaultController {
+    constructor() {
+        throw new TypeError('Illegal constructor');
+    }
+    /**
+     * The reason which was passed to `WritableStream.abort(reason)` when the stream was aborted.
+     *
+     * @deprecated
+     *  This property has been removed from the specification, see https://github.com/whatwg/streams/pull/1177.
+     *  Use {@link WritableStreamDefaultController.signal}'s `reason` instead.
+     */
+    get abortReason() {
+        if (!IsWritableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$2('abortReason');
+        }
+        return this._abortReason;
+    }
+    /**
+     * An `AbortSignal` that can be used to abort the pending write or close operation when the stream is aborted.
+     */
+    get signal() {
+        if (!IsWritableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$2('signal');
+        }
+        if (this._abortController === undefined) {
+            // Older browsers or older Node versions may not support `AbortController` or `AbortSignal`.
+            // We don't want to bundle and ship an `AbortController` polyfill together with our polyfill,
+            // so instead we only implement support for `signal` if we find a global `AbortController` constructor.
+            throw new TypeError('WritableStreamDefaultController.prototype.signal is not supported');
+        }
+        return this._abortController.signal;
+    }
+    /**
+     * Closes the controlled writable stream, making all future interactions with it fail with the given error `e`.
+     *
+     * This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying
+     * sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the
+     * normal lifecycle of interactions with the underlying sink.
+     */
+    error(e = undefined) {
+        if (!IsWritableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$2('error');
+        }
+        const state = this._controlledWritableStream._state;
+        if (state !== 'writable') {
+            // The stream is closed, errored or will be soon. The sink can't do anything useful if it gets an error here, so
+            // just treat it as a no-op.
+            return;
+        }
+        WritableStreamDefaultControllerError(this, e);
+    }
+    /** @internal */
+    [AbortSteps](reason) {
+        const result = this._abortAlgorithm(reason);
+        WritableStreamDefaultControllerClearAlgorithms(this);
+        return result;
+    }
+    /** @internal */
+    [ErrorSteps]() {
+        ResetQueue(this);
+    }
+}
+Object.defineProperties(WritableStreamDefaultController.prototype, {
+    abortReason: { enumerable: true },
+    signal: { enumerable: true },
+    error: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(WritableStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+        value: 'WritableStreamDefaultController',
+        configurable: true
+    });
+}
+// Abstract operations implementing interface required by the WritableStream.
+function IsWritableStreamDefaultController(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_controlledWritableStream')) {
+        return false;
+    }
+    return x instanceof WritableStreamDefaultController;
+}
+function SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm) {
+    controller._controlledWritableStream = stream;
+    stream._writableStreamController = controller;
+    // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.
+    controller._queue = undefined;
+    controller._queueTotalSize = undefined;
+    ResetQueue(controller);
+    controller._abortReason = undefined;
+    controller._abortController = createAbortController();
+    controller._started = false;
+    controller._strategySizeAlgorithm = sizeAlgorithm;
+    controller._strategyHWM = highWaterMark;
+    controller._writeAlgorithm = writeAlgorithm;
+    controller._closeAlgorithm = closeAlgorithm;
+    controller._abortAlgorithm = abortAlgorithm;
+    const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+    WritableStreamUpdateBackpressure(stream, backpressure);
+    const startResult = startAlgorithm();
+    const startPromise = promiseResolvedWith(startResult);
+    uponPromise(startPromise, () => {
+        controller._started = true;
+        WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+    }, r => {
+        controller._started = true;
+        WritableStreamDealWithRejection(stream, r);
+    });
+}
+function SetUpWritableStreamDefaultControllerFromUnderlyingSink(stream, underlyingSink, highWaterMark, sizeAlgorithm) {
+    const controller = Object.create(WritableStreamDefaultController.prototype);
+    let startAlgorithm = () => undefined;
+    let writeAlgorithm = () => promiseResolvedWith(undefined);
+    let closeAlgorithm = () => promiseResolvedWith(undefined);
+    let abortAlgorithm = () => promiseResolvedWith(undefined);
+    if (underlyingSink.start !== undefined) {
+        startAlgorithm = () => underlyingSink.start(controller);
+    }
+    if (underlyingSink.write !== undefined) {
+        writeAlgorithm = chunk => underlyingSink.write(chunk, controller);
+    }
+    if (underlyingSink.close !== undefined) {
+        closeAlgorithm = () => underlyingSink.close();
+    }
+    if (underlyingSink.abort !== undefined) {
+        abortAlgorithm = reason => underlyingSink.abort(reason);
+    }
+    SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm);
+}
+// ClearAlgorithms may be called twice. Erroring the same stream in multiple ways will often result in redundant calls.
+function WritableStreamDefaultControllerClearAlgorithms(controller) {
+    controller._writeAlgorithm = undefined;
+    controller._closeAlgorithm = undefined;
+    controller._abortAlgorithm = undefined;
+    controller._strategySizeAlgorithm = undefined;
+}
+function WritableStreamDefaultControllerClose(controller) {
+    EnqueueValueWithSize(controller, closeSentinel, 0);
+    WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+}
+function WritableStreamDefaultControllerGetChunkSize(controller, chunk) {
+    try {
+        return controller._strategySizeAlgorithm(chunk);
+    }
+    catch (chunkSizeE) {
+        WritableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE);
+        return 1;
+    }
+}
+function WritableStreamDefaultControllerGetDesiredSize(controller) {
+    return controller._strategyHWM - controller._queueTotalSize;
+}
+function WritableStreamDefaultControllerWrite(controller, chunk, chunkSize) {
+    try {
+        EnqueueValueWithSize(controller, chunk, chunkSize);
+    }
+    catch (enqueueE) {
+        WritableStreamDefaultControllerErrorIfNeeded(controller, enqueueE);
+        return;
+    }
+    const stream = controller._controlledWritableStream;
+    if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._state === 'writable') {
+        const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+        WritableStreamUpdateBackpressure(stream, backpressure);
+    }
+    WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+}
+// Abstract operations for the WritableStreamDefaultController.
+function WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller) {
+    const stream = controller._controlledWritableStream;
+    if (!controller._started) {
+        return;
+    }
+    if (stream._inFlightWriteRequest !== undefined) {
+        return;
+    }
+    const state = stream._state;
+    if (state === 'erroring') {
+        WritableStreamFinishErroring(stream);
+        return;
+    }
+    if (controller._queue.length === 0) {
+        return;
+    }
+    const value = PeekQueueValue(controller);
+    if (value === closeSentinel) {
+        WritableStreamDefaultControllerProcessClose(controller);
+    }
+    else {
+        WritableStreamDefaultControllerProcessWrite(controller, value);
+    }
+}
+function WritableStreamDefaultControllerErrorIfNeeded(controller, error) {
+    if (controller._controlledWritableStream._state === 'writable') {
+        WritableStreamDefaultControllerError(controller, error);
+    }
+}
+function WritableStreamDefaultControllerProcessClose(controller) {
+    const stream = controller._controlledWritableStream;
+    WritableStreamMarkCloseRequestInFlight(stream);
+    DequeueValue(controller);
+    const sinkClosePromise = controller._closeAlgorithm();
+    WritableStreamDefaultControllerClearAlgorithms(controller);
+    uponPromise(sinkClosePromise, () => {
+        WritableStreamFinishInFlightClose(stream);
+    }, reason => {
+        WritableStreamFinishInFlightCloseWithError(stream, reason);
+    });
+}
+function WritableStreamDefaultControllerProcessWrite(controller, chunk) {
+    const stream = controller._controlledWritableStream;
+    WritableStreamMarkFirstWriteRequestInFlight(stream);
+    const sinkWritePromise = controller._writeAlgorithm(chunk);
+    uponPromise(sinkWritePromise, () => {
+        WritableStreamFinishInFlightWrite(stream);
+        const state = stream._state;
+        DequeueValue(controller);
+        if (!WritableStreamCloseQueuedOrInFlight(stream) && state === 'writable') {
+            const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+            WritableStreamUpdateBackpressure(stream, backpressure);
+        }
+        WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+    }, reason => {
+        if (stream._state === 'writable') {
+            WritableStreamDefaultControllerClearAlgorithms(controller);
+        }
+        WritableStreamFinishInFlightWriteWithError(stream, reason);
+    });
+}
+function WritableStreamDefaultControllerGetBackpressure(controller) {
+    const desiredSize = WritableStreamDefaultControllerGetDesiredSize(controller);
+    return desiredSize <= 0;
+}
+// A client of WritableStreamDefaultController may use these functions directly to bypass state check.
+function WritableStreamDefaultControllerError(controller, error) {
+    const stream = controller._controlledWritableStream;
+    WritableStreamDefaultControllerClearAlgorithms(controller);
+    WritableStreamStartErroring(stream, error);
+}
+// Helper functions for the WritableStream.
+function streamBrandCheckException$2(name) {
+    return new TypeError(`WritableStream.prototype.${name} can only be used on a WritableStream`);
+}
+// Helper functions for the WritableStreamDefaultController.
+function defaultControllerBrandCheckException$2(name) {
+    return new TypeError(`WritableStreamDefaultController.prototype.${name} can only be used on a WritableStreamDefaultController`);
+}
+// Helper functions for the WritableStreamDefaultWriter.
+function defaultWriterBrandCheckException(name) {
+    return new TypeError(`WritableStreamDefaultWriter.prototype.${name} can only be used on a WritableStreamDefaultWriter`);
+}
+function defaultWriterLockException(name) {
+    return new TypeError('Cannot ' + name + ' a stream using a released writer');
+}
+function defaultWriterClosedPromiseInitialize(writer) {
+    writer._closedPromise = newPromise((resolve, reject) => {
+        writer._closedPromise_resolve = resolve;
+        writer._closedPromise_reject = reject;
+        writer._closedPromiseState = 'pending';
+    });
+}
+function defaultWriterClosedPromiseInitializeAsRejected(writer, reason) {
+    defaultWriterClosedPromiseInitialize(writer);
+    defaultWriterClosedPromiseReject(writer, reason);
+}
+function defaultWriterClosedPromiseInitializeAsResolved(writer) {
+    defaultWriterClosedPromiseInitialize(writer);
+    defaultWriterClosedPromiseResolve(writer);
+}
+function defaultWriterClosedPromiseReject(writer, reason) {
+    if (writer._closedPromise_reject === undefined) {
+        return;
+    }
+    setPromiseIsHandledToTrue(writer._closedPromise);
+    writer._closedPromise_reject(reason);
+    writer._closedPromise_resolve = undefined;
+    writer._closedPromise_reject = undefined;
+    writer._closedPromiseState = 'rejected';
+}
+function defaultWriterClosedPromiseResetToRejected(writer, reason) {
+    defaultWriterClosedPromiseInitializeAsRejected(writer, reason);
+}
+function defaultWriterClosedPromiseResolve(writer) {
+    if (writer._closedPromise_resolve === undefined) {
+        return;
+    }
+    writer._closedPromise_resolve(undefined);
+    writer._closedPromise_resolve = undefined;
+    writer._closedPromise_reject = undefined;
+    writer._closedPromiseState = 'resolved';
+}
+function defaultWriterReadyPromiseInitialize(writer) {
+    writer._readyPromise = newPromise((resolve, reject) => {
+        writer._readyPromise_resolve = resolve;
+        writer._readyPromise_reject = reject;
+    });
+    writer._readyPromiseState = 'pending';
+}
+function defaultWriterReadyPromiseInitializeAsRejected(writer, reason) {
+    defaultWriterReadyPromiseInitialize(writer);
+    defaultWriterReadyPromiseReject(writer, reason);
+}
+function defaultWriterReadyPromiseInitializeAsResolved(writer) {
+    defaultWriterReadyPromiseInitialize(writer);
+    defaultWriterReadyPromiseResolve(writer);
+}
+function defaultWriterReadyPromiseReject(writer, reason) {
+    if (writer._readyPromise_reject === undefined) {
+        return;
+    }
+    setPromiseIsHandledToTrue(writer._readyPromise);
+    writer._readyPromise_reject(reason);
+    writer._readyPromise_resolve = undefined;
+    writer._readyPromise_reject = undefined;
+    writer._readyPromiseState = 'rejected';
+}
+function defaultWriterReadyPromiseReset(writer) {
+    defaultWriterReadyPromiseInitialize(writer);
+}
+function defaultWriterReadyPromiseResetToRejected(writer, reason) {
+    defaultWriterReadyPromiseInitializeAsRejected(writer, reason);
+}
+function defaultWriterReadyPromiseResolve(writer) {
+    if (writer._readyPromise_resolve === undefined) {
+        return;
+    }
+    writer._readyPromise_resolve(undefined);
+    writer._readyPromise_resolve = undefined;
+    writer._readyPromise_reject = undefined;
+    writer._readyPromiseState = 'fulfilled';
+}
+
+/// <reference lib="dom" />
+const NativeDOMException = typeof DOMException !== 'undefined' ? DOMException : undefined;
+
+/// <reference types="node" />
+function isDOMExceptionConstructor(ctor) {
+    if (!(typeof ctor === 'function' || typeof ctor === 'object')) {
+        return false;
+    }
+    try {
+        new ctor();
+        return true;
+    }
+    catch (_a) {
+        return false;
+    }
+}
+function createDOMExceptionPolyfill() {
+    // eslint-disable-next-line no-shadow
+    const ctor = function DOMException(message, name) {
+        this.message = message || '';
+        this.name = name || 'Error';
+        if (Error.captureStackTrace) {
+            Error.captureStackTrace(this, this.constructor);
+        }
+    };
+    ctor.prototype = Object.create(Error.prototype);
+    Object.defineProperty(ctor.prototype, 'constructor', { value: ctor, writable: true, configurable: true });
+    return ctor;
+}
+// eslint-disable-next-line no-redeclare
+const DOMException$1 = isDOMExceptionConstructor(NativeDOMException) ? NativeDOMException : createDOMExceptionPolyfill();
+
+function ReadableStreamPipeTo(source, dest, preventClose, preventAbort, preventCancel, signal) {
+    const reader = AcquireReadableStreamDefaultReader(source);
+    const writer = AcquireWritableStreamDefaultWriter(dest);
+    source._disturbed = true;
+    let shuttingDown = false;
+    // This is used to keep track of the spec's requirement that we wait for ongoing writes during shutdown.
+    let currentWrite = promiseResolvedWith(undefined);
+    return newPromise((resolve, reject) => {
+        let abortAlgorithm;
+        if (signal !== undefined) {
+            abortAlgorithm = () => {
+                const error = new DOMException$1('Aborted', 'AbortError');
+                const actions = [];
+                if (!preventAbort) {
+                    actions.push(() => {
+                        if (dest._state === 'writable') {
+                            return WritableStreamAbort(dest, error);
+                        }
+                        return promiseResolvedWith(undefined);
+                    });
+                }
+                if (!preventCancel) {
+                    actions.push(() => {
+                        if (source._state === 'readable') {
+                            return ReadableStreamCancel(source, error);
+                        }
+                        return promiseResolvedWith(undefined);
+                    });
+                }
+                shutdownWithAction(() => Promise.all(actions.map(action => action())), true, error);
+            };
+            if (signal.aborted) {
+                abortAlgorithm();
+                return;
+            }
+            signal.addEventListener('abort', abortAlgorithm);
+        }
+        // Using reader and writer, read all chunks from this and write them to dest
+        // - Backpressure must be enforced
+        // - Shutdown must stop all activity
+        function pipeLoop() {
+            return newPromise((resolveLoop, rejectLoop) => {
+                function next(done) {
+                    if (done) {
+                        resolveLoop();
+                    }
+                    else {
+                        // Use `PerformPromiseThen` instead of `uponPromise` to avoid
+                        // adding unnecessary `.catch(rethrowAssertionErrorRejection)` handlers
+                        PerformPromiseThen(pipeStep(), next, rejectLoop);
+                    }
+                }
+                next(false);
+            });
+        }
+        function pipeStep() {
+            if (shuttingDown) {
+                return promiseResolvedWith(true);
+            }
+            return PerformPromiseThen(writer._readyPromise, () => {
+                return newPromise((resolveRead, rejectRead) => {
+                    ReadableStreamDefaultReaderRead(reader, {
+                        _chunkSteps: chunk => {
+                            currentWrite = PerformPromiseThen(WritableStreamDefaultWriterWrite(writer, chunk), undefined, noop);
+                            resolveRead(false);
+                        },
+                        _closeSteps: () => resolveRead(true),
+                        _errorSteps: rejectRead
+                    });
+                });
+            });
+        }
+        // Errors must be propagated forward
+        isOrBecomesErrored(source, reader._closedPromise, storedError => {
+            if (!preventAbort) {
+                shutdownWithAction(() => WritableStreamAbort(dest, storedError), true, storedError);
+            }
+            else {
+                shutdown(true, storedError);
+            }
+        });
+        // Errors must be propagated backward
+        isOrBecomesErrored(dest, writer._closedPromise, storedError => {
+            if (!preventCancel) {
+                shutdownWithAction(() => ReadableStreamCancel(source, storedError), true, storedError);
+            }
+            else {
+                shutdown(true, storedError);
+            }
+        });
+        // Closing must be propagated forward
+        isOrBecomesClosed(source, reader._closedPromise, () => {
+            if (!preventClose) {
+                shutdownWithAction(() => WritableStreamDefaultWriterCloseWithErrorPropagation(writer));
+            }
+            else {
+                shutdown();
+            }
+        });
+        // Closing must be propagated backward
+        if (WritableStreamCloseQueuedOrInFlight(dest) || dest._state === 'closed') {
+            const destClosed = new TypeError('the destination writable stream closed before all data could be piped to it');
+            if (!preventCancel) {
+                shutdownWithAction(() => ReadableStreamCancel(source, destClosed), true, destClosed);
+            }
+            else {
+                shutdown(true, destClosed);
+            }
+        }
+        setPromiseIsHandledToTrue(pipeLoop());
+        function waitForWritesToFinish() {
+            // Another write may have started while we were waiting on this currentWrite, so we have to be sure to wait
+            // for that too.
+            const oldCurrentWrite = currentWrite;
+            return PerformPromiseThen(currentWrite, () => oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined);
+        }
+        function isOrBecomesErrored(stream, promise, action) {
+            if (stream._state === 'errored') {
+                action(stream._storedError);
+            }
+            else {
+                uponRejection(promise, action);
+            }
+        }
+        function isOrBecomesClosed(stream, promise, action) {
+            if (stream._state === 'closed') {
+                action();
+            }
+            else {
+                uponFulfillment(promise, action);
+            }
+        }
+        function shutdownWithAction(action, originalIsError, originalError) {
+            if (shuttingDown) {
+                return;
+            }
+            shuttingDown = true;
+            if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {
+                uponFulfillment(waitForWritesToFinish(), doTheRest);
+            }
+            else {
+                doTheRest();
+            }
+            function doTheRest() {
+                uponPromise(action(), () => finalize(originalIsError, originalError), newError => finalize(true, newError));
+            }
+        }
+        function shutdown(isError, error) {
+            if (shuttingDown) {
+                return;
+            }
+            shuttingDown = true;
+            if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {
+                uponFulfillment(waitForWritesToFinish(), () => finalize(isError, error));
+            }
+            else {
+                finalize(isError, error);
+            }
+        }
+        function finalize(isError, error) {
+            WritableStreamDefaultWriterRelease(writer);
+            ReadableStreamReaderGenericRelease(reader);
+            if (signal !== undefined) {
+                signal.removeEventListener('abort', abortAlgorithm);
+            }
+            if (isError) {
+                reject(error);
+            }
+            else {
+                resolve(undefined);
+            }
+        }
+    });
+}
+
+/**
+ * Allows control of a {@link ReadableStream | readable stream}'s state and internal queue.
+ *
+ * @public
+ */
+class ReadableStreamDefaultController {
+    constructor() {
+        throw new TypeError('Illegal constructor');
+    }
+    /**
+     * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is
+     * over-full. An underlying source ought to use this information to determine when and how to apply backpressure.
+     */
+    get desiredSize() {
+        if (!IsReadableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$1('desiredSize');
+        }
+        return ReadableStreamDefaultControllerGetDesiredSize(this);
+    }
+    /**
+     * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from
+     * the stream, but once those are read, the stream will become closed.
+     */
+    close() {
+        if (!IsReadableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$1('close');
+        }
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {
+            throw new TypeError('The stream is not in a state that permits close');
+        }
+        ReadableStreamDefaultControllerClose(this);
+    }
+    enqueue(chunk = undefined) {
+        if (!IsReadableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$1('enqueue');
+        }
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {
+            throw new TypeError('The stream is not in a state that permits enqueue');
+        }
+        return ReadableStreamDefaultControllerEnqueue(this, chunk);
+    }
+    /**
+     * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.
+     */
+    error(e = undefined) {
+        if (!IsReadableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$1('error');
+        }
+        ReadableStreamDefaultControllerError(this, e);
+    }
+    /** @internal */
+    [CancelSteps](reason) {
+        ResetQueue(this);
+        const result = this._cancelAlgorithm(reason);
+        ReadableStreamDefaultControllerClearAlgorithms(this);
+        return result;
+    }
+    /** @internal */
+    [PullSteps](readRequest) {
+        const stream = this._controlledReadableStream;
+        if (this._queue.length > 0) {
+            const chunk = DequeueValue(this);
+            if (this._closeRequested && this._queue.length === 0) {
+                ReadableStreamDefaultControllerClearAlgorithms(this);
+                ReadableStreamClose(stream);
+            }
+            else {
+                ReadableStreamDefaultControllerCallPullIfNeeded(this);
+            }
+            readRequest._chunkSteps(chunk);
+        }
+        else {
+            ReadableStreamAddReadRequest(stream, readRequest);
+            ReadableStreamDefaultControllerCallPullIfNeeded(this);
+        }
+    }
+}
+Object.defineProperties(ReadableStreamDefaultController.prototype, {
+    close: { enumerable: true },
+    enqueue: { enumerable: true },
+    error: { enumerable: true },
+    desiredSize: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableStreamDefaultController',
+        configurable: true
+    });
+}
+// Abstract operations for the ReadableStreamDefaultController.
+function IsReadableStreamDefaultController(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableStream')) {
+        return false;
+    }
+    return x instanceof ReadableStreamDefaultController;
+}
+function ReadableStreamDefaultControllerCallPullIfNeeded(controller) {
+    const shouldPull = ReadableStreamDefaultControllerShouldCallPull(controller);
+    if (!shouldPull) {
+        return;
+    }
+    if (controller._pulling) {
+        controller._pullAgain = true;
+        return;
+    }
+    controller._pulling = true;
+    const pullPromise = controller._pullAlgorithm();
+    uponPromise(pullPromise, () => {
+        controller._pulling = false;
+        if (controller._pullAgain) {
+            controller._pullAgain = false;
+            ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+        }
+    }, e => {
+        ReadableStreamDefaultControllerError(controller, e);
+    });
+}
+function ReadableStreamDefaultControllerShouldCallPull(controller) {
+    const stream = controller._controlledReadableStream;
+    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+        return false;
+    }
+    if (!controller._started) {
+        return false;
+    }
+    if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+        return true;
+    }
+    const desiredSize = ReadableStreamDefaultControllerGetDesiredSize(controller);
+    if (desiredSize > 0) {
+        return true;
+    }
+    return false;
+}
+function ReadableStreamDefaultControllerClearAlgorithms(controller) {
+    controller._pullAlgorithm = undefined;
+    controller._cancelAlgorithm = undefined;
+    controller._strategySizeAlgorithm = undefined;
+}
+// A client of ReadableStreamDefaultController may use these functions directly to bypass state check.
+function ReadableStreamDefaultControllerClose(controller) {
+    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+        return;
+    }
+    const stream = controller._controlledReadableStream;
+    controller._closeRequested = true;
+    if (controller._queue.length === 0) {
+        ReadableStreamDefaultControllerClearAlgorithms(controller);
+        ReadableStreamClose(stream);
+    }
+}
+function ReadableStreamDefaultControllerEnqueue(controller, chunk) {
+    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+        return;
+    }
+    const stream = controller._controlledReadableStream;
+    if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+        ReadableStreamFulfillReadRequest(stream, chunk, false);
+    }
+    else {
+        let chunkSize;
+        try {
+            chunkSize = controller._strategySizeAlgorithm(chunk);
+        }
+        catch (chunkSizeE) {
+            ReadableStreamDefaultControllerError(controller, chunkSizeE);
+            throw chunkSizeE;
+        }
+        try {
+            EnqueueValueWithSize(controller, chunk, chunkSize);
+        }
+        catch (enqueueE) {
+            ReadableStreamDefaultControllerError(controller, enqueueE);
+            throw enqueueE;
+        }
+    }
+    ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+}
+function ReadableStreamDefaultControllerError(controller, e) {
+    const stream = controller._controlledReadableStream;
+    if (stream._state !== 'readable') {
+        return;
+    }
+    ResetQueue(controller);
+    ReadableStreamDefaultControllerClearAlgorithms(controller);
+    ReadableStreamError(stream, e);
+}
+function ReadableStreamDefaultControllerGetDesiredSize(controller) {
+    const state = controller._controlledReadableStream._state;
+    if (state === 'errored') {
+        return null;
+    }
+    if (state === 'closed') {
+        return 0;
+    }
+    return controller._strategyHWM - controller._queueTotalSize;
+}
+// This is used in the implementation of TransformStream.
+function ReadableStreamDefaultControllerHasBackpressure(controller) {
+    if (ReadableStreamDefaultControllerShouldCallPull(controller)) {
+        return false;
+    }
+    return true;
+}
+function ReadableStreamDefaultControllerCanCloseOrEnqueue(controller) {
+    const state = controller._controlledReadableStream._state;
+    if (!controller._closeRequested && state === 'readable') {
+        return true;
+    }
+    return false;
+}
+function SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm) {
+    controller._controlledReadableStream = stream;
+    controller._queue = undefined;
+    controller._queueTotalSize = undefined;
+    ResetQueue(controller);
+    controller._started = false;
+    controller._closeRequested = false;
+    controller._pullAgain = false;
+    controller._pulling = false;
+    controller._strategySizeAlgorithm = sizeAlgorithm;
+    controller._strategyHWM = highWaterMark;
+    controller._pullAlgorithm = pullAlgorithm;
+    controller._cancelAlgorithm = cancelAlgorithm;
+    stream._readableStreamController = controller;
+    const startResult = startAlgorithm();
+    uponPromise(promiseResolvedWith(startResult), () => {
+        controller._started = true;
+        ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+    }, r => {
+        ReadableStreamDefaultControllerError(controller, r);
+    });
+}
+function SetUpReadableStreamDefaultControllerFromUnderlyingSource(stream, underlyingSource, highWaterMark, sizeAlgorithm) {
+    const controller = Object.create(ReadableStreamDefaultController.prototype);
+    let startAlgorithm = () => undefined;
+    let pullAlgorithm = () => promiseResolvedWith(undefined);
+    let cancelAlgorithm = () => promiseResolvedWith(undefined);
+    if (underlyingSource.start !== undefined) {
+        startAlgorithm = () => underlyingSource.start(controller);
+    }
+    if (underlyingSource.pull !== undefined) {
+        pullAlgorithm = () => underlyingSource.pull(controller);
+    }
+    if (underlyingSource.cancel !== undefined) {
+        cancelAlgorithm = reason => underlyingSource.cancel(reason);
+    }
+    SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm);
+}
+// Helper functions for the ReadableStreamDefaultController.
+function defaultControllerBrandCheckException$1(name) {
+    return new TypeError(`ReadableStreamDefaultController.prototype.${name} can only be used on a ReadableStreamDefaultController`);
+}
+
+function ReadableStreamTee(stream, cloneForBranch2) {
+    if (IsReadableByteStreamController(stream._readableStreamController)) {
+        return ReadableByteStreamTee(stream);
+    }
+    return ReadableStreamDefaultTee(stream);
+}
+function ReadableStreamDefaultTee(stream, cloneForBranch2) {
+    const reader = AcquireReadableStreamDefaultReader(stream);
+    let reading = false;
+    let readAgain = false;
+    let canceled1 = false;
+    let canceled2 = false;
+    let reason1;
+    let reason2;
+    let branch1;
+    let branch2;
+    let resolveCancelPromise;
+    const cancelPromise = newPromise(resolve => {
+        resolveCancelPromise = resolve;
+    });
+    function pullAlgorithm() {
+        if (reading) {
+            readAgain = true;
+            return promiseResolvedWith(undefined);
+        }
+        reading = true;
+        const readRequest = {
+            _chunkSteps: chunk => {
+                // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                // successful synchronously-available reads get ahead of asynchronously-available errors.
+                queueMicrotask(() => {
+                    readAgain = false;
+                    const chunk1 = chunk;
+                    const chunk2 = chunk;
+                    // There is no way to access the cloning code right now in the reference implementation.
+                    // If we add one then we'll need an implementation for serializable objects.
+                    // if (!canceled2 && cloneForBranch2) {
+                    //   chunk2 = StructuredDeserialize(StructuredSerialize(chunk2));
+                    // }
+                    if (!canceled1) {
+                        ReadableStreamDefaultControllerEnqueue(branch1._readableStreamController, chunk1);
+                    }
+                    if (!canceled2) {
+                        ReadableStreamDefaultControllerEnqueue(branch2._readableStreamController, chunk2);
+                    }
+                    reading = false;
+                    if (readAgain) {
+                        pullAlgorithm();
+                    }
+                });
+            },
+            _closeSteps: () => {
+                reading = false;
+                if (!canceled1) {
+                    ReadableStreamDefaultControllerClose(branch1._readableStreamController);
+                }
+                if (!canceled2) {
+                    ReadableStreamDefaultControllerClose(branch2._readableStreamController);
+                }
+                if (!canceled1 || !canceled2) {
+                    resolveCancelPromise(undefined);
+                }
+            },
+            _errorSteps: () => {
+                reading = false;
+            }
+        };
+        ReadableStreamDefaultReaderRead(reader, readRequest);
+        return promiseResolvedWith(undefined);
+    }
+    function cancel1Algorithm(reason) {
+        canceled1 = true;
+        reason1 = reason;
+        if (canceled2) {
+            const compositeReason = CreateArrayFromList([reason1, reason2]);
+            const cancelResult = ReadableStreamCancel(stream, compositeReason);
+            resolveCancelPromise(cancelResult);
+        }
+        return cancelPromise;
+    }
+    function cancel2Algorithm(reason) {
+        canceled2 = true;
+        reason2 = reason;
+        if (canceled1) {
+            const compositeReason = CreateArrayFromList([reason1, reason2]);
+            const cancelResult = ReadableStreamCancel(stream, compositeReason);
+            resolveCancelPromise(cancelResult);
+        }
+        return cancelPromise;
+    }
+    function startAlgorithm() {
+        // do nothing
+    }
+    branch1 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel1Algorithm);
+    branch2 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel2Algorithm);
+    uponRejection(reader._closedPromise, (r) => {
+        ReadableStreamDefaultControllerError(branch1._readableStreamController, r);
+        ReadableStreamDefaultControllerError(branch2._readableStreamController, r);
+        if (!canceled1 || !canceled2) {
+            resolveCancelPromise(undefined);
+        }
+    });
+    return [branch1, branch2];
+}
+function ReadableByteStreamTee(stream) {
+    let reader = AcquireReadableStreamDefaultReader(stream);
+    let reading = false;
+    let readAgainForBranch1 = false;
+    let readAgainForBranch2 = false;
+    let canceled1 = false;
+    let canceled2 = false;
+    let reason1;
+    let reason2;
+    let branch1;
+    let branch2;
+    let resolveCancelPromise;
+    const cancelPromise = newPromise(resolve => {
+        resolveCancelPromise = resolve;
+    });
+    function forwardReaderError(thisReader) {
+        uponRejection(thisReader._closedPromise, r => {
+            if (thisReader !== reader) {
+                return;
+            }
+            ReadableByteStreamControllerError(branch1._readableStreamController, r);
+            ReadableByteStreamControllerError(branch2._readableStreamController, r);
+            if (!canceled1 || !canceled2) {
+                resolveCancelPromise(undefined);
+            }
+        });
+    }
+    function pullWithDefaultReader() {
+        if (IsReadableStreamBYOBReader(reader)) {
+            ReadableStreamReaderGenericRelease(reader);
+            reader = AcquireReadableStreamDefaultReader(stream);
+            forwardReaderError(reader);
+        }
+        const readRequest = {
+            _chunkSteps: chunk => {
+                // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                // successful synchronously-available reads get ahead of asynchronously-available errors.
+                queueMicrotask(() => {
+                    readAgainForBranch1 = false;
+                    readAgainForBranch2 = false;
+                    const chunk1 = chunk;
+                    let chunk2 = chunk;
+                    if (!canceled1 && !canceled2) {
+                        try {
+                            chunk2 = CloneAsUint8Array(chunk);
+                        }
+                        catch (cloneE) {
+                            ReadableByteStreamControllerError(branch1._readableStreamController, cloneE);
+                            ReadableByteStreamControllerError(branch2._readableStreamController, cloneE);
+                            resolveCancelPromise(ReadableStreamCancel(stream, cloneE));
+                            return;
+                        }
+                    }
+                    if (!canceled1) {
+                        ReadableByteStreamControllerEnqueue(branch1._readableStreamController, chunk1);
+                    }
+                    if (!canceled2) {
+                        ReadableByteStreamControllerEnqueue(branch2._readableStreamController, chunk2);
+                    }
+                    reading = false;
+                    if (readAgainForBranch1) {
+                        pull1Algorithm();
+                    }
+                    else if (readAgainForBranch2) {
+                        pull2Algorithm();
+                    }
+                });
+            },
+            _closeSteps: () => {
+                reading = false;
+                if (!canceled1) {
+                    ReadableByteStreamControllerClose(branch1._readableStreamController);
+                }
+                if (!canceled2) {
+                    ReadableByteStreamControllerClose(branch2._readableStreamController);
+                }
+                if (branch1._readableStreamController._pendingPullIntos.length > 0) {
+                    ReadableByteStreamControllerRespond(branch1._readableStreamController, 0);
+                }
+                if (branch2._readableStreamController._pendingPullIntos.length > 0) {
+                    ReadableByteStreamControllerRespond(branch2._readableStreamController, 0);
+                }
+                if (!canceled1 || !canceled2) {
+                    resolveCancelPromise(undefined);
+                }
+            },
+            _errorSteps: () => {
+                reading = false;
+            }
+        };
+        ReadableStreamDefaultReaderRead(reader, readRequest);
+    }
+    function pullWithBYOBReader(view, forBranch2) {
+        if (IsReadableStreamDefaultReader(reader)) {
+            ReadableStreamReaderGenericRelease(reader);
+            reader = AcquireReadableStreamBYOBReader(stream);
+            forwardReaderError(reader);
+        }
+        const byobBranch = forBranch2 ? branch2 : branch1;
+        const otherBranch = forBranch2 ? branch1 : branch2;
+        const readIntoRequest = {
+            _chunkSteps: chunk => {
+                // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                // successful synchronously-available reads get ahead of asynchronously-available errors.
+                queueMicrotask(() => {
+                    readAgainForBranch1 = false;
+                    readAgainForBranch2 = false;
+                    const byobCanceled = forBranch2 ? canceled2 : canceled1;
+                    const otherCanceled = forBranch2 ? canceled1 : canceled2;
+                    if (!otherCanceled) {
+                        let clonedChunk;
+                        try {
+                            clonedChunk = CloneAsUint8Array(chunk);
+                        }
+                        catch (cloneE) {
+                            ReadableByteStreamControllerError(byobBranch._readableStreamController, cloneE);
+                            ReadableByteStreamControllerError(otherBranch._readableStreamController, cloneE);
+                            resolveCancelPromise(ReadableStreamCancel(stream, cloneE));
+                            return;
+                        }
+                        if (!byobCanceled) {
+                            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                        }
+                        ReadableByteStreamControllerEnqueue(otherBranch._readableStreamController, clonedChunk);
+                    }
+                    else if (!byobCanceled) {
+                        ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                    }
+                    reading = false;
+                    if (readAgainForBranch1) {
+                        pull1Algorithm();
+                    }
+                    else if (readAgainForBranch2) {
+                        pull2Algorithm();
+                    }
+                });
+            },
+            _closeSteps: chunk => {
+                reading = false;
+                const byobCanceled = forBranch2 ? canceled2 : canceled1;
+                const otherCanceled = forBranch2 ? canceled1 : canceled2;
+                if (!byobCanceled) {
+                    ReadableByteStreamControllerClose(byobBranch._readableStreamController);
+                }
+                if (!otherCanceled) {
+                    ReadableByteStreamControllerClose(otherBranch._readableStreamController);
+                }
+                if (chunk !== undefined) {
+                    if (!byobCanceled) {
+                        ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                    }
+                    if (!otherCanceled && otherBranch._readableStreamController._pendingPullIntos.length > 0) {
+                        ReadableByteStreamControllerRespond(otherBranch._readableStreamController, 0);
+                    }
+                }
+                if (!byobCanceled || !otherCanceled) {
+                    resolveCancelPromise(undefined);
+                }
+            },
+            _errorSteps: () => {
+                reading = false;
+            }
+        };
+        ReadableStreamBYOBReaderRead(reader, view, readIntoRequest);
+    }
+    function pull1Algorithm() {
+        if (reading) {
+            readAgainForBranch1 = true;
+            return promiseResolvedWith(undefined);
+        }
+        reading = true;
+        const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch1._readableStreamController);
+        if (byobRequest === null) {
+            pullWithDefaultReader();
+        }
+        else {
+            pullWithBYOBReader(byobRequest._view, false);
+        }
+        return promiseResolvedWith(undefined);
+    }
+    function pull2Algorithm() {
+        if (reading) {
+            readAgainForBranch2 = true;
+            return promiseResolvedWith(undefined);
+        }
+        reading = true;
+        const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch2._readableStreamController);
+        if (byobRequest === null) {
+            pullWithDefaultReader();
+        }
+        else {
+            pullWithBYOBReader(byobRequest._view, true);
+        }
+        return promiseResolvedWith(undefined);
+    }
+    function cancel1Algorithm(reason) {
+        canceled1 = true;
+        reason1 = reason;
+        if (canceled2) {
+            const compositeReason = CreateArrayFromList([reason1, reason2]);
+            const cancelResult = ReadableStreamCancel(stream, compositeReason);
+            resolveCancelPromise(cancelResult);
+        }
+        return cancelPromise;
+    }
+    function cancel2Algorithm(reason) {
+        canceled2 = true;
+        reason2 = reason;
+        if (canceled1) {
+            const compositeReason = CreateArrayFromList([reason1, reason2]);
+            const cancelResult = ReadableStreamCancel(stream, compositeReason);
+            resolveCancelPromise(cancelResult);
+        }
+        return cancelPromise;
+    }
+    function startAlgorithm() {
+        return;
+    }
+    branch1 = CreateReadableByteStream(startAlgorithm, pull1Algorithm, cancel1Algorithm);
+    branch2 = CreateReadableByteStream(startAlgorithm, pull2Algorithm, cancel2Algorithm);
+    forwardReaderError(reader);
+    return [branch1, branch2];
+}
+
+function convertUnderlyingDefaultOrByteSource(source, context) {
+    assertDictionary(source, context);
+    const original = source;
+    const autoAllocateChunkSize = original === null || original === void 0 ? void 0 : original.autoAllocateChunkSize;
+    const cancel = original === null || original === void 0 ? void 0 : original.cancel;
+    const pull = original === null || original === void 0 ? void 0 : original.pull;
+    const start = original === null || original === void 0 ? void 0 : original.start;
+    const type = original === null || original === void 0 ? void 0 : original.type;
+    return {
+        autoAllocateChunkSize: autoAllocateChunkSize === undefined ?
+            undefined :
+            convertUnsignedLongLongWithEnforceRange(autoAllocateChunkSize, `${context} has member 'autoAllocateChunkSize' that`),
+        cancel: cancel === undefined ?
+            undefined :
+            convertUnderlyingSourceCancelCallback(cancel, original, `${context} has member 'cancel' that`),
+        pull: pull === undefined ?
+            undefined :
+            convertUnderlyingSourcePullCallback(pull, original, `${context} has member 'pull' that`),
+        start: start === undefined ?
+            undefined :
+            convertUnderlyingSourceStartCallback(start, original, `${context} has member 'start' that`),
+        type: type === undefined ? undefined : convertReadableStreamType(type, `${context} has member 'type' that`)
+    };
+}
+function convertUnderlyingSourceCancelCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (reason) => promiseCall(fn, original, [reason]);
+}
+function convertUnderlyingSourcePullCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (controller) => promiseCall(fn, original, [controller]);
+}
+function convertUnderlyingSourceStartCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (controller) => reflectCall(fn, original, [controller]);
+}
+function convertReadableStreamType(type, context) {
+    type = `${type}`;
+    if (type !== 'bytes') {
+        throw new TypeError(`${context} '${type}' is not a valid enumeration value for ReadableStreamType`);
+    }
+    return type;
+}
+
+function convertReaderOptions(options, context) {
+    assertDictionary(options, context);
+    const mode = options === null || options === void 0 ? void 0 : options.mode;
+    return {
+        mode: mode === undefined ? undefined : convertReadableStreamReaderMode(mode, `${context} has member 'mode' that`)
+    };
+}
+function convertReadableStreamReaderMode(mode, context) {
+    mode = `${mode}`;
+    if (mode !== 'byob') {
+        throw new TypeError(`${context} '${mode}' is not a valid enumeration value for ReadableStreamReaderMode`);
+    }
+    return mode;
+}
+
+function convertIteratorOptions(options, context) {
+    assertDictionary(options, context);
+    const preventCancel = options === null || options === void 0 ? void 0 : options.preventCancel;
+    return { preventCancel: Boolean(preventCancel) };
+}
+
+function convertPipeOptions(options, context) {
+    assertDictionary(options, context);
+    const preventAbort = options === null || options === void 0 ? void 0 : options.preventAbort;
+    const preventCancel = options === null || options === void 0 ? void 0 : options.preventCancel;
+    const preventClose = options === null || options === void 0 ? void 0 : options.preventClose;
+    const signal = options === null || options === void 0 ? void 0 : options.signal;
+    if (signal !== undefined) {
+        assertAbortSignal(signal, `${context} has member 'signal' that`);
+    }
+    return {
+        preventAbort: Boolean(preventAbort),
+        preventCancel: Boolean(preventCancel),
+        preventClose: Boolean(preventClose),
+        signal
+    };
+}
+function assertAbortSignal(signal, context) {
+    if (!isAbortSignal(signal)) {
+        throw new TypeError(`${context} is not an AbortSignal.`);
+    }
+}
+
+function convertReadableWritablePair(pair, context) {
+    assertDictionary(pair, context);
+    const readable = pair === null || pair === void 0 ? void 0 : pair.readable;
+    assertRequiredField(readable, 'readable', 'ReadableWritablePair');
+    assertReadableStream(readable, `${context} has member 'readable' that`);
+    const writable = pair === null || pair === void 0 ? void 0 : pair.writable;
+    assertRequiredField(writable, 'writable', 'ReadableWritablePair');
+    assertWritableStream(writable, `${context} has member 'writable' that`);
+    return { readable, writable };
+}
+
+/**
+ * A readable stream represents a source of data, from which you can read.
+ *
+ * @public
+ */
+class ReadableStream {
+    constructor(rawUnderlyingSource = {}, rawStrategy = {}) {
+        if (rawUnderlyingSource === undefined) {
+            rawUnderlyingSource = null;
+        }
+        else {
+            assertObject(rawUnderlyingSource, 'First parameter');
+        }
+        const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');
+        const underlyingSource = convertUnderlyingDefaultOrByteSource(rawUnderlyingSource, 'First parameter');
+        InitializeReadableStream(this);
+        if (underlyingSource.type === 'bytes') {
+            if (strategy.size !== undefined) {
+                throw new RangeError('The strategy for a byte stream cannot have a size function');
+            }
+            const highWaterMark = ExtractHighWaterMark(strategy, 0);
+            SetUpReadableByteStreamControllerFromUnderlyingSource(this, underlyingSource, highWaterMark);
+        }
+        else {
+            const sizeAlgorithm = ExtractSizeAlgorithm(strategy);
+            const highWaterMark = ExtractHighWaterMark(strategy, 1);
+            SetUpReadableStreamDefaultControllerFromUnderlyingSource(this, underlyingSource, highWaterMark, sizeAlgorithm);
+        }
+    }
+    /**
+     * Whether or not the readable stream is locked to a {@link ReadableStreamDefaultReader | reader}.
+     */
+    get locked() {
+        if (!IsReadableStream(this)) {
+            throw streamBrandCheckException$1('locked');
+        }
+        return IsReadableStreamLocked(this);
+    }
+    /**
+     * Cancels the stream, signaling a loss of interest in the stream by a consumer.
+     *
+     * The supplied `reason` argument will be given to the underlying source's {@link UnderlyingSource.cancel | cancel()}
+     * method, which might or might not use it.
+     */
+    cancel(reason = undefined) {
+        if (!IsReadableStream(this)) {
+            return promiseRejectedWith(streamBrandCheckException$1('cancel'));
+        }
+        if (IsReadableStreamLocked(this)) {
+            return promiseRejectedWith(new TypeError('Cannot cancel a stream that already has a reader'));
+        }
+        return ReadableStreamCancel(this, reason);
+    }
+    getReader(rawOptions = undefined) {
+        if (!IsReadableStream(this)) {
+            throw streamBrandCheckException$1('getReader');
+        }
+        const options = convertReaderOptions(rawOptions, 'First parameter');
+        if (options.mode === undefined) {
+            return AcquireReadableStreamDefaultReader(this);
+        }
+        return AcquireReadableStreamBYOBReader(this);
+    }
+    pipeThrough(rawTransform, rawOptions = {}) {
+        if (!IsReadableStream(this)) {
+            throw streamBrandCheckException$1('pipeThrough');
+        }
+        assertRequiredArgument(rawTransform, 1, 'pipeThrough');
+        const transform = convertReadableWritablePair(rawTransform, 'First parameter');
+        const options = convertPipeOptions(rawOptions, 'Second parameter');
+        if (IsReadableStreamLocked(this)) {
+            throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked ReadableStream');
+        }
+        if (IsWritableStreamLocked(transform.writable)) {
+            throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked WritableStream');
+        }
+        const promise = ReadableStreamPipeTo(this, transform.writable, options.preventClose, options.preventAbort, options.preventCancel, options.signal);
+        setPromiseIsHandledToTrue(promise);
+        return transform.readable;
+    }
+    pipeTo(destination, rawOptions = {}) {
+        if (!IsReadableStream(this)) {
+            return promiseRejectedWith(streamBrandCheckException$1('pipeTo'));
+        }
+        if (destination === undefined) {
+            return promiseRejectedWith(`Parameter 1 is required in 'pipeTo'.`);
+        }
+        if (!IsWritableStream(destination)) {
+            return promiseRejectedWith(new TypeError(`ReadableStream.prototype.pipeTo's first argument must be a WritableStream`));
+        }
+        let options;
+        try {
+            options = convertPipeOptions(rawOptions, 'Second parameter');
+        }
+        catch (e) {
+            return promiseRejectedWith(e);
+        }
+        if (IsReadableStreamLocked(this)) {
+            return promiseRejectedWith(new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream'));
+        }
+        if (IsWritableStreamLocked(destination)) {
+            return promiseRejectedWith(new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream'));
+        }
+        return ReadableStreamPipeTo(this, destination, options.preventClose, options.preventAbort, options.preventCancel, options.signal);
+    }
+    /**
+     * Tees this readable stream, returning a two-element array containing the two resulting branches as
+     * new {@link ReadableStream} instances.
+     *
+     * Teeing a stream will lock it, preventing any other consumer from acquiring a reader.
+     * To cancel the stream, cancel both of the resulting branches; a composite cancellation reason will then be
+     * propagated to the stream's underlying source.
+     *
+     * Note that the chunks seen in each branch will be the same object. If the chunks are not immutable,
+     * this could allow interference between the two branches.
+     */
+    tee() {
+        if (!IsReadableStream(this)) {
+            throw streamBrandCheckException$1('tee');
+        }
+        const branches = ReadableStreamTee(this);
+        return CreateArrayFromList(branches);
+    }
+    values(rawOptions = undefined) {
+        if (!IsReadableStream(this)) {
+            throw streamBrandCheckException$1('values');
+        }
+        const options = convertIteratorOptions(rawOptions, 'First parameter');
+        return AcquireReadableStreamAsyncIterator(this, options.preventCancel);
+    }
+}
+Object.defineProperties(ReadableStream.prototype, {
+    cancel: { enumerable: true },
+    getReader: { enumerable: true },
+    pipeThrough: { enumerable: true },
+    pipeTo: { enumerable: true },
+    tee: { enumerable: true },
+    values: { enumerable: true },
+    locked: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableStream.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableStream',
+        configurable: true
+    });
+}
+if (typeof SymbolPolyfill.asyncIterator === 'symbol') {
+    Object.defineProperty(ReadableStream.prototype, SymbolPolyfill.asyncIterator, {
+        value: ReadableStream.prototype.values,
+        writable: true,
+        configurable: true
+    });
+}
+// Abstract operations for the ReadableStream.
+// Throws if and only if startAlgorithm throws.
+function CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark = 1, sizeAlgorithm = () => 1) {
+    const stream = Object.create(ReadableStream.prototype);
+    InitializeReadableStream(stream);
+    const controller = Object.create(ReadableStreamDefaultController.prototype);
+    SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm);
+    return stream;
+}
+// Throws if and only if startAlgorithm throws.
+function CreateReadableByteStream(startAlgorithm, pullAlgorithm, cancelAlgorithm) {
+    const stream = Object.create(ReadableStream.prototype);
+    InitializeReadableStream(stream);
+    const controller = Object.create(ReadableByteStreamController.prototype);
+    SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, 0, undefined);
+    return stream;
+}
+function InitializeReadableStream(stream) {
+    stream._state = 'readable';
+    stream._reader = undefined;
+    stream._storedError = undefined;
+    stream._disturbed = false;
+}
+function IsReadableStream(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_readableStreamController')) {
+        return false;
+    }
+    return x instanceof ReadableStream;
+}
+function IsReadableStreamLocked(stream) {
+    if (stream._reader === undefined) {
+        return false;
+    }
+    return true;
+}
+// ReadableStream API exposed for controllers.
+function ReadableStreamCancel(stream, reason) {
+    stream._disturbed = true;
+    if (stream._state === 'closed') {
+        return promiseResolvedWith(undefined);
+    }
+    if (stream._state === 'errored') {
+        return promiseRejectedWith(stream._storedError);
+    }
+    ReadableStreamClose(stream);
+    const reader = stream._reader;
+    if (reader !== undefined && IsReadableStreamBYOBReader(reader)) {
+        reader._readIntoRequests.forEach(readIntoRequest => {
+            readIntoRequest._closeSteps(undefined);
+        });
+        reader._readIntoRequests = new SimpleQueue();
+    }
+    const sourceCancelPromise = stream._readableStreamController[CancelSteps](reason);
+    return transformPromiseWith(sourceCancelPromise, noop);
+}
+function ReadableStreamClose(stream) {
+    stream._state = 'closed';
+    const reader = stream._reader;
+    if (reader === undefined) {
+        return;
+    }
+    defaultReaderClosedPromiseResolve(reader);
+    if (IsReadableStreamDefaultReader(reader)) {
+        reader._readRequests.forEach(readRequest => {
+            readRequest._closeSteps();
+        });
+        reader._readRequests = new SimpleQueue();
+    }
+}
+function ReadableStreamError(stream, e) {
+    stream._state = 'errored';
+    stream._storedError = e;
+    const reader = stream._reader;
+    if (reader === undefined) {
+        return;
+    }
+    defaultReaderClosedPromiseReject(reader, e);
+    if (IsReadableStreamDefaultReader(reader)) {
+        reader._readRequests.forEach(readRequest => {
+            readRequest._errorSteps(e);
+        });
+        reader._readRequests = new SimpleQueue();
+    }
+    else {
+        reader._readIntoRequests.forEach(readIntoRequest => {
+            readIntoRequest._errorSteps(e);
+        });
+        reader._readIntoRequests = new SimpleQueue();
+    }
+}
+// Helper functions for the ReadableStream.
+function streamBrandCheckException$1(name) {
+    return new TypeError(`ReadableStream.prototype.${name} can only be used on a ReadableStream`);
+}
+
+function convertQueuingStrategyInit(init, context) {
+    assertDictionary(init, context);
+    const highWaterMark = init === null || init === void 0 ? void 0 : init.highWaterMark;
+    assertRequiredField(highWaterMark, 'highWaterMark', 'QueuingStrategyInit');
+    return {
+        highWaterMark: convertUnrestrictedDouble(highWaterMark)
+    };
+}
+
+// The size function must not have a prototype property nor be a constructor
+const byteLengthSizeFunction = (chunk) => {
+    return chunk.byteLength;
+};
+try {
+    Object.defineProperty(byteLengthSizeFunction, 'name', {
+        value: 'size',
+        configurable: true
+    });
+}
+catch (_a) {
+    // This property is non-configurable in older browsers, so ignore if this throws.
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility
+}
+/**
+ * A queuing strategy that counts the number of bytes in each chunk.
+ *
+ * @public
+ */
+class ByteLengthQueuingStrategy {
+    constructor(options) {
+        assertRequiredArgument(options, 1, 'ByteLengthQueuingStrategy');
+        options = convertQueuingStrategyInit(options, 'First parameter');
+        this._byteLengthQueuingStrategyHighWaterMark = options.highWaterMark;
+    }
+    /**
+     * Returns the high water mark provided to the constructor.
+     */
+    get highWaterMark() {
+        if (!IsByteLengthQueuingStrategy(this)) {
+            throw byteLengthBrandCheckException('highWaterMark');
+        }
+        return this._byteLengthQueuingStrategyHighWaterMark;
+    }
+    /**
+     * Measures the size of `chunk` by returning the value of its `byteLength` property.
+     */
+    get size() {
+        if (!IsByteLengthQueuingStrategy(this)) {
+            throw byteLengthBrandCheckException('size');
+        }
+        return byteLengthSizeFunction;
+    }
+}
+Object.defineProperties(ByteLengthQueuingStrategy.prototype, {
+    highWaterMark: { enumerable: true },
+    size: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ByteLengthQueuingStrategy.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ByteLengthQueuingStrategy',
+        configurable: true
+    });
+}
+// Helper functions for the ByteLengthQueuingStrategy.
+function byteLengthBrandCheckException(name) {
+    return new TypeError(`ByteLengthQueuingStrategy.prototype.${name} can only be used on a ByteLengthQueuingStrategy`);
+}
+function IsByteLengthQueuingStrategy(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_byteLengthQueuingStrategyHighWaterMark')) {
+        return false;
+    }
+    return x instanceof ByteLengthQueuingStrategy;
+}
+
+// The size function must not have a prototype property nor be a constructor
+const countSizeFunction = () => {
+    return 1;
+};
+try {
+    Object.defineProperty(countSizeFunction, 'name', {
+        value: 'size',
+        configurable: true
+    });
+}
+catch (_a) {
+    // This property is non-configurable in older browsers, so ignore if this throws.
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility
+}
+/**
+ * A queuing strategy that counts the number of chunks.
+ *
+ * @public
+ */
+class CountQueuingStrategy {
+    constructor(options) {
+        assertRequiredArgument(options, 1, 'CountQueuingStrategy');
+        options = convertQueuingStrategyInit(options, 'First parameter');
+        this._countQueuingStrategyHighWaterMark = options.highWaterMark;
+    }
+    /**
+     * Returns the high water mark provided to the constructor.
+     */
+    get highWaterMark() {
+        if (!IsCountQueuingStrategy(this)) {
+            throw countBrandCheckException('highWaterMark');
+        }
+        return this._countQueuingStrategyHighWaterMark;
+    }
+    /**
+     * Measures the size of `chunk` by always returning 1.
+     * This ensures that the total queue size is a count of the number of chunks in the queue.
+     */
+    get size() {
+        if (!IsCountQueuingStrategy(this)) {
+            throw countBrandCheckException('size');
+        }
+        return countSizeFunction;
+    }
+}
+Object.defineProperties(CountQueuingStrategy.prototype, {
+    highWaterMark: { enumerable: true },
+    size: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(CountQueuingStrategy.prototype, SymbolPolyfill.toStringTag, {
+        value: 'CountQueuingStrategy',
+        configurable: true
+    });
+}
+// Helper functions for the CountQueuingStrategy.
+function countBrandCheckException(name) {
+    return new TypeError(`CountQueuingStrategy.prototype.${name} can only be used on a CountQueuingStrategy`);
+}
+function IsCountQueuingStrategy(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_countQueuingStrategyHighWaterMark')) {
+        return false;
+    }
+    return x instanceof CountQueuingStrategy;
+}
+
+function convertTransformer(original, context) {
+    assertDictionary(original, context);
+    const flush = original === null || original === void 0 ? void 0 : original.flush;
+    const readableType = original === null || original === void 0 ? void 0 : original.readableType;
+    const start = original === null || original === void 0 ? void 0 : original.start;
+    const transform = original === null || original === void 0 ? void 0 : original.transform;
+    const writableType = original === null || original === void 0 ? void 0 : original.writableType;
+    return {
+        flush: flush === undefined ?
+            undefined :
+            convertTransformerFlushCallback(flush, original, `${context} has member 'flush' that`),
+        readableType,
+        start: start === undefined ?
+            undefined :
+            convertTransformerStartCallback(start, original, `${context} has member 'start' that`),
+        transform: transform === undefined ?
+            undefined :
+            convertTransformerTransformCallback(transform, original, `${context} has member 'transform' that`),
+        writableType
+    };
+}
+function convertTransformerFlushCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (controller) => promiseCall(fn, original, [controller]);
+}
+function convertTransformerStartCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (controller) => reflectCall(fn, original, [controller]);
+}
+function convertTransformerTransformCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (chunk, controller) => promiseCall(fn, original, [chunk, controller]);
+}
+
+// Class TransformStream
+/**
+ * A transform stream consists of a pair of streams: a {@link WritableStream | writable stream},
+ * known as its writable side, and a {@link ReadableStream | readable stream}, known as its readable side.
+ * In a manner specific to the transform stream in question, writes to the writable side result in new data being
+ * made available for reading from the readable side.
+ *
+ * @public
+ */
+class TransformStream {
+    constructor(rawTransformer = {}, rawWritableStrategy = {}, rawReadableStrategy = {}) {
+        if (rawTransformer === undefined) {
+            rawTransformer = null;
+        }
+        const writableStrategy = convertQueuingStrategy(rawWritableStrategy, 'Second parameter');
+        const readableStrategy = convertQueuingStrategy(rawReadableStrategy, 'Third parameter');
+        const transformer = convertTransformer(rawTransformer, 'First parameter');
+        if (transformer.readableType !== undefined) {
+            throw new RangeError('Invalid readableType specified');
+        }
+        if (transformer.writableType !== undefined) {
+            throw new RangeError('Invalid writableType specified');
+        }
+        const readableHighWaterMark = ExtractHighWaterMark(readableStrategy, 0);
+        const readableSizeAlgorithm = ExtractSizeAlgorithm(readableStrategy);
+        const writableHighWaterMark = ExtractHighWaterMark(writableStrategy, 1);
+        const writableSizeAlgorithm = ExtractSizeAlgorithm(writableStrategy);
+        let startPromise_resolve;
+        const startPromise = newPromise(resolve => {
+            startPromise_resolve = resolve;
+        });
+        InitializeTransformStream(this, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm);
+        SetUpTransformStreamDefaultControllerFromTransformer(this, transformer);
+        if (transformer.start !== undefined) {
+            startPromise_resolve(transformer.start(this._transformStreamController));
+        }
+        else {
+            startPromise_resolve(undefined);
+        }
+    }
+    /**
+     * The readable side of the transform stream.
+     */
+    get readable() {
+        if (!IsTransformStream(this)) {
+            throw streamBrandCheckException('readable');
+        }
+        return this._readable;
+    }
+    /**
+     * The writable side of the transform stream.
+     */
+    get writable() {
+        if (!IsTransformStream(this)) {
+            throw streamBrandCheckException('writable');
+        }
+        return this._writable;
+    }
+}
+Object.defineProperties(TransformStream.prototype, {
+    readable: { enumerable: true },
+    writable: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(TransformStream.prototype, SymbolPolyfill.toStringTag, {
+        value: 'TransformStream',
+        configurable: true
+    });
+}
+function InitializeTransformStream(stream, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm) {
+    function startAlgorithm() {
+        return startPromise;
+    }
+    function writeAlgorithm(chunk) {
+        return TransformStreamDefaultSinkWriteAlgorithm(stream, chunk);
+    }
+    function abortAlgorithm(reason) {
+        return TransformStreamDefaultSinkAbortAlgorithm(stream, reason);
+    }
+    function closeAlgorithm() {
+        return TransformStreamDefaultSinkCloseAlgorithm(stream);
+    }
+    stream._writable = CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, writableHighWaterMark, writableSizeAlgorithm);
+    function pullAlgorithm() {
+        return TransformStreamDefaultSourcePullAlgorithm(stream);
+    }
+    function cancelAlgorithm(reason) {
+        TransformStreamErrorWritableAndUnblockWrite(stream, reason);
+        return promiseResolvedWith(undefined);
+    }
+    stream._readable = CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, readableHighWaterMark, readableSizeAlgorithm);
+    // The [[backpressure]] slot is set to undefined so that it can be initialised by TransformStreamSetBackpressure.
+    stream._backpressure = undefined;
+    stream._backpressureChangePromise = undefined;
+    stream._backpressureChangePromise_resolve = undefined;
+    TransformStreamSetBackpressure(stream, true);
+    stream._transformStreamController = undefined;
+}
+function IsTransformStream(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_transformStreamController')) {
+        return false;
+    }
+    return x instanceof TransformStream;
+}
+// This is a no-op if both sides are already errored.
+function TransformStreamError(stream, e) {
+    ReadableStreamDefaultControllerError(stream._readable._readableStreamController, e);
+    TransformStreamErrorWritableAndUnblockWrite(stream, e);
+}
+function TransformStreamErrorWritableAndUnblockWrite(stream, e) {
+    TransformStreamDefaultControllerClearAlgorithms(stream._transformStreamController);
+    WritableStreamDefaultControllerErrorIfNeeded(stream._writable._writableStreamController, e);
+    if (stream._backpressure) {
+        // Pretend that pull() was called to permit any pending write() calls to complete. TransformStreamSetBackpressure()
+        // cannot be called from enqueue() or pull() once the ReadableStream is errored, so this will will be the final time
+        // _backpressure is set.
+        TransformStreamSetBackpressure(stream, false);
+    }
+}
+function TransformStreamSetBackpressure(stream, backpressure) {
+    // Passes also when called during construction.
+    if (stream._backpressureChangePromise !== undefined) {
+        stream._backpressureChangePromise_resolve();
+    }
+    stream._backpressureChangePromise = newPromise(resolve => {
+        stream._backpressureChangePromise_resolve = resolve;
+    });
+    stream._backpressure = backpressure;
+}
+// Class TransformStreamDefaultController
+/**
+ * Allows control of the {@link ReadableStream} and {@link WritableStream} of the associated {@link TransformStream}.
+ *
+ * @public
+ */
+class TransformStreamDefaultController {
+    constructor() {
+        throw new TypeError('Illegal constructor');
+    }
+    /**
+     * Returns the desired size to fill the readable side’s internal queue. It can be negative, if the queue is over-full.
+     */
+    get desiredSize() {
+        if (!IsTransformStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException('desiredSize');
+        }
+        const readableController = this._controlledTransformStream._readable._readableStreamController;
+        return ReadableStreamDefaultControllerGetDesiredSize(readableController);
+    }
+    enqueue(chunk = undefined) {
+        if (!IsTransformStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException('enqueue');
+        }
+        TransformStreamDefaultControllerEnqueue(this, chunk);
+    }
+    /**
+     * Errors both the readable side and the writable side of the controlled transform stream, making all future
+     * interactions with it fail with the given error `e`. Any chunks queued for transformation will be discarded.
+     */
+    error(reason = undefined) {
+        if (!IsTransformStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException('error');
+        }
+        TransformStreamDefaultControllerError(this, reason);
+    }
+    /**
+     * Closes the readable side and errors the writable side of the controlled transform stream. This is useful when the
+     * transformer only needs to consume a portion of the chunks written to the writable side.
+     */
+    terminate() {
+        if (!IsTransformStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException('terminate');
+        }
+        TransformStreamDefaultControllerTerminate(this);
+    }
+}
+Object.defineProperties(TransformStreamDefaultController.prototype, {
+    enqueue: { enumerable: true },
+    error: { enumerable: true },
+    terminate: { enumerable: true },
+    desiredSize: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(TransformStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+        value: 'TransformStreamDefaultController',
+        configurable: true
+    });
+}
+// Transform Stream Default Controller Abstract Operations
+function IsTransformStreamDefaultController(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_controlledTransformStream')) {
+        return false;
+    }
+    return x instanceof TransformStreamDefaultController;
+}
+function SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm) {
+    controller._controlledTransformStream = stream;
+    stream._transformStreamController = controller;
+    controller._transformAlgorithm = transformAlgorithm;
+    controller._flushAlgorithm = flushAlgorithm;
+}
+function SetUpTransformStreamDefaultControllerFromTransformer(stream, transformer) {
+    const controller = Object.create(TransformStreamDefaultController.prototype);
+    let transformAlgorithm = (chunk) => {
+        try {
+            TransformStreamDefaultControllerEnqueue(controller, chunk);
+            return promiseResolvedWith(undefined);
+        }
+        catch (transformResultE) {
+            return promiseRejectedWith(transformResultE);
+        }
+    };
+    let flushAlgorithm = () => promiseResolvedWith(undefined);
+    if (transformer.transform !== undefined) {
+        transformAlgorithm = chunk => transformer.transform(chunk, controller);
+    }
+    if (transformer.flush !== undefined) {
+        flushAlgorithm = () => transformer.flush(controller);
+    }
+    SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);
+}
+function TransformStreamDefaultControllerClearAlgorithms(controller) {
+    controller._transformAlgorithm = undefined;
+    controller._flushAlgorithm = undefined;
+}
+function TransformStreamDefaultControllerEnqueue(controller, chunk) {
+    const stream = controller._controlledTransformStream;
+    const readableController = stream._readable._readableStreamController;
+    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(readableController)) {
+        throw new TypeError('Readable side is not in a state that permits enqueue');
+    }
+    // We throttle transform invocations based on the backpressure of the ReadableStream, but we still
+    // accept TransformStreamDefaultControllerEnqueue() calls.
+    try {
+        ReadableStreamDefaultControllerEnqueue(readableController, chunk);
+    }
+    catch (e) {
+        // This happens when readableStrategy.size() throws.
+        TransformStreamErrorWritableAndUnblockWrite(stream, e);
+        throw stream._readable._storedError;
+    }
+    const backpressure = ReadableStreamDefaultControllerHasBackpressure(readableController);
+    if (backpressure !== stream._backpressure) {
+        TransformStreamSetBackpressure(stream, true);
+    }
+}
+function TransformStreamDefaultControllerError(controller, e) {
+    TransformStreamError(controller._controlledTransformStream, e);
+}
+function TransformStreamDefaultControllerPerformTransform(controller, chunk) {
+    const transformPromise = controller._transformAlgorithm(chunk);
+    return transformPromiseWith(transformPromise, undefined, r => {
+        TransformStreamError(controller._controlledTransformStream, r);
+        throw r;
+    });
+}
+function TransformStreamDefaultControllerTerminate(controller) {
+    const stream = controller._controlledTransformStream;
+    const readableController = stream._readable._readableStreamController;
+    ReadableStreamDefaultControllerClose(readableController);
+    const error = new TypeError('TransformStream terminated');
+    TransformStreamErrorWritableAndUnblockWrite(stream, error);
+}
+// TransformStreamDefaultSink Algorithms
+function TransformStreamDefaultSinkWriteAlgorithm(stream, chunk) {
+    const controller = stream._transformStreamController;
+    if (stream._backpressure) {
+        const backpressureChangePromise = stream._backpressureChangePromise;
+        return transformPromiseWith(backpressureChangePromise, () => {
+            const writable = stream._writable;
+            const state = writable._state;
+            if (state === 'erroring') {
+                throw writable._storedError;
+            }
+            return TransformStreamDefaultControllerPerformTransform(controller, chunk);
+        });
+    }
+    return TransformStreamDefaultControllerPerformTransform(controller, chunk);
+}
+function TransformStreamDefaultSinkAbortAlgorithm(stream, reason) {
+    // abort() is not called synchronously, so it is possible for abort() to be called when the stream is already
+    // errored.
+    TransformStreamError(stream, reason);
+    return promiseResolvedWith(undefined);
+}
+function TransformStreamDefaultSinkCloseAlgorithm(stream) {
+    // stream._readable cannot change after construction, so caching it across a call to user code is safe.
+    const readable = stream._readable;
+    const controller = stream._transformStreamController;
+    const flushPromise = controller._flushAlgorithm();
+    TransformStreamDefaultControllerClearAlgorithms(controller);
+    // Return a promise that is fulfilled with undefined on success.
+    return transformPromiseWith(flushPromise, () => {
+        if (readable._state === 'errored') {
+            throw readable._storedError;
+        }
+        ReadableStreamDefaultControllerClose(readable._readableStreamController);
+    }, r => {
+        TransformStreamError(stream, r);
+        throw readable._storedError;
+    });
+}
+// TransformStreamDefaultSource Algorithms
+function TransformStreamDefaultSourcePullAlgorithm(stream) {
+    // Invariant. Enforced by the promises returned by start() and pull().
+    TransformStreamSetBackpressure(stream, false);
+    // Prevent the next pull() call until there is backpressure.
+    return stream._backpressureChangePromise;
+}
+// Helper functions for the TransformStreamDefaultController.
+function defaultControllerBrandCheckException(name) {
+    return new TypeError(`TransformStreamDefaultController.prototype.${name} can only be used on a TransformStreamDefaultController`);
+}
+// Helper functions for the TransformStream.
+function streamBrandCheckException(name) {
+    return new TypeError(`TransformStream.prototype.${name} can only be used on a TransformStream`);
+}
+
+const exports = {
+    ReadableStream,
+    ReadableStreamDefaultController,
+    ReadableByteStreamController,
+    ReadableStreamBYOBRequest,
+    ReadableStreamDefaultReader,
+    ReadableStreamBYOBReader,
+    WritableStream,
+    WritableStreamDefaultController,
+    WritableStreamDefaultWriter,
+    ByteLengthQueuingStrategy,
+    CountQueuingStrategy,
+    TransformStream,
+    TransformStreamDefaultController
+};
+// Add classes to global scope
+if (typeof globals !== 'undefined') {
+    for (const prop in exports) {
+        if (Object.prototype.hasOwnProperty.call(exports, prop)) {
+            Object.defineProperty(globals, prop, {
+                value: exports[prop],
+                writable: true,
+                configurable: true
+            });
+        }
+    }
+}
+
+export { ByteLengthQueuingStrategy, CountQueuingStrategy, ReadableByteStreamController, ReadableStream, ReadableStreamBYOBReader, ReadableStreamBYOBRequest, ReadableStreamDefaultController, ReadableStreamDefaultReader, TransformStream, TransformStreamDefaultController, WritableStream, WritableStreamDefaultController, WritableStreamDefaultWriter };
+//# sourceMappingURL=polyfill.es6.mjs.map
diff --git a/node_modules/web-streams-polyfill/dist/polyfill.es6.mjs.map b/node_modules/web-streams-polyfill/dist/polyfill.es6.mjs.map
new file mode 100644
index 0000000..4eeea29
--- /dev/null
+++ b/node_modules/web-streams-polyfill/dist/polyfill.es6.mjs.map
@@ -0,0 +1 @@
+{"version":3,"file":"polyfill.es6.mjs","sources":["../src/stub/symbol.ts","../src/utils.ts","../src/lib/helpers/miscellaneous.ts","../src/lib/helpers/webidl.ts","../src/lib/simple-queue.ts","../src/lib/readable-stream/generic-reader.ts","../src/lib/abstract-ops/internal-methods.ts","../src/stub/number-isfinite.ts","../src/stub/math-trunc.ts","../src/lib/validators/basic.ts","../src/lib/validators/readable-stream.ts","../src/lib/readable-stream/default-reader.ts","../src/target/es5/stub/async-iterator-prototype.ts","../src/lib/readable-stream/async-iterator.ts","../src/stub/number-isnan.ts","../src/lib/abstract-ops/ecmascript.ts","../src/lib/abstract-ops/miscellaneous.ts","../src/lib/abstract-ops/queue-with-sizes.ts","../src/lib/readable-stream/byte-stream-controller.ts","../src/lib/readable-stream/byob-reader.ts","../src/lib/abstract-ops/queuing-strategy.ts","../src/lib/validators/queuing-strategy.ts","../src/lib/validators/underlying-sink.ts","../src/lib/validators/writable-stream.ts","../src/lib/abort-signal.ts","../src/lib/writable-stream.ts","../src/stub/native.ts","../src/stub/dom-exception.ts","../src/lib/readable-stream/pipe.ts","../src/lib/readable-stream/default-controller.ts","../src/lib/readable-stream/tee.ts","../src/lib/validators/underlying-source.ts","../src/lib/validators/reader-options.ts","../src/lib/validators/iterator-options.ts","../src/lib/validators/pipe-options.ts","../src/lib/validators/readable-writable-pair.ts","../src/lib/readable-stream.ts","../src/lib/validators/queuing-strategy-init.ts","../src/lib/byte-length-queuing-strategy.ts","../src/lib/count-queuing-strategy.ts","../src/lib/validators/transformer.ts","../src/lib/transform-stream.ts","../src/polyfill.ts"],"sourcesContent":["/// <reference lib=\"es2015.symbol\" />\n\nconst SymbolPolyfill: (description?: string) => symbol =\n  typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol' ?\n    Symbol :\n    description => `Symbol(${description})` as any as symbol;\n\nexport default SymbolPolyfill;\n","/// <reference lib=\"dom\" />\n\nexport function noop(): undefined {\n  return undefined;\n}\n\nfunction getGlobals() {\n  if (typeof self !== 'undefined') {\n    return self;\n  } else if (typeof window !== 'undefined') {\n    return window;\n  } else if (typeof global !== 'undefined') {\n    return global;\n  }\n  return undefined;\n}\n\nexport const globals = getGlobals();\n","import { noop } from '../../utils';\nimport { AssertionError } from '../../stub/assert';\n\nexport function typeIsObject(x: any): x is object {\n  return (typeof x === 'object' && x !== null) || typeof x === 'function';\n}\n\nexport const rethrowAssertionErrorRejection: (e: any) => void =\n  DEBUG ? e => {\n    // Used throughout the reference implementation, as `.catch(rethrowAssertionErrorRejection)`, to ensure any errors\n    // get shown. There are places in the spec where we do promise transformations and purposefully ignore or don't\n    // expect any errors, but assertion errors are always problematic.\n    if (e && e instanceof AssertionError) {\n      setTimeout(() => {\n        throw e;\n      }, 0);\n    }\n  } : noop;\n","import { globals } from '../../utils';\nimport { rethrowAssertionErrorRejection } from './miscellaneous';\nimport assert from '../../stub/assert';\n\nconst originalPromise = Promise;\nconst originalPromiseThen = Promise.prototype.then;\nconst originalPromiseResolve = Promise.resolve.bind(originalPromise);\nconst originalPromiseReject = Promise.reject.bind(originalPromise);\n\nexport function newPromise<T>(executor: (\n  resolve: (value: T | PromiseLike<T>) => void,\n  reject: (reason?: any) => void\n) => void): Promise<T> {\n  return new originalPromise(executor);\n}\n\nexport function promiseResolvedWith<T>(value: T | PromiseLike<T>): Promise<T> {\n  return originalPromiseResolve(value);\n}\n\nexport function promiseRejectedWith<T = never>(reason: any): Promise<T> {\n  return originalPromiseReject(reason);\n}\n\nexport function PerformPromiseThen<T, TResult1 = T, TResult2 = never>(\n  promise: Promise<T>,\n  onFulfilled?: (value: T) => TResult1 | PromiseLike<TResult1>,\n  onRejected?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2> {\n  // There doesn't appear to be any way to correctly emulate the behaviour from JavaScript, so this is just an\n  // approximation.\n  return originalPromiseThen.call(promise, onFulfilled, onRejected) as Promise<TResult1 | TResult2>;\n}\n\nexport function uponPromise<T>(\n  promise: Promise<T>,\n  onFulfilled?: (value: T) => void | PromiseLike<void>,\n  onRejected?: (reason: any) => void | PromiseLike<void>): void {\n  PerformPromiseThen(\n    PerformPromiseThen(promise, onFulfilled, onRejected),\n    undefined,\n    rethrowAssertionErrorRejection\n  );\n}\n\nexport function uponFulfillment<T>(promise: Promise<T>, onFulfilled: (value: T) => void | PromiseLike<void>): void {\n  uponPromise(promise, onFulfilled);\n}\n\nexport function uponRejection(promise: Promise<unknown>, onRejected: (reason: any) => void | PromiseLike<void>): void {\n  uponPromise(promise, undefined, onRejected);\n}\n\nexport function transformPromiseWith<T, TResult1 = T, TResult2 = never>(\n  promise: Promise<T>,\n  fulfillmentHandler?: (value: T) => TResult1 | PromiseLike<TResult1>,\n  rejectionHandler?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2> {\n  return PerformPromiseThen(promise, fulfillmentHandler, rejectionHandler);\n}\n\nexport function setPromiseIsHandledToTrue(promise: Promise<unknown>): void {\n  PerformPromiseThen(promise, undefined, rethrowAssertionErrorRejection);\n}\n\nexport const queueMicrotask: (fn: () => void) => void = (() => {\n  const globalQueueMicrotask = globals && globals.queueMicrotask;\n  if (typeof globalQueueMicrotask === 'function') {\n    return globalQueueMicrotask;\n  }\n\n  const resolvedPromise = promiseResolvedWith(undefined);\n  return (fn: () => void) => PerformPromiseThen(resolvedPromise, fn);\n})();\n\nexport function reflectCall<T, A extends any[], R>(F: (this: T, ...fnArgs: A) => R, V: T, args: A): R {\n  if (typeof F !== 'function') {\n    throw new TypeError('Argument is not a function');\n  }\n  return Function.prototype.apply.call(F, V, args);\n}\n\nexport function promiseCall<T, A extends any[], R>(F: (this: T, ...fnArgs: A) => R | PromiseLike<R>,\n                                                   V: T,\n                                                   args: A): Promise<R> {\n  assert(typeof F === 'function');\n  assert(V !== undefined);\n  assert(Array.isArray(args));\n  try {\n    return promiseResolvedWith(reflectCall(F, V, args));\n  } catch (value) {\n    return promiseRejectedWith(value);\n  }\n}\n","import assert from '../stub/assert';\n\n// Original from Chromium\n// https://chromium.googlesource.com/chromium/src/+/0aee4434a4dba42a42abaea9bfbc0cd196a63bc1/third_party/blink/renderer/core/streams/SimpleQueue.js\n\nconst QUEUE_MAX_ARRAY_SIZE = 16384;\n\ninterface Node<T> {\n  _elements: T[];\n  _next: Node<T> | undefined;\n}\n\n/**\n * Simple queue structure.\n *\n * Avoids scalability issues with using a packed array directly by using\n * multiple arrays in a linked list and keeping the array size bounded.\n */\nexport class SimpleQueue<T> {\n  private _front: Node<T>;\n  private _back: Node<T>;\n  private _cursor = 0;\n  private _size = 0;\n\n  constructor() {\n    // _front and _back are always defined.\n    this._front = {\n      _elements: [],\n      _next: undefined\n    };\n    this._back = this._front;\n    // The cursor is used to avoid calling Array.shift().\n    // It contains the index of the front element of the array inside the\n    // front-most node. It is always in the range [0, QUEUE_MAX_ARRAY_SIZE).\n    this._cursor = 0;\n    // When there is only one node, size === elements.length - cursor.\n    this._size = 0;\n  }\n\n  get length(): number {\n    return this._size;\n  }\n\n  // For exception safety, this method is structured in order:\n  // 1. Read state\n  // 2. Calculate required state mutations\n  // 3. Perform state mutations\n  push(element: T): void {\n    const oldBack = this._back;\n    let newBack = oldBack;\n    assert(oldBack._next === undefined);\n    if (oldBack._elements.length === QUEUE_MAX_ARRAY_SIZE - 1) {\n      newBack = {\n        _elements: [],\n        _next: undefined\n      };\n    }\n\n    // push() is the mutation most likely to throw an exception, so it\n    // goes first.\n    oldBack._elements.push(element);\n    if (newBack !== oldBack) {\n      this._back = newBack;\n      oldBack._next = newBack;\n    }\n    ++this._size;\n  }\n\n  // Like push(), shift() follows the read -> calculate -> mutate pattern for\n  // exception safety.\n  shift(): T {\n    assert(this._size > 0); // must not be called on an empty queue\n\n    const oldFront = this._front;\n    let newFront = oldFront;\n    const oldCursor = this._cursor;\n    let newCursor = oldCursor + 1;\n\n    const elements = oldFront._elements;\n    const element = elements[oldCursor];\n\n    if (newCursor === QUEUE_MAX_ARRAY_SIZE) {\n      assert(elements.length === QUEUE_MAX_ARRAY_SIZE);\n      assert(oldFront._next !== undefined);\n      newFront = oldFront._next!;\n      newCursor = 0;\n    }\n\n    // No mutations before this point.\n    --this._size;\n    this._cursor = newCursor;\n    if (oldFront !== newFront) {\n      this._front = newFront;\n    }\n\n    // Permit shifted element to be garbage collected.\n    elements[oldCursor] = undefined!;\n\n    return element;\n  }\n\n  // The tricky thing about forEach() is that it can be called\n  // re-entrantly. The queue may be mutated inside the callback. It is easy to\n  // see that push() within the callback has no negative effects since the end\n  // of the queue is checked for on every iteration. If shift() is called\n  // repeatedly within the callback then the next iteration may return an\n  // element that has been removed. In this case the callback will be called\n  // with undefined values until we either \"catch up\" with elements that still\n  // exist or reach the back of the queue.\n  forEach(callback: (element: T) => void): void {\n    let i = this._cursor;\n    let node = this._front;\n    let elements = node._elements;\n    while (i !== elements.length || node._next !== undefined) {\n      if (i === elements.length) {\n        assert(node._next !== undefined);\n        assert(i === QUEUE_MAX_ARRAY_SIZE);\n        node = node._next!;\n        elements = node._elements;\n        i = 0;\n        if (elements.length === 0) {\n          break;\n        }\n      }\n      callback(elements[i]);\n      ++i;\n    }\n  }\n\n  // Return the element that would be returned if shift() was called now,\n  // without modifying the queue.\n  peek(): T {\n    assert(this._size > 0); // must not be called on an empty queue\n\n    const front = this._front;\n    const cursor = this._cursor;\n    return front._elements[cursor];\n  }\n}\n","import assert from '../../stub/assert';\nimport { ReadableStream, ReadableStreamCancel, ReadableStreamReader } from '../readable-stream';\nimport { newPromise, setPromiseIsHandledToTrue } from '../helpers/webidl';\n\nexport function ReadableStreamReaderGenericInitialize<R>(reader: ReadableStreamReader<R>, stream: ReadableStream<R>) {\n  reader._ownerReadableStream = stream;\n  stream._reader = reader;\n\n  if (stream._state === 'readable') {\n    defaultReaderClosedPromiseInitialize(reader);\n  } else if (stream._state === 'closed') {\n    defaultReaderClosedPromiseInitializeAsResolved(reader);\n  } else {\n    assert(stream._state === 'errored');\n\n    defaultReaderClosedPromiseInitializeAsRejected(reader, stream._storedError);\n  }\n}\n\n// A client of ReadableStreamDefaultReader and ReadableStreamBYOBReader may use these functions directly to bypass state\n// check.\n\nexport function ReadableStreamReaderGenericCancel(reader: ReadableStreamReader<any>, reason: any): Promise<undefined> {\n  const stream = reader._ownerReadableStream;\n  assert(stream !== undefined);\n  return ReadableStreamCancel(stream, reason);\n}\n\nexport function ReadableStreamReaderGenericRelease(reader: ReadableStreamReader<any>) {\n  assert(reader._ownerReadableStream !== undefined);\n  assert(reader._ownerReadableStream._reader === reader);\n\n  if (reader._ownerReadableStream._state === 'readable') {\n    defaultReaderClosedPromiseReject(\n      reader,\n      new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));\n  } else {\n    defaultReaderClosedPromiseResetToRejected(\n      reader,\n      new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));\n  }\n\n  reader._ownerReadableStream._reader = undefined;\n  reader._ownerReadableStream = undefined!;\n}\n\n// Helper functions for the readers.\n\nexport function readerLockException(name: string): TypeError {\n  return new TypeError('Cannot ' + name + ' a stream using a released reader');\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nexport function defaultReaderClosedPromiseInitialize(reader: ReadableStreamReader<any>) {\n  reader._closedPromise = newPromise((resolve, reject) => {\n    reader._closedPromise_resolve = resolve;\n    reader._closedPromise_reject = reject;\n  });\n}\n\nexport function defaultReaderClosedPromiseInitializeAsRejected(reader: ReadableStreamReader<any>, reason: any) {\n  defaultReaderClosedPromiseInitialize(reader);\n  defaultReaderClosedPromiseReject(reader, reason);\n}\n\nexport function defaultReaderClosedPromiseInitializeAsResolved(reader: ReadableStreamReader<any>) {\n  defaultReaderClosedPromiseInitialize(reader);\n  defaultReaderClosedPromiseResolve(reader);\n}\n\nexport function defaultReaderClosedPromiseReject(reader: ReadableStreamReader<any>, reason: any) {\n  if (reader._closedPromise_reject === undefined) {\n    return;\n  }\n\n  setPromiseIsHandledToTrue(reader._closedPromise);\n  reader._closedPromise_reject(reason);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n\nexport function defaultReaderClosedPromiseResetToRejected(reader: ReadableStreamReader<any>, reason: any) {\n  assert(reader._closedPromise_resolve === undefined);\n  assert(reader._closedPromise_reject === undefined);\n\n  defaultReaderClosedPromiseInitializeAsRejected(reader, reason);\n}\n\nexport function defaultReaderClosedPromiseResolve(reader: ReadableStreamReader<any>) {\n  if (reader._closedPromise_resolve === undefined) {\n    return;\n  }\n\n  reader._closedPromise_resolve(undefined);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n","export const AbortSteps = Symbol('[[AbortSteps]]');\nexport const ErrorSteps = Symbol('[[ErrorSteps]]');\nexport const CancelSteps = Symbol('[[CancelSteps]]');\nexport const PullSteps = Symbol('[[PullSteps]]');\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite#Polyfill\nconst NumberIsFinite: typeof Number.isFinite = Number.isFinite || function (x) {\n  return typeof x === 'number' && isFinite(x);\n};\n\nexport default NumberIsFinite;\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc#Polyfill\nconst MathTrunc: typeof Math.trunc = Math.trunc || function (v) {\n  return v < 0 ? Math.ceil(v) : Math.floor(v);\n};\n\nexport default MathTrunc;\n","import NumberIsFinite from '../../stub/number-isfinite';\nimport MathTrunc from '../../stub/math-trunc';\n\n// https://heycam.github.io/webidl/#idl-dictionaries\nexport function isDictionary(x: any): x is object | null {\n  return typeof x === 'object' || typeof x === 'function';\n}\n\nexport function assertDictionary(obj: unknown,\n                                 context: string): asserts obj is object | null | undefined {\n  if (obj !== undefined && !isDictionary(obj)) {\n    throw new TypeError(`${context} is not an object.`);\n  }\n}\n\nexport type AnyFunction = (...args: any[]) => any;\n\n// https://heycam.github.io/webidl/#idl-callback-functions\nexport function assertFunction(x: unknown, context: string): asserts x is AnyFunction {\n  if (typeof x !== 'function') {\n    throw new TypeError(`${context} is not a function.`);\n  }\n}\n\n// https://heycam.github.io/webidl/#idl-object\nexport function isObject(x: any): x is object {\n  return (typeof x === 'object' && x !== null) || typeof x === 'function';\n}\n\nexport function assertObject(x: unknown,\n                             context: string): asserts x is object {\n  if (!isObject(x)) {\n    throw new TypeError(`${context} is not an object.`);\n  }\n}\n\nexport function assertRequiredArgument<T extends any>(x: T | undefined,\n                                                      position: number,\n                                                      context: string): asserts x is T {\n  if (x === undefined) {\n    throw new TypeError(`Parameter ${position} is required in '${context}'.`);\n  }\n}\n\nexport function assertRequiredField<T extends any>(x: T | undefined,\n                                                   field: string,\n                                                   context: string): asserts x is T {\n  if (x === undefined) {\n    throw new TypeError(`${field} is required in '${context}'.`);\n  }\n}\n\n// https://heycam.github.io/webidl/#idl-unrestricted-double\nexport function convertUnrestrictedDouble(value: unknown): number {\n  return Number(value);\n}\n\nfunction censorNegativeZero(x: number): number {\n  return x === 0 ? 0 : x;\n}\n\nfunction integerPart(x: number): number {\n  return censorNegativeZero(MathTrunc(x));\n}\n\n// https://heycam.github.io/webidl/#idl-unsigned-long-long\nexport function convertUnsignedLongLongWithEnforceRange(value: unknown, context: string): number {\n  const lowerBound = 0;\n  const upperBound = Number.MAX_SAFE_INTEGER;\n\n  let x = Number(value);\n  x = censorNegativeZero(x);\n\n  if (!NumberIsFinite(x)) {\n    throw new TypeError(`${context} is not a finite number`);\n  }\n\n  x = integerPart(x);\n\n  if (x < lowerBound || x > upperBound) {\n    throw new TypeError(`${context} is outside the accepted range of ${lowerBound} to ${upperBound}, inclusive`);\n  }\n\n  if (!NumberIsFinite(x) || x === 0) {\n    return 0;\n  }\n\n  // TODO Use BigInt if supported?\n  // let xBigInt = BigInt(integerPart(x));\n  // xBigInt = BigInt.asUintN(64, xBigInt);\n  // return Number(xBigInt);\n\n  return x;\n}\n","import { IsReadableStream, ReadableStream } from '../readable-stream';\n\nexport function assertReadableStream(x: unknown, context: string): asserts x is ReadableStream {\n  if (!IsReadableStream(x)) {\n    throw new TypeError(`${context} is not a ReadableStream.`);\n  }\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericInitialize,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport { IsReadableStreamLocked, ReadableStream } from '../readable-stream';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { PullSteps } from '../abstract-ops/internal-methods';\nimport { newPromise, promiseRejectedWith } from '../helpers/webidl';\nimport { assertRequiredArgument } from '../validators/basic';\nimport { assertReadableStream } from '../validators/readable-stream';\n\n/**\n * A result returned by {@link ReadableStreamDefaultReader.read}.\n *\n * @public\n */\nexport type ReadableStreamDefaultReadResult<T> = {\n  done: false;\n  value: T;\n} | {\n  done: true;\n  value?: undefined;\n}\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamDefaultReader<R>(stream: ReadableStream): ReadableStreamDefaultReader<R> {\n  return new ReadableStreamDefaultReader(stream);\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamAddReadRequest<R>(stream: ReadableStream<R>,\n                                                readRequest: ReadRequest<R>): void {\n  assert(IsReadableStreamDefaultReader(stream._reader));\n  assert(stream._state === 'readable');\n\n  (stream._reader! as ReadableStreamDefaultReader<R>)._readRequests.push(readRequest);\n}\n\nexport function ReadableStreamFulfillReadRequest<R>(stream: ReadableStream<R>, chunk: R | undefined, done: boolean) {\n  const reader = stream._reader as ReadableStreamDefaultReader<R>;\n\n  assert(reader._readRequests.length > 0);\n\n  const readRequest = reader._readRequests.shift()!;\n  if (done) {\n    readRequest._closeSteps();\n  } else {\n    readRequest._chunkSteps(chunk!);\n  }\n}\n\nexport function ReadableStreamGetNumReadRequests<R>(stream: ReadableStream<R>): number {\n  return (stream._reader as ReadableStreamDefaultReader<R>)._readRequests.length;\n}\n\nexport function ReadableStreamHasDefaultReader(stream: ReadableStream): boolean {\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return false;\n  }\n\n  if (!IsReadableStreamDefaultReader(reader)) {\n    return false;\n  }\n\n  return true;\n}\n\n// Readers\n\nexport interface ReadRequest<R> {\n  _chunkSteps(chunk: R): void;\n\n  _closeSteps(): void;\n\n  _errorSteps(e: any): void;\n}\n\n/**\n * A default reader vended by a {@link ReadableStream}.\n *\n * @public\n */\nexport class ReadableStreamDefaultReader<R = any> {\n  /** @internal */\n  _ownerReadableStream!: ReadableStream<R>;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readRequests: SimpleQueue<ReadRequest<R>>;\n\n  constructor(stream: ReadableStream<R>) {\n    assertRequiredArgument(stream, 1, 'ReadableStreamDefaultReader');\n    assertReadableStream(stream, 'First parameter');\n\n    if (IsReadableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n    }\n\n    ReadableStreamReaderGenericInitialize(this, stream);\n\n    this._readRequests = new SimpleQueue();\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed,\n   * or rejected if the stream ever errors or the reader's lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('cancel'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('cancel'));\n    }\n\n    return ReadableStreamReaderGenericCancel(this, reason);\n  }\n\n  /**\n   * Returns a promise that allows access to the next chunk from the stream's internal queue, if available.\n   *\n   * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.\n   */\n  read(): Promise<ReadableStreamDefaultReadResult<R>> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('read'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('read from'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamDefaultReadResult<R>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamDefaultReadResult<R>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),\n      _closeSteps: () => resolvePromise({ value: undefined, done: true }),\n      _errorSteps: e => rejectPromise(e)\n    };\n    ReadableStreamDefaultReaderRead(this, readRequest);\n    return promise;\n  }\n\n  /**\n   * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.\n   * If the associated stream is errored when the lock is released, the reader will appear errored in the same way\n   * from now on; otherwise, the reader will appear closed.\n   *\n   * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by\n   * the reader's {@link ReadableStreamDefaultReader.read | read()} method has not yet been settled. Attempting to\n   * do so will throw a `TypeError` and leave the reader locked to the stream.\n   */\n  releaseLock(): void {\n    if (!IsReadableStreamDefaultReader(this)) {\n      throw defaultReaderBrandCheckException('releaseLock');\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return;\n    }\n\n    if (this._readRequests.length > 0) {\n      throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n    }\n\n    ReadableStreamReaderGenericRelease(this);\n  }\n}\n\nObject.defineProperties(ReadableStreamDefaultReader.prototype, {\n  cancel: { enumerable: true },\n  read: { enumerable: true },\n  releaseLock: { enumerable: true },\n  closed: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamDefaultReader.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamDefaultReader',\n    configurable: true\n  });\n}\n\n// Abstract operations for the readers.\n\nexport function IsReadableStreamDefaultReader<R = any>(x: any): x is ReadableStreamDefaultReader<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readRequests')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamDefaultReader;\n}\n\nexport function ReadableStreamDefaultReaderRead<R>(reader: ReadableStreamDefaultReader<R>,\n                                                   readRequest: ReadRequest<R>): void {\n  const stream = reader._ownerReadableStream;\n\n  assert(stream !== undefined);\n\n  stream._disturbed = true;\n\n  if (stream._state === 'closed') {\n    readRequest._closeSteps();\n  } else if (stream._state === 'errored') {\n    readRequest._errorSteps(stream._storedError);\n  } else {\n    assert(stream._state === 'readable');\n    stream._readableStreamController[PullSteps](readRequest as ReadRequest<any>);\n  }\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nfunction defaultReaderBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamDefaultReader.prototype.${name} can only be used on a ReadableStreamDefaultReader`);\n}\n","/// <reference lib=\"es2018.asynciterable\" />\n\nexport let AsyncIteratorPrototype: AsyncIterable<any> | undefined;\n\nif (typeof Symbol.asyncIterator === 'symbol') {\n  // We're running inside a ES2018+ environment, but we're compiling to an older syntax.\n  // We cannot access %AsyncIteratorPrototype% without non-ES2018 syntax, but we can re-create it.\n  AsyncIteratorPrototype = {\n    // 25.1.3.1 %AsyncIteratorPrototype% [ @@asyncIterator ] ( )\n    // https://tc39.github.io/ecma262/#sec-asynciteratorprototype-asynciterator\n    [Symbol.asyncIterator](this: AsyncIterator<any>) {\n      return this;\n    }\n  };\n  Object.defineProperty(AsyncIteratorPrototype, Symbol.asyncIterator, { enumerable: false });\n}\n","/// <reference lib=\"es2018.asynciterable\" />\n\nimport { ReadableStream } from '../readable-stream';\nimport {\n  AcquireReadableStreamDefaultReader,\n  ReadableStreamDefaultReader,\n  ReadableStreamDefaultReaderRead,\n  ReadableStreamDefaultReadResult,\n  ReadRequest\n} from './default-reader';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport assert from '../../stub/assert';\nimport { AsyncIteratorPrototype } from '@@target/stub/async-iterator-prototype';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport {\n  newPromise,\n  promiseRejectedWith,\n  promiseResolvedWith,\n  queueMicrotask,\n  transformPromiseWith\n} from '../helpers/webidl';\n\n/**\n * An async iterator returned by {@link ReadableStream.values}.\n *\n * @public\n */\nexport interface ReadableStreamAsyncIterator<R> extends AsyncIterator<R> {\n  next(): Promise<IteratorResult<R, undefined>>;\n\n  return(value?: any): Promise<IteratorResult<any>>;\n}\n\nexport class ReadableStreamAsyncIteratorImpl<R> {\n  private readonly _reader: ReadableStreamDefaultReader<R>;\n  private readonly _preventCancel: boolean;\n  private _ongoingPromise: Promise<ReadableStreamDefaultReadResult<R>> | undefined = undefined;\n  private _isFinished = false;\n\n  constructor(reader: ReadableStreamDefaultReader<R>, preventCancel: boolean) {\n    this._reader = reader;\n    this._preventCancel = preventCancel;\n  }\n\n  next(): Promise<ReadableStreamDefaultReadResult<R>> {\n    const nextSteps = () => this._nextSteps();\n    this._ongoingPromise = this._ongoingPromise ?\n      transformPromiseWith(this._ongoingPromise, nextSteps, nextSteps) :\n      nextSteps();\n    return this._ongoingPromise;\n  }\n\n  return(value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    const returnSteps = () => this._returnSteps(value);\n    return this._ongoingPromise ?\n      transformPromiseWith(this._ongoingPromise, returnSteps, returnSteps) :\n      returnSteps();\n  }\n\n  private _nextSteps(): Promise<ReadableStreamDefaultReadResult<R>> {\n    if (this._isFinished) {\n      return Promise.resolve({ value: undefined, done: true });\n    }\n\n    const reader = this._reader;\n    if (reader._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('iterate'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamDefaultReadResult<R>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamDefaultReadResult<R>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => {\n        this._ongoingPromise = undefined;\n        // This needs to be delayed by one microtask, otherwise we stop pulling too early which breaks a test.\n        // FIXME Is this a bug in the specification, or in the test?\n        queueMicrotask(() => resolvePromise({ value: chunk, done: false }));\n      },\n      _closeSteps: () => {\n        this._ongoingPromise = undefined;\n        this._isFinished = true;\n        ReadableStreamReaderGenericRelease(reader);\n        resolvePromise({ value: undefined, done: true });\n      },\n      _errorSteps: reason => {\n        this._ongoingPromise = undefined;\n        this._isFinished = true;\n        ReadableStreamReaderGenericRelease(reader);\n        rejectPromise(reason);\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n    return promise;\n  }\n\n  private _returnSteps(value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (this._isFinished) {\n      return Promise.resolve({ value, done: true });\n    }\n    this._isFinished = true;\n\n    const reader = this._reader;\n    if (reader._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('finish iterating'));\n    }\n\n    assert(reader._readRequests.length === 0);\n\n    if (!this._preventCancel) {\n      const result = ReadableStreamReaderGenericCancel(reader, value);\n      ReadableStreamReaderGenericRelease(reader);\n      return transformPromiseWith(result, () => ({ value, done: true }));\n    }\n\n    ReadableStreamReaderGenericRelease(reader);\n    return promiseResolvedWith({ value, done: true });\n  }\n}\n\ndeclare class ReadableStreamAsyncIteratorInstance<R> implements ReadableStreamAsyncIterator<R> {\n  /** @interal */\n  _asyncIteratorImpl: ReadableStreamAsyncIteratorImpl<R>;\n\n  next(): Promise<IteratorResult<R, undefined>>;\n\n  return(value?: any): Promise<IteratorResult<any>>;\n}\n\nconst ReadableStreamAsyncIteratorPrototype: ReadableStreamAsyncIteratorInstance<any> = {\n  next(this: ReadableStreamAsyncIteratorInstance<any>): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (!IsReadableStreamAsyncIterator(this)) {\n      return promiseRejectedWith(streamAsyncIteratorBrandCheckException('next'));\n    }\n    return this._asyncIteratorImpl.next();\n  },\n\n  return(this: ReadableStreamAsyncIteratorInstance<any>, value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (!IsReadableStreamAsyncIterator(this)) {\n      return promiseRejectedWith(streamAsyncIteratorBrandCheckException('return'));\n    }\n    return this._asyncIteratorImpl.return(value);\n  }\n} as any;\nif (AsyncIteratorPrototype !== undefined) {\n  Object.setPrototypeOf(ReadableStreamAsyncIteratorPrototype, AsyncIteratorPrototype);\n}\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamAsyncIterator<R>(stream: ReadableStream<R>,\n                                                      preventCancel: boolean): ReadableStreamAsyncIterator<R> {\n  const reader = AcquireReadableStreamDefaultReader<R>(stream);\n  const impl = new ReadableStreamAsyncIteratorImpl(reader, preventCancel);\n  const iterator: ReadableStreamAsyncIteratorInstance<R> = Object.create(ReadableStreamAsyncIteratorPrototype);\n  iterator._asyncIteratorImpl = impl;\n  return iterator;\n}\n\nfunction IsReadableStreamAsyncIterator<R = any>(x: any): x is ReadableStreamAsyncIterator<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_asyncIteratorImpl')) {\n    return false;\n  }\n\n  try {\n    // noinspection SuspiciousTypeOfGuard\n    return (x as ReadableStreamAsyncIteratorInstance<any>)._asyncIteratorImpl instanceof\n      ReadableStreamAsyncIteratorImpl;\n  } catch {\n    return false;\n  }\n}\n\n// Helper functions for the ReadableStream.\n\nfunction streamAsyncIteratorBrandCheckException(name: string): TypeError {\n  return new TypeError(`ReadableStreamAsyncIterator.${name} can only be used on a ReadableSteamAsyncIterator`);\n}\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Polyfill\nconst NumberIsNaN: typeof Number.isNaN = Number.isNaN || function (x) {\n  // eslint-disable-next-line no-self-compare\n  return x !== x;\n};\n\nexport default NumberIsNaN;\n","export function CreateArrayFromList<T extends any[]>(elements: T): T {\n  // We use arrays to represent lists, so this is basically a no-op.\n  // Do a slice though just in case we happen to depend on the unique-ness.\n  return elements.slice() as T;\n}\n\nexport function CopyDataBlockBytes(dest: ArrayBuffer,\n                                   destOffset: number,\n                                   src: ArrayBuffer,\n                                   srcOffset: number,\n                                   n: number) {\n  new Uint8Array(dest).set(new Uint8Array(src, srcOffset, n), destOffset);\n}\n\n// Not implemented correctly\nexport function TransferArrayBuffer<T extends ArrayBufferLike>(O: T): T {\n  return O;\n}\n\n// Not implemented correctly\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nexport function CanTransferArrayBuffer(O: ArrayBufferLike): boolean {\n  return true;\n}\n\n// Not implemented correctly\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nexport function IsDetachedBuffer(O: ArrayBufferLike): boolean {\n  return false;\n}\n\nexport function ArrayBufferSlice(buffer: ArrayBufferLike, begin: number, end: number): ArrayBufferLike {\n  // ArrayBuffer.prototype.slice is not available on IE10\n  // https://www.caniuse.com/mdn-javascript_builtins_arraybuffer_slice\n  if (buffer.slice) {\n    return buffer.slice(begin, end);\n  }\n  const length = end - begin;\n  const slice = new ArrayBuffer(length);\n  CopyDataBlockBytes(slice, 0, buffer, begin, length);\n  return slice;\n}\n","import NumberIsNaN from '../../stub/number-isnan';\nimport { ArrayBufferSlice } from './ecmascript';\n\nexport function IsNonNegativeNumber(v: number): boolean {\n  if (typeof v !== 'number') {\n    return false;\n  }\n\n  if (NumberIsNaN(v)) {\n    return false;\n  }\n\n  if (v < 0) {\n    return false;\n  }\n\n  return true;\n}\n\nexport function CloneAsUint8Array(O: ArrayBufferView): Uint8Array {\n  const buffer = ArrayBufferSlice(O.buffer, O.byteOffset, O.byteOffset + O.byteLength);\n  return new Uint8Array(buffer);\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport { IsNonNegativeNumber } from './miscellaneous';\n\nexport interface QueueContainer<T> {\n  _queue: SimpleQueue<T>;\n  _queueTotalSize: number;\n}\n\nexport interface QueuePair<T> {\n  value: T;\n  size: number;\n}\n\nexport function DequeueValue<T>(container: QueueContainer<QueuePair<T>>): T {\n  assert('_queue' in container && '_queueTotalSize' in container);\n  assert(container._queue.length > 0);\n\n  const pair = container._queue.shift()!;\n  container._queueTotalSize -= pair.size;\n  if (container._queueTotalSize < 0) {\n    container._queueTotalSize = 0;\n  }\n\n  return pair.value;\n}\n\nexport function EnqueueValueWithSize<T>(container: QueueContainer<QueuePair<T>>, value: T, size: number) {\n  assert('_queue' in container && '_queueTotalSize' in container);\n\n  if (!IsNonNegativeNumber(size) || size === Infinity) {\n    throw new RangeError('Size must be a finite, non-NaN, non-negative number.');\n  }\n\n  container._queue.push({ value, size });\n  container._queueTotalSize += size;\n}\n\nexport function PeekQueueValue<T>(container: QueueContainer<QueuePair<T>>): T {\n  assert('_queue' in container && '_queueTotalSize' in container);\n  assert(container._queue.length > 0);\n\n  const pair = container._queue.peek();\n  return pair.value;\n}\n\nexport function ResetQueue<T>(container: QueueContainer<T>) {\n  assert('_queue' in container && '_queueTotalSize' in container);\n\n  container._queue = new SimpleQueue<T>();\n  container._queueTotalSize = 0;\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport { ResetQueue } from '../abstract-ops/queue-with-sizes';\nimport {\n  ReadableStreamAddReadRequest,\n  ReadableStreamFulfillReadRequest,\n  ReadableStreamGetNumReadRequests,\n  ReadableStreamHasDefaultReader,\n  ReadRequest\n} from './default-reader';\nimport {\n  ReadableStreamAddReadIntoRequest,\n  ReadableStreamFulfillReadIntoRequest,\n  ReadableStreamGetNumReadIntoRequests,\n  ReadableStreamHasBYOBReader,\n  ReadIntoRequest\n} from './byob-reader';\nimport NumberIsInteger from '../../stub/number-isinteger';\nimport {\n  IsReadableStreamLocked,\n  ReadableByteStream,\n  ReadableStreamClose,\n  ReadableStreamError\n} from '../readable-stream';\nimport { ValidatedUnderlyingByteSource } from './underlying-source';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport {\n  ArrayBufferSlice,\n  CanTransferArrayBuffer,\n  CopyDataBlockBytes,\n  IsDetachedBuffer,\n  TransferArrayBuffer\n} from '../abstract-ops/ecmascript';\nimport { CancelSteps, PullSteps } from '../abstract-ops/internal-methods';\nimport { promiseResolvedWith, uponPromise } from '../helpers/webidl';\nimport { assertRequiredArgument, convertUnsignedLongLongWithEnforceRange } from '../validators/basic';\n\n/**\n * A pull-into request in a {@link ReadableByteStreamController}.\n *\n * @public\n */\nexport class ReadableStreamBYOBRequest {\n  /** @internal */\n  _associatedReadableByteStreamController!: ReadableByteStreamController;\n  /** @internal */\n  _view!: ArrayBufferView | null;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the view for writing in to, or `null` if the BYOB request has already been responded to.\n   */\n  get view(): ArrayBufferView | null {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('view');\n    }\n\n    return this._view;\n  }\n\n  /**\n   * Indicates to the associated readable byte stream that `bytesWritten` bytes were written into\n   * {@link ReadableStreamBYOBRequest.view | view}, causing the result be surfaced to the consumer.\n   *\n   * After this method is called, {@link ReadableStreamBYOBRequest.view | view} will be transferred and no longer\n   * modifiable.\n   */\n  respond(bytesWritten: number): void;\n  respond(bytesWritten: number | undefined): void {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('respond');\n    }\n    assertRequiredArgument(bytesWritten, 1, 'respond');\n    bytesWritten = convertUnsignedLongLongWithEnforceRange(bytesWritten, 'First parameter');\n\n    if (this._associatedReadableByteStreamController === undefined) {\n      throw new TypeError('This BYOB request has been invalidated');\n    }\n\n    if (IsDetachedBuffer(this._view!.buffer)) {\n      throw new TypeError(`The BYOB request's buffer has been detached and so cannot be used as a response`);\n    }\n\n    assert(this._view!.byteLength > 0);\n    assert(this._view!.buffer.byteLength > 0);\n\n    ReadableByteStreamControllerRespond(this._associatedReadableByteStreamController, bytesWritten);\n  }\n\n  /**\n   * Indicates to the associated readable byte stream that instead of writing into\n   * {@link ReadableStreamBYOBRequest.view | view}, the underlying byte source is providing a new `ArrayBufferView`,\n   * which will be given to the consumer of the readable byte stream.\n   *\n   * After this method is called, `view` will be transferred and no longer modifiable.\n   */\n  respondWithNewView(view: ArrayBufferView): void;\n  respondWithNewView(view: ArrayBufferView | undefined): void {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('respondWithNewView');\n    }\n    assertRequiredArgument(view, 1, 'respondWithNewView');\n\n    if (!ArrayBuffer.isView(view)) {\n      throw new TypeError('You can only respond with array buffer views');\n    }\n\n    if (this._associatedReadableByteStreamController === undefined) {\n      throw new TypeError('This BYOB request has been invalidated');\n    }\n\n    if (IsDetachedBuffer(view.buffer)) {\n      throw new TypeError('The given view\\'s buffer has been detached and so cannot be used as a response');\n    }\n\n    ReadableByteStreamControllerRespondWithNewView(this._associatedReadableByteStreamController, view);\n  }\n}\n\nObject.defineProperties(ReadableStreamBYOBRequest.prototype, {\n  respond: { enumerable: true },\n  respondWithNewView: { enumerable: true },\n  view: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamBYOBRequest.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamBYOBRequest',\n    configurable: true\n  });\n}\n\ninterface ArrayBufferViewConstructor<T extends ArrayBufferView = ArrayBufferView> {\n  new(buffer: ArrayBufferLike, byteOffset: number, length?: number): T;\n\n  readonly prototype: T;\n  readonly BYTES_PER_ELEMENT: number;\n}\n\ninterface ByteQueueElement {\n  buffer: ArrayBufferLike;\n  byteOffset: number;\n  byteLength: number;\n}\n\ntype PullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> =\n  DefaultPullIntoDescriptor\n  | BYOBPullIntoDescriptor<T>;\n\ninterface DefaultPullIntoDescriptor {\n  buffer: ArrayBufferLike;\n  bufferByteLength: number;\n  byteOffset: number;\n  byteLength: number;\n  bytesFilled: number;\n  elementSize: number;\n  viewConstructor: ArrayBufferViewConstructor<Uint8Array>;\n  readerType: 'default';\n}\n\ninterface BYOBPullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> {\n  buffer: ArrayBufferLike;\n  bufferByteLength: number;\n  byteOffset: number;\n  byteLength: number;\n  bytesFilled: number;\n  elementSize: number;\n  viewConstructor: ArrayBufferViewConstructor<T>;\n  readerType: 'byob';\n}\n\n/**\n * Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue.\n *\n * @public\n */\nexport class ReadableByteStreamController {\n  /** @internal */\n  _controlledReadableByteStream!: ReadableByteStream;\n  /** @internal */\n  _queue!: SimpleQueue<ByteQueueElement>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _closeRequested!: boolean;\n  /** @internal */\n  _pullAgain!: boolean;\n  /** @internal */\n  _pulling !: boolean;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _pullAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _cancelAlgorithm!: (reason: any) => Promise<void>;\n  /** @internal */\n  _autoAllocateChunkSize: number | undefined;\n  /** @internal */\n  _byobRequest: ReadableStreamBYOBRequest | null;\n  /** @internal */\n  _pendingPullIntos!: SimpleQueue<PullIntoDescriptor>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the current BYOB pull request, or `null` if there isn't one.\n   */\n  get byobRequest(): ReadableStreamBYOBRequest | null {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('byobRequest');\n    }\n\n    return ReadableByteStreamControllerGetBYOBRequest(this);\n  }\n\n  /**\n   * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is\n   * over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure.\n   */\n  get desiredSize(): number | null {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('desiredSize');\n    }\n\n    return ReadableByteStreamControllerGetDesiredSize(this);\n  }\n\n  /**\n   * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from\n   * the stream, but once those are read, the stream will become closed.\n   */\n  close(): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('close');\n    }\n\n    if (this._closeRequested) {\n      throw new TypeError('The stream has already been closed; do not close it again!');\n    }\n\n    const state = this._controlledReadableByteStream._state;\n    if (state !== 'readable') {\n      throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be closed`);\n    }\n\n    ReadableByteStreamControllerClose(this);\n  }\n\n  /**\n   * Enqueues the given chunk chunk in the controlled readable stream.\n   * The chunk has to be an `ArrayBufferView` instance, or else a `TypeError` will be thrown.\n   */\n  enqueue(chunk: ArrayBufferView): void;\n  enqueue(chunk: ArrayBufferView | undefined): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('enqueue');\n    }\n\n    assertRequiredArgument(chunk, 1, 'enqueue');\n    if (!ArrayBuffer.isView(chunk)) {\n      throw new TypeError('chunk must be an array buffer view');\n    }\n    if (chunk.byteLength === 0) {\n      throw new TypeError('chunk must have non-zero byteLength');\n    }\n    if (chunk.buffer.byteLength === 0) {\n      throw new TypeError(`chunk's buffer must have non-zero byteLength`);\n    }\n\n    if (this._closeRequested) {\n      throw new TypeError('stream is closed or draining');\n    }\n\n    const state = this._controlledReadableByteStream._state;\n    if (state !== 'readable') {\n      throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be enqueued to`);\n    }\n\n    ReadableByteStreamControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.\n   */\n  error(e: any = undefined): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('error');\n    }\n\n    ReadableByteStreamControllerError(this, e);\n  }\n\n  /** @internal */\n  [CancelSteps](reason: any): Promise<void> {\n    ReadableByteStreamControllerClearPendingPullIntos(this);\n\n    ResetQueue(this);\n\n    const result = this._cancelAlgorithm(reason);\n    ReadableByteStreamControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [PullSteps](readRequest: ReadRequest<Uint8Array>): void {\n    const stream = this._controlledReadableByteStream;\n    assert(ReadableStreamHasDefaultReader(stream));\n\n    if (this._queueTotalSize > 0) {\n      assert(ReadableStreamGetNumReadRequests(stream) === 0);\n\n      const entry = this._queue.shift()!;\n      this._queueTotalSize -= entry.byteLength;\n\n      ReadableByteStreamControllerHandleQueueDrain(this);\n\n      const view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);\n\n      readRequest._chunkSteps(view);\n      return;\n    }\n\n    const autoAllocateChunkSize = this._autoAllocateChunkSize;\n    if (autoAllocateChunkSize !== undefined) {\n      let buffer: ArrayBuffer;\n      try {\n        buffer = new ArrayBuffer(autoAllocateChunkSize);\n      } catch (bufferE) {\n        readRequest._errorSteps(bufferE);\n        return;\n      }\n\n      const pullIntoDescriptor: DefaultPullIntoDescriptor = {\n        buffer,\n        bufferByteLength: autoAllocateChunkSize,\n        byteOffset: 0,\n        byteLength: autoAllocateChunkSize,\n        bytesFilled: 0,\n        elementSize: 1,\n        viewConstructor: Uint8Array,\n        readerType: 'default'\n      };\n\n      this._pendingPullIntos.push(pullIntoDescriptor);\n    }\n\n    ReadableStreamAddReadRequest(stream, readRequest);\n    ReadableByteStreamControllerCallPullIfNeeded(this);\n  }\n}\n\nObject.defineProperties(ReadableByteStreamController.prototype, {\n  close: { enumerable: true },\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  byobRequest: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableByteStreamController.prototype, Symbol.toStringTag, {\n    value: 'ReadableByteStreamController',\n    configurable: true\n  });\n}\n\n// Abstract operations for the ReadableByteStreamController.\n\nexport function IsReadableByteStreamController(x: any): x is ReadableByteStreamController {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableByteStream')) {\n    return false;\n  }\n\n  return x instanceof ReadableByteStreamController;\n}\n\nfunction IsReadableStreamBYOBRequest(x: any): x is ReadableStreamBYOBRequest {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_associatedReadableByteStreamController')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamBYOBRequest;\n}\n\nfunction ReadableByteStreamControllerCallPullIfNeeded(controller: ReadableByteStreamController): void {\n  const shouldPull = ReadableByteStreamControllerShouldCallPull(controller);\n  if (!shouldPull) {\n    return;\n  }\n\n  if (controller._pulling) {\n    controller._pullAgain = true;\n    return;\n  }\n\n  assert(!controller._pullAgain);\n\n  controller._pulling = true;\n\n  // TODO: Test controller argument\n  const pullPromise = controller._pullAlgorithm();\n  uponPromise(\n    pullPromise,\n    () => {\n      controller._pulling = false;\n\n      if (controller._pullAgain) {\n        controller._pullAgain = false;\n        ReadableByteStreamControllerCallPullIfNeeded(controller);\n      }\n    },\n    e => {\n      ReadableByteStreamControllerError(controller, e);\n    }\n  );\n}\n\nfunction ReadableByteStreamControllerClearPendingPullIntos(controller: ReadableByteStreamController) {\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n  controller._pendingPullIntos = new SimpleQueue();\n}\n\nfunction ReadableByteStreamControllerCommitPullIntoDescriptor<T extends ArrayBufferView>(\n  stream: ReadableByteStream,\n  pullIntoDescriptor: PullIntoDescriptor<T>\n) {\n  assert(stream._state !== 'errored');\n\n  let done = false;\n  if (stream._state === 'closed') {\n    assert(pullIntoDescriptor.bytesFilled === 0);\n    done = true;\n  }\n\n  const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);\n  if (pullIntoDescriptor.readerType === 'default') {\n    ReadableStreamFulfillReadRequest(stream, filledView as unknown as Uint8Array, done);\n  } else {\n    assert(pullIntoDescriptor.readerType === 'byob');\n    ReadableStreamFulfillReadIntoRequest(stream, filledView, done);\n  }\n}\n\nfunction ReadableByteStreamControllerConvertPullIntoDescriptor<T extends ArrayBufferView>(\n  pullIntoDescriptor: PullIntoDescriptor<T>\n): T {\n  const bytesFilled = pullIntoDescriptor.bytesFilled;\n  const elementSize = pullIntoDescriptor.elementSize;\n\n  assert(bytesFilled <= pullIntoDescriptor.byteLength);\n  assert(bytesFilled % elementSize === 0);\n\n  return new pullIntoDescriptor.viewConstructor(\n    pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize) as T;\n}\n\nfunction ReadableByteStreamControllerEnqueueChunkToQueue(controller: ReadableByteStreamController,\n                                                         buffer: ArrayBufferLike,\n                                                         byteOffset: number,\n                                                         byteLength: number) {\n  controller._queue.push({ buffer, byteOffset, byteLength });\n  controller._queueTotalSize += byteLength;\n}\n\nfunction ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller: ReadableByteStreamController,\n                                                                     pullIntoDescriptor: PullIntoDescriptor) {\n  const elementSize = pullIntoDescriptor.elementSize;\n\n  const currentAlignedBytes = pullIntoDescriptor.bytesFilled - pullIntoDescriptor.bytesFilled % elementSize;\n\n  const maxBytesToCopy = Math.min(controller._queueTotalSize,\n                                  pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled);\n  const maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;\n  const maxAlignedBytes = maxBytesFilled - maxBytesFilled % elementSize;\n\n  let totalBytesToCopyRemaining = maxBytesToCopy;\n  let ready = false;\n  if (maxAlignedBytes > currentAlignedBytes) {\n    totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled;\n    ready = true;\n  }\n\n  const queue = controller._queue;\n\n  while (totalBytesToCopyRemaining > 0) {\n    const headOfQueue = queue.peek();\n\n    const bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength);\n\n    const destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n    CopyDataBlockBytes(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy);\n\n    if (headOfQueue.byteLength === bytesToCopy) {\n      queue.shift();\n    } else {\n      headOfQueue.byteOffset += bytesToCopy;\n      headOfQueue.byteLength -= bytesToCopy;\n    }\n    controller._queueTotalSize -= bytesToCopy;\n\n    ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor);\n\n    totalBytesToCopyRemaining -= bytesToCopy;\n  }\n\n  if (!ready) {\n    assert(controller._queueTotalSize === 0);\n    assert(pullIntoDescriptor.bytesFilled > 0);\n    assert(pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize);\n  }\n\n  return ready;\n}\n\nfunction ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller: ReadableByteStreamController,\n                                                                size: number,\n                                                                pullIntoDescriptor: PullIntoDescriptor) {\n  assert(controller._pendingPullIntos.length === 0 || controller._pendingPullIntos.peek() === pullIntoDescriptor);\n  assert(controller._byobRequest === null);\n  pullIntoDescriptor.bytesFilled += size;\n}\n\nfunction ReadableByteStreamControllerHandleQueueDrain(controller: ReadableByteStreamController) {\n  assert(controller._controlledReadableByteStream._state === 'readable');\n\n  if (controller._queueTotalSize === 0 && controller._closeRequested) {\n    ReadableByteStreamControllerClearAlgorithms(controller);\n    ReadableStreamClose(controller._controlledReadableByteStream);\n  } else {\n    ReadableByteStreamControllerCallPullIfNeeded(controller);\n  }\n}\n\nfunction ReadableByteStreamControllerInvalidateBYOBRequest(controller: ReadableByteStreamController) {\n  if (controller._byobRequest === null) {\n    return;\n  }\n\n  controller._byobRequest._associatedReadableByteStreamController = undefined!;\n  controller._byobRequest._view = null!;\n  controller._byobRequest = null;\n}\n\nfunction ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller: ReadableByteStreamController) {\n  assert(!controller._closeRequested);\n\n  while (controller._pendingPullIntos.length > 0) {\n    if (controller._queueTotalSize === 0) {\n      return;\n    }\n\n    const pullIntoDescriptor = controller._pendingPullIntos.peek();\n\n    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {\n      ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n      ReadableByteStreamControllerCommitPullIntoDescriptor(\n        controller._controlledReadableByteStream,\n        pullIntoDescriptor\n      );\n    }\n  }\n}\n\nexport function ReadableByteStreamControllerPullInto<T extends ArrayBufferView>(\n  controller: ReadableByteStreamController,\n  view: T,\n  readIntoRequest: ReadIntoRequest<T>\n): void {\n  const stream = controller._controlledReadableByteStream;\n\n  let elementSize = 1;\n  if (view.constructor !== DataView) {\n    elementSize = (view.constructor as ArrayBufferViewConstructor<T>).BYTES_PER_ELEMENT;\n  }\n\n  const ctor = view.constructor as ArrayBufferViewConstructor<T>;\n\n  // try {\n  const buffer = TransferArrayBuffer(view.buffer);\n  // } catch (e) {\n  //   readIntoRequest._errorSteps(e);\n  //   return;\n  // }\n\n  const pullIntoDescriptor: BYOBPullIntoDescriptor<T> = {\n    buffer,\n    bufferByteLength: buffer.byteLength,\n    byteOffset: view.byteOffset,\n    byteLength: view.byteLength,\n    bytesFilled: 0,\n    elementSize,\n    viewConstructor: ctor,\n    readerType: 'byob'\n  };\n\n  if (controller._pendingPullIntos.length > 0) {\n    controller._pendingPullIntos.push(pullIntoDescriptor);\n\n    // No ReadableByteStreamControllerCallPullIfNeeded() call since:\n    // - No change happens on desiredSize\n    // - The source has already been notified of that there's at least 1 pending read(view)\n\n    ReadableStreamAddReadIntoRequest(stream, readIntoRequest);\n    return;\n  }\n\n  if (stream._state === 'closed') {\n    const emptyView = new ctor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0);\n    readIntoRequest._closeSteps(emptyView);\n    return;\n  }\n\n  if (controller._queueTotalSize > 0) {\n    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {\n      const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);\n\n      ReadableByteStreamControllerHandleQueueDrain(controller);\n\n      readIntoRequest._chunkSteps(filledView);\n      return;\n    }\n\n    if (controller._closeRequested) {\n      const e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n      ReadableByteStreamControllerError(controller, e);\n\n      readIntoRequest._errorSteps(e);\n      return;\n    }\n  }\n\n  controller._pendingPullIntos.push(pullIntoDescriptor);\n\n  ReadableStreamAddReadIntoRequest<T>(stream, readIntoRequest);\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nfunction ReadableByteStreamControllerRespondInClosedState(controller: ReadableByteStreamController,\n                                                          firstDescriptor: PullIntoDescriptor) {\n  assert(firstDescriptor.bytesFilled === 0);\n\n  const stream = controller._controlledReadableByteStream;\n  if (ReadableStreamHasBYOBReader(stream)) {\n    while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n      const pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);\n      ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);\n    }\n  }\n}\n\nfunction ReadableByteStreamControllerRespondInReadableState(controller: ReadableByteStreamController,\n                                                            bytesWritten: number,\n                                                            pullIntoDescriptor: PullIntoDescriptor) {\n  assert(pullIntoDescriptor.bytesFilled + bytesWritten <= pullIntoDescriptor.byteLength);\n\n  ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor);\n\n  if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {\n    return;\n  }\n\n  ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n  const remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize;\n  if (remainderSize > 0) {\n    const end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n    const remainder = ArrayBufferSlice(pullIntoDescriptor.buffer, end - remainderSize, end);\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength);\n  }\n\n  pullIntoDescriptor.bytesFilled -= remainderSize;\n  ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);\n\n  ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n}\n\nfunction ReadableByteStreamControllerRespondInternal(controller: ReadableByteStreamController, bytesWritten: number) {\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  assert(CanTransferArrayBuffer(firstDescriptor.buffer));\n\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n\n  const state = controller._controlledReadableByteStream._state;\n  if (state === 'closed') {\n    assert(bytesWritten === 0);\n    ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor);\n  } else {\n    assert(state === 'readable');\n    assert(bytesWritten > 0);\n    ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);\n  }\n\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nfunction ReadableByteStreamControllerShiftPendingPullInto(\n  controller: ReadableByteStreamController\n): PullIntoDescriptor {\n  assert(controller._byobRequest === null);\n  const descriptor = controller._pendingPullIntos.shift()!;\n  return descriptor;\n}\n\nfunction ReadableByteStreamControllerShouldCallPull(controller: ReadableByteStreamController): boolean {\n  const stream = controller._controlledReadableByteStream;\n\n  if (stream._state !== 'readable') {\n    return false;\n  }\n\n  if (controller._closeRequested) {\n    return false;\n  }\n\n  if (!controller._started) {\n    return false;\n  }\n\n  if (ReadableStreamHasDefaultReader(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    return true;\n  }\n\n  if (ReadableStreamHasBYOBReader(stream) && ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n    return true;\n  }\n\n  const desiredSize = ReadableByteStreamControllerGetDesiredSize(controller);\n  assert(desiredSize !== null);\n  if (desiredSize! > 0) {\n    return true;\n  }\n\n  return false;\n}\n\nfunction ReadableByteStreamControllerClearAlgorithms(controller: ReadableByteStreamController) {\n  controller._pullAlgorithm = undefined!;\n  controller._cancelAlgorithm = undefined!;\n}\n\n// A client of ReadableByteStreamController may use these functions directly to bypass state check.\n\nexport function ReadableByteStreamControllerClose(controller: ReadableByteStreamController) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (controller._closeRequested || stream._state !== 'readable') {\n    return;\n  }\n\n  if (controller._queueTotalSize > 0) {\n    controller._closeRequested = true;\n\n    return;\n  }\n\n  if (controller._pendingPullIntos.length > 0) {\n    const firstPendingPullInto = controller._pendingPullIntos.peek();\n    if (firstPendingPullInto.bytesFilled > 0) {\n      const e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n      ReadableByteStreamControllerError(controller, e);\n\n      throw e;\n    }\n  }\n\n  ReadableByteStreamControllerClearAlgorithms(controller);\n  ReadableStreamClose(stream);\n}\n\nexport function ReadableByteStreamControllerEnqueue(controller: ReadableByteStreamController, chunk: ArrayBufferView) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (controller._closeRequested || stream._state !== 'readable') {\n    return;\n  }\n\n  const buffer = chunk.buffer;\n  const byteOffset = chunk.byteOffset;\n  const byteLength = chunk.byteLength;\n  if (IsDetachedBuffer(buffer)) {\n    throw new TypeError('chunk\\'s buffer is detached and so cannot be enqueued');\n  }\n  const transferredBuffer = TransferArrayBuffer(buffer);\n\n  if (controller._pendingPullIntos.length > 0) {\n    const firstPendingPullInto = controller._pendingPullIntos.peek();\n    if (IsDetachedBuffer(firstPendingPullInto.buffer)) {\n      throw new TypeError(\n        'The BYOB request\\'s buffer has been detached and so cannot be filled with an enqueued chunk'\n      );\n    }\n    firstPendingPullInto.buffer = TransferArrayBuffer(firstPendingPullInto.buffer);\n  }\n\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n\n  if (ReadableStreamHasDefaultReader(stream)) {\n    if (ReadableStreamGetNumReadRequests(stream) === 0) {\n      assert(controller._pendingPullIntos.length === 0);\n      ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n    } else {\n      assert(controller._queue.length === 0);\n      if (controller._pendingPullIntos.length > 0) {\n        assert(controller._pendingPullIntos.peek().readerType === 'default');\n        ReadableByteStreamControllerShiftPendingPullInto(controller);\n      }\n      const transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength);\n      ReadableStreamFulfillReadRequest(stream, transferredView, false);\n    }\n  } else if (ReadableStreamHasBYOBReader(stream)) {\n    // TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully.\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n    ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n  } else {\n    assert(!IsReadableStreamLocked(stream));\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n  }\n\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nexport function ReadableByteStreamControllerError(controller: ReadableByteStreamController, e: any) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (stream._state !== 'readable') {\n    return;\n  }\n\n  ReadableByteStreamControllerClearPendingPullIntos(controller);\n\n  ResetQueue(controller);\n  ReadableByteStreamControllerClearAlgorithms(controller);\n  ReadableStreamError(stream, e);\n}\n\nexport function ReadableByteStreamControllerGetBYOBRequest(\n  controller: ReadableByteStreamController\n): ReadableStreamBYOBRequest | null {\n  if (controller._byobRequest === null && controller._pendingPullIntos.length > 0) {\n    const firstDescriptor = controller._pendingPullIntos.peek();\n    const view = new Uint8Array(firstDescriptor.buffer,\n                                firstDescriptor.byteOffset + firstDescriptor.bytesFilled,\n                                firstDescriptor.byteLength - firstDescriptor.bytesFilled);\n\n    const byobRequest: ReadableStreamBYOBRequest = Object.create(ReadableStreamBYOBRequest.prototype);\n    SetUpReadableStreamBYOBRequest(byobRequest, controller, view);\n    controller._byobRequest = byobRequest;\n  }\n  return controller._byobRequest;\n}\n\nfunction ReadableByteStreamControllerGetDesiredSize(controller: ReadableByteStreamController): number | null {\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'errored') {\n    return null;\n  }\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\nexport function ReadableByteStreamControllerRespond(controller: ReadableByteStreamController, bytesWritten: number) {\n  assert(controller._pendingPullIntos.length > 0);\n\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'closed') {\n    if (bytesWritten !== 0) {\n      throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream');\n    }\n  } else {\n    assert(state === 'readable');\n    if (bytesWritten === 0) {\n      throw new TypeError('bytesWritten must be greater than 0 when calling respond() on a readable stream');\n    }\n    if (firstDescriptor.bytesFilled + bytesWritten > firstDescriptor.byteLength) {\n      throw new RangeError('bytesWritten out of range');\n    }\n  }\n\n  firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer);\n\n  ReadableByteStreamControllerRespondInternal(controller, bytesWritten);\n}\n\nexport function ReadableByteStreamControllerRespondWithNewView(controller: ReadableByteStreamController,\n                                                               view: ArrayBufferView) {\n  assert(controller._pendingPullIntos.length > 0);\n  assert(!IsDetachedBuffer(view.buffer));\n\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'closed') {\n    if (view.byteLength !== 0) {\n      throw new TypeError('The view\\'s length must be 0 when calling respondWithNewView() on a closed stream');\n    }\n  } else {\n    assert(state === 'readable');\n    if (view.byteLength === 0) {\n      throw new TypeError(\n        'The view\\'s length must be greater than 0 when calling respondWithNewView() on a readable stream'\n      );\n    }\n  }\n\n  if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) {\n    throw new RangeError('The region specified by view does not match byobRequest');\n  }\n  if (firstDescriptor.bufferByteLength !== view.buffer.byteLength) {\n    throw new RangeError('The buffer of view has different capacity than byobRequest');\n  }\n  if (firstDescriptor.bytesFilled + view.byteLength > firstDescriptor.byteLength) {\n    throw new RangeError('The region specified by view is larger than byobRequest');\n  }\n\n  const viewByteLength = view.byteLength;\n  firstDescriptor.buffer = TransferArrayBuffer(view.buffer);\n  ReadableByteStreamControllerRespondInternal(controller, viewByteLength);\n}\n\nexport function SetUpReadableByteStreamController(stream: ReadableByteStream,\n                                                  controller: ReadableByteStreamController,\n                                                  startAlgorithm: () => void | PromiseLike<void>,\n                                                  pullAlgorithm: () => Promise<void>,\n                                                  cancelAlgorithm: (reason: any) => Promise<void>,\n                                                  highWaterMark: number,\n                                                  autoAllocateChunkSize: number | undefined) {\n  assert(stream._readableStreamController === undefined);\n  if (autoAllocateChunkSize !== undefined) {\n    assert(NumberIsInteger(autoAllocateChunkSize));\n    assert(autoAllocateChunkSize > 0);\n  }\n\n  controller._controlledReadableByteStream = stream;\n\n  controller._pullAgain = false;\n  controller._pulling = false;\n\n  controller._byobRequest = null;\n\n  // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n  controller._queue = controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._closeRequested = false;\n  controller._started = false;\n\n  controller._strategyHWM = highWaterMark;\n\n  controller._pullAlgorithm = pullAlgorithm;\n  controller._cancelAlgorithm = cancelAlgorithm;\n\n  controller._autoAllocateChunkSize = autoAllocateChunkSize;\n\n  controller._pendingPullIntos = new SimpleQueue();\n\n  stream._readableStreamController = controller;\n\n  const startResult = startAlgorithm();\n  uponPromise(\n    promiseResolvedWith(startResult),\n    () => {\n      controller._started = true;\n\n      assert(!controller._pulling);\n      assert(!controller._pullAgain);\n\n      ReadableByteStreamControllerCallPullIfNeeded(controller);\n    },\n    r => {\n      ReadableByteStreamControllerError(controller, r);\n    }\n  );\n}\n\nexport function SetUpReadableByteStreamControllerFromUnderlyingSource(\n  stream: ReadableByteStream,\n  underlyingByteSource: ValidatedUnderlyingByteSource,\n  highWaterMark: number\n) {\n  const controller: ReadableByteStreamController = Object.create(ReadableByteStreamController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let pullAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let cancelAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingByteSource.start !== undefined) {\n    startAlgorithm = () => underlyingByteSource.start!(controller);\n  }\n  if (underlyingByteSource.pull !== undefined) {\n    pullAlgorithm = () => underlyingByteSource.pull!(controller);\n  }\n  if (underlyingByteSource.cancel !== undefined) {\n    cancelAlgorithm = reason => underlyingByteSource.cancel!(reason);\n  }\n\n  const autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;\n  if (autoAllocateChunkSize === 0) {\n    throw new TypeError('autoAllocateChunkSize must be greater than 0');\n  }\n\n  SetUpReadableByteStreamController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize\n  );\n}\n\nfunction SetUpReadableStreamBYOBRequest(request: ReadableStreamBYOBRequest,\n                                        controller: ReadableByteStreamController,\n                                        view: ArrayBufferView) {\n  assert(IsReadableByteStreamController(controller));\n  assert(typeof view === 'object');\n  assert(ArrayBuffer.isView(view));\n  assert(!IsDetachedBuffer(view.buffer));\n  request._associatedReadableByteStreamController = controller;\n  request._view = view;\n}\n\n// Helper functions for the ReadableStreamBYOBRequest.\n\nfunction byobRequestBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamBYOBRequest.prototype.${name} can only be used on a ReadableStreamBYOBRequest`);\n}\n\n// Helper functions for the ReadableByteStreamController.\n\nfunction byteStreamControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableByteStreamController.prototype.${name} can only be used on a ReadableByteStreamController`);\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericInitialize,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport { IsReadableStreamLocked, ReadableByteStream, ReadableStream } from '../readable-stream';\nimport {\n  IsReadableByteStreamController,\n  ReadableByteStreamController,\n  ReadableByteStreamControllerPullInto\n} from './byte-stream-controller';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { newPromise, promiseRejectedWith } from '../helpers/webidl';\nimport { assertRequiredArgument } from '../validators/basic';\nimport { assertReadableStream } from '../validators/readable-stream';\nimport { IsDetachedBuffer } from '../abstract-ops/ecmascript';\n\n/**\n * A result returned by {@link ReadableStreamBYOBReader.read}.\n *\n * @public\n */\nexport type ReadableStreamBYOBReadResult<T extends ArrayBufferView> = {\n  done: false;\n  value: T;\n} | {\n  done: true;\n  value: T | undefined;\n};\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamBYOBReader(stream: ReadableByteStream): ReadableStreamBYOBReader {\n  return new ReadableStreamBYOBReader(stream);\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamAddReadIntoRequest<T extends ArrayBufferView>(stream: ReadableByteStream,\n                                                                            readIntoRequest: ReadIntoRequest<T>): void {\n  assert(IsReadableStreamBYOBReader(stream._reader));\n  assert(stream._state === 'readable' || stream._state === 'closed');\n\n  (stream._reader! as ReadableStreamBYOBReader)._readIntoRequests.push(readIntoRequest);\n}\n\nexport function ReadableStreamFulfillReadIntoRequest(stream: ReadableByteStream,\n                                                     chunk: ArrayBufferView,\n                                                     done: boolean) {\n  const reader = stream._reader as ReadableStreamBYOBReader;\n\n  assert(reader._readIntoRequests.length > 0);\n\n  const readIntoRequest = reader._readIntoRequests.shift()!;\n  if (done) {\n    readIntoRequest._closeSteps(chunk);\n  } else {\n    readIntoRequest._chunkSteps(chunk);\n  }\n}\n\nexport function ReadableStreamGetNumReadIntoRequests(stream: ReadableByteStream): number {\n  return (stream._reader as ReadableStreamBYOBReader)._readIntoRequests.length;\n}\n\nexport function ReadableStreamHasBYOBReader(stream: ReadableByteStream): boolean {\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return false;\n  }\n\n  if (!IsReadableStreamBYOBReader(reader)) {\n    return false;\n  }\n\n  return true;\n}\n\n// Readers\n\nexport interface ReadIntoRequest<T extends ArrayBufferView> {\n  _chunkSteps(chunk: T): void;\n\n  _closeSteps(chunk: T | undefined): void;\n\n  _errorSteps(e: any): void;\n}\n\n/**\n * A BYOB reader vended by a {@link ReadableStream}.\n *\n * @public\n */\nexport class ReadableStreamBYOBReader {\n  /** @internal */\n  _ownerReadableStream!: ReadableByteStream;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readIntoRequests: SimpleQueue<ReadIntoRequest<any>>;\n\n  constructor(stream: ReadableByteStream) {\n    assertRequiredArgument(stream, 1, 'ReadableStreamBYOBReader');\n    assertReadableStream(stream, 'First parameter');\n\n    if (IsReadableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n    }\n\n    if (!IsReadableByteStreamController(stream._readableStreamController)) {\n      throw new TypeError('Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte ' +\n        'source');\n    }\n\n    ReadableStreamReaderGenericInitialize(this, stream);\n\n    this._readIntoRequests = new SimpleQueue();\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or\n   * the reader's lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('cancel'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('cancel'));\n    }\n\n    return ReadableStreamReaderGenericCancel(this, reason);\n  }\n\n  /**\n   * Attempts to reads bytes into view, and returns a promise resolved with the result.\n   *\n   * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.\n   */\n  read<T extends ArrayBufferView>(view: T): Promise<ReadableStreamBYOBReadResult<T>> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('read'));\n    }\n\n    if (!ArrayBuffer.isView(view)) {\n      return promiseRejectedWith(new TypeError('view must be an array buffer view'));\n    }\n    if (view.byteLength === 0) {\n      return promiseRejectedWith(new TypeError('view must have non-zero byteLength'));\n    }\n    if (view.buffer.byteLength === 0) {\n      return promiseRejectedWith(new TypeError(`view's buffer must have non-zero byteLength`));\n    }\n    if (IsDetachedBuffer(view.buffer)) {\n      return promiseRejectedWith(new TypeError('view\\'s buffer has been detached'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('read from'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamBYOBReadResult<T>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamBYOBReadResult<T>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readIntoRequest: ReadIntoRequest<T> = {\n      _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),\n      _closeSteps: chunk => resolvePromise({ value: chunk, done: true }),\n      _errorSteps: e => rejectPromise(e)\n    };\n    ReadableStreamBYOBReaderRead(this, view, readIntoRequest);\n    return promise;\n  }\n\n  /**\n   * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.\n   * If the associated stream is errored when the lock is released, the reader will appear errored in the same way\n   * from now on; otherwise, the reader will appear closed.\n   *\n   * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by\n   * the reader's {@link ReadableStreamBYOBReader.read | read()} method has not yet been settled. Attempting to\n   * do so will throw a `TypeError` and leave the reader locked to the stream.\n   */\n  releaseLock(): void {\n    if (!IsReadableStreamBYOBReader(this)) {\n      throw byobReaderBrandCheckException('releaseLock');\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return;\n    }\n\n    if (this._readIntoRequests.length > 0) {\n      throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n    }\n\n    ReadableStreamReaderGenericRelease(this);\n  }\n}\n\nObject.defineProperties(ReadableStreamBYOBReader.prototype, {\n  cancel: { enumerable: true },\n  read: { enumerable: true },\n  releaseLock: { enumerable: true },\n  closed: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamBYOBReader.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamBYOBReader',\n    configurable: true\n  });\n}\n\n// Abstract operations for the readers.\n\nexport function IsReadableStreamBYOBReader(x: any): x is ReadableStreamBYOBReader {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readIntoRequests')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamBYOBReader;\n}\n\nexport function ReadableStreamBYOBReaderRead<T extends ArrayBufferView>(\n  reader: ReadableStreamBYOBReader,\n  view: T,\n  readIntoRequest: ReadIntoRequest<T>\n): void {\n  const stream = reader._ownerReadableStream;\n\n  assert(stream !== undefined);\n\n  stream._disturbed = true;\n\n  if (stream._state === 'errored') {\n    readIntoRequest._errorSteps(stream._storedError);\n  } else {\n    ReadableByteStreamControllerPullInto(\n      stream._readableStreamController as ReadableByteStreamController,\n      view,\n      readIntoRequest\n    );\n  }\n}\n\n// Helper functions for the ReadableStreamBYOBReader.\n\nfunction byobReaderBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamBYOBReader.prototype.${name} can only be used on a ReadableStreamBYOBReader`);\n}\n","import { QueuingStrategy, QueuingStrategySizeCallback } from '../queuing-strategy';\nimport NumberIsNaN from '../../stub/number-isnan';\n\nexport function ExtractHighWaterMark(strategy: QueuingStrategy, defaultHWM: number): number {\n  const { highWaterMark } = strategy;\n\n  if (highWaterMark === undefined) {\n    return defaultHWM;\n  }\n\n  if (NumberIsNaN(highWaterMark) || highWaterMark < 0) {\n    throw new RangeError('Invalid highWaterMark');\n  }\n\n  return highWaterMark;\n}\n\nexport function ExtractSizeAlgorithm<T>(strategy: QueuingStrategy<T>): QueuingStrategySizeCallback<T> {\n  const { size } = strategy;\n\n  if (!size) {\n    return () => 1;\n  }\n\n  return size;\n}\n","import { QueuingStrategy, QueuingStrategySizeCallback } from '../queuing-strategy';\nimport { assertDictionary, assertFunction, convertUnrestrictedDouble } from './basic';\n\nexport function convertQueuingStrategy<T>(init: QueuingStrategy<T> | null | undefined,\n                                          context: string): QueuingStrategy<T> {\n  assertDictionary(init, context);\n  const highWaterMark = init?.highWaterMark;\n  const size = init?.size;\n  return {\n    highWaterMark: highWaterMark === undefined ? undefined : convertUnrestrictedDouble(highWaterMark),\n    size: size === undefined ? undefined : convertQueuingStrategySize(size, `${context} has member 'size' that`)\n  };\n}\n\nfunction convertQueuingStrategySize<T>(fn: QueuingStrategySizeCallback<T>,\n                                       context: string): QueuingStrategySizeCallback<T> {\n  assertFunction(fn, context);\n  return chunk => convertUnrestrictedDouble(fn(chunk));\n}\n","import { assertDictionary, assertFunction } from './basic';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\nimport {\n  UnderlyingSink,\n  UnderlyingSinkAbortCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  ValidatedUnderlyingSink\n} from '../writable-stream/underlying-sink';\nimport { WritableStreamDefaultController } from '../writable-stream';\n\nexport function convertUnderlyingSink<W>(original: UnderlyingSink<W> | null,\n                                         context: string): ValidatedUnderlyingSink<W> {\n  assertDictionary(original, context);\n  const abort = original?.abort;\n  const close = original?.close;\n  const start = original?.start;\n  const type = original?.type;\n  const write = original?.write;\n  return {\n    abort: abort === undefined ?\n      undefined :\n      convertUnderlyingSinkAbortCallback(abort, original!, `${context} has member 'abort' that`),\n    close: close === undefined ?\n      undefined :\n      convertUnderlyingSinkCloseCallback(close, original!, `${context} has member 'close' that`),\n    start: start === undefined ?\n      undefined :\n      convertUnderlyingSinkStartCallback(start, original!, `${context} has member 'start' that`),\n    write: write === undefined ?\n      undefined :\n      convertUnderlyingSinkWriteCallback(write, original!, `${context} has member 'write' that`),\n    type\n  };\n}\n\nfunction convertUnderlyingSinkAbortCallback(\n  fn: UnderlyingSinkAbortCallback,\n  original: UnderlyingSink,\n  context: string\n): (reason: any) => Promise<void> {\n  assertFunction(fn, context);\n  return (reason: any) => promiseCall(fn, original, [reason]);\n}\n\nfunction convertUnderlyingSinkCloseCallback(\n  fn: UnderlyingSinkCloseCallback,\n  original: UnderlyingSink,\n  context: string\n): () => Promise<void> {\n  assertFunction(fn, context);\n  return () => promiseCall(fn, original, []);\n}\n\nfunction convertUnderlyingSinkStartCallback(\n  fn: UnderlyingSinkStartCallback,\n  original: UnderlyingSink,\n  context: string\n): UnderlyingSinkStartCallback {\n  assertFunction(fn, context);\n  return (controller: WritableStreamDefaultController) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertUnderlyingSinkWriteCallback<W>(\n  fn: UnderlyingSinkWriteCallback<W>,\n  original: UnderlyingSink<W>,\n  context: string\n): (chunk: W, controller: WritableStreamDefaultController) => Promise<void> {\n  assertFunction(fn, context);\n  return (chunk: W, controller: WritableStreamDefaultController) => promiseCall(fn, original, [chunk, controller]);\n}\n","import { IsWritableStream, WritableStream } from '../writable-stream';\n\nexport function assertWritableStream(x: unknown, context: string): asserts x is WritableStream {\n  if (!IsWritableStream(x)) {\n    throw new TypeError(`${context} is not a WritableStream.`);\n  }\n}\n","/**\n * A signal object that allows you to communicate with a request and abort it if required\n * via its associated `AbortController` object.\n *\n * @remarks\n *   This interface is compatible with the `AbortSignal` interface defined in TypeScript's DOM types.\n *   It is redefined here, so it can be polyfilled without a DOM, for example with\n *   {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.\n *\n * @public\n */\nexport interface AbortSignal {\n  /**\n   * Whether the request is aborted.\n   */\n  readonly aborted: boolean;\n\n  /**\n   * Add an event listener to be triggered when this signal becomes aborted.\n   */\n  addEventListener(type: 'abort', listener: () => void): void;\n\n  /**\n   * Remove an event listener that was previously added with {@link AbortSignal.addEventListener}.\n   */\n  removeEventListener(type: 'abort', listener: () => void): void;\n}\n\nexport function isAbortSignal(value: unknown): value is AbortSignal {\n  if (typeof value !== 'object' || value === null) {\n    return false;\n  }\n  try {\n    return typeof (value as AbortSignal).aborted === 'boolean';\n  } catch {\n    // AbortSignal.prototype.aborted throws if its brand check fails\n    return false;\n  }\n}\n\n/**\n * A controller object that allows you to abort an `AbortSignal` when desired.\n *\n * @remarks\n *   This interface is compatible with the `AbortController` interface defined in TypeScript's DOM types.\n *   It is redefined here, so it can be polyfilled without a DOM, for example with\n *   {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.\n *\n * @internal\n */\nexport interface AbortController {\n  readonly signal: AbortSignal;\n\n  abort(): void;\n}\n\ninterface AbortControllerConstructor {\n  new(): AbortController;\n}\n\nconst supportsAbortController = typeof (AbortController as any) === 'function';\n\n/**\n * Construct a new AbortController, if supported by the platform.\n *\n * @internal\n */\nexport function createAbortController(): AbortController | undefined {\n  if (supportsAbortController) {\n    return new (AbortController as AbortControllerConstructor)();\n  }\n  return undefined;\n}\n","import assert from '../stub/assert';\nimport {\n  newPromise,\n  promiseRejectedWith,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  uponPromise\n} from './helpers/webidl';\nimport {\n  DequeueValue,\n  EnqueueValueWithSize,\n  PeekQueueValue,\n  QueuePair,\n  ResetQueue\n} from './abstract-ops/queue-with-sizes';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { SimpleQueue } from './simple-queue';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { AbortSteps, ErrorSteps } from './abstract-ops/internal-methods';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport {\n  UnderlyingSink,\n  UnderlyingSinkAbortCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  ValidatedUnderlyingSink\n} from './writable-stream/underlying-sink';\nimport { assertObject, assertRequiredArgument } from './validators/basic';\nimport { convertUnderlyingSink } from './validators/underlying-sink';\nimport { assertWritableStream } from './validators/writable-stream';\nimport { AbortController, AbortSignal, createAbortController } from './abort-signal';\n\ntype WritableStreamState = 'writable' | 'closed' | 'erroring' | 'errored';\n\ninterface WriteOrCloseRequest {\n  _resolve: (value?: undefined) => void;\n  _reject: (reason: any) => void;\n}\n\ntype WriteRequest = WriteOrCloseRequest;\ntype CloseRequest = WriteOrCloseRequest;\n\ninterface PendingAbortRequest {\n  _promise: Promise<undefined>;\n  _resolve: (value?: undefined) => void;\n  _reject: (reason: any) => void;\n  _reason: any;\n  _wasAlreadyErroring: boolean;\n}\n\n/**\n * A writable stream represents a destination for data, into which you can write.\n *\n * @public\n */\nclass WritableStream<W = any> {\n  /** @internal */\n  _state!: WritableStreamState;\n  /** @internal */\n  _storedError: any;\n  /** @internal */\n  _writer: WritableStreamDefaultWriter<W> | undefined;\n  /** @internal */\n  _writableStreamController!: WritableStreamDefaultController<W>;\n  /** @internal */\n  _writeRequests!: SimpleQueue<WriteRequest>;\n  /** @internal */\n  _inFlightWriteRequest: WriteRequest | undefined;\n  /** @internal */\n  _closeRequest: CloseRequest | undefined;\n  /** @internal */\n  _inFlightCloseRequest: CloseRequest | undefined;\n  /** @internal */\n  _pendingAbortRequest: PendingAbortRequest | undefined;\n  /** @internal */\n  _backpressure!: boolean;\n\n  constructor(underlyingSink?: UnderlyingSink<W>, strategy?: QueuingStrategy<W>);\n  constructor(rawUnderlyingSink: UnderlyingSink<W> | null | undefined = {},\n              rawStrategy: QueuingStrategy<W> | null | undefined = {}) {\n    if (rawUnderlyingSink === undefined) {\n      rawUnderlyingSink = null;\n    } else {\n      assertObject(rawUnderlyingSink, 'First parameter');\n    }\n\n    const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');\n    const underlyingSink = convertUnderlyingSink(rawUnderlyingSink, 'First parameter');\n\n    InitializeWritableStream(this);\n\n    const type = underlyingSink.type;\n    if (type !== undefined) {\n      throw new RangeError('Invalid type is specified');\n    }\n\n    const sizeAlgorithm = ExtractSizeAlgorithm(strategy);\n    const highWaterMark = ExtractHighWaterMark(strategy, 1);\n\n    SetUpWritableStreamDefaultControllerFromUnderlyingSink(this, underlyingSink, highWaterMark, sizeAlgorithm);\n  }\n\n  /**\n   * Returns whether or not the writable stream is locked to a writer.\n   */\n  get locked(): boolean {\n    if (!IsWritableStream(this)) {\n      throw streamBrandCheckException('locked');\n    }\n\n    return IsWritableStreamLocked(this);\n  }\n\n  /**\n   * Aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be\n   * immediately moved to an errored state, with any queued-up writes discarded. This will also execute any abort\n   * mechanism of the underlying sink.\n   *\n   * The returned promise will fulfill if the stream shuts down successfully, or reject if the underlying sink signaled\n   * that there was an error doing so. Additionally, it will reject with a `TypeError` (without attempting to cancel\n   * the stream) if the stream is currently locked.\n   */\n  abort(reason: any = undefined): Promise<void> {\n    if (!IsWritableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('abort'));\n    }\n\n    if (IsWritableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot abort a stream that already has a writer'));\n    }\n\n    return WritableStreamAbort(this, reason);\n  }\n\n  /**\n   * Closes the stream. The underlying sink will finish processing any previously-written chunks, before invoking its\n   * close behavior. During this time any further attempts to write will fail (without erroring the stream).\n   *\n   * The method returns a promise that will fulfill if all remaining chunks are successfully written and the stream\n   * successfully closes, or rejects if an error is encountered during this process. Additionally, it will reject with\n   * a `TypeError` (without attempting to cancel the stream) if the stream is currently locked.\n   */\n  close() {\n    if (!IsWritableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('close'));\n    }\n\n    if (IsWritableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot close a stream that already has a writer'));\n    }\n\n    if (WritableStreamCloseQueuedOrInFlight(this)) {\n      return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));\n    }\n\n    return WritableStreamClose(this);\n  }\n\n  /**\n   * Creates a {@link WritableStreamDefaultWriter | writer} and locks the stream to the new writer. While the stream\n   * is locked, no other writer can be acquired until this one is released.\n   *\n   * This functionality is especially useful for creating abstractions that desire the ability to write to a stream\n   * without interruption or interleaving. By getting a writer for the stream, you can ensure nobody else can write at\n   * the same time, which would cause the resulting written data to be unpredictable and probably useless.\n   */\n  getWriter(): WritableStreamDefaultWriter<W> {\n    if (!IsWritableStream(this)) {\n      throw streamBrandCheckException('getWriter');\n    }\n\n    return AcquireWritableStreamDefaultWriter(this);\n  }\n}\n\nObject.defineProperties(WritableStream.prototype, {\n  abort: { enumerable: true },\n  close: { enumerable: true },\n  getWriter: { enumerable: true },\n  locked: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStream.prototype, Symbol.toStringTag, {\n    value: 'WritableStream',\n    configurable: true\n  });\n}\n\nexport {\n  AcquireWritableStreamDefaultWriter,\n  CreateWritableStream,\n  IsWritableStream,\n  IsWritableStreamLocked,\n  WritableStream,\n  WritableStreamAbort,\n  WritableStreamDefaultControllerErrorIfNeeded,\n  WritableStreamDefaultWriterCloseWithErrorPropagation,\n  WritableStreamDefaultWriterRelease,\n  WritableStreamDefaultWriterWrite,\n  WritableStreamCloseQueuedOrInFlight,\n  UnderlyingSink,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkAbortCallback\n};\n\n// Abstract operations for the WritableStream.\n\nfunction AcquireWritableStreamDefaultWriter<W>(stream: WritableStream<W>): WritableStreamDefaultWriter<W> {\n  return new WritableStreamDefaultWriter(stream);\n}\n\n// Throws if and only if startAlgorithm throws.\nfunction CreateWritableStream<W>(startAlgorithm: () => void | PromiseLike<void>,\n                                 writeAlgorithm: (chunk: W) => Promise<void>,\n                                 closeAlgorithm: () => Promise<void>,\n                                 abortAlgorithm: (reason: any) => Promise<void>,\n                                 highWaterMark = 1,\n                                 sizeAlgorithm: QueuingStrategySizeCallback<W> = () => 1) {\n  assert(IsNonNegativeNumber(highWaterMark));\n\n  const stream: WritableStream<W> = Object.create(WritableStream.prototype);\n  InitializeWritableStream(stream);\n\n  const controller: WritableStreamDefaultController<W> = Object.create(WritableStreamDefaultController.prototype);\n\n  SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm,\n                                       abortAlgorithm, highWaterMark, sizeAlgorithm);\n  return stream;\n}\n\nfunction InitializeWritableStream<W>(stream: WritableStream<W>) {\n  stream._state = 'writable';\n\n  // The error that will be reported by new method calls once the state becomes errored. Only set when [[state]] is\n  // 'erroring' or 'errored'. May be set to an undefined value.\n  stream._storedError = undefined;\n\n  stream._writer = undefined;\n\n  // Initialize to undefined first because the constructor of the controller checks this\n  // variable to validate the caller.\n  stream._writableStreamController = undefined!;\n\n  // This queue is placed here instead of the writer class in order to allow for passing a writer to the next data\n  // producer without waiting for the queued writes to finish.\n  stream._writeRequests = new SimpleQueue();\n\n  // Write requests are removed from _writeRequests when write() is called on the underlying sink. This prevents\n  // them from being erroneously rejected on error. If a write() call is in-flight, the request is stored here.\n  stream._inFlightWriteRequest = undefined;\n\n  // The promise that was returned from writer.close(). Stored here because it may be fulfilled after the writer\n  // has been detached.\n  stream._closeRequest = undefined;\n\n  // Close request is removed from _closeRequest when close() is called on the underlying sink. This prevents it\n  // from being erroneously rejected on error. If a close() call is in-flight, the request is stored here.\n  stream._inFlightCloseRequest = undefined;\n\n  // The promise that was returned from writer.abort(). This may also be fulfilled after the writer has detached.\n  stream._pendingAbortRequest = undefined;\n\n  // The backpressure signal set by the controller.\n  stream._backpressure = false;\n}\n\nfunction IsWritableStream(x: unknown): x is WritableStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_writableStreamController')) {\n    return false;\n  }\n\n  return x instanceof WritableStream;\n}\n\nfunction IsWritableStreamLocked(stream: WritableStream): boolean {\n  assert(IsWritableStream(stream));\n\n  if (stream._writer === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamAbort(stream: WritableStream, reason: any): Promise<undefined> {\n  if (stream._state === 'closed' || stream._state === 'errored') {\n    return promiseResolvedWith(undefined);\n  }\n  stream._writableStreamController._abortReason = reason;\n  stream._writableStreamController._abortController?.abort();\n\n  // TypeScript narrows the type of `stream._state` down to 'writable' | 'erroring',\n  // but it doesn't know that signaling abort runs author code that might have changed the state.\n  // Widen the type again by casting to WritableStreamState.\n  const state = stream._state as WritableStreamState;\n\n  if (state === 'closed' || state === 'errored') {\n    return promiseResolvedWith(undefined);\n  }\n  if (stream._pendingAbortRequest !== undefined) {\n    return stream._pendingAbortRequest._promise;\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n\n  let wasAlreadyErroring = false;\n  if (state === 'erroring') {\n    wasAlreadyErroring = true;\n    // reason will not be used, so don't keep a reference to it.\n    reason = undefined;\n  }\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    stream._pendingAbortRequest = {\n      _promise: undefined!,\n      _resolve: resolve,\n      _reject: reject,\n      _reason: reason,\n      _wasAlreadyErroring: wasAlreadyErroring\n    };\n  });\n  stream._pendingAbortRequest!._promise = promise;\n\n  if (!wasAlreadyErroring) {\n    WritableStreamStartErroring(stream, reason);\n  }\n\n  return promise;\n}\n\nfunction WritableStreamClose(stream: WritableStream<any>): Promise<undefined> {\n  const state = stream._state;\n  if (state === 'closed' || state === 'errored') {\n    return promiseRejectedWith(new TypeError(\n      `The stream (in ${state} state) is not in the writable state and cannot be closed`));\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n  assert(!WritableStreamCloseQueuedOrInFlight(stream));\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    const closeRequest: CloseRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._closeRequest = closeRequest;\n  });\n\n  const writer = stream._writer;\n  if (writer !== undefined && stream._backpressure && state === 'writable') {\n    defaultWriterReadyPromiseResolve(writer);\n  }\n\n  WritableStreamDefaultControllerClose(stream._writableStreamController);\n\n  return promise;\n}\n\n// WritableStream API exposed for controllers.\n\nfunction WritableStreamAddWriteRequest(stream: WritableStream): Promise<undefined> {\n  assert(IsWritableStreamLocked(stream));\n  assert(stream._state === 'writable');\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    const writeRequest: WriteRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._writeRequests.push(writeRequest);\n  });\n\n  return promise;\n}\n\nfunction WritableStreamDealWithRejection(stream: WritableStream, error: any) {\n  const state = stream._state;\n\n  if (state === 'writable') {\n    WritableStreamStartErroring(stream, error);\n    return;\n  }\n\n  assert(state === 'erroring');\n  WritableStreamFinishErroring(stream);\n}\n\nfunction WritableStreamStartErroring(stream: WritableStream, reason: any) {\n  assert(stream._storedError === undefined);\n  assert(stream._state === 'writable');\n\n  const controller = stream._writableStreamController;\n  assert(controller !== undefined);\n\n  stream._state = 'erroring';\n  stream._storedError = reason;\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);\n  }\n\n  if (!WritableStreamHasOperationMarkedInFlight(stream) && controller._started) {\n    WritableStreamFinishErroring(stream);\n  }\n}\n\nfunction WritableStreamFinishErroring(stream: WritableStream) {\n  assert(stream._state === 'erroring');\n  assert(!WritableStreamHasOperationMarkedInFlight(stream));\n  stream._state = 'errored';\n  stream._writableStreamController[ErrorSteps]();\n\n  const storedError = stream._storedError;\n  stream._writeRequests.forEach(writeRequest => {\n    writeRequest._reject(storedError);\n  });\n  stream._writeRequests = new SimpleQueue();\n\n  if (stream._pendingAbortRequest === undefined) {\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    return;\n  }\n\n  const abortRequest = stream._pendingAbortRequest;\n  stream._pendingAbortRequest = undefined;\n\n  if (abortRequest._wasAlreadyErroring) {\n    abortRequest._reject(storedError);\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    return;\n  }\n\n  const promise = stream._writableStreamController[AbortSteps](abortRequest._reason);\n  uponPromise(\n    promise,\n    () => {\n      abortRequest._resolve();\n      WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    },\n    (reason: any) => {\n      abortRequest._reject(reason);\n      WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    });\n}\n\nfunction WritableStreamFinishInFlightWrite(stream: WritableStream) {\n  assert(stream._inFlightWriteRequest !== undefined);\n  stream._inFlightWriteRequest!._resolve(undefined);\n  stream._inFlightWriteRequest = undefined;\n}\n\nfunction WritableStreamFinishInFlightWriteWithError(stream: WritableStream, error: any) {\n  assert(stream._inFlightWriteRequest !== undefined);\n  stream._inFlightWriteRequest!._reject(error);\n  stream._inFlightWriteRequest = undefined;\n\n  assert(stream._state === 'writable' || stream._state === 'erroring');\n\n  WritableStreamDealWithRejection(stream, error);\n}\n\nfunction WritableStreamFinishInFlightClose(stream: WritableStream) {\n  assert(stream._inFlightCloseRequest !== undefined);\n  stream._inFlightCloseRequest!._resolve(undefined);\n  stream._inFlightCloseRequest = undefined;\n\n  const state = stream._state;\n\n  assert(state === 'writable' || state === 'erroring');\n\n  if (state === 'erroring') {\n    // The error was too late to do anything, so it is ignored.\n    stream._storedError = undefined;\n    if (stream._pendingAbortRequest !== undefined) {\n      stream._pendingAbortRequest._resolve();\n      stream._pendingAbortRequest = undefined;\n    }\n  }\n\n  stream._state = 'closed';\n\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    defaultWriterClosedPromiseResolve(writer);\n  }\n\n  assert(stream._pendingAbortRequest === undefined);\n  assert(stream._storedError === undefined);\n}\n\nfunction WritableStreamFinishInFlightCloseWithError(stream: WritableStream, error: any) {\n  assert(stream._inFlightCloseRequest !== undefined);\n  stream._inFlightCloseRequest!._reject(error);\n  stream._inFlightCloseRequest = undefined;\n\n  assert(stream._state === 'writable' || stream._state === 'erroring');\n\n  // Never execute sink abort() after sink close().\n  if (stream._pendingAbortRequest !== undefined) {\n    stream._pendingAbortRequest._reject(error);\n    stream._pendingAbortRequest = undefined;\n  }\n  WritableStreamDealWithRejection(stream, error);\n}\n\n// TODO(ricea): Fix alphabetical order.\nfunction WritableStreamCloseQueuedOrInFlight(stream: WritableStream): boolean {\n  if (stream._closeRequest === undefined && stream._inFlightCloseRequest === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamHasOperationMarkedInFlight(stream: WritableStream): boolean {\n  if (stream._inFlightWriteRequest === undefined && stream._inFlightCloseRequest === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamMarkCloseRequestInFlight(stream: WritableStream) {\n  assert(stream._inFlightCloseRequest === undefined);\n  assert(stream._closeRequest !== undefined);\n  stream._inFlightCloseRequest = stream._closeRequest;\n  stream._closeRequest = undefined;\n}\n\nfunction WritableStreamMarkFirstWriteRequestInFlight(stream: WritableStream) {\n  assert(stream._inFlightWriteRequest === undefined);\n  assert(stream._writeRequests.length !== 0);\n  stream._inFlightWriteRequest = stream._writeRequests.shift();\n}\n\nfunction WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream: WritableStream) {\n  assert(stream._state === 'errored');\n  if (stream._closeRequest !== undefined) {\n    assert(stream._inFlightCloseRequest === undefined);\n\n    stream._closeRequest._reject(stream._storedError);\n    stream._closeRequest = undefined;\n  }\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    defaultWriterClosedPromiseReject(writer, stream._storedError);\n  }\n}\n\nfunction WritableStreamUpdateBackpressure(stream: WritableStream, backpressure: boolean) {\n  assert(stream._state === 'writable');\n  assert(!WritableStreamCloseQueuedOrInFlight(stream));\n\n  const writer = stream._writer;\n  if (writer !== undefined && backpressure !== stream._backpressure) {\n    if (backpressure) {\n      defaultWriterReadyPromiseReset(writer);\n    } else {\n      assert(!backpressure);\n\n      defaultWriterReadyPromiseResolve(writer);\n    }\n  }\n\n  stream._backpressure = backpressure;\n}\n\n/**\n * A default writer vended by a {@link WritableStream}.\n *\n * @public\n */\nexport class WritableStreamDefaultWriter<W = any> {\n  /** @internal */\n  _ownerWritableStream: WritableStream<W>;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _closedPromiseState!: 'pending' | 'resolved' | 'rejected';\n  /** @internal */\n  _readyPromise!: Promise<undefined>;\n  /** @internal */\n  _readyPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _readyPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readyPromiseState!: 'pending' | 'fulfilled' | 'rejected';\n\n  constructor(stream: WritableStream<W>) {\n    assertRequiredArgument(stream, 1, 'WritableStreamDefaultWriter');\n    assertWritableStream(stream, 'First parameter');\n\n    if (IsWritableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive writing by another writer');\n    }\n\n    this._ownerWritableStream = stream;\n    stream._writer = this;\n\n    const state = stream._state;\n\n    if (state === 'writable') {\n      if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._backpressure) {\n        defaultWriterReadyPromiseInitialize(this);\n      } else {\n        defaultWriterReadyPromiseInitializeAsResolved(this);\n      }\n\n      defaultWriterClosedPromiseInitialize(this);\n    } else if (state === 'erroring') {\n      defaultWriterReadyPromiseInitializeAsRejected(this, stream._storedError);\n      defaultWriterClosedPromiseInitialize(this);\n    } else if (state === 'closed') {\n      defaultWriterReadyPromiseInitializeAsResolved(this);\n      defaultWriterClosedPromiseInitializeAsResolved(this);\n    } else {\n      assert(state === 'errored');\n\n      const storedError = stream._storedError;\n      defaultWriterReadyPromiseInitializeAsRejected(this, storedError);\n      defaultWriterClosedPromiseInitializeAsRejected(this, storedError);\n    }\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or\n   * the writer’s lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * Returns the desired size to fill the stream’s internal queue. It can be negative, if the queue is over-full.\n   * A producer can use this information to determine the right amount of data to write.\n   *\n   * It will be `null` if the stream cannot be successfully written to (due to either being errored, or having an abort\n   * queued up). It will return zero if the stream is closed. And the getter will throw an exception if invoked when\n   * the writer’s lock is released.\n   */\n  get desiredSize(): number | null {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      throw defaultWriterBrandCheckException('desiredSize');\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      throw defaultWriterLockException('desiredSize');\n    }\n\n    return WritableStreamDefaultWriterGetDesiredSize(this);\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the desired size to fill the stream’s internal queue transitions\n   * from non-positive to positive, signaling that it is no longer applying backpressure. Once the desired size dips\n   * back to zero or below, the getter will return a new promise that stays pending until the next transition.\n   *\n   * If the stream becomes errored or aborted, or the writer’s lock is released, the returned promise will become\n   * rejected.\n   */\n  get ready(): Promise<undefined> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('ready'));\n    }\n\n    return this._readyPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link WritableStream.abort | stream.abort(reason)}.\n   */\n  abort(reason: any = undefined): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('abort'));\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('abort'));\n    }\n\n    return WritableStreamDefaultWriterAbort(this, reason);\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link WritableStream.close | stream.close()}.\n   */\n  close(): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('close'));\n    }\n\n    const stream = this._ownerWritableStream;\n\n    if (stream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('close'));\n    }\n\n    if (WritableStreamCloseQueuedOrInFlight(stream)) {\n      return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));\n    }\n\n    return WritableStreamDefaultWriterClose(this);\n  }\n\n  /**\n   * Releases the writer’s lock on the corresponding stream. After the lock is released, the writer is no longer active.\n   * If the associated stream is errored when the lock is released, the writer will appear errored in the same way from\n   * now on; otherwise, the writer will appear closed.\n   *\n   * Note that the lock can still be released even if some ongoing writes have not yet finished (i.e. even if the\n   * promises returned from previous calls to {@link WritableStreamDefaultWriter.write | write()} have not yet settled).\n   * It’s not necessary to hold the lock on the writer for the duration of the write; the lock instead simply prevents\n   * other producers from writing in an interleaved manner.\n   */\n  releaseLock(): void {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      throw defaultWriterBrandCheckException('releaseLock');\n    }\n\n    const stream = this._ownerWritableStream;\n\n    if (stream === undefined) {\n      return;\n    }\n\n    assert(stream._writer !== undefined);\n\n    WritableStreamDefaultWriterRelease(this);\n  }\n\n  /**\n   * Writes the given chunk to the writable stream, by waiting until any previous writes have finished successfully,\n   * and then sending the chunk to the underlying sink's {@link UnderlyingSink.write | write()} method. It will return\n   * a promise that fulfills with undefined upon a successful write, or rejects if the write fails or stream becomes\n   * errored before the writing process is initiated.\n   *\n   * Note that what \"success\" means is up to the underlying sink; it might indicate simply that the chunk has been\n   * accepted, and not necessarily that it is safely saved to its ultimate destination.\n   */\n  write(chunk: W): Promise<void>;\n  write(chunk: W = undefined!): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('write'));\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('write to'));\n    }\n\n    return WritableStreamDefaultWriterWrite(this, chunk);\n  }\n}\n\nObject.defineProperties(WritableStreamDefaultWriter.prototype, {\n  abort: { enumerable: true },\n  close: { enumerable: true },\n  releaseLock: { enumerable: true },\n  write: { enumerable: true },\n  closed: { enumerable: true },\n  desiredSize: { enumerable: true },\n  ready: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStreamDefaultWriter.prototype, Symbol.toStringTag, {\n    value: 'WritableStreamDefaultWriter',\n    configurable: true\n  });\n}\n\n// Abstract operations for the WritableStreamDefaultWriter.\n\nfunction IsWritableStreamDefaultWriter<W = any>(x: any): x is WritableStreamDefaultWriter<W> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) {\n    return false;\n  }\n\n  return x instanceof WritableStreamDefaultWriter;\n}\n\n// A client of WritableStreamDefaultWriter may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultWriterAbort(writer: WritableStreamDefaultWriter, reason: any) {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  return WritableStreamAbort(stream, reason);\n}\n\nfunction WritableStreamDefaultWriterClose(writer: WritableStreamDefaultWriter): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  return WritableStreamClose(stream);\n}\n\nfunction WritableStreamDefaultWriterCloseWithErrorPropagation(writer: WritableStreamDefaultWriter): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  const state = stream._state;\n  if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {\n    return promiseResolvedWith(undefined);\n  }\n\n  if (state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n\n  return WritableStreamDefaultWriterClose(writer);\n}\n\nfunction WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer: WritableStreamDefaultWriter, error: any) {\n  if (writer._closedPromiseState === 'pending') {\n    defaultWriterClosedPromiseReject(writer, error);\n  } else {\n    defaultWriterClosedPromiseResetToRejected(writer, error);\n  }\n}\n\nfunction WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer: WritableStreamDefaultWriter, error: any) {\n  if (writer._readyPromiseState === 'pending') {\n    defaultWriterReadyPromiseReject(writer, error);\n  } else {\n    defaultWriterReadyPromiseResetToRejected(writer, error);\n  }\n}\n\nfunction WritableStreamDefaultWriterGetDesiredSize(writer: WritableStreamDefaultWriter): number | null {\n  const stream = writer._ownerWritableStream;\n  const state = stream._state;\n\n  if (state === 'errored' || state === 'erroring') {\n    return null;\n  }\n\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return WritableStreamDefaultControllerGetDesiredSize(stream._writableStreamController);\n}\n\nfunction WritableStreamDefaultWriterRelease(writer: WritableStreamDefaultWriter) {\n  const stream = writer._ownerWritableStream;\n  assert(stream !== undefined);\n  assert(stream._writer === writer);\n\n  const releasedError = new TypeError(\n    `Writer was released and can no longer be used to monitor the stream's closedness`);\n\n  WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, releasedError);\n\n  // The state transitions to \"errored\" before the sink abort() method runs, but the writer.closed promise is not\n  // rejected until afterwards. This means that simply testing state will not work.\n  WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, releasedError);\n\n  stream._writer = undefined;\n  writer._ownerWritableStream = undefined!;\n}\n\nfunction WritableStreamDefaultWriterWrite<W>(writer: WritableStreamDefaultWriter<W>, chunk: W): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  const controller = stream._writableStreamController;\n\n  const chunkSize = WritableStreamDefaultControllerGetChunkSize(controller, chunk);\n\n  if (stream !== writer._ownerWritableStream) {\n    return promiseRejectedWith(defaultWriterLockException('write to'));\n  }\n\n  const state = stream._state;\n  if (state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n  if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {\n    return promiseRejectedWith(new TypeError('The stream is closing or closed and cannot be written to'));\n  }\n  if (state === 'erroring') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  assert(state === 'writable');\n\n  const promise = WritableStreamAddWriteRequest(stream);\n\n  WritableStreamDefaultControllerWrite(controller, chunk, chunkSize);\n\n  return promise;\n}\n\nconst closeSentinel: unique symbol = {} as any;\n\ntype QueueRecord<W> = W | typeof closeSentinel;\n\n/**\n * Allows control of a {@link WritableStream | writable stream}'s state and internal queue.\n *\n * @public\n */\nexport class WritableStreamDefaultController<W = any> {\n  /** @internal */\n  _controlledWritableStream!: WritableStream<W>;\n  /** @internal */\n  _queue!: SimpleQueue<QueuePair<QueueRecord<W>>>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _abortReason: any;\n  /** @internal */\n  _abortController: AbortController | undefined;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _strategySizeAlgorithm!: QueuingStrategySizeCallback<W>;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _writeAlgorithm!: (chunk: W) => Promise<void>;\n  /** @internal */\n  _closeAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _abortAlgorithm!: (reason: any) => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * The reason which was passed to `WritableStream.abort(reason)` when the stream was aborted.\n   *\n   * @deprecated\n   *  This property has been removed from the specification, see https://github.com/whatwg/streams/pull/1177.\n   *  Use {@link WritableStreamDefaultController.signal}'s `reason` instead.\n   */\n  get abortReason(): any {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('abortReason');\n    }\n    return this._abortReason;\n  }\n\n  /**\n   * An `AbortSignal` that can be used to abort the pending write or close operation when the stream is aborted.\n   */\n  get signal(): AbortSignal {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('signal');\n    }\n    if (this._abortController === undefined) {\n      // Older browsers or older Node versions may not support `AbortController` or `AbortSignal`.\n      // We don't want to bundle and ship an `AbortController` polyfill together with our polyfill,\n      // so instead we only implement support for `signal` if we find a global `AbortController` constructor.\n      throw new TypeError('WritableStreamDefaultController.prototype.signal is not supported');\n    }\n    return this._abortController.signal;\n  }\n\n  /**\n   * Closes the controlled writable stream, making all future interactions with it fail with the given error `e`.\n   *\n   * This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying\n   * sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the\n   * normal lifecycle of interactions with the underlying sink.\n   */\n  error(e: any = undefined): void {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n    const state = this._controlledWritableStream._state;\n    if (state !== 'writable') {\n      // The stream is closed, errored or will be soon. The sink can't do anything useful if it gets an error here, so\n      // just treat it as a no-op.\n      return;\n    }\n\n    WritableStreamDefaultControllerError(this, e);\n  }\n\n  /** @internal */\n  [AbortSteps](reason: any): Promise<void> {\n    const result = this._abortAlgorithm(reason);\n    WritableStreamDefaultControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [ErrorSteps]() {\n    ResetQueue(this);\n  }\n}\n\nObject.defineProperties(WritableStreamDefaultController.prototype, {\n  abortReason: { enumerable: true },\n  signal: { enumerable: true },\n  error: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'WritableStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Abstract operations implementing interface required by the WritableStream.\n\nfunction IsWritableStreamDefaultController(x: any): x is WritableStreamDefaultController<any> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledWritableStream')) {\n    return false;\n  }\n\n  return x instanceof WritableStreamDefaultController;\n}\n\nfunction SetUpWritableStreamDefaultController<W>(stream: WritableStream<W>,\n                                                 controller: WritableStreamDefaultController<W>,\n                                                 startAlgorithm: () => void | PromiseLike<void>,\n                                                 writeAlgorithm: (chunk: W) => Promise<void>,\n                                                 closeAlgorithm: () => Promise<void>,\n                                                 abortAlgorithm: (reason: any) => Promise<void>,\n                                                 highWaterMark: number,\n                                                 sizeAlgorithm: QueuingStrategySizeCallback<W>) {\n  assert(IsWritableStream(stream));\n  assert(stream._writableStreamController === undefined);\n\n  controller._controlledWritableStream = stream;\n  stream._writableStreamController = controller;\n\n  // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n  controller._queue = undefined!;\n  controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._abortReason = undefined;\n  controller._abortController = createAbortController();\n  controller._started = false;\n\n  controller._strategySizeAlgorithm = sizeAlgorithm;\n  controller._strategyHWM = highWaterMark;\n\n  controller._writeAlgorithm = writeAlgorithm;\n  controller._closeAlgorithm = closeAlgorithm;\n  controller._abortAlgorithm = abortAlgorithm;\n\n  const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n  WritableStreamUpdateBackpressure(stream, backpressure);\n\n  const startResult = startAlgorithm();\n  const startPromise = promiseResolvedWith(startResult);\n  uponPromise(\n    startPromise,\n    () => {\n      assert(stream._state === 'writable' || stream._state === 'erroring');\n      controller._started = true;\n      WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n    },\n    r => {\n      assert(stream._state === 'writable' || stream._state === 'erroring');\n      controller._started = true;\n      WritableStreamDealWithRejection(stream, r);\n    }\n  );\n}\n\nfunction SetUpWritableStreamDefaultControllerFromUnderlyingSink<W>(stream: WritableStream<W>,\n                                                                   underlyingSink: ValidatedUnderlyingSink<W>,\n                                                                   highWaterMark: number,\n                                                                   sizeAlgorithm: QueuingStrategySizeCallback<W>) {\n  const controller = Object.create(WritableStreamDefaultController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let writeAlgorithm: (chunk: W) => Promise<void> = () => promiseResolvedWith(undefined);\n  let closeAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let abortAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingSink.start !== undefined) {\n    startAlgorithm = () => underlyingSink.start!(controller);\n  }\n  if (underlyingSink.write !== undefined) {\n    writeAlgorithm = chunk => underlyingSink.write!(chunk, controller);\n  }\n  if (underlyingSink.close !== undefined) {\n    closeAlgorithm = () => underlyingSink.close!();\n  }\n  if (underlyingSink.abort !== undefined) {\n    abortAlgorithm = reason => underlyingSink.abort!(reason);\n  }\n\n  SetUpWritableStreamDefaultController(\n    stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm\n  );\n}\n\n// ClearAlgorithms may be called twice. Erroring the same stream in multiple ways will often result in redundant calls.\nfunction WritableStreamDefaultControllerClearAlgorithms(controller: WritableStreamDefaultController<any>) {\n  controller._writeAlgorithm = undefined!;\n  controller._closeAlgorithm = undefined!;\n  controller._abortAlgorithm = undefined!;\n  controller._strategySizeAlgorithm = undefined!;\n}\n\nfunction WritableStreamDefaultControllerClose<W>(controller: WritableStreamDefaultController<W>) {\n  EnqueueValueWithSize(controller, closeSentinel, 0);\n  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\nfunction WritableStreamDefaultControllerGetChunkSize<W>(controller: WritableStreamDefaultController<W>,\n                                                        chunk: W): number {\n  try {\n    return controller._strategySizeAlgorithm(chunk);\n  } catch (chunkSizeE) {\n    WritableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE);\n    return 1;\n  }\n}\n\nfunction WritableStreamDefaultControllerGetDesiredSize(controller: WritableStreamDefaultController<any>): number {\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\nfunction WritableStreamDefaultControllerWrite<W>(controller: WritableStreamDefaultController<W>,\n                                                 chunk: W,\n                                                 chunkSize: number) {\n  try {\n    EnqueueValueWithSize(controller, chunk, chunkSize);\n  } catch (enqueueE) {\n    WritableStreamDefaultControllerErrorIfNeeded(controller, enqueueE);\n    return;\n  }\n\n  const stream = controller._controlledWritableStream;\n  if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._state === 'writable') {\n    const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n    WritableStreamUpdateBackpressure(stream, backpressure);\n  }\n\n  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\n// Abstract operations for the WritableStreamDefaultController.\n\nfunction WritableStreamDefaultControllerAdvanceQueueIfNeeded<W>(controller: WritableStreamDefaultController<W>) {\n  const stream = controller._controlledWritableStream;\n\n  if (!controller._started) {\n    return;\n  }\n\n  if (stream._inFlightWriteRequest !== undefined) {\n    return;\n  }\n\n  const state = stream._state;\n  assert(state !== 'closed' && state !== 'errored');\n  if (state === 'erroring') {\n    WritableStreamFinishErroring(stream);\n    return;\n  }\n\n  if (controller._queue.length === 0) {\n    return;\n  }\n\n  const value = PeekQueueValue(controller);\n  if (value === closeSentinel) {\n    WritableStreamDefaultControllerProcessClose(controller);\n  } else {\n    WritableStreamDefaultControllerProcessWrite(controller, value);\n  }\n}\n\nfunction WritableStreamDefaultControllerErrorIfNeeded(controller: WritableStreamDefaultController<any>, error: any) {\n  if (controller._controlledWritableStream._state === 'writable') {\n    WritableStreamDefaultControllerError(controller, error);\n  }\n}\n\nfunction WritableStreamDefaultControllerProcessClose(controller: WritableStreamDefaultController<any>) {\n  const stream = controller._controlledWritableStream;\n\n  WritableStreamMarkCloseRequestInFlight(stream);\n\n  DequeueValue(controller);\n  assert(controller._queue.length === 0);\n\n  const sinkClosePromise = controller._closeAlgorithm();\n  WritableStreamDefaultControllerClearAlgorithms(controller);\n  uponPromise(\n    sinkClosePromise,\n    () => {\n      WritableStreamFinishInFlightClose(stream);\n    },\n    reason => {\n      WritableStreamFinishInFlightCloseWithError(stream, reason);\n    }\n  );\n}\n\nfunction WritableStreamDefaultControllerProcessWrite<W>(controller: WritableStreamDefaultController<W>, chunk: W) {\n  const stream = controller._controlledWritableStream;\n\n  WritableStreamMarkFirstWriteRequestInFlight(stream);\n\n  const sinkWritePromise = controller._writeAlgorithm(chunk);\n  uponPromise(\n    sinkWritePromise,\n    () => {\n      WritableStreamFinishInFlightWrite(stream);\n\n      const state = stream._state;\n      assert(state === 'writable' || state === 'erroring');\n\n      DequeueValue(controller);\n\n      if (!WritableStreamCloseQueuedOrInFlight(stream) && state === 'writable') {\n        const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n        WritableStreamUpdateBackpressure(stream, backpressure);\n      }\n\n      WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n    },\n    reason => {\n      if (stream._state === 'writable') {\n        WritableStreamDefaultControllerClearAlgorithms(controller);\n      }\n      WritableStreamFinishInFlightWriteWithError(stream, reason);\n    }\n  );\n}\n\nfunction WritableStreamDefaultControllerGetBackpressure(controller: WritableStreamDefaultController<any>): boolean {\n  const desiredSize = WritableStreamDefaultControllerGetDesiredSize(controller);\n  return desiredSize <= 0;\n}\n\n// A client of WritableStreamDefaultController may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultControllerError(controller: WritableStreamDefaultController<any>, error: any) {\n  const stream = controller._controlledWritableStream;\n\n  assert(stream._state === 'writable');\n\n  WritableStreamDefaultControllerClearAlgorithms(controller);\n  WritableStreamStartErroring(stream, error);\n}\n\n// Helper functions for the WritableStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(`WritableStream.prototype.${name} can only be used on a WritableStream`);\n}\n\n// Helper functions for the WritableStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `WritableStreamDefaultController.prototype.${name} can only be used on a WritableStreamDefaultController`);\n}\n\n\n// Helper functions for the WritableStreamDefaultWriter.\n\nfunction defaultWriterBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `WritableStreamDefaultWriter.prototype.${name} can only be used on a WritableStreamDefaultWriter`);\n}\n\nfunction defaultWriterLockException(name: string): TypeError {\n  return new TypeError('Cannot ' + name + ' a stream using a released writer');\n}\n\nfunction defaultWriterClosedPromiseInitialize(writer: WritableStreamDefaultWriter) {\n  writer._closedPromise = newPromise((resolve, reject) => {\n    writer._closedPromise_resolve = resolve;\n    writer._closedPromise_reject = reject;\n    writer._closedPromiseState = 'pending';\n  });\n}\n\nfunction defaultWriterClosedPromiseInitializeAsRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  defaultWriterClosedPromiseInitialize(writer);\n  defaultWriterClosedPromiseReject(writer, reason);\n}\n\nfunction defaultWriterClosedPromiseInitializeAsResolved(writer: WritableStreamDefaultWriter) {\n  defaultWriterClosedPromiseInitialize(writer);\n  defaultWriterClosedPromiseResolve(writer);\n}\n\nfunction defaultWriterClosedPromiseReject(writer: WritableStreamDefaultWriter, reason: any) {\n  if (writer._closedPromise_reject === undefined) {\n    return;\n  }\n  assert(writer._closedPromiseState === 'pending');\n\n  setPromiseIsHandledToTrue(writer._closedPromise);\n  writer._closedPromise_reject(reason);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'rejected';\n}\n\nfunction defaultWriterClosedPromiseResetToRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  assert(writer._closedPromise_resolve === undefined);\n  assert(writer._closedPromise_reject === undefined);\n  assert(writer._closedPromiseState !== 'pending');\n\n  defaultWriterClosedPromiseInitializeAsRejected(writer, reason);\n}\n\nfunction defaultWriterClosedPromiseResolve(writer: WritableStreamDefaultWriter) {\n  if (writer._closedPromise_resolve === undefined) {\n    return;\n  }\n  assert(writer._closedPromiseState === 'pending');\n\n  writer._closedPromise_resolve(undefined);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'resolved';\n}\n\nfunction defaultWriterReadyPromiseInitialize(writer: WritableStreamDefaultWriter) {\n  writer._readyPromise = newPromise((resolve, reject) => {\n    writer._readyPromise_resolve = resolve;\n    writer._readyPromise_reject = reject;\n  });\n  writer._readyPromiseState = 'pending';\n}\n\nfunction defaultWriterReadyPromiseInitializeAsRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  defaultWriterReadyPromiseInitialize(writer);\n  defaultWriterReadyPromiseReject(writer, reason);\n}\n\nfunction defaultWriterReadyPromiseInitializeAsResolved(writer: WritableStreamDefaultWriter) {\n  defaultWriterReadyPromiseInitialize(writer);\n  defaultWriterReadyPromiseResolve(writer);\n}\n\nfunction defaultWriterReadyPromiseReject(writer: WritableStreamDefaultWriter, reason: any) {\n  if (writer._readyPromise_reject === undefined) {\n    return;\n  }\n\n  setPromiseIsHandledToTrue(writer._readyPromise);\n  writer._readyPromise_reject(reason);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'rejected';\n}\n\nfunction defaultWriterReadyPromiseReset(writer: WritableStreamDefaultWriter) {\n  assert(writer._readyPromise_resolve === undefined);\n  assert(writer._readyPromise_reject === undefined);\n\n  defaultWriterReadyPromiseInitialize(writer);\n}\n\nfunction defaultWriterReadyPromiseResetToRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  assert(writer._readyPromise_resolve === undefined);\n  assert(writer._readyPromise_reject === undefined);\n\n  defaultWriterReadyPromiseInitializeAsRejected(writer, reason);\n}\n\nfunction defaultWriterReadyPromiseResolve(writer: WritableStreamDefaultWriter) {\n  if (writer._readyPromise_resolve === undefined) {\n    return;\n  }\n\n  writer._readyPromise_resolve(undefined);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'fulfilled';\n}\n","/// <reference lib=\"dom\" />\nexport const NativeDOMException: typeof DOMException | undefined =\n  typeof DOMException !== 'undefined' ? DOMException : undefined;\n","/// <reference types=\"node\" />\nimport { NativeDOMException } from './native';\n\ndeclare class DOMExceptionClass extends Error {\n  constructor(message?: string, name?: string);\n\n  name: string;\n  message: string;\n}\n\ntype DOMException = DOMExceptionClass;\ntype DOMExceptionConstructor = typeof DOMExceptionClass;\n\nfunction isDOMExceptionConstructor(ctor: unknown): ctor is DOMExceptionConstructor {\n  if (!(typeof ctor === 'function' || typeof ctor === 'object')) {\n    return false;\n  }\n  try {\n    new (ctor as DOMExceptionConstructor)();\n    return true;\n  } catch {\n    return false;\n  }\n}\n\nfunction createDOMExceptionPolyfill(): DOMExceptionConstructor {\n  // eslint-disable-next-line no-shadow\n  const ctor = function DOMException(this: DOMException, message?: string, name?: string) {\n    this.message = message || '';\n    this.name = name || 'Error';\n    if (Error.captureStackTrace) {\n      Error.captureStackTrace(this, this.constructor);\n    }\n  } as any;\n  ctor.prototype = Object.create(Error.prototype);\n  Object.defineProperty(ctor.prototype, 'constructor', { value: ctor, writable: true, configurable: true });\n  return ctor;\n}\n\n// eslint-disable-next-line no-redeclare\nconst DOMException: DOMExceptionConstructor =\n  isDOMExceptionConstructor(NativeDOMException) ? NativeDOMException : createDOMExceptionPolyfill();\n\nexport { DOMException };\n","import { IsReadableStream, IsReadableStreamLocked, ReadableStream, ReadableStreamCancel } from '../readable-stream';\nimport { AcquireReadableStreamDefaultReader, ReadableStreamDefaultReaderRead } from './default-reader';\nimport { ReadableStreamReaderGenericRelease } from './generic-reader';\nimport {\n  AcquireWritableStreamDefaultWriter,\n  IsWritableStream,\n  IsWritableStreamLocked,\n  WritableStream,\n  WritableStreamAbort,\n  WritableStreamCloseQueuedOrInFlight,\n  WritableStreamDefaultWriterCloseWithErrorPropagation,\n  WritableStreamDefaultWriterRelease,\n  WritableStreamDefaultWriterWrite\n} from '../writable-stream';\nimport assert from '../../stub/assert';\nimport {\n  newPromise,\n  PerformPromiseThen,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  uponFulfillment,\n  uponPromise,\n  uponRejection\n} from '../helpers/webidl';\nimport { noop } from '../../utils';\nimport { AbortSignal, isAbortSignal } from '../abort-signal';\nimport { DOMException } from '../../stub/dom-exception';\n\nexport function ReadableStreamPipeTo<T>(source: ReadableStream<T>,\n                                        dest: WritableStream<T>,\n                                        preventClose: boolean,\n                                        preventAbort: boolean,\n                                        preventCancel: boolean,\n                                        signal: AbortSignal | undefined): Promise<undefined> {\n  assert(IsReadableStream(source));\n  assert(IsWritableStream(dest));\n  assert(typeof preventClose === 'boolean');\n  assert(typeof preventAbort === 'boolean');\n  assert(typeof preventCancel === 'boolean');\n  assert(signal === undefined || isAbortSignal(signal));\n  assert(!IsReadableStreamLocked(source));\n  assert(!IsWritableStreamLocked(dest));\n\n  const reader = AcquireReadableStreamDefaultReader<T>(source);\n  const writer = AcquireWritableStreamDefaultWriter<T>(dest);\n\n  source._disturbed = true;\n\n  let shuttingDown = false;\n\n  // This is used to keep track of the spec's requirement that we wait for ongoing writes during shutdown.\n  let currentWrite = promiseResolvedWith<void>(undefined);\n\n  return newPromise((resolve, reject) => {\n    let abortAlgorithm: () => void;\n    if (signal !== undefined) {\n      abortAlgorithm = () => {\n        const error = new DOMException('Aborted', 'AbortError');\n        const actions: Array<() => Promise<void>> = [];\n        if (!preventAbort) {\n          actions.push(() => {\n            if (dest._state === 'writable') {\n              return WritableStreamAbort(dest, error);\n            }\n            return promiseResolvedWith(undefined);\n          });\n        }\n        if (!preventCancel) {\n          actions.push(() => {\n            if (source._state === 'readable') {\n              return ReadableStreamCancel(source, error);\n            }\n            return promiseResolvedWith(undefined);\n          });\n        }\n        shutdownWithAction(() => Promise.all(actions.map(action => action())), true, error);\n      };\n\n      if (signal.aborted) {\n        abortAlgorithm();\n        return;\n      }\n\n      signal.addEventListener('abort', abortAlgorithm);\n    }\n\n    // Using reader and writer, read all chunks from this and write them to dest\n    // - Backpressure must be enforced\n    // - Shutdown must stop all activity\n    function pipeLoop() {\n      return newPromise<void>((resolveLoop, rejectLoop) => {\n        function next(done: boolean) {\n          if (done) {\n            resolveLoop();\n          } else {\n            // Use `PerformPromiseThen` instead of `uponPromise` to avoid\n            // adding unnecessary `.catch(rethrowAssertionErrorRejection)` handlers\n            PerformPromiseThen(pipeStep(), next, rejectLoop);\n          }\n        }\n\n        next(false);\n      });\n    }\n\n    function pipeStep(): Promise<boolean> {\n      if (shuttingDown) {\n        return promiseResolvedWith(true);\n      }\n\n      return PerformPromiseThen(writer._readyPromise, () => {\n        return newPromise<boolean>((resolveRead, rejectRead) => {\n          ReadableStreamDefaultReaderRead(\n            reader,\n            {\n              _chunkSteps: chunk => {\n                currentWrite = PerformPromiseThen(WritableStreamDefaultWriterWrite(writer, chunk), undefined, noop);\n                resolveRead(false);\n              },\n              _closeSteps: () => resolveRead(true),\n              _errorSteps: rejectRead\n            }\n          );\n        });\n      });\n    }\n\n    // Errors must be propagated forward\n    isOrBecomesErrored(source, reader._closedPromise, storedError => {\n      if (!preventAbort) {\n        shutdownWithAction(() => WritableStreamAbort(dest, storedError), true, storedError);\n      } else {\n        shutdown(true, storedError);\n      }\n    });\n\n    // Errors must be propagated backward\n    isOrBecomesErrored(dest, writer._closedPromise, storedError => {\n      if (!preventCancel) {\n        shutdownWithAction(() => ReadableStreamCancel(source, storedError), true, storedError);\n      } else {\n        shutdown(true, storedError);\n      }\n    });\n\n    // Closing must be propagated forward\n    isOrBecomesClosed(source, reader._closedPromise, () => {\n      if (!preventClose) {\n        shutdownWithAction(() => WritableStreamDefaultWriterCloseWithErrorPropagation(writer));\n      } else {\n        shutdown();\n      }\n    });\n\n    // Closing must be propagated backward\n    if (WritableStreamCloseQueuedOrInFlight(dest) || dest._state === 'closed') {\n      const destClosed = new TypeError('the destination writable stream closed before all data could be piped to it');\n\n      if (!preventCancel) {\n        shutdownWithAction(() => ReadableStreamCancel(source, destClosed), true, destClosed);\n      } else {\n        shutdown(true, destClosed);\n      }\n    }\n\n    setPromiseIsHandledToTrue(pipeLoop());\n\n    function waitForWritesToFinish(): Promise<void> {\n      // Another write may have started while we were waiting on this currentWrite, so we have to be sure to wait\n      // for that too.\n      const oldCurrentWrite = currentWrite;\n      return PerformPromiseThen(\n        currentWrite,\n        () => oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined\n      );\n    }\n\n    function isOrBecomesErrored(stream: ReadableStream | WritableStream,\n                                promise: Promise<void>,\n                                action: (reason: any) => void) {\n      if (stream._state === 'errored') {\n        action(stream._storedError);\n      } else {\n        uponRejection(promise, action);\n      }\n    }\n\n    function isOrBecomesClosed(stream: ReadableStream | WritableStream, promise: Promise<void>, action: () => void) {\n      if (stream._state === 'closed') {\n        action();\n      } else {\n        uponFulfillment(promise, action);\n      }\n    }\n\n    function shutdownWithAction(action: () => Promise<unknown>, originalIsError?: boolean, originalError?: any) {\n      if (shuttingDown) {\n        return;\n      }\n      shuttingDown = true;\n\n      if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {\n        uponFulfillment(waitForWritesToFinish(), doTheRest);\n      } else {\n        doTheRest();\n      }\n\n      function doTheRest() {\n        uponPromise(\n          action(),\n          () => finalize(originalIsError, originalError),\n          newError => finalize(true, newError)\n        );\n      }\n    }\n\n    function shutdown(isError?: boolean, error?: any) {\n      if (shuttingDown) {\n        return;\n      }\n      shuttingDown = true;\n\n      if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {\n        uponFulfillment(waitForWritesToFinish(), () => finalize(isError, error));\n      } else {\n        finalize(isError, error);\n      }\n    }\n\n    function finalize(isError?: boolean, error?: any) {\n      WritableStreamDefaultWriterRelease(writer);\n      ReadableStreamReaderGenericRelease(reader);\n\n      if (signal !== undefined) {\n        signal.removeEventListener('abort', abortAlgorithm);\n      }\n      if (isError) {\n        reject(error);\n      } else {\n        resolve(undefined);\n      }\n    }\n  });\n}\n","import { QueuingStrategySizeCallback } from '../queuing-strategy';\nimport assert from '../../stub/assert';\nimport { DequeueValue, EnqueueValueWithSize, QueuePair, ResetQueue } from '../abstract-ops/queue-with-sizes';\nimport {\n  ReadableStreamAddReadRequest,\n  ReadableStreamFulfillReadRequest,\n  ReadableStreamGetNumReadRequests,\n  ReadRequest\n} from './default-reader';\nimport { SimpleQueue } from '../simple-queue';\nimport { IsReadableStreamLocked, ReadableStream, ReadableStreamClose, ReadableStreamError } from '../readable-stream';\nimport { ValidatedUnderlyingSource } from './underlying-source';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { CancelSteps, PullSteps } from '../abstract-ops/internal-methods';\nimport { promiseResolvedWith, uponPromise } from '../helpers/webidl';\n\n/**\n * Allows control of a {@link ReadableStream | readable stream}'s state and internal queue.\n *\n * @public\n */\nexport class ReadableStreamDefaultController<R> {\n  /** @internal */\n  _controlledReadableStream!: ReadableStream<R>;\n  /** @internal */\n  _queue!: SimpleQueue<QueuePair<R>>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _closeRequested!: boolean;\n  /** @internal */\n  _pullAgain!: boolean;\n  /** @internal */\n  _pulling !: boolean;\n  /** @internal */\n  _strategySizeAlgorithm!: QueuingStrategySizeCallback<R>;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _pullAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _cancelAlgorithm!: (reason: any) => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is\n   * over-full. An underlying source ought to use this information to determine when and how to apply backpressure.\n   */\n  get desiredSize(): number | null {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('desiredSize');\n    }\n\n    return ReadableStreamDefaultControllerGetDesiredSize(this);\n  }\n\n  /**\n   * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from\n   * the stream, but once those are read, the stream will become closed.\n   */\n  close(): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('close');\n    }\n\n    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {\n      throw new TypeError('The stream is not in a state that permits close');\n    }\n\n    ReadableStreamDefaultControllerClose(this);\n  }\n\n  /**\n   * Enqueues the given chunk `chunk` in the controlled readable stream.\n   */\n  enqueue(chunk: R): void;\n  enqueue(chunk: R = undefined!): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('enqueue');\n    }\n\n    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {\n      throw new TypeError('The stream is not in a state that permits enqueue');\n    }\n\n    return ReadableStreamDefaultControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.\n   */\n  error(e: any = undefined): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n\n    ReadableStreamDefaultControllerError(this, e);\n  }\n\n  /** @internal */\n  [CancelSteps](reason: any): Promise<void> {\n    ResetQueue(this);\n    const result = this._cancelAlgorithm(reason);\n    ReadableStreamDefaultControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [PullSteps](readRequest: ReadRequest<R>): void {\n    const stream = this._controlledReadableStream;\n\n    if (this._queue.length > 0) {\n      const chunk = DequeueValue(this);\n\n      if (this._closeRequested && this._queue.length === 0) {\n        ReadableStreamDefaultControllerClearAlgorithms(this);\n        ReadableStreamClose(stream);\n      } else {\n        ReadableStreamDefaultControllerCallPullIfNeeded(this);\n      }\n\n      readRequest._chunkSteps(chunk);\n    } else {\n      ReadableStreamAddReadRequest(stream, readRequest);\n      ReadableStreamDefaultControllerCallPullIfNeeded(this);\n    }\n  }\n}\n\nObject.defineProperties(ReadableStreamDefaultController.prototype, {\n  close: { enumerable: true },\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Abstract operations for the ReadableStreamDefaultController.\n\nfunction IsReadableStreamDefaultController<R = any>(x: any): x is ReadableStreamDefaultController<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableStream')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamDefaultController;\n}\n\nfunction ReadableStreamDefaultControllerCallPullIfNeeded(controller: ReadableStreamDefaultController<any>): void {\n  const shouldPull = ReadableStreamDefaultControllerShouldCallPull(controller);\n  if (!shouldPull) {\n    return;\n  }\n\n  if (controller._pulling) {\n    controller._pullAgain = true;\n    return;\n  }\n\n  assert(!controller._pullAgain);\n\n  controller._pulling = true;\n\n  const pullPromise = controller._pullAlgorithm();\n  uponPromise(\n    pullPromise,\n    () => {\n      controller._pulling = false;\n\n      if (controller._pullAgain) {\n        controller._pullAgain = false;\n        ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n      }\n    },\n    e => {\n      ReadableStreamDefaultControllerError(controller, e);\n    }\n  );\n}\n\nfunction ReadableStreamDefaultControllerShouldCallPull(controller: ReadableStreamDefaultController<any>): boolean {\n  const stream = controller._controlledReadableStream;\n\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return false;\n  }\n\n  if (!controller._started) {\n    return false;\n  }\n\n  if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    return true;\n  }\n\n  const desiredSize = ReadableStreamDefaultControllerGetDesiredSize(controller);\n  assert(desiredSize !== null);\n  if (desiredSize! > 0) {\n    return true;\n  }\n\n  return false;\n}\n\nfunction ReadableStreamDefaultControllerClearAlgorithms(controller: ReadableStreamDefaultController<any>) {\n  controller._pullAlgorithm = undefined!;\n  controller._cancelAlgorithm = undefined!;\n  controller._strategySizeAlgorithm = undefined!;\n}\n\n// A client of ReadableStreamDefaultController may use these functions directly to bypass state check.\n\nexport function ReadableStreamDefaultControllerClose(controller: ReadableStreamDefaultController<any>) {\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return;\n  }\n\n  const stream = controller._controlledReadableStream;\n\n  controller._closeRequested = true;\n\n  if (controller._queue.length === 0) {\n    ReadableStreamDefaultControllerClearAlgorithms(controller);\n    ReadableStreamClose(stream);\n  }\n}\n\nexport function ReadableStreamDefaultControllerEnqueue<R>(\n  controller: ReadableStreamDefaultController<R>,\n  chunk: R\n): void {\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return;\n  }\n\n  const stream = controller._controlledReadableStream;\n\n  if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    ReadableStreamFulfillReadRequest(stream, chunk, false);\n  } else {\n    let chunkSize;\n    try {\n      chunkSize = controller._strategySizeAlgorithm(chunk);\n    } catch (chunkSizeE) {\n      ReadableStreamDefaultControllerError(controller, chunkSizeE);\n      throw chunkSizeE;\n    }\n\n    try {\n      EnqueueValueWithSize(controller, chunk, chunkSize);\n    } catch (enqueueE) {\n      ReadableStreamDefaultControllerError(controller, enqueueE);\n      throw enqueueE;\n    }\n  }\n\n  ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n}\n\nexport function ReadableStreamDefaultControllerError(controller: ReadableStreamDefaultController<any>, e: any) {\n  const stream = controller._controlledReadableStream;\n\n  if (stream._state !== 'readable') {\n    return;\n  }\n\n  ResetQueue(controller);\n\n  ReadableStreamDefaultControllerClearAlgorithms(controller);\n  ReadableStreamError(stream, e);\n}\n\nexport function ReadableStreamDefaultControllerGetDesiredSize(\n  controller: ReadableStreamDefaultController<any>\n): number | null {\n  const state = controller._controlledReadableStream._state;\n\n  if (state === 'errored') {\n    return null;\n  }\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\n// This is used in the implementation of TransformStream.\nexport function ReadableStreamDefaultControllerHasBackpressure(\n  controller: ReadableStreamDefaultController<any>\n): boolean {\n  if (ReadableStreamDefaultControllerShouldCallPull(controller)) {\n    return false;\n  }\n\n  return true;\n}\n\nexport function ReadableStreamDefaultControllerCanCloseOrEnqueue(\n  controller: ReadableStreamDefaultController<any>\n): boolean {\n  const state = controller._controlledReadableStream._state;\n\n  if (!controller._closeRequested && state === 'readable') {\n    return true;\n  }\n\n  return false;\n}\n\nexport function SetUpReadableStreamDefaultController<R>(stream: ReadableStream<R>,\n                                                        controller: ReadableStreamDefaultController<R>,\n                                                        startAlgorithm: () => void | PromiseLike<void>,\n                                                        pullAlgorithm: () => Promise<void>,\n                                                        cancelAlgorithm: (reason: any) => Promise<void>,\n                                                        highWaterMark: number,\n                                                        sizeAlgorithm: QueuingStrategySizeCallback<R>) {\n  assert(stream._readableStreamController === undefined);\n\n  controller._controlledReadableStream = stream;\n\n  controller._queue = undefined!;\n  controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._started = false;\n  controller._closeRequested = false;\n  controller._pullAgain = false;\n  controller._pulling = false;\n\n  controller._strategySizeAlgorithm = sizeAlgorithm;\n  controller._strategyHWM = highWaterMark;\n\n  controller._pullAlgorithm = pullAlgorithm;\n  controller._cancelAlgorithm = cancelAlgorithm;\n\n  stream._readableStreamController = controller;\n\n  const startResult = startAlgorithm();\n  uponPromise(\n    promiseResolvedWith(startResult),\n    () => {\n      controller._started = true;\n\n      assert(!controller._pulling);\n      assert(!controller._pullAgain);\n\n      ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n    },\n    r => {\n      ReadableStreamDefaultControllerError(controller, r);\n    }\n  );\n}\n\nexport function SetUpReadableStreamDefaultControllerFromUnderlyingSource<R>(\n  stream: ReadableStream<R>,\n  underlyingSource: ValidatedUnderlyingSource<R>,\n  highWaterMark: number,\n  sizeAlgorithm: QueuingStrategySizeCallback<R>\n) {\n  const controller: ReadableStreamDefaultController<R> = Object.create(ReadableStreamDefaultController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let pullAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let cancelAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingSource.start !== undefined) {\n    startAlgorithm = () => underlyingSource.start!(controller);\n  }\n  if (underlyingSource.pull !== undefined) {\n    pullAlgorithm = () => underlyingSource.pull!(controller);\n  }\n  if (underlyingSource.cancel !== undefined) {\n    cancelAlgorithm = reason => underlyingSource.cancel!(reason);\n  }\n\n  SetUpReadableStreamDefaultController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm\n  );\n}\n\n// Helper functions for the ReadableStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamDefaultController.prototype.${name} can only be used on a ReadableStreamDefaultController`);\n}\n","import {\n  CreateReadableByteStream,\n  CreateReadableStream,\n  IsReadableStream,\n  ReadableByteStream,\n  ReadableStream,\n  ReadableStreamCancel,\n  ReadableStreamReader\n} from '../readable-stream';\nimport { ReadableStreamReaderGenericRelease } from './generic-reader';\nimport {\n  AcquireReadableStreamDefaultReader,\n  IsReadableStreamDefaultReader,\n  ReadableStreamDefaultReaderRead,\n  ReadRequest\n} from './default-reader';\nimport {\n  AcquireReadableStreamBYOBReader,\n  IsReadableStreamBYOBReader,\n  ReadableStreamBYOBReaderRead,\n  ReadIntoRequest\n} from './byob-reader';\nimport assert from '../../stub/assert';\nimport { newPromise, promiseResolvedWith, queueMicrotask, uponRejection } from '../helpers/webidl';\nimport {\n  ReadableStreamDefaultController,\n  ReadableStreamDefaultControllerClose,\n  ReadableStreamDefaultControllerEnqueue,\n  ReadableStreamDefaultControllerError\n} from './default-controller';\nimport {\n  IsReadableByteStreamController,\n  ReadableByteStreamControllerClose,\n  ReadableByteStreamControllerEnqueue,\n  ReadableByteStreamControllerError,\n  ReadableByteStreamControllerGetBYOBRequest,\n  ReadableByteStreamControllerRespond,\n  ReadableByteStreamControllerRespondWithNewView\n} from './byte-stream-controller';\nimport { CreateArrayFromList } from '../abstract-ops/ecmascript';\nimport { CloneAsUint8Array } from '../abstract-ops/miscellaneous';\n\nexport function ReadableStreamTee<R>(stream: ReadableStream<R>,\n                                     cloneForBranch2: boolean): [ReadableStream<R>, ReadableStream<R>] {\n  assert(IsReadableStream(stream));\n  assert(typeof cloneForBranch2 === 'boolean');\n  if (IsReadableByteStreamController(stream._readableStreamController)) {\n    return ReadableByteStreamTee(stream as unknown as ReadableByteStream) as\n      unknown as [ReadableStream<R>, ReadableStream<R>];\n  }\n  return ReadableStreamDefaultTee(stream, cloneForBranch2);\n}\n\nexport function ReadableStreamDefaultTee<R>(stream: ReadableStream<R>,\n                                            cloneForBranch2: boolean): [ReadableStream<R>, ReadableStream<R>] {\n  assert(IsReadableStream(stream));\n  assert(typeof cloneForBranch2 === 'boolean');\n\n  const reader = AcquireReadableStreamDefaultReader<R>(stream);\n\n  let reading = false;\n  let readAgain = false;\n  let canceled1 = false;\n  let canceled2 = false;\n  let reason1: any;\n  let reason2: any;\n  let branch1: ReadableStream<R>;\n  let branch2: ReadableStream<R>;\n\n  let resolveCancelPromise: (value: undefined | Promise<undefined>) => void;\n  const cancelPromise = newPromise<undefined>(resolve => {\n    resolveCancelPromise = resolve;\n  });\n\n  function pullAlgorithm(): Promise<void> {\n    if (reading) {\n      readAgain = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgain = false;\n          const chunk1 = chunk;\n          const chunk2 = chunk;\n\n          // There is no way to access the cloning code right now in the reference implementation.\n          // If we add one then we'll need an implementation for serializable objects.\n          // if (!canceled2 && cloneForBranch2) {\n          //   chunk2 = StructuredDeserialize(StructuredSerialize(chunk2));\n          // }\n\n          if (!canceled1) {\n            ReadableStreamDefaultControllerEnqueue(\n              branch1._readableStreamController as ReadableStreamDefaultController<R>,\n              chunk1\n            );\n          }\n          if (!canceled2) {\n            ReadableStreamDefaultControllerEnqueue(\n              branch2._readableStreamController as ReadableStreamDefaultController<R>,\n              chunk2\n            );\n          }\n\n          reading = false;\n          if (readAgain) {\n            pullAlgorithm();\n          }\n        });\n      },\n      _closeSteps: () => {\n        reading = false;\n        if (!canceled1) {\n          ReadableStreamDefaultControllerClose(branch1._readableStreamController as ReadableStreamDefaultController<R>);\n        }\n        if (!canceled2) {\n          ReadableStreamDefaultControllerClose(branch2._readableStreamController as ReadableStreamDefaultController<R>);\n        }\n\n        if (!canceled1 || !canceled2) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function cancel1Algorithm(reason: any): Promise<void> {\n    canceled1 = true;\n    reason1 = reason;\n    if (canceled2) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function cancel2Algorithm(reason: any): Promise<void> {\n    canceled2 = true;\n    reason2 = reason;\n    if (canceled1) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function startAlgorithm() {\n    // do nothing\n  }\n\n  branch1 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel1Algorithm);\n  branch2 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel2Algorithm);\n\n  uponRejection(reader._closedPromise, (r: any) => {\n    ReadableStreamDefaultControllerError(branch1._readableStreamController as ReadableStreamDefaultController<R>, r);\n    ReadableStreamDefaultControllerError(branch2._readableStreamController as ReadableStreamDefaultController<R>, r);\n    if (!canceled1 || !canceled2) {\n      resolveCancelPromise(undefined);\n    }\n  });\n\n  return [branch1, branch2];\n}\n\nexport function ReadableByteStreamTee(stream: ReadableByteStream): [ReadableByteStream, ReadableByteStream] {\n  assert(IsReadableStream(stream));\n  assert(IsReadableByteStreamController(stream._readableStreamController));\n\n  let reader: ReadableStreamReader<Uint8Array> = AcquireReadableStreamDefaultReader(stream);\n  let reading = false;\n  let readAgainForBranch1 = false;\n  let readAgainForBranch2 = false;\n  let canceled1 = false;\n  let canceled2 = false;\n  let reason1: any;\n  let reason2: any;\n  let branch1: ReadableByteStream;\n  let branch2: ReadableByteStream;\n\n  let resolveCancelPromise: (value: undefined | Promise<undefined>) => void;\n  const cancelPromise = newPromise<void>(resolve => {\n    resolveCancelPromise = resolve;\n  });\n\n  function forwardReaderError(thisReader: ReadableStreamReader<Uint8Array>) {\n    uponRejection(thisReader._closedPromise, r => {\n      if (thisReader !== reader) {\n        return;\n      }\n      ReadableByteStreamControllerError(branch1._readableStreamController, r);\n      ReadableByteStreamControllerError(branch2._readableStreamController, r);\n      if (!canceled1 || !canceled2) {\n        resolveCancelPromise(undefined);\n      }\n    });\n  }\n\n  function pullWithDefaultReader() {\n    if (IsReadableStreamBYOBReader(reader)) {\n      assert(reader._readIntoRequests.length === 0);\n      ReadableStreamReaderGenericRelease(reader);\n\n      reader = AcquireReadableStreamDefaultReader(stream);\n      forwardReaderError(reader);\n    }\n\n    const readRequest: ReadRequest<Uint8Array> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgainForBranch1 = false;\n          readAgainForBranch2 = false;\n\n          const chunk1 = chunk;\n          let chunk2 = chunk;\n          if (!canceled1 && !canceled2) {\n            try {\n              chunk2 = CloneAsUint8Array(chunk);\n            } catch (cloneE) {\n              ReadableByteStreamControllerError(branch1._readableStreamController, cloneE);\n              ReadableByteStreamControllerError(branch2._readableStreamController, cloneE);\n              resolveCancelPromise(ReadableStreamCancel(stream, cloneE));\n              return;\n            }\n          }\n\n          if (!canceled1) {\n            ReadableByteStreamControllerEnqueue(branch1._readableStreamController, chunk1);\n          }\n          if (!canceled2) {\n            ReadableByteStreamControllerEnqueue(branch2._readableStreamController, chunk2);\n          }\n\n          reading = false;\n          if (readAgainForBranch1) {\n            pull1Algorithm();\n          } else if (readAgainForBranch2) {\n            pull2Algorithm();\n          }\n        });\n      },\n      _closeSteps: () => {\n        reading = false;\n        if (!canceled1) {\n          ReadableByteStreamControllerClose(branch1._readableStreamController);\n        }\n        if (!canceled2) {\n          ReadableByteStreamControllerClose(branch2._readableStreamController);\n        }\n        if (branch1._readableStreamController._pendingPullIntos.length > 0) {\n          ReadableByteStreamControllerRespond(branch1._readableStreamController, 0);\n        }\n        if (branch2._readableStreamController._pendingPullIntos.length > 0) {\n          ReadableByteStreamControllerRespond(branch2._readableStreamController, 0);\n        }\n        if (!canceled1 || !canceled2) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n  }\n\n  function pullWithBYOBReader(view: ArrayBufferView, forBranch2: boolean) {\n    if (IsReadableStreamDefaultReader<Uint8Array>(reader)) {\n      assert(reader._readRequests.length === 0);\n      ReadableStreamReaderGenericRelease(reader);\n\n      reader = AcquireReadableStreamBYOBReader(stream);\n      forwardReaderError(reader);\n    }\n\n    const byobBranch = forBranch2 ? branch2 : branch1;\n    const otherBranch = forBranch2 ? branch1 : branch2;\n\n    const readIntoRequest: ReadIntoRequest<ArrayBufferView> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgainForBranch1 = false;\n          readAgainForBranch2 = false;\n\n          const byobCanceled = forBranch2 ? canceled2 : canceled1;\n          const otherCanceled = forBranch2 ? canceled1 : canceled2;\n\n          if (!otherCanceled) {\n            let clonedChunk;\n            try {\n              clonedChunk = CloneAsUint8Array(chunk);\n            } catch (cloneE) {\n              ReadableByteStreamControllerError(byobBranch._readableStreamController, cloneE);\n              ReadableByteStreamControllerError(otherBranch._readableStreamController, cloneE);\n              resolveCancelPromise(ReadableStreamCancel(stream, cloneE));\n              return;\n            }\n            if (!byobCanceled) {\n              ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n            }\n            ReadableByteStreamControllerEnqueue(otherBranch._readableStreamController, clonedChunk);\n          } else if (!byobCanceled) {\n            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n          }\n\n          reading = false;\n          if (readAgainForBranch1) {\n            pull1Algorithm();\n          } else if (readAgainForBranch2) {\n            pull2Algorithm();\n          }\n        });\n      },\n      _closeSteps: chunk => {\n        reading = false;\n\n        const byobCanceled = forBranch2 ? canceled2 : canceled1;\n        const otherCanceled = forBranch2 ? canceled1 : canceled2;\n\n        if (!byobCanceled) {\n          ReadableByteStreamControllerClose(byobBranch._readableStreamController);\n        }\n        if (!otherCanceled) {\n          ReadableByteStreamControllerClose(otherBranch._readableStreamController);\n        }\n\n        if (chunk !== undefined) {\n          assert(chunk.byteLength === 0);\n\n          if (!byobCanceled) {\n            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n          }\n          if (!otherCanceled && otherBranch._readableStreamController._pendingPullIntos.length > 0) {\n            ReadableByteStreamControllerRespond(otherBranch._readableStreamController, 0);\n          }\n        }\n\n        if (!byobCanceled || !otherCanceled) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamBYOBReaderRead(reader, view, readIntoRequest);\n  }\n\n  function pull1Algorithm(): Promise<void> {\n    if (reading) {\n      readAgainForBranch1 = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch1._readableStreamController);\n    if (byobRequest === null) {\n      pullWithDefaultReader();\n    } else {\n      pullWithBYOBReader(byobRequest._view!, false);\n    }\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function pull2Algorithm(): Promise<void> {\n    if (reading) {\n      readAgainForBranch2 = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch2._readableStreamController);\n    if (byobRequest === null) {\n      pullWithDefaultReader();\n    } else {\n      pullWithBYOBReader(byobRequest._view!, true);\n    }\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function cancel1Algorithm(reason: any): Promise<void> {\n    canceled1 = true;\n    reason1 = reason;\n    if (canceled2) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function cancel2Algorithm(reason: any): Promise<void> {\n    canceled2 = true;\n    reason2 = reason;\n    if (canceled1) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function startAlgorithm(): void {\n    return;\n  }\n\n  branch1 = CreateReadableByteStream(startAlgorithm, pull1Algorithm, cancel1Algorithm);\n  branch2 = CreateReadableByteStream(startAlgorithm, pull2Algorithm, cancel2Algorithm);\n\n  forwardReaderError(reader);\n\n  return [branch1, branch2];\n}\n","import { assertDictionary, assertFunction, convertUnsignedLongLongWithEnforceRange } from './basic';\nimport {\n  ReadableStreamController,\n  UnderlyingByteSource,\n  UnderlyingDefaultOrByteSource,\n  UnderlyingDefaultOrByteSourcePullCallback,\n  UnderlyingDefaultOrByteSourceStartCallback,\n  UnderlyingSource,\n  UnderlyingSourceCancelCallback,\n  ValidatedUnderlyingDefaultOrByteSource\n} from '../readable-stream/underlying-source';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\n\nexport function convertUnderlyingDefaultOrByteSource<R>(\n  source: UnderlyingSource<R> | UnderlyingByteSource | null,\n  context: string\n): ValidatedUnderlyingDefaultOrByteSource<R> {\n  assertDictionary(source, context);\n  const original = source as (UnderlyingDefaultOrByteSource<R> | null);\n  const autoAllocateChunkSize = original?.autoAllocateChunkSize;\n  const cancel = original?.cancel;\n  const pull = original?.pull;\n  const start = original?.start;\n  const type = original?.type;\n  return {\n    autoAllocateChunkSize: autoAllocateChunkSize === undefined ?\n      undefined :\n      convertUnsignedLongLongWithEnforceRange(\n        autoAllocateChunkSize,\n        `${context} has member 'autoAllocateChunkSize' that`\n      ),\n    cancel: cancel === undefined ?\n      undefined :\n      convertUnderlyingSourceCancelCallback(cancel, original!, `${context} has member 'cancel' that`),\n    pull: pull === undefined ?\n      undefined :\n      convertUnderlyingSourcePullCallback(pull, original!, `${context} has member 'pull' that`),\n    start: start === undefined ?\n      undefined :\n      convertUnderlyingSourceStartCallback(start, original!, `${context} has member 'start' that`),\n    type: type === undefined ? undefined : convertReadableStreamType(type, `${context} has member 'type' that`)\n  };\n}\n\nfunction convertUnderlyingSourceCancelCallback(\n  fn: UnderlyingSourceCancelCallback,\n  original: UnderlyingDefaultOrByteSource,\n  context: string\n): (reason: any) => Promise<void> {\n  assertFunction(fn, context);\n  return (reason: any) => promiseCall(fn, original, [reason]);\n}\n\nfunction convertUnderlyingSourcePullCallback<R>(\n  fn: UnderlyingDefaultOrByteSourcePullCallback<R>,\n  original: UnderlyingDefaultOrByteSource<R>,\n  context: string\n): (controller: ReadableStreamController<R>) => Promise<void> {\n  assertFunction(fn, context);\n  return (controller: ReadableStreamController<R>) => promiseCall(fn, original, [controller]);\n}\n\nfunction convertUnderlyingSourceStartCallback<R>(\n  fn: UnderlyingDefaultOrByteSourceStartCallback<R>,\n  original: UnderlyingDefaultOrByteSource<R>,\n  context: string\n): UnderlyingDefaultOrByteSourceStartCallback<R> {\n  assertFunction(fn, context);\n  return (controller: ReadableStreamController<R>) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertReadableStreamType(type: string, context: string): 'bytes' {\n  type = `${type}`;\n  if (type !== 'bytes') {\n    throw new TypeError(`${context} '${type}' is not a valid enumeration value for ReadableStreamType`);\n  }\n  return type;\n}\n","import { assertDictionary } from './basic';\nimport { ReadableStreamGetReaderOptions } from '../readable-stream/reader-options';\n\nexport function convertReaderOptions(options: ReadableStreamGetReaderOptions | null | undefined,\n                                     context: string): ReadableStreamGetReaderOptions {\n  assertDictionary(options, context);\n  const mode = options?.mode;\n  return {\n    mode: mode === undefined ? undefined : convertReadableStreamReaderMode(mode, `${context} has member 'mode' that`)\n  };\n}\n\nfunction convertReadableStreamReaderMode(mode: string, context: string): 'byob' {\n  mode = `${mode}`;\n  if (mode !== 'byob') {\n    throw new TypeError(`${context} '${mode}' is not a valid enumeration value for ReadableStreamReaderMode`);\n  }\n  return mode;\n}\n","import { assertDictionary } from './basic';\nimport {\n  ReadableStreamIteratorOptions,\n  ValidatedReadableStreamIteratorOptions\n} from '../readable-stream/iterator-options';\n\nexport function convertIteratorOptions(options: ReadableStreamIteratorOptions | null | undefined,\n                                       context: string): ValidatedReadableStreamIteratorOptions {\n  assertDictionary(options, context);\n  const preventCancel = options?.preventCancel;\n  return { preventCancel: Boolean(preventCancel) };\n}\n","import { assertDictionary } from './basic';\nimport { StreamPipeOptions, ValidatedStreamPipeOptions } from '../readable-stream/pipe-options';\nimport { AbortSignal, isAbortSignal } from '../abort-signal';\n\nexport function convertPipeOptions(options: StreamPipeOptions | null | undefined,\n                                   context: string): ValidatedStreamPipeOptions {\n  assertDictionary(options, context);\n  const preventAbort = options?.preventAbort;\n  const preventCancel = options?.preventCancel;\n  const preventClose = options?.preventClose;\n  const signal = options?.signal;\n  if (signal !== undefined) {\n    assertAbortSignal(signal, `${context} has member 'signal' that`);\n  }\n  return {\n    preventAbort: Boolean(preventAbort),\n    preventCancel: Boolean(preventCancel),\n    preventClose: Boolean(preventClose),\n    signal\n  };\n}\n\nfunction assertAbortSignal(signal: unknown, context: string): asserts signal is AbortSignal {\n  if (!isAbortSignal(signal)) {\n    throw new TypeError(`${context} is not an AbortSignal.`);\n  }\n}\n","import { assertDictionary, assertRequiredField } from './basic';\nimport { ReadableStream } from '../readable-stream';\nimport { WritableStream } from '../writable-stream';\nimport { assertReadableStream } from './readable-stream';\nimport { assertWritableStream } from './writable-stream';\n\nexport function convertReadableWritablePair<RS extends ReadableStream, WS extends WritableStream>(\n  pair: { readable: RS; writable: WS } | null | undefined,\n  context: string\n): { readable: RS; writable: WS } {\n  assertDictionary(pair, context);\n\n  const readable = pair?.readable;\n  assertRequiredField(readable, 'readable', 'ReadableWritablePair');\n  assertReadableStream(readable, `${context} has member 'readable' that`);\n\n  const writable = pair?.writable;\n  assertRequiredField(writable, 'writable', 'ReadableWritablePair');\n  assertWritableStream(writable, `${context} has member 'writable' that`);\n\n  return { readable, writable };\n}\n","import assert from '../stub/assert';\nimport {\n  promiseRejectedWith,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  transformPromiseWith\n} from './helpers/webidl';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { AcquireReadableStreamAsyncIterator, ReadableStreamAsyncIterator } from './readable-stream/async-iterator';\nimport { defaultReaderClosedPromiseReject, defaultReaderClosedPromiseResolve } from './readable-stream/generic-reader';\nimport {\n  AcquireReadableStreamDefaultReader,\n  IsReadableStreamDefaultReader,\n  ReadableStreamDefaultReader,\n  ReadableStreamDefaultReadResult\n} from './readable-stream/default-reader';\nimport {\n  AcquireReadableStreamBYOBReader,\n  IsReadableStreamBYOBReader,\n  ReadableStreamBYOBReader,\n  ReadableStreamBYOBReadResult\n} from './readable-stream/byob-reader';\nimport { ReadableStreamPipeTo } from './readable-stream/pipe';\nimport { ReadableStreamTee } from './readable-stream/tee';\nimport { IsWritableStream, IsWritableStreamLocked, WritableStream } from './writable-stream';\nimport { SimpleQueue } from './simple-queue';\nimport {\n  ReadableByteStreamController,\n  ReadableStreamBYOBRequest,\n  SetUpReadableByteStreamController,\n  SetUpReadableByteStreamControllerFromUnderlyingSource\n} from './readable-stream/byte-stream-controller';\nimport {\n  ReadableStreamDefaultController,\n  SetUpReadableStreamDefaultController,\n  SetUpReadableStreamDefaultControllerFromUnderlyingSource\n} from './readable-stream/default-controller';\nimport {\n  UnderlyingByteSource,\n  UnderlyingByteSourcePullCallback,\n  UnderlyingByteSourceStartCallback,\n  UnderlyingSource,\n  UnderlyingSourceCancelCallback,\n  UnderlyingSourcePullCallback,\n  UnderlyingSourceStartCallback\n} from './readable-stream/underlying-source';\nimport { noop } from '../utils';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { CreateArrayFromList } from './abstract-ops/ecmascript';\nimport { CancelSteps } from './abstract-ops/internal-methods';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { assertObject, assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport { convertUnderlyingDefaultOrByteSource } from './validators/underlying-source';\nimport { ReadableStreamGetReaderOptions } from './readable-stream/reader-options';\nimport { convertReaderOptions } from './validators/reader-options';\nimport { StreamPipeOptions, ValidatedStreamPipeOptions } from './readable-stream/pipe-options';\nimport { ReadableStreamIteratorOptions } from './readable-stream/iterator-options';\nimport { convertIteratorOptions } from './validators/iterator-options';\nimport { convertPipeOptions } from './validators/pipe-options';\nimport { ReadableWritablePair } from './readable-stream/readable-writable-pair';\nimport { convertReadableWritablePair } from './validators/readable-writable-pair';\n\nexport type ReadableByteStream = ReadableStream<Uint8Array> & {\n  _readableStreamController: ReadableByteStreamController\n};\n\ntype ReadableStreamState = 'readable' | 'closed' | 'errored';\n\n/**\n * A readable stream represents a source of data, from which you can read.\n *\n * @public\n */\nexport class ReadableStream<R = any> {\n  /** @internal */\n  _state!: ReadableStreamState;\n  /** @internal */\n  _reader: ReadableStreamReader<R> | undefined;\n  /** @internal */\n  _storedError: any;\n  /** @internal */\n  _disturbed!: boolean;\n  /** @internal */\n  _readableStreamController!: ReadableStreamDefaultController<R> | ReadableByteStreamController;\n\n  constructor(underlyingSource: UnderlyingByteSource, strategy?: { highWaterMark?: number; size?: undefined });\n  constructor(underlyingSource?: UnderlyingSource<R>, strategy?: QueuingStrategy<R>);\n  constructor(rawUnderlyingSource: UnderlyingSource<R> | UnderlyingByteSource | null | undefined = {},\n              rawStrategy: QueuingStrategy<R> | null | undefined = {}) {\n    if (rawUnderlyingSource === undefined) {\n      rawUnderlyingSource = null;\n    } else {\n      assertObject(rawUnderlyingSource, 'First parameter');\n    }\n\n    const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');\n    const underlyingSource = convertUnderlyingDefaultOrByteSource(rawUnderlyingSource, 'First parameter');\n\n    InitializeReadableStream(this);\n\n    if (underlyingSource.type === 'bytes') {\n      if (strategy.size !== undefined) {\n        throw new RangeError('The strategy for a byte stream cannot have a size function');\n      }\n      const highWaterMark = ExtractHighWaterMark(strategy, 0);\n      SetUpReadableByteStreamControllerFromUnderlyingSource(\n        this as unknown as ReadableByteStream,\n        underlyingSource,\n        highWaterMark\n      );\n    } else {\n      assert(underlyingSource.type === undefined);\n      const sizeAlgorithm = ExtractSizeAlgorithm(strategy);\n      const highWaterMark = ExtractHighWaterMark(strategy, 1);\n      SetUpReadableStreamDefaultControllerFromUnderlyingSource(\n        this,\n        underlyingSource,\n        highWaterMark,\n        sizeAlgorithm\n      );\n    }\n  }\n\n  /**\n   * Whether or not the readable stream is locked to a {@link ReadableStreamDefaultReader | reader}.\n   */\n  get locked(): boolean {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('locked');\n    }\n\n    return IsReadableStreamLocked(this);\n  }\n\n  /**\n   * Cancels the stream, signaling a loss of interest in the stream by a consumer.\n   *\n   * The supplied `reason` argument will be given to the underlying source's {@link UnderlyingSource.cancel | cancel()}\n   * method, which might or might not use it.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('cancel'));\n    }\n\n    if (IsReadableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot cancel a stream that already has a reader'));\n    }\n\n    return ReadableStreamCancel(this, reason);\n  }\n\n  /**\n   * Creates a {@link ReadableStreamBYOBReader} and locks the stream to the new reader.\n   *\n   * This call behaves the same way as the no-argument variant, except that it only works on readable byte streams,\n   * i.e. streams which were constructed specifically with the ability to handle \"bring your own buffer\" reading.\n   * The returned BYOB reader provides the ability to directly read individual chunks from the stream via its\n   * {@link ReadableStreamBYOBReader.read | read()} method, into developer-supplied buffers, allowing more precise\n   * control over allocation.\n   */\n  getReader({ mode }: { mode: 'byob' }): ReadableStreamBYOBReader;\n  /**\n   * Creates a {@link ReadableStreamDefaultReader} and locks the stream to the new reader.\n   * While the stream is locked, no other reader can be acquired until this one is released.\n   *\n   * This functionality is especially useful for creating abstractions that desire the ability to consume a stream\n   * in its entirety. By getting a reader for the stream, you can ensure nobody else can interleave reads with yours\n   * or cancel the stream, which would interfere with your abstraction.\n   */\n  getReader(): ReadableStreamDefaultReader<R>;\n  getReader(\n    rawOptions: ReadableStreamGetReaderOptions | null | undefined = undefined\n  ): ReadableStreamDefaultReader<R> | ReadableStreamBYOBReader {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('getReader');\n    }\n\n    const options = convertReaderOptions(rawOptions, 'First parameter');\n\n    if (options.mode === undefined) {\n      return AcquireReadableStreamDefaultReader(this);\n    }\n\n    assert(options.mode === 'byob');\n    return AcquireReadableStreamBYOBReader(this as unknown as ReadableByteStream);\n  }\n\n  /**\n   * Provides a convenient, chainable way of piping this readable stream through a transform stream\n   * (or any other `{ writable, readable }` pair). It simply {@link ReadableStream.pipeTo | pipes} the stream\n   * into the writable side of the supplied pair, and returns the readable side for further use.\n   *\n   * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.\n   */\n  pipeThrough<RS extends ReadableStream>(\n    transform: { readable: RS; writable: WritableStream<R> },\n    options?: StreamPipeOptions\n  ): RS;\n  pipeThrough<RS extends ReadableStream>(\n    rawTransform: { readable: RS; writable: WritableStream<R> } | null | undefined,\n    rawOptions: StreamPipeOptions | null | undefined = {}\n  ): RS {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('pipeThrough');\n    }\n    assertRequiredArgument(rawTransform, 1, 'pipeThrough');\n\n    const transform = convertReadableWritablePair(rawTransform, 'First parameter');\n    const options = convertPipeOptions(rawOptions, 'Second parameter');\n\n    if (IsReadableStreamLocked(this)) {\n      throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked ReadableStream');\n    }\n    if (IsWritableStreamLocked(transform.writable)) {\n      throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked WritableStream');\n    }\n\n    const promise = ReadableStreamPipeTo(\n      this, transform.writable, options.preventClose, options.preventAbort, options.preventCancel, options.signal\n    );\n\n    setPromiseIsHandledToTrue(promise);\n\n    return transform.readable;\n  }\n\n  /**\n   * Pipes this readable stream to a given writable stream. The way in which the piping process behaves under\n   * various error conditions can be customized with a number of passed options. It returns a promise that fulfills\n   * when the piping process completes successfully, or rejects if any errors were encountered.\n   *\n   * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.\n   */\n  pipeTo(destination: WritableStream<R>, options?: StreamPipeOptions): Promise<void>;\n  pipeTo(destination: WritableStream<R> | null | undefined,\n         rawOptions: StreamPipeOptions | null | undefined = {}): Promise<void> {\n    if (!IsReadableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('pipeTo'));\n    }\n\n    if (destination === undefined) {\n      return promiseRejectedWith(`Parameter 1 is required in 'pipeTo'.`);\n    }\n    if (!IsWritableStream(destination)) {\n      return promiseRejectedWith(\n        new TypeError(`ReadableStream.prototype.pipeTo's first argument must be a WritableStream`)\n      );\n    }\n\n    let options: ValidatedStreamPipeOptions;\n    try {\n      options = convertPipeOptions(rawOptions, 'Second parameter');\n    } catch (e) {\n      return promiseRejectedWith(e);\n    }\n\n    if (IsReadableStreamLocked(this)) {\n      return promiseRejectedWith(\n        new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream')\n      );\n    }\n    if (IsWritableStreamLocked(destination)) {\n      return promiseRejectedWith(\n        new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream')\n      );\n    }\n\n    return ReadableStreamPipeTo<R>(\n      this, destination, options.preventClose, options.preventAbort, options.preventCancel, options.signal\n    );\n  }\n\n  /**\n   * Tees this readable stream, returning a two-element array containing the two resulting branches as\n   * new {@link ReadableStream} instances.\n   *\n   * Teeing a stream will lock it, preventing any other consumer from acquiring a reader.\n   * To cancel the stream, cancel both of the resulting branches; a composite cancellation reason will then be\n   * propagated to the stream's underlying source.\n   *\n   * Note that the chunks seen in each branch will be the same object. If the chunks are not immutable,\n   * this could allow interference between the two branches.\n   */\n  tee(): [ReadableStream<R>, ReadableStream<R>] {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('tee');\n    }\n\n    const branches = ReadableStreamTee(this, false);\n    return CreateArrayFromList(branches);\n  }\n\n  /**\n   * Asynchronously iterates over the chunks in the stream's internal queue.\n   *\n   * Asynchronously iterating over the stream will lock it, preventing any other consumer from acquiring a reader.\n   * The lock will be released if the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method\n   * is called, e.g. by breaking out of the loop.\n   *\n   * By default, calling the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method will also\n   * cancel the stream. To prevent this, use the stream's {@link ReadableStream.values | values()} method, passing\n   * `true` for the `preventCancel` option.\n   */\n  values(options?: ReadableStreamIteratorOptions): ReadableStreamAsyncIterator<R>;\n  values(rawOptions: ReadableStreamIteratorOptions | null | undefined = undefined): ReadableStreamAsyncIterator<R> {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('values');\n    }\n\n    const options = convertIteratorOptions(rawOptions, 'First parameter');\n    return AcquireReadableStreamAsyncIterator<R>(this, options.preventCancel);\n  }\n\n  /**\n   * {@inheritDoc ReadableStream.values}\n   */\n  [Symbol.asyncIterator]: (options?: ReadableStreamIteratorOptions) => ReadableStreamAsyncIterator<R>;\n}\n\nObject.defineProperties(ReadableStream.prototype, {\n  cancel: { enumerable: true },\n  getReader: { enumerable: true },\n  pipeThrough: { enumerable: true },\n  pipeTo: { enumerable: true },\n  tee: { enumerable: true },\n  values: { enumerable: true },\n  locked: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStream.prototype, Symbol.toStringTag, {\n    value: 'ReadableStream',\n    configurable: true\n  });\n}\nif (typeof Symbol.asyncIterator === 'symbol') {\n  Object.defineProperty(ReadableStream.prototype, Symbol.asyncIterator, {\n    value: ReadableStream.prototype.values,\n    writable: true,\n    configurable: true\n  });\n}\n\nexport {\n  ReadableStreamAsyncIterator,\n  ReadableStreamDefaultReadResult,\n  ReadableStreamBYOBReadResult,\n  UnderlyingByteSource,\n  UnderlyingSource,\n  UnderlyingSourceStartCallback,\n  UnderlyingSourcePullCallback,\n  UnderlyingSourceCancelCallback,\n  UnderlyingByteSourceStartCallback,\n  UnderlyingByteSourcePullCallback,\n  StreamPipeOptions,\n  ReadableWritablePair,\n  ReadableStreamIteratorOptions\n};\n\n// Abstract operations for the ReadableStream.\n\n// Throws if and only if startAlgorithm throws.\nexport function CreateReadableStream<R>(startAlgorithm: () => void | PromiseLike<void>,\n                                        pullAlgorithm: () => Promise<void>,\n                                        cancelAlgorithm: (reason: any) => Promise<void>,\n                                        highWaterMark = 1,\n                                        sizeAlgorithm: QueuingStrategySizeCallback<R> = () => 1): ReadableStream<R> {\n  assert(IsNonNegativeNumber(highWaterMark));\n\n  const stream: ReadableStream<R> = Object.create(ReadableStream.prototype);\n  InitializeReadableStream(stream);\n\n  const controller: ReadableStreamDefaultController<R> = Object.create(ReadableStreamDefaultController.prototype);\n  SetUpReadableStreamDefaultController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm\n  );\n\n  return stream;\n}\n\n// Throws if and only if startAlgorithm throws.\nexport function CreateReadableByteStream(\n  startAlgorithm: () => void | PromiseLike<void>,\n  pullAlgorithm: () => Promise<void>,\n  cancelAlgorithm: (reason: any) => Promise<void>\n): ReadableByteStream {\n  const stream: ReadableByteStream = Object.create(ReadableStream.prototype);\n  InitializeReadableStream(stream);\n\n  const controller: ReadableByteStreamController = Object.create(ReadableByteStreamController.prototype);\n  SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, 0, undefined);\n\n  return stream;\n}\n\nfunction InitializeReadableStream(stream: ReadableStream) {\n  stream._state = 'readable';\n  stream._reader = undefined;\n  stream._storedError = undefined;\n  stream._disturbed = false;\n}\n\nexport function IsReadableStream(x: unknown): x is ReadableStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readableStreamController')) {\n    return false;\n  }\n\n  return x instanceof ReadableStream;\n}\n\nexport function IsReadableStreamDisturbed(stream: ReadableStream): boolean {\n  assert(IsReadableStream(stream));\n\n  return stream._disturbed;\n}\n\nexport function IsReadableStreamLocked(stream: ReadableStream): boolean {\n  assert(IsReadableStream(stream));\n\n  if (stream._reader === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamCancel<R>(stream: ReadableStream<R>, reason: any): Promise<undefined> {\n  stream._disturbed = true;\n\n  if (stream._state === 'closed') {\n    return promiseResolvedWith(undefined);\n  }\n  if (stream._state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  ReadableStreamClose(stream);\n\n  const reader = stream._reader;\n  if (reader !== undefined && IsReadableStreamBYOBReader(reader)) {\n    reader._readIntoRequests.forEach(readIntoRequest => {\n      readIntoRequest._closeSteps(undefined);\n    });\n    reader._readIntoRequests = new SimpleQueue();\n  }\n\n  const sourceCancelPromise = stream._readableStreamController[CancelSteps](reason);\n  return transformPromiseWith(sourceCancelPromise, noop);\n}\n\nexport function ReadableStreamClose<R>(stream: ReadableStream<R>): void {\n  assert(stream._state === 'readable');\n\n  stream._state = 'closed';\n\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return;\n  }\n\n  defaultReaderClosedPromiseResolve(reader);\n\n  if (IsReadableStreamDefaultReader<R>(reader)) {\n    reader._readRequests.forEach(readRequest => {\n      readRequest._closeSteps();\n    });\n    reader._readRequests = new SimpleQueue();\n  }\n}\n\nexport function ReadableStreamError<R>(stream: ReadableStream<R>, e: any): void {\n  assert(IsReadableStream(stream));\n  assert(stream._state === 'readable');\n\n  stream._state = 'errored';\n  stream._storedError = e;\n\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return;\n  }\n\n  defaultReaderClosedPromiseReject(reader, e);\n\n  if (IsReadableStreamDefaultReader<R>(reader)) {\n    reader._readRequests.forEach(readRequest => {\n      readRequest._errorSteps(e);\n    });\n\n    reader._readRequests = new SimpleQueue();\n  } else {\n    assert(IsReadableStreamBYOBReader(reader));\n\n    reader._readIntoRequests.forEach(readIntoRequest => {\n      readIntoRequest._errorSteps(e);\n    });\n\n    reader._readIntoRequests = new SimpleQueue();\n  }\n}\n\n// Readers\n\nexport type ReadableStreamReader<R> = ReadableStreamDefaultReader<R> | ReadableStreamBYOBReader;\n\nexport {\n  ReadableStreamDefaultReader,\n  ReadableStreamBYOBReader\n};\n\n// Controllers\n\nexport {\n  ReadableStreamDefaultController,\n  ReadableStreamBYOBRequest,\n  ReadableByteStreamController\n};\n\n// Helper functions for the ReadableStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(`ReadableStream.prototype.${name} can only be used on a ReadableStream`);\n}\n","import { QueuingStrategyInit } from '../queuing-strategy';\nimport { assertDictionary, assertRequiredField, convertUnrestrictedDouble } from './basic';\n\nexport function convertQueuingStrategyInit(init: QueuingStrategyInit | null | undefined,\n                                           context: string): QueuingStrategyInit {\n  assertDictionary(init, context);\n  const highWaterMark = init?.highWaterMark;\n  assertRequiredField(highWaterMark, 'highWaterMark', 'QueuingStrategyInit');\n  return {\n    highWaterMark: convertUnrestrictedDouble(highWaterMark)\n  };\n}\n","import { QueuingStrategy, QueuingStrategyInit } from './queuing-strategy';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategyInit } from './validators/queuing-strategy-init';\n\n// The size function must not have a prototype property nor be a constructor\nconst byteLengthSizeFunction = (chunk: ArrayBufferView): number => {\n  return chunk.byteLength;\n};\ntry {\n  Object.defineProperty(byteLengthSizeFunction, 'name', {\n    value: 'size',\n    configurable: true\n  });\n} catch {\n  // This property is non-configurable in older browsers, so ignore if this throws.\n  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility\n}\n\n/**\n * A queuing strategy that counts the number of bytes in each chunk.\n *\n * @public\n */\nexport default class ByteLengthQueuingStrategy implements QueuingStrategy<ArrayBufferView> {\n  /** @internal */\n  readonly _byteLengthQueuingStrategyHighWaterMark: number;\n\n  constructor(options: QueuingStrategyInit) {\n    assertRequiredArgument(options, 1, 'ByteLengthQueuingStrategy');\n    options = convertQueuingStrategyInit(options, 'First parameter');\n    this._byteLengthQueuingStrategyHighWaterMark = options.highWaterMark;\n  }\n\n  /**\n   * Returns the high water mark provided to the constructor.\n   */\n  get highWaterMark(): number {\n    if (!IsByteLengthQueuingStrategy(this)) {\n      throw byteLengthBrandCheckException('highWaterMark');\n    }\n    return this._byteLengthQueuingStrategyHighWaterMark;\n  }\n\n  /**\n   * Measures the size of `chunk` by returning the value of its `byteLength` property.\n   */\n  get size(): (chunk: ArrayBufferView) => number {\n    if (!IsByteLengthQueuingStrategy(this)) {\n      throw byteLengthBrandCheckException('size');\n    }\n    return byteLengthSizeFunction;\n  }\n}\n\nObject.defineProperties(ByteLengthQueuingStrategy.prototype, {\n  highWaterMark: { enumerable: true },\n  size: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ByteLengthQueuingStrategy.prototype, Symbol.toStringTag, {\n    value: 'ByteLengthQueuingStrategy',\n    configurable: true\n  });\n}\n\n// Helper functions for the ByteLengthQueuingStrategy.\n\nfunction byteLengthBrandCheckException(name: string): TypeError {\n  return new TypeError(`ByteLengthQueuingStrategy.prototype.${name} can only be used on a ByteLengthQueuingStrategy`);\n}\n\nexport function IsByteLengthQueuingStrategy(x: any): x is ByteLengthQueuingStrategy {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_byteLengthQueuingStrategyHighWaterMark')) {\n    return false;\n  }\n\n  return x instanceof ByteLengthQueuingStrategy;\n}\n","import { QueuingStrategy, QueuingStrategyInit } from './queuing-strategy';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategyInit } from './validators/queuing-strategy-init';\n\n// The size function must not have a prototype property nor be a constructor\nconst countSizeFunction = (): 1 => {\n  return 1;\n};\ntry {\n  Object.defineProperty(countSizeFunction, 'name', {\n    value: 'size',\n    configurable: true\n  });\n} catch {\n  // This property is non-configurable in older browsers, so ignore if this throws.\n  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility\n}\n\n/**\n * A queuing strategy that counts the number of chunks.\n *\n * @public\n */\nexport default class CountQueuingStrategy implements QueuingStrategy<any> {\n  /** @internal */\n  readonly _countQueuingStrategyHighWaterMark!: number;\n\n  constructor(options: QueuingStrategyInit) {\n    assertRequiredArgument(options, 1, 'CountQueuingStrategy');\n    options = convertQueuingStrategyInit(options, 'First parameter');\n    this._countQueuingStrategyHighWaterMark = options.highWaterMark;\n  }\n\n  /**\n   * Returns the high water mark provided to the constructor.\n   */\n  get highWaterMark(): number {\n    if (!IsCountQueuingStrategy(this)) {\n      throw countBrandCheckException('highWaterMark');\n    }\n    return this._countQueuingStrategyHighWaterMark;\n  }\n\n  /**\n   * Measures the size of `chunk` by always returning 1.\n   * This ensures that the total queue size is a count of the number of chunks in the queue.\n   */\n  get size(): (chunk: any) => 1 {\n    if (!IsCountQueuingStrategy(this)) {\n      throw countBrandCheckException('size');\n    }\n    return countSizeFunction;\n  }\n}\n\nObject.defineProperties(CountQueuingStrategy.prototype, {\n  highWaterMark: { enumerable: true },\n  size: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(CountQueuingStrategy.prototype, Symbol.toStringTag, {\n    value: 'CountQueuingStrategy',\n    configurable: true\n  });\n}\n\n// Helper functions for the CountQueuingStrategy.\n\nfunction countBrandCheckException(name: string): TypeError {\n  return new TypeError(`CountQueuingStrategy.prototype.${name} can only be used on a CountQueuingStrategy`);\n}\n\nexport function IsCountQueuingStrategy(x: any): x is CountQueuingStrategy {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_countQueuingStrategyHighWaterMark')) {\n    return false;\n  }\n\n  return x instanceof CountQueuingStrategy;\n}\n","import { assertDictionary, assertFunction } from './basic';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\nimport {\n  Transformer,\n  TransformerFlushCallback,\n  TransformerStartCallback,\n  TransformerTransformCallback,\n  ValidatedTransformer\n} from '../transform-stream/transformer';\nimport { TransformStreamDefaultController } from '../transform-stream';\n\nexport function convertTransformer<I, O>(original: Transformer<I, O> | null,\n                                         context: string): ValidatedTransformer<I, O> {\n  assertDictionary(original, context);\n  const flush = original?.flush;\n  const readableType = original?.readableType;\n  const start = original?.start;\n  const transform = original?.transform;\n  const writableType = original?.writableType;\n  return {\n    flush: flush === undefined ?\n      undefined :\n      convertTransformerFlushCallback(flush, original!, `${context} has member 'flush' that`),\n    readableType,\n    start: start === undefined ?\n      undefined :\n      convertTransformerStartCallback(start, original!, `${context} has member 'start' that`),\n    transform: transform === undefined ?\n      undefined :\n      convertTransformerTransformCallback(transform, original!, `${context} has member 'transform' that`),\n    writableType\n  };\n}\n\nfunction convertTransformerFlushCallback<I, O>(\n  fn: TransformerFlushCallback<O>,\n  original: Transformer<I, O>,\n  context: string\n): (controller: TransformStreamDefaultController<O>) => Promise<void> {\n  assertFunction(fn, context);\n  return (controller: TransformStreamDefaultController<O>) => promiseCall(fn, original, [controller]);\n}\n\nfunction convertTransformerStartCallback<I, O>(\n  fn: TransformerStartCallback<O>,\n  original: Transformer<I, O>,\n  context: string\n): TransformerStartCallback<O> {\n  assertFunction(fn, context);\n  return (controller: TransformStreamDefaultController<O>) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertTransformerTransformCallback<I, O>(\n  fn: TransformerTransformCallback<I, O>,\n  original: Transformer<I, O>,\n  context: string\n): (chunk: I, controller: TransformStreamDefaultController<O>) => Promise<void> {\n  assertFunction(fn, context);\n  return (chunk: I, controller: TransformStreamDefaultController<O>) => promiseCall(fn, original, [chunk, controller]);\n}\n","import assert from '../stub/assert';\nimport { newPromise, promiseRejectedWith, promiseResolvedWith, transformPromiseWith } from './helpers/webidl';\nimport { CreateReadableStream, ReadableStream, ReadableStreamDefaultController } from './readable-stream';\nimport {\n  ReadableStreamDefaultControllerCanCloseOrEnqueue,\n  ReadableStreamDefaultControllerClose,\n  ReadableStreamDefaultControllerEnqueue,\n  ReadableStreamDefaultControllerError,\n  ReadableStreamDefaultControllerGetDesiredSize,\n  ReadableStreamDefaultControllerHasBackpressure\n} from './readable-stream/default-controller';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { CreateWritableStream, WritableStream, WritableStreamDefaultControllerErrorIfNeeded } from './writable-stream';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport {\n  Transformer,\n  TransformerFlushCallback,\n  TransformerStartCallback,\n  TransformerTransformCallback,\n  ValidatedTransformer\n} from './transform-stream/transformer';\nimport { convertTransformer } from './validators/transformer';\n\n// Class TransformStream\n\n/**\n * A transform stream consists of a pair of streams: a {@link WritableStream | writable stream},\n * known as its writable side, and a {@link ReadableStream | readable stream}, known as its readable side.\n * In a manner specific to the transform stream in question, writes to the writable side result in new data being\n * made available for reading from the readable side.\n *\n * @public\n */\nexport class TransformStream<I = any, O = any> {\n  /** @internal */\n  _writable!: WritableStream<I>;\n  /** @internal */\n  _readable!: ReadableStream<O>;\n  /** @internal */\n  _backpressure!: boolean;\n  /** @internal */\n  _backpressureChangePromise!: Promise<void>;\n  /** @internal */\n  _backpressureChangePromise_resolve!: () => void;\n  /** @internal */\n  _transformStreamController!: TransformStreamDefaultController<O>;\n\n  constructor(\n    transformer?: Transformer<I, O>,\n    writableStrategy?: QueuingStrategy<I>,\n    readableStrategy?: QueuingStrategy<O>\n  );\n  constructor(rawTransformer: Transformer<I, O> | null | undefined = {},\n              rawWritableStrategy: QueuingStrategy<I> | null | undefined = {},\n              rawReadableStrategy: QueuingStrategy<O> | null | undefined = {}) {\n    if (rawTransformer === undefined) {\n      rawTransformer = null;\n    }\n\n    const writableStrategy = convertQueuingStrategy(rawWritableStrategy, 'Second parameter');\n    const readableStrategy = convertQueuingStrategy(rawReadableStrategy, 'Third parameter');\n\n    const transformer = convertTransformer(rawTransformer, 'First parameter');\n    if (transformer.readableType !== undefined) {\n      throw new RangeError('Invalid readableType specified');\n    }\n    if (transformer.writableType !== undefined) {\n      throw new RangeError('Invalid writableType specified');\n    }\n\n    const readableHighWaterMark = ExtractHighWaterMark(readableStrategy, 0);\n    const readableSizeAlgorithm = ExtractSizeAlgorithm(readableStrategy);\n    const writableHighWaterMark = ExtractHighWaterMark(writableStrategy, 1);\n    const writableSizeAlgorithm = ExtractSizeAlgorithm(writableStrategy);\n\n    let startPromise_resolve!: (value: void | PromiseLike<void>) => void;\n    const startPromise = newPromise<void>(resolve => {\n      startPromise_resolve = resolve;\n    });\n\n    InitializeTransformStream(\n      this, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm\n    );\n    SetUpTransformStreamDefaultControllerFromTransformer(this, transformer);\n\n    if (transformer.start !== undefined) {\n      startPromise_resolve(transformer.start(this._transformStreamController));\n    } else {\n      startPromise_resolve(undefined);\n    }\n  }\n\n  /**\n   * The readable side of the transform stream.\n   */\n  get readable(): ReadableStream<O> {\n    if (!IsTransformStream(this)) {\n      throw streamBrandCheckException('readable');\n    }\n\n    return this._readable;\n  }\n\n  /**\n   * The writable side of the transform stream.\n   */\n  get writable(): WritableStream<I> {\n    if (!IsTransformStream(this)) {\n      throw streamBrandCheckException('writable');\n    }\n\n    return this._writable;\n  }\n}\n\nObject.defineProperties(TransformStream.prototype, {\n  readable: { enumerable: true },\n  writable: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(TransformStream.prototype, Symbol.toStringTag, {\n    value: 'TransformStream',\n    configurable: true\n  });\n}\n\nexport {\n  Transformer,\n  TransformerStartCallback,\n  TransformerFlushCallback,\n  TransformerTransformCallback\n};\n\n// Transform Stream Abstract Operations\n\nexport function CreateTransformStream<I, O>(startAlgorithm: () => void | PromiseLike<void>,\n                                            transformAlgorithm: (chunk: I) => Promise<void>,\n                                            flushAlgorithm: () => Promise<void>,\n                                            writableHighWaterMark = 1,\n                                            writableSizeAlgorithm: QueuingStrategySizeCallback<I> = () => 1,\n                                            readableHighWaterMark = 0,\n                                            readableSizeAlgorithm: QueuingStrategySizeCallback<O> = () => 1) {\n  assert(IsNonNegativeNumber(writableHighWaterMark));\n  assert(IsNonNegativeNumber(readableHighWaterMark));\n\n  const stream: TransformStream<I, O> = Object.create(TransformStream.prototype);\n\n  let startPromise_resolve!: (value: void | PromiseLike<void>) => void;\n  const startPromise = newPromise<void>(resolve => {\n    startPromise_resolve = resolve;\n  });\n\n  InitializeTransformStream(stream, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark,\n                            readableSizeAlgorithm);\n\n  const controller: TransformStreamDefaultController<O> = Object.create(TransformStreamDefaultController.prototype);\n\n  SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);\n\n  const startResult = startAlgorithm();\n  startPromise_resolve(startResult);\n  return stream;\n}\n\nfunction InitializeTransformStream<I, O>(stream: TransformStream<I, O>,\n                                         startPromise: Promise<void>,\n                                         writableHighWaterMark: number,\n                                         writableSizeAlgorithm: QueuingStrategySizeCallback<I>,\n                                         readableHighWaterMark: number,\n                                         readableSizeAlgorithm: QueuingStrategySizeCallback<O>) {\n  function startAlgorithm(): Promise<void> {\n    return startPromise;\n  }\n\n  function writeAlgorithm(chunk: I): Promise<void> {\n    return TransformStreamDefaultSinkWriteAlgorithm(stream, chunk);\n  }\n\n  function abortAlgorithm(reason: any): Promise<void> {\n    return TransformStreamDefaultSinkAbortAlgorithm(stream, reason);\n  }\n\n  function closeAlgorithm(): Promise<void> {\n    return TransformStreamDefaultSinkCloseAlgorithm(stream);\n  }\n\n  stream._writable = CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm,\n                                          writableHighWaterMark, writableSizeAlgorithm);\n\n  function pullAlgorithm(): Promise<void> {\n    return TransformStreamDefaultSourcePullAlgorithm(stream);\n  }\n\n  function cancelAlgorithm(reason: any): Promise<void> {\n    TransformStreamErrorWritableAndUnblockWrite(stream, reason);\n    return promiseResolvedWith(undefined);\n  }\n\n  stream._readable = CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, readableHighWaterMark,\n                                          readableSizeAlgorithm);\n\n  // The [[backpressure]] slot is set to undefined so that it can be initialised by TransformStreamSetBackpressure.\n  stream._backpressure = undefined!;\n  stream._backpressureChangePromise = undefined!;\n  stream._backpressureChangePromise_resolve = undefined!;\n  TransformStreamSetBackpressure(stream, true);\n\n  stream._transformStreamController = undefined!;\n}\n\nfunction IsTransformStream(x: unknown): x is TransformStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_transformStreamController')) {\n    return false;\n  }\n\n  return x instanceof TransformStream;\n}\n\n// This is a no-op if both sides are already errored.\nfunction TransformStreamError(stream: TransformStream, e: any) {\n  ReadableStreamDefaultControllerError(\n    stream._readable._readableStreamController as ReadableStreamDefaultController<any>,\n    e\n  );\n  TransformStreamErrorWritableAndUnblockWrite(stream, e);\n}\n\nfunction TransformStreamErrorWritableAndUnblockWrite(stream: TransformStream, e: any) {\n  TransformStreamDefaultControllerClearAlgorithms(stream._transformStreamController);\n  WritableStreamDefaultControllerErrorIfNeeded(stream._writable._writableStreamController, e);\n  if (stream._backpressure) {\n    // Pretend that pull() was called to permit any pending write() calls to complete. TransformStreamSetBackpressure()\n    // cannot be called from enqueue() or pull() once the ReadableStream is errored, so this will will be the final time\n    // _backpressure is set.\n    TransformStreamSetBackpressure(stream, false);\n  }\n}\n\nfunction TransformStreamSetBackpressure(stream: TransformStream, backpressure: boolean) {\n  // Passes also when called during construction.\n  assert(stream._backpressure !== backpressure);\n\n  if (stream._backpressureChangePromise !== undefined) {\n    stream._backpressureChangePromise_resolve();\n  }\n\n  stream._backpressureChangePromise = newPromise(resolve => {\n    stream._backpressureChangePromise_resolve = resolve;\n  });\n\n  stream._backpressure = backpressure;\n}\n\n// Class TransformStreamDefaultController\n\n/**\n * Allows control of the {@link ReadableStream} and {@link WritableStream} of the associated {@link TransformStream}.\n *\n * @public\n */\nexport class TransformStreamDefaultController<O> {\n  /** @internal */\n  _controlledTransformStream: TransformStream<any, O>;\n  /** @internal */\n  _transformAlgorithm: (chunk: any) => Promise<void>;\n  /** @internal */\n  _flushAlgorithm: () => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the desired size to fill the readable side’s internal queue. It can be negative, if the queue is over-full.\n   */\n  get desiredSize(): number | null {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('desiredSize');\n    }\n\n    const readableController = this._controlledTransformStream._readable._readableStreamController;\n    return ReadableStreamDefaultControllerGetDesiredSize(readableController as ReadableStreamDefaultController<O>);\n  }\n\n  /**\n   * Enqueues the given chunk `chunk` in the readable side of the controlled transform stream.\n   */\n  enqueue(chunk: O): void;\n  enqueue(chunk: O = undefined!): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('enqueue');\n    }\n\n    TransformStreamDefaultControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors both the readable side and the writable side of the controlled transform stream, making all future\n   * interactions with it fail with the given error `e`. Any chunks queued for transformation will be discarded.\n   */\n  error(reason: any = undefined): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n\n    TransformStreamDefaultControllerError(this, reason);\n  }\n\n  /**\n   * Closes the readable side and errors the writable side of the controlled transform stream. This is useful when the\n   * transformer only needs to consume a portion of the chunks written to the writable side.\n   */\n  terminate(): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('terminate');\n    }\n\n    TransformStreamDefaultControllerTerminate(this);\n  }\n}\n\nObject.defineProperties(TransformStreamDefaultController.prototype, {\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  terminate: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(TransformStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'TransformStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Transform Stream Default Controller Abstract Operations\n\nfunction IsTransformStreamDefaultController<O = any>(x: any): x is TransformStreamDefaultController<O> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledTransformStream')) {\n    return false;\n  }\n\n  return x instanceof TransformStreamDefaultController;\n}\n\nfunction SetUpTransformStreamDefaultController<I, O>(stream: TransformStream<I, O>,\n                                                     controller: TransformStreamDefaultController<O>,\n                                                     transformAlgorithm: (chunk: I) => Promise<void>,\n                                                     flushAlgorithm: () => Promise<void>) {\n  assert(IsTransformStream(stream));\n  assert(stream._transformStreamController === undefined);\n\n  controller._controlledTransformStream = stream;\n  stream._transformStreamController = controller;\n\n  controller._transformAlgorithm = transformAlgorithm;\n  controller._flushAlgorithm = flushAlgorithm;\n}\n\nfunction SetUpTransformStreamDefaultControllerFromTransformer<I, O>(stream: TransformStream<I, O>,\n                                                                    transformer: ValidatedTransformer<I, O>) {\n  const controller: TransformStreamDefaultController<O> = Object.create(TransformStreamDefaultController.prototype);\n\n  let transformAlgorithm = (chunk: I): Promise<void> => {\n    try {\n      TransformStreamDefaultControllerEnqueue(controller, chunk as unknown as O);\n      return promiseResolvedWith(undefined);\n    } catch (transformResultE) {\n      return promiseRejectedWith(transformResultE);\n    }\n  };\n\n  let flushAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (transformer.transform !== undefined) {\n    transformAlgorithm = chunk => transformer.transform!(chunk, controller);\n  }\n  if (transformer.flush !== undefined) {\n    flushAlgorithm = () => transformer.flush!(controller);\n  }\n\n  SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);\n}\n\nfunction TransformStreamDefaultControllerClearAlgorithms(controller: TransformStreamDefaultController<any>) {\n  controller._transformAlgorithm = undefined!;\n  controller._flushAlgorithm = undefined!;\n}\n\nfunction TransformStreamDefaultControllerEnqueue<O>(controller: TransformStreamDefaultController<O>, chunk: O) {\n  const stream = controller._controlledTransformStream;\n  const readableController = stream._readable._readableStreamController as ReadableStreamDefaultController<O>;\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(readableController)) {\n    throw new TypeError('Readable side is not in a state that permits enqueue');\n  }\n\n  // We throttle transform invocations based on the backpressure of the ReadableStream, but we still\n  // accept TransformStreamDefaultControllerEnqueue() calls.\n\n  try {\n    ReadableStreamDefaultControllerEnqueue(readableController, chunk);\n  } catch (e) {\n    // This happens when readableStrategy.size() throws.\n    TransformStreamErrorWritableAndUnblockWrite(stream, e);\n\n    throw stream._readable._storedError;\n  }\n\n  const backpressure = ReadableStreamDefaultControllerHasBackpressure(readableController);\n  if (backpressure !== stream._backpressure) {\n    assert(backpressure);\n    TransformStreamSetBackpressure(stream, true);\n  }\n}\n\nfunction TransformStreamDefaultControllerError(controller: TransformStreamDefaultController<any>, e: any) {\n  TransformStreamError(controller._controlledTransformStream, e);\n}\n\nfunction TransformStreamDefaultControllerPerformTransform<I, O>(controller: TransformStreamDefaultController<O>,\n                                                                chunk: I) {\n  const transformPromise = controller._transformAlgorithm(chunk);\n  return transformPromiseWith(transformPromise, undefined, r => {\n    TransformStreamError(controller._controlledTransformStream, r);\n    throw r;\n  });\n}\n\nfunction TransformStreamDefaultControllerTerminate<O>(controller: TransformStreamDefaultController<O>) {\n  const stream = controller._controlledTransformStream;\n  const readableController = stream._readable._readableStreamController as ReadableStreamDefaultController<O>;\n\n  ReadableStreamDefaultControllerClose(readableController);\n\n  const error = new TypeError('TransformStream terminated');\n  TransformStreamErrorWritableAndUnblockWrite(stream, error);\n}\n\n// TransformStreamDefaultSink Algorithms\n\nfunction TransformStreamDefaultSinkWriteAlgorithm<I, O>(stream: TransformStream<I, O>, chunk: I): Promise<void> {\n  assert(stream._writable._state === 'writable');\n\n  const controller = stream._transformStreamController;\n\n  if (stream._backpressure) {\n    const backpressureChangePromise = stream._backpressureChangePromise;\n    assert(backpressureChangePromise !== undefined);\n    return transformPromiseWith(backpressureChangePromise, () => {\n      const writable = stream._writable;\n      const state = writable._state;\n      if (state === 'erroring') {\n        throw writable._storedError;\n      }\n      assert(state === 'writable');\n      return TransformStreamDefaultControllerPerformTransform<I, O>(controller, chunk);\n    });\n  }\n\n  return TransformStreamDefaultControllerPerformTransform<I, O>(controller, chunk);\n}\n\nfunction TransformStreamDefaultSinkAbortAlgorithm(stream: TransformStream, reason: any): Promise<void> {\n  // abort() is not called synchronously, so it is possible for abort() to be called when the stream is already\n  // errored.\n  TransformStreamError(stream, reason);\n  return promiseResolvedWith(undefined);\n}\n\nfunction TransformStreamDefaultSinkCloseAlgorithm<I, O>(stream: TransformStream<I, O>): Promise<void> {\n  // stream._readable cannot change after construction, so caching it across a call to user code is safe.\n  const readable = stream._readable;\n\n  const controller = stream._transformStreamController;\n  const flushPromise = controller._flushAlgorithm();\n  TransformStreamDefaultControllerClearAlgorithms(controller);\n\n  // Return a promise that is fulfilled with undefined on success.\n  return transformPromiseWith(flushPromise, () => {\n    if (readable._state === 'errored') {\n      throw readable._storedError;\n    }\n    ReadableStreamDefaultControllerClose(readable._readableStreamController as ReadableStreamDefaultController<O>);\n  }, r => {\n    TransformStreamError(stream, r);\n    throw readable._storedError;\n  });\n}\n\n// TransformStreamDefaultSource Algorithms\n\nfunction TransformStreamDefaultSourcePullAlgorithm(stream: TransformStream): Promise<void> {\n  // Invariant. Enforced by the promises returned by start() and pull().\n  assert(stream._backpressure);\n\n  assert(stream._backpressureChangePromise !== undefined);\n\n  TransformStreamSetBackpressure(stream, false);\n\n  // Prevent the next pull() call until there is backpressure.\n  return stream._backpressureChangePromise;\n}\n\n// Helper functions for the TransformStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `TransformStreamDefaultController.prototype.${name} can only be used on a TransformStreamDefaultController`);\n}\n\n// Helper functions for the TransformStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `TransformStream.prototype.${name} can only be used on a TransformStream`);\n}\n","import {\n  ByteLengthQueuingStrategy,\n  CountQueuingStrategy,\n  ReadableByteStreamController,\n  ReadableStream,\n  ReadableStreamBYOBReader,\n  ReadableStreamBYOBRequest,\n  ReadableStreamDefaultController,\n  ReadableStreamDefaultReader,\n  TransformStream,\n  TransformStreamDefaultController,\n  WritableStream,\n  WritableStreamDefaultController,\n  WritableStreamDefaultWriter\n} from './ponyfill';\nimport { globals } from './utils';\n\n// Export\nexport * from './ponyfill';\n\nconst exports = {\n  ReadableStream,\n  ReadableStreamDefaultController,\n  ReadableByteStreamController,\n  ReadableStreamBYOBRequest,\n  ReadableStreamDefaultReader,\n  ReadableStreamBYOBReader,\n\n  WritableStream,\n  WritableStreamDefaultController,\n  WritableStreamDefaultWriter,\n\n  ByteLengthQueuingStrategy,\n  CountQueuingStrategy,\n\n  TransformStream,\n  TransformStreamDefaultController\n};\n\n// Add classes to global scope\nif (typeof globals !== 'undefined') {\n  for (const prop in exports) {\n    if (Object.prototype.hasOwnProperty.call(exports, prop)) {\n      Object.defineProperty(globals, prop, {\n        value: exports[prop as (keyof 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\ No newline at end of file
diff --git a/node_modules/web-streams-polyfill/dist/polyfill.js b/node_modules/web-streams-polyfill/dist/polyfill.js
new file mode 100644
index 0000000..d985d05
--- /dev/null
+++ b/node_modules/web-streams-polyfill/dist/polyfill.js
@@ -0,0 +1,4382 @@
+/**
+ * web-streams-polyfill v3.2.1
+ */
+(function (global, factory) {
+    typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
+    typeof define === 'function' && define.amd ? define(['exports'], factory) :
+    (global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.WebStreamsPolyfill = {}));
+}(this, (function (exports) { 'use strict';
+
+    /// <reference lib="es2015.symbol" />
+    var SymbolPolyfill = typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol' ?
+        Symbol :
+        function (description) { return "Symbol(" + description + ")"; };
+
+    /// <reference lib="dom" />
+    function noop() {
+        return undefined;
+    }
+    function getGlobals() {
+        if (typeof self !== 'undefined') {
+            return self;
+        }
+        else if (typeof window !== 'undefined') {
+            return window;
+        }
+        else if (typeof global !== 'undefined') {
+            return global;
+        }
+        return undefined;
+    }
+    var globals = getGlobals();
+
+    function typeIsObject(x) {
+        return (typeof x === 'object' && x !== null) || typeof x === 'function';
+    }
+    var rethrowAssertionErrorRejection = noop;
+
+    var originalPromise = Promise;
+    var originalPromiseThen = Promise.prototype.then;
+    var originalPromiseResolve = Promise.resolve.bind(originalPromise);
+    var originalPromiseReject = Promise.reject.bind(originalPromise);
+    function newPromise(executor) {
+        return new originalPromise(executor);
+    }
+    function promiseResolvedWith(value) {
+        return originalPromiseResolve(value);
+    }
+    function promiseRejectedWith(reason) {
+        return originalPromiseReject(reason);
+    }
+    function PerformPromiseThen(promise, onFulfilled, onRejected) {
+        // There doesn't appear to be any way to correctly emulate the behaviour from JavaScript, so this is just an
+        // approximation.
+        return originalPromiseThen.call(promise, onFulfilled, onRejected);
+    }
+    function uponPromise(promise, onFulfilled, onRejected) {
+        PerformPromiseThen(PerformPromiseThen(promise, onFulfilled, onRejected), undefined, rethrowAssertionErrorRejection);
+    }
+    function uponFulfillment(promise, onFulfilled) {
+        uponPromise(promise, onFulfilled);
+    }
+    function uponRejection(promise, onRejected) {
+        uponPromise(promise, undefined, onRejected);
+    }
+    function transformPromiseWith(promise, fulfillmentHandler, rejectionHandler) {
+        return PerformPromiseThen(promise, fulfillmentHandler, rejectionHandler);
+    }
+    function setPromiseIsHandledToTrue(promise) {
+        PerformPromiseThen(promise, undefined, rethrowAssertionErrorRejection);
+    }
+    var queueMicrotask = (function () {
+        var globalQueueMicrotask = globals && globals.queueMicrotask;
+        if (typeof globalQueueMicrotask === 'function') {
+            return globalQueueMicrotask;
+        }
+        var resolvedPromise = promiseResolvedWith(undefined);
+        return function (fn) { return PerformPromiseThen(resolvedPromise, fn); };
+    })();
+    function reflectCall(F, V, args) {
+        if (typeof F !== 'function') {
+            throw new TypeError('Argument is not a function');
+        }
+        return Function.prototype.apply.call(F, V, args);
+    }
+    function promiseCall(F, V, args) {
+        try {
+            return promiseResolvedWith(reflectCall(F, V, args));
+        }
+        catch (value) {
+            return promiseRejectedWith(value);
+        }
+    }
+
+    // Original from Chromium
+    // https://chromium.googlesource.com/chromium/src/+/0aee4434a4dba42a42abaea9bfbc0cd196a63bc1/third_party/blink/renderer/core/streams/SimpleQueue.js
+    var QUEUE_MAX_ARRAY_SIZE = 16384;
+    /**
+     * Simple queue structure.
+     *
+     * Avoids scalability issues with using a packed array directly by using
+     * multiple arrays in a linked list and keeping the array size bounded.
+     */
+    var SimpleQueue = /** @class */ (function () {
+        function SimpleQueue() {
+            this._cursor = 0;
+            this._size = 0;
+            // _front and _back are always defined.
+            this._front = {
+                _elements: [],
+                _next: undefined
+            };
+            this._back = this._front;
+            // The cursor is used to avoid calling Array.shift().
+            // It contains the index of the front element of the array inside the
+            // front-most node. It is always in the range [0, QUEUE_MAX_ARRAY_SIZE).
+            this._cursor = 0;
+            // When there is only one node, size === elements.length - cursor.
+            this._size = 0;
+        }
+        Object.defineProperty(SimpleQueue.prototype, "length", {
+            get: function () {
+                return this._size;
+            },
+            enumerable: false,
+            configurable: true
+        });
+        // For exception safety, this method is structured in order:
+        // 1. Read state
+        // 2. Calculate required state mutations
+        // 3. Perform state mutations
+        SimpleQueue.prototype.push = function (element) {
+            var oldBack = this._back;
+            var newBack = oldBack;
+            if (oldBack._elements.length === QUEUE_MAX_ARRAY_SIZE - 1) {
+                newBack = {
+                    _elements: [],
+                    _next: undefined
+                };
+            }
+            // push() is the mutation most likely to throw an exception, so it
+            // goes first.
+            oldBack._elements.push(element);
+            if (newBack !== oldBack) {
+                this._back = newBack;
+                oldBack._next = newBack;
+            }
+            ++this._size;
+        };
+        // Like push(), shift() follows the read -> calculate -> mutate pattern for
+        // exception safety.
+        SimpleQueue.prototype.shift = function () { // must not be called on an empty queue
+            var oldFront = this._front;
+            var newFront = oldFront;
+            var oldCursor = this._cursor;
+            var newCursor = oldCursor + 1;
+            var elements = oldFront._elements;
+            var element = elements[oldCursor];
+            if (newCursor === QUEUE_MAX_ARRAY_SIZE) {
+                newFront = oldFront._next;
+                newCursor = 0;
+            }
+            // No mutations before this point.
+            --this._size;
+            this._cursor = newCursor;
+            if (oldFront !== newFront) {
+                this._front = newFront;
+            }
+            // Permit shifted element to be garbage collected.
+            elements[oldCursor] = undefined;
+            return element;
+        };
+        // The tricky thing about forEach() is that it can be called
+        // re-entrantly. The queue may be mutated inside the callback. It is easy to
+        // see that push() within the callback has no negative effects since the end
+        // of the queue is checked for on every iteration. If shift() is called
+        // repeatedly within the callback then the next iteration may return an
+        // element that has been removed. In this case the callback will be called
+        // with undefined values until we either "catch up" with elements that still
+        // exist or reach the back of the queue.
+        SimpleQueue.prototype.forEach = function (callback) {
+            var i = this._cursor;
+            var node = this._front;
+            var elements = node._elements;
+            while (i !== elements.length || node._next !== undefined) {
+                if (i === elements.length) {
+                    node = node._next;
+                    elements = node._elements;
+                    i = 0;
+                    if (elements.length === 0) {
+                        break;
+                    }
+                }
+                callback(elements[i]);
+                ++i;
+            }
+        };
+        // Return the element that would be returned if shift() was called now,
+        // without modifying the queue.
+        SimpleQueue.prototype.peek = function () { // must not be called on an empty queue
+            var front = this._front;
+            var cursor = this._cursor;
+            return front._elements[cursor];
+        };
+        return SimpleQueue;
+    }());
+
+    function ReadableStreamReaderGenericInitialize(reader, stream) {
+        reader._ownerReadableStream = stream;
+        stream._reader = reader;
+        if (stream._state === 'readable') {
+            defaultReaderClosedPromiseInitialize(reader);
+        }
+        else if (stream._state === 'closed') {
+            defaultReaderClosedPromiseInitializeAsResolved(reader);
+        }
+        else {
+            defaultReaderClosedPromiseInitializeAsRejected(reader, stream._storedError);
+        }
+    }
+    // A client of ReadableStreamDefaultReader and ReadableStreamBYOBReader may use these functions directly to bypass state
+    // check.
+    function ReadableStreamReaderGenericCancel(reader, reason) {
+        var stream = reader._ownerReadableStream;
+        return ReadableStreamCancel(stream, reason);
+    }
+    function ReadableStreamReaderGenericRelease(reader) {
+        if (reader._ownerReadableStream._state === 'readable') {
+            defaultReaderClosedPromiseReject(reader, new TypeError("Reader was released and can no longer be used to monitor the stream's closedness"));
+        }
+        else {
+            defaultReaderClosedPromiseResetToRejected(reader, new TypeError("Reader was released and can no longer be used to monitor the stream's closedness"));
+        }
+        reader._ownerReadableStream._reader = undefined;
+        reader._ownerReadableStream = undefined;
+    }
+    // Helper functions for the readers.
+    function readerLockException(name) {
+        return new TypeError('Cannot ' + name + ' a stream using a released reader');
+    }
+    // Helper functions for the ReadableStreamDefaultReader.
+    function defaultReaderClosedPromiseInitialize(reader) {
+        reader._closedPromise = newPromise(function (resolve, reject) {
+            reader._closedPromise_resolve = resolve;
+            reader._closedPromise_reject = reject;
+        });
+    }
+    function defaultReaderClosedPromiseInitializeAsRejected(reader, reason) {
+        defaultReaderClosedPromiseInitialize(reader);
+        defaultReaderClosedPromiseReject(reader, reason);
+    }
+    function defaultReaderClosedPromiseInitializeAsResolved(reader) {
+        defaultReaderClosedPromiseInitialize(reader);
+        defaultReaderClosedPromiseResolve(reader);
+    }
+    function defaultReaderClosedPromiseReject(reader, reason) {
+        if (reader._closedPromise_reject === undefined) {
+            return;
+        }
+        setPromiseIsHandledToTrue(reader._closedPromise);
+        reader._closedPromise_reject(reason);
+        reader._closedPromise_resolve = undefined;
+        reader._closedPromise_reject = undefined;
+    }
+    function defaultReaderClosedPromiseResetToRejected(reader, reason) {
+        defaultReaderClosedPromiseInitializeAsRejected(reader, reason);
+    }
+    function defaultReaderClosedPromiseResolve(reader) {
+        if (reader._closedPromise_resolve === undefined) {
+            return;
+        }
+        reader._closedPromise_resolve(undefined);
+        reader._closedPromise_resolve = undefined;
+        reader._closedPromise_reject = undefined;
+    }
+
+    var AbortSteps = SymbolPolyfill('[[AbortSteps]]');
+    var ErrorSteps = SymbolPolyfill('[[ErrorSteps]]');
+    var CancelSteps = SymbolPolyfill('[[CancelSteps]]');
+    var PullSteps = SymbolPolyfill('[[PullSteps]]');
+
+    /// <reference lib="es2015.core" />
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite#Polyfill
+    var NumberIsFinite = Number.isFinite || function (x) {
+        return typeof x === 'number' && isFinite(x);
+    };
+
+    /// <reference lib="es2015.core" />
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc#Polyfill
+    var MathTrunc = Math.trunc || function (v) {
+        return v < 0 ? Math.ceil(v) : Math.floor(v);
+    };
+
+    // https://heycam.github.io/webidl/#idl-dictionaries
+    function isDictionary(x) {
+        return typeof x === 'object' || typeof x === 'function';
+    }
+    function assertDictionary(obj, context) {
+        if (obj !== undefined && !isDictionary(obj)) {
+            throw new TypeError(context + " is not an object.");
+        }
+    }
+    // https://heycam.github.io/webidl/#idl-callback-functions
+    function assertFunction(x, context) {
+        if (typeof x !== 'function') {
+            throw new TypeError(context + " is not a function.");
+        }
+    }
+    // https://heycam.github.io/webidl/#idl-object
+    function isObject(x) {
+        return (typeof x === 'object' && x !== null) || typeof x === 'function';
+    }
+    function assertObject(x, context) {
+        if (!isObject(x)) {
+            throw new TypeError(context + " is not an object.");
+        }
+    }
+    function assertRequiredArgument(x, position, context) {
+        if (x === undefined) {
+            throw new TypeError("Parameter " + position + " is required in '" + context + "'.");
+        }
+    }
+    function assertRequiredField(x, field, context) {
+        if (x === undefined) {
+            throw new TypeError(field + " is required in '" + context + "'.");
+        }
+    }
+    // https://heycam.github.io/webidl/#idl-unrestricted-double
+    function convertUnrestrictedDouble(value) {
+        return Number(value);
+    }
+    function censorNegativeZero(x) {
+        return x === 0 ? 0 : x;
+    }
+    function integerPart(x) {
+        return censorNegativeZero(MathTrunc(x));
+    }
+    // https://heycam.github.io/webidl/#idl-unsigned-long-long
+    function convertUnsignedLongLongWithEnforceRange(value, context) {
+        var lowerBound = 0;
+        var upperBound = Number.MAX_SAFE_INTEGER;
+        var x = Number(value);
+        x = censorNegativeZero(x);
+        if (!NumberIsFinite(x)) {
+            throw new TypeError(context + " is not a finite number");
+        }
+        x = integerPart(x);
+        if (x < lowerBound || x > upperBound) {
+            throw new TypeError(context + " is outside the accepted range of " + lowerBound + " to " + upperBound + ", inclusive");
+        }
+        if (!NumberIsFinite(x) || x === 0) {
+            return 0;
+        }
+        // TODO Use BigInt if supported?
+        // let xBigInt = BigInt(integerPart(x));
+        // xBigInt = BigInt.asUintN(64, xBigInt);
+        // return Number(xBigInt);
+        return x;
+    }
+
+    function assertReadableStream(x, context) {
+        if (!IsReadableStream(x)) {
+            throw new TypeError(context + " is not a ReadableStream.");
+        }
+    }
+
+    // Abstract operations for the ReadableStream.
+    function AcquireReadableStreamDefaultReader(stream) {
+        return new ReadableStreamDefaultReader(stream);
+    }
+    // ReadableStream API exposed for controllers.
+    function ReadableStreamAddReadRequest(stream, readRequest) {
+        stream._reader._readRequests.push(readRequest);
+    }
+    function ReadableStreamFulfillReadRequest(stream, chunk, done) {
+        var reader = stream._reader;
+        var readRequest = reader._readRequests.shift();
+        if (done) {
+            readRequest._closeSteps();
+        }
+        else {
+            readRequest._chunkSteps(chunk);
+        }
+    }
+    function ReadableStreamGetNumReadRequests(stream) {
+        return stream._reader._readRequests.length;
+    }
+    function ReadableStreamHasDefaultReader(stream) {
+        var reader = stream._reader;
+        if (reader === undefined) {
+            return false;
+        }
+        if (!IsReadableStreamDefaultReader(reader)) {
+            return false;
+        }
+        return true;
+    }
+    /**
+     * A default reader vended by a {@link ReadableStream}.
+     *
+     * @public
+     */
+    var ReadableStreamDefaultReader = /** @class */ (function () {
+        function ReadableStreamDefaultReader(stream) {
+            assertRequiredArgument(stream, 1, 'ReadableStreamDefaultReader');
+            assertReadableStream(stream, 'First parameter');
+            if (IsReadableStreamLocked(stream)) {
+                throw new TypeError('This stream has already been locked for exclusive reading by another reader');
+            }
+            ReadableStreamReaderGenericInitialize(this, stream);
+            this._readRequests = new SimpleQueue();
+        }
+        Object.defineProperty(ReadableStreamDefaultReader.prototype, "closed", {
+            /**
+             * Returns a promise that will be fulfilled when the stream becomes closed,
+             * or rejected if the stream ever errors or the reader's lock is released before the stream finishes closing.
+             */
+            get: function () {
+                if (!IsReadableStreamDefaultReader(this)) {
+                    return promiseRejectedWith(defaultReaderBrandCheckException('closed'));
+                }
+                return this._closedPromise;
+            },
+            enumerable: false,
+            configurable: true
+        });
+        /**
+         * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.
+         */
+        ReadableStreamDefaultReader.prototype.cancel = function (reason) {
+            if (reason === void 0) { reason = undefined; }
+            if (!IsReadableStreamDefaultReader(this)) {
+                return promiseRejectedWith(defaultReaderBrandCheckException('cancel'));
+            }
+            if (this._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('cancel'));
+            }
+            return ReadableStreamReaderGenericCancel(this, reason);
+        };
+        /**
+         * Returns a promise that allows access to the next chunk from the stream's internal queue, if available.
+         *
+         * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.
+         */
+        ReadableStreamDefaultReader.prototype.read = function () {
+            if (!IsReadableStreamDefaultReader(this)) {
+                return promiseRejectedWith(defaultReaderBrandCheckException('read'));
+            }
+            if (this._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('read from'));
+            }
+            var resolvePromise;
+            var rejectPromise;
+            var promise = newPromise(function (resolve, reject) {
+                resolvePromise = resolve;
+                rejectPromise = reject;
+            });
+            var readRequest = {
+                _chunkSteps: function (chunk) { return resolvePromise({ value: chunk, done: false }); },
+                _closeSteps: function () { return resolvePromise({ value: undefined, done: true }); },
+                _errorSteps: function (e) { return rejectPromise(e); }
+            };
+            ReadableStreamDefaultReaderRead(this, readRequest);
+            return promise;
+        };
+        /**
+         * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.
+         * If the associated stream is errored when the lock is released, the reader will appear errored in the same way
+         * from now on; otherwise, the reader will appear closed.
+         *
+         * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by
+         * the reader's {@link ReadableStreamDefaultReader.read | read()} method has not yet been settled. Attempting to
+         * do so will throw a `TypeError` and leave the reader locked to the stream.
+         */
+        ReadableStreamDefaultReader.prototype.releaseLock = function () {
+            if (!IsReadableStreamDefaultReader(this)) {
+                throw defaultReaderBrandCheckException('releaseLock');
+            }
+            if (this._ownerReadableStream === undefined) {
+                return;
+            }
+            if (this._readRequests.length > 0) {
+                throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');
+            }
+            ReadableStreamReaderGenericRelease(this);
+        };
+        return ReadableStreamDefaultReader;
+    }());
+    Object.defineProperties(ReadableStreamDefaultReader.prototype, {
+        cancel: { enumerable: true },
+        read: { enumerable: true },
+        releaseLock: { enumerable: true },
+        closed: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableStreamDefaultReader.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableStreamDefaultReader',
+            configurable: true
+        });
+    }
+    // Abstract operations for the readers.
+    function IsReadableStreamDefaultReader(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_readRequests')) {
+            return false;
+        }
+        return x instanceof ReadableStreamDefaultReader;
+    }
+    function ReadableStreamDefaultReaderRead(reader, readRequest) {
+        var stream = reader._ownerReadableStream;
+        stream._disturbed = true;
+        if (stream._state === 'closed') {
+            readRequest._closeSteps();
+        }
+        else if (stream._state === 'errored') {
+            readRequest._errorSteps(stream._storedError);
+        }
+        else {
+            stream._readableStreamController[PullSteps](readRequest);
+        }
+    }
+    // Helper functions for the ReadableStreamDefaultReader.
+    function defaultReaderBrandCheckException(name) {
+        return new TypeError("ReadableStreamDefaultReader.prototype." + name + " can only be used on a ReadableStreamDefaultReader");
+    }
+
+    /// <reference lib="es2018.asynciterable" />
+    var _a;
+    var AsyncIteratorPrototype;
+    if (typeof SymbolPolyfill.asyncIterator === 'symbol') {
+        // We're running inside a ES2018+ environment, but we're compiling to an older syntax.
+        // We cannot access %AsyncIteratorPrototype% without non-ES2018 syntax, but we can re-create it.
+        AsyncIteratorPrototype = (_a = {},
+            // 25.1.3.1 %AsyncIteratorPrototype% [ @@asyncIterator ] ( )
+            // https://tc39.github.io/ecma262/#sec-asynciteratorprototype-asynciterator
+            _a[SymbolPolyfill.asyncIterator] = function () {
+                return this;
+            },
+            _a);
+        Object.defineProperty(AsyncIteratorPrototype, SymbolPolyfill.asyncIterator, { enumerable: false });
+    }
+
+    /// <reference lib="es2018.asynciterable" />
+    var ReadableStreamAsyncIteratorImpl = /** @class */ (function () {
+        function ReadableStreamAsyncIteratorImpl(reader, preventCancel) {
+            this._ongoingPromise = undefined;
+            this._isFinished = false;
+            this._reader = reader;
+            this._preventCancel = preventCancel;
+        }
+        ReadableStreamAsyncIteratorImpl.prototype.next = function () {
+            var _this = this;
+            var nextSteps = function () { return _this._nextSteps(); };
+            this._ongoingPromise = this._ongoingPromise ?
+                transformPromiseWith(this._ongoingPromise, nextSteps, nextSteps) :
+                nextSteps();
+            return this._ongoingPromise;
+        };
+        ReadableStreamAsyncIteratorImpl.prototype.return = function (value) {
+            var _this = this;
+            var returnSteps = function () { return _this._returnSteps(value); };
+            return this._ongoingPromise ?
+                transformPromiseWith(this._ongoingPromise, returnSteps, returnSteps) :
+                returnSteps();
+        };
+        ReadableStreamAsyncIteratorImpl.prototype._nextSteps = function () {
+            var _this = this;
+            if (this._isFinished) {
+                return Promise.resolve({ value: undefined, done: true });
+            }
+            var reader = this._reader;
+            if (reader._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('iterate'));
+            }
+            var resolvePromise;
+            var rejectPromise;
+            var promise = newPromise(function (resolve, reject) {
+                resolvePromise = resolve;
+                rejectPromise = reject;
+            });
+            var readRequest = {
+                _chunkSteps: function (chunk) {
+                    _this._ongoingPromise = undefined;
+                    // This needs to be delayed by one microtask, otherwise we stop pulling too early which breaks a test.
+                    // FIXME Is this a bug in the specification, or in the test?
+                    queueMicrotask(function () { return resolvePromise({ value: chunk, done: false }); });
+                },
+                _closeSteps: function () {
+                    _this._ongoingPromise = undefined;
+                    _this._isFinished = true;
+                    ReadableStreamReaderGenericRelease(reader);
+                    resolvePromise({ value: undefined, done: true });
+                },
+                _errorSteps: function (reason) {
+                    _this._ongoingPromise = undefined;
+                    _this._isFinished = true;
+                    ReadableStreamReaderGenericRelease(reader);
+                    rejectPromise(reason);
+                }
+            };
+            ReadableStreamDefaultReaderRead(reader, readRequest);
+            return promise;
+        };
+        ReadableStreamAsyncIteratorImpl.prototype._returnSteps = function (value) {
+            if (this._isFinished) {
+                return Promise.resolve({ value: value, done: true });
+            }
+            this._isFinished = true;
+            var reader = this._reader;
+            if (reader._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('finish iterating'));
+            }
+            if (!this._preventCancel) {
+                var result = ReadableStreamReaderGenericCancel(reader, value);
+                ReadableStreamReaderGenericRelease(reader);
+                return transformPromiseWith(result, function () { return ({ value: value, done: true }); });
+            }
+            ReadableStreamReaderGenericRelease(reader);
+            return promiseResolvedWith({ value: value, done: true });
+        };
+        return ReadableStreamAsyncIteratorImpl;
+    }());
+    var ReadableStreamAsyncIteratorPrototype = {
+        next: function () {
+            if (!IsReadableStreamAsyncIterator(this)) {
+                return promiseRejectedWith(streamAsyncIteratorBrandCheckException('next'));
+            }
+            return this._asyncIteratorImpl.next();
+        },
+        return: function (value) {
+            if (!IsReadableStreamAsyncIterator(this)) {
+                return promiseRejectedWith(streamAsyncIteratorBrandCheckException('return'));
+            }
+            return this._asyncIteratorImpl.return(value);
+        }
+    };
+    if (AsyncIteratorPrototype !== undefined) {
+        Object.setPrototypeOf(ReadableStreamAsyncIteratorPrototype, AsyncIteratorPrototype);
+    }
+    // Abstract operations for the ReadableStream.
+    function AcquireReadableStreamAsyncIterator(stream, preventCancel) {
+        var reader = AcquireReadableStreamDefaultReader(stream);
+        var impl = new ReadableStreamAsyncIteratorImpl(reader, preventCancel);
+        var iterator = Object.create(ReadableStreamAsyncIteratorPrototype);
+        iterator._asyncIteratorImpl = impl;
+        return iterator;
+    }
+    function IsReadableStreamAsyncIterator(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_asyncIteratorImpl')) {
+            return false;
+        }
+        try {
+            // noinspection SuspiciousTypeOfGuard
+            return x._asyncIteratorImpl instanceof
+                ReadableStreamAsyncIteratorImpl;
+        }
+        catch (_a) {
+            return false;
+        }
+    }
+    // Helper functions for the ReadableStream.
+    function streamAsyncIteratorBrandCheckException(name) {
+        return new TypeError("ReadableStreamAsyncIterator." + name + " can only be used on a ReadableSteamAsyncIterator");
+    }
+
+    /// <reference lib="es2015.core" />
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Polyfill
+    var NumberIsNaN = Number.isNaN || function (x) {
+        // eslint-disable-next-line no-self-compare
+        return x !== x;
+    };
+
+    function CreateArrayFromList(elements) {
+        // We use arrays to represent lists, so this is basically a no-op.
+        // Do a slice though just in case we happen to depend on the unique-ness.
+        return elements.slice();
+    }
+    function CopyDataBlockBytes(dest, destOffset, src, srcOffset, n) {
+        new Uint8Array(dest).set(new Uint8Array(src, srcOffset, n), destOffset);
+    }
+    // Not implemented correctly
+    function TransferArrayBuffer(O) {
+        return O;
+    }
+    // Not implemented correctly
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    function IsDetachedBuffer(O) {
+        return false;
+    }
+    function ArrayBufferSlice(buffer, begin, end) {
+        // ArrayBuffer.prototype.slice is not available on IE10
+        // https://www.caniuse.com/mdn-javascript_builtins_arraybuffer_slice
+        if (buffer.slice) {
+            return buffer.slice(begin, end);
+        }
+        var length = end - begin;
+        var slice = new ArrayBuffer(length);
+        CopyDataBlockBytes(slice, 0, buffer, begin, length);
+        return slice;
+    }
+
+    function IsNonNegativeNumber(v) {
+        if (typeof v !== 'number') {
+            return false;
+        }
+        if (NumberIsNaN(v)) {
+            return false;
+        }
+        if (v < 0) {
+            return false;
+        }
+        return true;
+    }
+    function CloneAsUint8Array(O) {
+        var buffer = ArrayBufferSlice(O.buffer, O.byteOffset, O.byteOffset + O.byteLength);
+        return new Uint8Array(buffer);
+    }
+
+    function DequeueValue(container) {
+        var pair = container._queue.shift();
+        container._queueTotalSize -= pair.size;
+        if (container._queueTotalSize < 0) {
+            container._queueTotalSize = 0;
+        }
+        return pair.value;
+    }
+    function EnqueueValueWithSize(container, value, size) {
+        if (!IsNonNegativeNumber(size) || size === Infinity) {
+            throw new RangeError('Size must be a finite, non-NaN, non-negative number.');
+        }
+        container._queue.push({ value: value, size: size });
+        container._queueTotalSize += size;
+    }
+    function PeekQueueValue(container) {
+        var pair = container._queue.peek();
+        return pair.value;
+    }
+    function ResetQueue(container) {
+        container._queue = new SimpleQueue();
+        container._queueTotalSize = 0;
+    }
+
+    /**
+     * A pull-into request in a {@link ReadableByteStreamController}.
+     *
+     * @public
+     */
+    var ReadableStreamBYOBRequest = /** @class */ (function () {
+        function ReadableStreamBYOBRequest() {
+            throw new TypeError('Illegal constructor');
+        }
+        Object.defineProperty(ReadableStreamBYOBRequest.prototype, "view", {
+            /**
+             * Returns the view for writing in to, or `null` if the BYOB request has already been responded to.
+             */
+            get: function () {
+                if (!IsReadableStreamBYOBRequest(this)) {
+                    throw byobRequestBrandCheckException('view');
+                }
+                return this._view;
+            },
+            enumerable: false,
+            configurable: true
+        });
+        ReadableStreamBYOBRequest.prototype.respond = function (bytesWritten) {
+            if (!IsReadableStreamBYOBRequest(this)) {
+                throw byobRequestBrandCheckException('respond');
+            }
+            assertRequiredArgument(bytesWritten, 1, 'respond');
+            bytesWritten = convertUnsignedLongLongWithEnforceRange(bytesWritten, 'First parameter');
+            if (this._associatedReadableByteStreamController === undefined) {
+                throw new TypeError('This BYOB request has been invalidated');
+            }
+            if (IsDetachedBuffer(this._view.buffer)) ;
+            ReadableByteStreamControllerRespond(this._associatedReadableByteStreamController, bytesWritten);
+        };
+        ReadableStreamBYOBRequest.prototype.respondWithNewView = function (view) {
+            if (!IsReadableStreamBYOBRequest(this)) {
+                throw byobRequestBrandCheckException('respondWithNewView');
+            }
+            assertRequiredArgument(view, 1, 'respondWithNewView');
+            if (!ArrayBuffer.isView(view)) {
+                throw new TypeError('You can only respond with array buffer views');
+            }
+            if (this._associatedReadableByteStreamController === undefined) {
+                throw new TypeError('This BYOB request has been invalidated');
+            }
+            if (IsDetachedBuffer(view.buffer)) ;
+            ReadableByteStreamControllerRespondWithNewView(this._associatedReadableByteStreamController, view);
+        };
+        return ReadableStreamBYOBRequest;
+    }());
+    Object.defineProperties(ReadableStreamBYOBRequest.prototype, {
+        respond: { enumerable: true },
+        respondWithNewView: { enumerable: true },
+        view: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableStreamBYOBRequest.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableStreamBYOBRequest',
+            configurable: true
+        });
+    }
+    /**
+     * Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue.
+     *
+     * @public
+     */
+    var ReadableByteStreamController = /** @class */ (function () {
+        function ReadableByteStreamController() {
+            throw new TypeError('Illegal constructor');
+        }
+        Object.defineProperty(ReadableByteStreamController.prototype, "byobRequest", {
+            /**
+             * Returns the current BYOB pull request, or `null` if there isn't one.
+             */
+            get: function () {
+                if (!IsReadableByteStreamController(this)) {
+                    throw byteStreamControllerBrandCheckException('byobRequest');
+                }
+                return ReadableByteStreamControllerGetBYOBRequest(this);
+            },
+            enumerable: false,
+            configurable: true
+        });
+        Object.defineProperty(ReadableByteStreamController.prototype, "desiredSize", {
+            /**
+             * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is
+             * over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure.
+             */
+            get: function () {
+                if (!IsReadableByteStreamController(this)) {
+                    throw byteStreamControllerBrandCheckException('desiredSize');
+                }
+                return ReadableByteStreamControllerGetDesiredSize(this);
+            },
+            enumerable: false,
+            configurable: true
+        });
+        /**
+         * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from
+         * the stream, but once those are read, the stream will become closed.
+         */
+        ReadableByteStreamController.prototype.close = function () {
+            if (!IsReadableByteStreamController(this)) {
+                throw byteStreamControllerBrandCheckException('close');
+            }
+            if (this._closeRequested) {
+                throw new TypeError('The stream has already been closed; do not close it again!');
+            }
+            var state = this._controlledReadableByteStream._state;
+            if (state !== 'readable') {
+                throw new TypeError("The stream (in " + state + " state) is not in the readable state and cannot be closed");
+            }
+            ReadableByteStreamControllerClose(this);
+        };
+        ReadableByteStreamController.prototype.enqueue = function (chunk) {
+            if (!IsReadableByteStreamController(this)) {
+                throw byteStreamControllerBrandCheckException('enqueue');
+            }
+            assertRequiredArgument(chunk, 1, 'enqueue');
+            if (!ArrayBuffer.isView(chunk)) {
+                throw new TypeError('chunk must be an array buffer view');
+            }
+            if (chunk.byteLength === 0) {
+                throw new TypeError('chunk must have non-zero byteLength');
+            }
+            if (chunk.buffer.byteLength === 0) {
+                throw new TypeError("chunk's buffer must have non-zero byteLength");
+            }
+            if (this._closeRequested) {
+                throw new TypeError('stream is closed or draining');
+            }
+            var state = this._controlledReadableByteStream._state;
+            if (state !== 'readable') {
+                throw new TypeError("The stream (in " + state + " state) is not in the readable state and cannot be enqueued to");
+            }
+            ReadableByteStreamControllerEnqueue(this, chunk);
+        };
+        /**
+         * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.
+         */
+        ReadableByteStreamController.prototype.error = function (e) {
+            if (e === void 0) { e = undefined; }
+            if (!IsReadableByteStreamController(this)) {
+                throw byteStreamControllerBrandCheckException('error');
+            }
+            ReadableByteStreamControllerError(this, e);
+        };
+        /** @internal */
+        ReadableByteStreamController.prototype[CancelSteps] = function (reason) {
+            ReadableByteStreamControllerClearPendingPullIntos(this);
+            ResetQueue(this);
+            var result = this._cancelAlgorithm(reason);
+            ReadableByteStreamControllerClearAlgorithms(this);
+            return result;
+        };
+        /** @internal */
+        ReadableByteStreamController.prototype[PullSteps] = function (readRequest) {
+            var stream = this._controlledReadableByteStream;
+            if (this._queueTotalSize > 0) {
+                var entry = this._queue.shift();
+                this._queueTotalSize -= entry.byteLength;
+                ReadableByteStreamControllerHandleQueueDrain(this);
+                var view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);
+                readRequest._chunkSteps(view);
+                return;
+            }
+            var autoAllocateChunkSize = this._autoAllocateChunkSize;
+            if (autoAllocateChunkSize !== undefined) {
+                var buffer = void 0;
+                try {
+                    buffer = new ArrayBuffer(autoAllocateChunkSize);
+                }
+                catch (bufferE) {
+                    readRequest._errorSteps(bufferE);
+                    return;
+                }
+                var pullIntoDescriptor = {
+                    buffer: buffer,
+                    bufferByteLength: autoAllocateChunkSize,
+                    byteOffset: 0,
+                    byteLength: autoAllocateChunkSize,
+                    bytesFilled: 0,
+                    elementSize: 1,
+                    viewConstructor: Uint8Array,
+                    readerType: 'default'
+                };
+                this._pendingPullIntos.push(pullIntoDescriptor);
+            }
+            ReadableStreamAddReadRequest(stream, readRequest);
+            ReadableByteStreamControllerCallPullIfNeeded(this);
+        };
+        return ReadableByteStreamController;
+    }());
+    Object.defineProperties(ReadableByteStreamController.prototype, {
+        close: { enumerable: true },
+        enqueue: { enumerable: true },
+        error: { enumerable: true },
+        byobRequest: { enumerable: true },
+        desiredSize: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableByteStreamController.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableByteStreamController',
+            configurable: true
+        });
+    }
+    // Abstract operations for the ReadableByteStreamController.
+    function IsReadableByteStreamController(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableByteStream')) {
+            return false;
+        }
+        return x instanceof ReadableByteStreamController;
+    }
+    function IsReadableStreamBYOBRequest(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_associatedReadableByteStreamController')) {
+            return false;
+        }
+        return x instanceof ReadableStreamBYOBRequest;
+    }
+    function ReadableByteStreamControllerCallPullIfNeeded(controller) {
+        var shouldPull = ReadableByteStreamControllerShouldCallPull(controller);
+        if (!shouldPull) {
+            return;
+        }
+        if (controller._pulling) {
+            controller._pullAgain = true;
+            return;
+        }
+        controller._pulling = true;
+        // TODO: Test controller argument
+        var pullPromise = controller._pullAlgorithm();
+        uponPromise(pullPromise, function () {
+            controller._pulling = false;
+            if (controller._pullAgain) {
+                controller._pullAgain = false;
+                ReadableByteStreamControllerCallPullIfNeeded(controller);
+            }
+        }, function (e) {
+            ReadableByteStreamControllerError(controller, e);
+        });
+    }
+    function ReadableByteStreamControllerClearPendingPullIntos(controller) {
+        ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+        controller._pendingPullIntos = new SimpleQueue();
+    }
+    function ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor) {
+        var done = false;
+        if (stream._state === 'closed') {
+            done = true;
+        }
+        var filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor);
+        if (pullIntoDescriptor.readerType === 'default') {
+            ReadableStreamFulfillReadRequest(stream, filledView, done);
+        }
+        else {
+            ReadableStreamFulfillReadIntoRequest(stream, filledView, done);
+        }
+    }
+    function ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor) {
+        var bytesFilled = pullIntoDescriptor.bytesFilled;
+        var elementSize = pullIntoDescriptor.elementSize;
+        return new pullIntoDescriptor.viewConstructor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize);
+    }
+    function ReadableByteStreamControllerEnqueueChunkToQueue(controller, buffer, byteOffset, byteLength) {
+        controller._queue.push({ buffer: buffer, byteOffset: byteOffset, byteLength: byteLength });
+        controller._queueTotalSize += byteLength;
+    }
+    function ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor) {
+        var elementSize = pullIntoDescriptor.elementSize;
+        var currentAlignedBytes = pullIntoDescriptor.bytesFilled - pullIntoDescriptor.bytesFilled % elementSize;
+        var maxBytesToCopy = Math.min(controller._queueTotalSize, pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled);
+        var maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;
+        var maxAlignedBytes = maxBytesFilled - maxBytesFilled % elementSize;
+        var totalBytesToCopyRemaining = maxBytesToCopy;
+        var ready = false;
+        if (maxAlignedBytes > currentAlignedBytes) {
+            totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled;
+            ready = true;
+        }
+        var queue = controller._queue;
+        while (totalBytesToCopyRemaining > 0) {
+            var headOfQueue = queue.peek();
+            var bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength);
+            var destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;
+            CopyDataBlockBytes(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy);
+            if (headOfQueue.byteLength === bytesToCopy) {
+                queue.shift();
+            }
+            else {
+                headOfQueue.byteOffset += bytesToCopy;
+                headOfQueue.byteLength -= bytesToCopy;
+            }
+            controller._queueTotalSize -= bytesToCopy;
+            ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor);
+            totalBytesToCopyRemaining -= bytesToCopy;
+        }
+        return ready;
+    }
+    function ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, size, pullIntoDescriptor) {
+        pullIntoDescriptor.bytesFilled += size;
+    }
+    function ReadableByteStreamControllerHandleQueueDrain(controller) {
+        if (controller._queueTotalSize === 0 && controller._closeRequested) {
+            ReadableByteStreamControllerClearAlgorithms(controller);
+            ReadableStreamClose(controller._controlledReadableByteStream);
+        }
+        else {
+            ReadableByteStreamControllerCallPullIfNeeded(controller);
+        }
+    }
+    function ReadableByteStreamControllerInvalidateBYOBRequest(controller) {
+        if (controller._byobRequest === null) {
+            return;
+        }
+        controller._byobRequest._associatedReadableByteStreamController = undefined;
+        controller._byobRequest._view = null;
+        controller._byobRequest = null;
+    }
+    function ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller) {
+        while (controller._pendingPullIntos.length > 0) {
+            if (controller._queueTotalSize === 0) {
+                return;
+            }
+            var pullIntoDescriptor = controller._pendingPullIntos.peek();
+            if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {
+                ReadableByteStreamControllerShiftPendingPullInto(controller);
+                ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);
+            }
+        }
+    }
+    function ReadableByteStreamControllerPullInto(controller, view, readIntoRequest) {
+        var stream = controller._controlledReadableByteStream;
+        var elementSize = 1;
+        if (view.constructor !== DataView) {
+            elementSize = view.constructor.BYTES_PER_ELEMENT;
+        }
+        var ctor = view.constructor;
+        // try {
+        var buffer = TransferArrayBuffer(view.buffer);
+        // } catch (e) {
+        //   readIntoRequest._errorSteps(e);
+        //   return;
+        // }
+        var pullIntoDescriptor = {
+            buffer: buffer,
+            bufferByteLength: buffer.byteLength,
+            byteOffset: view.byteOffset,
+            byteLength: view.byteLength,
+            bytesFilled: 0,
+            elementSize: elementSize,
+            viewConstructor: ctor,
+            readerType: 'byob'
+        };
+        if (controller._pendingPullIntos.length > 0) {
+            controller._pendingPullIntos.push(pullIntoDescriptor);
+            // No ReadableByteStreamControllerCallPullIfNeeded() call since:
+            // - No change happens on desiredSize
+            // - The source has already been notified of that there's at least 1 pending read(view)
+            ReadableStreamAddReadIntoRequest(stream, readIntoRequest);
+            return;
+        }
+        if (stream._state === 'closed') {
+            var emptyView = new ctor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0);
+            readIntoRequest._closeSteps(emptyView);
+            return;
+        }
+        if (controller._queueTotalSize > 0) {
+            if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {
+                var filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor);
+                ReadableByteStreamControllerHandleQueueDrain(controller);
+                readIntoRequest._chunkSteps(filledView);
+                return;
+            }
+            if (controller._closeRequested) {
+                var e = new TypeError('Insufficient bytes to fill elements in the given buffer');
+                ReadableByteStreamControllerError(controller, e);
+                readIntoRequest._errorSteps(e);
+                return;
+            }
+        }
+        controller._pendingPullIntos.push(pullIntoDescriptor);
+        ReadableStreamAddReadIntoRequest(stream, readIntoRequest);
+        ReadableByteStreamControllerCallPullIfNeeded(controller);
+    }
+    function ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor) {
+        var stream = controller._controlledReadableByteStream;
+        if (ReadableStreamHasBYOBReader(stream)) {
+            while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {
+                var pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);
+                ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);
+            }
+        }
+    }
+    function ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, pullIntoDescriptor) {
+        ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor);
+        if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {
+            return;
+        }
+        ReadableByteStreamControllerShiftPendingPullInto(controller);
+        var remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize;
+        if (remainderSize > 0) {
+            var end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;
+            var remainder = ArrayBufferSlice(pullIntoDescriptor.buffer, end - remainderSize, end);
+            ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength);
+        }
+        pullIntoDescriptor.bytesFilled -= remainderSize;
+        ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);
+        ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);
+    }
+    function ReadableByteStreamControllerRespondInternal(controller, bytesWritten) {
+        var firstDescriptor = controller._pendingPullIntos.peek();
+        ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+        var state = controller._controlledReadableByteStream._state;
+        if (state === 'closed') {
+            ReadableByteStreamControllerRespondInClosedState(controller);
+        }
+        else {
+            ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);
+        }
+        ReadableByteStreamControllerCallPullIfNeeded(controller);
+    }
+    function ReadableByteStreamControllerShiftPendingPullInto(controller) {
+        var descriptor = controller._pendingPullIntos.shift();
+        return descriptor;
+    }
+    function ReadableByteStreamControllerShouldCallPull(controller) {
+        var stream = controller._controlledReadableByteStream;
+        if (stream._state !== 'readable') {
+            return false;
+        }
+        if (controller._closeRequested) {
+            return false;
+        }
+        if (!controller._started) {
+            return false;
+        }
+        if (ReadableStreamHasDefaultReader(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+            return true;
+        }
+        if (ReadableStreamHasBYOBReader(stream) && ReadableStreamGetNumReadIntoRequests(stream) > 0) {
+            return true;
+        }
+        var desiredSize = ReadableByteStreamControllerGetDesiredSize(controller);
+        if (desiredSize > 0) {
+            return true;
+        }
+        return false;
+    }
+    function ReadableByteStreamControllerClearAlgorithms(controller) {
+        controller._pullAlgorithm = undefined;
+        controller._cancelAlgorithm = undefined;
+    }
+    // A client of ReadableByteStreamController may use these functions directly to bypass state check.
+    function ReadableByteStreamControllerClose(controller) {
+        var stream = controller._controlledReadableByteStream;
+        if (controller._closeRequested || stream._state !== 'readable') {
+            return;
+        }
+        if (controller._queueTotalSize > 0) {
+            controller._closeRequested = true;
+            return;
+        }
+        if (controller._pendingPullIntos.length > 0) {
+            var firstPendingPullInto = controller._pendingPullIntos.peek();
+            if (firstPendingPullInto.bytesFilled > 0) {
+                var e = new TypeError('Insufficient bytes to fill elements in the given buffer');
+                ReadableByteStreamControllerError(controller, e);
+                throw e;
+            }
+        }
+        ReadableByteStreamControllerClearAlgorithms(controller);
+        ReadableStreamClose(stream);
+    }
+    function ReadableByteStreamControllerEnqueue(controller, chunk) {
+        var stream = controller._controlledReadableByteStream;
+        if (controller._closeRequested || stream._state !== 'readable') {
+            return;
+        }
+        var buffer = chunk.buffer;
+        var byteOffset = chunk.byteOffset;
+        var byteLength = chunk.byteLength;
+        var transferredBuffer = TransferArrayBuffer(buffer);
+        if (controller._pendingPullIntos.length > 0) {
+            var firstPendingPullInto = controller._pendingPullIntos.peek();
+            if (IsDetachedBuffer(firstPendingPullInto.buffer)) ;
+            firstPendingPullInto.buffer = TransferArrayBuffer(firstPendingPullInto.buffer);
+        }
+        ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+        if (ReadableStreamHasDefaultReader(stream)) {
+            if (ReadableStreamGetNumReadRequests(stream) === 0) {
+                ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+            }
+            else {
+                if (controller._pendingPullIntos.length > 0) {
+                    ReadableByteStreamControllerShiftPendingPullInto(controller);
+                }
+                var transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength);
+                ReadableStreamFulfillReadRequest(stream, transferredView, false);
+            }
+        }
+        else if (ReadableStreamHasBYOBReader(stream)) {
+            // TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully.
+            ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+            ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);
+        }
+        else {
+            ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+        }
+        ReadableByteStreamControllerCallPullIfNeeded(controller);
+    }
+    function ReadableByteStreamControllerError(controller, e) {
+        var stream = controller._controlledReadableByteStream;
+        if (stream._state !== 'readable') {
+            return;
+        }
+        ReadableByteStreamControllerClearPendingPullIntos(controller);
+        ResetQueue(controller);
+        ReadableByteStreamControllerClearAlgorithms(controller);
+        ReadableStreamError(stream, e);
+    }
+    function ReadableByteStreamControllerGetBYOBRequest(controller) {
+        if (controller._byobRequest === null && controller._pendingPullIntos.length > 0) {
+            var firstDescriptor = controller._pendingPullIntos.peek();
+            var view = new Uint8Array(firstDescriptor.buffer, firstDescriptor.byteOffset + firstDescriptor.bytesFilled, firstDescriptor.byteLength - firstDescriptor.bytesFilled);
+            var byobRequest = Object.create(ReadableStreamBYOBRequest.prototype);
+            SetUpReadableStreamBYOBRequest(byobRequest, controller, view);
+            controller._byobRequest = byobRequest;
+        }
+        return controller._byobRequest;
+    }
+    function ReadableByteStreamControllerGetDesiredSize(controller) {
+        var state = controller._controlledReadableByteStream._state;
+        if (state === 'errored') {
+            return null;
+        }
+        if (state === 'closed') {
+            return 0;
+        }
+        return controller._strategyHWM - controller._queueTotalSize;
+    }
+    function ReadableByteStreamControllerRespond(controller, bytesWritten) {
+        var firstDescriptor = controller._pendingPullIntos.peek();
+        var state = controller._controlledReadableByteStream._state;
+        if (state === 'closed') {
+            if (bytesWritten !== 0) {
+                throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream');
+            }
+        }
+        else {
+            if (bytesWritten === 0) {
+                throw new TypeError('bytesWritten must be greater than 0 when calling respond() on a readable stream');
+            }
+            if (firstDescriptor.bytesFilled + bytesWritten > firstDescriptor.byteLength) {
+                throw new RangeError('bytesWritten out of range');
+            }
+        }
+        firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer);
+        ReadableByteStreamControllerRespondInternal(controller, bytesWritten);
+    }
+    function ReadableByteStreamControllerRespondWithNewView(controller, view) {
+        var firstDescriptor = controller._pendingPullIntos.peek();
+        var state = controller._controlledReadableByteStream._state;
+        if (state === 'closed') {
+            if (view.byteLength !== 0) {
+                throw new TypeError('The view\'s length must be 0 when calling respondWithNewView() on a closed stream');
+            }
+        }
+        else {
+            if (view.byteLength === 0) {
+                throw new TypeError('The view\'s length must be greater than 0 when calling respondWithNewView() on a readable stream');
+            }
+        }
+        if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) {
+            throw new RangeError('The region specified by view does not match byobRequest');
+        }
+        if (firstDescriptor.bufferByteLength !== view.buffer.byteLength) {
+            throw new RangeError('The buffer of view has different capacity than byobRequest');
+        }
+        if (firstDescriptor.bytesFilled + view.byteLength > firstDescriptor.byteLength) {
+            throw new RangeError('The region specified by view is larger than byobRequest');
+        }
+        var viewByteLength = view.byteLength;
+        firstDescriptor.buffer = TransferArrayBuffer(view.buffer);
+        ReadableByteStreamControllerRespondInternal(controller, viewByteLength);
+    }
+    function SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize) {
+        controller._controlledReadableByteStream = stream;
+        controller._pullAgain = false;
+        controller._pulling = false;
+        controller._byobRequest = null;
+        // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.
+        controller._queue = controller._queueTotalSize = undefined;
+        ResetQueue(controller);
+        controller._closeRequested = false;
+        controller._started = false;
+        controller._strategyHWM = highWaterMark;
+        controller._pullAlgorithm = pullAlgorithm;
+        controller._cancelAlgorithm = cancelAlgorithm;
+        controller._autoAllocateChunkSize = autoAllocateChunkSize;
+        controller._pendingPullIntos = new SimpleQueue();
+        stream._readableStreamController = controller;
+        var startResult = startAlgorithm();
+        uponPromise(promiseResolvedWith(startResult), function () {
+            controller._started = true;
+            ReadableByteStreamControllerCallPullIfNeeded(controller);
+        }, function (r) {
+            ReadableByteStreamControllerError(controller, r);
+        });
+    }
+    function SetUpReadableByteStreamControllerFromUnderlyingSource(stream, underlyingByteSource, highWaterMark) {
+        var controller = Object.create(ReadableByteStreamController.prototype);
+        var startAlgorithm = function () { return undefined; };
+        var pullAlgorithm = function () { return promiseResolvedWith(undefined); };
+        var cancelAlgorithm = function () { return promiseResolvedWith(undefined); };
+        if (underlyingByteSource.start !== undefined) {
+            startAlgorithm = function () { return underlyingByteSource.start(controller); };
+        }
+        if (underlyingByteSource.pull !== undefined) {
+            pullAlgorithm = function () { return underlyingByteSource.pull(controller); };
+        }
+        if (underlyingByteSource.cancel !== undefined) {
+            cancelAlgorithm = function (reason) { return underlyingByteSource.cancel(reason); };
+        }
+        var autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;
+        if (autoAllocateChunkSize === 0) {
+            throw new TypeError('autoAllocateChunkSize must be greater than 0');
+        }
+        SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize);
+    }
+    function SetUpReadableStreamBYOBRequest(request, controller, view) {
+        request._associatedReadableByteStreamController = controller;
+        request._view = view;
+    }
+    // Helper functions for the ReadableStreamBYOBRequest.
+    function byobRequestBrandCheckException(name) {
+        return new TypeError("ReadableStreamBYOBRequest.prototype." + name + " can only be used on a ReadableStreamBYOBRequest");
+    }
+    // Helper functions for the ReadableByteStreamController.
+    function byteStreamControllerBrandCheckException(name) {
+        return new TypeError("ReadableByteStreamController.prototype." + name + " can only be used on a ReadableByteStreamController");
+    }
+
+    // Abstract operations for the ReadableStream.
+    function AcquireReadableStreamBYOBReader(stream) {
+        return new ReadableStreamBYOBReader(stream);
+    }
+    // ReadableStream API exposed for controllers.
+    function ReadableStreamAddReadIntoRequest(stream, readIntoRequest) {
+        stream._reader._readIntoRequests.push(readIntoRequest);
+    }
+    function ReadableStreamFulfillReadIntoRequest(stream, chunk, done) {
+        var reader = stream._reader;
+        var readIntoRequest = reader._readIntoRequests.shift();
+        if (done) {
+            readIntoRequest._closeSteps(chunk);
+        }
+        else {
+            readIntoRequest._chunkSteps(chunk);
+        }
+    }
+    function ReadableStreamGetNumReadIntoRequests(stream) {
+        return stream._reader._readIntoRequests.length;
+    }
+    function ReadableStreamHasBYOBReader(stream) {
+        var reader = stream._reader;
+        if (reader === undefined) {
+            return false;
+        }
+        if (!IsReadableStreamBYOBReader(reader)) {
+            return false;
+        }
+        return true;
+    }
+    /**
+     * A BYOB reader vended by a {@link ReadableStream}.
+     *
+     * @public
+     */
+    var ReadableStreamBYOBReader = /** @class */ (function () {
+        function ReadableStreamBYOBReader(stream) {
+            assertRequiredArgument(stream, 1, 'ReadableStreamBYOBReader');
+            assertReadableStream(stream, 'First parameter');
+            if (IsReadableStreamLocked(stream)) {
+                throw new TypeError('This stream has already been locked for exclusive reading by another reader');
+            }
+            if (!IsReadableByteStreamController(stream._readableStreamController)) {
+                throw new TypeError('Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte ' +
+                    'source');
+            }
+            ReadableStreamReaderGenericInitialize(this, stream);
+            this._readIntoRequests = new SimpleQueue();
+        }
+        Object.defineProperty(ReadableStreamBYOBReader.prototype, "closed", {
+            /**
+             * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or
+             * the reader's lock is released before the stream finishes closing.
+             */
+            get: function () {
+                if (!IsReadableStreamBYOBReader(this)) {
+                    return promiseRejectedWith(byobReaderBrandCheckException('closed'));
+                }
+                return this._closedPromise;
+            },
+            enumerable: false,
+            configurable: true
+        });
+        /**
+         * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.
+         */
+        ReadableStreamBYOBReader.prototype.cancel = function (reason) {
+            if (reason === void 0) { reason = undefined; }
+            if (!IsReadableStreamBYOBReader(this)) {
+                return promiseRejectedWith(byobReaderBrandCheckException('cancel'));
+            }
+            if (this._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('cancel'));
+            }
+            return ReadableStreamReaderGenericCancel(this, reason);
+        };
+        /**
+         * Attempts to reads bytes into view, and returns a promise resolved with the result.
+         *
+         * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.
+         */
+        ReadableStreamBYOBReader.prototype.read = function (view) {
+            if (!IsReadableStreamBYOBReader(this)) {
+                return promiseRejectedWith(byobReaderBrandCheckException('read'));
+            }
+            if (!ArrayBuffer.isView(view)) {
+                return promiseRejectedWith(new TypeError('view must be an array buffer view'));
+            }
+            if (view.byteLength === 0) {
+                return promiseRejectedWith(new TypeError('view must have non-zero byteLength'));
+            }
+            if (view.buffer.byteLength === 0) {
+                return promiseRejectedWith(new TypeError("view's buffer must have non-zero byteLength"));
+            }
+            if (IsDetachedBuffer(view.buffer)) ;
+            if (this._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('read from'));
+            }
+            var resolvePromise;
+            var rejectPromise;
+            var promise = newPromise(function (resolve, reject) {
+                resolvePromise = resolve;
+                rejectPromise = reject;
+            });
+            var readIntoRequest = {
+                _chunkSteps: function (chunk) { return resolvePromise({ value: chunk, done: false }); },
+                _closeSteps: function (chunk) { return resolvePromise({ value: chunk, done: true }); },
+                _errorSteps: function (e) { return rejectPromise(e); }
+            };
+            ReadableStreamBYOBReaderRead(this, view, readIntoRequest);
+            return promise;
+        };
+        /**
+         * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.
+         * If the associated stream is errored when the lock is released, the reader will appear errored in the same way
+         * from now on; otherwise, the reader will appear closed.
+         *
+         * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by
+         * the reader's {@link ReadableStreamBYOBReader.read | read()} method has not yet been settled. Attempting to
+         * do so will throw a `TypeError` and leave the reader locked to the stream.
+         */
+        ReadableStreamBYOBReader.prototype.releaseLock = function () {
+            if (!IsReadableStreamBYOBReader(this)) {
+                throw byobReaderBrandCheckException('releaseLock');
+            }
+            if (this._ownerReadableStream === undefined) {
+                return;
+            }
+            if (this._readIntoRequests.length > 0) {
+                throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');
+            }
+            ReadableStreamReaderGenericRelease(this);
+        };
+        return ReadableStreamBYOBReader;
+    }());
+    Object.defineProperties(ReadableStreamBYOBReader.prototype, {
+        cancel: { enumerable: true },
+        read: { enumerable: true },
+        releaseLock: { enumerable: true },
+        closed: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableStreamBYOBReader.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableStreamBYOBReader',
+            configurable: true
+        });
+    }
+    // Abstract operations for the readers.
+    function IsReadableStreamBYOBReader(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_readIntoRequests')) {
+            return false;
+        }
+        return x instanceof ReadableStreamBYOBReader;
+    }
+    function ReadableStreamBYOBReaderRead(reader, view, readIntoRequest) {
+        var stream = reader._ownerReadableStream;
+        stream._disturbed = true;
+        if (stream._state === 'errored') {
+            readIntoRequest._errorSteps(stream._storedError);
+        }
+        else {
+            ReadableByteStreamControllerPullInto(stream._readableStreamController, view, readIntoRequest);
+        }
+    }
+    // Helper functions for the ReadableStreamBYOBReader.
+    function byobReaderBrandCheckException(name) {
+        return new TypeError("ReadableStreamBYOBReader.prototype." + name + " can only be used on a ReadableStreamBYOBReader");
+    }
+
+    function ExtractHighWaterMark(strategy, defaultHWM) {
+        var highWaterMark = strategy.highWaterMark;
+        if (highWaterMark === undefined) {
+            return defaultHWM;
+        }
+        if (NumberIsNaN(highWaterMark) || highWaterMark < 0) {
+            throw new RangeError('Invalid highWaterMark');
+        }
+        return highWaterMark;
+    }
+    function ExtractSizeAlgorithm(strategy) {
+        var size = strategy.size;
+        if (!size) {
+            return function () { return 1; };
+        }
+        return size;
+    }
+
+    function convertQueuingStrategy(init, context) {
+        assertDictionary(init, context);
+        var highWaterMark = init === null || init === void 0 ? void 0 : init.highWaterMark;
+        var size = init === null || init === void 0 ? void 0 : init.size;
+        return {
+            highWaterMark: highWaterMark === undefined ? undefined : convertUnrestrictedDouble(highWaterMark),
+            size: size === undefined ? undefined : convertQueuingStrategySize(size, context + " has member 'size' that")
+        };
+    }
+    function convertQueuingStrategySize(fn, context) {
+        assertFunction(fn, context);
+        return function (chunk) { return convertUnrestrictedDouble(fn(chunk)); };
+    }
+
+    function convertUnderlyingSink(original, context) {
+        assertDictionary(original, context);
+        var abort = original === null || original === void 0 ? void 0 : original.abort;
+        var close = original === null || original === void 0 ? void 0 : original.close;
+        var start = original === null || original === void 0 ? void 0 : original.start;
+        var type = original === null || original === void 0 ? void 0 : original.type;
+        var write = original === null || original === void 0 ? void 0 : original.write;
+        return {
+            abort: abort === undefined ?
+                undefined :
+                convertUnderlyingSinkAbortCallback(abort, original, context + " has member 'abort' that"),
+            close: close === undefined ?
+                undefined :
+                convertUnderlyingSinkCloseCallback(close, original, context + " has member 'close' that"),
+            start: start === undefined ?
+                undefined :
+                convertUnderlyingSinkStartCallback(start, original, context + " has member 'start' that"),
+            write: write === undefined ?
+                undefined :
+                convertUnderlyingSinkWriteCallback(write, original, context + " has member 'write' that"),
+            type: type
+        };
+    }
+    function convertUnderlyingSinkAbortCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return function (reason) { return promiseCall(fn, original, [reason]); };
+    }
+    function convertUnderlyingSinkCloseCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return function () { return promiseCall(fn, original, []); };
+    }
+    function convertUnderlyingSinkStartCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return function (controller) { return reflectCall(fn, original, [controller]); };
+    }
+    function convertUnderlyingSinkWriteCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return function (chunk, controller) { return promiseCall(fn, original, [chunk, controller]); };
+    }
+
+    function assertWritableStream(x, context) {
+        if (!IsWritableStream(x)) {
+            throw new TypeError(context + " is not a WritableStream.");
+        }
+    }
+
+    function isAbortSignal(value) {
+        if (typeof value !== 'object' || value === null) {
+            return false;
+        }
+        try {
+            return typeof value.aborted === 'boolean';
+        }
+        catch (_a) {
+            // AbortSignal.prototype.aborted throws if its brand check fails
+            return false;
+        }
+    }
+    var supportsAbortController = typeof AbortController === 'function';
+    /**
+     * Construct a new AbortController, if supported by the platform.
+     *
+     * @internal
+     */
+    function createAbortController() {
+        if (supportsAbortController) {
+            return new AbortController();
+        }
+        return undefined;
+    }
+
+    /**
+     * A writable stream represents a destination for data, into which you can write.
+     *
+     * @public
+     */
+    var WritableStream = /** @class */ (function () {
+        function WritableStream(rawUnderlyingSink, rawStrategy) {
+            if (rawUnderlyingSink === void 0) { rawUnderlyingSink = {}; }
+            if (rawStrategy === void 0) { rawStrategy = {}; }
+            if (rawUnderlyingSink === undefined) {
+                rawUnderlyingSink = null;
+            }
+            else {
+                assertObject(rawUnderlyingSink, 'First parameter');
+            }
+            var strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');
+            var underlyingSink = convertUnderlyingSink(rawUnderlyingSink, 'First parameter');
+            InitializeWritableStream(this);
+            var type = underlyingSink.type;
+            if (type !== undefined) {
+                throw new RangeError('Invalid type is specified');
+            }
+            var sizeAlgorithm = ExtractSizeAlgorithm(strategy);
+            var highWaterMark = ExtractHighWaterMark(strategy, 1);
+            SetUpWritableStreamDefaultControllerFromUnderlyingSink(this, underlyingSink, highWaterMark, sizeAlgorithm);
+        }
+        Object.defineProperty(WritableStream.prototype, "locked", {
+            /**
+             * Returns whether or not the writable stream is locked to a writer.
+             */
+            get: function () {
+                if (!IsWritableStream(this)) {
+                    throw streamBrandCheckException$2('locked');
+                }
+                return IsWritableStreamLocked(this);
+            },
+            enumerable: false,
+            configurable: true
+        });
+        /**
+         * Aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be
+         * immediately moved to an errored state, with any queued-up writes discarded. This will also execute any abort
+         * mechanism of the underlying sink.
+         *
+         * The returned promise will fulfill if the stream shuts down successfully, or reject if the underlying sink signaled
+         * that there was an error doing so. Additionally, it will reject with a `TypeError` (without attempting to cancel
+         * the stream) if the stream is currently locked.
+         */
+        WritableStream.prototype.abort = function (reason) {
+            if (reason === void 0) { reason = undefined; }
+            if (!IsWritableStream(this)) {
+                return promiseRejectedWith(streamBrandCheckException$2('abort'));
+            }
+            if (IsWritableStreamLocked(this)) {
+                return promiseRejectedWith(new TypeError('Cannot abort a stream that already has a writer'));
+            }
+            return WritableStreamAbort(this, reason);
+        };
+        /**
+         * Closes the stream. The underlying sink will finish processing any previously-written chunks, before invoking its
+         * close behavior. During this time any further attempts to write will fail (without erroring the stream).
+         *
+         * The method returns a promise that will fulfill if all remaining chunks are successfully written and the stream
+         * successfully closes, or rejects if an error is encountered during this process. Additionally, it will reject with
+         * a `TypeError` (without attempting to cancel the stream) if the stream is currently locked.
+         */
+        WritableStream.prototype.close = function () {
+            if (!IsWritableStream(this)) {
+                return promiseRejectedWith(streamBrandCheckException$2('close'));
+            }
+            if (IsWritableStreamLocked(this)) {
+                return promiseRejectedWith(new TypeError('Cannot close a stream that already has a writer'));
+            }
+            if (WritableStreamCloseQueuedOrInFlight(this)) {
+                return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));
+            }
+            return WritableStreamClose(this);
+        };
+        /**
+         * Creates a {@link WritableStreamDefaultWriter | writer} and locks the stream to the new writer. While the stream
+         * is locked, no other writer can be acquired until this one is released.
+         *
+         * This functionality is especially useful for creating abstractions that desire the ability to write to a stream
+         * without interruption or interleaving. By getting a writer for the stream, you can ensure nobody else can write at
+         * the same time, which would cause the resulting written data to be unpredictable and probably useless.
+         */
+        WritableStream.prototype.getWriter = function () {
+            if (!IsWritableStream(this)) {
+                throw streamBrandCheckException$2('getWriter');
+            }
+            return AcquireWritableStreamDefaultWriter(this);
+        };
+        return WritableStream;
+    }());
+    Object.defineProperties(WritableStream.prototype, {
+        abort: { enumerable: true },
+        close: { enumerable: true },
+        getWriter: { enumerable: true },
+        locked: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(WritableStream.prototype, SymbolPolyfill.toStringTag, {
+            value: 'WritableStream',
+            configurable: true
+        });
+    }
+    // Abstract operations for the WritableStream.
+    function AcquireWritableStreamDefaultWriter(stream) {
+        return new WritableStreamDefaultWriter(stream);
+    }
+    // Throws if and only if startAlgorithm throws.
+    function CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm) {
+        if (highWaterMark === void 0) { highWaterMark = 1; }
+        if (sizeAlgorithm === void 0) { sizeAlgorithm = function () { return 1; }; }
+        var stream = Object.create(WritableStream.prototype);
+        InitializeWritableStream(stream);
+        var controller = Object.create(WritableStreamDefaultController.prototype);
+        SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm);
+        return stream;
+    }
+    function InitializeWritableStream(stream) {
+        stream._state = 'writable';
+        // The error that will be reported by new method calls once the state becomes errored. Only set when [[state]] is
+        // 'erroring' or 'errored'. May be set to an undefined value.
+        stream._storedError = undefined;
+        stream._writer = undefined;
+        // Initialize to undefined first because the constructor of the controller checks this
+        // variable to validate the caller.
+        stream._writableStreamController = undefined;
+        // This queue is placed here instead of the writer class in order to allow for passing a writer to the next data
+        // producer without waiting for the queued writes to finish.
+        stream._writeRequests = new SimpleQueue();
+        // Write requests are removed from _writeRequests when write() is called on the underlying sink. This prevents
+        // them from being erroneously rejected on error. If a write() call is in-flight, the request is stored here.
+        stream._inFlightWriteRequest = undefined;
+        // The promise that was returned from writer.close(). Stored here because it may be fulfilled after the writer
+        // has been detached.
+        stream._closeRequest = undefined;
+        // Close request is removed from _closeRequest when close() is called on the underlying sink. This prevents it
+        // from being erroneously rejected on error. If a close() call is in-flight, the request is stored here.
+        stream._inFlightCloseRequest = undefined;
+        // The promise that was returned from writer.abort(). This may also be fulfilled after the writer has detached.
+        stream._pendingAbortRequest = undefined;
+        // The backpressure signal set by the controller.
+        stream._backpressure = false;
+    }
+    function IsWritableStream(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_writableStreamController')) {
+            return false;
+        }
+        return x instanceof WritableStream;
+    }
+    function IsWritableStreamLocked(stream) {
+        if (stream._writer === undefined) {
+            return false;
+        }
+        return true;
+    }
+    function WritableStreamAbort(stream, reason) {
+        var _a;
+        if (stream._state === 'closed' || stream._state === 'errored') {
+            return promiseResolvedWith(undefined);
+        }
+        stream._writableStreamController._abortReason = reason;
+        (_a = stream._writableStreamController._abortController) === null || _a === void 0 ? void 0 : _a.abort();
+        // TypeScript narrows the type of `stream._state` down to 'writable' | 'erroring',
+        // but it doesn't know that signaling abort runs author code that might have changed the state.
+        // Widen the type again by casting to WritableStreamState.
+        var state = stream._state;
+        if (state === 'closed' || state === 'errored') {
+            return promiseResolvedWith(undefined);
+        }
+        if (stream._pendingAbortRequest !== undefined) {
+            return stream._pendingAbortRequest._promise;
+        }
+        var wasAlreadyErroring = false;
+        if (state === 'erroring') {
+            wasAlreadyErroring = true;
+            // reason will not be used, so don't keep a reference to it.
+            reason = undefined;
+        }
+        var promise = newPromise(function (resolve, reject) {
+            stream._pendingAbortRequest = {
+                _promise: undefined,
+                _resolve: resolve,
+                _reject: reject,
+                _reason: reason,
+                _wasAlreadyErroring: wasAlreadyErroring
+            };
+        });
+        stream._pendingAbortRequest._promise = promise;
+        if (!wasAlreadyErroring) {
+            WritableStreamStartErroring(stream, reason);
+        }
+        return promise;
+    }
+    function WritableStreamClose(stream) {
+        var state = stream._state;
+        if (state === 'closed' || state === 'errored') {
+            return promiseRejectedWith(new TypeError("The stream (in " + state + " state) is not in the writable state and cannot be closed"));
+        }
+        var promise = newPromise(function (resolve, reject) {
+            var closeRequest = {
+                _resolve: resolve,
+                _reject: reject
+            };
+            stream._closeRequest = closeRequest;
+        });
+        var writer = stream._writer;
+        if (writer !== undefined && stream._backpressure && state === 'writable') {
+            defaultWriterReadyPromiseResolve(writer);
+        }
+        WritableStreamDefaultControllerClose(stream._writableStreamController);
+        return promise;
+    }
+    // WritableStream API exposed for controllers.
+    function WritableStreamAddWriteRequest(stream) {
+        var promise = newPromise(function (resolve, reject) {
+            var writeRequest = {
+                _resolve: resolve,
+                _reject: reject
+            };
+            stream._writeRequests.push(writeRequest);
+        });
+        return promise;
+    }
+    function WritableStreamDealWithRejection(stream, error) {
+        var state = stream._state;
+        if (state === 'writable') {
+            WritableStreamStartErroring(stream, error);
+            return;
+        }
+        WritableStreamFinishErroring(stream);
+    }
+    function WritableStreamStartErroring(stream, reason) {
+        var controller = stream._writableStreamController;
+        stream._state = 'erroring';
+        stream._storedError = reason;
+        var writer = stream._writer;
+        if (writer !== undefined) {
+            WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);
+        }
+        if (!WritableStreamHasOperationMarkedInFlight(stream) && controller._started) {
+            WritableStreamFinishErroring(stream);
+        }
+    }
+    function WritableStreamFinishErroring(stream) {
+        stream._state = 'errored';
+        stream._writableStreamController[ErrorSteps]();
+        var storedError = stream._storedError;
+        stream._writeRequests.forEach(function (writeRequest) {
+            writeRequest._reject(storedError);
+        });
+        stream._writeRequests = new SimpleQueue();
+        if (stream._pendingAbortRequest === undefined) {
+            WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+            return;
+        }
+        var abortRequest = stream._pendingAbortRequest;
+        stream._pendingAbortRequest = undefined;
+        if (abortRequest._wasAlreadyErroring) {
+            abortRequest._reject(storedError);
+            WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+            return;
+        }
+        var promise = stream._writableStreamController[AbortSteps](abortRequest._reason);
+        uponPromise(promise, function () {
+            abortRequest._resolve();
+            WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+        }, function (reason) {
+            abortRequest._reject(reason);
+            WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+        });
+    }
+    function WritableStreamFinishInFlightWrite(stream) {
+        stream._inFlightWriteRequest._resolve(undefined);
+        stream._inFlightWriteRequest = undefined;
+    }
+    function WritableStreamFinishInFlightWriteWithError(stream, error) {
+        stream._inFlightWriteRequest._reject(error);
+        stream._inFlightWriteRequest = undefined;
+        WritableStreamDealWithRejection(stream, error);
+    }
+    function WritableStreamFinishInFlightClose(stream) {
+        stream._inFlightCloseRequest._resolve(undefined);
+        stream._inFlightCloseRequest = undefined;
+        var state = stream._state;
+        if (state === 'erroring') {
+            // The error was too late to do anything, so it is ignored.
+            stream._storedError = undefined;
+            if (stream._pendingAbortRequest !== undefined) {
+                stream._pendingAbortRequest._resolve();
+                stream._pendingAbortRequest = undefined;
+            }
+        }
+        stream._state = 'closed';
+        var writer = stream._writer;
+        if (writer !== undefined) {
+            defaultWriterClosedPromiseResolve(writer);
+        }
+    }
+    function WritableStreamFinishInFlightCloseWithError(stream, error) {
+        stream._inFlightCloseRequest._reject(error);
+        stream._inFlightCloseRequest = undefined;
+        // Never execute sink abort() after sink close().
+        if (stream._pendingAbortRequest !== undefined) {
+            stream._pendingAbortRequest._reject(error);
+            stream._pendingAbortRequest = undefined;
+        }
+        WritableStreamDealWithRejection(stream, error);
+    }
+    // TODO(ricea): Fix alphabetical order.
+    function WritableStreamCloseQueuedOrInFlight(stream) {
+        if (stream._closeRequest === undefined && stream._inFlightCloseRequest === undefined) {
+            return false;
+        }
+        return true;
+    }
+    function WritableStreamHasOperationMarkedInFlight(stream) {
+        if (stream._inFlightWriteRequest === undefined && stream._inFlightCloseRequest === undefined) {
+            return false;
+        }
+        return true;
+    }
+    function WritableStreamMarkCloseRequestInFlight(stream) {
+        stream._inFlightCloseRequest = stream._closeRequest;
+        stream._closeRequest = undefined;
+    }
+    function WritableStreamMarkFirstWriteRequestInFlight(stream) {
+        stream._inFlightWriteRequest = stream._writeRequests.shift();
+    }
+    function WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream) {
+        if (stream._closeRequest !== undefined) {
+            stream._closeRequest._reject(stream._storedError);
+            stream._closeRequest = undefined;
+        }
+        var writer = stream._writer;
+        if (writer !== undefined) {
+            defaultWriterClosedPromiseReject(writer, stream._storedError);
+        }
+    }
+    function WritableStreamUpdateBackpressure(stream, backpressure) {
+        var writer = stream._writer;
+        if (writer !== undefined && backpressure !== stream._backpressure) {
+            if (backpressure) {
+                defaultWriterReadyPromiseReset(writer);
+            }
+            else {
+                defaultWriterReadyPromiseResolve(writer);
+            }
+        }
+        stream._backpressure = backpressure;
+    }
+    /**
+     * A default writer vended by a {@link WritableStream}.
+     *
+     * @public
+     */
+    var WritableStreamDefaultWriter = /** @class */ (function () {
+        function WritableStreamDefaultWriter(stream) {
+            assertRequiredArgument(stream, 1, 'WritableStreamDefaultWriter');
+            assertWritableStream(stream, 'First parameter');
+            if (IsWritableStreamLocked(stream)) {
+                throw new TypeError('This stream has already been locked for exclusive writing by another writer');
+            }
+            this._ownerWritableStream = stream;
+            stream._writer = this;
+            var state = stream._state;
+            if (state === 'writable') {
+                if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._backpressure) {
+                    defaultWriterReadyPromiseInitialize(this);
+                }
+                else {
+                    defaultWriterReadyPromiseInitializeAsResolved(this);
+                }
+                defaultWriterClosedPromiseInitialize(this);
+            }
+            else if (state === 'erroring') {
+                defaultWriterReadyPromiseInitializeAsRejected(this, stream._storedError);
+                defaultWriterClosedPromiseInitialize(this);
+            }
+            else if (state === 'closed') {
+                defaultWriterReadyPromiseInitializeAsResolved(this);
+                defaultWriterClosedPromiseInitializeAsResolved(this);
+            }
+            else {
+                var storedError = stream._storedError;
+                defaultWriterReadyPromiseInitializeAsRejected(this, storedError);
+                defaultWriterClosedPromiseInitializeAsRejected(this, storedError);
+            }
+        }
+        Object.defineProperty(WritableStreamDefaultWriter.prototype, "closed", {
+            /**
+             * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or
+             * the writer’s lock is released before the stream finishes closing.
+             */
+            get: function () {
+                if (!IsWritableStreamDefaultWriter(this)) {
+                    return promiseRejectedWith(defaultWriterBrandCheckException('closed'));
+                }
+                return this._closedPromise;
+            },
+            enumerable: false,
+            configurable: true
+        });
+        Object.defineProperty(WritableStreamDefaultWriter.prototype, "desiredSize", {
+            /**
+             * Returns the desired size to fill the stream’s internal queue. It can be negative, if the queue is over-full.
+             * A producer can use this information to determine the right amount of data to write.
+             *
+             * It will be `null` if the stream cannot be successfully written to (due to either being errored, or having an abort
+             * queued up). It will return zero if the stream is closed. And the getter will throw an exception if invoked when
+             * the writer’s lock is released.
+             */
+            get: function () {
+                if (!IsWritableStreamDefaultWriter(this)) {
+                    throw defaultWriterBrandCheckException('desiredSize');
+                }
+                if (this._ownerWritableStream === undefined) {
+                    throw defaultWriterLockException('desiredSize');
+                }
+                return WritableStreamDefaultWriterGetDesiredSize(this);
+            },
+            enumerable: false,
+            configurable: true
+        });
+        Object.defineProperty(WritableStreamDefaultWriter.prototype, "ready", {
+            /**
+             * Returns a promise that will be fulfilled when the desired size to fill the stream’s internal queue transitions
+             * from non-positive to positive, signaling that it is no longer applying backpressure. Once the desired size dips
+             * back to zero or below, the getter will return a new promise that stays pending until the next transition.
+             *
+             * If the stream becomes errored or aborted, or the writer’s lock is released, the returned promise will become
+             * rejected.
+             */
+            get: function () {
+                if (!IsWritableStreamDefaultWriter(this)) {
+                    return promiseRejectedWith(defaultWriterBrandCheckException('ready'));
+                }
+                return this._readyPromise;
+            },
+            enumerable: false,
+            configurable: true
+        });
+        /**
+         * If the reader is active, behaves the same as {@link WritableStream.abort | stream.abort(reason)}.
+         */
+        WritableStreamDefaultWriter.prototype.abort = function (reason) {
+            if (reason === void 0) { reason = undefined; }
+            if (!IsWritableStreamDefaultWriter(this)) {
+                return promiseRejectedWith(defaultWriterBrandCheckException('abort'));
+            }
+            if (this._ownerWritableStream === undefined) {
+                return promiseRejectedWith(defaultWriterLockException('abort'));
+            }
+            return WritableStreamDefaultWriterAbort(this, reason);
+        };
+        /**
+         * If the reader is active, behaves the same as {@link WritableStream.close | stream.close()}.
+         */
+        WritableStreamDefaultWriter.prototype.close = function () {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                return promiseRejectedWith(defaultWriterBrandCheckException('close'));
+            }
+            var stream = this._ownerWritableStream;
+            if (stream === undefined) {
+                return promiseRejectedWith(defaultWriterLockException('close'));
+            }
+            if (WritableStreamCloseQueuedOrInFlight(stream)) {
+                return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));
+            }
+            return WritableStreamDefaultWriterClose(this);
+        };
+        /**
+         * Releases the writer’s lock on the corresponding stream. After the lock is released, the writer is no longer active.
+         * If the associated stream is errored when the lock is released, the writer will appear errored in the same way from
+         * now on; otherwise, the writer will appear closed.
+         *
+         * Note that the lock can still be released even if some ongoing writes have not yet finished (i.e. even if the
+         * promises returned from previous calls to {@link WritableStreamDefaultWriter.write | write()} have not yet settled).
+         * It’s not necessary to hold the lock on the writer for the duration of the write; the lock instead simply prevents
+         * other producers from writing in an interleaved manner.
+         */
+        WritableStreamDefaultWriter.prototype.releaseLock = function () {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                throw defaultWriterBrandCheckException('releaseLock');
+            }
+            var stream = this._ownerWritableStream;
+            if (stream === undefined) {
+                return;
+            }
+            WritableStreamDefaultWriterRelease(this);
+        };
+        WritableStreamDefaultWriter.prototype.write = function (chunk) {
+            if (chunk === void 0) { chunk = undefined; }
+            if (!IsWritableStreamDefaultWriter(this)) {
+                return promiseRejectedWith(defaultWriterBrandCheckException('write'));
+            }
+            if (this._ownerWritableStream === undefined) {
+                return promiseRejectedWith(defaultWriterLockException('write to'));
+            }
+            return WritableStreamDefaultWriterWrite(this, chunk);
+        };
+        return WritableStreamDefaultWriter;
+    }());
+    Object.defineProperties(WritableStreamDefaultWriter.prototype, {
+        abort: { enumerable: true },
+        close: { enumerable: true },
+        releaseLock: { enumerable: true },
+        write: { enumerable: true },
+        closed: { enumerable: true },
+        desiredSize: { enumerable: true },
+        ready: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(WritableStreamDefaultWriter.prototype, SymbolPolyfill.toStringTag, {
+            value: 'WritableStreamDefaultWriter',
+            configurable: true
+        });
+    }
+    // Abstract operations for the WritableStreamDefaultWriter.
+    function IsWritableStreamDefaultWriter(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) {
+            return false;
+        }
+        return x instanceof WritableStreamDefaultWriter;
+    }
+    // A client of WritableStreamDefaultWriter may use these functions directly to bypass state check.
+    function WritableStreamDefaultWriterAbort(writer, reason) {
+        var stream = writer._ownerWritableStream;
+        return WritableStreamAbort(stream, reason);
+    }
+    function WritableStreamDefaultWriterClose(writer) {
+        var stream = writer._ownerWritableStream;
+        return WritableStreamClose(stream);
+    }
+    function WritableStreamDefaultWriterCloseWithErrorPropagation(writer) {
+        var stream = writer._ownerWritableStream;
+        var state = stream._state;
+        if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {
+            return promiseResolvedWith(undefined);
+        }
+        if (state === 'errored') {
+            return promiseRejectedWith(stream._storedError);
+        }
+        return WritableStreamDefaultWriterClose(writer);
+    }
+    function WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, error) {
+        if (writer._closedPromiseState === 'pending') {
+            defaultWriterClosedPromiseReject(writer, error);
+        }
+        else {
+            defaultWriterClosedPromiseResetToRejected(writer, error);
+        }
+    }
+    function WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, error) {
+        if (writer._readyPromiseState === 'pending') {
+            defaultWriterReadyPromiseReject(writer, error);
+        }
+        else {
+            defaultWriterReadyPromiseResetToRejected(writer, error);
+        }
+    }
+    function WritableStreamDefaultWriterGetDesiredSize(writer) {
+        var stream = writer._ownerWritableStream;
+        var state = stream._state;
+        if (state === 'errored' || state === 'erroring') {
+            return null;
+        }
+        if (state === 'closed') {
+            return 0;
+        }
+        return WritableStreamDefaultControllerGetDesiredSize(stream._writableStreamController);
+    }
+    function WritableStreamDefaultWriterRelease(writer) {
+        var stream = writer._ownerWritableStream;
+        var releasedError = new TypeError("Writer was released and can no longer be used to monitor the stream's closedness");
+        WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, releasedError);
+        // The state transitions to "errored" before the sink abort() method runs, but the writer.closed promise is not
+        // rejected until afterwards. This means that simply testing state will not work.
+        WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, releasedError);
+        stream._writer = undefined;
+        writer._ownerWritableStream = undefined;
+    }
+    function WritableStreamDefaultWriterWrite(writer, chunk) {
+        var stream = writer._ownerWritableStream;
+        var controller = stream._writableStreamController;
+        var chunkSize = WritableStreamDefaultControllerGetChunkSize(controller, chunk);
+        if (stream !== writer._ownerWritableStream) {
+            return promiseRejectedWith(defaultWriterLockException('write to'));
+        }
+        var state = stream._state;
+        if (state === 'errored') {
+            return promiseRejectedWith(stream._storedError);
+        }
+        if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {
+            return promiseRejectedWith(new TypeError('The stream is closing or closed and cannot be written to'));
+        }
+        if (state === 'erroring') {
+            return promiseRejectedWith(stream._storedError);
+        }
+        var promise = WritableStreamAddWriteRequest(stream);
+        WritableStreamDefaultControllerWrite(controller, chunk, chunkSize);
+        return promise;
+    }
+    var closeSentinel = {};
+    /**
+     * Allows control of a {@link WritableStream | writable stream}'s state and internal queue.
+     *
+     * @public
+     */
+    var WritableStreamDefaultController = /** @class */ (function () {
+        function WritableStreamDefaultController() {
+            throw new TypeError('Illegal constructor');
+        }
+        Object.defineProperty(WritableStreamDefaultController.prototype, "abortReason", {
+            /**
+             * The reason which was passed to `WritableStream.abort(reason)` when the stream was aborted.
+             *
+             * @deprecated
+             *  This property has been removed from the specification, see https://github.com/whatwg/streams/pull/1177.
+             *  Use {@link WritableStreamDefaultController.signal}'s `reason` instead.
+             */
+            get: function () {
+                if (!IsWritableStreamDefaultController(this)) {
+                    throw defaultControllerBrandCheckException$2('abortReason');
+                }
+                return this._abortReason;
+            },
+            enumerable: false,
+            configurable: true
+        });
+        Object.defineProperty(WritableStreamDefaultController.prototype, "signal", {
+            /**
+             * An `AbortSignal` that can be used to abort the pending write or close operation when the stream is aborted.
+             */
+            get: function () {
+                if (!IsWritableStreamDefaultController(this)) {
+                    throw defaultControllerBrandCheckException$2('signal');
+                }
+                if (this._abortController === undefined) {
+                    // Older browsers or older Node versions may not support `AbortController` or `AbortSignal`.
+                    // We don't want to bundle and ship an `AbortController` polyfill together with our polyfill,
+                    // so instead we only implement support for `signal` if we find a global `AbortController` constructor.
+                    throw new TypeError('WritableStreamDefaultController.prototype.signal is not supported');
+                }
+                return this._abortController.signal;
+            },
+            enumerable: false,
+            configurable: true
+        });
+        /**
+         * Closes the controlled writable stream, making all future interactions with it fail with the given error `e`.
+         *
+         * This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying
+         * sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the
+         * normal lifecycle of interactions with the underlying sink.
+         */
+        WritableStreamDefaultController.prototype.error = function (e) {
+            if (e === void 0) { e = undefined; }
+            if (!IsWritableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$2('error');
+            }
+            var state = this._controlledWritableStream._state;
+            if (state !== 'writable') {
+                // The stream is closed, errored or will be soon. The sink can't do anything useful if it gets an error here, so
+                // just treat it as a no-op.
+                return;
+            }
+            WritableStreamDefaultControllerError(this, e);
+        };
+        /** @internal */
+        WritableStreamDefaultController.prototype[AbortSteps] = function (reason) {
+            var result = this._abortAlgorithm(reason);
+            WritableStreamDefaultControllerClearAlgorithms(this);
+            return result;
+        };
+        /** @internal */
+        WritableStreamDefaultController.prototype[ErrorSteps] = function () {
+            ResetQueue(this);
+        };
+        return WritableStreamDefaultController;
+    }());
+    Object.defineProperties(WritableStreamDefaultController.prototype, {
+        abortReason: { enumerable: true },
+        signal: { enumerable: true },
+        error: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(WritableStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+            value: 'WritableStreamDefaultController',
+            configurable: true
+        });
+    }
+    // Abstract operations implementing interface required by the WritableStream.
+    function IsWritableStreamDefaultController(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_controlledWritableStream')) {
+            return false;
+        }
+        return x instanceof WritableStreamDefaultController;
+    }
+    function SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm) {
+        controller._controlledWritableStream = stream;
+        stream._writableStreamController = controller;
+        // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.
+        controller._queue = undefined;
+        controller._queueTotalSize = undefined;
+        ResetQueue(controller);
+        controller._abortReason = undefined;
+        controller._abortController = createAbortController();
+        controller._started = false;
+        controller._strategySizeAlgorithm = sizeAlgorithm;
+        controller._strategyHWM = highWaterMark;
+        controller._writeAlgorithm = writeAlgorithm;
+        controller._closeAlgorithm = closeAlgorithm;
+        controller._abortAlgorithm = abortAlgorithm;
+        var backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+        WritableStreamUpdateBackpressure(stream, backpressure);
+        var startResult = startAlgorithm();
+        var startPromise = promiseResolvedWith(startResult);
+        uponPromise(startPromise, function () {
+            controller._started = true;
+            WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+        }, function (r) {
+            controller._started = true;
+            WritableStreamDealWithRejection(stream, r);
+        });
+    }
+    function SetUpWritableStreamDefaultControllerFromUnderlyingSink(stream, underlyingSink, highWaterMark, sizeAlgorithm) {
+        var controller = Object.create(WritableStreamDefaultController.prototype);
+        var startAlgorithm = function () { return undefined; };
+        var writeAlgorithm = function () { return promiseResolvedWith(undefined); };
+        var closeAlgorithm = function () { return promiseResolvedWith(undefined); };
+        var abortAlgorithm = function () { return promiseResolvedWith(undefined); };
+        if (underlyingSink.start !== undefined) {
+            startAlgorithm = function () { return underlyingSink.start(controller); };
+        }
+        if (underlyingSink.write !== undefined) {
+            writeAlgorithm = function (chunk) { return underlyingSink.write(chunk, controller); };
+        }
+        if (underlyingSink.close !== undefined) {
+            closeAlgorithm = function () { return underlyingSink.close(); };
+        }
+        if (underlyingSink.abort !== undefined) {
+            abortAlgorithm = function (reason) { return underlyingSink.abort(reason); };
+        }
+        SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm);
+    }
+    // ClearAlgorithms may be called twice. Erroring the same stream in multiple ways will often result in redundant calls.
+    function WritableStreamDefaultControllerClearAlgorithms(controller) {
+        controller._writeAlgorithm = undefined;
+        controller._closeAlgorithm = undefined;
+        controller._abortAlgorithm = undefined;
+        controller._strategySizeAlgorithm = undefined;
+    }
+    function WritableStreamDefaultControllerClose(controller) {
+        EnqueueValueWithSize(controller, closeSentinel, 0);
+        WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+    }
+    function WritableStreamDefaultControllerGetChunkSize(controller, chunk) {
+        try {
+            return controller._strategySizeAlgorithm(chunk);
+        }
+        catch (chunkSizeE) {
+            WritableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE);
+            return 1;
+        }
+    }
+    function WritableStreamDefaultControllerGetDesiredSize(controller) {
+        return controller._strategyHWM - controller._queueTotalSize;
+    }
+    function WritableStreamDefaultControllerWrite(controller, chunk, chunkSize) {
+        try {
+            EnqueueValueWithSize(controller, chunk, chunkSize);
+        }
+        catch (enqueueE) {
+            WritableStreamDefaultControllerErrorIfNeeded(controller, enqueueE);
+            return;
+        }
+        var stream = controller._controlledWritableStream;
+        if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._state === 'writable') {
+            var backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+            WritableStreamUpdateBackpressure(stream, backpressure);
+        }
+        WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+    }
+    // Abstract operations for the WritableStreamDefaultController.
+    function WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller) {
+        var stream = controller._controlledWritableStream;
+        if (!controller._started) {
+            return;
+        }
+        if (stream._inFlightWriteRequest !== undefined) {
+            return;
+        }
+        var state = stream._state;
+        if (state === 'erroring') {
+            WritableStreamFinishErroring(stream);
+            return;
+        }
+        if (controller._queue.length === 0) {
+            return;
+        }
+        var value = PeekQueueValue(controller);
+        if (value === closeSentinel) {
+            WritableStreamDefaultControllerProcessClose(controller);
+        }
+        else {
+            WritableStreamDefaultControllerProcessWrite(controller, value);
+        }
+    }
+    function WritableStreamDefaultControllerErrorIfNeeded(controller, error) {
+        if (controller._controlledWritableStream._state === 'writable') {
+            WritableStreamDefaultControllerError(controller, error);
+        }
+    }
+    function WritableStreamDefaultControllerProcessClose(controller) {
+        var stream = controller._controlledWritableStream;
+        WritableStreamMarkCloseRequestInFlight(stream);
+        DequeueValue(controller);
+        var sinkClosePromise = controller._closeAlgorithm();
+        WritableStreamDefaultControllerClearAlgorithms(controller);
+        uponPromise(sinkClosePromise, function () {
+            WritableStreamFinishInFlightClose(stream);
+        }, function (reason) {
+            WritableStreamFinishInFlightCloseWithError(stream, reason);
+        });
+    }
+    function WritableStreamDefaultControllerProcessWrite(controller, chunk) {
+        var stream = controller._controlledWritableStream;
+        WritableStreamMarkFirstWriteRequestInFlight(stream);
+        var sinkWritePromise = controller._writeAlgorithm(chunk);
+        uponPromise(sinkWritePromise, function () {
+            WritableStreamFinishInFlightWrite(stream);
+            var state = stream._state;
+            DequeueValue(controller);
+            if (!WritableStreamCloseQueuedOrInFlight(stream) && state === 'writable') {
+                var backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+                WritableStreamUpdateBackpressure(stream, backpressure);
+            }
+            WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+        }, function (reason) {
+            if (stream._state === 'writable') {
+                WritableStreamDefaultControllerClearAlgorithms(controller);
+            }
+            WritableStreamFinishInFlightWriteWithError(stream, reason);
+        });
+    }
+    function WritableStreamDefaultControllerGetBackpressure(controller) {
+        var desiredSize = WritableStreamDefaultControllerGetDesiredSize(controller);
+        return desiredSize <= 0;
+    }
+    // A client of WritableStreamDefaultController may use these functions directly to bypass state check.
+    function WritableStreamDefaultControllerError(controller, error) {
+        var stream = controller._controlledWritableStream;
+        WritableStreamDefaultControllerClearAlgorithms(controller);
+        WritableStreamStartErroring(stream, error);
+    }
+    // Helper functions for the WritableStream.
+    function streamBrandCheckException$2(name) {
+        return new TypeError("WritableStream.prototype." + name + " can only be used on a WritableStream");
+    }
+    // Helper functions for the WritableStreamDefaultController.
+    function defaultControllerBrandCheckException$2(name) {
+        return new TypeError("WritableStreamDefaultController.prototype." + name + " can only be used on a WritableStreamDefaultController");
+    }
+    // Helper functions for the WritableStreamDefaultWriter.
+    function defaultWriterBrandCheckException(name) {
+        return new TypeError("WritableStreamDefaultWriter.prototype." + name + " can only be used on a WritableStreamDefaultWriter");
+    }
+    function defaultWriterLockException(name) {
+        return new TypeError('Cannot ' + name + ' a stream using a released writer');
+    }
+    function defaultWriterClosedPromiseInitialize(writer) {
+        writer._closedPromise = newPromise(function (resolve, reject) {
+            writer._closedPromise_resolve = resolve;
+            writer._closedPromise_reject = reject;
+            writer._closedPromiseState = 'pending';
+        });
+    }
+    function defaultWriterClosedPromiseInitializeAsRejected(writer, reason) {
+        defaultWriterClosedPromiseInitialize(writer);
+        defaultWriterClosedPromiseReject(writer, reason);
+    }
+    function defaultWriterClosedPromiseInitializeAsResolved(writer) {
+        defaultWriterClosedPromiseInitialize(writer);
+        defaultWriterClosedPromiseResolve(writer);
+    }
+    function defaultWriterClosedPromiseReject(writer, reason) {
+        if (writer._closedPromise_reject === undefined) {
+            return;
+        }
+        setPromiseIsHandledToTrue(writer._closedPromise);
+        writer._closedPromise_reject(reason);
+        writer._closedPromise_resolve = undefined;
+        writer._closedPromise_reject = undefined;
+        writer._closedPromiseState = 'rejected';
+    }
+    function defaultWriterClosedPromiseResetToRejected(writer, reason) {
+        defaultWriterClosedPromiseInitializeAsRejected(writer, reason);
+    }
+    function defaultWriterClosedPromiseResolve(writer) {
+        if (writer._closedPromise_resolve === undefined) {
+            return;
+        }
+        writer._closedPromise_resolve(undefined);
+        writer._closedPromise_resolve = undefined;
+        writer._closedPromise_reject = undefined;
+        writer._closedPromiseState = 'resolved';
+    }
+    function defaultWriterReadyPromiseInitialize(writer) {
+        writer._readyPromise = newPromise(function (resolve, reject) {
+            writer._readyPromise_resolve = resolve;
+            writer._readyPromise_reject = reject;
+        });
+        writer._readyPromiseState = 'pending';
+    }
+    function defaultWriterReadyPromiseInitializeAsRejected(writer, reason) {
+        defaultWriterReadyPromiseInitialize(writer);
+        defaultWriterReadyPromiseReject(writer, reason);
+    }
+    function defaultWriterReadyPromiseInitializeAsResolved(writer) {
+        defaultWriterReadyPromiseInitialize(writer);
+        defaultWriterReadyPromiseResolve(writer);
+    }
+    function defaultWriterReadyPromiseReject(writer, reason) {
+        if (writer._readyPromise_reject === undefined) {
+            return;
+        }
+        setPromiseIsHandledToTrue(writer._readyPromise);
+        writer._readyPromise_reject(reason);
+        writer._readyPromise_resolve = undefined;
+        writer._readyPromise_reject = undefined;
+        writer._readyPromiseState = 'rejected';
+    }
+    function defaultWriterReadyPromiseReset(writer) {
+        defaultWriterReadyPromiseInitialize(writer);
+    }
+    function defaultWriterReadyPromiseResetToRejected(writer, reason) {
+        defaultWriterReadyPromiseInitializeAsRejected(writer, reason);
+    }
+    function defaultWriterReadyPromiseResolve(writer) {
+        if (writer._readyPromise_resolve === undefined) {
+            return;
+        }
+        writer._readyPromise_resolve(undefined);
+        writer._readyPromise_resolve = undefined;
+        writer._readyPromise_reject = undefined;
+        writer._readyPromiseState = 'fulfilled';
+    }
+
+    /// <reference lib="dom" />
+    var NativeDOMException = typeof DOMException !== 'undefined' ? DOMException : undefined;
+
+    /// <reference types="node" />
+    function isDOMExceptionConstructor(ctor) {
+        if (!(typeof ctor === 'function' || typeof ctor === 'object')) {
+            return false;
+        }
+        try {
+            new ctor();
+            return true;
+        }
+        catch (_a) {
+            return false;
+        }
+    }
+    function createDOMExceptionPolyfill() {
+        // eslint-disable-next-line no-shadow
+        var ctor = function DOMException(message, name) {
+            this.message = message || '';
+            this.name = name || 'Error';
+            if (Error.captureStackTrace) {
+                Error.captureStackTrace(this, this.constructor);
+            }
+        };
+        ctor.prototype = Object.create(Error.prototype);
+        Object.defineProperty(ctor.prototype, 'constructor', { value: ctor, writable: true, configurable: true });
+        return ctor;
+    }
+    // eslint-disable-next-line no-redeclare
+    var DOMException$1 = isDOMExceptionConstructor(NativeDOMException) ? NativeDOMException : createDOMExceptionPolyfill();
+
+    function ReadableStreamPipeTo(source, dest, preventClose, preventAbort, preventCancel, signal) {
+        var reader = AcquireReadableStreamDefaultReader(source);
+        var writer = AcquireWritableStreamDefaultWriter(dest);
+        source._disturbed = true;
+        var shuttingDown = false;
+        // This is used to keep track of the spec's requirement that we wait for ongoing writes during shutdown.
+        var currentWrite = promiseResolvedWith(undefined);
+        return newPromise(function (resolve, reject) {
+            var abortAlgorithm;
+            if (signal !== undefined) {
+                abortAlgorithm = function () {
+                    var error = new DOMException$1('Aborted', 'AbortError');
+                    var actions = [];
+                    if (!preventAbort) {
+                        actions.push(function () {
+                            if (dest._state === 'writable') {
+                                return WritableStreamAbort(dest, error);
+                            }
+                            return promiseResolvedWith(undefined);
+                        });
+                    }
+                    if (!preventCancel) {
+                        actions.push(function () {
+                            if (source._state === 'readable') {
+                                return ReadableStreamCancel(source, error);
+                            }
+                            return promiseResolvedWith(undefined);
+                        });
+                    }
+                    shutdownWithAction(function () { return Promise.all(actions.map(function (action) { return action(); })); }, true, error);
+                };
+                if (signal.aborted) {
+                    abortAlgorithm();
+                    return;
+                }
+                signal.addEventListener('abort', abortAlgorithm);
+            }
+            // Using reader and writer, read all chunks from this and write them to dest
+            // - Backpressure must be enforced
+            // - Shutdown must stop all activity
+            function pipeLoop() {
+                return newPromise(function (resolveLoop, rejectLoop) {
+                    function next(done) {
+                        if (done) {
+                            resolveLoop();
+                        }
+                        else {
+                            // Use `PerformPromiseThen` instead of `uponPromise` to avoid
+                            // adding unnecessary `.catch(rethrowAssertionErrorRejection)` handlers
+                            PerformPromiseThen(pipeStep(), next, rejectLoop);
+                        }
+                    }
+                    next(false);
+                });
+            }
+            function pipeStep() {
+                if (shuttingDown) {
+                    return promiseResolvedWith(true);
+                }
+                return PerformPromiseThen(writer._readyPromise, function () {
+                    return newPromise(function (resolveRead, rejectRead) {
+                        ReadableStreamDefaultReaderRead(reader, {
+                            _chunkSteps: function (chunk) {
+                                currentWrite = PerformPromiseThen(WritableStreamDefaultWriterWrite(writer, chunk), undefined, noop);
+                                resolveRead(false);
+                            },
+                            _closeSteps: function () { return resolveRead(true); },
+                            _errorSteps: rejectRead
+                        });
+                    });
+                });
+            }
+            // Errors must be propagated forward
+            isOrBecomesErrored(source, reader._closedPromise, function (storedError) {
+                if (!preventAbort) {
+                    shutdownWithAction(function () { return WritableStreamAbort(dest, storedError); }, true, storedError);
+                }
+                else {
+                    shutdown(true, storedError);
+                }
+            });
+            // Errors must be propagated backward
+            isOrBecomesErrored(dest, writer._closedPromise, function (storedError) {
+                if (!preventCancel) {
+                    shutdownWithAction(function () { return ReadableStreamCancel(source, storedError); }, true, storedError);
+                }
+                else {
+                    shutdown(true, storedError);
+                }
+            });
+            // Closing must be propagated forward
+            isOrBecomesClosed(source, reader._closedPromise, function () {
+                if (!preventClose) {
+                    shutdownWithAction(function () { return WritableStreamDefaultWriterCloseWithErrorPropagation(writer); });
+                }
+                else {
+                    shutdown();
+                }
+            });
+            // Closing must be propagated backward
+            if (WritableStreamCloseQueuedOrInFlight(dest) || dest._state === 'closed') {
+                var destClosed_1 = new TypeError('the destination writable stream closed before all data could be piped to it');
+                if (!preventCancel) {
+                    shutdownWithAction(function () { return ReadableStreamCancel(source, destClosed_1); }, true, destClosed_1);
+                }
+                else {
+                    shutdown(true, destClosed_1);
+                }
+            }
+            setPromiseIsHandledToTrue(pipeLoop());
+            function waitForWritesToFinish() {
+                // Another write may have started while we were waiting on this currentWrite, so we have to be sure to wait
+                // for that too.
+                var oldCurrentWrite = currentWrite;
+                return PerformPromiseThen(currentWrite, function () { return oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined; });
+            }
+            function isOrBecomesErrored(stream, promise, action) {
+                if (stream._state === 'errored') {
+                    action(stream._storedError);
+                }
+                else {
+                    uponRejection(promise, action);
+                }
+            }
+            function isOrBecomesClosed(stream, promise, action) {
+                if (stream._state === 'closed') {
+                    action();
+                }
+                else {
+                    uponFulfillment(promise, action);
+                }
+            }
+            function shutdownWithAction(action, originalIsError, originalError) {
+                if (shuttingDown) {
+                    return;
+                }
+                shuttingDown = true;
+                if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {
+                    uponFulfillment(waitForWritesToFinish(), doTheRest);
+                }
+                else {
+                    doTheRest();
+                }
+                function doTheRest() {
+                    uponPromise(action(), function () { return finalize(originalIsError, originalError); }, function (newError) { return finalize(true, newError); });
+                }
+            }
+            function shutdown(isError, error) {
+                if (shuttingDown) {
+                    return;
+                }
+                shuttingDown = true;
+                if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {
+                    uponFulfillment(waitForWritesToFinish(), function () { return finalize(isError, error); });
+                }
+                else {
+                    finalize(isError, error);
+                }
+            }
+            function finalize(isError, error) {
+                WritableStreamDefaultWriterRelease(writer);
+                ReadableStreamReaderGenericRelease(reader);
+                if (signal !== undefined) {
+                    signal.removeEventListener('abort', abortAlgorithm);
+                }
+                if (isError) {
+                    reject(error);
+                }
+                else {
+                    resolve(undefined);
+                }
+            }
+        });
+    }
+
+    /**
+     * Allows control of a {@link ReadableStream | readable stream}'s state and internal queue.
+     *
+     * @public
+     */
+    var ReadableStreamDefaultController = /** @class */ (function () {
+        function ReadableStreamDefaultController() {
+            throw new TypeError('Illegal constructor');
+        }
+        Object.defineProperty(ReadableStreamDefaultController.prototype, "desiredSize", {
+            /**
+             * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is
+             * over-full. An underlying source ought to use this information to determine when and how to apply backpressure.
+             */
+            get: function () {
+                if (!IsReadableStreamDefaultController(this)) {
+                    throw defaultControllerBrandCheckException$1('desiredSize');
+                }
+                return ReadableStreamDefaultControllerGetDesiredSize(this);
+            },
+            enumerable: false,
+            configurable: true
+        });
+        /**
+         * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from
+         * the stream, but once those are read, the stream will become closed.
+         */
+        ReadableStreamDefaultController.prototype.close = function () {
+            if (!IsReadableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$1('close');
+            }
+            if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {
+                throw new TypeError('The stream is not in a state that permits close');
+            }
+            ReadableStreamDefaultControllerClose(this);
+        };
+        ReadableStreamDefaultController.prototype.enqueue = function (chunk) {
+            if (chunk === void 0) { chunk = undefined; }
+            if (!IsReadableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$1('enqueue');
+            }
+            if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {
+                throw new TypeError('The stream is not in a state that permits enqueue');
+            }
+            return ReadableStreamDefaultControllerEnqueue(this, chunk);
+        };
+        /**
+         * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.
+         */
+        ReadableStreamDefaultController.prototype.error = function (e) {
+            if (e === void 0) { e = undefined; }
+            if (!IsReadableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$1('error');
+            }
+            ReadableStreamDefaultControllerError(this, e);
+        };
+        /** @internal */
+        ReadableStreamDefaultController.prototype[CancelSteps] = function (reason) {
+            ResetQueue(this);
+            var result = this._cancelAlgorithm(reason);
+            ReadableStreamDefaultControllerClearAlgorithms(this);
+            return result;
+        };
+        /** @internal */
+        ReadableStreamDefaultController.prototype[PullSteps] = function (readRequest) {
+            var stream = this._controlledReadableStream;
+            if (this._queue.length > 0) {
+                var chunk = DequeueValue(this);
+                if (this._closeRequested && this._queue.length === 0) {
+                    ReadableStreamDefaultControllerClearAlgorithms(this);
+                    ReadableStreamClose(stream);
+                }
+                else {
+                    ReadableStreamDefaultControllerCallPullIfNeeded(this);
+                }
+                readRequest._chunkSteps(chunk);
+            }
+            else {
+                ReadableStreamAddReadRequest(stream, readRequest);
+                ReadableStreamDefaultControllerCallPullIfNeeded(this);
+            }
+        };
+        return ReadableStreamDefaultController;
+    }());
+    Object.defineProperties(ReadableStreamDefaultController.prototype, {
+        close: { enumerable: true },
+        enqueue: { enumerable: true },
+        error: { enumerable: true },
+        desiredSize: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableStreamDefaultController',
+            configurable: true
+        });
+    }
+    // Abstract operations for the ReadableStreamDefaultController.
+    function IsReadableStreamDefaultController(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableStream')) {
+            return false;
+        }
+        return x instanceof ReadableStreamDefaultController;
+    }
+    function ReadableStreamDefaultControllerCallPullIfNeeded(controller) {
+        var shouldPull = ReadableStreamDefaultControllerShouldCallPull(controller);
+        if (!shouldPull) {
+            return;
+        }
+        if (controller._pulling) {
+            controller._pullAgain = true;
+            return;
+        }
+        controller._pulling = true;
+        var pullPromise = controller._pullAlgorithm();
+        uponPromise(pullPromise, function () {
+            controller._pulling = false;
+            if (controller._pullAgain) {
+                controller._pullAgain = false;
+                ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+            }
+        }, function (e) {
+            ReadableStreamDefaultControllerError(controller, e);
+        });
+    }
+    function ReadableStreamDefaultControllerShouldCallPull(controller) {
+        var stream = controller._controlledReadableStream;
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+            return false;
+        }
+        if (!controller._started) {
+            return false;
+        }
+        if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+            return true;
+        }
+        var desiredSize = ReadableStreamDefaultControllerGetDesiredSize(controller);
+        if (desiredSize > 0) {
+            return true;
+        }
+        return false;
+    }
+    function ReadableStreamDefaultControllerClearAlgorithms(controller) {
+        controller._pullAlgorithm = undefined;
+        controller._cancelAlgorithm = undefined;
+        controller._strategySizeAlgorithm = undefined;
+    }
+    // A client of ReadableStreamDefaultController may use these functions directly to bypass state check.
+    function ReadableStreamDefaultControllerClose(controller) {
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+            return;
+        }
+        var stream = controller._controlledReadableStream;
+        controller._closeRequested = true;
+        if (controller._queue.length === 0) {
+            ReadableStreamDefaultControllerClearAlgorithms(controller);
+            ReadableStreamClose(stream);
+        }
+    }
+    function ReadableStreamDefaultControllerEnqueue(controller, chunk) {
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+            return;
+        }
+        var stream = controller._controlledReadableStream;
+        if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+            ReadableStreamFulfillReadRequest(stream, chunk, false);
+        }
+        else {
+            var chunkSize = void 0;
+            try {
+                chunkSize = controller._strategySizeAlgorithm(chunk);
+            }
+            catch (chunkSizeE) {
+                ReadableStreamDefaultControllerError(controller, chunkSizeE);
+                throw chunkSizeE;
+            }
+            try {
+                EnqueueValueWithSize(controller, chunk, chunkSize);
+            }
+            catch (enqueueE) {
+                ReadableStreamDefaultControllerError(controller, enqueueE);
+                throw enqueueE;
+            }
+        }
+        ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+    }
+    function ReadableStreamDefaultControllerError(controller, e) {
+        var stream = controller._controlledReadableStream;
+        if (stream._state !== 'readable') {
+            return;
+        }
+        ResetQueue(controller);
+        ReadableStreamDefaultControllerClearAlgorithms(controller);
+        ReadableStreamError(stream, e);
+    }
+    function ReadableStreamDefaultControllerGetDesiredSize(controller) {
+        var state = controller._controlledReadableStream._state;
+        if (state === 'errored') {
+            return null;
+        }
+        if (state === 'closed') {
+            return 0;
+        }
+        return controller._strategyHWM - controller._queueTotalSize;
+    }
+    // This is used in the implementation of TransformStream.
+    function ReadableStreamDefaultControllerHasBackpressure(controller) {
+        if (ReadableStreamDefaultControllerShouldCallPull(controller)) {
+            return false;
+        }
+        return true;
+    }
+    function ReadableStreamDefaultControllerCanCloseOrEnqueue(controller) {
+        var state = controller._controlledReadableStream._state;
+        if (!controller._closeRequested && state === 'readable') {
+            return true;
+        }
+        return false;
+    }
+    function SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm) {
+        controller._controlledReadableStream = stream;
+        controller._queue = undefined;
+        controller._queueTotalSize = undefined;
+        ResetQueue(controller);
+        controller._started = false;
+        controller._closeRequested = false;
+        controller._pullAgain = false;
+        controller._pulling = false;
+        controller._strategySizeAlgorithm = sizeAlgorithm;
+        controller._strategyHWM = highWaterMark;
+        controller._pullAlgorithm = pullAlgorithm;
+        controller._cancelAlgorithm = cancelAlgorithm;
+        stream._readableStreamController = controller;
+        var startResult = startAlgorithm();
+        uponPromise(promiseResolvedWith(startResult), function () {
+            controller._started = true;
+            ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+        }, function (r) {
+            ReadableStreamDefaultControllerError(controller, r);
+        });
+    }
+    function SetUpReadableStreamDefaultControllerFromUnderlyingSource(stream, underlyingSource, highWaterMark, sizeAlgorithm) {
+        var controller = Object.create(ReadableStreamDefaultController.prototype);
+        var startAlgorithm = function () { return undefined; };
+        var pullAlgorithm = function () { return promiseResolvedWith(undefined); };
+        var cancelAlgorithm = function () { return promiseResolvedWith(undefined); };
+        if (underlyingSource.start !== undefined) {
+            startAlgorithm = function () { return underlyingSource.start(controller); };
+        }
+        if (underlyingSource.pull !== undefined) {
+            pullAlgorithm = function () { return underlyingSource.pull(controller); };
+        }
+        if (underlyingSource.cancel !== undefined) {
+            cancelAlgorithm = function (reason) { return underlyingSource.cancel(reason); };
+        }
+        SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm);
+    }
+    // Helper functions for the ReadableStreamDefaultController.
+    function defaultControllerBrandCheckException$1(name) {
+        return new TypeError("ReadableStreamDefaultController.prototype." + name + " can only be used on a ReadableStreamDefaultController");
+    }
+
+    function ReadableStreamTee(stream, cloneForBranch2) {
+        if (IsReadableByteStreamController(stream._readableStreamController)) {
+            return ReadableByteStreamTee(stream);
+        }
+        return ReadableStreamDefaultTee(stream);
+    }
+    function ReadableStreamDefaultTee(stream, cloneForBranch2) {
+        var reader = AcquireReadableStreamDefaultReader(stream);
+        var reading = false;
+        var readAgain = false;
+        var canceled1 = false;
+        var canceled2 = false;
+        var reason1;
+        var reason2;
+        var branch1;
+        var branch2;
+        var resolveCancelPromise;
+        var cancelPromise = newPromise(function (resolve) {
+            resolveCancelPromise = resolve;
+        });
+        function pullAlgorithm() {
+            if (reading) {
+                readAgain = true;
+                return promiseResolvedWith(undefined);
+            }
+            reading = true;
+            var readRequest = {
+                _chunkSteps: function (chunk) {
+                    // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                    // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                    // successful synchronously-available reads get ahead of asynchronously-available errors.
+                    queueMicrotask(function () {
+                        readAgain = false;
+                        var chunk1 = chunk;
+                        var chunk2 = chunk;
+                        // There is no way to access the cloning code right now in the reference implementation.
+                        // If we add one then we'll need an implementation for serializable objects.
+                        // if (!canceled2 && cloneForBranch2) {
+                        //   chunk2 = StructuredDeserialize(StructuredSerialize(chunk2));
+                        // }
+                        if (!canceled1) {
+                            ReadableStreamDefaultControllerEnqueue(branch1._readableStreamController, chunk1);
+                        }
+                        if (!canceled2) {
+                            ReadableStreamDefaultControllerEnqueue(branch2._readableStreamController, chunk2);
+                        }
+                        reading = false;
+                        if (readAgain) {
+                            pullAlgorithm();
+                        }
+                    });
+                },
+                _closeSteps: function () {
+                    reading = false;
+                    if (!canceled1) {
+                        ReadableStreamDefaultControllerClose(branch1._readableStreamController);
+                    }
+                    if (!canceled2) {
+                        ReadableStreamDefaultControllerClose(branch2._readableStreamController);
+                    }
+                    if (!canceled1 || !canceled2) {
+                        resolveCancelPromise(undefined);
+                    }
+                },
+                _errorSteps: function () {
+                    reading = false;
+                }
+            };
+            ReadableStreamDefaultReaderRead(reader, readRequest);
+            return promiseResolvedWith(undefined);
+        }
+        function cancel1Algorithm(reason) {
+            canceled1 = true;
+            reason1 = reason;
+            if (canceled2) {
+                var compositeReason = CreateArrayFromList([reason1, reason2]);
+                var cancelResult = ReadableStreamCancel(stream, compositeReason);
+                resolveCancelPromise(cancelResult);
+            }
+            return cancelPromise;
+        }
+        function cancel2Algorithm(reason) {
+            canceled2 = true;
+            reason2 = reason;
+            if (canceled1) {
+                var compositeReason = CreateArrayFromList([reason1, reason2]);
+                var cancelResult = ReadableStreamCancel(stream, compositeReason);
+                resolveCancelPromise(cancelResult);
+            }
+            return cancelPromise;
+        }
+        function startAlgorithm() {
+            // do nothing
+        }
+        branch1 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel1Algorithm);
+        branch2 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel2Algorithm);
+        uponRejection(reader._closedPromise, function (r) {
+            ReadableStreamDefaultControllerError(branch1._readableStreamController, r);
+            ReadableStreamDefaultControllerError(branch2._readableStreamController, r);
+            if (!canceled1 || !canceled2) {
+                resolveCancelPromise(undefined);
+            }
+        });
+        return [branch1, branch2];
+    }
+    function ReadableByteStreamTee(stream) {
+        var reader = AcquireReadableStreamDefaultReader(stream);
+        var reading = false;
+        var readAgainForBranch1 = false;
+        var readAgainForBranch2 = false;
+        var canceled1 = false;
+        var canceled2 = false;
+        var reason1;
+        var reason2;
+        var branch1;
+        var branch2;
+        var resolveCancelPromise;
+        var cancelPromise = newPromise(function (resolve) {
+            resolveCancelPromise = resolve;
+        });
+        function forwardReaderError(thisReader) {
+            uponRejection(thisReader._closedPromise, function (r) {
+                if (thisReader !== reader) {
+                    return;
+                }
+                ReadableByteStreamControllerError(branch1._readableStreamController, r);
+                ReadableByteStreamControllerError(branch2._readableStreamController, r);
+                if (!canceled1 || !canceled2) {
+                    resolveCancelPromise(undefined);
+                }
+            });
+        }
+        function pullWithDefaultReader() {
+            if (IsReadableStreamBYOBReader(reader)) {
+                ReadableStreamReaderGenericRelease(reader);
+                reader = AcquireReadableStreamDefaultReader(stream);
+                forwardReaderError(reader);
+            }
+            var readRequest = {
+                _chunkSteps: function (chunk) {
+                    // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                    // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                    // successful synchronously-available reads get ahead of asynchronously-available errors.
+                    queueMicrotask(function () {
+                        readAgainForBranch1 = false;
+                        readAgainForBranch2 = false;
+                        var chunk1 = chunk;
+                        var chunk2 = chunk;
+                        if (!canceled1 && !canceled2) {
+                            try {
+                                chunk2 = CloneAsUint8Array(chunk);
+                            }
+                            catch (cloneE) {
+                                ReadableByteStreamControllerError(branch1._readableStreamController, cloneE);
+                                ReadableByteStreamControllerError(branch2._readableStreamController, cloneE);
+                                resolveCancelPromise(ReadableStreamCancel(stream, cloneE));
+                                return;
+                            }
+                        }
+                        if (!canceled1) {
+                            ReadableByteStreamControllerEnqueue(branch1._readableStreamController, chunk1);
+                        }
+                        if (!canceled2) {
+                            ReadableByteStreamControllerEnqueue(branch2._readableStreamController, chunk2);
+                        }
+                        reading = false;
+                        if (readAgainForBranch1) {
+                            pull1Algorithm();
+                        }
+                        else if (readAgainForBranch2) {
+                            pull2Algorithm();
+                        }
+                    });
+                },
+                _closeSteps: function () {
+                    reading = false;
+                    if (!canceled1) {
+                        ReadableByteStreamControllerClose(branch1._readableStreamController);
+                    }
+                    if (!canceled2) {
+                        ReadableByteStreamControllerClose(branch2._readableStreamController);
+                    }
+                    if (branch1._readableStreamController._pendingPullIntos.length > 0) {
+                        ReadableByteStreamControllerRespond(branch1._readableStreamController, 0);
+                    }
+                    if (branch2._readableStreamController._pendingPullIntos.length > 0) {
+                        ReadableByteStreamControllerRespond(branch2._readableStreamController, 0);
+                    }
+                    if (!canceled1 || !canceled2) {
+                        resolveCancelPromise(undefined);
+                    }
+                },
+                _errorSteps: function () {
+                    reading = false;
+                }
+            };
+            ReadableStreamDefaultReaderRead(reader, readRequest);
+        }
+        function pullWithBYOBReader(view, forBranch2) {
+            if (IsReadableStreamDefaultReader(reader)) {
+                ReadableStreamReaderGenericRelease(reader);
+                reader = AcquireReadableStreamBYOBReader(stream);
+                forwardReaderError(reader);
+            }
+            var byobBranch = forBranch2 ? branch2 : branch1;
+            var otherBranch = forBranch2 ? branch1 : branch2;
+            var readIntoRequest = {
+                _chunkSteps: function (chunk) {
+                    // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                    // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                    // successful synchronously-available reads get ahead of asynchronously-available errors.
+                    queueMicrotask(function () {
+                        readAgainForBranch1 = false;
+                        readAgainForBranch2 = false;
+                        var byobCanceled = forBranch2 ? canceled2 : canceled1;
+                        var otherCanceled = forBranch2 ? canceled1 : canceled2;
+                        if (!otherCanceled) {
+                            var clonedChunk = void 0;
+                            try {
+                                clonedChunk = CloneAsUint8Array(chunk);
+                            }
+                            catch (cloneE) {
+                                ReadableByteStreamControllerError(byobBranch._readableStreamController, cloneE);
+                                ReadableByteStreamControllerError(otherBranch._readableStreamController, cloneE);
+                                resolveCancelPromise(ReadableStreamCancel(stream, cloneE));
+                                return;
+                            }
+                            if (!byobCanceled) {
+                                ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                            }
+                            ReadableByteStreamControllerEnqueue(otherBranch._readableStreamController, clonedChunk);
+                        }
+                        else if (!byobCanceled) {
+                            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                        }
+                        reading = false;
+                        if (readAgainForBranch1) {
+                            pull1Algorithm();
+                        }
+                        else if (readAgainForBranch2) {
+                            pull2Algorithm();
+                        }
+                    });
+                },
+                _closeSteps: function (chunk) {
+                    reading = false;
+                    var byobCanceled = forBranch2 ? canceled2 : canceled1;
+                    var otherCanceled = forBranch2 ? canceled1 : canceled2;
+                    if (!byobCanceled) {
+                        ReadableByteStreamControllerClose(byobBranch._readableStreamController);
+                    }
+                    if (!otherCanceled) {
+                        ReadableByteStreamControllerClose(otherBranch._readableStreamController);
+                    }
+                    if (chunk !== undefined) {
+                        if (!byobCanceled) {
+                            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                        }
+                        if (!otherCanceled && otherBranch._readableStreamController._pendingPullIntos.length > 0) {
+                            ReadableByteStreamControllerRespond(otherBranch._readableStreamController, 0);
+                        }
+                    }
+                    if (!byobCanceled || !otherCanceled) {
+                        resolveCancelPromise(undefined);
+                    }
+                },
+                _errorSteps: function () {
+                    reading = false;
+                }
+            };
+            ReadableStreamBYOBReaderRead(reader, view, readIntoRequest);
+        }
+        function pull1Algorithm() {
+            if (reading) {
+                readAgainForBranch1 = true;
+                return promiseResolvedWith(undefined);
+            }
+            reading = true;
+            var byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch1._readableStreamController);
+            if (byobRequest === null) {
+                pullWithDefaultReader();
+            }
+            else {
+                pullWithBYOBReader(byobRequest._view, false);
+            }
+            return promiseResolvedWith(undefined);
+        }
+        function pull2Algorithm() {
+            if (reading) {
+                readAgainForBranch2 = true;
+                return promiseResolvedWith(undefined);
+            }
+            reading = true;
+            var byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch2._readableStreamController);
+            if (byobRequest === null) {
+                pullWithDefaultReader();
+            }
+            else {
+                pullWithBYOBReader(byobRequest._view, true);
+            }
+            return promiseResolvedWith(undefined);
+        }
+        function cancel1Algorithm(reason) {
+            canceled1 = true;
+            reason1 = reason;
+            if (canceled2) {
+                var compositeReason = CreateArrayFromList([reason1, reason2]);
+                var cancelResult = ReadableStreamCancel(stream, compositeReason);
+                resolveCancelPromise(cancelResult);
+            }
+            return cancelPromise;
+        }
+        function cancel2Algorithm(reason) {
+            canceled2 = true;
+            reason2 = reason;
+            if (canceled1) {
+                var compositeReason = CreateArrayFromList([reason1, reason2]);
+                var cancelResult = ReadableStreamCancel(stream, compositeReason);
+                resolveCancelPromise(cancelResult);
+            }
+            return cancelPromise;
+        }
+        function startAlgorithm() {
+            return;
+        }
+        branch1 = CreateReadableByteStream(startAlgorithm, pull1Algorithm, cancel1Algorithm);
+        branch2 = CreateReadableByteStream(startAlgorithm, pull2Algorithm, cancel2Algorithm);
+        forwardReaderError(reader);
+        return [branch1, branch2];
+    }
+
+    function convertUnderlyingDefaultOrByteSource(source, context) {
+        assertDictionary(source, context);
+        var original = source;
+        var autoAllocateChunkSize = original === null || original === void 0 ? void 0 : original.autoAllocateChunkSize;
+        var cancel = original === null || original === void 0 ? void 0 : original.cancel;
+        var pull = original === null || original === void 0 ? void 0 : original.pull;
+        var start = original === null || original === void 0 ? void 0 : original.start;
+        var type = original === null || original === void 0 ? void 0 : original.type;
+        return {
+            autoAllocateChunkSize: autoAllocateChunkSize === undefined ?
+                undefined :
+                convertUnsignedLongLongWithEnforceRange(autoAllocateChunkSize, context + " has member 'autoAllocateChunkSize' that"),
+            cancel: cancel === undefined ?
+                undefined :
+                convertUnderlyingSourceCancelCallback(cancel, original, context + " has member 'cancel' that"),
+            pull: pull === undefined ?
+                undefined :
+                convertUnderlyingSourcePullCallback(pull, original, context + " has member 'pull' that"),
+            start: start === undefined ?
+                undefined :
+                convertUnderlyingSourceStartCallback(start, original, context + " has member 'start' that"),
+            type: type === undefined ? undefined : convertReadableStreamType(type, context + " has member 'type' that")
+        };
+    }
+    function convertUnderlyingSourceCancelCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return function (reason) { return promiseCall(fn, original, [reason]); };
+    }
+    function convertUnderlyingSourcePullCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return function (controller) { return promiseCall(fn, original, [controller]); };
+    }
+    function convertUnderlyingSourceStartCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return function (controller) { return reflectCall(fn, original, [controller]); };
+    }
+    function convertReadableStreamType(type, context) {
+        type = "" + type;
+        if (type !== 'bytes') {
+            throw new TypeError(context + " '" + type + "' is not a valid enumeration value for ReadableStreamType");
+        }
+        return type;
+    }
+
+    function convertReaderOptions(options, context) {
+        assertDictionary(options, context);
+        var mode = options === null || options === void 0 ? void 0 : options.mode;
+        return {
+            mode: mode === undefined ? undefined : convertReadableStreamReaderMode(mode, context + " has member 'mode' that")
+        };
+    }
+    function convertReadableStreamReaderMode(mode, context) {
+        mode = "" + mode;
+        if (mode !== 'byob') {
+            throw new TypeError(context + " '" + mode + "' is not a valid enumeration value for ReadableStreamReaderMode");
+        }
+        return mode;
+    }
+
+    function convertIteratorOptions(options, context) {
+        assertDictionary(options, context);
+        var preventCancel = options === null || options === void 0 ? void 0 : options.preventCancel;
+        return { preventCancel: Boolean(preventCancel) };
+    }
+
+    function convertPipeOptions(options, context) {
+        assertDictionary(options, context);
+        var preventAbort = options === null || options === void 0 ? void 0 : options.preventAbort;
+        var preventCancel = options === null || options === void 0 ? void 0 : options.preventCancel;
+        var preventClose = options === null || options === void 0 ? void 0 : options.preventClose;
+        var signal = options === null || options === void 0 ? void 0 : options.signal;
+        if (signal !== undefined) {
+            assertAbortSignal(signal, context + " has member 'signal' that");
+        }
+        return {
+            preventAbort: Boolean(preventAbort),
+            preventCancel: Boolean(preventCancel),
+            preventClose: Boolean(preventClose),
+            signal: signal
+        };
+    }
+    function assertAbortSignal(signal, context) {
+        if (!isAbortSignal(signal)) {
+            throw new TypeError(context + " is not an AbortSignal.");
+        }
+    }
+
+    function convertReadableWritablePair(pair, context) {
+        assertDictionary(pair, context);
+        var readable = pair === null || pair === void 0 ? void 0 : pair.readable;
+        assertRequiredField(readable, 'readable', 'ReadableWritablePair');
+        assertReadableStream(readable, context + " has member 'readable' that");
+        var writable = pair === null || pair === void 0 ? void 0 : pair.writable;
+        assertRequiredField(writable, 'writable', 'ReadableWritablePair');
+        assertWritableStream(writable, context + " has member 'writable' that");
+        return { readable: readable, writable: writable };
+    }
+
+    /**
+     * A readable stream represents a source of data, from which you can read.
+     *
+     * @public
+     */
+    var ReadableStream = /** @class */ (function () {
+        function ReadableStream(rawUnderlyingSource, rawStrategy) {
+            if (rawUnderlyingSource === void 0) { rawUnderlyingSource = {}; }
+            if (rawStrategy === void 0) { rawStrategy = {}; }
+            if (rawUnderlyingSource === undefined) {
+                rawUnderlyingSource = null;
+            }
+            else {
+                assertObject(rawUnderlyingSource, 'First parameter');
+            }
+            var strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');
+            var underlyingSource = convertUnderlyingDefaultOrByteSource(rawUnderlyingSource, 'First parameter');
+            InitializeReadableStream(this);
+            if (underlyingSource.type === 'bytes') {
+                if (strategy.size !== undefined) {
+                    throw new RangeError('The strategy for a byte stream cannot have a size function');
+                }
+                var highWaterMark = ExtractHighWaterMark(strategy, 0);
+                SetUpReadableByteStreamControllerFromUnderlyingSource(this, underlyingSource, highWaterMark);
+            }
+            else {
+                var sizeAlgorithm = ExtractSizeAlgorithm(strategy);
+                var highWaterMark = ExtractHighWaterMark(strategy, 1);
+                SetUpReadableStreamDefaultControllerFromUnderlyingSource(this, underlyingSource, highWaterMark, sizeAlgorithm);
+            }
+        }
+        Object.defineProperty(ReadableStream.prototype, "locked", {
+            /**
+             * Whether or not the readable stream is locked to a {@link ReadableStreamDefaultReader | reader}.
+             */
+            get: function () {
+                if (!IsReadableStream(this)) {
+                    throw streamBrandCheckException$1('locked');
+                }
+                return IsReadableStreamLocked(this);
+            },
+            enumerable: false,
+            configurable: true
+        });
+        /**
+         * Cancels the stream, signaling a loss of interest in the stream by a consumer.
+         *
+         * The supplied `reason` argument will be given to the underlying source's {@link UnderlyingSource.cancel | cancel()}
+         * method, which might or might not use it.
+         */
+        ReadableStream.prototype.cancel = function (reason) {
+            if (reason === void 0) { reason = undefined; }
+            if (!IsReadableStream(this)) {
+                return promiseRejectedWith(streamBrandCheckException$1('cancel'));
+            }
+            if (IsReadableStreamLocked(this)) {
+                return promiseRejectedWith(new TypeError('Cannot cancel a stream that already has a reader'));
+            }
+            return ReadableStreamCancel(this, reason);
+        };
+        ReadableStream.prototype.getReader = function (rawOptions) {
+            if (rawOptions === void 0) { rawOptions = undefined; }
+            if (!IsReadableStream(this)) {
+                throw streamBrandCheckException$1('getReader');
+            }
+            var options = convertReaderOptions(rawOptions, 'First parameter');
+            if (options.mode === undefined) {
+                return AcquireReadableStreamDefaultReader(this);
+            }
+            return AcquireReadableStreamBYOBReader(this);
+        };
+        ReadableStream.prototype.pipeThrough = function (rawTransform, rawOptions) {
+            if (rawOptions === void 0) { rawOptions = {}; }
+            if (!IsReadableStream(this)) {
+                throw streamBrandCheckException$1('pipeThrough');
+            }
+            assertRequiredArgument(rawTransform, 1, 'pipeThrough');
+            var transform = convertReadableWritablePair(rawTransform, 'First parameter');
+            var options = convertPipeOptions(rawOptions, 'Second parameter');
+            if (IsReadableStreamLocked(this)) {
+                throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked ReadableStream');
+            }
+            if (IsWritableStreamLocked(transform.writable)) {
+                throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked WritableStream');
+            }
+            var promise = ReadableStreamPipeTo(this, transform.writable, options.preventClose, options.preventAbort, options.preventCancel, options.signal);
+            setPromiseIsHandledToTrue(promise);
+            return transform.readable;
+        };
+        ReadableStream.prototype.pipeTo = function (destination, rawOptions) {
+            if (rawOptions === void 0) { rawOptions = {}; }
+            if (!IsReadableStream(this)) {
+                return promiseRejectedWith(streamBrandCheckException$1('pipeTo'));
+            }
+            if (destination === undefined) {
+                return promiseRejectedWith("Parameter 1 is required in 'pipeTo'.");
+            }
+            if (!IsWritableStream(destination)) {
+                return promiseRejectedWith(new TypeError("ReadableStream.prototype.pipeTo's first argument must be a WritableStream"));
+            }
+            var options;
+            try {
+                options = convertPipeOptions(rawOptions, 'Second parameter');
+            }
+            catch (e) {
+                return promiseRejectedWith(e);
+            }
+            if (IsReadableStreamLocked(this)) {
+                return promiseRejectedWith(new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream'));
+            }
+            if (IsWritableStreamLocked(destination)) {
+                return promiseRejectedWith(new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream'));
+            }
+            return ReadableStreamPipeTo(this, destination, options.preventClose, options.preventAbort, options.preventCancel, options.signal);
+        };
+        /**
+         * Tees this readable stream, returning a two-element array containing the two resulting branches as
+         * new {@link ReadableStream} instances.
+         *
+         * Teeing a stream will lock it, preventing any other consumer from acquiring a reader.
+         * To cancel the stream, cancel both of the resulting branches; a composite cancellation reason will then be
+         * propagated to the stream's underlying source.
+         *
+         * Note that the chunks seen in each branch will be the same object. If the chunks are not immutable,
+         * this could allow interference between the two branches.
+         */
+        ReadableStream.prototype.tee = function () {
+            if (!IsReadableStream(this)) {
+                throw streamBrandCheckException$1('tee');
+            }
+            var branches = ReadableStreamTee(this);
+            return CreateArrayFromList(branches);
+        };
+        ReadableStream.prototype.values = function (rawOptions) {
+            if (rawOptions === void 0) { rawOptions = undefined; }
+            if (!IsReadableStream(this)) {
+                throw streamBrandCheckException$1('values');
+            }
+            var options = convertIteratorOptions(rawOptions, 'First parameter');
+            return AcquireReadableStreamAsyncIterator(this, options.preventCancel);
+        };
+        return ReadableStream;
+    }());
+    Object.defineProperties(ReadableStream.prototype, {
+        cancel: { enumerable: true },
+        getReader: { enumerable: true },
+        pipeThrough: { enumerable: true },
+        pipeTo: { enumerable: true },
+        tee: { enumerable: true },
+        values: { enumerable: true },
+        locked: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableStream.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableStream',
+            configurable: true
+        });
+    }
+    if (typeof SymbolPolyfill.asyncIterator === 'symbol') {
+        Object.defineProperty(ReadableStream.prototype, SymbolPolyfill.asyncIterator, {
+            value: ReadableStream.prototype.values,
+            writable: true,
+            configurable: true
+        });
+    }
+    // Abstract operations for the ReadableStream.
+    // Throws if and only if startAlgorithm throws.
+    function CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm) {
+        if (highWaterMark === void 0) { highWaterMark = 1; }
+        if (sizeAlgorithm === void 0) { sizeAlgorithm = function () { return 1; }; }
+        var stream = Object.create(ReadableStream.prototype);
+        InitializeReadableStream(stream);
+        var controller = Object.create(ReadableStreamDefaultController.prototype);
+        SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm);
+        return stream;
+    }
+    // Throws if and only if startAlgorithm throws.
+    function CreateReadableByteStream(startAlgorithm, pullAlgorithm, cancelAlgorithm) {
+        var stream = Object.create(ReadableStream.prototype);
+        InitializeReadableStream(stream);
+        var controller = Object.create(ReadableByteStreamController.prototype);
+        SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, 0, undefined);
+        return stream;
+    }
+    function InitializeReadableStream(stream) {
+        stream._state = 'readable';
+        stream._reader = undefined;
+        stream._storedError = undefined;
+        stream._disturbed = false;
+    }
+    function IsReadableStream(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_readableStreamController')) {
+            return false;
+        }
+        return x instanceof ReadableStream;
+    }
+    function IsReadableStreamLocked(stream) {
+        if (stream._reader === undefined) {
+            return false;
+        }
+        return true;
+    }
+    // ReadableStream API exposed for controllers.
+    function ReadableStreamCancel(stream, reason) {
+        stream._disturbed = true;
+        if (stream._state === 'closed') {
+            return promiseResolvedWith(undefined);
+        }
+        if (stream._state === 'errored') {
+            return promiseRejectedWith(stream._storedError);
+        }
+        ReadableStreamClose(stream);
+        var reader = stream._reader;
+        if (reader !== undefined && IsReadableStreamBYOBReader(reader)) {
+            reader._readIntoRequests.forEach(function (readIntoRequest) {
+                readIntoRequest._closeSteps(undefined);
+            });
+            reader._readIntoRequests = new SimpleQueue();
+        }
+        var sourceCancelPromise = stream._readableStreamController[CancelSteps](reason);
+        return transformPromiseWith(sourceCancelPromise, noop);
+    }
+    function ReadableStreamClose(stream) {
+        stream._state = 'closed';
+        var reader = stream._reader;
+        if (reader === undefined) {
+            return;
+        }
+        defaultReaderClosedPromiseResolve(reader);
+        if (IsReadableStreamDefaultReader(reader)) {
+            reader._readRequests.forEach(function (readRequest) {
+                readRequest._closeSteps();
+            });
+            reader._readRequests = new SimpleQueue();
+        }
+    }
+    function ReadableStreamError(stream, e) {
+        stream._state = 'errored';
+        stream._storedError = e;
+        var reader = stream._reader;
+        if (reader === undefined) {
+            return;
+        }
+        defaultReaderClosedPromiseReject(reader, e);
+        if (IsReadableStreamDefaultReader(reader)) {
+            reader._readRequests.forEach(function (readRequest) {
+                readRequest._errorSteps(e);
+            });
+            reader._readRequests = new SimpleQueue();
+        }
+        else {
+            reader._readIntoRequests.forEach(function (readIntoRequest) {
+                readIntoRequest._errorSteps(e);
+            });
+            reader._readIntoRequests = new SimpleQueue();
+        }
+    }
+    // Helper functions for the ReadableStream.
+    function streamBrandCheckException$1(name) {
+        return new TypeError("ReadableStream.prototype." + name + " can only be used on a ReadableStream");
+    }
+
+    function convertQueuingStrategyInit(init, context) {
+        assertDictionary(init, context);
+        var highWaterMark = init === null || init === void 0 ? void 0 : init.highWaterMark;
+        assertRequiredField(highWaterMark, 'highWaterMark', 'QueuingStrategyInit');
+        return {
+            highWaterMark: convertUnrestrictedDouble(highWaterMark)
+        };
+    }
+
+    // The size function must not have a prototype property nor be a constructor
+    var byteLengthSizeFunction = function (chunk) {
+        return chunk.byteLength;
+    };
+    try {
+        Object.defineProperty(byteLengthSizeFunction, 'name', {
+            value: 'size',
+            configurable: true
+        });
+    }
+    catch (_a) {
+        // This property is non-configurable in older browsers, so ignore if this throws.
+        // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility
+    }
+    /**
+     * A queuing strategy that counts the number of bytes in each chunk.
+     *
+     * @public
+     */
+    var ByteLengthQueuingStrategy = /** @class */ (function () {
+        function ByteLengthQueuingStrategy(options) {
+            assertRequiredArgument(options, 1, 'ByteLengthQueuingStrategy');
+            options = convertQueuingStrategyInit(options, 'First parameter');
+            this._byteLengthQueuingStrategyHighWaterMark = options.highWaterMark;
+        }
+        Object.defineProperty(ByteLengthQueuingStrategy.prototype, "highWaterMark", {
+            /**
+             * Returns the high water mark provided to the constructor.
+             */
+            get: function () {
+                if (!IsByteLengthQueuingStrategy(this)) {
+                    throw byteLengthBrandCheckException('highWaterMark');
+                }
+                return this._byteLengthQueuingStrategyHighWaterMark;
+            },
+            enumerable: false,
+            configurable: true
+        });
+        Object.defineProperty(ByteLengthQueuingStrategy.prototype, "size", {
+            /**
+             * Measures the size of `chunk` by returning the value of its `byteLength` property.
+             */
+            get: function () {
+                if (!IsByteLengthQueuingStrategy(this)) {
+                    throw byteLengthBrandCheckException('size');
+                }
+                return byteLengthSizeFunction;
+            },
+            enumerable: false,
+            configurable: true
+        });
+        return ByteLengthQueuingStrategy;
+    }());
+    Object.defineProperties(ByteLengthQueuingStrategy.prototype, {
+        highWaterMark: { enumerable: true },
+        size: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ByteLengthQueuingStrategy.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ByteLengthQueuingStrategy',
+            configurable: true
+        });
+    }
+    // Helper functions for the ByteLengthQueuingStrategy.
+    function byteLengthBrandCheckException(name) {
+        return new TypeError("ByteLengthQueuingStrategy.prototype." + name + " can only be used on a ByteLengthQueuingStrategy");
+    }
+    function IsByteLengthQueuingStrategy(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_byteLengthQueuingStrategyHighWaterMark')) {
+            return false;
+        }
+        return x instanceof ByteLengthQueuingStrategy;
+    }
+
+    // The size function must not have a prototype property nor be a constructor
+    var countSizeFunction = function () {
+        return 1;
+    };
+    try {
+        Object.defineProperty(countSizeFunction, 'name', {
+            value: 'size',
+            configurable: true
+        });
+    }
+    catch (_a) {
+        // This property is non-configurable in older browsers, so ignore if this throws.
+        // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility
+    }
+    /**
+     * A queuing strategy that counts the number of chunks.
+     *
+     * @public
+     */
+    var CountQueuingStrategy = /** @class */ (function () {
+        function CountQueuingStrategy(options) {
+            assertRequiredArgument(options, 1, 'CountQueuingStrategy');
+            options = convertQueuingStrategyInit(options, 'First parameter');
+            this._countQueuingStrategyHighWaterMark = options.highWaterMark;
+        }
+        Object.defineProperty(CountQueuingStrategy.prototype, "highWaterMark", {
+            /**
+             * Returns the high water mark provided to the constructor.
+             */
+            get: function () {
+                if (!IsCountQueuingStrategy(this)) {
+                    throw countBrandCheckException('highWaterMark');
+                }
+                return this._countQueuingStrategyHighWaterMark;
+            },
+            enumerable: false,
+            configurable: true
+        });
+        Object.defineProperty(CountQueuingStrategy.prototype, "size", {
+            /**
+             * Measures the size of `chunk` by always returning 1.
+             * This ensures that the total queue size is a count of the number of chunks in the queue.
+             */
+            get: function () {
+                if (!IsCountQueuingStrategy(this)) {
+                    throw countBrandCheckException('size');
+                }
+                return countSizeFunction;
+            },
+            enumerable: false,
+            configurable: true
+        });
+        return CountQueuingStrategy;
+    }());
+    Object.defineProperties(CountQueuingStrategy.prototype, {
+        highWaterMark: { enumerable: true },
+        size: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(CountQueuingStrategy.prototype, SymbolPolyfill.toStringTag, {
+            value: 'CountQueuingStrategy',
+            configurable: true
+        });
+    }
+    // Helper functions for the CountQueuingStrategy.
+    function countBrandCheckException(name) {
+        return new TypeError("CountQueuingStrategy.prototype." + name + " can only be used on a CountQueuingStrategy");
+    }
+    function IsCountQueuingStrategy(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_countQueuingStrategyHighWaterMark')) {
+            return false;
+        }
+        return x instanceof CountQueuingStrategy;
+    }
+
+    function convertTransformer(original, context) {
+        assertDictionary(original, context);
+        var flush = original === null || original === void 0 ? void 0 : original.flush;
+        var readableType = original === null || original === void 0 ? void 0 : original.readableType;
+        var start = original === null || original === void 0 ? void 0 : original.start;
+        var transform = original === null || original === void 0 ? void 0 : original.transform;
+        var writableType = original === null || original === void 0 ? void 0 : original.writableType;
+        return {
+            flush: flush === undefined ?
+                undefined :
+                convertTransformerFlushCallback(flush, original, context + " has member 'flush' that"),
+            readableType: readableType,
+            start: start === undefined ?
+                undefined :
+                convertTransformerStartCallback(start, original, context + " has member 'start' that"),
+            transform: transform === undefined ?
+                undefined :
+                convertTransformerTransformCallback(transform, original, context + " has member 'transform' that"),
+            writableType: writableType
+        };
+    }
+    function convertTransformerFlushCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return function (controller) { return promiseCall(fn, original, [controller]); };
+    }
+    function convertTransformerStartCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return function (controller) { return reflectCall(fn, original, [controller]); };
+    }
+    function convertTransformerTransformCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return function (chunk, controller) { return promiseCall(fn, original, [chunk, controller]); };
+    }
+
+    // Class TransformStream
+    /**
+     * A transform stream consists of a pair of streams: a {@link WritableStream | writable stream},
+     * known as its writable side, and a {@link ReadableStream | readable stream}, known as its readable side.
+     * In a manner specific to the transform stream in question, writes to the writable side result in new data being
+     * made available for reading from the readable side.
+     *
+     * @public
+     */
+    var TransformStream = /** @class */ (function () {
+        function TransformStream(rawTransformer, rawWritableStrategy, rawReadableStrategy) {
+            if (rawTransformer === void 0) { rawTransformer = {}; }
+            if (rawWritableStrategy === void 0) { rawWritableStrategy = {}; }
+            if (rawReadableStrategy === void 0) { rawReadableStrategy = {}; }
+            if (rawTransformer === undefined) {
+                rawTransformer = null;
+            }
+            var writableStrategy = convertQueuingStrategy(rawWritableStrategy, 'Second parameter');
+            var readableStrategy = convertQueuingStrategy(rawReadableStrategy, 'Third parameter');
+            var transformer = convertTransformer(rawTransformer, 'First parameter');
+            if (transformer.readableType !== undefined) {
+                throw new RangeError('Invalid readableType specified');
+            }
+            if (transformer.writableType !== undefined) {
+                throw new RangeError('Invalid writableType specified');
+            }
+            var readableHighWaterMark = ExtractHighWaterMark(readableStrategy, 0);
+            var readableSizeAlgorithm = ExtractSizeAlgorithm(readableStrategy);
+            var writableHighWaterMark = ExtractHighWaterMark(writableStrategy, 1);
+            var writableSizeAlgorithm = ExtractSizeAlgorithm(writableStrategy);
+            var startPromise_resolve;
+            var startPromise = newPromise(function (resolve) {
+                startPromise_resolve = resolve;
+            });
+            InitializeTransformStream(this, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm);
+            SetUpTransformStreamDefaultControllerFromTransformer(this, transformer);
+            if (transformer.start !== undefined) {
+                startPromise_resolve(transformer.start(this._transformStreamController));
+            }
+            else {
+                startPromise_resolve(undefined);
+            }
+        }
+        Object.defineProperty(TransformStream.prototype, "readable", {
+            /**
+             * The readable side of the transform stream.
+             */
+            get: function () {
+                if (!IsTransformStream(this)) {
+                    throw streamBrandCheckException('readable');
+                }
+                return this._readable;
+            },
+            enumerable: false,
+            configurable: true
+        });
+        Object.defineProperty(TransformStream.prototype, "writable", {
+            /**
+             * The writable side of the transform stream.
+             */
+            get: function () {
+                if (!IsTransformStream(this)) {
+                    throw streamBrandCheckException('writable');
+                }
+                return this._writable;
+            },
+            enumerable: false,
+            configurable: true
+        });
+        return TransformStream;
+    }());
+    Object.defineProperties(TransformStream.prototype, {
+        readable: { enumerable: true },
+        writable: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(TransformStream.prototype, SymbolPolyfill.toStringTag, {
+            value: 'TransformStream',
+            configurable: true
+        });
+    }
+    function InitializeTransformStream(stream, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm) {
+        function startAlgorithm() {
+            return startPromise;
+        }
+        function writeAlgorithm(chunk) {
+            return TransformStreamDefaultSinkWriteAlgorithm(stream, chunk);
+        }
+        function abortAlgorithm(reason) {
+            return TransformStreamDefaultSinkAbortAlgorithm(stream, reason);
+        }
+        function closeAlgorithm() {
+            return TransformStreamDefaultSinkCloseAlgorithm(stream);
+        }
+        stream._writable = CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, writableHighWaterMark, writableSizeAlgorithm);
+        function pullAlgorithm() {
+            return TransformStreamDefaultSourcePullAlgorithm(stream);
+        }
+        function cancelAlgorithm(reason) {
+            TransformStreamErrorWritableAndUnblockWrite(stream, reason);
+            return promiseResolvedWith(undefined);
+        }
+        stream._readable = CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, readableHighWaterMark, readableSizeAlgorithm);
+        // The [[backpressure]] slot is set to undefined so that it can be initialised by TransformStreamSetBackpressure.
+        stream._backpressure = undefined;
+        stream._backpressureChangePromise = undefined;
+        stream._backpressureChangePromise_resolve = undefined;
+        TransformStreamSetBackpressure(stream, true);
+        stream._transformStreamController = undefined;
+    }
+    function IsTransformStream(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_transformStreamController')) {
+            return false;
+        }
+        return x instanceof TransformStream;
+    }
+    // This is a no-op if both sides are already errored.
+    function TransformStreamError(stream, e) {
+        ReadableStreamDefaultControllerError(stream._readable._readableStreamController, e);
+        TransformStreamErrorWritableAndUnblockWrite(stream, e);
+    }
+    function TransformStreamErrorWritableAndUnblockWrite(stream, e) {
+        TransformStreamDefaultControllerClearAlgorithms(stream._transformStreamController);
+        WritableStreamDefaultControllerErrorIfNeeded(stream._writable._writableStreamController, e);
+        if (stream._backpressure) {
+            // Pretend that pull() was called to permit any pending write() calls to complete. TransformStreamSetBackpressure()
+            // cannot be called from enqueue() or pull() once the ReadableStream is errored, so this will will be the final time
+            // _backpressure is set.
+            TransformStreamSetBackpressure(stream, false);
+        }
+    }
+    function TransformStreamSetBackpressure(stream, backpressure) {
+        // Passes also when called during construction.
+        if (stream._backpressureChangePromise !== undefined) {
+            stream._backpressureChangePromise_resolve();
+        }
+        stream._backpressureChangePromise = newPromise(function (resolve) {
+            stream._backpressureChangePromise_resolve = resolve;
+        });
+        stream._backpressure = backpressure;
+    }
+    // Class TransformStreamDefaultController
+    /**
+     * Allows control of the {@link ReadableStream} and {@link WritableStream} of the associated {@link TransformStream}.
+     *
+     * @public
+     */
+    var TransformStreamDefaultController = /** @class */ (function () {
+        function TransformStreamDefaultController() {
+            throw new TypeError('Illegal constructor');
+        }
+        Object.defineProperty(TransformStreamDefaultController.prototype, "desiredSize", {
+            /**
+             * Returns the desired size to fill the readable side’s internal queue. It can be negative, if the queue is over-full.
+             */
+            get: function () {
+                if (!IsTransformStreamDefaultController(this)) {
+                    throw defaultControllerBrandCheckException('desiredSize');
+                }
+                var readableController = this._controlledTransformStream._readable._readableStreamController;
+                return ReadableStreamDefaultControllerGetDesiredSize(readableController);
+            },
+            enumerable: false,
+            configurable: true
+        });
+        TransformStreamDefaultController.prototype.enqueue = function (chunk) {
+            if (chunk === void 0) { chunk = undefined; }
+            if (!IsTransformStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException('enqueue');
+            }
+            TransformStreamDefaultControllerEnqueue(this, chunk);
+        };
+        /**
+         * Errors both the readable side and the writable side of the controlled transform stream, making all future
+         * interactions with it fail with the given error `e`. Any chunks queued for transformation will be discarded.
+         */
+        TransformStreamDefaultController.prototype.error = function (reason) {
+            if (reason === void 0) { reason = undefined; }
+            if (!IsTransformStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException('error');
+            }
+            TransformStreamDefaultControllerError(this, reason);
+        };
+        /**
+         * Closes the readable side and errors the writable side of the controlled transform stream. This is useful when the
+         * transformer only needs to consume a portion of the chunks written to the writable side.
+         */
+        TransformStreamDefaultController.prototype.terminate = function () {
+            if (!IsTransformStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException('terminate');
+            }
+            TransformStreamDefaultControllerTerminate(this);
+        };
+        return TransformStreamDefaultController;
+    }());
+    Object.defineProperties(TransformStreamDefaultController.prototype, {
+        enqueue: { enumerable: true },
+        error: { enumerable: true },
+        terminate: { enumerable: true },
+        desiredSize: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(TransformStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+            value: 'TransformStreamDefaultController',
+            configurable: true
+        });
+    }
+    // Transform Stream Default Controller Abstract Operations
+    function IsTransformStreamDefaultController(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_controlledTransformStream')) {
+            return false;
+        }
+        return x instanceof TransformStreamDefaultController;
+    }
+    function SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm) {
+        controller._controlledTransformStream = stream;
+        stream._transformStreamController = controller;
+        controller._transformAlgorithm = transformAlgorithm;
+        controller._flushAlgorithm = flushAlgorithm;
+    }
+    function SetUpTransformStreamDefaultControllerFromTransformer(stream, transformer) {
+        var controller = Object.create(TransformStreamDefaultController.prototype);
+        var transformAlgorithm = function (chunk) {
+            try {
+                TransformStreamDefaultControllerEnqueue(controller, chunk);
+                return promiseResolvedWith(undefined);
+            }
+            catch (transformResultE) {
+                return promiseRejectedWith(transformResultE);
+            }
+        };
+        var flushAlgorithm = function () { return promiseResolvedWith(undefined); };
+        if (transformer.transform !== undefined) {
+            transformAlgorithm = function (chunk) { return transformer.transform(chunk, controller); };
+        }
+        if (transformer.flush !== undefined) {
+            flushAlgorithm = function () { return transformer.flush(controller); };
+        }
+        SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);
+    }
+    function TransformStreamDefaultControllerClearAlgorithms(controller) {
+        controller._transformAlgorithm = undefined;
+        controller._flushAlgorithm = undefined;
+    }
+    function TransformStreamDefaultControllerEnqueue(controller, chunk) {
+        var stream = controller._controlledTransformStream;
+        var readableController = stream._readable._readableStreamController;
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(readableController)) {
+            throw new TypeError('Readable side is not in a state that permits enqueue');
+        }
+        // We throttle transform invocations based on the backpressure of the ReadableStream, but we still
+        // accept TransformStreamDefaultControllerEnqueue() calls.
+        try {
+            ReadableStreamDefaultControllerEnqueue(readableController, chunk);
+        }
+        catch (e) {
+            // This happens when readableStrategy.size() throws.
+            TransformStreamErrorWritableAndUnblockWrite(stream, e);
+            throw stream._readable._storedError;
+        }
+        var backpressure = ReadableStreamDefaultControllerHasBackpressure(readableController);
+        if (backpressure !== stream._backpressure) {
+            TransformStreamSetBackpressure(stream, true);
+        }
+    }
+    function TransformStreamDefaultControllerError(controller, e) {
+        TransformStreamError(controller._controlledTransformStream, e);
+    }
+    function TransformStreamDefaultControllerPerformTransform(controller, chunk) {
+        var transformPromise = controller._transformAlgorithm(chunk);
+        return transformPromiseWith(transformPromise, undefined, function (r) {
+            TransformStreamError(controller._controlledTransformStream, r);
+            throw r;
+        });
+    }
+    function TransformStreamDefaultControllerTerminate(controller) {
+        var stream = controller._controlledTransformStream;
+        var readableController = stream._readable._readableStreamController;
+        ReadableStreamDefaultControllerClose(readableController);
+        var error = new TypeError('TransformStream terminated');
+        TransformStreamErrorWritableAndUnblockWrite(stream, error);
+    }
+    // TransformStreamDefaultSink Algorithms
+    function TransformStreamDefaultSinkWriteAlgorithm(stream, chunk) {
+        var controller = stream._transformStreamController;
+        if (stream._backpressure) {
+            var backpressureChangePromise = stream._backpressureChangePromise;
+            return transformPromiseWith(backpressureChangePromise, function () {
+                var writable = stream._writable;
+                var state = writable._state;
+                if (state === 'erroring') {
+                    throw writable._storedError;
+                }
+                return TransformStreamDefaultControllerPerformTransform(controller, chunk);
+            });
+        }
+        return TransformStreamDefaultControllerPerformTransform(controller, chunk);
+    }
+    function TransformStreamDefaultSinkAbortAlgorithm(stream, reason) {
+        // abort() is not called synchronously, so it is possible for abort() to be called when the stream is already
+        // errored.
+        TransformStreamError(stream, reason);
+        return promiseResolvedWith(undefined);
+    }
+    function TransformStreamDefaultSinkCloseAlgorithm(stream) {
+        // stream._readable cannot change after construction, so caching it across a call to user code is safe.
+        var readable = stream._readable;
+        var controller = stream._transformStreamController;
+        var flushPromise = controller._flushAlgorithm();
+        TransformStreamDefaultControllerClearAlgorithms(controller);
+        // Return a promise that is fulfilled with undefined on success.
+        return transformPromiseWith(flushPromise, function () {
+            if (readable._state === 'errored') {
+                throw readable._storedError;
+            }
+            ReadableStreamDefaultControllerClose(readable._readableStreamController);
+        }, function (r) {
+            TransformStreamError(stream, r);
+            throw readable._storedError;
+        });
+    }
+    // TransformStreamDefaultSource Algorithms
+    function TransformStreamDefaultSourcePullAlgorithm(stream) {
+        // Invariant. Enforced by the promises returned by start() and pull().
+        TransformStreamSetBackpressure(stream, false);
+        // Prevent the next pull() call until there is backpressure.
+        return stream._backpressureChangePromise;
+    }
+    // Helper functions for the TransformStreamDefaultController.
+    function defaultControllerBrandCheckException(name) {
+        return new TypeError("TransformStreamDefaultController.prototype." + name + " can only be used on a TransformStreamDefaultController");
+    }
+    // Helper functions for the TransformStream.
+    function streamBrandCheckException(name) {
+        return new TypeError("TransformStream.prototype." + name + " can only be used on a TransformStream");
+    }
+
+    var exports$1 = {
+        ReadableStream: ReadableStream,
+        ReadableStreamDefaultController: ReadableStreamDefaultController,
+        ReadableByteStreamController: ReadableByteStreamController,
+        ReadableStreamBYOBRequest: ReadableStreamBYOBRequest,
+        ReadableStreamDefaultReader: ReadableStreamDefaultReader,
+        ReadableStreamBYOBReader: ReadableStreamBYOBReader,
+        WritableStream: WritableStream,
+        WritableStreamDefaultController: WritableStreamDefaultController,
+        WritableStreamDefaultWriter: WritableStreamDefaultWriter,
+        ByteLengthQueuingStrategy: ByteLengthQueuingStrategy,
+        CountQueuingStrategy: CountQueuingStrategy,
+        TransformStream: TransformStream,
+        TransformStreamDefaultController: TransformStreamDefaultController
+    };
+    // Add classes to global scope
+    if (typeof globals !== 'undefined') {
+        for (var prop in exports$1) {
+            if (Object.prototype.hasOwnProperty.call(exports$1, prop)) {
+                Object.defineProperty(globals, prop, {
+                    value: exports$1[prop],
+                    writable: true,
+                    configurable: true
+                });
+            }
+        }
+    }
+
+    exports.ByteLengthQueuingStrategy = ByteLengthQueuingStrategy;
+    exports.CountQueuingStrategy = CountQueuingStrategy;
+    exports.ReadableByteStreamController = ReadableByteStreamController;
+    exports.ReadableStream = ReadableStream;
+    exports.ReadableStreamBYOBReader = ReadableStreamBYOBReader;
+    exports.ReadableStreamBYOBRequest = ReadableStreamBYOBRequest;
+    exports.ReadableStreamDefaultController = ReadableStreamDefaultController;
+    exports.ReadableStreamDefaultReader = ReadableStreamDefaultReader;
+    exports.TransformStream = TransformStream;
+    exports.TransformStreamDefaultController = TransformStreamDefaultController;
+    exports.WritableStream = WritableStream;
+    exports.WritableStreamDefaultController = WritableStreamDefaultController;
+    exports.WritableStreamDefaultWriter = WritableStreamDefaultWriter;
+
+    Object.defineProperty(exports, '__esModule', { value: true });
+
+})));
+//# sourceMappingURL=polyfill.js.map
diff --git a/node_modules/web-streams-polyfill/dist/polyfill.js.map b/node_modules/web-streams-polyfill/dist/polyfill.js.map
new file mode 100644
index 0000000..dfbc396
--- /dev/null
+++ b/node_modules/web-streams-polyfill/dist/polyfill.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"polyfill.js","sources":["../src/stub/symbol.ts","../src/utils.ts","../src/lib/helpers/miscellaneous.ts","../src/lib/helpers/webidl.ts","../src/lib/simple-queue.ts","../src/lib/readable-stream/generic-reader.ts","../src/lib/abstract-ops/internal-methods.ts","../src/stub/number-isfinite.ts","../src/stub/math-trunc.ts","../src/lib/validators/basic.ts","../src/lib/validators/readable-stream.ts","../src/lib/readable-stream/default-reader.ts","../src/target/es5/stub/async-iterator-prototype.ts","../src/lib/readable-stream/async-iterator.ts","../src/stub/number-isnan.ts","../src/lib/abstract-ops/ecmascript.ts","../src/lib/abstract-ops/miscellaneous.ts","../src/lib/abstract-ops/queue-with-sizes.ts","../src/lib/readable-stream/byte-stream-controller.ts","../src/lib/readable-stream/byob-reader.ts","../src/lib/abstract-ops/queuing-strategy.ts","../src/lib/validators/queuing-strategy.ts","../src/lib/validators/underlying-sink.ts","../src/lib/validators/writable-stream.ts","../src/lib/abort-signal.ts","../src/lib/writable-stream.ts","../src/stub/native.ts","../src/stub/dom-exception.ts","../src/lib/readable-stream/pipe.ts","../src/lib/readable-stream/default-controller.ts","../src/lib/readable-stream/tee.ts","../src/lib/validators/underlying-source.ts","../src/lib/validators/reader-options.ts","../src/lib/validators/iterator-options.ts","../src/lib/validators/pipe-options.ts","../src/lib/validators/readable-writable-pair.ts","../src/lib/readable-stream.ts","../src/lib/validators/queuing-strategy-init.ts","../src/lib/byte-length-queuing-strategy.ts","../src/lib/count-queuing-strategy.ts","../src/lib/validators/transformer.ts","../src/lib/transform-stream.ts","../src/polyfill.ts"],"sourcesContent":["/// <reference lib=\"es2015.symbol\" />\n\nconst SymbolPolyfill: (description?: string) => symbol =\n  typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol' ?\n    Symbol :\n    description => `Symbol(${description})` as any as symbol;\n\nexport default SymbolPolyfill;\n","/// <reference lib=\"dom\" />\n\nexport function noop(): undefined {\n  return undefined;\n}\n\nfunction getGlobals() {\n  if (typeof self !== 'undefined') {\n    return self;\n  } else if (typeof window !== 'undefined') {\n    return window;\n  } else if (typeof global !== 'undefined') {\n    return global;\n  }\n  return undefined;\n}\n\nexport const globals = getGlobals();\n","import { noop } from '../../utils';\nimport { AssertionError } from '../../stub/assert';\n\nexport function typeIsObject(x: any): x is object {\n  return (typeof x === 'object' && x !== null) || typeof x === 'function';\n}\n\nexport const rethrowAssertionErrorRejection: (e: any) => void =\n  DEBUG ? e => {\n    // Used throughout the reference implementation, as `.catch(rethrowAssertionErrorRejection)`, to ensure any errors\n    // get shown. There are places in the spec where we do promise transformations and purposefully ignore or don't\n    // expect any errors, but assertion errors are always problematic.\n    if (e && e instanceof AssertionError) {\n      setTimeout(() => {\n        throw e;\n      }, 0);\n    }\n  } : noop;\n","import { globals } from '../../utils';\nimport { rethrowAssertionErrorRejection } from './miscellaneous';\nimport assert from '../../stub/assert';\n\nconst originalPromise = Promise;\nconst originalPromiseThen = Promise.prototype.then;\nconst originalPromiseResolve = Promise.resolve.bind(originalPromise);\nconst originalPromiseReject = Promise.reject.bind(originalPromise);\n\nexport function newPromise<T>(executor: (\n  resolve: (value: T | PromiseLike<T>) => void,\n  reject: (reason?: any) => void\n) => void): Promise<T> {\n  return new originalPromise(executor);\n}\n\nexport function promiseResolvedWith<T>(value: T | PromiseLike<T>): Promise<T> {\n  return originalPromiseResolve(value);\n}\n\nexport function promiseRejectedWith<T = never>(reason: any): Promise<T> {\n  return originalPromiseReject(reason);\n}\n\nexport function PerformPromiseThen<T, TResult1 = T, TResult2 = never>(\n  promise: Promise<T>,\n  onFulfilled?: (value: T) => TResult1 | PromiseLike<TResult1>,\n  onRejected?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2> {\n  // There doesn't appear to be any way to correctly emulate the behaviour from JavaScript, so this is just an\n  // approximation.\n  return originalPromiseThen.call(promise, onFulfilled, onRejected) as Promise<TResult1 | TResult2>;\n}\n\nexport function uponPromise<T>(\n  promise: Promise<T>,\n  onFulfilled?: (value: T) => void | PromiseLike<void>,\n  onRejected?: (reason: any) => void | PromiseLike<void>): void {\n  PerformPromiseThen(\n    PerformPromiseThen(promise, onFulfilled, onRejected),\n    undefined,\n    rethrowAssertionErrorRejection\n  );\n}\n\nexport function uponFulfillment<T>(promise: Promise<T>, onFulfilled: (value: T) => void | PromiseLike<void>): void {\n  uponPromise(promise, onFulfilled);\n}\n\nexport function uponRejection(promise: Promise<unknown>, onRejected: (reason: any) => void | PromiseLike<void>): void {\n  uponPromise(promise, undefined, onRejected);\n}\n\nexport function transformPromiseWith<T, TResult1 = T, TResult2 = never>(\n  promise: Promise<T>,\n  fulfillmentHandler?: (value: T) => TResult1 | PromiseLike<TResult1>,\n  rejectionHandler?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2> {\n  return PerformPromiseThen(promise, fulfillmentHandler, rejectionHandler);\n}\n\nexport function setPromiseIsHandledToTrue(promise: Promise<unknown>): void {\n  PerformPromiseThen(promise, undefined, rethrowAssertionErrorRejection);\n}\n\nexport const queueMicrotask: (fn: () => void) => void = (() => {\n  const globalQueueMicrotask = globals && globals.queueMicrotask;\n  if (typeof globalQueueMicrotask === 'function') {\n    return globalQueueMicrotask;\n  }\n\n  const resolvedPromise = promiseResolvedWith(undefined);\n  return (fn: () => void) => PerformPromiseThen(resolvedPromise, fn);\n})();\n\nexport function reflectCall<T, A extends any[], R>(F: (this: T, ...fnArgs: A) => R, V: T, args: A): R {\n  if (typeof F !== 'function') {\n    throw new TypeError('Argument is not a function');\n  }\n  return Function.prototype.apply.call(F, V, args);\n}\n\nexport function promiseCall<T, A extends any[], R>(F: (this: T, ...fnArgs: A) => R | PromiseLike<R>,\n                                                   V: T,\n                                                   args: A): Promise<R> {\n  assert(typeof F === 'function');\n  assert(V !== undefined);\n  assert(Array.isArray(args));\n  try {\n    return promiseResolvedWith(reflectCall(F, V, args));\n  } catch (value) {\n    return promiseRejectedWith(value);\n  }\n}\n","import assert from '../stub/assert';\n\n// Original from Chromium\n// https://chromium.googlesource.com/chromium/src/+/0aee4434a4dba42a42abaea9bfbc0cd196a63bc1/third_party/blink/renderer/core/streams/SimpleQueue.js\n\nconst QUEUE_MAX_ARRAY_SIZE = 16384;\n\ninterface Node<T> {\n  _elements: T[];\n  _next: Node<T> | undefined;\n}\n\n/**\n * Simple queue structure.\n *\n * Avoids scalability issues with using a packed array directly by using\n * multiple arrays in a linked list and keeping the array size bounded.\n */\nexport class SimpleQueue<T> {\n  private _front: Node<T>;\n  private _back: Node<T>;\n  private _cursor = 0;\n  private _size = 0;\n\n  constructor() {\n    // _front and _back are always defined.\n    this._front = {\n      _elements: [],\n      _next: undefined\n    };\n    this._back = this._front;\n    // The cursor is used to avoid calling Array.shift().\n    // It contains the index of the front element of the array inside the\n    // front-most node. It is always in the range [0, QUEUE_MAX_ARRAY_SIZE).\n    this._cursor = 0;\n    // When there is only one node, size === elements.length - cursor.\n    this._size = 0;\n  }\n\n  get length(): number {\n    return this._size;\n  }\n\n  // For exception safety, this method is structured in order:\n  // 1. Read state\n  // 2. Calculate required state mutations\n  // 3. Perform state mutations\n  push(element: T): void {\n    const oldBack = this._back;\n    let newBack = oldBack;\n    assert(oldBack._next === undefined);\n    if (oldBack._elements.length === QUEUE_MAX_ARRAY_SIZE - 1) {\n      newBack = {\n        _elements: [],\n        _next: undefined\n      };\n    }\n\n    // push() is the mutation most likely to throw an exception, so it\n    // goes first.\n    oldBack._elements.push(element);\n    if (newBack !== oldBack) {\n      this._back = newBack;\n      oldBack._next = newBack;\n    }\n    ++this._size;\n  }\n\n  // Like push(), shift() follows the read -> calculate -> mutate pattern for\n  // exception safety.\n  shift(): T {\n    assert(this._size > 0); // must not be called on an empty queue\n\n    const oldFront = this._front;\n    let newFront = oldFront;\n    const oldCursor = this._cursor;\n    let newCursor = oldCursor + 1;\n\n    const elements = oldFront._elements;\n    const element = elements[oldCursor];\n\n    if (newCursor === QUEUE_MAX_ARRAY_SIZE) {\n      assert(elements.length === QUEUE_MAX_ARRAY_SIZE);\n      assert(oldFront._next !== undefined);\n      newFront = oldFront._next!;\n      newCursor = 0;\n    }\n\n    // No mutations before this point.\n    --this._size;\n    this._cursor = newCursor;\n    if (oldFront !== newFront) {\n      this._front = newFront;\n    }\n\n    // Permit shifted element to be garbage collected.\n    elements[oldCursor] = undefined!;\n\n    return element;\n  }\n\n  // The tricky thing about forEach() is that it can be called\n  // re-entrantly. The queue may be mutated inside the callback. It is easy to\n  // see that push() within the callback has no negative effects since the end\n  // of the queue is checked for on every iteration. If shift() is called\n  // repeatedly within the callback then the next iteration may return an\n  // element that has been removed. In this case the callback will be called\n  // with undefined values until we either \"catch up\" with elements that still\n  // exist or reach the back of the queue.\n  forEach(callback: (element: T) => void): void {\n    let i = this._cursor;\n    let node = this._front;\n    let elements = node._elements;\n    while (i !== elements.length || node._next !== undefined) {\n      if (i === elements.length) {\n        assert(node._next !== undefined);\n        assert(i === QUEUE_MAX_ARRAY_SIZE);\n        node = node._next!;\n        elements = node._elements;\n        i = 0;\n        if (elements.length === 0) {\n          break;\n        }\n      }\n      callback(elements[i]);\n      ++i;\n    }\n  }\n\n  // Return the element that would be returned if shift() was called now,\n  // without modifying the queue.\n  peek(): T {\n    assert(this._size > 0); // must not be called on an empty queue\n\n    const front = this._front;\n    const cursor = this._cursor;\n    return front._elements[cursor];\n  }\n}\n","import assert from '../../stub/assert';\nimport { ReadableStream, ReadableStreamCancel, ReadableStreamReader } from '../readable-stream';\nimport { newPromise, setPromiseIsHandledToTrue } from '../helpers/webidl';\n\nexport function ReadableStreamReaderGenericInitialize<R>(reader: ReadableStreamReader<R>, stream: ReadableStream<R>) {\n  reader._ownerReadableStream = stream;\n  stream._reader = reader;\n\n  if (stream._state === 'readable') {\n    defaultReaderClosedPromiseInitialize(reader);\n  } else if (stream._state === 'closed') {\n    defaultReaderClosedPromiseInitializeAsResolved(reader);\n  } else {\n    assert(stream._state === 'errored');\n\n    defaultReaderClosedPromiseInitializeAsRejected(reader, stream._storedError);\n  }\n}\n\n// A client of ReadableStreamDefaultReader and ReadableStreamBYOBReader may use these functions directly to bypass state\n// check.\n\nexport function ReadableStreamReaderGenericCancel(reader: ReadableStreamReader<any>, reason: any): Promise<undefined> {\n  const stream = reader._ownerReadableStream;\n  assert(stream !== undefined);\n  return ReadableStreamCancel(stream, reason);\n}\n\nexport function ReadableStreamReaderGenericRelease(reader: ReadableStreamReader<any>) {\n  assert(reader._ownerReadableStream !== undefined);\n  assert(reader._ownerReadableStream._reader === reader);\n\n  if (reader._ownerReadableStream._state === 'readable') {\n    defaultReaderClosedPromiseReject(\n      reader,\n      new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));\n  } else {\n    defaultReaderClosedPromiseResetToRejected(\n      reader,\n      new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));\n  }\n\n  reader._ownerReadableStream._reader = undefined;\n  reader._ownerReadableStream = undefined!;\n}\n\n// Helper functions for the readers.\n\nexport function readerLockException(name: string): TypeError {\n  return new TypeError('Cannot ' + name + ' a stream using a released reader');\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nexport function defaultReaderClosedPromiseInitialize(reader: ReadableStreamReader<any>) {\n  reader._closedPromise = newPromise((resolve, reject) => {\n    reader._closedPromise_resolve = resolve;\n    reader._closedPromise_reject = reject;\n  });\n}\n\nexport function defaultReaderClosedPromiseInitializeAsRejected(reader: ReadableStreamReader<any>, reason: any) {\n  defaultReaderClosedPromiseInitialize(reader);\n  defaultReaderClosedPromiseReject(reader, reason);\n}\n\nexport function defaultReaderClosedPromiseInitializeAsResolved(reader: ReadableStreamReader<any>) {\n  defaultReaderClosedPromiseInitialize(reader);\n  defaultReaderClosedPromiseResolve(reader);\n}\n\nexport function defaultReaderClosedPromiseReject(reader: ReadableStreamReader<any>, reason: any) {\n  if (reader._closedPromise_reject === undefined) {\n    return;\n  }\n\n  setPromiseIsHandledToTrue(reader._closedPromise);\n  reader._closedPromise_reject(reason);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n\nexport function defaultReaderClosedPromiseResetToRejected(reader: ReadableStreamReader<any>, reason: any) {\n  assert(reader._closedPromise_resolve === undefined);\n  assert(reader._closedPromise_reject === undefined);\n\n  defaultReaderClosedPromiseInitializeAsRejected(reader, reason);\n}\n\nexport function defaultReaderClosedPromiseResolve(reader: ReadableStreamReader<any>) {\n  if (reader._closedPromise_resolve === undefined) {\n    return;\n  }\n\n  reader._closedPromise_resolve(undefined);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n","export const AbortSteps = Symbol('[[AbortSteps]]');\nexport const ErrorSteps = Symbol('[[ErrorSteps]]');\nexport const CancelSteps = Symbol('[[CancelSteps]]');\nexport const PullSteps = Symbol('[[PullSteps]]');\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite#Polyfill\nconst NumberIsFinite: typeof Number.isFinite = Number.isFinite || function (x) {\n  return typeof x === 'number' && isFinite(x);\n};\n\nexport default NumberIsFinite;\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc#Polyfill\nconst MathTrunc: typeof Math.trunc = Math.trunc || function (v) {\n  return v < 0 ? Math.ceil(v) : Math.floor(v);\n};\n\nexport default MathTrunc;\n","import NumberIsFinite from '../../stub/number-isfinite';\nimport MathTrunc from '../../stub/math-trunc';\n\n// https://heycam.github.io/webidl/#idl-dictionaries\nexport function isDictionary(x: any): x is object | null {\n  return typeof x === 'object' || typeof x === 'function';\n}\n\nexport function assertDictionary(obj: unknown,\n                                 context: string): asserts obj is object | null | undefined {\n  if (obj !== undefined && !isDictionary(obj)) {\n    throw new TypeError(`${context} is not an object.`);\n  }\n}\n\nexport type AnyFunction = (...args: any[]) => any;\n\n// https://heycam.github.io/webidl/#idl-callback-functions\nexport function assertFunction(x: unknown, context: string): asserts x is AnyFunction {\n  if (typeof x !== 'function') {\n    throw new TypeError(`${context} is not a function.`);\n  }\n}\n\n// https://heycam.github.io/webidl/#idl-object\nexport function isObject(x: any): x is object {\n  return (typeof x === 'object' && x !== null) || typeof x === 'function';\n}\n\nexport function assertObject(x: unknown,\n                             context: string): asserts x is object {\n  if (!isObject(x)) {\n    throw new TypeError(`${context} is not an object.`);\n  }\n}\n\nexport function assertRequiredArgument<T extends any>(x: T | undefined,\n                                                      position: number,\n                                                      context: string): asserts x is T {\n  if (x === undefined) {\n    throw new TypeError(`Parameter ${position} is required in '${context}'.`);\n  }\n}\n\nexport function assertRequiredField<T extends any>(x: T | undefined,\n                                                   field: string,\n                                                   context: string): asserts x is T {\n  if (x === undefined) {\n    throw new TypeError(`${field} is required in '${context}'.`);\n  }\n}\n\n// https://heycam.github.io/webidl/#idl-unrestricted-double\nexport function convertUnrestrictedDouble(value: unknown): number {\n  return Number(value);\n}\n\nfunction censorNegativeZero(x: number): number {\n  return x === 0 ? 0 : x;\n}\n\nfunction integerPart(x: number): number {\n  return censorNegativeZero(MathTrunc(x));\n}\n\n// https://heycam.github.io/webidl/#idl-unsigned-long-long\nexport function convertUnsignedLongLongWithEnforceRange(value: unknown, context: string): number {\n  const lowerBound = 0;\n  const upperBound = Number.MAX_SAFE_INTEGER;\n\n  let x = Number(value);\n  x = censorNegativeZero(x);\n\n  if (!NumberIsFinite(x)) {\n    throw new TypeError(`${context} is not a finite number`);\n  }\n\n  x = integerPart(x);\n\n  if (x < lowerBound || x > upperBound) {\n    throw new TypeError(`${context} is outside the accepted range of ${lowerBound} to ${upperBound}, inclusive`);\n  }\n\n  if (!NumberIsFinite(x) || x === 0) {\n    return 0;\n  }\n\n  // TODO Use BigInt if supported?\n  // let xBigInt = BigInt(integerPart(x));\n  // xBigInt = BigInt.asUintN(64, xBigInt);\n  // return Number(xBigInt);\n\n  return x;\n}\n","import { IsReadableStream, ReadableStream } from '../readable-stream';\n\nexport function assertReadableStream(x: unknown, context: string): asserts x is ReadableStream {\n  if (!IsReadableStream(x)) {\n    throw new TypeError(`${context} is not a ReadableStream.`);\n  }\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericInitialize,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport { IsReadableStreamLocked, ReadableStream } from '../readable-stream';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { PullSteps } from '../abstract-ops/internal-methods';\nimport { newPromise, promiseRejectedWith } from '../helpers/webidl';\nimport { assertRequiredArgument } from '../validators/basic';\nimport { assertReadableStream } from '../validators/readable-stream';\n\n/**\n * A result returned by {@link ReadableStreamDefaultReader.read}.\n *\n * @public\n */\nexport type ReadableStreamDefaultReadResult<T> = {\n  done: false;\n  value: T;\n} | {\n  done: true;\n  value?: undefined;\n}\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamDefaultReader<R>(stream: ReadableStream): ReadableStreamDefaultReader<R> {\n  return new ReadableStreamDefaultReader(stream);\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamAddReadRequest<R>(stream: ReadableStream<R>,\n                                                readRequest: ReadRequest<R>): void {\n  assert(IsReadableStreamDefaultReader(stream._reader));\n  assert(stream._state === 'readable');\n\n  (stream._reader! as ReadableStreamDefaultReader<R>)._readRequests.push(readRequest);\n}\n\nexport function ReadableStreamFulfillReadRequest<R>(stream: ReadableStream<R>, chunk: R | undefined, done: boolean) {\n  const reader = stream._reader as ReadableStreamDefaultReader<R>;\n\n  assert(reader._readRequests.length > 0);\n\n  const readRequest = reader._readRequests.shift()!;\n  if (done) {\n    readRequest._closeSteps();\n  } else {\n    readRequest._chunkSteps(chunk!);\n  }\n}\n\nexport function ReadableStreamGetNumReadRequests<R>(stream: ReadableStream<R>): number {\n  return (stream._reader as ReadableStreamDefaultReader<R>)._readRequests.length;\n}\n\nexport function ReadableStreamHasDefaultReader(stream: ReadableStream): boolean {\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return false;\n  }\n\n  if (!IsReadableStreamDefaultReader(reader)) {\n    return false;\n  }\n\n  return true;\n}\n\n// Readers\n\nexport interface ReadRequest<R> {\n  _chunkSteps(chunk: R): void;\n\n  _closeSteps(): void;\n\n  _errorSteps(e: any): void;\n}\n\n/**\n * A default reader vended by a {@link ReadableStream}.\n *\n * @public\n */\nexport class ReadableStreamDefaultReader<R = any> {\n  /** @internal */\n  _ownerReadableStream!: ReadableStream<R>;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readRequests: SimpleQueue<ReadRequest<R>>;\n\n  constructor(stream: ReadableStream<R>) {\n    assertRequiredArgument(stream, 1, 'ReadableStreamDefaultReader');\n    assertReadableStream(stream, 'First parameter');\n\n    if (IsReadableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n    }\n\n    ReadableStreamReaderGenericInitialize(this, stream);\n\n    this._readRequests = new SimpleQueue();\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed,\n   * or rejected if the stream ever errors or the reader's lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('cancel'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('cancel'));\n    }\n\n    return ReadableStreamReaderGenericCancel(this, reason);\n  }\n\n  /**\n   * Returns a promise that allows access to the next chunk from the stream's internal queue, if available.\n   *\n   * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.\n   */\n  read(): Promise<ReadableStreamDefaultReadResult<R>> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('read'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('read from'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamDefaultReadResult<R>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamDefaultReadResult<R>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),\n      _closeSteps: () => resolvePromise({ value: undefined, done: true }),\n      _errorSteps: e => rejectPromise(e)\n    };\n    ReadableStreamDefaultReaderRead(this, readRequest);\n    return promise;\n  }\n\n  /**\n   * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.\n   * If the associated stream is errored when the lock is released, the reader will appear errored in the same way\n   * from now on; otherwise, the reader will appear closed.\n   *\n   * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by\n   * the reader's {@link ReadableStreamDefaultReader.read | read()} method has not yet been settled. Attempting to\n   * do so will throw a `TypeError` and leave the reader locked to the stream.\n   */\n  releaseLock(): void {\n    if (!IsReadableStreamDefaultReader(this)) {\n      throw defaultReaderBrandCheckException('releaseLock');\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return;\n    }\n\n    if (this._readRequests.length > 0) {\n      throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n    }\n\n    ReadableStreamReaderGenericRelease(this);\n  }\n}\n\nObject.defineProperties(ReadableStreamDefaultReader.prototype, {\n  cancel: { enumerable: true },\n  read: { enumerable: true },\n  releaseLock: { enumerable: true },\n  closed: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamDefaultReader.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamDefaultReader',\n    configurable: true\n  });\n}\n\n// Abstract operations for the readers.\n\nexport function IsReadableStreamDefaultReader<R = any>(x: any): x is ReadableStreamDefaultReader<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readRequests')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamDefaultReader;\n}\n\nexport function ReadableStreamDefaultReaderRead<R>(reader: ReadableStreamDefaultReader<R>,\n                                                   readRequest: ReadRequest<R>): void {\n  const stream = reader._ownerReadableStream;\n\n  assert(stream !== undefined);\n\n  stream._disturbed = true;\n\n  if (stream._state === 'closed') {\n    readRequest._closeSteps();\n  } else if (stream._state === 'errored') {\n    readRequest._errorSteps(stream._storedError);\n  } else {\n    assert(stream._state === 'readable');\n    stream._readableStreamController[PullSteps](readRequest as ReadRequest<any>);\n  }\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nfunction defaultReaderBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamDefaultReader.prototype.${name} can only be used on a ReadableStreamDefaultReader`);\n}\n","/// <reference lib=\"es2018.asynciterable\" />\n\nexport let AsyncIteratorPrototype: AsyncIterable<any> | undefined;\n\nif (typeof Symbol.asyncIterator === 'symbol') {\n  // We're running inside a ES2018+ environment, but we're compiling to an older syntax.\n  // We cannot access %AsyncIteratorPrototype% without non-ES2018 syntax, but we can re-create it.\n  AsyncIteratorPrototype = {\n    // 25.1.3.1 %AsyncIteratorPrototype% [ @@asyncIterator ] ( )\n    // https://tc39.github.io/ecma262/#sec-asynciteratorprototype-asynciterator\n    [Symbol.asyncIterator](this: AsyncIterator<any>) {\n      return this;\n    }\n  };\n  Object.defineProperty(AsyncIteratorPrototype, Symbol.asyncIterator, { enumerable: false });\n}\n","/// <reference lib=\"es2018.asynciterable\" />\n\nimport { ReadableStream } from '../readable-stream';\nimport {\n  AcquireReadableStreamDefaultReader,\n  ReadableStreamDefaultReader,\n  ReadableStreamDefaultReaderRead,\n  ReadableStreamDefaultReadResult,\n  ReadRequest\n} from './default-reader';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport assert from '../../stub/assert';\nimport { AsyncIteratorPrototype } from '@@target/stub/async-iterator-prototype';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport {\n  newPromise,\n  promiseRejectedWith,\n  promiseResolvedWith,\n  queueMicrotask,\n  transformPromiseWith\n} from '../helpers/webidl';\n\n/**\n * An async iterator returned by {@link ReadableStream.values}.\n *\n * @public\n */\nexport interface ReadableStreamAsyncIterator<R> extends AsyncIterator<R> {\n  next(): Promise<IteratorResult<R, undefined>>;\n\n  return(value?: any): Promise<IteratorResult<any>>;\n}\n\nexport class ReadableStreamAsyncIteratorImpl<R> {\n  private readonly _reader: ReadableStreamDefaultReader<R>;\n  private readonly _preventCancel: boolean;\n  private _ongoingPromise: Promise<ReadableStreamDefaultReadResult<R>> | undefined = undefined;\n  private _isFinished = false;\n\n  constructor(reader: ReadableStreamDefaultReader<R>, preventCancel: boolean) {\n    this._reader = reader;\n    this._preventCancel = preventCancel;\n  }\n\n  next(): Promise<ReadableStreamDefaultReadResult<R>> {\n    const nextSteps = () => this._nextSteps();\n    this._ongoingPromise = this._ongoingPromise ?\n      transformPromiseWith(this._ongoingPromise, nextSteps, nextSteps) :\n      nextSteps();\n    return this._ongoingPromise;\n  }\n\n  return(value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    const returnSteps = () => this._returnSteps(value);\n    return this._ongoingPromise ?\n      transformPromiseWith(this._ongoingPromise, returnSteps, returnSteps) :\n      returnSteps();\n  }\n\n  private _nextSteps(): Promise<ReadableStreamDefaultReadResult<R>> {\n    if (this._isFinished) {\n      return Promise.resolve({ value: undefined, done: true });\n    }\n\n    const reader = this._reader;\n    if (reader._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('iterate'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamDefaultReadResult<R>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamDefaultReadResult<R>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => {\n        this._ongoingPromise = undefined;\n        // This needs to be delayed by one microtask, otherwise we stop pulling too early which breaks a test.\n        // FIXME Is this a bug in the specification, or in the test?\n        queueMicrotask(() => resolvePromise({ value: chunk, done: false }));\n      },\n      _closeSteps: () => {\n        this._ongoingPromise = undefined;\n        this._isFinished = true;\n        ReadableStreamReaderGenericRelease(reader);\n        resolvePromise({ value: undefined, done: true });\n      },\n      _errorSteps: reason => {\n        this._ongoingPromise = undefined;\n        this._isFinished = true;\n        ReadableStreamReaderGenericRelease(reader);\n        rejectPromise(reason);\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n    return promise;\n  }\n\n  private _returnSteps(value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (this._isFinished) {\n      return Promise.resolve({ value, done: true });\n    }\n    this._isFinished = true;\n\n    const reader = this._reader;\n    if (reader._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('finish iterating'));\n    }\n\n    assert(reader._readRequests.length === 0);\n\n    if (!this._preventCancel) {\n      const result = ReadableStreamReaderGenericCancel(reader, value);\n      ReadableStreamReaderGenericRelease(reader);\n      return transformPromiseWith(result, () => ({ value, done: true }));\n    }\n\n    ReadableStreamReaderGenericRelease(reader);\n    return promiseResolvedWith({ value, done: true });\n  }\n}\n\ndeclare class ReadableStreamAsyncIteratorInstance<R> implements ReadableStreamAsyncIterator<R> {\n  /** @interal */\n  _asyncIteratorImpl: ReadableStreamAsyncIteratorImpl<R>;\n\n  next(): Promise<IteratorResult<R, undefined>>;\n\n  return(value?: any): Promise<IteratorResult<any>>;\n}\n\nconst ReadableStreamAsyncIteratorPrototype: ReadableStreamAsyncIteratorInstance<any> = {\n  next(this: ReadableStreamAsyncIteratorInstance<any>): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (!IsReadableStreamAsyncIterator(this)) {\n      return promiseRejectedWith(streamAsyncIteratorBrandCheckException('next'));\n    }\n    return this._asyncIteratorImpl.next();\n  },\n\n  return(this: ReadableStreamAsyncIteratorInstance<any>, value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (!IsReadableStreamAsyncIterator(this)) {\n      return promiseRejectedWith(streamAsyncIteratorBrandCheckException('return'));\n    }\n    return this._asyncIteratorImpl.return(value);\n  }\n} as any;\nif (AsyncIteratorPrototype !== undefined) {\n  Object.setPrototypeOf(ReadableStreamAsyncIteratorPrototype, AsyncIteratorPrototype);\n}\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamAsyncIterator<R>(stream: ReadableStream<R>,\n                                                      preventCancel: boolean): ReadableStreamAsyncIterator<R> {\n  const reader = AcquireReadableStreamDefaultReader<R>(stream);\n  const impl = new ReadableStreamAsyncIteratorImpl(reader, preventCancel);\n  const iterator: ReadableStreamAsyncIteratorInstance<R> = Object.create(ReadableStreamAsyncIteratorPrototype);\n  iterator._asyncIteratorImpl = impl;\n  return iterator;\n}\n\nfunction IsReadableStreamAsyncIterator<R = any>(x: any): x is ReadableStreamAsyncIterator<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_asyncIteratorImpl')) {\n    return false;\n  }\n\n  try {\n    // noinspection SuspiciousTypeOfGuard\n    return (x as ReadableStreamAsyncIteratorInstance<any>)._asyncIteratorImpl instanceof\n      ReadableStreamAsyncIteratorImpl;\n  } catch {\n    return false;\n  }\n}\n\n// Helper functions for the ReadableStream.\n\nfunction streamAsyncIteratorBrandCheckException(name: string): TypeError {\n  return new TypeError(`ReadableStreamAsyncIterator.${name} can only be used on a ReadableSteamAsyncIterator`);\n}\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Polyfill\nconst NumberIsNaN: typeof Number.isNaN = Number.isNaN || function (x) {\n  // eslint-disable-next-line no-self-compare\n  return x !== x;\n};\n\nexport default NumberIsNaN;\n","export function CreateArrayFromList<T extends any[]>(elements: T): T {\n  // We use arrays to represent lists, so this is basically a no-op.\n  // Do a slice though just in case we happen to depend on the unique-ness.\n  return elements.slice() as T;\n}\n\nexport function CopyDataBlockBytes(dest: ArrayBuffer,\n                                   destOffset: number,\n                                   src: ArrayBuffer,\n                                   srcOffset: number,\n                                   n: number) {\n  new Uint8Array(dest).set(new Uint8Array(src, srcOffset, n), destOffset);\n}\n\n// Not implemented correctly\nexport function TransferArrayBuffer<T extends ArrayBufferLike>(O: T): T {\n  return O;\n}\n\n// Not implemented correctly\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nexport function CanTransferArrayBuffer(O: ArrayBufferLike): boolean {\n  return true;\n}\n\n// Not implemented correctly\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nexport function IsDetachedBuffer(O: ArrayBufferLike): boolean {\n  return false;\n}\n\nexport function ArrayBufferSlice(buffer: ArrayBufferLike, begin: number, end: number): ArrayBufferLike {\n  // ArrayBuffer.prototype.slice is not available on IE10\n  // https://www.caniuse.com/mdn-javascript_builtins_arraybuffer_slice\n  if (buffer.slice) {\n    return buffer.slice(begin, end);\n  }\n  const length = end - begin;\n  const slice = new ArrayBuffer(length);\n  CopyDataBlockBytes(slice, 0, buffer, begin, length);\n  return slice;\n}\n","import NumberIsNaN from '../../stub/number-isnan';\nimport { ArrayBufferSlice } from './ecmascript';\n\nexport function IsNonNegativeNumber(v: number): boolean {\n  if (typeof v !== 'number') {\n    return false;\n  }\n\n  if (NumberIsNaN(v)) {\n    return false;\n  }\n\n  if (v < 0) {\n    return false;\n  }\n\n  return true;\n}\n\nexport function CloneAsUint8Array(O: ArrayBufferView): Uint8Array {\n  const buffer = ArrayBufferSlice(O.buffer, O.byteOffset, O.byteOffset + O.byteLength);\n  return new Uint8Array(buffer);\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport { IsNonNegativeNumber } from './miscellaneous';\n\nexport interface QueueContainer<T> {\n  _queue: SimpleQueue<T>;\n  _queueTotalSize: number;\n}\n\nexport interface QueuePair<T> {\n  value: T;\n  size: number;\n}\n\nexport function DequeueValue<T>(container: QueueContainer<QueuePair<T>>): T {\n  assert('_queue' in container && '_queueTotalSize' in container);\n  assert(container._queue.length > 0);\n\n  const pair = container._queue.shift()!;\n  container._queueTotalSize -= pair.size;\n  if (container._queueTotalSize < 0) {\n    container._queueTotalSize = 0;\n  }\n\n  return pair.value;\n}\n\nexport function EnqueueValueWithSize<T>(container: QueueContainer<QueuePair<T>>, value: T, size: number) {\n  assert('_queue' in container && '_queueTotalSize' in container);\n\n  if (!IsNonNegativeNumber(size) || size === Infinity) {\n    throw new RangeError('Size must be a finite, non-NaN, non-negative number.');\n  }\n\n  container._queue.push({ value, size });\n  container._queueTotalSize += size;\n}\n\nexport function PeekQueueValue<T>(container: QueueContainer<QueuePair<T>>): T {\n  assert('_queue' in container && '_queueTotalSize' in container);\n  assert(container._queue.length > 0);\n\n  const pair = container._queue.peek();\n  return pair.value;\n}\n\nexport function ResetQueue<T>(container: QueueContainer<T>) {\n  assert('_queue' in container && '_queueTotalSize' in container);\n\n  container._queue = new SimpleQueue<T>();\n  container._queueTotalSize = 0;\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport { ResetQueue } from '../abstract-ops/queue-with-sizes';\nimport {\n  ReadableStreamAddReadRequest,\n  ReadableStreamFulfillReadRequest,\n  ReadableStreamGetNumReadRequests,\n  ReadableStreamHasDefaultReader,\n  ReadRequest\n} from './default-reader';\nimport {\n  ReadableStreamAddReadIntoRequest,\n  ReadableStreamFulfillReadIntoRequest,\n  ReadableStreamGetNumReadIntoRequests,\n  ReadableStreamHasBYOBReader,\n  ReadIntoRequest\n} from './byob-reader';\nimport NumberIsInteger from '../../stub/number-isinteger';\nimport {\n  IsReadableStreamLocked,\n  ReadableByteStream,\n  ReadableStreamClose,\n  ReadableStreamError\n} from '../readable-stream';\nimport { ValidatedUnderlyingByteSource } from './underlying-source';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport {\n  ArrayBufferSlice,\n  CanTransferArrayBuffer,\n  CopyDataBlockBytes,\n  IsDetachedBuffer,\n  TransferArrayBuffer\n} from '../abstract-ops/ecmascript';\nimport { CancelSteps, PullSteps } from '../abstract-ops/internal-methods';\nimport { promiseResolvedWith, uponPromise } from '../helpers/webidl';\nimport { assertRequiredArgument, convertUnsignedLongLongWithEnforceRange } from '../validators/basic';\n\n/**\n * A pull-into request in a {@link ReadableByteStreamController}.\n *\n * @public\n */\nexport class ReadableStreamBYOBRequest {\n  /** @internal */\n  _associatedReadableByteStreamController!: ReadableByteStreamController;\n  /** @internal */\n  _view!: ArrayBufferView | null;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the view for writing in to, or `null` if the BYOB request has already been responded to.\n   */\n  get view(): ArrayBufferView | null {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('view');\n    }\n\n    return this._view;\n  }\n\n  /**\n   * Indicates to the associated readable byte stream that `bytesWritten` bytes were written into\n   * {@link ReadableStreamBYOBRequest.view | view}, causing the result be surfaced to the consumer.\n   *\n   * After this method is called, {@link ReadableStreamBYOBRequest.view | view} will be transferred and no longer\n   * modifiable.\n   */\n  respond(bytesWritten: number): void;\n  respond(bytesWritten: number | undefined): void {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('respond');\n    }\n    assertRequiredArgument(bytesWritten, 1, 'respond');\n    bytesWritten = convertUnsignedLongLongWithEnforceRange(bytesWritten, 'First parameter');\n\n    if (this._associatedReadableByteStreamController === undefined) {\n      throw new TypeError('This BYOB request has been invalidated');\n    }\n\n    if (IsDetachedBuffer(this._view!.buffer)) {\n      throw new TypeError(`The BYOB request's buffer has been detached and so cannot be used as a response`);\n    }\n\n    assert(this._view!.byteLength > 0);\n    assert(this._view!.buffer.byteLength > 0);\n\n    ReadableByteStreamControllerRespond(this._associatedReadableByteStreamController, bytesWritten);\n  }\n\n  /**\n   * Indicates to the associated readable byte stream that instead of writing into\n   * {@link ReadableStreamBYOBRequest.view | view}, the underlying byte source is providing a new `ArrayBufferView`,\n   * which will be given to the consumer of the readable byte stream.\n   *\n   * After this method is called, `view` will be transferred and no longer modifiable.\n   */\n  respondWithNewView(view: ArrayBufferView): void;\n  respondWithNewView(view: ArrayBufferView | undefined): void {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('respondWithNewView');\n    }\n    assertRequiredArgument(view, 1, 'respondWithNewView');\n\n    if (!ArrayBuffer.isView(view)) {\n      throw new TypeError('You can only respond with array buffer views');\n    }\n\n    if (this._associatedReadableByteStreamController === undefined) {\n      throw new TypeError('This BYOB request has been invalidated');\n    }\n\n    if (IsDetachedBuffer(view.buffer)) {\n      throw new TypeError('The given view\\'s buffer has been detached and so cannot be used as a response');\n    }\n\n    ReadableByteStreamControllerRespondWithNewView(this._associatedReadableByteStreamController, view);\n  }\n}\n\nObject.defineProperties(ReadableStreamBYOBRequest.prototype, {\n  respond: { enumerable: true },\n  respondWithNewView: { enumerable: true },\n  view: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamBYOBRequest.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamBYOBRequest',\n    configurable: true\n  });\n}\n\ninterface ArrayBufferViewConstructor<T extends ArrayBufferView = ArrayBufferView> {\n  new(buffer: ArrayBufferLike, byteOffset: number, length?: number): T;\n\n  readonly prototype: T;\n  readonly BYTES_PER_ELEMENT: number;\n}\n\ninterface ByteQueueElement {\n  buffer: ArrayBufferLike;\n  byteOffset: number;\n  byteLength: number;\n}\n\ntype PullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> =\n  DefaultPullIntoDescriptor\n  | BYOBPullIntoDescriptor<T>;\n\ninterface DefaultPullIntoDescriptor {\n  buffer: ArrayBufferLike;\n  bufferByteLength: number;\n  byteOffset: number;\n  byteLength: number;\n  bytesFilled: number;\n  elementSize: number;\n  viewConstructor: ArrayBufferViewConstructor<Uint8Array>;\n  readerType: 'default';\n}\n\ninterface BYOBPullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> {\n  buffer: ArrayBufferLike;\n  bufferByteLength: number;\n  byteOffset: number;\n  byteLength: number;\n  bytesFilled: number;\n  elementSize: number;\n  viewConstructor: ArrayBufferViewConstructor<T>;\n  readerType: 'byob';\n}\n\n/**\n * Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue.\n *\n * @public\n */\nexport class ReadableByteStreamController {\n  /** @internal */\n  _controlledReadableByteStream!: ReadableByteStream;\n  /** @internal */\n  _queue!: SimpleQueue<ByteQueueElement>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _closeRequested!: boolean;\n  /** @internal */\n  _pullAgain!: boolean;\n  /** @internal */\n  _pulling !: boolean;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _pullAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _cancelAlgorithm!: (reason: any) => Promise<void>;\n  /** @internal */\n  _autoAllocateChunkSize: number | undefined;\n  /** @internal */\n  _byobRequest: ReadableStreamBYOBRequest | null;\n  /** @internal */\n  _pendingPullIntos!: SimpleQueue<PullIntoDescriptor>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the current BYOB pull request, or `null` if there isn't one.\n   */\n  get byobRequest(): ReadableStreamBYOBRequest | null {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('byobRequest');\n    }\n\n    return ReadableByteStreamControllerGetBYOBRequest(this);\n  }\n\n  /**\n   * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is\n   * over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure.\n   */\n  get desiredSize(): number | null {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('desiredSize');\n    }\n\n    return ReadableByteStreamControllerGetDesiredSize(this);\n  }\n\n  /**\n   * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from\n   * the stream, but once those are read, the stream will become closed.\n   */\n  close(): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('close');\n    }\n\n    if (this._closeRequested) {\n      throw new TypeError('The stream has already been closed; do not close it again!');\n    }\n\n    const state = this._controlledReadableByteStream._state;\n    if (state !== 'readable') {\n      throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be closed`);\n    }\n\n    ReadableByteStreamControllerClose(this);\n  }\n\n  /**\n   * Enqueues the given chunk chunk in the controlled readable stream.\n   * The chunk has to be an `ArrayBufferView` instance, or else a `TypeError` will be thrown.\n   */\n  enqueue(chunk: ArrayBufferView): void;\n  enqueue(chunk: ArrayBufferView | undefined): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('enqueue');\n    }\n\n    assertRequiredArgument(chunk, 1, 'enqueue');\n    if (!ArrayBuffer.isView(chunk)) {\n      throw new TypeError('chunk must be an array buffer view');\n    }\n    if (chunk.byteLength === 0) {\n      throw new TypeError('chunk must have non-zero byteLength');\n    }\n    if (chunk.buffer.byteLength === 0) {\n      throw new TypeError(`chunk's buffer must have non-zero byteLength`);\n    }\n\n    if (this._closeRequested) {\n      throw new TypeError('stream is closed or draining');\n    }\n\n    const state = this._controlledReadableByteStream._state;\n    if (state !== 'readable') {\n      throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be enqueued to`);\n    }\n\n    ReadableByteStreamControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.\n   */\n  error(e: any = undefined): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('error');\n    }\n\n    ReadableByteStreamControllerError(this, e);\n  }\n\n  /** @internal */\n  [CancelSteps](reason: any): Promise<void> {\n    ReadableByteStreamControllerClearPendingPullIntos(this);\n\n    ResetQueue(this);\n\n    const result = this._cancelAlgorithm(reason);\n    ReadableByteStreamControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [PullSteps](readRequest: ReadRequest<Uint8Array>): void {\n    const stream = this._controlledReadableByteStream;\n    assert(ReadableStreamHasDefaultReader(stream));\n\n    if (this._queueTotalSize > 0) {\n      assert(ReadableStreamGetNumReadRequests(stream) === 0);\n\n      const entry = this._queue.shift()!;\n      this._queueTotalSize -= entry.byteLength;\n\n      ReadableByteStreamControllerHandleQueueDrain(this);\n\n      const view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);\n\n      readRequest._chunkSteps(view);\n      return;\n    }\n\n    const autoAllocateChunkSize = this._autoAllocateChunkSize;\n    if (autoAllocateChunkSize !== undefined) {\n      let buffer: ArrayBuffer;\n      try {\n        buffer = new ArrayBuffer(autoAllocateChunkSize);\n      } catch (bufferE) {\n        readRequest._errorSteps(bufferE);\n        return;\n      }\n\n      const pullIntoDescriptor: DefaultPullIntoDescriptor = {\n        buffer,\n        bufferByteLength: autoAllocateChunkSize,\n        byteOffset: 0,\n        byteLength: autoAllocateChunkSize,\n        bytesFilled: 0,\n        elementSize: 1,\n        viewConstructor: Uint8Array,\n        readerType: 'default'\n      };\n\n      this._pendingPullIntos.push(pullIntoDescriptor);\n    }\n\n    ReadableStreamAddReadRequest(stream, readRequest);\n    ReadableByteStreamControllerCallPullIfNeeded(this);\n  }\n}\n\nObject.defineProperties(ReadableByteStreamController.prototype, {\n  close: { enumerable: true },\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  byobRequest: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableByteStreamController.prototype, Symbol.toStringTag, {\n    value: 'ReadableByteStreamController',\n    configurable: true\n  });\n}\n\n// Abstract operations for the ReadableByteStreamController.\n\nexport function IsReadableByteStreamController(x: any): x is ReadableByteStreamController {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableByteStream')) {\n    return false;\n  }\n\n  return x instanceof ReadableByteStreamController;\n}\n\nfunction IsReadableStreamBYOBRequest(x: any): x is ReadableStreamBYOBRequest {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_associatedReadableByteStreamController')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamBYOBRequest;\n}\n\nfunction ReadableByteStreamControllerCallPullIfNeeded(controller: ReadableByteStreamController): void {\n  const shouldPull = ReadableByteStreamControllerShouldCallPull(controller);\n  if (!shouldPull) {\n    return;\n  }\n\n  if (controller._pulling) {\n    controller._pullAgain = true;\n    return;\n  }\n\n  assert(!controller._pullAgain);\n\n  controller._pulling = true;\n\n  // TODO: Test controller argument\n  const pullPromise = controller._pullAlgorithm();\n  uponPromise(\n    pullPromise,\n    () => {\n      controller._pulling = false;\n\n      if (controller._pullAgain) {\n        controller._pullAgain = false;\n        ReadableByteStreamControllerCallPullIfNeeded(controller);\n      }\n    },\n    e => {\n      ReadableByteStreamControllerError(controller, e);\n    }\n  );\n}\n\nfunction ReadableByteStreamControllerClearPendingPullIntos(controller: ReadableByteStreamController) {\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n  controller._pendingPullIntos = new SimpleQueue();\n}\n\nfunction ReadableByteStreamControllerCommitPullIntoDescriptor<T extends ArrayBufferView>(\n  stream: ReadableByteStream,\n  pullIntoDescriptor: PullIntoDescriptor<T>\n) {\n  assert(stream._state !== 'errored');\n\n  let done = false;\n  if (stream._state === 'closed') {\n    assert(pullIntoDescriptor.bytesFilled === 0);\n    done = true;\n  }\n\n  const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);\n  if (pullIntoDescriptor.readerType === 'default') {\n    ReadableStreamFulfillReadRequest(stream, filledView as unknown as Uint8Array, done);\n  } else {\n    assert(pullIntoDescriptor.readerType === 'byob');\n    ReadableStreamFulfillReadIntoRequest(stream, filledView, done);\n  }\n}\n\nfunction ReadableByteStreamControllerConvertPullIntoDescriptor<T extends ArrayBufferView>(\n  pullIntoDescriptor: PullIntoDescriptor<T>\n): T {\n  const bytesFilled = pullIntoDescriptor.bytesFilled;\n  const elementSize = pullIntoDescriptor.elementSize;\n\n  assert(bytesFilled <= pullIntoDescriptor.byteLength);\n  assert(bytesFilled % elementSize === 0);\n\n  return new pullIntoDescriptor.viewConstructor(\n    pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize) as T;\n}\n\nfunction ReadableByteStreamControllerEnqueueChunkToQueue(controller: ReadableByteStreamController,\n                                                         buffer: ArrayBufferLike,\n                                                         byteOffset: number,\n                                                         byteLength: number) {\n  controller._queue.push({ buffer, byteOffset, byteLength });\n  controller._queueTotalSize += byteLength;\n}\n\nfunction ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller: ReadableByteStreamController,\n                                                                     pullIntoDescriptor: PullIntoDescriptor) {\n  const elementSize = pullIntoDescriptor.elementSize;\n\n  const currentAlignedBytes = pullIntoDescriptor.bytesFilled - pullIntoDescriptor.bytesFilled % elementSize;\n\n  const maxBytesToCopy = Math.min(controller._queueTotalSize,\n                                  pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled);\n  const maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;\n  const maxAlignedBytes = maxBytesFilled - maxBytesFilled % elementSize;\n\n  let totalBytesToCopyRemaining = maxBytesToCopy;\n  let ready = false;\n  if (maxAlignedBytes > currentAlignedBytes) {\n    totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled;\n    ready = true;\n  }\n\n  const queue = controller._queue;\n\n  while (totalBytesToCopyRemaining > 0) {\n    const headOfQueue = queue.peek();\n\n    const bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength);\n\n    const destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n    CopyDataBlockBytes(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy);\n\n    if (headOfQueue.byteLength === bytesToCopy) {\n      queue.shift();\n    } else {\n      headOfQueue.byteOffset += bytesToCopy;\n      headOfQueue.byteLength -= bytesToCopy;\n    }\n    controller._queueTotalSize -= bytesToCopy;\n\n    ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor);\n\n    totalBytesToCopyRemaining -= bytesToCopy;\n  }\n\n  if (!ready) {\n    assert(controller._queueTotalSize === 0);\n    assert(pullIntoDescriptor.bytesFilled > 0);\n    assert(pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize);\n  }\n\n  return ready;\n}\n\nfunction ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller: ReadableByteStreamController,\n                                                                size: number,\n                                                                pullIntoDescriptor: PullIntoDescriptor) {\n  assert(controller._pendingPullIntos.length === 0 || controller._pendingPullIntos.peek() === pullIntoDescriptor);\n  assert(controller._byobRequest === null);\n  pullIntoDescriptor.bytesFilled += size;\n}\n\nfunction ReadableByteStreamControllerHandleQueueDrain(controller: ReadableByteStreamController) {\n  assert(controller._controlledReadableByteStream._state === 'readable');\n\n  if (controller._queueTotalSize === 0 && controller._closeRequested) {\n    ReadableByteStreamControllerClearAlgorithms(controller);\n    ReadableStreamClose(controller._controlledReadableByteStream);\n  } else {\n    ReadableByteStreamControllerCallPullIfNeeded(controller);\n  }\n}\n\nfunction ReadableByteStreamControllerInvalidateBYOBRequest(controller: ReadableByteStreamController) {\n  if (controller._byobRequest === null) {\n    return;\n  }\n\n  controller._byobRequest._associatedReadableByteStreamController = undefined!;\n  controller._byobRequest._view = null!;\n  controller._byobRequest = null;\n}\n\nfunction ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller: ReadableByteStreamController) {\n  assert(!controller._closeRequested);\n\n  while (controller._pendingPullIntos.length > 0) {\n    if (controller._queueTotalSize === 0) {\n      return;\n    }\n\n    const pullIntoDescriptor = controller._pendingPullIntos.peek();\n\n    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {\n      ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n      ReadableByteStreamControllerCommitPullIntoDescriptor(\n        controller._controlledReadableByteStream,\n        pullIntoDescriptor\n      );\n    }\n  }\n}\n\nexport function ReadableByteStreamControllerPullInto<T extends ArrayBufferView>(\n  controller: ReadableByteStreamController,\n  view: T,\n  readIntoRequest: ReadIntoRequest<T>\n): void {\n  const stream = controller._controlledReadableByteStream;\n\n  let elementSize = 1;\n  if (view.constructor !== DataView) {\n    elementSize = (view.constructor as ArrayBufferViewConstructor<T>).BYTES_PER_ELEMENT;\n  }\n\n  const ctor = view.constructor as ArrayBufferViewConstructor<T>;\n\n  // try {\n  const buffer = TransferArrayBuffer(view.buffer);\n  // } catch (e) {\n  //   readIntoRequest._errorSteps(e);\n  //   return;\n  // }\n\n  const pullIntoDescriptor: BYOBPullIntoDescriptor<T> = {\n    buffer,\n    bufferByteLength: buffer.byteLength,\n    byteOffset: view.byteOffset,\n    byteLength: view.byteLength,\n    bytesFilled: 0,\n    elementSize,\n    viewConstructor: ctor,\n    readerType: 'byob'\n  };\n\n  if (controller._pendingPullIntos.length > 0) {\n    controller._pendingPullIntos.push(pullIntoDescriptor);\n\n    // No ReadableByteStreamControllerCallPullIfNeeded() call since:\n    // - No change happens on desiredSize\n    // - The source has already been notified of that there's at least 1 pending read(view)\n\n    ReadableStreamAddReadIntoRequest(stream, readIntoRequest);\n    return;\n  }\n\n  if (stream._state === 'closed') {\n    const emptyView = new ctor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0);\n    readIntoRequest._closeSteps(emptyView);\n    return;\n  }\n\n  if (controller._queueTotalSize > 0) {\n    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {\n      const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);\n\n      ReadableByteStreamControllerHandleQueueDrain(controller);\n\n      readIntoRequest._chunkSteps(filledView);\n      return;\n    }\n\n    if (controller._closeRequested) {\n      const e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n      ReadableByteStreamControllerError(controller, e);\n\n      readIntoRequest._errorSteps(e);\n      return;\n    }\n  }\n\n  controller._pendingPullIntos.push(pullIntoDescriptor);\n\n  ReadableStreamAddReadIntoRequest<T>(stream, readIntoRequest);\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nfunction ReadableByteStreamControllerRespondInClosedState(controller: ReadableByteStreamController,\n                                                          firstDescriptor: PullIntoDescriptor) {\n  assert(firstDescriptor.bytesFilled === 0);\n\n  const stream = controller._controlledReadableByteStream;\n  if (ReadableStreamHasBYOBReader(stream)) {\n    while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n      const pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);\n      ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);\n    }\n  }\n}\n\nfunction ReadableByteStreamControllerRespondInReadableState(controller: ReadableByteStreamController,\n                                                            bytesWritten: number,\n                                                            pullIntoDescriptor: PullIntoDescriptor) {\n  assert(pullIntoDescriptor.bytesFilled + bytesWritten <= pullIntoDescriptor.byteLength);\n\n  ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor);\n\n  if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {\n    return;\n  }\n\n  ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n  const remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize;\n  if (remainderSize > 0) {\n    const end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n    const remainder = ArrayBufferSlice(pullIntoDescriptor.buffer, end - remainderSize, end);\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength);\n  }\n\n  pullIntoDescriptor.bytesFilled -= remainderSize;\n  ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);\n\n  ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n}\n\nfunction ReadableByteStreamControllerRespondInternal(controller: ReadableByteStreamController, bytesWritten: number) {\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  assert(CanTransferArrayBuffer(firstDescriptor.buffer));\n\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n\n  const state = controller._controlledReadableByteStream._state;\n  if (state === 'closed') {\n    assert(bytesWritten === 0);\n    ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor);\n  } else {\n    assert(state === 'readable');\n    assert(bytesWritten > 0);\n    ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);\n  }\n\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nfunction ReadableByteStreamControllerShiftPendingPullInto(\n  controller: ReadableByteStreamController\n): PullIntoDescriptor {\n  assert(controller._byobRequest === null);\n  const descriptor = controller._pendingPullIntos.shift()!;\n  return descriptor;\n}\n\nfunction ReadableByteStreamControllerShouldCallPull(controller: ReadableByteStreamController): boolean {\n  const stream = controller._controlledReadableByteStream;\n\n  if (stream._state !== 'readable') {\n    return false;\n  }\n\n  if (controller._closeRequested) {\n    return false;\n  }\n\n  if (!controller._started) {\n    return false;\n  }\n\n  if (ReadableStreamHasDefaultReader(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    return true;\n  }\n\n  if (ReadableStreamHasBYOBReader(stream) && ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n    return true;\n  }\n\n  const desiredSize = ReadableByteStreamControllerGetDesiredSize(controller);\n  assert(desiredSize !== null);\n  if (desiredSize! > 0) {\n    return true;\n  }\n\n  return false;\n}\n\nfunction ReadableByteStreamControllerClearAlgorithms(controller: ReadableByteStreamController) {\n  controller._pullAlgorithm = undefined!;\n  controller._cancelAlgorithm = undefined!;\n}\n\n// A client of ReadableByteStreamController may use these functions directly to bypass state check.\n\nexport function ReadableByteStreamControllerClose(controller: ReadableByteStreamController) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (controller._closeRequested || stream._state !== 'readable') {\n    return;\n  }\n\n  if (controller._queueTotalSize > 0) {\n    controller._closeRequested = true;\n\n    return;\n  }\n\n  if (controller._pendingPullIntos.length > 0) {\n    const firstPendingPullInto = controller._pendingPullIntos.peek();\n    if (firstPendingPullInto.bytesFilled > 0) {\n      const e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n      ReadableByteStreamControllerError(controller, e);\n\n      throw e;\n    }\n  }\n\n  ReadableByteStreamControllerClearAlgorithms(controller);\n  ReadableStreamClose(stream);\n}\n\nexport function ReadableByteStreamControllerEnqueue(controller: ReadableByteStreamController, chunk: ArrayBufferView) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (controller._closeRequested || stream._state !== 'readable') {\n    return;\n  }\n\n  const buffer = chunk.buffer;\n  const byteOffset = chunk.byteOffset;\n  const byteLength = chunk.byteLength;\n  if (IsDetachedBuffer(buffer)) {\n    throw new TypeError('chunk\\'s buffer is detached and so cannot be enqueued');\n  }\n  const transferredBuffer = TransferArrayBuffer(buffer);\n\n  if (controller._pendingPullIntos.length > 0) {\n    const firstPendingPullInto = controller._pendingPullIntos.peek();\n    if (IsDetachedBuffer(firstPendingPullInto.buffer)) {\n      throw new TypeError(\n        'The BYOB request\\'s buffer has been detached and so cannot be filled with an enqueued chunk'\n      );\n    }\n    firstPendingPullInto.buffer = TransferArrayBuffer(firstPendingPullInto.buffer);\n  }\n\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n\n  if (ReadableStreamHasDefaultReader(stream)) {\n    if (ReadableStreamGetNumReadRequests(stream) === 0) {\n      assert(controller._pendingPullIntos.length === 0);\n      ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n    } else {\n      assert(controller._queue.length === 0);\n      if (controller._pendingPullIntos.length > 0) {\n        assert(controller._pendingPullIntos.peek().readerType === 'default');\n        ReadableByteStreamControllerShiftPendingPullInto(controller);\n      }\n      const transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength);\n      ReadableStreamFulfillReadRequest(stream, transferredView, false);\n    }\n  } else if (ReadableStreamHasBYOBReader(stream)) {\n    // TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully.\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n    ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n  } else {\n    assert(!IsReadableStreamLocked(stream));\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n  }\n\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nexport function ReadableByteStreamControllerError(controller: ReadableByteStreamController, e: any) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (stream._state !== 'readable') {\n    return;\n  }\n\n  ReadableByteStreamControllerClearPendingPullIntos(controller);\n\n  ResetQueue(controller);\n  ReadableByteStreamControllerClearAlgorithms(controller);\n  ReadableStreamError(stream, e);\n}\n\nexport function ReadableByteStreamControllerGetBYOBRequest(\n  controller: ReadableByteStreamController\n): ReadableStreamBYOBRequest | null {\n  if (controller._byobRequest === null && controller._pendingPullIntos.length > 0) {\n    const firstDescriptor = controller._pendingPullIntos.peek();\n    const view = new Uint8Array(firstDescriptor.buffer,\n                                firstDescriptor.byteOffset + firstDescriptor.bytesFilled,\n                                firstDescriptor.byteLength - firstDescriptor.bytesFilled);\n\n    const byobRequest: ReadableStreamBYOBRequest = Object.create(ReadableStreamBYOBRequest.prototype);\n    SetUpReadableStreamBYOBRequest(byobRequest, controller, view);\n    controller._byobRequest = byobRequest;\n  }\n  return controller._byobRequest;\n}\n\nfunction ReadableByteStreamControllerGetDesiredSize(controller: ReadableByteStreamController): number | null {\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'errored') {\n    return null;\n  }\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\nexport function ReadableByteStreamControllerRespond(controller: ReadableByteStreamController, bytesWritten: number) {\n  assert(controller._pendingPullIntos.length > 0);\n\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'closed') {\n    if (bytesWritten !== 0) {\n      throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream');\n    }\n  } else {\n    assert(state === 'readable');\n    if (bytesWritten === 0) {\n      throw new TypeError('bytesWritten must be greater than 0 when calling respond() on a readable stream');\n    }\n    if (firstDescriptor.bytesFilled + bytesWritten > firstDescriptor.byteLength) {\n      throw new RangeError('bytesWritten out of range');\n    }\n  }\n\n  firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer);\n\n  ReadableByteStreamControllerRespondInternal(controller, bytesWritten);\n}\n\nexport function ReadableByteStreamControllerRespondWithNewView(controller: ReadableByteStreamController,\n                                                               view: ArrayBufferView) {\n  assert(controller._pendingPullIntos.length > 0);\n  assert(!IsDetachedBuffer(view.buffer));\n\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'closed') {\n    if (view.byteLength !== 0) {\n      throw new TypeError('The view\\'s length must be 0 when calling respondWithNewView() on a closed stream');\n    }\n  } else {\n    assert(state === 'readable');\n    if (view.byteLength === 0) {\n      throw new TypeError(\n        'The view\\'s length must be greater than 0 when calling respondWithNewView() on a readable stream'\n      );\n    }\n  }\n\n  if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) {\n    throw new RangeError('The region specified by view does not match byobRequest');\n  }\n  if (firstDescriptor.bufferByteLength !== view.buffer.byteLength) {\n    throw new RangeError('The buffer of view has different capacity than byobRequest');\n  }\n  if (firstDescriptor.bytesFilled + view.byteLength > firstDescriptor.byteLength) {\n    throw new RangeError('The region specified by view is larger than byobRequest');\n  }\n\n  const viewByteLength = view.byteLength;\n  firstDescriptor.buffer = TransferArrayBuffer(view.buffer);\n  ReadableByteStreamControllerRespondInternal(controller, viewByteLength);\n}\n\nexport function SetUpReadableByteStreamController(stream: ReadableByteStream,\n                                                  controller: ReadableByteStreamController,\n                                                  startAlgorithm: () => void | PromiseLike<void>,\n                                                  pullAlgorithm: () => Promise<void>,\n                                                  cancelAlgorithm: (reason: any) => Promise<void>,\n                                                  highWaterMark: number,\n                                                  autoAllocateChunkSize: number | undefined) {\n  assert(stream._readableStreamController === undefined);\n  if (autoAllocateChunkSize !== undefined) {\n    assert(NumberIsInteger(autoAllocateChunkSize));\n    assert(autoAllocateChunkSize > 0);\n  }\n\n  controller._controlledReadableByteStream = stream;\n\n  controller._pullAgain = false;\n  controller._pulling = false;\n\n  controller._byobRequest = null;\n\n  // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n  controller._queue = controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._closeRequested = false;\n  controller._started = false;\n\n  controller._strategyHWM = highWaterMark;\n\n  controller._pullAlgorithm = pullAlgorithm;\n  controller._cancelAlgorithm = cancelAlgorithm;\n\n  controller._autoAllocateChunkSize = autoAllocateChunkSize;\n\n  controller._pendingPullIntos = new SimpleQueue();\n\n  stream._readableStreamController = controller;\n\n  const startResult = startAlgorithm();\n  uponPromise(\n    promiseResolvedWith(startResult),\n    () => {\n      controller._started = true;\n\n      assert(!controller._pulling);\n      assert(!controller._pullAgain);\n\n      ReadableByteStreamControllerCallPullIfNeeded(controller);\n    },\n    r => {\n      ReadableByteStreamControllerError(controller, r);\n    }\n  );\n}\n\nexport function SetUpReadableByteStreamControllerFromUnderlyingSource(\n  stream: ReadableByteStream,\n  underlyingByteSource: ValidatedUnderlyingByteSource,\n  highWaterMark: number\n) {\n  const controller: ReadableByteStreamController = Object.create(ReadableByteStreamController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let pullAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let cancelAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingByteSource.start !== undefined) {\n    startAlgorithm = () => underlyingByteSource.start!(controller);\n  }\n  if (underlyingByteSource.pull !== undefined) {\n    pullAlgorithm = () => underlyingByteSource.pull!(controller);\n  }\n  if (underlyingByteSource.cancel !== undefined) {\n    cancelAlgorithm = reason => underlyingByteSource.cancel!(reason);\n  }\n\n  const autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;\n  if (autoAllocateChunkSize === 0) {\n    throw new TypeError('autoAllocateChunkSize must be greater than 0');\n  }\n\n  SetUpReadableByteStreamController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize\n  );\n}\n\nfunction SetUpReadableStreamBYOBRequest(request: ReadableStreamBYOBRequest,\n                                        controller: ReadableByteStreamController,\n                                        view: ArrayBufferView) {\n  assert(IsReadableByteStreamController(controller));\n  assert(typeof view === 'object');\n  assert(ArrayBuffer.isView(view));\n  assert(!IsDetachedBuffer(view.buffer));\n  request._associatedReadableByteStreamController = controller;\n  request._view = view;\n}\n\n// Helper functions for the ReadableStreamBYOBRequest.\n\nfunction byobRequestBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamBYOBRequest.prototype.${name} can only be used on a ReadableStreamBYOBRequest`);\n}\n\n// Helper functions for the ReadableByteStreamController.\n\nfunction byteStreamControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableByteStreamController.prototype.${name} can only be used on a ReadableByteStreamController`);\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericInitialize,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport { IsReadableStreamLocked, ReadableByteStream, ReadableStream } from '../readable-stream';\nimport {\n  IsReadableByteStreamController,\n  ReadableByteStreamController,\n  ReadableByteStreamControllerPullInto\n} from './byte-stream-controller';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { newPromise, promiseRejectedWith } from '../helpers/webidl';\nimport { assertRequiredArgument } from '../validators/basic';\nimport { assertReadableStream } from '../validators/readable-stream';\nimport { IsDetachedBuffer } from '../abstract-ops/ecmascript';\n\n/**\n * A result returned by {@link ReadableStreamBYOBReader.read}.\n *\n * @public\n */\nexport type ReadableStreamBYOBReadResult<T extends ArrayBufferView> = {\n  done: false;\n  value: T;\n} | {\n  done: true;\n  value: T | undefined;\n};\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamBYOBReader(stream: ReadableByteStream): ReadableStreamBYOBReader {\n  return new ReadableStreamBYOBReader(stream);\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamAddReadIntoRequest<T extends ArrayBufferView>(stream: ReadableByteStream,\n                                                                            readIntoRequest: ReadIntoRequest<T>): void {\n  assert(IsReadableStreamBYOBReader(stream._reader));\n  assert(stream._state === 'readable' || stream._state === 'closed');\n\n  (stream._reader! as ReadableStreamBYOBReader)._readIntoRequests.push(readIntoRequest);\n}\n\nexport function ReadableStreamFulfillReadIntoRequest(stream: ReadableByteStream,\n                                                     chunk: ArrayBufferView,\n                                                     done: boolean) {\n  const reader = stream._reader as ReadableStreamBYOBReader;\n\n  assert(reader._readIntoRequests.length > 0);\n\n  const readIntoRequest = reader._readIntoRequests.shift()!;\n  if (done) {\n    readIntoRequest._closeSteps(chunk);\n  } else {\n    readIntoRequest._chunkSteps(chunk);\n  }\n}\n\nexport function ReadableStreamGetNumReadIntoRequests(stream: ReadableByteStream): number {\n  return (stream._reader as ReadableStreamBYOBReader)._readIntoRequests.length;\n}\n\nexport function ReadableStreamHasBYOBReader(stream: ReadableByteStream): boolean {\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return false;\n  }\n\n  if (!IsReadableStreamBYOBReader(reader)) {\n    return false;\n  }\n\n  return true;\n}\n\n// Readers\n\nexport interface ReadIntoRequest<T extends ArrayBufferView> {\n  _chunkSteps(chunk: T): void;\n\n  _closeSteps(chunk: T | undefined): void;\n\n  _errorSteps(e: any): void;\n}\n\n/**\n * A BYOB reader vended by a {@link ReadableStream}.\n *\n * @public\n */\nexport class ReadableStreamBYOBReader {\n  /** @internal */\n  _ownerReadableStream!: ReadableByteStream;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readIntoRequests: SimpleQueue<ReadIntoRequest<any>>;\n\n  constructor(stream: ReadableByteStream) {\n    assertRequiredArgument(stream, 1, 'ReadableStreamBYOBReader');\n    assertReadableStream(stream, 'First parameter');\n\n    if (IsReadableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n    }\n\n    if (!IsReadableByteStreamController(stream._readableStreamController)) {\n      throw new TypeError('Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte ' +\n        'source');\n    }\n\n    ReadableStreamReaderGenericInitialize(this, stream);\n\n    this._readIntoRequests = new SimpleQueue();\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or\n   * the reader's lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('cancel'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('cancel'));\n    }\n\n    return ReadableStreamReaderGenericCancel(this, reason);\n  }\n\n  /**\n   * Attempts to reads bytes into view, and returns a promise resolved with the result.\n   *\n   * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.\n   */\n  read<T extends ArrayBufferView>(view: T): Promise<ReadableStreamBYOBReadResult<T>> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('read'));\n    }\n\n    if (!ArrayBuffer.isView(view)) {\n      return promiseRejectedWith(new TypeError('view must be an array buffer view'));\n    }\n    if (view.byteLength === 0) {\n      return promiseRejectedWith(new TypeError('view must have non-zero byteLength'));\n    }\n    if (view.buffer.byteLength === 0) {\n      return promiseRejectedWith(new TypeError(`view's buffer must have non-zero byteLength`));\n    }\n    if (IsDetachedBuffer(view.buffer)) {\n      return promiseRejectedWith(new TypeError('view\\'s buffer has been detached'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('read from'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamBYOBReadResult<T>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamBYOBReadResult<T>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readIntoRequest: ReadIntoRequest<T> = {\n      _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),\n      _closeSteps: chunk => resolvePromise({ value: chunk, done: true }),\n      _errorSteps: e => rejectPromise(e)\n    };\n    ReadableStreamBYOBReaderRead(this, view, readIntoRequest);\n    return promise;\n  }\n\n  /**\n   * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.\n   * If the associated stream is errored when the lock is released, the reader will appear errored in the same way\n   * from now on; otherwise, the reader will appear closed.\n   *\n   * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by\n   * the reader's {@link ReadableStreamBYOBReader.read | read()} method has not yet been settled. Attempting to\n   * do so will throw a `TypeError` and leave the reader locked to the stream.\n   */\n  releaseLock(): void {\n    if (!IsReadableStreamBYOBReader(this)) {\n      throw byobReaderBrandCheckException('releaseLock');\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return;\n    }\n\n    if (this._readIntoRequests.length > 0) {\n      throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n    }\n\n    ReadableStreamReaderGenericRelease(this);\n  }\n}\n\nObject.defineProperties(ReadableStreamBYOBReader.prototype, {\n  cancel: { enumerable: true },\n  read: { enumerable: true },\n  releaseLock: { enumerable: true },\n  closed: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamBYOBReader.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamBYOBReader',\n    configurable: true\n  });\n}\n\n// Abstract operations for the readers.\n\nexport function IsReadableStreamBYOBReader(x: any): x is ReadableStreamBYOBReader {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readIntoRequests')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamBYOBReader;\n}\n\nexport function ReadableStreamBYOBReaderRead<T extends ArrayBufferView>(\n  reader: ReadableStreamBYOBReader,\n  view: T,\n  readIntoRequest: ReadIntoRequest<T>\n): void {\n  const stream = reader._ownerReadableStream;\n\n  assert(stream !== undefined);\n\n  stream._disturbed = true;\n\n  if (stream._state === 'errored') {\n    readIntoRequest._errorSteps(stream._storedError);\n  } else {\n    ReadableByteStreamControllerPullInto(\n      stream._readableStreamController as ReadableByteStreamController,\n      view,\n      readIntoRequest\n    );\n  }\n}\n\n// Helper functions for the ReadableStreamBYOBReader.\n\nfunction byobReaderBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamBYOBReader.prototype.${name} can only be used on a ReadableStreamBYOBReader`);\n}\n","import { QueuingStrategy, QueuingStrategySizeCallback } from '../queuing-strategy';\nimport NumberIsNaN from '../../stub/number-isnan';\n\nexport function ExtractHighWaterMark(strategy: QueuingStrategy, defaultHWM: number): number {\n  const { highWaterMark } = strategy;\n\n  if (highWaterMark === undefined) {\n    return defaultHWM;\n  }\n\n  if (NumberIsNaN(highWaterMark) || highWaterMark < 0) {\n    throw new RangeError('Invalid highWaterMark');\n  }\n\n  return highWaterMark;\n}\n\nexport function ExtractSizeAlgorithm<T>(strategy: QueuingStrategy<T>): QueuingStrategySizeCallback<T> {\n  const { size } = strategy;\n\n  if (!size) {\n    return () => 1;\n  }\n\n  return size;\n}\n","import { QueuingStrategy, QueuingStrategySizeCallback } from '../queuing-strategy';\nimport { assertDictionary, assertFunction, convertUnrestrictedDouble } from './basic';\n\nexport function convertQueuingStrategy<T>(init: QueuingStrategy<T> | null | undefined,\n                                          context: string): QueuingStrategy<T> {\n  assertDictionary(init, context);\n  const highWaterMark = init?.highWaterMark;\n  const size = init?.size;\n  return {\n    highWaterMark: highWaterMark === undefined ? undefined : convertUnrestrictedDouble(highWaterMark),\n    size: size === undefined ? undefined : convertQueuingStrategySize(size, `${context} has member 'size' that`)\n  };\n}\n\nfunction convertQueuingStrategySize<T>(fn: QueuingStrategySizeCallback<T>,\n                                       context: string): QueuingStrategySizeCallback<T> {\n  assertFunction(fn, context);\n  return chunk => convertUnrestrictedDouble(fn(chunk));\n}\n","import { assertDictionary, assertFunction } from './basic';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\nimport {\n  UnderlyingSink,\n  UnderlyingSinkAbortCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  ValidatedUnderlyingSink\n} from '../writable-stream/underlying-sink';\nimport { WritableStreamDefaultController } from '../writable-stream';\n\nexport function convertUnderlyingSink<W>(original: UnderlyingSink<W> | null,\n                                         context: string): ValidatedUnderlyingSink<W> {\n  assertDictionary(original, context);\n  const abort = original?.abort;\n  const close = original?.close;\n  const start = original?.start;\n  const type = original?.type;\n  const write = original?.write;\n  return {\n    abort: abort === undefined ?\n      undefined :\n      convertUnderlyingSinkAbortCallback(abort, original!, `${context} has member 'abort' that`),\n    close: close === undefined ?\n      undefined :\n      convertUnderlyingSinkCloseCallback(close, original!, `${context} has member 'close' that`),\n    start: start === undefined ?\n      undefined :\n      convertUnderlyingSinkStartCallback(start, original!, `${context} has member 'start' that`),\n    write: write === undefined ?\n      undefined :\n      convertUnderlyingSinkWriteCallback(write, original!, `${context} has member 'write' that`),\n    type\n  };\n}\n\nfunction convertUnderlyingSinkAbortCallback(\n  fn: UnderlyingSinkAbortCallback,\n  original: UnderlyingSink,\n  context: string\n): (reason: any) => Promise<void> {\n  assertFunction(fn, context);\n  return (reason: any) => promiseCall(fn, original, [reason]);\n}\n\nfunction convertUnderlyingSinkCloseCallback(\n  fn: UnderlyingSinkCloseCallback,\n  original: UnderlyingSink,\n  context: string\n): () => Promise<void> {\n  assertFunction(fn, context);\n  return () => promiseCall(fn, original, []);\n}\n\nfunction convertUnderlyingSinkStartCallback(\n  fn: UnderlyingSinkStartCallback,\n  original: UnderlyingSink,\n  context: string\n): UnderlyingSinkStartCallback {\n  assertFunction(fn, context);\n  return (controller: WritableStreamDefaultController) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertUnderlyingSinkWriteCallback<W>(\n  fn: UnderlyingSinkWriteCallback<W>,\n  original: UnderlyingSink<W>,\n  context: string\n): (chunk: W, controller: WritableStreamDefaultController) => Promise<void> {\n  assertFunction(fn, context);\n  return (chunk: W, controller: WritableStreamDefaultController) => promiseCall(fn, original, [chunk, controller]);\n}\n","import { IsWritableStream, WritableStream } from '../writable-stream';\n\nexport function assertWritableStream(x: unknown, context: string): asserts x is WritableStream {\n  if (!IsWritableStream(x)) {\n    throw new TypeError(`${context} is not a WritableStream.`);\n  }\n}\n","/**\n * A signal object that allows you to communicate with a request and abort it if required\n * via its associated `AbortController` object.\n *\n * @remarks\n *   This interface is compatible with the `AbortSignal` interface defined in TypeScript's DOM types.\n *   It is redefined here, so it can be polyfilled without a DOM, for example with\n *   {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.\n *\n * @public\n */\nexport interface AbortSignal {\n  /**\n   * Whether the request is aborted.\n   */\n  readonly aborted: boolean;\n\n  /**\n   * Add an event listener to be triggered when this signal becomes aborted.\n   */\n  addEventListener(type: 'abort', listener: () => void): void;\n\n  /**\n   * Remove an event listener that was previously added with {@link AbortSignal.addEventListener}.\n   */\n  removeEventListener(type: 'abort', listener: () => void): void;\n}\n\nexport function isAbortSignal(value: unknown): value is AbortSignal {\n  if (typeof value !== 'object' || value === null) {\n    return false;\n  }\n  try {\n    return typeof (value as AbortSignal).aborted === 'boolean';\n  } catch {\n    // AbortSignal.prototype.aborted throws if its brand check fails\n    return false;\n  }\n}\n\n/**\n * A controller object that allows you to abort an `AbortSignal` when desired.\n *\n * @remarks\n *   This interface is compatible with the `AbortController` interface defined in TypeScript's DOM types.\n *   It is redefined here, so it can be polyfilled without a DOM, for example with\n *   {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.\n *\n * @internal\n */\nexport interface AbortController {\n  readonly signal: AbortSignal;\n\n  abort(): void;\n}\n\ninterface AbortControllerConstructor {\n  new(): AbortController;\n}\n\nconst supportsAbortController = typeof (AbortController as any) === 'function';\n\n/**\n * Construct a new AbortController, if supported by the platform.\n *\n * @internal\n */\nexport function createAbortController(): AbortController | undefined {\n  if (supportsAbortController) {\n    return new (AbortController as AbortControllerConstructor)();\n  }\n  return undefined;\n}\n","import assert from '../stub/assert';\nimport {\n  newPromise,\n  promiseRejectedWith,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  uponPromise\n} from './helpers/webidl';\nimport {\n  DequeueValue,\n  EnqueueValueWithSize,\n  PeekQueueValue,\n  QueuePair,\n  ResetQueue\n} from './abstract-ops/queue-with-sizes';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { SimpleQueue } from './simple-queue';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { AbortSteps, ErrorSteps } from './abstract-ops/internal-methods';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport {\n  UnderlyingSink,\n  UnderlyingSinkAbortCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  ValidatedUnderlyingSink\n} from './writable-stream/underlying-sink';\nimport { assertObject, assertRequiredArgument } from './validators/basic';\nimport { convertUnderlyingSink } from './validators/underlying-sink';\nimport { assertWritableStream } from './validators/writable-stream';\nimport { AbortController, AbortSignal, createAbortController } from './abort-signal';\n\ntype WritableStreamState = 'writable' | 'closed' | 'erroring' | 'errored';\n\ninterface WriteOrCloseRequest {\n  _resolve: (value?: undefined) => void;\n  _reject: (reason: any) => void;\n}\n\ntype WriteRequest = WriteOrCloseRequest;\ntype CloseRequest = WriteOrCloseRequest;\n\ninterface PendingAbortRequest {\n  _promise: Promise<undefined>;\n  _resolve: (value?: undefined) => void;\n  _reject: (reason: any) => void;\n  _reason: any;\n  _wasAlreadyErroring: boolean;\n}\n\n/**\n * A writable stream represents a destination for data, into which you can write.\n *\n * @public\n */\nclass WritableStream<W = any> {\n  /** @internal */\n  _state!: WritableStreamState;\n  /** @internal */\n  _storedError: any;\n  /** @internal */\n  _writer: WritableStreamDefaultWriter<W> | undefined;\n  /** @internal */\n  _writableStreamController!: WritableStreamDefaultController<W>;\n  /** @internal */\n  _writeRequests!: SimpleQueue<WriteRequest>;\n  /** @internal */\n  _inFlightWriteRequest: WriteRequest | undefined;\n  /** @internal */\n  _closeRequest: CloseRequest | undefined;\n  /** @internal */\n  _inFlightCloseRequest: CloseRequest | undefined;\n  /** @internal */\n  _pendingAbortRequest: PendingAbortRequest | undefined;\n  /** @internal */\n  _backpressure!: boolean;\n\n  constructor(underlyingSink?: UnderlyingSink<W>, strategy?: QueuingStrategy<W>);\n  constructor(rawUnderlyingSink: UnderlyingSink<W> | null | undefined = {},\n              rawStrategy: QueuingStrategy<W> | null | undefined = {}) {\n    if (rawUnderlyingSink === undefined) {\n      rawUnderlyingSink = null;\n    } else {\n      assertObject(rawUnderlyingSink, 'First parameter');\n    }\n\n    const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');\n    const underlyingSink = convertUnderlyingSink(rawUnderlyingSink, 'First parameter');\n\n    InitializeWritableStream(this);\n\n    const type = underlyingSink.type;\n    if (type !== undefined) {\n      throw new RangeError('Invalid type is specified');\n    }\n\n    const sizeAlgorithm = ExtractSizeAlgorithm(strategy);\n    const highWaterMark = ExtractHighWaterMark(strategy, 1);\n\n    SetUpWritableStreamDefaultControllerFromUnderlyingSink(this, underlyingSink, highWaterMark, sizeAlgorithm);\n  }\n\n  /**\n   * Returns whether or not the writable stream is locked to a writer.\n   */\n  get locked(): boolean {\n    if (!IsWritableStream(this)) {\n      throw streamBrandCheckException('locked');\n    }\n\n    return IsWritableStreamLocked(this);\n  }\n\n  /**\n   * Aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be\n   * immediately moved to an errored state, with any queued-up writes discarded. This will also execute any abort\n   * mechanism of the underlying sink.\n   *\n   * The returned promise will fulfill if the stream shuts down successfully, or reject if the underlying sink signaled\n   * that there was an error doing so. Additionally, it will reject with a `TypeError` (without attempting to cancel\n   * the stream) if the stream is currently locked.\n   */\n  abort(reason: any = undefined): Promise<void> {\n    if (!IsWritableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('abort'));\n    }\n\n    if (IsWritableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot abort a stream that already has a writer'));\n    }\n\n    return WritableStreamAbort(this, reason);\n  }\n\n  /**\n   * Closes the stream. The underlying sink will finish processing any previously-written chunks, before invoking its\n   * close behavior. During this time any further attempts to write will fail (without erroring the stream).\n   *\n   * The method returns a promise that will fulfill if all remaining chunks are successfully written and the stream\n   * successfully closes, or rejects if an error is encountered during this process. Additionally, it will reject with\n   * a `TypeError` (without attempting to cancel the stream) if the stream is currently locked.\n   */\n  close() {\n    if (!IsWritableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('close'));\n    }\n\n    if (IsWritableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot close a stream that already has a writer'));\n    }\n\n    if (WritableStreamCloseQueuedOrInFlight(this)) {\n      return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));\n    }\n\n    return WritableStreamClose(this);\n  }\n\n  /**\n   * Creates a {@link WritableStreamDefaultWriter | writer} and locks the stream to the new writer. While the stream\n   * is locked, no other writer can be acquired until this one is released.\n   *\n   * This functionality is especially useful for creating abstractions that desire the ability to write to a stream\n   * without interruption or interleaving. By getting a writer for the stream, you can ensure nobody else can write at\n   * the same time, which would cause the resulting written data to be unpredictable and probably useless.\n   */\n  getWriter(): WritableStreamDefaultWriter<W> {\n    if (!IsWritableStream(this)) {\n      throw streamBrandCheckException('getWriter');\n    }\n\n    return AcquireWritableStreamDefaultWriter(this);\n  }\n}\n\nObject.defineProperties(WritableStream.prototype, {\n  abort: { enumerable: true },\n  close: { enumerable: true },\n  getWriter: { enumerable: true },\n  locked: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStream.prototype, Symbol.toStringTag, {\n    value: 'WritableStream',\n    configurable: true\n  });\n}\n\nexport {\n  AcquireWritableStreamDefaultWriter,\n  CreateWritableStream,\n  IsWritableStream,\n  IsWritableStreamLocked,\n  WritableStream,\n  WritableStreamAbort,\n  WritableStreamDefaultControllerErrorIfNeeded,\n  WritableStreamDefaultWriterCloseWithErrorPropagation,\n  WritableStreamDefaultWriterRelease,\n  WritableStreamDefaultWriterWrite,\n  WritableStreamCloseQueuedOrInFlight,\n  UnderlyingSink,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkAbortCallback\n};\n\n// Abstract operations for the WritableStream.\n\nfunction AcquireWritableStreamDefaultWriter<W>(stream: WritableStream<W>): WritableStreamDefaultWriter<W> {\n  return new WritableStreamDefaultWriter(stream);\n}\n\n// Throws if and only if startAlgorithm throws.\nfunction CreateWritableStream<W>(startAlgorithm: () => void | PromiseLike<void>,\n                                 writeAlgorithm: (chunk: W) => Promise<void>,\n                                 closeAlgorithm: () => Promise<void>,\n                                 abortAlgorithm: (reason: any) => Promise<void>,\n                                 highWaterMark = 1,\n                                 sizeAlgorithm: QueuingStrategySizeCallback<W> = () => 1) {\n  assert(IsNonNegativeNumber(highWaterMark));\n\n  const stream: WritableStream<W> = Object.create(WritableStream.prototype);\n  InitializeWritableStream(stream);\n\n  const controller: WritableStreamDefaultController<W> = Object.create(WritableStreamDefaultController.prototype);\n\n  SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm,\n                                       abortAlgorithm, highWaterMark, sizeAlgorithm);\n  return stream;\n}\n\nfunction InitializeWritableStream<W>(stream: WritableStream<W>) {\n  stream._state = 'writable';\n\n  // The error that will be reported by new method calls once the state becomes errored. Only set when [[state]] is\n  // 'erroring' or 'errored'. May be set to an undefined value.\n  stream._storedError = undefined;\n\n  stream._writer = undefined;\n\n  // Initialize to undefined first because the constructor of the controller checks this\n  // variable to validate the caller.\n  stream._writableStreamController = undefined!;\n\n  // This queue is placed here instead of the writer class in order to allow for passing a writer to the next data\n  // producer without waiting for the queued writes to finish.\n  stream._writeRequests = new SimpleQueue();\n\n  // Write requests are removed from _writeRequests when write() is called on the underlying sink. This prevents\n  // them from being erroneously rejected on error. If a write() call is in-flight, the request is stored here.\n  stream._inFlightWriteRequest = undefined;\n\n  // The promise that was returned from writer.close(). Stored here because it may be fulfilled after the writer\n  // has been detached.\n  stream._closeRequest = undefined;\n\n  // Close request is removed from _closeRequest when close() is called on the underlying sink. This prevents it\n  // from being erroneously rejected on error. If a close() call is in-flight, the request is stored here.\n  stream._inFlightCloseRequest = undefined;\n\n  // The promise that was returned from writer.abort(). This may also be fulfilled after the writer has detached.\n  stream._pendingAbortRequest = undefined;\n\n  // The backpressure signal set by the controller.\n  stream._backpressure = false;\n}\n\nfunction IsWritableStream(x: unknown): x is WritableStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_writableStreamController')) {\n    return false;\n  }\n\n  return x instanceof WritableStream;\n}\n\nfunction IsWritableStreamLocked(stream: WritableStream): boolean {\n  assert(IsWritableStream(stream));\n\n  if (stream._writer === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamAbort(stream: WritableStream, reason: any): Promise<undefined> {\n  if (stream._state === 'closed' || stream._state === 'errored') {\n    return promiseResolvedWith(undefined);\n  }\n  stream._writableStreamController._abortReason = reason;\n  stream._writableStreamController._abortController?.abort();\n\n  // TypeScript narrows the type of `stream._state` down to 'writable' | 'erroring',\n  // but it doesn't know that signaling abort runs author code that might have changed the state.\n  // Widen the type again by casting to WritableStreamState.\n  const state = stream._state as WritableStreamState;\n\n  if (state === 'closed' || state === 'errored') {\n    return promiseResolvedWith(undefined);\n  }\n  if (stream._pendingAbortRequest !== undefined) {\n    return stream._pendingAbortRequest._promise;\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n\n  let wasAlreadyErroring = false;\n  if (state === 'erroring') {\n    wasAlreadyErroring = true;\n    // reason will not be used, so don't keep a reference to it.\n    reason = undefined;\n  }\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    stream._pendingAbortRequest = {\n      _promise: undefined!,\n      _resolve: resolve,\n      _reject: reject,\n      _reason: reason,\n      _wasAlreadyErroring: wasAlreadyErroring\n    };\n  });\n  stream._pendingAbortRequest!._promise = promise;\n\n  if (!wasAlreadyErroring) {\n    WritableStreamStartErroring(stream, reason);\n  }\n\n  return promise;\n}\n\nfunction WritableStreamClose(stream: WritableStream<any>): Promise<undefined> {\n  const state = stream._state;\n  if (state === 'closed' || state === 'errored') {\n    return promiseRejectedWith(new TypeError(\n      `The stream (in ${state} state) is not in the writable state and cannot be closed`));\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n  assert(!WritableStreamCloseQueuedOrInFlight(stream));\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    const closeRequest: CloseRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._closeRequest = closeRequest;\n  });\n\n  const writer = stream._writer;\n  if (writer !== undefined && stream._backpressure && state === 'writable') {\n    defaultWriterReadyPromiseResolve(writer);\n  }\n\n  WritableStreamDefaultControllerClose(stream._writableStreamController);\n\n  return promise;\n}\n\n// WritableStream API exposed for controllers.\n\nfunction WritableStreamAddWriteRequest(stream: WritableStream): Promise<undefined> {\n  assert(IsWritableStreamLocked(stream));\n  assert(stream._state === 'writable');\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    const writeRequest: WriteRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._writeRequests.push(writeRequest);\n  });\n\n  return promise;\n}\n\nfunction WritableStreamDealWithRejection(stream: WritableStream, error: any) {\n  const state = stream._state;\n\n  if (state === 'writable') {\n    WritableStreamStartErroring(stream, error);\n    return;\n  }\n\n  assert(state === 'erroring');\n  WritableStreamFinishErroring(stream);\n}\n\nfunction WritableStreamStartErroring(stream: WritableStream, reason: any) {\n  assert(stream._storedError === undefined);\n  assert(stream._state === 'writable');\n\n  const controller = stream._writableStreamController;\n  assert(controller !== undefined);\n\n  stream._state = 'erroring';\n  stream._storedError = reason;\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);\n  }\n\n  if (!WritableStreamHasOperationMarkedInFlight(stream) && controller._started) {\n    WritableStreamFinishErroring(stream);\n  }\n}\n\nfunction WritableStreamFinishErroring(stream: WritableStream) {\n  assert(stream._state === 'erroring');\n  assert(!WritableStreamHasOperationMarkedInFlight(stream));\n  stream._state = 'errored';\n  stream._writableStreamController[ErrorSteps]();\n\n  const storedError = stream._storedError;\n  stream._writeRequests.forEach(writeRequest => {\n    writeRequest._reject(storedError);\n  });\n  stream._writeRequests = new SimpleQueue();\n\n  if (stream._pendingAbortRequest === undefined) {\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    return;\n  }\n\n  const abortRequest = stream._pendingAbortRequest;\n  stream._pendingAbortRequest = undefined;\n\n  if (abortRequest._wasAlreadyErroring) {\n    abortRequest._reject(storedError);\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    return;\n  }\n\n  const promise = stream._writableStreamController[AbortSteps](abortRequest._reason);\n  uponPromise(\n    promise,\n    () => {\n      abortRequest._resolve();\n      WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    },\n    (reason: any) => {\n      abortRequest._reject(reason);\n      WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    });\n}\n\nfunction WritableStreamFinishInFlightWrite(stream: WritableStream) {\n  assert(stream._inFlightWriteRequest !== undefined);\n  stream._inFlightWriteRequest!._resolve(undefined);\n  stream._inFlightWriteRequest = undefined;\n}\n\nfunction WritableStreamFinishInFlightWriteWithError(stream: WritableStream, error: any) {\n  assert(stream._inFlightWriteRequest !== undefined);\n  stream._inFlightWriteRequest!._reject(error);\n  stream._inFlightWriteRequest = undefined;\n\n  assert(stream._state === 'writable' || stream._state === 'erroring');\n\n  WritableStreamDealWithRejection(stream, error);\n}\n\nfunction WritableStreamFinishInFlightClose(stream: WritableStream) {\n  assert(stream._inFlightCloseRequest !== undefined);\n  stream._inFlightCloseRequest!._resolve(undefined);\n  stream._inFlightCloseRequest = undefined;\n\n  const state = stream._state;\n\n  assert(state === 'writable' || state === 'erroring');\n\n  if (state === 'erroring') {\n    // The error was too late to do anything, so it is ignored.\n    stream._storedError = undefined;\n    if (stream._pendingAbortRequest !== undefined) {\n      stream._pendingAbortRequest._resolve();\n      stream._pendingAbortRequest = undefined;\n    }\n  }\n\n  stream._state = 'closed';\n\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    defaultWriterClosedPromiseResolve(writer);\n  }\n\n  assert(stream._pendingAbortRequest === undefined);\n  assert(stream._storedError === undefined);\n}\n\nfunction WritableStreamFinishInFlightCloseWithError(stream: WritableStream, error: any) {\n  assert(stream._inFlightCloseRequest !== undefined);\n  stream._inFlightCloseRequest!._reject(error);\n  stream._inFlightCloseRequest = undefined;\n\n  assert(stream._state === 'writable' || stream._state === 'erroring');\n\n  // Never execute sink abort() after sink close().\n  if (stream._pendingAbortRequest !== undefined) {\n    stream._pendingAbortRequest._reject(error);\n    stream._pendingAbortRequest = undefined;\n  }\n  WritableStreamDealWithRejection(stream, error);\n}\n\n// TODO(ricea): Fix alphabetical order.\nfunction WritableStreamCloseQueuedOrInFlight(stream: WritableStream): boolean {\n  if (stream._closeRequest === undefined && stream._inFlightCloseRequest === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamHasOperationMarkedInFlight(stream: WritableStream): boolean {\n  if (stream._inFlightWriteRequest === undefined && stream._inFlightCloseRequest === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamMarkCloseRequestInFlight(stream: WritableStream) {\n  assert(stream._inFlightCloseRequest === undefined);\n  assert(stream._closeRequest !== undefined);\n  stream._inFlightCloseRequest = stream._closeRequest;\n  stream._closeRequest = undefined;\n}\n\nfunction WritableStreamMarkFirstWriteRequestInFlight(stream: WritableStream) {\n  assert(stream._inFlightWriteRequest === undefined);\n  assert(stream._writeRequests.length !== 0);\n  stream._inFlightWriteRequest = stream._writeRequests.shift();\n}\n\nfunction WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream: WritableStream) {\n  assert(stream._state === 'errored');\n  if (stream._closeRequest !== undefined) {\n    assert(stream._inFlightCloseRequest === undefined);\n\n    stream._closeRequest._reject(stream._storedError);\n    stream._closeRequest = undefined;\n  }\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    defaultWriterClosedPromiseReject(writer, stream._storedError);\n  }\n}\n\nfunction WritableStreamUpdateBackpressure(stream: WritableStream, backpressure: boolean) {\n  assert(stream._state === 'writable');\n  assert(!WritableStreamCloseQueuedOrInFlight(stream));\n\n  const writer = stream._writer;\n  if (writer !== undefined && backpressure !== stream._backpressure) {\n    if (backpressure) {\n      defaultWriterReadyPromiseReset(writer);\n    } else {\n      assert(!backpressure);\n\n      defaultWriterReadyPromiseResolve(writer);\n    }\n  }\n\n  stream._backpressure = backpressure;\n}\n\n/**\n * A default writer vended by a {@link WritableStream}.\n *\n * @public\n */\nexport class WritableStreamDefaultWriter<W = any> {\n  /** @internal */\n  _ownerWritableStream: WritableStream<W>;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _closedPromiseState!: 'pending' | 'resolved' | 'rejected';\n  /** @internal */\n  _readyPromise!: Promise<undefined>;\n  /** @internal */\n  _readyPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _readyPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readyPromiseState!: 'pending' | 'fulfilled' | 'rejected';\n\n  constructor(stream: WritableStream<W>) {\n    assertRequiredArgument(stream, 1, 'WritableStreamDefaultWriter');\n    assertWritableStream(stream, 'First parameter');\n\n    if (IsWritableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive writing by another writer');\n    }\n\n    this._ownerWritableStream = stream;\n    stream._writer = this;\n\n    const state = stream._state;\n\n    if (state === 'writable') {\n      if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._backpressure) {\n        defaultWriterReadyPromiseInitialize(this);\n      } else {\n        defaultWriterReadyPromiseInitializeAsResolved(this);\n      }\n\n      defaultWriterClosedPromiseInitialize(this);\n    } else if (state === 'erroring') {\n      defaultWriterReadyPromiseInitializeAsRejected(this, stream._storedError);\n      defaultWriterClosedPromiseInitialize(this);\n    } else if (state === 'closed') {\n      defaultWriterReadyPromiseInitializeAsResolved(this);\n      defaultWriterClosedPromiseInitializeAsResolved(this);\n    } else {\n      assert(state === 'errored');\n\n      const storedError = stream._storedError;\n      defaultWriterReadyPromiseInitializeAsRejected(this, storedError);\n      defaultWriterClosedPromiseInitializeAsRejected(this, storedError);\n    }\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or\n   * the writer’s lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * Returns the desired size to fill the stream’s internal queue. It can be negative, if the queue is over-full.\n   * A producer can use this information to determine the right amount of data to write.\n   *\n   * It will be `null` if the stream cannot be successfully written to (due to either being errored, or having an abort\n   * queued up). It will return zero if the stream is closed. And the getter will throw an exception if invoked when\n   * the writer’s lock is released.\n   */\n  get desiredSize(): number | null {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      throw defaultWriterBrandCheckException('desiredSize');\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      throw defaultWriterLockException('desiredSize');\n    }\n\n    return WritableStreamDefaultWriterGetDesiredSize(this);\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the desired size to fill the stream’s internal queue transitions\n   * from non-positive to positive, signaling that it is no longer applying backpressure. Once the desired size dips\n   * back to zero or below, the getter will return a new promise that stays pending until the next transition.\n   *\n   * If the stream becomes errored or aborted, or the writer’s lock is released, the returned promise will become\n   * rejected.\n   */\n  get ready(): Promise<undefined> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('ready'));\n    }\n\n    return this._readyPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link WritableStream.abort | stream.abort(reason)}.\n   */\n  abort(reason: any = undefined): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('abort'));\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('abort'));\n    }\n\n    return WritableStreamDefaultWriterAbort(this, reason);\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link WritableStream.close | stream.close()}.\n   */\n  close(): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('close'));\n    }\n\n    const stream = this._ownerWritableStream;\n\n    if (stream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('close'));\n    }\n\n    if (WritableStreamCloseQueuedOrInFlight(stream)) {\n      return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));\n    }\n\n    return WritableStreamDefaultWriterClose(this);\n  }\n\n  /**\n   * Releases the writer’s lock on the corresponding stream. After the lock is released, the writer is no longer active.\n   * If the associated stream is errored when the lock is released, the writer will appear errored in the same way from\n   * now on; otherwise, the writer will appear closed.\n   *\n   * Note that the lock can still be released even if some ongoing writes have not yet finished (i.e. even if the\n   * promises returned from previous calls to {@link WritableStreamDefaultWriter.write | write()} have not yet settled).\n   * It’s not necessary to hold the lock on the writer for the duration of the write; the lock instead simply prevents\n   * other producers from writing in an interleaved manner.\n   */\n  releaseLock(): void {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      throw defaultWriterBrandCheckException('releaseLock');\n    }\n\n    const stream = this._ownerWritableStream;\n\n    if (stream === undefined) {\n      return;\n    }\n\n    assert(stream._writer !== undefined);\n\n    WritableStreamDefaultWriterRelease(this);\n  }\n\n  /**\n   * Writes the given chunk to the writable stream, by waiting until any previous writes have finished successfully,\n   * and then sending the chunk to the underlying sink's {@link UnderlyingSink.write | write()} method. It will return\n   * a promise that fulfills with undefined upon a successful write, or rejects if the write fails or stream becomes\n   * errored before the writing process is initiated.\n   *\n   * Note that what \"success\" means is up to the underlying sink; it might indicate simply that the chunk has been\n   * accepted, and not necessarily that it is safely saved to its ultimate destination.\n   */\n  write(chunk: W): Promise<void>;\n  write(chunk: W = undefined!): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('write'));\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('write to'));\n    }\n\n    return WritableStreamDefaultWriterWrite(this, chunk);\n  }\n}\n\nObject.defineProperties(WritableStreamDefaultWriter.prototype, {\n  abort: { enumerable: true },\n  close: { enumerable: true },\n  releaseLock: { enumerable: true },\n  write: { enumerable: true },\n  closed: { enumerable: true },\n  desiredSize: { enumerable: true },\n  ready: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStreamDefaultWriter.prototype, Symbol.toStringTag, {\n    value: 'WritableStreamDefaultWriter',\n    configurable: true\n  });\n}\n\n// Abstract operations for the WritableStreamDefaultWriter.\n\nfunction IsWritableStreamDefaultWriter<W = any>(x: any): x is WritableStreamDefaultWriter<W> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) {\n    return false;\n  }\n\n  return x instanceof WritableStreamDefaultWriter;\n}\n\n// A client of WritableStreamDefaultWriter may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultWriterAbort(writer: WritableStreamDefaultWriter, reason: any) {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  return WritableStreamAbort(stream, reason);\n}\n\nfunction WritableStreamDefaultWriterClose(writer: WritableStreamDefaultWriter): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  return WritableStreamClose(stream);\n}\n\nfunction WritableStreamDefaultWriterCloseWithErrorPropagation(writer: WritableStreamDefaultWriter): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  const state = stream._state;\n  if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {\n    return promiseResolvedWith(undefined);\n  }\n\n  if (state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n\n  return WritableStreamDefaultWriterClose(writer);\n}\n\nfunction WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer: WritableStreamDefaultWriter, error: any) {\n  if (writer._closedPromiseState === 'pending') {\n    defaultWriterClosedPromiseReject(writer, error);\n  } else {\n    defaultWriterClosedPromiseResetToRejected(writer, error);\n  }\n}\n\nfunction WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer: WritableStreamDefaultWriter, error: any) {\n  if (writer._readyPromiseState === 'pending') {\n    defaultWriterReadyPromiseReject(writer, error);\n  } else {\n    defaultWriterReadyPromiseResetToRejected(writer, error);\n  }\n}\n\nfunction WritableStreamDefaultWriterGetDesiredSize(writer: WritableStreamDefaultWriter): number | null {\n  const stream = writer._ownerWritableStream;\n  const state = stream._state;\n\n  if (state === 'errored' || state === 'erroring') {\n    return null;\n  }\n\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return WritableStreamDefaultControllerGetDesiredSize(stream._writableStreamController);\n}\n\nfunction WritableStreamDefaultWriterRelease(writer: WritableStreamDefaultWriter) {\n  const stream = writer._ownerWritableStream;\n  assert(stream !== undefined);\n  assert(stream._writer === writer);\n\n  const releasedError = new TypeError(\n    `Writer was released and can no longer be used to monitor the stream's closedness`);\n\n  WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, releasedError);\n\n  // The state transitions to \"errored\" before the sink abort() method runs, but the writer.closed promise is not\n  // rejected until afterwards. This means that simply testing state will not work.\n  WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, releasedError);\n\n  stream._writer = undefined;\n  writer._ownerWritableStream = undefined!;\n}\n\nfunction WritableStreamDefaultWriterWrite<W>(writer: WritableStreamDefaultWriter<W>, chunk: W): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  const controller = stream._writableStreamController;\n\n  const chunkSize = WritableStreamDefaultControllerGetChunkSize(controller, chunk);\n\n  if (stream !== writer._ownerWritableStream) {\n    return promiseRejectedWith(defaultWriterLockException('write to'));\n  }\n\n  const state = stream._state;\n  if (state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n  if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {\n    return promiseRejectedWith(new TypeError('The stream is closing or closed and cannot be written to'));\n  }\n  if (state === 'erroring') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  assert(state === 'writable');\n\n  const promise = WritableStreamAddWriteRequest(stream);\n\n  WritableStreamDefaultControllerWrite(controller, chunk, chunkSize);\n\n  return promise;\n}\n\nconst closeSentinel: unique symbol = {} as any;\n\ntype QueueRecord<W> = W | typeof closeSentinel;\n\n/**\n * Allows control of a {@link WritableStream | writable stream}'s state and internal queue.\n *\n * @public\n */\nexport class WritableStreamDefaultController<W = any> {\n  /** @internal */\n  _controlledWritableStream!: WritableStream<W>;\n  /** @internal */\n  _queue!: SimpleQueue<QueuePair<QueueRecord<W>>>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _abortReason: any;\n  /** @internal */\n  _abortController: AbortController | undefined;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _strategySizeAlgorithm!: QueuingStrategySizeCallback<W>;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _writeAlgorithm!: (chunk: W) => Promise<void>;\n  /** @internal */\n  _closeAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _abortAlgorithm!: (reason: any) => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * The reason which was passed to `WritableStream.abort(reason)` when the stream was aborted.\n   *\n   * @deprecated\n   *  This property has been removed from the specification, see https://github.com/whatwg/streams/pull/1177.\n   *  Use {@link WritableStreamDefaultController.signal}'s `reason` instead.\n   */\n  get abortReason(): any {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('abortReason');\n    }\n    return this._abortReason;\n  }\n\n  /**\n   * An `AbortSignal` that can be used to abort the pending write or close operation when the stream is aborted.\n   */\n  get signal(): AbortSignal {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('signal');\n    }\n    if (this._abortController === undefined) {\n      // Older browsers or older Node versions may not support `AbortController` or `AbortSignal`.\n      // We don't want to bundle and ship an `AbortController` polyfill together with our polyfill,\n      // so instead we only implement support for `signal` if we find a global `AbortController` constructor.\n      throw new TypeError('WritableStreamDefaultController.prototype.signal is not supported');\n    }\n    return this._abortController.signal;\n  }\n\n  /**\n   * Closes the controlled writable stream, making all future interactions with it fail with the given error `e`.\n   *\n   * This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying\n   * sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the\n   * normal lifecycle of interactions with the underlying sink.\n   */\n  error(e: any = undefined): void {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n    const state = this._controlledWritableStream._state;\n    if (state !== 'writable') {\n      // The stream is closed, errored or will be soon. The sink can't do anything useful if it gets an error here, so\n      // just treat it as a no-op.\n      return;\n    }\n\n    WritableStreamDefaultControllerError(this, e);\n  }\n\n  /** @internal */\n  [AbortSteps](reason: any): Promise<void> {\n    const result = this._abortAlgorithm(reason);\n    WritableStreamDefaultControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [ErrorSteps]() {\n    ResetQueue(this);\n  }\n}\n\nObject.defineProperties(WritableStreamDefaultController.prototype, {\n  abortReason: { enumerable: true },\n  signal: { enumerable: true },\n  error: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'WritableStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Abstract operations implementing interface required by the WritableStream.\n\nfunction IsWritableStreamDefaultController(x: any): x is WritableStreamDefaultController<any> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledWritableStream')) {\n    return false;\n  }\n\n  return x instanceof WritableStreamDefaultController;\n}\n\nfunction SetUpWritableStreamDefaultController<W>(stream: WritableStream<W>,\n                                                 controller: WritableStreamDefaultController<W>,\n                                                 startAlgorithm: () => void | PromiseLike<void>,\n                                                 writeAlgorithm: (chunk: W) => Promise<void>,\n                                                 closeAlgorithm: () => Promise<void>,\n                                                 abortAlgorithm: (reason: any) => Promise<void>,\n                                                 highWaterMark: number,\n                                                 sizeAlgorithm: QueuingStrategySizeCallback<W>) {\n  assert(IsWritableStream(stream));\n  assert(stream._writableStreamController === undefined);\n\n  controller._controlledWritableStream = stream;\n  stream._writableStreamController = controller;\n\n  // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n  controller._queue = undefined!;\n  controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._abortReason = undefined;\n  controller._abortController = createAbortController();\n  controller._started = false;\n\n  controller._strategySizeAlgorithm = sizeAlgorithm;\n  controller._strategyHWM = highWaterMark;\n\n  controller._writeAlgorithm = writeAlgorithm;\n  controller._closeAlgorithm = closeAlgorithm;\n  controller._abortAlgorithm = abortAlgorithm;\n\n  const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n  WritableStreamUpdateBackpressure(stream, backpressure);\n\n  const startResult = startAlgorithm();\n  const startPromise = promiseResolvedWith(startResult);\n  uponPromise(\n    startPromise,\n    () => {\n      assert(stream._state === 'writable' || stream._state === 'erroring');\n      controller._started = true;\n      WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n    },\n    r => {\n      assert(stream._state === 'writable' || stream._state === 'erroring');\n      controller._started = true;\n      WritableStreamDealWithRejection(stream, r);\n    }\n  );\n}\n\nfunction SetUpWritableStreamDefaultControllerFromUnderlyingSink<W>(stream: WritableStream<W>,\n                                                                   underlyingSink: ValidatedUnderlyingSink<W>,\n                                                                   highWaterMark: number,\n                                                                   sizeAlgorithm: QueuingStrategySizeCallback<W>) {\n  const controller = Object.create(WritableStreamDefaultController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let writeAlgorithm: (chunk: W) => Promise<void> = () => promiseResolvedWith(undefined);\n  let closeAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let abortAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingSink.start !== undefined) {\n    startAlgorithm = () => underlyingSink.start!(controller);\n  }\n  if (underlyingSink.write !== undefined) {\n    writeAlgorithm = chunk => underlyingSink.write!(chunk, controller);\n  }\n  if (underlyingSink.close !== undefined) {\n    closeAlgorithm = () => underlyingSink.close!();\n  }\n  if (underlyingSink.abort !== undefined) {\n    abortAlgorithm = reason => underlyingSink.abort!(reason);\n  }\n\n  SetUpWritableStreamDefaultController(\n    stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm\n  );\n}\n\n// ClearAlgorithms may be called twice. Erroring the same stream in multiple ways will often result in redundant calls.\nfunction WritableStreamDefaultControllerClearAlgorithms(controller: WritableStreamDefaultController<any>) {\n  controller._writeAlgorithm = undefined!;\n  controller._closeAlgorithm = undefined!;\n  controller._abortAlgorithm = undefined!;\n  controller._strategySizeAlgorithm = undefined!;\n}\n\nfunction WritableStreamDefaultControllerClose<W>(controller: WritableStreamDefaultController<W>) {\n  EnqueueValueWithSize(controller, closeSentinel, 0);\n  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\nfunction WritableStreamDefaultControllerGetChunkSize<W>(controller: WritableStreamDefaultController<W>,\n                                                        chunk: W): number {\n  try {\n    return controller._strategySizeAlgorithm(chunk);\n  } catch (chunkSizeE) {\n    WritableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE);\n    return 1;\n  }\n}\n\nfunction WritableStreamDefaultControllerGetDesiredSize(controller: WritableStreamDefaultController<any>): number {\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\nfunction WritableStreamDefaultControllerWrite<W>(controller: WritableStreamDefaultController<W>,\n                                                 chunk: W,\n                                                 chunkSize: number) {\n  try {\n    EnqueueValueWithSize(controller, chunk, chunkSize);\n  } catch (enqueueE) {\n    WritableStreamDefaultControllerErrorIfNeeded(controller, enqueueE);\n    return;\n  }\n\n  const stream = controller._controlledWritableStream;\n  if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._state === 'writable') {\n    const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n    WritableStreamUpdateBackpressure(stream, backpressure);\n  }\n\n  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\n// Abstract operations for the WritableStreamDefaultController.\n\nfunction WritableStreamDefaultControllerAdvanceQueueIfNeeded<W>(controller: WritableStreamDefaultController<W>) {\n  const stream = controller._controlledWritableStream;\n\n  if (!controller._started) {\n    return;\n  }\n\n  if (stream._inFlightWriteRequest !== undefined) {\n    return;\n  }\n\n  const state = stream._state;\n  assert(state !== 'closed' && state !== 'errored');\n  if (state === 'erroring') {\n    WritableStreamFinishErroring(stream);\n    return;\n  }\n\n  if (controller._queue.length === 0) {\n    return;\n  }\n\n  const value = PeekQueueValue(controller);\n  if (value === closeSentinel) {\n    WritableStreamDefaultControllerProcessClose(controller);\n  } else {\n    WritableStreamDefaultControllerProcessWrite(controller, value);\n  }\n}\n\nfunction WritableStreamDefaultControllerErrorIfNeeded(controller: WritableStreamDefaultController<any>, error: any) {\n  if (controller._controlledWritableStream._state === 'writable') {\n    WritableStreamDefaultControllerError(controller, error);\n  }\n}\n\nfunction WritableStreamDefaultControllerProcessClose(controller: WritableStreamDefaultController<any>) {\n  const stream = controller._controlledWritableStream;\n\n  WritableStreamMarkCloseRequestInFlight(stream);\n\n  DequeueValue(controller);\n  assert(controller._queue.length === 0);\n\n  const sinkClosePromise = controller._closeAlgorithm();\n  WritableStreamDefaultControllerClearAlgorithms(controller);\n  uponPromise(\n    sinkClosePromise,\n    () => {\n      WritableStreamFinishInFlightClose(stream);\n    },\n    reason => {\n      WritableStreamFinishInFlightCloseWithError(stream, reason);\n    }\n  );\n}\n\nfunction WritableStreamDefaultControllerProcessWrite<W>(controller: WritableStreamDefaultController<W>, chunk: W) {\n  const stream = controller._controlledWritableStream;\n\n  WritableStreamMarkFirstWriteRequestInFlight(stream);\n\n  const sinkWritePromise = controller._writeAlgorithm(chunk);\n  uponPromise(\n    sinkWritePromise,\n    () => {\n      WritableStreamFinishInFlightWrite(stream);\n\n      const state = stream._state;\n      assert(state === 'writable' || state === 'erroring');\n\n      DequeueValue(controller);\n\n      if (!WritableStreamCloseQueuedOrInFlight(stream) && state === 'writable') {\n        const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n        WritableStreamUpdateBackpressure(stream, backpressure);\n      }\n\n      WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n    },\n    reason => {\n      if (stream._state === 'writable') {\n        WritableStreamDefaultControllerClearAlgorithms(controller);\n      }\n      WritableStreamFinishInFlightWriteWithError(stream, reason);\n    }\n  );\n}\n\nfunction WritableStreamDefaultControllerGetBackpressure(controller: WritableStreamDefaultController<any>): boolean {\n  const desiredSize = WritableStreamDefaultControllerGetDesiredSize(controller);\n  return desiredSize <= 0;\n}\n\n// A client of WritableStreamDefaultController may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultControllerError(controller: WritableStreamDefaultController<any>, error: any) {\n  const stream = controller._controlledWritableStream;\n\n  assert(stream._state === 'writable');\n\n  WritableStreamDefaultControllerClearAlgorithms(controller);\n  WritableStreamStartErroring(stream, error);\n}\n\n// Helper functions for the WritableStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(`WritableStream.prototype.${name} can only be used on a WritableStream`);\n}\n\n// Helper functions for the WritableStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `WritableStreamDefaultController.prototype.${name} can only be used on a WritableStreamDefaultController`);\n}\n\n\n// Helper functions for the WritableStreamDefaultWriter.\n\nfunction defaultWriterBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `WritableStreamDefaultWriter.prototype.${name} can only be used on a WritableStreamDefaultWriter`);\n}\n\nfunction defaultWriterLockException(name: string): TypeError {\n  return new TypeError('Cannot ' + name + ' a stream using a released writer');\n}\n\nfunction defaultWriterClosedPromiseInitialize(writer: WritableStreamDefaultWriter) {\n  writer._closedPromise = newPromise((resolve, reject) => {\n    writer._closedPromise_resolve = resolve;\n    writer._closedPromise_reject = reject;\n    writer._closedPromiseState = 'pending';\n  });\n}\n\nfunction defaultWriterClosedPromiseInitializeAsRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  defaultWriterClosedPromiseInitialize(writer);\n  defaultWriterClosedPromiseReject(writer, reason);\n}\n\nfunction defaultWriterClosedPromiseInitializeAsResolved(writer: WritableStreamDefaultWriter) {\n  defaultWriterClosedPromiseInitialize(writer);\n  defaultWriterClosedPromiseResolve(writer);\n}\n\nfunction defaultWriterClosedPromiseReject(writer: WritableStreamDefaultWriter, reason: any) {\n  if (writer._closedPromise_reject === undefined) {\n    return;\n  }\n  assert(writer._closedPromiseState === 'pending');\n\n  setPromiseIsHandledToTrue(writer._closedPromise);\n  writer._closedPromise_reject(reason);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'rejected';\n}\n\nfunction defaultWriterClosedPromiseResetToRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  assert(writer._closedPromise_resolve === undefined);\n  assert(writer._closedPromise_reject === undefined);\n  assert(writer._closedPromiseState !== 'pending');\n\n  defaultWriterClosedPromiseInitializeAsRejected(writer, reason);\n}\n\nfunction defaultWriterClosedPromiseResolve(writer: WritableStreamDefaultWriter) {\n  if (writer._closedPromise_resolve === undefined) {\n    return;\n  }\n  assert(writer._closedPromiseState === 'pending');\n\n  writer._closedPromise_resolve(undefined);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'resolved';\n}\n\nfunction defaultWriterReadyPromiseInitialize(writer: WritableStreamDefaultWriter) {\n  writer._readyPromise = newPromise((resolve, reject) => {\n    writer._readyPromise_resolve = resolve;\n    writer._readyPromise_reject = reject;\n  });\n  writer._readyPromiseState = 'pending';\n}\n\nfunction defaultWriterReadyPromiseInitializeAsRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  defaultWriterReadyPromiseInitialize(writer);\n  defaultWriterReadyPromiseReject(writer, reason);\n}\n\nfunction defaultWriterReadyPromiseInitializeAsResolved(writer: WritableStreamDefaultWriter) {\n  defaultWriterReadyPromiseInitialize(writer);\n  defaultWriterReadyPromiseResolve(writer);\n}\n\nfunction defaultWriterReadyPromiseReject(writer: WritableStreamDefaultWriter, reason: any) {\n  if (writer._readyPromise_reject === undefined) {\n    return;\n  }\n\n  setPromiseIsHandledToTrue(writer._readyPromise);\n  writer._readyPromise_reject(reason);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'rejected';\n}\n\nfunction defaultWriterReadyPromiseReset(writer: WritableStreamDefaultWriter) {\n  assert(writer._readyPromise_resolve === undefined);\n  assert(writer._readyPromise_reject === undefined);\n\n  defaultWriterReadyPromiseInitialize(writer);\n}\n\nfunction defaultWriterReadyPromiseResetToRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  assert(writer._readyPromise_resolve === undefined);\n  assert(writer._readyPromise_reject === undefined);\n\n  defaultWriterReadyPromiseInitializeAsRejected(writer, reason);\n}\n\nfunction defaultWriterReadyPromiseResolve(writer: WritableStreamDefaultWriter) {\n  if (writer._readyPromise_resolve === undefined) {\n    return;\n  }\n\n  writer._readyPromise_resolve(undefined);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'fulfilled';\n}\n","/// <reference lib=\"dom\" />\nexport const NativeDOMException: typeof DOMException | undefined =\n  typeof DOMException !== 'undefined' ? DOMException : undefined;\n","/// <reference types=\"node\" />\nimport { NativeDOMException } from './native';\n\ndeclare class DOMExceptionClass extends Error {\n  constructor(message?: string, name?: string);\n\n  name: string;\n  message: string;\n}\n\ntype DOMException = DOMExceptionClass;\ntype DOMExceptionConstructor = typeof DOMExceptionClass;\n\nfunction isDOMExceptionConstructor(ctor: unknown): ctor is DOMExceptionConstructor {\n  if (!(typeof ctor === 'function' || typeof ctor === 'object')) {\n    return false;\n  }\n  try {\n    new (ctor as DOMExceptionConstructor)();\n    return true;\n  } catch {\n    return false;\n  }\n}\n\nfunction createDOMExceptionPolyfill(): DOMExceptionConstructor {\n  // eslint-disable-next-line no-shadow\n  const ctor = function DOMException(this: DOMException, message?: string, name?: string) {\n    this.message = message || '';\n    this.name = name || 'Error';\n    if (Error.captureStackTrace) {\n      Error.captureStackTrace(this, this.constructor);\n    }\n  } as any;\n  ctor.prototype = Object.create(Error.prototype);\n  Object.defineProperty(ctor.prototype, 'constructor', { value: ctor, writable: true, configurable: true });\n  return ctor;\n}\n\n// eslint-disable-next-line no-redeclare\nconst DOMException: DOMExceptionConstructor =\n  isDOMExceptionConstructor(NativeDOMException) ? NativeDOMException : createDOMExceptionPolyfill();\n\nexport { DOMException };\n","import { IsReadableStream, IsReadableStreamLocked, ReadableStream, ReadableStreamCancel } from '../readable-stream';\nimport { AcquireReadableStreamDefaultReader, ReadableStreamDefaultReaderRead } from './default-reader';\nimport { ReadableStreamReaderGenericRelease } from './generic-reader';\nimport {\n  AcquireWritableStreamDefaultWriter,\n  IsWritableStream,\n  IsWritableStreamLocked,\n  WritableStream,\n  WritableStreamAbort,\n  WritableStreamCloseQueuedOrInFlight,\n  WritableStreamDefaultWriterCloseWithErrorPropagation,\n  WritableStreamDefaultWriterRelease,\n  WritableStreamDefaultWriterWrite\n} from '../writable-stream';\nimport assert from '../../stub/assert';\nimport {\n  newPromise,\n  PerformPromiseThen,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  uponFulfillment,\n  uponPromise,\n  uponRejection\n} from '../helpers/webidl';\nimport { noop } from '../../utils';\nimport { AbortSignal, isAbortSignal } from '../abort-signal';\nimport { DOMException } from '../../stub/dom-exception';\n\nexport function ReadableStreamPipeTo<T>(source: ReadableStream<T>,\n                                        dest: WritableStream<T>,\n                                        preventClose: boolean,\n                                        preventAbort: boolean,\n                                        preventCancel: boolean,\n                                        signal: AbortSignal | undefined): Promise<undefined> {\n  assert(IsReadableStream(source));\n  assert(IsWritableStream(dest));\n  assert(typeof preventClose === 'boolean');\n  assert(typeof preventAbort === 'boolean');\n  assert(typeof preventCancel === 'boolean');\n  assert(signal === undefined || isAbortSignal(signal));\n  assert(!IsReadableStreamLocked(source));\n  assert(!IsWritableStreamLocked(dest));\n\n  const reader = AcquireReadableStreamDefaultReader<T>(source);\n  const writer = AcquireWritableStreamDefaultWriter<T>(dest);\n\n  source._disturbed = true;\n\n  let shuttingDown = false;\n\n  // This is used to keep track of the spec's requirement that we wait for ongoing writes during shutdown.\n  let currentWrite = promiseResolvedWith<void>(undefined);\n\n  return newPromise((resolve, reject) => {\n    let abortAlgorithm: () => void;\n    if (signal !== undefined) {\n      abortAlgorithm = () => {\n        const error = new DOMException('Aborted', 'AbortError');\n        const actions: Array<() => Promise<void>> = [];\n        if (!preventAbort) {\n          actions.push(() => {\n            if (dest._state === 'writable') {\n              return WritableStreamAbort(dest, error);\n            }\n            return promiseResolvedWith(undefined);\n          });\n        }\n        if (!preventCancel) {\n          actions.push(() => {\n            if (source._state === 'readable') {\n              return ReadableStreamCancel(source, error);\n            }\n            return promiseResolvedWith(undefined);\n          });\n        }\n        shutdownWithAction(() => Promise.all(actions.map(action => action())), true, error);\n      };\n\n      if (signal.aborted) {\n        abortAlgorithm();\n        return;\n      }\n\n      signal.addEventListener('abort', abortAlgorithm);\n    }\n\n    // Using reader and writer, read all chunks from this and write them to dest\n    // - Backpressure must be enforced\n    // - Shutdown must stop all activity\n    function pipeLoop() {\n      return newPromise<void>((resolveLoop, rejectLoop) => {\n        function next(done: boolean) {\n          if (done) {\n            resolveLoop();\n          } else {\n            // Use `PerformPromiseThen` instead of `uponPromise` to avoid\n            // adding unnecessary `.catch(rethrowAssertionErrorRejection)` handlers\n            PerformPromiseThen(pipeStep(), next, rejectLoop);\n          }\n        }\n\n        next(false);\n      });\n    }\n\n    function pipeStep(): Promise<boolean> {\n      if (shuttingDown) {\n        return promiseResolvedWith(true);\n      }\n\n      return PerformPromiseThen(writer._readyPromise, () => {\n        return newPromise<boolean>((resolveRead, rejectRead) => {\n          ReadableStreamDefaultReaderRead(\n            reader,\n            {\n              _chunkSteps: chunk => {\n                currentWrite = PerformPromiseThen(WritableStreamDefaultWriterWrite(writer, chunk), undefined, noop);\n                resolveRead(false);\n              },\n              _closeSteps: () => resolveRead(true),\n              _errorSteps: rejectRead\n            }\n          );\n        });\n      });\n    }\n\n    // Errors must be propagated forward\n    isOrBecomesErrored(source, reader._closedPromise, storedError => {\n      if (!preventAbort) {\n        shutdownWithAction(() => WritableStreamAbort(dest, storedError), true, storedError);\n      } else {\n        shutdown(true, storedError);\n      }\n    });\n\n    // Errors must be propagated backward\n    isOrBecomesErrored(dest, writer._closedPromise, storedError => {\n      if (!preventCancel) {\n        shutdownWithAction(() => ReadableStreamCancel(source, storedError), true, storedError);\n      } else {\n        shutdown(true, storedError);\n      }\n    });\n\n    // Closing must be propagated forward\n    isOrBecomesClosed(source, reader._closedPromise, () => {\n      if (!preventClose) {\n        shutdownWithAction(() => WritableStreamDefaultWriterCloseWithErrorPropagation(writer));\n      } else {\n        shutdown();\n      }\n    });\n\n    // Closing must be propagated backward\n    if (WritableStreamCloseQueuedOrInFlight(dest) || dest._state === 'closed') {\n      const destClosed = new TypeError('the destination writable stream closed before all data could be piped to it');\n\n      if (!preventCancel) {\n        shutdownWithAction(() => ReadableStreamCancel(source, destClosed), true, destClosed);\n      } else {\n        shutdown(true, destClosed);\n      }\n    }\n\n    setPromiseIsHandledToTrue(pipeLoop());\n\n    function waitForWritesToFinish(): Promise<void> {\n      // Another write may have started while we were waiting on this currentWrite, so we have to be sure to wait\n      // for that too.\n      const oldCurrentWrite = currentWrite;\n      return PerformPromiseThen(\n        currentWrite,\n        () => oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined\n      );\n    }\n\n    function isOrBecomesErrored(stream: ReadableStream | WritableStream,\n                                promise: Promise<void>,\n                                action: (reason: any) => void) {\n      if (stream._state === 'errored') {\n        action(stream._storedError);\n      } else {\n        uponRejection(promise, action);\n      }\n    }\n\n    function isOrBecomesClosed(stream: ReadableStream | WritableStream, promise: Promise<void>, action: () => void) {\n      if (stream._state === 'closed') {\n        action();\n      } else {\n        uponFulfillment(promise, action);\n      }\n    }\n\n    function shutdownWithAction(action: () => Promise<unknown>, originalIsError?: boolean, originalError?: any) {\n      if (shuttingDown) {\n        return;\n      }\n      shuttingDown = true;\n\n      if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {\n        uponFulfillment(waitForWritesToFinish(), doTheRest);\n      } else {\n        doTheRest();\n      }\n\n      function doTheRest() {\n        uponPromise(\n          action(),\n          () => finalize(originalIsError, originalError),\n          newError => finalize(true, newError)\n        );\n      }\n    }\n\n    function shutdown(isError?: boolean, error?: any) {\n      if (shuttingDown) {\n        return;\n      }\n      shuttingDown = true;\n\n      if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {\n        uponFulfillment(waitForWritesToFinish(), () => finalize(isError, error));\n      } else {\n        finalize(isError, error);\n      }\n    }\n\n    function finalize(isError?: boolean, error?: any) {\n      WritableStreamDefaultWriterRelease(writer);\n      ReadableStreamReaderGenericRelease(reader);\n\n      if (signal !== undefined) {\n        signal.removeEventListener('abort', abortAlgorithm);\n      }\n      if (isError) {\n        reject(error);\n      } else {\n        resolve(undefined);\n      }\n    }\n  });\n}\n","import { QueuingStrategySizeCallback } from '../queuing-strategy';\nimport assert from '../../stub/assert';\nimport { DequeueValue, EnqueueValueWithSize, QueuePair, ResetQueue } from '../abstract-ops/queue-with-sizes';\nimport {\n  ReadableStreamAddReadRequest,\n  ReadableStreamFulfillReadRequest,\n  ReadableStreamGetNumReadRequests,\n  ReadRequest\n} from './default-reader';\nimport { SimpleQueue } from '../simple-queue';\nimport { IsReadableStreamLocked, ReadableStream, ReadableStreamClose, ReadableStreamError } from '../readable-stream';\nimport { ValidatedUnderlyingSource } from './underlying-source';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { CancelSteps, PullSteps } from '../abstract-ops/internal-methods';\nimport { promiseResolvedWith, uponPromise } from '../helpers/webidl';\n\n/**\n * Allows control of a {@link ReadableStream | readable stream}'s state and internal queue.\n *\n * @public\n */\nexport class ReadableStreamDefaultController<R> {\n  /** @internal */\n  _controlledReadableStream!: ReadableStream<R>;\n  /** @internal */\n  _queue!: SimpleQueue<QueuePair<R>>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _closeRequested!: boolean;\n  /** @internal */\n  _pullAgain!: boolean;\n  /** @internal */\n  _pulling !: boolean;\n  /** @internal */\n  _strategySizeAlgorithm!: QueuingStrategySizeCallback<R>;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _pullAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _cancelAlgorithm!: (reason: any) => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is\n   * over-full. An underlying source ought to use this information to determine when and how to apply backpressure.\n   */\n  get desiredSize(): number | null {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('desiredSize');\n    }\n\n    return ReadableStreamDefaultControllerGetDesiredSize(this);\n  }\n\n  /**\n   * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from\n   * the stream, but once those are read, the stream will become closed.\n   */\n  close(): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('close');\n    }\n\n    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {\n      throw new TypeError('The stream is not in a state that permits close');\n    }\n\n    ReadableStreamDefaultControllerClose(this);\n  }\n\n  /**\n   * Enqueues the given chunk `chunk` in the controlled readable stream.\n   */\n  enqueue(chunk: R): void;\n  enqueue(chunk: R = undefined!): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('enqueue');\n    }\n\n    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {\n      throw new TypeError('The stream is not in a state that permits enqueue');\n    }\n\n    return ReadableStreamDefaultControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.\n   */\n  error(e: any = undefined): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n\n    ReadableStreamDefaultControllerError(this, e);\n  }\n\n  /** @internal */\n  [CancelSteps](reason: any): Promise<void> {\n    ResetQueue(this);\n    const result = this._cancelAlgorithm(reason);\n    ReadableStreamDefaultControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [PullSteps](readRequest: ReadRequest<R>): void {\n    const stream = this._controlledReadableStream;\n\n    if (this._queue.length > 0) {\n      const chunk = DequeueValue(this);\n\n      if (this._closeRequested && this._queue.length === 0) {\n        ReadableStreamDefaultControllerClearAlgorithms(this);\n        ReadableStreamClose(stream);\n      } else {\n        ReadableStreamDefaultControllerCallPullIfNeeded(this);\n      }\n\n      readRequest._chunkSteps(chunk);\n    } else {\n      ReadableStreamAddReadRequest(stream, readRequest);\n      ReadableStreamDefaultControllerCallPullIfNeeded(this);\n    }\n  }\n}\n\nObject.defineProperties(ReadableStreamDefaultController.prototype, {\n  close: { enumerable: true },\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Abstract operations for the ReadableStreamDefaultController.\n\nfunction IsReadableStreamDefaultController<R = any>(x: any): x is ReadableStreamDefaultController<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableStream')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamDefaultController;\n}\n\nfunction ReadableStreamDefaultControllerCallPullIfNeeded(controller: ReadableStreamDefaultController<any>): void {\n  const shouldPull = ReadableStreamDefaultControllerShouldCallPull(controller);\n  if (!shouldPull) {\n    return;\n  }\n\n  if (controller._pulling) {\n    controller._pullAgain = true;\n    return;\n  }\n\n  assert(!controller._pullAgain);\n\n  controller._pulling = true;\n\n  const pullPromise = controller._pullAlgorithm();\n  uponPromise(\n    pullPromise,\n    () => {\n      controller._pulling = false;\n\n      if (controller._pullAgain) {\n        controller._pullAgain = false;\n        ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n      }\n    },\n    e => {\n      ReadableStreamDefaultControllerError(controller, e);\n    }\n  );\n}\n\nfunction ReadableStreamDefaultControllerShouldCallPull(controller: ReadableStreamDefaultController<any>): boolean {\n  const stream = controller._controlledReadableStream;\n\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return false;\n  }\n\n  if (!controller._started) {\n    return false;\n  }\n\n  if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    return true;\n  }\n\n  const desiredSize = ReadableStreamDefaultControllerGetDesiredSize(controller);\n  assert(desiredSize !== null);\n  if (desiredSize! > 0) {\n    return true;\n  }\n\n  return false;\n}\n\nfunction ReadableStreamDefaultControllerClearAlgorithms(controller: ReadableStreamDefaultController<any>) {\n  controller._pullAlgorithm = undefined!;\n  controller._cancelAlgorithm = undefined!;\n  controller._strategySizeAlgorithm = undefined!;\n}\n\n// A client of ReadableStreamDefaultController may use these functions directly to bypass state check.\n\nexport function ReadableStreamDefaultControllerClose(controller: ReadableStreamDefaultController<any>) {\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return;\n  }\n\n  const stream = controller._controlledReadableStream;\n\n  controller._closeRequested = true;\n\n  if (controller._queue.length === 0) {\n    ReadableStreamDefaultControllerClearAlgorithms(controller);\n    ReadableStreamClose(stream);\n  }\n}\n\nexport function ReadableStreamDefaultControllerEnqueue<R>(\n  controller: ReadableStreamDefaultController<R>,\n  chunk: R\n): void {\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return;\n  }\n\n  const stream = controller._controlledReadableStream;\n\n  if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    ReadableStreamFulfillReadRequest(stream, chunk, false);\n  } else {\n    let chunkSize;\n    try {\n      chunkSize = controller._strategySizeAlgorithm(chunk);\n    } catch (chunkSizeE) {\n      ReadableStreamDefaultControllerError(controller, chunkSizeE);\n      throw chunkSizeE;\n    }\n\n    try {\n      EnqueueValueWithSize(controller, chunk, chunkSize);\n    } catch (enqueueE) {\n      ReadableStreamDefaultControllerError(controller, enqueueE);\n      throw enqueueE;\n    }\n  }\n\n  ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n}\n\nexport function ReadableStreamDefaultControllerError(controller: ReadableStreamDefaultController<any>, e: any) {\n  const stream = controller._controlledReadableStream;\n\n  if (stream._state !== 'readable') {\n    return;\n  }\n\n  ResetQueue(controller);\n\n  ReadableStreamDefaultControllerClearAlgorithms(controller);\n  ReadableStreamError(stream, e);\n}\n\nexport function ReadableStreamDefaultControllerGetDesiredSize(\n  controller: ReadableStreamDefaultController<any>\n): number | null {\n  const state = controller._controlledReadableStream._state;\n\n  if (state === 'errored') {\n    return null;\n  }\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\n// This is used in the implementation of TransformStream.\nexport function ReadableStreamDefaultControllerHasBackpressure(\n  controller: ReadableStreamDefaultController<any>\n): boolean {\n  if (ReadableStreamDefaultControllerShouldCallPull(controller)) {\n    return false;\n  }\n\n  return true;\n}\n\nexport function ReadableStreamDefaultControllerCanCloseOrEnqueue(\n  controller: ReadableStreamDefaultController<any>\n): boolean {\n  const state = controller._controlledReadableStream._state;\n\n  if (!controller._closeRequested && state === 'readable') {\n    return true;\n  }\n\n  return false;\n}\n\nexport function SetUpReadableStreamDefaultController<R>(stream: ReadableStream<R>,\n                                                        controller: ReadableStreamDefaultController<R>,\n                                                        startAlgorithm: () => void | PromiseLike<void>,\n                                                        pullAlgorithm: () => Promise<void>,\n                                                        cancelAlgorithm: (reason: any) => Promise<void>,\n                                                        highWaterMark: number,\n                                                        sizeAlgorithm: QueuingStrategySizeCallback<R>) {\n  assert(stream._readableStreamController === undefined);\n\n  controller._controlledReadableStream = stream;\n\n  controller._queue = undefined!;\n  controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._started = false;\n  controller._closeRequested = false;\n  controller._pullAgain = false;\n  controller._pulling = false;\n\n  controller._strategySizeAlgorithm = sizeAlgorithm;\n  controller._strategyHWM = highWaterMark;\n\n  controller._pullAlgorithm = pullAlgorithm;\n  controller._cancelAlgorithm = cancelAlgorithm;\n\n  stream._readableStreamController = controller;\n\n  const startResult = startAlgorithm();\n  uponPromise(\n    promiseResolvedWith(startResult),\n    () => {\n      controller._started = true;\n\n      assert(!controller._pulling);\n      assert(!controller._pullAgain);\n\n      ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n    },\n    r => {\n      ReadableStreamDefaultControllerError(controller, r);\n    }\n  );\n}\n\nexport function SetUpReadableStreamDefaultControllerFromUnderlyingSource<R>(\n  stream: ReadableStream<R>,\n  underlyingSource: ValidatedUnderlyingSource<R>,\n  highWaterMark: number,\n  sizeAlgorithm: QueuingStrategySizeCallback<R>\n) {\n  const controller: ReadableStreamDefaultController<R> = Object.create(ReadableStreamDefaultController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let pullAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let cancelAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingSource.start !== undefined) {\n    startAlgorithm = () => underlyingSource.start!(controller);\n  }\n  if (underlyingSource.pull !== undefined) {\n    pullAlgorithm = () => underlyingSource.pull!(controller);\n  }\n  if (underlyingSource.cancel !== undefined) {\n    cancelAlgorithm = reason => underlyingSource.cancel!(reason);\n  }\n\n  SetUpReadableStreamDefaultController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm\n  );\n}\n\n// Helper functions for the ReadableStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamDefaultController.prototype.${name} can only be used on a ReadableStreamDefaultController`);\n}\n","import {\n  CreateReadableByteStream,\n  CreateReadableStream,\n  IsReadableStream,\n  ReadableByteStream,\n  ReadableStream,\n  ReadableStreamCancel,\n  ReadableStreamReader\n} from '../readable-stream';\nimport { ReadableStreamReaderGenericRelease } from './generic-reader';\nimport {\n  AcquireReadableStreamDefaultReader,\n  IsReadableStreamDefaultReader,\n  ReadableStreamDefaultReaderRead,\n  ReadRequest\n} from './default-reader';\nimport {\n  AcquireReadableStreamBYOBReader,\n  IsReadableStreamBYOBReader,\n  ReadableStreamBYOBReaderRead,\n  ReadIntoRequest\n} from './byob-reader';\nimport assert from '../../stub/assert';\nimport { newPromise, promiseResolvedWith, queueMicrotask, uponRejection } from '../helpers/webidl';\nimport {\n  ReadableStreamDefaultController,\n  ReadableStreamDefaultControllerClose,\n  ReadableStreamDefaultControllerEnqueue,\n  ReadableStreamDefaultControllerError\n} from './default-controller';\nimport {\n  IsReadableByteStreamController,\n  ReadableByteStreamControllerClose,\n  ReadableByteStreamControllerEnqueue,\n  ReadableByteStreamControllerError,\n  ReadableByteStreamControllerGetBYOBRequest,\n  ReadableByteStreamControllerRespond,\n  ReadableByteStreamControllerRespondWithNewView\n} from './byte-stream-controller';\nimport { CreateArrayFromList } from '../abstract-ops/ecmascript';\nimport { CloneAsUint8Array } from '../abstract-ops/miscellaneous';\n\nexport function ReadableStreamTee<R>(stream: ReadableStream<R>,\n                                     cloneForBranch2: boolean): [ReadableStream<R>, ReadableStream<R>] {\n  assert(IsReadableStream(stream));\n  assert(typeof cloneForBranch2 === 'boolean');\n  if (IsReadableByteStreamController(stream._readableStreamController)) {\n    return ReadableByteStreamTee(stream as unknown as ReadableByteStream) as\n      unknown as [ReadableStream<R>, ReadableStream<R>];\n  }\n  return ReadableStreamDefaultTee(stream, cloneForBranch2);\n}\n\nexport function ReadableStreamDefaultTee<R>(stream: ReadableStream<R>,\n                                            cloneForBranch2: boolean): [ReadableStream<R>, ReadableStream<R>] {\n  assert(IsReadableStream(stream));\n  assert(typeof cloneForBranch2 === 'boolean');\n\n  const reader = AcquireReadableStreamDefaultReader<R>(stream);\n\n  let reading = false;\n  let readAgain = false;\n  let canceled1 = false;\n  let canceled2 = false;\n  let reason1: any;\n  let reason2: any;\n  let branch1: ReadableStream<R>;\n  let branch2: ReadableStream<R>;\n\n  let resolveCancelPromise: (value: undefined | Promise<undefined>) => void;\n  const cancelPromise = newPromise<undefined>(resolve => {\n    resolveCancelPromise = resolve;\n  });\n\n  function pullAlgorithm(): Promise<void> {\n    if (reading) {\n      readAgain = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgain = false;\n          const chunk1 = chunk;\n          const chunk2 = chunk;\n\n          // There is no way to access the cloning code right now in the reference implementation.\n          // If we add one then we'll need an implementation for serializable objects.\n          // if (!canceled2 && cloneForBranch2) {\n          //   chunk2 = StructuredDeserialize(StructuredSerialize(chunk2));\n          // }\n\n          if (!canceled1) {\n            ReadableStreamDefaultControllerEnqueue(\n              branch1._readableStreamController as ReadableStreamDefaultController<R>,\n              chunk1\n            );\n          }\n          if (!canceled2) {\n            ReadableStreamDefaultControllerEnqueue(\n              branch2._readableStreamController as ReadableStreamDefaultController<R>,\n              chunk2\n            );\n          }\n\n          reading = false;\n          if (readAgain) {\n            pullAlgorithm();\n          }\n        });\n      },\n      _closeSteps: () => {\n        reading = false;\n        if (!canceled1) {\n          ReadableStreamDefaultControllerClose(branch1._readableStreamController as ReadableStreamDefaultController<R>);\n        }\n        if (!canceled2) {\n          ReadableStreamDefaultControllerClose(branch2._readableStreamController as ReadableStreamDefaultController<R>);\n        }\n\n        if (!canceled1 || !canceled2) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function cancel1Algorithm(reason: any): Promise<void> {\n    canceled1 = true;\n    reason1 = reason;\n    if (canceled2) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function cancel2Algorithm(reason: any): Promise<void> {\n    canceled2 = true;\n    reason2 = reason;\n    if (canceled1) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function startAlgorithm() {\n    // do nothing\n  }\n\n  branch1 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel1Algorithm);\n  branch2 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel2Algorithm);\n\n  uponRejection(reader._closedPromise, (r: any) => {\n    ReadableStreamDefaultControllerError(branch1._readableStreamController as ReadableStreamDefaultController<R>, r);\n    ReadableStreamDefaultControllerError(branch2._readableStreamController as ReadableStreamDefaultController<R>, r);\n    if (!canceled1 || !canceled2) {\n      resolveCancelPromise(undefined);\n    }\n  });\n\n  return [branch1, branch2];\n}\n\nexport function ReadableByteStreamTee(stream: ReadableByteStream): [ReadableByteStream, ReadableByteStream] {\n  assert(IsReadableStream(stream));\n  assert(IsReadableByteStreamController(stream._readableStreamController));\n\n  let reader: ReadableStreamReader<Uint8Array> = AcquireReadableStreamDefaultReader(stream);\n  let reading = false;\n  let readAgainForBranch1 = false;\n  let readAgainForBranch2 = false;\n  let canceled1 = false;\n  let canceled2 = false;\n  let reason1: any;\n  let reason2: any;\n  let branch1: ReadableByteStream;\n  let branch2: ReadableByteStream;\n\n  let resolveCancelPromise: (value: undefined | Promise<undefined>) => void;\n  const cancelPromise = newPromise<void>(resolve => {\n    resolveCancelPromise = resolve;\n  });\n\n  function forwardReaderError(thisReader: ReadableStreamReader<Uint8Array>) {\n    uponRejection(thisReader._closedPromise, r => {\n      if (thisReader !== reader) {\n        return;\n      }\n      ReadableByteStreamControllerError(branch1._readableStreamController, r);\n      ReadableByteStreamControllerError(branch2._readableStreamController, r);\n      if (!canceled1 || !canceled2) {\n        resolveCancelPromise(undefined);\n      }\n    });\n  }\n\n  function pullWithDefaultReader() {\n    if (IsReadableStreamBYOBReader(reader)) {\n      assert(reader._readIntoRequests.length === 0);\n      ReadableStreamReaderGenericRelease(reader);\n\n      reader = AcquireReadableStreamDefaultReader(stream);\n      forwardReaderError(reader);\n    }\n\n    const readRequest: ReadRequest<Uint8Array> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgainForBranch1 = false;\n          readAgainForBranch2 = false;\n\n          const chunk1 = chunk;\n          let chunk2 = chunk;\n          if (!canceled1 && !canceled2) {\n            try {\n              chunk2 = CloneAsUint8Array(chunk);\n            } catch (cloneE) {\n              ReadableByteStreamControllerError(branch1._readableStreamController, cloneE);\n              ReadableByteStreamControllerError(branch2._readableStreamController, cloneE);\n              resolveCancelPromise(ReadableStreamCancel(stream, cloneE));\n              return;\n            }\n          }\n\n          if (!canceled1) {\n            ReadableByteStreamControllerEnqueue(branch1._readableStreamController, chunk1);\n          }\n          if (!canceled2) {\n            ReadableByteStreamControllerEnqueue(branch2._readableStreamController, chunk2);\n          }\n\n          reading = false;\n          if (readAgainForBranch1) {\n            pull1Algorithm();\n          } else if (readAgainForBranch2) {\n            pull2Algorithm();\n          }\n        });\n      },\n      _closeSteps: () => {\n        reading = false;\n        if (!canceled1) {\n          ReadableByteStreamControllerClose(branch1._readableStreamController);\n        }\n        if (!canceled2) {\n          ReadableByteStreamControllerClose(branch2._readableStreamController);\n        }\n        if (branch1._readableStreamController._pendingPullIntos.length > 0) {\n          ReadableByteStreamControllerRespond(branch1._readableStreamController, 0);\n        }\n        if (branch2._readableStreamController._pendingPullIntos.length > 0) {\n          ReadableByteStreamControllerRespond(branch2._readableStreamController, 0);\n        }\n        if (!canceled1 || !canceled2) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n  }\n\n  function pullWithBYOBReader(view: ArrayBufferView, forBranch2: boolean) {\n    if (IsReadableStreamDefaultReader<Uint8Array>(reader)) {\n      assert(reader._readRequests.length === 0);\n      ReadableStreamReaderGenericRelease(reader);\n\n      reader = AcquireReadableStreamBYOBReader(stream);\n      forwardReaderError(reader);\n    }\n\n    const byobBranch = forBranch2 ? branch2 : branch1;\n    const otherBranch = forBranch2 ? branch1 : branch2;\n\n    const readIntoRequest: ReadIntoRequest<ArrayBufferView> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgainForBranch1 = false;\n          readAgainForBranch2 = false;\n\n          const byobCanceled = forBranch2 ? canceled2 : canceled1;\n          const otherCanceled = forBranch2 ? canceled1 : canceled2;\n\n          if (!otherCanceled) {\n            let clonedChunk;\n            try {\n              clonedChunk = CloneAsUint8Array(chunk);\n            } catch (cloneE) {\n              ReadableByteStreamControllerError(byobBranch._readableStreamController, cloneE);\n              ReadableByteStreamControllerError(otherBranch._readableStreamController, cloneE);\n              resolveCancelPromise(ReadableStreamCancel(stream, cloneE));\n              return;\n            }\n            if (!byobCanceled) {\n              ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n            }\n            ReadableByteStreamControllerEnqueue(otherBranch._readableStreamController, clonedChunk);\n          } else if (!byobCanceled) {\n            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n          }\n\n          reading = false;\n          if (readAgainForBranch1) {\n            pull1Algorithm();\n          } else if (readAgainForBranch2) {\n            pull2Algorithm();\n          }\n        });\n      },\n      _closeSteps: chunk => {\n        reading = false;\n\n        const byobCanceled = forBranch2 ? canceled2 : canceled1;\n        const otherCanceled = forBranch2 ? canceled1 : canceled2;\n\n        if (!byobCanceled) {\n          ReadableByteStreamControllerClose(byobBranch._readableStreamController);\n        }\n        if (!otherCanceled) {\n          ReadableByteStreamControllerClose(otherBranch._readableStreamController);\n        }\n\n        if (chunk !== undefined) {\n          assert(chunk.byteLength === 0);\n\n          if (!byobCanceled) {\n            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n          }\n          if (!otherCanceled && otherBranch._readableStreamController._pendingPullIntos.length > 0) {\n            ReadableByteStreamControllerRespond(otherBranch._readableStreamController, 0);\n          }\n        }\n\n        if (!byobCanceled || !otherCanceled) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamBYOBReaderRead(reader, view, readIntoRequest);\n  }\n\n  function pull1Algorithm(): Promise<void> {\n    if (reading) {\n      readAgainForBranch1 = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch1._readableStreamController);\n    if (byobRequest === null) {\n      pullWithDefaultReader();\n    } else {\n      pullWithBYOBReader(byobRequest._view!, false);\n    }\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function pull2Algorithm(): Promise<void> {\n    if (reading) {\n      readAgainForBranch2 = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch2._readableStreamController);\n    if (byobRequest === null) {\n      pullWithDefaultReader();\n    } else {\n      pullWithBYOBReader(byobRequest._view!, true);\n    }\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function cancel1Algorithm(reason: any): Promise<void> {\n    canceled1 = true;\n    reason1 = reason;\n    if (canceled2) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function cancel2Algorithm(reason: any): Promise<void> {\n    canceled2 = true;\n    reason2 = reason;\n    if (canceled1) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function startAlgorithm(): void {\n    return;\n  }\n\n  branch1 = CreateReadableByteStream(startAlgorithm, pull1Algorithm, cancel1Algorithm);\n  branch2 = CreateReadableByteStream(startAlgorithm, pull2Algorithm, cancel2Algorithm);\n\n  forwardReaderError(reader);\n\n  return [branch1, branch2];\n}\n","import { assertDictionary, assertFunction, convertUnsignedLongLongWithEnforceRange } from './basic';\nimport {\n  ReadableStreamController,\n  UnderlyingByteSource,\n  UnderlyingDefaultOrByteSource,\n  UnderlyingDefaultOrByteSourcePullCallback,\n  UnderlyingDefaultOrByteSourceStartCallback,\n  UnderlyingSource,\n  UnderlyingSourceCancelCallback,\n  ValidatedUnderlyingDefaultOrByteSource\n} from '../readable-stream/underlying-source';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\n\nexport function convertUnderlyingDefaultOrByteSource<R>(\n  source: UnderlyingSource<R> | UnderlyingByteSource | null,\n  context: string\n): ValidatedUnderlyingDefaultOrByteSource<R> {\n  assertDictionary(source, context);\n  const original = source as (UnderlyingDefaultOrByteSource<R> | null);\n  const autoAllocateChunkSize = original?.autoAllocateChunkSize;\n  const cancel = original?.cancel;\n  const pull = original?.pull;\n  const start = original?.start;\n  const type = original?.type;\n  return {\n    autoAllocateChunkSize: autoAllocateChunkSize === undefined ?\n      undefined :\n      convertUnsignedLongLongWithEnforceRange(\n        autoAllocateChunkSize,\n        `${context} has member 'autoAllocateChunkSize' that`\n      ),\n    cancel: cancel === undefined ?\n      undefined :\n      convertUnderlyingSourceCancelCallback(cancel, original!, `${context} has member 'cancel' that`),\n    pull: pull === undefined ?\n      undefined :\n      convertUnderlyingSourcePullCallback(pull, original!, `${context} has member 'pull' that`),\n    start: start === undefined ?\n      undefined :\n      convertUnderlyingSourceStartCallback(start, original!, `${context} has member 'start' that`),\n    type: type === undefined ? undefined : convertReadableStreamType(type, `${context} has member 'type' that`)\n  };\n}\n\nfunction convertUnderlyingSourceCancelCallback(\n  fn: UnderlyingSourceCancelCallback,\n  original: UnderlyingDefaultOrByteSource,\n  context: string\n): (reason: any) => Promise<void> {\n  assertFunction(fn, context);\n  return (reason: any) => promiseCall(fn, original, [reason]);\n}\n\nfunction convertUnderlyingSourcePullCallback<R>(\n  fn: UnderlyingDefaultOrByteSourcePullCallback<R>,\n  original: UnderlyingDefaultOrByteSource<R>,\n  context: string\n): (controller: ReadableStreamController<R>) => Promise<void> {\n  assertFunction(fn, context);\n  return (controller: ReadableStreamController<R>) => promiseCall(fn, original, [controller]);\n}\n\nfunction convertUnderlyingSourceStartCallback<R>(\n  fn: UnderlyingDefaultOrByteSourceStartCallback<R>,\n  original: UnderlyingDefaultOrByteSource<R>,\n  context: string\n): UnderlyingDefaultOrByteSourceStartCallback<R> {\n  assertFunction(fn, context);\n  return (controller: ReadableStreamController<R>) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertReadableStreamType(type: string, context: string): 'bytes' {\n  type = `${type}`;\n  if (type !== 'bytes') {\n    throw new TypeError(`${context} '${type}' is not a valid enumeration value for ReadableStreamType`);\n  }\n  return type;\n}\n","import { assertDictionary } from './basic';\nimport { ReadableStreamGetReaderOptions } from '../readable-stream/reader-options';\n\nexport function convertReaderOptions(options: ReadableStreamGetReaderOptions | null | undefined,\n                                     context: string): ReadableStreamGetReaderOptions {\n  assertDictionary(options, context);\n  const mode = options?.mode;\n  return {\n    mode: mode === undefined ? undefined : convertReadableStreamReaderMode(mode, `${context} has member 'mode' that`)\n  };\n}\n\nfunction convertReadableStreamReaderMode(mode: string, context: string): 'byob' {\n  mode = `${mode}`;\n  if (mode !== 'byob') {\n    throw new TypeError(`${context} '${mode}' is not a valid enumeration value for ReadableStreamReaderMode`);\n  }\n  return mode;\n}\n","import { assertDictionary } from './basic';\nimport {\n  ReadableStreamIteratorOptions,\n  ValidatedReadableStreamIteratorOptions\n} from '../readable-stream/iterator-options';\n\nexport function convertIteratorOptions(options: ReadableStreamIteratorOptions | null | undefined,\n                                       context: string): ValidatedReadableStreamIteratorOptions {\n  assertDictionary(options, context);\n  const preventCancel = options?.preventCancel;\n  return { preventCancel: Boolean(preventCancel) };\n}\n","import { assertDictionary } from './basic';\nimport { StreamPipeOptions, ValidatedStreamPipeOptions } from '../readable-stream/pipe-options';\nimport { AbortSignal, isAbortSignal } from '../abort-signal';\n\nexport function convertPipeOptions(options: StreamPipeOptions | null | undefined,\n                                   context: string): ValidatedStreamPipeOptions {\n  assertDictionary(options, context);\n  const preventAbort = options?.preventAbort;\n  const preventCancel = options?.preventCancel;\n  const preventClose = options?.preventClose;\n  const signal = options?.signal;\n  if (signal !== undefined) {\n    assertAbortSignal(signal, `${context} has member 'signal' that`);\n  }\n  return {\n    preventAbort: Boolean(preventAbort),\n    preventCancel: Boolean(preventCancel),\n    preventClose: Boolean(preventClose),\n    signal\n  };\n}\n\nfunction assertAbortSignal(signal: unknown, context: string): asserts signal is AbortSignal {\n  if (!isAbortSignal(signal)) {\n    throw new TypeError(`${context} is not an AbortSignal.`);\n  }\n}\n","import { assertDictionary, assertRequiredField } from './basic';\nimport { ReadableStream } from '../readable-stream';\nimport { WritableStream } from '../writable-stream';\nimport { assertReadableStream } from './readable-stream';\nimport { assertWritableStream } from './writable-stream';\n\nexport function convertReadableWritablePair<RS extends ReadableStream, WS extends WritableStream>(\n  pair: { readable: RS; writable: WS } | null | undefined,\n  context: string\n): { readable: RS; writable: WS } {\n  assertDictionary(pair, context);\n\n  const readable = pair?.readable;\n  assertRequiredField(readable, 'readable', 'ReadableWritablePair');\n  assertReadableStream(readable, `${context} has member 'readable' that`);\n\n  const writable = pair?.writable;\n  assertRequiredField(writable, 'writable', 'ReadableWritablePair');\n  assertWritableStream(writable, `${context} has member 'writable' that`);\n\n  return { readable, writable };\n}\n","import assert from '../stub/assert';\nimport {\n  promiseRejectedWith,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  transformPromiseWith\n} from './helpers/webidl';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { AcquireReadableStreamAsyncIterator, ReadableStreamAsyncIterator } from './readable-stream/async-iterator';\nimport { defaultReaderClosedPromiseReject, defaultReaderClosedPromiseResolve } from './readable-stream/generic-reader';\nimport {\n  AcquireReadableStreamDefaultReader,\n  IsReadableStreamDefaultReader,\n  ReadableStreamDefaultReader,\n  ReadableStreamDefaultReadResult\n} from './readable-stream/default-reader';\nimport {\n  AcquireReadableStreamBYOBReader,\n  IsReadableStreamBYOBReader,\n  ReadableStreamBYOBReader,\n  ReadableStreamBYOBReadResult\n} from './readable-stream/byob-reader';\nimport { ReadableStreamPipeTo } from './readable-stream/pipe';\nimport { ReadableStreamTee } from './readable-stream/tee';\nimport { IsWritableStream, IsWritableStreamLocked, WritableStream } from './writable-stream';\nimport { SimpleQueue } from './simple-queue';\nimport {\n  ReadableByteStreamController,\n  ReadableStreamBYOBRequest,\n  SetUpReadableByteStreamController,\n  SetUpReadableByteStreamControllerFromUnderlyingSource\n} from './readable-stream/byte-stream-controller';\nimport {\n  ReadableStreamDefaultController,\n  SetUpReadableStreamDefaultController,\n  SetUpReadableStreamDefaultControllerFromUnderlyingSource\n} from './readable-stream/default-controller';\nimport {\n  UnderlyingByteSource,\n  UnderlyingByteSourcePullCallback,\n  UnderlyingByteSourceStartCallback,\n  UnderlyingSource,\n  UnderlyingSourceCancelCallback,\n  UnderlyingSourcePullCallback,\n  UnderlyingSourceStartCallback\n} from './readable-stream/underlying-source';\nimport { noop } from '../utils';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { CreateArrayFromList } from './abstract-ops/ecmascript';\nimport { CancelSteps } from './abstract-ops/internal-methods';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { assertObject, assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport { convertUnderlyingDefaultOrByteSource } from './validators/underlying-source';\nimport { ReadableStreamGetReaderOptions } from './readable-stream/reader-options';\nimport { convertReaderOptions } from './validators/reader-options';\nimport { StreamPipeOptions, ValidatedStreamPipeOptions } from './readable-stream/pipe-options';\nimport { ReadableStreamIteratorOptions } from './readable-stream/iterator-options';\nimport { convertIteratorOptions } from './validators/iterator-options';\nimport { convertPipeOptions } from './validators/pipe-options';\nimport { ReadableWritablePair } from './readable-stream/readable-writable-pair';\nimport { convertReadableWritablePair } from './validators/readable-writable-pair';\n\nexport type ReadableByteStream = ReadableStream<Uint8Array> & {\n  _readableStreamController: ReadableByteStreamController\n};\n\ntype ReadableStreamState = 'readable' | 'closed' | 'errored';\n\n/**\n * A readable stream represents a source of data, from which you can read.\n *\n * @public\n */\nexport class ReadableStream<R = any> {\n  /** @internal */\n  _state!: ReadableStreamState;\n  /** @internal */\n  _reader: ReadableStreamReader<R> | undefined;\n  /** @internal */\n  _storedError: any;\n  /** @internal */\n  _disturbed!: boolean;\n  /** @internal */\n  _readableStreamController!: ReadableStreamDefaultController<R> | ReadableByteStreamController;\n\n  constructor(underlyingSource: UnderlyingByteSource, strategy?: { highWaterMark?: number; size?: undefined });\n  constructor(underlyingSource?: UnderlyingSource<R>, strategy?: QueuingStrategy<R>);\n  constructor(rawUnderlyingSource: UnderlyingSource<R> | UnderlyingByteSource | null | undefined = {},\n              rawStrategy: QueuingStrategy<R> | null | undefined = {}) {\n    if (rawUnderlyingSource === undefined) {\n      rawUnderlyingSource = null;\n    } else {\n      assertObject(rawUnderlyingSource, 'First parameter');\n    }\n\n    const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');\n    const underlyingSource = convertUnderlyingDefaultOrByteSource(rawUnderlyingSource, 'First parameter');\n\n    InitializeReadableStream(this);\n\n    if (underlyingSource.type === 'bytes') {\n      if (strategy.size !== undefined) {\n        throw new RangeError('The strategy for a byte stream cannot have a size function');\n      }\n      const highWaterMark = ExtractHighWaterMark(strategy, 0);\n      SetUpReadableByteStreamControllerFromUnderlyingSource(\n        this as unknown as ReadableByteStream,\n        underlyingSource,\n        highWaterMark\n      );\n    } else {\n      assert(underlyingSource.type === undefined);\n      const sizeAlgorithm = ExtractSizeAlgorithm(strategy);\n      const highWaterMark = ExtractHighWaterMark(strategy, 1);\n      SetUpReadableStreamDefaultControllerFromUnderlyingSource(\n        this,\n        underlyingSource,\n        highWaterMark,\n        sizeAlgorithm\n      );\n    }\n  }\n\n  /**\n   * Whether or not the readable stream is locked to a {@link ReadableStreamDefaultReader | reader}.\n   */\n  get locked(): boolean {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('locked');\n    }\n\n    return IsReadableStreamLocked(this);\n  }\n\n  /**\n   * Cancels the stream, signaling a loss of interest in the stream by a consumer.\n   *\n   * The supplied `reason` argument will be given to the underlying source's {@link UnderlyingSource.cancel | cancel()}\n   * method, which might or might not use it.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('cancel'));\n    }\n\n    if (IsReadableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot cancel a stream that already has a reader'));\n    }\n\n    return ReadableStreamCancel(this, reason);\n  }\n\n  /**\n   * Creates a {@link ReadableStreamBYOBReader} and locks the stream to the new reader.\n   *\n   * This call behaves the same way as the no-argument variant, except that it only works on readable byte streams,\n   * i.e. streams which were constructed specifically with the ability to handle \"bring your own buffer\" reading.\n   * The returned BYOB reader provides the ability to directly read individual chunks from the stream via its\n   * {@link ReadableStreamBYOBReader.read | read()} method, into developer-supplied buffers, allowing more precise\n   * control over allocation.\n   */\n  getReader({ mode }: { mode: 'byob' }): ReadableStreamBYOBReader;\n  /**\n   * Creates a {@link ReadableStreamDefaultReader} and locks the stream to the new reader.\n   * While the stream is locked, no other reader can be acquired until this one is released.\n   *\n   * This functionality is especially useful for creating abstractions that desire the ability to consume a stream\n   * in its entirety. By getting a reader for the stream, you can ensure nobody else can interleave reads with yours\n   * or cancel the stream, which would interfere with your abstraction.\n   */\n  getReader(): ReadableStreamDefaultReader<R>;\n  getReader(\n    rawOptions: ReadableStreamGetReaderOptions | null | undefined = undefined\n  ): ReadableStreamDefaultReader<R> | ReadableStreamBYOBReader {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('getReader');\n    }\n\n    const options = convertReaderOptions(rawOptions, 'First parameter');\n\n    if (options.mode === undefined) {\n      return AcquireReadableStreamDefaultReader(this);\n    }\n\n    assert(options.mode === 'byob');\n    return AcquireReadableStreamBYOBReader(this as unknown as ReadableByteStream);\n  }\n\n  /**\n   * Provides a convenient, chainable way of piping this readable stream through a transform stream\n   * (or any other `{ writable, readable }` pair). It simply {@link ReadableStream.pipeTo | pipes} the stream\n   * into the writable side of the supplied pair, and returns the readable side for further use.\n   *\n   * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.\n   */\n  pipeThrough<RS extends ReadableStream>(\n    transform: { readable: RS; writable: WritableStream<R> },\n    options?: StreamPipeOptions\n  ): RS;\n  pipeThrough<RS extends ReadableStream>(\n    rawTransform: { readable: RS; writable: WritableStream<R> } | null | undefined,\n    rawOptions: StreamPipeOptions | null | undefined = {}\n  ): RS {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('pipeThrough');\n    }\n    assertRequiredArgument(rawTransform, 1, 'pipeThrough');\n\n    const transform = convertReadableWritablePair(rawTransform, 'First parameter');\n    const options = convertPipeOptions(rawOptions, 'Second parameter');\n\n    if (IsReadableStreamLocked(this)) {\n      throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked ReadableStream');\n    }\n    if (IsWritableStreamLocked(transform.writable)) {\n      throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked WritableStream');\n    }\n\n    const promise = ReadableStreamPipeTo(\n      this, transform.writable, options.preventClose, options.preventAbort, options.preventCancel, options.signal\n    );\n\n    setPromiseIsHandledToTrue(promise);\n\n    return transform.readable;\n  }\n\n  /**\n   * Pipes this readable stream to a given writable stream. The way in which the piping process behaves under\n   * various error conditions can be customized with a number of passed options. It returns a promise that fulfills\n   * when the piping process completes successfully, or rejects if any errors were encountered.\n   *\n   * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.\n   */\n  pipeTo(destination: WritableStream<R>, options?: StreamPipeOptions): Promise<void>;\n  pipeTo(destination: WritableStream<R> | null | undefined,\n         rawOptions: StreamPipeOptions | null | undefined = {}): Promise<void> {\n    if (!IsReadableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('pipeTo'));\n    }\n\n    if (destination === undefined) {\n      return promiseRejectedWith(`Parameter 1 is required in 'pipeTo'.`);\n    }\n    if (!IsWritableStream(destination)) {\n      return promiseRejectedWith(\n        new TypeError(`ReadableStream.prototype.pipeTo's first argument must be a WritableStream`)\n      );\n    }\n\n    let options: ValidatedStreamPipeOptions;\n    try {\n      options = convertPipeOptions(rawOptions, 'Second parameter');\n    } catch (e) {\n      return promiseRejectedWith(e);\n    }\n\n    if (IsReadableStreamLocked(this)) {\n      return promiseRejectedWith(\n        new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream')\n      );\n    }\n    if (IsWritableStreamLocked(destination)) {\n      return promiseRejectedWith(\n        new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream')\n      );\n    }\n\n    return ReadableStreamPipeTo<R>(\n      this, destination, options.preventClose, options.preventAbort, options.preventCancel, options.signal\n    );\n  }\n\n  /**\n   * Tees this readable stream, returning a two-element array containing the two resulting branches as\n   * new {@link ReadableStream} instances.\n   *\n   * Teeing a stream will lock it, preventing any other consumer from acquiring a reader.\n   * To cancel the stream, cancel both of the resulting branches; a composite cancellation reason will then be\n   * propagated to the stream's underlying source.\n   *\n   * Note that the chunks seen in each branch will be the same object. If the chunks are not immutable,\n   * this could allow interference between the two branches.\n   */\n  tee(): [ReadableStream<R>, ReadableStream<R>] {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('tee');\n    }\n\n    const branches = ReadableStreamTee(this, false);\n    return CreateArrayFromList(branches);\n  }\n\n  /**\n   * Asynchronously iterates over the chunks in the stream's internal queue.\n   *\n   * Asynchronously iterating over the stream will lock it, preventing any other consumer from acquiring a reader.\n   * The lock will be released if the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method\n   * is called, e.g. by breaking out of the loop.\n   *\n   * By default, calling the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method will also\n   * cancel the stream. To prevent this, use the stream's {@link ReadableStream.values | values()} method, passing\n   * `true` for the `preventCancel` option.\n   */\n  values(options?: ReadableStreamIteratorOptions): ReadableStreamAsyncIterator<R>;\n  values(rawOptions: ReadableStreamIteratorOptions | null | undefined = undefined): ReadableStreamAsyncIterator<R> {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('values');\n    }\n\n    const options = convertIteratorOptions(rawOptions, 'First parameter');\n    return AcquireReadableStreamAsyncIterator<R>(this, options.preventCancel);\n  }\n\n  /**\n   * {@inheritDoc ReadableStream.values}\n   */\n  [Symbol.asyncIterator]: (options?: ReadableStreamIteratorOptions) => ReadableStreamAsyncIterator<R>;\n}\n\nObject.defineProperties(ReadableStream.prototype, {\n  cancel: { enumerable: true },\n  getReader: { enumerable: true },\n  pipeThrough: { enumerable: true },\n  pipeTo: { enumerable: true },\n  tee: { enumerable: true },\n  values: { enumerable: true },\n  locked: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStream.prototype, Symbol.toStringTag, {\n    value: 'ReadableStream',\n    configurable: true\n  });\n}\nif (typeof Symbol.asyncIterator === 'symbol') {\n  Object.defineProperty(ReadableStream.prototype, Symbol.asyncIterator, {\n    value: ReadableStream.prototype.values,\n    writable: true,\n    configurable: true\n  });\n}\n\nexport {\n  ReadableStreamAsyncIterator,\n  ReadableStreamDefaultReadResult,\n  ReadableStreamBYOBReadResult,\n  UnderlyingByteSource,\n  UnderlyingSource,\n  UnderlyingSourceStartCallback,\n  UnderlyingSourcePullCallback,\n  UnderlyingSourceCancelCallback,\n  UnderlyingByteSourceStartCallback,\n  UnderlyingByteSourcePullCallback,\n  StreamPipeOptions,\n  ReadableWritablePair,\n  ReadableStreamIteratorOptions\n};\n\n// Abstract operations for the ReadableStream.\n\n// Throws if and only if startAlgorithm throws.\nexport function CreateReadableStream<R>(startAlgorithm: () => void | PromiseLike<void>,\n                                        pullAlgorithm: () => Promise<void>,\n                                        cancelAlgorithm: (reason: any) => Promise<void>,\n                                        highWaterMark = 1,\n                                        sizeAlgorithm: QueuingStrategySizeCallback<R> = () => 1): ReadableStream<R> {\n  assert(IsNonNegativeNumber(highWaterMark));\n\n  const stream: ReadableStream<R> = Object.create(ReadableStream.prototype);\n  InitializeReadableStream(stream);\n\n  const controller: ReadableStreamDefaultController<R> = Object.create(ReadableStreamDefaultController.prototype);\n  SetUpReadableStreamDefaultController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm\n  );\n\n  return stream;\n}\n\n// Throws if and only if startAlgorithm throws.\nexport function CreateReadableByteStream(\n  startAlgorithm: () => void | PromiseLike<void>,\n  pullAlgorithm: () => Promise<void>,\n  cancelAlgorithm: (reason: any) => Promise<void>\n): ReadableByteStream {\n  const stream: ReadableByteStream = Object.create(ReadableStream.prototype);\n  InitializeReadableStream(stream);\n\n  const controller: ReadableByteStreamController = Object.create(ReadableByteStreamController.prototype);\n  SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, 0, undefined);\n\n  return stream;\n}\n\nfunction InitializeReadableStream(stream: ReadableStream) {\n  stream._state = 'readable';\n  stream._reader = undefined;\n  stream._storedError = undefined;\n  stream._disturbed = false;\n}\n\nexport function IsReadableStream(x: unknown): x is ReadableStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readableStreamController')) {\n    return false;\n  }\n\n  return x instanceof ReadableStream;\n}\n\nexport function IsReadableStreamDisturbed(stream: ReadableStream): boolean {\n  assert(IsReadableStream(stream));\n\n  return stream._disturbed;\n}\n\nexport function IsReadableStreamLocked(stream: ReadableStream): boolean {\n  assert(IsReadableStream(stream));\n\n  if (stream._reader === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamCancel<R>(stream: ReadableStream<R>, reason: any): Promise<undefined> {\n  stream._disturbed = true;\n\n  if (stream._state === 'closed') {\n    return promiseResolvedWith(undefined);\n  }\n  if (stream._state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  ReadableStreamClose(stream);\n\n  const reader = stream._reader;\n  if (reader !== undefined && IsReadableStreamBYOBReader(reader)) {\n    reader._readIntoRequests.forEach(readIntoRequest => {\n      readIntoRequest._closeSteps(undefined);\n    });\n    reader._readIntoRequests = new SimpleQueue();\n  }\n\n  const sourceCancelPromise = stream._readableStreamController[CancelSteps](reason);\n  return transformPromiseWith(sourceCancelPromise, noop);\n}\n\nexport function ReadableStreamClose<R>(stream: ReadableStream<R>): void {\n  assert(stream._state === 'readable');\n\n  stream._state = 'closed';\n\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return;\n  }\n\n  defaultReaderClosedPromiseResolve(reader);\n\n  if (IsReadableStreamDefaultReader<R>(reader)) {\n    reader._readRequests.forEach(readRequest => {\n      readRequest._closeSteps();\n    });\n    reader._readRequests = new SimpleQueue();\n  }\n}\n\nexport function ReadableStreamError<R>(stream: ReadableStream<R>, e: any): void {\n  assert(IsReadableStream(stream));\n  assert(stream._state === 'readable');\n\n  stream._state = 'errored';\n  stream._storedError = e;\n\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return;\n  }\n\n  defaultReaderClosedPromiseReject(reader, e);\n\n  if (IsReadableStreamDefaultReader<R>(reader)) {\n    reader._readRequests.forEach(readRequest => {\n      readRequest._errorSteps(e);\n    });\n\n    reader._readRequests = new SimpleQueue();\n  } else {\n    assert(IsReadableStreamBYOBReader(reader));\n\n    reader._readIntoRequests.forEach(readIntoRequest => {\n      readIntoRequest._errorSteps(e);\n    });\n\n    reader._readIntoRequests = new SimpleQueue();\n  }\n}\n\n// Readers\n\nexport type ReadableStreamReader<R> = ReadableStreamDefaultReader<R> | ReadableStreamBYOBReader;\n\nexport {\n  ReadableStreamDefaultReader,\n  ReadableStreamBYOBReader\n};\n\n// Controllers\n\nexport {\n  ReadableStreamDefaultController,\n  ReadableStreamBYOBRequest,\n  ReadableByteStreamController\n};\n\n// Helper functions for the ReadableStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(`ReadableStream.prototype.${name} can only be used on a ReadableStream`);\n}\n","import { QueuingStrategyInit } from '../queuing-strategy';\nimport { assertDictionary, assertRequiredField, convertUnrestrictedDouble } from './basic';\n\nexport function convertQueuingStrategyInit(init: QueuingStrategyInit | null | undefined,\n                                           context: string): QueuingStrategyInit {\n  assertDictionary(init, context);\n  const highWaterMark = init?.highWaterMark;\n  assertRequiredField(highWaterMark, 'highWaterMark', 'QueuingStrategyInit');\n  return {\n    highWaterMark: convertUnrestrictedDouble(highWaterMark)\n  };\n}\n","import { QueuingStrategy, QueuingStrategyInit } from './queuing-strategy';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategyInit } from './validators/queuing-strategy-init';\n\n// The size function must not have a prototype property nor be a constructor\nconst byteLengthSizeFunction = (chunk: ArrayBufferView): number => {\n  return chunk.byteLength;\n};\ntry {\n  Object.defineProperty(byteLengthSizeFunction, 'name', {\n    value: 'size',\n    configurable: true\n  });\n} catch {\n  // This property is non-configurable in older browsers, so ignore if this throws.\n  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility\n}\n\n/**\n * A queuing strategy that counts the number of bytes in each chunk.\n *\n * @public\n */\nexport default class ByteLengthQueuingStrategy implements QueuingStrategy<ArrayBufferView> {\n  /** @internal */\n  readonly _byteLengthQueuingStrategyHighWaterMark: number;\n\n  constructor(options: QueuingStrategyInit) {\n    assertRequiredArgument(options, 1, 'ByteLengthQueuingStrategy');\n    options = convertQueuingStrategyInit(options, 'First parameter');\n    this._byteLengthQueuingStrategyHighWaterMark = options.highWaterMark;\n  }\n\n  /**\n   * Returns the high water mark provided to the constructor.\n   */\n  get highWaterMark(): number {\n    if (!IsByteLengthQueuingStrategy(this)) {\n      throw byteLengthBrandCheckException('highWaterMark');\n    }\n    return this._byteLengthQueuingStrategyHighWaterMark;\n  }\n\n  /**\n   * Measures the size of `chunk` by returning the value of its `byteLength` property.\n   */\n  get size(): (chunk: ArrayBufferView) => number {\n    if (!IsByteLengthQueuingStrategy(this)) {\n      throw byteLengthBrandCheckException('size');\n    }\n    return byteLengthSizeFunction;\n  }\n}\n\nObject.defineProperties(ByteLengthQueuingStrategy.prototype, {\n  highWaterMark: { enumerable: true },\n  size: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ByteLengthQueuingStrategy.prototype, Symbol.toStringTag, {\n    value: 'ByteLengthQueuingStrategy',\n    configurable: true\n  });\n}\n\n// Helper functions for the ByteLengthQueuingStrategy.\n\nfunction byteLengthBrandCheckException(name: string): TypeError {\n  return new TypeError(`ByteLengthQueuingStrategy.prototype.${name} can only be used on a ByteLengthQueuingStrategy`);\n}\n\nexport function IsByteLengthQueuingStrategy(x: any): x is ByteLengthQueuingStrategy {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_byteLengthQueuingStrategyHighWaterMark')) {\n    return false;\n  }\n\n  return x instanceof ByteLengthQueuingStrategy;\n}\n","import { QueuingStrategy, QueuingStrategyInit } from './queuing-strategy';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategyInit } from './validators/queuing-strategy-init';\n\n// The size function must not have a prototype property nor be a constructor\nconst countSizeFunction = (): 1 => {\n  return 1;\n};\ntry {\n  Object.defineProperty(countSizeFunction, 'name', {\n    value: 'size',\n    configurable: true\n  });\n} catch {\n  // This property is non-configurable in older browsers, so ignore if this throws.\n  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility\n}\n\n/**\n * A queuing strategy that counts the number of chunks.\n *\n * @public\n */\nexport default class CountQueuingStrategy implements QueuingStrategy<any> {\n  /** @internal */\n  readonly _countQueuingStrategyHighWaterMark!: number;\n\n  constructor(options: QueuingStrategyInit) {\n    assertRequiredArgument(options, 1, 'CountQueuingStrategy');\n    options = convertQueuingStrategyInit(options, 'First parameter');\n    this._countQueuingStrategyHighWaterMark = options.highWaterMark;\n  }\n\n  /**\n   * Returns the high water mark provided to the constructor.\n   */\n  get highWaterMark(): number {\n    if (!IsCountQueuingStrategy(this)) {\n      throw countBrandCheckException('highWaterMark');\n    }\n    return this._countQueuingStrategyHighWaterMark;\n  }\n\n  /**\n   * Measures the size of `chunk` by always returning 1.\n   * This ensures that the total queue size is a count of the number of chunks in the queue.\n   */\n  get size(): (chunk: any) => 1 {\n    if (!IsCountQueuingStrategy(this)) {\n      throw countBrandCheckException('size');\n    }\n    return countSizeFunction;\n  }\n}\n\nObject.defineProperties(CountQueuingStrategy.prototype, {\n  highWaterMark: { enumerable: true },\n  size: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(CountQueuingStrategy.prototype, Symbol.toStringTag, {\n    value: 'CountQueuingStrategy',\n    configurable: true\n  });\n}\n\n// Helper functions for the CountQueuingStrategy.\n\nfunction countBrandCheckException(name: string): TypeError {\n  return new TypeError(`CountQueuingStrategy.prototype.${name} can only be used on a CountQueuingStrategy`);\n}\n\nexport function IsCountQueuingStrategy(x: any): x is CountQueuingStrategy {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_countQueuingStrategyHighWaterMark')) {\n    return false;\n  }\n\n  return x instanceof CountQueuingStrategy;\n}\n","import { assertDictionary, assertFunction } from './basic';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\nimport {\n  Transformer,\n  TransformerFlushCallback,\n  TransformerStartCallback,\n  TransformerTransformCallback,\n  ValidatedTransformer\n} from '../transform-stream/transformer';\nimport { TransformStreamDefaultController } from '../transform-stream';\n\nexport function convertTransformer<I, O>(original: Transformer<I, O> | null,\n                                         context: string): ValidatedTransformer<I, O> {\n  assertDictionary(original, context);\n  const flush = original?.flush;\n  const readableType = original?.readableType;\n  const start = original?.start;\n  const transform = original?.transform;\n  const writableType = original?.writableType;\n  return {\n    flush: flush === undefined ?\n      undefined :\n      convertTransformerFlushCallback(flush, original!, `${context} has member 'flush' that`),\n    readableType,\n    start: start === undefined ?\n      undefined :\n      convertTransformerStartCallback(start, original!, `${context} has member 'start' that`),\n    transform: transform === undefined ?\n      undefined :\n      convertTransformerTransformCallback(transform, original!, `${context} has member 'transform' that`),\n    writableType\n  };\n}\n\nfunction convertTransformerFlushCallback<I, O>(\n  fn: TransformerFlushCallback<O>,\n  original: Transformer<I, O>,\n  context: string\n): (controller: TransformStreamDefaultController<O>) => Promise<void> {\n  assertFunction(fn, context);\n  return (controller: TransformStreamDefaultController<O>) => promiseCall(fn, original, [controller]);\n}\n\nfunction convertTransformerStartCallback<I, O>(\n  fn: TransformerStartCallback<O>,\n  original: Transformer<I, O>,\n  context: string\n): TransformerStartCallback<O> {\n  assertFunction(fn, context);\n  return (controller: TransformStreamDefaultController<O>) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertTransformerTransformCallback<I, O>(\n  fn: TransformerTransformCallback<I, O>,\n  original: Transformer<I, O>,\n  context: string\n): (chunk: I, controller: TransformStreamDefaultController<O>) => Promise<void> {\n  assertFunction(fn, context);\n  return (chunk: I, controller: TransformStreamDefaultController<O>) => promiseCall(fn, original, [chunk, controller]);\n}\n","import assert from '../stub/assert';\nimport { newPromise, promiseRejectedWith, promiseResolvedWith, transformPromiseWith } from './helpers/webidl';\nimport { CreateReadableStream, ReadableStream, ReadableStreamDefaultController } from './readable-stream';\nimport {\n  ReadableStreamDefaultControllerCanCloseOrEnqueue,\n  ReadableStreamDefaultControllerClose,\n  ReadableStreamDefaultControllerEnqueue,\n  ReadableStreamDefaultControllerError,\n  ReadableStreamDefaultControllerGetDesiredSize,\n  ReadableStreamDefaultControllerHasBackpressure\n} from './readable-stream/default-controller';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { CreateWritableStream, WritableStream, WritableStreamDefaultControllerErrorIfNeeded } from './writable-stream';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport {\n  Transformer,\n  TransformerFlushCallback,\n  TransformerStartCallback,\n  TransformerTransformCallback,\n  ValidatedTransformer\n} from './transform-stream/transformer';\nimport { convertTransformer } from './validators/transformer';\n\n// Class TransformStream\n\n/**\n * A transform stream consists of a pair of streams: a {@link WritableStream | writable stream},\n * known as its writable side, and a {@link ReadableStream | readable stream}, known as its readable side.\n * In a manner specific to the transform stream in question, writes to the writable side result in new data being\n * made available for reading from the readable side.\n *\n * @public\n */\nexport class TransformStream<I = any, O = any> {\n  /** @internal */\n  _writable!: WritableStream<I>;\n  /** @internal */\n  _readable!: ReadableStream<O>;\n  /** @internal */\n  _backpressure!: boolean;\n  /** @internal */\n  _backpressureChangePromise!: Promise<void>;\n  /** @internal */\n  _backpressureChangePromise_resolve!: () => void;\n  /** @internal */\n  _transformStreamController!: TransformStreamDefaultController<O>;\n\n  constructor(\n    transformer?: Transformer<I, O>,\n    writableStrategy?: QueuingStrategy<I>,\n    readableStrategy?: QueuingStrategy<O>\n  );\n  constructor(rawTransformer: Transformer<I, O> | null | undefined = {},\n              rawWritableStrategy: QueuingStrategy<I> | null | undefined = {},\n              rawReadableStrategy: QueuingStrategy<O> | null | undefined = {}) {\n    if (rawTransformer === undefined) {\n      rawTransformer = null;\n    }\n\n    const writableStrategy = convertQueuingStrategy(rawWritableStrategy, 'Second parameter');\n    const readableStrategy = convertQueuingStrategy(rawReadableStrategy, 'Third parameter');\n\n    const transformer = convertTransformer(rawTransformer, 'First parameter');\n    if (transformer.readableType !== undefined) {\n      throw new RangeError('Invalid readableType specified');\n    }\n    if (transformer.writableType !== undefined) {\n      throw new RangeError('Invalid writableType specified');\n    }\n\n    const readableHighWaterMark = ExtractHighWaterMark(readableStrategy, 0);\n    const readableSizeAlgorithm = ExtractSizeAlgorithm(readableStrategy);\n    const writableHighWaterMark = ExtractHighWaterMark(writableStrategy, 1);\n    const writableSizeAlgorithm = ExtractSizeAlgorithm(writableStrategy);\n\n    let startPromise_resolve!: (value: void | PromiseLike<void>) => void;\n    const startPromise = newPromise<void>(resolve => {\n      startPromise_resolve = resolve;\n    });\n\n    InitializeTransformStream(\n      this, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm\n    );\n    SetUpTransformStreamDefaultControllerFromTransformer(this, transformer);\n\n    if (transformer.start !== undefined) {\n      startPromise_resolve(transformer.start(this._transformStreamController));\n    } else {\n      startPromise_resolve(undefined);\n    }\n  }\n\n  /**\n   * The readable side of the transform stream.\n   */\n  get readable(): ReadableStream<O> {\n    if (!IsTransformStream(this)) {\n      throw streamBrandCheckException('readable');\n    }\n\n    return this._readable;\n  }\n\n  /**\n   * The writable side of the transform stream.\n   */\n  get writable(): WritableStream<I> {\n    if (!IsTransformStream(this)) {\n      throw streamBrandCheckException('writable');\n    }\n\n    return this._writable;\n  }\n}\n\nObject.defineProperties(TransformStream.prototype, {\n  readable: { enumerable: true },\n  writable: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(TransformStream.prototype, Symbol.toStringTag, {\n    value: 'TransformStream',\n    configurable: true\n  });\n}\n\nexport {\n  Transformer,\n  TransformerStartCallback,\n  TransformerFlushCallback,\n  TransformerTransformCallback\n};\n\n// Transform Stream Abstract Operations\n\nexport function CreateTransformStream<I, O>(startAlgorithm: () => void | PromiseLike<void>,\n                                            transformAlgorithm: (chunk: I) => Promise<void>,\n                                            flushAlgorithm: () => Promise<void>,\n                                            writableHighWaterMark = 1,\n                                            writableSizeAlgorithm: QueuingStrategySizeCallback<I> = () => 1,\n                                            readableHighWaterMark = 0,\n                                            readableSizeAlgorithm: QueuingStrategySizeCallback<O> = () => 1) {\n  assert(IsNonNegativeNumber(writableHighWaterMark));\n  assert(IsNonNegativeNumber(readableHighWaterMark));\n\n  const stream: TransformStream<I, O> = Object.create(TransformStream.prototype);\n\n  let startPromise_resolve!: (value: void | PromiseLike<void>) => void;\n  const startPromise = newPromise<void>(resolve => {\n    startPromise_resolve = resolve;\n  });\n\n  InitializeTransformStream(stream, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark,\n                            readableSizeAlgorithm);\n\n  const controller: TransformStreamDefaultController<O> = Object.create(TransformStreamDefaultController.prototype);\n\n  SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);\n\n  const startResult = startAlgorithm();\n  startPromise_resolve(startResult);\n  return stream;\n}\n\nfunction InitializeTransformStream<I, O>(stream: TransformStream<I, O>,\n                                         startPromise: Promise<void>,\n                                         writableHighWaterMark: number,\n                                         writableSizeAlgorithm: QueuingStrategySizeCallback<I>,\n                                         readableHighWaterMark: number,\n                                         readableSizeAlgorithm: QueuingStrategySizeCallback<O>) {\n  function startAlgorithm(): Promise<void> {\n    return startPromise;\n  }\n\n  function writeAlgorithm(chunk: I): Promise<void> {\n    return TransformStreamDefaultSinkWriteAlgorithm(stream, chunk);\n  }\n\n  function abortAlgorithm(reason: any): Promise<void> {\n    return TransformStreamDefaultSinkAbortAlgorithm(stream, reason);\n  }\n\n  function closeAlgorithm(): Promise<void> {\n    return TransformStreamDefaultSinkCloseAlgorithm(stream);\n  }\n\n  stream._writable = CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm,\n                                          writableHighWaterMark, writableSizeAlgorithm);\n\n  function pullAlgorithm(): Promise<void> {\n    return TransformStreamDefaultSourcePullAlgorithm(stream);\n  }\n\n  function cancelAlgorithm(reason: any): Promise<void> {\n    TransformStreamErrorWritableAndUnblockWrite(stream, reason);\n    return promiseResolvedWith(undefined);\n  }\n\n  stream._readable = CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, readableHighWaterMark,\n                                          readableSizeAlgorithm);\n\n  // The [[backpressure]] slot is set to undefined so that it can be initialised by TransformStreamSetBackpressure.\n  stream._backpressure = undefined!;\n  stream._backpressureChangePromise = undefined!;\n  stream._backpressureChangePromise_resolve = undefined!;\n  TransformStreamSetBackpressure(stream, true);\n\n  stream._transformStreamController = undefined!;\n}\n\nfunction IsTransformStream(x: unknown): x is TransformStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_transformStreamController')) {\n    return false;\n  }\n\n  return x instanceof TransformStream;\n}\n\n// This is a no-op if both sides are already errored.\nfunction TransformStreamError(stream: TransformStream, e: any) {\n  ReadableStreamDefaultControllerError(\n    stream._readable._readableStreamController as ReadableStreamDefaultController<any>,\n    e\n  );\n  TransformStreamErrorWritableAndUnblockWrite(stream, e);\n}\n\nfunction TransformStreamErrorWritableAndUnblockWrite(stream: TransformStream, e: any) {\n  TransformStreamDefaultControllerClearAlgorithms(stream._transformStreamController);\n  WritableStreamDefaultControllerErrorIfNeeded(stream._writable._writableStreamController, e);\n  if (stream._backpressure) {\n    // Pretend that pull() was called to permit any pending write() calls to complete. TransformStreamSetBackpressure()\n    // cannot be called from enqueue() or pull() once the ReadableStream is errored, so this will will be the final time\n    // _backpressure is set.\n    TransformStreamSetBackpressure(stream, false);\n  }\n}\n\nfunction TransformStreamSetBackpressure(stream: TransformStream, backpressure: boolean) {\n  // Passes also when called during construction.\n  assert(stream._backpressure !== backpressure);\n\n  if (stream._backpressureChangePromise !== undefined) {\n    stream._backpressureChangePromise_resolve();\n  }\n\n  stream._backpressureChangePromise = newPromise(resolve => {\n    stream._backpressureChangePromise_resolve = resolve;\n  });\n\n  stream._backpressure = backpressure;\n}\n\n// Class TransformStreamDefaultController\n\n/**\n * Allows control of the {@link ReadableStream} and {@link WritableStream} of the associated {@link TransformStream}.\n *\n * @public\n */\nexport class TransformStreamDefaultController<O> {\n  /** @internal */\n  _controlledTransformStream: TransformStream<any, O>;\n  /** @internal */\n  _transformAlgorithm: (chunk: any) => Promise<void>;\n  /** @internal */\n  _flushAlgorithm: () => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the desired size to fill the readable side’s internal queue. It can be negative, if the queue is over-full.\n   */\n  get desiredSize(): number | null {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('desiredSize');\n    }\n\n    const readableController = this._controlledTransformStream._readable._readableStreamController;\n    return ReadableStreamDefaultControllerGetDesiredSize(readableController as ReadableStreamDefaultController<O>);\n  }\n\n  /**\n   * Enqueues the given chunk `chunk` in the readable side of the controlled transform stream.\n   */\n  enqueue(chunk: O): void;\n  enqueue(chunk: O = undefined!): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('enqueue');\n    }\n\n    TransformStreamDefaultControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors both the readable side and the writable side of the controlled transform stream, making all future\n   * interactions with it fail with the given error `e`. Any chunks queued for transformation will be discarded.\n   */\n  error(reason: any = undefined): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n\n    TransformStreamDefaultControllerError(this, reason);\n  }\n\n  /**\n   * Closes the readable side and errors the writable side of the controlled transform stream. This is useful when the\n   * transformer only needs to consume a portion of the chunks written to the writable side.\n   */\n  terminate(): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('terminate');\n    }\n\n    TransformStreamDefaultControllerTerminate(this);\n  }\n}\n\nObject.defineProperties(TransformStreamDefaultController.prototype, {\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  terminate: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(TransformStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'TransformStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Transform Stream Default Controller Abstract Operations\n\nfunction IsTransformStreamDefaultController<O = any>(x: any): x is TransformStreamDefaultController<O> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledTransformStream')) {\n    return false;\n  }\n\n  return x instanceof TransformStreamDefaultController;\n}\n\nfunction SetUpTransformStreamDefaultController<I, O>(stream: TransformStream<I, O>,\n                                                     controller: TransformStreamDefaultController<O>,\n                                                     transformAlgorithm: (chunk: I) => Promise<void>,\n                                                     flushAlgorithm: () => Promise<void>) {\n  assert(IsTransformStream(stream));\n  assert(stream._transformStreamController === undefined);\n\n  controller._controlledTransformStream = stream;\n  stream._transformStreamController = controller;\n\n  controller._transformAlgorithm = transformAlgorithm;\n  controller._flushAlgorithm = flushAlgorithm;\n}\n\nfunction SetUpTransformStreamDefaultControllerFromTransformer<I, O>(stream: TransformStream<I, O>,\n                                                                    transformer: ValidatedTransformer<I, O>) {\n  const controller: TransformStreamDefaultController<O> = Object.create(TransformStreamDefaultController.prototype);\n\n  let transformAlgorithm = (chunk: I): Promise<void> => {\n    try {\n      TransformStreamDefaultControllerEnqueue(controller, chunk as unknown as O);\n      return promiseResolvedWith(undefined);\n    } catch (transformResultE) {\n      return promiseRejectedWith(transformResultE);\n    }\n  };\n\n  let flushAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (transformer.transform !== undefined) {\n    transformAlgorithm = chunk => transformer.transform!(chunk, controller);\n  }\n  if (transformer.flush !== undefined) {\n    flushAlgorithm = () => transformer.flush!(controller);\n  }\n\n  SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);\n}\n\nfunction TransformStreamDefaultControllerClearAlgorithms(controller: TransformStreamDefaultController<any>) {\n  controller._transformAlgorithm = undefined!;\n  controller._flushAlgorithm = undefined!;\n}\n\nfunction TransformStreamDefaultControllerEnqueue<O>(controller: TransformStreamDefaultController<O>, chunk: O) {\n  const stream = controller._controlledTransformStream;\n  const readableController = stream._readable._readableStreamController as ReadableStreamDefaultController<O>;\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(readableController)) {\n    throw new TypeError('Readable side is not in a state that permits enqueue');\n  }\n\n  // We throttle transform invocations based on the backpressure of the ReadableStream, but we still\n  // accept TransformStreamDefaultControllerEnqueue() calls.\n\n  try {\n    ReadableStreamDefaultControllerEnqueue(readableController, chunk);\n  } catch (e) {\n    // This happens when readableStrategy.size() throws.\n    TransformStreamErrorWritableAndUnblockWrite(stream, e);\n\n    throw stream._readable._storedError;\n  }\n\n  const backpressure = ReadableStreamDefaultControllerHasBackpressure(readableController);\n  if (backpressure !== stream._backpressure) {\n    assert(backpressure);\n    TransformStreamSetBackpressure(stream, true);\n  }\n}\n\nfunction TransformStreamDefaultControllerError(controller: TransformStreamDefaultController<any>, e: any) {\n  TransformStreamError(controller._controlledTransformStream, e);\n}\n\nfunction TransformStreamDefaultControllerPerformTransform<I, O>(controller: TransformStreamDefaultController<O>,\n                                                                chunk: I) {\n  const transformPromise = controller._transformAlgorithm(chunk);\n  return transformPromiseWith(transformPromise, undefined, r => {\n    TransformStreamError(controller._controlledTransformStream, r);\n    throw r;\n  });\n}\n\nfunction TransformStreamDefaultControllerTerminate<O>(controller: TransformStreamDefaultController<O>) {\n  const stream = controller._controlledTransformStream;\n  const readableController = stream._readable._readableStreamController as ReadableStreamDefaultController<O>;\n\n  ReadableStreamDefaultControllerClose(readableController);\n\n  const error = new TypeError('TransformStream terminated');\n  TransformStreamErrorWritableAndUnblockWrite(stream, error);\n}\n\n// TransformStreamDefaultSink Algorithms\n\nfunction TransformStreamDefaultSinkWriteAlgorithm<I, O>(stream: TransformStream<I, O>, chunk: I): Promise<void> {\n  assert(stream._writable._state === 'writable');\n\n  const controller = stream._transformStreamController;\n\n  if (stream._backpressure) {\n    const backpressureChangePromise = stream._backpressureChangePromise;\n    assert(backpressureChangePromise !== undefined);\n    return transformPromiseWith(backpressureChangePromise, () => {\n      const writable = stream._writable;\n      const state = writable._state;\n      if (state === 'erroring') {\n        throw writable._storedError;\n      }\n      assert(state === 'writable');\n      return TransformStreamDefaultControllerPerformTransform<I, O>(controller, chunk);\n    });\n  }\n\n  return TransformStreamDefaultControllerPerformTransform<I, O>(controller, chunk);\n}\n\nfunction TransformStreamDefaultSinkAbortAlgorithm(stream: TransformStream, reason: any): Promise<void> {\n  // abort() is not called synchronously, so it is possible for abort() to be called when the stream is already\n  // errored.\n  TransformStreamError(stream, reason);\n  return promiseResolvedWith(undefined);\n}\n\nfunction TransformStreamDefaultSinkCloseAlgorithm<I, O>(stream: TransformStream<I, O>): Promise<void> {\n  // stream._readable cannot change after construction, so caching it across a call to user code is safe.\n  const readable = stream._readable;\n\n  const controller = stream._transformStreamController;\n  const flushPromise = controller._flushAlgorithm();\n  TransformStreamDefaultControllerClearAlgorithms(controller);\n\n  // Return a promise that is fulfilled with undefined on success.\n  return transformPromiseWith(flushPromise, () => {\n    if (readable._state === 'errored') {\n      throw readable._storedError;\n    }\n    ReadableStreamDefaultControllerClose(readable._readableStreamController as ReadableStreamDefaultController<O>);\n  }, r => {\n    TransformStreamError(stream, r);\n    throw readable._storedError;\n  });\n}\n\n// TransformStreamDefaultSource Algorithms\n\nfunction TransformStreamDefaultSourcePullAlgorithm(stream: TransformStream): Promise<void> {\n  // Invariant. Enforced by the promises returned by start() and pull().\n  assert(stream._backpressure);\n\n  assert(stream._backpressureChangePromise !== undefined);\n\n  TransformStreamSetBackpressure(stream, false);\n\n  // Prevent the next pull() call until there is backpressure.\n  return stream._backpressureChangePromise;\n}\n\n// Helper functions for the TransformStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `TransformStreamDefaultController.prototype.${name} can only be used on a TransformStreamDefaultController`);\n}\n\n// Helper functions for the TransformStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `TransformStream.prototype.${name} can only be used on a TransformStream`);\n}\n","import {\n  ByteLengthQueuingStrategy,\n  CountQueuingStrategy,\n  ReadableByteStreamController,\n  ReadableStream,\n  ReadableStreamBYOBReader,\n  ReadableStreamBYOBRequest,\n  ReadableStreamDefaultController,\n  ReadableStreamDefaultReader,\n  TransformStream,\n  TransformStreamDefaultController,\n  WritableStream,\n  WritableStreamDefaultController,\n  WritableStreamDefaultWriter\n} from './ponyfill';\nimport { globals } from './utils';\n\n// Export\nexport * from './ponyfill';\n\nconst exports = {\n  ReadableStream,\n  ReadableStreamDefaultController,\n  ReadableByteStreamController,\n  ReadableStreamBYOBRequest,\n  ReadableStreamDefaultReader,\n  ReadableStreamBYOBReader,\n\n  WritableStream,\n  WritableStreamDefaultController,\n  WritableStreamDefaultWriter,\n\n  ByteLengthQueuingStrategy,\n  CountQueuingStrategy,\n\n  TransformStream,\n  TransformStreamDefaultController\n};\n\n// Add classes to global scope\nif (typeof globals !== 'undefined') {\n  for (const prop in exports) {\n    if (Object.prototype.hasOwnProperty.call(exports, prop)) {\n      Object.defineProperty(globals, prop, {\n        value: exports[prop as (keyof 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diff --git a/node_modules/web-streams-polyfill/dist/polyfill.min.js b/node_modules/web-streams-polyfill/dist/polyfill.min.js
new file mode 100644
index 0000000..98a7694
--- /dev/null
+++ b/node_modules/web-streams-polyfill/dist/polyfill.min.js
@@ -0,0 +1,2 @@
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t=Ze(r,"Second parameter"),o=function(e,r){I(e,r);var t=null==e?void 0:e.abort,o=null==e?void 0:e.close,n=null==e?void 0:e.start,a=null==e?void 0:e.type,i=null==e?void 0:e.write;return{abort:void 0===t?void 0:er(t,e,r+" has member 'abort' that"),close:void 0===o?void 0:rr(o,e,r+" has member 'close' that"),start:void 0===n?void 0:tr(n,e,r+" has member 'start' that"),write:void 0===i?void 0:or(i,e,r+" has member 'write' that"),type:a}}(e,"First parameter");if(ur(this),void 0!==o.type)throw new RangeError("Invalid type is specified");var n=Ke(t);!function(e,r,t,o){var n=Object.create(qr.prototype),a=function(){},i=function(){return d(void 0)},l=function(){return d(void 0)},u=function(){return d(void 0)};void 0!==r.start&&(a=function(){return r.start(n)});void 0!==r.write&&(i=function(e){return r.write(e,n)});void 0!==r.close&&(l=function(){return r.close()});void 0!==r.abort&&(u=function(e){return r.abort(e)});Er(e,n,a,i,l,u,t,o)}(this,o,Je(t,1),n)}return Object.defineProperty(WritableStream.prototype,"locked",{get:function(){if(!sr(this))throw Dr("locked");return cr(this)},enumerable:!1,configurable:!0}),WritableStream.prototype.abort=function(e){return void 0===e&&(e=void 0),sr(this)?cr(this)?f(new TypeError("Cannot abort a stream that already has a writer")):dr(this,e):f(Dr("abort"))},WritableStream.prototype.close=function(){return sr(this)?cr(this)?f(new TypeError("Cannot close a stream that already has a writer")):hr(this)?f(new TypeError("Cannot close an already-closing stream")):fr(this):f(Dr("close"))},WritableStream.prototype.getWriter=function(){if(!sr(this))throw Dr("getWriter");return lr(this)},WritableStream}();function lr(e){return new vr(e)}function ur(e){e._state="writable",e._storedError=void 0,e._writer=void 0,e._writableStreamController=void 0,e._writeRequests=new w,e._inFlightWriteRequest=void 0,e._closeRequest=void 0,e._inFlightCloseRequest=void 0,e._pendingAbortRequest=void 0,e._backpressure=!1}function 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u=Ar(r);yr(e,u),p(d(t()),(function(){r._started=!0,Br(r)}),(function(t){r._started=!0,br(e,t)}))}function Wr(e){e._writeAlgorithm=void 0,e._closeAlgorithm=void 0,e._abortAlgorithm=void 0,e._strategySizeAlgorithm=void 0}function jr(e){return e._strategyHWM-e._queueTotalSize}function Br(e){var r=e._controlledWritableStream;if(e._started&&void 0===r._inFlightWriteRequest)if("erroring"!==r._state){if(0!==e._queue.length){var t=e._queue.peek().value;t===Pr?function(e){var r=e._controlledWritableStream;(function(e){e._inFlightCloseRequest=e._closeRequest,e._closeRequest=void 0})(r),fe(e);var t=e._closeAlgorithm();Wr(e),p(t,(function(){!function(e){e._inFlightCloseRequest._resolve(void 0),e._inFlightCloseRequest=void 0,"erroring"===e._state&&(e._storedError=void 0,void 0!==e._pendingAbortRequest&&(e._pendingAbortRequest._resolve(),e._pendingAbortRequest=void 0)),e._state="closed";var r=e._writer;void 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+//# sourceMappingURL=polyfill.min.js.map
diff --git a/node_modules/web-streams-polyfill/dist/polyfill.min.js.map b/node_modules/web-streams-polyfill/dist/polyfill.min.js.map
new file mode 100644
index 0000000..347ac89
--- /dev/null
+++ b/node_modules/web-streams-polyfill/dist/polyfill.min.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"polyfill.min.js","sources":["../src/stub/symbol.ts","../src/utils.ts","../src/lib/helpers/miscellaneous.ts","../src/lib/helpers/webidl.ts","../src/lib/simple-queue.ts","../src/lib/readable-stream/generic-reader.ts","../src/lib/abstract-ops/internal-methods.ts","../src/stub/number-isfinite.ts","../src/stub/math-trunc.ts","../src/lib/validators/basic.ts","../src/lib/validators/readable-stream.ts","../src/lib/readable-stream/default-reader.ts","../src/target/es5/stub/async-iterator-prototype.ts","../src/lib/readable-stream/async-iterator.ts","../src/stub/number-isnan.ts","../src/lib/abstract-ops/ecmascript.ts","../src/lib/abstract-ops/miscellaneous.ts","../src/lib/abstract-ops/queue-with-sizes.ts","../src/lib/readable-stream/byte-stream-controller.ts","../src/lib/readable-stream/byob-reader.ts","../src/lib/abstract-ops/queuing-strategy.ts","../src/lib/validators/queuing-strategy.ts","../src/lib/validators/underlying-sink.ts","../src/lib/validators/writable-stream.ts","../src/lib/abort-signal.ts","../src/lib/writable-stream.ts","../src/stub/native.ts","../src/stub/dom-exception.ts","../src/lib/readable-stream/pipe.ts","../src/lib/readable-stream/default-controller.ts","../src/lib/readable-stream/tee.ts","../src/lib/validators/underlying-source.ts","../src/lib/validators/reader-options.ts","../src/lib/validators/pipe-options.ts","../src/lib/readable-stream.ts","../src/lib/validators/readable-writable-pair.ts","../src/lib/validators/iterator-options.ts","../src/lib/validators/queuing-strategy-init.ts","../src/lib/byte-length-queuing-strategy.ts","../src/lib/count-queuing-strategy.ts","../src/lib/validators/transformer.ts","../src/lib/transform-stream.ts","../src/polyfill.ts"],"sourcesContent":["/// <reference lib=\"es2015.symbol\" />\n\nconst SymbolPolyfill: (description?: string) => symbol =\n  typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol' ?\n    Symbol :\n    description => `Symbol(${description})` as any as symbol;\n\nexport default SymbolPolyfill;\n","/// <reference lib=\"dom\" />\n\nexport function noop(): undefined {\n  return undefined;\n}\n\nfunction getGlobals() {\n  if (typeof self !== 'undefined') {\n    return self;\n  } else if (typeof window !== 'undefined') {\n    return window;\n  } else if (typeof global !== 'undefined') {\n    return global;\n  }\n  return undefined;\n}\n\nexport const globals = getGlobals();\n","import { noop } from '../../utils';\nimport { AssertionError } from '../../stub/assert';\n\nexport function typeIsObject(x: any): x is object {\n  return (typeof x === 'object' && x !== null) || typeof x === 'function';\n}\n\nexport const rethrowAssertionErrorRejection: (e: any) => void =\n  DEBUG ? e => {\n    // Used throughout the reference implementation, as `.catch(rethrowAssertionErrorRejection)`, to ensure any errors\n    // get shown. There are places in the spec where we do promise transformations and purposefully ignore or don't\n    // expect any errors, but assertion errors are always problematic.\n    if (e && e instanceof AssertionError) {\n      setTimeout(() => {\n        throw e;\n      }, 0);\n    }\n  } : noop;\n","import { globals } from '../../utils';\nimport { rethrowAssertionErrorRejection } from './miscellaneous';\nimport assert from '../../stub/assert';\n\nconst originalPromise = Promise;\nconst originalPromiseThen = Promise.prototype.then;\nconst originalPromiseResolve = Promise.resolve.bind(originalPromise);\nconst originalPromiseReject = Promise.reject.bind(originalPromise);\n\nexport function newPromise<T>(executor: (\n  resolve: (value: T | PromiseLike<T>) => void,\n  reject: (reason?: any) => void\n) => void): Promise<T> {\n  return new originalPromise(executor);\n}\n\nexport function promiseResolvedWith<T>(value: T | PromiseLike<T>): Promise<T> {\n  return originalPromiseResolve(value);\n}\n\nexport function promiseRejectedWith<T = never>(reason: any): Promise<T> {\n  return originalPromiseReject(reason);\n}\n\nexport function PerformPromiseThen<T, TResult1 = T, TResult2 = never>(\n  promise: Promise<T>,\n  onFulfilled?: (value: T) => TResult1 | PromiseLike<TResult1>,\n  onRejected?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2> {\n  // There doesn't appear to be any way to correctly emulate the behaviour from JavaScript, so this is just an\n  // approximation.\n  return originalPromiseThen.call(promise, onFulfilled, onRejected) as Promise<TResult1 | TResult2>;\n}\n\nexport function uponPromise<T>(\n  promise: Promise<T>,\n  onFulfilled?: (value: T) => void | PromiseLike<void>,\n  onRejected?: (reason: any) => void | PromiseLike<void>): void {\n  PerformPromiseThen(\n    PerformPromiseThen(promise, onFulfilled, onRejected),\n    undefined,\n    rethrowAssertionErrorRejection\n  );\n}\n\nexport function uponFulfillment<T>(promise: Promise<T>, onFulfilled: (value: T) => void | PromiseLike<void>): void {\n  uponPromise(promise, onFulfilled);\n}\n\nexport function uponRejection(promise: Promise<unknown>, onRejected: (reason: any) => void | PromiseLike<void>): void {\n  uponPromise(promise, undefined, onRejected);\n}\n\nexport function transformPromiseWith<T, TResult1 = T, TResult2 = never>(\n  promise: Promise<T>,\n  fulfillmentHandler?: (value: T) => TResult1 | PromiseLike<TResult1>,\n  rejectionHandler?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2> {\n  return PerformPromiseThen(promise, fulfillmentHandler, rejectionHandler);\n}\n\nexport function setPromiseIsHandledToTrue(promise: Promise<unknown>): void {\n  PerformPromiseThen(promise, undefined, rethrowAssertionErrorRejection);\n}\n\nexport const queueMicrotask: (fn: () => void) => void = (() => {\n  const globalQueueMicrotask = globals && globals.queueMicrotask;\n  if (typeof globalQueueMicrotask === 'function') {\n    return globalQueueMicrotask;\n  }\n\n  const resolvedPromise = promiseResolvedWith(undefined);\n  return (fn: () => void) => PerformPromiseThen(resolvedPromise, fn);\n})();\n\nexport function reflectCall<T, A extends any[], R>(F: (this: T, ...fnArgs: A) => R, V: T, args: A): R {\n  if (typeof F !== 'function') {\n    throw new TypeError('Argument is not a function');\n  }\n  return Function.prototype.apply.call(F, V, args);\n}\n\nexport function promiseCall<T, A extends any[], R>(F: (this: T, ...fnArgs: A) => R | PromiseLike<R>,\n                                                   V: T,\n                                                   args: A): Promise<R> {\n  assert(typeof F === 'function');\n  assert(V !== undefined);\n  assert(Array.isArray(args));\n  try {\n    return promiseResolvedWith(reflectCall(F, V, args));\n  } catch (value) {\n    return promiseRejectedWith(value);\n  }\n}\n","import assert from '../stub/assert';\n\n// Original from Chromium\n// https://chromium.googlesource.com/chromium/src/+/0aee4434a4dba42a42abaea9bfbc0cd196a63bc1/third_party/blink/renderer/core/streams/SimpleQueue.js\n\nconst QUEUE_MAX_ARRAY_SIZE = 16384;\n\ninterface Node<T> {\n  _elements: T[];\n  _next: Node<T> | undefined;\n}\n\n/**\n * Simple queue structure.\n *\n * Avoids scalability issues with using a packed array directly by using\n * multiple arrays in a linked list and keeping the array size bounded.\n */\nexport class SimpleQueue<T> {\n  private _front: Node<T>;\n  private _back: Node<T>;\n  private _cursor = 0;\n  private _size = 0;\n\n  constructor() {\n    // _front and _back are always defined.\n    this._front = {\n      _elements: [],\n      _next: undefined\n    };\n    this._back = this._front;\n    // The cursor is used to avoid calling Array.shift().\n    // It contains the index of the front element of the array inside the\n    // front-most node. It is always in the range [0, QUEUE_MAX_ARRAY_SIZE).\n    this._cursor = 0;\n    // When there is only one node, size === elements.length - cursor.\n    this._size = 0;\n  }\n\n  get length(): number {\n    return this._size;\n  }\n\n  // For exception safety, this method is structured in order:\n  // 1. Read state\n  // 2. Calculate required state mutations\n  // 3. Perform state mutations\n  push(element: T): void {\n    const oldBack = this._back;\n    let newBack = oldBack;\n    assert(oldBack._next === undefined);\n    if (oldBack._elements.length === QUEUE_MAX_ARRAY_SIZE - 1) {\n      newBack = {\n        _elements: [],\n        _next: undefined\n      };\n    }\n\n    // push() is the mutation most likely to throw an exception, so it\n    // goes first.\n    oldBack._elements.push(element);\n    if (newBack !== oldBack) {\n      this._back = newBack;\n      oldBack._next = newBack;\n    }\n    ++this._size;\n  }\n\n  // Like push(), shift() follows the read -> calculate -> mutate pattern for\n  // exception safety.\n  shift(): T {\n    assert(this._size > 0); // must not be called on an empty queue\n\n    const oldFront = this._front;\n    let newFront = oldFront;\n    const oldCursor = this._cursor;\n    let newCursor = oldCursor + 1;\n\n    const elements = oldFront._elements;\n    const element = elements[oldCursor];\n\n    if (newCursor === QUEUE_MAX_ARRAY_SIZE) {\n      assert(elements.length === QUEUE_MAX_ARRAY_SIZE);\n      assert(oldFront._next !== undefined);\n      newFront = oldFront._next!;\n      newCursor = 0;\n    }\n\n    // No mutations before this point.\n    --this._size;\n    this._cursor = newCursor;\n    if (oldFront !== newFront) {\n      this._front = newFront;\n    }\n\n    // Permit shifted element to be garbage collected.\n    elements[oldCursor] = undefined!;\n\n    return element;\n  }\n\n  // The tricky thing about forEach() is that it can be called\n  // re-entrantly. The queue may be mutated inside the callback. It is easy to\n  // see that push() within the callback has no negative effects since the end\n  // of the queue is checked for on every iteration. If shift() is called\n  // repeatedly within the callback then the next iteration may return an\n  // element that has been removed. In this case the callback will be called\n  // with undefined values until we either \"catch up\" with elements that still\n  // exist or reach the back of the queue.\n  forEach(callback: (element: T) => void): void {\n    let i = this._cursor;\n    let node = this._front;\n    let elements = node._elements;\n    while (i !== elements.length || node._next !== undefined) {\n      if (i === elements.length) {\n        assert(node._next !== undefined);\n        assert(i === QUEUE_MAX_ARRAY_SIZE);\n        node = node._next!;\n        elements = node._elements;\n        i = 0;\n        if (elements.length === 0) {\n          break;\n        }\n      }\n      callback(elements[i]);\n      ++i;\n    }\n  }\n\n  // Return the element that would be returned if shift() was called now,\n  // without modifying the queue.\n  peek(): T {\n    assert(this._size > 0); // must not be called on an empty queue\n\n    const front = this._front;\n    const cursor = this._cursor;\n    return front._elements[cursor];\n  }\n}\n","import assert from '../../stub/assert';\nimport { ReadableStream, ReadableStreamCancel, ReadableStreamReader } from '../readable-stream';\nimport { newPromise, setPromiseIsHandledToTrue } from '../helpers/webidl';\n\nexport function ReadableStreamReaderGenericInitialize<R>(reader: ReadableStreamReader<R>, stream: ReadableStream<R>) {\n  reader._ownerReadableStream = stream;\n  stream._reader = reader;\n\n  if (stream._state === 'readable') {\n    defaultReaderClosedPromiseInitialize(reader);\n  } else if (stream._state === 'closed') {\n    defaultReaderClosedPromiseInitializeAsResolved(reader);\n  } else {\n    assert(stream._state === 'errored');\n\n    defaultReaderClosedPromiseInitializeAsRejected(reader, stream._storedError);\n  }\n}\n\n// A client of ReadableStreamDefaultReader and ReadableStreamBYOBReader may use these functions directly to bypass state\n// check.\n\nexport function ReadableStreamReaderGenericCancel(reader: ReadableStreamReader<any>, reason: any): Promise<undefined> {\n  const stream = reader._ownerReadableStream;\n  assert(stream !== undefined);\n  return ReadableStreamCancel(stream, reason);\n}\n\nexport function ReadableStreamReaderGenericRelease(reader: ReadableStreamReader<any>) {\n  assert(reader._ownerReadableStream !== undefined);\n  assert(reader._ownerReadableStream._reader === reader);\n\n  if (reader._ownerReadableStream._state === 'readable') {\n    defaultReaderClosedPromiseReject(\n      reader,\n      new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));\n  } else {\n    defaultReaderClosedPromiseResetToRejected(\n      reader,\n      new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));\n  }\n\n  reader._ownerReadableStream._reader = undefined;\n  reader._ownerReadableStream = undefined!;\n}\n\n// Helper functions for the readers.\n\nexport function readerLockException(name: string): TypeError {\n  return new TypeError('Cannot ' + name + ' a stream using a released reader');\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nexport function defaultReaderClosedPromiseInitialize(reader: ReadableStreamReader<any>) {\n  reader._closedPromise = newPromise((resolve, reject) => {\n    reader._closedPromise_resolve = resolve;\n    reader._closedPromise_reject = reject;\n  });\n}\n\nexport function defaultReaderClosedPromiseInitializeAsRejected(reader: ReadableStreamReader<any>, reason: any) {\n  defaultReaderClosedPromiseInitialize(reader);\n  defaultReaderClosedPromiseReject(reader, reason);\n}\n\nexport function defaultReaderClosedPromiseInitializeAsResolved(reader: ReadableStreamReader<any>) {\n  defaultReaderClosedPromiseInitialize(reader);\n  defaultReaderClosedPromiseResolve(reader);\n}\n\nexport function defaultReaderClosedPromiseReject(reader: ReadableStreamReader<any>, reason: any) {\n  if (reader._closedPromise_reject === undefined) {\n    return;\n  }\n\n  setPromiseIsHandledToTrue(reader._closedPromise);\n  reader._closedPromise_reject(reason);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n\nexport function defaultReaderClosedPromiseResetToRejected(reader: ReadableStreamReader<any>, reason: any) {\n  assert(reader._closedPromise_resolve === undefined);\n  assert(reader._closedPromise_reject === undefined);\n\n  defaultReaderClosedPromiseInitializeAsRejected(reader, reason);\n}\n\nexport function defaultReaderClosedPromiseResolve(reader: ReadableStreamReader<any>) {\n  if (reader._closedPromise_resolve === undefined) {\n    return;\n  }\n\n  reader._closedPromise_resolve(undefined);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n","export const AbortSteps = Symbol('[[AbortSteps]]');\nexport const ErrorSteps = Symbol('[[ErrorSteps]]');\nexport const CancelSteps = Symbol('[[CancelSteps]]');\nexport const PullSteps = Symbol('[[PullSteps]]');\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite#Polyfill\nconst NumberIsFinite: typeof Number.isFinite = Number.isFinite || function (x) {\n  return typeof x === 'number' && isFinite(x);\n};\n\nexport default NumberIsFinite;\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc#Polyfill\nconst MathTrunc: typeof Math.trunc = Math.trunc || function (v) {\n  return v < 0 ? Math.ceil(v) : Math.floor(v);\n};\n\nexport default MathTrunc;\n","import NumberIsFinite from '../../stub/number-isfinite';\nimport MathTrunc from '../../stub/math-trunc';\n\n// https://heycam.github.io/webidl/#idl-dictionaries\nexport function isDictionary(x: any): x is object | null {\n  return typeof x === 'object' || typeof x === 'function';\n}\n\nexport function assertDictionary(obj: unknown,\n                                 context: string): asserts obj is object | null | undefined {\n  if (obj !== undefined && !isDictionary(obj)) {\n    throw new TypeError(`${context} is not an object.`);\n  }\n}\n\nexport type AnyFunction = (...args: any[]) => any;\n\n// https://heycam.github.io/webidl/#idl-callback-functions\nexport function assertFunction(x: unknown, context: string): asserts x is AnyFunction {\n  if (typeof x !== 'function') {\n    throw new TypeError(`${context} is not a function.`);\n  }\n}\n\n// https://heycam.github.io/webidl/#idl-object\nexport function isObject(x: any): x is object {\n  return (typeof x === 'object' && x !== null) || typeof x === 'function';\n}\n\nexport function assertObject(x: unknown,\n                             context: string): asserts x is object {\n  if (!isObject(x)) {\n    throw new TypeError(`${context} is not an object.`);\n  }\n}\n\nexport function assertRequiredArgument<T extends any>(x: T | undefined,\n                                                      position: number,\n                                                      context: string): asserts x is T {\n  if (x === undefined) {\n    throw new TypeError(`Parameter ${position} is required in '${context}'.`);\n  }\n}\n\nexport function assertRequiredField<T extends any>(x: T | undefined,\n                                                   field: string,\n                                                   context: string): asserts x is T {\n  if (x === undefined) {\n    throw new TypeError(`${field} is required in '${context}'.`);\n  }\n}\n\n// https://heycam.github.io/webidl/#idl-unrestricted-double\nexport function convertUnrestrictedDouble(value: unknown): number {\n  return Number(value);\n}\n\nfunction censorNegativeZero(x: number): number {\n  return x === 0 ? 0 : x;\n}\n\nfunction integerPart(x: number): number {\n  return censorNegativeZero(MathTrunc(x));\n}\n\n// https://heycam.github.io/webidl/#idl-unsigned-long-long\nexport function convertUnsignedLongLongWithEnforceRange(value: unknown, context: string): number {\n  const lowerBound = 0;\n  const upperBound = Number.MAX_SAFE_INTEGER;\n\n  let x = Number(value);\n  x = censorNegativeZero(x);\n\n  if (!NumberIsFinite(x)) {\n    throw new TypeError(`${context} is not a finite number`);\n  }\n\n  x = integerPart(x);\n\n  if (x < lowerBound || x > upperBound) {\n    throw new TypeError(`${context} is outside the accepted range of ${lowerBound} to ${upperBound}, inclusive`);\n  }\n\n  if (!NumberIsFinite(x) || x === 0) {\n    return 0;\n  }\n\n  // TODO Use BigInt if supported?\n  // let xBigInt = BigInt(integerPart(x));\n  // xBigInt = BigInt.asUintN(64, xBigInt);\n  // return Number(xBigInt);\n\n  return x;\n}\n","import { IsReadableStream, ReadableStream } from '../readable-stream';\n\nexport function assertReadableStream(x: unknown, context: string): asserts x is ReadableStream {\n  if (!IsReadableStream(x)) {\n    throw new TypeError(`${context} is not a ReadableStream.`);\n  }\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericInitialize,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport { IsReadableStreamLocked, ReadableStream } from '../readable-stream';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { PullSteps } from '../abstract-ops/internal-methods';\nimport { newPromise, promiseRejectedWith } from '../helpers/webidl';\nimport { assertRequiredArgument } from '../validators/basic';\nimport { assertReadableStream } from '../validators/readable-stream';\n\n/**\n * A result returned by {@link ReadableStreamDefaultReader.read}.\n *\n * @public\n */\nexport type ReadableStreamDefaultReadResult<T> = {\n  done: false;\n  value: T;\n} | {\n  done: true;\n  value?: undefined;\n}\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamDefaultReader<R>(stream: ReadableStream): ReadableStreamDefaultReader<R> {\n  return new ReadableStreamDefaultReader(stream);\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamAddReadRequest<R>(stream: ReadableStream<R>,\n                                                readRequest: ReadRequest<R>): void {\n  assert(IsReadableStreamDefaultReader(stream._reader));\n  assert(stream._state === 'readable');\n\n  (stream._reader! as ReadableStreamDefaultReader<R>)._readRequests.push(readRequest);\n}\n\nexport function ReadableStreamFulfillReadRequest<R>(stream: ReadableStream<R>, chunk: R | undefined, done: boolean) {\n  const reader = stream._reader as ReadableStreamDefaultReader<R>;\n\n  assert(reader._readRequests.length > 0);\n\n  const readRequest = reader._readRequests.shift()!;\n  if (done) {\n    readRequest._closeSteps();\n  } else {\n    readRequest._chunkSteps(chunk!);\n  }\n}\n\nexport function ReadableStreamGetNumReadRequests<R>(stream: ReadableStream<R>): number {\n  return (stream._reader as ReadableStreamDefaultReader<R>)._readRequests.length;\n}\n\nexport function ReadableStreamHasDefaultReader(stream: ReadableStream): boolean {\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return false;\n  }\n\n  if (!IsReadableStreamDefaultReader(reader)) {\n    return false;\n  }\n\n  return true;\n}\n\n// Readers\n\nexport interface ReadRequest<R> {\n  _chunkSteps(chunk: R): void;\n\n  _closeSteps(): void;\n\n  _errorSteps(e: any): void;\n}\n\n/**\n * A default reader vended by a {@link ReadableStream}.\n *\n * @public\n */\nexport class ReadableStreamDefaultReader<R = any> {\n  /** @internal */\n  _ownerReadableStream!: ReadableStream<R>;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readRequests: SimpleQueue<ReadRequest<R>>;\n\n  constructor(stream: ReadableStream<R>) {\n    assertRequiredArgument(stream, 1, 'ReadableStreamDefaultReader');\n    assertReadableStream(stream, 'First parameter');\n\n    if (IsReadableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n    }\n\n    ReadableStreamReaderGenericInitialize(this, stream);\n\n    this._readRequests = new SimpleQueue();\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed,\n   * or rejected if the stream ever errors or the reader's lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('cancel'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('cancel'));\n    }\n\n    return ReadableStreamReaderGenericCancel(this, reason);\n  }\n\n  /**\n   * Returns a promise that allows access to the next chunk from the stream's internal queue, if available.\n   *\n   * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.\n   */\n  read(): Promise<ReadableStreamDefaultReadResult<R>> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('read'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('read from'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamDefaultReadResult<R>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamDefaultReadResult<R>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),\n      _closeSteps: () => resolvePromise({ value: undefined, done: true }),\n      _errorSteps: e => rejectPromise(e)\n    };\n    ReadableStreamDefaultReaderRead(this, readRequest);\n    return promise;\n  }\n\n  /**\n   * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.\n   * If the associated stream is errored when the lock is released, the reader will appear errored in the same way\n   * from now on; otherwise, the reader will appear closed.\n   *\n   * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by\n   * the reader's {@link ReadableStreamDefaultReader.read | read()} method has not yet been settled. Attempting to\n   * do so will throw a `TypeError` and leave the reader locked to the stream.\n   */\n  releaseLock(): void {\n    if (!IsReadableStreamDefaultReader(this)) {\n      throw defaultReaderBrandCheckException('releaseLock');\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return;\n    }\n\n    if (this._readRequests.length > 0) {\n      throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n    }\n\n    ReadableStreamReaderGenericRelease(this);\n  }\n}\n\nObject.defineProperties(ReadableStreamDefaultReader.prototype, {\n  cancel: { enumerable: true },\n  read: { enumerable: true },\n  releaseLock: { enumerable: true },\n  closed: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamDefaultReader.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamDefaultReader',\n    configurable: true\n  });\n}\n\n// Abstract operations for the readers.\n\nexport function IsReadableStreamDefaultReader<R = any>(x: any): x is ReadableStreamDefaultReader<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readRequests')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamDefaultReader;\n}\n\nexport function ReadableStreamDefaultReaderRead<R>(reader: ReadableStreamDefaultReader<R>,\n                                                   readRequest: ReadRequest<R>): void {\n  const stream = reader._ownerReadableStream;\n\n  assert(stream !== undefined);\n\n  stream._disturbed = true;\n\n  if (stream._state === 'closed') {\n    readRequest._closeSteps();\n  } else if (stream._state === 'errored') {\n    readRequest._errorSteps(stream._storedError);\n  } else {\n    assert(stream._state === 'readable');\n    stream._readableStreamController[PullSteps](readRequest as ReadRequest<any>);\n  }\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nfunction defaultReaderBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamDefaultReader.prototype.${name} can only be used on a ReadableStreamDefaultReader`);\n}\n","/// <reference lib=\"es2018.asynciterable\" />\n\nexport let AsyncIteratorPrototype: AsyncIterable<any> | undefined;\n\nif (typeof Symbol.asyncIterator === 'symbol') {\n  // We're running inside a ES2018+ environment, but we're compiling to an older syntax.\n  // We cannot access %AsyncIteratorPrototype% without non-ES2018 syntax, but we can re-create it.\n  AsyncIteratorPrototype = {\n    // 25.1.3.1 %AsyncIteratorPrototype% [ @@asyncIterator ] ( )\n    // https://tc39.github.io/ecma262/#sec-asynciteratorprototype-asynciterator\n    [Symbol.asyncIterator](this: AsyncIterator<any>) {\n      return this;\n    }\n  };\n  Object.defineProperty(AsyncIteratorPrototype, Symbol.asyncIterator, { enumerable: false });\n}\n","/// <reference lib=\"es2018.asynciterable\" />\n\nimport { ReadableStream } from '../readable-stream';\nimport {\n  AcquireReadableStreamDefaultReader,\n  ReadableStreamDefaultReader,\n  ReadableStreamDefaultReaderRead,\n  ReadableStreamDefaultReadResult,\n  ReadRequest\n} from './default-reader';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport assert from '../../stub/assert';\nimport { AsyncIteratorPrototype } from '@@target/stub/async-iterator-prototype';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport {\n  newPromise,\n  promiseRejectedWith,\n  promiseResolvedWith,\n  queueMicrotask,\n  transformPromiseWith\n} from '../helpers/webidl';\n\n/**\n * An async iterator returned by {@link ReadableStream.values}.\n *\n * @public\n */\nexport interface ReadableStreamAsyncIterator<R> extends AsyncIterator<R> {\n  next(): Promise<IteratorResult<R, undefined>>;\n\n  return(value?: any): Promise<IteratorResult<any>>;\n}\n\nexport class ReadableStreamAsyncIteratorImpl<R> {\n  private readonly _reader: ReadableStreamDefaultReader<R>;\n  private readonly _preventCancel: boolean;\n  private _ongoingPromise: Promise<ReadableStreamDefaultReadResult<R>> | undefined = undefined;\n  private _isFinished = false;\n\n  constructor(reader: ReadableStreamDefaultReader<R>, preventCancel: boolean) {\n    this._reader = reader;\n    this._preventCancel = preventCancel;\n  }\n\n  next(): Promise<ReadableStreamDefaultReadResult<R>> {\n    const nextSteps = () => this._nextSteps();\n    this._ongoingPromise = this._ongoingPromise ?\n      transformPromiseWith(this._ongoingPromise, nextSteps, nextSteps) :\n      nextSteps();\n    return this._ongoingPromise;\n  }\n\n  return(value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    const returnSteps = () => this._returnSteps(value);\n    return this._ongoingPromise ?\n      transformPromiseWith(this._ongoingPromise, returnSteps, returnSteps) :\n      returnSteps();\n  }\n\n  private _nextSteps(): Promise<ReadableStreamDefaultReadResult<R>> {\n    if (this._isFinished) {\n      return Promise.resolve({ value: undefined, done: true });\n    }\n\n    const reader = this._reader;\n    if (reader._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('iterate'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamDefaultReadResult<R>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamDefaultReadResult<R>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => {\n        this._ongoingPromise = undefined;\n        // This needs to be delayed by one microtask, otherwise we stop pulling too early which breaks a test.\n        // FIXME Is this a bug in the specification, or in the test?\n        queueMicrotask(() => resolvePromise({ value: chunk, done: false }));\n      },\n      _closeSteps: () => {\n        this._ongoingPromise = undefined;\n        this._isFinished = true;\n        ReadableStreamReaderGenericRelease(reader);\n        resolvePromise({ value: undefined, done: true });\n      },\n      _errorSteps: reason => {\n        this._ongoingPromise = undefined;\n        this._isFinished = true;\n        ReadableStreamReaderGenericRelease(reader);\n        rejectPromise(reason);\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n    return promise;\n  }\n\n  private _returnSteps(value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (this._isFinished) {\n      return Promise.resolve({ value, done: true });\n    }\n    this._isFinished = true;\n\n    const reader = this._reader;\n    if (reader._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('finish iterating'));\n    }\n\n    assert(reader._readRequests.length === 0);\n\n    if (!this._preventCancel) {\n      const result = ReadableStreamReaderGenericCancel(reader, value);\n      ReadableStreamReaderGenericRelease(reader);\n      return transformPromiseWith(result, () => ({ value, done: true }));\n    }\n\n    ReadableStreamReaderGenericRelease(reader);\n    return promiseResolvedWith({ value, done: true });\n  }\n}\n\ndeclare class ReadableStreamAsyncIteratorInstance<R> implements ReadableStreamAsyncIterator<R> {\n  /** @interal */\n  _asyncIteratorImpl: ReadableStreamAsyncIteratorImpl<R>;\n\n  next(): Promise<IteratorResult<R, undefined>>;\n\n  return(value?: any): Promise<IteratorResult<any>>;\n}\n\nconst ReadableStreamAsyncIteratorPrototype: ReadableStreamAsyncIteratorInstance<any> = {\n  next(this: ReadableStreamAsyncIteratorInstance<any>): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (!IsReadableStreamAsyncIterator(this)) {\n      return promiseRejectedWith(streamAsyncIteratorBrandCheckException('next'));\n    }\n    return this._asyncIteratorImpl.next();\n  },\n\n  return(this: ReadableStreamAsyncIteratorInstance<any>, value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (!IsReadableStreamAsyncIterator(this)) {\n      return promiseRejectedWith(streamAsyncIteratorBrandCheckException('return'));\n    }\n    return this._asyncIteratorImpl.return(value);\n  }\n} as any;\nif (AsyncIteratorPrototype !== undefined) {\n  Object.setPrototypeOf(ReadableStreamAsyncIteratorPrototype, AsyncIteratorPrototype);\n}\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamAsyncIterator<R>(stream: ReadableStream<R>,\n                                                      preventCancel: boolean): ReadableStreamAsyncIterator<R> {\n  const reader = AcquireReadableStreamDefaultReader<R>(stream);\n  const impl = new ReadableStreamAsyncIteratorImpl(reader, preventCancel);\n  const iterator: ReadableStreamAsyncIteratorInstance<R> = Object.create(ReadableStreamAsyncIteratorPrototype);\n  iterator._asyncIteratorImpl = impl;\n  return iterator;\n}\n\nfunction IsReadableStreamAsyncIterator<R = any>(x: any): x is ReadableStreamAsyncIterator<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_asyncIteratorImpl')) {\n    return false;\n  }\n\n  try {\n    // noinspection SuspiciousTypeOfGuard\n    return (x as ReadableStreamAsyncIteratorInstance<any>)._asyncIteratorImpl instanceof\n      ReadableStreamAsyncIteratorImpl;\n  } catch {\n    return false;\n  }\n}\n\n// Helper functions for the ReadableStream.\n\nfunction streamAsyncIteratorBrandCheckException(name: string): TypeError {\n  return new TypeError(`ReadableStreamAsyncIterator.${name} can only be used on a ReadableSteamAsyncIterator`);\n}\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Polyfill\nconst NumberIsNaN: typeof Number.isNaN = Number.isNaN || function (x) {\n  // eslint-disable-next-line no-self-compare\n  return x !== x;\n};\n\nexport default NumberIsNaN;\n","export function CreateArrayFromList<T extends any[]>(elements: T): T {\n  // We use arrays to represent lists, so this is basically a no-op.\n  // Do a slice though just in case we happen to depend on the unique-ness.\n  return elements.slice() as T;\n}\n\nexport function CopyDataBlockBytes(dest: ArrayBuffer,\n                                   destOffset: number,\n                                   src: ArrayBuffer,\n                                   srcOffset: number,\n                                   n: number) {\n  new Uint8Array(dest).set(new Uint8Array(src, srcOffset, n), destOffset);\n}\n\n// Not implemented correctly\nexport function TransferArrayBuffer<T extends ArrayBufferLike>(O: T): T {\n  return O;\n}\n\n// Not implemented correctly\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nexport function CanTransferArrayBuffer(O: ArrayBufferLike): boolean {\n  return true;\n}\n\n// Not implemented correctly\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nexport function IsDetachedBuffer(O: ArrayBufferLike): boolean {\n  return false;\n}\n\nexport function ArrayBufferSlice(buffer: ArrayBufferLike, begin: number, end: number): ArrayBufferLike {\n  // ArrayBuffer.prototype.slice is not available on IE10\n  // https://www.caniuse.com/mdn-javascript_builtins_arraybuffer_slice\n  if (buffer.slice) {\n    return buffer.slice(begin, end);\n  }\n  const length = end - begin;\n  const slice = new ArrayBuffer(length);\n  CopyDataBlockBytes(slice, 0, buffer, begin, length);\n  return slice;\n}\n","import NumberIsNaN from '../../stub/number-isnan';\nimport { ArrayBufferSlice } from './ecmascript';\n\nexport function IsNonNegativeNumber(v: number): boolean {\n  if (typeof v !== 'number') {\n    return false;\n  }\n\n  if (NumberIsNaN(v)) {\n    return false;\n  }\n\n  if (v < 0) {\n    return false;\n  }\n\n  return true;\n}\n\nexport function CloneAsUint8Array(O: ArrayBufferView): Uint8Array {\n  const buffer = ArrayBufferSlice(O.buffer, O.byteOffset, O.byteOffset + O.byteLength);\n  return new Uint8Array(buffer);\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport { IsNonNegativeNumber } from './miscellaneous';\n\nexport interface QueueContainer<T> {\n  _queue: SimpleQueue<T>;\n  _queueTotalSize: number;\n}\n\nexport interface QueuePair<T> {\n  value: T;\n  size: number;\n}\n\nexport function DequeueValue<T>(container: QueueContainer<QueuePair<T>>): T {\n  assert('_queue' in container && '_queueTotalSize' in container);\n  assert(container._queue.length > 0);\n\n  const pair = container._queue.shift()!;\n  container._queueTotalSize -= pair.size;\n  if (container._queueTotalSize < 0) {\n    container._queueTotalSize = 0;\n  }\n\n  return pair.value;\n}\n\nexport function EnqueueValueWithSize<T>(container: QueueContainer<QueuePair<T>>, value: T, size: number) {\n  assert('_queue' in container && '_queueTotalSize' in container);\n\n  if (!IsNonNegativeNumber(size) || size === Infinity) {\n    throw new RangeError('Size must be a finite, non-NaN, non-negative number.');\n  }\n\n  container._queue.push({ value, size });\n  container._queueTotalSize += size;\n}\n\nexport function PeekQueueValue<T>(container: QueueContainer<QueuePair<T>>): T {\n  assert('_queue' in container && '_queueTotalSize' in container);\n  assert(container._queue.length > 0);\n\n  const pair = container._queue.peek();\n  return pair.value;\n}\n\nexport function ResetQueue<T>(container: QueueContainer<T>) {\n  assert('_queue' in container && '_queueTotalSize' in container);\n\n  container._queue = new SimpleQueue<T>();\n  container._queueTotalSize = 0;\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport { ResetQueue } from '../abstract-ops/queue-with-sizes';\nimport {\n  ReadableStreamAddReadRequest,\n  ReadableStreamFulfillReadRequest,\n  ReadableStreamGetNumReadRequests,\n  ReadableStreamHasDefaultReader,\n  ReadRequest\n} from './default-reader';\nimport {\n  ReadableStreamAddReadIntoRequest,\n  ReadableStreamFulfillReadIntoRequest,\n  ReadableStreamGetNumReadIntoRequests,\n  ReadableStreamHasBYOBReader,\n  ReadIntoRequest\n} from './byob-reader';\nimport NumberIsInteger from '../../stub/number-isinteger';\nimport {\n  IsReadableStreamLocked,\n  ReadableByteStream,\n  ReadableStreamClose,\n  ReadableStreamError\n} from '../readable-stream';\nimport { ValidatedUnderlyingByteSource } from './underlying-source';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport {\n  ArrayBufferSlice,\n  CanTransferArrayBuffer,\n  CopyDataBlockBytes,\n  IsDetachedBuffer,\n  TransferArrayBuffer\n} from '../abstract-ops/ecmascript';\nimport { CancelSteps, PullSteps } from '../abstract-ops/internal-methods';\nimport { promiseResolvedWith, uponPromise } from '../helpers/webidl';\nimport { assertRequiredArgument, convertUnsignedLongLongWithEnforceRange } from '../validators/basic';\n\n/**\n * A pull-into request in a {@link ReadableByteStreamController}.\n *\n * @public\n */\nexport class ReadableStreamBYOBRequest {\n  /** @internal */\n  _associatedReadableByteStreamController!: ReadableByteStreamController;\n  /** @internal */\n  _view!: ArrayBufferView | null;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the view for writing in to, or `null` if the BYOB request has already been responded to.\n   */\n  get view(): ArrayBufferView | null {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('view');\n    }\n\n    return this._view;\n  }\n\n  /**\n   * Indicates to the associated readable byte stream that `bytesWritten` bytes were written into\n   * {@link ReadableStreamBYOBRequest.view | view}, causing the result be surfaced to the consumer.\n   *\n   * After this method is called, {@link ReadableStreamBYOBRequest.view | view} will be transferred and no longer\n   * modifiable.\n   */\n  respond(bytesWritten: number): void;\n  respond(bytesWritten: number | undefined): void {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('respond');\n    }\n    assertRequiredArgument(bytesWritten, 1, 'respond');\n    bytesWritten = convertUnsignedLongLongWithEnforceRange(bytesWritten, 'First parameter');\n\n    if (this._associatedReadableByteStreamController === undefined) {\n      throw new TypeError('This BYOB request has been invalidated');\n    }\n\n    if (IsDetachedBuffer(this._view!.buffer)) {\n      throw new TypeError(`The BYOB request's buffer has been detached and so cannot be used as a response`);\n    }\n\n    assert(this._view!.byteLength > 0);\n    assert(this._view!.buffer.byteLength > 0);\n\n    ReadableByteStreamControllerRespond(this._associatedReadableByteStreamController, bytesWritten);\n  }\n\n  /**\n   * Indicates to the associated readable byte stream that instead of writing into\n   * {@link ReadableStreamBYOBRequest.view | view}, the underlying byte source is providing a new `ArrayBufferView`,\n   * which will be given to the consumer of the readable byte stream.\n   *\n   * After this method is called, `view` will be transferred and no longer modifiable.\n   */\n  respondWithNewView(view: ArrayBufferView): void;\n  respondWithNewView(view: ArrayBufferView | undefined): void {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('respondWithNewView');\n    }\n    assertRequiredArgument(view, 1, 'respondWithNewView');\n\n    if (!ArrayBuffer.isView(view)) {\n      throw new TypeError('You can only respond with array buffer views');\n    }\n\n    if (this._associatedReadableByteStreamController === undefined) {\n      throw new TypeError('This BYOB request has been invalidated');\n    }\n\n    if (IsDetachedBuffer(view.buffer)) {\n      throw new TypeError('The given view\\'s buffer has been detached and so cannot be used as a response');\n    }\n\n    ReadableByteStreamControllerRespondWithNewView(this._associatedReadableByteStreamController, view);\n  }\n}\n\nObject.defineProperties(ReadableStreamBYOBRequest.prototype, {\n  respond: { enumerable: true },\n  respondWithNewView: { enumerable: true },\n  view: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamBYOBRequest.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamBYOBRequest',\n    configurable: true\n  });\n}\n\ninterface ArrayBufferViewConstructor<T extends ArrayBufferView = ArrayBufferView> {\n  new(buffer: ArrayBufferLike, byteOffset: number, length?: number): T;\n\n  readonly prototype: T;\n  readonly BYTES_PER_ELEMENT: number;\n}\n\ninterface ByteQueueElement {\n  buffer: ArrayBufferLike;\n  byteOffset: number;\n  byteLength: number;\n}\n\ntype PullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> =\n  DefaultPullIntoDescriptor\n  | BYOBPullIntoDescriptor<T>;\n\ninterface DefaultPullIntoDescriptor {\n  buffer: ArrayBufferLike;\n  bufferByteLength: number;\n  byteOffset: number;\n  byteLength: number;\n  bytesFilled: number;\n  elementSize: number;\n  viewConstructor: ArrayBufferViewConstructor<Uint8Array>;\n  readerType: 'default';\n}\n\ninterface BYOBPullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> {\n  buffer: ArrayBufferLike;\n  bufferByteLength: number;\n  byteOffset: number;\n  byteLength: number;\n  bytesFilled: number;\n  elementSize: number;\n  viewConstructor: ArrayBufferViewConstructor<T>;\n  readerType: 'byob';\n}\n\n/**\n * Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue.\n *\n * @public\n */\nexport class ReadableByteStreamController {\n  /** @internal */\n  _controlledReadableByteStream!: ReadableByteStream;\n  /** @internal */\n  _queue!: SimpleQueue<ByteQueueElement>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _closeRequested!: boolean;\n  /** @internal */\n  _pullAgain!: boolean;\n  /** @internal */\n  _pulling !: boolean;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _pullAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _cancelAlgorithm!: (reason: any) => Promise<void>;\n  /** @internal */\n  _autoAllocateChunkSize: number | undefined;\n  /** @internal */\n  _byobRequest: ReadableStreamBYOBRequest | null;\n  /** @internal */\n  _pendingPullIntos!: SimpleQueue<PullIntoDescriptor>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the current BYOB pull request, or `null` if there isn't one.\n   */\n  get byobRequest(): ReadableStreamBYOBRequest | null {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('byobRequest');\n    }\n\n    return ReadableByteStreamControllerGetBYOBRequest(this);\n  }\n\n  /**\n   * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is\n   * over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure.\n   */\n  get desiredSize(): number | null {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('desiredSize');\n    }\n\n    return ReadableByteStreamControllerGetDesiredSize(this);\n  }\n\n  /**\n   * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from\n   * the stream, but once those are read, the stream will become closed.\n   */\n  close(): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('close');\n    }\n\n    if (this._closeRequested) {\n      throw new TypeError('The stream has already been closed; do not close it again!');\n    }\n\n    const state = this._controlledReadableByteStream._state;\n    if (state !== 'readable') {\n      throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be closed`);\n    }\n\n    ReadableByteStreamControllerClose(this);\n  }\n\n  /**\n   * Enqueues the given chunk chunk in the controlled readable stream.\n   * The chunk has to be an `ArrayBufferView` instance, or else a `TypeError` will be thrown.\n   */\n  enqueue(chunk: ArrayBufferView): void;\n  enqueue(chunk: ArrayBufferView | undefined): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('enqueue');\n    }\n\n    assertRequiredArgument(chunk, 1, 'enqueue');\n    if (!ArrayBuffer.isView(chunk)) {\n      throw new TypeError('chunk must be an array buffer view');\n    }\n    if (chunk.byteLength === 0) {\n      throw new TypeError('chunk must have non-zero byteLength');\n    }\n    if (chunk.buffer.byteLength === 0) {\n      throw new TypeError(`chunk's buffer must have non-zero byteLength`);\n    }\n\n    if (this._closeRequested) {\n      throw new TypeError('stream is closed or draining');\n    }\n\n    const state = this._controlledReadableByteStream._state;\n    if (state !== 'readable') {\n      throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be enqueued to`);\n    }\n\n    ReadableByteStreamControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.\n   */\n  error(e: any = undefined): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('error');\n    }\n\n    ReadableByteStreamControllerError(this, e);\n  }\n\n  /** @internal */\n  [CancelSteps](reason: any): Promise<void> {\n    ReadableByteStreamControllerClearPendingPullIntos(this);\n\n    ResetQueue(this);\n\n    const result = this._cancelAlgorithm(reason);\n    ReadableByteStreamControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [PullSteps](readRequest: ReadRequest<Uint8Array>): void {\n    const stream = this._controlledReadableByteStream;\n    assert(ReadableStreamHasDefaultReader(stream));\n\n    if (this._queueTotalSize > 0) {\n      assert(ReadableStreamGetNumReadRequests(stream) === 0);\n\n      const entry = this._queue.shift()!;\n      this._queueTotalSize -= entry.byteLength;\n\n      ReadableByteStreamControllerHandleQueueDrain(this);\n\n      const view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);\n\n      readRequest._chunkSteps(view);\n      return;\n    }\n\n    const autoAllocateChunkSize = this._autoAllocateChunkSize;\n    if (autoAllocateChunkSize !== undefined) {\n      let buffer: ArrayBuffer;\n      try {\n        buffer = new ArrayBuffer(autoAllocateChunkSize);\n      } catch (bufferE) {\n        readRequest._errorSteps(bufferE);\n        return;\n      }\n\n      const pullIntoDescriptor: DefaultPullIntoDescriptor = {\n        buffer,\n        bufferByteLength: autoAllocateChunkSize,\n        byteOffset: 0,\n        byteLength: autoAllocateChunkSize,\n        bytesFilled: 0,\n        elementSize: 1,\n        viewConstructor: Uint8Array,\n        readerType: 'default'\n      };\n\n      this._pendingPullIntos.push(pullIntoDescriptor);\n    }\n\n    ReadableStreamAddReadRequest(stream, readRequest);\n    ReadableByteStreamControllerCallPullIfNeeded(this);\n  }\n}\n\nObject.defineProperties(ReadableByteStreamController.prototype, {\n  close: { enumerable: true },\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  byobRequest: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableByteStreamController.prototype, Symbol.toStringTag, {\n    value: 'ReadableByteStreamController',\n    configurable: true\n  });\n}\n\n// Abstract operations for the ReadableByteStreamController.\n\nexport function IsReadableByteStreamController(x: any): x is ReadableByteStreamController {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableByteStream')) {\n    return false;\n  }\n\n  return x instanceof ReadableByteStreamController;\n}\n\nfunction IsReadableStreamBYOBRequest(x: any): x is ReadableStreamBYOBRequest {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_associatedReadableByteStreamController')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamBYOBRequest;\n}\n\nfunction ReadableByteStreamControllerCallPullIfNeeded(controller: ReadableByteStreamController): void {\n  const shouldPull = ReadableByteStreamControllerShouldCallPull(controller);\n  if (!shouldPull) {\n    return;\n  }\n\n  if (controller._pulling) {\n    controller._pullAgain = true;\n    return;\n  }\n\n  assert(!controller._pullAgain);\n\n  controller._pulling = true;\n\n  // TODO: Test controller argument\n  const pullPromise = controller._pullAlgorithm();\n  uponPromise(\n    pullPromise,\n    () => {\n      controller._pulling = false;\n\n      if (controller._pullAgain) {\n        controller._pullAgain = false;\n        ReadableByteStreamControllerCallPullIfNeeded(controller);\n      }\n    },\n    e => {\n      ReadableByteStreamControllerError(controller, e);\n    }\n  );\n}\n\nfunction ReadableByteStreamControllerClearPendingPullIntos(controller: ReadableByteStreamController) {\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n  controller._pendingPullIntos = new SimpleQueue();\n}\n\nfunction ReadableByteStreamControllerCommitPullIntoDescriptor<T extends ArrayBufferView>(\n  stream: ReadableByteStream,\n  pullIntoDescriptor: PullIntoDescriptor<T>\n) {\n  assert(stream._state !== 'errored');\n\n  let done = false;\n  if (stream._state === 'closed') {\n    assert(pullIntoDescriptor.bytesFilled === 0);\n    done = true;\n  }\n\n  const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);\n  if (pullIntoDescriptor.readerType === 'default') {\n    ReadableStreamFulfillReadRequest(stream, filledView as unknown as Uint8Array, done);\n  } else {\n    assert(pullIntoDescriptor.readerType === 'byob');\n    ReadableStreamFulfillReadIntoRequest(stream, filledView, done);\n  }\n}\n\nfunction ReadableByteStreamControllerConvertPullIntoDescriptor<T extends ArrayBufferView>(\n  pullIntoDescriptor: PullIntoDescriptor<T>\n): T {\n  const bytesFilled = pullIntoDescriptor.bytesFilled;\n  const elementSize = pullIntoDescriptor.elementSize;\n\n  assert(bytesFilled <= pullIntoDescriptor.byteLength);\n  assert(bytesFilled % elementSize === 0);\n\n  return new pullIntoDescriptor.viewConstructor(\n    pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize) as T;\n}\n\nfunction ReadableByteStreamControllerEnqueueChunkToQueue(controller: ReadableByteStreamController,\n                                                         buffer: ArrayBufferLike,\n                                                         byteOffset: number,\n                                                         byteLength: number) {\n  controller._queue.push({ buffer, byteOffset, byteLength });\n  controller._queueTotalSize += byteLength;\n}\n\nfunction ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller: ReadableByteStreamController,\n                                                                     pullIntoDescriptor: PullIntoDescriptor) {\n  const elementSize = pullIntoDescriptor.elementSize;\n\n  const currentAlignedBytes = pullIntoDescriptor.bytesFilled - pullIntoDescriptor.bytesFilled % elementSize;\n\n  const maxBytesToCopy = Math.min(controller._queueTotalSize,\n                                  pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled);\n  const maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;\n  const maxAlignedBytes = maxBytesFilled - maxBytesFilled % elementSize;\n\n  let totalBytesToCopyRemaining = maxBytesToCopy;\n  let ready = false;\n  if (maxAlignedBytes > currentAlignedBytes) {\n    totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled;\n    ready = true;\n  }\n\n  const queue = controller._queue;\n\n  while (totalBytesToCopyRemaining > 0) {\n    const headOfQueue = queue.peek();\n\n    const bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength);\n\n    const destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n    CopyDataBlockBytes(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy);\n\n    if (headOfQueue.byteLength === bytesToCopy) {\n      queue.shift();\n    } else {\n      headOfQueue.byteOffset += bytesToCopy;\n      headOfQueue.byteLength -= bytesToCopy;\n    }\n    controller._queueTotalSize -= bytesToCopy;\n\n    ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor);\n\n    totalBytesToCopyRemaining -= bytesToCopy;\n  }\n\n  if (!ready) {\n    assert(controller._queueTotalSize === 0);\n    assert(pullIntoDescriptor.bytesFilled > 0);\n    assert(pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize);\n  }\n\n  return ready;\n}\n\nfunction ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller: ReadableByteStreamController,\n                                                                size: number,\n                                                                pullIntoDescriptor: PullIntoDescriptor) {\n  assert(controller._pendingPullIntos.length === 0 || controller._pendingPullIntos.peek() === pullIntoDescriptor);\n  assert(controller._byobRequest === null);\n  pullIntoDescriptor.bytesFilled += size;\n}\n\nfunction ReadableByteStreamControllerHandleQueueDrain(controller: ReadableByteStreamController) {\n  assert(controller._controlledReadableByteStream._state === 'readable');\n\n  if (controller._queueTotalSize === 0 && controller._closeRequested) {\n    ReadableByteStreamControllerClearAlgorithms(controller);\n    ReadableStreamClose(controller._controlledReadableByteStream);\n  } else {\n    ReadableByteStreamControllerCallPullIfNeeded(controller);\n  }\n}\n\nfunction ReadableByteStreamControllerInvalidateBYOBRequest(controller: ReadableByteStreamController) {\n  if (controller._byobRequest === null) {\n    return;\n  }\n\n  controller._byobRequest._associatedReadableByteStreamController = undefined!;\n  controller._byobRequest._view = null!;\n  controller._byobRequest = null;\n}\n\nfunction ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller: ReadableByteStreamController) {\n  assert(!controller._closeRequested);\n\n  while (controller._pendingPullIntos.length > 0) {\n    if (controller._queueTotalSize === 0) {\n      return;\n    }\n\n    const pullIntoDescriptor = controller._pendingPullIntos.peek();\n\n    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {\n      ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n      ReadableByteStreamControllerCommitPullIntoDescriptor(\n        controller._controlledReadableByteStream,\n        pullIntoDescriptor\n      );\n    }\n  }\n}\n\nexport function ReadableByteStreamControllerPullInto<T extends ArrayBufferView>(\n  controller: ReadableByteStreamController,\n  view: T,\n  readIntoRequest: ReadIntoRequest<T>\n): void {\n  const stream = controller._controlledReadableByteStream;\n\n  let elementSize = 1;\n  if (view.constructor !== DataView) {\n    elementSize = (view.constructor as ArrayBufferViewConstructor<T>).BYTES_PER_ELEMENT;\n  }\n\n  const ctor = view.constructor as ArrayBufferViewConstructor<T>;\n\n  // try {\n  const buffer = TransferArrayBuffer(view.buffer);\n  // } catch (e) {\n  //   readIntoRequest._errorSteps(e);\n  //   return;\n  // }\n\n  const pullIntoDescriptor: BYOBPullIntoDescriptor<T> = {\n    buffer,\n    bufferByteLength: buffer.byteLength,\n    byteOffset: view.byteOffset,\n    byteLength: view.byteLength,\n    bytesFilled: 0,\n    elementSize,\n    viewConstructor: ctor,\n    readerType: 'byob'\n  };\n\n  if (controller._pendingPullIntos.length > 0) {\n    controller._pendingPullIntos.push(pullIntoDescriptor);\n\n    // No ReadableByteStreamControllerCallPullIfNeeded() call since:\n    // - No change happens on desiredSize\n    // - The source has already been notified of that there's at least 1 pending read(view)\n\n    ReadableStreamAddReadIntoRequest(stream, readIntoRequest);\n    return;\n  }\n\n  if (stream._state === 'closed') {\n    const emptyView = new ctor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0);\n    readIntoRequest._closeSteps(emptyView);\n    return;\n  }\n\n  if (controller._queueTotalSize > 0) {\n    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {\n      const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);\n\n      ReadableByteStreamControllerHandleQueueDrain(controller);\n\n      readIntoRequest._chunkSteps(filledView);\n      return;\n    }\n\n    if (controller._closeRequested) {\n      const e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n      ReadableByteStreamControllerError(controller, e);\n\n      readIntoRequest._errorSteps(e);\n      return;\n    }\n  }\n\n  controller._pendingPullIntos.push(pullIntoDescriptor);\n\n  ReadableStreamAddReadIntoRequest<T>(stream, readIntoRequest);\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nfunction ReadableByteStreamControllerRespondInClosedState(controller: ReadableByteStreamController,\n                                                          firstDescriptor: PullIntoDescriptor) {\n  assert(firstDescriptor.bytesFilled === 0);\n\n  const stream = controller._controlledReadableByteStream;\n  if (ReadableStreamHasBYOBReader(stream)) {\n    while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n      const pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);\n      ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);\n    }\n  }\n}\n\nfunction ReadableByteStreamControllerRespondInReadableState(controller: ReadableByteStreamController,\n                                                            bytesWritten: number,\n                                                            pullIntoDescriptor: PullIntoDescriptor) {\n  assert(pullIntoDescriptor.bytesFilled + bytesWritten <= pullIntoDescriptor.byteLength);\n\n  ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor);\n\n  if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {\n    return;\n  }\n\n  ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n  const remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize;\n  if (remainderSize > 0) {\n    const end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n    const remainder = ArrayBufferSlice(pullIntoDescriptor.buffer, end - remainderSize, end);\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength);\n  }\n\n  pullIntoDescriptor.bytesFilled -= remainderSize;\n  ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);\n\n  ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n}\n\nfunction ReadableByteStreamControllerRespondInternal(controller: ReadableByteStreamController, bytesWritten: number) {\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  assert(CanTransferArrayBuffer(firstDescriptor.buffer));\n\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n\n  const state = controller._controlledReadableByteStream._state;\n  if (state === 'closed') {\n    assert(bytesWritten === 0);\n    ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor);\n  } else {\n    assert(state === 'readable');\n    assert(bytesWritten > 0);\n    ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);\n  }\n\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nfunction ReadableByteStreamControllerShiftPendingPullInto(\n  controller: ReadableByteStreamController\n): PullIntoDescriptor {\n  assert(controller._byobRequest === null);\n  const descriptor = controller._pendingPullIntos.shift()!;\n  return descriptor;\n}\n\nfunction ReadableByteStreamControllerShouldCallPull(controller: ReadableByteStreamController): boolean {\n  const stream = controller._controlledReadableByteStream;\n\n  if (stream._state !== 'readable') {\n    return false;\n  }\n\n  if (controller._closeRequested) {\n    return false;\n  }\n\n  if (!controller._started) {\n    return false;\n  }\n\n  if (ReadableStreamHasDefaultReader(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    return true;\n  }\n\n  if (ReadableStreamHasBYOBReader(stream) && ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n    return true;\n  }\n\n  const desiredSize = ReadableByteStreamControllerGetDesiredSize(controller);\n  assert(desiredSize !== null);\n  if (desiredSize! > 0) {\n    return true;\n  }\n\n  return false;\n}\n\nfunction ReadableByteStreamControllerClearAlgorithms(controller: ReadableByteStreamController) {\n  controller._pullAlgorithm = undefined!;\n  controller._cancelAlgorithm = undefined!;\n}\n\n// A client of ReadableByteStreamController may use these functions directly to bypass state check.\n\nexport function ReadableByteStreamControllerClose(controller: ReadableByteStreamController) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (controller._closeRequested || stream._state !== 'readable') {\n    return;\n  }\n\n  if (controller._queueTotalSize > 0) {\n    controller._closeRequested = true;\n\n    return;\n  }\n\n  if (controller._pendingPullIntos.length > 0) {\n    const firstPendingPullInto = controller._pendingPullIntos.peek();\n    if (firstPendingPullInto.bytesFilled > 0) {\n      const e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n      ReadableByteStreamControllerError(controller, e);\n\n      throw e;\n    }\n  }\n\n  ReadableByteStreamControllerClearAlgorithms(controller);\n  ReadableStreamClose(stream);\n}\n\nexport function ReadableByteStreamControllerEnqueue(controller: ReadableByteStreamController, chunk: ArrayBufferView) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (controller._closeRequested || stream._state !== 'readable') {\n    return;\n  }\n\n  const buffer = chunk.buffer;\n  const byteOffset = chunk.byteOffset;\n  const byteLength = chunk.byteLength;\n  if (IsDetachedBuffer(buffer)) {\n    throw new TypeError('chunk\\'s buffer is detached and so cannot be enqueued');\n  }\n  const transferredBuffer = TransferArrayBuffer(buffer);\n\n  if (controller._pendingPullIntos.length > 0) {\n    const firstPendingPullInto = controller._pendingPullIntos.peek();\n    if (IsDetachedBuffer(firstPendingPullInto.buffer)) {\n      throw new TypeError(\n        'The BYOB request\\'s buffer has been detached and so cannot be filled with an enqueued chunk'\n      );\n    }\n    firstPendingPullInto.buffer = TransferArrayBuffer(firstPendingPullInto.buffer);\n  }\n\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n\n  if (ReadableStreamHasDefaultReader(stream)) {\n    if (ReadableStreamGetNumReadRequests(stream) === 0) {\n      assert(controller._pendingPullIntos.length === 0);\n      ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n    } else {\n      assert(controller._queue.length === 0);\n      if (controller._pendingPullIntos.length > 0) {\n        assert(controller._pendingPullIntos.peek().readerType === 'default');\n        ReadableByteStreamControllerShiftPendingPullInto(controller);\n      }\n      const transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength);\n      ReadableStreamFulfillReadRequest(stream, transferredView, false);\n    }\n  } else if (ReadableStreamHasBYOBReader(stream)) {\n    // TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully.\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n    ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n  } else {\n    assert(!IsReadableStreamLocked(stream));\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n  }\n\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nexport function ReadableByteStreamControllerError(controller: ReadableByteStreamController, e: any) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (stream._state !== 'readable') {\n    return;\n  }\n\n  ReadableByteStreamControllerClearPendingPullIntos(controller);\n\n  ResetQueue(controller);\n  ReadableByteStreamControllerClearAlgorithms(controller);\n  ReadableStreamError(stream, e);\n}\n\nexport function ReadableByteStreamControllerGetBYOBRequest(\n  controller: ReadableByteStreamController\n): ReadableStreamBYOBRequest | null {\n  if (controller._byobRequest === null && controller._pendingPullIntos.length > 0) {\n    const firstDescriptor = controller._pendingPullIntos.peek();\n    const view = new Uint8Array(firstDescriptor.buffer,\n                                firstDescriptor.byteOffset + firstDescriptor.bytesFilled,\n                                firstDescriptor.byteLength - firstDescriptor.bytesFilled);\n\n    const byobRequest: ReadableStreamBYOBRequest = Object.create(ReadableStreamBYOBRequest.prototype);\n    SetUpReadableStreamBYOBRequest(byobRequest, controller, view);\n    controller._byobRequest = byobRequest;\n  }\n  return controller._byobRequest;\n}\n\nfunction ReadableByteStreamControllerGetDesiredSize(controller: ReadableByteStreamController): number | null {\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'errored') {\n    return null;\n  }\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\nexport function ReadableByteStreamControllerRespond(controller: ReadableByteStreamController, bytesWritten: number) {\n  assert(controller._pendingPullIntos.length > 0);\n\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'closed') {\n    if (bytesWritten !== 0) {\n      throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream');\n    }\n  } else {\n    assert(state === 'readable');\n    if (bytesWritten === 0) {\n      throw new TypeError('bytesWritten must be greater than 0 when calling respond() on a readable stream');\n    }\n    if (firstDescriptor.bytesFilled + bytesWritten > firstDescriptor.byteLength) {\n      throw new RangeError('bytesWritten out of range');\n    }\n  }\n\n  firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer);\n\n  ReadableByteStreamControllerRespondInternal(controller, bytesWritten);\n}\n\nexport function ReadableByteStreamControllerRespondWithNewView(controller: ReadableByteStreamController,\n                                                               view: ArrayBufferView) {\n  assert(controller._pendingPullIntos.length > 0);\n  assert(!IsDetachedBuffer(view.buffer));\n\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'closed') {\n    if (view.byteLength !== 0) {\n      throw new TypeError('The view\\'s length must be 0 when calling respondWithNewView() on a closed stream');\n    }\n  } else {\n    assert(state === 'readable');\n    if (view.byteLength === 0) {\n      throw new TypeError(\n        'The view\\'s length must be greater than 0 when calling respondWithNewView() on a readable stream'\n      );\n    }\n  }\n\n  if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) {\n    throw new RangeError('The region specified by view does not match byobRequest');\n  }\n  if (firstDescriptor.bufferByteLength !== view.buffer.byteLength) {\n    throw new RangeError('The buffer of view has different capacity than byobRequest');\n  }\n  if (firstDescriptor.bytesFilled + view.byteLength > firstDescriptor.byteLength) {\n    throw new RangeError('The region specified by view is larger than byobRequest');\n  }\n\n  const viewByteLength = view.byteLength;\n  firstDescriptor.buffer = TransferArrayBuffer(view.buffer);\n  ReadableByteStreamControllerRespondInternal(controller, viewByteLength);\n}\n\nexport function SetUpReadableByteStreamController(stream: ReadableByteStream,\n                                                  controller: ReadableByteStreamController,\n                                                  startAlgorithm: () => void | PromiseLike<void>,\n                                                  pullAlgorithm: () => Promise<void>,\n                                                  cancelAlgorithm: (reason: any) => Promise<void>,\n                                                  highWaterMark: number,\n                                                  autoAllocateChunkSize: number | undefined) {\n  assert(stream._readableStreamController === undefined);\n  if (autoAllocateChunkSize !== undefined) {\n    assert(NumberIsInteger(autoAllocateChunkSize));\n    assert(autoAllocateChunkSize > 0);\n  }\n\n  controller._controlledReadableByteStream = stream;\n\n  controller._pullAgain = false;\n  controller._pulling = false;\n\n  controller._byobRequest = null;\n\n  // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n  controller._queue = controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._closeRequested = false;\n  controller._started = false;\n\n  controller._strategyHWM = highWaterMark;\n\n  controller._pullAlgorithm = pullAlgorithm;\n  controller._cancelAlgorithm = cancelAlgorithm;\n\n  controller._autoAllocateChunkSize = autoAllocateChunkSize;\n\n  controller._pendingPullIntos = new SimpleQueue();\n\n  stream._readableStreamController = controller;\n\n  const startResult = startAlgorithm();\n  uponPromise(\n    promiseResolvedWith(startResult),\n    () => {\n      controller._started = true;\n\n      assert(!controller._pulling);\n      assert(!controller._pullAgain);\n\n      ReadableByteStreamControllerCallPullIfNeeded(controller);\n    },\n    r => {\n      ReadableByteStreamControllerError(controller, r);\n    }\n  );\n}\n\nexport function SetUpReadableByteStreamControllerFromUnderlyingSource(\n  stream: ReadableByteStream,\n  underlyingByteSource: ValidatedUnderlyingByteSource,\n  highWaterMark: number\n) {\n  const controller: ReadableByteStreamController = Object.create(ReadableByteStreamController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let pullAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let cancelAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingByteSource.start !== undefined) {\n    startAlgorithm = () => underlyingByteSource.start!(controller);\n  }\n  if (underlyingByteSource.pull !== undefined) {\n    pullAlgorithm = () => underlyingByteSource.pull!(controller);\n  }\n  if (underlyingByteSource.cancel !== undefined) {\n    cancelAlgorithm = reason => underlyingByteSource.cancel!(reason);\n  }\n\n  const autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;\n  if (autoAllocateChunkSize === 0) {\n    throw new TypeError('autoAllocateChunkSize must be greater than 0');\n  }\n\n  SetUpReadableByteStreamController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize\n  );\n}\n\nfunction SetUpReadableStreamBYOBRequest(request: ReadableStreamBYOBRequest,\n                                        controller: ReadableByteStreamController,\n                                        view: ArrayBufferView) {\n  assert(IsReadableByteStreamController(controller));\n  assert(typeof view === 'object');\n  assert(ArrayBuffer.isView(view));\n  assert(!IsDetachedBuffer(view.buffer));\n  request._associatedReadableByteStreamController = controller;\n  request._view = view;\n}\n\n// Helper functions for the ReadableStreamBYOBRequest.\n\nfunction byobRequestBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamBYOBRequest.prototype.${name} can only be used on a ReadableStreamBYOBRequest`);\n}\n\n// Helper functions for the ReadableByteStreamController.\n\nfunction byteStreamControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableByteStreamController.prototype.${name} can only be used on a ReadableByteStreamController`);\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericInitialize,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport { IsReadableStreamLocked, ReadableByteStream, ReadableStream } from '../readable-stream';\nimport {\n  IsReadableByteStreamController,\n  ReadableByteStreamController,\n  ReadableByteStreamControllerPullInto\n} from './byte-stream-controller';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { newPromise, promiseRejectedWith } from '../helpers/webidl';\nimport { assertRequiredArgument } from '../validators/basic';\nimport { assertReadableStream } from '../validators/readable-stream';\nimport { IsDetachedBuffer } from '../abstract-ops/ecmascript';\n\n/**\n * A result returned by {@link ReadableStreamBYOBReader.read}.\n *\n * @public\n */\nexport type ReadableStreamBYOBReadResult<T extends ArrayBufferView> = {\n  done: false;\n  value: T;\n} | {\n  done: true;\n  value: T | undefined;\n};\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamBYOBReader(stream: ReadableByteStream): ReadableStreamBYOBReader {\n  return new ReadableStreamBYOBReader(stream);\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamAddReadIntoRequest<T extends ArrayBufferView>(stream: ReadableByteStream,\n                                                                            readIntoRequest: ReadIntoRequest<T>): void {\n  assert(IsReadableStreamBYOBReader(stream._reader));\n  assert(stream._state === 'readable' || stream._state === 'closed');\n\n  (stream._reader! as ReadableStreamBYOBReader)._readIntoRequests.push(readIntoRequest);\n}\n\nexport function ReadableStreamFulfillReadIntoRequest(stream: ReadableByteStream,\n                                                     chunk: ArrayBufferView,\n                                                     done: boolean) {\n  const reader = stream._reader as ReadableStreamBYOBReader;\n\n  assert(reader._readIntoRequests.length > 0);\n\n  const readIntoRequest = reader._readIntoRequests.shift()!;\n  if (done) {\n    readIntoRequest._closeSteps(chunk);\n  } else {\n    readIntoRequest._chunkSteps(chunk);\n  }\n}\n\nexport function ReadableStreamGetNumReadIntoRequests(stream: ReadableByteStream): number {\n  return (stream._reader as ReadableStreamBYOBReader)._readIntoRequests.length;\n}\n\nexport function ReadableStreamHasBYOBReader(stream: ReadableByteStream): boolean {\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return false;\n  }\n\n  if (!IsReadableStreamBYOBReader(reader)) {\n    return false;\n  }\n\n  return true;\n}\n\n// Readers\n\nexport interface ReadIntoRequest<T extends ArrayBufferView> {\n  _chunkSteps(chunk: T): void;\n\n  _closeSteps(chunk: T | undefined): void;\n\n  _errorSteps(e: any): void;\n}\n\n/**\n * A BYOB reader vended by a {@link ReadableStream}.\n *\n * @public\n */\nexport class ReadableStreamBYOBReader {\n  /** @internal */\n  _ownerReadableStream!: ReadableByteStream;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readIntoRequests: SimpleQueue<ReadIntoRequest<any>>;\n\n  constructor(stream: ReadableByteStream) {\n    assertRequiredArgument(stream, 1, 'ReadableStreamBYOBReader');\n    assertReadableStream(stream, 'First parameter');\n\n    if (IsReadableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n    }\n\n    if (!IsReadableByteStreamController(stream._readableStreamController)) {\n      throw new TypeError('Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte ' +\n        'source');\n    }\n\n    ReadableStreamReaderGenericInitialize(this, stream);\n\n    this._readIntoRequests = new SimpleQueue();\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or\n   * the reader's lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('cancel'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('cancel'));\n    }\n\n    return ReadableStreamReaderGenericCancel(this, reason);\n  }\n\n  /**\n   * Attempts to reads bytes into view, and returns a promise resolved with the result.\n   *\n   * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.\n   */\n  read<T extends ArrayBufferView>(view: T): Promise<ReadableStreamBYOBReadResult<T>> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('read'));\n    }\n\n    if (!ArrayBuffer.isView(view)) {\n      return promiseRejectedWith(new TypeError('view must be an array buffer view'));\n    }\n    if (view.byteLength === 0) {\n      return promiseRejectedWith(new TypeError('view must have non-zero byteLength'));\n    }\n    if (view.buffer.byteLength === 0) {\n      return promiseRejectedWith(new TypeError(`view's buffer must have non-zero byteLength`));\n    }\n    if (IsDetachedBuffer(view.buffer)) {\n      return promiseRejectedWith(new TypeError('view\\'s buffer has been detached'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('read from'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamBYOBReadResult<T>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamBYOBReadResult<T>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readIntoRequest: ReadIntoRequest<T> = {\n      _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),\n      _closeSteps: chunk => resolvePromise({ value: chunk, done: true }),\n      _errorSteps: e => rejectPromise(e)\n    };\n    ReadableStreamBYOBReaderRead(this, view, readIntoRequest);\n    return promise;\n  }\n\n  /**\n   * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.\n   * If the associated stream is errored when the lock is released, the reader will appear errored in the same way\n   * from now on; otherwise, the reader will appear closed.\n   *\n   * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by\n   * the reader's {@link ReadableStreamBYOBReader.read | read()} method has not yet been settled. Attempting to\n   * do so will throw a `TypeError` and leave the reader locked to the stream.\n   */\n  releaseLock(): void {\n    if (!IsReadableStreamBYOBReader(this)) {\n      throw byobReaderBrandCheckException('releaseLock');\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return;\n    }\n\n    if (this._readIntoRequests.length > 0) {\n      throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n    }\n\n    ReadableStreamReaderGenericRelease(this);\n  }\n}\n\nObject.defineProperties(ReadableStreamBYOBReader.prototype, {\n  cancel: { enumerable: true },\n  read: { enumerable: true },\n  releaseLock: { enumerable: true },\n  closed: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamBYOBReader.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamBYOBReader',\n    configurable: true\n  });\n}\n\n// Abstract operations for the readers.\n\nexport function IsReadableStreamBYOBReader(x: any): x is ReadableStreamBYOBReader {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readIntoRequests')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamBYOBReader;\n}\n\nexport function ReadableStreamBYOBReaderRead<T extends ArrayBufferView>(\n  reader: ReadableStreamBYOBReader,\n  view: T,\n  readIntoRequest: ReadIntoRequest<T>\n): void {\n  const stream = reader._ownerReadableStream;\n\n  assert(stream !== undefined);\n\n  stream._disturbed = true;\n\n  if (stream._state === 'errored') {\n    readIntoRequest._errorSteps(stream._storedError);\n  } else {\n    ReadableByteStreamControllerPullInto(\n      stream._readableStreamController as ReadableByteStreamController,\n      view,\n      readIntoRequest\n    );\n  }\n}\n\n// Helper functions for the ReadableStreamBYOBReader.\n\nfunction byobReaderBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamBYOBReader.prototype.${name} can only be used on a ReadableStreamBYOBReader`);\n}\n","import { QueuingStrategy, QueuingStrategySizeCallback } from '../queuing-strategy';\nimport NumberIsNaN from '../../stub/number-isnan';\n\nexport function ExtractHighWaterMark(strategy: QueuingStrategy, defaultHWM: number): number {\n  const { highWaterMark } = strategy;\n\n  if (highWaterMark === undefined) {\n    return defaultHWM;\n  }\n\n  if (NumberIsNaN(highWaterMark) || highWaterMark < 0) {\n    throw new RangeError('Invalid highWaterMark');\n  }\n\n  return highWaterMark;\n}\n\nexport function ExtractSizeAlgorithm<T>(strategy: QueuingStrategy<T>): QueuingStrategySizeCallback<T> {\n  const { size } = strategy;\n\n  if (!size) {\n    return () => 1;\n  }\n\n  return size;\n}\n","import { QueuingStrategy, QueuingStrategySizeCallback } from '../queuing-strategy';\nimport { assertDictionary, assertFunction, convertUnrestrictedDouble } from './basic';\n\nexport function convertQueuingStrategy<T>(init: QueuingStrategy<T> | null | undefined,\n                                          context: string): QueuingStrategy<T> {\n  assertDictionary(init, context);\n  const highWaterMark = init?.highWaterMark;\n  const size = init?.size;\n  return {\n    highWaterMark: highWaterMark === undefined ? undefined : convertUnrestrictedDouble(highWaterMark),\n    size: size === undefined ? undefined : convertQueuingStrategySize(size, `${context} has member 'size' that`)\n  };\n}\n\nfunction convertQueuingStrategySize<T>(fn: QueuingStrategySizeCallback<T>,\n                                       context: string): QueuingStrategySizeCallback<T> {\n  assertFunction(fn, context);\n  return chunk => convertUnrestrictedDouble(fn(chunk));\n}\n","import { assertDictionary, assertFunction } from './basic';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\nimport {\n  UnderlyingSink,\n  UnderlyingSinkAbortCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  ValidatedUnderlyingSink\n} from '../writable-stream/underlying-sink';\nimport { WritableStreamDefaultController } from '../writable-stream';\n\nexport function convertUnderlyingSink<W>(original: UnderlyingSink<W> | null,\n                                         context: string): ValidatedUnderlyingSink<W> {\n  assertDictionary(original, context);\n  const abort = original?.abort;\n  const close = original?.close;\n  const start = original?.start;\n  const type = original?.type;\n  const write = original?.write;\n  return {\n    abort: abort === undefined ?\n      undefined :\n      convertUnderlyingSinkAbortCallback(abort, original!, `${context} has member 'abort' that`),\n    close: close === undefined ?\n      undefined :\n      convertUnderlyingSinkCloseCallback(close, original!, `${context} has member 'close' that`),\n    start: start === undefined ?\n      undefined :\n      convertUnderlyingSinkStartCallback(start, original!, `${context} has member 'start' that`),\n    write: write === undefined ?\n      undefined :\n      convertUnderlyingSinkWriteCallback(write, original!, `${context} has member 'write' that`),\n    type\n  };\n}\n\nfunction convertUnderlyingSinkAbortCallback(\n  fn: UnderlyingSinkAbortCallback,\n  original: UnderlyingSink,\n  context: string\n): (reason: any) => Promise<void> {\n  assertFunction(fn, context);\n  return (reason: any) => promiseCall(fn, original, [reason]);\n}\n\nfunction convertUnderlyingSinkCloseCallback(\n  fn: UnderlyingSinkCloseCallback,\n  original: UnderlyingSink,\n  context: string\n): () => Promise<void> {\n  assertFunction(fn, context);\n  return () => promiseCall(fn, original, []);\n}\n\nfunction convertUnderlyingSinkStartCallback(\n  fn: UnderlyingSinkStartCallback,\n  original: UnderlyingSink,\n  context: string\n): UnderlyingSinkStartCallback {\n  assertFunction(fn, context);\n  return (controller: WritableStreamDefaultController) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertUnderlyingSinkWriteCallback<W>(\n  fn: UnderlyingSinkWriteCallback<W>,\n  original: UnderlyingSink<W>,\n  context: string\n): (chunk: W, controller: WritableStreamDefaultController) => Promise<void> {\n  assertFunction(fn, context);\n  return (chunk: W, controller: WritableStreamDefaultController) => promiseCall(fn, original, [chunk, controller]);\n}\n","import { IsWritableStream, WritableStream } from '../writable-stream';\n\nexport function assertWritableStream(x: unknown, context: string): asserts x is WritableStream {\n  if (!IsWritableStream(x)) {\n    throw new TypeError(`${context} is not a WritableStream.`);\n  }\n}\n","/**\n * A signal object that allows you to communicate with a request and abort it if required\n * via its associated `AbortController` object.\n *\n * @remarks\n *   This interface is compatible with the `AbortSignal` interface defined in TypeScript's DOM types.\n *   It is redefined here, so it can be polyfilled without a DOM, for example with\n *   {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.\n *\n * @public\n */\nexport interface AbortSignal {\n  /**\n   * Whether the request is aborted.\n   */\n  readonly aborted: boolean;\n\n  /**\n   * Add an event listener to be triggered when this signal becomes aborted.\n   */\n  addEventListener(type: 'abort', listener: () => void): void;\n\n  /**\n   * Remove an event listener that was previously added with {@link AbortSignal.addEventListener}.\n   */\n  removeEventListener(type: 'abort', listener: () => void): void;\n}\n\nexport function isAbortSignal(value: unknown): value is AbortSignal {\n  if (typeof value !== 'object' || value === null) {\n    return false;\n  }\n  try {\n    return typeof (value as AbortSignal).aborted === 'boolean';\n  } catch {\n    // AbortSignal.prototype.aborted throws if its brand check fails\n    return false;\n  }\n}\n\n/**\n * A controller object that allows you to abort an `AbortSignal` when desired.\n *\n * @remarks\n *   This interface is compatible with the `AbortController` interface defined in TypeScript's DOM types.\n *   It is redefined here, so it can be polyfilled without a DOM, for example with\n *   {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.\n *\n * @internal\n */\nexport interface AbortController {\n  readonly signal: AbortSignal;\n\n  abort(): void;\n}\n\ninterface AbortControllerConstructor {\n  new(): AbortController;\n}\n\nconst supportsAbortController = typeof (AbortController as any) === 'function';\n\n/**\n * Construct a new AbortController, if supported by the platform.\n *\n * @internal\n */\nexport function createAbortController(): AbortController | undefined {\n  if (supportsAbortController) {\n    return new (AbortController as AbortControllerConstructor)();\n  }\n  return undefined;\n}\n","import assert from '../stub/assert';\nimport {\n  newPromise,\n  promiseRejectedWith,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  uponPromise\n} from './helpers/webidl';\nimport {\n  DequeueValue,\n  EnqueueValueWithSize,\n  PeekQueueValue,\n  QueuePair,\n  ResetQueue\n} from './abstract-ops/queue-with-sizes';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { SimpleQueue } from './simple-queue';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { AbortSteps, ErrorSteps } from './abstract-ops/internal-methods';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport {\n  UnderlyingSink,\n  UnderlyingSinkAbortCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  ValidatedUnderlyingSink\n} from './writable-stream/underlying-sink';\nimport { assertObject, assertRequiredArgument } from './validators/basic';\nimport { convertUnderlyingSink } from './validators/underlying-sink';\nimport { assertWritableStream } from './validators/writable-stream';\nimport { AbortController, AbortSignal, createAbortController } from './abort-signal';\n\ntype WritableStreamState = 'writable' | 'closed' | 'erroring' | 'errored';\n\ninterface WriteOrCloseRequest {\n  _resolve: (value?: undefined) => void;\n  _reject: (reason: any) => void;\n}\n\ntype WriteRequest = WriteOrCloseRequest;\ntype CloseRequest = WriteOrCloseRequest;\n\ninterface PendingAbortRequest {\n  _promise: Promise<undefined>;\n  _resolve: (value?: undefined) => void;\n  _reject: (reason: any) => void;\n  _reason: any;\n  _wasAlreadyErroring: boolean;\n}\n\n/**\n * A writable stream represents a destination for data, into which you can write.\n *\n * @public\n */\nclass WritableStream<W = any> {\n  /** @internal */\n  _state!: WritableStreamState;\n  /** @internal */\n  _storedError: any;\n  /** @internal */\n  _writer: WritableStreamDefaultWriter<W> | undefined;\n  /** @internal */\n  _writableStreamController!: WritableStreamDefaultController<W>;\n  /** @internal */\n  _writeRequests!: SimpleQueue<WriteRequest>;\n  /** @internal */\n  _inFlightWriteRequest: WriteRequest | undefined;\n  /** @internal */\n  _closeRequest: CloseRequest | undefined;\n  /** @internal */\n  _inFlightCloseRequest: CloseRequest | undefined;\n  /** @internal */\n  _pendingAbortRequest: PendingAbortRequest | undefined;\n  /** @internal */\n  _backpressure!: boolean;\n\n  constructor(underlyingSink?: UnderlyingSink<W>, strategy?: QueuingStrategy<W>);\n  constructor(rawUnderlyingSink: UnderlyingSink<W> | null | undefined = {},\n              rawStrategy: QueuingStrategy<W> | null | undefined = {}) {\n    if (rawUnderlyingSink === undefined) {\n      rawUnderlyingSink = null;\n    } else {\n      assertObject(rawUnderlyingSink, 'First parameter');\n    }\n\n    const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');\n    const underlyingSink = convertUnderlyingSink(rawUnderlyingSink, 'First parameter');\n\n    InitializeWritableStream(this);\n\n    const type = underlyingSink.type;\n    if (type !== undefined) {\n      throw new RangeError('Invalid type is specified');\n    }\n\n    const sizeAlgorithm = ExtractSizeAlgorithm(strategy);\n    const highWaterMark = ExtractHighWaterMark(strategy, 1);\n\n    SetUpWritableStreamDefaultControllerFromUnderlyingSink(this, underlyingSink, highWaterMark, sizeAlgorithm);\n  }\n\n  /**\n   * Returns whether or not the writable stream is locked to a writer.\n   */\n  get locked(): boolean {\n    if (!IsWritableStream(this)) {\n      throw streamBrandCheckException('locked');\n    }\n\n    return IsWritableStreamLocked(this);\n  }\n\n  /**\n   * Aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be\n   * immediately moved to an errored state, with any queued-up writes discarded. This will also execute any abort\n   * mechanism of the underlying sink.\n   *\n   * The returned promise will fulfill if the stream shuts down successfully, or reject if the underlying sink signaled\n   * that there was an error doing so. Additionally, it will reject with a `TypeError` (without attempting to cancel\n   * the stream) if the stream is currently locked.\n   */\n  abort(reason: any = undefined): Promise<void> {\n    if (!IsWritableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('abort'));\n    }\n\n    if (IsWritableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot abort a stream that already has a writer'));\n    }\n\n    return WritableStreamAbort(this, reason);\n  }\n\n  /**\n   * Closes the stream. The underlying sink will finish processing any previously-written chunks, before invoking its\n   * close behavior. During this time any further attempts to write will fail (without erroring the stream).\n   *\n   * The method returns a promise that will fulfill if all remaining chunks are successfully written and the stream\n   * successfully closes, or rejects if an error is encountered during this process. Additionally, it will reject with\n   * a `TypeError` (without attempting to cancel the stream) if the stream is currently locked.\n   */\n  close() {\n    if (!IsWritableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('close'));\n    }\n\n    if (IsWritableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot close a stream that already has a writer'));\n    }\n\n    if (WritableStreamCloseQueuedOrInFlight(this)) {\n      return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));\n    }\n\n    return WritableStreamClose(this);\n  }\n\n  /**\n   * Creates a {@link WritableStreamDefaultWriter | writer} and locks the stream to the new writer. While the stream\n   * is locked, no other writer can be acquired until this one is released.\n   *\n   * This functionality is especially useful for creating abstractions that desire the ability to write to a stream\n   * without interruption or interleaving. By getting a writer for the stream, you can ensure nobody else can write at\n   * the same time, which would cause the resulting written data to be unpredictable and probably useless.\n   */\n  getWriter(): WritableStreamDefaultWriter<W> {\n    if (!IsWritableStream(this)) {\n      throw streamBrandCheckException('getWriter');\n    }\n\n    return AcquireWritableStreamDefaultWriter(this);\n  }\n}\n\nObject.defineProperties(WritableStream.prototype, {\n  abort: { enumerable: true },\n  close: { enumerable: true },\n  getWriter: { enumerable: true },\n  locked: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStream.prototype, Symbol.toStringTag, {\n    value: 'WritableStream',\n    configurable: true\n  });\n}\n\nexport {\n  AcquireWritableStreamDefaultWriter,\n  CreateWritableStream,\n  IsWritableStream,\n  IsWritableStreamLocked,\n  WritableStream,\n  WritableStreamAbort,\n  WritableStreamDefaultControllerErrorIfNeeded,\n  WritableStreamDefaultWriterCloseWithErrorPropagation,\n  WritableStreamDefaultWriterRelease,\n  WritableStreamDefaultWriterWrite,\n  WritableStreamCloseQueuedOrInFlight,\n  UnderlyingSink,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkAbortCallback\n};\n\n// Abstract operations for the WritableStream.\n\nfunction AcquireWritableStreamDefaultWriter<W>(stream: WritableStream<W>): WritableStreamDefaultWriter<W> {\n  return new WritableStreamDefaultWriter(stream);\n}\n\n// Throws if and only if startAlgorithm throws.\nfunction CreateWritableStream<W>(startAlgorithm: () => void | PromiseLike<void>,\n                                 writeAlgorithm: (chunk: W) => Promise<void>,\n                                 closeAlgorithm: () => Promise<void>,\n                                 abortAlgorithm: (reason: any) => Promise<void>,\n                                 highWaterMark = 1,\n                                 sizeAlgorithm: QueuingStrategySizeCallback<W> = () => 1) {\n  assert(IsNonNegativeNumber(highWaterMark));\n\n  const stream: WritableStream<W> = Object.create(WritableStream.prototype);\n  InitializeWritableStream(stream);\n\n  const controller: WritableStreamDefaultController<W> = Object.create(WritableStreamDefaultController.prototype);\n\n  SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm,\n                                       abortAlgorithm, highWaterMark, sizeAlgorithm);\n  return stream;\n}\n\nfunction InitializeWritableStream<W>(stream: WritableStream<W>) {\n  stream._state = 'writable';\n\n  // The error that will be reported by new method calls once the state becomes errored. Only set when [[state]] is\n  // 'erroring' or 'errored'. May be set to an undefined value.\n  stream._storedError = undefined;\n\n  stream._writer = undefined;\n\n  // Initialize to undefined first because the constructor of the controller checks this\n  // variable to validate the caller.\n  stream._writableStreamController = undefined!;\n\n  // This queue is placed here instead of the writer class in order to allow for passing a writer to the next data\n  // producer without waiting for the queued writes to finish.\n  stream._writeRequests = new SimpleQueue();\n\n  // Write requests are removed from _writeRequests when write() is called on the underlying sink. This prevents\n  // them from being erroneously rejected on error. If a write() call is in-flight, the request is stored here.\n  stream._inFlightWriteRequest = undefined;\n\n  // The promise that was returned from writer.close(). Stored here because it may be fulfilled after the writer\n  // has been detached.\n  stream._closeRequest = undefined;\n\n  // Close request is removed from _closeRequest when close() is called on the underlying sink. This prevents it\n  // from being erroneously rejected on error. If a close() call is in-flight, the request is stored here.\n  stream._inFlightCloseRequest = undefined;\n\n  // The promise that was returned from writer.abort(). This may also be fulfilled after the writer has detached.\n  stream._pendingAbortRequest = undefined;\n\n  // The backpressure signal set by the controller.\n  stream._backpressure = false;\n}\n\nfunction IsWritableStream(x: unknown): x is WritableStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_writableStreamController')) {\n    return false;\n  }\n\n  return x instanceof WritableStream;\n}\n\nfunction IsWritableStreamLocked(stream: WritableStream): boolean {\n  assert(IsWritableStream(stream));\n\n  if (stream._writer === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamAbort(stream: WritableStream, reason: any): Promise<undefined> {\n  if (stream._state === 'closed' || stream._state === 'errored') {\n    return promiseResolvedWith(undefined);\n  }\n  stream._writableStreamController._abortReason = reason;\n  stream._writableStreamController._abortController?.abort();\n\n  // TypeScript narrows the type of `stream._state` down to 'writable' | 'erroring',\n  // but it doesn't know that signaling abort runs author code that might have changed the state.\n  // Widen the type again by casting to WritableStreamState.\n  const state = stream._state as WritableStreamState;\n\n  if (state === 'closed' || state === 'errored') {\n    return promiseResolvedWith(undefined);\n  }\n  if (stream._pendingAbortRequest !== undefined) {\n    return stream._pendingAbortRequest._promise;\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n\n  let wasAlreadyErroring = false;\n  if (state === 'erroring') {\n    wasAlreadyErroring = true;\n    // reason will not be used, so don't keep a reference to it.\n    reason = undefined;\n  }\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    stream._pendingAbortRequest = {\n      _promise: undefined!,\n      _resolve: resolve,\n      _reject: reject,\n      _reason: reason,\n      _wasAlreadyErroring: wasAlreadyErroring\n    };\n  });\n  stream._pendingAbortRequest!._promise = promise;\n\n  if (!wasAlreadyErroring) {\n    WritableStreamStartErroring(stream, reason);\n  }\n\n  return promise;\n}\n\nfunction WritableStreamClose(stream: WritableStream<any>): Promise<undefined> {\n  const state = stream._state;\n  if (state === 'closed' || state === 'errored') {\n    return promiseRejectedWith(new TypeError(\n      `The stream (in ${state} state) is not in the writable state and cannot be closed`));\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n  assert(!WritableStreamCloseQueuedOrInFlight(stream));\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    const closeRequest: CloseRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._closeRequest = closeRequest;\n  });\n\n  const writer = stream._writer;\n  if (writer !== undefined && stream._backpressure && state === 'writable') {\n    defaultWriterReadyPromiseResolve(writer);\n  }\n\n  WritableStreamDefaultControllerClose(stream._writableStreamController);\n\n  return promise;\n}\n\n// WritableStream API exposed for controllers.\n\nfunction WritableStreamAddWriteRequest(stream: WritableStream): Promise<undefined> {\n  assert(IsWritableStreamLocked(stream));\n  assert(stream._state === 'writable');\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    const writeRequest: WriteRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._writeRequests.push(writeRequest);\n  });\n\n  return promise;\n}\n\nfunction WritableStreamDealWithRejection(stream: WritableStream, error: any) {\n  const state = stream._state;\n\n  if (state === 'writable') {\n    WritableStreamStartErroring(stream, error);\n    return;\n  }\n\n  assert(state === 'erroring');\n  WritableStreamFinishErroring(stream);\n}\n\nfunction WritableStreamStartErroring(stream: WritableStream, reason: any) {\n  assert(stream._storedError === undefined);\n  assert(stream._state === 'writable');\n\n  const controller = stream._writableStreamController;\n  assert(controller !== undefined);\n\n  stream._state = 'erroring';\n  stream._storedError = reason;\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);\n  }\n\n  if (!WritableStreamHasOperationMarkedInFlight(stream) && controller._started) {\n    WritableStreamFinishErroring(stream);\n  }\n}\n\nfunction WritableStreamFinishErroring(stream: WritableStream) {\n  assert(stream._state === 'erroring');\n  assert(!WritableStreamHasOperationMarkedInFlight(stream));\n  stream._state = 'errored';\n  stream._writableStreamController[ErrorSteps]();\n\n  const storedError = stream._storedError;\n  stream._writeRequests.forEach(writeRequest => {\n    writeRequest._reject(storedError);\n  });\n  stream._writeRequests = new SimpleQueue();\n\n  if (stream._pendingAbortRequest === undefined) {\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    return;\n  }\n\n  const abortRequest = stream._pendingAbortRequest;\n  stream._pendingAbortRequest = undefined;\n\n  if (abortRequest._wasAlreadyErroring) {\n    abortRequest._reject(storedError);\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    return;\n  }\n\n  const promise = stream._writableStreamController[AbortSteps](abortRequest._reason);\n  uponPromise(\n    promise,\n    () => {\n      abortRequest._resolve();\n      WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    },\n    (reason: any) => {\n      abortRequest._reject(reason);\n      WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    });\n}\n\nfunction WritableStreamFinishInFlightWrite(stream: WritableStream) {\n  assert(stream._inFlightWriteRequest !== undefined);\n  stream._inFlightWriteRequest!._resolve(undefined);\n  stream._inFlightWriteRequest = undefined;\n}\n\nfunction WritableStreamFinishInFlightWriteWithError(stream: WritableStream, error: any) {\n  assert(stream._inFlightWriteRequest !== undefined);\n  stream._inFlightWriteRequest!._reject(error);\n  stream._inFlightWriteRequest = undefined;\n\n  assert(stream._state === 'writable' || stream._state === 'erroring');\n\n  WritableStreamDealWithRejection(stream, error);\n}\n\nfunction WritableStreamFinishInFlightClose(stream: WritableStream) {\n  assert(stream._inFlightCloseRequest !== undefined);\n  stream._inFlightCloseRequest!._resolve(undefined);\n  stream._inFlightCloseRequest = undefined;\n\n  const state = stream._state;\n\n  assert(state === 'writable' || state === 'erroring');\n\n  if (state === 'erroring') {\n    // The error was too late to do anything, so it is ignored.\n    stream._storedError = undefined;\n    if (stream._pendingAbortRequest !== undefined) {\n      stream._pendingAbortRequest._resolve();\n      stream._pendingAbortRequest = undefined;\n    }\n  }\n\n  stream._state = 'closed';\n\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    defaultWriterClosedPromiseResolve(writer);\n  }\n\n  assert(stream._pendingAbortRequest === undefined);\n  assert(stream._storedError === undefined);\n}\n\nfunction WritableStreamFinishInFlightCloseWithError(stream: WritableStream, error: any) {\n  assert(stream._inFlightCloseRequest !== undefined);\n  stream._inFlightCloseRequest!._reject(error);\n  stream._inFlightCloseRequest = undefined;\n\n  assert(stream._state === 'writable' || stream._state === 'erroring');\n\n  // Never execute sink abort() after sink close().\n  if (stream._pendingAbortRequest !== undefined) {\n    stream._pendingAbortRequest._reject(error);\n    stream._pendingAbortRequest = undefined;\n  }\n  WritableStreamDealWithRejection(stream, error);\n}\n\n// TODO(ricea): Fix alphabetical order.\nfunction WritableStreamCloseQueuedOrInFlight(stream: WritableStream): boolean {\n  if (stream._closeRequest === undefined && stream._inFlightCloseRequest === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamHasOperationMarkedInFlight(stream: WritableStream): boolean {\n  if (stream._inFlightWriteRequest === undefined && stream._inFlightCloseRequest === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamMarkCloseRequestInFlight(stream: WritableStream) {\n  assert(stream._inFlightCloseRequest === undefined);\n  assert(stream._closeRequest !== undefined);\n  stream._inFlightCloseRequest = stream._closeRequest;\n  stream._closeRequest = undefined;\n}\n\nfunction WritableStreamMarkFirstWriteRequestInFlight(stream: WritableStream) {\n  assert(stream._inFlightWriteRequest === undefined);\n  assert(stream._writeRequests.length !== 0);\n  stream._inFlightWriteRequest = stream._writeRequests.shift();\n}\n\nfunction WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream: WritableStream) {\n  assert(stream._state === 'errored');\n  if (stream._closeRequest !== undefined) {\n    assert(stream._inFlightCloseRequest === undefined);\n\n    stream._closeRequest._reject(stream._storedError);\n    stream._closeRequest = undefined;\n  }\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    defaultWriterClosedPromiseReject(writer, stream._storedError);\n  }\n}\n\nfunction WritableStreamUpdateBackpressure(stream: WritableStream, backpressure: boolean) {\n  assert(stream._state === 'writable');\n  assert(!WritableStreamCloseQueuedOrInFlight(stream));\n\n  const writer = stream._writer;\n  if (writer !== undefined && backpressure !== stream._backpressure) {\n    if (backpressure) {\n      defaultWriterReadyPromiseReset(writer);\n    } else {\n      assert(!backpressure);\n\n      defaultWriterReadyPromiseResolve(writer);\n    }\n  }\n\n  stream._backpressure = backpressure;\n}\n\n/**\n * A default writer vended by a {@link WritableStream}.\n *\n * @public\n */\nexport class WritableStreamDefaultWriter<W = any> {\n  /** @internal */\n  _ownerWritableStream: WritableStream<W>;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _closedPromiseState!: 'pending' | 'resolved' | 'rejected';\n  /** @internal */\n  _readyPromise!: Promise<undefined>;\n  /** @internal */\n  _readyPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _readyPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readyPromiseState!: 'pending' | 'fulfilled' | 'rejected';\n\n  constructor(stream: WritableStream<W>) {\n    assertRequiredArgument(stream, 1, 'WritableStreamDefaultWriter');\n    assertWritableStream(stream, 'First parameter');\n\n    if (IsWritableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive writing by another writer');\n    }\n\n    this._ownerWritableStream = stream;\n    stream._writer = this;\n\n    const state = stream._state;\n\n    if (state === 'writable') {\n      if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._backpressure) {\n        defaultWriterReadyPromiseInitialize(this);\n      } else {\n        defaultWriterReadyPromiseInitializeAsResolved(this);\n      }\n\n      defaultWriterClosedPromiseInitialize(this);\n    } else if (state === 'erroring') {\n      defaultWriterReadyPromiseInitializeAsRejected(this, stream._storedError);\n      defaultWriterClosedPromiseInitialize(this);\n    } else if (state === 'closed') {\n      defaultWriterReadyPromiseInitializeAsResolved(this);\n      defaultWriterClosedPromiseInitializeAsResolved(this);\n    } else {\n      assert(state === 'errored');\n\n      const storedError = stream._storedError;\n      defaultWriterReadyPromiseInitializeAsRejected(this, storedError);\n      defaultWriterClosedPromiseInitializeAsRejected(this, storedError);\n    }\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or\n   * the writer’s lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * Returns the desired size to fill the stream’s internal queue. It can be negative, if the queue is over-full.\n   * A producer can use this information to determine the right amount of data to write.\n   *\n   * It will be `null` if the stream cannot be successfully written to (due to either being errored, or having an abort\n   * queued up). It will return zero if the stream is closed. And the getter will throw an exception if invoked when\n   * the writer’s lock is released.\n   */\n  get desiredSize(): number | null {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      throw defaultWriterBrandCheckException('desiredSize');\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      throw defaultWriterLockException('desiredSize');\n    }\n\n    return WritableStreamDefaultWriterGetDesiredSize(this);\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the desired size to fill the stream’s internal queue transitions\n   * from non-positive to positive, signaling that it is no longer applying backpressure. Once the desired size dips\n   * back to zero or below, the getter will return a new promise that stays pending until the next transition.\n   *\n   * If the stream becomes errored or aborted, or the writer’s lock is released, the returned promise will become\n   * rejected.\n   */\n  get ready(): Promise<undefined> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('ready'));\n    }\n\n    return this._readyPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link WritableStream.abort | stream.abort(reason)}.\n   */\n  abort(reason: any = undefined): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('abort'));\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('abort'));\n    }\n\n    return WritableStreamDefaultWriterAbort(this, reason);\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link WritableStream.close | stream.close()}.\n   */\n  close(): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('close'));\n    }\n\n    const stream = this._ownerWritableStream;\n\n    if (stream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('close'));\n    }\n\n    if (WritableStreamCloseQueuedOrInFlight(stream)) {\n      return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));\n    }\n\n    return WritableStreamDefaultWriterClose(this);\n  }\n\n  /**\n   * Releases the writer’s lock on the corresponding stream. After the lock is released, the writer is no longer active.\n   * If the associated stream is errored when the lock is released, the writer will appear errored in the same way from\n   * now on; otherwise, the writer will appear closed.\n   *\n   * Note that the lock can still be released even if some ongoing writes have not yet finished (i.e. even if the\n   * promises returned from previous calls to {@link WritableStreamDefaultWriter.write | write()} have not yet settled).\n   * It’s not necessary to hold the lock on the writer for the duration of the write; the lock instead simply prevents\n   * other producers from writing in an interleaved manner.\n   */\n  releaseLock(): void {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      throw defaultWriterBrandCheckException('releaseLock');\n    }\n\n    const stream = this._ownerWritableStream;\n\n    if (stream === undefined) {\n      return;\n    }\n\n    assert(stream._writer !== undefined);\n\n    WritableStreamDefaultWriterRelease(this);\n  }\n\n  /**\n   * Writes the given chunk to the writable stream, by waiting until any previous writes have finished successfully,\n   * and then sending the chunk to the underlying sink's {@link UnderlyingSink.write | write()} method. It will return\n   * a promise that fulfills with undefined upon a successful write, or rejects if the write fails or stream becomes\n   * errored before the writing process is initiated.\n   *\n   * Note that what \"success\" means is up to the underlying sink; it might indicate simply that the chunk has been\n   * accepted, and not necessarily that it is safely saved to its ultimate destination.\n   */\n  write(chunk: W): Promise<void>;\n  write(chunk: W = undefined!): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('write'));\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('write to'));\n    }\n\n    return WritableStreamDefaultWriterWrite(this, chunk);\n  }\n}\n\nObject.defineProperties(WritableStreamDefaultWriter.prototype, {\n  abort: { enumerable: true },\n  close: { enumerable: true },\n  releaseLock: { enumerable: true },\n  write: { enumerable: true },\n  closed: { enumerable: true },\n  desiredSize: { enumerable: true },\n  ready: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStreamDefaultWriter.prototype, Symbol.toStringTag, {\n    value: 'WritableStreamDefaultWriter',\n    configurable: true\n  });\n}\n\n// Abstract operations for the WritableStreamDefaultWriter.\n\nfunction IsWritableStreamDefaultWriter<W = any>(x: any): x is WritableStreamDefaultWriter<W> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) {\n    return false;\n  }\n\n  return x instanceof WritableStreamDefaultWriter;\n}\n\n// A client of WritableStreamDefaultWriter may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultWriterAbort(writer: WritableStreamDefaultWriter, reason: any) {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  return WritableStreamAbort(stream, reason);\n}\n\nfunction WritableStreamDefaultWriterClose(writer: WritableStreamDefaultWriter): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  return WritableStreamClose(stream);\n}\n\nfunction WritableStreamDefaultWriterCloseWithErrorPropagation(writer: WritableStreamDefaultWriter): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  const state = stream._state;\n  if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {\n    return promiseResolvedWith(undefined);\n  }\n\n  if (state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n\n  return WritableStreamDefaultWriterClose(writer);\n}\n\nfunction WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer: WritableStreamDefaultWriter, error: any) {\n  if (writer._closedPromiseState === 'pending') {\n    defaultWriterClosedPromiseReject(writer, error);\n  } else {\n    defaultWriterClosedPromiseResetToRejected(writer, error);\n  }\n}\n\nfunction WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer: WritableStreamDefaultWriter, error: any) {\n  if (writer._readyPromiseState === 'pending') {\n    defaultWriterReadyPromiseReject(writer, error);\n  } else {\n    defaultWriterReadyPromiseResetToRejected(writer, error);\n  }\n}\n\nfunction WritableStreamDefaultWriterGetDesiredSize(writer: WritableStreamDefaultWriter): number | null {\n  const stream = writer._ownerWritableStream;\n  const state = stream._state;\n\n  if (state === 'errored' || state === 'erroring') {\n    return null;\n  }\n\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return WritableStreamDefaultControllerGetDesiredSize(stream._writableStreamController);\n}\n\nfunction WritableStreamDefaultWriterRelease(writer: WritableStreamDefaultWriter) {\n  const stream = writer._ownerWritableStream;\n  assert(stream !== undefined);\n  assert(stream._writer === writer);\n\n  const releasedError = new TypeError(\n    `Writer was released and can no longer be used to monitor the stream's closedness`);\n\n  WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, releasedError);\n\n  // The state transitions to \"errored\" before the sink abort() method runs, but the writer.closed promise is not\n  // rejected until afterwards. This means that simply testing state will not work.\n  WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, releasedError);\n\n  stream._writer = undefined;\n  writer._ownerWritableStream = undefined!;\n}\n\nfunction WritableStreamDefaultWriterWrite<W>(writer: WritableStreamDefaultWriter<W>, chunk: W): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  const controller = stream._writableStreamController;\n\n  const chunkSize = WritableStreamDefaultControllerGetChunkSize(controller, chunk);\n\n  if (stream !== writer._ownerWritableStream) {\n    return promiseRejectedWith(defaultWriterLockException('write to'));\n  }\n\n  const state = stream._state;\n  if (state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n  if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {\n    return promiseRejectedWith(new TypeError('The stream is closing or closed and cannot be written to'));\n  }\n  if (state === 'erroring') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  assert(state === 'writable');\n\n  const promise = WritableStreamAddWriteRequest(stream);\n\n  WritableStreamDefaultControllerWrite(controller, chunk, chunkSize);\n\n  return promise;\n}\n\nconst closeSentinel: unique symbol = {} as any;\n\ntype QueueRecord<W> = W | typeof closeSentinel;\n\n/**\n * Allows control of a {@link WritableStream | writable stream}'s state and internal queue.\n *\n * @public\n */\nexport class WritableStreamDefaultController<W = any> {\n  /** @internal */\n  _controlledWritableStream!: WritableStream<W>;\n  /** @internal */\n  _queue!: SimpleQueue<QueuePair<QueueRecord<W>>>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _abortReason: any;\n  /** @internal */\n  _abortController: AbortController | undefined;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _strategySizeAlgorithm!: QueuingStrategySizeCallback<W>;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _writeAlgorithm!: (chunk: W) => Promise<void>;\n  /** @internal */\n  _closeAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _abortAlgorithm!: (reason: any) => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * The reason which was passed to `WritableStream.abort(reason)` when the stream was aborted.\n   *\n   * @deprecated\n   *  This property has been removed from the specification, see https://github.com/whatwg/streams/pull/1177.\n   *  Use {@link WritableStreamDefaultController.signal}'s `reason` instead.\n   */\n  get abortReason(): any {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('abortReason');\n    }\n    return this._abortReason;\n  }\n\n  /**\n   * An `AbortSignal` that can be used to abort the pending write or close operation when the stream is aborted.\n   */\n  get signal(): AbortSignal {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('signal');\n    }\n    if (this._abortController === undefined) {\n      // Older browsers or older Node versions may not support `AbortController` or `AbortSignal`.\n      // We don't want to bundle and ship an `AbortController` polyfill together with our polyfill,\n      // so instead we only implement support for `signal` if we find a global `AbortController` constructor.\n      throw new TypeError('WritableStreamDefaultController.prototype.signal is not supported');\n    }\n    return this._abortController.signal;\n  }\n\n  /**\n   * Closes the controlled writable stream, making all future interactions with it fail with the given error `e`.\n   *\n   * This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying\n   * sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the\n   * normal lifecycle of interactions with the underlying sink.\n   */\n  error(e: any = undefined): void {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n    const state = this._controlledWritableStream._state;\n    if (state !== 'writable') {\n      // The stream is closed, errored or will be soon. The sink can't do anything useful if it gets an error here, so\n      // just treat it as a no-op.\n      return;\n    }\n\n    WritableStreamDefaultControllerError(this, e);\n  }\n\n  /** @internal */\n  [AbortSteps](reason: any): Promise<void> {\n    const result = this._abortAlgorithm(reason);\n    WritableStreamDefaultControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [ErrorSteps]() {\n    ResetQueue(this);\n  }\n}\n\nObject.defineProperties(WritableStreamDefaultController.prototype, {\n  abortReason: { enumerable: true },\n  signal: { enumerable: true },\n  error: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'WritableStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Abstract operations implementing interface required by the WritableStream.\n\nfunction IsWritableStreamDefaultController(x: any): x is WritableStreamDefaultController<any> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledWritableStream')) {\n    return false;\n  }\n\n  return x instanceof WritableStreamDefaultController;\n}\n\nfunction SetUpWritableStreamDefaultController<W>(stream: WritableStream<W>,\n                                                 controller: WritableStreamDefaultController<W>,\n                                                 startAlgorithm: () => void | PromiseLike<void>,\n                                                 writeAlgorithm: (chunk: W) => Promise<void>,\n                                                 closeAlgorithm: () => Promise<void>,\n                                                 abortAlgorithm: (reason: any) => Promise<void>,\n                                                 highWaterMark: number,\n                                                 sizeAlgorithm: QueuingStrategySizeCallback<W>) {\n  assert(IsWritableStream(stream));\n  assert(stream._writableStreamController === undefined);\n\n  controller._controlledWritableStream = stream;\n  stream._writableStreamController = controller;\n\n  // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n  controller._queue = undefined!;\n  controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._abortReason = undefined;\n  controller._abortController = createAbortController();\n  controller._started = false;\n\n  controller._strategySizeAlgorithm = sizeAlgorithm;\n  controller._strategyHWM = highWaterMark;\n\n  controller._writeAlgorithm = writeAlgorithm;\n  controller._closeAlgorithm = closeAlgorithm;\n  controller._abortAlgorithm = abortAlgorithm;\n\n  const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n  WritableStreamUpdateBackpressure(stream, backpressure);\n\n  const startResult = startAlgorithm();\n  const startPromise = promiseResolvedWith(startResult);\n  uponPromise(\n    startPromise,\n    () => {\n      assert(stream._state === 'writable' || stream._state === 'erroring');\n      controller._started = true;\n      WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n    },\n    r => {\n      assert(stream._state === 'writable' || stream._state === 'erroring');\n      controller._started = true;\n      WritableStreamDealWithRejection(stream, r);\n    }\n  );\n}\n\nfunction SetUpWritableStreamDefaultControllerFromUnderlyingSink<W>(stream: WritableStream<W>,\n                                                                   underlyingSink: ValidatedUnderlyingSink<W>,\n                                                                   highWaterMark: number,\n                                                                   sizeAlgorithm: QueuingStrategySizeCallback<W>) {\n  const controller = Object.create(WritableStreamDefaultController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let writeAlgorithm: (chunk: W) => Promise<void> = () => promiseResolvedWith(undefined);\n  let closeAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let abortAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingSink.start !== undefined) {\n    startAlgorithm = () => underlyingSink.start!(controller);\n  }\n  if (underlyingSink.write !== undefined) {\n    writeAlgorithm = chunk => underlyingSink.write!(chunk, controller);\n  }\n  if (underlyingSink.close !== undefined) {\n    closeAlgorithm = () => underlyingSink.close!();\n  }\n  if (underlyingSink.abort !== undefined) {\n    abortAlgorithm = reason => underlyingSink.abort!(reason);\n  }\n\n  SetUpWritableStreamDefaultController(\n    stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm\n  );\n}\n\n// ClearAlgorithms may be called twice. Erroring the same stream in multiple ways will often result in redundant calls.\nfunction WritableStreamDefaultControllerClearAlgorithms(controller: WritableStreamDefaultController<any>) {\n  controller._writeAlgorithm = undefined!;\n  controller._closeAlgorithm = undefined!;\n  controller._abortAlgorithm = undefined!;\n  controller._strategySizeAlgorithm = undefined!;\n}\n\nfunction WritableStreamDefaultControllerClose<W>(controller: WritableStreamDefaultController<W>) {\n  EnqueueValueWithSize(controller, closeSentinel, 0);\n  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\nfunction WritableStreamDefaultControllerGetChunkSize<W>(controller: WritableStreamDefaultController<W>,\n                                                        chunk: W): number {\n  try {\n    return controller._strategySizeAlgorithm(chunk);\n  } catch (chunkSizeE) {\n    WritableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE);\n    return 1;\n  }\n}\n\nfunction WritableStreamDefaultControllerGetDesiredSize(controller: WritableStreamDefaultController<any>): number {\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\nfunction WritableStreamDefaultControllerWrite<W>(controller: WritableStreamDefaultController<W>,\n                                                 chunk: W,\n                                                 chunkSize: number) {\n  try {\n    EnqueueValueWithSize(controller, chunk, chunkSize);\n  } catch (enqueueE) {\n    WritableStreamDefaultControllerErrorIfNeeded(controller, enqueueE);\n    return;\n  }\n\n  const stream = controller._controlledWritableStream;\n  if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._state === 'writable') {\n    const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n    WritableStreamUpdateBackpressure(stream, backpressure);\n  }\n\n  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\n// Abstract operations for the WritableStreamDefaultController.\n\nfunction WritableStreamDefaultControllerAdvanceQueueIfNeeded<W>(controller: WritableStreamDefaultController<W>) {\n  const stream = controller._controlledWritableStream;\n\n  if (!controller._started) {\n    return;\n  }\n\n  if (stream._inFlightWriteRequest !== undefined) {\n    return;\n  }\n\n  const state = stream._state;\n  assert(state !== 'closed' && state !== 'errored');\n  if (state === 'erroring') {\n    WritableStreamFinishErroring(stream);\n    return;\n  }\n\n  if (controller._queue.length === 0) {\n    return;\n  }\n\n  const value = PeekQueueValue(controller);\n  if (value === closeSentinel) {\n    WritableStreamDefaultControllerProcessClose(controller);\n  } else {\n    WritableStreamDefaultControllerProcessWrite(controller, value);\n  }\n}\n\nfunction WritableStreamDefaultControllerErrorIfNeeded(controller: WritableStreamDefaultController<any>, error: any) {\n  if (controller._controlledWritableStream._state === 'writable') {\n    WritableStreamDefaultControllerError(controller, error);\n  }\n}\n\nfunction WritableStreamDefaultControllerProcessClose(controller: WritableStreamDefaultController<any>) {\n  const stream = controller._controlledWritableStream;\n\n  WritableStreamMarkCloseRequestInFlight(stream);\n\n  DequeueValue(controller);\n  assert(controller._queue.length === 0);\n\n  const sinkClosePromise = controller._closeAlgorithm();\n  WritableStreamDefaultControllerClearAlgorithms(controller);\n  uponPromise(\n    sinkClosePromise,\n    () => {\n      WritableStreamFinishInFlightClose(stream);\n    },\n    reason => {\n      WritableStreamFinishInFlightCloseWithError(stream, reason);\n    }\n  );\n}\n\nfunction WritableStreamDefaultControllerProcessWrite<W>(controller: WritableStreamDefaultController<W>, chunk: W) {\n  const stream = controller._controlledWritableStream;\n\n  WritableStreamMarkFirstWriteRequestInFlight(stream);\n\n  const sinkWritePromise = controller._writeAlgorithm(chunk);\n  uponPromise(\n    sinkWritePromise,\n    () => {\n      WritableStreamFinishInFlightWrite(stream);\n\n      const state = stream._state;\n      assert(state === 'writable' || state === 'erroring');\n\n      DequeueValue(controller);\n\n      if (!WritableStreamCloseQueuedOrInFlight(stream) && state === 'writable') {\n        const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n        WritableStreamUpdateBackpressure(stream, backpressure);\n      }\n\n      WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n    },\n    reason => {\n      if (stream._state === 'writable') {\n        WritableStreamDefaultControllerClearAlgorithms(controller);\n      }\n      WritableStreamFinishInFlightWriteWithError(stream, reason);\n    }\n  );\n}\n\nfunction WritableStreamDefaultControllerGetBackpressure(controller: WritableStreamDefaultController<any>): boolean {\n  const desiredSize = WritableStreamDefaultControllerGetDesiredSize(controller);\n  return desiredSize <= 0;\n}\n\n// A client of WritableStreamDefaultController may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultControllerError(controller: WritableStreamDefaultController<any>, error: any) {\n  const stream = controller._controlledWritableStream;\n\n  assert(stream._state === 'writable');\n\n  WritableStreamDefaultControllerClearAlgorithms(controller);\n  WritableStreamStartErroring(stream, error);\n}\n\n// Helper functions for the WritableStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(`WritableStream.prototype.${name} can only be used on a WritableStream`);\n}\n\n// Helper functions for the WritableStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `WritableStreamDefaultController.prototype.${name} can only be used on a WritableStreamDefaultController`);\n}\n\n\n// Helper functions for the WritableStreamDefaultWriter.\n\nfunction defaultWriterBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `WritableStreamDefaultWriter.prototype.${name} can only be used on a WritableStreamDefaultWriter`);\n}\n\nfunction defaultWriterLockException(name: string): TypeError {\n  return new TypeError('Cannot ' + name + ' a stream using a released writer');\n}\n\nfunction defaultWriterClosedPromiseInitialize(writer: WritableStreamDefaultWriter) {\n  writer._closedPromise = newPromise((resolve, reject) => {\n    writer._closedPromise_resolve = resolve;\n    writer._closedPromise_reject = reject;\n    writer._closedPromiseState = 'pending';\n  });\n}\n\nfunction defaultWriterClosedPromiseInitializeAsRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  defaultWriterClosedPromiseInitialize(writer);\n  defaultWriterClosedPromiseReject(writer, reason);\n}\n\nfunction defaultWriterClosedPromiseInitializeAsResolved(writer: WritableStreamDefaultWriter) {\n  defaultWriterClosedPromiseInitialize(writer);\n  defaultWriterClosedPromiseResolve(writer);\n}\n\nfunction defaultWriterClosedPromiseReject(writer: WritableStreamDefaultWriter, reason: any) {\n  if (writer._closedPromise_reject === undefined) {\n    return;\n  }\n  assert(writer._closedPromiseState === 'pending');\n\n  setPromiseIsHandledToTrue(writer._closedPromise);\n  writer._closedPromise_reject(reason);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'rejected';\n}\n\nfunction defaultWriterClosedPromiseResetToRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  assert(writer._closedPromise_resolve === undefined);\n  assert(writer._closedPromise_reject === undefined);\n  assert(writer._closedPromiseState !== 'pending');\n\n  defaultWriterClosedPromiseInitializeAsRejected(writer, reason);\n}\n\nfunction defaultWriterClosedPromiseResolve(writer: WritableStreamDefaultWriter) {\n  if (writer._closedPromise_resolve === undefined) {\n    return;\n  }\n  assert(writer._closedPromiseState === 'pending');\n\n  writer._closedPromise_resolve(undefined);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'resolved';\n}\n\nfunction defaultWriterReadyPromiseInitialize(writer: WritableStreamDefaultWriter) {\n  writer._readyPromise = newPromise((resolve, reject) => {\n    writer._readyPromise_resolve = resolve;\n    writer._readyPromise_reject = reject;\n  });\n  writer._readyPromiseState = 'pending';\n}\n\nfunction defaultWriterReadyPromiseInitializeAsRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  defaultWriterReadyPromiseInitialize(writer);\n  defaultWriterReadyPromiseReject(writer, reason);\n}\n\nfunction defaultWriterReadyPromiseInitializeAsResolved(writer: WritableStreamDefaultWriter) {\n  defaultWriterReadyPromiseInitialize(writer);\n  defaultWriterReadyPromiseResolve(writer);\n}\n\nfunction defaultWriterReadyPromiseReject(writer: WritableStreamDefaultWriter, reason: any) {\n  if (writer._readyPromise_reject === undefined) {\n    return;\n  }\n\n  setPromiseIsHandledToTrue(writer._readyPromise);\n  writer._readyPromise_reject(reason);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'rejected';\n}\n\nfunction defaultWriterReadyPromiseReset(writer: WritableStreamDefaultWriter) {\n  assert(writer._readyPromise_resolve === undefined);\n  assert(writer._readyPromise_reject === undefined);\n\n  defaultWriterReadyPromiseInitialize(writer);\n}\n\nfunction defaultWriterReadyPromiseResetToRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  assert(writer._readyPromise_resolve === undefined);\n  assert(writer._readyPromise_reject === undefined);\n\n  defaultWriterReadyPromiseInitializeAsRejected(writer, reason);\n}\n\nfunction defaultWriterReadyPromiseResolve(writer: WritableStreamDefaultWriter) {\n  if (writer._readyPromise_resolve === undefined) {\n    return;\n  }\n\n  writer._readyPromise_resolve(undefined);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'fulfilled';\n}\n","/// <reference lib=\"dom\" />\nexport const NativeDOMException: typeof DOMException | undefined =\n  typeof DOMException !== 'undefined' ? DOMException : undefined;\n","/// <reference types=\"node\" />\nimport { NativeDOMException } from './native';\n\ndeclare class DOMExceptionClass extends Error {\n  constructor(message?: string, name?: string);\n\n  name: string;\n  message: string;\n}\n\ntype DOMException = DOMExceptionClass;\ntype DOMExceptionConstructor = typeof DOMExceptionClass;\n\nfunction isDOMExceptionConstructor(ctor: unknown): ctor is DOMExceptionConstructor {\n  if (!(typeof ctor === 'function' || typeof ctor === 'object')) {\n    return false;\n  }\n  try {\n    new (ctor as DOMExceptionConstructor)();\n    return true;\n  } catch {\n    return false;\n  }\n}\n\nfunction createDOMExceptionPolyfill(): DOMExceptionConstructor {\n  // eslint-disable-next-line no-shadow\n  const ctor = function DOMException(this: DOMException, message?: string, name?: string) {\n    this.message = message || '';\n    this.name = name || 'Error';\n    if (Error.captureStackTrace) {\n      Error.captureStackTrace(this, this.constructor);\n    }\n  } as any;\n  ctor.prototype = Object.create(Error.prototype);\n  Object.defineProperty(ctor.prototype, 'constructor', { value: ctor, writable: true, configurable: true });\n  return ctor;\n}\n\n// eslint-disable-next-line no-redeclare\nconst DOMException: DOMExceptionConstructor =\n  isDOMExceptionConstructor(NativeDOMException) ? NativeDOMException : createDOMExceptionPolyfill();\n\nexport { DOMException };\n","import { IsReadableStream, IsReadableStreamLocked, ReadableStream, ReadableStreamCancel } from '../readable-stream';\nimport { AcquireReadableStreamDefaultReader, ReadableStreamDefaultReaderRead } from './default-reader';\nimport { ReadableStreamReaderGenericRelease } from './generic-reader';\nimport {\n  AcquireWritableStreamDefaultWriter,\n  IsWritableStream,\n  IsWritableStreamLocked,\n  WritableStream,\n  WritableStreamAbort,\n  WritableStreamCloseQueuedOrInFlight,\n  WritableStreamDefaultWriterCloseWithErrorPropagation,\n  WritableStreamDefaultWriterRelease,\n  WritableStreamDefaultWriterWrite\n} from '../writable-stream';\nimport assert from '../../stub/assert';\nimport {\n  newPromise,\n  PerformPromiseThen,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  uponFulfillment,\n  uponPromise,\n  uponRejection\n} from '../helpers/webidl';\nimport { noop } from '../../utils';\nimport { AbortSignal, isAbortSignal } from '../abort-signal';\nimport { DOMException } from '../../stub/dom-exception';\n\nexport function ReadableStreamPipeTo<T>(source: ReadableStream<T>,\n                                        dest: WritableStream<T>,\n                                        preventClose: boolean,\n                                        preventAbort: boolean,\n                                        preventCancel: boolean,\n                                        signal: AbortSignal | undefined): Promise<undefined> {\n  assert(IsReadableStream(source));\n  assert(IsWritableStream(dest));\n  assert(typeof preventClose === 'boolean');\n  assert(typeof preventAbort === 'boolean');\n  assert(typeof preventCancel === 'boolean');\n  assert(signal === undefined || isAbortSignal(signal));\n  assert(!IsReadableStreamLocked(source));\n  assert(!IsWritableStreamLocked(dest));\n\n  const reader = AcquireReadableStreamDefaultReader<T>(source);\n  const writer = AcquireWritableStreamDefaultWriter<T>(dest);\n\n  source._disturbed = true;\n\n  let shuttingDown = false;\n\n  // This is used to keep track of the spec's requirement that we wait for ongoing writes during shutdown.\n  let currentWrite = promiseResolvedWith<void>(undefined);\n\n  return newPromise((resolve, reject) => {\n    let abortAlgorithm: () => void;\n    if (signal !== undefined) {\n      abortAlgorithm = () => {\n        const error = new DOMException('Aborted', 'AbortError');\n        const actions: Array<() => Promise<void>> = [];\n        if (!preventAbort) {\n          actions.push(() => {\n            if (dest._state === 'writable') {\n              return WritableStreamAbort(dest, error);\n            }\n            return promiseResolvedWith(undefined);\n          });\n        }\n        if (!preventCancel) {\n          actions.push(() => {\n            if (source._state === 'readable') {\n              return ReadableStreamCancel(source, error);\n            }\n            return promiseResolvedWith(undefined);\n          });\n        }\n        shutdownWithAction(() => Promise.all(actions.map(action => action())), true, error);\n      };\n\n      if (signal.aborted) {\n        abortAlgorithm();\n        return;\n      }\n\n      signal.addEventListener('abort', abortAlgorithm);\n    }\n\n    // Using reader and writer, read all chunks from this and write them to dest\n    // - Backpressure must be enforced\n    // - Shutdown must stop all activity\n    function pipeLoop() {\n      return newPromise<void>((resolveLoop, rejectLoop) => {\n        function next(done: boolean) {\n          if (done) {\n            resolveLoop();\n          } else {\n            // Use `PerformPromiseThen` instead of `uponPromise` to avoid\n            // adding unnecessary `.catch(rethrowAssertionErrorRejection)` handlers\n            PerformPromiseThen(pipeStep(), next, rejectLoop);\n          }\n        }\n\n        next(false);\n      });\n    }\n\n    function pipeStep(): Promise<boolean> {\n      if (shuttingDown) {\n        return promiseResolvedWith(true);\n      }\n\n      return PerformPromiseThen(writer._readyPromise, () => {\n        return newPromise<boolean>((resolveRead, rejectRead) => {\n          ReadableStreamDefaultReaderRead(\n            reader,\n            {\n              _chunkSteps: chunk => {\n                currentWrite = PerformPromiseThen(WritableStreamDefaultWriterWrite(writer, chunk), undefined, noop);\n                resolveRead(false);\n              },\n              _closeSteps: () => resolveRead(true),\n              _errorSteps: rejectRead\n            }\n          );\n        });\n      });\n    }\n\n    // Errors must be propagated forward\n    isOrBecomesErrored(source, reader._closedPromise, storedError => {\n      if (!preventAbort) {\n        shutdownWithAction(() => WritableStreamAbort(dest, storedError), true, storedError);\n      } else {\n        shutdown(true, storedError);\n      }\n    });\n\n    // Errors must be propagated backward\n    isOrBecomesErrored(dest, writer._closedPromise, storedError => {\n      if (!preventCancel) {\n        shutdownWithAction(() => ReadableStreamCancel(source, storedError), true, storedError);\n      } else {\n        shutdown(true, storedError);\n      }\n    });\n\n    // Closing must be propagated forward\n    isOrBecomesClosed(source, reader._closedPromise, () => {\n      if (!preventClose) {\n        shutdownWithAction(() => WritableStreamDefaultWriterCloseWithErrorPropagation(writer));\n      } else {\n        shutdown();\n      }\n    });\n\n    // Closing must be propagated backward\n    if (WritableStreamCloseQueuedOrInFlight(dest) || dest._state === 'closed') {\n      const destClosed = new TypeError('the destination writable stream closed before all data could be piped to it');\n\n      if (!preventCancel) {\n        shutdownWithAction(() => ReadableStreamCancel(source, destClosed), true, destClosed);\n      } else {\n        shutdown(true, destClosed);\n      }\n    }\n\n    setPromiseIsHandledToTrue(pipeLoop());\n\n    function waitForWritesToFinish(): Promise<void> {\n      // Another write may have started while we were waiting on this currentWrite, so we have to be sure to wait\n      // for that too.\n      const oldCurrentWrite = currentWrite;\n      return PerformPromiseThen(\n        currentWrite,\n        () => oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined\n      );\n    }\n\n    function isOrBecomesErrored(stream: ReadableStream | WritableStream,\n                                promise: Promise<void>,\n                                action: (reason: any) => void) {\n      if (stream._state === 'errored') {\n        action(stream._storedError);\n      } else {\n        uponRejection(promise, action);\n      }\n    }\n\n    function isOrBecomesClosed(stream: ReadableStream | WritableStream, promise: Promise<void>, action: () => void) {\n      if (stream._state === 'closed') {\n        action();\n      } else {\n        uponFulfillment(promise, action);\n      }\n    }\n\n    function shutdownWithAction(action: () => Promise<unknown>, originalIsError?: boolean, originalError?: any) {\n      if (shuttingDown) {\n        return;\n      }\n      shuttingDown = true;\n\n      if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {\n        uponFulfillment(waitForWritesToFinish(), doTheRest);\n      } else {\n        doTheRest();\n      }\n\n      function doTheRest() {\n        uponPromise(\n          action(),\n          () => finalize(originalIsError, originalError),\n          newError => finalize(true, newError)\n        );\n      }\n    }\n\n    function shutdown(isError?: boolean, error?: any) {\n      if (shuttingDown) {\n        return;\n      }\n      shuttingDown = true;\n\n      if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {\n        uponFulfillment(waitForWritesToFinish(), () => finalize(isError, error));\n      } else {\n        finalize(isError, error);\n      }\n    }\n\n    function finalize(isError?: boolean, error?: any) {\n      WritableStreamDefaultWriterRelease(writer);\n      ReadableStreamReaderGenericRelease(reader);\n\n      if (signal !== undefined) {\n        signal.removeEventListener('abort', abortAlgorithm);\n      }\n      if (isError) {\n        reject(error);\n      } else {\n        resolve(undefined);\n      }\n    }\n  });\n}\n","import { QueuingStrategySizeCallback } from '../queuing-strategy';\nimport assert from '../../stub/assert';\nimport { DequeueValue, EnqueueValueWithSize, QueuePair, ResetQueue } from '../abstract-ops/queue-with-sizes';\nimport {\n  ReadableStreamAddReadRequest,\n  ReadableStreamFulfillReadRequest,\n  ReadableStreamGetNumReadRequests,\n  ReadRequest\n} from './default-reader';\nimport { SimpleQueue } from '../simple-queue';\nimport { IsReadableStreamLocked, ReadableStream, ReadableStreamClose, ReadableStreamError } from '../readable-stream';\nimport { ValidatedUnderlyingSource } from './underlying-source';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { CancelSteps, PullSteps } from '../abstract-ops/internal-methods';\nimport { promiseResolvedWith, uponPromise } from '../helpers/webidl';\n\n/**\n * Allows control of a {@link ReadableStream | readable stream}'s state and internal queue.\n *\n * @public\n */\nexport class ReadableStreamDefaultController<R> {\n  /** @internal */\n  _controlledReadableStream!: ReadableStream<R>;\n  /** @internal */\n  _queue!: SimpleQueue<QueuePair<R>>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _closeRequested!: boolean;\n  /** @internal */\n  _pullAgain!: boolean;\n  /** @internal */\n  _pulling !: boolean;\n  /** @internal */\n  _strategySizeAlgorithm!: QueuingStrategySizeCallback<R>;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _pullAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _cancelAlgorithm!: (reason: any) => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is\n   * over-full. An underlying source ought to use this information to determine when and how to apply backpressure.\n   */\n  get desiredSize(): number | null {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('desiredSize');\n    }\n\n    return ReadableStreamDefaultControllerGetDesiredSize(this);\n  }\n\n  /**\n   * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from\n   * the stream, but once those are read, the stream will become closed.\n   */\n  close(): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('close');\n    }\n\n    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {\n      throw new TypeError('The stream is not in a state that permits close');\n    }\n\n    ReadableStreamDefaultControllerClose(this);\n  }\n\n  /**\n   * Enqueues the given chunk `chunk` in the controlled readable stream.\n   */\n  enqueue(chunk: R): void;\n  enqueue(chunk: R = undefined!): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('enqueue');\n    }\n\n    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {\n      throw new TypeError('The stream is not in a state that permits enqueue');\n    }\n\n    return ReadableStreamDefaultControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.\n   */\n  error(e: any = undefined): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n\n    ReadableStreamDefaultControllerError(this, e);\n  }\n\n  /** @internal */\n  [CancelSteps](reason: any): Promise<void> {\n    ResetQueue(this);\n    const result = this._cancelAlgorithm(reason);\n    ReadableStreamDefaultControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [PullSteps](readRequest: ReadRequest<R>): void {\n    const stream = this._controlledReadableStream;\n\n    if (this._queue.length > 0) {\n      const chunk = DequeueValue(this);\n\n      if (this._closeRequested && this._queue.length === 0) {\n        ReadableStreamDefaultControllerClearAlgorithms(this);\n        ReadableStreamClose(stream);\n      } else {\n        ReadableStreamDefaultControllerCallPullIfNeeded(this);\n      }\n\n      readRequest._chunkSteps(chunk);\n    } else {\n      ReadableStreamAddReadRequest(stream, readRequest);\n      ReadableStreamDefaultControllerCallPullIfNeeded(this);\n    }\n  }\n}\n\nObject.defineProperties(ReadableStreamDefaultController.prototype, {\n  close: { enumerable: true },\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Abstract operations for the ReadableStreamDefaultController.\n\nfunction IsReadableStreamDefaultController<R = any>(x: any): x is ReadableStreamDefaultController<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableStream')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamDefaultController;\n}\n\nfunction ReadableStreamDefaultControllerCallPullIfNeeded(controller: ReadableStreamDefaultController<any>): void {\n  const shouldPull = ReadableStreamDefaultControllerShouldCallPull(controller);\n  if (!shouldPull) {\n    return;\n  }\n\n  if (controller._pulling) {\n    controller._pullAgain = true;\n    return;\n  }\n\n  assert(!controller._pullAgain);\n\n  controller._pulling = true;\n\n  const pullPromise = controller._pullAlgorithm();\n  uponPromise(\n    pullPromise,\n    () => {\n      controller._pulling = false;\n\n      if (controller._pullAgain) {\n        controller._pullAgain = false;\n        ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n      }\n    },\n    e => {\n      ReadableStreamDefaultControllerError(controller, e);\n    }\n  );\n}\n\nfunction ReadableStreamDefaultControllerShouldCallPull(controller: ReadableStreamDefaultController<any>): boolean {\n  const stream = controller._controlledReadableStream;\n\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return false;\n  }\n\n  if (!controller._started) {\n    return false;\n  }\n\n  if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    return true;\n  }\n\n  const desiredSize = ReadableStreamDefaultControllerGetDesiredSize(controller);\n  assert(desiredSize !== null);\n  if (desiredSize! > 0) {\n    return true;\n  }\n\n  return false;\n}\n\nfunction ReadableStreamDefaultControllerClearAlgorithms(controller: ReadableStreamDefaultController<any>) {\n  controller._pullAlgorithm = undefined!;\n  controller._cancelAlgorithm = undefined!;\n  controller._strategySizeAlgorithm = undefined!;\n}\n\n// A client of ReadableStreamDefaultController may use these functions directly to bypass state check.\n\nexport function ReadableStreamDefaultControllerClose(controller: ReadableStreamDefaultController<any>) {\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return;\n  }\n\n  const stream = controller._controlledReadableStream;\n\n  controller._closeRequested = true;\n\n  if (controller._queue.length === 0) {\n    ReadableStreamDefaultControllerClearAlgorithms(controller);\n    ReadableStreamClose(stream);\n  }\n}\n\nexport function ReadableStreamDefaultControllerEnqueue<R>(\n  controller: ReadableStreamDefaultController<R>,\n  chunk: R\n): void {\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return;\n  }\n\n  const stream = controller._controlledReadableStream;\n\n  if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    ReadableStreamFulfillReadRequest(stream, chunk, false);\n  } else {\n    let chunkSize;\n    try {\n      chunkSize = controller._strategySizeAlgorithm(chunk);\n    } catch (chunkSizeE) {\n      ReadableStreamDefaultControllerError(controller, chunkSizeE);\n      throw chunkSizeE;\n    }\n\n    try {\n      EnqueueValueWithSize(controller, chunk, chunkSize);\n    } catch (enqueueE) {\n      ReadableStreamDefaultControllerError(controller, enqueueE);\n      throw enqueueE;\n    }\n  }\n\n  ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n}\n\nexport function ReadableStreamDefaultControllerError(controller: ReadableStreamDefaultController<any>, e: any) {\n  const stream = controller._controlledReadableStream;\n\n  if (stream._state !== 'readable') {\n    return;\n  }\n\n  ResetQueue(controller);\n\n  ReadableStreamDefaultControllerClearAlgorithms(controller);\n  ReadableStreamError(stream, e);\n}\n\nexport function ReadableStreamDefaultControllerGetDesiredSize(\n  controller: ReadableStreamDefaultController<any>\n): number | null {\n  const state = controller._controlledReadableStream._state;\n\n  if (state === 'errored') {\n    return null;\n  }\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\n// This is used in the implementation of TransformStream.\nexport function ReadableStreamDefaultControllerHasBackpressure(\n  controller: ReadableStreamDefaultController<any>\n): boolean {\n  if (ReadableStreamDefaultControllerShouldCallPull(controller)) {\n    return false;\n  }\n\n  return true;\n}\n\nexport function ReadableStreamDefaultControllerCanCloseOrEnqueue(\n  controller: ReadableStreamDefaultController<any>\n): boolean {\n  const state = controller._controlledReadableStream._state;\n\n  if (!controller._closeRequested && state === 'readable') {\n    return true;\n  }\n\n  return false;\n}\n\nexport function SetUpReadableStreamDefaultController<R>(stream: ReadableStream<R>,\n                                                        controller: ReadableStreamDefaultController<R>,\n                                                        startAlgorithm: () => void | PromiseLike<void>,\n                                                        pullAlgorithm: () => Promise<void>,\n                                                        cancelAlgorithm: (reason: any) => Promise<void>,\n                                                        highWaterMark: number,\n                                                        sizeAlgorithm: QueuingStrategySizeCallback<R>) {\n  assert(stream._readableStreamController === undefined);\n\n  controller._controlledReadableStream = stream;\n\n  controller._queue = undefined!;\n  controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._started = false;\n  controller._closeRequested = false;\n  controller._pullAgain = false;\n  controller._pulling = false;\n\n  controller._strategySizeAlgorithm = sizeAlgorithm;\n  controller._strategyHWM = highWaterMark;\n\n  controller._pullAlgorithm = pullAlgorithm;\n  controller._cancelAlgorithm = cancelAlgorithm;\n\n  stream._readableStreamController = controller;\n\n  const startResult = startAlgorithm();\n  uponPromise(\n    promiseResolvedWith(startResult),\n    () => {\n      controller._started = true;\n\n      assert(!controller._pulling);\n      assert(!controller._pullAgain);\n\n      ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n    },\n    r => {\n      ReadableStreamDefaultControllerError(controller, r);\n    }\n  );\n}\n\nexport function SetUpReadableStreamDefaultControllerFromUnderlyingSource<R>(\n  stream: ReadableStream<R>,\n  underlyingSource: ValidatedUnderlyingSource<R>,\n  highWaterMark: number,\n  sizeAlgorithm: QueuingStrategySizeCallback<R>\n) {\n  const controller: ReadableStreamDefaultController<R> = Object.create(ReadableStreamDefaultController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let pullAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let cancelAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingSource.start !== undefined) {\n    startAlgorithm = () => underlyingSource.start!(controller);\n  }\n  if (underlyingSource.pull !== undefined) {\n    pullAlgorithm = () => underlyingSource.pull!(controller);\n  }\n  if (underlyingSource.cancel !== undefined) {\n    cancelAlgorithm = reason => underlyingSource.cancel!(reason);\n  }\n\n  SetUpReadableStreamDefaultController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm\n  );\n}\n\n// Helper functions for the ReadableStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamDefaultController.prototype.${name} can only be used on a ReadableStreamDefaultController`);\n}\n","import {\n  CreateReadableByteStream,\n  CreateReadableStream,\n  IsReadableStream,\n  ReadableByteStream,\n  ReadableStream,\n  ReadableStreamCancel,\n  ReadableStreamReader\n} from '../readable-stream';\nimport { ReadableStreamReaderGenericRelease } from './generic-reader';\nimport {\n  AcquireReadableStreamDefaultReader,\n  IsReadableStreamDefaultReader,\n  ReadableStreamDefaultReaderRead,\n  ReadRequest\n} from './default-reader';\nimport {\n  AcquireReadableStreamBYOBReader,\n  IsReadableStreamBYOBReader,\n  ReadableStreamBYOBReaderRead,\n  ReadIntoRequest\n} from './byob-reader';\nimport assert from '../../stub/assert';\nimport { newPromise, promiseResolvedWith, queueMicrotask, uponRejection } from '../helpers/webidl';\nimport {\n  ReadableStreamDefaultController,\n  ReadableStreamDefaultControllerClose,\n  ReadableStreamDefaultControllerEnqueue,\n  ReadableStreamDefaultControllerError\n} from './default-controller';\nimport {\n  IsReadableByteStreamController,\n  ReadableByteStreamControllerClose,\n  ReadableByteStreamControllerEnqueue,\n  ReadableByteStreamControllerError,\n  ReadableByteStreamControllerGetBYOBRequest,\n  ReadableByteStreamControllerRespond,\n  ReadableByteStreamControllerRespondWithNewView\n} from './byte-stream-controller';\nimport { CreateArrayFromList } from '../abstract-ops/ecmascript';\nimport { CloneAsUint8Array } from '../abstract-ops/miscellaneous';\n\nexport function ReadableStreamTee<R>(stream: ReadableStream<R>,\n                                     cloneForBranch2: boolean): [ReadableStream<R>, ReadableStream<R>] {\n  assert(IsReadableStream(stream));\n  assert(typeof cloneForBranch2 === 'boolean');\n  if (IsReadableByteStreamController(stream._readableStreamController)) {\n    return ReadableByteStreamTee(stream as unknown as ReadableByteStream) as\n      unknown as [ReadableStream<R>, ReadableStream<R>];\n  }\n  return ReadableStreamDefaultTee(stream, cloneForBranch2);\n}\n\nexport function ReadableStreamDefaultTee<R>(stream: ReadableStream<R>,\n                                            cloneForBranch2: boolean): [ReadableStream<R>, ReadableStream<R>] {\n  assert(IsReadableStream(stream));\n  assert(typeof cloneForBranch2 === 'boolean');\n\n  const reader = AcquireReadableStreamDefaultReader<R>(stream);\n\n  let reading = false;\n  let readAgain = false;\n  let canceled1 = false;\n  let canceled2 = false;\n  let reason1: any;\n  let reason2: any;\n  let branch1: ReadableStream<R>;\n  let branch2: ReadableStream<R>;\n\n  let resolveCancelPromise: (value: undefined | Promise<undefined>) => void;\n  const cancelPromise = newPromise<undefined>(resolve => {\n    resolveCancelPromise = resolve;\n  });\n\n  function pullAlgorithm(): Promise<void> {\n    if (reading) {\n      readAgain = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgain = false;\n          const chunk1 = chunk;\n          const chunk2 = chunk;\n\n          // There is no way to access the cloning code right now in the reference implementation.\n          // If we add one then we'll need an implementation for serializable objects.\n          // if (!canceled2 && cloneForBranch2) {\n          //   chunk2 = StructuredDeserialize(StructuredSerialize(chunk2));\n          // }\n\n          if (!canceled1) {\n            ReadableStreamDefaultControllerEnqueue(\n              branch1._readableStreamController as ReadableStreamDefaultController<R>,\n              chunk1\n            );\n          }\n          if (!canceled2) {\n            ReadableStreamDefaultControllerEnqueue(\n              branch2._readableStreamController as ReadableStreamDefaultController<R>,\n              chunk2\n            );\n          }\n\n          reading = false;\n          if (readAgain) {\n            pullAlgorithm();\n          }\n        });\n      },\n      _closeSteps: () => {\n        reading = false;\n        if (!canceled1) {\n          ReadableStreamDefaultControllerClose(branch1._readableStreamController as ReadableStreamDefaultController<R>);\n        }\n        if (!canceled2) {\n          ReadableStreamDefaultControllerClose(branch2._readableStreamController as ReadableStreamDefaultController<R>);\n        }\n\n        if (!canceled1 || !canceled2) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function cancel1Algorithm(reason: any): Promise<void> {\n    canceled1 = true;\n    reason1 = reason;\n    if (canceled2) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function cancel2Algorithm(reason: any): Promise<void> {\n    canceled2 = true;\n    reason2 = reason;\n    if (canceled1) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function startAlgorithm() {\n    // do nothing\n  }\n\n  branch1 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel1Algorithm);\n  branch2 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel2Algorithm);\n\n  uponRejection(reader._closedPromise, (r: any) => {\n    ReadableStreamDefaultControllerError(branch1._readableStreamController as ReadableStreamDefaultController<R>, r);\n    ReadableStreamDefaultControllerError(branch2._readableStreamController as ReadableStreamDefaultController<R>, r);\n    if (!canceled1 || !canceled2) {\n      resolveCancelPromise(undefined);\n    }\n  });\n\n  return [branch1, branch2];\n}\n\nexport function ReadableByteStreamTee(stream: ReadableByteStream): [ReadableByteStream, ReadableByteStream] {\n  assert(IsReadableStream(stream));\n  assert(IsReadableByteStreamController(stream._readableStreamController));\n\n  let reader: ReadableStreamReader<Uint8Array> = AcquireReadableStreamDefaultReader(stream);\n  let reading = false;\n  let readAgainForBranch1 = false;\n  let readAgainForBranch2 = false;\n  let canceled1 = false;\n  let canceled2 = false;\n  let reason1: any;\n  let reason2: any;\n  let branch1: ReadableByteStream;\n  let branch2: ReadableByteStream;\n\n  let resolveCancelPromise: (value: undefined | Promise<undefined>) => void;\n  const cancelPromise = newPromise<void>(resolve => {\n    resolveCancelPromise = resolve;\n  });\n\n  function forwardReaderError(thisReader: ReadableStreamReader<Uint8Array>) {\n    uponRejection(thisReader._closedPromise, r => {\n      if (thisReader !== reader) {\n        return;\n      }\n      ReadableByteStreamControllerError(branch1._readableStreamController, r);\n      ReadableByteStreamControllerError(branch2._readableStreamController, r);\n      if (!canceled1 || !canceled2) {\n        resolveCancelPromise(undefined);\n      }\n    });\n  }\n\n  function pullWithDefaultReader() {\n    if (IsReadableStreamBYOBReader(reader)) {\n      assert(reader._readIntoRequests.length === 0);\n      ReadableStreamReaderGenericRelease(reader);\n\n      reader = AcquireReadableStreamDefaultReader(stream);\n      forwardReaderError(reader);\n    }\n\n    const readRequest: ReadRequest<Uint8Array> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgainForBranch1 = false;\n          readAgainForBranch2 = false;\n\n          const chunk1 = chunk;\n          let chunk2 = chunk;\n          if (!canceled1 && !canceled2) {\n            try {\n              chunk2 = CloneAsUint8Array(chunk);\n            } catch (cloneE) {\n              ReadableByteStreamControllerError(branch1._readableStreamController, cloneE);\n              ReadableByteStreamControllerError(branch2._readableStreamController, cloneE);\n              resolveCancelPromise(ReadableStreamCancel(stream, cloneE));\n              return;\n            }\n          }\n\n          if (!canceled1) {\n            ReadableByteStreamControllerEnqueue(branch1._readableStreamController, chunk1);\n          }\n          if (!canceled2) {\n            ReadableByteStreamControllerEnqueue(branch2._readableStreamController, chunk2);\n          }\n\n          reading = false;\n          if (readAgainForBranch1) {\n            pull1Algorithm();\n          } else if (readAgainForBranch2) {\n            pull2Algorithm();\n          }\n        });\n      },\n      _closeSteps: () => {\n        reading = false;\n        if (!canceled1) {\n          ReadableByteStreamControllerClose(branch1._readableStreamController);\n        }\n        if (!canceled2) {\n          ReadableByteStreamControllerClose(branch2._readableStreamController);\n        }\n        if (branch1._readableStreamController._pendingPullIntos.length > 0) {\n          ReadableByteStreamControllerRespond(branch1._readableStreamController, 0);\n        }\n        if (branch2._readableStreamController._pendingPullIntos.length > 0) {\n          ReadableByteStreamControllerRespond(branch2._readableStreamController, 0);\n        }\n        if (!canceled1 || !canceled2) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n  }\n\n  function pullWithBYOBReader(view: ArrayBufferView, forBranch2: boolean) {\n    if (IsReadableStreamDefaultReader<Uint8Array>(reader)) {\n      assert(reader._readRequests.length === 0);\n      ReadableStreamReaderGenericRelease(reader);\n\n      reader = AcquireReadableStreamBYOBReader(stream);\n      forwardReaderError(reader);\n    }\n\n    const byobBranch = forBranch2 ? branch2 : branch1;\n    const otherBranch = forBranch2 ? branch1 : branch2;\n\n    const readIntoRequest: ReadIntoRequest<ArrayBufferView> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgainForBranch1 = false;\n          readAgainForBranch2 = false;\n\n          const byobCanceled = forBranch2 ? canceled2 : canceled1;\n          const otherCanceled = forBranch2 ? canceled1 : canceled2;\n\n          if (!otherCanceled) {\n            let clonedChunk;\n            try {\n              clonedChunk = CloneAsUint8Array(chunk);\n            } catch (cloneE) {\n              ReadableByteStreamControllerError(byobBranch._readableStreamController, cloneE);\n              ReadableByteStreamControllerError(otherBranch._readableStreamController, cloneE);\n              resolveCancelPromise(ReadableStreamCancel(stream, cloneE));\n              return;\n            }\n            if (!byobCanceled) {\n              ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n            }\n            ReadableByteStreamControllerEnqueue(otherBranch._readableStreamController, clonedChunk);\n          } else if (!byobCanceled) {\n            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n          }\n\n          reading = false;\n          if (readAgainForBranch1) {\n            pull1Algorithm();\n          } else if (readAgainForBranch2) {\n            pull2Algorithm();\n          }\n        });\n      },\n      _closeSteps: chunk => {\n        reading = false;\n\n        const byobCanceled = forBranch2 ? canceled2 : canceled1;\n        const otherCanceled = forBranch2 ? canceled1 : canceled2;\n\n        if (!byobCanceled) {\n          ReadableByteStreamControllerClose(byobBranch._readableStreamController);\n        }\n        if (!otherCanceled) {\n          ReadableByteStreamControllerClose(otherBranch._readableStreamController);\n        }\n\n        if (chunk !== undefined) {\n          assert(chunk.byteLength === 0);\n\n          if (!byobCanceled) {\n            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n          }\n          if (!otherCanceled && otherBranch._readableStreamController._pendingPullIntos.length > 0) {\n            ReadableByteStreamControllerRespond(otherBranch._readableStreamController, 0);\n          }\n        }\n\n        if (!byobCanceled || !otherCanceled) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamBYOBReaderRead(reader, view, readIntoRequest);\n  }\n\n  function pull1Algorithm(): Promise<void> {\n    if (reading) {\n      readAgainForBranch1 = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch1._readableStreamController);\n    if (byobRequest === null) {\n      pullWithDefaultReader();\n    } else {\n      pullWithBYOBReader(byobRequest._view!, false);\n    }\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function pull2Algorithm(): Promise<void> {\n    if (reading) {\n      readAgainForBranch2 = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch2._readableStreamController);\n    if (byobRequest === null) {\n      pullWithDefaultReader();\n    } else {\n      pullWithBYOBReader(byobRequest._view!, true);\n    }\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function cancel1Algorithm(reason: any): Promise<void> {\n    canceled1 = true;\n    reason1 = reason;\n    if (canceled2) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function cancel2Algorithm(reason: any): Promise<void> {\n    canceled2 = true;\n    reason2 = reason;\n    if (canceled1) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function startAlgorithm(): void {\n    return;\n  }\n\n  branch1 = CreateReadableByteStream(startAlgorithm, pull1Algorithm, cancel1Algorithm);\n  branch2 = CreateReadableByteStream(startAlgorithm, pull2Algorithm, cancel2Algorithm);\n\n  forwardReaderError(reader);\n\n  return [branch1, branch2];\n}\n","import { assertDictionary, assertFunction, convertUnsignedLongLongWithEnforceRange } from './basic';\nimport {\n  ReadableStreamController,\n  UnderlyingByteSource,\n  UnderlyingDefaultOrByteSource,\n  UnderlyingDefaultOrByteSourcePullCallback,\n  UnderlyingDefaultOrByteSourceStartCallback,\n  UnderlyingSource,\n  UnderlyingSourceCancelCallback,\n  ValidatedUnderlyingDefaultOrByteSource\n} from '../readable-stream/underlying-source';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\n\nexport function convertUnderlyingDefaultOrByteSource<R>(\n  source: UnderlyingSource<R> | UnderlyingByteSource | null,\n  context: string\n): ValidatedUnderlyingDefaultOrByteSource<R> {\n  assertDictionary(source, context);\n  const original = source as (UnderlyingDefaultOrByteSource<R> | null);\n  const autoAllocateChunkSize = original?.autoAllocateChunkSize;\n  const cancel = original?.cancel;\n  const pull = original?.pull;\n  const start = original?.start;\n  const type = original?.type;\n  return {\n    autoAllocateChunkSize: autoAllocateChunkSize === undefined ?\n      undefined :\n      convertUnsignedLongLongWithEnforceRange(\n        autoAllocateChunkSize,\n        `${context} has member 'autoAllocateChunkSize' that`\n      ),\n    cancel: cancel === undefined ?\n      undefined :\n      convertUnderlyingSourceCancelCallback(cancel, original!, `${context} has member 'cancel' that`),\n    pull: pull === undefined ?\n      undefined :\n      convertUnderlyingSourcePullCallback(pull, original!, `${context} has member 'pull' that`),\n    start: start === undefined ?\n      undefined :\n      convertUnderlyingSourceStartCallback(start, original!, `${context} has member 'start' that`),\n    type: type === undefined ? undefined : convertReadableStreamType(type, `${context} has member 'type' that`)\n  };\n}\n\nfunction convertUnderlyingSourceCancelCallback(\n  fn: UnderlyingSourceCancelCallback,\n  original: UnderlyingDefaultOrByteSource,\n  context: string\n): (reason: any) => Promise<void> {\n  assertFunction(fn, context);\n  return (reason: any) => promiseCall(fn, original, [reason]);\n}\n\nfunction convertUnderlyingSourcePullCallback<R>(\n  fn: UnderlyingDefaultOrByteSourcePullCallback<R>,\n  original: UnderlyingDefaultOrByteSource<R>,\n  context: string\n): (controller: ReadableStreamController<R>) => Promise<void> {\n  assertFunction(fn, context);\n  return (controller: ReadableStreamController<R>) => promiseCall(fn, original, [controller]);\n}\n\nfunction convertUnderlyingSourceStartCallback<R>(\n  fn: UnderlyingDefaultOrByteSourceStartCallback<R>,\n  original: UnderlyingDefaultOrByteSource<R>,\n  context: string\n): UnderlyingDefaultOrByteSourceStartCallback<R> {\n  assertFunction(fn, context);\n  return (controller: ReadableStreamController<R>) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertReadableStreamType(type: string, context: string): 'bytes' {\n  type = `${type}`;\n  if (type !== 'bytes') {\n    throw new TypeError(`${context} '${type}' is not a valid enumeration value for ReadableStreamType`);\n  }\n  return type;\n}\n","import { assertDictionary } from './basic';\nimport { ReadableStreamGetReaderOptions } from '../readable-stream/reader-options';\n\nexport function convertReaderOptions(options: ReadableStreamGetReaderOptions | null | undefined,\n                                     context: string): ReadableStreamGetReaderOptions {\n  assertDictionary(options, context);\n  const mode = options?.mode;\n  return {\n    mode: mode === undefined ? undefined : convertReadableStreamReaderMode(mode, `${context} has member 'mode' that`)\n  };\n}\n\nfunction convertReadableStreamReaderMode(mode: string, context: string): 'byob' {\n  mode = `${mode}`;\n  if (mode !== 'byob') {\n    throw new TypeError(`${context} '${mode}' is not a valid enumeration value for ReadableStreamReaderMode`);\n  }\n  return mode;\n}\n","import { assertDictionary } from './basic';\nimport { StreamPipeOptions, ValidatedStreamPipeOptions } from '../readable-stream/pipe-options';\nimport { AbortSignal, isAbortSignal } from '../abort-signal';\n\nexport function convertPipeOptions(options: StreamPipeOptions | null | undefined,\n                                   context: string): ValidatedStreamPipeOptions {\n  assertDictionary(options, context);\n  const preventAbort = options?.preventAbort;\n  const preventCancel = options?.preventCancel;\n  const preventClose = options?.preventClose;\n  const signal = options?.signal;\n  if (signal !== undefined) {\n    assertAbortSignal(signal, `${context} has member 'signal' that`);\n  }\n  return {\n    preventAbort: Boolean(preventAbort),\n    preventCancel: Boolean(preventCancel),\n    preventClose: Boolean(preventClose),\n    signal\n  };\n}\n\nfunction assertAbortSignal(signal: unknown, context: string): asserts signal is AbortSignal {\n  if (!isAbortSignal(signal)) {\n    throw new TypeError(`${context} is not an AbortSignal.`);\n  }\n}\n","import assert from '../stub/assert';\nimport {\n  promiseRejectedWith,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  transformPromiseWith\n} from './helpers/webidl';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { AcquireReadableStreamAsyncIterator, ReadableStreamAsyncIterator } from './readable-stream/async-iterator';\nimport { defaultReaderClosedPromiseReject, defaultReaderClosedPromiseResolve } from './readable-stream/generic-reader';\nimport {\n  AcquireReadableStreamDefaultReader,\n  IsReadableStreamDefaultReader,\n  ReadableStreamDefaultReader,\n  ReadableStreamDefaultReadResult\n} from './readable-stream/default-reader';\nimport {\n  AcquireReadableStreamBYOBReader,\n  IsReadableStreamBYOBReader,\n  ReadableStreamBYOBReader,\n  ReadableStreamBYOBReadResult\n} from './readable-stream/byob-reader';\nimport { ReadableStreamPipeTo } from './readable-stream/pipe';\nimport { ReadableStreamTee } from './readable-stream/tee';\nimport { IsWritableStream, IsWritableStreamLocked, WritableStream } from './writable-stream';\nimport { SimpleQueue } from './simple-queue';\nimport {\n  ReadableByteStreamController,\n  ReadableStreamBYOBRequest,\n  SetUpReadableByteStreamController,\n  SetUpReadableByteStreamControllerFromUnderlyingSource\n} from './readable-stream/byte-stream-controller';\nimport {\n  ReadableStreamDefaultController,\n  SetUpReadableStreamDefaultController,\n  SetUpReadableStreamDefaultControllerFromUnderlyingSource\n} from './readable-stream/default-controller';\nimport {\n  UnderlyingByteSource,\n  UnderlyingByteSourcePullCallback,\n  UnderlyingByteSourceStartCallback,\n  UnderlyingSource,\n  UnderlyingSourceCancelCallback,\n  UnderlyingSourcePullCallback,\n  UnderlyingSourceStartCallback\n} from './readable-stream/underlying-source';\nimport { noop } from '../utils';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { CreateArrayFromList } from './abstract-ops/ecmascript';\nimport { CancelSteps } from './abstract-ops/internal-methods';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { assertObject, assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport { convertUnderlyingDefaultOrByteSource } from './validators/underlying-source';\nimport { ReadableStreamGetReaderOptions } from './readable-stream/reader-options';\nimport { convertReaderOptions } from './validators/reader-options';\nimport { StreamPipeOptions, ValidatedStreamPipeOptions } from './readable-stream/pipe-options';\nimport { ReadableStreamIteratorOptions } from './readable-stream/iterator-options';\nimport { convertIteratorOptions } from './validators/iterator-options';\nimport { convertPipeOptions } from './validators/pipe-options';\nimport { ReadableWritablePair } from './readable-stream/readable-writable-pair';\nimport { convertReadableWritablePair } from './validators/readable-writable-pair';\n\nexport type ReadableByteStream = ReadableStream<Uint8Array> & {\n  _readableStreamController: ReadableByteStreamController\n};\n\ntype ReadableStreamState = 'readable' | 'closed' | 'errored';\n\n/**\n * A readable stream represents a source of data, from which you can read.\n *\n * @public\n */\nexport class ReadableStream<R = any> {\n  /** @internal */\n  _state!: ReadableStreamState;\n  /** @internal */\n  _reader: ReadableStreamReader<R> | undefined;\n  /** @internal */\n  _storedError: any;\n  /** @internal */\n  _disturbed!: boolean;\n  /** @internal */\n  _readableStreamController!: ReadableStreamDefaultController<R> | ReadableByteStreamController;\n\n  constructor(underlyingSource: UnderlyingByteSource, strategy?: { highWaterMark?: number; size?: undefined });\n  constructor(underlyingSource?: UnderlyingSource<R>, strategy?: QueuingStrategy<R>);\n  constructor(rawUnderlyingSource: UnderlyingSource<R> | UnderlyingByteSource | null | undefined = {},\n              rawStrategy: QueuingStrategy<R> | null | undefined = {}) {\n    if (rawUnderlyingSource === undefined) {\n      rawUnderlyingSource = null;\n    } else {\n      assertObject(rawUnderlyingSource, 'First parameter');\n    }\n\n    const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');\n    const underlyingSource = convertUnderlyingDefaultOrByteSource(rawUnderlyingSource, 'First parameter');\n\n    InitializeReadableStream(this);\n\n    if (underlyingSource.type === 'bytes') {\n      if (strategy.size !== undefined) {\n        throw new RangeError('The strategy for a byte stream cannot have a size function');\n      }\n      const highWaterMark = ExtractHighWaterMark(strategy, 0);\n      SetUpReadableByteStreamControllerFromUnderlyingSource(\n        this as unknown as ReadableByteStream,\n        underlyingSource,\n        highWaterMark\n      );\n    } else {\n      assert(underlyingSource.type === undefined);\n      const sizeAlgorithm = ExtractSizeAlgorithm(strategy);\n      const highWaterMark = ExtractHighWaterMark(strategy, 1);\n      SetUpReadableStreamDefaultControllerFromUnderlyingSource(\n        this,\n        underlyingSource,\n        highWaterMark,\n        sizeAlgorithm\n      );\n    }\n  }\n\n  /**\n   * Whether or not the readable stream is locked to a {@link ReadableStreamDefaultReader | reader}.\n   */\n  get locked(): boolean {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('locked');\n    }\n\n    return IsReadableStreamLocked(this);\n  }\n\n  /**\n   * Cancels the stream, signaling a loss of interest in the stream by a consumer.\n   *\n   * The supplied `reason` argument will be given to the underlying source's {@link UnderlyingSource.cancel | cancel()}\n   * method, which might or might not use it.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('cancel'));\n    }\n\n    if (IsReadableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot cancel a stream that already has a reader'));\n    }\n\n    return ReadableStreamCancel(this, reason);\n  }\n\n  /**\n   * Creates a {@link ReadableStreamBYOBReader} and locks the stream to the new reader.\n   *\n   * This call behaves the same way as the no-argument variant, except that it only works on readable byte streams,\n   * i.e. streams which were constructed specifically with the ability to handle \"bring your own buffer\" reading.\n   * The returned BYOB reader provides the ability to directly read individual chunks from the stream via its\n   * {@link ReadableStreamBYOBReader.read | read()} method, into developer-supplied buffers, allowing more precise\n   * control over allocation.\n   */\n  getReader({ mode }: { mode: 'byob' }): ReadableStreamBYOBReader;\n  /**\n   * Creates a {@link ReadableStreamDefaultReader} and locks the stream to the new reader.\n   * While the stream is locked, no other reader can be acquired until this one is released.\n   *\n   * This functionality is especially useful for creating abstractions that desire the ability to consume a stream\n   * in its entirety. By getting a reader for the stream, you can ensure nobody else can interleave reads with yours\n   * or cancel the stream, which would interfere with your abstraction.\n   */\n  getReader(): ReadableStreamDefaultReader<R>;\n  getReader(\n    rawOptions: ReadableStreamGetReaderOptions | null | undefined = undefined\n  ): ReadableStreamDefaultReader<R> | ReadableStreamBYOBReader {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('getReader');\n    }\n\n    const options = convertReaderOptions(rawOptions, 'First parameter');\n\n    if (options.mode === undefined) {\n      return AcquireReadableStreamDefaultReader(this);\n    }\n\n    assert(options.mode === 'byob');\n    return AcquireReadableStreamBYOBReader(this as unknown as ReadableByteStream);\n  }\n\n  /**\n   * Provides a convenient, chainable way of piping this readable stream through a transform stream\n   * (or any other `{ writable, readable }` pair). It simply {@link ReadableStream.pipeTo | pipes} the stream\n   * into the writable side of the supplied pair, and returns the readable side for further use.\n   *\n   * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.\n   */\n  pipeThrough<RS extends ReadableStream>(\n    transform: { readable: RS; writable: WritableStream<R> },\n    options?: StreamPipeOptions\n  ): RS;\n  pipeThrough<RS extends ReadableStream>(\n    rawTransform: { readable: RS; writable: WritableStream<R> } | null | undefined,\n    rawOptions: StreamPipeOptions | null | undefined = {}\n  ): RS {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('pipeThrough');\n    }\n    assertRequiredArgument(rawTransform, 1, 'pipeThrough');\n\n    const transform = convertReadableWritablePair(rawTransform, 'First parameter');\n    const options = convertPipeOptions(rawOptions, 'Second parameter');\n\n    if (IsReadableStreamLocked(this)) {\n      throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked ReadableStream');\n    }\n    if (IsWritableStreamLocked(transform.writable)) {\n      throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked WritableStream');\n    }\n\n    const promise = ReadableStreamPipeTo(\n      this, transform.writable, options.preventClose, options.preventAbort, options.preventCancel, options.signal\n    );\n\n    setPromiseIsHandledToTrue(promise);\n\n    return transform.readable;\n  }\n\n  /**\n   * Pipes this readable stream to a given writable stream. The way in which the piping process behaves under\n   * various error conditions can be customized with a number of passed options. It returns a promise that fulfills\n   * when the piping process completes successfully, or rejects if any errors were encountered.\n   *\n   * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.\n   */\n  pipeTo(destination: WritableStream<R>, options?: StreamPipeOptions): Promise<void>;\n  pipeTo(destination: WritableStream<R> | null | undefined,\n         rawOptions: StreamPipeOptions | null | undefined = {}): Promise<void> {\n    if (!IsReadableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('pipeTo'));\n    }\n\n    if (destination === undefined) {\n      return promiseRejectedWith(`Parameter 1 is required in 'pipeTo'.`);\n    }\n    if (!IsWritableStream(destination)) {\n      return promiseRejectedWith(\n        new TypeError(`ReadableStream.prototype.pipeTo's first argument must be a WritableStream`)\n      );\n    }\n\n    let options: ValidatedStreamPipeOptions;\n    try {\n      options = convertPipeOptions(rawOptions, 'Second parameter');\n    } catch (e) {\n      return promiseRejectedWith(e);\n    }\n\n    if (IsReadableStreamLocked(this)) {\n      return promiseRejectedWith(\n        new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream')\n      );\n    }\n    if (IsWritableStreamLocked(destination)) {\n      return promiseRejectedWith(\n        new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream')\n      );\n    }\n\n    return ReadableStreamPipeTo<R>(\n      this, destination, options.preventClose, options.preventAbort, options.preventCancel, options.signal\n    );\n  }\n\n  /**\n   * Tees this readable stream, returning a two-element array containing the two resulting branches as\n   * new {@link ReadableStream} instances.\n   *\n   * Teeing a stream will lock it, preventing any other consumer from acquiring a reader.\n   * To cancel the stream, cancel both of the resulting branches; a composite cancellation reason will then be\n   * propagated to the stream's underlying source.\n   *\n   * Note that the chunks seen in each branch will be the same object. If the chunks are not immutable,\n   * this could allow interference between the two branches.\n   */\n  tee(): [ReadableStream<R>, ReadableStream<R>] {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('tee');\n    }\n\n    const branches = ReadableStreamTee(this, false);\n    return CreateArrayFromList(branches);\n  }\n\n  /**\n   * Asynchronously iterates over the chunks in the stream's internal queue.\n   *\n   * Asynchronously iterating over the stream will lock it, preventing any other consumer from acquiring a reader.\n   * The lock will be released if the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method\n   * is called, e.g. by breaking out of the loop.\n   *\n   * By default, calling the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method will also\n   * cancel the stream. To prevent this, use the stream's {@link ReadableStream.values | values()} method, passing\n   * `true` for the `preventCancel` option.\n   */\n  values(options?: ReadableStreamIteratorOptions): ReadableStreamAsyncIterator<R>;\n  values(rawOptions: ReadableStreamIteratorOptions | null | undefined = undefined): ReadableStreamAsyncIterator<R> {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('values');\n    }\n\n    const options = convertIteratorOptions(rawOptions, 'First parameter');\n    return AcquireReadableStreamAsyncIterator<R>(this, options.preventCancel);\n  }\n\n  /**\n   * {@inheritDoc ReadableStream.values}\n   */\n  [Symbol.asyncIterator]: (options?: ReadableStreamIteratorOptions) => ReadableStreamAsyncIterator<R>;\n}\n\nObject.defineProperties(ReadableStream.prototype, {\n  cancel: { enumerable: true },\n  getReader: { enumerable: true },\n  pipeThrough: { enumerable: true },\n  pipeTo: { enumerable: true },\n  tee: { enumerable: true },\n  values: { enumerable: true },\n  locked: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStream.prototype, Symbol.toStringTag, {\n    value: 'ReadableStream',\n    configurable: true\n  });\n}\nif (typeof Symbol.asyncIterator === 'symbol') {\n  Object.defineProperty(ReadableStream.prototype, Symbol.asyncIterator, {\n    value: ReadableStream.prototype.values,\n    writable: true,\n    configurable: true\n  });\n}\n\nexport {\n  ReadableStreamAsyncIterator,\n  ReadableStreamDefaultReadResult,\n  ReadableStreamBYOBReadResult,\n  UnderlyingByteSource,\n  UnderlyingSource,\n  UnderlyingSourceStartCallback,\n  UnderlyingSourcePullCallback,\n  UnderlyingSourceCancelCallback,\n  UnderlyingByteSourceStartCallback,\n  UnderlyingByteSourcePullCallback,\n  StreamPipeOptions,\n  ReadableWritablePair,\n  ReadableStreamIteratorOptions\n};\n\n// Abstract operations for the ReadableStream.\n\n// Throws if and only if startAlgorithm throws.\nexport function CreateReadableStream<R>(startAlgorithm: () => void | PromiseLike<void>,\n                                        pullAlgorithm: () => Promise<void>,\n                                        cancelAlgorithm: (reason: any) => Promise<void>,\n                                        highWaterMark = 1,\n                                        sizeAlgorithm: QueuingStrategySizeCallback<R> = () => 1): ReadableStream<R> {\n  assert(IsNonNegativeNumber(highWaterMark));\n\n  const stream: ReadableStream<R> = Object.create(ReadableStream.prototype);\n  InitializeReadableStream(stream);\n\n  const controller: ReadableStreamDefaultController<R> = Object.create(ReadableStreamDefaultController.prototype);\n  SetUpReadableStreamDefaultController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm\n  );\n\n  return stream;\n}\n\n// Throws if and only if startAlgorithm throws.\nexport function CreateReadableByteStream(\n  startAlgorithm: () => void | PromiseLike<void>,\n  pullAlgorithm: () => Promise<void>,\n  cancelAlgorithm: (reason: any) => Promise<void>\n): ReadableByteStream {\n  const stream: ReadableByteStream = Object.create(ReadableStream.prototype);\n  InitializeReadableStream(stream);\n\n  const controller: ReadableByteStreamController = Object.create(ReadableByteStreamController.prototype);\n  SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, 0, undefined);\n\n  return stream;\n}\n\nfunction InitializeReadableStream(stream: ReadableStream) {\n  stream._state = 'readable';\n  stream._reader = undefined;\n  stream._storedError = undefined;\n  stream._disturbed = false;\n}\n\nexport function IsReadableStream(x: unknown): x is ReadableStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readableStreamController')) {\n    return false;\n  }\n\n  return x instanceof ReadableStream;\n}\n\nexport function IsReadableStreamDisturbed(stream: ReadableStream): boolean {\n  assert(IsReadableStream(stream));\n\n  return stream._disturbed;\n}\n\nexport function IsReadableStreamLocked(stream: ReadableStream): boolean {\n  assert(IsReadableStream(stream));\n\n  if (stream._reader === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamCancel<R>(stream: ReadableStream<R>, reason: any): Promise<undefined> {\n  stream._disturbed = true;\n\n  if (stream._state === 'closed') {\n    return promiseResolvedWith(undefined);\n  }\n  if (stream._state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  ReadableStreamClose(stream);\n\n  const reader = stream._reader;\n  if (reader !== undefined && IsReadableStreamBYOBReader(reader)) {\n    reader._readIntoRequests.forEach(readIntoRequest => {\n      readIntoRequest._closeSteps(undefined);\n    });\n    reader._readIntoRequests = new SimpleQueue();\n  }\n\n  const sourceCancelPromise = stream._readableStreamController[CancelSteps](reason);\n  return transformPromiseWith(sourceCancelPromise, noop);\n}\n\nexport function ReadableStreamClose<R>(stream: ReadableStream<R>): void {\n  assert(stream._state === 'readable');\n\n  stream._state = 'closed';\n\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return;\n  }\n\n  defaultReaderClosedPromiseResolve(reader);\n\n  if (IsReadableStreamDefaultReader<R>(reader)) {\n    reader._readRequests.forEach(readRequest => {\n      readRequest._closeSteps();\n    });\n    reader._readRequests = new SimpleQueue();\n  }\n}\n\nexport function ReadableStreamError<R>(stream: ReadableStream<R>, e: any): void {\n  assert(IsReadableStream(stream));\n  assert(stream._state === 'readable');\n\n  stream._state = 'errored';\n  stream._storedError = e;\n\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return;\n  }\n\n  defaultReaderClosedPromiseReject(reader, e);\n\n  if (IsReadableStreamDefaultReader<R>(reader)) {\n    reader._readRequests.forEach(readRequest => {\n      readRequest._errorSteps(e);\n    });\n\n    reader._readRequests = new SimpleQueue();\n  } else {\n    assert(IsReadableStreamBYOBReader(reader));\n\n    reader._readIntoRequests.forEach(readIntoRequest => {\n      readIntoRequest._errorSteps(e);\n    });\n\n    reader._readIntoRequests = new SimpleQueue();\n  }\n}\n\n// Readers\n\nexport type ReadableStreamReader<R> = ReadableStreamDefaultReader<R> | ReadableStreamBYOBReader;\n\nexport {\n  ReadableStreamDefaultReader,\n  ReadableStreamBYOBReader\n};\n\n// Controllers\n\nexport {\n  ReadableStreamDefaultController,\n  ReadableStreamBYOBRequest,\n  ReadableByteStreamController\n};\n\n// Helper functions for the ReadableStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(`ReadableStream.prototype.${name} can only be used on a ReadableStream`);\n}\n","import { assertDictionary, assertRequiredField } from './basic';\nimport { ReadableStream } from '../readable-stream';\nimport { WritableStream } from '../writable-stream';\nimport { assertReadableStream } from './readable-stream';\nimport { assertWritableStream } from './writable-stream';\n\nexport function convertReadableWritablePair<RS extends ReadableStream, WS extends WritableStream>(\n  pair: { readable: RS; writable: WS } | null | undefined,\n  context: string\n): { readable: RS; writable: WS } {\n  assertDictionary(pair, context);\n\n  const readable = pair?.readable;\n  assertRequiredField(readable, 'readable', 'ReadableWritablePair');\n  assertReadableStream(readable, `${context} has member 'readable' that`);\n\n  const writable = pair?.writable;\n  assertRequiredField(writable, 'writable', 'ReadableWritablePair');\n  assertWritableStream(writable, `${context} has member 'writable' that`);\n\n  return { readable, writable };\n}\n","import { assertDictionary } from './basic';\nimport {\n  ReadableStreamIteratorOptions,\n  ValidatedReadableStreamIteratorOptions\n} from '../readable-stream/iterator-options';\n\nexport function convertIteratorOptions(options: ReadableStreamIteratorOptions | null | undefined,\n                                       context: string): ValidatedReadableStreamIteratorOptions {\n  assertDictionary(options, context);\n  const preventCancel = options?.preventCancel;\n  return { preventCancel: Boolean(preventCancel) };\n}\n","import { QueuingStrategyInit } from '../queuing-strategy';\nimport { assertDictionary, assertRequiredField, convertUnrestrictedDouble } from './basic';\n\nexport function convertQueuingStrategyInit(init: QueuingStrategyInit | null | undefined,\n                                           context: string): QueuingStrategyInit {\n  assertDictionary(init, context);\n  const highWaterMark = init?.highWaterMark;\n  assertRequiredField(highWaterMark, 'highWaterMark', 'QueuingStrategyInit');\n  return {\n    highWaterMark: convertUnrestrictedDouble(highWaterMark)\n  };\n}\n","import { QueuingStrategy, QueuingStrategyInit } from './queuing-strategy';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategyInit } from './validators/queuing-strategy-init';\n\n// The size function must not have a prototype property nor be a constructor\nconst byteLengthSizeFunction = (chunk: ArrayBufferView): number => {\n  return chunk.byteLength;\n};\ntry {\n  Object.defineProperty(byteLengthSizeFunction, 'name', {\n    value: 'size',\n    configurable: true\n  });\n} catch {\n  // This property is non-configurable in older browsers, so ignore if this throws.\n  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility\n}\n\n/**\n * A queuing strategy that counts the number of bytes in each chunk.\n *\n * @public\n */\nexport default class ByteLengthQueuingStrategy implements QueuingStrategy<ArrayBufferView> {\n  /** @internal */\n  readonly _byteLengthQueuingStrategyHighWaterMark: number;\n\n  constructor(options: QueuingStrategyInit) {\n    assertRequiredArgument(options, 1, 'ByteLengthQueuingStrategy');\n    options = convertQueuingStrategyInit(options, 'First parameter');\n    this._byteLengthQueuingStrategyHighWaterMark = options.highWaterMark;\n  }\n\n  /**\n   * Returns the high water mark provided to the constructor.\n   */\n  get highWaterMark(): number {\n    if (!IsByteLengthQueuingStrategy(this)) {\n      throw byteLengthBrandCheckException('highWaterMark');\n    }\n    return this._byteLengthQueuingStrategyHighWaterMark;\n  }\n\n  /**\n   * Measures the size of `chunk` by returning the value of its `byteLength` property.\n   */\n  get size(): (chunk: ArrayBufferView) => number {\n    if (!IsByteLengthQueuingStrategy(this)) {\n      throw byteLengthBrandCheckException('size');\n    }\n    return byteLengthSizeFunction;\n  }\n}\n\nObject.defineProperties(ByteLengthQueuingStrategy.prototype, {\n  highWaterMark: { enumerable: true },\n  size: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ByteLengthQueuingStrategy.prototype, Symbol.toStringTag, {\n    value: 'ByteLengthQueuingStrategy',\n    configurable: true\n  });\n}\n\n// Helper functions for the ByteLengthQueuingStrategy.\n\nfunction byteLengthBrandCheckException(name: string): TypeError {\n  return new TypeError(`ByteLengthQueuingStrategy.prototype.${name} can only be used on a ByteLengthQueuingStrategy`);\n}\n\nexport function IsByteLengthQueuingStrategy(x: any): x is ByteLengthQueuingStrategy {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_byteLengthQueuingStrategyHighWaterMark')) {\n    return false;\n  }\n\n  return x instanceof ByteLengthQueuingStrategy;\n}\n","import { QueuingStrategy, QueuingStrategyInit } from './queuing-strategy';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategyInit } from './validators/queuing-strategy-init';\n\n// The size function must not have a prototype property nor be a constructor\nconst countSizeFunction = (): 1 => {\n  return 1;\n};\ntry {\n  Object.defineProperty(countSizeFunction, 'name', {\n    value: 'size',\n    configurable: true\n  });\n} catch {\n  // This property is non-configurable in older browsers, so ignore if this throws.\n  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility\n}\n\n/**\n * A queuing strategy that counts the number of chunks.\n *\n * @public\n */\nexport default class CountQueuingStrategy implements QueuingStrategy<any> {\n  /** @internal */\n  readonly _countQueuingStrategyHighWaterMark!: number;\n\n  constructor(options: QueuingStrategyInit) {\n    assertRequiredArgument(options, 1, 'CountQueuingStrategy');\n    options = convertQueuingStrategyInit(options, 'First parameter');\n    this._countQueuingStrategyHighWaterMark = options.highWaterMark;\n  }\n\n  /**\n   * Returns the high water mark provided to the constructor.\n   */\n  get highWaterMark(): number {\n    if (!IsCountQueuingStrategy(this)) {\n      throw countBrandCheckException('highWaterMark');\n    }\n    return this._countQueuingStrategyHighWaterMark;\n  }\n\n  /**\n   * Measures the size of `chunk` by always returning 1.\n   * This ensures that the total queue size is a count of the number of chunks in the queue.\n   */\n  get size(): (chunk: any) => 1 {\n    if (!IsCountQueuingStrategy(this)) {\n      throw countBrandCheckException('size');\n    }\n    return countSizeFunction;\n  }\n}\n\nObject.defineProperties(CountQueuingStrategy.prototype, {\n  highWaterMark: { enumerable: true },\n  size: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(CountQueuingStrategy.prototype, Symbol.toStringTag, {\n    value: 'CountQueuingStrategy',\n    configurable: true\n  });\n}\n\n// Helper functions for the CountQueuingStrategy.\n\nfunction countBrandCheckException(name: string): TypeError {\n  return new TypeError(`CountQueuingStrategy.prototype.${name} can only be used on a CountQueuingStrategy`);\n}\n\nexport function IsCountQueuingStrategy(x: any): x is CountQueuingStrategy {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_countQueuingStrategyHighWaterMark')) {\n    return false;\n  }\n\n  return x instanceof CountQueuingStrategy;\n}\n","import { assertDictionary, assertFunction } from './basic';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\nimport {\n  Transformer,\n  TransformerFlushCallback,\n  TransformerStartCallback,\n  TransformerTransformCallback,\n  ValidatedTransformer\n} from '../transform-stream/transformer';\nimport { TransformStreamDefaultController } from '../transform-stream';\n\nexport function convertTransformer<I, O>(original: Transformer<I, O> | null,\n                                         context: string): ValidatedTransformer<I, O> {\n  assertDictionary(original, context);\n  const flush = original?.flush;\n  const readableType = original?.readableType;\n  const start = original?.start;\n  const transform = original?.transform;\n  const writableType = original?.writableType;\n  return {\n    flush: flush === undefined ?\n      undefined :\n      convertTransformerFlushCallback(flush, original!, `${context} has member 'flush' that`),\n    readableType,\n    start: start === undefined ?\n      undefined :\n      convertTransformerStartCallback(start, original!, `${context} has member 'start' that`),\n    transform: transform === undefined ?\n      undefined :\n      convertTransformerTransformCallback(transform, original!, `${context} has member 'transform' that`),\n    writableType\n  };\n}\n\nfunction convertTransformerFlushCallback<I, O>(\n  fn: TransformerFlushCallback<O>,\n  original: Transformer<I, O>,\n  context: string\n): (controller: TransformStreamDefaultController<O>) => Promise<void> {\n  assertFunction(fn, context);\n  return (controller: TransformStreamDefaultController<O>) => promiseCall(fn, original, [controller]);\n}\n\nfunction convertTransformerStartCallback<I, O>(\n  fn: TransformerStartCallback<O>,\n  original: Transformer<I, O>,\n  context: string\n): TransformerStartCallback<O> {\n  assertFunction(fn, context);\n  return (controller: TransformStreamDefaultController<O>) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertTransformerTransformCallback<I, O>(\n  fn: TransformerTransformCallback<I, O>,\n  original: Transformer<I, O>,\n  context: string\n): (chunk: I, controller: TransformStreamDefaultController<O>) => Promise<void> {\n  assertFunction(fn, context);\n  return (chunk: I, controller: TransformStreamDefaultController<O>) => promiseCall(fn, original, [chunk, controller]);\n}\n","import assert from '../stub/assert';\nimport { newPromise, promiseRejectedWith, promiseResolvedWith, transformPromiseWith } from './helpers/webidl';\nimport { CreateReadableStream, ReadableStream, ReadableStreamDefaultController } from './readable-stream';\nimport {\n  ReadableStreamDefaultControllerCanCloseOrEnqueue,\n  ReadableStreamDefaultControllerClose,\n  ReadableStreamDefaultControllerEnqueue,\n  ReadableStreamDefaultControllerError,\n  ReadableStreamDefaultControllerGetDesiredSize,\n  ReadableStreamDefaultControllerHasBackpressure\n} from './readable-stream/default-controller';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { CreateWritableStream, WritableStream, WritableStreamDefaultControllerErrorIfNeeded } from './writable-stream';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport {\n  Transformer,\n  TransformerFlushCallback,\n  TransformerStartCallback,\n  TransformerTransformCallback,\n  ValidatedTransformer\n} from './transform-stream/transformer';\nimport { convertTransformer } from './validators/transformer';\n\n// Class TransformStream\n\n/**\n * A transform stream consists of a pair of streams: a {@link WritableStream | writable stream},\n * known as its writable side, and a {@link ReadableStream | readable stream}, known as its readable side.\n * In a manner specific to the transform stream in question, writes to the writable side result in new data being\n * made available for reading from the readable side.\n *\n * @public\n */\nexport class TransformStream<I = any, O = any> {\n  /** @internal */\n  _writable!: WritableStream<I>;\n  /** @internal */\n  _readable!: ReadableStream<O>;\n  /** @internal */\n  _backpressure!: boolean;\n  /** @internal */\n  _backpressureChangePromise!: Promise<void>;\n  /** @internal */\n  _backpressureChangePromise_resolve!: () => void;\n  /** @internal */\n  _transformStreamController!: TransformStreamDefaultController<O>;\n\n  constructor(\n    transformer?: Transformer<I, O>,\n    writableStrategy?: QueuingStrategy<I>,\n    readableStrategy?: QueuingStrategy<O>\n  );\n  constructor(rawTransformer: Transformer<I, O> | null | undefined = {},\n              rawWritableStrategy: QueuingStrategy<I> | null | undefined = {},\n              rawReadableStrategy: QueuingStrategy<O> | null | undefined = {}) {\n    if (rawTransformer === undefined) {\n      rawTransformer = null;\n    }\n\n    const writableStrategy = convertQueuingStrategy(rawWritableStrategy, 'Second parameter');\n    const readableStrategy = convertQueuingStrategy(rawReadableStrategy, 'Third parameter');\n\n    const transformer = convertTransformer(rawTransformer, 'First parameter');\n    if (transformer.readableType !== undefined) {\n      throw new RangeError('Invalid readableType specified');\n    }\n    if (transformer.writableType !== undefined) {\n      throw new RangeError('Invalid writableType specified');\n    }\n\n    const readableHighWaterMark = ExtractHighWaterMark(readableStrategy, 0);\n    const readableSizeAlgorithm = ExtractSizeAlgorithm(readableStrategy);\n    const writableHighWaterMark = ExtractHighWaterMark(writableStrategy, 1);\n    const writableSizeAlgorithm = ExtractSizeAlgorithm(writableStrategy);\n\n    let startPromise_resolve!: (value: void | PromiseLike<void>) => void;\n    const startPromise = newPromise<void>(resolve => {\n      startPromise_resolve = resolve;\n    });\n\n    InitializeTransformStream(\n      this, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm\n    );\n    SetUpTransformStreamDefaultControllerFromTransformer(this, transformer);\n\n    if (transformer.start !== undefined) {\n      startPromise_resolve(transformer.start(this._transformStreamController));\n    } else {\n      startPromise_resolve(undefined);\n    }\n  }\n\n  /**\n   * The readable side of the transform stream.\n   */\n  get readable(): ReadableStream<O> {\n    if (!IsTransformStream(this)) {\n      throw streamBrandCheckException('readable');\n    }\n\n    return this._readable;\n  }\n\n  /**\n   * The writable side of the transform stream.\n   */\n  get writable(): WritableStream<I> {\n    if (!IsTransformStream(this)) {\n      throw streamBrandCheckException('writable');\n    }\n\n    return this._writable;\n  }\n}\n\nObject.defineProperties(TransformStream.prototype, {\n  readable: { enumerable: true },\n  writable: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(TransformStream.prototype, Symbol.toStringTag, {\n    value: 'TransformStream',\n    configurable: true\n  });\n}\n\nexport {\n  Transformer,\n  TransformerStartCallback,\n  TransformerFlushCallback,\n  TransformerTransformCallback\n};\n\n// Transform Stream Abstract Operations\n\nexport function CreateTransformStream<I, O>(startAlgorithm: () => void | PromiseLike<void>,\n                                            transformAlgorithm: (chunk: I) => Promise<void>,\n                                            flushAlgorithm: () => Promise<void>,\n                                            writableHighWaterMark = 1,\n                                            writableSizeAlgorithm: QueuingStrategySizeCallback<I> = () => 1,\n                                            readableHighWaterMark = 0,\n                                            readableSizeAlgorithm: QueuingStrategySizeCallback<O> = () => 1) {\n  assert(IsNonNegativeNumber(writableHighWaterMark));\n  assert(IsNonNegativeNumber(readableHighWaterMark));\n\n  const stream: TransformStream<I, O> = Object.create(TransformStream.prototype);\n\n  let startPromise_resolve!: (value: void | PromiseLike<void>) => void;\n  const startPromise = newPromise<void>(resolve => {\n    startPromise_resolve = resolve;\n  });\n\n  InitializeTransformStream(stream, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark,\n                            readableSizeAlgorithm);\n\n  const controller: TransformStreamDefaultController<O> = Object.create(TransformStreamDefaultController.prototype);\n\n  SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);\n\n  const startResult = startAlgorithm();\n  startPromise_resolve(startResult);\n  return stream;\n}\n\nfunction InitializeTransformStream<I, O>(stream: TransformStream<I, O>,\n                                         startPromise: Promise<void>,\n                                         writableHighWaterMark: number,\n                                         writableSizeAlgorithm: QueuingStrategySizeCallback<I>,\n                                         readableHighWaterMark: number,\n                                         readableSizeAlgorithm: QueuingStrategySizeCallback<O>) {\n  function startAlgorithm(): Promise<void> {\n    return startPromise;\n  }\n\n  function writeAlgorithm(chunk: I): Promise<void> {\n    return TransformStreamDefaultSinkWriteAlgorithm(stream, chunk);\n  }\n\n  function abortAlgorithm(reason: any): Promise<void> {\n    return TransformStreamDefaultSinkAbortAlgorithm(stream, reason);\n  }\n\n  function closeAlgorithm(): Promise<void> {\n    return TransformStreamDefaultSinkCloseAlgorithm(stream);\n  }\n\n  stream._writable = CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm,\n                                          writableHighWaterMark, writableSizeAlgorithm);\n\n  function pullAlgorithm(): Promise<void> {\n    return TransformStreamDefaultSourcePullAlgorithm(stream);\n  }\n\n  function cancelAlgorithm(reason: any): Promise<void> {\n    TransformStreamErrorWritableAndUnblockWrite(stream, reason);\n    return promiseResolvedWith(undefined);\n  }\n\n  stream._readable = CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, readableHighWaterMark,\n                                          readableSizeAlgorithm);\n\n  // The [[backpressure]] slot is set to undefined so that it can be initialised by TransformStreamSetBackpressure.\n  stream._backpressure = undefined!;\n  stream._backpressureChangePromise = undefined!;\n  stream._backpressureChangePromise_resolve = undefined!;\n  TransformStreamSetBackpressure(stream, true);\n\n  stream._transformStreamController = undefined!;\n}\n\nfunction IsTransformStream(x: unknown): x is TransformStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_transformStreamController')) {\n    return false;\n  }\n\n  return x instanceof TransformStream;\n}\n\n// This is a no-op if both sides are already errored.\nfunction TransformStreamError(stream: TransformStream, e: any) {\n  ReadableStreamDefaultControllerError(\n    stream._readable._readableStreamController as ReadableStreamDefaultController<any>,\n    e\n  );\n  TransformStreamErrorWritableAndUnblockWrite(stream, e);\n}\n\nfunction TransformStreamErrorWritableAndUnblockWrite(stream: TransformStream, e: any) {\n  TransformStreamDefaultControllerClearAlgorithms(stream._transformStreamController);\n  WritableStreamDefaultControllerErrorIfNeeded(stream._writable._writableStreamController, e);\n  if (stream._backpressure) {\n    // Pretend that pull() was called to permit any pending write() calls to complete. TransformStreamSetBackpressure()\n    // cannot be called from enqueue() or pull() once the ReadableStream is errored, so this will will be the final time\n    // _backpressure is set.\n    TransformStreamSetBackpressure(stream, false);\n  }\n}\n\nfunction TransformStreamSetBackpressure(stream: TransformStream, backpressure: boolean) {\n  // Passes also when called during construction.\n  assert(stream._backpressure !== backpressure);\n\n  if (stream._backpressureChangePromise !== undefined) {\n    stream._backpressureChangePromise_resolve();\n  }\n\n  stream._backpressureChangePromise = newPromise(resolve => {\n    stream._backpressureChangePromise_resolve = resolve;\n  });\n\n  stream._backpressure = backpressure;\n}\n\n// Class TransformStreamDefaultController\n\n/**\n * Allows control of the {@link ReadableStream} and {@link WritableStream} of the associated {@link TransformStream}.\n *\n * @public\n */\nexport class TransformStreamDefaultController<O> {\n  /** @internal */\n  _controlledTransformStream: TransformStream<any, O>;\n  /** @internal */\n  _transformAlgorithm: (chunk: any) => Promise<void>;\n  /** @internal */\n  _flushAlgorithm: () => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the desired size to fill the readable side’s internal queue. It can be negative, if the queue is over-full.\n   */\n  get desiredSize(): number | null {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('desiredSize');\n    }\n\n    const readableController = this._controlledTransformStream._readable._readableStreamController;\n    return ReadableStreamDefaultControllerGetDesiredSize(readableController as ReadableStreamDefaultController<O>);\n  }\n\n  /**\n   * Enqueues the given chunk `chunk` in the readable side of the controlled transform stream.\n   */\n  enqueue(chunk: O): void;\n  enqueue(chunk: O = undefined!): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('enqueue');\n    }\n\n    TransformStreamDefaultControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors both the readable side and the writable side of the controlled transform stream, making all future\n   * interactions with it fail with the given error `e`. Any chunks queued for transformation will be discarded.\n   */\n  error(reason: any = undefined): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n\n    TransformStreamDefaultControllerError(this, reason);\n  }\n\n  /**\n   * Closes the readable side and errors the writable side of the controlled transform stream. This is useful when the\n   * transformer only needs to consume a portion of the chunks written to the writable side.\n   */\n  terminate(): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('terminate');\n    }\n\n    TransformStreamDefaultControllerTerminate(this);\n  }\n}\n\nObject.defineProperties(TransformStreamDefaultController.prototype, {\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  terminate: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(TransformStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'TransformStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Transform Stream Default Controller Abstract Operations\n\nfunction IsTransformStreamDefaultController<O = any>(x: any): x is TransformStreamDefaultController<O> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledTransformStream')) {\n    return false;\n  }\n\n  return x instanceof TransformStreamDefaultController;\n}\n\nfunction SetUpTransformStreamDefaultController<I, O>(stream: TransformStream<I, O>,\n                                                     controller: TransformStreamDefaultController<O>,\n                                                     transformAlgorithm: (chunk: I) => Promise<void>,\n                                                     flushAlgorithm: () => Promise<void>) {\n  assert(IsTransformStream(stream));\n  assert(stream._transformStreamController === undefined);\n\n  controller._controlledTransformStream = stream;\n  stream._transformStreamController = controller;\n\n  controller._transformAlgorithm = transformAlgorithm;\n  controller._flushAlgorithm = flushAlgorithm;\n}\n\nfunction SetUpTransformStreamDefaultControllerFromTransformer<I, O>(stream: TransformStream<I, O>,\n                                                                    transformer: ValidatedTransformer<I, O>) {\n  const controller: TransformStreamDefaultController<O> = Object.create(TransformStreamDefaultController.prototype);\n\n  let transformAlgorithm = (chunk: I): Promise<void> => {\n    try {\n      TransformStreamDefaultControllerEnqueue(controller, chunk as unknown as O);\n      return promiseResolvedWith(undefined);\n    } catch (transformResultE) {\n      return promiseRejectedWith(transformResultE);\n    }\n  };\n\n  let flushAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (transformer.transform !== undefined) {\n    transformAlgorithm = chunk => transformer.transform!(chunk, controller);\n  }\n  if (transformer.flush !== undefined) {\n    flushAlgorithm = () => transformer.flush!(controller);\n  }\n\n  SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);\n}\n\nfunction TransformStreamDefaultControllerClearAlgorithms(controller: TransformStreamDefaultController<any>) {\n  controller._transformAlgorithm = undefined!;\n  controller._flushAlgorithm = undefined!;\n}\n\nfunction TransformStreamDefaultControllerEnqueue<O>(controller: TransformStreamDefaultController<O>, chunk: O) {\n  const stream = controller._controlledTransformStream;\n  const readableController = stream._readable._readableStreamController as ReadableStreamDefaultController<O>;\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(readableController)) {\n    throw new TypeError('Readable side is not in a state that permits enqueue');\n  }\n\n  // We throttle transform invocations based on the backpressure of the ReadableStream, but we still\n  // accept TransformStreamDefaultControllerEnqueue() calls.\n\n  try {\n    ReadableStreamDefaultControllerEnqueue(readableController, chunk);\n  } catch (e) {\n    // This happens when readableStrategy.size() throws.\n    TransformStreamErrorWritableAndUnblockWrite(stream, e);\n\n    throw stream._readable._storedError;\n  }\n\n  const backpressure = ReadableStreamDefaultControllerHasBackpressure(readableController);\n  if (backpressure !== stream._backpressure) {\n    assert(backpressure);\n    TransformStreamSetBackpressure(stream, true);\n  }\n}\n\nfunction TransformStreamDefaultControllerError(controller: TransformStreamDefaultController<any>, e: any) {\n  TransformStreamError(controller._controlledTransformStream, e);\n}\n\nfunction TransformStreamDefaultControllerPerformTransform<I, O>(controller: TransformStreamDefaultController<O>,\n                                                                chunk: I) {\n  const transformPromise = controller._transformAlgorithm(chunk);\n  return transformPromiseWith(transformPromise, undefined, r => {\n    TransformStreamError(controller._controlledTransformStream, r);\n    throw r;\n  });\n}\n\nfunction TransformStreamDefaultControllerTerminate<O>(controller: TransformStreamDefaultController<O>) {\n  const stream = controller._controlledTransformStream;\n  const readableController = stream._readable._readableStreamController as ReadableStreamDefaultController<O>;\n\n  ReadableStreamDefaultControllerClose(readableController);\n\n  const error = new TypeError('TransformStream terminated');\n  TransformStreamErrorWritableAndUnblockWrite(stream, error);\n}\n\n// TransformStreamDefaultSink Algorithms\n\nfunction TransformStreamDefaultSinkWriteAlgorithm<I, O>(stream: TransformStream<I, O>, chunk: I): Promise<void> {\n  assert(stream._writable._state === 'writable');\n\n  const controller = stream._transformStreamController;\n\n  if (stream._backpressure) {\n    const backpressureChangePromise = stream._backpressureChangePromise;\n    assert(backpressureChangePromise !== undefined);\n    return transformPromiseWith(backpressureChangePromise, () => {\n      const writable = stream._writable;\n      const state = writable._state;\n      if (state === 'erroring') {\n        throw writable._storedError;\n      }\n      assert(state === 'writable');\n      return TransformStreamDefaultControllerPerformTransform<I, O>(controller, chunk);\n    });\n  }\n\n  return TransformStreamDefaultControllerPerformTransform<I, O>(controller, chunk);\n}\n\nfunction TransformStreamDefaultSinkAbortAlgorithm(stream: TransformStream, reason: any): Promise<void> {\n  // abort() is not called synchronously, so it is possible for abort() to be called when the stream is already\n  // errored.\n  TransformStreamError(stream, reason);\n  return promiseResolvedWith(undefined);\n}\n\nfunction TransformStreamDefaultSinkCloseAlgorithm<I, O>(stream: TransformStream<I, O>): Promise<void> {\n  // stream._readable cannot change after construction, so caching it across a call to user code is safe.\n  const readable = stream._readable;\n\n  const controller = stream._transformStreamController;\n  const flushPromise = controller._flushAlgorithm();\n  TransformStreamDefaultControllerClearAlgorithms(controller);\n\n  // Return a promise that is fulfilled with undefined on success.\n  return transformPromiseWith(flushPromise, () => {\n    if (readable._state === 'errored') {\n      throw readable._storedError;\n    }\n    ReadableStreamDefaultControllerClose(readable._readableStreamController as ReadableStreamDefaultController<O>);\n  }, r => {\n    TransformStreamError(stream, r);\n    throw readable._storedError;\n  });\n}\n\n// TransformStreamDefaultSource Algorithms\n\nfunction TransformStreamDefaultSourcePullAlgorithm(stream: TransformStream): Promise<void> {\n  // Invariant. Enforced by the promises returned by start() and pull().\n  assert(stream._backpressure);\n\n  assert(stream._backpressureChangePromise !== undefined);\n\n  TransformStreamSetBackpressure(stream, false);\n\n  // Prevent the next pull() call until there is backpressure.\n  return stream._backpressureChangePromise;\n}\n\n// Helper functions for the TransformStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `TransformStreamDefaultController.prototype.${name} can only be used on a TransformStreamDefaultController`);\n}\n\n// Helper functions for the TransformStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `TransformStream.prototype.${name} can only be used on a TransformStream`);\n}\n","import {\n  ByteLengthQueuingStrategy,\n  CountQueuingStrategy,\n  ReadableByteStreamController,\n  ReadableStream,\n  ReadableStreamBYOBReader,\n  ReadableStreamBYOBRequest,\n  ReadableStreamDefaultController,\n  ReadableStreamDefaultReader,\n  TransformStream,\n  TransformStreamDefaultController,\n  WritableStream,\n  WritableStreamDefaultController,\n  WritableStreamDefaultWriter\n} from './ponyfill';\nimport { globals } from './utils';\n\n// Export\nexport * from './ponyfill';\n\nconst exports = {\n  ReadableStream,\n  ReadableStreamDefaultController,\n  ReadableByteStreamController,\n  ReadableStreamBYOBRequest,\n  ReadableStreamDefaultReader,\n  ReadableStreamBYOBReader,\n\n  WritableStream,\n  WritableStreamDefaultController,\n  WritableStreamDefaultWriter,\n\n  ByteLengthQueuingStrategy,\n  CountQueuingStrategy,\n\n  TransformStream,\n  TransformStreamDefaultController\n};\n\n// Add classes to global scope\nif (typeof globals !== 'undefined') {\n  for (const prop in exports) {\n    if (Object.prototype.hasOwnProperty.call(exports, prop)) {\n      Object.defineProperty(globals, prop, {\n        value: exports[prop as (keyof typeof exports)],\n        writable: true,\n        configurable: true\n      });\n    }\n  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\ No newline at end of file
diff --git a/node_modules/web-streams-polyfill/dist/polyfill.mjs b/node_modules/web-streams-polyfill/dist/polyfill.mjs
new file mode 100644
index 0000000..e033af5
--- /dev/null
+++ b/node_modules/web-streams-polyfill/dist/polyfill.mjs
@@ -0,0 +1,4360 @@
+/**
+ * web-streams-polyfill v3.2.1
+ */
+/// <reference lib="es2015.symbol" />
+var SymbolPolyfill = typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol' ?
+    Symbol :
+    function (description) { return "Symbol(" + description + ")"; };
+
+/// <reference lib="dom" />
+function noop() {
+    return undefined;
+}
+function getGlobals() {
+    if (typeof self !== 'undefined') {
+        return self;
+    }
+    else if (typeof window !== 'undefined') {
+        return window;
+    }
+    else if (typeof global !== 'undefined') {
+        return global;
+    }
+    return undefined;
+}
+var globals = getGlobals();
+
+function typeIsObject(x) {
+    return (typeof x === 'object' && x !== null) || typeof x === 'function';
+}
+var rethrowAssertionErrorRejection = noop;
+
+var originalPromise = Promise;
+var originalPromiseThen = Promise.prototype.then;
+var originalPromiseResolve = Promise.resolve.bind(originalPromise);
+var originalPromiseReject = Promise.reject.bind(originalPromise);
+function newPromise(executor) {
+    return new originalPromise(executor);
+}
+function promiseResolvedWith(value) {
+    return originalPromiseResolve(value);
+}
+function promiseRejectedWith(reason) {
+    return originalPromiseReject(reason);
+}
+function PerformPromiseThen(promise, onFulfilled, onRejected) {
+    // There doesn't appear to be any way to correctly emulate the behaviour from JavaScript, so this is just an
+    // approximation.
+    return originalPromiseThen.call(promise, onFulfilled, onRejected);
+}
+function uponPromise(promise, onFulfilled, onRejected) {
+    PerformPromiseThen(PerformPromiseThen(promise, onFulfilled, onRejected), undefined, rethrowAssertionErrorRejection);
+}
+function uponFulfillment(promise, onFulfilled) {
+    uponPromise(promise, onFulfilled);
+}
+function uponRejection(promise, onRejected) {
+    uponPromise(promise, undefined, onRejected);
+}
+function transformPromiseWith(promise, fulfillmentHandler, rejectionHandler) {
+    return PerformPromiseThen(promise, fulfillmentHandler, rejectionHandler);
+}
+function setPromiseIsHandledToTrue(promise) {
+    PerformPromiseThen(promise, undefined, rethrowAssertionErrorRejection);
+}
+var queueMicrotask = (function () {
+    var globalQueueMicrotask = globals && globals.queueMicrotask;
+    if (typeof globalQueueMicrotask === 'function') {
+        return globalQueueMicrotask;
+    }
+    var resolvedPromise = promiseResolvedWith(undefined);
+    return function (fn) { return PerformPromiseThen(resolvedPromise, fn); };
+})();
+function reflectCall(F, V, args) {
+    if (typeof F !== 'function') {
+        throw new TypeError('Argument is not a function');
+    }
+    return Function.prototype.apply.call(F, V, args);
+}
+function promiseCall(F, V, args) {
+    try {
+        return promiseResolvedWith(reflectCall(F, V, args));
+    }
+    catch (value) {
+        return promiseRejectedWith(value);
+    }
+}
+
+// Original from Chromium
+// https://chromium.googlesource.com/chromium/src/+/0aee4434a4dba42a42abaea9bfbc0cd196a63bc1/third_party/blink/renderer/core/streams/SimpleQueue.js
+var QUEUE_MAX_ARRAY_SIZE = 16384;
+/**
+ * Simple queue structure.
+ *
+ * Avoids scalability issues with using a packed array directly by using
+ * multiple arrays in a linked list and keeping the array size bounded.
+ */
+var SimpleQueue = /** @class */ (function () {
+    function SimpleQueue() {
+        this._cursor = 0;
+        this._size = 0;
+        // _front and _back are always defined.
+        this._front = {
+            _elements: [],
+            _next: undefined
+        };
+        this._back = this._front;
+        // The cursor is used to avoid calling Array.shift().
+        // It contains the index of the front element of the array inside the
+        // front-most node. It is always in the range [0, QUEUE_MAX_ARRAY_SIZE).
+        this._cursor = 0;
+        // When there is only one node, size === elements.length - cursor.
+        this._size = 0;
+    }
+    Object.defineProperty(SimpleQueue.prototype, "length", {
+        get: function () {
+            return this._size;
+        },
+        enumerable: false,
+        configurable: true
+    });
+    // For exception safety, this method is structured in order:
+    // 1. Read state
+    // 2. Calculate required state mutations
+    // 3. Perform state mutations
+    SimpleQueue.prototype.push = function (element) {
+        var oldBack = this._back;
+        var newBack = oldBack;
+        if (oldBack._elements.length === QUEUE_MAX_ARRAY_SIZE - 1) {
+            newBack = {
+                _elements: [],
+                _next: undefined
+            };
+        }
+        // push() is the mutation most likely to throw an exception, so it
+        // goes first.
+        oldBack._elements.push(element);
+        if (newBack !== oldBack) {
+            this._back = newBack;
+            oldBack._next = newBack;
+        }
+        ++this._size;
+    };
+    // Like push(), shift() follows the read -> calculate -> mutate pattern for
+    // exception safety.
+    SimpleQueue.prototype.shift = function () { // must not be called on an empty queue
+        var oldFront = this._front;
+        var newFront = oldFront;
+        var oldCursor = this._cursor;
+        var newCursor = oldCursor + 1;
+        var elements = oldFront._elements;
+        var element = elements[oldCursor];
+        if (newCursor === QUEUE_MAX_ARRAY_SIZE) {
+            newFront = oldFront._next;
+            newCursor = 0;
+        }
+        // No mutations before this point.
+        --this._size;
+        this._cursor = newCursor;
+        if (oldFront !== newFront) {
+            this._front = newFront;
+        }
+        // Permit shifted element to be garbage collected.
+        elements[oldCursor] = undefined;
+        return element;
+    };
+    // The tricky thing about forEach() is that it can be called
+    // re-entrantly. The queue may be mutated inside the callback. It is easy to
+    // see that push() within the callback has no negative effects since the end
+    // of the queue is checked for on every iteration. If shift() is called
+    // repeatedly within the callback then the next iteration may return an
+    // element that has been removed. In this case the callback will be called
+    // with undefined values until we either "catch up" with elements that still
+    // exist or reach the back of the queue.
+    SimpleQueue.prototype.forEach = function (callback) {
+        var i = this._cursor;
+        var node = this._front;
+        var elements = node._elements;
+        while (i !== elements.length || node._next !== undefined) {
+            if (i === elements.length) {
+                node = node._next;
+                elements = node._elements;
+                i = 0;
+                if (elements.length === 0) {
+                    break;
+                }
+            }
+            callback(elements[i]);
+            ++i;
+        }
+    };
+    // Return the element that would be returned if shift() was called now,
+    // without modifying the queue.
+    SimpleQueue.prototype.peek = function () { // must not be called on an empty queue
+        var front = this._front;
+        var cursor = this._cursor;
+        return front._elements[cursor];
+    };
+    return SimpleQueue;
+}());
+
+function ReadableStreamReaderGenericInitialize(reader, stream) {
+    reader._ownerReadableStream = stream;
+    stream._reader = reader;
+    if (stream._state === 'readable') {
+        defaultReaderClosedPromiseInitialize(reader);
+    }
+    else if (stream._state === 'closed') {
+        defaultReaderClosedPromiseInitializeAsResolved(reader);
+    }
+    else {
+        defaultReaderClosedPromiseInitializeAsRejected(reader, stream._storedError);
+    }
+}
+// A client of ReadableStreamDefaultReader and ReadableStreamBYOBReader may use these functions directly to bypass state
+// check.
+function ReadableStreamReaderGenericCancel(reader, reason) {
+    var stream = reader._ownerReadableStream;
+    return ReadableStreamCancel(stream, reason);
+}
+function ReadableStreamReaderGenericRelease(reader) {
+    if (reader._ownerReadableStream._state === 'readable') {
+        defaultReaderClosedPromiseReject(reader, new TypeError("Reader was released and can no longer be used to monitor the stream's closedness"));
+    }
+    else {
+        defaultReaderClosedPromiseResetToRejected(reader, new TypeError("Reader was released and can no longer be used to monitor the stream's closedness"));
+    }
+    reader._ownerReadableStream._reader = undefined;
+    reader._ownerReadableStream = undefined;
+}
+// Helper functions for the readers.
+function readerLockException(name) {
+    return new TypeError('Cannot ' + name + ' a stream using a released reader');
+}
+// Helper functions for the ReadableStreamDefaultReader.
+function defaultReaderClosedPromiseInitialize(reader) {
+    reader._closedPromise = newPromise(function (resolve, reject) {
+        reader._closedPromise_resolve = resolve;
+        reader._closedPromise_reject = reject;
+    });
+}
+function defaultReaderClosedPromiseInitializeAsRejected(reader, reason) {
+    defaultReaderClosedPromiseInitialize(reader);
+    defaultReaderClosedPromiseReject(reader, reason);
+}
+function defaultReaderClosedPromiseInitializeAsResolved(reader) {
+    defaultReaderClosedPromiseInitialize(reader);
+    defaultReaderClosedPromiseResolve(reader);
+}
+function defaultReaderClosedPromiseReject(reader, reason) {
+    if (reader._closedPromise_reject === undefined) {
+        return;
+    }
+    setPromiseIsHandledToTrue(reader._closedPromise);
+    reader._closedPromise_reject(reason);
+    reader._closedPromise_resolve = undefined;
+    reader._closedPromise_reject = undefined;
+}
+function defaultReaderClosedPromiseResetToRejected(reader, reason) {
+    defaultReaderClosedPromiseInitializeAsRejected(reader, reason);
+}
+function defaultReaderClosedPromiseResolve(reader) {
+    if (reader._closedPromise_resolve === undefined) {
+        return;
+    }
+    reader._closedPromise_resolve(undefined);
+    reader._closedPromise_resolve = undefined;
+    reader._closedPromise_reject = undefined;
+}
+
+var AbortSteps = SymbolPolyfill('[[AbortSteps]]');
+var ErrorSteps = SymbolPolyfill('[[ErrorSteps]]');
+var CancelSteps = SymbolPolyfill('[[CancelSteps]]');
+var PullSteps = SymbolPolyfill('[[PullSteps]]');
+
+/// <reference lib="es2015.core" />
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite#Polyfill
+var NumberIsFinite = Number.isFinite || function (x) {
+    return typeof x === 'number' && isFinite(x);
+};
+
+/// <reference lib="es2015.core" />
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc#Polyfill
+var MathTrunc = Math.trunc || function (v) {
+    return v < 0 ? Math.ceil(v) : Math.floor(v);
+};
+
+// https://heycam.github.io/webidl/#idl-dictionaries
+function isDictionary(x) {
+    return typeof x === 'object' || typeof x === 'function';
+}
+function assertDictionary(obj, context) {
+    if (obj !== undefined && !isDictionary(obj)) {
+        throw new TypeError(context + " is not an object.");
+    }
+}
+// https://heycam.github.io/webidl/#idl-callback-functions
+function assertFunction(x, context) {
+    if (typeof x !== 'function') {
+        throw new TypeError(context + " is not a function.");
+    }
+}
+// https://heycam.github.io/webidl/#idl-object
+function isObject(x) {
+    return (typeof x === 'object' && x !== null) || typeof x === 'function';
+}
+function assertObject(x, context) {
+    if (!isObject(x)) {
+        throw new TypeError(context + " is not an object.");
+    }
+}
+function assertRequiredArgument(x, position, context) {
+    if (x === undefined) {
+        throw new TypeError("Parameter " + position + " is required in '" + context + "'.");
+    }
+}
+function assertRequiredField(x, field, context) {
+    if (x === undefined) {
+        throw new TypeError(field + " is required in '" + context + "'.");
+    }
+}
+// https://heycam.github.io/webidl/#idl-unrestricted-double
+function convertUnrestrictedDouble(value) {
+    return Number(value);
+}
+function censorNegativeZero(x) {
+    return x === 0 ? 0 : x;
+}
+function integerPart(x) {
+    return censorNegativeZero(MathTrunc(x));
+}
+// https://heycam.github.io/webidl/#idl-unsigned-long-long
+function convertUnsignedLongLongWithEnforceRange(value, context) {
+    var lowerBound = 0;
+    var upperBound = Number.MAX_SAFE_INTEGER;
+    var x = Number(value);
+    x = censorNegativeZero(x);
+    if (!NumberIsFinite(x)) {
+        throw new TypeError(context + " is not a finite number");
+    }
+    x = integerPart(x);
+    if (x < lowerBound || x > upperBound) {
+        throw new TypeError(context + " is outside the accepted range of " + lowerBound + " to " + upperBound + ", inclusive");
+    }
+    if (!NumberIsFinite(x) || x === 0) {
+        return 0;
+    }
+    // TODO Use BigInt if supported?
+    // let xBigInt = BigInt(integerPart(x));
+    // xBigInt = BigInt.asUintN(64, xBigInt);
+    // return Number(xBigInt);
+    return x;
+}
+
+function assertReadableStream(x, context) {
+    if (!IsReadableStream(x)) {
+        throw new TypeError(context + " is not a ReadableStream.");
+    }
+}
+
+// Abstract operations for the ReadableStream.
+function AcquireReadableStreamDefaultReader(stream) {
+    return new ReadableStreamDefaultReader(stream);
+}
+// ReadableStream API exposed for controllers.
+function ReadableStreamAddReadRequest(stream, readRequest) {
+    stream._reader._readRequests.push(readRequest);
+}
+function ReadableStreamFulfillReadRequest(stream, chunk, done) {
+    var reader = stream._reader;
+    var readRequest = reader._readRequests.shift();
+    if (done) {
+        readRequest._closeSteps();
+    }
+    else {
+        readRequest._chunkSteps(chunk);
+    }
+}
+function ReadableStreamGetNumReadRequests(stream) {
+    return stream._reader._readRequests.length;
+}
+function ReadableStreamHasDefaultReader(stream) {
+    var reader = stream._reader;
+    if (reader === undefined) {
+        return false;
+    }
+    if (!IsReadableStreamDefaultReader(reader)) {
+        return false;
+    }
+    return true;
+}
+/**
+ * A default reader vended by a {@link ReadableStream}.
+ *
+ * @public
+ */
+var ReadableStreamDefaultReader = /** @class */ (function () {
+    function ReadableStreamDefaultReader(stream) {
+        assertRequiredArgument(stream, 1, 'ReadableStreamDefaultReader');
+        assertReadableStream(stream, 'First parameter');
+        if (IsReadableStreamLocked(stream)) {
+            throw new TypeError('This stream has already been locked for exclusive reading by another reader');
+        }
+        ReadableStreamReaderGenericInitialize(this, stream);
+        this._readRequests = new SimpleQueue();
+    }
+    Object.defineProperty(ReadableStreamDefaultReader.prototype, "closed", {
+        /**
+         * Returns a promise that will be fulfilled when the stream becomes closed,
+         * or rejected if the stream ever errors or the reader's lock is released before the stream finishes closing.
+         */
+        get: function () {
+            if (!IsReadableStreamDefaultReader(this)) {
+                return promiseRejectedWith(defaultReaderBrandCheckException('closed'));
+            }
+            return this._closedPromise;
+        },
+        enumerable: false,
+        configurable: true
+    });
+    /**
+     * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.
+     */
+    ReadableStreamDefaultReader.prototype.cancel = function (reason) {
+        if (reason === void 0) { reason = undefined; }
+        if (!IsReadableStreamDefaultReader(this)) {
+            return promiseRejectedWith(defaultReaderBrandCheckException('cancel'));
+        }
+        if (this._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('cancel'));
+        }
+        return ReadableStreamReaderGenericCancel(this, reason);
+    };
+    /**
+     * Returns a promise that allows access to the next chunk from the stream's internal queue, if available.
+     *
+     * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.
+     */
+    ReadableStreamDefaultReader.prototype.read = function () {
+        if (!IsReadableStreamDefaultReader(this)) {
+            return promiseRejectedWith(defaultReaderBrandCheckException('read'));
+        }
+        if (this._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('read from'));
+        }
+        var resolvePromise;
+        var rejectPromise;
+        var promise = newPromise(function (resolve, reject) {
+            resolvePromise = resolve;
+            rejectPromise = reject;
+        });
+        var readRequest = {
+            _chunkSteps: function (chunk) { return resolvePromise({ value: chunk, done: false }); },
+            _closeSteps: function () { return resolvePromise({ value: undefined, done: true }); },
+            _errorSteps: function (e) { return rejectPromise(e); }
+        };
+        ReadableStreamDefaultReaderRead(this, readRequest);
+        return promise;
+    };
+    /**
+     * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.
+     * If the associated stream is errored when the lock is released, the reader will appear errored in the same way
+     * from now on; otherwise, the reader will appear closed.
+     *
+     * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by
+     * the reader's {@link ReadableStreamDefaultReader.read | read()} method has not yet been settled. Attempting to
+     * do so will throw a `TypeError` and leave the reader locked to the stream.
+     */
+    ReadableStreamDefaultReader.prototype.releaseLock = function () {
+        if (!IsReadableStreamDefaultReader(this)) {
+            throw defaultReaderBrandCheckException('releaseLock');
+        }
+        if (this._ownerReadableStream === undefined) {
+            return;
+        }
+        if (this._readRequests.length > 0) {
+            throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');
+        }
+        ReadableStreamReaderGenericRelease(this);
+    };
+    return ReadableStreamDefaultReader;
+}());
+Object.defineProperties(ReadableStreamDefaultReader.prototype, {
+    cancel: { enumerable: true },
+    read: { enumerable: true },
+    releaseLock: { enumerable: true },
+    closed: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableStreamDefaultReader.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableStreamDefaultReader',
+        configurable: true
+    });
+}
+// Abstract operations for the readers.
+function IsReadableStreamDefaultReader(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_readRequests')) {
+        return false;
+    }
+    return x instanceof ReadableStreamDefaultReader;
+}
+function ReadableStreamDefaultReaderRead(reader, readRequest) {
+    var stream = reader._ownerReadableStream;
+    stream._disturbed = true;
+    if (stream._state === 'closed') {
+        readRequest._closeSteps();
+    }
+    else if (stream._state === 'errored') {
+        readRequest._errorSteps(stream._storedError);
+    }
+    else {
+        stream._readableStreamController[PullSteps](readRequest);
+    }
+}
+// Helper functions for the ReadableStreamDefaultReader.
+function defaultReaderBrandCheckException(name) {
+    return new TypeError("ReadableStreamDefaultReader.prototype." + name + " can only be used on a ReadableStreamDefaultReader");
+}
+
+/// <reference lib="es2018.asynciterable" />
+var _a;
+var AsyncIteratorPrototype;
+if (typeof SymbolPolyfill.asyncIterator === 'symbol') {
+    // We're running inside a ES2018+ environment, but we're compiling to an older syntax.
+    // We cannot access %AsyncIteratorPrototype% without non-ES2018 syntax, but we can re-create it.
+    AsyncIteratorPrototype = (_a = {},
+        // 25.1.3.1 %AsyncIteratorPrototype% [ @@asyncIterator ] ( )
+        // https://tc39.github.io/ecma262/#sec-asynciteratorprototype-asynciterator
+        _a[SymbolPolyfill.asyncIterator] = function () {
+            return this;
+        },
+        _a);
+    Object.defineProperty(AsyncIteratorPrototype, SymbolPolyfill.asyncIterator, { enumerable: false });
+}
+
+/// <reference lib="es2018.asynciterable" />
+var ReadableStreamAsyncIteratorImpl = /** @class */ (function () {
+    function ReadableStreamAsyncIteratorImpl(reader, preventCancel) {
+        this._ongoingPromise = undefined;
+        this._isFinished = false;
+        this._reader = reader;
+        this._preventCancel = preventCancel;
+    }
+    ReadableStreamAsyncIteratorImpl.prototype.next = function () {
+        var _this = this;
+        var nextSteps = function () { return _this._nextSteps(); };
+        this._ongoingPromise = this._ongoingPromise ?
+            transformPromiseWith(this._ongoingPromise, nextSteps, nextSteps) :
+            nextSteps();
+        return this._ongoingPromise;
+    };
+    ReadableStreamAsyncIteratorImpl.prototype.return = function (value) {
+        var _this = this;
+        var returnSteps = function () { return _this._returnSteps(value); };
+        return this._ongoingPromise ?
+            transformPromiseWith(this._ongoingPromise, returnSteps, returnSteps) :
+            returnSteps();
+    };
+    ReadableStreamAsyncIteratorImpl.prototype._nextSteps = function () {
+        var _this = this;
+        if (this._isFinished) {
+            return Promise.resolve({ value: undefined, done: true });
+        }
+        var reader = this._reader;
+        if (reader._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('iterate'));
+        }
+        var resolvePromise;
+        var rejectPromise;
+        var promise = newPromise(function (resolve, reject) {
+            resolvePromise = resolve;
+            rejectPromise = reject;
+        });
+        var readRequest = {
+            _chunkSteps: function (chunk) {
+                _this._ongoingPromise = undefined;
+                // This needs to be delayed by one microtask, otherwise we stop pulling too early which breaks a test.
+                // FIXME Is this a bug in the specification, or in the test?
+                queueMicrotask(function () { return resolvePromise({ value: chunk, done: false }); });
+            },
+            _closeSteps: function () {
+                _this._ongoingPromise = undefined;
+                _this._isFinished = true;
+                ReadableStreamReaderGenericRelease(reader);
+                resolvePromise({ value: undefined, done: true });
+            },
+            _errorSteps: function (reason) {
+                _this._ongoingPromise = undefined;
+                _this._isFinished = true;
+                ReadableStreamReaderGenericRelease(reader);
+                rejectPromise(reason);
+            }
+        };
+        ReadableStreamDefaultReaderRead(reader, readRequest);
+        return promise;
+    };
+    ReadableStreamAsyncIteratorImpl.prototype._returnSteps = function (value) {
+        if (this._isFinished) {
+            return Promise.resolve({ value: value, done: true });
+        }
+        this._isFinished = true;
+        var reader = this._reader;
+        if (reader._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('finish iterating'));
+        }
+        if (!this._preventCancel) {
+            var result = ReadableStreamReaderGenericCancel(reader, value);
+            ReadableStreamReaderGenericRelease(reader);
+            return transformPromiseWith(result, function () { return ({ value: value, done: true }); });
+        }
+        ReadableStreamReaderGenericRelease(reader);
+        return promiseResolvedWith({ value: value, done: true });
+    };
+    return ReadableStreamAsyncIteratorImpl;
+}());
+var ReadableStreamAsyncIteratorPrototype = {
+    next: function () {
+        if (!IsReadableStreamAsyncIterator(this)) {
+            return promiseRejectedWith(streamAsyncIteratorBrandCheckException('next'));
+        }
+        return this._asyncIteratorImpl.next();
+    },
+    return: function (value) {
+        if (!IsReadableStreamAsyncIterator(this)) {
+            return promiseRejectedWith(streamAsyncIteratorBrandCheckException('return'));
+        }
+        return this._asyncIteratorImpl.return(value);
+    }
+};
+if (AsyncIteratorPrototype !== undefined) {
+    Object.setPrototypeOf(ReadableStreamAsyncIteratorPrototype, AsyncIteratorPrototype);
+}
+// Abstract operations for the ReadableStream.
+function AcquireReadableStreamAsyncIterator(stream, preventCancel) {
+    var reader = AcquireReadableStreamDefaultReader(stream);
+    var impl = new ReadableStreamAsyncIteratorImpl(reader, preventCancel);
+    var iterator = Object.create(ReadableStreamAsyncIteratorPrototype);
+    iterator._asyncIteratorImpl = impl;
+    return iterator;
+}
+function IsReadableStreamAsyncIterator(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_asyncIteratorImpl')) {
+        return false;
+    }
+    try {
+        // noinspection SuspiciousTypeOfGuard
+        return x._asyncIteratorImpl instanceof
+            ReadableStreamAsyncIteratorImpl;
+    }
+    catch (_a) {
+        return false;
+    }
+}
+// Helper functions for the ReadableStream.
+function streamAsyncIteratorBrandCheckException(name) {
+    return new TypeError("ReadableStreamAsyncIterator." + name + " can only be used on a ReadableSteamAsyncIterator");
+}
+
+/// <reference lib="es2015.core" />
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Polyfill
+var NumberIsNaN = Number.isNaN || function (x) {
+    // eslint-disable-next-line no-self-compare
+    return x !== x;
+};
+
+function CreateArrayFromList(elements) {
+    // We use arrays to represent lists, so this is basically a no-op.
+    // Do a slice though just in case we happen to depend on the unique-ness.
+    return elements.slice();
+}
+function CopyDataBlockBytes(dest, destOffset, src, srcOffset, n) {
+    new Uint8Array(dest).set(new Uint8Array(src, srcOffset, n), destOffset);
+}
+// Not implemented correctly
+function TransferArrayBuffer(O) {
+    return O;
+}
+// Not implemented correctly
+// eslint-disable-next-line @typescript-eslint/no-unused-vars
+function IsDetachedBuffer(O) {
+    return false;
+}
+function ArrayBufferSlice(buffer, begin, end) {
+    // ArrayBuffer.prototype.slice is not available on IE10
+    // https://www.caniuse.com/mdn-javascript_builtins_arraybuffer_slice
+    if (buffer.slice) {
+        return buffer.slice(begin, end);
+    }
+    var length = end - begin;
+    var slice = new ArrayBuffer(length);
+    CopyDataBlockBytes(slice, 0, buffer, begin, length);
+    return slice;
+}
+
+function IsNonNegativeNumber(v) {
+    if (typeof v !== 'number') {
+        return false;
+    }
+    if (NumberIsNaN(v)) {
+        return false;
+    }
+    if (v < 0) {
+        return false;
+    }
+    return true;
+}
+function CloneAsUint8Array(O) {
+    var buffer = ArrayBufferSlice(O.buffer, O.byteOffset, O.byteOffset + O.byteLength);
+    return new Uint8Array(buffer);
+}
+
+function DequeueValue(container) {
+    var pair = container._queue.shift();
+    container._queueTotalSize -= pair.size;
+    if (container._queueTotalSize < 0) {
+        container._queueTotalSize = 0;
+    }
+    return pair.value;
+}
+function EnqueueValueWithSize(container, value, size) {
+    if (!IsNonNegativeNumber(size) || size === Infinity) {
+        throw new RangeError('Size must be a finite, non-NaN, non-negative number.');
+    }
+    container._queue.push({ value: value, size: size });
+    container._queueTotalSize += size;
+}
+function PeekQueueValue(container) {
+    var pair = container._queue.peek();
+    return pair.value;
+}
+function ResetQueue(container) {
+    container._queue = new SimpleQueue();
+    container._queueTotalSize = 0;
+}
+
+/**
+ * A pull-into request in a {@link ReadableByteStreamController}.
+ *
+ * @public
+ */
+var ReadableStreamBYOBRequest = /** @class */ (function () {
+    function ReadableStreamBYOBRequest() {
+        throw new TypeError('Illegal constructor');
+    }
+    Object.defineProperty(ReadableStreamBYOBRequest.prototype, "view", {
+        /**
+         * Returns the view for writing in to, or `null` if the BYOB request has already been responded to.
+         */
+        get: function () {
+            if (!IsReadableStreamBYOBRequest(this)) {
+                throw byobRequestBrandCheckException('view');
+            }
+            return this._view;
+        },
+        enumerable: false,
+        configurable: true
+    });
+    ReadableStreamBYOBRequest.prototype.respond = function (bytesWritten) {
+        if (!IsReadableStreamBYOBRequest(this)) {
+            throw byobRequestBrandCheckException('respond');
+        }
+        assertRequiredArgument(bytesWritten, 1, 'respond');
+        bytesWritten = convertUnsignedLongLongWithEnforceRange(bytesWritten, 'First parameter');
+        if (this._associatedReadableByteStreamController === undefined) {
+            throw new TypeError('This BYOB request has been invalidated');
+        }
+        if (IsDetachedBuffer(this._view.buffer)) ;
+        ReadableByteStreamControllerRespond(this._associatedReadableByteStreamController, bytesWritten);
+    };
+    ReadableStreamBYOBRequest.prototype.respondWithNewView = function (view) {
+        if (!IsReadableStreamBYOBRequest(this)) {
+            throw byobRequestBrandCheckException('respondWithNewView');
+        }
+        assertRequiredArgument(view, 1, 'respondWithNewView');
+        if (!ArrayBuffer.isView(view)) {
+            throw new TypeError('You can only respond with array buffer views');
+        }
+        if (this._associatedReadableByteStreamController === undefined) {
+            throw new TypeError('This BYOB request has been invalidated');
+        }
+        if (IsDetachedBuffer(view.buffer)) ;
+        ReadableByteStreamControllerRespondWithNewView(this._associatedReadableByteStreamController, view);
+    };
+    return ReadableStreamBYOBRequest;
+}());
+Object.defineProperties(ReadableStreamBYOBRequest.prototype, {
+    respond: { enumerable: true },
+    respondWithNewView: { enumerable: true },
+    view: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableStreamBYOBRequest.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableStreamBYOBRequest',
+        configurable: true
+    });
+}
+/**
+ * Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue.
+ *
+ * @public
+ */
+var ReadableByteStreamController = /** @class */ (function () {
+    function ReadableByteStreamController() {
+        throw new TypeError('Illegal constructor');
+    }
+    Object.defineProperty(ReadableByteStreamController.prototype, "byobRequest", {
+        /**
+         * Returns the current BYOB pull request, or `null` if there isn't one.
+         */
+        get: function () {
+            if (!IsReadableByteStreamController(this)) {
+                throw byteStreamControllerBrandCheckException('byobRequest');
+            }
+            return ReadableByteStreamControllerGetBYOBRequest(this);
+        },
+        enumerable: false,
+        configurable: true
+    });
+    Object.defineProperty(ReadableByteStreamController.prototype, "desiredSize", {
+        /**
+         * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is
+         * over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure.
+         */
+        get: function () {
+            if (!IsReadableByteStreamController(this)) {
+                throw byteStreamControllerBrandCheckException('desiredSize');
+            }
+            return ReadableByteStreamControllerGetDesiredSize(this);
+        },
+        enumerable: false,
+        configurable: true
+    });
+    /**
+     * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from
+     * the stream, but once those are read, the stream will become closed.
+     */
+    ReadableByteStreamController.prototype.close = function () {
+        if (!IsReadableByteStreamController(this)) {
+            throw byteStreamControllerBrandCheckException('close');
+        }
+        if (this._closeRequested) {
+            throw new TypeError('The stream has already been closed; do not close it again!');
+        }
+        var state = this._controlledReadableByteStream._state;
+        if (state !== 'readable') {
+            throw new TypeError("The stream (in " + state + " state) is not in the readable state and cannot be closed");
+        }
+        ReadableByteStreamControllerClose(this);
+    };
+    ReadableByteStreamController.prototype.enqueue = function (chunk) {
+        if (!IsReadableByteStreamController(this)) {
+            throw byteStreamControllerBrandCheckException('enqueue');
+        }
+        assertRequiredArgument(chunk, 1, 'enqueue');
+        if (!ArrayBuffer.isView(chunk)) {
+            throw new TypeError('chunk must be an array buffer view');
+        }
+        if (chunk.byteLength === 0) {
+            throw new TypeError('chunk must have non-zero byteLength');
+        }
+        if (chunk.buffer.byteLength === 0) {
+            throw new TypeError("chunk's buffer must have non-zero byteLength");
+        }
+        if (this._closeRequested) {
+            throw new TypeError('stream is closed or draining');
+        }
+        var state = this._controlledReadableByteStream._state;
+        if (state !== 'readable') {
+            throw new TypeError("The stream (in " + state + " state) is not in the readable state and cannot be enqueued to");
+        }
+        ReadableByteStreamControllerEnqueue(this, chunk);
+    };
+    /**
+     * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.
+     */
+    ReadableByteStreamController.prototype.error = function (e) {
+        if (e === void 0) { e = undefined; }
+        if (!IsReadableByteStreamController(this)) {
+            throw byteStreamControllerBrandCheckException('error');
+        }
+        ReadableByteStreamControllerError(this, e);
+    };
+    /** @internal */
+    ReadableByteStreamController.prototype[CancelSteps] = function (reason) {
+        ReadableByteStreamControllerClearPendingPullIntos(this);
+        ResetQueue(this);
+        var result = this._cancelAlgorithm(reason);
+        ReadableByteStreamControllerClearAlgorithms(this);
+        return result;
+    };
+    /** @internal */
+    ReadableByteStreamController.prototype[PullSteps] = function (readRequest) {
+        var stream = this._controlledReadableByteStream;
+        if (this._queueTotalSize > 0) {
+            var entry = this._queue.shift();
+            this._queueTotalSize -= entry.byteLength;
+            ReadableByteStreamControllerHandleQueueDrain(this);
+            var view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);
+            readRequest._chunkSteps(view);
+            return;
+        }
+        var autoAllocateChunkSize = this._autoAllocateChunkSize;
+        if (autoAllocateChunkSize !== undefined) {
+            var buffer = void 0;
+            try {
+                buffer = new ArrayBuffer(autoAllocateChunkSize);
+            }
+            catch (bufferE) {
+                readRequest._errorSteps(bufferE);
+                return;
+            }
+            var pullIntoDescriptor = {
+                buffer: buffer,
+                bufferByteLength: autoAllocateChunkSize,
+                byteOffset: 0,
+                byteLength: autoAllocateChunkSize,
+                bytesFilled: 0,
+                elementSize: 1,
+                viewConstructor: Uint8Array,
+                readerType: 'default'
+            };
+            this._pendingPullIntos.push(pullIntoDescriptor);
+        }
+        ReadableStreamAddReadRequest(stream, readRequest);
+        ReadableByteStreamControllerCallPullIfNeeded(this);
+    };
+    return ReadableByteStreamController;
+}());
+Object.defineProperties(ReadableByteStreamController.prototype, {
+    close: { enumerable: true },
+    enqueue: { enumerable: true },
+    error: { enumerable: true },
+    byobRequest: { enumerable: true },
+    desiredSize: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableByteStreamController.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableByteStreamController',
+        configurable: true
+    });
+}
+// Abstract operations for the ReadableByteStreamController.
+function IsReadableByteStreamController(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableByteStream')) {
+        return false;
+    }
+    return x instanceof ReadableByteStreamController;
+}
+function IsReadableStreamBYOBRequest(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_associatedReadableByteStreamController')) {
+        return false;
+    }
+    return x instanceof ReadableStreamBYOBRequest;
+}
+function ReadableByteStreamControllerCallPullIfNeeded(controller) {
+    var shouldPull = ReadableByteStreamControllerShouldCallPull(controller);
+    if (!shouldPull) {
+        return;
+    }
+    if (controller._pulling) {
+        controller._pullAgain = true;
+        return;
+    }
+    controller._pulling = true;
+    // TODO: Test controller argument
+    var pullPromise = controller._pullAlgorithm();
+    uponPromise(pullPromise, function () {
+        controller._pulling = false;
+        if (controller._pullAgain) {
+            controller._pullAgain = false;
+            ReadableByteStreamControllerCallPullIfNeeded(controller);
+        }
+    }, function (e) {
+        ReadableByteStreamControllerError(controller, e);
+    });
+}
+function ReadableByteStreamControllerClearPendingPullIntos(controller) {
+    ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+    controller._pendingPullIntos = new SimpleQueue();
+}
+function ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor) {
+    var done = false;
+    if (stream._state === 'closed') {
+        done = true;
+    }
+    var filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor);
+    if (pullIntoDescriptor.readerType === 'default') {
+        ReadableStreamFulfillReadRequest(stream, filledView, done);
+    }
+    else {
+        ReadableStreamFulfillReadIntoRequest(stream, filledView, done);
+    }
+}
+function ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor) {
+    var bytesFilled = pullIntoDescriptor.bytesFilled;
+    var elementSize = pullIntoDescriptor.elementSize;
+    return new pullIntoDescriptor.viewConstructor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize);
+}
+function ReadableByteStreamControllerEnqueueChunkToQueue(controller, buffer, byteOffset, byteLength) {
+    controller._queue.push({ buffer: buffer, byteOffset: byteOffset, byteLength: byteLength });
+    controller._queueTotalSize += byteLength;
+}
+function ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor) {
+    var elementSize = pullIntoDescriptor.elementSize;
+    var currentAlignedBytes = pullIntoDescriptor.bytesFilled - pullIntoDescriptor.bytesFilled % elementSize;
+    var maxBytesToCopy = Math.min(controller._queueTotalSize, pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled);
+    var maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;
+    var maxAlignedBytes = maxBytesFilled - maxBytesFilled % elementSize;
+    var totalBytesToCopyRemaining = maxBytesToCopy;
+    var ready = false;
+    if (maxAlignedBytes > currentAlignedBytes) {
+        totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled;
+        ready = true;
+    }
+    var queue = controller._queue;
+    while (totalBytesToCopyRemaining > 0) {
+        var headOfQueue = queue.peek();
+        var bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength);
+        var destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;
+        CopyDataBlockBytes(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy);
+        if (headOfQueue.byteLength === bytesToCopy) {
+            queue.shift();
+        }
+        else {
+            headOfQueue.byteOffset += bytesToCopy;
+            headOfQueue.byteLength -= bytesToCopy;
+        }
+        controller._queueTotalSize -= bytesToCopy;
+        ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor);
+        totalBytesToCopyRemaining -= bytesToCopy;
+    }
+    return ready;
+}
+function ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, size, pullIntoDescriptor) {
+    pullIntoDescriptor.bytesFilled += size;
+}
+function ReadableByteStreamControllerHandleQueueDrain(controller) {
+    if (controller._queueTotalSize === 0 && controller._closeRequested) {
+        ReadableByteStreamControllerClearAlgorithms(controller);
+        ReadableStreamClose(controller._controlledReadableByteStream);
+    }
+    else {
+        ReadableByteStreamControllerCallPullIfNeeded(controller);
+    }
+}
+function ReadableByteStreamControllerInvalidateBYOBRequest(controller) {
+    if (controller._byobRequest === null) {
+        return;
+    }
+    controller._byobRequest._associatedReadableByteStreamController = undefined;
+    controller._byobRequest._view = null;
+    controller._byobRequest = null;
+}
+function ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller) {
+    while (controller._pendingPullIntos.length > 0) {
+        if (controller._queueTotalSize === 0) {
+            return;
+        }
+        var pullIntoDescriptor = controller._pendingPullIntos.peek();
+        if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {
+            ReadableByteStreamControllerShiftPendingPullInto(controller);
+            ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);
+        }
+    }
+}
+function ReadableByteStreamControllerPullInto(controller, view, readIntoRequest) {
+    var stream = controller._controlledReadableByteStream;
+    var elementSize = 1;
+    if (view.constructor !== DataView) {
+        elementSize = view.constructor.BYTES_PER_ELEMENT;
+    }
+    var ctor = view.constructor;
+    // try {
+    var buffer = TransferArrayBuffer(view.buffer);
+    // } catch (e) {
+    //   readIntoRequest._errorSteps(e);
+    //   return;
+    // }
+    var pullIntoDescriptor = {
+        buffer: buffer,
+        bufferByteLength: buffer.byteLength,
+        byteOffset: view.byteOffset,
+        byteLength: view.byteLength,
+        bytesFilled: 0,
+        elementSize: elementSize,
+        viewConstructor: ctor,
+        readerType: 'byob'
+    };
+    if (controller._pendingPullIntos.length > 0) {
+        controller._pendingPullIntos.push(pullIntoDescriptor);
+        // No ReadableByteStreamControllerCallPullIfNeeded() call since:
+        // - No change happens on desiredSize
+        // - The source has already been notified of that there's at least 1 pending read(view)
+        ReadableStreamAddReadIntoRequest(stream, readIntoRequest);
+        return;
+    }
+    if (stream._state === 'closed') {
+        var emptyView = new ctor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0);
+        readIntoRequest._closeSteps(emptyView);
+        return;
+    }
+    if (controller._queueTotalSize > 0) {
+        if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {
+            var filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor);
+            ReadableByteStreamControllerHandleQueueDrain(controller);
+            readIntoRequest._chunkSteps(filledView);
+            return;
+        }
+        if (controller._closeRequested) {
+            var e = new TypeError('Insufficient bytes to fill elements in the given buffer');
+            ReadableByteStreamControllerError(controller, e);
+            readIntoRequest._errorSteps(e);
+            return;
+        }
+    }
+    controller._pendingPullIntos.push(pullIntoDescriptor);
+    ReadableStreamAddReadIntoRequest(stream, readIntoRequest);
+    ReadableByteStreamControllerCallPullIfNeeded(controller);
+}
+function ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor) {
+    var stream = controller._controlledReadableByteStream;
+    if (ReadableStreamHasBYOBReader(stream)) {
+        while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {
+            var pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);
+            ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);
+        }
+    }
+}
+function ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, pullIntoDescriptor) {
+    ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor);
+    if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {
+        return;
+    }
+    ReadableByteStreamControllerShiftPendingPullInto(controller);
+    var remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize;
+    if (remainderSize > 0) {
+        var end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;
+        var remainder = ArrayBufferSlice(pullIntoDescriptor.buffer, end - remainderSize, end);
+        ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength);
+    }
+    pullIntoDescriptor.bytesFilled -= remainderSize;
+    ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);
+    ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);
+}
+function ReadableByteStreamControllerRespondInternal(controller, bytesWritten) {
+    var firstDescriptor = controller._pendingPullIntos.peek();
+    ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+    var state = controller._controlledReadableByteStream._state;
+    if (state === 'closed') {
+        ReadableByteStreamControllerRespondInClosedState(controller);
+    }
+    else {
+        ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);
+    }
+    ReadableByteStreamControllerCallPullIfNeeded(controller);
+}
+function ReadableByteStreamControllerShiftPendingPullInto(controller) {
+    var descriptor = controller._pendingPullIntos.shift();
+    return descriptor;
+}
+function ReadableByteStreamControllerShouldCallPull(controller) {
+    var stream = controller._controlledReadableByteStream;
+    if (stream._state !== 'readable') {
+        return false;
+    }
+    if (controller._closeRequested) {
+        return false;
+    }
+    if (!controller._started) {
+        return false;
+    }
+    if (ReadableStreamHasDefaultReader(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+        return true;
+    }
+    if (ReadableStreamHasBYOBReader(stream) && ReadableStreamGetNumReadIntoRequests(stream) > 0) {
+        return true;
+    }
+    var desiredSize = ReadableByteStreamControllerGetDesiredSize(controller);
+    if (desiredSize > 0) {
+        return true;
+    }
+    return false;
+}
+function ReadableByteStreamControllerClearAlgorithms(controller) {
+    controller._pullAlgorithm = undefined;
+    controller._cancelAlgorithm = undefined;
+}
+// A client of ReadableByteStreamController may use these functions directly to bypass state check.
+function ReadableByteStreamControllerClose(controller) {
+    var stream = controller._controlledReadableByteStream;
+    if (controller._closeRequested || stream._state !== 'readable') {
+        return;
+    }
+    if (controller._queueTotalSize > 0) {
+        controller._closeRequested = true;
+        return;
+    }
+    if (controller._pendingPullIntos.length > 0) {
+        var firstPendingPullInto = controller._pendingPullIntos.peek();
+        if (firstPendingPullInto.bytesFilled > 0) {
+            var e = new TypeError('Insufficient bytes to fill elements in the given buffer');
+            ReadableByteStreamControllerError(controller, e);
+            throw e;
+        }
+    }
+    ReadableByteStreamControllerClearAlgorithms(controller);
+    ReadableStreamClose(stream);
+}
+function ReadableByteStreamControllerEnqueue(controller, chunk) {
+    var stream = controller._controlledReadableByteStream;
+    if (controller._closeRequested || stream._state !== 'readable') {
+        return;
+    }
+    var buffer = chunk.buffer;
+    var byteOffset = chunk.byteOffset;
+    var byteLength = chunk.byteLength;
+    var transferredBuffer = TransferArrayBuffer(buffer);
+    if (controller._pendingPullIntos.length > 0) {
+        var firstPendingPullInto = controller._pendingPullIntos.peek();
+        if (IsDetachedBuffer(firstPendingPullInto.buffer)) ;
+        firstPendingPullInto.buffer = TransferArrayBuffer(firstPendingPullInto.buffer);
+    }
+    ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+    if (ReadableStreamHasDefaultReader(stream)) {
+        if (ReadableStreamGetNumReadRequests(stream) === 0) {
+            ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+        }
+        else {
+            if (controller._pendingPullIntos.length > 0) {
+                ReadableByteStreamControllerShiftPendingPullInto(controller);
+            }
+            var transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength);
+            ReadableStreamFulfillReadRequest(stream, transferredView, false);
+        }
+    }
+    else if (ReadableStreamHasBYOBReader(stream)) {
+        // TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully.
+        ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+        ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);
+    }
+    else {
+        ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+    }
+    ReadableByteStreamControllerCallPullIfNeeded(controller);
+}
+function ReadableByteStreamControllerError(controller, e) {
+    var stream = controller._controlledReadableByteStream;
+    if (stream._state !== 'readable') {
+        return;
+    }
+    ReadableByteStreamControllerClearPendingPullIntos(controller);
+    ResetQueue(controller);
+    ReadableByteStreamControllerClearAlgorithms(controller);
+    ReadableStreamError(stream, e);
+}
+function ReadableByteStreamControllerGetBYOBRequest(controller) {
+    if (controller._byobRequest === null && controller._pendingPullIntos.length > 0) {
+        var firstDescriptor = controller._pendingPullIntos.peek();
+        var view = new Uint8Array(firstDescriptor.buffer, firstDescriptor.byteOffset + firstDescriptor.bytesFilled, firstDescriptor.byteLength - firstDescriptor.bytesFilled);
+        var byobRequest = Object.create(ReadableStreamBYOBRequest.prototype);
+        SetUpReadableStreamBYOBRequest(byobRequest, controller, view);
+        controller._byobRequest = byobRequest;
+    }
+    return controller._byobRequest;
+}
+function ReadableByteStreamControllerGetDesiredSize(controller) {
+    var state = controller._controlledReadableByteStream._state;
+    if (state === 'errored') {
+        return null;
+    }
+    if (state === 'closed') {
+        return 0;
+    }
+    return controller._strategyHWM - controller._queueTotalSize;
+}
+function ReadableByteStreamControllerRespond(controller, bytesWritten) {
+    var firstDescriptor = controller._pendingPullIntos.peek();
+    var state = controller._controlledReadableByteStream._state;
+    if (state === 'closed') {
+        if (bytesWritten !== 0) {
+            throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream');
+        }
+    }
+    else {
+        if (bytesWritten === 0) {
+            throw new TypeError('bytesWritten must be greater than 0 when calling respond() on a readable stream');
+        }
+        if (firstDescriptor.bytesFilled + bytesWritten > firstDescriptor.byteLength) {
+            throw new RangeError('bytesWritten out of range');
+        }
+    }
+    firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer);
+    ReadableByteStreamControllerRespondInternal(controller, bytesWritten);
+}
+function ReadableByteStreamControllerRespondWithNewView(controller, view) {
+    var firstDescriptor = controller._pendingPullIntos.peek();
+    var state = controller._controlledReadableByteStream._state;
+    if (state === 'closed') {
+        if (view.byteLength !== 0) {
+            throw new TypeError('The view\'s length must be 0 when calling respondWithNewView() on a closed stream');
+        }
+    }
+    else {
+        if (view.byteLength === 0) {
+            throw new TypeError('The view\'s length must be greater than 0 when calling respondWithNewView() on a readable stream');
+        }
+    }
+    if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) {
+        throw new RangeError('The region specified by view does not match byobRequest');
+    }
+    if (firstDescriptor.bufferByteLength !== view.buffer.byteLength) {
+        throw new RangeError('The buffer of view has different capacity than byobRequest');
+    }
+    if (firstDescriptor.bytesFilled + view.byteLength > firstDescriptor.byteLength) {
+        throw new RangeError('The region specified by view is larger than byobRequest');
+    }
+    var viewByteLength = view.byteLength;
+    firstDescriptor.buffer = TransferArrayBuffer(view.buffer);
+    ReadableByteStreamControllerRespondInternal(controller, viewByteLength);
+}
+function SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize) {
+    controller._controlledReadableByteStream = stream;
+    controller._pullAgain = false;
+    controller._pulling = false;
+    controller._byobRequest = null;
+    // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.
+    controller._queue = controller._queueTotalSize = undefined;
+    ResetQueue(controller);
+    controller._closeRequested = false;
+    controller._started = false;
+    controller._strategyHWM = highWaterMark;
+    controller._pullAlgorithm = pullAlgorithm;
+    controller._cancelAlgorithm = cancelAlgorithm;
+    controller._autoAllocateChunkSize = autoAllocateChunkSize;
+    controller._pendingPullIntos = new SimpleQueue();
+    stream._readableStreamController = controller;
+    var startResult = startAlgorithm();
+    uponPromise(promiseResolvedWith(startResult), function () {
+        controller._started = true;
+        ReadableByteStreamControllerCallPullIfNeeded(controller);
+    }, function (r) {
+        ReadableByteStreamControllerError(controller, r);
+    });
+}
+function SetUpReadableByteStreamControllerFromUnderlyingSource(stream, underlyingByteSource, highWaterMark) {
+    var controller = Object.create(ReadableByteStreamController.prototype);
+    var startAlgorithm = function () { return undefined; };
+    var pullAlgorithm = function () { return promiseResolvedWith(undefined); };
+    var cancelAlgorithm = function () { return promiseResolvedWith(undefined); };
+    if (underlyingByteSource.start !== undefined) {
+        startAlgorithm = function () { return underlyingByteSource.start(controller); };
+    }
+    if (underlyingByteSource.pull !== undefined) {
+        pullAlgorithm = function () { return underlyingByteSource.pull(controller); };
+    }
+    if (underlyingByteSource.cancel !== undefined) {
+        cancelAlgorithm = function (reason) { return underlyingByteSource.cancel(reason); };
+    }
+    var autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;
+    if (autoAllocateChunkSize === 0) {
+        throw new TypeError('autoAllocateChunkSize must be greater than 0');
+    }
+    SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize);
+}
+function SetUpReadableStreamBYOBRequest(request, controller, view) {
+    request._associatedReadableByteStreamController = controller;
+    request._view = view;
+}
+// Helper functions for the ReadableStreamBYOBRequest.
+function byobRequestBrandCheckException(name) {
+    return new TypeError("ReadableStreamBYOBRequest.prototype." + name + " can only be used on a ReadableStreamBYOBRequest");
+}
+// Helper functions for the ReadableByteStreamController.
+function byteStreamControllerBrandCheckException(name) {
+    return new TypeError("ReadableByteStreamController.prototype." + name + " can only be used on a ReadableByteStreamController");
+}
+
+// Abstract operations for the ReadableStream.
+function AcquireReadableStreamBYOBReader(stream) {
+    return new ReadableStreamBYOBReader(stream);
+}
+// ReadableStream API exposed for controllers.
+function ReadableStreamAddReadIntoRequest(stream, readIntoRequest) {
+    stream._reader._readIntoRequests.push(readIntoRequest);
+}
+function ReadableStreamFulfillReadIntoRequest(stream, chunk, done) {
+    var reader = stream._reader;
+    var readIntoRequest = reader._readIntoRequests.shift();
+    if (done) {
+        readIntoRequest._closeSteps(chunk);
+    }
+    else {
+        readIntoRequest._chunkSteps(chunk);
+    }
+}
+function ReadableStreamGetNumReadIntoRequests(stream) {
+    return stream._reader._readIntoRequests.length;
+}
+function ReadableStreamHasBYOBReader(stream) {
+    var reader = stream._reader;
+    if (reader === undefined) {
+        return false;
+    }
+    if (!IsReadableStreamBYOBReader(reader)) {
+        return false;
+    }
+    return true;
+}
+/**
+ * A BYOB reader vended by a {@link ReadableStream}.
+ *
+ * @public
+ */
+var ReadableStreamBYOBReader = /** @class */ (function () {
+    function ReadableStreamBYOBReader(stream) {
+        assertRequiredArgument(stream, 1, 'ReadableStreamBYOBReader');
+        assertReadableStream(stream, 'First parameter');
+        if (IsReadableStreamLocked(stream)) {
+            throw new TypeError('This stream has already been locked for exclusive reading by another reader');
+        }
+        if (!IsReadableByteStreamController(stream._readableStreamController)) {
+            throw new TypeError('Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte ' +
+                'source');
+        }
+        ReadableStreamReaderGenericInitialize(this, stream);
+        this._readIntoRequests = new SimpleQueue();
+    }
+    Object.defineProperty(ReadableStreamBYOBReader.prototype, "closed", {
+        /**
+         * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or
+         * the reader's lock is released before the stream finishes closing.
+         */
+        get: function () {
+            if (!IsReadableStreamBYOBReader(this)) {
+                return promiseRejectedWith(byobReaderBrandCheckException('closed'));
+            }
+            return this._closedPromise;
+        },
+        enumerable: false,
+        configurable: true
+    });
+    /**
+     * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.
+     */
+    ReadableStreamBYOBReader.prototype.cancel = function (reason) {
+        if (reason === void 0) { reason = undefined; }
+        if (!IsReadableStreamBYOBReader(this)) {
+            return promiseRejectedWith(byobReaderBrandCheckException('cancel'));
+        }
+        if (this._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('cancel'));
+        }
+        return ReadableStreamReaderGenericCancel(this, reason);
+    };
+    /**
+     * Attempts to reads bytes into view, and returns a promise resolved with the result.
+     *
+     * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.
+     */
+    ReadableStreamBYOBReader.prototype.read = function (view) {
+        if (!IsReadableStreamBYOBReader(this)) {
+            return promiseRejectedWith(byobReaderBrandCheckException('read'));
+        }
+        if (!ArrayBuffer.isView(view)) {
+            return promiseRejectedWith(new TypeError('view must be an array buffer view'));
+        }
+        if (view.byteLength === 0) {
+            return promiseRejectedWith(new TypeError('view must have non-zero byteLength'));
+        }
+        if (view.buffer.byteLength === 0) {
+            return promiseRejectedWith(new TypeError("view's buffer must have non-zero byteLength"));
+        }
+        if (IsDetachedBuffer(view.buffer)) ;
+        if (this._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('read from'));
+        }
+        var resolvePromise;
+        var rejectPromise;
+        var promise = newPromise(function (resolve, reject) {
+            resolvePromise = resolve;
+            rejectPromise = reject;
+        });
+        var readIntoRequest = {
+            _chunkSteps: function (chunk) { return resolvePromise({ value: chunk, done: false }); },
+            _closeSteps: function (chunk) { return resolvePromise({ value: chunk, done: true }); },
+            _errorSteps: function (e) { return rejectPromise(e); }
+        };
+        ReadableStreamBYOBReaderRead(this, view, readIntoRequest);
+        return promise;
+    };
+    /**
+     * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.
+     * If the associated stream is errored when the lock is released, the reader will appear errored in the same way
+     * from now on; otherwise, the reader will appear closed.
+     *
+     * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by
+     * the reader's {@link ReadableStreamBYOBReader.read | read()} method has not yet been settled. Attempting to
+     * do so will throw a `TypeError` and leave the reader locked to the stream.
+     */
+    ReadableStreamBYOBReader.prototype.releaseLock = function () {
+        if (!IsReadableStreamBYOBReader(this)) {
+            throw byobReaderBrandCheckException('releaseLock');
+        }
+        if (this._ownerReadableStream === undefined) {
+            return;
+        }
+        if (this._readIntoRequests.length > 0) {
+            throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');
+        }
+        ReadableStreamReaderGenericRelease(this);
+    };
+    return ReadableStreamBYOBReader;
+}());
+Object.defineProperties(ReadableStreamBYOBReader.prototype, {
+    cancel: { enumerable: true },
+    read: { enumerable: true },
+    releaseLock: { enumerable: true },
+    closed: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableStreamBYOBReader.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableStreamBYOBReader',
+        configurable: true
+    });
+}
+// Abstract operations for the readers.
+function IsReadableStreamBYOBReader(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_readIntoRequests')) {
+        return false;
+    }
+    return x instanceof ReadableStreamBYOBReader;
+}
+function ReadableStreamBYOBReaderRead(reader, view, readIntoRequest) {
+    var stream = reader._ownerReadableStream;
+    stream._disturbed = true;
+    if (stream._state === 'errored') {
+        readIntoRequest._errorSteps(stream._storedError);
+    }
+    else {
+        ReadableByteStreamControllerPullInto(stream._readableStreamController, view, readIntoRequest);
+    }
+}
+// Helper functions for the ReadableStreamBYOBReader.
+function byobReaderBrandCheckException(name) {
+    return new TypeError("ReadableStreamBYOBReader.prototype." + name + " can only be used on a ReadableStreamBYOBReader");
+}
+
+function ExtractHighWaterMark(strategy, defaultHWM) {
+    var highWaterMark = strategy.highWaterMark;
+    if (highWaterMark === undefined) {
+        return defaultHWM;
+    }
+    if (NumberIsNaN(highWaterMark) || highWaterMark < 0) {
+        throw new RangeError('Invalid highWaterMark');
+    }
+    return highWaterMark;
+}
+function ExtractSizeAlgorithm(strategy) {
+    var size = strategy.size;
+    if (!size) {
+        return function () { return 1; };
+    }
+    return size;
+}
+
+function convertQueuingStrategy(init, context) {
+    assertDictionary(init, context);
+    var highWaterMark = init === null || init === void 0 ? void 0 : init.highWaterMark;
+    var size = init === null || init === void 0 ? void 0 : init.size;
+    return {
+        highWaterMark: highWaterMark === undefined ? undefined : convertUnrestrictedDouble(highWaterMark),
+        size: size === undefined ? undefined : convertQueuingStrategySize(size, context + " has member 'size' that")
+    };
+}
+function convertQueuingStrategySize(fn, context) {
+    assertFunction(fn, context);
+    return function (chunk) { return convertUnrestrictedDouble(fn(chunk)); };
+}
+
+function convertUnderlyingSink(original, context) {
+    assertDictionary(original, context);
+    var abort = original === null || original === void 0 ? void 0 : original.abort;
+    var close = original === null || original === void 0 ? void 0 : original.close;
+    var start = original === null || original === void 0 ? void 0 : original.start;
+    var type = original === null || original === void 0 ? void 0 : original.type;
+    var write = original === null || original === void 0 ? void 0 : original.write;
+    return {
+        abort: abort === undefined ?
+            undefined :
+            convertUnderlyingSinkAbortCallback(abort, original, context + " has member 'abort' that"),
+        close: close === undefined ?
+            undefined :
+            convertUnderlyingSinkCloseCallback(close, original, context + " has member 'close' that"),
+        start: start === undefined ?
+            undefined :
+            convertUnderlyingSinkStartCallback(start, original, context + " has member 'start' that"),
+        write: write === undefined ?
+            undefined :
+            convertUnderlyingSinkWriteCallback(write, original, context + " has member 'write' that"),
+        type: type
+    };
+}
+function convertUnderlyingSinkAbortCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return function (reason) { return promiseCall(fn, original, [reason]); };
+}
+function convertUnderlyingSinkCloseCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return function () { return promiseCall(fn, original, []); };
+}
+function convertUnderlyingSinkStartCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return function (controller) { return reflectCall(fn, original, [controller]); };
+}
+function convertUnderlyingSinkWriteCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return function (chunk, controller) { return promiseCall(fn, original, [chunk, controller]); };
+}
+
+function assertWritableStream(x, context) {
+    if (!IsWritableStream(x)) {
+        throw new TypeError(context + " is not a WritableStream.");
+    }
+}
+
+function isAbortSignal(value) {
+    if (typeof value !== 'object' || value === null) {
+        return false;
+    }
+    try {
+        return typeof value.aborted === 'boolean';
+    }
+    catch (_a) {
+        // AbortSignal.prototype.aborted throws if its brand check fails
+        return false;
+    }
+}
+var supportsAbortController = typeof AbortController === 'function';
+/**
+ * Construct a new AbortController, if supported by the platform.
+ *
+ * @internal
+ */
+function createAbortController() {
+    if (supportsAbortController) {
+        return new AbortController();
+    }
+    return undefined;
+}
+
+/**
+ * A writable stream represents a destination for data, into which you can write.
+ *
+ * @public
+ */
+var WritableStream = /** @class */ (function () {
+    function WritableStream(rawUnderlyingSink, rawStrategy) {
+        if (rawUnderlyingSink === void 0) { rawUnderlyingSink = {}; }
+        if (rawStrategy === void 0) { rawStrategy = {}; }
+        if (rawUnderlyingSink === undefined) {
+            rawUnderlyingSink = null;
+        }
+        else {
+            assertObject(rawUnderlyingSink, 'First parameter');
+        }
+        var strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');
+        var underlyingSink = convertUnderlyingSink(rawUnderlyingSink, 'First parameter');
+        InitializeWritableStream(this);
+        var type = underlyingSink.type;
+        if (type !== undefined) {
+            throw new RangeError('Invalid type is specified');
+        }
+        var sizeAlgorithm = ExtractSizeAlgorithm(strategy);
+        var highWaterMark = ExtractHighWaterMark(strategy, 1);
+        SetUpWritableStreamDefaultControllerFromUnderlyingSink(this, underlyingSink, highWaterMark, sizeAlgorithm);
+    }
+    Object.defineProperty(WritableStream.prototype, "locked", {
+        /**
+         * Returns whether or not the writable stream is locked to a writer.
+         */
+        get: function () {
+            if (!IsWritableStream(this)) {
+                throw streamBrandCheckException$2('locked');
+            }
+            return IsWritableStreamLocked(this);
+        },
+        enumerable: false,
+        configurable: true
+    });
+    /**
+     * Aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be
+     * immediately moved to an errored state, with any queued-up writes discarded. This will also execute any abort
+     * mechanism of the underlying sink.
+     *
+     * The returned promise will fulfill if the stream shuts down successfully, or reject if the underlying sink signaled
+     * that there was an error doing so. Additionally, it will reject with a `TypeError` (without attempting to cancel
+     * the stream) if the stream is currently locked.
+     */
+    WritableStream.prototype.abort = function (reason) {
+        if (reason === void 0) { reason = undefined; }
+        if (!IsWritableStream(this)) {
+            return promiseRejectedWith(streamBrandCheckException$2('abort'));
+        }
+        if (IsWritableStreamLocked(this)) {
+            return promiseRejectedWith(new TypeError('Cannot abort a stream that already has a writer'));
+        }
+        return WritableStreamAbort(this, reason);
+    };
+    /**
+     * Closes the stream. The underlying sink will finish processing any previously-written chunks, before invoking its
+     * close behavior. During this time any further attempts to write will fail (without erroring the stream).
+     *
+     * The method returns a promise that will fulfill if all remaining chunks are successfully written and the stream
+     * successfully closes, or rejects if an error is encountered during this process. Additionally, it will reject with
+     * a `TypeError` (without attempting to cancel the stream) if the stream is currently locked.
+     */
+    WritableStream.prototype.close = function () {
+        if (!IsWritableStream(this)) {
+            return promiseRejectedWith(streamBrandCheckException$2('close'));
+        }
+        if (IsWritableStreamLocked(this)) {
+            return promiseRejectedWith(new TypeError('Cannot close a stream that already has a writer'));
+        }
+        if (WritableStreamCloseQueuedOrInFlight(this)) {
+            return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));
+        }
+        return WritableStreamClose(this);
+    };
+    /**
+     * Creates a {@link WritableStreamDefaultWriter | writer} and locks the stream to the new writer. While the stream
+     * is locked, no other writer can be acquired until this one is released.
+     *
+     * This functionality is especially useful for creating abstractions that desire the ability to write to a stream
+     * without interruption or interleaving. By getting a writer for the stream, you can ensure nobody else can write at
+     * the same time, which would cause the resulting written data to be unpredictable and probably useless.
+     */
+    WritableStream.prototype.getWriter = function () {
+        if (!IsWritableStream(this)) {
+            throw streamBrandCheckException$2('getWriter');
+        }
+        return AcquireWritableStreamDefaultWriter(this);
+    };
+    return WritableStream;
+}());
+Object.defineProperties(WritableStream.prototype, {
+    abort: { enumerable: true },
+    close: { enumerable: true },
+    getWriter: { enumerable: true },
+    locked: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(WritableStream.prototype, SymbolPolyfill.toStringTag, {
+        value: 'WritableStream',
+        configurable: true
+    });
+}
+// Abstract operations for the WritableStream.
+function AcquireWritableStreamDefaultWriter(stream) {
+    return new WritableStreamDefaultWriter(stream);
+}
+// Throws if and only if startAlgorithm throws.
+function CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm) {
+    if (highWaterMark === void 0) { highWaterMark = 1; }
+    if (sizeAlgorithm === void 0) { sizeAlgorithm = function () { return 1; }; }
+    var stream = Object.create(WritableStream.prototype);
+    InitializeWritableStream(stream);
+    var controller = Object.create(WritableStreamDefaultController.prototype);
+    SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm);
+    return stream;
+}
+function InitializeWritableStream(stream) {
+    stream._state = 'writable';
+    // The error that will be reported by new method calls once the state becomes errored. Only set when [[state]] is
+    // 'erroring' or 'errored'. May be set to an undefined value.
+    stream._storedError = undefined;
+    stream._writer = undefined;
+    // Initialize to undefined first because the constructor of the controller checks this
+    // variable to validate the caller.
+    stream._writableStreamController = undefined;
+    // This queue is placed here instead of the writer class in order to allow for passing a writer to the next data
+    // producer without waiting for the queued writes to finish.
+    stream._writeRequests = new SimpleQueue();
+    // Write requests are removed from _writeRequests when write() is called on the underlying sink. This prevents
+    // them from being erroneously rejected on error. If a write() call is in-flight, the request is stored here.
+    stream._inFlightWriteRequest = undefined;
+    // The promise that was returned from writer.close(). Stored here because it may be fulfilled after the writer
+    // has been detached.
+    stream._closeRequest = undefined;
+    // Close request is removed from _closeRequest when close() is called on the underlying sink. This prevents it
+    // from being erroneously rejected on error. If a close() call is in-flight, the request is stored here.
+    stream._inFlightCloseRequest = undefined;
+    // The promise that was returned from writer.abort(). This may also be fulfilled after the writer has detached.
+    stream._pendingAbortRequest = undefined;
+    // The backpressure signal set by the controller.
+    stream._backpressure = false;
+}
+function IsWritableStream(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_writableStreamController')) {
+        return false;
+    }
+    return x instanceof WritableStream;
+}
+function IsWritableStreamLocked(stream) {
+    if (stream._writer === undefined) {
+        return false;
+    }
+    return true;
+}
+function WritableStreamAbort(stream, reason) {
+    var _a;
+    if (stream._state === 'closed' || stream._state === 'errored') {
+        return promiseResolvedWith(undefined);
+    }
+    stream._writableStreamController._abortReason = reason;
+    (_a = stream._writableStreamController._abortController) === null || _a === void 0 ? void 0 : _a.abort();
+    // TypeScript narrows the type of `stream._state` down to 'writable' | 'erroring',
+    // but it doesn't know that signaling abort runs author code that might have changed the state.
+    // Widen the type again by casting to WritableStreamState.
+    var state = stream._state;
+    if (state === 'closed' || state === 'errored') {
+        return promiseResolvedWith(undefined);
+    }
+    if (stream._pendingAbortRequest !== undefined) {
+        return stream._pendingAbortRequest._promise;
+    }
+    var wasAlreadyErroring = false;
+    if (state === 'erroring') {
+        wasAlreadyErroring = true;
+        // reason will not be used, so don't keep a reference to it.
+        reason = undefined;
+    }
+    var promise = newPromise(function (resolve, reject) {
+        stream._pendingAbortRequest = {
+            _promise: undefined,
+            _resolve: resolve,
+            _reject: reject,
+            _reason: reason,
+            _wasAlreadyErroring: wasAlreadyErroring
+        };
+    });
+    stream._pendingAbortRequest._promise = promise;
+    if (!wasAlreadyErroring) {
+        WritableStreamStartErroring(stream, reason);
+    }
+    return promise;
+}
+function WritableStreamClose(stream) {
+    var state = stream._state;
+    if (state === 'closed' || state === 'errored') {
+        return promiseRejectedWith(new TypeError("The stream (in " + state + " state) is not in the writable state and cannot be closed"));
+    }
+    var promise = newPromise(function (resolve, reject) {
+        var closeRequest = {
+            _resolve: resolve,
+            _reject: reject
+        };
+        stream._closeRequest = closeRequest;
+    });
+    var writer = stream._writer;
+    if (writer !== undefined && stream._backpressure && state === 'writable') {
+        defaultWriterReadyPromiseResolve(writer);
+    }
+    WritableStreamDefaultControllerClose(stream._writableStreamController);
+    return promise;
+}
+// WritableStream API exposed for controllers.
+function WritableStreamAddWriteRequest(stream) {
+    var promise = newPromise(function (resolve, reject) {
+        var writeRequest = {
+            _resolve: resolve,
+            _reject: reject
+        };
+        stream._writeRequests.push(writeRequest);
+    });
+    return promise;
+}
+function WritableStreamDealWithRejection(stream, error) {
+    var state = stream._state;
+    if (state === 'writable') {
+        WritableStreamStartErroring(stream, error);
+        return;
+    }
+    WritableStreamFinishErroring(stream);
+}
+function WritableStreamStartErroring(stream, reason) {
+    var controller = stream._writableStreamController;
+    stream._state = 'erroring';
+    stream._storedError = reason;
+    var writer = stream._writer;
+    if (writer !== undefined) {
+        WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);
+    }
+    if (!WritableStreamHasOperationMarkedInFlight(stream) && controller._started) {
+        WritableStreamFinishErroring(stream);
+    }
+}
+function WritableStreamFinishErroring(stream) {
+    stream._state = 'errored';
+    stream._writableStreamController[ErrorSteps]();
+    var storedError = stream._storedError;
+    stream._writeRequests.forEach(function (writeRequest) {
+        writeRequest._reject(storedError);
+    });
+    stream._writeRequests = new SimpleQueue();
+    if (stream._pendingAbortRequest === undefined) {
+        WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+        return;
+    }
+    var abortRequest = stream._pendingAbortRequest;
+    stream._pendingAbortRequest = undefined;
+    if (abortRequest._wasAlreadyErroring) {
+        abortRequest._reject(storedError);
+        WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+        return;
+    }
+    var promise = stream._writableStreamController[AbortSteps](abortRequest._reason);
+    uponPromise(promise, function () {
+        abortRequest._resolve();
+        WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+    }, function (reason) {
+        abortRequest._reject(reason);
+        WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+    });
+}
+function WritableStreamFinishInFlightWrite(stream) {
+    stream._inFlightWriteRequest._resolve(undefined);
+    stream._inFlightWriteRequest = undefined;
+}
+function WritableStreamFinishInFlightWriteWithError(stream, error) {
+    stream._inFlightWriteRequest._reject(error);
+    stream._inFlightWriteRequest = undefined;
+    WritableStreamDealWithRejection(stream, error);
+}
+function WritableStreamFinishInFlightClose(stream) {
+    stream._inFlightCloseRequest._resolve(undefined);
+    stream._inFlightCloseRequest = undefined;
+    var state = stream._state;
+    if (state === 'erroring') {
+        // The error was too late to do anything, so it is ignored.
+        stream._storedError = undefined;
+        if (stream._pendingAbortRequest !== undefined) {
+            stream._pendingAbortRequest._resolve();
+            stream._pendingAbortRequest = undefined;
+        }
+    }
+    stream._state = 'closed';
+    var writer = stream._writer;
+    if (writer !== undefined) {
+        defaultWriterClosedPromiseResolve(writer);
+    }
+}
+function WritableStreamFinishInFlightCloseWithError(stream, error) {
+    stream._inFlightCloseRequest._reject(error);
+    stream._inFlightCloseRequest = undefined;
+    // Never execute sink abort() after sink close().
+    if (stream._pendingAbortRequest !== undefined) {
+        stream._pendingAbortRequest._reject(error);
+        stream._pendingAbortRequest = undefined;
+    }
+    WritableStreamDealWithRejection(stream, error);
+}
+// TODO(ricea): Fix alphabetical order.
+function WritableStreamCloseQueuedOrInFlight(stream) {
+    if (stream._closeRequest === undefined && stream._inFlightCloseRequest === undefined) {
+        return false;
+    }
+    return true;
+}
+function WritableStreamHasOperationMarkedInFlight(stream) {
+    if (stream._inFlightWriteRequest === undefined && stream._inFlightCloseRequest === undefined) {
+        return false;
+    }
+    return true;
+}
+function WritableStreamMarkCloseRequestInFlight(stream) {
+    stream._inFlightCloseRequest = stream._closeRequest;
+    stream._closeRequest = undefined;
+}
+function WritableStreamMarkFirstWriteRequestInFlight(stream) {
+    stream._inFlightWriteRequest = stream._writeRequests.shift();
+}
+function WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream) {
+    if (stream._closeRequest !== undefined) {
+        stream._closeRequest._reject(stream._storedError);
+        stream._closeRequest = undefined;
+    }
+    var writer = stream._writer;
+    if (writer !== undefined) {
+        defaultWriterClosedPromiseReject(writer, stream._storedError);
+    }
+}
+function WritableStreamUpdateBackpressure(stream, backpressure) {
+    var writer = stream._writer;
+    if (writer !== undefined && backpressure !== stream._backpressure) {
+        if (backpressure) {
+            defaultWriterReadyPromiseReset(writer);
+        }
+        else {
+            defaultWriterReadyPromiseResolve(writer);
+        }
+    }
+    stream._backpressure = backpressure;
+}
+/**
+ * A default writer vended by a {@link WritableStream}.
+ *
+ * @public
+ */
+var WritableStreamDefaultWriter = /** @class */ (function () {
+    function WritableStreamDefaultWriter(stream) {
+        assertRequiredArgument(stream, 1, 'WritableStreamDefaultWriter');
+        assertWritableStream(stream, 'First parameter');
+        if (IsWritableStreamLocked(stream)) {
+            throw new TypeError('This stream has already been locked for exclusive writing by another writer');
+        }
+        this._ownerWritableStream = stream;
+        stream._writer = this;
+        var state = stream._state;
+        if (state === 'writable') {
+            if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._backpressure) {
+                defaultWriterReadyPromiseInitialize(this);
+            }
+            else {
+                defaultWriterReadyPromiseInitializeAsResolved(this);
+            }
+            defaultWriterClosedPromiseInitialize(this);
+        }
+        else if (state === 'erroring') {
+            defaultWriterReadyPromiseInitializeAsRejected(this, stream._storedError);
+            defaultWriterClosedPromiseInitialize(this);
+        }
+        else if (state === 'closed') {
+            defaultWriterReadyPromiseInitializeAsResolved(this);
+            defaultWriterClosedPromiseInitializeAsResolved(this);
+        }
+        else {
+            var storedError = stream._storedError;
+            defaultWriterReadyPromiseInitializeAsRejected(this, storedError);
+            defaultWriterClosedPromiseInitializeAsRejected(this, storedError);
+        }
+    }
+    Object.defineProperty(WritableStreamDefaultWriter.prototype, "closed", {
+        /**
+         * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or
+         * the writer’s lock is released before the stream finishes closing.
+         */
+        get: function () {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                return promiseRejectedWith(defaultWriterBrandCheckException('closed'));
+            }
+            return this._closedPromise;
+        },
+        enumerable: false,
+        configurable: true
+    });
+    Object.defineProperty(WritableStreamDefaultWriter.prototype, "desiredSize", {
+        /**
+         * Returns the desired size to fill the stream’s internal queue. It can be negative, if the queue is over-full.
+         * A producer can use this information to determine the right amount of data to write.
+         *
+         * It will be `null` if the stream cannot be successfully written to (due to either being errored, or having an abort
+         * queued up). It will return zero if the stream is closed. And the getter will throw an exception if invoked when
+         * the writer’s lock is released.
+         */
+        get: function () {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                throw defaultWriterBrandCheckException('desiredSize');
+            }
+            if (this._ownerWritableStream === undefined) {
+                throw defaultWriterLockException('desiredSize');
+            }
+            return WritableStreamDefaultWriterGetDesiredSize(this);
+        },
+        enumerable: false,
+        configurable: true
+    });
+    Object.defineProperty(WritableStreamDefaultWriter.prototype, "ready", {
+        /**
+         * Returns a promise that will be fulfilled when the desired size to fill the stream’s internal queue transitions
+         * from non-positive to positive, signaling that it is no longer applying backpressure. Once the desired size dips
+         * back to zero or below, the getter will return a new promise that stays pending until the next transition.
+         *
+         * If the stream becomes errored or aborted, or the writer’s lock is released, the returned promise will become
+         * rejected.
+         */
+        get: function () {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                return promiseRejectedWith(defaultWriterBrandCheckException('ready'));
+            }
+            return this._readyPromise;
+        },
+        enumerable: false,
+        configurable: true
+    });
+    /**
+     * If the reader is active, behaves the same as {@link WritableStream.abort | stream.abort(reason)}.
+     */
+    WritableStreamDefaultWriter.prototype.abort = function (reason) {
+        if (reason === void 0) { reason = undefined; }
+        if (!IsWritableStreamDefaultWriter(this)) {
+            return promiseRejectedWith(defaultWriterBrandCheckException('abort'));
+        }
+        if (this._ownerWritableStream === undefined) {
+            return promiseRejectedWith(defaultWriterLockException('abort'));
+        }
+        return WritableStreamDefaultWriterAbort(this, reason);
+    };
+    /**
+     * If the reader is active, behaves the same as {@link WritableStream.close | stream.close()}.
+     */
+    WritableStreamDefaultWriter.prototype.close = function () {
+        if (!IsWritableStreamDefaultWriter(this)) {
+            return promiseRejectedWith(defaultWriterBrandCheckException('close'));
+        }
+        var stream = this._ownerWritableStream;
+        if (stream === undefined) {
+            return promiseRejectedWith(defaultWriterLockException('close'));
+        }
+        if (WritableStreamCloseQueuedOrInFlight(stream)) {
+            return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));
+        }
+        return WritableStreamDefaultWriterClose(this);
+    };
+    /**
+     * Releases the writer’s lock on the corresponding stream. After the lock is released, the writer is no longer active.
+     * If the associated stream is errored when the lock is released, the writer will appear errored in the same way from
+     * now on; otherwise, the writer will appear closed.
+     *
+     * Note that the lock can still be released even if some ongoing writes have not yet finished (i.e. even if the
+     * promises returned from previous calls to {@link WritableStreamDefaultWriter.write | write()} have not yet settled).
+     * It’s not necessary to hold the lock on the writer for the duration of the write; the lock instead simply prevents
+     * other producers from writing in an interleaved manner.
+     */
+    WritableStreamDefaultWriter.prototype.releaseLock = function () {
+        if (!IsWritableStreamDefaultWriter(this)) {
+            throw defaultWriterBrandCheckException('releaseLock');
+        }
+        var stream = this._ownerWritableStream;
+        if (stream === undefined) {
+            return;
+        }
+        WritableStreamDefaultWriterRelease(this);
+    };
+    WritableStreamDefaultWriter.prototype.write = function (chunk) {
+        if (chunk === void 0) { chunk = undefined; }
+        if (!IsWritableStreamDefaultWriter(this)) {
+            return promiseRejectedWith(defaultWriterBrandCheckException('write'));
+        }
+        if (this._ownerWritableStream === undefined) {
+            return promiseRejectedWith(defaultWriterLockException('write to'));
+        }
+        return WritableStreamDefaultWriterWrite(this, chunk);
+    };
+    return WritableStreamDefaultWriter;
+}());
+Object.defineProperties(WritableStreamDefaultWriter.prototype, {
+    abort: { enumerable: true },
+    close: { enumerable: true },
+    releaseLock: { enumerable: true },
+    write: { enumerable: true },
+    closed: { enumerable: true },
+    desiredSize: { enumerable: true },
+    ready: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(WritableStreamDefaultWriter.prototype, SymbolPolyfill.toStringTag, {
+        value: 'WritableStreamDefaultWriter',
+        configurable: true
+    });
+}
+// Abstract operations for the WritableStreamDefaultWriter.
+function IsWritableStreamDefaultWriter(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) {
+        return false;
+    }
+    return x instanceof WritableStreamDefaultWriter;
+}
+// A client of WritableStreamDefaultWriter may use these functions directly to bypass state check.
+function WritableStreamDefaultWriterAbort(writer, reason) {
+    var stream = writer._ownerWritableStream;
+    return WritableStreamAbort(stream, reason);
+}
+function WritableStreamDefaultWriterClose(writer) {
+    var stream = writer._ownerWritableStream;
+    return WritableStreamClose(stream);
+}
+function WritableStreamDefaultWriterCloseWithErrorPropagation(writer) {
+    var stream = writer._ownerWritableStream;
+    var state = stream._state;
+    if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {
+        return promiseResolvedWith(undefined);
+    }
+    if (state === 'errored') {
+        return promiseRejectedWith(stream._storedError);
+    }
+    return WritableStreamDefaultWriterClose(writer);
+}
+function WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, error) {
+    if (writer._closedPromiseState === 'pending') {
+        defaultWriterClosedPromiseReject(writer, error);
+    }
+    else {
+        defaultWriterClosedPromiseResetToRejected(writer, error);
+    }
+}
+function WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, error) {
+    if (writer._readyPromiseState === 'pending') {
+        defaultWriterReadyPromiseReject(writer, error);
+    }
+    else {
+        defaultWriterReadyPromiseResetToRejected(writer, error);
+    }
+}
+function WritableStreamDefaultWriterGetDesiredSize(writer) {
+    var stream = writer._ownerWritableStream;
+    var state = stream._state;
+    if (state === 'errored' || state === 'erroring') {
+        return null;
+    }
+    if (state === 'closed') {
+        return 0;
+    }
+    return WritableStreamDefaultControllerGetDesiredSize(stream._writableStreamController);
+}
+function WritableStreamDefaultWriterRelease(writer) {
+    var stream = writer._ownerWritableStream;
+    var releasedError = new TypeError("Writer was released and can no longer be used to monitor the stream's closedness");
+    WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, releasedError);
+    // The state transitions to "errored" before the sink abort() method runs, but the writer.closed promise is not
+    // rejected until afterwards. This means that simply testing state will not work.
+    WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, releasedError);
+    stream._writer = undefined;
+    writer._ownerWritableStream = undefined;
+}
+function WritableStreamDefaultWriterWrite(writer, chunk) {
+    var stream = writer._ownerWritableStream;
+    var controller = stream._writableStreamController;
+    var chunkSize = WritableStreamDefaultControllerGetChunkSize(controller, chunk);
+    if (stream !== writer._ownerWritableStream) {
+        return promiseRejectedWith(defaultWriterLockException('write to'));
+    }
+    var state = stream._state;
+    if (state === 'errored') {
+        return promiseRejectedWith(stream._storedError);
+    }
+    if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {
+        return promiseRejectedWith(new TypeError('The stream is closing or closed and cannot be written to'));
+    }
+    if (state === 'erroring') {
+        return promiseRejectedWith(stream._storedError);
+    }
+    var promise = WritableStreamAddWriteRequest(stream);
+    WritableStreamDefaultControllerWrite(controller, chunk, chunkSize);
+    return promise;
+}
+var closeSentinel = {};
+/**
+ * Allows control of a {@link WritableStream | writable stream}'s state and internal queue.
+ *
+ * @public
+ */
+var WritableStreamDefaultController = /** @class */ (function () {
+    function WritableStreamDefaultController() {
+        throw new TypeError('Illegal constructor');
+    }
+    Object.defineProperty(WritableStreamDefaultController.prototype, "abortReason", {
+        /**
+         * The reason which was passed to `WritableStream.abort(reason)` when the stream was aborted.
+         *
+         * @deprecated
+         *  This property has been removed from the specification, see https://github.com/whatwg/streams/pull/1177.
+         *  Use {@link WritableStreamDefaultController.signal}'s `reason` instead.
+         */
+        get: function () {
+            if (!IsWritableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$2('abortReason');
+            }
+            return this._abortReason;
+        },
+        enumerable: false,
+        configurable: true
+    });
+    Object.defineProperty(WritableStreamDefaultController.prototype, "signal", {
+        /**
+         * An `AbortSignal` that can be used to abort the pending write or close operation when the stream is aborted.
+         */
+        get: function () {
+            if (!IsWritableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$2('signal');
+            }
+            if (this._abortController === undefined) {
+                // Older browsers or older Node versions may not support `AbortController` or `AbortSignal`.
+                // We don't want to bundle and ship an `AbortController` polyfill together with our polyfill,
+                // so instead we only implement support for `signal` if we find a global `AbortController` constructor.
+                throw new TypeError('WritableStreamDefaultController.prototype.signal is not supported');
+            }
+            return this._abortController.signal;
+        },
+        enumerable: false,
+        configurable: true
+    });
+    /**
+     * Closes the controlled writable stream, making all future interactions with it fail with the given error `e`.
+     *
+     * This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying
+     * sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the
+     * normal lifecycle of interactions with the underlying sink.
+     */
+    WritableStreamDefaultController.prototype.error = function (e) {
+        if (e === void 0) { e = undefined; }
+        if (!IsWritableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$2('error');
+        }
+        var state = this._controlledWritableStream._state;
+        if (state !== 'writable') {
+            // The stream is closed, errored or will be soon. The sink can't do anything useful if it gets an error here, so
+            // just treat it as a no-op.
+            return;
+        }
+        WritableStreamDefaultControllerError(this, e);
+    };
+    /** @internal */
+    WritableStreamDefaultController.prototype[AbortSteps] = function (reason) {
+        var result = this._abortAlgorithm(reason);
+        WritableStreamDefaultControllerClearAlgorithms(this);
+        return result;
+    };
+    /** @internal */
+    WritableStreamDefaultController.prototype[ErrorSteps] = function () {
+        ResetQueue(this);
+    };
+    return WritableStreamDefaultController;
+}());
+Object.defineProperties(WritableStreamDefaultController.prototype, {
+    abortReason: { enumerable: true },
+    signal: { enumerable: true },
+    error: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(WritableStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+        value: 'WritableStreamDefaultController',
+        configurable: true
+    });
+}
+// Abstract operations implementing interface required by the WritableStream.
+function IsWritableStreamDefaultController(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_controlledWritableStream')) {
+        return false;
+    }
+    return x instanceof WritableStreamDefaultController;
+}
+function SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm) {
+    controller._controlledWritableStream = stream;
+    stream._writableStreamController = controller;
+    // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.
+    controller._queue = undefined;
+    controller._queueTotalSize = undefined;
+    ResetQueue(controller);
+    controller._abortReason = undefined;
+    controller._abortController = createAbortController();
+    controller._started = false;
+    controller._strategySizeAlgorithm = sizeAlgorithm;
+    controller._strategyHWM = highWaterMark;
+    controller._writeAlgorithm = writeAlgorithm;
+    controller._closeAlgorithm = closeAlgorithm;
+    controller._abortAlgorithm = abortAlgorithm;
+    var backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+    WritableStreamUpdateBackpressure(stream, backpressure);
+    var startResult = startAlgorithm();
+    var startPromise = promiseResolvedWith(startResult);
+    uponPromise(startPromise, function () {
+        controller._started = true;
+        WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+    }, function (r) {
+        controller._started = true;
+        WritableStreamDealWithRejection(stream, r);
+    });
+}
+function SetUpWritableStreamDefaultControllerFromUnderlyingSink(stream, underlyingSink, highWaterMark, sizeAlgorithm) {
+    var controller = Object.create(WritableStreamDefaultController.prototype);
+    var startAlgorithm = function () { return undefined; };
+    var writeAlgorithm = function () { return promiseResolvedWith(undefined); };
+    var closeAlgorithm = function () { return promiseResolvedWith(undefined); };
+    var abortAlgorithm = function () { return promiseResolvedWith(undefined); };
+    if (underlyingSink.start !== undefined) {
+        startAlgorithm = function () { return underlyingSink.start(controller); };
+    }
+    if (underlyingSink.write !== undefined) {
+        writeAlgorithm = function (chunk) { return underlyingSink.write(chunk, controller); };
+    }
+    if (underlyingSink.close !== undefined) {
+        closeAlgorithm = function () { return underlyingSink.close(); };
+    }
+    if (underlyingSink.abort !== undefined) {
+        abortAlgorithm = function (reason) { return underlyingSink.abort(reason); };
+    }
+    SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm);
+}
+// ClearAlgorithms may be called twice. Erroring the same stream in multiple ways will often result in redundant calls.
+function WritableStreamDefaultControllerClearAlgorithms(controller) {
+    controller._writeAlgorithm = undefined;
+    controller._closeAlgorithm = undefined;
+    controller._abortAlgorithm = undefined;
+    controller._strategySizeAlgorithm = undefined;
+}
+function WritableStreamDefaultControllerClose(controller) {
+    EnqueueValueWithSize(controller, closeSentinel, 0);
+    WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+}
+function WritableStreamDefaultControllerGetChunkSize(controller, chunk) {
+    try {
+        return controller._strategySizeAlgorithm(chunk);
+    }
+    catch (chunkSizeE) {
+        WritableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE);
+        return 1;
+    }
+}
+function WritableStreamDefaultControllerGetDesiredSize(controller) {
+    return controller._strategyHWM - controller._queueTotalSize;
+}
+function WritableStreamDefaultControllerWrite(controller, chunk, chunkSize) {
+    try {
+        EnqueueValueWithSize(controller, chunk, chunkSize);
+    }
+    catch (enqueueE) {
+        WritableStreamDefaultControllerErrorIfNeeded(controller, enqueueE);
+        return;
+    }
+    var stream = controller._controlledWritableStream;
+    if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._state === 'writable') {
+        var backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+        WritableStreamUpdateBackpressure(stream, backpressure);
+    }
+    WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+}
+// Abstract operations for the WritableStreamDefaultController.
+function WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller) {
+    var stream = controller._controlledWritableStream;
+    if (!controller._started) {
+        return;
+    }
+    if (stream._inFlightWriteRequest !== undefined) {
+        return;
+    }
+    var state = stream._state;
+    if (state === 'erroring') {
+        WritableStreamFinishErroring(stream);
+        return;
+    }
+    if (controller._queue.length === 0) {
+        return;
+    }
+    var value = PeekQueueValue(controller);
+    if (value === closeSentinel) {
+        WritableStreamDefaultControllerProcessClose(controller);
+    }
+    else {
+        WritableStreamDefaultControllerProcessWrite(controller, value);
+    }
+}
+function WritableStreamDefaultControllerErrorIfNeeded(controller, error) {
+    if (controller._controlledWritableStream._state === 'writable') {
+        WritableStreamDefaultControllerError(controller, error);
+    }
+}
+function WritableStreamDefaultControllerProcessClose(controller) {
+    var stream = controller._controlledWritableStream;
+    WritableStreamMarkCloseRequestInFlight(stream);
+    DequeueValue(controller);
+    var sinkClosePromise = controller._closeAlgorithm();
+    WritableStreamDefaultControllerClearAlgorithms(controller);
+    uponPromise(sinkClosePromise, function () {
+        WritableStreamFinishInFlightClose(stream);
+    }, function (reason) {
+        WritableStreamFinishInFlightCloseWithError(stream, reason);
+    });
+}
+function WritableStreamDefaultControllerProcessWrite(controller, chunk) {
+    var stream = controller._controlledWritableStream;
+    WritableStreamMarkFirstWriteRequestInFlight(stream);
+    var sinkWritePromise = controller._writeAlgorithm(chunk);
+    uponPromise(sinkWritePromise, function () {
+        WritableStreamFinishInFlightWrite(stream);
+        var state = stream._state;
+        DequeueValue(controller);
+        if (!WritableStreamCloseQueuedOrInFlight(stream) && state === 'writable') {
+            var backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+            WritableStreamUpdateBackpressure(stream, backpressure);
+        }
+        WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+    }, function (reason) {
+        if (stream._state === 'writable') {
+            WritableStreamDefaultControllerClearAlgorithms(controller);
+        }
+        WritableStreamFinishInFlightWriteWithError(stream, reason);
+    });
+}
+function WritableStreamDefaultControllerGetBackpressure(controller) {
+    var desiredSize = WritableStreamDefaultControllerGetDesiredSize(controller);
+    return desiredSize <= 0;
+}
+// A client of WritableStreamDefaultController may use these functions directly to bypass state check.
+function WritableStreamDefaultControllerError(controller, error) {
+    var stream = controller._controlledWritableStream;
+    WritableStreamDefaultControllerClearAlgorithms(controller);
+    WritableStreamStartErroring(stream, error);
+}
+// Helper functions for the WritableStream.
+function streamBrandCheckException$2(name) {
+    return new TypeError("WritableStream.prototype." + name + " can only be used on a WritableStream");
+}
+// Helper functions for the WritableStreamDefaultController.
+function defaultControllerBrandCheckException$2(name) {
+    return new TypeError("WritableStreamDefaultController.prototype." + name + " can only be used on a WritableStreamDefaultController");
+}
+// Helper functions for the WritableStreamDefaultWriter.
+function defaultWriterBrandCheckException(name) {
+    return new TypeError("WritableStreamDefaultWriter.prototype." + name + " can only be used on a WritableStreamDefaultWriter");
+}
+function defaultWriterLockException(name) {
+    return new TypeError('Cannot ' + name + ' a stream using a released writer');
+}
+function defaultWriterClosedPromiseInitialize(writer) {
+    writer._closedPromise = newPromise(function (resolve, reject) {
+        writer._closedPromise_resolve = resolve;
+        writer._closedPromise_reject = reject;
+        writer._closedPromiseState = 'pending';
+    });
+}
+function defaultWriterClosedPromiseInitializeAsRejected(writer, reason) {
+    defaultWriterClosedPromiseInitialize(writer);
+    defaultWriterClosedPromiseReject(writer, reason);
+}
+function defaultWriterClosedPromiseInitializeAsResolved(writer) {
+    defaultWriterClosedPromiseInitialize(writer);
+    defaultWriterClosedPromiseResolve(writer);
+}
+function defaultWriterClosedPromiseReject(writer, reason) {
+    if (writer._closedPromise_reject === undefined) {
+        return;
+    }
+    setPromiseIsHandledToTrue(writer._closedPromise);
+    writer._closedPromise_reject(reason);
+    writer._closedPromise_resolve = undefined;
+    writer._closedPromise_reject = undefined;
+    writer._closedPromiseState = 'rejected';
+}
+function defaultWriterClosedPromiseResetToRejected(writer, reason) {
+    defaultWriterClosedPromiseInitializeAsRejected(writer, reason);
+}
+function defaultWriterClosedPromiseResolve(writer) {
+    if (writer._closedPromise_resolve === undefined) {
+        return;
+    }
+    writer._closedPromise_resolve(undefined);
+    writer._closedPromise_resolve = undefined;
+    writer._closedPromise_reject = undefined;
+    writer._closedPromiseState = 'resolved';
+}
+function defaultWriterReadyPromiseInitialize(writer) {
+    writer._readyPromise = newPromise(function (resolve, reject) {
+        writer._readyPromise_resolve = resolve;
+        writer._readyPromise_reject = reject;
+    });
+    writer._readyPromiseState = 'pending';
+}
+function defaultWriterReadyPromiseInitializeAsRejected(writer, reason) {
+    defaultWriterReadyPromiseInitialize(writer);
+    defaultWriterReadyPromiseReject(writer, reason);
+}
+function defaultWriterReadyPromiseInitializeAsResolved(writer) {
+    defaultWriterReadyPromiseInitialize(writer);
+    defaultWriterReadyPromiseResolve(writer);
+}
+function defaultWriterReadyPromiseReject(writer, reason) {
+    if (writer._readyPromise_reject === undefined) {
+        return;
+    }
+    setPromiseIsHandledToTrue(writer._readyPromise);
+    writer._readyPromise_reject(reason);
+    writer._readyPromise_resolve = undefined;
+    writer._readyPromise_reject = undefined;
+    writer._readyPromiseState = 'rejected';
+}
+function defaultWriterReadyPromiseReset(writer) {
+    defaultWriterReadyPromiseInitialize(writer);
+}
+function defaultWriterReadyPromiseResetToRejected(writer, reason) {
+    defaultWriterReadyPromiseInitializeAsRejected(writer, reason);
+}
+function defaultWriterReadyPromiseResolve(writer) {
+    if (writer._readyPromise_resolve === undefined) {
+        return;
+    }
+    writer._readyPromise_resolve(undefined);
+    writer._readyPromise_resolve = undefined;
+    writer._readyPromise_reject = undefined;
+    writer._readyPromiseState = 'fulfilled';
+}
+
+/// <reference lib="dom" />
+var NativeDOMException = typeof DOMException !== 'undefined' ? DOMException : undefined;
+
+/// <reference types="node" />
+function isDOMExceptionConstructor(ctor) {
+    if (!(typeof ctor === 'function' || typeof ctor === 'object')) {
+        return false;
+    }
+    try {
+        new ctor();
+        return true;
+    }
+    catch (_a) {
+        return false;
+    }
+}
+function createDOMExceptionPolyfill() {
+    // eslint-disable-next-line no-shadow
+    var ctor = function DOMException(message, name) {
+        this.message = message || '';
+        this.name = name || 'Error';
+        if (Error.captureStackTrace) {
+            Error.captureStackTrace(this, this.constructor);
+        }
+    };
+    ctor.prototype = Object.create(Error.prototype);
+    Object.defineProperty(ctor.prototype, 'constructor', { value: ctor, writable: true, configurable: true });
+    return ctor;
+}
+// eslint-disable-next-line no-redeclare
+var DOMException$1 = isDOMExceptionConstructor(NativeDOMException) ? NativeDOMException : createDOMExceptionPolyfill();
+
+function ReadableStreamPipeTo(source, dest, preventClose, preventAbort, preventCancel, signal) {
+    var reader = AcquireReadableStreamDefaultReader(source);
+    var writer = AcquireWritableStreamDefaultWriter(dest);
+    source._disturbed = true;
+    var shuttingDown = false;
+    // This is used to keep track of the spec's requirement that we wait for ongoing writes during shutdown.
+    var currentWrite = promiseResolvedWith(undefined);
+    return newPromise(function (resolve, reject) {
+        var abortAlgorithm;
+        if (signal !== undefined) {
+            abortAlgorithm = function () {
+                var error = new DOMException$1('Aborted', 'AbortError');
+                var actions = [];
+                if (!preventAbort) {
+                    actions.push(function () {
+                        if (dest._state === 'writable') {
+                            return WritableStreamAbort(dest, error);
+                        }
+                        return promiseResolvedWith(undefined);
+                    });
+                }
+                if (!preventCancel) {
+                    actions.push(function () {
+                        if (source._state === 'readable') {
+                            return ReadableStreamCancel(source, error);
+                        }
+                        return promiseResolvedWith(undefined);
+                    });
+                }
+                shutdownWithAction(function () { return Promise.all(actions.map(function (action) { return action(); })); }, true, error);
+            };
+            if (signal.aborted) {
+                abortAlgorithm();
+                return;
+            }
+            signal.addEventListener('abort', abortAlgorithm);
+        }
+        // Using reader and writer, read all chunks from this and write them to dest
+        // - Backpressure must be enforced
+        // - Shutdown must stop all activity
+        function pipeLoop() {
+            return newPromise(function (resolveLoop, rejectLoop) {
+                function next(done) {
+                    if (done) {
+                        resolveLoop();
+                    }
+                    else {
+                        // Use `PerformPromiseThen` instead of `uponPromise` to avoid
+                        // adding unnecessary `.catch(rethrowAssertionErrorRejection)` handlers
+                        PerformPromiseThen(pipeStep(), next, rejectLoop);
+                    }
+                }
+                next(false);
+            });
+        }
+        function pipeStep() {
+            if (shuttingDown) {
+                return promiseResolvedWith(true);
+            }
+            return PerformPromiseThen(writer._readyPromise, function () {
+                return newPromise(function (resolveRead, rejectRead) {
+                    ReadableStreamDefaultReaderRead(reader, {
+                        _chunkSteps: function (chunk) {
+                            currentWrite = PerformPromiseThen(WritableStreamDefaultWriterWrite(writer, chunk), undefined, noop);
+                            resolveRead(false);
+                        },
+                        _closeSteps: function () { return resolveRead(true); },
+                        _errorSteps: rejectRead
+                    });
+                });
+            });
+        }
+        // Errors must be propagated forward
+        isOrBecomesErrored(source, reader._closedPromise, function (storedError) {
+            if (!preventAbort) {
+                shutdownWithAction(function () { return WritableStreamAbort(dest, storedError); }, true, storedError);
+            }
+            else {
+                shutdown(true, storedError);
+            }
+        });
+        // Errors must be propagated backward
+        isOrBecomesErrored(dest, writer._closedPromise, function (storedError) {
+            if (!preventCancel) {
+                shutdownWithAction(function () { return ReadableStreamCancel(source, storedError); }, true, storedError);
+            }
+            else {
+                shutdown(true, storedError);
+            }
+        });
+        // Closing must be propagated forward
+        isOrBecomesClosed(source, reader._closedPromise, function () {
+            if (!preventClose) {
+                shutdownWithAction(function () { return WritableStreamDefaultWriterCloseWithErrorPropagation(writer); });
+            }
+            else {
+                shutdown();
+            }
+        });
+        // Closing must be propagated backward
+        if (WritableStreamCloseQueuedOrInFlight(dest) || dest._state === 'closed') {
+            var destClosed_1 = new TypeError('the destination writable stream closed before all data could be piped to it');
+            if (!preventCancel) {
+                shutdownWithAction(function () { return ReadableStreamCancel(source, destClosed_1); }, true, destClosed_1);
+            }
+            else {
+                shutdown(true, destClosed_1);
+            }
+        }
+        setPromiseIsHandledToTrue(pipeLoop());
+        function waitForWritesToFinish() {
+            // Another write may have started while we were waiting on this currentWrite, so we have to be sure to wait
+            // for that too.
+            var oldCurrentWrite = currentWrite;
+            return PerformPromiseThen(currentWrite, function () { return oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined; });
+        }
+        function isOrBecomesErrored(stream, promise, action) {
+            if (stream._state === 'errored') {
+                action(stream._storedError);
+            }
+            else {
+                uponRejection(promise, action);
+            }
+        }
+        function isOrBecomesClosed(stream, promise, action) {
+            if (stream._state === 'closed') {
+                action();
+            }
+            else {
+                uponFulfillment(promise, action);
+            }
+        }
+        function shutdownWithAction(action, originalIsError, originalError) {
+            if (shuttingDown) {
+                return;
+            }
+            shuttingDown = true;
+            if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {
+                uponFulfillment(waitForWritesToFinish(), doTheRest);
+            }
+            else {
+                doTheRest();
+            }
+            function doTheRest() {
+                uponPromise(action(), function () { return finalize(originalIsError, originalError); }, function (newError) { return finalize(true, newError); });
+            }
+        }
+        function shutdown(isError, error) {
+            if (shuttingDown) {
+                return;
+            }
+            shuttingDown = true;
+            if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {
+                uponFulfillment(waitForWritesToFinish(), function () { return finalize(isError, error); });
+            }
+            else {
+                finalize(isError, error);
+            }
+        }
+        function finalize(isError, error) {
+            WritableStreamDefaultWriterRelease(writer);
+            ReadableStreamReaderGenericRelease(reader);
+            if (signal !== undefined) {
+                signal.removeEventListener('abort', abortAlgorithm);
+            }
+            if (isError) {
+                reject(error);
+            }
+            else {
+                resolve(undefined);
+            }
+        }
+    });
+}
+
+/**
+ * Allows control of a {@link ReadableStream | readable stream}'s state and internal queue.
+ *
+ * @public
+ */
+var ReadableStreamDefaultController = /** @class */ (function () {
+    function ReadableStreamDefaultController() {
+        throw new TypeError('Illegal constructor');
+    }
+    Object.defineProperty(ReadableStreamDefaultController.prototype, "desiredSize", {
+        /**
+         * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is
+         * over-full. An underlying source ought to use this information to determine when and how to apply backpressure.
+         */
+        get: function () {
+            if (!IsReadableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$1('desiredSize');
+            }
+            return ReadableStreamDefaultControllerGetDesiredSize(this);
+        },
+        enumerable: false,
+        configurable: true
+    });
+    /**
+     * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from
+     * the stream, but once those are read, the stream will become closed.
+     */
+    ReadableStreamDefaultController.prototype.close = function () {
+        if (!IsReadableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$1('close');
+        }
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {
+            throw new TypeError('The stream is not in a state that permits close');
+        }
+        ReadableStreamDefaultControllerClose(this);
+    };
+    ReadableStreamDefaultController.prototype.enqueue = function (chunk) {
+        if (chunk === void 0) { chunk = undefined; }
+        if (!IsReadableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$1('enqueue');
+        }
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {
+            throw new TypeError('The stream is not in a state that permits enqueue');
+        }
+        return ReadableStreamDefaultControllerEnqueue(this, chunk);
+    };
+    /**
+     * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.
+     */
+    ReadableStreamDefaultController.prototype.error = function (e) {
+        if (e === void 0) { e = undefined; }
+        if (!IsReadableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$1('error');
+        }
+        ReadableStreamDefaultControllerError(this, e);
+    };
+    /** @internal */
+    ReadableStreamDefaultController.prototype[CancelSteps] = function (reason) {
+        ResetQueue(this);
+        var result = this._cancelAlgorithm(reason);
+        ReadableStreamDefaultControllerClearAlgorithms(this);
+        return result;
+    };
+    /** @internal */
+    ReadableStreamDefaultController.prototype[PullSteps] = function (readRequest) {
+        var stream = this._controlledReadableStream;
+        if (this._queue.length > 0) {
+            var chunk = DequeueValue(this);
+            if (this._closeRequested && this._queue.length === 0) {
+                ReadableStreamDefaultControllerClearAlgorithms(this);
+                ReadableStreamClose(stream);
+            }
+            else {
+                ReadableStreamDefaultControllerCallPullIfNeeded(this);
+            }
+            readRequest._chunkSteps(chunk);
+        }
+        else {
+            ReadableStreamAddReadRequest(stream, readRequest);
+            ReadableStreamDefaultControllerCallPullIfNeeded(this);
+        }
+    };
+    return ReadableStreamDefaultController;
+}());
+Object.defineProperties(ReadableStreamDefaultController.prototype, {
+    close: { enumerable: true },
+    enqueue: { enumerable: true },
+    error: { enumerable: true },
+    desiredSize: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableStreamDefaultController',
+        configurable: true
+    });
+}
+// Abstract operations for the ReadableStreamDefaultController.
+function IsReadableStreamDefaultController(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableStream')) {
+        return false;
+    }
+    return x instanceof ReadableStreamDefaultController;
+}
+function ReadableStreamDefaultControllerCallPullIfNeeded(controller) {
+    var shouldPull = ReadableStreamDefaultControllerShouldCallPull(controller);
+    if (!shouldPull) {
+        return;
+    }
+    if (controller._pulling) {
+        controller._pullAgain = true;
+        return;
+    }
+    controller._pulling = true;
+    var pullPromise = controller._pullAlgorithm();
+    uponPromise(pullPromise, function () {
+        controller._pulling = false;
+        if (controller._pullAgain) {
+            controller._pullAgain = false;
+            ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+        }
+    }, function (e) {
+        ReadableStreamDefaultControllerError(controller, e);
+    });
+}
+function ReadableStreamDefaultControllerShouldCallPull(controller) {
+    var stream = controller._controlledReadableStream;
+    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+        return false;
+    }
+    if (!controller._started) {
+        return false;
+    }
+    if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+        return true;
+    }
+    var desiredSize = ReadableStreamDefaultControllerGetDesiredSize(controller);
+    if (desiredSize > 0) {
+        return true;
+    }
+    return false;
+}
+function ReadableStreamDefaultControllerClearAlgorithms(controller) {
+    controller._pullAlgorithm = undefined;
+    controller._cancelAlgorithm = undefined;
+    controller._strategySizeAlgorithm = undefined;
+}
+// A client of ReadableStreamDefaultController may use these functions directly to bypass state check.
+function ReadableStreamDefaultControllerClose(controller) {
+    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+        return;
+    }
+    var stream = controller._controlledReadableStream;
+    controller._closeRequested = true;
+    if (controller._queue.length === 0) {
+        ReadableStreamDefaultControllerClearAlgorithms(controller);
+        ReadableStreamClose(stream);
+    }
+}
+function ReadableStreamDefaultControllerEnqueue(controller, chunk) {
+    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+        return;
+    }
+    var stream = controller._controlledReadableStream;
+    if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+        ReadableStreamFulfillReadRequest(stream, chunk, false);
+    }
+    else {
+        var chunkSize = void 0;
+        try {
+            chunkSize = controller._strategySizeAlgorithm(chunk);
+        }
+        catch (chunkSizeE) {
+            ReadableStreamDefaultControllerError(controller, chunkSizeE);
+            throw chunkSizeE;
+        }
+        try {
+            EnqueueValueWithSize(controller, chunk, chunkSize);
+        }
+        catch (enqueueE) {
+            ReadableStreamDefaultControllerError(controller, enqueueE);
+            throw enqueueE;
+        }
+    }
+    ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+}
+function ReadableStreamDefaultControllerError(controller, e) {
+    var stream = controller._controlledReadableStream;
+    if (stream._state !== 'readable') {
+        return;
+    }
+    ResetQueue(controller);
+    ReadableStreamDefaultControllerClearAlgorithms(controller);
+    ReadableStreamError(stream, e);
+}
+function ReadableStreamDefaultControllerGetDesiredSize(controller) {
+    var state = controller._controlledReadableStream._state;
+    if (state === 'errored') {
+        return null;
+    }
+    if (state === 'closed') {
+        return 0;
+    }
+    return controller._strategyHWM - controller._queueTotalSize;
+}
+// This is used in the implementation of TransformStream.
+function ReadableStreamDefaultControllerHasBackpressure(controller) {
+    if (ReadableStreamDefaultControllerShouldCallPull(controller)) {
+        return false;
+    }
+    return true;
+}
+function ReadableStreamDefaultControllerCanCloseOrEnqueue(controller) {
+    var state = controller._controlledReadableStream._state;
+    if (!controller._closeRequested && state === 'readable') {
+        return true;
+    }
+    return false;
+}
+function SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm) {
+    controller._controlledReadableStream = stream;
+    controller._queue = undefined;
+    controller._queueTotalSize = undefined;
+    ResetQueue(controller);
+    controller._started = false;
+    controller._closeRequested = false;
+    controller._pullAgain = false;
+    controller._pulling = false;
+    controller._strategySizeAlgorithm = sizeAlgorithm;
+    controller._strategyHWM = highWaterMark;
+    controller._pullAlgorithm = pullAlgorithm;
+    controller._cancelAlgorithm = cancelAlgorithm;
+    stream._readableStreamController = controller;
+    var startResult = startAlgorithm();
+    uponPromise(promiseResolvedWith(startResult), function () {
+        controller._started = true;
+        ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+    }, function (r) {
+        ReadableStreamDefaultControllerError(controller, r);
+    });
+}
+function SetUpReadableStreamDefaultControllerFromUnderlyingSource(stream, underlyingSource, highWaterMark, sizeAlgorithm) {
+    var controller = Object.create(ReadableStreamDefaultController.prototype);
+    var startAlgorithm = function () { return undefined; };
+    var pullAlgorithm = function () { return promiseResolvedWith(undefined); };
+    var cancelAlgorithm = function () { return promiseResolvedWith(undefined); };
+    if (underlyingSource.start !== undefined) {
+        startAlgorithm = function () { return underlyingSource.start(controller); };
+    }
+    if (underlyingSource.pull !== undefined) {
+        pullAlgorithm = function () { return underlyingSource.pull(controller); };
+    }
+    if (underlyingSource.cancel !== undefined) {
+        cancelAlgorithm = function (reason) { return underlyingSource.cancel(reason); };
+    }
+    SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm);
+}
+// Helper functions for the ReadableStreamDefaultController.
+function defaultControllerBrandCheckException$1(name) {
+    return new TypeError("ReadableStreamDefaultController.prototype." + name + " can only be used on a ReadableStreamDefaultController");
+}
+
+function ReadableStreamTee(stream, cloneForBranch2) {
+    if (IsReadableByteStreamController(stream._readableStreamController)) {
+        return ReadableByteStreamTee(stream);
+    }
+    return ReadableStreamDefaultTee(stream);
+}
+function ReadableStreamDefaultTee(stream, cloneForBranch2) {
+    var reader = AcquireReadableStreamDefaultReader(stream);
+    var reading = false;
+    var readAgain = false;
+    var canceled1 = false;
+    var canceled2 = false;
+    var reason1;
+    var reason2;
+    var branch1;
+    var branch2;
+    var resolveCancelPromise;
+    var cancelPromise = newPromise(function (resolve) {
+        resolveCancelPromise = resolve;
+    });
+    function pullAlgorithm() {
+        if (reading) {
+            readAgain = true;
+            return promiseResolvedWith(undefined);
+        }
+        reading = true;
+        var readRequest = {
+            _chunkSteps: function (chunk) {
+                // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                // successful synchronously-available reads get ahead of asynchronously-available errors.
+                queueMicrotask(function () {
+                    readAgain = false;
+                    var chunk1 = chunk;
+                    var chunk2 = chunk;
+                    // There is no way to access the cloning code right now in the reference implementation.
+                    // If we add one then we'll need an implementation for serializable objects.
+                    // if (!canceled2 && cloneForBranch2) {
+                    //   chunk2 = StructuredDeserialize(StructuredSerialize(chunk2));
+                    // }
+                    if (!canceled1) {
+                        ReadableStreamDefaultControllerEnqueue(branch1._readableStreamController, chunk1);
+                    }
+                    if (!canceled2) {
+                        ReadableStreamDefaultControllerEnqueue(branch2._readableStreamController, chunk2);
+                    }
+                    reading = false;
+                    if (readAgain) {
+                        pullAlgorithm();
+                    }
+                });
+            },
+            _closeSteps: function () {
+                reading = false;
+                if (!canceled1) {
+                    ReadableStreamDefaultControllerClose(branch1._readableStreamController);
+                }
+                if (!canceled2) {
+                    ReadableStreamDefaultControllerClose(branch2._readableStreamController);
+                }
+                if (!canceled1 || !canceled2) {
+                    resolveCancelPromise(undefined);
+                }
+            },
+            _errorSteps: function () {
+                reading = false;
+            }
+        };
+        ReadableStreamDefaultReaderRead(reader, readRequest);
+        return promiseResolvedWith(undefined);
+    }
+    function cancel1Algorithm(reason) {
+        canceled1 = true;
+        reason1 = reason;
+        if (canceled2) {
+            var compositeReason = CreateArrayFromList([reason1, reason2]);
+            var cancelResult = ReadableStreamCancel(stream, compositeReason);
+            resolveCancelPromise(cancelResult);
+        }
+        return cancelPromise;
+    }
+    function cancel2Algorithm(reason) {
+        canceled2 = true;
+        reason2 = reason;
+        if (canceled1) {
+            var compositeReason = CreateArrayFromList([reason1, reason2]);
+            var cancelResult = ReadableStreamCancel(stream, compositeReason);
+            resolveCancelPromise(cancelResult);
+        }
+        return cancelPromise;
+    }
+    function startAlgorithm() {
+        // do nothing
+    }
+    branch1 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel1Algorithm);
+    branch2 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel2Algorithm);
+    uponRejection(reader._closedPromise, function (r) {
+        ReadableStreamDefaultControllerError(branch1._readableStreamController, r);
+        ReadableStreamDefaultControllerError(branch2._readableStreamController, r);
+        if (!canceled1 || !canceled2) {
+            resolveCancelPromise(undefined);
+        }
+    });
+    return [branch1, branch2];
+}
+function ReadableByteStreamTee(stream) {
+    var reader = AcquireReadableStreamDefaultReader(stream);
+    var reading = false;
+    var readAgainForBranch1 = false;
+    var readAgainForBranch2 = false;
+    var canceled1 = false;
+    var canceled2 = false;
+    var reason1;
+    var reason2;
+    var branch1;
+    var branch2;
+    var resolveCancelPromise;
+    var cancelPromise = newPromise(function (resolve) {
+        resolveCancelPromise = resolve;
+    });
+    function forwardReaderError(thisReader) {
+        uponRejection(thisReader._closedPromise, function (r) {
+            if (thisReader !== reader) {
+                return;
+            }
+            ReadableByteStreamControllerError(branch1._readableStreamController, r);
+            ReadableByteStreamControllerError(branch2._readableStreamController, r);
+            if (!canceled1 || !canceled2) {
+                resolveCancelPromise(undefined);
+            }
+        });
+    }
+    function pullWithDefaultReader() {
+        if (IsReadableStreamBYOBReader(reader)) {
+            ReadableStreamReaderGenericRelease(reader);
+            reader = AcquireReadableStreamDefaultReader(stream);
+            forwardReaderError(reader);
+        }
+        var readRequest = {
+            _chunkSteps: function (chunk) {
+                // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                // successful synchronously-available reads get ahead of asynchronously-available errors.
+                queueMicrotask(function () {
+                    readAgainForBranch1 = false;
+                    readAgainForBranch2 = false;
+                    var chunk1 = chunk;
+                    var chunk2 = chunk;
+                    if (!canceled1 && !canceled2) {
+                        try {
+                            chunk2 = CloneAsUint8Array(chunk);
+                        }
+                        catch (cloneE) {
+                            ReadableByteStreamControllerError(branch1._readableStreamController, cloneE);
+                            ReadableByteStreamControllerError(branch2._readableStreamController, cloneE);
+                            resolveCancelPromise(ReadableStreamCancel(stream, cloneE));
+                            return;
+                        }
+                    }
+                    if (!canceled1) {
+                        ReadableByteStreamControllerEnqueue(branch1._readableStreamController, chunk1);
+                    }
+                    if (!canceled2) {
+                        ReadableByteStreamControllerEnqueue(branch2._readableStreamController, chunk2);
+                    }
+                    reading = false;
+                    if (readAgainForBranch1) {
+                        pull1Algorithm();
+                    }
+                    else if (readAgainForBranch2) {
+                        pull2Algorithm();
+                    }
+                });
+            },
+            _closeSteps: function () {
+                reading = false;
+                if (!canceled1) {
+                    ReadableByteStreamControllerClose(branch1._readableStreamController);
+                }
+                if (!canceled2) {
+                    ReadableByteStreamControllerClose(branch2._readableStreamController);
+                }
+                if (branch1._readableStreamController._pendingPullIntos.length > 0) {
+                    ReadableByteStreamControllerRespond(branch1._readableStreamController, 0);
+                }
+                if (branch2._readableStreamController._pendingPullIntos.length > 0) {
+                    ReadableByteStreamControllerRespond(branch2._readableStreamController, 0);
+                }
+                if (!canceled1 || !canceled2) {
+                    resolveCancelPromise(undefined);
+                }
+            },
+            _errorSteps: function () {
+                reading = false;
+            }
+        };
+        ReadableStreamDefaultReaderRead(reader, readRequest);
+    }
+    function pullWithBYOBReader(view, forBranch2) {
+        if (IsReadableStreamDefaultReader(reader)) {
+            ReadableStreamReaderGenericRelease(reader);
+            reader = AcquireReadableStreamBYOBReader(stream);
+            forwardReaderError(reader);
+        }
+        var byobBranch = forBranch2 ? branch2 : branch1;
+        var otherBranch = forBranch2 ? branch1 : branch2;
+        var readIntoRequest = {
+            _chunkSteps: function (chunk) {
+                // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                // successful synchronously-available reads get ahead of asynchronously-available errors.
+                queueMicrotask(function () {
+                    readAgainForBranch1 = false;
+                    readAgainForBranch2 = false;
+                    var byobCanceled = forBranch2 ? canceled2 : canceled1;
+                    var otherCanceled = forBranch2 ? canceled1 : canceled2;
+                    if (!otherCanceled) {
+                        var clonedChunk = void 0;
+                        try {
+                            clonedChunk = CloneAsUint8Array(chunk);
+                        }
+                        catch (cloneE) {
+                            ReadableByteStreamControllerError(byobBranch._readableStreamController, cloneE);
+                            ReadableByteStreamControllerError(otherBranch._readableStreamController, cloneE);
+                            resolveCancelPromise(ReadableStreamCancel(stream, cloneE));
+                            return;
+                        }
+                        if (!byobCanceled) {
+                            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                        }
+                        ReadableByteStreamControllerEnqueue(otherBranch._readableStreamController, clonedChunk);
+                    }
+                    else if (!byobCanceled) {
+                        ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                    }
+                    reading = false;
+                    if (readAgainForBranch1) {
+                        pull1Algorithm();
+                    }
+                    else if (readAgainForBranch2) {
+                        pull2Algorithm();
+                    }
+                });
+            },
+            _closeSteps: function (chunk) {
+                reading = false;
+                var byobCanceled = forBranch2 ? canceled2 : canceled1;
+                var otherCanceled = forBranch2 ? canceled1 : canceled2;
+                if (!byobCanceled) {
+                    ReadableByteStreamControllerClose(byobBranch._readableStreamController);
+                }
+                if (!otherCanceled) {
+                    ReadableByteStreamControllerClose(otherBranch._readableStreamController);
+                }
+                if (chunk !== undefined) {
+                    if (!byobCanceled) {
+                        ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                    }
+                    if (!otherCanceled && otherBranch._readableStreamController._pendingPullIntos.length > 0) {
+                        ReadableByteStreamControllerRespond(otherBranch._readableStreamController, 0);
+                    }
+                }
+                if (!byobCanceled || !otherCanceled) {
+                    resolveCancelPromise(undefined);
+                }
+            },
+            _errorSteps: function () {
+                reading = false;
+            }
+        };
+        ReadableStreamBYOBReaderRead(reader, view, readIntoRequest);
+    }
+    function pull1Algorithm() {
+        if (reading) {
+            readAgainForBranch1 = true;
+            return promiseResolvedWith(undefined);
+        }
+        reading = true;
+        var byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch1._readableStreamController);
+        if (byobRequest === null) {
+            pullWithDefaultReader();
+        }
+        else {
+            pullWithBYOBReader(byobRequest._view, false);
+        }
+        return promiseResolvedWith(undefined);
+    }
+    function pull2Algorithm() {
+        if (reading) {
+            readAgainForBranch2 = true;
+            return promiseResolvedWith(undefined);
+        }
+        reading = true;
+        var byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch2._readableStreamController);
+        if (byobRequest === null) {
+            pullWithDefaultReader();
+        }
+        else {
+            pullWithBYOBReader(byobRequest._view, true);
+        }
+        return promiseResolvedWith(undefined);
+    }
+    function cancel1Algorithm(reason) {
+        canceled1 = true;
+        reason1 = reason;
+        if (canceled2) {
+            var compositeReason = CreateArrayFromList([reason1, reason2]);
+            var cancelResult = ReadableStreamCancel(stream, compositeReason);
+            resolveCancelPromise(cancelResult);
+        }
+        return cancelPromise;
+    }
+    function cancel2Algorithm(reason) {
+        canceled2 = true;
+        reason2 = reason;
+        if (canceled1) {
+            var compositeReason = CreateArrayFromList([reason1, reason2]);
+            var cancelResult = ReadableStreamCancel(stream, compositeReason);
+            resolveCancelPromise(cancelResult);
+        }
+        return cancelPromise;
+    }
+    function startAlgorithm() {
+        return;
+    }
+    branch1 = CreateReadableByteStream(startAlgorithm, pull1Algorithm, cancel1Algorithm);
+    branch2 = CreateReadableByteStream(startAlgorithm, pull2Algorithm, cancel2Algorithm);
+    forwardReaderError(reader);
+    return [branch1, branch2];
+}
+
+function convertUnderlyingDefaultOrByteSource(source, context) {
+    assertDictionary(source, context);
+    var original = source;
+    var autoAllocateChunkSize = original === null || original === void 0 ? void 0 : original.autoAllocateChunkSize;
+    var cancel = original === null || original === void 0 ? void 0 : original.cancel;
+    var pull = original === null || original === void 0 ? void 0 : original.pull;
+    var start = original === null || original === void 0 ? void 0 : original.start;
+    var type = original === null || original === void 0 ? void 0 : original.type;
+    return {
+        autoAllocateChunkSize: autoAllocateChunkSize === undefined ?
+            undefined :
+            convertUnsignedLongLongWithEnforceRange(autoAllocateChunkSize, context + " has member 'autoAllocateChunkSize' that"),
+        cancel: cancel === undefined ?
+            undefined :
+            convertUnderlyingSourceCancelCallback(cancel, original, context + " has member 'cancel' that"),
+        pull: pull === undefined ?
+            undefined :
+            convertUnderlyingSourcePullCallback(pull, original, context + " has member 'pull' that"),
+        start: start === undefined ?
+            undefined :
+            convertUnderlyingSourceStartCallback(start, original, context + " has member 'start' that"),
+        type: type === undefined ? undefined : convertReadableStreamType(type, context + " has member 'type' that")
+    };
+}
+function convertUnderlyingSourceCancelCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return function (reason) { return promiseCall(fn, original, [reason]); };
+}
+function convertUnderlyingSourcePullCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return function (controller) { return promiseCall(fn, original, [controller]); };
+}
+function convertUnderlyingSourceStartCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return function (controller) { return reflectCall(fn, original, [controller]); };
+}
+function convertReadableStreamType(type, context) {
+    type = "" + type;
+    if (type !== 'bytes') {
+        throw new TypeError(context + " '" + type + "' is not a valid enumeration value for ReadableStreamType");
+    }
+    return type;
+}
+
+function convertReaderOptions(options, context) {
+    assertDictionary(options, context);
+    var mode = options === null || options === void 0 ? void 0 : options.mode;
+    return {
+        mode: mode === undefined ? undefined : convertReadableStreamReaderMode(mode, context + " has member 'mode' that")
+    };
+}
+function convertReadableStreamReaderMode(mode, context) {
+    mode = "" + mode;
+    if (mode !== 'byob') {
+        throw new TypeError(context + " '" + mode + "' is not a valid enumeration value for ReadableStreamReaderMode");
+    }
+    return mode;
+}
+
+function convertIteratorOptions(options, context) {
+    assertDictionary(options, context);
+    var preventCancel = options === null || options === void 0 ? void 0 : options.preventCancel;
+    return { preventCancel: Boolean(preventCancel) };
+}
+
+function convertPipeOptions(options, context) {
+    assertDictionary(options, context);
+    var preventAbort = options === null || options === void 0 ? void 0 : options.preventAbort;
+    var preventCancel = options === null || options === void 0 ? void 0 : options.preventCancel;
+    var preventClose = options === null || options === void 0 ? void 0 : options.preventClose;
+    var signal = options === null || options === void 0 ? void 0 : options.signal;
+    if (signal !== undefined) {
+        assertAbortSignal(signal, context + " has member 'signal' that");
+    }
+    return {
+        preventAbort: Boolean(preventAbort),
+        preventCancel: Boolean(preventCancel),
+        preventClose: Boolean(preventClose),
+        signal: signal
+    };
+}
+function assertAbortSignal(signal, context) {
+    if (!isAbortSignal(signal)) {
+        throw new TypeError(context + " is not an AbortSignal.");
+    }
+}
+
+function convertReadableWritablePair(pair, context) {
+    assertDictionary(pair, context);
+    var readable = pair === null || pair === void 0 ? void 0 : pair.readable;
+    assertRequiredField(readable, 'readable', 'ReadableWritablePair');
+    assertReadableStream(readable, context + " has member 'readable' that");
+    var writable = pair === null || pair === void 0 ? void 0 : pair.writable;
+    assertRequiredField(writable, 'writable', 'ReadableWritablePair');
+    assertWritableStream(writable, context + " has member 'writable' that");
+    return { readable: readable, writable: writable };
+}
+
+/**
+ * A readable stream represents a source of data, from which you can read.
+ *
+ * @public
+ */
+var ReadableStream = /** @class */ (function () {
+    function ReadableStream(rawUnderlyingSource, rawStrategy) {
+        if (rawUnderlyingSource === void 0) { rawUnderlyingSource = {}; }
+        if (rawStrategy === void 0) { rawStrategy = {}; }
+        if (rawUnderlyingSource === undefined) {
+            rawUnderlyingSource = null;
+        }
+        else {
+            assertObject(rawUnderlyingSource, 'First parameter');
+        }
+        var strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');
+        var underlyingSource = convertUnderlyingDefaultOrByteSource(rawUnderlyingSource, 'First parameter');
+        InitializeReadableStream(this);
+        if (underlyingSource.type === 'bytes') {
+            if (strategy.size !== undefined) {
+                throw new RangeError('The strategy for a byte stream cannot have a size function');
+            }
+            var highWaterMark = ExtractHighWaterMark(strategy, 0);
+            SetUpReadableByteStreamControllerFromUnderlyingSource(this, underlyingSource, highWaterMark);
+        }
+        else {
+            var sizeAlgorithm = ExtractSizeAlgorithm(strategy);
+            var highWaterMark = ExtractHighWaterMark(strategy, 1);
+            SetUpReadableStreamDefaultControllerFromUnderlyingSource(this, underlyingSource, highWaterMark, sizeAlgorithm);
+        }
+    }
+    Object.defineProperty(ReadableStream.prototype, "locked", {
+        /**
+         * Whether or not the readable stream is locked to a {@link ReadableStreamDefaultReader | reader}.
+         */
+        get: function () {
+            if (!IsReadableStream(this)) {
+                throw streamBrandCheckException$1('locked');
+            }
+            return IsReadableStreamLocked(this);
+        },
+        enumerable: false,
+        configurable: true
+    });
+    /**
+     * Cancels the stream, signaling a loss of interest in the stream by a consumer.
+     *
+     * The supplied `reason` argument will be given to the underlying source's {@link UnderlyingSource.cancel | cancel()}
+     * method, which might or might not use it.
+     */
+    ReadableStream.prototype.cancel = function (reason) {
+        if (reason === void 0) { reason = undefined; }
+        if (!IsReadableStream(this)) {
+            return promiseRejectedWith(streamBrandCheckException$1('cancel'));
+        }
+        if (IsReadableStreamLocked(this)) {
+            return promiseRejectedWith(new TypeError('Cannot cancel a stream that already has a reader'));
+        }
+        return ReadableStreamCancel(this, reason);
+    };
+    ReadableStream.prototype.getReader = function (rawOptions) {
+        if (rawOptions === void 0) { rawOptions = undefined; }
+        if (!IsReadableStream(this)) {
+            throw streamBrandCheckException$1('getReader');
+        }
+        var options = convertReaderOptions(rawOptions, 'First parameter');
+        if (options.mode === undefined) {
+            return AcquireReadableStreamDefaultReader(this);
+        }
+        return AcquireReadableStreamBYOBReader(this);
+    };
+    ReadableStream.prototype.pipeThrough = function (rawTransform, rawOptions) {
+        if (rawOptions === void 0) { rawOptions = {}; }
+        if (!IsReadableStream(this)) {
+            throw streamBrandCheckException$1('pipeThrough');
+        }
+        assertRequiredArgument(rawTransform, 1, 'pipeThrough');
+        var transform = convertReadableWritablePair(rawTransform, 'First parameter');
+        var options = convertPipeOptions(rawOptions, 'Second parameter');
+        if (IsReadableStreamLocked(this)) {
+            throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked ReadableStream');
+        }
+        if (IsWritableStreamLocked(transform.writable)) {
+            throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked WritableStream');
+        }
+        var promise = ReadableStreamPipeTo(this, transform.writable, options.preventClose, options.preventAbort, options.preventCancel, options.signal);
+        setPromiseIsHandledToTrue(promise);
+        return transform.readable;
+    };
+    ReadableStream.prototype.pipeTo = function (destination, rawOptions) {
+        if (rawOptions === void 0) { rawOptions = {}; }
+        if (!IsReadableStream(this)) {
+            return promiseRejectedWith(streamBrandCheckException$1('pipeTo'));
+        }
+        if (destination === undefined) {
+            return promiseRejectedWith("Parameter 1 is required in 'pipeTo'.");
+        }
+        if (!IsWritableStream(destination)) {
+            return promiseRejectedWith(new TypeError("ReadableStream.prototype.pipeTo's first argument must be a WritableStream"));
+        }
+        var options;
+        try {
+            options = convertPipeOptions(rawOptions, 'Second parameter');
+        }
+        catch (e) {
+            return promiseRejectedWith(e);
+        }
+        if (IsReadableStreamLocked(this)) {
+            return promiseRejectedWith(new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream'));
+        }
+        if (IsWritableStreamLocked(destination)) {
+            return promiseRejectedWith(new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream'));
+        }
+        return ReadableStreamPipeTo(this, destination, options.preventClose, options.preventAbort, options.preventCancel, options.signal);
+    };
+    /**
+     * Tees this readable stream, returning a two-element array containing the two resulting branches as
+     * new {@link ReadableStream} instances.
+     *
+     * Teeing a stream will lock it, preventing any other consumer from acquiring a reader.
+     * To cancel the stream, cancel both of the resulting branches; a composite cancellation reason will then be
+     * propagated to the stream's underlying source.
+     *
+     * Note that the chunks seen in each branch will be the same object. If the chunks are not immutable,
+     * this could allow interference between the two branches.
+     */
+    ReadableStream.prototype.tee = function () {
+        if (!IsReadableStream(this)) {
+            throw streamBrandCheckException$1('tee');
+        }
+        var branches = ReadableStreamTee(this);
+        return CreateArrayFromList(branches);
+    };
+    ReadableStream.prototype.values = function (rawOptions) {
+        if (rawOptions === void 0) { rawOptions = undefined; }
+        if (!IsReadableStream(this)) {
+            throw streamBrandCheckException$1('values');
+        }
+        var options = convertIteratorOptions(rawOptions, 'First parameter');
+        return AcquireReadableStreamAsyncIterator(this, options.preventCancel);
+    };
+    return ReadableStream;
+}());
+Object.defineProperties(ReadableStream.prototype, {
+    cancel: { enumerable: true },
+    getReader: { enumerable: true },
+    pipeThrough: { enumerable: true },
+    pipeTo: { enumerable: true },
+    tee: { enumerable: true },
+    values: { enumerable: true },
+    locked: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableStream.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableStream',
+        configurable: true
+    });
+}
+if (typeof SymbolPolyfill.asyncIterator === 'symbol') {
+    Object.defineProperty(ReadableStream.prototype, SymbolPolyfill.asyncIterator, {
+        value: ReadableStream.prototype.values,
+        writable: true,
+        configurable: true
+    });
+}
+// Abstract operations for the ReadableStream.
+// Throws if and only if startAlgorithm throws.
+function CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm) {
+    if (highWaterMark === void 0) { highWaterMark = 1; }
+    if (sizeAlgorithm === void 0) { sizeAlgorithm = function () { return 1; }; }
+    var stream = Object.create(ReadableStream.prototype);
+    InitializeReadableStream(stream);
+    var controller = Object.create(ReadableStreamDefaultController.prototype);
+    SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm);
+    return stream;
+}
+// Throws if and only if startAlgorithm throws.
+function CreateReadableByteStream(startAlgorithm, pullAlgorithm, cancelAlgorithm) {
+    var stream = Object.create(ReadableStream.prototype);
+    InitializeReadableStream(stream);
+    var controller = Object.create(ReadableByteStreamController.prototype);
+    SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, 0, undefined);
+    return stream;
+}
+function InitializeReadableStream(stream) {
+    stream._state = 'readable';
+    stream._reader = undefined;
+    stream._storedError = undefined;
+    stream._disturbed = false;
+}
+function IsReadableStream(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_readableStreamController')) {
+        return false;
+    }
+    return x instanceof ReadableStream;
+}
+function IsReadableStreamLocked(stream) {
+    if (stream._reader === undefined) {
+        return false;
+    }
+    return true;
+}
+// ReadableStream API exposed for controllers.
+function ReadableStreamCancel(stream, reason) {
+    stream._disturbed = true;
+    if (stream._state === 'closed') {
+        return promiseResolvedWith(undefined);
+    }
+    if (stream._state === 'errored') {
+        return promiseRejectedWith(stream._storedError);
+    }
+    ReadableStreamClose(stream);
+    var reader = stream._reader;
+    if (reader !== undefined && IsReadableStreamBYOBReader(reader)) {
+        reader._readIntoRequests.forEach(function (readIntoRequest) {
+            readIntoRequest._closeSteps(undefined);
+        });
+        reader._readIntoRequests = new SimpleQueue();
+    }
+    var sourceCancelPromise = stream._readableStreamController[CancelSteps](reason);
+    return transformPromiseWith(sourceCancelPromise, noop);
+}
+function ReadableStreamClose(stream) {
+    stream._state = 'closed';
+    var reader = stream._reader;
+    if (reader === undefined) {
+        return;
+    }
+    defaultReaderClosedPromiseResolve(reader);
+    if (IsReadableStreamDefaultReader(reader)) {
+        reader._readRequests.forEach(function (readRequest) {
+            readRequest._closeSteps();
+        });
+        reader._readRequests = new SimpleQueue();
+    }
+}
+function ReadableStreamError(stream, e) {
+    stream._state = 'errored';
+    stream._storedError = e;
+    var reader = stream._reader;
+    if (reader === undefined) {
+        return;
+    }
+    defaultReaderClosedPromiseReject(reader, e);
+    if (IsReadableStreamDefaultReader(reader)) {
+        reader._readRequests.forEach(function (readRequest) {
+            readRequest._errorSteps(e);
+        });
+        reader._readRequests = new SimpleQueue();
+    }
+    else {
+        reader._readIntoRequests.forEach(function (readIntoRequest) {
+            readIntoRequest._errorSteps(e);
+        });
+        reader._readIntoRequests = new SimpleQueue();
+    }
+}
+// Helper functions for the ReadableStream.
+function streamBrandCheckException$1(name) {
+    return new TypeError("ReadableStream.prototype." + name + " can only be used on a ReadableStream");
+}
+
+function convertQueuingStrategyInit(init, context) {
+    assertDictionary(init, context);
+    var highWaterMark = init === null || init === void 0 ? void 0 : init.highWaterMark;
+    assertRequiredField(highWaterMark, 'highWaterMark', 'QueuingStrategyInit');
+    return {
+        highWaterMark: convertUnrestrictedDouble(highWaterMark)
+    };
+}
+
+// The size function must not have a prototype property nor be a constructor
+var byteLengthSizeFunction = function (chunk) {
+    return chunk.byteLength;
+};
+try {
+    Object.defineProperty(byteLengthSizeFunction, 'name', {
+        value: 'size',
+        configurable: true
+    });
+}
+catch (_a) {
+    // This property is non-configurable in older browsers, so ignore if this throws.
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility
+}
+/**
+ * A queuing strategy that counts the number of bytes in each chunk.
+ *
+ * @public
+ */
+var ByteLengthQueuingStrategy = /** @class */ (function () {
+    function ByteLengthQueuingStrategy(options) {
+        assertRequiredArgument(options, 1, 'ByteLengthQueuingStrategy');
+        options = convertQueuingStrategyInit(options, 'First parameter');
+        this._byteLengthQueuingStrategyHighWaterMark = options.highWaterMark;
+    }
+    Object.defineProperty(ByteLengthQueuingStrategy.prototype, "highWaterMark", {
+        /**
+         * Returns the high water mark provided to the constructor.
+         */
+        get: function () {
+            if (!IsByteLengthQueuingStrategy(this)) {
+                throw byteLengthBrandCheckException('highWaterMark');
+            }
+            return this._byteLengthQueuingStrategyHighWaterMark;
+        },
+        enumerable: false,
+        configurable: true
+    });
+    Object.defineProperty(ByteLengthQueuingStrategy.prototype, "size", {
+        /**
+         * Measures the size of `chunk` by returning the value of its `byteLength` property.
+         */
+        get: function () {
+            if (!IsByteLengthQueuingStrategy(this)) {
+                throw byteLengthBrandCheckException('size');
+            }
+            return byteLengthSizeFunction;
+        },
+        enumerable: false,
+        configurable: true
+    });
+    return ByteLengthQueuingStrategy;
+}());
+Object.defineProperties(ByteLengthQueuingStrategy.prototype, {
+    highWaterMark: { enumerable: true },
+    size: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ByteLengthQueuingStrategy.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ByteLengthQueuingStrategy',
+        configurable: true
+    });
+}
+// Helper functions for the ByteLengthQueuingStrategy.
+function byteLengthBrandCheckException(name) {
+    return new TypeError("ByteLengthQueuingStrategy.prototype." + name + " can only be used on a ByteLengthQueuingStrategy");
+}
+function IsByteLengthQueuingStrategy(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_byteLengthQueuingStrategyHighWaterMark')) {
+        return false;
+    }
+    return x instanceof ByteLengthQueuingStrategy;
+}
+
+// The size function must not have a prototype property nor be a constructor
+var countSizeFunction = function () {
+    return 1;
+};
+try {
+    Object.defineProperty(countSizeFunction, 'name', {
+        value: 'size',
+        configurable: true
+    });
+}
+catch (_a) {
+    // This property is non-configurable in older browsers, so ignore if this throws.
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility
+}
+/**
+ * A queuing strategy that counts the number of chunks.
+ *
+ * @public
+ */
+var CountQueuingStrategy = /** @class */ (function () {
+    function CountQueuingStrategy(options) {
+        assertRequiredArgument(options, 1, 'CountQueuingStrategy');
+        options = convertQueuingStrategyInit(options, 'First parameter');
+        this._countQueuingStrategyHighWaterMark = options.highWaterMark;
+    }
+    Object.defineProperty(CountQueuingStrategy.prototype, "highWaterMark", {
+        /**
+         * Returns the high water mark provided to the constructor.
+         */
+        get: function () {
+            if (!IsCountQueuingStrategy(this)) {
+                throw countBrandCheckException('highWaterMark');
+            }
+            return this._countQueuingStrategyHighWaterMark;
+        },
+        enumerable: false,
+        configurable: true
+    });
+    Object.defineProperty(CountQueuingStrategy.prototype, "size", {
+        /**
+         * Measures the size of `chunk` by always returning 1.
+         * This ensures that the total queue size is a count of the number of chunks in the queue.
+         */
+        get: function () {
+            if (!IsCountQueuingStrategy(this)) {
+                throw countBrandCheckException('size');
+            }
+            return countSizeFunction;
+        },
+        enumerable: false,
+        configurable: true
+    });
+    return CountQueuingStrategy;
+}());
+Object.defineProperties(CountQueuingStrategy.prototype, {
+    highWaterMark: { enumerable: true },
+    size: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(CountQueuingStrategy.prototype, SymbolPolyfill.toStringTag, {
+        value: 'CountQueuingStrategy',
+        configurable: true
+    });
+}
+// Helper functions for the CountQueuingStrategy.
+function countBrandCheckException(name) {
+    return new TypeError("CountQueuingStrategy.prototype." + name + " can only be used on a CountQueuingStrategy");
+}
+function IsCountQueuingStrategy(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_countQueuingStrategyHighWaterMark')) {
+        return false;
+    }
+    return x instanceof CountQueuingStrategy;
+}
+
+function convertTransformer(original, context) {
+    assertDictionary(original, context);
+    var flush = original === null || original === void 0 ? void 0 : original.flush;
+    var readableType = original === null || original === void 0 ? void 0 : original.readableType;
+    var start = original === null || original === void 0 ? void 0 : original.start;
+    var transform = original === null || original === void 0 ? void 0 : original.transform;
+    var writableType = original === null || original === void 0 ? void 0 : original.writableType;
+    return {
+        flush: flush === undefined ?
+            undefined :
+            convertTransformerFlushCallback(flush, original, context + " has member 'flush' that"),
+        readableType: readableType,
+        start: start === undefined ?
+            undefined :
+            convertTransformerStartCallback(start, original, context + " has member 'start' that"),
+        transform: transform === undefined ?
+            undefined :
+            convertTransformerTransformCallback(transform, original, context + " has member 'transform' that"),
+        writableType: writableType
+    };
+}
+function convertTransformerFlushCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return function (controller) { return promiseCall(fn, original, [controller]); };
+}
+function convertTransformerStartCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return function (controller) { return reflectCall(fn, original, [controller]); };
+}
+function convertTransformerTransformCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return function (chunk, controller) { return promiseCall(fn, original, [chunk, controller]); };
+}
+
+// Class TransformStream
+/**
+ * A transform stream consists of a pair of streams: a {@link WritableStream | writable stream},
+ * known as its writable side, and a {@link ReadableStream | readable stream}, known as its readable side.
+ * In a manner specific to the transform stream in question, writes to the writable side result in new data being
+ * made available for reading from the readable side.
+ *
+ * @public
+ */
+var TransformStream = /** @class */ (function () {
+    function TransformStream(rawTransformer, rawWritableStrategy, rawReadableStrategy) {
+        if (rawTransformer === void 0) { rawTransformer = {}; }
+        if (rawWritableStrategy === void 0) { rawWritableStrategy = {}; }
+        if (rawReadableStrategy === void 0) { rawReadableStrategy = {}; }
+        if (rawTransformer === undefined) {
+            rawTransformer = null;
+        }
+        var writableStrategy = convertQueuingStrategy(rawWritableStrategy, 'Second parameter');
+        var readableStrategy = convertQueuingStrategy(rawReadableStrategy, 'Third parameter');
+        var transformer = convertTransformer(rawTransformer, 'First parameter');
+        if (transformer.readableType !== undefined) {
+            throw new RangeError('Invalid readableType specified');
+        }
+        if (transformer.writableType !== undefined) {
+            throw new RangeError('Invalid writableType specified');
+        }
+        var readableHighWaterMark = ExtractHighWaterMark(readableStrategy, 0);
+        var readableSizeAlgorithm = ExtractSizeAlgorithm(readableStrategy);
+        var writableHighWaterMark = ExtractHighWaterMark(writableStrategy, 1);
+        var writableSizeAlgorithm = ExtractSizeAlgorithm(writableStrategy);
+        var startPromise_resolve;
+        var startPromise = newPromise(function (resolve) {
+            startPromise_resolve = resolve;
+        });
+        InitializeTransformStream(this, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm);
+        SetUpTransformStreamDefaultControllerFromTransformer(this, transformer);
+        if (transformer.start !== undefined) {
+            startPromise_resolve(transformer.start(this._transformStreamController));
+        }
+        else {
+            startPromise_resolve(undefined);
+        }
+    }
+    Object.defineProperty(TransformStream.prototype, "readable", {
+        /**
+         * The readable side of the transform stream.
+         */
+        get: function () {
+            if (!IsTransformStream(this)) {
+                throw streamBrandCheckException('readable');
+            }
+            return this._readable;
+        },
+        enumerable: false,
+        configurable: true
+    });
+    Object.defineProperty(TransformStream.prototype, "writable", {
+        /**
+         * The writable side of the transform stream.
+         */
+        get: function () {
+            if (!IsTransformStream(this)) {
+                throw streamBrandCheckException('writable');
+            }
+            return this._writable;
+        },
+        enumerable: false,
+        configurable: true
+    });
+    return TransformStream;
+}());
+Object.defineProperties(TransformStream.prototype, {
+    readable: { enumerable: true },
+    writable: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(TransformStream.prototype, SymbolPolyfill.toStringTag, {
+        value: 'TransformStream',
+        configurable: true
+    });
+}
+function InitializeTransformStream(stream, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm) {
+    function startAlgorithm() {
+        return startPromise;
+    }
+    function writeAlgorithm(chunk) {
+        return TransformStreamDefaultSinkWriteAlgorithm(stream, chunk);
+    }
+    function abortAlgorithm(reason) {
+        return TransformStreamDefaultSinkAbortAlgorithm(stream, reason);
+    }
+    function closeAlgorithm() {
+        return TransformStreamDefaultSinkCloseAlgorithm(stream);
+    }
+    stream._writable = CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, writableHighWaterMark, writableSizeAlgorithm);
+    function pullAlgorithm() {
+        return TransformStreamDefaultSourcePullAlgorithm(stream);
+    }
+    function cancelAlgorithm(reason) {
+        TransformStreamErrorWritableAndUnblockWrite(stream, reason);
+        return promiseResolvedWith(undefined);
+    }
+    stream._readable = CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, readableHighWaterMark, readableSizeAlgorithm);
+    // The [[backpressure]] slot is set to undefined so that it can be initialised by TransformStreamSetBackpressure.
+    stream._backpressure = undefined;
+    stream._backpressureChangePromise = undefined;
+    stream._backpressureChangePromise_resolve = undefined;
+    TransformStreamSetBackpressure(stream, true);
+    stream._transformStreamController = undefined;
+}
+function IsTransformStream(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_transformStreamController')) {
+        return false;
+    }
+    return x instanceof TransformStream;
+}
+// This is a no-op if both sides are already errored.
+function TransformStreamError(stream, e) {
+    ReadableStreamDefaultControllerError(stream._readable._readableStreamController, e);
+    TransformStreamErrorWritableAndUnblockWrite(stream, e);
+}
+function TransformStreamErrorWritableAndUnblockWrite(stream, e) {
+    TransformStreamDefaultControllerClearAlgorithms(stream._transformStreamController);
+    WritableStreamDefaultControllerErrorIfNeeded(stream._writable._writableStreamController, e);
+    if (stream._backpressure) {
+        // Pretend that pull() was called to permit any pending write() calls to complete. TransformStreamSetBackpressure()
+        // cannot be called from enqueue() or pull() once the ReadableStream is errored, so this will will be the final time
+        // _backpressure is set.
+        TransformStreamSetBackpressure(stream, false);
+    }
+}
+function TransformStreamSetBackpressure(stream, backpressure) {
+    // Passes also when called during construction.
+    if (stream._backpressureChangePromise !== undefined) {
+        stream._backpressureChangePromise_resolve();
+    }
+    stream._backpressureChangePromise = newPromise(function (resolve) {
+        stream._backpressureChangePromise_resolve = resolve;
+    });
+    stream._backpressure = backpressure;
+}
+// Class TransformStreamDefaultController
+/**
+ * Allows control of the {@link ReadableStream} and {@link WritableStream} of the associated {@link TransformStream}.
+ *
+ * @public
+ */
+var TransformStreamDefaultController = /** @class */ (function () {
+    function TransformStreamDefaultController() {
+        throw new TypeError('Illegal constructor');
+    }
+    Object.defineProperty(TransformStreamDefaultController.prototype, "desiredSize", {
+        /**
+         * Returns the desired size to fill the readable side’s internal queue. It can be negative, if the queue is over-full.
+         */
+        get: function () {
+            if (!IsTransformStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException('desiredSize');
+            }
+            var readableController = this._controlledTransformStream._readable._readableStreamController;
+            return ReadableStreamDefaultControllerGetDesiredSize(readableController);
+        },
+        enumerable: false,
+        configurable: true
+    });
+    TransformStreamDefaultController.prototype.enqueue = function (chunk) {
+        if (chunk === void 0) { chunk = undefined; }
+        if (!IsTransformStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException('enqueue');
+        }
+        TransformStreamDefaultControllerEnqueue(this, chunk);
+    };
+    /**
+     * Errors both the readable side and the writable side of the controlled transform stream, making all future
+     * interactions with it fail with the given error `e`. Any chunks queued for transformation will be discarded.
+     */
+    TransformStreamDefaultController.prototype.error = function (reason) {
+        if (reason === void 0) { reason = undefined; }
+        if (!IsTransformStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException('error');
+        }
+        TransformStreamDefaultControllerError(this, reason);
+    };
+    /**
+     * Closes the readable side and errors the writable side of the controlled transform stream. This is useful when the
+     * transformer only needs to consume a portion of the chunks written to the writable side.
+     */
+    TransformStreamDefaultController.prototype.terminate = function () {
+        if (!IsTransformStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException('terminate');
+        }
+        TransformStreamDefaultControllerTerminate(this);
+    };
+    return TransformStreamDefaultController;
+}());
+Object.defineProperties(TransformStreamDefaultController.prototype, {
+    enqueue: { enumerable: true },
+    error: { enumerable: true },
+    terminate: { enumerable: true },
+    desiredSize: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(TransformStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+        value: 'TransformStreamDefaultController',
+        configurable: true
+    });
+}
+// Transform Stream Default Controller Abstract Operations
+function IsTransformStreamDefaultController(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_controlledTransformStream')) {
+        return false;
+    }
+    return x instanceof TransformStreamDefaultController;
+}
+function SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm) {
+    controller._controlledTransformStream = stream;
+    stream._transformStreamController = controller;
+    controller._transformAlgorithm = transformAlgorithm;
+    controller._flushAlgorithm = flushAlgorithm;
+}
+function SetUpTransformStreamDefaultControllerFromTransformer(stream, transformer) {
+    var controller = Object.create(TransformStreamDefaultController.prototype);
+    var transformAlgorithm = function (chunk) {
+        try {
+            TransformStreamDefaultControllerEnqueue(controller, chunk);
+            return promiseResolvedWith(undefined);
+        }
+        catch (transformResultE) {
+            return promiseRejectedWith(transformResultE);
+        }
+    };
+    var flushAlgorithm = function () { return promiseResolvedWith(undefined); };
+    if (transformer.transform !== undefined) {
+        transformAlgorithm = function (chunk) { return transformer.transform(chunk, controller); };
+    }
+    if (transformer.flush !== undefined) {
+        flushAlgorithm = function () { return transformer.flush(controller); };
+    }
+    SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);
+}
+function TransformStreamDefaultControllerClearAlgorithms(controller) {
+    controller._transformAlgorithm = undefined;
+    controller._flushAlgorithm = undefined;
+}
+function TransformStreamDefaultControllerEnqueue(controller, chunk) {
+    var stream = controller._controlledTransformStream;
+    var readableController = stream._readable._readableStreamController;
+    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(readableController)) {
+        throw new TypeError('Readable side is not in a state that permits enqueue');
+    }
+    // We throttle transform invocations based on the backpressure of the ReadableStream, but we still
+    // accept TransformStreamDefaultControllerEnqueue() calls.
+    try {
+        ReadableStreamDefaultControllerEnqueue(readableController, chunk);
+    }
+    catch (e) {
+        // This happens when readableStrategy.size() throws.
+        TransformStreamErrorWritableAndUnblockWrite(stream, e);
+        throw stream._readable._storedError;
+    }
+    var backpressure = ReadableStreamDefaultControllerHasBackpressure(readableController);
+    if (backpressure !== stream._backpressure) {
+        TransformStreamSetBackpressure(stream, true);
+    }
+}
+function TransformStreamDefaultControllerError(controller, e) {
+    TransformStreamError(controller._controlledTransformStream, e);
+}
+function TransformStreamDefaultControllerPerformTransform(controller, chunk) {
+    var transformPromise = controller._transformAlgorithm(chunk);
+    return transformPromiseWith(transformPromise, undefined, function (r) {
+        TransformStreamError(controller._controlledTransformStream, r);
+        throw r;
+    });
+}
+function TransformStreamDefaultControllerTerminate(controller) {
+    var stream = controller._controlledTransformStream;
+    var readableController = stream._readable._readableStreamController;
+    ReadableStreamDefaultControllerClose(readableController);
+    var error = new TypeError('TransformStream terminated');
+    TransformStreamErrorWritableAndUnblockWrite(stream, error);
+}
+// TransformStreamDefaultSink Algorithms
+function TransformStreamDefaultSinkWriteAlgorithm(stream, chunk) {
+    var controller = stream._transformStreamController;
+    if (stream._backpressure) {
+        var backpressureChangePromise = stream._backpressureChangePromise;
+        return transformPromiseWith(backpressureChangePromise, function () {
+            var writable = stream._writable;
+            var state = writable._state;
+            if (state === 'erroring') {
+                throw writable._storedError;
+            }
+            return TransformStreamDefaultControllerPerformTransform(controller, chunk);
+        });
+    }
+    return TransformStreamDefaultControllerPerformTransform(controller, chunk);
+}
+function TransformStreamDefaultSinkAbortAlgorithm(stream, reason) {
+    // abort() is not called synchronously, so it is possible for abort() to be called when the stream is already
+    // errored.
+    TransformStreamError(stream, reason);
+    return promiseResolvedWith(undefined);
+}
+function TransformStreamDefaultSinkCloseAlgorithm(stream) {
+    // stream._readable cannot change after construction, so caching it across a call to user code is safe.
+    var readable = stream._readable;
+    var controller = stream._transformStreamController;
+    var flushPromise = controller._flushAlgorithm();
+    TransformStreamDefaultControllerClearAlgorithms(controller);
+    // Return a promise that is fulfilled with undefined on success.
+    return transformPromiseWith(flushPromise, function () {
+        if (readable._state === 'errored') {
+            throw readable._storedError;
+        }
+        ReadableStreamDefaultControllerClose(readable._readableStreamController);
+    }, function (r) {
+        TransformStreamError(stream, r);
+        throw readable._storedError;
+    });
+}
+// TransformStreamDefaultSource Algorithms
+function TransformStreamDefaultSourcePullAlgorithm(stream) {
+    // Invariant. Enforced by the promises returned by start() and pull().
+    TransformStreamSetBackpressure(stream, false);
+    // Prevent the next pull() call until there is backpressure.
+    return stream._backpressureChangePromise;
+}
+// Helper functions for the TransformStreamDefaultController.
+function defaultControllerBrandCheckException(name) {
+    return new TypeError("TransformStreamDefaultController.prototype." + name + " can only be used on a TransformStreamDefaultController");
+}
+// Helper functions for the TransformStream.
+function streamBrandCheckException(name) {
+    return new TypeError("TransformStream.prototype." + name + " can only be used on a TransformStream");
+}
+
+var exports = {
+    ReadableStream: ReadableStream,
+    ReadableStreamDefaultController: ReadableStreamDefaultController,
+    ReadableByteStreamController: ReadableByteStreamController,
+    ReadableStreamBYOBRequest: ReadableStreamBYOBRequest,
+    ReadableStreamDefaultReader: ReadableStreamDefaultReader,
+    ReadableStreamBYOBReader: ReadableStreamBYOBReader,
+    WritableStream: WritableStream,
+    WritableStreamDefaultController: WritableStreamDefaultController,
+    WritableStreamDefaultWriter: WritableStreamDefaultWriter,
+    ByteLengthQueuingStrategy: ByteLengthQueuingStrategy,
+    CountQueuingStrategy: CountQueuingStrategy,
+    TransformStream: TransformStream,
+    TransformStreamDefaultController: TransformStreamDefaultController
+};
+// Add classes to global scope
+if (typeof globals !== 'undefined') {
+    for (var prop in exports) {
+        if (Object.prototype.hasOwnProperty.call(exports, prop)) {
+            Object.defineProperty(globals, prop, {
+                value: exports[prop],
+                writable: true,
+                configurable: true
+            });
+        }
+    }
+}
+
+export { ByteLengthQueuingStrategy, CountQueuingStrategy, ReadableByteStreamController, ReadableStream, ReadableStreamBYOBReader, ReadableStreamBYOBRequest, ReadableStreamDefaultController, ReadableStreamDefaultReader, TransformStream, TransformStreamDefaultController, WritableStream, WritableStreamDefaultController, WritableStreamDefaultWriter };
+//# sourceMappingURL=polyfill.mjs.map
diff --git a/node_modules/web-streams-polyfill/dist/polyfill.mjs.map b/node_modules/web-streams-polyfill/dist/polyfill.mjs.map
new file mode 100644
index 0000000..0d18d05
--- /dev/null
+++ b/node_modules/web-streams-polyfill/dist/polyfill.mjs.map
@@ -0,0 +1 @@
+{"version":3,"file":"polyfill.mjs","sources":["../src/stub/symbol.ts","../src/utils.ts","../src/lib/helpers/miscellaneous.ts","../src/lib/helpers/webidl.ts","../src/lib/simple-queue.ts","../src/lib/readable-stream/generic-reader.ts","../src/lib/abstract-ops/internal-methods.ts","../src/stub/number-isfinite.ts","../src/stub/math-trunc.ts","../src/lib/validators/basic.ts","../src/lib/validators/readable-stream.ts","../src/lib/readable-stream/default-reader.ts","../src/target/es5/stub/async-iterator-prototype.ts","../src/lib/readable-stream/async-iterator.ts","../src/stub/number-isnan.ts","../src/lib/abstract-ops/ecmascript.ts","../src/lib/abstract-ops/miscellaneous.ts","../src/lib/abstract-ops/queue-with-sizes.ts","../src/lib/readable-stream/byte-stream-controller.ts","../src/lib/readable-stream/byob-reader.ts","../src/lib/abstract-ops/queuing-strategy.ts","../src/lib/validators/queuing-strategy.ts","../src/lib/validators/underlying-sink.ts","../src/lib/validators/writable-stream.ts","../src/lib/abort-signal.ts","../src/lib/writable-stream.ts","../src/stub/native.ts","../src/stub/dom-exception.ts","../src/lib/readable-stream/pipe.ts","../src/lib/readable-stream/default-controller.ts","../src/lib/readable-stream/tee.ts","../src/lib/validators/underlying-source.ts","../src/lib/validators/reader-options.ts","../src/lib/validators/iterator-options.ts","../src/lib/validators/pipe-options.ts","../src/lib/validators/readable-writable-pair.ts","../src/lib/readable-stream.ts","../src/lib/validators/queuing-strategy-init.ts","../src/lib/byte-length-queuing-strategy.ts","../src/lib/count-queuing-strategy.ts","../src/lib/validators/transformer.ts","../src/lib/transform-stream.ts","../src/polyfill.ts"],"sourcesContent":["/// <reference lib=\"es2015.symbol\" />\n\nconst SymbolPolyfill: (description?: string) => symbol =\n  typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol' ?\n    Symbol :\n    description => `Symbol(${description})` as any as symbol;\n\nexport default SymbolPolyfill;\n","/// <reference lib=\"dom\" />\n\nexport function noop(): undefined {\n  return undefined;\n}\n\nfunction getGlobals() {\n  if (typeof self !== 'undefined') {\n    return self;\n  } else if (typeof window !== 'undefined') {\n    return window;\n  } else if (typeof global !== 'undefined') {\n    return global;\n  }\n  return undefined;\n}\n\nexport const globals = getGlobals();\n","import { noop } from '../../utils';\nimport { AssertionError } from '../../stub/assert';\n\nexport function typeIsObject(x: any): x is object {\n  return (typeof x === 'object' && x !== null) || typeof x === 'function';\n}\n\nexport const rethrowAssertionErrorRejection: (e: any) => void =\n  DEBUG ? e => {\n    // Used throughout the reference implementation, as `.catch(rethrowAssertionErrorRejection)`, to ensure any errors\n    // get shown. There are places in the spec where we do promise transformations and purposefully ignore or don't\n    // expect any errors, but assertion errors are always problematic.\n    if (e && e instanceof AssertionError) {\n      setTimeout(() => {\n        throw e;\n      }, 0);\n    }\n  } : noop;\n","import { globals } from '../../utils';\nimport { rethrowAssertionErrorRejection } from './miscellaneous';\nimport assert from '../../stub/assert';\n\nconst originalPromise = Promise;\nconst originalPromiseThen = Promise.prototype.then;\nconst originalPromiseResolve = Promise.resolve.bind(originalPromise);\nconst originalPromiseReject = Promise.reject.bind(originalPromise);\n\nexport function newPromise<T>(executor: (\n  resolve: (value: T | PromiseLike<T>) => void,\n  reject: (reason?: any) => void\n) => void): Promise<T> {\n  return new originalPromise(executor);\n}\n\nexport function promiseResolvedWith<T>(value: T | PromiseLike<T>): Promise<T> {\n  return originalPromiseResolve(value);\n}\n\nexport function promiseRejectedWith<T = never>(reason: any): Promise<T> {\n  return originalPromiseReject(reason);\n}\n\nexport function PerformPromiseThen<T, TResult1 = T, TResult2 = never>(\n  promise: Promise<T>,\n  onFulfilled?: (value: T) => TResult1 | PromiseLike<TResult1>,\n  onRejected?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2> {\n  // There doesn't appear to be any way to correctly emulate the behaviour from JavaScript, so this is just an\n  // approximation.\n  return originalPromiseThen.call(promise, onFulfilled, onRejected) as Promise<TResult1 | TResult2>;\n}\n\nexport function uponPromise<T>(\n  promise: Promise<T>,\n  onFulfilled?: (value: T) => void | PromiseLike<void>,\n  onRejected?: (reason: any) => void | PromiseLike<void>): void {\n  PerformPromiseThen(\n    PerformPromiseThen(promise, onFulfilled, onRejected),\n    undefined,\n    rethrowAssertionErrorRejection\n  );\n}\n\nexport function uponFulfillment<T>(promise: Promise<T>, onFulfilled: (value: T) => void | PromiseLike<void>): void {\n  uponPromise(promise, onFulfilled);\n}\n\nexport function uponRejection(promise: Promise<unknown>, onRejected: (reason: any) => void | PromiseLike<void>): void {\n  uponPromise(promise, undefined, onRejected);\n}\n\nexport function transformPromiseWith<T, TResult1 = T, TResult2 = never>(\n  promise: Promise<T>,\n  fulfillmentHandler?: (value: T) => TResult1 | PromiseLike<TResult1>,\n  rejectionHandler?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2> {\n  return PerformPromiseThen(promise, fulfillmentHandler, rejectionHandler);\n}\n\nexport function setPromiseIsHandledToTrue(promise: Promise<unknown>): void {\n  PerformPromiseThen(promise, undefined, rethrowAssertionErrorRejection);\n}\n\nexport const queueMicrotask: (fn: () => void) => void = (() => {\n  const globalQueueMicrotask = globals && globals.queueMicrotask;\n  if (typeof globalQueueMicrotask === 'function') {\n    return globalQueueMicrotask;\n  }\n\n  const resolvedPromise = promiseResolvedWith(undefined);\n  return (fn: () => void) => PerformPromiseThen(resolvedPromise, fn);\n})();\n\nexport function reflectCall<T, A extends any[], R>(F: (this: T, ...fnArgs: A) => R, V: T, args: A): R {\n  if (typeof F !== 'function') {\n    throw new TypeError('Argument is not a function');\n  }\n  return Function.prototype.apply.call(F, V, args);\n}\n\nexport function promiseCall<T, A extends any[], R>(F: (this: T, ...fnArgs: A) => R | PromiseLike<R>,\n                                                   V: T,\n                                                   args: A): Promise<R> {\n  assert(typeof F === 'function');\n  assert(V !== undefined);\n  assert(Array.isArray(args));\n  try {\n    return promiseResolvedWith(reflectCall(F, V, args));\n  } catch (value) {\n    return promiseRejectedWith(value);\n  }\n}\n","import assert from '../stub/assert';\n\n// Original from Chromium\n// https://chromium.googlesource.com/chromium/src/+/0aee4434a4dba42a42abaea9bfbc0cd196a63bc1/third_party/blink/renderer/core/streams/SimpleQueue.js\n\nconst QUEUE_MAX_ARRAY_SIZE = 16384;\n\ninterface Node<T> {\n  _elements: T[];\n  _next: Node<T> | undefined;\n}\n\n/**\n * Simple queue structure.\n *\n * Avoids scalability issues with using a packed array directly by using\n * multiple arrays in a linked list and keeping the array size bounded.\n */\nexport class SimpleQueue<T> {\n  private _front: Node<T>;\n  private _back: Node<T>;\n  private _cursor = 0;\n  private _size = 0;\n\n  constructor() {\n    // _front and _back are always defined.\n    this._front = {\n      _elements: [],\n      _next: undefined\n    };\n    this._back = this._front;\n    // The cursor is used to avoid calling Array.shift().\n    // It contains the index of the front element of the array inside the\n    // front-most node. It is always in the range [0, QUEUE_MAX_ARRAY_SIZE).\n    this._cursor = 0;\n    // When there is only one node, size === elements.length - cursor.\n    this._size = 0;\n  }\n\n  get length(): number {\n    return this._size;\n  }\n\n  // For exception safety, this method is structured in order:\n  // 1. Read state\n  // 2. Calculate required state mutations\n  // 3. Perform state mutations\n  push(element: T): void {\n    const oldBack = this._back;\n    let newBack = oldBack;\n    assert(oldBack._next === undefined);\n    if (oldBack._elements.length === QUEUE_MAX_ARRAY_SIZE - 1) {\n      newBack = {\n        _elements: [],\n        _next: undefined\n      };\n    }\n\n    // push() is the mutation most likely to throw an exception, so it\n    // goes first.\n    oldBack._elements.push(element);\n    if (newBack !== oldBack) {\n      this._back = newBack;\n      oldBack._next = newBack;\n    }\n    ++this._size;\n  }\n\n  // Like push(), shift() follows the read -> calculate -> mutate pattern for\n  // exception safety.\n  shift(): T {\n    assert(this._size > 0); // must not be called on an empty queue\n\n    const oldFront = this._front;\n    let newFront = oldFront;\n    const oldCursor = this._cursor;\n    let newCursor = oldCursor + 1;\n\n    const elements = oldFront._elements;\n    const element = elements[oldCursor];\n\n    if (newCursor === QUEUE_MAX_ARRAY_SIZE) {\n      assert(elements.length === QUEUE_MAX_ARRAY_SIZE);\n      assert(oldFront._next !== undefined);\n      newFront = oldFront._next!;\n      newCursor = 0;\n    }\n\n    // No mutations before this point.\n    --this._size;\n    this._cursor = newCursor;\n    if (oldFront !== newFront) {\n      this._front = newFront;\n    }\n\n    // Permit shifted element to be garbage collected.\n    elements[oldCursor] = undefined!;\n\n    return element;\n  }\n\n  // The tricky thing about forEach() is that it can be called\n  // re-entrantly. The queue may be mutated inside the callback. It is easy to\n  // see that push() within the callback has no negative effects since the end\n  // of the queue is checked for on every iteration. If shift() is called\n  // repeatedly within the callback then the next iteration may return an\n  // element that has been removed. In this case the callback will be called\n  // with undefined values until we either \"catch up\" with elements that still\n  // exist or reach the back of the queue.\n  forEach(callback: (element: T) => void): void {\n    let i = this._cursor;\n    let node = this._front;\n    let elements = node._elements;\n    while (i !== elements.length || node._next !== undefined) {\n      if (i === elements.length) {\n        assert(node._next !== undefined);\n        assert(i === QUEUE_MAX_ARRAY_SIZE);\n        node = node._next!;\n        elements = node._elements;\n        i = 0;\n        if (elements.length === 0) {\n          break;\n        }\n      }\n      callback(elements[i]);\n      ++i;\n    }\n  }\n\n  // Return the element that would be returned if shift() was called now,\n  // without modifying the queue.\n  peek(): T {\n    assert(this._size > 0); // must not be called on an empty queue\n\n    const front = this._front;\n    const cursor = this._cursor;\n    return front._elements[cursor];\n  }\n}\n","import assert from '../../stub/assert';\nimport { ReadableStream, ReadableStreamCancel, ReadableStreamReader } from '../readable-stream';\nimport { newPromise, setPromiseIsHandledToTrue } from '../helpers/webidl';\n\nexport function ReadableStreamReaderGenericInitialize<R>(reader: ReadableStreamReader<R>, stream: ReadableStream<R>) {\n  reader._ownerReadableStream = stream;\n  stream._reader = reader;\n\n  if (stream._state === 'readable') {\n    defaultReaderClosedPromiseInitialize(reader);\n  } else if (stream._state === 'closed') {\n    defaultReaderClosedPromiseInitializeAsResolved(reader);\n  } else {\n    assert(stream._state === 'errored');\n\n    defaultReaderClosedPromiseInitializeAsRejected(reader, stream._storedError);\n  }\n}\n\n// A client of ReadableStreamDefaultReader and ReadableStreamBYOBReader may use these functions directly to bypass state\n// check.\n\nexport function ReadableStreamReaderGenericCancel(reader: ReadableStreamReader<any>, reason: any): Promise<undefined> {\n  const stream = reader._ownerReadableStream;\n  assert(stream !== undefined);\n  return ReadableStreamCancel(stream, reason);\n}\n\nexport function ReadableStreamReaderGenericRelease(reader: ReadableStreamReader<any>) {\n  assert(reader._ownerReadableStream !== undefined);\n  assert(reader._ownerReadableStream._reader === reader);\n\n  if (reader._ownerReadableStream._state === 'readable') {\n    defaultReaderClosedPromiseReject(\n      reader,\n      new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));\n  } else {\n    defaultReaderClosedPromiseResetToRejected(\n      reader,\n      new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));\n  }\n\n  reader._ownerReadableStream._reader = undefined;\n  reader._ownerReadableStream = undefined!;\n}\n\n// Helper functions for the readers.\n\nexport function readerLockException(name: string): TypeError {\n  return new TypeError('Cannot ' + name + ' a stream using a released reader');\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nexport function defaultReaderClosedPromiseInitialize(reader: ReadableStreamReader<any>) {\n  reader._closedPromise = newPromise((resolve, reject) => {\n    reader._closedPromise_resolve = resolve;\n    reader._closedPromise_reject = reject;\n  });\n}\n\nexport function defaultReaderClosedPromiseInitializeAsRejected(reader: ReadableStreamReader<any>, reason: any) {\n  defaultReaderClosedPromiseInitialize(reader);\n  defaultReaderClosedPromiseReject(reader, reason);\n}\n\nexport function defaultReaderClosedPromiseInitializeAsResolved(reader: ReadableStreamReader<any>) {\n  defaultReaderClosedPromiseInitialize(reader);\n  defaultReaderClosedPromiseResolve(reader);\n}\n\nexport function defaultReaderClosedPromiseReject(reader: ReadableStreamReader<any>, reason: any) {\n  if (reader._closedPromise_reject === undefined) {\n    return;\n  }\n\n  setPromiseIsHandledToTrue(reader._closedPromise);\n  reader._closedPromise_reject(reason);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n\nexport function defaultReaderClosedPromiseResetToRejected(reader: ReadableStreamReader<any>, reason: any) {\n  assert(reader._closedPromise_resolve === undefined);\n  assert(reader._closedPromise_reject === undefined);\n\n  defaultReaderClosedPromiseInitializeAsRejected(reader, reason);\n}\n\nexport function defaultReaderClosedPromiseResolve(reader: ReadableStreamReader<any>) {\n  if (reader._closedPromise_resolve === undefined) {\n    return;\n  }\n\n  reader._closedPromise_resolve(undefined);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n","export const AbortSteps = Symbol('[[AbortSteps]]');\nexport const ErrorSteps = Symbol('[[ErrorSteps]]');\nexport const CancelSteps = Symbol('[[CancelSteps]]');\nexport const PullSteps = Symbol('[[PullSteps]]');\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite#Polyfill\nconst NumberIsFinite: typeof Number.isFinite = Number.isFinite || function (x) {\n  return typeof x === 'number' && isFinite(x);\n};\n\nexport default NumberIsFinite;\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc#Polyfill\nconst MathTrunc: typeof Math.trunc = Math.trunc || function (v) {\n  return v < 0 ? Math.ceil(v) : Math.floor(v);\n};\n\nexport default MathTrunc;\n","import NumberIsFinite from '../../stub/number-isfinite';\nimport MathTrunc from '../../stub/math-trunc';\n\n// https://heycam.github.io/webidl/#idl-dictionaries\nexport function isDictionary(x: any): x is object | null {\n  return typeof x === 'object' || typeof x === 'function';\n}\n\nexport function assertDictionary(obj: unknown,\n                                 context: string): asserts obj is object | null | undefined {\n  if (obj !== undefined && !isDictionary(obj)) {\n    throw new TypeError(`${context} is not an object.`);\n  }\n}\n\nexport type AnyFunction = (...args: any[]) => any;\n\n// https://heycam.github.io/webidl/#idl-callback-functions\nexport function assertFunction(x: unknown, context: string): asserts x is AnyFunction {\n  if (typeof x !== 'function') {\n    throw new TypeError(`${context} is not a function.`);\n  }\n}\n\n// https://heycam.github.io/webidl/#idl-object\nexport function isObject(x: any): x is object {\n  return (typeof x === 'object' && x !== null) || typeof x === 'function';\n}\n\nexport function assertObject(x: unknown,\n                             context: string): asserts x is object {\n  if (!isObject(x)) {\n    throw new TypeError(`${context} is not an object.`);\n  }\n}\n\nexport function assertRequiredArgument<T extends any>(x: T | undefined,\n                                                      position: number,\n                                                      context: string): asserts x is T {\n  if (x === undefined) {\n    throw new TypeError(`Parameter ${position} is required in '${context}'.`);\n  }\n}\n\nexport function assertRequiredField<T extends any>(x: T | undefined,\n                                                   field: string,\n                                                   context: string): asserts x is T {\n  if (x === undefined) {\n    throw new TypeError(`${field} is required in '${context}'.`);\n  }\n}\n\n// https://heycam.github.io/webidl/#idl-unrestricted-double\nexport function convertUnrestrictedDouble(value: unknown): number {\n  return Number(value);\n}\n\nfunction censorNegativeZero(x: number): number {\n  return x === 0 ? 0 : x;\n}\n\nfunction integerPart(x: number): number {\n  return censorNegativeZero(MathTrunc(x));\n}\n\n// https://heycam.github.io/webidl/#idl-unsigned-long-long\nexport function convertUnsignedLongLongWithEnforceRange(value: unknown, context: string): number {\n  const lowerBound = 0;\n  const upperBound = Number.MAX_SAFE_INTEGER;\n\n  let x = Number(value);\n  x = censorNegativeZero(x);\n\n  if (!NumberIsFinite(x)) {\n    throw new TypeError(`${context} is not a finite number`);\n  }\n\n  x = integerPart(x);\n\n  if (x < lowerBound || x > upperBound) {\n    throw new TypeError(`${context} is outside the accepted range of ${lowerBound} to ${upperBound}, inclusive`);\n  }\n\n  if (!NumberIsFinite(x) || x === 0) {\n    return 0;\n  }\n\n  // TODO Use BigInt if supported?\n  // let xBigInt = BigInt(integerPart(x));\n  // xBigInt = BigInt.asUintN(64, xBigInt);\n  // return Number(xBigInt);\n\n  return x;\n}\n","import { IsReadableStream, ReadableStream } from '../readable-stream';\n\nexport function assertReadableStream(x: unknown, context: string): asserts x is ReadableStream {\n  if (!IsReadableStream(x)) {\n    throw new TypeError(`${context} is not a ReadableStream.`);\n  }\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericInitialize,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport { IsReadableStreamLocked, ReadableStream } from '../readable-stream';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { PullSteps } from '../abstract-ops/internal-methods';\nimport { newPromise, promiseRejectedWith } from '../helpers/webidl';\nimport { assertRequiredArgument } from '../validators/basic';\nimport { assertReadableStream } from '../validators/readable-stream';\n\n/**\n * A result returned by {@link ReadableStreamDefaultReader.read}.\n *\n * @public\n */\nexport type ReadableStreamDefaultReadResult<T> = {\n  done: false;\n  value: T;\n} | {\n  done: true;\n  value?: undefined;\n}\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamDefaultReader<R>(stream: ReadableStream): ReadableStreamDefaultReader<R> {\n  return new ReadableStreamDefaultReader(stream);\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamAddReadRequest<R>(stream: ReadableStream<R>,\n                                                readRequest: ReadRequest<R>): void {\n  assert(IsReadableStreamDefaultReader(stream._reader));\n  assert(stream._state === 'readable');\n\n  (stream._reader! as ReadableStreamDefaultReader<R>)._readRequests.push(readRequest);\n}\n\nexport function ReadableStreamFulfillReadRequest<R>(stream: ReadableStream<R>, chunk: R | undefined, done: boolean) {\n  const reader = stream._reader as ReadableStreamDefaultReader<R>;\n\n  assert(reader._readRequests.length > 0);\n\n  const readRequest = reader._readRequests.shift()!;\n  if (done) {\n    readRequest._closeSteps();\n  } else {\n    readRequest._chunkSteps(chunk!);\n  }\n}\n\nexport function ReadableStreamGetNumReadRequests<R>(stream: ReadableStream<R>): number {\n  return (stream._reader as ReadableStreamDefaultReader<R>)._readRequests.length;\n}\n\nexport function ReadableStreamHasDefaultReader(stream: ReadableStream): boolean {\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return false;\n  }\n\n  if (!IsReadableStreamDefaultReader(reader)) {\n    return false;\n  }\n\n  return true;\n}\n\n// Readers\n\nexport interface ReadRequest<R> {\n  _chunkSteps(chunk: R): void;\n\n  _closeSteps(): void;\n\n  _errorSteps(e: any): void;\n}\n\n/**\n * A default reader vended by a {@link ReadableStream}.\n *\n * @public\n */\nexport class ReadableStreamDefaultReader<R = any> {\n  /** @internal */\n  _ownerReadableStream!: ReadableStream<R>;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readRequests: SimpleQueue<ReadRequest<R>>;\n\n  constructor(stream: ReadableStream<R>) {\n    assertRequiredArgument(stream, 1, 'ReadableStreamDefaultReader');\n    assertReadableStream(stream, 'First parameter');\n\n    if (IsReadableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n    }\n\n    ReadableStreamReaderGenericInitialize(this, stream);\n\n    this._readRequests = new SimpleQueue();\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed,\n   * or rejected if the stream ever errors or the reader's lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('cancel'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('cancel'));\n    }\n\n    return ReadableStreamReaderGenericCancel(this, reason);\n  }\n\n  /**\n   * Returns a promise that allows access to the next chunk from the stream's internal queue, if available.\n   *\n   * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.\n   */\n  read(): Promise<ReadableStreamDefaultReadResult<R>> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('read'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('read from'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamDefaultReadResult<R>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamDefaultReadResult<R>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),\n      _closeSteps: () => resolvePromise({ value: undefined, done: true }),\n      _errorSteps: e => rejectPromise(e)\n    };\n    ReadableStreamDefaultReaderRead(this, readRequest);\n    return promise;\n  }\n\n  /**\n   * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.\n   * If the associated stream is errored when the lock is released, the reader will appear errored in the same way\n   * from now on; otherwise, the reader will appear closed.\n   *\n   * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by\n   * the reader's {@link ReadableStreamDefaultReader.read | read()} method has not yet been settled. Attempting to\n   * do so will throw a `TypeError` and leave the reader locked to the stream.\n   */\n  releaseLock(): void {\n    if (!IsReadableStreamDefaultReader(this)) {\n      throw defaultReaderBrandCheckException('releaseLock');\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return;\n    }\n\n    if (this._readRequests.length > 0) {\n      throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n    }\n\n    ReadableStreamReaderGenericRelease(this);\n  }\n}\n\nObject.defineProperties(ReadableStreamDefaultReader.prototype, {\n  cancel: { enumerable: true },\n  read: { enumerable: true },\n  releaseLock: { enumerable: true },\n  closed: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamDefaultReader.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamDefaultReader',\n    configurable: true\n  });\n}\n\n// Abstract operations for the readers.\n\nexport function IsReadableStreamDefaultReader<R = any>(x: any): x is ReadableStreamDefaultReader<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readRequests')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamDefaultReader;\n}\n\nexport function ReadableStreamDefaultReaderRead<R>(reader: ReadableStreamDefaultReader<R>,\n                                                   readRequest: ReadRequest<R>): void {\n  const stream = reader._ownerReadableStream;\n\n  assert(stream !== undefined);\n\n  stream._disturbed = true;\n\n  if (stream._state === 'closed') {\n    readRequest._closeSteps();\n  } else if (stream._state === 'errored') {\n    readRequest._errorSteps(stream._storedError);\n  } else {\n    assert(stream._state === 'readable');\n    stream._readableStreamController[PullSteps](readRequest as ReadRequest<any>);\n  }\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nfunction defaultReaderBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamDefaultReader.prototype.${name} can only be used on a ReadableStreamDefaultReader`);\n}\n","/// <reference lib=\"es2018.asynciterable\" />\n\nexport let AsyncIteratorPrototype: AsyncIterable<any> | undefined;\n\nif (typeof Symbol.asyncIterator === 'symbol') {\n  // We're running inside a ES2018+ environment, but we're compiling to an older syntax.\n  // We cannot access %AsyncIteratorPrototype% without non-ES2018 syntax, but we can re-create it.\n  AsyncIteratorPrototype = {\n    // 25.1.3.1 %AsyncIteratorPrototype% [ @@asyncIterator ] ( )\n    // https://tc39.github.io/ecma262/#sec-asynciteratorprototype-asynciterator\n    [Symbol.asyncIterator](this: AsyncIterator<any>) {\n      return this;\n    }\n  };\n  Object.defineProperty(AsyncIteratorPrototype, Symbol.asyncIterator, { enumerable: false });\n}\n","/// <reference lib=\"es2018.asynciterable\" />\n\nimport { ReadableStream } from '../readable-stream';\nimport {\n  AcquireReadableStreamDefaultReader,\n  ReadableStreamDefaultReader,\n  ReadableStreamDefaultReaderRead,\n  ReadableStreamDefaultReadResult,\n  ReadRequest\n} from './default-reader';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport assert from '../../stub/assert';\nimport { AsyncIteratorPrototype } from '@@target/stub/async-iterator-prototype';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport {\n  newPromise,\n  promiseRejectedWith,\n  promiseResolvedWith,\n  queueMicrotask,\n  transformPromiseWith\n} from '../helpers/webidl';\n\n/**\n * An async iterator returned by {@link ReadableStream.values}.\n *\n * @public\n */\nexport interface ReadableStreamAsyncIterator<R> extends AsyncIterator<R> {\n  next(): Promise<IteratorResult<R, undefined>>;\n\n  return(value?: any): Promise<IteratorResult<any>>;\n}\n\nexport class ReadableStreamAsyncIteratorImpl<R> {\n  private readonly _reader: ReadableStreamDefaultReader<R>;\n  private readonly _preventCancel: boolean;\n  private _ongoingPromise: Promise<ReadableStreamDefaultReadResult<R>> | undefined = undefined;\n  private _isFinished = false;\n\n  constructor(reader: ReadableStreamDefaultReader<R>, preventCancel: boolean) {\n    this._reader = reader;\n    this._preventCancel = preventCancel;\n  }\n\n  next(): Promise<ReadableStreamDefaultReadResult<R>> {\n    const nextSteps = () => this._nextSteps();\n    this._ongoingPromise = this._ongoingPromise ?\n      transformPromiseWith(this._ongoingPromise, nextSteps, nextSteps) :\n      nextSteps();\n    return this._ongoingPromise;\n  }\n\n  return(value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    const returnSteps = () => this._returnSteps(value);\n    return this._ongoingPromise ?\n      transformPromiseWith(this._ongoingPromise, returnSteps, returnSteps) :\n      returnSteps();\n  }\n\n  private _nextSteps(): Promise<ReadableStreamDefaultReadResult<R>> {\n    if (this._isFinished) {\n      return Promise.resolve({ value: undefined, done: true });\n    }\n\n    const reader = this._reader;\n    if (reader._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('iterate'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamDefaultReadResult<R>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamDefaultReadResult<R>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => {\n        this._ongoingPromise = undefined;\n        // This needs to be delayed by one microtask, otherwise we stop pulling too early which breaks a test.\n        // FIXME Is this a bug in the specification, or in the test?\n        queueMicrotask(() => resolvePromise({ value: chunk, done: false }));\n      },\n      _closeSteps: () => {\n        this._ongoingPromise = undefined;\n        this._isFinished = true;\n        ReadableStreamReaderGenericRelease(reader);\n        resolvePromise({ value: undefined, done: true });\n      },\n      _errorSteps: reason => {\n        this._ongoingPromise = undefined;\n        this._isFinished = true;\n        ReadableStreamReaderGenericRelease(reader);\n        rejectPromise(reason);\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n    return promise;\n  }\n\n  private _returnSteps(value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (this._isFinished) {\n      return Promise.resolve({ value, done: true });\n    }\n    this._isFinished = true;\n\n    const reader = this._reader;\n    if (reader._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('finish iterating'));\n    }\n\n    assert(reader._readRequests.length === 0);\n\n    if (!this._preventCancel) {\n      const result = ReadableStreamReaderGenericCancel(reader, value);\n      ReadableStreamReaderGenericRelease(reader);\n      return transformPromiseWith(result, () => ({ value, done: true }));\n    }\n\n    ReadableStreamReaderGenericRelease(reader);\n    return promiseResolvedWith({ value, done: true });\n  }\n}\n\ndeclare class ReadableStreamAsyncIteratorInstance<R> implements ReadableStreamAsyncIterator<R> {\n  /** @interal */\n  _asyncIteratorImpl: ReadableStreamAsyncIteratorImpl<R>;\n\n  next(): Promise<IteratorResult<R, undefined>>;\n\n  return(value?: any): Promise<IteratorResult<any>>;\n}\n\nconst ReadableStreamAsyncIteratorPrototype: ReadableStreamAsyncIteratorInstance<any> = {\n  next(this: ReadableStreamAsyncIteratorInstance<any>): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (!IsReadableStreamAsyncIterator(this)) {\n      return promiseRejectedWith(streamAsyncIteratorBrandCheckException('next'));\n    }\n    return this._asyncIteratorImpl.next();\n  },\n\n  return(this: ReadableStreamAsyncIteratorInstance<any>, value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (!IsReadableStreamAsyncIterator(this)) {\n      return promiseRejectedWith(streamAsyncIteratorBrandCheckException('return'));\n    }\n    return this._asyncIteratorImpl.return(value);\n  }\n} as any;\nif (AsyncIteratorPrototype !== undefined) {\n  Object.setPrototypeOf(ReadableStreamAsyncIteratorPrototype, AsyncIteratorPrototype);\n}\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamAsyncIterator<R>(stream: ReadableStream<R>,\n                                                      preventCancel: boolean): ReadableStreamAsyncIterator<R> {\n  const reader = AcquireReadableStreamDefaultReader<R>(stream);\n  const impl = new ReadableStreamAsyncIteratorImpl(reader, preventCancel);\n  const iterator: ReadableStreamAsyncIteratorInstance<R> = Object.create(ReadableStreamAsyncIteratorPrototype);\n  iterator._asyncIteratorImpl = impl;\n  return iterator;\n}\n\nfunction IsReadableStreamAsyncIterator<R = any>(x: any): x is ReadableStreamAsyncIterator<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_asyncIteratorImpl')) {\n    return false;\n  }\n\n  try {\n    // noinspection SuspiciousTypeOfGuard\n    return (x as ReadableStreamAsyncIteratorInstance<any>)._asyncIteratorImpl instanceof\n      ReadableStreamAsyncIteratorImpl;\n  } catch {\n    return false;\n  }\n}\n\n// Helper functions for the ReadableStream.\n\nfunction streamAsyncIteratorBrandCheckException(name: string): TypeError {\n  return new TypeError(`ReadableStreamAsyncIterator.${name} can only be used on a ReadableSteamAsyncIterator`);\n}\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Polyfill\nconst NumberIsNaN: typeof Number.isNaN = Number.isNaN || function (x) {\n  // eslint-disable-next-line no-self-compare\n  return x !== x;\n};\n\nexport default NumberIsNaN;\n","export function CreateArrayFromList<T extends any[]>(elements: T): T {\n  // We use arrays to represent lists, so this is basically a no-op.\n  // Do a slice though just in case we happen to depend on the unique-ness.\n  return elements.slice() as T;\n}\n\nexport function CopyDataBlockBytes(dest: ArrayBuffer,\n                                   destOffset: number,\n                                   src: ArrayBuffer,\n                                   srcOffset: number,\n                                   n: number) {\n  new Uint8Array(dest).set(new Uint8Array(src, srcOffset, n), destOffset);\n}\n\n// Not implemented correctly\nexport function TransferArrayBuffer<T extends ArrayBufferLike>(O: T): T {\n  return O;\n}\n\n// Not implemented correctly\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nexport function CanTransferArrayBuffer(O: ArrayBufferLike): boolean {\n  return true;\n}\n\n// Not implemented correctly\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nexport function IsDetachedBuffer(O: ArrayBufferLike): boolean {\n  return false;\n}\n\nexport function ArrayBufferSlice(buffer: ArrayBufferLike, begin: number, end: number): ArrayBufferLike {\n  // ArrayBuffer.prototype.slice is not available on IE10\n  // https://www.caniuse.com/mdn-javascript_builtins_arraybuffer_slice\n  if (buffer.slice) {\n    return buffer.slice(begin, end);\n  }\n  const length = end - begin;\n  const slice = new ArrayBuffer(length);\n  CopyDataBlockBytes(slice, 0, buffer, begin, length);\n  return slice;\n}\n","import NumberIsNaN from '../../stub/number-isnan';\nimport { ArrayBufferSlice } from './ecmascript';\n\nexport function IsNonNegativeNumber(v: number): boolean {\n  if (typeof v !== 'number') {\n    return false;\n  }\n\n  if (NumberIsNaN(v)) {\n    return false;\n  }\n\n  if (v < 0) {\n    return false;\n  }\n\n  return true;\n}\n\nexport function CloneAsUint8Array(O: ArrayBufferView): Uint8Array {\n  const buffer = ArrayBufferSlice(O.buffer, O.byteOffset, O.byteOffset + O.byteLength);\n  return new Uint8Array(buffer);\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport { IsNonNegativeNumber } from './miscellaneous';\n\nexport interface QueueContainer<T> {\n  _queue: SimpleQueue<T>;\n  _queueTotalSize: number;\n}\n\nexport interface QueuePair<T> {\n  value: T;\n  size: number;\n}\n\nexport function DequeueValue<T>(container: QueueContainer<QueuePair<T>>): T {\n  assert('_queue' in container && '_queueTotalSize' in container);\n  assert(container._queue.length > 0);\n\n  const pair = container._queue.shift()!;\n  container._queueTotalSize -= pair.size;\n  if (container._queueTotalSize < 0) {\n    container._queueTotalSize = 0;\n  }\n\n  return pair.value;\n}\n\nexport function EnqueueValueWithSize<T>(container: QueueContainer<QueuePair<T>>, value: T, size: number) {\n  assert('_queue' in container && '_queueTotalSize' in container);\n\n  if (!IsNonNegativeNumber(size) || size === Infinity) {\n    throw new RangeError('Size must be a finite, non-NaN, non-negative number.');\n  }\n\n  container._queue.push({ value, size });\n  container._queueTotalSize += size;\n}\n\nexport function PeekQueueValue<T>(container: QueueContainer<QueuePair<T>>): T {\n  assert('_queue' in container && '_queueTotalSize' in container);\n  assert(container._queue.length > 0);\n\n  const pair = container._queue.peek();\n  return pair.value;\n}\n\nexport function ResetQueue<T>(container: QueueContainer<T>) {\n  assert('_queue' in container && '_queueTotalSize' in container);\n\n  container._queue = new SimpleQueue<T>();\n  container._queueTotalSize = 0;\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport { ResetQueue } from '../abstract-ops/queue-with-sizes';\nimport {\n  ReadableStreamAddReadRequest,\n  ReadableStreamFulfillReadRequest,\n  ReadableStreamGetNumReadRequests,\n  ReadableStreamHasDefaultReader,\n  ReadRequest\n} from './default-reader';\nimport {\n  ReadableStreamAddReadIntoRequest,\n  ReadableStreamFulfillReadIntoRequest,\n  ReadableStreamGetNumReadIntoRequests,\n  ReadableStreamHasBYOBReader,\n  ReadIntoRequest\n} from './byob-reader';\nimport NumberIsInteger from '../../stub/number-isinteger';\nimport {\n  IsReadableStreamLocked,\n  ReadableByteStream,\n  ReadableStreamClose,\n  ReadableStreamError\n} from '../readable-stream';\nimport { ValidatedUnderlyingByteSource } from './underlying-source';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport {\n  ArrayBufferSlice,\n  CanTransferArrayBuffer,\n  CopyDataBlockBytes,\n  IsDetachedBuffer,\n  TransferArrayBuffer\n} from '../abstract-ops/ecmascript';\nimport { CancelSteps, PullSteps } from '../abstract-ops/internal-methods';\nimport { promiseResolvedWith, uponPromise } from '../helpers/webidl';\nimport { assertRequiredArgument, convertUnsignedLongLongWithEnforceRange } from '../validators/basic';\n\n/**\n * A pull-into request in a {@link ReadableByteStreamController}.\n *\n * @public\n */\nexport class ReadableStreamBYOBRequest {\n  /** @internal */\n  _associatedReadableByteStreamController!: ReadableByteStreamController;\n  /** @internal */\n  _view!: ArrayBufferView | null;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the view for writing in to, or `null` if the BYOB request has already been responded to.\n   */\n  get view(): ArrayBufferView | null {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('view');\n    }\n\n    return this._view;\n  }\n\n  /**\n   * Indicates to the associated readable byte stream that `bytesWritten` bytes were written into\n   * {@link ReadableStreamBYOBRequest.view | view}, causing the result be surfaced to the consumer.\n   *\n   * After this method is called, {@link ReadableStreamBYOBRequest.view | view} will be transferred and no longer\n   * modifiable.\n   */\n  respond(bytesWritten: number): void;\n  respond(bytesWritten: number | undefined): void {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('respond');\n    }\n    assertRequiredArgument(bytesWritten, 1, 'respond');\n    bytesWritten = convertUnsignedLongLongWithEnforceRange(bytesWritten, 'First parameter');\n\n    if (this._associatedReadableByteStreamController === undefined) {\n      throw new TypeError('This BYOB request has been invalidated');\n    }\n\n    if (IsDetachedBuffer(this._view!.buffer)) {\n      throw new TypeError(`The BYOB request's buffer has been detached and so cannot be used as a response`);\n    }\n\n    assert(this._view!.byteLength > 0);\n    assert(this._view!.buffer.byteLength > 0);\n\n    ReadableByteStreamControllerRespond(this._associatedReadableByteStreamController, bytesWritten);\n  }\n\n  /**\n   * Indicates to the associated readable byte stream that instead of writing into\n   * {@link ReadableStreamBYOBRequest.view | view}, the underlying byte source is providing a new `ArrayBufferView`,\n   * which will be given to the consumer of the readable byte stream.\n   *\n   * After this method is called, `view` will be transferred and no longer modifiable.\n   */\n  respondWithNewView(view: ArrayBufferView): void;\n  respondWithNewView(view: ArrayBufferView | undefined): void {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('respondWithNewView');\n    }\n    assertRequiredArgument(view, 1, 'respondWithNewView');\n\n    if (!ArrayBuffer.isView(view)) {\n      throw new TypeError('You can only respond with array buffer views');\n    }\n\n    if (this._associatedReadableByteStreamController === undefined) {\n      throw new TypeError('This BYOB request has been invalidated');\n    }\n\n    if (IsDetachedBuffer(view.buffer)) {\n      throw new TypeError('The given view\\'s buffer has been detached and so cannot be used as a response');\n    }\n\n    ReadableByteStreamControllerRespondWithNewView(this._associatedReadableByteStreamController, view);\n  }\n}\n\nObject.defineProperties(ReadableStreamBYOBRequest.prototype, {\n  respond: { enumerable: true },\n  respondWithNewView: { enumerable: true },\n  view: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamBYOBRequest.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamBYOBRequest',\n    configurable: true\n  });\n}\n\ninterface ArrayBufferViewConstructor<T extends ArrayBufferView = ArrayBufferView> {\n  new(buffer: ArrayBufferLike, byteOffset: number, length?: number): T;\n\n  readonly prototype: T;\n  readonly BYTES_PER_ELEMENT: number;\n}\n\ninterface ByteQueueElement {\n  buffer: ArrayBufferLike;\n  byteOffset: number;\n  byteLength: number;\n}\n\ntype PullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> =\n  DefaultPullIntoDescriptor\n  | BYOBPullIntoDescriptor<T>;\n\ninterface DefaultPullIntoDescriptor {\n  buffer: ArrayBufferLike;\n  bufferByteLength: number;\n  byteOffset: number;\n  byteLength: number;\n  bytesFilled: number;\n  elementSize: number;\n  viewConstructor: ArrayBufferViewConstructor<Uint8Array>;\n  readerType: 'default';\n}\n\ninterface BYOBPullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> {\n  buffer: ArrayBufferLike;\n  bufferByteLength: number;\n  byteOffset: number;\n  byteLength: number;\n  bytesFilled: number;\n  elementSize: number;\n  viewConstructor: ArrayBufferViewConstructor<T>;\n  readerType: 'byob';\n}\n\n/**\n * Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue.\n *\n * @public\n */\nexport class ReadableByteStreamController {\n  /** @internal */\n  _controlledReadableByteStream!: ReadableByteStream;\n  /** @internal */\n  _queue!: SimpleQueue<ByteQueueElement>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _closeRequested!: boolean;\n  /** @internal */\n  _pullAgain!: boolean;\n  /** @internal */\n  _pulling !: boolean;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _pullAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _cancelAlgorithm!: (reason: any) => Promise<void>;\n  /** @internal */\n  _autoAllocateChunkSize: number | undefined;\n  /** @internal */\n  _byobRequest: ReadableStreamBYOBRequest | null;\n  /** @internal */\n  _pendingPullIntos!: SimpleQueue<PullIntoDescriptor>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the current BYOB pull request, or `null` if there isn't one.\n   */\n  get byobRequest(): ReadableStreamBYOBRequest | null {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('byobRequest');\n    }\n\n    return ReadableByteStreamControllerGetBYOBRequest(this);\n  }\n\n  /**\n   * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is\n   * over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure.\n   */\n  get desiredSize(): number | null {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('desiredSize');\n    }\n\n    return ReadableByteStreamControllerGetDesiredSize(this);\n  }\n\n  /**\n   * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from\n   * the stream, but once those are read, the stream will become closed.\n   */\n  close(): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('close');\n    }\n\n    if (this._closeRequested) {\n      throw new TypeError('The stream has already been closed; do not close it again!');\n    }\n\n    const state = this._controlledReadableByteStream._state;\n    if (state !== 'readable') {\n      throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be closed`);\n    }\n\n    ReadableByteStreamControllerClose(this);\n  }\n\n  /**\n   * Enqueues the given chunk chunk in the controlled readable stream.\n   * The chunk has to be an `ArrayBufferView` instance, or else a `TypeError` will be thrown.\n   */\n  enqueue(chunk: ArrayBufferView): void;\n  enqueue(chunk: ArrayBufferView | undefined): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('enqueue');\n    }\n\n    assertRequiredArgument(chunk, 1, 'enqueue');\n    if (!ArrayBuffer.isView(chunk)) {\n      throw new TypeError('chunk must be an array buffer view');\n    }\n    if (chunk.byteLength === 0) {\n      throw new TypeError('chunk must have non-zero byteLength');\n    }\n    if (chunk.buffer.byteLength === 0) {\n      throw new TypeError(`chunk's buffer must have non-zero byteLength`);\n    }\n\n    if (this._closeRequested) {\n      throw new TypeError('stream is closed or draining');\n    }\n\n    const state = this._controlledReadableByteStream._state;\n    if (state !== 'readable') {\n      throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be enqueued to`);\n    }\n\n    ReadableByteStreamControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.\n   */\n  error(e: any = undefined): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('error');\n    }\n\n    ReadableByteStreamControllerError(this, e);\n  }\n\n  /** @internal */\n  [CancelSteps](reason: any): Promise<void> {\n    ReadableByteStreamControllerClearPendingPullIntos(this);\n\n    ResetQueue(this);\n\n    const result = this._cancelAlgorithm(reason);\n    ReadableByteStreamControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [PullSteps](readRequest: ReadRequest<Uint8Array>): void {\n    const stream = this._controlledReadableByteStream;\n    assert(ReadableStreamHasDefaultReader(stream));\n\n    if (this._queueTotalSize > 0) {\n      assert(ReadableStreamGetNumReadRequests(stream) === 0);\n\n      const entry = this._queue.shift()!;\n      this._queueTotalSize -= entry.byteLength;\n\n      ReadableByteStreamControllerHandleQueueDrain(this);\n\n      const view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);\n\n      readRequest._chunkSteps(view);\n      return;\n    }\n\n    const autoAllocateChunkSize = this._autoAllocateChunkSize;\n    if (autoAllocateChunkSize !== undefined) {\n      let buffer: ArrayBuffer;\n      try {\n        buffer = new ArrayBuffer(autoAllocateChunkSize);\n      } catch (bufferE) {\n        readRequest._errorSteps(bufferE);\n        return;\n      }\n\n      const pullIntoDescriptor: DefaultPullIntoDescriptor = {\n        buffer,\n        bufferByteLength: autoAllocateChunkSize,\n        byteOffset: 0,\n        byteLength: autoAllocateChunkSize,\n        bytesFilled: 0,\n        elementSize: 1,\n        viewConstructor: Uint8Array,\n        readerType: 'default'\n      };\n\n      this._pendingPullIntos.push(pullIntoDescriptor);\n    }\n\n    ReadableStreamAddReadRequest(stream, readRequest);\n    ReadableByteStreamControllerCallPullIfNeeded(this);\n  }\n}\n\nObject.defineProperties(ReadableByteStreamController.prototype, {\n  close: { enumerable: true },\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  byobRequest: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableByteStreamController.prototype, Symbol.toStringTag, {\n    value: 'ReadableByteStreamController',\n    configurable: true\n  });\n}\n\n// Abstract operations for the ReadableByteStreamController.\n\nexport function IsReadableByteStreamController(x: any): x is ReadableByteStreamController {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableByteStream')) {\n    return false;\n  }\n\n  return x instanceof ReadableByteStreamController;\n}\n\nfunction IsReadableStreamBYOBRequest(x: any): x is ReadableStreamBYOBRequest {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_associatedReadableByteStreamController')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamBYOBRequest;\n}\n\nfunction ReadableByteStreamControllerCallPullIfNeeded(controller: ReadableByteStreamController): void {\n  const shouldPull = ReadableByteStreamControllerShouldCallPull(controller);\n  if (!shouldPull) {\n    return;\n  }\n\n  if (controller._pulling) {\n    controller._pullAgain = true;\n    return;\n  }\n\n  assert(!controller._pullAgain);\n\n  controller._pulling = true;\n\n  // TODO: Test controller argument\n  const pullPromise = controller._pullAlgorithm();\n  uponPromise(\n    pullPromise,\n    () => {\n      controller._pulling = false;\n\n      if (controller._pullAgain) {\n        controller._pullAgain = false;\n        ReadableByteStreamControllerCallPullIfNeeded(controller);\n      }\n    },\n    e => {\n      ReadableByteStreamControllerError(controller, e);\n    }\n  );\n}\n\nfunction ReadableByteStreamControllerClearPendingPullIntos(controller: ReadableByteStreamController) {\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n  controller._pendingPullIntos = new SimpleQueue();\n}\n\nfunction ReadableByteStreamControllerCommitPullIntoDescriptor<T extends ArrayBufferView>(\n  stream: ReadableByteStream,\n  pullIntoDescriptor: PullIntoDescriptor<T>\n) {\n  assert(stream._state !== 'errored');\n\n  let done = false;\n  if (stream._state === 'closed') {\n    assert(pullIntoDescriptor.bytesFilled === 0);\n    done = true;\n  }\n\n  const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);\n  if (pullIntoDescriptor.readerType === 'default') {\n    ReadableStreamFulfillReadRequest(stream, filledView as unknown as Uint8Array, done);\n  } else {\n    assert(pullIntoDescriptor.readerType === 'byob');\n    ReadableStreamFulfillReadIntoRequest(stream, filledView, done);\n  }\n}\n\nfunction ReadableByteStreamControllerConvertPullIntoDescriptor<T extends ArrayBufferView>(\n  pullIntoDescriptor: PullIntoDescriptor<T>\n): T {\n  const bytesFilled = pullIntoDescriptor.bytesFilled;\n  const elementSize = pullIntoDescriptor.elementSize;\n\n  assert(bytesFilled <= pullIntoDescriptor.byteLength);\n  assert(bytesFilled % elementSize === 0);\n\n  return new pullIntoDescriptor.viewConstructor(\n    pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize) as T;\n}\n\nfunction ReadableByteStreamControllerEnqueueChunkToQueue(controller: ReadableByteStreamController,\n                                                         buffer: ArrayBufferLike,\n                                                         byteOffset: number,\n                                                         byteLength: number) {\n  controller._queue.push({ buffer, byteOffset, byteLength });\n  controller._queueTotalSize += byteLength;\n}\n\nfunction ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller: ReadableByteStreamController,\n                                                                     pullIntoDescriptor: PullIntoDescriptor) {\n  const elementSize = pullIntoDescriptor.elementSize;\n\n  const currentAlignedBytes = pullIntoDescriptor.bytesFilled - pullIntoDescriptor.bytesFilled % elementSize;\n\n  const maxBytesToCopy = Math.min(controller._queueTotalSize,\n                                  pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled);\n  const maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;\n  const maxAlignedBytes = maxBytesFilled - maxBytesFilled % elementSize;\n\n  let totalBytesToCopyRemaining = maxBytesToCopy;\n  let ready = false;\n  if (maxAlignedBytes > currentAlignedBytes) {\n    totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled;\n    ready = true;\n  }\n\n  const queue = controller._queue;\n\n  while (totalBytesToCopyRemaining > 0) {\n    const headOfQueue = queue.peek();\n\n    const bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength);\n\n    const destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n    CopyDataBlockBytes(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy);\n\n    if (headOfQueue.byteLength === bytesToCopy) {\n      queue.shift();\n    } else {\n      headOfQueue.byteOffset += bytesToCopy;\n      headOfQueue.byteLength -= bytesToCopy;\n    }\n    controller._queueTotalSize -= bytesToCopy;\n\n    ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor);\n\n    totalBytesToCopyRemaining -= bytesToCopy;\n  }\n\n  if (!ready) {\n    assert(controller._queueTotalSize === 0);\n    assert(pullIntoDescriptor.bytesFilled > 0);\n    assert(pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize);\n  }\n\n  return ready;\n}\n\nfunction ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller: ReadableByteStreamController,\n                                                                size: number,\n                                                                pullIntoDescriptor: PullIntoDescriptor) {\n  assert(controller._pendingPullIntos.length === 0 || controller._pendingPullIntos.peek() === pullIntoDescriptor);\n  assert(controller._byobRequest === null);\n  pullIntoDescriptor.bytesFilled += size;\n}\n\nfunction ReadableByteStreamControllerHandleQueueDrain(controller: ReadableByteStreamController) {\n  assert(controller._controlledReadableByteStream._state === 'readable');\n\n  if (controller._queueTotalSize === 0 && controller._closeRequested) {\n    ReadableByteStreamControllerClearAlgorithms(controller);\n    ReadableStreamClose(controller._controlledReadableByteStream);\n  } else {\n    ReadableByteStreamControllerCallPullIfNeeded(controller);\n  }\n}\n\nfunction ReadableByteStreamControllerInvalidateBYOBRequest(controller: ReadableByteStreamController) {\n  if (controller._byobRequest === null) {\n    return;\n  }\n\n  controller._byobRequest._associatedReadableByteStreamController = undefined!;\n  controller._byobRequest._view = null!;\n  controller._byobRequest = null;\n}\n\nfunction ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller: ReadableByteStreamController) {\n  assert(!controller._closeRequested);\n\n  while (controller._pendingPullIntos.length > 0) {\n    if (controller._queueTotalSize === 0) {\n      return;\n    }\n\n    const pullIntoDescriptor = controller._pendingPullIntos.peek();\n\n    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {\n      ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n      ReadableByteStreamControllerCommitPullIntoDescriptor(\n        controller._controlledReadableByteStream,\n        pullIntoDescriptor\n      );\n    }\n  }\n}\n\nexport function ReadableByteStreamControllerPullInto<T extends ArrayBufferView>(\n  controller: ReadableByteStreamController,\n  view: T,\n  readIntoRequest: ReadIntoRequest<T>\n): void {\n  const stream = controller._controlledReadableByteStream;\n\n  let elementSize = 1;\n  if (view.constructor !== DataView) {\n    elementSize = (view.constructor as ArrayBufferViewConstructor<T>).BYTES_PER_ELEMENT;\n  }\n\n  const ctor = view.constructor as ArrayBufferViewConstructor<T>;\n\n  // try {\n  const buffer = TransferArrayBuffer(view.buffer);\n  // } catch (e) {\n  //   readIntoRequest._errorSteps(e);\n  //   return;\n  // }\n\n  const pullIntoDescriptor: BYOBPullIntoDescriptor<T> = {\n    buffer,\n    bufferByteLength: buffer.byteLength,\n    byteOffset: view.byteOffset,\n    byteLength: view.byteLength,\n    bytesFilled: 0,\n    elementSize,\n    viewConstructor: ctor,\n    readerType: 'byob'\n  };\n\n  if (controller._pendingPullIntos.length > 0) {\n    controller._pendingPullIntos.push(pullIntoDescriptor);\n\n    // No ReadableByteStreamControllerCallPullIfNeeded() call since:\n    // - No change happens on desiredSize\n    // - The source has already been notified of that there's at least 1 pending read(view)\n\n    ReadableStreamAddReadIntoRequest(stream, readIntoRequest);\n    return;\n  }\n\n  if (stream._state === 'closed') {\n    const emptyView = new ctor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0);\n    readIntoRequest._closeSteps(emptyView);\n    return;\n  }\n\n  if (controller._queueTotalSize > 0) {\n    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {\n      const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);\n\n      ReadableByteStreamControllerHandleQueueDrain(controller);\n\n      readIntoRequest._chunkSteps(filledView);\n      return;\n    }\n\n    if (controller._closeRequested) {\n      const e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n      ReadableByteStreamControllerError(controller, e);\n\n      readIntoRequest._errorSteps(e);\n      return;\n    }\n  }\n\n  controller._pendingPullIntos.push(pullIntoDescriptor);\n\n  ReadableStreamAddReadIntoRequest<T>(stream, readIntoRequest);\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nfunction ReadableByteStreamControllerRespondInClosedState(controller: ReadableByteStreamController,\n                                                          firstDescriptor: PullIntoDescriptor) {\n  assert(firstDescriptor.bytesFilled === 0);\n\n  const stream = controller._controlledReadableByteStream;\n  if (ReadableStreamHasBYOBReader(stream)) {\n    while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n      const pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);\n      ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);\n    }\n  }\n}\n\nfunction ReadableByteStreamControllerRespondInReadableState(controller: ReadableByteStreamController,\n                                                            bytesWritten: number,\n                                                            pullIntoDescriptor: PullIntoDescriptor) {\n  assert(pullIntoDescriptor.bytesFilled + bytesWritten <= pullIntoDescriptor.byteLength);\n\n  ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor);\n\n  if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {\n    return;\n  }\n\n  ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n  const remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize;\n  if (remainderSize > 0) {\n    const end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n    const remainder = ArrayBufferSlice(pullIntoDescriptor.buffer, end - remainderSize, end);\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength);\n  }\n\n  pullIntoDescriptor.bytesFilled -= remainderSize;\n  ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);\n\n  ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n}\n\nfunction ReadableByteStreamControllerRespondInternal(controller: ReadableByteStreamController, bytesWritten: number) {\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  assert(CanTransferArrayBuffer(firstDescriptor.buffer));\n\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n\n  const state = controller._controlledReadableByteStream._state;\n  if (state === 'closed') {\n    assert(bytesWritten === 0);\n    ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor);\n  } else {\n    assert(state === 'readable');\n    assert(bytesWritten > 0);\n    ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);\n  }\n\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nfunction ReadableByteStreamControllerShiftPendingPullInto(\n  controller: ReadableByteStreamController\n): PullIntoDescriptor {\n  assert(controller._byobRequest === null);\n  const descriptor = controller._pendingPullIntos.shift()!;\n  return descriptor;\n}\n\nfunction ReadableByteStreamControllerShouldCallPull(controller: ReadableByteStreamController): boolean {\n  const stream = controller._controlledReadableByteStream;\n\n  if (stream._state !== 'readable') {\n    return false;\n  }\n\n  if (controller._closeRequested) {\n    return false;\n  }\n\n  if (!controller._started) {\n    return false;\n  }\n\n  if (ReadableStreamHasDefaultReader(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    return true;\n  }\n\n  if (ReadableStreamHasBYOBReader(stream) && ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n    return true;\n  }\n\n  const desiredSize = ReadableByteStreamControllerGetDesiredSize(controller);\n  assert(desiredSize !== null);\n  if (desiredSize! > 0) {\n    return true;\n  }\n\n  return false;\n}\n\nfunction ReadableByteStreamControllerClearAlgorithms(controller: ReadableByteStreamController) {\n  controller._pullAlgorithm = undefined!;\n  controller._cancelAlgorithm = undefined!;\n}\n\n// A client of ReadableByteStreamController may use these functions directly to bypass state check.\n\nexport function ReadableByteStreamControllerClose(controller: ReadableByteStreamController) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (controller._closeRequested || stream._state !== 'readable') {\n    return;\n  }\n\n  if (controller._queueTotalSize > 0) {\n    controller._closeRequested = true;\n\n    return;\n  }\n\n  if (controller._pendingPullIntos.length > 0) {\n    const firstPendingPullInto = controller._pendingPullIntos.peek();\n    if (firstPendingPullInto.bytesFilled > 0) {\n      const e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n      ReadableByteStreamControllerError(controller, e);\n\n      throw e;\n    }\n  }\n\n  ReadableByteStreamControllerClearAlgorithms(controller);\n  ReadableStreamClose(stream);\n}\n\nexport function ReadableByteStreamControllerEnqueue(controller: ReadableByteStreamController, chunk: ArrayBufferView) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (controller._closeRequested || stream._state !== 'readable') {\n    return;\n  }\n\n  const buffer = chunk.buffer;\n  const byteOffset = chunk.byteOffset;\n  const byteLength = chunk.byteLength;\n  if (IsDetachedBuffer(buffer)) {\n    throw new TypeError('chunk\\'s buffer is detached and so cannot be enqueued');\n  }\n  const transferredBuffer = TransferArrayBuffer(buffer);\n\n  if (controller._pendingPullIntos.length > 0) {\n    const firstPendingPullInto = controller._pendingPullIntos.peek();\n    if (IsDetachedBuffer(firstPendingPullInto.buffer)) {\n      throw new TypeError(\n        'The BYOB request\\'s buffer has been detached and so cannot be filled with an enqueued chunk'\n      );\n    }\n    firstPendingPullInto.buffer = TransferArrayBuffer(firstPendingPullInto.buffer);\n  }\n\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n\n  if (ReadableStreamHasDefaultReader(stream)) {\n    if (ReadableStreamGetNumReadRequests(stream) === 0) {\n      assert(controller._pendingPullIntos.length === 0);\n      ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n    } else {\n      assert(controller._queue.length === 0);\n      if (controller._pendingPullIntos.length > 0) {\n        assert(controller._pendingPullIntos.peek().readerType === 'default');\n        ReadableByteStreamControllerShiftPendingPullInto(controller);\n      }\n      const transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength);\n      ReadableStreamFulfillReadRequest(stream, transferredView, false);\n    }\n  } else if (ReadableStreamHasBYOBReader(stream)) {\n    // TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully.\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n    ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n  } else {\n    assert(!IsReadableStreamLocked(stream));\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n  }\n\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nexport function ReadableByteStreamControllerError(controller: ReadableByteStreamController, e: any) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (stream._state !== 'readable') {\n    return;\n  }\n\n  ReadableByteStreamControllerClearPendingPullIntos(controller);\n\n  ResetQueue(controller);\n  ReadableByteStreamControllerClearAlgorithms(controller);\n  ReadableStreamError(stream, e);\n}\n\nexport function ReadableByteStreamControllerGetBYOBRequest(\n  controller: ReadableByteStreamController\n): ReadableStreamBYOBRequest | null {\n  if (controller._byobRequest === null && controller._pendingPullIntos.length > 0) {\n    const firstDescriptor = controller._pendingPullIntos.peek();\n    const view = new Uint8Array(firstDescriptor.buffer,\n                                firstDescriptor.byteOffset + firstDescriptor.bytesFilled,\n                                firstDescriptor.byteLength - firstDescriptor.bytesFilled);\n\n    const byobRequest: ReadableStreamBYOBRequest = Object.create(ReadableStreamBYOBRequest.prototype);\n    SetUpReadableStreamBYOBRequest(byobRequest, controller, view);\n    controller._byobRequest = byobRequest;\n  }\n  return controller._byobRequest;\n}\n\nfunction ReadableByteStreamControllerGetDesiredSize(controller: ReadableByteStreamController): number | null {\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'errored') {\n    return null;\n  }\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\nexport function ReadableByteStreamControllerRespond(controller: ReadableByteStreamController, bytesWritten: number) {\n  assert(controller._pendingPullIntos.length > 0);\n\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'closed') {\n    if (bytesWritten !== 0) {\n      throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream');\n    }\n  } else {\n    assert(state === 'readable');\n    if (bytesWritten === 0) {\n      throw new TypeError('bytesWritten must be greater than 0 when calling respond() on a readable stream');\n    }\n    if (firstDescriptor.bytesFilled + bytesWritten > firstDescriptor.byteLength) {\n      throw new RangeError('bytesWritten out of range');\n    }\n  }\n\n  firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer);\n\n  ReadableByteStreamControllerRespondInternal(controller, bytesWritten);\n}\n\nexport function ReadableByteStreamControllerRespondWithNewView(controller: ReadableByteStreamController,\n                                                               view: ArrayBufferView) {\n  assert(controller._pendingPullIntos.length > 0);\n  assert(!IsDetachedBuffer(view.buffer));\n\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'closed') {\n    if (view.byteLength !== 0) {\n      throw new TypeError('The view\\'s length must be 0 when calling respondWithNewView() on a closed stream');\n    }\n  } else {\n    assert(state === 'readable');\n    if (view.byteLength === 0) {\n      throw new TypeError(\n        'The view\\'s length must be greater than 0 when calling respondWithNewView() on a readable stream'\n      );\n    }\n  }\n\n  if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) {\n    throw new RangeError('The region specified by view does not match byobRequest');\n  }\n  if (firstDescriptor.bufferByteLength !== view.buffer.byteLength) {\n    throw new RangeError('The buffer of view has different capacity than byobRequest');\n  }\n  if (firstDescriptor.bytesFilled + view.byteLength > firstDescriptor.byteLength) {\n    throw new RangeError('The region specified by view is larger than byobRequest');\n  }\n\n  const viewByteLength = view.byteLength;\n  firstDescriptor.buffer = TransferArrayBuffer(view.buffer);\n  ReadableByteStreamControllerRespondInternal(controller, viewByteLength);\n}\n\nexport function SetUpReadableByteStreamController(stream: ReadableByteStream,\n                                                  controller: ReadableByteStreamController,\n                                                  startAlgorithm: () => void | PromiseLike<void>,\n                                                  pullAlgorithm: () => Promise<void>,\n                                                  cancelAlgorithm: (reason: any) => Promise<void>,\n                                                  highWaterMark: number,\n                                                  autoAllocateChunkSize: number | undefined) {\n  assert(stream._readableStreamController === undefined);\n  if (autoAllocateChunkSize !== undefined) {\n    assert(NumberIsInteger(autoAllocateChunkSize));\n    assert(autoAllocateChunkSize > 0);\n  }\n\n  controller._controlledReadableByteStream = stream;\n\n  controller._pullAgain = false;\n  controller._pulling = false;\n\n  controller._byobRequest = null;\n\n  // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n  controller._queue = controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._closeRequested = false;\n  controller._started = false;\n\n  controller._strategyHWM = highWaterMark;\n\n  controller._pullAlgorithm = pullAlgorithm;\n  controller._cancelAlgorithm = cancelAlgorithm;\n\n  controller._autoAllocateChunkSize = autoAllocateChunkSize;\n\n  controller._pendingPullIntos = new SimpleQueue();\n\n  stream._readableStreamController = controller;\n\n  const startResult = startAlgorithm();\n  uponPromise(\n    promiseResolvedWith(startResult),\n    () => {\n      controller._started = true;\n\n      assert(!controller._pulling);\n      assert(!controller._pullAgain);\n\n      ReadableByteStreamControllerCallPullIfNeeded(controller);\n    },\n    r => {\n      ReadableByteStreamControllerError(controller, r);\n    }\n  );\n}\n\nexport function SetUpReadableByteStreamControllerFromUnderlyingSource(\n  stream: ReadableByteStream,\n  underlyingByteSource: ValidatedUnderlyingByteSource,\n  highWaterMark: number\n) {\n  const controller: ReadableByteStreamController = Object.create(ReadableByteStreamController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let pullAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let cancelAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingByteSource.start !== undefined) {\n    startAlgorithm = () => underlyingByteSource.start!(controller);\n  }\n  if (underlyingByteSource.pull !== undefined) {\n    pullAlgorithm = () => underlyingByteSource.pull!(controller);\n  }\n  if (underlyingByteSource.cancel !== undefined) {\n    cancelAlgorithm = reason => underlyingByteSource.cancel!(reason);\n  }\n\n  const autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;\n  if (autoAllocateChunkSize === 0) {\n    throw new TypeError('autoAllocateChunkSize must be greater than 0');\n  }\n\n  SetUpReadableByteStreamController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize\n  );\n}\n\nfunction SetUpReadableStreamBYOBRequest(request: ReadableStreamBYOBRequest,\n                                        controller: ReadableByteStreamController,\n                                        view: ArrayBufferView) {\n  assert(IsReadableByteStreamController(controller));\n  assert(typeof view === 'object');\n  assert(ArrayBuffer.isView(view));\n  assert(!IsDetachedBuffer(view.buffer));\n  request._associatedReadableByteStreamController = controller;\n  request._view = view;\n}\n\n// Helper functions for the ReadableStreamBYOBRequest.\n\nfunction byobRequestBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamBYOBRequest.prototype.${name} can only be used on a ReadableStreamBYOBRequest`);\n}\n\n// Helper functions for the ReadableByteStreamController.\n\nfunction byteStreamControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableByteStreamController.prototype.${name} can only be used on a ReadableByteStreamController`);\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericInitialize,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport { IsReadableStreamLocked, ReadableByteStream, ReadableStream } from '../readable-stream';\nimport {\n  IsReadableByteStreamController,\n  ReadableByteStreamController,\n  ReadableByteStreamControllerPullInto\n} from './byte-stream-controller';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { newPromise, promiseRejectedWith } from '../helpers/webidl';\nimport { assertRequiredArgument } from '../validators/basic';\nimport { assertReadableStream } from '../validators/readable-stream';\nimport { IsDetachedBuffer } from '../abstract-ops/ecmascript';\n\n/**\n * A result returned by {@link ReadableStreamBYOBReader.read}.\n *\n * @public\n */\nexport type ReadableStreamBYOBReadResult<T extends ArrayBufferView> = {\n  done: false;\n  value: T;\n} | {\n  done: true;\n  value: T | undefined;\n};\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamBYOBReader(stream: ReadableByteStream): ReadableStreamBYOBReader {\n  return new ReadableStreamBYOBReader(stream);\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamAddReadIntoRequest<T extends ArrayBufferView>(stream: ReadableByteStream,\n                                                                            readIntoRequest: ReadIntoRequest<T>): void {\n  assert(IsReadableStreamBYOBReader(stream._reader));\n  assert(stream._state === 'readable' || stream._state === 'closed');\n\n  (stream._reader! as ReadableStreamBYOBReader)._readIntoRequests.push(readIntoRequest);\n}\n\nexport function ReadableStreamFulfillReadIntoRequest(stream: ReadableByteStream,\n                                                     chunk: ArrayBufferView,\n                                                     done: boolean) {\n  const reader = stream._reader as ReadableStreamBYOBReader;\n\n  assert(reader._readIntoRequests.length > 0);\n\n  const readIntoRequest = reader._readIntoRequests.shift()!;\n  if (done) {\n    readIntoRequest._closeSteps(chunk);\n  } else {\n    readIntoRequest._chunkSteps(chunk);\n  }\n}\n\nexport function ReadableStreamGetNumReadIntoRequests(stream: ReadableByteStream): number {\n  return (stream._reader as ReadableStreamBYOBReader)._readIntoRequests.length;\n}\n\nexport function ReadableStreamHasBYOBReader(stream: ReadableByteStream): boolean {\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return false;\n  }\n\n  if (!IsReadableStreamBYOBReader(reader)) {\n    return false;\n  }\n\n  return true;\n}\n\n// Readers\n\nexport interface ReadIntoRequest<T extends ArrayBufferView> {\n  _chunkSteps(chunk: T): void;\n\n  _closeSteps(chunk: T | undefined): void;\n\n  _errorSteps(e: any): void;\n}\n\n/**\n * A BYOB reader vended by a {@link ReadableStream}.\n *\n * @public\n */\nexport class ReadableStreamBYOBReader {\n  /** @internal */\n  _ownerReadableStream!: ReadableByteStream;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readIntoRequests: SimpleQueue<ReadIntoRequest<any>>;\n\n  constructor(stream: ReadableByteStream) {\n    assertRequiredArgument(stream, 1, 'ReadableStreamBYOBReader');\n    assertReadableStream(stream, 'First parameter');\n\n    if (IsReadableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n    }\n\n    if (!IsReadableByteStreamController(stream._readableStreamController)) {\n      throw new TypeError('Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte ' +\n        'source');\n    }\n\n    ReadableStreamReaderGenericInitialize(this, stream);\n\n    this._readIntoRequests = new SimpleQueue();\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or\n   * the reader's lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('cancel'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('cancel'));\n    }\n\n    return ReadableStreamReaderGenericCancel(this, reason);\n  }\n\n  /**\n   * Attempts to reads bytes into view, and returns a promise resolved with the result.\n   *\n   * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.\n   */\n  read<T extends ArrayBufferView>(view: T): Promise<ReadableStreamBYOBReadResult<T>> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('read'));\n    }\n\n    if (!ArrayBuffer.isView(view)) {\n      return promiseRejectedWith(new TypeError('view must be an array buffer view'));\n    }\n    if (view.byteLength === 0) {\n      return promiseRejectedWith(new TypeError('view must have non-zero byteLength'));\n    }\n    if (view.buffer.byteLength === 0) {\n      return promiseRejectedWith(new TypeError(`view's buffer must have non-zero byteLength`));\n    }\n    if (IsDetachedBuffer(view.buffer)) {\n      return promiseRejectedWith(new TypeError('view\\'s buffer has been detached'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('read from'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamBYOBReadResult<T>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamBYOBReadResult<T>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readIntoRequest: ReadIntoRequest<T> = {\n      _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),\n      _closeSteps: chunk => resolvePromise({ value: chunk, done: true }),\n      _errorSteps: e => rejectPromise(e)\n    };\n    ReadableStreamBYOBReaderRead(this, view, readIntoRequest);\n    return promise;\n  }\n\n  /**\n   * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.\n   * If the associated stream is errored when the lock is released, the reader will appear errored in the same way\n   * from now on; otherwise, the reader will appear closed.\n   *\n   * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by\n   * the reader's {@link ReadableStreamBYOBReader.read | read()} method has not yet been settled. Attempting to\n   * do so will throw a `TypeError` and leave the reader locked to the stream.\n   */\n  releaseLock(): void {\n    if (!IsReadableStreamBYOBReader(this)) {\n      throw byobReaderBrandCheckException('releaseLock');\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return;\n    }\n\n    if (this._readIntoRequests.length > 0) {\n      throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n    }\n\n    ReadableStreamReaderGenericRelease(this);\n  }\n}\n\nObject.defineProperties(ReadableStreamBYOBReader.prototype, {\n  cancel: { enumerable: true },\n  read: { enumerable: true },\n  releaseLock: { enumerable: true },\n  closed: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamBYOBReader.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamBYOBReader',\n    configurable: true\n  });\n}\n\n// Abstract operations for the readers.\n\nexport function IsReadableStreamBYOBReader(x: any): x is ReadableStreamBYOBReader {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readIntoRequests')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamBYOBReader;\n}\n\nexport function ReadableStreamBYOBReaderRead<T extends ArrayBufferView>(\n  reader: ReadableStreamBYOBReader,\n  view: T,\n  readIntoRequest: ReadIntoRequest<T>\n): void {\n  const stream = reader._ownerReadableStream;\n\n  assert(stream !== undefined);\n\n  stream._disturbed = true;\n\n  if (stream._state === 'errored') {\n    readIntoRequest._errorSteps(stream._storedError);\n  } else {\n    ReadableByteStreamControllerPullInto(\n      stream._readableStreamController as ReadableByteStreamController,\n      view,\n      readIntoRequest\n    );\n  }\n}\n\n// Helper functions for the ReadableStreamBYOBReader.\n\nfunction byobReaderBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamBYOBReader.prototype.${name} can only be used on a ReadableStreamBYOBReader`);\n}\n","import { QueuingStrategy, QueuingStrategySizeCallback } from '../queuing-strategy';\nimport NumberIsNaN from '../../stub/number-isnan';\n\nexport function ExtractHighWaterMark(strategy: QueuingStrategy, defaultHWM: number): number {\n  const { highWaterMark } = strategy;\n\n  if (highWaterMark === undefined) {\n    return defaultHWM;\n  }\n\n  if (NumberIsNaN(highWaterMark) || highWaterMark < 0) {\n    throw new RangeError('Invalid highWaterMark');\n  }\n\n  return highWaterMark;\n}\n\nexport function ExtractSizeAlgorithm<T>(strategy: QueuingStrategy<T>): QueuingStrategySizeCallback<T> {\n  const { size } = strategy;\n\n  if (!size) {\n    return () => 1;\n  }\n\n  return size;\n}\n","import { QueuingStrategy, QueuingStrategySizeCallback } from '../queuing-strategy';\nimport { assertDictionary, assertFunction, convertUnrestrictedDouble } from './basic';\n\nexport function convertQueuingStrategy<T>(init: QueuingStrategy<T> | null | undefined,\n                                          context: string): QueuingStrategy<T> {\n  assertDictionary(init, context);\n  const highWaterMark = init?.highWaterMark;\n  const size = init?.size;\n  return {\n    highWaterMark: highWaterMark === undefined ? undefined : convertUnrestrictedDouble(highWaterMark),\n    size: size === undefined ? undefined : convertQueuingStrategySize(size, `${context} has member 'size' that`)\n  };\n}\n\nfunction convertQueuingStrategySize<T>(fn: QueuingStrategySizeCallback<T>,\n                                       context: string): QueuingStrategySizeCallback<T> {\n  assertFunction(fn, context);\n  return chunk => convertUnrestrictedDouble(fn(chunk));\n}\n","import { assertDictionary, assertFunction } from './basic';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\nimport {\n  UnderlyingSink,\n  UnderlyingSinkAbortCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  ValidatedUnderlyingSink\n} from '../writable-stream/underlying-sink';\nimport { WritableStreamDefaultController } from '../writable-stream';\n\nexport function convertUnderlyingSink<W>(original: UnderlyingSink<W> | null,\n                                         context: string): ValidatedUnderlyingSink<W> {\n  assertDictionary(original, context);\n  const abort = original?.abort;\n  const close = original?.close;\n  const start = original?.start;\n  const type = original?.type;\n  const write = original?.write;\n  return {\n    abort: abort === undefined ?\n      undefined :\n      convertUnderlyingSinkAbortCallback(abort, original!, `${context} has member 'abort' that`),\n    close: close === undefined ?\n      undefined :\n      convertUnderlyingSinkCloseCallback(close, original!, `${context} has member 'close' that`),\n    start: start === undefined ?\n      undefined :\n      convertUnderlyingSinkStartCallback(start, original!, `${context} has member 'start' that`),\n    write: write === undefined ?\n      undefined :\n      convertUnderlyingSinkWriteCallback(write, original!, `${context} has member 'write' that`),\n    type\n  };\n}\n\nfunction convertUnderlyingSinkAbortCallback(\n  fn: UnderlyingSinkAbortCallback,\n  original: UnderlyingSink,\n  context: string\n): (reason: any) => Promise<void> {\n  assertFunction(fn, context);\n  return (reason: any) => promiseCall(fn, original, [reason]);\n}\n\nfunction convertUnderlyingSinkCloseCallback(\n  fn: UnderlyingSinkCloseCallback,\n  original: UnderlyingSink,\n  context: string\n): () => Promise<void> {\n  assertFunction(fn, context);\n  return () => promiseCall(fn, original, []);\n}\n\nfunction convertUnderlyingSinkStartCallback(\n  fn: UnderlyingSinkStartCallback,\n  original: UnderlyingSink,\n  context: string\n): UnderlyingSinkStartCallback {\n  assertFunction(fn, context);\n  return (controller: WritableStreamDefaultController) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertUnderlyingSinkWriteCallback<W>(\n  fn: UnderlyingSinkWriteCallback<W>,\n  original: UnderlyingSink<W>,\n  context: string\n): (chunk: W, controller: WritableStreamDefaultController) => Promise<void> {\n  assertFunction(fn, context);\n  return (chunk: W, controller: WritableStreamDefaultController) => promiseCall(fn, original, [chunk, controller]);\n}\n","import { IsWritableStream, WritableStream } from '../writable-stream';\n\nexport function assertWritableStream(x: unknown, context: string): asserts x is WritableStream {\n  if (!IsWritableStream(x)) {\n    throw new TypeError(`${context} is not a WritableStream.`);\n  }\n}\n","/**\n * A signal object that allows you to communicate with a request and abort it if required\n * via its associated `AbortController` object.\n *\n * @remarks\n *   This interface is compatible with the `AbortSignal` interface defined in TypeScript's DOM types.\n *   It is redefined here, so it can be polyfilled without a DOM, for example with\n *   {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.\n *\n * @public\n */\nexport interface AbortSignal {\n  /**\n   * Whether the request is aborted.\n   */\n  readonly aborted: boolean;\n\n  /**\n   * Add an event listener to be triggered when this signal becomes aborted.\n   */\n  addEventListener(type: 'abort', listener: () => void): void;\n\n  /**\n   * Remove an event listener that was previously added with {@link AbortSignal.addEventListener}.\n   */\n  removeEventListener(type: 'abort', listener: () => void): void;\n}\n\nexport function isAbortSignal(value: unknown): value is AbortSignal {\n  if (typeof value !== 'object' || value === null) {\n    return false;\n  }\n  try {\n    return typeof (value as AbortSignal).aborted === 'boolean';\n  } catch {\n    // AbortSignal.prototype.aborted throws if its brand check fails\n    return false;\n  }\n}\n\n/**\n * A controller object that allows you to abort an `AbortSignal` when desired.\n *\n * @remarks\n *   This interface is compatible with the `AbortController` interface defined in TypeScript's DOM types.\n *   It is redefined here, so it can be polyfilled without a DOM, for example with\n *   {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.\n *\n * @internal\n */\nexport interface AbortController {\n  readonly signal: AbortSignal;\n\n  abort(): void;\n}\n\ninterface AbortControllerConstructor {\n  new(): AbortController;\n}\n\nconst supportsAbortController = typeof (AbortController as any) === 'function';\n\n/**\n * Construct a new AbortController, if supported by the platform.\n *\n * @internal\n */\nexport function createAbortController(): AbortController | undefined {\n  if (supportsAbortController) {\n    return new (AbortController as AbortControllerConstructor)();\n  }\n  return undefined;\n}\n","import assert from '../stub/assert';\nimport {\n  newPromise,\n  promiseRejectedWith,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  uponPromise\n} from './helpers/webidl';\nimport {\n  DequeueValue,\n  EnqueueValueWithSize,\n  PeekQueueValue,\n  QueuePair,\n  ResetQueue\n} from './abstract-ops/queue-with-sizes';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { SimpleQueue } from './simple-queue';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { AbortSteps, ErrorSteps } from './abstract-ops/internal-methods';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport {\n  UnderlyingSink,\n  UnderlyingSinkAbortCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  ValidatedUnderlyingSink\n} from './writable-stream/underlying-sink';\nimport { assertObject, assertRequiredArgument } from './validators/basic';\nimport { convertUnderlyingSink } from './validators/underlying-sink';\nimport { assertWritableStream } from './validators/writable-stream';\nimport { AbortController, AbortSignal, createAbortController } from './abort-signal';\n\ntype WritableStreamState = 'writable' | 'closed' | 'erroring' | 'errored';\n\ninterface WriteOrCloseRequest {\n  _resolve: (value?: undefined) => void;\n  _reject: (reason: any) => void;\n}\n\ntype WriteRequest = WriteOrCloseRequest;\ntype CloseRequest = WriteOrCloseRequest;\n\ninterface PendingAbortRequest {\n  _promise: Promise<undefined>;\n  _resolve: (value?: undefined) => void;\n  _reject: (reason: any) => void;\n  _reason: any;\n  _wasAlreadyErroring: boolean;\n}\n\n/**\n * A writable stream represents a destination for data, into which you can write.\n *\n * @public\n */\nclass WritableStream<W = any> {\n  /** @internal */\n  _state!: WritableStreamState;\n  /** @internal */\n  _storedError: any;\n  /** @internal */\n  _writer: WritableStreamDefaultWriter<W> | undefined;\n  /** @internal */\n  _writableStreamController!: WritableStreamDefaultController<W>;\n  /** @internal */\n  _writeRequests!: SimpleQueue<WriteRequest>;\n  /** @internal */\n  _inFlightWriteRequest: WriteRequest | undefined;\n  /** @internal */\n  _closeRequest: CloseRequest | undefined;\n  /** @internal */\n  _inFlightCloseRequest: CloseRequest | undefined;\n  /** @internal */\n  _pendingAbortRequest: PendingAbortRequest | undefined;\n  /** @internal */\n  _backpressure!: boolean;\n\n  constructor(underlyingSink?: UnderlyingSink<W>, strategy?: QueuingStrategy<W>);\n  constructor(rawUnderlyingSink: UnderlyingSink<W> | null | undefined = {},\n              rawStrategy: QueuingStrategy<W> | null | undefined = {}) {\n    if (rawUnderlyingSink === undefined) {\n      rawUnderlyingSink = null;\n    } else {\n      assertObject(rawUnderlyingSink, 'First parameter');\n    }\n\n    const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');\n    const underlyingSink = convertUnderlyingSink(rawUnderlyingSink, 'First parameter');\n\n    InitializeWritableStream(this);\n\n    const type = underlyingSink.type;\n    if (type !== undefined) {\n      throw new RangeError('Invalid type is specified');\n    }\n\n    const sizeAlgorithm = ExtractSizeAlgorithm(strategy);\n    const highWaterMark = ExtractHighWaterMark(strategy, 1);\n\n    SetUpWritableStreamDefaultControllerFromUnderlyingSink(this, underlyingSink, highWaterMark, sizeAlgorithm);\n  }\n\n  /**\n   * Returns whether or not the writable stream is locked to a writer.\n   */\n  get locked(): boolean {\n    if (!IsWritableStream(this)) {\n      throw streamBrandCheckException('locked');\n    }\n\n    return IsWritableStreamLocked(this);\n  }\n\n  /**\n   * Aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be\n   * immediately moved to an errored state, with any queued-up writes discarded. This will also execute any abort\n   * mechanism of the underlying sink.\n   *\n   * The returned promise will fulfill if the stream shuts down successfully, or reject if the underlying sink signaled\n   * that there was an error doing so. Additionally, it will reject with a `TypeError` (without attempting to cancel\n   * the stream) if the stream is currently locked.\n   */\n  abort(reason: any = undefined): Promise<void> {\n    if (!IsWritableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('abort'));\n    }\n\n    if (IsWritableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot abort a stream that already has a writer'));\n    }\n\n    return WritableStreamAbort(this, reason);\n  }\n\n  /**\n   * Closes the stream. The underlying sink will finish processing any previously-written chunks, before invoking its\n   * close behavior. During this time any further attempts to write will fail (without erroring the stream).\n   *\n   * The method returns a promise that will fulfill if all remaining chunks are successfully written and the stream\n   * successfully closes, or rejects if an error is encountered during this process. Additionally, it will reject with\n   * a `TypeError` (without attempting to cancel the stream) if the stream is currently locked.\n   */\n  close() {\n    if (!IsWritableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('close'));\n    }\n\n    if (IsWritableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot close a stream that already has a writer'));\n    }\n\n    if (WritableStreamCloseQueuedOrInFlight(this)) {\n      return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));\n    }\n\n    return WritableStreamClose(this);\n  }\n\n  /**\n   * Creates a {@link WritableStreamDefaultWriter | writer} and locks the stream to the new writer. While the stream\n   * is locked, no other writer can be acquired until this one is released.\n   *\n   * This functionality is especially useful for creating abstractions that desire the ability to write to a stream\n   * without interruption or interleaving. By getting a writer for the stream, you can ensure nobody else can write at\n   * the same time, which would cause the resulting written data to be unpredictable and probably useless.\n   */\n  getWriter(): WritableStreamDefaultWriter<W> {\n    if (!IsWritableStream(this)) {\n      throw streamBrandCheckException('getWriter');\n    }\n\n    return AcquireWritableStreamDefaultWriter(this);\n  }\n}\n\nObject.defineProperties(WritableStream.prototype, {\n  abort: { enumerable: true },\n  close: { enumerable: true },\n  getWriter: { enumerable: true },\n  locked: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStream.prototype, Symbol.toStringTag, {\n    value: 'WritableStream',\n    configurable: true\n  });\n}\n\nexport {\n  AcquireWritableStreamDefaultWriter,\n  CreateWritableStream,\n  IsWritableStream,\n  IsWritableStreamLocked,\n  WritableStream,\n  WritableStreamAbort,\n  WritableStreamDefaultControllerErrorIfNeeded,\n  WritableStreamDefaultWriterCloseWithErrorPropagation,\n  WritableStreamDefaultWriterRelease,\n  WritableStreamDefaultWriterWrite,\n  WritableStreamCloseQueuedOrInFlight,\n  UnderlyingSink,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkAbortCallback\n};\n\n// Abstract operations for the WritableStream.\n\nfunction AcquireWritableStreamDefaultWriter<W>(stream: WritableStream<W>): WritableStreamDefaultWriter<W> {\n  return new WritableStreamDefaultWriter(stream);\n}\n\n// Throws if and only if startAlgorithm throws.\nfunction CreateWritableStream<W>(startAlgorithm: () => void | PromiseLike<void>,\n                                 writeAlgorithm: (chunk: W) => Promise<void>,\n                                 closeAlgorithm: () => Promise<void>,\n                                 abortAlgorithm: (reason: any) => Promise<void>,\n                                 highWaterMark = 1,\n                                 sizeAlgorithm: QueuingStrategySizeCallback<W> = () => 1) {\n  assert(IsNonNegativeNumber(highWaterMark));\n\n  const stream: WritableStream<W> = Object.create(WritableStream.prototype);\n  InitializeWritableStream(stream);\n\n  const controller: WritableStreamDefaultController<W> = Object.create(WritableStreamDefaultController.prototype);\n\n  SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm,\n                                       abortAlgorithm, highWaterMark, sizeAlgorithm);\n  return stream;\n}\n\nfunction InitializeWritableStream<W>(stream: WritableStream<W>) {\n  stream._state = 'writable';\n\n  // The error that will be reported by new method calls once the state becomes errored. Only set when [[state]] is\n  // 'erroring' or 'errored'. May be set to an undefined value.\n  stream._storedError = undefined;\n\n  stream._writer = undefined;\n\n  // Initialize to undefined first because the constructor of the controller checks this\n  // variable to validate the caller.\n  stream._writableStreamController = undefined!;\n\n  // This queue is placed here instead of the writer class in order to allow for passing a writer to the next data\n  // producer without waiting for the queued writes to finish.\n  stream._writeRequests = new SimpleQueue();\n\n  // Write requests are removed from _writeRequests when write() is called on the underlying sink. This prevents\n  // them from being erroneously rejected on error. If a write() call is in-flight, the request is stored here.\n  stream._inFlightWriteRequest = undefined;\n\n  // The promise that was returned from writer.close(). Stored here because it may be fulfilled after the writer\n  // has been detached.\n  stream._closeRequest = undefined;\n\n  // Close request is removed from _closeRequest when close() is called on the underlying sink. This prevents it\n  // from being erroneously rejected on error. If a close() call is in-flight, the request is stored here.\n  stream._inFlightCloseRequest = undefined;\n\n  // The promise that was returned from writer.abort(). This may also be fulfilled after the writer has detached.\n  stream._pendingAbortRequest = undefined;\n\n  // The backpressure signal set by the controller.\n  stream._backpressure = false;\n}\n\nfunction IsWritableStream(x: unknown): x is WritableStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_writableStreamController')) {\n    return false;\n  }\n\n  return x instanceof WritableStream;\n}\n\nfunction IsWritableStreamLocked(stream: WritableStream): boolean {\n  assert(IsWritableStream(stream));\n\n  if (stream._writer === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamAbort(stream: WritableStream, reason: any): Promise<undefined> {\n  if (stream._state === 'closed' || stream._state === 'errored') {\n    return promiseResolvedWith(undefined);\n  }\n  stream._writableStreamController._abortReason = reason;\n  stream._writableStreamController._abortController?.abort();\n\n  // TypeScript narrows the type of `stream._state` down to 'writable' | 'erroring',\n  // but it doesn't know that signaling abort runs author code that might have changed the state.\n  // Widen the type again by casting to WritableStreamState.\n  const state = stream._state as WritableStreamState;\n\n  if (state === 'closed' || state === 'errored') {\n    return promiseResolvedWith(undefined);\n  }\n  if (stream._pendingAbortRequest !== undefined) {\n    return stream._pendingAbortRequest._promise;\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n\n  let wasAlreadyErroring = false;\n  if (state === 'erroring') {\n    wasAlreadyErroring = true;\n    // reason will not be used, so don't keep a reference to it.\n    reason = undefined;\n  }\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    stream._pendingAbortRequest = {\n      _promise: undefined!,\n      _resolve: resolve,\n      _reject: reject,\n      _reason: reason,\n      _wasAlreadyErroring: wasAlreadyErroring\n    };\n  });\n  stream._pendingAbortRequest!._promise = promise;\n\n  if (!wasAlreadyErroring) {\n    WritableStreamStartErroring(stream, reason);\n  }\n\n  return promise;\n}\n\nfunction WritableStreamClose(stream: WritableStream<any>): Promise<undefined> {\n  const state = stream._state;\n  if (state === 'closed' || state === 'errored') {\n    return promiseRejectedWith(new TypeError(\n      `The stream (in ${state} state) is not in the writable state and cannot be closed`));\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n  assert(!WritableStreamCloseQueuedOrInFlight(stream));\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    const closeRequest: CloseRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._closeRequest = closeRequest;\n  });\n\n  const writer = stream._writer;\n  if (writer !== undefined && stream._backpressure && state === 'writable') {\n    defaultWriterReadyPromiseResolve(writer);\n  }\n\n  WritableStreamDefaultControllerClose(stream._writableStreamController);\n\n  return promise;\n}\n\n// WritableStream API exposed for controllers.\n\nfunction WritableStreamAddWriteRequest(stream: WritableStream): Promise<undefined> {\n  assert(IsWritableStreamLocked(stream));\n  assert(stream._state === 'writable');\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    const writeRequest: WriteRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._writeRequests.push(writeRequest);\n  });\n\n  return promise;\n}\n\nfunction WritableStreamDealWithRejection(stream: WritableStream, error: any) {\n  const state = stream._state;\n\n  if (state === 'writable') {\n    WritableStreamStartErroring(stream, error);\n    return;\n  }\n\n  assert(state === 'erroring');\n  WritableStreamFinishErroring(stream);\n}\n\nfunction WritableStreamStartErroring(stream: WritableStream, reason: any) {\n  assert(stream._storedError === undefined);\n  assert(stream._state === 'writable');\n\n  const controller = stream._writableStreamController;\n  assert(controller !== undefined);\n\n  stream._state = 'erroring';\n  stream._storedError = reason;\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);\n  }\n\n  if (!WritableStreamHasOperationMarkedInFlight(stream) && controller._started) {\n    WritableStreamFinishErroring(stream);\n  }\n}\n\nfunction WritableStreamFinishErroring(stream: WritableStream) {\n  assert(stream._state === 'erroring');\n  assert(!WritableStreamHasOperationMarkedInFlight(stream));\n  stream._state = 'errored';\n  stream._writableStreamController[ErrorSteps]();\n\n  const storedError = stream._storedError;\n  stream._writeRequests.forEach(writeRequest => {\n    writeRequest._reject(storedError);\n  });\n  stream._writeRequests = new SimpleQueue();\n\n  if (stream._pendingAbortRequest === undefined) {\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    return;\n  }\n\n  const abortRequest = stream._pendingAbortRequest;\n  stream._pendingAbortRequest = undefined;\n\n  if (abortRequest._wasAlreadyErroring) {\n    abortRequest._reject(storedError);\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    return;\n  }\n\n  const promise = stream._writableStreamController[AbortSteps](abortRequest._reason);\n  uponPromise(\n    promise,\n    () => {\n      abortRequest._resolve();\n      WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    },\n    (reason: any) => {\n      abortRequest._reject(reason);\n      WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    });\n}\n\nfunction WritableStreamFinishInFlightWrite(stream: WritableStream) {\n  assert(stream._inFlightWriteRequest !== undefined);\n  stream._inFlightWriteRequest!._resolve(undefined);\n  stream._inFlightWriteRequest = undefined;\n}\n\nfunction WritableStreamFinishInFlightWriteWithError(stream: WritableStream, error: any) {\n  assert(stream._inFlightWriteRequest !== undefined);\n  stream._inFlightWriteRequest!._reject(error);\n  stream._inFlightWriteRequest = undefined;\n\n  assert(stream._state === 'writable' || stream._state === 'erroring');\n\n  WritableStreamDealWithRejection(stream, error);\n}\n\nfunction WritableStreamFinishInFlightClose(stream: WritableStream) {\n  assert(stream._inFlightCloseRequest !== undefined);\n  stream._inFlightCloseRequest!._resolve(undefined);\n  stream._inFlightCloseRequest = undefined;\n\n  const state = stream._state;\n\n  assert(state === 'writable' || state === 'erroring');\n\n  if (state === 'erroring') {\n    // The error was too late to do anything, so it is ignored.\n    stream._storedError = undefined;\n    if (stream._pendingAbortRequest !== undefined) {\n      stream._pendingAbortRequest._resolve();\n      stream._pendingAbortRequest = undefined;\n    }\n  }\n\n  stream._state = 'closed';\n\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    defaultWriterClosedPromiseResolve(writer);\n  }\n\n  assert(stream._pendingAbortRequest === undefined);\n  assert(stream._storedError === undefined);\n}\n\nfunction WritableStreamFinishInFlightCloseWithError(stream: WritableStream, error: any) {\n  assert(stream._inFlightCloseRequest !== undefined);\n  stream._inFlightCloseRequest!._reject(error);\n  stream._inFlightCloseRequest = undefined;\n\n  assert(stream._state === 'writable' || stream._state === 'erroring');\n\n  // Never execute sink abort() after sink close().\n  if (stream._pendingAbortRequest !== undefined) {\n    stream._pendingAbortRequest._reject(error);\n    stream._pendingAbortRequest = undefined;\n  }\n  WritableStreamDealWithRejection(stream, error);\n}\n\n// TODO(ricea): Fix alphabetical order.\nfunction WritableStreamCloseQueuedOrInFlight(stream: WritableStream): boolean {\n  if (stream._closeRequest === undefined && stream._inFlightCloseRequest === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamHasOperationMarkedInFlight(stream: WritableStream): boolean {\n  if (stream._inFlightWriteRequest === undefined && stream._inFlightCloseRequest === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamMarkCloseRequestInFlight(stream: WritableStream) {\n  assert(stream._inFlightCloseRequest === undefined);\n  assert(stream._closeRequest !== undefined);\n  stream._inFlightCloseRequest = stream._closeRequest;\n  stream._closeRequest = undefined;\n}\n\nfunction WritableStreamMarkFirstWriteRequestInFlight(stream: WritableStream) {\n  assert(stream._inFlightWriteRequest === undefined);\n  assert(stream._writeRequests.length !== 0);\n  stream._inFlightWriteRequest = stream._writeRequests.shift();\n}\n\nfunction WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream: WritableStream) {\n  assert(stream._state === 'errored');\n  if (stream._closeRequest !== undefined) {\n    assert(stream._inFlightCloseRequest === undefined);\n\n    stream._closeRequest._reject(stream._storedError);\n    stream._closeRequest = undefined;\n  }\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    defaultWriterClosedPromiseReject(writer, stream._storedError);\n  }\n}\n\nfunction WritableStreamUpdateBackpressure(stream: WritableStream, backpressure: boolean) {\n  assert(stream._state === 'writable');\n  assert(!WritableStreamCloseQueuedOrInFlight(stream));\n\n  const writer = stream._writer;\n  if (writer !== undefined && backpressure !== stream._backpressure) {\n    if (backpressure) {\n      defaultWriterReadyPromiseReset(writer);\n    } else {\n      assert(!backpressure);\n\n      defaultWriterReadyPromiseResolve(writer);\n    }\n  }\n\n  stream._backpressure = backpressure;\n}\n\n/**\n * A default writer vended by a {@link WritableStream}.\n *\n * @public\n */\nexport class WritableStreamDefaultWriter<W = any> {\n  /** @internal */\n  _ownerWritableStream: WritableStream<W>;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _closedPromiseState!: 'pending' | 'resolved' | 'rejected';\n  /** @internal */\n  _readyPromise!: Promise<undefined>;\n  /** @internal */\n  _readyPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _readyPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readyPromiseState!: 'pending' | 'fulfilled' | 'rejected';\n\n  constructor(stream: WritableStream<W>) {\n    assertRequiredArgument(stream, 1, 'WritableStreamDefaultWriter');\n    assertWritableStream(stream, 'First parameter');\n\n    if (IsWritableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive writing by another writer');\n    }\n\n    this._ownerWritableStream = stream;\n    stream._writer = this;\n\n    const state = stream._state;\n\n    if (state === 'writable') {\n      if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._backpressure) {\n        defaultWriterReadyPromiseInitialize(this);\n      } else {\n        defaultWriterReadyPromiseInitializeAsResolved(this);\n      }\n\n      defaultWriterClosedPromiseInitialize(this);\n    } else if (state === 'erroring') {\n      defaultWriterReadyPromiseInitializeAsRejected(this, stream._storedError);\n      defaultWriterClosedPromiseInitialize(this);\n    } else if (state === 'closed') {\n      defaultWriterReadyPromiseInitializeAsResolved(this);\n      defaultWriterClosedPromiseInitializeAsResolved(this);\n    } else {\n      assert(state === 'errored');\n\n      const storedError = stream._storedError;\n      defaultWriterReadyPromiseInitializeAsRejected(this, storedError);\n      defaultWriterClosedPromiseInitializeAsRejected(this, storedError);\n    }\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or\n   * the writer’s lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * Returns the desired size to fill the stream’s internal queue. It can be negative, if the queue is over-full.\n   * A producer can use this information to determine the right amount of data to write.\n   *\n   * It will be `null` if the stream cannot be successfully written to (due to either being errored, or having an abort\n   * queued up). It will return zero if the stream is closed. And the getter will throw an exception if invoked when\n   * the writer’s lock is released.\n   */\n  get desiredSize(): number | null {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      throw defaultWriterBrandCheckException('desiredSize');\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      throw defaultWriterLockException('desiredSize');\n    }\n\n    return WritableStreamDefaultWriterGetDesiredSize(this);\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the desired size to fill the stream’s internal queue transitions\n   * from non-positive to positive, signaling that it is no longer applying backpressure. Once the desired size dips\n   * back to zero or below, the getter will return a new promise that stays pending until the next transition.\n   *\n   * If the stream becomes errored or aborted, or the writer’s lock is released, the returned promise will become\n   * rejected.\n   */\n  get ready(): Promise<undefined> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('ready'));\n    }\n\n    return this._readyPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link WritableStream.abort | stream.abort(reason)}.\n   */\n  abort(reason: any = undefined): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('abort'));\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('abort'));\n    }\n\n    return WritableStreamDefaultWriterAbort(this, reason);\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link WritableStream.close | stream.close()}.\n   */\n  close(): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('close'));\n    }\n\n    const stream = this._ownerWritableStream;\n\n    if (stream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('close'));\n    }\n\n    if (WritableStreamCloseQueuedOrInFlight(stream)) {\n      return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));\n    }\n\n    return WritableStreamDefaultWriterClose(this);\n  }\n\n  /**\n   * Releases the writer’s lock on the corresponding stream. After the lock is released, the writer is no longer active.\n   * If the associated stream is errored when the lock is released, the writer will appear errored in the same way from\n   * now on; otherwise, the writer will appear closed.\n   *\n   * Note that the lock can still be released even if some ongoing writes have not yet finished (i.e. even if the\n   * promises returned from previous calls to {@link WritableStreamDefaultWriter.write | write()} have not yet settled).\n   * It’s not necessary to hold the lock on the writer for the duration of the write; the lock instead simply prevents\n   * other producers from writing in an interleaved manner.\n   */\n  releaseLock(): void {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      throw defaultWriterBrandCheckException('releaseLock');\n    }\n\n    const stream = this._ownerWritableStream;\n\n    if (stream === undefined) {\n      return;\n    }\n\n    assert(stream._writer !== undefined);\n\n    WritableStreamDefaultWriterRelease(this);\n  }\n\n  /**\n   * Writes the given chunk to the writable stream, by waiting until any previous writes have finished successfully,\n   * and then sending the chunk to the underlying sink's {@link UnderlyingSink.write | write()} method. It will return\n   * a promise that fulfills with undefined upon a successful write, or rejects if the write fails or stream becomes\n   * errored before the writing process is initiated.\n   *\n   * Note that what \"success\" means is up to the underlying sink; it might indicate simply that the chunk has been\n   * accepted, and not necessarily that it is safely saved to its ultimate destination.\n   */\n  write(chunk: W): Promise<void>;\n  write(chunk: W = undefined!): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('write'));\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('write to'));\n    }\n\n    return WritableStreamDefaultWriterWrite(this, chunk);\n  }\n}\n\nObject.defineProperties(WritableStreamDefaultWriter.prototype, {\n  abort: { enumerable: true },\n  close: { enumerable: true },\n  releaseLock: { enumerable: true },\n  write: { enumerable: true },\n  closed: { enumerable: true },\n  desiredSize: { enumerable: true },\n  ready: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStreamDefaultWriter.prototype, Symbol.toStringTag, {\n    value: 'WritableStreamDefaultWriter',\n    configurable: true\n  });\n}\n\n// Abstract operations for the WritableStreamDefaultWriter.\n\nfunction IsWritableStreamDefaultWriter<W = any>(x: any): x is WritableStreamDefaultWriter<W> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) {\n    return false;\n  }\n\n  return x instanceof WritableStreamDefaultWriter;\n}\n\n// A client of WritableStreamDefaultWriter may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultWriterAbort(writer: WritableStreamDefaultWriter, reason: any) {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  return WritableStreamAbort(stream, reason);\n}\n\nfunction WritableStreamDefaultWriterClose(writer: WritableStreamDefaultWriter): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  return WritableStreamClose(stream);\n}\n\nfunction WritableStreamDefaultWriterCloseWithErrorPropagation(writer: WritableStreamDefaultWriter): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  const state = stream._state;\n  if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {\n    return promiseResolvedWith(undefined);\n  }\n\n  if (state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n\n  return WritableStreamDefaultWriterClose(writer);\n}\n\nfunction WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer: WritableStreamDefaultWriter, error: any) {\n  if (writer._closedPromiseState === 'pending') {\n    defaultWriterClosedPromiseReject(writer, error);\n  } else {\n    defaultWriterClosedPromiseResetToRejected(writer, error);\n  }\n}\n\nfunction WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer: WritableStreamDefaultWriter, error: any) {\n  if (writer._readyPromiseState === 'pending') {\n    defaultWriterReadyPromiseReject(writer, error);\n  } else {\n    defaultWriterReadyPromiseResetToRejected(writer, error);\n  }\n}\n\nfunction WritableStreamDefaultWriterGetDesiredSize(writer: WritableStreamDefaultWriter): number | null {\n  const stream = writer._ownerWritableStream;\n  const state = stream._state;\n\n  if (state === 'errored' || state === 'erroring') {\n    return null;\n  }\n\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return WritableStreamDefaultControllerGetDesiredSize(stream._writableStreamController);\n}\n\nfunction WritableStreamDefaultWriterRelease(writer: WritableStreamDefaultWriter) {\n  const stream = writer._ownerWritableStream;\n  assert(stream !== undefined);\n  assert(stream._writer === writer);\n\n  const releasedError = new TypeError(\n    `Writer was released and can no longer be used to monitor the stream's closedness`);\n\n  WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, releasedError);\n\n  // The state transitions to \"errored\" before the sink abort() method runs, but the writer.closed promise is not\n  // rejected until afterwards. This means that simply testing state will not work.\n  WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, releasedError);\n\n  stream._writer = undefined;\n  writer._ownerWritableStream = undefined!;\n}\n\nfunction WritableStreamDefaultWriterWrite<W>(writer: WritableStreamDefaultWriter<W>, chunk: W): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  const controller = stream._writableStreamController;\n\n  const chunkSize = WritableStreamDefaultControllerGetChunkSize(controller, chunk);\n\n  if (stream !== writer._ownerWritableStream) {\n    return promiseRejectedWith(defaultWriterLockException('write to'));\n  }\n\n  const state = stream._state;\n  if (state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n  if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {\n    return promiseRejectedWith(new TypeError('The stream is closing or closed and cannot be written to'));\n  }\n  if (state === 'erroring') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  assert(state === 'writable');\n\n  const promise = WritableStreamAddWriteRequest(stream);\n\n  WritableStreamDefaultControllerWrite(controller, chunk, chunkSize);\n\n  return promise;\n}\n\nconst closeSentinel: unique symbol = {} as any;\n\ntype QueueRecord<W> = W | typeof closeSentinel;\n\n/**\n * Allows control of a {@link WritableStream | writable stream}'s state and internal queue.\n *\n * @public\n */\nexport class WritableStreamDefaultController<W = any> {\n  /** @internal */\n  _controlledWritableStream!: WritableStream<W>;\n  /** @internal */\n  _queue!: SimpleQueue<QueuePair<QueueRecord<W>>>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _abortReason: any;\n  /** @internal */\n  _abortController: AbortController | undefined;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _strategySizeAlgorithm!: QueuingStrategySizeCallback<W>;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _writeAlgorithm!: (chunk: W) => Promise<void>;\n  /** @internal */\n  _closeAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _abortAlgorithm!: (reason: any) => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * The reason which was passed to `WritableStream.abort(reason)` when the stream was aborted.\n   *\n   * @deprecated\n   *  This property has been removed from the specification, see https://github.com/whatwg/streams/pull/1177.\n   *  Use {@link WritableStreamDefaultController.signal}'s `reason` instead.\n   */\n  get abortReason(): any {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('abortReason');\n    }\n    return this._abortReason;\n  }\n\n  /**\n   * An `AbortSignal` that can be used to abort the pending write or close operation when the stream is aborted.\n   */\n  get signal(): AbortSignal {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('signal');\n    }\n    if (this._abortController === undefined) {\n      // Older browsers or older Node versions may not support `AbortController` or `AbortSignal`.\n      // We don't want to bundle and ship an `AbortController` polyfill together with our polyfill,\n      // so instead we only implement support for `signal` if we find a global `AbortController` constructor.\n      throw new TypeError('WritableStreamDefaultController.prototype.signal is not supported');\n    }\n    return this._abortController.signal;\n  }\n\n  /**\n   * Closes the controlled writable stream, making all future interactions with it fail with the given error `e`.\n   *\n   * This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying\n   * sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the\n   * normal lifecycle of interactions with the underlying sink.\n   */\n  error(e: any = undefined): void {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n    const state = this._controlledWritableStream._state;\n    if (state !== 'writable') {\n      // The stream is closed, errored or will be soon. The sink can't do anything useful if it gets an error here, so\n      // just treat it as a no-op.\n      return;\n    }\n\n    WritableStreamDefaultControllerError(this, e);\n  }\n\n  /** @internal */\n  [AbortSteps](reason: any): Promise<void> {\n    const result = this._abortAlgorithm(reason);\n    WritableStreamDefaultControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [ErrorSteps]() {\n    ResetQueue(this);\n  }\n}\n\nObject.defineProperties(WritableStreamDefaultController.prototype, {\n  abortReason: { enumerable: true },\n  signal: { enumerable: true },\n  error: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'WritableStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Abstract operations implementing interface required by the WritableStream.\n\nfunction IsWritableStreamDefaultController(x: any): x is WritableStreamDefaultController<any> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledWritableStream')) {\n    return false;\n  }\n\n  return x instanceof WritableStreamDefaultController;\n}\n\nfunction SetUpWritableStreamDefaultController<W>(stream: WritableStream<W>,\n                                                 controller: WritableStreamDefaultController<W>,\n                                                 startAlgorithm: () => void | PromiseLike<void>,\n                                                 writeAlgorithm: (chunk: W) => Promise<void>,\n                                                 closeAlgorithm: () => Promise<void>,\n                                                 abortAlgorithm: (reason: any) => Promise<void>,\n                                                 highWaterMark: number,\n                                                 sizeAlgorithm: QueuingStrategySizeCallback<W>) {\n  assert(IsWritableStream(stream));\n  assert(stream._writableStreamController === undefined);\n\n  controller._controlledWritableStream = stream;\n  stream._writableStreamController = controller;\n\n  // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n  controller._queue = undefined!;\n  controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._abortReason = undefined;\n  controller._abortController = createAbortController();\n  controller._started = false;\n\n  controller._strategySizeAlgorithm = sizeAlgorithm;\n  controller._strategyHWM = highWaterMark;\n\n  controller._writeAlgorithm = writeAlgorithm;\n  controller._closeAlgorithm = closeAlgorithm;\n  controller._abortAlgorithm = abortAlgorithm;\n\n  const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n  WritableStreamUpdateBackpressure(stream, backpressure);\n\n  const startResult = startAlgorithm();\n  const startPromise = promiseResolvedWith(startResult);\n  uponPromise(\n    startPromise,\n    () => {\n      assert(stream._state === 'writable' || stream._state === 'erroring');\n      controller._started = true;\n      WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n    },\n    r => {\n      assert(stream._state === 'writable' || stream._state === 'erroring');\n      controller._started = true;\n      WritableStreamDealWithRejection(stream, r);\n    }\n  );\n}\n\nfunction SetUpWritableStreamDefaultControllerFromUnderlyingSink<W>(stream: WritableStream<W>,\n                                                                   underlyingSink: ValidatedUnderlyingSink<W>,\n                                                                   highWaterMark: number,\n                                                                   sizeAlgorithm: QueuingStrategySizeCallback<W>) {\n  const controller = Object.create(WritableStreamDefaultController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let writeAlgorithm: (chunk: W) => Promise<void> = () => promiseResolvedWith(undefined);\n  let closeAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let abortAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingSink.start !== undefined) {\n    startAlgorithm = () => underlyingSink.start!(controller);\n  }\n  if (underlyingSink.write !== undefined) {\n    writeAlgorithm = chunk => underlyingSink.write!(chunk, controller);\n  }\n  if (underlyingSink.close !== undefined) {\n    closeAlgorithm = () => underlyingSink.close!();\n  }\n  if (underlyingSink.abort !== undefined) {\n    abortAlgorithm = reason => underlyingSink.abort!(reason);\n  }\n\n  SetUpWritableStreamDefaultController(\n    stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm\n  );\n}\n\n// ClearAlgorithms may be called twice. Erroring the same stream in multiple ways will often result in redundant calls.\nfunction WritableStreamDefaultControllerClearAlgorithms(controller: WritableStreamDefaultController<any>) {\n  controller._writeAlgorithm = undefined!;\n  controller._closeAlgorithm = undefined!;\n  controller._abortAlgorithm = undefined!;\n  controller._strategySizeAlgorithm = undefined!;\n}\n\nfunction WritableStreamDefaultControllerClose<W>(controller: WritableStreamDefaultController<W>) {\n  EnqueueValueWithSize(controller, closeSentinel, 0);\n  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\nfunction WritableStreamDefaultControllerGetChunkSize<W>(controller: WritableStreamDefaultController<W>,\n                                                        chunk: W): number {\n  try {\n    return controller._strategySizeAlgorithm(chunk);\n  } catch (chunkSizeE) {\n    WritableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE);\n    return 1;\n  }\n}\n\nfunction WritableStreamDefaultControllerGetDesiredSize(controller: WritableStreamDefaultController<any>): number {\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\nfunction WritableStreamDefaultControllerWrite<W>(controller: WritableStreamDefaultController<W>,\n                                                 chunk: W,\n                                                 chunkSize: number) {\n  try {\n    EnqueueValueWithSize(controller, chunk, chunkSize);\n  } catch (enqueueE) {\n    WritableStreamDefaultControllerErrorIfNeeded(controller, enqueueE);\n    return;\n  }\n\n  const stream = controller._controlledWritableStream;\n  if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._state === 'writable') {\n    const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n    WritableStreamUpdateBackpressure(stream, backpressure);\n  }\n\n  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\n// Abstract operations for the WritableStreamDefaultController.\n\nfunction WritableStreamDefaultControllerAdvanceQueueIfNeeded<W>(controller: WritableStreamDefaultController<W>) {\n  const stream = controller._controlledWritableStream;\n\n  if (!controller._started) {\n    return;\n  }\n\n  if (stream._inFlightWriteRequest !== undefined) {\n    return;\n  }\n\n  const state = stream._state;\n  assert(state !== 'closed' && state !== 'errored');\n  if (state === 'erroring') {\n    WritableStreamFinishErroring(stream);\n    return;\n  }\n\n  if (controller._queue.length === 0) {\n    return;\n  }\n\n  const value = PeekQueueValue(controller);\n  if (value === closeSentinel) {\n    WritableStreamDefaultControllerProcessClose(controller);\n  } else {\n    WritableStreamDefaultControllerProcessWrite(controller, value);\n  }\n}\n\nfunction WritableStreamDefaultControllerErrorIfNeeded(controller: WritableStreamDefaultController<any>, error: any) {\n  if (controller._controlledWritableStream._state === 'writable') {\n    WritableStreamDefaultControllerError(controller, error);\n  }\n}\n\nfunction WritableStreamDefaultControllerProcessClose(controller: WritableStreamDefaultController<any>) {\n  const stream = controller._controlledWritableStream;\n\n  WritableStreamMarkCloseRequestInFlight(stream);\n\n  DequeueValue(controller);\n  assert(controller._queue.length === 0);\n\n  const sinkClosePromise = controller._closeAlgorithm();\n  WritableStreamDefaultControllerClearAlgorithms(controller);\n  uponPromise(\n    sinkClosePromise,\n    () => {\n      WritableStreamFinishInFlightClose(stream);\n    },\n    reason => {\n      WritableStreamFinishInFlightCloseWithError(stream, reason);\n    }\n  );\n}\n\nfunction WritableStreamDefaultControllerProcessWrite<W>(controller: WritableStreamDefaultController<W>, chunk: W) {\n  const stream = controller._controlledWritableStream;\n\n  WritableStreamMarkFirstWriteRequestInFlight(stream);\n\n  const sinkWritePromise = controller._writeAlgorithm(chunk);\n  uponPromise(\n    sinkWritePromise,\n    () => {\n      WritableStreamFinishInFlightWrite(stream);\n\n      const state = stream._state;\n      assert(state === 'writable' || state === 'erroring');\n\n      DequeueValue(controller);\n\n      if (!WritableStreamCloseQueuedOrInFlight(stream) && state === 'writable') {\n        const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n        WritableStreamUpdateBackpressure(stream, backpressure);\n      }\n\n      WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n    },\n    reason => {\n      if (stream._state === 'writable') {\n        WritableStreamDefaultControllerClearAlgorithms(controller);\n      }\n      WritableStreamFinishInFlightWriteWithError(stream, reason);\n    }\n  );\n}\n\nfunction WritableStreamDefaultControllerGetBackpressure(controller: WritableStreamDefaultController<any>): boolean {\n  const desiredSize = WritableStreamDefaultControllerGetDesiredSize(controller);\n  return desiredSize <= 0;\n}\n\n// A client of WritableStreamDefaultController may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultControllerError(controller: WritableStreamDefaultController<any>, error: any) {\n  const stream = controller._controlledWritableStream;\n\n  assert(stream._state === 'writable');\n\n  WritableStreamDefaultControllerClearAlgorithms(controller);\n  WritableStreamStartErroring(stream, error);\n}\n\n// Helper functions for the WritableStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(`WritableStream.prototype.${name} can only be used on a WritableStream`);\n}\n\n// Helper functions for the WritableStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `WritableStreamDefaultController.prototype.${name} can only be used on a WritableStreamDefaultController`);\n}\n\n\n// Helper functions for the WritableStreamDefaultWriter.\n\nfunction defaultWriterBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `WritableStreamDefaultWriter.prototype.${name} can only be used on a WritableStreamDefaultWriter`);\n}\n\nfunction defaultWriterLockException(name: string): TypeError {\n  return new TypeError('Cannot ' + name + ' a stream using a released writer');\n}\n\nfunction defaultWriterClosedPromiseInitialize(writer: WritableStreamDefaultWriter) {\n  writer._closedPromise = newPromise((resolve, reject) => {\n    writer._closedPromise_resolve = resolve;\n    writer._closedPromise_reject = reject;\n    writer._closedPromiseState = 'pending';\n  });\n}\n\nfunction defaultWriterClosedPromiseInitializeAsRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  defaultWriterClosedPromiseInitialize(writer);\n  defaultWriterClosedPromiseReject(writer, reason);\n}\n\nfunction defaultWriterClosedPromiseInitializeAsResolved(writer: WritableStreamDefaultWriter) {\n  defaultWriterClosedPromiseInitialize(writer);\n  defaultWriterClosedPromiseResolve(writer);\n}\n\nfunction defaultWriterClosedPromiseReject(writer: WritableStreamDefaultWriter, reason: any) {\n  if (writer._closedPromise_reject === undefined) {\n    return;\n  }\n  assert(writer._closedPromiseState === 'pending');\n\n  setPromiseIsHandledToTrue(writer._closedPromise);\n  writer._closedPromise_reject(reason);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'rejected';\n}\n\nfunction defaultWriterClosedPromiseResetToRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  assert(writer._closedPromise_resolve === undefined);\n  assert(writer._closedPromise_reject === undefined);\n  assert(writer._closedPromiseState !== 'pending');\n\n  defaultWriterClosedPromiseInitializeAsRejected(writer, reason);\n}\n\nfunction defaultWriterClosedPromiseResolve(writer: WritableStreamDefaultWriter) {\n  if (writer._closedPromise_resolve === undefined) {\n    return;\n  }\n  assert(writer._closedPromiseState === 'pending');\n\n  writer._closedPromise_resolve(undefined);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'resolved';\n}\n\nfunction defaultWriterReadyPromiseInitialize(writer: WritableStreamDefaultWriter) {\n  writer._readyPromise = newPromise((resolve, reject) => {\n    writer._readyPromise_resolve = resolve;\n    writer._readyPromise_reject = reject;\n  });\n  writer._readyPromiseState = 'pending';\n}\n\nfunction defaultWriterReadyPromiseInitializeAsRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  defaultWriterReadyPromiseInitialize(writer);\n  defaultWriterReadyPromiseReject(writer, reason);\n}\n\nfunction defaultWriterReadyPromiseInitializeAsResolved(writer: WritableStreamDefaultWriter) {\n  defaultWriterReadyPromiseInitialize(writer);\n  defaultWriterReadyPromiseResolve(writer);\n}\n\nfunction defaultWriterReadyPromiseReject(writer: WritableStreamDefaultWriter, reason: any) {\n  if (writer._readyPromise_reject === undefined) {\n    return;\n  }\n\n  setPromiseIsHandledToTrue(writer._readyPromise);\n  writer._readyPromise_reject(reason);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'rejected';\n}\n\nfunction defaultWriterReadyPromiseReset(writer: WritableStreamDefaultWriter) {\n  assert(writer._readyPromise_resolve === undefined);\n  assert(writer._readyPromise_reject === undefined);\n\n  defaultWriterReadyPromiseInitialize(writer);\n}\n\nfunction defaultWriterReadyPromiseResetToRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  assert(writer._readyPromise_resolve === undefined);\n  assert(writer._readyPromise_reject === undefined);\n\n  defaultWriterReadyPromiseInitializeAsRejected(writer, reason);\n}\n\nfunction defaultWriterReadyPromiseResolve(writer: WritableStreamDefaultWriter) {\n  if (writer._readyPromise_resolve === undefined) {\n    return;\n  }\n\n  writer._readyPromise_resolve(undefined);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'fulfilled';\n}\n","/// <reference lib=\"dom\" />\nexport const NativeDOMException: typeof DOMException | undefined =\n  typeof DOMException !== 'undefined' ? DOMException : undefined;\n","/// <reference types=\"node\" />\nimport { NativeDOMException } from './native';\n\ndeclare class DOMExceptionClass extends Error {\n  constructor(message?: string, name?: string);\n\n  name: string;\n  message: string;\n}\n\ntype DOMException = DOMExceptionClass;\ntype DOMExceptionConstructor = typeof DOMExceptionClass;\n\nfunction isDOMExceptionConstructor(ctor: unknown): ctor is DOMExceptionConstructor {\n  if (!(typeof ctor === 'function' || typeof ctor === 'object')) {\n    return false;\n  }\n  try {\n    new (ctor as DOMExceptionConstructor)();\n    return true;\n  } catch {\n    return false;\n  }\n}\n\nfunction createDOMExceptionPolyfill(): DOMExceptionConstructor {\n  // eslint-disable-next-line no-shadow\n  const ctor = function DOMException(this: DOMException, message?: string, name?: string) {\n    this.message = message || '';\n    this.name = name || 'Error';\n    if (Error.captureStackTrace) {\n      Error.captureStackTrace(this, this.constructor);\n    }\n  } as any;\n  ctor.prototype = Object.create(Error.prototype);\n  Object.defineProperty(ctor.prototype, 'constructor', { value: ctor, writable: true, configurable: true });\n  return ctor;\n}\n\n// eslint-disable-next-line no-redeclare\nconst DOMException: DOMExceptionConstructor =\n  isDOMExceptionConstructor(NativeDOMException) ? NativeDOMException : createDOMExceptionPolyfill();\n\nexport { DOMException };\n","import { IsReadableStream, IsReadableStreamLocked, ReadableStream, ReadableStreamCancel } from '../readable-stream';\nimport { AcquireReadableStreamDefaultReader, ReadableStreamDefaultReaderRead } from './default-reader';\nimport { ReadableStreamReaderGenericRelease } from './generic-reader';\nimport {\n  AcquireWritableStreamDefaultWriter,\n  IsWritableStream,\n  IsWritableStreamLocked,\n  WritableStream,\n  WritableStreamAbort,\n  WritableStreamCloseQueuedOrInFlight,\n  WritableStreamDefaultWriterCloseWithErrorPropagation,\n  WritableStreamDefaultWriterRelease,\n  WritableStreamDefaultWriterWrite\n} from '../writable-stream';\nimport assert from '../../stub/assert';\nimport {\n  newPromise,\n  PerformPromiseThen,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  uponFulfillment,\n  uponPromise,\n  uponRejection\n} from '../helpers/webidl';\nimport { noop } from '../../utils';\nimport { AbortSignal, isAbortSignal } from '../abort-signal';\nimport { DOMException } from '../../stub/dom-exception';\n\nexport function ReadableStreamPipeTo<T>(source: ReadableStream<T>,\n                                        dest: WritableStream<T>,\n                                        preventClose: boolean,\n                                        preventAbort: boolean,\n                                        preventCancel: boolean,\n                                        signal: AbortSignal | undefined): Promise<undefined> {\n  assert(IsReadableStream(source));\n  assert(IsWritableStream(dest));\n  assert(typeof preventClose === 'boolean');\n  assert(typeof preventAbort === 'boolean');\n  assert(typeof preventCancel === 'boolean');\n  assert(signal === undefined || isAbortSignal(signal));\n  assert(!IsReadableStreamLocked(source));\n  assert(!IsWritableStreamLocked(dest));\n\n  const reader = AcquireReadableStreamDefaultReader<T>(source);\n  const writer = AcquireWritableStreamDefaultWriter<T>(dest);\n\n  source._disturbed = true;\n\n  let shuttingDown = false;\n\n  // This is used to keep track of the spec's requirement that we wait for ongoing writes during shutdown.\n  let currentWrite = promiseResolvedWith<void>(undefined);\n\n  return newPromise((resolve, reject) => {\n    let abortAlgorithm: () => void;\n    if (signal !== undefined) {\n      abortAlgorithm = () => {\n        const error = new DOMException('Aborted', 'AbortError');\n        const actions: Array<() => Promise<void>> = [];\n        if (!preventAbort) {\n          actions.push(() => {\n            if (dest._state === 'writable') {\n              return WritableStreamAbort(dest, error);\n            }\n            return promiseResolvedWith(undefined);\n          });\n        }\n        if (!preventCancel) {\n          actions.push(() => {\n            if (source._state === 'readable') {\n              return ReadableStreamCancel(source, error);\n            }\n            return promiseResolvedWith(undefined);\n          });\n        }\n        shutdownWithAction(() => Promise.all(actions.map(action => action())), true, error);\n      };\n\n      if (signal.aborted) {\n        abortAlgorithm();\n        return;\n      }\n\n      signal.addEventListener('abort', abortAlgorithm);\n    }\n\n    // Using reader and writer, read all chunks from this and write them to dest\n    // - Backpressure must be enforced\n    // - Shutdown must stop all activity\n    function pipeLoop() {\n      return newPromise<void>((resolveLoop, rejectLoop) => {\n        function next(done: boolean) {\n          if (done) {\n            resolveLoop();\n          } else {\n            // Use `PerformPromiseThen` instead of `uponPromise` to avoid\n            // adding unnecessary `.catch(rethrowAssertionErrorRejection)` handlers\n            PerformPromiseThen(pipeStep(), next, rejectLoop);\n          }\n        }\n\n        next(false);\n      });\n    }\n\n    function pipeStep(): Promise<boolean> {\n      if (shuttingDown) {\n        return promiseResolvedWith(true);\n      }\n\n      return PerformPromiseThen(writer._readyPromise, () => {\n        return newPromise<boolean>((resolveRead, rejectRead) => {\n          ReadableStreamDefaultReaderRead(\n            reader,\n            {\n              _chunkSteps: chunk => {\n                currentWrite = PerformPromiseThen(WritableStreamDefaultWriterWrite(writer, chunk), undefined, noop);\n                resolveRead(false);\n              },\n              _closeSteps: () => resolveRead(true),\n              _errorSteps: rejectRead\n            }\n          );\n        });\n      });\n    }\n\n    // Errors must be propagated forward\n    isOrBecomesErrored(source, reader._closedPromise, storedError => {\n      if (!preventAbort) {\n        shutdownWithAction(() => WritableStreamAbort(dest, storedError), true, storedError);\n      } else {\n        shutdown(true, storedError);\n      }\n    });\n\n    // Errors must be propagated backward\n    isOrBecomesErrored(dest, writer._closedPromise, storedError => {\n      if (!preventCancel) {\n        shutdownWithAction(() => ReadableStreamCancel(source, storedError), true, storedError);\n      } else {\n        shutdown(true, storedError);\n      }\n    });\n\n    // Closing must be propagated forward\n    isOrBecomesClosed(source, reader._closedPromise, () => {\n      if (!preventClose) {\n        shutdownWithAction(() => WritableStreamDefaultWriterCloseWithErrorPropagation(writer));\n      } else {\n        shutdown();\n      }\n    });\n\n    // Closing must be propagated backward\n    if (WritableStreamCloseQueuedOrInFlight(dest) || dest._state === 'closed') {\n      const destClosed = new TypeError('the destination writable stream closed before all data could be piped to it');\n\n      if (!preventCancel) {\n        shutdownWithAction(() => ReadableStreamCancel(source, destClosed), true, destClosed);\n      } else {\n        shutdown(true, destClosed);\n      }\n    }\n\n    setPromiseIsHandledToTrue(pipeLoop());\n\n    function waitForWritesToFinish(): Promise<void> {\n      // Another write may have started while we were waiting on this currentWrite, so we have to be sure to wait\n      // for that too.\n      const oldCurrentWrite = currentWrite;\n      return PerformPromiseThen(\n        currentWrite,\n        () => oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined\n      );\n    }\n\n    function isOrBecomesErrored(stream: ReadableStream | WritableStream,\n                                promise: Promise<void>,\n                                action: (reason: any) => void) {\n      if (stream._state === 'errored') {\n        action(stream._storedError);\n      } else {\n        uponRejection(promise, action);\n      }\n    }\n\n    function isOrBecomesClosed(stream: ReadableStream | WritableStream, promise: Promise<void>, action: () => void) {\n      if (stream._state === 'closed') {\n        action();\n      } else {\n        uponFulfillment(promise, action);\n      }\n    }\n\n    function shutdownWithAction(action: () => Promise<unknown>, originalIsError?: boolean, originalError?: any) {\n      if (shuttingDown) {\n        return;\n      }\n      shuttingDown = true;\n\n      if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {\n        uponFulfillment(waitForWritesToFinish(), doTheRest);\n      } else {\n        doTheRest();\n      }\n\n      function doTheRest() {\n        uponPromise(\n          action(),\n          () => finalize(originalIsError, originalError),\n          newError => finalize(true, newError)\n        );\n      }\n    }\n\n    function shutdown(isError?: boolean, error?: any) {\n      if (shuttingDown) {\n        return;\n      }\n      shuttingDown = true;\n\n      if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {\n        uponFulfillment(waitForWritesToFinish(), () => finalize(isError, error));\n      } else {\n        finalize(isError, error);\n      }\n    }\n\n    function finalize(isError?: boolean, error?: any) {\n      WritableStreamDefaultWriterRelease(writer);\n      ReadableStreamReaderGenericRelease(reader);\n\n      if (signal !== undefined) {\n        signal.removeEventListener('abort', abortAlgorithm);\n      }\n      if (isError) {\n        reject(error);\n      } else {\n        resolve(undefined);\n      }\n    }\n  });\n}\n","import { QueuingStrategySizeCallback } from '../queuing-strategy';\nimport assert from '../../stub/assert';\nimport { DequeueValue, EnqueueValueWithSize, QueuePair, ResetQueue } from '../abstract-ops/queue-with-sizes';\nimport {\n  ReadableStreamAddReadRequest,\n  ReadableStreamFulfillReadRequest,\n  ReadableStreamGetNumReadRequests,\n  ReadRequest\n} from './default-reader';\nimport { SimpleQueue } from '../simple-queue';\nimport { IsReadableStreamLocked, ReadableStream, ReadableStreamClose, ReadableStreamError } from '../readable-stream';\nimport { ValidatedUnderlyingSource } from './underlying-source';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { CancelSteps, PullSteps } from '../abstract-ops/internal-methods';\nimport { promiseResolvedWith, uponPromise } from '../helpers/webidl';\n\n/**\n * Allows control of a {@link ReadableStream | readable stream}'s state and internal queue.\n *\n * @public\n */\nexport class ReadableStreamDefaultController<R> {\n  /** @internal */\n  _controlledReadableStream!: ReadableStream<R>;\n  /** @internal */\n  _queue!: SimpleQueue<QueuePair<R>>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _closeRequested!: boolean;\n  /** @internal */\n  _pullAgain!: boolean;\n  /** @internal */\n  _pulling !: boolean;\n  /** @internal */\n  _strategySizeAlgorithm!: QueuingStrategySizeCallback<R>;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _pullAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _cancelAlgorithm!: (reason: any) => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is\n   * over-full. An underlying source ought to use this information to determine when and how to apply backpressure.\n   */\n  get desiredSize(): number | null {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('desiredSize');\n    }\n\n    return ReadableStreamDefaultControllerGetDesiredSize(this);\n  }\n\n  /**\n   * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from\n   * the stream, but once those are read, the stream will become closed.\n   */\n  close(): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('close');\n    }\n\n    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {\n      throw new TypeError('The stream is not in a state that permits close');\n    }\n\n    ReadableStreamDefaultControllerClose(this);\n  }\n\n  /**\n   * Enqueues the given chunk `chunk` in the controlled readable stream.\n   */\n  enqueue(chunk: R): void;\n  enqueue(chunk: R = undefined!): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('enqueue');\n    }\n\n    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {\n      throw new TypeError('The stream is not in a state that permits enqueue');\n    }\n\n    return ReadableStreamDefaultControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.\n   */\n  error(e: any = undefined): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n\n    ReadableStreamDefaultControllerError(this, e);\n  }\n\n  /** @internal */\n  [CancelSteps](reason: any): Promise<void> {\n    ResetQueue(this);\n    const result = this._cancelAlgorithm(reason);\n    ReadableStreamDefaultControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [PullSteps](readRequest: ReadRequest<R>): void {\n    const stream = this._controlledReadableStream;\n\n    if (this._queue.length > 0) {\n      const chunk = DequeueValue(this);\n\n      if (this._closeRequested && this._queue.length === 0) {\n        ReadableStreamDefaultControllerClearAlgorithms(this);\n        ReadableStreamClose(stream);\n      } else {\n        ReadableStreamDefaultControllerCallPullIfNeeded(this);\n      }\n\n      readRequest._chunkSteps(chunk);\n    } else {\n      ReadableStreamAddReadRequest(stream, readRequest);\n      ReadableStreamDefaultControllerCallPullIfNeeded(this);\n    }\n  }\n}\n\nObject.defineProperties(ReadableStreamDefaultController.prototype, {\n  close: { enumerable: true },\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Abstract operations for the ReadableStreamDefaultController.\n\nfunction IsReadableStreamDefaultController<R = any>(x: any): x is ReadableStreamDefaultController<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableStream')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamDefaultController;\n}\n\nfunction ReadableStreamDefaultControllerCallPullIfNeeded(controller: ReadableStreamDefaultController<any>): void {\n  const shouldPull = ReadableStreamDefaultControllerShouldCallPull(controller);\n  if (!shouldPull) {\n    return;\n  }\n\n  if (controller._pulling) {\n    controller._pullAgain = true;\n    return;\n  }\n\n  assert(!controller._pullAgain);\n\n  controller._pulling = true;\n\n  const pullPromise = controller._pullAlgorithm();\n  uponPromise(\n    pullPromise,\n    () => {\n      controller._pulling = false;\n\n      if (controller._pullAgain) {\n        controller._pullAgain = false;\n        ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n      }\n    },\n    e => {\n      ReadableStreamDefaultControllerError(controller, e);\n    }\n  );\n}\n\nfunction ReadableStreamDefaultControllerShouldCallPull(controller: ReadableStreamDefaultController<any>): boolean {\n  const stream = controller._controlledReadableStream;\n\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return false;\n  }\n\n  if (!controller._started) {\n    return false;\n  }\n\n  if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    return true;\n  }\n\n  const desiredSize = ReadableStreamDefaultControllerGetDesiredSize(controller);\n  assert(desiredSize !== null);\n  if (desiredSize! > 0) {\n    return true;\n  }\n\n  return false;\n}\n\nfunction ReadableStreamDefaultControllerClearAlgorithms(controller: ReadableStreamDefaultController<any>) {\n  controller._pullAlgorithm = undefined!;\n  controller._cancelAlgorithm = undefined!;\n  controller._strategySizeAlgorithm = undefined!;\n}\n\n// A client of ReadableStreamDefaultController may use these functions directly to bypass state check.\n\nexport function ReadableStreamDefaultControllerClose(controller: ReadableStreamDefaultController<any>) {\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return;\n  }\n\n  const stream = controller._controlledReadableStream;\n\n  controller._closeRequested = true;\n\n  if (controller._queue.length === 0) {\n    ReadableStreamDefaultControllerClearAlgorithms(controller);\n    ReadableStreamClose(stream);\n  }\n}\n\nexport function ReadableStreamDefaultControllerEnqueue<R>(\n  controller: ReadableStreamDefaultController<R>,\n  chunk: R\n): void {\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return;\n  }\n\n  const stream = controller._controlledReadableStream;\n\n  if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    ReadableStreamFulfillReadRequest(stream, chunk, false);\n  } else {\n    let chunkSize;\n    try {\n      chunkSize = controller._strategySizeAlgorithm(chunk);\n    } catch (chunkSizeE) {\n      ReadableStreamDefaultControllerError(controller, chunkSizeE);\n      throw chunkSizeE;\n    }\n\n    try {\n      EnqueueValueWithSize(controller, chunk, chunkSize);\n    } catch (enqueueE) {\n      ReadableStreamDefaultControllerError(controller, enqueueE);\n      throw enqueueE;\n    }\n  }\n\n  ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n}\n\nexport function ReadableStreamDefaultControllerError(controller: ReadableStreamDefaultController<any>, e: any) {\n  const stream = controller._controlledReadableStream;\n\n  if (stream._state !== 'readable') {\n    return;\n  }\n\n  ResetQueue(controller);\n\n  ReadableStreamDefaultControllerClearAlgorithms(controller);\n  ReadableStreamError(stream, e);\n}\n\nexport function ReadableStreamDefaultControllerGetDesiredSize(\n  controller: ReadableStreamDefaultController<any>\n): number | null {\n  const state = controller._controlledReadableStream._state;\n\n  if (state === 'errored') {\n    return null;\n  }\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\n// This is used in the implementation of TransformStream.\nexport function ReadableStreamDefaultControllerHasBackpressure(\n  controller: ReadableStreamDefaultController<any>\n): boolean {\n  if (ReadableStreamDefaultControllerShouldCallPull(controller)) {\n    return false;\n  }\n\n  return true;\n}\n\nexport function ReadableStreamDefaultControllerCanCloseOrEnqueue(\n  controller: ReadableStreamDefaultController<any>\n): boolean {\n  const state = controller._controlledReadableStream._state;\n\n  if (!controller._closeRequested && state === 'readable') {\n    return true;\n  }\n\n  return false;\n}\n\nexport function SetUpReadableStreamDefaultController<R>(stream: ReadableStream<R>,\n                                                        controller: ReadableStreamDefaultController<R>,\n                                                        startAlgorithm: () => void | PromiseLike<void>,\n                                                        pullAlgorithm: () => Promise<void>,\n                                                        cancelAlgorithm: (reason: any) => Promise<void>,\n                                                        highWaterMark: number,\n                                                        sizeAlgorithm: QueuingStrategySizeCallback<R>) {\n  assert(stream._readableStreamController === undefined);\n\n  controller._controlledReadableStream = stream;\n\n  controller._queue = undefined!;\n  controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._started = false;\n  controller._closeRequested = false;\n  controller._pullAgain = false;\n  controller._pulling = false;\n\n  controller._strategySizeAlgorithm = sizeAlgorithm;\n  controller._strategyHWM = highWaterMark;\n\n  controller._pullAlgorithm = pullAlgorithm;\n  controller._cancelAlgorithm = cancelAlgorithm;\n\n  stream._readableStreamController = controller;\n\n  const startResult = startAlgorithm();\n  uponPromise(\n    promiseResolvedWith(startResult),\n    () => {\n      controller._started = true;\n\n      assert(!controller._pulling);\n      assert(!controller._pullAgain);\n\n      ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n    },\n    r => {\n      ReadableStreamDefaultControllerError(controller, r);\n    }\n  );\n}\n\nexport function SetUpReadableStreamDefaultControllerFromUnderlyingSource<R>(\n  stream: ReadableStream<R>,\n  underlyingSource: ValidatedUnderlyingSource<R>,\n  highWaterMark: number,\n  sizeAlgorithm: QueuingStrategySizeCallback<R>\n) {\n  const controller: ReadableStreamDefaultController<R> = Object.create(ReadableStreamDefaultController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let pullAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let cancelAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingSource.start !== undefined) {\n    startAlgorithm = () => underlyingSource.start!(controller);\n  }\n  if (underlyingSource.pull !== undefined) {\n    pullAlgorithm = () => underlyingSource.pull!(controller);\n  }\n  if (underlyingSource.cancel !== undefined) {\n    cancelAlgorithm = reason => underlyingSource.cancel!(reason);\n  }\n\n  SetUpReadableStreamDefaultController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm\n  );\n}\n\n// Helper functions for the ReadableStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamDefaultController.prototype.${name} can only be used on a ReadableStreamDefaultController`);\n}\n","import {\n  CreateReadableByteStream,\n  CreateReadableStream,\n  IsReadableStream,\n  ReadableByteStream,\n  ReadableStream,\n  ReadableStreamCancel,\n  ReadableStreamReader\n} from '../readable-stream';\nimport { ReadableStreamReaderGenericRelease } from './generic-reader';\nimport {\n  AcquireReadableStreamDefaultReader,\n  IsReadableStreamDefaultReader,\n  ReadableStreamDefaultReaderRead,\n  ReadRequest\n} from './default-reader';\nimport {\n  AcquireReadableStreamBYOBReader,\n  IsReadableStreamBYOBReader,\n  ReadableStreamBYOBReaderRead,\n  ReadIntoRequest\n} from './byob-reader';\nimport assert from '../../stub/assert';\nimport { newPromise, promiseResolvedWith, queueMicrotask, uponRejection } from '../helpers/webidl';\nimport {\n  ReadableStreamDefaultController,\n  ReadableStreamDefaultControllerClose,\n  ReadableStreamDefaultControllerEnqueue,\n  ReadableStreamDefaultControllerError\n} from './default-controller';\nimport {\n  IsReadableByteStreamController,\n  ReadableByteStreamControllerClose,\n  ReadableByteStreamControllerEnqueue,\n  ReadableByteStreamControllerError,\n  ReadableByteStreamControllerGetBYOBRequest,\n  ReadableByteStreamControllerRespond,\n  ReadableByteStreamControllerRespondWithNewView\n} from './byte-stream-controller';\nimport { CreateArrayFromList } from '../abstract-ops/ecmascript';\nimport { CloneAsUint8Array } from '../abstract-ops/miscellaneous';\n\nexport function ReadableStreamTee<R>(stream: ReadableStream<R>,\n                                     cloneForBranch2: boolean): [ReadableStream<R>, ReadableStream<R>] {\n  assert(IsReadableStream(stream));\n  assert(typeof cloneForBranch2 === 'boolean');\n  if (IsReadableByteStreamController(stream._readableStreamController)) {\n    return ReadableByteStreamTee(stream as unknown as ReadableByteStream) as\n      unknown as [ReadableStream<R>, ReadableStream<R>];\n  }\n  return ReadableStreamDefaultTee(stream, cloneForBranch2);\n}\n\nexport function ReadableStreamDefaultTee<R>(stream: ReadableStream<R>,\n                                            cloneForBranch2: boolean): [ReadableStream<R>, ReadableStream<R>] {\n  assert(IsReadableStream(stream));\n  assert(typeof cloneForBranch2 === 'boolean');\n\n  const reader = AcquireReadableStreamDefaultReader<R>(stream);\n\n  let reading = false;\n  let readAgain = false;\n  let canceled1 = false;\n  let canceled2 = false;\n  let reason1: any;\n  let reason2: any;\n  let branch1: ReadableStream<R>;\n  let branch2: ReadableStream<R>;\n\n  let resolveCancelPromise: (value: undefined | Promise<undefined>) => void;\n  const cancelPromise = newPromise<undefined>(resolve => {\n    resolveCancelPromise = resolve;\n  });\n\n  function pullAlgorithm(): Promise<void> {\n    if (reading) {\n      readAgain = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgain = false;\n          const chunk1 = chunk;\n          const chunk2 = chunk;\n\n          // There is no way to access the cloning code right now in the reference implementation.\n          // If we add one then we'll need an implementation for serializable objects.\n          // if (!canceled2 && cloneForBranch2) {\n          //   chunk2 = StructuredDeserialize(StructuredSerialize(chunk2));\n          // }\n\n          if (!canceled1) {\n            ReadableStreamDefaultControllerEnqueue(\n              branch1._readableStreamController as ReadableStreamDefaultController<R>,\n              chunk1\n            );\n          }\n          if (!canceled2) {\n            ReadableStreamDefaultControllerEnqueue(\n              branch2._readableStreamController as ReadableStreamDefaultController<R>,\n              chunk2\n            );\n          }\n\n          reading = false;\n          if (readAgain) {\n            pullAlgorithm();\n          }\n        });\n      },\n      _closeSteps: () => {\n        reading = false;\n        if (!canceled1) {\n          ReadableStreamDefaultControllerClose(branch1._readableStreamController as ReadableStreamDefaultController<R>);\n        }\n        if (!canceled2) {\n          ReadableStreamDefaultControllerClose(branch2._readableStreamController as ReadableStreamDefaultController<R>);\n        }\n\n        if (!canceled1 || !canceled2) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function cancel1Algorithm(reason: any): Promise<void> {\n    canceled1 = true;\n    reason1 = reason;\n    if (canceled2) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function cancel2Algorithm(reason: any): Promise<void> {\n    canceled2 = true;\n    reason2 = reason;\n    if (canceled1) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function startAlgorithm() {\n    // do nothing\n  }\n\n  branch1 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel1Algorithm);\n  branch2 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel2Algorithm);\n\n  uponRejection(reader._closedPromise, (r: any) => {\n    ReadableStreamDefaultControllerError(branch1._readableStreamController as ReadableStreamDefaultController<R>, r);\n    ReadableStreamDefaultControllerError(branch2._readableStreamController as ReadableStreamDefaultController<R>, r);\n    if (!canceled1 || !canceled2) {\n      resolveCancelPromise(undefined);\n    }\n  });\n\n  return [branch1, branch2];\n}\n\nexport function ReadableByteStreamTee(stream: ReadableByteStream): [ReadableByteStream, ReadableByteStream] {\n  assert(IsReadableStream(stream));\n  assert(IsReadableByteStreamController(stream._readableStreamController));\n\n  let reader: ReadableStreamReader<Uint8Array> = AcquireReadableStreamDefaultReader(stream);\n  let reading = false;\n  let readAgainForBranch1 = false;\n  let readAgainForBranch2 = false;\n  let canceled1 = false;\n  let canceled2 = false;\n  let reason1: any;\n  let reason2: any;\n  let branch1: ReadableByteStream;\n  let branch2: ReadableByteStream;\n\n  let resolveCancelPromise: (value: undefined | Promise<undefined>) => void;\n  const cancelPromise = newPromise<void>(resolve => {\n    resolveCancelPromise = resolve;\n  });\n\n  function forwardReaderError(thisReader: ReadableStreamReader<Uint8Array>) {\n    uponRejection(thisReader._closedPromise, r => {\n      if (thisReader !== reader) {\n        return;\n      }\n      ReadableByteStreamControllerError(branch1._readableStreamController, r);\n      ReadableByteStreamControllerError(branch2._readableStreamController, r);\n      if (!canceled1 || !canceled2) {\n        resolveCancelPromise(undefined);\n      }\n    });\n  }\n\n  function pullWithDefaultReader() {\n    if (IsReadableStreamBYOBReader(reader)) {\n      assert(reader._readIntoRequests.length === 0);\n      ReadableStreamReaderGenericRelease(reader);\n\n      reader = AcquireReadableStreamDefaultReader(stream);\n      forwardReaderError(reader);\n    }\n\n    const readRequest: ReadRequest<Uint8Array> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgainForBranch1 = false;\n          readAgainForBranch2 = false;\n\n          const chunk1 = chunk;\n          let chunk2 = chunk;\n          if (!canceled1 && !canceled2) {\n            try {\n              chunk2 = CloneAsUint8Array(chunk);\n            } catch (cloneE) {\n              ReadableByteStreamControllerError(branch1._readableStreamController, cloneE);\n              ReadableByteStreamControllerError(branch2._readableStreamController, cloneE);\n              resolveCancelPromise(ReadableStreamCancel(stream, cloneE));\n              return;\n            }\n          }\n\n          if (!canceled1) {\n            ReadableByteStreamControllerEnqueue(branch1._readableStreamController, chunk1);\n          }\n          if (!canceled2) {\n            ReadableByteStreamControllerEnqueue(branch2._readableStreamController, chunk2);\n          }\n\n          reading = false;\n          if (readAgainForBranch1) {\n            pull1Algorithm();\n          } else if (readAgainForBranch2) {\n            pull2Algorithm();\n          }\n        });\n      },\n      _closeSteps: () => {\n        reading = false;\n        if (!canceled1) {\n          ReadableByteStreamControllerClose(branch1._readableStreamController);\n        }\n        if (!canceled2) {\n          ReadableByteStreamControllerClose(branch2._readableStreamController);\n        }\n        if (branch1._readableStreamController._pendingPullIntos.length > 0) {\n          ReadableByteStreamControllerRespond(branch1._readableStreamController, 0);\n        }\n        if (branch2._readableStreamController._pendingPullIntos.length > 0) {\n          ReadableByteStreamControllerRespond(branch2._readableStreamController, 0);\n        }\n        if (!canceled1 || !canceled2) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n  }\n\n  function pullWithBYOBReader(view: ArrayBufferView, forBranch2: boolean) {\n    if (IsReadableStreamDefaultReader<Uint8Array>(reader)) {\n      assert(reader._readRequests.length === 0);\n      ReadableStreamReaderGenericRelease(reader);\n\n      reader = AcquireReadableStreamBYOBReader(stream);\n      forwardReaderError(reader);\n    }\n\n    const byobBranch = forBranch2 ? branch2 : branch1;\n    const otherBranch = forBranch2 ? branch1 : branch2;\n\n    const readIntoRequest: ReadIntoRequest<ArrayBufferView> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgainForBranch1 = false;\n          readAgainForBranch2 = false;\n\n          const byobCanceled = forBranch2 ? canceled2 : canceled1;\n          const otherCanceled = forBranch2 ? canceled1 : canceled2;\n\n          if (!otherCanceled) {\n            let clonedChunk;\n            try {\n              clonedChunk = CloneAsUint8Array(chunk);\n            } catch (cloneE) {\n              ReadableByteStreamControllerError(byobBranch._readableStreamController, cloneE);\n              ReadableByteStreamControllerError(otherBranch._readableStreamController, cloneE);\n              resolveCancelPromise(ReadableStreamCancel(stream, cloneE));\n              return;\n            }\n            if (!byobCanceled) {\n              ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n            }\n            ReadableByteStreamControllerEnqueue(otherBranch._readableStreamController, clonedChunk);\n          } else if (!byobCanceled) {\n            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n          }\n\n          reading = false;\n          if (readAgainForBranch1) {\n            pull1Algorithm();\n          } else if (readAgainForBranch2) {\n            pull2Algorithm();\n          }\n        });\n      },\n      _closeSteps: chunk => {\n        reading = false;\n\n        const byobCanceled = forBranch2 ? canceled2 : canceled1;\n        const otherCanceled = forBranch2 ? canceled1 : canceled2;\n\n        if (!byobCanceled) {\n          ReadableByteStreamControllerClose(byobBranch._readableStreamController);\n        }\n        if (!otherCanceled) {\n          ReadableByteStreamControllerClose(otherBranch._readableStreamController);\n        }\n\n        if (chunk !== undefined) {\n          assert(chunk.byteLength === 0);\n\n          if (!byobCanceled) {\n            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n          }\n          if (!otherCanceled && otherBranch._readableStreamController._pendingPullIntos.length > 0) {\n            ReadableByteStreamControllerRespond(otherBranch._readableStreamController, 0);\n          }\n        }\n\n        if (!byobCanceled || !otherCanceled) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamBYOBReaderRead(reader, view, readIntoRequest);\n  }\n\n  function pull1Algorithm(): Promise<void> {\n    if (reading) {\n      readAgainForBranch1 = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch1._readableStreamController);\n    if (byobRequest === null) {\n      pullWithDefaultReader();\n    } else {\n      pullWithBYOBReader(byobRequest._view!, false);\n    }\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function pull2Algorithm(): Promise<void> {\n    if (reading) {\n      readAgainForBranch2 = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch2._readableStreamController);\n    if (byobRequest === null) {\n      pullWithDefaultReader();\n    } else {\n      pullWithBYOBReader(byobRequest._view!, true);\n    }\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function cancel1Algorithm(reason: any): Promise<void> {\n    canceled1 = true;\n    reason1 = reason;\n    if (canceled2) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function cancel2Algorithm(reason: any): Promise<void> {\n    canceled2 = true;\n    reason2 = reason;\n    if (canceled1) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function startAlgorithm(): void {\n    return;\n  }\n\n  branch1 = CreateReadableByteStream(startAlgorithm, pull1Algorithm, cancel1Algorithm);\n  branch2 = CreateReadableByteStream(startAlgorithm, pull2Algorithm, cancel2Algorithm);\n\n  forwardReaderError(reader);\n\n  return [branch1, branch2];\n}\n","import { assertDictionary, assertFunction, convertUnsignedLongLongWithEnforceRange } from './basic';\nimport {\n  ReadableStreamController,\n  UnderlyingByteSource,\n  UnderlyingDefaultOrByteSource,\n  UnderlyingDefaultOrByteSourcePullCallback,\n  UnderlyingDefaultOrByteSourceStartCallback,\n  UnderlyingSource,\n  UnderlyingSourceCancelCallback,\n  ValidatedUnderlyingDefaultOrByteSource\n} from '../readable-stream/underlying-source';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\n\nexport function convertUnderlyingDefaultOrByteSource<R>(\n  source: UnderlyingSource<R> | UnderlyingByteSource | null,\n  context: string\n): ValidatedUnderlyingDefaultOrByteSource<R> {\n  assertDictionary(source, context);\n  const original = source as (UnderlyingDefaultOrByteSource<R> | null);\n  const autoAllocateChunkSize = original?.autoAllocateChunkSize;\n  const cancel = original?.cancel;\n  const pull = original?.pull;\n  const start = original?.start;\n  const type = original?.type;\n  return {\n    autoAllocateChunkSize: autoAllocateChunkSize === undefined ?\n      undefined :\n      convertUnsignedLongLongWithEnforceRange(\n        autoAllocateChunkSize,\n        `${context} has member 'autoAllocateChunkSize' that`\n      ),\n    cancel: cancel === undefined ?\n      undefined :\n      convertUnderlyingSourceCancelCallback(cancel, original!, `${context} has member 'cancel' that`),\n    pull: pull === undefined ?\n      undefined :\n      convertUnderlyingSourcePullCallback(pull, original!, `${context} has member 'pull' that`),\n    start: start === undefined ?\n      undefined :\n      convertUnderlyingSourceStartCallback(start, original!, `${context} has member 'start' that`),\n    type: type === undefined ? undefined : convertReadableStreamType(type, `${context} has member 'type' that`)\n  };\n}\n\nfunction convertUnderlyingSourceCancelCallback(\n  fn: UnderlyingSourceCancelCallback,\n  original: UnderlyingDefaultOrByteSource,\n  context: string\n): (reason: any) => Promise<void> {\n  assertFunction(fn, context);\n  return (reason: any) => promiseCall(fn, original, [reason]);\n}\n\nfunction convertUnderlyingSourcePullCallback<R>(\n  fn: UnderlyingDefaultOrByteSourcePullCallback<R>,\n  original: UnderlyingDefaultOrByteSource<R>,\n  context: string\n): (controller: ReadableStreamController<R>) => Promise<void> {\n  assertFunction(fn, context);\n  return (controller: ReadableStreamController<R>) => promiseCall(fn, original, [controller]);\n}\n\nfunction convertUnderlyingSourceStartCallback<R>(\n  fn: UnderlyingDefaultOrByteSourceStartCallback<R>,\n  original: UnderlyingDefaultOrByteSource<R>,\n  context: string\n): UnderlyingDefaultOrByteSourceStartCallback<R> {\n  assertFunction(fn, context);\n  return (controller: ReadableStreamController<R>) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertReadableStreamType(type: string, context: string): 'bytes' {\n  type = `${type}`;\n  if (type !== 'bytes') {\n    throw new TypeError(`${context} '${type}' is not a valid enumeration value for ReadableStreamType`);\n  }\n  return type;\n}\n","import { assertDictionary } from './basic';\nimport { ReadableStreamGetReaderOptions } from '../readable-stream/reader-options';\n\nexport function convertReaderOptions(options: ReadableStreamGetReaderOptions | null | undefined,\n                                     context: string): ReadableStreamGetReaderOptions {\n  assertDictionary(options, context);\n  const mode = options?.mode;\n  return {\n    mode: mode === undefined ? undefined : convertReadableStreamReaderMode(mode, `${context} has member 'mode' that`)\n  };\n}\n\nfunction convertReadableStreamReaderMode(mode: string, context: string): 'byob' {\n  mode = `${mode}`;\n  if (mode !== 'byob') {\n    throw new TypeError(`${context} '${mode}' is not a valid enumeration value for ReadableStreamReaderMode`);\n  }\n  return mode;\n}\n","import { assertDictionary } from './basic';\nimport {\n  ReadableStreamIteratorOptions,\n  ValidatedReadableStreamIteratorOptions\n} from '../readable-stream/iterator-options';\n\nexport function convertIteratorOptions(options: ReadableStreamIteratorOptions | null | undefined,\n                                       context: string): ValidatedReadableStreamIteratorOptions {\n  assertDictionary(options, context);\n  const preventCancel = options?.preventCancel;\n  return { preventCancel: Boolean(preventCancel) };\n}\n","import { assertDictionary } from './basic';\nimport { StreamPipeOptions, ValidatedStreamPipeOptions } from '../readable-stream/pipe-options';\nimport { AbortSignal, isAbortSignal } from '../abort-signal';\n\nexport function convertPipeOptions(options: StreamPipeOptions | null | undefined,\n                                   context: string): ValidatedStreamPipeOptions {\n  assertDictionary(options, context);\n  const preventAbort = options?.preventAbort;\n  const preventCancel = options?.preventCancel;\n  const preventClose = options?.preventClose;\n  const signal = options?.signal;\n  if (signal !== undefined) {\n    assertAbortSignal(signal, `${context} has member 'signal' that`);\n  }\n  return {\n    preventAbort: Boolean(preventAbort),\n    preventCancel: Boolean(preventCancel),\n    preventClose: Boolean(preventClose),\n    signal\n  };\n}\n\nfunction assertAbortSignal(signal: unknown, context: string): asserts signal is AbortSignal {\n  if (!isAbortSignal(signal)) {\n    throw new TypeError(`${context} is not an AbortSignal.`);\n  }\n}\n","import { assertDictionary, assertRequiredField } from './basic';\nimport { ReadableStream } from '../readable-stream';\nimport { WritableStream } from '../writable-stream';\nimport { assertReadableStream } from './readable-stream';\nimport { assertWritableStream } from './writable-stream';\n\nexport function convertReadableWritablePair<RS extends ReadableStream, WS extends WritableStream>(\n  pair: { readable: RS; writable: WS } | null | undefined,\n  context: string\n): { readable: RS; writable: WS } {\n  assertDictionary(pair, context);\n\n  const readable = pair?.readable;\n  assertRequiredField(readable, 'readable', 'ReadableWritablePair');\n  assertReadableStream(readable, `${context} has member 'readable' that`);\n\n  const writable = pair?.writable;\n  assertRequiredField(writable, 'writable', 'ReadableWritablePair');\n  assertWritableStream(writable, `${context} has member 'writable' that`);\n\n  return { readable, writable };\n}\n","import assert from '../stub/assert';\nimport {\n  promiseRejectedWith,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  transformPromiseWith\n} from './helpers/webidl';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { AcquireReadableStreamAsyncIterator, ReadableStreamAsyncIterator } from './readable-stream/async-iterator';\nimport { defaultReaderClosedPromiseReject, defaultReaderClosedPromiseResolve } from './readable-stream/generic-reader';\nimport {\n  AcquireReadableStreamDefaultReader,\n  IsReadableStreamDefaultReader,\n  ReadableStreamDefaultReader,\n  ReadableStreamDefaultReadResult\n} from './readable-stream/default-reader';\nimport {\n  AcquireReadableStreamBYOBReader,\n  IsReadableStreamBYOBReader,\n  ReadableStreamBYOBReader,\n  ReadableStreamBYOBReadResult\n} from './readable-stream/byob-reader';\nimport { ReadableStreamPipeTo } from './readable-stream/pipe';\nimport { ReadableStreamTee } from './readable-stream/tee';\nimport { IsWritableStream, IsWritableStreamLocked, WritableStream } from './writable-stream';\nimport { SimpleQueue } from './simple-queue';\nimport {\n  ReadableByteStreamController,\n  ReadableStreamBYOBRequest,\n  SetUpReadableByteStreamController,\n  SetUpReadableByteStreamControllerFromUnderlyingSource\n} from './readable-stream/byte-stream-controller';\nimport {\n  ReadableStreamDefaultController,\n  SetUpReadableStreamDefaultController,\n  SetUpReadableStreamDefaultControllerFromUnderlyingSource\n} from './readable-stream/default-controller';\nimport {\n  UnderlyingByteSource,\n  UnderlyingByteSourcePullCallback,\n  UnderlyingByteSourceStartCallback,\n  UnderlyingSource,\n  UnderlyingSourceCancelCallback,\n  UnderlyingSourcePullCallback,\n  UnderlyingSourceStartCallback\n} from './readable-stream/underlying-source';\nimport { noop } from '../utils';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { CreateArrayFromList } from './abstract-ops/ecmascript';\nimport { CancelSteps } from './abstract-ops/internal-methods';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { assertObject, assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport { convertUnderlyingDefaultOrByteSource } from './validators/underlying-source';\nimport { ReadableStreamGetReaderOptions } from './readable-stream/reader-options';\nimport { convertReaderOptions } from './validators/reader-options';\nimport { StreamPipeOptions, ValidatedStreamPipeOptions } from './readable-stream/pipe-options';\nimport { ReadableStreamIteratorOptions } from './readable-stream/iterator-options';\nimport { convertIteratorOptions } from './validators/iterator-options';\nimport { convertPipeOptions } from './validators/pipe-options';\nimport { ReadableWritablePair } from './readable-stream/readable-writable-pair';\nimport { convertReadableWritablePair } from './validators/readable-writable-pair';\n\nexport type ReadableByteStream = ReadableStream<Uint8Array> & {\n  _readableStreamController: ReadableByteStreamController\n};\n\ntype ReadableStreamState = 'readable' | 'closed' | 'errored';\n\n/**\n * A readable stream represents a source of data, from which you can read.\n *\n * @public\n */\nexport class ReadableStream<R = any> {\n  /** @internal */\n  _state!: ReadableStreamState;\n  /** @internal */\n  _reader: ReadableStreamReader<R> | undefined;\n  /** @internal */\n  _storedError: any;\n  /** @internal */\n  _disturbed!: boolean;\n  /** @internal */\n  _readableStreamController!: ReadableStreamDefaultController<R> | ReadableByteStreamController;\n\n  constructor(underlyingSource: UnderlyingByteSource, strategy?: { highWaterMark?: number; size?: undefined });\n  constructor(underlyingSource?: UnderlyingSource<R>, strategy?: QueuingStrategy<R>);\n  constructor(rawUnderlyingSource: UnderlyingSource<R> | UnderlyingByteSource | null | undefined = {},\n              rawStrategy: QueuingStrategy<R> | null | undefined = {}) {\n    if (rawUnderlyingSource === undefined) {\n      rawUnderlyingSource = null;\n    } else {\n      assertObject(rawUnderlyingSource, 'First parameter');\n    }\n\n    const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');\n    const underlyingSource = convertUnderlyingDefaultOrByteSource(rawUnderlyingSource, 'First parameter');\n\n    InitializeReadableStream(this);\n\n    if (underlyingSource.type === 'bytes') {\n      if (strategy.size !== undefined) {\n        throw new RangeError('The strategy for a byte stream cannot have a size function');\n      }\n      const highWaterMark = ExtractHighWaterMark(strategy, 0);\n      SetUpReadableByteStreamControllerFromUnderlyingSource(\n        this as unknown as ReadableByteStream,\n        underlyingSource,\n        highWaterMark\n      );\n    } else {\n      assert(underlyingSource.type === undefined);\n      const sizeAlgorithm = ExtractSizeAlgorithm(strategy);\n      const highWaterMark = ExtractHighWaterMark(strategy, 1);\n      SetUpReadableStreamDefaultControllerFromUnderlyingSource(\n        this,\n        underlyingSource,\n        highWaterMark,\n        sizeAlgorithm\n      );\n    }\n  }\n\n  /**\n   * Whether or not the readable stream is locked to a {@link ReadableStreamDefaultReader | reader}.\n   */\n  get locked(): boolean {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('locked');\n    }\n\n    return IsReadableStreamLocked(this);\n  }\n\n  /**\n   * Cancels the stream, signaling a loss of interest in the stream by a consumer.\n   *\n   * The supplied `reason` argument will be given to the underlying source's {@link UnderlyingSource.cancel | cancel()}\n   * method, which might or might not use it.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('cancel'));\n    }\n\n    if (IsReadableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot cancel a stream that already has a reader'));\n    }\n\n    return ReadableStreamCancel(this, reason);\n  }\n\n  /**\n   * Creates a {@link ReadableStreamBYOBReader} and locks the stream to the new reader.\n   *\n   * This call behaves the same way as the no-argument variant, except that it only works on readable byte streams,\n   * i.e. streams which were constructed specifically with the ability to handle \"bring your own buffer\" reading.\n   * The returned BYOB reader provides the ability to directly read individual chunks from the stream via its\n   * {@link ReadableStreamBYOBReader.read | read()} method, into developer-supplied buffers, allowing more precise\n   * control over allocation.\n   */\n  getReader({ mode }: { mode: 'byob' }): ReadableStreamBYOBReader;\n  /**\n   * Creates a {@link ReadableStreamDefaultReader} and locks the stream to the new reader.\n   * While the stream is locked, no other reader can be acquired until this one is released.\n   *\n   * This functionality is especially useful for creating abstractions that desire the ability to consume a stream\n   * in its entirety. By getting a reader for the stream, you can ensure nobody else can interleave reads with yours\n   * or cancel the stream, which would interfere with your abstraction.\n   */\n  getReader(): ReadableStreamDefaultReader<R>;\n  getReader(\n    rawOptions: ReadableStreamGetReaderOptions | null | undefined = undefined\n  ): ReadableStreamDefaultReader<R> | ReadableStreamBYOBReader {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('getReader');\n    }\n\n    const options = convertReaderOptions(rawOptions, 'First parameter');\n\n    if (options.mode === undefined) {\n      return AcquireReadableStreamDefaultReader(this);\n    }\n\n    assert(options.mode === 'byob');\n    return AcquireReadableStreamBYOBReader(this as unknown as ReadableByteStream);\n  }\n\n  /**\n   * Provides a convenient, chainable way of piping this readable stream through a transform stream\n   * (or any other `{ writable, readable }` pair). It simply {@link ReadableStream.pipeTo | pipes} the stream\n   * into the writable side of the supplied pair, and returns the readable side for further use.\n   *\n   * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.\n   */\n  pipeThrough<RS extends ReadableStream>(\n    transform: { readable: RS; writable: WritableStream<R> },\n    options?: StreamPipeOptions\n  ): RS;\n  pipeThrough<RS extends ReadableStream>(\n    rawTransform: { readable: RS; writable: WritableStream<R> } | null | undefined,\n    rawOptions: StreamPipeOptions | null | undefined = {}\n  ): RS {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('pipeThrough');\n    }\n    assertRequiredArgument(rawTransform, 1, 'pipeThrough');\n\n    const transform = convertReadableWritablePair(rawTransform, 'First parameter');\n    const options = convertPipeOptions(rawOptions, 'Second parameter');\n\n    if (IsReadableStreamLocked(this)) {\n      throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked ReadableStream');\n    }\n    if (IsWritableStreamLocked(transform.writable)) {\n      throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked WritableStream');\n    }\n\n    const promise = ReadableStreamPipeTo(\n      this, transform.writable, options.preventClose, options.preventAbort, options.preventCancel, options.signal\n    );\n\n    setPromiseIsHandledToTrue(promise);\n\n    return transform.readable;\n  }\n\n  /**\n   * Pipes this readable stream to a given writable stream. The way in which the piping process behaves under\n   * various error conditions can be customized with a number of passed options. It returns a promise that fulfills\n   * when the piping process completes successfully, or rejects if any errors were encountered.\n   *\n   * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.\n   */\n  pipeTo(destination: WritableStream<R>, options?: StreamPipeOptions): Promise<void>;\n  pipeTo(destination: WritableStream<R> | null | undefined,\n         rawOptions: StreamPipeOptions | null | undefined = {}): Promise<void> {\n    if (!IsReadableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('pipeTo'));\n    }\n\n    if (destination === undefined) {\n      return promiseRejectedWith(`Parameter 1 is required in 'pipeTo'.`);\n    }\n    if (!IsWritableStream(destination)) {\n      return promiseRejectedWith(\n        new TypeError(`ReadableStream.prototype.pipeTo's first argument must be a WritableStream`)\n      );\n    }\n\n    let options: ValidatedStreamPipeOptions;\n    try {\n      options = convertPipeOptions(rawOptions, 'Second parameter');\n    } catch (e) {\n      return promiseRejectedWith(e);\n    }\n\n    if (IsReadableStreamLocked(this)) {\n      return promiseRejectedWith(\n        new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream')\n      );\n    }\n    if (IsWritableStreamLocked(destination)) {\n      return promiseRejectedWith(\n        new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream')\n      );\n    }\n\n    return ReadableStreamPipeTo<R>(\n      this, destination, options.preventClose, options.preventAbort, options.preventCancel, options.signal\n    );\n  }\n\n  /**\n   * Tees this readable stream, returning a two-element array containing the two resulting branches as\n   * new {@link ReadableStream} instances.\n   *\n   * Teeing a stream will lock it, preventing any other consumer from acquiring a reader.\n   * To cancel the stream, cancel both of the resulting branches; a composite cancellation reason will then be\n   * propagated to the stream's underlying source.\n   *\n   * Note that the chunks seen in each branch will be the same object. If the chunks are not immutable,\n   * this could allow interference between the two branches.\n   */\n  tee(): [ReadableStream<R>, ReadableStream<R>] {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('tee');\n    }\n\n    const branches = ReadableStreamTee(this, false);\n    return CreateArrayFromList(branches);\n  }\n\n  /**\n   * Asynchronously iterates over the chunks in the stream's internal queue.\n   *\n   * Asynchronously iterating over the stream will lock it, preventing any other consumer from acquiring a reader.\n   * The lock will be released if the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method\n   * is called, e.g. by breaking out of the loop.\n   *\n   * By default, calling the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method will also\n   * cancel the stream. To prevent this, use the stream's {@link ReadableStream.values | values()} method, passing\n   * `true` for the `preventCancel` option.\n   */\n  values(options?: ReadableStreamIteratorOptions): ReadableStreamAsyncIterator<R>;\n  values(rawOptions: ReadableStreamIteratorOptions | null | undefined = undefined): ReadableStreamAsyncIterator<R> {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('values');\n    }\n\n    const options = convertIteratorOptions(rawOptions, 'First parameter');\n    return AcquireReadableStreamAsyncIterator<R>(this, options.preventCancel);\n  }\n\n  /**\n   * {@inheritDoc ReadableStream.values}\n   */\n  [Symbol.asyncIterator]: (options?: ReadableStreamIteratorOptions) => ReadableStreamAsyncIterator<R>;\n}\n\nObject.defineProperties(ReadableStream.prototype, {\n  cancel: { enumerable: true },\n  getReader: { enumerable: true },\n  pipeThrough: { enumerable: true },\n  pipeTo: { enumerable: true },\n  tee: { enumerable: true },\n  values: { enumerable: true },\n  locked: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStream.prototype, Symbol.toStringTag, {\n    value: 'ReadableStream',\n    configurable: true\n  });\n}\nif (typeof Symbol.asyncIterator === 'symbol') {\n  Object.defineProperty(ReadableStream.prototype, Symbol.asyncIterator, {\n    value: ReadableStream.prototype.values,\n    writable: true,\n    configurable: true\n  });\n}\n\nexport {\n  ReadableStreamAsyncIterator,\n  ReadableStreamDefaultReadResult,\n  ReadableStreamBYOBReadResult,\n  UnderlyingByteSource,\n  UnderlyingSource,\n  UnderlyingSourceStartCallback,\n  UnderlyingSourcePullCallback,\n  UnderlyingSourceCancelCallback,\n  UnderlyingByteSourceStartCallback,\n  UnderlyingByteSourcePullCallback,\n  StreamPipeOptions,\n  ReadableWritablePair,\n  ReadableStreamIteratorOptions\n};\n\n// Abstract operations for the ReadableStream.\n\n// Throws if and only if startAlgorithm throws.\nexport function CreateReadableStream<R>(startAlgorithm: () => void | PromiseLike<void>,\n                                        pullAlgorithm: () => Promise<void>,\n                                        cancelAlgorithm: (reason: any) => Promise<void>,\n                                        highWaterMark = 1,\n                                        sizeAlgorithm: QueuingStrategySizeCallback<R> = () => 1): ReadableStream<R> {\n  assert(IsNonNegativeNumber(highWaterMark));\n\n  const stream: ReadableStream<R> = Object.create(ReadableStream.prototype);\n  InitializeReadableStream(stream);\n\n  const controller: ReadableStreamDefaultController<R> = Object.create(ReadableStreamDefaultController.prototype);\n  SetUpReadableStreamDefaultController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm\n  );\n\n  return stream;\n}\n\n// Throws if and only if startAlgorithm throws.\nexport function CreateReadableByteStream(\n  startAlgorithm: () => void | PromiseLike<void>,\n  pullAlgorithm: () => Promise<void>,\n  cancelAlgorithm: (reason: any) => Promise<void>\n): ReadableByteStream {\n  const stream: ReadableByteStream = Object.create(ReadableStream.prototype);\n  InitializeReadableStream(stream);\n\n  const controller: ReadableByteStreamController = Object.create(ReadableByteStreamController.prototype);\n  SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, 0, undefined);\n\n  return stream;\n}\n\nfunction InitializeReadableStream(stream: ReadableStream) {\n  stream._state = 'readable';\n  stream._reader = undefined;\n  stream._storedError = undefined;\n  stream._disturbed = false;\n}\n\nexport function IsReadableStream(x: unknown): x is ReadableStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readableStreamController')) {\n    return false;\n  }\n\n  return x instanceof ReadableStream;\n}\n\nexport function IsReadableStreamDisturbed(stream: ReadableStream): boolean {\n  assert(IsReadableStream(stream));\n\n  return stream._disturbed;\n}\n\nexport function IsReadableStreamLocked(stream: ReadableStream): boolean {\n  assert(IsReadableStream(stream));\n\n  if (stream._reader === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamCancel<R>(stream: ReadableStream<R>, reason: any): Promise<undefined> {\n  stream._disturbed = true;\n\n  if (stream._state === 'closed') {\n    return promiseResolvedWith(undefined);\n  }\n  if (stream._state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  ReadableStreamClose(stream);\n\n  const reader = stream._reader;\n  if (reader !== undefined && IsReadableStreamBYOBReader(reader)) {\n    reader._readIntoRequests.forEach(readIntoRequest => {\n      readIntoRequest._closeSteps(undefined);\n    });\n    reader._readIntoRequests = new SimpleQueue();\n  }\n\n  const sourceCancelPromise = stream._readableStreamController[CancelSteps](reason);\n  return transformPromiseWith(sourceCancelPromise, noop);\n}\n\nexport function ReadableStreamClose<R>(stream: ReadableStream<R>): void {\n  assert(stream._state === 'readable');\n\n  stream._state = 'closed';\n\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return;\n  }\n\n  defaultReaderClosedPromiseResolve(reader);\n\n  if (IsReadableStreamDefaultReader<R>(reader)) {\n    reader._readRequests.forEach(readRequest => {\n      readRequest._closeSteps();\n    });\n    reader._readRequests = new SimpleQueue();\n  }\n}\n\nexport function ReadableStreamError<R>(stream: ReadableStream<R>, e: any): void {\n  assert(IsReadableStream(stream));\n  assert(stream._state === 'readable');\n\n  stream._state = 'errored';\n  stream._storedError = e;\n\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return;\n  }\n\n  defaultReaderClosedPromiseReject(reader, e);\n\n  if (IsReadableStreamDefaultReader<R>(reader)) {\n    reader._readRequests.forEach(readRequest => {\n      readRequest._errorSteps(e);\n    });\n\n    reader._readRequests = new SimpleQueue();\n  } else {\n    assert(IsReadableStreamBYOBReader(reader));\n\n    reader._readIntoRequests.forEach(readIntoRequest => {\n      readIntoRequest._errorSteps(e);\n    });\n\n    reader._readIntoRequests = new SimpleQueue();\n  }\n}\n\n// Readers\n\nexport type ReadableStreamReader<R> = ReadableStreamDefaultReader<R> | ReadableStreamBYOBReader;\n\nexport {\n  ReadableStreamDefaultReader,\n  ReadableStreamBYOBReader\n};\n\n// Controllers\n\nexport {\n  ReadableStreamDefaultController,\n  ReadableStreamBYOBRequest,\n  ReadableByteStreamController\n};\n\n// Helper functions for the ReadableStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(`ReadableStream.prototype.${name} can only be used on a ReadableStream`);\n}\n","import { QueuingStrategyInit } from '../queuing-strategy';\nimport { assertDictionary, assertRequiredField, convertUnrestrictedDouble } from './basic';\n\nexport function convertQueuingStrategyInit(init: QueuingStrategyInit | null | undefined,\n                                           context: string): QueuingStrategyInit {\n  assertDictionary(init, context);\n  const highWaterMark = init?.highWaterMark;\n  assertRequiredField(highWaterMark, 'highWaterMark', 'QueuingStrategyInit');\n  return {\n    highWaterMark: convertUnrestrictedDouble(highWaterMark)\n  };\n}\n","import { QueuingStrategy, QueuingStrategyInit } from './queuing-strategy';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategyInit } from './validators/queuing-strategy-init';\n\n// The size function must not have a prototype property nor be a constructor\nconst byteLengthSizeFunction = (chunk: ArrayBufferView): number => {\n  return chunk.byteLength;\n};\ntry {\n  Object.defineProperty(byteLengthSizeFunction, 'name', {\n    value: 'size',\n    configurable: true\n  });\n} catch {\n  // This property is non-configurable in older browsers, so ignore if this throws.\n  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility\n}\n\n/**\n * A queuing strategy that counts the number of bytes in each chunk.\n *\n * @public\n */\nexport default class ByteLengthQueuingStrategy implements QueuingStrategy<ArrayBufferView> {\n  /** @internal */\n  readonly _byteLengthQueuingStrategyHighWaterMark: number;\n\n  constructor(options: QueuingStrategyInit) {\n    assertRequiredArgument(options, 1, 'ByteLengthQueuingStrategy');\n    options = convertQueuingStrategyInit(options, 'First parameter');\n    this._byteLengthQueuingStrategyHighWaterMark = options.highWaterMark;\n  }\n\n  /**\n   * Returns the high water mark provided to the constructor.\n   */\n  get highWaterMark(): number {\n    if (!IsByteLengthQueuingStrategy(this)) {\n      throw byteLengthBrandCheckException('highWaterMark');\n    }\n    return this._byteLengthQueuingStrategyHighWaterMark;\n  }\n\n  /**\n   * Measures the size of `chunk` by returning the value of its `byteLength` property.\n   */\n  get size(): (chunk: ArrayBufferView) => number {\n    if (!IsByteLengthQueuingStrategy(this)) {\n      throw byteLengthBrandCheckException('size');\n    }\n    return byteLengthSizeFunction;\n  }\n}\n\nObject.defineProperties(ByteLengthQueuingStrategy.prototype, {\n  highWaterMark: { enumerable: true },\n  size: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ByteLengthQueuingStrategy.prototype, Symbol.toStringTag, {\n    value: 'ByteLengthQueuingStrategy',\n    configurable: true\n  });\n}\n\n// Helper functions for the ByteLengthQueuingStrategy.\n\nfunction byteLengthBrandCheckException(name: string): TypeError {\n  return new TypeError(`ByteLengthQueuingStrategy.prototype.${name} can only be used on a ByteLengthQueuingStrategy`);\n}\n\nexport function IsByteLengthQueuingStrategy(x: any): x is ByteLengthQueuingStrategy {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_byteLengthQueuingStrategyHighWaterMark')) {\n    return false;\n  }\n\n  return x instanceof ByteLengthQueuingStrategy;\n}\n","import { QueuingStrategy, QueuingStrategyInit } from './queuing-strategy';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategyInit } from './validators/queuing-strategy-init';\n\n// The size function must not have a prototype property nor be a constructor\nconst countSizeFunction = (): 1 => {\n  return 1;\n};\ntry {\n  Object.defineProperty(countSizeFunction, 'name', {\n    value: 'size',\n    configurable: true\n  });\n} catch {\n  // This property is non-configurable in older browsers, so ignore if this throws.\n  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility\n}\n\n/**\n * A queuing strategy that counts the number of chunks.\n *\n * @public\n */\nexport default class CountQueuingStrategy implements QueuingStrategy<any> {\n  /** @internal */\n  readonly _countQueuingStrategyHighWaterMark!: number;\n\n  constructor(options: QueuingStrategyInit) {\n    assertRequiredArgument(options, 1, 'CountQueuingStrategy');\n    options = convertQueuingStrategyInit(options, 'First parameter');\n    this._countQueuingStrategyHighWaterMark = options.highWaterMark;\n  }\n\n  /**\n   * Returns the high water mark provided to the constructor.\n   */\n  get highWaterMark(): number {\n    if (!IsCountQueuingStrategy(this)) {\n      throw countBrandCheckException('highWaterMark');\n    }\n    return this._countQueuingStrategyHighWaterMark;\n  }\n\n  /**\n   * Measures the size of `chunk` by always returning 1.\n   * This ensures that the total queue size is a count of the number of chunks in the queue.\n   */\n  get size(): (chunk: any) => 1 {\n    if (!IsCountQueuingStrategy(this)) {\n      throw countBrandCheckException('size');\n    }\n    return countSizeFunction;\n  }\n}\n\nObject.defineProperties(CountQueuingStrategy.prototype, {\n  highWaterMark: { enumerable: true },\n  size: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(CountQueuingStrategy.prototype, Symbol.toStringTag, {\n    value: 'CountQueuingStrategy',\n    configurable: true\n  });\n}\n\n// Helper functions for the CountQueuingStrategy.\n\nfunction countBrandCheckException(name: string): TypeError {\n  return new TypeError(`CountQueuingStrategy.prototype.${name} can only be used on a CountQueuingStrategy`);\n}\n\nexport function IsCountQueuingStrategy(x: any): x is CountQueuingStrategy {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_countQueuingStrategyHighWaterMark')) {\n    return false;\n  }\n\n  return x instanceof CountQueuingStrategy;\n}\n","import { assertDictionary, assertFunction } from './basic';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\nimport {\n  Transformer,\n  TransformerFlushCallback,\n  TransformerStartCallback,\n  TransformerTransformCallback,\n  ValidatedTransformer\n} from '../transform-stream/transformer';\nimport { TransformStreamDefaultController } from '../transform-stream';\n\nexport function convertTransformer<I, O>(original: Transformer<I, O> | null,\n                                         context: string): ValidatedTransformer<I, O> {\n  assertDictionary(original, context);\n  const flush = original?.flush;\n  const readableType = original?.readableType;\n  const start = original?.start;\n  const transform = original?.transform;\n  const writableType = original?.writableType;\n  return {\n    flush: flush === undefined ?\n      undefined :\n      convertTransformerFlushCallback(flush, original!, `${context} has member 'flush' that`),\n    readableType,\n    start: start === undefined ?\n      undefined :\n      convertTransformerStartCallback(start, original!, `${context} has member 'start' that`),\n    transform: transform === undefined ?\n      undefined :\n      convertTransformerTransformCallback(transform, original!, `${context} has member 'transform' that`),\n    writableType\n  };\n}\n\nfunction convertTransformerFlushCallback<I, O>(\n  fn: TransformerFlushCallback<O>,\n  original: Transformer<I, O>,\n  context: string\n): (controller: TransformStreamDefaultController<O>) => Promise<void> {\n  assertFunction(fn, context);\n  return (controller: TransformStreamDefaultController<O>) => promiseCall(fn, original, [controller]);\n}\n\nfunction convertTransformerStartCallback<I, O>(\n  fn: TransformerStartCallback<O>,\n  original: Transformer<I, O>,\n  context: string\n): TransformerStartCallback<O> {\n  assertFunction(fn, context);\n  return (controller: TransformStreamDefaultController<O>) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertTransformerTransformCallback<I, O>(\n  fn: TransformerTransformCallback<I, O>,\n  original: Transformer<I, O>,\n  context: string\n): (chunk: I, controller: TransformStreamDefaultController<O>) => Promise<void> {\n  assertFunction(fn, context);\n  return (chunk: I, controller: TransformStreamDefaultController<O>) => promiseCall(fn, original, [chunk, controller]);\n}\n","import assert from '../stub/assert';\nimport { newPromise, promiseRejectedWith, promiseResolvedWith, transformPromiseWith } from './helpers/webidl';\nimport { CreateReadableStream, ReadableStream, ReadableStreamDefaultController } from './readable-stream';\nimport {\n  ReadableStreamDefaultControllerCanCloseOrEnqueue,\n  ReadableStreamDefaultControllerClose,\n  ReadableStreamDefaultControllerEnqueue,\n  ReadableStreamDefaultControllerError,\n  ReadableStreamDefaultControllerGetDesiredSize,\n  ReadableStreamDefaultControllerHasBackpressure\n} from './readable-stream/default-controller';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { CreateWritableStream, WritableStream, WritableStreamDefaultControllerErrorIfNeeded } from './writable-stream';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport {\n  Transformer,\n  TransformerFlushCallback,\n  TransformerStartCallback,\n  TransformerTransformCallback,\n  ValidatedTransformer\n} from './transform-stream/transformer';\nimport { convertTransformer } from './validators/transformer';\n\n// Class TransformStream\n\n/**\n * A transform stream consists of a pair of streams: a {@link WritableStream | writable stream},\n * known as its writable side, and a {@link ReadableStream | readable stream}, known as its readable side.\n * In a manner specific to the transform stream in question, writes to the writable side result in new data being\n * made available for reading from the readable side.\n *\n * @public\n */\nexport class TransformStream<I = any, O = any> {\n  /** @internal */\n  _writable!: WritableStream<I>;\n  /** @internal */\n  _readable!: ReadableStream<O>;\n  /** @internal */\n  _backpressure!: boolean;\n  /** @internal */\n  _backpressureChangePromise!: Promise<void>;\n  /** @internal */\n  _backpressureChangePromise_resolve!: () => void;\n  /** @internal */\n  _transformStreamController!: TransformStreamDefaultController<O>;\n\n  constructor(\n    transformer?: Transformer<I, O>,\n    writableStrategy?: QueuingStrategy<I>,\n    readableStrategy?: QueuingStrategy<O>\n  );\n  constructor(rawTransformer: Transformer<I, O> | null | undefined = {},\n              rawWritableStrategy: QueuingStrategy<I> | null | undefined = {},\n              rawReadableStrategy: QueuingStrategy<O> | null | undefined = {}) {\n    if (rawTransformer === undefined) {\n      rawTransformer = null;\n    }\n\n    const writableStrategy = convertQueuingStrategy(rawWritableStrategy, 'Second parameter');\n    const readableStrategy = convertQueuingStrategy(rawReadableStrategy, 'Third parameter');\n\n    const transformer = convertTransformer(rawTransformer, 'First parameter');\n    if (transformer.readableType !== undefined) {\n      throw new RangeError('Invalid readableType specified');\n    }\n    if (transformer.writableType !== undefined) {\n      throw new RangeError('Invalid writableType specified');\n    }\n\n    const readableHighWaterMark = ExtractHighWaterMark(readableStrategy, 0);\n    const readableSizeAlgorithm = ExtractSizeAlgorithm(readableStrategy);\n    const writableHighWaterMark = ExtractHighWaterMark(writableStrategy, 1);\n    const writableSizeAlgorithm = ExtractSizeAlgorithm(writableStrategy);\n\n    let startPromise_resolve!: (value: void | PromiseLike<void>) => void;\n    const startPromise = newPromise<void>(resolve => {\n      startPromise_resolve = resolve;\n    });\n\n    InitializeTransformStream(\n      this, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm\n    );\n    SetUpTransformStreamDefaultControllerFromTransformer(this, transformer);\n\n    if (transformer.start !== undefined) {\n      startPromise_resolve(transformer.start(this._transformStreamController));\n    } else {\n      startPromise_resolve(undefined);\n    }\n  }\n\n  /**\n   * The readable side of the transform stream.\n   */\n  get readable(): ReadableStream<O> {\n    if (!IsTransformStream(this)) {\n      throw streamBrandCheckException('readable');\n    }\n\n    return this._readable;\n  }\n\n  /**\n   * The writable side of the transform stream.\n   */\n  get writable(): WritableStream<I> {\n    if (!IsTransformStream(this)) {\n      throw streamBrandCheckException('writable');\n    }\n\n    return this._writable;\n  }\n}\n\nObject.defineProperties(TransformStream.prototype, {\n  readable: { enumerable: true },\n  writable: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(TransformStream.prototype, Symbol.toStringTag, {\n    value: 'TransformStream',\n    configurable: true\n  });\n}\n\nexport {\n  Transformer,\n  TransformerStartCallback,\n  TransformerFlushCallback,\n  TransformerTransformCallback\n};\n\n// Transform Stream Abstract Operations\n\nexport function CreateTransformStream<I, O>(startAlgorithm: () => void | PromiseLike<void>,\n                                            transformAlgorithm: (chunk: I) => Promise<void>,\n                                            flushAlgorithm: () => Promise<void>,\n                                            writableHighWaterMark = 1,\n                                            writableSizeAlgorithm: QueuingStrategySizeCallback<I> = () => 1,\n                                            readableHighWaterMark = 0,\n                                            readableSizeAlgorithm: QueuingStrategySizeCallback<O> = () => 1) {\n  assert(IsNonNegativeNumber(writableHighWaterMark));\n  assert(IsNonNegativeNumber(readableHighWaterMark));\n\n  const stream: TransformStream<I, O> = Object.create(TransformStream.prototype);\n\n  let startPromise_resolve!: (value: void | PromiseLike<void>) => void;\n  const startPromise = newPromise<void>(resolve => {\n    startPromise_resolve = resolve;\n  });\n\n  InitializeTransformStream(stream, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark,\n                            readableSizeAlgorithm);\n\n  const controller: TransformStreamDefaultController<O> = Object.create(TransformStreamDefaultController.prototype);\n\n  SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);\n\n  const startResult = startAlgorithm();\n  startPromise_resolve(startResult);\n  return stream;\n}\n\nfunction InitializeTransformStream<I, O>(stream: TransformStream<I, O>,\n                                         startPromise: Promise<void>,\n                                         writableHighWaterMark: number,\n                                         writableSizeAlgorithm: QueuingStrategySizeCallback<I>,\n                                         readableHighWaterMark: number,\n                                         readableSizeAlgorithm: QueuingStrategySizeCallback<O>) {\n  function startAlgorithm(): Promise<void> {\n    return startPromise;\n  }\n\n  function writeAlgorithm(chunk: I): Promise<void> {\n    return TransformStreamDefaultSinkWriteAlgorithm(stream, chunk);\n  }\n\n  function abortAlgorithm(reason: any): Promise<void> {\n    return TransformStreamDefaultSinkAbortAlgorithm(stream, reason);\n  }\n\n  function closeAlgorithm(): Promise<void> {\n    return TransformStreamDefaultSinkCloseAlgorithm(stream);\n  }\n\n  stream._writable = CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm,\n                                          writableHighWaterMark, writableSizeAlgorithm);\n\n  function pullAlgorithm(): Promise<void> {\n    return TransformStreamDefaultSourcePullAlgorithm(stream);\n  }\n\n  function cancelAlgorithm(reason: any): Promise<void> {\n    TransformStreamErrorWritableAndUnblockWrite(stream, reason);\n    return promiseResolvedWith(undefined);\n  }\n\n  stream._readable = CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, readableHighWaterMark,\n                                          readableSizeAlgorithm);\n\n  // The [[backpressure]] slot is set to undefined so that it can be initialised by TransformStreamSetBackpressure.\n  stream._backpressure = undefined!;\n  stream._backpressureChangePromise = undefined!;\n  stream._backpressureChangePromise_resolve = undefined!;\n  TransformStreamSetBackpressure(stream, true);\n\n  stream._transformStreamController = undefined!;\n}\n\nfunction IsTransformStream(x: unknown): x is TransformStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_transformStreamController')) {\n    return false;\n  }\n\n  return x instanceof TransformStream;\n}\n\n// This is a no-op if both sides are already errored.\nfunction TransformStreamError(stream: TransformStream, e: any) {\n  ReadableStreamDefaultControllerError(\n    stream._readable._readableStreamController as ReadableStreamDefaultController<any>,\n    e\n  );\n  TransformStreamErrorWritableAndUnblockWrite(stream, e);\n}\n\nfunction TransformStreamErrorWritableAndUnblockWrite(stream: TransformStream, e: any) {\n  TransformStreamDefaultControllerClearAlgorithms(stream._transformStreamController);\n  WritableStreamDefaultControllerErrorIfNeeded(stream._writable._writableStreamController, e);\n  if (stream._backpressure) {\n    // Pretend that pull() was called to permit any pending write() calls to complete. TransformStreamSetBackpressure()\n    // cannot be called from enqueue() or pull() once the ReadableStream is errored, so this will will be the final time\n    // _backpressure is set.\n    TransformStreamSetBackpressure(stream, false);\n  }\n}\n\nfunction TransformStreamSetBackpressure(stream: TransformStream, backpressure: boolean) {\n  // Passes also when called during construction.\n  assert(stream._backpressure !== backpressure);\n\n  if (stream._backpressureChangePromise !== undefined) {\n    stream._backpressureChangePromise_resolve();\n  }\n\n  stream._backpressureChangePromise = newPromise(resolve => {\n    stream._backpressureChangePromise_resolve = resolve;\n  });\n\n  stream._backpressure = backpressure;\n}\n\n// Class TransformStreamDefaultController\n\n/**\n * Allows control of the {@link ReadableStream} and {@link WritableStream} of the associated {@link TransformStream}.\n *\n * @public\n */\nexport class TransformStreamDefaultController<O> {\n  /** @internal */\n  _controlledTransformStream: TransformStream<any, O>;\n  /** @internal */\n  _transformAlgorithm: (chunk: any) => Promise<void>;\n  /** @internal */\n  _flushAlgorithm: () => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the desired size to fill the readable side’s internal queue. It can be negative, if the queue is over-full.\n   */\n  get desiredSize(): number | null {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('desiredSize');\n    }\n\n    const readableController = this._controlledTransformStream._readable._readableStreamController;\n    return ReadableStreamDefaultControllerGetDesiredSize(readableController as ReadableStreamDefaultController<O>);\n  }\n\n  /**\n   * Enqueues the given chunk `chunk` in the readable side of the controlled transform stream.\n   */\n  enqueue(chunk: O): void;\n  enqueue(chunk: O = undefined!): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('enqueue');\n    }\n\n    TransformStreamDefaultControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors both the readable side and the writable side of the controlled transform stream, making all future\n   * interactions with it fail with the given error `e`. Any chunks queued for transformation will be discarded.\n   */\n  error(reason: any = undefined): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n\n    TransformStreamDefaultControllerError(this, reason);\n  }\n\n  /**\n   * Closes the readable side and errors the writable side of the controlled transform stream. This is useful when the\n   * transformer only needs to consume a portion of the chunks written to the writable side.\n   */\n  terminate(): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('terminate');\n    }\n\n    TransformStreamDefaultControllerTerminate(this);\n  }\n}\n\nObject.defineProperties(TransformStreamDefaultController.prototype, {\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  terminate: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(TransformStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'TransformStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Transform Stream Default Controller Abstract Operations\n\nfunction IsTransformStreamDefaultController<O = any>(x: any): x is TransformStreamDefaultController<O> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledTransformStream')) {\n    return false;\n  }\n\n  return x instanceof TransformStreamDefaultController;\n}\n\nfunction SetUpTransformStreamDefaultController<I, O>(stream: TransformStream<I, O>,\n                                                     controller: TransformStreamDefaultController<O>,\n                                                     transformAlgorithm: (chunk: I) => Promise<void>,\n                                                     flushAlgorithm: () => Promise<void>) {\n  assert(IsTransformStream(stream));\n  assert(stream._transformStreamController === undefined);\n\n  controller._controlledTransformStream = stream;\n  stream._transformStreamController = controller;\n\n  controller._transformAlgorithm = transformAlgorithm;\n  controller._flushAlgorithm = flushAlgorithm;\n}\n\nfunction SetUpTransformStreamDefaultControllerFromTransformer<I, O>(stream: TransformStream<I, O>,\n                                                                    transformer: ValidatedTransformer<I, O>) {\n  const controller: TransformStreamDefaultController<O> = Object.create(TransformStreamDefaultController.prototype);\n\n  let transformAlgorithm = (chunk: I): Promise<void> => {\n    try {\n      TransformStreamDefaultControllerEnqueue(controller, chunk as unknown as O);\n      return promiseResolvedWith(undefined);\n    } catch (transformResultE) {\n      return promiseRejectedWith(transformResultE);\n    }\n  };\n\n  let flushAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (transformer.transform !== undefined) {\n    transformAlgorithm = chunk => transformer.transform!(chunk, controller);\n  }\n  if (transformer.flush !== undefined) {\n    flushAlgorithm = () => transformer.flush!(controller);\n  }\n\n  SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);\n}\n\nfunction TransformStreamDefaultControllerClearAlgorithms(controller: TransformStreamDefaultController<any>) {\n  controller._transformAlgorithm = undefined!;\n  controller._flushAlgorithm = undefined!;\n}\n\nfunction TransformStreamDefaultControllerEnqueue<O>(controller: TransformStreamDefaultController<O>, chunk: O) {\n  const stream = controller._controlledTransformStream;\n  const readableController = stream._readable._readableStreamController as ReadableStreamDefaultController<O>;\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(readableController)) {\n    throw new TypeError('Readable side is not in a state that permits enqueue');\n  }\n\n  // We throttle transform invocations based on the backpressure of the ReadableStream, but we still\n  // accept TransformStreamDefaultControllerEnqueue() calls.\n\n  try {\n    ReadableStreamDefaultControllerEnqueue(readableController, chunk);\n  } catch (e) {\n    // This happens when readableStrategy.size() throws.\n    TransformStreamErrorWritableAndUnblockWrite(stream, e);\n\n    throw stream._readable._storedError;\n  }\n\n  const backpressure = ReadableStreamDefaultControllerHasBackpressure(readableController);\n  if (backpressure !== stream._backpressure) {\n    assert(backpressure);\n    TransformStreamSetBackpressure(stream, true);\n  }\n}\n\nfunction TransformStreamDefaultControllerError(controller: TransformStreamDefaultController<any>, e: any) {\n  TransformStreamError(controller._controlledTransformStream, e);\n}\n\nfunction TransformStreamDefaultControllerPerformTransform<I, O>(controller: TransformStreamDefaultController<O>,\n                                                                chunk: I) {\n  const transformPromise = controller._transformAlgorithm(chunk);\n  return transformPromiseWith(transformPromise, undefined, r => {\n    TransformStreamError(controller._controlledTransformStream, r);\n    throw r;\n  });\n}\n\nfunction TransformStreamDefaultControllerTerminate<O>(controller: TransformStreamDefaultController<O>) {\n  const stream = controller._controlledTransformStream;\n  const readableController = stream._readable._readableStreamController as ReadableStreamDefaultController<O>;\n\n  ReadableStreamDefaultControllerClose(readableController);\n\n  const error = new TypeError('TransformStream terminated');\n  TransformStreamErrorWritableAndUnblockWrite(stream, error);\n}\n\n// TransformStreamDefaultSink Algorithms\n\nfunction TransformStreamDefaultSinkWriteAlgorithm<I, O>(stream: TransformStream<I, O>, chunk: I): Promise<void> {\n  assert(stream._writable._state === 'writable');\n\n  const controller = stream._transformStreamController;\n\n  if (stream._backpressure) {\n    const backpressureChangePromise = stream._backpressureChangePromise;\n    assert(backpressureChangePromise !== undefined);\n    return transformPromiseWith(backpressureChangePromise, () => {\n      const writable = stream._writable;\n      const state = writable._state;\n      if (state === 'erroring') {\n        throw writable._storedError;\n      }\n      assert(state === 'writable');\n      return TransformStreamDefaultControllerPerformTransform<I, O>(controller, chunk);\n    });\n  }\n\n  return TransformStreamDefaultControllerPerformTransform<I, O>(controller, chunk);\n}\n\nfunction TransformStreamDefaultSinkAbortAlgorithm(stream: TransformStream, reason: any): Promise<void> {\n  // abort() is not called synchronously, so it is possible for abort() to be called when the stream is already\n  // errored.\n  TransformStreamError(stream, reason);\n  return promiseResolvedWith(undefined);\n}\n\nfunction TransformStreamDefaultSinkCloseAlgorithm<I, O>(stream: TransformStream<I, O>): Promise<void> {\n  // stream._readable cannot change after construction, so caching it across a call to user code is safe.\n  const readable = stream._readable;\n\n  const controller = stream._transformStreamController;\n  const flushPromise = controller._flushAlgorithm();\n  TransformStreamDefaultControllerClearAlgorithms(controller);\n\n  // Return a promise that is fulfilled with undefined on success.\n  return transformPromiseWith(flushPromise, () => {\n    if (readable._state === 'errored') {\n      throw readable._storedError;\n    }\n    ReadableStreamDefaultControllerClose(readable._readableStreamController as ReadableStreamDefaultController<O>);\n  }, r => {\n    TransformStreamError(stream, r);\n    throw readable._storedError;\n  });\n}\n\n// TransformStreamDefaultSource Algorithms\n\nfunction TransformStreamDefaultSourcePullAlgorithm(stream: TransformStream): Promise<void> {\n  // Invariant. Enforced by the promises returned by start() and pull().\n  assert(stream._backpressure);\n\n  assert(stream._backpressureChangePromise !== undefined);\n\n  TransformStreamSetBackpressure(stream, false);\n\n  // Prevent the next pull() call until there is backpressure.\n  return stream._backpressureChangePromise;\n}\n\n// Helper functions for the TransformStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `TransformStreamDefaultController.prototype.${name} can only be used on a TransformStreamDefaultController`);\n}\n\n// Helper functions for the TransformStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `TransformStream.prototype.${name} can only be used on a TransformStream`);\n}\n","import {\n  ByteLengthQueuingStrategy,\n  CountQueuingStrategy,\n  ReadableByteStreamController,\n  ReadableStream,\n  ReadableStreamBYOBReader,\n  ReadableStreamBYOBRequest,\n  ReadableStreamDefaultController,\n  ReadableStreamDefaultReader,\n  TransformStream,\n  TransformStreamDefaultController,\n  WritableStream,\n  WritableStreamDefaultController,\n  WritableStreamDefaultWriter\n} from './ponyfill';\nimport { globals } from './utils';\n\n// Export\nexport * from './ponyfill';\n\nconst exports = {\n  ReadableStream,\n  ReadableStreamDefaultController,\n  ReadableByteStreamController,\n  ReadableStreamBYOBRequest,\n  ReadableStreamDefaultReader,\n  ReadableStreamBYOBReader,\n\n  WritableStream,\n  WritableStreamDefaultController,\n  WritableStreamDefaultWriter,\n\n  ByteLengthQueuingStrategy,\n  CountQueuingStrategy,\n\n  TransformStream,\n  TransformStreamDefaultController\n};\n\n// Add classes to global scope\nif (typeof globals !== 'undefined') {\n  for (const prop in exports) {\n    if (Object.prototype.hasOwnProperty.call(exports, prop)) {\n      Object.defineProperty(globals, prop, {\n        value: exports[prop as (keyof 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\ No newline at end of file
diff --git a/node_modules/web-streams-polyfill/dist/ponyfill.es2018.js b/node_modules/web-streams-polyfill/dist/ponyfill.es2018.js
new file mode 100644
index 0000000..95561e5
--- /dev/null
+++ b/node_modules/web-streams-polyfill/dist/ponyfill.es2018.js
@@ -0,0 +1,4213 @@
+/**
+ * web-streams-polyfill v3.2.1
+ */
+(function (global, factory) {
+    typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
+    typeof define === 'function' && define.amd ? define(['exports'], factory) :
+    (global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.WebStreamsPolyfill = {}));
+}(this, (function (exports) { 'use strict';
+
+    /// <reference lib="es2015.symbol" />
+    const SymbolPolyfill = typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol' ?
+        Symbol :
+        description => `Symbol(${description})`;
+
+    /// <reference lib="dom" />
+    function noop() {
+        return undefined;
+    }
+    function getGlobals() {
+        if (typeof self !== 'undefined') {
+            return self;
+        }
+        else if (typeof window !== 'undefined') {
+            return window;
+        }
+        else if (typeof global !== 'undefined') {
+            return global;
+        }
+        return undefined;
+    }
+    const globals = getGlobals();
+
+    function typeIsObject(x) {
+        return (typeof x === 'object' && x !== null) || typeof x === 'function';
+    }
+    const rethrowAssertionErrorRejection = noop;
+
+    const originalPromise = Promise;
+    const originalPromiseThen = Promise.prototype.then;
+    const originalPromiseResolve = Promise.resolve.bind(originalPromise);
+    const originalPromiseReject = Promise.reject.bind(originalPromise);
+    function newPromise(executor) {
+        return new originalPromise(executor);
+    }
+    function promiseResolvedWith(value) {
+        return originalPromiseResolve(value);
+    }
+    function promiseRejectedWith(reason) {
+        return originalPromiseReject(reason);
+    }
+    function PerformPromiseThen(promise, onFulfilled, onRejected) {
+        // There doesn't appear to be any way to correctly emulate the behaviour from JavaScript, so this is just an
+        // approximation.
+        return originalPromiseThen.call(promise, onFulfilled, onRejected);
+    }
+    function uponPromise(promise, onFulfilled, onRejected) {
+        PerformPromiseThen(PerformPromiseThen(promise, onFulfilled, onRejected), undefined, rethrowAssertionErrorRejection);
+    }
+    function uponFulfillment(promise, onFulfilled) {
+        uponPromise(promise, onFulfilled);
+    }
+    function uponRejection(promise, onRejected) {
+        uponPromise(promise, undefined, onRejected);
+    }
+    function transformPromiseWith(promise, fulfillmentHandler, rejectionHandler) {
+        return PerformPromiseThen(promise, fulfillmentHandler, rejectionHandler);
+    }
+    function setPromiseIsHandledToTrue(promise) {
+        PerformPromiseThen(promise, undefined, rethrowAssertionErrorRejection);
+    }
+    const queueMicrotask = (() => {
+        const globalQueueMicrotask = globals && globals.queueMicrotask;
+        if (typeof globalQueueMicrotask === 'function') {
+            return globalQueueMicrotask;
+        }
+        const resolvedPromise = promiseResolvedWith(undefined);
+        return (fn) => PerformPromiseThen(resolvedPromise, fn);
+    })();
+    function reflectCall(F, V, args) {
+        if (typeof F !== 'function') {
+            throw new TypeError('Argument is not a function');
+        }
+        return Function.prototype.apply.call(F, V, args);
+    }
+    function promiseCall(F, V, args) {
+        try {
+            return promiseResolvedWith(reflectCall(F, V, args));
+        }
+        catch (value) {
+            return promiseRejectedWith(value);
+        }
+    }
+
+    // Original from Chromium
+    // https://chromium.googlesource.com/chromium/src/+/0aee4434a4dba42a42abaea9bfbc0cd196a63bc1/third_party/blink/renderer/core/streams/SimpleQueue.js
+    const QUEUE_MAX_ARRAY_SIZE = 16384;
+    /**
+     * Simple queue structure.
+     *
+     * Avoids scalability issues with using a packed array directly by using
+     * multiple arrays in a linked list and keeping the array size bounded.
+     */
+    class SimpleQueue {
+        constructor() {
+            this._cursor = 0;
+            this._size = 0;
+            // _front and _back are always defined.
+            this._front = {
+                _elements: [],
+                _next: undefined
+            };
+            this._back = this._front;
+            // The cursor is used to avoid calling Array.shift().
+            // It contains the index of the front element of the array inside the
+            // front-most node. It is always in the range [0, QUEUE_MAX_ARRAY_SIZE).
+            this._cursor = 0;
+            // When there is only one node, size === elements.length - cursor.
+            this._size = 0;
+        }
+        get length() {
+            return this._size;
+        }
+        // For exception safety, this method is structured in order:
+        // 1. Read state
+        // 2. Calculate required state mutations
+        // 3. Perform state mutations
+        push(element) {
+            const oldBack = this._back;
+            let newBack = oldBack;
+            if (oldBack._elements.length === QUEUE_MAX_ARRAY_SIZE - 1) {
+                newBack = {
+                    _elements: [],
+                    _next: undefined
+                };
+            }
+            // push() is the mutation most likely to throw an exception, so it
+            // goes first.
+            oldBack._elements.push(element);
+            if (newBack !== oldBack) {
+                this._back = newBack;
+                oldBack._next = newBack;
+            }
+            ++this._size;
+        }
+        // Like push(), shift() follows the read -> calculate -> mutate pattern for
+        // exception safety.
+        shift() { // must not be called on an empty queue
+            const oldFront = this._front;
+            let newFront = oldFront;
+            const oldCursor = this._cursor;
+            let newCursor = oldCursor + 1;
+            const elements = oldFront._elements;
+            const element = elements[oldCursor];
+            if (newCursor === QUEUE_MAX_ARRAY_SIZE) {
+                newFront = oldFront._next;
+                newCursor = 0;
+            }
+            // No mutations before this point.
+            --this._size;
+            this._cursor = newCursor;
+            if (oldFront !== newFront) {
+                this._front = newFront;
+            }
+            // Permit shifted element to be garbage collected.
+            elements[oldCursor] = undefined;
+            return element;
+        }
+        // The tricky thing about forEach() is that it can be called
+        // re-entrantly. The queue may be mutated inside the callback. It is easy to
+        // see that push() within the callback has no negative effects since the end
+        // of the queue is checked for on every iteration. If shift() is called
+        // repeatedly within the callback then the next iteration may return an
+        // element that has been removed. In this case the callback will be called
+        // with undefined values until we either "catch up" with elements that still
+        // exist or reach the back of the queue.
+        forEach(callback) {
+            let i = this._cursor;
+            let node = this._front;
+            let elements = node._elements;
+            while (i !== elements.length || node._next !== undefined) {
+                if (i === elements.length) {
+                    node = node._next;
+                    elements = node._elements;
+                    i = 0;
+                    if (elements.length === 0) {
+                        break;
+                    }
+                }
+                callback(elements[i]);
+                ++i;
+            }
+        }
+        // Return the element that would be returned if shift() was called now,
+        // without modifying the queue.
+        peek() { // must not be called on an empty queue
+            const front = this._front;
+            const cursor = this._cursor;
+            return front._elements[cursor];
+        }
+    }
+
+    function ReadableStreamReaderGenericInitialize(reader, stream) {
+        reader._ownerReadableStream = stream;
+        stream._reader = reader;
+        if (stream._state === 'readable') {
+            defaultReaderClosedPromiseInitialize(reader);
+        }
+        else if (stream._state === 'closed') {
+            defaultReaderClosedPromiseInitializeAsResolved(reader);
+        }
+        else {
+            defaultReaderClosedPromiseInitializeAsRejected(reader, stream._storedError);
+        }
+    }
+    // A client of ReadableStreamDefaultReader and ReadableStreamBYOBReader may use these functions directly to bypass state
+    // check.
+    function ReadableStreamReaderGenericCancel(reader, reason) {
+        const stream = reader._ownerReadableStream;
+        return ReadableStreamCancel(stream, reason);
+    }
+    function ReadableStreamReaderGenericRelease(reader) {
+        if (reader._ownerReadableStream._state === 'readable') {
+            defaultReaderClosedPromiseReject(reader, new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));
+        }
+        else {
+            defaultReaderClosedPromiseResetToRejected(reader, new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));
+        }
+        reader._ownerReadableStream._reader = undefined;
+        reader._ownerReadableStream = undefined;
+    }
+    // Helper functions for the readers.
+    function readerLockException(name) {
+        return new TypeError('Cannot ' + name + ' a stream using a released reader');
+    }
+    // Helper functions for the ReadableStreamDefaultReader.
+    function defaultReaderClosedPromiseInitialize(reader) {
+        reader._closedPromise = newPromise((resolve, reject) => {
+            reader._closedPromise_resolve = resolve;
+            reader._closedPromise_reject = reject;
+        });
+    }
+    function defaultReaderClosedPromiseInitializeAsRejected(reader, reason) {
+        defaultReaderClosedPromiseInitialize(reader);
+        defaultReaderClosedPromiseReject(reader, reason);
+    }
+    function defaultReaderClosedPromiseInitializeAsResolved(reader) {
+        defaultReaderClosedPromiseInitialize(reader);
+        defaultReaderClosedPromiseResolve(reader);
+    }
+    function defaultReaderClosedPromiseReject(reader, reason) {
+        if (reader._closedPromise_reject === undefined) {
+            return;
+        }
+        setPromiseIsHandledToTrue(reader._closedPromise);
+        reader._closedPromise_reject(reason);
+        reader._closedPromise_resolve = undefined;
+        reader._closedPromise_reject = undefined;
+    }
+    function defaultReaderClosedPromiseResetToRejected(reader, reason) {
+        defaultReaderClosedPromiseInitializeAsRejected(reader, reason);
+    }
+    function defaultReaderClosedPromiseResolve(reader) {
+        if (reader._closedPromise_resolve === undefined) {
+            return;
+        }
+        reader._closedPromise_resolve(undefined);
+        reader._closedPromise_resolve = undefined;
+        reader._closedPromise_reject = undefined;
+    }
+
+    const AbortSteps = SymbolPolyfill('[[AbortSteps]]');
+    const ErrorSteps = SymbolPolyfill('[[ErrorSteps]]');
+    const CancelSteps = SymbolPolyfill('[[CancelSteps]]');
+    const PullSteps = SymbolPolyfill('[[PullSteps]]');
+
+    /// <reference lib="es2015.core" />
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite#Polyfill
+    const NumberIsFinite = Number.isFinite || function (x) {
+        return typeof x === 'number' && isFinite(x);
+    };
+
+    /// <reference lib="es2015.core" />
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc#Polyfill
+    const MathTrunc = Math.trunc || function (v) {
+        return v < 0 ? Math.ceil(v) : Math.floor(v);
+    };
+
+    // https://heycam.github.io/webidl/#idl-dictionaries
+    function isDictionary(x) {
+        return typeof x === 'object' || typeof x === 'function';
+    }
+    function assertDictionary(obj, context) {
+        if (obj !== undefined && !isDictionary(obj)) {
+            throw new TypeError(`${context} is not an object.`);
+        }
+    }
+    // https://heycam.github.io/webidl/#idl-callback-functions
+    function assertFunction(x, context) {
+        if (typeof x !== 'function') {
+            throw new TypeError(`${context} is not a function.`);
+        }
+    }
+    // https://heycam.github.io/webidl/#idl-object
+    function isObject(x) {
+        return (typeof x === 'object' && x !== null) || typeof x === 'function';
+    }
+    function assertObject(x, context) {
+        if (!isObject(x)) {
+            throw new TypeError(`${context} is not an object.`);
+        }
+    }
+    function assertRequiredArgument(x, position, context) {
+        if (x === undefined) {
+            throw new TypeError(`Parameter ${position} is required in '${context}'.`);
+        }
+    }
+    function assertRequiredField(x, field, context) {
+        if (x === undefined) {
+            throw new TypeError(`${field} is required in '${context}'.`);
+        }
+    }
+    // https://heycam.github.io/webidl/#idl-unrestricted-double
+    function convertUnrestrictedDouble(value) {
+        return Number(value);
+    }
+    function censorNegativeZero(x) {
+        return x === 0 ? 0 : x;
+    }
+    function integerPart(x) {
+        return censorNegativeZero(MathTrunc(x));
+    }
+    // https://heycam.github.io/webidl/#idl-unsigned-long-long
+    function convertUnsignedLongLongWithEnforceRange(value, context) {
+        const lowerBound = 0;
+        const upperBound = Number.MAX_SAFE_INTEGER;
+        let x = Number(value);
+        x = censorNegativeZero(x);
+        if (!NumberIsFinite(x)) {
+            throw new TypeError(`${context} is not a finite number`);
+        }
+        x = integerPart(x);
+        if (x < lowerBound || x > upperBound) {
+            throw new TypeError(`${context} is outside the accepted range of ${lowerBound} to ${upperBound}, inclusive`);
+        }
+        if (!NumberIsFinite(x) || x === 0) {
+            return 0;
+        }
+        // TODO Use BigInt if supported?
+        // let xBigInt = BigInt(integerPart(x));
+        // xBigInt = BigInt.asUintN(64, xBigInt);
+        // return Number(xBigInt);
+        return x;
+    }
+
+    function assertReadableStream(x, context) {
+        if (!IsReadableStream(x)) {
+            throw new TypeError(`${context} is not a ReadableStream.`);
+        }
+    }
+
+    // Abstract operations for the ReadableStream.
+    function AcquireReadableStreamDefaultReader(stream) {
+        return new ReadableStreamDefaultReader(stream);
+    }
+    // ReadableStream API exposed for controllers.
+    function ReadableStreamAddReadRequest(stream, readRequest) {
+        stream._reader._readRequests.push(readRequest);
+    }
+    function ReadableStreamFulfillReadRequest(stream, chunk, done) {
+        const reader = stream._reader;
+        const readRequest = reader._readRequests.shift();
+        if (done) {
+            readRequest._closeSteps();
+        }
+        else {
+            readRequest._chunkSteps(chunk);
+        }
+    }
+    function ReadableStreamGetNumReadRequests(stream) {
+        return stream._reader._readRequests.length;
+    }
+    function ReadableStreamHasDefaultReader(stream) {
+        const reader = stream._reader;
+        if (reader === undefined) {
+            return false;
+        }
+        if (!IsReadableStreamDefaultReader(reader)) {
+            return false;
+        }
+        return true;
+    }
+    /**
+     * A default reader vended by a {@link ReadableStream}.
+     *
+     * @public
+     */
+    class ReadableStreamDefaultReader {
+        constructor(stream) {
+            assertRequiredArgument(stream, 1, 'ReadableStreamDefaultReader');
+            assertReadableStream(stream, 'First parameter');
+            if (IsReadableStreamLocked(stream)) {
+                throw new TypeError('This stream has already been locked for exclusive reading by another reader');
+            }
+            ReadableStreamReaderGenericInitialize(this, stream);
+            this._readRequests = new SimpleQueue();
+        }
+        /**
+         * Returns a promise that will be fulfilled when the stream becomes closed,
+         * or rejected if the stream ever errors or the reader's lock is released before the stream finishes closing.
+         */
+        get closed() {
+            if (!IsReadableStreamDefaultReader(this)) {
+                return promiseRejectedWith(defaultReaderBrandCheckException('closed'));
+            }
+            return this._closedPromise;
+        }
+        /**
+         * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.
+         */
+        cancel(reason = undefined) {
+            if (!IsReadableStreamDefaultReader(this)) {
+                return promiseRejectedWith(defaultReaderBrandCheckException('cancel'));
+            }
+            if (this._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('cancel'));
+            }
+            return ReadableStreamReaderGenericCancel(this, reason);
+        }
+        /**
+         * Returns a promise that allows access to the next chunk from the stream's internal queue, if available.
+         *
+         * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.
+         */
+        read() {
+            if (!IsReadableStreamDefaultReader(this)) {
+                return promiseRejectedWith(defaultReaderBrandCheckException('read'));
+            }
+            if (this._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('read from'));
+            }
+            let resolvePromise;
+            let rejectPromise;
+            const promise = newPromise((resolve, reject) => {
+                resolvePromise = resolve;
+                rejectPromise = reject;
+            });
+            const readRequest = {
+                _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),
+                _closeSteps: () => resolvePromise({ value: undefined, done: true }),
+                _errorSteps: e => rejectPromise(e)
+            };
+            ReadableStreamDefaultReaderRead(this, readRequest);
+            return promise;
+        }
+        /**
+         * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.
+         * If the associated stream is errored when the lock is released, the reader will appear errored in the same way
+         * from now on; otherwise, the reader will appear closed.
+         *
+         * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by
+         * the reader's {@link ReadableStreamDefaultReader.read | read()} method has not yet been settled. Attempting to
+         * do so will throw a `TypeError` and leave the reader locked to the stream.
+         */
+        releaseLock() {
+            if (!IsReadableStreamDefaultReader(this)) {
+                throw defaultReaderBrandCheckException('releaseLock');
+            }
+            if (this._ownerReadableStream === undefined) {
+                return;
+            }
+            if (this._readRequests.length > 0) {
+                throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');
+            }
+            ReadableStreamReaderGenericRelease(this);
+        }
+    }
+    Object.defineProperties(ReadableStreamDefaultReader.prototype, {
+        cancel: { enumerable: true },
+        read: { enumerable: true },
+        releaseLock: { enumerable: true },
+        closed: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableStreamDefaultReader.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableStreamDefaultReader',
+            configurable: true
+        });
+    }
+    // Abstract operations for the readers.
+    function IsReadableStreamDefaultReader(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_readRequests')) {
+            return false;
+        }
+        return x instanceof ReadableStreamDefaultReader;
+    }
+    function ReadableStreamDefaultReaderRead(reader, readRequest) {
+        const stream = reader._ownerReadableStream;
+        stream._disturbed = true;
+        if (stream._state === 'closed') {
+            readRequest._closeSteps();
+        }
+        else if (stream._state === 'errored') {
+            readRequest._errorSteps(stream._storedError);
+        }
+        else {
+            stream._readableStreamController[PullSteps](readRequest);
+        }
+    }
+    // Helper functions for the ReadableStreamDefaultReader.
+    function defaultReaderBrandCheckException(name) {
+        return new TypeError(`ReadableStreamDefaultReader.prototype.${name} can only be used on a ReadableStreamDefaultReader`);
+    }
+
+    /// <reference lib="es2018.asynciterable" />
+    /* eslint-disable @typescript-eslint/no-empty-function */
+    const AsyncIteratorPrototype = Object.getPrototypeOf(Object.getPrototypeOf(async function* () { }).prototype);
+
+    /// <reference lib="es2018.asynciterable" />
+    class ReadableStreamAsyncIteratorImpl {
+        constructor(reader, preventCancel) {
+            this._ongoingPromise = undefined;
+            this._isFinished = false;
+            this._reader = reader;
+            this._preventCancel = preventCancel;
+        }
+        next() {
+            const nextSteps = () => this._nextSteps();
+            this._ongoingPromise = this._ongoingPromise ?
+                transformPromiseWith(this._ongoingPromise, nextSteps, nextSteps) :
+                nextSteps();
+            return this._ongoingPromise;
+        }
+        return(value) {
+            const returnSteps = () => this._returnSteps(value);
+            return this._ongoingPromise ?
+                transformPromiseWith(this._ongoingPromise, returnSteps, returnSteps) :
+                returnSteps();
+        }
+        _nextSteps() {
+            if (this._isFinished) {
+                return Promise.resolve({ value: undefined, done: true });
+            }
+            const reader = this._reader;
+            if (reader._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('iterate'));
+            }
+            let resolvePromise;
+            let rejectPromise;
+            const promise = newPromise((resolve, reject) => {
+                resolvePromise = resolve;
+                rejectPromise = reject;
+            });
+            const readRequest = {
+                _chunkSteps: chunk => {
+                    this._ongoingPromise = undefined;
+                    // This needs to be delayed by one microtask, otherwise we stop pulling too early which breaks a test.
+                    // FIXME Is this a bug in the specification, or in the test?
+                    queueMicrotask(() => resolvePromise({ value: chunk, done: false }));
+                },
+                _closeSteps: () => {
+                    this._ongoingPromise = undefined;
+                    this._isFinished = true;
+                    ReadableStreamReaderGenericRelease(reader);
+                    resolvePromise({ value: undefined, done: true });
+                },
+                _errorSteps: reason => {
+                    this._ongoingPromise = undefined;
+                    this._isFinished = true;
+                    ReadableStreamReaderGenericRelease(reader);
+                    rejectPromise(reason);
+                }
+            };
+            ReadableStreamDefaultReaderRead(reader, readRequest);
+            return promise;
+        }
+        _returnSteps(value) {
+            if (this._isFinished) {
+                return Promise.resolve({ value, done: true });
+            }
+            this._isFinished = true;
+            const reader = this._reader;
+            if (reader._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('finish iterating'));
+            }
+            if (!this._preventCancel) {
+                const result = ReadableStreamReaderGenericCancel(reader, value);
+                ReadableStreamReaderGenericRelease(reader);
+                return transformPromiseWith(result, () => ({ value, done: true }));
+            }
+            ReadableStreamReaderGenericRelease(reader);
+            return promiseResolvedWith({ value, done: true });
+        }
+    }
+    const ReadableStreamAsyncIteratorPrototype = {
+        next() {
+            if (!IsReadableStreamAsyncIterator(this)) {
+                return promiseRejectedWith(streamAsyncIteratorBrandCheckException('next'));
+            }
+            return this._asyncIteratorImpl.next();
+        },
+        return(value) {
+            if (!IsReadableStreamAsyncIterator(this)) {
+                return promiseRejectedWith(streamAsyncIteratorBrandCheckException('return'));
+            }
+            return this._asyncIteratorImpl.return(value);
+        }
+    };
+    if (AsyncIteratorPrototype !== undefined) {
+        Object.setPrototypeOf(ReadableStreamAsyncIteratorPrototype, AsyncIteratorPrototype);
+    }
+    // Abstract operations for the ReadableStream.
+    function AcquireReadableStreamAsyncIterator(stream, preventCancel) {
+        const reader = AcquireReadableStreamDefaultReader(stream);
+        const impl = new ReadableStreamAsyncIteratorImpl(reader, preventCancel);
+        const iterator = Object.create(ReadableStreamAsyncIteratorPrototype);
+        iterator._asyncIteratorImpl = impl;
+        return iterator;
+    }
+    function IsReadableStreamAsyncIterator(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_asyncIteratorImpl')) {
+            return false;
+        }
+        try {
+            // noinspection SuspiciousTypeOfGuard
+            return x._asyncIteratorImpl instanceof
+                ReadableStreamAsyncIteratorImpl;
+        }
+        catch (_a) {
+            return false;
+        }
+    }
+    // Helper functions for the ReadableStream.
+    function streamAsyncIteratorBrandCheckException(name) {
+        return new TypeError(`ReadableStreamAsyncIterator.${name} can only be used on a ReadableSteamAsyncIterator`);
+    }
+
+    /// <reference lib="es2015.core" />
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Polyfill
+    const NumberIsNaN = Number.isNaN || function (x) {
+        // eslint-disable-next-line no-self-compare
+        return x !== x;
+    };
+
+    function CreateArrayFromList(elements) {
+        // We use arrays to represent lists, so this is basically a no-op.
+        // Do a slice though just in case we happen to depend on the unique-ness.
+        return elements.slice();
+    }
+    function CopyDataBlockBytes(dest, destOffset, src, srcOffset, n) {
+        new Uint8Array(dest).set(new Uint8Array(src, srcOffset, n), destOffset);
+    }
+    // Not implemented correctly
+    function TransferArrayBuffer(O) {
+        return O;
+    }
+    // Not implemented correctly
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    function IsDetachedBuffer(O) {
+        return false;
+    }
+    function ArrayBufferSlice(buffer, begin, end) {
+        // ArrayBuffer.prototype.slice is not available on IE10
+        // https://www.caniuse.com/mdn-javascript_builtins_arraybuffer_slice
+        if (buffer.slice) {
+            return buffer.slice(begin, end);
+        }
+        const length = end - begin;
+        const slice = new ArrayBuffer(length);
+        CopyDataBlockBytes(slice, 0, buffer, begin, length);
+        return slice;
+    }
+
+    function IsNonNegativeNumber(v) {
+        if (typeof v !== 'number') {
+            return false;
+        }
+        if (NumberIsNaN(v)) {
+            return false;
+        }
+        if (v < 0) {
+            return false;
+        }
+        return true;
+    }
+    function CloneAsUint8Array(O) {
+        const buffer = ArrayBufferSlice(O.buffer, O.byteOffset, O.byteOffset + O.byteLength);
+        return new Uint8Array(buffer);
+    }
+
+    function DequeueValue(container) {
+        const pair = container._queue.shift();
+        container._queueTotalSize -= pair.size;
+        if (container._queueTotalSize < 0) {
+            container._queueTotalSize = 0;
+        }
+        return pair.value;
+    }
+    function EnqueueValueWithSize(container, value, size) {
+        if (!IsNonNegativeNumber(size) || size === Infinity) {
+            throw new RangeError('Size must be a finite, non-NaN, non-negative number.');
+        }
+        container._queue.push({ value, size });
+        container._queueTotalSize += size;
+    }
+    function PeekQueueValue(container) {
+        const pair = container._queue.peek();
+        return pair.value;
+    }
+    function ResetQueue(container) {
+        container._queue = new SimpleQueue();
+        container._queueTotalSize = 0;
+    }
+
+    /**
+     * A pull-into request in a {@link ReadableByteStreamController}.
+     *
+     * @public
+     */
+    class ReadableStreamBYOBRequest {
+        constructor() {
+            throw new TypeError('Illegal constructor');
+        }
+        /**
+         * Returns the view for writing in to, or `null` if the BYOB request has already been responded to.
+         */
+        get view() {
+            if (!IsReadableStreamBYOBRequest(this)) {
+                throw byobRequestBrandCheckException('view');
+            }
+            return this._view;
+        }
+        respond(bytesWritten) {
+            if (!IsReadableStreamBYOBRequest(this)) {
+                throw byobRequestBrandCheckException('respond');
+            }
+            assertRequiredArgument(bytesWritten, 1, 'respond');
+            bytesWritten = convertUnsignedLongLongWithEnforceRange(bytesWritten, 'First parameter');
+            if (this._associatedReadableByteStreamController === undefined) {
+                throw new TypeError('This BYOB request has been invalidated');
+            }
+            if (IsDetachedBuffer(this._view.buffer)) ;
+            ReadableByteStreamControllerRespond(this._associatedReadableByteStreamController, bytesWritten);
+        }
+        respondWithNewView(view) {
+            if (!IsReadableStreamBYOBRequest(this)) {
+                throw byobRequestBrandCheckException('respondWithNewView');
+            }
+            assertRequiredArgument(view, 1, 'respondWithNewView');
+            if (!ArrayBuffer.isView(view)) {
+                throw new TypeError('You can only respond with array buffer views');
+            }
+            if (this._associatedReadableByteStreamController === undefined) {
+                throw new TypeError('This BYOB request has been invalidated');
+            }
+            if (IsDetachedBuffer(view.buffer)) ;
+            ReadableByteStreamControllerRespondWithNewView(this._associatedReadableByteStreamController, view);
+        }
+    }
+    Object.defineProperties(ReadableStreamBYOBRequest.prototype, {
+        respond: { enumerable: true },
+        respondWithNewView: { enumerable: true },
+        view: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableStreamBYOBRequest.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableStreamBYOBRequest',
+            configurable: true
+        });
+    }
+    /**
+     * Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue.
+     *
+     * @public
+     */
+    class ReadableByteStreamController {
+        constructor() {
+            throw new TypeError('Illegal constructor');
+        }
+        /**
+         * Returns the current BYOB pull request, or `null` if there isn't one.
+         */
+        get byobRequest() {
+            if (!IsReadableByteStreamController(this)) {
+                throw byteStreamControllerBrandCheckException('byobRequest');
+            }
+            return ReadableByteStreamControllerGetBYOBRequest(this);
+        }
+        /**
+         * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is
+         * over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure.
+         */
+        get desiredSize() {
+            if (!IsReadableByteStreamController(this)) {
+                throw byteStreamControllerBrandCheckException('desiredSize');
+            }
+            return ReadableByteStreamControllerGetDesiredSize(this);
+        }
+        /**
+         * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from
+         * the stream, but once those are read, the stream will become closed.
+         */
+        close() {
+            if (!IsReadableByteStreamController(this)) {
+                throw byteStreamControllerBrandCheckException('close');
+            }
+            if (this._closeRequested) {
+                throw new TypeError('The stream has already been closed; do not close it again!');
+            }
+            const state = this._controlledReadableByteStream._state;
+            if (state !== 'readable') {
+                throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be closed`);
+            }
+            ReadableByteStreamControllerClose(this);
+        }
+        enqueue(chunk) {
+            if (!IsReadableByteStreamController(this)) {
+                throw byteStreamControllerBrandCheckException('enqueue');
+            }
+            assertRequiredArgument(chunk, 1, 'enqueue');
+            if (!ArrayBuffer.isView(chunk)) {
+                throw new TypeError('chunk must be an array buffer view');
+            }
+            if (chunk.byteLength === 0) {
+                throw new TypeError('chunk must have non-zero byteLength');
+            }
+            if (chunk.buffer.byteLength === 0) {
+                throw new TypeError(`chunk's buffer must have non-zero byteLength`);
+            }
+            if (this._closeRequested) {
+                throw new TypeError('stream is closed or draining');
+            }
+            const state = this._controlledReadableByteStream._state;
+            if (state !== 'readable') {
+                throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be enqueued to`);
+            }
+            ReadableByteStreamControllerEnqueue(this, chunk);
+        }
+        /**
+         * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.
+         */
+        error(e = undefined) {
+            if (!IsReadableByteStreamController(this)) {
+                throw byteStreamControllerBrandCheckException('error');
+            }
+            ReadableByteStreamControllerError(this, e);
+        }
+        /** @internal */
+        [CancelSteps](reason) {
+            ReadableByteStreamControllerClearPendingPullIntos(this);
+            ResetQueue(this);
+            const result = this._cancelAlgorithm(reason);
+            ReadableByteStreamControllerClearAlgorithms(this);
+            return result;
+        }
+        /** @internal */
+        [PullSteps](readRequest) {
+            const stream = this._controlledReadableByteStream;
+            if (this._queueTotalSize > 0) {
+                const entry = this._queue.shift();
+                this._queueTotalSize -= entry.byteLength;
+                ReadableByteStreamControllerHandleQueueDrain(this);
+                const view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);
+                readRequest._chunkSteps(view);
+                return;
+            }
+            const autoAllocateChunkSize = this._autoAllocateChunkSize;
+            if (autoAllocateChunkSize !== undefined) {
+                let buffer;
+                try {
+                    buffer = new ArrayBuffer(autoAllocateChunkSize);
+                }
+                catch (bufferE) {
+                    readRequest._errorSteps(bufferE);
+                    return;
+                }
+                const pullIntoDescriptor = {
+                    buffer,
+                    bufferByteLength: autoAllocateChunkSize,
+                    byteOffset: 0,
+                    byteLength: autoAllocateChunkSize,
+                    bytesFilled: 0,
+                    elementSize: 1,
+                    viewConstructor: Uint8Array,
+                    readerType: 'default'
+                };
+                this._pendingPullIntos.push(pullIntoDescriptor);
+            }
+            ReadableStreamAddReadRequest(stream, readRequest);
+            ReadableByteStreamControllerCallPullIfNeeded(this);
+        }
+    }
+    Object.defineProperties(ReadableByteStreamController.prototype, {
+        close: { enumerable: true },
+        enqueue: { enumerable: true },
+        error: { enumerable: true },
+        byobRequest: { enumerable: true },
+        desiredSize: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableByteStreamController.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableByteStreamController',
+            configurable: true
+        });
+    }
+    // Abstract operations for the ReadableByteStreamController.
+    function IsReadableByteStreamController(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableByteStream')) {
+            return false;
+        }
+        return x instanceof ReadableByteStreamController;
+    }
+    function IsReadableStreamBYOBRequest(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_associatedReadableByteStreamController')) {
+            return false;
+        }
+        return x instanceof ReadableStreamBYOBRequest;
+    }
+    function ReadableByteStreamControllerCallPullIfNeeded(controller) {
+        const shouldPull = ReadableByteStreamControllerShouldCallPull(controller);
+        if (!shouldPull) {
+            return;
+        }
+        if (controller._pulling) {
+            controller._pullAgain = true;
+            return;
+        }
+        controller._pulling = true;
+        // TODO: Test controller argument
+        const pullPromise = controller._pullAlgorithm();
+        uponPromise(pullPromise, () => {
+            controller._pulling = false;
+            if (controller._pullAgain) {
+                controller._pullAgain = false;
+                ReadableByteStreamControllerCallPullIfNeeded(controller);
+            }
+        }, e => {
+            ReadableByteStreamControllerError(controller, e);
+        });
+    }
+    function ReadableByteStreamControllerClearPendingPullIntos(controller) {
+        ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+        controller._pendingPullIntos = new SimpleQueue();
+    }
+    function ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor) {
+        let done = false;
+        if (stream._state === 'closed') {
+            done = true;
+        }
+        const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor);
+        if (pullIntoDescriptor.readerType === 'default') {
+            ReadableStreamFulfillReadRequest(stream, filledView, done);
+        }
+        else {
+            ReadableStreamFulfillReadIntoRequest(stream, filledView, done);
+        }
+    }
+    function ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor) {
+        const bytesFilled = pullIntoDescriptor.bytesFilled;
+        const elementSize = pullIntoDescriptor.elementSize;
+        return new pullIntoDescriptor.viewConstructor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize);
+    }
+    function ReadableByteStreamControllerEnqueueChunkToQueue(controller, buffer, byteOffset, byteLength) {
+        controller._queue.push({ buffer, byteOffset, byteLength });
+        controller._queueTotalSize += byteLength;
+    }
+    function ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor) {
+        const elementSize = pullIntoDescriptor.elementSize;
+        const currentAlignedBytes = pullIntoDescriptor.bytesFilled - pullIntoDescriptor.bytesFilled % elementSize;
+        const maxBytesToCopy = Math.min(controller._queueTotalSize, pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled);
+        const maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;
+        const maxAlignedBytes = maxBytesFilled - maxBytesFilled % elementSize;
+        let totalBytesToCopyRemaining = maxBytesToCopy;
+        let ready = false;
+        if (maxAlignedBytes > currentAlignedBytes) {
+            totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled;
+            ready = true;
+        }
+        const queue = controller._queue;
+        while (totalBytesToCopyRemaining > 0) {
+            const headOfQueue = queue.peek();
+            const bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength);
+            const destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;
+            CopyDataBlockBytes(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy);
+            if (headOfQueue.byteLength === bytesToCopy) {
+                queue.shift();
+            }
+            else {
+                headOfQueue.byteOffset += bytesToCopy;
+                headOfQueue.byteLength -= bytesToCopy;
+            }
+            controller._queueTotalSize -= bytesToCopy;
+            ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor);
+            totalBytesToCopyRemaining -= bytesToCopy;
+        }
+        return ready;
+    }
+    function ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, size, pullIntoDescriptor) {
+        pullIntoDescriptor.bytesFilled += size;
+    }
+    function ReadableByteStreamControllerHandleQueueDrain(controller) {
+        if (controller._queueTotalSize === 0 && controller._closeRequested) {
+            ReadableByteStreamControllerClearAlgorithms(controller);
+            ReadableStreamClose(controller._controlledReadableByteStream);
+        }
+        else {
+            ReadableByteStreamControllerCallPullIfNeeded(controller);
+        }
+    }
+    function ReadableByteStreamControllerInvalidateBYOBRequest(controller) {
+        if (controller._byobRequest === null) {
+            return;
+        }
+        controller._byobRequest._associatedReadableByteStreamController = undefined;
+        controller._byobRequest._view = null;
+        controller._byobRequest = null;
+    }
+    function ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller) {
+        while (controller._pendingPullIntos.length > 0) {
+            if (controller._queueTotalSize === 0) {
+                return;
+            }
+            const pullIntoDescriptor = controller._pendingPullIntos.peek();
+            if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {
+                ReadableByteStreamControllerShiftPendingPullInto(controller);
+                ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);
+            }
+        }
+    }
+    function ReadableByteStreamControllerPullInto(controller, view, readIntoRequest) {
+        const stream = controller._controlledReadableByteStream;
+        let elementSize = 1;
+        if (view.constructor !== DataView) {
+            elementSize = view.constructor.BYTES_PER_ELEMENT;
+        }
+        const ctor = view.constructor;
+        // try {
+        const buffer = TransferArrayBuffer(view.buffer);
+        // } catch (e) {
+        //   readIntoRequest._errorSteps(e);
+        //   return;
+        // }
+        const pullIntoDescriptor = {
+            buffer,
+            bufferByteLength: buffer.byteLength,
+            byteOffset: view.byteOffset,
+            byteLength: view.byteLength,
+            bytesFilled: 0,
+            elementSize,
+            viewConstructor: ctor,
+            readerType: 'byob'
+        };
+        if (controller._pendingPullIntos.length > 0) {
+            controller._pendingPullIntos.push(pullIntoDescriptor);
+            // No ReadableByteStreamControllerCallPullIfNeeded() call since:
+            // - No change happens on desiredSize
+            // - The source has already been notified of that there's at least 1 pending read(view)
+            ReadableStreamAddReadIntoRequest(stream, readIntoRequest);
+            return;
+        }
+        if (stream._state === 'closed') {
+            const emptyView = new ctor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0);
+            readIntoRequest._closeSteps(emptyView);
+            return;
+        }
+        if (controller._queueTotalSize > 0) {
+            if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {
+                const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor);
+                ReadableByteStreamControllerHandleQueueDrain(controller);
+                readIntoRequest._chunkSteps(filledView);
+                return;
+            }
+            if (controller._closeRequested) {
+                const e = new TypeError('Insufficient bytes to fill elements in the given buffer');
+                ReadableByteStreamControllerError(controller, e);
+                readIntoRequest._errorSteps(e);
+                return;
+            }
+        }
+        controller._pendingPullIntos.push(pullIntoDescriptor);
+        ReadableStreamAddReadIntoRequest(stream, readIntoRequest);
+        ReadableByteStreamControllerCallPullIfNeeded(controller);
+    }
+    function ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor) {
+        const stream = controller._controlledReadableByteStream;
+        if (ReadableStreamHasBYOBReader(stream)) {
+            while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {
+                const pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);
+                ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);
+            }
+        }
+    }
+    function ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, pullIntoDescriptor) {
+        ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor);
+        if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {
+            return;
+        }
+        ReadableByteStreamControllerShiftPendingPullInto(controller);
+        const remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize;
+        if (remainderSize > 0) {
+            const end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;
+            const remainder = ArrayBufferSlice(pullIntoDescriptor.buffer, end - remainderSize, end);
+            ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength);
+        }
+        pullIntoDescriptor.bytesFilled -= remainderSize;
+        ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);
+        ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);
+    }
+    function ReadableByteStreamControllerRespondInternal(controller, bytesWritten) {
+        const firstDescriptor = controller._pendingPullIntos.peek();
+        ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+        const state = controller._controlledReadableByteStream._state;
+        if (state === 'closed') {
+            ReadableByteStreamControllerRespondInClosedState(controller);
+        }
+        else {
+            ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);
+        }
+        ReadableByteStreamControllerCallPullIfNeeded(controller);
+    }
+    function ReadableByteStreamControllerShiftPendingPullInto(controller) {
+        const descriptor = controller._pendingPullIntos.shift();
+        return descriptor;
+    }
+    function ReadableByteStreamControllerShouldCallPull(controller) {
+        const stream = controller._controlledReadableByteStream;
+        if (stream._state !== 'readable') {
+            return false;
+        }
+        if (controller._closeRequested) {
+            return false;
+        }
+        if (!controller._started) {
+            return false;
+        }
+        if (ReadableStreamHasDefaultReader(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+            return true;
+        }
+        if (ReadableStreamHasBYOBReader(stream) && ReadableStreamGetNumReadIntoRequests(stream) > 0) {
+            return true;
+        }
+        const desiredSize = ReadableByteStreamControllerGetDesiredSize(controller);
+        if (desiredSize > 0) {
+            return true;
+        }
+        return false;
+    }
+    function ReadableByteStreamControllerClearAlgorithms(controller) {
+        controller._pullAlgorithm = undefined;
+        controller._cancelAlgorithm = undefined;
+    }
+    // A client of ReadableByteStreamController may use these functions directly to bypass state check.
+    function ReadableByteStreamControllerClose(controller) {
+        const stream = controller._controlledReadableByteStream;
+        if (controller._closeRequested || stream._state !== 'readable') {
+            return;
+        }
+        if (controller._queueTotalSize > 0) {
+            controller._closeRequested = true;
+            return;
+        }
+        if (controller._pendingPullIntos.length > 0) {
+            const firstPendingPullInto = controller._pendingPullIntos.peek();
+            if (firstPendingPullInto.bytesFilled > 0) {
+                const e = new TypeError('Insufficient bytes to fill elements in the given buffer');
+                ReadableByteStreamControllerError(controller, e);
+                throw e;
+            }
+        }
+        ReadableByteStreamControllerClearAlgorithms(controller);
+        ReadableStreamClose(stream);
+    }
+    function ReadableByteStreamControllerEnqueue(controller, chunk) {
+        const stream = controller._controlledReadableByteStream;
+        if (controller._closeRequested || stream._state !== 'readable') {
+            return;
+        }
+        const buffer = chunk.buffer;
+        const byteOffset = chunk.byteOffset;
+        const byteLength = chunk.byteLength;
+        const transferredBuffer = TransferArrayBuffer(buffer);
+        if (controller._pendingPullIntos.length > 0) {
+            const firstPendingPullInto = controller._pendingPullIntos.peek();
+            if (IsDetachedBuffer(firstPendingPullInto.buffer)) ;
+            firstPendingPullInto.buffer = TransferArrayBuffer(firstPendingPullInto.buffer);
+        }
+        ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+        if (ReadableStreamHasDefaultReader(stream)) {
+            if (ReadableStreamGetNumReadRequests(stream) === 0) {
+                ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+            }
+            else {
+                if (controller._pendingPullIntos.length > 0) {
+                    ReadableByteStreamControllerShiftPendingPullInto(controller);
+                }
+                const transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength);
+                ReadableStreamFulfillReadRequest(stream, transferredView, false);
+            }
+        }
+        else if (ReadableStreamHasBYOBReader(stream)) {
+            // TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully.
+            ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+            ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);
+        }
+        else {
+            ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+        }
+        ReadableByteStreamControllerCallPullIfNeeded(controller);
+    }
+    function ReadableByteStreamControllerError(controller, e) {
+        const stream = controller._controlledReadableByteStream;
+        if (stream._state !== 'readable') {
+            return;
+        }
+        ReadableByteStreamControllerClearPendingPullIntos(controller);
+        ResetQueue(controller);
+        ReadableByteStreamControllerClearAlgorithms(controller);
+        ReadableStreamError(stream, e);
+    }
+    function ReadableByteStreamControllerGetBYOBRequest(controller) {
+        if (controller._byobRequest === null && controller._pendingPullIntos.length > 0) {
+            const firstDescriptor = controller._pendingPullIntos.peek();
+            const view = new Uint8Array(firstDescriptor.buffer, firstDescriptor.byteOffset + firstDescriptor.bytesFilled, firstDescriptor.byteLength - firstDescriptor.bytesFilled);
+            const byobRequest = Object.create(ReadableStreamBYOBRequest.prototype);
+            SetUpReadableStreamBYOBRequest(byobRequest, controller, view);
+            controller._byobRequest = byobRequest;
+        }
+        return controller._byobRequest;
+    }
+    function ReadableByteStreamControllerGetDesiredSize(controller) {
+        const state = controller._controlledReadableByteStream._state;
+        if (state === 'errored') {
+            return null;
+        }
+        if (state === 'closed') {
+            return 0;
+        }
+        return controller._strategyHWM - controller._queueTotalSize;
+    }
+    function ReadableByteStreamControllerRespond(controller, bytesWritten) {
+        const firstDescriptor = controller._pendingPullIntos.peek();
+        const state = controller._controlledReadableByteStream._state;
+        if (state === 'closed') {
+            if (bytesWritten !== 0) {
+                throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream');
+            }
+        }
+        else {
+            if (bytesWritten === 0) {
+                throw new TypeError('bytesWritten must be greater than 0 when calling respond() on a readable stream');
+            }
+            if (firstDescriptor.bytesFilled + bytesWritten > firstDescriptor.byteLength) {
+                throw new RangeError('bytesWritten out of range');
+            }
+        }
+        firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer);
+        ReadableByteStreamControllerRespondInternal(controller, bytesWritten);
+    }
+    function ReadableByteStreamControllerRespondWithNewView(controller, view) {
+        const firstDescriptor = controller._pendingPullIntos.peek();
+        const state = controller._controlledReadableByteStream._state;
+        if (state === 'closed') {
+            if (view.byteLength !== 0) {
+                throw new TypeError('The view\'s length must be 0 when calling respondWithNewView() on a closed stream');
+            }
+        }
+        else {
+            if (view.byteLength === 0) {
+                throw new TypeError('The view\'s length must be greater than 0 when calling respondWithNewView() on a readable stream');
+            }
+        }
+        if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) {
+            throw new RangeError('The region specified by view does not match byobRequest');
+        }
+        if (firstDescriptor.bufferByteLength !== view.buffer.byteLength) {
+            throw new RangeError('The buffer of view has different capacity than byobRequest');
+        }
+        if (firstDescriptor.bytesFilled + view.byteLength > firstDescriptor.byteLength) {
+            throw new RangeError('The region specified by view is larger than byobRequest');
+        }
+        const viewByteLength = view.byteLength;
+        firstDescriptor.buffer = TransferArrayBuffer(view.buffer);
+        ReadableByteStreamControllerRespondInternal(controller, viewByteLength);
+    }
+    function SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize) {
+        controller._controlledReadableByteStream = stream;
+        controller._pullAgain = false;
+        controller._pulling = false;
+        controller._byobRequest = null;
+        // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.
+        controller._queue = controller._queueTotalSize = undefined;
+        ResetQueue(controller);
+        controller._closeRequested = false;
+        controller._started = false;
+        controller._strategyHWM = highWaterMark;
+        controller._pullAlgorithm = pullAlgorithm;
+        controller._cancelAlgorithm = cancelAlgorithm;
+        controller._autoAllocateChunkSize = autoAllocateChunkSize;
+        controller._pendingPullIntos = new SimpleQueue();
+        stream._readableStreamController = controller;
+        const startResult = startAlgorithm();
+        uponPromise(promiseResolvedWith(startResult), () => {
+            controller._started = true;
+            ReadableByteStreamControllerCallPullIfNeeded(controller);
+        }, r => {
+            ReadableByteStreamControllerError(controller, r);
+        });
+    }
+    function SetUpReadableByteStreamControllerFromUnderlyingSource(stream, underlyingByteSource, highWaterMark) {
+        const controller = Object.create(ReadableByteStreamController.prototype);
+        let startAlgorithm = () => undefined;
+        let pullAlgorithm = () => promiseResolvedWith(undefined);
+        let cancelAlgorithm = () => promiseResolvedWith(undefined);
+        if (underlyingByteSource.start !== undefined) {
+            startAlgorithm = () => underlyingByteSource.start(controller);
+        }
+        if (underlyingByteSource.pull !== undefined) {
+            pullAlgorithm = () => underlyingByteSource.pull(controller);
+        }
+        if (underlyingByteSource.cancel !== undefined) {
+            cancelAlgorithm = reason => underlyingByteSource.cancel(reason);
+        }
+        const autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;
+        if (autoAllocateChunkSize === 0) {
+            throw new TypeError('autoAllocateChunkSize must be greater than 0');
+        }
+        SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize);
+    }
+    function SetUpReadableStreamBYOBRequest(request, controller, view) {
+        request._associatedReadableByteStreamController = controller;
+        request._view = view;
+    }
+    // Helper functions for the ReadableStreamBYOBRequest.
+    function byobRequestBrandCheckException(name) {
+        return new TypeError(`ReadableStreamBYOBRequest.prototype.${name} can only be used on a ReadableStreamBYOBRequest`);
+    }
+    // Helper functions for the ReadableByteStreamController.
+    function byteStreamControllerBrandCheckException(name) {
+        return new TypeError(`ReadableByteStreamController.prototype.${name} can only be used on a ReadableByteStreamController`);
+    }
+
+    // Abstract operations for the ReadableStream.
+    function AcquireReadableStreamBYOBReader(stream) {
+        return new ReadableStreamBYOBReader(stream);
+    }
+    // ReadableStream API exposed for controllers.
+    function ReadableStreamAddReadIntoRequest(stream, readIntoRequest) {
+        stream._reader._readIntoRequests.push(readIntoRequest);
+    }
+    function ReadableStreamFulfillReadIntoRequest(stream, chunk, done) {
+        const reader = stream._reader;
+        const readIntoRequest = reader._readIntoRequests.shift();
+        if (done) {
+            readIntoRequest._closeSteps(chunk);
+        }
+        else {
+            readIntoRequest._chunkSteps(chunk);
+        }
+    }
+    function ReadableStreamGetNumReadIntoRequests(stream) {
+        return stream._reader._readIntoRequests.length;
+    }
+    function ReadableStreamHasBYOBReader(stream) {
+        const reader = stream._reader;
+        if (reader === undefined) {
+            return false;
+        }
+        if (!IsReadableStreamBYOBReader(reader)) {
+            return false;
+        }
+        return true;
+    }
+    /**
+     * A BYOB reader vended by a {@link ReadableStream}.
+     *
+     * @public
+     */
+    class ReadableStreamBYOBReader {
+        constructor(stream) {
+            assertRequiredArgument(stream, 1, 'ReadableStreamBYOBReader');
+            assertReadableStream(stream, 'First parameter');
+            if (IsReadableStreamLocked(stream)) {
+                throw new TypeError('This stream has already been locked for exclusive reading by another reader');
+            }
+            if (!IsReadableByteStreamController(stream._readableStreamController)) {
+                throw new TypeError('Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte ' +
+                    'source');
+            }
+            ReadableStreamReaderGenericInitialize(this, stream);
+            this._readIntoRequests = new SimpleQueue();
+        }
+        /**
+         * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or
+         * the reader's lock is released before the stream finishes closing.
+         */
+        get closed() {
+            if (!IsReadableStreamBYOBReader(this)) {
+                return promiseRejectedWith(byobReaderBrandCheckException('closed'));
+            }
+            return this._closedPromise;
+        }
+        /**
+         * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.
+         */
+        cancel(reason = undefined) {
+            if (!IsReadableStreamBYOBReader(this)) {
+                return promiseRejectedWith(byobReaderBrandCheckException('cancel'));
+            }
+            if (this._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('cancel'));
+            }
+            return ReadableStreamReaderGenericCancel(this, reason);
+        }
+        /**
+         * Attempts to reads bytes into view, and returns a promise resolved with the result.
+         *
+         * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.
+         */
+        read(view) {
+            if (!IsReadableStreamBYOBReader(this)) {
+                return promiseRejectedWith(byobReaderBrandCheckException('read'));
+            }
+            if (!ArrayBuffer.isView(view)) {
+                return promiseRejectedWith(new TypeError('view must be an array buffer view'));
+            }
+            if (view.byteLength === 0) {
+                return promiseRejectedWith(new TypeError('view must have non-zero byteLength'));
+            }
+            if (view.buffer.byteLength === 0) {
+                return promiseRejectedWith(new TypeError(`view's buffer must have non-zero byteLength`));
+            }
+            if (IsDetachedBuffer(view.buffer)) ;
+            if (this._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('read from'));
+            }
+            let resolvePromise;
+            let rejectPromise;
+            const promise = newPromise((resolve, reject) => {
+                resolvePromise = resolve;
+                rejectPromise = reject;
+            });
+            const readIntoRequest = {
+                _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),
+                _closeSteps: chunk => resolvePromise({ value: chunk, done: true }),
+                _errorSteps: e => rejectPromise(e)
+            };
+            ReadableStreamBYOBReaderRead(this, view, readIntoRequest);
+            return promise;
+        }
+        /**
+         * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.
+         * If the associated stream is errored when the lock is released, the reader will appear errored in the same way
+         * from now on; otherwise, the reader will appear closed.
+         *
+         * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by
+         * the reader's {@link ReadableStreamBYOBReader.read | read()} method has not yet been settled. Attempting to
+         * do so will throw a `TypeError` and leave the reader locked to the stream.
+         */
+        releaseLock() {
+            if (!IsReadableStreamBYOBReader(this)) {
+                throw byobReaderBrandCheckException('releaseLock');
+            }
+            if (this._ownerReadableStream === undefined) {
+                return;
+            }
+            if (this._readIntoRequests.length > 0) {
+                throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');
+            }
+            ReadableStreamReaderGenericRelease(this);
+        }
+    }
+    Object.defineProperties(ReadableStreamBYOBReader.prototype, {
+        cancel: { enumerable: true },
+        read: { enumerable: true },
+        releaseLock: { enumerable: true },
+        closed: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableStreamBYOBReader.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableStreamBYOBReader',
+            configurable: true
+        });
+    }
+    // Abstract operations for the readers.
+    function IsReadableStreamBYOBReader(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_readIntoRequests')) {
+            return false;
+        }
+        return x instanceof ReadableStreamBYOBReader;
+    }
+    function ReadableStreamBYOBReaderRead(reader, view, readIntoRequest) {
+        const stream = reader._ownerReadableStream;
+        stream._disturbed = true;
+        if (stream._state === 'errored') {
+            readIntoRequest._errorSteps(stream._storedError);
+        }
+        else {
+            ReadableByteStreamControllerPullInto(stream._readableStreamController, view, readIntoRequest);
+        }
+    }
+    // Helper functions for the ReadableStreamBYOBReader.
+    function byobReaderBrandCheckException(name) {
+        return new TypeError(`ReadableStreamBYOBReader.prototype.${name} can only be used on a ReadableStreamBYOBReader`);
+    }
+
+    function ExtractHighWaterMark(strategy, defaultHWM) {
+        const { highWaterMark } = strategy;
+        if (highWaterMark === undefined) {
+            return defaultHWM;
+        }
+        if (NumberIsNaN(highWaterMark) || highWaterMark < 0) {
+            throw new RangeError('Invalid highWaterMark');
+        }
+        return highWaterMark;
+    }
+    function ExtractSizeAlgorithm(strategy) {
+        const { size } = strategy;
+        if (!size) {
+            return () => 1;
+        }
+        return size;
+    }
+
+    function convertQueuingStrategy(init, context) {
+        assertDictionary(init, context);
+        const highWaterMark = init === null || init === void 0 ? void 0 : init.highWaterMark;
+        const size = init === null || init === void 0 ? void 0 : init.size;
+        return {
+            highWaterMark: highWaterMark === undefined ? undefined : convertUnrestrictedDouble(highWaterMark),
+            size: size === undefined ? undefined : convertQueuingStrategySize(size, `${context} has member 'size' that`)
+        };
+    }
+    function convertQueuingStrategySize(fn, context) {
+        assertFunction(fn, context);
+        return chunk => convertUnrestrictedDouble(fn(chunk));
+    }
+
+    function convertUnderlyingSink(original, context) {
+        assertDictionary(original, context);
+        const abort = original === null || original === void 0 ? void 0 : original.abort;
+        const close = original === null || original === void 0 ? void 0 : original.close;
+        const start = original === null || original === void 0 ? void 0 : original.start;
+        const type = original === null || original === void 0 ? void 0 : original.type;
+        const write = original === null || original === void 0 ? void 0 : original.write;
+        return {
+            abort: abort === undefined ?
+                undefined :
+                convertUnderlyingSinkAbortCallback(abort, original, `${context} has member 'abort' that`),
+            close: close === undefined ?
+                undefined :
+                convertUnderlyingSinkCloseCallback(close, original, `${context} has member 'close' that`),
+            start: start === undefined ?
+                undefined :
+                convertUnderlyingSinkStartCallback(start, original, `${context} has member 'start' that`),
+            write: write === undefined ?
+                undefined :
+                convertUnderlyingSinkWriteCallback(write, original, `${context} has member 'write' that`),
+            type
+        };
+    }
+    function convertUnderlyingSinkAbortCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (reason) => promiseCall(fn, original, [reason]);
+    }
+    function convertUnderlyingSinkCloseCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return () => promiseCall(fn, original, []);
+    }
+    function convertUnderlyingSinkStartCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (controller) => reflectCall(fn, original, [controller]);
+    }
+    function convertUnderlyingSinkWriteCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (chunk, controller) => promiseCall(fn, original, [chunk, controller]);
+    }
+
+    function assertWritableStream(x, context) {
+        if (!IsWritableStream(x)) {
+            throw new TypeError(`${context} is not a WritableStream.`);
+        }
+    }
+
+    function isAbortSignal(value) {
+        if (typeof value !== 'object' || value === null) {
+            return false;
+        }
+        try {
+            return typeof value.aborted === 'boolean';
+        }
+        catch (_a) {
+            // AbortSignal.prototype.aborted throws if its brand check fails
+            return false;
+        }
+    }
+    const supportsAbortController = typeof AbortController === 'function';
+    /**
+     * Construct a new AbortController, if supported by the platform.
+     *
+     * @internal
+     */
+    function createAbortController() {
+        if (supportsAbortController) {
+            return new AbortController();
+        }
+        return undefined;
+    }
+
+    /**
+     * A writable stream represents a destination for data, into which you can write.
+     *
+     * @public
+     */
+    class WritableStream {
+        constructor(rawUnderlyingSink = {}, rawStrategy = {}) {
+            if (rawUnderlyingSink === undefined) {
+                rawUnderlyingSink = null;
+            }
+            else {
+                assertObject(rawUnderlyingSink, 'First parameter');
+            }
+            const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');
+            const underlyingSink = convertUnderlyingSink(rawUnderlyingSink, 'First parameter');
+            InitializeWritableStream(this);
+            const type = underlyingSink.type;
+            if (type !== undefined) {
+                throw new RangeError('Invalid type is specified');
+            }
+            const sizeAlgorithm = ExtractSizeAlgorithm(strategy);
+            const highWaterMark = ExtractHighWaterMark(strategy, 1);
+            SetUpWritableStreamDefaultControllerFromUnderlyingSink(this, underlyingSink, highWaterMark, sizeAlgorithm);
+        }
+        /**
+         * Returns whether or not the writable stream is locked to a writer.
+         */
+        get locked() {
+            if (!IsWritableStream(this)) {
+                throw streamBrandCheckException$2('locked');
+            }
+            return IsWritableStreamLocked(this);
+        }
+        /**
+         * Aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be
+         * immediately moved to an errored state, with any queued-up writes discarded. This will also execute any abort
+         * mechanism of the underlying sink.
+         *
+         * The returned promise will fulfill if the stream shuts down successfully, or reject if the underlying sink signaled
+         * that there was an error doing so. Additionally, it will reject with a `TypeError` (without attempting to cancel
+         * the stream) if the stream is currently locked.
+         */
+        abort(reason = undefined) {
+            if (!IsWritableStream(this)) {
+                return promiseRejectedWith(streamBrandCheckException$2('abort'));
+            }
+            if (IsWritableStreamLocked(this)) {
+                return promiseRejectedWith(new TypeError('Cannot abort a stream that already has a writer'));
+            }
+            return WritableStreamAbort(this, reason);
+        }
+        /**
+         * Closes the stream. The underlying sink will finish processing any previously-written chunks, before invoking its
+         * close behavior. During this time any further attempts to write will fail (without erroring the stream).
+         *
+         * The method returns a promise that will fulfill if all remaining chunks are successfully written and the stream
+         * successfully closes, or rejects if an error is encountered during this process. Additionally, it will reject with
+         * a `TypeError` (without attempting to cancel the stream) if the stream is currently locked.
+         */
+        close() {
+            if (!IsWritableStream(this)) {
+                return promiseRejectedWith(streamBrandCheckException$2('close'));
+            }
+            if (IsWritableStreamLocked(this)) {
+                return promiseRejectedWith(new TypeError('Cannot close a stream that already has a writer'));
+            }
+            if (WritableStreamCloseQueuedOrInFlight(this)) {
+                return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));
+            }
+            return WritableStreamClose(this);
+        }
+        /**
+         * Creates a {@link WritableStreamDefaultWriter | writer} and locks the stream to the new writer. While the stream
+         * is locked, no other writer can be acquired until this one is released.
+         *
+         * This functionality is especially useful for creating abstractions that desire the ability to write to a stream
+         * without interruption or interleaving. By getting a writer for the stream, you can ensure nobody else can write at
+         * the same time, which would cause the resulting written data to be unpredictable and probably useless.
+         */
+        getWriter() {
+            if (!IsWritableStream(this)) {
+                throw streamBrandCheckException$2('getWriter');
+            }
+            return AcquireWritableStreamDefaultWriter(this);
+        }
+    }
+    Object.defineProperties(WritableStream.prototype, {
+        abort: { enumerable: true },
+        close: { enumerable: true },
+        getWriter: { enumerable: true },
+        locked: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(WritableStream.prototype, SymbolPolyfill.toStringTag, {
+            value: 'WritableStream',
+            configurable: true
+        });
+    }
+    // Abstract operations for the WritableStream.
+    function AcquireWritableStreamDefaultWriter(stream) {
+        return new WritableStreamDefaultWriter(stream);
+    }
+    // Throws if and only if startAlgorithm throws.
+    function CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark = 1, sizeAlgorithm = () => 1) {
+        const stream = Object.create(WritableStream.prototype);
+        InitializeWritableStream(stream);
+        const controller = Object.create(WritableStreamDefaultController.prototype);
+        SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm);
+        return stream;
+    }
+    function InitializeWritableStream(stream) {
+        stream._state = 'writable';
+        // The error that will be reported by new method calls once the state becomes errored. Only set when [[state]] is
+        // 'erroring' or 'errored'. May be set to an undefined value.
+        stream._storedError = undefined;
+        stream._writer = undefined;
+        // Initialize to undefined first because the constructor of the controller checks this
+        // variable to validate the caller.
+        stream._writableStreamController = undefined;
+        // This queue is placed here instead of the writer class in order to allow for passing a writer to the next data
+        // producer without waiting for the queued writes to finish.
+        stream._writeRequests = new SimpleQueue();
+        // Write requests are removed from _writeRequests when write() is called on the underlying sink. This prevents
+        // them from being erroneously rejected on error. If a write() call is in-flight, the request is stored here.
+        stream._inFlightWriteRequest = undefined;
+        // The promise that was returned from writer.close(). Stored here because it may be fulfilled after the writer
+        // has been detached.
+        stream._closeRequest = undefined;
+        // Close request is removed from _closeRequest when close() is called on the underlying sink. This prevents it
+        // from being erroneously rejected on error. If a close() call is in-flight, the request is stored here.
+        stream._inFlightCloseRequest = undefined;
+        // The promise that was returned from writer.abort(). This may also be fulfilled after the writer has detached.
+        stream._pendingAbortRequest = undefined;
+        // The backpressure signal set by the controller.
+        stream._backpressure = false;
+    }
+    function IsWritableStream(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_writableStreamController')) {
+            return false;
+        }
+        return x instanceof WritableStream;
+    }
+    function IsWritableStreamLocked(stream) {
+        if (stream._writer === undefined) {
+            return false;
+        }
+        return true;
+    }
+    function WritableStreamAbort(stream, reason) {
+        var _a;
+        if (stream._state === 'closed' || stream._state === 'errored') {
+            return promiseResolvedWith(undefined);
+        }
+        stream._writableStreamController._abortReason = reason;
+        (_a = stream._writableStreamController._abortController) === null || _a === void 0 ? void 0 : _a.abort();
+        // TypeScript narrows the type of `stream._state` down to 'writable' | 'erroring',
+        // but it doesn't know that signaling abort runs author code that might have changed the state.
+        // Widen the type again by casting to WritableStreamState.
+        const state = stream._state;
+        if (state === 'closed' || state === 'errored') {
+            return promiseResolvedWith(undefined);
+        }
+        if (stream._pendingAbortRequest !== undefined) {
+            return stream._pendingAbortRequest._promise;
+        }
+        let wasAlreadyErroring = false;
+        if (state === 'erroring') {
+            wasAlreadyErroring = true;
+            // reason will not be used, so don't keep a reference to it.
+            reason = undefined;
+        }
+        const promise = newPromise((resolve, reject) => {
+            stream._pendingAbortRequest = {
+                _promise: undefined,
+                _resolve: resolve,
+                _reject: reject,
+                _reason: reason,
+                _wasAlreadyErroring: wasAlreadyErroring
+            };
+        });
+        stream._pendingAbortRequest._promise = promise;
+        if (!wasAlreadyErroring) {
+            WritableStreamStartErroring(stream, reason);
+        }
+        return promise;
+    }
+    function WritableStreamClose(stream) {
+        const state = stream._state;
+        if (state === 'closed' || state === 'errored') {
+            return promiseRejectedWith(new TypeError(`The stream (in ${state} state) is not in the writable state and cannot be closed`));
+        }
+        const promise = newPromise((resolve, reject) => {
+            const closeRequest = {
+                _resolve: resolve,
+                _reject: reject
+            };
+            stream._closeRequest = closeRequest;
+        });
+        const writer = stream._writer;
+        if (writer !== undefined && stream._backpressure && state === 'writable') {
+            defaultWriterReadyPromiseResolve(writer);
+        }
+        WritableStreamDefaultControllerClose(stream._writableStreamController);
+        return promise;
+    }
+    // WritableStream API exposed for controllers.
+    function WritableStreamAddWriteRequest(stream) {
+        const promise = newPromise((resolve, reject) => {
+            const writeRequest = {
+                _resolve: resolve,
+                _reject: reject
+            };
+            stream._writeRequests.push(writeRequest);
+        });
+        return promise;
+    }
+    function WritableStreamDealWithRejection(stream, error) {
+        const state = stream._state;
+        if (state === 'writable') {
+            WritableStreamStartErroring(stream, error);
+            return;
+        }
+        WritableStreamFinishErroring(stream);
+    }
+    function WritableStreamStartErroring(stream, reason) {
+        const controller = stream._writableStreamController;
+        stream._state = 'erroring';
+        stream._storedError = reason;
+        const writer = stream._writer;
+        if (writer !== undefined) {
+            WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);
+        }
+        if (!WritableStreamHasOperationMarkedInFlight(stream) && controller._started) {
+            WritableStreamFinishErroring(stream);
+        }
+    }
+    function WritableStreamFinishErroring(stream) {
+        stream._state = 'errored';
+        stream._writableStreamController[ErrorSteps]();
+        const storedError = stream._storedError;
+        stream._writeRequests.forEach(writeRequest => {
+            writeRequest._reject(storedError);
+        });
+        stream._writeRequests = new SimpleQueue();
+        if (stream._pendingAbortRequest === undefined) {
+            WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+            return;
+        }
+        const abortRequest = stream._pendingAbortRequest;
+        stream._pendingAbortRequest = undefined;
+        if (abortRequest._wasAlreadyErroring) {
+            abortRequest._reject(storedError);
+            WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+            return;
+        }
+        const promise = stream._writableStreamController[AbortSteps](abortRequest._reason);
+        uponPromise(promise, () => {
+            abortRequest._resolve();
+            WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+        }, (reason) => {
+            abortRequest._reject(reason);
+            WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+        });
+    }
+    function WritableStreamFinishInFlightWrite(stream) {
+        stream._inFlightWriteRequest._resolve(undefined);
+        stream._inFlightWriteRequest = undefined;
+    }
+    function WritableStreamFinishInFlightWriteWithError(stream, error) {
+        stream._inFlightWriteRequest._reject(error);
+        stream._inFlightWriteRequest = undefined;
+        WritableStreamDealWithRejection(stream, error);
+    }
+    function WritableStreamFinishInFlightClose(stream) {
+        stream._inFlightCloseRequest._resolve(undefined);
+        stream._inFlightCloseRequest = undefined;
+        const state = stream._state;
+        if (state === 'erroring') {
+            // The error was too late to do anything, so it is ignored.
+            stream._storedError = undefined;
+            if (stream._pendingAbortRequest !== undefined) {
+                stream._pendingAbortRequest._resolve();
+                stream._pendingAbortRequest = undefined;
+            }
+        }
+        stream._state = 'closed';
+        const writer = stream._writer;
+        if (writer !== undefined) {
+            defaultWriterClosedPromiseResolve(writer);
+        }
+    }
+    function WritableStreamFinishInFlightCloseWithError(stream, error) {
+        stream._inFlightCloseRequest._reject(error);
+        stream._inFlightCloseRequest = undefined;
+        // Never execute sink abort() after sink close().
+        if (stream._pendingAbortRequest !== undefined) {
+            stream._pendingAbortRequest._reject(error);
+            stream._pendingAbortRequest = undefined;
+        }
+        WritableStreamDealWithRejection(stream, error);
+    }
+    // TODO(ricea): Fix alphabetical order.
+    function WritableStreamCloseQueuedOrInFlight(stream) {
+        if (stream._closeRequest === undefined && stream._inFlightCloseRequest === undefined) {
+            return false;
+        }
+        return true;
+    }
+    function WritableStreamHasOperationMarkedInFlight(stream) {
+        if (stream._inFlightWriteRequest === undefined && stream._inFlightCloseRequest === undefined) {
+            return false;
+        }
+        return true;
+    }
+    function WritableStreamMarkCloseRequestInFlight(stream) {
+        stream._inFlightCloseRequest = stream._closeRequest;
+        stream._closeRequest = undefined;
+    }
+    function WritableStreamMarkFirstWriteRequestInFlight(stream) {
+        stream._inFlightWriteRequest = stream._writeRequests.shift();
+    }
+    function WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream) {
+        if (stream._closeRequest !== undefined) {
+            stream._closeRequest._reject(stream._storedError);
+            stream._closeRequest = undefined;
+        }
+        const writer = stream._writer;
+        if (writer !== undefined) {
+            defaultWriterClosedPromiseReject(writer, stream._storedError);
+        }
+    }
+    function WritableStreamUpdateBackpressure(stream, backpressure) {
+        const writer = stream._writer;
+        if (writer !== undefined && backpressure !== stream._backpressure) {
+            if (backpressure) {
+                defaultWriterReadyPromiseReset(writer);
+            }
+            else {
+                defaultWriterReadyPromiseResolve(writer);
+            }
+        }
+        stream._backpressure = backpressure;
+    }
+    /**
+     * A default writer vended by a {@link WritableStream}.
+     *
+     * @public
+     */
+    class WritableStreamDefaultWriter {
+        constructor(stream) {
+            assertRequiredArgument(stream, 1, 'WritableStreamDefaultWriter');
+            assertWritableStream(stream, 'First parameter');
+            if (IsWritableStreamLocked(stream)) {
+                throw new TypeError('This stream has already been locked for exclusive writing by another writer');
+            }
+            this._ownerWritableStream = stream;
+            stream._writer = this;
+            const state = stream._state;
+            if (state === 'writable') {
+                if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._backpressure) {
+                    defaultWriterReadyPromiseInitialize(this);
+                }
+                else {
+                    defaultWriterReadyPromiseInitializeAsResolved(this);
+                }
+                defaultWriterClosedPromiseInitialize(this);
+            }
+            else if (state === 'erroring') {
+                defaultWriterReadyPromiseInitializeAsRejected(this, stream._storedError);
+                defaultWriterClosedPromiseInitialize(this);
+            }
+            else if (state === 'closed') {
+                defaultWriterReadyPromiseInitializeAsResolved(this);
+                defaultWriterClosedPromiseInitializeAsResolved(this);
+            }
+            else {
+                const storedError = stream._storedError;
+                defaultWriterReadyPromiseInitializeAsRejected(this, storedError);
+                defaultWriterClosedPromiseInitializeAsRejected(this, storedError);
+            }
+        }
+        /**
+         * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or
+         * the writer’s lock is released before the stream finishes closing.
+         */
+        get closed() {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                return promiseRejectedWith(defaultWriterBrandCheckException('closed'));
+            }
+            return this._closedPromise;
+        }
+        /**
+         * Returns the desired size to fill the stream’s internal queue. It can be negative, if the queue is over-full.
+         * A producer can use this information to determine the right amount of data to write.
+         *
+         * It will be `null` if the stream cannot be successfully written to (due to either being errored, or having an abort
+         * queued up). It will return zero if the stream is closed. And the getter will throw an exception if invoked when
+         * the writer’s lock is released.
+         */
+        get desiredSize() {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                throw defaultWriterBrandCheckException('desiredSize');
+            }
+            if (this._ownerWritableStream === undefined) {
+                throw defaultWriterLockException('desiredSize');
+            }
+            return WritableStreamDefaultWriterGetDesiredSize(this);
+        }
+        /**
+         * Returns a promise that will be fulfilled when the desired size to fill the stream’s internal queue transitions
+         * from non-positive to positive, signaling that it is no longer applying backpressure. Once the desired size dips
+         * back to zero or below, the getter will return a new promise that stays pending until the next transition.
+         *
+         * If the stream becomes errored or aborted, or the writer’s lock is released, the returned promise will become
+         * rejected.
+         */
+        get ready() {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                return promiseRejectedWith(defaultWriterBrandCheckException('ready'));
+            }
+            return this._readyPromise;
+        }
+        /**
+         * If the reader is active, behaves the same as {@link WritableStream.abort | stream.abort(reason)}.
+         */
+        abort(reason = undefined) {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                return promiseRejectedWith(defaultWriterBrandCheckException('abort'));
+            }
+            if (this._ownerWritableStream === undefined) {
+                return promiseRejectedWith(defaultWriterLockException('abort'));
+            }
+            return WritableStreamDefaultWriterAbort(this, reason);
+        }
+        /**
+         * If the reader is active, behaves the same as {@link WritableStream.close | stream.close()}.
+         */
+        close() {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                return promiseRejectedWith(defaultWriterBrandCheckException('close'));
+            }
+            const stream = this._ownerWritableStream;
+            if (stream === undefined) {
+                return promiseRejectedWith(defaultWriterLockException('close'));
+            }
+            if (WritableStreamCloseQueuedOrInFlight(stream)) {
+                return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));
+            }
+            return WritableStreamDefaultWriterClose(this);
+        }
+        /**
+         * Releases the writer’s lock on the corresponding stream. After the lock is released, the writer is no longer active.
+         * If the associated stream is errored when the lock is released, the writer will appear errored in the same way from
+         * now on; otherwise, the writer will appear closed.
+         *
+         * Note that the lock can still be released even if some ongoing writes have not yet finished (i.e. even if the
+         * promises returned from previous calls to {@link WritableStreamDefaultWriter.write | write()} have not yet settled).
+         * It’s not necessary to hold the lock on the writer for the duration of the write; the lock instead simply prevents
+         * other producers from writing in an interleaved manner.
+         */
+        releaseLock() {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                throw defaultWriterBrandCheckException('releaseLock');
+            }
+            const stream = this._ownerWritableStream;
+            if (stream === undefined) {
+                return;
+            }
+            WritableStreamDefaultWriterRelease(this);
+        }
+        write(chunk = undefined) {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                return promiseRejectedWith(defaultWriterBrandCheckException('write'));
+            }
+            if (this._ownerWritableStream === undefined) {
+                return promiseRejectedWith(defaultWriterLockException('write to'));
+            }
+            return WritableStreamDefaultWriterWrite(this, chunk);
+        }
+    }
+    Object.defineProperties(WritableStreamDefaultWriter.prototype, {
+        abort: { enumerable: true },
+        close: { enumerable: true },
+        releaseLock: { enumerable: true },
+        write: { enumerable: true },
+        closed: { enumerable: true },
+        desiredSize: { enumerable: true },
+        ready: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(WritableStreamDefaultWriter.prototype, SymbolPolyfill.toStringTag, {
+            value: 'WritableStreamDefaultWriter',
+            configurable: true
+        });
+    }
+    // Abstract operations for the WritableStreamDefaultWriter.
+    function IsWritableStreamDefaultWriter(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) {
+            return false;
+        }
+        return x instanceof WritableStreamDefaultWriter;
+    }
+    // A client of WritableStreamDefaultWriter may use these functions directly to bypass state check.
+    function WritableStreamDefaultWriterAbort(writer, reason) {
+        const stream = writer._ownerWritableStream;
+        return WritableStreamAbort(stream, reason);
+    }
+    function WritableStreamDefaultWriterClose(writer) {
+        const stream = writer._ownerWritableStream;
+        return WritableStreamClose(stream);
+    }
+    function WritableStreamDefaultWriterCloseWithErrorPropagation(writer) {
+        const stream = writer._ownerWritableStream;
+        const state = stream._state;
+        if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {
+            return promiseResolvedWith(undefined);
+        }
+        if (state === 'errored') {
+            return promiseRejectedWith(stream._storedError);
+        }
+        return WritableStreamDefaultWriterClose(writer);
+    }
+    function WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, error) {
+        if (writer._closedPromiseState === 'pending') {
+            defaultWriterClosedPromiseReject(writer, error);
+        }
+        else {
+            defaultWriterClosedPromiseResetToRejected(writer, error);
+        }
+    }
+    function WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, error) {
+        if (writer._readyPromiseState === 'pending') {
+            defaultWriterReadyPromiseReject(writer, error);
+        }
+        else {
+            defaultWriterReadyPromiseResetToRejected(writer, error);
+        }
+    }
+    function WritableStreamDefaultWriterGetDesiredSize(writer) {
+        const stream = writer._ownerWritableStream;
+        const state = stream._state;
+        if (state === 'errored' || state === 'erroring') {
+            return null;
+        }
+        if (state === 'closed') {
+            return 0;
+        }
+        return WritableStreamDefaultControllerGetDesiredSize(stream._writableStreamController);
+    }
+    function WritableStreamDefaultWriterRelease(writer) {
+        const stream = writer._ownerWritableStream;
+        const releasedError = new TypeError(`Writer was released and can no longer be used to monitor the stream's closedness`);
+        WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, releasedError);
+        // The state transitions to "errored" before the sink abort() method runs, but the writer.closed promise is not
+        // rejected until afterwards. This means that simply testing state will not work.
+        WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, releasedError);
+        stream._writer = undefined;
+        writer._ownerWritableStream = undefined;
+    }
+    function WritableStreamDefaultWriterWrite(writer, chunk) {
+        const stream = writer._ownerWritableStream;
+        const controller = stream._writableStreamController;
+        const chunkSize = WritableStreamDefaultControllerGetChunkSize(controller, chunk);
+        if (stream !== writer._ownerWritableStream) {
+            return promiseRejectedWith(defaultWriterLockException('write to'));
+        }
+        const state = stream._state;
+        if (state === 'errored') {
+            return promiseRejectedWith(stream._storedError);
+        }
+        if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {
+            return promiseRejectedWith(new TypeError('The stream is closing or closed and cannot be written to'));
+        }
+        if (state === 'erroring') {
+            return promiseRejectedWith(stream._storedError);
+        }
+        const promise = WritableStreamAddWriteRequest(stream);
+        WritableStreamDefaultControllerWrite(controller, chunk, chunkSize);
+        return promise;
+    }
+    const closeSentinel = {};
+    /**
+     * Allows control of a {@link WritableStream | writable stream}'s state and internal queue.
+     *
+     * @public
+     */
+    class WritableStreamDefaultController {
+        constructor() {
+            throw new TypeError('Illegal constructor');
+        }
+        /**
+         * The reason which was passed to `WritableStream.abort(reason)` when the stream was aborted.
+         *
+         * @deprecated
+         *  This property has been removed from the specification, see https://github.com/whatwg/streams/pull/1177.
+         *  Use {@link WritableStreamDefaultController.signal}'s `reason` instead.
+         */
+        get abortReason() {
+            if (!IsWritableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$2('abortReason');
+            }
+            return this._abortReason;
+        }
+        /**
+         * An `AbortSignal` that can be used to abort the pending write or close operation when the stream is aborted.
+         */
+        get signal() {
+            if (!IsWritableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$2('signal');
+            }
+            if (this._abortController === undefined) {
+                // Older browsers or older Node versions may not support `AbortController` or `AbortSignal`.
+                // We don't want to bundle and ship an `AbortController` polyfill together with our polyfill,
+                // so instead we only implement support for `signal` if we find a global `AbortController` constructor.
+                throw new TypeError('WritableStreamDefaultController.prototype.signal is not supported');
+            }
+            return this._abortController.signal;
+        }
+        /**
+         * Closes the controlled writable stream, making all future interactions with it fail with the given error `e`.
+         *
+         * This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying
+         * sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the
+         * normal lifecycle of interactions with the underlying sink.
+         */
+        error(e = undefined) {
+            if (!IsWritableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$2('error');
+            }
+            const state = this._controlledWritableStream._state;
+            if (state !== 'writable') {
+                // The stream is closed, errored or will be soon. The sink can't do anything useful if it gets an error here, so
+                // just treat it as a no-op.
+                return;
+            }
+            WritableStreamDefaultControllerError(this, e);
+        }
+        /** @internal */
+        [AbortSteps](reason) {
+            const result = this._abortAlgorithm(reason);
+            WritableStreamDefaultControllerClearAlgorithms(this);
+            return result;
+        }
+        /** @internal */
+        [ErrorSteps]() {
+            ResetQueue(this);
+        }
+    }
+    Object.defineProperties(WritableStreamDefaultController.prototype, {
+        abortReason: { enumerable: true },
+        signal: { enumerable: true },
+        error: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(WritableStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+            value: 'WritableStreamDefaultController',
+            configurable: true
+        });
+    }
+    // Abstract operations implementing interface required by the WritableStream.
+    function IsWritableStreamDefaultController(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_controlledWritableStream')) {
+            return false;
+        }
+        return x instanceof WritableStreamDefaultController;
+    }
+    function SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm) {
+        controller._controlledWritableStream = stream;
+        stream._writableStreamController = controller;
+        // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.
+        controller._queue = undefined;
+        controller._queueTotalSize = undefined;
+        ResetQueue(controller);
+        controller._abortReason = undefined;
+        controller._abortController = createAbortController();
+        controller._started = false;
+        controller._strategySizeAlgorithm = sizeAlgorithm;
+        controller._strategyHWM = highWaterMark;
+        controller._writeAlgorithm = writeAlgorithm;
+        controller._closeAlgorithm = closeAlgorithm;
+        controller._abortAlgorithm = abortAlgorithm;
+        const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+        WritableStreamUpdateBackpressure(stream, backpressure);
+        const startResult = startAlgorithm();
+        const startPromise = promiseResolvedWith(startResult);
+        uponPromise(startPromise, () => {
+            controller._started = true;
+            WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+        }, r => {
+            controller._started = true;
+            WritableStreamDealWithRejection(stream, r);
+        });
+    }
+    function SetUpWritableStreamDefaultControllerFromUnderlyingSink(stream, underlyingSink, highWaterMark, sizeAlgorithm) {
+        const controller = Object.create(WritableStreamDefaultController.prototype);
+        let startAlgorithm = () => undefined;
+        let writeAlgorithm = () => promiseResolvedWith(undefined);
+        let closeAlgorithm = () => promiseResolvedWith(undefined);
+        let abortAlgorithm = () => promiseResolvedWith(undefined);
+        if (underlyingSink.start !== undefined) {
+            startAlgorithm = () => underlyingSink.start(controller);
+        }
+        if (underlyingSink.write !== undefined) {
+            writeAlgorithm = chunk => underlyingSink.write(chunk, controller);
+        }
+        if (underlyingSink.close !== undefined) {
+            closeAlgorithm = () => underlyingSink.close();
+        }
+        if (underlyingSink.abort !== undefined) {
+            abortAlgorithm = reason => underlyingSink.abort(reason);
+        }
+        SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm);
+    }
+    // ClearAlgorithms may be called twice. Erroring the same stream in multiple ways will often result in redundant calls.
+    function WritableStreamDefaultControllerClearAlgorithms(controller) {
+        controller._writeAlgorithm = undefined;
+        controller._closeAlgorithm = undefined;
+        controller._abortAlgorithm = undefined;
+        controller._strategySizeAlgorithm = undefined;
+    }
+    function WritableStreamDefaultControllerClose(controller) {
+        EnqueueValueWithSize(controller, closeSentinel, 0);
+        WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+    }
+    function WritableStreamDefaultControllerGetChunkSize(controller, chunk) {
+        try {
+            return controller._strategySizeAlgorithm(chunk);
+        }
+        catch (chunkSizeE) {
+            WritableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE);
+            return 1;
+        }
+    }
+    function WritableStreamDefaultControllerGetDesiredSize(controller) {
+        return controller._strategyHWM - controller._queueTotalSize;
+    }
+    function WritableStreamDefaultControllerWrite(controller, chunk, chunkSize) {
+        try {
+            EnqueueValueWithSize(controller, chunk, chunkSize);
+        }
+        catch (enqueueE) {
+            WritableStreamDefaultControllerErrorIfNeeded(controller, enqueueE);
+            return;
+        }
+        const stream = controller._controlledWritableStream;
+        if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._state === 'writable') {
+            const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+            WritableStreamUpdateBackpressure(stream, backpressure);
+        }
+        WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+    }
+    // Abstract operations for the WritableStreamDefaultController.
+    function WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller) {
+        const stream = controller._controlledWritableStream;
+        if (!controller._started) {
+            return;
+        }
+        if (stream._inFlightWriteRequest !== undefined) {
+            return;
+        }
+        const state = stream._state;
+        if (state === 'erroring') {
+            WritableStreamFinishErroring(stream);
+            return;
+        }
+        if (controller._queue.length === 0) {
+            return;
+        }
+        const value = PeekQueueValue(controller);
+        if (value === closeSentinel) {
+            WritableStreamDefaultControllerProcessClose(controller);
+        }
+        else {
+            WritableStreamDefaultControllerProcessWrite(controller, value);
+        }
+    }
+    function WritableStreamDefaultControllerErrorIfNeeded(controller, error) {
+        if (controller._controlledWritableStream._state === 'writable') {
+            WritableStreamDefaultControllerError(controller, error);
+        }
+    }
+    function WritableStreamDefaultControllerProcessClose(controller) {
+        const stream = controller._controlledWritableStream;
+        WritableStreamMarkCloseRequestInFlight(stream);
+        DequeueValue(controller);
+        const sinkClosePromise = controller._closeAlgorithm();
+        WritableStreamDefaultControllerClearAlgorithms(controller);
+        uponPromise(sinkClosePromise, () => {
+            WritableStreamFinishInFlightClose(stream);
+        }, reason => {
+            WritableStreamFinishInFlightCloseWithError(stream, reason);
+        });
+    }
+    function WritableStreamDefaultControllerProcessWrite(controller, chunk) {
+        const stream = controller._controlledWritableStream;
+        WritableStreamMarkFirstWriteRequestInFlight(stream);
+        const sinkWritePromise = controller._writeAlgorithm(chunk);
+        uponPromise(sinkWritePromise, () => {
+            WritableStreamFinishInFlightWrite(stream);
+            const state = stream._state;
+            DequeueValue(controller);
+            if (!WritableStreamCloseQueuedOrInFlight(stream) && state === 'writable') {
+                const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+                WritableStreamUpdateBackpressure(stream, backpressure);
+            }
+            WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+        }, reason => {
+            if (stream._state === 'writable') {
+                WritableStreamDefaultControllerClearAlgorithms(controller);
+            }
+            WritableStreamFinishInFlightWriteWithError(stream, reason);
+        });
+    }
+    function WritableStreamDefaultControllerGetBackpressure(controller) {
+        const desiredSize = WritableStreamDefaultControllerGetDesiredSize(controller);
+        return desiredSize <= 0;
+    }
+    // A client of WritableStreamDefaultController may use these functions directly to bypass state check.
+    function WritableStreamDefaultControllerError(controller, error) {
+        const stream = controller._controlledWritableStream;
+        WritableStreamDefaultControllerClearAlgorithms(controller);
+        WritableStreamStartErroring(stream, error);
+    }
+    // Helper functions for the WritableStream.
+    function streamBrandCheckException$2(name) {
+        return new TypeError(`WritableStream.prototype.${name} can only be used on a WritableStream`);
+    }
+    // Helper functions for the WritableStreamDefaultController.
+    function defaultControllerBrandCheckException$2(name) {
+        return new TypeError(`WritableStreamDefaultController.prototype.${name} can only be used on a WritableStreamDefaultController`);
+    }
+    // Helper functions for the WritableStreamDefaultWriter.
+    function defaultWriterBrandCheckException(name) {
+        return new TypeError(`WritableStreamDefaultWriter.prototype.${name} can only be used on a WritableStreamDefaultWriter`);
+    }
+    function defaultWriterLockException(name) {
+        return new TypeError('Cannot ' + name + ' a stream using a released writer');
+    }
+    function defaultWriterClosedPromiseInitialize(writer) {
+        writer._closedPromise = newPromise((resolve, reject) => {
+            writer._closedPromise_resolve = resolve;
+            writer._closedPromise_reject = reject;
+            writer._closedPromiseState = 'pending';
+        });
+    }
+    function defaultWriterClosedPromiseInitializeAsRejected(writer, reason) {
+        defaultWriterClosedPromiseInitialize(writer);
+        defaultWriterClosedPromiseReject(writer, reason);
+    }
+    function defaultWriterClosedPromiseInitializeAsResolved(writer) {
+        defaultWriterClosedPromiseInitialize(writer);
+        defaultWriterClosedPromiseResolve(writer);
+    }
+    function defaultWriterClosedPromiseReject(writer, reason) {
+        if (writer._closedPromise_reject === undefined) {
+            return;
+        }
+        setPromiseIsHandledToTrue(writer._closedPromise);
+        writer._closedPromise_reject(reason);
+        writer._closedPromise_resolve = undefined;
+        writer._closedPromise_reject = undefined;
+        writer._closedPromiseState = 'rejected';
+    }
+    function defaultWriterClosedPromiseResetToRejected(writer, reason) {
+        defaultWriterClosedPromiseInitializeAsRejected(writer, reason);
+    }
+    function defaultWriterClosedPromiseResolve(writer) {
+        if (writer._closedPromise_resolve === undefined) {
+            return;
+        }
+        writer._closedPromise_resolve(undefined);
+        writer._closedPromise_resolve = undefined;
+        writer._closedPromise_reject = undefined;
+        writer._closedPromiseState = 'resolved';
+    }
+    function defaultWriterReadyPromiseInitialize(writer) {
+        writer._readyPromise = newPromise((resolve, reject) => {
+            writer._readyPromise_resolve = resolve;
+            writer._readyPromise_reject = reject;
+        });
+        writer._readyPromiseState = 'pending';
+    }
+    function defaultWriterReadyPromiseInitializeAsRejected(writer, reason) {
+        defaultWriterReadyPromiseInitialize(writer);
+        defaultWriterReadyPromiseReject(writer, reason);
+    }
+    function defaultWriterReadyPromiseInitializeAsResolved(writer) {
+        defaultWriterReadyPromiseInitialize(writer);
+        defaultWriterReadyPromiseResolve(writer);
+    }
+    function defaultWriterReadyPromiseReject(writer, reason) {
+        if (writer._readyPromise_reject === undefined) {
+            return;
+        }
+        setPromiseIsHandledToTrue(writer._readyPromise);
+        writer._readyPromise_reject(reason);
+        writer._readyPromise_resolve = undefined;
+        writer._readyPromise_reject = undefined;
+        writer._readyPromiseState = 'rejected';
+    }
+    function defaultWriterReadyPromiseReset(writer) {
+        defaultWriterReadyPromiseInitialize(writer);
+    }
+    function defaultWriterReadyPromiseResetToRejected(writer, reason) {
+        defaultWriterReadyPromiseInitializeAsRejected(writer, reason);
+    }
+    function defaultWriterReadyPromiseResolve(writer) {
+        if (writer._readyPromise_resolve === undefined) {
+            return;
+        }
+        writer._readyPromise_resolve(undefined);
+        writer._readyPromise_resolve = undefined;
+        writer._readyPromise_reject = undefined;
+        writer._readyPromiseState = 'fulfilled';
+    }
+
+    /// <reference lib="dom" />
+    const NativeDOMException = typeof DOMException !== 'undefined' ? DOMException : undefined;
+
+    /// <reference types="node" />
+    function isDOMExceptionConstructor(ctor) {
+        if (!(typeof ctor === 'function' || typeof ctor === 'object')) {
+            return false;
+        }
+        try {
+            new ctor();
+            return true;
+        }
+        catch (_a) {
+            return false;
+        }
+    }
+    function createDOMExceptionPolyfill() {
+        // eslint-disable-next-line no-shadow
+        const ctor = function DOMException(message, name) {
+            this.message = message || '';
+            this.name = name || 'Error';
+            if (Error.captureStackTrace) {
+                Error.captureStackTrace(this, this.constructor);
+            }
+        };
+        ctor.prototype = Object.create(Error.prototype);
+        Object.defineProperty(ctor.prototype, 'constructor', { value: ctor, writable: true, configurable: true });
+        return ctor;
+    }
+    // eslint-disable-next-line no-redeclare
+    const DOMException$1 = isDOMExceptionConstructor(NativeDOMException) ? NativeDOMException : createDOMExceptionPolyfill();
+
+    function ReadableStreamPipeTo(source, dest, preventClose, preventAbort, preventCancel, signal) {
+        const reader = AcquireReadableStreamDefaultReader(source);
+        const writer = AcquireWritableStreamDefaultWriter(dest);
+        source._disturbed = true;
+        let shuttingDown = false;
+        // This is used to keep track of the spec's requirement that we wait for ongoing writes during shutdown.
+        let currentWrite = promiseResolvedWith(undefined);
+        return newPromise((resolve, reject) => {
+            let abortAlgorithm;
+            if (signal !== undefined) {
+                abortAlgorithm = () => {
+                    const error = new DOMException$1('Aborted', 'AbortError');
+                    const actions = [];
+                    if (!preventAbort) {
+                        actions.push(() => {
+                            if (dest._state === 'writable') {
+                                return WritableStreamAbort(dest, error);
+                            }
+                            return promiseResolvedWith(undefined);
+                        });
+                    }
+                    if (!preventCancel) {
+                        actions.push(() => {
+                            if (source._state === 'readable') {
+                                return ReadableStreamCancel(source, error);
+                            }
+                            return promiseResolvedWith(undefined);
+                        });
+                    }
+                    shutdownWithAction(() => Promise.all(actions.map(action => action())), true, error);
+                };
+                if (signal.aborted) {
+                    abortAlgorithm();
+                    return;
+                }
+                signal.addEventListener('abort', abortAlgorithm);
+            }
+            // Using reader and writer, read all chunks from this and write them to dest
+            // - Backpressure must be enforced
+            // - Shutdown must stop all activity
+            function pipeLoop() {
+                return newPromise((resolveLoop, rejectLoop) => {
+                    function next(done) {
+                        if (done) {
+                            resolveLoop();
+                        }
+                        else {
+                            // Use `PerformPromiseThen` instead of `uponPromise` to avoid
+                            // adding unnecessary `.catch(rethrowAssertionErrorRejection)` handlers
+                            PerformPromiseThen(pipeStep(), next, rejectLoop);
+                        }
+                    }
+                    next(false);
+                });
+            }
+            function pipeStep() {
+                if (shuttingDown) {
+                    return promiseResolvedWith(true);
+                }
+                return PerformPromiseThen(writer._readyPromise, () => {
+                    return newPromise((resolveRead, rejectRead) => {
+                        ReadableStreamDefaultReaderRead(reader, {
+                            _chunkSteps: chunk => {
+                                currentWrite = PerformPromiseThen(WritableStreamDefaultWriterWrite(writer, chunk), undefined, noop);
+                                resolveRead(false);
+                            },
+                            _closeSteps: () => resolveRead(true),
+                            _errorSteps: rejectRead
+                        });
+                    });
+                });
+            }
+            // Errors must be propagated forward
+            isOrBecomesErrored(source, reader._closedPromise, storedError => {
+                if (!preventAbort) {
+                    shutdownWithAction(() => WritableStreamAbort(dest, storedError), true, storedError);
+                }
+                else {
+                    shutdown(true, storedError);
+                }
+            });
+            // Errors must be propagated backward
+            isOrBecomesErrored(dest, writer._closedPromise, storedError => {
+                if (!preventCancel) {
+                    shutdownWithAction(() => ReadableStreamCancel(source, storedError), true, storedError);
+                }
+                else {
+                    shutdown(true, storedError);
+                }
+            });
+            // Closing must be propagated forward
+            isOrBecomesClosed(source, reader._closedPromise, () => {
+                if (!preventClose) {
+                    shutdownWithAction(() => WritableStreamDefaultWriterCloseWithErrorPropagation(writer));
+                }
+                else {
+                    shutdown();
+                }
+            });
+            // Closing must be propagated backward
+            if (WritableStreamCloseQueuedOrInFlight(dest) || dest._state === 'closed') {
+                const destClosed = new TypeError('the destination writable stream closed before all data could be piped to it');
+                if (!preventCancel) {
+                    shutdownWithAction(() => ReadableStreamCancel(source, destClosed), true, destClosed);
+                }
+                else {
+                    shutdown(true, destClosed);
+                }
+            }
+            setPromiseIsHandledToTrue(pipeLoop());
+            function waitForWritesToFinish() {
+                // Another write may have started while we were waiting on this currentWrite, so we have to be sure to wait
+                // for that too.
+                const oldCurrentWrite = currentWrite;
+                return PerformPromiseThen(currentWrite, () => oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined);
+            }
+            function isOrBecomesErrored(stream, promise, action) {
+                if (stream._state === 'errored') {
+                    action(stream._storedError);
+                }
+                else {
+                    uponRejection(promise, action);
+                }
+            }
+            function isOrBecomesClosed(stream, promise, action) {
+                if (stream._state === 'closed') {
+                    action();
+                }
+                else {
+                    uponFulfillment(promise, action);
+                }
+            }
+            function shutdownWithAction(action, originalIsError, originalError) {
+                if (shuttingDown) {
+                    return;
+                }
+                shuttingDown = true;
+                if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {
+                    uponFulfillment(waitForWritesToFinish(), doTheRest);
+                }
+                else {
+                    doTheRest();
+                }
+                function doTheRest() {
+                    uponPromise(action(), () => finalize(originalIsError, originalError), newError => finalize(true, newError));
+                }
+            }
+            function shutdown(isError, error) {
+                if (shuttingDown) {
+                    return;
+                }
+                shuttingDown = true;
+                if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {
+                    uponFulfillment(waitForWritesToFinish(), () => finalize(isError, error));
+                }
+                else {
+                    finalize(isError, error);
+                }
+            }
+            function finalize(isError, error) {
+                WritableStreamDefaultWriterRelease(writer);
+                ReadableStreamReaderGenericRelease(reader);
+                if (signal !== undefined) {
+                    signal.removeEventListener('abort', abortAlgorithm);
+                }
+                if (isError) {
+                    reject(error);
+                }
+                else {
+                    resolve(undefined);
+                }
+            }
+        });
+    }
+
+    /**
+     * Allows control of a {@link ReadableStream | readable stream}'s state and internal queue.
+     *
+     * @public
+     */
+    class ReadableStreamDefaultController {
+        constructor() {
+            throw new TypeError('Illegal constructor');
+        }
+        /**
+         * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is
+         * over-full. An underlying source ought to use this information to determine when and how to apply backpressure.
+         */
+        get desiredSize() {
+            if (!IsReadableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$1('desiredSize');
+            }
+            return ReadableStreamDefaultControllerGetDesiredSize(this);
+        }
+        /**
+         * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from
+         * the stream, but once those are read, the stream will become closed.
+         */
+        close() {
+            if (!IsReadableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$1('close');
+            }
+            if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {
+                throw new TypeError('The stream is not in a state that permits close');
+            }
+            ReadableStreamDefaultControllerClose(this);
+        }
+        enqueue(chunk = undefined) {
+            if (!IsReadableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$1('enqueue');
+            }
+            if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {
+                throw new TypeError('The stream is not in a state that permits enqueue');
+            }
+            return ReadableStreamDefaultControllerEnqueue(this, chunk);
+        }
+        /**
+         * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.
+         */
+        error(e = undefined) {
+            if (!IsReadableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$1('error');
+            }
+            ReadableStreamDefaultControllerError(this, e);
+        }
+        /** @internal */
+        [CancelSteps](reason) {
+            ResetQueue(this);
+            const result = this._cancelAlgorithm(reason);
+            ReadableStreamDefaultControllerClearAlgorithms(this);
+            return result;
+        }
+        /** @internal */
+        [PullSteps](readRequest) {
+            const stream = this._controlledReadableStream;
+            if (this._queue.length > 0) {
+                const chunk = DequeueValue(this);
+                if (this._closeRequested && this._queue.length === 0) {
+                    ReadableStreamDefaultControllerClearAlgorithms(this);
+                    ReadableStreamClose(stream);
+                }
+                else {
+                    ReadableStreamDefaultControllerCallPullIfNeeded(this);
+                }
+                readRequest._chunkSteps(chunk);
+            }
+            else {
+                ReadableStreamAddReadRequest(stream, readRequest);
+                ReadableStreamDefaultControllerCallPullIfNeeded(this);
+            }
+        }
+    }
+    Object.defineProperties(ReadableStreamDefaultController.prototype, {
+        close: { enumerable: true },
+        enqueue: { enumerable: true },
+        error: { enumerable: true },
+        desiredSize: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableStreamDefaultController',
+            configurable: true
+        });
+    }
+    // Abstract operations for the ReadableStreamDefaultController.
+    function IsReadableStreamDefaultController(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableStream')) {
+            return false;
+        }
+        return x instanceof ReadableStreamDefaultController;
+    }
+    function ReadableStreamDefaultControllerCallPullIfNeeded(controller) {
+        const shouldPull = ReadableStreamDefaultControllerShouldCallPull(controller);
+        if (!shouldPull) {
+            return;
+        }
+        if (controller._pulling) {
+            controller._pullAgain = true;
+            return;
+        }
+        controller._pulling = true;
+        const pullPromise = controller._pullAlgorithm();
+        uponPromise(pullPromise, () => {
+            controller._pulling = false;
+            if (controller._pullAgain) {
+                controller._pullAgain = false;
+                ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+            }
+        }, e => {
+            ReadableStreamDefaultControllerError(controller, e);
+        });
+    }
+    function ReadableStreamDefaultControllerShouldCallPull(controller) {
+        const stream = controller._controlledReadableStream;
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+            return false;
+        }
+        if (!controller._started) {
+            return false;
+        }
+        if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+            return true;
+        }
+        const desiredSize = ReadableStreamDefaultControllerGetDesiredSize(controller);
+        if (desiredSize > 0) {
+            return true;
+        }
+        return false;
+    }
+    function ReadableStreamDefaultControllerClearAlgorithms(controller) {
+        controller._pullAlgorithm = undefined;
+        controller._cancelAlgorithm = undefined;
+        controller._strategySizeAlgorithm = undefined;
+    }
+    // A client of ReadableStreamDefaultController may use these functions directly to bypass state check.
+    function ReadableStreamDefaultControllerClose(controller) {
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+            return;
+        }
+        const stream = controller._controlledReadableStream;
+        controller._closeRequested = true;
+        if (controller._queue.length === 0) {
+            ReadableStreamDefaultControllerClearAlgorithms(controller);
+            ReadableStreamClose(stream);
+        }
+    }
+    function ReadableStreamDefaultControllerEnqueue(controller, chunk) {
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+            return;
+        }
+        const stream = controller._controlledReadableStream;
+        if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+            ReadableStreamFulfillReadRequest(stream, chunk, false);
+        }
+        else {
+            let chunkSize;
+            try {
+                chunkSize = controller._strategySizeAlgorithm(chunk);
+            }
+            catch (chunkSizeE) {
+                ReadableStreamDefaultControllerError(controller, chunkSizeE);
+                throw chunkSizeE;
+            }
+            try {
+                EnqueueValueWithSize(controller, chunk, chunkSize);
+            }
+            catch (enqueueE) {
+                ReadableStreamDefaultControllerError(controller, enqueueE);
+                throw enqueueE;
+            }
+        }
+        ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+    }
+    function ReadableStreamDefaultControllerError(controller, e) {
+        const stream = controller._controlledReadableStream;
+        if (stream._state !== 'readable') {
+            return;
+        }
+        ResetQueue(controller);
+        ReadableStreamDefaultControllerClearAlgorithms(controller);
+        ReadableStreamError(stream, e);
+    }
+    function ReadableStreamDefaultControllerGetDesiredSize(controller) {
+        const state = controller._controlledReadableStream._state;
+        if (state === 'errored') {
+            return null;
+        }
+        if (state === 'closed') {
+            return 0;
+        }
+        return controller._strategyHWM - controller._queueTotalSize;
+    }
+    // This is used in the implementation of TransformStream.
+    function ReadableStreamDefaultControllerHasBackpressure(controller) {
+        if (ReadableStreamDefaultControllerShouldCallPull(controller)) {
+            return false;
+        }
+        return true;
+    }
+    function ReadableStreamDefaultControllerCanCloseOrEnqueue(controller) {
+        const state = controller._controlledReadableStream._state;
+        if (!controller._closeRequested && state === 'readable') {
+            return true;
+        }
+        return false;
+    }
+    function SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm) {
+        controller._controlledReadableStream = stream;
+        controller._queue = undefined;
+        controller._queueTotalSize = undefined;
+        ResetQueue(controller);
+        controller._started = false;
+        controller._closeRequested = false;
+        controller._pullAgain = false;
+        controller._pulling = false;
+        controller._strategySizeAlgorithm = sizeAlgorithm;
+        controller._strategyHWM = highWaterMark;
+        controller._pullAlgorithm = pullAlgorithm;
+        controller._cancelAlgorithm = cancelAlgorithm;
+        stream._readableStreamController = controller;
+        const startResult = startAlgorithm();
+        uponPromise(promiseResolvedWith(startResult), () => {
+            controller._started = true;
+            ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+        }, r => {
+            ReadableStreamDefaultControllerError(controller, r);
+        });
+    }
+    function SetUpReadableStreamDefaultControllerFromUnderlyingSource(stream, underlyingSource, highWaterMark, sizeAlgorithm) {
+        const controller = Object.create(ReadableStreamDefaultController.prototype);
+        let startAlgorithm = () => undefined;
+        let pullAlgorithm = () => promiseResolvedWith(undefined);
+        let cancelAlgorithm = () => promiseResolvedWith(undefined);
+        if (underlyingSource.start !== undefined) {
+            startAlgorithm = () => underlyingSource.start(controller);
+        }
+        if (underlyingSource.pull !== undefined) {
+            pullAlgorithm = () => underlyingSource.pull(controller);
+        }
+        if (underlyingSource.cancel !== undefined) {
+            cancelAlgorithm = reason => underlyingSource.cancel(reason);
+        }
+        SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm);
+    }
+    // Helper functions for the ReadableStreamDefaultController.
+    function defaultControllerBrandCheckException$1(name) {
+        return new TypeError(`ReadableStreamDefaultController.prototype.${name} can only be used on a ReadableStreamDefaultController`);
+    }
+
+    function ReadableStreamTee(stream, cloneForBranch2) {
+        if (IsReadableByteStreamController(stream._readableStreamController)) {
+            return ReadableByteStreamTee(stream);
+        }
+        return ReadableStreamDefaultTee(stream);
+    }
+    function ReadableStreamDefaultTee(stream, cloneForBranch2) {
+        const reader = AcquireReadableStreamDefaultReader(stream);
+        let reading = false;
+        let readAgain = false;
+        let canceled1 = false;
+        let canceled2 = false;
+        let reason1;
+        let reason2;
+        let branch1;
+        let branch2;
+        let resolveCancelPromise;
+        const cancelPromise = newPromise(resolve => {
+            resolveCancelPromise = resolve;
+        });
+        function pullAlgorithm() {
+            if (reading) {
+                readAgain = true;
+                return promiseResolvedWith(undefined);
+            }
+            reading = true;
+            const readRequest = {
+                _chunkSteps: chunk => {
+                    // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                    // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                    // successful synchronously-available reads get ahead of asynchronously-available errors.
+                    queueMicrotask(() => {
+                        readAgain = false;
+                        const chunk1 = chunk;
+                        const chunk2 = chunk;
+                        // There is no way to access the cloning code right now in the reference implementation.
+                        // If we add one then we'll need an implementation for serializable objects.
+                        // if (!canceled2 && cloneForBranch2) {
+                        //   chunk2 = StructuredDeserialize(StructuredSerialize(chunk2));
+                        // }
+                        if (!canceled1) {
+                            ReadableStreamDefaultControllerEnqueue(branch1._readableStreamController, chunk1);
+                        }
+                        if (!canceled2) {
+                            ReadableStreamDefaultControllerEnqueue(branch2._readableStreamController, chunk2);
+                        }
+                        reading = false;
+                        if (readAgain) {
+                            pullAlgorithm();
+                        }
+                    });
+                },
+                _closeSteps: () => {
+                    reading = false;
+                    if (!canceled1) {
+                        ReadableStreamDefaultControllerClose(branch1._readableStreamController);
+                    }
+                    if (!canceled2) {
+                        ReadableStreamDefaultControllerClose(branch2._readableStreamController);
+                    }
+                    if (!canceled1 || !canceled2) {
+                        resolveCancelPromise(undefined);
+                    }
+                },
+                _errorSteps: () => {
+                    reading = false;
+                }
+            };
+            ReadableStreamDefaultReaderRead(reader, readRequest);
+            return promiseResolvedWith(undefined);
+        }
+        function cancel1Algorithm(reason) {
+            canceled1 = true;
+            reason1 = reason;
+            if (canceled2) {
+                const compositeReason = CreateArrayFromList([reason1, reason2]);
+                const cancelResult = ReadableStreamCancel(stream, compositeReason);
+                resolveCancelPromise(cancelResult);
+            }
+            return cancelPromise;
+        }
+        function cancel2Algorithm(reason) {
+            canceled2 = true;
+            reason2 = reason;
+            if (canceled1) {
+                const compositeReason = CreateArrayFromList([reason1, reason2]);
+                const cancelResult = ReadableStreamCancel(stream, compositeReason);
+                resolveCancelPromise(cancelResult);
+            }
+            return cancelPromise;
+        }
+        function startAlgorithm() {
+            // do nothing
+        }
+        branch1 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel1Algorithm);
+        branch2 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel2Algorithm);
+        uponRejection(reader._closedPromise, (r) => {
+            ReadableStreamDefaultControllerError(branch1._readableStreamController, r);
+            ReadableStreamDefaultControllerError(branch2._readableStreamController, r);
+            if (!canceled1 || !canceled2) {
+                resolveCancelPromise(undefined);
+            }
+        });
+        return [branch1, branch2];
+    }
+    function ReadableByteStreamTee(stream) {
+        let reader = AcquireReadableStreamDefaultReader(stream);
+        let reading = false;
+        let readAgainForBranch1 = false;
+        let readAgainForBranch2 = false;
+        let canceled1 = false;
+        let canceled2 = false;
+        let reason1;
+        let reason2;
+        let branch1;
+        let branch2;
+        let resolveCancelPromise;
+        const cancelPromise = newPromise(resolve => {
+            resolveCancelPromise = resolve;
+        });
+        function forwardReaderError(thisReader) {
+            uponRejection(thisReader._closedPromise, r => {
+                if (thisReader !== reader) {
+                    return;
+                }
+                ReadableByteStreamControllerError(branch1._readableStreamController, r);
+                ReadableByteStreamControllerError(branch2._readableStreamController, r);
+                if (!canceled1 || !canceled2) {
+                    resolveCancelPromise(undefined);
+                }
+            });
+        }
+        function pullWithDefaultReader() {
+            if (IsReadableStreamBYOBReader(reader)) {
+                ReadableStreamReaderGenericRelease(reader);
+                reader = AcquireReadableStreamDefaultReader(stream);
+                forwardReaderError(reader);
+            }
+            const readRequest = {
+                _chunkSteps: chunk => {
+                    // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                    // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                    // successful synchronously-available reads get ahead of asynchronously-available errors.
+                    queueMicrotask(() => {
+                        readAgainForBranch1 = false;
+                        readAgainForBranch2 = false;
+                        const chunk1 = chunk;
+                        let chunk2 = chunk;
+                        if (!canceled1 && !canceled2) {
+                            try {
+                                chunk2 = CloneAsUint8Array(chunk);
+                            }
+                            catch (cloneE) {
+                                ReadableByteStreamControllerError(branch1._readableStreamController, cloneE);
+                                ReadableByteStreamControllerError(branch2._readableStreamController, cloneE);
+                                resolveCancelPromise(ReadableStreamCancel(stream, cloneE));
+                                return;
+                            }
+                        }
+                        if (!canceled1) {
+                            ReadableByteStreamControllerEnqueue(branch1._readableStreamController, chunk1);
+                        }
+                        if (!canceled2) {
+                            ReadableByteStreamControllerEnqueue(branch2._readableStreamController, chunk2);
+                        }
+                        reading = false;
+                        if (readAgainForBranch1) {
+                            pull1Algorithm();
+                        }
+                        else if (readAgainForBranch2) {
+                            pull2Algorithm();
+                        }
+                    });
+                },
+                _closeSteps: () => {
+                    reading = false;
+                    if (!canceled1) {
+                        ReadableByteStreamControllerClose(branch1._readableStreamController);
+                    }
+                    if (!canceled2) {
+                        ReadableByteStreamControllerClose(branch2._readableStreamController);
+                    }
+                    if (branch1._readableStreamController._pendingPullIntos.length > 0) {
+                        ReadableByteStreamControllerRespond(branch1._readableStreamController, 0);
+                    }
+                    if (branch2._readableStreamController._pendingPullIntos.length > 0) {
+                        ReadableByteStreamControllerRespond(branch2._readableStreamController, 0);
+                    }
+                    if (!canceled1 || !canceled2) {
+                        resolveCancelPromise(undefined);
+                    }
+                },
+                _errorSteps: () => {
+                    reading = false;
+                }
+            };
+            ReadableStreamDefaultReaderRead(reader, readRequest);
+        }
+        function pullWithBYOBReader(view, forBranch2) {
+            if (IsReadableStreamDefaultReader(reader)) {
+                ReadableStreamReaderGenericRelease(reader);
+                reader = AcquireReadableStreamBYOBReader(stream);
+                forwardReaderError(reader);
+            }
+            const byobBranch = forBranch2 ? branch2 : branch1;
+            const otherBranch = forBranch2 ? branch1 : branch2;
+            const readIntoRequest = {
+                _chunkSteps: chunk => {
+                    // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                    // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                    // successful synchronously-available reads get ahead of asynchronously-available errors.
+                    queueMicrotask(() => {
+                        readAgainForBranch1 = false;
+                        readAgainForBranch2 = false;
+                        const byobCanceled = forBranch2 ? canceled2 : canceled1;
+                        const otherCanceled = forBranch2 ? canceled1 : canceled2;
+                        if (!otherCanceled) {
+                            let clonedChunk;
+                            try {
+                                clonedChunk = CloneAsUint8Array(chunk);
+                            }
+                            catch (cloneE) {
+                                ReadableByteStreamControllerError(byobBranch._readableStreamController, cloneE);
+                                ReadableByteStreamControllerError(otherBranch._readableStreamController, cloneE);
+                                resolveCancelPromise(ReadableStreamCancel(stream, cloneE));
+                                return;
+                            }
+                            if (!byobCanceled) {
+                                ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                            }
+                            ReadableByteStreamControllerEnqueue(otherBranch._readableStreamController, clonedChunk);
+                        }
+                        else if (!byobCanceled) {
+                            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                        }
+                        reading = false;
+                        if (readAgainForBranch1) {
+                            pull1Algorithm();
+                        }
+                        else if (readAgainForBranch2) {
+                            pull2Algorithm();
+                        }
+                    });
+                },
+                _closeSteps: chunk => {
+                    reading = false;
+                    const byobCanceled = forBranch2 ? canceled2 : canceled1;
+                    const otherCanceled = forBranch2 ? canceled1 : canceled2;
+                    if (!byobCanceled) {
+                        ReadableByteStreamControllerClose(byobBranch._readableStreamController);
+                    }
+                    if (!otherCanceled) {
+                        ReadableByteStreamControllerClose(otherBranch._readableStreamController);
+                    }
+                    if (chunk !== undefined) {
+                        if (!byobCanceled) {
+                            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                        }
+                        if (!otherCanceled && otherBranch._readableStreamController._pendingPullIntos.length > 0) {
+                            ReadableByteStreamControllerRespond(otherBranch._readableStreamController, 0);
+                        }
+                    }
+                    if (!byobCanceled || !otherCanceled) {
+                        resolveCancelPromise(undefined);
+                    }
+                },
+                _errorSteps: () => {
+                    reading = false;
+                }
+            };
+            ReadableStreamBYOBReaderRead(reader, view, readIntoRequest);
+        }
+        function pull1Algorithm() {
+            if (reading) {
+                readAgainForBranch1 = true;
+                return promiseResolvedWith(undefined);
+            }
+            reading = true;
+            const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch1._readableStreamController);
+            if (byobRequest === null) {
+                pullWithDefaultReader();
+            }
+            else {
+                pullWithBYOBReader(byobRequest._view, false);
+            }
+            return promiseResolvedWith(undefined);
+        }
+        function pull2Algorithm() {
+            if (reading) {
+                readAgainForBranch2 = true;
+                return promiseResolvedWith(undefined);
+            }
+            reading = true;
+            const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch2._readableStreamController);
+            if (byobRequest === null) {
+                pullWithDefaultReader();
+            }
+            else {
+                pullWithBYOBReader(byobRequest._view, true);
+            }
+            return promiseResolvedWith(undefined);
+        }
+        function cancel1Algorithm(reason) {
+            canceled1 = true;
+            reason1 = reason;
+            if (canceled2) {
+                const compositeReason = CreateArrayFromList([reason1, reason2]);
+                const cancelResult = ReadableStreamCancel(stream, compositeReason);
+                resolveCancelPromise(cancelResult);
+            }
+            return cancelPromise;
+        }
+        function cancel2Algorithm(reason) {
+            canceled2 = true;
+            reason2 = reason;
+            if (canceled1) {
+                const compositeReason = CreateArrayFromList([reason1, reason2]);
+                const cancelResult = ReadableStreamCancel(stream, compositeReason);
+                resolveCancelPromise(cancelResult);
+            }
+            return cancelPromise;
+        }
+        function startAlgorithm() {
+            return;
+        }
+        branch1 = CreateReadableByteStream(startAlgorithm, pull1Algorithm, cancel1Algorithm);
+        branch2 = CreateReadableByteStream(startAlgorithm, pull2Algorithm, cancel2Algorithm);
+        forwardReaderError(reader);
+        return [branch1, branch2];
+    }
+
+    function convertUnderlyingDefaultOrByteSource(source, context) {
+        assertDictionary(source, context);
+        const original = source;
+        const autoAllocateChunkSize = original === null || original === void 0 ? void 0 : original.autoAllocateChunkSize;
+        const cancel = original === null || original === void 0 ? void 0 : original.cancel;
+        const pull = original === null || original === void 0 ? void 0 : original.pull;
+        const start = original === null || original === void 0 ? void 0 : original.start;
+        const type = original === null || original === void 0 ? void 0 : original.type;
+        return {
+            autoAllocateChunkSize: autoAllocateChunkSize === undefined ?
+                undefined :
+                convertUnsignedLongLongWithEnforceRange(autoAllocateChunkSize, `${context} has member 'autoAllocateChunkSize' that`),
+            cancel: cancel === undefined ?
+                undefined :
+                convertUnderlyingSourceCancelCallback(cancel, original, `${context} has member 'cancel' that`),
+            pull: pull === undefined ?
+                undefined :
+                convertUnderlyingSourcePullCallback(pull, original, `${context} has member 'pull' that`),
+            start: start === undefined ?
+                undefined :
+                convertUnderlyingSourceStartCallback(start, original, `${context} has member 'start' that`),
+            type: type === undefined ? undefined : convertReadableStreamType(type, `${context} has member 'type' that`)
+        };
+    }
+    function convertUnderlyingSourceCancelCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (reason) => promiseCall(fn, original, [reason]);
+    }
+    function convertUnderlyingSourcePullCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (controller) => promiseCall(fn, original, [controller]);
+    }
+    function convertUnderlyingSourceStartCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (controller) => reflectCall(fn, original, [controller]);
+    }
+    function convertReadableStreamType(type, context) {
+        type = `${type}`;
+        if (type !== 'bytes') {
+            throw new TypeError(`${context} '${type}' is not a valid enumeration value for ReadableStreamType`);
+        }
+        return type;
+    }
+
+    function convertReaderOptions(options, context) {
+        assertDictionary(options, context);
+        const mode = options === null || options === void 0 ? void 0 : options.mode;
+        return {
+            mode: mode === undefined ? undefined : convertReadableStreamReaderMode(mode, `${context} has member 'mode' that`)
+        };
+    }
+    function convertReadableStreamReaderMode(mode, context) {
+        mode = `${mode}`;
+        if (mode !== 'byob') {
+            throw new TypeError(`${context} '${mode}' is not a valid enumeration value for ReadableStreamReaderMode`);
+        }
+        return mode;
+    }
+
+    function convertIteratorOptions(options, context) {
+        assertDictionary(options, context);
+        const preventCancel = options === null || options === void 0 ? void 0 : options.preventCancel;
+        return { preventCancel: Boolean(preventCancel) };
+    }
+
+    function convertPipeOptions(options, context) {
+        assertDictionary(options, context);
+        const preventAbort = options === null || options === void 0 ? void 0 : options.preventAbort;
+        const preventCancel = options === null || options === void 0 ? void 0 : options.preventCancel;
+        const preventClose = options === null || options === void 0 ? void 0 : options.preventClose;
+        const signal = options === null || options === void 0 ? void 0 : options.signal;
+        if (signal !== undefined) {
+            assertAbortSignal(signal, `${context} has member 'signal' that`);
+        }
+        return {
+            preventAbort: Boolean(preventAbort),
+            preventCancel: Boolean(preventCancel),
+            preventClose: Boolean(preventClose),
+            signal
+        };
+    }
+    function assertAbortSignal(signal, context) {
+        if (!isAbortSignal(signal)) {
+            throw new TypeError(`${context} is not an AbortSignal.`);
+        }
+    }
+
+    function convertReadableWritablePair(pair, context) {
+        assertDictionary(pair, context);
+        const readable = pair === null || pair === void 0 ? void 0 : pair.readable;
+        assertRequiredField(readable, 'readable', 'ReadableWritablePair');
+        assertReadableStream(readable, `${context} has member 'readable' that`);
+        const writable = pair === null || pair === void 0 ? void 0 : pair.writable;
+        assertRequiredField(writable, 'writable', 'ReadableWritablePair');
+        assertWritableStream(writable, `${context} has member 'writable' that`);
+        return { readable, writable };
+    }
+
+    /**
+     * A readable stream represents a source of data, from which you can read.
+     *
+     * @public
+     */
+    class ReadableStream {
+        constructor(rawUnderlyingSource = {}, rawStrategy = {}) {
+            if (rawUnderlyingSource === undefined) {
+                rawUnderlyingSource = null;
+            }
+            else {
+                assertObject(rawUnderlyingSource, 'First parameter');
+            }
+            const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');
+            const underlyingSource = convertUnderlyingDefaultOrByteSource(rawUnderlyingSource, 'First parameter');
+            InitializeReadableStream(this);
+            if (underlyingSource.type === 'bytes') {
+                if (strategy.size !== undefined) {
+                    throw new RangeError('The strategy for a byte stream cannot have a size function');
+                }
+                const highWaterMark = ExtractHighWaterMark(strategy, 0);
+                SetUpReadableByteStreamControllerFromUnderlyingSource(this, underlyingSource, highWaterMark);
+            }
+            else {
+                const sizeAlgorithm = ExtractSizeAlgorithm(strategy);
+                const highWaterMark = ExtractHighWaterMark(strategy, 1);
+                SetUpReadableStreamDefaultControllerFromUnderlyingSource(this, underlyingSource, highWaterMark, sizeAlgorithm);
+            }
+        }
+        /**
+         * Whether or not the readable stream is locked to a {@link ReadableStreamDefaultReader | reader}.
+         */
+        get locked() {
+            if (!IsReadableStream(this)) {
+                throw streamBrandCheckException$1('locked');
+            }
+            return IsReadableStreamLocked(this);
+        }
+        /**
+         * Cancels the stream, signaling a loss of interest in the stream by a consumer.
+         *
+         * The supplied `reason` argument will be given to the underlying source's {@link UnderlyingSource.cancel | cancel()}
+         * method, which might or might not use it.
+         */
+        cancel(reason = undefined) {
+            if (!IsReadableStream(this)) {
+                return promiseRejectedWith(streamBrandCheckException$1('cancel'));
+            }
+            if (IsReadableStreamLocked(this)) {
+                return promiseRejectedWith(new TypeError('Cannot cancel a stream that already has a reader'));
+            }
+            return ReadableStreamCancel(this, reason);
+        }
+        getReader(rawOptions = undefined) {
+            if (!IsReadableStream(this)) {
+                throw streamBrandCheckException$1('getReader');
+            }
+            const options = convertReaderOptions(rawOptions, 'First parameter');
+            if (options.mode === undefined) {
+                return AcquireReadableStreamDefaultReader(this);
+            }
+            return AcquireReadableStreamBYOBReader(this);
+        }
+        pipeThrough(rawTransform, rawOptions = {}) {
+            if (!IsReadableStream(this)) {
+                throw streamBrandCheckException$1('pipeThrough');
+            }
+            assertRequiredArgument(rawTransform, 1, 'pipeThrough');
+            const transform = convertReadableWritablePair(rawTransform, 'First parameter');
+            const options = convertPipeOptions(rawOptions, 'Second parameter');
+            if (IsReadableStreamLocked(this)) {
+                throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked ReadableStream');
+            }
+            if (IsWritableStreamLocked(transform.writable)) {
+                throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked WritableStream');
+            }
+            const promise = ReadableStreamPipeTo(this, transform.writable, options.preventClose, options.preventAbort, options.preventCancel, options.signal);
+            setPromiseIsHandledToTrue(promise);
+            return transform.readable;
+        }
+        pipeTo(destination, rawOptions = {}) {
+            if (!IsReadableStream(this)) {
+                return promiseRejectedWith(streamBrandCheckException$1('pipeTo'));
+            }
+            if (destination === undefined) {
+                return promiseRejectedWith(`Parameter 1 is required in 'pipeTo'.`);
+            }
+            if (!IsWritableStream(destination)) {
+                return promiseRejectedWith(new TypeError(`ReadableStream.prototype.pipeTo's first argument must be a WritableStream`));
+            }
+            let options;
+            try {
+                options = convertPipeOptions(rawOptions, 'Second parameter');
+            }
+            catch (e) {
+                return promiseRejectedWith(e);
+            }
+            if (IsReadableStreamLocked(this)) {
+                return promiseRejectedWith(new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream'));
+            }
+            if (IsWritableStreamLocked(destination)) {
+                return promiseRejectedWith(new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream'));
+            }
+            return ReadableStreamPipeTo(this, destination, options.preventClose, options.preventAbort, options.preventCancel, options.signal);
+        }
+        /**
+         * Tees this readable stream, returning a two-element array containing the two resulting branches as
+         * new {@link ReadableStream} instances.
+         *
+         * Teeing a stream will lock it, preventing any other consumer from acquiring a reader.
+         * To cancel the stream, cancel both of the resulting branches; a composite cancellation reason will then be
+         * propagated to the stream's underlying source.
+         *
+         * Note that the chunks seen in each branch will be the same object. If the chunks are not immutable,
+         * this could allow interference between the two branches.
+         */
+        tee() {
+            if (!IsReadableStream(this)) {
+                throw streamBrandCheckException$1('tee');
+            }
+            const branches = ReadableStreamTee(this);
+            return CreateArrayFromList(branches);
+        }
+        values(rawOptions = undefined) {
+            if (!IsReadableStream(this)) {
+                throw streamBrandCheckException$1('values');
+            }
+            const options = convertIteratorOptions(rawOptions, 'First parameter');
+            return AcquireReadableStreamAsyncIterator(this, options.preventCancel);
+        }
+    }
+    Object.defineProperties(ReadableStream.prototype, {
+        cancel: { enumerable: true },
+        getReader: { enumerable: true },
+        pipeThrough: { enumerable: true },
+        pipeTo: { enumerable: true },
+        tee: { enumerable: true },
+        values: { enumerable: true },
+        locked: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableStream.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableStream',
+            configurable: true
+        });
+    }
+    if (typeof SymbolPolyfill.asyncIterator === 'symbol') {
+        Object.defineProperty(ReadableStream.prototype, SymbolPolyfill.asyncIterator, {
+            value: ReadableStream.prototype.values,
+            writable: true,
+            configurable: true
+        });
+    }
+    // Abstract operations for the ReadableStream.
+    // Throws if and only if startAlgorithm throws.
+    function CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark = 1, sizeAlgorithm = () => 1) {
+        const stream = Object.create(ReadableStream.prototype);
+        InitializeReadableStream(stream);
+        const controller = Object.create(ReadableStreamDefaultController.prototype);
+        SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm);
+        return stream;
+    }
+    // Throws if and only if startAlgorithm throws.
+    function CreateReadableByteStream(startAlgorithm, pullAlgorithm, cancelAlgorithm) {
+        const stream = Object.create(ReadableStream.prototype);
+        InitializeReadableStream(stream);
+        const controller = Object.create(ReadableByteStreamController.prototype);
+        SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, 0, undefined);
+        return stream;
+    }
+    function InitializeReadableStream(stream) {
+        stream._state = 'readable';
+        stream._reader = undefined;
+        stream._storedError = undefined;
+        stream._disturbed = false;
+    }
+    function IsReadableStream(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_readableStreamController')) {
+            return false;
+        }
+        return x instanceof ReadableStream;
+    }
+    function IsReadableStreamLocked(stream) {
+        if (stream._reader === undefined) {
+            return false;
+        }
+        return true;
+    }
+    // ReadableStream API exposed for controllers.
+    function ReadableStreamCancel(stream, reason) {
+        stream._disturbed = true;
+        if (stream._state === 'closed') {
+            return promiseResolvedWith(undefined);
+        }
+        if (stream._state === 'errored') {
+            return promiseRejectedWith(stream._storedError);
+        }
+        ReadableStreamClose(stream);
+        const reader = stream._reader;
+        if (reader !== undefined && IsReadableStreamBYOBReader(reader)) {
+            reader._readIntoRequests.forEach(readIntoRequest => {
+                readIntoRequest._closeSteps(undefined);
+            });
+            reader._readIntoRequests = new SimpleQueue();
+        }
+        const sourceCancelPromise = stream._readableStreamController[CancelSteps](reason);
+        return transformPromiseWith(sourceCancelPromise, noop);
+    }
+    function ReadableStreamClose(stream) {
+        stream._state = 'closed';
+        const reader = stream._reader;
+        if (reader === undefined) {
+            return;
+        }
+        defaultReaderClosedPromiseResolve(reader);
+        if (IsReadableStreamDefaultReader(reader)) {
+            reader._readRequests.forEach(readRequest => {
+                readRequest._closeSteps();
+            });
+            reader._readRequests = new SimpleQueue();
+        }
+    }
+    function ReadableStreamError(stream, e) {
+        stream._state = 'errored';
+        stream._storedError = e;
+        const reader = stream._reader;
+        if (reader === undefined) {
+            return;
+        }
+        defaultReaderClosedPromiseReject(reader, e);
+        if (IsReadableStreamDefaultReader(reader)) {
+            reader._readRequests.forEach(readRequest => {
+                readRequest._errorSteps(e);
+            });
+            reader._readRequests = new SimpleQueue();
+        }
+        else {
+            reader._readIntoRequests.forEach(readIntoRequest => {
+                readIntoRequest._errorSteps(e);
+            });
+            reader._readIntoRequests = new SimpleQueue();
+        }
+    }
+    // Helper functions for the ReadableStream.
+    function streamBrandCheckException$1(name) {
+        return new TypeError(`ReadableStream.prototype.${name} can only be used on a ReadableStream`);
+    }
+
+    function convertQueuingStrategyInit(init, context) {
+        assertDictionary(init, context);
+        const highWaterMark = init === null || init === void 0 ? void 0 : init.highWaterMark;
+        assertRequiredField(highWaterMark, 'highWaterMark', 'QueuingStrategyInit');
+        return {
+            highWaterMark: convertUnrestrictedDouble(highWaterMark)
+        };
+    }
+
+    // The size function must not have a prototype property nor be a constructor
+    const byteLengthSizeFunction = (chunk) => {
+        return chunk.byteLength;
+    };
+    try {
+        Object.defineProperty(byteLengthSizeFunction, 'name', {
+            value: 'size',
+            configurable: true
+        });
+    }
+    catch (_a) {
+        // This property is non-configurable in older browsers, so ignore if this throws.
+        // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility
+    }
+    /**
+     * A queuing strategy that counts the number of bytes in each chunk.
+     *
+     * @public
+     */
+    class ByteLengthQueuingStrategy {
+        constructor(options) {
+            assertRequiredArgument(options, 1, 'ByteLengthQueuingStrategy');
+            options = convertQueuingStrategyInit(options, 'First parameter');
+            this._byteLengthQueuingStrategyHighWaterMark = options.highWaterMark;
+        }
+        /**
+         * Returns the high water mark provided to the constructor.
+         */
+        get highWaterMark() {
+            if (!IsByteLengthQueuingStrategy(this)) {
+                throw byteLengthBrandCheckException('highWaterMark');
+            }
+            return this._byteLengthQueuingStrategyHighWaterMark;
+        }
+        /**
+         * Measures the size of `chunk` by returning the value of its `byteLength` property.
+         */
+        get size() {
+            if (!IsByteLengthQueuingStrategy(this)) {
+                throw byteLengthBrandCheckException('size');
+            }
+            return byteLengthSizeFunction;
+        }
+    }
+    Object.defineProperties(ByteLengthQueuingStrategy.prototype, {
+        highWaterMark: { enumerable: true },
+        size: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ByteLengthQueuingStrategy.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ByteLengthQueuingStrategy',
+            configurable: true
+        });
+    }
+    // Helper functions for the ByteLengthQueuingStrategy.
+    function byteLengthBrandCheckException(name) {
+        return new TypeError(`ByteLengthQueuingStrategy.prototype.${name} can only be used on a ByteLengthQueuingStrategy`);
+    }
+    function IsByteLengthQueuingStrategy(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_byteLengthQueuingStrategyHighWaterMark')) {
+            return false;
+        }
+        return x instanceof ByteLengthQueuingStrategy;
+    }
+
+    // The size function must not have a prototype property nor be a constructor
+    const countSizeFunction = () => {
+        return 1;
+    };
+    try {
+        Object.defineProperty(countSizeFunction, 'name', {
+            value: 'size',
+            configurable: true
+        });
+    }
+    catch (_a) {
+        // This property is non-configurable in older browsers, so ignore if this throws.
+        // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility
+    }
+    /**
+     * A queuing strategy that counts the number of chunks.
+     *
+     * @public
+     */
+    class CountQueuingStrategy {
+        constructor(options) {
+            assertRequiredArgument(options, 1, 'CountQueuingStrategy');
+            options = convertQueuingStrategyInit(options, 'First parameter');
+            this._countQueuingStrategyHighWaterMark = options.highWaterMark;
+        }
+        /**
+         * Returns the high water mark provided to the constructor.
+         */
+        get highWaterMark() {
+            if (!IsCountQueuingStrategy(this)) {
+                throw countBrandCheckException('highWaterMark');
+            }
+            return this._countQueuingStrategyHighWaterMark;
+        }
+        /**
+         * Measures the size of `chunk` by always returning 1.
+         * This ensures that the total queue size is a count of the number of chunks in the queue.
+         */
+        get size() {
+            if (!IsCountQueuingStrategy(this)) {
+                throw countBrandCheckException('size');
+            }
+            return countSizeFunction;
+        }
+    }
+    Object.defineProperties(CountQueuingStrategy.prototype, {
+        highWaterMark: { enumerable: true },
+        size: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(CountQueuingStrategy.prototype, SymbolPolyfill.toStringTag, {
+            value: 'CountQueuingStrategy',
+            configurable: true
+        });
+    }
+    // Helper functions for the CountQueuingStrategy.
+    function countBrandCheckException(name) {
+        return new TypeError(`CountQueuingStrategy.prototype.${name} can only be used on a CountQueuingStrategy`);
+    }
+    function IsCountQueuingStrategy(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_countQueuingStrategyHighWaterMark')) {
+            return false;
+        }
+        return x instanceof CountQueuingStrategy;
+    }
+
+    function convertTransformer(original, context) {
+        assertDictionary(original, context);
+        const flush = original === null || original === void 0 ? void 0 : original.flush;
+        const readableType = original === null || original === void 0 ? void 0 : original.readableType;
+        const start = original === null || original === void 0 ? void 0 : original.start;
+        const transform = original === null || original === void 0 ? void 0 : original.transform;
+        const writableType = original === null || original === void 0 ? void 0 : original.writableType;
+        return {
+            flush: flush === undefined ?
+                undefined :
+                convertTransformerFlushCallback(flush, original, `${context} has member 'flush' that`),
+            readableType,
+            start: start === undefined ?
+                undefined :
+                convertTransformerStartCallback(start, original, `${context} has member 'start' that`),
+            transform: transform === undefined ?
+                undefined :
+                convertTransformerTransformCallback(transform, original, `${context} has member 'transform' that`),
+            writableType
+        };
+    }
+    function convertTransformerFlushCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (controller) => promiseCall(fn, original, [controller]);
+    }
+    function convertTransformerStartCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (controller) => reflectCall(fn, original, [controller]);
+    }
+    function convertTransformerTransformCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (chunk, controller) => promiseCall(fn, original, [chunk, controller]);
+    }
+
+    // Class TransformStream
+    /**
+     * A transform stream consists of a pair of streams: a {@link WritableStream | writable stream},
+     * known as its writable side, and a {@link ReadableStream | readable stream}, known as its readable side.
+     * In a manner specific to the transform stream in question, writes to the writable side result in new data being
+     * made available for reading from the readable side.
+     *
+     * @public
+     */
+    class TransformStream {
+        constructor(rawTransformer = {}, rawWritableStrategy = {}, rawReadableStrategy = {}) {
+            if (rawTransformer === undefined) {
+                rawTransformer = null;
+            }
+            const writableStrategy = convertQueuingStrategy(rawWritableStrategy, 'Second parameter');
+            const readableStrategy = convertQueuingStrategy(rawReadableStrategy, 'Third parameter');
+            const transformer = convertTransformer(rawTransformer, 'First parameter');
+            if (transformer.readableType !== undefined) {
+                throw new RangeError('Invalid readableType specified');
+            }
+            if (transformer.writableType !== undefined) {
+                throw new RangeError('Invalid writableType specified');
+            }
+            const readableHighWaterMark = ExtractHighWaterMark(readableStrategy, 0);
+            const readableSizeAlgorithm = ExtractSizeAlgorithm(readableStrategy);
+            const writableHighWaterMark = ExtractHighWaterMark(writableStrategy, 1);
+            const writableSizeAlgorithm = ExtractSizeAlgorithm(writableStrategy);
+            let startPromise_resolve;
+            const startPromise = newPromise(resolve => {
+                startPromise_resolve = resolve;
+            });
+            InitializeTransformStream(this, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm);
+            SetUpTransformStreamDefaultControllerFromTransformer(this, transformer);
+            if (transformer.start !== undefined) {
+                startPromise_resolve(transformer.start(this._transformStreamController));
+            }
+            else {
+                startPromise_resolve(undefined);
+            }
+        }
+        /**
+         * The readable side of the transform stream.
+         */
+        get readable() {
+            if (!IsTransformStream(this)) {
+                throw streamBrandCheckException('readable');
+            }
+            return this._readable;
+        }
+        /**
+         * The writable side of the transform stream.
+         */
+        get writable() {
+            if (!IsTransformStream(this)) {
+                throw streamBrandCheckException('writable');
+            }
+            return this._writable;
+        }
+    }
+    Object.defineProperties(TransformStream.prototype, {
+        readable: { enumerable: true },
+        writable: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(TransformStream.prototype, SymbolPolyfill.toStringTag, {
+            value: 'TransformStream',
+            configurable: true
+        });
+    }
+    function InitializeTransformStream(stream, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm) {
+        function startAlgorithm() {
+            return startPromise;
+        }
+        function writeAlgorithm(chunk) {
+            return TransformStreamDefaultSinkWriteAlgorithm(stream, chunk);
+        }
+        function abortAlgorithm(reason) {
+            return TransformStreamDefaultSinkAbortAlgorithm(stream, reason);
+        }
+        function closeAlgorithm() {
+            return TransformStreamDefaultSinkCloseAlgorithm(stream);
+        }
+        stream._writable = CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, writableHighWaterMark, writableSizeAlgorithm);
+        function pullAlgorithm() {
+            return TransformStreamDefaultSourcePullAlgorithm(stream);
+        }
+        function cancelAlgorithm(reason) {
+            TransformStreamErrorWritableAndUnblockWrite(stream, reason);
+            return promiseResolvedWith(undefined);
+        }
+        stream._readable = CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, readableHighWaterMark, readableSizeAlgorithm);
+        // The [[backpressure]] slot is set to undefined so that it can be initialised by TransformStreamSetBackpressure.
+        stream._backpressure = undefined;
+        stream._backpressureChangePromise = undefined;
+        stream._backpressureChangePromise_resolve = undefined;
+        TransformStreamSetBackpressure(stream, true);
+        stream._transformStreamController = undefined;
+    }
+    function IsTransformStream(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_transformStreamController')) {
+            return false;
+        }
+        return x instanceof TransformStream;
+    }
+    // This is a no-op if both sides are already errored.
+    function TransformStreamError(stream, e) {
+        ReadableStreamDefaultControllerError(stream._readable._readableStreamController, e);
+        TransformStreamErrorWritableAndUnblockWrite(stream, e);
+    }
+    function TransformStreamErrorWritableAndUnblockWrite(stream, e) {
+        TransformStreamDefaultControllerClearAlgorithms(stream._transformStreamController);
+        WritableStreamDefaultControllerErrorIfNeeded(stream._writable._writableStreamController, e);
+        if (stream._backpressure) {
+            // Pretend that pull() was called to permit any pending write() calls to complete. TransformStreamSetBackpressure()
+            // cannot be called from enqueue() or pull() once the ReadableStream is errored, so this will will be the final time
+            // _backpressure is set.
+            TransformStreamSetBackpressure(stream, false);
+        }
+    }
+    function TransformStreamSetBackpressure(stream, backpressure) {
+        // Passes also when called during construction.
+        if (stream._backpressureChangePromise !== undefined) {
+            stream._backpressureChangePromise_resolve();
+        }
+        stream._backpressureChangePromise = newPromise(resolve => {
+            stream._backpressureChangePromise_resolve = resolve;
+        });
+        stream._backpressure = backpressure;
+    }
+    // Class TransformStreamDefaultController
+    /**
+     * Allows control of the {@link ReadableStream} and {@link WritableStream} of the associated {@link TransformStream}.
+     *
+     * @public
+     */
+    class TransformStreamDefaultController {
+        constructor() {
+            throw new TypeError('Illegal constructor');
+        }
+        /**
+         * Returns the desired size to fill the readable side’s internal queue. It can be negative, if the queue is over-full.
+         */
+        get desiredSize() {
+            if (!IsTransformStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException('desiredSize');
+            }
+            const readableController = this._controlledTransformStream._readable._readableStreamController;
+            return ReadableStreamDefaultControllerGetDesiredSize(readableController);
+        }
+        enqueue(chunk = undefined) {
+            if (!IsTransformStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException('enqueue');
+            }
+            TransformStreamDefaultControllerEnqueue(this, chunk);
+        }
+        /**
+         * Errors both the readable side and the writable side of the controlled transform stream, making all future
+         * interactions with it fail with the given error `e`. Any chunks queued for transformation will be discarded.
+         */
+        error(reason = undefined) {
+            if (!IsTransformStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException('error');
+            }
+            TransformStreamDefaultControllerError(this, reason);
+        }
+        /**
+         * Closes the readable side and errors the writable side of the controlled transform stream. This is useful when the
+         * transformer only needs to consume a portion of the chunks written to the writable side.
+         */
+        terminate() {
+            if (!IsTransformStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException('terminate');
+            }
+            TransformStreamDefaultControllerTerminate(this);
+        }
+    }
+    Object.defineProperties(TransformStreamDefaultController.prototype, {
+        enqueue: { enumerable: true },
+        error: { enumerable: true },
+        terminate: { enumerable: true },
+        desiredSize: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(TransformStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+            value: 'TransformStreamDefaultController',
+            configurable: true
+        });
+    }
+    // Transform Stream Default Controller Abstract Operations
+    function IsTransformStreamDefaultController(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_controlledTransformStream')) {
+            return false;
+        }
+        return x instanceof TransformStreamDefaultController;
+    }
+    function SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm) {
+        controller._controlledTransformStream = stream;
+        stream._transformStreamController = controller;
+        controller._transformAlgorithm = transformAlgorithm;
+        controller._flushAlgorithm = flushAlgorithm;
+    }
+    function SetUpTransformStreamDefaultControllerFromTransformer(stream, transformer) {
+        const controller = Object.create(TransformStreamDefaultController.prototype);
+        let transformAlgorithm = (chunk) => {
+            try {
+                TransformStreamDefaultControllerEnqueue(controller, chunk);
+                return promiseResolvedWith(undefined);
+            }
+            catch (transformResultE) {
+                return promiseRejectedWith(transformResultE);
+            }
+        };
+        let flushAlgorithm = () => promiseResolvedWith(undefined);
+        if (transformer.transform !== undefined) {
+            transformAlgorithm = chunk => transformer.transform(chunk, controller);
+        }
+        if (transformer.flush !== undefined) {
+            flushAlgorithm = () => transformer.flush(controller);
+        }
+        SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);
+    }
+    function TransformStreamDefaultControllerClearAlgorithms(controller) {
+        controller._transformAlgorithm = undefined;
+        controller._flushAlgorithm = undefined;
+    }
+    function TransformStreamDefaultControllerEnqueue(controller, chunk) {
+        const stream = controller._controlledTransformStream;
+        const readableController = stream._readable._readableStreamController;
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(readableController)) {
+            throw new TypeError('Readable side is not in a state that permits enqueue');
+        }
+        // We throttle transform invocations based on the backpressure of the ReadableStream, but we still
+        // accept TransformStreamDefaultControllerEnqueue() calls.
+        try {
+            ReadableStreamDefaultControllerEnqueue(readableController, chunk);
+        }
+        catch (e) {
+            // This happens when readableStrategy.size() throws.
+            TransformStreamErrorWritableAndUnblockWrite(stream, e);
+            throw stream._readable._storedError;
+        }
+        const backpressure = ReadableStreamDefaultControllerHasBackpressure(readableController);
+        if (backpressure !== stream._backpressure) {
+            TransformStreamSetBackpressure(stream, true);
+        }
+    }
+    function TransformStreamDefaultControllerError(controller, e) {
+        TransformStreamError(controller._controlledTransformStream, e);
+    }
+    function TransformStreamDefaultControllerPerformTransform(controller, chunk) {
+        const transformPromise = controller._transformAlgorithm(chunk);
+        return transformPromiseWith(transformPromise, undefined, r => {
+            TransformStreamError(controller._controlledTransformStream, r);
+            throw r;
+        });
+    }
+    function TransformStreamDefaultControllerTerminate(controller) {
+        const stream = controller._controlledTransformStream;
+        const readableController = stream._readable._readableStreamController;
+        ReadableStreamDefaultControllerClose(readableController);
+        const error = new TypeError('TransformStream terminated');
+        TransformStreamErrorWritableAndUnblockWrite(stream, error);
+    }
+    // TransformStreamDefaultSink Algorithms
+    function TransformStreamDefaultSinkWriteAlgorithm(stream, chunk) {
+        const controller = stream._transformStreamController;
+        if (stream._backpressure) {
+            const backpressureChangePromise = stream._backpressureChangePromise;
+            return transformPromiseWith(backpressureChangePromise, () => {
+                const writable = stream._writable;
+                const state = writable._state;
+                if (state === 'erroring') {
+                    throw writable._storedError;
+                }
+                return TransformStreamDefaultControllerPerformTransform(controller, chunk);
+            });
+        }
+        return TransformStreamDefaultControllerPerformTransform(controller, chunk);
+    }
+    function TransformStreamDefaultSinkAbortAlgorithm(stream, reason) {
+        // abort() is not called synchronously, so it is possible for abort() to be called when the stream is already
+        // errored.
+        TransformStreamError(stream, reason);
+        return promiseResolvedWith(undefined);
+    }
+    function TransformStreamDefaultSinkCloseAlgorithm(stream) {
+        // stream._readable cannot change after construction, so caching it across a call to user code is safe.
+        const readable = stream._readable;
+        const controller = stream._transformStreamController;
+        const flushPromise = controller._flushAlgorithm();
+        TransformStreamDefaultControllerClearAlgorithms(controller);
+        // Return a promise that is fulfilled with undefined on success.
+        return transformPromiseWith(flushPromise, () => {
+            if (readable._state === 'errored') {
+                throw readable._storedError;
+            }
+            ReadableStreamDefaultControllerClose(readable._readableStreamController);
+        }, r => {
+            TransformStreamError(stream, r);
+            throw readable._storedError;
+        });
+    }
+    // TransformStreamDefaultSource Algorithms
+    function TransformStreamDefaultSourcePullAlgorithm(stream) {
+        // Invariant. Enforced by the promises returned by start() and pull().
+        TransformStreamSetBackpressure(stream, false);
+        // Prevent the next pull() call until there is backpressure.
+        return stream._backpressureChangePromise;
+    }
+    // Helper functions for the TransformStreamDefaultController.
+    function defaultControllerBrandCheckException(name) {
+        return new TypeError(`TransformStreamDefaultController.prototype.${name} can only be used on a TransformStreamDefaultController`);
+    }
+    // Helper functions for the TransformStream.
+    function streamBrandCheckException(name) {
+        return new TypeError(`TransformStream.prototype.${name} can only be used on a TransformStream`);
+    }
+
+    exports.ByteLengthQueuingStrategy = ByteLengthQueuingStrategy;
+    exports.CountQueuingStrategy = CountQueuingStrategy;
+    exports.ReadableByteStreamController = ReadableByteStreamController;
+    exports.ReadableStream = ReadableStream;
+    exports.ReadableStreamBYOBReader = ReadableStreamBYOBReader;
+    exports.ReadableStreamBYOBRequest = ReadableStreamBYOBRequest;
+    exports.ReadableStreamDefaultController = ReadableStreamDefaultController;
+    exports.ReadableStreamDefaultReader = ReadableStreamDefaultReader;
+    exports.TransformStream = TransformStream;
+    exports.TransformStreamDefaultController = TransformStreamDefaultController;
+    exports.WritableStream = WritableStream;
+    exports.WritableStreamDefaultController = WritableStreamDefaultController;
+    exports.WritableStreamDefaultWriter = WritableStreamDefaultWriter;
+
+    Object.defineProperty(exports, '__esModule', { value: true });
+
+})));
+//# sourceMappingURL=ponyfill.es2018.js.map
diff --git a/node_modules/web-streams-polyfill/dist/ponyfill.es2018.js.map b/node_modules/web-streams-polyfill/dist/ponyfill.es2018.js.map
new file mode 100644
index 0000000..0b4238f
--- /dev/null
+++ b/node_modules/web-streams-polyfill/dist/ponyfill.es2018.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"ponyfill.es2018.js","sources":["../src/stub/symbol.ts","../src/utils.ts","../src/lib/helpers/miscellaneous.ts","../src/lib/helpers/webidl.ts","../src/lib/simple-queue.ts","../src/lib/readable-stream/generic-reader.ts","../src/lib/abstract-ops/internal-methods.ts","../src/stub/number-isfinite.ts","../src/stub/math-trunc.ts","../src/lib/validators/basic.ts","../src/lib/validators/readable-stream.ts","../src/lib/readable-stream/default-reader.ts","../src/target/es2018/stub/async-iterator-prototype.ts","../src/lib/readable-stream/async-iterator.ts","../src/stub/number-isnan.ts","../src/lib/abstract-ops/ecmascript.ts","../src/lib/abstract-ops/miscellaneous.ts","../src/lib/abstract-ops/queue-with-sizes.ts","../src/lib/readable-stream/byte-stream-controller.ts","../src/lib/readable-stream/byob-reader.ts","../src/lib/abstract-ops/queuing-strategy.ts","../src/lib/validators/queuing-strategy.ts","../src/lib/validators/underlying-sink.ts","../src/lib/validators/writable-stream.ts","../src/lib/abort-signal.ts","../src/lib/writable-stream.ts","../src/stub/native.ts","../src/stub/dom-exception.ts","../src/lib/readable-stream/pipe.ts","../src/lib/readable-stream/default-controller.ts","../src/lib/readable-stream/tee.ts","../src/lib/validators/underlying-source.ts","../src/lib/validators/reader-options.ts","../src/lib/validators/iterator-options.ts","../src/lib/validators/pipe-options.ts","../src/lib/validators/readable-writable-pair.ts","../src/lib/readable-stream.ts","../src/lib/validators/queuing-strategy-init.ts","../src/lib/byte-length-queuing-strategy.ts","../src/lib/count-queuing-strategy.ts","../src/lib/validators/transformer.ts","../src/lib/transform-stream.ts"],"sourcesContent":["/// <reference lib=\"es2015.symbol\" />\n\nconst SymbolPolyfill: (description?: string) => symbol =\n  typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol' ?\n    Symbol :\n    description => `Symbol(${description})` as any as symbol;\n\nexport default SymbolPolyfill;\n","/// <reference lib=\"dom\" />\n\nexport function noop(): undefined {\n  return undefined;\n}\n\nfunction getGlobals() {\n  if (typeof self !== 'undefined') {\n    return self;\n  } else if (typeof window !== 'undefined') {\n    return window;\n  } else if (typeof global !== 'undefined') {\n    return global;\n  }\n  return undefined;\n}\n\nexport const globals = getGlobals();\n","import { noop } from '../../utils';\nimport { AssertionError } from '../../stub/assert';\n\nexport function typeIsObject(x: any): x is object {\n  return (typeof x === 'object' && x !== null) || typeof x === 'function';\n}\n\nexport const rethrowAssertionErrorRejection: (e: any) => void =\n  DEBUG ? e => {\n    // Used throughout the reference implementation, as `.catch(rethrowAssertionErrorRejection)`, to ensure any errors\n    // get shown. There are places in the spec where we do promise transformations and purposefully ignore or don't\n    // expect any errors, but assertion errors are always problematic.\n    if (e && e instanceof AssertionError) {\n      setTimeout(() => {\n        throw e;\n      }, 0);\n    }\n  } : noop;\n","import { globals } from '../../utils';\nimport { rethrowAssertionErrorRejection } from './miscellaneous';\nimport assert from '../../stub/assert';\n\nconst originalPromise = Promise;\nconst originalPromiseThen = Promise.prototype.then;\nconst originalPromiseResolve = Promise.resolve.bind(originalPromise);\nconst originalPromiseReject = Promise.reject.bind(originalPromise);\n\nexport function newPromise<T>(executor: (\n  resolve: (value: T | PromiseLike<T>) => void,\n  reject: (reason?: any) => void\n) => void): Promise<T> {\n  return new originalPromise(executor);\n}\n\nexport function promiseResolvedWith<T>(value: T | PromiseLike<T>): Promise<T> {\n  return originalPromiseResolve(value);\n}\n\nexport function promiseRejectedWith<T = never>(reason: any): Promise<T> {\n  return originalPromiseReject(reason);\n}\n\nexport function PerformPromiseThen<T, TResult1 = T, TResult2 = never>(\n  promise: Promise<T>,\n  onFulfilled?: (value: T) => TResult1 | PromiseLike<TResult1>,\n  onRejected?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2> {\n  // There doesn't appear to be any way to correctly emulate the behaviour from JavaScript, so this is just an\n  // approximation.\n  return originalPromiseThen.call(promise, onFulfilled, onRejected) as Promise<TResult1 | TResult2>;\n}\n\nexport function uponPromise<T>(\n  promise: Promise<T>,\n  onFulfilled?: (value: T) => void | PromiseLike<void>,\n  onRejected?: (reason: any) => void | PromiseLike<void>): void {\n  PerformPromiseThen(\n    PerformPromiseThen(promise, onFulfilled, onRejected),\n    undefined,\n    rethrowAssertionErrorRejection\n  );\n}\n\nexport function uponFulfillment<T>(promise: Promise<T>, onFulfilled: (value: T) => void | PromiseLike<void>): void {\n  uponPromise(promise, onFulfilled);\n}\n\nexport function uponRejection(promise: Promise<unknown>, onRejected: (reason: any) => void | PromiseLike<void>): void {\n  uponPromise(promise, undefined, onRejected);\n}\n\nexport function transformPromiseWith<T, TResult1 = T, TResult2 = never>(\n  promise: Promise<T>,\n  fulfillmentHandler?: (value: T) => TResult1 | PromiseLike<TResult1>,\n  rejectionHandler?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2> {\n  return PerformPromiseThen(promise, fulfillmentHandler, rejectionHandler);\n}\n\nexport function setPromiseIsHandledToTrue(promise: Promise<unknown>): void {\n  PerformPromiseThen(promise, undefined, rethrowAssertionErrorRejection);\n}\n\nexport const queueMicrotask: (fn: () => void) => void = (() => {\n  const globalQueueMicrotask = globals && globals.queueMicrotask;\n  if (typeof globalQueueMicrotask === 'function') {\n    return globalQueueMicrotask;\n  }\n\n  const resolvedPromise = promiseResolvedWith(undefined);\n  return (fn: () => void) => PerformPromiseThen(resolvedPromise, fn);\n})();\n\nexport function reflectCall<T, A extends any[], R>(F: (this: T, ...fnArgs: A) => R, V: T, args: A): R {\n  if (typeof F !== 'function') {\n    throw new TypeError('Argument is not a function');\n  }\n  return Function.prototype.apply.call(F, V, args);\n}\n\nexport function promiseCall<T, A extends any[], R>(F: (this: T, ...fnArgs: A) => R | PromiseLike<R>,\n                                                   V: T,\n                                                   args: A): Promise<R> {\n  assert(typeof F === 'function');\n  assert(V !== undefined);\n  assert(Array.isArray(args));\n  try {\n    return promiseResolvedWith(reflectCall(F, V, args));\n  } catch (value) {\n    return promiseRejectedWith(value);\n  }\n}\n","import assert from '../stub/assert';\n\n// Original from Chromium\n// https://chromium.googlesource.com/chromium/src/+/0aee4434a4dba42a42abaea9bfbc0cd196a63bc1/third_party/blink/renderer/core/streams/SimpleQueue.js\n\nconst QUEUE_MAX_ARRAY_SIZE = 16384;\n\ninterface Node<T> {\n  _elements: T[];\n  _next: Node<T> | undefined;\n}\n\n/**\n * Simple queue structure.\n *\n * Avoids scalability issues with using a packed array directly by using\n * multiple arrays in a linked list and keeping the array size bounded.\n */\nexport class SimpleQueue<T> {\n  private _front: Node<T>;\n  private _back: Node<T>;\n  private _cursor = 0;\n  private _size = 0;\n\n  constructor() {\n    // _front and _back are always defined.\n    this._front = {\n      _elements: [],\n      _next: undefined\n    };\n    this._back = this._front;\n    // The cursor is used to avoid calling Array.shift().\n    // It contains the index of the front element of the array inside the\n    // front-most node. It is always in the range [0, QUEUE_MAX_ARRAY_SIZE).\n    this._cursor = 0;\n    // When there is only one node, size === elements.length - cursor.\n    this._size = 0;\n  }\n\n  get length(): number {\n    return this._size;\n  }\n\n  // For exception safety, this method is structured in order:\n  // 1. Read state\n  // 2. Calculate required state mutations\n  // 3. Perform state mutations\n  push(element: T): void {\n    const oldBack = this._back;\n    let newBack = oldBack;\n    assert(oldBack._next === undefined);\n    if (oldBack._elements.length === QUEUE_MAX_ARRAY_SIZE - 1) {\n      newBack = {\n        _elements: [],\n        _next: undefined\n      };\n    }\n\n    // push() is the mutation most likely to throw an exception, so it\n    // goes first.\n    oldBack._elements.push(element);\n    if (newBack !== oldBack) {\n      this._back = newBack;\n      oldBack._next = newBack;\n    }\n    ++this._size;\n  }\n\n  // Like push(), shift() follows the read -> calculate -> mutate pattern for\n  // exception safety.\n  shift(): T {\n    assert(this._size > 0); // must not be called on an empty queue\n\n    const oldFront = this._front;\n    let newFront = oldFront;\n    const oldCursor = this._cursor;\n    let newCursor = oldCursor + 1;\n\n    const elements = oldFront._elements;\n    const element = elements[oldCursor];\n\n    if (newCursor === QUEUE_MAX_ARRAY_SIZE) {\n      assert(elements.length === QUEUE_MAX_ARRAY_SIZE);\n      assert(oldFront._next !== undefined);\n      newFront = oldFront._next!;\n      newCursor = 0;\n    }\n\n    // No mutations before this point.\n    --this._size;\n    this._cursor = newCursor;\n    if (oldFront !== newFront) {\n      this._front = newFront;\n    }\n\n    // Permit shifted element to be garbage collected.\n    elements[oldCursor] = undefined!;\n\n    return element;\n  }\n\n  // The tricky thing about forEach() is that it can be called\n  // re-entrantly. The queue may be mutated inside the callback. It is easy to\n  // see that push() within the callback has no negative effects since the end\n  // of the queue is checked for on every iteration. If shift() is called\n  // repeatedly within the callback then the next iteration may return an\n  // element that has been removed. In this case the callback will be called\n  // with undefined values until we either \"catch up\" with elements that still\n  // exist or reach the back of the queue.\n  forEach(callback: (element: T) => void): void {\n    let i = this._cursor;\n    let node = this._front;\n    let elements = node._elements;\n    while (i !== elements.length || node._next !== undefined) {\n      if (i === elements.length) {\n        assert(node._next !== undefined);\n        assert(i === QUEUE_MAX_ARRAY_SIZE);\n        node = node._next!;\n        elements = node._elements;\n        i = 0;\n        if (elements.length === 0) {\n          break;\n        }\n      }\n      callback(elements[i]);\n      ++i;\n    }\n  }\n\n  // Return the element that would be returned if shift() was called now,\n  // without modifying the queue.\n  peek(): T {\n    assert(this._size > 0); // must not be called on an empty queue\n\n    const front = this._front;\n    const cursor = this._cursor;\n    return front._elements[cursor];\n  }\n}\n","import assert from '../../stub/assert';\nimport { ReadableStream, ReadableStreamCancel, ReadableStreamReader } from '../readable-stream';\nimport { newPromise, setPromiseIsHandledToTrue } from '../helpers/webidl';\n\nexport function ReadableStreamReaderGenericInitialize<R>(reader: ReadableStreamReader<R>, stream: ReadableStream<R>) {\n  reader._ownerReadableStream = stream;\n  stream._reader = reader;\n\n  if (stream._state === 'readable') {\n    defaultReaderClosedPromiseInitialize(reader);\n  } else if (stream._state === 'closed') {\n    defaultReaderClosedPromiseInitializeAsResolved(reader);\n  } else {\n    assert(stream._state === 'errored');\n\n    defaultReaderClosedPromiseInitializeAsRejected(reader, stream._storedError);\n  }\n}\n\n// A client of ReadableStreamDefaultReader and ReadableStreamBYOBReader may use these functions directly to bypass state\n// check.\n\nexport function ReadableStreamReaderGenericCancel(reader: ReadableStreamReader<any>, reason: any): Promise<undefined> {\n  const stream = reader._ownerReadableStream;\n  assert(stream !== undefined);\n  return ReadableStreamCancel(stream, reason);\n}\n\nexport function ReadableStreamReaderGenericRelease(reader: ReadableStreamReader<any>) {\n  assert(reader._ownerReadableStream !== undefined);\n  assert(reader._ownerReadableStream._reader === reader);\n\n  if (reader._ownerReadableStream._state === 'readable') {\n    defaultReaderClosedPromiseReject(\n      reader,\n      new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));\n  } else {\n    defaultReaderClosedPromiseResetToRejected(\n      reader,\n      new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));\n  }\n\n  reader._ownerReadableStream._reader = undefined;\n  reader._ownerReadableStream = undefined!;\n}\n\n// Helper functions for the readers.\n\nexport function readerLockException(name: string): TypeError {\n  return new TypeError('Cannot ' + name + ' a stream using a released reader');\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nexport function defaultReaderClosedPromiseInitialize(reader: ReadableStreamReader<any>) {\n  reader._closedPromise = newPromise((resolve, reject) => {\n    reader._closedPromise_resolve = resolve;\n    reader._closedPromise_reject = reject;\n  });\n}\n\nexport function defaultReaderClosedPromiseInitializeAsRejected(reader: ReadableStreamReader<any>, reason: any) {\n  defaultReaderClosedPromiseInitialize(reader);\n  defaultReaderClosedPromiseReject(reader, reason);\n}\n\nexport function defaultReaderClosedPromiseInitializeAsResolved(reader: ReadableStreamReader<any>) {\n  defaultReaderClosedPromiseInitialize(reader);\n  defaultReaderClosedPromiseResolve(reader);\n}\n\nexport function defaultReaderClosedPromiseReject(reader: ReadableStreamReader<any>, reason: any) {\n  if (reader._closedPromise_reject === undefined) {\n    return;\n  }\n\n  setPromiseIsHandledToTrue(reader._closedPromise);\n  reader._closedPromise_reject(reason);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n\nexport function defaultReaderClosedPromiseResetToRejected(reader: ReadableStreamReader<any>, reason: any) {\n  assert(reader._closedPromise_resolve === undefined);\n  assert(reader._closedPromise_reject === undefined);\n\n  defaultReaderClosedPromiseInitializeAsRejected(reader, reason);\n}\n\nexport function defaultReaderClosedPromiseResolve(reader: ReadableStreamReader<any>) {\n  if (reader._closedPromise_resolve === undefined) {\n    return;\n  }\n\n  reader._closedPromise_resolve(undefined);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n","export const AbortSteps = Symbol('[[AbortSteps]]');\nexport const ErrorSteps = Symbol('[[ErrorSteps]]');\nexport const CancelSteps = Symbol('[[CancelSteps]]');\nexport const PullSteps = Symbol('[[PullSteps]]');\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite#Polyfill\nconst NumberIsFinite: typeof Number.isFinite = Number.isFinite || function (x) {\n  return typeof x === 'number' && isFinite(x);\n};\n\nexport default NumberIsFinite;\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc#Polyfill\nconst MathTrunc: typeof Math.trunc = Math.trunc || function (v) {\n  return v < 0 ? Math.ceil(v) : Math.floor(v);\n};\n\nexport default MathTrunc;\n","import NumberIsFinite from '../../stub/number-isfinite';\nimport MathTrunc from '../../stub/math-trunc';\n\n// https://heycam.github.io/webidl/#idl-dictionaries\nexport function isDictionary(x: any): x is object | null {\n  return typeof x === 'object' || typeof x === 'function';\n}\n\nexport function assertDictionary(obj: unknown,\n                                 context: string): asserts obj is object | null | undefined {\n  if (obj !== undefined && !isDictionary(obj)) {\n    throw new TypeError(`${context} is not an object.`);\n  }\n}\n\nexport type AnyFunction = (...args: any[]) => any;\n\n// https://heycam.github.io/webidl/#idl-callback-functions\nexport function assertFunction(x: unknown, context: string): asserts x is AnyFunction {\n  if (typeof x !== 'function') {\n    throw new TypeError(`${context} is not a function.`);\n  }\n}\n\n// https://heycam.github.io/webidl/#idl-object\nexport function isObject(x: any): x is object {\n  return (typeof x === 'object' && x !== null) || typeof x === 'function';\n}\n\nexport function assertObject(x: unknown,\n                             context: string): asserts x is object {\n  if (!isObject(x)) {\n    throw new TypeError(`${context} is not an object.`);\n  }\n}\n\nexport function assertRequiredArgument<T extends any>(x: T | undefined,\n                                                      position: number,\n                                                      context: string): asserts x is T {\n  if (x === undefined) {\n    throw new TypeError(`Parameter ${position} is required in '${context}'.`);\n  }\n}\n\nexport function assertRequiredField<T extends any>(x: T | undefined,\n                                                   field: string,\n                                                   context: string): asserts x is T {\n  if (x === undefined) {\n    throw new TypeError(`${field} is required in '${context}'.`);\n  }\n}\n\n// https://heycam.github.io/webidl/#idl-unrestricted-double\nexport function convertUnrestrictedDouble(value: unknown): number {\n  return Number(value);\n}\n\nfunction censorNegativeZero(x: number): number {\n  return x === 0 ? 0 : x;\n}\n\nfunction integerPart(x: number): number {\n  return censorNegativeZero(MathTrunc(x));\n}\n\n// https://heycam.github.io/webidl/#idl-unsigned-long-long\nexport function convertUnsignedLongLongWithEnforceRange(value: unknown, context: string): number {\n  const lowerBound = 0;\n  const upperBound = Number.MAX_SAFE_INTEGER;\n\n  let x = Number(value);\n  x = censorNegativeZero(x);\n\n  if (!NumberIsFinite(x)) {\n    throw new TypeError(`${context} is not a finite number`);\n  }\n\n  x = integerPart(x);\n\n  if (x < lowerBound || x > upperBound) {\n    throw new TypeError(`${context} is outside the accepted range of ${lowerBound} to ${upperBound}, inclusive`);\n  }\n\n  if (!NumberIsFinite(x) || x === 0) {\n    return 0;\n  }\n\n  // TODO Use BigInt if supported?\n  // let xBigInt = BigInt(integerPart(x));\n  // xBigInt = BigInt.asUintN(64, xBigInt);\n  // return Number(xBigInt);\n\n  return x;\n}\n","import { IsReadableStream, ReadableStream } from '../readable-stream';\n\nexport function assertReadableStream(x: unknown, context: string): asserts x is ReadableStream {\n  if (!IsReadableStream(x)) {\n    throw new TypeError(`${context} is not a ReadableStream.`);\n  }\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericInitialize,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport { IsReadableStreamLocked, ReadableStream } from '../readable-stream';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { PullSteps } from '../abstract-ops/internal-methods';\nimport { newPromise, promiseRejectedWith } from '../helpers/webidl';\nimport { assertRequiredArgument } from '../validators/basic';\nimport { assertReadableStream } from '../validators/readable-stream';\n\n/**\n * A result returned by {@link ReadableStreamDefaultReader.read}.\n *\n * @public\n */\nexport type ReadableStreamDefaultReadResult<T> = {\n  done: false;\n  value: T;\n} | {\n  done: true;\n  value?: undefined;\n}\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamDefaultReader<R>(stream: ReadableStream): ReadableStreamDefaultReader<R> {\n  return new ReadableStreamDefaultReader(stream);\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamAddReadRequest<R>(stream: ReadableStream<R>,\n                                                readRequest: ReadRequest<R>): void {\n  assert(IsReadableStreamDefaultReader(stream._reader));\n  assert(stream._state === 'readable');\n\n  (stream._reader! as ReadableStreamDefaultReader<R>)._readRequests.push(readRequest);\n}\n\nexport function ReadableStreamFulfillReadRequest<R>(stream: ReadableStream<R>, chunk: R | undefined, done: boolean) {\n  const reader = stream._reader as ReadableStreamDefaultReader<R>;\n\n  assert(reader._readRequests.length > 0);\n\n  const readRequest = reader._readRequests.shift()!;\n  if (done) {\n    readRequest._closeSteps();\n  } else {\n    readRequest._chunkSteps(chunk!);\n  }\n}\n\nexport function ReadableStreamGetNumReadRequests<R>(stream: ReadableStream<R>): number {\n  return (stream._reader as ReadableStreamDefaultReader<R>)._readRequests.length;\n}\n\nexport function ReadableStreamHasDefaultReader(stream: ReadableStream): boolean {\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return false;\n  }\n\n  if (!IsReadableStreamDefaultReader(reader)) {\n    return false;\n  }\n\n  return true;\n}\n\n// Readers\n\nexport interface ReadRequest<R> {\n  _chunkSteps(chunk: R): void;\n\n  _closeSteps(): void;\n\n  _errorSteps(e: any): void;\n}\n\n/**\n * A default reader vended by a {@link ReadableStream}.\n *\n * @public\n */\nexport class ReadableStreamDefaultReader<R = any> {\n  /** @internal */\n  _ownerReadableStream!: ReadableStream<R>;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readRequests: SimpleQueue<ReadRequest<R>>;\n\n  constructor(stream: ReadableStream<R>) {\n    assertRequiredArgument(stream, 1, 'ReadableStreamDefaultReader');\n    assertReadableStream(stream, 'First parameter');\n\n    if (IsReadableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n    }\n\n    ReadableStreamReaderGenericInitialize(this, stream);\n\n    this._readRequests = new SimpleQueue();\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed,\n   * or rejected if the stream ever errors or the reader's lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('cancel'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('cancel'));\n    }\n\n    return ReadableStreamReaderGenericCancel(this, reason);\n  }\n\n  /**\n   * Returns a promise that allows access to the next chunk from the stream's internal queue, if available.\n   *\n   * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.\n   */\n  read(): Promise<ReadableStreamDefaultReadResult<R>> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('read'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('read from'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamDefaultReadResult<R>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamDefaultReadResult<R>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),\n      _closeSteps: () => resolvePromise({ value: undefined, done: true }),\n      _errorSteps: e => rejectPromise(e)\n    };\n    ReadableStreamDefaultReaderRead(this, readRequest);\n    return promise;\n  }\n\n  /**\n   * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.\n   * If the associated stream is errored when the lock is released, the reader will appear errored in the same way\n   * from now on; otherwise, the reader will appear closed.\n   *\n   * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by\n   * the reader's {@link ReadableStreamDefaultReader.read | read()} method has not yet been settled. Attempting to\n   * do so will throw a `TypeError` and leave the reader locked to the stream.\n   */\n  releaseLock(): void {\n    if (!IsReadableStreamDefaultReader(this)) {\n      throw defaultReaderBrandCheckException('releaseLock');\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return;\n    }\n\n    if (this._readRequests.length > 0) {\n      throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n    }\n\n    ReadableStreamReaderGenericRelease(this);\n  }\n}\n\nObject.defineProperties(ReadableStreamDefaultReader.prototype, {\n  cancel: { enumerable: true },\n  read: { enumerable: true },\n  releaseLock: { enumerable: true },\n  closed: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamDefaultReader.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamDefaultReader',\n    configurable: true\n  });\n}\n\n// Abstract operations for the readers.\n\nexport function IsReadableStreamDefaultReader<R = any>(x: any): x is ReadableStreamDefaultReader<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readRequests')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamDefaultReader;\n}\n\nexport function ReadableStreamDefaultReaderRead<R>(reader: ReadableStreamDefaultReader<R>,\n                                                   readRequest: ReadRequest<R>): void {\n  const stream = reader._ownerReadableStream;\n\n  assert(stream !== undefined);\n\n  stream._disturbed = true;\n\n  if (stream._state === 'closed') {\n    readRequest._closeSteps();\n  } else if (stream._state === 'errored') {\n    readRequest._errorSteps(stream._storedError);\n  } else {\n    assert(stream._state === 'readable');\n    stream._readableStreamController[PullSteps](readRequest as ReadRequest<any>);\n  }\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nfunction defaultReaderBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamDefaultReader.prototype.${name} can only be used on a ReadableStreamDefaultReader`);\n}\n","/// <reference lib=\"es2018.asynciterable\" />\n\n/* eslint-disable @typescript-eslint/no-empty-function */\nexport const AsyncIteratorPrototype: AsyncIterable<any> | undefined =\n  Object.getPrototypeOf(Object.getPrototypeOf(async function* (): AsyncIterableIterator<any> {}).prototype);\n","/// <reference lib=\"es2018.asynciterable\" />\n\nimport { ReadableStream } from '../readable-stream';\nimport {\n  AcquireReadableStreamDefaultReader,\n  ReadableStreamDefaultReader,\n  ReadableStreamDefaultReaderRead,\n  ReadableStreamDefaultReadResult,\n  ReadRequest\n} from './default-reader';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport assert from '../../stub/assert';\nimport { AsyncIteratorPrototype } from '@@target/stub/async-iterator-prototype';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport {\n  newPromise,\n  promiseRejectedWith,\n  promiseResolvedWith,\n  queueMicrotask,\n  transformPromiseWith\n} from '../helpers/webidl';\n\n/**\n * An async iterator returned by {@link ReadableStream.values}.\n *\n * @public\n */\nexport interface ReadableStreamAsyncIterator<R> extends AsyncIterator<R> {\n  next(): Promise<IteratorResult<R, undefined>>;\n\n  return(value?: any): Promise<IteratorResult<any>>;\n}\n\nexport class ReadableStreamAsyncIteratorImpl<R> {\n  private readonly _reader: ReadableStreamDefaultReader<R>;\n  private readonly _preventCancel: boolean;\n  private _ongoingPromise: Promise<ReadableStreamDefaultReadResult<R>> | undefined = undefined;\n  private _isFinished = false;\n\n  constructor(reader: ReadableStreamDefaultReader<R>, preventCancel: boolean) {\n    this._reader = reader;\n    this._preventCancel = preventCancel;\n  }\n\n  next(): Promise<ReadableStreamDefaultReadResult<R>> {\n    const nextSteps = () => this._nextSteps();\n    this._ongoingPromise = this._ongoingPromise ?\n      transformPromiseWith(this._ongoingPromise, nextSteps, nextSteps) :\n      nextSteps();\n    return this._ongoingPromise;\n  }\n\n  return(value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    const returnSteps = () => this._returnSteps(value);\n    return this._ongoingPromise ?\n      transformPromiseWith(this._ongoingPromise, returnSteps, returnSteps) :\n      returnSteps();\n  }\n\n  private _nextSteps(): Promise<ReadableStreamDefaultReadResult<R>> {\n    if (this._isFinished) {\n      return Promise.resolve({ value: undefined, done: true });\n    }\n\n    const reader = this._reader;\n    if (reader._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('iterate'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamDefaultReadResult<R>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamDefaultReadResult<R>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => {\n        this._ongoingPromise = undefined;\n        // This needs to be delayed by one microtask, otherwise we stop pulling too early which breaks a test.\n        // FIXME Is this a bug in the specification, or in the test?\n        queueMicrotask(() => resolvePromise({ value: chunk, done: false }));\n      },\n      _closeSteps: () => {\n        this._ongoingPromise = undefined;\n        this._isFinished = true;\n        ReadableStreamReaderGenericRelease(reader);\n        resolvePromise({ value: undefined, done: true });\n      },\n      _errorSteps: reason => {\n        this._ongoingPromise = undefined;\n        this._isFinished = true;\n        ReadableStreamReaderGenericRelease(reader);\n        rejectPromise(reason);\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n    return promise;\n  }\n\n  private _returnSteps(value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (this._isFinished) {\n      return Promise.resolve({ value, done: true });\n    }\n    this._isFinished = true;\n\n    const reader = this._reader;\n    if (reader._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('finish iterating'));\n    }\n\n    assert(reader._readRequests.length === 0);\n\n    if (!this._preventCancel) {\n      const result = ReadableStreamReaderGenericCancel(reader, value);\n      ReadableStreamReaderGenericRelease(reader);\n      return transformPromiseWith(result, () => ({ value, done: true }));\n    }\n\n    ReadableStreamReaderGenericRelease(reader);\n    return promiseResolvedWith({ value, done: true });\n  }\n}\n\ndeclare class ReadableStreamAsyncIteratorInstance<R> implements ReadableStreamAsyncIterator<R> {\n  /** @interal */\n  _asyncIteratorImpl: ReadableStreamAsyncIteratorImpl<R>;\n\n  next(): Promise<IteratorResult<R, undefined>>;\n\n  return(value?: any): Promise<IteratorResult<any>>;\n}\n\nconst ReadableStreamAsyncIteratorPrototype: ReadableStreamAsyncIteratorInstance<any> = {\n  next(this: ReadableStreamAsyncIteratorInstance<any>): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (!IsReadableStreamAsyncIterator(this)) {\n      return promiseRejectedWith(streamAsyncIteratorBrandCheckException('next'));\n    }\n    return this._asyncIteratorImpl.next();\n  },\n\n  return(this: ReadableStreamAsyncIteratorInstance<any>, value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (!IsReadableStreamAsyncIterator(this)) {\n      return promiseRejectedWith(streamAsyncIteratorBrandCheckException('return'));\n    }\n    return this._asyncIteratorImpl.return(value);\n  }\n} as any;\nif (AsyncIteratorPrototype !== undefined) {\n  Object.setPrototypeOf(ReadableStreamAsyncIteratorPrototype, AsyncIteratorPrototype);\n}\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamAsyncIterator<R>(stream: ReadableStream<R>,\n                                                      preventCancel: boolean): ReadableStreamAsyncIterator<R> {\n  const reader = AcquireReadableStreamDefaultReader<R>(stream);\n  const impl = new ReadableStreamAsyncIteratorImpl(reader, preventCancel);\n  const iterator: ReadableStreamAsyncIteratorInstance<R> = Object.create(ReadableStreamAsyncIteratorPrototype);\n  iterator._asyncIteratorImpl = impl;\n  return iterator;\n}\n\nfunction IsReadableStreamAsyncIterator<R = any>(x: any): x is ReadableStreamAsyncIterator<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_asyncIteratorImpl')) {\n    return false;\n  }\n\n  try {\n    // noinspection SuspiciousTypeOfGuard\n    return (x as ReadableStreamAsyncIteratorInstance<any>)._asyncIteratorImpl instanceof\n      ReadableStreamAsyncIteratorImpl;\n  } catch {\n    return false;\n  }\n}\n\n// Helper functions for the ReadableStream.\n\nfunction streamAsyncIteratorBrandCheckException(name: string): TypeError {\n  return new TypeError(`ReadableStreamAsyncIterator.${name} can only be used on a ReadableSteamAsyncIterator`);\n}\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Polyfill\nconst NumberIsNaN: typeof Number.isNaN = Number.isNaN || function (x) {\n  // eslint-disable-next-line no-self-compare\n  return x !== x;\n};\n\nexport default NumberIsNaN;\n","export function CreateArrayFromList<T extends any[]>(elements: T): T {\n  // We use arrays to represent lists, so this is basically a no-op.\n  // Do a slice though just in case we happen to depend on the unique-ness.\n  return elements.slice() as T;\n}\n\nexport function CopyDataBlockBytes(dest: ArrayBuffer,\n                                   destOffset: number,\n                                   src: ArrayBuffer,\n                                   srcOffset: number,\n                                   n: number) {\n  new Uint8Array(dest).set(new Uint8Array(src, srcOffset, n), destOffset);\n}\n\n// Not implemented correctly\nexport function TransferArrayBuffer<T extends ArrayBufferLike>(O: T): T {\n  return O;\n}\n\n// Not implemented correctly\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nexport function CanTransferArrayBuffer(O: ArrayBufferLike): boolean {\n  return true;\n}\n\n// Not implemented correctly\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nexport function IsDetachedBuffer(O: ArrayBufferLike): boolean {\n  return false;\n}\n\nexport function ArrayBufferSlice(buffer: ArrayBufferLike, begin: number, end: number): ArrayBufferLike {\n  // ArrayBuffer.prototype.slice is not available on IE10\n  // https://www.caniuse.com/mdn-javascript_builtins_arraybuffer_slice\n  if (buffer.slice) {\n    return buffer.slice(begin, end);\n  }\n  const length = end - begin;\n  const slice = new ArrayBuffer(length);\n  CopyDataBlockBytes(slice, 0, buffer, begin, length);\n  return slice;\n}\n","import NumberIsNaN from '../../stub/number-isnan';\nimport { ArrayBufferSlice } from './ecmascript';\n\nexport function IsNonNegativeNumber(v: number): boolean {\n  if (typeof v !== 'number') {\n    return false;\n  }\n\n  if (NumberIsNaN(v)) {\n    return false;\n  }\n\n  if (v < 0) {\n    return false;\n  }\n\n  return true;\n}\n\nexport function CloneAsUint8Array(O: ArrayBufferView): Uint8Array {\n  const buffer = ArrayBufferSlice(O.buffer, O.byteOffset, O.byteOffset + O.byteLength);\n  return new Uint8Array(buffer);\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport { IsNonNegativeNumber } from './miscellaneous';\n\nexport interface QueueContainer<T> {\n  _queue: SimpleQueue<T>;\n  _queueTotalSize: number;\n}\n\nexport interface QueuePair<T> {\n  value: T;\n  size: number;\n}\n\nexport function DequeueValue<T>(container: QueueContainer<QueuePair<T>>): T {\n  assert('_queue' in container && '_queueTotalSize' in container);\n  assert(container._queue.length > 0);\n\n  const pair = container._queue.shift()!;\n  container._queueTotalSize -= pair.size;\n  if (container._queueTotalSize < 0) {\n    container._queueTotalSize = 0;\n  }\n\n  return pair.value;\n}\n\nexport function EnqueueValueWithSize<T>(container: QueueContainer<QueuePair<T>>, value: T, size: number) {\n  assert('_queue' in container && '_queueTotalSize' in container);\n\n  if (!IsNonNegativeNumber(size) || size === Infinity) {\n    throw new RangeError('Size must be a finite, non-NaN, non-negative number.');\n  }\n\n  container._queue.push({ value, size });\n  container._queueTotalSize += size;\n}\n\nexport function PeekQueueValue<T>(container: QueueContainer<QueuePair<T>>): T {\n  assert('_queue' in container && '_queueTotalSize' in container);\n  assert(container._queue.length > 0);\n\n  const pair = container._queue.peek();\n  return pair.value;\n}\n\nexport function ResetQueue<T>(container: QueueContainer<T>) {\n  assert('_queue' in container && '_queueTotalSize' in container);\n\n  container._queue = new SimpleQueue<T>();\n  container._queueTotalSize = 0;\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport { ResetQueue } from '../abstract-ops/queue-with-sizes';\nimport {\n  ReadableStreamAddReadRequest,\n  ReadableStreamFulfillReadRequest,\n  ReadableStreamGetNumReadRequests,\n  ReadableStreamHasDefaultReader,\n  ReadRequest\n} from './default-reader';\nimport {\n  ReadableStreamAddReadIntoRequest,\n  ReadableStreamFulfillReadIntoRequest,\n  ReadableStreamGetNumReadIntoRequests,\n  ReadableStreamHasBYOBReader,\n  ReadIntoRequest\n} from './byob-reader';\nimport NumberIsInteger from '../../stub/number-isinteger';\nimport {\n  IsReadableStreamLocked,\n  ReadableByteStream,\n  ReadableStreamClose,\n  ReadableStreamError\n} from '../readable-stream';\nimport { ValidatedUnderlyingByteSource } from './underlying-source';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport {\n  ArrayBufferSlice,\n  CanTransferArrayBuffer,\n  CopyDataBlockBytes,\n  IsDetachedBuffer,\n  TransferArrayBuffer\n} from '../abstract-ops/ecmascript';\nimport { CancelSteps, PullSteps } from '../abstract-ops/internal-methods';\nimport { promiseResolvedWith, uponPromise } from '../helpers/webidl';\nimport { assertRequiredArgument, convertUnsignedLongLongWithEnforceRange } from '../validators/basic';\n\n/**\n * A pull-into request in a {@link ReadableByteStreamController}.\n *\n * @public\n */\nexport class ReadableStreamBYOBRequest {\n  /** @internal */\n  _associatedReadableByteStreamController!: ReadableByteStreamController;\n  /** @internal */\n  _view!: ArrayBufferView | null;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the view for writing in to, or `null` if the BYOB request has already been responded to.\n   */\n  get view(): ArrayBufferView | null {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('view');\n    }\n\n    return this._view;\n  }\n\n  /**\n   * Indicates to the associated readable byte stream that `bytesWritten` bytes were written into\n   * {@link ReadableStreamBYOBRequest.view | view}, causing the result be surfaced to the consumer.\n   *\n   * After this method is called, {@link ReadableStreamBYOBRequest.view | view} will be transferred and no longer\n   * modifiable.\n   */\n  respond(bytesWritten: number): void;\n  respond(bytesWritten: number | undefined): void {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('respond');\n    }\n    assertRequiredArgument(bytesWritten, 1, 'respond');\n    bytesWritten = convertUnsignedLongLongWithEnforceRange(bytesWritten, 'First parameter');\n\n    if (this._associatedReadableByteStreamController === undefined) {\n      throw new TypeError('This BYOB request has been invalidated');\n    }\n\n    if (IsDetachedBuffer(this._view!.buffer)) {\n      throw new TypeError(`The BYOB request's buffer has been detached and so cannot be used as a response`);\n    }\n\n    assert(this._view!.byteLength > 0);\n    assert(this._view!.buffer.byteLength > 0);\n\n    ReadableByteStreamControllerRespond(this._associatedReadableByteStreamController, bytesWritten);\n  }\n\n  /**\n   * Indicates to the associated readable byte stream that instead of writing into\n   * {@link ReadableStreamBYOBRequest.view | view}, the underlying byte source is providing a new `ArrayBufferView`,\n   * which will be given to the consumer of the readable byte stream.\n   *\n   * After this method is called, `view` will be transferred and no longer modifiable.\n   */\n  respondWithNewView(view: ArrayBufferView): void;\n  respondWithNewView(view: ArrayBufferView | undefined): void {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('respondWithNewView');\n    }\n    assertRequiredArgument(view, 1, 'respondWithNewView');\n\n    if (!ArrayBuffer.isView(view)) {\n      throw new TypeError('You can only respond with array buffer views');\n    }\n\n    if (this._associatedReadableByteStreamController === undefined) {\n      throw new TypeError('This BYOB request has been invalidated');\n    }\n\n    if (IsDetachedBuffer(view.buffer)) {\n      throw new TypeError('The given view\\'s buffer has been detached and so cannot be used as a response');\n    }\n\n    ReadableByteStreamControllerRespondWithNewView(this._associatedReadableByteStreamController, view);\n  }\n}\n\nObject.defineProperties(ReadableStreamBYOBRequest.prototype, {\n  respond: { enumerable: true },\n  respondWithNewView: { enumerable: true },\n  view: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamBYOBRequest.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamBYOBRequest',\n    configurable: true\n  });\n}\n\ninterface ArrayBufferViewConstructor<T extends ArrayBufferView = ArrayBufferView> {\n  new(buffer: ArrayBufferLike, byteOffset: number, length?: number): T;\n\n  readonly prototype: T;\n  readonly BYTES_PER_ELEMENT: number;\n}\n\ninterface ByteQueueElement {\n  buffer: ArrayBufferLike;\n  byteOffset: number;\n  byteLength: number;\n}\n\ntype PullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> =\n  DefaultPullIntoDescriptor\n  | BYOBPullIntoDescriptor<T>;\n\ninterface DefaultPullIntoDescriptor {\n  buffer: ArrayBufferLike;\n  bufferByteLength: number;\n  byteOffset: number;\n  byteLength: number;\n  bytesFilled: number;\n  elementSize: number;\n  viewConstructor: ArrayBufferViewConstructor<Uint8Array>;\n  readerType: 'default';\n}\n\ninterface BYOBPullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> {\n  buffer: ArrayBufferLike;\n  bufferByteLength: number;\n  byteOffset: number;\n  byteLength: number;\n  bytesFilled: number;\n  elementSize: number;\n  viewConstructor: ArrayBufferViewConstructor<T>;\n  readerType: 'byob';\n}\n\n/**\n * Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue.\n *\n * @public\n */\nexport class ReadableByteStreamController {\n  /** @internal */\n  _controlledReadableByteStream!: ReadableByteStream;\n  /** @internal */\n  _queue!: SimpleQueue<ByteQueueElement>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _closeRequested!: boolean;\n  /** @internal */\n  _pullAgain!: boolean;\n  /** @internal */\n  _pulling !: boolean;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _pullAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _cancelAlgorithm!: (reason: any) => Promise<void>;\n  /** @internal */\n  _autoAllocateChunkSize: number | undefined;\n  /** @internal */\n  _byobRequest: ReadableStreamBYOBRequest | null;\n  /** @internal */\n  _pendingPullIntos!: SimpleQueue<PullIntoDescriptor>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the current BYOB pull request, or `null` if there isn't one.\n   */\n  get byobRequest(): ReadableStreamBYOBRequest | null {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('byobRequest');\n    }\n\n    return ReadableByteStreamControllerGetBYOBRequest(this);\n  }\n\n  /**\n   * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is\n   * over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure.\n   */\n  get desiredSize(): number | null {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('desiredSize');\n    }\n\n    return ReadableByteStreamControllerGetDesiredSize(this);\n  }\n\n  /**\n   * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from\n   * the stream, but once those are read, the stream will become closed.\n   */\n  close(): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('close');\n    }\n\n    if (this._closeRequested) {\n      throw new TypeError('The stream has already been closed; do not close it again!');\n    }\n\n    const state = this._controlledReadableByteStream._state;\n    if (state !== 'readable') {\n      throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be closed`);\n    }\n\n    ReadableByteStreamControllerClose(this);\n  }\n\n  /**\n   * Enqueues the given chunk chunk in the controlled readable stream.\n   * The chunk has to be an `ArrayBufferView` instance, or else a `TypeError` will be thrown.\n   */\n  enqueue(chunk: ArrayBufferView): void;\n  enqueue(chunk: ArrayBufferView | undefined): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('enqueue');\n    }\n\n    assertRequiredArgument(chunk, 1, 'enqueue');\n    if (!ArrayBuffer.isView(chunk)) {\n      throw new TypeError('chunk must be an array buffer view');\n    }\n    if (chunk.byteLength === 0) {\n      throw new TypeError('chunk must have non-zero byteLength');\n    }\n    if (chunk.buffer.byteLength === 0) {\n      throw new TypeError(`chunk's buffer must have non-zero byteLength`);\n    }\n\n    if (this._closeRequested) {\n      throw new TypeError('stream is closed or draining');\n    }\n\n    const state = this._controlledReadableByteStream._state;\n    if (state !== 'readable') {\n      throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be enqueued to`);\n    }\n\n    ReadableByteStreamControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.\n   */\n  error(e: any = undefined): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('error');\n    }\n\n    ReadableByteStreamControllerError(this, e);\n  }\n\n  /** @internal */\n  [CancelSteps](reason: any): Promise<void> {\n    ReadableByteStreamControllerClearPendingPullIntos(this);\n\n    ResetQueue(this);\n\n    const result = this._cancelAlgorithm(reason);\n    ReadableByteStreamControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [PullSteps](readRequest: ReadRequest<Uint8Array>): void {\n    const stream = this._controlledReadableByteStream;\n    assert(ReadableStreamHasDefaultReader(stream));\n\n    if (this._queueTotalSize > 0) {\n      assert(ReadableStreamGetNumReadRequests(stream) === 0);\n\n      const entry = this._queue.shift()!;\n      this._queueTotalSize -= entry.byteLength;\n\n      ReadableByteStreamControllerHandleQueueDrain(this);\n\n      const view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);\n\n      readRequest._chunkSteps(view);\n      return;\n    }\n\n    const autoAllocateChunkSize = this._autoAllocateChunkSize;\n    if (autoAllocateChunkSize !== undefined) {\n      let buffer: ArrayBuffer;\n      try {\n        buffer = new ArrayBuffer(autoAllocateChunkSize);\n      } catch (bufferE) {\n        readRequest._errorSteps(bufferE);\n        return;\n      }\n\n      const pullIntoDescriptor: DefaultPullIntoDescriptor = {\n        buffer,\n        bufferByteLength: autoAllocateChunkSize,\n        byteOffset: 0,\n        byteLength: autoAllocateChunkSize,\n        bytesFilled: 0,\n        elementSize: 1,\n        viewConstructor: Uint8Array,\n        readerType: 'default'\n      };\n\n      this._pendingPullIntos.push(pullIntoDescriptor);\n    }\n\n    ReadableStreamAddReadRequest(stream, readRequest);\n    ReadableByteStreamControllerCallPullIfNeeded(this);\n  }\n}\n\nObject.defineProperties(ReadableByteStreamController.prototype, {\n  close: { enumerable: true },\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  byobRequest: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableByteStreamController.prototype, Symbol.toStringTag, {\n    value: 'ReadableByteStreamController',\n    configurable: true\n  });\n}\n\n// Abstract operations for the ReadableByteStreamController.\n\nexport function IsReadableByteStreamController(x: any): x is ReadableByteStreamController {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableByteStream')) {\n    return false;\n  }\n\n  return x instanceof ReadableByteStreamController;\n}\n\nfunction IsReadableStreamBYOBRequest(x: any): x is ReadableStreamBYOBRequest {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_associatedReadableByteStreamController')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamBYOBRequest;\n}\n\nfunction ReadableByteStreamControllerCallPullIfNeeded(controller: ReadableByteStreamController): void {\n  const shouldPull = ReadableByteStreamControllerShouldCallPull(controller);\n  if (!shouldPull) {\n    return;\n  }\n\n  if (controller._pulling) {\n    controller._pullAgain = true;\n    return;\n  }\n\n  assert(!controller._pullAgain);\n\n  controller._pulling = true;\n\n  // TODO: Test controller argument\n  const pullPromise = controller._pullAlgorithm();\n  uponPromise(\n    pullPromise,\n    () => {\n      controller._pulling = false;\n\n      if (controller._pullAgain) {\n        controller._pullAgain = false;\n        ReadableByteStreamControllerCallPullIfNeeded(controller);\n      }\n    },\n    e => {\n      ReadableByteStreamControllerError(controller, e);\n    }\n  );\n}\n\nfunction ReadableByteStreamControllerClearPendingPullIntos(controller: ReadableByteStreamController) {\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n  controller._pendingPullIntos = new SimpleQueue();\n}\n\nfunction ReadableByteStreamControllerCommitPullIntoDescriptor<T extends ArrayBufferView>(\n  stream: ReadableByteStream,\n  pullIntoDescriptor: PullIntoDescriptor<T>\n) {\n  assert(stream._state !== 'errored');\n\n  let done = false;\n  if (stream._state === 'closed') {\n    assert(pullIntoDescriptor.bytesFilled === 0);\n    done = true;\n  }\n\n  const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);\n  if (pullIntoDescriptor.readerType === 'default') {\n    ReadableStreamFulfillReadRequest(stream, filledView as unknown as Uint8Array, done);\n  } else {\n    assert(pullIntoDescriptor.readerType === 'byob');\n    ReadableStreamFulfillReadIntoRequest(stream, filledView, done);\n  }\n}\n\nfunction ReadableByteStreamControllerConvertPullIntoDescriptor<T extends ArrayBufferView>(\n  pullIntoDescriptor: PullIntoDescriptor<T>\n): T {\n  const bytesFilled = pullIntoDescriptor.bytesFilled;\n  const elementSize = pullIntoDescriptor.elementSize;\n\n  assert(bytesFilled <= pullIntoDescriptor.byteLength);\n  assert(bytesFilled % elementSize === 0);\n\n  return new pullIntoDescriptor.viewConstructor(\n    pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize) as T;\n}\n\nfunction ReadableByteStreamControllerEnqueueChunkToQueue(controller: ReadableByteStreamController,\n                                                         buffer: ArrayBufferLike,\n                                                         byteOffset: number,\n                                                         byteLength: number) {\n  controller._queue.push({ buffer, byteOffset, byteLength });\n  controller._queueTotalSize += byteLength;\n}\n\nfunction ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller: ReadableByteStreamController,\n                                                                     pullIntoDescriptor: PullIntoDescriptor) {\n  const elementSize = pullIntoDescriptor.elementSize;\n\n  const currentAlignedBytes = pullIntoDescriptor.bytesFilled - pullIntoDescriptor.bytesFilled % elementSize;\n\n  const maxBytesToCopy = Math.min(controller._queueTotalSize,\n                                  pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled);\n  const maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;\n  const maxAlignedBytes = maxBytesFilled - maxBytesFilled % elementSize;\n\n  let totalBytesToCopyRemaining = maxBytesToCopy;\n  let ready = false;\n  if (maxAlignedBytes > currentAlignedBytes) {\n    totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled;\n    ready = true;\n  }\n\n  const queue = controller._queue;\n\n  while (totalBytesToCopyRemaining > 0) {\n    const headOfQueue = queue.peek();\n\n    const bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength);\n\n    const destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n    CopyDataBlockBytes(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy);\n\n    if (headOfQueue.byteLength === bytesToCopy) {\n      queue.shift();\n    } else {\n      headOfQueue.byteOffset += bytesToCopy;\n      headOfQueue.byteLength -= bytesToCopy;\n    }\n    controller._queueTotalSize -= bytesToCopy;\n\n    ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor);\n\n    totalBytesToCopyRemaining -= bytesToCopy;\n  }\n\n  if (!ready) {\n    assert(controller._queueTotalSize === 0);\n    assert(pullIntoDescriptor.bytesFilled > 0);\n    assert(pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize);\n  }\n\n  return ready;\n}\n\nfunction ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller: ReadableByteStreamController,\n                                                                size: number,\n                                                                pullIntoDescriptor: PullIntoDescriptor) {\n  assert(controller._pendingPullIntos.length === 0 || controller._pendingPullIntos.peek() === pullIntoDescriptor);\n  assert(controller._byobRequest === null);\n  pullIntoDescriptor.bytesFilled += size;\n}\n\nfunction ReadableByteStreamControllerHandleQueueDrain(controller: ReadableByteStreamController) {\n  assert(controller._controlledReadableByteStream._state === 'readable');\n\n  if (controller._queueTotalSize === 0 && controller._closeRequested) {\n    ReadableByteStreamControllerClearAlgorithms(controller);\n    ReadableStreamClose(controller._controlledReadableByteStream);\n  } else {\n    ReadableByteStreamControllerCallPullIfNeeded(controller);\n  }\n}\n\nfunction ReadableByteStreamControllerInvalidateBYOBRequest(controller: ReadableByteStreamController) {\n  if (controller._byobRequest === null) {\n    return;\n  }\n\n  controller._byobRequest._associatedReadableByteStreamController = undefined!;\n  controller._byobRequest._view = null!;\n  controller._byobRequest = null;\n}\n\nfunction ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller: ReadableByteStreamController) {\n  assert(!controller._closeRequested);\n\n  while (controller._pendingPullIntos.length > 0) {\n    if (controller._queueTotalSize === 0) {\n      return;\n    }\n\n    const pullIntoDescriptor = controller._pendingPullIntos.peek();\n\n    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {\n      ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n      ReadableByteStreamControllerCommitPullIntoDescriptor(\n        controller._controlledReadableByteStream,\n        pullIntoDescriptor\n      );\n    }\n  }\n}\n\nexport function ReadableByteStreamControllerPullInto<T extends ArrayBufferView>(\n  controller: ReadableByteStreamController,\n  view: T,\n  readIntoRequest: ReadIntoRequest<T>\n): void {\n  const stream = controller._controlledReadableByteStream;\n\n  let elementSize = 1;\n  if (view.constructor !== DataView) {\n    elementSize = (view.constructor as ArrayBufferViewConstructor<T>).BYTES_PER_ELEMENT;\n  }\n\n  const ctor = view.constructor as ArrayBufferViewConstructor<T>;\n\n  // try {\n  const buffer = TransferArrayBuffer(view.buffer);\n  // } catch (e) {\n  //   readIntoRequest._errorSteps(e);\n  //   return;\n  // }\n\n  const pullIntoDescriptor: BYOBPullIntoDescriptor<T> = {\n    buffer,\n    bufferByteLength: buffer.byteLength,\n    byteOffset: view.byteOffset,\n    byteLength: view.byteLength,\n    bytesFilled: 0,\n    elementSize,\n    viewConstructor: ctor,\n    readerType: 'byob'\n  };\n\n  if (controller._pendingPullIntos.length > 0) {\n    controller._pendingPullIntos.push(pullIntoDescriptor);\n\n    // No ReadableByteStreamControllerCallPullIfNeeded() call since:\n    // - No change happens on desiredSize\n    // - The source has already been notified of that there's at least 1 pending read(view)\n\n    ReadableStreamAddReadIntoRequest(stream, readIntoRequest);\n    return;\n  }\n\n  if (stream._state === 'closed') {\n    const emptyView = new ctor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0);\n    readIntoRequest._closeSteps(emptyView);\n    return;\n  }\n\n  if (controller._queueTotalSize > 0) {\n    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {\n      const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);\n\n      ReadableByteStreamControllerHandleQueueDrain(controller);\n\n      readIntoRequest._chunkSteps(filledView);\n      return;\n    }\n\n    if (controller._closeRequested) {\n      const e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n      ReadableByteStreamControllerError(controller, e);\n\n      readIntoRequest._errorSteps(e);\n      return;\n    }\n  }\n\n  controller._pendingPullIntos.push(pullIntoDescriptor);\n\n  ReadableStreamAddReadIntoRequest<T>(stream, readIntoRequest);\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nfunction ReadableByteStreamControllerRespondInClosedState(controller: ReadableByteStreamController,\n                                                          firstDescriptor: PullIntoDescriptor) {\n  assert(firstDescriptor.bytesFilled === 0);\n\n  const stream = controller._controlledReadableByteStream;\n  if (ReadableStreamHasBYOBReader(stream)) {\n    while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n      const pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);\n      ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);\n    }\n  }\n}\n\nfunction ReadableByteStreamControllerRespondInReadableState(controller: ReadableByteStreamController,\n                                                            bytesWritten: number,\n                                                            pullIntoDescriptor: PullIntoDescriptor) {\n  assert(pullIntoDescriptor.bytesFilled + bytesWritten <= pullIntoDescriptor.byteLength);\n\n  ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor);\n\n  if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {\n    return;\n  }\n\n  ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n  const remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize;\n  if (remainderSize > 0) {\n    const end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n    const remainder = ArrayBufferSlice(pullIntoDescriptor.buffer, end - remainderSize, end);\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength);\n  }\n\n  pullIntoDescriptor.bytesFilled -= remainderSize;\n  ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);\n\n  ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n}\n\nfunction ReadableByteStreamControllerRespondInternal(controller: ReadableByteStreamController, bytesWritten: number) {\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  assert(CanTransferArrayBuffer(firstDescriptor.buffer));\n\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n\n  const state = controller._controlledReadableByteStream._state;\n  if (state === 'closed') {\n    assert(bytesWritten === 0);\n    ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor);\n  } else {\n    assert(state === 'readable');\n    assert(bytesWritten > 0);\n    ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);\n  }\n\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nfunction ReadableByteStreamControllerShiftPendingPullInto(\n  controller: ReadableByteStreamController\n): PullIntoDescriptor {\n  assert(controller._byobRequest === null);\n  const descriptor = controller._pendingPullIntos.shift()!;\n  return descriptor;\n}\n\nfunction ReadableByteStreamControllerShouldCallPull(controller: ReadableByteStreamController): boolean {\n  const stream = controller._controlledReadableByteStream;\n\n  if (stream._state !== 'readable') {\n    return false;\n  }\n\n  if (controller._closeRequested) {\n    return false;\n  }\n\n  if (!controller._started) {\n    return false;\n  }\n\n  if (ReadableStreamHasDefaultReader(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    return true;\n  }\n\n  if (ReadableStreamHasBYOBReader(stream) && ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n    return true;\n  }\n\n  const desiredSize = ReadableByteStreamControllerGetDesiredSize(controller);\n  assert(desiredSize !== null);\n  if (desiredSize! > 0) {\n    return true;\n  }\n\n  return false;\n}\n\nfunction ReadableByteStreamControllerClearAlgorithms(controller: ReadableByteStreamController) {\n  controller._pullAlgorithm = undefined!;\n  controller._cancelAlgorithm = undefined!;\n}\n\n// A client of ReadableByteStreamController may use these functions directly to bypass state check.\n\nexport function ReadableByteStreamControllerClose(controller: ReadableByteStreamController) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (controller._closeRequested || stream._state !== 'readable') {\n    return;\n  }\n\n  if (controller._queueTotalSize > 0) {\n    controller._closeRequested = true;\n\n    return;\n  }\n\n  if (controller._pendingPullIntos.length > 0) {\n    const firstPendingPullInto = controller._pendingPullIntos.peek();\n    if (firstPendingPullInto.bytesFilled > 0) {\n      const e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n      ReadableByteStreamControllerError(controller, e);\n\n      throw e;\n    }\n  }\n\n  ReadableByteStreamControllerClearAlgorithms(controller);\n  ReadableStreamClose(stream);\n}\n\nexport function ReadableByteStreamControllerEnqueue(controller: ReadableByteStreamController, chunk: ArrayBufferView) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (controller._closeRequested || stream._state !== 'readable') {\n    return;\n  }\n\n  const buffer = chunk.buffer;\n  const byteOffset = chunk.byteOffset;\n  const byteLength = chunk.byteLength;\n  if (IsDetachedBuffer(buffer)) {\n    throw new TypeError('chunk\\'s buffer is detached and so cannot be enqueued');\n  }\n  const transferredBuffer = TransferArrayBuffer(buffer);\n\n  if (controller._pendingPullIntos.length > 0) {\n    const firstPendingPullInto = controller._pendingPullIntos.peek();\n    if (IsDetachedBuffer(firstPendingPullInto.buffer)) {\n      throw new TypeError(\n        'The BYOB request\\'s buffer has been detached and so cannot be filled with an enqueued chunk'\n      );\n    }\n    firstPendingPullInto.buffer = TransferArrayBuffer(firstPendingPullInto.buffer);\n  }\n\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n\n  if (ReadableStreamHasDefaultReader(stream)) {\n    if (ReadableStreamGetNumReadRequests(stream) === 0) {\n      assert(controller._pendingPullIntos.length === 0);\n      ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n    } else {\n      assert(controller._queue.length === 0);\n      if (controller._pendingPullIntos.length > 0) {\n        assert(controller._pendingPullIntos.peek().readerType === 'default');\n        ReadableByteStreamControllerShiftPendingPullInto(controller);\n      }\n      const transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength);\n      ReadableStreamFulfillReadRequest(stream, transferredView, false);\n    }\n  } else if (ReadableStreamHasBYOBReader(stream)) {\n    // TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully.\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n    ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n  } else {\n    assert(!IsReadableStreamLocked(stream));\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n  }\n\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nexport function ReadableByteStreamControllerError(controller: ReadableByteStreamController, e: any) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (stream._state !== 'readable') {\n    return;\n  }\n\n  ReadableByteStreamControllerClearPendingPullIntos(controller);\n\n  ResetQueue(controller);\n  ReadableByteStreamControllerClearAlgorithms(controller);\n  ReadableStreamError(stream, e);\n}\n\nexport function ReadableByteStreamControllerGetBYOBRequest(\n  controller: ReadableByteStreamController\n): ReadableStreamBYOBRequest | null {\n  if (controller._byobRequest === null && controller._pendingPullIntos.length > 0) {\n    const firstDescriptor = controller._pendingPullIntos.peek();\n    const view = new Uint8Array(firstDescriptor.buffer,\n                                firstDescriptor.byteOffset + firstDescriptor.bytesFilled,\n                                firstDescriptor.byteLength - firstDescriptor.bytesFilled);\n\n    const byobRequest: ReadableStreamBYOBRequest = Object.create(ReadableStreamBYOBRequest.prototype);\n    SetUpReadableStreamBYOBRequest(byobRequest, controller, view);\n    controller._byobRequest = byobRequest;\n  }\n  return controller._byobRequest;\n}\n\nfunction ReadableByteStreamControllerGetDesiredSize(controller: ReadableByteStreamController): number | null {\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'errored') {\n    return null;\n  }\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\nexport function ReadableByteStreamControllerRespond(controller: ReadableByteStreamController, bytesWritten: number) {\n  assert(controller._pendingPullIntos.length > 0);\n\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'closed') {\n    if (bytesWritten !== 0) {\n      throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream');\n    }\n  } else {\n    assert(state === 'readable');\n    if (bytesWritten === 0) {\n      throw new TypeError('bytesWritten must be greater than 0 when calling respond() on a readable stream');\n    }\n    if (firstDescriptor.bytesFilled + bytesWritten > firstDescriptor.byteLength) {\n      throw new RangeError('bytesWritten out of range');\n    }\n  }\n\n  firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer);\n\n  ReadableByteStreamControllerRespondInternal(controller, bytesWritten);\n}\n\nexport function ReadableByteStreamControllerRespondWithNewView(controller: ReadableByteStreamController,\n                                                               view: ArrayBufferView) {\n  assert(controller._pendingPullIntos.length > 0);\n  assert(!IsDetachedBuffer(view.buffer));\n\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'closed') {\n    if (view.byteLength !== 0) {\n      throw new TypeError('The view\\'s length must be 0 when calling respondWithNewView() on a closed stream');\n    }\n  } else {\n    assert(state === 'readable');\n    if (view.byteLength === 0) {\n      throw new TypeError(\n        'The view\\'s length must be greater than 0 when calling respondWithNewView() on a readable stream'\n      );\n    }\n  }\n\n  if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) {\n    throw new RangeError('The region specified by view does not match byobRequest');\n  }\n  if (firstDescriptor.bufferByteLength !== view.buffer.byteLength) {\n    throw new RangeError('The buffer of view has different capacity than byobRequest');\n  }\n  if (firstDescriptor.bytesFilled + view.byteLength > firstDescriptor.byteLength) {\n    throw new RangeError('The region specified by view is larger than byobRequest');\n  }\n\n  const viewByteLength = view.byteLength;\n  firstDescriptor.buffer = TransferArrayBuffer(view.buffer);\n  ReadableByteStreamControllerRespondInternal(controller, viewByteLength);\n}\n\nexport function SetUpReadableByteStreamController(stream: ReadableByteStream,\n                                                  controller: ReadableByteStreamController,\n                                                  startAlgorithm: () => void | PromiseLike<void>,\n                                                  pullAlgorithm: () => Promise<void>,\n                                                  cancelAlgorithm: (reason: any) => Promise<void>,\n                                                  highWaterMark: number,\n                                                  autoAllocateChunkSize: number | undefined) {\n  assert(stream._readableStreamController === undefined);\n  if (autoAllocateChunkSize !== undefined) {\n    assert(NumberIsInteger(autoAllocateChunkSize));\n    assert(autoAllocateChunkSize > 0);\n  }\n\n  controller._controlledReadableByteStream = stream;\n\n  controller._pullAgain = false;\n  controller._pulling = false;\n\n  controller._byobRequest = null;\n\n  // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n  controller._queue = controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._closeRequested = false;\n  controller._started = false;\n\n  controller._strategyHWM = highWaterMark;\n\n  controller._pullAlgorithm = pullAlgorithm;\n  controller._cancelAlgorithm = cancelAlgorithm;\n\n  controller._autoAllocateChunkSize = autoAllocateChunkSize;\n\n  controller._pendingPullIntos = new SimpleQueue();\n\n  stream._readableStreamController = controller;\n\n  const startResult = startAlgorithm();\n  uponPromise(\n    promiseResolvedWith(startResult),\n    () => {\n      controller._started = true;\n\n      assert(!controller._pulling);\n      assert(!controller._pullAgain);\n\n      ReadableByteStreamControllerCallPullIfNeeded(controller);\n    },\n    r => {\n      ReadableByteStreamControllerError(controller, r);\n    }\n  );\n}\n\nexport function SetUpReadableByteStreamControllerFromUnderlyingSource(\n  stream: ReadableByteStream,\n  underlyingByteSource: ValidatedUnderlyingByteSource,\n  highWaterMark: number\n) {\n  const controller: ReadableByteStreamController = Object.create(ReadableByteStreamController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let pullAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let cancelAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingByteSource.start !== undefined) {\n    startAlgorithm = () => underlyingByteSource.start!(controller);\n  }\n  if (underlyingByteSource.pull !== undefined) {\n    pullAlgorithm = () => underlyingByteSource.pull!(controller);\n  }\n  if (underlyingByteSource.cancel !== undefined) {\n    cancelAlgorithm = reason => underlyingByteSource.cancel!(reason);\n  }\n\n  const autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;\n  if (autoAllocateChunkSize === 0) {\n    throw new TypeError('autoAllocateChunkSize must be greater than 0');\n  }\n\n  SetUpReadableByteStreamController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize\n  );\n}\n\nfunction SetUpReadableStreamBYOBRequest(request: ReadableStreamBYOBRequest,\n                                        controller: ReadableByteStreamController,\n                                        view: ArrayBufferView) {\n  assert(IsReadableByteStreamController(controller));\n  assert(typeof view === 'object');\n  assert(ArrayBuffer.isView(view));\n  assert(!IsDetachedBuffer(view.buffer));\n  request._associatedReadableByteStreamController = controller;\n  request._view = view;\n}\n\n// Helper functions for the ReadableStreamBYOBRequest.\n\nfunction byobRequestBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamBYOBRequest.prototype.${name} can only be used on a ReadableStreamBYOBRequest`);\n}\n\n// Helper functions for the ReadableByteStreamController.\n\nfunction byteStreamControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableByteStreamController.prototype.${name} can only be used on a ReadableByteStreamController`);\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericInitialize,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport { IsReadableStreamLocked, ReadableByteStream, ReadableStream } from '../readable-stream';\nimport {\n  IsReadableByteStreamController,\n  ReadableByteStreamController,\n  ReadableByteStreamControllerPullInto\n} from './byte-stream-controller';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { newPromise, promiseRejectedWith } from '../helpers/webidl';\nimport { assertRequiredArgument } from '../validators/basic';\nimport { assertReadableStream } from '../validators/readable-stream';\nimport { IsDetachedBuffer } from '../abstract-ops/ecmascript';\n\n/**\n * A result returned by {@link ReadableStreamBYOBReader.read}.\n *\n * @public\n */\nexport type ReadableStreamBYOBReadResult<T extends ArrayBufferView> = {\n  done: false;\n  value: T;\n} | {\n  done: true;\n  value: T | undefined;\n};\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamBYOBReader(stream: ReadableByteStream): ReadableStreamBYOBReader {\n  return new ReadableStreamBYOBReader(stream);\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamAddReadIntoRequest<T extends ArrayBufferView>(stream: ReadableByteStream,\n                                                                            readIntoRequest: ReadIntoRequest<T>): void {\n  assert(IsReadableStreamBYOBReader(stream._reader));\n  assert(stream._state === 'readable' || stream._state === 'closed');\n\n  (stream._reader! as ReadableStreamBYOBReader)._readIntoRequests.push(readIntoRequest);\n}\n\nexport function ReadableStreamFulfillReadIntoRequest(stream: ReadableByteStream,\n                                                     chunk: ArrayBufferView,\n                                                     done: boolean) {\n  const reader = stream._reader as ReadableStreamBYOBReader;\n\n  assert(reader._readIntoRequests.length > 0);\n\n  const readIntoRequest = reader._readIntoRequests.shift()!;\n  if (done) {\n    readIntoRequest._closeSteps(chunk);\n  } else {\n    readIntoRequest._chunkSteps(chunk);\n  }\n}\n\nexport function ReadableStreamGetNumReadIntoRequests(stream: ReadableByteStream): number {\n  return (stream._reader as ReadableStreamBYOBReader)._readIntoRequests.length;\n}\n\nexport function ReadableStreamHasBYOBReader(stream: ReadableByteStream): boolean {\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return false;\n  }\n\n  if (!IsReadableStreamBYOBReader(reader)) {\n    return false;\n  }\n\n  return true;\n}\n\n// Readers\n\nexport interface ReadIntoRequest<T extends ArrayBufferView> {\n  _chunkSteps(chunk: T): void;\n\n  _closeSteps(chunk: T | undefined): void;\n\n  _errorSteps(e: any): void;\n}\n\n/**\n * A BYOB reader vended by a {@link ReadableStream}.\n *\n * @public\n */\nexport class ReadableStreamBYOBReader {\n  /** @internal */\n  _ownerReadableStream!: ReadableByteStream;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readIntoRequests: SimpleQueue<ReadIntoRequest<any>>;\n\n  constructor(stream: ReadableByteStream) {\n    assertRequiredArgument(stream, 1, 'ReadableStreamBYOBReader');\n    assertReadableStream(stream, 'First parameter');\n\n    if (IsReadableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n    }\n\n    if (!IsReadableByteStreamController(stream._readableStreamController)) {\n      throw new TypeError('Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte ' +\n        'source');\n    }\n\n    ReadableStreamReaderGenericInitialize(this, stream);\n\n    this._readIntoRequests = new SimpleQueue();\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or\n   * the reader's lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('cancel'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('cancel'));\n    }\n\n    return ReadableStreamReaderGenericCancel(this, reason);\n  }\n\n  /**\n   * Attempts to reads bytes into view, and returns a promise resolved with the result.\n   *\n   * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.\n   */\n  read<T extends ArrayBufferView>(view: T): Promise<ReadableStreamBYOBReadResult<T>> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('read'));\n    }\n\n    if (!ArrayBuffer.isView(view)) {\n      return promiseRejectedWith(new TypeError('view must be an array buffer view'));\n    }\n    if (view.byteLength === 0) {\n      return promiseRejectedWith(new TypeError('view must have non-zero byteLength'));\n    }\n    if (view.buffer.byteLength === 0) {\n      return promiseRejectedWith(new TypeError(`view's buffer must have non-zero byteLength`));\n    }\n    if (IsDetachedBuffer(view.buffer)) {\n      return promiseRejectedWith(new TypeError('view\\'s buffer has been detached'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('read from'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamBYOBReadResult<T>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamBYOBReadResult<T>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readIntoRequest: ReadIntoRequest<T> = {\n      _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),\n      _closeSteps: chunk => resolvePromise({ value: chunk, done: true }),\n      _errorSteps: e => rejectPromise(e)\n    };\n    ReadableStreamBYOBReaderRead(this, view, readIntoRequest);\n    return promise;\n  }\n\n  /**\n   * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.\n   * If the associated stream is errored when the lock is released, the reader will appear errored in the same way\n   * from now on; otherwise, the reader will appear closed.\n   *\n   * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by\n   * the reader's {@link ReadableStreamBYOBReader.read | read()} method has not yet been settled. Attempting to\n   * do so will throw a `TypeError` and leave the reader locked to the stream.\n   */\n  releaseLock(): void {\n    if (!IsReadableStreamBYOBReader(this)) {\n      throw byobReaderBrandCheckException('releaseLock');\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return;\n    }\n\n    if (this._readIntoRequests.length > 0) {\n      throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n    }\n\n    ReadableStreamReaderGenericRelease(this);\n  }\n}\n\nObject.defineProperties(ReadableStreamBYOBReader.prototype, {\n  cancel: { enumerable: true },\n  read: { enumerable: true },\n  releaseLock: { enumerable: true },\n  closed: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamBYOBReader.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamBYOBReader',\n    configurable: true\n  });\n}\n\n// Abstract operations for the readers.\n\nexport function IsReadableStreamBYOBReader(x: any): x is ReadableStreamBYOBReader {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readIntoRequests')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamBYOBReader;\n}\n\nexport function ReadableStreamBYOBReaderRead<T extends ArrayBufferView>(\n  reader: ReadableStreamBYOBReader,\n  view: T,\n  readIntoRequest: ReadIntoRequest<T>\n): void {\n  const stream = reader._ownerReadableStream;\n\n  assert(stream !== undefined);\n\n  stream._disturbed = true;\n\n  if (stream._state === 'errored') {\n    readIntoRequest._errorSteps(stream._storedError);\n  } else {\n    ReadableByteStreamControllerPullInto(\n      stream._readableStreamController as ReadableByteStreamController,\n      view,\n      readIntoRequest\n    );\n  }\n}\n\n// Helper functions for the ReadableStreamBYOBReader.\n\nfunction byobReaderBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamBYOBReader.prototype.${name} can only be used on a ReadableStreamBYOBReader`);\n}\n","import { QueuingStrategy, QueuingStrategySizeCallback } from '../queuing-strategy';\nimport NumberIsNaN from '../../stub/number-isnan';\n\nexport function ExtractHighWaterMark(strategy: QueuingStrategy, defaultHWM: number): number {\n  const { highWaterMark } = strategy;\n\n  if (highWaterMark === undefined) {\n    return defaultHWM;\n  }\n\n  if (NumberIsNaN(highWaterMark) || highWaterMark < 0) {\n    throw new RangeError('Invalid highWaterMark');\n  }\n\n  return highWaterMark;\n}\n\nexport function ExtractSizeAlgorithm<T>(strategy: QueuingStrategy<T>): QueuingStrategySizeCallback<T> {\n  const { size } = strategy;\n\n  if (!size) {\n    return () => 1;\n  }\n\n  return size;\n}\n","import { QueuingStrategy, QueuingStrategySizeCallback } from '../queuing-strategy';\nimport { assertDictionary, assertFunction, convertUnrestrictedDouble } from './basic';\n\nexport function convertQueuingStrategy<T>(init: QueuingStrategy<T> | null | undefined,\n                                          context: string): QueuingStrategy<T> {\n  assertDictionary(init, context);\n  const highWaterMark = init?.highWaterMark;\n  const size = init?.size;\n  return {\n    highWaterMark: highWaterMark === undefined ? undefined : convertUnrestrictedDouble(highWaterMark),\n    size: size === undefined ? undefined : convertQueuingStrategySize(size, `${context} has member 'size' that`)\n  };\n}\n\nfunction convertQueuingStrategySize<T>(fn: QueuingStrategySizeCallback<T>,\n                                       context: string): QueuingStrategySizeCallback<T> {\n  assertFunction(fn, context);\n  return chunk => convertUnrestrictedDouble(fn(chunk));\n}\n","import { assertDictionary, assertFunction } from './basic';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\nimport {\n  UnderlyingSink,\n  UnderlyingSinkAbortCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  ValidatedUnderlyingSink\n} from '../writable-stream/underlying-sink';\nimport { WritableStreamDefaultController } from '../writable-stream';\n\nexport function convertUnderlyingSink<W>(original: UnderlyingSink<W> | null,\n                                         context: string): ValidatedUnderlyingSink<W> {\n  assertDictionary(original, context);\n  const abort = original?.abort;\n  const close = original?.close;\n  const start = original?.start;\n  const type = original?.type;\n  const write = original?.write;\n  return {\n    abort: abort === undefined ?\n      undefined :\n      convertUnderlyingSinkAbortCallback(abort, original!, `${context} has member 'abort' that`),\n    close: close === undefined ?\n      undefined :\n      convertUnderlyingSinkCloseCallback(close, original!, `${context} has member 'close' that`),\n    start: start === undefined ?\n      undefined :\n      convertUnderlyingSinkStartCallback(start, original!, `${context} has member 'start' that`),\n    write: write === undefined ?\n      undefined :\n      convertUnderlyingSinkWriteCallback(write, original!, `${context} has member 'write' that`),\n    type\n  };\n}\n\nfunction convertUnderlyingSinkAbortCallback(\n  fn: UnderlyingSinkAbortCallback,\n  original: UnderlyingSink,\n  context: string\n): (reason: any) => Promise<void> {\n  assertFunction(fn, context);\n  return (reason: any) => promiseCall(fn, original, [reason]);\n}\n\nfunction convertUnderlyingSinkCloseCallback(\n  fn: UnderlyingSinkCloseCallback,\n  original: UnderlyingSink,\n  context: string\n): () => Promise<void> {\n  assertFunction(fn, context);\n  return () => promiseCall(fn, original, []);\n}\n\nfunction convertUnderlyingSinkStartCallback(\n  fn: UnderlyingSinkStartCallback,\n  original: UnderlyingSink,\n  context: string\n): UnderlyingSinkStartCallback {\n  assertFunction(fn, context);\n  return (controller: WritableStreamDefaultController) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertUnderlyingSinkWriteCallback<W>(\n  fn: UnderlyingSinkWriteCallback<W>,\n  original: UnderlyingSink<W>,\n  context: string\n): (chunk: W, controller: WritableStreamDefaultController) => Promise<void> {\n  assertFunction(fn, context);\n  return (chunk: W, controller: WritableStreamDefaultController) => promiseCall(fn, original, [chunk, controller]);\n}\n","import { IsWritableStream, WritableStream } from '../writable-stream';\n\nexport function assertWritableStream(x: unknown, context: string): asserts x is WritableStream {\n  if (!IsWritableStream(x)) {\n    throw new TypeError(`${context} is not a WritableStream.`);\n  }\n}\n","/**\n * A signal object that allows you to communicate with a request and abort it if required\n * via its associated `AbortController` object.\n *\n * @remarks\n *   This interface is compatible with the `AbortSignal` interface defined in TypeScript's DOM types.\n *   It is redefined here, so it can be polyfilled without a DOM, for example with\n *   {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.\n *\n * @public\n */\nexport interface AbortSignal {\n  /**\n   * Whether the request is aborted.\n   */\n  readonly aborted: boolean;\n\n  /**\n   * Add an event listener to be triggered when this signal becomes aborted.\n   */\n  addEventListener(type: 'abort', listener: () => void): void;\n\n  /**\n   * Remove an event listener that was previously added with {@link AbortSignal.addEventListener}.\n   */\n  removeEventListener(type: 'abort', listener: () => void): void;\n}\n\nexport function isAbortSignal(value: unknown): value is AbortSignal {\n  if (typeof value !== 'object' || value === null) {\n    return false;\n  }\n  try {\n    return typeof (value as AbortSignal).aborted === 'boolean';\n  } catch {\n    // AbortSignal.prototype.aborted throws if its brand check fails\n    return false;\n  }\n}\n\n/**\n * A controller object that allows you to abort an `AbortSignal` when desired.\n *\n * @remarks\n *   This interface is compatible with the `AbortController` interface defined in TypeScript's DOM types.\n *   It is redefined here, so it can be polyfilled without a DOM, for example with\n *   {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.\n *\n * @internal\n */\nexport interface AbortController {\n  readonly signal: AbortSignal;\n\n  abort(): void;\n}\n\ninterface AbortControllerConstructor {\n  new(): AbortController;\n}\n\nconst supportsAbortController = typeof (AbortController as any) === 'function';\n\n/**\n * Construct a new AbortController, if supported by the platform.\n *\n * @internal\n */\nexport function createAbortController(): AbortController | undefined {\n  if (supportsAbortController) {\n    return new (AbortController as AbortControllerConstructor)();\n  }\n  return undefined;\n}\n","import assert from '../stub/assert';\nimport {\n  newPromise,\n  promiseRejectedWith,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  uponPromise\n} from './helpers/webidl';\nimport {\n  DequeueValue,\n  EnqueueValueWithSize,\n  PeekQueueValue,\n  QueuePair,\n  ResetQueue\n} from './abstract-ops/queue-with-sizes';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { SimpleQueue } from './simple-queue';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { AbortSteps, ErrorSteps } from './abstract-ops/internal-methods';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport {\n  UnderlyingSink,\n  UnderlyingSinkAbortCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  ValidatedUnderlyingSink\n} from './writable-stream/underlying-sink';\nimport { assertObject, assertRequiredArgument } from './validators/basic';\nimport { convertUnderlyingSink } from './validators/underlying-sink';\nimport { assertWritableStream } from './validators/writable-stream';\nimport { AbortController, AbortSignal, createAbortController } from './abort-signal';\n\ntype WritableStreamState = 'writable' | 'closed' | 'erroring' | 'errored';\n\ninterface WriteOrCloseRequest {\n  _resolve: (value?: undefined) => void;\n  _reject: (reason: any) => void;\n}\n\ntype WriteRequest = WriteOrCloseRequest;\ntype CloseRequest = WriteOrCloseRequest;\n\ninterface PendingAbortRequest {\n  _promise: Promise<undefined>;\n  _resolve: (value?: undefined) => void;\n  _reject: (reason: any) => void;\n  _reason: any;\n  _wasAlreadyErroring: boolean;\n}\n\n/**\n * A writable stream represents a destination for data, into which you can write.\n *\n * @public\n */\nclass WritableStream<W = any> {\n  /** @internal */\n  _state!: WritableStreamState;\n  /** @internal */\n  _storedError: any;\n  /** @internal */\n  _writer: WritableStreamDefaultWriter<W> | undefined;\n  /** @internal */\n  _writableStreamController!: WritableStreamDefaultController<W>;\n  /** @internal */\n  _writeRequests!: SimpleQueue<WriteRequest>;\n  /** @internal */\n  _inFlightWriteRequest: WriteRequest | undefined;\n  /** @internal */\n  _closeRequest: CloseRequest | undefined;\n  /** @internal */\n  _inFlightCloseRequest: CloseRequest | undefined;\n  /** @internal */\n  _pendingAbortRequest: PendingAbortRequest | undefined;\n  /** @internal */\n  _backpressure!: boolean;\n\n  constructor(underlyingSink?: UnderlyingSink<W>, strategy?: QueuingStrategy<W>);\n  constructor(rawUnderlyingSink: UnderlyingSink<W> | null | undefined = {},\n              rawStrategy: QueuingStrategy<W> | null | undefined = {}) {\n    if (rawUnderlyingSink === undefined) {\n      rawUnderlyingSink = null;\n    } else {\n      assertObject(rawUnderlyingSink, 'First parameter');\n    }\n\n    const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');\n    const underlyingSink = convertUnderlyingSink(rawUnderlyingSink, 'First parameter');\n\n    InitializeWritableStream(this);\n\n    const type = underlyingSink.type;\n    if (type !== undefined) {\n      throw new RangeError('Invalid type is specified');\n    }\n\n    const sizeAlgorithm = ExtractSizeAlgorithm(strategy);\n    const highWaterMark = ExtractHighWaterMark(strategy, 1);\n\n    SetUpWritableStreamDefaultControllerFromUnderlyingSink(this, underlyingSink, highWaterMark, sizeAlgorithm);\n  }\n\n  /**\n   * Returns whether or not the writable stream is locked to a writer.\n   */\n  get locked(): boolean {\n    if (!IsWritableStream(this)) {\n      throw streamBrandCheckException('locked');\n    }\n\n    return IsWritableStreamLocked(this);\n  }\n\n  /**\n   * Aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be\n   * immediately moved to an errored state, with any queued-up writes discarded. This will also execute any abort\n   * mechanism of the underlying sink.\n   *\n   * The returned promise will fulfill if the stream shuts down successfully, or reject if the underlying sink signaled\n   * that there was an error doing so. Additionally, it will reject with a `TypeError` (without attempting to cancel\n   * the stream) if the stream is currently locked.\n   */\n  abort(reason: any = undefined): Promise<void> {\n    if (!IsWritableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('abort'));\n    }\n\n    if (IsWritableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot abort a stream that already has a writer'));\n    }\n\n    return WritableStreamAbort(this, reason);\n  }\n\n  /**\n   * Closes the stream. The underlying sink will finish processing any previously-written chunks, before invoking its\n   * close behavior. During this time any further attempts to write will fail (without erroring the stream).\n   *\n   * The method returns a promise that will fulfill if all remaining chunks are successfully written and the stream\n   * successfully closes, or rejects if an error is encountered during this process. Additionally, it will reject with\n   * a `TypeError` (without attempting to cancel the stream) if the stream is currently locked.\n   */\n  close() {\n    if (!IsWritableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('close'));\n    }\n\n    if (IsWritableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot close a stream that already has a writer'));\n    }\n\n    if (WritableStreamCloseQueuedOrInFlight(this)) {\n      return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));\n    }\n\n    return WritableStreamClose(this);\n  }\n\n  /**\n   * Creates a {@link WritableStreamDefaultWriter | writer} and locks the stream to the new writer. While the stream\n   * is locked, no other writer can be acquired until this one is released.\n   *\n   * This functionality is especially useful for creating abstractions that desire the ability to write to a stream\n   * without interruption or interleaving. By getting a writer for the stream, you can ensure nobody else can write at\n   * the same time, which would cause the resulting written data to be unpredictable and probably useless.\n   */\n  getWriter(): WritableStreamDefaultWriter<W> {\n    if (!IsWritableStream(this)) {\n      throw streamBrandCheckException('getWriter');\n    }\n\n    return AcquireWritableStreamDefaultWriter(this);\n  }\n}\n\nObject.defineProperties(WritableStream.prototype, {\n  abort: { enumerable: true },\n  close: { enumerable: true },\n  getWriter: { enumerable: true },\n  locked: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStream.prototype, Symbol.toStringTag, {\n    value: 'WritableStream',\n    configurable: true\n  });\n}\n\nexport {\n  AcquireWritableStreamDefaultWriter,\n  CreateWritableStream,\n  IsWritableStream,\n  IsWritableStreamLocked,\n  WritableStream,\n  WritableStreamAbort,\n  WritableStreamDefaultControllerErrorIfNeeded,\n  WritableStreamDefaultWriterCloseWithErrorPropagation,\n  WritableStreamDefaultWriterRelease,\n  WritableStreamDefaultWriterWrite,\n  WritableStreamCloseQueuedOrInFlight,\n  UnderlyingSink,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkAbortCallback\n};\n\n// Abstract operations for the WritableStream.\n\nfunction AcquireWritableStreamDefaultWriter<W>(stream: WritableStream<W>): WritableStreamDefaultWriter<W> {\n  return new WritableStreamDefaultWriter(stream);\n}\n\n// Throws if and only if startAlgorithm throws.\nfunction CreateWritableStream<W>(startAlgorithm: () => void | PromiseLike<void>,\n                                 writeAlgorithm: (chunk: W) => Promise<void>,\n                                 closeAlgorithm: () => Promise<void>,\n                                 abortAlgorithm: (reason: any) => Promise<void>,\n                                 highWaterMark = 1,\n                                 sizeAlgorithm: QueuingStrategySizeCallback<W> = () => 1) {\n  assert(IsNonNegativeNumber(highWaterMark));\n\n  const stream: WritableStream<W> = Object.create(WritableStream.prototype);\n  InitializeWritableStream(stream);\n\n  const controller: WritableStreamDefaultController<W> = Object.create(WritableStreamDefaultController.prototype);\n\n  SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm,\n                                       abortAlgorithm, highWaterMark, sizeAlgorithm);\n  return stream;\n}\n\nfunction InitializeWritableStream<W>(stream: WritableStream<W>) {\n  stream._state = 'writable';\n\n  // The error that will be reported by new method calls once the state becomes errored. Only set when [[state]] is\n  // 'erroring' or 'errored'. May be set to an undefined value.\n  stream._storedError = undefined;\n\n  stream._writer = undefined;\n\n  // Initialize to undefined first because the constructor of the controller checks this\n  // variable to validate the caller.\n  stream._writableStreamController = undefined!;\n\n  // This queue is placed here instead of the writer class in order to allow for passing a writer to the next data\n  // producer without waiting for the queued writes to finish.\n  stream._writeRequests = new SimpleQueue();\n\n  // Write requests are removed from _writeRequests when write() is called on the underlying sink. This prevents\n  // them from being erroneously rejected on error. If a write() call is in-flight, the request is stored here.\n  stream._inFlightWriteRequest = undefined;\n\n  // The promise that was returned from writer.close(). Stored here because it may be fulfilled after the writer\n  // has been detached.\n  stream._closeRequest = undefined;\n\n  // Close request is removed from _closeRequest when close() is called on the underlying sink. This prevents it\n  // from being erroneously rejected on error. If a close() call is in-flight, the request is stored here.\n  stream._inFlightCloseRequest = undefined;\n\n  // The promise that was returned from writer.abort(). This may also be fulfilled after the writer has detached.\n  stream._pendingAbortRequest = undefined;\n\n  // The backpressure signal set by the controller.\n  stream._backpressure = false;\n}\n\nfunction IsWritableStream(x: unknown): x is WritableStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_writableStreamController')) {\n    return false;\n  }\n\n  return x instanceof WritableStream;\n}\n\nfunction IsWritableStreamLocked(stream: WritableStream): boolean {\n  assert(IsWritableStream(stream));\n\n  if (stream._writer === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamAbort(stream: WritableStream, reason: any): Promise<undefined> {\n  if (stream._state === 'closed' || stream._state === 'errored') {\n    return promiseResolvedWith(undefined);\n  }\n  stream._writableStreamController._abortReason = reason;\n  stream._writableStreamController._abortController?.abort();\n\n  // TypeScript narrows the type of `stream._state` down to 'writable' | 'erroring',\n  // but it doesn't know that signaling abort runs author code that might have changed the state.\n  // Widen the type again by casting to WritableStreamState.\n  const state = stream._state as WritableStreamState;\n\n  if (state === 'closed' || state === 'errored') {\n    return promiseResolvedWith(undefined);\n  }\n  if (stream._pendingAbortRequest !== undefined) {\n    return stream._pendingAbortRequest._promise;\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n\n  let wasAlreadyErroring = false;\n  if (state === 'erroring') {\n    wasAlreadyErroring = true;\n    // reason will not be used, so don't keep a reference to it.\n    reason = undefined;\n  }\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    stream._pendingAbortRequest = {\n      _promise: undefined!,\n      _resolve: resolve,\n      _reject: reject,\n      _reason: reason,\n      _wasAlreadyErroring: wasAlreadyErroring\n    };\n  });\n  stream._pendingAbortRequest!._promise = promise;\n\n  if (!wasAlreadyErroring) {\n    WritableStreamStartErroring(stream, reason);\n  }\n\n  return promise;\n}\n\nfunction WritableStreamClose(stream: WritableStream<any>): Promise<undefined> {\n  const state = stream._state;\n  if (state === 'closed' || state === 'errored') {\n    return promiseRejectedWith(new TypeError(\n      `The stream (in ${state} state) is not in the writable state and cannot be closed`));\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n  assert(!WritableStreamCloseQueuedOrInFlight(stream));\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    const closeRequest: CloseRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._closeRequest = closeRequest;\n  });\n\n  const writer = stream._writer;\n  if (writer !== undefined && stream._backpressure && state === 'writable') {\n    defaultWriterReadyPromiseResolve(writer);\n  }\n\n  WritableStreamDefaultControllerClose(stream._writableStreamController);\n\n  return promise;\n}\n\n// WritableStream API exposed for controllers.\n\nfunction WritableStreamAddWriteRequest(stream: WritableStream): Promise<undefined> {\n  assert(IsWritableStreamLocked(stream));\n  assert(stream._state === 'writable');\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    const writeRequest: WriteRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._writeRequests.push(writeRequest);\n  });\n\n  return promise;\n}\n\nfunction WritableStreamDealWithRejection(stream: WritableStream, error: any) {\n  const state = stream._state;\n\n  if (state === 'writable') {\n    WritableStreamStartErroring(stream, error);\n    return;\n  }\n\n  assert(state === 'erroring');\n  WritableStreamFinishErroring(stream);\n}\n\nfunction WritableStreamStartErroring(stream: WritableStream, reason: any) {\n  assert(stream._storedError === undefined);\n  assert(stream._state === 'writable');\n\n  const controller = stream._writableStreamController;\n  assert(controller !== undefined);\n\n  stream._state = 'erroring';\n  stream._storedError = reason;\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);\n  }\n\n  if (!WritableStreamHasOperationMarkedInFlight(stream) && controller._started) {\n    WritableStreamFinishErroring(stream);\n  }\n}\n\nfunction WritableStreamFinishErroring(stream: WritableStream) {\n  assert(stream._state === 'erroring');\n  assert(!WritableStreamHasOperationMarkedInFlight(stream));\n  stream._state = 'errored';\n  stream._writableStreamController[ErrorSteps]();\n\n  const storedError = stream._storedError;\n  stream._writeRequests.forEach(writeRequest => {\n    writeRequest._reject(storedError);\n  });\n  stream._writeRequests = new SimpleQueue();\n\n  if (stream._pendingAbortRequest === undefined) {\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    return;\n  }\n\n  const abortRequest = stream._pendingAbortRequest;\n  stream._pendingAbortRequest = undefined;\n\n  if (abortRequest._wasAlreadyErroring) {\n    abortRequest._reject(storedError);\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    return;\n  }\n\n  const promise = stream._writableStreamController[AbortSteps](abortRequest._reason);\n  uponPromise(\n    promise,\n    () => {\n      abortRequest._resolve();\n      WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    },\n    (reason: any) => {\n      abortRequest._reject(reason);\n      WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    });\n}\n\nfunction WritableStreamFinishInFlightWrite(stream: WritableStream) {\n  assert(stream._inFlightWriteRequest !== undefined);\n  stream._inFlightWriteRequest!._resolve(undefined);\n  stream._inFlightWriteRequest = undefined;\n}\n\nfunction WritableStreamFinishInFlightWriteWithError(stream: WritableStream, error: any) {\n  assert(stream._inFlightWriteRequest !== undefined);\n  stream._inFlightWriteRequest!._reject(error);\n  stream._inFlightWriteRequest = undefined;\n\n  assert(stream._state === 'writable' || stream._state === 'erroring');\n\n  WritableStreamDealWithRejection(stream, error);\n}\n\nfunction WritableStreamFinishInFlightClose(stream: WritableStream) {\n  assert(stream._inFlightCloseRequest !== undefined);\n  stream._inFlightCloseRequest!._resolve(undefined);\n  stream._inFlightCloseRequest = undefined;\n\n  const state = stream._state;\n\n  assert(state === 'writable' || state === 'erroring');\n\n  if (state === 'erroring') {\n    // The error was too late to do anything, so it is ignored.\n    stream._storedError = undefined;\n    if (stream._pendingAbortRequest !== undefined) {\n      stream._pendingAbortRequest._resolve();\n      stream._pendingAbortRequest = undefined;\n    }\n  }\n\n  stream._state = 'closed';\n\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    defaultWriterClosedPromiseResolve(writer);\n  }\n\n  assert(stream._pendingAbortRequest === undefined);\n  assert(stream._storedError === undefined);\n}\n\nfunction WritableStreamFinishInFlightCloseWithError(stream: WritableStream, error: any) {\n  assert(stream._inFlightCloseRequest !== undefined);\n  stream._inFlightCloseRequest!._reject(error);\n  stream._inFlightCloseRequest = undefined;\n\n  assert(stream._state === 'writable' || stream._state === 'erroring');\n\n  // Never execute sink abort() after sink close().\n  if (stream._pendingAbortRequest !== undefined) {\n    stream._pendingAbortRequest._reject(error);\n    stream._pendingAbortRequest = undefined;\n  }\n  WritableStreamDealWithRejection(stream, error);\n}\n\n// TODO(ricea): Fix alphabetical order.\nfunction WritableStreamCloseQueuedOrInFlight(stream: WritableStream): boolean {\n  if (stream._closeRequest === undefined && stream._inFlightCloseRequest === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamHasOperationMarkedInFlight(stream: WritableStream): boolean {\n  if (stream._inFlightWriteRequest === undefined && stream._inFlightCloseRequest === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamMarkCloseRequestInFlight(stream: WritableStream) {\n  assert(stream._inFlightCloseRequest === undefined);\n  assert(stream._closeRequest !== undefined);\n  stream._inFlightCloseRequest = stream._closeRequest;\n  stream._closeRequest = undefined;\n}\n\nfunction WritableStreamMarkFirstWriteRequestInFlight(stream: WritableStream) {\n  assert(stream._inFlightWriteRequest === undefined);\n  assert(stream._writeRequests.length !== 0);\n  stream._inFlightWriteRequest = stream._writeRequests.shift();\n}\n\nfunction WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream: WritableStream) {\n  assert(stream._state === 'errored');\n  if (stream._closeRequest !== undefined) {\n    assert(stream._inFlightCloseRequest === undefined);\n\n    stream._closeRequest._reject(stream._storedError);\n    stream._closeRequest = undefined;\n  }\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    defaultWriterClosedPromiseReject(writer, stream._storedError);\n  }\n}\n\nfunction WritableStreamUpdateBackpressure(stream: WritableStream, backpressure: boolean) {\n  assert(stream._state === 'writable');\n  assert(!WritableStreamCloseQueuedOrInFlight(stream));\n\n  const writer = stream._writer;\n  if (writer !== undefined && backpressure !== stream._backpressure) {\n    if (backpressure) {\n      defaultWriterReadyPromiseReset(writer);\n    } else {\n      assert(!backpressure);\n\n      defaultWriterReadyPromiseResolve(writer);\n    }\n  }\n\n  stream._backpressure = backpressure;\n}\n\n/**\n * A default writer vended by a {@link WritableStream}.\n *\n * @public\n */\nexport class WritableStreamDefaultWriter<W = any> {\n  /** @internal */\n  _ownerWritableStream: WritableStream<W>;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _closedPromiseState!: 'pending' | 'resolved' | 'rejected';\n  /** @internal */\n  _readyPromise!: Promise<undefined>;\n  /** @internal */\n  _readyPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _readyPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readyPromiseState!: 'pending' | 'fulfilled' | 'rejected';\n\n  constructor(stream: WritableStream<W>) {\n    assertRequiredArgument(stream, 1, 'WritableStreamDefaultWriter');\n    assertWritableStream(stream, 'First parameter');\n\n    if (IsWritableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive writing by another writer');\n    }\n\n    this._ownerWritableStream = stream;\n    stream._writer = this;\n\n    const state = stream._state;\n\n    if (state === 'writable') {\n      if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._backpressure) {\n        defaultWriterReadyPromiseInitialize(this);\n      } else {\n        defaultWriterReadyPromiseInitializeAsResolved(this);\n      }\n\n      defaultWriterClosedPromiseInitialize(this);\n    } else if (state === 'erroring') {\n      defaultWriterReadyPromiseInitializeAsRejected(this, stream._storedError);\n      defaultWriterClosedPromiseInitialize(this);\n    } else if (state === 'closed') {\n      defaultWriterReadyPromiseInitializeAsResolved(this);\n      defaultWriterClosedPromiseInitializeAsResolved(this);\n    } else {\n      assert(state === 'errored');\n\n      const storedError = stream._storedError;\n      defaultWriterReadyPromiseInitializeAsRejected(this, storedError);\n      defaultWriterClosedPromiseInitializeAsRejected(this, storedError);\n    }\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or\n   * the writer’s lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * Returns the desired size to fill the stream’s internal queue. It can be negative, if the queue is over-full.\n   * A producer can use this information to determine the right amount of data to write.\n   *\n   * It will be `null` if the stream cannot be successfully written to (due to either being errored, or having an abort\n   * queued up). It will return zero if the stream is closed. And the getter will throw an exception if invoked when\n   * the writer’s lock is released.\n   */\n  get desiredSize(): number | null {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      throw defaultWriterBrandCheckException('desiredSize');\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      throw defaultWriterLockException('desiredSize');\n    }\n\n    return WritableStreamDefaultWriterGetDesiredSize(this);\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the desired size to fill the stream’s internal queue transitions\n   * from non-positive to positive, signaling that it is no longer applying backpressure. Once the desired size dips\n   * back to zero or below, the getter will return a new promise that stays pending until the next transition.\n   *\n   * If the stream becomes errored or aborted, or the writer’s lock is released, the returned promise will become\n   * rejected.\n   */\n  get ready(): Promise<undefined> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('ready'));\n    }\n\n    return this._readyPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link WritableStream.abort | stream.abort(reason)}.\n   */\n  abort(reason: any = undefined): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('abort'));\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('abort'));\n    }\n\n    return WritableStreamDefaultWriterAbort(this, reason);\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link WritableStream.close | stream.close()}.\n   */\n  close(): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('close'));\n    }\n\n    const stream = this._ownerWritableStream;\n\n    if (stream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('close'));\n    }\n\n    if (WritableStreamCloseQueuedOrInFlight(stream)) {\n      return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));\n    }\n\n    return WritableStreamDefaultWriterClose(this);\n  }\n\n  /**\n   * Releases the writer’s lock on the corresponding stream. After the lock is released, the writer is no longer active.\n   * If the associated stream is errored when the lock is released, the writer will appear errored in the same way from\n   * now on; otherwise, the writer will appear closed.\n   *\n   * Note that the lock can still be released even if some ongoing writes have not yet finished (i.e. even if the\n   * promises returned from previous calls to {@link WritableStreamDefaultWriter.write | write()} have not yet settled).\n   * It’s not necessary to hold the lock on the writer for the duration of the write; the lock instead simply prevents\n   * other producers from writing in an interleaved manner.\n   */\n  releaseLock(): void {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      throw defaultWriterBrandCheckException('releaseLock');\n    }\n\n    const stream = this._ownerWritableStream;\n\n    if (stream === undefined) {\n      return;\n    }\n\n    assert(stream._writer !== undefined);\n\n    WritableStreamDefaultWriterRelease(this);\n  }\n\n  /**\n   * Writes the given chunk to the writable stream, by waiting until any previous writes have finished successfully,\n   * and then sending the chunk to the underlying sink's {@link UnderlyingSink.write | write()} method. It will return\n   * a promise that fulfills with undefined upon a successful write, or rejects if the write fails or stream becomes\n   * errored before the writing process is initiated.\n   *\n   * Note that what \"success\" means is up to the underlying sink; it might indicate simply that the chunk has been\n   * accepted, and not necessarily that it is safely saved to its ultimate destination.\n   */\n  write(chunk: W): Promise<void>;\n  write(chunk: W = undefined!): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('write'));\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('write to'));\n    }\n\n    return WritableStreamDefaultWriterWrite(this, chunk);\n  }\n}\n\nObject.defineProperties(WritableStreamDefaultWriter.prototype, {\n  abort: { enumerable: true },\n  close: { enumerable: true },\n  releaseLock: { enumerable: true },\n  write: { enumerable: true },\n  closed: { enumerable: true },\n  desiredSize: { enumerable: true },\n  ready: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStreamDefaultWriter.prototype, Symbol.toStringTag, {\n    value: 'WritableStreamDefaultWriter',\n    configurable: true\n  });\n}\n\n// Abstract operations for the WritableStreamDefaultWriter.\n\nfunction IsWritableStreamDefaultWriter<W = any>(x: any): x is WritableStreamDefaultWriter<W> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) {\n    return false;\n  }\n\n  return x instanceof WritableStreamDefaultWriter;\n}\n\n// A client of WritableStreamDefaultWriter may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultWriterAbort(writer: WritableStreamDefaultWriter, reason: any) {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  return WritableStreamAbort(stream, reason);\n}\n\nfunction WritableStreamDefaultWriterClose(writer: WritableStreamDefaultWriter): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  return WritableStreamClose(stream);\n}\n\nfunction WritableStreamDefaultWriterCloseWithErrorPropagation(writer: WritableStreamDefaultWriter): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  const state = stream._state;\n  if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {\n    return promiseResolvedWith(undefined);\n  }\n\n  if (state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n\n  return WritableStreamDefaultWriterClose(writer);\n}\n\nfunction WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer: WritableStreamDefaultWriter, error: any) {\n  if (writer._closedPromiseState === 'pending') {\n    defaultWriterClosedPromiseReject(writer, error);\n  } else {\n    defaultWriterClosedPromiseResetToRejected(writer, error);\n  }\n}\n\nfunction WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer: WritableStreamDefaultWriter, error: any) {\n  if (writer._readyPromiseState === 'pending') {\n    defaultWriterReadyPromiseReject(writer, error);\n  } else {\n    defaultWriterReadyPromiseResetToRejected(writer, error);\n  }\n}\n\nfunction WritableStreamDefaultWriterGetDesiredSize(writer: WritableStreamDefaultWriter): number | null {\n  const stream = writer._ownerWritableStream;\n  const state = stream._state;\n\n  if (state === 'errored' || state === 'erroring') {\n    return null;\n  }\n\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return WritableStreamDefaultControllerGetDesiredSize(stream._writableStreamController);\n}\n\nfunction WritableStreamDefaultWriterRelease(writer: WritableStreamDefaultWriter) {\n  const stream = writer._ownerWritableStream;\n  assert(stream !== undefined);\n  assert(stream._writer === writer);\n\n  const releasedError = new TypeError(\n    `Writer was released and can no longer be used to monitor the stream's closedness`);\n\n  WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, releasedError);\n\n  // The state transitions to \"errored\" before the sink abort() method runs, but the writer.closed promise is not\n  // rejected until afterwards. This means that simply testing state will not work.\n  WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, releasedError);\n\n  stream._writer = undefined;\n  writer._ownerWritableStream = undefined!;\n}\n\nfunction WritableStreamDefaultWriterWrite<W>(writer: WritableStreamDefaultWriter<W>, chunk: W): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  const controller = stream._writableStreamController;\n\n  const chunkSize = WritableStreamDefaultControllerGetChunkSize(controller, chunk);\n\n  if (stream !== writer._ownerWritableStream) {\n    return promiseRejectedWith(defaultWriterLockException('write to'));\n  }\n\n  const state = stream._state;\n  if (state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n  if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {\n    return promiseRejectedWith(new TypeError('The stream is closing or closed and cannot be written to'));\n  }\n  if (state === 'erroring') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  assert(state === 'writable');\n\n  const promise = WritableStreamAddWriteRequest(stream);\n\n  WritableStreamDefaultControllerWrite(controller, chunk, chunkSize);\n\n  return promise;\n}\n\nconst closeSentinel: unique symbol = {} as any;\n\ntype QueueRecord<W> = W | typeof closeSentinel;\n\n/**\n * Allows control of a {@link WritableStream | writable stream}'s state and internal queue.\n *\n * @public\n */\nexport class WritableStreamDefaultController<W = any> {\n  /** @internal */\n  _controlledWritableStream!: WritableStream<W>;\n  /** @internal */\n  _queue!: SimpleQueue<QueuePair<QueueRecord<W>>>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _abortReason: any;\n  /** @internal */\n  _abortController: AbortController | undefined;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _strategySizeAlgorithm!: QueuingStrategySizeCallback<W>;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _writeAlgorithm!: (chunk: W) => Promise<void>;\n  /** @internal */\n  _closeAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _abortAlgorithm!: (reason: any) => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * The reason which was passed to `WritableStream.abort(reason)` when the stream was aborted.\n   *\n   * @deprecated\n   *  This property has been removed from the specification, see https://github.com/whatwg/streams/pull/1177.\n   *  Use {@link WritableStreamDefaultController.signal}'s `reason` instead.\n   */\n  get abortReason(): any {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('abortReason');\n    }\n    return this._abortReason;\n  }\n\n  /**\n   * An `AbortSignal` that can be used to abort the pending write or close operation when the stream is aborted.\n   */\n  get signal(): AbortSignal {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('signal');\n    }\n    if (this._abortController === undefined) {\n      // Older browsers or older Node versions may not support `AbortController` or `AbortSignal`.\n      // We don't want to bundle and ship an `AbortController` polyfill together with our polyfill,\n      // so instead we only implement support for `signal` if we find a global `AbortController` constructor.\n      throw new TypeError('WritableStreamDefaultController.prototype.signal is not supported');\n    }\n    return this._abortController.signal;\n  }\n\n  /**\n   * Closes the controlled writable stream, making all future interactions with it fail with the given error `e`.\n   *\n   * This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying\n   * sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the\n   * normal lifecycle of interactions with the underlying sink.\n   */\n  error(e: any = undefined): void {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n    const state = this._controlledWritableStream._state;\n    if (state !== 'writable') {\n      // The stream is closed, errored or will be soon. The sink can't do anything useful if it gets an error here, so\n      // just treat it as a no-op.\n      return;\n    }\n\n    WritableStreamDefaultControllerError(this, e);\n  }\n\n  /** @internal */\n  [AbortSteps](reason: any): Promise<void> {\n    const result = this._abortAlgorithm(reason);\n    WritableStreamDefaultControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [ErrorSteps]() {\n    ResetQueue(this);\n  }\n}\n\nObject.defineProperties(WritableStreamDefaultController.prototype, {\n  abortReason: { enumerable: true },\n  signal: { enumerable: true },\n  error: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'WritableStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Abstract operations implementing interface required by the WritableStream.\n\nfunction IsWritableStreamDefaultController(x: any): x is WritableStreamDefaultController<any> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledWritableStream')) {\n    return false;\n  }\n\n  return x instanceof WritableStreamDefaultController;\n}\n\nfunction SetUpWritableStreamDefaultController<W>(stream: WritableStream<W>,\n                                                 controller: WritableStreamDefaultController<W>,\n                                                 startAlgorithm: () => void | PromiseLike<void>,\n                                                 writeAlgorithm: (chunk: W) => Promise<void>,\n                                                 closeAlgorithm: () => Promise<void>,\n                                                 abortAlgorithm: (reason: any) => Promise<void>,\n                                                 highWaterMark: number,\n                                                 sizeAlgorithm: QueuingStrategySizeCallback<W>) {\n  assert(IsWritableStream(stream));\n  assert(stream._writableStreamController === undefined);\n\n  controller._controlledWritableStream = stream;\n  stream._writableStreamController = controller;\n\n  // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n  controller._queue = undefined!;\n  controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._abortReason = undefined;\n  controller._abortController = createAbortController();\n  controller._started = false;\n\n  controller._strategySizeAlgorithm = sizeAlgorithm;\n  controller._strategyHWM = highWaterMark;\n\n  controller._writeAlgorithm = writeAlgorithm;\n  controller._closeAlgorithm = closeAlgorithm;\n  controller._abortAlgorithm = abortAlgorithm;\n\n  const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n  WritableStreamUpdateBackpressure(stream, backpressure);\n\n  const startResult = startAlgorithm();\n  const startPromise = promiseResolvedWith(startResult);\n  uponPromise(\n    startPromise,\n    () => {\n      assert(stream._state === 'writable' || stream._state === 'erroring');\n      controller._started = true;\n      WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n    },\n    r => {\n      assert(stream._state === 'writable' || stream._state === 'erroring');\n      controller._started = true;\n      WritableStreamDealWithRejection(stream, r);\n    }\n  );\n}\n\nfunction SetUpWritableStreamDefaultControllerFromUnderlyingSink<W>(stream: WritableStream<W>,\n                                                                   underlyingSink: ValidatedUnderlyingSink<W>,\n                                                                   highWaterMark: number,\n                                                                   sizeAlgorithm: QueuingStrategySizeCallback<W>) {\n  const controller = Object.create(WritableStreamDefaultController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let writeAlgorithm: (chunk: W) => Promise<void> = () => promiseResolvedWith(undefined);\n  let closeAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let abortAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingSink.start !== undefined) {\n    startAlgorithm = () => underlyingSink.start!(controller);\n  }\n  if (underlyingSink.write !== undefined) {\n    writeAlgorithm = chunk => underlyingSink.write!(chunk, controller);\n  }\n  if (underlyingSink.close !== undefined) {\n    closeAlgorithm = () => underlyingSink.close!();\n  }\n  if (underlyingSink.abort !== undefined) {\n    abortAlgorithm = reason => underlyingSink.abort!(reason);\n  }\n\n  SetUpWritableStreamDefaultController(\n    stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm\n  );\n}\n\n// ClearAlgorithms may be called twice. Erroring the same stream in multiple ways will often result in redundant calls.\nfunction WritableStreamDefaultControllerClearAlgorithms(controller: WritableStreamDefaultController<any>) {\n  controller._writeAlgorithm = undefined!;\n  controller._closeAlgorithm = undefined!;\n  controller._abortAlgorithm = undefined!;\n  controller._strategySizeAlgorithm = undefined!;\n}\n\nfunction WritableStreamDefaultControllerClose<W>(controller: WritableStreamDefaultController<W>) {\n  EnqueueValueWithSize(controller, closeSentinel, 0);\n  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\nfunction WritableStreamDefaultControllerGetChunkSize<W>(controller: WritableStreamDefaultController<W>,\n                                                        chunk: W): number {\n  try {\n    return controller._strategySizeAlgorithm(chunk);\n  } catch (chunkSizeE) {\n    WritableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE);\n    return 1;\n  }\n}\n\nfunction WritableStreamDefaultControllerGetDesiredSize(controller: WritableStreamDefaultController<any>): number {\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\nfunction WritableStreamDefaultControllerWrite<W>(controller: WritableStreamDefaultController<W>,\n                                                 chunk: W,\n                                                 chunkSize: number) {\n  try {\n    EnqueueValueWithSize(controller, chunk, chunkSize);\n  } catch (enqueueE) {\n    WritableStreamDefaultControllerErrorIfNeeded(controller, enqueueE);\n    return;\n  }\n\n  const stream = controller._controlledWritableStream;\n  if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._state === 'writable') {\n    const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n    WritableStreamUpdateBackpressure(stream, backpressure);\n  }\n\n  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\n// Abstract operations for the WritableStreamDefaultController.\n\nfunction WritableStreamDefaultControllerAdvanceQueueIfNeeded<W>(controller: WritableStreamDefaultController<W>) {\n  const stream = controller._controlledWritableStream;\n\n  if (!controller._started) {\n    return;\n  }\n\n  if (stream._inFlightWriteRequest !== undefined) {\n    return;\n  }\n\n  const state = stream._state;\n  assert(state !== 'closed' && state !== 'errored');\n  if (state === 'erroring') {\n    WritableStreamFinishErroring(stream);\n    return;\n  }\n\n  if (controller._queue.length === 0) {\n    return;\n  }\n\n  const value = PeekQueueValue(controller);\n  if (value === closeSentinel) {\n    WritableStreamDefaultControllerProcessClose(controller);\n  } else {\n    WritableStreamDefaultControllerProcessWrite(controller, value);\n  }\n}\n\nfunction WritableStreamDefaultControllerErrorIfNeeded(controller: WritableStreamDefaultController<any>, error: any) {\n  if (controller._controlledWritableStream._state === 'writable') {\n    WritableStreamDefaultControllerError(controller, error);\n  }\n}\n\nfunction WritableStreamDefaultControllerProcessClose(controller: WritableStreamDefaultController<any>) {\n  const stream = controller._controlledWritableStream;\n\n  WritableStreamMarkCloseRequestInFlight(stream);\n\n  DequeueValue(controller);\n  assert(controller._queue.length === 0);\n\n  const sinkClosePromise = controller._closeAlgorithm();\n  WritableStreamDefaultControllerClearAlgorithms(controller);\n  uponPromise(\n    sinkClosePromise,\n    () => {\n      WritableStreamFinishInFlightClose(stream);\n    },\n    reason => {\n      WritableStreamFinishInFlightCloseWithError(stream, reason);\n    }\n  );\n}\n\nfunction WritableStreamDefaultControllerProcessWrite<W>(controller: WritableStreamDefaultController<W>, chunk: W) {\n  const stream = controller._controlledWritableStream;\n\n  WritableStreamMarkFirstWriteRequestInFlight(stream);\n\n  const sinkWritePromise = controller._writeAlgorithm(chunk);\n  uponPromise(\n    sinkWritePromise,\n    () => {\n      WritableStreamFinishInFlightWrite(stream);\n\n      const state = stream._state;\n      assert(state === 'writable' || state === 'erroring');\n\n      DequeueValue(controller);\n\n      if (!WritableStreamCloseQueuedOrInFlight(stream) && state === 'writable') {\n        const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n        WritableStreamUpdateBackpressure(stream, backpressure);\n      }\n\n      WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n    },\n    reason => {\n      if (stream._state === 'writable') {\n        WritableStreamDefaultControllerClearAlgorithms(controller);\n      }\n      WritableStreamFinishInFlightWriteWithError(stream, reason);\n    }\n  );\n}\n\nfunction WritableStreamDefaultControllerGetBackpressure(controller: WritableStreamDefaultController<any>): boolean {\n  const desiredSize = WritableStreamDefaultControllerGetDesiredSize(controller);\n  return desiredSize <= 0;\n}\n\n// A client of WritableStreamDefaultController may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultControllerError(controller: WritableStreamDefaultController<any>, error: any) {\n  const stream = controller._controlledWritableStream;\n\n  assert(stream._state === 'writable');\n\n  WritableStreamDefaultControllerClearAlgorithms(controller);\n  WritableStreamStartErroring(stream, error);\n}\n\n// Helper functions for the WritableStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(`WritableStream.prototype.${name} can only be used on a WritableStream`);\n}\n\n// Helper functions for the WritableStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `WritableStreamDefaultController.prototype.${name} can only be used on a WritableStreamDefaultController`);\n}\n\n\n// Helper functions for the WritableStreamDefaultWriter.\n\nfunction defaultWriterBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `WritableStreamDefaultWriter.prototype.${name} can only be used on a WritableStreamDefaultWriter`);\n}\n\nfunction defaultWriterLockException(name: string): TypeError {\n  return new TypeError('Cannot ' + name + ' a stream using a released writer');\n}\n\nfunction defaultWriterClosedPromiseInitialize(writer: WritableStreamDefaultWriter) {\n  writer._closedPromise = newPromise((resolve, reject) => {\n    writer._closedPromise_resolve = resolve;\n    writer._closedPromise_reject = reject;\n    writer._closedPromiseState = 'pending';\n  });\n}\n\nfunction defaultWriterClosedPromiseInitializeAsRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  defaultWriterClosedPromiseInitialize(writer);\n  defaultWriterClosedPromiseReject(writer, reason);\n}\n\nfunction defaultWriterClosedPromiseInitializeAsResolved(writer: WritableStreamDefaultWriter) {\n  defaultWriterClosedPromiseInitialize(writer);\n  defaultWriterClosedPromiseResolve(writer);\n}\n\nfunction defaultWriterClosedPromiseReject(writer: WritableStreamDefaultWriter, reason: any) {\n  if (writer._closedPromise_reject === undefined) {\n    return;\n  }\n  assert(writer._closedPromiseState === 'pending');\n\n  setPromiseIsHandledToTrue(writer._closedPromise);\n  writer._closedPromise_reject(reason);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'rejected';\n}\n\nfunction defaultWriterClosedPromiseResetToRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  assert(writer._closedPromise_resolve === undefined);\n  assert(writer._closedPromise_reject === undefined);\n  assert(writer._closedPromiseState !== 'pending');\n\n  defaultWriterClosedPromiseInitializeAsRejected(writer, reason);\n}\n\nfunction defaultWriterClosedPromiseResolve(writer: WritableStreamDefaultWriter) {\n  if (writer._closedPromise_resolve === undefined) {\n    return;\n  }\n  assert(writer._closedPromiseState === 'pending');\n\n  writer._closedPromise_resolve(undefined);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'resolved';\n}\n\nfunction defaultWriterReadyPromiseInitialize(writer: WritableStreamDefaultWriter) {\n  writer._readyPromise = newPromise((resolve, reject) => {\n    writer._readyPromise_resolve = resolve;\n    writer._readyPromise_reject = reject;\n  });\n  writer._readyPromiseState = 'pending';\n}\n\nfunction defaultWriterReadyPromiseInitializeAsRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  defaultWriterReadyPromiseInitialize(writer);\n  defaultWriterReadyPromiseReject(writer, reason);\n}\n\nfunction defaultWriterReadyPromiseInitializeAsResolved(writer: WritableStreamDefaultWriter) {\n  defaultWriterReadyPromiseInitialize(writer);\n  defaultWriterReadyPromiseResolve(writer);\n}\n\nfunction defaultWriterReadyPromiseReject(writer: WritableStreamDefaultWriter, reason: any) {\n  if (writer._readyPromise_reject === undefined) {\n    return;\n  }\n\n  setPromiseIsHandledToTrue(writer._readyPromise);\n  writer._readyPromise_reject(reason);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'rejected';\n}\n\nfunction defaultWriterReadyPromiseReset(writer: WritableStreamDefaultWriter) {\n  assert(writer._readyPromise_resolve === undefined);\n  assert(writer._readyPromise_reject === undefined);\n\n  defaultWriterReadyPromiseInitialize(writer);\n}\n\nfunction defaultWriterReadyPromiseResetToRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  assert(writer._readyPromise_resolve === undefined);\n  assert(writer._readyPromise_reject === undefined);\n\n  defaultWriterReadyPromiseInitializeAsRejected(writer, reason);\n}\n\nfunction defaultWriterReadyPromiseResolve(writer: WritableStreamDefaultWriter) {\n  if (writer._readyPromise_resolve === undefined) {\n    return;\n  }\n\n  writer._readyPromise_resolve(undefined);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'fulfilled';\n}\n","/// <reference lib=\"dom\" />\nexport const NativeDOMException: typeof DOMException | undefined =\n  typeof DOMException !== 'undefined' ? DOMException : undefined;\n","/// <reference types=\"node\" />\nimport { NativeDOMException } from './native';\n\ndeclare class DOMExceptionClass extends Error {\n  constructor(message?: string, name?: string);\n\n  name: string;\n  message: string;\n}\n\ntype DOMException = DOMExceptionClass;\ntype DOMExceptionConstructor = typeof DOMExceptionClass;\n\nfunction isDOMExceptionConstructor(ctor: unknown): ctor is DOMExceptionConstructor {\n  if (!(typeof ctor === 'function' || typeof ctor === 'object')) {\n    return false;\n  }\n  try {\n    new (ctor as DOMExceptionConstructor)();\n    return true;\n  } catch {\n    return false;\n  }\n}\n\nfunction createDOMExceptionPolyfill(): DOMExceptionConstructor {\n  // eslint-disable-next-line no-shadow\n  const ctor = function DOMException(this: DOMException, message?: string, name?: string) {\n    this.message = message || '';\n    this.name = name || 'Error';\n    if (Error.captureStackTrace) {\n      Error.captureStackTrace(this, this.constructor);\n    }\n  } as any;\n  ctor.prototype = Object.create(Error.prototype);\n  Object.defineProperty(ctor.prototype, 'constructor', { value: ctor, writable: true, configurable: true });\n  return ctor;\n}\n\n// eslint-disable-next-line no-redeclare\nconst DOMException: DOMExceptionConstructor =\n  isDOMExceptionConstructor(NativeDOMException) ? NativeDOMException : createDOMExceptionPolyfill();\n\nexport { DOMException };\n","import { IsReadableStream, IsReadableStreamLocked, ReadableStream, ReadableStreamCancel } from '../readable-stream';\nimport { AcquireReadableStreamDefaultReader, ReadableStreamDefaultReaderRead } from './default-reader';\nimport { ReadableStreamReaderGenericRelease } from './generic-reader';\nimport {\n  AcquireWritableStreamDefaultWriter,\n  IsWritableStream,\n  IsWritableStreamLocked,\n  WritableStream,\n  WritableStreamAbort,\n  WritableStreamCloseQueuedOrInFlight,\n  WritableStreamDefaultWriterCloseWithErrorPropagation,\n  WritableStreamDefaultWriterRelease,\n  WritableStreamDefaultWriterWrite\n} from '../writable-stream';\nimport assert from '../../stub/assert';\nimport {\n  newPromise,\n  PerformPromiseThen,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  uponFulfillment,\n  uponPromise,\n  uponRejection\n} from '../helpers/webidl';\nimport { noop } from '../../utils';\nimport { AbortSignal, isAbortSignal } from '../abort-signal';\nimport { DOMException } from '../../stub/dom-exception';\n\nexport function ReadableStreamPipeTo<T>(source: ReadableStream<T>,\n                                        dest: WritableStream<T>,\n                                        preventClose: boolean,\n                                        preventAbort: boolean,\n                                        preventCancel: boolean,\n                                        signal: AbortSignal | undefined): Promise<undefined> {\n  assert(IsReadableStream(source));\n  assert(IsWritableStream(dest));\n  assert(typeof preventClose === 'boolean');\n  assert(typeof preventAbort === 'boolean');\n  assert(typeof preventCancel === 'boolean');\n  assert(signal === undefined || isAbortSignal(signal));\n  assert(!IsReadableStreamLocked(source));\n  assert(!IsWritableStreamLocked(dest));\n\n  const reader = AcquireReadableStreamDefaultReader<T>(source);\n  const writer = AcquireWritableStreamDefaultWriter<T>(dest);\n\n  source._disturbed = true;\n\n  let shuttingDown = false;\n\n  // This is used to keep track of the spec's requirement that we wait for ongoing writes during shutdown.\n  let currentWrite = promiseResolvedWith<void>(undefined);\n\n  return newPromise((resolve, reject) => {\n    let abortAlgorithm: () => void;\n    if (signal !== undefined) {\n      abortAlgorithm = () => {\n        const error = new DOMException('Aborted', 'AbortError');\n        const actions: Array<() => Promise<void>> = [];\n        if (!preventAbort) {\n          actions.push(() => {\n            if (dest._state === 'writable') {\n              return WritableStreamAbort(dest, error);\n            }\n            return promiseResolvedWith(undefined);\n          });\n        }\n        if (!preventCancel) {\n          actions.push(() => {\n            if (source._state === 'readable') {\n              return ReadableStreamCancel(source, error);\n            }\n            return promiseResolvedWith(undefined);\n          });\n        }\n        shutdownWithAction(() => Promise.all(actions.map(action => action())), true, error);\n      };\n\n      if (signal.aborted) {\n        abortAlgorithm();\n        return;\n      }\n\n      signal.addEventListener('abort', abortAlgorithm);\n    }\n\n    // Using reader and writer, read all chunks from this and write them to dest\n    // - Backpressure must be enforced\n    // - Shutdown must stop all activity\n    function pipeLoop() {\n      return newPromise<void>((resolveLoop, rejectLoop) => {\n        function next(done: boolean) {\n          if (done) {\n            resolveLoop();\n          } else {\n            // Use `PerformPromiseThen` instead of `uponPromise` to avoid\n            // adding unnecessary `.catch(rethrowAssertionErrorRejection)` handlers\n            PerformPromiseThen(pipeStep(), next, rejectLoop);\n          }\n        }\n\n        next(false);\n      });\n    }\n\n    function pipeStep(): Promise<boolean> {\n      if (shuttingDown) {\n        return promiseResolvedWith(true);\n      }\n\n      return PerformPromiseThen(writer._readyPromise, () => {\n        return newPromise<boolean>((resolveRead, rejectRead) => {\n          ReadableStreamDefaultReaderRead(\n            reader,\n            {\n              _chunkSteps: chunk => {\n                currentWrite = PerformPromiseThen(WritableStreamDefaultWriterWrite(writer, chunk), undefined, noop);\n                resolveRead(false);\n              },\n              _closeSteps: () => resolveRead(true),\n              _errorSteps: rejectRead\n            }\n          );\n        });\n      });\n    }\n\n    // Errors must be propagated forward\n    isOrBecomesErrored(source, reader._closedPromise, storedError => {\n      if (!preventAbort) {\n        shutdownWithAction(() => WritableStreamAbort(dest, storedError), true, storedError);\n      } else {\n        shutdown(true, storedError);\n      }\n    });\n\n    // Errors must be propagated backward\n    isOrBecomesErrored(dest, writer._closedPromise, storedError => {\n      if (!preventCancel) {\n        shutdownWithAction(() => ReadableStreamCancel(source, storedError), true, storedError);\n      } else {\n        shutdown(true, storedError);\n      }\n    });\n\n    // Closing must be propagated forward\n    isOrBecomesClosed(source, reader._closedPromise, () => {\n      if (!preventClose) {\n        shutdownWithAction(() => WritableStreamDefaultWriterCloseWithErrorPropagation(writer));\n      } else {\n        shutdown();\n      }\n    });\n\n    // Closing must be propagated backward\n    if (WritableStreamCloseQueuedOrInFlight(dest) || dest._state === 'closed') {\n      const destClosed = new TypeError('the destination writable stream closed before all data could be piped to it');\n\n      if (!preventCancel) {\n        shutdownWithAction(() => ReadableStreamCancel(source, destClosed), true, destClosed);\n      } else {\n        shutdown(true, destClosed);\n      }\n    }\n\n    setPromiseIsHandledToTrue(pipeLoop());\n\n    function waitForWritesToFinish(): Promise<void> {\n      // Another write may have started while we were waiting on this currentWrite, so we have to be sure to wait\n      // for that too.\n      const oldCurrentWrite = currentWrite;\n      return PerformPromiseThen(\n        currentWrite,\n        () => oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined\n      );\n    }\n\n    function isOrBecomesErrored(stream: ReadableStream | WritableStream,\n                                promise: Promise<void>,\n                                action: (reason: any) => void) {\n      if (stream._state === 'errored') {\n        action(stream._storedError);\n      } else {\n        uponRejection(promise, action);\n      }\n    }\n\n    function isOrBecomesClosed(stream: ReadableStream | WritableStream, promise: Promise<void>, action: () => void) {\n      if (stream._state === 'closed') {\n        action();\n      } else {\n        uponFulfillment(promise, action);\n      }\n    }\n\n    function shutdownWithAction(action: () => Promise<unknown>, originalIsError?: boolean, originalError?: any) {\n      if (shuttingDown) {\n        return;\n      }\n      shuttingDown = true;\n\n      if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {\n        uponFulfillment(waitForWritesToFinish(), doTheRest);\n      } else {\n        doTheRest();\n      }\n\n      function doTheRest() {\n        uponPromise(\n          action(),\n          () => finalize(originalIsError, originalError),\n          newError => finalize(true, newError)\n        );\n      }\n    }\n\n    function shutdown(isError?: boolean, error?: any) {\n      if (shuttingDown) {\n        return;\n      }\n      shuttingDown = true;\n\n      if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {\n        uponFulfillment(waitForWritesToFinish(), () => finalize(isError, error));\n      } else {\n        finalize(isError, error);\n      }\n    }\n\n    function finalize(isError?: boolean, error?: any) {\n      WritableStreamDefaultWriterRelease(writer);\n      ReadableStreamReaderGenericRelease(reader);\n\n      if (signal !== undefined) {\n        signal.removeEventListener('abort', abortAlgorithm);\n      }\n      if (isError) {\n        reject(error);\n      } else {\n        resolve(undefined);\n      }\n    }\n  });\n}\n","import { QueuingStrategySizeCallback } from '../queuing-strategy';\nimport assert from '../../stub/assert';\nimport { DequeueValue, EnqueueValueWithSize, QueuePair, ResetQueue } from '../abstract-ops/queue-with-sizes';\nimport {\n  ReadableStreamAddReadRequest,\n  ReadableStreamFulfillReadRequest,\n  ReadableStreamGetNumReadRequests,\n  ReadRequest\n} from './default-reader';\nimport { SimpleQueue } from '../simple-queue';\nimport { IsReadableStreamLocked, ReadableStream, ReadableStreamClose, ReadableStreamError } from '../readable-stream';\nimport { ValidatedUnderlyingSource } from './underlying-source';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { CancelSteps, PullSteps } from '../abstract-ops/internal-methods';\nimport { promiseResolvedWith, uponPromise } from '../helpers/webidl';\n\n/**\n * Allows control of a {@link ReadableStream | readable stream}'s state and internal queue.\n *\n * @public\n */\nexport class ReadableStreamDefaultController<R> {\n  /** @internal */\n  _controlledReadableStream!: ReadableStream<R>;\n  /** @internal */\n  _queue!: SimpleQueue<QueuePair<R>>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _closeRequested!: boolean;\n  /** @internal */\n  _pullAgain!: boolean;\n  /** @internal */\n  _pulling !: boolean;\n  /** @internal */\n  _strategySizeAlgorithm!: QueuingStrategySizeCallback<R>;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _pullAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _cancelAlgorithm!: (reason: any) => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is\n   * over-full. An underlying source ought to use this information to determine when and how to apply backpressure.\n   */\n  get desiredSize(): number | null {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('desiredSize');\n    }\n\n    return ReadableStreamDefaultControllerGetDesiredSize(this);\n  }\n\n  /**\n   * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from\n   * the stream, but once those are read, the stream will become closed.\n   */\n  close(): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('close');\n    }\n\n    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {\n      throw new TypeError('The stream is not in a state that permits close');\n    }\n\n    ReadableStreamDefaultControllerClose(this);\n  }\n\n  /**\n   * Enqueues the given chunk `chunk` in the controlled readable stream.\n   */\n  enqueue(chunk: R): void;\n  enqueue(chunk: R = undefined!): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('enqueue');\n    }\n\n    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {\n      throw new TypeError('The stream is not in a state that permits enqueue');\n    }\n\n    return ReadableStreamDefaultControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.\n   */\n  error(e: any = undefined): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n\n    ReadableStreamDefaultControllerError(this, e);\n  }\n\n  /** @internal */\n  [CancelSteps](reason: any): Promise<void> {\n    ResetQueue(this);\n    const result = this._cancelAlgorithm(reason);\n    ReadableStreamDefaultControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [PullSteps](readRequest: ReadRequest<R>): void {\n    const stream = this._controlledReadableStream;\n\n    if (this._queue.length > 0) {\n      const chunk = DequeueValue(this);\n\n      if (this._closeRequested && this._queue.length === 0) {\n        ReadableStreamDefaultControllerClearAlgorithms(this);\n        ReadableStreamClose(stream);\n      } else {\n        ReadableStreamDefaultControllerCallPullIfNeeded(this);\n      }\n\n      readRequest._chunkSteps(chunk);\n    } else {\n      ReadableStreamAddReadRequest(stream, readRequest);\n      ReadableStreamDefaultControllerCallPullIfNeeded(this);\n    }\n  }\n}\n\nObject.defineProperties(ReadableStreamDefaultController.prototype, {\n  close: { enumerable: true },\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Abstract operations for the ReadableStreamDefaultController.\n\nfunction IsReadableStreamDefaultController<R = any>(x: any): x is ReadableStreamDefaultController<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableStream')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamDefaultController;\n}\n\nfunction ReadableStreamDefaultControllerCallPullIfNeeded(controller: ReadableStreamDefaultController<any>): void {\n  const shouldPull = ReadableStreamDefaultControllerShouldCallPull(controller);\n  if (!shouldPull) {\n    return;\n  }\n\n  if (controller._pulling) {\n    controller._pullAgain = true;\n    return;\n  }\n\n  assert(!controller._pullAgain);\n\n  controller._pulling = true;\n\n  const pullPromise = controller._pullAlgorithm();\n  uponPromise(\n    pullPromise,\n    () => {\n      controller._pulling = false;\n\n      if (controller._pullAgain) {\n        controller._pullAgain = false;\n        ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n      }\n    },\n    e => {\n      ReadableStreamDefaultControllerError(controller, e);\n    }\n  );\n}\n\nfunction ReadableStreamDefaultControllerShouldCallPull(controller: ReadableStreamDefaultController<any>): boolean {\n  const stream = controller._controlledReadableStream;\n\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return false;\n  }\n\n  if (!controller._started) {\n    return false;\n  }\n\n  if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    return true;\n  }\n\n  const desiredSize = ReadableStreamDefaultControllerGetDesiredSize(controller);\n  assert(desiredSize !== null);\n  if (desiredSize! > 0) {\n    return true;\n  }\n\n  return false;\n}\n\nfunction ReadableStreamDefaultControllerClearAlgorithms(controller: ReadableStreamDefaultController<any>) {\n  controller._pullAlgorithm = undefined!;\n  controller._cancelAlgorithm = undefined!;\n  controller._strategySizeAlgorithm = undefined!;\n}\n\n// A client of ReadableStreamDefaultController may use these functions directly to bypass state check.\n\nexport function ReadableStreamDefaultControllerClose(controller: ReadableStreamDefaultController<any>) {\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return;\n  }\n\n  const stream = controller._controlledReadableStream;\n\n  controller._closeRequested = true;\n\n  if (controller._queue.length === 0) {\n    ReadableStreamDefaultControllerClearAlgorithms(controller);\n    ReadableStreamClose(stream);\n  }\n}\n\nexport function ReadableStreamDefaultControllerEnqueue<R>(\n  controller: ReadableStreamDefaultController<R>,\n  chunk: R\n): void {\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return;\n  }\n\n  const stream = controller._controlledReadableStream;\n\n  if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    ReadableStreamFulfillReadRequest(stream, chunk, false);\n  } else {\n    let chunkSize;\n    try {\n      chunkSize = controller._strategySizeAlgorithm(chunk);\n    } catch (chunkSizeE) {\n      ReadableStreamDefaultControllerError(controller, chunkSizeE);\n      throw chunkSizeE;\n    }\n\n    try {\n      EnqueueValueWithSize(controller, chunk, chunkSize);\n    } catch (enqueueE) {\n      ReadableStreamDefaultControllerError(controller, enqueueE);\n      throw enqueueE;\n    }\n  }\n\n  ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n}\n\nexport function ReadableStreamDefaultControllerError(controller: ReadableStreamDefaultController<any>, e: any) {\n  const stream = controller._controlledReadableStream;\n\n  if (stream._state !== 'readable') {\n    return;\n  }\n\n  ResetQueue(controller);\n\n  ReadableStreamDefaultControllerClearAlgorithms(controller);\n  ReadableStreamError(stream, e);\n}\n\nexport function ReadableStreamDefaultControllerGetDesiredSize(\n  controller: ReadableStreamDefaultController<any>\n): number | null {\n  const state = controller._controlledReadableStream._state;\n\n  if (state === 'errored') {\n    return null;\n  }\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\n// This is used in the implementation of TransformStream.\nexport function ReadableStreamDefaultControllerHasBackpressure(\n  controller: ReadableStreamDefaultController<any>\n): boolean {\n  if (ReadableStreamDefaultControllerShouldCallPull(controller)) {\n    return false;\n  }\n\n  return true;\n}\n\nexport function ReadableStreamDefaultControllerCanCloseOrEnqueue(\n  controller: ReadableStreamDefaultController<any>\n): boolean {\n  const state = controller._controlledReadableStream._state;\n\n  if (!controller._closeRequested && state === 'readable') {\n    return true;\n  }\n\n  return false;\n}\n\nexport function SetUpReadableStreamDefaultController<R>(stream: ReadableStream<R>,\n                                                        controller: ReadableStreamDefaultController<R>,\n                                                        startAlgorithm: () => void | PromiseLike<void>,\n                                                        pullAlgorithm: () => Promise<void>,\n                                                        cancelAlgorithm: (reason: any) => Promise<void>,\n                                                        highWaterMark: number,\n                                                        sizeAlgorithm: QueuingStrategySizeCallback<R>) {\n  assert(stream._readableStreamController === undefined);\n\n  controller._controlledReadableStream = stream;\n\n  controller._queue = undefined!;\n  controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._started = false;\n  controller._closeRequested = false;\n  controller._pullAgain = false;\n  controller._pulling = false;\n\n  controller._strategySizeAlgorithm = sizeAlgorithm;\n  controller._strategyHWM = highWaterMark;\n\n  controller._pullAlgorithm = pullAlgorithm;\n  controller._cancelAlgorithm = cancelAlgorithm;\n\n  stream._readableStreamController = controller;\n\n  const startResult = startAlgorithm();\n  uponPromise(\n    promiseResolvedWith(startResult),\n    () => {\n      controller._started = true;\n\n      assert(!controller._pulling);\n      assert(!controller._pullAgain);\n\n      ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n    },\n    r => {\n      ReadableStreamDefaultControllerError(controller, r);\n    }\n  );\n}\n\nexport function SetUpReadableStreamDefaultControllerFromUnderlyingSource<R>(\n  stream: ReadableStream<R>,\n  underlyingSource: ValidatedUnderlyingSource<R>,\n  highWaterMark: number,\n  sizeAlgorithm: QueuingStrategySizeCallback<R>\n) {\n  const controller: ReadableStreamDefaultController<R> = Object.create(ReadableStreamDefaultController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let pullAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let cancelAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingSource.start !== undefined) {\n    startAlgorithm = () => underlyingSource.start!(controller);\n  }\n  if (underlyingSource.pull !== undefined) {\n    pullAlgorithm = () => underlyingSource.pull!(controller);\n  }\n  if (underlyingSource.cancel !== undefined) {\n    cancelAlgorithm = reason => underlyingSource.cancel!(reason);\n  }\n\n  SetUpReadableStreamDefaultController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm\n  );\n}\n\n// Helper functions for the ReadableStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamDefaultController.prototype.${name} can only be used on a ReadableStreamDefaultController`);\n}\n","import {\n  CreateReadableByteStream,\n  CreateReadableStream,\n  IsReadableStream,\n  ReadableByteStream,\n  ReadableStream,\n  ReadableStreamCancel,\n  ReadableStreamReader\n} from '../readable-stream';\nimport { ReadableStreamReaderGenericRelease } from './generic-reader';\nimport {\n  AcquireReadableStreamDefaultReader,\n  IsReadableStreamDefaultReader,\n  ReadableStreamDefaultReaderRead,\n  ReadRequest\n} from './default-reader';\nimport {\n  AcquireReadableStreamBYOBReader,\n  IsReadableStreamBYOBReader,\n  ReadableStreamBYOBReaderRead,\n  ReadIntoRequest\n} from './byob-reader';\nimport assert from '../../stub/assert';\nimport { newPromise, promiseResolvedWith, queueMicrotask, uponRejection } from '../helpers/webidl';\nimport {\n  ReadableStreamDefaultController,\n  ReadableStreamDefaultControllerClose,\n  ReadableStreamDefaultControllerEnqueue,\n  ReadableStreamDefaultControllerError\n} from './default-controller';\nimport {\n  IsReadableByteStreamController,\n  ReadableByteStreamControllerClose,\n  ReadableByteStreamControllerEnqueue,\n  ReadableByteStreamControllerError,\n  ReadableByteStreamControllerGetBYOBRequest,\n  ReadableByteStreamControllerRespond,\n  ReadableByteStreamControllerRespondWithNewView\n} from './byte-stream-controller';\nimport { CreateArrayFromList } from '../abstract-ops/ecmascript';\nimport { CloneAsUint8Array } from '../abstract-ops/miscellaneous';\n\nexport function ReadableStreamTee<R>(stream: ReadableStream<R>,\n                                     cloneForBranch2: boolean): [ReadableStream<R>, ReadableStream<R>] {\n  assert(IsReadableStream(stream));\n  assert(typeof cloneForBranch2 === 'boolean');\n  if (IsReadableByteStreamController(stream._readableStreamController)) {\n    return ReadableByteStreamTee(stream as unknown as ReadableByteStream) as\n      unknown as [ReadableStream<R>, ReadableStream<R>];\n  }\n  return ReadableStreamDefaultTee(stream, cloneForBranch2);\n}\n\nexport function ReadableStreamDefaultTee<R>(stream: ReadableStream<R>,\n                                            cloneForBranch2: boolean): [ReadableStream<R>, ReadableStream<R>] {\n  assert(IsReadableStream(stream));\n  assert(typeof cloneForBranch2 === 'boolean');\n\n  const reader = AcquireReadableStreamDefaultReader<R>(stream);\n\n  let reading = false;\n  let readAgain = false;\n  let canceled1 = false;\n  let canceled2 = false;\n  let reason1: any;\n  let reason2: any;\n  let branch1: ReadableStream<R>;\n  let branch2: ReadableStream<R>;\n\n  let resolveCancelPromise: (value: undefined | Promise<undefined>) => void;\n  const cancelPromise = newPromise<undefined>(resolve => {\n    resolveCancelPromise = resolve;\n  });\n\n  function pullAlgorithm(): Promise<void> {\n    if (reading) {\n      readAgain = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgain = false;\n          const chunk1 = chunk;\n          const chunk2 = chunk;\n\n          // There is no way to access the cloning code right now in the reference implementation.\n          // If we add one then we'll need an implementation for serializable objects.\n          // if (!canceled2 && cloneForBranch2) {\n          //   chunk2 = StructuredDeserialize(StructuredSerialize(chunk2));\n          // }\n\n          if (!canceled1) {\n            ReadableStreamDefaultControllerEnqueue(\n              branch1._readableStreamController as ReadableStreamDefaultController<R>,\n              chunk1\n            );\n          }\n          if (!canceled2) {\n            ReadableStreamDefaultControllerEnqueue(\n              branch2._readableStreamController as ReadableStreamDefaultController<R>,\n              chunk2\n            );\n          }\n\n          reading = false;\n          if (readAgain) {\n            pullAlgorithm();\n          }\n        });\n      },\n      _closeSteps: () => {\n        reading = false;\n        if (!canceled1) {\n          ReadableStreamDefaultControllerClose(branch1._readableStreamController as ReadableStreamDefaultController<R>);\n        }\n        if (!canceled2) {\n          ReadableStreamDefaultControllerClose(branch2._readableStreamController as ReadableStreamDefaultController<R>);\n        }\n\n        if (!canceled1 || !canceled2) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function cancel1Algorithm(reason: any): Promise<void> {\n    canceled1 = true;\n    reason1 = reason;\n    if (canceled2) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function cancel2Algorithm(reason: any): Promise<void> {\n    canceled2 = true;\n    reason2 = reason;\n    if (canceled1) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function startAlgorithm() {\n    // do nothing\n  }\n\n  branch1 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel1Algorithm);\n  branch2 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel2Algorithm);\n\n  uponRejection(reader._closedPromise, (r: any) => {\n    ReadableStreamDefaultControllerError(branch1._readableStreamController as ReadableStreamDefaultController<R>, r);\n    ReadableStreamDefaultControllerError(branch2._readableStreamController as ReadableStreamDefaultController<R>, r);\n    if (!canceled1 || !canceled2) {\n      resolveCancelPromise(undefined);\n    }\n  });\n\n  return [branch1, branch2];\n}\n\nexport function ReadableByteStreamTee(stream: ReadableByteStream): [ReadableByteStream, ReadableByteStream] {\n  assert(IsReadableStream(stream));\n  assert(IsReadableByteStreamController(stream._readableStreamController));\n\n  let reader: ReadableStreamReader<Uint8Array> = AcquireReadableStreamDefaultReader(stream);\n  let reading = false;\n  let readAgainForBranch1 = false;\n  let readAgainForBranch2 = false;\n  let canceled1 = false;\n  let canceled2 = false;\n  let reason1: any;\n  let reason2: any;\n  let branch1: ReadableByteStream;\n  let branch2: ReadableByteStream;\n\n  let resolveCancelPromise: (value: undefined | Promise<undefined>) => void;\n  const cancelPromise = newPromise<void>(resolve => {\n    resolveCancelPromise = resolve;\n  });\n\n  function forwardReaderError(thisReader: ReadableStreamReader<Uint8Array>) {\n    uponRejection(thisReader._closedPromise, r => {\n      if (thisReader !== reader) {\n        return;\n      }\n      ReadableByteStreamControllerError(branch1._readableStreamController, r);\n      ReadableByteStreamControllerError(branch2._readableStreamController, r);\n      if (!canceled1 || !canceled2) {\n        resolveCancelPromise(undefined);\n      }\n    });\n  }\n\n  function pullWithDefaultReader() {\n    if (IsReadableStreamBYOBReader(reader)) {\n      assert(reader._readIntoRequests.length === 0);\n      ReadableStreamReaderGenericRelease(reader);\n\n      reader = AcquireReadableStreamDefaultReader(stream);\n      forwardReaderError(reader);\n    }\n\n    const readRequest: ReadRequest<Uint8Array> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgainForBranch1 = false;\n          readAgainForBranch2 = false;\n\n          const chunk1 = chunk;\n          let chunk2 = chunk;\n          if (!canceled1 && !canceled2) {\n            try {\n              chunk2 = CloneAsUint8Array(chunk);\n            } catch (cloneE) {\n              ReadableByteStreamControllerError(branch1._readableStreamController, cloneE);\n              ReadableByteStreamControllerError(branch2._readableStreamController, cloneE);\n              resolveCancelPromise(ReadableStreamCancel(stream, cloneE));\n              return;\n            }\n          }\n\n          if (!canceled1) {\n            ReadableByteStreamControllerEnqueue(branch1._readableStreamController, chunk1);\n          }\n          if (!canceled2) {\n            ReadableByteStreamControllerEnqueue(branch2._readableStreamController, chunk2);\n          }\n\n          reading = false;\n          if (readAgainForBranch1) {\n            pull1Algorithm();\n          } else if (readAgainForBranch2) {\n            pull2Algorithm();\n          }\n        });\n      },\n      _closeSteps: () => {\n        reading = false;\n        if (!canceled1) {\n          ReadableByteStreamControllerClose(branch1._readableStreamController);\n        }\n        if (!canceled2) {\n          ReadableByteStreamControllerClose(branch2._readableStreamController);\n        }\n        if (branch1._readableStreamController._pendingPullIntos.length > 0) {\n          ReadableByteStreamControllerRespond(branch1._readableStreamController, 0);\n        }\n        if (branch2._readableStreamController._pendingPullIntos.length > 0) {\n          ReadableByteStreamControllerRespond(branch2._readableStreamController, 0);\n        }\n        if (!canceled1 || !canceled2) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n  }\n\n  function pullWithBYOBReader(view: ArrayBufferView, forBranch2: boolean) {\n    if (IsReadableStreamDefaultReader<Uint8Array>(reader)) {\n      assert(reader._readRequests.length === 0);\n      ReadableStreamReaderGenericRelease(reader);\n\n      reader = AcquireReadableStreamBYOBReader(stream);\n      forwardReaderError(reader);\n    }\n\n    const byobBranch = forBranch2 ? branch2 : branch1;\n    const otherBranch = forBranch2 ? branch1 : branch2;\n\n    const readIntoRequest: ReadIntoRequest<ArrayBufferView> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgainForBranch1 = false;\n          readAgainForBranch2 = false;\n\n          const byobCanceled = forBranch2 ? canceled2 : canceled1;\n          const otherCanceled = forBranch2 ? canceled1 : canceled2;\n\n          if (!otherCanceled) {\n            let clonedChunk;\n            try {\n              clonedChunk = CloneAsUint8Array(chunk);\n            } catch (cloneE) {\n              ReadableByteStreamControllerError(byobBranch._readableStreamController, cloneE);\n              ReadableByteStreamControllerError(otherBranch._readableStreamController, cloneE);\n              resolveCancelPromise(ReadableStreamCancel(stream, cloneE));\n              return;\n            }\n            if (!byobCanceled) {\n              ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n            }\n            ReadableByteStreamControllerEnqueue(otherBranch._readableStreamController, clonedChunk);\n          } else if (!byobCanceled) {\n            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n          }\n\n          reading = false;\n          if (readAgainForBranch1) {\n            pull1Algorithm();\n          } else if (readAgainForBranch2) {\n            pull2Algorithm();\n          }\n        });\n      },\n      _closeSteps: chunk => {\n        reading = false;\n\n        const byobCanceled = forBranch2 ? canceled2 : canceled1;\n        const otherCanceled = forBranch2 ? canceled1 : canceled2;\n\n        if (!byobCanceled) {\n          ReadableByteStreamControllerClose(byobBranch._readableStreamController);\n        }\n        if (!otherCanceled) {\n          ReadableByteStreamControllerClose(otherBranch._readableStreamController);\n        }\n\n        if (chunk !== undefined) {\n          assert(chunk.byteLength === 0);\n\n          if (!byobCanceled) {\n            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n          }\n          if (!otherCanceled && otherBranch._readableStreamController._pendingPullIntos.length > 0) {\n            ReadableByteStreamControllerRespond(otherBranch._readableStreamController, 0);\n          }\n        }\n\n        if (!byobCanceled || !otherCanceled) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamBYOBReaderRead(reader, view, readIntoRequest);\n  }\n\n  function pull1Algorithm(): Promise<void> {\n    if (reading) {\n      readAgainForBranch1 = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch1._readableStreamController);\n    if (byobRequest === null) {\n      pullWithDefaultReader();\n    } else {\n      pullWithBYOBReader(byobRequest._view!, false);\n    }\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function pull2Algorithm(): Promise<void> {\n    if (reading) {\n      readAgainForBranch2 = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch2._readableStreamController);\n    if (byobRequest === null) {\n      pullWithDefaultReader();\n    } else {\n      pullWithBYOBReader(byobRequest._view!, true);\n    }\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function cancel1Algorithm(reason: any): Promise<void> {\n    canceled1 = true;\n    reason1 = reason;\n    if (canceled2) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function cancel2Algorithm(reason: any): Promise<void> {\n    canceled2 = true;\n    reason2 = reason;\n    if (canceled1) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function startAlgorithm(): void {\n    return;\n  }\n\n  branch1 = CreateReadableByteStream(startAlgorithm, pull1Algorithm, cancel1Algorithm);\n  branch2 = CreateReadableByteStream(startAlgorithm, pull2Algorithm, cancel2Algorithm);\n\n  forwardReaderError(reader);\n\n  return [branch1, branch2];\n}\n","import { assertDictionary, assertFunction, convertUnsignedLongLongWithEnforceRange } from './basic';\nimport {\n  ReadableStreamController,\n  UnderlyingByteSource,\n  UnderlyingDefaultOrByteSource,\n  UnderlyingDefaultOrByteSourcePullCallback,\n  UnderlyingDefaultOrByteSourceStartCallback,\n  UnderlyingSource,\n  UnderlyingSourceCancelCallback,\n  ValidatedUnderlyingDefaultOrByteSource\n} from '../readable-stream/underlying-source';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\n\nexport function convertUnderlyingDefaultOrByteSource<R>(\n  source: UnderlyingSource<R> | UnderlyingByteSource | null,\n  context: string\n): ValidatedUnderlyingDefaultOrByteSource<R> {\n  assertDictionary(source, context);\n  const original = source as (UnderlyingDefaultOrByteSource<R> | null);\n  const autoAllocateChunkSize = original?.autoAllocateChunkSize;\n  const cancel = original?.cancel;\n  const pull = original?.pull;\n  const start = original?.start;\n  const type = original?.type;\n  return {\n    autoAllocateChunkSize: autoAllocateChunkSize === undefined ?\n      undefined :\n      convertUnsignedLongLongWithEnforceRange(\n        autoAllocateChunkSize,\n        `${context} has member 'autoAllocateChunkSize' that`\n      ),\n    cancel: cancel === undefined ?\n      undefined :\n      convertUnderlyingSourceCancelCallback(cancel, original!, `${context} has member 'cancel' that`),\n    pull: pull === undefined ?\n      undefined :\n      convertUnderlyingSourcePullCallback(pull, original!, `${context} has member 'pull' that`),\n    start: start === undefined ?\n      undefined :\n      convertUnderlyingSourceStartCallback(start, original!, `${context} has member 'start' that`),\n    type: type === undefined ? undefined : convertReadableStreamType(type, `${context} has member 'type' that`)\n  };\n}\n\nfunction convertUnderlyingSourceCancelCallback(\n  fn: UnderlyingSourceCancelCallback,\n  original: UnderlyingDefaultOrByteSource,\n  context: string\n): (reason: any) => Promise<void> {\n  assertFunction(fn, context);\n  return (reason: any) => promiseCall(fn, original, [reason]);\n}\n\nfunction convertUnderlyingSourcePullCallback<R>(\n  fn: UnderlyingDefaultOrByteSourcePullCallback<R>,\n  original: UnderlyingDefaultOrByteSource<R>,\n  context: string\n): (controller: ReadableStreamController<R>) => Promise<void> {\n  assertFunction(fn, context);\n  return (controller: ReadableStreamController<R>) => promiseCall(fn, original, [controller]);\n}\n\nfunction convertUnderlyingSourceStartCallback<R>(\n  fn: UnderlyingDefaultOrByteSourceStartCallback<R>,\n  original: UnderlyingDefaultOrByteSource<R>,\n  context: string\n): UnderlyingDefaultOrByteSourceStartCallback<R> {\n  assertFunction(fn, context);\n  return (controller: ReadableStreamController<R>) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertReadableStreamType(type: string, context: string): 'bytes' {\n  type = `${type}`;\n  if (type !== 'bytes') {\n    throw new TypeError(`${context} '${type}' is not a valid enumeration value for ReadableStreamType`);\n  }\n  return type;\n}\n","import { assertDictionary } from './basic';\nimport { ReadableStreamGetReaderOptions } from '../readable-stream/reader-options';\n\nexport function convertReaderOptions(options: ReadableStreamGetReaderOptions | null | undefined,\n                                     context: string): ReadableStreamGetReaderOptions {\n  assertDictionary(options, context);\n  const mode = options?.mode;\n  return {\n    mode: mode === undefined ? undefined : convertReadableStreamReaderMode(mode, `${context} has member 'mode' that`)\n  };\n}\n\nfunction convertReadableStreamReaderMode(mode: string, context: string): 'byob' {\n  mode = `${mode}`;\n  if (mode !== 'byob') {\n    throw new TypeError(`${context} '${mode}' is not a valid enumeration value for ReadableStreamReaderMode`);\n  }\n  return mode;\n}\n","import { assertDictionary } from './basic';\nimport {\n  ReadableStreamIteratorOptions,\n  ValidatedReadableStreamIteratorOptions\n} from '../readable-stream/iterator-options';\n\nexport function convertIteratorOptions(options: ReadableStreamIteratorOptions | null | undefined,\n                                       context: string): ValidatedReadableStreamIteratorOptions {\n  assertDictionary(options, context);\n  const preventCancel = options?.preventCancel;\n  return { preventCancel: Boolean(preventCancel) };\n}\n","import { assertDictionary } from './basic';\nimport { StreamPipeOptions, ValidatedStreamPipeOptions } from '../readable-stream/pipe-options';\nimport { AbortSignal, isAbortSignal } from '../abort-signal';\n\nexport function convertPipeOptions(options: StreamPipeOptions | null | undefined,\n                                   context: string): ValidatedStreamPipeOptions {\n  assertDictionary(options, context);\n  const preventAbort = options?.preventAbort;\n  const preventCancel = options?.preventCancel;\n  const preventClose = options?.preventClose;\n  const signal = options?.signal;\n  if (signal !== undefined) {\n    assertAbortSignal(signal, `${context} has member 'signal' that`);\n  }\n  return {\n    preventAbort: Boolean(preventAbort),\n    preventCancel: Boolean(preventCancel),\n    preventClose: Boolean(preventClose),\n    signal\n  };\n}\n\nfunction assertAbortSignal(signal: unknown, context: string): asserts signal is AbortSignal {\n  if (!isAbortSignal(signal)) {\n    throw new TypeError(`${context} is not an AbortSignal.`);\n  }\n}\n","import { assertDictionary, assertRequiredField } from './basic';\nimport { ReadableStream } from '../readable-stream';\nimport { WritableStream } from '../writable-stream';\nimport { assertReadableStream } from './readable-stream';\nimport { assertWritableStream } from './writable-stream';\n\nexport function convertReadableWritablePair<RS extends ReadableStream, WS extends WritableStream>(\n  pair: { readable: RS; writable: WS } | null | undefined,\n  context: string\n): { readable: RS; writable: WS } {\n  assertDictionary(pair, context);\n\n  const readable = pair?.readable;\n  assertRequiredField(readable, 'readable', 'ReadableWritablePair');\n  assertReadableStream(readable, `${context} has member 'readable' that`);\n\n  const writable = pair?.writable;\n  assertRequiredField(writable, 'writable', 'ReadableWritablePair');\n  assertWritableStream(writable, `${context} has member 'writable' that`);\n\n  return { readable, writable };\n}\n","import assert from '../stub/assert';\nimport {\n  promiseRejectedWith,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  transformPromiseWith\n} from './helpers/webidl';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { AcquireReadableStreamAsyncIterator, ReadableStreamAsyncIterator } from './readable-stream/async-iterator';\nimport { defaultReaderClosedPromiseReject, defaultReaderClosedPromiseResolve } from './readable-stream/generic-reader';\nimport {\n  AcquireReadableStreamDefaultReader,\n  IsReadableStreamDefaultReader,\n  ReadableStreamDefaultReader,\n  ReadableStreamDefaultReadResult\n} from './readable-stream/default-reader';\nimport {\n  AcquireReadableStreamBYOBReader,\n  IsReadableStreamBYOBReader,\n  ReadableStreamBYOBReader,\n  ReadableStreamBYOBReadResult\n} from './readable-stream/byob-reader';\nimport { ReadableStreamPipeTo } from './readable-stream/pipe';\nimport { ReadableStreamTee } from './readable-stream/tee';\nimport { IsWritableStream, IsWritableStreamLocked, WritableStream } from './writable-stream';\nimport { SimpleQueue } from './simple-queue';\nimport {\n  ReadableByteStreamController,\n  ReadableStreamBYOBRequest,\n  SetUpReadableByteStreamController,\n  SetUpReadableByteStreamControllerFromUnderlyingSource\n} from './readable-stream/byte-stream-controller';\nimport {\n  ReadableStreamDefaultController,\n  SetUpReadableStreamDefaultController,\n  SetUpReadableStreamDefaultControllerFromUnderlyingSource\n} from './readable-stream/default-controller';\nimport {\n  UnderlyingByteSource,\n  UnderlyingByteSourcePullCallback,\n  UnderlyingByteSourceStartCallback,\n  UnderlyingSource,\n  UnderlyingSourceCancelCallback,\n  UnderlyingSourcePullCallback,\n  UnderlyingSourceStartCallback\n} from './readable-stream/underlying-source';\nimport { noop } from '../utils';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { CreateArrayFromList } from './abstract-ops/ecmascript';\nimport { CancelSteps } from './abstract-ops/internal-methods';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { assertObject, assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport { convertUnderlyingDefaultOrByteSource } from './validators/underlying-source';\nimport { ReadableStreamGetReaderOptions } from './readable-stream/reader-options';\nimport { convertReaderOptions } from './validators/reader-options';\nimport { StreamPipeOptions, ValidatedStreamPipeOptions } from './readable-stream/pipe-options';\nimport { ReadableStreamIteratorOptions } from './readable-stream/iterator-options';\nimport { convertIteratorOptions } from './validators/iterator-options';\nimport { convertPipeOptions } from './validators/pipe-options';\nimport { ReadableWritablePair } from './readable-stream/readable-writable-pair';\nimport { convertReadableWritablePair } from './validators/readable-writable-pair';\n\nexport type ReadableByteStream = ReadableStream<Uint8Array> & {\n  _readableStreamController: ReadableByteStreamController\n};\n\ntype ReadableStreamState = 'readable' | 'closed' | 'errored';\n\n/**\n * A readable stream represents a source of data, from which you can read.\n *\n * @public\n */\nexport class ReadableStream<R = any> {\n  /** @internal */\n  _state!: ReadableStreamState;\n  /** @internal */\n  _reader: ReadableStreamReader<R> | undefined;\n  /** @internal */\n  _storedError: any;\n  /** @internal */\n  _disturbed!: boolean;\n  /** @internal */\n  _readableStreamController!: ReadableStreamDefaultController<R> | ReadableByteStreamController;\n\n  constructor(underlyingSource: UnderlyingByteSource, strategy?: { highWaterMark?: number; size?: undefined });\n  constructor(underlyingSource?: UnderlyingSource<R>, strategy?: QueuingStrategy<R>);\n  constructor(rawUnderlyingSource: UnderlyingSource<R> | UnderlyingByteSource | null | undefined = {},\n              rawStrategy: QueuingStrategy<R> | null | undefined = {}) {\n    if (rawUnderlyingSource === undefined) {\n      rawUnderlyingSource = null;\n    } else {\n      assertObject(rawUnderlyingSource, 'First parameter');\n    }\n\n    const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');\n    const underlyingSource = convertUnderlyingDefaultOrByteSource(rawUnderlyingSource, 'First parameter');\n\n    InitializeReadableStream(this);\n\n    if (underlyingSource.type === 'bytes') {\n      if (strategy.size !== undefined) {\n        throw new RangeError('The strategy for a byte stream cannot have a size function');\n      }\n      const highWaterMark = ExtractHighWaterMark(strategy, 0);\n      SetUpReadableByteStreamControllerFromUnderlyingSource(\n        this as unknown as ReadableByteStream,\n        underlyingSource,\n        highWaterMark\n      );\n    } else {\n      assert(underlyingSource.type === undefined);\n      const sizeAlgorithm = ExtractSizeAlgorithm(strategy);\n      const highWaterMark = ExtractHighWaterMark(strategy, 1);\n      SetUpReadableStreamDefaultControllerFromUnderlyingSource(\n        this,\n        underlyingSource,\n        highWaterMark,\n        sizeAlgorithm\n      );\n    }\n  }\n\n  /**\n   * Whether or not the readable stream is locked to a {@link ReadableStreamDefaultReader | reader}.\n   */\n  get locked(): boolean {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('locked');\n    }\n\n    return IsReadableStreamLocked(this);\n  }\n\n  /**\n   * Cancels the stream, signaling a loss of interest in the stream by a consumer.\n   *\n   * The supplied `reason` argument will be given to the underlying source's {@link UnderlyingSource.cancel | cancel()}\n   * method, which might or might not use it.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('cancel'));\n    }\n\n    if (IsReadableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot cancel a stream that already has a reader'));\n    }\n\n    return ReadableStreamCancel(this, reason);\n  }\n\n  /**\n   * Creates a {@link ReadableStreamBYOBReader} and locks the stream to the new reader.\n   *\n   * This call behaves the same way as the no-argument variant, except that it only works on readable byte streams,\n   * i.e. streams which were constructed specifically with the ability to handle \"bring your own buffer\" reading.\n   * The returned BYOB reader provides the ability to directly read individual chunks from the stream via its\n   * {@link ReadableStreamBYOBReader.read | read()} method, into developer-supplied buffers, allowing more precise\n   * control over allocation.\n   */\n  getReader({ mode }: { mode: 'byob' }): ReadableStreamBYOBReader;\n  /**\n   * Creates a {@link ReadableStreamDefaultReader} and locks the stream to the new reader.\n   * While the stream is locked, no other reader can be acquired until this one is released.\n   *\n   * This functionality is especially useful for creating abstractions that desire the ability to consume a stream\n   * in its entirety. By getting a reader for the stream, you can ensure nobody else can interleave reads with yours\n   * or cancel the stream, which would interfere with your abstraction.\n   */\n  getReader(): ReadableStreamDefaultReader<R>;\n  getReader(\n    rawOptions: ReadableStreamGetReaderOptions | null | undefined = undefined\n  ): ReadableStreamDefaultReader<R> | ReadableStreamBYOBReader {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('getReader');\n    }\n\n    const options = convertReaderOptions(rawOptions, 'First parameter');\n\n    if (options.mode === undefined) {\n      return AcquireReadableStreamDefaultReader(this);\n    }\n\n    assert(options.mode === 'byob');\n    return AcquireReadableStreamBYOBReader(this as unknown as ReadableByteStream);\n  }\n\n  /**\n   * Provides a convenient, chainable way of piping this readable stream through a transform stream\n   * (or any other `{ writable, readable }` pair). It simply {@link ReadableStream.pipeTo | pipes} the stream\n   * into the writable side of the supplied pair, and returns the readable side for further use.\n   *\n   * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.\n   */\n  pipeThrough<RS extends ReadableStream>(\n    transform: { readable: RS; writable: WritableStream<R> },\n    options?: StreamPipeOptions\n  ): RS;\n  pipeThrough<RS extends ReadableStream>(\n    rawTransform: { readable: RS; writable: WritableStream<R> } | null | undefined,\n    rawOptions: StreamPipeOptions | null | undefined = {}\n  ): RS {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('pipeThrough');\n    }\n    assertRequiredArgument(rawTransform, 1, 'pipeThrough');\n\n    const transform = convertReadableWritablePair(rawTransform, 'First parameter');\n    const options = convertPipeOptions(rawOptions, 'Second parameter');\n\n    if (IsReadableStreamLocked(this)) {\n      throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked ReadableStream');\n    }\n    if (IsWritableStreamLocked(transform.writable)) {\n      throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked WritableStream');\n    }\n\n    const promise = ReadableStreamPipeTo(\n      this, transform.writable, options.preventClose, options.preventAbort, options.preventCancel, options.signal\n    );\n\n    setPromiseIsHandledToTrue(promise);\n\n    return transform.readable;\n  }\n\n  /**\n   * Pipes this readable stream to a given writable stream. The way in which the piping process behaves under\n   * various error conditions can be customized with a number of passed options. It returns a promise that fulfills\n   * when the piping process completes successfully, or rejects if any errors were encountered.\n   *\n   * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.\n   */\n  pipeTo(destination: WritableStream<R>, options?: StreamPipeOptions): Promise<void>;\n  pipeTo(destination: WritableStream<R> | null | undefined,\n         rawOptions: StreamPipeOptions | null | undefined = {}): Promise<void> {\n    if (!IsReadableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('pipeTo'));\n    }\n\n    if (destination === undefined) {\n      return promiseRejectedWith(`Parameter 1 is required in 'pipeTo'.`);\n    }\n    if (!IsWritableStream(destination)) {\n      return promiseRejectedWith(\n        new TypeError(`ReadableStream.prototype.pipeTo's first argument must be a WritableStream`)\n      );\n    }\n\n    let options: ValidatedStreamPipeOptions;\n    try {\n      options = convertPipeOptions(rawOptions, 'Second parameter');\n    } catch (e) {\n      return promiseRejectedWith(e);\n    }\n\n    if (IsReadableStreamLocked(this)) {\n      return promiseRejectedWith(\n        new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream')\n      );\n    }\n    if (IsWritableStreamLocked(destination)) {\n      return promiseRejectedWith(\n        new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream')\n      );\n    }\n\n    return ReadableStreamPipeTo<R>(\n      this, destination, options.preventClose, options.preventAbort, options.preventCancel, options.signal\n    );\n  }\n\n  /**\n   * Tees this readable stream, returning a two-element array containing the two resulting branches as\n   * new {@link ReadableStream} instances.\n   *\n   * Teeing a stream will lock it, preventing any other consumer from acquiring a reader.\n   * To cancel the stream, cancel both of the resulting branches; a composite cancellation reason will then be\n   * propagated to the stream's underlying source.\n   *\n   * Note that the chunks seen in each branch will be the same object. If the chunks are not immutable,\n   * this could allow interference between the two branches.\n   */\n  tee(): [ReadableStream<R>, ReadableStream<R>] {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('tee');\n    }\n\n    const branches = ReadableStreamTee(this, false);\n    return CreateArrayFromList(branches);\n  }\n\n  /**\n   * Asynchronously iterates over the chunks in the stream's internal queue.\n   *\n   * Asynchronously iterating over the stream will lock it, preventing any other consumer from acquiring a reader.\n   * The lock will be released if the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method\n   * is called, e.g. by breaking out of the loop.\n   *\n   * By default, calling the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method will also\n   * cancel the stream. To prevent this, use the stream's {@link ReadableStream.values | values()} method, passing\n   * `true` for the `preventCancel` option.\n   */\n  values(options?: ReadableStreamIteratorOptions): ReadableStreamAsyncIterator<R>;\n  values(rawOptions: ReadableStreamIteratorOptions | null | undefined = undefined): ReadableStreamAsyncIterator<R> {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('values');\n    }\n\n    const options = convertIteratorOptions(rawOptions, 'First parameter');\n    return AcquireReadableStreamAsyncIterator<R>(this, options.preventCancel);\n  }\n\n  /**\n   * {@inheritDoc ReadableStream.values}\n   */\n  [Symbol.asyncIterator]: (options?: ReadableStreamIteratorOptions) => ReadableStreamAsyncIterator<R>;\n}\n\nObject.defineProperties(ReadableStream.prototype, {\n  cancel: { enumerable: true },\n  getReader: { enumerable: true },\n  pipeThrough: { enumerable: true },\n  pipeTo: { enumerable: true },\n  tee: { enumerable: true },\n  values: { enumerable: true },\n  locked: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStream.prototype, Symbol.toStringTag, {\n    value: 'ReadableStream',\n    configurable: true\n  });\n}\nif (typeof Symbol.asyncIterator === 'symbol') {\n  Object.defineProperty(ReadableStream.prototype, Symbol.asyncIterator, {\n    value: ReadableStream.prototype.values,\n    writable: true,\n    configurable: true\n  });\n}\n\nexport {\n  ReadableStreamAsyncIterator,\n  ReadableStreamDefaultReadResult,\n  ReadableStreamBYOBReadResult,\n  UnderlyingByteSource,\n  UnderlyingSource,\n  UnderlyingSourceStartCallback,\n  UnderlyingSourcePullCallback,\n  UnderlyingSourceCancelCallback,\n  UnderlyingByteSourceStartCallback,\n  UnderlyingByteSourcePullCallback,\n  StreamPipeOptions,\n  ReadableWritablePair,\n  ReadableStreamIteratorOptions\n};\n\n// Abstract operations for the ReadableStream.\n\n// Throws if and only if startAlgorithm throws.\nexport function CreateReadableStream<R>(startAlgorithm: () => void | PromiseLike<void>,\n                                        pullAlgorithm: () => Promise<void>,\n                                        cancelAlgorithm: (reason: any) => Promise<void>,\n                                        highWaterMark = 1,\n                                        sizeAlgorithm: QueuingStrategySizeCallback<R> = () => 1): ReadableStream<R> {\n  assert(IsNonNegativeNumber(highWaterMark));\n\n  const stream: ReadableStream<R> = Object.create(ReadableStream.prototype);\n  InitializeReadableStream(stream);\n\n  const controller: ReadableStreamDefaultController<R> = Object.create(ReadableStreamDefaultController.prototype);\n  SetUpReadableStreamDefaultController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm\n  );\n\n  return stream;\n}\n\n// Throws if and only if startAlgorithm throws.\nexport function CreateReadableByteStream(\n  startAlgorithm: () => void | PromiseLike<void>,\n  pullAlgorithm: () => Promise<void>,\n  cancelAlgorithm: (reason: any) => Promise<void>\n): ReadableByteStream {\n  const stream: ReadableByteStream = Object.create(ReadableStream.prototype);\n  InitializeReadableStream(stream);\n\n  const controller: ReadableByteStreamController = Object.create(ReadableByteStreamController.prototype);\n  SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, 0, undefined);\n\n  return stream;\n}\n\nfunction InitializeReadableStream(stream: ReadableStream) {\n  stream._state = 'readable';\n  stream._reader = undefined;\n  stream._storedError = undefined;\n  stream._disturbed = false;\n}\n\nexport function IsReadableStream(x: unknown): x is ReadableStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readableStreamController')) {\n    return false;\n  }\n\n  return x instanceof ReadableStream;\n}\n\nexport function IsReadableStreamDisturbed(stream: ReadableStream): boolean {\n  assert(IsReadableStream(stream));\n\n  return stream._disturbed;\n}\n\nexport function IsReadableStreamLocked(stream: ReadableStream): boolean {\n  assert(IsReadableStream(stream));\n\n  if (stream._reader === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamCancel<R>(stream: ReadableStream<R>, reason: any): Promise<undefined> {\n  stream._disturbed = true;\n\n  if (stream._state === 'closed') {\n    return promiseResolvedWith(undefined);\n  }\n  if (stream._state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  ReadableStreamClose(stream);\n\n  const reader = stream._reader;\n  if (reader !== undefined && IsReadableStreamBYOBReader(reader)) {\n    reader._readIntoRequests.forEach(readIntoRequest => {\n      readIntoRequest._closeSteps(undefined);\n    });\n    reader._readIntoRequests = new SimpleQueue();\n  }\n\n  const sourceCancelPromise = stream._readableStreamController[CancelSteps](reason);\n  return transformPromiseWith(sourceCancelPromise, noop);\n}\n\nexport function ReadableStreamClose<R>(stream: ReadableStream<R>): void {\n  assert(stream._state === 'readable');\n\n  stream._state = 'closed';\n\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return;\n  }\n\n  defaultReaderClosedPromiseResolve(reader);\n\n  if (IsReadableStreamDefaultReader<R>(reader)) {\n    reader._readRequests.forEach(readRequest => {\n      readRequest._closeSteps();\n    });\n    reader._readRequests = new SimpleQueue();\n  }\n}\n\nexport function ReadableStreamError<R>(stream: ReadableStream<R>, e: any): void {\n  assert(IsReadableStream(stream));\n  assert(stream._state === 'readable');\n\n  stream._state = 'errored';\n  stream._storedError = e;\n\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return;\n  }\n\n  defaultReaderClosedPromiseReject(reader, e);\n\n  if (IsReadableStreamDefaultReader<R>(reader)) {\n    reader._readRequests.forEach(readRequest => {\n      readRequest._errorSteps(e);\n    });\n\n    reader._readRequests = new SimpleQueue();\n  } else {\n    assert(IsReadableStreamBYOBReader(reader));\n\n    reader._readIntoRequests.forEach(readIntoRequest => {\n      readIntoRequest._errorSteps(e);\n    });\n\n    reader._readIntoRequests = new SimpleQueue();\n  }\n}\n\n// Readers\n\nexport type ReadableStreamReader<R> = ReadableStreamDefaultReader<R> | ReadableStreamBYOBReader;\n\nexport {\n  ReadableStreamDefaultReader,\n  ReadableStreamBYOBReader\n};\n\n// Controllers\n\nexport {\n  ReadableStreamDefaultController,\n  ReadableStreamBYOBRequest,\n  ReadableByteStreamController\n};\n\n// Helper functions for the ReadableStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(`ReadableStream.prototype.${name} can only be used on a ReadableStream`);\n}\n","import { QueuingStrategyInit } from '../queuing-strategy';\nimport { assertDictionary, assertRequiredField, convertUnrestrictedDouble } from './basic';\n\nexport function convertQueuingStrategyInit(init: QueuingStrategyInit | null | undefined,\n                                           context: string): QueuingStrategyInit {\n  assertDictionary(init, context);\n  const highWaterMark = init?.highWaterMark;\n  assertRequiredField(highWaterMark, 'highWaterMark', 'QueuingStrategyInit');\n  return {\n    highWaterMark: convertUnrestrictedDouble(highWaterMark)\n  };\n}\n","import { QueuingStrategy, QueuingStrategyInit } from './queuing-strategy';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategyInit } from './validators/queuing-strategy-init';\n\n// The size function must not have a prototype property nor be a constructor\nconst byteLengthSizeFunction = (chunk: ArrayBufferView): number => {\n  return chunk.byteLength;\n};\ntry {\n  Object.defineProperty(byteLengthSizeFunction, 'name', {\n    value: 'size',\n    configurable: true\n  });\n} catch {\n  // This property is non-configurable in older browsers, so ignore if this throws.\n  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility\n}\n\n/**\n * A queuing strategy that counts the number of bytes in each chunk.\n *\n * @public\n */\nexport default class ByteLengthQueuingStrategy implements QueuingStrategy<ArrayBufferView> {\n  /** @internal */\n  readonly _byteLengthQueuingStrategyHighWaterMark: number;\n\n  constructor(options: QueuingStrategyInit) {\n    assertRequiredArgument(options, 1, 'ByteLengthQueuingStrategy');\n    options = convertQueuingStrategyInit(options, 'First parameter');\n    this._byteLengthQueuingStrategyHighWaterMark = options.highWaterMark;\n  }\n\n  /**\n   * Returns the high water mark provided to the constructor.\n   */\n  get highWaterMark(): number {\n    if (!IsByteLengthQueuingStrategy(this)) {\n      throw byteLengthBrandCheckException('highWaterMark');\n    }\n    return this._byteLengthQueuingStrategyHighWaterMark;\n  }\n\n  /**\n   * Measures the size of `chunk` by returning the value of its `byteLength` property.\n   */\n  get size(): (chunk: ArrayBufferView) => number {\n    if (!IsByteLengthQueuingStrategy(this)) {\n      throw byteLengthBrandCheckException('size');\n    }\n    return byteLengthSizeFunction;\n  }\n}\n\nObject.defineProperties(ByteLengthQueuingStrategy.prototype, {\n  highWaterMark: { enumerable: true },\n  size: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ByteLengthQueuingStrategy.prototype, Symbol.toStringTag, {\n    value: 'ByteLengthQueuingStrategy',\n    configurable: true\n  });\n}\n\n// Helper functions for the ByteLengthQueuingStrategy.\n\nfunction byteLengthBrandCheckException(name: string): TypeError {\n  return new TypeError(`ByteLengthQueuingStrategy.prototype.${name} can only be used on a ByteLengthQueuingStrategy`);\n}\n\nexport function IsByteLengthQueuingStrategy(x: any): x is ByteLengthQueuingStrategy {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_byteLengthQueuingStrategyHighWaterMark')) {\n    return false;\n  }\n\n  return x instanceof ByteLengthQueuingStrategy;\n}\n","import { QueuingStrategy, QueuingStrategyInit } from './queuing-strategy';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategyInit } from './validators/queuing-strategy-init';\n\n// The size function must not have a prototype property nor be a constructor\nconst countSizeFunction = (): 1 => {\n  return 1;\n};\ntry {\n  Object.defineProperty(countSizeFunction, 'name', {\n    value: 'size',\n    configurable: true\n  });\n} catch {\n  // This property is non-configurable in older browsers, so ignore if this throws.\n  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility\n}\n\n/**\n * A queuing strategy that counts the number of chunks.\n *\n * @public\n */\nexport default class CountQueuingStrategy implements QueuingStrategy<any> {\n  /** @internal */\n  readonly _countQueuingStrategyHighWaterMark!: number;\n\n  constructor(options: QueuingStrategyInit) {\n    assertRequiredArgument(options, 1, 'CountQueuingStrategy');\n    options = convertQueuingStrategyInit(options, 'First parameter');\n    this._countQueuingStrategyHighWaterMark = options.highWaterMark;\n  }\n\n  /**\n   * Returns the high water mark provided to the constructor.\n   */\n  get highWaterMark(): number {\n    if (!IsCountQueuingStrategy(this)) {\n      throw countBrandCheckException('highWaterMark');\n    }\n    return this._countQueuingStrategyHighWaterMark;\n  }\n\n  /**\n   * Measures the size of `chunk` by always returning 1.\n   * This ensures that the total queue size is a count of the number of chunks in the queue.\n   */\n  get size(): (chunk: any) => 1 {\n    if (!IsCountQueuingStrategy(this)) {\n      throw countBrandCheckException('size');\n    }\n    return countSizeFunction;\n  }\n}\n\nObject.defineProperties(CountQueuingStrategy.prototype, {\n  highWaterMark: { enumerable: true },\n  size: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(CountQueuingStrategy.prototype, Symbol.toStringTag, {\n    value: 'CountQueuingStrategy',\n    configurable: true\n  });\n}\n\n// Helper functions for the CountQueuingStrategy.\n\nfunction countBrandCheckException(name: string): TypeError {\n  return new TypeError(`CountQueuingStrategy.prototype.${name} can only be used on a CountQueuingStrategy`);\n}\n\nexport function IsCountQueuingStrategy(x: any): x is CountQueuingStrategy {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_countQueuingStrategyHighWaterMark')) {\n    return false;\n  }\n\n  return x instanceof CountQueuingStrategy;\n}\n","import { assertDictionary, assertFunction } from './basic';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\nimport {\n  Transformer,\n  TransformerFlushCallback,\n  TransformerStartCallback,\n  TransformerTransformCallback,\n  ValidatedTransformer\n} from '../transform-stream/transformer';\nimport { TransformStreamDefaultController } from '../transform-stream';\n\nexport function convertTransformer<I, O>(original: Transformer<I, O> | null,\n                                         context: string): ValidatedTransformer<I, O> {\n  assertDictionary(original, context);\n  const flush = original?.flush;\n  const readableType = original?.readableType;\n  const start = original?.start;\n  const transform = original?.transform;\n  const writableType = original?.writableType;\n  return {\n    flush: flush === undefined ?\n      undefined :\n      convertTransformerFlushCallback(flush, original!, `${context} has member 'flush' that`),\n    readableType,\n    start: start === undefined ?\n      undefined :\n      convertTransformerStartCallback(start, original!, `${context} has member 'start' that`),\n    transform: transform === undefined ?\n      undefined :\n      convertTransformerTransformCallback(transform, original!, `${context} has member 'transform' that`),\n    writableType\n  };\n}\n\nfunction convertTransformerFlushCallback<I, O>(\n  fn: TransformerFlushCallback<O>,\n  original: Transformer<I, O>,\n  context: string\n): (controller: TransformStreamDefaultController<O>) => Promise<void> {\n  assertFunction(fn, context);\n  return (controller: TransformStreamDefaultController<O>) => promiseCall(fn, original, [controller]);\n}\n\nfunction convertTransformerStartCallback<I, O>(\n  fn: TransformerStartCallback<O>,\n  original: Transformer<I, O>,\n  context: string\n): TransformerStartCallback<O> {\n  assertFunction(fn, context);\n  return (controller: TransformStreamDefaultController<O>) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertTransformerTransformCallback<I, O>(\n  fn: TransformerTransformCallback<I, O>,\n  original: Transformer<I, O>,\n  context: string\n): (chunk: I, controller: TransformStreamDefaultController<O>) => Promise<void> {\n  assertFunction(fn, context);\n  return (chunk: I, controller: TransformStreamDefaultController<O>) => promiseCall(fn, original, [chunk, controller]);\n}\n","import assert from '../stub/assert';\nimport { newPromise, promiseRejectedWith, promiseResolvedWith, transformPromiseWith } from './helpers/webidl';\nimport { CreateReadableStream, ReadableStream, ReadableStreamDefaultController } from './readable-stream';\nimport {\n  ReadableStreamDefaultControllerCanCloseOrEnqueue,\n  ReadableStreamDefaultControllerClose,\n  ReadableStreamDefaultControllerEnqueue,\n  ReadableStreamDefaultControllerError,\n  ReadableStreamDefaultControllerGetDesiredSize,\n  ReadableStreamDefaultControllerHasBackpressure\n} from './readable-stream/default-controller';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { CreateWritableStream, WritableStream, WritableStreamDefaultControllerErrorIfNeeded } from './writable-stream';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport {\n  Transformer,\n  TransformerFlushCallback,\n  TransformerStartCallback,\n  TransformerTransformCallback,\n  ValidatedTransformer\n} from './transform-stream/transformer';\nimport { convertTransformer } from './validators/transformer';\n\n// Class TransformStream\n\n/**\n * A transform stream consists of a pair of streams: a {@link WritableStream | writable stream},\n * known as its writable side, and a {@link ReadableStream | readable stream}, known as its readable side.\n * In a manner specific to the transform stream in question, writes to the writable side result in new data being\n * made available for reading from the readable side.\n *\n * @public\n */\nexport class TransformStream<I = any, O = any> {\n  /** @internal */\n  _writable!: WritableStream<I>;\n  /** @internal */\n  _readable!: ReadableStream<O>;\n  /** @internal */\n  _backpressure!: boolean;\n  /** @internal */\n  _backpressureChangePromise!: Promise<void>;\n  /** @internal */\n  _backpressureChangePromise_resolve!: () => void;\n  /** @internal */\n  _transformStreamController!: TransformStreamDefaultController<O>;\n\n  constructor(\n    transformer?: Transformer<I, O>,\n    writableStrategy?: QueuingStrategy<I>,\n    readableStrategy?: QueuingStrategy<O>\n  );\n  constructor(rawTransformer: Transformer<I, O> | null | undefined = {},\n              rawWritableStrategy: QueuingStrategy<I> | null | undefined = {},\n              rawReadableStrategy: QueuingStrategy<O> | null | undefined = {}) {\n    if (rawTransformer === undefined) {\n      rawTransformer = null;\n    }\n\n    const writableStrategy = convertQueuingStrategy(rawWritableStrategy, 'Second parameter');\n    const readableStrategy = convertQueuingStrategy(rawReadableStrategy, 'Third parameter');\n\n    const transformer = convertTransformer(rawTransformer, 'First parameter');\n    if (transformer.readableType !== undefined) {\n      throw new RangeError('Invalid readableType specified');\n    }\n    if (transformer.writableType !== undefined) {\n      throw new RangeError('Invalid writableType specified');\n    }\n\n    const readableHighWaterMark = ExtractHighWaterMark(readableStrategy, 0);\n    const readableSizeAlgorithm = ExtractSizeAlgorithm(readableStrategy);\n    const writableHighWaterMark = ExtractHighWaterMark(writableStrategy, 1);\n    const writableSizeAlgorithm = ExtractSizeAlgorithm(writableStrategy);\n\n    let startPromise_resolve!: (value: void | PromiseLike<void>) => void;\n    const startPromise = newPromise<void>(resolve => {\n      startPromise_resolve = resolve;\n    });\n\n    InitializeTransformStream(\n      this, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm\n    );\n    SetUpTransformStreamDefaultControllerFromTransformer(this, transformer);\n\n    if (transformer.start !== undefined) {\n      startPromise_resolve(transformer.start(this._transformStreamController));\n    } else {\n      startPromise_resolve(undefined);\n    }\n  }\n\n  /**\n   * The readable side of the transform stream.\n   */\n  get readable(): ReadableStream<O> {\n    if (!IsTransformStream(this)) {\n      throw streamBrandCheckException('readable');\n    }\n\n    return this._readable;\n  }\n\n  /**\n   * The writable side of the transform stream.\n   */\n  get writable(): WritableStream<I> {\n    if (!IsTransformStream(this)) {\n      throw streamBrandCheckException('writable');\n    }\n\n    return this._writable;\n  }\n}\n\nObject.defineProperties(TransformStream.prototype, {\n  readable: { enumerable: true },\n  writable: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(TransformStream.prototype, Symbol.toStringTag, {\n    value: 'TransformStream',\n    configurable: true\n  });\n}\n\nexport {\n  Transformer,\n  TransformerStartCallback,\n  TransformerFlushCallback,\n  TransformerTransformCallback\n};\n\n// Transform Stream Abstract Operations\n\nexport function CreateTransformStream<I, O>(startAlgorithm: () => void | PromiseLike<void>,\n                                            transformAlgorithm: (chunk: I) => Promise<void>,\n                                            flushAlgorithm: () => Promise<void>,\n                                            writableHighWaterMark = 1,\n                                            writableSizeAlgorithm: QueuingStrategySizeCallback<I> = () => 1,\n                                            readableHighWaterMark = 0,\n                                            readableSizeAlgorithm: QueuingStrategySizeCallback<O> = () => 1) {\n  assert(IsNonNegativeNumber(writableHighWaterMark));\n  assert(IsNonNegativeNumber(readableHighWaterMark));\n\n  const stream: TransformStream<I, O> = Object.create(TransformStream.prototype);\n\n  let startPromise_resolve!: (value: void | PromiseLike<void>) => void;\n  const startPromise = newPromise<void>(resolve => {\n    startPromise_resolve = resolve;\n  });\n\n  InitializeTransformStream(stream, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark,\n                            readableSizeAlgorithm);\n\n  const controller: TransformStreamDefaultController<O> = Object.create(TransformStreamDefaultController.prototype);\n\n  SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);\n\n  const startResult = startAlgorithm();\n  startPromise_resolve(startResult);\n  return stream;\n}\n\nfunction InitializeTransformStream<I, O>(stream: TransformStream<I, O>,\n                                         startPromise: Promise<void>,\n                                         writableHighWaterMark: number,\n                                         writableSizeAlgorithm: QueuingStrategySizeCallback<I>,\n                                         readableHighWaterMark: number,\n                                         readableSizeAlgorithm: QueuingStrategySizeCallback<O>) {\n  function startAlgorithm(): Promise<void> {\n    return startPromise;\n  }\n\n  function writeAlgorithm(chunk: I): Promise<void> {\n    return TransformStreamDefaultSinkWriteAlgorithm(stream, chunk);\n  }\n\n  function abortAlgorithm(reason: any): Promise<void> {\n    return TransformStreamDefaultSinkAbortAlgorithm(stream, reason);\n  }\n\n  function closeAlgorithm(): Promise<void> {\n    return TransformStreamDefaultSinkCloseAlgorithm(stream);\n  }\n\n  stream._writable = CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm,\n                                          writableHighWaterMark, writableSizeAlgorithm);\n\n  function pullAlgorithm(): Promise<void> {\n    return TransformStreamDefaultSourcePullAlgorithm(stream);\n  }\n\n  function cancelAlgorithm(reason: any): Promise<void> {\n    TransformStreamErrorWritableAndUnblockWrite(stream, reason);\n    return promiseResolvedWith(undefined);\n  }\n\n  stream._readable = CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, readableHighWaterMark,\n                                          readableSizeAlgorithm);\n\n  // The [[backpressure]] slot is set to undefined so that it can be initialised by TransformStreamSetBackpressure.\n  stream._backpressure = undefined!;\n  stream._backpressureChangePromise = undefined!;\n  stream._backpressureChangePromise_resolve = undefined!;\n  TransformStreamSetBackpressure(stream, true);\n\n  stream._transformStreamController = undefined!;\n}\n\nfunction IsTransformStream(x: unknown): x is TransformStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_transformStreamController')) {\n    return false;\n  }\n\n  return x instanceof TransformStream;\n}\n\n// This is a no-op if both sides are already errored.\nfunction TransformStreamError(stream: TransformStream, e: any) {\n  ReadableStreamDefaultControllerError(\n    stream._readable._readableStreamController as ReadableStreamDefaultController<any>,\n    e\n  );\n  TransformStreamErrorWritableAndUnblockWrite(stream, e);\n}\n\nfunction TransformStreamErrorWritableAndUnblockWrite(stream: TransformStream, e: any) {\n  TransformStreamDefaultControllerClearAlgorithms(stream._transformStreamController);\n  WritableStreamDefaultControllerErrorIfNeeded(stream._writable._writableStreamController, e);\n  if (stream._backpressure) {\n    // Pretend that pull() was called to permit any pending write() calls to complete. TransformStreamSetBackpressure()\n    // cannot be called from enqueue() or pull() once the ReadableStream is errored, so this will will be the final time\n    // _backpressure is set.\n    TransformStreamSetBackpressure(stream, false);\n  }\n}\n\nfunction TransformStreamSetBackpressure(stream: TransformStream, backpressure: boolean) {\n  // Passes also when called during construction.\n  assert(stream._backpressure !== backpressure);\n\n  if (stream._backpressureChangePromise !== undefined) {\n    stream._backpressureChangePromise_resolve();\n  }\n\n  stream._backpressureChangePromise = newPromise(resolve => {\n    stream._backpressureChangePromise_resolve = resolve;\n  });\n\n  stream._backpressure = backpressure;\n}\n\n// Class TransformStreamDefaultController\n\n/**\n * Allows control of the {@link ReadableStream} and {@link WritableStream} of the associated {@link TransformStream}.\n *\n * @public\n */\nexport class TransformStreamDefaultController<O> {\n  /** @internal */\n  _controlledTransformStream: TransformStream<any, O>;\n  /** @internal */\n  _transformAlgorithm: (chunk: any) => Promise<void>;\n  /** @internal */\n  _flushAlgorithm: () => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the desired size to fill the readable side’s internal queue. It can be negative, if the queue is over-full.\n   */\n  get desiredSize(): number | null {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('desiredSize');\n    }\n\n    const readableController = this._controlledTransformStream._readable._readableStreamController;\n    return ReadableStreamDefaultControllerGetDesiredSize(readableController as ReadableStreamDefaultController<O>);\n  }\n\n  /**\n   * Enqueues the given chunk `chunk` in the readable side of the controlled transform stream.\n   */\n  enqueue(chunk: O): void;\n  enqueue(chunk: O = undefined!): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('enqueue');\n    }\n\n    TransformStreamDefaultControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors both the readable side and the writable side of the controlled transform stream, making all future\n   * interactions with it fail with the given error `e`. Any chunks queued for transformation will be discarded.\n   */\n  error(reason: any = undefined): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n\n    TransformStreamDefaultControllerError(this, reason);\n  }\n\n  /**\n   * Closes the readable side and errors the writable side of the controlled transform stream. This is useful when the\n   * transformer only needs to consume a portion of the chunks written to the writable side.\n   */\n  terminate(): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('terminate');\n    }\n\n    TransformStreamDefaultControllerTerminate(this);\n  }\n}\n\nObject.defineProperties(TransformStreamDefaultController.prototype, {\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  terminate: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(TransformStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'TransformStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Transform Stream Default Controller Abstract Operations\n\nfunction IsTransformStreamDefaultController<O = any>(x: any): x is TransformStreamDefaultController<O> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledTransformStream')) {\n    return false;\n  }\n\n  return x instanceof TransformStreamDefaultController;\n}\n\nfunction SetUpTransformStreamDefaultController<I, O>(stream: TransformStream<I, O>,\n                                                     controller: TransformStreamDefaultController<O>,\n                                                     transformAlgorithm: (chunk: I) => Promise<void>,\n                                                     flushAlgorithm: () => Promise<void>) {\n  assert(IsTransformStream(stream));\n  assert(stream._transformStreamController === undefined);\n\n  controller._controlledTransformStream = stream;\n  stream._transformStreamController = controller;\n\n  controller._transformAlgorithm = transformAlgorithm;\n  controller._flushAlgorithm = flushAlgorithm;\n}\n\nfunction SetUpTransformStreamDefaultControllerFromTransformer<I, O>(stream: TransformStream<I, O>,\n                                     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TransformStreamDefaultController<any>) {\n  controller._transformAlgorithm = undefined!;\n  controller._flushAlgorithm = undefined!;\n}\n\nfunction TransformStreamDefaultControllerEnqueue<O>(controller: TransformStreamDefaultController<O>, chunk: O) {\n  const stream = controller._controlledTransformStream;\n  const readableController = stream._readable._readableStreamController as ReadableStreamDefaultController<O>;\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(readableController)) {\n    throw new TypeError('Readable side is not in a state that permits enqueue');\n  }\n\n  // We throttle transform invocations based on the backpressure of the ReadableStream, but we still\n  // accept TransformStreamDefaultControllerEnqueue() calls.\n\n  try {\n    ReadableStreamDefaultControllerEnqueue(readableController, chunk);\n  } catch (e) {\n    // This happens when readableStrategy.size() throws.\n    TransformStreamErrorWritableAndUnblockWrite(stream, e);\n\n    throw stream._readable._storedError;\n  }\n\n  const backpressure = ReadableStreamDefaultControllerHasBackpressure(readableController);\n  if (backpressure !== stream._backpressure) {\n    assert(backpressure);\n    TransformStreamSetBackpressure(stream, true);\n  }\n}\n\nfunction TransformStreamDefaultControllerError(controller: TransformStreamDefaultController<any>, e: any) {\n  TransformStreamError(controller._controlledTransformStream, e);\n}\n\nfunction TransformStreamDefaultControllerPerformTransform<I, O>(controller: TransformStreamDefaultController<O>,\n                                                                chunk: I) {\n  const transformPromise = controller._transformAlgorithm(chunk);\n  return transformPromiseWith(transformPromise, undefined, r => {\n    TransformStreamError(controller._controlledTransformStream, r);\n    throw r;\n  });\n}\n\nfunction TransformStreamDefaultControllerTerminate<O>(controller: TransformStreamDefaultController<O>) {\n  const stream = controller._controlledTransformStream;\n  const readableController = stream._readable._readableStreamController as ReadableStreamDefaultController<O>;\n\n  ReadableStreamDefaultControllerClose(readableController);\n\n  const error = new TypeError('TransformStream terminated');\n  TransformStreamErrorWritableAndUnblockWrite(stream, error);\n}\n\n// TransformStreamDefaultSink Algorithms\n\nfunction TransformStreamDefaultSinkWriteAlgorithm<I, O>(stream: TransformStream<I, O>, chunk: I): Promise<void> {\n  assert(stream._writable._state === 'writable');\n\n  const controller = stream._transformStreamController;\n\n  if (stream._backpressure) {\n    const backpressureChangePromise = stream._backpressureChangePromise;\n    assert(backpressureChangePromise !== undefined);\n    return transformPromiseWith(backpressureChangePromise, () => {\n      const writable = stream._writable;\n      const state = writable._state;\n      if (state === 'erroring') {\n        throw writable._storedError;\n   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\ No newline at end of file
diff --git a/node_modules/web-streams-polyfill/dist/ponyfill.es2018.mjs b/node_modules/web-streams-polyfill/dist/ponyfill.es2018.mjs
new file mode 100644
index 0000000..f4ddff0
--- /dev/null
+++ b/node_modules/web-streams-polyfill/dist/ponyfill.es2018.mjs
@@ -0,0 +1,4191 @@
+/**
+ * web-streams-polyfill v3.2.1
+ */
+/// <reference lib="es2015.symbol" />
+const SymbolPolyfill = typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol' ?
+    Symbol :
+    description => `Symbol(${description})`;
+
+/// <reference lib="dom" />
+function noop() {
+    return undefined;
+}
+function getGlobals() {
+    if (typeof self !== 'undefined') {
+        return self;
+    }
+    else if (typeof window !== 'undefined') {
+        return window;
+    }
+    else if (typeof global !== 'undefined') {
+        return global;
+    }
+    return undefined;
+}
+const globals = getGlobals();
+
+function typeIsObject(x) {
+    return (typeof x === 'object' && x !== null) || typeof x === 'function';
+}
+const rethrowAssertionErrorRejection = noop;
+
+const originalPromise = Promise;
+const originalPromiseThen = Promise.prototype.then;
+const originalPromiseResolve = Promise.resolve.bind(originalPromise);
+const originalPromiseReject = Promise.reject.bind(originalPromise);
+function newPromise(executor) {
+    return new originalPromise(executor);
+}
+function promiseResolvedWith(value) {
+    return originalPromiseResolve(value);
+}
+function promiseRejectedWith(reason) {
+    return originalPromiseReject(reason);
+}
+function PerformPromiseThen(promise, onFulfilled, onRejected) {
+    // There doesn't appear to be any way to correctly emulate the behaviour from JavaScript, so this is just an
+    // approximation.
+    return originalPromiseThen.call(promise, onFulfilled, onRejected);
+}
+function uponPromise(promise, onFulfilled, onRejected) {
+    PerformPromiseThen(PerformPromiseThen(promise, onFulfilled, onRejected), undefined, rethrowAssertionErrorRejection);
+}
+function uponFulfillment(promise, onFulfilled) {
+    uponPromise(promise, onFulfilled);
+}
+function uponRejection(promise, onRejected) {
+    uponPromise(promise, undefined, onRejected);
+}
+function transformPromiseWith(promise, fulfillmentHandler, rejectionHandler) {
+    return PerformPromiseThen(promise, fulfillmentHandler, rejectionHandler);
+}
+function setPromiseIsHandledToTrue(promise) {
+    PerformPromiseThen(promise, undefined, rethrowAssertionErrorRejection);
+}
+const queueMicrotask = (() => {
+    const globalQueueMicrotask = globals && globals.queueMicrotask;
+    if (typeof globalQueueMicrotask === 'function') {
+        return globalQueueMicrotask;
+    }
+    const resolvedPromise = promiseResolvedWith(undefined);
+    return (fn) => PerformPromiseThen(resolvedPromise, fn);
+})();
+function reflectCall(F, V, args) {
+    if (typeof F !== 'function') {
+        throw new TypeError('Argument is not a function');
+    }
+    return Function.prototype.apply.call(F, V, args);
+}
+function promiseCall(F, V, args) {
+    try {
+        return promiseResolvedWith(reflectCall(F, V, args));
+    }
+    catch (value) {
+        return promiseRejectedWith(value);
+    }
+}
+
+// Original from Chromium
+// https://chromium.googlesource.com/chromium/src/+/0aee4434a4dba42a42abaea9bfbc0cd196a63bc1/third_party/blink/renderer/core/streams/SimpleQueue.js
+const QUEUE_MAX_ARRAY_SIZE = 16384;
+/**
+ * Simple queue structure.
+ *
+ * Avoids scalability issues with using a packed array directly by using
+ * multiple arrays in a linked list and keeping the array size bounded.
+ */
+class SimpleQueue {
+    constructor() {
+        this._cursor = 0;
+        this._size = 0;
+        // _front and _back are always defined.
+        this._front = {
+            _elements: [],
+            _next: undefined
+        };
+        this._back = this._front;
+        // The cursor is used to avoid calling Array.shift().
+        // It contains the index of the front element of the array inside the
+        // front-most node. It is always in the range [0, QUEUE_MAX_ARRAY_SIZE).
+        this._cursor = 0;
+        // When there is only one node, size === elements.length - cursor.
+        this._size = 0;
+    }
+    get length() {
+        return this._size;
+    }
+    // For exception safety, this method is structured in order:
+    // 1. Read state
+    // 2. Calculate required state mutations
+    // 3. Perform state mutations
+    push(element) {
+        const oldBack = this._back;
+        let newBack = oldBack;
+        if (oldBack._elements.length === QUEUE_MAX_ARRAY_SIZE - 1) {
+            newBack = {
+                _elements: [],
+                _next: undefined
+            };
+        }
+        // push() is the mutation most likely to throw an exception, so it
+        // goes first.
+        oldBack._elements.push(element);
+        if (newBack !== oldBack) {
+            this._back = newBack;
+            oldBack._next = newBack;
+        }
+        ++this._size;
+    }
+    // Like push(), shift() follows the read -> calculate -> mutate pattern for
+    // exception safety.
+    shift() { // must not be called on an empty queue
+        const oldFront = this._front;
+        let newFront = oldFront;
+        const oldCursor = this._cursor;
+        let newCursor = oldCursor + 1;
+        const elements = oldFront._elements;
+        const element = elements[oldCursor];
+        if (newCursor === QUEUE_MAX_ARRAY_SIZE) {
+            newFront = oldFront._next;
+            newCursor = 0;
+        }
+        // No mutations before this point.
+        --this._size;
+        this._cursor = newCursor;
+        if (oldFront !== newFront) {
+            this._front = newFront;
+        }
+        // Permit shifted element to be garbage collected.
+        elements[oldCursor] = undefined;
+        return element;
+    }
+    // The tricky thing about forEach() is that it can be called
+    // re-entrantly. The queue may be mutated inside the callback. It is easy to
+    // see that push() within the callback has no negative effects since the end
+    // of the queue is checked for on every iteration. If shift() is called
+    // repeatedly within the callback then the next iteration may return an
+    // element that has been removed. In this case the callback will be called
+    // with undefined values until we either "catch up" with elements that still
+    // exist or reach the back of the queue.
+    forEach(callback) {
+        let i = this._cursor;
+        let node = this._front;
+        let elements = node._elements;
+        while (i !== elements.length || node._next !== undefined) {
+            if (i === elements.length) {
+                node = node._next;
+                elements = node._elements;
+                i = 0;
+                if (elements.length === 0) {
+                    break;
+                }
+            }
+            callback(elements[i]);
+            ++i;
+        }
+    }
+    // Return the element that would be returned if shift() was called now,
+    // without modifying the queue.
+    peek() { // must not be called on an empty queue
+        const front = this._front;
+        const cursor = this._cursor;
+        return front._elements[cursor];
+    }
+}
+
+function ReadableStreamReaderGenericInitialize(reader, stream) {
+    reader._ownerReadableStream = stream;
+    stream._reader = reader;
+    if (stream._state === 'readable') {
+        defaultReaderClosedPromiseInitialize(reader);
+    }
+    else if (stream._state === 'closed') {
+        defaultReaderClosedPromiseInitializeAsResolved(reader);
+    }
+    else {
+        defaultReaderClosedPromiseInitializeAsRejected(reader, stream._storedError);
+    }
+}
+// A client of ReadableStreamDefaultReader and ReadableStreamBYOBReader may use these functions directly to bypass state
+// check.
+function ReadableStreamReaderGenericCancel(reader, reason) {
+    const stream = reader._ownerReadableStream;
+    return ReadableStreamCancel(stream, reason);
+}
+function ReadableStreamReaderGenericRelease(reader) {
+    if (reader._ownerReadableStream._state === 'readable') {
+        defaultReaderClosedPromiseReject(reader, new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));
+    }
+    else {
+        defaultReaderClosedPromiseResetToRejected(reader, new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));
+    }
+    reader._ownerReadableStream._reader = undefined;
+    reader._ownerReadableStream = undefined;
+}
+// Helper functions for the readers.
+function readerLockException(name) {
+    return new TypeError('Cannot ' + name + ' a stream using a released reader');
+}
+// Helper functions for the ReadableStreamDefaultReader.
+function defaultReaderClosedPromiseInitialize(reader) {
+    reader._closedPromise = newPromise((resolve, reject) => {
+        reader._closedPromise_resolve = resolve;
+        reader._closedPromise_reject = reject;
+    });
+}
+function defaultReaderClosedPromiseInitializeAsRejected(reader, reason) {
+    defaultReaderClosedPromiseInitialize(reader);
+    defaultReaderClosedPromiseReject(reader, reason);
+}
+function defaultReaderClosedPromiseInitializeAsResolved(reader) {
+    defaultReaderClosedPromiseInitialize(reader);
+    defaultReaderClosedPromiseResolve(reader);
+}
+function defaultReaderClosedPromiseReject(reader, reason) {
+    if (reader._closedPromise_reject === undefined) {
+        return;
+    }
+    setPromiseIsHandledToTrue(reader._closedPromise);
+    reader._closedPromise_reject(reason);
+    reader._closedPromise_resolve = undefined;
+    reader._closedPromise_reject = undefined;
+}
+function defaultReaderClosedPromiseResetToRejected(reader, reason) {
+    defaultReaderClosedPromiseInitializeAsRejected(reader, reason);
+}
+function defaultReaderClosedPromiseResolve(reader) {
+    if (reader._closedPromise_resolve === undefined) {
+        return;
+    }
+    reader._closedPromise_resolve(undefined);
+    reader._closedPromise_resolve = undefined;
+    reader._closedPromise_reject = undefined;
+}
+
+const AbortSteps = SymbolPolyfill('[[AbortSteps]]');
+const ErrorSteps = SymbolPolyfill('[[ErrorSteps]]');
+const CancelSteps = SymbolPolyfill('[[CancelSteps]]');
+const PullSteps = SymbolPolyfill('[[PullSteps]]');
+
+/// <reference lib="es2015.core" />
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite#Polyfill
+const NumberIsFinite = Number.isFinite || function (x) {
+    return typeof x === 'number' && isFinite(x);
+};
+
+/// <reference lib="es2015.core" />
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc#Polyfill
+const MathTrunc = Math.trunc || function (v) {
+    return v < 0 ? Math.ceil(v) : Math.floor(v);
+};
+
+// https://heycam.github.io/webidl/#idl-dictionaries
+function isDictionary(x) {
+    return typeof x === 'object' || typeof x === 'function';
+}
+function assertDictionary(obj, context) {
+    if (obj !== undefined && !isDictionary(obj)) {
+        throw new TypeError(`${context} is not an object.`);
+    }
+}
+// https://heycam.github.io/webidl/#idl-callback-functions
+function assertFunction(x, context) {
+    if (typeof x !== 'function') {
+        throw new TypeError(`${context} is not a function.`);
+    }
+}
+// https://heycam.github.io/webidl/#idl-object
+function isObject(x) {
+    return (typeof x === 'object' && x !== null) || typeof x === 'function';
+}
+function assertObject(x, context) {
+    if (!isObject(x)) {
+        throw new TypeError(`${context} is not an object.`);
+    }
+}
+function assertRequiredArgument(x, position, context) {
+    if (x === undefined) {
+        throw new TypeError(`Parameter ${position} is required in '${context}'.`);
+    }
+}
+function assertRequiredField(x, field, context) {
+    if (x === undefined) {
+        throw new TypeError(`${field} is required in '${context}'.`);
+    }
+}
+// https://heycam.github.io/webidl/#idl-unrestricted-double
+function convertUnrestrictedDouble(value) {
+    return Number(value);
+}
+function censorNegativeZero(x) {
+    return x === 0 ? 0 : x;
+}
+function integerPart(x) {
+    return censorNegativeZero(MathTrunc(x));
+}
+// https://heycam.github.io/webidl/#idl-unsigned-long-long
+function convertUnsignedLongLongWithEnforceRange(value, context) {
+    const lowerBound = 0;
+    const upperBound = Number.MAX_SAFE_INTEGER;
+    let x = Number(value);
+    x = censorNegativeZero(x);
+    if (!NumberIsFinite(x)) {
+        throw new TypeError(`${context} is not a finite number`);
+    }
+    x = integerPart(x);
+    if (x < lowerBound || x > upperBound) {
+        throw new TypeError(`${context} is outside the accepted range of ${lowerBound} to ${upperBound}, inclusive`);
+    }
+    if (!NumberIsFinite(x) || x === 0) {
+        return 0;
+    }
+    // TODO Use BigInt if supported?
+    // let xBigInt = BigInt(integerPart(x));
+    // xBigInt = BigInt.asUintN(64, xBigInt);
+    // return Number(xBigInt);
+    return x;
+}
+
+function assertReadableStream(x, context) {
+    if (!IsReadableStream(x)) {
+        throw new TypeError(`${context} is not a ReadableStream.`);
+    }
+}
+
+// Abstract operations for the ReadableStream.
+function AcquireReadableStreamDefaultReader(stream) {
+    return new ReadableStreamDefaultReader(stream);
+}
+// ReadableStream API exposed for controllers.
+function ReadableStreamAddReadRequest(stream, readRequest) {
+    stream._reader._readRequests.push(readRequest);
+}
+function ReadableStreamFulfillReadRequest(stream, chunk, done) {
+    const reader = stream._reader;
+    const readRequest = reader._readRequests.shift();
+    if (done) {
+        readRequest._closeSteps();
+    }
+    else {
+        readRequest._chunkSteps(chunk);
+    }
+}
+function ReadableStreamGetNumReadRequests(stream) {
+    return stream._reader._readRequests.length;
+}
+function ReadableStreamHasDefaultReader(stream) {
+    const reader = stream._reader;
+    if (reader === undefined) {
+        return false;
+    }
+    if (!IsReadableStreamDefaultReader(reader)) {
+        return false;
+    }
+    return true;
+}
+/**
+ * A default reader vended by a {@link ReadableStream}.
+ *
+ * @public
+ */
+class ReadableStreamDefaultReader {
+    constructor(stream) {
+        assertRequiredArgument(stream, 1, 'ReadableStreamDefaultReader');
+        assertReadableStream(stream, 'First parameter');
+        if (IsReadableStreamLocked(stream)) {
+            throw new TypeError('This stream has already been locked for exclusive reading by another reader');
+        }
+        ReadableStreamReaderGenericInitialize(this, stream);
+        this._readRequests = new SimpleQueue();
+    }
+    /**
+     * Returns a promise that will be fulfilled when the stream becomes closed,
+     * or rejected if the stream ever errors or the reader's lock is released before the stream finishes closing.
+     */
+    get closed() {
+        if (!IsReadableStreamDefaultReader(this)) {
+            return promiseRejectedWith(defaultReaderBrandCheckException('closed'));
+        }
+        return this._closedPromise;
+    }
+    /**
+     * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.
+     */
+    cancel(reason = undefined) {
+        if (!IsReadableStreamDefaultReader(this)) {
+            return promiseRejectedWith(defaultReaderBrandCheckException('cancel'));
+        }
+        if (this._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('cancel'));
+        }
+        return ReadableStreamReaderGenericCancel(this, reason);
+    }
+    /**
+     * Returns a promise that allows access to the next chunk from the stream's internal queue, if available.
+     *
+     * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.
+     */
+    read() {
+        if (!IsReadableStreamDefaultReader(this)) {
+            return promiseRejectedWith(defaultReaderBrandCheckException('read'));
+        }
+        if (this._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('read from'));
+        }
+        let resolvePromise;
+        let rejectPromise;
+        const promise = newPromise((resolve, reject) => {
+            resolvePromise = resolve;
+            rejectPromise = reject;
+        });
+        const readRequest = {
+            _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),
+            _closeSteps: () => resolvePromise({ value: undefined, done: true }),
+            _errorSteps: e => rejectPromise(e)
+        };
+        ReadableStreamDefaultReaderRead(this, readRequest);
+        return promise;
+    }
+    /**
+     * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.
+     * If the associated stream is errored when the lock is released, the reader will appear errored in the same way
+     * from now on; otherwise, the reader will appear closed.
+     *
+     * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by
+     * the reader's {@link ReadableStreamDefaultReader.read | read()} method has not yet been settled. Attempting to
+     * do so will throw a `TypeError` and leave the reader locked to the stream.
+     */
+    releaseLock() {
+        if (!IsReadableStreamDefaultReader(this)) {
+            throw defaultReaderBrandCheckException('releaseLock');
+        }
+        if (this._ownerReadableStream === undefined) {
+            return;
+        }
+        if (this._readRequests.length > 0) {
+            throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');
+        }
+        ReadableStreamReaderGenericRelease(this);
+    }
+}
+Object.defineProperties(ReadableStreamDefaultReader.prototype, {
+    cancel: { enumerable: true },
+    read: { enumerable: true },
+    releaseLock: { enumerable: true },
+    closed: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableStreamDefaultReader.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableStreamDefaultReader',
+        configurable: true
+    });
+}
+// Abstract operations for the readers.
+function IsReadableStreamDefaultReader(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_readRequests')) {
+        return false;
+    }
+    return x instanceof ReadableStreamDefaultReader;
+}
+function ReadableStreamDefaultReaderRead(reader, readRequest) {
+    const stream = reader._ownerReadableStream;
+    stream._disturbed = true;
+    if (stream._state === 'closed') {
+        readRequest._closeSteps();
+    }
+    else if (stream._state === 'errored') {
+        readRequest._errorSteps(stream._storedError);
+    }
+    else {
+        stream._readableStreamController[PullSteps](readRequest);
+    }
+}
+// Helper functions for the ReadableStreamDefaultReader.
+function defaultReaderBrandCheckException(name) {
+    return new TypeError(`ReadableStreamDefaultReader.prototype.${name} can only be used on a ReadableStreamDefaultReader`);
+}
+
+/// <reference lib="es2018.asynciterable" />
+/* eslint-disable @typescript-eslint/no-empty-function */
+const AsyncIteratorPrototype = Object.getPrototypeOf(Object.getPrototypeOf(async function* () { }).prototype);
+
+/// <reference lib="es2018.asynciterable" />
+class ReadableStreamAsyncIteratorImpl {
+    constructor(reader, preventCancel) {
+        this._ongoingPromise = undefined;
+        this._isFinished = false;
+        this._reader = reader;
+        this._preventCancel = preventCancel;
+    }
+    next() {
+        const nextSteps = () => this._nextSteps();
+        this._ongoingPromise = this._ongoingPromise ?
+            transformPromiseWith(this._ongoingPromise, nextSteps, nextSteps) :
+            nextSteps();
+        return this._ongoingPromise;
+    }
+    return(value) {
+        const returnSteps = () => this._returnSteps(value);
+        return this._ongoingPromise ?
+            transformPromiseWith(this._ongoingPromise, returnSteps, returnSteps) :
+            returnSteps();
+    }
+    _nextSteps() {
+        if (this._isFinished) {
+            return Promise.resolve({ value: undefined, done: true });
+        }
+        const reader = this._reader;
+        if (reader._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('iterate'));
+        }
+        let resolvePromise;
+        let rejectPromise;
+        const promise = newPromise((resolve, reject) => {
+            resolvePromise = resolve;
+            rejectPromise = reject;
+        });
+        const readRequest = {
+            _chunkSteps: chunk => {
+                this._ongoingPromise = undefined;
+                // This needs to be delayed by one microtask, otherwise we stop pulling too early which breaks a test.
+                // FIXME Is this a bug in the specification, or in the test?
+                queueMicrotask(() => resolvePromise({ value: chunk, done: false }));
+            },
+            _closeSteps: () => {
+                this._ongoingPromise = undefined;
+                this._isFinished = true;
+                ReadableStreamReaderGenericRelease(reader);
+                resolvePromise({ value: undefined, done: true });
+            },
+            _errorSteps: reason => {
+                this._ongoingPromise = undefined;
+                this._isFinished = true;
+                ReadableStreamReaderGenericRelease(reader);
+                rejectPromise(reason);
+            }
+        };
+        ReadableStreamDefaultReaderRead(reader, readRequest);
+        return promise;
+    }
+    _returnSteps(value) {
+        if (this._isFinished) {
+            return Promise.resolve({ value, done: true });
+        }
+        this._isFinished = true;
+        const reader = this._reader;
+        if (reader._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('finish iterating'));
+        }
+        if (!this._preventCancel) {
+            const result = ReadableStreamReaderGenericCancel(reader, value);
+            ReadableStreamReaderGenericRelease(reader);
+            return transformPromiseWith(result, () => ({ value, done: true }));
+        }
+        ReadableStreamReaderGenericRelease(reader);
+        return promiseResolvedWith({ value, done: true });
+    }
+}
+const ReadableStreamAsyncIteratorPrototype = {
+    next() {
+        if (!IsReadableStreamAsyncIterator(this)) {
+            return promiseRejectedWith(streamAsyncIteratorBrandCheckException('next'));
+        }
+        return this._asyncIteratorImpl.next();
+    },
+    return(value) {
+        if (!IsReadableStreamAsyncIterator(this)) {
+            return promiseRejectedWith(streamAsyncIteratorBrandCheckException('return'));
+        }
+        return this._asyncIteratorImpl.return(value);
+    }
+};
+if (AsyncIteratorPrototype !== undefined) {
+    Object.setPrototypeOf(ReadableStreamAsyncIteratorPrototype, AsyncIteratorPrototype);
+}
+// Abstract operations for the ReadableStream.
+function AcquireReadableStreamAsyncIterator(stream, preventCancel) {
+    const reader = AcquireReadableStreamDefaultReader(stream);
+    const impl = new ReadableStreamAsyncIteratorImpl(reader, preventCancel);
+    const iterator = Object.create(ReadableStreamAsyncIteratorPrototype);
+    iterator._asyncIteratorImpl = impl;
+    return iterator;
+}
+function IsReadableStreamAsyncIterator(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_asyncIteratorImpl')) {
+        return false;
+    }
+    try {
+        // noinspection SuspiciousTypeOfGuard
+        return x._asyncIteratorImpl instanceof
+            ReadableStreamAsyncIteratorImpl;
+    }
+    catch (_a) {
+        return false;
+    }
+}
+// Helper functions for the ReadableStream.
+function streamAsyncIteratorBrandCheckException(name) {
+    return new TypeError(`ReadableStreamAsyncIterator.${name} can only be used on a ReadableSteamAsyncIterator`);
+}
+
+/// <reference lib="es2015.core" />
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Polyfill
+const NumberIsNaN = Number.isNaN || function (x) {
+    // eslint-disable-next-line no-self-compare
+    return x !== x;
+};
+
+function CreateArrayFromList(elements) {
+    // We use arrays to represent lists, so this is basically a no-op.
+    // Do a slice though just in case we happen to depend on the unique-ness.
+    return elements.slice();
+}
+function CopyDataBlockBytes(dest, destOffset, src, srcOffset, n) {
+    new Uint8Array(dest).set(new Uint8Array(src, srcOffset, n), destOffset);
+}
+// Not implemented correctly
+function TransferArrayBuffer(O) {
+    return O;
+}
+// Not implemented correctly
+// eslint-disable-next-line @typescript-eslint/no-unused-vars
+function IsDetachedBuffer(O) {
+    return false;
+}
+function ArrayBufferSlice(buffer, begin, end) {
+    // ArrayBuffer.prototype.slice is not available on IE10
+    // https://www.caniuse.com/mdn-javascript_builtins_arraybuffer_slice
+    if (buffer.slice) {
+        return buffer.slice(begin, end);
+    }
+    const length = end - begin;
+    const slice = new ArrayBuffer(length);
+    CopyDataBlockBytes(slice, 0, buffer, begin, length);
+    return slice;
+}
+
+function IsNonNegativeNumber(v) {
+    if (typeof v !== 'number') {
+        return false;
+    }
+    if (NumberIsNaN(v)) {
+        return false;
+    }
+    if (v < 0) {
+        return false;
+    }
+    return true;
+}
+function CloneAsUint8Array(O) {
+    const buffer = ArrayBufferSlice(O.buffer, O.byteOffset, O.byteOffset + O.byteLength);
+    return new Uint8Array(buffer);
+}
+
+function DequeueValue(container) {
+    const pair = container._queue.shift();
+    container._queueTotalSize -= pair.size;
+    if (container._queueTotalSize < 0) {
+        container._queueTotalSize = 0;
+    }
+    return pair.value;
+}
+function EnqueueValueWithSize(container, value, size) {
+    if (!IsNonNegativeNumber(size) || size === Infinity) {
+        throw new RangeError('Size must be a finite, non-NaN, non-negative number.');
+    }
+    container._queue.push({ value, size });
+    container._queueTotalSize += size;
+}
+function PeekQueueValue(container) {
+    const pair = container._queue.peek();
+    return pair.value;
+}
+function ResetQueue(container) {
+    container._queue = new SimpleQueue();
+    container._queueTotalSize = 0;
+}
+
+/**
+ * A pull-into request in a {@link ReadableByteStreamController}.
+ *
+ * @public
+ */
+class ReadableStreamBYOBRequest {
+    constructor() {
+        throw new TypeError('Illegal constructor');
+    }
+    /**
+     * Returns the view for writing in to, or `null` if the BYOB request has already been responded to.
+     */
+    get view() {
+        if (!IsReadableStreamBYOBRequest(this)) {
+            throw byobRequestBrandCheckException('view');
+        }
+        return this._view;
+    }
+    respond(bytesWritten) {
+        if (!IsReadableStreamBYOBRequest(this)) {
+            throw byobRequestBrandCheckException('respond');
+        }
+        assertRequiredArgument(bytesWritten, 1, 'respond');
+        bytesWritten = convertUnsignedLongLongWithEnforceRange(bytesWritten, 'First parameter');
+        if (this._associatedReadableByteStreamController === undefined) {
+            throw new TypeError('This BYOB request has been invalidated');
+        }
+        if (IsDetachedBuffer(this._view.buffer)) ;
+        ReadableByteStreamControllerRespond(this._associatedReadableByteStreamController, bytesWritten);
+    }
+    respondWithNewView(view) {
+        if (!IsReadableStreamBYOBRequest(this)) {
+            throw byobRequestBrandCheckException('respondWithNewView');
+        }
+        assertRequiredArgument(view, 1, 'respondWithNewView');
+        if (!ArrayBuffer.isView(view)) {
+            throw new TypeError('You can only respond with array buffer views');
+        }
+        if (this._associatedReadableByteStreamController === undefined) {
+            throw new TypeError('This BYOB request has been invalidated');
+        }
+        if (IsDetachedBuffer(view.buffer)) ;
+        ReadableByteStreamControllerRespondWithNewView(this._associatedReadableByteStreamController, view);
+    }
+}
+Object.defineProperties(ReadableStreamBYOBRequest.prototype, {
+    respond: { enumerable: true },
+    respondWithNewView: { enumerable: true },
+    view: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableStreamBYOBRequest.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableStreamBYOBRequest',
+        configurable: true
+    });
+}
+/**
+ * Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue.
+ *
+ * @public
+ */
+class ReadableByteStreamController {
+    constructor() {
+        throw new TypeError('Illegal constructor');
+    }
+    /**
+     * Returns the current BYOB pull request, or `null` if there isn't one.
+     */
+    get byobRequest() {
+        if (!IsReadableByteStreamController(this)) {
+            throw byteStreamControllerBrandCheckException('byobRequest');
+        }
+        return ReadableByteStreamControllerGetBYOBRequest(this);
+    }
+    /**
+     * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is
+     * over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure.
+     */
+    get desiredSize() {
+        if (!IsReadableByteStreamController(this)) {
+            throw byteStreamControllerBrandCheckException('desiredSize');
+        }
+        return ReadableByteStreamControllerGetDesiredSize(this);
+    }
+    /**
+     * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from
+     * the stream, but once those are read, the stream will become closed.
+     */
+    close() {
+        if (!IsReadableByteStreamController(this)) {
+            throw byteStreamControllerBrandCheckException('close');
+        }
+        if (this._closeRequested) {
+            throw new TypeError('The stream has already been closed; do not close it again!');
+        }
+        const state = this._controlledReadableByteStream._state;
+        if (state !== 'readable') {
+            throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be closed`);
+        }
+        ReadableByteStreamControllerClose(this);
+    }
+    enqueue(chunk) {
+        if (!IsReadableByteStreamController(this)) {
+            throw byteStreamControllerBrandCheckException('enqueue');
+        }
+        assertRequiredArgument(chunk, 1, 'enqueue');
+        if (!ArrayBuffer.isView(chunk)) {
+            throw new TypeError('chunk must be an array buffer view');
+        }
+        if (chunk.byteLength === 0) {
+            throw new TypeError('chunk must have non-zero byteLength');
+        }
+        if (chunk.buffer.byteLength === 0) {
+            throw new TypeError(`chunk's buffer must have non-zero byteLength`);
+        }
+        if (this._closeRequested) {
+            throw new TypeError('stream is closed or draining');
+        }
+        const state = this._controlledReadableByteStream._state;
+        if (state !== 'readable') {
+            throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be enqueued to`);
+        }
+        ReadableByteStreamControllerEnqueue(this, chunk);
+    }
+    /**
+     * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.
+     */
+    error(e = undefined) {
+        if (!IsReadableByteStreamController(this)) {
+            throw byteStreamControllerBrandCheckException('error');
+        }
+        ReadableByteStreamControllerError(this, e);
+    }
+    /** @internal */
+    [CancelSteps](reason) {
+        ReadableByteStreamControllerClearPendingPullIntos(this);
+        ResetQueue(this);
+        const result = this._cancelAlgorithm(reason);
+        ReadableByteStreamControllerClearAlgorithms(this);
+        return result;
+    }
+    /** @internal */
+    [PullSteps](readRequest) {
+        const stream = this._controlledReadableByteStream;
+        if (this._queueTotalSize > 0) {
+            const entry = this._queue.shift();
+            this._queueTotalSize -= entry.byteLength;
+            ReadableByteStreamControllerHandleQueueDrain(this);
+            const view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);
+            readRequest._chunkSteps(view);
+            return;
+        }
+        const autoAllocateChunkSize = this._autoAllocateChunkSize;
+        if (autoAllocateChunkSize !== undefined) {
+            let buffer;
+            try {
+                buffer = new ArrayBuffer(autoAllocateChunkSize);
+            }
+            catch (bufferE) {
+                readRequest._errorSteps(bufferE);
+                return;
+            }
+            const pullIntoDescriptor = {
+                buffer,
+                bufferByteLength: autoAllocateChunkSize,
+                byteOffset: 0,
+                byteLength: autoAllocateChunkSize,
+                bytesFilled: 0,
+                elementSize: 1,
+                viewConstructor: Uint8Array,
+                readerType: 'default'
+            };
+            this._pendingPullIntos.push(pullIntoDescriptor);
+        }
+        ReadableStreamAddReadRequest(stream, readRequest);
+        ReadableByteStreamControllerCallPullIfNeeded(this);
+    }
+}
+Object.defineProperties(ReadableByteStreamController.prototype, {
+    close: { enumerable: true },
+    enqueue: { enumerable: true },
+    error: { enumerable: true },
+    byobRequest: { enumerable: true },
+    desiredSize: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableByteStreamController.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableByteStreamController',
+        configurable: true
+    });
+}
+// Abstract operations for the ReadableByteStreamController.
+function IsReadableByteStreamController(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableByteStream')) {
+        return false;
+    }
+    return x instanceof ReadableByteStreamController;
+}
+function IsReadableStreamBYOBRequest(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_associatedReadableByteStreamController')) {
+        return false;
+    }
+    return x instanceof ReadableStreamBYOBRequest;
+}
+function ReadableByteStreamControllerCallPullIfNeeded(controller) {
+    const shouldPull = ReadableByteStreamControllerShouldCallPull(controller);
+    if (!shouldPull) {
+        return;
+    }
+    if (controller._pulling) {
+        controller._pullAgain = true;
+        return;
+    }
+    controller._pulling = true;
+    // TODO: Test controller argument
+    const pullPromise = controller._pullAlgorithm();
+    uponPromise(pullPromise, () => {
+        controller._pulling = false;
+        if (controller._pullAgain) {
+            controller._pullAgain = false;
+            ReadableByteStreamControllerCallPullIfNeeded(controller);
+        }
+    }, e => {
+        ReadableByteStreamControllerError(controller, e);
+    });
+}
+function ReadableByteStreamControllerClearPendingPullIntos(controller) {
+    ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+    controller._pendingPullIntos = new SimpleQueue();
+}
+function ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor) {
+    let done = false;
+    if (stream._state === 'closed') {
+        done = true;
+    }
+    const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor);
+    if (pullIntoDescriptor.readerType === 'default') {
+        ReadableStreamFulfillReadRequest(stream, filledView, done);
+    }
+    else {
+        ReadableStreamFulfillReadIntoRequest(stream, filledView, done);
+    }
+}
+function ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor) {
+    const bytesFilled = pullIntoDescriptor.bytesFilled;
+    const elementSize = pullIntoDescriptor.elementSize;
+    return new pullIntoDescriptor.viewConstructor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize);
+}
+function ReadableByteStreamControllerEnqueueChunkToQueue(controller, buffer, byteOffset, byteLength) {
+    controller._queue.push({ buffer, byteOffset, byteLength });
+    controller._queueTotalSize += byteLength;
+}
+function ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor) {
+    const elementSize = pullIntoDescriptor.elementSize;
+    const currentAlignedBytes = pullIntoDescriptor.bytesFilled - pullIntoDescriptor.bytesFilled % elementSize;
+    const maxBytesToCopy = Math.min(controller._queueTotalSize, pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled);
+    const maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;
+    const maxAlignedBytes = maxBytesFilled - maxBytesFilled % elementSize;
+    let totalBytesToCopyRemaining = maxBytesToCopy;
+    let ready = false;
+    if (maxAlignedBytes > currentAlignedBytes) {
+        totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled;
+        ready = true;
+    }
+    const queue = controller._queue;
+    while (totalBytesToCopyRemaining > 0) {
+        const headOfQueue = queue.peek();
+        const bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength);
+        const destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;
+        CopyDataBlockBytes(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy);
+        if (headOfQueue.byteLength === bytesToCopy) {
+            queue.shift();
+        }
+        else {
+            headOfQueue.byteOffset += bytesToCopy;
+            headOfQueue.byteLength -= bytesToCopy;
+        }
+        controller._queueTotalSize -= bytesToCopy;
+        ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor);
+        totalBytesToCopyRemaining -= bytesToCopy;
+    }
+    return ready;
+}
+function ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, size, pullIntoDescriptor) {
+    pullIntoDescriptor.bytesFilled += size;
+}
+function ReadableByteStreamControllerHandleQueueDrain(controller) {
+    if (controller._queueTotalSize === 0 && controller._closeRequested) {
+        ReadableByteStreamControllerClearAlgorithms(controller);
+        ReadableStreamClose(controller._controlledReadableByteStream);
+    }
+    else {
+        ReadableByteStreamControllerCallPullIfNeeded(controller);
+    }
+}
+function ReadableByteStreamControllerInvalidateBYOBRequest(controller) {
+    if (controller._byobRequest === null) {
+        return;
+    }
+    controller._byobRequest._associatedReadableByteStreamController = undefined;
+    controller._byobRequest._view = null;
+    controller._byobRequest = null;
+}
+function ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller) {
+    while (controller._pendingPullIntos.length > 0) {
+        if (controller._queueTotalSize === 0) {
+            return;
+        }
+        const pullIntoDescriptor = controller._pendingPullIntos.peek();
+        if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {
+            ReadableByteStreamControllerShiftPendingPullInto(controller);
+            ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);
+        }
+    }
+}
+function ReadableByteStreamControllerPullInto(controller, view, readIntoRequest) {
+    const stream = controller._controlledReadableByteStream;
+    let elementSize = 1;
+    if (view.constructor !== DataView) {
+        elementSize = view.constructor.BYTES_PER_ELEMENT;
+    }
+    const ctor = view.constructor;
+    // try {
+    const buffer = TransferArrayBuffer(view.buffer);
+    // } catch (e) {
+    //   readIntoRequest._errorSteps(e);
+    //   return;
+    // }
+    const pullIntoDescriptor = {
+        buffer,
+        bufferByteLength: buffer.byteLength,
+        byteOffset: view.byteOffset,
+        byteLength: view.byteLength,
+        bytesFilled: 0,
+        elementSize,
+        viewConstructor: ctor,
+        readerType: 'byob'
+    };
+    if (controller._pendingPullIntos.length > 0) {
+        controller._pendingPullIntos.push(pullIntoDescriptor);
+        // No ReadableByteStreamControllerCallPullIfNeeded() call since:
+        // - No change happens on desiredSize
+        // - The source has already been notified of that there's at least 1 pending read(view)
+        ReadableStreamAddReadIntoRequest(stream, readIntoRequest);
+        return;
+    }
+    if (stream._state === 'closed') {
+        const emptyView = new ctor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0);
+        readIntoRequest._closeSteps(emptyView);
+        return;
+    }
+    if (controller._queueTotalSize > 0) {
+        if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {
+            const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor);
+            ReadableByteStreamControllerHandleQueueDrain(controller);
+            readIntoRequest._chunkSteps(filledView);
+            return;
+        }
+        if (controller._closeRequested) {
+            const e = new TypeError('Insufficient bytes to fill elements in the given buffer');
+            ReadableByteStreamControllerError(controller, e);
+            readIntoRequest._errorSteps(e);
+            return;
+        }
+    }
+    controller._pendingPullIntos.push(pullIntoDescriptor);
+    ReadableStreamAddReadIntoRequest(stream, readIntoRequest);
+    ReadableByteStreamControllerCallPullIfNeeded(controller);
+}
+function ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor) {
+    const stream = controller._controlledReadableByteStream;
+    if (ReadableStreamHasBYOBReader(stream)) {
+        while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {
+            const pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);
+            ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);
+        }
+    }
+}
+function ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, pullIntoDescriptor) {
+    ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor);
+    if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {
+        return;
+    }
+    ReadableByteStreamControllerShiftPendingPullInto(controller);
+    const remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize;
+    if (remainderSize > 0) {
+        const end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;
+        const remainder = ArrayBufferSlice(pullIntoDescriptor.buffer, end - remainderSize, end);
+        ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength);
+    }
+    pullIntoDescriptor.bytesFilled -= remainderSize;
+    ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);
+    ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);
+}
+function ReadableByteStreamControllerRespondInternal(controller, bytesWritten) {
+    const firstDescriptor = controller._pendingPullIntos.peek();
+    ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+    const state = controller._controlledReadableByteStream._state;
+    if (state === 'closed') {
+        ReadableByteStreamControllerRespondInClosedState(controller);
+    }
+    else {
+        ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);
+    }
+    ReadableByteStreamControllerCallPullIfNeeded(controller);
+}
+function ReadableByteStreamControllerShiftPendingPullInto(controller) {
+    const descriptor = controller._pendingPullIntos.shift();
+    return descriptor;
+}
+function ReadableByteStreamControllerShouldCallPull(controller) {
+    const stream = controller._controlledReadableByteStream;
+    if (stream._state !== 'readable') {
+        return false;
+    }
+    if (controller._closeRequested) {
+        return false;
+    }
+    if (!controller._started) {
+        return false;
+    }
+    if (ReadableStreamHasDefaultReader(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+        return true;
+    }
+    if (ReadableStreamHasBYOBReader(stream) && ReadableStreamGetNumReadIntoRequests(stream) > 0) {
+        return true;
+    }
+    const desiredSize = ReadableByteStreamControllerGetDesiredSize(controller);
+    if (desiredSize > 0) {
+        return true;
+    }
+    return false;
+}
+function ReadableByteStreamControllerClearAlgorithms(controller) {
+    controller._pullAlgorithm = undefined;
+    controller._cancelAlgorithm = undefined;
+}
+// A client of ReadableByteStreamController may use these functions directly to bypass state check.
+function ReadableByteStreamControllerClose(controller) {
+    const stream = controller._controlledReadableByteStream;
+    if (controller._closeRequested || stream._state !== 'readable') {
+        return;
+    }
+    if (controller._queueTotalSize > 0) {
+        controller._closeRequested = true;
+        return;
+    }
+    if (controller._pendingPullIntos.length > 0) {
+        const firstPendingPullInto = controller._pendingPullIntos.peek();
+        if (firstPendingPullInto.bytesFilled > 0) {
+            const e = new TypeError('Insufficient bytes to fill elements in the given buffer');
+            ReadableByteStreamControllerError(controller, e);
+            throw e;
+        }
+    }
+    ReadableByteStreamControllerClearAlgorithms(controller);
+    ReadableStreamClose(stream);
+}
+function ReadableByteStreamControllerEnqueue(controller, chunk) {
+    const stream = controller._controlledReadableByteStream;
+    if (controller._closeRequested || stream._state !== 'readable') {
+        return;
+    }
+    const buffer = chunk.buffer;
+    const byteOffset = chunk.byteOffset;
+    const byteLength = chunk.byteLength;
+    const transferredBuffer = TransferArrayBuffer(buffer);
+    if (controller._pendingPullIntos.length > 0) {
+        const firstPendingPullInto = controller._pendingPullIntos.peek();
+        if (IsDetachedBuffer(firstPendingPullInto.buffer)) ;
+        firstPendingPullInto.buffer = TransferArrayBuffer(firstPendingPullInto.buffer);
+    }
+    ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+    if (ReadableStreamHasDefaultReader(stream)) {
+        if (ReadableStreamGetNumReadRequests(stream) === 0) {
+            ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+        }
+        else {
+            if (controller._pendingPullIntos.length > 0) {
+                ReadableByteStreamControllerShiftPendingPullInto(controller);
+            }
+            const transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength);
+            ReadableStreamFulfillReadRequest(stream, transferredView, false);
+        }
+    }
+    else if (ReadableStreamHasBYOBReader(stream)) {
+        // TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully.
+        ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+        ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);
+    }
+    else {
+        ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+    }
+    ReadableByteStreamControllerCallPullIfNeeded(controller);
+}
+function ReadableByteStreamControllerError(controller, e) {
+    const stream = controller._controlledReadableByteStream;
+    if (stream._state !== 'readable') {
+        return;
+    }
+    ReadableByteStreamControllerClearPendingPullIntos(controller);
+    ResetQueue(controller);
+    ReadableByteStreamControllerClearAlgorithms(controller);
+    ReadableStreamError(stream, e);
+}
+function ReadableByteStreamControllerGetBYOBRequest(controller) {
+    if (controller._byobRequest === null && controller._pendingPullIntos.length > 0) {
+        const firstDescriptor = controller._pendingPullIntos.peek();
+        const view = new Uint8Array(firstDescriptor.buffer, firstDescriptor.byteOffset + firstDescriptor.bytesFilled, firstDescriptor.byteLength - firstDescriptor.bytesFilled);
+        const byobRequest = Object.create(ReadableStreamBYOBRequest.prototype);
+        SetUpReadableStreamBYOBRequest(byobRequest, controller, view);
+        controller._byobRequest = byobRequest;
+    }
+    return controller._byobRequest;
+}
+function ReadableByteStreamControllerGetDesiredSize(controller) {
+    const state = controller._controlledReadableByteStream._state;
+    if (state === 'errored') {
+        return null;
+    }
+    if (state === 'closed') {
+        return 0;
+    }
+    return controller._strategyHWM - controller._queueTotalSize;
+}
+function ReadableByteStreamControllerRespond(controller, bytesWritten) {
+    const firstDescriptor = controller._pendingPullIntos.peek();
+    const state = controller._controlledReadableByteStream._state;
+    if (state === 'closed') {
+        if (bytesWritten !== 0) {
+            throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream');
+        }
+    }
+    else {
+        if (bytesWritten === 0) {
+            throw new TypeError('bytesWritten must be greater than 0 when calling respond() on a readable stream');
+        }
+        if (firstDescriptor.bytesFilled + bytesWritten > firstDescriptor.byteLength) {
+            throw new RangeError('bytesWritten out of range');
+        }
+    }
+    firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer);
+    ReadableByteStreamControllerRespondInternal(controller, bytesWritten);
+}
+function ReadableByteStreamControllerRespondWithNewView(controller, view) {
+    const firstDescriptor = controller._pendingPullIntos.peek();
+    const state = controller._controlledReadableByteStream._state;
+    if (state === 'closed') {
+        if (view.byteLength !== 0) {
+            throw new TypeError('The view\'s length must be 0 when calling respondWithNewView() on a closed stream');
+        }
+    }
+    else {
+        if (view.byteLength === 0) {
+            throw new TypeError('The view\'s length must be greater than 0 when calling respondWithNewView() on a readable stream');
+        }
+    }
+    if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) {
+        throw new RangeError('The region specified by view does not match byobRequest');
+    }
+    if (firstDescriptor.bufferByteLength !== view.buffer.byteLength) {
+        throw new RangeError('The buffer of view has different capacity than byobRequest');
+    }
+    if (firstDescriptor.bytesFilled + view.byteLength > firstDescriptor.byteLength) {
+        throw new RangeError('The region specified by view is larger than byobRequest');
+    }
+    const viewByteLength = view.byteLength;
+    firstDescriptor.buffer = TransferArrayBuffer(view.buffer);
+    ReadableByteStreamControllerRespondInternal(controller, viewByteLength);
+}
+function SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize) {
+    controller._controlledReadableByteStream = stream;
+    controller._pullAgain = false;
+    controller._pulling = false;
+    controller._byobRequest = null;
+    // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.
+    controller._queue = controller._queueTotalSize = undefined;
+    ResetQueue(controller);
+    controller._closeRequested = false;
+    controller._started = false;
+    controller._strategyHWM = highWaterMark;
+    controller._pullAlgorithm = pullAlgorithm;
+    controller._cancelAlgorithm = cancelAlgorithm;
+    controller._autoAllocateChunkSize = autoAllocateChunkSize;
+    controller._pendingPullIntos = new SimpleQueue();
+    stream._readableStreamController = controller;
+    const startResult = startAlgorithm();
+    uponPromise(promiseResolvedWith(startResult), () => {
+        controller._started = true;
+        ReadableByteStreamControllerCallPullIfNeeded(controller);
+    }, r => {
+        ReadableByteStreamControllerError(controller, r);
+    });
+}
+function SetUpReadableByteStreamControllerFromUnderlyingSource(stream, underlyingByteSource, highWaterMark) {
+    const controller = Object.create(ReadableByteStreamController.prototype);
+    let startAlgorithm = () => undefined;
+    let pullAlgorithm = () => promiseResolvedWith(undefined);
+    let cancelAlgorithm = () => promiseResolvedWith(undefined);
+    if (underlyingByteSource.start !== undefined) {
+        startAlgorithm = () => underlyingByteSource.start(controller);
+    }
+    if (underlyingByteSource.pull !== undefined) {
+        pullAlgorithm = () => underlyingByteSource.pull(controller);
+    }
+    if (underlyingByteSource.cancel !== undefined) {
+        cancelAlgorithm = reason => underlyingByteSource.cancel(reason);
+    }
+    const autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;
+    if (autoAllocateChunkSize === 0) {
+        throw new TypeError('autoAllocateChunkSize must be greater than 0');
+    }
+    SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize);
+}
+function SetUpReadableStreamBYOBRequest(request, controller, view) {
+    request._associatedReadableByteStreamController = controller;
+    request._view = view;
+}
+// Helper functions for the ReadableStreamBYOBRequest.
+function byobRequestBrandCheckException(name) {
+    return new TypeError(`ReadableStreamBYOBRequest.prototype.${name} can only be used on a ReadableStreamBYOBRequest`);
+}
+// Helper functions for the ReadableByteStreamController.
+function byteStreamControllerBrandCheckException(name) {
+    return new TypeError(`ReadableByteStreamController.prototype.${name} can only be used on a ReadableByteStreamController`);
+}
+
+// Abstract operations for the ReadableStream.
+function AcquireReadableStreamBYOBReader(stream) {
+    return new ReadableStreamBYOBReader(stream);
+}
+// ReadableStream API exposed for controllers.
+function ReadableStreamAddReadIntoRequest(stream, readIntoRequest) {
+    stream._reader._readIntoRequests.push(readIntoRequest);
+}
+function ReadableStreamFulfillReadIntoRequest(stream, chunk, done) {
+    const reader = stream._reader;
+    const readIntoRequest = reader._readIntoRequests.shift();
+    if (done) {
+        readIntoRequest._closeSteps(chunk);
+    }
+    else {
+        readIntoRequest._chunkSteps(chunk);
+    }
+}
+function ReadableStreamGetNumReadIntoRequests(stream) {
+    return stream._reader._readIntoRequests.length;
+}
+function ReadableStreamHasBYOBReader(stream) {
+    const reader = stream._reader;
+    if (reader === undefined) {
+        return false;
+    }
+    if (!IsReadableStreamBYOBReader(reader)) {
+        return false;
+    }
+    return true;
+}
+/**
+ * A BYOB reader vended by a {@link ReadableStream}.
+ *
+ * @public
+ */
+class ReadableStreamBYOBReader {
+    constructor(stream) {
+        assertRequiredArgument(stream, 1, 'ReadableStreamBYOBReader');
+        assertReadableStream(stream, 'First parameter');
+        if (IsReadableStreamLocked(stream)) {
+            throw new TypeError('This stream has already been locked for exclusive reading by another reader');
+        }
+        if (!IsReadableByteStreamController(stream._readableStreamController)) {
+            throw new TypeError('Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte ' +
+                'source');
+        }
+        ReadableStreamReaderGenericInitialize(this, stream);
+        this._readIntoRequests = new SimpleQueue();
+    }
+    /**
+     * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or
+     * the reader's lock is released before the stream finishes closing.
+     */
+    get closed() {
+        if (!IsReadableStreamBYOBReader(this)) {
+            return promiseRejectedWith(byobReaderBrandCheckException('closed'));
+        }
+        return this._closedPromise;
+    }
+    /**
+     * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.
+     */
+    cancel(reason = undefined) {
+        if (!IsReadableStreamBYOBReader(this)) {
+            return promiseRejectedWith(byobReaderBrandCheckException('cancel'));
+        }
+        if (this._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('cancel'));
+        }
+        return ReadableStreamReaderGenericCancel(this, reason);
+    }
+    /**
+     * Attempts to reads bytes into view, and returns a promise resolved with the result.
+     *
+     * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.
+     */
+    read(view) {
+        if (!IsReadableStreamBYOBReader(this)) {
+            return promiseRejectedWith(byobReaderBrandCheckException('read'));
+        }
+        if (!ArrayBuffer.isView(view)) {
+            return promiseRejectedWith(new TypeError('view must be an array buffer view'));
+        }
+        if (view.byteLength === 0) {
+            return promiseRejectedWith(new TypeError('view must have non-zero byteLength'));
+        }
+        if (view.buffer.byteLength === 0) {
+            return promiseRejectedWith(new TypeError(`view's buffer must have non-zero byteLength`));
+        }
+        if (IsDetachedBuffer(view.buffer)) ;
+        if (this._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('read from'));
+        }
+        let resolvePromise;
+        let rejectPromise;
+        const promise = newPromise((resolve, reject) => {
+            resolvePromise = resolve;
+            rejectPromise = reject;
+        });
+        const readIntoRequest = {
+            _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),
+            _closeSteps: chunk => resolvePromise({ value: chunk, done: true }),
+            _errorSteps: e => rejectPromise(e)
+        };
+        ReadableStreamBYOBReaderRead(this, view, readIntoRequest);
+        return promise;
+    }
+    /**
+     * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.
+     * If the associated stream is errored when the lock is released, the reader will appear errored in the same way
+     * from now on; otherwise, the reader will appear closed.
+     *
+     * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by
+     * the reader's {@link ReadableStreamBYOBReader.read | read()} method has not yet been settled. Attempting to
+     * do so will throw a `TypeError` and leave the reader locked to the stream.
+     */
+    releaseLock() {
+        if (!IsReadableStreamBYOBReader(this)) {
+            throw byobReaderBrandCheckException('releaseLock');
+        }
+        if (this._ownerReadableStream === undefined) {
+            return;
+        }
+        if (this._readIntoRequests.length > 0) {
+            throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');
+        }
+        ReadableStreamReaderGenericRelease(this);
+    }
+}
+Object.defineProperties(ReadableStreamBYOBReader.prototype, {
+    cancel: { enumerable: true },
+    read: { enumerable: true },
+    releaseLock: { enumerable: true },
+    closed: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableStreamBYOBReader.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableStreamBYOBReader',
+        configurable: true
+    });
+}
+// Abstract operations for the readers.
+function IsReadableStreamBYOBReader(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_readIntoRequests')) {
+        return false;
+    }
+    return x instanceof ReadableStreamBYOBReader;
+}
+function ReadableStreamBYOBReaderRead(reader, view, readIntoRequest) {
+    const stream = reader._ownerReadableStream;
+    stream._disturbed = true;
+    if (stream._state === 'errored') {
+        readIntoRequest._errorSteps(stream._storedError);
+    }
+    else {
+        ReadableByteStreamControllerPullInto(stream._readableStreamController, view, readIntoRequest);
+    }
+}
+// Helper functions for the ReadableStreamBYOBReader.
+function byobReaderBrandCheckException(name) {
+    return new TypeError(`ReadableStreamBYOBReader.prototype.${name} can only be used on a ReadableStreamBYOBReader`);
+}
+
+function ExtractHighWaterMark(strategy, defaultHWM) {
+    const { highWaterMark } = strategy;
+    if (highWaterMark === undefined) {
+        return defaultHWM;
+    }
+    if (NumberIsNaN(highWaterMark) || highWaterMark < 0) {
+        throw new RangeError('Invalid highWaterMark');
+    }
+    return highWaterMark;
+}
+function ExtractSizeAlgorithm(strategy) {
+    const { size } = strategy;
+    if (!size) {
+        return () => 1;
+    }
+    return size;
+}
+
+function convertQueuingStrategy(init, context) {
+    assertDictionary(init, context);
+    const highWaterMark = init === null || init === void 0 ? void 0 : init.highWaterMark;
+    const size = init === null || init === void 0 ? void 0 : init.size;
+    return {
+        highWaterMark: highWaterMark === undefined ? undefined : convertUnrestrictedDouble(highWaterMark),
+        size: size === undefined ? undefined : convertQueuingStrategySize(size, `${context} has member 'size' that`)
+    };
+}
+function convertQueuingStrategySize(fn, context) {
+    assertFunction(fn, context);
+    return chunk => convertUnrestrictedDouble(fn(chunk));
+}
+
+function convertUnderlyingSink(original, context) {
+    assertDictionary(original, context);
+    const abort = original === null || original === void 0 ? void 0 : original.abort;
+    const close = original === null || original === void 0 ? void 0 : original.close;
+    const start = original === null || original === void 0 ? void 0 : original.start;
+    const type = original === null || original === void 0 ? void 0 : original.type;
+    const write = original === null || original === void 0 ? void 0 : original.write;
+    return {
+        abort: abort === undefined ?
+            undefined :
+            convertUnderlyingSinkAbortCallback(abort, original, `${context} has member 'abort' that`),
+        close: close === undefined ?
+            undefined :
+            convertUnderlyingSinkCloseCallback(close, original, `${context} has member 'close' that`),
+        start: start === undefined ?
+            undefined :
+            convertUnderlyingSinkStartCallback(start, original, `${context} has member 'start' that`),
+        write: write === undefined ?
+            undefined :
+            convertUnderlyingSinkWriteCallback(write, original, `${context} has member 'write' that`),
+        type
+    };
+}
+function convertUnderlyingSinkAbortCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (reason) => promiseCall(fn, original, [reason]);
+}
+function convertUnderlyingSinkCloseCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return () => promiseCall(fn, original, []);
+}
+function convertUnderlyingSinkStartCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (controller) => reflectCall(fn, original, [controller]);
+}
+function convertUnderlyingSinkWriteCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (chunk, controller) => promiseCall(fn, original, [chunk, controller]);
+}
+
+function assertWritableStream(x, context) {
+    if (!IsWritableStream(x)) {
+        throw new TypeError(`${context} is not a WritableStream.`);
+    }
+}
+
+function isAbortSignal(value) {
+    if (typeof value !== 'object' || value === null) {
+        return false;
+    }
+    try {
+        return typeof value.aborted === 'boolean';
+    }
+    catch (_a) {
+        // AbortSignal.prototype.aborted throws if its brand check fails
+        return false;
+    }
+}
+const supportsAbortController = typeof AbortController === 'function';
+/**
+ * Construct a new AbortController, if supported by the platform.
+ *
+ * @internal
+ */
+function createAbortController() {
+    if (supportsAbortController) {
+        return new AbortController();
+    }
+    return undefined;
+}
+
+/**
+ * A writable stream represents a destination for data, into which you can write.
+ *
+ * @public
+ */
+class WritableStream {
+    constructor(rawUnderlyingSink = {}, rawStrategy = {}) {
+        if (rawUnderlyingSink === undefined) {
+            rawUnderlyingSink = null;
+        }
+        else {
+            assertObject(rawUnderlyingSink, 'First parameter');
+        }
+        const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');
+        const underlyingSink = convertUnderlyingSink(rawUnderlyingSink, 'First parameter');
+        InitializeWritableStream(this);
+        const type = underlyingSink.type;
+        if (type !== undefined) {
+            throw new RangeError('Invalid type is specified');
+        }
+        const sizeAlgorithm = ExtractSizeAlgorithm(strategy);
+        const highWaterMark = ExtractHighWaterMark(strategy, 1);
+        SetUpWritableStreamDefaultControllerFromUnderlyingSink(this, underlyingSink, highWaterMark, sizeAlgorithm);
+    }
+    /**
+     * Returns whether or not the writable stream is locked to a writer.
+     */
+    get locked() {
+        if (!IsWritableStream(this)) {
+            throw streamBrandCheckException$2('locked');
+        }
+        return IsWritableStreamLocked(this);
+    }
+    /**
+     * Aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be
+     * immediately moved to an errored state, with any queued-up writes discarded. This will also execute any abort
+     * mechanism of the underlying sink.
+     *
+     * The returned promise will fulfill if the stream shuts down successfully, or reject if the underlying sink signaled
+     * that there was an error doing so. Additionally, it will reject with a `TypeError` (without attempting to cancel
+     * the stream) if the stream is currently locked.
+     */
+    abort(reason = undefined) {
+        if (!IsWritableStream(this)) {
+            return promiseRejectedWith(streamBrandCheckException$2('abort'));
+        }
+        if (IsWritableStreamLocked(this)) {
+            return promiseRejectedWith(new TypeError('Cannot abort a stream that already has a writer'));
+        }
+        return WritableStreamAbort(this, reason);
+    }
+    /**
+     * Closes the stream. The underlying sink will finish processing any previously-written chunks, before invoking its
+     * close behavior. During this time any further attempts to write will fail (without erroring the stream).
+     *
+     * The method returns a promise that will fulfill if all remaining chunks are successfully written and the stream
+     * successfully closes, or rejects if an error is encountered during this process. Additionally, it will reject with
+     * a `TypeError` (without attempting to cancel the stream) if the stream is currently locked.
+     */
+    close() {
+        if (!IsWritableStream(this)) {
+            return promiseRejectedWith(streamBrandCheckException$2('close'));
+        }
+        if (IsWritableStreamLocked(this)) {
+            return promiseRejectedWith(new TypeError('Cannot close a stream that already has a writer'));
+        }
+        if (WritableStreamCloseQueuedOrInFlight(this)) {
+            return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));
+        }
+        return WritableStreamClose(this);
+    }
+    /**
+     * Creates a {@link WritableStreamDefaultWriter | writer} and locks the stream to the new writer. While the stream
+     * is locked, no other writer can be acquired until this one is released.
+     *
+     * This functionality is especially useful for creating abstractions that desire the ability to write to a stream
+     * without interruption or interleaving. By getting a writer for the stream, you can ensure nobody else can write at
+     * the same time, which would cause the resulting written data to be unpredictable and probably useless.
+     */
+    getWriter() {
+        if (!IsWritableStream(this)) {
+            throw streamBrandCheckException$2('getWriter');
+        }
+        return AcquireWritableStreamDefaultWriter(this);
+    }
+}
+Object.defineProperties(WritableStream.prototype, {
+    abort: { enumerable: true },
+    close: { enumerable: true },
+    getWriter: { enumerable: true },
+    locked: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(WritableStream.prototype, SymbolPolyfill.toStringTag, {
+        value: 'WritableStream',
+        configurable: true
+    });
+}
+// Abstract operations for the WritableStream.
+function AcquireWritableStreamDefaultWriter(stream) {
+    return new WritableStreamDefaultWriter(stream);
+}
+// Throws if and only if startAlgorithm throws.
+function CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark = 1, sizeAlgorithm = () => 1) {
+    const stream = Object.create(WritableStream.prototype);
+    InitializeWritableStream(stream);
+    const controller = Object.create(WritableStreamDefaultController.prototype);
+    SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm);
+    return stream;
+}
+function InitializeWritableStream(stream) {
+    stream._state = 'writable';
+    // The error that will be reported by new method calls once the state becomes errored. Only set when [[state]] is
+    // 'erroring' or 'errored'. May be set to an undefined value.
+    stream._storedError = undefined;
+    stream._writer = undefined;
+    // Initialize to undefined first because the constructor of the controller checks this
+    // variable to validate the caller.
+    stream._writableStreamController = undefined;
+    // This queue is placed here instead of the writer class in order to allow for passing a writer to the next data
+    // producer without waiting for the queued writes to finish.
+    stream._writeRequests = new SimpleQueue();
+    // Write requests are removed from _writeRequests when write() is called on the underlying sink. This prevents
+    // them from being erroneously rejected on error. If a write() call is in-flight, the request is stored here.
+    stream._inFlightWriteRequest = undefined;
+    // The promise that was returned from writer.close(). Stored here because it may be fulfilled after the writer
+    // has been detached.
+    stream._closeRequest = undefined;
+    // Close request is removed from _closeRequest when close() is called on the underlying sink. This prevents it
+    // from being erroneously rejected on error. If a close() call is in-flight, the request is stored here.
+    stream._inFlightCloseRequest = undefined;
+    // The promise that was returned from writer.abort(). This may also be fulfilled after the writer has detached.
+    stream._pendingAbortRequest = undefined;
+    // The backpressure signal set by the controller.
+    stream._backpressure = false;
+}
+function IsWritableStream(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_writableStreamController')) {
+        return false;
+    }
+    return x instanceof WritableStream;
+}
+function IsWritableStreamLocked(stream) {
+    if (stream._writer === undefined) {
+        return false;
+    }
+    return true;
+}
+function WritableStreamAbort(stream, reason) {
+    var _a;
+    if (stream._state === 'closed' || stream._state === 'errored') {
+        return promiseResolvedWith(undefined);
+    }
+    stream._writableStreamController._abortReason = reason;
+    (_a = stream._writableStreamController._abortController) === null || _a === void 0 ? void 0 : _a.abort();
+    // TypeScript narrows the type of `stream._state` down to 'writable' | 'erroring',
+    // but it doesn't know that signaling abort runs author code that might have changed the state.
+    // Widen the type again by casting to WritableStreamState.
+    const state = stream._state;
+    if (state === 'closed' || state === 'errored') {
+        return promiseResolvedWith(undefined);
+    }
+    if (stream._pendingAbortRequest !== undefined) {
+        return stream._pendingAbortRequest._promise;
+    }
+    let wasAlreadyErroring = false;
+    if (state === 'erroring') {
+        wasAlreadyErroring = true;
+        // reason will not be used, so don't keep a reference to it.
+        reason = undefined;
+    }
+    const promise = newPromise((resolve, reject) => {
+        stream._pendingAbortRequest = {
+            _promise: undefined,
+            _resolve: resolve,
+            _reject: reject,
+            _reason: reason,
+            _wasAlreadyErroring: wasAlreadyErroring
+        };
+    });
+    stream._pendingAbortRequest._promise = promise;
+    if (!wasAlreadyErroring) {
+        WritableStreamStartErroring(stream, reason);
+    }
+    return promise;
+}
+function WritableStreamClose(stream) {
+    const state = stream._state;
+    if (state === 'closed' || state === 'errored') {
+        return promiseRejectedWith(new TypeError(`The stream (in ${state} state) is not in the writable state and cannot be closed`));
+    }
+    const promise = newPromise((resolve, reject) => {
+        const closeRequest = {
+            _resolve: resolve,
+            _reject: reject
+        };
+        stream._closeRequest = closeRequest;
+    });
+    const writer = stream._writer;
+    if (writer !== undefined && stream._backpressure && state === 'writable') {
+        defaultWriterReadyPromiseResolve(writer);
+    }
+    WritableStreamDefaultControllerClose(stream._writableStreamController);
+    return promise;
+}
+// WritableStream API exposed for controllers.
+function WritableStreamAddWriteRequest(stream) {
+    const promise = newPromise((resolve, reject) => {
+        const writeRequest = {
+            _resolve: resolve,
+            _reject: reject
+        };
+        stream._writeRequests.push(writeRequest);
+    });
+    return promise;
+}
+function WritableStreamDealWithRejection(stream, error) {
+    const state = stream._state;
+    if (state === 'writable') {
+        WritableStreamStartErroring(stream, error);
+        return;
+    }
+    WritableStreamFinishErroring(stream);
+}
+function WritableStreamStartErroring(stream, reason) {
+    const controller = stream._writableStreamController;
+    stream._state = 'erroring';
+    stream._storedError = reason;
+    const writer = stream._writer;
+    if (writer !== undefined) {
+        WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);
+    }
+    if (!WritableStreamHasOperationMarkedInFlight(stream) && controller._started) {
+        WritableStreamFinishErroring(stream);
+    }
+}
+function WritableStreamFinishErroring(stream) {
+    stream._state = 'errored';
+    stream._writableStreamController[ErrorSteps]();
+    const storedError = stream._storedError;
+    stream._writeRequests.forEach(writeRequest => {
+        writeRequest._reject(storedError);
+    });
+    stream._writeRequests = new SimpleQueue();
+    if (stream._pendingAbortRequest === undefined) {
+        WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+        return;
+    }
+    const abortRequest = stream._pendingAbortRequest;
+    stream._pendingAbortRequest = undefined;
+    if (abortRequest._wasAlreadyErroring) {
+        abortRequest._reject(storedError);
+        WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+        return;
+    }
+    const promise = stream._writableStreamController[AbortSteps](abortRequest._reason);
+    uponPromise(promise, () => {
+        abortRequest._resolve();
+        WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+    }, (reason) => {
+        abortRequest._reject(reason);
+        WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+    });
+}
+function WritableStreamFinishInFlightWrite(stream) {
+    stream._inFlightWriteRequest._resolve(undefined);
+    stream._inFlightWriteRequest = undefined;
+}
+function WritableStreamFinishInFlightWriteWithError(stream, error) {
+    stream._inFlightWriteRequest._reject(error);
+    stream._inFlightWriteRequest = undefined;
+    WritableStreamDealWithRejection(stream, error);
+}
+function WritableStreamFinishInFlightClose(stream) {
+    stream._inFlightCloseRequest._resolve(undefined);
+    stream._inFlightCloseRequest = undefined;
+    const state = stream._state;
+    if (state === 'erroring') {
+        // The error was too late to do anything, so it is ignored.
+        stream._storedError = undefined;
+        if (stream._pendingAbortRequest !== undefined) {
+            stream._pendingAbortRequest._resolve();
+            stream._pendingAbortRequest = undefined;
+        }
+    }
+    stream._state = 'closed';
+    const writer = stream._writer;
+    if (writer !== undefined) {
+        defaultWriterClosedPromiseResolve(writer);
+    }
+}
+function WritableStreamFinishInFlightCloseWithError(stream, error) {
+    stream._inFlightCloseRequest._reject(error);
+    stream._inFlightCloseRequest = undefined;
+    // Never execute sink abort() after sink close().
+    if (stream._pendingAbortRequest !== undefined) {
+        stream._pendingAbortRequest._reject(error);
+        stream._pendingAbortRequest = undefined;
+    }
+    WritableStreamDealWithRejection(stream, error);
+}
+// TODO(ricea): Fix alphabetical order.
+function WritableStreamCloseQueuedOrInFlight(stream) {
+    if (stream._closeRequest === undefined && stream._inFlightCloseRequest === undefined) {
+        return false;
+    }
+    return true;
+}
+function WritableStreamHasOperationMarkedInFlight(stream) {
+    if (stream._inFlightWriteRequest === undefined && stream._inFlightCloseRequest === undefined) {
+        return false;
+    }
+    return true;
+}
+function WritableStreamMarkCloseRequestInFlight(stream) {
+    stream._inFlightCloseRequest = stream._closeRequest;
+    stream._closeRequest = undefined;
+}
+function WritableStreamMarkFirstWriteRequestInFlight(stream) {
+    stream._inFlightWriteRequest = stream._writeRequests.shift();
+}
+function WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream) {
+    if (stream._closeRequest !== undefined) {
+        stream._closeRequest._reject(stream._storedError);
+        stream._closeRequest = undefined;
+    }
+    const writer = stream._writer;
+    if (writer !== undefined) {
+        defaultWriterClosedPromiseReject(writer, stream._storedError);
+    }
+}
+function WritableStreamUpdateBackpressure(stream, backpressure) {
+    const writer = stream._writer;
+    if (writer !== undefined && backpressure !== stream._backpressure) {
+        if (backpressure) {
+            defaultWriterReadyPromiseReset(writer);
+        }
+        else {
+            defaultWriterReadyPromiseResolve(writer);
+        }
+    }
+    stream._backpressure = backpressure;
+}
+/**
+ * A default writer vended by a {@link WritableStream}.
+ *
+ * @public
+ */
+class WritableStreamDefaultWriter {
+    constructor(stream) {
+        assertRequiredArgument(stream, 1, 'WritableStreamDefaultWriter');
+        assertWritableStream(stream, 'First parameter');
+        if (IsWritableStreamLocked(stream)) {
+            throw new TypeError('This stream has already been locked for exclusive writing by another writer');
+        }
+        this._ownerWritableStream = stream;
+        stream._writer = this;
+        const state = stream._state;
+        if (state === 'writable') {
+            if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._backpressure) {
+                defaultWriterReadyPromiseInitialize(this);
+            }
+            else {
+                defaultWriterReadyPromiseInitializeAsResolved(this);
+            }
+            defaultWriterClosedPromiseInitialize(this);
+        }
+        else if (state === 'erroring') {
+            defaultWriterReadyPromiseInitializeAsRejected(this, stream._storedError);
+            defaultWriterClosedPromiseInitialize(this);
+        }
+        else if (state === 'closed') {
+            defaultWriterReadyPromiseInitializeAsResolved(this);
+            defaultWriterClosedPromiseInitializeAsResolved(this);
+        }
+        else {
+            const storedError = stream._storedError;
+            defaultWriterReadyPromiseInitializeAsRejected(this, storedError);
+            defaultWriterClosedPromiseInitializeAsRejected(this, storedError);
+        }
+    }
+    /**
+     * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or
+     * the writer’s lock is released before the stream finishes closing.
+     */
+    get closed() {
+        if (!IsWritableStreamDefaultWriter(this)) {
+            return promiseRejectedWith(defaultWriterBrandCheckException('closed'));
+        }
+        return this._closedPromise;
+    }
+    /**
+     * Returns the desired size to fill the stream’s internal queue. It can be negative, if the queue is over-full.
+     * A producer can use this information to determine the right amount of data to write.
+     *
+     * It will be `null` if the stream cannot be successfully written to (due to either being errored, or having an abort
+     * queued up). It will return zero if the stream is closed. And the getter will throw an exception if invoked when
+     * the writer’s lock is released.
+     */
+    get desiredSize() {
+        if (!IsWritableStreamDefaultWriter(this)) {
+            throw defaultWriterBrandCheckException('desiredSize');
+        }
+        if (this._ownerWritableStream === undefined) {
+            throw defaultWriterLockException('desiredSize');
+        }
+        return WritableStreamDefaultWriterGetDesiredSize(this);
+    }
+    /**
+     * Returns a promise that will be fulfilled when the desired size to fill the stream’s internal queue transitions
+     * from non-positive to positive, signaling that it is no longer applying backpressure. Once the desired size dips
+     * back to zero or below, the getter will return a new promise that stays pending until the next transition.
+     *
+     * If the stream becomes errored or aborted, or the writer’s lock is released, the returned promise will become
+     * rejected.
+     */
+    get ready() {
+        if (!IsWritableStreamDefaultWriter(this)) {
+            return promiseRejectedWith(defaultWriterBrandCheckException('ready'));
+        }
+        return this._readyPromise;
+    }
+    /**
+     * If the reader is active, behaves the same as {@link WritableStream.abort | stream.abort(reason)}.
+     */
+    abort(reason = undefined) {
+        if (!IsWritableStreamDefaultWriter(this)) {
+            return promiseRejectedWith(defaultWriterBrandCheckException('abort'));
+        }
+        if (this._ownerWritableStream === undefined) {
+            return promiseRejectedWith(defaultWriterLockException('abort'));
+        }
+        return WritableStreamDefaultWriterAbort(this, reason);
+    }
+    /**
+     * If the reader is active, behaves the same as {@link WritableStream.close | stream.close()}.
+     */
+    close() {
+        if (!IsWritableStreamDefaultWriter(this)) {
+            return promiseRejectedWith(defaultWriterBrandCheckException('close'));
+        }
+        const stream = this._ownerWritableStream;
+        if (stream === undefined) {
+            return promiseRejectedWith(defaultWriterLockException('close'));
+        }
+        if (WritableStreamCloseQueuedOrInFlight(stream)) {
+            return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));
+        }
+        return WritableStreamDefaultWriterClose(this);
+    }
+    /**
+     * Releases the writer’s lock on the corresponding stream. After the lock is released, the writer is no longer active.
+     * If the associated stream is errored when the lock is released, the writer will appear errored in the same way from
+     * now on; otherwise, the writer will appear closed.
+     *
+     * Note that the lock can still be released even if some ongoing writes have not yet finished (i.e. even if the
+     * promises returned from previous calls to {@link WritableStreamDefaultWriter.write | write()} have not yet settled).
+     * It’s not necessary to hold the lock on the writer for the duration of the write; the lock instead simply prevents
+     * other producers from writing in an interleaved manner.
+     */
+    releaseLock() {
+        if (!IsWritableStreamDefaultWriter(this)) {
+            throw defaultWriterBrandCheckException('releaseLock');
+        }
+        const stream = this._ownerWritableStream;
+        if (stream === undefined) {
+            return;
+        }
+        WritableStreamDefaultWriterRelease(this);
+    }
+    write(chunk = undefined) {
+        if (!IsWritableStreamDefaultWriter(this)) {
+            return promiseRejectedWith(defaultWriterBrandCheckException('write'));
+        }
+        if (this._ownerWritableStream === undefined) {
+            return promiseRejectedWith(defaultWriterLockException('write to'));
+        }
+        return WritableStreamDefaultWriterWrite(this, chunk);
+    }
+}
+Object.defineProperties(WritableStreamDefaultWriter.prototype, {
+    abort: { enumerable: true },
+    close: { enumerable: true },
+    releaseLock: { enumerable: true },
+    write: { enumerable: true },
+    closed: { enumerable: true },
+    desiredSize: { enumerable: true },
+    ready: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(WritableStreamDefaultWriter.prototype, SymbolPolyfill.toStringTag, {
+        value: 'WritableStreamDefaultWriter',
+        configurable: true
+    });
+}
+// Abstract operations for the WritableStreamDefaultWriter.
+function IsWritableStreamDefaultWriter(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) {
+        return false;
+    }
+    return x instanceof WritableStreamDefaultWriter;
+}
+// A client of WritableStreamDefaultWriter may use these functions directly to bypass state check.
+function WritableStreamDefaultWriterAbort(writer, reason) {
+    const stream = writer._ownerWritableStream;
+    return WritableStreamAbort(stream, reason);
+}
+function WritableStreamDefaultWriterClose(writer) {
+    const stream = writer._ownerWritableStream;
+    return WritableStreamClose(stream);
+}
+function WritableStreamDefaultWriterCloseWithErrorPropagation(writer) {
+    const stream = writer._ownerWritableStream;
+    const state = stream._state;
+    if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {
+        return promiseResolvedWith(undefined);
+    }
+    if (state === 'errored') {
+        return promiseRejectedWith(stream._storedError);
+    }
+    return WritableStreamDefaultWriterClose(writer);
+}
+function WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, error) {
+    if (writer._closedPromiseState === 'pending') {
+        defaultWriterClosedPromiseReject(writer, error);
+    }
+    else {
+        defaultWriterClosedPromiseResetToRejected(writer, error);
+    }
+}
+function WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, error) {
+    if (writer._readyPromiseState === 'pending') {
+        defaultWriterReadyPromiseReject(writer, error);
+    }
+    else {
+        defaultWriterReadyPromiseResetToRejected(writer, error);
+    }
+}
+function WritableStreamDefaultWriterGetDesiredSize(writer) {
+    const stream = writer._ownerWritableStream;
+    const state = stream._state;
+    if (state === 'errored' || state === 'erroring') {
+        return null;
+    }
+    if (state === 'closed') {
+        return 0;
+    }
+    return WritableStreamDefaultControllerGetDesiredSize(stream._writableStreamController);
+}
+function WritableStreamDefaultWriterRelease(writer) {
+    const stream = writer._ownerWritableStream;
+    const releasedError = new TypeError(`Writer was released and can no longer be used to monitor the stream's closedness`);
+    WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, releasedError);
+    // The state transitions to "errored" before the sink abort() method runs, but the writer.closed promise is not
+    // rejected until afterwards. This means that simply testing state will not work.
+    WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, releasedError);
+    stream._writer = undefined;
+    writer._ownerWritableStream = undefined;
+}
+function WritableStreamDefaultWriterWrite(writer, chunk) {
+    const stream = writer._ownerWritableStream;
+    const controller = stream._writableStreamController;
+    const chunkSize = WritableStreamDefaultControllerGetChunkSize(controller, chunk);
+    if (stream !== writer._ownerWritableStream) {
+        return promiseRejectedWith(defaultWriterLockException('write to'));
+    }
+    const state = stream._state;
+    if (state === 'errored') {
+        return promiseRejectedWith(stream._storedError);
+    }
+    if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {
+        return promiseRejectedWith(new TypeError('The stream is closing or closed and cannot be written to'));
+    }
+    if (state === 'erroring') {
+        return promiseRejectedWith(stream._storedError);
+    }
+    const promise = WritableStreamAddWriteRequest(stream);
+    WritableStreamDefaultControllerWrite(controller, chunk, chunkSize);
+    return promise;
+}
+const closeSentinel = {};
+/**
+ * Allows control of a {@link WritableStream | writable stream}'s state and internal queue.
+ *
+ * @public
+ */
+class WritableStreamDefaultController {
+    constructor() {
+        throw new TypeError('Illegal constructor');
+    }
+    /**
+     * The reason which was passed to `WritableStream.abort(reason)` when the stream was aborted.
+     *
+     * @deprecated
+     *  This property has been removed from the specification, see https://github.com/whatwg/streams/pull/1177.
+     *  Use {@link WritableStreamDefaultController.signal}'s `reason` instead.
+     */
+    get abortReason() {
+        if (!IsWritableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$2('abortReason');
+        }
+        return this._abortReason;
+    }
+    /**
+     * An `AbortSignal` that can be used to abort the pending write or close operation when the stream is aborted.
+     */
+    get signal() {
+        if (!IsWritableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$2('signal');
+        }
+        if (this._abortController === undefined) {
+            // Older browsers or older Node versions may not support `AbortController` or `AbortSignal`.
+            // We don't want to bundle and ship an `AbortController` polyfill together with our polyfill,
+            // so instead we only implement support for `signal` if we find a global `AbortController` constructor.
+            throw new TypeError('WritableStreamDefaultController.prototype.signal is not supported');
+        }
+        return this._abortController.signal;
+    }
+    /**
+     * Closes the controlled writable stream, making all future interactions with it fail with the given error `e`.
+     *
+     * This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying
+     * sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the
+     * normal lifecycle of interactions with the underlying sink.
+     */
+    error(e = undefined) {
+        if (!IsWritableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$2('error');
+        }
+        const state = this._controlledWritableStream._state;
+        if (state !== 'writable') {
+            // The stream is closed, errored or will be soon. The sink can't do anything useful if it gets an error here, so
+            // just treat it as a no-op.
+            return;
+        }
+        WritableStreamDefaultControllerError(this, e);
+    }
+    /** @internal */
+    [AbortSteps](reason) {
+        const result = this._abortAlgorithm(reason);
+        WritableStreamDefaultControllerClearAlgorithms(this);
+        return result;
+    }
+    /** @internal */
+    [ErrorSteps]() {
+        ResetQueue(this);
+    }
+}
+Object.defineProperties(WritableStreamDefaultController.prototype, {
+    abortReason: { enumerable: true },
+    signal: { enumerable: true },
+    error: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(WritableStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+        value: 'WritableStreamDefaultController',
+        configurable: true
+    });
+}
+// Abstract operations implementing interface required by the WritableStream.
+function IsWritableStreamDefaultController(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_controlledWritableStream')) {
+        return false;
+    }
+    return x instanceof WritableStreamDefaultController;
+}
+function SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm) {
+    controller._controlledWritableStream = stream;
+    stream._writableStreamController = controller;
+    // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.
+    controller._queue = undefined;
+    controller._queueTotalSize = undefined;
+    ResetQueue(controller);
+    controller._abortReason = undefined;
+    controller._abortController = createAbortController();
+    controller._started = false;
+    controller._strategySizeAlgorithm = sizeAlgorithm;
+    controller._strategyHWM = highWaterMark;
+    controller._writeAlgorithm = writeAlgorithm;
+    controller._closeAlgorithm = closeAlgorithm;
+    controller._abortAlgorithm = abortAlgorithm;
+    const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+    WritableStreamUpdateBackpressure(stream, backpressure);
+    const startResult = startAlgorithm();
+    const startPromise = promiseResolvedWith(startResult);
+    uponPromise(startPromise, () => {
+        controller._started = true;
+        WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+    }, r => {
+        controller._started = true;
+        WritableStreamDealWithRejection(stream, r);
+    });
+}
+function SetUpWritableStreamDefaultControllerFromUnderlyingSink(stream, underlyingSink, highWaterMark, sizeAlgorithm) {
+    const controller = Object.create(WritableStreamDefaultController.prototype);
+    let startAlgorithm = () => undefined;
+    let writeAlgorithm = () => promiseResolvedWith(undefined);
+    let closeAlgorithm = () => promiseResolvedWith(undefined);
+    let abortAlgorithm = () => promiseResolvedWith(undefined);
+    if (underlyingSink.start !== undefined) {
+        startAlgorithm = () => underlyingSink.start(controller);
+    }
+    if (underlyingSink.write !== undefined) {
+        writeAlgorithm = chunk => underlyingSink.write(chunk, controller);
+    }
+    if (underlyingSink.close !== undefined) {
+        closeAlgorithm = () => underlyingSink.close();
+    }
+    if (underlyingSink.abort !== undefined) {
+        abortAlgorithm = reason => underlyingSink.abort(reason);
+    }
+    SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm);
+}
+// ClearAlgorithms may be called twice. Erroring the same stream in multiple ways will often result in redundant calls.
+function WritableStreamDefaultControllerClearAlgorithms(controller) {
+    controller._writeAlgorithm = undefined;
+    controller._closeAlgorithm = undefined;
+    controller._abortAlgorithm = undefined;
+    controller._strategySizeAlgorithm = undefined;
+}
+function WritableStreamDefaultControllerClose(controller) {
+    EnqueueValueWithSize(controller, closeSentinel, 0);
+    WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+}
+function WritableStreamDefaultControllerGetChunkSize(controller, chunk) {
+    try {
+        return controller._strategySizeAlgorithm(chunk);
+    }
+    catch (chunkSizeE) {
+        WritableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE);
+        return 1;
+    }
+}
+function WritableStreamDefaultControllerGetDesiredSize(controller) {
+    return controller._strategyHWM - controller._queueTotalSize;
+}
+function WritableStreamDefaultControllerWrite(controller, chunk, chunkSize) {
+    try {
+        EnqueueValueWithSize(controller, chunk, chunkSize);
+    }
+    catch (enqueueE) {
+        WritableStreamDefaultControllerErrorIfNeeded(controller, enqueueE);
+        return;
+    }
+    const stream = controller._controlledWritableStream;
+    if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._state === 'writable') {
+        const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+        WritableStreamUpdateBackpressure(stream, backpressure);
+    }
+    WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+}
+// Abstract operations for the WritableStreamDefaultController.
+function WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller) {
+    const stream = controller._controlledWritableStream;
+    if (!controller._started) {
+        return;
+    }
+    if (stream._inFlightWriteRequest !== undefined) {
+        return;
+    }
+    const state = stream._state;
+    if (state === 'erroring') {
+        WritableStreamFinishErroring(stream);
+        return;
+    }
+    if (controller._queue.length === 0) {
+        return;
+    }
+    const value = PeekQueueValue(controller);
+    if (value === closeSentinel) {
+        WritableStreamDefaultControllerProcessClose(controller);
+    }
+    else {
+        WritableStreamDefaultControllerProcessWrite(controller, value);
+    }
+}
+function WritableStreamDefaultControllerErrorIfNeeded(controller, error) {
+    if (controller._controlledWritableStream._state === 'writable') {
+        WritableStreamDefaultControllerError(controller, error);
+    }
+}
+function WritableStreamDefaultControllerProcessClose(controller) {
+    const stream = controller._controlledWritableStream;
+    WritableStreamMarkCloseRequestInFlight(stream);
+    DequeueValue(controller);
+    const sinkClosePromise = controller._closeAlgorithm();
+    WritableStreamDefaultControllerClearAlgorithms(controller);
+    uponPromise(sinkClosePromise, () => {
+        WritableStreamFinishInFlightClose(stream);
+    }, reason => {
+        WritableStreamFinishInFlightCloseWithError(stream, reason);
+    });
+}
+function WritableStreamDefaultControllerProcessWrite(controller, chunk) {
+    const stream = controller._controlledWritableStream;
+    WritableStreamMarkFirstWriteRequestInFlight(stream);
+    const sinkWritePromise = controller._writeAlgorithm(chunk);
+    uponPromise(sinkWritePromise, () => {
+        WritableStreamFinishInFlightWrite(stream);
+        const state = stream._state;
+        DequeueValue(controller);
+        if (!WritableStreamCloseQueuedOrInFlight(stream) && state === 'writable') {
+            const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+            WritableStreamUpdateBackpressure(stream, backpressure);
+        }
+        WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+    }, reason => {
+        if (stream._state === 'writable') {
+            WritableStreamDefaultControllerClearAlgorithms(controller);
+        }
+        WritableStreamFinishInFlightWriteWithError(stream, reason);
+    });
+}
+function WritableStreamDefaultControllerGetBackpressure(controller) {
+    const desiredSize = WritableStreamDefaultControllerGetDesiredSize(controller);
+    return desiredSize <= 0;
+}
+// A client of WritableStreamDefaultController may use these functions directly to bypass state check.
+function WritableStreamDefaultControllerError(controller, error) {
+    const stream = controller._controlledWritableStream;
+    WritableStreamDefaultControllerClearAlgorithms(controller);
+    WritableStreamStartErroring(stream, error);
+}
+// Helper functions for the WritableStream.
+function streamBrandCheckException$2(name) {
+    return new TypeError(`WritableStream.prototype.${name} can only be used on a WritableStream`);
+}
+// Helper functions for the WritableStreamDefaultController.
+function defaultControllerBrandCheckException$2(name) {
+    return new TypeError(`WritableStreamDefaultController.prototype.${name} can only be used on a WritableStreamDefaultController`);
+}
+// Helper functions for the WritableStreamDefaultWriter.
+function defaultWriterBrandCheckException(name) {
+    return new TypeError(`WritableStreamDefaultWriter.prototype.${name} can only be used on a WritableStreamDefaultWriter`);
+}
+function defaultWriterLockException(name) {
+    return new TypeError('Cannot ' + name + ' a stream using a released writer');
+}
+function defaultWriterClosedPromiseInitialize(writer) {
+    writer._closedPromise = newPromise((resolve, reject) => {
+        writer._closedPromise_resolve = resolve;
+        writer._closedPromise_reject = reject;
+        writer._closedPromiseState = 'pending';
+    });
+}
+function defaultWriterClosedPromiseInitializeAsRejected(writer, reason) {
+    defaultWriterClosedPromiseInitialize(writer);
+    defaultWriterClosedPromiseReject(writer, reason);
+}
+function defaultWriterClosedPromiseInitializeAsResolved(writer) {
+    defaultWriterClosedPromiseInitialize(writer);
+    defaultWriterClosedPromiseResolve(writer);
+}
+function defaultWriterClosedPromiseReject(writer, reason) {
+    if (writer._closedPromise_reject === undefined) {
+        return;
+    }
+    setPromiseIsHandledToTrue(writer._closedPromise);
+    writer._closedPromise_reject(reason);
+    writer._closedPromise_resolve = undefined;
+    writer._closedPromise_reject = undefined;
+    writer._closedPromiseState = 'rejected';
+}
+function defaultWriterClosedPromiseResetToRejected(writer, reason) {
+    defaultWriterClosedPromiseInitializeAsRejected(writer, reason);
+}
+function defaultWriterClosedPromiseResolve(writer) {
+    if (writer._closedPromise_resolve === undefined) {
+        return;
+    }
+    writer._closedPromise_resolve(undefined);
+    writer._closedPromise_resolve = undefined;
+    writer._closedPromise_reject = undefined;
+    writer._closedPromiseState = 'resolved';
+}
+function defaultWriterReadyPromiseInitialize(writer) {
+    writer._readyPromise = newPromise((resolve, reject) => {
+        writer._readyPromise_resolve = resolve;
+        writer._readyPromise_reject = reject;
+    });
+    writer._readyPromiseState = 'pending';
+}
+function defaultWriterReadyPromiseInitializeAsRejected(writer, reason) {
+    defaultWriterReadyPromiseInitialize(writer);
+    defaultWriterReadyPromiseReject(writer, reason);
+}
+function defaultWriterReadyPromiseInitializeAsResolved(writer) {
+    defaultWriterReadyPromiseInitialize(writer);
+    defaultWriterReadyPromiseResolve(writer);
+}
+function defaultWriterReadyPromiseReject(writer, reason) {
+    if (writer._readyPromise_reject === undefined) {
+        return;
+    }
+    setPromiseIsHandledToTrue(writer._readyPromise);
+    writer._readyPromise_reject(reason);
+    writer._readyPromise_resolve = undefined;
+    writer._readyPromise_reject = undefined;
+    writer._readyPromiseState = 'rejected';
+}
+function defaultWriterReadyPromiseReset(writer) {
+    defaultWriterReadyPromiseInitialize(writer);
+}
+function defaultWriterReadyPromiseResetToRejected(writer, reason) {
+    defaultWriterReadyPromiseInitializeAsRejected(writer, reason);
+}
+function defaultWriterReadyPromiseResolve(writer) {
+    if (writer._readyPromise_resolve === undefined) {
+        return;
+    }
+    writer._readyPromise_resolve(undefined);
+    writer._readyPromise_resolve = undefined;
+    writer._readyPromise_reject = undefined;
+    writer._readyPromiseState = 'fulfilled';
+}
+
+/// <reference lib="dom" />
+const NativeDOMException = typeof DOMException !== 'undefined' ? DOMException : undefined;
+
+/// <reference types="node" />
+function isDOMExceptionConstructor(ctor) {
+    if (!(typeof ctor === 'function' || typeof ctor === 'object')) {
+        return false;
+    }
+    try {
+        new ctor();
+        return true;
+    }
+    catch (_a) {
+        return false;
+    }
+}
+function createDOMExceptionPolyfill() {
+    // eslint-disable-next-line no-shadow
+    const ctor = function DOMException(message, name) {
+        this.message = message || '';
+        this.name = name || 'Error';
+        if (Error.captureStackTrace) {
+            Error.captureStackTrace(this, this.constructor);
+        }
+    };
+    ctor.prototype = Object.create(Error.prototype);
+    Object.defineProperty(ctor.prototype, 'constructor', { value: ctor, writable: true, configurable: true });
+    return ctor;
+}
+// eslint-disable-next-line no-redeclare
+const DOMException$1 = isDOMExceptionConstructor(NativeDOMException) ? NativeDOMException : createDOMExceptionPolyfill();
+
+function ReadableStreamPipeTo(source, dest, preventClose, preventAbort, preventCancel, signal) {
+    const reader = AcquireReadableStreamDefaultReader(source);
+    const writer = AcquireWritableStreamDefaultWriter(dest);
+    source._disturbed = true;
+    let shuttingDown = false;
+    // This is used to keep track of the spec's requirement that we wait for ongoing writes during shutdown.
+    let currentWrite = promiseResolvedWith(undefined);
+    return newPromise((resolve, reject) => {
+        let abortAlgorithm;
+        if (signal !== undefined) {
+            abortAlgorithm = () => {
+                const error = new DOMException$1('Aborted', 'AbortError');
+                const actions = [];
+                if (!preventAbort) {
+                    actions.push(() => {
+                        if (dest._state === 'writable') {
+                            return WritableStreamAbort(dest, error);
+                        }
+                        return promiseResolvedWith(undefined);
+                    });
+                }
+                if (!preventCancel) {
+                    actions.push(() => {
+                        if (source._state === 'readable') {
+                            return ReadableStreamCancel(source, error);
+                        }
+                        return promiseResolvedWith(undefined);
+                    });
+                }
+                shutdownWithAction(() => Promise.all(actions.map(action => action())), true, error);
+            };
+            if (signal.aborted) {
+                abortAlgorithm();
+                return;
+            }
+            signal.addEventListener('abort', abortAlgorithm);
+        }
+        // Using reader and writer, read all chunks from this and write them to dest
+        // - Backpressure must be enforced
+        // - Shutdown must stop all activity
+        function pipeLoop() {
+            return newPromise((resolveLoop, rejectLoop) => {
+                function next(done) {
+                    if (done) {
+                        resolveLoop();
+                    }
+                    else {
+                        // Use `PerformPromiseThen` instead of `uponPromise` to avoid
+                        // adding unnecessary `.catch(rethrowAssertionErrorRejection)` handlers
+                        PerformPromiseThen(pipeStep(), next, rejectLoop);
+                    }
+                }
+                next(false);
+            });
+        }
+        function pipeStep() {
+            if (shuttingDown) {
+                return promiseResolvedWith(true);
+            }
+            return PerformPromiseThen(writer._readyPromise, () => {
+                return newPromise((resolveRead, rejectRead) => {
+                    ReadableStreamDefaultReaderRead(reader, {
+                        _chunkSteps: chunk => {
+                            currentWrite = PerformPromiseThen(WritableStreamDefaultWriterWrite(writer, chunk), undefined, noop);
+                            resolveRead(false);
+                        },
+                        _closeSteps: () => resolveRead(true),
+                        _errorSteps: rejectRead
+                    });
+                });
+            });
+        }
+        // Errors must be propagated forward
+        isOrBecomesErrored(source, reader._closedPromise, storedError => {
+            if (!preventAbort) {
+                shutdownWithAction(() => WritableStreamAbort(dest, storedError), true, storedError);
+            }
+            else {
+                shutdown(true, storedError);
+            }
+        });
+        // Errors must be propagated backward
+        isOrBecomesErrored(dest, writer._closedPromise, storedError => {
+            if (!preventCancel) {
+                shutdownWithAction(() => ReadableStreamCancel(source, storedError), true, storedError);
+            }
+            else {
+                shutdown(true, storedError);
+            }
+        });
+        // Closing must be propagated forward
+        isOrBecomesClosed(source, reader._closedPromise, () => {
+            if (!preventClose) {
+                shutdownWithAction(() => WritableStreamDefaultWriterCloseWithErrorPropagation(writer));
+            }
+            else {
+                shutdown();
+            }
+        });
+        // Closing must be propagated backward
+        if (WritableStreamCloseQueuedOrInFlight(dest) || dest._state === 'closed') {
+            const destClosed = new TypeError('the destination writable stream closed before all data could be piped to it');
+            if (!preventCancel) {
+                shutdownWithAction(() => ReadableStreamCancel(source, destClosed), true, destClosed);
+            }
+            else {
+                shutdown(true, destClosed);
+            }
+        }
+        setPromiseIsHandledToTrue(pipeLoop());
+        function waitForWritesToFinish() {
+            // Another write may have started while we were waiting on this currentWrite, so we have to be sure to wait
+            // for that too.
+            const oldCurrentWrite = currentWrite;
+            return PerformPromiseThen(currentWrite, () => oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined);
+        }
+        function isOrBecomesErrored(stream, promise, action) {
+            if (stream._state === 'errored') {
+                action(stream._storedError);
+            }
+            else {
+                uponRejection(promise, action);
+            }
+        }
+        function isOrBecomesClosed(stream, promise, action) {
+            if (stream._state === 'closed') {
+                action();
+            }
+            else {
+                uponFulfillment(promise, action);
+            }
+        }
+        function shutdownWithAction(action, originalIsError, originalError) {
+            if (shuttingDown) {
+                return;
+            }
+            shuttingDown = true;
+            if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {
+                uponFulfillment(waitForWritesToFinish(), doTheRest);
+            }
+            else {
+                doTheRest();
+            }
+            function doTheRest() {
+                uponPromise(action(), () => finalize(originalIsError, originalError), newError => finalize(true, newError));
+            }
+        }
+        function shutdown(isError, error) {
+            if (shuttingDown) {
+                return;
+            }
+            shuttingDown = true;
+            if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {
+                uponFulfillment(waitForWritesToFinish(), () => finalize(isError, error));
+            }
+            else {
+                finalize(isError, error);
+            }
+        }
+        function finalize(isError, error) {
+            WritableStreamDefaultWriterRelease(writer);
+            ReadableStreamReaderGenericRelease(reader);
+            if (signal !== undefined) {
+                signal.removeEventListener('abort', abortAlgorithm);
+            }
+            if (isError) {
+                reject(error);
+            }
+            else {
+                resolve(undefined);
+            }
+        }
+    });
+}
+
+/**
+ * Allows control of a {@link ReadableStream | readable stream}'s state and internal queue.
+ *
+ * @public
+ */
+class ReadableStreamDefaultController {
+    constructor() {
+        throw new TypeError('Illegal constructor');
+    }
+    /**
+     * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is
+     * over-full. An underlying source ought to use this information to determine when and how to apply backpressure.
+     */
+    get desiredSize() {
+        if (!IsReadableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$1('desiredSize');
+        }
+        return ReadableStreamDefaultControllerGetDesiredSize(this);
+    }
+    /**
+     * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from
+     * the stream, but once those are read, the stream will become closed.
+     */
+    close() {
+        if (!IsReadableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$1('close');
+        }
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {
+            throw new TypeError('The stream is not in a state that permits close');
+        }
+        ReadableStreamDefaultControllerClose(this);
+    }
+    enqueue(chunk = undefined) {
+        if (!IsReadableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$1('enqueue');
+        }
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {
+            throw new TypeError('The stream is not in a state that permits enqueue');
+        }
+        return ReadableStreamDefaultControllerEnqueue(this, chunk);
+    }
+    /**
+     * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.
+     */
+    error(e = undefined) {
+        if (!IsReadableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$1('error');
+        }
+        ReadableStreamDefaultControllerError(this, e);
+    }
+    /** @internal */
+    [CancelSteps](reason) {
+        ResetQueue(this);
+        const result = this._cancelAlgorithm(reason);
+        ReadableStreamDefaultControllerClearAlgorithms(this);
+        return result;
+    }
+    /** @internal */
+    [PullSteps](readRequest) {
+        const stream = this._controlledReadableStream;
+        if (this._queue.length > 0) {
+            const chunk = DequeueValue(this);
+            if (this._closeRequested && this._queue.length === 0) {
+                ReadableStreamDefaultControllerClearAlgorithms(this);
+                ReadableStreamClose(stream);
+            }
+            else {
+                ReadableStreamDefaultControllerCallPullIfNeeded(this);
+            }
+            readRequest._chunkSteps(chunk);
+        }
+        else {
+            ReadableStreamAddReadRequest(stream, readRequest);
+            ReadableStreamDefaultControllerCallPullIfNeeded(this);
+        }
+    }
+}
+Object.defineProperties(ReadableStreamDefaultController.prototype, {
+    close: { enumerable: true },
+    enqueue: { enumerable: true },
+    error: { enumerable: true },
+    desiredSize: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableStreamDefaultController',
+        configurable: true
+    });
+}
+// Abstract operations for the ReadableStreamDefaultController.
+function IsReadableStreamDefaultController(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableStream')) {
+        return false;
+    }
+    return x instanceof ReadableStreamDefaultController;
+}
+function ReadableStreamDefaultControllerCallPullIfNeeded(controller) {
+    const shouldPull = ReadableStreamDefaultControllerShouldCallPull(controller);
+    if (!shouldPull) {
+        return;
+    }
+    if (controller._pulling) {
+        controller._pullAgain = true;
+        return;
+    }
+    controller._pulling = true;
+    const pullPromise = controller._pullAlgorithm();
+    uponPromise(pullPromise, () => {
+        controller._pulling = false;
+        if (controller._pullAgain) {
+            controller._pullAgain = false;
+            ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+        }
+    }, e => {
+        ReadableStreamDefaultControllerError(controller, e);
+    });
+}
+function ReadableStreamDefaultControllerShouldCallPull(controller) {
+    const stream = controller._controlledReadableStream;
+    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+        return false;
+    }
+    if (!controller._started) {
+        return false;
+    }
+    if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+        return true;
+    }
+    const desiredSize = ReadableStreamDefaultControllerGetDesiredSize(controller);
+    if (desiredSize > 0) {
+        return true;
+    }
+    return false;
+}
+function ReadableStreamDefaultControllerClearAlgorithms(controller) {
+    controller._pullAlgorithm = undefined;
+    controller._cancelAlgorithm = undefined;
+    controller._strategySizeAlgorithm = undefined;
+}
+// A client of ReadableStreamDefaultController may use these functions directly to bypass state check.
+function ReadableStreamDefaultControllerClose(controller) {
+    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+        return;
+    }
+    const stream = controller._controlledReadableStream;
+    controller._closeRequested = true;
+    if (controller._queue.length === 0) {
+        ReadableStreamDefaultControllerClearAlgorithms(controller);
+        ReadableStreamClose(stream);
+    }
+}
+function ReadableStreamDefaultControllerEnqueue(controller, chunk) {
+    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+        return;
+    }
+    const stream = controller._controlledReadableStream;
+    if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+        ReadableStreamFulfillReadRequest(stream, chunk, false);
+    }
+    else {
+        let chunkSize;
+        try {
+            chunkSize = controller._strategySizeAlgorithm(chunk);
+        }
+        catch (chunkSizeE) {
+            ReadableStreamDefaultControllerError(controller, chunkSizeE);
+            throw chunkSizeE;
+        }
+        try {
+            EnqueueValueWithSize(controller, chunk, chunkSize);
+        }
+        catch (enqueueE) {
+            ReadableStreamDefaultControllerError(controller, enqueueE);
+            throw enqueueE;
+        }
+    }
+    ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+}
+function ReadableStreamDefaultControllerError(controller, e) {
+    const stream = controller._controlledReadableStream;
+    if (stream._state !== 'readable') {
+        return;
+    }
+    ResetQueue(controller);
+    ReadableStreamDefaultControllerClearAlgorithms(controller);
+    ReadableStreamError(stream, e);
+}
+function ReadableStreamDefaultControllerGetDesiredSize(controller) {
+    const state = controller._controlledReadableStream._state;
+    if (state === 'errored') {
+        return null;
+    }
+    if (state === 'closed') {
+        return 0;
+    }
+    return controller._strategyHWM - controller._queueTotalSize;
+}
+// This is used in the implementation of TransformStream.
+function ReadableStreamDefaultControllerHasBackpressure(controller) {
+    if (ReadableStreamDefaultControllerShouldCallPull(controller)) {
+        return false;
+    }
+    return true;
+}
+function ReadableStreamDefaultControllerCanCloseOrEnqueue(controller) {
+    const state = controller._controlledReadableStream._state;
+    if (!controller._closeRequested && state === 'readable') {
+        return true;
+    }
+    return false;
+}
+function SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm) {
+    controller._controlledReadableStream = stream;
+    controller._queue = undefined;
+    controller._queueTotalSize = undefined;
+    ResetQueue(controller);
+    controller._started = false;
+    controller._closeRequested = false;
+    controller._pullAgain = false;
+    controller._pulling = false;
+    controller._strategySizeAlgorithm = sizeAlgorithm;
+    controller._strategyHWM = highWaterMark;
+    controller._pullAlgorithm = pullAlgorithm;
+    controller._cancelAlgorithm = cancelAlgorithm;
+    stream._readableStreamController = controller;
+    const startResult = startAlgorithm();
+    uponPromise(promiseResolvedWith(startResult), () => {
+        controller._started = true;
+        ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+    }, r => {
+        ReadableStreamDefaultControllerError(controller, r);
+    });
+}
+function SetUpReadableStreamDefaultControllerFromUnderlyingSource(stream, underlyingSource, highWaterMark, sizeAlgorithm) {
+    const controller = Object.create(ReadableStreamDefaultController.prototype);
+    let startAlgorithm = () => undefined;
+    let pullAlgorithm = () => promiseResolvedWith(undefined);
+    let cancelAlgorithm = () => promiseResolvedWith(undefined);
+    if (underlyingSource.start !== undefined) {
+        startAlgorithm = () => underlyingSource.start(controller);
+    }
+    if (underlyingSource.pull !== undefined) {
+        pullAlgorithm = () => underlyingSource.pull(controller);
+    }
+    if (underlyingSource.cancel !== undefined) {
+        cancelAlgorithm = reason => underlyingSource.cancel(reason);
+    }
+    SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm);
+}
+// Helper functions for the ReadableStreamDefaultController.
+function defaultControllerBrandCheckException$1(name) {
+    return new TypeError(`ReadableStreamDefaultController.prototype.${name} can only be used on a ReadableStreamDefaultController`);
+}
+
+function ReadableStreamTee(stream, cloneForBranch2) {
+    if (IsReadableByteStreamController(stream._readableStreamController)) {
+        return ReadableByteStreamTee(stream);
+    }
+    return ReadableStreamDefaultTee(stream);
+}
+function ReadableStreamDefaultTee(stream, cloneForBranch2) {
+    const reader = AcquireReadableStreamDefaultReader(stream);
+    let reading = false;
+    let readAgain = false;
+    let canceled1 = false;
+    let canceled2 = false;
+    let reason1;
+    let reason2;
+    let branch1;
+    let branch2;
+    let resolveCancelPromise;
+    const cancelPromise = newPromise(resolve => {
+        resolveCancelPromise = resolve;
+    });
+    function pullAlgorithm() {
+        if (reading) {
+            readAgain = true;
+            return promiseResolvedWith(undefined);
+        }
+        reading = true;
+        const readRequest = {
+            _chunkSteps: chunk => {
+                // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                // successful synchronously-available reads get ahead of asynchronously-available errors.
+                queueMicrotask(() => {
+                    readAgain = false;
+                    const chunk1 = chunk;
+                    const chunk2 = chunk;
+                    // There is no way to access the cloning code right now in the reference implementation.
+                    // If we add one then we'll need an implementation for serializable objects.
+                    // if (!canceled2 && cloneForBranch2) {
+                    //   chunk2 = StructuredDeserialize(StructuredSerialize(chunk2));
+                    // }
+                    if (!canceled1) {
+                        ReadableStreamDefaultControllerEnqueue(branch1._readableStreamController, chunk1);
+                    }
+                    if (!canceled2) {
+                        ReadableStreamDefaultControllerEnqueue(branch2._readableStreamController, chunk2);
+                    }
+                    reading = false;
+                    if (readAgain) {
+                        pullAlgorithm();
+                    }
+                });
+            },
+            _closeSteps: () => {
+                reading = false;
+                if (!canceled1) {
+                    ReadableStreamDefaultControllerClose(branch1._readableStreamController);
+                }
+                if (!canceled2) {
+                    ReadableStreamDefaultControllerClose(branch2._readableStreamController);
+                }
+                if (!canceled1 || !canceled2) {
+                    resolveCancelPromise(undefined);
+                }
+            },
+            _errorSteps: () => {
+                reading = false;
+            }
+        };
+        ReadableStreamDefaultReaderRead(reader, readRequest);
+        return promiseResolvedWith(undefined);
+    }
+    function cancel1Algorithm(reason) {
+        canceled1 = true;
+        reason1 = reason;
+        if (canceled2) {
+            const compositeReason = CreateArrayFromList([reason1, reason2]);
+            const cancelResult = ReadableStreamCancel(stream, compositeReason);
+            resolveCancelPromise(cancelResult);
+        }
+        return cancelPromise;
+    }
+    function cancel2Algorithm(reason) {
+        canceled2 = true;
+        reason2 = reason;
+        if (canceled1) {
+            const compositeReason = CreateArrayFromList([reason1, reason2]);
+            const cancelResult = ReadableStreamCancel(stream, compositeReason);
+            resolveCancelPromise(cancelResult);
+        }
+        return cancelPromise;
+    }
+    function startAlgorithm() {
+        // do nothing
+    }
+    branch1 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel1Algorithm);
+    branch2 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel2Algorithm);
+    uponRejection(reader._closedPromise, (r) => {
+        ReadableStreamDefaultControllerError(branch1._readableStreamController, r);
+        ReadableStreamDefaultControllerError(branch2._readableStreamController, r);
+        if (!canceled1 || !canceled2) {
+            resolveCancelPromise(undefined);
+        }
+    });
+    return [branch1, branch2];
+}
+function ReadableByteStreamTee(stream) {
+    let reader = AcquireReadableStreamDefaultReader(stream);
+    let reading = false;
+    let readAgainForBranch1 = false;
+    let readAgainForBranch2 = false;
+    let canceled1 = false;
+    let canceled2 = false;
+    let reason1;
+    let reason2;
+    let branch1;
+    let branch2;
+    let resolveCancelPromise;
+    const cancelPromise = newPromise(resolve => {
+        resolveCancelPromise = resolve;
+    });
+    function forwardReaderError(thisReader) {
+        uponRejection(thisReader._closedPromise, r => {
+            if (thisReader !== reader) {
+                return;
+            }
+            ReadableByteStreamControllerError(branch1._readableStreamController, r);
+            ReadableByteStreamControllerError(branch2._readableStreamController, r);
+            if (!canceled1 || !canceled2) {
+                resolveCancelPromise(undefined);
+            }
+        });
+    }
+    function pullWithDefaultReader() {
+        if (IsReadableStreamBYOBReader(reader)) {
+            ReadableStreamReaderGenericRelease(reader);
+            reader = AcquireReadableStreamDefaultReader(stream);
+            forwardReaderError(reader);
+        }
+        const readRequest = {
+            _chunkSteps: chunk => {
+                // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                // successful synchronously-available reads get ahead of asynchronously-available errors.
+                queueMicrotask(() => {
+                    readAgainForBranch1 = false;
+                    readAgainForBranch2 = false;
+                    const chunk1 = chunk;
+                    let chunk2 = chunk;
+                    if (!canceled1 && !canceled2) {
+                        try {
+                            chunk2 = CloneAsUint8Array(chunk);
+                        }
+                        catch (cloneE) {
+                            ReadableByteStreamControllerError(branch1._readableStreamController, cloneE);
+                            ReadableByteStreamControllerError(branch2._readableStreamController, cloneE);
+                            resolveCancelPromise(ReadableStreamCancel(stream, cloneE));
+                            return;
+                        }
+                    }
+                    if (!canceled1) {
+                        ReadableByteStreamControllerEnqueue(branch1._readableStreamController, chunk1);
+                    }
+                    if (!canceled2) {
+                        ReadableByteStreamControllerEnqueue(branch2._readableStreamController, chunk2);
+                    }
+                    reading = false;
+                    if (readAgainForBranch1) {
+                        pull1Algorithm();
+                    }
+                    else if (readAgainForBranch2) {
+                        pull2Algorithm();
+                    }
+                });
+            },
+            _closeSteps: () => {
+                reading = false;
+                if (!canceled1) {
+                    ReadableByteStreamControllerClose(branch1._readableStreamController);
+                }
+                if (!canceled2) {
+                    ReadableByteStreamControllerClose(branch2._readableStreamController);
+                }
+                if (branch1._readableStreamController._pendingPullIntos.length > 0) {
+                    ReadableByteStreamControllerRespond(branch1._readableStreamController, 0);
+                }
+                if (branch2._readableStreamController._pendingPullIntos.length > 0) {
+                    ReadableByteStreamControllerRespond(branch2._readableStreamController, 0);
+                }
+                if (!canceled1 || !canceled2) {
+                    resolveCancelPromise(undefined);
+                }
+            },
+            _errorSteps: () => {
+                reading = false;
+            }
+        };
+        ReadableStreamDefaultReaderRead(reader, readRequest);
+    }
+    function pullWithBYOBReader(view, forBranch2) {
+        if (IsReadableStreamDefaultReader(reader)) {
+            ReadableStreamReaderGenericRelease(reader);
+            reader = AcquireReadableStreamBYOBReader(stream);
+            forwardReaderError(reader);
+        }
+        const byobBranch = forBranch2 ? branch2 : branch1;
+        const otherBranch = forBranch2 ? branch1 : branch2;
+        const readIntoRequest = {
+            _chunkSteps: chunk => {
+                // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                // successful synchronously-available reads get ahead of asynchronously-available errors.
+                queueMicrotask(() => {
+                    readAgainForBranch1 = false;
+                    readAgainForBranch2 = false;
+                    const byobCanceled = forBranch2 ? canceled2 : canceled1;
+                    const otherCanceled = forBranch2 ? canceled1 : canceled2;
+                    if (!otherCanceled) {
+                        let clonedChunk;
+                        try {
+                            clonedChunk = CloneAsUint8Array(chunk);
+                        }
+                        catch (cloneE) {
+                            ReadableByteStreamControllerError(byobBranch._readableStreamController, cloneE);
+                            ReadableByteStreamControllerError(otherBranch._readableStreamController, cloneE);
+                            resolveCancelPromise(ReadableStreamCancel(stream, cloneE));
+                            return;
+                        }
+                        if (!byobCanceled) {
+                            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                        }
+                        ReadableByteStreamControllerEnqueue(otherBranch._readableStreamController, clonedChunk);
+                    }
+                    else if (!byobCanceled) {
+                        ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                    }
+                    reading = false;
+                    if (readAgainForBranch1) {
+                        pull1Algorithm();
+                    }
+                    else if (readAgainForBranch2) {
+                        pull2Algorithm();
+                    }
+                });
+            },
+            _closeSteps: chunk => {
+                reading = false;
+                const byobCanceled = forBranch2 ? canceled2 : canceled1;
+                const otherCanceled = forBranch2 ? canceled1 : canceled2;
+                if (!byobCanceled) {
+                    ReadableByteStreamControllerClose(byobBranch._readableStreamController);
+                }
+                if (!otherCanceled) {
+                    ReadableByteStreamControllerClose(otherBranch._readableStreamController);
+                }
+                if (chunk !== undefined) {
+                    if (!byobCanceled) {
+                        ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                    }
+                    if (!otherCanceled && otherBranch._readableStreamController._pendingPullIntos.length > 0) {
+                        ReadableByteStreamControllerRespond(otherBranch._readableStreamController, 0);
+                    }
+                }
+                if (!byobCanceled || !otherCanceled) {
+                    resolveCancelPromise(undefined);
+                }
+            },
+            _errorSteps: () => {
+                reading = false;
+            }
+        };
+        ReadableStreamBYOBReaderRead(reader, view, readIntoRequest);
+    }
+    function pull1Algorithm() {
+        if (reading) {
+            readAgainForBranch1 = true;
+            return promiseResolvedWith(undefined);
+        }
+        reading = true;
+        const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch1._readableStreamController);
+        if (byobRequest === null) {
+            pullWithDefaultReader();
+        }
+        else {
+            pullWithBYOBReader(byobRequest._view, false);
+        }
+        return promiseResolvedWith(undefined);
+    }
+    function pull2Algorithm() {
+        if (reading) {
+            readAgainForBranch2 = true;
+            return promiseResolvedWith(undefined);
+        }
+        reading = true;
+        const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch2._readableStreamController);
+        if (byobRequest === null) {
+            pullWithDefaultReader();
+        }
+        else {
+            pullWithBYOBReader(byobRequest._view, true);
+        }
+        return promiseResolvedWith(undefined);
+    }
+    function cancel1Algorithm(reason) {
+        canceled1 = true;
+        reason1 = reason;
+        if (canceled2) {
+            const compositeReason = CreateArrayFromList([reason1, reason2]);
+            const cancelResult = ReadableStreamCancel(stream, compositeReason);
+            resolveCancelPromise(cancelResult);
+        }
+        return cancelPromise;
+    }
+    function cancel2Algorithm(reason) {
+        canceled2 = true;
+        reason2 = reason;
+        if (canceled1) {
+            const compositeReason = CreateArrayFromList([reason1, reason2]);
+            const cancelResult = ReadableStreamCancel(stream, compositeReason);
+            resolveCancelPromise(cancelResult);
+        }
+        return cancelPromise;
+    }
+    function startAlgorithm() {
+        return;
+    }
+    branch1 = CreateReadableByteStream(startAlgorithm, pull1Algorithm, cancel1Algorithm);
+    branch2 = CreateReadableByteStream(startAlgorithm, pull2Algorithm, cancel2Algorithm);
+    forwardReaderError(reader);
+    return [branch1, branch2];
+}
+
+function convertUnderlyingDefaultOrByteSource(source, context) {
+    assertDictionary(source, context);
+    const original = source;
+    const autoAllocateChunkSize = original === null || original === void 0 ? void 0 : original.autoAllocateChunkSize;
+    const cancel = original === null || original === void 0 ? void 0 : original.cancel;
+    const pull = original === null || original === void 0 ? void 0 : original.pull;
+    const start = original === null || original === void 0 ? void 0 : original.start;
+    const type = original === null || original === void 0 ? void 0 : original.type;
+    return {
+        autoAllocateChunkSize: autoAllocateChunkSize === undefined ?
+            undefined :
+            convertUnsignedLongLongWithEnforceRange(autoAllocateChunkSize, `${context} has member 'autoAllocateChunkSize' that`),
+        cancel: cancel === undefined ?
+            undefined :
+            convertUnderlyingSourceCancelCallback(cancel, original, `${context} has member 'cancel' that`),
+        pull: pull === undefined ?
+            undefined :
+            convertUnderlyingSourcePullCallback(pull, original, `${context} has member 'pull' that`),
+        start: start === undefined ?
+            undefined :
+            convertUnderlyingSourceStartCallback(start, original, `${context} has member 'start' that`),
+        type: type === undefined ? undefined : convertReadableStreamType(type, `${context} has member 'type' that`)
+    };
+}
+function convertUnderlyingSourceCancelCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (reason) => promiseCall(fn, original, [reason]);
+}
+function convertUnderlyingSourcePullCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (controller) => promiseCall(fn, original, [controller]);
+}
+function convertUnderlyingSourceStartCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (controller) => reflectCall(fn, original, [controller]);
+}
+function convertReadableStreamType(type, context) {
+    type = `${type}`;
+    if (type !== 'bytes') {
+        throw new TypeError(`${context} '${type}' is not a valid enumeration value for ReadableStreamType`);
+    }
+    return type;
+}
+
+function convertReaderOptions(options, context) {
+    assertDictionary(options, context);
+    const mode = options === null || options === void 0 ? void 0 : options.mode;
+    return {
+        mode: mode === undefined ? undefined : convertReadableStreamReaderMode(mode, `${context} has member 'mode' that`)
+    };
+}
+function convertReadableStreamReaderMode(mode, context) {
+    mode = `${mode}`;
+    if (mode !== 'byob') {
+        throw new TypeError(`${context} '${mode}' is not a valid enumeration value for ReadableStreamReaderMode`);
+    }
+    return mode;
+}
+
+function convertIteratorOptions(options, context) {
+    assertDictionary(options, context);
+    const preventCancel = options === null || options === void 0 ? void 0 : options.preventCancel;
+    return { preventCancel: Boolean(preventCancel) };
+}
+
+function convertPipeOptions(options, context) {
+    assertDictionary(options, context);
+    const preventAbort = options === null || options === void 0 ? void 0 : options.preventAbort;
+    const preventCancel = options === null || options === void 0 ? void 0 : options.preventCancel;
+    const preventClose = options === null || options === void 0 ? void 0 : options.preventClose;
+    const signal = options === null || options === void 0 ? void 0 : options.signal;
+    if (signal !== undefined) {
+        assertAbortSignal(signal, `${context} has member 'signal' that`);
+    }
+    return {
+        preventAbort: Boolean(preventAbort),
+        preventCancel: Boolean(preventCancel),
+        preventClose: Boolean(preventClose),
+        signal
+    };
+}
+function assertAbortSignal(signal, context) {
+    if (!isAbortSignal(signal)) {
+        throw new TypeError(`${context} is not an AbortSignal.`);
+    }
+}
+
+function convertReadableWritablePair(pair, context) {
+    assertDictionary(pair, context);
+    const readable = pair === null || pair === void 0 ? void 0 : pair.readable;
+    assertRequiredField(readable, 'readable', 'ReadableWritablePair');
+    assertReadableStream(readable, `${context} has member 'readable' that`);
+    const writable = pair === null || pair === void 0 ? void 0 : pair.writable;
+    assertRequiredField(writable, 'writable', 'ReadableWritablePair');
+    assertWritableStream(writable, `${context} has member 'writable' that`);
+    return { readable, writable };
+}
+
+/**
+ * A readable stream represents a source of data, from which you can read.
+ *
+ * @public
+ */
+class ReadableStream {
+    constructor(rawUnderlyingSource = {}, rawStrategy = {}) {
+        if (rawUnderlyingSource === undefined) {
+            rawUnderlyingSource = null;
+        }
+        else {
+            assertObject(rawUnderlyingSource, 'First parameter');
+        }
+        const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');
+        const underlyingSource = convertUnderlyingDefaultOrByteSource(rawUnderlyingSource, 'First parameter');
+        InitializeReadableStream(this);
+        if (underlyingSource.type === 'bytes') {
+            if (strategy.size !== undefined) {
+                throw new RangeError('The strategy for a byte stream cannot have a size function');
+            }
+            const highWaterMark = ExtractHighWaterMark(strategy, 0);
+            SetUpReadableByteStreamControllerFromUnderlyingSource(this, underlyingSource, highWaterMark);
+        }
+        else {
+            const sizeAlgorithm = ExtractSizeAlgorithm(strategy);
+            const highWaterMark = ExtractHighWaterMark(strategy, 1);
+            SetUpReadableStreamDefaultControllerFromUnderlyingSource(this, underlyingSource, highWaterMark, sizeAlgorithm);
+        }
+    }
+    /**
+     * Whether or not the readable stream is locked to a {@link ReadableStreamDefaultReader | reader}.
+     */
+    get locked() {
+        if (!IsReadableStream(this)) {
+            throw streamBrandCheckException$1('locked');
+        }
+        return IsReadableStreamLocked(this);
+    }
+    /**
+     * Cancels the stream, signaling a loss of interest in the stream by a consumer.
+     *
+     * The supplied `reason` argument will be given to the underlying source's {@link UnderlyingSource.cancel | cancel()}
+     * method, which might or might not use it.
+     */
+    cancel(reason = undefined) {
+        if (!IsReadableStream(this)) {
+            return promiseRejectedWith(streamBrandCheckException$1('cancel'));
+        }
+        if (IsReadableStreamLocked(this)) {
+            return promiseRejectedWith(new TypeError('Cannot cancel a stream that already has a reader'));
+        }
+        return ReadableStreamCancel(this, reason);
+    }
+    getReader(rawOptions = undefined) {
+        if (!IsReadableStream(this)) {
+            throw streamBrandCheckException$1('getReader');
+        }
+        const options = convertReaderOptions(rawOptions, 'First parameter');
+        if (options.mode === undefined) {
+            return AcquireReadableStreamDefaultReader(this);
+        }
+        return AcquireReadableStreamBYOBReader(this);
+    }
+    pipeThrough(rawTransform, rawOptions = {}) {
+        if (!IsReadableStream(this)) {
+            throw streamBrandCheckException$1('pipeThrough');
+        }
+        assertRequiredArgument(rawTransform, 1, 'pipeThrough');
+        const transform = convertReadableWritablePair(rawTransform, 'First parameter');
+        const options = convertPipeOptions(rawOptions, 'Second parameter');
+        if (IsReadableStreamLocked(this)) {
+            throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked ReadableStream');
+        }
+        if (IsWritableStreamLocked(transform.writable)) {
+            throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked WritableStream');
+        }
+        const promise = ReadableStreamPipeTo(this, transform.writable, options.preventClose, options.preventAbort, options.preventCancel, options.signal);
+        setPromiseIsHandledToTrue(promise);
+        return transform.readable;
+    }
+    pipeTo(destination, rawOptions = {}) {
+        if (!IsReadableStream(this)) {
+            return promiseRejectedWith(streamBrandCheckException$1('pipeTo'));
+        }
+        if (destination === undefined) {
+            return promiseRejectedWith(`Parameter 1 is required in 'pipeTo'.`);
+        }
+        if (!IsWritableStream(destination)) {
+            return promiseRejectedWith(new TypeError(`ReadableStream.prototype.pipeTo's first argument must be a WritableStream`));
+        }
+        let options;
+        try {
+            options = convertPipeOptions(rawOptions, 'Second parameter');
+        }
+        catch (e) {
+            return promiseRejectedWith(e);
+        }
+        if (IsReadableStreamLocked(this)) {
+            return promiseRejectedWith(new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream'));
+        }
+        if (IsWritableStreamLocked(destination)) {
+            return promiseRejectedWith(new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream'));
+        }
+        return ReadableStreamPipeTo(this, destination, options.preventClose, options.preventAbort, options.preventCancel, options.signal);
+    }
+    /**
+     * Tees this readable stream, returning a two-element array containing the two resulting branches as
+     * new {@link ReadableStream} instances.
+     *
+     * Teeing a stream will lock it, preventing any other consumer from acquiring a reader.
+     * To cancel the stream, cancel both of the resulting branches; a composite cancellation reason will then be
+     * propagated to the stream's underlying source.
+     *
+     * Note that the chunks seen in each branch will be the same object. If the chunks are not immutable,
+     * this could allow interference between the two branches.
+     */
+    tee() {
+        if (!IsReadableStream(this)) {
+            throw streamBrandCheckException$1('tee');
+        }
+        const branches = ReadableStreamTee(this);
+        return CreateArrayFromList(branches);
+    }
+    values(rawOptions = undefined) {
+        if (!IsReadableStream(this)) {
+            throw streamBrandCheckException$1('values');
+        }
+        const options = convertIteratorOptions(rawOptions, 'First parameter');
+        return AcquireReadableStreamAsyncIterator(this, options.preventCancel);
+    }
+}
+Object.defineProperties(ReadableStream.prototype, {
+    cancel: { enumerable: true },
+    getReader: { enumerable: true },
+    pipeThrough: { enumerable: true },
+    pipeTo: { enumerable: true },
+    tee: { enumerable: true },
+    values: { enumerable: true },
+    locked: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableStream.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableStream',
+        configurable: true
+    });
+}
+if (typeof SymbolPolyfill.asyncIterator === 'symbol') {
+    Object.defineProperty(ReadableStream.prototype, SymbolPolyfill.asyncIterator, {
+        value: ReadableStream.prototype.values,
+        writable: true,
+        configurable: true
+    });
+}
+// Abstract operations for the ReadableStream.
+// Throws if and only if startAlgorithm throws.
+function CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark = 1, sizeAlgorithm = () => 1) {
+    const stream = Object.create(ReadableStream.prototype);
+    InitializeReadableStream(stream);
+    const controller = Object.create(ReadableStreamDefaultController.prototype);
+    SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm);
+    return stream;
+}
+// Throws if and only if startAlgorithm throws.
+function CreateReadableByteStream(startAlgorithm, pullAlgorithm, cancelAlgorithm) {
+    const stream = Object.create(ReadableStream.prototype);
+    InitializeReadableStream(stream);
+    const controller = Object.create(ReadableByteStreamController.prototype);
+    SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, 0, undefined);
+    return stream;
+}
+function InitializeReadableStream(stream) {
+    stream._state = 'readable';
+    stream._reader = undefined;
+    stream._storedError = undefined;
+    stream._disturbed = false;
+}
+function IsReadableStream(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_readableStreamController')) {
+        return false;
+    }
+    return x instanceof ReadableStream;
+}
+function IsReadableStreamLocked(stream) {
+    if (stream._reader === undefined) {
+        return false;
+    }
+    return true;
+}
+// ReadableStream API exposed for controllers.
+function ReadableStreamCancel(stream, reason) {
+    stream._disturbed = true;
+    if (stream._state === 'closed') {
+        return promiseResolvedWith(undefined);
+    }
+    if (stream._state === 'errored') {
+        return promiseRejectedWith(stream._storedError);
+    }
+    ReadableStreamClose(stream);
+    const reader = stream._reader;
+    if (reader !== undefined && IsReadableStreamBYOBReader(reader)) {
+        reader._readIntoRequests.forEach(readIntoRequest => {
+            readIntoRequest._closeSteps(undefined);
+        });
+        reader._readIntoRequests = new SimpleQueue();
+    }
+    const sourceCancelPromise = stream._readableStreamController[CancelSteps](reason);
+    return transformPromiseWith(sourceCancelPromise, noop);
+}
+function ReadableStreamClose(stream) {
+    stream._state = 'closed';
+    const reader = stream._reader;
+    if (reader === undefined) {
+        return;
+    }
+    defaultReaderClosedPromiseResolve(reader);
+    if (IsReadableStreamDefaultReader(reader)) {
+        reader._readRequests.forEach(readRequest => {
+            readRequest._closeSteps();
+        });
+        reader._readRequests = new SimpleQueue();
+    }
+}
+function ReadableStreamError(stream, e) {
+    stream._state = 'errored';
+    stream._storedError = e;
+    const reader = stream._reader;
+    if (reader === undefined) {
+        return;
+    }
+    defaultReaderClosedPromiseReject(reader, e);
+    if (IsReadableStreamDefaultReader(reader)) {
+        reader._readRequests.forEach(readRequest => {
+            readRequest._errorSteps(e);
+        });
+        reader._readRequests = new SimpleQueue();
+    }
+    else {
+        reader._readIntoRequests.forEach(readIntoRequest => {
+            readIntoRequest._errorSteps(e);
+        });
+        reader._readIntoRequests = new SimpleQueue();
+    }
+}
+// Helper functions for the ReadableStream.
+function streamBrandCheckException$1(name) {
+    return new TypeError(`ReadableStream.prototype.${name} can only be used on a ReadableStream`);
+}
+
+function convertQueuingStrategyInit(init, context) {
+    assertDictionary(init, context);
+    const highWaterMark = init === null || init === void 0 ? void 0 : init.highWaterMark;
+    assertRequiredField(highWaterMark, 'highWaterMark', 'QueuingStrategyInit');
+    return {
+        highWaterMark: convertUnrestrictedDouble(highWaterMark)
+    };
+}
+
+// The size function must not have a prototype property nor be a constructor
+const byteLengthSizeFunction = (chunk) => {
+    return chunk.byteLength;
+};
+try {
+    Object.defineProperty(byteLengthSizeFunction, 'name', {
+        value: 'size',
+        configurable: true
+    });
+}
+catch (_a) {
+    // This property is non-configurable in older browsers, so ignore if this throws.
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility
+}
+/**
+ * A queuing strategy that counts the number of bytes in each chunk.
+ *
+ * @public
+ */
+class ByteLengthQueuingStrategy {
+    constructor(options) {
+        assertRequiredArgument(options, 1, 'ByteLengthQueuingStrategy');
+        options = convertQueuingStrategyInit(options, 'First parameter');
+        this._byteLengthQueuingStrategyHighWaterMark = options.highWaterMark;
+    }
+    /**
+     * Returns the high water mark provided to the constructor.
+     */
+    get highWaterMark() {
+        if (!IsByteLengthQueuingStrategy(this)) {
+            throw byteLengthBrandCheckException('highWaterMark');
+        }
+        return this._byteLengthQueuingStrategyHighWaterMark;
+    }
+    /**
+     * Measures the size of `chunk` by returning the value of its `byteLength` property.
+     */
+    get size() {
+        if (!IsByteLengthQueuingStrategy(this)) {
+            throw byteLengthBrandCheckException('size');
+        }
+        return byteLengthSizeFunction;
+    }
+}
+Object.defineProperties(ByteLengthQueuingStrategy.prototype, {
+    highWaterMark: { enumerable: true },
+    size: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ByteLengthQueuingStrategy.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ByteLengthQueuingStrategy',
+        configurable: true
+    });
+}
+// Helper functions for the ByteLengthQueuingStrategy.
+function byteLengthBrandCheckException(name) {
+    return new TypeError(`ByteLengthQueuingStrategy.prototype.${name} can only be used on a ByteLengthQueuingStrategy`);
+}
+function IsByteLengthQueuingStrategy(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_byteLengthQueuingStrategyHighWaterMark')) {
+        return false;
+    }
+    return x instanceof ByteLengthQueuingStrategy;
+}
+
+// The size function must not have a prototype property nor be a constructor
+const countSizeFunction = () => {
+    return 1;
+};
+try {
+    Object.defineProperty(countSizeFunction, 'name', {
+        value: 'size',
+        configurable: true
+    });
+}
+catch (_a) {
+    // This property is non-configurable in older browsers, so ignore if this throws.
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility
+}
+/**
+ * A queuing strategy that counts the number of chunks.
+ *
+ * @public
+ */
+class CountQueuingStrategy {
+    constructor(options) {
+        assertRequiredArgument(options, 1, 'CountQueuingStrategy');
+        options = convertQueuingStrategyInit(options, 'First parameter');
+        this._countQueuingStrategyHighWaterMark = options.highWaterMark;
+    }
+    /**
+     * Returns the high water mark provided to the constructor.
+     */
+    get highWaterMark() {
+        if (!IsCountQueuingStrategy(this)) {
+            throw countBrandCheckException('highWaterMark');
+        }
+        return this._countQueuingStrategyHighWaterMark;
+    }
+    /**
+     * Measures the size of `chunk` by always returning 1.
+     * This ensures that the total queue size is a count of the number of chunks in the queue.
+     */
+    get size() {
+        if (!IsCountQueuingStrategy(this)) {
+            throw countBrandCheckException('size');
+        }
+        return countSizeFunction;
+    }
+}
+Object.defineProperties(CountQueuingStrategy.prototype, {
+    highWaterMark: { enumerable: true },
+    size: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(CountQueuingStrategy.prototype, SymbolPolyfill.toStringTag, {
+        value: 'CountQueuingStrategy',
+        configurable: true
+    });
+}
+// Helper functions for the CountQueuingStrategy.
+function countBrandCheckException(name) {
+    return new TypeError(`CountQueuingStrategy.prototype.${name} can only be used on a CountQueuingStrategy`);
+}
+function IsCountQueuingStrategy(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_countQueuingStrategyHighWaterMark')) {
+        return false;
+    }
+    return x instanceof CountQueuingStrategy;
+}
+
+function convertTransformer(original, context) {
+    assertDictionary(original, context);
+    const flush = original === null || original === void 0 ? void 0 : original.flush;
+    const readableType = original === null || original === void 0 ? void 0 : original.readableType;
+    const start = original === null || original === void 0 ? void 0 : original.start;
+    const transform = original === null || original === void 0 ? void 0 : original.transform;
+    const writableType = original === null || original === void 0 ? void 0 : original.writableType;
+    return {
+        flush: flush === undefined ?
+            undefined :
+            convertTransformerFlushCallback(flush, original, `${context} has member 'flush' that`),
+        readableType,
+        start: start === undefined ?
+            undefined :
+            convertTransformerStartCallback(start, original, `${context} has member 'start' that`),
+        transform: transform === undefined ?
+            undefined :
+            convertTransformerTransformCallback(transform, original, `${context} has member 'transform' that`),
+        writableType
+    };
+}
+function convertTransformerFlushCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (controller) => promiseCall(fn, original, [controller]);
+}
+function convertTransformerStartCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (controller) => reflectCall(fn, original, [controller]);
+}
+function convertTransformerTransformCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (chunk, controller) => promiseCall(fn, original, [chunk, controller]);
+}
+
+// Class TransformStream
+/**
+ * A transform stream consists of a pair of streams: a {@link WritableStream | writable stream},
+ * known as its writable side, and a {@link ReadableStream | readable stream}, known as its readable side.
+ * In a manner specific to the transform stream in question, writes to the writable side result in new data being
+ * made available for reading from the readable side.
+ *
+ * @public
+ */
+class TransformStream {
+    constructor(rawTransformer = {}, rawWritableStrategy = {}, rawReadableStrategy = {}) {
+        if (rawTransformer === undefined) {
+            rawTransformer = null;
+        }
+        const writableStrategy = convertQueuingStrategy(rawWritableStrategy, 'Second parameter');
+        const readableStrategy = convertQueuingStrategy(rawReadableStrategy, 'Third parameter');
+        const transformer = convertTransformer(rawTransformer, 'First parameter');
+        if (transformer.readableType !== undefined) {
+            throw new RangeError('Invalid readableType specified');
+        }
+        if (transformer.writableType !== undefined) {
+            throw new RangeError('Invalid writableType specified');
+        }
+        const readableHighWaterMark = ExtractHighWaterMark(readableStrategy, 0);
+        const readableSizeAlgorithm = ExtractSizeAlgorithm(readableStrategy);
+        const writableHighWaterMark = ExtractHighWaterMark(writableStrategy, 1);
+        const writableSizeAlgorithm = ExtractSizeAlgorithm(writableStrategy);
+        let startPromise_resolve;
+        const startPromise = newPromise(resolve => {
+            startPromise_resolve = resolve;
+        });
+        InitializeTransformStream(this, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm);
+        SetUpTransformStreamDefaultControllerFromTransformer(this, transformer);
+        if (transformer.start !== undefined) {
+            startPromise_resolve(transformer.start(this._transformStreamController));
+        }
+        else {
+            startPromise_resolve(undefined);
+        }
+    }
+    /**
+     * The readable side of the transform stream.
+     */
+    get readable() {
+        if (!IsTransformStream(this)) {
+            throw streamBrandCheckException('readable');
+        }
+        return this._readable;
+    }
+    /**
+     * The writable side of the transform stream.
+     */
+    get writable() {
+        if (!IsTransformStream(this)) {
+            throw streamBrandCheckException('writable');
+        }
+        return this._writable;
+    }
+}
+Object.defineProperties(TransformStream.prototype, {
+    readable: { enumerable: true },
+    writable: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(TransformStream.prototype, SymbolPolyfill.toStringTag, {
+        value: 'TransformStream',
+        configurable: true
+    });
+}
+function InitializeTransformStream(stream, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm) {
+    function startAlgorithm() {
+        return startPromise;
+    }
+    function writeAlgorithm(chunk) {
+        return TransformStreamDefaultSinkWriteAlgorithm(stream, chunk);
+    }
+    function abortAlgorithm(reason) {
+        return TransformStreamDefaultSinkAbortAlgorithm(stream, reason);
+    }
+    function closeAlgorithm() {
+        return TransformStreamDefaultSinkCloseAlgorithm(stream);
+    }
+    stream._writable = CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, writableHighWaterMark, writableSizeAlgorithm);
+    function pullAlgorithm() {
+        return TransformStreamDefaultSourcePullAlgorithm(stream);
+    }
+    function cancelAlgorithm(reason) {
+        TransformStreamErrorWritableAndUnblockWrite(stream, reason);
+        return promiseResolvedWith(undefined);
+    }
+    stream._readable = CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, readableHighWaterMark, readableSizeAlgorithm);
+    // The [[backpressure]] slot is set to undefined so that it can be initialised by TransformStreamSetBackpressure.
+    stream._backpressure = undefined;
+    stream._backpressureChangePromise = undefined;
+    stream._backpressureChangePromise_resolve = undefined;
+    TransformStreamSetBackpressure(stream, true);
+    stream._transformStreamController = undefined;
+}
+function IsTransformStream(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_transformStreamController')) {
+        return false;
+    }
+    return x instanceof TransformStream;
+}
+// This is a no-op if both sides are already errored.
+function TransformStreamError(stream, e) {
+    ReadableStreamDefaultControllerError(stream._readable._readableStreamController, e);
+    TransformStreamErrorWritableAndUnblockWrite(stream, e);
+}
+function TransformStreamErrorWritableAndUnblockWrite(stream, e) {
+    TransformStreamDefaultControllerClearAlgorithms(stream._transformStreamController);
+    WritableStreamDefaultControllerErrorIfNeeded(stream._writable._writableStreamController, e);
+    if (stream._backpressure) {
+        // Pretend that pull() was called to permit any pending write() calls to complete. TransformStreamSetBackpressure()
+        // cannot be called from enqueue() or pull() once the ReadableStream is errored, so this will will be the final time
+        // _backpressure is set.
+        TransformStreamSetBackpressure(stream, false);
+    }
+}
+function TransformStreamSetBackpressure(stream, backpressure) {
+    // Passes also when called during construction.
+    if (stream._backpressureChangePromise !== undefined) {
+        stream._backpressureChangePromise_resolve();
+    }
+    stream._backpressureChangePromise = newPromise(resolve => {
+        stream._backpressureChangePromise_resolve = resolve;
+    });
+    stream._backpressure = backpressure;
+}
+// Class TransformStreamDefaultController
+/**
+ * Allows control of the {@link ReadableStream} and {@link WritableStream} of the associated {@link TransformStream}.
+ *
+ * @public
+ */
+class TransformStreamDefaultController {
+    constructor() {
+        throw new TypeError('Illegal constructor');
+    }
+    /**
+     * Returns the desired size to fill the readable side’s internal queue. It can be negative, if the queue is over-full.
+     */
+    get desiredSize() {
+        if (!IsTransformStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException('desiredSize');
+        }
+        const readableController = this._controlledTransformStream._readable._readableStreamController;
+        return ReadableStreamDefaultControllerGetDesiredSize(readableController);
+    }
+    enqueue(chunk = undefined) {
+        if (!IsTransformStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException('enqueue');
+        }
+        TransformStreamDefaultControllerEnqueue(this, chunk);
+    }
+    /**
+     * Errors both the readable side and the writable side of the controlled transform stream, making all future
+     * interactions with it fail with the given error `e`. Any chunks queued for transformation will be discarded.
+     */
+    error(reason = undefined) {
+        if (!IsTransformStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException('error');
+        }
+        TransformStreamDefaultControllerError(this, reason);
+    }
+    /**
+     * Closes the readable side and errors the writable side of the controlled transform stream. This is useful when the
+     * transformer only needs to consume a portion of the chunks written to the writable side.
+     */
+    terminate() {
+        if (!IsTransformStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException('terminate');
+        }
+        TransformStreamDefaultControllerTerminate(this);
+    }
+}
+Object.defineProperties(TransformStreamDefaultController.prototype, {
+    enqueue: { enumerable: true },
+    error: { enumerable: true },
+    terminate: { enumerable: true },
+    desiredSize: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(TransformStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+        value: 'TransformStreamDefaultController',
+        configurable: true
+    });
+}
+// Transform Stream Default Controller Abstract Operations
+function IsTransformStreamDefaultController(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_controlledTransformStream')) {
+        return false;
+    }
+    return x instanceof TransformStreamDefaultController;
+}
+function SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm) {
+    controller._controlledTransformStream = stream;
+    stream._transformStreamController = controller;
+    controller._transformAlgorithm = transformAlgorithm;
+    controller._flushAlgorithm = flushAlgorithm;
+}
+function SetUpTransformStreamDefaultControllerFromTransformer(stream, transformer) {
+    const controller = Object.create(TransformStreamDefaultController.prototype);
+    let transformAlgorithm = (chunk) => {
+        try {
+            TransformStreamDefaultControllerEnqueue(controller, chunk);
+            return promiseResolvedWith(undefined);
+        }
+        catch (transformResultE) {
+            return promiseRejectedWith(transformResultE);
+        }
+    };
+    let flushAlgorithm = () => promiseResolvedWith(undefined);
+    if (transformer.transform !== undefined) {
+        transformAlgorithm = chunk => transformer.transform(chunk, controller);
+    }
+    if (transformer.flush !== undefined) {
+        flushAlgorithm = () => transformer.flush(controller);
+    }
+    SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);
+}
+function TransformStreamDefaultControllerClearAlgorithms(controller) {
+    controller._transformAlgorithm = undefined;
+    controller._flushAlgorithm = undefined;
+}
+function TransformStreamDefaultControllerEnqueue(controller, chunk) {
+    const stream = controller._controlledTransformStream;
+    const readableController = stream._readable._readableStreamController;
+    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(readableController)) {
+        throw new TypeError('Readable side is not in a state that permits enqueue');
+    }
+    // We throttle transform invocations based on the backpressure of the ReadableStream, but we still
+    // accept TransformStreamDefaultControllerEnqueue() calls.
+    try {
+        ReadableStreamDefaultControllerEnqueue(readableController, chunk);
+    }
+    catch (e) {
+        // This happens when readableStrategy.size() throws.
+        TransformStreamErrorWritableAndUnblockWrite(stream, e);
+        throw stream._readable._storedError;
+    }
+    const backpressure = ReadableStreamDefaultControllerHasBackpressure(readableController);
+    if (backpressure !== stream._backpressure) {
+        TransformStreamSetBackpressure(stream, true);
+    }
+}
+function TransformStreamDefaultControllerError(controller, e) {
+    TransformStreamError(controller._controlledTransformStream, e);
+}
+function TransformStreamDefaultControllerPerformTransform(controller, chunk) {
+    const transformPromise = controller._transformAlgorithm(chunk);
+    return transformPromiseWith(transformPromise, undefined, r => {
+        TransformStreamError(controller._controlledTransformStream, r);
+        throw r;
+    });
+}
+function TransformStreamDefaultControllerTerminate(controller) {
+    const stream = controller._controlledTransformStream;
+    const readableController = stream._readable._readableStreamController;
+    ReadableStreamDefaultControllerClose(readableController);
+    const error = new TypeError('TransformStream terminated');
+    TransformStreamErrorWritableAndUnblockWrite(stream, error);
+}
+// TransformStreamDefaultSink Algorithms
+function TransformStreamDefaultSinkWriteAlgorithm(stream, chunk) {
+    const controller = stream._transformStreamController;
+    if (stream._backpressure) {
+        const backpressureChangePromise = stream._backpressureChangePromise;
+        return transformPromiseWith(backpressureChangePromise, () => {
+            const writable = stream._writable;
+            const state = writable._state;
+            if (state === 'erroring') {
+                throw writable._storedError;
+            }
+            return TransformStreamDefaultControllerPerformTransform(controller, chunk);
+        });
+    }
+    return TransformStreamDefaultControllerPerformTransform(controller, chunk);
+}
+function TransformStreamDefaultSinkAbortAlgorithm(stream, reason) {
+    // abort() is not called synchronously, so it is possible for abort() to be called when the stream is already
+    // errored.
+    TransformStreamError(stream, reason);
+    return promiseResolvedWith(undefined);
+}
+function TransformStreamDefaultSinkCloseAlgorithm(stream) {
+    // stream._readable cannot change after construction, so caching it across a call to user code is safe.
+    const readable = stream._readable;
+    const controller = stream._transformStreamController;
+    const flushPromise = controller._flushAlgorithm();
+    TransformStreamDefaultControllerClearAlgorithms(controller);
+    // Return a promise that is fulfilled with undefined on success.
+    return transformPromiseWith(flushPromise, () => {
+        if (readable._state === 'errored') {
+            throw readable._storedError;
+        }
+        ReadableStreamDefaultControllerClose(readable._readableStreamController);
+    }, r => {
+        TransformStreamError(stream, r);
+        throw readable._storedError;
+    });
+}
+// TransformStreamDefaultSource Algorithms
+function TransformStreamDefaultSourcePullAlgorithm(stream) {
+    // Invariant. Enforced by the promises returned by start() and pull().
+    TransformStreamSetBackpressure(stream, false);
+    // Prevent the next pull() call until there is backpressure.
+    return stream._backpressureChangePromise;
+}
+// Helper functions for the TransformStreamDefaultController.
+function defaultControllerBrandCheckException(name) {
+    return new TypeError(`TransformStreamDefaultController.prototype.${name} can only be used on a TransformStreamDefaultController`);
+}
+// Helper functions for the TransformStream.
+function streamBrandCheckException(name) {
+    return new TypeError(`TransformStream.prototype.${name} can only be used on a TransformStream`);
+}
+
+export { ByteLengthQueuingStrategy, CountQueuingStrategy, ReadableByteStreamController, ReadableStream, ReadableStreamBYOBReader, ReadableStreamBYOBRequest, ReadableStreamDefaultController, ReadableStreamDefaultReader, TransformStream, TransformStreamDefaultController, WritableStream, WritableStreamDefaultController, WritableStreamDefaultWriter };
+//# sourceMappingURL=ponyfill.es2018.mjs.map
diff --git a/node_modules/web-streams-polyfill/dist/ponyfill.es2018.mjs.map b/node_modules/web-streams-polyfill/dist/ponyfill.es2018.mjs.map
new file mode 100644
index 0000000..5057974
--- /dev/null
+++ b/node_modules/web-streams-polyfill/dist/ponyfill.es2018.mjs.map
@@ -0,0 +1 @@
+{"version":3,"file":"ponyfill.es2018.mjs","sources":["../src/stub/symbol.ts","../src/utils.ts","../src/lib/helpers/miscellaneous.ts","../src/lib/helpers/webidl.ts","../src/lib/simple-queue.ts","../src/lib/readable-stream/generic-reader.ts","../src/lib/abstract-ops/internal-methods.ts","../src/stub/number-isfinite.ts","../src/stub/math-trunc.ts","../src/lib/validators/basic.ts","../src/lib/validators/readable-stream.ts","../src/lib/readable-stream/default-reader.ts","../src/target/es2018/stub/async-iterator-prototype.ts","../src/lib/readable-stream/async-iterator.ts","../src/stub/number-isnan.ts","../src/lib/abstract-ops/ecmascript.ts","../src/lib/abstract-ops/miscellaneous.ts","../src/lib/abstract-ops/queue-with-sizes.ts","../src/lib/readable-stream/byte-stream-controller.ts","../src/lib/readable-stream/byob-reader.ts","../src/lib/abstract-ops/queuing-strategy.ts","../src/lib/validators/queuing-strategy.ts","../src/lib/validators/underlying-sink.ts","../src/lib/validators/writable-stream.ts","../src/lib/abort-signal.ts","../src/lib/writable-stream.ts","../src/stub/native.ts","../src/stub/dom-exception.ts","../src/lib/readable-stream/pipe.ts","../src/lib/readable-stream/default-controller.ts","../src/lib/readable-stream/tee.ts","../src/lib/validators/underlying-source.ts","../src/lib/validators/reader-options.ts","../src/lib/validators/iterator-options.ts","../src/lib/validators/pipe-options.ts","../src/lib/validators/readable-writable-pair.ts","../src/lib/readable-stream.ts","../src/lib/validators/queuing-strategy-init.ts","../src/lib/byte-length-queuing-strategy.ts","../src/lib/count-queuing-strategy.ts","../src/lib/validators/transformer.ts","../src/lib/transform-stream.ts"],"sourcesContent":["/// <reference lib=\"es2015.symbol\" />\n\nconst SymbolPolyfill: (description?: string) => symbol =\n  typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol' ?\n    Symbol :\n    description => `Symbol(${description})` as any as symbol;\n\nexport default SymbolPolyfill;\n","/// <reference lib=\"dom\" />\n\nexport function noop(): undefined {\n  return undefined;\n}\n\nfunction getGlobals() {\n  if (typeof self !== 'undefined') {\n    return self;\n  } else if (typeof window !== 'undefined') {\n    return window;\n  } else if (typeof global !== 'undefined') {\n    return global;\n  }\n  return undefined;\n}\n\nexport const globals = getGlobals();\n","import { noop } from '../../utils';\nimport { AssertionError } from '../../stub/assert';\n\nexport function typeIsObject(x: any): x is object {\n  return (typeof x === 'object' && x !== null) || typeof x === 'function';\n}\n\nexport const rethrowAssertionErrorRejection: (e: any) => void =\n  DEBUG ? e => {\n    // Used throughout the reference implementation, as `.catch(rethrowAssertionErrorRejection)`, to ensure any errors\n    // get shown. There are places in the spec where we do promise transformations and purposefully ignore or don't\n    // expect any errors, but assertion errors are always problematic.\n    if (e && e instanceof AssertionError) {\n      setTimeout(() => {\n        throw e;\n      }, 0);\n    }\n  } : noop;\n","import { globals } from '../../utils';\nimport { rethrowAssertionErrorRejection } from './miscellaneous';\nimport assert from '../../stub/assert';\n\nconst originalPromise = Promise;\nconst originalPromiseThen = Promise.prototype.then;\nconst originalPromiseResolve = Promise.resolve.bind(originalPromise);\nconst originalPromiseReject = Promise.reject.bind(originalPromise);\n\nexport function newPromise<T>(executor: (\n  resolve: (value: T | PromiseLike<T>) => void,\n  reject: (reason?: any) => void\n) => void): Promise<T> {\n  return new originalPromise(executor);\n}\n\nexport function promiseResolvedWith<T>(value: T | PromiseLike<T>): Promise<T> {\n  return originalPromiseResolve(value);\n}\n\nexport function promiseRejectedWith<T = never>(reason: any): Promise<T> {\n  return originalPromiseReject(reason);\n}\n\nexport function PerformPromiseThen<T, TResult1 = T, TResult2 = never>(\n  promise: Promise<T>,\n  onFulfilled?: (value: T) => TResult1 | PromiseLike<TResult1>,\n  onRejected?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2> {\n  // There doesn't appear to be any way to correctly emulate the behaviour from JavaScript, so this is just an\n  // approximation.\n  return originalPromiseThen.call(promise, onFulfilled, onRejected) as Promise<TResult1 | TResult2>;\n}\n\nexport function uponPromise<T>(\n  promise: Promise<T>,\n  onFulfilled?: (value: T) => void | PromiseLike<void>,\n  onRejected?: (reason: any) => void | PromiseLike<void>): void {\n  PerformPromiseThen(\n    PerformPromiseThen(promise, onFulfilled, onRejected),\n    undefined,\n    rethrowAssertionErrorRejection\n  );\n}\n\nexport function uponFulfillment<T>(promise: Promise<T>, onFulfilled: (value: T) => void | PromiseLike<void>): void {\n  uponPromise(promise, onFulfilled);\n}\n\nexport function uponRejection(promise: Promise<unknown>, onRejected: (reason: any) => void | PromiseLike<void>): void {\n  uponPromise(promise, undefined, onRejected);\n}\n\nexport function transformPromiseWith<T, TResult1 = T, TResult2 = never>(\n  promise: Promise<T>,\n  fulfillmentHandler?: (value: T) => TResult1 | PromiseLike<TResult1>,\n  rejectionHandler?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2> {\n  return PerformPromiseThen(promise, fulfillmentHandler, rejectionHandler);\n}\n\nexport function setPromiseIsHandledToTrue(promise: Promise<unknown>): void {\n  PerformPromiseThen(promise, undefined, rethrowAssertionErrorRejection);\n}\n\nexport const queueMicrotask: (fn: () => void) => void = (() => {\n  const globalQueueMicrotask = globals && globals.queueMicrotask;\n  if (typeof globalQueueMicrotask === 'function') {\n    return globalQueueMicrotask;\n  }\n\n  const resolvedPromise = promiseResolvedWith(undefined);\n  return (fn: () => void) => PerformPromiseThen(resolvedPromise, fn);\n})();\n\nexport function reflectCall<T, A extends any[], R>(F: (this: T, ...fnArgs: A) => R, V: T, args: A): R {\n  if (typeof F !== 'function') {\n    throw new TypeError('Argument is not a function');\n  }\n  return Function.prototype.apply.call(F, V, args);\n}\n\nexport function promiseCall<T, A extends any[], R>(F: (this: T, ...fnArgs: A) => R | PromiseLike<R>,\n                                                   V: T,\n                                                   args: A): Promise<R> {\n  assert(typeof F === 'function');\n  assert(V !== undefined);\n  assert(Array.isArray(args));\n  try {\n    return promiseResolvedWith(reflectCall(F, V, args));\n  } catch (value) {\n    return promiseRejectedWith(value);\n  }\n}\n","import assert from '../stub/assert';\n\n// Original from Chromium\n// https://chromium.googlesource.com/chromium/src/+/0aee4434a4dba42a42abaea9bfbc0cd196a63bc1/third_party/blink/renderer/core/streams/SimpleQueue.js\n\nconst QUEUE_MAX_ARRAY_SIZE = 16384;\n\ninterface Node<T> {\n  _elements: T[];\n  _next: Node<T> | undefined;\n}\n\n/**\n * Simple queue structure.\n *\n * Avoids scalability issues with using a packed array directly by using\n * multiple arrays in a linked list and keeping the array size bounded.\n */\nexport class SimpleQueue<T> {\n  private _front: Node<T>;\n  private _back: Node<T>;\n  private _cursor = 0;\n  private _size = 0;\n\n  constructor() {\n    // _front and _back are always defined.\n    this._front = {\n      _elements: [],\n      _next: undefined\n    };\n    this._back = this._front;\n    // The cursor is used to avoid calling Array.shift().\n    // It contains the index of the front element of the array inside the\n    // front-most node. It is always in the range [0, QUEUE_MAX_ARRAY_SIZE).\n    this._cursor = 0;\n    // When there is only one node, size === elements.length - cursor.\n    this._size = 0;\n  }\n\n  get length(): number {\n    return this._size;\n  }\n\n  // For exception safety, this method is structured in order:\n  // 1. Read state\n  // 2. Calculate required state mutations\n  // 3. Perform state mutations\n  push(element: T): void {\n    const oldBack = this._back;\n    let newBack = oldBack;\n    assert(oldBack._next === undefined);\n    if (oldBack._elements.length === QUEUE_MAX_ARRAY_SIZE - 1) {\n      newBack = {\n        _elements: [],\n        _next: undefined\n      };\n    }\n\n    // push() is the mutation most likely to throw an exception, so it\n    // goes first.\n    oldBack._elements.push(element);\n    if (newBack !== oldBack) {\n      this._back = newBack;\n      oldBack._next = newBack;\n    }\n    ++this._size;\n  }\n\n  // Like push(), shift() follows the read -> calculate -> mutate pattern for\n  // exception safety.\n  shift(): T {\n    assert(this._size > 0); // must not be called on an empty queue\n\n    const oldFront = this._front;\n    let newFront = oldFront;\n    const oldCursor = this._cursor;\n    let newCursor = oldCursor + 1;\n\n    const elements = oldFront._elements;\n    const element = elements[oldCursor];\n\n    if (newCursor === QUEUE_MAX_ARRAY_SIZE) {\n      assert(elements.length === QUEUE_MAX_ARRAY_SIZE);\n      assert(oldFront._next !== undefined);\n      newFront = oldFront._next!;\n      newCursor = 0;\n    }\n\n    // No mutations before this point.\n    --this._size;\n    this._cursor = newCursor;\n    if (oldFront !== newFront) {\n      this._front = newFront;\n    }\n\n    // Permit shifted element to be garbage collected.\n    elements[oldCursor] = undefined!;\n\n    return element;\n  }\n\n  // The tricky thing about forEach() is that it can be called\n  // re-entrantly. The queue may be mutated inside the callback. It is easy to\n  // see that push() within the callback has no negative effects since the end\n  // of the queue is checked for on every iteration. If shift() is called\n  // repeatedly within the callback then the next iteration may return an\n  // element that has been removed. In this case the callback will be called\n  // with undefined values until we either \"catch up\" with elements that still\n  // exist or reach the back of the queue.\n  forEach(callback: (element: T) => void): void {\n    let i = this._cursor;\n    let node = this._front;\n    let elements = node._elements;\n    while (i !== elements.length || node._next !== undefined) {\n      if (i === elements.length) {\n        assert(node._next !== undefined);\n        assert(i === QUEUE_MAX_ARRAY_SIZE);\n        node = node._next!;\n        elements = node._elements;\n        i = 0;\n        if (elements.length === 0) {\n          break;\n        }\n      }\n      callback(elements[i]);\n      ++i;\n    }\n  }\n\n  // Return the element that would be returned if shift() was called now,\n  // without modifying the queue.\n  peek(): T {\n    assert(this._size > 0); // must not be called on an empty queue\n\n    const front = this._front;\n    const cursor = this._cursor;\n    return front._elements[cursor];\n  }\n}\n","import assert from '../../stub/assert';\nimport { ReadableStream, ReadableStreamCancel, ReadableStreamReader } from '../readable-stream';\nimport { newPromise, setPromiseIsHandledToTrue } from '../helpers/webidl';\n\nexport function ReadableStreamReaderGenericInitialize<R>(reader: ReadableStreamReader<R>, stream: ReadableStream<R>) {\n  reader._ownerReadableStream = stream;\n  stream._reader = reader;\n\n  if (stream._state === 'readable') {\n    defaultReaderClosedPromiseInitialize(reader);\n  } else if (stream._state === 'closed') {\n    defaultReaderClosedPromiseInitializeAsResolved(reader);\n  } else {\n    assert(stream._state === 'errored');\n\n    defaultReaderClosedPromiseInitializeAsRejected(reader, stream._storedError);\n  }\n}\n\n// A client of ReadableStreamDefaultReader and ReadableStreamBYOBReader may use these functions directly to bypass state\n// check.\n\nexport function ReadableStreamReaderGenericCancel(reader: ReadableStreamReader<any>, reason: any): Promise<undefined> {\n  const stream = reader._ownerReadableStream;\n  assert(stream !== undefined);\n  return ReadableStreamCancel(stream, reason);\n}\n\nexport function ReadableStreamReaderGenericRelease(reader: ReadableStreamReader<any>) {\n  assert(reader._ownerReadableStream !== undefined);\n  assert(reader._ownerReadableStream._reader === reader);\n\n  if (reader._ownerReadableStream._state === 'readable') {\n    defaultReaderClosedPromiseReject(\n      reader,\n      new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));\n  } else {\n    defaultReaderClosedPromiseResetToRejected(\n      reader,\n      new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));\n  }\n\n  reader._ownerReadableStream._reader = undefined;\n  reader._ownerReadableStream = undefined!;\n}\n\n// Helper functions for the readers.\n\nexport function readerLockException(name: string): TypeError {\n  return new TypeError('Cannot ' + name + ' a stream using a released reader');\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nexport function defaultReaderClosedPromiseInitialize(reader: ReadableStreamReader<any>) {\n  reader._closedPromise = newPromise((resolve, reject) => {\n    reader._closedPromise_resolve = resolve;\n    reader._closedPromise_reject = reject;\n  });\n}\n\nexport function defaultReaderClosedPromiseInitializeAsRejected(reader: ReadableStreamReader<any>, reason: any) {\n  defaultReaderClosedPromiseInitialize(reader);\n  defaultReaderClosedPromiseReject(reader, reason);\n}\n\nexport function defaultReaderClosedPromiseInitializeAsResolved(reader: ReadableStreamReader<any>) {\n  defaultReaderClosedPromiseInitialize(reader);\n  defaultReaderClosedPromiseResolve(reader);\n}\n\nexport function defaultReaderClosedPromiseReject(reader: ReadableStreamReader<any>, reason: any) {\n  if (reader._closedPromise_reject === undefined) {\n    return;\n  }\n\n  setPromiseIsHandledToTrue(reader._closedPromise);\n  reader._closedPromise_reject(reason);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n\nexport function defaultReaderClosedPromiseResetToRejected(reader: ReadableStreamReader<any>, reason: any) {\n  assert(reader._closedPromise_resolve === undefined);\n  assert(reader._closedPromise_reject === undefined);\n\n  defaultReaderClosedPromiseInitializeAsRejected(reader, reason);\n}\n\nexport function defaultReaderClosedPromiseResolve(reader: ReadableStreamReader<any>) {\n  if (reader._closedPromise_resolve === undefined) {\n    return;\n  }\n\n  reader._closedPromise_resolve(undefined);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n","export const AbortSteps = Symbol('[[AbortSteps]]');\nexport const ErrorSteps = Symbol('[[ErrorSteps]]');\nexport const CancelSteps = Symbol('[[CancelSteps]]');\nexport const PullSteps = Symbol('[[PullSteps]]');\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite#Polyfill\nconst NumberIsFinite: typeof Number.isFinite = Number.isFinite || function (x) {\n  return typeof x === 'number' && isFinite(x);\n};\n\nexport default NumberIsFinite;\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc#Polyfill\nconst MathTrunc: typeof Math.trunc = Math.trunc || function (v) {\n  return v < 0 ? Math.ceil(v) : Math.floor(v);\n};\n\nexport default MathTrunc;\n","import NumberIsFinite from '../../stub/number-isfinite';\nimport MathTrunc from '../../stub/math-trunc';\n\n// https://heycam.github.io/webidl/#idl-dictionaries\nexport function isDictionary(x: any): x is object | null {\n  return typeof x === 'object' || typeof x === 'function';\n}\n\nexport function assertDictionary(obj: unknown,\n                                 context: string): asserts obj is object | null | undefined {\n  if (obj !== undefined && !isDictionary(obj)) {\n    throw new TypeError(`${context} is not an object.`);\n  }\n}\n\nexport type AnyFunction = (...args: any[]) => any;\n\n// https://heycam.github.io/webidl/#idl-callback-functions\nexport function assertFunction(x: unknown, context: string): asserts x is AnyFunction {\n  if (typeof x !== 'function') {\n    throw new TypeError(`${context} is not a function.`);\n  }\n}\n\n// https://heycam.github.io/webidl/#idl-object\nexport function isObject(x: any): x is object {\n  return (typeof x === 'object' && x !== null) || typeof x === 'function';\n}\n\nexport function assertObject(x: unknown,\n                             context: string): asserts x is object {\n  if (!isObject(x)) {\n    throw new TypeError(`${context} is not an object.`);\n  }\n}\n\nexport function assertRequiredArgument<T extends any>(x: T | undefined,\n                                                      position: number,\n                                                      context: string): asserts x is T {\n  if (x === undefined) {\n    throw new TypeError(`Parameter ${position} is required in '${context}'.`);\n  }\n}\n\nexport function assertRequiredField<T extends any>(x: T | undefined,\n                                                   field: string,\n                                                   context: string): asserts x is T {\n  if (x === undefined) {\n    throw new TypeError(`${field} is required in '${context}'.`);\n  }\n}\n\n// https://heycam.github.io/webidl/#idl-unrestricted-double\nexport function convertUnrestrictedDouble(value: unknown): number {\n  return Number(value);\n}\n\nfunction censorNegativeZero(x: number): number {\n  return x === 0 ? 0 : x;\n}\n\nfunction integerPart(x: number): number {\n  return censorNegativeZero(MathTrunc(x));\n}\n\n// https://heycam.github.io/webidl/#idl-unsigned-long-long\nexport function convertUnsignedLongLongWithEnforceRange(value: unknown, context: string): number {\n  const lowerBound = 0;\n  const upperBound = Number.MAX_SAFE_INTEGER;\n\n  let x = Number(value);\n  x = censorNegativeZero(x);\n\n  if (!NumberIsFinite(x)) {\n    throw new TypeError(`${context} is not a finite number`);\n  }\n\n  x = integerPart(x);\n\n  if (x < lowerBound || x > upperBound) {\n    throw new TypeError(`${context} is outside the accepted range of ${lowerBound} to ${upperBound}, inclusive`);\n  }\n\n  if (!NumberIsFinite(x) || x === 0) {\n    return 0;\n  }\n\n  // TODO Use BigInt if supported?\n  // let xBigInt = BigInt(integerPart(x));\n  // xBigInt = BigInt.asUintN(64, xBigInt);\n  // return Number(xBigInt);\n\n  return x;\n}\n","import { IsReadableStream, ReadableStream } from '../readable-stream';\n\nexport function assertReadableStream(x: unknown, context: string): asserts x is ReadableStream {\n  if (!IsReadableStream(x)) {\n    throw new TypeError(`${context} is not a ReadableStream.`);\n  }\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericInitialize,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport { IsReadableStreamLocked, ReadableStream } from '../readable-stream';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { PullSteps } from '../abstract-ops/internal-methods';\nimport { newPromise, promiseRejectedWith } from '../helpers/webidl';\nimport { assertRequiredArgument } from '../validators/basic';\nimport { assertReadableStream } from '../validators/readable-stream';\n\n/**\n * A result returned by {@link ReadableStreamDefaultReader.read}.\n *\n * @public\n */\nexport type ReadableStreamDefaultReadResult<T> = {\n  done: false;\n  value: T;\n} | {\n  done: true;\n  value?: undefined;\n}\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamDefaultReader<R>(stream: ReadableStream): ReadableStreamDefaultReader<R> {\n  return new ReadableStreamDefaultReader(stream);\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamAddReadRequest<R>(stream: ReadableStream<R>,\n                                                readRequest: ReadRequest<R>): void {\n  assert(IsReadableStreamDefaultReader(stream._reader));\n  assert(stream._state === 'readable');\n\n  (stream._reader! as ReadableStreamDefaultReader<R>)._readRequests.push(readRequest);\n}\n\nexport function ReadableStreamFulfillReadRequest<R>(stream: ReadableStream<R>, chunk: R | undefined, done: boolean) {\n  const reader = stream._reader as ReadableStreamDefaultReader<R>;\n\n  assert(reader._readRequests.length > 0);\n\n  const readRequest = reader._readRequests.shift()!;\n  if (done) {\n    readRequest._closeSteps();\n  } else {\n    readRequest._chunkSteps(chunk!);\n  }\n}\n\nexport function ReadableStreamGetNumReadRequests<R>(stream: ReadableStream<R>): number {\n  return (stream._reader as ReadableStreamDefaultReader<R>)._readRequests.length;\n}\n\nexport function ReadableStreamHasDefaultReader(stream: ReadableStream): boolean {\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return false;\n  }\n\n  if (!IsReadableStreamDefaultReader(reader)) {\n    return false;\n  }\n\n  return true;\n}\n\n// Readers\n\nexport interface ReadRequest<R> {\n  _chunkSteps(chunk: R): void;\n\n  _closeSteps(): void;\n\n  _errorSteps(e: any): void;\n}\n\n/**\n * A default reader vended by a {@link ReadableStream}.\n *\n * @public\n */\nexport class ReadableStreamDefaultReader<R = any> {\n  /** @internal */\n  _ownerReadableStream!: ReadableStream<R>;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readRequests: SimpleQueue<ReadRequest<R>>;\n\n  constructor(stream: ReadableStream<R>) {\n    assertRequiredArgument(stream, 1, 'ReadableStreamDefaultReader');\n    assertReadableStream(stream, 'First parameter');\n\n    if (IsReadableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n    }\n\n    ReadableStreamReaderGenericInitialize(this, stream);\n\n    this._readRequests = new SimpleQueue();\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed,\n   * or rejected if the stream ever errors or the reader's lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('cancel'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('cancel'));\n    }\n\n    return ReadableStreamReaderGenericCancel(this, reason);\n  }\n\n  /**\n   * Returns a promise that allows access to the next chunk from the stream's internal queue, if available.\n   *\n   * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.\n   */\n  read(): Promise<ReadableStreamDefaultReadResult<R>> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('read'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('read from'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamDefaultReadResult<R>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamDefaultReadResult<R>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),\n      _closeSteps: () => resolvePromise({ value: undefined, done: true }),\n      _errorSteps: e => rejectPromise(e)\n    };\n    ReadableStreamDefaultReaderRead(this, readRequest);\n    return promise;\n  }\n\n  /**\n   * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.\n   * If the associated stream is errored when the lock is released, the reader will appear errored in the same way\n   * from now on; otherwise, the reader will appear closed.\n   *\n   * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by\n   * the reader's {@link ReadableStreamDefaultReader.read | read()} method has not yet been settled. Attempting to\n   * do so will throw a `TypeError` and leave the reader locked to the stream.\n   */\n  releaseLock(): void {\n    if (!IsReadableStreamDefaultReader(this)) {\n      throw defaultReaderBrandCheckException('releaseLock');\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return;\n    }\n\n    if (this._readRequests.length > 0) {\n      throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n    }\n\n    ReadableStreamReaderGenericRelease(this);\n  }\n}\n\nObject.defineProperties(ReadableStreamDefaultReader.prototype, {\n  cancel: { enumerable: true },\n  read: { enumerable: true },\n  releaseLock: { enumerable: true },\n  closed: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamDefaultReader.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamDefaultReader',\n    configurable: true\n  });\n}\n\n// Abstract operations for the readers.\n\nexport function IsReadableStreamDefaultReader<R = any>(x: any): x is ReadableStreamDefaultReader<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readRequests')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamDefaultReader;\n}\n\nexport function ReadableStreamDefaultReaderRead<R>(reader: ReadableStreamDefaultReader<R>,\n                                                   readRequest: ReadRequest<R>): void {\n  const stream = reader._ownerReadableStream;\n\n  assert(stream !== undefined);\n\n  stream._disturbed = true;\n\n  if (stream._state === 'closed') {\n    readRequest._closeSteps();\n  } else if (stream._state === 'errored') {\n    readRequest._errorSteps(stream._storedError);\n  } else {\n    assert(stream._state === 'readable');\n    stream._readableStreamController[PullSteps](readRequest as ReadRequest<any>);\n  }\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nfunction defaultReaderBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamDefaultReader.prototype.${name} can only be used on a ReadableStreamDefaultReader`);\n}\n","/// <reference lib=\"es2018.asynciterable\" />\n\n/* eslint-disable @typescript-eslint/no-empty-function */\nexport const AsyncIteratorPrototype: AsyncIterable<any> | undefined =\n  Object.getPrototypeOf(Object.getPrototypeOf(async function* (): AsyncIterableIterator<any> {}).prototype);\n","/// <reference lib=\"es2018.asynciterable\" />\n\nimport { ReadableStream } from '../readable-stream';\nimport {\n  AcquireReadableStreamDefaultReader,\n  ReadableStreamDefaultReader,\n  ReadableStreamDefaultReaderRead,\n  ReadableStreamDefaultReadResult,\n  ReadRequest\n} from './default-reader';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport assert from '../../stub/assert';\nimport { AsyncIteratorPrototype } from '@@target/stub/async-iterator-prototype';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport {\n  newPromise,\n  promiseRejectedWith,\n  promiseResolvedWith,\n  queueMicrotask,\n  transformPromiseWith\n} from '../helpers/webidl';\n\n/**\n * An async iterator returned by {@link ReadableStream.values}.\n *\n * @public\n */\nexport interface ReadableStreamAsyncIterator<R> extends AsyncIterator<R> {\n  next(): Promise<IteratorResult<R, undefined>>;\n\n  return(value?: any): Promise<IteratorResult<any>>;\n}\n\nexport class ReadableStreamAsyncIteratorImpl<R> {\n  private readonly _reader: ReadableStreamDefaultReader<R>;\n  private readonly _preventCancel: boolean;\n  private _ongoingPromise: Promise<ReadableStreamDefaultReadResult<R>> | undefined = undefined;\n  private _isFinished = false;\n\n  constructor(reader: ReadableStreamDefaultReader<R>, preventCancel: boolean) {\n    this._reader = reader;\n    this._preventCancel = preventCancel;\n  }\n\n  next(): Promise<ReadableStreamDefaultReadResult<R>> {\n    const nextSteps = () => this._nextSteps();\n    this._ongoingPromise = this._ongoingPromise ?\n      transformPromiseWith(this._ongoingPromise, nextSteps, nextSteps) :\n      nextSteps();\n    return this._ongoingPromise;\n  }\n\n  return(value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    const returnSteps = () => this._returnSteps(value);\n    return this._ongoingPromise ?\n      transformPromiseWith(this._ongoingPromise, returnSteps, returnSteps) :\n      returnSteps();\n  }\n\n  private _nextSteps(): Promise<ReadableStreamDefaultReadResult<R>> {\n    if (this._isFinished) {\n      return Promise.resolve({ value: undefined, done: true });\n    }\n\n    const reader = this._reader;\n    if (reader._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('iterate'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamDefaultReadResult<R>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamDefaultReadResult<R>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => {\n        this._ongoingPromise = undefined;\n        // This needs to be delayed by one microtask, otherwise we stop pulling too early which breaks a test.\n        // FIXME Is this a bug in the specification, or in the test?\n        queueMicrotask(() => resolvePromise({ value: chunk, done: false }));\n      },\n      _closeSteps: () => {\n        this._ongoingPromise = undefined;\n        this._isFinished = true;\n        ReadableStreamReaderGenericRelease(reader);\n        resolvePromise({ value: undefined, done: true });\n      },\n      _errorSteps: reason => {\n        this._ongoingPromise = undefined;\n        this._isFinished = true;\n        ReadableStreamReaderGenericRelease(reader);\n        rejectPromise(reason);\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n    return promise;\n  }\n\n  private _returnSteps(value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (this._isFinished) {\n      return Promise.resolve({ value, done: true });\n    }\n    this._isFinished = true;\n\n    const reader = this._reader;\n    if (reader._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('finish iterating'));\n    }\n\n    assert(reader._readRequests.length === 0);\n\n    if (!this._preventCancel) {\n      const result = ReadableStreamReaderGenericCancel(reader, value);\n      ReadableStreamReaderGenericRelease(reader);\n      return transformPromiseWith(result, () => ({ value, done: true }));\n    }\n\n    ReadableStreamReaderGenericRelease(reader);\n    return promiseResolvedWith({ value, done: true });\n  }\n}\n\ndeclare class ReadableStreamAsyncIteratorInstance<R> implements ReadableStreamAsyncIterator<R> {\n  /** @interal */\n  _asyncIteratorImpl: ReadableStreamAsyncIteratorImpl<R>;\n\n  next(): Promise<IteratorResult<R, undefined>>;\n\n  return(value?: any): Promise<IteratorResult<any>>;\n}\n\nconst ReadableStreamAsyncIteratorPrototype: ReadableStreamAsyncIteratorInstance<any> = {\n  next(this: ReadableStreamAsyncIteratorInstance<any>): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (!IsReadableStreamAsyncIterator(this)) {\n      return promiseRejectedWith(streamAsyncIteratorBrandCheckException('next'));\n    }\n    return this._asyncIteratorImpl.next();\n  },\n\n  return(this: ReadableStreamAsyncIteratorInstance<any>, value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (!IsReadableStreamAsyncIterator(this)) {\n      return promiseRejectedWith(streamAsyncIteratorBrandCheckException('return'));\n    }\n    return this._asyncIteratorImpl.return(value);\n  }\n} as any;\nif (AsyncIteratorPrototype !== undefined) {\n  Object.setPrototypeOf(ReadableStreamAsyncIteratorPrototype, AsyncIteratorPrototype);\n}\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamAsyncIterator<R>(stream: ReadableStream<R>,\n                                                      preventCancel: boolean): ReadableStreamAsyncIterator<R> {\n  const reader = AcquireReadableStreamDefaultReader<R>(stream);\n  const impl = new ReadableStreamAsyncIteratorImpl(reader, preventCancel);\n  const iterator: ReadableStreamAsyncIteratorInstance<R> = Object.create(ReadableStreamAsyncIteratorPrototype);\n  iterator._asyncIteratorImpl = impl;\n  return iterator;\n}\n\nfunction IsReadableStreamAsyncIterator<R = any>(x: any): x is ReadableStreamAsyncIterator<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_asyncIteratorImpl')) {\n    return false;\n  }\n\n  try {\n    // noinspection SuspiciousTypeOfGuard\n    return (x as ReadableStreamAsyncIteratorInstance<any>)._asyncIteratorImpl instanceof\n      ReadableStreamAsyncIteratorImpl;\n  } catch {\n    return false;\n  }\n}\n\n// Helper functions for the ReadableStream.\n\nfunction streamAsyncIteratorBrandCheckException(name: string): TypeError {\n  return new TypeError(`ReadableStreamAsyncIterator.${name} can only be used on a ReadableSteamAsyncIterator`);\n}\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Polyfill\nconst NumberIsNaN: typeof Number.isNaN = Number.isNaN || function (x) {\n  // eslint-disable-next-line no-self-compare\n  return x !== x;\n};\n\nexport default NumberIsNaN;\n","export function CreateArrayFromList<T extends any[]>(elements: T): T {\n  // We use arrays to represent lists, so this is basically a no-op.\n  // Do a slice though just in case we happen to depend on the unique-ness.\n  return elements.slice() as T;\n}\n\nexport function CopyDataBlockBytes(dest: ArrayBuffer,\n                                   destOffset: number,\n                                   src: ArrayBuffer,\n                                   srcOffset: number,\n                                   n: number) {\n  new Uint8Array(dest).set(new Uint8Array(src, srcOffset, n), destOffset);\n}\n\n// Not implemented correctly\nexport function TransferArrayBuffer<T extends ArrayBufferLike>(O: T): T {\n  return O;\n}\n\n// Not implemented correctly\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nexport function CanTransferArrayBuffer(O: ArrayBufferLike): boolean {\n  return true;\n}\n\n// Not implemented correctly\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nexport function IsDetachedBuffer(O: ArrayBufferLike): boolean {\n  return false;\n}\n\nexport function ArrayBufferSlice(buffer: ArrayBufferLike, begin: number, end: number): ArrayBufferLike {\n  // ArrayBuffer.prototype.slice is not available on IE10\n  // https://www.caniuse.com/mdn-javascript_builtins_arraybuffer_slice\n  if (buffer.slice) {\n    return buffer.slice(begin, end);\n  }\n  const length = end - begin;\n  const slice = new ArrayBuffer(length);\n  CopyDataBlockBytes(slice, 0, buffer, begin, length);\n  return slice;\n}\n","import NumberIsNaN from '../../stub/number-isnan';\nimport { ArrayBufferSlice } from './ecmascript';\n\nexport function IsNonNegativeNumber(v: number): boolean {\n  if (typeof v !== 'number') {\n    return false;\n  }\n\n  if (NumberIsNaN(v)) {\n    return false;\n  }\n\n  if (v < 0) {\n    return false;\n  }\n\n  return true;\n}\n\nexport function CloneAsUint8Array(O: ArrayBufferView): Uint8Array {\n  const buffer = ArrayBufferSlice(O.buffer, O.byteOffset, O.byteOffset + O.byteLength);\n  return new Uint8Array(buffer);\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport { IsNonNegativeNumber } from './miscellaneous';\n\nexport interface QueueContainer<T> {\n  _queue: SimpleQueue<T>;\n  _queueTotalSize: number;\n}\n\nexport interface QueuePair<T> {\n  value: T;\n  size: number;\n}\n\nexport function DequeueValue<T>(container: QueueContainer<QueuePair<T>>): T {\n  assert('_queue' in container && '_queueTotalSize' in container);\n  assert(container._queue.length > 0);\n\n  const pair = container._queue.shift()!;\n  container._queueTotalSize -= pair.size;\n  if (container._queueTotalSize < 0) {\n    container._queueTotalSize = 0;\n  }\n\n  return pair.value;\n}\n\nexport function EnqueueValueWithSize<T>(container: QueueContainer<QueuePair<T>>, value: T, size: number) {\n  assert('_queue' in container && '_queueTotalSize' in container);\n\n  if (!IsNonNegativeNumber(size) || size === Infinity) {\n    throw new RangeError('Size must be a finite, non-NaN, non-negative number.');\n  }\n\n  container._queue.push({ value, size });\n  container._queueTotalSize += size;\n}\n\nexport function PeekQueueValue<T>(container: QueueContainer<QueuePair<T>>): T {\n  assert('_queue' in container && '_queueTotalSize' in container);\n  assert(container._queue.length > 0);\n\n  const pair = container._queue.peek();\n  return pair.value;\n}\n\nexport function ResetQueue<T>(container: QueueContainer<T>) {\n  assert('_queue' in container && '_queueTotalSize' in container);\n\n  container._queue = new SimpleQueue<T>();\n  container._queueTotalSize = 0;\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport { ResetQueue } from '../abstract-ops/queue-with-sizes';\nimport {\n  ReadableStreamAddReadRequest,\n  ReadableStreamFulfillReadRequest,\n  ReadableStreamGetNumReadRequests,\n  ReadableStreamHasDefaultReader,\n  ReadRequest\n} from './default-reader';\nimport {\n  ReadableStreamAddReadIntoRequest,\n  ReadableStreamFulfillReadIntoRequest,\n  ReadableStreamGetNumReadIntoRequests,\n  ReadableStreamHasBYOBReader,\n  ReadIntoRequest\n} from './byob-reader';\nimport NumberIsInteger from '../../stub/number-isinteger';\nimport {\n  IsReadableStreamLocked,\n  ReadableByteStream,\n  ReadableStreamClose,\n  ReadableStreamError\n} from '../readable-stream';\nimport { ValidatedUnderlyingByteSource } from './underlying-source';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport {\n  ArrayBufferSlice,\n  CanTransferArrayBuffer,\n  CopyDataBlockBytes,\n  IsDetachedBuffer,\n  TransferArrayBuffer\n} from '../abstract-ops/ecmascript';\nimport { CancelSteps, PullSteps } from '../abstract-ops/internal-methods';\nimport { promiseResolvedWith, uponPromise } from '../helpers/webidl';\nimport { assertRequiredArgument, convertUnsignedLongLongWithEnforceRange } from '../validators/basic';\n\n/**\n * A pull-into request in a {@link ReadableByteStreamController}.\n *\n * @public\n */\nexport class ReadableStreamBYOBRequest {\n  /** @internal */\n  _associatedReadableByteStreamController!: ReadableByteStreamController;\n  /** @internal */\n  _view!: ArrayBufferView | null;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the view for writing in to, or `null` if the BYOB request has already been responded to.\n   */\n  get view(): ArrayBufferView | null {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('view');\n    }\n\n    return this._view;\n  }\n\n  /**\n   * Indicates to the associated readable byte stream that `bytesWritten` bytes were written into\n   * {@link ReadableStreamBYOBRequest.view | view}, causing the result be surfaced to the consumer.\n   *\n   * After this method is called, {@link ReadableStreamBYOBRequest.view | view} will be transferred and no longer\n   * modifiable.\n   */\n  respond(bytesWritten: number): void;\n  respond(bytesWritten: number | undefined): void {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('respond');\n    }\n    assertRequiredArgument(bytesWritten, 1, 'respond');\n    bytesWritten = convertUnsignedLongLongWithEnforceRange(bytesWritten, 'First parameter');\n\n    if (this._associatedReadableByteStreamController === undefined) {\n      throw new TypeError('This BYOB request has been invalidated');\n    }\n\n    if (IsDetachedBuffer(this._view!.buffer)) {\n      throw new TypeError(`The BYOB request's buffer has been detached and so cannot be used as a response`);\n    }\n\n    assert(this._view!.byteLength > 0);\n    assert(this._view!.buffer.byteLength > 0);\n\n    ReadableByteStreamControllerRespond(this._associatedReadableByteStreamController, bytesWritten);\n  }\n\n  /**\n   * Indicates to the associated readable byte stream that instead of writing into\n   * {@link ReadableStreamBYOBRequest.view | view}, the underlying byte source is providing a new `ArrayBufferView`,\n   * which will be given to the consumer of the readable byte stream.\n   *\n   * After this method is called, `view` will be transferred and no longer modifiable.\n   */\n  respondWithNewView(view: ArrayBufferView): void;\n  respondWithNewView(view: ArrayBufferView | undefined): void {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('respondWithNewView');\n    }\n    assertRequiredArgument(view, 1, 'respondWithNewView');\n\n    if (!ArrayBuffer.isView(view)) {\n      throw new TypeError('You can only respond with array buffer views');\n    }\n\n    if (this._associatedReadableByteStreamController === undefined) {\n      throw new TypeError('This BYOB request has been invalidated');\n    }\n\n    if (IsDetachedBuffer(view.buffer)) {\n      throw new TypeError('The given view\\'s buffer has been detached and so cannot be used as a response');\n    }\n\n    ReadableByteStreamControllerRespondWithNewView(this._associatedReadableByteStreamController, view);\n  }\n}\n\nObject.defineProperties(ReadableStreamBYOBRequest.prototype, {\n  respond: { enumerable: true },\n  respondWithNewView: { enumerable: true },\n  view: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamBYOBRequest.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamBYOBRequest',\n    configurable: true\n  });\n}\n\ninterface ArrayBufferViewConstructor<T extends ArrayBufferView = ArrayBufferView> {\n  new(buffer: ArrayBufferLike, byteOffset: number, length?: number): T;\n\n  readonly prototype: T;\n  readonly BYTES_PER_ELEMENT: number;\n}\n\ninterface ByteQueueElement {\n  buffer: ArrayBufferLike;\n  byteOffset: number;\n  byteLength: number;\n}\n\ntype PullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> =\n  DefaultPullIntoDescriptor\n  | BYOBPullIntoDescriptor<T>;\n\ninterface DefaultPullIntoDescriptor {\n  buffer: ArrayBufferLike;\n  bufferByteLength: number;\n  byteOffset: number;\n  byteLength: number;\n  bytesFilled: number;\n  elementSize: number;\n  viewConstructor: ArrayBufferViewConstructor<Uint8Array>;\n  readerType: 'default';\n}\n\ninterface BYOBPullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> {\n  buffer: ArrayBufferLike;\n  bufferByteLength: number;\n  byteOffset: number;\n  byteLength: number;\n  bytesFilled: number;\n  elementSize: number;\n  viewConstructor: ArrayBufferViewConstructor<T>;\n  readerType: 'byob';\n}\n\n/**\n * Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue.\n *\n * @public\n */\nexport class ReadableByteStreamController {\n  /** @internal */\n  _controlledReadableByteStream!: ReadableByteStream;\n  /** @internal */\n  _queue!: SimpleQueue<ByteQueueElement>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _closeRequested!: boolean;\n  /** @internal */\n  _pullAgain!: boolean;\n  /** @internal */\n  _pulling !: boolean;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _pullAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _cancelAlgorithm!: (reason: any) => Promise<void>;\n  /** @internal */\n  _autoAllocateChunkSize: number | undefined;\n  /** @internal */\n  _byobRequest: ReadableStreamBYOBRequest | null;\n  /** @internal */\n  _pendingPullIntos!: SimpleQueue<PullIntoDescriptor>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the current BYOB pull request, or `null` if there isn't one.\n   */\n  get byobRequest(): ReadableStreamBYOBRequest | null {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('byobRequest');\n    }\n\n    return ReadableByteStreamControllerGetBYOBRequest(this);\n  }\n\n  /**\n   * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is\n   * over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure.\n   */\n  get desiredSize(): number | null {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('desiredSize');\n    }\n\n    return ReadableByteStreamControllerGetDesiredSize(this);\n  }\n\n  /**\n   * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from\n   * the stream, but once those are read, the stream will become closed.\n   */\n  close(): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('close');\n    }\n\n    if (this._closeRequested) {\n      throw new TypeError('The stream has already been closed; do not close it again!');\n    }\n\n    const state = this._controlledReadableByteStream._state;\n    if (state !== 'readable') {\n      throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be closed`);\n    }\n\n    ReadableByteStreamControllerClose(this);\n  }\n\n  /**\n   * Enqueues the given chunk chunk in the controlled readable stream.\n   * The chunk has to be an `ArrayBufferView` instance, or else a `TypeError` will be thrown.\n   */\n  enqueue(chunk: ArrayBufferView): void;\n  enqueue(chunk: ArrayBufferView | undefined): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('enqueue');\n    }\n\n    assertRequiredArgument(chunk, 1, 'enqueue');\n    if (!ArrayBuffer.isView(chunk)) {\n      throw new TypeError('chunk must be an array buffer view');\n    }\n    if (chunk.byteLength === 0) {\n      throw new TypeError('chunk must have non-zero byteLength');\n    }\n    if (chunk.buffer.byteLength === 0) {\n      throw new TypeError(`chunk's buffer must have non-zero byteLength`);\n    }\n\n    if (this._closeRequested) {\n      throw new TypeError('stream is closed or draining');\n    }\n\n    const state = this._controlledReadableByteStream._state;\n    if (state !== 'readable') {\n      throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be enqueued to`);\n    }\n\n    ReadableByteStreamControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.\n   */\n  error(e: any = undefined): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('error');\n    }\n\n    ReadableByteStreamControllerError(this, e);\n  }\n\n  /** @internal */\n  [CancelSteps](reason: any): Promise<void> {\n    ReadableByteStreamControllerClearPendingPullIntos(this);\n\n    ResetQueue(this);\n\n    const result = this._cancelAlgorithm(reason);\n    ReadableByteStreamControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [PullSteps](readRequest: ReadRequest<Uint8Array>): void {\n    const stream = this._controlledReadableByteStream;\n    assert(ReadableStreamHasDefaultReader(stream));\n\n    if (this._queueTotalSize > 0) {\n      assert(ReadableStreamGetNumReadRequests(stream) === 0);\n\n      const entry = this._queue.shift()!;\n      this._queueTotalSize -= entry.byteLength;\n\n      ReadableByteStreamControllerHandleQueueDrain(this);\n\n      const view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);\n\n      readRequest._chunkSteps(view);\n      return;\n    }\n\n    const autoAllocateChunkSize = this._autoAllocateChunkSize;\n    if (autoAllocateChunkSize !== undefined) {\n      let buffer: ArrayBuffer;\n      try {\n        buffer = new ArrayBuffer(autoAllocateChunkSize);\n      } catch (bufferE) {\n        readRequest._errorSteps(bufferE);\n        return;\n      }\n\n      const pullIntoDescriptor: DefaultPullIntoDescriptor = {\n        buffer,\n        bufferByteLength: autoAllocateChunkSize,\n        byteOffset: 0,\n        byteLength: autoAllocateChunkSize,\n        bytesFilled: 0,\n        elementSize: 1,\n        viewConstructor: Uint8Array,\n        readerType: 'default'\n      };\n\n      this._pendingPullIntos.push(pullIntoDescriptor);\n    }\n\n    ReadableStreamAddReadRequest(stream, readRequest);\n    ReadableByteStreamControllerCallPullIfNeeded(this);\n  }\n}\n\nObject.defineProperties(ReadableByteStreamController.prototype, {\n  close: { enumerable: true },\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  byobRequest: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableByteStreamController.prototype, Symbol.toStringTag, {\n    value: 'ReadableByteStreamController',\n    configurable: true\n  });\n}\n\n// Abstract operations for the ReadableByteStreamController.\n\nexport function IsReadableByteStreamController(x: any): x is ReadableByteStreamController {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableByteStream')) {\n    return false;\n  }\n\n  return x instanceof ReadableByteStreamController;\n}\n\nfunction IsReadableStreamBYOBRequest(x: any): x is ReadableStreamBYOBRequest {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_associatedReadableByteStreamController')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamBYOBRequest;\n}\n\nfunction ReadableByteStreamControllerCallPullIfNeeded(controller: ReadableByteStreamController): void {\n  const shouldPull = ReadableByteStreamControllerShouldCallPull(controller);\n  if (!shouldPull) {\n    return;\n  }\n\n  if (controller._pulling) {\n    controller._pullAgain = true;\n    return;\n  }\n\n  assert(!controller._pullAgain);\n\n  controller._pulling = true;\n\n  // TODO: Test controller argument\n  const pullPromise = controller._pullAlgorithm();\n  uponPromise(\n    pullPromise,\n    () => {\n      controller._pulling = false;\n\n      if (controller._pullAgain) {\n        controller._pullAgain = false;\n        ReadableByteStreamControllerCallPullIfNeeded(controller);\n      }\n    },\n    e => {\n      ReadableByteStreamControllerError(controller, e);\n    }\n  );\n}\n\nfunction ReadableByteStreamControllerClearPendingPullIntos(controller: ReadableByteStreamController) {\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n  controller._pendingPullIntos = new SimpleQueue();\n}\n\nfunction ReadableByteStreamControllerCommitPullIntoDescriptor<T extends ArrayBufferView>(\n  stream: ReadableByteStream,\n  pullIntoDescriptor: PullIntoDescriptor<T>\n) {\n  assert(stream._state !== 'errored');\n\n  let done = false;\n  if (stream._state === 'closed') {\n    assert(pullIntoDescriptor.bytesFilled === 0);\n    done = true;\n  }\n\n  const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);\n  if (pullIntoDescriptor.readerType === 'default') {\n    ReadableStreamFulfillReadRequest(stream, filledView as unknown as Uint8Array, done);\n  } else {\n    assert(pullIntoDescriptor.readerType === 'byob');\n    ReadableStreamFulfillReadIntoRequest(stream, filledView, done);\n  }\n}\n\nfunction ReadableByteStreamControllerConvertPullIntoDescriptor<T extends ArrayBufferView>(\n  pullIntoDescriptor: PullIntoDescriptor<T>\n): T {\n  const bytesFilled = pullIntoDescriptor.bytesFilled;\n  const elementSize = pullIntoDescriptor.elementSize;\n\n  assert(bytesFilled <= pullIntoDescriptor.byteLength);\n  assert(bytesFilled % elementSize === 0);\n\n  return new pullIntoDescriptor.viewConstructor(\n    pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize) as T;\n}\n\nfunction ReadableByteStreamControllerEnqueueChunkToQueue(controller: ReadableByteStreamController,\n                                                         buffer: ArrayBufferLike,\n                                                         byteOffset: number,\n                                                         byteLength: number) {\n  controller._queue.push({ buffer, byteOffset, byteLength });\n  controller._queueTotalSize += byteLength;\n}\n\nfunction ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller: ReadableByteStreamController,\n                                                                     pullIntoDescriptor: PullIntoDescriptor) {\n  const elementSize = pullIntoDescriptor.elementSize;\n\n  const currentAlignedBytes = pullIntoDescriptor.bytesFilled - pullIntoDescriptor.bytesFilled % elementSize;\n\n  const maxBytesToCopy = Math.min(controller._queueTotalSize,\n                                  pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled);\n  const maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;\n  const maxAlignedBytes = maxBytesFilled - maxBytesFilled % elementSize;\n\n  let totalBytesToCopyRemaining = maxBytesToCopy;\n  let ready = false;\n  if (maxAlignedBytes > currentAlignedBytes) {\n    totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled;\n    ready = true;\n  }\n\n  const queue = controller._queue;\n\n  while (totalBytesToCopyRemaining > 0) {\n    const headOfQueue = queue.peek();\n\n    const bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength);\n\n    const destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n    CopyDataBlockBytes(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy);\n\n    if (headOfQueue.byteLength === bytesToCopy) {\n      queue.shift();\n    } else {\n      headOfQueue.byteOffset += bytesToCopy;\n      headOfQueue.byteLength -= bytesToCopy;\n    }\n    controller._queueTotalSize -= bytesToCopy;\n\n    ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor);\n\n    totalBytesToCopyRemaining -= bytesToCopy;\n  }\n\n  if (!ready) {\n    assert(controller._queueTotalSize === 0);\n    assert(pullIntoDescriptor.bytesFilled > 0);\n    assert(pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize);\n  }\n\n  return ready;\n}\n\nfunction ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller: ReadableByteStreamController,\n                                                                size: number,\n                                                                pullIntoDescriptor: PullIntoDescriptor) {\n  assert(controller._pendingPullIntos.length === 0 || controller._pendingPullIntos.peek() === pullIntoDescriptor);\n  assert(controller._byobRequest === null);\n  pullIntoDescriptor.bytesFilled += size;\n}\n\nfunction ReadableByteStreamControllerHandleQueueDrain(controller: ReadableByteStreamController) {\n  assert(controller._controlledReadableByteStream._state === 'readable');\n\n  if (controller._queueTotalSize === 0 && controller._closeRequested) {\n    ReadableByteStreamControllerClearAlgorithms(controller);\n    ReadableStreamClose(controller._controlledReadableByteStream);\n  } else {\n    ReadableByteStreamControllerCallPullIfNeeded(controller);\n  }\n}\n\nfunction ReadableByteStreamControllerInvalidateBYOBRequest(controller: ReadableByteStreamController) {\n  if (controller._byobRequest === null) {\n    return;\n  }\n\n  controller._byobRequest._associatedReadableByteStreamController = undefined!;\n  controller._byobRequest._view = null!;\n  controller._byobRequest = null;\n}\n\nfunction ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller: ReadableByteStreamController) {\n  assert(!controller._closeRequested);\n\n  while (controller._pendingPullIntos.length > 0) {\n    if (controller._queueTotalSize === 0) {\n      return;\n    }\n\n    const pullIntoDescriptor = controller._pendingPullIntos.peek();\n\n    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {\n      ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n      ReadableByteStreamControllerCommitPullIntoDescriptor(\n        controller._controlledReadableByteStream,\n        pullIntoDescriptor\n      );\n    }\n  }\n}\n\nexport function ReadableByteStreamControllerPullInto<T extends ArrayBufferView>(\n  controller: ReadableByteStreamController,\n  view: T,\n  readIntoRequest: ReadIntoRequest<T>\n): void {\n  const stream = controller._controlledReadableByteStream;\n\n  let elementSize = 1;\n  if (view.constructor !== DataView) {\n    elementSize = (view.constructor as ArrayBufferViewConstructor<T>).BYTES_PER_ELEMENT;\n  }\n\n  const ctor = view.constructor as ArrayBufferViewConstructor<T>;\n\n  // try {\n  const buffer = TransferArrayBuffer(view.buffer);\n  // } catch (e) {\n  //   readIntoRequest._errorSteps(e);\n  //   return;\n  // }\n\n  const pullIntoDescriptor: BYOBPullIntoDescriptor<T> = {\n    buffer,\n    bufferByteLength: buffer.byteLength,\n    byteOffset: view.byteOffset,\n    byteLength: view.byteLength,\n    bytesFilled: 0,\n    elementSize,\n    viewConstructor: ctor,\n    readerType: 'byob'\n  };\n\n  if (controller._pendingPullIntos.length > 0) {\n    controller._pendingPullIntos.push(pullIntoDescriptor);\n\n    // No ReadableByteStreamControllerCallPullIfNeeded() call since:\n    // - No change happens on desiredSize\n    // - The source has already been notified of that there's at least 1 pending read(view)\n\n    ReadableStreamAddReadIntoRequest(stream, readIntoRequest);\n    return;\n  }\n\n  if (stream._state === 'closed') {\n    const emptyView = new ctor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0);\n    readIntoRequest._closeSteps(emptyView);\n    return;\n  }\n\n  if (controller._queueTotalSize > 0) {\n    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {\n      const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);\n\n      ReadableByteStreamControllerHandleQueueDrain(controller);\n\n      readIntoRequest._chunkSteps(filledView);\n      return;\n    }\n\n    if (controller._closeRequested) {\n      const e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n      ReadableByteStreamControllerError(controller, e);\n\n      readIntoRequest._errorSteps(e);\n      return;\n    }\n  }\n\n  controller._pendingPullIntos.push(pullIntoDescriptor);\n\n  ReadableStreamAddReadIntoRequest<T>(stream, readIntoRequest);\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nfunction ReadableByteStreamControllerRespondInClosedState(controller: ReadableByteStreamController,\n                                                          firstDescriptor: PullIntoDescriptor) {\n  assert(firstDescriptor.bytesFilled === 0);\n\n  const stream = controller._controlledReadableByteStream;\n  if (ReadableStreamHasBYOBReader(stream)) {\n    while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n      const pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);\n      ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);\n    }\n  }\n}\n\nfunction ReadableByteStreamControllerRespondInReadableState(controller: ReadableByteStreamController,\n                                                            bytesWritten: number,\n                                                            pullIntoDescriptor: PullIntoDescriptor) {\n  assert(pullIntoDescriptor.bytesFilled + bytesWritten <= pullIntoDescriptor.byteLength);\n\n  ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor);\n\n  if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {\n    return;\n  }\n\n  ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n  const remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize;\n  if (remainderSize > 0) {\n    const end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n    const remainder = ArrayBufferSlice(pullIntoDescriptor.buffer, end - remainderSize, end);\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength);\n  }\n\n  pullIntoDescriptor.bytesFilled -= remainderSize;\n  ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);\n\n  ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n}\n\nfunction ReadableByteStreamControllerRespondInternal(controller: ReadableByteStreamController, bytesWritten: number) {\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  assert(CanTransferArrayBuffer(firstDescriptor.buffer));\n\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n\n  const state = controller._controlledReadableByteStream._state;\n  if (state === 'closed') {\n    assert(bytesWritten === 0);\n    ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor);\n  } else {\n    assert(state === 'readable');\n    assert(bytesWritten > 0);\n    ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);\n  }\n\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nfunction ReadableByteStreamControllerShiftPendingPullInto(\n  controller: ReadableByteStreamController\n): PullIntoDescriptor {\n  assert(controller._byobRequest === null);\n  const descriptor = controller._pendingPullIntos.shift()!;\n  return descriptor;\n}\n\nfunction ReadableByteStreamControllerShouldCallPull(controller: ReadableByteStreamController): boolean {\n  const stream = controller._controlledReadableByteStream;\n\n  if (stream._state !== 'readable') {\n    return false;\n  }\n\n  if (controller._closeRequested) {\n    return false;\n  }\n\n  if (!controller._started) {\n    return false;\n  }\n\n  if (ReadableStreamHasDefaultReader(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    return true;\n  }\n\n  if (ReadableStreamHasBYOBReader(stream) && ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n    return true;\n  }\n\n  const desiredSize = ReadableByteStreamControllerGetDesiredSize(controller);\n  assert(desiredSize !== null);\n  if (desiredSize! > 0) {\n    return true;\n  }\n\n  return false;\n}\n\nfunction ReadableByteStreamControllerClearAlgorithms(controller: ReadableByteStreamController) {\n  controller._pullAlgorithm = undefined!;\n  controller._cancelAlgorithm = undefined!;\n}\n\n// A client of ReadableByteStreamController may use these functions directly to bypass state check.\n\nexport function ReadableByteStreamControllerClose(controller: ReadableByteStreamController) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (controller._closeRequested || stream._state !== 'readable') {\n    return;\n  }\n\n  if (controller._queueTotalSize > 0) {\n    controller._closeRequested = true;\n\n    return;\n  }\n\n  if (controller._pendingPullIntos.length > 0) {\n    const firstPendingPullInto = controller._pendingPullIntos.peek();\n    if (firstPendingPullInto.bytesFilled > 0) {\n      const e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n      ReadableByteStreamControllerError(controller, e);\n\n      throw e;\n    }\n  }\n\n  ReadableByteStreamControllerClearAlgorithms(controller);\n  ReadableStreamClose(stream);\n}\n\nexport function ReadableByteStreamControllerEnqueue(controller: ReadableByteStreamController, chunk: ArrayBufferView) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (controller._closeRequested || stream._state !== 'readable') {\n    return;\n  }\n\n  const buffer = chunk.buffer;\n  const byteOffset = chunk.byteOffset;\n  const byteLength = chunk.byteLength;\n  if (IsDetachedBuffer(buffer)) {\n    throw new TypeError('chunk\\'s buffer is detached and so cannot be enqueued');\n  }\n  const transferredBuffer = TransferArrayBuffer(buffer);\n\n  if (controller._pendingPullIntos.length > 0) {\n    const firstPendingPullInto = controller._pendingPullIntos.peek();\n    if (IsDetachedBuffer(firstPendingPullInto.buffer)) {\n      throw new TypeError(\n        'The BYOB request\\'s buffer has been detached and so cannot be filled with an enqueued chunk'\n      );\n    }\n    firstPendingPullInto.buffer = TransferArrayBuffer(firstPendingPullInto.buffer);\n  }\n\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n\n  if (ReadableStreamHasDefaultReader(stream)) {\n    if (ReadableStreamGetNumReadRequests(stream) === 0) {\n      assert(controller._pendingPullIntos.length === 0);\n      ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n    } else {\n      assert(controller._queue.length === 0);\n      if (controller._pendingPullIntos.length > 0) {\n        assert(controller._pendingPullIntos.peek().readerType === 'default');\n        ReadableByteStreamControllerShiftPendingPullInto(controller);\n      }\n      const transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength);\n      ReadableStreamFulfillReadRequest(stream, transferredView, false);\n    }\n  } else if (ReadableStreamHasBYOBReader(stream)) {\n    // TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully.\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n    ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n  } else {\n    assert(!IsReadableStreamLocked(stream));\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n  }\n\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nexport function ReadableByteStreamControllerError(controller: ReadableByteStreamController, e: any) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (stream._state !== 'readable') {\n    return;\n  }\n\n  ReadableByteStreamControllerClearPendingPullIntos(controller);\n\n  ResetQueue(controller);\n  ReadableByteStreamControllerClearAlgorithms(controller);\n  ReadableStreamError(stream, e);\n}\n\nexport function ReadableByteStreamControllerGetBYOBRequest(\n  controller: ReadableByteStreamController\n): ReadableStreamBYOBRequest | null {\n  if (controller._byobRequest === null && controller._pendingPullIntos.length > 0) {\n    const firstDescriptor = controller._pendingPullIntos.peek();\n    const view = new Uint8Array(firstDescriptor.buffer,\n                                firstDescriptor.byteOffset + firstDescriptor.bytesFilled,\n                                firstDescriptor.byteLength - firstDescriptor.bytesFilled);\n\n    const byobRequest: ReadableStreamBYOBRequest = Object.create(ReadableStreamBYOBRequest.prototype);\n    SetUpReadableStreamBYOBRequest(byobRequest, controller, view);\n    controller._byobRequest = byobRequest;\n  }\n  return controller._byobRequest;\n}\n\nfunction ReadableByteStreamControllerGetDesiredSize(controller: ReadableByteStreamController): number | null {\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'errored') {\n    return null;\n  }\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\nexport function ReadableByteStreamControllerRespond(controller: ReadableByteStreamController, bytesWritten: number) {\n  assert(controller._pendingPullIntos.length > 0);\n\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'closed') {\n    if (bytesWritten !== 0) {\n      throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream');\n    }\n  } else {\n    assert(state === 'readable');\n    if (bytesWritten === 0) {\n      throw new TypeError('bytesWritten must be greater than 0 when calling respond() on a readable stream');\n    }\n    if (firstDescriptor.bytesFilled + bytesWritten > firstDescriptor.byteLength) {\n      throw new RangeError('bytesWritten out of range');\n    }\n  }\n\n  firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer);\n\n  ReadableByteStreamControllerRespondInternal(controller, bytesWritten);\n}\n\nexport function ReadableByteStreamControllerRespondWithNewView(controller: ReadableByteStreamController,\n                                                               view: ArrayBufferView) {\n  assert(controller._pendingPullIntos.length > 0);\n  assert(!IsDetachedBuffer(view.buffer));\n\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'closed') {\n    if (view.byteLength !== 0) {\n      throw new TypeError('The view\\'s length must be 0 when calling respondWithNewView() on a closed stream');\n    }\n  } else {\n    assert(state === 'readable');\n    if (view.byteLength === 0) {\n      throw new TypeError(\n        'The view\\'s length must be greater than 0 when calling respondWithNewView() on a readable stream'\n      );\n    }\n  }\n\n  if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) {\n    throw new RangeError('The region specified by view does not match byobRequest');\n  }\n  if (firstDescriptor.bufferByteLength !== view.buffer.byteLength) {\n    throw new RangeError('The buffer of view has different capacity than byobRequest');\n  }\n  if (firstDescriptor.bytesFilled + view.byteLength > firstDescriptor.byteLength) {\n    throw new RangeError('The region specified by view is larger than byobRequest');\n  }\n\n  const viewByteLength = view.byteLength;\n  firstDescriptor.buffer = TransferArrayBuffer(view.buffer);\n  ReadableByteStreamControllerRespondInternal(controller, viewByteLength);\n}\n\nexport function SetUpReadableByteStreamController(stream: ReadableByteStream,\n                                                  controller: ReadableByteStreamController,\n                                                  startAlgorithm: () => void | PromiseLike<void>,\n                                                  pullAlgorithm: () => Promise<void>,\n                                                  cancelAlgorithm: (reason: any) => Promise<void>,\n                                                  highWaterMark: number,\n                                                  autoAllocateChunkSize: number | undefined) {\n  assert(stream._readableStreamController === undefined);\n  if (autoAllocateChunkSize !== undefined) {\n    assert(NumberIsInteger(autoAllocateChunkSize));\n    assert(autoAllocateChunkSize > 0);\n  }\n\n  controller._controlledReadableByteStream = stream;\n\n  controller._pullAgain = false;\n  controller._pulling = false;\n\n  controller._byobRequest = null;\n\n  // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n  controller._queue = controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._closeRequested = false;\n  controller._started = false;\n\n  controller._strategyHWM = highWaterMark;\n\n  controller._pullAlgorithm = pullAlgorithm;\n  controller._cancelAlgorithm = cancelAlgorithm;\n\n  controller._autoAllocateChunkSize = autoAllocateChunkSize;\n\n  controller._pendingPullIntos = new SimpleQueue();\n\n  stream._readableStreamController = controller;\n\n  const startResult = startAlgorithm();\n  uponPromise(\n    promiseResolvedWith(startResult),\n    () => {\n      controller._started = true;\n\n      assert(!controller._pulling);\n      assert(!controller._pullAgain);\n\n      ReadableByteStreamControllerCallPullIfNeeded(controller);\n    },\n    r => {\n      ReadableByteStreamControllerError(controller, r);\n    }\n  );\n}\n\nexport function SetUpReadableByteStreamControllerFromUnderlyingSource(\n  stream: ReadableByteStream,\n  underlyingByteSource: ValidatedUnderlyingByteSource,\n  highWaterMark: number\n) {\n  const controller: ReadableByteStreamController = Object.create(ReadableByteStreamController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let pullAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let cancelAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingByteSource.start !== undefined) {\n    startAlgorithm = () => underlyingByteSource.start!(controller);\n  }\n  if (underlyingByteSource.pull !== undefined) {\n    pullAlgorithm = () => underlyingByteSource.pull!(controller);\n  }\n  if (underlyingByteSource.cancel !== undefined) {\n    cancelAlgorithm = reason => underlyingByteSource.cancel!(reason);\n  }\n\n  const autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;\n  if (autoAllocateChunkSize === 0) {\n    throw new TypeError('autoAllocateChunkSize must be greater than 0');\n  }\n\n  SetUpReadableByteStreamController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize\n  );\n}\n\nfunction SetUpReadableStreamBYOBRequest(request: ReadableStreamBYOBRequest,\n                                        controller: ReadableByteStreamController,\n                                        view: ArrayBufferView) {\n  assert(IsReadableByteStreamController(controller));\n  assert(typeof view === 'object');\n  assert(ArrayBuffer.isView(view));\n  assert(!IsDetachedBuffer(view.buffer));\n  request._associatedReadableByteStreamController = controller;\n  request._view = view;\n}\n\n// Helper functions for the ReadableStreamBYOBRequest.\n\nfunction byobRequestBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamBYOBRequest.prototype.${name} can only be used on a ReadableStreamBYOBRequest`);\n}\n\n// Helper functions for the ReadableByteStreamController.\n\nfunction byteStreamControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableByteStreamController.prototype.${name} can only be used on a ReadableByteStreamController`);\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericInitialize,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport { IsReadableStreamLocked, ReadableByteStream, ReadableStream } from '../readable-stream';\nimport {\n  IsReadableByteStreamController,\n  ReadableByteStreamController,\n  ReadableByteStreamControllerPullInto\n} from './byte-stream-controller';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { newPromise, promiseRejectedWith } from '../helpers/webidl';\nimport { assertRequiredArgument } from '../validators/basic';\nimport { assertReadableStream } from '../validators/readable-stream';\nimport { IsDetachedBuffer } from '../abstract-ops/ecmascript';\n\n/**\n * A result returned by {@link ReadableStreamBYOBReader.read}.\n *\n * @public\n */\nexport type ReadableStreamBYOBReadResult<T extends ArrayBufferView> = {\n  done: false;\n  value: T;\n} | {\n  done: true;\n  value: T | undefined;\n};\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamBYOBReader(stream: ReadableByteStream): ReadableStreamBYOBReader {\n  return new ReadableStreamBYOBReader(stream);\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamAddReadIntoRequest<T extends ArrayBufferView>(stream: ReadableByteStream,\n                                                                            readIntoRequest: ReadIntoRequest<T>): void {\n  assert(IsReadableStreamBYOBReader(stream._reader));\n  assert(stream._state === 'readable' || stream._state === 'closed');\n\n  (stream._reader! as ReadableStreamBYOBReader)._readIntoRequests.push(readIntoRequest);\n}\n\nexport function ReadableStreamFulfillReadIntoRequest(stream: ReadableByteStream,\n                                                     chunk: ArrayBufferView,\n                                                     done: boolean) {\n  const reader = stream._reader as ReadableStreamBYOBReader;\n\n  assert(reader._readIntoRequests.length > 0);\n\n  const readIntoRequest = reader._readIntoRequests.shift()!;\n  if (done) {\n    readIntoRequest._closeSteps(chunk);\n  } else {\n    readIntoRequest._chunkSteps(chunk);\n  }\n}\n\nexport function ReadableStreamGetNumReadIntoRequests(stream: ReadableByteStream): number {\n  return (stream._reader as ReadableStreamBYOBReader)._readIntoRequests.length;\n}\n\nexport function ReadableStreamHasBYOBReader(stream: ReadableByteStream): boolean {\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return false;\n  }\n\n  if (!IsReadableStreamBYOBReader(reader)) {\n    return false;\n  }\n\n  return true;\n}\n\n// Readers\n\nexport interface ReadIntoRequest<T extends ArrayBufferView> {\n  _chunkSteps(chunk: T): void;\n\n  _closeSteps(chunk: T | undefined): void;\n\n  _errorSteps(e: any): void;\n}\n\n/**\n * A BYOB reader vended by a {@link ReadableStream}.\n *\n * @public\n */\nexport class ReadableStreamBYOBReader {\n  /** @internal */\n  _ownerReadableStream!: ReadableByteStream;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readIntoRequests: SimpleQueue<ReadIntoRequest<any>>;\n\n  constructor(stream: ReadableByteStream) {\n    assertRequiredArgument(stream, 1, 'ReadableStreamBYOBReader');\n    assertReadableStream(stream, 'First parameter');\n\n    if (IsReadableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n    }\n\n    if (!IsReadableByteStreamController(stream._readableStreamController)) {\n      throw new TypeError('Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte ' +\n        'source');\n    }\n\n    ReadableStreamReaderGenericInitialize(this, stream);\n\n    this._readIntoRequests = new SimpleQueue();\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or\n   * the reader's lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('cancel'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('cancel'));\n    }\n\n    return ReadableStreamReaderGenericCancel(this, reason);\n  }\n\n  /**\n   * Attempts to reads bytes into view, and returns a promise resolved with the result.\n   *\n   * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.\n   */\n  read<T extends ArrayBufferView>(view: T): Promise<ReadableStreamBYOBReadResult<T>> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('read'));\n    }\n\n    if (!ArrayBuffer.isView(view)) {\n      return promiseRejectedWith(new TypeError('view must be an array buffer view'));\n    }\n    if (view.byteLength === 0) {\n      return promiseRejectedWith(new TypeError('view must have non-zero byteLength'));\n    }\n    if (view.buffer.byteLength === 0) {\n      return promiseRejectedWith(new TypeError(`view's buffer must have non-zero byteLength`));\n    }\n    if (IsDetachedBuffer(view.buffer)) {\n      return promiseRejectedWith(new TypeError('view\\'s buffer has been detached'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('read from'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamBYOBReadResult<T>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamBYOBReadResult<T>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readIntoRequest: ReadIntoRequest<T> = {\n      _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),\n      _closeSteps: chunk => resolvePromise({ value: chunk, done: true }),\n      _errorSteps: e => rejectPromise(e)\n    };\n    ReadableStreamBYOBReaderRead(this, view, readIntoRequest);\n    return promise;\n  }\n\n  /**\n   * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.\n   * If the associated stream is errored when the lock is released, the reader will appear errored in the same way\n   * from now on; otherwise, the reader will appear closed.\n   *\n   * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by\n   * the reader's {@link ReadableStreamBYOBReader.read | read()} method has not yet been settled. Attempting to\n   * do so will throw a `TypeError` and leave the reader locked to the stream.\n   */\n  releaseLock(): void {\n    if (!IsReadableStreamBYOBReader(this)) {\n      throw byobReaderBrandCheckException('releaseLock');\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return;\n    }\n\n    if (this._readIntoRequests.length > 0) {\n      throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n    }\n\n    ReadableStreamReaderGenericRelease(this);\n  }\n}\n\nObject.defineProperties(ReadableStreamBYOBReader.prototype, {\n  cancel: { enumerable: true },\n  read: { enumerable: true },\n  releaseLock: { enumerable: true },\n  closed: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamBYOBReader.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamBYOBReader',\n    configurable: true\n  });\n}\n\n// Abstract operations for the readers.\n\nexport function IsReadableStreamBYOBReader(x: any): x is ReadableStreamBYOBReader {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readIntoRequests')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamBYOBReader;\n}\n\nexport function ReadableStreamBYOBReaderRead<T extends ArrayBufferView>(\n  reader: ReadableStreamBYOBReader,\n  view: T,\n  readIntoRequest: ReadIntoRequest<T>\n): void {\n  const stream = reader._ownerReadableStream;\n\n  assert(stream !== undefined);\n\n  stream._disturbed = true;\n\n  if (stream._state === 'errored') {\n    readIntoRequest._errorSteps(stream._storedError);\n  } else {\n    ReadableByteStreamControllerPullInto(\n      stream._readableStreamController as ReadableByteStreamController,\n      view,\n      readIntoRequest\n    );\n  }\n}\n\n// Helper functions for the ReadableStreamBYOBReader.\n\nfunction byobReaderBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamBYOBReader.prototype.${name} can only be used on a ReadableStreamBYOBReader`);\n}\n","import { QueuingStrategy, QueuingStrategySizeCallback } from '../queuing-strategy';\nimport NumberIsNaN from '../../stub/number-isnan';\n\nexport function ExtractHighWaterMark(strategy: QueuingStrategy, defaultHWM: number): number {\n  const { highWaterMark } = strategy;\n\n  if (highWaterMark === undefined) {\n    return defaultHWM;\n  }\n\n  if (NumberIsNaN(highWaterMark) || highWaterMark < 0) {\n    throw new RangeError('Invalid highWaterMark');\n  }\n\n  return highWaterMark;\n}\n\nexport function ExtractSizeAlgorithm<T>(strategy: QueuingStrategy<T>): QueuingStrategySizeCallback<T> {\n  const { size } = strategy;\n\n  if (!size) {\n    return () => 1;\n  }\n\n  return size;\n}\n","import { QueuingStrategy, QueuingStrategySizeCallback } from '../queuing-strategy';\nimport { assertDictionary, assertFunction, convertUnrestrictedDouble } from './basic';\n\nexport function convertQueuingStrategy<T>(init: QueuingStrategy<T> | null | undefined,\n                                          context: string): QueuingStrategy<T> {\n  assertDictionary(init, context);\n  const highWaterMark = init?.highWaterMark;\n  const size = init?.size;\n  return {\n    highWaterMark: highWaterMark === undefined ? undefined : convertUnrestrictedDouble(highWaterMark),\n    size: size === undefined ? undefined : convertQueuingStrategySize(size, `${context} has member 'size' that`)\n  };\n}\n\nfunction convertQueuingStrategySize<T>(fn: QueuingStrategySizeCallback<T>,\n                                       context: string): QueuingStrategySizeCallback<T> {\n  assertFunction(fn, context);\n  return chunk => convertUnrestrictedDouble(fn(chunk));\n}\n","import { assertDictionary, assertFunction } from './basic';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\nimport {\n  UnderlyingSink,\n  UnderlyingSinkAbortCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  ValidatedUnderlyingSink\n} from '../writable-stream/underlying-sink';\nimport { WritableStreamDefaultController } from '../writable-stream';\n\nexport function convertUnderlyingSink<W>(original: UnderlyingSink<W> | null,\n                                         context: string): ValidatedUnderlyingSink<W> {\n  assertDictionary(original, context);\n  const abort = original?.abort;\n  const close = original?.close;\n  const start = original?.start;\n  const type = original?.type;\n  const write = original?.write;\n  return {\n    abort: abort === undefined ?\n      undefined :\n      convertUnderlyingSinkAbortCallback(abort, original!, `${context} has member 'abort' that`),\n    close: close === undefined ?\n      undefined :\n      convertUnderlyingSinkCloseCallback(close, original!, `${context} has member 'close' that`),\n    start: start === undefined ?\n      undefined :\n      convertUnderlyingSinkStartCallback(start, original!, `${context} has member 'start' that`),\n    write: write === undefined ?\n      undefined :\n      convertUnderlyingSinkWriteCallback(write, original!, `${context} has member 'write' that`),\n    type\n  };\n}\n\nfunction convertUnderlyingSinkAbortCallback(\n  fn: UnderlyingSinkAbortCallback,\n  original: UnderlyingSink,\n  context: string\n): (reason: any) => Promise<void> {\n  assertFunction(fn, context);\n  return (reason: any) => promiseCall(fn, original, [reason]);\n}\n\nfunction convertUnderlyingSinkCloseCallback(\n  fn: UnderlyingSinkCloseCallback,\n  original: UnderlyingSink,\n  context: string\n): () => Promise<void> {\n  assertFunction(fn, context);\n  return () => promiseCall(fn, original, []);\n}\n\nfunction convertUnderlyingSinkStartCallback(\n  fn: UnderlyingSinkStartCallback,\n  original: UnderlyingSink,\n  context: string\n): UnderlyingSinkStartCallback {\n  assertFunction(fn, context);\n  return (controller: WritableStreamDefaultController) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertUnderlyingSinkWriteCallback<W>(\n  fn: UnderlyingSinkWriteCallback<W>,\n  original: UnderlyingSink<W>,\n  context: string\n): (chunk: W, controller: WritableStreamDefaultController) => Promise<void> {\n  assertFunction(fn, context);\n  return (chunk: W, controller: WritableStreamDefaultController) => promiseCall(fn, original, [chunk, controller]);\n}\n","import { IsWritableStream, WritableStream } from '../writable-stream';\n\nexport function assertWritableStream(x: unknown, context: string): asserts x is WritableStream {\n  if (!IsWritableStream(x)) {\n    throw new TypeError(`${context} is not a WritableStream.`);\n  }\n}\n","/**\n * A signal object that allows you to communicate with a request and abort it if required\n * via its associated `AbortController` object.\n *\n * @remarks\n *   This interface is compatible with the `AbortSignal` interface defined in TypeScript's DOM types.\n *   It is redefined here, so it can be polyfilled without a DOM, for example with\n *   {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.\n *\n * @public\n */\nexport interface AbortSignal {\n  /**\n   * Whether the request is aborted.\n   */\n  readonly aborted: boolean;\n\n  /**\n   * Add an event listener to be triggered when this signal becomes aborted.\n   */\n  addEventListener(type: 'abort', listener: () => void): void;\n\n  /**\n   * Remove an event listener that was previously added with {@link AbortSignal.addEventListener}.\n   */\n  removeEventListener(type: 'abort', listener: () => void): void;\n}\n\nexport function isAbortSignal(value: unknown): value is AbortSignal {\n  if (typeof value !== 'object' || value === null) {\n    return false;\n  }\n  try {\n    return typeof (value as AbortSignal).aborted === 'boolean';\n  } catch {\n    // AbortSignal.prototype.aborted throws if its brand check fails\n    return false;\n  }\n}\n\n/**\n * A controller object that allows you to abort an `AbortSignal` when desired.\n *\n * @remarks\n *   This interface is compatible with the `AbortController` interface defined in TypeScript's DOM types.\n *   It is redefined here, so it can be polyfilled without a DOM, for example with\n *   {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.\n *\n * @internal\n */\nexport interface AbortController {\n  readonly signal: AbortSignal;\n\n  abort(): void;\n}\n\ninterface AbortControllerConstructor {\n  new(): AbortController;\n}\n\nconst supportsAbortController = typeof (AbortController as any) === 'function';\n\n/**\n * Construct a new AbortController, if supported by the platform.\n *\n * @internal\n */\nexport function createAbortController(): AbortController | undefined {\n  if (supportsAbortController) {\n    return new (AbortController as AbortControllerConstructor)();\n  }\n  return undefined;\n}\n","import assert from '../stub/assert';\nimport {\n  newPromise,\n  promiseRejectedWith,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  uponPromise\n} from './helpers/webidl';\nimport {\n  DequeueValue,\n  EnqueueValueWithSize,\n  PeekQueueValue,\n  QueuePair,\n  ResetQueue\n} from './abstract-ops/queue-with-sizes';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { SimpleQueue } from './simple-queue';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { AbortSteps, ErrorSteps } from './abstract-ops/internal-methods';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport {\n  UnderlyingSink,\n  UnderlyingSinkAbortCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  ValidatedUnderlyingSink\n} from './writable-stream/underlying-sink';\nimport { assertObject, assertRequiredArgument } from './validators/basic';\nimport { convertUnderlyingSink } from './validators/underlying-sink';\nimport { assertWritableStream } from './validators/writable-stream';\nimport { AbortController, AbortSignal, createAbortController } from './abort-signal';\n\ntype WritableStreamState = 'writable' | 'closed' | 'erroring' | 'errored';\n\ninterface WriteOrCloseRequest {\n  _resolve: (value?: undefined) => void;\n  _reject: (reason: any) => void;\n}\n\ntype WriteRequest = WriteOrCloseRequest;\ntype CloseRequest = WriteOrCloseRequest;\n\ninterface PendingAbortRequest {\n  _promise: Promise<undefined>;\n  _resolve: (value?: undefined) => void;\n  _reject: (reason: any) => void;\n  _reason: any;\n  _wasAlreadyErroring: boolean;\n}\n\n/**\n * A writable stream represents a destination for data, into which you can write.\n *\n * @public\n */\nclass WritableStream<W = any> {\n  /** @internal */\n  _state!: WritableStreamState;\n  /** @internal */\n  _storedError: any;\n  /** @internal */\n  _writer: WritableStreamDefaultWriter<W> | undefined;\n  /** @internal */\n  _writableStreamController!: WritableStreamDefaultController<W>;\n  /** @internal */\n  _writeRequests!: SimpleQueue<WriteRequest>;\n  /** @internal */\n  _inFlightWriteRequest: WriteRequest | undefined;\n  /** @internal */\n  _closeRequest: CloseRequest | undefined;\n  /** @internal */\n  _inFlightCloseRequest: CloseRequest | undefined;\n  /** @internal */\n  _pendingAbortRequest: PendingAbortRequest | undefined;\n  /** @internal */\n  _backpressure!: boolean;\n\n  constructor(underlyingSink?: UnderlyingSink<W>, strategy?: QueuingStrategy<W>);\n  constructor(rawUnderlyingSink: UnderlyingSink<W> | null | undefined = {},\n              rawStrategy: QueuingStrategy<W> | null | undefined = {}) {\n    if (rawUnderlyingSink === undefined) {\n      rawUnderlyingSink = null;\n    } else {\n      assertObject(rawUnderlyingSink, 'First parameter');\n    }\n\n    const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');\n    const underlyingSink = convertUnderlyingSink(rawUnderlyingSink, 'First parameter');\n\n    InitializeWritableStream(this);\n\n    const type = underlyingSink.type;\n    if (type !== undefined) {\n      throw new RangeError('Invalid type is specified');\n    }\n\n    const sizeAlgorithm = ExtractSizeAlgorithm(strategy);\n    const highWaterMark = ExtractHighWaterMark(strategy, 1);\n\n    SetUpWritableStreamDefaultControllerFromUnderlyingSink(this, underlyingSink, highWaterMark, sizeAlgorithm);\n  }\n\n  /**\n   * Returns whether or not the writable stream is locked to a writer.\n   */\n  get locked(): boolean {\n    if (!IsWritableStream(this)) {\n      throw streamBrandCheckException('locked');\n    }\n\n    return IsWritableStreamLocked(this);\n  }\n\n  /**\n   * Aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be\n   * immediately moved to an errored state, with any queued-up writes discarded. This will also execute any abort\n   * mechanism of the underlying sink.\n   *\n   * The returned promise will fulfill if the stream shuts down successfully, or reject if the underlying sink signaled\n   * that there was an error doing so. Additionally, it will reject with a `TypeError` (without attempting to cancel\n   * the stream) if the stream is currently locked.\n   */\n  abort(reason: any = undefined): Promise<void> {\n    if (!IsWritableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('abort'));\n    }\n\n    if (IsWritableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot abort a stream that already has a writer'));\n    }\n\n    return WritableStreamAbort(this, reason);\n  }\n\n  /**\n   * Closes the stream. The underlying sink will finish processing any previously-written chunks, before invoking its\n   * close behavior. During this time any further attempts to write will fail (without erroring the stream).\n   *\n   * The method returns a promise that will fulfill if all remaining chunks are successfully written and the stream\n   * successfully closes, or rejects if an error is encountered during this process. Additionally, it will reject with\n   * a `TypeError` (without attempting to cancel the stream) if the stream is currently locked.\n   */\n  close() {\n    if (!IsWritableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('close'));\n    }\n\n    if (IsWritableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot close a stream that already has a writer'));\n    }\n\n    if (WritableStreamCloseQueuedOrInFlight(this)) {\n      return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));\n    }\n\n    return WritableStreamClose(this);\n  }\n\n  /**\n   * Creates a {@link WritableStreamDefaultWriter | writer} and locks the stream to the new writer. While the stream\n   * is locked, no other writer can be acquired until this one is released.\n   *\n   * This functionality is especially useful for creating abstractions that desire the ability to write to a stream\n   * without interruption or interleaving. By getting a writer for the stream, you can ensure nobody else can write at\n   * the same time, which would cause the resulting written data to be unpredictable and probably useless.\n   */\n  getWriter(): WritableStreamDefaultWriter<W> {\n    if (!IsWritableStream(this)) {\n      throw streamBrandCheckException('getWriter');\n    }\n\n    return AcquireWritableStreamDefaultWriter(this);\n  }\n}\n\nObject.defineProperties(WritableStream.prototype, {\n  abort: { enumerable: true },\n  close: { enumerable: true },\n  getWriter: { enumerable: true },\n  locked: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStream.prototype, Symbol.toStringTag, {\n    value: 'WritableStream',\n    configurable: true\n  });\n}\n\nexport {\n  AcquireWritableStreamDefaultWriter,\n  CreateWritableStream,\n  IsWritableStream,\n  IsWritableStreamLocked,\n  WritableStream,\n  WritableStreamAbort,\n  WritableStreamDefaultControllerErrorIfNeeded,\n  WritableStreamDefaultWriterCloseWithErrorPropagation,\n  WritableStreamDefaultWriterRelease,\n  WritableStreamDefaultWriterWrite,\n  WritableStreamCloseQueuedOrInFlight,\n  UnderlyingSink,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkAbortCallback\n};\n\n// Abstract operations for the WritableStream.\n\nfunction AcquireWritableStreamDefaultWriter<W>(stream: WritableStream<W>): WritableStreamDefaultWriter<W> {\n  return new WritableStreamDefaultWriter(stream);\n}\n\n// Throws if and only if startAlgorithm throws.\nfunction CreateWritableStream<W>(startAlgorithm: () => void | PromiseLike<void>,\n                                 writeAlgorithm: (chunk: W) => Promise<void>,\n                                 closeAlgorithm: () => Promise<void>,\n                                 abortAlgorithm: (reason: any) => Promise<void>,\n                                 highWaterMark = 1,\n                                 sizeAlgorithm: QueuingStrategySizeCallback<W> = () => 1) {\n  assert(IsNonNegativeNumber(highWaterMark));\n\n  const stream: WritableStream<W> = Object.create(WritableStream.prototype);\n  InitializeWritableStream(stream);\n\n  const controller: WritableStreamDefaultController<W> = Object.create(WritableStreamDefaultController.prototype);\n\n  SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm,\n                                       abortAlgorithm, highWaterMark, sizeAlgorithm);\n  return stream;\n}\n\nfunction InitializeWritableStream<W>(stream: WritableStream<W>) {\n  stream._state = 'writable';\n\n  // The error that will be reported by new method calls once the state becomes errored. Only set when [[state]] is\n  // 'erroring' or 'errored'. May be set to an undefined value.\n  stream._storedError = undefined;\n\n  stream._writer = undefined;\n\n  // Initialize to undefined first because the constructor of the controller checks this\n  // variable to validate the caller.\n  stream._writableStreamController = undefined!;\n\n  // This queue is placed here instead of the writer class in order to allow for passing a writer to the next data\n  // producer without waiting for the queued writes to finish.\n  stream._writeRequests = new SimpleQueue();\n\n  // Write requests are removed from _writeRequests when write() is called on the underlying sink. This prevents\n  // them from being erroneously rejected on error. If a write() call is in-flight, the request is stored here.\n  stream._inFlightWriteRequest = undefined;\n\n  // The promise that was returned from writer.close(). Stored here because it may be fulfilled after the writer\n  // has been detached.\n  stream._closeRequest = undefined;\n\n  // Close request is removed from _closeRequest when close() is called on the underlying sink. This prevents it\n  // from being erroneously rejected on error. If a close() call is in-flight, the request is stored here.\n  stream._inFlightCloseRequest = undefined;\n\n  // The promise that was returned from writer.abort(). This may also be fulfilled after the writer has detached.\n  stream._pendingAbortRequest = undefined;\n\n  // The backpressure signal set by the controller.\n  stream._backpressure = false;\n}\n\nfunction IsWritableStream(x: unknown): x is WritableStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_writableStreamController')) {\n    return false;\n  }\n\n  return x instanceof WritableStream;\n}\n\nfunction IsWritableStreamLocked(stream: WritableStream): boolean {\n  assert(IsWritableStream(stream));\n\n  if (stream._writer === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamAbort(stream: WritableStream, reason: any): Promise<undefined> {\n  if (stream._state === 'closed' || stream._state === 'errored') {\n    return promiseResolvedWith(undefined);\n  }\n  stream._writableStreamController._abortReason = reason;\n  stream._writableStreamController._abortController?.abort();\n\n  // TypeScript narrows the type of `stream._state` down to 'writable' | 'erroring',\n  // but it doesn't know that signaling abort runs author code that might have changed the state.\n  // Widen the type again by casting to WritableStreamState.\n  const state = stream._state as WritableStreamState;\n\n  if (state === 'closed' || state === 'errored') {\n    return promiseResolvedWith(undefined);\n  }\n  if (stream._pendingAbortRequest !== undefined) {\n    return stream._pendingAbortRequest._promise;\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n\n  let wasAlreadyErroring = false;\n  if (state === 'erroring') {\n    wasAlreadyErroring = true;\n    // reason will not be used, so don't keep a reference to it.\n    reason = undefined;\n  }\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    stream._pendingAbortRequest = {\n      _promise: undefined!,\n      _resolve: resolve,\n      _reject: reject,\n      _reason: reason,\n      _wasAlreadyErroring: wasAlreadyErroring\n    };\n  });\n  stream._pendingAbortRequest!._promise = promise;\n\n  if (!wasAlreadyErroring) {\n    WritableStreamStartErroring(stream, reason);\n  }\n\n  return promise;\n}\n\nfunction WritableStreamClose(stream: WritableStream<any>): Promise<undefined> {\n  const state = stream._state;\n  if (state === 'closed' || state === 'errored') {\n    return promiseRejectedWith(new TypeError(\n      `The stream (in ${state} state) is not in the writable state and cannot be closed`));\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n  assert(!WritableStreamCloseQueuedOrInFlight(stream));\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    const closeRequest: CloseRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._closeRequest = closeRequest;\n  });\n\n  const writer = stream._writer;\n  if (writer !== undefined && stream._backpressure && state === 'writable') {\n    defaultWriterReadyPromiseResolve(writer);\n  }\n\n  WritableStreamDefaultControllerClose(stream._writableStreamController);\n\n  return promise;\n}\n\n// WritableStream API exposed for controllers.\n\nfunction WritableStreamAddWriteRequest(stream: WritableStream): Promise<undefined> {\n  assert(IsWritableStreamLocked(stream));\n  assert(stream._state === 'writable');\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    const writeRequest: WriteRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._writeRequests.push(writeRequest);\n  });\n\n  return promise;\n}\n\nfunction WritableStreamDealWithRejection(stream: WritableStream, error: any) {\n  const state = stream._state;\n\n  if (state === 'writable') {\n    WritableStreamStartErroring(stream, error);\n    return;\n  }\n\n  assert(state === 'erroring');\n  WritableStreamFinishErroring(stream);\n}\n\nfunction WritableStreamStartErroring(stream: WritableStream, reason: any) {\n  assert(stream._storedError === undefined);\n  assert(stream._state === 'writable');\n\n  const controller = stream._writableStreamController;\n  assert(controller !== undefined);\n\n  stream._state = 'erroring';\n  stream._storedError = reason;\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);\n  }\n\n  if (!WritableStreamHasOperationMarkedInFlight(stream) && controller._started) {\n    WritableStreamFinishErroring(stream);\n  }\n}\n\nfunction WritableStreamFinishErroring(stream: WritableStream) {\n  assert(stream._state === 'erroring');\n  assert(!WritableStreamHasOperationMarkedInFlight(stream));\n  stream._state = 'errored';\n  stream._writableStreamController[ErrorSteps]();\n\n  const storedError = stream._storedError;\n  stream._writeRequests.forEach(writeRequest => {\n    writeRequest._reject(storedError);\n  });\n  stream._writeRequests = new SimpleQueue();\n\n  if (stream._pendingAbortRequest === undefined) {\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    return;\n  }\n\n  const abortRequest = stream._pendingAbortRequest;\n  stream._pendingAbortRequest = undefined;\n\n  if (abortRequest._wasAlreadyErroring) {\n    abortRequest._reject(storedError);\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    return;\n  }\n\n  const promise = stream._writableStreamController[AbortSteps](abortRequest._reason);\n  uponPromise(\n    promise,\n    () => {\n      abortRequest._resolve();\n      WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    },\n    (reason: any) => {\n      abortRequest._reject(reason);\n      WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    });\n}\n\nfunction WritableStreamFinishInFlightWrite(stream: WritableStream) {\n  assert(stream._inFlightWriteRequest !== undefined);\n  stream._inFlightWriteRequest!._resolve(undefined);\n  stream._inFlightWriteRequest = undefined;\n}\n\nfunction WritableStreamFinishInFlightWriteWithError(stream: WritableStream, error: any) {\n  assert(stream._inFlightWriteRequest !== undefined);\n  stream._inFlightWriteRequest!._reject(error);\n  stream._inFlightWriteRequest = undefined;\n\n  assert(stream._state === 'writable' || stream._state === 'erroring');\n\n  WritableStreamDealWithRejection(stream, error);\n}\n\nfunction WritableStreamFinishInFlightClose(stream: WritableStream) {\n  assert(stream._inFlightCloseRequest !== undefined);\n  stream._inFlightCloseRequest!._resolve(undefined);\n  stream._inFlightCloseRequest = undefined;\n\n  const state = stream._state;\n\n  assert(state === 'writable' || state === 'erroring');\n\n  if (state === 'erroring') {\n    // The error was too late to do anything, so it is ignored.\n    stream._storedError = undefined;\n    if (stream._pendingAbortRequest !== undefined) {\n      stream._pendingAbortRequest._resolve();\n      stream._pendingAbortRequest = undefined;\n    }\n  }\n\n  stream._state = 'closed';\n\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    defaultWriterClosedPromiseResolve(writer);\n  }\n\n  assert(stream._pendingAbortRequest === undefined);\n  assert(stream._storedError === undefined);\n}\n\nfunction WritableStreamFinishInFlightCloseWithError(stream: WritableStream, error: any) {\n  assert(stream._inFlightCloseRequest !== undefined);\n  stream._inFlightCloseRequest!._reject(error);\n  stream._inFlightCloseRequest = undefined;\n\n  assert(stream._state === 'writable' || stream._state === 'erroring');\n\n  // Never execute sink abort() after sink close().\n  if (stream._pendingAbortRequest !== undefined) {\n    stream._pendingAbortRequest._reject(error);\n    stream._pendingAbortRequest = undefined;\n  }\n  WritableStreamDealWithRejection(stream, error);\n}\n\n// TODO(ricea): Fix alphabetical order.\nfunction WritableStreamCloseQueuedOrInFlight(stream: WritableStream): boolean {\n  if (stream._closeRequest === undefined && stream._inFlightCloseRequest === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamHasOperationMarkedInFlight(stream: WritableStream): boolean {\n  if (stream._inFlightWriteRequest === undefined && stream._inFlightCloseRequest === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamMarkCloseRequestInFlight(stream: WritableStream) {\n  assert(stream._inFlightCloseRequest === undefined);\n  assert(stream._closeRequest !== undefined);\n  stream._inFlightCloseRequest = stream._closeRequest;\n  stream._closeRequest = undefined;\n}\n\nfunction WritableStreamMarkFirstWriteRequestInFlight(stream: WritableStream) {\n  assert(stream._inFlightWriteRequest === undefined);\n  assert(stream._writeRequests.length !== 0);\n  stream._inFlightWriteRequest = stream._writeRequests.shift();\n}\n\nfunction WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream: WritableStream) {\n  assert(stream._state === 'errored');\n  if (stream._closeRequest !== undefined) {\n    assert(stream._inFlightCloseRequest === undefined);\n\n    stream._closeRequest._reject(stream._storedError);\n    stream._closeRequest = undefined;\n  }\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    defaultWriterClosedPromiseReject(writer, stream._storedError);\n  }\n}\n\nfunction WritableStreamUpdateBackpressure(stream: WritableStream, backpressure: boolean) {\n  assert(stream._state === 'writable');\n  assert(!WritableStreamCloseQueuedOrInFlight(stream));\n\n  const writer = stream._writer;\n  if (writer !== undefined && backpressure !== stream._backpressure) {\n    if (backpressure) {\n      defaultWriterReadyPromiseReset(writer);\n    } else {\n      assert(!backpressure);\n\n      defaultWriterReadyPromiseResolve(writer);\n    }\n  }\n\n  stream._backpressure = backpressure;\n}\n\n/**\n * A default writer vended by a {@link WritableStream}.\n *\n * @public\n */\nexport class WritableStreamDefaultWriter<W = any> {\n  /** @internal */\n  _ownerWritableStream: WritableStream<W>;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _closedPromiseState!: 'pending' | 'resolved' | 'rejected';\n  /** @internal */\n  _readyPromise!: Promise<undefined>;\n  /** @internal */\n  _readyPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _readyPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readyPromiseState!: 'pending' | 'fulfilled' | 'rejected';\n\n  constructor(stream: WritableStream<W>) {\n    assertRequiredArgument(stream, 1, 'WritableStreamDefaultWriter');\n    assertWritableStream(stream, 'First parameter');\n\n    if (IsWritableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive writing by another writer');\n    }\n\n    this._ownerWritableStream = stream;\n    stream._writer = this;\n\n    const state = stream._state;\n\n    if (state === 'writable') {\n      if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._backpressure) {\n        defaultWriterReadyPromiseInitialize(this);\n      } else {\n        defaultWriterReadyPromiseInitializeAsResolved(this);\n      }\n\n      defaultWriterClosedPromiseInitialize(this);\n    } else if (state === 'erroring') {\n      defaultWriterReadyPromiseInitializeAsRejected(this, stream._storedError);\n      defaultWriterClosedPromiseInitialize(this);\n    } else if (state === 'closed') {\n      defaultWriterReadyPromiseInitializeAsResolved(this);\n      defaultWriterClosedPromiseInitializeAsResolved(this);\n    } else {\n      assert(state === 'errored');\n\n      const storedError = stream._storedError;\n      defaultWriterReadyPromiseInitializeAsRejected(this, storedError);\n      defaultWriterClosedPromiseInitializeAsRejected(this, storedError);\n    }\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or\n   * the writer’s lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * Returns the desired size to fill the stream’s internal queue. It can be negative, if the queue is over-full.\n   * A producer can use this information to determine the right amount of data to write.\n   *\n   * It will be `null` if the stream cannot be successfully written to (due to either being errored, or having an abort\n   * queued up). It will return zero if the stream is closed. And the getter will throw an exception if invoked when\n   * the writer’s lock is released.\n   */\n  get desiredSize(): number | null {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      throw defaultWriterBrandCheckException('desiredSize');\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      throw defaultWriterLockException('desiredSize');\n    }\n\n    return WritableStreamDefaultWriterGetDesiredSize(this);\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the desired size to fill the stream’s internal queue transitions\n   * from non-positive to positive, signaling that it is no longer applying backpressure. Once the desired size dips\n   * back to zero or below, the getter will return a new promise that stays pending until the next transition.\n   *\n   * If the stream becomes errored or aborted, or the writer’s lock is released, the returned promise will become\n   * rejected.\n   */\n  get ready(): Promise<undefined> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('ready'));\n    }\n\n    return this._readyPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link WritableStream.abort | stream.abort(reason)}.\n   */\n  abort(reason: any = undefined): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('abort'));\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('abort'));\n    }\n\n    return WritableStreamDefaultWriterAbort(this, reason);\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link WritableStream.close | stream.close()}.\n   */\n  close(): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('close'));\n    }\n\n    const stream = this._ownerWritableStream;\n\n    if (stream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('close'));\n    }\n\n    if (WritableStreamCloseQueuedOrInFlight(stream)) {\n      return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));\n    }\n\n    return WritableStreamDefaultWriterClose(this);\n  }\n\n  /**\n   * Releases the writer’s lock on the corresponding stream. After the lock is released, the writer is no longer active.\n   * If the associated stream is errored when the lock is released, the writer will appear errored in the same way from\n   * now on; otherwise, the writer will appear closed.\n   *\n   * Note that the lock can still be released even if some ongoing writes have not yet finished (i.e. even if the\n   * promises returned from previous calls to {@link WritableStreamDefaultWriter.write | write()} have not yet settled).\n   * It’s not necessary to hold the lock on the writer for the duration of the write; the lock instead simply prevents\n   * other producers from writing in an interleaved manner.\n   */\n  releaseLock(): void {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      throw defaultWriterBrandCheckException('releaseLock');\n    }\n\n    const stream = this._ownerWritableStream;\n\n    if (stream === undefined) {\n      return;\n    }\n\n    assert(stream._writer !== undefined);\n\n    WritableStreamDefaultWriterRelease(this);\n  }\n\n  /**\n   * Writes the given chunk to the writable stream, by waiting until any previous writes have finished successfully,\n   * and then sending the chunk to the underlying sink's {@link UnderlyingSink.write | write()} method. It will return\n   * a promise that fulfills with undefined upon a successful write, or rejects if the write fails or stream becomes\n   * errored before the writing process is initiated.\n   *\n   * Note that what \"success\" means is up to the underlying sink; it might indicate simply that the chunk has been\n   * accepted, and not necessarily that it is safely saved to its ultimate destination.\n   */\n  write(chunk: W): Promise<void>;\n  write(chunk: W = undefined!): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('write'));\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('write to'));\n    }\n\n    return WritableStreamDefaultWriterWrite(this, chunk);\n  }\n}\n\nObject.defineProperties(WritableStreamDefaultWriter.prototype, {\n  abort: { enumerable: true },\n  close: { enumerable: true },\n  releaseLock: { enumerable: true },\n  write: { enumerable: true },\n  closed: { enumerable: true },\n  desiredSize: { enumerable: true },\n  ready: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStreamDefaultWriter.prototype, Symbol.toStringTag, {\n    value: 'WritableStreamDefaultWriter',\n    configurable: true\n  });\n}\n\n// Abstract operations for the WritableStreamDefaultWriter.\n\nfunction IsWritableStreamDefaultWriter<W = any>(x: any): x is WritableStreamDefaultWriter<W> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) {\n    return false;\n  }\n\n  return x instanceof WritableStreamDefaultWriter;\n}\n\n// A client of WritableStreamDefaultWriter may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultWriterAbort(writer: WritableStreamDefaultWriter, reason: any) {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  return WritableStreamAbort(stream, reason);\n}\n\nfunction WritableStreamDefaultWriterClose(writer: WritableStreamDefaultWriter): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  return WritableStreamClose(stream);\n}\n\nfunction WritableStreamDefaultWriterCloseWithErrorPropagation(writer: WritableStreamDefaultWriter): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  const state = stream._state;\n  if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {\n    return promiseResolvedWith(undefined);\n  }\n\n  if (state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n\n  return WritableStreamDefaultWriterClose(writer);\n}\n\nfunction WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer: WritableStreamDefaultWriter, error: any) {\n  if (writer._closedPromiseState === 'pending') {\n    defaultWriterClosedPromiseReject(writer, error);\n  } else {\n    defaultWriterClosedPromiseResetToRejected(writer, error);\n  }\n}\n\nfunction WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer: WritableStreamDefaultWriter, error: any) {\n  if (writer._readyPromiseState === 'pending') {\n    defaultWriterReadyPromiseReject(writer, error);\n  } else {\n    defaultWriterReadyPromiseResetToRejected(writer, error);\n  }\n}\n\nfunction WritableStreamDefaultWriterGetDesiredSize(writer: WritableStreamDefaultWriter): number | null {\n  const stream = writer._ownerWritableStream;\n  const state = stream._state;\n\n  if (state === 'errored' || state === 'erroring') {\n    return null;\n  }\n\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return WritableStreamDefaultControllerGetDesiredSize(stream._writableStreamController);\n}\n\nfunction WritableStreamDefaultWriterRelease(writer: WritableStreamDefaultWriter) {\n  const stream = writer._ownerWritableStream;\n  assert(stream !== undefined);\n  assert(stream._writer === writer);\n\n  const releasedError = new TypeError(\n    `Writer was released and can no longer be used to monitor the stream's closedness`);\n\n  WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, releasedError);\n\n  // The state transitions to \"errored\" before the sink abort() method runs, but the writer.closed promise is not\n  // rejected until afterwards. This means that simply testing state will not work.\n  WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, releasedError);\n\n  stream._writer = undefined;\n  writer._ownerWritableStream = undefined!;\n}\n\nfunction WritableStreamDefaultWriterWrite<W>(writer: WritableStreamDefaultWriter<W>, chunk: W): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  const controller = stream._writableStreamController;\n\n  const chunkSize = WritableStreamDefaultControllerGetChunkSize(controller, chunk);\n\n  if (stream !== writer._ownerWritableStream) {\n    return promiseRejectedWith(defaultWriterLockException('write to'));\n  }\n\n  const state = stream._state;\n  if (state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n  if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {\n    return promiseRejectedWith(new TypeError('The stream is closing or closed and cannot be written to'));\n  }\n  if (state === 'erroring') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  assert(state === 'writable');\n\n  const promise = WritableStreamAddWriteRequest(stream);\n\n  WritableStreamDefaultControllerWrite(controller, chunk, chunkSize);\n\n  return promise;\n}\n\nconst closeSentinel: unique symbol = {} as any;\n\ntype QueueRecord<W> = W | typeof closeSentinel;\n\n/**\n * Allows control of a {@link WritableStream | writable stream}'s state and internal queue.\n *\n * @public\n */\nexport class WritableStreamDefaultController<W = any> {\n  /** @internal */\n  _controlledWritableStream!: WritableStream<W>;\n  /** @internal */\n  _queue!: SimpleQueue<QueuePair<QueueRecord<W>>>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _abortReason: any;\n  /** @internal */\n  _abortController: AbortController | undefined;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _strategySizeAlgorithm!: QueuingStrategySizeCallback<W>;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _writeAlgorithm!: (chunk: W) => Promise<void>;\n  /** @internal */\n  _closeAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _abortAlgorithm!: (reason: any) => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * The reason which was passed to `WritableStream.abort(reason)` when the stream was aborted.\n   *\n   * @deprecated\n   *  This property has been removed from the specification, see https://github.com/whatwg/streams/pull/1177.\n   *  Use {@link WritableStreamDefaultController.signal}'s `reason` instead.\n   */\n  get abortReason(): any {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('abortReason');\n    }\n    return this._abortReason;\n  }\n\n  /**\n   * An `AbortSignal` that can be used to abort the pending write or close operation when the stream is aborted.\n   */\n  get signal(): AbortSignal {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('signal');\n    }\n    if (this._abortController === undefined) {\n      // Older browsers or older Node versions may not support `AbortController` or `AbortSignal`.\n      // We don't want to bundle and ship an `AbortController` polyfill together with our polyfill,\n      // so instead we only implement support for `signal` if we find a global `AbortController` constructor.\n      throw new TypeError('WritableStreamDefaultController.prototype.signal is not supported');\n    }\n    return this._abortController.signal;\n  }\n\n  /**\n   * Closes the controlled writable stream, making all future interactions with it fail with the given error `e`.\n   *\n   * This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying\n   * sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the\n   * normal lifecycle of interactions with the underlying sink.\n   */\n  error(e: any = undefined): void {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n    const state = this._controlledWritableStream._state;\n    if (state !== 'writable') {\n      // The stream is closed, errored or will be soon. The sink can't do anything useful if it gets an error here, so\n      // just treat it as a no-op.\n      return;\n    }\n\n    WritableStreamDefaultControllerError(this, e);\n  }\n\n  /** @internal */\n  [AbortSteps](reason: any): Promise<void> {\n    const result = this._abortAlgorithm(reason);\n    WritableStreamDefaultControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [ErrorSteps]() {\n    ResetQueue(this);\n  }\n}\n\nObject.defineProperties(WritableStreamDefaultController.prototype, {\n  abortReason: { enumerable: true },\n  signal: { enumerable: true },\n  error: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'WritableStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Abstract operations implementing interface required by the WritableStream.\n\nfunction IsWritableStreamDefaultController(x: any): x is WritableStreamDefaultController<any> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledWritableStream')) {\n    return false;\n  }\n\n  return x instanceof WritableStreamDefaultController;\n}\n\nfunction SetUpWritableStreamDefaultController<W>(stream: WritableStream<W>,\n                                                 controller: WritableStreamDefaultController<W>,\n                                                 startAlgorithm: () => void | PromiseLike<void>,\n                                                 writeAlgorithm: (chunk: W) => Promise<void>,\n                                                 closeAlgorithm: () => Promise<void>,\n                                                 abortAlgorithm: (reason: any) => Promise<void>,\n                                                 highWaterMark: number,\n                                                 sizeAlgorithm: QueuingStrategySizeCallback<W>) {\n  assert(IsWritableStream(stream));\n  assert(stream._writableStreamController === undefined);\n\n  controller._controlledWritableStream = stream;\n  stream._writableStreamController = controller;\n\n  // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n  controller._queue = undefined!;\n  controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._abortReason = undefined;\n  controller._abortController = createAbortController();\n  controller._started = false;\n\n  controller._strategySizeAlgorithm = sizeAlgorithm;\n  controller._strategyHWM = highWaterMark;\n\n  controller._writeAlgorithm = writeAlgorithm;\n  controller._closeAlgorithm = closeAlgorithm;\n  controller._abortAlgorithm = abortAlgorithm;\n\n  const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n  WritableStreamUpdateBackpressure(stream, backpressure);\n\n  const startResult = startAlgorithm();\n  const startPromise = promiseResolvedWith(startResult);\n  uponPromise(\n    startPromise,\n    () => {\n      assert(stream._state === 'writable' || stream._state === 'erroring');\n      controller._started = true;\n      WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n    },\n    r => {\n      assert(stream._state === 'writable' || stream._state === 'erroring');\n      controller._started = true;\n      WritableStreamDealWithRejection(stream, r);\n    }\n  );\n}\n\nfunction SetUpWritableStreamDefaultControllerFromUnderlyingSink<W>(stream: WritableStream<W>,\n                                                                   underlyingSink: ValidatedUnderlyingSink<W>,\n                                                                   highWaterMark: number,\n                                                                   sizeAlgorithm: QueuingStrategySizeCallback<W>) {\n  const controller = Object.create(WritableStreamDefaultController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let writeAlgorithm: (chunk: W) => Promise<void> = () => promiseResolvedWith(undefined);\n  let closeAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let abortAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingSink.start !== undefined) {\n    startAlgorithm = () => underlyingSink.start!(controller);\n  }\n  if (underlyingSink.write !== undefined) {\n    writeAlgorithm = chunk => underlyingSink.write!(chunk, controller);\n  }\n  if (underlyingSink.close !== undefined) {\n    closeAlgorithm = () => underlyingSink.close!();\n  }\n  if (underlyingSink.abort !== undefined) {\n    abortAlgorithm = reason => underlyingSink.abort!(reason);\n  }\n\n  SetUpWritableStreamDefaultController(\n    stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm\n  );\n}\n\n// ClearAlgorithms may be called twice. Erroring the same stream in multiple ways will often result in redundant calls.\nfunction WritableStreamDefaultControllerClearAlgorithms(controller: WritableStreamDefaultController<any>) {\n  controller._writeAlgorithm = undefined!;\n  controller._closeAlgorithm = undefined!;\n  controller._abortAlgorithm = undefined!;\n  controller._strategySizeAlgorithm = undefined!;\n}\n\nfunction WritableStreamDefaultControllerClose<W>(controller: WritableStreamDefaultController<W>) {\n  EnqueueValueWithSize(controller, closeSentinel, 0);\n  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\nfunction WritableStreamDefaultControllerGetChunkSize<W>(controller: WritableStreamDefaultController<W>,\n                                                        chunk: W): number {\n  try {\n    return controller._strategySizeAlgorithm(chunk);\n  } catch (chunkSizeE) {\n    WritableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE);\n    return 1;\n  }\n}\n\nfunction WritableStreamDefaultControllerGetDesiredSize(controller: WritableStreamDefaultController<any>): number {\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\nfunction WritableStreamDefaultControllerWrite<W>(controller: WritableStreamDefaultController<W>,\n                                                 chunk: W,\n                                                 chunkSize: number) {\n  try {\n    EnqueueValueWithSize(controller, chunk, chunkSize);\n  } catch (enqueueE) {\n    WritableStreamDefaultControllerErrorIfNeeded(controller, enqueueE);\n    return;\n  }\n\n  const stream = controller._controlledWritableStream;\n  if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._state === 'writable') {\n    const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n    WritableStreamUpdateBackpressure(stream, backpressure);\n  }\n\n  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\n// Abstract operations for the WritableStreamDefaultController.\n\nfunction WritableStreamDefaultControllerAdvanceQueueIfNeeded<W>(controller: WritableStreamDefaultController<W>) {\n  const stream = controller._controlledWritableStream;\n\n  if (!controller._started) {\n    return;\n  }\n\n  if (stream._inFlightWriteRequest !== undefined) {\n    return;\n  }\n\n  const state = stream._state;\n  assert(state !== 'closed' && state !== 'errored');\n  if (state === 'erroring') {\n    WritableStreamFinishErroring(stream);\n    return;\n  }\n\n  if (controller._queue.length === 0) {\n    return;\n  }\n\n  const value = PeekQueueValue(controller);\n  if (value === closeSentinel) {\n    WritableStreamDefaultControllerProcessClose(controller);\n  } else {\n    WritableStreamDefaultControllerProcessWrite(controller, value);\n  }\n}\n\nfunction WritableStreamDefaultControllerErrorIfNeeded(controller: WritableStreamDefaultController<any>, error: any) {\n  if (controller._controlledWritableStream._state === 'writable') {\n    WritableStreamDefaultControllerError(controller, error);\n  }\n}\n\nfunction WritableStreamDefaultControllerProcessClose(controller: WritableStreamDefaultController<any>) {\n  const stream = controller._controlledWritableStream;\n\n  WritableStreamMarkCloseRequestInFlight(stream);\n\n  DequeueValue(controller);\n  assert(controller._queue.length === 0);\n\n  const sinkClosePromise = controller._closeAlgorithm();\n  WritableStreamDefaultControllerClearAlgorithms(controller);\n  uponPromise(\n    sinkClosePromise,\n    () => {\n      WritableStreamFinishInFlightClose(stream);\n    },\n    reason => {\n      WritableStreamFinishInFlightCloseWithError(stream, reason);\n    }\n  );\n}\n\nfunction WritableStreamDefaultControllerProcessWrite<W>(controller: WritableStreamDefaultController<W>, chunk: W) {\n  const stream = controller._controlledWritableStream;\n\n  WritableStreamMarkFirstWriteRequestInFlight(stream);\n\n  const sinkWritePromise = controller._writeAlgorithm(chunk);\n  uponPromise(\n    sinkWritePromise,\n    () => {\n      WritableStreamFinishInFlightWrite(stream);\n\n      const state = stream._state;\n      assert(state === 'writable' || state === 'erroring');\n\n      DequeueValue(controller);\n\n      if (!WritableStreamCloseQueuedOrInFlight(stream) && state === 'writable') {\n        const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n        WritableStreamUpdateBackpressure(stream, backpressure);\n      }\n\n      WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n    },\n    reason => {\n      if (stream._state === 'writable') {\n        WritableStreamDefaultControllerClearAlgorithms(controller);\n      }\n      WritableStreamFinishInFlightWriteWithError(stream, reason);\n    }\n  );\n}\n\nfunction WritableStreamDefaultControllerGetBackpressure(controller: WritableStreamDefaultController<any>): boolean {\n  const desiredSize = WritableStreamDefaultControllerGetDesiredSize(controller);\n  return desiredSize <= 0;\n}\n\n// A client of WritableStreamDefaultController may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultControllerError(controller: WritableStreamDefaultController<any>, error: any) {\n  const stream = controller._controlledWritableStream;\n\n  assert(stream._state === 'writable');\n\n  WritableStreamDefaultControllerClearAlgorithms(controller);\n  WritableStreamStartErroring(stream, error);\n}\n\n// Helper functions for the WritableStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(`WritableStream.prototype.${name} can only be used on a WritableStream`);\n}\n\n// Helper functions for the WritableStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `WritableStreamDefaultController.prototype.${name} can only be used on a WritableStreamDefaultController`);\n}\n\n\n// Helper functions for the WritableStreamDefaultWriter.\n\nfunction defaultWriterBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `WritableStreamDefaultWriter.prototype.${name} can only be used on a WritableStreamDefaultWriter`);\n}\n\nfunction defaultWriterLockException(name: string): TypeError {\n  return new TypeError('Cannot ' + name + ' a stream using a released writer');\n}\n\nfunction defaultWriterClosedPromiseInitialize(writer: WritableStreamDefaultWriter) {\n  writer._closedPromise = newPromise((resolve, reject) => {\n    writer._closedPromise_resolve = resolve;\n    writer._closedPromise_reject = reject;\n    writer._closedPromiseState = 'pending';\n  });\n}\n\nfunction defaultWriterClosedPromiseInitializeAsRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  defaultWriterClosedPromiseInitialize(writer);\n  defaultWriterClosedPromiseReject(writer, reason);\n}\n\nfunction defaultWriterClosedPromiseInitializeAsResolved(writer: WritableStreamDefaultWriter) {\n  defaultWriterClosedPromiseInitialize(writer);\n  defaultWriterClosedPromiseResolve(writer);\n}\n\nfunction defaultWriterClosedPromiseReject(writer: WritableStreamDefaultWriter, reason: any) {\n  if (writer._closedPromise_reject === undefined) {\n    return;\n  }\n  assert(writer._closedPromiseState === 'pending');\n\n  setPromiseIsHandledToTrue(writer._closedPromise);\n  writer._closedPromise_reject(reason);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'rejected';\n}\n\nfunction defaultWriterClosedPromiseResetToRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  assert(writer._closedPromise_resolve === undefined);\n  assert(writer._closedPromise_reject === undefined);\n  assert(writer._closedPromiseState !== 'pending');\n\n  defaultWriterClosedPromiseInitializeAsRejected(writer, reason);\n}\n\nfunction defaultWriterClosedPromiseResolve(writer: WritableStreamDefaultWriter) {\n  if (writer._closedPromise_resolve === undefined) {\n    return;\n  }\n  assert(writer._closedPromiseState === 'pending');\n\n  writer._closedPromise_resolve(undefined);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'resolved';\n}\n\nfunction defaultWriterReadyPromiseInitialize(writer: WritableStreamDefaultWriter) {\n  writer._readyPromise = newPromise((resolve, reject) => {\n    writer._readyPromise_resolve = resolve;\n    writer._readyPromise_reject = reject;\n  });\n  writer._readyPromiseState = 'pending';\n}\n\nfunction defaultWriterReadyPromiseInitializeAsRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  defaultWriterReadyPromiseInitialize(writer);\n  defaultWriterReadyPromiseReject(writer, reason);\n}\n\nfunction defaultWriterReadyPromiseInitializeAsResolved(writer: WritableStreamDefaultWriter) {\n  defaultWriterReadyPromiseInitialize(writer);\n  defaultWriterReadyPromiseResolve(writer);\n}\n\nfunction defaultWriterReadyPromiseReject(writer: WritableStreamDefaultWriter, reason: any) {\n  if (writer._readyPromise_reject === undefined) {\n    return;\n  }\n\n  setPromiseIsHandledToTrue(writer._readyPromise);\n  writer._readyPromise_reject(reason);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'rejected';\n}\n\nfunction defaultWriterReadyPromiseReset(writer: WritableStreamDefaultWriter) {\n  assert(writer._readyPromise_resolve === undefined);\n  assert(writer._readyPromise_reject === undefined);\n\n  defaultWriterReadyPromiseInitialize(writer);\n}\n\nfunction defaultWriterReadyPromiseResetToRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  assert(writer._readyPromise_resolve === undefined);\n  assert(writer._readyPromise_reject === undefined);\n\n  defaultWriterReadyPromiseInitializeAsRejected(writer, reason);\n}\n\nfunction defaultWriterReadyPromiseResolve(writer: WritableStreamDefaultWriter) {\n  if (writer._readyPromise_resolve === undefined) {\n    return;\n  }\n\n  writer._readyPromise_resolve(undefined);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'fulfilled';\n}\n","/// <reference lib=\"dom\" />\nexport const NativeDOMException: typeof DOMException | undefined =\n  typeof DOMException !== 'undefined' ? DOMException : undefined;\n","/// <reference types=\"node\" />\nimport { NativeDOMException } from './native';\n\ndeclare class DOMExceptionClass extends Error {\n  constructor(message?: string, name?: string);\n\n  name: string;\n  message: string;\n}\n\ntype DOMException = DOMExceptionClass;\ntype DOMExceptionConstructor = typeof DOMExceptionClass;\n\nfunction isDOMExceptionConstructor(ctor: unknown): ctor is DOMExceptionConstructor {\n  if (!(typeof ctor === 'function' || typeof ctor === 'object')) {\n    return false;\n  }\n  try {\n    new (ctor as DOMExceptionConstructor)();\n    return true;\n  } catch {\n    return false;\n  }\n}\n\nfunction createDOMExceptionPolyfill(): DOMExceptionConstructor {\n  // eslint-disable-next-line no-shadow\n  const ctor = function DOMException(this: DOMException, message?: string, name?: string) {\n    this.message = message || '';\n    this.name = name || 'Error';\n    if (Error.captureStackTrace) {\n      Error.captureStackTrace(this, this.constructor);\n    }\n  } as any;\n  ctor.prototype = Object.create(Error.prototype);\n  Object.defineProperty(ctor.prototype, 'constructor', { value: ctor, writable: true, configurable: true });\n  return ctor;\n}\n\n// eslint-disable-next-line no-redeclare\nconst DOMException: DOMExceptionConstructor =\n  isDOMExceptionConstructor(NativeDOMException) ? NativeDOMException : createDOMExceptionPolyfill();\n\nexport { DOMException };\n","import { IsReadableStream, IsReadableStreamLocked, ReadableStream, ReadableStreamCancel } from '../readable-stream';\nimport { AcquireReadableStreamDefaultReader, ReadableStreamDefaultReaderRead } from './default-reader';\nimport { ReadableStreamReaderGenericRelease } from './generic-reader';\nimport {\n  AcquireWritableStreamDefaultWriter,\n  IsWritableStream,\n  IsWritableStreamLocked,\n  WritableStream,\n  WritableStreamAbort,\n  WritableStreamCloseQueuedOrInFlight,\n  WritableStreamDefaultWriterCloseWithErrorPropagation,\n  WritableStreamDefaultWriterRelease,\n  WritableStreamDefaultWriterWrite\n} from '../writable-stream';\nimport assert from '../../stub/assert';\nimport {\n  newPromise,\n  PerformPromiseThen,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  uponFulfillment,\n  uponPromise,\n  uponRejection\n} from '../helpers/webidl';\nimport { noop } from '../../utils';\nimport { AbortSignal, isAbortSignal } from '../abort-signal';\nimport { DOMException } from '../../stub/dom-exception';\n\nexport function ReadableStreamPipeTo<T>(source: ReadableStream<T>,\n                                        dest: WritableStream<T>,\n                                        preventClose: boolean,\n                                        preventAbort: boolean,\n                                        preventCancel: boolean,\n                                        signal: AbortSignal | undefined): Promise<undefined> {\n  assert(IsReadableStream(source));\n  assert(IsWritableStream(dest));\n  assert(typeof preventClose === 'boolean');\n  assert(typeof preventAbort === 'boolean');\n  assert(typeof preventCancel === 'boolean');\n  assert(signal === undefined || isAbortSignal(signal));\n  assert(!IsReadableStreamLocked(source));\n  assert(!IsWritableStreamLocked(dest));\n\n  const reader = AcquireReadableStreamDefaultReader<T>(source);\n  const writer = AcquireWritableStreamDefaultWriter<T>(dest);\n\n  source._disturbed = true;\n\n  let shuttingDown = false;\n\n  // This is used to keep track of the spec's requirement that we wait for ongoing writes during shutdown.\n  let currentWrite = promiseResolvedWith<void>(undefined);\n\n  return newPromise((resolve, reject) => {\n    let abortAlgorithm: () => void;\n    if (signal !== undefined) {\n      abortAlgorithm = () => {\n        const error = new DOMException('Aborted', 'AbortError');\n        const actions: Array<() => Promise<void>> = [];\n        if (!preventAbort) {\n          actions.push(() => {\n            if (dest._state === 'writable') {\n              return WritableStreamAbort(dest, error);\n            }\n            return promiseResolvedWith(undefined);\n          });\n        }\n        if (!preventCancel) {\n          actions.push(() => {\n            if (source._state === 'readable') {\n              return ReadableStreamCancel(source, error);\n            }\n            return promiseResolvedWith(undefined);\n          });\n        }\n        shutdownWithAction(() => Promise.all(actions.map(action => action())), true, error);\n      };\n\n      if (signal.aborted) {\n        abortAlgorithm();\n        return;\n      }\n\n      signal.addEventListener('abort', abortAlgorithm);\n    }\n\n    // Using reader and writer, read all chunks from this and write them to dest\n    // - Backpressure must be enforced\n    // - Shutdown must stop all activity\n    function pipeLoop() {\n      return newPromise<void>((resolveLoop, rejectLoop) => {\n        function next(done: boolean) {\n          if (done) {\n            resolveLoop();\n          } else {\n            // Use `PerformPromiseThen` instead of `uponPromise` to avoid\n            // adding unnecessary `.catch(rethrowAssertionErrorRejection)` handlers\n            PerformPromiseThen(pipeStep(), next, rejectLoop);\n          }\n        }\n\n        next(false);\n      });\n    }\n\n    function pipeStep(): Promise<boolean> {\n      if (shuttingDown) {\n        return promiseResolvedWith(true);\n      }\n\n      return PerformPromiseThen(writer._readyPromise, () => {\n        return newPromise<boolean>((resolveRead, rejectRead) => {\n          ReadableStreamDefaultReaderRead(\n            reader,\n            {\n              _chunkSteps: chunk => {\n                currentWrite = PerformPromiseThen(WritableStreamDefaultWriterWrite(writer, chunk), undefined, noop);\n                resolveRead(false);\n              },\n              _closeSteps: () => resolveRead(true),\n              _errorSteps: rejectRead\n            }\n          );\n        });\n      });\n    }\n\n    // Errors must be propagated forward\n    isOrBecomesErrored(source, reader._closedPromise, storedError => {\n      if (!preventAbort) {\n        shutdownWithAction(() => WritableStreamAbort(dest, storedError), true, storedError);\n      } else {\n        shutdown(true, storedError);\n      }\n    });\n\n    // Errors must be propagated backward\n    isOrBecomesErrored(dest, writer._closedPromise, storedError => {\n      if (!preventCancel) {\n        shutdownWithAction(() => ReadableStreamCancel(source, storedError), true, storedError);\n      } else {\n        shutdown(true, storedError);\n      }\n    });\n\n    // Closing must be propagated forward\n    isOrBecomesClosed(source, reader._closedPromise, () => {\n      if (!preventClose) {\n        shutdownWithAction(() => WritableStreamDefaultWriterCloseWithErrorPropagation(writer));\n      } else {\n        shutdown();\n      }\n    });\n\n    // Closing must be propagated backward\n    if (WritableStreamCloseQueuedOrInFlight(dest) || dest._state === 'closed') {\n      const destClosed = new TypeError('the destination writable stream closed before all data could be piped to it');\n\n      if (!preventCancel) {\n        shutdownWithAction(() => ReadableStreamCancel(source, destClosed), true, destClosed);\n      } else {\n        shutdown(true, destClosed);\n      }\n    }\n\n    setPromiseIsHandledToTrue(pipeLoop());\n\n    function waitForWritesToFinish(): Promise<void> {\n      // Another write may have started while we were waiting on this currentWrite, so we have to be sure to wait\n      // for that too.\n      const oldCurrentWrite = currentWrite;\n      return PerformPromiseThen(\n        currentWrite,\n        () => oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined\n      );\n    }\n\n    function isOrBecomesErrored(stream: ReadableStream | WritableStream,\n                                promise: Promise<void>,\n                                action: (reason: any) => void) {\n      if (stream._state === 'errored') {\n        action(stream._storedError);\n      } else {\n        uponRejection(promise, action);\n      }\n    }\n\n    function isOrBecomesClosed(stream: ReadableStream | WritableStream, promise: Promise<void>, action: () => void) {\n      if (stream._state === 'closed') {\n        action();\n      } else {\n        uponFulfillment(promise, action);\n      }\n    }\n\n    function shutdownWithAction(action: () => Promise<unknown>, originalIsError?: boolean, originalError?: any) {\n      if (shuttingDown) {\n        return;\n      }\n      shuttingDown = true;\n\n      if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {\n        uponFulfillment(waitForWritesToFinish(), doTheRest);\n      } else {\n        doTheRest();\n      }\n\n      function doTheRest() {\n        uponPromise(\n          action(),\n          () => finalize(originalIsError, originalError),\n          newError => finalize(true, newError)\n        );\n      }\n    }\n\n    function shutdown(isError?: boolean, error?: any) {\n      if (shuttingDown) {\n        return;\n      }\n      shuttingDown = true;\n\n      if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {\n        uponFulfillment(waitForWritesToFinish(), () => finalize(isError, error));\n      } else {\n        finalize(isError, error);\n      }\n    }\n\n    function finalize(isError?: boolean, error?: any) {\n      WritableStreamDefaultWriterRelease(writer);\n      ReadableStreamReaderGenericRelease(reader);\n\n      if (signal !== undefined) {\n        signal.removeEventListener('abort', abortAlgorithm);\n      }\n      if (isError) {\n        reject(error);\n      } else {\n        resolve(undefined);\n      }\n    }\n  });\n}\n","import { QueuingStrategySizeCallback } from '../queuing-strategy';\nimport assert from '../../stub/assert';\nimport { DequeueValue, EnqueueValueWithSize, QueuePair, ResetQueue } from '../abstract-ops/queue-with-sizes';\nimport {\n  ReadableStreamAddReadRequest,\n  ReadableStreamFulfillReadRequest,\n  ReadableStreamGetNumReadRequests,\n  ReadRequest\n} from './default-reader';\nimport { SimpleQueue } from '../simple-queue';\nimport { IsReadableStreamLocked, ReadableStream, ReadableStreamClose, ReadableStreamError } from '../readable-stream';\nimport { ValidatedUnderlyingSource } from './underlying-source';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { CancelSteps, PullSteps } from '../abstract-ops/internal-methods';\nimport { promiseResolvedWith, uponPromise } from '../helpers/webidl';\n\n/**\n * Allows control of a {@link ReadableStream | readable stream}'s state and internal queue.\n *\n * @public\n */\nexport class ReadableStreamDefaultController<R> {\n  /** @internal */\n  _controlledReadableStream!: ReadableStream<R>;\n  /** @internal */\n  _queue!: SimpleQueue<QueuePair<R>>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _closeRequested!: boolean;\n  /** @internal */\n  _pullAgain!: boolean;\n  /** @internal */\n  _pulling !: boolean;\n  /** @internal */\n  _strategySizeAlgorithm!: QueuingStrategySizeCallback<R>;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _pullAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _cancelAlgorithm!: (reason: any) => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is\n   * over-full. An underlying source ought to use this information to determine when and how to apply backpressure.\n   */\n  get desiredSize(): number | null {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('desiredSize');\n    }\n\n    return ReadableStreamDefaultControllerGetDesiredSize(this);\n  }\n\n  /**\n   * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from\n   * the stream, but once those are read, the stream will become closed.\n   */\n  close(): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('close');\n    }\n\n    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {\n      throw new TypeError('The stream is not in a state that permits close');\n    }\n\n    ReadableStreamDefaultControllerClose(this);\n  }\n\n  /**\n   * Enqueues the given chunk `chunk` in the controlled readable stream.\n   */\n  enqueue(chunk: R): void;\n  enqueue(chunk: R = undefined!): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('enqueue');\n    }\n\n    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {\n      throw new TypeError('The stream is not in a state that permits enqueue');\n    }\n\n    return ReadableStreamDefaultControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.\n   */\n  error(e: any = undefined): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n\n    ReadableStreamDefaultControllerError(this, e);\n  }\n\n  /** @internal */\n  [CancelSteps](reason: any): Promise<void> {\n    ResetQueue(this);\n    const result = this._cancelAlgorithm(reason);\n    ReadableStreamDefaultControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [PullSteps](readRequest: ReadRequest<R>): void {\n    const stream = this._controlledReadableStream;\n\n    if (this._queue.length > 0) {\n      const chunk = DequeueValue(this);\n\n      if (this._closeRequested && this._queue.length === 0) {\n        ReadableStreamDefaultControllerClearAlgorithms(this);\n        ReadableStreamClose(stream);\n      } else {\n        ReadableStreamDefaultControllerCallPullIfNeeded(this);\n      }\n\n      readRequest._chunkSteps(chunk);\n    } else {\n      ReadableStreamAddReadRequest(stream, readRequest);\n      ReadableStreamDefaultControllerCallPullIfNeeded(this);\n    }\n  }\n}\n\nObject.defineProperties(ReadableStreamDefaultController.prototype, {\n  close: { enumerable: true },\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Abstract operations for the ReadableStreamDefaultController.\n\nfunction IsReadableStreamDefaultController<R = any>(x: any): x is ReadableStreamDefaultController<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableStream')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamDefaultController;\n}\n\nfunction ReadableStreamDefaultControllerCallPullIfNeeded(controller: ReadableStreamDefaultController<any>): void {\n  const shouldPull = ReadableStreamDefaultControllerShouldCallPull(controller);\n  if (!shouldPull) {\n    return;\n  }\n\n  if (controller._pulling) {\n    controller._pullAgain = true;\n    return;\n  }\n\n  assert(!controller._pullAgain);\n\n  controller._pulling = true;\n\n  const pullPromise = controller._pullAlgorithm();\n  uponPromise(\n    pullPromise,\n    () => {\n      controller._pulling = false;\n\n      if (controller._pullAgain) {\n        controller._pullAgain = false;\n        ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n      }\n    },\n    e => {\n      ReadableStreamDefaultControllerError(controller, e);\n    }\n  );\n}\n\nfunction ReadableStreamDefaultControllerShouldCallPull(controller: ReadableStreamDefaultController<any>): boolean {\n  const stream = controller._controlledReadableStream;\n\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return false;\n  }\n\n  if (!controller._started) {\n    return false;\n  }\n\n  if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    return true;\n  }\n\n  const desiredSize = ReadableStreamDefaultControllerGetDesiredSize(controller);\n  assert(desiredSize !== null);\n  if (desiredSize! > 0) {\n    return true;\n  }\n\n  return false;\n}\n\nfunction ReadableStreamDefaultControllerClearAlgorithms(controller: ReadableStreamDefaultController<any>) {\n  controller._pullAlgorithm = undefined!;\n  controller._cancelAlgorithm = undefined!;\n  controller._strategySizeAlgorithm = undefined!;\n}\n\n// A client of ReadableStreamDefaultController may use these functions directly to bypass state check.\n\nexport function ReadableStreamDefaultControllerClose(controller: ReadableStreamDefaultController<any>) {\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return;\n  }\n\n  const stream = controller._controlledReadableStream;\n\n  controller._closeRequested = true;\n\n  if (controller._queue.length === 0) {\n    ReadableStreamDefaultControllerClearAlgorithms(controller);\n    ReadableStreamClose(stream);\n  }\n}\n\nexport function ReadableStreamDefaultControllerEnqueue<R>(\n  controller: ReadableStreamDefaultController<R>,\n  chunk: R\n): void {\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return;\n  }\n\n  const stream = controller._controlledReadableStream;\n\n  if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    ReadableStreamFulfillReadRequest(stream, chunk, false);\n  } else {\n    let chunkSize;\n    try {\n      chunkSize = controller._strategySizeAlgorithm(chunk);\n    } catch (chunkSizeE) {\n      ReadableStreamDefaultControllerError(controller, chunkSizeE);\n      throw chunkSizeE;\n    }\n\n    try {\n      EnqueueValueWithSize(controller, chunk, chunkSize);\n    } catch (enqueueE) {\n      ReadableStreamDefaultControllerError(controller, enqueueE);\n      throw enqueueE;\n    }\n  }\n\n  ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n}\n\nexport function ReadableStreamDefaultControllerError(controller: ReadableStreamDefaultController<any>, e: any) {\n  const stream = controller._controlledReadableStream;\n\n  if (stream._state !== 'readable') {\n    return;\n  }\n\n  ResetQueue(controller);\n\n  ReadableStreamDefaultControllerClearAlgorithms(controller);\n  ReadableStreamError(stream, e);\n}\n\nexport function ReadableStreamDefaultControllerGetDesiredSize(\n  controller: ReadableStreamDefaultController<any>\n): number | null {\n  const state = controller._controlledReadableStream._state;\n\n  if (state === 'errored') {\n    return null;\n  }\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\n// This is used in the implementation of TransformStream.\nexport function ReadableStreamDefaultControllerHasBackpressure(\n  controller: ReadableStreamDefaultController<any>\n): boolean {\n  if (ReadableStreamDefaultControllerShouldCallPull(controller)) {\n    return false;\n  }\n\n  return true;\n}\n\nexport function ReadableStreamDefaultControllerCanCloseOrEnqueue(\n  controller: ReadableStreamDefaultController<any>\n): boolean {\n  const state = controller._controlledReadableStream._state;\n\n  if (!controller._closeRequested && state === 'readable') {\n    return true;\n  }\n\n  return false;\n}\n\nexport function SetUpReadableStreamDefaultController<R>(stream: ReadableStream<R>,\n                                                        controller: ReadableStreamDefaultController<R>,\n                                                        startAlgorithm: () => void | PromiseLike<void>,\n                                                        pullAlgorithm: () => Promise<void>,\n                                                        cancelAlgorithm: (reason: any) => Promise<void>,\n                                                        highWaterMark: number,\n                                                        sizeAlgorithm: QueuingStrategySizeCallback<R>) {\n  assert(stream._readableStreamController === undefined);\n\n  controller._controlledReadableStream = stream;\n\n  controller._queue = undefined!;\n  controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._started = false;\n  controller._closeRequested = false;\n  controller._pullAgain = false;\n  controller._pulling = false;\n\n  controller._strategySizeAlgorithm = sizeAlgorithm;\n  controller._strategyHWM = highWaterMark;\n\n  controller._pullAlgorithm = pullAlgorithm;\n  controller._cancelAlgorithm = cancelAlgorithm;\n\n  stream._readableStreamController = controller;\n\n  const startResult = startAlgorithm();\n  uponPromise(\n    promiseResolvedWith(startResult),\n    () => {\n      controller._started = true;\n\n      assert(!controller._pulling);\n      assert(!controller._pullAgain);\n\n      ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n    },\n    r => {\n      ReadableStreamDefaultControllerError(controller, r);\n    }\n  );\n}\n\nexport function SetUpReadableStreamDefaultControllerFromUnderlyingSource<R>(\n  stream: ReadableStream<R>,\n  underlyingSource: ValidatedUnderlyingSource<R>,\n  highWaterMark: number,\n  sizeAlgorithm: QueuingStrategySizeCallback<R>\n) {\n  const controller: ReadableStreamDefaultController<R> = Object.create(ReadableStreamDefaultController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let pullAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let cancelAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingSource.start !== undefined) {\n    startAlgorithm = () => underlyingSource.start!(controller);\n  }\n  if (underlyingSource.pull !== undefined) {\n    pullAlgorithm = () => underlyingSource.pull!(controller);\n  }\n  if (underlyingSource.cancel !== undefined) {\n    cancelAlgorithm = reason => underlyingSource.cancel!(reason);\n  }\n\n  SetUpReadableStreamDefaultController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm\n  );\n}\n\n// Helper functions for the ReadableStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamDefaultController.prototype.${name} can only be used on a ReadableStreamDefaultController`);\n}\n","import {\n  CreateReadableByteStream,\n  CreateReadableStream,\n  IsReadableStream,\n  ReadableByteStream,\n  ReadableStream,\n  ReadableStreamCancel,\n  ReadableStreamReader\n} from '../readable-stream';\nimport { ReadableStreamReaderGenericRelease } from './generic-reader';\nimport {\n  AcquireReadableStreamDefaultReader,\n  IsReadableStreamDefaultReader,\n  ReadableStreamDefaultReaderRead,\n  ReadRequest\n} from './default-reader';\nimport {\n  AcquireReadableStreamBYOBReader,\n  IsReadableStreamBYOBReader,\n  ReadableStreamBYOBReaderRead,\n  ReadIntoRequest\n} from './byob-reader';\nimport assert from '../../stub/assert';\nimport { newPromise, promiseResolvedWith, queueMicrotask, uponRejection } from '../helpers/webidl';\nimport {\n  ReadableStreamDefaultController,\n  ReadableStreamDefaultControllerClose,\n  ReadableStreamDefaultControllerEnqueue,\n  ReadableStreamDefaultControllerError\n} from './default-controller';\nimport {\n  IsReadableByteStreamController,\n  ReadableByteStreamControllerClose,\n  ReadableByteStreamControllerEnqueue,\n  ReadableByteStreamControllerError,\n  ReadableByteStreamControllerGetBYOBRequest,\n  ReadableByteStreamControllerRespond,\n  ReadableByteStreamControllerRespondWithNewView\n} from './byte-stream-controller';\nimport { CreateArrayFromList } from '../abstract-ops/ecmascript';\nimport { CloneAsUint8Array } from '../abstract-ops/miscellaneous';\n\nexport function ReadableStreamTee<R>(stream: ReadableStream<R>,\n                                     cloneForBranch2: boolean): [ReadableStream<R>, ReadableStream<R>] {\n  assert(IsReadableStream(stream));\n  assert(typeof cloneForBranch2 === 'boolean');\n  if (IsReadableByteStreamController(stream._readableStreamController)) {\n    return ReadableByteStreamTee(stream as unknown as ReadableByteStream) as\n      unknown as [ReadableStream<R>, ReadableStream<R>];\n  }\n  return ReadableStreamDefaultTee(stream, cloneForBranch2);\n}\n\nexport function ReadableStreamDefaultTee<R>(stream: ReadableStream<R>,\n                                            cloneForBranch2: boolean): [ReadableStream<R>, ReadableStream<R>] {\n  assert(IsReadableStream(stream));\n  assert(typeof cloneForBranch2 === 'boolean');\n\n  const reader = AcquireReadableStreamDefaultReader<R>(stream);\n\n  let reading = false;\n  let readAgain = false;\n  let canceled1 = false;\n  let canceled2 = false;\n  let reason1: any;\n  let reason2: any;\n  let branch1: ReadableStream<R>;\n  let branch2: ReadableStream<R>;\n\n  let resolveCancelPromise: (value: undefined | Promise<undefined>) => void;\n  const cancelPromise = newPromise<undefined>(resolve => {\n    resolveCancelPromise = resolve;\n  });\n\n  function pullAlgorithm(): Promise<void> {\n    if (reading) {\n      readAgain = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgain = false;\n          const chunk1 = chunk;\n          const chunk2 = chunk;\n\n          // There is no way to access the cloning code right now in the reference implementation.\n          // If we add one then we'll need an implementation for serializable objects.\n          // if (!canceled2 && cloneForBranch2) {\n          //   chunk2 = StructuredDeserialize(StructuredSerialize(chunk2));\n          // }\n\n          if (!canceled1) {\n            ReadableStreamDefaultControllerEnqueue(\n              branch1._readableStreamController as ReadableStreamDefaultController<R>,\n              chunk1\n            );\n          }\n          if (!canceled2) {\n            ReadableStreamDefaultControllerEnqueue(\n              branch2._readableStreamController as ReadableStreamDefaultController<R>,\n              chunk2\n            );\n          }\n\n          reading = false;\n          if (readAgain) {\n            pullAlgorithm();\n          }\n        });\n      },\n      _closeSteps: () => {\n        reading = false;\n        if (!canceled1) {\n          ReadableStreamDefaultControllerClose(branch1._readableStreamController as ReadableStreamDefaultController<R>);\n        }\n        if (!canceled2) {\n          ReadableStreamDefaultControllerClose(branch2._readableStreamController as ReadableStreamDefaultController<R>);\n        }\n\n        if (!canceled1 || !canceled2) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function cancel1Algorithm(reason: any): Promise<void> {\n    canceled1 = true;\n    reason1 = reason;\n    if (canceled2) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function cancel2Algorithm(reason: any): Promise<void> {\n    canceled2 = true;\n    reason2 = reason;\n    if (canceled1) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function startAlgorithm() {\n    // do nothing\n  }\n\n  branch1 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel1Algorithm);\n  branch2 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel2Algorithm);\n\n  uponRejection(reader._closedPromise, (r: any) => {\n    ReadableStreamDefaultControllerError(branch1._readableStreamController as ReadableStreamDefaultController<R>, r);\n    ReadableStreamDefaultControllerError(branch2._readableStreamController as ReadableStreamDefaultController<R>, r);\n    if (!canceled1 || !canceled2) {\n      resolveCancelPromise(undefined);\n    }\n  });\n\n  return [branch1, branch2];\n}\n\nexport function ReadableByteStreamTee(stream: ReadableByteStream): [ReadableByteStream, ReadableByteStream] {\n  assert(IsReadableStream(stream));\n  assert(IsReadableByteStreamController(stream._readableStreamController));\n\n  let reader: ReadableStreamReader<Uint8Array> = AcquireReadableStreamDefaultReader(stream);\n  let reading = false;\n  let readAgainForBranch1 = false;\n  let readAgainForBranch2 = false;\n  let canceled1 = false;\n  let canceled2 = false;\n  let reason1: any;\n  let reason2: any;\n  let branch1: ReadableByteStream;\n  let branch2: ReadableByteStream;\n\n  let resolveCancelPromise: (value: undefined | Promise<undefined>) => void;\n  const cancelPromise = newPromise<void>(resolve => {\n    resolveCancelPromise = resolve;\n  });\n\n  function forwardReaderError(thisReader: ReadableStreamReader<Uint8Array>) {\n    uponRejection(thisReader._closedPromise, r => {\n      if (thisReader !== reader) {\n        return;\n      }\n      ReadableByteStreamControllerError(branch1._readableStreamController, r);\n      ReadableByteStreamControllerError(branch2._readableStreamController, r);\n      if (!canceled1 || !canceled2) {\n        resolveCancelPromise(undefined);\n      }\n    });\n  }\n\n  function pullWithDefaultReader() {\n    if (IsReadableStreamBYOBReader(reader)) {\n      assert(reader._readIntoRequests.length === 0);\n      ReadableStreamReaderGenericRelease(reader);\n\n      reader = AcquireReadableStreamDefaultReader(stream);\n      forwardReaderError(reader);\n    }\n\n    const readRequest: ReadRequest<Uint8Array> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgainForBranch1 = false;\n          readAgainForBranch2 = false;\n\n          const chunk1 = chunk;\n          let chunk2 = chunk;\n          if (!canceled1 && !canceled2) {\n            try {\n              chunk2 = CloneAsUint8Array(chunk);\n            } catch (cloneE) {\n              ReadableByteStreamControllerError(branch1._readableStreamController, cloneE);\n              ReadableByteStreamControllerError(branch2._readableStreamController, cloneE);\n              resolveCancelPromise(ReadableStreamCancel(stream, cloneE));\n              return;\n            }\n          }\n\n          if (!canceled1) {\n            ReadableByteStreamControllerEnqueue(branch1._readableStreamController, chunk1);\n          }\n          if (!canceled2) {\n            ReadableByteStreamControllerEnqueue(branch2._readableStreamController, chunk2);\n          }\n\n          reading = false;\n          if (readAgainForBranch1) {\n            pull1Algorithm();\n          } else if (readAgainForBranch2) {\n            pull2Algorithm();\n          }\n        });\n      },\n      _closeSteps: () => {\n        reading = false;\n        if (!canceled1) {\n          ReadableByteStreamControllerClose(branch1._readableStreamController);\n        }\n        if (!canceled2) {\n          ReadableByteStreamControllerClose(branch2._readableStreamController);\n        }\n        if (branch1._readableStreamController._pendingPullIntos.length > 0) {\n          ReadableByteStreamControllerRespond(branch1._readableStreamController, 0);\n        }\n        if (branch2._readableStreamController._pendingPullIntos.length > 0) {\n          ReadableByteStreamControllerRespond(branch2._readableStreamController, 0);\n        }\n        if (!canceled1 || !canceled2) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n  }\n\n  function pullWithBYOBReader(view: ArrayBufferView, forBranch2: boolean) {\n    if (IsReadableStreamDefaultReader<Uint8Array>(reader)) {\n      assert(reader._readRequests.length === 0);\n      ReadableStreamReaderGenericRelease(reader);\n\n      reader = AcquireReadableStreamBYOBReader(stream);\n      forwardReaderError(reader);\n    }\n\n    const byobBranch = forBranch2 ? branch2 : branch1;\n    const otherBranch = forBranch2 ? branch1 : branch2;\n\n    const readIntoRequest: ReadIntoRequest<ArrayBufferView> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgainForBranch1 = false;\n          readAgainForBranch2 = false;\n\n          const byobCanceled = forBranch2 ? canceled2 : canceled1;\n          const otherCanceled = forBranch2 ? canceled1 : canceled2;\n\n          if (!otherCanceled) {\n            let clonedChunk;\n            try {\n              clonedChunk = CloneAsUint8Array(chunk);\n            } catch (cloneE) {\n              ReadableByteStreamControllerError(byobBranch._readableStreamController, cloneE);\n              ReadableByteStreamControllerError(otherBranch._readableStreamController, cloneE);\n              resolveCancelPromise(ReadableStreamCancel(stream, cloneE));\n              return;\n            }\n            if (!byobCanceled) {\n              ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n            }\n            ReadableByteStreamControllerEnqueue(otherBranch._readableStreamController, clonedChunk);\n          } else if (!byobCanceled) {\n            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n          }\n\n          reading = false;\n          if (readAgainForBranch1) {\n            pull1Algorithm();\n          } else if (readAgainForBranch2) {\n            pull2Algorithm();\n          }\n        });\n      },\n      _closeSteps: chunk => {\n        reading = false;\n\n        const byobCanceled = forBranch2 ? canceled2 : canceled1;\n        const otherCanceled = forBranch2 ? canceled1 : canceled2;\n\n        if (!byobCanceled) {\n          ReadableByteStreamControllerClose(byobBranch._readableStreamController);\n        }\n        if (!otherCanceled) {\n          ReadableByteStreamControllerClose(otherBranch._readableStreamController);\n        }\n\n        if (chunk !== undefined) {\n          assert(chunk.byteLength === 0);\n\n          if (!byobCanceled) {\n            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n          }\n          if (!otherCanceled && otherBranch._readableStreamController._pendingPullIntos.length > 0) {\n            ReadableByteStreamControllerRespond(otherBranch._readableStreamController, 0);\n          }\n        }\n\n        if (!byobCanceled || !otherCanceled) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamBYOBReaderRead(reader, view, readIntoRequest);\n  }\n\n  function pull1Algorithm(): Promise<void> {\n    if (reading) {\n      readAgainForBranch1 = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch1._readableStreamController);\n    if (byobRequest === null) {\n      pullWithDefaultReader();\n    } else {\n      pullWithBYOBReader(byobRequest._view!, false);\n    }\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function pull2Algorithm(): Promise<void> {\n    if (reading) {\n      readAgainForBranch2 = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch2._readableStreamController);\n    if (byobRequest === null) {\n      pullWithDefaultReader();\n    } else {\n      pullWithBYOBReader(byobRequest._view!, true);\n    }\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function cancel1Algorithm(reason: any): Promise<void> {\n    canceled1 = true;\n    reason1 = reason;\n    if (canceled2) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function cancel2Algorithm(reason: any): Promise<void> {\n    canceled2 = true;\n    reason2 = reason;\n    if (canceled1) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function startAlgorithm(): void {\n    return;\n  }\n\n  branch1 = CreateReadableByteStream(startAlgorithm, pull1Algorithm, cancel1Algorithm);\n  branch2 = CreateReadableByteStream(startAlgorithm, pull2Algorithm, cancel2Algorithm);\n\n  forwardReaderError(reader);\n\n  return [branch1, branch2];\n}\n","import { assertDictionary, assertFunction, convertUnsignedLongLongWithEnforceRange } from './basic';\nimport {\n  ReadableStreamController,\n  UnderlyingByteSource,\n  UnderlyingDefaultOrByteSource,\n  UnderlyingDefaultOrByteSourcePullCallback,\n  UnderlyingDefaultOrByteSourceStartCallback,\n  UnderlyingSource,\n  UnderlyingSourceCancelCallback,\n  ValidatedUnderlyingDefaultOrByteSource\n} from '../readable-stream/underlying-source';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\n\nexport function convertUnderlyingDefaultOrByteSource<R>(\n  source: UnderlyingSource<R> | UnderlyingByteSource | null,\n  context: string\n): ValidatedUnderlyingDefaultOrByteSource<R> {\n  assertDictionary(source, context);\n  const original = source as (UnderlyingDefaultOrByteSource<R> | null);\n  const autoAllocateChunkSize = original?.autoAllocateChunkSize;\n  const cancel = original?.cancel;\n  const pull = original?.pull;\n  const start = original?.start;\n  const type = original?.type;\n  return {\n    autoAllocateChunkSize: autoAllocateChunkSize === undefined ?\n      undefined :\n      convertUnsignedLongLongWithEnforceRange(\n        autoAllocateChunkSize,\n        `${context} has member 'autoAllocateChunkSize' that`\n      ),\n    cancel: cancel === undefined ?\n      undefined :\n      convertUnderlyingSourceCancelCallback(cancel, original!, `${context} has member 'cancel' that`),\n    pull: pull === undefined ?\n      undefined :\n      convertUnderlyingSourcePullCallback(pull, original!, `${context} has member 'pull' that`),\n    start: start === undefined ?\n      undefined :\n      convertUnderlyingSourceStartCallback(start, original!, `${context} has member 'start' that`),\n    type: type === undefined ? undefined : convertReadableStreamType(type, `${context} has member 'type' that`)\n  };\n}\n\nfunction convertUnderlyingSourceCancelCallback(\n  fn: UnderlyingSourceCancelCallback,\n  original: UnderlyingDefaultOrByteSource,\n  context: string\n): (reason: any) => Promise<void> {\n  assertFunction(fn, context);\n  return (reason: any) => promiseCall(fn, original, [reason]);\n}\n\nfunction convertUnderlyingSourcePullCallback<R>(\n  fn: UnderlyingDefaultOrByteSourcePullCallback<R>,\n  original: UnderlyingDefaultOrByteSource<R>,\n  context: string\n): (controller: ReadableStreamController<R>) => Promise<void> {\n  assertFunction(fn, context);\n  return (controller: ReadableStreamController<R>) => promiseCall(fn, original, [controller]);\n}\n\nfunction convertUnderlyingSourceStartCallback<R>(\n  fn: UnderlyingDefaultOrByteSourceStartCallback<R>,\n  original: UnderlyingDefaultOrByteSource<R>,\n  context: string\n): UnderlyingDefaultOrByteSourceStartCallback<R> {\n  assertFunction(fn, context);\n  return (controller: ReadableStreamController<R>) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertReadableStreamType(type: string, context: string): 'bytes' {\n  type = `${type}`;\n  if (type !== 'bytes') {\n    throw new TypeError(`${context} '${type}' is not a valid enumeration value for ReadableStreamType`);\n  }\n  return type;\n}\n","import { assertDictionary } from './basic';\nimport { ReadableStreamGetReaderOptions } from '../readable-stream/reader-options';\n\nexport function convertReaderOptions(options: ReadableStreamGetReaderOptions | null | undefined,\n                                     context: string): ReadableStreamGetReaderOptions {\n  assertDictionary(options, context);\n  const mode = options?.mode;\n  return {\n    mode: mode === undefined ? undefined : convertReadableStreamReaderMode(mode, `${context} has member 'mode' that`)\n  };\n}\n\nfunction convertReadableStreamReaderMode(mode: string, context: string): 'byob' {\n  mode = `${mode}`;\n  if (mode !== 'byob') {\n    throw new TypeError(`${context} '${mode}' is not a valid enumeration value for ReadableStreamReaderMode`);\n  }\n  return mode;\n}\n","import { assertDictionary } from './basic';\nimport {\n  ReadableStreamIteratorOptions,\n  ValidatedReadableStreamIteratorOptions\n} from '../readable-stream/iterator-options';\n\nexport function convertIteratorOptions(options: ReadableStreamIteratorOptions | null | undefined,\n                                       context: string): ValidatedReadableStreamIteratorOptions {\n  assertDictionary(options, context);\n  const preventCancel = options?.preventCancel;\n  return { preventCancel: Boolean(preventCancel) };\n}\n","import { assertDictionary } from './basic';\nimport { StreamPipeOptions, ValidatedStreamPipeOptions } from '../readable-stream/pipe-options';\nimport { AbortSignal, isAbortSignal } from '../abort-signal';\n\nexport function convertPipeOptions(options: StreamPipeOptions | null | undefined,\n                                   context: string): ValidatedStreamPipeOptions {\n  assertDictionary(options, context);\n  const preventAbort = options?.preventAbort;\n  const preventCancel = options?.preventCancel;\n  const preventClose = options?.preventClose;\n  const signal = options?.signal;\n  if (signal !== undefined) {\n    assertAbortSignal(signal, `${context} has member 'signal' that`);\n  }\n  return {\n    preventAbort: Boolean(preventAbort),\n    preventCancel: Boolean(preventCancel),\n    preventClose: Boolean(preventClose),\n    signal\n  };\n}\n\nfunction assertAbortSignal(signal: unknown, context: string): asserts signal is AbortSignal {\n  if (!isAbortSignal(signal)) {\n    throw new TypeError(`${context} is not an AbortSignal.`);\n  }\n}\n","import { assertDictionary, assertRequiredField } from './basic';\nimport { ReadableStream } from '../readable-stream';\nimport { WritableStream } from '../writable-stream';\nimport { assertReadableStream } from './readable-stream';\nimport { assertWritableStream } from './writable-stream';\n\nexport function convertReadableWritablePair<RS extends ReadableStream, WS extends WritableStream>(\n  pair: { readable: RS; writable: WS } | null | undefined,\n  context: string\n): { readable: RS; writable: WS } {\n  assertDictionary(pair, context);\n\n  const readable = pair?.readable;\n  assertRequiredField(readable, 'readable', 'ReadableWritablePair');\n  assertReadableStream(readable, `${context} has member 'readable' that`);\n\n  const writable = pair?.writable;\n  assertRequiredField(writable, 'writable', 'ReadableWritablePair');\n  assertWritableStream(writable, `${context} has member 'writable' that`);\n\n  return { readable, writable };\n}\n","import assert from '../stub/assert';\nimport {\n  promiseRejectedWith,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  transformPromiseWith\n} from './helpers/webidl';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { AcquireReadableStreamAsyncIterator, ReadableStreamAsyncIterator } from './readable-stream/async-iterator';\nimport { defaultReaderClosedPromiseReject, defaultReaderClosedPromiseResolve } from './readable-stream/generic-reader';\nimport {\n  AcquireReadableStreamDefaultReader,\n  IsReadableStreamDefaultReader,\n  ReadableStreamDefaultReader,\n  ReadableStreamDefaultReadResult\n} from './readable-stream/default-reader';\nimport {\n  AcquireReadableStreamBYOBReader,\n  IsReadableStreamBYOBReader,\n  ReadableStreamBYOBReader,\n  ReadableStreamBYOBReadResult\n} from './readable-stream/byob-reader';\nimport { ReadableStreamPipeTo } from './readable-stream/pipe';\nimport { ReadableStreamTee } from './readable-stream/tee';\nimport { IsWritableStream, IsWritableStreamLocked, WritableStream } from './writable-stream';\nimport { SimpleQueue } from './simple-queue';\nimport {\n  ReadableByteStreamController,\n  ReadableStreamBYOBRequest,\n  SetUpReadableByteStreamController,\n  SetUpReadableByteStreamControllerFromUnderlyingSource\n} from './readable-stream/byte-stream-controller';\nimport {\n  ReadableStreamDefaultController,\n  SetUpReadableStreamDefaultController,\n  SetUpReadableStreamDefaultControllerFromUnderlyingSource\n} from './readable-stream/default-controller';\nimport {\n  UnderlyingByteSource,\n  UnderlyingByteSourcePullCallback,\n  UnderlyingByteSourceStartCallback,\n  UnderlyingSource,\n  UnderlyingSourceCancelCallback,\n  UnderlyingSourcePullCallback,\n  UnderlyingSourceStartCallback\n} from './readable-stream/underlying-source';\nimport { noop } from '../utils';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { CreateArrayFromList } from './abstract-ops/ecmascript';\nimport { CancelSteps } from './abstract-ops/internal-methods';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { assertObject, assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport { convertUnderlyingDefaultOrByteSource } from './validators/underlying-source';\nimport { ReadableStreamGetReaderOptions } from './readable-stream/reader-options';\nimport { convertReaderOptions } from './validators/reader-options';\nimport { StreamPipeOptions, ValidatedStreamPipeOptions } from './readable-stream/pipe-options';\nimport { ReadableStreamIteratorOptions } from './readable-stream/iterator-options';\nimport { convertIteratorOptions } from './validators/iterator-options';\nimport { convertPipeOptions } from './validators/pipe-options';\nimport { ReadableWritablePair } from './readable-stream/readable-writable-pair';\nimport { convertReadableWritablePair } from './validators/readable-writable-pair';\n\nexport type ReadableByteStream = ReadableStream<Uint8Array> & {\n  _readableStreamController: ReadableByteStreamController\n};\n\ntype ReadableStreamState = 'readable' | 'closed' | 'errored';\n\n/**\n * A readable stream represents a source of data, from which you can read.\n *\n * @public\n */\nexport class ReadableStream<R = any> {\n  /** @internal */\n  _state!: ReadableStreamState;\n  /** @internal */\n  _reader: ReadableStreamReader<R> | undefined;\n  /** @internal */\n  _storedError: any;\n  /** @internal */\n  _disturbed!: boolean;\n  /** @internal */\n  _readableStreamController!: ReadableStreamDefaultController<R> | ReadableByteStreamController;\n\n  constructor(underlyingSource: UnderlyingByteSource, strategy?: { highWaterMark?: number; size?: undefined });\n  constructor(underlyingSource?: UnderlyingSource<R>, strategy?: QueuingStrategy<R>);\n  constructor(rawUnderlyingSource: UnderlyingSource<R> | UnderlyingByteSource | null | undefined = {},\n              rawStrategy: QueuingStrategy<R> | null | undefined = {}) {\n    if (rawUnderlyingSource === undefined) {\n      rawUnderlyingSource = null;\n    } else {\n      assertObject(rawUnderlyingSource, 'First parameter');\n    }\n\n    const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');\n    const underlyingSource = convertUnderlyingDefaultOrByteSource(rawUnderlyingSource, 'First parameter');\n\n    InitializeReadableStream(this);\n\n    if (underlyingSource.type === 'bytes') {\n      if (strategy.size !== undefined) {\n        throw new RangeError('The strategy for a byte stream cannot have a size function');\n      }\n      const highWaterMark = ExtractHighWaterMark(strategy, 0);\n      SetUpReadableByteStreamControllerFromUnderlyingSource(\n        this as unknown as ReadableByteStream,\n        underlyingSource,\n        highWaterMark\n      );\n    } else {\n      assert(underlyingSource.type === undefined);\n      const sizeAlgorithm = ExtractSizeAlgorithm(strategy);\n      const highWaterMark = ExtractHighWaterMark(strategy, 1);\n      SetUpReadableStreamDefaultControllerFromUnderlyingSource(\n        this,\n        underlyingSource,\n        highWaterMark,\n        sizeAlgorithm\n      );\n    }\n  }\n\n  /**\n   * Whether or not the readable stream is locked to a {@link ReadableStreamDefaultReader | reader}.\n   */\n  get locked(): boolean {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('locked');\n    }\n\n    return IsReadableStreamLocked(this);\n  }\n\n  /**\n   * Cancels the stream, signaling a loss of interest in the stream by a consumer.\n   *\n   * The supplied `reason` argument will be given to the underlying source's {@link UnderlyingSource.cancel | cancel()}\n   * method, which might or might not use it.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('cancel'));\n    }\n\n    if (IsReadableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot cancel a stream that already has a reader'));\n    }\n\n    return ReadableStreamCancel(this, reason);\n  }\n\n  /**\n   * Creates a {@link ReadableStreamBYOBReader} and locks the stream to the new reader.\n   *\n   * This call behaves the same way as the no-argument variant, except that it only works on readable byte streams,\n   * i.e. streams which were constructed specifically with the ability to handle \"bring your own buffer\" reading.\n   * The returned BYOB reader provides the ability to directly read individual chunks from the stream via its\n   * {@link ReadableStreamBYOBReader.read | read()} method, into developer-supplied buffers, allowing more precise\n   * control over allocation.\n   */\n  getReader({ mode }: { mode: 'byob' }): ReadableStreamBYOBReader;\n  /**\n   * Creates a {@link ReadableStreamDefaultReader} and locks the stream to the new reader.\n   * While the stream is locked, no other reader can be acquired until this one is released.\n   *\n   * This functionality is especially useful for creating abstractions that desire the ability to consume a stream\n   * in its entirety. By getting a reader for the stream, you can ensure nobody else can interleave reads with yours\n   * or cancel the stream, which would interfere with your abstraction.\n   */\n  getReader(): ReadableStreamDefaultReader<R>;\n  getReader(\n    rawOptions: ReadableStreamGetReaderOptions | null | undefined = undefined\n  ): ReadableStreamDefaultReader<R> | ReadableStreamBYOBReader {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('getReader');\n    }\n\n    const options = convertReaderOptions(rawOptions, 'First parameter');\n\n    if (options.mode === undefined) {\n      return AcquireReadableStreamDefaultReader(this);\n    }\n\n    assert(options.mode === 'byob');\n    return AcquireReadableStreamBYOBReader(this as unknown as ReadableByteStream);\n  }\n\n  /**\n   * Provides a convenient, chainable way of piping this readable stream through a transform stream\n   * (or any other `{ writable, readable }` pair). It simply {@link ReadableStream.pipeTo | pipes} the stream\n   * into the writable side of the supplied pair, and returns the readable side for further use.\n   *\n   * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.\n   */\n  pipeThrough<RS extends ReadableStream>(\n    transform: { readable: RS; writable: WritableStream<R> },\n    options?: StreamPipeOptions\n  ): RS;\n  pipeThrough<RS extends ReadableStream>(\n    rawTransform: { readable: RS; writable: WritableStream<R> } | null | undefined,\n    rawOptions: StreamPipeOptions | null | undefined = {}\n  ): RS {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('pipeThrough');\n    }\n    assertRequiredArgument(rawTransform, 1, 'pipeThrough');\n\n    const transform = convertReadableWritablePair(rawTransform, 'First parameter');\n    const options = convertPipeOptions(rawOptions, 'Second parameter');\n\n    if (IsReadableStreamLocked(this)) {\n      throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked ReadableStream');\n    }\n    if (IsWritableStreamLocked(transform.writable)) {\n      throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked WritableStream');\n    }\n\n    const promise = ReadableStreamPipeTo(\n      this, transform.writable, options.preventClose, options.preventAbort, options.preventCancel, options.signal\n    );\n\n    setPromiseIsHandledToTrue(promise);\n\n    return transform.readable;\n  }\n\n  /**\n   * Pipes this readable stream to a given writable stream. The way in which the piping process behaves under\n   * various error conditions can be customized with a number of passed options. It returns a promise that fulfills\n   * when the piping process completes successfully, or rejects if any errors were encountered.\n   *\n   * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.\n   */\n  pipeTo(destination: WritableStream<R>, options?: StreamPipeOptions): Promise<void>;\n  pipeTo(destination: WritableStream<R> | null | undefined,\n         rawOptions: StreamPipeOptions | null | undefined = {}): Promise<void> {\n    if (!IsReadableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('pipeTo'));\n    }\n\n    if (destination === undefined) {\n      return promiseRejectedWith(`Parameter 1 is required in 'pipeTo'.`);\n    }\n    if (!IsWritableStream(destination)) {\n      return promiseRejectedWith(\n        new TypeError(`ReadableStream.prototype.pipeTo's first argument must be a WritableStream`)\n      );\n    }\n\n    let options: ValidatedStreamPipeOptions;\n    try {\n      options = convertPipeOptions(rawOptions, 'Second parameter');\n    } catch (e) {\n      return promiseRejectedWith(e);\n    }\n\n    if (IsReadableStreamLocked(this)) {\n      return promiseRejectedWith(\n        new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream')\n      );\n    }\n    if (IsWritableStreamLocked(destination)) {\n      return promiseRejectedWith(\n        new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream')\n      );\n    }\n\n    return ReadableStreamPipeTo<R>(\n      this, destination, options.preventClose, options.preventAbort, options.preventCancel, options.signal\n    );\n  }\n\n  /**\n   * Tees this readable stream, returning a two-element array containing the two resulting branches as\n   * new {@link ReadableStream} instances.\n   *\n   * Teeing a stream will lock it, preventing any other consumer from acquiring a reader.\n   * To cancel the stream, cancel both of the resulting branches; a composite cancellation reason will then be\n   * propagated to the stream's underlying source.\n   *\n   * Note that the chunks seen in each branch will be the same object. If the chunks are not immutable,\n   * this could allow interference between the two branches.\n   */\n  tee(): [ReadableStream<R>, ReadableStream<R>] {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('tee');\n    }\n\n    const branches = ReadableStreamTee(this, false);\n    return CreateArrayFromList(branches);\n  }\n\n  /**\n   * Asynchronously iterates over the chunks in the stream's internal queue.\n   *\n   * Asynchronously iterating over the stream will lock it, preventing any other consumer from acquiring a reader.\n   * The lock will be released if the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method\n   * is called, e.g. by breaking out of the loop.\n   *\n   * By default, calling the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method will also\n   * cancel the stream. To prevent this, use the stream's {@link ReadableStream.values | values()} method, passing\n   * `true` for the `preventCancel` option.\n   */\n  values(options?: ReadableStreamIteratorOptions): ReadableStreamAsyncIterator<R>;\n  values(rawOptions: ReadableStreamIteratorOptions | null | undefined = undefined): ReadableStreamAsyncIterator<R> {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('values');\n    }\n\n    const options = convertIteratorOptions(rawOptions, 'First parameter');\n    return AcquireReadableStreamAsyncIterator<R>(this, options.preventCancel);\n  }\n\n  /**\n   * {@inheritDoc ReadableStream.values}\n   */\n  [Symbol.asyncIterator]: (options?: ReadableStreamIteratorOptions) => ReadableStreamAsyncIterator<R>;\n}\n\nObject.defineProperties(ReadableStream.prototype, {\n  cancel: { enumerable: true },\n  getReader: { enumerable: true },\n  pipeThrough: { enumerable: true },\n  pipeTo: { enumerable: true },\n  tee: { enumerable: true },\n  values: { enumerable: true },\n  locked: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStream.prototype, Symbol.toStringTag, {\n    value: 'ReadableStream',\n    configurable: true\n  });\n}\nif (typeof Symbol.asyncIterator === 'symbol') {\n  Object.defineProperty(ReadableStream.prototype, Symbol.asyncIterator, {\n    value: ReadableStream.prototype.values,\n    writable: true,\n    configurable: true\n  });\n}\n\nexport {\n  ReadableStreamAsyncIterator,\n  ReadableStreamDefaultReadResult,\n  ReadableStreamBYOBReadResult,\n  UnderlyingByteSource,\n  UnderlyingSource,\n  UnderlyingSourceStartCallback,\n  UnderlyingSourcePullCallback,\n  UnderlyingSourceCancelCallback,\n  UnderlyingByteSourceStartCallback,\n  UnderlyingByteSourcePullCallback,\n  StreamPipeOptions,\n  ReadableWritablePair,\n  ReadableStreamIteratorOptions\n};\n\n// Abstract operations for the ReadableStream.\n\n// Throws if and only if startAlgorithm throws.\nexport function CreateReadableStream<R>(startAlgorithm: () => void | PromiseLike<void>,\n                                        pullAlgorithm: () => Promise<void>,\n                                        cancelAlgorithm: (reason: any) => Promise<void>,\n                                        highWaterMark = 1,\n                                        sizeAlgorithm: QueuingStrategySizeCallback<R> = () => 1): ReadableStream<R> {\n  assert(IsNonNegativeNumber(highWaterMark));\n\n  const stream: ReadableStream<R> = Object.create(ReadableStream.prototype);\n  InitializeReadableStream(stream);\n\n  const controller: ReadableStreamDefaultController<R> = Object.create(ReadableStreamDefaultController.prototype);\n  SetUpReadableStreamDefaultController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm\n  );\n\n  return stream;\n}\n\n// Throws if and only if startAlgorithm throws.\nexport function CreateReadableByteStream(\n  startAlgorithm: () => void | PromiseLike<void>,\n  pullAlgorithm: () => Promise<void>,\n  cancelAlgorithm: (reason: any) => Promise<void>\n): ReadableByteStream {\n  const stream: ReadableByteStream = Object.create(ReadableStream.prototype);\n  InitializeReadableStream(stream);\n\n  const controller: ReadableByteStreamController = Object.create(ReadableByteStreamController.prototype);\n  SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, 0, undefined);\n\n  return stream;\n}\n\nfunction InitializeReadableStream(stream: ReadableStream) {\n  stream._state = 'readable';\n  stream._reader = undefined;\n  stream._storedError = undefined;\n  stream._disturbed = false;\n}\n\nexport function IsReadableStream(x: unknown): x is ReadableStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readableStreamController')) {\n    return false;\n  }\n\n  return x instanceof ReadableStream;\n}\n\nexport function IsReadableStreamDisturbed(stream: ReadableStream): boolean {\n  assert(IsReadableStream(stream));\n\n  return stream._disturbed;\n}\n\nexport function IsReadableStreamLocked(stream: ReadableStream): boolean {\n  assert(IsReadableStream(stream));\n\n  if (stream._reader === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamCancel<R>(stream: ReadableStream<R>, reason: any): Promise<undefined> {\n  stream._disturbed = true;\n\n  if (stream._state === 'closed') {\n    return promiseResolvedWith(undefined);\n  }\n  if (stream._state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  ReadableStreamClose(stream);\n\n  const reader = stream._reader;\n  if (reader !== undefined && IsReadableStreamBYOBReader(reader)) {\n    reader._readIntoRequests.forEach(readIntoRequest => {\n      readIntoRequest._closeSteps(undefined);\n    });\n    reader._readIntoRequests = new SimpleQueue();\n  }\n\n  const sourceCancelPromise = stream._readableStreamController[CancelSteps](reason);\n  return transformPromiseWith(sourceCancelPromise, noop);\n}\n\nexport function ReadableStreamClose<R>(stream: ReadableStream<R>): void {\n  assert(stream._state === 'readable');\n\n  stream._state = 'closed';\n\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return;\n  }\n\n  defaultReaderClosedPromiseResolve(reader);\n\n  if (IsReadableStreamDefaultReader<R>(reader)) {\n    reader._readRequests.forEach(readRequest => {\n      readRequest._closeSteps();\n    });\n    reader._readRequests = new SimpleQueue();\n  }\n}\n\nexport function ReadableStreamError<R>(stream: ReadableStream<R>, e: any): void {\n  assert(IsReadableStream(stream));\n  assert(stream._state === 'readable');\n\n  stream._state = 'errored';\n  stream._storedError = e;\n\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return;\n  }\n\n  defaultReaderClosedPromiseReject(reader, e);\n\n  if (IsReadableStreamDefaultReader<R>(reader)) {\n    reader._readRequests.forEach(readRequest => {\n      readRequest._errorSteps(e);\n    });\n\n    reader._readRequests = new SimpleQueue();\n  } else {\n    assert(IsReadableStreamBYOBReader(reader));\n\n    reader._readIntoRequests.forEach(readIntoRequest => {\n      readIntoRequest._errorSteps(e);\n    });\n\n    reader._readIntoRequests = new SimpleQueue();\n  }\n}\n\n// Readers\n\nexport type ReadableStreamReader<R> = ReadableStreamDefaultReader<R> | ReadableStreamBYOBReader;\n\nexport {\n  ReadableStreamDefaultReader,\n  ReadableStreamBYOBReader\n};\n\n// Controllers\n\nexport {\n  ReadableStreamDefaultController,\n  ReadableStreamBYOBRequest,\n  ReadableByteStreamController\n};\n\n// Helper functions for the ReadableStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(`ReadableStream.prototype.${name} can only be used on a ReadableStream`);\n}\n","import { QueuingStrategyInit } from '../queuing-strategy';\nimport { assertDictionary, assertRequiredField, convertUnrestrictedDouble } from './basic';\n\nexport function convertQueuingStrategyInit(init: QueuingStrategyInit | null | undefined,\n                                           context: string): QueuingStrategyInit {\n  assertDictionary(init, context);\n  const highWaterMark = init?.highWaterMark;\n  assertRequiredField(highWaterMark, 'highWaterMark', 'QueuingStrategyInit');\n  return {\n    highWaterMark: convertUnrestrictedDouble(highWaterMark)\n  };\n}\n","import { QueuingStrategy, QueuingStrategyInit } from './queuing-strategy';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategyInit } from './validators/queuing-strategy-init';\n\n// The size function must not have a prototype property nor be a constructor\nconst byteLengthSizeFunction = (chunk: ArrayBufferView): number => {\n  return chunk.byteLength;\n};\ntry {\n  Object.defineProperty(byteLengthSizeFunction, 'name', {\n    value: 'size',\n    configurable: true\n  });\n} catch {\n  // This property is non-configurable in older browsers, so ignore if this throws.\n  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility\n}\n\n/**\n * A queuing strategy that counts the number of bytes in each chunk.\n *\n * @public\n */\nexport default class ByteLengthQueuingStrategy implements QueuingStrategy<ArrayBufferView> {\n  /** @internal */\n  readonly _byteLengthQueuingStrategyHighWaterMark: number;\n\n  constructor(options: QueuingStrategyInit) {\n    assertRequiredArgument(options, 1, 'ByteLengthQueuingStrategy');\n    options = convertQueuingStrategyInit(options, 'First parameter');\n    this._byteLengthQueuingStrategyHighWaterMark = options.highWaterMark;\n  }\n\n  /**\n   * Returns the high water mark provided to the constructor.\n   */\n  get highWaterMark(): number {\n    if (!IsByteLengthQueuingStrategy(this)) {\n      throw byteLengthBrandCheckException('highWaterMark');\n    }\n    return this._byteLengthQueuingStrategyHighWaterMark;\n  }\n\n  /**\n   * Measures the size of `chunk` by returning the value of its `byteLength` property.\n   */\n  get size(): (chunk: ArrayBufferView) => number {\n    if (!IsByteLengthQueuingStrategy(this)) {\n      throw byteLengthBrandCheckException('size');\n    }\n    return byteLengthSizeFunction;\n  }\n}\n\nObject.defineProperties(ByteLengthQueuingStrategy.prototype, {\n  highWaterMark: { enumerable: true },\n  size: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ByteLengthQueuingStrategy.prototype, Symbol.toStringTag, {\n    value: 'ByteLengthQueuingStrategy',\n    configurable: true\n  });\n}\n\n// Helper functions for the ByteLengthQueuingStrategy.\n\nfunction byteLengthBrandCheckException(name: string): TypeError {\n  return new TypeError(`ByteLengthQueuingStrategy.prototype.${name} can only be used on a ByteLengthQueuingStrategy`);\n}\n\nexport function IsByteLengthQueuingStrategy(x: any): x is ByteLengthQueuingStrategy {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_byteLengthQueuingStrategyHighWaterMark')) {\n    return false;\n  }\n\n  return x instanceof ByteLengthQueuingStrategy;\n}\n","import { QueuingStrategy, QueuingStrategyInit } from './queuing-strategy';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategyInit } from './validators/queuing-strategy-init';\n\n// The size function must not have a prototype property nor be a constructor\nconst countSizeFunction = (): 1 => {\n  return 1;\n};\ntry {\n  Object.defineProperty(countSizeFunction, 'name', {\n    value: 'size',\n    configurable: true\n  });\n} catch {\n  // This property is non-configurable in older browsers, so ignore if this throws.\n  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility\n}\n\n/**\n * A queuing strategy that counts the number of chunks.\n *\n * @public\n */\nexport default class CountQueuingStrategy implements QueuingStrategy<any> {\n  /** @internal */\n  readonly _countQueuingStrategyHighWaterMark!: number;\n\n  constructor(options: QueuingStrategyInit) {\n    assertRequiredArgument(options, 1, 'CountQueuingStrategy');\n    options = convertQueuingStrategyInit(options, 'First parameter');\n    this._countQueuingStrategyHighWaterMark = options.highWaterMark;\n  }\n\n  /**\n   * Returns the high water mark provided to the constructor.\n   */\n  get highWaterMark(): number {\n    if (!IsCountQueuingStrategy(this)) {\n      throw countBrandCheckException('highWaterMark');\n    }\n    return this._countQueuingStrategyHighWaterMark;\n  }\n\n  /**\n   * Measures the size of `chunk` by always returning 1.\n   * This ensures that the total queue size is a count of the number of chunks in the queue.\n   */\n  get size(): (chunk: any) => 1 {\n    if (!IsCountQueuingStrategy(this)) {\n      throw countBrandCheckException('size');\n    }\n    return countSizeFunction;\n  }\n}\n\nObject.defineProperties(CountQueuingStrategy.prototype, {\n  highWaterMark: { enumerable: true },\n  size: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(CountQueuingStrategy.prototype, Symbol.toStringTag, {\n    value: 'CountQueuingStrategy',\n    configurable: true\n  });\n}\n\n// Helper functions for the CountQueuingStrategy.\n\nfunction countBrandCheckException(name: string): TypeError {\n  return new TypeError(`CountQueuingStrategy.prototype.${name} can only be used on a CountQueuingStrategy`);\n}\n\nexport function IsCountQueuingStrategy(x: any): x is CountQueuingStrategy {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_countQueuingStrategyHighWaterMark')) {\n    return false;\n  }\n\n  return x instanceof CountQueuingStrategy;\n}\n","import { assertDictionary, assertFunction } from './basic';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\nimport {\n  Transformer,\n  TransformerFlushCallback,\n  TransformerStartCallback,\n  TransformerTransformCallback,\n  ValidatedTransformer\n} from '../transform-stream/transformer';\nimport { TransformStreamDefaultController } from '../transform-stream';\n\nexport function convertTransformer<I, O>(original: Transformer<I, O> | null,\n                                         context: string): ValidatedTransformer<I, O> {\n  assertDictionary(original, context);\n  const flush = original?.flush;\n  const readableType = original?.readableType;\n  const start = original?.start;\n  const transform = original?.transform;\n  const writableType = original?.writableType;\n  return {\n    flush: flush === undefined ?\n      undefined :\n      convertTransformerFlushCallback(flush, original!, `${context} has member 'flush' that`),\n    readableType,\n    start: start === undefined ?\n      undefined :\n      convertTransformerStartCallback(start, original!, `${context} has member 'start' that`),\n    transform: transform === undefined ?\n      undefined :\n      convertTransformerTransformCallback(transform, original!, `${context} has member 'transform' that`),\n    writableType\n  };\n}\n\nfunction convertTransformerFlushCallback<I, O>(\n  fn: TransformerFlushCallback<O>,\n  original: Transformer<I, O>,\n  context: string\n): (controller: TransformStreamDefaultController<O>) => Promise<void> {\n  assertFunction(fn, context);\n  return (controller: TransformStreamDefaultController<O>) => promiseCall(fn, original, [controller]);\n}\n\nfunction convertTransformerStartCallback<I, O>(\n  fn: TransformerStartCallback<O>,\n  original: Transformer<I, O>,\n  context: string\n): TransformerStartCallback<O> {\n  assertFunction(fn, context);\n  return (controller: TransformStreamDefaultController<O>) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertTransformerTransformCallback<I, O>(\n  fn: TransformerTransformCallback<I, O>,\n  original: Transformer<I, O>,\n  context: string\n): (chunk: I, controller: TransformStreamDefaultController<O>) => Promise<void> {\n  assertFunction(fn, context);\n  return (chunk: I, controller: TransformStreamDefaultController<O>) => promiseCall(fn, original, [chunk, controller]);\n}\n","import assert from '../stub/assert';\nimport { newPromise, promiseRejectedWith, promiseResolvedWith, transformPromiseWith } from './helpers/webidl';\nimport { CreateReadableStream, ReadableStream, ReadableStreamDefaultController } from './readable-stream';\nimport {\n  ReadableStreamDefaultControllerCanCloseOrEnqueue,\n  ReadableStreamDefaultControllerClose,\n  ReadableStreamDefaultControllerEnqueue,\n  ReadableStreamDefaultControllerError,\n  ReadableStreamDefaultControllerGetDesiredSize,\n  ReadableStreamDefaultControllerHasBackpressure\n} from './readable-stream/default-controller';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { CreateWritableStream, WritableStream, WritableStreamDefaultControllerErrorIfNeeded } from './writable-stream';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport {\n  Transformer,\n  TransformerFlushCallback,\n  TransformerStartCallback,\n  TransformerTransformCallback,\n  ValidatedTransformer\n} from './transform-stream/transformer';\nimport { convertTransformer } from './validators/transformer';\n\n// Class TransformStream\n\n/**\n * A transform stream consists of a pair of streams: a {@link WritableStream | writable stream},\n * known as its writable side, and a {@link ReadableStream | readable stream}, known as its readable side.\n * In a manner specific to the transform stream in question, writes to the writable side result in new data being\n * made available for reading from the readable side.\n *\n * @public\n */\nexport class TransformStream<I = any, O = any> {\n  /** @internal */\n  _writable!: WritableStream<I>;\n  /** @internal */\n  _readable!: ReadableStream<O>;\n  /** @internal */\n  _backpressure!: boolean;\n  /** @internal */\n  _backpressureChangePromise!: Promise<void>;\n  /** @internal */\n  _backpressureChangePromise_resolve!: () => void;\n  /** @internal */\n  _transformStreamController!: TransformStreamDefaultController<O>;\n\n  constructor(\n    transformer?: Transformer<I, O>,\n    writableStrategy?: QueuingStrategy<I>,\n    readableStrategy?: QueuingStrategy<O>\n  );\n  constructor(rawTransformer: Transformer<I, O> | null | undefined = {},\n              rawWritableStrategy: QueuingStrategy<I> | null | undefined = {},\n              rawReadableStrategy: QueuingStrategy<O> | null | undefined = {}) {\n    if (rawTransformer === undefined) {\n      rawTransformer = null;\n    }\n\n    const writableStrategy = convertQueuingStrategy(rawWritableStrategy, 'Second parameter');\n    const readableStrategy = convertQueuingStrategy(rawReadableStrategy, 'Third parameter');\n\n    const transformer = convertTransformer(rawTransformer, 'First parameter');\n    if (transformer.readableType !== undefined) {\n      throw new RangeError('Invalid readableType specified');\n    }\n    if (transformer.writableType !== undefined) {\n      throw new RangeError('Invalid writableType specified');\n    }\n\n    const readableHighWaterMark = ExtractHighWaterMark(readableStrategy, 0);\n    const readableSizeAlgorithm = ExtractSizeAlgorithm(readableStrategy);\n    const writableHighWaterMark = ExtractHighWaterMark(writableStrategy, 1);\n    const writableSizeAlgorithm = ExtractSizeAlgorithm(writableStrategy);\n\n    let startPromise_resolve!: (value: void | PromiseLike<void>) => void;\n    const startPromise = newPromise<void>(resolve => {\n      startPromise_resolve = resolve;\n    });\n\n    InitializeTransformStream(\n      this, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm\n    );\n    SetUpTransformStreamDefaultControllerFromTransformer(this, transformer);\n\n    if (transformer.start !== undefined) {\n      startPromise_resolve(transformer.start(this._transformStreamController));\n    } else {\n      startPromise_resolve(undefined);\n    }\n  }\n\n  /**\n   * The readable side of the transform stream.\n   */\n  get readable(): ReadableStream<O> {\n    if (!IsTransformStream(this)) {\n      throw streamBrandCheckException('readable');\n    }\n\n    return this._readable;\n  }\n\n  /**\n   * The writable side of the transform stream.\n   */\n  get writable(): WritableStream<I> {\n    if (!IsTransformStream(this)) {\n      throw streamBrandCheckException('writable');\n    }\n\n    return this._writable;\n  }\n}\n\nObject.defineProperties(TransformStream.prototype, {\n  readable: { enumerable: true },\n  writable: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(TransformStream.prototype, Symbol.toStringTag, {\n    value: 'TransformStream',\n    configurable: true\n  });\n}\n\nexport {\n  Transformer,\n  TransformerStartCallback,\n  TransformerFlushCallback,\n  TransformerTransformCallback\n};\n\n// Transform Stream Abstract Operations\n\nexport function CreateTransformStream<I, O>(startAlgorithm: () => void | PromiseLike<void>,\n                                            transformAlgorithm: (chunk: I) => Promise<void>,\n                                            flushAlgorithm: () => Promise<void>,\n                                            writableHighWaterMark = 1,\n                                            writableSizeAlgorithm: QueuingStrategySizeCallback<I> = () => 1,\n                                            readableHighWaterMark = 0,\n                                            readableSizeAlgorithm: QueuingStrategySizeCallback<O> = () => 1) {\n  assert(IsNonNegativeNumber(writableHighWaterMark));\n  assert(IsNonNegativeNumber(readableHighWaterMark));\n\n  const stream: TransformStream<I, O> = Object.create(TransformStream.prototype);\n\n  let startPromise_resolve!: (value: void | PromiseLike<void>) => void;\n  const startPromise = newPromise<void>(resolve => {\n    startPromise_resolve = resolve;\n  });\n\n  InitializeTransformStream(stream, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark,\n                            readableSizeAlgorithm);\n\n  const controller: TransformStreamDefaultController<O> = Object.create(TransformStreamDefaultController.prototype);\n\n  SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);\n\n  const startResult = startAlgorithm();\n  startPromise_resolve(startResult);\n  return stream;\n}\n\nfunction InitializeTransformStream<I, O>(stream: TransformStream<I, O>,\n                                         startPromise: Promise<void>,\n                                         writableHighWaterMark: number,\n                                         writableSizeAlgorithm: QueuingStrategySizeCallback<I>,\n                                         readableHighWaterMark: number,\n                                         readableSizeAlgorithm: QueuingStrategySizeCallback<O>) {\n  function startAlgorithm(): Promise<void> {\n    return startPromise;\n  }\n\n  function writeAlgorithm(chunk: I): Promise<void> {\n    return TransformStreamDefaultSinkWriteAlgorithm(stream, chunk);\n  }\n\n  function abortAlgorithm(reason: any): Promise<void> {\n    return TransformStreamDefaultSinkAbortAlgorithm(stream, reason);\n  }\n\n  function closeAlgorithm(): Promise<void> {\n    return TransformStreamDefaultSinkCloseAlgorithm(stream);\n  }\n\n  stream._writable = CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm,\n                                          writableHighWaterMark, writableSizeAlgorithm);\n\n  function pullAlgorithm(): Promise<void> {\n    return TransformStreamDefaultSourcePullAlgorithm(stream);\n  }\n\n  function cancelAlgorithm(reason: any): Promise<void> {\n    TransformStreamErrorWritableAndUnblockWrite(stream, reason);\n    return promiseResolvedWith(undefined);\n  }\n\n  stream._readable = CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, readableHighWaterMark,\n                                          readableSizeAlgorithm);\n\n  // The [[backpressure]] slot is set to undefined so that it can be initialised by TransformStreamSetBackpressure.\n  stream._backpressure = undefined!;\n  stream._backpressureChangePromise = undefined!;\n  stream._backpressureChangePromise_resolve = undefined!;\n  TransformStreamSetBackpressure(stream, true);\n\n  stream._transformStreamController = undefined!;\n}\n\nfunction IsTransformStream(x: unknown): x is TransformStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_transformStreamController')) {\n    return false;\n  }\n\n  return x instanceof TransformStream;\n}\n\n// This is a no-op if both sides are already errored.\nfunction TransformStreamError(stream: TransformStream, e: any) {\n  ReadableStreamDefaultControllerError(\n    stream._readable._readableStreamController as ReadableStreamDefaultController<any>,\n    e\n  );\n  TransformStreamErrorWritableAndUnblockWrite(stream, e);\n}\n\nfunction TransformStreamErrorWritableAndUnblockWrite(stream: TransformStream, e: any) {\n  TransformStreamDefaultControllerClearAlgorithms(stream._transformStreamController);\n  WritableStreamDefaultControllerErrorIfNeeded(stream._writable._writableStreamController, e);\n  if (stream._backpressure) {\n    // Pretend that pull() was called to permit any pending write() calls to complete. TransformStreamSetBackpressure()\n    // cannot be called from enqueue() or pull() once the ReadableStream is errored, so this will will be the final time\n    // _backpressure is set.\n    TransformStreamSetBackpressure(stream, false);\n  }\n}\n\nfunction TransformStreamSetBackpressure(stream: TransformStream, backpressure: boolean) {\n  // Passes also when called during construction.\n  assert(stream._backpressure !== backpressure);\n\n  if (stream._backpressureChangePromise !== undefined) {\n    stream._backpressureChangePromise_resolve();\n  }\n\n  stream._backpressureChangePromise = newPromise(resolve => {\n    stream._backpressureChangePromise_resolve = resolve;\n  });\n\n  stream._backpressure = backpressure;\n}\n\n// Class TransformStreamDefaultController\n\n/**\n * Allows control of the {@link ReadableStream} and {@link WritableStream} of the associated {@link TransformStream}.\n *\n * @public\n */\nexport class TransformStreamDefaultController<O> {\n  /** @internal */\n  _controlledTransformStream: TransformStream<any, O>;\n  /** @internal */\n  _transformAlgorithm: (chunk: any) => Promise<void>;\n  /** @internal */\n  _flushAlgorithm: () => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the desired size to fill the readable side’s internal queue. It can be negative, if the queue is over-full.\n   */\n  get desiredSize(): number | null {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('desiredSize');\n    }\n\n    const readableController = this._controlledTransformStream._readable._readableStreamController;\n    return ReadableStreamDefaultControllerGetDesiredSize(readableController as ReadableStreamDefaultController<O>);\n  }\n\n  /**\n   * Enqueues the given chunk `chunk` in the readable side of the controlled transform stream.\n   */\n  enqueue(chunk: O): void;\n  enqueue(chunk: O = undefined!): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('enqueue');\n    }\n\n    TransformStreamDefaultControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors both the readable side and the writable side of the controlled transform stream, making all future\n   * interactions with it fail with the given error `e`. Any chunks queued for transformation will be discarded.\n   */\n  error(reason: any = undefined): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n\n    TransformStreamDefaultControllerError(this, reason);\n  }\n\n  /**\n   * Closes the readable side and errors the writable side of the controlled transform stream. This is useful when the\n   * transformer only needs to consume a portion of the chunks written to the writable side.\n   */\n  terminate(): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('terminate');\n    }\n\n    TransformStreamDefaultControllerTerminate(this);\n  }\n}\n\nObject.defineProperties(TransformStreamDefaultController.prototype, {\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  terminate: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(TransformStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'TransformStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Transform Stream Default Controller Abstract Operations\n\nfunction IsTransformStreamDefaultController<O = any>(x: any): x is TransformStreamDefaultController<O> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledTransformStream')) {\n    return false;\n  }\n\n  return x instanceof TransformStreamDefaultController;\n}\n\nfunction SetUpTransformStreamDefaultController<I, O>(stream: TransformStream<I, O>,\n                                                     controller: TransformStreamDefaultController<O>,\n                                                     transformAlgorithm: (chunk: I) => Promise<void>,\n                                                     flushAlgorithm: () => Promise<void>) {\n  assert(IsTransformStream(stream));\n  assert(stream._transformStreamController === undefined);\n\n  controller._controlledTransformStream = stream;\n  stream._transformStreamController = controller;\n\n  controller._transformAlgorithm = transformAlgorithm;\n  controller._flushAlgorithm = flushAlgorithm;\n}\n\nfunction SetUpTransformStreamDefaultControllerFromTransformer<I, O>(stream: TransformStream<I, O>,\n                                                                    transformer: ValidatedTransformer<I, O>) {\n  const controller: TransformStreamDefaultController<O> = Object.create(TransformStreamDefaultController.prototype);\n\n  let transformAlgorithm = (chunk: I): Promise<void> => {\n    try {\n      TransformStreamDefaultControllerEnqueue(controller, chunk as unknown as O);\n      return promiseResolvedWith(undefined);\n    } catch (transformResultE) {\n      return promiseRejectedWith(transformResultE);\n    }\n  };\n\n  let flushAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (transformer.transform !== undefined) {\n    transformAlgorithm = chunk => transformer.transform!(chunk, controller);\n  }\n  if (transformer.flush !== undefined) {\n    flushAlgorithm = () => transformer.flush!(controller);\n  }\n\n  SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);\n}\n\nfunction TransformStreamDefaultControllerClearAlgorithms(controller: TransformStreamDefaultController<any>) {\n  controller._transformAlgorithm = undefined!;\n  controller._flushAlgorithm = undefined!;\n}\n\nfunction TransformStreamDefaultControllerEnqueue<O>(controller: TransformStreamDefaultController<O>, chunk: O) {\n  const stream = controller._controlledTransformStream;\n  const readableController = stream._readable._readableStreamController as ReadableStreamDefaultController<O>;\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(readableController)) {\n    throw new TypeError('Readable side is not in a state that permits enqueue');\n  }\n\n  // We throttle transform invocations based on the backpressure of the ReadableStream, but we still\n  // accept TransformStreamDefaultControllerEnqueue() calls.\n\n  try {\n    ReadableStreamDefaultControllerEnqueue(readableController, chunk);\n  } catch (e) {\n    // This happens when readableStrategy.size() throws.\n    TransformStreamErrorWritableAndUnblockWrite(stream, e);\n\n    throw stream._readable._storedError;\n  }\n\n  const backpressure = ReadableStreamDefaultControllerHasBackpressure(readableController);\n  if (backpressure !== stream._backpressure) {\n    assert(backpressure);\n    TransformStreamSetBackpressure(stream, true);\n  }\n}\n\nfunction TransformStreamDefaultControllerError(controller: TransformStreamDefaultController<any>, e: any) {\n  TransformStreamError(controller._controlledTransformStream, e);\n}\n\nfunction TransformStreamDefaultControllerPerformTransform<I, O>(controller: TransformStreamDefaultController<O>,\n                                                                chunk: I) {\n  const transformPromise = controller._transformAlgorithm(chunk);\n  return transformPromiseWith(transformPromise, undefined, r => {\n    TransformStreamError(controller._controlledTransformStream, r);\n    throw r;\n  });\n}\n\nfunction TransformStreamDefaultControllerTerminate<O>(controller: TransformStreamDefaultController<O>) {\n  const stream = controller._controlledTransformStream;\n  const readableController = stream._readable._readableStreamController as ReadableStreamDefaultController<O>;\n\n  ReadableStreamDefaultControllerClose(readableController);\n\n  const error = new TypeError('TransformStream terminated');\n  TransformStreamErrorWritableAndUnblockWrite(stream, error);\n}\n\n// TransformStreamDefaultSink Algorithms\n\nfunction TransformStreamDefaultSinkWriteAlgorithm<I, O>(stream: TransformStream<I, O>, chunk: I): Promise<void> {\n  assert(stream._writable._state === 'writable');\n\n  const controller = stream._transformStreamController;\n\n  if (stream._backpressure) {\n    const backpressureChangePromise = stream._backpressureChangePromise;\n    assert(backpressureChangePromise !== undefined);\n    return transformPromiseWith(backpressureChangePromise, () => {\n      const writable = stream._writable;\n      const state = writable._state;\n      if (state === 'erroring') {\n        throw writable._storedError;\n      }\n      assert(state === 'writable');\n      return TransformStreamDefaultControllerPerformTransform<I, O>(controller, chunk);\n    });\n  }\n\n  return TransformStreamDefaultControllerPerformTransform<I, O>(controller, chunk);\n}\n\nfunction TransformStreamDefaultSinkAbortAlgorithm(stream: TransformStream, reason: any): Promise<void> {\n  // abort() is not called synchronously, so it is possible for abort() to be called when the stream is already\n  // errored.\n  TransformStreamError(stream, reason);\n  return promiseResolvedWith(undefined);\n}\n\nfunction TransformStreamDefaultSinkCloseAlgorithm<I, O>(stream: TransformStream<I, O>): Promise<void> {\n  // stream._readable cannot change after construction, so caching it across a call to user code is safe.\n  const readable = stream._readable;\n\n  const controller = stream._transformStreamController;\n  const flushPromise = controller._flushAlgorithm();\n  TransformStreamDefaultControllerClearAlgorithms(controller);\n\n  // Return a promise that is fulfilled with undefined on success.\n  return transformPromiseWith(flushPromise, () => {\n    if (readable._state === 'errored') {\n      throw readable._storedError;\n    }\n    ReadableStreamDefaultControllerClose(readable._readableStreamController as ReadableStreamDefaultController<O>);\n  }, r => {\n    TransformStreamError(stream, r);\n    throw readable._storedError;\n  });\n}\n\n// TransformStreamDefaultSource Algorithms\n\nfunction TransformStreamDefaultSourcePullAlgorithm(stream: TransformStream): Promise<void> {\n  // Invariant. Enforced by the promises returned by start() and pull().\n  assert(stream._backpressure);\n\n  assert(stream._backpressureChangePromise !== undefined);\n\n  TransformStreamSetBackpressure(stream, false);\n\n  // Prevent the next pull() call until there is backpressure.\n  return stream._backpressureChangePromise;\n}\n\n// Helper functions for the TransformStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `TransformStreamDefaultController.prototype.${name} can only be used on a TransformStreamDefaultController`);\n}\n\n// Helper functions for the TransformStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `TransformStream.prototype.${name} can only be used on a 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\ No newline at end of file
diff --git a/node_modules/web-streams-polyfill/dist/ponyfill.es6.js b/node_modules/web-streams-polyfill/dist/ponyfill.es6.js
new file mode 100644
index 0000000..338e6fe
--- /dev/null
+++ b/node_modules/web-streams-polyfill/dist/ponyfill.es6.js
@@ -0,0 +1,4224 @@
+/**
+ * web-streams-polyfill v3.2.1
+ */
+(function (global, factory) {
+    typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
+    typeof define === 'function' && define.amd ? define(['exports'], factory) :
+    (global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.WebStreamsPolyfill = {}));
+}(this, (function (exports) { 'use strict';
+
+    /// <reference lib="es2015.symbol" />
+    const SymbolPolyfill = typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol' ?
+        Symbol :
+        description => `Symbol(${description})`;
+
+    /// <reference lib="dom" />
+    function noop() {
+        return undefined;
+    }
+    function getGlobals() {
+        if (typeof self !== 'undefined') {
+            return self;
+        }
+        else if (typeof window !== 'undefined') {
+            return window;
+        }
+        else if (typeof global !== 'undefined') {
+            return global;
+        }
+        return undefined;
+    }
+    const globals = getGlobals();
+
+    function typeIsObject(x) {
+        return (typeof x === 'object' && x !== null) || typeof x === 'function';
+    }
+    const rethrowAssertionErrorRejection = noop;
+
+    const originalPromise = Promise;
+    const originalPromiseThen = Promise.prototype.then;
+    const originalPromiseResolve = Promise.resolve.bind(originalPromise);
+    const originalPromiseReject = Promise.reject.bind(originalPromise);
+    function newPromise(executor) {
+        return new originalPromise(executor);
+    }
+    function promiseResolvedWith(value) {
+        return originalPromiseResolve(value);
+    }
+    function promiseRejectedWith(reason) {
+        return originalPromiseReject(reason);
+    }
+    function PerformPromiseThen(promise, onFulfilled, onRejected) {
+        // There doesn't appear to be any way to correctly emulate the behaviour from JavaScript, so this is just an
+        // approximation.
+        return originalPromiseThen.call(promise, onFulfilled, onRejected);
+    }
+    function uponPromise(promise, onFulfilled, onRejected) {
+        PerformPromiseThen(PerformPromiseThen(promise, onFulfilled, onRejected), undefined, rethrowAssertionErrorRejection);
+    }
+    function uponFulfillment(promise, onFulfilled) {
+        uponPromise(promise, onFulfilled);
+    }
+    function uponRejection(promise, onRejected) {
+        uponPromise(promise, undefined, onRejected);
+    }
+    function transformPromiseWith(promise, fulfillmentHandler, rejectionHandler) {
+        return PerformPromiseThen(promise, fulfillmentHandler, rejectionHandler);
+    }
+    function setPromiseIsHandledToTrue(promise) {
+        PerformPromiseThen(promise, undefined, rethrowAssertionErrorRejection);
+    }
+    const queueMicrotask = (() => {
+        const globalQueueMicrotask = globals && globals.queueMicrotask;
+        if (typeof globalQueueMicrotask === 'function') {
+            return globalQueueMicrotask;
+        }
+        const resolvedPromise = promiseResolvedWith(undefined);
+        return (fn) => PerformPromiseThen(resolvedPromise, fn);
+    })();
+    function reflectCall(F, V, args) {
+        if (typeof F !== 'function') {
+            throw new TypeError('Argument is not a function');
+        }
+        return Function.prototype.apply.call(F, V, args);
+    }
+    function promiseCall(F, V, args) {
+        try {
+            return promiseResolvedWith(reflectCall(F, V, args));
+        }
+        catch (value) {
+            return promiseRejectedWith(value);
+        }
+    }
+
+    // Original from Chromium
+    // https://chromium.googlesource.com/chromium/src/+/0aee4434a4dba42a42abaea9bfbc0cd196a63bc1/third_party/blink/renderer/core/streams/SimpleQueue.js
+    const QUEUE_MAX_ARRAY_SIZE = 16384;
+    /**
+     * Simple queue structure.
+     *
+     * Avoids scalability issues with using a packed array directly by using
+     * multiple arrays in a linked list and keeping the array size bounded.
+     */
+    class SimpleQueue {
+        constructor() {
+            this._cursor = 0;
+            this._size = 0;
+            // _front and _back are always defined.
+            this._front = {
+                _elements: [],
+                _next: undefined
+            };
+            this._back = this._front;
+            // The cursor is used to avoid calling Array.shift().
+            // It contains the index of the front element of the array inside the
+            // front-most node. It is always in the range [0, QUEUE_MAX_ARRAY_SIZE).
+            this._cursor = 0;
+            // When there is only one node, size === elements.length - cursor.
+            this._size = 0;
+        }
+        get length() {
+            return this._size;
+        }
+        // For exception safety, this method is structured in order:
+        // 1. Read state
+        // 2. Calculate required state mutations
+        // 3. Perform state mutations
+        push(element) {
+            const oldBack = this._back;
+            let newBack = oldBack;
+            if (oldBack._elements.length === QUEUE_MAX_ARRAY_SIZE - 1) {
+                newBack = {
+                    _elements: [],
+                    _next: undefined
+                };
+            }
+            // push() is the mutation most likely to throw an exception, so it
+            // goes first.
+            oldBack._elements.push(element);
+            if (newBack !== oldBack) {
+                this._back = newBack;
+                oldBack._next = newBack;
+            }
+            ++this._size;
+        }
+        // Like push(), shift() follows the read -> calculate -> mutate pattern for
+        // exception safety.
+        shift() { // must not be called on an empty queue
+            const oldFront = this._front;
+            let newFront = oldFront;
+            const oldCursor = this._cursor;
+            let newCursor = oldCursor + 1;
+            const elements = oldFront._elements;
+            const element = elements[oldCursor];
+            if (newCursor === QUEUE_MAX_ARRAY_SIZE) {
+                newFront = oldFront._next;
+                newCursor = 0;
+            }
+            // No mutations before this point.
+            --this._size;
+            this._cursor = newCursor;
+            if (oldFront !== newFront) {
+                this._front = newFront;
+            }
+            // Permit shifted element to be garbage collected.
+            elements[oldCursor] = undefined;
+            return element;
+        }
+        // The tricky thing about forEach() is that it can be called
+        // re-entrantly. The queue may be mutated inside the callback. It is easy to
+        // see that push() within the callback has no negative effects since the end
+        // of the queue is checked for on every iteration. If shift() is called
+        // repeatedly within the callback then the next iteration may return an
+        // element that has been removed. In this case the callback will be called
+        // with undefined values until we either "catch up" with elements that still
+        // exist or reach the back of the queue.
+        forEach(callback) {
+            let i = this._cursor;
+            let node = this._front;
+            let elements = node._elements;
+            while (i !== elements.length || node._next !== undefined) {
+                if (i === elements.length) {
+                    node = node._next;
+                    elements = node._elements;
+                    i = 0;
+                    if (elements.length === 0) {
+                        break;
+                    }
+                }
+                callback(elements[i]);
+                ++i;
+            }
+        }
+        // Return the element that would be returned if shift() was called now,
+        // without modifying the queue.
+        peek() { // must not be called on an empty queue
+            const front = this._front;
+            const cursor = this._cursor;
+            return front._elements[cursor];
+        }
+    }
+
+    function ReadableStreamReaderGenericInitialize(reader, stream) {
+        reader._ownerReadableStream = stream;
+        stream._reader = reader;
+        if (stream._state === 'readable') {
+            defaultReaderClosedPromiseInitialize(reader);
+        }
+        else if (stream._state === 'closed') {
+            defaultReaderClosedPromiseInitializeAsResolved(reader);
+        }
+        else {
+            defaultReaderClosedPromiseInitializeAsRejected(reader, stream._storedError);
+        }
+    }
+    // A client of ReadableStreamDefaultReader and ReadableStreamBYOBReader may use these functions directly to bypass state
+    // check.
+    function ReadableStreamReaderGenericCancel(reader, reason) {
+        const stream = reader._ownerReadableStream;
+        return ReadableStreamCancel(stream, reason);
+    }
+    function ReadableStreamReaderGenericRelease(reader) {
+        if (reader._ownerReadableStream._state === 'readable') {
+            defaultReaderClosedPromiseReject(reader, new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));
+        }
+        else {
+            defaultReaderClosedPromiseResetToRejected(reader, new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));
+        }
+        reader._ownerReadableStream._reader = undefined;
+        reader._ownerReadableStream = undefined;
+    }
+    // Helper functions for the readers.
+    function readerLockException(name) {
+        return new TypeError('Cannot ' + name + ' a stream using a released reader');
+    }
+    // Helper functions for the ReadableStreamDefaultReader.
+    function defaultReaderClosedPromiseInitialize(reader) {
+        reader._closedPromise = newPromise((resolve, reject) => {
+            reader._closedPromise_resolve = resolve;
+            reader._closedPromise_reject = reject;
+        });
+    }
+    function defaultReaderClosedPromiseInitializeAsRejected(reader, reason) {
+        defaultReaderClosedPromiseInitialize(reader);
+        defaultReaderClosedPromiseReject(reader, reason);
+    }
+    function defaultReaderClosedPromiseInitializeAsResolved(reader) {
+        defaultReaderClosedPromiseInitialize(reader);
+        defaultReaderClosedPromiseResolve(reader);
+    }
+    function defaultReaderClosedPromiseReject(reader, reason) {
+        if (reader._closedPromise_reject === undefined) {
+            return;
+        }
+        setPromiseIsHandledToTrue(reader._closedPromise);
+        reader._closedPromise_reject(reason);
+        reader._closedPromise_resolve = undefined;
+        reader._closedPromise_reject = undefined;
+    }
+    function defaultReaderClosedPromiseResetToRejected(reader, reason) {
+        defaultReaderClosedPromiseInitializeAsRejected(reader, reason);
+    }
+    function defaultReaderClosedPromiseResolve(reader) {
+        if (reader._closedPromise_resolve === undefined) {
+            return;
+        }
+        reader._closedPromise_resolve(undefined);
+        reader._closedPromise_resolve = undefined;
+        reader._closedPromise_reject = undefined;
+    }
+
+    const AbortSteps = SymbolPolyfill('[[AbortSteps]]');
+    const ErrorSteps = SymbolPolyfill('[[ErrorSteps]]');
+    const CancelSteps = SymbolPolyfill('[[CancelSteps]]');
+    const PullSteps = SymbolPolyfill('[[PullSteps]]');
+
+    /// <reference lib="es2015.core" />
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite#Polyfill
+    const NumberIsFinite = Number.isFinite || function (x) {
+        return typeof x === 'number' && isFinite(x);
+    };
+
+    /// <reference lib="es2015.core" />
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc#Polyfill
+    const MathTrunc = Math.trunc || function (v) {
+        return v < 0 ? Math.ceil(v) : Math.floor(v);
+    };
+
+    // https://heycam.github.io/webidl/#idl-dictionaries
+    function isDictionary(x) {
+        return typeof x === 'object' || typeof x === 'function';
+    }
+    function assertDictionary(obj, context) {
+        if (obj !== undefined && !isDictionary(obj)) {
+            throw new TypeError(`${context} is not an object.`);
+        }
+    }
+    // https://heycam.github.io/webidl/#idl-callback-functions
+    function assertFunction(x, context) {
+        if (typeof x !== 'function') {
+            throw new TypeError(`${context} is not a function.`);
+        }
+    }
+    // https://heycam.github.io/webidl/#idl-object
+    function isObject(x) {
+        return (typeof x === 'object' && x !== null) || typeof x === 'function';
+    }
+    function assertObject(x, context) {
+        if (!isObject(x)) {
+            throw new TypeError(`${context} is not an object.`);
+        }
+    }
+    function assertRequiredArgument(x, position, context) {
+        if (x === undefined) {
+            throw new TypeError(`Parameter ${position} is required in '${context}'.`);
+        }
+    }
+    function assertRequiredField(x, field, context) {
+        if (x === undefined) {
+            throw new TypeError(`${field} is required in '${context}'.`);
+        }
+    }
+    // https://heycam.github.io/webidl/#idl-unrestricted-double
+    function convertUnrestrictedDouble(value) {
+        return Number(value);
+    }
+    function censorNegativeZero(x) {
+        return x === 0 ? 0 : x;
+    }
+    function integerPart(x) {
+        return censorNegativeZero(MathTrunc(x));
+    }
+    // https://heycam.github.io/webidl/#idl-unsigned-long-long
+    function convertUnsignedLongLongWithEnforceRange(value, context) {
+        const lowerBound = 0;
+        const upperBound = Number.MAX_SAFE_INTEGER;
+        let x = Number(value);
+        x = censorNegativeZero(x);
+        if (!NumberIsFinite(x)) {
+            throw new TypeError(`${context} is not a finite number`);
+        }
+        x = integerPart(x);
+        if (x < lowerBound || x > upperBound) {
+            throw new TypeError(`${context} is outside the accepted range of ${lowerBound} to ${upperBound}, inclusive`);
+        }
+        if (!NumberIsFinite(x) || x === 0) {
+            return 0;
+        }
+        // TODO Use BigInt if supported?
+        // let xBigInt = BigInt(integerPart(x));
+        // xBigInt = BigInt.asUintN(64, xBigInt);
+        // return Number(xBigInt);
+        return x;
+    }
+
+    function assertReadableStream(x, context) {
+        if (!IsReadableStream(x)) {
+            throw new TypeError(`${context} is not a ReadableStream.`);
+        }
+    }
+
+    // Abstract operations for the ReadableStream.
+    function AcquireReadableStreamDefaultReader(stream) {
+        return new ReadableStreamDefaultReader(stream);
+    }
+    // ReadableStream API exposed for controllers.
+    function ReadableStreamAddReadRequest(stream, readRequest) {
+        stream._reader._readRequests.push(readRequest);
+    }
+    function ReadableStreamFulfillReadRequest(stream, chunk, done) {
+        const reader = stream._reader;
+        const readRequest = reader._readRequests.shift();
+        if (done) {
+            readRequest._closeSteps();
+        }
+        else {
+            readRequest._chunkSteps(chunk);
+        }
+    }
+    function ReadableStreamGetNumReadRequests(stream) {
+        return stream._reader._readRequests.length;
+    }
+    function ReadableStreamHasDefaultReader(stream) {
+        const reader = stream._reader;
+        if (reader === undefined) {
+            return false;
+        }
+        if (!IsReadableStreamDefaultReader(reader)) {
+            return false;
+        }
+        return true;
+    }
+    /**
+     * A default reader vended by a {@link ReadableStream}.
+     *
+     * @public
+     */
+    class ReadableStreamDefaultReader {
+        constructor(stream) {
+            assertRequiredArgument(stream, 1, 'ReadableStreamDefaultReader');
+            assertReadableStream(stream, 'First parameter');
+            if (IsReadableStreamLocked(stream)) {
+                throw new TypeError('This stream has already been locked for exclusive reading by another reader');
+            }
+            ReadableStreamReaderGenericInitialize(this, stream);
+            this._readRequests = new SimpleQueue();
+        }
+        /**
+         * Returns a promise that will be fulfilled when the stream becomes closed,
+         * or rejected if the stream ever errors or the reader's lock is released before the stream finishes closing.
+         */
+        get closed() {
+            if (!IsReadableStreamDefaultReader(this)) {
+                return promiseRejectedWith(defaultReaderBrandCheckException('closed'));
+            }
+            return this._closedPromise;
+        }
+        /**
+         * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.
+         */
+        cancel(reason = undefined) {
+            if (!IsReadableStreamDefaultReader(this)) {
+                return promiseRejectedWith(defaultReaderBrandCheckException('cancel'));
+            }
+            if (this._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('cancel'));
+            }
+            return ReadableStreamReaderGenericCancel(this, reason);
+        }
+        /**
+         * Returns a promise that allows access to the next chunk from the stream's internal queue, if available.
+         *
+         * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.
+         */
+        read() {
+            if (!IsReadableStreamDefaultReader(this)) {
+                return promiseRejectedWith(defaultReaderBrandCheckException('read'));
+            }
+            if (this._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('read from'));
+            }
+            let resolvePromise;
+            let rejectPromise;
+            const promise = newPromise((resolve, reject) => {
+                resolvePromise = resolve;
+                rejectPromise = reject;
+            });
+            const readRequest = {
+                _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),
+                _closeSteps: () => resolvePromise({ value: undefined, done: true }),
+                _errorSteps: e => rejectPromise(e)
+            };
+            ReadableStreamDefaultReaderRead(this, readRequest);
+            return promise;
+        }
+        /**
+         * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.
+         * If the associated stream is errored when the lock is released, the reader will appear errored in the same way
+         * from now on; otherwise, the reader will appear closed.
+         *
+         * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by
+         * the reader's {@link ReadableStreamDefaultReader.read | read()} method has not yet been settled. Attempting to
+         * do so will throw a `TypeError` and leave the reader locked to the stream.
+         */
+        releaseLock() {
+            if (!IsReadableStreamDefaultReader(this)) {
+                throw defaultReaderBrandCheckException('releaseLock');
+            }
+            if (this._ownerReadableStream === undefined) {
+                return;
+            }
+            if (this._readRequests.length > 0) {
+                throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');
+            }
+            ReadableStreamReaderGenericRelease(this);
+        }
+    }
+    Object.defineProperties(ReadableStreamDefaultReader.prototype, {
+        cancel: { enumerable: true },
+        read: { enumerable: true },
+        releaseLock: { enumerable: true },
+        closed: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableStreamDefaultReader.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableStreamDefaultReader',
+            configurable: true
+        });
+    }
+    // Abstract operations for the readers.
+    function IsReadableStreamDefaultReader(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_readRequests')) {
+            return false;
+        }
+        return x instanceof ReadableStreamDefaultReader;
+    }
+    function ReadableStreamDefaultReaderRead(reader, readRequest) {
+        const stream = reader._ownerReadableStream;
+        stream._disturbed = true;
+        if (stream._state === 'closed') {
+            readRequest._closeSteps();
+        }
+        else if (stream._state === 'errored') {
+            readRequest._errorSteps(stream._storedError);
+        }
+        else {
+            stream._readableStreamController[PullSteps](readRequest);
+        }
+    }
+    // Helper functions for the ReadableStreamDefaultReader.
+    function defaultReaderBrandCheckException(name) {
+        return new TypeError(`ReadableStreamDefaultReader.prototype.${name} can only be used on a ReadableStreamDefaultReader`);
+    }
+
+    /// <reference lib="es2018.asynciterable" />
+    let AsyncIteratorPrototype;
+    if (typeof SymbolPolyfill.asyncIterator === 'symbol') {
+        // We're running inside a ES2018+ environment, but we're compiling to an older syntax.
+        // We cannot access %AsyncIteratorPrototype% without non-ES2018 syntax, but we can re-create it.
+        AsyncIteratorPrototype = {
+            // 25.1.3.1 %AsyncIteratorPrototype% [ @@asyncIterator ] ( )
+            // https://tc39.github.io/ecma262/#sec-asynciteratorprototype-asynciterator
+            [SymbolPolyfill.asyncIterator]() {
+                return this;
+            }
+        };
+        Object.defineProperty(AsyncIteratorPrototype, SymbolPolyfill.asyncIterator, { enumerable: false });
+    }
+
+    /// <reference lib="es2018.asynciterable" />
+    class ReadableStreamAsyncIteratorImpl {
+        constructor(reader, preventCancel) {
+            this._ongoingPromise = undefined;
+            this._isFinished = false;
+            this._reader = reader;
+            this._preventCancel = preventCancel;
+        }
+        next() {
+            const nextSteps = () => this._nextSteps();
+            this._ongoingPromise = this._ongoingPromise ?
+                transformPromiseWith(this._ongoingPromise, nextSteps, nextSteps) :
+                nextSteps();
+            return this._ongoingPromise;
+        }
+        return(value) {
+            const returnSteps = () => this._returnSteps(value);
+            return this._ongoingPromise ?
+                transformPromiseWith(this._ongoingPromise, returnSteps, returnSteps) :
+                returnSteps();
+        }
+        _nextSteps() {
+            if (this._isFinished) {
+                return Promise.resolve({ value: undefined, done: true });
+            }
+            const reader = this._reader;
+            if (reader._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('iterate'));
+            }
+            let resolvePromise;
+            let rejectPromise;
+            const promise = newPromise((resolve, reject) => {
+                resolvePromise = resolve;
+                rejectPromise = reject;
+            });
+            const readRequest = {
+                _chunkSteps: chunk => {
+                    this._ongoingPromise = undefined;
+                    // This needs to be delayed by one microtask, otherwise we stop pulling too early which breaks a test.
+                    // FIXME Is this a bug in the specification, or in the test?
+                    queueMicrotask(() => resolvePromise({ value: chunk, done: false }));
+                },
+                _closeSteps: () => {
+                    this._ongoingPromise = undefined;
+                    this._isFinished = true;
+                    ReadableStreamReaderGenericRelease(reader);
+                    resolvePromise({ value: undefined, done: true });
+                },
+                _errorSteps: reason => {
+                    this._ongoingPromise = undefined;
+                    this._isFinished = true;
+                    ReadableStreamReaderGenericRelease(reader);
+                    rejectPromise(reason);
+                }
+            };
+            ReadableStreamDefaultReaderRead(reader, readRequest);
+            return promise;
+        }
+        _returnSteps(value) {
+            if (this._isFinished) {
+                return Promise.resolve({ value, done: true });
+            }
+            this._isFinished = true;
+            const reader = this._reader;
+            if (reader._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('finish iterating'));
+            }
+            if (!this._preventCancel) {
+                const result = ReadableStreamReaderGenericCancel(reader, value);
+                ReadableStreamReaderGenericRelease(reader);
+                return transformPromiseWith(result, () => ({ value, done: true }));
+            }
+            ReadableStreamReaderGenericRelease(reader);
+            return promiseResolvedWith({ value, done: true });
+        }
+    }
+    const ReadableStreamAsyncIteratorPrototype = {
+        next() {
+            if (!IsReadableStreamAsyncIterator(this)) {
+                return promiseRejectedWith(streamAsyncIteratorBrandCheckException('next'));
+            }
+            return this._asyncIteratorImpl.next();
+        },
+        return(value) {
+            if (!IsReadableStreamAsyncIterator(this)) {
+                return promiseRejectedWith(streamAsyncIteratorBrandCheckException('return'));
+            }
+            return this._asyncIteratorImpl.return(value);
+        }
+    };
+    if (AsyncIteratorPrototype !== undefined) {
+        Object.setPrototypeOf(ReadableStreamAsyncIteratorPrototype, AsyncIteratorPrototype);
+    }
+    // Abstract operations for the ReadableStream.
+    function AcquireReadableStreamAsyncIterator(stream, preventCancel) {
+        const reader = AcquireReadableStreamDefaultReader(stream);
+        const impl = new ReadableStreamAsyncIteratorImpl(reader, preventCancel);
+        const iterator = Object.create(ReadableStreamAsyncIteratorPrototype);
+        iterator._asyncIteratorImpl = impl;
+        return iterator;
+    }
+    function IsReadableStreamAsyncIterator(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_asyncIteratorImpl')) {
+            return false;
+        }
+        try {
+            // noinspection SuspiciousTypeOfGuard
+            return x._asyncIteratorImpl instanceof
+                ReadableStreamAsyncIteratorImpl;
+        }
+        catch (_a) {
+            return false;
+        }
+    }
+    // Helper functions for the ReadableStream.
+    function streamAsyncIteratorBrandCheckException(name) {
+        return new TypeError(`ReadableStreamAsyncIterator.${name} can only be used on a ReadableSteamAsyncIterator`);
+    }
+
+    /// <reference lib="es2015.core" />
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Polyfill
+    const NumberIsNaN = Number.isNaN || function (x) {
+        // eslint-disable-next-line no-self-compare
+        return x !== x;
+    };
+
+    function CreateArrayFromList(elements) {
+        // We use arrays to represent lists, so this is basically a no-op.
+        // Do a slice though just in case we happen to depend on the unique-ness.
+        return elements.slice();
+    }
+    function CopyDataBlockBytes(dest, destOffset, src, srcOffset, n) {
+        new Uint8Array(dest).set(new Uint8Array(src, srcOffset, n), destOffset);
+    }
+    // Not implemented correctly
+    function TransferArrayBuffer(O) {
+        return O;
+    }
+    // Not implemented correctly
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    function IsDetachedBuffer(O) {
+        return false;
+    }
+    function ArrayBufferSlice(buffer, begin, end) {
+        // ArrayBuffer.prototype.slice is not available on IE10
+        // https://www.caniuse.com/mdn-javascript_builtins_arraybuffer_slice
+        if (buffer.slice) {
+            return buffer.slice(begin, end);
+        }
+        const length = end - begin;
+        const slice = new ArrayBuffer(length);
+        CopyDataBlockBytes(slice, 0, buffer, begin, length);
+        return slice;
+    }
+
+    function IsNonNegativeNumber(v) {
+        if (typeof v !== 'number') {
+            return false;
+        }
+        if (NumberIsNaN(v)) {
+            return false;
+        }
+        if (v < 0) {
+            return false;
+        }
+        return true;
+    }
+    function CloneAsUint8Array(O) {
+        const buffer = ArrayBufferSlice(O.buffer, O.byteOffset, O.byteOffset + O.byteLength);
+        return new Uint8Array(buffer);
+    }
+
+    function DequeueValue(container) {
+        const pair = container._queue.shift();
+        container._queueTotalSize -= pair.size;
+        if (container._queueTotalSize < 0) {
+            container._queueTotalSize = 0;
+        }
+        return pair.value;
+    }
+    function EnqueueValueWithSize(container, value, size) {
+        if (!IsNonNegativeNumber(size) || size === Infinity) {
+            throw new RangeError('Size must be a finite, non-NaN, non-negative number.');
+        }
+        container._queue.push({ value, size });
+        container._queueTotalSize += size;
+    }
+    function PeekQueueValue(container) {
+        const pair = container._queue.peek();
+        return pair.value;
+    }
+    function ResetQueue(container) {
+        container._queue = new SimpleQueue();
+        container._queueTotalSize = 0;
+    }
+
+    /**
+     * A pull-into request in a {@link ReadableByteStreamController}.
+     *
+     * @public
+     */
+    class ReadableStreamBYOBRequest {
+        constructor() {
+            throw new TypeError('Illegal constructor');
+        }
+        /**
+         * Returns the view for writing in to, or `null` if the BYOB request has already been responded to.
+         */
+        get view() {
+            if (!IsReadableStreamBYOBRequest(this)) {
+                throw byobRequestBrandCheckException('view');
+            }
+            return this._view;
+        }
+        respond(bytesWritten) {
+            if (!IsReadableStreamBYOBRequest(this)) {
+                throw byobRequestBrandCheckException('respond');
+            }
+            assertRequiredArgument(bytesWritten, 1, 'respond');
+            bytesWritten = convertUnsignedLongLongWithEnforceRange(bytesWritten, 'First parameter');
+            if (this._associatedReadableByteStreamController === undefined) {
+                throw new TypeError('This BYOB request has been invalidated');
+            }
+            if (IsDetachedBuffer(this._view.buffer)) ;
+            ReadableByteStreamControllerRespond(this._associatedReadableByteStreamController, bytesWritten);
+        }
+        respondWithNewView(view) {
+            if (!IsReadableStreamBYOBRequest(this)) {
+                throw byobRequestBrandCheckException('respondWithNewView');
+            }
+            assertRequiredArgument(view, 1, 'respondWithNewView');
+            if (!ArrayBuffer.isView(view)) {
+                throw new TypeError('You can only respond with array buffer views');
+            }
+            if (this._associatedReadableByteStreamController === undefined) {
+                throw new TypeError('This BYOB request has been invalidated');
+            }
+            if (IsDetachedBuffer(view.buffer)) ;
+            ReadableByteStreamControllerRespondWithNewView(this._associatedReadableByteStreamController, view);
+        }
+    }
+    Object.defineProperties(ReadableStreamBYOBRequest.prototype, {
+        respond: { enumerable: true },
+        respondWithNewView: { enumerable: true },
+        view: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableStreamBYOBRequest.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableStreamBYOBRequest',
+            configurable: true
+        });
+    }
+    /**
+     * Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue.
+     *
+     * @public
+     */
+    class ReadableByteStreamController {
+        constructor() {
+            throw new TypeError('Illegal constructor');
+        }
+        /**
+         * Returns the current BYOB pull request, or `null` if there isn't one.
+         */
+        get byobRequest() {
+            if (!IsReadableByteStreamController(this)) {
+                throw byteStreamControllerBrandCheckException('byobRequest');
+            }
+            return ReadableByteStreamControllerGetBYOBRequest(this);
+        }
+        /**
+         * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is
+         * over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure.
+         */
+        get desiredSize() {
+            if (!IsReadableByteStreamController(this)) {
+                throw byteStreamControllerBrandCheckException('desiredSize');
+            }
+            return ReadableByteStreamControllerGetDesiredSize(this);
+        }
+        /**
+         * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from
+         * the stream, but once those are read, the stream will become closed.
+         */
+        close() {
+            if (!IsReadableByteStreamController(this)) {
+                throw byteStreamControllerBrandCheckException('close');
+            }
+            if (this._closeRequested) {
+                throw new TypeError('The stream has already been closed; do not close it again!');
+            }
+            const state = this._controlledReadableByteStream._state;
+            if (state !== 'readable') {
+                throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be closed`);
+            }
+            ReadableByteStreamControllerClose(this);
+        }
+        enqueue(chunk) {
+            if (!IsReadableByteStreamController(this)) {
+                throw byteStreamControllerBrandCheckException('enqueue');
+            }
+            assertRequiredArgument(chunk, 1, 'enqueue');
+            if (!ArrayBuffer.isView(chunk)) {
+                throw new TypeError('chunk must be an array buffer view');
+            }
+            if (chunk.byteLength === 0) {
+                throw new TypeError('chunk must have non-zero byteLength');
+            }
+            if (chunk.buffer.byteLength === 0) {
+                throw new TypeError(`chunk's buffer must have non-zero byteLength`);
+            }
+            if (this._closeRequested) {
+                throw new TypeError('stream is closed or draining');
+            }
+            const state = this._controlledReadableByteStream._state;
+            if (state !== 'readable') {
+                throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be enqueued to`);
+            }
+            ReadableByteStreamControllerEnqueue(this, chunk);
+        }
+        /**
+         * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.
+         */
+        error(e = undefined) {
+            if (!IsReadableByteStreamController(this)) {
+                throw byteStreamControllerBrandCheckException('error');
+            }
+            ReadableByteStreamControllerError(this, e);
+        }
+        /** @internal */
+        [CancelSteps](reason) {
+            ReadableByteStreamControllerClearPendingPullIntos(this);
+            ResetQueue(this);
+            const result = this._cancelAlgorithm(reason);
+            ReadableByteStreamControllerClearAlgorithms(this);
+            return result;
+        }
+        /** @internal */
+        [PullSteps](readRequest) {
+            const stream = this._controlledReadableByteStream;
+            if (this._queueTotalSize > 0) {
+                const entry = this._queue.shift();
+                this._queueTotalSize -= entry.byteLength;
+                ReadableByteStreamControllerHandleQueueDrain(this);
+                const view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);
+                readRequest._chunkSteps(view);
+                return;
+            }
+            const autoAllocateChunkSize = this._autoAllocateChunkSize;
+            if (autoAllocateChunkSize !== undefined) {
+                let buffer;
+                try {
+                    buffer = new ArrayBuffer(autoAllocateChunkSize);
+                }
+                catch (bufferE) {
+                    readRequest._errorSteps(bufferE);
+                    return;
+                }
+                const pullIntoDescriptor = {
+                    buffer,
+                    bufferByteLength: autoAllocateChunkSize,
+                    byteOffset: 0,
+                    byteLength: autoAllocateChunkSize,
+                    bytesFilled: 0,
+                    elementSize: 1,
+                    viewConstructor: Uint8Array,
+                    readerType: 'default'
+                };
+                this._pendingPullIntos.push(pullIntoDescriptor);
+            }
+            ReadableStreamAddReadRequest(stream, readRequest);
+            ReadableByteStreamControllerCallPullIfNeeded(this);
+        }
+    }
+    Object.defineProperties(ReadableByteStreamController.prototype, {
+        close: { enumerable: true },
+        enqueue: { enumerable: true },
+        error: { enumerable: true },
+        byobRequest: { enumerable: true },
+        desiredSize: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableByteStreamController.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableByteStreamController',
+            configurable: true
+        });
+    }
+    // Abstract operations for the ReadableByteStreamController.
+    function IsReadableByteStreamController(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableByteStream')) {
+            return false;
+        }
+        return x instanceof ReadableByteStreamController;
+    }
+    function IsReadableStreamBYOBRequest(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_associatedReadableByteStreamController')) {
+            return false;
+        }
+        return x instanceof ReadableStreamBYOBRequest;
+    }
+    function ReadableByteStreamControllerCallPullIfNeeded(controller) {
+        const shouldPull = ReadableByteStreamControllerShouldCallPull(controller);
+        if (!shouldPull) {
+            return;
+        }
+        if (controller._pulling) {
+            controller._pullAgain = true;
+            return;
+        }
+        controller._pulling = true;
+        // TODO: Test controller argument
+        const pullPromise = controller._pullAlgorithm();
+        uponPromise(pullPromise, () => {
+            controller._pulling = false;
+            if (controller._pullAgain) {
+                controller._pullAgain = false;
+                ReadableByteStreamControllerCallPullIfNeeded(controller);
+            }
+        }, e => {
+            ReadableByteStreamControllerError(controller, e);
+        });
+    }
+    function ReadableByteStreamControllerClearPendingPullIntos(controller) {
+        ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+        controller._pendingPullIntos = new SimpleQueue();
+    }
+    function ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor) {
+        let done = false;
+        if (stream._state === 'closed') {
+            done = true;
+        }
+        const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor);
+        if (pullIntoDescriptor.readerType === 'default') {
+            ReadableStreamFulfillReadRequest(stream, filledView, done);
+        }
+        else {
+            ReadableStreamFulfillReadIntoRequest(stream, filledView, done);
+        }
+    }
+    function ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor) {
+        const bytesFilled = pullIntoDescriptor.bytesFilled;
+        const elementSize = pullIntoDescriptor.elementSize;
+        return new pullIntoDescriptor.viewConstructor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize);
+    }
+    function ReadableByteStreamControllerEnqueueChunkToQueue(controller, buffer, byteOffset, byteLength) {
+        controller._queue.push({ buffer, byteOffset, byteLength });
+        controller._queueTotalSize += byteLength;
+    }
+    function ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor) {
+        const elementSize = pullIntoDescriptor.elementSize;
+        const currentAlignedBytes = pullIntoDescriptor.bytesFilled - pullIntoDescriptor.bytesFilled % elementSize;
+        const maxBytesToCopy = Math.min(controller._queueTotalSize, pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled);
+        const maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;
+        const maxAlignedBytes = maxBytesFilled - maxBytesFilled % elementSize;
+        let totalBytesToCopyRemaining = maxBytesToCopy;
+        let ready = false;
+        if (maxAlignedBytes > currentAlignedBytes) {
+            totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled;
+            ready = true;
+        }
+        const queue = controller._queue;
+        while (totalBytesToCopyRemaining > 0) {
+            const headOfQueue = queue.peek();
+            const bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength);
+            const destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;
+            CopyDataBlockBytes(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy);
+            if (headOfQueue.byteLength === bytesToCopy) {
+                queue.shift();
+            }
+            else {
+                headOfQueue.byteOffset += bytesToCopy;
+                headOfQueue.byteLength -= bytesToCopy;
+            }
+            controller._queueTotalSize -= bytesToCopy;
+            ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor);
+            totalBytesToCopyRemaining -= bytesToCopy;
+        }
+        return ready;
+    }
+    function ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, size, pullIntoDescriptor) {
+        pullIntoDescriptor.bytesFilled += size;
+    }
+    function ReadableByteStreamControllerHandleQueueDrain(controller) {
+        if (controller._queueTotalSize === 0 && controller._closeRequested) {
+            ReadableByteStreamControllerClearAlgorithms(controller);
+            ReadableStreamClose(controller._controlledReadableByteStream);
+        }
+        else {
+            ReadableByteStreamControllerCallPullIfNeeded(controller);
+        }
+    }
+    function ReadableByteStreamControllerInvalidateBYOBRequest(controller) {
+        if (controller._byobRequest === null) {
+            return;
+        }
+        controller._byobRequest._associatedReadableByteStreamController = undefined;
+        controller._byobRequest._view = null;
+        controller._byobRequest = null;
+    }
+    function ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller) {
+        while (controller._pendingPullIntos.length > 0) {
+            if (controller._queueTotalSize === 0) {
+                return;
+            }
+            const pullIntoDescriptor = controller._pendingPullIntos.peek();
+            if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {
+                ReadableByteStreamControllerShiftPendingPullInto(controller);
+                ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);
+            }
+        }
+    }
+    function ReadableByteStreamControllerPullInto(controller, view, readIntoRequest) {
+        const stream = controller._controlledReadableByteStream;
+        let elementSize = 1;
+        if (view.constructor !== DataView) {
+            elementSize = view.constructor.BYTES_PER_ELEMENT;
+        }
+        const ctor = view.constructor;
+        // try {
+        const buffer = TransferArrayBuffer(view.buffer);
+        // } catch (e) {
+        //   readIntoRequest._errorSteps(e);
+        //   return;
+        // }
+        const pullIntoDescriptor = {
+            buffer,
+            bufferByteLength: buffer.byteLength,
+            byteOffset: view.byteOffset,
+            byteLength: view.byteLength,
+            bytesFilled: 0,
+            elementSize,
+            viewConstructor: ctor,
+            readerType: 'byob'
+        };
+        if (controller._pendingPullIntos.length > 0) {
+            controller._pendingPullIntos.push(pullIntoDescriptor);
+            // No ReadableByteStreamControllerCallPullIfNeeded() call since:
+            // - No change happens on desiredSize
+            // - The source has already been notified of that there's at least 1 pending read(view)
+            ReadableStreamAddReadIntoRequest(stream, readIntoRequest);
+            return;
+        }
+        if (stream._state === 'closed') {
+            const emptyView = new ctor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0);
+            readIntoRequest._closeSteps(emptyView);
+            return;
+        }
+        if (controller._queueTotalSize > 0) {
+            if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {
+                const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor);
+                ReadableByteStreamControllerHandleQueueDrain(controller);
+                readIntoRequest._chunkSteps(filledView);
+                return;
+            }
+            if (controller._closeRequested) {
+                const e = new TypeError('Insufficient bytes to fill elements in the given buffer');
+                ReadableByteStreamControllerError(controller, e);
+                readIntoRequest._errorSteps(e);
+                return;
+            }
+        }
+        controller._pendingPullIntos.push(pullIntoDescriptor);
+        ReadableStreamAddReadIntoRequest(stream, readIntoRequest);
+        ReadableByteStreamControllerCallPullIfNeeded(controller);
+    }
+    function ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor) {
+        const stream = controller._controlledReadableByteStream;
+        if (ReadableStreamHasBYOBReader(stream)) {
+            while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {
+                const pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);
+                ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);
+            }
+        }
+    }
+    function ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, pullIntoDescriptor) {
+        ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor);
+        if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {
+            return;
+        }
+        ReadableByteStreamControllerShiftPendingPullInto(controller);
+        const remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize;
+        if (remainderSize > 0) {
+            const end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;
+            const remainder = ArrayBufferSlice(pullIntoDescriptor.buffer, end - remainderSize, end);
+            ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength);
+        }
+        pullIntoDescriptor.bytesFilled -= remainderSize;
+        ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);
+        ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);
+    }
+    function ReadableByteStreamControllerRespondInternal(controller, bytesWritten) {
+        const firstDescriptor = controller._pendingPullIntos.peek();
+        ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+        const state = controller._controlledReadableByteStream._state;
+        if (state === 'closed') {
+            ReadableByteStreamControllerRespondInClosedState(controller);
+        }
+        else {
+            ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);
+        }
+        ReadableByteStreamControllerCallPullIfNeeded(controller);
+    }
+    function ReadableByteStreamControllerShiftPendingPullInto(controller) {
+        const descriptor = controller._pendingPullIntos.shift();
+        return descriptor;
+    }
+    function ReadableByteStreamControllerShouldCallPull(controller) {
+        const stream = controller._controlledReadableByteStream;
+        if (stream._state !== 'readable') {
+            return false;
+        }
+        if (controller._closeRequested) {
+            return false;
+        }
+        if (!controller._started) {
+            return false;
+        }
+        if (ReadableStreamHasDefaultReader(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+            return true;
+        }
+        if (ReadableStreamHasBYOBReader(stream) && ReadableStreamGetNumReadIntoRequests(stream) > 0) {
+            return true;
+        }
+        const desiredSize = ReadableByteStreamControllerGetDesiredSize(controller);
+        if (desiredSize > 0) {
+            return true;
+        }
+        return false;
+    }
+    function ReadableByteStreamControllerClearAlgorithms(controller) {
+        controller._pullAlgorithm = undefined;
+        controller._cancelAlgorithm = undefined;
+    }
+    // A client of ReadableByteStreamController may use these functions directly to bypass state check.
+    function ReadableByteStreamControllerClose(controller) {
+        const stream = controller._controlledReadableByteStream;
+        if (controller._closeRequested || stream._state !== 'readable') {
+            return;
+        }
+        if (controller._queueTotalSize > 0) {
+            controller._closeRequested = true;
+            return;
+        }
+        if (controller._pendingPullIntos.length > 0) {
+            const firstPendingPullInto = controller._pendingPullIntos.peek();
+            if (firstPendingPullInto.bytesFilled > 0) {
+                const e = new TypeError('Insufficient bytes to fill elements in the given buffer');
+                ReadableByteStreamControllerError(controller, e);
+                throw e;
+            }
+        }
+        ReadableByteStreamControllerClearAlgorithms(controller);
+        ReadableStreamClose(stream);
+    }
+    function ReadableByteStreamControllerEnqueue(controller, chunk) {
+        const stream = controller._controlledReadableByteStream;
+        if (controller._closeRequested || stream._state !== 'readable') {
+            return;
+        }
+        const buffer = chunk.buffer;
+        const byteOffset = chunk.byteOffset;
+        const byteLength = chunk.byteLength;
+        const transferredBuffer = TransferArrayBuffer(buffer);
+        if (controller._pendingPullIntos.length > 0) {
+            const firstPendingPullInto = controller._pendingPullIntos.peek();
+            if (IsDetachedBuffer(firstPendingPullInto.buffer)) ;
+            firstPendingPullInto.buffer = TransferArrayBuffer(firstPendingPullInto.buffer);
+        }
+        ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+        if (ReadableStreamHasDefaultReader(stream)) {
+            if (ReadableStreamGetNumReadRequests(stream) === 0) {
+                ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+            }
+            else {
+                if (controller._pendingPullIntos.length > 0) {
+                    ReadableByteStreamControllerShiftPendingPullInto(controller);
+                }
+                const transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength);
+                ReadableStreamFulfillReadRequest(stream, transferredView, false);
+            }
+        }
+        else if (ReadableStreamHasBYOBReader(stream)) {
+            // TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully.
+            ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+            ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);
+        }
+        else {
+            ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+        }
+        ReadableByteStreamControllerCallPullIfNeeded(controller);
+    }
+    function ReadableByteStreamControllerError(controller, e) {
+        const stream = controller._controlledReadableByteStream;
+        if (stream._state !== 'readable') {
+            return;
+        }
+        ReadableByteStreamControllerClearPendingPullIntos(controller);
+        ResetQueue(controller);
+        ReadableByteStreamControllerClearAlgorithms(controller);
+        ReadableStreamError(stream, e);
+    }
+    function ReadableByteStreamControllerGetBYOBRequest(controller) {
+        if (controller._byobRequest === null && controller._pendingPullIntos.length > 0) {
+            const firstDescriptor = controller._pendingPullIntos.peek();
+            const view = new Uint8Array(firstDescriptor.buffer, firstDescriptor.byteOffset + firstDescriptor.bytesFilled, firstDescriptor.byteLength - firstDescriptor.bytesFilled);
+            const byobRequest = Object.create(ReadableStreamBYOBRequest.prototype);
+            SetUpReadableStreamBYOBRequest(byobRequest, controller, view);
+            controller._byobRequest = byobRequest;
+        }
+        return controller._byobRequest;
+    }
+    function ReadableByteStreamControllerGetDesiredSize(controller) {
+        const state = controller._controlledReadableByteStream._state;
+        if (state === 'errored') {
+            return null;
+        }
+        if (state === 'closed') {
+            return 0;
+        }
+        return controller._strategyHWM - controller._queueTotalSize;
+    }
+    function ReadableByteStreamControllerRespond(controller, bytesWritten) {
+        const firstDescriptor = controller._pendingPullIntos.peek();
+        const state = controller._controlledReadableByteStream._state;
+        if (state === 'closed') {
+            if (bytesWritten !== 0) {
+                throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream');
+            }
+        }
+        else {
+            if (bytesWritten === 0) {
+                throw new TypeError('bytesWritten must be greater than 0 when calling respond() on a readable stream');
+            }
+            if (firstDescriptor.bytesFilled + bytesWritten > firstDescriptor.byteLength) {
+                throw new RangeError('bytesWritten out of range');
+            }
+        }
+        firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer);
+        ReadableByteStreamControllerRespondInternal(controller, bytesWritten);
+    }
+    function ReadableByteStreamControllerRespondWithNewView(controller, view) {
+        const firstDescriptor = controller._pendingPullIntos.peek();
+        const state = controller._controlledReadableByteStream._state;
+        if (state === 'closed') {
+            if (view.byteLength !== 0) {
+                throw new TypeError('The view\'s length must be 0 when calling respondWithNewView() on a closed stream');
+            }
+        }
+        else {
+            if (view.byteLength === 0) {
+                throw new TypeError('The view\'s length must be greater than 0 when calling respondWithNewView() on a readable stream');
+            }
+        }
+        if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) {
+            throw new RangeError('The region specified by view does not match byobRequest');
+        }
+        if (firstDescriptor.bufferByteLength !== view.buffer.byteLength) {
+            throw new RangeError('The buffer of view has different capacity than byobRequest');
+        }
+        if (firstDescriptor.bytesFilled + view.byteLength > firstDescriptor.byteLength) {
+            throw new RangeError('The region specified by view is larger than byobRequest');
+        }
+        const viewByteLength = view.byteLength;
+        firstDescriptor.buffer = TransferArrayBuffer(view.buffer);
+        ReadableByteStreamControllerRespondInternal(controller, viewByteLength);
+    }
+    function SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize) {
+        controller._controlledReadableByteStream = stream;
+        controller._pullAgain = false;
+        controller._pulling = false;
+        controller._byobRequest = null;
+        // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.
+        controller._queue = controller._queueTotalSize = undefined;
+        ResetQueue(controller);
+        controller._closeRequested = false;
+        controller._started = false;
+        controller._strategyHWM = highWaterMark;
+        controller._pullAlgorithm = pullAlgorithm;
+        controller._cancelAlgorithm = cancelAlgorithm;
+        controller._autoAllocateChunkSize = autoAllocateChunkSize;
+        controller._pendingPullIntos = new SimpleQueue();
+        stream._readableStreamController = controller;
+        const startResult = startAlgorithm();
+        uponPromise(promiseResolvedWith(startResult), () => {
+            controller._started = true;
+            ReadableByteStreamControllerCallPullIfNeeded(controller);
+        }, r => {
+            ReadableByteStreamControllerError(controller, r);
+        });
+    }
+    function SetUpReadableByteStreamControllerFromUnderlyingSource(stream, underlyingByteSource, highWaterMark) {
+        const controller = Object.create(ReadableByteStreamController.prototype);
+        let startAlgorithm = () => undefined;
+        let pullAlgorithm = () => promiseResolvedWith(undefined);
+        let cancelAlgorithm = () => promiseResolvedWith(undefined);
+        if (underlyingByteSource.start !== undefined) {
+            startAlgorithm = () => underlyingByteSource.start(controller);
+        }
+        if (underlyingByteSource.pull !== undefined) {
+            pullAlgorithm = () => underlyingByteSource.pull(controller);
+        }
+        if (underlyingByteSource.cancel !== undefined) {
+            cancelAlgorithm = reason => underlyingByteSource.cancel(reason);
+        }
+        const autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;
+        if (autoAllocateChunkSize === 0) {
+            throw new TypeError('autoAllocateChunkSize must be greater than 0');
+        }
+        SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize);
+    }
+    function SetUpReadableStreamBYOBRequest(request, controller, view) {
+        request._associatedReadableByteStreamController = controller;
+        request._view = view;
+    }
+    // Helper functions for the ReadableStreamBYOBRequest.
+    function byobRequestBrandCheckException(name) {
+        return new TypeError(`ReadableStreamBYOBRequest.prototype.${name} can only be used on a ReadableStreamBYOBRequest`);
+    }
+    // Helper functions for the ReadableByteStreamController.
+    function byteStreamControllerBrandCheckException(name) {
+        return new TypeError(`ReadableByteStreamController.prototype.${name} can only be used on a ReadableByteStreamController`);
+    }
+
+    // Abstract operations for the ReadableStream.
+    function AcquireReadableStreamBYOBReader(stream) {
+        return new ReadableStreamBYOBReader(stream);
+    }
+    // ReadableStream API exposed for controllers.
+    function ReadableStreamAddReadIntoRequest(stream, readIntoRequest) {
+        stream._reader._readIntoRequests.push(readIntoRequest);
+    }
+    function ReadableStreamFulfillReadIntoRequest(stream, chunk, done) {
+        const reader = stream._reader;
+        const readIntoRequest = reader._readIntoRequests.shift();
+        if (done) {
+            readIntoRequest._closeSteps(chunk);
+        }
+        else {
+            readIntoRequest._chunkSteps(chunk);
+        }
+    }
+    function ReadableStreamGetNumReadIntoRequests(stream) {
+        return stream._reader._readIntoRequests.length;
+    }
+    function ReadableStreamHasBYOBReader(stream) {
+        const reader = stream._reader;
+        if (reader === undefined) {
+            return false;
+        }
+        if (!IsReadableStreamBYOBReader(reader)) {
+            return false;
+        }
+        return true;
+    }
+    /**
+     * A BYOB reader vended by a {@link ReadableStream}.
+     *
+     * @public
+     */
+    class ReadableStreamBYOBReader {
+        constructor(stream) {
+            assertRequiredArgument(stream, 1, 'ReadableStreamBYOBReader');
+            assertReadableStream(stream, 'First parameter');
+            if (IsReadableStreamLocked(stream)) {
+                throw new TypeError('This stream has already been locked for exclusive reading by another reader');
+            }
+            if (!IsReadableByteStreamController(stream._readableStreamController)) {
+                throw new TypeError('Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte ' +
+                    'source');
+            }
+            ReadableStreamReaderGenericInitialize(this, stream);
+            this._readIntoRequests = new SimpleQueue();
+        }
+        /**
+         * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or
+         * the reader's lock is released before the stream finishes closing.
+         */
+        get closed() {
+            if (!IsReadableStreamBYOBReader(this)) {
+                return promiseRejectedWith(byobReaderBrandCheckException('closed'));
+            }
+            return this._closedPromise;
+        }
+        /**
+         * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.
+         */
+        cancel(reason = undefined) {
+            if (!IsReadableStreamBYOBReader(this)) {
+                return promiseRejectedWith(byobReaderBrandCheckException('cancel'));
+            }
+            if (this._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('cancel'));
+            }
+            return ReadableStreamReaderGenericCancel(this, reason);
+        }
+        /**
+         * Attempts to reads bytes into view, and returns a promise resolved with the result.
+         *
+         * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.
+         */
+        read(view) {
+            if (!IsReadableStreamBYOBReader(this)) {
+                return promiseRejectedWith(byobReaderBrandCheckException('read'));
+            }
+            if (!ArrayBuffer.isView(view)) {
+                return promiseRejectedWith(new TypeError('view must be an array buffer view'));
+            }
+            if (view.byteLength === 0) {
+                return promiseRejectedWith(new TypeError('view must have non-zero byteLength'));
+            }
+            if (view.buffer.byteLength === 0) {
+                return promiseRejectedWith(new TypeError(`view's buffer must have non-zero byteLength`));
+            }
+            if (IsDetachedBuffer(view.buffer)) ;
+            if (this._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('read from'));
+            }
+            let resolvePromise;
+            let rejectPromise;
+            const promise = newPromise((resolve, reject) => {
+                resolvePromise = resolve;
+                rejectPromise = reject;
+            });
+            const readIntoRequest = {
+                _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),
+                _closeSteps: chunk => resolvePromise({ value: chunk, done: true }),
+                _errorSteps: e => rejectPromise(e)
+            };
+            ReadableStreamBYOBReaderRead(this, view, readIntoRequest);
+            return promise;
+        }
+        /**
+         * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.
+         * If the associated stream is errored when the lock is released, the reader will appear errored in the same way
+         * from now on; otherwise, the reader will appear closed.
+         *
+         * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by
+         * the reader's {@link ReadableStreamBYOBReader.read | read()} method has not yet been settled. Attempting to
+         * do so will throw a `TypeError` and leave the reader locked to the stream.
+         */
+        releaseLock() {
+            if (!IsReadableStreamBYOBReader(this)) {
+                throw byobReaderBrandCheckException('releaseLock');
+            }
+            if (this._ownerReadableStream === undefined) {
+                return;
+            }
+            if (this._readIntoRequests.length > 0) {
+                throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');
+            }
+            ReadableStreamReaderGenericRelease(this);
+        }
+    }
+    Object.defineProperties(ReadableStreamBYOBReader.prototype, {
+        cancel: { enumerable: true },
+        read: { enumerable: true },
+        releaseLock: { enumerable: true },
+        closed: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableStreamBYOBReader.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableStreamBYOBReader',
+            configurable: true
+        });
+    }
+    // Abstract operations for the readers.
+    function IsReadableStreamBYOBReader(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_readIntoRequests')) {
+            return false;
+        }
+        return x instanceof ReadableStreamBYOBReader;
+    }
+    function ReadableStreamBYOBReaderRead(reader, view, readIntoRequest) {
+        const stream = reader._ownerReadableStream;
+        stream._disturbed = true;
+        if (stream._state === 'errored') {
+            readIntoRequest._errorSteps(stream._storedError);
+        }
+        else {
+            ReadableByteStreamControllerPullInto(stream._readableStreamController, view, readIntoRequest);
+        }
+    }
+    // Helper functions for the ReadableStreamBYOBReader.
+    function byobReaderBrandCheckException(name) {
+        return new TypeError(`ReadableStreamBYOBReader.prototype.${name} can only be used on a ReadableStreamBYOBReader`);
+    }
+
+    function ExtractHighWaterMark(strategy, defaultHWM) {
+        const { highWaterMark } = strategy;
+        if (highWaterMark === undefined) {
+            return defaultHWM;
+        }
+        if (NumberIsNaN(highWaterMark) || highWaterMark < 0) {
+            throw new RangeError('Invalid highWaterMark');
+        }
+        return highWaterMark;
+    }
+    function ExtractSizeAlgorithm(strategy) {
+        const { size } = strategy;
+        if (!size) {
+            return () => 1;
+        }
+        return size;
+    }
+
+    function convertQueuingStrategy(init, context) {
+        assertDictionary(init, context);
+        const highWaterMark = init === null || init === void 0 ? void 0 : init.highWaterMark;
+        const size = init === null || init === void 0 ? void 0 : init.size;
+        return {
+            highWaterMark: highWaterMark === undefined ? undefined : convertUnrestrictedDouble(highWaterMark),
+            size: size === undefined ? undefined : convertQueuingStrategySize(size, `${context} has member 'size' that`)
+        };
+    }
+    function convertQueuingStrategySize(fn, context) {
+        assertFunction(fn, context);
+        return chunk => convertUnrestrictedDouble(fn(chunk));
+    }
+
+    function convertUnderlyingSink(original, context) {
+        assertDictionary(original, context);
+        const abort = original === null || original === void 0 ? void 0 : original.abort;
+        const close = original === null || original === void 0 ? void 0 : original.close;
+        const start = original === null || original === void 0 ? void 0 : original.start;
+        const type = original === null || original === void 0 ? void 0 : original.type;
+        const write = original === null || original === void 0 ? void 0 : original.write;
+        return {
+            abort: abort === undefined ?
+                undefined :
+                convertUnderlyingSinkAbortCallback(abort, original, `${context} has member 'abort' that`),
+            close: close === undefined ?
+                undefined :
+                convertUnderlyingSinkCloseCallback(close, original, `${context} has member 'close' that`),
+            start: start === undefined ?
+                undefined :
+                convertUnderlyingSinkStartCallback(start, original, `${context} has member 'start' that`),
+            write: write === undefined ?
+                undefined :
+                convertUnderlyingSinkWriteCallback(write, original, `${context} has member 'write' that`),
+            type
+        };
+    }
+    function convertUnderlyingSinkAbortCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (reason) => promiseCall(fn, original, [reason]);
+    }
+    function convertUnderlyingSinkCloseCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return () => promiseCall(fn, original, []);
+    }
+    function convertUnderlyingSinkStartCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (controller) => reflectCall(fn, original, [controller]);
+    }
+    function convertUnderlyingSinkWriteCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (chunk, controller) => promiseCall(fn, original, [chunk, controller]);
+    }
+
+    function assertWritableStream(x, context) {
+        if (!IsWritableStream(x)) {
+            throw new TypeError(`${context} is not a WritableStream.`);
+        }
+    }
+
+    function isAbortSignal(value) {
+        if (typeof value !== 'object' || value === null) {
+            return false;
+        }
+        try {
+            return typeof value.aborted === 'boolean';
+        }
+        catch (_a) {
+            // AbortSignal.prototype.aborted throws if its brand check fails
+            return false;
+        }
+    }
+    const supportsAbortController = typeof AbortController === 'function';
+    /**
+     * Construct a new AbortController, if supported by the platform.
+     *
+     * @internal
+     */
+    function createAbortController() {
+        if (supportsAbortController) {
+            return new AbortController();
+        }
+        return undefined;
+    }
+
+    /**
+     * A writable stream represents a destination for data, into which you can write.
+     *
+     * @public
+     */
+    class WritableStream {
+        constructor(rawUnderlyingSink = {}, rawStrategy = {}) {
+            if (rawUnderlyingSink === undefined) {
+                rawUnderlyingSink = null;
+            }
+            else {
+                assertObject(rawUnderlyingSink, 'First parameter');
+            }
+            const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');
+            const underlyingSink = convertUnderlyingSink(rawUnderlyingSink, 'First parameter');
+            InitializeWritableStream(this);
+            const type = underlyingSink.type;
+            if (type !== undefined) {
+                throw new RangeError('Invalid type is specified');
+            }
+            const sizeAlgorithm = ExtractSizeAlgorithm(strategy);
+            const highWaterMark = ExtractHighWaterMark(strategy, 1);
+            SetUpWritableStreamDefaultControllerFromUnderlyingSink(this, underlyingSink, highWaterMark, sizeAlgorithm);
+        }
+        /**
+         * Returns whether or not the writable stream is locked to a writer.
+         */
+        get locked() {
+            if (!IsWritableStream(this)) {
+                throw streamBrandCheckException$2('locked');
+            }
+            return IsWritableStreamLocked(this);
+        }
+        /**
+         * Aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be
+         * immediately moved to an errored state, with any queued-up writes discarded. This will also execute any abort
+         * mechanism of the underlying sink.
+         *
+         * The returned promise will fulfill if the stream shuts down successfully, or reject if the underlying sink signaled
+         * that there was an error doing so. Additionally, it will reject with a `TypeError` (without attempting to cancel
+         * the stream) if the stream is currently locked.
+         */
+        abort(reason = undefined) {
+            if (!IsWritableStream(this)) {
+                return promiseRejectedWith(streamBrandCheckException$2('abort'));
+            }
+            if (IsWritableStreamLocked(this)) {
+                return promiseRejectedWith(new TypeError('Cannot abort a stream that already has a writer'));
+            }
+            return WritableStreamAbort(this, reason);
+        }
+        /**
+         * Closes the stream. The underlying sink will finish processing any previously-written chunks, before invoking its
+         * close behavior. During this time any further attempts to write will fail (without erroring the stream).
+         *
+         * The method returns a promise that will fulfill if all remaining chunks are successfully written and the stream
+         * successfully closes, or rejects if an error is encountered during this process. Additionally, it will reject with
+         * a `TypeError` (without attempting to cancel the stream) if the stream is currently locked.
+         */
+        close() {
+            if (!IsWritableStream(this)) {
+                return promiseRejectedWith(streamBrandCheckException$2('close'));
+            }
+            if (IsWritableStreamLocked(this)) {
+                return promiseRejectedWith(new TypeError('Cannot close a stream that already has a writer'));
+            }
+            if (WritableStreamCloseQueuedOrInFlight(this)) {
+                return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));
+            }
+            return WritableStreamClose(this);
+        }
+        /**
+         * Creates a {@link WritableStreamDefaultWriter | writer} and locks the stream to the new writer. While the stream
+         * is locked, no other writer can be acquired until this one is released.
+         *
+         * This functionality is especially useful for creating abstractions that desire the ability to write to a stream
+         * without interruption or interleaving. By getting a writer for the stream, you can ensure nobody else can write at
+         * the same time, which would cause the resulting written data to be unpredictable and probably useless.
+         */
+        getWriter() {
+            if (!IsWritableStream(this)) {
+                throw streamBrandCheckException$2('getWriter');
+            }
+            return AcquireWritableStreamDefaultWriter(this);
+        }
+    }
+    Object.defineProperties(WritableStream.prototype, {
+        abort: { enumerable: true },
+        close: { enumerable: true },
+        getWriter: { enumerable: true },
+        locked: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(WritableStream.prototype, SymbolPolyfill.toStringTag, {
+            value: 'WritableStream',
+            configurable: true
+        });
+    }
+    // Abstract operations for the WritableStream.
+    function AcquireWritableStreamDefaultWriter(stream) {
+        return new WritableStreamDefaultWriter(stream);
+    }
+    // Throws if and only if startAlgorithm throws.
+    function CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark = 1, sizeAlgorithm = () => 1) {
+        const stream = Object.create(WritableStream.prototype);
+        InitializeWritableStream(stream);
+        const controller = Object.create(WritableStreamDefaultController.prototype);
+        SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm);
+        return stream;
+    }
+    function InitializeWritableStream(stream) {
+        stream._state = 'writable';
+        // The error that will be reported by new method calls once the state becomes errored. Only set when [[state]] is
+        // 'erroring' or 'errored'. May be set to an undefined value.
+        stream._storedError = undefined;
+        stream._writer = undefined;
+        // Initialize to undefined first because the constructor of the controller checks this
+        // variable to validate the caller.
+        stream._writableStreamController = undefined;
+        // This queue is placed here instead of the writer class in order to allow for passing a writer to the next data
+        // producer without waiting for the queued writes to finish.
+        stream._writeRequests = new SimpleQueue();
+        // Write requests are removed from _writeRequests when write() is called on the underlying sink. This prevents
+        // them from being erroneously rejected on error. If a write() call is in-flight, the request is stored here.
+        stream._inFlightWriteRequest = undefined;
+        // The promise that was returned from writer.close(). Stored here because it may be fulfilled after the writer
+        // has been detached.
+        stream._closeRequest = undefined;
+        // Close request is removed from _closeRequest when close() is called on the underlying sink. This prevents it
+        // from being erroneously rejected on error. If a close() call is in-flight, the request is stored here.
+        stream._inFlightCloseRequest = undefined;
+        // The promise that was returned from writer.abort(). This may also be fulfilled after the writer has detached.
+        stream._pendingAbortRequest = undefined;
+        // The backpressure signal set by the controller.
+        stream._backpressure = false;
+    }
+    function IsWritableStream(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_writableStreamController')) {
+            return false;
+        }
+        return x instanceof WritableStream;
+    }
+    function IsWritableStreamLocked(stream) {
+        if (stream._writer === undefined) {
+            return false;
+        }
+        return true;
+    }
+    function WritableStreamAbort(stream, reason) {
+        var _a;
+        if (stream._state === 'closed' || stream._state === 'errored') {
+            return promiseResolvedWith(undefined);
+        }
+        stream._writableStreamController._abortReason = reason;
+        (_a = stream._writableStreamController._abortController) === null || _a === void 0 ? void 0 : _a.abort();
+        // TypeScript narrows the type of `stream._state` down to 'writable' | 'erroring',
+        // but it doesn't know that signaling abort runs author code that might have changed the state.
+        // Widen the type again by casting to WritableStreamState.
+        const state = stream._state;
+        if (state === 'closed' || state === 'errored') {
+            return promiseResolvedWith(undefined);
+        }
+        if (stream._pendingAbortRequest !== undefined) {
+            return stream._pendingAbortRequest._promise;
+        }
+        let wasAlreadyErroring = false;
+        if (state === 'erroring') {
+            wasAlreadyErroring = true;
+            // reason will not be used, so don't keep a reference to it.
+            reason = undefined;
+        }
+        const promise = newPromise((resolve, reject) => {
+            stream._pendingAbortRequest = {
+                _promise: undefined,
+                _resolve: resolve,
+                _reject: reject,
+                _reason: reason,
+                _wasAlreadyErroring: wasAlreadyErroring
+            };
+        });
+        stream._pendingAbortRequest._promise = promise;
+        if (!wasAlreadyErroring) {
+            WritableStreamStartErroring(stream, reason);
+        }
+        return promise;
+    }
+    function WritableStreamClose(stream) {
+        const state = stream._state;
+        if (state === 'closed' || state === 'errored') {
+            return promiseRejectedWith(new TypeError(`The stream (in ${state} state) is not in the writable state and cannot be closed`));
+        }
+        const promise = newPromise((resolve, reject) => {
+            const closeRequest = {
+                _resolve: resolve,
+                _reject: reject
+            };
+            stream._closeRequest = closeRequest;
+        });
+        const writer = stream._writer;
+        if (writer !== undefined && stream._backpressure && state === 'writable') {
+            defaultWriterReadyPromiseResolve(writer);
+        }
+        WritableStreamDefaultControllerClose(stream._writableStreamController);
+        return promise;
+    }
+    // WritableStream API exposed for controllers.
+    function WritableStreamAddWriteRequest(stream) {
+        const promise = newPromise((resolve, reject) => {
+            const writeRequest = {
+                _resolve: resolve,
+                _reject: reject
+            };
+            stream._writeRequests.push(writeRequest);
+        });
+        return promise;
+    }
+    function WritableStreamDealWithRejection(stream, error) {
+        const state = stream._state;
+        if (state === 'writable') {
+            WritableStreamStartErroring(stream, error);
+            return;
+        }
+        WritableStreamFinishErroring(stream);
+    }
+    function WritableStreamStartErroring(stream, reason) {
+        const controller = stream._writableStreamController;
+        stream._state = 'erroring';
+        stream._storedError = reason;
+        const writer = stream._writer;
+        if (writer !== undefined) {
+            WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);
+        }
+        if (!WritableStreamHasOperationMarkedInFlight(stream) && controller._started) {
+            WritableStreamFinishErroring(stream);
+        }
+    }
+    function WritableStreamFinishErroring(stream) {
+        stream._state = 'errored';
+        stream._writableStreamController[ErrorSteps]();
+        const storedError = stream._storedError;
+        stream._writeRequests.forEach(writeRequest => {
+            writeRequest._reject(storedError);
+        });
+        stream._writeRequests = new SimpleQueue();
+        if (stream._pendingAbortRequest === undefined) {
+            WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+            return;
+        }
+        const abortRequest = stream._pendingAbortRequest;
+        stream._pendingAbortRequest = undefined;
+        if (abortRequest._wasAlreadyErroring) {
+            abortRequest._reject(storedError);
+            WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+            return;
+        }
+        const promise = stream._writableStreamController[AbortSteps](abortRequest._reason);
+        uponPromise(promise, () => {
+            abortRequest._resolve();
+            WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+        }, (reason) => {
+            abortRequest._reject(reason);
+            WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+        });
+    }
+    function WritableStreamFinishInFlightWrite(stream) {
+        stream._inFlightWriteRequest._resolve(undefined);
+        stream._inFlightWriteRequest = undefined;
+    }
+    function WritableStreamFinishInFlightWriteWithError(stream, error) {
+        stream._inFlightWriteRequest._reject(error);
+        stream._inFlightWriteRequest = undefined;
+        WritableStreamDealWithRejection(stream, error);
+    }
+    function WritableStreamFinishInFlightClose(stream) {
+        stream._inFlightCloseRequest._resolve(undefined);
+        stream._inFlightCloseRequest = undefined;
+        const state = stream._state;
+        if (state === 'erroring') {
+            // The error was too late to do anything, so it is ignored.
+            stream._storedError = undefined;
+            if (stream._pendingAbortRequest !== undefined) {
+                stream._pendingAbortRequest._resolve();
+                stream._pendingAbortRequest = undefined;
+            }
+        }
+        stream._state = 'closed';
+        const writer = stream._writer;
+        if (writer !== undefined) {
+            defaultWriterClosedPromiseResolve(writer);
+        }
+    }
+    function WritableStreamFinishInFlightCloseWithError(stream, error) {
+        stream._inFlightCloseRequest._reject(error);
+        stream._inFlightCloseRequest = undefined;
+        // Never execute sink abort() after sink close().
+        if (stream._pendingAbortRequest !== undefined) {
+            stream._pendingAbortRequest._reject(error);
+            stream._pendingAbortRequest = undefined;
+        }
+        WritableStreamDealWithRejection(stream, error);
+    }
+    // TODO(ricea): Fix alphabetical order.
+    function WritableStreamCloseQueuedOrInFlight(stream) {
+        if (stream._closeRequest === undefined && stream._inFlightCloseRequest === undefined) {
+            return false;
+        }
+        return true;
+    }
+    function WritableStreamHasOperationMarkedInFlight(stream) {
+        if (stream._inFlightWriteRequest === undefined && stream._inFlightCloseRequest === undefined) {
+            return false;
+        }
+        return true;
+    }
+    function WritableStreamMarkCloseRequestInFlight(stream) {
+        stream._inFlightCloseRequest = stream._closeRequest;
+        stream._closeRequest = undefined;
+    }
+    function WritableStreamMarkFirstWriteRequestInFlight(stream) {
+        stream._inFlightWriteRequest = stream._writeRequests.shift();
+    }
+    function WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream) {
+        if (stream._closeRequest !== undefined) {
+            stream._closeRequest._reject(stream._storedError);
+            stream._closeRequest = undefined;
+        }
+        const writer = stream._writer;
+        if (writer !== undefined) {
+            defaultWriterClosedPromiseReject(writer, stream._storedError);
+        }
+    }
+    function WritableStreamUpdateBackpressure(stream, backpressure) {
+        const writer = stream._writer;
+        if (writer !== undefined && backpressure !== stream._backpressure) {
+            if (backpressure) {
+                defaultWriterReadyPromiseReset(writer);
+            }
+            else {
+                defaultWriterReadyPromiseResolve(writer);
+            }
+        }
+        stream._backpressure = backpressure;
+    }
+    /**
+     * A default writer vended by a {@link WritableStream}.
+     *
+     * @public
+     */
+    class WritableStreamDefaultWriter {
+        constructor(stream) {
+            assertRequiredArgument(stream, 1, 'WritableStreamDefaultWriter');
+            assertWritableStream(stream, 'First parameter');
+            if (IsWritableStreamLocked(stream)) {
+                throw new TypeError('This stream has already been locked for exclusive writing by another writer');
+            }
+            this._ownerWritableStream = stream;
+            stream._writer = this;
+            const state = stream._state;
+            if (state === 'writable') {
+                if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._backpressure) {
+                    defaultWriterReadyPromiseInitialize(this);
+                }
+                else {
+                    defaultWriterReadyPromiseInitializeAsResolved(this);
+                }
+                defaultWriterClosedPromiseInitialize(this);
+            }
+            else if (state === 'erroring') {
+                defaultWriterReadyPromiseInitializeAsRejected(this, stream._storedError);
+                defaultWriterClosedPromiseInitialize(this);
+            }
+            else if (state === 'closed') {
+                defaultWriterReadyPromiseInitializeAsResolved(this);
+                defaultWriterClosedPromiseInitializeAsResolved(this);
+            }
+            else {
+                const storedError = stream._storedError;
+                defaultWriterReadyPromiseInitializeAsRejected(this, storedError);
+                defaultWriterClosedPromiseInitializeAsRejected(this, storedError);
+            }
+        }
+        /**
+         * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or
+         * the writer’s lock is released before the stream finishes closing.
+         */
+        get closed() {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                return promiseRejectedWith(defaultWriterBrandCheckException('closed'));
+            }
+            return this._closedPromise;
+        }
+        /**
+         * Returns the desired size to fill the stream’s internal queue. It can be negative, if the queue is over-full.
+         * A producer can use this information to determine the right amount of data to write.
+         *
+         * It will be `null` if the stream cannot be successfully written to (due to either being errored, or having an abort
+         * queued up). It will return zero if the stream is closed. And the getter will throw an exception if invoked when
+         * the writer’s lock is released.
+         */
+        get desiredSize() {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                throw defaultWriterBrandCheckException('desiredSize');
+            }
+            if (this._ownerWritableStream === undefined) {
+                throw defaultWriterLockException('desiredSize');
+            }
+            return WritableStreamDefaultWriterGetDesiredSize(this);
+        }
+        /**
+         * Returns a promise that will be fulfilled when the desired size to fill the stream’s internal queue transitions
+         * from non-positive to positive, signaling that it is no longer applying backpressure. Once the desired size dips
+         * back to zero or below, the getter will return a new promise that stays pending until the next transition.
+         *
+         * If the stream becomes errored or aborted, or the writer’s lock is released, the returned promise will become
+         * rejected.
+         */
+        get ready() {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                return promiseRejectedWith(defaultWriterBrandCheckException('ready'));
+            }
+            return this._readyPromise;
+        }
+        /**
+         * If the reader is active, behaves the same as {@link WritableStream.abort | stream.abort(reason)}.
+         */
+        abort(reason = undefined) {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                return promiseRejectedWith(defaultWriterBrandCheckException('abort'));
+            }
+            if (this._ownerWritableStream === undefined) {
+                return promiseRejectedWith(defaultWriterLockException('abort'));
+            }
+            return WritableStreamDefaultWriterAbort(this, reason);
+        }
+        /**
+         * If the reader is active, behaves the same as {@link WritableStream.close | stream.close()}.
+         */
+        close() {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                return promiseRejectedWith(defaultWriterBrandCheckException('close'));
+            }
+            const stream = this._ownerWritableStream;
+            if (stream === undefined) {
+                return promiseRejectedWith(defaultWriterLockException('close'));
+            }
+            if (WritableStreamCloseQueuedOrInFlight(stream)) {
+                return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));
+            }
+            return WritableStreamDefaultWriterClose(this);
+        }
+        /**
+         * Releases the writer’s lock on the corresponding stream. After the lock is released, the writer is no longer active.
+         * If the associated stream is errored when the lock is released, the writer will appear errored in the same way from
+         * now on; otherwise, the writer will appear closed.
+         *
+         * Note that the lock can still be released even if some ongoing writes have not yet finished (i.e. even if the
+         * promises returned from previous calls to {@link WritableStreamDefaultWriter.write | write()} have not yet settled).
+         * It’s not necessary to hold the lock on the writer for the duration of the write; the lock instead simply prevents
+         * other producers from writing in an interleaved manner.
+         */
+        releaseLock() {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                throw defaultWriterBrandCheckException('releaseLock');
+            }
+            const stream = this._ownerWritableStream;
+            if (stream === undefined) {
+                return;
+            }
+            WritableStreamDefaultWriterRelease(this);
+        }
+        write(chunk = undefined) {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                return promiseRejectedWith(defaultWriterBrandCheckException('write'));
+            }
+            if (this._ownerWritableStream === undefined) {
+                return promiseRejectedWith(defaultWriterLockException('write to'));
+            }
+            return WritableStreamDefaultWriterWrite(this, chunk);
+        }
+    }
+    Object.defineProperties(WritableStreamDefaultWriter.prototype, {
+        abort: { enumerable: true },
+        close: { enumerable: true },
+        releaseLock: { enumerable: true },
+        write: { enumerable: true },
+        closed: { enumerable: true },
+        desiredSize: { enumerable: true },
+        ready: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(WritableStreamDefaultWriter.prototype, SymbolPolyfill.toStringTag, {
+            value: 'WritableStreamDefaultWriter',
+            configurable: true
+        });
+    }
+    // Abstract operations for the WritableStreamDefaultWriter.
+    function IsWritableStreamDefaultWriter(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) {
+            return false;
+        }
+        return x instanceof WritableStreamDefaultWriter;
+    }
+    // A client of WritableStreamDefaultWriter may use these functions directly to bypass state check.
+    function WritableStreamDefaultWriterAbort(writer, reason) {
+        const stream = writer._ownerWritableStream;
+        return WritableStreamAbort(stream, reason);
+    }
+    function WritableStreamDefaultWriterClose(writer) {
+        const stream = writer._ownerWritableStream;
+        return WritableStreamClose(stream);
+    }
+    function WritableStreamDefaultWriterCloseWithErrorPropagation(writer) {
+        const stream = writer._ownerWritableStream;
+        const state = stream._state;
+        if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {
+            return promiseResolvedWith(undefined);
+        }
+        if (state === 'errored') {
+            return promiseRejectedWith(stream._storedError);
+        }
+        return WritableStreamDefaultWriterClose(writer);
+    }
+    function WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, error) {
+        if (writer._closedPromiseState === 'pending') {
+            defaultWriterClosedPromiseReject(writer, error);
+        }
+        else {
+            defaultWriterClosedPromiseResetToRejected(writer, error);
+        }
+    }
+    function WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, error) {
+        if (writer._readyPromiseState === 'pending') {
+            defaultWriterReadyPromiseReject(writer, error);
+        }
+        else {
+            defaultWriterReadyPromiseResetToRejected(writer, error);
+        }
+    }
+    function WritableStreamDefaultWriterGetDesiredSize(writer) {
+        const stream = writer._ownerWritableStream;
+        const state = stream._state;
+        if (state === 'errored' || state === 'erroring') {
+            return null;
+        }
+        if (state === 'closed') {
+            return 0;
+        }
+        return WritableStreamDefaultControllerGetDesiredSize(stream._writableStreamController);
+    }
+    function WritableStreamDefaultWriterRelease(writer) {
+        const stream = writer._ownerWritableStream;
+        const releasedError = new TypeError(`Writer was released and can no longer be used to monitor the stream's closedness`);
+        WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, releasedError);
+        // The state transitions to "errored" before the sink abort() method runs, but the writer.closed promise is not
+        // rejected until afterwards. This means that simply testing state will not work.
+        WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, releasedError);
+        stream._writer = undefined;
+        writer._ownerWritableStream = undefined;
+    }
+    function WritableStreamDefaultWriterWrite(writer, chunk) {
+        const stream = writer._ownerWritableStream;
+        const controller = stream._writableStreamController;
+        const chunkSize = WritableStreamDefaultControllerGetChunkSize(controller, chunk);
+        if (stream !== writer._ownerWritableStream) {
+            return promiseRejectedWith(defaultWriterLockException('write to'));
+        }
+        const state = stream._state;
+        if (state === 'errored') {
+            return promiseRejectedWith(stream._storedError);
+        }
+        if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {
+            return promiseRejectedWith(new TypeError('The stream is closing or closed and cannot be written to'));
+        }
+        if (state === 'erroring') {
+            return promiseRejectedWith(stream._storedError);
+        }
+        const promise = WritableStreamAddWriteRequest(stream);
+        WritableStreamDefaultControllerWrite(controller, chunk, chunkSize);
+        return promise;
+    }
+    const closeSentinel = {};
+    /**
+     * Allows control of a {@link WritableStream | writable stream}'s state and internal queue.
+     *
+     * @public
+     */
+    class WritableStreamDefaultController {
+        constructor() {
+            throw new TypeError('Illegal constructor');
+        }
+        /**
+         * The reason which was passed to `WritableStream.abort(reason)` when the stream was aborted.
+         *
+         * @deprecated
+         *  This property has been removed from the specification, see https://github.com/whatwg/streams/pull/1177.
+         *  Use {@link WritableStreamDefaultController.signal}'s `reason` instead.
+         */
+        get abortReason() {
+            if (!IsWritableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$2('abortReason');
+            }
+            return this._abortReason;
+        }
+        /**
+         * An `AbortSignal` that can be used to abort the pending write or close operation when the stream is aborted.
+         */
+        get signal() {
+            if (!IsWritableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$2('signal');
+            }
+            if (this._abortController === undefined) {
+                // Older browsers or older Node versions may not support `AbortController` or `AbortSignal`.
+                // We don't want to bundle and ship an `AbortController` polyfill together with our polyfill,
+                // so instead we only implement support for `signal` if we find a global `AbortController` constructor.
+                throw new TypeError('WritableStreamDefaultController.prototype.signal is not supported');
+            }
+            return this._abortController.signal;
+        }
+        /**
+         * Closes the controlled writable stream, making all future interactions with it fail with the given error `e`.
+         *
+         * This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying
+         * sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the
+         * normal lifecycle of interactions with the underlying sink.
+         */
+        error(e = undefined) {
+            if (!IsWritableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$2('error');
+            }
+            const state = this._controlledWritableStream._state;
+            if (state !== 'writable') {
+                // The stream is closed, errored or will be soon. The sink can't do anything useful if it gets an error here, so
+                // just treat it as a no-op.
+                return;
+            }
+            WritableStreamDefaultControllerError(this, e);
+        }
+        /** @internal */
+        [AbortSteps](reason) {
+            const result = this._abortAlgorithm(reason);
+            WritableStreamDefaultControllerClearAlgorithms(this);
+            return result;
+        }
+        /** @internal */
+        [ErrorSteps]() {
+            ResetQueue(this);
+        }
+    }
+    Object.defineProperties(WritableStreamDefaultController.prototype, {
+        abortReason: { enumerable: true },
+        signal: { enumerable: true },
+        error: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(WritableStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+            value: 'WritableStreamDefaultController',
+            configurable: true
+        });
+    }
+    // Abstract operations implementing interface required by the WritableStream.
+    function IsWritableStreamDefaultController(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_controlledWritableStream')) {
+            return false;
+        }
+        return x instanceof WritableStreamDefaultController;
+    }
+    function SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm) {
+        controller._controlledWritableStream = stream;
+        stream._writableStreamController = controller;
+        // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.
+        controller._queue = undefined;
+        controller._queueTotalSize = undefined;
+        ResetQueue(controller);
+        controller._abortReason = undefined;
+        controller._abortController = createAbortController();
+        controller._started = false;
+        controller._strategySizeAlgorithm = sizeAlgorithm;
+        controller._strategyHWM = highWaterMark;
+        controller._writeAlgorithm = writeAlgorithm;
+        controller._closeAlgorithm = closeAlgorithm;
+        controller._abortAlgorithm = abortAlgorithm;
+        const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+        WritableStreamUpdateBackpressure(stream, backpressure);
+        const startResult = startAlgorithm();
+        const startPromise = promiseResolvedWith(startResult);
+        uponPromise(startPromise, () => {
+            controller._started = true;
+            WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+        }, r => {
+            controller._started = true;
+            WritableStreamDealWithRejection(stream, r);
+        });
+    }
+    function SetUpWritableStreamDefaultControllerFromUnderlyingSink(stream, underlyingSink, highWaterMark, sizeAlgorithm) {
+        const controller = Object.create(WritableStreamDefaultController.prototype);
+        let startAlgorithm = () => undefined;
+        let writeAlgorithm = () => promiseResolvedWith(undefined);
+        let closeAlgorithm = () => promiseResolvedWith(undefined);
+        let abortAlgorithm = () => promiseResolvedWith(undefined);
+        if (underlyingSink.start !== undefined) {
+            startAlgorithm = () => underlyingSink.start(controller);
+        }
+        if (underlyingSink.write !== undefined) {
+            writeAlgorithm = chunk => underlyingSink.write(chunk, controller);
+        }
+        if (underlyingSink.close !== undefined) {
+            closeAlgorithm = () => underlyingSink.close();
+        }
+        if (underlyingSink.abort !== undefined) {
+            abortAlgorithm = reason => underlyingSink.abort(reason);
+        }
+        SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm);
+    }
+    // ClearAlgorithms may be called twice. Erroring the same stream in multiple ways will often result in redundant calls.
+    function WritableStreamDefaultControllerClearAlgorithms(controller) {
+        controller._writeAlgorithm = undefined;
+        controller._closeAlgorithm = undefined;
+        controller._abortAlgorithm = undefined;
+        controller._strategySizeAlgorithm = undefined;
+    }
+    function WritableStreamDefaultControllerClose(controller) {
+        EnqueueValueWithSize(controller, closeSentinel, 0);
+        WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+    }
+    function WritableStreamDefaultControllerGetChunkSize(controller, chunk) {
+        try {
+            return controller._strategySizeAlgorithm(chunk);
+        }
+        catch (chunkSizeE) {
+            WritableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE);
+            return 1;
+        }
+    }
+    function WritableStreamDefaultControllerGetDesiredSize(controller) {
+        return controller._strategyHWM - controller._queueTotalSize;
+    }
+    function WritableStreamDefaultControllerWrite(controller, chunk, chunkSize) {
+        try {
+            EnqueueValueWithSize(controller, chunk, chunkSize);
+        }
+        catch (enqueueE) {
+            WritableStreamDefaultControllerErrorIfNeeded(controller, enqueueE);
+            return;
+        }
+        const stream = controller._controlledWritableStream;
+        if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._state === 'writable') {
+            const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+            WritableStreamUpdateBackpressure(stream, backpressure);
+        }
+        WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+    }
+    // Abstract operations for the WritableStreamDefaultController.
+    function WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller) {
+        const stream = controller._controlledWritableStream;
+        if (!controller._started) {
+            return;
+        }
+        if (stream._inFlightWriteRequest !== undefined) {
+            return;
+        }
+        const state = stream._state;
+        if (state === 'erroring') {
+            WritableStreamFinishErroring(stream);
+            return;
+        }
+        if (controller._queue.length === 0) {
+            return;
+        }
+        const value = PeekQueueValue(controller);
+        if (value === closeSentinel) {
+            WritableStreamDefaultControllerProcessClose(controller);
+        }
+        else {
+            WritableStreamDefaultControllerProcessWrite(controller, value);
+        }
+    }
+    function WritableStreamDefaultControllerErrorIfNeeded(controller, error) {
+        if (controller._controlledWritableStream._state === 'writable') {
+            WritableStreamDefaultControllerError(controller, error);
+        }
+    }
+    function WritableStreamDefaultControllerProcessClose(controller) {
+        const stream = controller._controlledWritableStream;
+        WritableStreamMarkCloseRequestInFlight(stream);
+        DequeueValue(controller);
+        const sinkClosePromise = controller._closeAlgorithm();
+        WritableStreamDefaultControllerClearAlgorithms(controller);
+        uponPromise(sinkClosePromise, () => {
+            WritableStreamFinishInFlightClose(stream);
+        }, reason => {
+            WritableStreamFinishInFlightCloseWithError(stream, reason);
+        });
+    }
+    function WritableStreamDefaultControllerProcessWrite(controller, chunk) {
+        const stream = controller._controlledWritableStream;
+        WritableStreamMarkFirstWriteRequestInFlight(stream);
+        const sinkWritePromise = controller._writeAlgorithm(chunk);
+        uponPromise(sinkWritePromise, () => {
+            WritableStreamFinishInFlightWrite(stream);
+            const state = stream._state;
+            DequeueValue(controller);
+            if (!WritableStreamCloseQueuedOrInFlight(stream) && state === 'writable') {
+                const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+                WritableStreamUpdateBackpressure(stream, backpressure);
+            }
+            WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+        }, reason => {
+            if (stream._state === 'writable') {
+                WritableStreamDefaultControllerClearAlgorithms(controller);
+            }
+            WritableStreamFinishInFlightWriteWithError(stream, reason);
+        });
+    }
+    function WritableStreamDefaultControllerGetBackpressure(controller) {
+        const desiredSize = WritableStreamDefaultControllerGetDesiredSize(controller);
+        return desiredSize <= 0;
+    }
+    // A client of WritableStreamDefaultController may use these functions directly to bypass state check.
+    function WritableStreamDefaultControllerError(controller, error) {
+        const stream = controller._controlledWritableStream;
+        WritableStreamDefaultControllerClearAlgorithms(controller);
+        WritableStreamStartErroring(stream, error);
+    }
+    // Helper functions for the WritableStream.
+    function streamBrandCheckException$2(name) {
+        return new TypeError(`WritableStream.prototype.${name} can only be used on a WritableStream`);
+    }
+    // Helper functions for the WritableStreamDefaultController.
+    function defaultControllerBrandCheckException$2(name) {
+        return new TypeError(`WritableStreamDefaultController.prototype.${name} can only be used on a WritableStreamDefaultController`);
+    }
+    // Helper functions for the WritableStreamDefaultWriter.
+    function defaultWriterBrandCheckException(name) {
+        return new TypeError(`WritableStreamDefaultWriter.prototype.${name} can only be used on a WritableStreamDefaultWriter`);
+    }
+    function defaultWriterLockException(name) {
+        return new TypeError('Cannot ' + name + ' a stream using a released writer');
+    }
+    function defaultWriterClosedPromiseInitialize(writer) {
+        writer._closedPromise = newPromise((resolve, reject) => {
+            writer._closedPromise_resolve = resolve;
+            writer._closedPromise_reject = reject;
+            writer._closedPromiseState = 'pending';
+        });
+    }
+    function defaultWriterClosedPromiseInitializeAsRejected(writer, reason) {
+        defaultWriterClosedPromiseInitialize(writer);
+        defaultWriterClosedPromiseReject(writer, reason);
+    }
+    function defaultWriterClosedPromiseInitializeAsResolved(writer) {
+        defaultWriterClosedPromiseInitialize(writer);
+        defaultWriterClosedPromiseResolve(writer);
+    }
+    function defaultWriterClosedPromiseReject(writer, reason) {
+        if (writer._closedPromise_reject === undefined) {
+            return;
+        }
+        setPromiseIsHandledToTrue(writer._closedPromise);
+        writer._closedPromise_reject(reason);
+        writer._closedPromise_resolve = undefined;
+        writer._closedPromise_reject = undefined;
+        writer._closedPromiseState = 'rejected';
+    }
+    function defaultWriterClosedPromiseResetToRejected(writer, reason) {
+        defaultWriterClosedPromiseInitializeAsRejected(writer, reason);
+    }
+    function defaultWriterClosedPromiseResolve(writer) {
+        if (writer._closedPromise_resolve === undefined) {
+            return;
+        }
+        writer._closedPromise_resolve(undefined);
+        writer._closedPromise_resolve = undefined;
+        writer._closedPromise_reject = undefined;
+        writer._closedPromiseState = 'resolved';
+    }
+    function defaultWriterReadyPromiseInitialize(writer) {
+        writer._readyPromise = newPromise((resolve, reject) => {
+            writer._readyPromise_resolve = resolve;
+            writer._readyPromise_reject = reject;
+        });
+        writer._readyPromiseState = 'pending';
+    }
+    function defaultWriterReadyPromiseInitializeAsRejected(writer, reason) {
+        defaultWriterReadyPromiseInitialize(writer);
+        defaultWriterReadyPromiseReject(writer, reason);
+    }
+    function defaultWriterReadyPromiseInitializeAsResolved(writer) {
+        defaultWriterReadyPromiseInitialize(writer);
+        defaultWriterReadyPromiseResolve(writer);
+    }
+    function defaultWriterReadyPromiseReject(writer, reason) {
+        if (writer._readyPromise_reject === undefined) {
+            return;
+        }
+        setPromiseIsHandledToTrue(writer._readyPromise);
+        writer._readyPromise_reject(reason);
+        writer._readyPromise_resolve = undefined;
+        writer._readyPromise_reject = undefined;
+        writer._readyPromiseState = 'rejected';
+    }
+    function defaultWriterReadyPromiseReset(writer) {
+        defaultWriterReadyPromiseInitialize(writer);
+    }
+    function defaultWriterReadyPromiseResetToRejected(writer, reason) {
+        defaultWriterReadyPromiseInitializeAsRejected(writer, reason);
+    }
+    function defaultWriterReadyPromiseResolve(writer) {
+        if (writer._readyPromise_resolve === undefined) {
+            return;
+        }
+        writer._readyPromise_resolve(undefined);
+        writer._readyPromise_resolve = undefined;
+        writer._readyPromise_reject = undefined;
+        writer._readyPromiseState = 'fulfilled';
+    }
+
+    /// <reference lib="dom" />
+    const NativeDOMException = typeof DOMException !== 'undefined' ? DOMException : undefined;
+
+    /// <reference types="node" />
+    function isDOMExceptionConstructor(ctor) {
+        if (!(typeof ctor === 'function' || typeof ctor === 'object')) {
+            return false;
+        }
+        try {
+            new ctor();
+            return true;
+        }
+        catch (_a) {
+            return false;
+        }
+    }
+    function createDOMExceptionPolyfill() {
+        // eslint-disable-next-line no-shadow
+        const ctor = function DOMException(message, name) {
+            this.message = message || '';
+            this.name = name || 'Error';
+            if (Error.captureStackTrace) {
+                Error.captureStackTrace(this, this.constructor);
+            }
+        };
+        ctor.prototype = Object.create(Error.prototype);
+        Object.defineProperty(ctor.prototype, 'constructor', { value: ctor, writable: true, configurable: true });
+        return ctor;
+    }
+    // eslint-disable-next-line no-redeclare
+    const DOMException$1 = isDOMExceptionConstructor(NativeDOMException) ? NativeDOMException : createDOMExceptionPolyfill();
+
+    function ReadableStreamPipeTo(source, dest, preventClose, preventAbort, preventCancel, signal) {
+        const reader = AcquireReadableStreamDefaultReader(source);
+        const writer = AcquireWritableStreamDefaultWriter(dest);
+        source._disturbed = true;
+        let shuttingDown = false;
+        // This is used to keep track of the spec's requirement that we wait for ongoing writes during shutdown.
+        let currentWrite = promiseResolvedWith(undefined);
+        return newPromise((resolve, reject) => {
+            let abortAlgorithm;
+            if (signal !== undefined) {
+                abortAlgorithm = () => {
+                    const error = new DOMException$1('Aborted', 'AbortError');
+                    const actions = [];
+                    if (!preventAbort) {
+                        actions.push(() => {
+                            if (dest._state === 'writable') {
+                                return WritableStreamAbort(dest, error);
+                            }
+                            return promiseResolvedWith(undefined);
+                        });
+                    }
+                    if (!preventCancel) {
+                        actions.push(() => {
+                            if (source._state === 'readable') {
+                                return ReadableStreamCancel(source, error);
+                            }
+                            return promiseResolvedWith(undefined);
+                        });
+                    }
+                    shutdownWithAction(() => Promise.all(actions.map(action => action())), true, error);
+                };
+                if (signal.aborted) {
+                    abortAlgorithm();
+                    return;
+                }
+                signal.addEventListener('abort', abortAlgorithm);
+            }
+            // Using reader and writer, read all chunks from this and write them to dest
+            // - Backpressure must be enforced
+            // - Shutdown must stop all activity
+            function pipeLoop() {
+                return newPromise((resolveLoop, rejectLoop) => {
+                    function next(done) {
+                        if (done) {
+                            resolveLoop();
+                        }
+                        else {
+                            // Use `PerformPromiseThen` instead of `uponPromise` to avoid
+                            // adding unnecessary `.catch(rethrowAssertionErrorRejection)` handlers
+                            PerformPromiseThen(pipeStep(), next, rejectLoop);
+                        }
+                    }
+                    next(false);
+                });
+            }
+            function pipeStep() {
+                if (shuttingDown) {
+                    return promiseResolvedWith(true);
+                }
+                return PerformPromiseThen(writer._readyPromise, () => {
+                    return newPromise((resolveRead, rejectRead) => {
+                        ReadableStreamDefaultReaderRead(reader, {
+                            _chunkSteps: chunk => {
+                                currentWrite = PerformPromiseThen(WritableStreamDefaultWriterWrite(writer, chunk), undefined, noop);
+                                resolveRead(false);
+                            },
+                            _closeSteps: () => resolveRead(true),
+                            _errorSteps: rejectRead
+                        });
+                    });
+                });
+            }
+            // Errors must be propagated forward
+            isOrBecomesErrored(source, reader._closedPromise, storedError => {
+                if (!preventAbort) {
+                    shutdownWithAction(() => WritableStreamAbort(dest, storedError), true, storedError);
+                }
+                else {
+                    shutdown(true, storedError);
+                }
+            });
+            // Errors must be propagated backward
+            isOrBecomesErrored(dest, writer._closedPromise, storedError => {
+                if (!preventCancel) {
+                    shutdownWithAction(() => ReadableStreamCancel(source, storedError), true, storedError);
+                }
+                else {
+                    shutdown(true, storedError);
+                }
+            });
+            // Closing must be propagated forward
+            isOrBecomesClosed(source, reader._closedPromise, () => {
+                if (!preventClose) {
+                    shutdownWithAction(() => WritableStreamDefaultWriterCloseWithErrorPropagation(writer));
+                }
+                else {
+                    shutdown();
+                }
+            });
+            // Closing must be propagated backward
+            if (WritableStreamCloseQueuedOrInFlight(dest) || dest._state === 'closed') {
+                const destClosed = new TypeError('the destination writable stream closed before all data could be piped to it');
+                if (!preventCancel) {
+                    shutdownWithAction(() => ReadableStreamCancel(source, destClosed), true, destClosed);
+                }
+                else {
+                    shutdown(true, destClosed);
+                }
+            }
+            setPromiseIsHandledToTrue(pipeLoop());
+            function waitForWritesToFinish() {
+                // Another write may have started while we were waiting on this currentWrite, so we have to be sure to wait
+                // for that too.
+                const oldCurrentWrite = currentWrite;
+                return PerformPromiseThen(currentWrite, () => oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined);
+            }
+            function isOrBecomesErrored(stream, promise, action) {
+                if (stream._state === 'errored') {
+                    action(stream._storedError);
+                }
+                else {
+                    uponRejection(promise, action);
+                }
+            }
+            function isOrBecomesClosed(stream, promise, action) {
+                if (stream._state === 'closed') {
+                    action();
+                }
+                else {
+                    uponFulfillment(promise, action);
+                }
+            }
+            function shutdownWithAction(action, originalIsError, originalError) {
+                if (shuttingDown) {
+                    return;
+                }
+                shuttingDown = true;
+                if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {
+                    uponFulfillment(waitForWritesToFinish(), doTheRest);
+                }
+                else {
+                    doTheRest();
+                }
+                function doTheRest() {
+                    uponPromise(action(), () => finalize(originalIsError, originalError), newError => finalize(true, newError));
+                }
+            }
+            function shutdown(isError, error) {
+                if (shuttingDown) {
+                    return;
+                }
+                shuttingDown = true;
+                if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {
+                    uponFulfillment(waitForWritesToFinish(), () => finalize(isError, error));
+                }
+                else {
+                    finalize(isError, error);
+                }
+            }
+            function finalize(isError, error) {
+                WritableStreamDefaultWriterRelease(writer);
+                ReadableStreamReaderGenericRelease(reader);
+                if (signal !== undefined) {
+                    signal.removeEventListener('abort', abortAlgorithm);
+                }
+                if (isError) {
+                    reject(error);
+                }
+                else {
+                    resolve(undefined);
+                }
+            }
+        });
+    }
+
+    /**
+     * Allows control of a {@link ReadableStream | readable stream}'s state and internal queue.
+     *
+     * @public
+     */
+    class ReadableStreamDefaultController {
+        constructor() {
+            throw new TypeError('Illegal constructor');
+        }
+        /**
+         * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is
+         * over-full. An underlying source ought to use this information to determine when and how to apply backpressure.
+         */
+        get desiredSize() {
+            if (!IsReadableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$1('desiredSize');
+            }
+            return ReadableStreamDefaultControllerGetDesiredSize(this);
+        }
+        /**
+         * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from
+         * the stream, but once those are read, the stream will become closed.
+         */
+        close() {
+            if (!IsReadableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$1('close');
+            }
+            if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {
+                throw new TypeError('The stream is not in a state that permits close');
+            }
+            ReadableStreamDefaultControllerClose(this);
+        }
+        enqueue(chunk = undefined) {
+            if (!IsReadableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$1('enqueue');
+            }
+            if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {
+                throw new TypeError('The stream is not in a state that permits enqueue');
+            }
+            return ReadableStreamDefaultControllerEnqueue(this, chunk);
+        }
+        /**
+         * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.
+         */
+        error(e = undefined) {
+            if (!IsReadableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$1('error');
+            }
+            ReadableStreamDefaultControllerError(this, e);
+        }
+        /** @internal */
+        [CancelSteps](reason) {
+            ResetQueue(this);
+            const result = this._cancelAlgorithm(reason);
+            ReadableStreamDefaultControllerClearAlgorithms(this);
+            return result;
+        }
+        /** @internal */
+        [PullSteps](readRequest) {
+            const stream = this._controlledReadableStream;
+            if (this._queue.length > 0) {
+                const chunk = DequeueValue(this);
+                if (this._closeRequested && this._queue.length === 0) {
+                    ReadableStreamDefaultControllerClearAlgorithms(this);
+                    ReadableStreamClose(stream);
+                }
+                else {
+                    ReadableStreamDefaultControllerCallPullIfNeeded(this);
+                }
+                readRequest._chunkSteps(chunk);
+            }
+            else {
+                ReadableStreamAddReadRequest(stream, readRequest);
+                ReadableStreamDefaultControllerCallPullIfNeeded(this);
+            }
+        }
+    }
+    Object.defineProperties(ReadableStreamDefaultController.prototype, {
+        close: { enumerable: true },
+        enqueue: { enumerable: true },
+        error: { enumerable: true },
+        desiredSize: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableStreamDefaultController',
+            configurable: true
+        });
+    }
+    // Abstract operations for the ReadableStreamDefaultController.
+    function IsReadableStreamDefaultController(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableStream')) {
+            return false;
+        }
+        return x instanceof ReadableStreamDefaultController;
+    }
+    function ReadableStreamDefaultControllerCallPullIfNeeded(controller) {
+        const shouldPull = ReadableStreamDefaultControllerShouldCallPull(controller);
+        if (!shouldPull) {
+            return;
+        }
+        if (controller._pulling) {
+            controller._pullAgain = true;
+            return;
+        }
+        controller._pulling = true;
+        const pullPromise = controller._pullAlgorithm();
+        uponPromise(pullPromise, () => {
+            controller._pulling = false;
+            if (controller._pullAgain) {
+                controller._pullAgain = false;
+                ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+            }
+        }, e => {
+            ReadableStreamDefaultControllerError(controller, e);
+        });
+    }
+    function ReadableStreamDefaultControllerShouldCallPull(controller) {
+        const stream = controller._controlledReadableStream;
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+            return false;
+        }
+        if (!controller._started) {
+            return false;
+        }
+        if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+            return true;
+        }
+        const desiredSize = ReadableStreamDefaultControllerGetDesiredSize(controller);
+        if (desiredSize > 0) {
+            return true;
+        }
+        return false;
+    }
+    function ReadableStreamDefaultControllerClearAlgorithms(controller) {
+        controller._pullAlgorithm = undefined;
+        controller._cancelAlgorithm = undefined;
+        controller._strategySizeAlgorithm = undefined;
+    }
+    // A client of ReadableStreamDefaultController may use these functions directly to bypass state check.
+    function ReadableStreamDefaultControllerClose(controller) {
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+            return;
+        }
+        const stream = controller._controlledReadableStream;
+        controller._closeRequested = true;
+        if (controller._queue.length === 0) {
+            ReadableStreamDefaultControllerClearAlgorithms(controller);
+            ReadableStreamClose(stream);
+        }
+    }
+    function ReadableStreamDefaultControllerEnqueue(controller, chunk) {
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+            return;
+        }
+        const stream = controller._controlledReadableStream;
+        if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+            ReadableStreamFulfillReadRequest(stream, chunk, false);
+        }
+        else {
+            let chunkSize;
+            try {
+                chunkSize = controller._strategySizeAlgorithm(chunk);
+            }
+            catch (chunkSizeE) {
+                ReadableStreamDefaultControllerError(controller, chunkSizeE);
+                throw chunkSizeE;
+            }
+            try {
+                EnqueueValueWithSize(controller, chunk, chunkSize);
+            }
+            catch (enqueueE) {
+                ReadableStreamDefaultControllerError(controller, enqueueE);
+                throw enqueueE;
+            }
+        }
+        ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+    }
+    function ReadableStreamDefaultControllerError(controller, e) {
+        const stream = controller._controlledReadableStream;
+        if (stream._state !== 'readable') {
+            return;
+        }
+        ResetQueue(controller);
+        ReadableStreamDefaultControllerClearAlgorithms(controller);
+        ReadableStreamError(stream, e);
+    }
+    function ReadableStreamDefaultControllerGetDesiredSize(controller) {
+        const state = controller._controlledReadableStream._state;
+        if (state === 'errored') {
+            return null;
+        }
+        if (state === 'closed') {
+            return 0;
+        }
+        return controller._strategyHWM - controller._queueTotalSize;
+    }
+    // This is used in the implementation of TransformStream.
+    function ReadableStreamDefaultControllerHasBackpressure(controller) {
+        if (ReadableStreamDefaultControllerShouldCallPull(controller)) {
+            return false;
+        }
+        return true;
+    }
+    function ReadableStreamDefaultControllerCanCloseOrEnqueue(controller) {
+        const state = controller._controlledReadableStream._state;
+        if (!controller._closeRequested && state === 'readable') {
+            return true;
+        }
+        return false;
+    }
+    function SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm) {
+        controller._controlledReadableStream = stream;
+        controller._queue = undefined;
+        controller._queueTotalSize = undefined;
+        ResetQueue(controller);
+        controller._started = false;
+        controller._closeRequested = false;
+        controller._pullAgain = false;
+        controller._pulling = false;
+        controller._strategySizeAlgorithm = sizeAlgorithm;
+        controller._strategyHWM = highWaterMark;
+        controller._pullAlgorithm = pullAlgorithm;
+        controller._cancelAlgorithm = cancelAlgorithm;
+        stream._readableStreamController = controller;
+        const startResult = startAlgorithm();
+        uponPromise(promiseResolvedWith(startResult), () => {
+            controller._started = true;
+            ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+        }, r => {
+            ReadableStreamDefaultControllerError(controller, r);
+        });
+    }
+    function SetUpReadableStreamDefaultControllerFromUnderlyingSource(stream, underlyingSource, highWaterMark, sizeAlgorithm) {
+        const controller = Object.create(ReadableStreamDefaultController.prototype);
+        let startAlgorithm = () => undefined;
+        let pullAlgorithm = () => promiseResolvedWith(undefined);
+        let cancelAlgorithm = () => promiseResolvedWith(undefined);
+        if (underlyingSource.start !== undefined) {
+            startAlgorithm = () => underlyingSource.start(controller);
+        }
+        if (underlyingSource.pull !== undefined) {
+            pullAlgorithm = () => underlyingSource.pull(controller);
+        }
+        if (underlyingSource.cancel !== undefined) {
+            cancelAlgorithm = reason => underlyingSource.cancel(reason);
+        }
+        SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm);
+    }
+    // Helper functions for the ReadableStreamDefaultController.
+    function defaultControllerBrandCheckException$1(name) {
+        return new TypeError(`ReadableStreamDefaultController.prototype.${name} can only be used on a ReadableStreamDefaultController`);
+    }
+
+    function ReadableStreamTee(stream, cloneForBranch2) {
+        if (IsReadableByteStreamController(stream._readableStreamController)) {
+            return ReadableByteStreamTee(stream);
+        }
+        return ReadableStreamDefaultTee(stream);
+    }
+    function ReadableStreamDefaultTee(stream, cloneForBranch2) {
+        const reader = AcquireReadableStreamDefaultReader(stream);
+        let reading = false;
+        let readAgain = false;
+        let canceled1 = false;
+        let canceled2 = false;
+        let reason1;
+        let reason2;
+        let branch1;
+        let branch2;
+        let resolveCancelPromise;
+        const cancelPromise = newPromise(resolve => {
+            resolveCancelPromise = resolve;
+        });
+        function pullAlgorithm() {
+            if (reading) {
+                readAgain = true;
+                return promiseResolvedWith(undefined);
+            }
+            reading = true;
+            const readRequest = {
+                _chunkSteps: chunk => {
+                    // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                    // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                    // successful synchronously-available reads get ahead of asynchronously-available errors.
+                    queueMicrotask(() => {
+                        readAgain = false;
+                        const chunk1 = chunk;
+                        const chunk2 = chunk;
+                        // There is no way to access the cloning code right now in the reference implementation.
+                        // If we add one then we'll need an implementation for serializable objects.
+                        // if (!canceled2 && cloneForBranch2) {
+                        //   chunk2 = StructuredDeserialize(StructuredSerialize(chunk2));
+                        // }
+                        if (!canceled1) {
+                            ReadableStreamDefaultControllerEnqueue(branch1._readableStreamController, chunk1);
+                        }
+                        if (!canceled2) {
+                            ReadableStreamDefaultControllerEnqueue(branch2._readableStreamController, chunk2);
+                        }
+                        reading = false;
+                        if (readAgain) {
+                            pullAlgorithm();
+                        }
+                    });
+                },
+                _closeSteps: () => {
+                    reading = false;
+                    if (!canceled1) {
+                        ReadableStreamDefaultControllerClose(branch1._readableStreamController);
+                    }
+                    if (!canceled2) {
+                        ReadableStreamDefaultControllerClose(branch2._readableStreamController);
+                    }
+                    if (!canceled1 || !canceled2) {
+                        resolveCancelPromise(undefined);
+                    }
+                },
+                _errorSteps: () => {
+                    reading = false;
+                }
+            };
+            ReadableStreamDefaultReaderRead(reader, readRequest);
+            return promiseResolvedWith(undefined);
+        }
+        function cancel1Algorithm(reason) {
+            canceled1 = true;
+            reason1 = reason;
+            if (canceled2) {
+                const compositeReason = CreateArrayFromList([reason1, reason2]);
+                const cancelResult = ReadableStreamCancel(stream, compositeReason);
+                resolveCancelPromise(cancelResult);
+            }
+            return cancelPromise;
+        }
+        function cancel2Algorithm(reason) {
+            canceled2 = true;
+            reason2 = reason;
+            if (canceled1) {
+                const compositeReason = CreateArrayFromList([reason1, reason2]);
+                const cancelResult = ReadableStreamCancel(stream, compositeReason);
+                resolveCancelPromise(cancelResult);
+            }
+            return cancelPromise;
+        }
+        function startAlgorithm() {
+            // do nothing
+        }
+        branch1 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel1Algorithm);
+        branch2 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel2Algorithm);
+        uponRejection(reader._closedPromise, (r) => {
+            ReadableStreamDefaultControllerError(branch1._readableStreamController, r);
+            ReadableStreamDefaultControllerError(branch2._readableStreamController, r);
+            if (!canceled1 || !canceled2) {
+                resolveCancelPromise(undefined);
+            }
+        });
+        return [branch1, branch2];
+    }
+    function ReadableByteStreamTee(stream) {
+        let reader = AcquireReadableStreamDefaultReader(stream);
+        let reading = false;
+        let readAgainForBranch1 = false;
+        let readAgainForBranch2 = false;
+        let canceled1 = false;
+        let canceled2 = false;
+        let reason1;
+        let reason2;
+        let branch1;
+        let branch2;
+        let resolveCancelPromise;
+        const cancelPromise = newPromise(resolve => {
+            resolveCancelPromise = resolve;
+        });
+        function forwardReaderError(thisReader) {
+            uponRejection(thisReader._closedPromise, r => {
+                if (thisReader !== reader) {
+                    return;
+                }
+                ReadableByteStreamControllerError(branch1._readableStreamController, r);
+                ReadableByteStreamControllerError(branch2._readableStreamController, r);
+                if (!canceled1 || !canceled2) {
+                    resolveCancelPromise(undefined);
+                }
+            });
+        }
+        function pullWithDefaultReader() {
+            if (IsReadableStreamBYOBReader(reader)) {
+                ReadableStreamReaderGenericRelease(reader);
+                reader = AcquireReadableStreamDefaultReader(stream);
+                forwardReaderError(reader);
+            }
+            const readRequest = {
+                _chunkSteps: chunk => {
+                    // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                    // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                    // successful synchronously-available reads get ahead of asynchronously-available errors.
+                    queueMicrotask(() => {
+                        readAgainForBranch1 = false;
+                        readAgainForBranch2 = false;
+                        const chunk1 = chunk;
+                        let chunk2 = chunk;
+                        if (!canceled1 && !canceled2) {
+                            try {
+                                chunk2 = CloneAsUint8Array(chunk);
+                            }
+                            catch (cloneE) {
+                                ReadableByteStreamControllerError(branch1._readableStreamController, cloneE);
+                                ReadableByteStreamControllerError(branch2._readableStreamController, cloneE);
+                                resolveCancelPromise(ReadableStreamCancel(stream, cloneE));
+                                return;
+                            }
+                        }
+                        if (!canceled1) {
+                            ReadableByteStreamControllerEnqueue(branch1._readableStreamController, chunk1);
+                        }
+                        if (!canceled2) {
+                            ReadableByteStreamControllerEnqueue(branch2._readableStreamController, chunk2);
+                        }
+                        reading = false;
+                        if (readAgainForBranch1) {
+                            pull1Algorithm();
+                        }
+                        else if (readAgainForBranch2) {
+                            pull2Algorithm();
+                        }
+                    });
+                },
+                _closeSteps: () => {
+                    reading = false;
+                    if (!canceled1) {
+                        ReadableByteStreamControllerClose(branch1._readableStreamController);
+                    }
+                    if (!canceled2) {
+                        ReadableByteStreamControllerClose(branch2._readableStreamController);
+                    }
+                    if (branch1._readableStreamController._pendingPullIntos.length > 0) {
+                        ReadableByteStreamControllerRespond(branch1._readableStreamController, 0);
+                    }
+                    if (branch2._readableStreamController._pendingPullIntos.length > 0) {
+                        ReadableByteStreamControllerRespond(branch2._readableStreamController, 0);
+                    }
+                    if (!canceled1 || !canceled2) {
+                        resolveCancelPromise(undefined);
+                    }
+                },
+                _errorSteps: () => {
+                    reading = false;
+                }
+            };
+            ReadableStreamDefaultReaderRead(reader, readRequest);
+        }
+        function pullWithBYOBReader(view, forBranch2) {
+            if (IsReadableStreamDefaultReader(reader)) {
+                ReadableStreamReaderGenericRelease(reader);
+                reader = AcquireReadableStreamBYOBReader(stream);
+                forwardReaderError(reader);
+            }
+            const byobBranch = forBranch2 ? branch2 : branch1;
+            const otherBranch = forBranch2 ? branch1 : branch2;
+            const readIntoRequest = {
+                _chunkSteps: chunk => {
+                    // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                    // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                    // successful synchronously-available reads get ahead of asynchronously-available errors.
+                    queueMicrotask(() => {
+                        readAgainForBranch1 = false;
+                        readAgainForBranch2 = false;
+                        const byobCanceled = forBranch2 ? canceled2 : canceled1;
+                        const otherCanceled = forBranch2 ? canceled1 : canceled2;
+                        if (!otherCanceled) {
+                            let clonedChunk;
+                            try {
+                                clonedChunk = CloneAsUint8Array(chunk);
+                            }
+                            catch (cloneE) {
+                                ReadableByteStreamControllerError(byobBranch._readableStreamController, cloneE);
+                                ReadableByteStreamControllerError(otherBranch._readableStreamController, cloneE);
+                                resolveCancelPromise(ReadableStreamCancel(stream, cloneE));
+                                return;
+                            }
+                            if (!byobCanceled) {
+                                ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                            }
+                            ReadableByteStreamControllerEnqueue(otherBranch._readableStreamController, clonedChunk);
+                        }
+                        else if (!byobCanceled) {
+                            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                        }
+                        reading = false;
+                        if (readAgainForBranch1) {
+                            pull1Algorithm();
+                        }
+                        else if (readAgainForBranch2) {
+                            pull2Algorithm();
+                        }
+                    });
+                },
+                _closeSteps: chunk => {
+                    reading = false;
+                    const byobCanceled = forBranch2 ? canceled2 : canceled1;
+                    const otherCanceled = forBranch2 ? canceled1 : canceled2;
+                    if (!byobCanceled) {
+                        ReadableByteStreamControllerClose(byobBranch._readableStreamController);
+                    }
+                    if (!otherCanceled) {
+                        ReadableByteStreamControllerClose(otherBranch._readableStreamController);
+                    }
+                    if (chunk !== undefined) {
+                        if (!byobCanceled) {
+                            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                        }
+                        if (!otherCanceled && otherBranch._readableStreamController._pendingPullIntos.length > 0) {
+                            ReadableByteStreamControllerRespond(otherBranch._readableStreamController, 0);
+                        }
+                    }
+                    if (!byobCanceled || !otherCanceled) {
+                        resolveCancelPromise(undefined);
+                    }
+                },
+                _errorSteps: () => {
+                    reading = false;
+                }
+            };
+            ReadableStreamBYOBReaderRead(reader, view, readIntoRequest);
+        }
+        function pull1Algorithm() {
+            if (reading) {
+                readAgainForBranch1 = true;
+                return promiseResolvedWith(undefined);
+            }
+            reading = true;
+            const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch1._readableStreamController);
+            if (byobRequest === null) {
+                pullWithDefaultReader();
+            }
+            else {
+                pullWithBYOBReader(byobRequest._view, false);
+            }
+            return promiseResolvedWith(undefined);
+        }
+        function pull2Algorithm() {
+            if (reading) {
+                readAgainForBranch2 = true;
+                return promiseResolvedWith(undefined);
+            }
+            reading = true;
+            const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch2._readableStreamController);
+            if (byobRequest === null) {
+                pullWithDefaultReader();
+            }
+            else {
+                pullWithBYOBReader(byobRequest._view, true);
+            }
+            return promiseResolvedWith(undefined);
+        }
+        function cancel1Algorithm(reason) {
+            canceled1 = true;
+            reason1 = reason;
+            if (canceled2) {
+                const compositeReason = CreateArrayFromList([reason1, reason2]);
+                const cancelResult = ReadableStreamCancel(stream, compositeReason);
+                resolveCancelPromise(cancelResult);
+            }
+            return cancelPromise;
+        }
+        function cancel2Algorithm(reason) {
+            canceled2 = true;
+            reason2 = reason;
+            if (canceled1) {
+                const compositeReason = CreateArrayFromList([reason1, reason2]);
+                const cancelResult = ReadableStreamCancel(stream, compositeReason);
+                resolveCancelPromise(cancelResult);
+            }
+            return cancelPromise;
+        }
+        function startAlgorithm() {
+            return;
+        }
+        branch1 = CreateReadableByteStream(startAlgorithm, pull1Algorithm, cancel1Algorithm);
+        branch2 = CreateReadableByteStream(startAlgorithm, pull2Algorithm, cancel2Algorithm);
+        forwardReaderError(reader);
+        return [branch1, branch2];
+    }
+
+    function convertUnderlyingDefaultOrByteSource(source, context) {
+        assertDictionary(source, context);
+        const original = source;
+        const autoAllocateChunkSize = original === null || original === void 0 ? void 0 : original.autoAllocateChunkSize;
+        const cancel = original === null || original === void 0 ? void 0 : original.cancel;
+        const pull = original === null || original === void 0 ? void 0 : original.pull;
+        const start = original === null || original === void 0 ? void 0 : original.start;
+        const type = original === null || original === void 0 ? void 0 : original.type;
+        return {
+            autoAllocateChunkSize: autoAllocateChunkSize === undefined ?
+                undefined :
+                convertUnsignedLongLongWithEnforceRange(autoAllocateChunkSize, `${context} has member 'autoAllocateChunkSize' that`),
+            cancel: cancel === undefined ?
+                undefined :
+                convertUnderlyingSourceCancelCallback(cancel, original, `${context} has member 'cancel' that`),
+            pull: pull === undefined ?
+                undefined :
+                convertUnderlyingSourcePullCallback(pull, original, `${context} has member 'pull' that`),
+            start: start === undefined ?
+                undefined :
+                convertUnderlyingSourceStartCallback(start, original, `${context} has member 'start' that`),
+            type: type === undefined ? undefined : convertReadableStreamType(type, `${context} has member 'type' that`)
+        };
+    }
+    function convertUnderlyingSourceCancelCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (reason) => promiseCall(fn, original, [reason]);
+    }
+    function convertUnderlyingSourcePullCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (controller) => promiseCall(fn, original, [controller]);
+    }
+    function convertUnderlyingSourceStartCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (controller) => reflectCall(fn, original, [controller]);
+    }
+    function convertReadableStreamType(type, context) {
+        type = `${type}`;
+        if (type !== 'bytes') {
+            throw new TypeError(`${context} '${type}' is not a valid enumeration value for ReadableStreamType`);
+        }
+        return type;
+    }
+
+    function convertReaderOptions(options, context) {
+        assertDictionary(options, context);
+        const mode = options === null || options === void 0 ? void 0 : options.mode;
+        return {
+            mode: mode === undefined ? undefined : convertReadableStreamReaderMode(mode, `${context} has member 'mode' that`)
+        };
+    }
+    function convertReadableStreamReaderMode(mode, context) {
+        mode = `${mode}`;
+        if (mode !== 'byob') {
+            throw new TypeError(`${context} '${mode}' is not a valid enumeration value for ReadableStreamReaderMode`);
+        }
+        return mode;
+    }
+
+    function convertIteratorOptions(options, context) {
+        assertDictionary(options, context);
+        const preventCancel = options === null || options === void 0 ? void 0 : options.preventCancel;
+        return { preventCancel: Boolean(preventCancel) };
+    }
+
+    function convertPipeOptions(options, context) {
+        assertDictionary(options, context);
+        const preventAbort = options === null || options === void 0 ? void 0 : options.preventAbort;
+        const preventCancel = options === null || options === void 0 ? void 0 : options.preventCancel;
+        const preventClose = options === null || options === void 0 ? void 0 : options.preventClose;
+        const signal = options === null || options === void 0 ? void 0 : options.signal;
+        if (signal !== undefined) {
+            assertAbortSignal(signal, `${context} has member 'signal' that`);
+        }
+        return {
+            preventAbort: Boolean(preventAbort),
+            preventCancel: Boolean(preventCancel),
+            preventClose: Boolean(preventClose),
+            signal
+        };
+    }
+    function assertAbortSignal(signal, context) {
+        if (!isAbortSignal(signal)) {
+            throw new TypeError(`${context} is not an AbortSignal.`);
+        }
+    }
+
+    function convertReadableWritablePair(pair, context) {
+        assertDictionary(pair, context);
+        const readable = pair === null || pair === void 0 ? void 0 : pair.readable;
+        assertRequiredField(readable, 'readable', 'ReadableWritablePair');
+        assertReadableStream(readable, `${context} has member 'readable' that`);
+        const writable = pair === null || pair === void 0 ? void 0 : pair.writable;
+        assertRequiredField(writable, 'writable', 'ReadableWritablePair');
+        assertWritableStream(writable, `${context} has member 'writable' that`);
+        return { readable, writable };
+    }
+
+    /**
+     * A readable stream represents a source of data, from which you can read.
+     *
+     * @public
+     */
+    class ReadableStream {
+        constructor(rawUnderlyingSource = {}, rawStrategy = {}) {
+            if (rawUnderlyingSource === undefined) {
+                rawUnderlyingSource = null;
+            }
+            else {
+                assertObject(rawUnderlyingSource, 'First parameter');
+            }
+            const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');
+            const underlyingSource = convertUnderlyingDefaultOrByteSource(rawUnderlyingSource, 'First parameter');
+            InitializeReadableStream(this);
+            if (underlyingSource.type === 'bytes') {
+                if (strategy.size !== undefined) {
+                    throw new RangeError('The strategy for a byte stream cannot have a size function');
+                }
+                const highWaterMark = ExtractHighWaterMark(strategy, 0);
+                SetUpReadableByteStreamControllerFromUnderlyingSource(this, underlyingSource, highWaterMark);
+            }
+            else {
+                const sizeAlgorithm = ExtractSizeAlgorithm(strategy);
+                const highWaterMark = ExtractHighWaterMark(strategy, 1);
+                SetUpReadableStreamDefaultControllerFromUnderlyingSource(this, underlyingSource, highWaterMark, sizeAlgorithm);
+            }
+        }
+        /**
+         * Whether or not the readable stream is locked to a {@link ReadableStreamDefaultReader | reader}.
+         */
+        get locked() {
+            if (!IsReadableStream(this)) {
+                throw streamBrandCheckException$1('locked');
+            }
+            return IsReadableStreamLocked(this);
+        }
+        /**
+         * Cancels the stream, signaling a loss of interest in the stream by a consumer.
+         *
+         * The supplied `reason` argument will be given to the underlying source's {@link UnderlyingSource.cancel | cancel()}
+         * method, which might or might not use it.
+         */
+        cancel(reason = undefined) {
+            if (!IsReadableStream(this)) {
+                return promiseRejectedWith(streamBrandCheckException$1('cancel'));
+            }
+            if (IsReadableStreamLocked(this)) {
+                return promiseRejectedWith(new TypeError('Cannot cancel a stream that already has a reader'));
+            }
+            return ReadableStreamCancel(this, reason);
+        }
+        getReader(rawOptions = undefined) {
+            if (!IsReadableStream(this)) {
+                throw streamBrandCheckException$1('getReader');
+            }
+            const options = convertReaderOptions(rawOptions, 'First parameter');
+            if (options.mode === undefined) {
+                return AcquireReadableStreamDefaultReader(this);
+            }
+            return AcquireReadableStreamBYOBReader(this);
+        }
+        pipeThrough(rawTransform, rawOptions = {}) {
+            if (!IsReadableStream(this)) {
+                throw streamBrandCheckException$1('pipeThrough');
+            }
+            assertRequiredArgument(rawTransform, 1, 'pipeThrough');
+            const transform = convertReadableWritablePair(rawTransform, 'First parameter');
+            const options = convertPipeOptions(rawOptions, 'Second parameter');
+            if (IsReadableStreamLocked(this)) {
+                throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked ReadableStream');
+            }
+            if (IsWritableStreamLocked(transform.writable)) {
+                throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked WritableStream');
+            }
+            const promise = ReadableStreamPipeTo(this, transform.writable, options.preventClose, options.preventAbort, options.preventCancel, options.signal);
+            setPromiseIsHandledToTrue(promise);
+            return transform.readable;
+        }
+        pipeTo(destination, rawOptions = {}) {
+            if (!IsReadableStream(this)) {
+                return promiseRejectedWith(streamBrandCheckException$1('pipeTo'));
+            }
+            if (destination === undefined) {
+                return promiseRejectedWith(`Parameter 1 is required in 'pipeTo'.`);
+            }
+            if (!IsWritableStream(destination)) {
+                return promiseRejectedWith(new TypeError(`ReadableStream.prototype.pipeTo's first argument must be a WritableStream`));
+            }
+            let options;
+            try {
+                options = convertPipeOptions(rawOptions, 'Second parameter');
+            }
+            catch (e) {
+                return promiseRejectedWith(e);
+            }
+            if (IsReadableStreamLocked(this)) {
+                return promiseRejectedWith(new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream'));
+            }
+            if (IsWritableStreamLocked(destination)) {
+                return promiseRejectedWith(new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream'));
+            }
+            return ReadableStreamPipeTo(this, destination, options.preventClose, options.preventAbort, options.preventCancel, options.signal);
+        }
+        /**
+         * Tees this readable stream, returning a two-element array containing the two resulting branches as
+         * new {@link ReadableStream} instances.
+         *
+         * Teeing a stream will lock it, preventing any other consumer from acquiring a reader.
+         * To cancel the stream, cancel both of the resulting branches; a composite cancellation reason will then be
+         * propagated to the stream's underlying source.
+         *
+         * Note that the chunks seen in each branch will be the same object. If the chunks are not immutable,
+         * this could allow interference between the two branches.
+         */
+        tee() {
+            if (!IsReadableStream(this)) {
+                throw streamBrandCheckException$1('tee');
+            }
+            const branches = ReadableStreamTee(this);
+            return CreateArrayFromList(branches);
+        }
+        values(rawOptions = undefined) {
+            if (!IsReadableStream(this)) {
+                throw streamBrandCheckException$1('values');
+            }
+            const options = convertIteratorOptions(rawOptions, 'First parameter');
+            return AcquireReadableStreamAsyncIterator(this, options.preventCancel);
+        }
+    }
+    Object.defineProperties(ReadableStream.prototype, {
+        cancel: { enumerable: true },
+        getReader: { enumerable: true },
+        pipeThrough: { enumerable: true },
+        pipeTo: { enumerable: true },
+        tee: { enumerable: true },
+        values: { enumerable: true },
+        locked: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableStream.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableStream',
+            configurable: true
+        });
+    }
+    if (typeof SymbolPolyfill.asyncIterator === 'symbol') {
+        Object.defineProperty(ReadableStream.prototype, SymbolPolyfill.asyncIterator, {
+            value: ReadableStream.prototype.values,
+            writable: true,
+            configurable: true
+        });
+    }
+    // Abstract operations for the ReadableStream.
+    // Throws if and only if startAlgorithm throws.
+    function CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark = 1, sizeAlgorithm = () => 1) {
+        const stream = Object.create(ReadableStream.prototype);
+        InitializeReadableStream(stream);
+        const controller = Object.create(ReadableStreamDefaultController.prototype);
+        SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm);
+        return stream;
+    }
+    // Throws if and only if startAlgorithm throws.
+    function CreateReadableByteStream(startAlgorithm, pullAlgorithm, cancelAlgorithm) {
+        const stream = Object.create(ReadableStream.prototype);
+        InitializeReadableStream(stream);
+        const controller = Object.create(ReadableByteStreamController.prototype);
+        SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, 0, undefined);
+        return stream;
+    }
+    function InitializeReadableStream(stream) {
+        stream._state = 'readable';
+        stream._reader = undefined;
+        stream._storedError = undefined;
+        stream._disturbed = false;
+    }
+    function IsReadableStream(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_readableStreamController')) {
+            return false;
+        }
+        return x instanceof ReadableStream;
+    }
+    function IsReadableStreamLocked(stream) {
+        if (stream._reader === undefined) {
+            return false;
+        }
+        return true;
+    }
+    // ReadableStream API exposed for controllers.
+    function ReadableStreamCancel(stream, reason) {
+        stream._disturbed = true;
+        if (stream._state === 'closed') {
+            return promiseResolvedWith(undefined);
+        }
+        if (stream._state === 'errored') {
+            return promiseRejectedWith(stream._storedError);
+        }
+        ReadableStreamClose(stream);
+        const reader = stream._reader;
+        if (reader !== undefined && IsReadableStreamBYOBReader(reader)) {
+            reader._readIntoRequests.forEach(readIntoRequest => {
+                readIntoRequest._closeSteps(undefined);
+            });
+            reader._readIntoRequests = new SimpleQueue();
+        }
+        const sourceCancelPromise = stream._readableStreamController[CancelSteps](reason);
+        return transformPromiseWith(sourceCancelPromise, noop);
+    }
+    function ReadableStreamClose(stream) {
+        stream._state = 'closed';
+        const reader = stream._reader;
+        if (reader === undefined) {
+            return;
+        }
+        defaultReaderClosedPromiseResolve(reader);
+        if (IsReadableStreamDefaultReader(reader)) {
+            reader._readRequests.forEach(readRequest => {
+                readRequest._closeSteps();
+            });
+            reader._readRequests = new SimpleQueue();
+        }
+    }
+    function ReadableStreamError(stream, e) {
+        stream._state = 'errored';
+        stream._storedError = e;
+        const reader = stream._reader;
+        if (reader === undefined) {
+            return;
+        }
+        defaultReaderClosedPromiseReject(reader, e);
+        if (IsReadableStreamDefaultReader(reader)) {
+            reader._readRequests.forEach(readRequest => {
+                readRequest._errorSteps(e);
+            });
+            reader._readRequests = new SimpleQueue();
+        }
+        else {
+            reader._readIntoRequests.forEach(readIntoRequest => {
+                readIntoRequest._errorSteps(e);
+            });
+            reader._readIntoRequests = new SimpleQueue();
+        }
+    }
+    // Helper functions for the ReadableStream.
+    function streamBrandCheckException$1(name) {
+        return new TypeError(`ReadableStream.prototype.${name} can only be used on a ReadableStream`);
+    }
+
+    function convertQueuingStrategyInit(init, context) {
+        assertDictionary(init, context);
+        const highWaterMark = init === null || init === void 0 ? void 0 : init.highWaterMark;
+        assertRequiredField(highWaterMark, 'highWaterMark', 'QueuingStrategyInit');
+        return {
+            highWaterMark: convertUnrestrictedDouble(highWaterMark)
+        };
+    }
+
+    // The size function must not have a prototype property nor be a constructor
+    const byteLengthSizeFunction = (chunk) => {
+        return chunk.byteLength;
+    };
+    try {
+        Object.defineProperty(byteLengthSizeFunction, 'name', {
+            value: 'size',
+            configurable: true
+        });
+    }
+    catch (_a) {
+        // This property is non-configurable in older browsers, so ignore if this throws.
+        // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility
+    }
+    /**
+     * A queuing strategy that counts the number of bytes in each chunk.
+     *
+     * @public
+     */
+    class ByteLengthQueuingStrategy {
+        constructor(options) {
+            assertRequiredArgument(options, 1, 'ByteLengthQueuingStrategy');
+            options = convertQueuingStrategyInit(options, 'First parameter');
+            this._byteLengthQueuingStrategyHighWaterMark = options.highWaterMark;
+        }
+        /**
+         * Returns the high water mark provided to the constructor.
+         */
+        get highWaterMark() {
+            if (!IsByteLengthQueuingStrategy(this)) {
+                throw byteLengthBrandCheckException('highWaterMark');
+            }
+            return this._byteLengthQueuingStrategyHighWaterMark;
+        }
+        /**
+         * Measures the size of `chunk` by returning the value of its `byteLength` property.
+         */
+        get size() {
+            if (!IsByteLengthQueuingStrategy(this)) {
+                throw byteLengthBrandCheckException('size');
+            }
+            return byteLengthSizeFunction;
+        }
+    }
+    Object.defineProperties(ByteLengthQueuingStrategy.prototype, {
+        highWaterMark: { enumerable: true },
+        size: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ByteLengthQueuingStrategy.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ByteLengthQueuingStrategy',
+            configurable: true
+        });
+    }
+    // Helper functions for the ByteLengthQueuingStrategy.
+    function byteLengthBrandCheckException(name) {
+        return new TypeError(`ByteLengthQueuingStrategy.prototype.${name} can only be used on a ByteLengthQueuingStrategy`);
+    }
+    function IsByteLengthQueuingStrategy(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_byteLengthQueuingStrategyHighWaterMark')) {
+            return false;
+        }
+        return x instanceof ByteLengthQueuingStrategy;
+    }
+
+    // The size function must not have a prototype property nor be a constructor
+    const countSizeFunction = () => {
+        return 1;
+    };
+    try {
+        Object.defineProperty(countSizeFunction, 'name', {
+            value: 'size',
+            configurable: true
+        });
+    }
+    catch (_a) {
+        // This property is non-configurable in older browsers, so ignore if this throws.
+        // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility
+    }
+    /**
+     * A queuing strategy that counts the number of chunks.
+     *
+     * @public
+     */
+    class CountQueuingStrategy {
+        constructor(options) {
+            assertRequiredArgument(options, 1, 'CountQueuingStrategy');
+            options = convertQueuingStrategyInit(options, 'First parameter');
+            this._countQueuingStrategyHighWaterMark = options.highWaterMark;
+        }
+        /**
+         * Returns the high water mark provided to the constructor.
+         */
+        get highWaterMark() {
+            if (!IsCountQueuingStrategy(this)) {
+                throw countBrandCheckException('highWaterMark');
+            }
+            return this._countQueuingStrategyHighWaterMark;
+        }
+        /**
+         * Measures the size of `chunk` by always returning 1.
+         * This ensures that the total queue size is a count of the number of chunks in the queue.
+         */
+        get size() {
+            if (!IsCountQueuingStrategy(this)) {
+                throw countBrandCheckException('size');
+            }
+            return countSizeFunction;
+        }
+    }
+    Object.defineProperties(CountQueuingStrategy.prototype, {
+        highWaterMark: { enumerable: true },
+        size: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(CountQueuingStrategy.prototype, SymbolPolyfill.toStringTag, {
+            value: 'CountQueuingStrategy',
+            configurable: true
+        });
+    }
+    // Helper functions for the CountQueuingStrategy.
+    function countBrandCheckException(name) {
+        return new TypeError(`CountQueuingStrategy.prototype.${name} can only be used on a CountQueuingStrategy`);
+    }
+    function IsCountQueuingStrategy(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_countQueuingStrategyHighWaterMark')) {
+            return false;
+        }
+        return x instanceof CountQueuingStrategy;
+    }
+
+    function convertTransformer(original, context) {
+        assertDictionary(original, context);
+        const flush = original === null || original === void 0 ? void 0 : original.flush;
+        const readableType = original === null || original === void 0 ? void 0 : original.readableType;
+        const start = original === null || original === void 0 ? void 0 : original.start;
+        const transform = original === null || original === void 0 ? void 0 : original.transform;
+        const writableType = original === null || original === void 0 ? void 0 : original.writableType;
+        return {
+            flush: flush === undefined ?
+                undefined :
+                convertTransformerFlushCallback(flush, original, `${context} has member 'flush' that`),
+            readableType,
+            start: start === undefined ?
+                undefined :
+                convertTransformerStartCallback(start, original, `${context} has member 'start' that`),
+            transform: transform === undefined ?
+                undefined :
+                convertTransformerTransformCallback(transform, original, `${context} has member 'transform' that`),
+            writableType
+        };
+    }
+    function convertTransformerFlushCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (controller) => promiseCall(fn, original, [controller]);
+    }
+    function convertTransformerStartCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (controller) => reflectCall(fn, original, [controller]);
+    }
+    function convertTransformerTransformCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return (chunk, controller) => promiseCall(fn, original, [chunk, controller]);
+    }
+
+    // Class TransformStream
+    /**
+     * A transform stream consists of a pair of streams: a {@link WritableStream | writable stream},
+     * known as its writable side, and a {@link ReadableStream | readable stream}, known as its readable side.
+     * In a manner specific to the transform stream in question, writes to the writable side result in new data being
+     * made available for reading from the readable side.
+     *
+     * @public
+     */
+    class TransformStream {
+        constructor(rawTransformer = {}, rawWritableStrategy = {}, rawReadableStrategy = {}) {
+            if (rawTransformer === undefined) {
+                rawTransformer = null;
+            }
+            const writableStrategy = convertQueuingStrategy(rawWritableStrategy, 'Second parameter');
+            const readableStrategy = convertQueuingStrategy(rawReadableStrategy, 'Third parameter');
+            const transformer = convertTransformer(rawTransformer, 'First parameter');
+            if (transformer.readableType !== undefined) {
+                throw new RangeError('Invalid readableType specified');
+            }
+            if (transformer.writableType !== undefined) {
+                throw new RangeError('Invalid writableType specified');
+            }
+            const readableHighWaterMark = ExtractHighWaterMark(readableStrategy, 0);
+            const readableSizeAlgorithm = ExtractSizeAlgorithm(readableStrategy);
+            const writableHighWaterMark = ExtractHighWaterMark(writableStrategy, 1);
+            const writableSizeAlgorithm = ExtractSizeAlgorithm(writableStrategy);
+            let startPromise_resolve;
+            const startPromise = newPromise(resolve => {
+                startPromise_resolve = resolve;
+            });
+            InitializeTransformStream(this, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm);
+            SetUpTransformStreamDefaultControllerFromTransformer(this, transformer);
+            if (transformer.start !== undefined) {
+                startPromise_resolve(transformer.start(this._transformStreamController));
+            }
+            else {
+                startPromise_resolve(undefined);
+            }
+        }
+        /**
+         * The readable side of the transform stream.
+         */
+        get readable() {
+            if (!IsTransformStream(this)) {
+                throw streamBrandCheckException('readable');
+            }
+            return this._readable;
+        }
+        /**
+         * The writable side of the transform stream.
+         */
+        get writable() {
+            if (!IsTransformStream(this)) {
+                throw streamBrandCheckException('writable');
+            }
+            return this._writable;
+        }
+    }
+    Object.defineProperties(TransformStream.prototype, {
+        readable: { enumerable: true },
+        writable: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(TransformStream.prototype, SymbolPolyfill.toStringTag, {
+            value: 'TransformStream',
+            configurable: true
+        });
+    }
+    function InitializeTransformStream(stream, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm) {
+        function startAlgorithm() {
+            return startPromise;
+        }
+        function writeAlgorithm(chunk) {
+            return TransformStreamDefaultSinkWriteAlgorithm(stream, chunk);
+        }
+        function abortAlgorithm(reason) {
+            return TransformStreamDefaultSinkAbortAlgorithm(stream, reason);
+        }
+        function closeAlgorithm() {
+            return TransformStreamDefaultSinkCloseAlgorithm(stream);
+        }
+        stream._writable = CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, writableHighWaterMark, writableSizeAlgorithm);
+        function pullAlgorithm() {
+            return TransformStreamDefaultSourcePullAlgorithm(stream);
+        }
+        function cancelAlgorithm(reason) {
+            TransformStreamErrorWritableAndUnblockWrite(stream, reason);
+            return promiseResolvedWith(undefined);
+        }
+        stream._readable = CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, readableHighWaterMark, readableSizeAlgorithm);
+        // The [[backpressure]] slot is set to undefined so that it can be initialised by TransformStreamSetBackpressure.
+        stream._backpressure = undefined;
+        stream._backpressureChangePromise = undefined;
+        stream._backpressureChangePromise_resolve = undefined;
+        TransformStreamSetBackpressure(stream, true);
+        stream._transformStreamController = undefined;
+    }
+    function IsTransformStream(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_transformStreamController')) {
+            return false;
+        }
+        return x instanceof TransformStream;
+    }
+    // This is a no-op if both sides are already errored.
+    function TransformStreamError(stream, e) {
+        ReadableStreamDefaultControllerError(stream._readable._readableStreamController, e);
+        TransformStreamErrorWritableAndUnblockWrite(stream, e);
+    }
+    function TransformStreamErrorWritableAndUnblockWrite(stream, e) {
+        TransformStreamDefaultControllerClearAlgorithms(stream._transformStreamController);
+        WritableStreamDefaultControllerErrorIfNeeded(stream._writable._writableStreamController, e);
+        if (stream._backpressure) {
+            // Pretend that pull() was called to permit any pending write() calls to complete. TransformStreamSetBackpressure()
+            // cannot be called from enqueue() or pull() once the ReadableStream is errored, so this will will be the final time
+            // _backpressure is set.
+            TransformStreamSetBackpressure(stream, false);
+        }
+    }
+    function TransformStreamSetBackpressure(stream, backpressure) {
+        // Passes also when called during construction.
+        if (stream._backpressureChangePromise !== undefined) {
+            stream._backpressureChangePromise_resolve();
+        }
+        stream._backpressureChangePromise = newPromise(resolve => {
+            stream._backpressureChangePromise_resolve = resolve;
+        });
+        stream._backpressure = backpressure;
+    }
+    // Class TransformStreamDefaultController
+    /**
+     * Allows control of the {@link ReadableStream} and {@link WritableStream} of the associated {@link TransformStream}.
+     *
+     * @public
+     */
+    class TransformStreamDefaultController {
+        constructor() {
+            throw new TypeError('Illegal constructor');
+        }
+        /**
+         * Returns the desired size to fill the readable side’s internal queue. It can be negative, if the queue is over-full.
+         */
+        get desiredSize() {
+            if (!IsTransformStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException('desiredSize');
+            }
+            const readableController = this._controlledTransformStream._readable._readableStreamController;
+            return ReadableStreamDefaultControllerGetDesiredSize(readableController);
+        }
+        enqueue(chunk = undefined) {
+            if (!IsTransformStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException('enqueue');
+            }
+            TransformStreamDefaultControllerEnqueue(this, chunk);
+        }
+        /**
+         * Errors both the readable side and the writable side of the controlled transform stream, making all future
+         * interactions with it fail with the given error `e`. Any chunks queued for transformation will be discarded.
+         */
+        error(reason = undefined) {
+            if (!IsTransformStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException('error');
+            }
+            TransformStreamDefaultControllerError(this, reason);
+        }
+        /**
+         * Closes the readable side and errors the writable side of the controlled transform stream. This is useful when the
+         * transformer only needs to consume a portion of the chunks written to the writable side.
+         */
+        terminate() {
+            if (!IsTransformStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException('terminate');
+            }
+            TransformStreamDefaultControllerTerminate(this);
+        }
+    }
+    Object.defineProperties(TransformStreamDefaultController.prototype, {
+        enqueue: { enumerable: true },
+        error: { enumerable: true },
+        terminate: { enumerable: true },
+        desiredSize: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(TransformStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+            value: 'TransformStreamDefaultController',
+            configurable: true
+        });
+    }
+    // Transform Stream Default Controller Abstract Operations
+    function IsTransformStreamDefaultController(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_controlledTransformStream')) {
+            return false;
+        }
+        return x instanceof TransformStreamDefaultController;
+    }
+    function SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm) {
+        controller._controlledTransformStream = stream;
+        stream._transformStreamController = controller;
+        controller._transformAlgorithm = transformAlgorithm;
+        controller._flushAlgorithm = flushAlgorithm;
+    }
+    function SetUpTransformStreamDefaultControllerFromTransformer(stream, transformer) {
+        const controller = Object.create(TransformStreamDefaultController.prototype);
+        let transformAlgorithm = (chunk) => {
+            try {
+                TransformStreamDefaultControllerEnqueue(controller, chunk);
+                return promiseResolvedWith(undefined);
+            }
+            catch (transformResultE) {
+                return promiseRejectedWith(transformResultE);
+            }
+        };
+        let flushAlgorithm = () => promiseResolvedWith(undefined);
+        if (transformer.transform !== undefined) {
+            transformAlgorithm = chunk => transformer.transform(chunk, controller);
+        }
+        if (transformer.flush !== undefined) {
+            flushAlgorithm = () => transformer.flush(controller);
+        }
+        SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);
+    }
+    function TransformStreamDefaultControllerClearAlgorithms(controller) {
+        controller._transformAlgorithm = undefined;
+        controller._flushAlgorithm = undefined;
+    }
+    function TransformStreamDefaultControllerEnqueue(controller, chunk) {
+        const stream = controller._controlledTransformStream;
+        const readableController = stream._readable._readableStreamController;
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(readableController)) {
+            throw new TypeError('Readable side is not in a state that permits enqueue');
+        }
+        // We throttle transform invocations based on the backpressure of the ReadableStream, but we still
+        // accept TransformStreamDefaultControllerEnqueue() calls.
+        try {
+            ReadableStreamDefaultControllerEnqueue(readableController, chunk);
+        }
+        catch (e) {
+            // This happens when readableStrategy.size() throws.
+            TransformStreamErrorWritableAndUnblockWrite(stream, e);
+            throw stream._readable._storedError;
+        }
+        const backpressure = ReadableStreamDefaultControllerHasBackpressure(readableController);
+        if (backpressure !== stream._backpressure) {
+            TransformStreamSetBackpressure(stream, true);
+        }
+    }
+    function TransformStreamDefaultControllerError(controller, e) {
+        TransformStreamError(controller._controlledTransformStream, e);
+    }
+    function TransformStreamDefaultControllerPerformTransform(controller, chunk) {
+        const transformPromise = controller._transformAlgorithm(chunk);
+        return transformPromiseWith(transformPromise, undefined, r => {
+            TransformStreamError(controller._controlledTransformStream, r);
+            throw r;
+        });
+    }
+    function TransformStreamDefaultControllerTerminate(controller) {
+        const stream = controller._controlledTransformStream;
+        const readableController = stream._readable._readableStreamController;
+        ReadableStreamDefaultControllerClose(readableController);
+        const error = new TypeError('TransformStream terminated');
+        TransformStreamErrorWritableAndUnblockWrite(stream, error);
+    }
+    // TransformStreamDefaultSink Algorithms
+    function TransformStreamDefaultSinkWriteAlgorithm(stream, chunk) {
+        const controller = stream._transformStreamController;
+        if (stream._backpressure) {
+            const backpressureChangePromise = stream._backpressureChangePromise;
+            return transformPromiseWith(backpressureChangePromise, () => {
+                const writable = stream._writable;
+                const state = writable._state;
+                if (state === 'erroring') {
+                    throw writable._storedError;
+                }
+                return TransformStreamDefaultControllerPerformTransform(controller, chunk);
+            });
+        }
+        return TransformStreamDefaultControllerPerformTransform(controller, chunk);
+    }
+    function TransformStreamDefaultSinkAbortAlgorithm(stream, reason) {
+        // abort() is not called synchronously, so it is possible for abort() to be called when the stream is already
+        // errored.
+        TransformStreamError(stream, reason);
+        return promiseResolvedWith(undefined);
+    }
+    function TransformStreamDefaultSinkCloseAlgorithm(stream) {
+        // stream._readable cannot change after construction, so caching it across a call to user code is safe.
+        const readable = stream._readable;
+        const controller = stream._transformStreamController;
+        const flushPromise = controller._flushAlgorithm();
+        TransformStreamDefaultControllerClearAlgorithms(controller);
+        // Return a promise that is fulfilled with undefined on success.
+        return transformPromiseWith(flushPromise, () => {
+            if (readable._state === 'errored') {
+                throw readable._storedError;
+            }
+            ReadableStreamDefaultControllerClose(readable._readableStreamController);
+        }, r => {
+            TransformStreamError(stream, r);
+            throw readable._storedError;
+        });
+    }
+    // TransformStreamDefaultSource Algorithms
+    function TransformStreamDefaultSourcePullAlgorithm(stream) {
+        // Invariant. Enforced by the promises returned by start() and pull().
+        TransformStreamSetBackpressure(stream, false);
+        // Prevent the next pull() call until there is backpressure.
+        return stream._backpressureChangePromise;
+    }
+    // Helper functions for the TransformStreamDefaultController.
+    function defaultControllerBrandCheckException(name) {
+        return new TypeError(`TransformStreamDefaultController.prototype.${name} can only be used on a TransformStreamDefaultController`);
+    }
+    // Helper functions for the TransformStream.
+    function streamBrandCheckException(name) {
+        return new TypeError(`TransformStream.prototype.${name} can only be used on a TransformStream`);
+    }
+
+    exports.ByteLengthQueuingStrategy = ByteLengthQueuingStrategy;
+    exports.CountQueuingStrategy = CountQueuingStrategy;
+    exports.ReadableByteStreamController = ReadableByteStreamController;
+    exports.ReadableStream = ReadableStream;
+    exports.ReadableStreamBYOBReader = ReadableStreamBYOBReader;
+    exports.ReadableStreamBYOBRequest = ReadableStreamBYOBRequest;
+    exports.ReadableStreamDefaultController = ReadableStreamDefaultController;
+    exports.ReadableStreamDefaultReader = ReadableStreamDefaultReader;
+    exports.TransformStream = TransformStream;
+    exports.TransformStreamDefaultController = TransformStreamDefaultController;
+    exports.WritableStream = WritableStream;
+    exports.WritableStreamDefaultController = WritableStreamDefaultController;
+    exports.WritableStreamDefaultWriter = WritableStreamDefaultWriter;
+
+    Object.defineProperty(exports, '__esModule', { value: true });
+
+})));
+//# sourceMappingURL=ponyfill.es6.js.map
diff --git a/node_modules/web-streams-polyfill/dist/ponyfill.es6.js.map b/node_modules/web-streams-polyfill/dist/ponyfill.es6.js.map
new file mode 100644
index 0000000..f2b0fdc
--- /dev/null
+++ b/node_modules/web-streams-polyfill/dist/ponyfill.es6.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"ponyfill.es6.js","sources":["../src/stub/symbol.ts","../src/utils.ts","../src/lib/helpers/miscellaneous.ts","../src/lib/helpers/webidl.ts","../src/lib/simple-queue.ts","../src/lib/readable-stream/generic-reader.ts","../src/lib/abstract-ops/internal-methods.ts","../src/stub/number-isfinite.ts","../src/stub/math-trunc.ts","../src/lib/validators/basic.ts","../src/lib/validators/readable-stream.ts","../src/lib/readable-stream/default-reader.ts","../src/target/es5/stub/async-iterator-prototype.ts","../src/lib/readable-stream/async-iterator.ts","../src/stub/number-isnan.ts","../src/lib/abstract-ops/ecmascript.ts","../src/lib/abstract-ops/miscellaneous.ts","../src/lib/abstract-ops/queue-with-sizes.ts","../src/lib/readable-stream/byte-stream-controller.ts","../src/lib/readable-stream/byob-reader.ts","../src/lib/abstract-ops/queuing-strategy.ts","../src/lib/validators/queuing-strategy.ts","../src/lib/validators/underlying-sink.ts","../src/lib/validators/writable-stream.ts","../src/lib/abort-signal.ts","../src/lib/writable-stream.ts","../src/stub/native.ts","../src/stub/dom-exception.ts","../src/lib/readable-stream/pipe.ts","../src/lib/readable-stream/default-controller.ts","../src/lib/readable-stream/tee.ts","../src/lib/validators/underlying-source.ts","../src/lib/validators/reader-options.ts","../src/lib/validators/iterator-options.ts","../src/lib/validators/pipe-options.ts","../src/lib/validators/readable-writable-pair.ts","../src/lib/readable-stream.ts","../src/lib/validators/queuing-strategy-init.ts","../src/lib/byte-length-queuing-strategy.ts","../src/lib/count-queuing-strategy.ts","../src/lib/validators/transformer.ts","../src/lib/transform-stream.ts"],"sourcesContent":["/// <reference lib=\"es2015.symbol\" />\n\nconst SymbolPolyfill: (description?: string) => symbol =\n  typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol' ?\n    Symbol :\n    description => `Symbol(${description})` as any as symbol;\n\nexport default SymbolPolyfill;\n","/// <reference lib=\"dom\" />\n\nexport function noop(): undefined {\n  return undefined;\n}\n\nfunction getGlobals() {\n  if (typeof self !== 'undefined') {\n    return self;\n  } else if (typeof window !== 'undefined') {\n    return window;\n  } else if (typeof global !== 'undefined') {\n    return global;\n  }\n  return undefined;\n}\n\nexport const globals = getGlobals();\n","import { noop } from '../../utils';\nimport { AssertionError } from '../../stub/assert';\n\nexport function typeIsObject(x: any): x is object {\n  return (typeof x === 'object' && x !== null) || typeof x === 'function';\n}\n\nexport const rethrowAssertionErrorRejection: (e: any) => void =\n  DEBUG ? e => {\n    // Used throughout the reference implementation, as `.catch(rethrowAssertionErrorRejection)`, to ensure any errors\n    // get shown. There are places in the spec where we do promise transformations and purposefully ignore or don't\n    // expect any errors, but assertion errors are always problematic.\n    if (e && e instanceof AssertionError) {\n      setTimeout(() => {\n        throw e;\n      }, 0);\n    }\n  } : noop;\n","import { globals } from '../../utils';\nimport { rethrowAssertionErrorRejection } from './miscellaneous';\nimport assert from '../../stub/assert';\n\nconst originalPromise = Promise;\nconst originalPromiseThen = Promise.prototype.then;\nconst originalPromiseResolve = Promise.resolve.bind(originalPromise);\nconst originalPromiseReject = Promise.reject.bind(originalPromise);\n\nexport function newPromise<T>(executor: (\n  resolve: (value: T | PromiseLike<T>) => void,\n  reject: (reason?: any) => void\n) => void): Promise<T> {\n  return new originalPromise(executor);\n}\n\nexport function promiseResolvedWith<T>(value: T | PromiseLike<T>): Promise<T> {\n  return originalPromiseResolve(value);\n}\n\nexport function promiseRejectedWith<T = never>(reason: any): Promise<T> {\n  return originalPromiseReject(reason);\n}\n\nexport function PerformPromiseThen<T, TResult1 = T, TResult2 = never>(\n  promise: Promise<T>,\n  onFulfilled?: (value: T) => TResult1 | PromiseLike<TResult1>,\n  onRejected?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2> {\n  // There doesn't appear to be any way to correctly emulate the behaviour from JavaScript, so this is just an\n  // approximation.\n  return originalPromiseThen.call(promise, onFulfilled, onRejected) as Promise<TResult1 | TResult2>;\n}\n\nexport function uponPromise<T>(\n  promise: Promise<T>,\n  onFulfilled?: (value: T) => void | PromiseLike<void>,\n  onRejected?: (reason: any) => void | PromiseLike<void>): void {\n  PerformPromiseThen(\n    PerformPromiseThen(promise, onFulfilled, onRejected),\n    undefined,\n    rethrowAssertionErrorRejection\n  );\n}\n\nexport function uponFulfillment<T>(promise: Promise<T>, onFulfilled: (value: T) => void | PromiseLike<void>): void {\n  uponPromise(promise, onFulfilled);\n}\n\nexport function uponRejection(promise: Promise<unknown>, onRejected: (reason: any) => void | PromiseLike<void>): void {\n  uponPromise(promise, undefined, onRejected);\n}\n\nexport function transformPromiseWith<T, TResult1 = T, TResult2 = never>(\n  promise: Promise<T>,\n  fulfillmentHandler?: (value: T) => TResult1 | PromiseLike<TResult1>,\n  rejectionHandler?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2> {\n  return PerformPromiseThen(promise, fulfillmentHandler, rejectionHandler);\n}\n\nexport function setPromiseIsHandledToTrue(promise: Promise<unknown>): void {\n  PerformPromiseThen(promise, undefined, rethrowAssertionErrorRejection);\n}\n\nexport const queueMicrotask: (fn: () => void) => void = (() => {\n  const globalQueueMicrotask = globals && globals.queueMicrotask;\n  if (typeof globalQueueMicrotask === 'function') {\n    return globalQueueMicrotask;\n  }\n\n  const resolvedPromise = promiseResolvedWith(undefined);\n  return (fn: () => void) => PerformPromiseThen(resolvedPromise, fn);\n})();\n\nexport function reflectCall<T, A extends any[], R>(F: (this: T, ...fnArgs: A) => R, V: T, args: A): R {\n  if (typeof F !== 'function') {\n    throw new TypeError('Argument is not a function');\n  }\n  return Function.prototype.apply.call(F, V, args);\n}\n\nexport function promiseCall<T, A extends any[], R>(F: (this: T, ...fnArgs: A) => R | PromiseLike<R>,\n                                                   V: T,\n                                                   args: A): Promise<R> {\n  assert(typeof F === 'function');\n  assert(V !== undefined);\n  assert(Array.isArray(args));\n  try {\n    return promiseResolvedWith(reflectCall(F, V, args));\n  } catch (value) {\n    return promiseRejectedWith(value);\n  }\n}\n","import assert from '../stub/assert';\n\n// Original from Chromium\n// https://chromium.googlesource.com/chromium/src/+/0aee4434a4dba42a42abaea9bfbc0cd196a63bc1/third_party/blink/renderer/core/streams/SimpleQueue.js\n\nconst QUEUE_MAX_ARRAY_SIZE = 16384;\n\ninterface Node<T> {\n  _elements: T[];\n  _next: Node<T> | undefined;\n}\n\n/**\n * Simple queue structure.\n *\n * Avoids scalability issues with using a packed array directly by using\n * multiple arrays in a linked list and keeping the array size bounded.\n */\nexport class SimpleQueue<T> {\n  private _front: Node<T>;\n  private _back: Node<T>;\n  private _cursor = 0;\n  private _size = 0;\n\n  constructor() {\n    // _front and _back are always defined.\n    this._front = {\n      _elements: [],\n      _next: undefined\n    };\n    this._back = this._front;\n    // The cursor is used to avoid calling Array.shift().\n    // It contains the index of the front element of the array inside the\n    // front-most node. It is always in the range [0, QUEUE_MAX_ARRAY_SIZE).\n    this._cursor = 0;\n    // When there is only one node, size === elements.length - cursor.\n    this._size = 0;\n  }\n\n  get length(): number {\n    return this._size;\n  }\n\n  // For exception safety, this method is structured in order:\n  // 1. Read state\n  // 2. Calculate required state mutations\n  // 3. Perform state mutations\n  push(element: T): void {\n    const oldBack = this._back;\n    let newBack = oldBack;\n    assert(oldBack._next === undefined);\n    if (oldBack._elements.length === QUEUE_MAX_ARRAY_SIZE - 1) {\n      newBack = {\n        _elements: [],\n        _next: undefined\n      };\n    }\n\n    // push() is the mutation most likely to throw an exception, so it\n    // goes first.\n    oldBack._elements.push(element);\n    if (newBack !== oldBack) {\n      this._back = newBack;\n      oldBack._next = newBack;\n    }\n    ++this._size;\n  }\n\n  // Like push(), shift() follows the read -> calculate -> mutate pattern for\n  // exception safety.\n  shift(): T {\n    assert(this._size > 0); // must not be called on an empty queue\n\n    const oldFront = this._front;\n    let newFront = oldFront;\n    const oldCursor = this._cursor;\n    let newCursor = oldCursor + 1;\n\n    const elements = oldFront._elements;\n    const element = elements[oldCursor];\n\n    if (newCursor === QUEUE_MAX_ARRAY_SIZE) {\n      assert(elements.length === QUEUE_MAX_ARRAY_SIZE);\n      assert(oldFront._next !== undefined);\n      newFront = oldFront._next!;\n      newCursor = 0;\n    }\n\n    // No mutations before this point.\n    --this._size;\n    this._cursor = newCursor;\n    if (oldFront !== newFront) {\n      this._front = newFront;\n    }\n\n    // Permit shifted element to be garbage collected.\n    elements[oldCursor] = undefined!;\n\n    return element;\n  }\n\n  // The tricky thing about forEach() is that it can be called\n  // re-entrantly. The queue may be mutated inside the callback. It is easy to\n  // see that push() within the callback has no negative effects since the end\n  // of the queue is checked for on every iteration. If shift() is called\n  // repeatedly within the callback then the next iteration may return an\n  // element that has been removed. In this case the callback will be called\n  // with undefined values until we either \"catch up\" with elements that still\n  // exist or reach the back of the queue.\n  forEach(callback: (element: T) => void): void {\n    let i = this._cursor;\n    let node = this._front;\n    let elements = node._elements;\n    while (i !== elements.length || node._next !== undefined) {\n      if (i === elements.length) {\n        assert(node._next !== undefined);\n        assert(i === QUEUE_MAX_ARRAY_SIZE);\n        node = node._next!;\n        elements = node._elements;\n        i = 0;\n        if (elements.length === 0) {\n          break;\n        }\n      }\n      callback(elements[i]);\n      ++i;\n    }\n  }\n\n  // Return the element that would be returned if shift() was called now,\n  // without modifying the queue.\n  peek(): T {\n    assert(this._size > 0); // must not be called on an empty queue\n\n    const front = this._front;\n    const cursor = this._cursor;\n    return front._elements[cursor];\n  }\n}\n","import assert from '../../stub/assert';\nimport { ReadableStream, ReadableStreamCancel, ReadableStreamReader } from '../readable-stream';\nimport { newPromise, setPromiseIsHandledToTrue } from '../helpers/webidl';\n\nexport function ReadableStreamReaderGenericInitialize<R>(reader: ReadableStreamReader<R>, stream: ReadableStream<R>) {\n  reader._ownerReadableStream = stream;\n  stream._reader = reader;\n\n  if (stream._state === 'readable') {\n    defaultReaderClosedPromiseInitialize(reader);\n  } else if (stream._state === 'closed') {\n    defaultReaderClosedPromiseInitializeAsResolved(reader);\n  } else {\n    assert(stream._state === 'errored');\n\n    defaultReaderClosedPromiseInitializeAsRejected(reader, stream._storedError);\n  }\n}\n\n// A client of ReadableStreamDefaultReader and ReadableStreamBYOBReader may use these functions directly to bypass state\n// check.\n\nexport function ReadableStreamReaderGenericCancel(reader: ReadableStreamReader<any>, reason: any): Promise<undefined> {\n  const stream = reader._ownerReadableStream;\n  assert(stream !== undefined);\n  return ReadableStreamCancel(stream, reason);\n}\n\nexport function ReadableStreamReaderGenericRelease(reader: ReadableStreamReader<any>) {\n  assert(reader._ownerReadableStream !== undefined);\n  assert(reader._ownerReadableStream._reader === reader);\n\n  if (reader._ownerReadableStream._state === 'readable') {\n    defaultReaderClosedPromiseReject(\n      reader,\n      new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));\n  } else {\n    defaultReaderClosedPromiseResetToRejected(\n      reader,\n      new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));\n  }\n\n  reader._ownerReadableStream._reader = undefined;\n  reader._ownerReadableStream = undefined!;\n}\n\n// Helper functions for the readers.\n\nexport function readerLockException(name: string): TypeError {\n  return new TypeError('Cannot ' + name + ' a stream using a released reader');\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nexport function defaultReaderClosedPromiseInitialize(reader: ReadableStreamReader<any>) {\n  reader._closedPromise = newPromise((resolve, reject) => {\n    reader._closedPromise_resolve = resolve;\n    reader._closedPromise_reject = reject;\n  });\n}\n\nexport function defaultReaderClosedPromiseInitializeAsRejected(reader: ReadableStreamReader<any>, reason: any) {\n  defaultReaderClosedPromiseInitialize(reader);\n  defaultReaderClosedPromiseReject(reader, reason);\n}\n\nexport function defaultReaderClosedPromiseInitializeAsResolved(reader: ReadableStreamReader<any>) {\n  defaultReaderClosedPromiseInitialize(reader);\n  defaultReaderClosedPromiseResolve(reader);\n}\n\nexport function defaultReaderClosedPromiseReject(reader: ReadableStreamReader<any>, reason: any) {\n  if (reader._closedPromise_reject === undefined) {\n    return;\n  }\n\n  setPromiseIsHandledToTrue(reader._closedPromise);\n  reader._closedPromise_reject(reason);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n\nexport function defaultReaderClosedPromiseResetToRejected(reader: ReadableStreamReader<any>, reason: any) {\n  assert(reader._closedPromise_resolve === undefined);\n  assert(reader._closedPromise_reject === undefined);\n\n  defaultReaderClosedPromiseInitializeAsRejected(reader, reason);\n}\n\nexport function defaultReaderClosedPromiseResolve(reader: ReadableStreamReader<any>) {\n  if (reader._closedPromise_resolve === undefined) {\n    return;\n  }\n\n  reader._closedPromise_resolve(undefined);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n","export const AbortSteps = Symbol('[[AbortSteps]]');\nexport const ErrorSteps = Symbol('[[ErrorSteps]]');\nexport const CancelSteps = Symbol('[[CancelSteps]]');\nexport const PullSteps = Symbol('[[PullSteps]]');\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite#Polyfill\nconst NumberIsFinite: typeof Number.isFinite = Number.isFinite || function (x) {\n  return typeof x === 'number' && isFinite(x);\n};\n\nexport default NumberIsFinite;\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc#Polyfill\nconst MathTrunc: typeof Math.trunc = Math.trunc || function (v) {\n  return v < 0 ? Math.ceil(v) : Math.floor(v);\n};\n\nexport default MathTrunc;\n","import NumberIsFinite from '../../stub/number-isfinite';\nimport MathTrunc from '../../stub/math-trunc';\n\n// https://heycam.github.io/webidl/#idl-dictionaries\nexport function isDictionary(x: any): x is object | null {\n  return typeof x === 'object' || typeof x === 'function';\n}\n\nexport function assertDictionary(obj: unknown,\n                                 context: string): asserts obj is object | null | undefined {\n  if (obj !== undefined && !isDictionary(obj)) {\n    throw new TypeError(`${context} is not an object.`);\n  }\n}\n\nexport type AnyFunction = (...args: any[]) => any;\n\n// https://heycam.github.io/webidl/#idl-callback-functions\nexport function assertFunction(x: unknown, context: string): asserts x is AnyFunction {\n  if (typeof x !== 'function') {\n    throw new TypeError(`${context} is not a function.`);\n  }\n}\n\n// https://heycam.github.io/webidl/#idl-object\nexport function isObject(x: any): x is object {\n  return (typeof x === 'object' && x !== null) || typeof x === 'function';\n}\n\nexport function assertObject(x: unknown,\n                             context: string): asserts x is object {\n  if (!isObject(x)) {\n    throw new TypeError(`${context} is not an object.`);\n  }\n}\n\nexport function assertRequiredArgument<T extends any>(x: T | undefined,\n                                                      position: number,\n                                                      context: string): asserts x is T {\n  if (x === undefined) {\n    throw new TypeError(`Parameter ${position} is required in '${context}'.`);\n  }\n}\n\nexport function assertRequiredField<T extends any>(x: T | undefined,\n                                                   field: string,\n                                                   context: string): asserts x is T {\n  if (x === undefined) {\n    throw new TypeError(`${field} is required in '${context}'.`);\n  }\n}\n\n// https://heycam.github.io/webidl/#idl-unrestricted-double\nexport function convertUnrestrictedDouble(value: unknown): number {\n  return Number(value);\n}\n\nfunction censorNegativeZero(x: number): number {\n  return x === 0 ? 0 : x;\n}\n\nfunction integerPart(x: number): number {\n  return censorNegativeZero(MathTrunc(x));\n}\n\n// https://heycam.github.io/webidl/#idl-unsigned-long-long\nexport function convertUnsignedLongLongWithEnforceRange(value: unknown, context: string): number {\n  const lowerBound = 0;\n  const upperBound = Number.MAX_SAFE_INTEGER;\n\n  let x = Number(value);\n  x = censorNegativeZero(x);\n\n  if (!NumberIsFinite(x)) {\n    throw new TypeError(`${context} is not a finite number`);\n  }\n\n  x = integerPart(x);\n\n  if (x < lowerBound || x > upperBound) {\n    throw new TypeError(`${context} is outside the accepted range of ${lowerBound} to ${upperBound}, inclusive`);\n  }\n\n  if (!NumberIsFinite(x) || x === 0) {\n    return 0;\n  }\n\n  // TODO Use BigInt if supported?\n  // let xBigInt = BigInt(integerPart(x));\n  // xBigInt = BigInt.asUintN(64, xBigInt);\n  // return Number(xBigInt);\n\n  return x;\n}\n","import { IsReadableStream, ReadableStream } from '../readable-stream';\n\nexport function assertReadableStream(x: unknown, context: string): asserts x is ReadableStream {\n  if (!IsReadableStream(x)) {\n    throw new TypeError(`${context} is not a ReadableStream.`);\n  }\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericInitialize,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport { IsReadableStreamLocked, ReadableStream } from '../readable-stream';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { PullSteps } from '../abstract-ops/internal-methods';\nimport { newPromise, promiseRejectedWith } from '../helpers/webidl';\nimport { assertRequiredArgument } from '../validators/basic';\nimport { assertReadableStream } from '../validators/readable-stream';\n\n/**\n * A result returned by {@link ReadableStreamDefaultReader.read}.\n *\n * @public\n */\nexport type ReadableStreamDefaultReadResult<T> = {\n  done: false;\n  value: T;\n} | {\n  done: true;\n  value?: undefined;\n}\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamDefaultReader<R>(stream: ReadableStream): ReadableStreamDefaultReader<R> {\n  return new ReadableStreamDefaultReader(stream);\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamAddReadRequest<R>(stream: ReadableStream<R>,\n                                                readRequest: ReadRequest<R>): void {\n  assert(IsReadableStreamDefaultReader(stream._reader));\n  assert(stream._state === 'readable');\n\n  (stream._reader! as ReadableStreamDefaultReader<R>)._readRequests.push(readRequest);\n}\n\nexport function ReadableStreamFulfillReadRequest<R>(stream: ReadableStream<R>, chunk: R | undefined, done: boolean) {\n  const reader = stream._reader as ReadableStreamDefaultReader<R>;\n\n  assert(reader._readRequests.length > 0);\n\n  const readRequest = reader._readRequests.shift()!;\n  if (done) {\n    readRequest._closeSteps();\n  } else {\n    readRequest._chunkSteps(chunk!);\n  }\n}\n\nexport function ReadableStreamGetNumReadRequests<R>(stream: ReadableStream<R>): number {\n  return (stream._reader as ReadableStreamDefaultReader<R>)._readRequests.length;\n}\n\nexport function ReadableStreamHasDefaultReader(stream: ReadableStream): boolean {\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return false;\n  }\n\n  if (!IsReadableStreamDefaultReader(reader)) {\n    return false;\n  }\n\n  return true;\n}\n\n// Readers\n\nexport interface ReadRequest<R> {\n  _chunkSteps(chunk: R): void;\n\n  _closeSteps(): void;\n\n  _errorSteps(e: any): void;\n}\n\n/**\n * A default reader vended by a {@link ReadableStream}.\n *\n * @public\n */\nexport class ReadableStreamDefaultReader<R = any> {\n  /** @internal */\n  _ownerReadableStream!: ReadableStream<R>;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readRequests: SimpleQueue<ReadRequest<R>>;\n\n  constructor(stream: ReadableStream<R>) {\n    assertRequiredArgument(stream, 1, 'ReadableStreamDefaultReader');\n    assertReadableStream(stream, 'First parameter');\n\n    if (IsReadableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n    }\n\n    ReadableStreamReaderGenericInitialize(this, stream);\n\n    this._readRequests = new SimpleQueue();\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed,\n   * or rejected if the stream ever errors or the reader's lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('cancel'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('cancel'));\n    }\n\n    return ReadableStreamReaderGenericCancel(this, reason);\n  }\n\n  /**\n   * Returns a promise that allows access to the next chunk from the stream's internal queue, if available.\n   *\n   * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.\n   */\n  read(): Promise<ReadableStreamDefaultReadResult<R>> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('read'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('read from'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamDefaultReadResult<R>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamDefaultReadResult<R>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),\n      _closeSteps: () => resolvePromise({ value: undefined, done: true }),\n      _errorSteps: e => rejectPromise(e)\n    };\n    ReadableStreamDefaultReaderRead(this, readRequest);\n    return promise;\n  }\n\n  /**\n   * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.\n   * If the associated stream is errored when the lock is released, the reader will appear errored in the same way\n   * from now on; otherwise, the reader will appear closed.\n   *\n   * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by\n   * the reader's {@link ReadableStreamDefaultReader.read | read()} method has not yet been settled. Attempting to\n   * do so will throw a `TypeError` and leave the reader locked to the stream.\n   */\n  releaseLock(): void {\n    if (!IsReadableStreamDefaultReader(this)) {\n      throw defaultReaderBrandCheckException('releaseLock');\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return;\n    }\n\n    if (this._readRequests.length > 0) {\n      throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n    }\n\n    ReadableStreamReaderGenericRelease(this);\n  }\n}\n\nObject.defineProperties(ReadableStreamDefaultReader.prototype, {\n  cancel: { enumerable: true },\n  read: { enumerable: true },\n  releaseLock: { enumerable: true },\n  closed: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamDefaultReader.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamDefaultReader',\n    configurable: true\n  });\n}\n\n// Abstract operations for the readers.\n\nexport function IsReadableStreamDefaultReader<R = any>(x: any): x is ReadableStreamDefaultReader<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readRequests')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamDefaultReader;\n}\n\nexport function ReadableStreamDefaultReaderRead<R>(reader: ReadableStreamDefaultReader<R>,\n                                                   readRequest: ReadRequest<R>): void {\n  const stream = reader._ownerReadableStream;\n\n  assert(stream !== undefined);\n\n  stream._disturbed = true;\n\n  if (stream._state === 'closed') {\n    readRequest._closeSteps();\n  } else if (stream._state === 'errored') {\n    readRequest._errorSteps(stream._storedError);\n  } else {\n    assert(stream._state === 'readable');\n    stream._readableStreamController[PullSteps](readRequest as ReadRequest<any>);\n  }\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nfunction defaultReaderBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamDefaultReader.prototype.${name} can only be used on a ReadableStreamDefaultReader`);\n}\n","/// <reference lib=\"es2018.asynciterable\" />\n\nexport let AsyncIteratorPrototype: AsyncIterable<any> | undefined;\n\nif (typeof Symbol.asyncIterator === 'symbol') {\n  // We're running inside a ES2018+ environment, but we're compiling to an older syntax.\n  // We cannot access %AsyncIteratorPrototype% without non-ES2018 syntax, but we can re-create it.\n  AsyncIteratorPrototype = {\n    // 25.1.3.1 %AsyncIteratorPrototype% [ @@asyncIterator ] ( )\n    // https://tc39.github.io/ecma262/#sec-asynciteratorprototype-asynciterator\n    [Symbol.asyncIterator](this: AsyncIterator<any>) {\n      return this;\n    }\n  };\n  Object.defineProperty(AsyncIteratorPrototype, Symbol.asyncIterator, { enumerable: false });\n}\n","/// <reference lib=\"es2018.asynciterable\" />\n\nimport { ReadableStream } from '../readable-stream';\nimport {\n  AcquireReadableStreamDefaultReader,\n  ReadableStreamDefaultReader,\n  ReadableStreamDefaultReaderRead,\n  ReadableStreamDefaultReadResult,\n  ReadRequest\n} from './default-reader';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport assert from '../../stub/assert';\nimport { AsyncIteratorPrototype } from '@@target/stub/async-iterator-prototype';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport {\n  newPromise,\n  promiseRejectedWith,\n  promiseResolvedWith,\n  queueMicrotask,\n  transformPromiseWith\n} from '../helpers/webidl';\n\n/**\n * An async iterator returned by {@link ReadableStream.values}.\n *\n * @public\n */\nexport interface ReadableStreamAsyncIterator<R> extends AsyncIterator<R> {\n  next(): Promise<IteratorResult<R, undefined>>;\n\n  return(value?: any): Promise<IteratorResult<any>>;\n}\n\nexport class ReadableStreamAsyncIteratorImpl<R> {\n  private readonly _reader: ReadableStreamDefaultReader<R>;\n  private readonly _preventCancel: boolean;\n  private _ongoingPromise: Promise<ReadableStreamDefaultReadResult<R>> | undefined = undefined;\n  private _isFinished = false;\n\n  constructor(reader: ReadableStreamDefaultReader<R>, preventCancel: boolean) {\n    this._reader = reader;\n    this._preventCancel = preventCancel;\n  }\n\n  next(): Promise<ReadableStreamDefaultReadResult<R>> {\n    const nextSteps = () => this._nextSteps();\n    this._ongoingPromise = this._ongoingPromise ?\n      transformPromiseWith(this._ongoingPromise, nextSteps, nextSteps) :\n      nextSteps();\n    return this._ongoingPromise;\n  }\n\n  return(value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    const returnSteps = () => this._returnSteps(value);\n    return this._ongoingPromise ?\n      transformPromiseWith(this._ongoingPromise, returnSteps, returnSteps) :\n      returnSteps();\n  }\n\n  private _nextSteps(): Promise<ReadableStreamDefaultReadResult<R>> {\n    if (this._isFinished) {\n      return Promise.resolve({ value: undefined, done: true });\n    }\n\n    const reader = this._reader;\n    if (reader._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('iterate'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamDefaultReadResult<R>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamDefaultReadResult<R>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => {\n        this._ongoingPromise = undefined;\n        // This needs to be delayed by one microtask, otherwise we stop pulling too early which breaks a test.\n        // FIXME Is this a bug in the specification, or in the test?\n        queueMicrotask(() => resolvePromise({ value: chunk, done: false }));\n      },\n      _closeSteps: () => {\n        this._ongoingPromise = undefined;\n        this._isFinished = true;\n        ReadableStreamReaderGenericRelease(reader);\n        resolvePromise({ value: undefined, done: true });\n      },\n      _errorSteps: reason => {\n        this._ongoingPromise = undefined;\n        this._isFinished = true;\n        ReadableStreamReaderGenericRelease(reader);\n        rejectPromise(reason);\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n    return promise;\n  }\n\n  private _returnSteps(value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (this._isFinished) {\n      return Promise.resolve({ value, done: true });\n    }\n    this._isFinished = true;\n\n    const reader = this._reader;\n    if (reader._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('finish iterating'));\n    }\n\n    assert(reader._readRequests.length === 0);\n\n    if (!this._preventCancel) {\n      const result = ReadableStreamReaderGenericCancel(reader, value);\n      ReadableStreamReaderGenericRelease(reader);\n      return transformPromiseWith(result, () => ({ value, done: true }));\n    }\n\n    ReadableStreamReaderGenericRelease(reader);\n    return promiseResolvedWith({ value, done: true });\n  }\n}\n\ndeclare class ReadableStreamAsyncIteratorInstance<R> implements ReadableStreamAsyncIterator<R> {\n  /** @interal */\n  _asyncIteratorImpl: ReadableStreamAsyncIteratorImpl<R>;\n\n  next(): Promise<IteratorResult<R, undefined>>;\n\n  return(value?: any): Promise<IteratorResult<any>>;\n}\n\nconst ReadableStreamAsyncIteratorPrototype: ReadableStreamAsyncIteratorInstance<any> = {\n  next(this: ReadableStreamAsyncIteratorInstance<any>): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (!IsReadableStreamAsyncIterator(this)) {\n      return promiseRejectedWith(streamAsyncIteratorBrandCheckException('next'));\n    }\n    return this._asyncIteratorImpl.next();\n  },\n\n  return(this: ReadableStreamAsyncIteratorInstance<any>, value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (!IsReadableStreamAsyncIterator(this)) {\n      return promiseRejectedWith(streamAsyncIteratorBrandCheckException('return'));\n    }\n    return this._asyncIteratorImpl.return(value);\n  }\n} as any;\nif (AsyncIteratorPrototype !== undefined) {\n  Object.setPrototypeOf(ReadableStreamAsyncIteratorPrototype, AsyncIteratorPrototype);\n}\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamAsyncIterator<R>(stream: ReadableStream<R>,\n                                                      preventCancel: boolean): ReadableStreamAsyncIterator<R> {\n  const reader = AcquireReadableStreamDefaultReader<R>(stream);\n  const impl = new ReadableStreamAsyncIteratorImpl(reader, preventCancel);\n  const iterator: ReadableStreamAsyncIteratorInstance<R> = Object.create(ReadableStreamAsyncIteratorPrototype);\n  iterator._asyncIteratorImpl = impl;\n  return iterator;\n}\n\nfunction IsReadableStreamAsyncIterator<R = any>(x: any): x is ReadableStreamAsyncIterator<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_asyncIteratorImpl')) {\n    return false;\n  }\n\n  try {\n    // noinspection SuspiciousTypeOfGuard\n    return (x as ReadableStreamAsyncIteratorInstance<any>)._asyncIteratorImpl instanceof\n      ReadableStreamAsyncIteratorImpl;\n  } catch {\n    return false;\n  }\n}\n\n// Helper functions for the ReadableStream.\n\nfunction streamAsyncIteratorBrandCheckException(name: string): TypeError {\n  return new TypeError(`ReadableStreamAsyncIterator.${name} can only be used on a ReadableSteamAsyncIterator`);\n}\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Polyfill\nconst NumberIsNaN: typeof Number.isNaN = Number.isNaN || function (x) {\n  // eslint-disable-next-line no-self-compare\n  return x !== x;\n};\n\nexport default NumberIsNaN;\n","export function CreateArrayFromList<T extends any[]>(elements: T): T {\n  // We use arrays to represent lists, so this is basically a no-op.\n  // Do a slice though just in case we happen to depend on the unique-ness.\n  return elements.slice() as T;\n}\n\nexport function CopyDataBlockBytes(dest: ArrayBuffer,\n                                   destOffset: number,\n                                   src: ArrayBuffer,\n                                   srcOffset: number,\n                                   n: number) {\n  new Uint8Array(dest).set(new Uint8Array(src, srcOffset, n), destOffset);\n}\n\n// Not implemented correctly\nexport function TransferArrayBuffer<T extends ArrayBufferLike>(O: T): T {\n  return O;\n}\n\n// Not implemented correctly\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nexport function CanTransferArrayBuffer(O: ArrayBufferLike): boolean {\n  return true;\n}\n\n// Not implemented correctly\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nexport function IsDetachedBuffer(O: ArrayBufferLike): boolean {\n  return false;\n}\n\nexport function ArrayBufferSlice(buffer: ArrayBufferLike, begin: number, end: number): ArrayBufferLike {\n  // ArrayBuffer.prototype.slice is not available on IE10\n  // https://www.caniuse.com/mdn-javascript_builtins_arraybuffer_slice\n  if (buffer.slice) {\n    return buffer.slice(begin, end);\n  }\n  const length = end - begin;\n  const slice = new ArrayBuffer(length);\n  CopyDataBlockBytes(slice, 0, buffer, begin, length);\n  return slice;\n}\n","import NumberIsNaN from '../../stub/number-isnan';\nimport { ArrayBufferSlice } from './ecmascript';\n\nexport function IsNonNegativeNumber(v: number): boolean {\n  if (typeof v !== 'number') {\n    return false;\n  }\n\n  if (NumberIsNaN(v)) {\n    return false;\n  }\n\n  if (v < 0) {\n    return false;\n  }\n\n  return true;\n}\n\nexport function CloneAsUint8Array(O: ArrayBufferView): Uint8Array {\n  const buffer = ArrayBufferSlice(O.buffer, O.byteOffset, O.byteOffset + O.byteLength);\n  return new Uint8Array(buffer);\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport { IsNonNegativeNumber } from './miscellaneous';\n\nexport interface QueueContainer<T> {\n  _queue: SimpleQueue<T>;\n  _queueTotalSize: number;\n}\n\nexport interface QueuePair<T> {\n  value: T;\n  size: number;\n}\n\nexport function DequeueValue<T>(container: QueueContainer<QueuePair<T>>): T {\n  assert('_queue' in container && '_queueTotalSize' in container);\n  assert(container._queue.length > 0);\n\n  const pair = container._queue.shift()!;\n  container._queueTotalSize -= pair.size;\n  if (container._queueTotalSize < 0) {\n    container._queueTotalSize = 0;\n  }\n\n  return pair.value;\n}\n\nexport function EnqueueValueWithSize<T>(container: QueueContainer<QueuePair<T>>, value: T, size: number) {\n  assert('_queue' in container && '_queueTotalSize' in container);\n\n  if (!IsNonNegativeNumber(size) || size === Infinity) {\n    throw new RangeError('Size must be a finite, non-NaN, non-negative number.');\n  }\n\n  container._queue.push({ value, size });\n  container._queueTotalSize += size;\n}\n\nexport function PeekQueueValue<T>(container: QueueContainer<QueuePair<T>>): T {\n  assert('_queue' in container && '_queueTotalSize' in container);\n  assert(container._queue.length > 0);\n\n  const pair = container._queue.peek();\n  return pair.value;\n}\n\nexport function ResetQueue<T>(container: QueueContainer<T>) {\n  assert('_queue' in container && '_queueTotalSize' in container);\n\n  container._queue = new SimpleQueue<T>();\n  container._queueTotalSize = 0;\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport { ResetQueue } from '../abstract-ops/queue-with-sizes';\nimport {\n  ReadableStreamAddReadRequest,\n  ReadableStreamFulfillReadRequest,\n  ReadableStreamGetNumReadRequests,\n  ReadableStreamHasDefaultReader,\n  ReadRequest\n} from './default-reader';\nimport {\n  ReadableStreamAddReadIntoRequest,\n  ReadableStreamFulfillReadIntoRequest,\n  ReadableStreamGetNumReadIntoRequests,\n  ReadableStreamHasBYOBReader,\n  ReadIntoRequest\n} from './byob-reader';\nimport NumberIsInteger from '../../stub/number-isinteger';\nimport {\n  IsReadableStreamLocked,\n  ReadableByteStream,\n  ReadableStreamClose,\n  ReadableStreamError\n} from '../readable-stream';\nimport { ValidatedUnderlyingByteSource } from './underlying-source';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport {\n  ArrayBufferSlice,\n  CanTransferArrayBuffer,\n  CopyDataBlockBytes,\n  IsDetachedBuffer,\n  TransferArrayBuffer\n} from '../abstract-ops/ecmascript';\nimport { CancelSteps, PullSteps } from '../abstract-ops/internal-methods';\nimport { promiseResolvedWith, uponPromise } from '../helpers/webidl';\nimport { assertRequiredArgument, convertUnsignedLongLongWithEnforceRange } from '../validators/basic';\n\n/**\n * A pull-into request in a {@link ReadableByteStreamController}.\n *\n * @public\n */\nexport class ReadableStreamBYOBRequest {\n  /** @internal */\n  _associatedReadableByteStreamController!: ReadableByteStreamController;\n  /** @internal */\n  _view!: ArrayBufferView | null;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the view for writing in to, or `null` if the BYOB request has already been responded to.\n   */\n  get view(): ArrayBufferView | null {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('view');\n    }\n\n    return this._view;\n  }\n\n  /**\n   * Indicates to the associated readable byte stream that `bytesWritten` bytes were written into\n   * {@link ReadableStreamBYOBRequest.view | view}, causing the result be surfaced to the consumer.\n   *\n   * After this method is called, {@link ReadableStreamBYOBRequest.view | view} will be transferred and no longer\n   * modifiable.\n   */\n  respond(bytesWritten: number): void;\n  respond(bytesWritten: number | undefined): void {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('respond');\n    }\n    assertRequiredArgument(bytesWritten, 1, 'respond');\n    bytesWritten = convertUnsignedLongLongWithEnforceRange(bytesWritten, 'First parameter');\n\n    if (this._associatedReadableByteStreamController === undefined) {\n      throw new TypeError('This BYOB request has been invalidated');\n    }\n\n    if (IsDetachedBuffer(this._view!.buffer)) {\n      throw new TypeError(`The BYOB request's buffer has been detached and so cannot be used as a response`);\n    }\n\n    assert(this._view!.byteLength > 0);\n    assert(this._view!.buffer.byteLength > 0);\n\n    ReadableByteStreamControllerRespond(this._associatedReadableByteStreamController, bytesWritten);\n  }\n\n  /**\n   * Indicates to the associated readable byte stream that instead of writing into\n   * {@link ReadableStreamBYOBRequest.view | view}, the underlying byte source is providing a new `ArrayBufferView`,\n   * which will be given to the consumer of the readable byte stream.\n   *\n   * After this method is called, `view` will be transferred and no longer modifiable.\n   */\n  respondWithNewView(view: ArrayBufferView): void;\n  respondWithNewView(view: ArrayBufferView | undefined): void {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('respondWithNewView');\n    }\n    assertRequiredArgument(view, 1, 'respondWithNewView');\n\n    if (!ArrayBuffer.isView(view)) {\n      throw new TypeError('You can only respond with array buffer views');\n    }\n\n    if (this._associatedReadableByteStreamController === undefined) {\n      throw new TypeError('This BYOB request has been invalidated');\n    }\n\n    if (IsDetachedBuffer(view.buffer)) {\n      throw new TypeError('The given view\\'s buffer has been detached and so cannot be used as a response');\n    }\n\n    ReadableByteStreamControllerRespondWithNewView(this._associatedReadableByteStreamController, view);\n  }\n}\n\nObject.defineProperties(ReadableStreamBYOBRequest.prototype, {\n  respond: { enumerable: true },\n  respondWithNewView: { enumerable: true },\n  view: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamBYOBRequest.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamBYOBRequest',\n    configurable: true\n  });\n}\n\ninterface ArrayBufferViewConstructor<T extends ArrayBufferView = ArrayBufferView> {\n  new(buffer: ArrayBufferLike, byteOffset: number, length?: number): T;\n\n  readonly prototype: T;\n  readonly BYTES_PER_ELEMENT: number;\n}\n\ninterface ByteQueueElement {\n  buffer: ArrayBufferLike;\n  byteOffset: number;\n  byteLength: number;\n}\n\ntype PullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> =\n  DefaultPullIntoDescriptor\n  | BYOBPullIntoDescriptor<T>;\n\ninterface DefaultPullIntoDescriptor {\n  buffer: ArrayBufferLike;\n  bufferByteLength: number;\n  byteOffset: number;\n  byteLength: number;\n  bytesFilled: number;\n  elementSize: number;\n  viewConstructor: ArrayBufferViewConstructor<Uint8Array>;\n  readerType: 'default';\n}\n\ninterface BYOBPullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> {\n  buffer: ArrayBufferLike;\n  bufferByteLength: number;\n  byteOffset: number;\n  byteLength: number;\n  bytesFilled: number;\n  elementSize: number;\n  viewConstructor: ArrayBufferViewConstructor<T>;\n  readerType: 'byob';\n}\n\n/**\n * Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue.\n *\n * @public\n */\nexport class ReadableByteStreamController {\n  /** @internal */\n  _controlledReadableByteStream!: ReadableByteStream;\n  /** @internal */\n  _queue!: SimpleQueue<ByteQueueElement>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _closeRequested!: boolean;\n  /** @internal */\n  _pullAgain!: boolean;\n  /** @internal */\n  _pulling !: boolean;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _pullAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _cancelAlgorithm!: (reason: any) => Promise<void>;\n  /** @internal */\n  _autoAllocateChunkSize: number | undefined;\n  /** @internal */\n  _byobRequest: ReadableStreamBYOBRequest | null;\n  /** @internal */\n  _pendingPullIntos!: SimpleQueue<PullIntoDescriptor>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the current BYOB pull request, or `null` if there isn't one.\n   */\n  get byobRequest(): ReadableStreamBYOBRequest | null {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('byobRequest');\n    }\n\n    return ReadableByteStreamControllerGetBYOBRequest(this);\n  }\n\n  /**\n   * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is\n   * over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure.\n   */\n  get desiredSize(): number | null {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('desiredSize');\n    }\n\n    return ReadableByteStreamControllerGetDesiredSize(this);\n  }\n\n  /**\n   * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from\n   * the stream, but once those are read, the stream will become closed.\n   */\n  close(): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('close');\n    }\n\n    if (this._closeRequested) {\n      throw new TypeError('The stream has already been closed; do not close it again!');\n    }\n\n    const state = this._controlledReadableByteStream._state;\n    if (state !== 'readable') {\n      throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be closed`);\n    }\n\n    ReadableByteStreamControllerClose(this);\n  }\n\n  /**\n   * Enqueues the given chunk chunk in the controlled readable stream.\n   * The chunk has to be an `ArrayBufferView` instance, or else a `TypeError` will be thrown.\n   */\n  enqueue(chunk: ArrayBufferView): void;\n  enqueue(chunk: ArrayBufferView | undefined): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('enqueue');\n    }\n\n    assertRequiredArgument(chunk, 1, 'enqueue');\n    if (!ArrayBuffer.isView(chunk)) {\n      throw new TypeError('chunk must be an array buffer view');\n    }\n    if (chunk.byteLength === 0) {\n      throw new TypeError('chunk must have non-zero byteLength');\n    }\n    if (chunk.buffer.byteLength === 0) {\n      throw new TypeError(`chunk's buffer must have non-zero byteLength`);\n    }\n\n    if (this._closeRequested) {\n      throw new TypeError('stream is closed or draining');\n    }\n\n    const state = this._controlledReadableByteStream._state;\n    if (state !== 'readable') {\n      throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be enqueued to`);\n    }\n\n    ReadableByteStreamControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.\n   */\n  error(e: any = undefined): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('error');\n    }\n\n    ReadableByteStreamControllerError(this, e);\n  }\n\n  /** @internal */\n  [CancelSteps](reason: any): Promise<void> {\n    ReadableByteStreamControllerClearPendingPullIntos(this);\n\n    ResetQueue(this);\n\n    const result = this._cancelAlgorithm(reason);\n    ReadableByteStreamControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [PullSteps](readRequest: ReadRequest<Uint8Array>): void {\n    const stream = this._controlledReadableByteStream;\n    assert(ReadableStreamHasDefaultReader(stream));\n\n    if (this._queueTotalSize > 0) {\n      assert(ReadableStreamGetNumReadRequests(stream) === 0);\n\n      const entry = this._queue.shift()!;\n      this._queueTotalSize -= entry.byteLength;\n\n      ReadableByteStreamControllerHandleQueueDrain(this);\n\n      const view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);\n\n      readRequest._chunkSteps(view);\n      return;\n    }\n\n    const autoAllocateChunkSize = this._autoAllocateChunkSize;\n    if (autoAllocateChunkSize !== undefined) {\n      let buffer: ArrayBuffer;\n      try {\n        buffer = new ArrayBuffer(autoAllocateChunkSize);\n      } catch (bufferE) {\n        readRequest._errorSteps(bufferE);\n        return;\n      }\n\n      const pullIntoDescriptor: DefaultPullIntoDescriptor = {\n        buffer,\n        bufferByteLength: autoAllocateChunkSize,\n        byteOffset: 0,\n        byteLength: autoAllocateChunkSize,\n        bytesFilled: 0,\n        elementSize: 1,\n        viewConstructor: Uint8Array,\n        readerType: 'default'\n      };\n\n      this._pendingPullIntos.push(pullIntoDescriptor);\n    }\n\n    ReadableStreamAddReadRequest(stream, readRequest);\n    ReadableByteStreamControllerCallPullIfNeeded(this);\n  }\n}\n\nObject.defineProperties(ReadableByteStreamController.prototype, {\n  close: { enumerable: true },\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  byobRequest: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableByteStreamController.prototype, Symbol.toStringTag, {\n    value: 'ReadableByteStreamController',\n    configurable: true\n  });\n}\n\n// Abstract operations for the ReadableByteStreamController.\n\nexport function IsReadableByteStreamController(x: any): x is ReadableByteStreamController {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableByteStream')) {\n    return false;\n  }\n\n  return x instanceof ReadableByteStreamController;\n}\n\nfunction IsReadableStreamBYOBRequest(x: any): x is ReadableStreamBYOBRequest {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_associatedReadableByteStreamController')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamBYOBRequest;\n}\n\nfunction ReadableByteStreamControllerCallPullIfNeeded(controller: ReadableByteStreamController): void {\n  const shouldPull = ReadableByteStreamControllerShouldCallPull(controller);\n  if (!shouldPull) {\n    return;\n  }\n\n  if (controller._pulling) {\n    controller._pullAgain = true;\n    return;\n  }\n\n  assert(!controller._pullAgain);\n\n  controller._pulling = true;\n\n  // TODO: Test controller argument\n  const pullPromise = controller._pullAlgorithm();\n  uponPromise(\n    pullPromise,\n    () => {\n      controller._pulling = false;\n\n      if (controller._pullAgain) {\n        controller._pullAgain = false;\n        ReadableByteStreamControllerCallPullIfNeeded(controller);\n      }\n    },\n    e => {\n      ReadableByteStreamControllerError(controller, e);\n    }\n  );\n}\n\nfunction ReadableByteStreamControllerClearPendingPullIntos(controller: ReadableByteStreamController) {\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n  controller._pendingPullIntos = new SimpleQueue();\n}\n\nfunction ReadableByteStreamControllerCommitPullIntoDescriptor<T extends ArrayBufferView>(\n  stream: ReadableByteStream,\n  pullIntoDescriptor: PullIntoDescriptor<T>\n) {\n  assert(stream._state !== 'errored');\n\n  let done = false;\n  if (stream._state === 'closed') {\n    assert(pullIntoDescriptor.bytesFilled === 0);\n    done = true;\n  }\n\n  const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);\n  if (pullIntoDescriptor.readerType === 'default') {\n    ReadableStreamFulfillReadRequest(stream, filledView as unknown as Uint8Array, done);\n  } else {\n    assert(pullIntoDescriptor.readerType === 'byob');\n    ReadableStreamFulfillReadIntoRequest(stream, filledView, done);\n  }\n}\n\nfunction ReadableByteStreamControllerConvertPullIntoDescriptor<T extends ArrayBufferView>(\n  pullIntoDescriptor: PullIntoDescriptor<T>\n): T {\n  const bytesFilled = pullIntoDescriptor.bytesFilled;\n  const elementSize = pullIntoDescriptor.elementSize;\n\n  assert(bytesFilled <= pullIntoDescriptor.byteLength);\n  assert(bytesFilled % elementSize === 0);\n\n  return new pullIntoDescriptor.viewConstructor(\n    pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize) as T;\n}\n\nfunction ReadableByteStreamControllerEnqueueChunkToQueue(controller: ReadableByteStreamController,\n                                                         buffer: ArrayBufferLike,\n                                                         byteOffset: number,\n                                                         byteLength: number) {\n  controller._queue.push({ buffer, byteOffset, byteLength });\n  controller._queueTotalSize += byteLength;\n}\n\nfunction ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller: ReadableByteStreamController,\n                                                                     pullIntoDescriptor: PullIntoDescriptor) {\n  const elementSize = pullIntoDescriptor.elementSize;\n\n  const currentAlignedBytes = pullIntoDescriptor.bytesFilled - pullIntoDescriptor.bytesFilled % elementSize;\n\n  const maxBytesToCopy = Math.min(controller._queueTotalSize,\n                                  pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled);\n  const maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;\n  const maxAlignedBytes = maxBytesFilled - maxBytesFilled % elementSize;\n\n  let totalBytesToCopyRemaining = maxBytesToCopy;\n  let ready = false;\n  if (maxAlignedBytes > currentAlignedBytes) {\n    totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled;\n    ready = true;\n  }\n\n  const queue = controller._queue;\n\n  while (totalBytesToCopyRemaining > 0) {\n    const headOfQueue = queue.peek();\n\n    const bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength);\n\n    const destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n    CopyDataBlockBytes(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy);\n\n    if (headOfQueue.byteLength === bytesToCopy) {\n      queue.shift();\n    } else {\n      headOfQueue.byteOffset += bytesToCopy;\n      headOfQueue.byteLength -= bytesToCopy;\n    }\n    controller._queueTotalSize -= bytesToCopy;\n\n    ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor);\n\n    totalBytesToCopyRemaining -= bytesToCopy;\n  }\n\n  if (!ready) {\n    assert(controller._queueTotalSize === 0);\n    assert(pullIntoDescriptor.bytesFilled > 0);\n    assert(pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize);\n  }\n\n  return ready;\n}\n\nfunction ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller: ReadableByteStreamController,\n                                                                size: number,\n                                                                pullIntoDescriptor: PullIntoDescriptor) {\n  assert(controller._pendingPullIntos.length === 0 || controller._pendingPullIntos.peek() === pullIntoDescriptor);\n  assert(controller._byobRequest === null);\n  pullIntoDescriptor.bytesFilled += size;\n}\n\nfunction ReadableByteStreamControllerHandleQueueDrain(controller: ReadableByteStreamController) {\n  assert(controller._controlledReadableByteStream._state === 'readable');\n\n  if (controller._queueTotalSize === 0 && controller._closeRequested) {\n    ReadableByteStreamControllerClearAlgorithms(controller);\n    ReadableStreamClose(controller._controlledReadableByteStream);\n  } else {\n    ReadableByteStreamControllerCallPullIfNeeded(controller);\n  }\n}\n\nfunction ReadableByteStreamControllerInvalidateBYOBRequest(controller: ReadableByteStreamController) {\n  if (controller._byobRequest === null) {\n    return;\n  }\n\n  controller._byobRequest._associatedReadableByteStreamController = undefined!;\n  controller._byobRequest._view = null!;\n  controller._byobRequest = null;\n}\n\nfunction ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller: ReadableByteStreamController) {\n  assert(!controller._closeRequested);\n\n  while (controller._pendingPullIntos.length > 0) {\n    if (controller._queueTotalSize === 0) {\n      return;\n    }\n\n    const pullIntoDescriptor = controller._pendingPullIntos.peek();\n\n    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {\n      ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n      ReadableByteStreamControllerCommitPullIntoDescriptor(\n        controller._controlledReadableByteStream,\n        pullIntoDescriptor\n      );\n    }\n  }\n}\n\nexport function ReadableByteStreamControllerPullInto<T extends ArrayBufferView>(\n  controller: ReadableByteStreamController,\n  view: T,\n  readIntoRequest: ReadIntoRequest<T>\n): void {\n  const stream = controller._controlledReadableByteStream;\n\n  let elementSize = 1;\n  if (view.constructor !== DataView) {\n    elementSize = (view.constructor as ArrayBufferViewConstructor<T>).BYTES_PER_ELEMENT;\n  }\n\n  const ctor = view.constructor as ArrayBufferViewConstructor<T>;\n\n  // try {\n  const buffer = TransferArrayBuffer(view.buffer);\n  // } catch (e) {\n  //   readIntoRequest._errorSteps(e);\n  //   return;\n  // }\n\n  const pullIntoDescriptor: BYOBPullIntoDescriptor<T> = {\n    buffer,\n    bufferByteLength: buffer.byteLength,\n    byteOffset: view.byteOffset,\n    byteLength: view.byteLength,\n    bytesFilled: 0,\n    elementSize,\n    viewConstructor: ctor,\n    readerType: 'byob'\n  };\n\n  if (controller._pendingPullIntos.length > 0) {\n    controller._pendingPullIntos.push(pullIntoDescriptor);\n\n    // No ReadableByteStreamControllerCallPullIfNeeded() call since:\n    // - No change happens on desiredSize\n    // - The source has already been notified of that there's at least 1 pending read(view)\n\n    ReadableStreamAddReadIntoRequest(stream, readIntoRequest);\n    return;\n  }\n\n  if (stream._state === 'closed') {\n    const emptyView = new ctor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0);\n    readIntoRequest._closeSteps(emptyView);\n    return;\n  }\n\n  if (controller._queueTotalSize > 0) {\n    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {\n      const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);\n\n      ReadableByteStreamControllerHandleQueueDrain(controller);\n\n      readIntoRequest._chunkSteps(filledView);\n      return;\n    }\n\n    if (controller._closeRequested) {\n      const e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n      ReadableByteStreamControllerError(controller, e);\n\n      readIntoRequest._errorSteps(e);\n      return;\n    }\n  }\n\n  controller._pendingPullIntos.push(pullIntoDescriptor);\n\n  ReadableStreamAddReadIntoRequest<T>(stream, readIntoRequest);\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nfunction ReadableByteStreamControllerRespondInClosedState(controller: ReadableByteStreamController,\n                                                          firstDescriptor: PullIntoDescriptor) {\n  assert(firstDescriptor.bytesFilled === 0);\n\n  const stream = controller._controlledReadableByteStream;\n  if (ReadableStreamHasBYOBReader(stream)) {\n    while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n      const pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);\n      ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);\n    }\n  }\n}\n\nfunction ReadableByteStreamControllerRespondInReadableState(controller: ReadableByteStreamController,\n                                                            bytesWritten: number,\n                                                            pullIntoDescriptor: PullIntoDescriptor) {\n  assert(pullIntoDescriptor.bytesFilled + bytesWritten <= pullIntoDescriptor.byteLength);\n\n  ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor);\n\n  if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {\n    return;\n  }\n\n  ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n  const remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize;\n  if (remainderSize > 0) {\n    const end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n    const remainder = ArrayBufferSlice(pullIntoDescriptor.buffer, end - remainderSize, end);\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength);\n  }\n\n  pullIntoDescriptor.bytesFilled -= remainderSize;\n  ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);\n\n  ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n}\n\nfunction ReadableByteStreamControllerRespondInternal(controller: ReadableByteStreamController, bytesWritten: number) {\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  assert(CanTransferArrayBuffer(firstDescriptor.buffer));\n\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n\n  const state = controller._controlledReadableByteStream._state;\n  if (state === 'closed') {\n    assert(bytesWritten === 0);\n    ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor);\n  } else {\n    assert(state === 'readable');\n    assert(bytesWritten > 0);\n    ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);\n  }\n\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nfunction ReadableByteStreamControllerShiftPendingPullInto(\n  controller: ReadableByteStreamController\n): PullIntoDescriptor {\n  assert(controller._byobRequest === null);\n  const descriptor = controller._pendingPullIntos.shift()!;\n  return descriptor;\n}\n\nfunction ReadableByteStreamControllerShouldCallPull(controller: ReadableByteStreamController): boolean {\n  const stream = controller._controlledReadableByteStream;\n\n  if (stream._state !== 'readable') {\n    return false;\n  }\n\n  if (controller._closeRequested) {\n    return false;\n  }\n\n  if (!controller._started) {\n    return false;\n  }\n\n  if (ReadableStreamHasDefaultReader(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    return true;\n  }\n\n  if (ReadableStreamHasBYOBReader(stream) && ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n    return true;\n  }\n\n  const desiredSize = ReadableByteStreamControllerGetDesiredSize(controller);\n  assert(desiredSize !== null);\n  if (desiredSize! > 0) {\n    return true;\n  }\n\n  return false;\n}\n\nfunction ReadableByteStreamControllerClearAlgorithms(controller: ReadableByteStreamController) {\n  controller._pullAlgorithm = undefined!;\n  controller._cancelAlgorithm = undefined!;\n}\n\n// A client of ReadableByteStreamController may use these functions directly to bypass state check.\n\nexport function ReadableByteStreamControllerClose(controller: ReadableByteStreamController) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (controller._closeRequested || stream._state !== 'readable') {\n    return;\n  }\n\n  if (controller._queueTotalSize > 0) {\n    controller._closeRequested = true;\n\n    return;\n  }\n\n  if (controller._pendingPullIntos.length > 0) {\n    const firstPendingPullInto = controller._pendingPullIntos.peek();\n    if (firstPendingPullInto.bytesFilled > 0) {\n      const e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n      ReadableByteStreamControllerError(controller, e);\n\n      throw e;\n    }\n  }\n\n  ReadableByteStreamControllerClearAlgorithms(controller);\n  ReadableStreamClose(stream);\n}\n\nexport function ReadableByteStreamControllerEnqueue(controller: ReadableByteStreamController, chunk: ArrayBufferView) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (controller._closeRequested || stream._state !== 'readable') {\n    return;\n  }\n\n  const buffer = chunk.buffer;\n  const byteOffset = chunk.byteOffset;\n  const byteLength = chunk.byteLength;\n  if (IsDetachedBuffer(buffer)) {\n    throw new TypeError('chunk\\'s buffer is detached and so cannot be enqueued');\n  }\n  const transferredBuffer = TransferArrayBuffer(buffer);\n\n  if (controller._pendingPullIntos.length > 0) {\n    const firstPendingPullInto = controller._pendingPullIntos.peek();\n    if (IsDetachedBuffer(firstPendingPullInto.buffer)) {\n      throw new TypeError(\n        'The BYOB request\\'s buffer has been detached and so cannot be filled with an enqueued chunk'\n      );\n    }\n    firstPendingPullInto.buffer = TransferArrayBuffer(firstPendingPullInto.buffer);\n  }\n\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n\n  if (ReadableStreamHasDefaultReader(stream)) {\n    if (ReadableStreamGetNumReadRequests(stream) === 0) {\n      assert(controller._pendingPullIntos.length === 0);\n      ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n    } else {\n      assert(controller._queue.length === 0);\n      if (controller._pendingPullIntos.length > 0) {\n        assert(controller._pendingPullIntos.peek().readerType === 'default');\n        ReadableByteStreamControllerShiftPendingPullInto(controller);\n      }\n      const transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength);\n      ReadableStreamFulfillReadRequest(stream, transferredView, false);\n    }\n  } else if (ReadableStreamHasBYOBReader(stream)) {\n    // TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully.\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n    ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n  } else {\n    assert(!IsReadableStreamLocked(stream));\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n  }\n\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nexport function ReadableByteStreamControllerError(controller: ReadableByteStreamController, e: any) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (stream._state !== 'readable') {\n    return;\n  }\n\n  ReadableByteStreamControllerClearPendingPullIntos(controller);\n\n  ResetQueue(controller);\n  ReadableByteStreamControllerClearAlgorithms(controller);\n  ReadableStreamError(stream, e);\n}\n\nexport function ReadableByteStreamControllerGetBYOBRequest(\n  controller: ReadableByteStreamController\n): ReadableStreamBYOBRequest | null {\n  if (controller._byobRequest === null && controller._pendingPullIntos.length > 0) {\n    const firstDescriptor = controller._pendingPullIntos.peek();\n    const view = new Uint8Array(firstDescriptor.buffer,\n                                firstDescriptor.byteOffset + firstDescriptor.bytesFilled,\n                                firstDescriptor.byteLength - firstDescriptor.bytesFilled);\n\n    const byobRequest: ReadableStreamBYOBRequest = Object.create(ReadableStreamBYOBRequest.prototype);\n    SetUpReadableStreamBYOBRequest(byobRequest, controller, view);\n    controller._byobRequest = byobRequest;\n  }\n  return controller._byobRequest;\n}\n\nfunction ReadableByteStreamControllerGetDesiredSize(controller: ReadableByteStreamController): number | null {\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'errored') {\n    return null;\n  }\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\nexport function ReadableByteStreamControllerRespond(controller: ReadableByteStreamController, bytesWritten: number) {\n  assert(controller._pendingPullIntos.length > 0);\n\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'closed') {\n    if (bytesWritten !== 0) {\n      throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream');\n    }\n  } else {\n    assert(state === 'readable');\n    if (bytesWritten === 0) {\n      throw new TypeError('bytesWritten must be greater than 0 when calling respond() on a readable stream');\n    }\n    if (firstDescriptor.bytesFilled + bytesWritten > firstDescriptor.byteLength) {\n      throw new RangeError('bytesWritten out of range');\n    }\n  }\n\n  firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer);\n\n  ReadableByteStreamControllerRespondInternal(controller, bytesWritten);\n}\n\nexport function ReadableByteStreamControllerRespondWithNewView(controller: ReadableByteStreamController,\n                                                               view: ArrayBufferView) {\n  assert(controller._pendingPullIntos.length > 0);\n  assert(!IsDetachedBuffer(view.buffer));\n\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'closed') {\n    if (view.byteLength !== 0) {\n      throw new TypeError('The view\\'s length must be 0 when calling respondWithNewView() on a closed stream');\n    }\n  } else {\n    assert(state === 'readable');\n    if (view.byteLength === 0) {\n      throw new TypeError(\n        'The view\\'s length must be greater than 0 when calling respondWithNewView() on a readable stream'\n      );\n    }\n  }\n\n  if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) {\n    throw new RangeError('The region specified by view does not match byobRequest');\n  }\n  if (firstDescriptor.bufferByteLength !== view.buffer.byteLength) {\n    throw new RangeError('The buffer of view has different capacity than byobRequest');\n  }\n  if (firstDescriptor.bytesFilled + view.byteLength > firstDescriptor.byteLength) {\n    throw new RangeError('The region specified by view is larger than byobRequest');\n  }\n\n  const viewByteLength = view.byteLength;\n  firstDescriptor.buffer = TransferArrayBuffer(view.buffer);\n  ReadableByteStreamControllerRespondInternal(controller, viewByteLength);\n}\n\nexport function SetUpReadableByteStreamController(stream: ReadableByteStream,\n                                                  controller: ReadableByteStreamController,\n                                                  startAlgorithm: () => void | PromiseLike<void>,\n                                                  pullAlgorithm: () => Promise<void>,\n                                                  cancelAlgorithm: (reason: any) => Promise<void>,\n                                                  highWaterMark: number,\n                                                  autoAllocateChunkSize: number | undefined) {\n  assert(stream._readableStreamController === undefined);\n  if (autoAllocateChunkSize !== undefined) {\n    assert(NumberIsInteger(autoAllocateChunkSize));\n    assert(autoAllocateChunkSize > 0);\n  }\n\n  controller._controlledReadableByteStream = stream;\n\n  controller._pullAgain = false;\n  controller._pulling = false;\n\n  controller._byobRequest = null;\n\n  // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n  controller._queue = controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._closeRequested = false;\n  controller._started = false;\n\n  controller._strategyHWM = highWaterMark;\n\n  controller._pullAlgorithm = pullAlgorithm;\n  controller._cancelAlgorithm = cancelAlgorithm;\n\n  controller._autoAllocateChunkSize = autoAllocateChunkSize;\n\n  controller._pendingPullIntos = new SimpleQueue();\n\n  stream._readableStreamController = controller;\n\n  const startResult = startAlgorithm();\n  uponPromise(\n    promiseResolvedWith(startResult),\n    () => {\n      controller._started = true;\n\n      assert(!controller._pulling);\n      assert(!controller._pullAgain);\n\n      ReadableByteStreamControllerCallPullIfNeeded(controller);\n    },\n    r => {\n      ReadableByteStreamControllerError(controller, r);\n    }\n  );\n}\n\nexport function SetUpReadableByteStreamControllerFromUnderlyingSource(\n  stream: ReadableByteStream,\n  underlyingByteSource: ValidatedUnderlyingByteSource,\n  highWaterMark: number\n) {\n  const controller: ReadableByteStreamController = Object.create(ReadableByteStreamController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let pullAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let cancelAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingByteSource.start !== undefined) {\n    startAlgorithm = () => underlyingByteSource.start!(controller);\n  }\n  if (underlyingByteSource.pull !== undefined) {\n    pullAlgorithm = () => underlyingByteSource.pull!(controller);\n  }\n  if (underlyingByteSource.cancel !== undefined) {\n    cancelAlgorithm = reason => underlyingByteSource.cancel!(reason);\n  }\n\n  const autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;\n  if (autoAllocateChunkSize === 0) {\n    throw new TypeError('autoAllocateChunkSize must be greater than 0');\n  }\n\n  SetUpReadableByteStreamController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize\n  );\n}\n\nfunction SetUpReadableStreamBYOBRequest(request: ReadableStreamBYOBRequest,\n                                        controller: ReadableByteStreamController,\n                                        view: ArrayBufferView) {\n  assert(IsReadableByteStreamController(controller));\n  assert(typeof view === 'object');\n  assert(ArrayBuffer.isView(view));\n  assert(!IsDetachedBuffer(view.buffer));\n  request._associatedReadableByteStreamController = controller;\n  request._view = view;\n}\n\n// Helper functions for the ReadableStreamBYOBRequest.\n\nfunction byobRequestBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamBYOBRequest.prototype.${name} can only be used on a ReadableStreamBYOBRequest`);\n}\n\n// Helper functions for the ReadableByteStreamController.\n\nfunction byteStreamControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableByteStreamController.prototype.${name} can only be used on a ReadableByteStreamController`);\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericInitialize,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport { IsReadableStreamLocked, ReadableByteStream, ReadableStream } from '../readable-stream';\nimport {\n  IsReadableByteStreamController,\n  ReadableByteStreamController,\n  ReadableByteStreamControllerPullInto\n} from './byte-stream-controller';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { newPromise, promiseRejectedWith } from '../helpers/webidl';\nimport { assertRequiredArgument } from '../validators/basic';\nimport { assertReadableStream } from '../validators/readable-stream';\nimport { IsDetachedBuffer } from '../abstract-ops/ecmascript';\n\n/**\n * A result returned by {@link ReadableStreamBYOBReader.read}.\n *\n * @public\n */\nexport type ReadableStreamBYOBReadResult<T extends ArrayBufferView> = {\n  done: false;\n  value: T;\n} | {\n  done: true;\n  value: T | undefined;\n};\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamBYOBReader(stream: ReadableByteStream): ReadableStreamBYOBReader {\n  return new ReadableStreamBYOBReader(stream);\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamAddReadIntoRequest<T extends ArrayBufferView>(stream: ReadableByteStream,\n                                                                            readIntoRequest: ReadIntoRequest<T>): void {\n  assert(IsReadableStreamBYOBReader(stream._reader));\n  assert(stream._state === 'readable' || stream._state === 'closed');\n\n  (stream._reader! as ReadableStreamBYOBReader)._readIntoRequests.push(readIntoRequest);\n}\n\nexport function ReadableStreamFulfillReadIntoRequest(stream: ReadableByteStream,\n                                                     chunk: ArrayBufferView,\n                                                     done: boolean) {\n  const reader = stream._reader as ReadableStreamBYOBReader;\n\n  assert(reader._readIntoRequests.length > 0);\n\n  const readIntoRequest = reader._readIntoRequests.shift()!;\n  if (done) {\n    readIntoRequest._closeSteps(chunk);\n  } else {\n    readIntoRequest._chunkSteps(chunk);\n  }\n}\n\nexport function ReadableStreamGetNumReadIntoRequests(stream: ReadableByteStream): number {\n  return (stream._reader as ReadableStreamBYOBReader)._readIntoRequests.length;\n}\n\nexport function ReadableStreamHasBYOBReader(stream: ReadableByteStream): boolean {\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return false;\n  }\n\n  if (!IsReadableStreamBYOBReader(reader)) {\n    return false;\n  }\n\n  return true;\n}\n\n// Readers\n\nexport interface ReadIntoRequest<T extends ArrayBufferView> {\n  _chunkSteps(chunk: T): void;\n\n  _closeSteps(chunk: T | undefined): void;\n\n  _errorSteps(e: any): void;\n}\n\n/**\n * A BYOB reader vended by a {@link ReadableStream}.\n *\n * @public\n */\nexport class ReadableStreamBYOBReader {\n  /** @internal */\n  _ownerReadableStream!: ReadableByteStream;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readIntoRequests: SimpleQueue<ReadIntoRequest<any>>;\n\n  constructor(stream: ReadableByteStream) {\n    assertRequiredArgument(stream, 1, 'ReadableStreamBYOBReader');\n    assertReadableStream(stream, 'First parameter');\n\n    if (IsReadableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n    }\n\n    if (!IsReadableByteStreamController(stream._readableStreamController)) {\n      throw new TypeError('Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte ' +\n        'source');\n    }\n\n    ReadableStreamReaderGenericInitialize(this, stream);\n\n    this._readIntoRequests = new SimpleQueue();\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or\n   * the reader's lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('cancel'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('cancel'));\n    }\n\n    return ReadableStreamReaderGenericCancel(this, reason);\n  }\n\n  /**\n   * Attempts to reads bytes into view, and returns a promise resolved with the result.\n   *\n   * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.\n   */\n  read<T extends ArrayBufferView>(view: T): Promise<ReadableStreamBYOBReadResult<T>> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('read'));\n    }\n\n    if (!ArrayBuffer.isView(view)) {\n      return promiseRejectedWith(new TypeError('view must be an array buffer view'));\n    }\n    if (view.byteLength === 0) {\n      return promiseRejectedWith(new TypeError('view must have non-zero byteLength'));\n    }\n    if (view.buffer.byteLength === 0) {\n      return promiseRejectedWith(new TypeError(`view's buffer must have non-zero byteLength`));\n    }\n    if (IsDetachedBuffer(view.buffer)) {\n      return promiseRejectedWith(new TypeError('view\\'s buffer has been detached'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('read from'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamBYOBReadResult<T>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamBYOBReadResult<T>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readIntoRequest: ReadIntoRequest<T> = {\n      _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),\n      _closeSteps: chunk => resolvePromise({ value: chunk, done: true }),\n      _errorSteps: e => rejectPromise(e)\n    };\n    ReadableStreamBYOBReaderRead(this, view, readIntoRequest);\n    return promise;\n  }\n\n  /**\n   * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.\n   * If the associated stream is errored when the lock is released, the reader will appear errored in the same way\n   * from now on; otherwise, the reader will appear closed.\n   *\n   * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by\n   * the reader's {@link ReadableStreamBYOBReader.read | read()} method has not yet been settled. Attempting to\n   * do so will throw a `TypeError` and leave the reader locked to the stream.\n   */\n  releaseLock(): void {\n    if (!IsReadableStreamBYOBReader(this)) {\n      throw byobReaderBrandCheckException('releaseLock');\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return;\n    }\n\n    if (this._readIntoRequests.length > 0) {\n      throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n    }\n\n    ReadableStreamReaderGenericRelease(this);\n  }\n}\n\nObject.defineProperties(ReadableStreamBYOBReader.prototype, {\n  cancel: { enumerable: true },\n  read: { enumerable: true },\n  releaseLock: { enumerable: true },\n  closed: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamBYOBReader.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamBYOBReader',\n    configurable: true\n  });\n}\n\n// Abstract operations for the readers.\n\nexport function IsReadableStreamBYOBReader(x: any): x is ReadableStreamBYOBReader {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readIntoRequests')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamBYOBReader;\n}\n\nexport function ReadableStreamBYOBReaderRead<T extends ArrayBufferView>(\n  reader: ReadableStreamBYOBReader,\n  view: T,\n  readIntoRequest: ReadIntoRequest<T>\n): void {\n  const stream = reader._ownerReadableStream;\n\n  assert(stream !== undefined);\n\n  stream._disturbed = true;\n\n  if (stream._state === 'errored') {\n    readIntoRequest._errorSteps(stream._storedError);\n  } else {\n    ReadableByteStreamControllerPullInto(\n      stream._readableStreamController as ReadableByteStreamController,\n      view,\n      readIntoRequest\n    );\n  }\n}\n\n// Helper functions for the ReadableStreamBYOBReader.\n\nfunction byobReaderBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamBYOBReader.prototype.${name} can only be used on a ReadableStreamBYOBReader`);\n}\n","import { QueuingStrategy, QueuingStrategySizeCallback } from '../queuing-strategy';\nimport NumberIsNaN from '../../stub/number-isnan';\n\nexport function ExtractHighWaterMark(strategy: QueuingStrategy, defaultHWM: number): number {\n  const { highWaterMark } = strategy;\n\n  if (highWaterMark === undefined) {\n    return defaultHWM;\n  }\n\n  if (NumberIsNaN(highWaterMark) || highWaterMark < 0) {\n    throw new RangeError('Invalid highWaterMark');\n  }\n\n  return highWaterMark;\n}\n\nexport function ExtractSizeAlgorithm<T>(strategy: QueuingStrategy<T>): QueuingStrategySizeCallback<T> {\n  const { size } = strategy;\n\n  if (!size) {\n    return () => 1;\n  }\n\n  return size;\n}\n","import { QueuingStrategy, QueuingStrategySizeCallback } from '../queuing-strategy';\nimport { assertDictionary, assertFunction, convertUnrestrictedDouble } from './basic';\n\nexport function convertQueuingStrategy<T>(init: QueuingStrategy<T> | null | undefined,\n                                          context: string): QueuingStrategy<T> {\n  assertDictionary(init, context);\n  const highWaterMark = init?.highWaterMark;\n  const size = init?.size;\n  return {\n    highWaterMark: highWaterMark === undefined ? undefined : convertUnrestrictedDouble(highWaterMark),\n    size: size === undefined ? undefined : convertQueuingStrategySize(size, `${context} has member 'size' that`)\n  };\n}\n\nfunction convertQueuingStrategySize<T>(fn: QueuingStrategySizeCallback<T>,\n                                       context: string): QueuingStrategySizeCallback<T> {\n  assertFunction(fn, context);\n  return chunk => convertUnrestrictedDouble(fn(chunk));\n}\n","import { assertDictionary, assertFunction } from './basic';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\nimport {\n  UnderlyingSink,\n  UnderlyingSinkAbortCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  ValidatedUnderlyingSink\n} from '../writable-stream/underlying-sink';\nimport { WritableStreamDefaultController } from '../writable-stream';\n\nexport function convertUnderlyingSink<W>(original: UnderlyingSink<W> | null,\n                                         context: string): ValidatedUnderlyingSink<W> {\n  assertDictionary(original, context);\n  const abort = original?.abort;\n  const close = original?.close;\n  const start = original?.start;\n  const type = original?.type;\n  const write = original?.write;\n  return {\n    abort: abort === undefined ?\n      undefined :\n      convertUnderlyingSinkAbortCallback(abort, original!, `${context} has member 'abort' that`),\n    close: close === undefined ?\n      undefined :\n      convertUnderlyingSinkCloseCallback(close, original!, `${context} has member 'close' that`),\n    start: start === undefined ?\n      undefined :\n      convertUnderlyingSinkStartCallback(start, original!, `${context} has member 'start' that`),\n    write: write === undefined ?\n      undefined :\n      convertUnderlyingSinkWriteCallback(write, original!, `${context} has member 'write' that`),\n    type\n  };\n}\n\nfunction convertUnderlyingSinkAbortCallback(\n  fn: UnderlyingSinkAbortCallback,\n  original: UnderlyingSink,\n  context: string\n): (reason: any) => Promise<void> {\n  assertFunction(fn, context);\n  return (reason: any) => promiseCall(fn, original, [reason]);\n}\n\nfunction convertUnderlyingSinkCloseCallback(\n  fn: UnderlyingSinkCloseCallback,\n  original: UnderlyingSink,\n  context: string\n): () => Promise<void> {\n  assertFunction(fn, context);\n  return () => promiseCall(fn, original, []);\n}\n\nfunction convertUnderlyingSinkStartCallback(\n  fn: UnderlyingSinkStartCallback,\n  original: UnderlyingSink,\n  context: string\n): UnderlyingSinkStartCallback {\n  assertFunction(fn, context);\n  return (controller: WritableStreamDefaultController) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertUnderlyingSinkWriteCallback<W>(\n  fn: UnderlyingSinkWriteCallback<W>,\n  original: UnderlyingSink<W>,\n  context: string\n): (chunk: W, controller: WritableStreamDefaultController) => Promise<void> {\n  assertFunction(fn, context);\n  return (chunk: W, controller: WritableStreamDefaultController) => promiseCall(fn, original, [chunk, controller]);\n}\n","import { IsWritableStream, WritableStream } from '../writable-stream';\n\nexport function assertWritableStream(x: unknown, context: string): asserts x is WritableStream {\n  if (!IsWritableStream(x)) {\n    throw new TypeError(`${context} is not a WritableStream.`);\n  }\n}\n","/**\n * A signal object that allows you to communicate with a request and abort it if required\n * via its associated `AbortController` object.\n *\n * @remarks\n *   This interface is compatible with the `AbortSignal` interface defined in TypeScript's DOM types.\n *   It is redefined here, so it can be polyfilled without a DOM, for example with\n *   {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.\n *\n * @public\n */\nexport interface AbortSignal {\n  /**\n   * Whether the request is aborted.\n   */\n  readonly aborted: boolean;\n\n  /**\n   * Add an event listener to be triggered when this signal becomes aborted.\n   */\n  addEventListener(type: 'abort', listener: () => void): void;\n\n  /**\n   * Remove an event listener that was previously added with {@link AbortSignal.addEventListener}.\n   */\n  removeEventListener(type: 'abort', listener: () => void): void;\n}\n\nexport function isAbortSignal(value: unknown): value is AbortSignal {\n  if (typeof value !== 'object' || value === null) {\n    return false;\n  }\n  try {\n    return typeof (value as AbortSignal).aborted === 'boolean';\n  } catch {\n    // AbortSignal.prototype.aborted throws if its brand check fails\n    return false;\n  }\n}\n\n/**\n * A controller object that allows you to abort an `AbortSignal` when desired.\n *\n * @remarks\n *   This interface is compatible with the `AbortController` interface defined in TypeScript's DOM types.\n *   It is redefined here, so it can be polyfilled without a DOM, for example with\n *   {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.\n *\n * @internal\n */\nexport interface AbortController {\n  readonly signal: AbortSignal;\n\n  abort(): void;\n}\n\ninterface AbortControllerConstructor {\n  new(): AbortController;\n}\n\nconst supportsAbortController = typeof (AbortController as any) === 'function';\n\n/**\n * Construct a new AbortController, if supported by the platform.\n *\n * @internal\n */\nexport function createAbortController(): AbortController | undefined {\n  if (supportsAbortController) {\n    return new (AbortController as AbortControllerConstructor)();\n  }\n  return undefined;\n}\n","import assert from '../stub/assert';\nimport {\n  newPromise,\n  promiseRejectedWith,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  uponPromise\n} from './helpers/webidl';\nimport {\n  DequeueValue,\n  EnqueueValueWithSize,\n  PeekQueueValue,\n  QueuePair,\n  ResetQueue\n} from './abstract-ops/queue-with-sizes';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { SimpleQueue } from './simple-queue';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { AbortSteps, ErrorSteps } from './abstract-ops/internal-methods';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport {\n  UnderlyingSink,\n  UnderlyingSinkAbortCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  ValidatedUnderlyingSink\n} from './writable-stream/underlying-sink';\nimport { assertObject, assertRequiredArgument } from './validators/basic';\nimport { convertUnderlyingSink } from './validators/underlying-sink';\nimport { assertWritableStream } from './validators/writable-stream';\nimport { AbortController, AbortSignal, createAbortController } from './abort-signal';\n\ntype WritableStreamState = 'writable' | 'closed' | 'erroring' | 'errored';\n\ninterface WriteOrCloseRequest {\n  _resolve: (value?: undefined) => void;\n  _reject: (reason: any) => void;\n}\n\ntype WriteRequest = WriteOrCloseRequest;\ntype CloseRequest = WriteOrCloseRequest;\n\ninterface PendingAbortRequest {\n  _promise: Promise<undefined>;\n  _resolve: (value?: undefined) => void;\n  _reject: (reason: any) => void;\n  _reason: any;\n  _wasAlreadyErroring: boolean;\n}\n\n/**\n * A writable stream represents a destination for data, into which you can write.\n *\n * @public\n */\nclass WritableStream<W = any> {\n  /** @internal */\n  _state!: WritableStreamState;\n  /** @internal */\n  _storedError: any;\n  /** @internal */\n  _writer: WritableStreamDefaultWriter<W> | undefined;\n  /** @internal */\n  _writableStreamController!: WritableStreamDefaultController<W>;\n  /** @internal */\n  _writeRequests!: SimpleQueue<WriteRequest>;\n  /** @internal */\n  _inFlightWriteRequest: WriteRequest | undefined;\n  /** @internal */\n  _closeRequest: CloseRequest | undefined;\n  /** @internal */\n  _inFlightCloseRequest: CloseRequest | undefined;\n  /** @internal */\n  _pendingAbortRequest: PendingAbortRequest | undefined;\n  /** @internal */\n  _backpressure!: boolean;\n\n  constructor(underlyingSink?: UnderlyingSink<W>, strategy?: QueuingStrategy<W>);\n  constructor(rawUnderlyingSink: UnderlyingSink<W> | null | undefined = {},\n              rawStrategy: QueuingStrategy<W> | null | undefined = {}) {\n    if (rawUnderlyingSink === undefined) {\n      rawUnderlyingSink = null;\n    } else {\n      assertObject(rawUnderlyingSink, 'First parameter');\n    }\n\n    const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');\n    const underlyingSink = convertUnderlyingSink(rawUnderlyingSink, 'First parameter');\n\n    InitializeWritableStream(this);\n\n    const type = underlyingSink.type;\n    if (type !== undefined) {\n      throw new RangeError('Invalid type is specified');\n    }\n\n    const sizeAlgorithm = ExtractSizeAlgorithm(strategy);\n    const highWaterMark = ExtractHighWaterMark(strategy, 1);\n\n    SetUpWritableStreamDefaultControllerFromUnderlyingSink(this, underlyingSink, highWaterMark, sizeAlgorithm);\n  }\n\n  /**\n   * Returns whether or not the writable stream is locked to a writer.\n   */\n  get locked(): boolean {\n    if (!IsWritableStream(this)) {\n      throw streamBrandCheckException('locked');\n    }\n\n    return IsWritableStreamLocked(this);\n  }\n\n  /**\n   * Aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be\n   * immediately moved to an errored state, with any queued-up writes discarded. This will also execute any abort\n   * mechanism of the underlying sink.\n   *\n   * The returned promise will fulfill if the stream shuts down successfully, or reject if the underlying sink signaled\n   * that there was an error doing so. Additionally, it will reject with a `TypeError` (without attempting to cancel\n   * the stream) if the stream is currently locked.\n   */\n  abort(reason: any = undefined): Promise<void> {\n    if (!IsWritableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('abort'));\n    }\n\n    if (IsWritableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot abort a stream that already has a writer'));\n    }\n\n    return WritableStreamAbort(this, reason);\n  }\n\n  /**\n   * Closes the stream. The underlying sink will finish processing any previously-written chunks, before invoking its\n   * close behavior. During this time any further attempts to write will fail (without erroring the stream).\n   *\n   * The method returns a promise that will fulfill if all remaining chunks are successfully written and the stream\n   * successfully closes, or rejects if an error is encountered during this process. Additionally, it will reject with\n   * a `TypeError` (without attempting to cancel the stream) if the stream is currently locked.\n   */\n  close() {\n    if (!IsWritableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('close'));\n    }\n\n    if (IsWritableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot close a stream that already has a writer'));\n    }\n\n    if (WritableStreamCloseQueuedOrInFlight(this)) {\n      return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));\n    }\n\n    return WritableStreamClose(this);\n  }\n\n  /**\n   * Creates a {@link WritableStreamDefaultWriter | writer} and locks the stream to the new writer. While the stream\n   * is locked, no other writer can be acquired until this one is released.\n   *\n   * This functionality is especially useful for creating abstractions that desire the ability to write to a stream\n   * without interruption or interleaving. By getting a writer for the stream, you can ensure nobody else can write at\n   * the same time, which would cause the resulting written data to be unpredictable and probably useless.\n   */\n  getWriter(): WritableStreamDefaultWriter<W> {\n    if (!IsWritableStream(this)) {\n      throw streamBrandCheckException('getWriter');\n    }\n\n    return AcquireWritableStreamDefaultWriter(this);\n  }\n}\n\nObject.defineProperties(WritableStream.prototype, {\n  abort: { enumerable: true },\n  close: { enumerable: true },\n  getWriter: { enumerable: true },\n  locked: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStream.prototype, Symbol.toStringTag, {\n    value: 'WritableStream',\n    configurable: true\n  });\n}\n\nexport {\n  AcquireWritableStreamDefaultWriter,\n  CreateWritableStream,\n  IsWritableStream,\n  IsWritableStreamLocked,\n  WritableStream,\n  WritableStreamAbort,\n  WritableStreamDefaultControllerErrorIfNeeded,\n  WritableStreamDefaultWriterCloseWithErrorPropagation,\n  WritableStreamDefaultWriterRelease,\n  WritableStreamDefaultWriterWrite,\n  WritableStreamCloseQueuedOrInFlight,\n  UnderlyingSink,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkAbortCallback\n};\n\n// Abstract operations for the WritableStream.\n\nfunction AcquireWritableStreamDefaultWriter<W>(stream: WritableStream<W>): WritableStreamDefaultWriter<W> {\n  return new WritableStreamDefaultWriter(stream);\n}\n\n// Throws if and only if startAlgorithm throws.\nfunction CreateWritableStream<W>(startAlgorithm: () => void | PromiseLike<void>,\n                                 writeAlgorithm: (chunk: W) => Promise<void>,\n                                 closeAlgorithm: () => Promise<void>,\n                                 abortAlgorithm: (reason: any) => Promise<void>,\n                                 highWaterMark = 1,\n                                 sizeAlgorithm: QueuingStrategySizeCallback<W> = () => 1) {\n  assert(IsNonNegativeNumber(highWaterMark));\n\n  const stream: WritableStream<W> = Object.create(WritableStream.prototype);\n  InitializeWritableStream(stream);\n\n  const controller: WritableStreamDefaultController<W> = Object.create(WritableStreamDefaultController.prototype);\n\n  SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm,\n                                       abortAlgorithm, highWaterMark, sizeAlgorithm);\n  return stream;\n}\n\nfunction InitializeWritableStream<W>(stream: WritableStream<W>) {\n  stream._state = 'writable';\n\n  // The error that will be reported by new method calls once the state becomes errored. Only set when [[state]] is\n  // 'erroring' or 'errored'. May be set to an undefined value.\n  stream._storedError = undefined;\n\n  stream._writer = undefined;\n\n  // Initialize to undefined first because the constructor of the controller checks this\n  // variable to validate the caller.\n  stream._writableStreamController = undefined!;\n\n  // This queue is placed here instead of the writer class in order to allow for passing a writer to the next data\n  // producer without waiting for the queued writes to finish.\n  stream._writeRequests = new SimpleQueue();\n\n  // Write requests are removed from _writeRequests when write() is called on the underlying sink. This prevents\n  // them from being erroneously rejected on error. If a write() call is in-flight, the request is stored here.\n  stream._inFlightWriteRequest = undefined;\n\n  // The promise that was returned from writer.close(). Stored here because it may be fulfilled after the writer\n  // has been detached.\n  stream._closeRequest = undefined;\n\n  // Close request is removed from _closeRequest when close() is called on the underlying sink. This prevents it\n  // from being erroneously rejected on error. If a close() call is in-flight, the request is stored here.\n  stream._inFlightCloseRequest = undefined;\n\n  // The promise that was returned from writer.abort(). This may also be fulfilled after the writer has detached.\n  stream._pendingAbortRequest = undefined;\n\n  // The backpressure signal set by the controller.\n  stream._backpressure = false;\n}\n\nfunction IsWritableStream(x: unknown): x is WritableStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_writableStreamController')) {\n    return false;\n  }\n\n  return x instanceof WritableStream;\n}\n\nfunction IsWritableStreamLocked(stream: WritableStream): boolean {\n  assert(IsWritableStream(stream));\n\n  if (stream._writer === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamAbort(stream: WritableStream, reason: any): Promise<undefined> {\n  if (stream._state === 'closed' || stream._state === 'errored') {\n    return promiseResolvedWith(undefined);\n  }\n  stream._writableStreamController._abortReason = reason;\n  stream._writableStreamController._abortController?.abort();\n\n  // TypeScript narrows the type of `stream._state` down to 'writable' | 'erroring',\n  // but it doesn't know that signaling abort runs author code that might have changed the state.\n  // Widen the type again by casting to WritableStreamState.\n  const state = stream._state as WritableStreamState;\n\n  if (state === 'closed' || state === 'errored') {\n    return promiseResolvedWith(undefined);\n  }\n  if (stream._pendingAbortRequest !== undefined) {\n    return stream._pendingAbortRequest._promise;\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n\n  let wasAlreadyErroring = false;\n  if (state === 'erroring') {\n    wasAlreadyErroring = true;\n    // reason will not be used, so don't keep a reference to it.\n    reason = undefined;\n  }\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    stream._pendingAbortRequest = {\n      _promise: undefined!,\n      _resolve: resolve,\n      _reject: reject,\n      _reason: reason,\n      _wasAlreadyErroring: wasAlreadyErroring\n    };\n  });\n  stream._pendingAbortRequest!._promise = promise;\n\n  if (!wasAlreadyErroring) {\n    WritableStreamStartErroring(stream, reason);\n  }\n\n  return promise;\n}\n\nfunction WritableStreamClose(stream: WritableStream<any>): Promise<undefined> {\n  const state = stream._state;\n  if (state === 'closed' || state === 'errored') {\n    return promiseRejectedWith(new TypeError(\n      `The stream (in ${state} state) is not in the writable state and cannot be closed`));\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n  assert(!WritableStreamCloseQueuedOrInFlight(stream));\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    const closeRequest: CloseRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._closeRequest = closeRequest;\n  });\n\n  const writer = stream._writer;\n  if (writer !== undefined && stream._backpressure && state === 'writable') {\n    defaultWriterReadyPromiseResolve(writer);\n  }\n\n  WritableStreamDefaultControllerClose(stream._writableStreamController);\n\n  return promise;\n}\n\n// WritableStream API exposed for controllers.\n\nfunction WritableStreamAddWriteRequest(stream: WritableStream): Promise<undefined> {\n  assert(IsWritableStreamLocked(stream));\n  assert(stream._state === 'writable');\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    const writeRequest: WriteRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._writeRequests.push(writeRequest);\n  });\n\n  return promise;\n}\n\nfunction WritableStreamDealWithRejection(stream: WritableStream, error: any) {\n  const state = stream._state;\n\n  if (state === 'writable') {\n    WritableStreamStartErroring(stream, error);\n    return;\n  }\n\n  assert(state === 'erroring');\n  WritableStreamFinishErroring(stream);\n}\n\nfunction WritableStreamStartErroring(stream: WritableStream, reason: any) {\n  assert(stream._storedError === undefined);\n  assert(stream._state === 'writable');\n\n  const controller = stream._writableStreamController;\n  assert(controller !== undefined);\n\n  stream._state = 'erroring';\n  stream._storedError = reason;\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);\n  }\n\n  if (!WritableStreamHasOperationMarkedInFlight(stream) && controller._started) {\n    WritableStreamFinishErroring(stream);\n  }\n}\n\nfunction WritableStreamFinishErroring(stream: WritableStream) {\n  assert(stream._state === 'erroring');\n  assert(!WritableStreamHasOperationMarkedInFlight(stream));\n  stream._state = 'errored';\n  stream._writableStreamController[ErrorSteps]();\n\n  const storedError = stream._storedError;\n  stream._writeRequests.forEach(writeRequest => {\n    writeRequest._reject(storedError);\n  });\n  stream._writeRequests = new SimpleQueue();\n\n  if (stream._pendingAbortRequest === undefined) {\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    return;\n  }\n\n  const abortRequest = stream._pendingAbortRequest;\n  stream._pendingAbortRequest = undefined;\n\n  if (abortRequest._wasAlreadyErroring) {\n    abortRequest._reject(storedError);\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    return;\n  }\n\n  const promise = stream._writableStreamController[AbortSteps](abortRequest._reason);\n  uponPromise(\n    promise,\n    () => {\n      abortRequest._resolve();\n      WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    },\n    (reason: any) => {\n      abortRequest._reject(reason);\n      WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    });\n}\n\nfunction WritableStreamFinishInFlightWrite(stream: WritableStream) {\n  assert(stream._inFlightWriteRequest !== undefined);\n  stream._inFlightWriteRequest!._resolve(undefined);\n  stream._inFlightWriteRequest = undefined;\n}\n\nfunction WritableStreamFinishInFlightWriteWithError(stream: WritableStream, error: any) {\n  assert(stream._inFlightWriteRequest !== undefined);\n  stream._inFlightWriteRequest!._reject(error);\n  stream._inFlightWriteRequest = undefined;\n\n  assert(stream._state === 'writable' || stream._state === 'erroring');\n\n  WritableStreamDealWithRejection(stream, error);\n}\n\nfunction WritableStreamFinishInFlightClose(stream: WritableStream) {\n  assert(stream._inFlightCloseRequest !== undefined);\n  stream._inFlightCloseRequest!._resolve(undefined);\n  stream._inFlightCloseRequest = undefined;\n\n  const state = stream._state;\n\n  assert(state === 'writable' || state === 'erroring');\n\n  if (state === 'erroring') {\n    // The error was too late to do anything, so it is ignored.\n    stream._storedError = undefined;\n    if (stream._pendingAbortRequest !== undefined) {\n      stream._pendingAbortRequest._resolve();\n      stream._pendingAbortRequest = undefined;\n    }\n  }\n\n  stream._state = 'closed';\n\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    defaultWriterClosedPromiseResolve(writer);\n  }\n\n  assert(stream._pendingAbortRequest === undefined);\n  assert(stream._storedError === undefined);\n}\n\nfunction WritableStreamFinishInFlightCloseWithError(stream: WritableStream, error: any) {\n  assert(stream._inFlightCloseRequest !== undefined);\n  stream._inFlightCloseRequest!._reject(error);\n  stream._inFlightCloseRequest = undefined;\n\n  assert(stream._state === 'writable' || stream._state === 'erroring');\n\n  // Never execute sink abort() after sink close().\n  if (stream._pendingAbortRequest !== undefined) {\n    stream._pendingAbortRequest._reject(error);\n    stream._pendingAbortRequest = undefined;\n  }\n  WritableStreamDealWithRejection(stream, error);\n}\n\n// TODO(ricea): Fix alphabetical order.\nfunction WritableStreamCloseQueuedOrInFlight(stream: WritableStream): boolean {\n  if (stream._closeRequest === undefined && stream._inFlightCloseRequest === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamHasOperationMarkedInFlight(stream: WritableStream): boolean {\n  if (stream._inFlightWriteRequest === undefined && stream._inFlightCloseRequest === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamMarkCloseRequestInFlight(stream: WritableStream) {\n  assert(stream._inFlightCloseRequest === undefined);\n  assert(stream._closeRequest !== undefined);\n  stream._inFlightCloseRequest = stream._closeRequest;\n  stream._closeRequest = undefined;\n}\n\nfunction WritableStreamMarkFirstWriteRequestInFlight(stream: WritableStream) {\n  assert(stream._inFlightWriteRequest === undefined);\n  assert(stream._writeRequests.length !== 0);\n  stream._inFlightWriteRequest = stream._writeRequests.shift();\n}\n\nfunction WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream: WritableStream) {\n  assert(stream._state === 'errored');\n  if (stream._closeRequest !== undefined) {\n    assert(stream._inFlightCloseRequest === undefined);\n\n    stream._closeRequest._reject(stream._storedError);\n    stream._closeRequest = undefined;\n  }\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    defaultWriterClosedPromiseReject(writer, stream._storedError);\n  }\n}\n\nfunction WritableStreamUpdateBackpressure(stream: WritableStream, backpressure: boolean) {\n  assert(stream._state === 'writable');\n  assert(!WritableStreamCloseQueuedOrInFlight(stream));\n\n  const writer = stream._writer;\n  if (writer !== undefined && backpressure !== stream._backpressure) {\n    if (backpressure) {\n      defaultWriterReadyPromiseReset(writer);\n    } else {\n      assert(!backpressure);\n\n      defaultWriterReadyPromiseResolve(writer);\n    }\n  }\n\n  stream._backpressure = backpressure;\n}\n\n/**\n * A default writer vended by a {@link WritableStream}.\n *\n * @public\n */\nexport class WritableStreamDefaultWriter<W = any> {\n  /** @internal */\n  _ownerWritableStream: WritableStream<W>;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _closedPromiseState!: 'pending' | 'resolved' | 'rejected';\n  /** @internal */\n  _readyPromise!: Promise<undefined>;\n  /** @internal */\n  _readyPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _readyPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readyPromiseState!: 'pending' | 'fulfilled' | 'rejected';\n\n  constructor(stream: WritableStream<W>) {\n    assertRequiredArgument(stream, 1, 'WritableStreamDefaultWriter');\n    assertWritableStream(stream, 'First parameter');\n\n    if (IsWritableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive writing by another writer');\n    }\n\n    this._ownerWritableStream = stream;\n    stream._writer = this;\n\n    const state = stream._state;\n\n    if (state === 'writable') {\n      if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._backpressure) {\n        defaultWriterReadyPromiseInitialize(this);\n      } else {\n        defaultWriterReadyPromiseInitializeAsResolved(this);\n      }\n\n      defaultWriterClosedPromiseInitialize(this);\n    } else if (state === 'erroring') {\n      defaultWriterReadyPromiseInitializeAsRejected(this, stream._storedError);\n      defaultWriterClosedPromiseInitialize(this);\n    } else if (state === 'closed') {\n      defaultWriterReadyPromiseInitializeAsResolved(this);\n      defaultWriterClosedPromiseInitializeAsResolved(this);\n    } else {\n      assert(state === 'errored');\n\n      const storedError = stream._storedError;\n      defaultWriterReadyPromiseInitializeAsRejected(this, storedError);\n      defaultWriterClosedPromiseInitializeAsRejected(this, storedError);\n    }\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or\n   * the writer’s lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * Returns the desired size to fill the stream’s internal queue. It can be negative, if the queue is over-full.\n   * A producer can use this information to determine the right amount of data to write.\n   *\n   * It will be `null` if the stream cannot be successfully written to (due to either being errored, or having an abort\n   * queued up). It will return zero if the stream is closed. And the getter will throw an exception if invoked when\n   * the writer’s lock is released.\n   */\n  get desiredSize(): number | null {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      throw defaultWriterBrandCheckException('desiredSize');\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      throw defaultWriterLockException('desiredSize');\n    }\n\n    return WritableStreamDefaultWriterGetDesiredSize(this);\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the desired size to fill the stream’s internal queue transitions\n   * from non-positive to positive, signaling that it is no longer applying backpressure. Once the desired size dips\n   * back to zero or below, the getter will return a new promise that stays pending until the next transition.\n   *\n   * If the stream becomes errored or aborted, or the writer’s lock is released, the returned promise will become\n   * rejected.\n   */\n  get ready(): Promise<undefined> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('ready'));\n    }\n\n    return this._readyPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link WritableStream.abort | stream.abort(reason)}.\n   */\n  abort(reason: any = undefined): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('abort'));\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('abort'));\n    }\n\n    return WritableStreamDefaultWriterAbort(this, reason);\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link WritableStream.close | stream.close()}.\n   */\n  close(): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('close'));\n    }\n\n    const stream = this._ownerWritableStream;\n\n    if (stream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('close'));\n    }\n\n    if (WritableStreamCloseQueuedOrInFlight(stream)) {\n      return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));\n    }\n\n    return WritableStreamDefaultWriterClose(this);\n  }\n\n  /**\n   * Releases the writer’s lock on the corresponding stream. After the lock is released, the writer is no longer active.\n   * If the associated stream is errored when the lock is released, the writer will appear errored in the same way from\n   * now on; otherwise, the writer will appear closed.\n   *\n   * Note that the lock can still be released even if some ongoing writes have not yet finished (i.e. even if the\n   * promises returned from previous calls to {@link WritableStreamDefaultWriter.write | write()} have not yet settled).\n   * It’s not necessary to hold the lock on the writer for the duration of the write; the lock instead simply prevents\n   * other producers from writing in an interleaved manner.\n   */\n  releaseLock(): void {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      throw defaultWriterBrandCheckException('releaseLock');\n    }\n\n    const stream = this._ownerWritableStream;\n\n    if (stream === undefined) {\n      return;\n    }\n\n    assert(stream._writer !== undefined);\n\n    WritableStreamDefaultWriterRelease(this);\n  }\n\n  /**\n   * Writes the given chunk to the writable stream, by waiting until any previous writes have finished successfully,\n   * and then sending the chunk to the underlying sink's {@link UnderlyingSink.write | write()} method. It will return\n   * a promise that fulfills with undefined upon a successful write, or rejects if the write fails or stream becomes\n   * errored before the writing process is initiated.\n   *\n   * Note that what \"success\" means is up to the underlying sink; it might indicate simply that the chunk has been\n   * accepted, and not necessarily that it is safely saved to its ultimate destination.\n   */\n  write(chunk: W): Promise<void>;\n  write(chunk: W = undefined!): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('write'));\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('write to'));\n    }\n\n    return WritableStreamDefaultWriterWrite(this, chunk);\n  }\n}\n\nObject.defineProperties(WritableStreamDefaultWriter.prototype, {\n  abort: { enumerable: true },\n  close: { enumerable: true },\n  releaseLock: { enumerable: true },\n  write: { enumerable: true },\n  closed: { enumerable: true },\n  desiredSize: { enumerable: true },\n  ready: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStreamDefaultWriter.prototype, Symbol.toStringTag, {\n    value: 'WritableStreamDefaultWriter',\n    configurable: true\n  });\n}\n\n// Abstract operations for the WritableStreamDefaultWriter.\n\nfunction IsWritableStreamDefaultWriter<W = any>(x: any): x is WritableStreamDefaultWriter<W> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) {\n    return false;\n  }\n\n  return x instanceof WritableStreamDefaultWriter;\n}\n\n// A client of WritableStreamDefaultWriter may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultWriterAbort(writer: WritableStreamDefaultWriter, reason: any) {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  return WritableStreamAbort(stream, reason);\n}\n\nfunction WritableStreamDefaultWriterClose(writer: WritableStreamDefaultWriter): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  return WritableStreamClose(stream);\n}\n\nfunction WritableStreamDefaultWriterCloseWithErrorPropagation(writer: WritableStreamDefaultWriter): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  const state = stream._state;\n  if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {\n    return promiseResolvedWith(undefined);\n  }\n\n  if (state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n\n  return WritableStreamDefaultWriterClose(writer);\n}\n\nfunction WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer: WritableStreamDefaultWriter, error: any) {\n  if (writer._closedPromiseState === 'pending') {\n    defaultWriterClosedPromiseReject(writer, error);\n  } else {\n    defaultWriterClosedPromiseResetToRejected(writer, error);\n  }\n}\n\nfunction WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer: WritableStreamDefaultWriter, error: any) {\n  if (writer._readyPromiseState === 'pending') {\n    defaultWriterReadyPromiseReject(writer, error);\n  } else {\n    defaultWriterReadyPromiseResetToRejected(writer, error);\n  }\n}\n\nfunction WritableStreamDefaultWriterGetDesiredSize(writer: WritableStreamDefaultWriter): number | null {\n  const stream = writer._ownerWritableStream;\n  const state = stream._state;\n\n  if (state === 'errored' || state === 'erroring') {\n    return null;\n  }\n\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return WritableStreamDefaultControllerGetDesiredSize(stream._writableStreamController);\n}\n\nfunction WritableStreamDefaultWriterRelease(writer: WritableStreamDefaultWriter) {\n  const stream = writer._ownerWritableStream;\n  assert(stream !== undefined);\n  assert(stream._writer === writer);\n\n  const releasedError = new TypeError(\n    `Writer was released and can no longer be used to monitor the stream's closedness`);\n\n  WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, releasedError);\n\n  // The state transitions to \"errored\" before the sink abort() method runs, but the writer.closed promise is not\n  // rejected until afterwards. This means that simply testing state will not work.\n  WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, releasedError);\n\n  stream._writer = undefined;\n  writer._ownerWritableStream = undefined!;\n}\n\nfunction WritableStreamDefaultWriterWrite<W>(writer: WritableStreamDefaultWriter<W>, chunk: W): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  const controller = stream._writableStreamController;\n\n  const chunkSize = WritableStreamDefaultControllerGetChunkSize(controller, chunk);\n\n  if (stream !== writer._ownerWritableStream) {\n    return promiseRejectedWith(defaultWriterLockException('write to'));\n  }\n\n  const state = stream._state;\n  if (state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n  if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {\n    return promiseRejectedWith(new TypeError('The stream is closing or closed and cannot be written to'));\n  }\n  if (state === 'erroring') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  assert(state === 'writable');\n\n  const promise = WritableStreamAddWriteRequest(stream);\n\n  WritableStreamDefaultControllerWrite(controller, chunk, chunkSize);\n\n  return promise;\n}\n\nconst closeSentinel: unique symbol = {} as any;\n\ntype QueueRecord<W> = W | typeof closeSentinel;\n\n/**\n * Allows control of a {@link WritableStream | writable stream}'s state and internal queue.\n *\n * @public\n */\nexport class WritableStreamDefaultController<W = any> {\n  /** @internal */\n  _controlledWritableStream!: WritableStream<W>;\n  /** @internal */\n  _queue!: SimpleQueue<QueuePair<QueueRecord<W>>>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _abortReason: any;\n  /** @internal */\n  _abortController: AbortController | undefined;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _strategySizeAlgorithm!: QueuingStrategySizeCallback<W>;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _writeAlgorithm!: (chunk: W) => Promise<void>;\n  /** @internal */\n  _closeAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _abortAlgorithm!: (reason: any) => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * The reason which was passed to `WritableStream.abort(reason)` when the stream was aborted.\n   *\n   * @deprecated\n   *  This property has been removed from the specification, see https://github.com/whatwg/streams/pull/1177.\n   *  Use {@link WritableStreamDefaultController.signal}'s `reason` instead.\n   */\n  get abortReason(): any {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('abortReason');\n    }\n    return this._abortReason;\n  }\n\n  /**\n   * An `AbortSignal` that can be used to abort the pending write or close operation when the stream is aborted.\n   */\n  get signal(): AbortSignal {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('signal');\n    }\n    if (this._abortController === undefined) {\n      // Older browsers or older Node versions may not support `AbortController` or `AbortSignal`.\n      // We don't want to bundle and ship an `AbortController` polyfill together with our polyfill,\n      // so instead we only implement support for `signal` if we find a global `AbortController` constructor.\n      throw new TypeError('WritableStreamDefaultController.prototype.signal is not supported');\n    }\n    return this._abortController.signal;\n  }\n\n  /**\n   * Closes the controlled writable stream, making all future interactions with it fail with the given error `e`.\n   *\n   * This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying\n   * sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the\n   * normal lifecycle of interactions with the underlying sink.\n   */\n  error(e: any = undefined): void {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n    const state = this._controlledWritableStream._state;\n    if (state !== 'writable') {\n      // The stream is closed, errored or will be soon. The sink can't do anything useful if it gets an error here, so\n      // just treat it as a no-op.\n      return;\n    }\n\n    WritableStreamDefaultControllerError(this, e);\n  }\n\n  /** @internal */\n  [AbortSteps](reason: any): Promise<void> {\n    const result = this._abortAlgorithm(reason);\n    WritableStreamDefaultControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [ErrorSteps]() {\n    ResetQueue(this);\n  }\n}\n\nObject.defineProperties(WritableStreamDefaultController.prototype, {\n  abortReason: { enumerable: true },\n  signal: { enumerable: true },\n  error: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'WritableStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Abstract operations implementing interface required by the WritableStream.\n\nfunction IsWritableStreamDefaultController(x: any): x is WritableStreamDefaultController<any> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledWritableStream')) {\n    return false;\n  }\n\n  return x instanceof WritableStreamDefaultController;\n}\n\nfunction SetUpWritableStreamDefaultController<W>(stream: WritableStream<W>,\n                                                 controller: WritableStreamDefaultController<W>,\n                                                 startAlgorithm: () => void | PromiseLike<void>,\n                                                 writeAlgorithm: (chunk: W) => Promise<void>,\n                                                 closeAlgorithm: () => Promise<void>,\n                                                 abortAlgorithm: (reason: any) => Promise<void>,\n                                                 highWaterMark: number,\n                                                 sizeAlgorithm: QueuingStrategySizeCallback<W>) {\n  assert(IsWritableStream(stream));\n  assert(stream._writableStreamController === undefined);\n\n  controller._controlledWritableStream = stream;\n  stream._writableStreamController = controller;\n\n  // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n  controller._queue = undefined!;\n  controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._abortReason = undefined;\n  controller._abortController = createAbortController();\n  controller._started = false;\n\n  controller._strategySizeAlgorithm = sizeAlgorithm;\n  controller._strategyHWM = highWaterMark;\n\n  controller._writeAlgorithm = writeAlgorithm;\n  controller._closeAlgorithm = closeAlgorithm;\n  controller._abortAlgorithm = abortAlgorithm;\n\n  const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n  WritableStreamUpdateBackpressure(stream, backpressure);\n\n  const startResult = startAlgorithm();\n  const startPromise = promiseResolvedWith(startResult);\n  uponPromise(\n    startPromise,\n    () => {\n      assert(stream._state === 'writable' || stream._state === 'erroring');\n      controller._started = true;\n      WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n    },\n    r => {\n      assert(stream._state === 'writable' || stream._state === 'erroring');\n      controller._started = true;\n      WritableStreamDealWithRejection(stream, r);\n    }\n  );\n}\n\nfunction SetUpWritableStreamDefaultControllerFromUnderlyingSink<W>(stream: WritableStream<W>,\n                                                                   underlyingSink: ValidatedUnderlyingSink<W>,\n                                                                   highWaterMark: number,\n                                                                   sizeAlgorithm: QueuingStrategySizeCallback<W>) {\n  const controller = Object.create(WritableStreamDefaultController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let writeAlgorithm: (chunk: W) => Promise<void> = () => promiseResolvedWith(undefined);\n  let closeAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let abortAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingSink.start !== undefined) {\n    startAlgorithm = () => underlyingSink.start!(controller);\n  }\n  if (underlyingSink.write !== undefined) {\n    writeAlgorithm = chunk => underlyingSink.write!(chunk, controller);\n  }\n  if (underlyingSink.close !== undefined) {\n    closeAlgorithm = () => underlyingSink.close!();\n  }\n  if (underlyingSink.abort !== undefined) {\n    abortAlgorithm = reason => underlyingSink.abort!(reason);\n  }\n\n  SetUpWritableStreamDefaultController(\n    stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm\n  );\n}\n\n// ClearAlgorithms may be called twice. Erroring the same stream in multiple ways will often result in redundant calls.\nfunction WritableStreamDefaultControllerClearAlgorithms(controller: WritableStreamDefaultController<any>) {\n  controller._writeAlgorithm = undefined!;\n  controller._closeAlgorithm = undefined!;\n  controller._abortAlgorithm = undefined!;\n  controller._strategySizeAlgorithm = undefined!;\n}\n\nfunction WritableStreamDefaultControllerClose<W>(controller: WritableStreamDefaultController<W>) {\n  EnqueueValueWithSize(controller, closeSentinel, 0);\n  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\nfunction WritableStreamDefaultControllerGetChunkSize<W>(controller: WritableStreamDefaultController<W>,\n                                                        chunk: W): number {\n  try {\n    return controller._strategySizeAlgorithm(chunk);\n  } catch (chunkSizeE) {\n    WritableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE);\n    return 1;\n  }\n}\n\nfunction WritableStreamDefaultControllerGetDesiredSize(controller: WritableStreamDefaultController<any>): number {\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\nfunction WritableStreamDefaultControllerWrite<W>(controller: WritableStreamDefaultController<W>,\n                                                 chunk: W,\n                                                 chunkSize: number) {\n  try {\n    EnqueueValueWithSize(controller, chunk, chunkSize);\n  } catch (enqueueE) {\n    WritableStreamDefaultControllerErrorIfNeeded(controller, enqueueE);\n    return;\n  }\n\n  const stream = controller._controlledWritableStream;\n  if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._state === 'writable') {\n    const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n    WritableStreamUpdateBackpressure(stream, backpressure);\n  }\n\n  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\n// Abstract operations for the WritableStreamDefaultController.\n\nfunction WritableStreamDefaultControllerAdvanceQueueIfNeeded<W>(controller: WritableStreamDefaultController<W>) {\n  const stream = controller._controlledWritableStream;\n\n  if (!controller._started) {\n    return;\n  }\n\n  if (stream._inFlightWriteRequest !== undefined) {\n    return;\n  }\n\n  const state = stream._state;\n  assert(state !== 'closed' && state !== 'errored');\n  if (state === 'erroring') {\n    WritableStreamFinishErroring(stream);\n    return;\n  }\n\n  if (controller._queue.length === 0) {\n    return;\n  }\n\n  const value = PeekQueueValue(controller);\n  if (value === closeSentinel) {\n    WritableStreamDefaultControllerProcessClose(controller);\n  } else {\n    WritableStreamDefaultControllerProcessWrite(controller, value);\n  }\n}\n\nfunction WritableStreamDefaultControllerErrorIfNeeded(controller: WritableStreamDefaultController<any>, error: any) {\n  if (controller._controlledWritableStream._state === 'writable') {\n    WritableStreamDefaultControllerError(controller, error);\n  }\n}\n\nfunction WritableStreamDefaultControllerProcessClose(controller: WritableStreamDefaultController<any>) {\n  const stream = controller._controlledWritableStream;\n\n  WritableStreamMarkCloseRequestInFlight(stream);\n\n  DequeueValue(controller);\n  assert(controller._queue.length === 0);\n\n  const sinkClosePromise = controller._closeAlgorithm();\n  WritableStreamDefaultControllerClearAlgorithms(controller);\n  uponPromise(\n    sinkClosePromise,\n    () => {\n      WritableStreamFinishInFlightClose(stream);\n    },\n    reason => {\n      WritableStreamFinishInFlightCloseWithError(stream, reason);\n    }\n  );\n}\n\nfunction WritableStreamDefaultControllerProcessWrite<W>(controller: WritableStreamDefaultController<W>, chunk: W) {\n  const stream = controller._controlledWritableStream;\n\n  WritableStreamMarkFirstWriteRequestInFlight(stream);\n\n  const sinkWritePromise = controller._writeAlgorithm(chunk);\n  uponPromise(\n    sinkWritePromise,\n    () => {\n      WritableStreamFinishInFlightWrite(stream);\n\n      const state = stream._state;\n      assert(state === 'writable' || state === 'erroring');\n\n      DequeueValue(controller);\n\n      if (!WritableStreamCloseQueuedOrInFlight(stream) && state === 'writable') {\n        const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n        WritableStreamUpdateBackpressure(stream, backpressure);\n      }\n\n      WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n    },\n    reason => {\n      if (stream._state === 'writable') {\n        WritableStreamDefaultControllerClearAlgorithms(controller);\n      }\n      WritableStreamFinishInFlightWriteWithError(stream, reason);\n    }\n  );\n}\n\nfunction WritableStreamDefaultControllerGetBackpressure(controller: WritableStreamDefaultController<any>): boolean {\n  const desiredSize = WritableStreamDefaultControllerGetDesiredSize(controller);\n  return desiredSize <= 0;\n}\n\n// A client of WritableStreamDefaultController may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultControllerError(controller: WritableStreamDefaultController<any>, error: any) {\n  const stream = controller._controlledWritableStream;\n\n  assert(stream._state === 'writable');\n\n  WritableStreamDefaultControllerClearAlgorithms(controller);\n  WritableStreamStartErroring(stream, error);\n}\n\n// Helper functions for the WritableStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(`WritableStream.prototype.${name} can only be used on a WritableStream`);\n}\n\n// Helper functions for the WritableStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `WritableStreamDefaultController.prototype.${name} can only be used on a WritableStreamDefaultController`);\n}\n\n\n// Helper functions for the WritableStreamDefaultWriter.\n\nfunction defaultWriterBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `WritableStreamDefaultWriter.prototype.${name} can only be used on a WritableStreamDefaultWriter`);\n}\n\nfunction defaultWriterLockException(name: string): TypeError {\n  return new TypeError('Cannot ' + name + ' a stream using a released writer');\n}\n\nfunction defaultWriterClosedPromiseInitialize(writer: WritableStreamDefaultWriter) {\n  writer._closedPromise = newPromise((resolve, reject) => {\n    writer._closedPromise_resolve = resolve;\n    writer._closedPromise_reject = reject;\n    writer._closedPromiseState = 'pending';\n  });\n}\n\nfunction defaultWriterClosedPromiseInitializeAsRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  defaultWriterClosedPromiseInitialize(writer);\n  defaultWriterClosedPromiseReject(writer, reason);\n}\n\nfunction defaultWriterClosedPromiseInitializeAsResolved(writer: WritableStreamDefaultWriter) {\n  defaultWriterClosedPromiseInitialize(writer);\n  defaultWriterClosedPromiseResolve(writer);\n}\n\nfunction defaultWriterClosedPromiseReject(writer: WritableStreamDefaultWriter, reason: any) {\n  if (writer._closedPromise_reject === undefined) {\n    return;\n  }\n  assert(writer._closedPromiseState === 'pending');\n\n  setPromiseIsHandledToTrue(writer._closedPromise);\n  writer._closedPromise_reject(reason);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'rejected';\n}\n\nfunction defaultWriterClosedPromiseResetToRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  assert(writer._closedPromise_resolve === undefined);\n  assert(writer._closedPromise_reject === undefined);\n  assert(writer._closedPromiseState !== 'pending');\n\n  defaultWriterClosedPromiseInitializeAsRejected(writer, reason);\n}\n\nfunction defaultWriterClosedPromiseResolve(writer: WritableStreamDefaultWriter) {\n  if (writer._closedPromise_resolve === undefined) {\n    return;\n  }\n  assert(writer._closedPromiseState === 'pending');\n\n  writer._closedPromise_resolve(undefined);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'resolved';\n}\n\nfunction defaultWriterReadyPromiseInitialize(writer: WritableStreamDefaultWriter) {\n  writer._readyPromise = newPromise((resolve, reject) => {\n    writer._readyPromise_resolve = resolve;\n    writer._readyPromise_reject = reject;\n  });\n  writer._readyPromiseState = 'pending';\n}\n\nfunction defaultWriterReadyPromiseInitializeAsRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  defaultWriterReadyPromiseInitialize(writer);\n  defaultWriterReadyPromiseReject(writer, reason);\n}\n\nfunction defaultWriterReadyPromiseInitializeAsResolved(writer: WritableStreamDefaultWriter) {\n  defaultWriterReadyPromiseInitialize(writer);\n  defaultWriterReadyPromiseResolve(writer);\n}\n\nfunction defaultWriterReadyPromiseReject(writer: WritableStreamDefaultWriter, reason: any) {\n  if (writer._readyPromise_reject === undefined) {\n    return;\n  }\n\n  setPromiseIsHandledToTrue(writer._readyPromise);\n  writer._readyPromise_reject(reason);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'rejected';\n}\n\nfunction defaultWriterReadyPromiseReset(writer: WritableStreamDefaultWriter) {\n  assert(writer._readyPromise_resolve === undefined);\n  assert(writer._readyPromise_reject === undefined);\n\n  defaultWriterReadyPromiseInitialize(writer);\n}\n\nfunction defaultWriterReadyPromiseResetToRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  assert(writer._readyPromise_resolve === undefined);\n  assert(writer._readyPromise_reject === undefined);\n\n  defaultWriterReadyPromiseInitializeAsRejected(writer, reason);\n}\n\nfunction defaultWriterReadyPromiseResolve(writer: WritableStreamDefaultWriter) {\n  if (writer._readyPromise_resolve === undefined) {\n    return;\n  }\n\n  writer._readyPromise_resolve(undefined);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'fulfilled';\n}\n","/// <reference lib=\"dom\" />\nexport const NativeDOMException: typeof DOMException | undefined =\n  typeof DOMException !== 'undefined' ? DOMException : undefined;\n","/// <reference types=\"node\" />\nimport { NativeDOMException } from './native';\n\ndeclare class DOMExceptionClass extends Error {\n  constructor(message?: string, name?: string);\n\n  name: string;\n  message: string;\n}\n\ntype DOMException = DOMExceptionClass;\ntype DOMExceptionConstructor = typeof DOMExceptionClass;\n\nfunction isDOMExceptionConstructor(ctor: unknown): ctor is DOMExceptionConstructor {\n  if (!(typeof ctor === 'function' || typeof ctor === 'object')) {\n    return false;\n  }\n  try {\n    new (ctor as DOMExceptionConstructor)();\n    return true;\n  } catch {\n    return false;\n  }\n}\n\nfunction createDOMExceptionPolyfill(): DOMExceptionConstructor {\n  // eslint-disable-next-line no-shadow\n  const ctor = function DOMException(this: DOMException, message?: string, name?: string) {\n    this.message = message || '';\n    this.name = name || 'Error';\n    if (Error.captureStackTrace) {\n      Error.captureStackTrace(this, this.constructor);\n    }\n  } as any;\n  ctor.prototype = Object.create(Error.prototype);\n  Object.defineProperty(ctor.prototype, 'constructor', { value: ctor, writable: true, configurable: true });\n  return ctor;\n}\n\n// eslint-disable-next-line no-redeclare\nconst DOMException: DOMExceptionConstructor =\n  isDOMExceptionConstructor(NativeDOMException) ? NativeDOMException : createDOMExceptionPolyfill();\n\nexport { DOMException };\n","import { IsReadableStream, IsReadableStreamLocked, ReadableStream, ReadableStreamCancel } from '../readable-stream';\nimport { AcquireReadableStreamDefaultReader, ReadableStreamDefaultReaderRead } from './default-reader';\nimport { ReadableStreamReaderGenericRelease } from './generic-reader';\nimport {\n  AcquireWritableStreamDefaultWriter,\n  IsWritableStream,\n  IsWritableStreamLocked,\n  WritableStream,\n  WritableStreamAbort,\n  WritableStreamCloseQueuedOrInFlight,\n  WritableStreamDefaultWriterCloseWithErrorPropagation,\n  WritableStreamDefaultWriterRelease,\n  WritableStreamDefaultWriterWrite\n} from '../writable-stream';\nimport assert from '../../stub/assert';\nimport {\n  newPromise,\n  PerformPromiseThen,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  uponFulfillment,\n  uponPromise,\n  uponRejection\n} from '../helpers/webidl';\nimport { noop } from '../../utils';\nimport { AbortSignal, isAbortSignal } from '../abort-signal';\nimport { DOMException } from '../../stub/dom-exception';\n\nexport function ReadableStreamPipeTo<T>(source: ReadableStream<T>,\n                                        dest: WritableStream<T>,\n                                        preventClose: boolean,\n                                        preventAbort: boolean,\n                                        preventCancel: boolean,\n                                        signal: AbortSignal | undefined): Promise<undefined> {\n  assert(IsReadableStream(source));\n  assert(IsWritableStream(dest));\n  assert(typeof preventClose === 'boolean');\n  assert(typeof preventAbort === 'boolean');\n  assert(typeof preventCancel === 'boolean');\n  assert(signal === undefined || isAbortSignal(signal));\n  assert(!IsReadableStreamLocked(source));\n  assert(!IsWritableStreamLocked(dest));\n\n  const reader = AcquireReadableStreamDefaultReader<T>(source);\n  const writer = AcquireWritableStreamDefaultWriter<T>(dest);\n\n  source._disturbed = true;\n\n  let shuttingDown = false;\n\n  // This is used to keep track of the spec's requirement that we wait for ongoing writes during shutdown.\n  let currentWrite = promiseResolvedWith<void>(undefined);\n\n  return newPromise((resolve, reject) => {\n    let abortAlgorithm: () => void;\n    if (signal !== undefined) {\n      abortAlgorithm = () => {\n        const error = new DOMException('Aborted', 'AbortError');\n        const actions: Array<() => Promise<void>> = [];\n        if (!preventAbort) {\n          actions.push(() => {\n            if (dest._state === 'writable') {\n              return WritableStreamAbort(dest, error);\n            }\n            return promiseResolvedWith(undefined);\n          });\n        }\n        if (!preventCancel) {\n          actions.push(() => {\n            if (source._state === 'readable') {\n              return ReadableStreamCancel(source, error);\n            }\n            return promiseResolvedWith(undefined);\n          });\n        }\n        shutdownWithAction(() => Promise.all(actions.map(action => action())), true, error);\n      };\n\n      if (signal.aborted) {\n        abortAlgorithm();\n        return;\n      }\n\n      signal.addEventListener('abort', abortAlgorithm);\n    }\n\n    // Using reader and writer, read all chunks from this and write them to dest\n    // - Backpressure must be enforced\n    // - Shutdown must stop all activity\n    function pipeLoop() {\n      return newPromise<void>((resolveLoop, rejectLoop) => {\n        function next(done: boolean) {\n          if (done) {\n            resolveLoop();\n          } else {\n            // Use `PerformPromiseThen` instead of `uponPromise` to avoid\n            // adding unnecessary `.catch(rethrowAssertionErrorRejection)` handlers\n            PerformPromiseThen(pipeStep(), next, rejectLoop);\n          }\n        }\n\n        next(false);\n      });\n    }\n\n    function pipeStep(): Promise<boolean> {\n      if (shuttingDown) {\n        return promiseResolvedWith(true);\n      }\n\n      return PerformPromiseThen(writer._readyPromise, () => {\n        return newPromise<boolean>((resolveRead, rejectRead) => {\n          ReadableStreamDefaultReaderRead(\n            reader,\n            {\n              _chunkSteps: chunk => {\n                currentWrite = PerformPromiseThen(WritableStreamDefaultWriterWrite(writer, chunk), undefined, noop);\n                resolveRead(false);\n              },\n              _closeSteps: () => resolveRead(true),\n              _errorSteps: rejectRead\n            }\n          );\n        });\n      });\n    }\n\n    // Errors must be propagated forward\n    isOrBecomesErrored(source, reader._closedPromise, storedError => {\n      if (!preventAbort) {\n        shutdownWithAction(() => WritableStreamAbort(dest, storedError), true, storedError);\n      } else {\n        shutdown(true, storedError);\n      }\n    });\n\n    // Errors must be propagated backward\n    isOrBecomesErrored(dest, writer._closedPromise, storedError => {\n      if (!preventCancel) {\n        shutdownWithAction(() => ReadableStreamCancel(source, storedError), true, storedError);\n      } else {\n        shutdown(true, storedError);\n      }\n    });\n\n    // Closing must be propagated forward\n    isOrBecomesClosed(source, reader._closedPromise, () => {\n      if (!preventClose) {\n        shutdownWithAction(() => WritableStreamDefaultWriterCloseWithErrorPropagation(writer));\n      } else {\n        shutdown();\n      }\n    });\n\n    // Closing must be propagated backward\n    if (WritableStreamCloseQueuedOrInFlight(dest) || dest._state === 'closed') {\n      const destClosed = new TypeError('the destination writable stream closed before all data could be piped to it');\n\n      if (!preventCancel) {\n        shutdownWithAction(() => ReadableStreamCancel(source, destClosed), true, destClosed);\n      } else {\n        shutdown(true, destClosed);\n      }\n    }\n\n    setPromiseIsHandledToTrue(pipeLoop());\n\n    function waitForWritesToFinish(): Promise<void> {\n      // Another write may have started while we were waiting on this currentWrite, so we have to be sure to wait\n      // for that too.\n      const oldCurrentWrite = currentWrite;\n      return PerformPromiseThen(\n        currentWrite,\n        () => oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined\n      );\n    }\n\n    function isOrBecomesErrored(stream: ReadableStream | WritableStream,\n                                promise: Promise<void>,\n                                action: (reason: any) => void) {\n      if (stream._state === 'errored') {\n        action(stream._storedError);\n      } else {\n        uponRejection(promise, action);\n      }\n    }\n\n    function isOrBecomesClosed(stream: ReadableStream | WritableStream, promise: Promise<void>, action: () => void) {\n      if (stream._state === 'closed') {\n        action();\n      } else {\n        uponFulfillment(promise, action);\n      }\n    }\n\n    function shutdownWithAction(action: () => Promise<unknown>, originalIsError?: boolean, originalError?: any) {\n      if (shuttingDown) {\n        return;\n      }\n      shuttingDown = true;\n\n      if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {\n        uponFulfillment(waitForWritesToFinish(), doTheRest);\n      } else {\n        doTheRest();\n      }\n\n      function doTheRest() {\n        uponPromise(\n          action(),\n          () => finalize(originalIsError, originalError),\n          newError => finalize(true, newError)\n        );\n      }\n    }\n\n    function shutdown(isError?: boolean, error?: any) {\n      if (shuttingDown) {\n        return;\n      }\n      shuttingDown = true;\n\n      if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {\n        uponFulfillment(waitForWritesToFinish(), () => finalize(isError, error));\n      } else {\n        finalize(isError, error);\n      }\n    }\n\n    function finalize(isError?: boolean, error?: any) {\n      WritableStreamDefaultWriterRelease(writer);\n      ReadableStreamReaderGenericRelease(reader);\n\n      if (signal !== undefined) {\n        signal.removeEventListener('abort', abortAlgorithm);\n      }\n      if (isError) {\n        reject(error);\n      } else {\n        resolve(undefined);\n      }\n    }\n  });\n}\n","import { QueuingStrategySizeCallback } from '../queuing-strategy';\nimport assert from '../../stub/assert';\nimport { DequeueValue, EnqueueValueWithSize, QueuePair, ResetQueue } from '../abstract-ops/queue-with-sizes';\nimport {\n  ReadableStreamAddReadRequest,\n  ReadableStreamFulfillReadRequest,\n  ReadableStreamGetNumReadRequests,\n  ReadRequest\n} from './default-reader';\nimport { SimpleQueue } from '../simple-queue';\nimport { IsReadableStreamLocked, ReadableStream, ReadableStreamClose, ReadableStreamError } from '../readable-stream';\nimport { ValidatedUnderlyingSource } from './underlying-source';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { CancelSteps, PullSteps } from '../abstract-ops/internal-methods';\nimport { promiseResolvedWith, uponPromise } from '../helpers/webidl';\n\n/**\n * Allows control of a {@link ReadableStream | readable stream}'s state and internal queue.\n *\n * @public\n */\nexport class ReadableStreamDefaultController<R> {\n  /** @internal */\n  _controlledReadableStream!: ReadableStream<R>;\n  /** @internal */\n  _queue!: SimpleQueue<QueuePair<R>>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _closeRequested!: boolean;\n  /** @internal */\n  _pullAgain!: boolean;\n  /** @internal */\n  _pulling !: boolean;\n  /** @internal */\n  _strategySizeAlgorithm!: QueuingStrategySizeCallback<R>;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _pullAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _cancelAlgorithm!: (reason: any) => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is\n   * over-full. An underlying source ought to use this information to determine when and how to apply backpressure.\n   */\n  get desiredSize(): number | null {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('desiredSize');\n    }\n\n    return ReadableStreamDefaultControllerGetDesiredSize(this);\n  }\n\n  /**\n   * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from\n   * the stream, but once those are read, the stream will become closed.\n   */\n  close(): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('close');\n    }\n\n    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {\n      throw new TypeError('The stream is not in a state that permits close');\n    }\n\n    ReadableStreamDefaultControllerClose(this);\n  }\n\n  /**\n   * Enqueues the given chunk `chunk` in the controlled readable stream.\n   */\n  enqueue(chunk: R): void;\n  enqueue(chunk: R = undefined!): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('enqueue');\n    }\n\n    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {\n      throw new TypeError('The stream is not in a state that permits enqueue');\n    }\n\n    return ReadableStreamDefaultControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.\n   */\n  error(e: any = undefined): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n\n    ReadableStreamDefaultControllerError(this, e);\n  }\n\n  /** @internal */\n  [CancelSteps](reason: any): Promise<void> {\n    ResetQueue(this);\n    const result = this._cancelAlgorithm(reason);\n    ReadableStreamDefaultControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [PullSteps](readRequest: ReadRequest<R>): void {\n    const stream = this._controlledReadableStream;\n\n    if (this._queue.length > 0) {\n      const chunk = DequeueValue(this);\n\n      if (this._closeRequested && this._queue.length === 0) {\n        ReadableStreamDefaultControllerClearAlgorithms(this);\n        ReadableStreamClose(stream);\n      } else {\n        ReadableStreamDefaultControllerCallPullIfNeeded(this);\n      }\n\n      readRequest._chunkSteps(chunk);\n    } else {\n      ReadableStreamAddReadRequest(stream, readRequest);\n      ReadableStreamDefaultControllerCallPullIfNeeded(this);\n    }\n  }\n}\n\nObject.defineProperties(ReadableStreamDefaultController.prototype, {\n  close: { enumerable: true },\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Abstract operations for the ReadableStreamDefaultController.\n\nfunction IsReadableStreamDefaultController<R = any>(x: any): x is ReadableStreamDefaultController<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableStream')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamDefaultController;\n}\n\nfunction ReadableStreamDefaultControllerCallPullIfNeeded(controller: ReadableStreamDefaultController<any>): void {\n  const shouldPull = ReadableStreamDefaultControllerShouldCallPull(controller);\n  if (!shouldPull) {\n    return;\n  }\n\n  if (controller._pulling) {\n    controller._pullAgain = true;\n    return;\n  }\n\n  assert(!controller._pullAgain);\n\n  controller._pulling = true;\n\n  const pullPromise = controller._pullAlgorithm();\n  uponPromise(\n    pullPromise,\n    () => {\n      controller._pulling = false;\n\n      if (controller._pullAgain) {\n        controller._pullAgain = false;\n        ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n      }\n    },\n    e => {\n      ReadableStreamDefaultControllerError(controller, e);\n    }\n  );\n}\n\nfunction ReadableStreamDefaultControllerShouldCallPull(controller: ReadableStreamDefaultController<any>): boolean {\n  const stream = controller._controlledReadableStream;\n\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return false;\n  }\n\n  if (!controller._started) {\n    return false;\n  }\n\n  if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    return true;\n  }\n\n  const desiredSize = ReadableStreamDefaultControllerGetDesiredSize(controller);\n  assert(desiredSize !== null);\n  if (desiredSize! > 0) {\n    return true;\n  }\n\n  return false;\n}\n\nfunction ReadableStreamDefaultControllerClearAlgorithms(controller: ReadableStreamDefaultController<any>) {\n  controller._pullAlgorithm = undefined!;\n  controller._cancelAlgorithm = undefined!;\n  controller._strategySizeAlgorithm = undefined!;\n}\n\n// A client of ReadableStreamDefaultController may use these functions directly to bypass state check.\n\nexport function ReadableStreamDefaultControllerClose(controller: ReadableStreamDefaultController<any>) {\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return;\n  }\n\n  const stream = controller._controlledReadableStream;\n\n  controller._closeRequested = true;\n\n  if (controller._queue.length === 0) {\n    ReadableStreamDefaultControllerClearAlgorithms(controller);\n    ReadableStreamClose(stream);\n  }\n}\n\nexport function ReadableStreamDefaultControllerEnqueue<R>(\n  controller: ReadableStreamDefaultController<R>,\n  chunk: R\n): void {\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return;\n  }\n\n  const stream = controller._controlledReadableStream;\n\n  if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    ReadableStreamFulfillReadRequest(stream, chunk, false);\n  } else {\n    let chunkSize;\n    try {\n      chunkSize = controller._strategySizeAlgorithm(chunk);\n    } catch (chunkSizeE) {\n      ReadableStreamDefaultControllerError(controller, chunkSizeE);\n      throw chunkSizeE;\n    }\n\n    try {\n      EnqueueValueWithSize(controller, chunk, chunkSize);\n    } catch (enqueueE) {\n      ReadableStreamDefaultControllerError(controller, enqueueE);\n      throw enqueueE;\n    }\n  }\n\n  ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n}\n\nexport function ReadableStreamDefaultControllerError(controller: ReadableStreamDefaultController<any>, e: any) {\n  const stream = controller._controlledReadableStream;\n\n  if (stream._state !== 'readable') {\n    return;\n  }\n\n  ResetQueue(controller);\n\n  ReadableStreamDefaultControllerClearAlgorithms(controller);\n  ReadableStreamError(stream, e);\n}\n\nexport function ReadableStreamDefaultControllerGetDesiredSize(\n  controller: ReadableStreamDefaultController<any>\n): number | null {\n  const state = controller._controlledReadableStream._state;\n\n  if (state === 'errored') {\n    return null;\n  }\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\n// This is used in the implementation of TransformStream.\nexport function ReadableStreamDefaultControllerHasBackpressure(\n  controller: ReadableStreamDefaultController<any>\n): boolean {\n  if (ReadableStreamDefaultControllerShouldCallPull(controller)) {\n    return false;\n  }\n\n  return true;\n}\n\nexport function ReadableStreamDefaultControllerCanCloseOrEnqueue(\n  controller: ReadableStreamDefaultController<any>\n): boolean {\n  const state = controller._controlledReadableStream._state;\n\n  if (!controller._closeRequested && state === 'readable') {\n    return true;\n  }\n\n  return false;\n}\n\nexport function SetUpReadableStreamDefaultController<R>(stream: ReadableStream<R>,\n                                                        controller: ReadableStreamDefaultController<R>,\n                                                        startAlgorithm: () => void | PromiseLike<void>,\n                                                        pullAlgorithm: () => Promise<void>,\n                                                        cancelAlgorithm: (reason: any) => Promise<void>,\n                                                        highWaterMark: number,\n                                                        sizeAlgorithm: QueuingStrategySizeCallback<R>) {\n  assert(stream._readableStreamController === undefined);\n\n  controller._controlledReadableStream = stream;\n\n  controller._queue = undefined!;\n  controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._started = false;\n  controller._closeRequested = false;\n  controller._pullAgain = false;\n  controller._pulling = false;\n\n  controller._strategySizeAlgorithm = sizeAlgorithm;\n  controller._strategyHWM = highWaterMark;\n\n  controller._pullAlgorithm = pullAlgorithm;\n  controller._cancelAlgorithm = cancelAlgorithm;\n\n  stream._readableStreamController = controller;\n\n  const startResult = startAlgorithm();\n  uponPromise(\n    promiseResolvedWith(startResult),\n    () => {\n      controller._started = true;\n\n      assert(!controller._pulling);\n      assert(!controller._pullAgain);\n\n      ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n    },\n    r => {\n      ReadableStreamDefaultControllerError(controller, r);\n    }\n  );\n}\n\nexport function SetUpReadableStreamDefaultControllerFromUnderlyingSource<R>(\n  stream: ReadableStream<R>,\n  underlyingSource: ValidatedUnderlyingSource<R>,\n  highWaterMark: number,\n  sizeAlgorithm: QueuingStrategySizeCallback<R>\n) {\n  const controller: ReadableStreamDefaultController<R> = Object.create(ReadableStreamDefaultController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let pullAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let cancelAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingSource.start !== undefined) {\n    startAlgorithm = () => underlyingSource.start!(controller);\n  }\n  if (underlyingSource.pull !== undefined) {\n    pullAlgorithm = () => underlyingSource.pull!(controller);\n  }\n  if (underlyingSource.cancel !== undefined) {\n    cancelAlgorithm = reason => underlyingSource.cancel!(reason);\n  }\n\n  SetUpReadableStreamDefaultController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm\n  );\n}\n\n// Helper functions for the ReadableStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamDefaultController.prototype.${name} can only be used on a ReadableStreamDefaultController`);\n}\n","import {\n  CreateReadableByteStream,\n  CreateReadableStream,\n  IsReadableStream,\n  ReadableByteStream,\n  ReadableStream,\n  ReadableStreamCancel,\n  ReadableStreamReader\n} from '../readable-stream';\nimport { ReadableStreamReaderGenericRelease } from './generic-reader';\nimport {\n  AcquireReadableStreamDefaultReader,\n  IsReadableStreamDefaultReader,\n  ReadableStreamDefaultReaderRead,\n  ReadRequest\n} from './default-reader';\nimport {\n  AcquireReadableStreamBYOBReader,\n  IsReadableStreamBYOBReader,\n  ReadableStreamBYOBReaderRead,\n  ReadIntoRequest\n} from './byob-reader';\nimport assert from '../../stub/assert';\nimport { newPromise, promiseResolvedWith, queueMicrotask, uponRejection } from '../helpers/webidl';\nimport {\n  ReadableStreamDefaultController,\n  ReadableStreamDefaultControllerClose,\n  ReadableStreamDefaultControllerEnqueue,\n  ReadableStreamDefaultControllerError\n} from './default-controller';\nimport {\n  IsReadableByteStreamController,\n  ReadableByteStreamControllerClose,\n  ReadableByteStreamControllerEnqueue,\n  ReadableByteStreamControllerError,\n  ReadableByteStreamControllerGetBYOBRequest,\n  ReadableByteStreamControllerRespond,\n  ReadableByteStreamControllerRespondWithNewView\n} from './byte-stream-controller';\nimport { CreateArrayFromList } from '../abstract-ops/ecmascript';\nimport { CloneAsUint8Array } from '../abstract-ops/miscellaneous';\n\nexport function ReadableStreamTee<R>(stream: ReadableStream<R>,\n                                     cloneForBranch2: boolean): [ReadableStream<R>, ReadableStream<R>] {\n  assert(IsReadableStream(stream));\n  assert(typeof cloneForBranch2 === 'boolean');\n  if (IsReadableByteStreamController(stream._readableStreamController)) {\n    return ReadableByteStreamTee(stream as unknown as ReadableByteStream) as\n      unknown as [ReadableStream<R>, ReadableStream<R>];\n  }\n  return ReadableStreamDefaultTee(stream, cloneForBranch2);\n}\n\nexport function ReadableStreamDefaultTee<R>(stream: ReadableStream<R>,\n                                            cloneForBranch2: boolean): [ReadableStream<R>, ReadableStream<R>] {\n  assert(IsReadableStream(stream));\n  assert(typeof cloneForBranch2 === 'boolean');\n\n  const reader = AcquireReadableStreamDefaultReader<R>(stream);\n\n  let reading = false;\n  let readAgain = false;\n  let canceled1 = false;\n  let canceled2 = false;\n  let reason1: any;\n  let reason2: any;\n  let branch1: ReadableStream<R>;\n  let branch2: ReadableStream<R>;\n\n  let resolveCancelPromise: (value: undefined | Promise<undefined>) => void;\n  const cancelPromise = newPromise<undefined>(resolve => {\n    resolveCancelPromise = resolve;\n  });\n\n  function pullAlgorithm(): Promise<void> {\n    if (reading) {\n      readAgain = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgain = false;\n          const chunk1 = chunk;\n          const chunk2 = chunk;\n\n          // There is no way to access the cloning code right now in the reference implementation.\n          // If we add one then we'll need an implementation for serializable objects.\n          // if (!canceled2 && cloneForBranch2) {\n          //   chunk2 = StructuredDeserialize(StructuredSerialize(chunk2));\n          // }\n\n          if (!canceled1) {\n            ReadableStreamDefaultControllerEnqueue(\n              branch1._readableStreamController as ReadableStreamDefaultController<R>,\n              chunk1\n            );\n          }\n          if (!canceled2) {\n            ReadableStreamDefaultControllerEnqueue(\n              branch2._readableStreamController as ReadableStreamDefaultController<R>,\n              chunk2\n            );\n          }\n\n          reading = false;\n          if (readAgain) {\n            pullAlgorithm();\n          }\n        });\n      },\n      _closeSteps: () => {\n        reading = false;\n        if (!canceled1) {\n          ReadableStreamDefaultControllerClose(branch1._readableStreamController as ReadableStreamDefaultController<R>);\n        }\n        if (!canceled2) {\n          ReadableStreamDefaultControllerClose(branch2._readableStreamController as ReadableStreamDefaultController<R>);\n        }\n\n        if (!canceled1 || !canceled2) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function cancel1Algorithm(reason: any): Promise<void> {\n    canceled1 = true;\n    reason1 = reason;\n    if (canceled2) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function cancel2Algorithm(reason: any): Promise<void> {\n    canceled2 = true;\n    reason2 = reason;\n    if (canceled1) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function startAlgorithm() {\n    // do nothing\n  }\n\n  branch1 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel1Algorithm);\n  branch2 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel2Algorithm);\n\n  uponRejection(reader._closedPromise, (r: any) => {\n    ReadableStreamDefaultControllerError(branch1._readableStreamController as ReadableStreamDefaultController<R>, r);\n    ReadableStreamDefaultControllerError(branch2._readableStreamController as ReadableStreamDefaultController<R>, r);\n    if (!canceled1 || !canceled2) {\n      resolveCancelPromise(undefined);\n    }\n  });\n\n  return [branch1, branch2];\n}\n\nexport function ReadableByteStreamTee(stream: ReadableByteStream): [ReadableByteStream, ReadableByteStream] {\n  assert(IsReadableStream(stream));\n  assert(IsReadableByteStreamController(stream._readableStreamController));\n\n  let reader: ReadableStreamReader<Uint8Array> = AcquireReadableStreamDefaultReader(stream);\n  let reading = false;\n  let readAgainForBranch1 = false;\n  let readAgainForBranch2 = false;\n  let canceled1 = false;\n  let canceled2 = false;\n  let reason1: any;\n  let reason2: any;\n  let branch1: ReadableByteStream;\n  let branch2: ReadableByteStream;\n\n  let resolveCancelPromise: (value: undefined | Promise<undefined>) => void;\n  const cancelPromise = newPromise<void>(resolve => {\n    resolveCancelPromise = resolve;\n  });\n\n  function forwardReaderError(thisReader: ReadableStreamReader<Uint8Array>) {\n    uponRejection(thisReader._closedPromise, r => {\n      if (thisReader !== reader) {\n        return;\n      }\n      ReadableByteStreamControllerError(branch1._readableStreamController, r);\n      ReadableByteStreamControllerError(branch2._readableStreamController, r);\n      if (!canceled1 || !canceled2) {\n        resolveCancelPromise(undefined);\n      }\n    });\n  }\n\n  function pullWithDefaultReader() {\n    if (IsReadableStreamBYOBReader(reader)) {\n      assert(reader._readIntoRequests.length === 0);\n      ReadableStreamReaderGenericRelease(reader);\n\n      reader = AcquireReadableStreamDefaultReader(stream);\n      forwardReaderError(reader);\n    }\n\n    const readRequest: ReadRequest<Uint8Array> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgainForBranch1 = false;\n          readAgainForBranch2 = false;\n\n          const chunk1 = chunk;\n          let chunk2 = chunk;\n          if (!canceled1 && !canceled2) {\n            try {\n              chunk2 = CloneAsUint8Array(chunk);\n            } catch (cloneE) {\n              ReadableByteStreamControllerError(branch1._readableStreamController, cloneE);\n              ReadableByteStreamControllerError(branch2._readableStreamController, cloneE);\n              resolveCancelPromise(ReadableStreamCancel(stream, cloneE));\n              return;\n            }\n          }\n\n          if (!canceled1) {\n            ReadableByteStreamControllerEnqueue(branch1._readableStreamController, chunk1);\n          }\n          if (!canceled2) {\n            ReadableByteStreamControllerEnqueue(branch2._readableStreamController, chunk2);\n          }\n\n          reading = false;\n          if (readAgainForBranch1) {\n            pull1Algorithm();\n          } else if (readAgainForBranch2) {\n            pull2Algorithm();\n          }\n        });\n      },\n      _closeSteps: () => {\n        reading = false;\n        if (!canceled1) {\n          ReadableByteStreamControllerClose(branch1._readableStreamController);\n        }\n        if (!canceled2) {\n          ReadableByteStreamControllerClose(branch2._readableStreamController);\n        }\n        if (branch1._readableStreamController._pendingPullIntos.length > 0) {\n          ReadableByteStreamControllerRespond(branch1._readableStreamController, 0);\n        }\n        if (branch2._readableStreamController._pendingPullIntos.length > 0) {\n          ReadableByteStreamControllerRespond(branch2._readableStreamController, 0);\n        }\n        if (!canceled1 || !canceled2) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n  }\n\n  function pullWithBYOBReader(view: ArrayBufferView, forBranch2: boolean) {\n    if (IsReadableStreamDefaultReader<Uint8Array>(reader)) {\n      assert(reader._readRequests.length === 0);\n      ReadableStreamReaderGenericRelease(reader);\n\n      reader = AcquireReadableStreamBYOBReader(stream);\n      forwardReaderError(reader);\n    }\n\n    const byobBranch = forBranch2 ? branch2 : branch1;\n    const otherBranch = forBranch2 ? branch1 : branch2;\n\n    const readIntoRequest: ReadIntoRequest<ArrayBufferView> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgainForBranch1 = false;\n          readAgainForBranch2 = false;\n\n          const byobCanceled = forBranch2 ? canceled2 : canceled1;\n          const otherCanceled = forBranch2 ? canceled1 : canceled2;\n\n          if (!otherCanceled) {\n            let clonedChunk;\n            try {\n              clonedChunk = CloneAsUint8Array(chunk);\n            } catch (cloneE) {\n              ReadableByteStreamControllerError(byobBranch._readableStreamController, cloneE);\n              ReadableByteStreamControllerError(otherBranch._readableStreamController, cloneE);\n              resolveCancelPromise(ReadableStreamCancel(stream, cloneE));\n              return;\n            }\n            if (!byobCanceled) {\n              ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n            }\n            ReadableByteStreamControllerEnqueue(otherBranch._readableStreamController, clonedChunk);\n          } else if (!byobCanceled) {\n            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n          }\n\n          reading = false;\n          if (readAgainForBranch1) {\n            pull1Algorithm();\n          } else if (readAgainForBranch2) {\n            pull2Algorithm();\n          }\n        });\n      },\n      _closeSteps: chunk => {\n        reading = false;\n\n        const byobCanceled = forBranch2 ? canceled2 : canceled1;\n        const otherCanceled = forBranch2 ? canceled1 : canceled2;\n\n        if (!byobCanceled) {\n          ReadableByteStreamControllerClose(byobBranch._readableStreamController);\n        }\n        if (!otherCanceled) {\n          ReadableByteStreamControllerClose(otherBranch._readableStreamController);\n        }\n\n        if (chunk !== undefined) {\n          assert(chunk.byteLength === 0);\n\n          if (!byobCanceled) {\n            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n          }\n          if (!otherCanceled && otherBranch._readableStreamController._pendingPullIntos.length > 0) {\n            ReadableByteStreamControllerRespond(otherBranch._readableStreamController, 0);\n          }\n        }\n\n        if (!byobCanceled || !otherCanceled) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamBYOBReaderRead(reader, view, readIntoRequest);\n  }\n\n  function pull1Algorithm(): Promise<void> {\n    if (reading) {\n      readAgainForBranch1 = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch1._readableStreamController);\n    if (byobRequest === null) {\n      pullWithDefaultReader();\n    } else {\n      pullWithBYOBReader(byobRequest._view!, false);\n    }\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function pull2Algorithm(): Promise<void> {\n    if (reading) {\n      readAgainForBranch2 = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch2._readableStreamController);\n    if (byobRequest === null) {\n      pullWithDefaultReader();\n    } else {\n      pullWithBYOBReader(byobRequest._view!, true);\n    }\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function cancel1Algorithm(reason: any): Promise<void> {\n    canceled1 = true;\n    reason1 = reason;\n    if (canceled2) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function cancel2Algorithm(reason: any): Promise<void> {\n    canceled2 = true;\n    reason2 = reason;\n    if (canceled1) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function startAlgorithm(): void {\n    return;\n  }\n\n  branch1 = CreateReadableByteStream(startAlgorithm, pull1Algorithm, cancel1Algorithm);\n  branch2 = CreateReadableByteStream(startAlgorithm, pull2Algorithm, cancel2Algorithm);\n\n  forwardReaderError(reader);\n\n  return [branch1, branch2];\n}\n","import { assertDictionary, assertFunction, convertUnsignedLongLongWithEnforceRange } from './basic';\nimport {\n  ReadableStreamController,\n  UnderlyingByteSource,\n  UnderlyingDefaultOrByteSource,\n  UnderlyingDefaultOrByteSourcePullCallback,\n  UnderlyingDefaultOrByteSourceStartCallback,\n  UnderlyingSource,\n  UnderlyingSourceCancelCallback,\n  ValidatedUnderlyingDefaultOrByteSource\n} from '../readable-stream/underlying-source';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\n\nexport function convertUnderlyingDefaultOrByteSource<R>(\n  source: UnderlyingSource<R> | UnderlyingByteSource | null,\n  context: string\n): ValidatedUnderlyingDefaultOrByteSource<R> {\n  assertDictionary(source, context);\n  const original = source as (UnderlyingDefaultOrByteSource<R> | null);\n  const autoAllocateChunkSize = original?.autoAllocateChunkSize;\n  const cancel = original?.cancel;\n  const pull = original?.pull;\n  const start = original?.start;\n  const type = original?.type;\n  return {\n    autoAllocateChunkSize: autoAllocateChunkSize === undefined ?\n      undefined :\n      convertUnsignedLongLongWithEnforceRange(\n        autoAllocateChunkSize,\n        `${context} has member 'autoAllocateChunkSize' that`\n      ),\n    cancel: cancel === undefined ?\n      undefined :\n      convertUnderlyingSourceCancelCallback(cancel, original!, `${context} has member 'cancel' that`),\n    pull: pull === undefined ?\n      undefined :\n      convertUnderlyingSourcePullCallback(pull, original!, `${context} has member 'pull' that`),\n    start: start === undefined ?\n      undefined :\n      convertUnderlyingSourceStartCallback(start, original!, `${context} has member 'start' that`),\n    type: type === undefined ? undefined : convertReadableStreamType(type, `${context} has member 'type' that`)\n  };\n}\n\nfunction convertUnderlyingSourceCancelCallback(\n  fn: UnderlyingSourceCancelCallback,\n  original: UnderlyingDefaultOrByteSource,\n  context: string\n): (reason: any) => Promise<void> {\n  assertFunction(fn, context);\n  return (reason: any) => promiseCall(fn, original, [reason]);\n}\n\nfunction convertUnderlyingSourcePullCallback<R>(\n  fn: UnderlyingDefaultOrByteSourcePullCallback<R>,\n  original: UnderlyingDefaultOrByteSource<R>,\n  context: string\n): (controller: ReadableStreamController<R>) => Promise<void> {\n  assertFunction(fn, context);\n  return (controller: ReadableStreamController<R>) => promiseCall(fn, original, [controller]);\n}\n\nfunction convertUnderlyingSourceStartCallback<R>(\n  fn: UnderlyingDefaultOrByteSourceStartCallback<R>,\n  original: UnderlyingDefaultOrByteSource<R>,\n  context: string\n): UnderlyingDefaultOrByteSourceStartCallback<R> {\n  assertFunction(fn, context);\n  return (controller: ReadableStreamController<R>) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertReadableStreamType(type: string, context: string): 'bytes' {\n  type = `${type}`;\n  if (type !== 'bytes') {\n    throw new TypeError(`${context} '${type}' is not a valid enumeration value for ReadableStreamType`);\n  }\n  return type;\n}\n","import { assertDictionary } from './basic';\nimport { ReadableStreamGetReaderOptions } from '../readable-stream/reader-options';\n\nexport function convertReaderOptions(options: ReadableStreamGetReaderOptions | null | undefined,\n                                     context: string): ReadableStreamGetReaderOptions {\n  assertDictionary(options, context);\n  const mode = options?.mode;\n  return {\n    mode: mode === undefined ? undefined : convertReadableStreamReaderMode(mode, `${context} has member 'mode' that`)\n  };\n}\n\nfunction convertReadableStreamReaderMode(mode: string, context: string): 'byob' {\n  mode = `${mode}`;\n  if (mode !== 'byob') {\n    throw new TypeError(`${context} '${mode}' is not a valid enumeration value for ReadableStreamReaderMode`);\n  }\n  return mode;\n}\n","import { assertDictionary } from './basic';\nimport {\n  ReadableStreamIteratorOptions,\n  ValidatedReadableStreamIteratorOptions\n} from '../readable-stream/iterator-options';\n\nexport function convertIteratorOptions(options: ReadableStreamIteratorOptions | null | undefined,\n                                       context: string): ValidatedReadableStreamIteratorOptions {\n  assertDictionary(options, context);\n  const preventCancel = options?.preventCancel;\n  return { preventCancel: Boolean(preventCancel) };\n}\n","import { assertDictionary } from './basic';\nimport { StreamPipeOptions, ValidatedStreamPipeOptions } from '../readable-stream/pipe-options';\nimport { AbortSignal, isAbortSignal } from '../abort-signal';\n\nexport function convertPipeOptions(options: StreamPipeOptions | null | undefined,\n                                   context: string): ValidatedStreamPipeOptions {\n  assertDictionary(options, context);\n  const preventAbort = options?.preventAbort;\n  const preventCancel = options?.preventCancel;\n  const preventClose = options?.preventClose;\n  const signal = options?.signal;\n  if (signal !== undefined) {\n    assertAbortSignal(signal, `${context} has member 'signal' that`);\n  }\n  return {\n    preventAbort: Boolean(preventAbort),\n    preventCancel: Boolean(preventCancel),\n    preventClose: Boolean(preventClose),\n    signal\n  };\n}\n\nfunction assertAbortSignal(signal: unknown, context: string): asserts signal is AbortSignal {\n  if (!isAbortSignal(signal)) {\n    throw new TypeError(`${context} is not an AbortSignal.`);\n  }\n}\n","import { assertDictionary, assertRequiredField } from './basic';\nimport { ReadableStream } from '../readable-stream';\nimport { WritableStream } from '../writable-stream';\nimport { assertReadableStream } from './readable-stream';\nimport { assertWritableStream } from './writable-stream';\n\nexport function convertReadableWritablePair<RS extends ReadableStream, WS extends WritableStream>(\n  pair: { readable: RS; writable: WS } | null | undefined,\n  context: string\n): { readable: RS; writable: WS } {\n  assertDictionary(pair, context);\n\n  const readable = pair?.readable;\n  assertRequiredField(readable, 'readable', 'ReadableWritablePair');\n  assertReadableStream(readable, `${context} has member 'readable' that`);\n\n  const writable = pair?.writable;\n  assertRequiredField(writable, 'writable', 'ReadableWritablePair');\n  assertWritableStream(writable, `${context} has member 'writable' that`);\n\n  return { readable, writable };\n}\n","import assert from '../stub/assert';\nimport {\n  promiseRejectedWith,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  transformPromiseWith\n} from './helpers/webidl';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { AcquireReadableStreamAsyncIterator, ReadableStreamAsyncIterator } from './readable-stream/async-iterator';\nimport { defaultReaderClosedPromiseReject, defaultReaderClosedPromiseResolve } from './readable-stream/generic-reader';\nimport {\n  AcquireReadableStreamDefaultReader,\n  IsReadableStreamDefaultReader,\n  ReadableStreamDefaultReader,\n  ReadableStreamDefaultReadResult\n} from './readable-stream/default-reader';\nimport {\n  AcquireReadableStreamBYOBReader,\n  IsReadableStreamBYOBReader,\n  ReadableStreamBYOBReader,\n  ReadableStreamBYOBReadResult\n} from './readable-stream/byob-reader';\nimport { ReadableStreamPipeTo } from './readable-stream/pipe';\nimport { ReadableStreamTee } from './readable-stream/tee';\nimport { IsWritableStream, IsWritableStreamLocked, WritableStream } from './writable-stream';\nimport { SimpleQueue } from './simple-queue';\nimport {\n  ReadableByteStreamController,\n  ReadableStreamBYOBRequest,\n  SetUpReadableByteStreamController,\n  SetUpReadableByteStreamControllerFromUnderlyingSource\n} from './readable-stream/byte-stream-controller';\nimport {\n  ReadableStreamDefaultController,\n  SetUpReadableStreamDefaultController,\n  SetUpReadableStreamDefaultControllerFromUnderlyingSource\n} from './readable-stream/default-controller';\nimport {\n  UnderlyingByteSource,\n  UnderlyingByteSourcePullCallback,\n  UnderlyingByteSourceStartCallback,\n  UnderlyingSource,\n  UnderlyingSourceCancelCallback,\n  UnderlyingSourcePullCallback,\n  UnderlyingSourceStartCallback\n} from './readable-stream/underlying-source';\nimport { noop } from '../utils';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { CreateArrayFromList } from './abstract-ops/ecmascript';\nimport { CancelSteps } from './abstract-ops/internal-methods';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { assertObject, assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport { convertUnderlyingDefaultOrByteSource } from './validators/underlying-source';\nimport { ReadableStreamGetReaderOptions } from './readable-stream/reader-options';\nimport { convertReaderOptions } from './validators/reader-options';\nimport { StreamPipeOptions, ValidatedStreamPipeOptions } from './readable-stream/pipe-options';\nimport { ReadableStreamIteratorOptions } from './readable-stream/iterator-options';\nimport { convertIteratorOptions } from './validators/iterator-options';\nimport { convertPipeOptions } from './validators/pipe-options';\nimport { ReadableWritablePair } from './readable-stream/readable-writable-pair';\nimport { convertReadableWritablePair } from './validators/readable-writable-pair';\n\nexport type ReadableByteStream = ReadableStream<Uint8Array> & {\n  _readableStreamController: ReadableByteStreamController\n};\n\ntype ReadableStreamState = 'readable' | 'closed' | 'errored';\n\n/**\n * A readable stream represents a source of data, from which you can read.\n *\n * @public\n */\nexport class ReadableStream<R = any> {\n  /** @internal */\n  _state!: ReadableStreamState;\n  /** @internal */\n  _reader: ReadableStreamReader<R> | undefined;\n  /** @internal */\n  _storedError: any;\n  /** @internal */\n  _disturbed!: boolean;\n  /** @internal */\n  _readableStreamController!: ReadableStreamDefaultController<R> | ReadableByteStreamController;\n\n  constructor(underlyingSource: UnderlyingByteSource, strategy?: { highWaterMark?: number; size?: undefined });\n  constructor(underlyingSource?: UnderlyingSource<R>, strategy?: QueuingStrategy<R>);\n  constructor(rawUnderlyingSource: UnderlyingSource<R> | UnderlyingByteSource | null | undefined = {},\n              rawStrategy: QueuingStrategy<R> | null | undefined = {}) {\n    if (rawUnderlyingSource === undefined) {\n      rawUnderlyingSource = null;\n    } else {\n      assertObject(rawUnderlyingSource, 'First parameter');\n    }\n\n    const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');\n    const underlyingSource = convertUnderlyingDefaultOrByteSource(rawUnderlyingSource, 'First parameter');\n\n    InitializeReadableStream(this);\n\n    if (underlyingSource.type === 'bytes') {\n      if (strategy.size !== undefined) {\n        throw new RangeError('The strategy for a byte stream cannot have a size function');\n      }\n      const highWaterMark = ExtractHighWaterMark(strategy, 0);\n      SetUpReadableByteStreamControllerFromUnderlyingSource(\n        this as unknown as ReadableByteStream,\n        underlyingSource,\n        highWaterMark\n      );\n    } else {\n      assert(underlyingSource.type === undefined);\n      const sizeAlgorithm = ExtractSizeAlgorithm(strategy);\n      const highWaterMark = ExtractHighWaterMark(strategy, 1);\n      SetUpReadableStreamDefaultControllerFromUnderlyingSource(\n        this,\n        underlyingSource,\n        highWaterMark,\n        sizeAlgorithm\n      );\n    }\n  }\n\n  /**\n   * Whether or not the readable stream is locked to a {@link ReadableStreamDefaultReader | reader}.\n   */\n  get locked(): boolean {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('locked');\n    }\n\n    return IsReadableStreamLocked(this);\n  }\n\n  /**\n   * Cancels the stream, signaling a loss of interest in the stream by a consumer.\n   *\n   * The supplied `reason` argument will be given to the underlying source's {@link UnderlyingSource.cancel | cancel()}\n   * method, which might or might not use it.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('cancel'));\n    }\n\n    if (IsReadableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot cancel a stream that already has a reader'));\n    }\n\n    return ReadableStreamCancel(this, reason);\n  }\n\n  /**\n   * Creates a {@link ReadableStreamBYOBReader} and locks the stream to the new reader.\n   *\n   * This call behaves the same way as the no-argument variant, except that it only works on readable byte streams,\n   * i.e. streams which were constructed specifically with the ability to handle \"bring your own buffer\" reading.\n   * The returned BYOB reader provides the ability to directly read individual chunks from the stream via its\n   * {@link ReadableStreamBYOBReader.read | read()} method, into developer-supplied buffers, allowing more precise\n   * control over allocation.\n   */\n  getReader({ mode }: { mode: 'byob' }): ReadableStreamBYOBReader;\n  /**\n   * Creates a {@link ReadableStreamDefaultReader} and locks the stream to the new reader.\n   * While the stream is locked, no other reader can be acquired until this one is released.\n   *\n   * This functionality is especially useful for creating abstractions that desire the ability to consume a stream\n   * in its entirety. By getting a reader for the stream, you can ensure nobody else can interleave reads with yours\n   * or cancel the stream, which would interfere with your abstraction.\n   */\n  getReader(): ReadableStreamDefaultReader<R>;\n  getReader(\n    rawOptions: ReadableStreamGetReaderOptions | null | undefined = undefined\n  ): ReadableStreamDefaultReader<R> | ReadableStreamBYOBReader {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('getReader');\n    }\n\n    const options = convertReaderOptions(rawOptions, 'First parameter');\n\n    if (options.mode === undefined) {\n      return AcquireReadableStreamDefaultReader(this);\n    }\n\n    assert(options.mode === 'byob');\n    return AcquireReadableStreamBYOBReader(this as unknown as ReadableByteStream);\n  }\n\n  /**\n   * Provides a convenient, chainable way of piping this readable stream through a transform stream\n   * (or any other `{ writable, readable }` pair). It simply {@link ReadableStream.pipeTo | pipes} the stream\n   * into the writable side of the supplied pair, and returns the readable side for further use.\n   *\n   * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.\n   */\n  pipeThrough<RS extends ReadableStream>(\n    transform: { readable: RS; writable: WritableStream<R> },\n    options?: StreamPipeOptions\n  ): RS;\n  pipeThrough<RS extends ReadableStream>(\n    rawTransform: { readable: RS; writable: WritableStream<R> } | null | undefined,\n    rawOptions: StreamPipeOptions | null | undefined = {}\n  ): RS {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('pipeThrough');\n    }\n    assertRequiredArgument(rawTransform, 1, 'pipeThrough');\n\n    const transform = convertReadableWritablePair(rawTransform, 'First parameter');\n    const options = convertPipeOptions(rawOptions, 'Second parameter');\n\n    if (IsReadableStreamLocked(this)) {\n      throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked ReadableStream');\n    }\n    if (IsWritableStreamLocked(transform.writable)) {\n      throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked WritableStream');\n    }\n\n    const promise = ReadableStreamPipeTo(\n      this, transform.writable, options.preventClose, options.preventAbort, options.preventCancel, options.signal\n    );\n\n    setPromiseIsHandledToTrue(promise);\n\n    return transform.readable;\n  }\n\n  /**\n   * Pipes this readable stream to a given writable stream. The way in which the piping process behaves under\n   * various error conditions can be customized with a number of passed options. It returns a promise that fulfills\n   * when the piping process completes successfully, or rejects if any errors were encountered.\n   *\n   * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.\n   */\n  pipeTo(destination: WritableStream<R>, options?: StreamPipeOptions): Promise<void>;\n  pipeTo(destination: WritableStream<R> | null | undefined,\n         rawOptions: StreamPipeOptions | null | undefined = {}): Promise<void> {\n    if (!IsReadableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('pipeTo'));\n    }\n\n    if (destination === undefined) {\n      return promiseRejectedWith(`Parameter 1 is required in 'pipeTo'.`);\n    }\n    if (!IsWritableStream(destination)) {\n      return promiseRejectedWith(\n        new TypeError(`ReadableStream.prototype.pipeTo's first argument must be a WritableStream`)\n      );\n    }\n\n    let options: ValidatedStreamPipeOptions;\n    try {\n      options = convertPipeOptions(rawOptions, 'Second parameter');\n    } catch (e) {\n      return promiseRejectedWith(e);\n    }\n\n    if (IsReadableStreamLocked(this)) {\n      return promiseRejectedWith(\n        new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream')\n      );\n    }\n    if (IsWritableStreamLocked(destination)) {\n      return promiseRejectedWith(\n        new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream')\n      );\n    }\n\n    return ReadableStreamPipeTo<R>(\n      this, destination, options.preventClose, options.preventAbort, options.preventCancel, options.signal\n    );\n  }\n\n  /**\n   * Tees this readable stream, returning a two-element array containing the two resulting branches as\n   * new {@link ReadableStream} instances.\n   *\n   * Teeing a stream will lock it, preventing any other consumer from acquiring a reader.\n   * To cancel the stream, cancel both of the resulting branches; a composite cancellation reason will then be\n   * propagated to the stream's underlying source.\n   *\n   * Note that the chunks seen in each branch will be the same object. If the chunks are not immutable,\n   * this could allow interference between the two branches.\n   */\n  tee(): [ReadableStream<R>, ReadableStream<R>] {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('tee');\n    }\n\n    const branches = ReadableStreamTee(this, false);\n    return CreateArrayFromList(branches);\n  }\n\n  /**\n   * Asynchronously iterates over the chunks in the stream's internal queue.\n   *\n   * Asynchronously iterating over the stream will lock it, preventing any other consumer from acquiring a reader.\n   * The lock will be released if the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method\n   * is called, e.g. by breaking out of the loop.\n   *\n   * By default, calling the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method will also\n   * cancel the stream. To prevent this, use the stream's {@link ReadableStream.values | values()} method, passing\n   * `true` for the `preventCancel` option.\n   */\n  values(options?: ReadableStreamIteratorOptions): ReadableStreamAsyncIterator<R>;\n  values(rawOptions: ReadableStreamIteratorOptions | null | undefined = undefined): ReadableStreamAsyncIterator<R> {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('values');\n    }\n\n    const options = convertIteratorOptions(rawOptions, 'First parameter');\n    return AcquireReadableStreamAsyncIterator<R>(this, options.preventCancel);\n  }\n\n  /**\n   * {@inheritDoc ReadableStream.values}\n   */\n  [Symbol.asyncIterator]: (options?: ReadableStreamIteratorOptions) => ReadableStreamAsyncIterator<R>;\n}\n\nObject.defineProperties(ReadableStream.prototype, {\n  cancel: { enumerable: true },\n  getReader: { enumerable: true },\n  pipeThrough: { enumerable: true },\n  pipeTo: { enumerable: true },\n  tee: { enumerable: true },\n  values: { enumerable: true },\n  locked: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStream.prototype, Symbol.toStringTag, {\n    value: 'ReadableStream',\n    configurable: true\n  });\n}\nif (typeof Symbol.asyncIterator === 'symbol') {\n  Object.defineProperty(ReadableStream.prototype, Symbol.asyncIterator, {\n    value: ReadableStream.prototype.values,\n    writable: true,\n    configurable: true\n  });\n}\n\nexport {\n  ReadableStreamAsyncIterator,\n  ReadableStreamDefaultReadResult,\n  ReadableStreamBYOBReadResult,\n  UnderlyingByteSource,\n  UnderlyingSource,\n  UnderlyingSourceStartCallback,\n  UnderlyingSourcePullCallback,\n  UnderlyingSourceCancelCallback,\n  UnderlyingByteSourceStartCallback,\n  UnderlyingByteSourcePullCallback,\n  StreamPipeOptions,\n  ReadableWritablePair,\n  ReadableStreamIteratorOptions\n};\n\n// Abstract operations for the ReadableStream.\n\n// Throws if and only if startAlgorithm throws.\nexport function CreateReadableStream<R>(startAlgorithm: () => void | PromiseLike<void>,\n                                        pullAlgorithm: () => Promise<void>,\n                                        cancelAlgorithm: (reason: any) => Promise<void>,\n                                        highWaterMark = 1,\n                                        sizeAlgorithm: QueuingStrategySizeCallback<R> = () => 1): ReadableStream<R> {\n  assert(IsNonNegativeNumber(highWaterMark));\n\n  const stream: ReadableStream<R> = Object.create(ReadableStream.prototype);\n  InitializeReadableStream(stream);\n\n  const controller: ReadableStreamDefaultController<R> = Object.create(ReadableStreamDefaultController.prototype);\n  SetUpReadableStreamDefaultController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm\n  );\n\n  return stream;\n}\n\n// Throws if and only if startAlgorithm throws.\nexport function CreateReadableByteStream(\n  startAlgorithm: () => void | PromiseLike<void>,\n  pullAlgorithm: () => Promise<void>,\n  cancelAlgorithm: (reason: any) => Promise<void>\n): ReadableByteStream {\n  const stream: ReadableByteStream = Object.create(ReadableStream.prototype);\n  InitializeReadableStream(stream);\n\n  const controller: ReadableByteStreamController = Object.create(ReadableByteStreamController.prototype);\n  SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, 0, undefined);\n\n  return stream;\n}\n\nfunction InitializeReadableStream(stream: ReadableStream) {\n  stream._state = 'readable';\n  stream._reader = undefined;\n  stream._storedError = undefined;\n  stream._disturbed = false;\n}\n\nexport function IsReadableStream(x: unknown): x is ReadableStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readableStreamController')) {\n    return false;\n  }\n\n  return x instanceof ReadableStream;\n}\n\nexport function IsReadableStreamDisturbed(stream: ReadableStream): boolean {\n  assert(IsReadableStream(stream));\n\n  return stream._disturbed;\n}\n\nexport function IsReadableStreamLocked(stream: ReadableStream): boolean {\n  assert(IsReadableStream(stream));\n\n  if (stream._reader === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamCancel<R>(stream: ReadableStream<R>, reason: any): Promise<undefined> {\n  stream._disturbed = true;\n\n  if (stream._state === 'closed') {\n    return promiseResolvedWith(undefined);\n  }\n  if (stream._state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  ReadableStreamClose(stream);\n\n  const reader = stream._reader;\n  if (reader !== undefined && IsReadableStreamBYOBReader(reader)) {\n    reader._readIntoRequests.forEach(readIntoRequest => {\n      readIntoRequest._closeSteps(undefined);\n    });\n    reader._readIntoRequests = new SimpleQueue();\n  }\n\n  const sourceCancelPromise = stream._readableStreamController[CancelSteps](reason);\n  return transformPromiseWith(sourceCancelPromise, noop);\n}\n\nexport function ReadableStreamClose<R>(stream: ReadableStream<R>): void {\n  assert(stream._state === 'readable');\n\n  stream._state = 'closed';\n\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return;\n  }\n\n  defaultReaderClosedPromiseResolve(reader);\n\n  if (IsReadableStreamDefaultReader<R>(reader)) {\n    reader._readRequests.forEach(readRequest => {\n      readRequest._closeSteps();\n    });\n    reader._readRequests = new SimpleQueue();\n  }\n}\n\nexport function ReadableStreamError<R>(stream: ReadableStream<R>, e: any): void {\n  assert(IsReadableStream(stream));\n  assert(stream._state === 'readable');\n\n  stream._state = 'errored';\n  stream._storedError = e;\n\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return;\n  }\n\n  defaultReaderClosedPromiseReject(reader, e);\n\n  if (IsReadableStreamDefaultReader<R>(reader)) {\n    reader._readRequests.forEach(readRequest => {\n      readRequest._errorSteps(e);\n    });\n\n    reader._readRequests = new SimpleQueue();\n  } else {\n    assert(IsReadableStreamBYOBReader(reader));\n\n    reader._readIntoRequests.forEach(readIntoRequest => {\n      readIntoRequest._errorSteps(e);\n    });\n\n    reader._readIntoRequests = new SimpleQueue();\n  }\n}\n\n// Readers\n\nexport type ReadableStreamReader<R> = ReadableStreamDefaultReader<R> | ReadableStreamBYOBReader;\n\nexport {\n  ReadableStreamDefaultReader,\n  ReadableStreamBYOBReader\n};\n\n// Controllers\n\nexport {\n  ReadableStreamDefaultController,\n  ReadableStreamBYOBRequest,\n  ReadableByteStreamController\n};\n\n// Helper functions for the ReadableStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(`ReadableStream.prototype.${name} can only be used on a ReadableStream`);\n}\n","import { QueuingStrategyInit } from '../queuing-strategy';\nimport { assertDictionary, assertRequiredField, convertUnrestrictedDouble } from './basic';\n\nexport function convertQueuingStrategyInit(init: QueuingStrategyInit | null | undefined,\n                                           context: string): QueuingStrategyInit {\n  assertDictionary(init, context);\n  const highWaterMark = init?.highWaterMark;\n  assertRequiredField(highWaterMark, 'highWaterMark', 'QueuingStrategyInit');\n  return {\n    highWaterMark: convertUnrestrictedDouble(highWaterMark)\n  };\n}\n","import { QueuingStrategy, QueuingStrategyInit } from './queuing-strategy';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategyInit } from './validators/queuing-strategy-init';\n\n// The size function must not have a prototype property nor be a constructor\nconst byteLengthSizeFunction = (chunk: ArrayBufferView): number => {\n  return chunk.byteLength;\n};\ntry {\n  Object.defineProperty(byteLengthSizeFunction, 'name', {\n    value: 'size',\n    configurable: true\n  });\n} catch {\n  // This property is non-configurable in older browsers, so ignore if this throws.\n  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility\n}\n\n/**\n * A queuing strategy that counts the number of bytes in each chunk.\n *\n * @public\n */\nexport default class ByteLengthQueuingStrategy implements QueuingStrategy<ArrayBufferView> {\n  /** @internal */\n  readonly _byteLengthQueuingStrategyHighWaterMark: number;\n\n  constructor(options: QueuingStrategyInit) {\n    assertRequiredArgument(options, 1, 'ByteLengthQueuingStrategy');\n    options = convertQueuingStrategyInit(options, 'First parameter');\n    this._byteLengthQueuingStrategyHighWaterMark = options.highWaterMark;\n  }\n\n  /**\n   * Returns the high water mark provided to the constructor.\n   */\n  get highWaterMark(): number {\n    if (!IsByteLengthQueuingStrategy(this)) {\n      throw byteLengthBrandCheckException('highWaterMark');\n    }\n    return this._byteLengthQueuingStrategyHighWaterMark;\n  }\n\n  /**\n   * Measures the size of `chunk` by returning the value of its `byteLength` property.\n   */\n  get size(): (chunk: ArrayBufferView) => number {\n    if (!IsByteLengthQueuingStrategy(this)) {\n      throw byteLengthBrandCheckException('size');\n    }\n    return byteLengthSizeFunction;\n  }\n}\n\nObject.defineProperties(ByteLengthQueuingStrategy.prototype, {\n  highWaterMark: { enumerable: true },\n  size: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ByteLengthQueuingStrategy.prototype, Symbol.toStringTag, {\n    value: 'ByteLengthQueuingStrategy',\n    configurable: true\n  });\n}\n\n// Helper functions for the ByteLengthQueuingStrategy.\n\nfunction byteLengthBrandCheckException(name: string): TypeError {\n  return new TypeError(`ByteLengthQueuingStrategy.prototype.${name} can only be used on a ByteLengthQueuingStrategy`);\n}\n\nexport function IsByteLengthQueuingStrategy(x: any): x is ByteLengthQueuingStrategy {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_byteLengthQueuingStrategyHighWaterMark')) {\n    return false;\n  }\n\n  return x instanceof ByteLengthQueuingStrategy;\n}\n","import { QueuingStrategy, QueuingStrategyInit } from './queuing-strategy';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategyInit } from './validators/queuing-strategy-init';\n\n// The size function must not have a prototype property nor be a constructor\nconst countSizeFunction = (): 1 => {\n  return 1;\n};\ntry {\n  Object.defineProperty(countSizeFunction, 'name', {\n    value: 'size',\n    configurable: true\n  });\n} catch {\n  // This property is non-configurable in older browsers, so ignore if this throws.\n  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility\n}\n\n/**\n * A queuing strategy that counts the number of chunks.\n *\n * @public\n */\nexport default class CountQueuingStrategy implements QueuingStrategy<any> {\n  /** @internal */\n  readonly _countQueuingStrategyHighWaterMark!: number;\n\n  constructor(options: QueuingStrategyInit) {\n    assertRequiredArgument(options, 1, 'CountQueuingStrategy');\n    options = convertQueuingStrategyInit(options, 'First parameter');\n    this._countQueuingStrategyHighWaterMark = options.highWaterMark;\n  }\n\n  /**\n   * Returns the high water mark provided to the constructor.\n   */\n  get highWaterMark(): number {\n    if (!IsCountQueuingStrategy(this)) {\n      throw countBrandCheckException('highWaterMark');\n    }\n    return this._countQueuingStrategyHighWaterMark;\n  }\n\n  /**\n   * Measures the size of `chunk` by always returning 1.\n   * This ensures that the total queue size is a count of the number of chunks in the queue.\n   */\n  get size(): (chunk: any) => 1 {\n    if (!IsCountQueuingStrategy(this)) {\n      throw countBrandCheckException('size');\n    }\n    return countSizeFunction;\n  }\n}\n\nObject.defineProperties(CountQueuingStrategy.prototype, {\n  highWaterMark: { enumerable: true },\n  size: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(CountQueuingStrategy.prototype, Symbol.toStringTag, {\n    value: 'CountQueuingStrategy',\n    configurable: true\n  });\n}\n\n// Helper functions for the CountQueuingStrategy.\n\nfunction countBrandCheckException(name: string): TypeError {\n  return new TypeError(`CountQueuingStrategy.prototype.${name} can only be used on a CountQueuingStrategy`);\n}\n\nexport function IsCountQueuingStrategy(x: any): x is CountQueuingStrategy {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_countQueuingStrategyHighWaterMark')) {\n    return false;\n  }\n\n  return x instanceof CountQueuingStrategy;\n}\n","import { assertDictionary, assertFunction } from './basic';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\nimport {\n  Transformer,\n  TransformerFlushCallback,\n  TransformerStartCallback,\n  TransformerTransformCallback,\n  ValidatedTransformer\n} from '../transform-stream/transformer';\nimport { TransformStreamDefaultController } from '../transform-stream';\n\nexport function convertTransformer<I, O>(original: Transformer<I, O> | null,\n                                         context: string): ValidatedTransformer<I, O> {\n  assertDictionary(original, context);\n  const flush = original?.flush;\n  const readableType = original?.readableType;\n  const start = original?.start;\n  const transform = original?.transform;\n  const writableType = original?.writableType;\n  return {\n    flush: flush === undefined ?\n      undefined :\n      convertTransformerFlushCallback(flush, original!, `${context} has member 'flush' that`),\n    readableType,\n    start: start === undefined ?\n      undefined :\n      convertTransformerStartCallback(start, original!, `${context} has member 'start' that`),\n    transform: transform === undefined ?\n      undefined :\n      convertTransformerTransformCallback(transform, original!, `${context} has member 'transform' that`),\n    writableType\n  };\n}\n\nfunction convertTransformerFlushCallback<I, O>(\n  fn: TransformerFlushCallback<O>,\n  original: Transformer<I, O>,\n  context: string\n): (controller: TransformStreamDefaultController<O>) => Promise<void> {\n  assertFunction(fn, context);\n  return (controller: TransformStreamDefaultController<O>) => promiseCall(fn, original, [controller]);\n}\n\nfunction convertTransformerStartCallback<I, O>(\n  fn: TransformerStartCallback<O>,\n  original: Transformer<I, O>,\n  context: string\n): TransformerStartCallback<O> {\n  assertFunction(fn, context);\n  return (controller: TransformStreamDefaultController<O>) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertTransformerTransformCallback<I, O>(\n  fn: TransformerTransformCallback<I, O>,\n  original: Transformer<I, O>,\n  context: string\n): (chunk: I, controller: TransformStreamDefaultController<O>) => Promise<void> {\n  assertFunction(fn, context);\n  return (chunk: I, controller: TransformStreamDefaultController<O>) => promiseCall(fn, original, [chunk, controller]);\n}\n","import assert from '../stub/assert';\nimport { newPromise, promiseRejectedWith, promiseResolvedWith, transformPromiseWith } from './helpers/webidl';\nimport { CreateReadableStream, ReadableStream, ReadableStreamDefaultController } from './readable-stream';\nimport {\n  ReadableStreamDefaultControllerCanCloseOrEnqueue,\n  ReadableStreamDefaultControllerClose,\n  ReadableStreamDefaultControllerEnqueue,\n  ReadableStreamDefaultControllerError,\n  ReadableStreamDefaultControllerGetDesiredSize,\n  ReadableStreamDefaultControllerHasBackpressure\n} from './readable-stream/default-controller';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { CreateWritableStream, WritableStream, WritableStreamDefaultControllerErrorIfNeeded } from './writable-stream';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport {\n  Transformer,\n  TransformerFlushCallback,\n  TransformerStartCallback,\n  TransformerTransformCallback,\n  ValidatedTransformer\n} from './transform-stream/transformer';\nimport { convertTransformer } from './validators/transformer';\n\n// Class TransformStream\n\n/**\n * A transform stream consists of a pair of streams: a {@link WritableStream | writable stream},\n * known as its writable side, and a {@link ReadableStream | readable stream}, known as its readable side.\n * In a manner specific to the transform stream in question, writes to the writable side result in new data being\n * made available for reading from the readable side.\n *\n * @public\n */\nexport class TransformStream<I = any, O = any> {\n  /** @internal */\n  _writable!: WritableStream<I>;\n  /** @internal */\n  _readable!: ReadableStream<O>;\n  /** @internal */\n  _backpressure!: boolean;\n  /** @internal */\n  _backpressureChangePromise!: Promise<void>;\n  /** @internal */\n  _backpressureChangePromise_resolve!: () => void;\n  /** @internal */\n  _transformStreamController!: TransformStreamDefaultController<O>;\n\n  constructor(\n    transformer?: Transformer<I, O>,\n    writableStrategy?: QueuingStrategy<I>,\n    readableStrategy?: QueuingStrategy<O>\n  );\n  constructor(rawTransformer: Transformer<I, O> | null | undefined = {},\n              rawWritableStrategy: QueuingStrategy<I> | null | undefined = {},\n              rawReadableStrategy: QueuingStrategy<O> | null | undefined = {}) {\n    if (rawTransformer === undefined) {\n      rawTransformer = null;\n    }\n\n    const writableStrategy = convertQueuingStrategy(rawWritableStrategy, 'Second parameter');\n    const readableStrategy = convertQueuingStrategy(rawReadableStrategy, 'Third parameter');\n\n    const transformer = convertTransformer(rawTransformer, 'First parameter');\n    if (transformer.readableType !== undefined) {\n      throw new RangeError('Invalid readableType specified');\n    }\n    if (transformer.writableType !== undefined) {\n      throw new RangeError('Invalid writableType specified');\n    }\n\n    const readableHighWaterMark = ExtractHighWaterMark(readableStrategy, 0);\n    const readableSizeAlgorithm = ExtractSizeAlgorithm(readableStrategy);\n    const writableHighWaterMark = ExtractHighWaterMark(writableStrategy, 1);\n    const writableSizeAlgorithm = ExtractSizeAlgorithm(writableStrategy);\n\n    let startPromise_resolve!: (value: void | PromiseLike<void>) => void;\n    const startPromise = newPromise<void>(resolve => {\n      startPromise_resolve = resolve;\n    });\n\n    InitializeTransformStream(\n      this, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm\n    );\n    SetUpTransformStreamDefaultControllerFromTransformer(this, transformer);\n\n    if (transformer.start !== undefined) {\n      startPromise_resolve(transformer.start(this._transformStreamController));\n    } else {\n      startPromise_resolve(undefined);\n    }\n  }\n\n  /**\n   * The readable side of the transform stream.\n   */\n  get readable(): ReadableStream<O> {\n    if (!IsTransformStream(this)) {\n      throw streamBrandCheckException('readable');\n    }\n\n    return this._readable;\n  }\n\n  /**\n   * The writable side of the transform stream.\n   */\n  get writable(): WritableStream<I> {\n    if (!IsTransformStream(this)) {\n      throw streamBrandCheckException('writable');\n    }\n\n    return this._writable;\n  }\n}\n\nObject.defineProperties(TransformStream.prototype, {\n  readable: { enumerable: true },\n  writable: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(TransformStream.prototype, Symbol.toStringTag, {\n    value: 'TransformStream',\n    configurable: true\n  });\n}\n\nexport {\n  Transformer,\n  TransformerStartCallback,\n  TransformerFlushCallback,\n  TransformerTransformCallback\n};\n\n// Transform Stream Abstract Operations\n\nexport function CreateTransformStream<I, O>(startAlgorithm: () => void | PromiseLike<void>,\n                                            transformAlgorithm: (chunk: I) => Promise<void>,\n                                            flushAlgorithm: () => Promise<void>,\n                                            writableHighWaterMark = 1,\n                                            writableSizeAlgorithm: QueuingStrategySizeCallback<I> = () => 1,\n                                            readableHighWaterMark = 0,\n                                            readableSizeAlgorithm: QueuingStrategySizeCallback<O> = () => 1) {\n  assert(IsNonNegativeNumber(writableHighWaterMark));\n  assert(IsNonNegativeNumber(readableHighWaterMark));\n\n  const stream: TransformStream<I, O> = Object.create(TransformStream.prototype);\n\n  let startPromise_resolve!: (value: void | PromiseLike<void>) => void;\n  const startPromise = newPromise<void>(resolve => {\n    startPromise_resolve = resolve;\n  });\n\n  InitializeTransformStream(stream, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark,\n                            readableSizeAlgorithm);\n\n  const controller: TransformStreamDefaultController<O> = Object.create(TransformStreamDefaultController.prototype);\n\n  SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);\n\n  const startResult = startAlgorithm();\n  startPromise_resolve(startResult);\n  return stream;\n}\n\nfunction InitializeTransformStream<I, O>(stream: TransformStream<I, O>,\n                                         startPromise: Promise<void>,\n                                         writableHighWaterMark: number,\n                                         writableSizeAlgorithm: QueuingStrategySizeCallback<I>,\n                                         readableHighWaterMark: number,\n                                         readableSizeAlgorithm: QueuingStrategySizeCallback<O>) {\n  function startAlgorithm(): Promise<void> {\n    return startPromise;\n  }\n\n  function writeAlgorithm(chunk: I): Promise<void> {\n    return TransformStreamDefaultSinkWriteAlgorithm(stream, chunk);\n  }\n\n  function abortAlgorithm(reason: any): Promise<void> {\n    return TransformStreamDefaultSinkAbortAlgorithm(stream, reason);\n  }\n\n  function closeAlgorithm(): Promise<void> {\n    return TransformStreamDefaultSinkCloseAlgorithm(stream);\n  }\n\n  stream._writable = CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm,\n                                          writableHighWaterMark, writableSizeAlgorithm);\n\n  function pullAlgorithm(): Promise<void> {\n    return TransformStreamDefaultSourcePullAlgorithm(stream);\n  }\n\n  function cancelAlgorithm(reason: any): Promise<void> {\n    TransformStreamErrorWritableAndUnblockWrite(stream, reason);\n    return promiseResolvedWith(undefined);\n  }\n\n  stream._readable = CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, readableHighWaterMark,\n                                          readableSizeAlgorithm);\n\n  // The [[backpressure]] slot is set to undefined so that it can be initialised by TransformStreamSetBackpressure.\n  stream._backpressure = undefined!;\n  stream._backpressureChangePromise = undefined!;\n  stream._backpressureChangePromise_resolve = undefined!;\n  TransformStreamSetBackpressure(stream, true);\n\n  stream._transformStreamController = undefined!;\n}\n\nfunction IsTransformStream(x: unknown): x is TransformStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_transformStreamController')) {\n    return false;\n  }\n\n  return x instanceof TransformStream;\n}\n\n// This is a no-op if both sides are already errored.\nfunction TransformStreamError(stream: TransformStream, e: any) {\n  ReadableStreamDefaultControllerError(\n    stream._readable._readableStreamController as ReadableStreamDefaultController<any>,\n    e\n  );\n  TransformStreamErrorWritableAndUnblockWrite(stream, e);\n}\n\nfunction TransformStreamErrorWritableAndUnblockWrite(stream: TransformStream, e: any) {\n  TransformStreamDefaultControllerClearAlgorithms(stream._transformStreamController);\n  WritableStreamDefaultControllerErrorIfNeeded(stream._writable._writableStreamController, e);\n  if (stream._backpressure) {\n    // Pretend that pull() was called to permit any pending write() calls to complete. TransformStreamSetBackpressure()\n    // cannot be called from enqueue() or pull() once the ReadableStream is errored, so this will will be the final time\n    // _backpressure is set.\n    TransformStreamSetBackpressure(stream, false);\n  }\n}\n\nfunction TransformStreamSetBackpressure(stream: TransformStream, backpressure: boolean) {\n  // Passes also when called during construction.\n  assert(stream._backpressure !== backpressure);\n\n  if (stream._backpressureChangePromise !== undefined) {\n    stream._backpressureChangePromise_resolve();\n  }\n\n  stream._backpressureChangePromise = newPromise(resolve => {\n    stream._backpressureChangePromise_resolve = resolve;\n  });\n\n  stream._backpressure = backpressure;\n}\n\n// Class TransformStreamDefaultController\n\n/**\n * Allows control of the {@link ReadableStream} and {@link WritableStream} of the associated {@link TransformStream}.\n *\n * @public\n */\nexport class TransformStreamDefaultController<O> {\n  /** @internal */\n  _controlledTransformStream: TransformStream<any, O>;\n  /** @internal */\n  _transformAlgorithm: (chunk: any) => Promise<void>;\n  /** @internal */\n  _flushAlgorithm: () => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the desired size to fill the readable side’s internal queue. It can be negative, if the queue is over-full.\n   */\n  get desiredSize(): number | null {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('desiredSize');\n    }\n\n    const readableController = this._controlledTransformStream._readable._readableStreamController;\n    return ReadableStreamDefaultControllerGetDesiredSize(readableController as ReadableStreamDefaultController<O>);\n  }\n\n  /**\n   * Enqueues the given chunk `chunk` in the readable side of the controlled transform stream.\n   */\n  enqueue(chunk: O): void;\n  enqueue(chunk: O = undefined!): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('enqueue');\n    }\n\n    TransformStreamDefaultControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors both the readable side and the writable side of the controlled transform stream, making all future\n   * interactions with it fail with the given error `e`. Any chunks queued for transformation will be discarded.\n   */\n  error(reason: any = undefined): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n\n    TransformStreamDefaultControllerError(this, reason);\n  }\n\n  /**\n   * Closes the readable side and errors the writable side of the controlled transform stream. This is useful when the\n   * transformer only needs to consume a portion of the chunks written to the writable side.\n   */\n  terminate(): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('terminate');\n    }\n\n    TransformStreamDefaultControllerTerminate(this);\n  }\n}\n\nObject.defineProperties(TransformStreamDefaultController.prototype, {\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  terminate: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(TransformStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'TransformStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Transform Stream Default Controller Abstract Operations\n\nfunction IsTransformStreamDefaultController<O = any>(x: any): x is TransformStreamDefaultController<O> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledTransformStream')) {\n    return false;\n  }\n\n  return x instanceof TransformStreamDefaultController;\n}\n\nfunction SetUpTransformStreamDefaultController<I, O>(stream: TransformStream<I, O>,\n                                                     controller: TransformStreamDefaultController<O>,\n                                                     transformAlgorithm: (chunk: I) => Promise<void>,\n                                                     flushAlgorithm: () => Promise<void>) {\n  assert(IsTransformStream(stream));\n  assert(stream._transformStreamController === undefined);\n\n  controller._controlledTransformStream = stream;\n  stream._transformStreamController = controller;\n\n  controller._transformAlgorithm = transformAlgorithm;\n  controller._flushAlgorithm = flushAlgorithm;\n}\n\nfunction SetUpTransformStreamDefaultControllerFromTransformer<I, O>(stream: TransformStream<I, O>,\n                                     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TransformStreamDefaultController<any>) {\n  controller._transformAlgorithm = undefined!;\n  controller._flushAlgorithm = undefined!;\n}\n\nfunction TransformStreamDefaultControllerEnqueue<O>(controller: TransformStreamDefaultController<O>, chunk: O) {\n  const stream = controller._controlledTransformStream;\n  const readableController = stream._readable._readableStreamController as ReadableStreamDefaultController<O>;\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(readableController)) {\n    throw new TypeError('Readable side is not in a state that permits enqueue');\n  }\n\n  // We throttle transform invocations based on the backpressure of the ReadableStream, but we still\n  // accept TransformStreamDefaultControllerEnqueue() calls.\n\n  try {\n    ReadableStreamDefaultControllerEnqueue(readableController, chunk);\n  } catch (e) {\n    // This happens when readableStrategy.size() throws.\n    TransformStreamErrorWritableAndUnblockWrite(stream, e);\n\n    throw stream._readable._storedError;\n  }\n\n  const backpressure = ReadableStreamDefaultControllerHasBackpressure(readableController);\n  if (backpressure !== stream._backpressure) {\n    assert(backpressure);\n    TransformStreamSetBackpressure(stream, true);\n  }\n}\n\nfunction TransformStreamDefaultControllerError(controller: TransformStreamDefaultController<any>, e: any) {\n  TransformStreamError(controller._controlledTransformStream, e);\n}\n\nfunction TransformStreamDefaultControllerPerformTransform<I, O>(controller: TransformStreamDefaultController<O>,\n                                                                chunk: I) {\n  const transformPromise = controller._transformAlgorithm(chunk);\n  return transformPromiseWith(transformPromise, undefined, r => {\n    TransformStreamError(controller._controlledTransformStream, r);\n    throw r;\n  });\n}\n\nfunction TransformStreamDefaultControllerTerminate<O>(controller: TransformStreamDefaultController<O>) {\n  const stream = controller._controlledTransformStream;\n  const readableController = stream._readable._readableStreamController as ReadableStreamDefaultController<O>;\n\n  ReadableStreamDefaultControllerClose(readableController);\n\n  const error = new TypeError('TransformStream terminated');\n  TransformStreamErrorWritableAndUnblockWrite(stream, error);\n}\n\n// TransformStreamDefaultSink Algorithms\n\nfunction TransformStreamDefaultSinkWriteAlgorithm<I, O>(stream: TransformStream<I, O>, chunk: I): Promise<void> {\n  assert(stream._writable._state === 'writable');\n\n  const controller = stream._transformStreamController;\n\n  if (stream._backpressure) {\n    const backpressureChangePromise = stream._backpressureChangePromise;\n    assert(backpressureChangePromise !== undefined);\n    return transformPromiseWith(backpressureChangePromise, () => {\n      const writable = stream._writable;\n      const state = writable._state;\n      if (state === 'erroring') {\n        throw writable._storedError;\n   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\ No newline at end of file
diff --git a/node_modules/web-streams-polyfill/dist/ponyfill.es6.mjs b/node_modules/web-streams-polyfill/dist/ponyfill.es6.mjs
new file mode 100644
index 0000000..84a6a3a
--- /dev/null
+++ b/node_modules/web-streams-polyfill/dist/ponyfill.es6.mjs
@@ -0,0 +1,4202 @@
+/**
+ * web-streams-polyfill v3.2.1
+ */
+/// <reference lib="es2015.symbol" />
+const SymbolPolyfill = typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol' ?
+    Symbol :
+    description => `Symbol(${description})`;
+
+/// <reference lib="dom" />
+function noop() {
+    return undefined;
+}
+function getGlobals() {
+    if (typeof self !== 'undefined') {
+        return self;
+    }
+    else if (typeof window !== 'undefined') {
+        return window;
+    }
+    else if (typeof global !== 'undefined') {
+        return global;
+    }
+    return undefined;
+}
+const globals = getGlobals();
+
+function typeIsObject(x) {
+    return (typeof x === 'object' && x !== null) || typeof x === 'function';
+}
+const rethrowAssertionErrorRejection = noop;
+
+const originalPromise = Promise;
+const originalPromiseThen = Promise.prototype.then;
+const originalPromiseResolve = Promise.resolve.bind(originalPromise);
+const originalPromiseReject = Promise.reject.bind(originalPromise);
+function newPromise(executor) {
+    return new originalPromise(executor);
+}
+function promiseResolvedWith(value) {
+    return originalPromiseResolve(value);
+}
+function promiseRejectedWith(reason) {
+    return originalPromiseReject(reason);
+}
+function PerformPromiseThen(promise, onFulfilled, onRejected) {
+    // There doesn't appear to be any way to correctly emulate the behaviour from JavaScript, so this is just an
+    // approximation.
+    return originalPromiseThen.call(promise, onFulfilled, onRejected);
+}
+function uponPromise(promise, onFulfilled, onRejected) {
+    PerformPromiseThen(PerformPromiseThen(promise, onFulfilled, onRejected), undefined, rethrowAssertionErrorRejection);
+}
+function uponFulfillment(promise, onFulfilled) {
+    uponPromise(promise, onFulfilled);
+}
+function uponRejection(promise, onRejected) {
+    uponPromise(promise, undefined, onRejected);
+}
+function transformPromiseWith(promise, fulfillmentHandler, rejectionHandler) {
+    return PerformPromiseThen(promise, fulfillmentHandler, rejectionHandler);
+}
+function setPromiseIsHandledToTrue(promise) {
+    PerformPromiseThen(promise, undefined, rethrowAssertionErrorRejection);
+}
+const queueMicrotask = (() => {
+    const globalQueueMicrotask = globals && globals.queueMicrotask;
+    if (typeof globalQueueMicrotask === 'function') {
+        return globalQueueMicrotask;
+    }
+    const resolvedPromise = promiseResolvedWith(undefined);
+    return (fn) => PerformPromiseThen(resolvedPromise, fn);
+})();
+function reflectCall(F, V, args) {
+    if (typeof F !== 'function') {
+        throw new TypeError('Argument is not a function');
+    }
+    return Function.prototype.apply.call(F, V, args);
+}
+function promiseCall(F, V, args) {
+    try {
+        return promiseResolvedWith(reflectCall(F, V, args));
+    }
+    catch (value) {
+        return promiseRejectedWith(value);
+    }
+}
+
+// Original from Chromium
+// https://chromium.googlesource.com/chromium/src/+/0aee4434a4dba42a42abaea9bfbc0cd196a63bc1/third_party/blink/renderer/core/streams/SimpleQueue.js
+const QUEUE_MAX_ARRAY_SIZE = 16384;
+/**
+ * Simple queue structure.
+ *
+ * Avoids scalability issues with using a packed array directly by using
+ * multiple arrays in a linked list and keeping the array size bounded.
+ */
+class SimpleQueue {
+    constructor() {
+        this._cursor = 0;
+        this._size = 0;
+        // _front and _back are always defined.
+        this._front = {
+            _elements: [],
+            _next: undefined
+        };
+        this._back = this._front;
+        // The cursor is used to avoid calling Array.shift().
+        // It contains the index of the front element of the array inside the
+        // front-most node. It is always in the range [0, QUEUE_MAX_ARRAY_SIZE).
+        this._cursor = 0;
+        // When there is only one node, size === elements.length - cursor.
+        this._size = 0;
+    }
+    get length() {
+        return this._size;
+    }
+    // For exception safety, this method is structured in order:
+    // 1. Read state
+    // 2. Calculate required state mutations
+    // 3. Perform state mutations
+    push(element) {
+        const oldBack = this._back;
+        let newBack = oldBack;
+        if (oldBack._elements.length === QUEUE_MAX_ARRAY_SIZE - 1) {
+            newBack = {
+                _elements: [],
+                _next: undefined
+            };
+        }
+        // push() is the mutation most likely to throw an exception, so it
+        // goes first.
+        oldBack._elements.push(element);
+        if (newBack !== oldBack) {
+            this._back = newBack;
+            oldBack._next = newBack;
+        }
+        ++this._size;
+    }
+    // Like push(), shift() follows the read -> calculate -> mutate pattern for
+    // exception safety.
+    shift() { // must not be called on an empty queue
+        const oldFront = this._front;
+        let newFront = oldFront;
+        const oldCursor = this._cursor;
+        let newCursor = oldCursor + 1;
+        const elements = oldFront._elements;
+        const element = elements[oldCursor];
+        if (newCursor === QUEUE_MAX_ARRAY_SIZE) {
+            newFront = oldFront._next;
+            newCursor = 0;
+        }
+        // No mutations before this point.
+        --this._size;
+        this._cursor = newCursor;
+        if (oldFront !== newFront) {
+            this._front = newFront;
+        }
+        // Permit shifted element to be garbage collected.
+        elements[oldCursor] = undefined;
+        return element;
+    }
+    // The tricky thing about forEach() is that it can be called
+    // re-entrantly. The queue may be mutated inside the callback. It is easy to
+    // see that push() within the callback has no negative effects since the end
+    // of the queue is checked for on every iteration. If shift() is called
+    // repeatedly within the callback then the next iteration may return an
+    // element that has been removed. In this case the callback will be called
+    // with undefined values until we either "catch up" with elements that still
+    // exist or reach the back of the queue.
+    forEach(callback) {
+        let i = this._cursor;
+        let node = this._front;
+        let elements = node._elements;
+        while (i !== elements.length || node._next !== undefined) {
+            if (i === elements.length) {
+                node = node._next;
+                elements = node._elements;
+                i = 0;
+                if (elements.length === 0) {
+                    break;
+                }
+            }
+            callback(elements[i]);
+            ++i;
+        }
+    }
+    // Return the element that would be returned if shift() was called now,
+    // without modifying the queue.
+    peek() { // must not be called on an empty queue
+        const front = this._front;
+        const cursor = this._cursor;
+        return front._elements[cursor];
+    }
+}
+
+function ReadableStreamReaderGenericInitialize(reader, stream) {
+    reader._ownerReadableStream = stream;
+    stream._reader = reader;
+    if (stream._state === 'readable') {
+        defaultReaderClosedPromiseInitialize(reader);
+    }
+    else if (stream._state === 'closed') {
+        defaultReaderClosedPromiseInitializeAsResolved(reader);
+    }
+    else {
+        defaultReaderClosedPromiseInitializeAsRejected(reader, stream._storedError);
+    }
+}
+// A client of ReadableStreamDefaultReader and ReadableStreamBYOBReader may use these functions directly to bypass state
+// check.
+function ReadableStreamReaderGenericCancel(reader, reason) {
+    const stream = reader._ownerReadableStream;
+    return ReadableStreamCancel(stream, reason);
+}
+function ReadableStreamReaderGenericRelease(reader) {
+    if (reader._ownerReadableStream._state === 'readable') {
+        defaultReaderClosedPromiseReject(reader, new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));
+    }
+    else {
+        defaultReaderClosedPromiseResetToRejected(reader, new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));
+    }
+    reader._ownerReadableStream._reader = undefined;
+    reader._ownerReadableStream = undefined;
+}
+// Helper functions for the readers.
+function readerLockException(name) {
+    return new TypeError('Cannot ' + name + ' a stream using a released reader');
+}
+// Helper functions for the ReadableStreamDefaultReader.
+function defaultReaderClosedPromiseInitialize(reader) {
+    reader._closedPromise = newPromise((resolve, reject) => {
+        reader._closedPromise_resolve = resolve;
+        reader._closedPromise_reject = reject;
+    });
+}
+function defaultReaderClosedPromiseInitializeAsRejected(reader, reason) {
+    defaultReaderClosedPromiseInitialize(reader);
+    defaultReaderClosedPromiseReject(reader, reason);
+}
+function defaultReaderClosedPromiseInitializeAsResolved(reader) {
+    defaultReaderClosedPromiseInitialize(reader);
+    defaultReaderClosedPromiseResolve(reader);
+}
+function defaultReaderClosedPromiseReject(reader, reason) {
+    if (reader._closedPromise_reject === undefined) {
+        return;
+    }
+    setPromiseIsHandledToTrue(reader._closedPromise);
+    reader._closedPromise_reject(reason);
+    reader._closedPromise_resolve = undefined;
+    reader._closedPromise_reject = undefined;
+}
+function defaultReaderClosedPromiseResetToRejected(reader, reason) {
+    defaultReaderClosedPromiseInitializeAsRejected(reader, reason);
+}
+function defaultReaderClosedPromiseResolve(reader) {
+    if (reader._closedPromise_resolve === undefined) {
+        return;
+    }
+    reader._closedPromise_resolve(undefined);
+    reader._closedPromise_resolve = undefined;
+    reader._closedPromise_reject = undefined;
+}
+
+const AbortSteps = SymbolPolyfill('[[AbortSteps]]');
+const ErrorSteps = SymbolPolyfill('[[ErrorSteps]]');
+const CancelSteps = SymbolPolyfill('[[CancelSteps]]');
+const PullSteps = SymbolPolyfill('[[PullSteps]]');
+
+/// <reference lib="es2015.core" />
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite#Polyfill
+const NumberIsFinite = Number.isFinite || function (x) {
+    return typeof x === 'number' && isFinite(x);
+};
+
+/// <reference lib="es2015.core" />
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc#Polyfill
+const MathTrunc = Math.trunc || function (v) {
+    return v < 0 ? Math.ceil(v) : Math.floor(v);
+};
+
+// https://heycam.github.io/webidl/#idl-dictionaries
+function isDictionary(x) {
+    return typeof x === 'object' || typeof x === 'function';
+}
+function assertDictionary(obj, context) {
+    if (obj !== undefined && !isDictionary(obj)) {
+        throw new TypeError(`${context} is not an object.`);
+    }
+}
+// https://heycam.github.io/webidl/#idl-callback-functions
+function assertFunction(x, context) {
+    if (typeof x !== 'function') {
+        throw new TypeError(`${context} is not a function.`);
+    }
+}
+// https://heycam.github.io/webidl/#idl-object
+function isObject(x) {
+    return (typeof x === 'object' && x !== null) || typeof x === 'function';
+}
+function assertObject(x, context) {
+    if (!isObject(x)) {
+        throw new TypeError(`${context} is not an object.`);
+    }
+}
+function assertRequiredArgument(x, position, context) {
+    if (x === undefined) {
+        throw new TypeError(`Parameter ${position} is required in '${context}'.`);
+    }
+}
+function assertRequiredField(x, field, context) {
+    if (x === undefined) {
+        throw new TypeError(`${field} is required in '${context}'.`);
+    }
+}
+// https://heycam.github.io/webidl/#idl-unrestricted-double
+function convertUnrestrictedDouble(value) {
+    return Number(value);
+}
+function censorNegativeZero(x) {
+    return x === 0 ? 0 : x;
+}
+function integerPart(x) {
+    return censorNegativeZero(MathTrunc(x));
+}
+// https://heycam.github.io/webidl/#idl-unsigned-long-long
+function convertUnsignedLongLongWithEnforceRange(value, context) {
+    const lowerBound = 0;
+    const upperBound = Number.MAX_SAFE_INTEGER;
+    let x = Number(value);
+    x = censorNegativeZero(x);
+    if (!NumberIsFinite(x)) {
+        throw new TypeError(`${context} is not a finite number`);
+    }
+    x = integerPart(x);
+    if (x < lowerBound || x > upperBound) {
+        throw new TypeError(`${context} is outside the accepted range of ${lowerBound} to ${upperBound}, inclusive`);
+    }
+    if (!NumberIsFinite(x) || x === 0) {
+        return 0;
+    }
+    // TODO Use BigInt if supported?
+    // let xBigInt = BigInt(integerPart(x));
+    // xBigInt = BigInt.asUintN(64, xBigInt);
+    // return Number(xBigInt);
+    return x;
+}
+
+function assertReadableStream(x, context) {
+    if (!IsReadableStream(x)) {
+        throw new TypeError(`${context} is not a ReadableStream.`);
+    }
+}
+
+// Abstract operations for the ReadableStream.
+function AcquireReadableStreamDefaultReader(stream) {
+    return new ReadableStreamDefaultReader(stream);
+}
+// ReadableStream API exposed for controllers.
+function ReadableStreamAddReadRequest(stream, readRequest) {
+    stream._reader._readRequests.push(readRequest);
+}
+function ReadableStreamFulfillReadRequest(stream, chunk, done) {
+    const reader = stream._reader;
+    const readRequest = reader._readRequests.shift();
+    if (done) {
+        readRequest._closeSteps();
+    }
+    else {
+        readRequest._chunkSteps(chunk);
+    }
+}
+function ReadableStreamGetNumReadRequests(stream) {
+    return stream._reader._readRequests.length;
+}
+function ReadableStreamHasDefaultReader(stream) {
+    const reader = stream._reader;
+    if (reader === undefined) {
+        return false;
+    }
+    if (!IsReadableStreamDefaultReader(reader)) {
+        return false;
+    }
+    return true;
+}
+/**
+ * A default reader vended by a {@link ReadableStream}.
+ *
+ * @public
+ */
+class ReadableStreamDefaultReader {
+    constructor(stream) {
+        assertRequiredArgument(stream, 1, 'ReadableStreamDefaultReader');
+        assertReadableStream(stream, 'First parameter');
+        if (IsReadableStreamLocked(stream)) {
+            throw new TypeError('This stream has already been locked for exclusive reading by another reader');
+        }
+        ReadableStreamReaderGenericInitialize(this, stream);
+        this._readRequests = new SimpleQueue();
+    }
+    /**
+     * Returns a promise that will be fulfilled when the stream becomes closed,
+     * or rejected if the stream ever errors or the reader's lock is released before the stream finishes closing.
+     */
+    get closed() {
+        if (!IsReadableStreamDefaultReader(this)) {
+            return promiseRejectedWith(defaultReaderBrandCheckException('closed'));
+        }
+        return this._closedPromise;
+    }
+    /**
+     * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.
+     */
+    cancel(reason = undefined) {
+        if (!IsReadableStreamDefaultReader(this)) {
+            return promiseRejectedWith(defaultReaderBrandCheckException('cancel'));
+        }
+        if (this._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('cancel'));
+        }
+        return ReadableStreamReaderGenericCancel(this, reason);
+    }
+    /**
+     * Returns a promise that allows access to the next chunk from the stream's internal queue, if available.
+     *
+     * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.
+     */
+    read() {
+        if (!IsReadableStreamDefaultReader(this)) {
+            return promiseRejectedWith(defaultReaderBrandCheckException('read'));
+        }
+        if (this._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('read from'));
+        }
+        let resolvePromise;
+        let rejectPromise;
+        const promise = newPromise((resolve, reject) => {
+            resolvePromise = resolve;
+            rejectPromise = reject;
+        });
+        const readRequest = {
+            _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),
+            _closeSteps: () => resolvePromise({ value: undefined, done: true }),
+            _errorSteps: e => rejectPromise(e)
+        };
+        ReadableStreamDefaultReaderRead(this, readRequest);
+        return promise;
+    }
+    /**
+     * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.
+     * If the associated stream is errored when the lock is released, the reader will appear errored in the same way
+     * from now on; otherwise, the reader will appear closed.
+     *
+     * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by
+     * the reader's {@link ReadableStreamDefaultReader.read | read()} method has not yet been settled. Attempting to
+     * do so will throw a `TypeError` and leave the reader locked to the stream.
+     */
+    releaseLock() {
+        if (!IsReadableStreamDefaultReader(this)) {
+            throw defaultReaderBrandCheckException('releaseLock');
+        }
+        if (this._ownerReadableStream === undefined) {
+            return;
+        }
+        if (this._readRequests.length > 0) {
+            throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');
+        }
+        ReadableStreamReaderGenericRelease(this);
+    }
+}
+Object.defineProperties(ReadableStreamDefaultReader.prototype, {
+    cancel: { enumerable: true },
+    read: { enumerable: true },
+    releaseLock: { enumerable: true },
+    closed: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableStreamDefaultReader.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableStreamDefaultReader',
+        configurable: true
+    });
+}
+// Abstract operations for the readers.
+function IsReadableStreamDefaultReader(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_readRequests')) {
+        return false;
+    }
+    return x instanceof ReadableStreamDefaultReader;
+}
+function ReadableStreamDefaultReaderRead(reader, readRequest) {
+    const stream = reader._ownerReadableStream;
+    stream._disturbed = true;
+    if (stream._state === 'closed') {
+        readRequest._closeSteps();
+    }
+    else if (stream._state === 'errored') {
+        readRequest._errorSteps(stream._storedError);
+    }
+    else {
+        stream._readableStreamController[PullSteps](readRequest);
+    }
+}
+// Helper functions for the ReadableStreamDefaultReader.
+function defaultReaderBrandCheckException(name) {
+    return new TypeError(`ReadableStreamDefaultReader.prototype.${name} can only be used on a ReadableStreamDefaultReader`);
+}
+
+/// <reference lib="es2018.asynciterable" />
+let AsyncIteratorPrototype;
+if (typeof SymbolPolyfill.asyncIterator === 'symbol') {
+    // We're running inside a ES2018+ environment, but we're compiling to an older syntax.
+    // We cannot access %AsyncIteratorPrototype% without non-ES2018 syntax, but we can re-create it.
+    AsyncIteratorPrototype = {
+        // 25.1.3.1 %AsyncIteratorPrototype% [ @@asyncIterator ] ( )
+        // https://tc39.github.io/ecma262/#sec-asynciteratorprototype-asynciterator
+        [SymbolPolyfill.asyncIterator]() {
+            return this;
+        }
+    };
+    Object.defineProperty(AsyncIteratorPrototype, SymbolPolyfill.asyncIterator, { enumerable: false });
+}
+
+/// <reference lib="es2018.asynciterable" />
+class ReadableStreamAsyncIteratorImpl {
+    constructor(reader, preventCancel) {
+        this._ongoingPromise = undefined;
+        this._isFinished = false;
+        this._reader = reader;
+        this._preventCancel = preventCancel;
+    }
+    next() {
+        const nextSteps = () => this._nextSteps();
+        this._ongoingPromise = this._ongoingPromise ?
+            transformPromiseWith(this._ongoingPromise, nextSteps, nextSteps) :
+            nextSteps();
+        return this._ongoingPromise;
+    }
+    return(value) {
+        const returnSteps = () => this._returnSteps(value);
+        return this._ongoingPromise ?
+            transformPromiseWith(this._ongoingPromise, returnSteps, returnSteps) :
+            returnSteps();
+    }
+    _nextSteps() {
+        if (this._isFinished) {
+            return Promise.resolve({ value: undefined, done: true });
+        }
+        const reader = this._reader;
+        if (reader._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('iterate'));
+        }
+        let resolvePromise;
+        let rejectPromise;
+        const promise = newPromise((resolve, reject) => {
+            resolvePromise = resolve;
+            rejectPromise = reject;
+        });
+        const readRequest = {
+            _chunkSteps: chunk => {
+                this._ongoingPromise = undefined;
+                // This needs to be delayed by one microtask, otherwise we stop pulling too early which breaks a test.
+                // FIXME Is this a bug in the specification, or in the test?
+                queueMicrotask(() => resolvePromise({ value: chunk, done: false }));
+            },
+            _closeSteps: () => {
+                this._ongoingPromise = undefined;
+                this._isFinished = true;
+                ReadableStreamReaderGenericRelease(reader);
+                resolvePromise({ value: undefined, done: true });
+            },
+            _errorSteps: reason => {
+                this._ongoingPromise = undefined;
+                this._isFinished = true;
+                ReadableStreamReaderGenericRelease(reader);
+                rejectPromise(reason);
+            }
+        };
+        ReadableStreamDefaultReaderRead(reader, readRequest);
+        return promise;
+    }
+    _returnSteps(value) {
+        if (this._isFinished) {
+            return Promise.resolve({ value, done: true });
+        }
+        this._isFinished = true;
+        const reader = this._reader;
+        if (reader._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('finish iterating'));
+        }
+        if (!this._preventCancel) {
+            const result = ReadableStreamReaderGenericCancel(reader, value);
+            ReadableStreamReaderGenericRelease(reader);
+            return transformPromiseWith(result, () => ({ value, done: true }));
+        }
+        ReadableStreamReaderGenericRelease(reader);
+        return promiseResolvedWith({ value, done: true });
+    }
+}
+const ReadableStreamAsyncIteratorPrototype = {
+    next() {
+        if (!IsReadableStreamAsyncIterator(this)) {
+            return promiseRejectedWith(streamAsyncIteratorBrandCheckException('next'));
+        }
+        return this._asyncIteratorImpl.next();
+    },
+    return(value) {
+        if (!IsReadableStreamAsyncIterator(this)) {
+            return promiseRejectedWith(streamAsyncIteratorBrandCheckException('return'));
+        }
+        return this._asyncIteratorImpl.return(value);
+    }
+};
+if (AsyncIteratorPrototype !== undefined) {
+    Object.setPrototypeOf(ReadableStreamAsyncIteratorPrototype, AsyncIteratorPrototype);
+}
+// Abstract operations for the ReadableStream.
+function AcquireReadableStreamAsyncIterator(stream, preventCancel) {
+    const reader = AcquireReadableStreamDefaultReader(stream);
+    const impl = new ReadableStreamAsyncIteratorImpl(reader, preventCancel);
+    const iterator = Object.create(ReadableStreamAsyncIteratorPrototype);
+    iterator._asyncIteratorImpl = impl;
+    return iterator;
+}
+function IsReadableStreamAsyncIterator(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_asyncIteratorImpl')) {
+        return false;
+    }
+    try {
+        // noinspection SuspiciousTypeOfGuard
+        return x._asyncIteratorImpl instanceof
+            ReadableStreamAsyncIteratorImpl;
+    }
+    catch (_a) {
+        return false;
+    }
+}
+// Helper functions for the ReadableStream.
+function streamAsyncIteratorBrandCheckException(name) {
+    return new TypeError(`ReadableStreamAsyncIterator.${name} can only be used on a ReadableSteamAsyncIterator`);
+}
+
+/// <reference lib="es2015.core" />
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Polyfill
+const NumberIsNaN = Number.isNaN || function (x) {
+    // eslint-disable-next-line no-self-compare
+    return x !== x;
+};
+
+function CreateArrayFromList(elements) {
+    // We use arrays to represent lists, so this is basically a no-op.
+    // Do a slice though just in case we happen to depend on the unique-ness.
+    return elements.slice();
+}
+function CopyDataBlockBytes(dest, destOffset, src, srcOffset, n) {
+    new Uint8Array(dest).set(new Uint8Array(src, srcOffset, n), destOffset);
+}
+// Not implemented correctly
+function TransferArrayBuffer(O) {
+    return O;
+}
+// Not implemented correctly
+// eslint-disable-next-line @typescript-eslint/no-unused-vars
+function IsDetachedBuffer(O) {
+    return false;
+}
+function ArrayBufferSlice(buffer, begin, end) {
+    // ArrayBuffer.prototype.slice is not available on IE10
+    // https://www.caniuse.com/mdn-javascript_builtins_arraybuffer_slice
+    if (buffer.slice) {
+        return buffer.slice(begin, end);
+    }
+    const length = end - begin;
+    const slice = new ArrayBuffer(length);
+    CopyDataBlockBytes(slice, 0, buffer, begin, length);
+    return slice;
+}
+
+function IsNonNegativeNumber(v) {
+    if (typeof v !== 'number') {
+        return false;
+    }
+    if (NumberIsNaN(v)) {
+        return false;
+    }
+    if (v < 0) {
+        return false;
+    }
+    return true;
+}
+function CloneAsUint8Array(O) {
+    const buffer = ArrayBufferSlice(O.buffer, O.byteOffset, O.byteOffset + O.byteLength);
+    return new Uint8Array(buffer);
+}
+
+function DequeueValue(container) {
+    const pair = container._queue.shift();
+    container._queueTotalSize -= pair.size;
+    if (container._queueTotalSize < 0) {
+        container._queueTotalSize = 0;
+    }
+    return pair.value;
+}
+function EnqueueValueWithSize(container, value, size) {
+    if (!IsNonNegativeNumber(size) || size === Infinity) {
+        throw new RangeError('Size must be a finite, non-NaN, non-negative number.');
+    }
+    container._queue.push({ value, size });
+    container._queueTotalSize += size;
+}
+function PeekQueueValue(container) {
+    const pair = container._queue.peek();
+    return pair.value;
+}
+function ResetQueue(container) {
+    container._queue = new SimpleQueue();
+    container._queueTotalSize = 0;
+}
+
+/**
+ * A pull-into request in a {@link ReadableByteStreamController}.
+ *
+ * @public
+ */
+class ReadableStreamBYOBRequest {
+    constructor() {
+        throw new TypeError('Illegal constructor');
+    }
+    /**
+     * Returns the view for writing in to, or `null` if the BYOB request has already been responded to.
+     */
+    get view() {
+        if (!IsReadableStreamBYOBRequest(this)) {
+            throw byobRequestBrandCheckException('view');
+        }
+        return this._view;
+    }
+    respond(bytesWritten) {
+        if (!IsReadableStreamBYOBRequest(this)) {
+            throw byobRequestBrandCheckException('respond');
+        }
+        assertRequiredArgument(bytesWritten, 1, 'respond');
+        bytesWritten = convertUnsignedLongLongWithEnforceRange(bytesWritten, 'First parameter');
+        if (this._associatedReadableByteStreamController === undefined) {
+            throw new TypeError('This BYOB request has been invalidated');
+        }
+        if (IsDetachedBuffer(this._view.buffer)) ;
+        ReadableByteStreamControllerRespond(this._associatedReadableByteStreamController, bytesWritten);
+    }
+    respondWithNewView(view) {
+        if (!IsReadableStreamBYOBRequest(this)) {
+            throw byobRequestBrandCheckException('respondWithNewView');
+        }
+        assertRequiredArgument(view, 1, 'respondWithNewView');
+        if (!ArrayBuffer.isView(view)) {
+            throw new TypeError('You can only respond with array buffer views');
+        }
+        if (this._associatedReadableByteStreamController === undefined) {
+            throw new TypeError('This BYOB request has been invalidated');
+        }
+        if (IsDetachedBuffer(view.buffer)) ;
+        ReadableByteStreamControllerRespondWithNewView(this._associatedReadableByteStreamController, view);
+    }
+}
+Object.defineProperties(ReadableStreamBYOBRequest.prototype, {
+    respond: { enumerable: true },
+    respondWithNewView: { enumerable: true },
+    view: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableStreamBYOBRequest.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableStreamBYOBRequest',
+        configurable: true
+    });
+}
+/**
+ * Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue.
+ *
+ * @public
+ */
+class ReadableByteStreamController {
+    constructor() {
+        throw new TypeError('Illegal constructor');
+    }
+    /**
+     * Returns the current BYOB pull request, or `null` if there isn't one.
+     */
+    get byobRequest() {
+        if (!IsReadableByteStreamController(this)) {
+            throw byteStreamControllerBrandCheckException('byobRequest');
+        }
+        return ReadableByteStreamControllerGetBYOBRequest(this);
+    }
+    /**
+     * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is
+     * over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure.
+     */
+    get desiredSize() {
+        if (!IsReadableByteStreamController(this)) {
+            throw byteStreamControllerBrandCheckException('desiredSize');
+        }
+        return ReadableByteStreamControllerGetDesiredSize(this);
+    }
+    /**
+     * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from
+     * the stream, but once those are read, the stream will become closed.
+     */
+    close() {
+        if (!IsReadableByteStreamController(this)) {
+            throw byteStreamControllerBrandCheckException('close');
+        }
+        if (this._closeRequested) {
+            throw new TypeError('The stream has already been closed; do not close it again!');
+        }
+        const state = this._controlledReadableByteStream._state;
+        if (state !== 'readable') {
+            throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be closed`);
+        }
+        ReadableByteStreamControllerClose(this);
+    }
+    enqueue(chunk) {
+        if (!IsReadableByteStreamController(this)) {
+            throw byteStreamControllerBrandCheckException('enqueue');
+        }
+        assertRequiredArgument(chunk, 1, 'enqueue');
+        if (!ArrayBuffer.isView(chunk)) {
+            throw new TypeError('chunk must be an array buffer view');
+        }
+        if (chunk.byteLength === 0) {
+            throw new TypeError('chunk must have non-zero byteLength');
+        }
+        if (chunk.buffer.byteLength === 0) {
+            throw new TypeError(`chunk's buffer must have non-zero byteLength`);
+        }
+        if (this._closeRequested) {
+            throw new TypeError('stream is closed or draining');
+        }
+        const state = this._controlledReadableByteStream._state;
+        if (state !== 'readable') {
+            throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be enqueued to`);
+        }
+        ReadableByteStreamControllerEnqueue(this, chunk);
+    }
+    /**
+     * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.
+     */
+    error(e = undefined) {
+        if (!IsReadableByteStreamController(this)) {
+            throw byteStreamControllerBrandCheckException('error');
+        }
+        ReadableByteStreamControllerError(this, e);
+    }
+    /** @internal */
+    [CancelSteps](reason) {
+        ReadableByteStreamControllerClearPendingPullIntos(this);
+        ResetQueue(this);
+        const result = this._cancelAlgorithm(reason);
+        ReadableByteStreamControllerClearAlgorithms(this);
+        return result;
+    }
+    /** @internal */
+    [PullSteps](readRequest) {
+        const stream = this._controlledReadableByteStream;
+        if (this._queueTotalSize > 0) {
+            const entry = this._queue.shift();
+            this._queueTotalSize -= entry.byteLength;
+            ReadableByteStreamControllerHandleQueueDrain(this);
+            const view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);
+            readRequest._chunkSteps(view);
+            return;
+        }
+        const autoAllocateChunkSize = this._autoAllocateChunkSize;
+        if (autoAllocateChunkSize !== undefined) {
+            let buffer;
+            try {
+                buffer = new ArrayBuffer(autoAllocateChunkSize);
+            }
+            catch (bufferE) {
+                readRequest._errorSteps(bufferE);
+                return;
+            }
+            const pullIntoDescriptor = {
+                buffer,
+                bufferByteLength: autoAllocateChunkSize,
+                byteOffset: 0,
+                byteLength: autoAllocateChunkSize,
+                bytesFilled: 0,
+                elementSize: 1,
+                viewConstructor: Uint8Array,
+                readerType: 'default'
+            };
+            this._pendingPullIntos.push(pullIntoDescriptor);
+        }
+        ReadableStreamAddReadRequest(stream, readRequest);
+        ReadableByteStreamControllerCallPullIfNeeded(this);
+    }
+}
+Object.defineProperties(ReadableByteStreamController.prototype, {
+    close: { enumerable: true },
+    enqueue: { enumerable: true },
+    error: { enumerable: true },
+    byobRequest: { enumerable: true },
+    desiredSize: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableByteStreamController.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableByteStreamController',
+        configurable: true
+    });
+}
+// Abstract operations for the ReadableByteStreamController.
+function IsReadableByteStreamController(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableByteStream')) {
+        return false;
+    }
+    return x instanceof ReadableByteStreamController;
+}
+function IsReadableStreamBYOBRequest(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_associatedReadableByteStreamController')) {
+        return false;
+    }
+    return x instanceof ReadableStreamBYOBRequest;
+}
+function ReadableByteStreamControllerCallPullIfNeeded(controller) {
+    const shouldPull = ReadableByteStreamControllerShouldCallPull(controller);
+    if (!shouldPull) {
+        return;
+    }
+    if (controller._pulling) {
+        controller._pullAgain = true;
+        return;
+    }
+    controller._pulling = true;
+    // TODO: Test controller argument
+    const pullPromise = controller._pullAlgorithm();
+    uponPromise(pullPromise, () => {
+        controller._pulling = false;
+        if (controller._pullAgain) {
+            controller._pullAgain = false;
+            ReadableByteStreamControllerCallPullIfNeeded(controller);
+        }
+    }, e => {
+        ReadableByteStreamControllerError(controller, e);
+    });
+}
+function ReadableByteStreamControllerClearPendingPullIntos(controller) {
+    ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+    controller._pendingPullIntos = new SimpleQueue();
+}
+function ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor) {
+    let done = false;
+    if (stream._state === 'closed') {
+        done = true;
+    }
+    const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor);
+    if (pullIntoDescriptor.readerType === 'default') {
+        ReadableStreamFulfillReadRequest(stream, filledView, done);
+    }
+    else {
+        ReadableStreamFulfillReadIntoRequest(stream, filledView, done);
+    }
+}
+function ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor) {
+    const bytesFilled = pullIntoDescriptor.bytesFilled;
+    const elementSize = pullIntoDescriptor.elementSize;
+    return new pullIntoDescriptor.viewConstructor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize);
+}
+function ReadableByteStreamControllerEnqueueChunkToQueue(controller, buffer, byteOffset, byteLength) {
+    controller._queue.push({ buffer, byteOffset, byteLength });
+    controller._queueTotalSize += byteLength;
+}
+function ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor) {
+    const elementSize = pullIntoDescriptor.elementSize;
+    const currentAlignedBytes = pullIntoDescriptor.bytesFilled - pullIntoDescriptor.bytesFilled % elementSize;
+    const maxBytesToCopy = Math.min(controller._queueTotalSize, pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled);
+    const maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;
+    const maxAlignedBytes = maxBytesFilled - maxBytesFilled % elementSize;
+    let totalBytesToCopyRemaining = maxBytesToCopy;
+    let ready = false;
+    if (maxAlignedBytes > currentAlignedBytes) {
+        totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled;
+        ready = true;
+    }
+    const queue = controller._queue;
+    while (totalBytesToCopyRemaining > 0) {
+        const headOfQueue = queue.peek();
+        const bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength);
+        const destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;
+        CopyDataBlockBytes(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy);
+        if (headOfQueue.byteLength === bytesToCopy) {
+            queue.shift();
+        }
+        else {
+            headOfQueue.byteOffset += bytesToCopy;
+            headOfQueue.byteLength -= bytesToCopy;
+        }
+        controller._queueTotalSize -= bytesToCopy;
+        ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor);
+        totalBytesToCopyRemaining -= bytesToCopy;
+    }
+    return ready;
+}
+function ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, size, pullIntoDescriptor) {
+    pullIntoDescriptor.bytesFilled += size;
+}
+function ReadableByteStreamControllerHandleQueueDrain(controller) {
+    if (controller._queueTotalSize === 0 && controller._closeRequested) {
+        ReadableByteStreamControllerClearAlgorithms(controller);
+        ReadableStreamClose(controller._controlledReadableByteStream);
+    }
+    else {
+        ReadableByteStreamControllerCallPullIfNeeded(controller);
+    }
+}
+function ReadableByteStreamControllerInvalidateBYOBRequest(controller) {
+    if (controller._byobRequest === null) {
+        return;
+    }
+    controller._byobRequest._associatedReadableByteStreamController = undefined;
+    controller._byobRequest._view = null;
+    controller._byobRequest = null;
+}
+function ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller) {
+    while (controller._pendingPullIntos.length > 0) {
+        if (controller._queueTotalSize === 0) {
+            return;
+        }
+        const pullIntoDescriptor = controller._pendingPullIntos.peek();
+        if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {
+            ReadableByteStreamControllerShiftPendingPullInto(controller);
+            ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);
+        }
+    }
+}
+function ReadableByteStreamControllerPullInto(controller, view, readIntoRequest) {
+    const stream = controller._controlledReadableByteStream;
+    let elementSize = 1;
+    if (view.constructor !== DataView) {
+        elementSize = view.constructor.BYTES_PER_ELEMENT;
+    }
+    const ctor = view.constructor;
+    // try {
+    const buffer = TransferArrayBuffer(view.buffer);
+    // } catch (e) {
+    //   readIntoRequest._errorSteps(e);
+    //   return;
+    // }
+    const pullIntoDescriptor = {
+        buffer,
+        bufferByteLength: buffer.byteLength,
+        byteOffset: view.byteOffset,
+        byteLength: view.byteLength,
+        bytesFilled: 0,
+        elementSize,
+        viewConstructor: ctor,
+        readerType: 'byob'
+    };
+    if (controller._pendingPullIntos.length > 0) {
+        controller._pendingPullIntos.push(pullIntoDescriptor);
+        // No ReadableByteStreamControllerCallPullIfNeeded() call since:
+        // - No change happens on desiredSize
+        // - The source has already been notified of that there's at least 1 pending read(view)
+        ReadableStreamAddReadIntoRequest(stream, readIntoRequest);
+        return;
+    }
+    if (stream._state === 'closed') {
+        const emptyView = new ctor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0);
+        readIntoRequest._closeSteps(emptyView);
+        return;
+    }
+    if (controller._queueTotalSize > 0) {
+        if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {
+            const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor);
+            ReadableByteStreamControllerHandleQueueDrain(controller);
+            readIntoRequest._chunkSteps(filledView);
+            return;
+        }
+        if (controller._closeRequested) {
+            const e = new TypeError('Insufficient bytes to fill elements in the given buffer');
+            ReadableByteStreamControllerError(controller, e);
+            readIntoRequest._errorSteps(e);
+            return;
+        }
+    }
+    controller._pendingPullIntos.push(pullIntoDescriptor);
+    ReadableStreamAddReadIntoRequest(stream, readIntoRequest);
+    ReadableByteStreamControllerCallPullIfNeeded(controller);
+}
+function ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor) {
+    const stream = controller._controlledReadableByteStream;
+    if (ReadableStreamHasBYOBReader(stream)) {
+        while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {
+            const pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);
+            ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);
+        }
+    }
+}
+function ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, pullIntoDescriptor) {
+    ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor);
+    if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {
+        return;
+    }
+    ReadableByteStreamControllerShiftPendingPullInto(controller);
+    const remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize;
+    if (remainderSize > 0) {
+        const end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;
+        const remainder = ArrayBufferSlice(pullIntoDescriptor.buffer, end - remainderSize, end);
+        ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength);
+    }
+    pullIntoDescriptor.bytesFilled -= remainderSize;
+    ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);
+    ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);
+}
+function ReadableByteStreamControllerRespondInternal(controller, bytesWritten) {
+    const firstDescriptor = controller._pendingPullIntos.peek();
+    ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+    const state = controller._controlledReadableByteStream._state;
+    if (state === 'closed') {
+        ReadableByteStreamControllerRespondInClosedState(controller);
+    }
+    else {
+        ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);
+    }
+    ReadableByteStreamControllerCallPullIfNeeded(controller);
+}
+function ReadableByteStreamControllerShiftPendingPullInto(controller) {
+    const descriptor = controller._pendingPullIntos.shift();
+    return descriptor;
+}
+function ReadableByteStreamControllerShouldCallPull(controller) {
+    const stream = controller._controlledReadableByteStream;
+    if (stream._state !== 'readable') {
+        return false;
+    }
+    if (controller._closeRequested) {
+        return false;
+    }
+    if (!controller._started) {
+        return false;
+    }
+    if (ReadableStreamHasDefaultReader(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+        return true;
+    }
+    if (ReadableStreamHasBYOBReader(stream) && ReadableStreamGetNumReadIntoRequests(stream) > 0) {
+        return true;
+    }
+    const desiredSize = ReadableByteStreamControllerGetDesiredSize(controller);
+    if (desiredSize > 0) {
+        return true;
+    }
+    return false;
+}
+function ReadableByteStreamControllerClearAlgorithms(controller) {
+    controller._pullAlgorithm = undefined;
+    controller._cancelAlgorithm = undefined;
+}
+// A client of ReadableByteStreamController may use these functions directly to bypass state check.
+function ReadableByteStreamControllerClose(controller) {
+    const stream = controller._controlledReadableByteStream;
+    if (controller._closeRequested || stream._state !== 'readable') {
+        return;
+    }
+    if (controller._queueTotalSize > 0) {
+        controller._closeRequested = true;
+        return;
+    }
+    if (controller._pendingPullIntos.length > 0) {
+        const firstPendingPullInto = controller._pendingPullIntos.peek();
+        if (firstPendingPullInto.bytesFilled > 0) {
+            const e = new TypeError('Insufficient bytes to fill elements in the given buffer');
+            ReadableByteStreamControllerError(controller, e);
+            throw e;
+        }
+    }
+    ReadableByteStreamControllerClearAlgorithms(controller);
+    ReadableStreamClose(stream);
+}
+function ReadableByteStreamControllerEnqueue(controller, chunk) {
+    const stream = controller._controlledReadableByteStream;
+    if (controller._closeRequested || stream._state !== 'readable') {
+        return;
+    }
+    const buffer = chunk.buffer;
+    const byteOffset = chunk.byteOffset;
+    const byteLength = chunk.byteLength;
+    const transferredBuffer = TransferArrayBuffer(buffer);
+    if (controller._pendingPullIntos.length > 0) {
+        const firstPendingPullInto = controller._pendingPullIntos.peek();
+        if (IsDetachedBuffer(firstPendingPullInto.buffer)) ;
+        firstPendingPullInto.buffer = TransferArrayBuffer(firstPendingPullInto.buffer);
+    }
+    ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+    if (ReadableStreamHasDefaultReader(stream)) {
+        if (ReadableStreamGetNumReadRequests(stream) === 0) {
+            ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+        }
+        else {
+            if (controller._pendingPullIntos.length > 0) {
+                ReadableByteStreamControllerShiftPendingPullInto(controller);
+            }
+            const transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength);
+            ReadableStreamFulfillReadRequest(stream, transferredView, false);
+        }
+    }
+    else if (ReadableStreamHasBYOBReader(stream)) {
+        // TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully.
+        ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+        ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);
+    }
+    else {
+        ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+    }
+    ReadableByteStreamControllerCallPullIfNeeded(controller);
+}
+function ReadableByteStreamControllerError(controller, e) {
+    const stream = controller._controlledReadableByteStream;
+    if (stream._state !== 'readable') {
+        return;
+    }
+    ReadableByteStreamControllerClearPendingPullIntos(controller);
+    ResetQueue(controller);
+    ReadableByteStreamControllerClearAlgorithms(controller);
+    ReadableStreamError(stream, e);
+}
+function ReadableByteStreamControllerGetBYOBRequest(controller) {
+    if (controller._byobRequest === null && controller._pendingPullIntos.length > 0) {
+        const firstDescriptor = controller._pendingPullIntos.peek();
+        const view = new Uint8Array(firstDescriptor.buffer, firstDescriptor.byteOffset + firstDescriptor.bytesFilled, firstDescriptor.byteLength - firstDescriptor.bytesFilled);
+        const byobRequest = Object.create(ReadableStreamBYOBRequest.prototype);
+        SetUpReadableStreamBYOBRequest(byobRequest, controller, view);
+        controller._byobRequest = byobRequest;
+    }
+    return controller._byobRequest;
+}
+function ReadableByteStreamControllerGetDesiredSize(controller) {
+    const state = controller._controlledReadableByteStream._state;
+    if (state === 'errored') {
+        return null;
+    }
+    if (state === 'closed') {
+        return 0;
+    }
+    return controller._strategyHWM - controller._queueTotalSize;
+}
+function ReadableByteStreamControllerRespond(controller, bytesWritten) {
+    const firstDescriptor = controller._pendingPullIntos.peek();
+    const state = controller._controlledReadableByteStream._state;
+    if (state === 'closed') {
+        if (bytesWritten !== 0) {
+            throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream');
+        }
+    }
+    else {
+        if (bytesWritten === 0) {
+            throw new TypeError('bytesWritten must be greater than 0 when calling respond() on a readable stream');
+        }
+        if (firstDescriptor.bytesFilled + bytesWritten > firstDescriptor.byteLength) {
+            throw new RangeError('bytesWritten out of range');
+        }
+    }
+    firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer);
+    ReadableByteStreamControllerRespondInternal(controller, bytesWritten);
+}
+function ReadableByteStreamControllerRespondWithNewView(controller, view) {
+    const firstDescriptor = controller._pendingPullIntos.peek();
+    const state = controller._controlledReadableByteStream._state;
+    if (state === 'closed') {
+        if (view.byteLength !== 0) {
+            throw new TypeError('The view\'s length must be 0 when calling respondWithNewView() on a closed stream');
+        }
+    }
+    else {
+        if (view.byteLength === 0) {
+            throw new TypeError('The view\'s length must be greater than 0 when calling respondWithNewView() on a readable stream');
+        }
+    }
+    if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) {
+        throw new RangeError('The region specified by view does not match byobRequest');
+    }
+    if (firstDescriptor.bufferByteLength !== view.buffer.byteLength) {
+        throw new RangeError('The buffer of view has different capacity than byobRequest');
+    }
+    if (firstDescriptor.bytesFilled + view.byteLength > firstDescriptor.byteLength) {
+        throw new RangeError('The region specified by view is larger than byobRequest');
+    }
+    const viewByteLength = view.byteLength;
+    firstDescriptor.buffer = TransferArrayBuffer(view.buffer);
+    ReadableByteStreamControllerRespondInternal(controller, viewByteLength);
+}
+function SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize) {
+    controller._controlledReadableByteStream = stream;
+    controller._pullAgain = false;
+    controller._pulling = false;
+    controller._byobRequest = null;
+    // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.
+    controller._queue = controller._queueTotalSize = undefined;
+    ResetQueue(controller);
+    controller._closeRequested = false;
+    controller._started = false;
+    controller._strategyHWM = highWaterMark;
+    controller._pullAlgorithm = pullAlgorithm;
+    controller._cancelAlgorithm = cancelAlgorithm;
+    controller._autoAllocateChunkSize = autoAllocateChunkSize;
+    controller._pendingPullIntos = new SimpleQueue();
+    stream._readableStreamController = controller;
+    const startResult = startAlgorithm();
+    uponPromise(promiseResolvedWith(startResult), () => {
+        controller._started = true;
+        ReadableByteStreamControllerCallPullIfNeeded(controller);
+    }, r => {
+        ReadableByteStreamControllerError(controller, r);
+    });
+}
+function SetUpReadableByteStreamControllerFromUnderlyingSource(stream, underlyingByteSource, highWaterMark) {
+    const controller = Object.create(ReadableByteStreamController.prototype);
+    let startAlgorithm = () => undefined;
+    let pullAlgorithm = () => promiseResolvedWith(undefined);
+    let cancelAlgorithm = () => promiseResolvedWith(undefined);
+    if (underlyingByteSource.start !== undefined) {
+        startAlgorithm = () => underlyingByteSource.start(controller);
+    }
+    if (underlyingByteSource.pull !== undefined) {
+        pullAlgorithm = () => underlyingByteSource.pull(controller);
+    }
+    if (underlyingByteSource.cancel !== undefined) {
+        cancelAlgorithm = reason => underlyingByteSource.cancel(reason);
+    }
+    const autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;
+    if (autoAllocateChunkSize === 0) {
+        throw new TypeError('autoAllocateChunkSize must be greater than 0');
+    }
+    SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize);
+}
+function SetUpReadableStreamBYOBRequest(request, controller, view) {
+    request._associatedReadableByteStreamController = controller;
+    request._view = view;
+}
+// Helper functions for the ReadableStreamBYOBRequest.
+function byobRequestBrandCheckException(name) {
+    return new TypeError(`ReadableStreamBYOBRequest.prototype.${name} can only be used on a ReadableStreamBYOBRequest`);
+}
+// Helper functions for the ReadableByteStreamController.
+function byteStreamControllerBrandCheckException(name) {
+    return new TypeError(`ReadableByteStreamController.prototype.${name} can only be used on a ReadableByteStreamController`);
+}
+
+// Abstract operations for the ReadableStream.
+function AcquireReadableStreamBYOBReader(stream) {
+    return new ReadableStreamBYOBReader(stream);
+}
+// ReadableStream API exposed for controllers.
+function ReadableStreamAddReadIntoRequest(stream, readIntoRequest) {
+    stream._reader._readIntoRequests.push(readIntoRequest);
+}
+function ReadableStreamFulfillReadIntoRequest(stream, chunk, done) {
+    const reader = stream._reader;
+    const readIntoRequest = reader._readIntoRequests.shift();
+    if (done) {
+        readIntoRequest._closeSteps(chunk);
+    }
+    else {
+        readIntoRequest._chunkSteps(chunk);
+    }
+}
+function ReadableStreamGetNumReadIntoRequests(stream) {
+    return stream._reader._readIntoRequests.length;
+}
+function ReadableStreamHasBYOBReader(stream) {
+    const reader = stream._reader;
+    if (reader === undefined) {
+        return false;
+    }
+    if (!IsReadableStreamBYOBReader(reader)) {
+        return false;
+    }
+    return true;
+}
+/**
+ * A BYOB reader vended by a {@link ReadableStream}.
+ *
+ * @public
+ */
+class ReadableStreamBYOBReader {
+    constructor(stream) {
+        assertRequiredArgument(stream, 1, 'ReadableStreamBYOBReader');
+        assertReadableStream(stream, 'First parameter');
+        if (IsReadableStreamLocked(stream)) {
+            throw new TypeError('This stream has already been locked for exclusive reading by another reader');
+        }
+        if (!IsReadableByteStreamController(stream._readableStreamController)) {
+            throw new TypeError('Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte ' +
+                'source');
+        }
+        ReadableStreamReaderGenericInitialize(this, stream);
+        this._readIntoRequests = new SimpleQueue();
+    }
+    /**
+     * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or
+     * the reader's lock is released before the stream finishes closing.
+     */
+    get closed() {
+        if (!IsReadableStreamBYOBReader(this)) {
+            return promiseRejectedWith(byobReaderBrandCheckException('closed'));
+        }
+        return this._closedPromise;
+    }
+    /**
+     * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.
+     */
+    cancel(reason = undefined) {
+        if (!IsReadableStreamBYOBReader(this)) {
+            return promiseRejectedWith(byobReaderBrandCheckException('cancel'));
+        }
+        if (this._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('cancel'));
+        }
+        return ReadableStreamReaderGenericCancel(this, reason);
+    }
+    /**
+     * Attempts to reads bytes into view, and returns a promise resolved with the result.
+     *
+     * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.
+     */
+    read(view) {
+        if (!IsReadableStreamBYOBReader(this)) {
+            return promiseRejectedWith(byobReaderBrandCheckException('read'));
+        }
+        if (!ArrayBuffer.isView(view)) {
+            return promiseRejectedWith(new TypeError('view must be an array buffer view'));
+        }
+        if (view.byteLength === 0) {
+            return promiseRejectedWith(new TypeError('view must have non-zero byteLength'));
+        }
+        if (view.buffer.byteLength === 0) {
+            return promiseRejectedWith(new TypeError(`view's buffer must have non-zero byteLength`));
+        }
+        if (IsDetachedBuffer(view.buffer)) ;
+        if (this._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('read from'));
+        }
+        let resolvePromise;
+        let rejectPromise;
+        const promise = newPromise((resolve, reject) => {
+            resolvePromise = resolve;
+            rejectPromise = reject;
+        });
+        const readIntoRequest = {
+            _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),
+            _closeSteps: chunk => resolvePromise({ value: chunk, done: true }),
+            _errorSteps: e => rejectPromise(e)
+        };
+        ReadableStreamBYOBReaderRead(this, view, readIntoRequest);
+        return promise;
+    }
+    /**
+     * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.
+     * If the associated stream is errored when the lock is released, the reader will appear errored in the same way
+     * from now on; otherwise, the reader will appear closed.
+     *
+     * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by
+     * the reader's {@link ReadableStreamBYOBReader.read | read()} method has not yet been settled. Attempting to
+     * do so will throw a `TypeError` and leave the reader locked to the stream.
+     */
+    releaseLock() {
+        if (!IsReadableStreamBYOBReader(this)) {
+            throw byobReaderBrandCheckException('releaseLock');
+        }
+        if (this._ownerReadableStream === undefined) {
+            return;
+        }
+        if (this._readIntoRequests.length > 0) {
+            throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');
+        }
+        ReadableStreamReaderGenericRelease(this);
+    }
+}
+Object.defineProperties(ReadableStreamBYOBReader.prototype, {
+    cancel: { enumerable: true },
+    read: { enumerable: true },
+    releaseLock: { enumerable: true },
+    closed: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableStreamBYOBReader.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableStreamBYOBReader',
+        configurable: true
+    });
+}
+// Abstract operations for the readers.
+function IsReadableStreamBYOBReader(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_readIntoRequests')) {
+        return false;
+    }
+    return x instanceof ReadableStreamBYOBReader;
+}
+function ReadableStreamBYOBReaderRead(reader, view, readIntoRequest) {
+    const stream = reader._ownerReadableStream;
+    stream._disturbed = true;
+    if (stream._state === 'errored') {
+        readIntoRequest._errorSteps(stream._storedError);
+    }
+    else {
+        ReadableByteStreamControllerPullInto(stream._readableStreamController, view, readIntoRequest);
+    }
+}
+// Helper functions for the ReadableStreamBYOBReader.
+function byobReaderBrandCheckException(name) {
+    return new TypeError(`ReadableStreamBYOBReader.prototype.${name} can only be used on a ReadableStreamBYOBReader`);
+}
+
+function ExtractHighWaterMark(strategy, defaultHWM) {
+    const { highWaterMark } = strategy;
+    if (highWaterMark === undefined) {
+        return defaultHWM;
+    }
+    if (NumberIsNaN(highWaterMark) || highWaterMark < 0) {
+        throw new RangeError('Invalid highWaterMark');
+    }
+    return highWaterMark;
+}
+function ExtractSizeAlgorithm(strategy) {
+    const { size } = strategy;
+    if (!size) {
+        return () => 1;
+    }
+    return size;
+}
+
+function convertQueuingStrategy(init, context) {
+    assertDictionary(init, context);
+    const highWaterMark = init === null || init === void 0 ? void 0 : init.highWaterMark;
+    const size = init === null || init === void 0 ? void 0 : init.size;
+    return {
+        highWaterMark: highWaterMark === undefined ? undefined : convertUnrestrictedDouble(highWaterMark),
+        size: size === undefined ? undefined : convertQueuingStrategySize(size, `${context} has member 'size' that`)
+    };
+}
+function convertQueuingStrategySize(fn, context) {
+    assertFunction(fn, context);
+    return chunk => convertUnrestrictedDouble(fn(chunk));
+}
+
+function convertUnderlyingSink(original, context) {
+    assertDictionary(original, context);
+    const abort = original === null || original === void 0 ? void 0 : original.abort;
+    const close = original === null || original === void 0 ? void 0 : original.close;
+    const start = original === null || original === void 0 ? void 0 : original.start;
+    const type = original === null || original === void 0 ? void 0 : original.type;
+    const write = original === null || original === void 0 ? void 0 : original.write;
+    return {
+        abort: abort === undefined ?
+            undefined :
+            convertUnderlyingSinkAbortCallback(abort, original, `${context} has member 'abort' that`),
+        close: close === undefined ?
+            undefined :
+            convertUnderlyingSinkCloseCallback(close, original, `${context} has member 'close' that`),
+        start: start === undefined ?
+            undefined :
+            convertUnderlyingSinkStartCallback(start, original, `${context} has member 'start' that`),
+        write: write === undefined ?
+            undefined :
+            convertUnderlyingSinkWriteCallback(write, original, `${context} has member 'write' that`),
+        type
+    };
+}
+function convertUnderlyingSinkAbortCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (reason) => promiseCall(fn, original, [reason]);
+}
+function convertUnderlyingSinkCloseCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return () => promiseCall(fn, original, []);
+}
+function convertUnderlyingSinkStartCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (controller) => reflectCall(fn, original, [controller]);
+}
+function convertUnderlyingSinkWriteCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (chunk, controller) => promiseCall(fn, original, [chunk, controller]);
+}
+
+function assertWritableStream(x, context) {
+    if (!IsWritableStream(x)) {
+        throw new TypeError(`${context} is not a WritableStream.`);
+    }
+}
+
+function isAbortSignal(value) {
+    if (typeof value !== 'object' || value === null) {
+        return false;
+    }
+    try {
+        return typeof value.aborted === 'boolean';
+    }
+    catch (_a) {
+        // AbortSignal.prototype.aborted throws if its brand check fails
+        return false;
+    }
+}
+const supportsAbortController = typeof AbortController === 'function';
+/**
+ * Construct a new AbortController, if supported by the platform.
+ *
+ * @internal
+ */
+function createAbortController() {
+    if (supportsAbortController) {
+        return new AbortController();
+    }
+    return undefined;
+}
+
+/**
+ * A writable stream represents a destination for data, into which you can write.
+ *
+ * @public
+ */
+class WritableStream {
+    constructor(rawUnderlyingSink = {}, rawStrategy = {}) {
+        if (rawUnderlyingSink === undefined) {
+            rawUnderlyingSink = null;
+        }
+        else {
+            assertObject(rawUnderlyingSink, 'First parameter');
+        }
+        const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');
+        const underlyingSink = convertUnderlyingSink(rawUnderlyingSink, 'First parameter');
+        InitializeWritableStream(this);
+        const type = underlyingSink.type;
+        if (type !== undefined) {
+            throw new RangeError('Invalid type is specified');
+        }
+        const sizeAlgorithm = ExtractSizeAlgorithm(strategy);
+        const highWaterMark = ExtractHighWaterMark(strategy, 1);
+        SetUpWritableStreamDefaultControllerFromUnderlyingSink(this, underlyingSink, highWaterMark, sizeAlgorithm);
+    }
+    /**
+     * Returns whether or not the writable stream is locked to a writer.
+     */
+    get locked() {
+        if (!IsWritableStream(this)) {
+            throw streamBrandCheckException$2('locked');
+        }
+        return IsWritableStreamLocked(this);
+    }
+    /**
+     * Aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be
+     * immediately moved to an errored state, with any queued-up writes discarded. This will also execute any abort
+     * mechanism of the underlying sink.
+     *
+     * The returned promise will fulfill if the stream shuts down successfully, or reject if the underlying sink signaled
+     * that there was an error doing so. Additionally, it will reject with a `TypeError` (without attempting to cancel
+     * the stream) if the stream is currently locked.
+     */
+    abort(reason = undefined) {
+        if (!IsWritableStream(this)) {
+            return promiseRejectedWith(streamBrandCheckException$2('abort'));
+        }
+        if (IsWritableStreamLocked(this)) {
+            return promiseRejectedWith(new TypeError('Cannot abort a stream that already has a writer'));
+        }
+        return WritableStreamAbort(this, reason);
+    }
+    /**
+     * Closes the stream. The underlying sink will finish processing any previously-written chunks, before invoking its
+     * close behavior. During this time any further attempts to write will fail (without erroring the stream).
+     *
+     * The method returns a promise that will fulfill if all remaining chunks are successfully written and the stream
+     * successfully closes, or rejects if an error is encountered during this process. Additionally, it will reject with
+     * a `TypeError` (without attempting to cancel the stream) if the stream is currently locked.
+     */
+    close() {
+        if (!IsWritableStream(this)) {
+            return promiseRejectedWith(streamBrandCheckException$2('close'));
+        }
+        if (IsWritableStreamLocked(this)) {
+            return promiseRejectedWith(new TypeError('Cannot close a stream that already has a writer'));
+        }
+        if (WritableStreamCloseQueuedOrInFlight(this)) {
+            return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));
+        }
+        return WritableStreamClose(this);
+    }
+    /**
+     * Creates a {@link WritableStreamDefaultWriter | writer} and locks the stream to the new writer. While the stream
+     * is locked, no other writer can be acquired until this one is released.
+     *
+     * This functionality is especially useful for creating abstractions that desire the ability to write to a stream
+     * without interruption or interleaving. By getting a writer for the stream, you can ensure nobody else can write at
+     * the same time, which would cause the resulting written data to be unpredictable and probably useless.
+     */
+    getWriter() {
+        if (!IsWritableStream(this)) {
+            throw streamBrandCheckException$2('getWriter');
+        }
+        return AcquireWritableStreamDefaultWriter(this);
+    }
+}
+Object.defineProperties(WritableStream.prototype, {
+    abort: { enumerable: true },
+    close: { enumerable: true },
+    getWriter: { enumerable: true },
+    locked: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(WritableStream.prototype, SymbolPolyfill.toStringTag, {
+        value: 'WritableStream',
+        configurable: true
+    });
+}
+// Abstract operations for the WritableStream.
+function AcquireWritableStreamDefaultWriter(stream) {
+    return new WritableStreamDefaultWriter(stream);
+}
+// Throws if and only if startAlgorithm throws.
+function CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark = 1, sizeAlgorithm = () => 1) {
+    const stream = Object.create(WritableStream.prototype);
+    InitializeWritableStream(stream);
+    const controller = Object.create(WritableStreamDefaultController.prototype);
+    SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm);
+    return stream;
+}
+function InitializeWritableStream(stream) {
+    stream._state = 'writable';
+    // The error that will be reported by new method calls once the state becomes errored. Only set when [[state]] is
+    // 'erroring' or 'errored'. May be set to an undefined value.
+    stream._storedError = undefined;
+    stream._writer = undefined;
+    // Initialize to undefined first because the constructor of the controller checks this
+    // variable to validate the caller.
+    stream._writableStreamController = undefined;
+    // This queue is placed here instead of the writer class in order to allow for passing a writer to the next data
+    // producer without waiting for the queued writes to finish.
+    stream._writeRequests = new SimpleQueue();
+    // Write requests are removed from _writeRequests when write() is called on the underlying sink. This prevents
+    // them from being erroneously rejected on error. If a write() call is in-flight, the request is stored here.
+    stream._inFlightWriteRequest = undefined;
+    // The promise that was returned from writer.close(). Stored here because it may be fulfilled after the writer
+    // has been detached.
+    stream._closeRequest = undefined;
+    // Close request is removed from _closeRequest when close() is called on the underlying sink. This prevents it
+    // from being erroneously rejected on error. If a close() call is in-flight, the request is stored here.
+    stream._inFlightCloseRequest = undefined;
+    // The promise that was returned from writer.abort(). This may also be fulfilled after the writer has detached.
+    stream._pendingAbortRequest = undefined;
+    // The backpressure signal set by the controller.
+    stream._backpressure = false;
+}
+function IsWritableStream(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_writableStreamController')) {
+        return false;
+    }
+    return x instanceof WritableStream;
+}
+function IsWritableStreamLocked(stream) {
+    if (stream._writer === undefined) {
+        return false;
+    }
+    return true;
+}
+function WritableStreamAbort(stream, reason) {
+    var _a;
+    if (stream._state === 'closed' || stream._state === 'errored') {
+        return promiseResolvedWith(undefined);
+    }
+    stream._writableStreamController._abortReason = reason;
+    (_a = stream._writableStreamController._abortController) === null || _a === void 0 ? void 0 : _a.abort();
+    // TypeScript narrows the type of `stream._state` down to 'writable' | 'erroring',
+    // but it doesn't know that signaling abort runs author code that might have changed the state.
+    // Widen the type again by casting to WritableStreamState.
+    const state = stream._state;
+    if (state === 'closed' || state === 'errored') {
+        return promiseResolvedWith(undefined);
+    }
+    if (stream._pendingAbortRequest !== undefined) {
+        return stream._pendingAbortRequest._promise;
+    }
+    let wasAlreadyErroring = false;
+    if (state === 'erroring') {
+        wasAlreadyErroring = true;
+        // reason will not be used, so don't keep a reference to it.
+        reason = undefined;
+    }
+    const promise = newPromise((resolve, reject) => {
+        stream._pendingAbortRequest = {
+            _promise: undefined,
+            _resolve: resolve,
+            _reject: reject,
+            _reason: reason,
+            _wasAlreadyErroring: wasAlreadyErroring
+        };
+    });
+    stream._pendingAbortRequest._promise = promise;
+    if (!wasAlreadyErroring) {
+        WritableStreamStartErroring(stream, reason);
+    }
+    return promise;
+}
+function WritableStreamClose(stream) {
+    const state = stream._state;
+    if (state === 'closed' || state === 'errored') {
+        return promiseRejectedWith(new TypeError(`The stream (in ${state} state) is not in the writable state and cannot be closed`));
+    }
+    const promise = newPromise((resolve, reject) => {
+        const closeRequest = {
+            _resolve: resolve,
+            _reject: reject
+        };
+        stream._closeRequest = closeRequest;
+    });
+    const writer = stream._writer;
+    if (writer !== undefined && stream._backpressure && state === 'writable') {
+        defaultWriterReadyPromiseResolve(writer);
+    }
+    WritableStreamDefaultControllerClose(stream._writableStreamController);
+    return promise;
+}
+// WritableStream API exposed for controllers.
+function WritableStreamAddWriteRequest(stream) {
+    const promise = newPromise((resolve, reject) => {
+        const writeRequest = {
+            _resolve: resolve,
+            _reject: reject
+        };
+        stream._writeRequests.push(writeRequest);
+    });
+    return promise;
+}
+function WritableStreamDealWithRejection(stream, error) {
+    const state = stream._state;
+    if (state === 'writable') {
+        WritableStreamStartErroring(stream, error);
+        return;
+    }
+    WritableStreamFinishErroring(stream);
+}
+function WritableStreamStartErroring(stream, reason) {
+    const controller = stream._writableStreamController;
+    stream._state = 'erroring';
+    stream._storedError = reason;
+    const writer = stream._writer;
+    if (writer !== undefined) {
+        WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);
+    }
+    if (!WritableStreamHasOperationMarkedInFlight(stream) && controller._started) {
+        WritableStreamFinishErroring(stream);
+    }
+}
+function WritableStreamFinishErroring(stream) {
+    stream._state = 'errored';
+    stream._writableStreamController[ErrorSteps]();
+    const storedError = stream._storedError;
+    stream._writeRequests.forEach(writeRequest => {
+        writeRequest._reject(storedError);
+    });
+    stream._writeRequests = new SimpleQueue();
+    if (stream._pendingAbortRequest === undefined) {
+        WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+        return;
+    }
+    const abortRequest = stream._pendingAbortRequest;
+    stream._pendingAbortRequest = undefined;
+    if (abortRequest._wasAlreadyErroring) {
+        abortRequest._reject(storedError);
+        WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+        return;
+    }
+    const promise = stream._writableStreamController[AbortSteps](abortRequest._reason);
+    uponPromise(promise, () => {
+        abortRequest._resolve();
+        WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+    }, (reason) => {
+        abortRequest._reject(reason);
+        WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+    });
+}
+function WritableStreamFinishInFlightWrite(stream) {
+    stream._inFlightWriteRequest._resolve(undefined);
+    stream._inFlightWriteRequest = undefined;
+}
+function WritableStreamFinishInFlightWriteWithError(stream, error) {
+    stream._inFlightWriteRequest._reject(error);
+    stream._inFlightWriteRequest = undefined;
+    WritableStreamDealWithRejection(stream, error);
+}
+function WritableStreamFinishInFlightClose(stream) {
+    stream._inFlightCloseRequest._resolve(undefined);
+    stream._inFlightCloseRequest = undefined;
+    const state = stream._state;
+    if (state === 'erroring') {
+        // The error was too late to do anything, so it is ignored.
+        stream._storedError = undefined;
+        if (stream._pendingAbortRequest !== undefined) {
+            stream._pendingAbortRequest._resolve();
+            stream._pendingAbortRequest = undefined;
+        }
+    }
+    stream._state = 'closed';
+    const writer = stream._writer;
+    if (writer !== undefined) {
+        defaultWriterClosedPromiseResolve(writer);
+    }
+}
+function WritableStreamFinishInFlightCloseWithError(stream, error) {
+    stream._inFlightCloseRequest._reject(error);
+    stream._inFlightCloseRequest = undefined;
+    // Never execute sink abort() after sink close().
+    if (stream._pendingAbortRequest !== undefined) {
+        stream._pendingAbortRequest._reject(error);
+        stream._pendingAbortRequest = undefined;
+    }
+    WritableStreamDealWithRejection(stream, error);
+}
+// TODO(ricea): Fix alphabetical order.
+function WritableStreamCloseQueuedOrInFlight(stream) {
+    if (stream._closeRequest === undefined && stream._inFlightCloseRequest === undefined) {
+        return false;
+    }
+    return true;
+}
+function WritableStreamHasOperationMarkedInFlight(stream) {
+    if (stream._inFlightWriteRequest === undefined && stream._inFlightCloseRequest === undefined) {
+        return false;
+    }
+    return true;
+}
+function WritableStreamMarkCloseRequestInFlight(stream) {
+    stream._inFlightCloseRequest = stream._closeRequest;
+    stream._closeRequest = undefined;
+}
+function WritableStreamMarkFirstWriteRequestInFlight(stream) {
+    stream._inFlightWriteRequest = stream._writeRequests.shift();
+}
+function WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream) {
+    if (stream._closeRequest !== undefined) {
+        stream._closeRequest._reject(stream._storedError);
+        stream._closeRequest = undefined;
+    }
+    const writer = stream._writer;
+    if (writer !== undefined) {
+        defaultWriterClosedPromiseReject(writer, stream._storedError);
+    }
+}
+function WritableStreamUpdateBackpressure(stream, backpressure) {
+    const writer = stream._writer;
+    if (writer !== undefined && backpressure !== stream._backpressure) {
+        if (backpressure) {
+            defaultWriterReadyPromiseReset(writer);
+        }
+        else {
+            defaultWriterReadyPromiseResolve(writer);
+        }
+    }
+    stream._backpressure = backpressure;
+}
+/**
+ * A default writer vended by a {@link WritableStream}.
+ *
+ * @public
+ */
+class WritableStreamDefaultWriter {
+    constructor(stream) {
+        assertRequiredArgument(stream, 1, 'WritableStreamDefaultWriter');
+        assertWritableStream(stream, 'First parameter');
+        if (IsWritableStreamLocked(stream)) {
+            throw new TypeError('This stream has already been locked for exclusive writing by another writer');
+        }
+        this._ownerWritableStream = stream;
+        stream._writer = this;
+        const state = stream._state;
+        if (state === 'writable') {
+            if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._backpressure) {
+                defaultWriterReadyPromiseInitialize(this);
+            }
+            else {
+                defaultWriterReadyPromiseInitializeAsResolved(this);
+            }
+            defaultWriterClosedPromiseInitialize(this);
+        }
+        else if (state === 'erroring') {
+            defaultWriterReadyPromiseInitializeAsRejected(this, stream._storedError);
+            defaultWriterClosedPromiseInitialize(this);
+        }
+        else if (state === 'closed') {
+            defaultWriterReadyPromiseInitializeAsResolved(this);
+            defaultWriterClosedPromiseInitializeAsResolved(this);
+        }
+        else {
+            const storedError = stream._storedError;
+            defaultWriterReadyPromiseInitializeAsRejected(this, storedError);
+            defaultWriterClosedPromiseInitializeAsRejected(this, storedError);
+        }
+    }
+    /**
+     * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or
+     * the writer’s lock is released before the stream finishes closing.
+     */
+    get closed() {
+        if (!IsWritableStreamDefaultWriter(this)) {
+            return promiseRejectedWith(defaultWriterBrandCheckException('closed'));
+        }
+        return this._closedPromise;
+    }
+    /**
+     * Returns the desired size to fill the stream’s internal queue. It can be negative, if the queue is over-full.
+     * A producer can use this information to determine the right amount of data to write.
+     *
+     * It will be `null` if the stream cannot be successfully written to (due to either being errored, or having an abort
+     * queued up). It will return zero if the stream is closed. And the getter will throw an exception if invoked when
+     * the writer’s lock is released.
+     */
+    get desiredSize() {
+        if (!IsWritableStreamDefaultWriter(this)) {
+            throw defaultWriterBrandCheckException('desiredSize');
+        }
+        if (this._ownerWritableStream === undefined) {
+            throw defaultWriterLockException('desiredSize');
+        }
+        return WritableStreamDefaultWriterGetDesiredSize(this);
+    }
+    /**
+     * Returns a promise that will be fulfilled when the desired size to fill the stream’s internal queue transitions
+     * from non-positive to positive, signaling that it is no longer applying backpressure. Once the desired size dips
+     * back to zero or below, the getter will return a new promise that stays pending until the next transition.
+     *
+     * If the stream becomes errored or aborted, or the writer’s lock is released, the returned promise will become
+     * rejected.
+     */
+    get ready() {
+        if (!IsWritableStreamDefaultWriter(this)) {
+            return promiseRejectedWith(defaultWriterBrandCheckException('ready'));
+        }
+        return this._readyPromise;
+    }
+    /**
+     * If the reader is active, behaves the same as {@link WritableStream.abort | stream.abort(reason)}.
+     */
+    abort(reason = undefined) {
+        if (!IsWritableStreamDefaultWriter(this)) {
+            return promiseRejectedWith(defaultWriterBrandCheckException('abort'));
+        }
+        if (this._ownerWritableStream === undefined) {
+            return promiseRejectedWith(defaultWriterLockException('abort'));
+        }
+        return WritableStreamDefaultWriterAbort(this, reason);
+    }
+    /**
+     * If the reader is active, behaves the same as {@link WritableStream.close | stream.close()}.
+     */
+    close() {
+        if (!IsWritableStreamDefaultWriter(this)) {
+            return promiseRejectedWith(defaultWriterBrandCheckException('close'));
+        }
+        const stream = this._ownerWritableStream;
+        if (stream === undefined) {
+            return promiseRejectedWith(defaultWriterLockException('close'));
+        }
+        if (WritableStreamCloseQueuedOrInFlight(stream)) {
+            return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));
+        }
+        return WritableStreamDefaultWriterClose(this);
+    }
+    /**
+     * Releases the writer’s lock on the corresponding stream. After the lock is released, the writer is no longer active.
+     * If the associated stream is errored when the lock is released, the writer will appear errored in the same way from
+     * now on; otherwise, the writer will appear closed.
+     *
+     * Note that the lock can still be released even if some ongoing writes have not yet finished (i.e. even if the
+     * promises returned from previous calls to {@link WritableStreamDefaultWriter.write | write()} have not yet settled).
+     * It’s not necessary to hold the lock on the writer for the duration of the write; the lock instead simply prevents
+     * other producers from writing in an interleaved manner.
+     */
+    releaseLock() {
+        if (!IsWritableStreamDefaultWriter(this)) {
+            throw defaultWriterBrandCheckException('releaseLock');
+        }
+        const stream = this._ownerWritableStream;
+        if (stream === undefined) {
+            return;
+        }
+        WritableStreamDefaultWriterRelease(this);
+    }
+    write(chunk = undefined) {
+        if (!IsWritableStreamDefaultWriter(this)) {
+            return promiseRejectedWith(defaultWriterBrandCheckException('write'));
+        }
+        if (this._ownerWritableStream === undefined) {
+            return promiseRejectedWith(defaultWriterLockException('write to'));
+        }
+        return WritableStreamDefaultWriterWrite(this, chunk);
+    }
+}
+Object.defineProperties(WritableStreamDefaultWriter.prototype, {
+    abort: { enumerable: true },
+    close: { enumerable: true },
+    releaseLock: { enumerable: true },
+    write: { enumerable: true },
+    closed: { enumerable: true },
+    desiredSize: { enumerable: true },
+    ready: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(WritableStreamDefaultWriter.prototype, SymbolPolyfill.toStringTag, {
+        value: 'WritableStreamDefaultWriter',
+        configurable: true
+    });
+}
+// Abstract operations for the WritableStreamDefaultWriter.
+function IsWritableStreamDefaultWriter(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) {
+        return false;
+    }
+    return x instanceof WritableStreamDefaultWriter;
+}
+// A client of WritableStreamDefaultWriter may use these functions directly to bypass state check.
+function WritableStreamDefaultWriterAbort(writer, reason) {
+    const stream = writer._ownerWritableStream;
+    return WritableStreamAbort(stream, reason);
+}
+function WritableStreamDefaultWriterClose(writer) {
+    const stream = writer._ownerWritableStream;
+    return WritableStreamClose(stream);
+}
+function WritableStreamDefaultWriterCloseWithErrorPropagation(writer) {
+    const stream = writer._ownerWritableStream;
+    const state = stream._state;
+    if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {
+        return promiseResolvedWith(undefined);
+    }
+    if (state === 'errored') {
+        return promiseRejectedWith(stream._storedError);
+    }
+    return WritableStreamDefaultWriterClose(writer);
+}
+function WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, error) {
+    if (writer._closedPromiseState === 'pending') {
+        defaultWriterClosedPromiseReject(writer, error);
+    }
+    else {
+        defaultWriterClosedPromiseResetToRejected(writer, error);
+    }
+}
+function WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, error) {
+    if (writer._readyPromiseState === 'pending') {
+        defaultWriterReadyPromiseReject(writer, error);
+    }
+    else {
+        defaultWriterReadyPromiseResetToRejected(writer, error);
+    }
+}
+function WritableStreamDefaultWriterGetDesiredSize(writer) {
+    const stream = writer._ownerWritableStream;
+    const state = stream._state;
+    if (state === 'errored' || state === 'erroring') {
+        return null;
+    }
+    if (state === 'closed') {
+        return 0;
+    }
+    return WritableStreamDefaultControllerGetDesiredSize(stream._writableStreamController);
+}
+function WritableStreamDefaultWriterRelease(writer) {
+    const stream = writer._ownerWritableStream;
+    const releasedError = new TypeError(`Writer was released and can no longer be used to monitor the stream's closedness`);
+    WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, releasedError);
+    // The state transitions to "errored" before the sink abort() method runs, but the writer.closed promise is not
+    // rejected until afterwards. This means that simply testing state will not work.
+    WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, releasedError);
+    stream._writer = undefined;
+    writer._ownerWritableStream = undefined;
+}
+function WritableStreamDefaultWriterWrite(writer, chunk) {
+    const stream = writer._ownerWritableStream;
+    const controller = stream._writableStreamController;
+    const chunkSize = WritableStreamDefaultControllerGetChunkSize(controller, chunk);
+    if (stream !== writer._ownerWritableStream) {
+        return promiseRejectedWith(defaultWriterLockException('write to'));
+    }
+    const state = stream._state;
+    if (state === 'errored') {
+        return promiseRejectedWith(stream._storedError);
+    }
+    if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {
+        return promiseRejectedWith(new TypeError('The stream is closing or closed and cannot be written to'));
+    }
+    if (state === 'erroring') {
+        return promiseRejectedWith(stream._storedError);
+    }
+    const promise = WritableStreamAddWriteRequest(stream);
+    WritableStreamDefaultControllerWrite(controller, chunk, chunkSize);
+    return promise;
+}
+const closeSentinel = {};
+/**
+ * Allows control of a {@link WritableStream | writable stream}'s state and internal queue.
+ *
+ * @public
+ */
+class WritableStreamDefaultController {
+    constructor() {
+        throw new TypeError('Illegal constructor');
+    }
+    /**
+     * The reason which was passed to `WritableStream.abort(reason)` when the stream was aborted.
+     *
+     * @deprecated
+     *  This property has been removed from the specification, see https://github.com/whatwg/streams/pull/1177.
+     *  Use {@link WritableStreamDefaultController.signal}'s `reason` instead.
+     */
+    get abortReason() {
+        if (!IsWritableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$2('abortReason');
+        }
+        return this._abortReason;
+    }
+    /**
+     * An `AbortSignal` that can be used to abort the pending write or close operation when the stream is aborted.
+     */
+    get signal() {
+        if (!IsWritableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$2('signal');
+        }
+        if (this._abortController === undefined) {
+            // Older browsers or older Node versions may not support `AbortController` or `AbortSignal`.
+            // We don't want to bundle and ship an `AbortController` polyfill together with our polyfill,
+            // so instead we only implement support for `signal` if we find a global `AbortController` constructor.
+            throw new TypeError('WritableStreamDefaultController.prototype.signal is not supported');
+        }
+        return this._abortController.signal;
+    }
+    /**
+     * Closes the controlled writable stream, making all future interactions with it fail with the given error `e`.
+     *
+     * This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying
+     * sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the
+     * normal lifecycle of interactions with the underlying sink.
+     */
+    error(e = undefined) {
+        if (!IsWritableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$2('error');
+        }
+        const state = this._controlledWritableStream._state;
+        if (state !== 'writable') {
+            // The stream is closed, errored or will be soon. The sink can't do anything useful if it gets an error here, so
+            // just treat it as a no-op.
+            return;
+        }
+        WritableStreamDefaultControllerError(this, e);
+    }
+    /** @internal */
+    [AbortSteps](reason) {
+        const result = this._abortAlgorithm(reason);
+        WritableStreamDefaultControllerClearAlgorithms(this);
+        return result;
+    }
+    /** @internal */
+    [ErrorSteps]() {
+        ResetQueue(this);
+    }
+}
+Object.defineProperties(WritableStreamDefaultController.prototype, {
+    abortReason: { enumerable: true },
+    signal: { enumerable: true },
+    error: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(WritableStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+        value: 'WritableStreamDefaultController',
+        configurable: true
+    });
+}
+// Abstract operations implementing interface required by the WritableStream.
+function IsWritableStreamDefaultController(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_controlledWritableStream')) {
+        return false;
+    }
+    return x instanceof WritableStreamDefaultController;
+}
+function SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm) {
+    controller._controlledWritableStream = stream;
+    stream._writableStreamController = controller;
+    // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.
+    controller._queue = undefined;
+    controller._queueTotalSize = undefined;
+    ResetQueue(controller);
+    controller._abortReason = undefined;
+    controller._abortController = createAbortController();
+    controller._started = false;
+    controller._strategySizeAlgorithm = sizeAlgorithm;
+    controller._strategyHWM = highWaterMark;
+    controller._writeAlgorithm = writeAlgorithm;
+    controller._closeAlgorithm = closeAlgorithm;
+    controller._abortAlgorithm = abortAlgorithm;
+    const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+    WritableStreamUpdateBackpressure(stream, backpressure);
+    const startResult = startAlgorithm();
+    const startPromise = promiseResolvedWith(startResult);
+    uponPromise(startPromise, () => {
+        controller._started = true;
+        WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+    }, r => {
+        controller._started = true;
+        WritableStreamDealWithRejection(stream, r);
+    });
+}
+function SetUpWritableStreamDefaultControllerFromUnderlyingSink(stream, underlyingSink, highWaterMark, sizeAlgorithm) {
+    const controller = Object.create(WritableStreamDefaultController.prototype);
+    let startAlgorithm = () => undefined;
+    let writeAlgorithm = () => promiseResolvedWith(undefined);
+    let closeAlgorithm = () => promiseResolvedWith(undefined);
+    let abortAlgorithm = () => promiseResolvedWith(undefined);
+    if (underlyingSink.start !== undefined) {
+        startAlgorithm = () => underlyingSink.start(controller);
+    }
+    if (underlyingSink.write !== undefined) {
+        writeAlgorithm = chunk => underlyingSink.write(chunk, controller);
+    }
+    if (underlyingSink.close !== undefined) {
+        closeAlgorithm = () => underlyingSink.close();
+    }
+    if (underlyingSink.abort !== undefined) {
+        abortAlgorithm = reason => underlyingSink.abort(reason);
+    }
+    SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm);
+}
+// ClearAlgorithms may be called twice. Erroring the same stream in multiple ways will often result in redundant calls.
+function WritableStreamDefaultControllerClearAlgorithms(controller) {
+    controller._writeAlgorithm = undefined;
+    controller._closeAlgorithm = undefined;
+    controller._abortAlgorithm = undefined;
+    controller._strategySizeAlgorithm = undefined;
+}
+function WritableStreamDefaultControllerClose(controller) {
+    EnqueueValueWithSize(controller, closeSentinel, 0);
+    WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+}
+function WritableStreamDefaultControllerGetChunkSize(controller, chunk) {
+    try {
+        return controller._strategySizeAlgorithm(chunk);
+    }
+    catch (chunkSizeE) {
+        WritableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE);
+        return 1;
+    }
+}
+function WritableStreamDefaultControllerGetDesiredSize(controller) {
+    return controller._strategyHWM - controller._queueTotalSize;
+}
+function WritableStreamDefaultControllerWrite(controller, chunk, chunkSize) {
+    try {
+        EnqueueValueWithSize(controller, chunk, chunkSize);
+    }
+    catch (enqueueE) {
+        WritableStreamDefaultControllerErrorIfNeeded(controller, enqueueE);
+        return;
+    }
+    const stream = controller._controlledWritableStream;
+    if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._state === 'writable') {
+        const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+        WritableStreamUpdateBackpressure(stream, backpressure);
+    }
+    WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+}
+// Abstract operations for the WritableStreamDefaultController.
+function WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller) {
+    const stream = controller._controlledWritableStream;
+    if (!controller._started) {
+        return;
+    }
+    if (stream._inFlightWriteRequest !== undefined) {
+        return;
+    }
+    const state = stream._state;
+    if (state === 'erroring') {
+        WritableStreamFinishErroring(stream);
+        return;
+    }
+    if (controller._queue.length === 0) {
+        return;
+    }
+    const value = PeekQueueValue(controller);
+    if (value === closeSentinel) {
+        WritableStreamDefaultControllerProcessClose(controller);
+    }
+    else {
+        WritableStreamDefaultControllerProcessWrite(controller, value);
+    }
+}
+function WritableStreamDefaultControllerErrorIfNeeded(controller, error) {
+    if (controller._controlledWritableStream._state === 'writable') {
+        WritableStreamDefaultControllerError(controller, error);
+    }
+}
+function WritableStreamDefaultControllerProcessClose(controller) {
+    const stream = controller._controlledWritableStream;
+    WritableStreamMarkCloseRequestInFlight(stream);
+    DequeueValue(controller);
+    const sinkClosePromise = controller._closeAlgorithm();
+    WritableStreamDefaultControllerClearAlgorithms(controller);
+    uponPromise(sinkClosePromise, () => {
+        WritableStreamFinishInFlightClose(stream);
+    }, reason => {
+        WritableStreamFinishInFlightCloseWithError(stream, reason);
+    });
+}
+function WritableStreamDefaultControllerProcessWrite(controller, chunk) {
+    const stream = controller._controlledWritableStream;
+    WritableStreamMarkFirstWriteRequestInFlight(stream);
+    const sinkWritePromise = controller._writeAlgorithm(chunk);
+    uponPromise(sinkWritePromise, () => {
+        WritableStreamFinishInFlightWrite(stream);
+        const state = stream._state;
+        DequeueValue(controller);
+        if (!WritableStreamCloseQueuedOrInFlight(stream) && state === 'writable') {
+            const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+            WritableStreamUpdateBackpressure(stream, backpressure);
+        }
+        WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+    }, reason => {
+        if (stream._state === 'writable') {
+            WritableStreamDefaultControllerClearAlgorithms(controller);
+        }
+        WritableStreamFinishInFlightWriteWithError(stream, reason);
+    });
+}
+function WritableStreamDefaultControllerGetBackpressure(controller) {
+    const desiredSize = WritableStreamDefaultControllerGetDesiredSize(controller);
+    return desiredSize <= 0;
+}
+// A client of WritableStreamDefaultController may use these functions directly to bypass state check.
+function WritableStreamDefaultControllerError(controller, error) {
+    const stream = controller._controlledWritableStream;
+    WritableStreamDefaultControllerClearAlgorithms(controller);
+    WritableStreamStartErroring(stream, error);
+}
+// Helper functions for the WritableStream.
+function streamBrandCheckException$2(name) {
+    return new TypeError(`WritableStream.prototype.${name} can only be used on a WritableStream`);
+}
+// Helper functions for the WritableStreamDefaultController.
+function defaultControllerBrandCheckException$2(name) {
+    return new TypeError(`WritableStreamDefaultController.prototype.${name} can only be used on a WritableStreamDefaultController`);
+}
+// Helper functions for the WritableStreamDefaultWriter.
+function defaultWriterBrandCheckException(name) {
+    return new TypeError(`WritableStreamDefaultWriter.prototype.${name} can only be used on a WritableStreamDefaultWriter`);
+}
+function defaultWriterLockException(name) {
+    return new TypeError('Cannot ' + name + ' a stream using a released writer');
+}
+function defaultWriterClosedPromiseInitialize(writer) {
+    writer._closedPromise = newPromise((resolve, reject) => {
+        writer._closedPromise_resolve = resolve;
+        writer._closedPromise_reject = reject;
+        writer._closedPromiseState = 'pending';
+    });
+}
+function defaultWriterClosedPromiseInitializeAsRejected(writer, reason) {
+    defaultWriterClosedPromiseInitialize(writer);
+    defaultWriterClosedPromiseReject(writer, reason);
+}
+function defaultWriterClosedPromiseInitializeAsResolved(writer) {
+    defaultWriterClosedPromiseInitialize(writer);
+    defaultWriterClosedPromiseResolve(writer);
+}
+function defaultWriterClosedPromiseReject(writer, reason) {
+    if (writer._closedPromise_reject === undefined) {
+        return;
+    }
+    setPromiseIsHandledToTrue(writer._closedPromise);
+    writer._closedPromise_reject(reason);
+    writer._closedPromise_resolve = undefined;
+    writer._closedPromise_reject = undefined;
+    writer._closedPromiseState = 'rejected';
+}
+function defaultWriterClosedPromiseResetToRejected(writer, reason) {
+    defaultWriterClosedPromiseInitializeAsRejected(writer, reason);
+}
+function defaultWriterClosedPromiseResolve(writer) {
+    if (writer._closedPromise_resolve === undefined) {
+        return;
+    }
+    writer._closedPromise_resolve(undefined);
+    writer._closedPromise_resolve = undefined;
+    writer._closedPromise_reject = undefined;
+    writer._closedPromiseState = 'resolved';
+}
+function defaultWriterReadyPromiseInitialize(writer) {
+    writer._readyPromise = newPromise((resolve, reject) => {
+        writer._readyPromise_resolve = resolve;
+        writer._readyPromise_reject = reject;
+    });
+    writer._readyPromiseState = 'pending';
+}
+function defaultWriterReadyPromiseInitializeAsRejected(writer, reason) {
+    defaultWriterReadyPromiseInitialize(writer);
+    defaultWriterReadyPromiseReject(writer, reason);
+}
+function defaultWriterReadyPromiseInitializeAsResolved(writer) {
+    defaultWriterReadyPromiseInitialize(writer);
+    defaultWriterReadyPromiseResolve(writer);
+}
+function defaultWriterReadyPromiseReject(writer, reason) {
+    if (writer._readyPromise_reject === undefined) {
+        return;
+    }
+    setPromiseIsHandledToTrue(writer._readyPromise);
+    writer._readyPromise_reject(reason);
+    writer._readyPromise_resolve = undefined;
+    writer._readyPromise_reject = undefined;
+    writer._readyPromiseState = 'rejected';
+}
+function defaultWriterReadyPromiseReset(writer) {
+    defaultWriterReadyPromiseInitialize(writer);
+}
+function defaultWriterReadyPromiseResetToRejected(writer, reason) {
+    defaultWriterReadyPromiseInitializeAsRejected(writer, reason);
+}
+function defaultWriterReadyPromiseResolve(writer) {
+    if (writer._readyPromise_resolve === undefined) {
+        return;
+    }
+    writer._readyPromise_resolve(undefined);
+    writer._readyPromise_resolve = undefined;
+    writer._readyPromise_reject = undefined;
+    writer._readyPromiseState = 'fulfilled';
+}
+
+/// <reference lib="dom" />
+const NativeDOMException = typeof DOMException !== 'undefined' ? DOMException : undefined;
+
+/// <reference types="node" />
+function isDOMExceptionConstructor(ctor) {
+    if (!(typeof ctor === 'function' || typeof ctor === 'object')) {
+        return false;
+    }
+    try {
+        new ctor();
+        return true;
+    }
+    catch (_a) {
+        return false;
+    }
+}
+function createDOMExceptionPolyfill() {
+    // eslint-disable-next-line no-shadow
+    const ctor = function DOMException(message, name) {
+        this.message = message || '';
+        this.name = name || 'Error';
+        if (Error.captureStackTrace) {
+            Error.captureStackTrace(this, this.constructor);
+        }
+    };
+    ctor.prototype = Object.create(Error.prototype);
+    Object.defineProperty(ctor.prototype, 'constructor', { value: ctor, writable: true, configurable: true });
+    return ctor;
+}
+// eslint-disable-next-line no-redeclare
+const DOMException$1 = isDOMExceptionConstructor(NativeDOMException) ? NativeDOMException : createDOMExceptionPolyfill();
+
+function ReadableStreamPipeTo(source, dest, preventClose, preventAbort, preventCancel, signal) {
+    const reader = AcquireReadableStreamDefaultReader(source);
+    const writer = AcquireWritableStreamDefaultWriter(dest);
+    source._disturbed = true;
+    let shuttingDown = false;
+    // This is used to keep track of the spec's requirement that we wait for ongoing writes during shutdown.
+    let currentWrite = promiseResolvedWith(undefined);
+    return newPromise((resolve, reject) => {
+        let abortAlgorithm;
+        if (signal !== undefined) {
+            abortAlgorithm = () => {
+                const error = new DOMException$1('Aborted', 'AbortError');
+                const actions = [];
+                if (!preventAbort) {
+                    actions.push(() => {
+                        if (dest._state === 'writable') {
+                            return WritableStreamAbort(dest, error);
+                        }
+                        return promiseResolvedWith(undefined);
+                    });
+                }
+                if (!preventCancel) {
+                    actions.push(() => {
+                        if (source._state === 'readable') {
+                            return ReadableStreamCancel(source, error);
+                        }
+                        return promiseResolvedWith(undefined);
+                    });
+                }
+                shutdownWithAction(() => Promise.all(actions.map(action => action())), true, error);
+            };
+            if (signal.aborted) {
+                abortAlgorithm();
+                return;
+            }
+            signal.addEventListener('abort', abortAlgorithm);
+        }
+        // Using reader and writer, read all chunks from this and write them to dest
+        // - Backpressure must be enforced
+        // - Shutdown must stop all activity
+        function pipeLoop() {
+            return newPromise((resolveLoop, rejectLoop) => {
+                function next(done) {
+                    if (done) {
+                        resolveLoop();
+                    }
+                    else {
+                        // Use `PerformPromiseThen` instead of `uponPromise` to avoid
+                        // adding unnecessary `.catch(rethrowAssertionErrorRejection)` handlers
+                        PerformPromiseThen(pipeStep(), next, rejectLoop);
+                    }
+                }
+                next(false);
+            });
+        }
+        function pipeStep() {
+            if (shuttingDown) {
+                return promiseResolvedWith(true);
+            }
+            return PerformPromiseThen(writer._readyPromise, () => {
+                return newPromise((resolveRead, rejectRead) => {
+                    ReadableStreamDefaultReaderRead(reader, {
+                        _chunkSteps: chunk => {
+                            currentWrite = PerformPromiseThen(WritableStreamDefaultWriterWrite(writer, chunk), undefined, noop);
+                            resolveRead(false);
+                        },
+                        _closeSteps: () => resolveRead(true),
+                        _errorSteps: rejectRead
+                    });
+                });
+            });
+        }
+        // Errors must be propagated forward
+        isOrBecomesErrored(source, reader._closedPromise, storedError => {
+            if (!preventAbort) {
+                shutdownWithAction(() => WritableStreamAbort(dest, storedError), true, storedError);
+            }
+            else {
+                shutdown(true, storedError);
+            }
+        });
+        // Errors must be propagated backward
+        isOrBecomesErrored(dest, writer._closedPromise, storedError => {
+            if (!preventCancel) {
+                shutdownWithAction(() => ReadableStreamCancel(source, storedError), true, storedError);
+            }
+            else {
+                shutdown(true, storedError);
+            }
+        });
+        // Closing must be propagated forward
+        isOrBecomesClosed(source, reader._closedPromise, () => {
+            if (!preventClose) {
+                shutdownWithAction(() => WritableStreamDefaultWriterCloseWithErrorPropagation(writer));
+            }
+            else {
+                shutdown();
+            }
+        });
+        // Closing must be propagated backward
+        if (WritableStreamCloseQueuedOrInFlight(dest) || dest._state === 'closed') {
+            const destClosed = new TypeError('the destination writable stream closed before all data could be piped to it');
+            if (!preventCancel) {
+                shutdownWithAction(() => ReadableStreamCancel(source, destClosed), true, destClosed);
+            }
+            else {
+                shutdown(true, destClosed);
+            }
+        }
+        setPromiseIsHandledToTrue(pipeLoop());
+        function waitForWritesToFinish() {
+            // Another write may have started while we were waiting on this currentWrite, so we have to be sure to wait
+            // for that too.
+            const oldCurrentWrite = currentWrite;
+            return PerformPromiseThen(currentWrite, () => oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined);
+        }
+        function isOrBecomesErrored(stream, promise, action) {
+            if (stream._state === 'errored') {
+                action(stream._storedError);
+            }
+            else {
+                uponRejection(promise, action);
+            }
+        }
+        function isOrBecomesClosed(stream, promise, action) {
+            if (stream._state === 'closed') {
+                action();
+            }
+            else {
+                uponFulfillment(promise, action);
+            }
+        }
+        function shutdownWithAction(action, originalIsError, originalError) {
+            if (shuttingDown) {
+                return;
+            }
+            shuttingDown = true;
+            if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {
+                uponFulfillment(waitForWritesToFinish(), doTheRest);
+            }
+            else {
+                doTheRest();
+            }
+            function doTheRest() {
+                uponPromise(action(), () => finalize(originalIsError, originalError), newError => finalize(true, newError));
+            }
+        }
+        function shutdown(isError, error) {
+            if (shuttingDown) {
+                return;
+            }
+            shuttingDown = true;
+            if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {
+                uponFulfillment(waitForWritesToFinish(), () => finalize(isError, error));
+            }
+            else {
+                finalize(isError, error);
+            }
+        }
+        function finalize(isError, error) {
+            WritableStreamDefaultWriterRelease(writer);
+            ReadableStreamReaderGenericRelease(reader);
+            if (signal !== undefined) {
+                signal.removeEventListener('abort', abortAlgorithm);
+            }
+            if (isError) {
+                reject(error);
+            }
+            else {
+                resolve(undefined);
+            }
+        }
+    });
+}
+
+/**
+ * Allows control of a {@link ReadableStream | readable stream}'s state and internal queue.
+ *
+ * @public
+ */
+class ReadableStreamDefaultController {
+    constructor() {
+        throw new TypeError('Illegal constructor');
+    }
+    /**
+     * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is
+     * over-full. An underlying source ought to use this information to determine when and how to apply backpressure.
+     */
+    get desiredSize() {
+        if (!IsReadableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$1('desiredSize');
+        }
+        return ReadableStreamDefaultControllerGetDesiredSize(this);
+    }
+    /**
+     * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from
+     * the stream, but once those are read, the stream will become closed.
+     */
+    close() {
+        if (!IsReadableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$1('close');
+        }
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {
+            throw new TypeError('The stream is not in a state that permits close');
+        }
+        ReadableStreamDefaultControllerClose(this);
+    }
+    enqueue(chunk = undefined) {
+        if (!IsReadableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$1('enqueue');
+        }
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {
+            throw new TypeError('The stream is not in a state that permits enqueue');
+        }
+        return ReadableStreamDefaultControllerEnqueue(this, chunk);
+    }
+    /**
+     * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.
+     */
+    error(e = undefined) {
+        if (!IsReadableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$1('error');
+        }
+        ReadableStreamDefaultControllerError(this, e);
+    }
+    /** @internal */
+    [CancelSteps](reason) {
+        ResetQueue(this);
+        const result = this._cancelAlgorithm(reason);
+        ReadableStreamDefaultControllerClearAlgorithms(this);
+        return result;
+    }
+    /** @internal */
+    [PullSteps](readRequest) {
+        const stream = this._controlledReadableStream;
+        if (this._queue.length > 0) {
+            const chunk = DequeueValue(this);
+            if (this._closeRequested && this._queue.length === 0) {
+                ReadableStreamDefaultControllerClearAlgorithms(this);
+                ReadableStreamClose(stream);
+            }
+            else {
+                ReadableStreamDefaultControllerCallPullIfNeeded(this);
+            }
+            readRequest._chunkSteps(chunk);
+        }
+        else {
+            ReadableStreamAddReadRequest(stream, readRequest);
+            ReadableStreamDefaultControllerCallPullIfNeeded(this);
+        }
+    }
+}
+Object.defineProperties(ReadableStreamDefaultController.prototype, {
+    close: { enumerable: true },
+    enqueue: { enumerable: true },
+    error: { enumerable: true },
+    desiredSize: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableStreamDefaultController',
+        configurable: true
+    });
+}
+// Abstract operations for the ReadableStreamDefaultController.
+function IsReadableStreamDefaultController(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableStream')) {
+        return false;
+    }
+    return x instanceof ReadableStreamDefaultController;
+}
+function ReadableStreamDefaultControllerCallPullIfNeeded(controller) {
+    const shouldPull = ReadableStreamDefaultControllerShouldCallPull(controller);
+    if (!shouldPull) {
+        return;
+    }
+    if (controller._pulling) {
+        controller._pullAgain = true;
+        return;
+    }
+    controller._pulling = true;
+    const pullPromise = controller._pullAlgorithm();
+    uponPromise(pullPromise, () => {
+        controller._pulling = false;
+        if (controller._pullAgain) {
+            controller._pullAgain = false;
+            ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+        }
+    }, e => {
+        ReadableStreamDefaultControllerError(controller, e);
+    });
+}
+function ReadableStreamDefaultControllerShouldCallPull(controller) {
+    const stream = controller._controlledReadableStream;
+    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+        return false;
+    }
+    if (!controller._started) {
+        return false;
+    }
+    if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+        return true;
+    }
+    const desiredSize = ReadableStreamDefaultControllerGetDesiredSize(controller);
+    if (desiredSize > 0) {
+        return true;
+    }
+    return false;
+}
+function ReadableStreamDefaultControllerClearAlgorithms(controller) {
+    controller._pullAlgorithm = undefined;
+    controller._cancelAlgorithm = undefined;
+    controller._strategySizeAlgorithm = undefined;
+}
+// A client of ReadableStreamDefaultController may use these functions directly to bypass state check.
+function ReadableStreamDefaultControllerClose(controller) {
+    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+        return;
+    }
+    const stream = controller._controlledReadableStream;
+    controller._closeRequested = true;
+    if (controller._queue.length === 0) {
+        ReadableStreamDefaultControllerClearAlgorithms(controller);
+        ReadableStreamClose(stream);
+    }
+}
+function ReadableStreamDefaultControllerEnqueue(controller, chunk) {
+    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+        return;
+    }
+    const stream = controller._controlledReadableStream;
+    if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+        ReadableStreamFulfillReadRequest(stream, chunk, false);
+    }
+    else {
+        let chunkSize;
+        try {
+            chunkSize = controller._strategySizeAlgorithm(chunk);
+        }
+        catch (chunkSizeE) {
+            ReadableStreamDefaultControllerError(controller, chunkSizeE);
+            throw chunkSizeE;
+        }
+        try {
+            EnqueueValueWithSize(controller, chunk, chunkSize);
+        }
+        catch (enqueueE) {
+            ReadableStreamDefaultControllerError(controller, enqueueE);
+            throw enqueueE;
+        }
+    }
+    ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+}
+function ReadableStreamDefaultControllerError(controller, e) {
+    const stream = controller._controlledReadableStream;
+    if (stream._state !== 'readable') {
+        return;
+    }
+    ResetQueue(controller);
+    ReadableStreamDefaultControllerClearAlgorithms(controller);
+    ReadableStreamError(stream, e);
+}
+function ReadableStreamDefaultControllerGetDesiredSize(controller) {
+    const state = controller._controlledReadableStream._state;
+    if (state === 'errored') {
+        return null;
+    }
+    if (state === 'closed') {
+        return 0;
+    }
+    return controller._strategyHWM - controller._queueTotalSize;
+}
+// This is used in the implementation of TransformStream.
+function ReadableStreamDefaultControllerHasBackpressure(controller) {
+    if (ReadableStreamDefaultControllerShouldCallPull(controller)) {
+        return false;
+    }
+    return true;
+}
+function ReadableStreamDefaultControllerCanCloseOrEnqueue(controller) {
+    const state = controller._controlledReadableStream._state;
+    if (!controller._closeRequested && state === 'readable') {
+        return true;
+    }
+    return false;
+}
+function SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm) {
+    controller._controlledReadableStream = stream;
+    controller._queue = undefined;
+    controller._queueTotalSize = undefined;
+    ResetQueue(controller);
+    controller._started = false;
+    controller._closeRequested = false;
+    controller._pullAgain = false;
+    controller._pulling = false;
+    controller._strategySizeAlgorithm = sizeAlgorithm;
+    controller._strategyHWM = highWaterMark;
+    controller._pullAlgorithm = pullAlgorithm;
+    controller._cancelAlgorithm = cancelAlgorithm;
+    stream._readableStreamController = controller;
+    const startResult = startAlgorithm();
+    uponPromise(promiseResolvedWith(startResult), () => {
+        controller._started = true;
+        ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+    }, r => {
+        ReadableStreamDefaultControllerError(controller, r);
+    });
+}
+function SetUpReadableStreamDefaultControllerFromUnderlyingSource(stream, underlyingSource, highWaterMark, sizeAlgorithm) {
+    const controller = Object.create(ReadableStreamDefaultController.prototype);
+    let startAlgorithm = () => undefined;
+    let pullAlgorithm = () => promiseResolvedWith(undefined);
+    let cancelAlgorithm = () => promiseResolvedWith(undefined);
+    if (underlyingSource.start !== undefined) {
+        startAlgorithm = () => underlyingSource.start(controller);
+    }
+    if (underlyingSource.pull !== undefined) {
+        pullAlgorithm = () => underlyingSource.pull(controller);
+    }
+    if (underlyingSource.cancel !== undefined) {
+        cancelAlgorithm = reason => underlyingSource.cancel(reason);
+    }
+    SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm);
+}
+// Helper functions for the ReadableStreamDefaultController.
+function defaultControllerBrandCheckException$1(name) {
+    return new TypeError(`ReadableStreamDefaultController.prototype.${name} can only be used on a ReadableStreamDefaultController`);
+}
+
+function ReadableStreamTee(stream, cloneForBranch2) {
+    if (IsReadableByteStreamController(stream._readableStreamController)) {
+        return ReadableByteStreamTee(stream);
+    }
+    return ReadableStreamDefaultTee(stream);
+}
+function ReadableStreamDefaultTee(stream, cloneForBranch2) {
+    const reader = AcquireReadableStreamDefaultReader(stream);
+    let reading = false;
+    let readAgain = false;
+    let canceled1 = false;
+    let canceled2 = false;
+    let reason1;
+    let reason2;
+    let branch1;
+    let branch2;
+    let resolveCancelPromise;
+    const cancelPromise = newPromise(resolve => {
+        resolveCancelPromise = resolve;
+    });
+    function pullAlgorithm() {
+        if (reading) {
+            readAgain = true;
+            return promiseResolvedWith(undefined);
+        }
+        reading = true;
+        const readRequest = {
+            _chunkSteps: chunk => {
+                // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                // successful synchronously-available reads get ahead of asynchronously-available errors.
+                queueMicrotask(() => {
+                    readAgain = false;
+                    const chunk1 = chunk;
+                    const chunk2 = chunk;
+                    // There is no way to access the cloning code right now in the reference implementation.
+                    // If we add one then we'll need an implementation for serializable objects.
+                    // if (!canceled2 && cloneForBranch2) {
+                    //   chunk2 = StructuredDeserialize(StructuredSerialize(chunk2));
+                    // }
+                    if (!canceled1) {
+                        ReadableStreamDefaultControllerEnqueue(branch1._readableStreamController, chunk1);
+                    }
+                    if (!canceled2) {
+                        ReadableStreamDefaultControllerEnqueue(branch2._readableStreamController, chunk2);
+                    }
+                    reading = false;
+                    if (readAgain) {
+                        pullAlgorithm();
+                    }
+                });
+            },
+            _closeSteps: () => {
+                reading = false;
+                if (!canceled1) {
+                    ReadableStreamDefaultControllerClose(branch1._readableStreamController);
+                }
+                if (!canceled2) {
+                    ReadableStreamDefaultControllerClose(branch2._readableStreamController);
+                }
+                if (!canceled1 || !canceled2) {
+                    resolveCancelPromise(undefined);
+                }
+            },
+            _errorSteps: () => {
+                reading = false;
+            }
+        };
+        ReadableStreamDefaultReaderRead(reader, readRequest);
+        return promiseResolvedWith(undefined);
+    }
+    function cancel1Algorithm(reason) {
+        canceled1 = true;
+        reason1 = reason;
+        if (canceled2) {
+            const compositeReason = CreateArrayFromList([reason1, reason2]);
+            const cancelResult = ReadableStreamCancel(stream, compositeReason);
+            resolveCancelPromise(cancelResult);
+        }
+        return cancelPromise;
+    }
+    function cancel2Algorithm(reason) {
+        canceled2 = true;
+        reason2 = reason;
+        if (canceled1) {
+            const compositeReason = CreateArrayFromList([reason1, reason2]);
+            const cancelResult = ReadableStreamCancel(stream, compositeReason);
+            resolveCancelPromise(cancelResult);
+        }
+        return cancelPromise;
+    }
+    function startAlgorithm() {
+        // do nothing
+    }
+    branch1 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel1Algorithm);
+    branch2 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel2Algorithm);
+    uponRejection(reader._closedPromise, (r) => {
+        ReadableStreamDefaultControllerError(branch1._readableStreamController, r);
+        ReadableStreamDefaultControllerError(branch2._readableStreamController, r);
+        if (!canceled1 || !canceled2) {
+            resolveCancelPromise(undefined);
+        }
+    });
+    return [branch1, branch2];
+}
+function ReadableByteStreamTee(stream) {
+    let reader = AcquireReadableStreamDefaultReader(stream);
+    let reading = false;
+    let readAgainForBranch1 = false;
+    let readAgainForBranch2 = false;
+    let canceled1 = false;
+    let canceled2 = false;
+    let reason1;
+    let reason2;
+    let branch1;
+    let branch2;
+    let resolveCancelPromise;
+    const cancelPromise = newPromise(resolve => {
+        resolveCancelPromise = resolve;
+    });
+    function forwardReaderError(thisReader) {
+        uponRejection(thisReader._closedPromise, r => {
+            if (thisReader !== reader) {
+                return;
+            }
+            ReadableByteStreamControllerError(branch1._readableStreamController, r);
+            ReadableByteStreamControllerError(branch2._readableStreamController, r);
+            if (!canceled1 || !canceled2) {
+                resolveCancelPromise(undefined);
+            }
+        });
+    }
+    function pullWithDefaultReader() {
+        if (IsReadableStreamBYOBReader(reader)) {
+            ReadableStreamReaderGenericRelease(reader);
+            reader = AcquireReadableStreamDefaultReader(stream);
+            forwardReaderError(reader);
+        }
+        const readRequest = {
+            _chunkSteps: chunk => {
+                // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                // successful synchronously-available reads get ahead of asynchronously-available errors.
+                queueMicrotask(() => {
+                    readAgainForBranch1 = false;
+                    readAgainForBranch2 = false;
+                    const chunk1 = chunk;
+                    let chunk2 = chunk;
+                    if (!canceled1 && !canceled2) {
+                        try {
+                            chunk2 = CloneAsUint8Array(chunk);
+                        }
+                        catch (cloneE) {
+                            ReadableByteStreamControllerError(branch1._readableStreamController, cloneE);
+                            ReadableByteStreamControllerError(branch2._readableStreamController, cloneE);
+                            resolveCancelPromise(ReadableStreamCancel(stream, cloneE));
+                            return;
+                        }
+                    }
+                    if (!canceled1) {
+                        ReadableByteStreamControllerEnqueue(branch1._readableStreamController, chunk1);
+                    }
+                    if (!canceled2) {
+                        ReadableByteStreamControllerEnqueue(branch2._readableStreamController, chunk2);
+                    }
+                    reading = false;
+                    if (readAgainForBranch1) {
+                        pull1Algorithm();
+                    }
+                    else if (readAgainForBranch2) {
+                        pull2Algorithm();
+                    }
+                });
+            },
+            _closeSteps: () => {
+                reading = false;
+                if (!canceled1) {
+                    ReadableByteStreamControllerClose(branch1._readableStreamController);
+                }
+                if (!canceled2) {
+                    ReadableByteStreamControllerClose(branch2._readableStreamController);
+                }
+                if (branch1._readableStreamController._pendingPullIntos.length > 0) {
+                    ReadableByteStreamControllerRespond(branch1._readableStreamController, 0);
+                }
+                if (branch2._readableStreamController._pendingPullIntos.length > 0) {
+                    ReadableByteStreamControllerRespond(branch2._readableStreamController, 0);
+                }
+                if (!canceled1 || !canceled2) {
+                    resolveCancelPromise(undefined);
+                }
+            },
+            _errorSteps: () => {
+                reading = false;
+            }
+        };
+        ReadableStreamDefaultReaderRead(reader, readRequest);
+    }
+    function pullWithBYOBReader(view, forBranch2) {
+        if (IsReadableStreamDefaultReader(reader)) {
+            ReadableStreamReaderGenericRelease(reader);
+            reader = AcquireReadableStreamBYOBReader(stream);
+            forwardReaderError(reader);
+        }
+        const byobBranch = forBranch2 ? branch2 : branch1;
+        const otherBranch = forBranch2 ? branch1 : branch2;
+        const readIntoRequest = {
+            _chunkSteps: chunk => {
+                // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                // successful synchronously-available reads get ahead of asynchronously-available errors.
+                queueMicrotask(() => {
+                    readAgainForBranch1 = false;
+                    readAgainForBranch2 = false;
+                    const byobCanceled = forBranch2 ? canceled2 : canceled1;
+                    const otherCanceled = forBranch2 ? canceled1 : canceled2;
+                    if (!otherCanceled) {
+                        let clonedChunk;
+                        try {
+                            clonedChunk = CloneAsUint8Array(chunk);
+                        }
+                        catch (cloneE) {
+                            ReadableByteStreamControllerError(byobBranch._readableStreamController, cloneE);
+                            ReadableByteStreamControllerError(otherBranch._readableStreamController, cloneE);
+                            resolveCancelPromise(ReadableStreamCancel(stream, cloneE));
+                            return;
+                        }
+                        if (!byobCanceled) {
+                            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                        }
+                        ReadableByteStreamControllerEnqueue(otherBranch._readableStreamController, clonedChunk);
+                    }
+                    else if (!byobCanceled) {
+                        ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                    }
+                    reading = false;
+                    if (readAgainForBranch1) {
+                        pull1Algorithm();
+                    }
+                    else if (readAgainForBranch2) {
+                        pull2Algorithm();
+                    }
+                });
+            },
+            _closeSteps: chunk => {
+                reading = false;
+                const byobCanceled = forBranch2 ? canceled2 : canceled1;
+                const otherCanceled = forBranch2 ? canceled1 : canceled2;
+                if (!byobCanceled) {
+                    ReadableByteStreamControllerClose(byobBranch._readableStreamController);
+                }
+                if (!otherCanceled) {
+                    ReadableByteStreamControllerClose(otherBranch._readableStreamController);
+                }
+                if (chunk !== undefined) {
+                    if (!byobCanceled) {
+                        ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                    }
+                    if (!otherCanceled && otherBranch._readableStreamController._pendingPullIntos.length > 0) {
+                        ReadableByteStreamControllerRespond(otherBranch._readableStreamController, 0);
+                    }
+                }
+                if (!byobCanceled || !otherCanceled) {
+                    resolveCancelPromise(undefined);
+                }
+            },
+            _errorSteps: () => {
+                reading = false;
+            }
+        };
+        ReadableStreamBYOBReaderRead(reader, view, readIntoRequest);
+    }
+    function pull1Algorithm() {
+        if (reading) {
+            readAgainForBranch1 = true;
+            return promiseResolvedWith(undefined);
+        }
+        reading = true;
+        const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch1._readableStreamController);
+        if (byobRequest === null) {
+            pullWithDefaultReader();
+        }
+        else {
+            pullWithBYOBReader(byobRequest._view, false);
+        }
+        return promiseResolvedWith(undefined);
+    }
+    function pull2Algorithm() {
+        if (reading) {
+            readAgainForBranch2 = true;
+            return promiseResolvedWith(undefined);
+        }
+        reading = true;
+        const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch2._readableStreamController);
+        if (byobRequest === null) {
+            pullWithDefaultReader();
+        }
+        else {
+            pullWithBYOBReader(byobRequest._view, true);
+        }
+        return promiseResolvedWith(undefined);
+    }
+    function cancel1Algorithm(reason) {
+        canceled1 = true;
+        reason1 = reason;
+        if (canceled2) {
+            const compositeReason = CreateArrayFromList([reason1, reason2]);
+            const cancelResult = ReadableStreamCancel(stream, compositeReason);
+            resolveCancelPromise(cancelResult);
+        }
+        return cancelPromise;
+    }
+    function cancel2Algorithm(reason) {
+        canceled2 = true;
+        reason2 = reason;
+        if (canceled1) {
+            const compositeReason = CreateArrayFromList([reason1, reason2]);
+            const cancelResult = ReadableStreamCancel(stream, compositeReason);
+            resolveCancelPromise(cancelResult);
+        }
+        return cancelPromise;
+    }
+    function startAlgorithm() {
+        return;
+    }
+    branch1 = CreateReadableByteStream(startAlgorithm, pull1Algorithm, cancel1Algorithm);
+    branch2 = CreateReadableByteStream(startAlgorithm, pull2Algorithm, cancel2Algorithm);
+    forwardReaderError(reader);
+    return [branch1, branch2];
+}
+
+function convertUnderlyingDefaultOrByteSource(source, context) {
+    assertDictionary(source, context);
+    const original = source;
+    const autoAllocateChunkSize = original === null || original === void 0 ? void 0 : original.autoAllocateChunkSize;
+    const cancel = original === null || original === void 0 ? void 0 : original.cancel;
+    const pull = original === null || original === void 0 ? void 0 : original.pull;
+    const start = original === null || original === void 0 ? void 0 : original.start;
+    const type = original === null || original === void 0 ? void 0 : original.type;
+    return {
+        autoAllocateChunkSize: autoAllocateChunkSize === undefined ?
+            undefined :
+            convertUnsignedLongLongWithEnforceRange(autoAllocateChunkSize, `${context} has member 'autoAllocateChunkSize' that`),
+        cancel: cancel === undefined ?
+            undefined :
+            convertUnderlyingSourceCancelCallback(cancel, original, `${context} has member 'cancel' that`),
+        pull: pull === undefined ?
+            undefined :
+            convertUnderlyingSourcePullCallback(pull, original, `${context} has member 'pull' that`),
+        start: start === undefined ?
+            undefined :
+            convertUnderlyingSourceStartCallback(start, original, `${context} has member 'start' that`),
+        type: type === undefined ? undefined : convertReadableStreamType(type, `${context} has member 'type' that`)
+    };
+}
+function convertUnderlyingSourceCancelCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (reason) => promiseCall(fn, original, [reason]);
+}
+function convertUnderlyingSourcePullCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (controller) => promiseCall(fn, original, [controller]);
+}
+function convertUnderlyingSourceStartCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (controller) => reflectCall(fn, original, [controller]);
+}
+function convertReadableStreamType(type, context) {
+    type = `${type}`;
+    if (type !== 'bytes') {
+        throw new TypeError(`${context} '${type}' is not a valid enumeration value for ReadableStreamType`);
+    }
+    return type;
+}
+
+function convertReaderOptions(options, context) {
+    assertDictionary(options, context);
+    const mode = options === null || options === void 0 ? void 0 : options.mode;
+    return {
+        mode: mode === undefined ? undefined : convertReadableStreamReaderMode(mode, `${context} has member 'mode' that`)
+    };
+}
+function convertReadableStreamReaderMode(mode, context) {
+    mode = `${mode}`;
+    if (mode !== 'byob') {
+        throw new TypeError(`${context} '${mode}' is not a valid enumeration value for ReadableStreamReaderMode`);
+    }
+    return mode;
+}
+
+function convertIteratorOptions(options, context) {
+    assertDictionary(options, context);
+    const preventCancel = options === null || options === void 0 ? void 0 : options.preventCancel;
+    return { preventCancel: Boolean(preventCancel) };
+}
+
+function convertPipeOptions(options, context) {
+    assertDictionary(options, context);
+    const preventAbort = options === null || options === void 0 ? void 0 : options.preventAbort;
+    const preventCancel = options === null || options === void 0 ? void 0 : options.preventCancel;
+    const preventClose = options === null || options === void 0 ? void 0 : options.preventClose;
+    const signal = options === null || options === void 0 ? void 0 : options.signal;
+    if (signal !== undefined) {
+        assertAbortSignal(signal, `${context} has member 'signal' that`);
+    }
+    return {
+        preventAbort: Boolean(preventAbort),
+        preventCancel: Boolean(preventCancel),
+        preventClose: Boolean(preventClose),
+        signal
+    };
+}
+function assertAbortSignal(signal, context) {
+    if (!isAbortSignal(signal)) {
+        throw new TypeError(`${context} is not an AbortSignal.`);
+    }
+}
+
+function convertReadableWritablePair(pair, context) {
+    assertDictionary(pair, context);
+    const readable = pair === null || pair === void 0 ? void 0 : pair.readable;
+    assertRequiredField(readable, 'readable', 'ReadableWritablePair');
+    assertReadableStream(readable, `${context} has member 'readable' that`);
+    const writable = pair === null || pair === void 0 ? void 0 : pair.writable;
+    assertRequiredField(writable, 'writable', 'ReadableWritablePair');
+    assertWritableStream(writable, `${context} has member 'writable' that`);
+    return { readable, writable };
+}
+
+/**
+ * A readable stream represents a source of data, from which you can read.
+ *
+ * @public
+ */
+class ReadableStream {
+    constructor(rawUnderlyingSource = {}, rawStrategy = {}) {
+        if (rawUnderlyingSource === undefined) {
+            rawUnderlyingSource = null;
+        }
+        else {
+            assertObject(rawUnderlyingSource, 'First parameter');
+        }
+        const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');
+        const underlyingSource = convertUnderlyingDefaultOrByteSource(rawUnderlyingSource, 'First parameter');
+        InitializeReadableStream(this);
+        if (underlyingSource.type === 'bytes') {
+            if (strategy.size !== undefined) {
+                throw new RangeError('The strategy for a byte stream cannot have a size function');
+            }
+            const highWaterMark = ExtractHighWaterMark(strategy, 0);
+            SetUpReadableByteStreamControllerFromUnderlyingSource(this, underlyingSource, highWaterMark);
+        }
+        else {
+            const sizeAlgorithm = ExtractSizeAlgorithm(strategy);
+            const highWaterMark = ExtractHighWaterMark(strategy, 1);
+            SetUpReadableStreamDefaultControllerFromUnderlyingSource(this, underlyingSource, highWaterMark, sizeAlgorithm);
+        }
+    }
+    /**
+     * Whether or not the readable stream is locked to a {@link ReadableStreamDefaultReader | reader}.
+     */
+    get locked() {
+        if (!IsReadableStream(this)) {
+            throw streamBrandCheckException$1('locked');
+        }
+        return IsReadableStreamLocked(this);
+    }
+    /**
+     * Cancels the stream, signaling a loss of interest in the stream by a consumer.
+     *
+     * The supplied `reason` argument will be given to the underlying source's {@link UnderlyingSource.cancel | cancel()}
+     * method, which might or might not use it.
+     */
+    cancel(reason = undefined) {
+        if (!IsReadableStream(this)) {
+            return promiseRejectedWith(streamBrandCheckException$1('cancel'));
+        }
+        if (IsReadableStreamLocked(this)) {
+            return promiseRejectedWith(new TypeError('Cannot cancel a stream that already has a reader'));
+        }
+        return ReadableStreamCancel(this, reason);
+    }
+    getReader(rawOptions = undefined) {
+        if (!IsReadableStream(this)) {
+            throw streamBrandCheckException$1('getReader');
+        }
+        const options = convertReaderOptions(rawOptions, 'First parameter');
+        if (options.mode === undefined) {
+            return AcquireReadableStreamDefaultReader(this);
+        }
+        return AcquireReadableStreamBYOBReader(this);
+    }
+    pipeThrough(rawTransform, rawOptions = {}) {
+        if (!IsReadableStream(this)) {
+            throw streamBrandCheckException$1('pipeThrough');
+        }
+        assertRequiredArgument(rawTransform, 1, 'pipeThrough');
+        const transform = convertReadableWritablePair(rawTransform, 'First parameter');
+        const options = convertPipeOptions(rawOptions, 'Second parameter');
+        if (IsReadableStreamLocked(this)) {
+            throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked ReadableStream');
+        }
+        if (IsWritableStreamLocked(transform.writable)) {
+            throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked WritableStream');
+        }
+        const promise = ReadableStreamPipeTo(this, transform.writable, options.preventClose, options.preventAbort, options.preventCancel, options.signal);
+        setPromiseIsHandledToTrue(promise);
+        return transform.readable;
+    }
+    pipeTo(destination, rawOptions = {}) {
+        if (!IsReadableStream(this)) {
+            return promiseRejectedWith(streamBrandCheckException$1('pipeTo'));
+        }
+        if (destination === undefined) {
+            return promiseRejectedWith(`Parameter 1 is required in 'pipeTo'.`);
+        }
+        if (!IsWritableStream(destination)) {
+            return promiseRejectedWith(new TypeError(`ReadableStream.prototype.pipeTo's first argument must be a WritableStream`));
+        }
+        let options;
+        try {
+            options = convertPipeOptions(rawOptions, 'Second parameter');
+        }
+        catch (e) {
+            return promiseRejectedWith(e);
+        }
+        if (IsReadableStreamLocked(this)) {
+            return promiseRejectedWith(new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream'));
+        }
+        if (IsWritableStreamLocked(destination)) {
+            return promiseRejectedWith(new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream'));
+        }
+        return ReadableStreamPipeTo(this, destination, options.preventClose, options.preventAbort, options.preventCancel, options.signal);
+    }
+    /**
+     * Tees this readable stream, returning a two-element array containing the two resulting branches as
+     * new {@link ReadableStream} instances.
+     *
+     * Teeing a stream will lock it, preventing any other consumer from acquiring a reader.
+     * To cancel the stream, cancel both of the resulting branches; a composite cancellation reason will then be
+     * propagated to the stream's underlying source.
+     *
+     * Note that the chunks seen in each branch will be the same object. If the chunks are not immutable,
+     * this could allow interference between the two branches.
+     */
+    tee() {
+        if (!IsReadableStream(this)) {
+            throw streamBrandCheckException$1('tee');
+        }
+        const branches = ReadableStreamTee(this);
+        return CreateArrayFromList(branches);
+    }
+    values(rawOptions = undefined) {
+        if (!IsReadableStream(this)) {
+            throw streamBrandCheckException$1('values');
+        }
+        const options = convertIteratorOptions(rawOptions, 'First parameter');
+        return AcquireReadableStreamAsyncIterator(this, options.preventCancel);
+    }
+}
+Object.defineProperties(ReadableStream.prototype, {
+    cancel: { enumerable: true },
+    getReader: { enumerable: true },
+    pipeThrough: { enumerable: true },
+    pipeTo: { enumerable: true },
+    tee: { enumerable: true },
+    values: { enumerable: true },
+    locked: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableStream.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableStream',
+        configurable: true
+    });
+}
+if (typeof SymbolPolyfill.asyncIterator === 'symbol') {
+    Object.defineProperty(ReadableStream.prototype, SymbolPolyfill.asyncIterator, {
+        value: ReadableStream.prototype.values,
+        writable: true,
+        configurable: true
+    });
+}
+// Abstract operations for the ReadableStream.
+// Throws if and only if startAlgorithm throws.
+function CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark = 1, sizeAlgorithm = () => 1) {
+    const stream = Object.create(ReadableStream.prototype);
+    InitializeReadableStream(stream);
+    const controller = Object.create(ReadableStreamDefaultController.prototype);
+    SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm);
+    return stream;
+}
+// Throws if and only if startAlgorithm throws.
+function CreateReadableByteStream(startAlgorithm, pullAlgorithm, cancelAlgorithm) {
+    const stream = Object.create(ReadableStream.prototype);
+    InitializeReadableStream(stream);
+    const controller = Object.create(ReadableByteStreamController.prototype);
+    SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, 0, undefined);
+    return stream;
+}
+function InitializeReadableStream(stream) {
+    stream._state = 'readable';
+    stream._reader = undefined;
+    stream._storedError = undefined;
+    stream._disturbed = false;
+}
+function IsReadableStream(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_readableStreamController')) {
+        return false;
+    }
+    return x instanceof ReadableStream;
+}
+function IsReadableStreamLocked(stream) {
+    if (stream._reader === undefined) {
+        return false;
+    }
+    return true;
+}
+// ReadableStream API exposed for controllers.
+function ReadableStreamCancel(stream, reason) {
+    stream._disturbed = true;
+    if (stream._state === 'closed') {
+        return promiseResolvedWith(undefined);
+    }
+    if (stream._state === 'errored') {
+        return promiseRejectedWith(stream._storedError);
+    }
+    ReadableStreamClose(stream);
+    const reader = stream._reader;
+    if (reader !== undefined && IsReadableStreamBYOBReader(reader)) {
+        reader._readIntoRequests.forEach(readIntoRequest => {
+            readIntoRequest._closeSteps(undefined);
+        });
+        reader._readIntoRequests = new SimpleQueue();
+    }
+    const sourceCancelPromise = stream._readableStreamController[CancelSteps](reason);
+    return transformPromiseWith(sourceCancelPromise, noop);
+}
+function ReadableStreamClose(stream) {
+    stream._state = 'closed';
+    const reader = stream._reader;
+    if (reader === undefined) {
+        return;
+    }
+    defaultReaderClosedPromiseResolve(reader);
+    if (IsReadableStreamDefaultReader(reader)) {
+        reader._readRequests.forEach(readRequest => {
+            readRequest._closeSteps();
+        });
+        reader._readRequests = new SimpleQueue();
+    }
+}
+function ReadableStreamError(stream, e) {
+    stream._state = 'errored';
+    stream._storedError = e;
+    const reader = stream._reader;
+    if (reader === undefined) {
+        return;
+    }
+    defaultReaderClosedPromiseReject(reader, e);
+    if (IsReadableStreamDefaultReader(reader)) {
+        reader._readRequests.forEach(readRequest => {
+            readRequest._errorSteps(e);
+        });
+        reader._readRequests = new SimpleQueue();
+    }
+    else {
+        reader._readIntoRequests.forEach(readIntoRequest => {
+            readIntoRequest._errorSteps(e);
+        });
+        reader._readIntoRequests = new SimpleQueue();
+    }
+}
+// Helper functions for the ReadableStream.
+function streamBrandCheckException$1(name) {
+    return new TypeError(`ReadableStream.prototype.${name} can only be used on a ReadableStream`);
+}
+
+function convertQueuingStrategyInit(init, context) {
+    assertDictionary(init, context);
+    const highWaterMark = init === null || init === void 0 ? void 0 : init.highWaterMark;
+    assertRequiredField(highWaterMark, 'highWaterMark', 'QueuingStrategyInit');
+    return {
+        highWaterMark: convertUnrestrictedDouble(highWaterMark)
+    };
+}
+
+// The size function must not have a prototype property nor be a constructor
+const byteLengthSizeFunction = (chunk) => {
+    return chunk.byteLength;
+};
+try {
+    Object.defineProperty(byteLengthSizeFunction, 'name', {
+        value: 'size',
+        configurable: true
+    });
+}
+catch (_a) {
+    // This property is non-configurable in older browsers, so ignore if this throws.
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility
+}
+/**
+ * A queuing strategy that counts the number of bytes in each chunk.
+ *
+ * @public
+ */
+class ByteLengthQueuingStrategy {
+    constructor(options) {
+        assertRequiredArgument(options, 1, 'ByteLengthQueuingStrategy');
+        options = convertQueuingStrategyInit(options, 'First parameter');
+        this._byteLengthQueuingStrategyHighWaterMark = options.highWaterMark;
+    }
+    /**
+     * Returns the high water mark provided to the constructor.
+     */
+    get highWaterMark() {
+        if (!IsByteLengthQueuingStrategy(this)) {
+            throw byteLengthBrandCheckException('highWaterMark');
+        }
+        return this._byteLengthQueuingStrategyHighWaterMark;
+    }
+    /**
+     * Measures the size of `chunk` by returning the value of its `byteLength` property.
+     */
+    get size() {
+        if (!IsByteLengthQueuingStrategy(this)) {
+            throw byteLengthBrandCheckException('size');
+        }
+        return byteLengthSizeFunction;
+    }
+}
+Object.defineProperties(ByteLengthQueuingStrategy.prototype, {
+    highWaterMark: { enumerable: true },
+    size: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ByteLengthQueuingStrategy.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ByteLengthQueuingStrategy',
+        configurable: true
+    });
+}
+// Helper functions for the ByteLengthQueuingStrategy.
+function byteLengthBrandCheckException(name) {
+    return new TypeError(`ByteLengthQueuingStrategy.prototype.${name} can only be used on a ByteLengthQueuingStrategy`);
+}
+function IsByteLengthQueuingStrategy(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_byteLengthQueuingStrategyHighWaterMark')) {
+        return false;
+    }
+    return x instanceof ByteLengthQueuingStrategy;
+}
+
+// The size function must not have a prototype property nor be a constructor
+const countSizeFunction = () => {
+    return 1;
+};
+try {
+    Object.defineProperty(countSizeFunction, 'name', {
+        value: 'size',
+        configurable: true
+    });
+}
+catch (_a) {
+    // This property is non-configurable in older browsers, so ignore if this throws.
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility
+}
+/**
+ * A queuing strategy that counts the number of chunks.
+ *
+ * @public
+ */
+class CountQueuingStrategy {
+    constructor(options) {
+        assertRequiredArgument(options, 1, 'CountQueuingStrategy');
+        options = convertQueuingStrategyInit(options, 'First parameter');
+        this._countQueuingStrategyHighWaterMark = options.highWaterMark;
+    }
+    /**
+     * Returns the high water mark provided to the constructor.
+     */
+    get highWaterMark() {
+        if (!IsCountQueuingStrategy(this)) {
+            throw countBrandCheckException('highWaterMark');
+        }
+        return this._countQueuingStrategyHighWaterMark;
+    }
+    /**
+     * Measures the size of `chunk` by always returning 1.
+     * This ensures that the total queue size is a count of the number of chunks in the queue.
+     */
+    get size() {
+        if (!IsCountQueuingStrategy(this)) {
+            throw countBrandCheckException('size');
+        }
+        return countSizeFunction;
+    }
+}
+Object.defineProperties(CountQueuingStrategy.prototype, {
+    highWaterMark: { enumerable: true },
+    size: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(CountQueuingStrategy.prototype, SymbolPolyfill.toStringTag, {
+        value: 'CountQueuingStrategy',
+        configurable: true
+    });
+}
+// Helper functions for the CountQueuingStrategy.
+function countBrandCheckException(name) {
+    return new TypeError(`CountQueuingStrategy.prototype.${name} can only be used on a CountQueuingStrategy`);
+}
+function IsCountQueuingStrategy(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_countQueuingStrategyHighWaterMark')) {
+        return false;
+    }
+    return x instanceof CountQueuingStrategy;
+}
+
+function convertTransformer(original, context) {
+    assertDictionary(original, context);
+    const flush = original === null || original === void 0 ? void 0 : original.flush;
+    const readableType = original === null || original === void 0 ? void 0 : original.readableType;
+    const start = original === null || original === void 0 ? void 0 : original.start;
+    const transform = original === null || original === void 0 ? void 0 : original.transform;
+    const writableType = original === null || original === void 0 ? void 0 : original.writableType;
+    return {
+        flush: flush === undefined ?
+            undefined :
+            convertTransformerFlushCallback(flush, original, `${context} has member 'flush' that`),
+        readableType,
+        start: start === undefined ?
+            undefined :
+            convertTransformerStartCallback(start, original, `${context} has member 'start' that`),
+        transform: transform === undefined ?
+            undefined :
+            convertTransformerTransformCallback(transform, original, `${context} has member 'transform' that`),
+        writableType
+    };
+}
+function convertTransformerFlushCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (controller) => promiseCall(fn, original, [controller]);
+}
+function convertTransformerStartCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (controller) => reflectCall(fn, original, [controller]);
+}
+function convertTransformerTransformCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return (chunk, controller) => promiseCall(fn, original, [chunk, controller]);
+}
+
+// Class TransformStream
+/**
+ * A transform stream consists of a pair of streams: a {@link WritableStream | writable stream},
+ * known as its writable side, and a {@link ReadableStream | readable stream}, known as its readable side.
+ * In a manner specific to the transform stream in question, writes to the writable side result in new data being
+ * made available for reading from the readable side.
+ *
+ * @public
+ */
+class TransformStream {
+    constructor(rawTransformer = {}, rawWritableStrategy = {}, rawReadableStrategy = {}) {
+        if (rawTransformer === undefined) {
+            rawTransformer = null;
+        }
+        const writableStrategy = convertQueuingStrategy(rawWritableStrategy, 'Second parameter');
+        const readableStrategy = convertQueuingStrategy(rawReadableStrategy, 'Third parameter');
+        const transformer = convertTransformer(rawTransformer, 'First parameter');
+        if (transformer.readableType !== undefined) {
+            throw new RangeError('Invalid readableType specified');
+        }
+        if (transformer.writableType !== undefined) {
+            throw new RangeError('Invalid writableType specified');
+        }
+        const readableHighWaterMark = ExtractHighWaterMark(readableStrategy, 0);
+        const readableSizeAlgorithm = ExtractSizeAlgorithm(readableStrategy);
+        const writableHighWaterMark = ExtractHighWaterMark(writableStrategy, 1);
+        const writableSizeAlgorithm = ExtractSizeAlgorithm(writableStrategy);
+        let startPromise_resolve;
+        const startPromise = newPromise(resolve => {
+            startPromise_resolve = resolve;
+        });
+        InitializeTransformStream(this, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm);
+        SetUpTransformStreamDefaultControllerFromTransformer(this, transformer);
+        if (transformer.start !== undefined) {
+            startPromise_resolve(transformer.start(this._transformStreamController));
+        }
+        else {
+            startPromise_resolve(undefined);
+        }
+    }
+    /**
+     * The readable side of the transform stream.
+     */
+    get readable() {
+        if (!IsTransformStream(this)) {
+            throw streamBrandCheckException('readable');
+        }
+        return this._readable;
+    }
+    /**
+     * The writable side of the transform stream.
+     */
+    get writable() {
+        if (!IsTransformStream(this)) {
+            throw streamBrandCheckException('writable');
+        }
+        return this._writable;
+    }
+}
+Object.defineProperties(TransformStream.prototype, {
+    readable: { enumerable: true },
+    writable: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(TransformStream.prototype, SymbolPolyfill.toStringTag, {
+        value: 'TransformStream',
+        configurable: true
+    });
+}
+function InitializeTransformStream(stream, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm) {
+    function startAlgorithm() {
+        return startPromise;
+    }
+    function writeAlgorithm(chunk) {
+        return TransformStreamDefaultSinkWriteAlgorithm(stream, chunk);
+    }
+    function abortAlgorithm(reason) {
+        return TransformStreamDefaultSinkAbortAlgorithm(stream, reason);
+    }
+    function closeAlgorithm() {
+        return TransformStreamDefaultSinkCloseAlgorithm(stream);
+    }
+    stream._writable = CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, writableHighWaterMark, writableSizeAlgorithm);
+    function pullAlgorithm() {
+        return TransformStreamDefaultSourcePullAlgorithm(stream);
+    }
+    function cancelAlgorithm(reason) {
+        TransformStreamErrorWritableAndUnblockWrite(stream, reason);
+        return promiseResolvedWith(undefined);
+    }
+    stream._readable = CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, readableHighWaterMark, readableSizeAlgorithm);
+    // The [[backpressure]] slot is set to undefined so that it can be initialised by TransformStreamSetBackpressure.
+    stream._backpressure = undefined;
+    stream._backpressureChangePromise = undefined;
+    stream._backpressureChangePromise_resolve = undefined;
+    TransformStreamSetBackpressure(stream, true);
+    stream._transformStreamController = undefined;
+}
+function IsTransformStream(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_transformStreamController')) {
+        return false;
+    }
+    return x instanceof TransformStream;
+}
+// This is a no-op if both sides are already errored.
+function TransformStreamError(stream, e) {
+    ReadableStreamDefaultControllerError(stream._readable._readableStreamController, e);
+    TransformStreamErrorWritableAndUnblockWrite(stream, e);
+}
+function TransformStreamErrorWritableAndUnblockWrite(stream, e) {
+    TransformStreamDefaultControllerClearAlgorithms(stream._transformStreamController);
+    WritableStreamDefaultControllerErrorIfNeeded(stream._writable._writableStreamController, e);
+    if (stream._backpressure) {
+        // Pretend that pull() was called to permit any pending write() calls to complete. TransformStreamSetBackpressure()
+        // cannot be called from enqueue() or pull() once the ReadableStream is errored, so this will will be the final time
+        // _backpressure is set.
+        TransformStreamSetBackpressure(stream, false);
+    }
+}
+function TransformStreamSetBackpressure(stream, backpressure) {
+    // Passes also when called during construction.
+    if (stream._backpressureChangePromise !== undefined) {
+        stream._backpressureChangePromise_resolve();
+    }
+    stream._backpressureChangePromise = newPromise(resolve => {
+        stream._backpressureChangePromise_resolve = resolve;
+    });
+    stream._backpressure = backpressure;
+}
+// Class TransformStreamDefaultController
+/**
+ * Allows control of the {@link ReadableStream} and {@link WritableStream} of the associated {@link TransformStream}.
+ *
+ * @public
+ */
+class TransformStreamDefaultController {
+    constructor() {
+        throw new TypeError('Illegal constructor');
+    }
+    /**
+     * Returns the desired size to fill the readable side’s internal queue. It can be negative, if the queue is over-full.
+     */
+    get desiredSize() {
+        if (!IsTransformStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException('desiredSize');
+        }
+        const readableController = this._controlledTransformStream._readable._readableStreamController;
+        return ReadableStreamDefaultControllerGetDesiredSize(readableController);
+    }
+    enqueue(chunk = undefined) {
+        if (!IsTransformStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException('enqueue');
+        }
+        TransformStreamDefaultControllerEnqueue(this, chunk);
+    }
+    /**
+     * Errors both the readable side and the writable side of the controlled transform stream, making all future
+     * interactions with it fail with the given error `e`. Any chunks queued for transformation will be discarded.
+     */
+    error(reason = undefined) {
+        if (!IsTransformStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException('error');
+        }
+        TransformStreamDefaultControllerError(this, reason);
+    }
+    /**
+     * Closes the readable side and errors the writable side of the controlled transform stream. This is useful when the
+     * transformer only needs to consume a portion of the chunks written to the writable side.
+     */
+    terminate() {
+        if (!IsTransformStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException('terminate');
+        }
+        TransformStreamDefaultControllerTerminate(this);
+    }
+}
+Object.defineProperties(TransformStreamDefaultController.prototype, {
+    enqueue: { enumerable: true },
+    error: { enumerable: true },
+    terminate: { enumerable: true },
+    desiredSize: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(TransformStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+        value: 'TransformStreamDefaultController',
+        configurable: true
+    });
+}
+// Transform Stream Default Controller Abstract Operations
+function IsTransformStreamDefaultController(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_controlledTransformStream')) {
+        return false;
+    }
+    return x instanceof TransformStreamDefaultController;
+}
+function SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm) {
+    controller._controlledTransformStream = stream;
+    stream._transformStreamController = controller;
+    controller._transformAlgorithm = transformAlgorithm;
+    controller._flushAlgorithm = flushAlgorithm;
+}
+function SetUpTransformStreamDefaultControllerFromTransformer(stream, transformer) {
+    const controller = Object.create(TransformStreamDefaultController.prototype);
+    let transformAlgorithm = (chunk) => {
+        try {
+            TransformStreamDefaultControllerEnqueue(controller, chunk);
+            return promiseResolvedWith(undefined);
+        }
+        catch (transformResultE) {
+            return promiseRejectedWith(transformResultE);
+        }
+    };
+    let flushAlgorithm = () => promiseResolvedWith(undefined);
+    if (transformer.transform !== undefined) {
+        transformAlgorithm = chunk => transformer.transform(chunk, controller);
+    }
+    if (transformer.flush !== undefined) {
+        flushAlgorithm = () => transformer.flush(controller);
+    }
+    SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);
+}
+function TransformStreamDefaultControllerClearAlgorithms(controller) {
+    controller._transformAlgorithm = undefined;
+    controller._flushAlgorithm = undefined;
+}
+function TransformStreamDefaultControllerEnqueue(controller, chunk) {
+    const stream = controller._controlledTransformStream;
+    const readableController = stream._readable._readableStreamController;
+    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(readableController)) {
+        throw new TypeError('Readable side is not in a state that permits enqueue');
+    }
+    // We throttle transform invocations based on the backpressure of the ReadableStream, but we still
+    // accept TransformStreamDefaultControllerEnqueue() calls.
+    try {
+        ReadableStreamDefaultControllerEnqueue(readableController, chunk);
+    }
+    catch (e) {
+        // This happens when readableStrategy.size() throws.
+        TransformStreamErrorWritableAndUnblockWrite(stream, e);
+        throw stream._readable._storedError;
+    }
+    const backpressure = ReadableStreamDefaultControllerHasBackpressure(readableController);
+    if (backpressure !== stream._backpressure) {
+        TransformStreamSetBackpressure(stream, true);
+    }
+}
+function TransformStreamDefaultControllerError(controller, e) {
+    TransformStreamError(controller._controlledTransformStream, e);
+}
+function TransformStreamDefaultControllerPerformTransform(controller, chunk) {
+    const transformPromise = controller._transformAlgorithm(chunk);
+    return transformPromiseWith(transformPromise, undefined, r => {
+        TransformStreamError(controller._controlledTransformStream, r);
+        throw r;
+    });
+}
+function TransformStreamDefaultControllerTerminate(controller) {
+    const stream = controller._controlledTransformStream;
+    const readableController = stream._readable._readableStreamController;
+    ReadableStreamDefaultControllerClose(readableController);
+    const error = new TypeError('TransformStream terminated');
+    TransformStreamErrorWritableAndUnblockWrite(stream, error);
+}
+// TransformStreamDefaultSink Algorithms
+function TransformStreamDefaultSinkWriteAlgorithm(stream, chunk) {
+    const controller = stream._transformStreamController;
+    if (stream._backpressure) {
+        const backpressureChangePromise = stream._backpressureChangePromise;
+        return transformPromiseWith(backpressureChangePromise, () => {
+            const writable = stream._writable;
+            const state = writable._state;
+            if (state === 'erroring') {
+                throw writable._storedError;
+            }
+            return TransformStreamDefaultControllerPerformTransform(controller, chunk);
+        });
+    }
+    return TransformStreamDefaultControllerPerformTransform(controller, chunk);
+}
+function TransformStreamDefaultSinkAbortAlgorithm(stream, reason) {
+    // abort() is not called synchronously, so it is possible for abort() to be called when the stream is already
+    // errored.
+    TransformStreamError(stream, reason);
+    return promiseResolvedWith(undefined);
+}
+function TransformStreamDefaultSinkCloseAlgorithm(stream) {
+    // stream._readable cannot change after construction, so caching it across a call to user code is safe.
+    const readable = stream._readable;
+    const controller = stream._transformStreamController;
+    const flushPromise = controller._flushAlgorithm();
+    TransformStreamDefaultControllerClearAlgorithms(controller);
+    // Return a promise that is fulfilled with undefined on success.
+    return transformPromiseWith(flushPromise, () => {
+        if (readable._state === 'errored') {
+            throw readable._storedError;
+        }
+        ReadableStreamDefaultControllerClose(readable._readableStreamController);
+    }, r => {
+        TransformStreamError(stream, r);
+        throw readable._storedError;
+    });
+}
+// TransformStreamDefaultSource Algorithms
+function TransformStreamDefaultSourcePullAlgorithm(stream) {
+    // Invariant. Enforced by the promises returned by start() and pull().
+    TransformStreamSetBackpressure(stream, false);
+    // Prevent the next pull() call until there is backpressure.
+    return stream._backpressureChangePromise;
+}
+// Helper functions for the TransformStreamDefaultController.
+function defaultControllerBrandCheckException(name) {
+    return new TypeError(`TransformStreamDefaultController.prototype.${name} can only be used on a TransformStreamDefaultController`);
+}
+// Helper functions for the TransformStream.
+function streamBrandCheckException(name) {
+    return new TypeError(`TransformStream.prototype.${name} can only be used on a TransformStream`);
+}
+
+export { ByteLengthQueuingStrategy, CountQueuingStrategy, ReadableByteStreamController, ReadableStream, ReadableStreamBYOBReader, ReadableStreamBYOBRequest, ReadableStreamDefaultController, ReadableStreamDefaultReader, TransformStream, TransformStreamDefaultController, WritableStream, WritableStreamDefaultController, WritableStreamDefaultWriter };
+//# sourceMappingURL=ponyfill.es6.mjs.map
diff --git a/node_modules/web-streams-polyfill/dist/ponyfill.es6.mjs.map b/node_modules/web-streams-polyfill/dist/ponyfill.es6.mjs.map
new file mode 100644
index 0000000..fd8b762
--- /dev/null
+++ b/node_modules/web-streams-polyfill/dist/ponyfill.es6.mjs.map
@@ -0,0 +1 @@
+{"version":3,"file":"ponyfill.es6.mjs","sources":["../src/stub/symbol.ts","../src/utils.ts","../src/lib/helpers/miscellaneous.ts","../src/lib/helpers/webidl.ts","../src/lib/simple-queue.ts","../src/lib/readable-stream/generic-reader.ts","../src/lib/abstract-ops/internal-methods.ts","../src/stub/number-isfinite.ts","../src/stub/math-trunc.ts","../src/lib/validators/basic.ts","../src/lib/validators/readable-stream.ts","../src/lib/readable-stream/default-reader.ts","../src/target/es5/stub/async-iterator-prototype.ts","../src/lib/readable-stream/async-iterator.ts","../src/stub/number-isnan.ts","../src/lib/abstract-ops/ecmascript.ts","../src/lib/abstract-ops/miscellaneous.ts","../src/lib/abstract-ops/queue-with-sizes.ts","../src/lib/readable-stream/byte-stream-controller.ts","../src/lib/readable-stream/byob-reader.ts","../src/lib/abstract-ops/queuing-strategy.ts","../src/lib/validators/queuing-strategy.ts","../src/lib/validators/underlying-sink.ts","../src/lib/validators/writable-stream.ts","../src/lib/abort-signal.ts","../src/lib/writable-stream.ts","../src/stub/native.ts","../src/stub/dom-exception.ts","../src/lib/readable-stream/pipe.ts","../src/lib/readable-stream/default-controller.ts","../src/lib/readable-stream/tee.ts","../src/lib/validators/underlying-source.ts","../src/lib/validators/reader-options.ts","../src/lib/validators/iterator-options.ts","../src/lib/validators/pipe-options.ts","../src/lib/validators/readable-writable-pair.ts","../src/lib/readable-stream.ts","../src/lib/validators/queuing-strategy-init.ts","../src/lib/byte-length-queuing-strategy.ts","../src/lib/count-queuing-strategy.ts","../src/lib/validators/transformer.ts","../src/lib/transform-stream.ts"],"sourcesContent":["/// <reference lib=\"es2015.symbol\" />\n\nconst SymbolPolyfill: (description?: string) => symbol =\n  typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol' ?\n    Symbol :\n    description => `Symbol(${description})` as any as symbol;\n\nexport default SymbolPolyfill;\n","/// <reference lib=\"dom\" />\n\nexport function noop(): undefined {\n  return undefined;\n}\n\nfunction getGlobals() {\n  if (typeof self !== 'undefined') {\n    return self;\n  } else if (typeof window !== 'undefined') {\n    return window;\n  } else if (typeof global !== 'undefined') {\n    return global;\n  }\n  return undefined;\n}\n\nexport const globals = getGlobals();\n","import { noop } from '../../utils';\nimport { AssertionError } from '../../stub/assert';\n\nexport function typeIsObject(x: any): x is object {\n  return (typeof x === 'object' && x !== null) || typeof x === 'function';\n}\n\nexport const rethrowAssertionErrorRejection: (e: any) => void =\n  DEBUG ? e => {\n    // Used throughout the reference implementation, as `.catch(rethrowAssertionErrorRejection)`, to ensure any errors\n    // get shown. There are places in the spec where we do promise transformations and purposefully ignore or don't\n    // expect any errors, but assertion errors are always problematic.\n    if (e && e instanceof AssertionError) {\n      setTimeout(() => {\n        throw e;\n      }, 0);\n    }\n  } : noop;\n","import { globals } from '../../utils';\nimport { rethrowAssertionErrorRejection } from './miscellaneous';\nimport assert from '../../stub/assert';\n\nconst originalPromise = Promise;\nconst originalPromiseThen = Promise.prototype.then;\nconst originalPromiseResolve = Promise.resolve.bind(originalPromise);\nconst originalPromiseReject = Promise.reject.bind(originalPromise);\n\nexport function newPromise<T>(executor: (\n  resolve: (value: T | PromiseLike<T>) => void,\n  reject: (reason?: any) => void\n) => void): Promise<T> {\n  return new originalPromise(executor);\n}\n\nexport function promiseResolvedWith<T>(value: T | PromiseLike<T>): Promise<T> {\n  return originalPromiseResolve(value);\n}\n\nexport function promiseRejectedWith<T = never>(reason: any): Promise<T> {\n  return originalPromiseReject(reason);\n}\n\nexport function PerformPromiseThen<T, TResult1 = T, TResult2 = never>(\n  promise: Promise<T>,\n  onFulfilled?: (value: T) => TResult1 | PromiseLike<TResult1>,\n  onRejected?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2> {\n  // There doesn't appear to be any way to correctly emulate the behaviour from JavaScript, so this is just an\n  // approximation.\n  return originalPromiseThen.call(promise, onFulfilled, onRejected) as Promise<TResult1 | TResult2>;\n}\n\nexport function uponPromise<T>(\n  promise: Promise<T>,\n  onFulfilled?: (value: T) => void | PromiseLike<void>,\n  onRejected?: (reason: any) => void | PromiseLike<void>): void {\n  PerformPromiseThen(\n    PerformPromiseThen(promise, onFulfilled, onRejected),\n    undefined,\n    rethrowAssertionErrorRejection\n  );\n}\n\nexport function uponFulfillment<T>(promise: Promise<T>, onFulfilled: (value: T) => void | PromiseLike<void>): void {\n  uponPromise(promise, onFulfilled);\n}\n\nexport function uponRejection(promise: Promise<unknown>, onRejected: (reason: any) => void | PromiseLike<void>): void {\n  uponPromise(promise, undefined, onRejected);\n}\n\nexport function transformPromiseWith<T, TResult1 = T, TResult2 = never>(\n  promise: Promise<T>,\n  fulfillmentHandler?: (value: T) => TResult1 | PromiseLike<TResult1>,\n  rejectionHandler?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2> {\n  return PerformPromiseThen(promise, fulfillmentHandler, rejectionHandler);\n}\n\nexport function setPromiseIsHandledToTrue(promise: Promise<unknown>): void {\n  PerformPromiseThen(promise, undefined, rethrowAssertionErrorRejection);\n}\n\nexport const queueMicrotask: (fn: () => void) => void = (() => {\n  const globalQueueMicrotask = globals && globals.queueMicrotask;\n  if (typeof globalQueueMicrotask === 'function') {\n    return globalQueueMicrotask;\n  }\n\n  const resolvedPromise = promiseResolvedWith(undefined);\n  return (fn: () => void) => PerformPromiseThen(resolvedPromise, fn);\n})();\n\nexport function reflectCall<T, A extends any[], R>(F: (this: T, ...fnArgs: A) => R, V: T, args: A): R {\n  if (typeof F !== 'function') {\n    throw new TypeError('Argument is not a function');\n  }\n  return Function.prototype.apply.call(F, V, args);\n}\n\nexport function promiseCall<T, A extends any[], R>(F: (this: T, ...fnArgs: A) => R | PromiseLike<R>,\n                                                   V: T,\n                                                   args: A): Promise<R> {\n  assert(typeof F === 'function');\n  assert(V !== undefined);\n  assert(Array.isArray(args));\n  try {\n    return promiseResolvedWith(reflectCall(F, V, args));\n  } catch (value) {\n    return promiseRejectedWith(value);\n  }\n}\n","import assert from '../stub/assert';\n\n// Original from Chromium\n// https://chromium.googlesource.com/chromium/src/+/0aee4434a4dba42a42abaea9bfbc0cd196a63bc1/third_party/blink/renderer/core/streams/SimpleQueue.js\n\nconst QUEUE_MAX_ARRAY_SIZE = 16384;\n\ninterface Node<T> {\n  _elements: T[];\n  _next: Node<T> | undefined;\n}\n\n/**\n * Simple queue structure.\n *\n * Avoids scalability issues with using a packed array directly by using\n * multiple arrays in a linked list and keeping the array size bounded.\n */\nexport class SimpleQueue<T> {\n  private _front: Node<T>;\n  private _back: Node<T>;\n  private _cursor = 0;\n  private _size = 0;\n\n  constructor() {\n    // _front and _back are always defined.\n    this._front = {\n      _elements: [],\n      _next: undefined\n    };\n    this._back = this._front;\n    // The cursor is used to avoid calling Array.shift().\n    // It contains the index of the front element of the array inside the\n    // front-most node. It is always in the range [0, QUEUE_MAX_ARRAY_SIZE).\n    this._cursor = 0;\n    // When there is only one node, size === elements.length - cursor.\n    this._size = 0;\n  }\n\n  get length(): number {\n    return this._size;\n  }\n\n  // For exception safety, this method is structured in order:\n  // 1. Read state\n  // 2. Calculate required state mutations\n  // 3. Perform state mutations\n  push(element: T): void {\n    const oldBack = this._back;\n    let newBack = oldBack;\n    assert(oldBack._next === undefined);\n    if (oldBack._elements.length === QUEUE_MAX_ARRAY_SIZE - 1) {\n      newBack = {\n        _elements: [],\n        _next: undefined\n      };\n    }\n\n    // push() is the mutation most likely to throw an exception, so it\n    // goes first.\n    oldBack._elements.push(element);\n    if (newBack !== oldBack) {\n      this._back = newBack;\n      oldBack._next = newBack;\n    }\n    ++this._size;\n  }\n\n  // Like push(), shift() follows the read -> calculate -> mutate pattern for\n  // exception safety.\n  shift(): T {\n    assert(this._size > 0); // must not be called on an empty queue\n\n    const oldFront = this._front;\n    let newFront = oldFront;\n    const oldCursor = this._cursor;\n    let newCursor = oldCursor + 1;\n\n    const elements = oldFront._elements;\n    const element = elements[oldCursor];\n\n    if (newCursor === QUEUE_MAX_ARRAY_SIZE) {\n      assert(elements.length === QUEUE_MAX_ARRAY_SIZE);\n      assert(oldFront._next !== undefined);\n      newFront = oldFront._next!;\n      newCursor = 0;\n    }\n\n    // No mutations before this point.\n    --this._size;\n    this._cursor = newCursor;\n    if (oldFront !== newFront) {\n      this._front = newFront;\n    }\n\n    // Permit shifted element to be garbage collected.\n    elements[oldCursor] = undefined!;\n\n    return element;\n  }\n\n  // The tricky thing about forEach() is that it can be called\n  // re-entrantly. The queue may be mutated inside the callback. It is easy to\n  // see that push() within the callback has no negative effects since the end\n  // of the queue is checked for on every iteration. If shift() is called\n  // repeatedly within the callback then the next iteration may return an\n  // element that has been removed. In this case the callback will be called\n  // with undefined values until we either \"catch up\" with elements that still\n  // exist or reach the back of the queue.\n  forEach(callback: (element: T) => void): void {\n    let i = this._cursor;\n    let node = this._front;\n    let elements = node._elements;\n    while (i !== elements.length || node._next !== undefined) {\n      if (i === elements.length) {\n        assert(node._next !== undefined);\n        assert(i === QUEUE_MAX_ARRAY_SIZE);\n        node = node._next!;\n        elements = node._elements;\n        i = 0;\n        if (elements.length === 0) {\n          break;\n        }\n      }\n      callback(elements[i]);\n      ++i;\n    }\n  }\n\n  // Return the element that would be returned if shift() was called now,\n  // without modifying the queue.\n  peek(): T {\n    assert(this._size > 0); // must not be called on an empty queue\n\n    const front = this._front;\n    const cursor = this._cursor;\n    return front._elements[cursor];\n  }\n}\n","import assert from '../../stub/assert';\nimport { ReadableStream, ReadableStreamCancel, ReadableStreamReader } from '../readable-stream';\nimport { newPromise, setPromiseIsHandledToTrue } from '../helpers/webidl';\n\nexport function ReadableStreamReaderGenericInitialize<R>(reader: ReadableStreamReader<R>, stream: ReadableStream<R>) {\n  reader._ownerReadableStream = stream;\n  stream._reader = reader;\n\n  if (stream._state === 'readable') {\n    defaultReaderClosedPromiseInitialize(reader);\n  } else if (stream._state === 'closed') {\n    defaultReaderClosedPromiseInitializeAsResolved(reader);\n  } else {\n    assert(stream._state === 'errored');\n\n    defaultReaderClosedPromiseInitializeAsRejected(reader, stream._storedError);\n  }\n}\n\n// A client of ReadableStreamDefaultReader and ReadableStreamBYOBReader may use these functions directly to bypass state\n// check.\n\nexport function ReadableStreamReaderGenericCancel(reader: ReadableStreamReader<any>, reason: any): Promise<undefined> {\n  const stream = reader._ownerReadableStream;\n  assert(stream !== undefined);\n  return ReadableStreamCancel(stream, reason);\n}\n\nexport function ReadableStreamReaderGenericRelease(reader: ReadableStreamReader<any>) {\n  assert(reader._ownerReadableStream !== undefined);\n  assert(reader._ownerReadableStream._reader === reader);\n\n  if (reader._ownerReadableStream._state === 'readable') {\n    defaultReaderClosedPromiseReject(\n      reader,\n      new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));\n  } else {\n    defaultReaderClosedPromiseResetToRejected(\n      reader,\n      new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));\n  }\n\n  reader._ownerReadableStream._reader = undefined;\n  reader._ownerReadableStream = undefined!;\n}\n\n// Helper functions for the readers.\n\nexport function readerLockException(name: string): TypeError {\n  return new TypeError('Cannot ' + name + ' a stream using a released reader');\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nexport function defaultReaderClosedPromiseInitialize(reader: ReadableStreamReader<any>) {\n  reader._closedPromise = newPromise((resolve, reject) => {\n    reader._closedPromise_resolve = resolve;\n    reader._closedPromise_reject = reject;\n  });\n}\n\nexport function defaultReaderClosedPromiseInitializeAsRejected(reader: ReadableStreamReader<any>, reason: any) {\n  defaultReaderClosedPromiseInitialize(reader);\n  defaultReaderClosedPromiseReject(reader, reason);\n}\n\nexport function defaultReaderClosedPromiseInitializeAsResolved(reader: ReadableStreamReader<any>) {\n  defaultReaderClosedPromiseInitialize(reader);\n  defaultReaderClosedPromiseResolve(reader);\n}\n\nexport function defaultReaderClosedPromiseReject(reader: ReadableStreamReader<any>, reason: any) {\n  if (reader._closedPromise_reject === undefined) {\n    return;\n  }\n\n  setPromiseIsHandledToTrue(reader._closedPromise);\n  reader._closedPromise_reject(reason);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n\nexport function defaultReaderClosedPromiseResetToRejected(reader: ReadableStreamReader<any>, reason: any) {\n  assert(reader._closedPromise_resolve === undefined);\n  assert(reader._closedPromise_reject === undefined);\n\n  defaultReaderClosedPromiseInitializeAsRejected(reader, reason);\n}\n\nexport function defaultReaderClosedPromiseResolve(reader: ReadableStreamReader<any>) {\n  if (reader._closedPromise_resolve === undefined) {\n    return;\n  }\n\n  reader._closedPromise_resolve(undefined);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n","export const AbortSteps = Symbol('[[AbortSteps]]');\nexport const ErrorSteps = Symbol('[[ErrorSteps]]');\nexport const CancelSteps = Symbol('[[CancelSteps]]');\nexport const PullSteps = Symbol('[[PullSteps]]');\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite#Polyfill\nconst NumberIsFinite: typeof Number.isFinite = Number.isFinite || function (x) {\n  return typeof x === 'number' && isFinite(x);\n};\n\nexport default NumberIsFinite;\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc#Polyfill\nconst MathTrunc: typeof Math.trunc = Math.trunc || function (v) {\n  return v < 0 ? Math.ceil(v) : Math.floor(v);\n};\n\nexport default MathTrunc;\n","import NumberIsFinite from '../../stub/number-isfinite';\nimport MathTrunc from '../../stub/math-trunc';\n\n// https://heycam.github.io/webidl/#idl-dictionaries\nexport function isDictionary(x: any): x is object | null {\n  return typeof x === 'object' || typeof x === 'function';\n}\n\nexport function assertDictionary(obj: unknown,\n                                 context: string): asserts obj is object | null | undefined {\n  if (obj !== undefined && !isDictionary(obj)) {\n    throw new TypeError(`${context} is not an object.`);\n  }\n}\n\nexport type AnyFunction = (...args: any[]) => any;\n\n// https://heycam.github.io/webidl/#idl-callback-functions\nexport function assertFunction(x: unknown, context: string): asserts x is AnyFunction {\n  if (typeof x !== 'function') {\n    throw new TypeError(`${context} is not a function.`);\n  }\n}\n\n// https://heycam.github.io/webidl/#idl-object\nexport function isObject(x: any): x is object {\n  return (typeof x === 'object' && x !== null) || typeof x === 'function';\n}\n\nexport function assertObject(x: unknown,\n                             context: string): asserts x is object {\n  if (!isObject(x)) {\n    throw new TypeError(`${context} is not an object.`);\n  }\n}\n\nexport function assertRequiredArgument<T extends any>(x: T | undefined,\n                                                      position: number,\n                                                      context: string): asserts x is T {\n  if (x === undefined) {\n    throw new TypeError(`Parameter ${position} is required in '${context}'.`);\n  }\n}\n\nexport function assertRequiredField<T extends any>(x: T | undefined,\n                                                   field: string,\n                                                   context: string): asserts x is T {\n  if (x === undefined) {\n    throw new TypeError(`${field} is required in '${context}'.`);\n  }\n}\n\n// https://heycam.github.io/webidl/#idl-unrestricted-double\nexport function convertUnrestrictedDouble(value: unknown): number {\n  return Number(value);\n}\n\nfunction censorNegativeZero(x: number): number {\n  return x === 0 ? 0 : x;\n}\n\nfunction integerPart(x: number): number {\n  return censorNegativeZero(MathTrunc(x));\n}\n\n// https://heycam.github.io/webidl/#idl-unsigned-long-long\nexport function convertUnsignedLongLongWithEnforceRange(value: unknown, context: string): number {\n  const lowerBound = 0;\n  const upperBound = Number.MAX_SAFE_INTEGER;\n\n  let x = Number(value);\n  x = censorNegativeZero(x);\n\n  if (!NumberIsFinite(x)) {\n    throw new TypeError(`${context} is not a finite number`);\n  }\n\n  x = integerPart(x);\n\n  if (x < lowerBound || x > upperBound) {\n    throw new TypeError(`${context} is outside the accepted range of ${lowerBound} to ${upperBound}, inclusive`);\n  }\n\n  if (!NumberIsFinite(x) || x === 0) {\n    return 0;\n  }\n\n  // TODO Use BigInt if supported?\n  // let xBigInt = BigInt(integerPart(x));\n  // xBigInt = BigInt.asUintN(64, xBigInt);\n  // return Number(xBigInt);\n\n  return x;\n}\n","import { IsReadableStream, ReadableStream } from '../readable-stream';\n\nexport function assertReadableStream(x: unknown, context: string): asserts x is ReadableStream {\n  if (!IsReadableStream(x)) {\n    throw new TypeError(`${context} is not a ReadableStream.`);\n  }\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericInitialize,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport { IsReadableStreamLocked, ReadableStream } from '../readable-stream';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { PullSteps } from '../abstract-ops/internal-methods';\nimport { newPromise, promiseRejectedWith } from '../helpers/webidl';\nimport { assertRequiredArgument } from '../validators/basic';\nimport { assertReadableStream } from '../validators/readable-stream';\n\n/**\n * A result returned by {@link ReadableStreamDefaultReader.read}.\n *\n * @public\n */\nexport type ReadableStreamDefaultReadResult<T> = {\n  done: false;\n  value: T;\n} | {\n  done: true;\n  value?: undefined;\n}\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamDefaultReader<R>(stream: ReadableStream): ReadableStreamDefaultReader<R> {\n  return new ReadableStreamDefaultReader(stream);\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamAddReadRequest<R>(stream: ReadableStream<R>,\n                                                readRequest: ReadRequest<R>): void {\n  assert(IsReadableStreamDefaultReader(stream._reader));\n  assert(stream._state === 'readable');\n\n  (stream._reader! as ReadableStreamDefaultReader<R>)._readRequests.push(readRequest);\n}\n\nexport function ReadableStreamFulfillReadRequest<R>(stream: ReadableStream<R>, chunk: R | undefined, done: boolean) {\n  const reader = stream._reader as ReadableStreamDefaultReader<R>;\n\n  assert(reader._readRequests.length > 0);\n\n  const readRequest = reader._readRequests.shift()!;\n  if (done) {\n    readRequest._closeSteps();\n  } else {\n    readRequest._chunkSteps(chunk!);\n  }\n}\n\nexport function ReadableStreamGetNumReadRequests<R>(stream: ReadableStream<R>): number {\n  return (stream._reader as ReadableStreamDefaultReader<R>)._readRequests.length;\n}\n\nexport function ReadableStreamHasDefaultReader(stream: ReadableStream): boolean {\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return false;\n  }\n\n  if (!IsReadableStreamDefaultReader(reader)) {\n    return false;\n  }\n\n  return true;\n}\n\n// Readers\n\nexport interface ReadRequest<R> {\n  _chunkSteps(chunk: R): void;\n\n  _closeSteps(): void;\n\n  _errorSteps(e: any): void;\n}\n\n/**\n * A default reader vended by a {@link ReadableStream}.\n *\n * @public\n */\nexport class ReadableStreamDefaultReader<R = any> {\n  /** @internal */\n  _ownerReadableStream!: ReadableStream<R>;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readRequests: SimpleQueue<ReadRequest<R>>;\n\n  constructor(stream: ReadableStream<R>) {\n    assertRequiredArgument(stream, 1, 'ReadableStreamDefaultReader');\n    assertReadableStream(stream, 'First parameter');\n\n    if (IsReadableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n    }\n\n    ReadableStreamReaderGenericInitialize(this, stream);\n\n    this._readRequests = new SimpleQueue();\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed,\n   * or rejected if the stream ever errors or the reader's lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('cancel'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('cancel'));\n    }\n\n    return ReadableStreamReaderGenericCancel(this, reason);\n  }\n\n  /**\n   * Returns a promise that allows access to the next chunk from the stream's internal queue, if available.\n   *\n   * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.\n   */\n  read(): Promise<ReadableStreamDefaultReadResult<R>> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('read'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('read from'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamDefaultReadResult<R>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamDefaultReadResult<R>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),\n      _closeSteps: () => resolvePromise({ value: undefined, done: true }),\n      _errorSteps: e => rejectPromise(e)\n    };\n    ReadableStreamDefaultReaderRead(this, readRequest);\n    return promise;\n  }\n\n  /**\n   * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.\n   * If the associated stream is errored when the lock is released, the reader will appear errored in the same way\n   * from now on; otherwise, the reader will appear closed.\n   *\n   * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by\n   * the reader's {@link ReadableStreamDefaultReader.read | read()} method has not yet been settled. Attempting to\n   * do so will throw a `TypeError` and leave the reader locked to the stream.\n   */\n  releaseLock(): void {\n    if (!IsReadableStreamDefaultReader(this)) {\n      throw defaultReaderBrandCheckException('releaseLock');\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return;\n    }\n\n    if (this._readRequests.length > 0) {\n      throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n    }\n\n    ReadableStreamReaderGenericRelease(this);\n  }\n}\n\nObject.defineProperties(ReadableStreamDefaultReader.prototype, {\n  cancel: { enumerable: true },\n  read: { enumerable: true },\n  releaseLock: { enumerable: true },\n  closed: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamDefaultReader.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamDefaultReader',\n    configurable: true\n  });\n}\n\n// Abstract operations for the readers.\n\nexport function IsReadableStreamDefaultReader<R = any>(x: any): x is ReadableStreamDefaultReader<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readRequests')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamDefaultReader;\n}\n\nexport function ReadableStreamDefaultReaderRead<R>(reader: ReadableStreamDefaultReader<R>,\n                                                   readRequest: ReadRequest<R>): void {\n  const stream = reader._ownerReadableStream;\n\n  assert(stream !== undefined);\n\n  stream._disturbed = true;\n\n  if (stream._state === 'closed') {\n    readRequest._closeSteps();\n  } else if (stream._state === 'errored') {\n    readRequest._errorSteps(stream._storedError);\n  } else {\n    assert(stream._state === 'readable');\n    stream._readableStreamController[PullSteps](readRequest as ReadRequest<any>);\n  }\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nfunction defaultReaderBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamDefaultReader.prototype.${name} can only be used on a ReadableStreamDefaultReader`);\n}\n","/// <reference lib=\"es2018.asynciterable\" />\n\nexport let AsyncIteratorPrototype: AsyncIterable<any> | undefined;\n\nif (typeof Symbol.asyncIterator === 'symbol') {\n  // We're running inside a ES2018+ environment, but we're compiling to an older syntax.\n  // We cannot access %AsyncIteratorPrototype% without non-ES2018 syntax, but we can re-create it.\n  AsyncIteratorPrototype = {\n    // 25.1.3.1 %AsyncIteratorPrototype% [ @@asyncIterator ] ( )\n    // https://tc39.github.io/ecma262/#sec-asynciteratorprototype-asynciterator\n    [Symbol.asyncIterator](this: AsyncIterator<any>) {\n      return this;\n    }\n  };\n  Object.defineProperty(AsyncIteratorPrototype, Symbol.asyncIterator, { enumerable: false });\n}\n","/// <reference lib=\"es2018.asynciterable\" />\n\nimport { ReadableStream } from '../readable-stream';\nimport {\n  AcquireReadableStreamDefaultReader,\n  ReadableStreamDefaultReader,\n  ReadableStreamDefaultReaderRead,\n  ReadableStreamDefaultReadResult,\n  ReadRequest\n} from './default-reader';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport assert from '../../stub/assert';\nimport { AsyncIteratorPrototype } from '@@target/stub/async-iterator-prototype';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport {\n  newPromise,\n  promiseRejectedWith,\n  promiseResolvedWith,\n  queueMicrotask,\n  transformPromiseWith\n} from '../helpers/webidl';\n\n/**\n * An async iterator returned by {@link ReadableStream.values}.\n *\n * @public\n */\nexport interface ReadableStreamAsyncIterator<R> extends AsyncIterator<R> {\n  next(): Promise<IteratorResult<R, undefined>>;\n\n  return(value?: any): Promise<IteratorResult<any>>;\n}\n\nexport class ReadableStreamAsyncIteratorImpl<R> {\n  private readonly _reader: ReadableStreamDefaultReader<R>;\n  private readonly _preventCancel: boolean;\n  private _ongoingPromise: Promise<ReadableStreamDefaultReadResult<R>> | undefined = undefined;\n  private _isFinished = false;\n\n  constructor(reader: ReadableStreamDefaultReader<R>, preventCancel: boolean) {\n    this._reader = reader;\n    this._preventCancel = preventCancel;\n  }\n\n  next(): Promise<ReadableStreamDefaultReadResult<R>> {\n    const nextSteps = () => this._nextSteps();\n    this._ongoingPromise = this._ongoingPromise ?\n      transformPromiseWith(this._ongoingPromise, nextSteps, nextSteps) :\n      nextSteps();\n    return this._ongoingPromise;\n  }\n\n  return(value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    const returnSteps = () => this._returnSteps(value);\n    return this._ongoingPromise ?\n      transformPromiseWith(this._ongoingPromise, returnSteps, returnSteps) :\n      returnSteps();\n  }\n\n  private _nextSteps(): Promise<ReadableStreamDefaultReadResult<R>> {\n    if (this._isFinished) {\n      return Promise.resolve({ value: undefined, done: true });\n    }\n\n    const reader = this._reader;\n    if (reader._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('iterate'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamDefaultReadResult<R>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamDefaultReadResult<R>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => {\n        this._ongoingPromise = undefined;\n        // This needs to be delayed by one microtask, otherwise we stop pulling too early which breaks a test.\n        // FIXME Is this a bug in the specification, or in the test?\n        queueMicrotask(() => resolvePromise({ value: chunk, done: false }));\n      },\n      _closeSteps: () => {\n        this._ongoingPromise = undefined;\n        this._isFinished = true;\n        ReadableStreamReaderGenericRelease(reader);\n        resolvePromise({ value: undefined, done: true });\n      },\n      _errorSteps: reason => {\n        this._ongoingPromise = undefined;\n        this._isFinished = true;\n        ReadableStreamReaderGenericRelease(reader);\n        rejectPromise(reason);\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n    return promise;\n  }\n\n  private _returnSteps(value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (this._isFinished) {\n      return Promise.resolve({ value, done: true });\n    }\n    this._isFinished = true;\n\n    const reader = this._reader;\n    if (reader._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('finish iterating'));\n    }\n\n    assert(reader._readRequests.length === 0);\n\n    if (!this._preventCancel) {\n      const result = ReadableStreamReaderGenericCancel(reader, value);\n      ReadableStreamReaderGenericRelease(reader);\n      return transformPromiseWith(result, () => ({ value, done: true }));\n    }\n\n    ReadableStreamReaderGenericRelease(reader);\n    return promiseResolvedWith({ value, done: true });\n  }\n}\n\ndeclare class ReadableStreamAsyncIteratorInstance<R> implements ReadableStreamAsyncIterator<R> {\n  /** @interal */\n  _asyncIteratorImpl: ReadableStreamAsyncIteratorImpl<R>;\n\n  next(): Promise<IteratorResult<R, undefined>>;\n\n  return(value?: any): Promise<IteratorResult<any>>;\n}\n\nconst ReadableStreamAsyncIteratorPrototype: ReadableStreamAsyncIteratorInstance<any> = {\n  next(this: ReadableStreamAsyncIteratorInstance<any>): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (!IsReadableStreamAsyncIterator(this)) {\n      return promiseRejectedWith(streamAsyncIteratorBrandCheckException('next'));\n    }\n    return this._asyncIteratorImpl.next();\n  },\n\n  return(this: ReadableStreamAsyncIteratorInstance<any>, value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (!IsReadableStreamAsyncIterator(this)) {\n      return promiseRejectedWith(streamAsyncIteratorBrandCheckException('return'));\n    }\n    return this._asyncIteratorImpl.return(value);\n  }\n} as any;\nif (AsyncIteratorPrototype !== undefined) {\n  Object.setPrototypeOf(ReadableStreamAsyncIteratorPrototype, AsyncIteratorPrototype);\n}\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamAsyncIterator<R>(stream: ReadableStream<R>,\n                                                      preventCancel: boolean): ReadableStreamAsyncIterator<R> {\n  const reader = AcquireReadableStreamDefaultReader<R>(stream);\n  const impl = new ReadableStreamAsyncIteratorImpl(reader, preventCancel);\n  const iterator: ReadableStreamAsyncIteratorInstance<R> = Object.create(ReadableStreamAsyncIteratorPrototype);\n  iterator._asyncIteratorImpl = impl;\n  return iterator;\n}\n\nfunction IsReadableStreamAsyncIterator<R = any>(x: any): x is ReadableStreamAsyncIterator<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_asyncIteratorImpl')) {\n    return false;\n  }\n\n  try {\n    // noinspection SuspiciousTypeOfGuard\n    return (x as ReadableStreamAsyncIteratorInstance<any>)._asyncIteratorImpl instanceof\n      ReadableStreamAsyncIteratorImpl;\n  } catch {\n    return false;\n  }\n}\n\n// Helper functions for the ReadableStream.\n\nfunction streamAsyncIteratorBrandCheckException(name: string): TypeError {\n  return new TypeError(`ReadableStreamAsyncIterator.${name} can only be used on a ReadableSteamAsyncIterator`);\n}\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Polyfill\nconst NumberIsNaN: typeof Number.isNaN = Number.isNaN || function (x) {\n  // eslint-disable-next-line no-self-compare\n  return x !== x;\n};\n\nexport default NumberIsNaN;\n","export function CreateArrayFromList<T extends any[]>(elements: T): T {\n  // We use arrays to represent lists, so this is basically a no-op.\n  // Do a slice though just in case we happen to depend on the unique-ness.\n  return elements.slice() as T;\n}\n\nexport function CopyDataBlockBytes(dest: ArrayBuffer,\n                                   destOffset: number,\n                                   src: ArrayBuffer,\n                                   srcOffset: number,\n                                   n: number) {\n  new Uint8Array(dest).set(new Uint8Array(src, srcOffset, n), destOffset);\n}\n\n// Not implemented correctly\nexport function TransferArrayBuffer<T extends ArrayBufferLike>(O: T): T {\n  return O;\n}\n\n// Not implemented correctly\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nexport function CanTransferArrayBuffer(O: ArrayBufferLike): boolean {\n  return true;\n}\n\n// Not implemented correctly\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nexport function IsDetachedBuffer(O: ArrayBufferLike): boolean {\n  return false;\n}\n\nexport function ArrayBufferSlice(buffer: ArrayBufferLike, begin: number, end: number): ArrayBufferLike {\n  // ArrayBuffer.prototype.slice is not available on IE10\n  // https://www.caniuse.com/mdn-javascript_builtins_arraybuffer_slice\n  if (buffer.slice) {\n    return buffer.slice(begin, end);\n  }\n  const length = end - begin;\n  const slice = new ArrayBuffer(length);\n  CopyDataBlockBytes(slice, 0, buffer, begin, length);\n  return slice;\n}\n","import NumberIsNaN from '../../stub/number-isnan';\nimport { ArrayBufferSlice } from './ecmascript';\n\nexport function IsNonNegativeNumber(v: number): boolean {\n  if (typeof v !== 'number') {\n    return false;\n  }\n\n  if (NumberIsNaN(v)) {\n    return false;\n  }\n\n  if (v < 0) {\n    return false;\n  }\n\n  return true;\n}\n\nexport function CloneAsUint8Array(O: ArrayBufferView): Uint8Array {\n  const buffer = ArrayBufferSlice(O.buffer, O.byteOffset, O.byteOffset + O.byteLength);\n  return new Uint8Array(buffer);\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport { IsNonNegativeNumber } from './miscellaneous';\n\nexport interface QueueContainer<T> {\n  _queue: SimpleQueue<T>;\n  _queueTotalSize: number;\n}\n\nexport interface QueuePair<T> {\n  value: T;\n  size: number;\n}\n\nexport function DequeueValue<T>(container: QueueContainer<QueuePair<T>>): T {\n  assert('_queue' in container && '_queueTotalSize' in container);\n  assert(container._queue.length > 0);\n\n  const pair = container._queue.shift()!;\n  container._queueTotalSize -= pair.size;\n  if (container._queueTotalSize < 0) {\n    container._queueTotalSize = 0;\n  }\n\n  return pair.value;\n}\n\nexport function EnqueueValueWithSize<T>(container: QueueContainer<QueuePair<T>>, value: T, size: number) {\n  assert('_queue' in container && '_queueTotalSize' in container);\n\n  if (!IsNonNegativeNumber(size) || size === Infinity) {\n    throw new RangeError('Size must be a finite, non-NaN, non-negative number.');\n  }\n\n  container._queue.push({ value, size });\n  container._queueTotalSize += size;\n}\n\nexport function PeekQueueValue<T>(container: QueueContainer<QueuePair<T>>): T {\n  assert('_queue' in container && '_queueTotalSize' in container);\n  assert(container._queue.length > 0);\n\n  const pair = container._queue.peek();\n  return pair.value;\n}\n\nexport function ResetQueue<T>(container: QueueContainer<T>) {\n  assert('_queue' in container && '_queueTotalSize' in container);\n\n  container._queue = new SimpleQueue<T>();\n  container._queueTotalSize = 0;\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport { ResetQueue } from '../abstract-ops/queue-with-sizes';\nimport {\n  ReadableStreamAddReadRequest,\n  ReadableStreamFulfillReadRequest,\n  ReadableStreamGetNumReadRequests,\n  ReadableStreamHasDefaultReader,\n  ReadRequest\n} from './default-reader';\nimport {\n  ReadableStreamAddReadIntoRequest,\n  ReadableStreamFulfillReadIntoRequest,\n  ReadableStreamGetNumReadIntoRequests,\n  ReadableStreamHasBYOBReader,\n  ReadIntoRequest\n} from './byob-reader';\nimport NumberIsInteger from '../../stub/number-isinteger';\nimport {\n  IsReadableStreamLocked,\n  ReadableByteStream,\n  ReadableStreamClose,\n  ReadableStreamError\n} from '../readable-stream';\nimport { ValidatedUnderlyingByteSource } from './underlying-source';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport {\n  ArrayBufferSlice,\n  CanTransferArrayBuffer,\n  CopyDataBlockBytes,\n  IsDetachedBuffer,\n  TransferArrayBuffer\n} from '../abstract-ops/ecmascript';\nimport { CancelSteps, PullSteps } from '../abstract-ops/internal-methods';\nimport { promiseResolvedWith, uponPromise } from '../helpers/webidl';\nimport { assertRequiredArgument, convertUnsignedLongLongWithEnforceRange } from '../validators/basic';\n\n/**\n * A pull-into request in a {@link ReadableByteStreamController}.\n *\n * @public\n */\nexport class ReadableStreamBYOBRequest {\n  /** @internal */\n  _associatedReadableByteStreamController!: ReadableByteStreamController;\n  /** @internal */\n  _view!: ArrayBufferView | null;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the view for writing in to, or `null` if the BYOB request has already been responded to.\n   */\n  get view(): ArrayBufferView | null {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('view');\n    }\n\n    return this._view;\n  }\n\n  /**\n   * Indicates to the associated readable byte stream that `bytesWritten` bytes were written into\n   * {@link ReadableStreamBYOBRequest.view | view}, causing the result be surfaced to the consumer.\n   *\n   * After this method is called, {@link ReadableStreamBYOBRequest.view | view} will be transferred and no longer\n   * modifiable.\n   */\n  respond(bytesWritten: number): void;\n  respond(bytesWritten: number | undefined): void {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('respond');\n    }\n    assertRequiredArgument(bytesWritten, 1, 'respond');\n    bytesWritten = convertUnsignedLongLongWithEnforceRange(bytesWritten, 'First parameter');\n\n    if (this._associatedReadableByteStreamController === undefined) {\n      throw new TypeError('This BYOB request has been invalidated');\n    }\n\n    if (IsDetachedBuffer(this._view!.buffer)) {\n      throw new TypeError(`The BYOB request's buffer has been detached and so cannot be used as a response`);\n    }\n\n    assert(this._view!.byteLength > 0);\n    assert(this._view!.buffer.byteLength > 0);\n\n    ReadableByteStreamControllerRespond(this._associatedReadableByteStreamController, bytesWritten);\n  }\n\n  /**\n   * Indicates to the associated readable byte stream that instead of writing into\n   * {@link ReadableStreamBYOBRequest.view | view}, the underlying byte source is providing a new `ArrayBufferView`,\n   * which will be given to the consumer of the readable byte stream.\n   *\n   * After this method is called, `view` will be transferred and no longer modifiable.\n   */\n  respondWithNewView(view: ArrayBufferView): void;\n  respondWithNewView(view: ArrayBufferView | undefined): void {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('respondWithNewView');\n    }\n    assertRequiredArgument(view, 1, 'respondWithNewView');\n\n    if (!ArrayBuffer.isView(view)) {\n      throw new TypeError('You can only respond with array buffer views');\n    }\n\n    if (this._associatedReadableByteStreamController === undefined) {\n      throw new TypeError('This BYOB request has been invalidated');\n    }\n\n    if (IsDetachedBuffer(view.buffer)) {\n      throw new TypeError('The given view\\'s buffer has been detached and so cannot be used as a response');\n    }\n\n    ReadableByteStreamControllerRespondWithNewView(this._associatedReadableByteStreamController, view);\n  }\n}\n\nObject.defineProperties(ReadableStreamBYOBRequest.prototype, {\n  respond: { enumerable: true },\n  respondWithNewView: { enumerable: true },\n  view: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamBYOBRequest.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamBYOBRequest',\n    configurable: true\n  });\n}\n\ninterface ArrayBufferViewConstructor<T extends ArrayBufferView = ArrayBufferView> {\n  new(buffer: ArrayBufferLike, byteOffset: number, length?: number): T;\n\n  readonly prototype: T;\n  readonly BYTES_PER_ELEMENT: number;\n}\n\ninterface ByteQueueElement {\n  buffer: ArrayBufferLike;\n  byteOffset: number;\n  byteLength: number;\n}\n\ntype PullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> =\n  DefaultPullIntoDescriptor\n  | BYOBPullIntoDescriptor<T>;\n\ninterface DefaultPullIntoDescriptor {\n  buffer: ArrayBufferLike;\n  bufferByteLength: number;\n  byteOffset: number;\n  byteLength: number;\n  bytesFilled: number;\n  elementSize: number;\n  viewConstructor: ArrayBufferViewConstructor<Uint8Array>;\n  readerType: 'default';\n}\n\ninterface BYOBPullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> {\n  buffer: ArrayBufferLike;\n  bufferByteLength: number;\n  byteOffset: number;\n  byteLength: number;\n  bytesFilled: number;\n  elementSize: number;\n  viewConstructor: ArrayBufferViewConstructor<T>;\n  readerType: 'byob';\n}\n\n/**\n * Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue.\n *\n * @public\n */\nexport class ReadableByteStreamController {\n  /** @internal */\n  _controlledReadableByteStream!: ReadableByteStream;\n  /** @internal */\n  _queue!: SimpleQueue<ByteQueueElement>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _closeRequested!: boolean;\n  /** @internal */\n  _pullAgain!: boolean;\n  /** @internal */\n  _pulling !: boolean;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _pullAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _cancelAlgorithm!: (reason: any) => Promise<void>;\n  /** @internal */\n  _autoAllocateChunkSize: number | undefined;\n  /** @internal */\n  _byobRequest: ReadableStreamBYOBRequest | null;\n  /** @internal */\n  _pendingPullIntos!: SimpleQueue<PullIntoDescriptor>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the current BYOB pull request, or `null` if there isn't one.\n   */\n  get byobRequest(): ReadableStreamBYOBRequest | null {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('byobRequest');\n    }\n\n    return ReadableByteStreamControllerGetBYOBRequest(this);\n  }\n\n  /**\n   * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is\n   * over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure.\n   */\n  get desiredSize(): number | null {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('desiredSize');\n    }\n\n    return ReadableByteStreamControllerGetDesiredSize(this);\n  }\n\n  /**\n   * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from\n   * the stream, but once those are read, the stream will become closed.\n   */\n  close(): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('close');\n    }\n\n    if (this._closeRequested) {\n      throw new TypeError('The stream has already been closed; do not close it again!');\n    }\n\n    const state = this._controlledReadableByteStream._state;\n    if (state !== 'readable') {\n      throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be closed`);\n    }\n\n    ReadableByteStreamControllerClose(this);\n  }\n\n  /**\n   * Enqueues the given chunk chunk in the controlled readable stream.\n   * The chunk has to be an `ArrayBufferView` instance, or else a `TypeError` will be thrown.\n   */\n  enqueue(chunk: ArrayBufferView): void;\n  enqueue(chunk: ArrayBufferView | undefined): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('enqueue');\n    }\n\n    assertRequiredArgument(chunk, 1, 'enqueue');\n    if (!ArrayBuffer.isView(chunk)) {\n      throw new TypeError('chunk must be an array buffer view');\n    }\n    if (chunk.byteLength === 0) {\n      throw new TypeError('chunk must have non-zero byteLength');\n    }\n    if (chunk.buffer.byteLength === 0) {\n      throw new TypeError(`chunk's buffer must have non-zero byteLength`);\n    }\n\n    if (this._closeRequested) {\n      throw new TypeError('stream is closed or draining');\n    }\n\n    const state = this._controlledReadableByteStream._state;\n    if (state !== 'readable') {\n      throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be enqueued to`);\n    }\n\n    ReadableByteStreamControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.\n   */\n  error(e: any = undefined): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('error');\n    }\n\n    ReadableByteStreamControllerError(this, e);\n  }\n\n  /** @internal */\n  [CancelSteps](reason: any): Promise<void> {\n    ReadableByteStreamControllerClearPendingPullIntos(this);\n\n    ResetQueue(this);\n\n    const result = this._cancelAlgorithm(reason);\n    ReadableByteStreamControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [PullSteps](readRequest: ReadRequest<Uint8Array>): void {\n    const stream = this._controlledReadableByteStream;\n    assert(ReadableStreamHasDefaultReader(stream));\n\n    if (this._queueTotalSize > 0) {\n      assert(ReadableStreamGetNumReadRequests(stream) === 0);\n\n      const entry = this._queue.shift()!;\n      this._queueTotalSize -= entry.byteLength;\n\n      ReadableByteStreamControllerHandleQueueDrain(this);\n\n      const view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);\n\n      readRequest._chunkSteps(view);\n      return;\n    }\n\n    const autoAllocateChunkSize = this._autoAllocateChunkSize;\n    if (autoAllocateChunkSize !== undefined) {\n      let buffer: ArrayBuffer;\n      try {\n        buffer = new ArrayBuffer(autoAllocateChunkSize);\n      } catch (bufferE) {\n        readRequest._errorSteps(bufferE);\n        return;\n      }\n\n      const pullIntoDescriptor: DefaultPullIntoDescriptor = {\n        buffer,\n        bufferByteLength: autoAllocateChunkSize,\n        byteOffset: 0,\n        byteLength: autoAllocateChunkSize,\n        bytesFilled: 0,\n        elementSize: 1,\n        viewConstructor: Uint8Array,\n        readerType: 'default'\n      };\n\n      this._pendingPullIntos.push(pullIntoDescriptor);\n    }\n\n    ReadableStreamAddReadRequest(stream, readRequest);\n    ReadableByteStreamControllerCallPullIfNeeded(this);\n  }\n}\n\nObject.defineProperties(ReadableByteStreamController.prototype, {\n  close: { enumerable: true },\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  byobRequest: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableByteStreamController.prototype, Symbol.toStringTag, {\n    value: 'ReadableByteStreamController',\n    configurable: true\n  });\n}\n\n// Abstract operations for the ReadableByteStreamController.\n\nexport function IsReadableByteStreamController(x: any): x is ReadableByteStreamController {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableByteStream')) {\n    return false;\n  }\n\n  return x instanceof ReadableByteStreamController;\n}\n\nfunction IsReadableStreamBYOBRequest(x: any): x is ReadableStreamBYOBRequest {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_associatedReadableByteStreamController')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamBYOBRequest;\n}\n\nfunction ReadableByteStreamControllerCallPullIfNeeded(controller: ReadableByteStreamController): void {\n  const shouldPull = ReadableByteStreamControllerShouldCallPull(controller);\n  if (!shouldPull) {\n    return;\n  }\n\n  if (controller._pulling) {\n    controller._pullAgain = true;\n    return;\n  }\n\n  assert(!controller._pullAgain);\n\n  controller._pulling = true;\n\n  // TODO: Test controller argument\n  const pullPromise = controller._pullAlgorithm();\n  uponPromise(\n    pullPromise,\n    () => {\n      controller._pulling = false;\n\n      if (controller._pullAgain) {\n        controller._pullAgain = false;\n        ReadableByteStreamControllerCallPullIfNeeded(controller);\n      }\n    },\n    e => {\n      ReadableByteStreamControllerError(controller, e);\n    }\n  );\n}\n\nfunction ReadableByteStreamControllerClearPendingPullIntos(controller: ReadableByteStreamController) {\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n  controller._pendingPullIntos = new SimpleQueue();\n}\n\nfunction ReadableByteStreamControllerCommitPullIntoDescriptor<T extends ArrayBufferView>(\n  stream: ReadableByteStream,\n  pullIntoDescriptor: PullIntoDescriptor<T>\n) {\n  assert(stream._state !== 'errored');\n\n  let done = false;\n  if (stream._state === 'closed') {\n    assert(pullIntoDescriptor.bytesFilled === 0);\n    done = true;\n  }\n\n  const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);\n  if (pullIntoDescriptor.readerType === 'default') {\n    ReadableStreamFulfillReadRequest(stream, filledView as unknown as Uint8Array, done);\n  } else {\n    assert(pullIntoDescriptor.readerType === 'byob');\n    ReadableStreamFulfillReadIntoRequest(stream, filledView, done);\n  }\n}\n\nfunction ReadableByteStreamControllerConvertPullIntoDescriptor<T extends ArrayBufferView>(\n  pullIntoDescriptor: PullIntoDescriptor<T>\n): T {\n  const bytesFilled = pullIntoDescriptor.bytesFilled;\n  const elementSize = pullIntoDescriptor.elementSize;\n\n  assert(bytesFilled <= pullIntoDescriptor.byteLength);\n  assert(bytesFilled % elementSize === 0);\n\n  return new pullIntoDescriptor.viewConstructor(\n    pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize) as T;\n}\n\nfunction ReadableByteStreamControllerEnqueueChunkToQueue(controller: ReadableByteStreamController,\n                                                         buffer: ArrayBufferLike,\n                                                         byteOffset: number,\n                                                         byteLength: number) {\n  controller._queue.push({ buffer, byteOffset, byteLength });\n  controller._queueTotalSize += byteLength;\n}\n\nfunction ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller: ReadableByteStreamController,\n                                                                     pullIntoDescriptor: PullIntoDescriptor) {\n  const elementSize = pullIntoDescriptor.elementSize;\n\n  const currentAlignedBytes = pullIntoDescriptor.bytesFilled - pullIntoDescriptor.bytesFilled % elementSize;\n\n  const maxBytesToCopy = Math.min(controller._queueTotalSize,\n                                  pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled);\n  const maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;\n  const maxAlignedBytes = maxBytesFilled - maxBytesFilled % elementSize;\n\n  let totalBytesToCopyRemaining = maxBytesToCopy;\n  let ready = false;\n  if (maxAlignedBytes > currentAlignedBytes) {\n    totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled;\n    ready = true;\n  }\n\n  const queue = controller._queue;\n\n  while (totalBytesToCopyRemaining > 0) {\n    const headOfQueue = queue.peek();\n\n    const bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength);\n\n    const destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n    CopyDataBlockBytes(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy);\n\n    if (headOfQueue.byteLength === bytesToCopy) {\n      queue.shift();\n    } else {\n      headOfQueue.byteOffset += bytesToCopy;\n      headOfQueue.byteLength -= bytesToCopy;\n    }\n    controller._queueTotalSize -= bytesToCopy;\n\n    ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor);\n\n    totalBytesToCopyRemaining -= bytesToCopy;\n  }\n\n  if (!ready) {\n    assert(controller._queueTotalSize === 0);\n    assert(pullIntoDescriptor.bytesFilled > 0);\n    assert(pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize);\n  }\n\n  return ready;\n}\n\nfunction ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller: ReadableByteStreamController,\n                                                                size: number,\n                                                                pullIntoDescriptor: PullIntoDescriptor) {\n  assert(controller._pendingPullIntos.length === 0 || controller._pendingPullIntos.peek() === pullIntoDescriptor);\n  assert(controller._byobRequest === null);\n  pullIntoDescriptor.bytesFilled += size;\n}\n\nfunction ReadableByteStreamControllerHandleQueueDrain(controller: ReadableByteStreamController) {\n  assert(controller._controlledReadableByteStream._state === 'readable');\n\n  if (controller._queueTotalSize === 0 && controller._closeRequested) {\n    ReadableByteStreamControllerClearAlgorithms(controller);\n    ReadableStreamClose(controller._controlledReadableByteStream);\n  } else {\n    ReadableByteStreamControllerCallPullIfNeeded(controller);\n  }\n}\n\nfunction ReadableByteStreamControllerInvalidateBYOBRequest(controller: ReadableByteStreamController) {\n  if (controller._byobRequest === null) {\n    return;\n  }\n\n  controller._byobRequest._associatedReadableByteStreamController = undefined!;\n  controller._byobRequest._view = null!;\n  controller._byobRequest = null;\n}\n\nfunction ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller: ReadableByteStreamController) {\n  assert(!controller._closeRequested);\n\n  while (controller._pendingPullIntos.length > 0) {\n    if (controller._queueTotalSize === 0) {\n      return;\n    }\n\n    const pullIntoDescriptor = controller._pendingPullIntos.peek();\n\n    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {\n      ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n      ReadableByteStreamControllerCommitPullIntoDescriptor(\n        controller._controlledReadableByteStream,\n        pullIntoDescriptor\n      );\n    }\n  }\n}\n\nexport function ReadableByteStreamControllerPullInto<T extends ArrayBufferView>(\n  controller: ReadableByteStreamController,\n  view: T,\n  readIntoRequest: ReadIntoRequest<T>\n): void {\n  const stream = controller._controlledReadableByteStream;\n\n  let elementSize = 1;\n  if (view.constructor !== DataView) {\n    elementSize = (view.constructor as ArrayBufferViewConstructor<T>).BYTES_PER_ELEMENT;\n  }\n\n  const ctor = view.constructor as ArrayBufferViewConstructor<T>;\n\n  // try {\n  const buffer = TransferArrayBuffer(view.buffer);\n  // } catch (e) {\n  //   readIntoRequest._errorSteps(e);\n  //   return;\n  // }\n\n  const pullIntoDescriptor: BYOBPullIntoDescriptor<T> = {\n    buffer,\n    bufferByteLength: buffer.byteLength,\n    byteOffset: view.byteOffset,\n    byteLength: view.byteLength,\n    bytesFilled: 0,\n    elementSize,\n    viewConstructor: ctor,\n    readerType: 'byob'\n  };\n\n  if (controller._pendingPullIntos.length > 0) {\n    controller._pendingPullIntos.push(pullIntoDescriptor);\n\n    // No ReadableByteStreamControllerCallPullIfNeeded() call since:\n    // - No change happens on desiredSize\n    // - The source has already been notified of that there's at least 1 pending read(view)\n\n    ReadableStreamAddReadIntoRequest(stream, readIntoRequest);\n    return;\n  }\n\n  if (stream._state === 'closed') {\n    const emptyView = new ctor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0);\n    readIntoRequest._closeSteps(emptyView);\n    return;\n  }\n\n  if (controller._queueTotalSize > 0) {\n    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {\n      const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);\n\n      ReadableByteStreamControllerHandleQueueDrain(controller);\n\n      readIntoRequest._chunkSteps(filledView);\n      return;\n    }\n\n    if (controller._closeRequested) {\n      const e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n      ReadableByteStreamControllerError(controller, e);\n\n      readIntoRequest._errorSteps(e);\n      return;\n    }\n  }\n\n  controller._pendingPullIntos.push(pullIntoDescriptor);\n\n  ReadableStreamAddReadIntoRequest<T>(stream, readIntoRequest);\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nfunction ReadableByteStreamControllerRespondInClosedState(controller: ReadableByteStreamController,\n                                                          firstDescriptor: PullIntoDescriptor) {\n  assert(firstDescriptor.bytesFilled === 0);\n\n  const stream = controller._controlledReadableByteStream;\n  if (ReadableStreamHasBYOBReader(stream)) {\n    while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n      const pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);\n      ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);\n    }\n  }\n}\n\nfunction ReadableByteStreamControllerRespondInReadableState(controller: ReadableByteStreamController,\n                                                            bytesWritten: number,\n                                                            pullIntoDescriptor: PullIntoDescriptor) {\n  assert(pullIntoDescriptor.bytesFilled + bytesWritten <= pullIntoDescriptor.byteLength);\n\n  ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor);\n\n  if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {\n    return;\n  }\n\n  ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n  const remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize;\n  if (remainderSize > 0) {\n    const end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n    const remainder = ArrayBufferSlice(pullIntoDescriptor.buffer, end - remainderSize, end);\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength);\n  }\n\n  pullIntoDescriptor.bytesFilled -= remainderSize;\n  ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);\n\n  ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n}\n\nfunction ReadableByteStreamControllerRespondInternal(controller: ReadableByteStreamController, bytesWritten: number) {\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  assert(CanTransferArrayBuffer(firstDescriptor.buffer));\n\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n\n  const state = controller._controlledReadableByteStream._state;\n  if (state === 'closed') {\n    assert(bytesWritten === 0);\n    ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor);\n  } else {\n    assert(state === 'readable');\n    assert(bytesWritten > 0);\n    ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);\n  }\n\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nfunction ReadableByteStreamControllerShiftPendingPullInto(\n  controller: ReadableByteStreamController\n): PullIntoDescriptor {\n  assert(controller._byobRequest === null);\n  const descriptor = controller._pendingPullIntos.shift()!;\n  return descriptor;\n}\n\nfunction ReadableByteStreamControllerShouldCallPull(controller: ReadableByteStreamController): boolean {\n  const stream = controller._controlledReadableByteStream;\n\n  if (stream._state !== 'readable') {\n    return false;\n  }\n\n  if (controller._closeRequested) {\n    return false;\n  }\n\n  if (!controller._started) {\n    return false;\n  }\n\n  if (ReadableStreamHasDefaultReader(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    return true;\n  }\n\n  if (ReadableStreamHasBYOBReader(stream) && ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n    return true;\n  }\n\n  const desiredSize = ReadableByteStreamControllerGetDesiredSize(controller);\n  assert(desiredSize !== null);\n  if (desiredSize! > 0) {\n    return true;\n  }\n\n  return false;\n}\n\nfunction ReadableByteStreamControllerClearAlgorithms(controller: ReadableByteStreamController) {\n  controller._pullAlgorithm = undefined!;\n  controller._cancelAlgorithm = undefined!;\n}\n\n// A client of ReadableByteStreamController may use these functions directly to bypass state check.\n\nexport function ReadableByteStreamControllerClose(controller: ReadableByteStreamController) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (controller._closeRequested || stream._state !== 'readable') {\n    return;\n  }\n\n  if (controller._queueTotalSize > 0) {\n    controller._closeRequested = true;\n\n    return;\n  }\n\n  if (controller._pendingPullIntos.length > 0) {\n    const firstPendingPullInto = controller._pendingPullIntos.peek();\n    if (firstPendingPullInto.bytesFilled > 0) {\n      const e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n      ReadableByteStreamControllerError(controller, e);\n\n      throw e;\n    }\n  }\n\n  ReadableByteStreamControllerClearAlgorithms(controller);\n  ReadableStreamClose(stream);\n}\n\nexport function ReadableByteStreamControllerEnqueue(controller: ReadableByteStreamController, chunk: ArrayBufferView) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (controller._closeRequested || stream._state !== 'readable') {\n    return;\n  }\n\n  const buffer = chunk.buffer;\n  const byteOffset = chunk.byteOffset;\n  const byteLength = chunk.byteLength;\n  if (IsDetachedBuffer(buffer)) {\n    throw new TypeError('chunk\\'s buffer is detached and so cannot be enqueued');\n  }\n  const transferredBuffer = TransferArrayBuffer(buffer);\n\n  if (controller._pendingPullIntos.length > 0) {\n    const firstPendingPullInto = controller._pendingPullIntos.peek();\n    if (IsDetachedBuffer(firstPendingPullInto.buffer)) {\n      throw new TypeError(\n        'The BYOB request\\'s buffer has been detached and so cannot be filled with an enqueued chunk'\n      );\n    }\n    firstPendingPullInto.buffer = TransferArrayBuffer(firstPendingPullInto.buffer);\n  }\n\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n\n  if (ReadableStreamHasDefaultReader(stream)) {\n    if (ReadableStreamGetNumReadRequests(stream) === 0) {\n      assert(controller._pendingPullIntos.length === 0);\n      ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n    } else {\n      assert(controller._queue.length === 0);\n      if (controller._pendingPullIntos.length > 0) {\n        assert(controller._pendingPullIntos.peek().readerType === 'default');\n        ReadableByteStreamControllerShiftPendingPullInto(controller);\n      }\n      const transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength);\n      ReadableStreamFulfillReadRequest(stream, transferredView, false);\n    }\n  } else if (ReadableStreamHasBYOBReader(stream)) {\n    // TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully.\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n    ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n  } else {\n    assert(!IsReadableStreamLocked(stream));\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n  }\n\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nexport function ReadableByteStreamControllerError(controller: ReadableByteStreamController, e: any) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (stream._state !== 'readable') {\n    return;\n  }\n\n  ReadableByteStreamControllerClearPendingPullIntos(controller);\n\n  ResetQueue(controller);\n  ReadableByteStreamControllerClearAlgorithms(controller);\n  ReadableStreamError(stream, e);\n}\n\nexport function ReadableByteStreamControllerGetBYOBRequest(\n  controller: ReadableByteStreamController\n): ReadableStreamBYOBRequest | null {\n  if (controller._byobRequest === null && controller._pendingPullIntos.length > 0) {\n    const firstDescriptor = controller._pendingPullIntos.peek();\n    const view = new Uint8Array(firstDescriptor.buffer,\n                                firstDescriptor.byteOffset + firstDescriptor.bytesFilled,\n                                firstDescriptor.byteLength - firstDescriptor.bytesFilled);\n\n    const byobRequest: ReadableStreamBYOBRequest = Object.create(ReadableStreamBYOBRequest.prototype);\n    SetUpReadableStreamBYOBRequest(byobRequest, controller, view);\n    controller._byobRequest = byobRequest;\n  }\n  return controller._byobRequest;\n}\n\nfunction ReadableByteStreamControllerGetDesiredSize(controller: ReadableByteStreamController): number | null {\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'errored') {\n    return null;\n  }\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\nexport function ReadableByteStreamControllerRespond(controller: ReadableByteStreamController, bytesWritten: number) {\n  assert(controller._pendingPullIntos.length > 0);\n\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'closed') {\n    if (bytesWritten !== 0) {\n      throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream');\n    }\n  } else {\n    assert(state === 'readable');\n    if (bytesWritten === 0) {\n      throw new TypeError('bytesWritten must be greater than 0 when calling respond() on a readable stream');\n    }\n    if (firstDescriptor.bytesFilled + bytesWritten > firstDescriptor.byteLength) {\n      throw new RangeError('bytesWritten out of range');\n    }\n  }\n\n  firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer);\n\n  ReadableByteStreamControllerRespondInternal(controller, bytesWritten);\n}\n\nexport function ReadableByteStreamControllerRespondWithNewView(controller: ReadableByteStreamController,\n                                                               view: ArrayBufferView) {\n  assert(controller._pendingPullIntos.length > 0);\n  assert(!IsDetachedBuffer(view.buffer));\n\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'closed') {\n    if (view.byteLength !== 0) {\n      throw new TypeError('The view\\'s length must be 0 when calling respondWithNewView() on a closed stream');\n    }\n  } else {\n    assert(state === 'readable');\n    if (view.byteLength === 0) {\n      throw new TypeError(\n        'The view\\'s length must be greater than 0 when calling respondWithNewView() on a readable stream'\n      );\n    }\n  }\n\n  if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) {\n    throw new RangeError('The region specified by view does not match byobRequest');\n  }\n  if (firstDescriptor.bufferByteLength !== view.buffer.byteLength) {\n    throw new RangeError('The buffer of view has different capacity than byobRequest');\n  }\n  if (firstDescriptor.bytesFilled + view.byteLength > firstDescriptor.byteLength) {\n    throw new RangeError('The region specified by view is larger than byobRequest');\n  }\n\n  const viewByteLength = view.byteLength;\n  firstDescriptor.buffer = TransferArrayBuffer(view.buffer);\n  ReadableByteStreamControllerRespondInternal(controller, viewByteLength);\n}\n\nexport function SetUpReadableByteStreamController(stream: ReadableByteStream,\n                                                  controller: ReadableByteStreamController,\n                                                  startAlgorithm: () => void | PromiseLike<void>,\n                                                  pullAlgorithm: () => Promise<void>,\n                                                  cancelAlgorithm: (reason: any) => Promise<void>,\n                                                  highWaterMark: number,\n                                                  autoAllocateChunkSize: number | undefined) {\n  assert(stream._readableStreamController === undefined);\n  if (autoAllocateChunkSize !== undefined) {\n    assert(NumberIsInteger(autoAllocateChunkSize));\n    assert(autoAllocateChunkSize > 0);\n  }\n\n  controller._controlledReadableByteStream = stream;\n\n  controller._pullAgain = false;\n  controller._pulling = false;\n\n  controller._byobRequest = null;\n\n  // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n  controller._queue = controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._closeRequested = false;\n  controller._started = false;\n\n  controller._strategyHWM = highWaterMark;\n\n  controller._pullAlgorithm = pullAlgorithm;\n  controller._cancelAlgorithm = cancelAlgorithm;\n\n  controller._autoAllocateChunkSize = autoAllocateChunkSize;\n\n  controller._pendingPullIntos = new SimpleQueue();\n\n  stream._readableStreamController = controller;\n\n  const startResult = startAlgorithm();\n  uponPromise(\n    promiseResolvedWith(startResult),\n    () => {\n      controller._started = true;\n\n      assert(!controller._pulling);\n      assert(!controller._pullAgain);\n\n      ReadableByteStreamControllerCallPullIfNeeded(controller);\n    },\n    r => {\n      ReadableByteStreamControllerError(controller, r);\n    }\n  );\n}\n\nexport function SetUpReadableByteStreamControllerFromUnderlyingSource(\n  stream: ReadableByteStream,\n  underlyingByteSource: ValidatedUnderlyingByteSource,\n  highWaterMark: number\n) {\n  const controller: ReadableByteStreamController = Object.create(ReadableByteStreamController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let pullAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let cancelAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingByteSource.start !== undefined) {\n    startAlgorithm = () => underlyingByteSource.start!(controller);\n  }\n  if (underlyingByteSource.pull !== undefined) {\n    pullAlgorithm = () => underlyingByteSource.pull!(controller);\n  }\n  if (underlyingByteSource.cancel !== undefined) {\n    cancelAlgorithm = reason => underlyingByteSource.cancel!(reason);\n  }\n\n  const autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;\n  if (autoAllocateChunkSize === 0) {\n    throw new TypeError('autoAllocateChunkSize must be greater than 0');\n  }\n\n  SetUpReadableByteStreamController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize\n  );\n}\n\nfunction SetUpReadableStreamBYOBRequest(request: ReadableStreamBYOBRequest,\n                                        controller: ReadableByteStreamController,\n                                        view: ArrayBufferView) {\n  assert(IsReadableByteStreamController(controller));\n  assert(typeof view === 'object');\n  assert(ArrayBuffer.isView(view));\n  assert(!IsDetachedBuffer(view.buffer));\n  request._associatedReadableByteStreamController = controller;\n  request._view = view;\n}\n\n// Helper functions for the ReadableStreamBYOBRequest.\n\nfunction byobRequestBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamBYOBRequest.prototype.${name} can only be used on a ReadableStreamBYOBRequest`);\n}\n\n// Helper functions for the ReadableByteStreamController.\n\nfunction byteStreamControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableByteStreamController.prototype.${name} can only be used on a ReadableByteStreamController`);\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericInitialize,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport { IsReadableStreamLocked, ReadableByteStream, ReadableStream } from '../readable-stream';\nimport {\n  IsReadableByteStreamController,\n  ReadableByteStreamController,\n  ReadableByteStreamControllerPullInto\n} from './byte-stream-controller';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { newPromise, promiseRejectedWith } from '../helpers/webidl';\nimport { assertRequiredArgument } from '../validators/basic';\nimport { assertReadableStream } from '../validators/readable-stream';\nimport { IsDetachedBuffer } from '../abstract-ops/ecmascript';\n\n/**\n * A result returned by {@link ReadableStreamBYOBReader.read}.\n *\n * @public\n */\nexport type ReadableStreamBYOBReadResult<T extends ArrayBufferView> = {\n  done: false;\n  value: T;\n} | {\n  done: true;\n  value: T | undefined;\n};\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamBYOBReader(stream: ReadableByteStream): ReadableStreamBYOBReader {\n  return new ReadableStreamBYOBReader(stream);\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamAddReadIntoRequest<T extends ArrayBufferView>(stream: ReadableByteStream,\n                                                                            readIntoRequest: ReadIntoRequest<T>): void {\n  assert(IsReadableStreamBYOBReader(stream._reader));\n  assert(stream._state === 'readable' || stream._state === 'closed');\n\n  (stream._reader! as ReadableStreamBYOBReader)._readIntoRequests.push(readIntoRequest);\n}\n\nexport function ReadableStreamFulfillReadIntoRequest(stream: ReadableByteStream,\n                                                     chunk: ArrayBufferView,\n                                                     done: boolean) {\n  const reader = stream._reader as ReadableStreamBYOBReader;\n\n  assert(reader._readIntoRequests.length > 0);\n\n  const readIntoRequest = reader._readIntoRequests.shift()!;\n  if (done) {\n    readIntoRequest._closeSteps(chunk);\n  } else {\n    readIntoRequest._chunkSteps(chunk);\n  }\n}\n\nexport function ReadableStreamGetNumReadIntoRequests(stream: ReadableByteStream): number {\n  return (stream._reader as ReadableStreamBYOBReader)._readIntoRequests.length;\n}\n\nexport function ReadableStreamHasBYOBReader(stream: ReadableByteStream): boolean {\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return false;\n  }\n\n  if (!IsReadableStreamBYOBReader(reader)) {\n    return false;\n  }\n\n  return true;\n}\n\n// Readers\n\nexport interface ReadIntoRequest<T extends ArrayBufferView> {\n  _chunkSteps(chunk: T): void;\n\n  _closeSteps(chunk: T | undefined): void;\n\n  _errorSteps(e: any): void;\n}\n\n/**\n * A BYOB reader vended by a {@link ReadableStream}.\n *\n * @public\n */\nexport class ReadableStreamBYOBReader {\n  /** @internal */\n  _ownerReadableStream!: ReadableByteStream;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readIntoRequests: SimpleQueue<ReadIntoRequest<any>>;\n\n  constructor(stream: ReadableByteStream) {\n    assertRequiredArgument(stream, 1, 'ReadableStreamBYOBReader');\n    assertReadableStream(stream, 'First parameter');\n\n    if (IsReadableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n    }\n\n    if (!IsReadableByteStreamController(stream._readableStreamController)) {\n      throw new TypeError('Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte ' +\n        'source');\n    }\n\n    ReadableStreamReaderGenericInitialize(this, stream);\n\n    this._readIntoRequests = new SimpleQueue();\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or\n   * the reader's lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('cancel'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('cancel'));\n    }\n\n    return ReadableStreamReaderGenericCancel(this, reason);\n  }\n\n  /**\n   * Attempts to reads bytes into view, and returns a promise resolved with the result.\n   *\n   * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.\n   */\n  read<T extends ArrayBufferView>(view: T): Promise<ReadableStreamBYOBReadResult<T>> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('read'));\n    }\n\n    if (!ArrayBuffer.isView(view)) {\n      return promiseRejectedWith(new TypeError('view must be an array buffer view'));\n    }\n    if (view.byteLength === 0) {\n      return promiseRejectedWith(new TypeError('view must have non-zero byteLength'));\n    }\n    if (view.buffer.byteLength === 0) {\n      return promiseRejectedWith(new TypeError(`view's buffer must have non-zero byteLength`));\n    }\n    if (IsDetachedBuffer(view.buffer)) {\n      return promiseRejectedWith(new TypeError('view\\'s buffer has been detached'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('read from'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamBYOBReadResult<T>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamBYOBReadResult<T>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readIntoRequest: ReadIntoRequest<T> = {\n      _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),\n      _closeSteps: chunk => resolvePromise({ value: chunk, done: true }),\n      _errorSteps: e => rejectPromise(e)\n    };\n    ReadableStreamBYOBReaderRead(this, view, readIntoRequest);\n    return promise;\n  }\n\n  /**\n   * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.\n   * If the associated stream is errored when the lock is released, the reader will appear errored in the same way\n   * from now on; otherwise, the reader will appear closed.\n   *\n   * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by\n   * the reader's {@link ReadableStreamBYOBReader.read | read()} method has not yet been settled. Attempting to\n   * do so will throw a `TypeError` and leave the reader locked to the stream.\n   */\n  releaseLock(): void {\n    if (!IsReadableStreamBYOBReader(this)) {\n      throw byobReaderBrandCheckException('releaseLock');\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return;\n    }\n\n    if (this._readIntoRequests.length > 0) {\n      throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n    }\n\n    ReadableStreamReaderGenericRelease(this);\n  }\n}\n\nObject.defineProperties(ReadableStreamBYOBReader.prototype, {\n  cancel: { enumerable: true },\n  read: { enumerable: true },\n  releaseLock: { enumerable: true },\n  closed: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamBYOBReader.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamBYOBReader',\n    configurable: true\n  });\n}\n\n// Abstract operations for the readers.\n\nexport function IsReadableStreamBYOBReader(x: any): x is ReadableStreamBYOBReader {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readIntoRequests')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamBYOBReader;\n}\n\nexport function ReadableStreamBYOBReaderRead<T extends ArrayBufferView>(\n  reader: ReadableStreamBYOBReader,\n  view: T,\n  readIntoRequest: ReadIntoRequest<T>\n): void {\n  const stream = reader._ownerReadableStream;\n\n  assert(stream !== undefined);\n\n  stream._disturbed = true;\n\n  if (stream._state === 'errored') {\n    readIntoRequest._errorSteps(stream._storedError);\n  } else {\n    ReadableByteStreamControllerPullInto(\n      stream._readableStreamController as ReadableByteStreamController,\n      view,\n      readIntoRequest\n    );\n  }\n}\n\n// Helper functions for the ReadableStreamBYOBReader.\n\nfunction byobReaderBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamBYOBReader.prototype.${name} can only be used on a ReadableStreamBYOBReader`);\n}\n","import { QueuingStrategy, QueuingStrategySizeCallback } from '../queuing-strategy';\nimport NumberIsNaN from '../../stub/number-isnan';\n\nexport function ExtractHighWaterMark(strategy: QueuingStrategy, defaultHWM: number): number {\n  const { highWaterMark } = strategy;\n\n  if (highWaterMark === undefined) {\n    return defaultHWM;\n  }\n\n  if (NumberIsNaN(highWaterMark) || highWaterMark < 0) {\n    throw new RangeError('Invalid highWaterMark');\n  }\n\n  return highWaterMark;\n}\n\nexport function ExtractSizeAlgorithm<T>(strategy: QueuingStrategy<T>): QueuingStrategySizeCallback<T> {\n  const { size } = strategy;\n\n  if (!size) {\n    return () => 1;\n  }\n\n  return size;\n}\n","import { QueuingStrategy, QueuingStrategySizeCallback } from '../queuing-strategy';\nimport { assertDictionary, assertFunction, convertUnrestrictedDouble } from './basic';\n\nexport function convertQueuingStrategy<T>(init: QueuingStrategy<T> | null | undefined,\n                                          context: string): QueuingStrategy<T> {\n  assertDictionary(init, context);\n  const highWaterMark = init?.highWaterMark;\n  const size = init?.size;\n  return {\n    highWaterMark: highWaterMark === undefined ? undefined : convertUnrestrictedDouble(highWaterMark),\n    size: size === undefined ? undefined : convertQueuingStrategySize(size, `${context} has member 'size' that`)\n  };\n}\n\nfunction convertQueuingStrategySize<T>(fn: QueuingStrategySizeCallback<T>,\n                                       context: string): QueuingStrategySizeCallback<T> {\n  assertFunction(fn, context);\n  return chunk => convertUnrestrictedDouble(fn(chunk));\n}\n","import { assertDictionary, assertFunction } from './basic';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\nimport {\n  UnderlyingSink,\n  UnderlyingSinkAbortCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  ValidatedUnderlyingSink\n} from '../writable-stream/underlying-sink';\nimport { WritableStreamDefaultController } from '../writable-stream';\n\nexport function convertUnderlyingSink<W>(original: UnderlyingSink<W> | null,\n                                         context: string): ValidatedUnderlyingSink<W> {\n  assertDictionary(original, context);\n  const abort = original?.abort;\n  const close = original?.close;\n  const start = original?.start;\n  const type = original?.type;\n  const write = original?.write;\n  return {\n    abort: abort === undefined ?\n      undefined :\n      convertUnderlyingSinkAbortCallback(abort, original!, `${context} has member 'abort' that`),\n    close: close === undefined ?\n      undefined :\n      convertUnderlyingSinkCloseCallback(close, original!, `${context} has member 'close' that`),\n    start: start === undefined ?\n      undefined :\n      convertUnderlyingSinkStartCallback(start, original!, `${context} has member 'start' that`),\n    write: write === undefined ?\n      undefined :\n      convertUnderlyingSinkWriteCallback(write, original!, `${context} has member 'write' that`),\n    type\n  };\n}\n\nfunction convertUnderlyingSinkAbortCallback(\n  fn: UnderlyingSinkAbortCallback,\n  original: UnderlyingSink,\n  context: string\n): (reason: any) => Promise<void> {\n  assertFunction(fn, context);\n  return (reason: any) => promiseCall(fn, original, [reason]);\n}\n\nfunction convertUnderlyingSinkCloseCallback(\n  fn: UnderlyingSinkCloseCallback,\n  original: UnderlyingSink,\n  context: string\n): () => Promise<void> {\n  assertFunction(fn, context);\n  return () => promiseCall(fn, original, []);\n}\n\nfunction convertUnderlyingSinkStartCallback(\n  fn: UnderlyingSinkStartCallback,\n  original: UnderlyingSink,\n  context: string\n): UnderlyingSinkStartCallback {\n  assertFunction(fn, context);\n  return (controller: WritableStreamDefaultController) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertUnderlyingSinkWriteCallback<W>(\n  fn: UnderlyingSinkWriteCallback<W>,\n  original: UnderlyingSink<W>,\n  context: string\n): (chunk: W, controller: WritableStreamDefaultController) => Promise<void> {\n  assertFunction(fn, context);\n  return (chunk: W, controller: WritableStreamDefaultController) => promiseCall(fn, original, [chunk, controller]);\n}\n","import { IsWritableStream, WritableStream } from '../writable-stream';\n\nexport function assertWritableStream(x: unknown, context: string): asserts x is WritableStream {\n  if (!IsWritableStream(x)) {\n    throw new TypeError(`${context} is not a WritableStream.`);\n  }\n}\n","/**\n * A signal object that allows you to communicate with a request and abort it if required\n * via its associated `AbortController` object.\n *\n * @remarks\n *   This interface is compatible with the `AbortSignal` interface defined in TypeScript's DOM types.\n *   It is redefined here, so it can be polyfilled without a DOM, for example with\n *   {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.\n *\n * @public\n */\nexport interface AbortSignal {\n  /**\n   * Whether the request is aborted.\n   */\n  readonly aborted: boolean;\n\n  /**\n   * Add an event listener to be triggered when this signal becomes aborted.\n   */\n  addEventListener(type: 'abort', listener: () => void): void;\n\n  /**\n   * Remove an event listener that was previously added with {@link AbortSignal.addEventListener}.\n   */\n  removeEventListener(type: 'abort', listener: () => void): void;\n}\n\nexport function isAbortSignal(value: unknown): value is AbortSignal {\n  if (typeof value !== 'object' || value === null) {\n    return false;\n  }\n  try {\n    return typeof (value as AbortSignal).aborted === 'boolean';\n  } catch {\n    // AbortSignal.prototype.aborted throws if its brand check fails\n    return false;\n  }\n}\n\n/**\n * A controller object that allows you to abort an `AbortSignal` when desired.\n *\n * @remarks\n *   This interface is compatible with the `AbortController` interface defined in TypeScript's DOM types.\n *   It is redefined here, so it can be polyfilled without a DOM, for example with\n *   {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.\n *\n * @internal\n */\nexport interface AbortController {\n  readonly signal: AbortSignal;\n\n  abort(): void;\n}\n\ninterface AbortControllerConstructor {\n  new(): AbortController;\n}\n\nconst supportsAbortController = typeof (AbortController as any) === 'function';\n\n/**\n * Construct a new AbortController, if supported by the platform.\n *\n * @internal\n */\nexport function createAbortController(): AbortController | undefined {\n  if (supportsAbortController) {\n    return new (AbortController as AbortControllerConstructor)();\n  }\n  return undefined;\n}\n","import assert from '../stub/assert';\nimport {\n  newPromise,\n  promiseRejectedWith,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  uponPromise\n} from './helpers/webidl';\nimport {\n  DequeueValue,\n  EnqueueValueWithSize,\n  PeekQueueValue,\n  QueuePair,\n  ResetQueue\n} from './abstract-ops/queue-with-sizes';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { SimpleQueue } from './simple-queue';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { AbortSteps, ErrorSteps } from './abstract-ops/internal-methods';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport {\n  UnderlyingSink,\n  UnderlyingSinkAbortCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  ValidatedUnderlyingSink\n} from './writable-stream/underlying-sink';\nimport { assertObject, assertRequiredArgument } from './validators/basic';\nimport { convertUnderlyingSink } from './validators/underlying-sink';\nimport { assertWritableStream } from './validators/writable-stream';\nimport { AbortController, AbortSignal, createAbortController } from './abort-signal';\n\ntype WritableStreamState = 'writable' | 'closed' | 'erroring' | 'errored';\n\ninterface WriteOrCloseRequest {\n  _resolve: (value?: undefined) => void;\n  _reject: (reason: any) => void;\n}\n\ntype WriteRequest = WriteOrCloseRequest;\ntype CloseRequest = WriteOrCloseRequest;\n\ninterface PendingAbortRequest {\n  _promise: Promise<undefined>;\n  _resolve: (value?: undefined) => void;\n  _reject: (reason: any) => void;\n  _reason: any;\n  _wasAlreadyErroring: boolean;\n}\n\n/**\n * A writable stream represents a destination for data, into which you can write.\n *\n * @public\n */\nclass WritableStream<W = any> {\n  /** @internal */\n  _state!: WritableStreamState;\n  /** @internal */\n  _storedError: any;\n  /** @internal */\n  _writer: WritableStreamDefaultWriter<W> | undefined;\n  /** @internal */\n  _writableStreamController!: WritableStreamDefaultController<W>;\n  /** @internal */\n  _writeRequests!: SimpleQueue<WriteRequest>;\n  /** @internal */\n  _inFlightWriteRequest: WriteRequest | undefined;\n  /** @internal */\n  _closeRequest: CloseRequest | undefined;\n  /** @internal */\n  _inFlightCloseRequest: CloseRequest | undefined;\n  /** @internal */\n  _pendingAbortRequest: PendingAbortRequest | undefined;\n  /** @internal */\n  _backpressure!: boolean;\n\n  constructor(underlyingSink?: UnderlyingSink<W>, strategy?: QueuingStrategy<W>);\n  constructor(rawUnderlyingSink: UnderlyingSink<W> | null | undefined = {},\n              rawStrategy: QueuingStrategy<W> | null | undefined = {}) {\n    if (rawUnderlyingSink === undefined) {\n      rawUnderlyingSink = null;\n    } else {\n      assertObject(rawUnderlyingSink, 'First parameter');\n    }\n\n    const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');\n    const underlyingSink = convertUnderlyingSink(rawUnderlyingSink, 'First parameter');\n\n    InitializeWritableStream(this);\n\n    const type = underlyingSink.type;\n    if (type !== undefined) {\n      throw new RangeError('Invalid type is specified');\n    }\n\n    const sizeAlgorithm = ExtractSizeAlgorithm(strategy);\n    const highWaterMark = ExtractHighWaterMark(strategy, 1);\n\n    SetUpWritableStreamDefaultControllerFromUnderlyingSink(this, underlyingSink, highWaterMark, sizeAlgorithm);\n  }\n\n  /**\n   * Returns whether or not the writable stream is locked to a writer.\n   */\n  get locked(): boolean {\n    if (!IsWritableStream(this)) {\n      throw streamBrandCheckException('locked');\n    }\n\n    return IsWritableStreamLocked(this);\n  }\n\n  /**\n   * Aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be\n   * immediately moved to an errored state, with any queued-up writes discarded. This will also execute any abort\n   * mechanism of the underlying sink.\n   *\n   * The returned promise will fulfill if the stream shuts down successfully, or reject if the underlying sink signaled\n   * that there was an error doing so. Additionally, it will reject with a `TypeError` (without attempting to cancel\n   * the stream) if the stream is currently locked.\n   */\n  abort(reason: any = undefined): Promise<void> {\n    if (!IsWritableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('abort'));\n    }\n\n    if (IsWritableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot abort a stream that already has a writer'));\n    }\n\n    return WritableStreamAbort(this, reason);\n  }\n\n  /**\n   * Closes the stream. The underlying sink will finish processing any previously-written chunks, before invoking its\n   * close behavior. During this time any further attempts to write will fail (without erroring the stream).\n   *\n   * The method returns a promise that will fulfill if all remaining chunks are successfully written and the stream\n   * successfully closes, or rejects if an error is encountered during this process. Additionally, it will reject with\n   * a `TypeError` (without attempting to cancel the stream) if the stream is currently locked.\n   */\n  close() {\n    if (!IsWritableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('close'));\n    }\n\n    if (IsWritableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot close a stream that already has a writer'));\n    }\n\n    if (WritableStreamCloseQueuedOrInFlight(this)) {\n      return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));\n    }\n\n    return WritableStreamClose(this);\n  }\n\n  /**\n   * Creates a {@link WritableStreamDefaultWriter | writer} and locks the stream to the new writer. While the stream\n   * is locked, no other writer can be acquired until this one is released.\n   *\n   * This functionality is especially useful for creating abstractions that desire the ability to write to a stream\n   * without interruption or interleaving. By getting a writer for the stream, you can ensure nobody else can write at\n   * the same time, which would cause the resulting written data to be unpredictable and probably useless.\n   */\n  getWriter(): WritableStreamDefaultWriter<W> {\n    if (!IsWritableStream(this)) {\n      throw streamBrandCheckException('getWriter');\n    }\n\n    return AcquireWritableStreamDefaultWriter(this);\n  }\n}\n\nObject.defineProperties(WritableStream.prototype, {\n  abort: { enumerable: true },\n  close: { enumerable: true },\n  getWriter: { enumerable: true },\n  locked: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStream.prototype, Symbol.toStringTag, {\n    value: 'WritableStream',\n    configurable: true\n  });\n}\n\nexport {\n  AcquireWritableStreamDefaultWriter,\n  CreateWritableStream,\n  IsWritableStream,\n  IsWritableStreamLocked,\n  WritableStream,\n  WritableStreamAbort,\n  WritableStreamDefaultControllerErrorIfNeeded,\n  WritableStreamDefaultWriterCloseWithErrorPropagation,\n  WritableStreamDefaultWriterRelease,\n  WritableStreamDefaultWriterWrite,\n  WritableStreamCloseQueuedOrInFlight,\n  UnderlyingSink,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkAbortCallback\n};\n\n// Abstract operations for the WritableStream.\n\nfunction AcquireWritableStreamDefaultWriter<W>(stream: WritableStream<W>): WritableStreamDefaultWriter<W> {\n  return new WritableStreamDefaultWriter(stream);\n}\n\n// Throws if and only if startAlgorithm throws.\nfunction CreateWritableStream<W>(startAlgorithm: () => void | PromiseLike<void>,\n                                 writeAlgorithm: (chunk: W) => Promise<void>,\n                                 closeAlgorithm: () => Promise<void>,\n                                 abortAlgorithm: (reason: any) => Promise<void>,\n                                 highWaterMark = 1,\n                                 sizeAlgorithm: QueuingStrategySizeCallback<W> = () => 1) {\n  assert(IsNonNegativeNumber(highWaterMark));\n\n  const stream: WritableStream<W> = Object.create(WritableStream.prototype);\n  InitializeWritableStream(stream);\n\n  const controller: WritableStreamDefaultController<W> = Object.create(WritableStreamDefaultController.prototype);\n\n  SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm,\n                                       abortAlgorithm, highWaterMark, sizeAlgorithm);\n  return stream;\n}\n\nfunction InitializeWritableStream<W>(stream: WritableStream<W>) {\n  stream._state = 'writable';\n\n  // The error that will be reported by new method calls once the state becomes errored. Only set when [[state]] is\n  // 'erroring' or 'errored'. May be set to an undefined value.\n  stream._storedError = undefined;\n\n  stream._writer = undefined;\n\n  // Initialize to undefined first because the constructor of the controller checks this\n  // variable to validate the caller.\n  stream._writableStreamController = undefined!;\n\n  // This queue is placed here instead of the writer class in order to allow for passing a writer to the next data\n  // producer without waiting for the queued writes to finish.\n  stream._writeRequests = new SimpleQueue();\n\n  // Write requests are removed from _writeRequests when write() is called on the underlying sink. This prevents\n  // them from being erroneously rejected on error. If a write() call is in-flight, the request is stored here.\n  stream._inFlightWriteRequest = undefined;\n\n  // The promise that was returned from writer.close(). Stored here because it may be fulfilled after the writer\n  // has been detached.\n  stream._closeRequest = undefined;\n\n  // Close request is removed from _closeRequest when close() is called on the underlying sink. This prevents it\n  // from being erroneously rejected on error. If a close() call is in-flight, the request is stored here.\n  stream._inFlightCloseRequest = undefined;\n\n  // The promise that was returned from writer.abort(). This may also be fulfilled after the writer has detached.\n  stream._pendingAbortRequest = undefined;\n\n  // The backpressure signal set by the controller.\n  stream._backpressure = false;\n}\n\nfunction IsWritableStream(x: unknown): x is WritableStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_writableStreamController')) {\n    return false;\n  }\n\n  return x instanceof WritableStream;\n}\n\nfunction IsWritableStreamLocked(stream: WritableStream): boolean {\n  assert(IsWritableStream(stream));\n\n  if (stream._writer === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamAbort(stream: WritableStream, reason: any): Promise<undefined> {\n  if (stream._state === 'closed' || stream._state === 'errored') {\n    return promiseResolvedWith(undefined);\n  }\n  stream._writableStreamController._abortReason = reason;\n  stream._writableStreamController._abortController?.abort();\n\n  // TypeScript narrows the type of `stream._state` down to 'writable' | 'erroring',\n  // but it doesn't know that signaling abort runs author code that might have changed the state.\n  // Widen the type again by casting to WritableStreamState.\n  const state = stream._state as WritableStreamState;\n\n  if (state === 'closed' || state === 'errored') {\n    return promiseResolvedWith(undefined);\n  }\n  if (stream._pendingAbortRequest !== undefined) {\n    return stream._pendingAbortRequest._promise;\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n\n  let wasAlreadyErroring = false;\n  if (state === 'erroring') {\n    wasAlreadyErroring = true;\n    // reason will not be used, so don't keep a reference to it.\n    reason = undefined;\n  }\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    stream._pendingAbortRequest = {\n      _promise: undefined!,\n      _resolve: resolve,\n      _reject: reject,\n      _reason: reason,\n      _wasAlreadyErroring: wasAlreadyErroring\n    };\n  });\n  stream._pendingAbortRequest!._promise = promise;\n\n  if (!wasAlreadyErroring) {\n    WritableStreamStartErroring(stream, reason);\n  }\n\n  return promise;\n}\n\nfunction WritableStreamClose(stream: WritableStream<any>): Promise<undefined> {\n  const state = stream._state;\n  if (state === 'closed' || state === 'errored') {\n    return promiseRejectedWith(new TypeError(\n      `The stream (in ${state} state) is not in the writable state and cannot be closed`));\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n  assert(!WritableStreamCloseQueuedOrInFlight(stream));\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    const closeRequest: CloseRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._closeRequest = closeRequest;\n  });\n\n  const writer = stream._writer;\n  if (writer !== undefined && stream._backpressure && state === 'writable') {\n    defaultWriterReadyPromiseResolve(writer);\n  }\n\n  WritableStreamDefaultControllerClose(stream._writableStreamController);\n\n  return promise;\n}\n\n// WritableStream API exposed for controllers.\n\nfunction WritableStreamAddWriteRequest(stream: WritableStream): Promise<undefined> {\n  assert(IsWritableStreamLocked(stream));\n  assert(stream._state === 'writable');\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    const writeRequest: WriteRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._writeRequests.push(writeRequest);\n  });\n\n  return promise;\n}\n\nfunction WritableStreamDealWithRejection(stream: WritableStream, error: any) {\n  const state = stream._state;\n\n  if (state === 'writable') {\n    WritableStreamStartErroring(stream, error);\n    return;\n  }\n\n  assert(state === 'erroring');\n  WritableStreamFinishErroring(stream);\n}\n\nfunction WritableStreamStartErroring(stream: WritableStream, reason: any) {\n  assert(stream._storedError === undefined);\n  assert(stream._state === 'writable');\n\n  const controller = stream._writableStreamController;\n  assert(controller !== undefined);\n\n  stream._state = 'erroring';\n  stream._storedError = reason;\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);\n  }\n\n  if (!WritableStreamHasOperationMarkedInFlight(stream) && controller._started) {\n    WritableStreamFinishErroring(stream);\n  }\n}\n\nfunction WritableStreamFinishErroring(stream: WritableStream) {\n  assert(stream._state === 'erroring');\n  assert(!WritableStreamHasOperationMarkedInFlight(stream));\n  stream._state = 'errored';\n  stream._writableStreamController[ErrorSteps]();\n\n  const storedError = stream._storedError;\n  stream._writeRequests.forEach(writeRequest => {\n    writeRequest._reject(storedError);\n  });\n  stream._writeRequests = new SimpleQueue();\n\n  if (stream._pendingAbortRequest === undefined) {\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    return;\n  }\n\n  const abortRequest = stream._pendingAbortRequest;\n  stream._pendingAbortRequest = undefined;\n\n  if (abortRequest._wasAlreadyErroring) {\n    abortRequest._reject(storedError);\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    return;\n  }\n\n  const promise = stream._writableStreamController[AbortSteps](abortRequest._reason);\n  uponPromise(\n    promise,\n    () => {\n      abortRequest._resolve();\n      WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    },\n    (reason: any) => {\n      abortRequest._reject(reason);\n      WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    });\n}\n\nfunction WritableStreamFinishInFlightWrite(stream: WritableStream) {\n  assert(stream._inFlightWriteRequest !== undefined);\n  stream._inFlightWriteRequest!._resolve(undefined);\n  stream._inFlightWriteRequest = undefined;\n}\n\nfunction WritableStreamFinishInFlightWriteWithError(stream: WritableStream, error: any) {\n  assert(stream._inFlightWriteRequest !== undefined);\n  stream._inFlightWriteRequest!._reject(error);\n  stream._inFlightWriteRequest = undefined;\n\n  assert(stream._state === 'writable' || stream._state === 'erroring');\n\n  WritableStreamDealWithRejection(stream, error);\n}\n\nfunction WritableStreamFinishInFlightClose(stream: WritableStream) {\n  assert(stream._inFlightCloseRequest !== undefined);\n  stream._inFlightCloseRequest!._resolve(undefined);\n  stream._inFlightCloseRequest = undefined;\n\n  const state = stream._state;\n\n  assert(state === 'writable' || state === 'erroring');\n\n  if (state === 'erroring') {\n    // The error was too late to do anything, so it is ignored.\n    stream._storedError = undefined;\n    if (stream._pendingAbortRequest !== undefined) {\n      stream._pendingAbortRequest._resolve();\n      stream._pendingAbortRequest = undefined;\n    }\n  }\n\n  stream._state = 'closed';\n\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    defaultWriterClosedPromiseResolve(writer);\n  }\n\n  assert(stream._pendingAbortRequest === undefined);\n  assert(stream._storedError === undefined);\n}\n\nfunction WritableStreamFinishInFlightCloseWithError(stream: WritableStream, error: any) {\n  assert(stream._inFlightCloseRequest !== undefined);\n  stream._inFlightCloseRequest!._reject(error);\n  stream._inFlightCloseRequest = undefined;\n\n  assert(stream._state === 'writable' || stream._state === 'erroring');\n\n  // Never execute sink abort() after sink close().\n  if (stream._pendingAbortRequest !== undefined) {\n    stream._pendingAbortRequest._reject(error);\n    stream._pendingAbortRequest = undefined;\n  }\n  WritableStreamDealWithRejection(stream, error);\n}\n\n// TODO(ricea): Fix alphabetical order.\nfunction WritableStreamCloseQueuedOrInFlight(stream: WritableStream): boolean {\n  if (stream._closeRequest === undefined && stream._inFlightCloseRequest === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamHasOperationMarkedInFlight(stream: WritableStream): boolean {\n  if (stream._inFlightWriteRequest === undefined && stream._inFlightCloseRequest === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamMarkCloseRequestInFlight(stream: WritableStream) {\n  assert(stream._inFlightCloseRequest === undefined);\n  assert(stream._closeRequest !== undefined);\n  stream._inFlightCloseRequest = stream._closeRequest;\n  stream._closeRequest = undefined;\n}\n\nfunction WritableStreamMarkFirstWriteRequestInFlight(stream: WritableStream) {\n  assert(stream._inFlightWriteRequest === undefined);\n  assert(stream._writeRequests.length !== 0);\n  stream._inFlightWriteRequest = stream._writeRequests.shift();\n}\n\nfunction WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream: WritableStream) {\n  assert(stream._state === 'errored');\n  if (stream._closeRequest !== undefined) {\n    assert(stream._inFlightCloseRequest === undefined);\n\n    stream._closeRequest._reject(stream._storedError);\n    stream._closeRequest = undefined;\n  }\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    defaultWriterClosedPromiseReject(writer, stream._storedError);\n  }\n}\n\nfunction WritableStreamUpdateBackpressure(stream: WritableStream, backpressure: boolean) {\n  assert(stream._state === 'writable');\n  assert(!WritableStreamCloseQueuedOrInFlight(stream));\n\n  const writer = stream._writer;\n  if (writer !== undefined && backpressure !== stream._backpressure) {\n    if (backpressure) {\n      defaultWriterReadyPromiseReset(writer);\n    } else {\n      assert(!backpressure);\n\n      defaultWriterReadyPromiseResolve(writer);\n    }\n  }\n\n  stream._backpressure = backpressure;\n}\n\n/**\n * A default writer vended by a {@link WritableStream}.\n *\n * @public\n */\nexport class WritableStreamDefaultWriter<W = any> {\n  /** @internal */\n  _ownerWritableStream: WritableStream<W>;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _closedPromiseState!: 'pending' | 'resolved' | 'rejected';\n  /** @internal */\n  _readyPromise!: Promise<undefined>;\n  /** @internal */\n  _readyPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _readyPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readyPromiseState!: 'pending' | 'fulfilled' | 'rejected';\n\n  constructor(stream: WritableStream<W>) {\n    assertRequiredArgument(stream, 1, 'WritableStreamDefaultWriter');\n    assertWritableStream(stream, 'First parameter');\n\n    if (IsWritableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive writing by another writer');\n    }\n\n    this._ownerWritableStream = stream;\n    stream._writer = this;\n\n    const state = stream._state;\n\n    if (state === 'writable') {\n      if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._backpressure) {\n        defaultWriterReadyPromiseInitialize(this);\n      } else {\n        defaultWriterReadyPromiseInitializeAsResolved(this);\n      }\n\n      defaultWriterClosedPromiseInitialize(this);\n    } else if (state === 'erroring') {\n      defaultWriterReadyPromiseInitializeAsRejected(this, stream._storedError);\n      defaultWriterClosedPromiseInitialize(this);\n    } else if (state === 'closed') {\n      defaultWriterReadyPromiseInitializeAsResolved(this);\n      defaultWriterClosedPromiseInitializeAsResolved(this);\n    } else {\n      assert(state === 'errored');\n\n      const storedError = stream._storedError;\n      defaultWriterReadyPromiseInitializeAsRejected(this, storedError);\n      defaultWriterClosedPromiseInitializeAsRejected(this, storedError);\n    }\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or\n   * the writer’s lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * Returns the desired size to fill the stream’s internal queue. It can be negative, if the queue is over-full.\n   * A producer can use this information to determine the right amount of data to write.\n   *\n   * It will be `null` if the stream cannot be successfully written to (due to either being errored, or having an abort\n   * queued up). It will return zero if the stream is closed. And the getter will throw an exception if invoked when\n   * the writer’s lock is released.\n   */\n  get desiredSize(): number | null {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      throw defaultWriterBrandCheckException('desiredSize');\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      throw defaultWriterLockException('desiredSize');\n    }\n\n    return WritableStreamDefaultWriterGetDesiredSize(this);\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the desired size to fill the stream’s internal queue transitions\n   * from non-positive to positive, signaling that it is no longer applying backpressure. Once the desired size dips\n   * back to zero or below, the getter will return a new promise that stays pending until the next transition.\n   *\n   * If the stream becomes errored or aborted, or the writer’s lock is released, the returned promise will become\n   * rejected.\n   */\n  get ready(): Promise<undefined> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('ready'));\n    }\n\n    return this._readyPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link WritableStream.abort | stream.abort(reason)}.\n   */\n  abort(reason: any = undefined): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('abort'));\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('abort'));\n    }\n\n    return WritableStreamDefaultWriterAbort(this, reason);\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link WritableStream.close | stream.close()}.\n   */\n  close(): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('close'));\n    }\n\n    const stream = this._ownerWritableStream;\n\n    if (stream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('close'));\n    }\n\n    if (WritableStreamCloseQueuedOrInFlight(stream)) {\n      return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));\n    }\n\n    return WritableStreamDefaultWriterClose(this);\n  }\n\n  /**\n   * Releases the writer’s lock on the corresponding stream. After the lock is released, the writer is no longer active.\n   * If the associated stream is errored when the lock is released, the writer will appear errored in the same way from\n   * now on; otherwise, the writer will appear closed.\n   *\n   * Note that the lock can still be released even if some ongoing writes have not yet finished (i.e. even if the\n   * promises returned from previous calls to {@link WritableStreamDefaultWriter.write | write()} have not yet settled).\n   * It’s not necessary to hold the lock on the writer for the duration of the write; the lock instead simply prevents\n   * other producers from writing in an interleaved manner.\n   */\n  releaseLock(): void {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      throw defaultWriterBrandCheckException('releaseLock');\n    }\n\n    const stream = this._ownerWritableStream;\n\n    if (stream === undefined) {\n      return;\n    }\n\n    assert(stream._writer !== undefined);\n\n    WritableStreamDefaultWriterRelease(this);\n  }\n\n  /**\n   * Writes the given chunk to the writable stream, by waiting until any previous writes have finished successfully,\n   * and then sending the chunk to the underlying sink's {@link UnderlyingSink.write | write()} method. It will return\n   * a promise that fulfills with undefined upon a successful write, or rejects if the write fails or stream becomes\n   * errored before the writing process is initiated.\n   *\n   * Note that what \"success\" means is up to the underlying sink; it might indicate simply that the chunk has been\n   * accepted, and not necessarily that it is safely saved to its ultimate destination.\n   */\n  write(chunk: W): Promise<void>;\n  write(chunk: W = undefined!): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('write'));\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('write to'));\n    }\n\n    return WritableStreamDefaultWriterWrite(this, chunk);\n  }\n}\n\nObject.defineProperties(WritableStreamDefaultWriter.prototype, {\n  abort: { enumerable: true },\n  close: { enumerable: true },\n  releaseLock: { enumerable: true },\n  write: { enumerable: true },\n  closed: { enumerable: true },\n  desiredSize: { enumerable: true },\n  ready: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStreamDefaultWriter.prototype, Symbol.toStringTag, {\n    value: 'WritableStreamDefaultWriter',\n    configurable: true\n  });\n}\n\n// Abstract operations for the WritableStreamDefaultWriter.\n\nfunction IsWritableStreamDefaultWriter<W = any>(x: any): x is WritableStreamDefaultWriter<W> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) {\n    return false;\n  }\n\n  return x instanceof WritableStreamDefaultWriter;\n}\n\n// A client of WritableStreamDefaultWriter may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultWriterAbort(writer: WritableStreamDefaultWriter, reason: any) {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  return WritableStreamAbort(stream, reason);\n}\n\nfunction WritableStreamDefaultWriterClose(writer: WritableStreamDefaultWriter): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  return WritableStreamClose(stream);\n}\n\nfunction WritableStreamDefaultWriterCloseWithErrorPropagation(writer: WritableStreamDefaultWriter): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  const state = stream._state;\n  if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {\n    return promiseResolvedWith(undefined);\n  }\n\n  if (state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n\n  return WritableStreamDefaultWriterClose(writer);\n}\n\nfunction WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer: WritableStreamDefaultWriter, error: any) {\n  if (writer._closedPromiseState === 'pending') {\n    defaultWriterClosedPromiseReject(writer, error);\n  } else {\n    defaultWriterClosedPromiseResetToRejected(writer, error);\n  }\n}\n\nfunction WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer: WritableStreamDefaultWriter, error: any) {\n  if (writer._readyPromiseState === 'pending') {\n    defaultWriterReadyPromiseReject(writer, error);\n  } else {\n    defaultWriterReadyPromiseResetToRejected(writer, error);\n  }\n}\n\nfunction WritableStreamDefaultWriterGetDesiredSize(writer: WritableStreamDefaultWriter): number | null {\n  const stream = writer._ownerWritableStream;\n  const state = stream._state;\n\n  if (state === 'errored' || state === 'erroring') {\n    return null;\n  }\n\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return WritableStreamDefaultControllerGetDesiredSize(stream._writableStreamController);\n}\n\nfunction WritableStreamDefaultWriterRelease(writer: WritableStreamDefaultWriter) {\n  const stream = writer._ownerWritableStream;\n  assert(stream !== undefined);\n  assert(stream._writer === writer);\n\n  const releasedError = new TypeError(\n    `Writer was released and can no longer be used to monitor the stream's closedness`);\n\n  WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, releasedError);\n\n  // The state transitions to \"errored\" before the sink abort() method runs, but the writer.closed promise is not\n  // rejected until afterwards. This means that simply testing state will not work.\n  WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, releasedError);\n\n  stream._writer = undefined;\n  writer._ownerWritableStream = undefined!;\n}\n\nfunction WritableStreamDefaultWriterWrite<W>(writer: WritableStreamDefaultWriter<W>, chunk: W): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  const controller = stream._writableStreamController;\n\n  const chunkSize = WritableStreamDefaultControllerGetChunkSize(controller, chunk);\n\n  if (stream !== writer._ownerWritableStream) {\n    return promiseRejectedWith(defaultWriterLockException('write to'));\n  }\n\n  const state = stream._state;\n  if (state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n  if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {\n    return promiseRejectedWith(new TypeError('The stream is closing or closed and cannot be written to'));\n  }\n  if (state === 'erroring') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  assert(state === 'writable');\n\n  const promise = WritableStreamAddWriteRequest(stream);\n\n  WritableStreamDefaultControllerWrite(controller, chunk, chunkSize);\n\n  return promise;\n}\n\nconst closeSentinel: unique symbol = {} as any;\n\ntype QueueRecord<W> = W | typeof closeSentinel;\n\n/**\n * Allows control of a {@link WritableStream | writable stream}'s state and internal queue.\n *\n * @public\n */\nexport class WritableStreamDefaultController<W = any> {\n  /** @internal */\n  _controlledWritableStream!: WritableStream<W>;\n  /** @internal */\n  _queue!: SimpleQueue<QueuePair<QueueRecord<W>>>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _abortReason: any;\n  /** @internal */\n  _abortController: AbortController | undefined;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _strategySizeAlgorithm!: QueuingStrategySizeCallback<W>;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _writeAlgorithm!: (chunk: W) => Promise<void>;\n  /** @internal */\n  _closeAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _abortAlgorithm!: (reason: any) => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * The reason which was passed to `WritableStream.abort(reason)` when the stream was aborted.\n   *\n   * @deprecated\n   *  This property has been removed from the specification, see https://github.com/whatwg/streams/pull/1177.\n   *  Use {@link WritableStreamDefaultController.signal}'s `reason` instead.\n   */\n  get abortReason(): any {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('abortReason');\n    }\n    return this._abortReason;\n  }\n\n  /**\n   * An `AbortSignal` that can be used to abort the pending write or close operation when the stream is aborted.\n   */\n  get signal(): AbortSignal {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('signal');\n    }\n    if (this._abortController === undefined) {\n      // Older browsers or older Node versions may not support `AbortController` or `AbortSignal`.\n      // We don't want to bundle and ship an `AbortController` polyfill together with our polyfill,\n      // so instead we only implement support for `signal` if we find a global `AbortController` constructor.\n      throw new TypeError('WritableStreamDefaultController.prototype.signal is not supported');\n    }\n    return this._abortController.signal;\n  }\n\n  /**\n   * Closes the controlled writable stream, making all future interactions with it fail with the given error `e`.\n   *\n   * This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying\n   * sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the\n   * normal lifecycle of interactions with the underlying sink.\n   */\n  error(e: any = undefined): void {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n    const state = this._controlledWritableStream._state;\n    if (state !== 'writable') {\n      // The stream is closed, errored or will be soon. The sink can't do anything useful if it gets an error here, so\n      // just treat it as a no-op.\n      return;\n    }\n\n    WritableStreamDefaultControllerError(this, e);\n  }\n\n  /** @internal */\n  [AbortSteps](reason: any): Promise<void> {\n    const result = this._abortAlgorithm(reason);\n    WritableStreamDefaultControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [ErrorSteps]() {\n    ResetQueue(this);\n  }\n}\n\nObject.defineProperties(WritableStreamDefaultController.prototype, {\n  abortReason: { enumerable: true },\n  signal: { enumerable: true },\n  error: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'WritableStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Abstract operations implementing interface required by the WritableStream.\n\nfunction IsWritableStreamDefaultController(x: any): x is WritableStreamDefaultController<any> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledWritableStream')) {\n    return false;\n  }\n\n  return x instanceof WritableStreamDefaultController;\n}\n\nfunction SetUpWritableStreamDefaultController<W>(stream: WritableStream<W>,\n                                                 controller: WritableStreamDefaultController<W>,\n                                                 startAlgorithm: () => void | PromiseLike<void>,\n                                                 writeAlgorithm: (chunk: W) => Promise<void>,\n                                                 closeAlgorithm: () => Promise<void>,\n                                                 abortAlgorithm: (reason: any) => Promise<void>,\n                                                 highWaterMark: number,\n                                                 sizeAlgorithm: QueuingStrategySizeCallback<W>) {\n  assert(IsWritableStream(stream));\n  assert(stream._writableStreamController === undefined);\n\n  controller._controlledWritableStream = stream;\n  stream._writableStreamController = controller;\n\n  // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n  controller._queue = undefined!;\n  controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._abortReason = undefined;\n  controller._abortController = createAbortController();\n  controller._started = false;\n\n  controller._strategySizeAlgorithm = sizeAlgorithm;\n  controller._strategyHWM = highWaterMark;\n\n  controller._writeAlgorithm = writeAlgorithm;\n  controller._closeAlgorithm = closeAlgorithm;\n  controller._abortAlgorithm = abortAlgorithm;\n\n  const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n  WritableStreamUpdateBackpressure(stream, backpressure);\n\n  const startResult = startAlgorithm();\n  const startPromise = promiseResolvedWith(startResult);\n  uponPromise(\n    startPromise,\n    () => {\n      assert(stream._state === 'writable' || stream._state === 'erroring');\n      controller._started = true;\n      WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n    },\n    r => {\n      assert(stream._state === 'writable' || stream._state === 'erroring');\n      controller._started = true;\n      WritableStreamDealWithRejection(stream, r);\n    }\n  );\n}\n\nfunction SetUpWritableStreamDefaultControllerFromUnderlyingSink<W>(stream: WritableStream<W>,\n                                                                   underlyingSink: ValidatedUnderlyingSink<W>,\n                                                                   highWaterMark: number,\n                                                                   sizeAlgorithm: QueuingStrategySizeCallback<W>) {\n  const controller = Object.create(WritableStreamDefaultController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let writeAlgorithm: (chunk: W) => Promise<void> = () => promiseResolvedWith(undefined);\n  let closeAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let abortAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingSink.start !== undefined) {\n    startAlgorithm = () => underlyingSink.start!(controller);\n  }\n  if (underlyingSink.write !== undefined) {\n    writeAlgorithm = chunk => underlyingSink.write!(chunk, controller);\n  }\n  if (underlyingSink.close !== undefined) {\n    closeAlgorithm = () => underlyingSink.close!();\n  }\n  if (underlyingSink.abort !== undefined) {\n    abortAlgorithm = reason => underlyingSink.abort!(reason);\n  }\n\n  SetUpWritableStreamDefaultController(\n    stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm\n  );\n}\n\n// ClearAlgorithms may be called twice. Erroring the same stream in multiple ways will often result in redundant calls.\nfunction WritableStreamDefaultControllerClearAlgorithms(controller: WritableStreamDefaultController<any>) {\n  controller._writeAlgorithm = undefined!;\n  controller._closeAlgorithm = undefined!;\n  controller._abortAlgorithm = undefined!;\n  controller._strategySizeAlgorithm = undefined!;\n}\n\nfunction WritableStreamDefaultControllerClose<W>(controller: WritableStreamDefaultController<W>) {\n  EnqueueValueWithSize(controller, closeSentinel, 0);\n  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\nfunction WritableStreamDefaultControllerGetChunkSize<W>(controller: WritableStreamDefaultController<W>,\n                                                        chunk: W): number {\n  try {\n    return controller._strategySizeAlgorithm(chunk);\n  } catch (chunkSizeE) {\n    WritableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE);\n    return 1;\n  }\n}\n\nfunction WritableStreamDefaultControllerGetDesiredSize(controller: WritableStreamDefaultController<any>): number {\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\nfunction WritableStreamDefaultControllerWrite<W>(controller: WritableStreamDefaultController<W>,\n                                                 chunk: W,\n                                                 chunkSize: number) {\n  try {\n    EnqueueValueWithSize(controller, chunk, chunkSize);\n  } catch (enqueueE) {\n    WritableStreamDefaultControllerErrorIfNeeded(controller, enqueueE);\n    return;\n  }\n\n  const stream = controller._controlledWritableStream;\n  if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._state === 'writable') {\n    const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n    WritableStreamUpdateBackpressure(stream, backpressure);\n  }\n\n  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\n// Abstract operations for the WritableStreamDefaultController.\n\nfunction WritableStreamDefaultControllerAdvanceQueueIfNeeded<W>(controller: WritableStreamDefaultController<W>) {\n  const stream = controller._controlledWritableStream;\n\n  if (!controller._started) {\n    return;\n  }\n\n  if (stream._inFlightWriteRequest !== undefined) {\n    return;\n  }\n\n  const state = stream._state;\n  assert(state !== 'closed' && state !== 'errored');\n  if (state === 'erroring') {\n    WritableStreamFinishErroring(stream);\n    return;\n  }\n\n  if (controller._queue.length === 0) {\n    return;\n  }\n\n  const value = PeekQueueValue(controller);\n  if (value === closeSentinel) {\n    WritableStreamDefaultControllerProcessClose(controller);\n  } else {\n    WritableStreamDefaultControllerProcessWrite(controller, value);\n  }\n}\n\nfunction WritableStreamDefaultControllerErrorIfNeeded(controller: WritableStreamDefaultController<any>, error: any) {\n  if (controller._controlledWritableStream._state === 'writable') {\n    WritableStreamDefaultControllerError(controller, error);\n  }\n}\n\nfunction WritableStreamDefaultControllerProcessClose(controller: WritableStreamDefaultController<any>) {\n  const stream = controller._controlledWritableStream;\n\n  WritableStreamMarkCloseRequestInFlight(stream);\n\n  DequeueValue(controller);\n  assert(controller._queue.length === 0);\n\n  const sinkClosePromise = controller._closeAlgorithm();\n  WritableStreamDefaultControllerClearAlgorithms(controller);\n  uponPromise(\n    sinkClosePromise,\n    () => {\n      WritableStreamFinishInFlightClose(stream);\n    },\n    reason => {\n      WritableStreamFinishInFlightCloseWithError(stream, reason);\n    }\n  );\n}\n\nfunction WritableStreamDefaultControllerProcessWrite<W>(controller: WritableStreamDefaultController<W>, chunk: W) {\n  const stream = controller._controlledWritableStream;\n\n  WritableStreamMarkFirstWriteRequestInFlight(stream);\n\n  const sinkWritePromise = controller._writeAlgorithm(chunk);\n  uponPromise(\n    sinkWritePromise,\n    () => {\n      WritableStreamFinishInFlightWrite(stream);\n\n      const state = stream._state;\n      assert(state === 'writable' || state === 'erroring');\n\n      DequeueValue(controller);\n\n      if (!WritableStreamCloseQueuedOrInFlight(stream) && state === 'writable') {\n        const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n        WritableStreamUpdateBackpressure(stream, backpressure);\n      }\n\n      WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n    },\n    reason => {\n      if (stream._state === 'writable') {\n        WritableStreamDefaultControllerClearAlgorithms(controller);\n      }\n      WritableStreamFinishInFlightWriteWithError(stream, reason);\n    }\n  );\n}\n\nfunction WritableStreamDefaultControllerGetBackpressure(controller: WritableStreamDefaultController<any>): boolean {\n  const desiredSize = WritableStreamDefaultControllerGetDesiredSize(controller);\n  return desiredSize <= 0;\n}\n\n// A client of WritableStreamDefaultController may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultControllerError(controller: WritableStreamDefaultController<any>, error: any) {\n  const stream = controller._controlledWritableStream;\n\n  assert(stream._state === 'writable');\n\n  WritableStreamDefaultControllerClearAlgorithms(controller);\n  WritableStreamStartErroring(stream, error);\n}\n\n// Helper functions for the WritableStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(`WritableStream.prototype.${name} can only be used on a WritableStream`);\n}\n\n// Helper functions for the WritableStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `WritableStreamDefaultController.prototype.${name} can only be used on a WritableStreamDefaultController`);\n}\n\n\n// Helper functions for the WritableStreamDefaultWriter.\n\nfunction defaultWriterBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `WritableStreamDefaultWriter.prototype.${name} can only be used on a WritableStreamDefaultWriter`);\n}\n\nfunction defaultWriterLockException(name: string): TypeError {\n  return new TypeError('Cannot ' + name + ' a stream using a released writer');\n}\n\nfunction defaultWriterClosedPromiseInitialize(writer: WritableStreamDefaultWriter) {\n  writer._closedPromise = newPromise((resolve, reject) => {\n    writer._closedPromise_resolve = resolve;\n    writer._closedPromise_reject = reject;\n    writer._closedPromiseState = 'pending';\n  });\n}\n\nfunction defaultWriterClosedPromiseInitializeAsRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  defaultWriterClosedPromiseInitialize(writer);\n  defaultWriterClosedPromiseReject(writer, reason);\n}\n\nfunction defaultWriterClosedPromiseInitializeAsResolved(writer: WritableStreamDefaultWriter) {\n  defaultWriterClosedPromiseInitialize(writer);\n  defaultWriterClosedPromiseResolve(writer);\n}\n\nfunction defaultWriterClosedPromiseReject(writer: WritableStreamDefaultWriter, reason: any) {\n  if (writer._closedPromise_reject === undefined) {\n    return;\n  }\n  assert(writer._closedPromiseState === 'pending');\n\n  setPromiseIsHandledToTrue(writer._closedPromise);\n  writer._closedPromise_reject(reason);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'rejected';\n}\n\nfunction defaultWriterClosedPromiseResetToRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  assert(writer._closedPromise_resolve === undefined);\n  assert(writer._closedPromise_reject === undefined);\n  assert(writer._closedPromiseState !== 'pending');\n\n  defaultWriterClosedPromiseInitializeAsRejected(writer, reason);\n}\n\nfunction defaultWriterClosedPromiseResolve(writer: WritableStreamDefaultWriter) {\n  if (writer._closedPromise_resolve === undefined) {\n    return;\n  }\n  assert(writer._closedPromiseState === 'pending');\n\n  writer._closedPromise_resolve(undefined);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'resolved';\n}\n\nfunction defaultWriterReadyPromiseInitialize(writer: WritableStreamDefaultWriter) {\n  writer._readyPromise = newPromise((resolve, reject) => {\n    writer._readyPromise_resolve = resolve;\n    writer._readyPromise_reject = reject;\n  });\n  writer._readyPromiseState = 'pending';\n}\n\nfunction defaultWriterReadyPromiseInitializeAsRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  defaultWriterReadyPromiseInitialize(writer);\n  defaultWriterReadyPromiseReject(writer, reason);\n}\n\nfunction defaultWriterReadyPromiseInitializeAsResolved(writer: WritableStreamDefaultWriter) {\n  defaultWriterReadyPromiseInitialize(writer);\n  defaultWriterReadyPromiseResolve(writer);\n}\n\nfunction defaultWriterReadyPromiseReject(writer: WritableStreamDefaultWriter, reason: any) {\n  if (writer._readyPromise_reject === undefined) {\n    return;\n  }\n\n  setPromiseIsHandledToTrue(writer._readyPromise);\n  writer._readyPromise_reject(reason);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'rejected';\n}\n\nfunction defaultWriterReadyPromiseReset(writer: WritableStreamDefaultWriter) {\n  assert(writer._readyPromise_resolve === undefined);\n  assert(writer._readyPromise_reject === undefined);\n\n  defaultWriterReadyPromiseInitialize(writer);\n}\n\nfunction defaultWriterReadyPromiseResetToRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  assert(writer._readyPromise_resolve === undefined);\n  assert(writer._readyPromise_reject === undefined);\n\n  defaultWriterReadyPromiseInitializeAsRejected(writer, reason);\n}\n\nfunction defaultWriterReadyPromiseResolve(writer: WritableStreamDefaultWriter) {\n  if (writer._readyPromise_resolve === undefined) {\n    return;\n  }\n\n  writer._readyPromise_resolve(undefined);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'fulfilled';\n}\n","/// <reference lib=\"dom\" />\nexport const NativeDOMException: typeof DOMException | undefined =\n  typeof DOMException !== 'undefined' ? DOMException : undefined;\n","/// <reference types=\"node\" />\nimport { NativeDOMException } from './native';\n\ndeclare class DOMExceptionClass extends Error {\n  constructor(message?: string, name?: string);\n\n  name: string;\n  message: string;\n}\n\ntype DOMException = DOMExceptionClass;\ntype DOMExceptionConstructor = typeof DOMExceptionClass;\n\nfunction isDOMExceptionConstructor(ctor: unknown): ctor is DOMExceptionConstructor {\n  if (!(typeof ctor === 'function' || typeof ctor === 'object')) {\n    return false;\n  }\n  try {\n    new (ctor as DOMExceptionConstructor)();\n    return true;\n  } catch {\n    return false;\n  }\n}\n\nfunction createDOMExceptionPolyfill(): DOMExceptionConstructor {\n  // eslint-disable-next-line no-shadow\n  const ctor = function DOMException(this: DOMException, message?: string, name?: string) {\n    this.message = message || '';\n    this.name = name || 'Error';\n    if (Error.captureStackTrace) {\n      Error.captureStackTrace(this, this.constructor);\n    }\n  } as any;\n  ctor.prototype = Object.create(Error.prototype);\n  Object.defineProperty(ctor.prototype, 'constructor', { value: ctor, writable: true, configurable: true });\n  return ctor;\n}\n\n// eslint-disable-next-line no-redeclare\nconst DOMException: DOMExceptionConstructor =\n  isDOMExceptionConstructor(NativeDOMException) ? NativeDOMException : createDOMExceptionPolyfill();\n\nexport { DOMException };\n","import { IsReadableStream, IsReadableStreamLocked, ReadableStream, ReadableStreamCancel } from '../readable-stream';\nimport { AcquireReadableStreamDefaultReader, ReadableStreamDefaultReaderRead } from './default-reader';\nimport { ReadableStreamReaderGenericRelease } from './generic-reader';\nimport {\n  AcquireWritableStreamDefaultWriter,\n  IsWritableStream,\n  IsWritableStreamLocked,\n  WritableStream,\n  WritableStreamAbort,\n  WritableStreamCloseQueuedOrInFlight,\n  WritableStreamDefaultWriterCloseWithErrorPropagation,\n  WritableStreamDefaultWriterRelease,\n  WritableStreamDefaultWriterWrite\n} from '../writable-stream';\nimport assert from '../../stub/assert';\nimport {\n  newPromise,\n  PerformPromiseThen,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  uponFulfillment,\n  uponPromise,\n  uponRejection\n} from '../helpers/webidl';\nimport { noop } from '../../utils';\nimport { AbortSignal, isAbortSignal } from '../abort-signal';\nimport { DOMException } from '../../stub/dom-exception';\n\nexport function ReadableStreamPipeTo<T>(source: ReadableStream<T>,\n                                        dest: WritableStream<T>,\n                                        preventClose: boolean,\n                                        preventAbort: boolean,\n                                        preventCancel: boolean,\n                                        signal: AbortSignal | undefined): Promise<undefined> {\n  assert(IsReadableStream(source));\n  assert(IsWritableStream(dest));\n  assert(typeof preventClose === 'boolean');\n  assert(typeof preventAbort === 'boolean');\n  assert(typeof preventCancel === 'boolean');\n  assert(signal === undefined || isAbortSignal(signal));\n  assert(!IsReadableStreamLocked(source));\n  assert(!IsWritableStreamLocked(dest));\n\n  const reader = AcquireReadableStreamDefaultReader<T>(source);\n  const writer = AcquireWritableStreamDefaultWriter<T>(dest);\n\n  source._disturbed = true;\n\n  let shuttingDown = false;\n\n  // This is used to keep track of the spec's requirement that we wait for ongoing writes during shutdown.\n  let currentWrite = promiseResolvedWith<void>(undefined);\n\n  return newPromise((resolve, reject) => {\n    let abortAlgorithm: () => void;\n    if (signal !== undefined) {\n      abortAlgorithm = () => {\n        const error = new DOMException('Aborted', 'AbortError');\n        const actions: Array<() => Promise<void>> = [];\n        if (!preventAbort) {\n          actions.push(() => {\n            if (dest._state === 'writable') {\n              return WritableStreamAbort(dest, error);\n            }\n            return promiseResolvedWith(undefined);\n          });\n        }\n        if (!preventCancel) {\n          actions.push(() => {\n            if (source._state === 'readable') {\n              return ReadableStreamCancel(source, error);\n            }\n            return promiseResolvedWith(undefined);\n          });\n        }\n        shutdownWithAction(() => Promise.all(actions.map(action => action())), true, error);\n      };\n\n      if (signal.aborted) {\n        abortAlgorithm();\n        return;\n      }\n\n      signal.addEventListener('abort', abortAlgorithm);\n    }\n\n    // Using reader and writer, read all chunks from this and write them to dest\n    // - Backpressure must be enforced\n    // - Shutdown must stop all activity\n    function pipeLoop() {\n      return newPromise<void>((resolveLoop, rejectLoop) => {\n        function next(done: boolean) {\n          if (done) {\n            resolveLoop();\n          } else {\n            // Use `PerformPromiseThen` instead of `uponPromise` to avoid\n            // adding unnecessary `.catch(rethrowAssertionErrorRejection)` handlers\n            PerformPromiseThen(pipeStep(), next, rejectLoop);\n          }\n        }\n\n        next(false);\n      });\n    }\n\n    function pipeStep(): Promise<boolean> {\n      if (shuttingDown) {\n        return promiseResolvedWith(true);\n      }\n\n      return PerformPromiseThen(writer._readyPromise, () => {\n        return newPromise<boolean>((resolveRead, rejectRead) => {\n          ReadableStreamDefaultReaderRead(\n            reader,\n            {\n              _chunkSteps: chunk => {\n                currentWrite = PerformPromiseThen(WritableStreamDefaultWriterWrite(writer, chunk), undefined, noop);\n                resolveRead(false);\n              },\n              _closeSteps: () => resolveRead(true),\n              _errorSteps: rejectRead\n            }\n          );\n        });\n      });\n    }\n\n    // Errors must be propagated forward\n    isOrBecomesErrored(source, reader._closedPromise, storedError => {\n      if (!preventAbort) {\n        shutdownWithAction(() => WritableStreamAbort(dest, storedError), true, storedError);\n      } else {\n        shutdown(true, storedError);\n      }\n    });\n\n    // Errors must be propagated backward\n    isOrBecomesErrored(dest, writer._closedPromise, storedError => {\n      if (!preventCancel) {\n        shutdownWithAction(() => ReadableStreamCancel(source, storedError), true, storedError);\n      } else {\n        shutdown(true, storedError);\n      }\n    });\n\n    // Closing must be propagated forward\n    isOrBecomesClosed(source, reader._closedPromise, () => {\n      if (!preventClose) {\n        shutdownWithAction(() => WritableStreamDefaultWriterCloseWithErrorPropagation(writer));\n      } else {\n        shutdown();\n      }\n    });\n\n    // Closing must be propagated backward\n    if (WritableStreamCloseQueuedOrInFlight(dest) || dest._state === 'closed') {\n      const destClosed = new TypeError('the destination writable stream closed before all data could be piped to it');\n\n      if (!preventCancel) {\n        shutdownWithAction(() => ReadableStreamCancel(source, destClosed), true, destClosed);\n      } else {\n        shutdown(true, destClosed);\n      }\n    }\n\n    setPromiseIsHandledToTrue(pipeLoop());\n\n    function waitForWritesToFinish(): Promise<void> {\n      // Another write may have started while we were waiting on this currentWrite, so we have to be sure to wait\n      // for that too.\n      const oldCurrentWrite = currentWrite;\n      return PerformPromiseThen(\n        currentWrite,\n        () => oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined\n      );\n    }\n\n    function isOrBecomesErrored(stream: ReadableStream | WritableStream,\n                                promise: Promise<void>,\n                                action: (reason: any) => void) {\n      if (stream._state === 'errored') {\n        action(stream._storedError);\n      } else {\n        uponRejection(promise, action);\n      }\n    }\n\n    function isOrBecomesClosed(stream: ReadableStream | WritableStream, promise: Promise<void>, action: () => void) {\n      if (stream._state === 'closed') {\n        action();\n      } else {\n        uponFulfillment(promise, action);\n      }\n    }\n\n    function shutdownWithAction(action: () => Promise<unknown>, originalIsError?: boolean, originalError?: any) {\n      if (shuttingDown) {\n        return;\n      }\n      shuttingDown = true;\n\n      if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {\n        uponFulfillment(waitForWritesToFinish(), doTheRest);\n      } else {\n        doTheRest();\n      }\n\n      function doTheRest() {\n        uponPromise(\n          action(),\n          () => finalize(originalIsError, originalError),\n          newError => finalize(true, newError)\n        );\n      }\n    }\n\n    function shutdown(isError?: boolean, error?: any) {\n      if (shuttingDown) {\n        return;\n      }\n      shuttingDown = true;\n\n      if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {\n        uponFulfillment(waitForWritesToFinish(), () => finalize(isError, error));\n      } else {\n        finalize(isError, error);\n      }\n    }\n\n    function finalize(isError?: boolean, error?: any) {\n      WritableStreamDefaultWriterRelease(writer);\n      ReadableStreamReaderGenericRelease(reader);\n\n      if (signal !== undefined) {\n        signal.removeEventListener('abort', abortAlgorithm);\n      }\n      if (isError) {\n        reject(error);\n      } else {\n        resolve(undefined);\n      }\n    }\n  });\n}\n","import { QueuingStrategySizeCallback } from '../queuing-strategy';\nimport assert from '../../stub/assert';\nimport { DequeueValue, EnqueueValueWithSize, QueuePair, ResetQueue } from '../abstract-ops/queue-with-sizes';\nimport {\n  ReadableStreamAddReadRequest,\n  ReadableStreamFulfillReadRequest,\n  ReadableStreamGetNumReadRequests,\n  ReadRequest\n} from './default-reader';\nimport { SimpleQueue } from '../simple-queue';\nimport { IsReadableStreamLocked, ReadableStream, ReadableStreamClose, ReadableStreamError } from '../readable-stream';\nimport { ValidatedUnderlyingSource } from './underlying-source';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { CancelSteps, PullSteps } from '../abstract-ops/internal-methods';\nimport { promiseResolvedWith, uponPromise } from '../helpers/webidl';\n\n/**\n * Allows control of a {@link ReadableStream | readable stream}'s state and internal queue.\n *\n * @public\n */\nexport class ReadableStreamDefaultController<R> {\n  /** @internal */\n  _controlledReadableStream!: ReadableStream<R>;\n  /** @internal */\n  _queue!: SimpleQueue<QueuePair<R>>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _closeRequested!: boolean;\n  /** @internal */\n  _pullAgain!: boolean;\n  /** @internal */\n  _pulling !: boolean;\n  /** @internal */\n  _strategySizeAlgorithm!: QueuingStrategySizeCallback<R>;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _pullAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _cancelAlgorithm!: (reason: any) => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is\n   * over-full. An underlying source ought to use this information to determine when and how to apply backpressure.\n   */\n  get desiredSize(): number | null {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('desiredSize');\n    }\n\n    return ReadableStreamDefaultControllerGetDesiredSize(this);\n  }\n\n  /**\n   * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from\n   * the stream, but once those are read, the stream will become closed.\n   */\n  close(): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('close');\n    }\n\n    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {\n      throw new TypeError('The stream is not in a state that permits close');\n    }\n\n    ReadableStreamDefaultControllerClose(this);\n  }\n\n  /**\n   * Enqueues the given chunk `chunk` in the controlled readable stream.\n   */\n  enqueue(chunk: R): void;\n  enqueue(chunk: R = undefined!): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('enqueue');\n    }\n\n    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {\n      throw new TypeError('The stream is not in a state that permits enqueue');\n    }\n\n    return ReadableStreamDefaultControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.\n   */\n  error(e: any = undefined): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n\n    ReadableStreamDefaultControllerError(this, e);\n  }\n\n  /** @internal */\n  [CancelSteps](reason: any): Promise<void> {\n    ResetQueue(this);\n    const result = this._cancelAlgorithm(reason);\n    ReadableStreamDefaultControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [PullSteps](readRequest: ReadRequest<R>): void {\n    const stream = this._controlledReadableStream;\n\n    if (this._queue.length > 0) {\n      const chunk = DequeueValue(this);\n\n      if (this._closeRequested && this._queue.length === 0) {\n        ReadableStreamDefaultControllerClearAlgorithms(this);\n        ReadableStreamClose(stream);\n      } else {\n        ReadableStreamDefaultControllerCallPullIfNeeded(this);\n      }\n\n      readRequest._chunkSteps(chunk);\n    } else {\n      ReadableStreamAddReadRequest(stream, readRequest);\n      ReadableStreamDefaultControllerCallPullIfNeeded(this);\n    }\n  }\n}\n\nObject.defineProperties(ReadableStreamDefaultController.prototype, {\n  close: { enumerable: true },\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Abstract operations for the ReadableStreamDefaultController.\n\nfunction IsReadableStreamDefaultController<R = any>(x: any): x is ReadableStreamDefaultController<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableStream')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamDefaultController;\n}\n\nfunction ReadableStreamDefaultControllerCallPullIfNeeded(controller: ReadableStreamDefaultController<any>): void {\n  const shouldPull = ReadableStreamDefaultControllerShouldCallPull(controller);\n  if (!shouldPull) {\n    return;\n  }\n\n  if (controller._pulling) {\n    controller._pullAgain = true;\n    return;\n  }\n\n  assert(!controller._pullAgain);\n\n  controller._pulling = true;\n\n  const pullPromise = controller._pullAlgorithm();\n  uponPromise(\n    pullPromise,\n    () => {\n      controller._pulling = false;\n\n      if (controller._pullAgain) {\n        controller._pullAgain = false;\n        ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n      }\n    },\n    e => {\n      ReadableStreamDefaultControllerError(controller, e);\n    }\n  );\n}\n\nfunction ReadableStreamDefaultControllerShouldCallPull(controller: ReadableStreamDefaultController<any>): boolean {\n  const stream = controller._controlledReadableStream;\n\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return false;\n  }\n\n  if (!controller._started) {\n    return false;\n  }\n\n  if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    return true;\n  }\n\n  const desiredSize = ReadableStreamDefaultControllerGetDesiredSize(controller);\n  assert(desiredSize !== null);\n  if (desiredSize! > 0) {\n    return true;\n  }\n\n  return false;\n}\n\nfunction ReadableStreamDefaultControllerClearAlgorithms(controller: ReadableStreamDefaultController<any>) {\n  controller._pullAlgorithm = undefined!;\n  controller._cancelAlgorithm = undefined!;\n  controller._strategySizeAlgorithm = undefined!;\n}\n\n// A client of ReadableStreamDefaultController may use these functions directly to bypass state check.\n\nexport function ReadableStreamDefaultControllerClose(controller: ReadableStreamDefaultController<any>) {\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return;\n  }\n\n  const stream = controller._controlledReadableStream;\n\n  controller._closeRequested = true;\n\n  if (controller._queue.length === 0) {\n    ReadableStreamDefaultControllerClearAlgorithms(controller);\n    ReadableStreamClose(stream);\n  }\n}\n\nexport function ReadableStreamDefaultControllerEnqueue<R>(\n  controller: ReadableStreamDefaultController<R>,\n  chunk: R\n): void {\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return;\n  }\n\n  const stream = controller._controlledReadableStream;\n\n  if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    ReadableStreamFulfillReadRequest(stream, chunk, false);\n  } else {\n    let chunkSize;\n    try {\n      chunkSize = controller._strategySizeAlgorithm(chunk);\n    } catch (chunkSizeE) {\n      ReadableStreamDefaultControllerError(controller, chunkSizeE);\n      throw chunkSizeE;\n    }\n\n    try {\n      EnqueueValueWithSize(controller, chunk, chunkSize);\n    } catch (enqueueE) {\n      ReadableStreamDefaultControllerError(controller, enqueueE);\n      throw enqueueE;\n    }\n  }\n\n  ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n}\n\nexport function ReadableStreamDefaultControllerError(controller: ReadableStreamDefaultController<any>, e: any) {\n  const stream = controller._controlledReadableStream;\n\n  if (stream._state !== 'readable') {\n    return;\n  }\n\n  ResetQueue(controller);\n\n  ReadableStreamDefaultControllerClearAlgorithms(controller);\n  ReadableStreamError(stream, e);\n}\n\nexport function ReadableStreamDefaultControllerGetDesiredSize(\n  controller: ReadableStreamDefaultController<any>\n): number | null {\n  const state = controller._controlledReadableStream._state;\n\n  if (state === 'errored') {\n    return null;\n  }\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\n// This is used in the implementation of TransformStream.\nexport function ReadableStreamDefaultControllerHasBackpressure(\n  controller: ReadableStreamDefaultController<any>\n): boolean {\n  if (ReadableStreamDefaultControllerShouldCallPull(controller)) {\n    return false;\n  }\n\n  return true;\n}\n\nexport function ReadableStreamDefaultControllerCanCloseOrEnqueue(\n  controller: ReadableStreamDefaultController<any>\n): boolean {\n  const state = controller._controlledReadableStream._state;\n\n  if (!controller._closeRequested && state === 'readable') {\n    return true;\n  }\n\n  return false;\n}\n\nexport function SetUpReadableStreamDefaultController<R>(stream: ReadableStream<R>,\n                                                        controller: ReadableStreamDefaultController<R>,\n                                                        startAlgorithm: () => void | PromiseLike<void>,\n                                                        pullAlgorithm: () => Promise<void>,\n                                                        cancelAlgorithm: (reason: any) => Promise<void>,\n                                                        highWaterMark: number,\n                                                        sizeAlgorithm: QueuingStrategySizeCallback<R>) {\n  assert(stream._readableStreamController === undefined);\n\n  controller._controlledReadableStream = stream;\n\n  controller._queue = undefined!;\n  controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._started = false;\n  controller._closeRequested = false;\n  controller._pullAgain = false;\n  controller._pulling = false;\n\n  controller._strategySizeAlgorithm = sizeAlgorithm;\n  controller._strategyHWM = highWaterMark;\n\n  controller._pullAlgorithm = pullAlgorithm;\n  controller._cancelAlgorithm = cancelAlgorithm;\n\n  stream._readableStreamController = controller;\n\n  const startResult = startAlgorithm();\n  uponPromise(\n    promiseResolvedWith(startResult),\n    () => {\n      controller._started = true;\n\n      assert(!controller._pulling);\n      assert(!controller._pullAgain);\n\n      ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n    },\n    r => {\n      ReadableStreamDefaultControllerError(controller, r);\n    }\n  );\n}\n\nexport function SetUpReadableStreamDefaultControllerFromUnderlyingSource<R>(\n  stream: ReadableStream<R>,\n  underlyingSource: ValidatedUnderlyingSource<R>,\n  highWaterMark: number,\n  sizeAlgorithm: QueuingStrategySizeCallback<R>\n) {\n  const controller: ReadableStreamDefaultController<R> = Object.create(ReadableStreamDefaultController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let pullAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let cancelAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingSource.start !== undefined) {\n    startAlgorithm = () => underlyingSource.start!(controller);\n  }\n  if (underlyingSource.pull !== undefined) {\n    pullAlgorithm = () => underlyingSource.pull!(controller);\n  }\n  if (underlyingSource.cancel !== undefined) {\n    cancelAlgorithm = reason => underlyingSource.cancel!(reason);\n  }\n\n  SetUpReadableStreamDefaultController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm\n  );\n}\n\n// Helper functions for the ReadableStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamDefaultController.prototype.${name} can only be used on a ReadableStreamDefaultController`);\n}\n","import {\n  CreateReadableByteStream,\n  CreateReadableStream,\n  IsReadableStream,\n  ReadableByteStream,\n  ReadableStream,\n  ReadableStreamCancel,\n  ReadableStreamReader\n} from '../readable-stream';\nimport { ReadableStreamReaderGenericRelease } from './generic-reader';\nimport {\n  AcquireReadableStreamDefaultReader,\n  IsReadableStreamDefaultReader,\n  ReadableStreamDefaultReaderRead,\n  ReadRequest\n} from './default-reader';\nimport {\n  AcquireReadableStreamBYOBReader,\n  IsReadableStreamBYOBReader,\n  ReadableStreamBYOBReaderRead,\n  ReadIntoRequest\n} from './byob-reader';\nimport assert from '../../stub/assert';\nimport { newPromise, promiseResolvedWith, queueMicrotask, uponRejection } from '../helpers/webidl';\nimport {\n  ReadableStreamDefaultController,\n  ReadableStreamDefaultControllerClose,\n  ReadableStreamDefaultControllerEnqueue,\n  ReadableStreamDefaultControllerError\n} from './default-controller';\nimport {\n  IsReadableByteStreamController,\n  ReadableByteStreamControllerClose,\n  ReadableByteStreamControllerEnqueue,\n  ReadableByteStreamControllerError,\n  ReadableByteStreamControllerGetBYOBRequest,\n  ReadableByteStreamControllerRespond,\n  ReadableByteStreamControllerRespondWithNewView\n} from './byte-stream-controller';\nimport { CreateArrayFromList } from '../abstract-ops/ecmascript';\nimport { CloneAsUint8Array } from '../abstract-ops/miscellaneous';\n\nexport function ReadableStreamTee<R>(stream: ReadableStream<R>,\n                                     cloneForBranch2: boolean): [ReadableStream<R>, ReadableStream<R>] {\n  assert(IsReadableStream(stream));\n  assert(typeof cloneForBranch2 === 'boolean');\n  if (IsReadableByteStreamController(stream._readableStreamController)) {\n    return ReadableByteStreamTee(stream as unknown as ReadableByteStream) as\n      unknown as [ReadableStream<R>, ReadableStream<R>];\n  }\n  return ReadableStreamDefaultTee(stream, cloneForBranch2);\n}\n\nexport function ReadableStreamDefaultTee<R>(stream: ReadableStream<R>,\n                                            cloneForBranch2: boolean): [ReadableStream<R>, ReadableStream<R>] {\n  assert(IsReadableStream(stream));\n  assert(typeof cloneForBranch2 === 'boolean');\n\n  const reader = AcquireReadableStreamDefaultReader<R>(stream);\n\n  let reading = false;\n  let readAgain = false;\n  let canceled1 = false;\n  let canceled2 = false;\n  let reason1: any;\n  let reason2: any;\n  let branch1: ReadableStream<R>;\n  let branch2: ReadableStream<R>;\n\n  let resolveCancelPromise: (value: undefined | Promise<undefined>) => void;\n  const cancelPromise = newPromise<undefined>(resolve => {\n    resolveCancelPromise = resolve;\n  });\n\n  function pullAlgorithm(): Promise<void> {\n    if (reading) {\n      readAgain = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgain = false;\n          const chunk1 = chunk;\n          const chunk2 = chunk;\n\n          // There is no way to access the cloning code right now in the reference implementation.\n          // If we add one then we'll need an implementation for serializable objects.\n          // if (!canceled2 && cloneForBranch2) {\n          //   chunk2 = StructuredDeserialize(StructuredSerialize(chunk2));\n          // }\n\n          if (!canceled1) {\n            ReadableStreamDefaultControllerEnqueue(\n              branch1._readableStreamController as ReadableStreamDefaultController<R>,\n              chunk1\n            );\n          }\n          if (!canceled2) {\n            ReadableStreamDefaultControllerEnqueue(\n              branch2._readableStreamController as ReadableStreamDefaultController<R>,\n              chunk2\n            );\n          }\n\n          reading = false;\n          if (readAgain) {\n            pullAlgorithm();\n          }\n        });\n      },\n      _closeSteps: () => {\n        reading = false;\n        if (!canceled1) {\n          ReadableStreamDefaultControllerClose(branch1._readableStreamController as ReadableStreamDefaultController<R>);\n        }\n        if (!canceled2) {\n          ReadableStreamDefaultControllerClose(branch2._readableStreamController as ReadableStreamDefaultController<R>);\n        }\n\n        if (!canceled1 || !canceled2) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function cancel1Algorithm(reason: any): Promise<void> {\n    canceled1 = true;\n    reason1 = reason;\n    if (canceled2) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function cancel2Algorithm(reason: any): Promise<void> {\n    canceled2 = true;\n    reason2 = reason;\n    if (canceled1) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function startAlgorithm() {\n    // do nothing\n  }\n\n  branch1 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel1Algorithm);\n  branch2 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel2Algorithm);\n\n  uponRejection(reader._closedPromise, (r: any) => {\n    ReadableStreamDefaultControllerError(branch1._readableStreamController as ReadableStreamDefaultController<R>, r);\n    ReadableStreamDefaultControllerError(branch2._readableStreamController as ReadableStreamDefaultController<R>, r);\n    if (!canceled1 || !canceled2) {\n      resolveCancelPromise(undefined);\n    }\n  });\n\n  return [branch1, branch2];\n}\n\nexport function ReadableByteStreamTee(stream: ReadableByteStream): [ReadableByteStream, ReadableByteStream] {\n  assert(IsReadableStream(stream));\n  assert(IsReadableByteStreamController(stream._readableStreamController));\n\n  let reader: ReadableStreamReader<Uint8Array> = AcquireReadableStreamDefaultReader(stream);\n  let reading = false;\n  let readAgainForBranch1 = false;\n  let readAgainForBranch2 = false;\n  let canceled1 = false;\n  let canceled2 = false;\n  let reason1: any;\n  let reason2: any;\n  let branch1: ReadableByteStream;\n  let branch2: ReadableByteStream;\n\n  let resolveCancelPromise: (value: undefined | Promise<undefined>) => void;\n  const cancelPromise = newPromise<void>(resolve => {\n    resolveCancelPromise = resolve;\n  });\n\n  function forwardReaderError(thisReader: ReadableStreamReader<Uint8Array>) {\n    uponRejection(thisReader._closedPromise, r => {\n      if (thisReader !== reader) {\n        return;\n      }\n      ReadableByteStreamControllerError(branch1._readableStreamController, r);\n      ReadableByteStreamControllerError(branch2._readableStreamController, r);\n      if (!canceled1 || !canceled2) {\n        resolveCancelPromise(undefined);\n      }\n    });\n  }\n\n  function pullWithDefaultReader() {\n    if (IsReadableStreamBYOBReader(reader)) {\n      assert(reader._readIntoRequests.length === 0);\n      ReadableStreamReaderGenericRelease(reader);\n\n      reader = AcquireReadableStreamDefaultReader(stream);\n      forwardReaderError(reader);\n    }\n\n    const readRequest: ReadRequest<Uint8Array> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgainForBranch1 = false;\n          readAgainForBranch2 = false;\n\n          const chunk1 = chunk;\n          let chunk2 = chunk;\n          if (!canceled1 && !canceled2) {\n            try {\n              chunk2 = CloneAsUint8Array(chunk);\n            } catch (cloneE) {\n              ReadableByteStreamControllerError(branch1._readableStreamController, cloneE);\n              ReadableByteStreamControllerError(branch2._readableStreamController, cloneE);\n              resolveCancelPromise(ReadableStreamCancel(stream, cloneE));\n              return;\n            }\n          }\n\n          if (!canceled1) {\n            ReadableByteStreamControllerEnqueue(branch1._readableStreamController, chunk1);\n          }\n          if (!canceled2) {\n            ReadableByteStreamControllerEnqueue(branch2._readableStreamController, chunk2);\n          }\n\n          reading = false;\n          if (readAgainForBranch1) {\n            pull1Algorithm();\n          } else if (readAgainForBranch2) {\n            pull2Algorithm();\n          }\n        });\n      },\n      _closeSteps: () => {\n        reading = false;\n        if (!canceled1) {\n          ReadableByteStreamControllerClose(branch1._readableStreamController);\n        }\n        if (!canceled2) {\n          ReadableByteStreamControllerClose(branch2._readableStreamController);\n        }\n        if (branch1._readableStreamController._pendingPullIntos.length > 0) {\n          ReadableByteStreamControllerRespond(branch1._readableStreamController, 0);\n        }\n        if (branch2._readableStreamController._pendingPullIntos.length > 0) {\n          ReadableByteStreamControllerRespond(branch2._readableStreamController, 0);\n        }\n        if (!canceled1 || !canceled2) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n  }\n\n  function pullWithBYOBReader(view: ArrayBufferView, forBranch2: boolean) {\n    if (IsReadableStreamDefaultReader<Uint8Array>(reader)) {\n      assert(reader._readRequests.length === 0);\n      ReadableStreamReaderGenericRelease(reader);\n\n      reader = AcquireReadableStreamBYOBReader(stream);\n      forwardReaderError(reader);\n    }\n\n    const byobBranch = forBranch2 ? branch2 : branch1;\n    const otherBranch = forBranch2 ? branch1 : branch2;\n\n    const readIntoRequest: ReadIntoRequest<ArrayBufferView> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgainForBranch1 = false;\n          readAgainForBranch2 = false;\n\n          const byobCanceled = forBranch2 ? canceled2 : canceled1;\n          const otherCanceled = forBranch2 ? canceled1 : canceled2;\n\n          if (!otherCanceled) {\n            let clonedChunk;\n            try {\n              clonedChunk = CloneAsUint8Array(chunk);\n            } catch (cloneE) {\n              ReadableByteStreamControllerError(byobBranch._readableStreamController, cloneE);\n              ReadableByteStreamControllerError(otherBranch._readableStreamController, cloneE);\n              resolveCancelPromise(ReadableStreamCancel(stream, cloneE));\n              return;\n            }\n            if (!byobCanceled) {\n              ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n            }\n            ReadableByteStreamControllerEnqueue(otherBranch._readableStreamController, clonedChunk);\n          } else if (!byobCanceled) {\n            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n          }\n\n          reading = false;\n          if (readAgainForBranch1) {\n            pull1Algorithm();\n          } else if (readAgainForBranch2) {\n            pull2Algorithm();\n          }\n        });\n      },\n      _closeSteps: chunk => {\n        reading = false;\n\n        const byobCanceled = forBranch2 ? canceled2 : canceled1;\n        const otherCanceled = forBranch2 ? canceled1 : canceled2;\n\n        if (!byobCanceled) {\n          ReadableByteStreamControllerClose(byobBranch._readableStreamController);\n        }\n        if (!otherCanceled) {\n          ReadableByteStreamControllerClose(otherBranch._readableStreamController);\n        }\n\n        if (chunk !== undefined) {\n          assert(chunk.byteLength === 0);\n\n          if (!byobCanceled) {\n            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n          }\n          if (!otherCanceled && otherBranch._readableStreamController._pendingPullIntos.length > 0) {\n            ReadableByteStreamControllerRespond(otherBranch._readableStreamController, 0);\n          }\n        }\n\n        if (!byobCanceled || !otherCanceled) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamBYOBReaderRead(reader, view, readIntoRequest);\n  }\n\n  function pull1Algorithm(): Promise<void> {\n    if (reading) {\n      readAgainForBranch1 = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch1._readableStreamController);\n    if (byobRequest === null) {\n      pullWithDefaultReader();\n    } else {\n      pullWithBYOBReader(byobRequest._view!, false);\n    }\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function pull2Algorithm(): Promise<void> {\n    if (reading) {\n      readAgainForBranch2 = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch2._readableStreamController);\n    if (byobRequest === null) {\n      pullWithDefaultReader();\n    } else {\n      pullWithBYOBReader(byobRequest._view!, true);\n    }\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function cancel1Algorithm(reason: any): Promise<void> {\n    canceled1 = true;\n    reason1 = reason;\n    if (canceled2) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function cancel2Algorithm(reason: any): Promise<void> {\n    canceled2 = true;\n    reason2 = reason;\n    if (canceled1) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function startAlgorithm(): void {\n    return;\n  }\n\n  branch1 = CreateReadableByteStream(startAlgorithm, pull1Algorithm, cancel1Algorithm);\n  branch2 = CreateReadableByteStream(startAlgorithm, pull2Algorithm, cancel2Algorithm);\n\n  forwardReaderError(reader);\n\n  return [branch1, branch2];\n}\n","import { assertDictionary, assertFunction, convertUnsignedLongLongWithEnforceRange } from './basic';\nimport {\n  ReadableStreamController,\n  UnderlyingByteSource,\n  UnderlyingDefaultOrByteSource,\n  UnderlyingDefaultOrByteSourcePullCallback,\n  UnderlyingDefaultOrByteSourceStartCallback,\n  UnderlyingSource,\n  UnderlyingSourceCancelCallback,\n  ValidatedUnderlyingDefaultOrByteSource\n} from '../readable-stream/underlying-source';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\n\nexport function convertUnderlyingDefaultOrByteSource<R>(\n  source: UnderlyingSource<R> | UnderlyingByteSource | null,\n  context: string\n): ValidatedUnderlyingDefaultOrByteSource<R> {\n  assertDictionary(source, context);\n  const original = source as (UnderlyingDefaultOrByteSource<R> | null);\n  const autoAllocateChunkSize = original?.autoAllocateChunkSize;\n  const cancel = original?.cancel;\n  const pull = original?.pull;\n  const start = original?.start;\n  const type = original?.type;\n  return {\n    autoAllocateChunkSize: autoAllocateChunkSize === undefined ?\n      undefined :\n      convertUnsignedLongLongWithEnforceRange(\n        autoAllocateChunkSize,\n        `${context} has member 'autoAllocateChunkSize' that`\n      ),\n    cancel: cancel === undefined ?\n      undefined :\n      convertUnderlyingSourceCancelCallback(cancel, original!, `${context} has member 'cancel' that`),\n    pull: pull === undefined ?\n      undefined :\n      convertUnderlyingSourcePullCallback(pull, original!, `${context} has member 'pull' that`),\n    start: start === undefined ?\n      undefined :\n      convertUnderlyingSourceStartCallback(start, original!, `${context} has member 'start' that`),\n    type: type === undefined ? undefined : convertReadableStreamType(type, `${context} has member 'type' that`)\n  };\n}\n\nfunction convertUnderlyingSourceCancelCallback(\n  fn: UnderlyingSourceCancelCallback,\n  original: UnderlyingDefaultOrByteSource,\n  context: string\n): (reason: any) => Promise<void> {\n  assertFunction(fn, context);\n  return (reason: any) => promiseCall(fn, original, [reason]);\n}\n\nfunction convertUnderlyingSourcePullCallback<R>(\n  fn: UnderlyingDefaultOrByteSourcePullCallback<R>,\n  original: UnderlyingDefaultOrByteSource<R>,\n  context: string\n): (controller: ReadableStreamController<R>) => Promise<void> {\n  assertFunction(fn, context);\n  return (controller: ReadableStreamController<R>) => promiseCall(fn, original, [controller]);\n}\n\nfunction convertUnderlyingSourceStartCallback<R>(\n  fn: UnderlyingDefaultOrByteSourceStartCallback<R>,\n  original: UnderlyingDefaultOrByteSource<R>,\n  context: string\n): UnderlyingDefaultOrByteSourceStartCallback<R> {\n  assertFunction(fn, context);\n  return (controller: ReadableStreamController<R>) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertReadableStreamType(type: string, context: string): 'bytes' {\n  type = `${type}`;\n  if (type !== 'bytes') {\n    throw new TypeError(`${context} '${type}' is not a valid enumeration value for ReadableStreamType`);\n  }\n  return type;\n}\n","import { assertDictionary } from './basic';\nimport { ReadableStreamGetReaderOptions } from '../readable-stream/reader-options';\n\nexport function convertReaderOptions(options: ReadableStreamGetReaderOptions | null | undefined,\n                                     context: string): ReadableStreamGetReaderOptions {\n  assertDictionary(options, context);\n  const mode = options?.mode;\n  return {\n    mode: mode === undefined ? undefined : convertReadableStreamReaderMode(mode, `${context} has member 'mode' that`)\n  };\n}\n\nfunction convertReadableStreamReaderMode(mode: string, context: string): 'byob' {\n  mode = `${mode}`;\n  if (mode !== 'byob') {\n    throw new TypeError(`${context} '${mode}' is not a valid enumeration value for ReadableStreamReaderMode`);\n  }\n  return mode;\n}\n","import { assertDictionary } from './basic';\nimport {\n  ReadableStreamIteratorOptions,\n  ValidatedReadableStreamIteratorOptions\n} from '../readable-stream/iterator-options';\n\nexport function convertIteratorOptions(options: ReadableStreamIteratorOptions | null | undefined,\n                                       context: string): ValidatedReadableStreamIteratorOptions {\n  assertDictionary(options, context);\n  const preventCancel = options?.preventCancel;\n  return { preventCancel: Boolean(preventCancel) };\n}\n","import { assertDictionary } from './basic';\nimport { StreamPipeOptions, ValidatedStreamPipeOptions } from '../readable-stream/pipe-options';\nimport { AbortSignal, isAbortSignal } from '../abort-signal';\n\nexport function convertPipeOptions(options: StreamPipeOptions | null | undefined,\n                                   context: string): ValidatedStreamPipeOptions {\n  assertDictionary(options, context);\n  const preventAbort = options?.preventAbort;\n  const preventCancel = options?.preventCancel;\n  const preventClose = options?.preventClose;\n  const signal = options?.signal;\n  if (signal !== undefined) {\n    assertAbortSignal(signal, `${context} has member 'signal' that`);\n  }\n  return {\n    preventAbort: Boolean(preventAbort),\n    preventCancel: Boolean(preventCancel),\n    preventClose: Boolean(preventClose),\n    signal\n  };\n}\n\nfunction assertAbortSignal(signal: unknown, context: string): asserts signal is AbortSignal {\n  if (!isAbortSignal(signal)) {\n    throw new TypeError(`${context} is not an AbortSignal.`);\n  }\n}\n","import { assertDictionary, assertRequiredField } from './basic';\nimport { ReadableStream } from '../readable-stream';\nimport { WritableStream } from '../writable-stream';\nimport { assertReadableStream } from './readable-stream';\nimport { assertWritableStream } from './writable-stream';\n\nexport function convertReadableWritablePair<RS extends ReadableStream, WS extends WritableStream>(\n  pair: { readable: RS; writable: WS } | null | undefined,\n  context: string\n): { readable: RS; writable: WS } {\n  assertDictionary(pair, context);\n\n  const readable = pair?.readable;\n  assertRequiredField(readable, 'readable', 'ReadableWritablePair');\n  assertReadableStream(readable, `${context} has member 'readable' that`);\n\n  const writable = pair?.writable;\n  assertRequiredField(writable, 'writable', 'ReadableWritablePair');\n  assertWritableStream(writable, `${context} has member 'writable' that`);\n\n  return { readable, writable };\n}\n","import assert from '../stub/assert';\nimport {\n  promiseRejectedWith,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  transformPromiseWith\n} from './helpers/webidl';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { AcquireReadableStreamAsyncIterator, ReadableStreamAsyncIterator } from './readable-stream/async-iterator';\nimport { defaultReaderClosedPromiseReject, defaultReaderClosedPromiseResolve } from './readable-stream/generic-reader';\nimport {\n  AcquireReadableStreamDefaultReader,\n  IsReadableStreamDefaultReader,\n  ReadableStreamDefaultReader,\n  ReadableStreamDefaultReadResult\n} from './readable-stream/default-reader';\nimport {\n  AcquireReadableStreamBYOBReader,\n  IsReadableStreamBYOBReader,\n  ReadableStreamBYOBReader,\n  ReadableStreamBYOBReadResult\n} from './readable-stream/byob-reader';\nimport { ReadableStreamPipeTo } from './readable-stream/pipe';\nimport { ReadableStreamTee } from './readable-stream/tee';\nimport { IsWritableStream, IsWritableStreamLocked, WritableStream } from './writable-stream';\nimport { SimpleQueue } from './simple-queue';\nimport {\n  ReadableByteStreamController,\n  ReadableStreamBYOBRequest,\n  SetUpReadableByteStreamController,\n  SetUpReadableByteStreamControllerFromUnderlyingSource\n} from './readable-stream/byte-stream-controller';\nimport {\n  ReadableStreamDefaultController,\n  SetUpReadableStreamDefaultController,\n  SetUpReadableStreamDefaultControllerFromUnderlyingSource\n} from './readable-stream/default-controller';\nimport {\n  UnderlyingByteSource,\n  UnderlyingByteSourcePullCallback,\n  UnderlyingByteSourceStartCallback,\n  UnderlyingSource,\n  UnderlyingSourceCancelCallback,\n  UnderlyingSourcePullCallback,\n  UnderlyingSourceStartCallback\n} from './readable-stream/underlying-source';\nimport { noop } from '../utils';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { CreateArrayFromList } from './abstract-ops/ecmascript';\nimport { CancelSteps } from './abstract-ops/internal-methods';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { assertObject, assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport { convertUnderlyingDefaultOrByteSource } from './validators/underlying-source';\nimport { ReadableStreamGetReaderOptions } from './readable-stream/reader-options';\nimport { convertReaderOptions } from './validators/reader-options';\nimport { StreamPipeOptions, ValidatedStreamPipeOptions } from './readable-stream/pipe-options';\nimport { ReadableStreamIteratorOptions } from './readable-stream/iterator-options';\nimport { convertIteratorOptions } from './validators/iterator-options';\nimport { convertPipeOptions } from './validators/pipe-options';\nimport { ReadableWritablePair } from './readable-stream/readable-writable-pair';\nimport { convertReadableWritablePair } from './validators/readable-writable-pair';\n\nexport type ReadableByteStream = ReadableStream<Uint8Array> & {\n  _readableStreamController: ReadableByteStreamController\n};\n\ntype ReadableStreamState = 'readable' | 'closed' | 'errored';\n\n/**\n * A readable stream represents a source of data, from which you can read.\n *\n * @public\n */\nexport class ReadableStream<R = any> {\n  /** @internal */\n  _state!: ReadableStreamState;\n  /** @internal */\n  _reader: ReadableStreamReader<R> | undefined;\n  /** @internal */\n  _storedError: any;\n  /** @internal */\n  _disturbed!: boolean;\n  /** @internal */\n  _readableStreamController!: ReadableStreamDefaultController<R> | ReadableByteStreamController;\n\n  constructor(underlyingSource: UnderlyingByteSource, strategy?: { highWaterMark?: number; size?: undefined });\n  constructor(underlyingSource?: UnderlyingSource<R>, strategy?: QueuingStrategy<R>);\n  constructor(rawUnderlyingSource: UnderlyingSource<R> | UnderlyingByteSource | null | undefined = {},\n              rawStrategy: QueuingStrategy<R> | null | undefined = {}) {\n    if (rawUnderlyingSource === undefined) {\n      rawUnderlyingSource = null;\n    } else {\n      assertObject(rawUnderlyingSource, 'First parameter');\n    }\n\n    const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');\n    const underlyingSource = convertUnderlyingDefaultOrByteSource(rawUnderlyingSource, 'First parameter');\n\n    InitializeReadableStream(this);\n\n    if (underlyingSource.type === 'bytes') {\n      if (strategy.size !== undefined) {\n        throw new RangeError('The strategy for a byte stream cannot have a size function');\n      }\n      const highWaterMark = ExtractHighWaterMark(strategy, 0);\n      SetUpReadableByteStreamControllerFromUnderlyingSource(\n        this as unknown as ReadableByteStream,\n        underlyingSource,\n        highWaterMark\n      );\n    } else {\n      assert(underlyingSource.type === undefined);\n      const sizeAlgorithm = ExtractSizeAlgorithm(strategy);\n      const highWaterMark = ExtractHighWaterMark(strategy, 1);\n      SetUpReadableStreamDefaultControllerFromUnderlyingSource(\n        this,\n        underlyingSource,\n        highWaterMark,\n        sizeAlgorithm\n      );\n    }\n  }\n\n  /**\n   * Whether or not the readable stream is locked to a {@link ReadableStreamDefaultReader | reader}.\n   */\n  get locked(): boolean {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('locked');\n    }\n\n    return IsReadableStreamLocked(this);\n  }\n\n  /**\n   * Cancels the stream, signaling a loss of interest in the stream by a consumer.\n   *\n   * The supplied `reason` argument will be given to the underlying source's {@link UnderlyingSource.cancel | cancel()}\n   * method, which might or might not use it.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('cancel'));\n    }\n\n    if (IsReadableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot cancel a stream that already has a reader'));\n    }\n\n    return ReadableStreamCancel(this, reason);\n  }\n\n  /**\n   * Creates a {@link ReadableStreamBYOBReader} and locks the stream to the new reader.\n   *\n   * This call behaves the same way as the no-argument variant, except that it only works on readable byte streams,\n   * i.e. streams which were constructed specifically with the ability to handle \"bring your own buffer\" reading.\n   * The returned BYOB reader provides the ability to directly read individual chunks from the stream via its\n   * {@link ReadableStreamBYOBReader.read | read()} method, into developer-supplied buffers, allowing more precise\n   * control over allocation.\n   */\n  getReader({ mode }: { mode: 'byob' }): ReadableStreamBYOBReader;\n  /**\n   * Creates a {@link ReadableStreamDefaultReader} and locks the stream to the new reader.\n   * While the stream is locked, no other reader can be acquired until this one is released.\n   *\n   * This functionality is especially useful for creating abstractions that desire the ability to consume a stream\n   * in its entirety. By getting a reader for the stream, you can ensure nobody else can interleave reads with yours\n   * or cancel the stream, which would interfere with your abstraction.\n   */\n  getReader(): ReadableStreamDefaultReader<R>;\n  getReader(\n    rawOptions: ReadableStreamGetReaderOptions | null | undefined = undefined\n  ): ReadableStreamDefaultReader<R> | ReadableStreamBYOBReader {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('getReader');\n    }\n\n    const options = convertReaderOptions(rawOptions, 'First parameter');\n\n    if (options.mode === undefined) {\n      return AcquireReadableStreamDefaultReader(this);\n    }\n\n    assert(options.mode === 'byob');\n    return AcquireReadableStreamBYOBReader(this as unknown as ReadableByteStream);\n  }\n\n  /**\n   * Provides a convenient, chainable way of piping this readable stream through a transform stream\n   * (or any other `{ writable, readable }` pair). It simply {@link ReadableStream.pipeTo | pipes} the stream\n   * into the writable side of the supplied pair, and returns the readable side for further use.\n   *\n   * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.\n   */\n  pipeThrough<RS extends ReadableStream>(\n    transform: { readable: RS; writable: WritableStream<R> },\n    options?: StreamPipeOptions\n  ): RS;\n  pipeThrough<RS extends ReadableStream>(\n    rawTransform: { readable: RS; writable: WritableStream<R> } | null | undefined,\n    rawOptions: StreamPipeOptions | null | undefined = {}\n  ): RS {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('pipeThrough');\n    }\n    assertRequiredArgument(rawTransform, 1, 'pipeThrough');\n\n    const transform = convertReadableWritablePair(rawTransform, 'First parameter');\n    const options = convertPipeOptions(rawOptions, 'Second parameter');\n\n    if (IsReadableStreamLocked(this)) {\n      throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked ReadableStream');\n    }\n    if (IsWritableStreamLocked(transform.writable)) {\n      throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked WritableStream');\n    }\n\n    const promise = ReadableStreamPipeTo(\n      this, transform.writable, options.preventClose, options.preventAbort, options.preventCancel, options.signal\n    );\n\n    setPromiseIsHandledToTrue(promise);\n\n    return transform.readable;\n  }\n\n  /**\n   * Pipes this readable stream to a given writable stream. The way in which the piping process behaves under\n   * various error conditions can be customized with a number of passed options. It returns a promise that fulfills\n   * when the piping process completes successfully, or rejects if any errors were encountered.\n   *\n   * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.\n   */\n  pipeTo(destination: WritableStream<R>, options?: StreamPipeOptions): Promise<void>;\n  pipeTo(destination: WritableStream<R> | null | undefined,\n         rawOptions: StreamPipeOptions | null | undefined = {}): Promise<void> {\n    if (!IsReadableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('pipeTo'));\n    }\n\n    if (destination === undefined) {\n      return promiseRejectedWith(`Parameter 1 is required in 'pipeTo'.`);\n    }\n    if (!IsWritableStream(destination)) {\n      return promiseRejectedWith(\n        new TypeError(`ReadableStream.prototype.pipeTo's first argument must be a WritableStream`)\n      );\n    }\n\n    let options: ValidatedStreamPipeOptions;\n    try {\n      options = convertPipeOptions(rawOptions, 'Second parameter');\n    } catch (e) {\n      return promiseRejectedWith(e);\n    }\n\n    if (IsReadableStreamLocked(this)) {\n      return promiseRejectedWith(\n        new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream')\n      );\n    }\n    if (IsWritableStreamLocked(destination)) {\n      return promiseRejectedWith(\n        new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream')\n      );\n    }\n\n    return ReadableStreamPipeTo<R>(\n      this, destination, options.preventClose, options.preventAbort, options.preventCancel, options.signal\n    );\n  }\n\n  /**\n   * Tees this readable stream, returning a two-element array containing the two resulting branches as\n   * new {@link ReadableStream} instances.\n   *\n   * Teeing a stream will lock it, preventing any other consumer from acquiring a reader.\n   * To cancel the stream, cancel both of the resulting branches; a composite cancellation reason will then be\n   * propagated to the stream's underlying source.\n   *\n   * Note that the chunks seen in each branch will be the same object. If the chunks are not immutable,\n   * this could allow interference between the two branches.\n   */\n  tee(): [ReadableStream<R>, ReadableStream<R>] {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('tee');\n    }\n\n    const branches = ReadableStreamTee(this, false);\n    return CreateArrayFromList(branches);\n  }\n\n  /**\n   * Asynchronously iterates over the chunks in the stream's internal queue.\n   *\n   * Asynchronously iterating over the stream will lock it, preventing any other consumer from acquiring a reader.\n   * The lock will be released if the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method\n   * is called, e.g. by breaking out of the loop.\n   *\n   * By default, calling the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method will also\n   * cancel the stream. To prevent this, use the stream's {@link ReadableStream.values | values()} method, passing\n   * `true` for the `preventCancel` option.\n   */\n  values(options?: ReadableStreamIteratorOptions): ReadableStreamAsyncIterator<R>;\n  values(rawOptions: ReadableStreamIteratorOptions | null | undefined = undefined): ReadableStreamAsyncIterator<R> {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('values');\n    }\n\n    const options = convertIteratorOptions(rawOptions, 'First parameter');\n    return AcquireReadableStreamAsyncIterator<R>(this, options.preventCancel);\n  }\n\n  /**\n   * {@inheritDoc ReadableStream.values}\n   */\n  [Symbol.asyncIterator]: (options?: ReadableStreamIteratorOptions) => ReadableStreamAsyncIterator<R>;\n}\n\nObject.defineProperties(ReadableStream.prototype, {\n  cancel: { enumerable: true },\n  getReader: { enumerable: true },\n  pipeThrough: { enumerable: true },\n  pipeTo: { enumerable: true },\n  tee: { enumerable: true },\n  values: { enumerable: true },\n  locked: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStream.prototype, Symbol.toStringTag, {\n    value: 'ReadableStream',\n    configurable: true\n  });\n}\nif (typeof Symbol.asyncIterator === 'symbol') {\n  Object.defineProperty(ReadableStream.prototype, Symbol.asyncIterator, {\n    value: ReadableStream.prototype.values,\n    writable: true,\n    configurable: true\n  });\n}\n\nexport {\n  ReadableStreamAsyncIterator,\n  ReadableStreamDefaultReadResult,\n  ReadableStreamBYOBReadResult,\n  UnderlyingByteSource,\n  UnderlyingSource,\n  UnderlyingSourceStartCallback,\n  UnderlyingSourcePullCallback,\n  UnderlyingSourceCancelCallback,\n  UnderlyingByteSourceStartCallback,\n  UnderlyingByteSourcePullCallback,\n  StreamPipeOptions,\n  ReadableWritablePair,\n  ReadableStreamIteratorOptions\n};\n\n// Abstract operations for the ReadableStream.\n\n// Throws if and only if startAlgorithm throws.\nexport function CreateReadableStream<R>(startAlgorithm: () => void | PromiseLike<void>,\n                                        pullAlgorithm: () => Promise<void>,\n                                        cancelAlgorithm: (reason: any) => Promise<void>,\n                                        highWaterMark = 1,\n                                        sizeAlgorithm: QueuingStrategySizeCallback<R> = () => 1): ReadableStream<R> {\n  assert(IsNonNegativeNumber(highWaterMark));\n\n  const stream: ReadableStream<R> = Object.create(ReadableStream.prototype);\n  InitializeReadableStream(stream);\n\n  const controller: ReadableStreamDefaultController<R> = Object.create(ReadableStreamDefaultController.prototype);\n  SetUpReadableStreamDefaultController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm\n  );\n\n  return stream;\n}\n\n// Throws if and only if startAlgorithm throws.\nexport function CreateReadableByteStream(\n  startAlgorithm: () => void | PromiseLike<void>,\n  pullAlgorithm: () => Promise<void>,\n  cancelAlgorithm: (reason: any) => Promise<void>\n): ReadableByteStream {\n  const stream: ReadableByteStream = Object.create(ReadableStream.prototype);\n  InitializeReadableStream(stream);\n\n  const controller: ReadableByteStreamController = Object.create(ReadableByteStreamController.prototype);\n  SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, 0, undefined);\n\n  return stream;\n}\n\nfunction InitializeReadableStream(stream: ReadableStream) {\n  stream._state = 'readable';\n  stream._reader = undefined;\n  stream._storedError = undefined;\n  stream._disturbed = false;\n}\n\nexport function IsReadableStream(x: unknown): x is ReadableStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readableStreamController')) {\n    return false;\n  }\n\n  return x instanceof ReadableStream;\n}\n\nexport function IsReadableStreamDisturbed(stream: ReadableStream): boolean {\n  assert(IsReadableStream(stream));\n\n  return stream._disturbed;\n}\n\nexport function IsReadableStreamLocked(stream: ReadableStream): boolean {\n  assert(IsReadableStream(stream));\n\n  if (stream._reader === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamCancel<R>(stream: ReadableStream<R>, reason: any): Promise<undefined> {\n  stream._disturbed = true;\n\n  if (stream._state === 'closed') {\n    return promiseResolvedWith(undefined);\n  }\n  if (stream._state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  ReadableStreamClose(stream);\n\n  const reader = stream._reader;\n  if (reader !== undefined && IsReadableStreamBYOBReader(reader)) {\n    reader._readIntoRequests.forEach(readIntoRequest => {\n      readIntoRequest._closeSteps(undefined);\n    });\n    reader._readIntoRequests = new SimpleQueue();\n  }\n\n  const sourceCancelPromise = stream._readableStreamController[CancelSteps](reason);\n  return transformPromiseWith(sourceCancelPromise, noop);\n}\n\nexport function ReadableStreamClose<R>(stream: ReadableStream<R>): void {\n  assert(stream._state === 'readable');\n\n  stream._state = 'closed';\n\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return;\n  }\n\n  defaultReaderClosedPromiseResolve(reader);\n\n  if (IsReadableStreamDefaultReader<R>(reader)) {\n    reader._readRequests.forEach(readRequest => {\n      readRequest._closeSteps();\n    });\n    reader._readRequests = new SimpleQueue();\n  }\n}\n\nexport function ReadableStreamError<R>(stream: ReadableStream<R>, e: any): void {\n  assert(IsReadableStream(stream));\n  assert(stream._state === 'readable');\n\n  stream._state = 'errored';\n  stream._storedError = e;\n\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return;\n  }\n\n  defaultReaderClosedPromiseReject(reader, e);\n\n  if (IsReadableStreamDefaultReader<R>(reader)) {\n    reader._readRequests.forEach(readRequest => {\n      readRequest._errorSteps(e);\n    });\n\n    reader._readRequests = new SimpleQueue();\n  } else {\n    assert(IsReadableStreamBYOBReader(reader));\n\n    reader._readIntoRequests.forEach(readIntoRequest => {\n      readIntoRequest._errorSteps(e);\n    });\n\n    reader._readIntoRequests = new SimpleQueue();\n  }\n}\n\n// Readers\n\nexport type ReadableStreamReader<R> = ReadableStreamDefaultReader<R> | ReadableStreamBYOBReader;\n\nexport {\n  ReadableStreamDefaultReader,\n  ReadableStreamBYOBReader\n};\n\n// Controllers\n\nexport {\n  ReadableStreamDefaultController,\n  ReadableStreamBYOBRequest,\n  ReadableByteStreamController\n};\n\n// Helper functions for the ReadableStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(`ReadableStream.prototype.${name} can only be used on a ReadableStream`);\n}\n","import { QueuingStrategyInit } from '../queuing-strategy';\nimport { assertDictionary, assertRequiredField, convertUnrestrictedDouble } from './basic';\n\nexport function convertQueuingStrategyInit(init: QueuingStrategyInit | null | undefined,\n                                           context: string): QueuingStrategyInit {\n  assertDictionary(init, context);\n  const highWaterMark = init?.highWaterMark;\n  assertRequiredField(highWaterMark, 'highWaterMark', 'QueuingStrategyInit');\n  return {\n    highWaterMark: convertUnrestrictedDouble(highWaterMark)\n  };\n}\n","import { QueuingStrategy, QueuingStrategyInit } from './queuing-strategy';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategyInit } from './validators/queuing-strategy-init';\n\n// The size function must not have a prototype property nor be a constructor\nconst byteLengthSizeFunction = (chunk: ArrayBufferView): number => {\n  return chunk.byteLength;\n};\ntry {\n  Object.defineProperty(byteLengthSizeFunction, 'name', {\n    value: 'size',\n    configurable: true\n  });\n} catch {\n  // This property is non-configurable in older browsers, so ignore if this throws.\n  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility\n}\n\n/**\n * A queuing strategy that counts the number of bytes in each chunk.\n *\n * @public\n */\nexport default class ByteLengthQueuingStrategy implements QueuingStrategy<ArrayBufferView> {\n  /** @internal */\n  readonly _byteLengthQueuingStrategyHighWaterMark: number;\n\n  constructor(options: QueuingStrategyInit) {\n    assertRequiredArgument(options, 1, 'ByteLengthQueuingStrategy');\n    options = convertQueuingStrategyInit(options, 'First parameter');\n    this._byteLengthQueuingStrategyHighWaterMark = options.highWaterMark;\n  }\n\n  /**\n   * Returns the high water mark provided to the constructor.\n   */\n  get highWaterMark(): number {\n    if (!IsByteLengthQueuingStrategy(this)) {\n      throw byteLengthBrandCheckException('highWaterMark');\n    }\n    return this._byteLengthQueuingStrategyHighWaterMark;\n  }\n\n  /**\n   * Measures the size of `chunk` by returning the value of its `byteLength` property.\n   */\n  get size(): (chunk: ArrayBufferView) => number {\n    if (!IsByteLengthQueuingStrategy(this)) {\n      throw byteLengthBrandCheckException('size');\n    }\n    return byteLengthSizeFunction;\n  }\n}\n\nObject.defineProperties(ByteLengthQueuingStrategy.prototype, {\n  highWaterMark: { enumerable: true },\n  size: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ByteLengthQueuingStrategy.prototype, Symbol.toStringTag, {\n    value: 'ByteLengthQueuingStrategy',\n    configurable: true\n  });\n}\n\n// Helper functions for the ByteLengthQueuingStrategy.\n\nfunction byteLengthBrandCheckException(name: string): TypeError {\n  return new TypeError(`ByteLengthQueuingStrategy.prototype.${name} can only be used on a ByteLengthQueuingStrategy`);\n}\n\nexport function IsByteLengthQueuingStrategy(x: any): x is ByteLengthQueuingStrategy {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_byteLengthQueuingStrategyHighWaterMark')) {\n    return false;\n  }\n\n  return x instanceof ByteLengthQueuingStrategy;\n}\n","import { QueuingStrategy, QueuingStrategyInit } from './queuing-strategy';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategyInit } from './validators/queuing-strategy-init';\n\n// The size function must not have a prototype property nor be a constructor\nconst countSizeFunction = (): 1 => {\n  return 1;\n};\ntry {\n  Object.defineProperty(countSizeFunction, 'name', {\n    value: 'size',\n    configurable: true\n  });\n} catch {\n  // This property is non-configurable in older browsers, so ignore if this throws.\n  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility\n}\n\n/**\n * A queuing strategy that counts the number of chunks.\n *\n * @public\n */\nexport default class CountQueuingStrategy implements QueuingStrategy<any> {\n  /** @internal */\n  readonly _countQueuingStrategyHighWaterMark!: number;\n\n  constructor(options: QueuingStrategyInit) {\n    assertRequiredArgument(options, 1, 'CountQueuingStrategy');\n    options = convertQueuingStrategyInit(options, 'First parameter');\n    this._countQueuingStrategyHighWaterMark = options.highWaterMark;\n  }\n\n  /**\n   * Returns the high water mark provided to the constructor.\n   */\n  get highWaterMark(): number {\n    if (!IsCountQueuingStrategy(this)) {\n      throw countBrandCheckException('highWaterMark');\n    }\n    return this._countQueuingStrategyHighWaterMark;\n  }\n\n  /**\n   * Measures the size of `chunk` by always returning 1.\n   * This ensures that the total queue size is a count of the number of chunks in the queue.\n   */\n  get size(): (chunk: any) => 1 {\n    if (!IsCountQueuingStrategy(this)) {\n      throw countBrandCheckException('size');\n    }\n    return countSizeFunction;\n  }\n}\n\nObject.defineProperties(CountQueuingStrategy.prototype, {\n  highWaterMark: { enumerable: true },\n  size: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(CountQueuingStrategy.prototype, Symbol.toStringTag, {\n    value: 'CountQueuingStrategy',\n    configurable: true\n  });\n}\n\n// Helper functions for the CountQueuingStrategy.\n\nfunction countBrandCheckException(name: string): TypeError {\n  return new TypeError(`CountQueuingStrategy.prototype.${name} can only be used on a CountQueuingStrategy`);\n}\n\nexport function IsCountQueuingStrategy(x: any): x is CountQueuingStrategy {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_countQueuingStrategyHighWaterMark')) {\n    return false;\n  }\n\n  return x instanceof CountQueuingStrategy;\n}\n","import { assertDictionary, assertFunction } from './basic';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\nimport {\n  Transformer,\n  TransformerFlushCallback,\n  TransformerStartCallback,\n  TransformerTransformCallback,\n  ValidatedTransformer\n} from '../transform-stream/transformer';\nimport { TransformStreamDefaultController } from '../transform-stream';\n\nexport function convertTransformer<I, O>(original: Transformer<I, O> | null,\n                                         context: string): ValidatedTransformer<I, O> {\n  assertDictionary(original, context);\n  const flush = original?.flush;\n  const readableType = original?.readableType;\n  const start = original?.start;\n  const transform = original?.transform;\n  const writableType = original?.writableType;\n  return {\n    flush: flush === undefined ?\n      undefined :\n      convertTransformerFlushCallback(flush, original!, `${context} has member 'flush' that`),\n    readableType,\n    start: start === undefined ?\n      undefined :\n      convertTransformerStartCallback(start, original!, `${context} has member 'start' that`),\n    transform: transform === undefined ?\n      undefined :\n      convertTransformerTransformCallback(transform, original!, `${context} has member 'transform' that`),\n    writableType\n  };\n}\n\nfunction convertTransformerFlushCallback<I, O>(\n  fn: TransformerFlushCallback<O>,\n  original: Transformer<I, O>,\n  context: string\n): (controller: TransformStreamDefaultController<O>) => Promise<void> {\n  assertFunction(fn, context);\n  return (controller: TransformStreamDefaultController<O>) => promiseCall(fn, original, [controller]);\n}\n\nfunction convertTransformerStartCallback<I, O>(\n  fn: TransformerStartCallback<O>,\n  original: Transformer<I, O>,\n  context: string\n): TransformerStartCallback<O> {\n  assertFunction(fn, context);\n  return (controller: TransformStreamDefaultController<O>) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertTransformerTransformCallback<I, O>(\n  fn: TransformerTransformCallback<I, O>,\n  original: Transformer<I, O>,\n  context: string\n): (chunk: I, controller: TransformStreamDefaultController<O>) => Promise<void> {\n  assertFunction(fn, context);\n  return (chunk: I, controller: TransformStreamDefaultController<O>) => promiseCall(fn, original, [chunk, controller]);\n}\n","import assert from '../stub/assert';\nimport { newPromise, promiseRejectedWith, promiseResolvedWith, transformPromiseWith } from './helpers/webidl';\nimport { CreateReadableStream, ReadableStream, ReadableStreamDefaultController } from './readable-stream';\nimport {\n  ReadableStreamDefaultControllerCanCloseOrEnqueue,\n  ReadableStreamDefaultControllerClose,\n  ReadableStreamDefaultControllerEnqueue,\n  ReadableStreamDefaultControllerError,\n  ReadableStreamDefaultControllerGetDesiredSize,\n  ReadableStreamDefaultControllerHasBackpressure\n} from './readable-stream/default-controller';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { CreateWritableStream, WritableStream, WritableStreamDefaultControllerErrorIfNeeded } from './writable-stream';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport {\n  Transformer,\n  TransformerFlushCallback,\n  TransformerStartCallback,\n  TransformerTransformCallback,\n  ValidatedTransformer\n} from './transform-stream/transformer';\nimport { convertTransformer } from './validators/transformer';\n\n// Class TransformStream\n\n/**\n * A transform stream consists of a pair of streams: a {@link WritableStream | writable stream},\n * known as its writable side, and a {@link ReadableStream | readable stream}, known as its readable side.\n * In a manner specific to the transform stream in question, writes to the writable side result in new data being\n * made available for reading from the readable side.\n *\n * @public\n */\nexport class TransformStream<I = any, O = any> {\n  /** @internal */\n  _writable!: WritableStream<I>;\n  /** @internal */\n  _readable!: ReadableStream<O>;\n  /** @internal */\n  _backpressure!: boolean;\n  /** @internal */\n  _backpressureChangePromise!: Promise<void>;\n  /** @internal */\n  _backpressureChangePromise_resolve!: () => void;\n  /** @internal */\n  _transformStreamController!: TransformStreamDefaultController<O>;\n\n  constructor(\n    transformer?: Transformer<I, O>,\n    writableStrategy?: QueuingStrategy<I>,\n    readableStrategy?: QueuingStrategy<O>\n  );\n  constructor(rawTransformer: Transformer<I, O> | null | undefined = {},\n              rawWritableStrategy: QueuingStrategy<I> | null | undefined = {},\n              rawReadableStrategy: QueuingStrategy<O> | null | undefined = {}) {\n    if (rawTransformer === undefined) {\n      rawTransformer = null;\n    }\n\n    const writableStrategy = convertQueuingStrategy(rawWritableStrategy, 'Second parameter');\n    const readableStrategy = convertQueuingStrategy(rawReadableStrategy, 'Third parameter');\n\n    const transformer = convertTransformer(rawTransformer, 'First parameter');\n    if (transformer.readableType !== undefined) {\n      throw new RangeError('Invalid readableType specified');\n    }\n    if (transformer.writableType !== undefined) {\n      throw new RangeError('Invalid writableType specified');\n    }\n\n    const readableHighWaterMark = ExtractHighWaterMark(readableStrategy, 0);\n    const readableSizeAlgorithm = ExtractSizeAlgorithm(readableStrategy);\n    const writableHighWaterMark = ExtractHighWaterMark(writableStrategy, 1);\n    const writableSizeAlgorithm = ExtractSizeAlgorithm(writableStrategy);\n\n    let startPromise_resolve!: (value: void | PromiseLike<void>) => void;\n    const startPromise = newPromise<void>(resolve => {\n      startPromise_resolve = resolve;\n    });\n\n    InitializeTransformStream(\n      this, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm\n    );\n    SetUpTransformStreamDefaultControllerFromTransformer(this, transformer);\n\n    if (transformer.start !== undefined) {\n      startPromise_resolve(transformer.start(this._transformStreamController));\n    } else {\n      startPromise_resolve(undefined);\n    }\n  }\n\n  /**\n   * The readable side of the transform stream.\n   */\n  get readable(): ReadableStream<O> {\n    if (!IsTransformStream(this)) {\n      throw streamBrandCheckException('readable');\n    }\n\n    return this._readable;\n  }\n\n  /**\n   * The writable side of the transform stream.\n   */\n  get writable(): WritableStream<I> {\n    if (!IsTransformStream(this)) {\n      throw streamBrandCheckException('writable');\n    }\n\n    return this._writable;\n  }\n}\n\nObject.defineProperties(TransformStream.prototype, {\n  readable: { enumerable: true },\n  writable: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(TransformStream.prototype, Symbol.toStringTag, {\n    value: 'TransformStream',\n    configurable: true\n  });\n}\n\nexport {\n  Transformer,\n  TransformerStartCallback,\n  TransformerFlushCallback,\n  TransformerTransformCallback\n};\n\n// Transform Stream Abstract Operations\n\nexport function CreateTransformStream<I, O>(startAlgorithm: () => void | PromiseLike<void>,\n                                            transformAlgorithm: (chunk: I) => Promise<void>,\n                                            flushAlgorithm: () => Promise<void>,\n                                            writableHighWaterMark = 1,\n                                            writableSizeAlgorithm: QueuingStrategySizeCallback<I> = () => 1,\n                                            readableHighWaterMark = 0,\n                                            readableSizeAlgorithm: QueuingStrategySizeCallback<O> = () => 1) {\n  assert(IsNonNegativeNumber(writableHighWaterMark));\n  assert(IsNonNegativeNumber(readableHighWaterMark));\n\n  const stream: TransformStream<I, O> = Object.create(TransformStream.prototype);\n\n  let startPromise_resolve!: (value: void | PromiseLike<void>) => void;\n  const startPromise = newPromise<void>(resolve => {\n    startPromise_resolve = resolve;\n  });\n\n  InitializeTransformStream(stream, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark,\n                            readableSizeAlgorithm);\n\n  const controller: TransformStreamDefaultController<O> = Object.create(TransformStreamDefaultController.prototype);\n\n  SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);\n\n  const startResult = startAlgorithm();\n  startPromise_resolve(startResult);\n  return stream;\n}\n\nfunction InitializeTransformStream<I, O>(stream: TransformStream<I, O>,\n                                         startPromise: Promise<void>,\n                                         writableHighWaterMark: number,\n                                         writableSizeAlgorithm: QueuingStrategySizeCallback<I>,\n                                         readableHighWaterMark: number,\n                                         readableSizeAlgorithm: QueuingStrategySizeCallback<O>) {\n  function startAlgorithm(): Promise<void> {\n    return startPromise;\n  }\n\n  function writeAlgorithm(chunk: I): Promise<void> {\n    return TransformStreamDefaultSinkWriteAlgorithm(stream, chunk);\n  }\n\n  function abortAlgorithm(reason: any): Promise<void> {\n    return TransformStreamDefaultSinkAbortAlgorithm(stream, reason);\n  }\n\n  function closeAlgorithm(): Promise<void> {\n    return TransformStreamDefaultSinkCloseAlgorithm(stream);\n  }\n\n  stream._writable = CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm,\n                                          writableHighWaterMark, writableSizeAlgorithm);\n\n  function pullAlgorithm(): Promise<void> {\n    return TransformStreamDefaultSourcePullAlgorithm(stream);\n  }\n\n  function cancelAlgorithm(reason: any): Promise<void> {\n    TransformStreamErrorWritableAndUnblockWrite(stream, reason);\n    return promiseResolvedWith(undefined);\n  }\n\n  stream._readable = CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, readableHighWaterMark,\n                                          readableSizeAlgorithm);\n\n  // The [[backpressure]] slot is set to undefined so that it can be initialised by TransformStreamSetBackpressure.\n  stream._backpressure = undefined!;\n  stream._backpressureChangePromise = undefined!;\n  stream._backpressureChangePromise_resolve = undefined!;\n  TransformStreamSetBackpressure(stream, true);\n\n  stream._transformStreamController = undefined!;\n}\n\nfunction IsTransformStream(x: unknown): x is TransformStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_transformStreamController')) {\n    return false;\n  }\n\n  return x instanceof TransformStream;\n}\n\n// This is a no-op if both sides are already errored.\nfunction TransformStreamError(stream: TransformStream, e: any) {\n  ReadableStreamDefaultControllerError(\n    stream._readable._readableStreamController as ReadableStreamDefaultController<any>,\n    e\n  );\n  TransformStreamErrorWritableAndUnblockWrite(stream, e);\n}\n\nfunction TransformStreamErrorWritableAndUnblockWrite(stream: TransformStream, e: any) {\n  TransformStreamDefaultControllerClearAlgorithms(stream._transformStreamController);\n  WritableStreamDefaultControllerErrorIfNeeded(stream._writable._writableStreamController, e);\n  if (stream._backpressure) {\n    // Pretend that pull() was called to permit any pending write() calls to complete. TransformStreamSetBackpressure()\n    // cannot be called from enqueue() or pull() once the ReadableStream is errored, so this will will be the final time\n    // _backpressure is set.\n    TransformStreamSetBackpressure(stream, false);\n  }\n}\n\nfunction TransformStreamSetBackpressure(stream: TransformStream, backpressure: boolean) {\n  // Passes also when called during construction.\n  assert(stream._backpressure !== backpressure);\n\n  if (stream._backpressureChangePromise !== undefined) {\n    stream._backpressureChangePromise_resolve();\n  }\n\n  stream._backpressureChangePromise = newPromise(resolve => {\n    stream._backpressureChangePromise_resolve = resolve;\n  });\n\n  stream._backpressure = backpressure;\n}\n\n// Class TransformStreamDefaultController\n\n/**\n * Allows control of the {@link ReadableStream} and {@link WritableStream} of the associated {@link TransformStream}.\n *\n * @public\n */\nexport class TransformStreamDefaultController<O> {\n  /** @internal */\n  _controlledTransformStream: TransformStream<any, O>;\n  /** @internal */\n  _transformAlgorithm: (chunk: any) => Promise<void>;\n  /** @internal */\n  _flushAlgorithm: () => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the desired size to fill the readable side’s internal queue. It can be negative, if the queue is over-full.\n   */\n  get desiredSize(): number | null {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('desiredSize');\n    }\n\n    const readableController = this._controlledTransformStream._readable._readableStreamController;\n    return ReadableStreamDefaultControllerGetDesiredSize(readableController as ReadableStreamDefaultController<O>);\n  }\n\n  /**\n   * Enqueues the given chunk `chunk` in the readable side of the controlled transform stream.\n   */\n  enqueue(chunk: O): void;\n  enqueue(chunk: O = undefined!): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('enqueue');\n    }\n\n    TransformStreamDefaultControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors both the readable side and the writable side of the controlled transform stream, making all future\n   * interactions with it fail with the given error `e`. Any chunks queued for transformation will be discarded.\n   */\n  error(reason: any = undefined): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n\n    TransformStreamDefaultControllerError(this, reason);\n  }\n\n  /**\n   * Closes the readable side and errors the writable side of the controlled transform stream. This is useful when the\n   * transformer only needs to consume a portion of the chunks written to the writable side.\n   */\n  terminate(): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('terminate');\n    }\n\n    TransformStreamDefaultControllerTerminate(this);\n  }\n}\n\nObject.defineProperties(TransformStreamDefaultController.prototype, {\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  terminate: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(TransformStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'TransformStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Transform Stream Default Controller Abstract Operations\n\nfunction IsTransformStreamDefaultController<O = any>(x: any): x is TransformStreamDefaultController<O> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledTransformStream')) {\n    return false;\n  }\n\n  return x instanceof TransformStreamDefaultController;\n}\n\nfunction SetUpTransformStreamDefaultController<I, O>(stream: TransformStream<I, O>,\n                                                     controller: TransformStreamDefaultController<O>,\n                                                     transformAlgorithm: (chunk: I) => Promise<void>,\n                                                     flushAlgorithm: () => Promise<void>) {\n  assert(IsTransformStream(stream));\n  assert(stream._transformStreamController === undefined);\n\n  controller._controlledTransformStream = stream;\n  stream._transformStreamController = controller;\n\n  controller._transformAlgorithm = transformAlgorithm;\n  controller._flushAlgorithm = flushAlgorithm;\n}\n\nfunction SetUpTransformStreamDefaultControllerFromTransformer<I, O>(stream: TransformStream<I, O>,\n                                                                    transformer: ValidatedTransformer<I, O>) {\n  const controller: TransformStreamDefaultController<O> = Object.create(TransformStreamDefaultController.prototype);\n\n  let transformAlgorithm = (chunk: I): Promise<void> => {\n    try {\n      TransformStreamDefaultControllerEnqueue(controller, chunk as unknown as O);\n      return promiseResolvedWith(undefined);\n    } catch (transformResultE) {\n      return promiseRejectedWith(transformResultE);\n    }\n  };\n\n  let flushAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (transformer.transform !== undefined) {\n    transformAlgorithm = chunk => transformer.transform!(chunk, controller);\n  }\n  if (transformer.flush !== undefined) {\n    flushAlgorithm = () => transformer.flush!(controller);\n  }\n\n  SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);\n}\n\nfunction TransformStreamDefaultControllerClearAlgorithms(controller: TransformStreamDefaultController<any>) {\n  controller._transformAlgorithm = undefined!;\n  controller._flushAlgorithm = undefined!;\n}\n\nfunction TransformStreamDefaultControllerEnqueue<O>(controller: TransformStreamDefaultController<O>, chunk: O) {\n  const stream = controller._controlledTransformStream;\n  const readableController = stream._readable._readableStreamController as ReadableStreamDefaultController<O>;\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(readableController)) {\n    throw new TypeError('Readable side is not in a state that permits enqueue');\n  }\n\n  // We throttle transform invocations based on the backpressure of the ReadableStream, but we still\n  // accept TransformStreamDefaultControllerEnqueue() calls.\n\n  try {\n    ReadableStreamDefaultControllerEnqueue(readableController, chunk);\n  } catch (e) {\n    // This happens when readableStrategy.size() throws.\n    TransformStreamErrorWritableAndUnblockWrite(stream, e);\n\n    throw stream._readable._storedError;\n  }\n\n  const backpressure = ReadableStreamDefaultControllerHasBackpressure(readableController);\n  if (backpressure !== stream._backpressure) {\n    assert(backpressure);\n    TransformStreamSetBackpressure(stream, true);\n  }\n}\n\nfunction TransformStreamDefaultControllerError(controller: TransformStreamDefaultController<any>, e: any) {\n  TransformStreamError(controller._controlledTransformStream, e);\n}\n\nfunction TransformStreamDefaultControllerPerformTransform<I, O>(controller: TransformStreamDefaultController<O>,\n                                                                chunk: I) {\n  const transformPromise = controller._transformAlgorithm(chunk);\n  return transformPromiseWith(transformPromise, undefined, r => {\n    TransformStreamError(controller._controlledTransformStream, r);\n    throw r;\n  });\n}\n\nfunction TransformStreamDefaultControllerTerminate<O>(controller: TransformStreamDefaultController<O>) {\n  const stream = controller._controlledTransformStream;\n  const readableController = stream._readable._readableStreamController as ReadableStreamDefaultController<O>;\n\n  ReadableStreamDefaultControllerClose(readableController);\n\n  const error = new TypeError('TransformStream terminated');\n  TransformStreamErrorWritableAndUnblockWrite(stream, error);\n}\n\n// TransformStreamDefaultSink Algorithms\n\nfunction TransformStreamDefaultSinkWriteAlgorithm<I, O>(stream: TransformStream<I, O>, chunk: I): Promise<void> {\n  assert(stream._writable._state === 'writable');\n\n  const controller = stream._transformStreamController;\n\n  if (stream._backpressure) {\n    const backpressureChangePromise = stream._backpressureChangePromise;\n    assert(backpressureChangePromise !== undefined);\n    return transformPromiseWith(backpressureChangePromise, () => {\n      const writable = stream._writable;\n      const state = writable._state;\n      if (state === 'erroring') {\n        throw writable._storedError;\n      }\n      assert(state === 'writable');\n      return TransformStreamDefaultControllerPerformTransform<I, O>(controller, chunk);\n    });\n  }\n\n  return TransformStreamDefaultControllerPerformTransform<I, O>(controller, chunk);\n}\n\nfunction TransformStreamDefaultSinkAbortAlgorithm(stream: TransformStream, reason: any): Promise<void> {\n  // abort() is not called synchronously, so it is possible for abort() to be called when the stream is already\n  // errored.\n  TransformStreamError(stream, reason);\n  return promiseResolvedWith(undefined);\n}\n\nfunction TransformStreamDefaultSinkCloseAlgorithm<I, O>(stream: TransformStream<I, O>): Promise<void> {\n  // stream._readable cannot change after construction, so caching it across a call to user code is safe.\n  const readable = stream._readable;\n\n  const controller = stream._transformStreamController;\n  const flushPromise = controller._flushAlgorithm();\n  TransformStreamDefaultControllerClearAlgorithms(controller);\n\n  // Return a promise that is fulfilled with undefined on success.\n  return transformPromiseWith(flushPromise, () => {\n    if (readable._state === 'errored') {\n      throw readable._storedError;\n    }\n    ReadableStreamDefaultControllerClose(readable._readableStreamController as ReadableStreamDefaultController<O>);\n  }, r => {\n    TransformStreamError(stream, r);\n    throw readable._storedError;\n  });\n}\n\n// TransformStreamDefaultSource Algorithms\n\nfunction TransformStreamDefaultSourcePullAlgorithm(stream: TransformStream): Promise<void> {\n  // Invariant. Enforced by the promises returned by start() and pull().\n  assert(stream._backpressure);\n\n  assert(stream._backpressureChangePromise !== undefined);\n\n  TransformStreamSetBackpressure(stream, false);\n\n  // Prevent the next pull() call until there is backpressure.\n  return stream._backpressureChangePromise;\n}\n\n// Helper functions for the TransformStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `TransformStreamDefaultController.prototype.${name} can only be used on a TransformStreamDefaultController`);\n}\n\n// Helper functions for the TransformStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `TransformStream.prototype.${name} can only be used on a 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\ No newline at end of file
diff --git a/node_modules/web-streams-polyfill/dist/ponyfill.js b/node_modules/web-streams-polyfill/dist/ponyfill.js
new file mode 100644
index 0000000..96cb3ab
--- /dev/null
+++ b/node_modules/web-streams-polyfill/dist/ponyfill.js
@@ -0,0 +1,4354 @@
+/**
+ * web-streams-polyfill v3.2.1
+ */
+(function (global, factory) {
+    typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
+    typeof define === 'function' && define.amd ? define(['exports'], factory) :
+    (global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.WebStreamsPolyfill = {}));
+}(this, (function (exports) { 'use strict';
+
+    /// <reference lib="es2015.symbol" />
+    var SymbolPolyfill = typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol' ?
+        Symbol :
+        function (description) { return "Symbol(" + description + ")"; };
+
+    /// <reference lib="dom" />
+    function noop() {
+        return undefined;
+    }
+    function getGlobals() {
+        if (typeof self !== 'undefined') {
+            return self;
+        }
+        else if (typeof window !== 'undefined') {
+            return window;
+        }
+        else if (typeof global !== 'undefined') {
+            return global;
+        }
+        return undefined;
+    }
+    var globals = getGlobals();
+
+    function typeIsObject(x) {
+        return (typeof x === 'object' && x !== null) || typeof x === 'function';
+    }
+    var rethrowAssertionErrorRejection = noop;
+
+    var originalPromise = Promise;
+    var originalPromiseThen = Promise.prototype.then;
+    var originalPromiseResolve = Promise.resolve.bind(originalPromise);
+    var originalPromiseReject = Promise.reject.bind(originalPromise);
+    function newPromise(executor) {
+        return new originalPromise(executor);
+    }
+    function promiseResolvedWith(value) {
+        return originalPromiseResolve(value);
+    }
+    function promiseRejectedWith(reason) {
+        return originalPromiseReject(reason);
+    }
+    function PerformPromiseThen(promise, onFulfilled, onRejected) {
+        // There doesn't appear to be any way to correctly emulate the behaviour from JavaScript, so this is just an
+        // approximation.
+        return originalPromiseThen.call(promise, onFulfilled, onRejected);
+    }
+    function uponPromise(promise, onFulfilled, onRejected) {
+        PerformPromiseThen(PerformPromiseThen(promise, onFulfilled, onRejected), undefined, rethrowAssertionErrorRejection);
+    }
+    function uponFulfillment(promise, onFulfilled) {
+        uponPromise(promise, onFulfilled);
+    }
+    function uponRejection(promise, onRejected) {
+        uponPromise(promise, undefined, onRejected);
+    }
+    function transformPromiseWith(promise, fulfillmentHandler, rejectionHandler) {
+        return PerformPromiseThen(promise, fulfillmentHandler, rejectionHandler);
+    }
+    function setPromiseIsHandledToTrue(promise) {
+        PerformPromiseThen(promise, undefined, rethrowAssertionErrorRejection);
+    }
+    var queueMicrotask = (function () {
+        var globalQueueMicrotask = globals && globals.queueMicrotask;
+        if (typeof globalQueueMicrotask === 'function') {
+            return globalQueueMicrotask;
+        }
+        var resolvedPromise = promiseResolvedWith(undefined);
+        return function (fn) { return PerformPromiseThen(resolvedPromise, fn); };
+    })();
+    function reflectCall(F, V, args) {
+        if (typeof F !== 'function') {
+            throw new TypeError('Argument is not a function');
+        }
+        return Function.prototype.apply.call(F, V, args);
+    }
+    function promiseCall(F, V, args) {
+        try {
+            return promiseResolvedWith(reflectCall(F, V, args));
+        }
+        catch (value) {
+            return promiseRejectedWith(value);
+        }
+    }
+
+    // Original from Chromium
+    // https://chromium.googlesource.com/chromium/src/+/0aee4434a4dba42a42abaea9bfbc0cd196a63bc1/third_party/blink/renderer/core/streams/SimpleQueue.js
+    var QUEUE_MAX_ARRAY_SIZE = 16384;
+    /**
+     * Simple queue structure.
+     *
+     * Avoids scalability issues with using a packed array directly by using
+     * multiple arrays in a linked list and keeping the array size bounded.
+     */
+    var SimpleQueue = /** @class */ (function () {
+        function SimpleQueue() {
+            this._cursor = 0;
+            this._size = 0;
+            // _front and _back are always defined.
+            this._front = {
+                _elements: [],
+                _next: undefined
+            };
+            this._back = this._front;
+            // The cursor is used to avoid calling Array.shift().
+            // It contains the index of the front element of the array inside the
+            // front-most node. It is always in the range [0, QUEUE_MAX_ARRAY_SIZE).
+            this._cursor = 0;
+            // When there is only one node, size === elements.length - cursor.
+            this._size = 0;
+        }
+        Object.defineProperty(SimpleQueue.prototype, "length", {
+            get: function () {
+                return this._size;
+            },
+            enumerable: false,
+            configurable: true
+        });
+        // For exception safety, this method is structured in order:
+        // 1. Read state
+        // 2. Calculate required state mutations
+        // 3. Perform state mutations
+        SimpleQueue.prototype.push = function (element) {
+            var oldBack = this._back;
+            var newBack = oldBack;
+            if (oldBack._elements.length === QUEUE_MAX_ARRAY_SIZE - 1) {
+                newBack = {
+                    _elements: [],
+                    _next: undefined
+                };
+            }
+            // push() is the mutation most likely to throw an exception, so it
+            // goes first.
+            oldBack._elements.push(element);
+            if (newBack !== oldBack) {
+                this._back = newBack;
+                oldBack._next = newBack;
+            }
+            ++this._size;
+        };
+        // Like push(), shift() follows the read -> calculate -> mutate pattern for
+        // exception safety.
+        SimpleQueue.prototype.shift = function () { // must not be called on an empty queue
+            var oldFront = this._front;
+            var newFront = oldFront;
+            var oldCursor = this._cursor;
+            var newCursor = oldCursor + 1;
+            var elements = oldFront._elements;
+            var element = elements[oldCursor];
+            if (newCursor === QUEUE_MAX_ARRAY_SIZE) {
+                newFront = oldFront._next;
+                newCursor = 0;
+            }
+            // No mutations before this point.
+            --this._size;
+            this._cursor = newCursor;
+            if (oldFront !== newFront) {
+                this._front = newFront;
+            }
+            // Permit shifted element to be garbage collected.
+            elements[oldCursor] = undefined;
+            return element;
+        };
+        // The tricky thing about forEach() is that it can be called
+        // re-entrantly. The queue may be mutated inside the callback. It is easy to
+        // see that push() within the callback has no negative effects since the end
+        // of the queue is checked for on every iteration. If shift() is called
+        // repeatedly within the callback then the next iteration may return an
+        // element that has been removed. In this case the callback will be called
+        // with undefined values until we either "catch up" with elements that still
+        // exist or reach the back of the queue.
+        SimpleQueue.prototype.forEach = function (callback) {
+            var i = this._cursor;
+            var node = this._front;
+            var elements = node._elements;
+            while (i !== elements.length || node._next !== undefined) {
+                if (i === elements.length) {
+                    node = node._next;
+                    elements = node._elements;
+                    i = 0;
+                    if (elements.length === 0) {
+                        break;
+                    }
+                }
+                callback(elements[i]);
+                ++i;
+            }
+        };
+        // Return the element that would be returned if shift() was called now,
+        // without modifying the queue.
+        SimpleQueue.prototype.peek = function () { // must not be called on an empty queue
+            var front = this._front;
+            var cursor = this._cursor;
+            return front._elements[cursor];
+        };
+        return SimpleQueue;
+    }());
+
+    function ReadableStreamReaderGenericInitialize(reader, stream) {
+        reader._ownerReadableStream = stream;
+        stream._reader = reader;
+        if (stream._state === 'readable') {
+            defaultReaderClosedPromiseInitialize(reader);
+        }
+        else if (stream._state === 'closed') {
+            defaultReaderClosedPromiseInitializeAsResolved(reader);
+        }
+        else {
+            defaultReaderClosedPromiseInitializeAsRejected(reader, stream._storedError);
+        }
+    }
+    // A client of ReadableStreamDefaultReader and ReadableStreamBYOBReader may use these functions directly to bypass state
+    // check.
+    function ReadableStreamReaderGenericCancel(reader, reason) {
+        var stream = reader._ownerReadableStream;
+        return ReadableStreamCancel(stream, reason);
+    }
+    function ReadableStreamReaderGenericRelease(reader) {
+        if (reader._ownerReadableStream._state === 'readable') {
+            defaultReaderClosedPromiseReject(reader, new TypeError("Reader was released and can no longer be used to monitor the stream's closedness"));
+        }
+        else {
+            defaultReaderClosedPromiseResetToRejected(reader, new TypeError("Reader was released and can no longer be used to monitor the stream's closedness"));
+        }
+        reader._ownerReadableStream._reader = undefined;
+        reader._ownerReadableStream = undefined;
+    }
+    // Helper functions for the readers.
+    function readerLockException(name) {
+        return new TypeError('Cannot ' + name + ' a stream using a released reader');
+    }
+    // Helper functions for the ReadableStreamDefaultReader.
+    function defaultReaderClosedPromiseInitialize(reader) {
+        reader._closedPromise = newPromise(function (resolve, reject) {
+            reader._closedPromise_resolve = resolve;
+            reader._closedPromise_reject = reject;
+        });
+    }
+    function defaultReaderClosedPromiseInitializeAsRejected(reader, reason) {
+        defaultReaderClosedPromiseInitialize(reader);
+        defaultReaderClosedPromiseReject(reader, reason);
+    }
+    function defaultReaderClosedPromiseInitializeAsResolved(reader) {
+        defaultReaderClosedPromiseInitialize(reader);
+        defaultReaderClosedPromiseResolve(reader);
+    }
+    function defaultReaderClosedPromiseReject(reader, reason) {
+        if (reader._closedPromise_reject === undefined) {
+            return;
+        }
+        setPromiseIsHandledToTrue(reader._closedPromise);
+        reader._closedPromise_reject(reason);
+        reader._closedPromise_resolve = undefined;
+        reader._closedPromise_reject = undefined;
+    }
+    function defaultReaderClosedPromiseResetToRejected(reader, reason) {
+        defaultReaderClosedPromiseInitializeAsRejected(reader, reason);
+    }
+    function defaultReaderClosedPromiseResolve(reader) {
+        if (reader._closedPromise_resolve === undefined) {
+            return;
+        }
+        reader._closedPromise_resolve(undefined);
+        reader._closedPromise_resolve = undefined;
+        reader._closedPromise_reject = undefined;
+    }
+
+    var AbortSteps = SymbolPolyfill('[[AbortSteps]]');
+    var ErrorSteps = SymbolPolyfill('[[ErrorSteps]]');
+    var CancelSteps = SymbolPolyfill('[[CancelSteps]]');
+    var PullSteps = SymbolPolyfill('[[PullSteps]]');
+
+    /// <reference lib="es2015.core" />
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite#Polyfill
+    var NumberIsFinite = Number.isFinite || function (x) {
+        return typeof x === 'number' && isFinite(x);
+    };
+
+    /// <reference lib="es2015.core" />
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc#Polyfill
+    var MathTrunc = Math.trunc || function (v) {
+        return v < 0 ? Math.ceil(v) : Math.floor(v);
+    };
+
+    // https://heycam.github.io/webidl/#idl-dictionaries
+    function isDictionary(x) {
+        return typeof x === 'object' || typeof x === 'function';
+    }
+    function assertDictionary(obj, context) {
+        if (obj !== undefined && !isDictionary(obj)) {
+            throw new TypeError(context + " is not an object.");
+        }
+    }
+    // https://heycam.github.io/webidl/#idl-callback-functions
+    function assertFunction(x, context) {
+        if (typeof x !== 'function') {
+            throw new TypeError(context + " is not a function.");
+        }
+    }
+    // https://heycam.github.io/webidl/#idl-object
+    function isObject(x) {
+        return (typeof x === 'object' && x !== null) || typeof x === 'function';
+    }
+    function assertObject(x, context) {
+        if (!isObject(x)) {
+            throw new TypeError(context + " is not an object.");
+        }
+    }
+    function assertRequiredArgument(x, position, context) {
+        if (x === undefined) {
+            throw new TypeError("Parameter " + position + " is required in '" + context + "'.");
+        }
+    }
+    function assertRequiredField(x, field, context) {
+        if (x === undefined) {
+            throw new TypeError(field + " is required in '" + context + "'.");
+        }
+    }
+    // https://heycam.github.io/webidl/#idl-unrestricted-double
+    function convertUnrestrictedDouble(value) {
+        return Number(value);
+    }
+    function censorNegativeZero(x) {
+        return x === 0 ? 0 : x;
+    }
+    function integerPart(x) {
+        return censorNegativeZero(MathTrunc(x));
+    }
+    // https://heycam.github.io/webidl/#idl-unsigned-long-long
+    function convertUnsignedLongLongWithEnforceRange(value, context) {
+        var lowerBound = 0;
+        var upperBound = Number.MAX_SAFE_INTEGER;
+        var x = Number(value);
+        x = censorNegativeZero(x);
+        if (!NumberIsFinite(x)) {
+            throw new TypeError(context + " is not a finite number");
+        }
+        x = integerPart(x);
+        if (x < lowerBound || x > upperBound) {
+            throw new TypeError(context + " is outside the accepted range of " + lowerBound + " to " + upperBound + ", inclusive");
+        }
+        if (!NumberIsFinite(x) || x === 0) {
+            return 0;
+        }
+        // TODO Use BigInt if supported?
+        // let xBigInt = BigInt(integerPart(x));
+        // xBigInt = BigInt.asUintN(64, xBigInt);
+        // return Number(xBigInt);
+        return x;
+    }
+
+    function assertReadableStream(x, context) {
+        if (!IsReadableStream(x)) {
+            throw new TypeError(context + " is not a ReadableStream.");
+        }
+    }
+
+    // Abstract operations for the ReadableStream.
+    function AcquireReadableStreamDefaultReader(stream) {
+        return new ReadableStreamDefaultReader(stream);
+    }
+    // ReadableStream API exposed for controllers.
+    function ReadableStreamAddReadRequest(stream, readRequest) {
+        stream._reader._readRequests.push(readRequest);
+    }
+    function ReadableStreamFulfillReadRequest(stream, chunk, done) {
+        var reader = stream._reader;
+        var readRequest = reader._readRequests.shift();
+        if (done) {
+            readRequest._closeSteps();
+        }
+        else {
+            readRequest._chunkSteps(chunk);
+        }
+    }
+    function ReadableStreamGetNumReadRequests(stream) {
+        return stream._reader._readRequests.length;
+    }
+    function ReadableStreamHasDefaultReader(stream) {
+        var reader = stream._reader;
+        if (reader === undefined) {
+            return false;
+        }
+        if (!IsReadableStreamDefaultReader(reader)) {
+            return false;
+        }
+        return true;
+    }
+    /**
+     * A default reader vended by a {@link ReadableStream}.
+     *
+     * @public
+     */
+    var ReadableStreamDefaultReader = /** @class */ (function () {
+        function ReadableStreamDefaultReader(stream) {
+            assertRequiredArgument(stream, 1, 'ReadableStreamDefaultReader');
+            assertReadableStream(stream, 'First parameter');
+            if (IsReadableStreamLocked(stream)) {
+                throw new TypeError('This stream has already been locked for exclusive reading by another reader');
+            }
+            ReadableStreamReaderGenericInitialize(this, stream);
+            this._readRequests = new SimpleQueue();
+        }
+        Object.defineProperty(ReadableStreamDefaultReader.prototype, "closed", {
+            /**
+             * Returns a promise that will be fulfilled when the stream becomes closed,
+             * or rejected if the stream ever errors or the reader's lock is released before the stream finishes closing.
+             */
+            get: function () {
+                if (!IsReadableStreamDefaultReader(this)) {
+                    return promiseRejectedWith(defaultReaderBrandCheckException('closed'));
+                }
+                return this._closedPromise;
+            },
+            enumerable: false,
+            configurable: true
+        });
+        /**
+         * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.
+         */
+        ReadableStreamDefaultReader.prototype.cancel = function (reason) {
+            if (reason === void 0) { reason = undefined; }
+            if (!IsReadableStreamDefaultReader(this)) {
+                return promiseRejectedWith(defaultReaderBrandCheckException('cancel'));
+            }
+            if (this._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('cancel'));
+            }
+            return ReadableStreamReaderGenericCancel(this, reason);
+        };
+        /**
+         * Returns a promise that allows access to the next chunk from the stream's internal queue, if available.
+         *
+         * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.
+         */
+        ReadableStreamDefaultReader.prototype.read = function () {
+            if (!IsReadableStreamDefaultReader(this)) {
+                return promiseRejectedWith(defaultReaderBrandCheckException('read'));
+            }
+            if (this._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('read from'));
+            }
+            var resolvePromise;
+            var rejectPromise;
+            var promise = newPromise(function (resolve, reject) {
+                resolvePromise = resolve;
+                rejectPromise = reject;
+            });
+            var readRequest = {
+                _chunkSteps: function (chunk) { return resolvePromise({ value: chunk, done: false }); },
+                _closeSteps: function () { return resolvePromise({ value: undefined, done: true }); },
+                _errorSteps: function (e) { return rejectPromise(e); }
+            };
+            ReadableStreamDefaultReaderRead(this, readRequest);
+            return promise;
+        };
+        /**
+         * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.
+         * If the associated stream is errored when the lock is released, the reader will appear errored in the same way
+         * from now on; otherwise, the reader will appear closed.
+         *
+         * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by
+         * the reader's {@link ReadableStreamDefaultReader.read | read()} method has not yet been settled. Attempting to
+         * do so will throw a `TypeError` and leave the reader locked to the stream.
+         */
+        ReadableStreamDefaultReader.prototype.releaseLock = function () {
+            if (!IsReadableStreamDefaultReader(this)) {
+                throw defaultReaderBrandCheckException('releaseLock');
+            }
+            if (this._ownerReadableStream === undefined) {
+                return;
+            }
+            if (this._readRequests.length > 0) {
+                throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');
+            }
+            ReadableStreamReaderGenericRelease(this);
+        };
+        return ReadableStreamDefaultReader;
+    }());
+    Object.defineProperties(ReadableStreamDefaultReader.prototype, {
+        cancel: { enumerable: true },
+        read: { enumerable: true },
+        releaseLock: { enumerable: true },
+        closed: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableStreamDefaultReader.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableStreamDefaultReader',
+            configurable: true
+        });
+    }
+    // Abstract operations for the readers.
+    function IsReadableStreamDefaultReader(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_readRequests')) {
+            return false;
+        }
+        return x instanceof ReadableStreamDefaultReader;
+    }
+    function ReadableStreamDefaultReaderRead(reader, readRequest) {
+        var stream = reader._ownerReadableStream;
+        stream._disturbed = true;
+        if (stream._state === 'closed') {
+            readRequest._closeSteps();
+        }
+        else if (stream._state === 'errored') {
+            readRequest._errorSteps(stream._storedError);
+        }
+        else {
+            stream._readableStreamController[PullSteps](readRequest);
+        }
+    }
+    // Helper functions for the ReadableStreamDefaultReader.
+    function defaultReaderBrandCheckException(name) {
+        return new TypeError("ReadableStreamDefaultReader.prototype." + name + " can only be used on a ReadableStreamDefaultReader");
+    }
+
+    /// <reference lib="es2018.asynciterable" />
+    var _a;
+    var AsyncIteratorPrototype;
+    if (typeof SymbolPolyfill.asyncIterator === 'symbol') {
+        // We're running inside a ES2018+ environment, but we're compiling to an older syntax.
+        // We cannot access %AsyncIteratorPrototype% without non-ES2018 syntax, but we can re-create it.
+        AsyncIteratorPrototype = (_a = {},
+            // 25.1.3.1 %AsyncIteratorPrototype% [ @@asyncIterator ] ( )
+            // https://tc39.github.io/ecma262/#sec-asynciteratorprototype-asynciterator
+            _a[SymbolPolyfill.asyncIterator] = function () {
+                return this;
+            },
+            _a);
+        Object.defineProperty(AsyncIteratorPrototype, SymbolPolyfill.asyncIterator, { enumerable: false });
+    }
+
+    /// <reference lib="es2018.asynciterable" />
+    var ReadableStreamAsyncIteratorImpl = /** @class */ (function () {
+        function ReadableStreamAsyncIteratorImpl(reader, preventCancel) {
+            this._ongoingPromise = undefined;
+            this._isFinished = false;
+            this._reader = reader;
+            this._preventCancel = preventCancel;
+        }
+        ReadableStreamAsyncIteratorImpl.prototype.next = function () {
+            var _this = this;
+            var nextSteps = function () { return _this._nextSteps(); };
+            this._ongoingPromise = this._ongoingPromise ?
+                transformPromiseWith(this._ongoingPromise, nextSteps, nextSteps) :
+                nextSteps();
+            return this._ongoingPromise;
+        };
+        ReadableStreamAsyncIteratorImpl.prototype.return = function (value) {
+            var _this = this;
+            var returnSteps = function () { return _this._returnSteps(value); };
+            return this._ongoingPromise ?
+                transformPromiseWith(this._ongoingPromise, returnSteps, returnSteps) :
+                returnSteps();
+        };
+        ReadableStreamAsyncIteratorImpl.prototype._nextSteps = function () {
+            var _this = this;
+            if (this._isFinished) {
+                return Promise.resolve({ value: undefined, done: true });
+            }
+            var reader = this._reader;
+            if (reader._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('iterate'));
+            }
+            var resolvePromise;
+            var rejectPromise;
+            var promise = newPromise(function (resolve, reject) {
+                resolvePromise = resolve;
+                rejectPromise = reject;
+            });
+            var readRequest = {
+                _chunkSteps: function (chunk) {
+                    _this._ongoingPromise = undefined;
+                    // This needs to be delayed by one microtask, otherwise we stop pulling too early which breaks a test.
+                    // FIXME Is this a bug in the specification, or in the test?
+                    queueMicrotask(function () { return resolvePromise({ value: chunk, done: false }); });
+                },
+                _closeSteps: function () {
+                    _this._ongoingPromise = undefined;
+                    _this._isFinished = true;
+                    ReadableStreamReaderGenericRelease(reader);
+                    resolvePromise({ value: undefined, done: true });
+                },
+                _errorSteps: function (reason) {
+                    _this._ongoingPromise = undefined;
+                    _this._isFinished = true;
+                    ReadableStreamReaderGenericRelease(reader);
+                    rejectPromise(reason);
+                }
+            };
+            ReadableStreamDefaultReaderRead(reader, readRequest);
+            return promise;
+        };
+        ReadableStreamAsyncIteratorImpl.prototype._returnSteps = function (value) {
+            if (this._isFinished) {
+                return Promise.resolve({ value: value, done: true });
+            }
+            this._isFinished = true;
+            var reader = this._reader;
+            if (reader._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('finish iterating'));
+            }
+            if (!this._preventCancel) {
+                var result = ReadableStreamReaderGenericCancel(reader, value);
+                ReadableStreamReaderGenericRelease(reader);
+                return transformPromiseWith(result, function () { return ({ value: value, done: true }); });
+            }
+            ReadableStreamReaderGenericRelease(reader);
+            return promiseResolvedWith({ value: value, done: true });
+        };
+        return ReadableStreamAsyncIteratorImpl;
+    }());
+    var ReadableStreamAsyncIteratorPrototype = {
+        next: function () {
+            if (!IsReadableStreamAsyncIterator(this)) {
+                return promiseRejectedWith(streamAsyncIteratorBrandCheckException('next'));
+            }
+            return this._asyncIteratorImpl.next();
+        },
+        return: function (value) {
+            if (!IsReadableStreamAsyncIterator(this)) {
+                return promiseRejectedWith(streamAsyncIteratorBrandCheckException('return'));
+            }
+            return this._asyncIteratorImpl.return(value);
+        }
+    };
+    if (AsyncIteratorPrototype !== undefined) {
+        Object.setPrototypeOf(ReadableStreamAsyncIteratorPrototype, AsyncIteratorPrototype);
+    }
+    // Abstract operations for the ReadableStream.
+    function AcquireReadableStreamAsyncIterator(stream, preventCancel) {
+        var reader = AcquireReadableStreamDefaultReader(stream);
+        var impl = new ReadableStreamAsyncIteratorImpl(reader, preventCancel);
+        var iterator = Object.create(ReadableStreamAsyncIteratorPrototype);
+        iterator._asyncIteratorImpl = impl;
+        return iterator;
+    }
+    function IsReadableStreamAsyncIterator(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_asyncIteratorImpl')) {
+            return false;
+        }
+        try {
+            // noinspection SuspiciousTypeOfGuard
+            return x._asyncIteratorImpl instanceof
+                ReadableStreamAsyncIteratorImpl;
+        }
+        catch (_a) {
+            return false;
+        }
+    }
+    // Helper functions for the ReadableStream.
+    function streamAsyncIteratorBrandCheckException(name) {
+        return new TypeError("ReadableStreamAsyncIterator." + name + " can only be used on a ReadableSteamAsyncIterator");
+    }
+
+    /// <reference lib="es2015.core" />
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Polyfill
+    var NumberIsNaN = Number.isNaN || function (x) {
+        // eslint-disable-next-line no-self-compare
+        return x !== x;
+    };
+
+    function CreateArrayFromList(elements) {
+        // We use arrays to represent lists, so this is basically a no-op.
+        // Do a slice though just in case we happen to depend on the unique-ness.
+        return elements.slice();
+    }
+    function CopyDataBlockBytes(dest, destOffset, src, srcOffset, n) {
+        new Uint8Array(dest).set(new Uint8Array(src, srcOffset, n), destOffset);
+    }
+    // Not implemented correctly
+    function TransferArrayBuffer(O) {
+        return O;
+    }
+    // Not implemented correctly
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    function IsDetachedBuffer(O) {
+        return false;
+    }
+    function ArrayBufferSlice(buffer, begin, end) {
+        // ArrayBuffer.prototype.slice is not available on IE10
+        // https://www.caniuse.com/mdn-javascript_builtins_arraybuffer_slice
+        if (buffer.slice) {
+            return buffer.slice(begin, end);
+        }
+        var length = end - begin;
+        var slice = new ArrayBuffer(length);
+        CopyDataBlockBytes(slice, 0, buffer, begin, length);
+        return slice;
+    }
+
+    function IsNonNegativeNumber(v) {
+        if (typeof v !== 'number') {
+            return false;
+        }
+        if (NumberIsNaN(v)) {
+            return false;
+        }
+        if (v < 0) {
+            return false;
+        }
+        return true;
+    }
+    function CloneAsUint8Array(O) {
+        var buffer = ArrayBufferSlice(O.buffer, O.byteOffset, O.byteOffset + O.byteLength);
+        return new Uint8Array(buffer);
+    }
+
+    function DequeueValue(container) {
+        var pair = container._queue.shift();
+        container._queueTotalSize -= pair.size;
+        if (container._queueTotalSize < 0) {
+            container._queueTotalSize = 0;
+        }
+        return pair.value;
+    }
+    function EnqueueValueWithSize(container, value, size) {
+        if (!IsNonNegativeNumber(size) || size === Infinity) {
+            throw new RangeError('Size must be a finite, non-NaN, non-negative number.');
+        }
+        container._queue.push({ value: value, size: size });
+        container._queueTotalSize += size;
+    }
+    function PeekQueueValue(container) {
+        var pair = container._queue.peek();
+        return pair.value;
+    }
+    function ResetQueue(container) {
+        container._queue = new SimpleQueue();
+        container._queueTotalSize = 0;
+    }
+
+    /**
+     * A pull-into request in a {@link ReadableByteStreamController}.
+     *
+     * @public
+     */
+    var ReadableStreamBYOBRequest = /** @class */ (function () {
+        function ReadableStreamBYOBRequest() {
+            throw new TypeError('Illegal constructor');
+        }
+        Object.defineProperty(ReadableStreamBYOBRequest.prototype, "view", {
+            /**
+             * Returns the view for writing in to, or `null` if the BYOB request has already been responded to.
+             */
+            get: function () {
+                if (!IsReadableStreamBYOBRequest(this)) {
+                    throw byobRequestBrandCheckException('view');
+                }
+                return this._view;
+            },
+            enumerable: false,
+            configurable: true
+        });
+        ReadableStreamBYOBRequest.prototype.respond = function (bytesWritten) {
+            if (!IsReadableStreamBYOBRequest(this)) {
+                throw byobRequestBrandCheckException('respond');
+            }
+            assertRequiredArgument(bytesWritten, 1, 'respond');
+            bytesWritten = convertUnsignedLongLongWithEnforceRange(bytesWritten, 'First parameter');
+            if (this._associatedReadableByteStreamController === undefined) {
+                throw new TypeError('This BYOB request has been invalidated');
+            }
+            if (IsDetachedBuffer(this._view.buffer)) ;
+            ReadableByteStreamControllerRespond(this._associatedReadableByteStreamController, bytesWritten);
+        };
+        ReadableStreamBYOBRequest.prototype.respondWithNewView = function (view) {
+            if (!IsReadableStreamBYOBRequest(this)) {
+                throw byobRequestBrandCheckException('respondWithNewView');
+            }
+            assertRequiredArgument(view, 1, 'respondWithNewView');
+            if (!ArrayBuffer.isView(view)) {
+                throw new TypeError('You can only respond with array buffer views');
+            }
+            if (this._associatedReadableByteStreamController === undefined) {
+                throw new TypeError('This BYOB request has been invalidated');
+            }
+            if (IsDetachedBuffer(view.buffer)) ;
+            ReadableByteStreamControllerRespondWithNewView(this._associatedReadableByteStreamController, view);
+        };
+        return ReadableStreamBYOBRequest;
+    }());
+    Object.defineProperties(ReadableStreamBYOBRequest.prototype, {
+        respond: { enumerable: true },
+        respondWithNewView: { enumerable: true },
+        view: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableStreamBYOBRequest.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableStreamBYOBRequest',
+            configurable: true
+        });
+    }
+    /**
+     * Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue.
+     *
+     * @public
+     */
+    var ReadableByteStreamController = /** @class */ (function () {
+        function ReadableByteStreamController() {
+            throw new TypeError('Illegal constructor');
+        }
+        Object.defineProperty(ReadableByteStreamController.prototype, "byobRequest", {
+            /**
+             * Returns the current BYOB pull request, or `null` if there isn't one.
+             */
+            get: function () {
+                if (!IsReadableByteStreamController(this)) {
+                    throw byteStreamControllerBrandCheckException('byobRequest');
+                }
+                return ReadableByteStreamControllerGetBYOBRequest(this);
+            },
+            enumerable: false,
+            configurable: true
+        });
+        Object.defineProperty(ReadableByteStreamController.prototype, "desiredSize", {
+            /**
+             * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is
+             * over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure.
+             */
+            get: function () {
+                if (!IsReadableByteStreamController(this)) {
+                    throw byteStreamControllerBrandCheckException('desiredSize');
+                }
+                return ReadableByteStreamControllerGetDesiredSize(this);
+            },
+            enumerable: false,
+            configurable: true
+        });
+        /**
+         * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from
+         * the stream, but once those are read, the stream will become closed.
+         */
+        ReadableByteStreamController.prototype.close = function () {
+            if (!IsReadableByteStreamController(this)) {
+                throw byteStreamControllerBrandCheckException('close');
+            }
+            if (this._closeRequested) {
+                throw new TypeError('The stream has already been closed; do not close it again!');
+            }
+            var state = this._controlledReadableByteStream._state;
+            if (state !== 'readable') {
+                throw new TypeError("The stream (in " + state + " state) is not in the readable state and cannot be closed");
+            }
+            ReadableByteStreamControllerClose(this);
+        };
+        ReadableByteStreamController.prototype.enqueue = function (chunk) {
+            if (!IsReadableByteStreamController(this)) {
+                throw byteStreamControllerBrandCheckException('enqueue');
+            }
+            assertRequiredArgument(chunk, 1, 'enqueue');
+            if (!ArrayBuffer.isView(chunk)) {
+                throw new TypeError('chunk must be an array buffer view');
+            }
+            if (chunk.byteLength === 0) {
+                throw new TypeError('chunk must have non-zero byteLength');
+            }
+            if (chunk.buffer.byteLength === 0) {
+                throw new TypeError("chunk's buffer must have non-zero byteLength");
+            }
+            if (this._closeRequested) {
+                throw new TypeError('stream is closed or draining');
+            }
+            var state = this._controlledReadableByteStream._state;
+            if (state !== 'readable') {
+                throw new TypeError("The stream (in " + state + " state) is not in the readable state and cannot be enqueued to");
+            }
+            ReadableByteStreamControllerEnqueue(this, chunk);
+        };
+        /**
+         * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.
+         */
+        ReadableByteStreamController.prototype.error = function (e) {
+            if (e === void 0) { e = undefined; }
+            if (!IsReadableByteStreamController(this)) {
+                throw byteStreamControllerBrandCheckException('error');
+            }
+            ReadableByteStreamControllerError(this, e);
+        };
+        /** @internal */
+        ReadableByteStreamController.prototype[CancelSteps] = function (reason) {
+            ReadableByteStreamControllerClearPendingPullIntos(this);
+            ResetQueue(this);
+            var result = this._cancelAlgorithm(reason);
+            ReadableByteStreamControllerClearAlgorithms(this);
+            return result;
+        };
+        /** @internal */
+        ReadableByteStreamController.prototype[PullSteps] = function (readRequest) {
+            var stream = this._controlledReadableByteStream;
+            if (this._queueTotalSize > 0) {
+                var entry = this._queue.shift();
+                this._queueTotalSize -= entry.byteLength;
+                ReadableByteStreamControllerHandleQueueDrain(this);
+                var view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);
+                readRequest._chunkSteps(view);
+                return;
+            }
+            var autoAllocateChunkSize = this._autoAllocateChunkSize;
+            if (autoAllocateChunkSize !== undefined) {
+                var buffer = void 0;
+                try {
+                    buffer = new ArrayBuffer(autoAllocateChunkSize);
+                }
+                catch (bufferE) {
+                    readRequest._errorSteps(bufferE);
+                    return;
+                }
+                var pullIntoDescriptor = {
+                    buffer: buffer,
+                    bufferByteLength: autoAllocateChunkSize,
+                    byteOffset: 0,
+                    byteLength: autoAllocateChunkSize,
+                    bytesFilled: 0,
+                    elementSize: 1,
+                    viewConstructor: Uint8Array,
+                    readerType: 'default'
+                };
+                this._pendingPullIntos.push(pullIntoDescriptor);
+            }
+            ReadableStreamAddReadRequest(stream, readRequest);
+            ReadableByteStreamControllerCallPullIfNeeded(this);
+        };
+        return ReadableByteStreamController;
+    }());
+    Object.defineProperties(ReadableByteStreamController.prototype, {
+        close: { enumerable: true },
+        enqueue: { enumerable: true },
+        error: { enumerable: true },
+        byobRequest: { enumerable: true },
+        desiredSize: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableByteStreamController.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableByteStreamController',
+            configurable: true
+        });
+    }
+    // Abstract operations for the ReadableByteStreamController.
+    function IsReadableByteStreamController(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableByteStream')) {
+            return false;
+        }
+        return x instanceof ReadableByteStreamController;
+    }
+    function IsReadableStreamBYOBRequest(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_associatedReadableByteStreamController')) {
+            return false;
+        }
+        return x instanceof ReadableStreamBYOBRequest;
+    }
+    function ReadableByteStreamControllerCallPullIfNeeded(controller) {
+        var shouldPull = ReadableByteStreamControllerShouldCallPull(controller);
+        if (!shouldPull) {
+            return;
+        }
+        if (controller._pulling) {
+            controller._pullAgain = true;
+            return;
+        }
+        controller._pulling = true;
+        // TODO: Test controller argument
+        var pullPromise = controller._pullAlgorithm();
+        uponPromise(pullPromise, function () {
+            controller._pulling = false;
+            if (controller._pullAgain) {
+                controller._pullAgain = false;
+                ReadableByteStreamControllerCallPullIfNeeded(controller);
+            }
+        }, function (e) {
+            ReadableByteStreamControllerError(controller, e);
+        });
+    }
+    function ReadableByteStreamControllerClearPendingPullIntos(controller) {
+        ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+        controller._pendingPullIntos = new SimpleQueue();
+    }
+    function ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor) {
+        var done = false;
+        if (stream._state === 'closed') {
+            done = true;
+        }
+        var filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor);
+        if (pullIntoDescriptor.readerType === 'default') {
+            ReadableStreamFulfillReadRequest(stream, filledView, done);
+        }
+        else {
+            ReadableStreamFulfillReadIntoRequest(stream, filledView, done);
+        }
+    }
+    function ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor) {
+        var bytesFilled = pullIntoDescriptor.bytesFilled;
+        var elementSize = pullIntoDescriptor.elementSize;
+        return new pullIntoDescriptor.viewConstructor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize);
+    }
+    function ReadableByteStreamControllerEnqueueChunkToQueue(controller, buffer, byteOffset, byteLength) {
+        controller._queue.push({ buffer: buffer, byteOffset: byteOffset, byteLength: byteLength });
+        controller._queueTotalSize += byteLength;
+    }
+    function ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor) {
+        var elementSize = pullIntoDescriptor.elementSize;
+        var currentAlignedBytes = pullIntoDescriptor.bytesFilled - pullIntoDescriptor.bytesFilled % elementSize;
+        var maxBytesToCopy = Math.min(controller._queueTotalSize, pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled);
+        var maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;
+        var maxAlignedBytes = maxBytesFilled - maxBytesFilled % elementSize;
+        var totalBytesToCopyRemaining = maxBytesToCopy;
+        var ready = false;
+        if (maxAlignedBytes > currentAlignedBytes) {
+            totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled;
+            ready = true;
+        }
+        var queue = controller._queue;
+        while (totalBytesToCopyRemaining > 0) {
+            var headOfQueue = queue.peek();
+            var bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength);
+            var destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;
+            CopyDataBlockBytes(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy);
+            if (headOfQueue.byteLength === bytesToCopy) {
+                queue.shift();
+            }
+            else {
+                headOfQueue.byteOffset += bytesToCopy;
+                headOfQueue.byteLength -= bytesToCopy;
+            }
+            controller._queueTotalSize -= bytesToCopy;
+            ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor);
+            totalBytesToCopyRemaining -= bytesToCopy;
+        }
+        return ready;
+    }
+    function ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, size, pullIntoDescriptor) {
+        pullIntoDescriptor.bytesFilled += size;
+    }
+    function ReadableByteStreamControllerHandleQueueDrain(controller) {
+        if (controller._queueTotalSize === 0 && controller._closeRequested) {
+            ReadableByteStreamControllerClearAlgorithms(controller);
+            ReadableStreamClose(controller._controlledReadableByteStream);
+        }
+        else {
+            ReadableByteStreamControllerCallPullIfNeeded(controller);
+        }
+    }
+    function ReadableByteStreamControllerInvalidateBYOBRequest(controller) {
+        if (controller._byobRequest === null) {
+            return;
+        }
+        controller._byobRequest._associatedReadableByteStreamController = undefined;
+        controller._byobRequest._view = null;
+        controller._byobRequest = null;
+    }
+    function ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller) {
+        while (controller._pendingPullIntos.length > 0) {
+            if (controller._queueTotalSize === 0) {
+                return;
+            }
+            var pullIntoDescriptor = controller._pendingPullIntos.peek();
+            if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {
+                ReadableByteStreamControllerShiftPendingPullInto(controller);
+                ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);
+            }
+        }
+    }
+    function ReadableByteStreamControllerPullInto(controller, view, readIntoRequest) {
+        var stream = controller._controlledReadableByteStream;
+        var elementSize = 1;
+        if (view.constructor !== DataView) {
+            elementSize = view.constructor.BYTES_PER_ELEMENT;
+        }
+        var ctor = view.constructor;
+        // try {
+        var buffer = TransferArrayBuffer(view.buffer);
+        // } catch (e) {
+        //   readIntoRequest._errorSteps(e);
+        //   return;
+        // }
+        var pullIntoDescriptor = {
+            buffer: buffer,
+            bufferByteLength: buffer.byteLength,
+            byteOffset: view.byteOffset,
+            byteLength: view.byteLength,
+            bytesFilled: 0,
+            elementSize: elementSize,
+            viewConstructor: ctor,
+            readerType: 'byob'
+        };
+        if (controller._pendingPullIntos.length > 0) {
+            controller._pendingPullIntos.push(pullIntoDescriptor);
+            // No ReadableByteStreamControllerCallPullIfNeeded() call since:
+            // - No change happens on desiredSize
+            // - The source has already been notified of that there's at least 1 pending read(view)
+            ReadableStreamAddReadIntoRequest(stream, readIntoRequest);
+            return;
+        }
+        if (stream._state === 'closed') {
+            var emptyView = new ctor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0);
+            readIntoRequest._closeSteps(emptyView);
+            return;
+        }
+        if (controller._queueTotalSize > 0) {
+            if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {
+                var filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor);
+                ReadableByteStreamControllerHandleQueueDrain(controller);
+                readIntoRequest._chunkSteps(filledView);
+                return;
+            }
+            if (controller._closeRequested) {
+                var e = new TypeError('Insufficient bytes to fill elements in the given buffer');
+                ReadableByteStreamControllerError(controller, e);
+                readIntoRequest._errorSteps(e);
+                return;
+            }
+        }
+        controller._pendingPullIntos.push(pullIntoDescriptor);
+        ReadableStreamAddReadIntoRequest(stream, readIntoRequest);
+        ReadableByteStreamControllerCallPullIfNeeded(controller);
+    }
+    function ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor) {
+        var stream = controller._controlledReadableByteStream;
+        if (ReadableStreamHasBYOBReader(stream)) {
+            while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {
+                var pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);
+                ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);
+            }
+        }
+    }
+    function ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, pullIntoDescriptor) {
+        ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor);
+        if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {
+            return;
+        }
+        ReadableByteStreamControllerShiftPendingPullInto(controller);
+        var remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize;
+        if (remainderSize > 0) {
+            var end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;
+            var remainder = ArrayBufferSlice(pullIntoDescriptor.buffer, end - remainderSize, end);
+            ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength);
+        }
+        pullIntoDescriptor.bytesFilled -= remainderSize;
+        ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);
+        ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);
+    }
+    function ReadableByteStreamControllerRespondInternal(controller, bytesWritten) {
+        var firstDescriptor = controller._pendingPullIntos.peek();
+        ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+        var state = controller._controlledReadableByteStream._state;
+        if (state === 'closed') {
+            ReadableByteStreamControllerRespondInClosedState(controller);
+        }
+        else {
+            ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);
+        }
+        ReadableByteStreamControllerCallPullIfNeeded(controller);
+    }
+    function ReadableByteStreamControllerShiftPendingPullInto(controller) {
+        var descriptor = controller._pendingPullIntos.shift();
+        return descriptor;
+    }
+    function ReadableByteStreamControllerShouldCallPull(controller) {
+        var stream = controller._controlledReadableByteStream;
+        if (stream._state !== 'readable') {
+            return false;
+        }
+        if (controller._closeRequested) {
+            return false;
+        }
+        if (!controller._started) {
+            return false;
+        }
+        if (ReadableStreamHasDefaultReader(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+            return true;
+        }
+        if (ReadableStreamHasBYOBReader(stream) && ReadableStreamGetNumReadIntoRequests(stream) > 0) {
+            return true;
+        }
+        var desiredSize = ReadableByteStreamControllerGetDesiredSize(controller);
+        if (desiredSize > 0) {
+            return true;
+        }
+        return false;
+    }
+    function ReadableByteStreamControllerClearAlgorithms(controller) {
+        controller._pullAlgorithm = undefined;
+        controller._cancelAlgorithm = undefined;
+    }
+    // A client of ReadableByteStreamController may use these functions directly to bypass state check.
+    function ReadableByteStreamControllerClose(controller) {
+        var stream = controller._controlledReadableByteStream;
+        if (controller._closeRequested || stream._state !== 'readable') {
+            return;
+        }
+        if (controller._queueTotalSize > 0) {
+            controller._closeRequested = true;
+            return;
+        }
+        if (controller._pendingPullIntos.length > 0) {
+            var firstPendingPullInto = controller._pendingPullIntos.peek();
+            if (firstPendingPullInto.bytesFilled > 0) {
+                var e = new TypeError('Insufficient bytes to fill elements in the given buffer');
+                ReadableByteStreamControllerError(controller, e);
+                throw e;
+            }
+        }
+        ReadableByteStreamControllerClearAlgorithms(controller);
+        ReadableStreamClose(stream);
+    }
+    function ReadableByteStreamControllerEnqueue(controller, chunk) {
+        var stream = controller._controlledReadableByteStream;
+        if (controller._closeRequested || stream._state !== 'readable') {
+            return;
+        }
+        var buffer = chunk.buffer;
+        var byteOffset = chunk.byteOffset;
+        var byteLength = chunk.byteLength;
+        var transferredBuffer = TransferArrayBuffer(buffer);
+        if (controller._pendingPullIntos.length > 0) {
+            var firstPendingPullInto = controller._pendingPullIntos.peek();
+            if (IsDetachedBuffer(firstPendingPullInto.buffer)) ;
+            firstPendingPullInto.buffer = TransferArrayBuffer(firstPendingPullInto.buffer);
+        }
+        ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+        if (ReadableStreamHasDefaultReader(stream)) {
+            if (ReadableStreamGetNumReadRequests(stream) === 0) {
+                ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+            }
+            else {
+                if (controller._pendingPullIntos.length > 0) {
+                    ReadableByteStreamControllerShiftPendingPullInto(controller);
+                }
+                var transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength);
+                ReadableStreamFulfillReadRequest(stream, transferredView, false);
+            }
+        }
+        else if (ReadableStreamHasBYOBReader(stream)) {
+            // TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully.
+            ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+            ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);
+        }
+        else {
+            ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+        }
+        ReadableByteStreamControllerCallPullIfNeeded(controller);
+    }
+    function ReadableByteStreamControllerError(controller, e) {
+        var stream = controller._controlledReadableByteStream;
+        if (stream._state !== 'readable') {
+            return;
+        }
+        ReadableByteStreamControllerClearPendingPullIntos(controller);
+        ResetQueue(controller);
+        ReadableByteStreamControllerClearAlgorithms(controller);
+        ReadableStreamError(stream, e);
+    }
+    function ReadableByteStreamControllerGetBYOBRequest(controller) {
+        if (controller._byobRequest === null && controller._pendingPullIntos.length > 0) {
+            var firstDescriptor = controller._pendingPullIntos.peek();
+            var view = new Uint8Array(firstDescriptor.buffer, firstDescriptor.byteOffset + firstDescriptor.bytesFilled, firstDescriptor.byteLength - firstDescriptor.bytesFilled);
+            var byobRequest = Object.create(ReadableStreamBYOBRequest.prototype);
+            SetUpReadableStreamBYOBRequest(byobRequest, controller, view);
+            controller._byobRequest = byobRequest;
+        }
+        return controller._byobRequest;
+    }
+    function ReadableByteStreamControllerGetDesiredSize(controller) {
+        var state = controller._controlledReadableByteStream._state;
+        if (state === 'errored') {
+            return null;
+        }
+        if (state === 'closed') {
+            return 0;
+        }
+        return controller._strategyHWM - controller._queueTotalSize;
+    }
+    function ReadableByteStreamControllerRespond(controller, bytesWritten) {
+        var firstDescriptor = controller._pendingPullIntos.peek();
+        var state = controller._controlledReadableByteStream._state;
+        if (state === 'closed') {
+            if (bytesWritten !== 0) {
+                throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream');
+            }
+        }
+        else {
+            if (bytesWritten === 0) {
+                throw new TypeError('bytesWritten must be greater than 0 when calling respond() on a readable stream');
+            }
+            if (firstDescriptor.bytesFilled + bytesWritten > firstDescriptor.byteLength) {
+                throw new RangeError('bytesWritten out of range');
+            }
+        }
+        firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer);
+        ReadableByteStreamControllerRespondInternal(controller, bytesWritten);
+    }
+    function ReadableByteStreamControllerRespondWithNewView(controller, view) {
+        var firstDescriptor = controller._pendingPullIntos.peek();
+        var state = controller._controlledReadableByteStream._state;
+        if (state === 'closed') {
+            if (view.byteLength !== 0) {
+                throw new TypeError('The view\'s length must be 0 when calling respondWithNewView() on a closed stream');
+            }
+        }
+        else {
+            if (view.byteLength === 0) {
+                throw new TypeError('The view\'s length must be greater than 0 when calling respondWithNewView() on a readable stream');
+            }
+        }
+        if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) {
+            throw new RangeError('The region specified by view does not match byobRequest');
+        }
+        if (firstDescriptor.bufferByteLength !== view.buffer.byteLength) {
+            throw new RangeError('The buffer of view has different capacity than byobRequest');
+        }
+        if (firstDescriptor.bytesFilled + view.byteLength > firstDescriptor.byteLength) {
+            throw new RangeError('The region specified by view is larger than byobRequest');
+        }
+        var viewByteLength = view.byteLength;
+        firstDescriptor.buffer = TransferArrayBuffer(view.buffer);
+        ReadableByteStreamControllerRespondInternal(controller, viewByteLength);
+    }
+    function SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize) {
+        controller._controlledReadableByteStream = stream;
+        controller._pullAgain = false;
+        controller._pulling = false;
+        controller._byobRequest = null;
+        // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.
+        controller._queue = controller._queueTotalSize = undefined;
+        ResetQueue(controller);
+        controller._closeRequested = false;
+        controller._started = false;
+        controller._strategyHWM = highWaterMark;
+        controller._pullAlgorithm = pullAlgorithm;
+        controller._cancelAlgorithm = cancelAlgorithm;
+        controller._autoAllocateChunkSize = autoAllocateChunkSize;
+        controller._pendingPullIntos = new SimpleQueue();
+        stream._readableStreamController = controller;
+        var startResult = startAlgorithm();
+        uponPromise(promiseResolvedWith(startResult), function () {
+            controller._started = true;
+            ReadableByteStreamControllerCallPullIfNeeded(controller);
+        }, function (r) {
+            ReadableByteStreamControllerError(controller, r);
+        });
+    }
+    function SetUpReadableByteStreamControllerFromUnderlyingSource(stream, underlyingByteSource, highWaterMark) {
+        var controller = Object.create(ReadableByteStreamController.prototype);
+        var startAlgorithm = function () { return undefined; };
+        var pullAlgorithm = function () { return promiseResolvedWith(undefined); };
+        var cancelAlgorithm = function () { return promiseResolvedWith(undefined); };
+        if (underlyingByteSource.start !== undefined) {
+            startAlgorithm = function () { return underlyingByteSource.start(controller); };
+        }
+        if (underlyingByteSource.pull !== undefined) {
+            pullAlgorithm = function () { return underlyingByteSource.pull(controller); };
+        }
+        if (underlyingByteSource.cancel !== undefined) {
+            cancelAlgorithm = function (reason) { return underlyingByteSource.cancel(reason); };
+        }
+        var autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;
+        if (autoAllocateChunkSize === 0) {
+            throw new TypeError('autoAllocateChunkSize must be greater than 0');
+        }
+        SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize);
+    }
+    function SetUpReadableStreamBYOBRequest(request, controller, view) {
+        request._associatedReadableByteStreamController = controller;
+        request._view = view;
+    }
+    // Helper functions for the ReadableStreamBYOBRequest.
+    function byobRequestBrandCheckException(name) {
+        return new TypeError("ReadableStreamBYOBRequest.prototype." + name + " can only be used on a ReadableStreamBYOBRequest");
+    }
+    // Helper functions for the ReadableByteStreamController.
+    function byteStreamControllerBrandCheckException(name) {
+        return new TypeError("ReadableByteStreamController.prototype." + name + " can only be used on a ReadableByteStreamController");
+    }
+
+    // Abstract operations for the ReadableStream.
+    function AcquireReadableStreamBYOBReader(stream) {
+        return new ReadableStreamBYOBReader(stream);
+    }
+    // ReadableStream API exposed for controllers.
+    function ReadableStreamAddReadIntoRequest(stream, readIntoRequest) {
+        stream._reader._readIntoRequests.push(readIntoRequest);
+    }
+    function ReadableStreamFulfillReadIntoRequest(stream, chunk, done) {
+        var reader = stream._reader;
+        var readIntoRequest = reader._readIntoRequests.shift();
+        if (done) {
+            readIntoRequest._closeSteps(chunk);
+        }
+        else {
+            readIntoRequest._chunkSteps(chunk);
+        }
+    }
+    function ReadableStreamGetNumReadIntoRequests(stream) {
+        return stream._reader._readIntoRequests.length;
+    }
+    function ReadableStreamHasBYOBReader(stream) {
+        var reader = stream._reader;
+        if (reader === undefined) {
+            return false;
+        }
+        if (!IsReadableStreamBYOBReader(reader)) {
+            return false;
+        }
+        return true;
+    }
+    /**
+     * A BYOB reader vended by a {@link ReadableStream}.
+     *
+     * @public
+     */
+    var ReadableStreamBYOBReader = /** @class */ (function () {
+        function ReadableStreamBYOBReader(stream) {
+            assertRequiredArgument(stream, 1, 'ReadableStreamBYOBReader');
+            assertReadableStream(stream, 'First parameter');
+            if (IsReadableStreamLocked(stream)) {
+                throw new TypeError('This stream has already been locked for exclusive reading by another reader');
+            }
+            if (!IsReadableByteStreamController(stream._readableStreamController)) {
+                throw new TypeError('Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte ' +
+                    'source');
+            }
+            ReadableStreamReaderGenericInitialize(this, stream);
+            this._readIntoRequests = new SimpleQueue();
+        }
+        Object.defineProperty(ReadableStreamBYOBReader.prototype, "closed", {
+            /**
+             * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or
+             * the reader's lock is released before the stream finishes closing.
+             */
+            get: function () {
+                if (!IsReadableStreamBYOBReader(this)) {
+                    return promiseRejectedWith(byobReaderBrandCheckException('closed'));
+                }
+                return this._closedPromise;
+            },
+            enumerable: false,
+            configurable: true
+        });
+        /**
+         * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.
+         */
+        ReadableStreamBYOBReader.prototype.cancel = function (reason) {
+            if (reason === void 0) { reason = undefined; }
+            if (!IsReadableStreamBYOBReader(this)) {
+                return promiseRejectedWith(byobReaderBrandCheckException('cancel'));
+            }
+            if (this._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('cancel'));
+            }
+            return ReadableStreamReaderGenericCancel(this, reason);
+        };
+        /**
+         * Attempts to reads bytes into view, and returns a promise resolved with the result.
+         *
+         * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.
+         */
+        ReadableStreamBYOBReader.prototype.read = function (view) {
+            if (!IsReadableStreamBYOBReader(this)) {
+                return promiseRejectedWith(byobReaderBrandCheckException('read'));
+            }
+            if (!ArrayBuffer.isView(view)) {
+                return promiseRejectedWith(new TypeError('view must be an array buffer view'));
+            }
+            if (view.byteLength === 0) {
+                return promiseRejectedWith(new TypeError('view must have non-zero byteLength'));
+            }
+            if (view.buffer.byteLength === 0) {
+                return promiseRejectedWith(new TypeError("view's buffer must have non-zero byteLength"));
+            }
+            if (IsDetachedBuffer(view.buffer)) ;
+            if (this._ownerReadableStream === undefined) {
+                return promiseRejectedWith(readerLockException('read from'));
+            }
+            var resolvePromise;
+            var rejectPromise;
+            var promise = newPromise(function (resolve, reject) {
+                resolvePromise = resolve;
+                rejectPromise = reject;
+            });
+            var readIntoRequest = {
+                _chunkSteps: function (chunk) { return resolvePromise({ value: chunk, done: false }); },
+                _closeSteps: function (chunk) { return resolvePromise({ value: chunk, done: true }); },
+                _errorSteps: function (e) { return rejectPromise(e); }
+            };
+            ReadableStreamBYOBReaderRead(this, view, readIntoRequest);
+            return promise;
+        };
+        /**
+         * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.
+         * If the associated stream is errored when the lock is released, the reader will appear errored in the same way
+         * from now on; otherwise, the reader will appear closed.
+         *
+         * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by
+         * the reader's {@link ReadableStreamBYOBReader.read | read()} method has not yet been settled. Attempting to
+         * do so will throw a `TypeError` and leave the reader locked to the stream.
+         */
+        ReadableStreamBYOBReader.prototype.releaseLock = function () {
+            if (!IsReadableStreamBYOBReader(this)) {
+                throw byobReaderBrandCheckException('releaseLock');
+            }
+            if (this._ownerReadableStream === undefined) {
+                return;
+            }
+            if (this._readIntoRequests.length > 0) {
+                throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');
+            }
+            ReadableStreamReaderGenericRelease(this);
+        };
+        return ReadableStreamBYOBReader;
+    }());
+    Object.defineProperties(ReadableStreamBYOBReader.prototype, {
+        cancel: { enumerable: true },
+        read: { enumerable: true },
+        releaseLock: { enumerable: true },
+        closed: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableStreamBYOBReader.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableStreamBYOBReader',
+            configurable: true
+        });
+    }
+    // Abstract operations for the readers.
+    function IsReadableStreamBYOBReader(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_readIntoRequests')) {
+            return false;
+        }
+        return x instanceof ReadableStreamBYOBReader;
+    }
+    function ReadableStreamBYOBReaderRead(reader, view, readIntoRequest) {
+        var stream = reader._ownerReadableStream;
+        stream._disturbed = true;
+        if (stream._state === 'errored') {
+            readIntoRequest._errorSteps(stream._storedError);
+        }
+        else {
+            ReadableByteStreamControllerPullInto(stream._readableStreamController, view, readIntoRequest);
+        }
+    }
+    // Helper functions for the ReadableStreamBYOBReader.
+    function byobReaderBrandCheckException(name) {
+        return new TypeError("ReadableStreamBYOBReader.prototype." + name + " can only be used on a ReadableStreamBYOBReader");
+    }
+
+    function ExtractHighWaterMark(strategy, defaultHWM) {
+        var highWaterMark = strategy.highWaterMark;
+        if (highWaterMark === undefined) {
+            return defaultHWM;
+        }
+        if (NumberIsNaN(highWaterMark) || highWaterMark < 0) {
+            throw new RangeError('Invalid highWaterMark');
+        }
+        return highWaterMark;
+    }
+    function ExtractSizeAlgorithm(strategy) {
+        var size = strategy.size;
+        if (!size) {
+            return function () { return 1; };
+        }
+        return size;
+    }
+
+    function convertQueuingStrategy(init, context) {
+        assertDictionary(init, context);
+        var highWaterMark = init === null || init === void 0 ? void 0 : init.highWaterMark;
+        var size = init === null || init === void 0 ? void 0 : init.size;
+        return {
+            highWaterMark: highWaterMark === undefined ? undefined : convertUnrestrictedDouble(highWaterMark),
+            size: size === undefined ? undefined : convertQueuingStrategySize(size, context + " has member 'size' that")
+        };
+    }
+    function convertQueuingStrategySize(fn, context) {
+        assertFunction(fn, context);
+        return function (chunk) { return convertUnrestrictedDouble(fn(chunk)); };
+    }
+
+    function convertUnderlyingSink(original, context) {
+        assertDictionary(original, context);
+        var abort = original === null || original === void 0 ? void 0 : original.abort;
+        var close = original === null || original === void 0 ? void 0 : original.close;
+        var start = original === null || original === void 0 ? void 0 : original.start;
+        var type = original === null || original === void 0 ? void 0 : original.type;
+        var write = original === null || original === void 0 ? void 0 : original.write;
+        return {
+            abort: abort === undefined ?
+                undefined :
+                convertUnderlyingSinkAbortCallback(abort, original, context + " has member 'abort' that"),
+            close: close === undefined ?
+                undefined :
+                convertUnderlyingSinkCloseCallback(close, original, context + " has member 'close' that"),
+            start: start === undefined ?
+                undefined :
+                convertUnderlyingSinkStartCallback(start, original, context + " has member 'start' that"),
+            write: write === undefined ?
+                undefined :
+                convertUnderlyingSinkWriteCallback(write, original, context + " has member 'write' that"),
+            type: type
+        };
+    }
+    function convertUnderlyingSinkAbortCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return function (reason) { return promiseCall(fn, original, [reason]); };
+    }
+    function convertUnderlyingSinkCloseCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return function () { return promiseCall(fn, original, []); };
+    }
+    function convertUnderlyingSinkStartCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return function (controller) { return reflectCall(fn, original, [controller]); };
+    }
+    function convertUnderlyingSinkWriteCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return function (chunk, controller) { return promiseCall(fn, original, [chunk, controller]); };
+    }
+
+    function assertWritableStream(x, context) {
+        if (!IsWritableStream(x)) {
+            throw new TypeError(context + " is not a WritableStream.");
+        }
+    }
+
+    function isAbortSignal(value) {
+        if (typeof value !== 'object' || value === null) {
+            return false;
+        }
+        try {
+            return typeof value.aborted === 'boolean';
+        }
+        catch (_a) {
+            // AbortSignal.prototype.aborted throws if its brand check fails
+            return false;
+        }
+    }
+    var supportsAbortController = typeof AbortController === 'function';
+    /**
+     * Construct a new AbortController, if supported by the platform.
+     *
+     * @internal
+     */
+    function createAbortController() {
+        if (supportsAbortController) {
+            return new AbortController();
+        }
+        return undefined;
+    }
+
+    /**
+     * A writable stream represents a destination for data, into which you can write.
+     *
+     * @public
+     */
+    var WritableStream = /** @class */ (function () {
+        function WritableStream(rawUnderlyingSink, rawStrategy) {
+            if (rawUnderlyingSink === void 0) { rawUnderlyingSink = {}; }
+            if (rawStrategy === void 0) { rawStrategy = {}; }
+            if (rawUnderlyingSink === undefined) {
+                rawUnderlyingSink = null;
+            }
+            else {
+                assertObject(rawUnderlyingSink, 'First parameter');
+            }
+            var strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');
+            var underlyingSink = convertUnderlyingSink(rawUnderlyingSink, 'First parameter');
+            InitializeWritableStream(this);
+            var type = underlyingSink.type;
+            if (type !== undefined) {
+                throw new RangeError('Invalid type is specified');
+            }
+            var sizeAlgorithm = ExtractSizeAlgorithm(strategy);
+            var highWaterMark = ExtractHighWaterMark(strategy, 1);
+            SetUpWritableStreamDefaultControllerFromUnderlyingSink(this, underlyingSink, highWaterMark, sizeAlgorithm);
+        }
+        Object.defineProperty(WritableStream.prototype, "locked", {
+            /**
+             * Returns whether or not the writable stream is locked to a writer.
+             */
+            get: function () {
+                if (!IsWritableStream(this)) {
+                    throw streamBrandCheckException$2('locked');
+                }
+                return IsWritableStreamLocked(this);
+            },
+            enumerable: false,
+            configurable: true
+        });
+        /**
+         * Aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be
+         * immediately moved to an errored state, with any queued-up writes discarded. This will also execute any abort
+         * mechanism of the underlying sink.
+         *
+         * The returned promise will fulfill if the stream shuts down successfully, or reject if the underlying sink signaled
+         * that there was an error doing so. Additionally, it will reject with a `TypeError` (without attempting to cancel
+         * the stream) if the stream is currently locked.
+         */
+        WritableStream.prototype.abort = function (reason) {
+            if (reason === void 0) { reason = undefined; }
+            if (!IsWritableStream(this)) {
+                return promiseRejectedWith(streamBrandCheckException$2('abort'));
+            }
+            if (IsWritableStreamLocked(this)) {
+                return promiseRejectedWith(new TypeError('Cannot abort a stream that already has a writer'));
+            }
+            return WritableStreamAbort(this, reason);
+        };
+        /**
+         * Closes the stream. The underlying sink will finish processing any previously-written chunks, before invoking its
+         * close behavior. During this time any further attempts to write will fail (without erroring the stream).
+         *
+         * The method returns a promise that will fulfill if all remaining chunks are successfully written and the stream
+         * successfully closes, or rejects if an error is encountered during this process. Additionally, it will reject with
+         * a `TypeError` (without attempting to cancel the stream) if the stream is currently locked.
+         */
+        WritableStream.prototype.close = function () {
+            if (!IsWritableStream(this)) {
+                return promiseRejectedWith(streamBrandCheckException$2('close'));
+            }
+            if (IsWritableStreamLocked(this)) {
+                return promiseRejectedWith(new TypeError('Cannot close a stream that already has a writer'));
+            }
+            if (WritableStreamCloseQueuedOrInFlight(this)) {
+                return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));
+            }
+            return WritableStreamClose(this);
+        };
+        /**
+         * Creates a {@link WritableStreamDefaultWriter | writer} and locks the stream to the new writer. While the stream
+         * is locked, no other writer can be acquired until this one is released.
+         *
+         * This functionality is especially useful for creating abstractions that desire the ability to write to a stream
+         * without interruption or interleaving. By getting a writer for the stream, you can ensure nobody else can write at
+         * the same time, which would cause the resulting written data to be unpredictable and probably useless.
+         */
+        WritableStream.prototype.getWriter = function () {
+            if (!IsWritableStream(this)) {
+                throw streamBrandCheckException$2('getWriter');
+            }
+            return AcquireWritableStreamDefaultWriter(this);
+        };
+        return WritableStream;
+    }());
+    Object.defineProperties(WritableStream.prototype, {
+        abort: { enumerable: true },
+        close: { enumerable: true },
+        getWriter: { enumerable: true },
+        locked: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(WritableStream.prototype, SymbolPolyfill.toStringTag, {
+            value: 'WritableStream',
+            configurable: true
+        });
+    }
+    // Abstract operations for the WritableStream.
+    function AcquireWritableStreamDefaultWriter(stream) {
+        return new WritableStreamDefaultWriter(stream);
+    }
+    // Throws if and only if startAlgorithm throws.
+    function CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm) {
+        if (highWaterMark === void 0) { highWaterMark = 1; }
+        if (sizeAlgorithm === void 0) { sizeAlgorithm = function () { return 1; }; }
+        var stream = Object.create(WritableStream.prototype);
+        InitializeWritableStream(stream);
+        var controller = Object.create(WritableStreamDefaultController.prototype);
+        SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm);
+        return stream;
+    }
+    function InitializeWritableStream(stream) {
+        stream._state = 'writable';
+        // The error that will be reported by new method calls once the state becomes errored. Only set when [[state]] is
+        // 'erroring' or 'errored'. May be set to an undefined value.
+        stream._storedError = undefined;
+        stream._writer = undefined;
+        // Initialize to undefined first because the constructor of the controller checks this
+        // variable to validate the caller.
+        stream._writableStreamController = undefined;
+        // This queue is placed here instead of the writer class in order to allow for passing a writer to the next data
+        // producer without waiting for the queued writes to finish.
+        stream._writeRequests = new SimpleQueue();
+        // Write requests are removed from _writeRequests when write() is called on the underlying sink. This prevents
+        // them from being erroneously rejected on error. If a write() call is in-flight, the request is stored here.
+        stream._inFlightWriteRequest = undefined;
+        // The promise that was returned from writer.close(). Stored here because it may be fulfilled after the writer
+        // has been detached.
+        stream._closeRequest = undefined;
+        // Close request is removed from _closeRequest when close() is called on the underlying sink. This prevents it
+        // from being erroneously rejected on error. If a close() call is in-flight, the request is stored here.
+        stream._inFlightCloseRequest = undefined;
+        // The promise that was returned from writer.abort(). This may also be fulfilled after the writer has detached.
+        stream._pendingAbortRequest = undefined;
+        // The backpressure signal set by the controller.
+        stream._backpressure = false;
+    }
+    function IsWritableStream(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_writableStreamController')) {
+            return false;
+        }
+        return x instanceof WritableStream;
+    }
+    function IsWritableStreamLocked(stream) {
+        if (stream._writer === undefined) {
+            return false;
+        }
+        return true;
+    }
+    function WritableStreamAbort(stream, reason) {
+        var _a;
+        if (stream._state === 'closed' || stream._state === 'errored') {
+            return promiseResolvedWith(undefined);
+        }
+        stream._writableStreamController._abortReason = reason;
+        (_a = stream._writableStreamController._abortController) === null || _a === void 0 ? void 0 : _a.abort();
+        // TypeScript narrows the type of `stream._state` down to 'writable' | 'erroring',
+        // but it doesn't know that signaling abort runs author code that might have changed the state.
+        // Widen the type again by casting to WritableStreamState.
+        var state = stream._state;
+        if (state === 'closed' || state === 'errored') {
+            return promiseResolvedWith(undefined);
+        }
+        if (stream._pendingAbortRequest !== undefined) {
+            return stream._pendingAbortRequest._promise;
+        }
+        var wasAlreadyErroring = false;
+        if (state === 'erroring') {
+            wasAlreadyErroring = true;
+            // reason will not be used, so don't keep a reference to it.
+            reason = undefined;
+        }
+        var promise = newPromise(function (resolve, reject) {
+            stream._pendingAbortRequest = {
+                _promise: undefined,
+                _resolve: resolve,
+                _reject: reject,
+                _reason: reason,
+                _wasAlreadyErroring: wasAlreadyErroring
+            };
+        });
+        stream._pendingAbortRequest._promise = promise;
+        if (!wasAlreadyErroring) {
+            WritableStreamStartErroring(stream, reason);
+        }
+        return promise;
+    }
+    function WritableStreamClose(stream) {
+        var state = stream._state;
+        if (state === 'closed' || state === 'errored') {
+            return promiseRejectedWith(new TypeError("The stream (in " + state + " state) is not in the writable state and cannot be closed"));
+        }
+        var promise = newPromise(function (resolve, reject) {
+            var closeRequest = {
+                _resolve: resolve,
+                _reject: reject
+            };
+            stream._closeRequest = closeRequest;
+        });
+        var writer = stream._writer;
+        if (writer !== undefined && stream._backpressure && state === 'writable') {
+            defaultWriterReadyPromiseResolve(writer);
+        }
+        WritableStreamDefaultControllerClose(stream._writableStreamController);
+        return promise;
+    }
+    // WritableStream API exposed for controllers.
+    function WritableStreamAddWriteRequest(stream) {
+        var promise = newPromise(function (resolve, reject) {
+            var writeRequest = {
+                _resolve: resolve,
+                _reject: reject
+            };
+            stream._writeRequests.push(writeRequest);
+        });
+        return promise;
+    }
+    function WritableStreamDealWithRejection(stream, error) {
+        var state = stream._state;
+        if (state === 'writable') {
+            WritableStreamStartErroring(stream, error);
+            return;
+        }
+        WritableStreamFinishErroring(stream);
+    }
+    function WritableStreamStartErroring(stream, reason) {
+        var controller = stream._writableStreamController;
+        stream._state = 'erroring';
+        stream._storedError = reason;
+        var writer = stream._writer;
+        if (writer !== undefined) {
+            WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);
+        }
+        if (!WritableStreamHasOperationMarkedInFlight(stream) && controller._started) {
+            WritableStreamFinishErroring(stream);
+        }
+    }
+    function WritableStreamFinishErroring(stream) {
+        stream._state = 'errored';
+        stream._writableStreamController[ErrorSteps]();
+        var storedError = stream._storedError;
+        stream._writeRequests.forEach(function (writeRequest) {
+            writeRequest._reject(storedError);
+        });
+        stream._writeRequests = new SimpleQueue();
+        if (stream._pendingAbortRequest === undefined) {
+            WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+            return;
+        }
+        var abortRequest = stream._pendingAbortRequest;
+        stream._pendingAbortRequest = undefined;
+        if (abortRequest._wasAlreadyErroring) {
+            abortRequest._reject(storedError);
+            WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+            return;
+        }
+        var promise = stream._writableStreamController[AbortSteps](abortRequest._reason);
+        uponPromise(promise, function () {
+            abortRequest._resolve();
+            WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+        }, function (reason) {
+            abortRequest._reject(reason);
+            WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+        });
+    }
+    function WritableStreamFinishInFlightWrite(stream) {
+        stream._inFlightWriteRequest._resolve(undefined);
+        stream._inFlightWriteRequest = undefined;
+    }
+    function WritableStreamFinishInFlightWriteWithError(stream, error) {
+        stream._inFlightWriteRequest._reject(error);
+        stream._inFlightWriteRequest = undefined;
+        WritableStreamDealWithRejection(stream, error);
+    }
+    function WritableStreamFinishInFlightClose(stream) {
+        stream._inFlightCloseRequest._resolve(undefined);
+        stream._inFlightCloseRequest = undefined;
+        var state = stream._state;
+        if (state === 'erroring') {
+            // The error was too late to do anything, so it is ignored.
+            stream._storedError = undefined;
+            if (stream._pendingAbortRequest !== undefined) {
+                stream._pendingAbortRequest._resolve();
+                stream._pendingAbortRequest = undefined;
+            }
+        }
+        stream._state = 'closed';
+        var writer = stream._writer;
+        if (writer !== undefined) {
+            defaultWriterClosedPromiseResolve(writer);
+        }
+    }
+    function WritableStreamFinishInFlightCloseWithError(stream, error) {
+        stream._inFlightCloseRequest._reject(error);
+        stream._inFlightCloseRequest = undefined;
+        // Never execute sink abort() after sink close().
+        if (stream._pendingAbortRequest !== undefined) {
+            stream._pendingAbortRequest._reject(error);
+            stream._pendingAbortRequest = undefined;
+        }
+        WritableStreamDealWithRejection(stream, error);
+    }
+    // TODO(ricea): Fix alphabetical order.
+    function WritableStreamCloseQueuedOrInFlight(stream) {
+        if (stream._closeRequest === undefined && stream._inFlightCloseRequest === undefined) {
+            return false;
+        }
+        return true;
+    }
+    function WritableStreamHasOperationMarkedInFlight(stream) {
+        if (stream._inFlightWriteRequest === undefined && stream._inFlightCloseRequest === undefined) {
+            return false;
+        }
+        return true;
+    }
+    function WritableStreamMarkCloseRequestInFlight(stream) {
+        stream._inFlightCloseRequest = stream._closeRequest;
+        stream._closeRequest = undefined;
+    }
+    function WritableStreamMarkFirstWriteRequestInFlight(stream) {
+        stream._inFlightWriteRequest = stream._writeRequests.shift();
+    }
+    function WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream) {
+        if (stream._closeRequest !== undefined) {
+            stream._closeRequest._reject(stream._storedError);
+            stream._closeRequest = undefined;
+        }
+        var writer = stream._writer;
+        if (writer !== undefined) {
+            defaultWriterClosedPromiseReject(writer, stream._storedError);
+        }
+    }
+    function WritableStreamUpdateBackpressure(stream, backpressure) {
+        var writer = stream._writer;
+        if (writer !== undefined && backpressure !== stream._backpressure) {
+            if (backpressure) {
+                defaultWriterReadyPromiseReset(writer);
+            }
+            else {
+                defaultWriterReadyPromiseResolve(writer);
+            }
+        }
+        stream._backpressure = backpressure;
+    }
+    /**
+     * A default writer vended by a {@link WritableStream}.
+     *
+     * @public
+     */
+    var WritableStreamDefaultWriter = /** @class */ (function () {
+        function WritableStreamDefaultWriter(stream) {
+            assertRequiredArgument(stream, 1, 'WritableStreamDefaultWriter');
+            assertWritableStream(stream, 'First parameter');
+            if (IsWritableStreamLocked(stream)) {
+                throw new TypeError('This stream has already been locked for exclusive writing by another writer');
+            }
+            this._ownerWritableStream = stream;
+            stream._writer = this;
+            var state = stream._state;
+            if (state === 'writable') {
+                if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._backpressure) {
+                    defaultWriterReadyPromiseInitialize(this);
+                }
+                else {
+                    defaultWriterReadyPromiseInitializeAsResolved(this);
+                }
+                defaultWriterClosedPromiseInitialize(this);
+            }
+            else if (state === 'erroring') {
+                defaultWriterReadyPromiseInitializeAsRejected(this, stream._storedError);
+                defaultWriterClosedPromiseInitialize(this);
+            }
+            else if (state === 'closed') {
+                defaultWriterReadyPromiseInitializeAsResolved(this);
+                defaultWriterClosedPromiseInitializeAsResolved(this);
+            }
+            else {
+                var storedError = stream._storedError;
+                defaultWriterReadyPromiseInitializeAsRejected(this, storedError);
+                defaultWriterClosedPromiseInitializeAsRejected(this, storedError);
+            }
+        }
+        Object.defineProperty(WritableStreamDefaultWriter.prototype, "closed", {
+            /**
+             * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or
+             * the writer’s lock is released before the stream finishes closing.
+             */
+            get: function () {
+                if (!IsWritableStreamDefaultWriter(this)) {
+                    return promiseRejectedWith(defaultWriterBrandCheckException('closed'));
+                }
+                return this._closedPromise;
+            },
+            enumerable: false,
+            configurable: true
+        });
+        Object.defineProperty(WritableStreamDefaultWriter.prototype, "desiredSize", {
+            /**
+             * Returns the desired size to fill the stream’s internal queue. It can be negative, if the queue is over-full.
+             * A producer can use this information to determine the right amount of data to write.
+             *
+             * It will be `null` if the stream cannot be successfully written to (due to either being errored, or having an abort
+             * queued up). It will return zero if the stream is closed. And the getter will throw an exception if invoked when
+             * the writer’s lock is released.
+             */
+            get: function () {
+                if (!IsWritableStreamDefaultWriter(this)) {
+                    throw defaultWriterBrandCheckException('desiredSize');
+                }
+                if (this._ownerWritableStream === undefined) {
+                    throw defaultWriterLockException('desiredSize');
+                }
+                return WritableStreamDefaultWriterGetDesiredSize(this);
+            },
+            enumerable: false,
+            configurable: true
+        });
+        Object.defineProperty(WritableStreamDefaultWriter.prototype, "ready", {
+            /**
+             * Returns a promise that will be fulfilled when the desired size to fill the stream’s internal queue transitions
+             * from non-positive to positive, signaling that it is no longer applying backpressure. Once the desired size dips
+             * back to zero or below, the getter will return a new promise that stays pending until the next transition.
+             *
+             * If the stream becomes errored or aborted, or the writer’s lock is released, the returned promise will become
+             * rejected.
+             */
+            get: function () {
+                if (!IsWritableStreamDefaultWriter(this)) {
+                    return promiseRejectedWith(defaultWriterBrandCheckException('ready'));
+                }
+                return this._readyPromise;
+            },
+            enumerable: false,
+            configurable: true
+        });
+        /**
+         * If the reader is active, behaves the same as {@link WritableStream.abort | stream.abort(reason)}.
+         */
+        WritableStreamDefaultWriter.prototype.abort = function (reason) {
+            if (reason === void 0) { reason = undefined; }
+            if (!IsWritableStreamDefaultWriter(this)) {
+                return promiseRejectedWith(defaultWriterBrandCheckException('abort'));
+            }
+            if (this._ownerWritableStream === undefined) {
+                return promiseRejectedWith(defaultWriterLockException('abort'));
+            }
+            return WritableStreamDefaultWriterAbort(this, reason);
+        };
+        /**
+         * If the reader is active, behaves the same as {@link WritableStream.close | stream.close()}.
+         */
+        WritableStreamDefaultWriter.prototype.close = function () {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                return promiseRejectedWith(defaultWriterBrandCheckException('close'));
+            }
+            var stream = this._ownerWritableStream;
+            if (stream === undefined) {
+                return promiseRejectedWith(defaultWriterLockException('close'));
+            }
+            if (WritableStreamCloseQueuedOrInFlight(stream)) {
+                return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));
+            }
+            return WritableStreamDefaultWriterClose(this);
+        };
+        /**
+         * Releases the writer’s lock on the corresponding stream. After the lock is released, the writer is no longer active.
+         * If the associated stream is errored when the lock is released, the writer will appear errored in the same way from
+         * now on; otherwise, the writer will appear closed.
+         *
+         * Note that the lock can still be released even if some ongoing writes have not yet finished (i.e. even if the
+         * promises returned from previous calls to {@link WritableStreamDefaultWriter.write | write()} have not yet settled).
+         * It’s not necessary to hold the lock on the writer for the duration of the write; the lock instead simply prevents
+         * other producers from writing in an interleaved manner.
+         */
+        WritableStreamDefaultWriter.prototype.releaseLock = function () {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                throw defaultWriterBrandCheckException('releaseLock');
+            }
+            var stream = this._ownerWritableStream;
+            if (stream === undefined) {
+                return;
+            }
+            WritableStreamDefaultWriterRelease(this);
+        };
+        WritableStreamDefaultWriter.prototype.write = function (chunk) {
+            if (chunk === void 0) { chunk = undefined; }
+            if (!IsWritableStreamDefaultWriter(this)) {
+                return promiseRejectedWith(defaultWriterBrandCheckException('write'));
+            }
+            if (this._ownerWritableStream === undefined) {
+                return promiseRejectedWith(defaultWriterLockException('write to'));
+            }
+            return WritableStreamDefaultWriterWrite(this, chunk);
+        };
+        return WritableStreamDefaultWriter;
+    }());
+    Object.defineProperties(WritableStreamDefaultWriter.prototype, {
+        abort: { enumerable: true },
+        close: { enumerable: true },
+        releaseLock: { enumerable: true },
+        write: { enumerable: true },
+        closed: { enumerable: true },
+        desiredSize: { enumerable: true },
+        ready: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(WritableStreamDefaultWriter.prototype, SymbolPolyfill.toStringTag, {
+            value: 'WritableStreamDefaultWriter',
+            configurable: true
+        });
+    }
+    // Abstract operations for the WritableStreamDefaultWriter.
+    function IsWritableStreamDefaultWriter(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) {
+            return false;
+        }
+        return x instanceof WritableStreamDefaultWriter;
+    }
+    // A client of WritableStreamDefaultWriter may use these functions directly to bypass state check.
+    function WritableStreamDefaultWriterAbort(writer, reason) {
+        var stream = writer._ownerWritableStream;
+        return WritableStreamAbort(stream, reason);
+    }
+    function WritableStreamDefaultWriterClose(writer) {
+        var stream = writer._ownerWritableStream;
+        return WritableStreamClose(stream);
+    }
+    function WritableStreamDefaultWriterCloseWithErrorPropagation(writer) {
+        var stream = writer._ownerWritableStream;
+        var state = stream._state;
+        if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {
+            return promiseResolvedWith(undefined);
+        }
+        if (state === 'errored') {
+            return promiseRejectedWith(stream._storedError);
+        }
+        return WritableStreamDefaultWriterClose(writer);
+    }
+    function WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, error) {
+        if (writer._closedPromiseState === 'pending') {
+            defaultWriterClosedPromiseReject(writer, error);
+        }
+        else {
+            defaultWriterClosedPromiseResetToRejected(writer, error);
+        }
+    }
+    function WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, error) {
+        if (writer._readyPromiseState === 'pending') {
+            defaultWriterReadyPromiseReject(writer, error);
+        }
+        else {
+            defaultWriterReadyPromiseResetToRejected(writer, error);
+        }
+    }
+    function WritableStreamDefaultWriterGetDesiredSize(writer) {
+        var stream = writer._ownerWritableStream;
+        var state = stream._state;
+        if (state === 'errored' || state === 'erroring') {
+            return null;
+        }
+        if (state === 'closed') {
+            return 0;
+        }
+        return WritableStreamDefaultControllerGetDesiredSize(stream._writableStreamController);
+    }
+    function WritableStreamDefaultWriterRelease(writer) {
+        var stream = writer._ownerWritableStream;
+        var releasedError = new TypeError("Writer was released and can no longer be used to monitor the stream's closedness");
+        WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, releasedError);
+        // The state transitions to "errored" before the sink abort() method runs, but the writer.closed promise is not
+        // rejected until afterwards. This means that simply testing state will not work.
+        WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, releasedError);
+        stream._writer = undefined;
+        writer._ownerWritableStream = undefined;
+    }
+    function WritableStreamDefaultWriterWrite(writer, chunk) {
+        var stream = writer._ownerWritableStream;
+        var controller = stream._writableStreamController;
+        var chunkSize = WritableStreamDefaultControllerGetChunkSize(controller, chunk);
+        if (stream !== writer._ownerWritableStream) {
+            return promiseRejectedWith(defaultWriterLockException('write to'));
+        }
+        var state = stream._state;
+        if (state === 'errored') {
+            return promiseRejectedWith(stream._storedError);
+        }
+        if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {
+            return promiseRejectedWith(new TypeError('The stream is closing or closed and cannot be written to'));
+        }
+        if (state === 'erroring') {
+            return promiseRejectedWith(stream._storedError);
+        }
+        var promise = WritableStreamAddWriteRequest(stream);
+        WritableStreamDefaultControllerWrite(controller, chunk, chunkSize);
+        return promise;
+    }
+    var closeSentinel = {};
+    /**
+     * Allows control of a {@link WritableStream | writable stream}'s state and internal queue.
+     *
+     * @public
+     */
+    var WritableStreamDefaultController = /** @class */ (function () {
+        function WritableStreamDefaultController() {
+            throw new TypeError('Illegal constructor');
+        }
+        Object.defineProperty(WritableStreamDefaultController.prototype, "abortReason", {
+            /**
+             * The reason which was passed to `WritableStream.abort(reason)` when the stream was aborted.
+             *
+             * @deprecated
+             *  This property has been removed from the specification, see https://github.com/whatwg/streams/pull/1177.
+             *  Use {@link WritableStreamDefaultController.signal}'s `reason` instead.
+             */
+            get: function () {
+                if (!IsWritableStreamDefaultController(this)) {
+                    throw defaultControllerBrandCheckException$2('abortReason');
+                }
+                return this._abortReason;
+            },
+            enumerable: false,
+            configurable: true
+        });
+        Object.defineProperty(WritableStreamDefaultController.prototype, "signal", {
+            /**
+             * An `AbortSignal` that can be used to abort the pending write or close operation when the stream is aborted.
+             */
+            get: function () {
+                if (!IsWritableStreamDefaultController(this)) {
+                    throw defaultControllerBrandCheckException$2('signal');
+                }
+                if (this._abortController === undefined) {
+                    // Older browsers or older Node versions may not support `AbortController` or `AbortSignal`.
+                    // We don't want to bundle and ship an `AbortController` polyfill together with our polyfill,
+                    // so instead we only implement support for `signal` if we find a global `AbortController` constructor.
+                    throw new TypeError('WritableStreamDefaultController.prototype.signal is not supported');
+                }
+                return this._abortController.signal;
+            },
+            enumerable: false,
+            configurable: true
+        });
+        /**
+         * Closes the controlled writable stream, making all future interactions with it fail with the given error `e`.
+         *
+         * This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying
+         * sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the
+         * normal lifecycle of interactions with the underlying sink.
+         */
+        WritableStreamDefaultController.prototype.error = function (e) {
+            if (e === void 0) { e = undefined; }
+            if (!IsWritableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$2('error');
+            }
+            var state = this._controlledWritableStream._state;
+            if (state !== 'writable') {
+                // The stream is closed, errored or will be soon. The sink can't do anything useful if it gets an error here, so
+                // just treat it as a no-op.
+                return;
+            }
+            WritableStreamDefaultControllerError(this, e);
+        };
+        /** @internal */
+        WritableStreamDefaultController.prototype[AbortSteps] = function (reason) {
+            var result = this._abortAlgorithm(reason);
+            WritableStreamDefaultControllerClearAlgorithms(this);
+            return result;
+        };
+        /** @internal */
+        WritableStreamDefaultController.prototype[ErrorSteps] = function () {
+            ResetQueue(this);
+        };
+        return WritableStreamDefaultController;
+    }());
+    Object.defineProperties(WritableStreamDefaultController.prototype, {
+        abortReason: { enumerable: true },
+        signal: { enumerable: true },
+        error: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(WritableStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+            value: 'WritableStreamDefaultController',
+            configurable: true
+        });
+    }
+    // Abstract operations implementing interface required by the WritableStream.
+    function IsWritableStreamDefaultController(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_controlledWritableStream')) {
+            return false;
+        }
+        return x instanceof WritableStreamDefaultController;
+    }
+    function SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm) {
+        controller._controlledWritableStream = stream;
+        stream._writableStreamController = controller;
+        // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.
+        controller._queue = undefined;
+        controller._queueTotalSize = undefined;
+        ResetQueue(controller);
+        controller._abortReason = undefined;
+        controller._abortController = createAbortController();
+        controller._started = false;
+        controller._strategySizeAlgorithm = sizeAlgorithm;
+        controller._strategyHWM = highWaterMark;
+        controller._writeAlgorithm = writeAlgorithm;
+        controller._closeAlgorithm = closeAlgorithm;
+        controller._abortAlgorithm = abortAlgorithm;
+        var backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+        WritableStreamUpdateBackpressure(stream, backpressure);
+        var startResult = startAlgorithm();
+        var startPromise = promiseResolvedWith(startResult);
+        uponPromise(startPromise, function () {
+            controller._started = true;
+            WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+        }, function (r) {
+            controller._started = true;
+            WritableStreamDealWithRejection(stream, r);
+        });
+    }
+    function SetUpWritableStreamDefaultControllerFromUnderlyingSink(stream, underlyingSink, highWaterMark, sizeAlgorithm) {
+        var controller = Object.create(WritableStreamDefaultController.prototype);
+        var startAlgorithm = function () { return undefined; };
+        var writeAlgorithm = function () { return promiseResolvedWith(undefined); };
+        var closeAlgorithm = function () { return promiseResolvedWith(undefined); };
+        var abortAlgorithm = function () { return promiseResolvedWith(undefined); };
+        if (underlyingSink.start !== undefined) {
+            startAlgorithm = function () { return underlyingSink.start(controller); };
+        }
+        if (underlyingSink.write !== undefined) {
+            writeAlgorithm = function (chunk) { return underlyingSink.write(chunk, controller); };
+        }
+        if (underlyingSink.close !== undefined) {
+            closeAlgorithm = function () { return underlyingSink.close(); };
+        }
+        if (underlyingSink.abort !== undefined) {
+            abortAlgorithm = function (reason) { return underlyingSink.abort(reason); };
+        }
+        SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm);
+    }
+    // ClearAlgorithms may be called twice. Erroring the same stream in multiple ways will often result in redundant calls.
+    function WritableStreamDefaultControllerClearAlgorithms(controller) {
+        controller._writeAlgorithm = undefined;
+        controller._closeAlgorithm = undefined;
+        controller._abortAlgorithm = undefined;
+        controller._strategySizeAlgorithm = undefined;
+    }
+    function WritableStreamDefaultControllerClose(controller) {
+        EnqueueValueWithSize(controller, closeSentinel, 0);
+        WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+    }
+    function WritableStreamDefaultControllerGetChunkSize(controller, chunk) {
+        try {
+            return controller._strategySizeAlgorithm(chunk);
+        }
+        catch (chunkSizeE) {
+            WritableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE);
+            return 1;
+        }
+    }
+    function WritableStreamDefaultControllerGetDesiredSize(controller) {
+        return controller._strategyHWM - controller._queueTotalSize;
+    }
+    function WritableStreamDefaultControllerWrite(controller, chunk, chunkSize) {
+        try {
+            EnqueueValueWithSize(controller, chunk, chunkSize);
+        }
+        catch (enqueueE) {
+            WritableStreamDefaultControllerErrorIfNeeded(controller, enqueueE);
+            return;
+        }
+        var stream = controller._controlledWritableStream;
+        if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._state === 'writable') {
+            var backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+            WritableStreamUpdateBackpressure(stream, backpressure);
+        }
+        WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+    }
+    // Abstract operations for the WritableStreamDefaultController.
+    function WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller) {
+        var stream = controller._controlledWritableStream;
+        if (!controller._started) {
+            return;
+        }
+        if (stream._inFlightWriteRequest !== undefined) {
+            return;
+        }
+        var state = stream._state;
+        if (state === 'erroring') {
+            WritableStreamFinishErroring(stream);
+            return;
+        }
+        if (controller._queue.length === 0) {
+            return;
+        }
+        var value = PeekQueueValue(controller);
+        if (value === closeSentinel) {
+            WritableStreamDefaultControllerProcessClose(controller);
+        }
+        else {
+            WritableStreamDefaultControllerProcessWrite(controller, value);
+        }
+    }
+    function WritableStreamDefaultControllerErrorIfNeeded(controller, error) {
+        if (controller._controlledWritableStream._state === 'writable') {
+            WritableStreamDefaultControllerError(controller, error);
+        }
+    }
+    function WritableStreamDefaultControllerProcessClose(controller) {
+        var stream = controller._controlledWritableStream;
+        WritableStreamMarkCloseRequestInFlight(stream);
+        DequeueValue(controller);
+        var sinkClosePromise = controller._closeAlgorithm();
+        WritableStreamDefaultControllerClearAlgorithms(controller);
+        uponPromise(sinkClosePromise, function () {
+            WritableStreamFinishInFlightClose(stream);
+        }, function (reason) {
+            WritableStreamFinishInFlightCloseWithError(stream, reason);
+        });
+    }
+    function WritableStreamDefaultControllerProcessWrite(controller, chunk) {
+        var stream = controller._controlledWritableStream;
+        WritableStreamMarkFirstWriteRequestInFlight(stream);
+        var sinkWritePromise = controller._writeAlgorithm(chunk);
+        uponPromise(sinkWritePromise, function () {
+            WritableStreamFinishInFlightWrite(stream);
+            var state = stream._state;
+            DequeueValue(controller);
+            if (!WritableStreamCloseQueuedOrInFlight(stream) && state === 'writable') {
+                var backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+                WritableStreamUpdateBackpressure(stream, backpressure);
+            }
+            WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+        }, function (reason) {
+            if (stream._state === 'writable') {
+                WritableStreamDefaultControllerClearAlgorithms(controller);
+            }
+            WritableStreamFinishInFlightWriteWithError(stream, reason);
+        });
+    }
+    function WritableStreamDefaultControllerGetBackpressure(controller) {
+        var desiredSize = WritableStreamDefaultControllerGetDesiredSize(controller);
+        return desiredSize <= 0;
+    }
+    // A client of WritableStreamDefaultController may use these functions directly to bypass state check.
+    function WritableStreamDefaultControllerError(controller, error) {
+        var stream = controller._controlledWritableStream;
+        WritableStreamDefaultControllerClearAlgorithms(controller);
+        WritableStreamStartErroring(stream, error);
+    }
+    // Helper functions for the WritableStream.
+    function streamBrandCheckException$2(name) {
+        return new TypeError("WritableStream.prototype." + name + " can only be used on a WritableStream");
+    }
+    // Helper functions for the WritableStreamDefaultController.
+    function defaultControllerBrandCheckException$2(name) {
+        return new TypeError("WritableStreamDefaultController.prototype." + name + " can only be used on a WritableStreamDefaultController");
+    }
+    // Helper functions for the WritableStreamDefaultWriter.
+    function defaultWriterBrandCheckException(name) {
+        return new TypeError("WritableStreamDefaultWriter.prototype." + name + " can only be used on a WritableStreamDefaultWriter");
+    }
+    function defaultWriterLockException(name) {
+        return new TypeError('Cannot ' + name + ' a stream using a released writer');
+    }
+    function defaultWriterClosedPromiseInitialize(writer) {
+        writer._closedPromise = newPromise(function (resolve, reject) {
+            writer._closedPromise_resolve = resolve;
+            writer._closedPromise_reject = reject;
+            writer._closedPromiseState = 'pending';
+        });
+    }
+    function defaultWriterClosedPromiseInitializeAsRejected(writer, reason) {
+        defaultWriterClosedPromiseInitialize(writer);
+        defaultWriterClosedPromiseReject(writer, reason);
+    }
+    function defaultWriterClosedPromiseInitializeAsResolved(writer) {
+        defaultWriterClosedPromiseInitialize(writer);
+        defaultWriterClosedPromiseResolve(writer);
+    }
+    function defaultWriterClosedPromiseReject(writer, reason) {
+        if (writer._closedPromise_reject === undefined) {
+            return;
+        }
+        setPromiseIsHandledToTrue(writer._closedPromise);
+        writer._closedPromise_reject(reason);
+        writer._closedPromise_resolve = undefined;
+        writer._closedPromise_reject = undefined;
+        writer._closedPromiseState = 'rejected';
+    }
+    function defaultWriterClosedPromiseResetToRejected(writer, reason) {
+        defaultWriterClosedPromiseInitializeAsRejected(writer, reason);
+    }
+    function defaultWriterClosedPromiseResolve(writer) {
+        if (writer._closedPromise_resolve === undefined) {
+            return;
+        }
+        writer._closedPromise_resolve(undefined);
+        writer._closedPromise_resolve = undefined;
+        writer._closedPromise_reject = undefined;
+        writer._closedPromiseState = 'resolved';
+    }
+    function defaultWriterReadyPromiseInitialize(writer) {
+        writer._readyPromise = newPromise(function (resolve, reject) {
+            writer._readyPromise_resolve = resolve;
+            writer._readyPromise_reject = reject;
+        });
+        writer._readyPromiseState = 'pending';
+    }
+    function defaultWriterReadyPromiseInitializeAsRejected(writer, reason) {
+        defaultWriterReadyPromiseInitialize(writer);
+        defaultWriterReadyPromiseReject(writer, reason);
+    }
+    function defaultWriterReadyPromiseInitializeAsResolved(writer) {
+        defaultWriterReadyPromiseInitialize(writer);
+        defaultWriterReadyPromiseResolve(writer);
+    }
+    function defaultWriterReadyPromiseReject(writer, reason) {
+        if (writer._readyPromise_reject === undefined) {
+            return;
+        }
+        setPromiseIsHandledToTrue(writer._readyPromise);
+        writer._readyPromise_reject(reason);
+        writer._readyPromise_resolve = undefined;
+        writer._readyPromise_reject = undefined;
+        writer._readyPromiseState = 'rejected';
+    }
+    function defaultWriterReadyPromiseReset(writer) {
+        defaultWriterReadyPromiseInitialize(writer);
+    }
+    function defaultWriterReadyPromiseResetToRejected(writer, reason) {
+        defaultWriterReadyPromiseInitializeAsRejected(writer, reason);
+    }
+    function defaultWriterReadyPromiseResolve(writer) {
+        if (writer._readyPromise_resolve === undefined) {
+            return;
+        }
+        writer._readyPromise_resolve(undefined);
+        writer._readyPromise_resolve = undefined;
+        writer._readyPromise_reject = undefined;
+        writer._readyPromiseState = 'fulfilled';
+    }
+
+    /// <reference lib="dom" />
+    var NativeDOMException = typeof DOMException !== 'undefined' ? DOMException : undefined;
+
+    /// <reference types="node" />
+    function isDOMExceptionConstructor(ctor) {
+        if (!(typeof ctor === 'function' || typeof ctor === 'object')) {
+            return false;
+        }
+        try {
+            new ctor();
+            return true;
+        }
+        catch (_a) {
+            return false;
+        }
+    }
+    function createDOMExceptionPolyfill() {
+        // eslint-disable-next-line no-shadow
+        var ctor = function DOMException(message, name) {
+            this.message = message || '';
+            this.name = name || 'Error';
+            if (Error.captureStackTrace) {
+                Error.captureStackTrace(this, this.constructor);
+            }
+        };
+        ctor.prototype = Object.create(Error.prototype);
+        Object.defineProperty(ctor.prototype, 'constructor', { value: ctor, writable: true, configurable: true });
+        return ctor;
+    }
+    // eslint-disable-next-line no-redeclare
+    var DOMException$1 = isDOMExceptionConstructor(NativeDOMException) ? NativeDOMException : createDOMExceptionPolyfill();
+
+    function ReadableStreamPipeTo(source, dest, preventClose, preventAbort, preventCancel, signal) {
+        var reader = AcquireReadableStreamDefaultReader(source);
+        var writer = AcquireWritableStreamDefaultWriter(dest);
+        source._disturbed = true;
+        var shuttingDown = false;
+        // This is used to keep track of the spec's requirement that we wait for ongoing writes during shutdown.
+        var currentWrite = promiseResolvedWith(undefined);
+        return newPromise(function (resolve, reject) {
+            var abortAlgorithm;
+            if (signal !== undefined) {
+                abortAlgorithm = function () {
+                    var error = new DOMException$1('Aborted', 'AbortError');
+                    var actions = [];
+                    if (!preventAbort) {
+                        actions.push(function () {
+                            if (dest._state === 'writable') {
+                                return WritableStreamAbort(dest, error);
+                            }
+                            return promiseResolvedWith(undefined);
+                        });
+                    }
+                    if (!preventCancel) {
+                        actions.push(function () {
+                            if (source._state === 'readable') {
+                                return ReadableStreamCancel(source, error);
+                            }
+                            return promiseResolvedWith(undefined);
+                        });
+                    }
+                    shutdownWithAction(function () { return Promise.all(actions.map(function (action) { return action(); })); }, true, error);
+                };
+                if (signal.aborted) {
+                    abortAlgorithm();
+                    return;
+                }
+                signal.addEventListener('abort', abortAlgorithm);
+            }
+            // Using reader and writer, read all chunks from this and write them to dest
+            // - Backpressure must be enforced
+            // - Shutdown must stop all activity
+            function pipeLoop() {
+                return newPromise(function (resolveLoop, rejectLoop) {
+                    function next(done) {
+                        if (done) {
+                            resolveLoop();
+                        }
+                        else {
+                            // Use `PerformPromiseThen` instead of `uponPromise` to avoid
+                            // adding unnecessary `.catch(rethrowAssertionErrorRejection)` handlers
+                            PerformPromiseThen(pipeStep(), next, rejectLoop);
+                        }
+                    }
+                    next(false);
+                });
+            }
+            function pipeStep() {
+                if (shuttingDown) {
+                    return promiseResolvedWith(true);
+                }
+                return PerformPromiseThen(writer._readyPromise, function () {
+                    return newPromise(function (resolveRead, rejectRead) {
+                        ReadableStreamDefaultReaderRead(reader, {
+                            _chunkSteps: function (chunk) {
+                                currentWrite = PerformPromiseThen(WritableStreamDefaultWriterWrite(writer, chunk), undefined, noop);
+                                resolveRead(false);
+                            },
+                            _closeSteps: function () { return resolveRead(true); },
+                            _errorSteps: rejectRead
+                        });
+                    });
+                });
+            }
+            // Errors must be propagated forward
+            isOrBecomesErrored(source, reader._closedPromise, function (storedError) {
+                if (!preventAbort) {
+                    shutdownWithAction(function () { return WritableStreamAbort(dest, storedError); }, true, storedError);
+                }
+                else {
+                    shutdown(true, storedError);
+                }
+            });
+            // Errors must be propagated backward
+            isOrBecomesErrored(dest, writer._closedPromise, function (storedError) {
+                if (!preventCancel) {
+                    shutdownWithAction(function () { return ReadableStreamCancel(source, storedError); }, true, storedError);
+                }
+                else {
+                    shutdown(true, storedError);
+                }
+            });
+            // Closing must be propagated forward
+            isOrBecomesClosed(source, reader._closedPromise, function () {
+                if (!preventClose) {
+                    shutdownWithAction(function () { return WritableStreamDefaultWriterCloseWithErrorPropagation(writer); });
+                }
+                else {
+                    shutdown();
+                }
+            });
+            // Closing must be propagated backward
+            if (WritableStreamCloseQueuedOrInFlight(dest) || dest._state === 'closed') {
+                var destClosed_1 = new TypeError('the destination writable stream closed before all data could be piped to it');
+                if (!preventCancel) {
+                    shutdownWithAction(function () { return ReadableStreamCancel(source, destClosed_1); }, true, destClosed_1);
+                }
+                else {
+                    shutdown(true, destClosed_1);
+                }
+            }
+            setPromiseIsHandledToTrue(pipeLoop());
+            function waitForWritesToFinish() {
+                // Another write may have started while we were waiting on this currentWrite, so we have to be sure to wait
+                // for that too.
+                var oldCurrentWrite = currentWrite;
+                return PerformPromiseThen(currentWrite, function () { return oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined; });
+            }
+            function isOrBecomesErrored(stream, promise, action) {
+                if (stream._state === 'errored') {
+                    action(stream._storedError);
+                }
+                else {
+                    uponRejection(promise, action);
+                }
+            }
+            function isOrBecomesClosed(stream, promise, action) {
+                if (stream._state === 'closed') {
+                    action();
+                }
+                else {
+                    uponFulfillment(promise, action);
+                }
+            }
+            function shutdownWithAction(action, originalIsError, originalError) {
+                if (shuttingDown) {
+                    return;
+                }
+                shuttingDown = true;
+                if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {
+                    uponFulfillment(waitForWritesToFinish(), doTheRest);
+                }
+                else {
+                    doTheRest();
+                }
+                function doTheRest() {
+                    uponPromise(action(), function () { return finalize(originalIsError, originalError); }, function (newError) { return finalize(true, newError); });
+                }
+            }
+            function shutdown(isError, error) {
+                if (shuttingDown) {
+                    return;
+                }
+                shuttingDown = true;
+                if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {
+                    uponFulfillment(waitForWritesToFinish(), function () { return finalize(isError, error); });
+                }
+                else {
+                    finalize(isError, error);
+                }
+            }
+            function finalize(isError, error) {
+                WritableStreamDefaultWriterRelease(writer);
+                ReadableStreamReaderGenericRelease(reader);
+                if (signal !== undefined) {
+                    signal.removeEventListener('abort', abortAlgorithm);
+                }
+                if (isError) {
+                    reject(error);
+                }
+                else {
+                    resolve(undefined);
+                }
+            }
+        });
+    }
+
+    /**
+     * Allows control of a {@link ReadableStream | readable stream}'s state and internal queue.
+     *
+     * @public
+     */
+    var ReadableStreamDefaultController = /** @class */ (function () {
+        function ReadableStreamDefaultController() {
+            throw new TypeError('Illegal constructor');
+        }
+        Object.defineProperty(ReadableStreamDefaultController.prototype, "desiredSize", {
+            /**
+             * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is
+             * over-full. An underlying source ought to use this information to determine when and how to apply backpressure.
+             */
+            get: function () {
+                if (!IsReadableStreamDefaultController(this)) {
+                    throw defaultControllerBrandCheckException$1('desiredSize');
+                }
+                return ReadableStreamDefaultControllerGetDesiredSize(this);
+            },
+            enumerable: false,
+            configurable: true
+        });
+        /**
+         * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from
+         * the stream, but once those are read, the stream will become closed.
+         */
+        ReadableStreamDefaultController.prototype.close = function () {
+            if (!IsReadableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$1('close');
+            }
+            if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {
+                throw new TypeError('The stream is not in a state that permits close');
+            }
+            ReadableStreamDefaultControllerClose(this);
+        };
+        ReadableStreamDefaultController.prototype.enqueue = function (chunk) {
+            if (chunk === void 0) { chunk = undefined; }
+            if (!IsReadableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$1('enqueue');
+            }
+            if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {
+                throw new TypeError('The stream is not in a state that permits enqueue');
+            }
+            return ReadableStreamDefaultControllerEnqueue(this, chunk);
+        };
+        /**
+         * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.
+         */
+        ReadableStreamDefaultController.prototype.error = function (e) {
+            if (e === void 0) { e = undefined; }
+            if (!IsReadableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$1('error');
+            }
+            ReadableStreamDefaultControllerError(this, e);
+        };
+        /** @internal */
+        ReadableStreamDefaultController.prototype[CancelSteps] = function (reason) {
+            ResetQueue(this);
+            var result = this._cancelAlgorithm(reason);
+            ReadableStreamDefaultControllerClearAlgorithms(this);
+            return result;
+        };
+        /** @internal */
+        ReadableStreamDefaultController.prototype[PullSteps] = function (readRequest) {
+            var stream = this._controlledReadableStream;
+            if (this._queue.length > 0) {
+                var chunk = DequeueValue(this);
+                if (this._closeRequested && this._queue.length === 0) {
+                    ReadableStreamDefaultControllerClearAlgorithms(this);
+                    ReadableStreamClose(stream);
+                }
+                else {
+                    ReadableStreamDefaultControllerCallPullIfNeeded(this);
+                }
+                readRequest._chunkSteps(chunk);
+            }
+            else {
+                ReadableStreamAddReadRequest(stream, readRequest);
+                ReadableStreamDefaultControllerCallPullIfNeeded(this);
+            }
+        };
+        return ReadableStreamDefaultController;
+    }());
+    Object.defineProperties(ReadableStreamDefaultController.prototype, {
+        close: { enumerable: true },
+        enqueue: { enumerable: true },
+        error: { enumerable: true },
+        desiredSize: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableStreamDefaultController',
+            configurable: true
+        });
+    }
+    // Abstract operations for the ReadableStreamDefaultController.
+    function IsReadableStreamDefaultController(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableStream')) {
+            return false;
+        }
+        return x instanceof ReadableStreamDefaultController;
+    }
+    function ReadableStreamDefaultControllerCallPullIfNeeded(controller) {
+        var shouldPull = ReadableStreamDefaultControllerShouldCallPull(controller);
+        if (!shouldPull) {
+            return;
+        }
+        if (controller._pulling) {
+            controller._pullAgain = true;
+            return;
+        }
+        controller._pulling = true;
+        var pullPromise = controller._pullAlgorithm();
+        uponPromise(pullPromise, function () {
+            controller._pulling = false;
+            if (controller._pullAgain) {
+                controller._pullAgain = false;
+                ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+            }
+        }, function (e) {
+            ReadableStreamDefaultControllerError(controller, e);
+        });
+    }
+    function ReadableStreamDefaultControllerShouldCallPull(controller) {
+        var stream = controller._controlledReadableStream;
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+            return false;
+        }
+        if (!controller._started) {
+            return false;
+        }
+        if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+            return true;
+        }
+        var desiredSize = ReadableStreamDefaultControllerGetDesiredSize(controller);
+        if (desiredSize > 0) {
+            return true;
+        }
+        return false;
+    }
+    function ReadableStreamDefaultControllerClearAlgorithms(controller) {
+        controller._pullAlgorithm = undefined;
+        controller._cancelAlgorithm = undefined;
+        controller._strategySizeAlgorithm = undefined;
+    }
+    // A client of ReadableStreamDefaultController may use these functions directly to bypass state check.
+    function ReadableStreamDefaultControllerClose(controller) {
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+            return;
+        }
+        var stream = controller._controlledReadableStream;
+        controller._closeRequested = true;
+        if (controller._queue.length === 0) {
+            ReadableStreamDefaultControllerClearAlgorithms(controller);
+            ReadableStreamClose(stream);
+        }
+    }
+    function ReadableStreamDefaultControllerEnqueue(controller, chunk) {
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+            return;
+        }
+        var stream = controller._controlledReadableStream;
+        if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+            ReadableStreamFulfillReadRequest(stream, chunk, false);
+        }
+        else {
+            var chunkSize = void 0;
+            try {
+                chunkSize = controller._strategySizeAlgorithm(chunk);
+            }
+            catch (chunkSizeE) {
+                ReadableStreamDefaultControllerError(controller, chunkSizeE);
+                throw chunkSizeE;
+            }
+            try {
+                EnqueueValueWithSize(controller, chunk, chunkSize);
+            }
+            catch (enqueueE) {
+                ReadableStreamDefaultControllerError(controller, enqueueE);
+                throw enqueueE;
+            }
+        }
+        ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+    }
+    function ReadableStreamDefaultControllerError(controller, e) {
+        var stream = controller._controlledReadableStream;
+        if (stream._state !== 'readable') {
+            return;
+        }
+        ResetQueue(controller);
+        ReadableStreamDefaultControllerClearAlgorithms(controller);
+        ReadableStreamError(stream, e);
+    }
+    function ReadableStreamDefaultControllerGetDesiredSize(controller) {
+        var state = controller._controlledReadableStream._state;
+        if (state === 'errored') {
+            return null;
+        }
+        if (state === 'closed') {
+            return 0;
+        }
+        return controller._strategyHWM - controller._queueTotalSize;
+    }
+    // This is used in the implementation of TransformStream.
+    function ReadableStreamDefaultControllerHasBackpressure(controller) {
+        if (ReadableStreamDefaultControllerShouldCallPull(controller)) {
+            return false;
+        }
+        return true;
+    }
+    function ReadableStreamDefaultControllerCanCloseOrEnqueue(controller) {
+        var state = controller._controlledReadableStream._state;
+        if (!controller._closeRequested && state === 'readable') {
+            return true;
+        }
+        return false;
+    }
+    function SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm) {
+        controller._controlledReadableStream = stream;
+        controller._queue = undefined;
+        controller._queueTotalSize = undefined;
+        ResetQueue(controller);
+        controller._started = false;
+        controller._closeRequested = false;
+        controller._pullAgain = false;
+        controller._pulling = false;
+        controller._strategySizeAlgorithm = sizeAlgorithm;
+        controller._strategyHWM = highWaterMark;
+        controller._pullAlgorithm = pullAlgorithm;
+        controller._cancelAlgorithm = cancelAlgorithm;
+        stream._readableStreamController = controller;
+        var startResult = startAlgorithm();
+        uponPromise(promiseResolvedWith(startResult), function () {
+            controller._started = true;
+            ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+        }, function (r) {
+            ReadableStreamDefaultControllerError(controller, r);
+        });
+    }
+    function SetUpReadableStreamDefaultControllerFromUnderlyingSource(stream, underlyingSource, highWaterMark, sizeAlgorithm) {
+        var controller = Object.create(ReadableStreamDefaultController.prototype);
+        var startAlgorithm = function () { return undefined; };
+        var pullAlgorithm = function () { return promiseResolvedWith(undefined); };
+        var cancelAlgorithm = function () { return promiseResolvedWith(undefined); };
+        if (underlyingSource.start !== undefined) {
+            startAlgorithm = function () { return underlyingSource.start(controller); };
+        }
+        if (underlyingSource.pull !== undefined) {
+            pullAlgorithm = function () { return underlyingSource.pull(controller); };
+        }
+        if (underlyingSource.cancel !== undefined) {
+            cancelAlgorithm = function (reason) { return underlyingSource.cancel(reason); };
+        }
+        SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm);
+    }
+    // Helper functions for the ReadableStreamDefaultController.
+    function defaultControllerBrandCheckException$1(name) {
+        return new TypeError("ReadableStreamDefaultController.prototype." + name + " can only be used on a ReadableStreamDefaultController");
+    }
+
+    function ReadableStreamTee(stream, cloneForBranch2) {
+        if (IsReadableByteStreamController(stream._readableStreamController)) {
+            return ReadableByteStreamTee(stream);
+        }
+        return ReadableStreamDefaultTee(stream);
+    }
+    function ReadableStreamDefaultTee(stream, cloneForBranch2) {
+        var reader = AcquireReadableStreamDefaultReader(stream);
+        var reading = false;
+        var readAgain = false;
+        var canceled1 = false;
+        var canceled2 = false;
+        var reason1;
+        var reason2;
+        var branch1;
+        var branch2;
+        var resolveCancelPromise;
+        var cancelPromise = newPromise(function (resolve) {
+            resolveCancelPromise = resolve;
+        });
+        function pullAlgorithm() {
+            if (reading) {
+                readAgain = true;
+                return promiseResolvedWith(undefined);
+            }
+            reading = true;
+            var readRequest = {
+                _chunkSteps: function (chunk) {
+                    // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                    // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                    // successful synchronously-available reads get ahead of asynchronously-available errors.
+                    queueMicrotask(function () {
+                        readAgain = false;
+                        var chunk1 = chunk;
+                        var chunk2 = chunk;
+                        // There is no way to access the cloning code right now in the reference implementation.
+                        // If we add one then we'll need an implementation for serializable objects.
+                        // if (!canceled2 && cloneForBranch2) {
+                        //   chunk2 = StructuredDeserialize(StructuredSerialize(chunk2));
+                        // }
+                        if (!canceled1) {
+                            ReadableStreamDefaultControllerEnqueue(branch1._readableStreamController, chunk1);
+                        }
+                        if (!canceled2) {
+                            ReadableStreamDefaultControllerEnqueue(branch2._readableStreamController, chunk2);
+                        }
+                        reading = false;
+                        if (readAgain) {
+                            pullAlgorithm();
+                        }
+                    });
+                },
+                _closeSteps: function () {
+                    reading = false;
+                    if (!canceled1) {
+                        ReadableStreamDefaultControllerClose(branch1._readableStreamController);
+                    }
+                    if (!canceled2) {
+                        ReadableStreamDefaultControllerClose(branch2._readableStreamController);
+                    }
+                    if (!canceled1 || !canceled2) {
+                        resolveCancelPromise(undefined);
+                    }
+                },
+                _errorSteps: function () {
+                    reading = false;
+                }
+            };
+            ReadableStreamDefaultReaderRead(reader, readRequest);
+            return promiseResolvedWith(undefined);
+        }
+        function cancel1Algorithm(reason) {
+            canceled1 = true;
+            reason1 = reason;
+            if (canceled2) {
+                var compositeReason = CreateArrayFromList([reason1, reason2]);
+                var cancelResult = ReadableStreamCancel(stream, compositeReason);
+                resolveCancelPromise(cancelResult);
+            }
+            return cancelPromise;
+        }
+        function cancel2Algorithm(reason) {
+            canceled2 = true;
+            reason2 = reason;
+            if (canceled1) {
+                var compositeReason = CreateArrayFromList([reason1, reason2]);
+                var cancelResult = ReadableStreamCancel(stream, compositeReason);
+                resolveCancelPromise(cancelResult);
+            }
+            return cancelPromise;
+        }
+        function startAlgorithm() {
+            // do nothing
+        }
+        branch1 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel1Algorithm);
+        branch2 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel2Algorithm);
+        uponRejection(reader._closedPromise, function (r) {
+            ReadableStreamDefaultControllerError(branch1._readableStreamController, r);
+            ReadableStreamDefaultControllerError(branch2._readableStreamController, r);
+            if (!canceled1 || !canceled2) {
+                resolveCancelPromise(undefined);
+            }
+        });
+        return [branch1, branch2];
+    }
+    function ReadableByteStreamTee(stream) {
+        var reader = AcquireReadableStreamDefaultReader(stream);
+        var reading = false;
+        var readAgainForBranch1 = false;
+        var readAgainForBranch2 = false;
+        var canceled1 = false;
+        var canceled2 = false;
+        var reason1;
+        var reason2;
+        var branch1;
+        var branch2;
+        var resolveCancelPromise;
+        var cancelPromise = newPromise(function (resolve) {
+            resolveCancelPromise = resolve;
+        });
+        function forwardReaderError(thisReader) {
+            uponRejection(thisReader._closedPromise, function (r) {
+                if (thisReader !== reader) {
+                    return;
+                }
+                ReadableByteStreamControllerError(branch1._readableStreamController, r);
+                ReadableByteStreamControllerError(branch2._readableStreamController, r);
+                if (!canceled1 || !canceled2) {
+                    resolveCancelPromise(undefined);
+                }
+            });
+        }
+        function pullWithDefaultReader() {
+            if (IsReadableStreamBYOBReader(reader)) {
+                ReadableStreamReaderGenericRelease(reader);
+                reader = AcquireReadableStreamDefaultReader(stream);
+                forwardReaderError(reader);
+            }
+            var readRequest = {
+                _chunkSteps: function (chunk) {
+                    // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                    // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                    // successful synchronously-available reads get ahead of asynchronously-available errors.
+                    queueMicrotask(function () {
+                        readAgainForBranch1 = false;
+                        readAgainForBranch2 = false;
+                        var chunk1 = chunk;
+                        var chunk2 = chunk;
+                        if (!canceled1 && !canceled2) {
+                            try {
+                                chunk2 = CloneAsUint8Array(chunk);
+                            }
+                            catch (cloneE) {
+                                ReadableByteStreamControllerError(branch1._readableStreamController, cloneE);
+                                ReadableByteStreamControllerError(branch2._readableStreamController, cloneE);
+                                resolveCancelPromise(ReadableStreamCancel(stream, cloneE));
+                                return;
+                            }
+                        }
+                        if (!canceled1) {
+                            ReadableByteStreamControllerEnqueue(branch1._readableStreamController, chunk1);
+                        }
+                        if (!canceled2) {
+                            ReadableByteStreamControllerEnqueue(branch2._readableStreamController, chunk2);
+                        }
+                        reading = false;
+                        if (readAgainForBranch1) {
+                            pull1Algorithm();
+                        }
+                        else if (readAgainForBranch2) {
+                            pull2Algorithm();
+                        }
+                    });
+                },
+                _closeSteps: function () {
+                    reading = false;
+                    if (!canceled1) {
+                        ReadableByteStreamControllerClose(branch1._readableStreamController);
+                    }
+                    if (!canceled2) {
+                        ReadableByteStreamControllerClose(branch2._readableStreamController);
+                    }
+                    if (branch1._readableStreamController._pendingPullIntos.length > 0) {
+                        ReadableByteStreamControllerRespond(branch1._readableStreamController, 0);
+                    }
+                    if (branch2._readableStreamController._pendingPullIntos.length > 0) {
+                        ReadableByteStreamControllerRespond(branch2._readableStreamController, 0);
+                    }
+                    if (!canceled1 || !canceled2) {
+                        resolveCancelPromise(undefined);
+                    }
+                },
+                _errorSteps: function () {
+                    reading = false;
+                }
+            };
+            ReadableStreamDefaultReaderRead(reader, readRequest);
+        }
+        function pullWithBYOBReader(view, forBranch2) {
+            if (IsReadableStreamDefaultReader(reader)) {
+                ReadableStreamReaderGenericRelease(reader);
+                reader = AcquireReadableStreamBYOBReader(stream);
+                forwardReaderError(reader);
+            }
+            var byobBranch = forBranch2 ? branch2 : branch1;
+            var otherBranch = forBranch2 ? branch1 : branch2;
+            var readIntoRequest = {
+                _chunkSteps: function (chunk) {
+                    // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                    // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                    // successful synchronously-available reads get ahead of asynchronously-available errors.
+                    queueMicrotask(function () {
+                        readAgainForBranch1 = false;
+                        readAgainForBranch2 = false;
+                        var byobCanceled = forBranch2 ? canceled2 : canceled1;
+                        var otherCanceled = forBranch2 ? canceled1 : canceled2;
+                        if (!otherCanceled) {
+                            var clonedChunk = void 0;
+                            try {
+                                clonedChunk = CloneAsUint8Array(chunk);
+                            }
+                            catch (cloneE) {
+                                ReadableByteStreamControllerError(byobBranch._readableStreamController, cloneE);
+                                ReadableByteStreamControllerError(otherBranch._readableStreamController, cloneE);
+                                resolveCancelPromise(ReadableStreamCancel(stream, cloneE));
+                                return;
+                            }
+                            if (!byobCanceled) {
+                                ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                            }
+                            ReadableByteStreamControllerEnqueue(otherBranch._readableStreamController, clonedChunk);
+                        }
+                        else if (!byobCanceled) {
+                            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                        }
+                        reading = false;
+                        if (readAgainForBranch1) {
+                            pull1Algorithm();
+                        }
+                        else if (readAgainForBranch2) {
+                            pull2Algorithm();
+                        }
+                    });
+                },
+                _closeSteps: function (chunk) {
+                    reading = false;
+                    var byobCanceled = forBranch2 ? canceled2 : canceled1;
+                    var otherCanceled = forBranch2 ? canceled1 : canceled2;
+                    if (!byobCanceled) {
+                        ReadableByteStreamControllerClose(byobBranch._readableStreamController);
+                    }
+                    if (!otherCanceled) {
+                        ReadableByteStreamControllerClose(otherBranch._readableStreamController);
+                    }
+                    if (chunk !== undefined) {
+                        if (!byobCanceled) {
+                            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                        }
+                        if (!otherCanceled && otherBranch._readableStreamController._pendingPullIntos.length > 0) {
+                            ReadableByteStreamControllerRespond(otherBranch._readableStreamController, 0);
+                        }
+                    }
+                    if (!byobCanceled || !otherCanceled) {
+                        resolveCancelPromise(undefined);
+                    }
+                },
+                _errorSteps: function () {
+                    reading = false;
+                }
+            };
+            ReadableStreamBYOBReaderRead(reader, view, readIntoRequest);
+        }
+        function pull1Algorithm() {
+            if (reading) {
+                readAgainForBranch1 = true;
+                return promiseResolvedWith(undefined);
+            }
+            reading = true;
+            var byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch1._readableStreamController);
+            if (byobRequest === null) {
+                pullWithDefaultReader();
+            }
+            else {
+                pullWithBYOBReader(byobRequest._view, false);
+            }
+            return promiseResolvedWith(undefined);
+        }
+        function pull2Algorithm() {
+            if (reading) {
+                readAgainForBranch2 = true;
+                return promiseResolvedWith(undefined);
+            }
+            reading = true;
+            var byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch2._readableStreamController);
+            if (byobRequest === null) {
+                pullWithDefaultReader();
+            }
+            else {
+                pullWithBYOBReader(byobRequest._view, true);
+            }
+            return promiseResolvedWith(undefined);
+        }
+        function cancel1Algorithm(reason) {
+            canceled1 = true;
+            reason1 = reason;
+            if (canceled2) {
+                var compositeReason = CreateArrayFromList([reason1, reason2]);
+                var cancelResult = ReadableStreamCancel(stream, compositeReason);
+                resolveCancelPromise(cancelResult);
+            }
+            return cancelPromise;
+        }
+        function cancel2Algorithm(reason) {
+            canceled2 = true;
+            reason2 = reason;
+            if (canceled1) {
+                var compositeReason = CreateArrayFromList([reason1, reason2]);
+                var cancelResult = ReadableStreamCancel(stream, compositeReason);
+                resolveCancelPromise(cancelResult);
+            }
+            return cancelPromise;
+        }
+        function startAlgorithm() {
+            return;
+        }
+        branch1 = CreateReadableByteStream(startAlgorithm, pull1Algorithm, cancel1Algorithm);
+        branch2 = CreateReadableByteStream(startAlgorithm, pull2Algorithm, cancel2Algorithm);
+        forwardReaderError(reader);
+        return [branch1, branch2];
+    }
+
+    function convertUnderlyingDefaultOrByteSource(source, context) {
+        assertDictionary(source, context);
+        var original = source;
+        var autoAllocateChunkSize = original === null || original === void 0 ? void 0 : original.autoAllocateChunkSize;
+        var cancel = original === null || original === void 0 ? void 0 : original.cancel;
+        var pull = original === null || original === void 0 ? void 0 : original.pull;
+        var start = original === null || original === void 0 ? void 0 : original.start;
+        var type = original === null || original === void 0 ? void 0 : original.type;
+        return {
+            autoAllocateChunkSize: autoAllocateChunkSize === undefined ?
+                undefined :
+                convertUnsignedLongLongWithEnforceRange(autoAllocateChunkSize, context + " has member 'autoAllocateChunkSize' that"),
+            cancel: cancel === undefined ?
+                undefined :
+                convertUnderlyingSourceCancelCallback(cancel, original, context + " has member 'cancel' that"),
+            pull: pull === undefined ?
+                undefined :
+                convertUnderlyingSourcePullCallback(pull, original, context + " has member 'pull' that"),
+            start: start === undefined ?
+                undefined :
+                convertUnderlyingSourceStartCallback(start, original, context + " has member 'start' that"),
+            type: type === undefined ? undefined : convertReadableStreamType(type, context + " has member 'type' that")
+        };
+    }
+    function convertUnderlyingSourceCancelCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return function (reason) { return promiseCall(fn, original, [reason]); };
+    }
+    function convertUnderlyingSourcePullCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return function (controller) { return promiseCall(fn, original, [controller]); };
+    }
+    function convertUnderlyingSourceStartCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return function (controller) { return reflectCall(fn, original, [controller]); };
+    }
+    function convertReadableStreamType(type, context) {
+        type = "" + type;
+        if (type !== 'bytes') {
+            throw new TypeError(context + " '" + type + "' is not a valid enumeration value for ReadableStreamType");
+        }
+        return type;
+    }
+
+    function convertReaderOptions(options, context) {
+        assertDictionary(options, context);
+        var mode = options === null || options === void 0 ? void 0 : options.mode;
+        return {
+            mode: mode === undefined ? undefined : convertReadableStreamReaderMode(mode, context + " has member 'mode' that")
+        };
+    }
+    function convertReadableStreamReaderMode(mode, context) {
+        mode = "" + mode;
+        if (mode !== 'byob') {
+            throw new TypeError(context + " '" + mode + "' is not a valid enumeration value for ReadableStreamReaderMode");
+        }
+        return mode;
+    }
+
+    function convertIteratorOptions(options, context) {
+        assertDictionary(options, context);
+        var preventCancel = options === null || options === void 0 ? void 0 : options.preventCancel;
+        return { preventCancel: Boolean(preventCancel) };
+    }
+
+    function convertPipeOptions(options, context) {
+        assertDictionary(options, context);
+        var preventAbort = options === null || options === void 0 ? void 0 : options.preventAbort;
+        var preventCancel = options === null || options === void 0 ? void 0 : options.preventCancel;
+        var preventClose = options === null || options === void 0 ? void 0 : options.preventClose;
+        var signal = options === null || options === void 0 ? void 0 : options.signal;
+        if (signal !== undefined) {
+            assertAbortSignal(signal, context + " has member 'signal' that");
+        }
+        return {
+            preventAbort: Boolean(preventAbort),
+            preventCancel: Boolean(preventCancel),
+            preventClose: Boolean(preventClose),
+            signal: signal
+        };
+    }
+    function assertAbortSignal(signal, context) {
+        if (!isAbortSignal(signal)) {
+            throw new TypeError(context + " is not an AbortSignal.");
+        }
+    }
+
+    function convertReadableWritablePair(pair, context) {
+        assertDictionary(pair, context);
+        var readable = pair === null || pair === void 0 ? void 0 : pair.readable;
+        assertRequiredField(readable, 'readable', 'ReadableWritablePair');
+        assertReadableStream(readable, context + " has member 'readable' that");
+        var writable = pair === null || pair === void 0 ? void 0 : pair.writable;
+        assertRequiredField(writable, 'writable', 'ReadableWritablePair');
+        assertWritableStream(writable, context + " has member 'writable' that");
+        return { readable: readable, writable: writable };
+    }
+
+    /**
+     * A readable stream represents a source of data, from which you can read.
+     *
+     * @public
+     */
+    var ReadableStream = /** @class */ (function () {
+        function ReadableStream(rawUnderlyingSource, rawStrategy) {
+            if (rawUnderlyingSource === void 0) { rawUnderlyingSource = {}; }
+            if (rawStrategy === void 0) { rawStrategy = {}; }
+            if (rawUnderlyingSource === undefined) {
+                rawUnderlyingSource = null;
+            }
+            else {
+                assertObject(rawUnderlyingSource, 'First parameter');
+            }
+            var strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');
+            var underlyingSource = convertUnderlyingDefaultOrByteSource(rawUnderlyingSource, 'First parameter');
+            InitializeReadableStream(this);
+            if (underlyingSource.type === 'bytes') {
+                if (strategy.size !== undefined) {
+                    throw new RangeError('The strategy for a byte stream cannot have a size function');
+                }
+                var highWaterMark = ExtractHighWaterMark(strategy, 0);
+                SetUpReadableByteStreamControllerFromUnderlyingSource(this, underlyingSource, highWaterMark);
+            }
+            else {
+                var sizeAlgorithm = ExtractSizeAlgorithm(strategy);
+                var highWaterMark = ExtractHighWaterMark(strategy, 1);
+                SetUpReadableStreamDefaultControllerFromUnderlyingSource(this, underlyingSource, highWaterMark, sizeAlgorithm);
+            }
+        }
+        Object.defineProperty(ReadableStream.prototype, "locked", {
+            /**
+             * Whether or not the readable stream is locked to a {@link ReadableStreamDefaultReader | reader}.
+             */
+            get: function () {
+                if (!IsReadableStream(this)) {
+                    throw streamBrandCheckException$1('locked');
+                }
+                return IsReadableStreamLocked(this);
+            },
+            enumerable: false,
+            configurable: true
+        });
+        /**
+         * Cancels the stream, signaling a loss of interest in the stream by a consumer.
+         *
+         * The supplied `reason` argument will be given to the underlying source's {@link UnderlyingSource.cancel | cancel()}
+         * method, which might or might not use it.
+         */
+        ReadableStream.prototype.cancel = function (reason) {
+            if (reason === void 0) { reason = undefined; }
+            if (!IsReadableStream(this)) {
+                return promiseRejectedWith(streamBrandCheckException$1('cancel'));
+            }
+            if (IsReadableStreamLocked(this)) {
+                return promiseRejectedWith(new TypeError('Cannot cancel a stream that already has a reader'));
+            }
+            return ReadableStreamCancel(this, reason);
+        };
+        ReadableStream.prototype.getReader = function (rawOptions) {
+            if (rawOptions === void 0) { rawOptions = undefined; }
+            if (!IsReadableStream(this)) {
+                throw streamBrandCheckException$1('getReader');
+            }
+            var options = convertReaderOptions(rawOptions, 'First parameter');
+            if (options.mode === undefined) {
+                return AcquireReadableStreamDefaultReader(this);
+            }
+            return AcquireReadableStreamBYOBReader(this);
+        };
+        ReadableStream.prototype.pipeThrough = function (rawTransform, rawOptions) {
+            if (rawOptions === void 0) { rawOptions = {}; }
+            if (!IsReadableStream(this)) {
+                throw streamBrandCheckException$1('pipeThrough');
+            }
+            assertRequiredArgument(rawTransform, 1, 'pipeThrough');
+            var transform = convertReadableWritablePair(rawTransform, 'First parameter');
+            var options = convertPipeOptions(rawOptions, 'Second parameter');
+            if (IsReadableStreamLocked(this)) {
+                throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked ReadableStream');
+            }
+            if (IsWritableStreamLocked(transform.writable)) {
+                throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked WritableStream');
+            }
+            var promise = ReadableStreamPipeTo(this, transform.writable, options.preventClose, options.preventAbort, options.preventCancel, options.signal);
+            setPromiseIsHandledToTrue(promise);
+            return transform.readable;
+        };
+        ReadableStream.prototype.pipeTo = function (destination, rawOptions) {
+            if (rawOptions === void 0) { rawOptions = {}; }
+            if (!IsReadableStream(this)) {
+                return promiseRejectedWith(streamBrandCheckException$1('pipeTo'));
+            }
+            if (destination === undefined) {
+                return promiseRejectedWith("Parameter 1 is required in 'pipeTo'.");
+            }
+            if (!IsWritableStream(destination)) {
+                return promiseRejectedWith(new TypeError("ReadableStream.prototype.pipeTo's first argument must be a WritableStream"));
+            }
+            var options;
+            try {
+                options = convertPipeOptions(rawOptions, 'Second parameter');
+            }
+            catch (e) {
+                return promiseRejectedWith(e);
+            }
+            if (IsReadableStreamLocked(this)) {
+                return promiseRejectedWith(new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream'));
+            }
+            if (IsWritableStreamLocked(destination)) {
+                return promiseRejectedWith(new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream'));
+            }
+            return ReadableStreamPipeTo(this, destination, options.preventClose, options.preventAbort, options.preventCancel, options.signal);
+        };
+        /**
+         * Tees this readable stream, returning a two-element array containing the two resulting branches as
+         * new {@link ReadableStream} instances.
+         *
+         * Teeing a stream will lock it, preventing any other consumer from acquiring a reader.
+         * To cancel the stream, cancel both of the resulting branches; a composite cancellation reason will then be
+         * propagated to the stream's underlying source.
+         *
+         * Note that the chunks seen in each branch will be the same object. If the chunks are not immutable,
+         * this could allow interference between the two branches.
+         */
+        ReadableStream.prototype.tee = function () {
+            if (!IsReadableStream(this)) {
+                throw streamBrandCheckException$1('tee');
+            }
+            var branches = ReadableStreamTee(this);
+            return CreateArrayFromList(branches);
+        };
+        ReadableStream.prototype.values = function (rawOptions) {
+            if (rawOptions === void 0) { rawOptions = undefined; }
+            if (!IsReadableStream(this)) {
+                throw streamBrandCheckException$1('values');
+            }
+            var options = convertIteratorOptions(rawOptions, 'First parameter');
+            return AcquireReadableStreamAsyncIterator(this, options.preventCancel);
+        };
+        return ReadableStream;
+    }());
+    Object.defineProperties(ReadableStream.prototype, {
+        cancel: { enumerable: true },
+        getReader: { enumerable: true },
+        pipeThrough: { enumerable: true },
+        pipeTo: { enumerable: true },
+        tee: { enumerable: true },
+        values: { enumerable: true },
+        locked: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ReadableStream.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ReadableStream',
+            configurable: true
+        });
+    }
+    if (typeof SymbolPolyfill.asyncIterator === 'symbol') {
+        Object.defineProperty(ReadableStream.prototype, SymbolPolyfill.asyncIterator, {
+            value: ReadableStream.prototype.values,
+            writable: true,
+            configurable: true
+        });
+    }
+    // Abstract operations for the ReadableStream.
+    // Throws if and only if startAlgorithm throws.
+    function CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm) {
+        if (highWaterMark === void 0) { highWaterMark = 1; }
+        if (sizeAlgorithm === void 0) { sizeAlgorithm = function () { return 1; }; }
+        var stream = Object.create(ReadableStream.prototype);
+        InitializeReadableStream(stream);
+        var controller = Object.create(ReadableStreamDefaultController.prototype);
+        SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm);
+        return stream;
+    }
+    // Throws if and only if startAlgorithm throws.
+    function CreateReadableByteStream(startAlgorithm, pullAlgorithm, cancelAlgorithm) {
+        var stream = Object.create(ReadableStream.prototype);
+        InitializeReadableStream(stream);
+        var controller = Object.create(ReadableByteStreamController.prototype);
+        SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, 0, undefined);
+        return stream;
+    }
+    function InitializeReadableStream(stream) {
+        stream._state = 'readable';
+        stream._reader = undefined;
+        stream._storedError = undefined;
+        stream._disturbed = false;
+    }
+    function IsReadableStream(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_readableStreamController')) {
+            return false;
+        }
+        return x instanceof ReadableStream;
+    }
+    function IsReadableStreamLocked(stream) {
+        if (stream._reader === undefined) {
+            return false;
+        }
+        return true;
+    }
+    // ReadableStream API exposed for controllers.
+    function ReadableStreamCancel(stream, reason) {
+        stream._disturbed = true;
+        if (stream._state === 'closed') {
+            return promiseResolvedWith(undefined);
+        }
+        if (stream._state === 'errored') {
+            return promiseRejectedWith(stream._storedError);
+        }
+        ReadableStreamClose(stream);
+        var reader = stream._reader;
+        if (reader !== undefined && IsReadableStreamBYOBReader(reader)) {
+            reader._readIntoRequests.forEach(function (readIntoRequest) {
+                readIntoRequest._closeSteps(undefined);
+            });
+            reader._readIntoRequests = new SimpleQueue();
+        }
+        var sourceCancelPromise = stream._readableStreamController[CancelSteps](reason);
+        return transformPromiseWith(sourceCancelPromise, noop);
+    }
+    function ReadableStreamClose(stream) {
+        stream._state = 'closed';
+        var reader = stream._reader;
+        if (reader === undefined) {
+            return;
+        }
+        defaultReaderClosedPromiseResolve(reader);
+        if (IsReadableStreamDefaultReader(reader)) {
+            reader._readRequests.forEach(function (readRequest) {
+                readRequest._closeSteps();
+            });
+            reader._readRequests = new SimpleQueue();
+        }
+    }
+    function ReadableStreamError(stream, e) {
+        stream._state = 'errored';
+        stream._storedError = e;
+        var reader = stream._reader;
+        if (reader === undefined) {
+            return;
+        }
+        defaultReaderClosedPromiseReject(reader, e);
+        if (IsReadableStreamDefaultReader(reader)) {
+            reader._readRequests.forEach(function (readRequest) {
+                readRequest._errorSteps(e);
+            });
+            reader._readRequests = new SimpleQueue();
+        }
+        else {
+            reader._readIntoRequests.forEach(function (readIntoRequest) {
+                readIntoRequest._errorSteps(e);
+            });
+            reader._readIntoRequests = new SimpleQueue();
+        }
+    }
+    // Helper functions for the ReadableStream.
+    function streamBrandCheckException$1(name) {
+        return new TypeError("ReadableStream.prototype." + name + " can only be used on a ReadableStream");
+    }
+
+    function convertQueuingStrategyInit(init, context) {
+        assertDictionary(init, context);
+        var highWaterMark = init === null || init === void 0 ? void 0 : init.highWaterMark;
+        assertRequiredField(highWaterMark, 'highWaterMark', 'QueuingStrategyInit');
+        return {
+            highWaterMark: convertUnrestrictedDouble(highWaterMark)
+        };
+    }
+
+    // The size function must not have a prototype property nor be a constructor
+    var byteLengthSizeFunction = function (chunk) {
+        return chunk.byteLength;
+    };
+    try {
+        Object.defineProperty(byteLengthSizeFunction, 'name', {
+            value: 'size',
+            configurable: true
+        });
+    }
+    catch (_a) {
+        // This property is non-configurable in older browsers, so ignore if this throws.
+        // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility
+    }
+    /**
+     * A queuing strategy that counts the number of bytes in each chunk.
+     *
+     * @public
+     */
+    var ByteLengthQueuingStrategy = /** @class */ (function () {
+        function ByteLengthQueuingStrategy(options) {
+            assertRequiredArgument(options, 1, 'ByteLengthQueuingStrategy');
+            options = convertQueuingStrategyInit(options, 'First parameter');
+            this._byteLengthQueuingStrategyHighWaterMark = options.highWaterMark;
+        }
+        Object.defineProperty(ByteLengthQueuingStrategy.prototype, "highWaterMark", {
+            /**
+             * Returns the high water mark provided to the constructor.
+             */
+            get: function () {
+                if (!IsByteLengthQueuingStrategy(this)) {
+                    throw byteLengthBrandCheckException('highWaterMark');
+                }
+                return this._byteLengthQueuingStrategyHighWaterMark;
+            },
+            enumerable: false,
+            configurable: true
+        });
+        Object.defineProperty(ByteLengthQueuingStrategy.prototype, "size", {
+            /**
+             * Measures the size of `chunk` by returning the value of its `byteLength` property.
+             */
+            get: function () {
+                if (!IsByteLengthQueuingStrategy(this)) {
+                    throw byteLengthBrandCheckException('size');
+                }
+                return byteLengthSizeFunction;
+            },
+            enumerable: false,
+            configurable: true
+        });
+        return ByteLengthQueuingStrategy;
+    }());
+    Object.defineProperties(ByteLengthQueuingStrategy.prototype, {
+        highWaterMark: { enumerable: true },
+        size: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(ByteLengthQueuingStrategy.prototype, SymbolPolyfill.toStringTag, {
+            value: 'ByteLengthQueuingStrategy',
+            configurable: true
+        });
+    }
+    // Helper functions for the ByteLengthQueuingStrategy.
+    function byteLengthBrandCheckException(name) {
+        return new TypeError("ByteLengthQueuingStrategy.prototype." + name + " can only be used on a ByteLengthQueuingStrategy");
+    }
+    function IsByteLengthQueuingStrategy(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_byteLengthQueuingStrategyHighWaterMark')) {
+            return false;
+        }
+        return x instanceof ByteLengthQueuingStrategy;
+    }
+
+    // The size function must not have a prototype property nor be a constructor
+    var countSizeFunction = function () {
+        return 1;
+    };
+    try {
+        Object.defineProperty(countSizeFunction, 'name', {
+            value: 'size',
+            configurable: true
+        });
+    }
+    catch (_a) {
+        // This property is non-configurable in older browsers, so ignore if this throws.
+        // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility
+    }
+    /**
+     * A queuing strategy that counts the number of chunks.
+     *
+     * @public
+     */
+    var CountQueuingStrategy = /** @class */ (function () {
+        function CountQueuingStrategy(options) {
+            assertRequiredArgument(options, 1, 'CountQueuingStrategy');
+            options = convertQueuingStrategyInit(options, 'First parameter');
+            this._countQueuingStrategyHighWaterMark = options.highWaterMark;
+        }
+        Object.defineProperty(CountQueuingStrategy.prototype, "highWaterMark", {
+            /**
+             * Returns the high water mark provided to the constructor.
+             */
+            get: function () {
+                if (!IsCountQueuingStrategy(this)) {
+                    throw countBrandCheckException('highWaterMark');
+                }
+                return this._countQueuingStrategyHighWaterMark;
+            },
+            enumerable: false,
+            configurable: true
+        });
+        Object.defineProperty(CountQueuingStrategy.prototype, "size", {
+            /**
+             * Measures the size of `chunk` by always returning 1.
+             * This ensures that the total queue size is a count of the number of chunks in the queue.
+             */
+            get: function () {
+                if (!IsCountQueuingStrategy(this)) {
+                    throw countBrandCheckException('size');
+                }
+                return countSizeFunction;
+            },
+            enumerable: false,
+            configurable: true
+        });
+        return CountQueuingStrategy;
+    }());
+    Object.defineProperties(CountQueuingStrategy.prototype, {
+        highWaterMark: { enumerable: true },
+        size: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(CountQueuingStrategy.prototype, SymbolPolyfill.toStringTag, {
+            value: 'CountQueuingStrategy',
+            configurable: true
+        });
+    }
+    // Helper functions for the CountQueuingStrategy.
+    function countBrandCheckException(name) {
+        return new TypeError("CountQueuingStrategy.prototype." + name + " can only be used on a CountQueuingStrategy");
+    }
+    function IsCountQueuingStrategy(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_countQueuingStrategyHighWaterMark')) {
+            return false;
+        }
+        return x instanceof CountQueuingStrategy;
+    }
+
+    function convertTransformer(original, context) {
+        assertDictionary(original, context);
+        var flush = original === null || original === void 0 ? void 0 : original.flush;
+        var readableType = original === null || original === void 0 ? void 0 : original.readableType;
+        var start = original === null || original === void 0 ? void 0 : original.start;
+        var transform = original === null || original === void 0 ? void 0 : original.transform;
+        var writableType = original === null || original === void 0 ? void 0 : original.writableType;
+        return {
+            flush: flush === undefined ?
+                undefined :
+                convertTransformerFlushCallback(flush, original, context + " has member 'flush' that"),
+            readableType: readableType,
+            start: start === undefined ?
+                undefined :
+                convertTransformerStartCallback(start, original, context + " has member 'start' that"),
+            transform: transform === undefined ?
+                undefined :
+                convertTransformerTransformCallback(transform, original, context + " has member 'transform' that"),
+            writableType: writableType
+        };
+    }
+    function convertTransformerFlushCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return function (controller) { return promiseCall(fn, original, [controller]); };
+    }
+    function convertTransformerStartCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return function (controller) { return reflectCall(fn, original, [controller]); };
+    }
+    function convertTransformerTransformCallback(fn, original, context) {
+        assertFunction(fn, context);
+        return function (chunk, controller) { return promiseCall(fn, original, [chunk, controller]); };
+    }
+
+    // Class TransformStream
+    /**
+     * A transform stream consists of a pair of streams: a {@link WritableStream | writable stream},
+     * known as its writable side, and a {@link ReadableStream | readable stream}, known as its readable side.
+     * In a manner specific to the transform stream in question, writes to the writable side result in new data being
+     * made available for reading from the readable side.
+     *
+     * @public
+     */
+    var TransformStream = /** @class */ (function () {
+        function TransformStream(rawTransformer, rawWritableStrategy, rawReadableStrategy) {
+            if (rawTransformer === void 0) { rawTransformer = {}; }
+            if (rawWritableStrategy === void 0) { rawWritableStrategy = {}; }
+            if (rawReadableStrategy === void 0) { rawReadableStrategy = {}; }
+            if (rawTransformer === undefined) {
+                rawTransformer = null;
+            }
+            var writableStrategy = convertQueuingStrategy(rawWritableStrategy, 'Second parameter');
+            var readableStrategy = convertQueuingStrategy(rawReadableStrategy, 'Third parameter');
+            var transformer = convertTransformer(rawTransformer, 'First parameter');
+            if (transformer.readableType !== undefined) {
+                throw new RangeError('Invalid readableType specified');
+            }
+            if (transformer.writableType !== undefined) {
+                throw new RangeError('Invalid writableType specified');
+            }
+            var readableHighWaterMark = ExtractHighWaterMark(readableStrategy, 0);
+            var readableSizeAlgorithm = ExtractSizeAlgorithm(readableStrategy);
+            var writableHighWaterMark = ExtractHighWaterMark(writableStrategy, 1);
+            var writableSizeAlgorithm = ExtractSizeAlgorithm(writableStrategy);
+            var startPromise_resolve;
+            var startPromise = newPromise(function (resolve) {
+                startPromise_resolve = resolve;
+            });
+            InitializeTransformStream(this, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm);
+            SetUpTransformStreamDefaultControllerFromTransformer(this, transformer);
+            if (transformer.start !== undefined) {
+                startPromise_resolve(transformer.start(this._transformStreamController));
+            }
+            else {
+                startPromise_resolve(undefined);
+            }
+        }
+        Object.defineProperty(TransformStream.prototype, "readable", {
+            /**
+             * The readable side of the transform stream.
+             */
+            get: function () {
+                if (!IsTransformStream(this)) {
+                    throw streamBrandCheckException('readable');
+                }
+                return this._readable;
+            },
+            enumerable: false,
+            configurable: true
+        });
+        Object.defineProperty(TransformStream.prototype, "writable", {
+            /**
+             * The writable side of the transform stream.
+             */
+            get: function () {
+                if (!IsTransformStream(this)) {
+                    throw streamBrandCheckException('writable');
+                }
+                return this._writable;
+            },
+            enumerable: false,
+            configurable: true
+        });
+        return TransformStream;
+    }());
+    Object.defineProperties(TransformStream.prototype, {
+        readable: { enumerable: true },
+        writable: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(TransformStream.prototype, SymbolPolyfill.toStringTag, {
+            value: 'TransformStream',
+            configurable: true
+        });
+    }
+    function InitializeTransformStream(stream, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm) {
+        function startAlgorithm() {
+            return startPromise;
+        }
+        function writeAlgorithm(chunk) {
+            return TransformStreamDefaultSinkWriteAlgorithm(stream, chunk);
+        }
+        function abortAlgorithm(reason) {
+            return TransformStreamDefaultSinkAbortAlgorithm(stream, reason);
+        }
+        function closeAlgorithm() {
+            return TransformStreamDefaultSinkCloseAlgorithm(stream);
+        }
+        stream._writable = CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, writableHighWaterMark, writableSizeAlgorithm);
+        function pullAlgorithm() {
+            return TransformStreamDefaultSourcePullAlgorithm(stream);
+        }
+        function cancelAlgorithm(reason) {
+            TransformStreamErrorWritableAndUnblockWrite(stream, reason);
+            return promiseResolvedWith(undefined);
+        }
+        stream._readable = CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, readableHighWaterMark, readableSizeAlgorithm);
+        // The [[backpressure]] slot is set to undefined so that it can be initialised by TransformStreamSetBackpressure.
+        stream._backpressure = undefined;
+        stream._backpressureChangePromise = undefined;
+        stream._backpressureChangePromise_resolve = undefined;
+        TransformStreamSetBackpressure(stream, true);
+        stream._transformStreamController = undefined;
+    }
+    function IsTransformStream(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_transformStreamController')) {
+            return false;
+        }
+        return x instanceof TransformStream;
+    }
+    // This is a no-op if both sides are already errored.
+    function TransformStreamError(stream, e) {
+        ReadableStreamDefaultControllerError(stream._readable._readableStreamController, e);
+        TransformStreamErrorWritableAndUnblockWrite(stream, e);
+    }
+    function TransformStreamErrorWritableAndUnblockWrite(stream, e) {
+        TransformStreamDefaultControllerClearAlgorithms(stream._transformStreamController);
+        WritableStreamDefaultControllerErrorIfNeeded(stream._writable._writableStreamController, e);
+        if (stream._backpressure) {
+            // Pretend that pull() was called to permit any pending write() calls to complete. TransformStreamSetBackpressure()
+            // cannot be called from enqueue() or pull() once the ReadableStream is errored, so this will will be the final time
+            // _backpressure is set.
+            TransformStreamSetBackpressure(stream, false);
+        }
+    }
+    function TransformStreamSetBackpressure(stream, backpressure) {
+        // Passes also when called during construction.
+        if (stream._backpressureChangePromise !== undefined) {
+            stream._backpressureChangePromise_resolve();
+        }
+        stream._backpressureChangePromise = newPromise(function (resolve) {
+            stream._backpressureChangePromise_resolve = resolve;
+        });
+        stream._backpressure = backpressure;
+    }
+    // Class TransformStreamDefaultController
+    /**
+     * Allows control of the {@link ReadableStream} and {@link WritableStream} of the associated {@link TransformStream}.
+     *
+     * @public
+     */
+    var TransformStreamDefaultController = /** @class */ (function () {
+        function TransformStreamDefaultController() {
+            throw new TypeError('Illegal constructor');
+        }
+        Object.defineProperty(TransformStreamDefaultController.prototype, "desiredSize", {
+            /**
+             * Returns the desired size to fill the readable side’s internal queue. It can be negative, if the queue is over-full.
+             */
+            get: function () {
+                if (!IsTransformStreamDefaultController(this)) {
+                    throw defaultControllerBrandCheckException('desiredSize');
+                }
+                var readableController = this._controlledTransformStream._readable._readableStreamController;
+                return ReadableStreamDefaultControllerGetDesiredSize(readableController);
+            },
+            enumerable: false,
+            configurable: true
+        });
+        TransformStreamDefaultController.prototype.enqueue = function (chunk) {
+            if (chunk === void 0) { chunk = undefined; }
+            if (!IsTransformStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException('enqueue');
+            }
+            TransformStreamDefaultControllerEnqueue(this, chunk);
+        };
+        /**
+         * Errors both the readable side and the writable side of the controlled transform stream, making all future
+         * interactions with it fail with the given error `e`. Any chunks queued for transformation will be discarded.
+         */
+        TransformStreamDefaultController.prototype.error = function (reason) {
+            if (reason === void 0) { reason = undefined; }
+            if (!IsTransformStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException('error');
+            }
+            TransformStreamDefaultControllerError(this, reason);
+        };
+        /**
+         * Closes the readable side and errors the writable side of the controlled transform stream. This is useful when the
+         * transformer only needs to consume a portion of the chunks written to the writable side.
+         */
+        TransformStreamDefaultController.prototype.terminate = function () {
+            if (!IsTransformStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException('terminate');
+            }
+            TransformStreamDefaultControllerTerminate(this);
+        };
+        return TransformStreamDefaultController;
+    }());
+    Object.defineProperties(TransformStreamDefaultController.prototype, {
+        enqueue: { enumerable: true },
+        error: { enumerable: true },
+        terminate: { enumerable: true },
+        desiredSize: { enumerable: true }
+    });
+    if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+        Object.defineProperty(TransformStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+            value: 'TransformStreamDefaultController',
+            configurable: true
+        });
+    }
+    // Transform Stream Default Controller Abstract Operations
+    function IsTransformStreamDefaultController(x) {
+        if (!typeIsObject(x)) {
+            return false;
+        }
+        if (!Object.prototype.hasOwnProperty.call(x, '_controlledTransformStream')) {
+            return false;
+        }
+        return x instanceof TransformStreamDefaultController;
+    }
+    function SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm) {
+        controller._controlledTransformStream = stream;
+        stream._transformStreamController = controller;
+        controller._transformAlgorithm = transformAlgorithm;
+        controller._flushAlgorithm = flushAlgorithm;
+    }
+    function SetUpTransformStreamDefaultControllerFromTransformer(stream, transformer) {
+        var controller = Object.create(TransformStreamDefaultController.prototype);
+        var transformAlgorithm = function (chunk) {
+            try {
+                TransformStreamDefaultControllerEnqueue(controller, chunk);
+                return promiseResolvedWith(undefined);
+            }
+            catch (transformResultE) {
+                return promiseRejectedWith(transformResultE);
+            }
+        };
+        var flushAlgorithm = function () { return promiseResolvedWith(undefined); };
+        if (transformer.transform !== undefined) {
+            transformAlgorithm = function (chunk) { return transformer.transform(chunk, controller); };
+        }
+        if (transformer.flush !== undefined) {
+            flushAlgorithm = function () { return transformer.flush(controller); };
+        }
+        SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);
+    }
+    function TransformStreamDefaultControllerClearAlgorithms(controller) {
+        controller._transformAlgorithm = undefined;
+        controller._flushAlgorithm = undefined;
+    }
+    function TransformStreamDefaultControllerEnqueue(controller, chunk) {
+        var stream = controller._controlledTransformStream;
+        var readableController = stream._readable._readableStreamController;
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(readableController)) {
+            throw new TypeError('Readable side is not in a state that permits enqueue');
+        }
+        // We throttle transform invocations based on the backpressure of the ReadableStream, but we still
+        // accept TransformStreamDefaultControllerEnqueue() calls.
+        try {
+            ReadableStreamDefaultControllerEnqueue(readableController, chunk);
+        }
+        catch (e) {
+            // This happens when readableStrategy.size() throws.
+            TransformStreamErrorWritableAndUnblockWrite(stream, e);
+            throw stream._readable._storedError;
+        }
+        var backpressure = ReadableStreamDefaultControllerHasBackpressure(readableController);
+        if (backpressure !== stream._backpressure) {
+            TransformStreamSetBackpressure(stream, true);
+        }
+    }
+    function TransformStreamDefaultControllerError(controller, e) {
+        TransformStreamError(controller._controlledTransformStream, e);
+    }
+    function TransformStreamDefaultControllerPerformTransform(controller, chunk) {
+        var transformPromise = controller._transformAlgorithm(chunk);
+        return transformPromiseWith(transformPromise, undefined, function (r) {
+            TransformStreamError(controller._controlledTransformStream, r);
+            throw r;
+        });
+    }
+    function TransformStreamDefaultControllerTerminate(controller) {
+        var stream = controller._controlledTransformStream;
+        var readableController = stream._readable._readableStreamController;
+        ReadableStreamDefaultControllerClose(readableController);
+        var error = new TypeError('TransformStream terminated');
+        TransformStreamErrorWritableAndUnblockWrite(stream, error);
+    }
+    // TransformStreamDefaultSink Algorithms
+    function TransformStreamDefaultSinkWriteAlgorithm(stream, chunk) {
+        var controller = stream._transformStreamController;
+        if (stream._backpressure) {
+            var backpressureChangePromise = stream._backpressureChangePromise;
+            return transformPromiseWith(backpressureChangePromise, function () {
+                var writable = stream._writable;
+                var state = writable._state;
+                if (state === 'erroring') {
+                    throw writable._storedError;
+                }
+                return TransformStreamDefaultControllerPerformTransform(controller, chunk);
+            });
+        }
+        return TransformStreamDefaultControllerPerformTransform(controller, chunk);
+    }
+    function TransformStreamDefaultSinkAbortAlgorithm(stream, reason) {
+        // abort() is not called synchronously, so it is possible for abort() to be called when the stream is already
+        // errored.
+        TransformStreamError(stream, reason);
+        return promiseResolvedWith(undefined);
+    }
+    function TransformStreamDefaultSinkCloseAlgorithm(stream) {
+        // stream._readable cannot change after construction, so caching it across a call to user code is safe.
+        var readable = stream._readable;
+        var controller = stream._transformStreamController;
+        var flushPromise = controller._flushAlgorithm();
+        TransformStreamDefaultControllerClearAlgorithms(controller);
+        // Return a promise that is fulfilled with undefined on success.
+        return transformPromiseWith(flushPromise, function () {
+            if (readable._state === 'errored') {
+                throw readable._storedError;
+            }
+            ReadableStreamDefaultControllerClose(readable._readableStreamController);
+        }, function (r) {
+            TransformStreamError(stream, r);
+            throw readable._storedError;
+        });
+    }
+    // TransformStreamDefaultSource Algorithms
+    function TransformStreamDefaultSourcePullAlgorithm(stream) {
+        // Invariant. Enforced by the promises returned by start() and pull().
+        TransformStreamSetBackpressure(stream, false);
+        // Prevent the next pull() call until there is backpressure.
+        return stream._backpressureChangePromise;
+    }
+    // Helper functions for the TransformStreamDefaultController.
+    function defaultControllerBrandCheckException(name) {
+        return new TypeError("TransformStreamDefaultController.prototype." + name + " can only be used on a TransformStreamDefaultController");
+    }
+    // Helper functions for the TransformStream.
+    function streamBrandCheckException(name) {
+        return new TypeError("TransformStream.prototype." + name + " can only be used on a TransformStream");
+    }
+
+    exports.ByteLengthQueuingStrategy = ByteLengthQueuingStrategy;
+    exports.CountQueuingStrategy = CountQueuingStrategy;
+    exports.ReadableByteStreamController = ReadableByteStreamController;
+    exports.ReadableStream = ReadableStream;
+    exports.ReadableStreamBYOBReader = ReadableStreamBYOBReader;
+    exports.ReadableStreamBYOBRequest = ReadableStreamBYOBRequest;
+    exports.ReadableStreamDefaultController = ReadableStreamDefaultController;
+    exports.ReadableStreamDefaultReader = ReadableStreamDefaultReader;
+    exports.TransformStream = TransformStream;
+    exports.TransformStreamDefaultController = TransformStreamDefaultController;
+    exports.WritableStream = WritableStream;
+    exports.WritableStreamDefaultController = WritableStreamDefaultController;
+    exports.WritableStreamDefaultWriter = WritableStreamDefaultWriter;
+
+    Object.defineProperty(exports, '__esModule', { value: true });
+
+})));
+//# sourceMappingURL=ponyfill.js.map
diff --git a/node_modules/web-streams-polyfill/dist/ponyfill.js.map b/node_modules/web-streams-polyfill/dist/ponyfill.js.map
new file mode 100644
index 0000000..87baccc
--- /dev/null
+++ b/node_modules/web-streams-polyfill/dist/ponyfill.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"ponyfill.js","sources":["../src/stub/symbol.ts","../src/utils.ts","../src/lib/helpers/miscellaneous.ts","../src/lib/helpers/webidl.ts","../src/lib/simple-queue.ts","../src/lib/readable-stream/generic-reader.ts","../src/lib/abstract-ops/internal-methods.ts","../src/stub/number-isfinite.ts","../src/stub/math-trunc.ts","../src/lib/validators/basic.ts","../src/lib/validators/readable-stream.ts","../src/lib/readable-stream/default-reader.ts","../src/target/es5/stub/async-iterator-prototype.ts","../src/lib/readable-stream/async-iterator.ts","../src/stub/number-isnan.ts","../src/lib/abstract-ops/ecmascript.ts","../src/lib/abstract-ops/miscellaneous.ts","../src/lib/abstract-ops/queue-with-sizes.ts","../src/lib/readable-stream/byte-stream-controller.ts","../src/lib/readable-stream/byob-reader.ts","../src/lib/abstract-ops/queuing-strategy.ts","../src/lib/validators/queuing-strategy.ts","../src/lib/validators/underlying-sink.ts","../src/lib/validators/writable-stream.ts","../src/lib/abort-signal.ts","../src/lib/writable-stream.ts","../src/stub/native.ts","../src/stub/dom-exception.ts","../src/lib/readable-stream/pipe.ts","../src/lib/readable-stream/default-controller.ts","../src/lib/readable-stream/tee.ts","../src/lib/validators/underlying-source.ts","../src/lib/validators/reader-options.ts","../src/lib/validators/iterator-options.ts","../src/lib/validators/pipe-options.ts","../src/lib/validators/readable-writable-pair.ts","../src/lib/readable-stream.ts","../src/lib/validators/queuing-strategy-init.ts","../src/lib/byte-length-queuing-strategy.ts","../src/lib/count-queuing-strategy.ts","../src/lib/validators/transformer.ts","../src/lib/transform-stream.ts"],"sourcesContent":["/// <reference lib=\"es2015.symbol\" />\n\nconst SymbolPolyfill: (description?: string) => symbol =\n  typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol' ?\n    Symbol :\n    description => `Symbol(${description})` as any as symbol;\n\nexport default SymbolPolyfill;\n","/// <reference lib=\"dom\" />\n\nexport function noop(): undefined {\n  return undefined;\n}\n\nfunction getGlobals() {\n  if (typeof self !== 'undefined') {\n    return self;\n  } else if (typeof window !== 'undefined') {\n    return window;\n  } else if (typeof global !== 'undefined') {\n    return global;\n  }\n  return undefined;\n}\n\nexport const globals = getGlobals();\n","import { noop } from '../../utils';\nimport { AssertionError } from '../../stub/assert';\n\nexport function typeIsObject(x: any): x is object {\n  return (typeof x === 'object' && x !== null) || typeof x === 'function';\n}\n\nexport const rethrowAssertionErrorRejection: (e: any) => void =\n  DEBUG ? e => {\n    // Used throughout the reference implementation, as `.catch(rethrowAssertionErrorRejection)`, to ensure any errors\n    // get shown. There are places in the spec where we do promise transformations and purposefully ignore or don't\n    // expect any errors, but assertion errors are always problematic.\n    if (e && e instanceof AssertionError) {\n      setTimeout(() => {\n        throw e;\n      }, 0);\n    }\n  } : noop;\n","import { globals } from '../../utils';\nimport { rethrowAssertionErrorRejection } from './miscellaneous';\nimport assert from '../../stub/assert';\n\nconst originalPromise = Promise;\nconst originalPromiseThen = Promise.prototype.then;\nconst originalPromiseResolve = Promise.resolve.bind(originalPromise);\nconst originalPromiseReject = Promise.reject.bind(originalPromise);\n\nexport function newPromise<T>(executor: (\n  resolve: (value: T | PromiseLike<T>) => void,\n  reject: (reason?: any) => void\n) => void): Promise<T> {\n  return new originalPromise(executor);\n}\n\nexport function promiseResolvedWith<T>(value: T | PromiseLike<T>): Promise<T> {\n  return originalPromiseResolve(value);\n}\n\nexport function promiseRejectedWith<T = never>(reason: any): Promise<T> {\n  return originalPromiseReject(reason);\n}\n\nexport function PerformPromiseThen<T, TResult1 = T, TResult2 = never>(\n  promise: Promise<T>,\n  onFulfilled?: (value: T) => TResult1 | PromiseLike<TResult1>,\n  onRejected?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2> {\n  // There doesn't appear to be any way to correctly emulate the behaviour from JavaScript, so this is just an\n  // approximation.\n  return originalPromiseThen.call(promise, onFulfilled, onRejected) as Promise<TResult1 | TResult2>;\n}\n\nexport function uponPromise<T>(\n  promise: Promise<T>,\n  onFulfilled?: (value: T) => void | PromiseLike<void>,\n  onRejected?: (reason: any) => void | PromiseLike<void>): void {\n  PerformPromiseThen(\n    PerformPromiseThen(promise, onFulfilled, onRejected),\n    undefined,\n    rethrowAssertionErrorRejection\n  );\n}\n\nexport function uponFulfillment<T>(promise: Promise<T>, onFulfilled: (value: T) => void | PromiseLike<void>): void {\n  uponPromise(promise, onFulfilled);\n}\n\nexport function uponRejection(promise: Promise<unknown>, onRejected: (reason: any) => void | PromiseLike<void>): void {\n  uponPromise(promise, undefined, onRejected);\n}\n\nexport function transformPromiseWith<T, TResult1 = T, TResult2 = never>(\n  promise: Promise<T>,\n  fulfillmentHandler?: (value: T) => TResult1 | PromiseLike<TResult1>,\n  rejectionHandler?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2> {\n  return PerformPromiseThen(promise, fulfillmentHandler, rejectionHandler);\n}\n\nexport function setPromiseIsHandledToTrue(promise: Promise<unknown>): void {\n  PerformPromiseThen(promise, undefined, rethrowAssertionErrorRejection);\n}\n\nexport const queueMicrotask: (fn: () => void) => void = (() => {\n  const globalQueueMicrotask = globals && globals.queueMicrotask;\n  if (typeof globalQueueMicrotask === 'function') {\n    return globalQueueMicrotask;\n  }\n\n  const resolvedPromise = promiseResolvedWith(undefined);\n  return (fn: () => void) => PerformPromiseThen(resolvedPromise, fn);\n})();\n\nexport function reflectCall<T, A extends any[], R>(F: (this: T, ...fnArgs: A) => R, V: T, args: A): R {\n  if (typeof F !== 'function') {\n    throw new TypeError('Argument is not a function');\n  }\n  return Function.prototype.apply.call(F, V, args);\n}\n\nexport function promiseCall<T, A extends any[], R>(F: (this: T, ...fnArgs: A) => R | PromiseLike<R>,\n                                                   V: T,\n                                                   args: A): Promise<R> {\n  assert(typeof F === 'function');\n  assert(V !== undefined);\n  assert(Array.isArray(args));\n  try {\n    return promiseResolvedWith(reflectCall(F, V, args));\n  } catch (value) {\n    return promiseRejectedWith(value);\n  }\n}\n","import assert from '../stub/assert';\n\n// Original from Chromium\n// https://chromium.googlesource.com/chromium/src/+/0aee4434a4dba42a42abaea9bfbc0cd196a63bc1/third_party/blink/renderer/core/streams/SimpleQueue.js\n\nconst QUEUE_MAX_ARRAY_SIZE = 16384;\n\ninterface Node<T> {\n  _elements: T[];\n  _next: Node<T> | undefined;\n}\n\n/**\n * Simple queue structure.\n *\n * Avoids scalability issues with using a packed array directly by using\n * multiple arrays in a linked list and keeping the array size bounded.\n */\nexport class SimpleQueue<T> {\n  private _front: Node<T>;\n  private _back: Node<T>;\n  private _cursor = 0;\n  private _size = 0;\n\n  constructor() {\n    // _front and _back are always defined.\n    this._front = {\n      _elements: [],\n      _next: undefined\n    };\n    this._back = this._front;\n    // The cursor is used to avoid calling Array.shift().\n    // It contains the index of the front element of the array inside the\n    // front-most node. It is always in the range [0, QUEUE_MAX_ARRAY_SIZE).\n    this._cursor = 0;\n    // When there is only one node, size === elements.length - cursor.\n    this._size = 0;\n  }\n\n  get length(): number {\n    return this._size;\n  }\n\n  // For exception safety, this method is structured in order:\n  // 1. Read state\n  // 2. Calculate required state mutations\n  // 3. Perform state mutations\n  push(element: T): void {\n    const oldBack = this._back;\n    let newBack = oldBack;\n    assert(oldBack._next === undefined);\n    if (oldBack._elements.length === QUEUE_MAX_ARRAY_SIZE - 1) {\n      newBack = {\n        _elements: [],\n        _next: undefined\n      };\n    }\n\n    // push() is the mutation most likely to throw an exception, so it\n    // goes first.\n    oldBack._elements.push(element);\n    if (newBack !== oldBack) {\n      this._back = newBack;\n      oldBack._next = newBack;\n    }\n    ++this._size;\n  }\n\n  // Like push(), shift() follows the read -> calculate -> mutate pattern for\n  // exception safety.\n  shift(): T {\n    assert(this._size > 0); // must not be called on an empty queue\n\n    const oldFront = this._front;\n    let newFront = oldFront;\n    const oldCursor = this._cursor;\n    let newCursor = oldCursor + 1;\n\n    const elements = oldFront._elements;\n    const element = elements[oldCursor];\n\n    if (newCursor === QUEUE_MAX_ARRAY_SIZE) {\n      assert(elements.length === QUEUE_MAX_ARRAY_SIZE);\n      assert(oldFront._next !== undefined);\n      newFront = oldFront._next!;\n      newCursor = 0;\n    }\n\n    // No mutations before this point.\n    --this._size;\n    this._cursor = newCursor;\n    if (oldFront !== newFront) {\n      this._front = newFront;\n    }\n\n    // Permit shifted element to be garbage collected.\n    elements[oldCursor] = undefined!;\n\n    return element;\n  }\n\n  // The tricky thing about forEach() is that it can be called\n  // re-entrantly. The queue may be mutated inside the callback. It is easy to\n  // see that push() within the callback has no negative effects since the end\n  // of the queue is checked for on every iteration. If shift() is called\n  // repeatedly within the callback then the next iteration may return an\n  // element that has been removed. In this case the callback will be called\n  // with undefined values until we either \"catch up\" with elements that still\n  // exist or reach the back of the queue.\n  forEach(callback: (element: T) => void): void {\n    let i = this._cursor;\n    let node = this._front;\n    let elements = node._elements;\n    while (i !== elements.length || node._next !== undefined) {\n      if (i === elements.length) {\n        assert(node._next !== undefined);\n        assert(i === QUEUE_MAX_ARRAY_SIZE);\n        node = node._next!;\n        elements = node._elements;\n        i = 0;\n        if (elements.length === 0) {\n          break;\n        }\n      }\n      callback(elements[i]);\n      ++i;\n    }\n  }\n\n  // Return the element that would be returned if shift() was called now,\n  // without modifying the queue.\n  peek(): T {\n    assert(this._size > 0); // must not be called on an empty queue\n\n    const front = this._front;\n    const cursor = this._cursor;\n    return front._elements[cursor];\n  }\n}\n","import assert from '../../stub/assert';\nimport { ReadableStream, ReadableStreamCancel, ReadableStreamReader } from '../readable-stream';\nimport { newPromise, setPromiseIsHandledToTrue } from '../helpers/webidl';\n\nexport function ReadableStreamReaderGenericInitialize<R>(reader: ReadableStreamReader<R>, stream: ReadableStream<R>) {\n  reader._ownerReadableStream = stream;\n  stream._reader = reader;\n\n  if (stream._state === 'readable') {\n    defaultReaderClosedPromiseInitialize(reader);\n  } else if (stream._state === 'closed') {\n    defaultReaderClosedPromiseInitializeAsResolved(reader);\n  } else {\n    assert(stream._state === 'errored');\n\n    defaultReaderClosedPromiseInitializeAsRejected(reader, stream._storedError);\n  }\n}\n\n// A client of ReadableStreamDefaultReader and ReadableStreamBYOBReader may use these functions directly to bypass state\n// check.\n\nexport function ReadableStreamReaderGenericCancel(reader: ReadableStreamReader<any>, reason: any): Promise<undefined> {\n  const stream = reader._ownerReadableStream;\n  assert(stream !== undefined);\n  return ReadableStreamCancel(stream, reason);\n}\n\nexport function ReadableStreamReaderGenericRelease(reader: ReadableStreamReader<any>) {\n  assert(reader._ownerReadableStream !== undefined);\n  assert(reader._ownerReadableStream._reader === reader);\n\n  if (reader._ownerReadableStream._state === 'readable') {\n    defaultReaderClosedPromiseReject(\n      reader,\n      new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));\n  } else {\n    defaultReaderClosedPromiseResetToRejected(\n      reader,\n      new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));\n  }\n\n  reader._ownerReadableStream._reader = undefined;\n  reader._ownerReadableStream = undefined!;\n}\n\n// Helper functions for the readers.\n\nexport function readerLockException(name: string): TypeError {\n  return new TypeError('Cannot ' + name + ' a stream using a released reader');\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nexport function defaultReaderClosedPromiseInitialize(reader: ReadableStreamReader<any>) {\n  reader._closedPromise = newPromise((resolve, reject) => {\n    reader._closedPromise_resolve = resolve;\n    reader._closedPromise_reject = reject;\n  });\n}\n\nexport function defaultReaderClosedPromiseInitializeAsRejected(reader: ReadableStreamReader<any>, reason: any) {\n  defaultReaderClosedPromiseInitialize(reader);\n  defaultReaderClosedPromiseReject(reader, reason);\n}\n\nexport function defaultReaderClosedPromiseInitializeAsResolved(reader: ReadableStreamReader<any>) {\n  defaultReaderClosedPromiseInitialize(reader);\n  defaultReaderClosedPromiseResolve(reader);\n}\n\nexport function defaultReaderClosedPromiseReject(reader: ReadableStreamReader<any>, reason: any) {\n  if (reader._closedPromise_reject === undefined) {\n    return;\n  }\n\n  setPromiseIsHandledToTrue(reader._closedPromise);\n  reader._closedPromise_reject(reason);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n\nexport function defaultReaderClosedPromiseResetToRejected(reader: ReadableStreamReader<any>, reason: any) {\n  assert(reader._closedPromise_resolve === undefined);\n  assert(reader._closedPromise_reject === undefined);\n\n  defaultReaderClosedPromiseInitializeAsRejected(reader, reason);\n}\n\nexport function defaultReaderClosedPromiseResolve(reader: ReadableStreamReader<any>) {\n  if (reader._closedPromise_resolve === undefined) {\n    return;\n  }\n\n  reader._closedPromise_resolve(undefined);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n","export const AbortSteps = Symbol('[[AbortSteps]]');\nexport const ErrorSteps = Symbol('[[ErrorSteps]]');\nexport const CancelSteps = Symbol('[[CancelSteps]]');\nexport const PullSteps = Symbol('[[PullSteps]]');\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite#Polyfill\nconst NumberIsFinite: typeof Number.isFinite = Number.isFinite || function (x) {\n  return typeof x === 'number' && isFinite(x);\n};\n\nexport default NumberIsFinite;\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc#Polyfill\nconst MathTrunc: typeof Math.trunc = Math.trunc || function (v) {\n  return v < 0 ? Math.ceil(v) : Math.floor(v);\n};\n\nexport default MathTrunc;\n","import NumberIsFinite from '../../stub/number-isfinite';\nimport MathTrunc from '../../stub/math-trunc';\n\n// https://heycam.github.io/webidl/#idl-dictionaries\nexport function isDictionary(x: any): x is object | null {\n  return typeof x === 'object' || typeof x === 'function';\n}\n\nexport function assertDictionary(obj: unknown,\n                                 context: string): asserts obj is object | null | undefined {\n  if (obj !== undefined && !isDictionary(obj)) {\n    throw new TypeError(`${context} is not an object.`);\n  }\n}\n\nexport type AnyFunction = (...args: any[]) => any;\n\n// https://heycam.github.io/webidl/#idl-callback-functions\nexport function assertFunction(x: unknown, context: string): asserts x is AnyFunction {\n  if (typeof x !== 'function') {\n    throw new TypeError(`${context} is not a function.`);\n  }\n}\n\n// https://heycam.github.io/webidl/#idl-object\nexport function isObject(x: any): x is object {\n  return (typeof x === 'object' && x !== null) || typeof x === 'function';\n}\n\nexport function assertObject(x: unknown,\n                             context: string): asserts x is object {\n  if (!isObject(x)) {\n    throw new TypeError(`${context} is not an object.`);\n  }\n}\n\nexport function assertRequiredArgument<T extends any>(x: T | undefined,\n                                                      position: number,\n                                                      context: string): asserts x is T {\n  if (x === undefined) {\n    throw new TypeError(`Parameter ${position} is required in '${context}'.`);\n  }\n}\n\nexport function assertRequiredField<T extends any>(x: T | undefined,\n                                                   field: string,\n                                                   context: string): asserts x is T {\n  if (x === undefined) {\n    throw new TypeError(`${field} is required in '${context}'.`);\n  }\n}\n\n// https://heycam.github.io/webidl/#idl-unrestricted-double\nexport function convertUnrestrictedDouble(value: unknown): number {\n  return Number(value);\n}\n\nfunction censorNegativeZero(x: number): number {\n  return x === 0 ? 0 : x;\n}\n\nfunction integerPart(x: number): number {\n  return censorNegativeZero(MathTrunc(x));\n}\n\n// https://heycam.github.io/webidl/#idl-unsigned-long-long\nexport function convertUnsignedLongLongWithEnforceRange(value: unknown, context: string): number {\n  const lowerBound = 0;\n  const upperBound = Number.MAX_SAFE_INTEGER;\n\n  let x = Number(value);\n  x = censorNegativeZero(x);\n\n  if (!NumberIsFinite(x)) {\n    throw new TypeError(`${context} is not a finite number`);\n  }\n\n  x = integerPart(x);\n\n  if (x < lowerBound || x > upperBound) {\n    throw new TypeError(`${context} is outside the accepted range of ${lowerBound} to ${upperBound}, inclusive`);\n  }\n\n  if (!NumberIsFinite(x) || x === 0) {\n    return 0;\n  }\n\n  // TODO Use BigInt if supported?\n  // let xBigInt = BigInt(integerPart(x));\n  // xBigInt = BigInt.asUintN(64, xBigInt);\n  // return Number(xBigInt);\n\n  return x;\n}\n","import { IsReadableStream, ReadableStream } from '../readable-stream';\n\nexport function assertReadableStream(x: unknown, context: string): asserts x is ReadableStream {\n  if (!IsReadableStream(x)) {\n    throw new TypeError(`${context} is not a ReadableStream.`);\n  }\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericInitialize,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport { IsReadableStreamLocked, ReadableStream } from '../readable-stream';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { PullSteps } from '../abstract-ops/internal-methods';\nimport { newPromise, promiseRejectedWith } from '../helpers/webidl';\nimport { assertRequiredArgument } from '../validators/basic';\nimport { assertReadableStream } from '../validators/readable-stream';\n\n/**\n * A result returned by {@link ReadableStreamDefaultReader.read}.\n *\n * @public\n */\nexport type ReadableStreamDefaultReadResult<T> = {\n  done: false;\n  value: T;\n} | {\n  done: true;\n  value?: undefined;\n}\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamDefaultReader<R>(stream: ReadableStream): ReadableStreamDefaultReader<R> {\n  return new ReadableStreamDefaultReader(stream);\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamAddReadRequest<R>(stream: ReadableStream<R>,\n                                                readRequest: ReadRequest<R>): void {\n  assert(IsReadableStreamDefaultReader(stream._reader));\n  assert(stream._state === 'readable');\n\n  (stream._reader! as ReadableStreamDefaultReader<R>)._readRequests.push(readRequest);\n}\n\nexport function ReadableStreamFulfillReadRequest<R>(stream: ReadableStream<R>, chunk: R | undefined, done: boolean) {\n  const reader = stream._reader as ReadableStreamDefaultReader<R>;\n\n  assert(reader._readRequests.length > 0);\n\n  const readRequest = reader._readRequests.shift()!;\n  if (done) {\n    readRequest._closeSteps();\n  } else {\n    readRequest._chunkSteps(chunk!);\n  }\n}\n\nexport function ReadableStreamGetNumReadRequests<R>(stream: ReadableStream<R>): number {\n  return (stream._reader as ReadableStreamDefaultReader<R>)._readRequests.length;\n}\n\nexport function ReadableStreamHasDefaultReader(stream: ReadableStream): boolean {\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return false;\n  }\n\n  if (!IsReadableStreamDefaultReader(reader)) {\n    return false;\n  }\n\n  return true;\n}\n\n// Readers\n\nexport interface ReadRequest<R> {\n  _chunkSteps(chunk: R): void;\n\n  _closeSteps(): void;\n\n  _errorSteps(e: any): void;\n}\n\n/**\n * A default reader vended by a {@link ReadableStream}.\n *\n * @public\n */\nexport class ReadableStreamDefaultReader<R = any> {\n  /** @internal */\n  _ownerReadableStream!: ReadableStream<R>;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readRequests: SimpleQueue<ReadRequest<R>>;\n\n  constructor(stream: ReadableStream<R>) {\n    assertRequiredArgument(stream, 1, 'ReadableStreamDefaultReader');\n    assertReadableStream(stream, 'First parameter');\n\n    if (IsReadableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n    }\n\n    ReadableStreamReaderGenericInitialize(this, stream);\n\n    this._readRequests = new SimpleQueue();\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed,\n   * or rejected if the stream ever errors or the reader's lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('cancel'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('cancel'));\n    }\n\n    return ReadableStreamReaderGenericCancel(this, reason);\n  }\n\n  /**\n   * Returns a promise that allows access to the next chunk from the stream's internal queue, if available.\n   *\n   * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.\n   */\n  read(): Promise<ReadableStreamDefaultReadResult<R>> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('read'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('read from'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamDefaultReadResult<R>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamDefaultReadResult<R>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),\n      _closeSteps: () => resolvePromise({ value: undefined, done: true }),\n      _errorSteps: e => rejectPromise(e)\n    };\n    ReadableStreamDefaultReaderRead(this, readRequest);\n    return promise;\n  }\n\n  /**\n   * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.\n   * If the associated stream is errored when the lock is released, the reader will appear errored in the same way\n   * from now on; otherwise, the reader will appear closed.\n   *\n   * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by\n   * the reader's {@link ReadableStreamDefaultReader.read | read()} method has not yet been settled. Attempting to\n   * do so will throw a `TypeError` and leave the reader locked to the stream.\n   */\n  releaseLock(): void {\n    if (!IsReadableStreamDefaultReader(this)) {\n      throw defaultReaderBrandCheckException('releaseLock');\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return;\n    }\n\n    if (this._readRequests.length > 0) {\n      throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n    }\n\n    ReadableStreamReaderGenericRelease(this);\n  }\n}\n\nObject.defineProperties(ReadableStreamDefaultReader.prototype, {\n  cancel: { enumerable: true },\n  read: { enumerable: true },\n  releaseLock: { enumerable: true },\n  closed: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamDefaultReader.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamDefaultReader',\n    configurable: true\n  });\n}\n\n// Abstract operations for the readers.\n\nexport function IsReadableStreamDefaultReader<R = any>(x: any): x is ReadableStreamDefaultReader<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readRequests')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamDefaultReader;\n}\n\nexport function ReadableStreamDefaultReaderRead<R>(reader: ReadableStreamDefaultReader<R>,\n                                                   readRequest: ReadRequest<R>): void {\n  const stream = reader._ownerReadableStream;\n\n  assert(stream !== undefined);\n\n  stream._disturbed = true;\n\n  if (stream._state === 'closed') {\n    readRequest._closeSteps();\n  } else if (stream._state === 'errored') {\n    readRequest._errorSteps(stream._storedError);\n  } else {\n    assert(stream._state === 'readable');\n    stream._readableStreamController[PullSteps](readRequest as ReadRequest<any>);\n  }\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nfunction defaultReaderBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamDefaultReader.prototype.${name} can only be used on a ReadableStreamDefaultReader`);\n}\n","/// <reference lib=\"es2018.asynciterable\" />\n\nexport let AsyncIteratorPrototype: AsyncIterable<any> | undefined;\n\nif (typeof Symbol.asyncIterator === 'symbol') {\n  // We're running inside a ES2018+ environment, but we're compiling to an older syntax.\n  // We cannot access %AsyncIteratorPrototype% without non-ES2018 syntax, but we can re-create it.\n  AsyncIteratorPrototype = {\n    // 25.1.3.1 %AsyncIteratorPrototype% [ @@asyncIterator ] ( )\n    // https://tc39.github.io/ecma262/#sec-asynciteratorprototype-asynciterator\n    [Symbol.asyncIterator](this: AsyncIterator<any>) {\n      return this;\n    }\n  };\n  Object.defineProperty(AsyncIteratorPrototype, Symbol.asyncIterator, { enumerable: false });\n}\n","/// <reference lib=\"es2018.asynciterable\" />\n\nimport { ReadableStream } from '../readable-stream';\nimport {\n  AcquireReadableStreamDefaultReader,\n  ReadableStreamDefaultReader,\n  ReadableStreamDefaultReaderRead,\n  ReadableStreamDefaultReadResult,\n  ReadRequest\n} from './default-reader';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport assert from '../../stub/assert';\nimport { AsyncIteratorPrototype } from '@@target/stub/async-iterator-prototype';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport {\n  newPromise,\n  promiseRejectedWith,\n  promiseResolvedWith,\n  queueMicrotask,\n  transformPromiseWith\n} from '../helpers/webidl';\n\n/**\n * An async iterator returned by {@link ReadableStream.values}.\n *\n * @public\n */\nexport interface ReadableStreamAsyncIterator<R> extends AsyncIterator<R> {\n  next(): Promise<IteratorResult<R, undefined>>;\n\n  return(value?: any): Promise<IteratorResult<any>>;\n}\n\nexport class ReadableStreamAsyncIteratorImpl<R> {\n  private readonly _reader: ReadableStreamDefaultReader<R>;\n  private readonly _preventCancel: boolean;\n  private _ongoingPromise: Promise<ReadableStreamDefaultReadResult<R>> | undefined = undefined;\n  private _isFinished = false;\n\n  constructor(reader: ReadableStreamDefaultReader<R>, preventCancel: boolean) {\n    this._reader = reader;\n    this._preventCancel = preventCancel;\n  }\n\n  next(): Promise<ReadableStreamDefaultReadResult<R>> {\n    const nextSteps = () => this._nextSteps();\n    this._ongoingPromise = this._ongoingPromise ?\n      transformPromiseWith(this._ongoingPromise, nextSteps, nextSteps) :\n      nextSteps();\n    return this._ongoingPromise;\n  }\n\n  return(value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    const returnSteps = () => this._returnSteps(value);\n    return this._ongoingPromise ?\n      transformPromiseWith(this._ongoingPromise, returnSteps, returnSteps) :\n      returnSteps();\n  }\n\n  private _nextSteps(): Promise<ReadableStreamDefaultReadResult<R>> {\n    if (this._isFinished) {\n      return Promise.resolve({ value: undefined, done: true });\n    }\n\n    const reader = this._reader;\n    if (reader._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('iterate'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamDefaultReadResult<R>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamDefaultReadResult<R>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => {\n        this._ongoingPromise = undefined;\n        // This needs to be delayed by one microtask, otherwise we stop pulling too early which breaks a test.\n        // FIXME Is this a bug in the specification, or in the test?\n        queueMicrotask(() => resolvePromise({ value: chunk, done: false }));\n      },\n      _closeSteps: () => {\n        this._ongoingPromise = undefined;\n        this._isFinished = true;\n        ReadableStreamReaderGenericRelease(reader);\n        resolvePromise({ value: undefined, done: true });\n      },\n      _errorSteps: reason => {\n        this._ongoingPromise = undefined;\n        this._isFinished = true;\n        ReadableStreamReaderGenericRelease(reader);\n        rejectPromise(reason);\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n    return promise;\n  }\n\n  private _returnSteps(value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (this._isFinished) {\n      return Promise.resolve({ value, done: true });\n    }\n    this._isFinished = true;\n\n    const reader = this._reader;\n    if (reader._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('finish iterating'));\n    }\n\n    assert(reader._readRequests.length === 0);\n\n    if (!this._preventCancel) {\n      const result = ReadableStreamReaderGenericCancel(reader, value);\n      ReadableStreamReaderGenericRelease(reader);\n      return transformPromiseWith(result, () => ({ value, done: true }));\n    }\n\n    ReadableStreamReaderGenericRelease(reader);\n    return promiseResolvedWith({ value, done: true });\n  }\n}\n\ndeclare class ReadableStreamAsyncIteratorInstance<R> implements ReadableStreamAsyncIterator<R> {\n  /** @interal */\n  _asyncIteratorImpl: ReadableStreamAsyncIteratorImpl<R>;\n\n  next(): Promise<IteratorResult<R, undefined>>;\n\n  return(value?: any): Promise<IteratorResult<any>>;\n}\n\nconst ReadableStreamAsyncIteratorPrototype: ReadableStreamAsyncIteratorInstance<any> = {\n  next(this: ReadableStreamAsyncIteratorInstance<any>): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (!IsReadableStreamAsyncIterator(this)) {\n      return promiseRejectedWith(streamAsyncIteratorBrandCheckException('next'));\n    }\n    return this._asyncIteratorImpl.next();\n  },\n\n  return(this: ReadableStreamAsyncIteratorInstance<any>, value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (!IsReadableStreamAsyncIterator(this)) {\n      return promiseRejectedWith(streamAsyncIteratorBrandCheckException('return'));\n    }\n    return this._asyncIteratorImpl.return(value);\n  }\n} as any;\nif (AsyncIteratorPrototype !== undefined) {\n  Object.setPrototypeOf(ReadableStreamAsyncIteratorPrototype, AsyncIteratorPrototype);\n}\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamAsyncIterator<R>(stream: ReadableStream<R>,\n                                                      preventCancel: boolean): ReadableStreamAsyncIterator<R> {\n  const reader = AcquireReadableStreamDefaultReader<R>(stream);\n  const impl = new ReadableStreamAsyncIteratorImpl(reader, preventCancel);\n  const iterator: ReadableStreamAsyncIteratorInstance<R> = Object.create(ReadableStreamAsyncIteratorPrototype);\n  iterator._asyncIteratorImpl = impl;\n  return iterator;\n}\n\nfunction IsReadableStreamAsyncIterator<R = any>(x: any): x is ReadableStreamAsyncIterator<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_asyncIteratorImpl')) {\n    return false;\n  }\n\n  try {\n    // noinspection SuspiciousTypeOfGuard\n    return (x as ReadableStreamAsyncIteratorInstance<any>)._asyncIteratorImpl instanceof\n      ReadableStreamAsyncIteratorImpl;\n  } catch {\n    return false;\n  }\n}\n\n// Helper functions for the ReadableStream.\n\nfunction streamAsyncIteratorBrandCheckException(name: string): TypeError {\n  return new TypeError(`ReadableStreamAsyncIterator.${name} can only be used on a ReadableSteamAsyncIterator`);\n}\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Polyfill\nconst NumberIsNaN: typeof Number.isNaN = Number.isNaN || function (x) {\n  // eslint-disable-next-line no-self-compare\n  return x !== x;\n};\n\nexport default NumberIsNaN;\n","export function CreateArrayFromList<T extends any[]>(elements: T): T {\n  // We use arrays to represent lists, so this is basically a no-op.\n  // Do a slice though just in case we happen to depend on the unique-ness.\n  return elements.slice() as T;\n}\n\nexport function CopyDataBlockBytes(dest: ArrayBuffer,\n                                   destOffset: number,\n                                   src: ArrayBuffer,\n                                   srcOffset: number,\n                                   n: number) {\n  new Uint8Array(dest).set(new Uint8Array(src, srcOffset, n), destOffset);\n}\n\n// Not implemented correctly\nexport function TransferArrayBuffer<T extends ArrayBufferLike>(O: T): T {\n  return O;\n}\n\n// Not implemented correctly\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nexport function CanTransferArrayBuffer(O: ArrayBufferLike): boolean {\n  return true;\n}\n\n// Not implemented correctly\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nexport function IsDetachedBuffer(O: ArrayBufferLike): boolean {\n  return false;\n}\n\nexport function ArrayBufferSlice(buffer: ArrayBufferLike, begin: number, end: number): ArrayBufferLike {\n  // ArrayBuffer.prototype.slice is not available on IE10\n  // https://www.caniuse.com/mdn-javascript_builtins_arraybuffer_slice\n  if (buffer.slice) {\n    return buffer.slice(begin, end);\n  }\n  const length = end - begin;\n  const slice = new ArrayBuffer(length);\n  CopyDataBlockBytes(slice, 0, buffer, begin, length);\n  return slice;\n}\n","import NumberIsNaN from '../../stub/number-isnan';\nimport { ArrayBufferSlice } from './ecmascript';\n\nexport function IsNonNegativeNumber(v: number): boolean {\n  if (typeof v !== 'number') {\n    return false;\n  }\n\n  if (NumberIsNaN(v)) {\n    return false;\n  }\n\n  if (v < 0) {\n    return false;\n  }\n\n  return true;\n}\n\nexport function CloneAsUint8Array(O: ArrayBufferView): Uint8Array {\n  const buffer = ArrayBufferSlice(O.buffer, O.byteOffset, O.byteOffset + O.byteLength);\n  return new Uint8Array(buffer);\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport { IsNonNegativeNumber } from './miscellaneous';\n\nexport interface QueueContainer<T> {\n  _queue: SimpleQueue<T>;\n  _queueTotalSize: number;\n}\n\nexport interface QueuePair<T> {\n  value: T;\n  size: number;\n}\n\nexport function DequeueValue<T>(container: QueueContainer<QueuePair<T>>): T {\n  assert('_queue' in container && '_queueTotalSize' in container);\n  assert(container._queue.length > 0);\n\n  const pair = container._queue.shift()!;\n  container._queueTotalSize -= pair.size;\n  if (container._queueTotalSize < 0) {\n    container._queueTotalSize = 0;\n  }\n\n  return pair.value;\n}\n\nexport function EnqueueValueWithSize<T>(container: QueueContainer<QueuePair<T>>, value: T, size: number) {\n  assert('_queue' in container && '_queueTotalSize' in container);\n\n  if (!IsNonNegativeNumber(size) || size === Infinity) {\n    throw new RangeError('Size must be a finite, non-NaN, non-negative number.');\n  }\n\n  container._queue.push({ value, size });\n  container._queueTotalSize += size;\n}\n\nexport function PeekQueueValue<T>(container: QueueContainer<QueuePair<T>>): T {\n  assert('_queue' in container && '_queueTotalSize' in container);\n  assert(container._queue.length > 0);\n\n  const pair = container._queue.peek();\n  return pair.value;\n}\n\nexport function ResetQueue<T>(container: QueueContainer<T>) {\n  assert('_queue' in container && '_queueTotalSize' in container);\n\n  container._queue = new SimpleQueue<T>();\n  container._queueTotalSize = 0;\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport { ResetQueue } from '../abstract-ops/queue-with-sizes';\nimport {\n  ReadableStreamAddReadRequest,\n  ReadableStreamFulfillReadRequest,\n  ReadableStreamGetNumReadRequests,\n  ReadableStreamHasDefaultReader,\n  ReadRequest\n} from './default-reader';\nimport {\n  ReadableStreamAddReadIntoRequest,\n  ReadableStreamFulfillReadIntoRequest,\n  ReadableStreamGetNumReadIntoRequests,\n  ReadableStreamHasBYOBReader,\n  ReadIntoRequest\n} from './byob-reader';\nimport NumberIsInteger from '../../stub/number-isinteger';\nimport {\n  IsReadableStreamLocked,\n  ReadableByteStream,\n  ReadableStreamClose,\n  ReadableStreamError\n} from '../readable-stream';\nimport { ValidatedUnderlyingByteSource } from './underlying-source';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport {\n  ArrayBufferSlice,\n  CanTransferArrayBuffer,\n  CopyDataBlockBytes,\n  IsDetachedBuffer,\n  TransferArrayBuffer\n} from '../abstract-ops/ecmascript';\nimport { CancelSteps, PullSteps } from '../abstract-ops/internal-methods';\nimport { promiseResolvedWith, uponPromise } from '../helpers/webidl';\nimport { assertRequiredArgument, convertUnsignedLongLongWithEnforceRange } from '../validators/basic';\n\n/**\n * A pull-into request in a {@link ReadableByteStreamController}.\n *\n * @public\n */\nexport class ReadableStreamBYOBRequest {\n  /** @internal */\n  _associatedReadableByteStreamController!: ReadableByteStreamController;\n  /** @internal */\n  _view!: ArrayBufferView | null;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the view for writing in to, or `null` if the BYOB request has already been responded to.\n   */\n  get view(): ArrayBufferView | null {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('view');\n    }\n\n    return this._view;\n  }\n\n  /**\n   * Indicates to the associated readable byte stream that `bytesWritten` bytes were written into\n   * {@link ReadableStreamBYOBRequest.view | view}, causing the result be surfaced to the consumer.\n   *\n   * After this method is called, {@link ReadableStreamBYOBRequest.view | view} will be transferred and no longer\n   * modifiable.\n   */\n  respond(bytesWritten: number): void;\n  respond(bytesWritten: number | undefined): void {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('respond');\n    }\n    assertRequiredArgument(bytesWritten, 1, 'respond');\n    bytesWritten = convertUnsignedLongLongWithEnforceRange(bytesWritten, 'First parameter');\n\n    if (this._associatedReadableByteStreamController === undefined) {\n      throw new TypeError('This BYOB request has been invalidated');\n    }\n\n    if (IsDetachedBuffer(this._view!.buffer)) {\n      throw new TypeError(`The BYOB request's buffer has been detached and so cannot be used as a response`);\n    }\n\n    assert(this._view!.byteLength > 0);\n    assert(this._view!.buffer.byteLength > 0);\n\n    ReadableByteStreamControllerRespond(this._associatedReadableByteStreamController, bytesWritten);\n  }\n\n  /**\n   * Indicates to the associated readable byte stream that instead of writing into\n   * {@link ReadableStreamBYOBRequest.view | view}, the underlying byte source is providing a new `ArrayBufferView`,\n   * which will be given to the consumer of the readable byte stream.\n   *\n   * After this method is called, `view` will be transferred and no longer modifiable.\n   */\n  respondWithNewView(view: ArrayBufferView): void;\n  respondWithNewView(view: ArrayBufferView | undefined): void {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('respondWithNewView');\n    }\n    assertRequiredArgument(view, 1, 'respondWithNewView');\n\n    if (!ArrayBuffer.isView(view)) {\n      throw new TypeError('You can only respond with array buffer views');\n    }\n\n    if (this._associatedReadableByteStreamController === undefined) {\n      throw new TypeError('This BYOB request has been invalidated');\n    }\n\n    if (IsDetachedBuffer(view.buffer)) {\n      throw new TypeError('The given view\\'s buffer has been detached and so cannot be used as a response');\n    }\n\n    ReadableByteStreamControllerRespondWithNewView(this._associatedReadableByteStreamController, view);\n  }\n}\n\nObject.defineProperties(ReadableStreamBYOBRequest.prototype, {\n  respond: { enumerable: true },\n  respondWithNewView: { enumerable: true },\n  view: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamBYOBRequest.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamBYOBRequest',\n    configurable: true\n  });\n}\n\ninterface ArrayBufferViewConstructor<T extends ArrayBufferView = ArrayBufferView> {\n  new(buffer: ArrayBufferLike, byteOffset: number, length?: number): T;\n\n  readonly prototype: T;\n  readonly BYTES_PER_ELEMENT: number;\n}\n\ninterface ByteQueueElement {\n  buffer: ArrayBufferLike;\n  byteOffset: number;\n  byteLength: number;\n}\n\ntype PullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> =\n  DefaultPullIntoDescriptor\n  | BYOBPullIntoDescriptor<T>;\n\ninterface DefaultPullIntoDescriptor {\n  buffer: ArrayBufferLike;\n  bufferByteLength: number;\n  byteOffset: number;\n  byteLength: number;\n  bytesFilled: number;\n  elementSize: number;\n  viewConstructor: ArrayBufferViewConstructor<Uint8Array>;\n  readerType: 'default';\n}\n\ninterface BYOBPullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> {\n  buffer: ArrayBufferLike;\n  bufferByteLength: number;\n  byteOffset: number;\n  byteLength: number;\n  bytesFilled: number;\n  elementSize: number;\n  viewConstructor: ArrayBufferViewConstructor<T>;\n  readerType: 'byob';\n}\n\n/**\n * Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue.\n *\n * @public\n */\nexport class ReadableByteStreamController {\n  /** @internal */\n  _controlledReadableByteStream!: ReadableByteStream;\n  /** @internal */\n  _queue!: SimpleQueue<ByteQueueElement>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _closeRequested!: boolean;\n  /** @internal */\n  _pullAgain!: boolean;\n  /** @internal */\n  _pulling !: boolean;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _pullAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _cancelAlgorithm!: (reason: any) => Promise<void>;\n  /** @internal */\n  _autoAllocateChunkSize: number | undefined;\n  /** @internal */\n  _byobRequest: ReadableStreamBYOBRequest | null;\n  /** @internal */\n  _pendingPullIntos!: SimpleQueue<PullIntoDescriptor>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the current BYOB pull request, or `null` if there isn't one.\n   */\n  get byobRequest(): ReadableStreamBYOBRequest | null {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('byobRequest');\n    }\n\n    return ReadableByteStreamControllerGetBYOBRequest(this);\n  }\n\n  /**\n   * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is\n   * over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure.\n   */\n  get desiredSize(): number | null {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('desiredSize');\n    }\n\n    return ReadableByteStreamControllerGetDesiredSize(this);\n  }\n\n  /**\n   * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from\n   * the stream, but once those are read, the stream will become closed.\n   */\n  close(): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('close');\n    }\n\n    if (this._closeRequested) {\n      throw new TypeError('The stream has already been closed; do not close it again!');\n    }\n\n    const state = this._controlledReadableByteStream._state;\n    if (state !== 'readable') {\n      throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be closed`);\n    }\n\n    ReadableByteStreamControllerClose(this);\n  }\n\n  /**\n   * Enqueues the given chunk chunk in the controlled readable stream.\n   * The chunk has to be an `ArrayBufferView` instance, or else a `TypeError` will be thrown.\n   */\n  enqueue(chunk: ArrayBufferView): void;\n  enqueue(chunk: ArrayBufferView | undefined): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('enqueue');\n    }\n\n    assertRequiredArgument(chunk, 1, 'enqueue');\n    if (!ArrayBuffer.isView(chunk)) {\n      throw new TypeError('chunk must be an array buffer view');\n    }\n    if (chunk.byteLength === 0) {\n      throw new TypeError('chunk must have non-zero byteLength');\n    }\n    if (chunk.buffer.byteLength === 0) {\n      throw new TypeError(`chunk's buffer must have non-zero byteLength`);\n    }\n\n    if (this._closeRequested) {\n      throw new TypeError('stream is closed or draining');\n    }\n\n    const state = this._controlledReadableByteStream._state;\n    if (state !== 'readable') {\n      throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be enqueued to`);\n    }\n\n    ReadableByteStreamControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.\n   */\n  error(e: any = undefined): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('error');\n    }\n\n    ReadableByteStreamControllerError(this, e);\n  }\n\n  /** @internal */\n  [CancelSteps](reason: any): Promise<void> {\n    ReadableByteStreamControllerClearPendingPullIntos(this);\n\n    ResetQueue(this);\n\n    const result = this._cancelAlgorithm(reason);\n    ReadableByteStreamControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [PullSteps](readRequest: ReadRequest<Uint8Array>): void {\n    const stream = this._controlledReadableByteStream;\n    assert(ReadableStreamHasDefaultReader(stream));\n\n    if (this._queueTotalSize > 0) {\n      assert(ReadableStreamGetNumReadRequests(stream) === 0);\n\n      const entry = this._queue.shift()!;\n      this._queueTotalSize -= entry.byteLength;\n\n      ReadableByteStreamControllerHandleQueueDrain(this);\n\n      const view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);\n\n      readRequest._chunkSteps(view);\n      return;\n    }\n\n    const autoAllocateChunkSize = this._autoAllocateChunkSize;\n    if (autoAllocateChunkSize !== undefined) {\n      let buffer: ArrayBuffer;\n      try {\n        buffer = new ArrayBuffer(autoAllocateChunkSize);\n      } catch (bufferE) {\n        readRequest._errorSteps(bufferE);\n        return;\n      }\n\n      const pullIntoDescriptor: DefaultPullIntoDescriptor = {\n        buffer,\n        bufferByteLength: autoAllocateChunkSize,\n        byteOffset: 0,\n        byteLength: autoAllocateChunkSize,\n        bytesFilled: 0,\n        elementSize: 1,\n        viewConstructor: Uint8Array,\n        readerType: 'default'\n      };\n\n      this._pendingPullIntos.push(pullIntoDescriptor);\n    }\n\n    ReadableStreamAddReadRequest(stream, readRequest);\n    ReadableByteStreamControllerCallPullIfNeeded(this);\n  }\n}\n\nObject.defineProperties(ReadableByteStreamController.prototype, {\n  close: { enumerable: true },\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  byobRequest: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableByteStreamController.prototype, Symbol.toStringTag, {\n    value: 'ReadableByteStreamController',\n    configurable: true\n  });\n}\n\n// Abstract operations for the ReadableByteStreamController.\n\nexport function IsReadableByteStreamController(x: any): x is ReadableByteStreamController {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableByteStream')) {\n    return false;\n  }\n\n  return x instanceof ReadableByteStreamController;\n}\n\nfunction IsReadableStreamBYOBRequest(x: any): x is ReadableStreamBYOBRequest {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_associatedReadableByteStreamController')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamBYOBRequest;\n}\n\nfunction ReadableByteStreamControllerCallPullIfNeeded(controller: ReadableByteStreamController): void {\n  const shouldPull = ReadableByteStreamControllerShouldCallPull(controller);\n  if (!shouldPull) {\n    return;\n  }\n\n  if (controller._pulling) {\n    controller._pullAgain = true;\n    return;\n  }\n\n  assert(!controller._pullAgain);\n\n  controller._pulling = true;\n\n  // TODO: Test controller argument\n  const pullPromise = controller._pullAlgorithm();\n  uponPromise(\n    pullPromise,\n    () => {\n      controller._pulling = false;\n\n      if (controller._pullAgain) {\n        controller._pullAgain = false;\n        ReadableByteStreamControllerCallPullIfNeeded(controller);\n      }\n    },\n    e => {\n      ReadableByteStreamControllerError(controller, e);\n    }\n  );\n}\n\nfunction ReadableByteStreamControllerClearPendingPullIntos(controller: ReadableByteStreamController) {\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n  controller._pendingPullIntos = new SimpleQueue();\n}\n\nfunction ReadableByteStreamControllerCommitPullIntoDescriptor<T extends ArrayBufferView>(\n  stream: ReadableByteStream,\n  pullIntoDescriptor: PullIntoDescriptor<T>\n) {\n  assert(stream._state !== 'errored');\n\n  let done = false;\n  if (stream._state === 'closed') {\n    assert(pullIntoDescriptor.bytesFilled === 0);\n    done = true;\n  }\n\n  const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);\n  if (pullIntoDescriptor.readerType === 'default') {\n    ReadableStreamFulfillReadRequest(stream, filledView as unknown as Uint8Array, done);\n  } else {\n    assert(pullIntoDescriptor.readerType === 'byob');\n    ReadableStreamFulfillReadIntoRequest(stream, filledView, done);\n  }\n}\n\nfunction ReadableByteStreamControllerConvertPullIntoDescriptor<T extends ArrayBufferView>(\n  pullIntoDescriptor: PullIntoDescriptor<T>\n): T {\n  const bytesFilled = pullIntoDescriptor.bytesFilled;\n  const elementSize = pullIntoDescriptor.elementSize;\n\n  assert(bytesFilled <= pullIntoDescriptor.byteLength);\n  assert(bytesFilled % elementSize === 0);\n\n  return new pullIntoDescriptor.viewConstructor(\n    pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize) as T;\n}\n\nfunction ReadableByteStreamControllerEnqueueChunkToQueue(controller: ReadableByteStreamController,\n                                                         buffer: ArrayBufferLike,\n                                                         byteOffset: number,\n                                                         byteLength: number) {\n  controller._queue.push({ buffer, byteOffset, byteLength });\n  controller._queueTotalSize += byteLength;\n}\n\nfunction ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller: ReadableByteStreamController,\n                                                                     pullIntoDescriptor: PullIntoDescriptor) {\n  const elementSize = pullIntoDescriptor.elementSize;\n\n  const currentAlignedBytes = pullIntoDescriptor.bytesFilled - pullIntoDescriptor.bytesFilled % elementSize;\n\n  const maxBytesToCopy = Math.min(controller._queueTotalSize,\n                                  pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled);\n  const maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;\n  const maxAlignedBytes = maxBytesFilled - maxBytesFilled % elementSize;\n\n  let totalBytesToCopyRemaining = maxBytesToCopy;\n  let ready = false;\n  if (maxAlignedBytes > currentAlignedBytes) {\n    totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled;\n    ready = true;\n  }\n\n  const queue = controller._queue;\n\n  while (totalBytesToCopyRemaining > 0) {\n    const headOfQueue = queue.peek();\n\n    const bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength);\n\n    const destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n    CopyDataBlockBytes(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy);\n\n    if (headOfQueue.byteLength === bytesToCopy) {\n      queue.shift();\n    } else {\n      headOfQueue.byteOffset += bytesToCopy;\n      headOfQueue.byteLength -= bytesToCopy;\n    }\n    controller._queueTotalSize -= bytesToCopy;\n\n    ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor);\n\n    totalBytesToCopyRemaining -= bytesToCopy;\n  }\n\n  if (!ready) {\n    assert(controller._queueTotalSize === 0);\n    assert(pullIntoDescriptor.bytesFilled > 0);\n    assert(pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize);\n  }\n\n  return ready;\n}\n\nfunction ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller: ReadableByteStreamController,\n                                                                size: number,\n                                                                pullIntoDescriptor: PullIntoDescriptor) {\n  assert(controller._pendingPullIntos.length === 0 || controller._pendingPullIntos.peek() === pullIntoDescriptor);\n  assert(controller._byobRequest === null);\n  pullIntoDescriptor.bytesFilled += size;\n}\n\nfunction ReadableByteStreamControllerHandleQueueDrain(controller: ReadableByteStreamController) {\n  assert(controller._controlledReadableByteStream._state === 'readable');\n\n  if (controller._queueTotalSize === 0 && controller._closeRequested) {\n    ReadableByteStreamControllerClearAlgorithms(controller);\n    ReadableStreamClose(controller._controlledReadableByteStream);\n  } else {\n    ReadableByteStreamControllerCallPullIfNeeded(controller);\n  }\n}\n\nfunction ReadableByteStreamControllerInvalidateBYOBRequest(controller: ReadableByteStreamController) {\n  if (controller._byobRequest === null) {\n    return;\n  }\n\n  controller._byobRequest._associatedReadableByteStreamController = undefined!;\n  controller._byobRequest._view = null!;\n  controller._byobRequest = null;\n}\n\nfunction ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller: ReadableByteStreamController) {\n  assert(!controller._closeRequested);\n\n  while (controller._pendingPullIntos.length > 0) {\n    if (controller._queueTotalSize === 0) {\n      return;\n    }\n\n    const pullIntoDescriptor = controller._pendingPullIntos.peek();\n\n    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {\n      ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n      ReadableByteStreamControllerCommitPullIntoDescriptor(\n        controller._controlledReadableByteStream,\n        pullIntoDescriptor\n      );\n    }\n  }\n}\n\nexport function ReadableByteStreamControllerPullInto<T extends ArrayBufferView>(\n  controller: ReadableByteStreamController,\n  view: T,\n  readIntoRequest: ReadIntoRequest<T>\n): void {\n  const stream = controller._controlledReadableByteStream;\n\n  let elementSize = 1;\n  if (view.constructor !== DataView) {\n    elementSize = (view.constructor as ArrayBufferViewConstructor<T>).BYTES_PER_ELEMENT;\n  }\n\n  const ctor = view.constructor as ArrayBufferViewConstructor<T>;\n\n  // try {\n  const buffer = TransferArrayBuffer(view.buffer);\n  // } catch (e) {\n  //   readIntoRequest._errorSteps(e);\n  //   return;\n  // }\n\n  const pullIntoDescriptor: BYOBPullIntoDescriptor<T> = {\n    buffer,\n    bufferByteLength: buffer.byteLength,\n    byteOffset: view.byteOffset,\n    byteLength: view.byteLength,\n    bytesFilled: 0,\n    elementSize,\n    viewConstructor: ctor,\n    readerType: 'byob'\n  };\n\n  if (controller._pendingPullIntos.length > 0) {\n    controller._pendingPullIntos.push(pullIntoDescriptor);\n\n    // No ReadableByteStreamControllerCallPullIfNeeded() call since:\n    // - No change happens on desiredSize\n    // - The source has already been notified of that there's at least 1 pending read(view)\n\n    ReadableStreamAddReadIntoRequest(stream, readIntoRequest);\n    return;\n  }\n\n  if (stream._state === 'closed') {\n    const emptyView = new ctor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0);\n    readIntoRequest._closeSteps(emptyView);\n    return;\n  }\n\n  if (controller._queueTotalSize > 0) {\n    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {\n      const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);\n\n      ReadableByteStreamControllerHandleQueueDrain(controller);\n\n      readIntoRequest._chunkSteps(filledView);\n      return;\n    }\n\n    if (controller._closeRequested) {\n      const e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n      ReadableByteStreamControllerError(controller, e);\n\n      readIntoRequest._errorSteps(e);\n      return;\n    }\n  }\n\n  controller._pendingPullIntos.push(pullIntoDescriptor);\n\n  ReadableStreamAddReadIntoRequest<T>(stream, readIntoRequest);\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nfunction ReadableByteStreamControllerRespondInClosedState(controller: ReadableByteStreamController,\n                                                          firstDescriptor: PullIntoDescriptor) {\n  assert(firstDescriptor.bytesFilled === 0);\n\n  const stream = controller._controlledReadableByteStream;\n  if (ReadableStreamHasBYOBReader(stream)) {\n    while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n      const pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);\n      ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);\n    }\n  }\n}\n\nfunction ReadableByteStreamControllerRespondInReadableState(controller: ReadableByteStreamController,\n                                                            bytesWritten: number,\n                                                            pullIntoDescriptor: PullIntoDescriptor) {\n  assert(pullIntoDescriptor.bytesFilled + bytesWritten <= pullIntoDescriptor.byteLength);\n\n  ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor);\n\n  if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {\n    return;\n  }\n\n  ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n  const remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize;\n  if (remainderSize > 0) {\n    const end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n    const remainder = ArrayBufferSlice(pullIntoDescriptor.buffer, end - remainderSize, end);\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength);\n  }\n\n  pullIntoDescriptor.bytesFilled -= remainderSize;\n  ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);\n\n  ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n}\n\nfunction ReadableByteStreamControllerRespondInternal(controller: ReadableByteStreamController, bytesWritten: number) {\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  assert(CanTransferArrayBuffer(firstDescriptor.buffer));\n\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n\n  const state = controller._controlledReadableByteStream._state;\n  if (state === 'closed') {\n    assert(bytesWritten === 0);\n    ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor);\n  } else {\n    assert(state === 'readable');\n    assert(bytesWritten > 0);\n    ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);\n  }\n\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nfunction ReadableByteStreamControllerShiftPendingPullInto(\n  controller: ReadableByteStreamController\n): PullIntoDescriptor {\n  assert(controller._byobRequest === null);\n  const descriptor = controller._pendingPullIntos.shift()!;\n  return descriptor;\n}\n\nfunction ReadableByteStreamControllerShouldCallPull(controller: ReadableByteStreamController): boolean {\n  const stream = controller._controlledReadableByteStream;\n\n  if (stream._state !== 'readable') {\n    return false;\n  }\n\n  if (controller._closeRequested) {\n    return false;\n  }\n\n  if (!controller._started) {\n    return false;\n  }\n\n  if (ReadableStreamHasDefaultReader(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    return true;\n  }\n\n  if (ReadableStreamHasBYOBReader(stream) && ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n    return true;\n  }\n\n  const desiredSize = ReadableByteStreamControllerGetDesiredSize(controller);\n  assert(desiredSize !== null);\n  if (desiredSize! > 0) {\n    return true;\n  }\n\n  return false;\n}\n\nfunction ReadableByteStreamControllerClearAlgorithms(controller: ReadableByteStreamController) {\n  controller._pullAlgorithm = undefined!;\n  controller._cancelAlgorithm = undefined!;\n}\n\n// A client of ReadableByteStreamController may use these functions directly to bypass state check.\n\nexport function ReadableByteStreamControllerClose(controller: ReadableByteStreamController) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (controller._closeRequested || stream._state !== 'readable') {\n    return;\n  }\n\n  if (controller._queueTotalSize > 0) {\n    controller._closeRequested = true;\n\n    return;\n  }\n\n  if (controller._pendingPullIntos.length > 0) {\n    const firstPendingPullInto = controller._pendingPullIntos.peek();\n    if (firstPendingPullInto.bytesFilled > 0) {\n      const e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n      ReadableByteStreamControllerError(controller, e);\n\n      throw e;\n    }\n  }\n\n  ReadableByteStreamControllerClearAlgorithms(controller);\n  ReadableStreamClose(stream);\n}\n\nexport function ReadableByteStreamControllerEnqueue(controller: ReadableByteStreamController, chunk: ArrayBufferView) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (controller._closeRequested || stream._state !== 'readable') {\n    return;\n  }\n\n  const buffer = chunk.buffer;\n  const byteOffset = chunk.byteOffset;\n  const byteLength = chunk.byteLength;\n  if (IsDetachedBuffer(buffer)) {\n    throw new TypeError('chunk\\'s buffer is detached and so cannot be enqueued');\n  }\n  const transferredBuffer = TransferArrayBuffer(buffer);\n\n  if (controller._pendingPullIntos.length > 0) {\n    const firstPendingPullInto = controller._pendingPullIntos.peek();\n    if (IsDetachedBuffer(firstPendingPullInto.buffer)) {\n      throw new TypeError(\n        'The BYOB request\\'s buffer has been detached and so cannot be filled with an enqueued chunk'\n      );\n    }\n    firstPendingPullInto.buffer = TransferArrayBuffer(firstPendingPullInto.buffer);\n  }\n\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n\n  if (ReadableStreamHasDefaultReader(stream)) {\n    if (ReadableStreamGetNumReadRequests(stream) === 0) {\n      assert(controller._pendingPullIntos.length === 0);\n      ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n    } else {\n      assert(controller._queue.length === 0);\n      if (controller._pendingPullIntos.length > 0) {\n        assert(controller._pendingPullIntos.peek().readerType === 'default');\n        ReadableByteStreamControllerShiftPendingPullInto(controller);\n      }\n      const transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength);\n      ReadableStreamFulfillReadRequest(stream, transferredView, false);\n    }\n  } else if (ReadableStreamHasBYOBReader(stream)) {\n    // TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully.\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n    ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n  } else {\n    assert(!IsReadableStreamLocked(stream));\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n  }\n\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nexport function ReadableByteStreamControllerError(controller: ReadableByteStreamController, e: any) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (stream._state !== 'readable') {\n    return;\n  }\n\n  ReadableByteStreamControllerClearPendingPullIntos(controller);\n\n  ResetQueue(controller);\n  ReadableByteStreamControllerClearAlgorithms(controller);\n  ReadableStreamError(stream, e);\n}\n\nexport function ReadableByteStreamControllerGetBYOBRequest(\n  controller: ReadableByteStreamController\n): ReadableStreamBYOBRequest | null {\n  if (controller._byobRequest === null && controller._pendingPullIntos.length > 0) {\n    const firstDescriptor = controller._pendingPullIntos.peek();\n    const view = new Uint8Array(firstDescriptor.buffer,\n                                firstDescriptor.byteOffset + firstDescriptor.bytesFilled,\n                                firstDescriptor.byteLength - firstDescriptor.bytesFilled);\n\n    const byobRequest: ReadableStreamBYOBRequest = Object.create(ReadableStreamBYOBRequest.prototype);\n    SetUpReadableStreamBYOBRequest(byobRequest, controller, view);\n    controller._byobRequest = byobRequest;\n  }\n  return controller._byobRequest;\n}\n\nfunction ReadableByteStreamControllerGetDesiredSize(controller: ReadableByteStreamController): number | null {\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'errored') {\n    return null;\n  }\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\nexport function ReadableByteStreamControllerRespond(controller: ReadableByteStreamController, bytesWritten: number) {\n  assert(controller._pendingPullIntos.length > 0);\n\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'closed') {\n    if (bytesWritten !== 0) {\n      throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream');\n    }\n  } else {\n    assert(state === 'readable');\n    if (bytesWritten === 0) {\n      throw new TypeError('bytesWritten must be greater than 0 when calling respond() on a readable stream');\n    }\n    if (firstDescriptor.bytesFilled + bytesWritten > firstDescriptor.byteLength) {\n      throw new RangeError('bytesWritten out of range');\n    }\n  }\n\n  firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer);\n\n  ReadableByteStreamControllerRespondInternal(controller, bytesWritten);\n}\n\nexport function ReadableByteStreamControllerRespondWithNewView(controller: ReadableByteStreamController,\n                                                               view: ArrayBufferView) {\n  assert(controller._pendingPullIntos.length > 0);\n  assert(!IsDetachedBuffer(view.buffer));\n\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'closed') {\n    if (view.byteLength !== 0) {\n      throw new TypeError('The view\\'s length must be 0 when calling respondWithNewView() on a closed stream');\n    }\n  } else {\n    assert(state === 'readable');\n    if (view.byteLength === 0) {\n      throw new TypeError(\n        'The view\\'s length must be greater than 0 when calling respondWithNewView() on a readable stream'\n      );\n    }\n  }\n\n  if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) {\n    throw new RangeError('The region specified by view does not match byobRequest');\n  }\n  if (firstDescriptor.bufferByteLength !== view.buffer.byteLength) {\n    throw new RangeError('The buffer of view has different capacity than byobRequest');\n  }\n  if (firstDescriptor.bytesFilled + view.byteLength > firstDescriptor.byteLength) {\n    throw new RangeError('The region specified by view is larger than byobRequest');\n  }\n\n  const viewByteLength = view.byteLength;\n  firstDescriptor.buffer = TransferArrayBuffer(view.buffer);\n  ReadableByteStreamControllerRespondInternal(controller, viewByteLength);\n}\n\nexport function SetUpReadableByteStreamController(stream: ReadableByteStream,\n                                                  controller: ReadableByteStreamController,\n                                                  startAlgorithm: () => void | PromiseLike<void>,\n                                                  pullAlgorithm: () => Promise<void>,\n                                                  cancelAlgorithm: (reason: any) => Promise<void>,\n                                                  highWaterMark: number,\n                                                  autoAllocateChunkSize: number | undefined) {\n  assert(stream._readableStreamController === undefined);\n  if (autoAllocateChunkSize !== undefined) {\n    assert(NumberIsInteger(autoAllocateChunkSize));\n    assert(autoAllocateChunkSize > 0);\n  }\n\n  controller._controlledReadableByteStream = stream;\n\n  controller._pullAgain = false;\n  controller._pulling = false;\n\n  controller._byobRequest = null;\n\n  // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n  controller._queue = controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._closeRequested = false;\n  controller._started = false;\n\n  controller._strategyHWM = highWaterMark;\n\n  controller._pullAlgorithm = pullAlgorithm;\n  controller._cancelAlgorithm = cancelAlgorithm;\n\n  controller._autoAllocateChunkSize = autoAllocateChunkSize;\n\n  controller._pendingPullIntos = new SimpleQueue();\n\n  stream._readableStreamController = controller;\n\n  const startResult = startAlgorithm();\n  uponPromise(\n    promiseResolvedWith(startResult),\n    () => {\n      controller._started = true;\n\n      assert(!controller._pulling);\n      assert(!controller._pullAgain);\n\n      ReadableByteStreamControllerCallPullIfNeeded(controller);\n    },\n    r => {\n      ReadableByteStreamControllerError(controller, r);\n    }\n  );\n}\n\nexport function SetUpReadableByteStreamControllerFromUnderlyingSource(\n  stream: ReadableByteStream,\n  underlyingByteSource: ValidatedUnderlyingByteSource,\n  highWaterMark: number\n) {\n  const controller: ReadableByteStreamController = Object.create(ReadableByteStreamController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let pullAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let cancelAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingByteSource.start !== undefined) {\n    startAlgorithm = () => underlyingByteSource.start!(controller);\n  }\n  if (underlyingByteSource.pull !== undefined) {\n    pullAlgorithm = () => underlyingByteSource.pull!(controller);\n  }\n  if (underlyingByteSource.cancel !== undefined) {\n    cancelAlgorithm = reason => underlyingByteSource.cancel!(reason);\n  }\n\n  const autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;\n  if (autoAllocateChunkSize === 0) {\n    throw new TypeError('autoAllocateChunkSize must be greater than 0');\n  }\n\n  SetUpReadableByteStreamController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize\n  );\n}\n\nfunction SetUpReadableStreamBYOBRequest(request: ReadableStreamBYOBRequest,\n                                        controller: ReadableByteStreamController,\n                                        view: ArrayBufferView) {\n  assert(IsReadableByteStreamController(controller));\n  assert(typeof view === 'object');\n  assert(ArrayBuffer.isView(view));\n  assert(!IsDetachedBuffer(view.buffer));\n  request._associatedReadableByteStreamController = controller;\n  request._view = view;\n}\n\n// Helper functions for the ReadableStreamBYOBRequest.\n\nfunction byobRequestBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamBYOBRequest.prototype.${name} can only be used on a ReadableStreamBYOBRequest`);\n}\n\n// Helper functions for the ReadableByteStreamController.\n\nfunction byteStreamControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableByteStreamController.prototype.${name} can only be used on a ReadableByteStreamController`);\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericInitialize,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport { IsReadableStreamLocked, ReadableByteStream, ReadableStream } from '../readable-stream';\nimport {\n  IsReadableByteStreamController,\n  ReadableByteStreamController,\n  ReadableByteStreamControllerPullInto\n} from './byte-stream-controller';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { newPromise, promiseRejectedWith } from '../helpers/webidl';\nimport { assertRequiredArgument } from '../validators/basic';\nimport { assertReadableStream } from '../validators/readable-stream';\nimport { IsDetachedBuffer } from '../abstract-ops/ecmascript';\n\n/**\n * A result returned by {@link ReadableStreamBYOBReader.read}.\n *\n * @public\n */\nexport type ReadableStreamBYOBReadResult<T extends ArrayBufferView> = {\n  done: false;\n  value: T;\n} | {\n  done: true;\n  value: T | undefined;\n};\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamBYOBReader(stream: ReadableByteStream): ReadableStreamBYOBReader {\n  return new ReadableStreamBYOBReader(stream);\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamAddReadIntoRequest<T extends ArrayBufferView>(stream: ReadableByteStream,\n                                                                            readIntoRequest: ReadIntoRequest<T>): void {\n  assert(IsReadableStreamBYOBReader(stream._reader));\n  assert(stream._state === 'readable' || stream._state === 'closed');\n\n  (stream._reader! as ReadableStreamBYOBReader)._readIntoRequests.push(readIntoRequest);\n}\n\nexport function ReadableStreamFulfillReadIntoRequest(stream: ReadableByteStream,\n                                                     chunk: ArrayBufferView,\n                                                     done: boolean) {\n  const reader = stream._reader as ReadableStreamBYOBReader;\n\n  assert(reader._readIntoRequests.length > 0);\n\n  const readIntoRequest = reader._readIntoRequests.shift()!;\n  if (done) {\n    readIntoRequest._closeSteps(chunk);\n  } else {\n    readIntoRequest._chunkSteps(chunk);\n  }\n}\n\nexport function ReadableStreamGetNumReadIntoRequests(stream: ReadableByteStream): number {\n  return (stream._reader as ReadableStreamBYOBReader)._readIntoRequests.length;\n}\n\nexport function ReadableStreamHasBYOBReader(stream: ReadableByteStream): boolean {\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return false;\n  }\n\n  if (!IsReadableStreamBYOBReader(reader)) {\n    return false;\n  }\n\n  return true;\n}\n\n// Readers\n\nexport interface ReadIntoRequest<T extends ArrayBufferView> {\n  _chunkSteps(chunk: T): void;\n\n  _closeSteps(chunk: T | undefined): void;\n\n  _errorSteps(e: any): void;\n}\n\n/**\n * A BYOB reader vended by a {@link ReadableStream}.\n *\n * @public\n */\nexport class ReadableStreamBYOBReader {\n  /** @internal */\n  _ownerReadableStream!: ReadableByteStream;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readIntoRequests: SimpleQueue<ReadIntoRequest<any>>;\n\n  constructor(stream: ReadableByteStream) {\n    assertRequiredArgument(stream, 1, 'ReadableStreamBYOBReader');\n    assertReadableStream(stream, 'First parameter');\n\n    if (IsReadableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n    }\n\n    if (!IsReadableByteStreamController(stream._readableStreamController)) {\n      throw new TypeError('Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte ' +\n        'source');\n    }\n\n    ReadableStreamReaderGenericInitialize(this, stream);\n\n    this._readIntoRequests = new SimpleQueue();\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or\n   * the reader's lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('cancel'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('cancel'));\n    }\n\n    return ReadableStreamReaderGenericCancel(this, reason);\n  }\n\n  /**\n   * Attempts to reads bytes into view, and returns a promise resolved with the result.\n   *\n   * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.\n   */\n  read<T extends ArrayBufferView>(view: T): Promise<ReadableStreamBYOBReadResult<T>> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('read'));\n    }\n\n    if (!ArrayBuffer.isView(view)) {\n      return promiseRejectedWith(new TypeError('view must be an array buffer view'));\n    }\n    if (view.byteLength === 0) {\n      return promiseRejectedWith(new TypeError('view must have non-zero byteLength'));\n    }\n    if (view.buffer.byteLength === 0) {\n      return promiseRejectedWith(new TypeError(`view's buffer must have non-zero byteLength`));\n    }\n    if (IsDetachedBuffer(view.buffer)) {\n      return promiseRejectedWith(new TypeError('view\\'s buffer has been detached'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('read from'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamBYOBReadResult<T>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamBYOBReadResult<T>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readIntoRequest: ReadIntoRequest<T> = {\n      _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),\n      _closeSteps: chunk => resolvePromise({ value: chunk, done: true }),\n      _errorSteps: e => rejectPromise(e)\n    };\n    ReadableStreamBYOBReaderRead(this, view, readIntoRequest);\n    return promise;\n  }\n\n  /**\n   * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.\n   * If the associated stream is errored when the lock is released, the reader will appear errored in the same way\n   * from now on; otherwise, the reader will appear closed.\n   *\n   * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by\n   * the reader's {@link ReadableStreamBYOBReader.read | read()} method has not yet been settled. Attempting to\n   * do so will throw a `TypeError` and leave the reader locked to the stream.\n   */\n  releaseLock(): void {\n    if (!IsReadableStreamBYOBReader(this)) {\n      throw byobReaderBrandCheckException('releaseLock');\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return;\n    }\n\n    if (this._readIntoRequests.length > 0) {\n      throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n    }\n\n    ReadableStreamReaderGenericRelease(this);\n  }\n}\n\nObject.defineProperties(ReadableStreamBYOBReader.prototype, {\n  cancel: { enumerable: true },\n  read: { enumerable: true },\n  releaseLock: { enumerable: true },\n  closed: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamBYOBReader.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamBYOBReader',\n    configurable: true\n  });\n}\n\n// Abstract operations for the readers.\n\nexport function IsReadableStreamBYOBReader(x: any): x is ReadableStreamBYOBReader {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readIntoRequests')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamBYOBReader;\n}\n\nexport function ReadableStreamBYOBReaderRead<T extends ArrayBufferView>(\n  reader: ReadableStreamBYOBReader,\n  view: T,\n  readIntoRequest: ReadIntoRequest<T>\n): void {\n  const stream = reader._ownerReadableStream;\n\n  assert(stream !== undefined);\n\n  stream._disturbed = true;\n\n  if (stream._state === 'errored') {\n    readIntoRequest._errorSteps(stream._storedError);\n  } else {\n    ReadableByteStreamControllerPullInto(\n      stream._readableStreamController as ReadableByteStreamController,\n      view,\n      readIntoRequest\n    );\n  }\n}\n\n// Helper functions for the ReadableStreamBYOBReader.\n\nfunction byobReaderBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamBYOBReader.prototype.${name} can only be used on a ReadableStreamBYOBReader`);\n}\n","import { QueuingStrategy, QueuingStrategySizeCallback } from '../queuing-strategy';\nimport NumberIsNaN from '../../stub/number-isnan';\n\nexport function ExtractHighWaterMark(strategy: QueuingStrategy, defaultHWM: number): number {\n  const { highWaterMark } = strategy;\n\n  if (highWaterMark === undefined) {\n    return defaultHWM;\n  }\n\n  if (NumberIsNaN(highWaterMark) || highWaterMark < 0) {\n    throw new RangeError('Invalid highWaterMark');\n  }\n\n  return highWaterMark;\n}\n\nexport function ExtractSizeAlgorithm<T>(strategy: QueuingStrategy<T>): QueuingStrategySizeCallback<T> {\n  const { size } = strategy;\n\n  if (!size) {\n    return () => 1;\n  }\n\n  return size;\n}\n","import { QueuingStrategy, QueuingStrategySizeCallback } from '../queuing-strategy';\nimport { assertDictionary, assertFunction, convertUnrestrictedDouble } from './basic';\n\nexport function convertQueuingStrategy<T>(init: QueuingStrategy<T> | null | undefined,\n                                          context: string): QueuingStrategy<T> {\n  assertDictionary(init, context);\n  const highWaterMark = init?.highWaterMark;\n  const size = init?.size;\n  return {\n    highWaterMark: highWaterMark === undefined ? undefined : convertUnrestrictedDouble(highWaterMark),\n    size: size === undefined ? undefined : convertQueuingStrategySize(size, `${context} has member 'size' that`)\n  };\n}\n\nfunction convertQueuingStrategySize<T>(fn: QueuingStrategySizeCallback<T>,\n                                       context: string): QueuingStrategySizeCallback<T> {\n  assertFunction(fn, context);\n  return chunk => convertUnrestrictedDouble(fn(chunk));\n}\n","import { assertDictionary, assertFunction } from './basic';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\nimport {\n  UnderlyingSink,\n  UnderlyingSinkAbortCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  ValidatedUnderlyingSink\n} from '../writable-stream/underlying-sink';\nimport { WritableStreamDefaultController } from '../writable-stream';\n\nexport function convertUnderlyingSink<W>(original: UnderlyingSink<W> | null,\n                                         context: string): ValidatedUnderlyingSink<W> {\n  assertDictionary(original, context);\n  const abort = original?.abort;\n  const close = original?.close;\n  const start = original?.start;\n  const type = original?.type;\n  const write = original?.write;\n  return {\n    abort: abort === undefined ?\n      undefined :\n      convertUnderlyingSinkAbortCallback(abort, original!, `${context} has member 'abort' that`),\n    close: close === undefined ?\n      undefined :\n      convertUnderlyingSinkCloseCallback(close, original!, `${context} has member 'close' that`),\n    start: start === undefined ?\n      undefined :\n      convertUnderlyingSinkStartCallback(start, original!, `${context} has member 'start' that`),\n    write: write === undefined ?\n      undefined :\n      convertUnderlyingSinkWriteCallback(write, original!, `${context} has member 'write' that`),\n    type\n  };\n}\n\nfunction convertUnderlyingSinkAbortCallback(\n  fn: UnderlyingSinkAbortCallback,\n  original: UnderlyingSink,\n  context: string\n): (reason: any) => Promise<void> {\n  assertFunction(fn, context);\n  return (reason: any) => promiseCall(fn, original, [reason]);\n}\n\nfunction convertUnderlyingSinkCloseCallback(\n  fn: UnderlyingSinkCloseCallback,\n  original: UnderlyingSink,\n  context: string\n): () => Promise<void> {\n  assertFunction(fn, context);\n  return () => promiseCall(fn, original, []);\n}\n\nfunction convertUnderlyingSinkStartCallback(\n  fn: UnderlyingSinkStartCallback,\n  original: UnderlyingSink,\n  context: string\n): UnderlyingSinkStartCallback {\n  assertFunction(fn, context);\n  return (controller: WritableStreamDefaultController) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertUnderlyingSinkWriteCallback<W>(\n  fn: UnderlyingSinkWriteCallback<W>,\n  original: UnderlyingSink<W>,\n  context: string\n): (chunk: W, controller: WritableStreamDefaultController) => Promise<void> {\n  assertFunction(fn, context);\n  return (chunk: W, controller: WritableStreamDefaultController) => promiseCall(fn, original, [chunk, controller]);\n}\n","import { IsWritableStream, WritableStream } from '../writable-stream';\n\nexport function assertWritableStream(x: unknown, context: string): asserts x is WritableStream {\n  if (!IsWritableStream(x)) {\n    throw new TypeError(`${context} is not a WritableStream.`);\n  }\n}\n","/**\n * A signal object that allows you to communicate with a request and abort it if required\n * via its associated `AbortController` object.\n *\n * @remarks\n *   This interface is compatible with the `AbortSignal` interface defined in TypeScript's DOM types.\n *   It is redefined here, so it can be polyfilled without a DOM, for example with\n *   {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.\n *\n * @public\n */\nexport interface AbortSignal {\n  /**\n   * Whether the request is aborted.\n   */\n  readonly aborted: boolean;\n\n  /**\n   * Add an event listener to be triggered when this signal becomes aborted.\n   */\n  addEventListener(type: 'abort', listener: () => void): void;\n\n  /**\n   * Remove an event listener that was previously added with {@link AbortSignal.addEventListener}.\n   */\n  removeEventListener(type: 'abort', listener: () => void): void;\n}\n\nexport function isAbortSignal(value: unknown): value is AbortSignal {\n  if (typeof value !== 'object' || value === null) {\n    return false;\n  }\n  try {\n    return typeof (value as AbortSignal).aborted === 'boolean';\n  } catch {\n    // AbortSignal.prototype.aborted throws if its brand check fails\n    return false;\n  }\n}\n\n/**\n * A controller object that allows you to abort an `AbortSignal` when desired.\n *\n * @remarks\n *   This interface is compatible with the `AbortController` interface defined in TypeScript's DOM types.\n *   It is redefined here, so it can be polyfilled without a DOM, for example with\n *   {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.\n *\n * @internal\n */\nexport interface AbortController {\n  readonly signal: AbortSignal;\n\n  abort(): void;\n}\n\ninterface AbortControllerConstructor {\n  new(): AbortController;\n}\n\nconst supportsAbortController = typeof (AbortController as any) === 'function';\n\n/**\n * Construct a new AbortController, if supported by the platform.\n *\n * @internal\n */\nexport function createAbortController(): AbortController | undefined {\n  if (supportsAbortController) {\n    return new (AbortController as AbortControllerConstructor)();\n  }\n  return undefined;\n}\n","import assert from '../stub/assert';\nimport {\n  newPromise,\n  promiseRejectedWith,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  uponPromise\n} from './helpers/webidl';\nimport {\n  DequeueValue,\n  EnqueueValueWithSize,\n  PeekQueueValue,\n  QueuePair,\n  ResetQueue\n} from './abstract-ops/queue-with-sizes';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { SimpleQueue } from './simple-queue';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { AbortSteps, ErrorSteps } from './abstract-ops/internal-methods';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport {\n  UnderlyingSink,\n  UnderlyingSinkAbortCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  ValidatedUnderlyingSink\n} from './writable-stream/underlying-sink';\nimport { assertObject, assertRequiredArgument } from './validators/basic';\nimport { convertUnderlyingSink } from './validators/underlying-sink';\nimport { assertWritableStream } from './validators/writable-stream';\nimport { AbortController, AbortSignal, createAbortController } from './abort-signal';\n\ntype WritableStreamState = 'writable' | 'closed' | 'erroring' | 'errored';\n\ninterface WriteOrCloseRequest {\n  _resolve: (value?: undefined) => void;\n  _reject: (reason: any) => void;\n}\n\ntype WriteRequest = WriteOrCloseRequest;\ntype CloseRequest = WriteOrCloseRequest;\n\ninterface PendingAbortRequest {\n  _promise: Promise<undefined>;\n  _resolve: (value?: undefined) => void;\n  _reject: (reason: any) => void;\n  _reason: any;\n  _wasAlreadyErroring: boolean;\n}\n\n/**\n * A writable stream represents a destination for data, into which you can write.\n *\n * @public\n */\nclass WritableStream<W = any> {\n  /** @internal */\n  _state!: WritableStreamState;\n  /** @internal */\n  _storedError: any;\n  /** @internal */\n  _writer: WritableStreamDefaultWriter<W> | undefined;\n  /** @internal */\n  _writableStreamController!: WritableStreamDefaultController<W>;\n  /** @internal */\n  _writeRequests!: SimpleQueue<WriteRequest>;\n  /** @internal */\n  _inFlightWriteRequest: WriteRequest | undefined;\n  /** @internal */\n  _closeRequest: CloseRequest | undefined;\n  /** @internal */\n  _inFlightCloseRequest: CloseRequest | undefined;\n  /** @internal */\n  _pendingAbortRequest: PendingAbortRequest | undefined;\n  /** @internal */\n  _backpressure!: boolean;\n\n  constructor(underlyingSink?: UnderlyingSink<W>, strategy?: QueuingStrategy<W>);\n  constructor(rawUnderlyingSink: UnderlyingSink<W> | null | undefined = {},\n              rawStrategy: QueuingStrategy<W> | null | undefined = {}) {\n    if (rawUnderlyingSink === undefined) {\n      rawUnderlyingSink = null;\n    } else {\n      assertObject(rawUnderlyingSink, 'First parameter');\n    }\n\n    const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');\n    const underlyingSink = convertUnderlyingSink(rawUnderlyingSink, 'First parameter');\n\n    InitializeWritableStream(this);\n\n    const type = underlyingSink.type;\n    if (type !== undefined) {\n      throw new RangeError('Invalid type is specified');\n    }\n\n    const sizeAlgorithm = ExtractSizeAlgorithm(strategy);\n    const highWaterMark = ExtractHighWaterMark(strategy, 1);\n\n    SetUpWritableStreamDefaultControllerFromUnderlyingSink(this, underlyingSink, highWaterMark, sizeAlgorithm);\n  }\n\n  /**\n   * Returns whether or not the writable stream is locked to a writer.\n   */\n  get locked(): boolean {\n    if (!IsWritableStream(this)) {\n      throw streamBrandCheckException('locked');\n    }\n\n    return IsWritableStreamLocked(this);\n  }\n\n  /**\n   * Aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be\n   * immediately moved to an errored state, with any queued-up writes discarded. This will also execute any abort\n   * mechanism of the underlying sink.\n   *\n   * The returned promise will fulfill if the stream shuts down successfully, or reject if the underlying sink signaled\n   * that there was an error doing so. Additionally, it will reject with a `TypeError` (without attempting to cancel\n   * the stream) if the stream is currently locked.\n   */\n  abort(reason: any = undefined): Promise<void> {\n    if (!IsWritableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('abort'));\n    }\n\n    if (IsWritableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot abort a stream that already has a writer'));\n    }\n\n    return WritableStreamAbort(this, reason);\n  }\n\n  /**\n   * Closes the stream. The underlying sink will finish processing any previously-written chunks, before invoking its\n   * close behavior. During this time any further attempts to write will fail (without erroring the stream).\n   *\n   * The method returns a promise that will fulfill if all remaining chunks are successfully written and the stream\n   * successfully closes, or rejects if an error is encountered during this process. Additionally, it will reject with\n   * a `TypeError` (without attempting to cancel the stream) if the stream is currently locked.\n   */\n  close() {\n    if (!IsWritableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('close'));\n    }\n\n    if (IsWritableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot close a stream that already has a writer'));\n    }\n\n    if (WritableStreamCloseQueuedOrInFlight(this)) {\n      return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));\n    }\n\n    return WritableStreamClose(this);\n  }\n\n  /**\n   * Creates a {@link WritableStreamDefaultWriter | writer} and locks the stream to the new writer. While the stream\n   * is locked, no other writer can be acquired until this one is released.\n   *\n   * This functionality is especially useful for creating abstractions that desire the ability to write to a stream\n   * without interruption or interleaving. By getting a writer for the stream, you can ensure nobody else can write at\n   * the same time, which would cause the resulting written data to be unpredictable and probably useless.\n   */\n  getWriter(): WritableStreamDefaultWriter<W> {\n    if (!IsWritableStream(this)) {\n      throw streamBrandCheckException('getWriter');\n    }\n\n    return AcquireWritableStreamDefaultWriter(this);\n  }\n}\n\nObject.defineProperties(WritableStream.prototype, {\n  abort: { enumerable: true },\n  close: { enumerable: true },\n  getWriter: { enumerable: true },\n  locked: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStream.prototype, Symbol.toStringTag, {\n    value: 'WritableStream',\n    configurable: true\n  });\n}\n\nexport {\n  AcquireWritableStreamDefaultWriter,\n  CreateWritableStream,\n  IsWritableStream,\n  IsWritableStreamLocked,\n  WritableStream,\n  WritableStreamAbort,\n  WritableStreamDefaultControllerErrorIfNeeded,\n  WritableStreamDefaultWriterCloseWithErrorPropagation,\n  WritableStreamDefaultWriterRelease,\n  WritableStreamDefaultWriterWrite,\n  WritableStreamCloseQueuedOrInFlight,\n  UnderlyingSink,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkAbortCallback\n};\n\n// Abstract operations for the WritableStream.\n\nfunction AcquireWritableStreamDefaultWriter<W>(stream: WritableStream<W>): WritableStreamDefaultWriter<W> {\n  return new WritableStreamDefaultWriter(stream);\n}\n\n// Throws if and only if startAlgorithm throws.\nfunction CreateWritableStream<W>(startAlgorithm: () => void | PromiseLike<void>,\n                                 writeAlgorithm: (chunk: W) => Promise<void>,\n                                 closeAlgorithm: () => Promise<void>,\n                                 abortAlgorithm: (reason: any) => Promise<void>,\n                                 highWaterMark = 1,\n                                 sizeAlgorithm: QueuingStrategySizeCallback<W> = () => 1) {\n  assert(IsNonNegativeNumber(highWaterMark));\n\n  const stream: WritableStream<W> = Object.create(WritableStream.prototype);\n  InitializeWritableStream(stream);\n\n  const controller: WritableStreamDefaultController<W> = Object.create(WritableStreamDefaultController.prototype);\n\n  SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm,\n                                       abortAlgorithm, highWaterMark, sizeAlgorithm);\n  return stream;\n}\n\nfunction InitializeWritableStream<W>(stream: WritableStream<W>) {\n  stream._state = 'writable';\n\n  // The error that will be reported by new method calls once the state becomes errored. Only set when [[state]] is\n  // 'erroring' or 'errored'. May be set to an undefined value.\n  stream._storedError = undefined;\n\n  stream._writer = undefined;\n\n  // Initialize to undefined first because the constructor of the controller checks this\n  // variable to validate the caller.\n  stream._writableStreamController = undefined!;\n\n  // This queue is placed here instead of the writer class in order to allow for passing a writer to the next data\n  // producer without waiting for the queued writes to finish.\n  stream._writeRequests = new SimpleQueue();\n\n  // Write requests are removed from _writeRequests when write() is called on the underlying sink. This prevents\n  // them from being erroneously rejected on error. If a write() call is in-flight, the request is stored here.\n  stream._inFlightWriteRequest = undefined;\n\n  // The promise that was returned from writer.close(). Stored here because it may be fulfilled after the writer\n  // has been detached.\n  stream._closeRequest = undefined;\n\n  // Close request is removed from _closeRequest when close() is called on the underlying sink. This prevents it\n  // from being erroneously rejected on error. If a close() call is in-flight, the request is stored here.\n  stream._inFlightCloseRequest = undefined;\n\n  // The promise that was returned from writer.abort(). This may also be fulfilled after the writer has detached.\n  stream._pendingAbortRequest = undefined;\n\n  // The backpressure signal set by the controller.\n  stream._backpressure = false;\n}\n\nfunction IsWritableStream(x: unknown): x is WritableStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_writableStreamController')) {\n    return false;\n  }\n\n  return x instanceof WritableStream;\n}\n\nfunction IsWritableStreamLocked(stream: WritableStream): boolean {\n  assert(IsWritableStream(stream));\n\n  if (stream._writer === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamAbort(stream: WritableStream, reason: any): Promise<undefined> {\n  if (stream._state === 'closed' || stream._state === 'errored') {\n    return promiseResolvedWith(undefined);\n  }\n  stream._writableStreamController._abortReason = reason;\n  stream._writableStreamController._abortController?.abort();\n\n  // TypeScript narrows the type of `stream._state` down to 'writable' | 'erroring',\n  // but it doesn't know that signaling abort runs author code that might have changed the state.\n  // Widen the type again by casting to WritableStreamState.\n  const state = stream._state as WritableStreamState;\n\n  if (state === 'closed' || state === 'errored') {\n    return promiseResolvedWith(undefined);\n  }\n  if (stream._pendingAbortRequest !== undefined) {\n    return stream._pendingAbortRequest._promise;\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n\n  let wasAlreadyErroring = false;\n  if (state === 'erroring') {\n    wasAlreadyErroring = true;\n    // reason will not be used, so don't keep a reference to it.\n    reason = undefined;\n  }\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    stream._pendingAbortRequest = {\n      _promise: undefined!,\n      _resolve: resolve,\n      _reject: reject,\n      _reason: reason,\n      _wasAlreadyErroring: wasAlreadyErroring\n    };\n  });\n  stream._pendingAbortRequest!._promise = promise;\n\n  if (!wasAlreadyErroring) {\n    WritableStreamStartErroring(stream, reason);\n  }\n\n  return promise;\n}\n\nfunction WritableStreamClose(stream: WritableStream<any>): Promise<undefined> {\n  const state = stream._state;\n  if (state === 'closed' || state === 'errored') {\n    return promiseRejectedWith(new TypeError(\n      `The stream (in ${state} state) is not in the writable state and cannot be closed`));\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n  assert(!WritableStreamCloseQueuedOrInFlight(stream));\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    const closeRequest: CloseRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._closeRequest = closeRequest;\n  });\n\n  const writer = stream._writer;\n  if (writer !== undefined && stream._backpressure && state === 'writable') {\n    defaultWriterReadyPromiseResolve(writer);\n  }\n\n  WritableStreamDefaultControllerClose(stream._writableStreamController);\n\n  return promise;\n}\n\n// WritableStream API exposed for controllers.\n\nfunction WritableStreamAddWriteRequest(stream: WritableStream): Promise<undefined> {\n  assert(IsWritableStreamLocked(stream));\n  assert(stream._state === 'writable');\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    const writeRequest: WriteRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._writeRequests.push(writeRequest);\n  });\n\n  return promise;\n}\n\nfunction WritableStreamDealWithRejection(stream: WritableStream, error: any) {\n  const state = stream._state;\n\n  if (state === 'writable') {\n    WritableStreamStartErroring(stream, error);\n    return;\n  }\n\n  assert(state === 'erroring');\n  WritableStreamFinishErroring(stream);\n}\n\nfunction WritableStreamStartErroring(stream: WritableStream, reason: any) {\n  assert(stream._storedError === undefined);\n  assert(stream._state === 'writable');\n\n  const controller = stream._writableStreamController;\n  assert(controller !== undefined);\n\n  stream._state = 'erroring';\n  stream._storedError = reason;\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);\n  }\n\n  if (!WritableStreamHasOperationMarkedInFlight(stream) && controller._started) {\n    WritableStreamFinishErroring(stream);\n  }\n}\n\nfunction WritableStreamFinishErroring(stream: WritableStream) {\n  assert(stream._state === 'erroring');\n  assert(!WritableStreamHasOperationMarkedInFlight(stream));\n  stream._state = 'errored';\n  stream._writableStreamController[ErrorSteps]();\n\n  const storedError = stream._storedError;\n  stream._writeRequests.forEach(writeRequest => {\n    writeRequest._reject(storedError);\n  });\n  stream._writeRequests = new SimpleQueue();\n\n  if (stream._pendingAbortRequest === undefined) {\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    return;\n  }\n\n  const abortRequest = stream._pendingAbortRequest;\n  stream._pendingAbortRequest = undefined;\n\n  if (abortRequest._wasAlreadyErroring) {\n    abortRequest._reject(storedError);\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    return;\n  }\n\n  const promise = stream._writableStreamController[AbortSteps](abortRequest._reason);\n  uponPromise(\n    promise,\n    () => {\n      abortRequest._resolve();\n      WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    },\n    (reason: any) => {\n      abortRequest._reject(reason);\n      WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    });\n}\n\nfunction WritableStreamFinishInFlightWrite(stream: WritableStream) {\n  assert(stream._inFlightWriteRequest !== undefined);\n  stream._inFlightWriteRequest!._resolve(undefined);\n  stream._inFlightWriteRequest = undefined;\n}\n\nfunction WritableStreamFinishInFlightWriteWithError(stream: WritableStream, error: any) {\n  assert(stream._inFlightWriteRequest !== undefined);\n  stream._inFlightWriteRequest!._reject(error);\n  stream._inFlightWriteRequest = undefined;\n\n  assert(stream._state === 'writable' || stream._state === 'erroring');\n\n  WritableStreamDealWithRejection(stream, error);\n}\n\nfunction WritableStreamFinishInFlightClose(stream: WritableStream) {\n  assert(stream._inFlightCloseRequest !== undefined);\n  stream._inFlightCloseRequest!._resolve(undefined);\n  stream._inFlightCloseRequest = undefined;\n\n  const state = stream._state;\n\n  assert(state === 'writable' || state === 'erroring');\n\n  if (state === 'erroring') {\n    // The error was too late to do anything, so it is ignored.\n    stream._storedError = undefined;\n    if (stream._pendingAbortRequest !== undefined) {\n      stream._pendingAbortRequest._resolve();\n      stream._pendingAbortRequest = undefined;\n    }\n  }\n\n  stream._state = 'closed';\n\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    defaultWriterClosedPromiseResolve(writer);\n  }\n\n  assert(stream._pendingAbortRequest === undefined);\n  assert(stream._storedError === undefined);\n}\n\nfunction WritableStreamFinishInFlightCloseWithError(stream: WritableStream, error: any) {\n  assert(stream._inFlightCloseRequest !== undefined);\n  stream._inFlightCloseRequest!._reject(error);\n  stream._inFlightCloseRequest = undefined;\n\n  assert(stream._state === 'writable' || stream._state === 'erroring');\n\n  // Never execute sink abort() after sink close().\n  if (stream._pendingAbortRequest !== undefined) {\n    stream._pendingAbortRequest._reject(error);\n    stream._pendingAbortRequest = undefined;\n  }\n  WritableStreamDealWithRejection(stream, error);\n}\n\n// TODO(ricea): Fix alphabetical order.\nfunction WritableStreamCloseQueuedOrInFlight(stream: WritableStream): boolean {\n  if (stream._closeRequest === undefined && stream._inFlightCloseRequest === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamHasOperationMarkedInFlight(stream: WritableStream): boolean {\n  if (stream._inFlightWriteRequest === undefined && stream._inFlightCloseRequest === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamMarkCloseRequestInFlight(stream: WritableStream) {\n  assert(stream._inFlightCloseRequest === undefined);\n  assert(stream._closeRequest !== undefined);\n  stream._inFlightCloseRequest = stream._closeRequest;\n  stream._closeRequest = undefined;\n}\n\nfunction WritableStreamMarkFirstWriteRequestInFlight(stream: WritableStream) {\n  assert(stream._inFlightWriteRequest === undefined);\n  assert(stream._writeRequests.length !== 0);\n  stream._inFlightWriteRequest = stream._writeRequests.shift();\n}\n\nfunction WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream: WritableStream) {\n  assert(stream._state === 'errored');\n  if (stream._closeRequest !== undefined) {\n    assert(stream._inFlightCloseRequest === undefined);\n\n    stream._closeRequest._reject(stream._storedError);\n    stream._closeRequest = undefined;\n  }\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    defaultWriterClosedPromiseReject(writer, stream._storedError);\n  }\n}\n\nfunction WritableStreamUpdateBackpressure(stream: WritableStream, backpressure: boolean) {\n  assert(stream._state === 'writable');\n  assert(!WritableStreamCloseQueuedOrInFlight(stream));\n\n  const writer = stream._writer;\n  if (writer !== undefined && backpressure !== stream._backpressure) {\n    if (backpressure) {\n      defaultWriterReadyPromiseReset(writer);\n    } else {\n      assert(!backpressure);\n\n      defaultWriterReadyPromiseResolve(writer);\n    }\n  }\n\n  stream._backpressure = backpressure;\n}\n\n/**\n * A default writer vended by a {@link WritableStream}.\n *\n * @public\n */\nexport class WritableStreamDefaultWriter<W = any> {\n  /** @internal */\n  _ownerWritableStream: WritableStream<W>;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _closedPromiseState!: 'pending' | 'resolved' | 'rejected';\n  /** @internal */\n  _readyPromise!: Promise<undefined>;\n  /** @internal */\n  _readyPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _readyPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readyPromiseState!: 'pending' | 'fulfilled' | 'rejected';\n\n  constructor(stream: WritableStream<W>) {\n    assertRequiredArgument(stream, 1, 'WritableStreamDefaultWriter');\n    assertWritableStream(stream, 'First parameter');\n\n    if (IsWritableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive writing by another writer');\n    }\n\n    this._ownerWritableStream = stream;\n    stream._writer = this;\n\n    const state = stream._state;\n\n    if (state === 'writable') {\n      if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._backpressure) {\n        defaultWriterReadyPromiseInitialize(this);\n      } else {\n        defaultWriterReadyPromiseInitializeAsResolved(this);\n      }\n\n      defaultWriterClosedPromiseInitialize(this);\n    } else if (state === 'erroring') {\n      defaultWriterReadyPromiseInitializeAsRejected(this, stream._storedError);\n      defaultWriterClosedPromiseInitialize(this);\n    } else if (state === 'closed') {\n      defaultWriterReadyPromiseInitializeAsResolved(this);\n      defaultWriterClosedPromiseInitializeAsResolved(this);\n    } else {\n      assert(state === 'errored');\n\n      const storedError = stream._storedError;\n      defaultWriterReadyPromiseInitializeAsRejected(this, storedError);\n      defaultWriterClosedPromiseInitializeAsRejected(this, storedError);\n    }\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or\n   * the writer’s lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * Returns the desired size to fill the stream’s internal queue. It can be negative, if the queue is over-full.\n   * A producer can use this information to determine the right amount of data to write.\n   *\n   * It will be `null` if the stream cannot be successfully written to (due to either being errored, or having an abort\n   * queued up). It will return zero if the stream is closed. And the getter will throw an exception if invoked when\n   * the writer’s lock is released.\n   */\n  get desiredSize(): number | null {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      throw defaultWriterBrandCheckException('desiredSize');\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      throw defaultWriterLockException('desiredSize');\n    }\n\n    return WritableStreamDefaultWriterGetDesiredSize(this);\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the desired size to fill the stream’s internal queue transitions\n   * from non-positive to positive, signaling that it is no longer applying backpressure. Once the desired size dips\n   * back to zero or below, the getter will return a new promise that stays pending until the next transition.\n   *\n   * If the stream becomes errored or aborted, or the writer’s lock is released, the returned promise will become\n   * rejected.\n   */\n  get ready(): Promise<undefined> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('ready'));\n    }\n\n    return this._readyPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link WritableStream.abort | stream.abort(reason)}.\n   */\n  abort(reason: any = undefined): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('abort'));\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('abort'));\n    }\n\n    return WritableStreamDefaultWriterAbort(this, reason);\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link WritableStream.close | stream.close()}.\n   */\n  close(): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('close'));\n    }\n\n    const stream = this._ownerWritableStream;\n\n    if (stream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('close'));\n    }\n\n    if (WritableStreamCloseQueuedOrInFlight(stream)) {\n      return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));\n    }\n\n    return WritableStreamDefaultWriterClose(this);\n  }\n\n  /**\n   * Releases the writer’s lock on the corresponding stream. After the lock is released, the writer is no longer active.\n   * If the associated stream is errored when the lock is released, the writer will appear errored in the same way from\n   * now on; otherwise, the writer will appear closed.\n   *\n   * Note that the lock can still be released even if some ongoing writes have not yet finished (i.e. even if the\n   * promises returned from previous calls to {@link WritableStreamDefaultWriter.write | write()} have not yet settled).\n   * It’s not necessary to hold the lock on the writer for the duration of the write; the lock instead simply prevents\n   * other producers from writing in an interleaved manner.\n   */\n  releaseLock(): void {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      throw defaultWriterBrandCheckException('releaseLock');\n    }\n\n    const stream = this._ownerWritableStream;\n\n    if (stream === undefined) {\n      return;\n    }\n\n    assert(stream._writer !== undefined);\n\n    WritableStreamDefaultWriterRelease(this);\n  }\n\n  /**\n   * Writes the given chunk to the writable stream, by waiting until any previous writes have finished successfully,\n   * and then sending the chunk to the underlying sink's {@link UnderlyingSink.write | write()} method. It will return\n   * a promise that fulfills with undefined upon a successful write, or rejects if the write fails or stream becomes\n   * errored before the writing process is initiated.\n   *\n   * Note that what \"success\" means is up to the underlying sink; it might indicate simply that the chunk has been\n   * accepted, and not necessarily that it is safely saved to its ultimate destination.\n   */\n  write(chunk: W): Promise<void>;\n  write(chunk: W = undefined!): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('write'));\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('write to'));\n    }\n\n    return WritableStreamDefaultWriterWrite(this, chunk);\n  }\n}\n\nObject.defineProperties(WritableStreamDefaultWriter.prototype, {\n  abort: { enumerable: true },\n  close: { enumerable: true },\n  releaseLock: { enumerable: true },\n  write: { enumerable: true },\n  closed: { enumerable: true },\n  desiredSize: { enumerable: true },\n  ready: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStreamDefaultWriter.prototype, Symbol.toStringTag, {\n    value: 'WritableStreamDefaultWriter',\n    configurable: true\n  });\n}\n\n// Abstract operations for the WritableStreamDefaultWriter.\n\nfunction IsWritableStreamDefaultWriter<W = any>(x: any): x is WritableStreamDefaultWriter<W> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) {\n    return false;\n  }\n\n  return x instanceof WritableStreamDefaultWriter;\n}\n\n// A client of WritableStreamDefaultWriter may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultWriterAbort(writer: WritableStreamDefaultWriter, reason: any) {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  return WritableStreamAbort(stream, reason);\n}\n\nfunction WritableStreamDefaultWriterClose(writer: WritableStreamDefaultWriter): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  return WritableStreamClose(stream);\n}\n\nfunction WritableStreamDefaultWriterCloseWithErrorPropagation(writer: WritableStreamDefaultWriter): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  const state = stream._state;\n  if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {\n    return promiseResolvedWith(undefined);\n  }\n\n  if (state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n\n  return WritableStreamDefaultWriterClose(writer);\n}\n\nfunction WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer: WritableStreamDefaultWriter, error: any) {\n  if (writer._closedPromiseState === 'pending') {\n    defaultWriterClosedPromiseReject(writer, error);\n  } else {\n    defaultWriterClosedPromiseResetToRejected(writer, error);\n  }\n}\n\nfunction WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer: WritableStreamDefaultWriter, error: any) {\n  if (writer._readyPromiseState === 'pending') {\n    defaultWriterReadyPromiseReject(writer, error);\n  } else {\n    defaultWriterReadyPromiseResetToRejected(writer, error);\n  }\n}\n\nfunction WritableStreamDefaultWriterGetDesiredSize(writer: WritableStreamDefaultWriter): number | null {\n  const stream = writer._ownerWritableStream;\n  const state = stream._state;\n\n  if (state === 'errored' || state === 'erroring') {\n    return null;\n  }\n\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return WritableStreamDefaultControllerGetDesiredSize(stream._writableStreamController);\n}\n\nfunction WritableStreamDefaultWriterRelease(writer: WritableStreamDefaultWriter) {\n  const stream = writer._ownerWritableStream;\n  assert(stream !== undefined);\n  assert(stream._writer === writer);\n\n  const releasedError = new TypeError(\n    `Writer was released and can no longer be used to monitor the stream's closedness`);\n\n  WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, releasedError);\n\n  // The state transitions to \"errored\" before the sink abort() method runs, but the writer.closed promise is not\n  // rejected until afterwards. This means that simply testing state will not work.\n  WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, releasedError);\n\n  stream._writer = undefined;\n  writer._ownerWritableStream = undefined!;\n}\n\nfunction WritableStreamDefaultWriterWrite<W>(writer: WritableStreamDefaultWriter<W>, chunk: W): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  const controller = stream._writableStreamController;\n\n  const chunkSize = WritableStreamDefaultControllerGetChunkSize(controller, chunk);\n\n  if (stream !== writer._ownerWritableStream) {\n    return promiseRejectedWith(defaultWriterLockException('write to'));\n  }\n\n  const state = stream._state;\n  if (state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n  if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {\n    return promiseRejectedWith(new TypeError('The stream is closing or closed and cannot be written to'));\n  }\n  if (state === 'erroring') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  assert(state === 'writable');\n\n  const promise = WritableStreamAddWriteRequest(stream);\n\n  WritableStreamDefaultControllerWrite(controller, chunk, chunkSize);\n\n  return promise;\n}\n\nconst closeSentinel: unique symbol = {} as any;\n\ntype QueueRecord<W> = W | typeof closeSentinel;\n\n/**\n * Allows control of a {@link WritableStream | writable stream}'s state and internal queue.\n *\n * @public\n */\nexport class WritableStreamDefaultController<W = any> {\n  /** @internal */\n  _controlledWritableStream!: WritableStream<W>;\n  /** @internal */\n  _queue!: SimpleQueue<QueuePair<QueueRecord<W>>>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _abortReason: any;\n  /** @internal */\n  _abortController: AbortController | undefined;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _strategySizeAlgorithm!: QueuingStrategySizeCallback<W>;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _writeAlgorithm!: (chunk: W) => Promise<void>;\n  /** @internal */\n  _closeAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _abortAlgorithm!: (reason: any) => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * The reason which was passed to `WritableStream.abort(reason)` when the stream was aborted.\n   *\n   * @deprecated\n   *  This property has been removed from the specification, see https://github.com/whatwg/streams/pull/1177.\n   *  Use {@link WritableStreamDefaultController.signal}'s `reason` instead.\n   */\n  get abortReason(): any {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('abortReason');\n    }\n    return this._abortReason;\n  }\n\n  /**\n   * An `AbortSignal` that can be used to abort the pending write or close operation when the stream is aborted.\n   */\n  get signal(): AbortSignal {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('signal');\n    }\n    if (this._abortController === undefined) {\n      // Older browsers or older Node versions may not support `AbortController` or `AbortSignal`.\n      // We don't want to bundle and ship an `AbortController` polyfill together with our polyfill,\n      // so instead we only implement support for `signal` if we find a global `AbortController` constructor.\n      throw new TypeError('WritableStreamDefaultController.prototype.signal is not supported');\n    }\n    return this._abortController.signal;\n  }\n\n  /**\n   * Closes the controlled writable stream, making all future interactions with it fail with the given error `e`.\n   *\n   * This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying\n   * sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the\n   * normal lifecycle of interactions with the underlying sink.\n   */\n  error(e: any = undefined): void {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n    const state = this._controlledWritableStream._state;\n    if (state !== 'writable') {\n      // The stream is closed, errored or will be soon. The sink can't do anything useful if it gets an error here, so\n      // just treat it as a no-op.\n      return;\n    }\n\n    WritableStreamDefaultControllerError(this, e);\n  }\n\n  /** @internal */\n  [AbortSteps](reason: any): Promise<void> {\n    const result = this._abortAlgorithm(reason);\n    WritableStreamDefaultControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [ErrorSteps]() {\n    ResetQueue(this);\n  }\n}\n\nObject.defineProperties(WritableStreamDefaultController.prototype, {\n  abortReason: { enumerable: true },\n  signal: { enumerable: true },\n  error: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'WritableStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Abstract operations implementing interface required by the WritableStream.\n\nfunction IsWritableStreamDefaultController(x: any): x is WritableStreamDefaultController<any> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledWritableStream')) {\n    return false;\n  }\n\n  return x instanceof WritableStreamDefaultController;\n}\n\nfunction SetUpWritableStreamDefaultController<W>(stream: WritableStream<W>,\n                                                 controller: WritableStreamDefaultController<W>,\n                                                 startAlgorithm: () => void | PromiseLike<void>,\n                                                 writeAlgorithm: (chunk: W) => Promise<void>,\n                                                 closeAlgorithm: () => Promise<void>,\n                                                 abortAlgorithm: (reason: any) => Promise<void>,\n                                                 highWaterMark: number,\n                                                 sizeAlgorithm: QueuingStrategySizeCallback<W>) {\n  assert(IsWritableStream(stream));\n  assert(stream._writableStreamController === undefined);\n\n  controller._controlledWritableStream = stream;\n  stream._writableStreamController = controller;\n\n  // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n  controller._queue = undefined!;\n  controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._abortReason = undefined;\n  controller._abortController = createAbortController();\n  controller._started = false;\n\n  controller._strategySizeAlgorithm = sizeAlgorithm;\n  controller._strategyHWM = highWaterMark;\n\n  controller._writeAlgorithm = writeAlgorithm;\n  controller._closeAlgorithm = closeAlgorithm;\n  controller._abortAlgorithm = abortAlgorithm;\n\n  const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n  WritableStreamUpdateBackpressure(stream, backpressure);\n\n  const startResult = startAlgorithm();\n  const startPromise = promiseResolvedWith(startResult);\n  uponPromise(\n    startPromise,\n    () => {\n      assert(stream._state === 'writable' || stream._state === 'erroring');\n      controller._started = true;\n      WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n    },\n    r => {\n      assert(stream._state === 'writable' || stream._state === 'erroring');\n      controller._started = true;\n      WritableStreamDealWithRejection(stream, r);\n    }\n  );\n}\n\nfunction SetUpWritableStreamDefaultControllerFromUnderlyingSink<W>(stream: WritableStream<W>,\n                                                                   underlyingSink: ValidatedUnderlyingSink<W>,\n                                                                   highWaterMark: number,\n                                                                   sizeAlgorithm: QueuingStrategySizeCallback<W>) {\n  const controller = Object.create(WritableStreamDefaultController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let writeAlgorithm: (chunk: W) => Promise<void> = () => promiseResolvedWith(undefined);\n  let closeAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let abortAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingSink.start !== undefined) {\n    startAlgorithm = () => underlyingSink.start!(controller);\n  }\n  if (underlyingSink.write !== undefined) {\n    writeAlgorithm = chunk => underlyingSink.write!(chunk, controller);\n  }\n  if (underlyingSink.close !== undefined) {\n    closeAlgorithm = () => underlyingSink.close!();\n  }\n  if (underlyingSink.abort !== undefined) {\n    abortAlgorithm = reason => underlyingSink.abort!(reason);\n  }\n\n  SetUpWritableStreamDefaultController(\n    stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm\n  );\n}\n\n// ClearAlgorithms may be called twice. Erroring the same stream in multiple ways will often result in redundant calls.\nfunction WritableStreamDefaultControllerClearAlgorithms(controller: WritableStreamDefaultController<any>) {\n  controller._writeAlgorithm = undefined!;\n  controller._closeAlgorithm = undefined!;\n  controller._abortAlgorithm = undefined!;\n  controller._strategySizeAlgorithm = undefined!;\n}\n\nfunction WritableStreamDefaultControllerClose<W>(controller: WritableStreamDefaultController<W>) {\n  EnqueueValueWithSize(controller, closeSentinel, 0);\n  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\nfunction WritableStreamDefaultControllerGetChunkSize<W>(controller: WritableStreamDefaultController<W>,\n                                                        chunk: W): number {\n  try {\n    return controller._strategySizeAlgorithm(chunk);\n  } catch (chunkSizeE) {\n    WritableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE);\n    return 1;\n  }\n}\n\nfunction WritableStreamDefaultControllerGetDesiredSize(controller: WritableStreamDefaultController<any>): number {\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\nfunction WritableStreamDefaultControllerWrite<W>(controller: WritableStreamDefaultController<W>,\n                                                 chunk: W,\n                                                 chunkSize: number) {\n  try {\n    EnqueueValueWithSize(controller, chunk, chunkSize);\n  } catch (enqueueE) {\n    WritableStreamDefaultControllerErrorIfNeeded(controller, enqueueE);\n    return;\n  }\n\n  const stream = controller._controlledWritableStream;\n  if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._state === 'writable') {\n    const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n    WritableStreamUpdateBackpressure(stream, backpressure);\n  }\n\n  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\n// Abstract operations for the WritableStreamDefaultController.\n\nfunction WritableStreamDefaultControllerAdvanceQueueIfNeeded<W>(controller: WritableStreamDefaultController<W>) {\n  const stream = controller._controlledWritableStream;\n\n  if (!controller._started) {\n    return;\n  }\n\n  if (stream._inFlightWriteRequest !== undefined) {\n    return;\n  }\n\n  const state = stream._state;\n  assert(state !== 'closed' && state !== 'errored');\n  if (state === 'erroring') {\n    WritableStreamFinishErroring(stream);\n    return;\n  }\n\n  if (controller._queue.length === 0) {\n    return;\n  }\n\n  const value = PeekQueueValue(controller);\n  if (value === closeSentinel) {\n    WritableStreamDefaultControllerProcessClose(controller);\n  } else {\n    WritableStreamDefaultControllerProcessWrite(controller, value);\n  }\n}\n\nfunction WritableStreamDefaultControllerErrorIfNeeded(controller: WritableStreamDefaultController<any>, error: any) {\n  if (controller._controlledWritableStream._state === 'writable') {\n    WritableStreamDefaultControllerError(controller, error);\n  }\n}\n\nfunction WritableStreamDefaultControllerProcessClose(controller: WritableStreamDefaultController<any>) {\n  const stream = controller._controlledWritableStream;\n\n  WritableStreamMarkCloseRequestInFlight(stream);\n\n  DequeueValue(controller);\n  assert(controller._queue.length === 0);\n\n  const sinkClosePromise = controller._closeAlgorithm();\n  WritableStreamDefaultControllerClearAlgorithms(controller);\n  uponPromise(\n    sinkClosePromise,\n    () => {\n      WritableStreamFinishInFlightClose(stream);\n    },\n    reason => {\n      WritableStreamFinishInFlightCloseWithError(stream, reason);\n    }\n  );\n}\n\nfunction WritableStreamDefaultControllerProcessWrite<W>(controller: WritableStreamDefaultController<W>, chunk: W) {\n  const stream = controller._controlledWritableStream;\n\n  WritableStreamMarkFirstWriteRequestInFlight(stream);\n\n  const sinkWritePromise = controller._writeAlgorithm(chunk);\n  uponPromise(\n    sinkWritePromise,\n    () => {\n      WritableStreamFinishInFlightWrite(stream);\n\n      const state = stream._state;\n      assert(state === 'writable' || state === 'erroring');\n\n      DequeueValue(controller);\n\n      if (!WritableStreamCloseQueuedOrInFlight(stream) && state === 'writable') {\n        const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n        WritableStreamUpdateBackpressure(stream, backpressure);\n      }\n\n      WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n    },\n    reason => {\n      if (stream._state === 'writable') {\n        WritableStreamDefaultControllerClearAlgorithms(controller);\n      }\n      WritableStreamFinishInFlightWriteWithError(stream, reason);\n    }\n  );\n}\n\nfunction WritableStreamDefaultControllerGetBackpressure(controller: WritableStreamDefaultController<any>): boolean {\n  const desiredSize = WritableStreamDefaultControllerGetDesiredSize(controller);\n  return desiredSize <= 0;\n}\n\n// A client of WritableStreamDefaultController may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultControllerError(controller: WritableStreamDefaultController<any>, error: any) {\n  const stream = controller._controlledWritableStream;\n\n  assert(stream._state === 'writable');\n\n  WritableStreamDefaultControllerClearAlgorithms(controller);\n  WritableStreamStartErroring(stream, error);\n}\n\n// Helper functions for the WritableStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(`WritableStream.prototype.${name} can only be used on a WritableStream`);\n}\n\n// Helper functions for the WritableStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `WritableStreamDefaultController.prototype.${name} can only be used on a WritableStreamDefaultController`);\n}\n\n\n// Helper functions for the WritableStreamDefaultWriter.\n\nfunction defaultWriterBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `WritableStreamDefaultWriter.prototype.${name} can only be used on a WritableStreamDefaultWriter`);\n}\n\nfunction defaultWriterLockException(name: string): TypeError {\n  return new TypeError('Cannot ' + name + ' a stream using a released writer');\n}\n\nfunction defaultWriterClosedPromiseInitialize(writer: WritableStreamDefaultWriter) {\n  writer._closedPromise = newPromise((resolve, reject) => {\n    writer._closedPromise_resolve = resolve;\n    writer._closedPromise_reject = reject;\n    writer._closedPromiseState = 'pending';\n  });\n}\n\nfunction defaultWriterClosedPromiseInitializeAsRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  defaultWriterClosedPromiseInitialize(writer);\n  defaultWriterClosedPromiseReject(writer, reason);\n}\n\nfunction defaultWriterClosedPromiseInitializeAsResolved(writer: WritableStreamDefaultWriter) {\n  defaultWriterClosedPromiseInitialize(writer);\n  defaultWriterClosedPromiseResolve(writer);\n}\n\nfunction defaultWriterClosedPromiseReject(writer: WritableStreamDefaultWriter, reason: any) {\n  if (writer._closedPromise_reject === undefined) {\n    return;\n  }\n  assert(writer._closedPromiseState === 'pending');\n\n  setPromiseIsHandledToTrue(writer._closedPromise);\n  writer._closedPromise_reject(reason);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'rejected';\n}\n\nfunction defaultWriterClosedPromiseResetToRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  assert(writer._closedPromise_resolve === undefined);\n  assert(writer._closedPromise_reject === undefined);\n  assert(writer._closedPromiseState !== 'pending');\n\n  defaultWriterClosedPromiseInitializeAsRejected(writer, reason);\n}\n\nfunction defaultWriterClosedPromiseResolve(writer: WritableStreamDefaultWriter) {\n  if (writer._closedPromise_resolve === undefined) {\n    return;\n  }\n  assert(writer._closedPromiseState === 'pending');\n\n  writer._closedPromise_resolve(undefined);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'resolved';\n}\n\nfunction defaultWriterReadyPromiseInitialize(writer: WritableStreamDefaultWriter) {\n  writer._readyPromise = newPromise((resolve, reject) => {\n    writer._readyPromise_resolve = resolve;\n    writer._readyPromise_reject = reject;\n  });\n  writer._readyPromiseState = 'pending';\n}\n\nfunction defaultWriterReadyPromiseInitializeAsRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  defaultWriterReadyPromiseInitialize(writer);\n  defaultWriterReadyPromiseReject(writer, reason);\n}\n\nfunction defaultWriterReadyPromiseInitializeAsResolved(writer: WritableStreamDefaultWriter) {\n  defaultWriterReadyPromiseInitialize(writer);\n  defaultWriterReadyPromiseResolve(writer);\n}\n\nfunction defaultWriterReadyPromiseReject(writer: WritableStreamDefaultWriter, reason: any) {\n  if (writer._readyPromise_reject === undefined) {\n    return;\n  }\n\n  setPromiseIsHandledToTrue(writer._readyPromise);\n  writer._readyPromise_reject(reason);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'rejected';\n}\n\nfunction defaultWriterReadyPromiseReset(writer: WritableStreamDefaultWriter) {\n  assert(writer._readyPromise_resolve === undefined);\n  assert(writer._readyPromise_reject === undefined);\n\n  defaultWriterReadyPromiseInitialize(writer);\n}\n\nfunction defaultWriterReadyPromiseResetToRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  assert(writer._readyPromise_resolve === undefined);\n  assert(writer._readyPromise_reject === undefined);\n\n  defaultWriterReadyPromiseInitializeAsRejected(writer, reason);\n}\n\nfunction defaultWriterReadyPromiseResolve(writer: WritableStreamDefaultWriter) {\n  if (writer._readyPromise_resolve === undefined) {\n    return;\n  }\n\n  writer._readyPromise_resolve(undefined);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'fulfilled';\n}\n","/// <reference lib=\"dom\" />\nexport const NativeDOMException: typeof DOMException | undefined =\n  typeof DOMException !== 'undefined' ? DOMException : undefined;\n","/// <reference types=\"node\" />\nimport { NativeDOMException } from './native';\n\ndeclare class DOMExceptionClass extends Error {\n  constructor(message?: string, name?: string);\n\n  name: string;\n  message: string;\n}\n\ntype DOMException = DOMExceptionClass;\ntype DOMExceptionConstructor = typeof DOMExceptionClass;\n\nfunction isDOMExceptionConstructor(ctor: unknown): ctor is DOMExceptionConstructor {\n  if (!(typeof ctor === 'function' || typeof ctor === 'object')) {\n    return false;\n  }\n  try {\n    new (ctor as DOMExceptionConstructor)();\n    return true;\n  } catch {\n    return false;\n  }\n}\n\nfunction createDOMExceptionPolyfill(): DOMExceptionConstructor {\n  // eslint-disable-next-line no-shadow\n  const ctor = function DOMException(this: DOMException, message?: string, name?: string) {\n    this.message = message || '';\n    this.name = name || 'Error';\n    if (Error.captureStackTrace) {\n      Error.captureStackTrace(this, this.constructor);\n    }\n  } as any;\n  ctor.prototype = Object.create(Error.prototype);\n  Object.defineProperty(ctor.prototype, 'constructor', { value: ctor, writable: true, configurable: true });\n  return ctor;\n}\n\n// eslint-disable-next-line no-redeclare\nconst DOMException: DOMExceptionConstructor =\n  isDOMExceptionConstructor(NativeDOMException) ? NativeDOMException : createDOMExceptionPolyfill();\n\nexport { DOMException };\n","import { IsReadableStream, IsReadableStreamLocked, ReadableStream, ReadableStreamCancel } from '../readable-stream';\nimport { AcquireReadableStreamDefaultReader, ReadableStreamDefaultReaderRead } from './default-reader';\nimport { ReadableStreamReaderGenericRelease } from './generic-reader';\nimport {\n  AcquireWritableStreamDefaultWriter,\n  IsWritableStream,\n  IsWritableStreamLocked,\n  WritableStream,\n  WritableStreamAbort,\n  WritableStreamCloseQueuedOrInFlight,\n  WritableStreamDefaultWriterCloseWithErrorPropagation,\n  WritableStreamDefaultWriterRelease,\n  WritableStreamDefaultWriterWrite\n} from '../writable-stream';\nimport assert from '../../stub/assert';\nimport {\n  newPromise,\n  PerformPromiseThen,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  uponFulfillment,\n  uponPromise,\n  uponRejection\n} from '../helpers/webidl';\nimport { noop } from '../../utils';\nimport { AbortSignal, isAbortSignal } from '../abort-signal';\nimport { DOMException } from '../../stub/dom-exception';\n\nexport function ReadableStreamPipeTo<T>(source: ReadableStream<T>,\n                                        dest: WritableStream<T>,\n                                        preventClose: boolean,\n                                        preventAbort: boolean,\n                                        preventCancel: boolean,\n                                        signal: AbortSignal | undefined): Promise<undefined> {\n  assert(IsReadableStream(source));\n  assert(IsWritableStream(dest));\n  assert(typeof preventClose === 'boolean');\n  assert(typeof preventAbort === 'boolean');\n  assert(typeof preventCancel === 'boolean');\n  assert(signal === undefined || isAbortSignal(signal));\n  assert(!IsReadableStreamLocked(source));\n  assert(!IsWritableStreamLocked(dest));\n\n  const reader = AcquireReadableStreamDefaultReader<T>(source);\n  const writer = AcquireWritableStreamDefaultWriter<T>(dest);\n\n  source._disturbed = true;\n\n  let shuttingDown = false;\n\n  // This is used to keep track of the spec's requirement that we wait for ongoing writes during shutdown.\n  let currentWrite = promiseResolvedWith<void>(undefined);\n\n  return newPromise((resolve, reject) => {\n    let abortAlgorithm: () => void;\n    if (signal !== undefined) {\n      abortAlgorithm = () => {\n        const error = new DOMException('Aborted', 'AbortError');\n        const actions: Array<() => Promise<void>> = [];\n        if (!preventAbort) {\n          actions.push(() => {\n            if (dest._state === 'writable') {\n              return WritableStreamAbort(dest, error);\n            }\n            return promiseResolvedWith(undefined);\n          });\n        }\n        if (!preventCancel) {\n          actions.push(() => {\n            if (source._state === 'readable') {\n              return ReadableStreamCancel(source, error);\n            }\n            return promiseResolvedWith(undefined);\n          });\n        }\n        shutdownWithAction(() => Promise.all(actions.map(action => action())), true, error);\n      };\n\n      if (signal.aborted) {\n        abortAlgorithm();\n        return;\n      }\n\n      signal.addEventListener('abort', abortAlgorithm);\n    }\n\n    // Using reader and writer, read all chunks from this and write them to dest\n    // - Backpressure must be enforced\n    // - Shutdown must stop all activity\n    function pipeLoop() {\n      return newPromise<void>((resolveLoop, rejectLoop) => {\n        function next(done: boolean) {\n          if (done) {\n            resolveLoop();\n          } else {\n            // Use `PerformPromiseThen` instead of `uponPromise` to avoid\n            // adding unnecessary `.catch(rethrowAssertionErrorRejection)` handlers\n            PerformPromiseThen(pipeStep(), next, rejectLoop);\n          }\n        }\n\n        next(false);\n      });\n    }\n\n    function pipeStep(): Promise<boolean> {\n      if (shuttingDown) {\n        return promiseResolvedWith(true);\n      }\n\n      return PerformPromiseThen(writer._readyPromise, () => {\n        return newPromise<boolean>((resolveRead, rejectRead) => {\n          ReadableStreamDefaultReaderRead(\n            reader,\n            {\n              _chunkSteps: chunk => {\n                currentWrite = PerformPromiseThen(WritableStreamDefaultWriterWrite(writer, chunk), undefined, noop);\n                resolveRead(false);\n              },\n              _closeSteps: () => resolveRead(true),\n              _errorSteps: rejectRead\n            }\n          );\n        });\n      });\n    }\n\n    // Errors must be propagated forward\n    isOrBecomesErrored(source, reader._closedPromise, storedError => {\n      if (!preventAbort) {\n        shutdownWithAction(() => WritableStreamAbort(dest, storedError), true, storedError);\n      } else {\n        shutdown(true, storedError);\n      }\n    });\n\n    // Errors must be propagated backward\n    isOrBecomesErrored(dest, writer._closedPromise, storedError => {\n      if (!preventCancel) {\n        shutdownWithAction(() => ReadableStreamCancel(source, storedError), true, storedError);\n      } else {\n        shutdown(true, storedError);\n      }\n    });\n\n    // Closing must be propagated forward\n    isOrBecomesClosed(source, reader._closedPromise, () => {\n      if (!preventClose) {\n        shutdownWithAction(() => WritableStreamDefaultWriterCloseWithErrorPropagation(writer));\n      } else {\n        shutdown();\n      }\n    });\n\n    // Closing must be propagated backward\n    if (WritableStreamCloseQueuedOrInFlight(dest) || dest._state === 'closed') {\n      const destClosed = new TypeError('the destination writable stream closed before all data could be piped to it');\n\n      if (!preventCancel) {\n        shutdownWithAction(() => ReadableStreamCancel(source, destClosed), true, destClosed);\n      } else {\n        shutdown(true, destClosed);\n      }\n    }\n\n    setPromiseIsHandledToTrue(pipeLoop());\n\n    function waitForWritesToFinish(): Promise<void> {\n      // Another write may have started while we were waiting on this currentWrite, so we have to be sure to wait\n      // for that too.\n      const oldCurrentWrite = currentWrite;\n      return PerformPromiseThen(\n        currentWrite,\n        () => oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined\n      );\n    }\n\n    function isOrBecomesErrored(stream: ReadableStream | WritableStream,\n                                promise: Promise<void>,\n                                action: (reason: any) => void) {\n      if (stream._state === 'errored') {\n        action(stream._storedError);\n      } else {\n        uponRejection(promise, action);\n      }\n    }\n\n    function isOrBecomesClosed(stream: ReadableStream | WritableStream, promise: Promise<void>, action: () => void) {\n      if (stream._state === 'closed') {\n        action();\n      } else {\n        uponFulfillment(promise, action);\n      }\n    }\n\n    function shutdownWithAction(action: () => Promise<unknown>, originalIsError?: boolean, originalError?: any) {\n      if (shuttingDown) {\n        return;\n      }\n      shuttingDown = true;\n\n      if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {\n        uponFulfillment(waitForWritesToFinish(), doTheRest);\n      } else {\n        doTheRest();\n      }\n\n      function doTheRest() {\n        uponPromise(\n          action(),\n          () => finalize(originalIsError, originalError),\n          newError => finalize(true, newError)\n        );\n      }\n    }\n\n    function shutdown(isError?: boolean, error?: any) {\n      if (shuttingDown) {\n        return;\n      }\n      shuttingDown = true;\n\n      if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {\n        uponFulfillment(waitForWritesToFinish(), () => finalize(isError, error));\n      } else {\n        finalize(isError, error);\n      }\n    }\n\n    function finalize(isError?: boolean, error?: any) {\n      WritableStreamDefaultWriterRelease(writer);\n      ReadableStreamReaderGenericRelease(reader);\n\n      if (signal !== undefined) {\n        signal.removeEventListener('abort', abortAlgorithm);\n      }\n      if (isError) {\n        reject(error);\n      } else {\n        resolve(undefined);\n      }\n    }\n  });\n}\n","import { QueuingStrategySizeCallback } from '../queuing-strategy';\nimport assert from '../../stub/assert';\nimport { DequeueValue, EnqueueValueWithSize, QueuePair, ResetQueue } from '../abstract-ops/queue-with-sizes';\nimport {\n  ReadableStreamAddReadRequest,\n  ReadableStreamFulfillReadRequest,\n  ReadableStreamGetNumReadRequests,\n  ReadRequest\n} from './default-reader';\nimport { SimpleQueue } from '../simple-queue';\nimport { IsReadableStreamLocked, ReadableStream, ReadableStreamClose, ReadableStreamError } from '../readable-stream';\nimport { ValidatedUnderlyingSource } from './underlying-source';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { CancelSteps, PullSteps } from '../abstract-ops/internal-methods';\nimport { promiseResolvedWith, uponPromise } from '../helpers/webidl';\n\n/**\n * Allows control of a {@link ReadableStream | readable stream}'s state and internal queue.\n *\n * @public\n */\nexport class ReadableStreamDefaultController<R> {\n  /** @internal */\n  _controlledReadableStream!: ReadableStream<R>;\n  /** @internal */\n  _queue!: SimpleQueue<QueuePair<R>>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _closeRequested!: boolean;\n  /** @internal */\n  _pullAgain!: boolean;\n  /** @internal */\n  _pulling !: boolean;\n  /** @internal */\n  _strategySizeAlgorithm!: QueuingStrategySizeCallback<R>;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _pullAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _cancelAlgorithm!: (reason: any) => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is\n   * over-full. An underlying source ought to use this information to determine when and how to apply backpressure.\n   */\n  get desiredSize(): number | null {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('desiredSize');\n    }\n\n    return ReadableStreamDefaultControllerGetDesiredSize(this);\n  }\n\n  /**\n   * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from\n   * the stream, but once those are read, the stream will become closed.\n   */\n  close(): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('close');\n    }\n\n    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {\n      throw new TypeError('The stream is not in a state that permits close');\n    }\n\n    ReadableStreamDefaultControllerClose(this);\n  }\n\n  /**\n   * Enqueues the given chunk `chunk` in the controlled readable stream.\n   */\n  enqueue(chunk: R): void;\n  enqueue(chunk: R = undefined!): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('enqueue');\n    }\n\n    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {\n      throw new TypeError('The stream is not in a state that permits enqueue');\n    }\n\n    return ReadableStreamDefaultControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.\n   */\n  error(e: any = undefined): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n\n    ReadableStreamDefaultControllerError(this, e);\n  }\n\n  /** @internal */\n  [CancelSteps](reason: any): Promise<void> {\n    ResetQueue(this);\n    const result = this._cancelAlgorithm(reason);\n    ReadableStreamDefaultControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [PullSteps](readRequest: ReadRequest<R>): void {\n    const stream = this._controlledReadableStream;\n\n    if (this._queue.length > 0) {\n      const chunk = DequeueValue(this);\n\n      if (this._closeRequested && this._queue.length === 0) {\n        ReadableStreamDefaultControllerClearAlgorithms(this);\n        ReadableStreamClose(stream);\n      } else {\n        ReadableStreamDefaultControllerCallPullIfNeeded(this);\n      }\n\n      readRequest._chunkSteps(chunk);\n    } else {\n      ReadableStreamAddReadRequest(stream, readRequest);\n      ReadableStreamDefaultControllerCallPullIfNeeded(this);\n    }\n  }\n}\n\nObject.defineProperties(ReadableStreamDefaultController.prototype, {\n  close: { enumerable: true },\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Abstract operations for the ReadableStreamDefaultController.\n\nfunction IsReadableStreamDefaultController<R = any>(x: any): x is ReadableStreamDefaultController<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableStream')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamDefaultController;\n}\n\nfunction ReadableStreamDefaultControllerCallPullIfNeeded(controller: ReadableStreamDefaultController<any>): void {\n  const shouldPull = ReadableStreamDefaultControllerShouldCallPull(controller);\n  if (!shouldPull) {\n    return;\n  }\n\n  if (controller._pulling) {\n    controller._pullAgain = true;\n    return;\n  }\n\n  assert(!controller._pullAgain);\n\n  controller._pulling = true;\n\n  const pullPromise = controller._pullAlgorithm();\n  uponPromise(\n    pullPromise,\n    () => {\n      controller._pulling = false;\n\n      if (controller._pullAgain) {\n        controller._pullAgain = false;\n        ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n      }\n    },\n    e => {\n      ReadableStreamDefaultControllerError(controller, e);\n    }\n  );\n}\n\nfunction ReadableStreamDefaultControllerShouldCallPull(controller: ReadableStreamDefaultController<any>): boolean {\n  const stream = controller._controlledReadableStream;\n\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return false;\n  }\n\n  if (!controller._started) {\n    return false;\n  }\n\n  if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    return true;\n  }\n\n  const desiredSize = ReadableStreamDefaultControllerGetDesiredSize(controller);\n  assert(desiredSize !== null);\n  if (desiredSize! > 0) {\n    return true;\n  }\n\n  return false;\n}\n\nfunction ReadableStreamDefaultControllerClearAlgorithms(controller: ReadableStreamDefaultController<any>) {\n  controller._pullAlgorithm = undefined!;\n  controller._cancelAlgorithm = undefined!;\n  controller._strategySizeAlgorithm = undefined!;\n}\n\n// A client of ReadableStreamDefaultController may use these functions directly to bypass state check.\n\nexport function ReadableStreamDefaultControllerClose(controller: ReadableStreamDefaultController<any>) {\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return;\n  }\n\n  const stream = controller._controlledReadableStream;\n\n  controller._closeRequested = true;\n\n  if (controller._queue.length === 0) {\n    ReadableStreamDefaultControllerClearAlgorithms(controller);\n    ReadableStreamClose(stream);\n  }\n}\n\nexport function ReadableStreamDefaultControllerEnqueue<R>(\n  controller: ReadableStreamDefaultController<R>,\n  chunk: R\n): void {\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return;\n  }\n\n  const stream = controller._controlledReadableStream;\n\n  if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    ReadableStreamFulfillReadRequest(stream, chunk, false);\n  } else {\n    let chunkSize;\n    try {\n      chunkSize = controller._strategySizeAlgorithm(chunk);\n    } catch (chunkSizeE) {\n      ReadableStreamDefaultControllerError(controller, chunkSizeE);\n      throw chunkSizeE;\n    }\n\n    try {\n      EnqueueValueWithSize(controller, chunk, chunkSize);\n    } catch (enqueueE) {\n      ReadableStreamDefaultControllerError(controller, enqueueE);\n      throw enqueueE;\n    }\n  }\n\n  ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n}\n\nexport function ReadableStreamDefaultControllerError(controller: ReadableStreamDefaultController<any>, e: any) {\n  const stream = controller._controlledReadableStream;\n\n  if (stream._state !== 'readable') {\n    return;\n  }\n\n  ResetQueue(controller);\n\n  ReadableStreamDefaultControllerClearAlgorithms(controller);\n  ReadableStreamError(stream, e);\n}\n\nexport function ReadableStreamDefaultControllerGetDesiredSize(\n  controller: ReadableStreamDefaultController<any>\n): number | null {\n  const state = controller._controlledReadableStream._state;\n\n  if (state === 'errored') {\n    return null;\n  }\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\n// This is used in the implementation of TransformStream.\nexport function ReadableStreamDefaultControllerHasBackpressure(\n  controller: ReadableStreamDefaultController<any>\n): boolean {\n  if (ReadableStreamDefaultControllerShouldCallPull(controller)) {\n    return false;\n  }\n\n  return true;\n}\n\nexport function ReadableStreamDefaultControllerCanCloseOrEnqueue(\n  controller: ReadableStreamDefaultController<any>\n): boolean {\n  const state = controller._controlledReadableStream._state;\n\n  if (!controller._closeRequested && state === 'readable') {\n    return true;\n  }\n\n  return false;\n}\n\nexport function SetUpReadableStreamDefaultController<R>(stream: ReadableStream<R>,\n                                                        controller: ReadableStreamDefaultController<R>,\n                                                        startAlgorithm: () => void | PromiseLike<void>,\n                                                        pullAlgorithm: () => Promise<void>,\n                                                        cancelAlgorithm: (reason: any) => Promise<void>,\n                                                        highWaterMark: number,\n                                                        sizeAlgorithm: QueuingStrategySizeCallback<R>) {\n  assert(stream._readableStreamController === undefined);\n\n  controller._controlledReadableStream = stream;\n\n  controller._queue = undefined!;\n  controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._started = false;\n  controller._closeRequested = false;\n  controller._pullAgain = false;\n  controller._pulling = false;\n\n  controller._strategySizeAlgorithm = sizeAlgorithm;\n  controller._strategyHWM = highWaterMark;\n\n  controller._pullAlgorithm = pullAlgorithm;\n  controller._cancelAlgorithm = cancelAlgorithm;\n\n  stream._readableStreamController = controller;\n\n  const startResult = startAlgorithm();\n  uponPromise(\n    promiseResolvedWith(startResult),\n    () => {\n      controller._started = true;\n\n      assert(!controller._pulling);\n      assert(!controller._pullAgain);\n\n      ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n    },\n    r => {\n      ReadableStreamDefaultControllerError(controller, r);\n    }\n  );\n}\n\nexport function SetUpReadableStreamDefaultControllerFromUnderlyingSource<R>(\n  stream: ReadableStream<R>,\n  underlyingSource: ValidatedUnderlyingSource<R>,\n  highWaterMark: number,\n  sizeAlgorithm: QueuingStrategySizeCallback<R>\n) {\n  const controller: ReadableStreamDefaultController<R> = Object.create(ReadableStreamDefaultController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let pullAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let cancelAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingSource.start !== undefined) {\n    startAlgorithm = () => underlyingSource.start!(controller);\n  }\n  if (underlyingSource.pull !== undefined) {\n    pullAlgorithm = () => underlyingSource.pull!(controller);\n  }\n  if (underlyingSource.cancel !== undefined) {\n    cancelAlgorithm = reason => underlyingSource.cancel!(reason);\n  }\n\n  SetUpReadableStreamDefaultController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm\n  );\n}\n\n// Helper functions for the ReadableStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamDefaultController.prototype.${name} can only be used on a ReadableStreamDefaultController`);\n}\n","import {\n  CreateReadableByteStream,\n  CreateReadableStream,\n  IsReadableStream,\n  ReadableByteStream,\n  ReadableStream,\n  ReadableStreamCancel,\n  ReadableStreamReader\n} from '../readable-stream';\nimport { ReadableStreamReaderGenericRelease } from './generic-reader';\nimport {\n  AcquireReadableStreamDefaultReader,\n  IsReadableStreamDefaultReader,\n  ReadableStreamDefaultReaderRead,\n  ReadRequest\n} from './default-reader';\nimport {\n  AcquireReadableStreamBYOBReader,\n  IsReadableStreamBYOBReader,\n  ReadableStreamBYOBReaderRead,\n  ReadIntoRequest\n} from './byob-reader';\nimport assert from '../../stub/assert';\nimport { newPromise, promiseResolvedWith, queueMicrotask, uponRejection } from '../helpers/webidl';\nimport {\n  ReadableStreamDefaultController,\n  ReadableStreamDefaultControllerClose,\n  ReadableStreamDefaultControllerEnqueue,\n  ReadableStreamDefaultControllerError\n} from './default-controller';\nimport {\n  IsReadableByteStreamController,\n  ReadableByteStreamControllerClose,\n  ReadableByteStreamControllerEnqueue,\n  ReadableByteStreamControllerError,\n  ReadableByteStreamControllerGetBYOBRequest,\n  ReadableByteStreamControllerRespond,\n  ReadableByteStreamControllerRespondWithNewView\n} from './byte-stream-controller';\nimport { CreateArrayFromList } from '../abstract-ops/ecmascript';\nimport { CloneAsUint8Array } from '../abstract-ops/miscellaneous';\n\nexport function ReadableStreamTee<R>(stream: ReadableStream<R>,\n                                     cloneForBranch2: boolean): [ReadableStream<R>, ReadableStream<R>] {\n  assert(IsReadableStream(stream));\n  assert(typeof cloneForBranch2 === 'boolean');\n  if (IsReadableByteStreamController(stream._readableStreamController)) {\n    return ReadableByteStreamTee(stream as unknown as ReadableByteStream) as\n      unknown as [ReadableStream<R>, ReadableStream<R>];\n  }\n  return ReadableStreamDefaultTee(stream, cloneForBranch2);\n}\n\nexport function ReadableStreamDefaultTee<R>(stream: ReadableStream<R>,\n                                            cloneForBranch2: boolean): [ReadableStream<R>, ReadableStream<R>] {\n  assert(IsReadableStream(stream));\n  assert(typeof cloneForBranch2 === 'boolean');\n\n  const reader = AcquireReadableStreamDefaultReader<R>(stream);\n\n  let reading = false;\n  let readAgain = false;\n  let canceled1 = false;\n  let canceled2 = false;\n  let reason1: any;\n  let reason2: any;\n  let branch1: ReadableStream<R>;\n  let branch2: ReadableStream<R>;\n\n  let resolveCancelPromise: (value: undefined | Promise<undefined>) => void;\n  const cancelPromise = newPromise<undefined>(resolve => {\n    resolveCancelPromise = resolve;\n  });\n\n  function pullAlgorithm(): Promise<void> {\n    if (reading) {\n      readAgain = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgain = false;\n          const chunk1 = chunk;\n          const chunk2 = chunk;\n\n          // There is no way to access the cloning code right now in the reference implementation.\n          // If we add one then we'll need an implementation for serializable objects.\n          // if (!canceled2 && cloneForBranch2) {\n          //   chunk2 = StructuredDeserialize(StructuredSerialize(chunk2));\n          // }\n\n          if (!canceled1) {\n            ReadableStreamDefaultControllerEnqueue(\n              branch1._readableStreamController as ReadableStreamDefaultController<R>,\n              chunk1\n            );\n          }\n          if (!canceled2) {\n            ReadableStreamDefaultControllerEnqueue(\n              branch2._readableStreamController as ReadableStreamDefaultController<R>,\n              chunk2\n            );\n          }\n\n          reading = false;\n          if (readAgain) {\n            pullAlgorithm();\n          }\n        });\n      },\n      _closeSteps: () => {\n        reading = false;\n        if (!canceled1) {\n          ReadableStreamDefaultControllerClose(branch1._readableStreamController as ReadableStreamDefaultController<R>);\n        }\n        if (!canceled2) {\n          ReadableStreamDefaultControllerClose(branch2._readableStreamController as ReadableStreamDefaultController<R>);\n        }\n\n        if (!canceled1 || !canceled2) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function cancel1Algorithm(reason: any): Promise<void> {\n    canceled1 = true;\n    reason1 = reason;\n    if (canceled2) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function cancel2Algorithm(reason: any): Promise<void> {\n    canceled2 = true;\n    reason2 = reason;\n    if (canceled1) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function startAlgorithm() {\n    // do nothing\n  }\n\n  branch1 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel1Algorithm);\n  branch2 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel2Algorithm);\n\n  uponRejection(reader._closedPromise, (r: any) => {\n    ReadableStreamDefaultControllerError(branch1._readableStreamController as ReadableStreamDefaultController<R>, r);\n    ReadableStreamDefaultControllerError(branch2._readableStreamController as ReadableStreamDefaultController<R>, r);\n    if (!canceled1 || !canceled2) {\n      resolveCancelPromise(undefined);\n    }\n  });\n\n  return [branch1, branch2];\n}\n\nexport function ReadableByteStreamTee(stream: ReadableByteStream): [ReadableByteStream, ReadableByteStream] {\n  assert(IsReadableStream(stream));\n  assert(IsReadableByteStreamController(stream._readableStreamController));\n\n  let reader: ReadableStreamReader<Uint8Array> = AcquireReadableStreamDefaultReader(stream);\n  let reading = false;\n  let readAgainForBranch1 = false;\n  let readAgainForBranch2 = false;\n  let canceled1 = false;\n  let canceled2 = false;\n  let reason1: any;\n  let reason2: any;\n  let branch1: ReadableByteStream;\n  let branch2: ReadableByteStream;\n\n  let resolveCancelPromise: (value: undefined | Promise<undefined>) => void;\n  const cancelPromise = newPromise<void>(resolve => {\n    resolveCancelPromise = resolve;\n  });\n\n  function forwardReaderError(thisReader: ReadableStreamReader<Uint8Array>) {\n    uponRejection(thisReader._closedPromise, r => {\n      if (thisReader !== reader) {\n        return;\n      }\n      ReadableByteStreamControllerError(branch1._readableStreamController, r);\n      ReadableByteStreamControllerError(branch2._readableStreamController, r);\n      if (!canceled1 || !canceled2) {\n        resolveCancelPromise(undefined);\n      }\n    });\n  }\n\n  function pullWithDefaultReader() {\n    if (IsReadableStreamBYOBReader(reader)) {\n      assert(reader._readIntoRequests.length === 0);\n      ReadableStreamReaderGenericRelease(reader);\n\n      reader = AcquireReadableStreamDefaultReader(stream);\n      forwardReaderError(reader);\n    }\n\n    const readRequest: ReadRequest<Uint8Array> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgainForBranch1 = false;\n          readAgainForBranch2 = false;\n\n          const chunk1 = chunk;\n          let chunk2 = chunk;\n          if (!canceled1 && !canceled2) {\n            try {\n              chunk2 = CloneAsUint8Array(chunk);\n            } catch (cloneE) {\n              ReadableByteStreamControllerError(branch1._readableStreamController, cloneE);\n              ReadableByteStreamControllerError(branch2._readableStreamController, cloneE);\n              resolveCancelPromise(ReadableStreamCancel(stream, cloneE));\n              return;\n            }\n          }\n\n          if (!canceled1) {\n            ReadableByteStreamControllerEnqueue(branch1._readableStreamController, chunk1);\n          }\n          if (!canceled2) {\n            ReadableByteStreamControllerEnqueue(branch2._readableStreamController, chunk2);\n          }\n\n          reading = false;\n          if (readAgainForBranch1) {\n            pull1Algorithm();\n          } else if (readAgainForBranch2) {\n            pull2Algorithm();\n          }\n        });\n      },\n      _closeSteps: () => {\n        reading = false;\n        if (!canceled1) {\n          ReadableByteStreamControllerClose(branch1._readableStreamController);\n        }\n        if (!canceled2) {\n          ReadableByteStreamControllerClose(branch2._readableStreamController);\n        }\n        if (branch1._readableStreamController._pendingPullIntos.length > 0) {\n          ReadableByteStreamControllerRespond(branch1._readableStreamController, 0);\n        }\n        if (branch2._readableStreamController._pendingPullIntos.length > 0) {\n          ReadableByteStreamControllerRespond(branch2._readableStreamController, 0);\n        }\n        if (!canceled1 || !canceled2) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n  }\n\n  function pullWithBYOBReader(view: ArrayBufferView, forBranch2: boolean) {\n    if (IsReadableStreamDefaultReader<Uint8Array>(reader)) {\n      assert(reader._readRequests.length === 0);\n      ReadableStreamReaderGenericRelease(reader);\n\n      reader = AcquireReadableStreamBYOBReader(stream);\n      forwardReaderError(reader);\n    }\n\n    const byobBranch = forBranch2 ? branch2 : branch1;\n    const otherBranch = forBranch2 ? branch1 : branch2;\n\n    const readIntoRequest: ReadIntoRequest<ArrayBufferView> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgainForBranch1 = false;\n          readAgainForBranch2 = false;\n\n          const byobCanceled = forBranch2 ? canceled2 : canceled1;\n          const otherCanceled = forBranch2 ? canceled1 : canceled2;\n\n          if (!otherCanceled) {\n            let clonedChunk;\n            try {\n              clonedChunk = CloneAsUint8Array(chunk);\n            } catch (cloneE) {\n              ReadableByteStreamControllerError(byobBranch._readableStreamController, cloneE);\n              ReadableByteStreamControllerError(otherBranch._readableStreamController, cloneE);\n              resolveCancelPromise(ReadableStreamCancel(stream, cloneE));\n              return;\n            }\n            if (!byobCanceled) {\n              ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n            }\n            ReadableByteStreamControllerEnqueue(otherBranch._readableStreamController, clonedChunk);\n          } else if (!byobCanceled) {\n            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n          }\n\n          reading = false;\n          if (readAgainForBranch1) {\n            pull1Algorithm();\n          } else if (readAgainForBranch2) {\n            pull2Algorithm();\n          }\n        });\n      },\n      _closeSteps: chunk => {\n        reading = false;\n\n        const byobCanceled = forBranch2 ? canceled2 : canceled1;\n        const otherCanceled = forBranch2 ? canceled1 : canceled2;\n\n        if (!byobCanceled) {\n          ReadableByteStreamControllerClose(byobBranch._readableStreamController);\n        }\n        if (!otherCanceled) {\n          ReadableByteStreamControllerClose(otherBranch._readableStreamController);\n        }\n\n        if (chunk !== undefined) {\n          assert(chunk.byteLength === 0);\n\n          if (!byobCanceled) {\n            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n          }\n          if (!otherCanceled && otherBranch._readableStreamController._pendingPullIntos.length > 0) {\n            ReadableByteStreamControllerRespond(otherBranch._readableStreamController, 0);\n          }\n        }\n\n        if (!byobCanceled || !otherCanceled) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamBYOBReaderRead(reader, view, readIntoRequest);\n  }\n\n  function pull1Algorithm(): Promise<void> {\n    if (reading) {\n      readAgainForBranch1 = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch1._readableStreamController);\n    if (byobRequest === null) {\n      pullWithDefaultReader();\n    } else {\n      pullWithBYOBReader(byobRequest._view!, false);\n    }\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function pull2Algorithm(): Promise<void> {\n    if (reading) {\n      readAgainForBranch2 = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch2._readableStreamController);\n    if (byobRequest === null) {\n      pullWithDefaultReader();\n    } else {\n      pullWithBYOBReader(byobRequest._view!, true);\n    }\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function cancel1Algorithm(reason: any): Promise<void> {\n    canceled1 = true;\n    reason1 = reason;\n    if (canceled2) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function cancel2Algorithm(reason: any): Promise<void> {\n    canceled2 = true;\n    reason2 = reason;\n    if (canceled1) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function startAlgorithm(): void {\n    return;\n  }\n\n  branch1 = CreateReadableByteStream(startAlgorithm, pull1Algorithm, cancel1Algorithm);\n  branch2 = CreateReadableByteStream(startAlgorithm, pull2Algorithm, cancel2Algorithm);\n\n  forwardReaderError(reader);\n\n  return [branch1, branch2];\n}\n","import { assertDictionary, assertFunction, convertUnsignedLongLongWithEnforceRange } from './basic';\nimport {\n  ReadableStreamController,\n  UnderlyingByteSource,\n  UnderlyingDefaultOrByteSource,\n  UnderlyingDefaultOrByteSourcePullCallback,\n  UnderlyingDefaultOrByteSourceStartCallback,\n  UnderlyingSource,\n  UnderlyingSourceCancelCallback,\n  ValidatedUnderlyingDefaultOrByteSource\n} from '../readable-stream/underlying-source';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\n\nexport function convertUnderlyingDefaultOrByteSource<R>(\n  source: UnderlyingSource<R> | UnderlyingByteSource | null,\n  context: string\n): ValidatedUnderlyingDefaultOrByteSource<R> {\n  assertDictionary(source, context);\n  const original = source as (UnderlyingDefaultOrByteSource<R> | null);\n  const autoAllocateChunkSize = original?.autoAllocateChunkSize;\n  const cancel = original?.cancel;\n  const pull = original?.pull;\n  const start = original?.start;\n  const type = original?.type;\n  return {\n    autoAllocateChunkSize: autoAllocateChunkSize === undefined ?\n      undefined :\n      convertUnsignedLongLongWithEnforceRange(\n        autoAllocateChunkSize,\n        `${context} has member 'autoAllocateChunkSize' that`\n      ),\n    cancel: cancel === undefined ?\n      undefined :\n      convertUnderlyingSourceCancelCallback(cancel, original!, `${context} has member 'cancel' that`),\n    pull: pull === undefined ?\n      undefined :\n      convertUnderlyingSourcePullCallback(pull, original!, `${context} has member 'pull' that`),\n    start: start === undefined ?\n      undefined :\n      convertUnderlyingSourceStartCallback(start, original!, `${context} has member 'start' that`),\n    type: type === undefined ? undefined : convertReadableStreamType(type, `${context} has member 'type' that`)\n  };\n}\n\nfunction convertUnderlyingSourceCancelCallback(\n  fn: UnderlyingSourceCancelCallback,\n  original: UnderlyingDefaultOrByteSource,\n  context: string\n): (reason: any) => Promise<void> {\n  assertFunction(fn, context);\n  return (reason: any) => promiseCall(fn, original, [reason]);\n}\n\nfunction convertUnderlyingSourcePullCallback<R>(\n  fn: UnderlyingDefaultOrByteSourcePullCallback<R>,\n  original: UnderlyingDefaultOrByteSource<R>,\n  context: string\n): (controller: ReadableStreamController<R>) => Promise<void> {\n  assertFunction(fn, context);\n  return (controller: ReadableStreamController<R>) => promiseCall(fn, original, [controller]);\n}\n\nfunction convertUnderlyingSourceStartCallback<R>(\n  fn: UnderlyingDefaultOrByteSourceStartCallback<R>,\n  original: UnderlyingDefaultOrByteSource<R>,\n  context: string\n): UnderlyingDefaultOrByteSourceStartCallback<R> {\n  assertFunction(fn, context);\n  return (controller: ReadableStreamController<R>) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertReadableStreamType(type: string, context: string): 'bytes' {\n  type = `${type}`;\n  if (type !== 'bytes') {\n    throw new TypeError(`${context} '${type}' is not a valid enumeration value for ReadableStreamType`);\n  }\n  return type;\n}\n","import { assertDictionary } from './basic';\nimport { ReadableStreamGetReaderOptions } from '../readable-stream/reader-options';\n\nexport function convertReaderOptions(options: ReadableStreamGetReaderOptions | null | undefined,\n                                     context: string): ReadableStreamGetReaderOptions {\n  assertDictionary(options, context);\n  const mode = options?.mode;\n  return {\n    mode: mode === undefined ? undefined : convertReadableStreamReaderMode(mode, `${context} has member 'mode' that`)\n  };\n}\n\nfunction convertReadableStreamReaderMode(mode: string, context: string): 'byob' {\n  mode = `${mode}`;\n  if (mode !== 'byob') {\n    throw new TypeError(`${context} '${mode}' is not a valid enumeration value for ReadableStreamReaderMode`);\n  }\n  return mode;\n}\n","import { assertDictionary } from './basic';\nimport {\n  ReadableStreamIteratorOptions,\n  ValidatedReadableStreamIteratorOptions\n} from '../readable-stream/iterator-options';\n\nexport function convertIteratorOptions(options: ReadableStreamIteratorOptions | null | undefined,\n                                       context: string): ValidatedReadableStreamIteratorOptions {\n  assertDictionary(options, context);\n  const preventCancel = options?.preventCancel;\n  return { preventCancel: Boolean(preventCancel) };\n}\n","import { assertDictionary } from './basic';\nimport { StreamPipeOptions, ValidatedStreamPipeOptions } from '../readable-stream/pipe-options';\nimport { AbortSignal, isAbortSignal } from '../abort-signal';\n\nexport function convertPipeOptions(options: StreamPipeOptions | null | undefined,\n                                   context: string): ValidatedStreamPipeOptions {\n  assertDictionary(options, context);\n  const preventAbort = options?.preventAbort;\n  const preventCancel = options?.preventCancel;\n  const preventClose = options?.preventClose;\n  const signal = options?.signal;\n  if (signal !== undefined) {\n    assertAbortSignal(signal, `${context} has member 'signal' that`);\n  }\n  return {\n    preventAbort: Boolean(preventAbort),\n    preventCancel: Boolean(preventCancel),\n    preventClose: Boolean(preventClose),\n    signal\n  };\n}\n\nfunction assertAbortSignal(signal: unknown, context: string): asserts signal is AbortSignal {\n  if (!isAbortSignal(signal)) {\n    throw new TypeError(`${context} is not an AbortSignal.`);\n  }\n}\n","import { assertDictionary, assertRequiredField } from './basic';\nimport { ReadableStream } from '../readable-stream';\nimport { WritableStream } from '../writable-stream';\nimport { assertReadableStream } from './readable-stream';\nimport { assertWritableStream } from './writable-stream';\n\nexport function convertReadableWritablePair<RS extends ReadableStream, WS extends WritableStream>(\n  pair: { readable: RS; writable: WS } | null | undefined,\n  context: string\n): { readable: RS; writable: WS } {\n  assertDictionary(pair, context);\n\n  const readable = pair?.readable;\n  assertRequiredField(readable, 'readable', 'ReadableWritablePair');\n  assertReadableStream(readable, `${context} has member 'readable' that`);\n\n  const writable = pair?.writable;\n  assertRequiredField(writable, 'writable', 'ReadableWritablePair');\n  assertWritableStream(writable, `${context} has member 'writable' that`);\n\n  return { readable, writable };\n}\n","import assert from '../stub/assert';\nimport {\n  promiseRejectedWith,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  transformPromiseWith\n} from './helpers/webidl';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { AcquireReadableStreamAsyncIterator, ReadableStreamAsyncIterator } from './readable-stream/async-iterator';\nimport { defaultReaderClosedPromiseReject, defaultReaderClosedPromiseResolve } from './readable-stream/generic-reader';\nimport {\n  AcquireReadableStreamDefaultReader,\n  IsReadableStreamDefaultReader,\n  ReadableStreamDefaultReader,\n  ReadableStreamDefaultReadResult\n} from './readable-stream/default-reader';\nimport {\n  AcquireReadableStreamBYOBReader,\n  IsReadableStreamBYOBReader,\n  ReadableStreamBYOBReader,\n  ReadableStreamBYOBReadResult\n} from './readable-stream/byob-reader';\nimport { ReadableStreamPipeTo } from './readable-stream/pipe';\nimport { ReadableStreamTee } from './readable-stream/tee';\nimport { IsWritableStream, IsWritableStreamLocked, WritableStream } from './writable-stream';\nimport { SimpleQueue } from './simple-queue';\nimport {\n  ReadableByteStreamController,\n  ReadableStreamBYOBRequest,\n  SetUpReadableByteStreamController,\n  SetUpReadableByteStreamControllerFromUnderlyingSource\n} from './readable-stream/byte-stream-controller';\nimport {\n  ReadableStreamDefaultController,\n  SetUpReadableStreamDefaultController,\n  SetUpReadableStreamDefaultControllerFromUnderlyingSource\n} from './readable-stream/default-controller';\nimport {\n  UnderlyingByteSource,\n  UnderlyingByteSourcePullCallback,\n  UnderlyingByteSourceStartCallback,\n  UnderlyingSource,\n  UnderlyingSourceCancelCallback,\n  UnderlyingSourcePullCallback,\n  UnderlyingSourceStartCallback\n} from './readable-stream/underlying-source';\nimport { noop } from '../utils';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { CreateArrayFromList } from './abstract-ops/ecmascript';\nimport { CancelSteps } from './abstract-ops/internal-methods';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { assertObject, assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport { convertUnderlyingDefaultOrByteSource } from './validators/underlying-source';\nimport { ReadableStreamGetReaderOptions } from './readable-stream/reader-options';\nimport { convertReaderOptions } from './validators/reader-options';\nimport { StreamPipeOptions, ValidatedStreamPipeOptions } from './readable-stream/pipe-options';\nimport { ReadableStreamIteratorOptions } from './readable-stream/iterator-options';\nimport { convertIteratorOptions } from './validators/iterator-options';\nimport { convertPipeOptions } from './validators/pipe-options';\nimport { ReadableWritablePair } from './readable-stream/readable-writable-pair';\nimport { convertReadableWritablePair } from './validators/readable-writable-pair';\n\nexport type ReadableByteStream = ReadableStream<Uint8Array> & {\n  _readableStreamController: ReadableByteStreamController\n};\n\ntype ReadableStreamState = 'readable' | 'closed' | 'errored';\n\n/**\n * A readable stream represents a source of data, from which you can read.\n *\n * @public\n */\nexport class ReadableStream<R = any> {\n  /** @internal */\n  _state!: ReadableStreamState;\n  /** @internal */\n  _reader: ReadableStreamReader<R> | undefined;\n  /** @internal */\n  _storedError: any;\n  /** @internal */\n  _disturbed!: boolean;\n  /** @internal */\n  _readableStreamController!: ReadableStreamDefaultController<R> | ReadableByteStreamController;\n\n  constructor(underlyingSource: UnderlyingByteSource, strategy?: { highWaterMark?: number; size?: undefined });\n  constructor(underlyingSource?: UnderlyingSource<R>, strategy?: QueuingStrategy<R>);\n  constructor(rawUnderlyingSource: UnderlyingSource<R> | UnderlyingByteSource | null | undefined = {},\n              rawStrategy: QueuingStrategy<R> | null | undefined = {}) {\n    if (rawUnderlyingSource === undefined) {\n      rawUnderlyingSource = null;\n    } else {\n      assertObject(rawUnderlyingSource, 'First parameter');\n    }\n\n    const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');\n    const underlyingSource = convertUnderlyingDefaultOrByteSource(rawUnderlyingSource, 'First parameter');\n\n    InitializeReadableStream(this);\n\n    if (underlyingSource.type === 'bytes') {\n      if (strategy.size !== undefined) {\n        throw new RangeError('The strategy for a byte stream cannot have a size function');\n      }\n      const highWaterMark = ExtractHighWaterMark(strategy, 0);\n      SetUpReadableByteStreamControllerFromUnderlyingSource(\n        this as unknown as ReadableByteStream,\n        underlyingSource,\n        highWaterMark\n      );\n    } else {\n      assert(underlyingSource.type === undefined);\n      const sizeAlgorithm = ExtractSizeAlgorithm(strategy);\n      const highWaterMark = ExtractHighWaterMark(strategy, 1);\n      SetUpReadableStreamDefaultControllerFromUnderlyingSource(\n        this,\n        underlyingSource,\n        highWaterMark,\n        sizeAlgorithm\n      );\n    }\n  }\n\n  /**\n   * Whether or not the readable stream is locked to a {@link ReadableStreamDefaultReader | reader}.\n   */\n  get locked(): boolean {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('locked');\n    }\n\n    return IsReadableStreamLocked(this);\n  }\n\n  /**\n   * Cancels the stream, signaling a loss of interest in the stream by a consumer.\n   *\n   * The supplied `reason` argument will be given to the underlying source's {@link UnderlyingSource.cancel | cancel()}\n   * method, which might or might not use it.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('cancel'));\n    }\n\n    if (IsReadableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot cancel a stream that already has a reader'));\n    }\n\n    return ReadableStreamCancel(this, reason);\n  }\n\n  /**\n   * Creates a {@link ReadableStreamBYOBReader} and locks the stream to the new reader.\n   *\n   * This call behaves the same way as the no-argument variant, except that it only works on readable byte streams,\n   * i.e. streams which were constructed specifically with the ability to handle \"bring your own buffer\" reading.\n   * The returned BYOB reader provides the ability to directly read individual chunks from the stream via its\n   * {@link ReadableStreamBYOBReader.read | read()} method, into developer-supplied buffers, allowing more precise\n   * control over allocation.\n   */\n  getReader({ mode }: { mode: 'byob' }): ReadableStreamBYOBReader;\n  /**\n   * Creates a {@link ReadableStreamDefaultReader} and locks the stream to the new reader.\n   * While the stream is locked, no other reader can be acquired until this one is released.\n   *\n   * This functionality is especially useful for creating abstractions that desire the ability to consume a stream\n   * in its entirety. By getting a reader for the stream, you can ensure nobody else can interleave reads with yours\n   * or cancel the stream, which would interfere with your abstraction.\n   */\n  getReader(): ReadableStreamDefaultReader<R>;\n  getReader(\n    rawOptions: ReadableStreamGetReaderOptions | null | undefined = undefined\n  ): ReadableStreamDefaultReader<R> | ReadableStreamBYOBReader {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('getReader');\n    }\n\n    const options = convertReaderOptions(rawOptions, 'First parameter');\n\n    if (options.mode === undefined) {\n      return AcquireReadableStreamDefaultReader(this);\n    }\n\n    assert(options.mode === 'byob');\n    return AcquireReadableStreamBYOBReader(this as unknown as ReadableByteStream);\n  }\n\n  /**\n   * Provides a convenient, chainable way of piping this readable stream through a transform stream\n   * (or any other `{ writable, readable }` pair). It simply {@link ReadableStream.pipeTo | pipes} the stream\n   * into the writable side of the supplied pair, and returns the readable side for further use.\n   *\n   * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.\n   */\n  pipeThrough<RS extends ReadableStream>(\n    transform: { readable: RS; writable: WritableStream<R> },\n    options?: StreamPipeOptions\n  ): RS;\n  pipeThrough<RS extends ReadableStream>(\n    rawTransform: { readable: RS; writable: WritableStream<R> } | null | undefined,\n    rawOptions: StreamPipeOptions | null | undefined = {}\n  ): RS {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('pipeThrough');\n    }\n    assertRequiredArgument(rawTransform, 1, 'pipeThrough');\n\n    const transform = convertReadableWritablePair(rawTransform, 'First parameter');\n    const options = convertPipeOptions(rawOptions, 'Second parameter');\n\n    if (IsReadableStreamLocked(this)) {\n      throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked ReadableStream');\n    }\n    if (IsWritableStreamLocked(transform.writable)) {\n      throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked WritableStream');\n    }\n\n    const promise = ReadableStreamPipeTo(\n      this, transform.writable, options.preventClose, options.preventAbort, options.preventCancel, options.signal\n    );\n\n    setPromiseIsHandledToTrue(promise);\n\n    return transform.readable;\n  }\n\n  /**\n   * Pipes this readable stream to a given writable stream. The way in which the piping process behaves under\n   * various error conditions can be customized with a number of passed options. It returns a promise that fulfills\n   * when the piping process completes successfully, or rejects if any errors were encountered.\n   *\n   * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.\n   */\n  pipeTo(destination: WritableStream<R>, options?: StreamPipeOptions): Promise<void>;\n  pipeTo(destination: WritableStream<R> | null | undefined,\n         rawOptions: StreamPipeOptions | null | undefined = {}): Promise<void> {\n    if (!IsReadableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('pipeTo'));\n    }\n\n    if (destination === undefined) {\n      return promiseRejectedWith(`Parameter 1 is required in 'pipeTo'.`);\n    }\n    if (!IsWritableStream(destination)) {\n      return promiseRejectedWith(\n        new TypeError(`ReadableStream.prototype.pipeTo's first argument must be a WritableStream`)\n      );\n    }\n\n    let options: ValidatedStreamPipeOptions;\n    try {\n      options = convertPipeOptions(rawOptions, 'Second parameter');\n    } catch (e) {\n      return promiseRejectedWith(e);\n    }\n\n    if (IsReadableStreamLocked(this)) {\n      return promiseRejectedWith(\n        new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream')\n      );\n    }\n    if (IsWritableStreamLocked(destination)) {\n      return promiseRejectedWith(\n        new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream')\n      );\n    }\n\n    return ReadableStreamPipeTo<R>(\n      this, destination, options.preventClose, options.preventAbort, options.preventCancel, options.signal\n    );\n  }\n\n  /**\n   * Tees this readable stream, returning a two-element array containing the two resulting branches as\n   * new {@link ReadableStream} instances.\n   *\n   * Teeing a stream will lock it, preventing any other consumer from acquiring a reader.\n   * To cancel the stream, cancel both of the resulting branches; a composite cancellation reason will then be\n   * propagated to the stream's underlying source.\n   *\n   * Note that the chunks seen in each branch will be the same object. If the chunks are not immutable,\n   * this could allow interference between the two branches.\n   */\n  tee(): [ReadableStream<R>, ReadableStream<R>] {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('tee');\n    }\n\n    const branches = ReadableStreamTee(this, false);\n    return CreateArrayFromList(branches);\n  }\n\n  /**\n   * Asynchronously iterates over the chunks in the stream's internal queue.\n   *\n   * Asynchronously iterating over the stream will lock it, preventing any other consumer from acquiring a reader.\n   * The lock will be released if the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method\n   * is called, e.g. by breaking out of the loop.\n   *\n   * By default, calling the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method will also\n   * cancel the stream. To prevent this, use the stream's {@link ReadableStream.values | values()} method, passing\n   * `true` for the `preventCancel` option.\n   */\n  values(options?: ReadableStreamIteratorOptions): ReadableStreamAsyncIterator<R>;\n  values(rawOptions: ReadableStreamIteratorOptions | null | undefined = undefined): ReadableStreamAsyncIterator<R> {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('values');\n    }\n\n    const options = convertIteratorOptions(rawOptions, 'First parameter');\n    return AcquireReadableStreamAsyncIterator<R>(this, options.preventCancel);\n  }\n\n  /**\n   * {@inheritDoc ReadableStream.values}\n   */\n  [Symbol.asyncIterator]: (options?: ReadableStreamIteratorOptions) => ReadableStreamAsyncIterator<R>;\n}\n\nObject.defineProperties(ReadableStream.prototype, {\n  cancel: { enumerable: true },\n  getReader: { enumerable: true },\n  pipeThrough: { enumerable: true },\n  pipeTo: { enumerable: true },\n  tee: { enumerable: true },\n  values: { enumerable: true },\n  locked: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStream.prototype, Symbol.toStringTag, {\n    value: 'ReadableStream',\n    configurable: true\n  });\n}\nif (typeof Symbol.asyncIterator === 'symbol') {\n  Object.defineProperty(ReadableStream.prototype, Symbol.asyncIterator, {\n    value: ReadableStream.prototype.values,\n    writable: true,\n    configurable: true\n  });\n}\n\nexport {\n  ReadableStreamAsyncIterator,\n  ReadableStreamDefaultReadResult,\n  ReadableStreamBYOBReadResult,\n  UnderlyingByteSource,\n  UnderlyingSource,\n  UnderlyingSourceStartCallback,\n  UnderlyingSourcePullCallback,\n  UnderlyingSourceCancelCallback,\n  UnderlyingByteSourceStartCallback,\n  UnderlyingByteSourcePullCallback,\n  StreamPipeOptions,\n  ReadableWritablePair,\n  ReadableStreamIteratorOptions\n};\n\n// Abstract operations for the ReadableStream.\n\n// Throws if and only if startAlgorithm throws.\nexport function CreateReadableStream<R>(startAlgorithm: () => void | PromiseLike<void>,\n                                        pullAlgorithm: () => Promise<void>,\n                                        cancelAlgorithm: (reason: any) => Promise<void>,\n                                        highWaterMark = 1,\n                                        sizeAlgorithm: QueuingStrategySizeCallback<R> = () => 1): ReadableStream<R> {\n  assert(IsNonNegativeNumber(highWaterMark));\n\n  const stream: ReadableStream<R> = Object.create(ReadableStream.prototype);\n  InitializeReadableStream(stream);\n\n  const controller: ReadableStreamDefaultController<R> = Object.create(ReadableStreamDefaultController.prototype);\n  SetUpReadableStreamDefaultController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm\n  );\n\n  return stream;\n}\n\n// Throws if and only if startAlgorithm throws.\nexport function CreateReadableByteStream(\n  startAlgorithm: () => void | PromiseLike<void>,\n  pullAlgorithm: () => Promise<void>,\n  cancelAlgorithm: (reason: any) => Promise<void>\n): ReadableByteStream {\n  const stream: ReadableByteStream = Object.create(ReadableStream.prototype);\n  InitializeReadableStream(stream);\n\n  const controller: ReadableByteStreamController = Object.create(ReadableByteStreamController.prototype);\n  SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, 0, undefined);\n\n  return stream;\n}\n\nfunction InitializeReadableStream(stream: ReadableStream) {\n  stream._state = 'readable';\n  stream._reader = undefined;\n  stream._storedError = undefined;\n  stream._disturbed = false;\n}\n\nexport function IsReadableStream(x: unknown): x is ReadableStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readableStreamController')) {\n    return false;\n  }\n\n  return x instanceof ReadableStream;\n}\n\nexport function IsReadableStreamDisturbed(stream: ReadableStream): boolean {\n  assert(IsReadableStream(stream));\n\n  return stream._disturbed;\n}\n\nexport function IsReadableStreamLocked(stream: ReadableStream): boolean {\n  assert(IsReadableStream(stream));\n\n  if (stream._reader === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamCancel<R>(stream: ReadableStream<R>, reason: any): Promise<undefined> {\n  stream._disturbed = true;\n\n  if (stream._state === 'closed') {\n    return promiseResolvedWith(undefined);\n  }\n  if (stream._state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  ReadableStreamClose(stream);\n\n  const reader = stream._reader;\n  if (reader !== undefined && IsReadableStreamBYOBReader(reader)) {\n    reader._readIntoRequests.forEach(readIntoRequest => {\n      readIntoRequest._closeSteps(undefined);\n    });\n    reader._readIntoRequests = new SimpleQueue();\n  }\n\n  const sourceCancelPromise = stream._readableStreamController[CancelSteps](reason);\n  return transformPromiseWith(sourceCancelPromise, noop);\n}\n\nexport function ReadableStreamClose<R>(stream: ReadableStream<R>): void {\n  assert(stream._state === 'readable');\n\n  stream._state = 'closed';\n\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return;\n  }\n\n  defaultReaderClosedPromiseResolve(reader);\n\n  if (IsReadableStreamDefaultReader<R>(reader)) {\n    reader._readRequests.forEach(readRequest => {\n      readRequest._closeSteps();\n    });\n    reader._readRequests = new SimpleQueue();\n  }\n}\n\nexport function ReadableStreamError<R>(stream: ReadableStream<R>, e: any): void {\n  assert(IsReadableStream(stream));\n  assert(stream._state === 'readable');\n\n  stream._state = 'errored';\n  stream._storedError = e;\n\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return;\n  }\n\n  defaultReaderClosedPromiseReject(reader, e);\n\n  if (IsReadableStreamDefaultReader<R>(reader)) {\n    reader._readRequests.forEach(readRequest => {\n      readRequest._errorSteps(e);\n    });\n\n    reader._readRequests = new SimpleQueue();\n  } else {\n    assert(IsReadableStreamBYOBReader(reader));\n\n    reader._readIntoRequests.forEach(readIntoRequest => {\n      readIntoRequest._errorSteps(e);\n    });\n\n    reader._readIntoRequests = new SimpleQueue();\n  }\n}\n\n// Readers\n\nexport type ReadableStreamReader<R> = ReadableStreamDefaultReader<R> | ReadableStreamBYOBReader;\n\nexport {\n  ReadableStreamDefaultReader,\n  ReadableStreamBYOBReader\n};\n\n// Controllers\n\nexport {\n  ReadableStreamDefaultController,\n  ReadableStreamBYOBRequest,\n  ReadableByteStreamController\n};\n\n// Helper functions for the ReadableStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(`ReadableStream.prototype.${name} can only be used on a ReadableStream`);\n}\n","import { QueuingStrategyInit } from '../queuing-strategy';\nimport { assertDictionary, assertRequiredField, convertUnrestrictedDouble } from './basic';\n\nexport function convertQueuingStrategyInit(init: QueuingStrategyInit | null | undefined,\n                                           context: string): QueuingStrategyInit {\n  assertDictionary(init, context);\n  const highWaterMark = init?.highWaterMark;\n  assertRequiredField(highWaterMark, 'highWaterMark', 'QueuingStrategyInit');\n  return {\n    highWaterMark: convertUnrestrictedDouble(highWaterMark)\n  };\n}\n","import { QueuingStrategy, QueuingStrategyInit } from './queuing-strategy';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategyInit } from './validators/queuing-strategy-init';\n\n// The size function must not have a prototype property nor be a constructor\nconst byteLengthSizeFunction = (chunk: ArrayBufferView): number => {\n  return chunk.byteLength;\n};\ntry {\n  Object.defineProperty(byteLengthSizeFunction, 'name', {\n    value: 'size',\n    configurable: true\n  });\n} catch {\n  // This property is non-configurable in older browsers, so ignore if this throws.\n  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility\n}\n\n/**\n * A queuing strategy that counts the number of bytes in each chunk.\n *\n * @public\n */\nexport default class ByteLengthQueuingStrategy implements QueuingStrategy<ArrayBufferView> {\n  /** @internal */\n  readonly _byteLengthQueuingStrategyHighWaterMark: number;\n\n  constructor(options: QueuingStrategyInit) {\n    assertRequiredArgument(options, 1, 'ByteLengthQueuingStrategy');\n    options = convertQueuingStrategyInit(options, 'First parameter');\n    this._byteLengthQueuingStrategyHighWaterMark = options.highWaterMark;\n  }\n\n  /**\n   * Returns the high water mark provided to the constructor.\n   */\n  get highWaterMark(): number {\n    if (!IsByteLengthQueuingStrategy(this)) {\n      throw byteLengthBrandCheckException('highWaterMark');\n    }\n    return this._byteLengthQueuingStrategyHighWaterMark;\n  }\n\n  /**\n   * Measures the size of `chunk` by returning the value of its `byteLength` property.\n   */\n  get size(): (chunk: ArrayBufferView) => number {\n    if (!IsByteLengthQueuingStrategy(this)) {\n      throw byteLengthBrandCheckException('size');\n    }\n    return byteLengthSizeFunction;\n  }\n}\n\nObject.defineProperties(ByteLengthQueuingStrategy.prototype, {\n  highWaterMark: { enumerable: true },\n  size: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ByteLengthQueuingStrategy.prototype, Symbol.toStringTag, {\n    value: 'ByteLengthQueuingStrategy',\n    configurable: true\n  });\n}\n\n// Helper functions for the ByteLengthQueuingStrategy.\n\nfunction byteLengthBrandCheckException(name: string): TypeError {\n  return new TypeError(`ByteLengthQueuingStrategy.prototype.${name} can only be used on a ByteLengthQueuingStrategy`);\n}\n\nexport function IsByteLengthQueuingStrategy(x: any): x is ByteLengthQueuingStrategy {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_byteLengthQueuingStrategyHighWaterMark')) {\n    return false;\n  }\n\n  return x instanceof ByteLengthQueuingStrategy;\n}\n","import { QueuingStrategy, QueuingStrategyInit } from './queuing-strategy';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategyInit } from './validators/queuing-strategy-init';\n\n// The size function must not have a prototype property nor be a constructor\nconst countSizeFunction = (): 1 => {\n  return 1;\n};\ntry {\n  Object.defineProperty(countSizeFunction, 'name', {\n    value: 'size',\n    configurable: true\n  });\n} catch {\n  // This property is non-configurable in older browsers, so ignore if this throws.\n  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility\n}\n\n/**\n * A queuing strategy that counts the number of chunks.\n *\n * @public\n */\nexport default class CountQueuingStrategy implements QueuingStrategy<any> {\n  /** @internal */\n  readonly _countQueuingStrategyHighWaterMark!: number;\n\n  constructor(options: QueuingStrategyInit) {\n    assertRequiredArgument(options, 1, 'CountQueuingStrategy');\n    options = convertQueuingStrategyInit(options, 'First parameter');\n    this._countQueuingStrategyHighWaterMark = options.highWaterMark;\n  }\n\n  /**\n   * Returns the high water mark provided to the constructor.\n   */\n  get highWaterMark(): number {\n    if (!IsCountQueuingStrategy(this)) {\n      throw countBrandCheckException('highWaterMark');\n    }\n    return this._countQueuingStrategyHighWaterMark;\n  }\n\n  /**\n   * Measures the size of `chunk` by always returning 1.\n   * This ensures that the total queue size is a count of the number of chunks in the queue.\n   */\n  get size(): (chunk: any) => 1 {\n    if (!IsCountQueuingStrategy(this)) {\n      throw countBrandCheckException('size');\n    }\n    return countSizeFunction;\n  }\n}\n\nObject.defineProperties(CountQueuingStrategy.prototype, {\n  highWaterMark: { enumerable: true },\n  size: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(CountQueuingStrategy.prototype, Symbol.toStringTag, {\n    value: 'CountQueuingStrategy',\n    configurable: true\n  });\n}\n\n// Helper functions for the CountQueuingStrategy.\n\nfunction countBrandCheckException(name: string): TypeError {\n  return new TypeError(`CountQueuingStrategy.prototype.${name} can only be used on a CountQueuingStrategy`);\n}\n\nexport function IsCountQueuingStrategy(x: any): x is CountQueuingStrategy {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_countQueuingStrategyHighWaterMark')) {\n    return false;\n  }\n\n  return x instanceof CountQueuingStrategy;\n}\n","import { assertDictionary, assertFunction } from './basic';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\nimport {\n  Transformer,\n  TransformerFlushCallback,\n  TransformerStartCallback,\n  TransformerTransformCallback,\n  ValidatedTransformer\n} from '../transform-stream/transformer';\nimport { TransformStreamDefaultController } from '../transform-stream';\n\nexport function convertTransformer<I, O>(original: Transformer<I, O> | null,\n                                         context: string): ValidatedTransformer<I, O> {\n  assertDictionary(original, context);\n  const flush = original?.flush;\n  const readableType = original?.readableType;\n  const start = original?.start;\n  const transform = original?.transform;\n  const writableType = original?.writableType;\n  return {\n    flush: flush === undefined ?\n      undefined :\n      convertTransformerFlushCallback(flush, original!, `${context} has member 'flush' that`),\n    readableType,\n    start: start === undefined ?\n      undefined :\n      convertTransformerStartCallback(start, original!, `${context} has member 'start' that`),\n    transform: transform === undefined ?\n      undefined :\n      convertTransformerTransformCallback(transform, original!, `${context} has member 'transform' that`),\n    writableType\n  };\n}\n\nfunction convertTransformerFlushCallback<I, O>(\n  fn: TransformerFlushCallback<O>,\n  original: Transformer<I, O>,\n  context: string\n): (controller: TransformStreamDefaultController<O>) => Promise<void> {\n  assertFunction(fn, context);\n  return (controller: TransformStreamDefaultController<O>) => promiseCall(fn, original, [controller]);\n}\n\nfunction convertTransformerStartCallback<I, O>(\n  fn: TransformerStartCallback<O>,\n  original: Transformer<I, O>,\n  context: string\n): TransformerStartCallback<O> {\n  assertFunction(fn, context);\n  return (controller: TransformStreamDefaultController<O>) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertTransformerTransformCallback<I, O>(\n  fn: TransformerTransformCallback<I, O>,\n  original: Transformer<I, O>,\n  context: string\n): (chunk: I, controller: TransformStreamDefaultController<O>) => Promise<void> {\n  assertFunction(fn, context);\n  return (chunk: I, controller: TransformStreamDefaultController<O>) => promiseCall(fn, original, [chunk, controller]);\n}\n","import assert from '../stub/assert';\nimport { newPromise, promiseRejectedWith, promiseResolvedWith, transformPromiseWith } from './helpers/webidl';\nimport { CreateReadableStream, ReadableStream, ReadableStreamDefaultController } from './readable-stream';\nimport {\n  ReadableStreamDefaultControllerCanCloseOrEnqueue,\n  ReadableStreamDefaultControllerClose,\n  ReadableStreamDefaultControllerEnqueue,\n  ReadableStreamDefaultControllerError,\n  ReadableStreamDefaultControllerGetDesiredSize,\n  ReadableStreamDefaultControllerHasBackpressure\n} from './readable-stream/default-controller';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { CreateWritableStream, WritableStream, WritableStreamDefaultControllerErrorIfNeeded } from './writable-stream';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport {\n  Transformer,\n  TransformerFlushCallback,\n  TransformerStartCallback,\n  TransformerTransformCallback,\n  ValidatedTransformer\n} from './transform-stream/transformer';\nimport { convertTransformer } from './validators/transformer';\n\n// Class TransformStream\n\n/**\n * A transform stream consists of a pair of streams: a {@link WritableStream | writable stream},\n * known as its writable side, and a {@link ReadableStream | readable stream}, known as its readable side.\n * In a manner specific to the transform stream in question, writes to the writable side result in new data being\n * made available for reading from the readable side.\n *\n * @public\n */\nexport class TransformStream<I = any, O = any> {\n  /** @internal */\n  _writable!: WritableStream<I>;\n  /** @internal */\n  _readable!: ReadableStream<O>;\n  /** @internal */\n  _backpressure!: boolean;\n  /** @internal */\n  _backpressureChangePromise!: Promise<void>;\n  /** @internal */\n  _backpressureChangePromise_resolve!: () => void;\n  /** @internal */\n  _transformStreamController!: TransformStreamDefaultController<O>;\n\n  constructor(\n    transformer?: Transformer<I, O>,\n    writableStrategy?: QueuingStrategy<I>,\n    readableStrategy?: QueuingStrategy<O>\n  );\n  constructor(rawTransformer: Transformer<I, O> | null | undefined = {},\n              rawWritableStrategy: QueuingStrategy<I> | null | undefined = {},\n              rawReadableStrategy: QueuingStrategy<O> | null | undefined = {}) {\n    if (rawTransformer === undefined) {\n      rawTransformer = null;\n    }\n\n    const writableStrategy = convertQueuingStrategy(rawWritableStrategy, 'Second parameter');\n    const readableStrategy = convertQueuingStrategy(rawReadableStrategy, 'Third parameter');\n\n    const transformer = convertTransformer(rawTransformer, 'First parameter');\n    if (transformer.readableType !== undefined) {\n      throw new RangeError('Invalid readableType specified');\n    }\n    if (transformer.writableType !== undefined) {\n      throw new RangeError('Invalid writableType specified');\n    }\n\n    const readableHighWaterMark = ExtractHighWaterMark(readableStrategy, 0);\n    const readableSizeAlgorithm = ExtractSizeAlgorithm(readableStrategy);\n    const writableHighWaterMark = ExtractHighWaterMark(writableStrategy, 1);\n    const writableSizeAlgorithm = ExtractSizeAlgorithm(writableStrategy);\n\n    let startPromise_resolve!: (value: void | PromiseLike<void>) => void;\n    const startPromise = newPromise<void>(resolve => {\n      startPromise_resolve = resolve;\n    });\n\n    InitializeTransformStream(\n      this, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm\n    );\n    SetUpTransformStreamDefaultControllerFromTransformer(this, transformer);\n\n    if (transformer.start !== undefined) {\n      startPromise_resolve(transformer.start(this._transformStreamController));\n    } else {\n      startPromise_resolve(undefined);\n    }\n  }\n\n  /**\n   * The readable side of the transform stream.\n   */\n  get readable(): ReadableStream<O> {\n    if (!IsTransformStream(this)) {\n      throw streamBrandCheckException('readable');\n    }\n\n    return this._readable;\n  }\n\n  /**\n   * The writable side of the transform stream.\n   */\n  get writable(): WritableStream<I> {\n    if (!IsTransformStream(this)) {\n      throw streamBrandCheckException('writable');\n    }\n\n    return this._writable;\n  }\n}\n\nObject.defineProperties(TransformStream.prototype, {\n  readable: { enumerable: true },\n  writable: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(TransformStream.prototype, Symbol.toStringTag, {\n    value: 'TransformStream',\n    configurable: true\n  });\n}\n\nexport {\n  Transformer,\n  TransformerStartCallback,\n  TransformerFlushCallback,\n  TransformerTransformCallback\n};\n\n// Transform Stream Abstract Operations\n\nexport function CreateTransformStream<I, O>(startAlgorithm: () => void | PromiseLike<void>,\n                                            transformAlgorithm: (chunk: I) => Promise<void>,\n                                            flushAlgorithm: () => Promise<void>,\n                                            writableHighWaterMark = 1,\n                                            writableSizeAlgorithm: QueuingStrategySizeCallback<I> = () => 1,\n                                            readableHighWaterMark = 0,\n                                            readableSizeAlgorithm: QueuingStrategySizeCallback<O> = () => 1) {\n  assert(IsNonNegativeNumber(writableHighWaterMark));\n  assert(IsNonNegativeNumber(readableHighWaterMark));\n\n  const stream: TransformStream<I, O> = Object.create(TransformStream.prototype);\n\n  let startPromise_resolve!: (value: void | PromiseLike<void>) => void;\n  const startPromise = newPromise<void>(resolve => {\n    startPromise_resolve = resolve;\n  });\n\n  InitializeTransformStream(stream, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark,\n                            readableSizeAlgorithm);\n\n  const controller: TransformStreamDefaultController<O> = Object.create(TransformStreamDefaultController.prototype);\n\n  SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);\n\n  const startResult = startAlgorithm();\n  startPromise_resolve(startResult);\n  return stream;\n}\n\nfunction InitializeTransformStream<I, O>(stream: TransformStream<I, O>,\n                                         startPromise: Promise<void>,\n                                         writableHighWaterMark: number,\n                                         writableSizeAlgorithm: QueuingStrategySizeCallback<I>,\n                                         readableHighWaterMark: number,\n                                         readableSizeAlgorithm: QueuingStrategySizeCallback<O>) {\n  function startAlgorithm(): Promise<void> {\n    return startPromise;\n  }\n\n  function writeAlgorithm(chunk: I): Promise<void> {\n    return TransformStreamDefaultSinkWriteAlgorithm(stream, chunk);\n  }\n\n  function abortAlgorithm(reason: any): Promise<void> {\n    return TransformStreamDefaultSinkAbortAlgorithm(stream, reason);\n  }\n\n  function closeAlgorithm(): Promise<void> {\n    return TransformStreamDefaultSinkCloseAlgorithm(stream);\n  }\n\n  stream._writable = CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm,\n                                          writableHighWaterMark, writableSizeAlgorithm);\n\n  function pullAlgorithm(): Promise<void> {\n    return TransformStreamDefaultSourcePullAlgorithm(stream);\n  }\n\n  function cancelAlgorithm(reason: any): Promise<void> {\n    TransformStreamErrorWritableAndUnblockWrite(stream, reason);\n    return promiseResolvedWith(undefined);\n  }\n\n  stream._readable = CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, readableHighWaterMark,\n                                          readableSizeAlgorithm);\n\n  // The [[backpressure]] slot is set to undefined so that it can be initialised by TransformStreamSetBackpressure.\n  stream._backpressure = undefined!;\n  stream._backpressureChangePromise = undefined!;\n  stream._backpressureChangePromise_resolve = undefined!;\n  TransformStreamSetBackpressure(stream, true);\n\n  stream._transformStreamController = undefined!;\n}\n\nfunction IsTransformStream(x: unknown): x is TransformStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_transformStreamController')) {\n    return false;\n  }\n\n  return x instanceof TransformStream;\n}\n\n// This is a no-op if both sides are already errored.\nfunction TransformStreamError(stream: TransformStream, e: any) {\n  ReadableStreamDefaultControllerError(\n    stream._readable._readableStreamController as ReadableStreamDefaultController<any>,\n    e\n  );\n  TransformStreamErrorWritableAndUnblockWrite(stream, e);\n}\n\nfunction TransformStreamErrorWritableAndUnblockWrite(stream: TransformStream, e: any) {\n  TransformStreamDefaultControllerClearAlgorithms(stream._transformStreamController);\n  WritableStreamDefaultControllerErrorIfNeeded(stream._writable._writableStreamController, e);\n  if (stream._backpressure) {\n    // Pretend that pull() was called to permit any pending write() calls to complete. TransformStreamSetBackpressure()\n    // cannot be called from enqueue() or pull() once the ReadableStream is errored, so this will will be the final time\n    // _backpressure is set.\n    TransformStreamSetBackpressure(stream, false);\n  }\n}\n\nfunction TransformStreamSetBackpressure(stream: TransformStream, backpressure: boolean) {\n  // Passes also when called during construction.\n  assert(stream._backpressure !== backpressure);\n\n  if (stream._backpressureChangePromise !== undefined) {\n    stream._backpressureChangePromise_resolve();\n  }\n\n  stream._backpressureChangePromise = newPromise(resolve => {\n    stream._backpressureChangePromise_resolve = resolve;\n  });\n\n  stream._backpressure = backpressure;\n}\n\n// Class TransformStreamDefaultController\n\n/**\n * Allows control of the {@link ReadableStream} and {@link WritableStream} of the associated {@link TransformStream}.\n *\n * @public\n */\nexport class TransformStreamDefaultController<O> {\n  /** @internal */\n  _controlledTransformStream: TransformStream<any, O>;\n  /** @internal */\n  _transformAlgorithm: (chunk: any) => Promise<void>;\n  /** @internal */\n  _flushAlgorithm: () => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the desired size to fill the readable side’s internal queue. It can be negative, if the queue is over-full.\n   */\n  get desiredSize(): number | null {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('desiredSize');\n    }\n\n    const readableController = this._controlledTransformStream._readable._readableStreamController;\n    return ReadableStreamDefaultControllerGetDesiredSize(readableController as ReadableStreamDefaultController<O>);\n  }\n\n  /**\n   * Enqueues the given chunk `chunk` in the readable side of the controlled transform stream.\n   */\n  enqueue(chunk: O): void;\n  enqueue(chunk: O = undefined!): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('enqueue');\n    }\n\n    TransformStreamDefaultControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors both the readable side and the writable side of the controlled transform stream, making all future\n   * interactions with it fail with the given error `e`. Any chunks queued for transformation will be discarded.\n   */\n  error(reason: any = undefined): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n\n    TransformStreamDefaultControllerError(this, reason);\n  }\n\n  /**\n   * Closes the readable side and errors the writable side of the controlled transform stream. This is useful when the\n   * transformer only needs to consume a portion of the chunks written to the writable side.\n   */\n  terminate(): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('terminate');\n    }\n\n    TransformStreamDefaultControllerTerminate(this);\n  }\n}\n\nObject.defineProperties(TransformStreamDefaultController.prototype, {\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  terminate: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(TransformStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'TransformStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Transform Stream Default Controller Abstract Operations\n\nfunction IsTransformStreamDefaultController<O = any>(x: any): x is TransformStreamDefaultController<O> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledTransformStream')) {\n    return false;\n  }\n\n  return x instanceof TransformStreamDefaultController;\n}\n\nfunction SetUpTransformStreamDefaultController<I, O>(stream: TransformStream<I, O>,\n                                                     controller: TransformStreamDefaultController<O>,\n                                                     transformAlgorithm: (chunk: I) => Promise<void>,\n                                                     flushAlgorithm: () => Promise<void>) {\n  assert(IsTransformStream(stream));\n  assert(stream._transformStreamController === undefined);\n\n  controller._controlledTransformStream = stream;\n  stream._transformStreamController = controller;\n\n  controller._transformAlgorithm = transformAlgorithm;\n  controller._flushAlgorithm = flushAlgorithm;\n}\n\nfunction SetUpTransformStreamDefaultControllerFromTransformer<I, O>(stream: TransformStream<I, O>,\n                                     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TransformStreamDefaultController<any>) {\n  controller._transformAlgorithm = undefined!;\n  controller._flushAlgorithm = undefined!;\n}\n\nfunction TransformStreamDefaultControllerEnqueue<O>(controller: TransformStreamDefaultController<O>, chunk: O) {\n  const stream = controller._controlledTransformStream;\n  const readableController = stream._readable._readableStreamController as ReadableStreamDefaultController<O>;\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(readableController)) {\n    throw new TypeError('Readable side is not in a state that permits enqueue');\n  }\n\n  // We throttle transform invocations based on the backpressure of the ReadableStream, but we still\n  // accept TransformStreamDefaultControllerEnqueue() calls.\n\n  try {\n    ReadableStreamDefaultControllerEnqueue(readableController, chunk);\n  } catch (e) {\n    // This happens when readableStrategy.size() throws.\n    TransformStreamErrorWritableAndUnblockWrite(stream, e);\n\n    throw stream._readable._storedError;\n  }\n\n  const backpressure = ReadableStreamDefaultControllerHasBackpressure(readableController);\n  if (backpressure !== stream._backpressure) {\n    assert(backpressure);\n    TransformStreamSetBackpressure(stream, true);\n  }\n}\n\nfunction TransformStreamDefaultControllerError(controller: TransformStreamDefaultController<any>, e: any) {\n  TransformStreamError(controller._controlledTransformStream, e);\n}\n\nfunction TransformStreamDefaultControllerPerformTransform<I, O>(controller: TransformStreamDefaultController<O>,\n                                                                chunk: I) {\n  const transformPromise = controller._transformAlgorithm(chunk);\n  return transformPromiseWith(transformPromise, undefined, r => {\n    TransformStreamError(controller._controlledTransformStream, r);\n    throw r;\n  });\n}\n\nfunction TransformStreamDefaultControllerTerminate<O>(controller: TransformStreamDefaultController<O>) {\n  const stream = controller._controlledTransformStream;\n  const readableController = stream._readable._readableStreamController as ReadableStreamDefaultController<O>;\n\n  ReadableStreamDefaultControllerClose(readableController);\n\n  const error = new TypeError('TransformStream terminated');\n  TransformStreamErrorWritableAndUnblockWrite(stream, error);\n}\n\n// TransformStreamDefaultSink Algorithms\n\nfunction TransformStreamDefaultSinkWriteAlgorithm<I, O>(stream: TransformStream<I, O>, chunk: I): Promise<void> {\n  assert(stream._writable._state === 'writable');\n\n  const controller = stream._transformStreamController;\n\n  if (stream._backpressure) {\n    const backpressureChangePromise = stream._backpressureChangePromise;\n    assert(backpressureChangePromise !== undefined);\n    return transformPromiseWith(backpressureChangePromise, () => {\n      const writable = stream._writable;\n      const state = writable._state;\n      if (state === 'erroring') {\n        throw writable._storedError;\n   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\ No newline at end of file
diff --git a/node_modules/web-streams-polyfill/dist/ponyfill.mjs b/node_modules/web-streams-polyfill/dist/ponyfill.mjs
new file mode 100644
index 0000000..43820d6
--- /dev/null
+++ b/node_modules/web-streams-polyfill/dist/ponyfill.mjs
@@ -0,0 +1,4332 @@
+/**
+ * web-streams-polyfill v3.2.1
+ */
+/// <reference lib="es2015.symbol" />
+var SymbolPolyfill = typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol' ?
+    Symbol :
+    function (description) { return "Symbol(" + description + ")"; };
+
+/// <reference lib="dom" />
+function noop() {
+    return undefined;
+}
+function getGlobals() {
+    if (typeof self !== 'undefined') {
+        return self;
+    }
+    else if (typeof window !== 'undefined') {
+        return window;
+    }
+    else if (typeof global !== 'undefined') {
+        return global;
+    }
+    return undefined;
+}
+var globals = getGlobals();
+
+function typeIsObject(x) {
+    return (typeof x === 'object' && x !== null) || typeof x === 'function';
+}
+var rethrowAssertionErrorRejection = noop;
+
+var originalPromise = Promise;
+var originalPromiseThen = Promise.prototype.then;
+var originalPromiseResolve = Promise.resolve.bind(originalPromise);
+var originalPromiseReject = Promise.reject.bind(originalPromise);
+function newPromise(executor) {
+    return new originalPromise(executor);
+}
+function promiseResolvedWith(value) {
+    return originalPromiseResolve(value);
+}
+function promiseRejectedWith(reason) {
+    return originalPromiseReject(reason);
+}
+function PerformPromiseThen(promise, onFulfilled, onRejected) {
+    // There doesn't appear to be any way to correctly emulate the behaviour from JavaScript, so this is just an
+    // approximation.
+    return originalPromiseThen.call(promise, onFulfilled, onRejected);
+}
+function uponPromise(promise, onFulfilled, onRejected) {
+    PerformPromiseThen(PerformPromiseThen(promise, onFulfilled, onRejected), undefined, rethrowAssertionErrorRejection);
+}
+function uponFulfillment(promise, onFulfilled) {
+    uponPromise(promise, onFulfilled);
+}
+function uponRejection(promise, onRejected) {
+    uponPromise(promise, undefined, onRejected);
+}
+function transformPromiseWith(promise, fulfillmentHandler, rejectionHandler) {
+    return PerformPromiseThen(promise, fulfillmentHandler, rejectionHandler);
+}
+function setPromiseIsHandledToTrue(promise) {
+    PerformPromiseThen(promise, undefined, rethrowAssertionErrorRejection);
+}
+var queueMicrotask = (function () {
+    var globalQueueMicrotask = globals && globals.queueMicrotask;
+    if (typeof globalQueueMicrotask === 'function') {
+        return globalQueueMicrotask;
+    }
+    var resolvedPromise = promiseResolvedWith(undefined);
+    return function (fn) { return PerformPromiseThen(resolvedPromise, fn); };
+})();
+function reflectCall(F, V, args) {
+    if (typeof F !== 'function') {
+        throw new TypeError('Argument is not a function');
+    }
+    return Function.prototype.apply.call(F, V, args);
+}
+function promiseCall(F, V, args) {
+    try {
+        return promiseResolvedWith(reflectCall(F, V, args));
+    }
+    catch (value) {
+        return promiseRejectedWith(value);
+    }
+}
+
+// Original from Chromium
+// https://chromium.googlesource.com/chromium/src/+/0aee4434a4dba42a42abaea9bfbc0cd196a63bc1/third_party/blink/renderer/core/streams/SimpleQueue.js
+var QUEUE_MAX_ARRAY_SIZE = 16384;
+/**
+ * Simple queue structure.
+ *
+ * Avoids scalability issues with using a packed array directly by using
+ * multiple arrays in a linked list and keeping the array size bounded.
+ */
+var SimpleQueue = /** @class */ (function () {
+    function SimpleQueue() {
+        this._cursor = 0;
+        this._size = 0;
+        // _front and _back are always defined.
+        this._front = {
+            _elements: [],
+            _next: undefined
+        };
+        this._back = this._front;
+        // The cursor is used to avoid calling Array.shift().
+        // It contains the index of the front element of the array inside the
+        // front-most node. It is always in the range [0, QUEUE_MAX_ARRAY_SIZE).
+        this._cursor = 0;
+        // When there is only one node, size === elements.length - cursor.
+        this._size = 0;
+    }
+    Object.defineProperty(SimpleQueue.prototype, "length", {
+        get: function () {
+            return this._size;
+        },
+        enumerable: false,
+        configurable: true
+    });
+    // For exception safety, this method is structured in order:
+    // 1. Read state
+    // 2. Calculate required state mutations
+    // 3. Perform state mutations
+    SimpleQueue.prototype.push = function (element) {
+        var oldBack = this._back;
+        var newBack = oldBack;
+        if (oldBack._elements.length === QUEUE_MAX_ARRAY_SIZE - 1) {
+            newBack = {
+                _elements: [],
+                _next: undefined
+            };
+        }
+        // push() is the mutation most likely to throw an exception, so it
+        // goes first.
+        oldBack._elements.push(element);
+        if (newBack !== oldBack) {
+            this._back = newBack;
+            oldBack._next = newBack;
+        }
+        ++this._size;
+    };
+    // Like push(), shift() follows the read -> calculate -> mutate pattern for
+    // exception safety.
+    SimpleQueue.prototype.shift = function () { // must not be called on an empty queue
+        var oldFront = this._front;
+        var newFront = oldFront;
+        var oldCursor = this._cursor;
+        var newCursor = oldCursor + 1;
+        var elements = oldFront._elements;
+        var element = elements[oldCursor];
+        if (newCursor === QUEUE_MAX_ARRAY_SIZE) {
+            newFront = oldFront._next;
+            newCursor = 0;
+        }
+        // No mutations before this point.
+        --this._size;
+        this._cursor = newCursor;
+        if (oldFront !== newFront) {
+            this._front = newFront;
+        }
+        // Permit shifted element to be garbage collected.
+        elements[oldCursor] = undefined;
+        return element;
+    };
+    // The tricky thing about forEach() is that it can be called
+    // re-entrantly. The queue may be mutated inside the callback. It is easy to
+    // see that push() within the callback has no negative effects since the end
+    // of the queue is checked for on every iteration. If shift() is called
+    // repeatedly within the callback then the next iteration may return an
+    // element that has been removed. In this case the callback will be called
+    // with undefined values until we either "catch up" with elements that still
+    // exist or reach the back of the queue.
+    SimpleQueue.prototype.forEach = function (callback) {
+        var i = this._cursor;
+        var node = this._front;
+        var elements = node._elements;
+        while (i !== elements.length || node._next !== undefined) {
+            if (i === elements.length) {
+                node = node._next;
+                elements = node._elements;
+                i = 0;
+                if (elements.length === 0) {
+                    break;
+                }
+            }
+            callback(elements[i]);
+            ++i;
+        }
+    };
+    // Return the element that would be returned if shift() was called now,
+    // without modifying the queue.
+    SimpleQueue.prototype.peek = function () { // must not be called on an empty queue
+        var front = this._front;
+        var cursor = this._cursor;
+        return front._elements[cursor];
+    };
+    return SimpleQueue;
+}());
+
+function ReadableStreamReaderGenericInitialize(reader, stream) {
+    reader._ownerReadableStream = stream;
+    stream._reader = reader;
+    if (stream._state === 'readable') {
+        defaultReaderClosedPromiseInitialize(reader);
+    }
+    else if (stream._state === 'closed') {
+        defaultReaderClosedPromiseInitializeAsResolved(reader);
+    }
+    else {
+        defaultReaderClosedPromiseInitializeAsRejected(reader, stream._storedError);
+    }
+}
+// A client of ReadableStreamDefaultReader and ReadableStreamBYOBReader may use these functions directly to bypass state
+// check.
+function ReadableStreamReaderGenericCancel(reader, reason) {
+    var stream = reader._ownerReadableStream;
+    return ReadableStreamCancel(stream, reason);
+}
+function ReadableStreamReaderGenericRelease(reader) {
+    if (reader._ownerReadableStream._state === 'readable') {
+        defaultReaderClosedPromiseReject(reader, new TypeError("Reader was released and can no longer be used to monitor the stream's closedness"));
+    }
+    else {
+        defaultReaderClosedPromiseResetToRejected(reader, new TypeError("Reader was released and can no longer be used to monitor the stream's closedness"));
+    }
+    reader._ownerReadableStream._reader = undefined;
+    reader._ownerReadableStream = undefined;
+}
+// Helper functions for the readers.
+function readerLockException(name) {
+    return new TypeError('Cannot ' + name + ' a stream using a released reader');
+}
+// Helper functions for the ReadableStreamDefaultReader.
+function defaultReaderClosedPromiseInitialize(reader) {
+    reader._closedPromise = newPromise(function (resolve, reject) {
+        reader._closedPromise_resolve = resolve;
+        reader._closedPromise_reject = reject;
+    });
+}
+function defaultReaderClosedPromiseInitializeAsRejected(reader, reason) {
+    defaultReaderClosedPromiseInitialize(reader);
+    defaultReaderClosedPromiseReject(reader, reason);
+}
+function defaultReaderClosedPromiseInitializeAsResolved(reader) {
+    defaultReaderClosedPromiseInitialize(reader);
+    defaultReaderClosedPromiseResolve(reader);
+}
+function defaultReaderClosedPromiseReject(reader, reason) {
+    if (reader._closedPromise_reject === undefined) {
+        return;
+    }
+    setPromiseIsHandledToTrue(reader._closedPromise);
+    reader._closedPromise_reject(reason);
+    reader._closedPromise_resolve = undefined;
+    reader._closedPromise_reject = undefined;
+}
+function defaultReaderClosedPromiseResetToRejected(reader, reason) {
+    defaultReaderClosedPromiseInitializeAsRejected(reader, reason);
+}
+function defaultReaderClosedPromiseResolve(reader) {
+    if (reader._closedPromise_resolve === undefined) {
+        return;
+    }
+    reader._closedPromise_resolve(undefined);
+    reader._closedPromise_resolve = undefined;
+    reader._closedPromise_reject = undefined;
+}
+
+var AbortSteps = SymbolPolyfill('[[AbortSteps]]');
+var ErrorSteps = SymbolPolyfill('[[ErrorSteps]]');
+var CancelSteps = SymbolPolyfill('[[CancelSteps]]');
+var PullSteps = SymbolPolyfill('[[PullSteps]]');
+
+/// <reference lib="es2015.core" />
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite#Polyfill
+var NumberIsFinite = Number.isFinite || function (x) {
+    return typeof x === 'number' && isFinite(x);
+};
+
+/// <reference lib="es2015.core" />
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc#Polyfill
+var MathTrunc = Math.trunc || function (v) {
+    return v < 0 ? Math.ceil(v) : Math.floor(v);
+};
+
+// https://heycam.github.io/webidl/#idl-dictionaries
+function isDictionary(x) {
+    return typeof x === 'object' || typeof x === 'function';
+}
+function assertDictionary(obj, context) {
+    if (obj !== undefined && !isDictionary(obj)) {
+        throw new TypeError(context + " is not an object.");
+    }
+}
+// https://heycam.github.io/webidl/#idl-callback-functions
+function assertFunction(x, context) {
+    if (typeof x !== 'function') {
+        throw new TypeError(context + " is not a function.");
+    }
+}
+// https://heycam.github.io/webidl/#idl-object
+function isObject(x) {
+    return (typeof x === 'object' && x !== null) || typeof x === 'function';
+}
+function assertObject(x, context) {
+    if (!isObject(x)) {
+        throw new TypeError(context + " is not an object.");
+    }
+}
+function assertRequiredArgument(x, position, context) {
+    if (x === undefined) {
+        throw new TypeError("Parameter " + position + " is required in '" + context + "'.");
+    }
+}
+function assertRequiredField(x, field, context) {
+    if (x === undefined) {
+        throw new TypeError(field + " is required in '" + context + "'.");
+    }
+}
+// https://heycam.github.io/webidl/#idl-unrestricted-double
+function convertUnrestrictedDouble(value) {
+    return Number(value);
+}
+function censorNegativeZero(x) {
+    return x === 0 ? 0 : x;
+}
+function integerPart(x) {
+    return censorNegativeZero(MathTrunc(x));
+}
+// https://heycam.github.io/webidl/#idl-unsigned-long-long
+function convertUnsignedLongLongWithEnforceRange(value, context) {
+    var lowerBound = 0;
+    var upperBound = Number.MAX_SAFE_INTEGER;
+    var x = Number(value);
+    x = censorNegativeZero(x);
+    if (!NumberIsFinite(x)) {
+        throw new TypeError(context + " is not a finite number");
+    }
+    x = integerPart(x);
+    if (x < lowerBound || x > upperBound) {
+        throw new TypeError(context + " is outside the accepted range of " + lowerBound + " to " + upperBound + ", inclusive");
+    }
+    if (!NumberIsFinite(x) || x === 0) {
+        return 0;
+    }
+    // TODO Use BigInt if supported?
+    // let xBigInt = BigInt(integerPart(x));
+    // xBigInt = BigInt.asUintN(64, xBigInt);
+    // return Number(xBigInt);
+    return x;
+}
+
+function assertReadableStream(x, context) {
+    if (!IsReadableStream(x)) {
+        throw new TypeError(context + " is not a ReadableStream.");
+    }
+}
+
+// Abstract operations for the ReadableStream.
+function AcquireReadableStreamDefaultReader(stream) {
+    return new ReadableStreamDefaultReader(stream);
+}
+// ReadableStream API exposed for controllers.
+function ReadableStreamAddReadRequest(stream, readRequest) {
+    stream._reader._readRequests.push(readRequest);
+}
+function ReadableStreamFulfillReadRequest(stream, chunk, done) {
+    var reader = stream._reader;
+    var readRequest = reader._readRequests.shift();
+    if (done) {
+        readRequest._closeSteps();
+    }
+    else {
+        readRequest._chunkSteps(chunk);
+    }
+}
+function ReadableStreamGetNumReadRequests(stream) {
+    return stream._reader._readRequests.length;
+}
+function ReadableStreamHasDefaultReader(stream) {
+    var reader = stream._reader;
+    if (reader === undefined) {
+        return false;
+    }
+    if (!IsReadableStreamDefaultReader(reader)) {
+        return false;
+    }
+    return true;
+}
+/**
+ * A default reader vended by a {@link ReadableStream}.
+ *
+ * @public
+ */
+var ReadableStreamDefaultReader = /** @class */ (function () {
+    function ReadableStreamDefaultReader(stream) {
+        assertRequiredArgument(stream, 1, 'ReadableStreamDefaultReader');
+        assertReadableStream(stream, 'First parameter');
+        if (IsReadableStreamLocked(stream)) {
+            throw new TypeError('This stream has already been locked for exclusive reading by another reader');
+        }
+        ReadableStreamReaderGenericInitialize(this, stream);
+        this._readRequests = new SimpleQueue();
+    }
+    Object.defineProperty(ReadableStreamDefaultReader.prototype, "closed", {
+        /**
+         * Returns a promise that will be fulfilled when the stream becomes closed,
+         * or rejected if the stream ever errors or the reader's lock is released before the stream finishes closing.
+         */
+        get: function () {
+            if (!IsReadableStreamDefaultReader(this)) {
+                return promiseRejectedWith(defaultReaderBrandCheckException('closed'));
+            }
+            return this._closedPromise;
+        },
+        enumerable: false,
+        configurable: true
+    });
+    /**
+     * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.
+     */
+    ReadableStreamDefaultReader.prototype.cancel = function (reason) {
+        if (reason === void 0) { reason = undefined; }
+        if (!IsReadableStreamDefaultReader(this)) {
+            return promiseRejectedWith(defaultReaderBrandCheckException('cancel'));
+        }
+        if (this._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('cancel'));
+        }
+        return ReadableStreamReaderGenericCancel(this, reason);
+    };
+    /**
+     * Returns a promise that allows access to the next chunk from the stream's internal queue, if available.
+     *
+     * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.
+     */
+    ReadableStreamDefaultReader.prototype.read = function () {
+        if (!IsReadableStreamDefaultReader(this)) {
+            return promiseRejectedWith(defaultReaderBrandCheckException('read'));
+        }
+        if (this._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('read from'));
+        }
+        var resolvePromise;
+        var rejectPromise;
+        var promise = newPromise(function (resolve, reject) {
+            resolvePromise = resolve;
+            rejectPromise = reject;
+        });
+        var readRequest = {
+            _chunkSteps: function (chunk) { return resolvePromise({ value: chunk, done: false }); },
+            _closeSteps: function () { return resolvePromise({ value: undefined, done: true }); },
+            _errorSteps: function (e) { return rejectPromise(e); }
+        };
+        ReadableStreamDefaultReaderRead(this, readRequest);
+        return promise;
+    };
+    /**
+     * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.
+     * If the associated stream is errored when the lock is released, the reader will appear errored in the same way
+     * from now on; otherwise, the reader will appear closed.
+     *
+     * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by
+     * the reader's {@link ReadableStreamDefaultReader.read | read()} method has not yet been settled. Attempting to
+     * do so will throw a `TypeError` and leave the reader locked to the stream.
+     */
+    ReadableStreamDefaultReader.prototype.releaseLock = function () {
+        if (!IsReadableStreamDefaultReader(this)) {
+            throw defaultReaderBrandCheckException('releaseLock');
+        }
+        if (this._ownerReadableStream === undefined) {
+            return;
+        }
+        if (this._readRequests.length > 0) {
+            throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');
+        }
+        ReadableStreamReaderGenericRelease(this);
+    };
+    return ReadableStreamDefaultReader;
+}());
+Object.defineProperties(ReadableStreamDefaultReader.prototype, {
+    cancel: { enumerable: true },
+    read: { enumerable: true },
+    releaseLock: { enumerable: true },
+    closed: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableStreamDefaultReader.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableStreamDefaultReader',
+        configurable: true
+    });
+}
+// Abstract operations for the readers.
+function IsReadableStreamDefaultReader(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_readRequests')) {
+        return false;
+    }
+    return x instanceof ReadableStreamDefaultReader;
+}
+function ReadableStreamDefaultReaderRead(reader, readRequest) {
+    var stream = reader._ownerReadableStream;
+    stream._disturbed = true;
+    if (stream._state === 'closed') {
+        readRequest._closeSteps();
+    }
+    else if (stream._state === 'errored') {
+        readRequest._errorSteps(stream._storedError);
+    }
+    else {
+        stream._readableStreamController[PullSteps](readRequest);
+    }
+}
+// Helper functions for the ReadableStreamDefaultReader.
+function defaultReaderBrandCheckException(name) {
+    return new TypeError("ReadableStreamDefaultReader.prototype." + name + " can only be used on a ReadableStreamDefaultReader");
+}
+
+/// <reference lib="es2018.asynciterable" />
+var _a;
+var AsyncIteratorPrototype;
+if (typeof SymbolPolyfill.asyncIterator === 'symbol') {
+    // We're running inside a ES2018+ environment, but we're compiling to an older syntax.
+    // We cannot access %AsyncIteratorPrototype% without non-ES2018 syntax, but we can re-create it.
+    AsyncIteratorPrototype = (_a = {},
+        // 25.1.3.1 %AsyncIteratorPrototype% [ @@asyncIterator ] ( )
+        // https://tc39.github.io/ecma262/#sec-asynciteratorprototype-asynciterator
+        _a[SymbolPolyfill.asyncIterator] = function () {
+            return this;
+        },
+        _a);
+    Object.defineProperty(AsyncIteratorPrototype, SymbolPolyfill.asyncIterator, { enumerable: false });
+}
+
+/// <reference lib="es2018.asynciterable" />
+var ReadableStreamAsyncIteratorImpl = /** @class */ (function () {
+    function ReadableStreamAsyncIteratorImpl(reader, preventCancel) {
+        this._ongoingPromise = undefined;
+        this._isFinished = false;
+        this._reader = reader;
+        this._preventCancel = preventCancel;
+    }
+    ReadableStreamAsyncIteratorImpl.prototype.next = function () {
+        var _this = this;
+        var nextSteps = function () { return _this._nextSteps(); };
+        this._ongoingPromise = this._ongoingPromise ?
+            transformPromiseWith(this._ongoingPromise, nextSteps, nextSteps) :
+            nextSteps();
+        return this._ongoingPromise;
+    };
+    ReadableStreamAsyncIteratorImpl.prototype.return = function (value) {
+        var _this = this;
+        var returnSteps = function () { return _this._returnSteps(value); };
+        return this._ongoingPromise ?
+            transformPromiseWith(this._ongoingPromise, returnSteps, returnSteps) :
+            returnSteps();
+    };
+    ReadableStreamAsyncIteratorImpl.prototype._nextSteps = function () {
+        var _this = this;
+        if (this._isFinished) {
+            return Promise.resolve({ value: undefined, done: true });
+        }
+        var reader = this._reader;
+        if (reader._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('iterate'));
+        }
+        var resolvePromise;
+        var rejectPromise;
+        var promise = newPromise(function (resolve, reject) {
+            resolvePromise = resolve;
+            rejectPromise = reject;
+        });
+        var readRequest = {
+            _chunkSteps: function (chunk) {
+                _this._ongoingPromise = undefined;
+                // This needs to be delayed by one microtask, otherwise we stop pulling too early which breaks a test.
+                // FIXME Is this a bug in the specification, or in the test?
+                queueMicrotask(function () { return resolvePromise({ value: chunk, done: false }); });
+            },
+            _closeSteps: function () {
+                _this._ongoingPromise = undefined;
+                _this._isFinished = true;
+                ReadableStreamReaderGenericRelease(reader);
+                resolvePromise({ value: undefined, done: true });
+            },
+            _errorSteps: function (reason) {
+                _this._ongoingPromise = undefined;
+                _this._isFinished = true;
+                ReadableStreamReaderGenericRelease(reader);
+                rejectPromise(reason);
+            }
+        };
+        ReadableStreamDefaultReaderRead(reader, readRequest);
+        return promise;
+    };
+    ReadableStreamAsyncIteratorImpl.prototype._returnSteps = function (value) {
+        if (this._isFinished) {
+            return Promise.resolve({ value: value, done: true });
+        }
+        this._isFinished = true;
+        var reader = this._reader;
+        if (reader._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('finish iterating'));
+        }
+        if (!this._preventCancel) {
+            var result = ReadableStreamReaderGenericCancel(reader, value);
+            ReadableStreamReaderGenericRelease(reader);
+            return transformPromiseWith(result, function () { return ({ value: value, done: true }); });
+        }
+        ReadableStreamReaderGenericRelease(reader);
+        return promiseResolvedWith({ value: value, done: true });
+    };
+    return ReadableStreamAsyncIteratorImpl;
+}());
+var ReadableStreamAsyncIteratorPrototype = {
+    next: function () {
+        if (!IsReadableStreamAsyncIterator(this)) {
+            return promiseRejectedWith(streamAsyncIteratorBrandCheckException('next'));
+        }
+        return this._asyncIteratorImpl.next();
+    },
+    return: function (value) {
+        if (!IsReadableStreamAsyncIterator(this)) {
+            return promiseRejectedWith(streamAsyncIteratorBrandCheckException('return'));
+        }
+        return this._asyncIteratorImpl.return(value);
+    }
+};
+if (AsyncIteratorPrototype !== undefined) {
+    Object.setPrototypeOf(ReadableStreamAsyncIteratorPrototype, AsyncIteratorPrototype);
+}
+// Abstract operations for the ReadableStream.
+function AcquireReadableStreamAsyncIterator(stream, preventCancel) {
+    var reader = AcquireReadableStreamDefaultReader(stream);
+    var impl = new ReadableStreamAsyncIteratorImpl(reader, preventCancel);
+    var iterator = Object.create(ReadableStreamAsyncIteratorPrototype);
+    iterator._asyncIteratorImpl = impl;
+    return iterator;
+}
+function IsReadableStreamAsyncIterator(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_asyncIteratorImpl')) {
+        return false;
+    }
+    try {
+        // noinspection SuspiciousTypeOfGuard
+        return x._asyncIteratorImpl instanceof
+            ReadableStreamAsyncIteratorImpl;
+    }
+    catch (_a) {
+        return false;
+    }
+}
+// Helper functions for the ReadableStream.
+function streamAsyncIteratorBrandCheckException(name) {
+    return new TypeError("ReadableStreamAsyncIterator." + name + " can only be used on a ReadableSteamAsyncIterator");
+}
+
+/// <reference lib="es2015.core" />
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Polyfill
+var NumberIsNaN = Number.isNaN || function (x) {
+    // eslint-disable-next-line no-self-compare
+    return x !== x;
+};
+
+function CreateArrayFromList(elements) {
+    // We use arrays to represent lists, so this is basically a no-op.
+    // Do a slice though just in case we happen to depend on the unique-ness.
+    return elements.slice();
+}
+function CopyDataBlockBytes(dest, destOffset, src, srcOffset, n) {
+    new Uint8Array(dest).set(new Uint8Array(src, srcOffset, n), destOffset);
+}
+// Not implemented correctly
+function TransferArrayBuffer(O) {
+    return O;
+}
+// Not implemented correctly
+// eslint-disable-next-line @typescript-eslint/no-unused-vars
+function IsDetachedBuffer(O) {
+    return false;
+}
+function ArrayBufferSlice(buffer, begin, end) {
+    // ArrayBuffer.prototype.slice is not available on IE10
+    // https://www.caniuse.com/mdn-javascript_builtins_arraybuffer_slice
+    if (buffer.slice) {
+        return buffer.slice(begin, end);
+    }
+    var length = end - begin;
+    var slice = new ArrayBuffer(length);
+    CopyDataBlockBytes(slice, 0, buffer, begin, length);
+    return slice;
+}
+
+function IsNonNegativeNumber(v) {
+    if (typeof v !== 'number') {
+        return false;
+    }
+    if (NumberIsNaN(v)) {
+        return false;
+    }
+    if (v < 0) {
+        return false;
+    }
+    return true;
+}
+function CloneAsUint8Array(O) {
+    var buffer = ArrayBufferSlice(O.buffer, O.byteOffset, O.byteOffset + O.byteLength);
+    return new Uint8Array(buffer);
+}
+
+function DequeueValue(container) {
+    var pair = container._queue.shift();
+    container._queueTotalSize -= pair.size;
+    if (container._queueTotalSize < 0) {
+        container._queueTotalSize = 0;
+    }
+    return pair.value;
+}
+function EnqueueValueWithSize(container, value, size) {
+    if (!IsNonNegativeNumber(size) || size === Infinity) {
+        throw new RangeError('Size must be a finite, non-NaN, non-negative number.');
+    }
+    container._queue.push({ value: value, size: size });
+    container._queueTotalSize += size;
+}
+function PeekQueueValue(container) {
+    var pair = container._queue.peek();
+    return pair.value;
+}
+function ResetQueue(container) {
+    container._queue = new SimpleQueue();
+    container._queueTotalSize = 0;
+}
+
+/**
+ * A pull-into request in a {@link ReadableByteStreamController}.
+ *
+ * @public
+ */
+var ReadableStreamBYOBRequest = /** @class */ (function () {
+    function ReadableStreamBYOBRequest() {
+        throw new TypeError('Illegal constructor');
+    }
+    Object.defineProperty(ReadableStreamBYOBRequest.prototype, "view", {
+        /**
+         * Returns the view for writing in to, or `null` if the BYOB request has already been responded to.
+         */
+        get: function () {
+            if (!IsReadableStreamBYOBRequest(this)) {
+                throw byobRequestBrandCheckException('view');
+            }
+            return this._view;
+        },
+        enumerable: false,
+        configurable: true
+    });
+    ReadableStreamBYOBRequest.prototype.respond = function (bytesWritten) {
+        if (!IsReadableStreamBYOBRequest(this)) {
+            throw byobRequestBrandCheckException('respond');
+        }
+        assertRequiredArgument(bytesWritten, 1, 'respond');
+        bytesWritten = convertUnsignedLongLongWithEnforceRange(bytesWritten, 'First parameter');
+        if (this._associatedReadableByteStreamController === undefined) {
+            throw new TypeError('This BYOB request has been invalidated');
+        }
+        if (IsDetachedBuffer(this._view.buffer)) ;
+        ReadableByteStreamControllerRespond(this._associatedReadableByteStreamController, bytesWritten);
+    };
+    ReadableStreamBYOBRequest.prototype.respondWithNewView = function (view) {
+        if (!IsReadableStreamBYOBRequest(this)) {
+            throw byobRequestBrandCheckException('respondWithNewView');
+        }
+        assertRequiredArgument(view, 1, 'respondWithNewView');
+        if (!ArrayBuffer.isView(view)) {
+            throw new TypeError('You can only respond with array buffer views');
+        }
+        if (this._associatedReadableByteStreamController === undefined) {
+            throw new TypeError('This BYOB request has been invalidated');
+        }
+        if (IsDetachedBuffer(view.buffer)) ;
+        ReadableByteStreamControllerRespondWithNewView(this._associatedReadableByteStreamController, view);
+    };
+    return ReadableStreamBYOBRequest;
+}());
+Object.defineProperties(ReadableStreamBYOBRequest.prototype, {
+    respond: { enumerable: true },
+    respondWithNewView: { enumerable: true },
+    view: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableStreamBYOBRequest.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableStreamBYOBRequest',
+        configurable: true
+    });
+}
+/**
+ * Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue.
+ *
+ * @public
+ */
+var ReadableByteStreamController = /** @class */ (function () {
+    function ReadableByteStreamController() {
+        throw new TypeError('Illegal constructor');
+    }
+    Object.defineProperty(ReadableByteStreamController.prototype, "byobRequest", {
+        /**
+         * Returns the current BYOB pull request, or `null` if there isn't one.
+         */
+        get: function () {
+            if (!IsReadableByteStreamController(this)) {
+                throw byteStreamControllerBrandCheckException('byobRequest');
+            }
+            return ReadableByteStreamControllerGetBYOBRequest(this);
+        },
+        enumerable: false,
+        configurable: true
+    });
+    Object.defineProperty(ReadableByteStreamController.prototype, "desiredSize", {
+        /**
+         * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is
+         * over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure.
+         */
+        get: function () {
+            if (!IsReadableByteStreamController(this)) {
+                throw byteStreamControllerBrandCheckException('desiredSize');
+            }
+            return ReadableByteStreamControllerGetDesiredSize(this);
+        },
+        enumerable: false,
+        configurable: true
+    });
+    /**
+     * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from
+     * the stream, but once those are read, the stream will become closed.
+     */
+    ReadableByteStreamController.prototype.close = function () {
+        if (!IsReadableByteStreamController(this)) {
+            throw byteStreamControllerBrandCheckException('close');
+        }
+        if (this._closeRequested) {
+            throw new TypeError('The stream has already been closed; do not close it again!');
+        }
+        var state = this._controlledReadableByteStream._state;
+        if (state !== 'readable') {
+            throw new TypeError("The stream (in " + state + " state) is not in the readable state and cannot be closed");
+        }
+        ReadableByteStreamControllerClose(this);
+    };
+    ReadableByteStreamController.prototype.enqueue = function (chunk) {
+        if (!IsReadableByteStreamController(this)) {
+            throw byteStreamControllerBrandCheckException('enqueue');
+        }
+        assertRequiredArgument(chunk, 1, 'enqueue');
+        if (!ArrayBuffer.isView(chunk)) {
+            throw new TypeError('chunk must be an array buffer view');
+        }
+        if (chunk.byteLength === 0) {
+            throw new TypeError('chunk must have non-zero byteLength');
+        }
+        if (chunk.buffer.byteLength === 0) {
+            throw new TypeError("chunk's buffer must have non-zero byteLength");
+        }
+        if (this._closeRequested) {
+            throw new TypeError('stream is closed or draining');
+        }
+        var state = this._controlledReadableByteStream._state;
+        if (state !== 'readable') {
+            throw new TypeError("The stream (in " + state + " state) is not in the readable state and cannot be enqueued to");
+        }
+        ReadableByteStreamControllerEnqueue(this, chunk);
+    };
+    /**
+     * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.
+     */
+    ReadableByteStreamController.prototype.error = function (e) {
+        if (e === void 0) { e = undefined; }
+        if (!IsReadableByteStreamController(this)) {
+            throw byteStreamControllerBrandCheckException('error');
+        }
+        ReadableByteStreamControllerError(this, e);
+    };
+    /** @internal */
+    ReadableByteStreamController.prototype[CancelSteps] = function (reason) {
+        ReadableByteStreamControllerClearPendingPullIntos(this);
+        ResetQueue(this);
+        var result = this._cancelAlgorithm(reason);
+        ReadableByteStreamControllerClearAlgorithms(this);
+        return result;
+    };
+    /** @internal */
+    ReadableByteStreamController.prototype[PullSteps] = function (readRequest) {
+        var stream = this._controlledReadableByteStream;
+        if (this._queueTotalSize > 0) {
+            var entry = this._queue.shift();
+            this._queueTotalSize -= entry.byteLength;
+            ReadableByteStreamControllerHandleQueueDrain(this);
+            var view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);
+            readRequest._chunkSteps(view);
+            return;
+        }
+        var autoAllocateChunkSize = this._autoAllocateChunkSize;
+        if (autoAllocateChunkSize !== undefined) {
+            var buffer = void 0;
+            try {
+                buffer = new ArrayBuffer(autoAllocateChunkSize);
+            }
+            catch (bufferE) {
+                readRequest._errorSteps(bufferE);
+                return;
+            }
+            var pullIntoDescriptor = {
+                buffer: buffer,
+                bufferByteLength: autoAllocateChunkSize,
+                byteOffset: 0,
+                byteLength: autoAllocateChunkSize,
+                bytesFilled: 0,
+                elementSize: 1,
+                viewConstructor: Uint8Array,
+                readerType: 'default'
+            };
+            this._pendingPullIntos.push(pullIntoDescriptor);
+        }
+        ReadableStreamAddReadRequest(stream, readRequest);
+        ReadableByteStreamControllerCallPullIfNeeded(this);
+    };
+    return ReadableByteStreamController;
+}());
+Object.defineProperties(ReadableByteStreamController.prototype, {
+    close: { enumerable: true },
+    enqueue: { enumerable: true },
+    error: { enumerable: true },
+    byobRequest: { enumerable: true },
+    desiredSize: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableByteStreamController.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableByteStreamController',
+        configurable: true
+    });
+}
+// Abstract operations for the ReadableByteStreamController.
+function IsReadableByteStreamController(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableByteStream')) {
+        return false;
+    }
+    return x instanceof ReadableByteStreamController;
+}
+function IsReadableStreamBYOBRequest(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_associatedReadableByteStreamController')) {
+        return false;
+    }
+    return x instanceof ReadableStreamBYOBRequest;
+}
+function ReadableByteStreamControllerCallPullIfNeeded(controller) {
+    var shouldPull = ReadableByteStreamControllerShouldCallPull(controller);
+    if (!shouldPull) {
+        return;
+    }
+    if (controller._pulling) {
+        controller._pullAgain = true;
+        return;
+    }
+    controller._pulling = true;
+    // TODO: Test controller argument
+    var pullPromise = controller._pullAlgorithm();
+    uponPromise(pullPromise, function () {
+        controller._pulling = false;
+        if (controller._pullAgain) {
+            controller._pullAgain = false;
+            ReadableByteStreamControllerCallPullIfNeeded(controller);
+        }
+    }, function (e) {
+        ReadableByteStreamControllerError(controller, e);
+    });
+}
+function ReadableByteStreamControllerClearPendingPullIntos(controller) {
+    ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+    controller._pendingPullIntos = new SimpleQueue();
+}
+function ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor) {
+    var done = false;
+    if (stream._state === 'closed') {
+        done = true;
+    }
+    var filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor);
+    if (pullIntoDescriptor.readerType === 'default') {
+        ReadableStreamFulfillReadRequest(stream, filledView, done);
+    }
+    else {
+        ReadableStreamFulfillReadIntoRequest(stream, filledView, done);
+    }
+}
+function ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor) {
+    var bytesFilled = pullIntoDescriptor.bytesFilled;
+    var elementSize = pullIntoDescriptor.elementSize;
+    return new pullIntoDescriptor.viewConstructor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize);
+}
+function ReadableByteStreamControllerEnqueueChunkToQueue(controller, buffer, byteOffset, byteLength) {
+    controller._queue.push({ buffer: buffer, byteOffset: byteOffset, byteLength: byteLength });
+    controller._queueTotalSize += byteLength;
+}
+function ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor) {
+    var elementSize = pullIntoDescriptor.elementSize;
+    var currentAlignedBytes = pullIntoDescriptor.bytesFilled - pullIntoDescriptor.bytesFilled % elementSize;
+    var maxBytesToCopy = Math.min(controller._queueTotalSize, pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled);
+    var maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;
+    var maxAlignedBytes = maxBytesFilled - maxBytesFilled % elementSize;
+    var totalBytesToCopyRemaining = maxBytesToCopy;
+    var ready = false;
+    if (maxAlignedBytes > currentAlignedBytes) {
+        totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled;
+        ready = true;
+    }
+    var queue = controller._queue;
+    while (totalBytesToCopyRemaining > 0) {
+        var headOfQueue = queue.peek();
+        var bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength);
+        var destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;
+        CopyDataBlockBytes(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy);
+        if (headOfQueue.byteLength === bytesToCopy) {
+            queue.shift();
+        }
+        else {
+            headOfQueue.byteOffset += bytesToCopy;
+            headOfQueue.byteLength -= bytesToCopy;
+        }
+        controller._queueTotalSize -= bytesToCopy;
+        ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor);
+        totalBytesToCopyRemaining -= bytesToCopy;
+    }
+    return ready;
+}
+function ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, size, pullIntoDescriptor) {
+    pullIntoDescriptor.bytesFilled += size;
+}
+function ReadableByteStreamControllerHandleQueueDrain(controller) {
+    if (controller._queueTotalSize === 0 && controller._closeRequested) {
+        ReadableByteStreamControllerClearAlgorithms(controller);
+        ReadableStreamClose(controller._controlledReadableByteStream);
+    }
+    else {
+        ReadableByteStreamControllerCallPullIfNeeded(controller);
+    }
+}
+function ReadableByteStreamControllerInvalidateBYOBRequest(controller) {
+    if (controller._byobRequest === null) {
+        return;
+    }
+    controller._byobRequest._associatedReadableByteStreamController = undefined;
+    controller._byobRequest._view = null;
+    controller._byobRequest = null;
+}
+function ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller) {
+    while (controller._pendingPullIntos.length > 0) {
+        if (controller._queueTotalSize === 0) {
+            return;
+        }
+        var pullIntoDescriptor = controller._pendingPullIntos.peek();
+        if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {
+            ReadableByteStreamControllerShiftPendingPullInto(controller);
+            ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);
+        }
+    }
+}
+function ReadableByteStreamControllerPullInto(controller, view, readIntoRequest) {
+    var stream = controller._controlledReadableByteStream;
+    var elementSize = 1;
+    if (view.constructor !== DataView) {
+        elementSize = view.constructor.BYTES_PER_ELEMENT;
+    }
+    var ctor = view.constructor;
+    // try {
+    var buffer = TransferArrayBuffer(view.buffer);
+    // } catch (e) {
+    //   readIntoRequest._errorSteps(e);
+    //   return;
+    // }
+    var pullIntoDescriptor = {
+        buffer: buffer,
+        bufferByteLength: buffer.byteLength,
+        byteOffset: view.byteOffset,
+        byteLength: view.byteLength,
+        bytesFilled: 0,
+        elementSize: elementSize,
+        viewConstructor: ctor,
+        readerType: 'byob'
+    };
+    if (controller._pendingPullIntos.length > 0) {
+        controller._pendingPullIntos.push(pullIntoDescriptor);
+        // No ReadableByteStreamControllerCallPullIfNeeded() call since:
+        // - No change happens on desiredSize
+        // - The source has already been notified of that there's at least 1 pending read(view)
+        ReadableStreamAddReadIntoRequest(stream, readIntoRequest);
+        return;
+    }
+    if (stream._state === 'closed') {
+        var emptyView = new ctor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0);
+        readIntoRequest._closeSteps(emptyView);
+        return;
+    }
+    if (controller._queueTotalSize > 0) {
+        if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {
+            var filledView = ReadableByteStreamControllerConvertPullIntoDescriptor(pullIntoDescriptor);
+            ReadableByteStreamControllerHandleQueueDrain(controller);
+            readIntoRequest._chunkSteps(filledView);
+            return;
+        }
+        if (controller._closeRequested) {
+            var e = new TypeError('Insufficient bytes to fill elements in the given buffer');
+            ReadableByteStreamControllerError(controller, e);
+            readIntoRequest._errorSteps(e);
+            return;
+        }
+    }
+    controller._pendingPullIntos.push(pullIntoDescriptor);
+    ReadableStreamAddReadIntoRequest(stream, readIntoRequest);
+    ReadableByteStreamControllerCallPullIfNeeded(controller);
+}
+function ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor) {
+    var stream = controller._controlledReadableByteStream;
+    if (ReadableStreamHasBYOBReader(stream)) {
+        while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {
+            var pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);
+            ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);
+        }
+    }
+}
+function ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, pullIntoDescriptor) {
+    ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor);
+    if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {
+        return;
+    }
+    ReadableByteStreamControllerShiftPendingPullInto(controller);
+    var remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize;
+    if (remainderSize > 0) {
+        var end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;
+        var remainder = ArrayBufferSlice(pullIntoDescriptor.buffer, end - remainderSize, end);
+        ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength);
+    }
+    pullIntoDescriptor.bytesFilled -= remainderSize;
+    ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);
+    ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);
+}
+function ReadableByteStreamControllerRespondInternal(controller, bytesWritten) {
+    var firstDescriptor = controller._pendingPullIntos.peek();
+    ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+    var state = controller._controlledReadableByteStream._state;
+    if (state === 'closed') {
+        ReadableByteStreamControllerRespondInClosedState(controller);
+    }
+    else {
+        ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);
+    }
+    ReadableByteStreamControllerCallPullIfNeeded(controller);
+}
+function ReadableByteStreamControllerShiftPendingPullInto(controller) {
+    var descriptor = controller._pendingPullIntos.shift();
+    return descriptor;
+}
+function ReadableByteStreamControllerShouldCallPull(controller) {
+    var stream = controller._controlledReadableByteStream;
+    if (stream._state !== 'readable') {
+        return false;
+    }
+    if (controller._closeRequested) {
+        return false;
+    }
+    if (!controller._started) {
+        return false;
+    }
+    if (ReadableStreamHasDefaultReader(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+        return true;
+    }
+    if (ReadableStreamHasBYOBReader(stream) && ReadableStreamGetNumReadIntoRequests(stream) > 0) {
+        return true;
+    }
+    var desiredSize = ReadableByteStreamControllerGetDesiredSize(controller);
+    if (desiredSize > 0) {
+        return true;
+    }
+    return false;
+}
+function ReadableByteStreamControllerClearAlgorithms(controller) {
+    controller._pullAlgorithm = undefined;
+    controller._cancelAlgorithm = undefined;
+}
+// A client of ReadableByteStreamController may use these functions directly to bypass state check.
+function ReadableByteStreamControllerClose(controller) {
+    var stream = controller._controlledReadableByteStream;
+    if (controller._closeRequested || stream._state !== 'readable') {
+        return;
+    }
+    if (controller._queueTotalSize > 0) {
+        controller._closeRequested = true;
+        return;
+    }
+    if (controller._pendingPullIntos.length > 0) {
+        var firstPendingPullInto = controller._pendingPullIntos.peek();
+        if (firstPendingPullInto.bytesFilled > 0) {
+            var e = new TypeError('Insufficient bytes to fill elements in the given buffer');
+            ReadableByteStreamControllerError(controller, e);
+            throw e;
+        }
+    }
+    ReadableByteStreamControllerClearAlgorithms(controller);
+    ReadableStreamClose(stream);
+}
+function ReadableByteStreamControllerEnqueue(controller, chunk) {
+    var stream = controller._controlledReadableByteStream;
+    if (controller._closeRequested || stream._state !== 'readable') {
+        return;
+    }
+    var buffer = chunk.buffer;
+    var byteOffset = chunk.byteOffset;
+    var byteLength = chunk.byteLength;
+    var transferredBuffer = TransferArrayBuffer(buffer);
+    if (controller._pendingPullIntos.length > 0) {
+        var firstPendingPullInto = controller._pendingPullIntos.peek();
+        if (IsDetachedBuffer(firstPendingPullInto.buffer)) ;
+        firstPendingPullInto.buffer = TransferArrayBuffer(firstPendingPullInto.buffer);
+    }
+    ReadableByteStreamControllerInvalidateBYOBRequest(controller);
+    if (ReadableStreamHasDefaultReader(stream)) {
+        if (ReadableStreamGetNumReadRequests(stream) === 0) {
+            ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+        }
+        else {
+            if (controller._pendingPullIntos.length > 0) {
+                ReadableByteStreamControllerShiftPendingPullInto(controller);
+            }
+            var transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength);
+            ReadableStreamFulfillReadRequest(stream, transferredView, false);
+        }
+    }
+    else if (ReadableStreamHasBYOBReader(stream)) {
+        // TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully.
+        ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+        ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);
+    }
+    else {
+        ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);
+    }
+    ReadableByteStreamControllerCallPullIfNeeded(controller);
+}
+function ReadableByteStreamControllerError(controller, e) {
+    var stream = controller._controlledReadableByteStream;
+    if (stream._state !== 'readable') {
+        return;
+    }
+    ReadableByteStreamControllerClearPendingPullIntos(controller);
+    ResetQueue(controller);
+    ReadableByteStreamControllerClearAlgorithms(controller);
+    ReadableStreamError(stream, e);
+}
+function ReadableByteStreamControllerGetBYOBRequest(controller) {
+    if (controller._byobRequest === null && controller._pendingPullIntos.length > 0) {
+        var firstDescriptor = controller._pendingPullIntos.peek();
+        var view = new Uint8Array(firstDescriptor.buffer, firstDescriptor.byteOffset + firstDescriptor.bytesFilled, firstDescriptor.byteLength - firstDescriptor.bytesFilled);
+        var byobRequest = Object.create(ReadableStreamBYOBRequest.prototype);
+        SetUpReadableStreamBYOBRequest(byobRequest, controller, view);
+        controller._byobRequest = byobRequest;
+    }
+    return controller._byobRequest;
+}
+function ReadableByteStreamControllerGetDesiredSize(controller) {
+    var state = controller._controlledReadableByteStream._state;
+    if (state === 'errored') {
+        return null;
+    }
+    if (state === 'closed') {
+        return 0;
+    }
+    return controller._strategyHWM - controller._queueTotalSize;
+}
+function ReadableByteStreamControllerRespond(controller, bytesWritten) {
+    var firstDescriptor = controller._pendingPullIntos.peek();
+    var state = controller._controlledReadableByteStream._state;
+    if (state === 'closed') {
+        if (bytesWritten !== 0) {
+            throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream');
+        }
+    }
+    else {
+        if (bytesWritten === 0) {
+            throw new TypeError('bytesWritten must be greater than 0 when calling respond() on a readable stream');
+        }
+        if (firstDescriptor.bytesFilled + bytesWritten > firstDescriptor.byteLength) {
+            throw new RangeError('bytesWritten out of range');
+        }
+    }
+    firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer);
+    ReadableByteStreamControllerRespondInternal(controller, bytesWritten);
+}
+function ReadableByteStreamControllerRespondWithNewView(controller, view) {
+    var firstDescriptor = controller._pendingPullIntos.peek();
+    var state = controller._controlledReadableByteStream._state;
+    if (state === 'closed') {
+        if (view.byteLength !== 0) {
+            throw new TypeError('The view\'s length must be 0 when calling respondWithNewView() on a closed stream');
+        }
+    }
+    else {
+        if (view.byteLength === 0) {
+            throw new TypeError('The view\'s length must be greater than 0 when calling respondWithNewView() on a readable stream');
+        }
+    }
+    if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) {
+        throw new RangeError('The region specified by view does not match byobRequest');
+    }
+    if (firstDescriptor.bufferByteLength !== view.buffer.byteLength) {
+        throw new RangeError('The buffer of view has different capacity than byobRequest');
+    }
+    if (firstDescriptor.bytesFilled + view.byteLength > firstDescriptor.byteLength) {
+        throw new RangeError('The region specified by view is larger than byobRequest');
+    }
+    var viewByteLength = view.byteLength;
+    firstDescriptor.buffer = TransferArrayBuffer(view.buffer);
+    ReadableByteStreamControllerRespondInternal(controller, viewByteLength);
+}
+function SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize) {
+    controller._controlledReadableByteStream = stream;
+    controller._pullAgain = false;
+    controller._pulling = false;
+    controller._byobRequest = null;
+    // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.
+    controller._queue = controller._queueTotalSize = undefined;
+    ResetQueue(controller);
+    controller._closeRequested = false;
+    controller._started = false;
+    controller._strategyHWM = highWaterMark;
+    controller._pullAlgorithm = pullAlgorithm;
+    controller._cancelAlgorithm = cancelAlgorithm;
+    controller._autoAllocateChunkSize = autoAllocateChunkSize;
+    controller._pendingPullIntos = new SimpleQueue();
+    stream._readableStreamController = controller;
+    var startResult = startAlgorithm();
+    uponPromise(promiseResolvedWith(startResult), function () {
+        controller._started = true;
+        ReadableByteStreamControllerCallPullIfNeeded(controller);
+    }, function (r) {
+        ReadableByteStreamControllerError(controller, r);
+    });
+}
+function SetUpReadableByteStreamControllerFromUnderlyingSource(stream, underlyingByteSource, highWaterMark) {
+    var controller = Object.create(ReadableByteStreamController.prototype);
+    var startAlgorithm = function () { return undefined; };
+    var pullAlgorithm = function () { return promiseResolvedWith(undefined); };
+    var cancelAlgorithm = function () { return promiseResolvedWith(undefined); };
+    if (underlyingByteSource.start !== undefined) {
+        startAlgorithm = function () { return underlyingByteSource.start(controller); };
+    }
+    if (underlyingByteSource.pull !== undefined) {
+        pullAlgorithm = function () { return underlyingByteSource.pull(controller); };
+    }
+    if (underlyingByteSource.cancel !== undefined) {
+        cancelAlgorithm = function (reason) { return underlyingByteSource.cancel(reason); };
+    }
+    var autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;
+    if (autoAllocateChunkSize === 0) {
+        throw new TypeError('autoAllocateChunkSize must be greater than 0');
+    }
+    SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize);
+}
+function SetUpReadableStreamBYOBRequest(request, controller, view) {
+    request._associatedReadableByteStreamController = controller;
+    request._view = view;
+}
+// Helper functions for the ReadableStreamBYOBRequest.
+function byobRequestBrandCheckException(name) {
+    return new TypeError("ReadableStreamBYOBRequest.prototype." + name + " can only be used on a ReadableStreamBYOBRequest");
+}
+// Helper functions for the ReadableByteStreamController.
+function byteStreamControllerBrandCheckException(name) {
+    return new TypeError("ReadableByteStreamController.prototype." + name + " can only be used on a ReadableByteStreamController");
+}
+
+// Abstract operations for the ReadableStream.
+function AcquireReadableStreamBYOBReader(stream) {
+    return new ReadableStreamBYOBReader(stream);
+}
+// ReadableStream API exposed for controllers.
+function ReadableStreamAddReadIntoRequest(stream, readIntoRequest) {
+    stream._reader._readIntoRequests.push(readIntoRequest);
+}
+function ReadableStreamFulfillReadIntoRequest(stream, chunk, done) {
+    var reader = stream._reader;
+    var readIntoRequest = reader._readIntoRequests.shift();
+    if (done) {
+        readIntoRequest._closeSteps(chunk);
+    }
+    else {
+        readIntoRequest._chunkSteps(chunk);
+    }
+}
+function ReadableStreamGetNumReadIntoRequests(stream) {
+    return stream._reader._readIntoRequests.length;
+}
+function ReadableStreamHasBYOBReader(stream) {
+    var reader = stream._reader;
+    if (reader === undefined) {
+        return false;
+    }
+    if (!IsReadableStreamBYOBReader(reader)) {
+        return false;
+    }
+    return true;
+}
+/**
+ * A BYOB reader vended by a {@link ReadableStream}.
+ *
+ * @public
+ */
+var ReadableStreamBYOBReader = /** @class */ (function () {
+    function ReadableStreamBYOBReader(stream) {
+        assertRequiredArgument(stream, 1, 'ReadableStreamBYOBReader');
+        assertReadableStream(stream, 'First parameter');
+        if (IsReadableStreamLocked(stream)) {
+            throw new TypeError('This stream has already been locked for exclusive reading by another reader');
+        }
+        if (!IsReadableByteStreamController(stream._readableStreamController)) {
+            throw new TypeError('Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte ' +
+                'source');
+        }
+        ReadableStreamReaderGenericInitialize(this, stream);
+        this._readIntoRequests = new SimpleQueue();
+    }
+    Object.defineProperty(ReadableStreamBYOBReader.prototype, "closed", {
+        /**
+         * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or
+         * the reader's lock is released before the stream finishes closing.
+         */
+        get: function () {
+            if (!IsReadableStreamBYOBReader(this)) {
+                return promiseRejectedWith(byobReaderBrandCheckException('closed'));
+            }
+            return this._closedPromise;
+        },
+        enumerable: false,
+        configurable: true
+    });
+    /**
+     * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.
+     */
+    ReadableStreamBYOBReader.prototype.cancel = function (reason) {
+        if (reason === void 0) { reason = undefined; }
+        if (!IsReadableStreamBYOBReader(this)) {
+            return promiseRejectedWith(byobReaderBrandCheckException('cancel'));
+        }
+        if (this._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('cancel'));
+        }
+        return ReadableStreamReaderGenericCancel(this, reason);
+    };
+    /**
+     * Attempts to reads bytes into view, and returns a promise resolved with the result.
+     *
+     * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.
+     */
+    ReadableStreamBYOBReader.prototype.read = function (view) {
+        if (!IsReadableStreamBYOBReader(this)) {
+            return promiseRejectedWith(byobReaderBrandCheckException('read'));
+        }
+        if (!ArrayBuffer.isView(view)) {
+            return promiseRejectedWith(new TypeError('view must be an array buffer view'));
+        }
+        if (view.byteLength === 0) {
+            return promiseRejectedWith(new TypeError('view must have non-zero byteLength'));
+        }
+        if (view.buffer.byteLength === 0) {
+            return promiseRejectedWith(new TypeError("view's buffer must have non-zero byteLength"));
+        }
+        if (IsDetachedBuffer(view.buffer)) ;
+        if (this._ownerReadableStream === undefined) {
+            return promiseRejectedWith(readerLockException('read from'));
+        }
+        var resolvePromise;
+        var rejectPromise;
+        var promise = newPromise(function (resolve, reject) {
+            resolvePromise = resolve;
+            rejectPromise = reject;
+        });
+        var readIntoRequest = {
+            _chunkSteps: function (chunk) { return resolvePromise({ value: chunk, done: false }); },
+            _closeSteps: function (chunk) { return resolvePromise({ value: chunk, done: true }); },
+            _errorSteps: function (e) { return rejectPromise(e); }
+        };
+        ReadableStreamBYOBReaderRead(this, view, readIntoRequest);
+        return promise;
+    };
+    /**
+     * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.
+     * If the associated stream is errored when the lock is released, the reader will appear errored in the same way
+     * from now on; otherwise, the reader will appear closed.
+     *
+     * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by
+     * the reader's {@link ReadableStreamBYOBReader.read | read()} method has not yet been settled. Attempting to
+     * do so will throw a `TypeError` and leave the reader locked to the stream.
+     */
+    ReadableStreamBYOBReader.prototype.releaseLock = function () {
+        if (!IsReadableStreamBYOBReader(this)) {
+            throw byobReaderBrandCheckException('releaseLock');
+        }
+        if (this._ownerReadableStream === undefined) {
+            return;
+        }
+        if (this._readIntoRequests.length > 0) {
+            throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');
+        }
+        ReadableStreamReaderGenericRelease(this);
+    };
+    return ReadableStreamBYOBReader;
+}());
+Object.defineProperties(ReadableStreamBYOBReader.prototype, {
+    cancel: { enumerable: true },
+    read: { enumerable: true },
+    releaseLock: { enumerable: true },
+    closed: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableStreamBYOBReader.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableStreamBYOBReader',
+        configurable: true
+    });
+}
+// Abstract operations for the readers.
+function IsReadableStreamBYOBReader(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_readIntoRequests')) {
+        return false;
+    }
+    return x instanceof ReadableStreamBYOBReader;
+}
+function ReadableStreamBYOBReaderRead(reader, view, readIntoRequest) {
+    var stream = reader._ownerReadableStream;
+    stream._disturbed = true;
+    if (stream._state === 'errored') {
+        readIntoRequest._errorSteps(stream._storedError);
+    }
+    else {
+        ReadableByteStreamControllerPullInto(stream._readableStreamController, view, readIntoRequest);
+    }
+}
+// Helper functions for the ReadableStreamBYOBReader.
+function byobReaderBrandCheckException(name) {
+    return new TypeError("ReadableStreamBYOBReader.prototype." + name + " can only be used on a ReadableStreamBYOBReader");
+}
+
+function ExtractHighWaterMark(strategy, defaultHWM) {
+    var highWaterMark = strategy.highWaterMark;
+    if (highWaterMark === undefined) {
+        return defaultHWM;
+    }
+    if (NumberIsNaN(highWaterMark) || highWaterMark < 0) {
+        throw new RangeError('Invalid highWaterMark');
+    }
+    return highWaterMark;
+}
+function ExtractSizeAlgorithm(strategy) {
+    var size = strategy.size;
+    if (!size) {
+        return function () { return 1; };
+    }
+    return size;
+}
+
+function convertQueuingStrategy(init, context) {
+    assertDictionary(init, context);
+    var highWaterMark = init === null || init === void 0 ? void 0 : init.highWaterMark;
+    var size = init === null || init === void 0 ? void 0 : init.size;
+    return {
+        highWaterMark: highWaterMark === undefined ? undefined : convertUnrestrictedDouble(highWaterMark),
+        size: size === undefined ? undefined : convertQueuingStrategySize(size, context + " has member 'size' that")
+    };
+}
+function convertQueuingStrategySize(fn, context) {
+    assertFunction(fn, context);
+    return function (chunk) { return convertUnrestrictedDouble(fn(chunk)); };
+}
+
+function convertUnderlyingSink(original, context) {
+    assertDictionary(original, context);
+    var abort = original === null || original === void 0 ? void 0 : original.abort;
+    var close = original === null || original === void 0 ? void 0 : original.close;
+    var start = original === null || original === void 0 ? void 0 : original.start;
+    var type = original === null || original === void 0 ? void 0 : original.type;
+    var write = original === null || original === void 0 ? void 0 : original.write;
+    return {
+        abort: abort === undefined ?
+            undefined :
+            convertUnderlyingSinkAbortCallback(abort, original, context + " has member 'abort' that"),
+        close: close === undefined ?
+            undefined :
+            convertUnderlyingSinkCloseCallback(close, original, context + " has member 'close' that"),
+        start: start === undefined ?
+            undefined :
+            convertUnderlyingSinkStartCallback(start, original, context + " has member 'start' that"),
+        write: write === undefined ?
+            undefined :
+            convertUnderlyingSinkWriteCallback(write, original, context + " has member 'write' that"),
+        type: type
+    };
+}
+function convertUnderlyingSinkAbortCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return function (reason) { return promiseCall(fn, original, [reason]); };
+}
+function convertUnderlyingSinkCloseCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return function () { return promiseCall(fn, original, []); };
+}
+function convertUnderlyingSinkStartCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return function (controller) { return reflectCall(fn, original, [controller]); };
+}
+function convertUnderlyingSinkWriteCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return function (chunk, controller) { return promiseCall(fn, original, [chunk, controller]); };
+}
+
+function assertWritableStream(x, context) {
+    if (!IsWritableStream(x)) {
+        throw new TypeError(context + " is not a WritableStream.");
+    }
+}
+
+function isAbortSignal(value) {
+    if (typeof value !== 'object' || value === null) {
+        return false;
+    }
+    try {
+        return typeof value.aborted === 'boolean';
+    }
+    catch (_a) {
+        // AbortSignal.prototype.aborted throws if its brand check fails
+        return false;
+    }
+}
+var supportsAbortController = typeof AbortController === 'function';
+/**
+ * Construct a new AbortController, if supported by the platform.
+ *
+ * @internal
+ */
+function createAbortController() {
+    if (supportsAbortController) {
+        return new AbortController();
+    }
+    return undefined;
+}
+
+/**
+ * A writable stream represents a destination for data, into which you can write.
+ *
+ * @public
+ */
+var WritableStream = /** @class */ (function () {
+    function WritableStream(rawUnderlyingSink, rawStrategy) {
+        if (rawUnderlyingSink === void 0) { rawUnderlyingSink = {}; }
+        if (rawStrategy === void 0) { rawStrategy = {}; }
+        if (rawUnderlyingSink === undefined) {
+            rawUnderlyingSink = null;
+        }
+        else {
+            assertObject(rawUnderlyingSink, 'First parameter');
+        }
+        var strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');
+        var underlyingSink = convertUnderlyingSink(rawUnderlyingSink, 'First parameter');
+        InitializeWritableStream(this);
+        var type = underlyingSink.type;
+        if (type !== undefined) {
+            throw new RangeError('Invalid type is specified');
+        }
+        var sizeAlgorithm = ExtractSizeAlgorithm(strategy);
+        var highWaterMark = ExtractHighWaterMark(strategy, 1);
+        SetUpWritableStreamDefaultControllerFromUnderlyingSink(this, underlyingSink, highWaterMark, sizeAlgorithm);
+    }
+    Object.defineProperty(WritableStream.prototype, "locked", {
+        /**
+         * Returns whether or not the writable stream is locked to a writer.
+         */
+        get: function () {
+            if (!IsWritableStream(this)) {
+                throw streamBrandCheckException$2('locked');
+            }
+            return IsWritableStreamLocked(this);
+        },
+        enumerable: false,
+        configurable: true
+    });
+    /**
+     * Aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be
+     * immediately moved to an errored state, with any queued-up writes discarded. This will also execute any abort
+     * mechanism of the underlying sink.
+     *
+     * The returned promise will fulfill if the stream shuts down successfully, or reject if the underlying sink signaled
+     * that there was an error doing so. Additionally, it will reject with a `TypeError` (without attempting to cancel
+     * the stream) if the stream is currently locked.
+     */
+    WritableStream.prototype.abort = function (reason) {
+        if (reason === void 0) { reason = undefined; }
+        if (!IsWritableStream(this)) {
+            return promiseRejectedWith(streamBrandCheckException$2('abort'));
+        }
+        if (IsWritableStreamLocked(this)) {
+            return promiseRejectedWith(new TypeError('Cannot abort a stream that already has a writer'));
+        }
+        return WritableStreamAbort(this, reason);
+    };
+    /**
+     * Closes the stream. The underlying sink will finish processing any previously-written chunks, before invoking its
+     * close behavior. During this time any further attempts to write will fail (without erroring the stream).
+     *
+     * The method returns a promise that will fulfill if all remaining chunks are successfully written and the stream
+     * successfully closes, or rejects if an error is encountered during this process. Additionally, it will reject with
+     * a `TypeError` (without attempting to cancel the stream) if the stream is currently locked.
+     */
+    WritableStream.prototype.close = function () {
+        if (!IsWritableStream(this)) {
+            return promiseRejectedWith(streamBrandCheckException$2('close'));
+        }
+        if (IsWritableStreamLocked(this)) {
+            return promiseRejectedWith(new TypeError('Cannot close a stream that already has a writer'));
+        }
+        if (WritableStreamCloseQueuedOrInFlight(this)) {
+            return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));
+        }
+        return WritableStreamClose(this);
+    };
+    /**
+     * Creates a {@link WritableStreamDefaultWriter | writer} and locks the stream to the new writer. While the stream
+     * is locked, no other writer can be acquired until this one is released.
+     *
+     * This functionality is especially useful for creating abstractions that desire the ability to write to a stream
+     * without interruption or interleaving. By getting a writer for the stream, you can ensure nobody else can write at
+     * the same time, which would cause the resulting written data to be unpredictable and probably useless.
+     */
+    WritableStream.prototype.getWriter = function () {
+        if (!IsWritableStream(this)) {
+            throw streamBrandCheckException$2('getWriter');
+        }
+        return AcquireWritableStreamDefaultWriter(this);
+    };
+    return WritableStream;
+}());
+Object.defineProperties(WritableStream.prototype, {
+    abort: { enumerable: true },
+    close: { enumerable: true },
+    getWriter: { enumerable: true },
+    locked: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(WritableStream.prototype, SymbolPolyfill.toStringTag, {
+        value: 'WritableStream',
+        configurable: true
+    });
+}
+// Abstract operations for the WritableStream.
+function AcquireWritableStreamDefaultWriter(stream) {
+    return new WritableStreamDefaultWriter(stream);
+}
+// Throws if and only if startAlgorithm throws.
+function CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm) {
+    if (highWaterMark === void 0) { highWaterMark = 1; }
+    if (sizeAlgorithm === void 0) { sizeAlgorithm = function () { return 1; }; }
+    var stream = Object.create(WritableStream.prototype);
+    InitializeWritableStream(stream);
+    var controller = Object.create(WritableStreamDefaultController.prototype);
+    SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm);
+    return stream;
+}
+function InitializeWritableStream(stream) {
+    stream._state = 'writable';
+    // The error that will be reported by new method calls once the state becomes errored. Only set when [[state]] is
+    // 'erroring' or 'errored'. May be set to an undefined value.
+    stream._storedError = undefined;
+    stream._writer = undefined;
+    // Initialize to undefined first because the constructor of the controller checks this
+    // variable to validate the caller.
+    stream._writableStreamController = undefined;
+    // This queue is placed here instead of the writer class in order to allow for passing a writer to the next data
+    // producer without waiting for the queued writes to finish.
+    stream._writeRequests = new SimpleQueue();
+    // Write requests are removed from _writeRequests when write() is called on the underlying sink. This prevents
+    // them from being erroneously rejected on error. If a write() call is in-flight, the request is stored here.
+    stream._inFlightWriteRequest = undefined;
+    // The promise that was returned from writer.close(). Stored here because it may be fulfilled after the writer
+    // has been detached.
+    stream._closeRequest = undefined;
+    // Close request is removed from _closeRequest when close() is called on the underlying sink. This prevents it
+    // from being erroneously rejected on error. If a close() call is in-flight, the request is stored here.
+    stream._inFlightCloseRequest = undefined;
+    // The promise that was returned from writer.abort(). This may also be fulfilled after the writer has detached.
+    stream._pendingAbortRequest = undefined;
+    // The backpressure signal set by the controller.
+    stream._backpressure = false;
+}
+function IsWritableStream(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_writableStreamController')) {
+        return false;
+    }
+    return x instanceof WritableStream;
+}
+function IsWritableStreamLocked(stream) {
+    if (stream._writer === undefined) {
+        return false;
+    }
+    return true;
+}
+function WritableStreamAbort(stream, reason) {
+    var _a;
+    if (stream._state === 'closed' || stream._state === 'errored') {
+        return promiseResolvedWith(undefined);
+    }
+    stream._writableStreamController._abortReason = reason;
+    (_a = stream._writableStreamController._abortController) === null || _a === void 0 ? void 0 : _a.abort();
+    // TypeScript narrows the type of `stream._state` down to 'writable' | 'erroring',
+    // but it doesn't know that signaling abort runs author code that might have changed the state.
+    // Widen the type again by casting to WritableStreamState.
+    var state = stream._state;
+    if (state === 'closed' || state === 'errored') {
+        return promiseResolvedWith(undefined);
+    }
+    if (stream._pendingAbortRequest !== undefined) {
+        return stream._pendingAbortRequest._promise;
+    }
+    var wasAlreadyErroring = false;
+    if (state === 'erroring') {
+        wasAlreadyErroring = true;
+        // reason will not be used, so don't keep a reference to it.
+        reason = undefined;
+    }
+    var promise = newPromise(function (resolve, reject) {
+        stream._pendingAbortRequest = {
+            _promise: undefined,
+            _resolve: resolve,
+            _reject: reject,
+            _reason: reason,
+            _wasAlreadyErroring: wasAlreadyErroring
+        };
+    });
+    stream._pendingAbortRequest._promise = promise;
+    if (!wasAlreadyErroring) {
+        WritableStreamStartErroring(stream, reason);
+    }
+    return promise;
+}
+function WritableStreamClose(stream) {
+    var state = stream._state;
+    if (state === 'closed' || state === 'errored') {
+        return promiseRejectedWith(new TypeError("The stream (in " + state + " state) is not in the writable state and cannot be closed"));
+    }
+    var promise = newPromise(function (resolve, reject) {
+        var closeRequest = {
+            _resolve: resolve,
+            _reject: reject
+        };
+        stream._closeRequest = closeRequest;
+    });
+    var writer = stream._writer;
+    if (writer !== undefined && stream._backpressure && state === 'writable') {
+        defaultWriterReadyPromiseResolve(writer);
+    }
+    WritableStreamDefaultControllerClose(stream._writableStreamController);
+    return promise;
+}
+// WritableStream API exposed for controllers.
+function WritableStreamAddWriteRequest(stream) {
+    var promise = newPromise(function (resolve, reject) {
+        var writeRequest = {
+            _resolve: resolve,
+            _reject: reject
+        };
+        stream._writeRequests.push(writeRequest);
+    });
+    return promise;
+}
+function WritableStreamDealWithRejection(stream, error) {
+    var state = stream._state;
+    if (state === 'writable') {
+        WritableStreamStartErroring(stream, error);
+        return;
+    }
+    WritableStreamFinishErroring(stream);
+}
+function WritableStreamStartErroring(stream, reason) {
+    var controller = stream._writableStreamController;
+    stream._state = 'erroring';
+    stream._storedError = reason;
+    var writer = stream._writer;
+    if (writer !== undefined) {
+        WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);
+    }
+    if (!WritableStreamHasOperationMarkedInFlight(stream) && controller._started) {
+        WritableStreamFinishErroring(stream);
+    }
+}
+function WritableStreamFinishErroring(stream) {
+    stream._state = 'errored';
+    stream._writableStreamController[ErrorSteps]();
+    var storedError = stream._storedError;
+    stream._writeRequests.forEach(function (writeRequest) {
+        writeRequest._reject(storedError);
+    });
+    stream._writeRequests = new SimpleQueue();
+    if (stream._pendingAbortRequest === undefined) {
+        WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+        return;
+    }
+    var abortRequest = stream._pendingAbortRequest;
+    stream._pendingAbortRequest = undefined;
+    if (abortRequest._wasAlreadyErroring) {
+        abortRequest._reject(storedError);
+        WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+        return;
+    }
+    var promise = stream._writableStreamController[AbortSteps](abortRequest._reason);
+    uponPromise(promise, function () {
+        abortRequest._resolve();
+        WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+    }, function (reason) {
+        abortRequest._reject(reason);
+        WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);
+    });
+}
+function WritableStreamFinishInFlightWrite(stream) {
+    stream._inFlightWriteRequest._resolve(undefined);
+    stream._inFlightWriteRequest = undefined;
+}
+function WritableStreamFinishInFlightWriteWithError(stream, error) {
+    stream._inFlightWriteRequest._reject(error);
+    stream._inFlightWriteRequest = undefined;
+    WritableStreamDealWithRejection(stream, error);
+}
+function WritableStreamFinishInFlightClose(stream) {
+    stream._inFlightCloseRequest._resolve(undefined);
+    stream._inFlightCloseRequest = undefined;
+    var state = stream._state;
+    if (state === 'erroring') {
+        // The error was too late to do anything, so it is ignored.
+        stream._storedError = undefined;
+        if (stream._pendingAbortRequest !== undefined) {
+            stream._pendingAbortRequest._resolve();
+            stream._pendingAbortRequest = undefined;
+        }
+    }
+    stream._state = 'closed';
+    var writer = stream._writer;
+    if (writer !== undefined) {
+        defaultWriterClosedPromiseResolve(writer);
+    }
+}
+function WritableStreamFinishInFlightCloseWithError(stream, error) {
+    stream._inFlightCloseRequest._reject(error);
+    stream._inFlightCloseRequest = undefined;
+    // Never execute sink abort() after sink close().
+    if (stream._pendingAbortRequest !== undefined) {
+        stream._pendingAbortRequest._reject(error);
+        stream._pendingAbortRequest = undefined;
+    }
+    WritableStreamDealWithRejection(stream, error);
+}
+// TODO(ricea): Fix alphabetical order.
+function WritableStreamCloseQueuedOrInFlight(stream) {
+    if (stream._closeRequest === undefined && stream._inFlightCloseRequest === undefined) {
+        return false;
+    }
+    return true;
+}
+function WritableStreamHasOperationMarkedInFlight(stream) {
+    if (stream._inFlightWriteRequest === undefined && stream._inFlightCloseRequest === undefined) {
+        return false;
+    }
+    return true;
+}
+function WritableStreamMarkCloseRequestInFlight(stream) {
+    stream._inFlightCloseRequest = stream._closeRequest;
+    stream._closeRequest = undefined;
+}
+function WritableStreamMarkFirstWriteRequestInFlight(stream) {
+    stream._inFlightWriteRequest = stream._writeRequests.shift();
+}
+function WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream) {
+    if (stream._closeRequest !== undefined) {
+        stream._closeRequest._reject(stream._storedError);
+        stream._closeRequest = undefined;
+    }
+    var writer = stream._writer;
+    if (writer !== undefined) {
+        defaultWriterClosedPromiseReject(writer, stream._storedError);
+    }
+}
+function WritableStreamUpdateBackpressure(stream, backpressure) {
+    var writer = stream._writer;
+    if (writer !== undefined && backpressure !== stream._backpressure) {
+        if (backpressure) {
+            defaultWriterReadyPromiseReset(writer);
+        }
+        else {
+            defaultWriterReadyPromiseResolve(writer);
+        }
+    }
+    stream._backpressure = backpressure;
+}
+/**
+ * A default writer vended by a {@link WritableStream}.
+ *
+ * @public
+ */
+var WritableStreamDefaultWriter = /** @class */ (function () {
+    function WritableStreamDefaultWriter(stream) {
+        assertRequiredArgument(stream, 1, 'WritableStreamDefaultWriter');
+        assertWritableStream(stream, 'First parameter');
+        if (IsWritableStreamLocked(stream)) {
+            throw new TypeError('This stream has already been locked for exclusive writing by another writer');
+        }
+        this._ownerWritableStream = stream;
+        stream._writer = this;
+        var state = stream._state;
+        if (state === 'writable') {
+            if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._backpressure) {
+                defaultWriterReadyPromiseInitialize(this);
+            }
+            else {
+                defaultWriterReadyPromiseInitializeAsResolved(this);
+            }
+            defaultWriterClosedPromiseInitialize(this);
+        }
+        else if (state === 'erroring') {
+            defaultWriterReadyPromiseInitializeAsRejected(this, stream._storedError);
+            defaultWriterClosedPromiseInitialize(this);
+        }
+        else if (state === 'closed') {
+            defaultWriterReadyPromiseInitializeAsResolved(this);
+            defaultWriterClosedPromiseInitializeAsResolved(this);
+        }
+        else {
+            var storedError = stream._storedError;
+            defaultWriterReadyPromiseInitializeAsRejected(this, storedError);
+            defaultWriterClosedPromiseInitializeAsRejected(this, storedError);
+        }
+    }
+    Object.defineProperty(WritableStreamDefaultWriter.prototype, "closed", {
+        /**
+         * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or
+         * the writer’s lock is released before the stream finishes closing.
+         */
+        get: function () {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                return promiseRejectedWith(defaultWriterBrandCheckException('closed'));
+            }
+            return this._closedPromise;
+        },
+        enumerable: false,
+        configurable: true
+    });
+    Object.defineProperty(WritableStreamDefaultWriter.prototype, "desiredSize", {
+        /**
+         * Returns the desired size to fill the stream’s internal queue. It can be negative, if the queue is over-full.
+         * A producer can use this information to determine the right amount of data to write.
+         *
+         * It will be `null` if the stream cannot be successfully written to (due to either being errored, or having an abort
+         * queued up). It will return zero if the stream is closed. And the getter will throw an exception if invoked when
+         * the writer’s lock is released.
+         */
+        get: function () {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                throw defaultWriterBrandCheckException('desiredSize');
+            }
+            if (this._ownerWritableStream === undefined) {
+                throw defaultWriterLockException('desiredSize');
+            }
+            return WritableStreamDefaultWriterGetDesiredSize(this);
+        },
+        enumerable: false,
+        configurable: true
+    });
+    Object.defineProperty(WritableStreamDefaultWriter.prototype, "ready", {
+        /**
+         * Returns a promise that will be fulfilled when the desired size to fill the stream’s internal queue transitions
+         * from non-positive to positive, signaling that it is no longer applying backpressure. Once the desired size dips
+         * back to zero or below, the getter will return a new promise that stays pending until the next transition.
+         *
+         * If the stream becomes errored or aborted, or the writer’s lock is released, the returned promise will become
+         * rejected.
+         */
+        get: function () {
+            if (!IsWritableStreamDefaultWriter(this)) {
+                return promiseRejectedWith(defaultWriterBrandCheckException('ready'));
+            }
+            return this._readyPromise;
+        },
+        enumerable: false,
+        configurable: true
+    });
+    /**
+     * If the reader is active, behaves the same as {@link WritableStream.abort | stream.abort(reason)}.
+     */
+    WritableStreamDefaultWriter.prototype.abort = function (reason) {
+        if (reason === void 0) { reason = undefined; }
+        if (!IsWritableStreamDefaultWriter(this)) {
+            return promiseRejectedWith(defaultWriterBrandCheckException('abort'));
+        }
+        if (this._ownerWritableStream === undefined) {
+            return promiseRejectedWith(defaultWriterLockException('abort'));
+        }
+        return WritableStreamDefaultWriterAbort(this, reason);
+    };
+    /**
+     * If the reader is active, behaves the same as {@link WritableStream.close | stream.close()}.
+     */
+    WritableStreamDefaultWriter.prototype.close = function () {
+        if (!IsWritableStreamDefaultWriter(this)) {
+            return promiseRejectedWith(defaultWriterBrandCheckException('close'));
+        }
+        var stream = this._ownerWritableStream;
+        if (stream === undefined) {
+            return promiseRejectedWith(defaultWriterLockException('close'));
+        }
+        if (WritableStreamCloseQueuedOrInFlight(stream)) {
+            return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));
+        }
+        return WritableStreamDefaultWriterClose(this);
+    };
+    /**
+     * Releases the writer’s lock on the corresponding stream. After the lock is released, the writer is no longer active.
+     * If the associated stream is errored when the lock is released, the writer will appear errored in the same way from
+     * now on; otherwise, the writer will appear closed.
+     *
+     * Note that the lock can still be released even if some ongoing writes have not yet finished (i.e. even if the
+     * promises returned from previous calls to {@link WritableStreamDefaultWriter.write | write()} have not yet settled).
+     * It’s not necessary to hold the lock on the writer for the duration of the write; the lock instead simply prevents
+     * other producers from writing in an interleaved manner.
+     */
+    WritableStreamDefaultWriter.prototype.releaseLock = function () {
+        if (!IsWritableStreamDefaultWriter(this)) {
+            throw defaultWriterBrandCheckException('releaseLock');
+        }
+        var stream = this._ownerWritableStream;
+        if (stream === undefined) {
+            return;
+        }
+        WritableStreamDefaultWriterRelease(this);
+    };
+    WritableStreamDefaultWriter.prototype.write = function (chunk) {
+        if (chunk === void 0) { chunk = undefined; }
+        if (!IsWritableStreamDefaultWriter(this)) {
+            return promiseRejectedWith(defaultWriterBrandCheckException('write'));
+        }
+        if (this._ownerWritableStream === undefined) {
+            return promiseRejectedWith(defaultWriterLockException('write to'));
+        }
+        return WritableStreamDefaultWriterWrite(this, chunk);
+    };
+    return WritableStreamDefaultWriter;
+}());
+Object.defineProperties(WritableStreamDefaultWriter.prototype, {
+    abort: { enumerable: true },
+    close: { enumerable: true },
+    releaseLock: { enumerable: true },
+    write: { enumerable: true },
+    closed: { enumerable: true },
+    desiredSize: { enumerable: true },
+    ready: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(WritableStreamDefaultWriter.prototype, SymbolPolyfill.toStringTag, {
+        value: 'WritableStreamDefaultWriter',
+        configurable: true
+    });
+}
+// Abstract operations for the WritableStreamDefaultWriter.
+function IsWritableStreamDefaultWriter(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) {
+        return false;
+    }
+    return x instanceof WritableStreamDefaultWriter;
+}
+// A client of WritableStreamDefaultWriter may use these functions directly to bypass state check.
+function WritableStreamDefaultWriterAbort(writer, reason) {
+    var stream = writer._ownerWritableStream;
+    return WritableStreamAbort(stream, reason);
+}
+function WritableStreamDefaultWriterClose(writer) {
+    var stream = writer._ownerWritableStream;
+    return WritableStreamClose(stream);
+}
+function WritableStreamDefaultWriterCloseWithErrorPropagation(writer) {
+    var stream = writer._ownerWritableStream;
+    var state = stream._state;
+    if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {
+        return promiseResolvedWith(undefined);
+    }
+    if (state === 'errored') {
+        return promiseRejectedWith(stream._storedError);
+    }
+    return WritableStreamDefaultWriterClose(writer);
+}
+function WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, error) {
+    if (writer._closedPromiseState === 'pending') {
+        defaultWriterClosedPromiseReject(writer, error);
+    }
+    else {
+        defaultWriterClosedPromiseResetToRejected(writer, error);
+    }
+}
+function WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, error) {
+    if (writer._readyPromiseState === 'pending') {
+        defaultWriterReadyPromiseReject(writer, error);
+    }
+    else {
+        defaultWriterReadyPromiseResetToRejected(writer, error);
+    }
+}
+function WritableStreamDefaultWriterGetDesiredSize(writer) {
+    var stream = writer._ownerWritableStream;
+    var state = stream._state;
+    if (state === 'errored' || state === 'erroring') {
+        return null;
+    }
+    if (state === 'closed') {
+        return 0;
+    }
+    return WritableStreamDefaultControllerGetDesiredSize(stream._writableStreamController);
+}
+function WritableStreamDefaultWriterRelease(writer) {
+    var stream = writer._ownerWritableStream;
+    var releasedError = new TypeError("Writer was released and can no longer be used to monitor the stream's closedness");
+    WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, releasedError);
+    // The state transitions to "errored" before the sink abort() method runs, but the writer.closed promise is not
+    // rejected until afterwards. This means that simply testing state will not work.
+    WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, releasedError);
+    stream._writer = undefined;
+    writer._ownerWritableStream = undefined;
+}
+function WritableStreamDefaultWriterWrite(writer, chunk) {
+    var stream = writer._ownerWritableStream;
+    var controller = stream._writableStreamController;
+    var chunkSize = WritableStreamDefaultControllerGetChunkSize(controller, chunk);
+    if (stream !== writer._ownerWritableStream) {
+        return promiseRejectedWith(defaultWriterLockException('write to'));
+    }
+    var state = stream._state;
+    if (state === 'errored') {
+        return promiseRejectedWith(stream._storedError);
+    }
+    if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {
+        return promiseRejectedWith(new TypeError('The stream is closing or closed and cannot be written to'));
+    }
+    if (state === 'erroring') {
+        return promiseRejectedWith(stream._storedError);
+    }
+    var promise = WritableStreamAddWriteRequest(stream);
+    WritableStreamDefaultControllerWrite(controller, chunk, chunkSize);
+    return promise;
+}
+var closeSentinel = {};
+/**
+ * Allows control of a {@link WritableStream | writable stream}'s state and internal queue.
+ *
+ * @public
+ */
+var WritableStreamDefaultController = /** @class */ (function () {
+    function WritableStreamDefaultController() {
+        throw new TypeError('Illegal constructor');
+    }
+    Object.defineProperty(WritableStreamDefaultController.prototype, "abortReason", {
+        /**
+         * The reason which was passed to `WritableStream.abort(reason)` when the stream was aborted.
+         *
+         * @deprecated
+         *  This property has been removed from the specification, see https://github.com/whatwg/streams/pull/1177.
+         *  Use {@link WritableStreamDefaultController.signal}'s `reason` instead.
+         */
+        get: function () {
+            if (!IsWritableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$2('abortReason');
+            }
+            return this._abortReason;
+        },
+        enumerable: false,
+        configurable: true
+    });
+    Object.defineProperty(WritableStreamDefaultController.prototype, "signal", {
+        /**
+         * An `AbortSignal` that can be used to abort the pending write or close operation when the stream is aborted.
+         */
+        get: function () {
+            if (!IsWritableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$2('signal');
+            }
+            if (this._abortController === undefined) {
+                // Older browsers or older Node versions may not support `AbortController` or `AbortSignal`.
+                // We don't want to bundle and ship an `AbortController` polyfill together with our polyfill,
+                // so instead we only implement support for `signal` if we find a global `AbortController` constructor.
+                throw new TypeError('WritableStreamDefaultController.prototype.signal is not supported');
+            }
+            return this._abortController.signal;
+        },
+        enumerable: false,
+        configurable: true
+    });
+    /**
+     * Closes the controlled writable stream, making all future interactions with it fail with the given error `e`.
+     *
+     * This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying
+     * sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the
+     * normal lifecycle of interactions with the underlying sink.
+     */
+    WritableStreamDefaultController.prototype.error = function (e) {
+        if (e === void 0) { e = undefined; }
+        if (!IsWritableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$2('error');
+        }
+        var state = this._controlledWritableStream._state;
+        if (state !== 'writable') {
+            // The stream is closed, errored or will be soon. The sink can't do anything useful if it gets an error here, so
+            // just treat it as a no-op.
+            return;
+        }
+        WritableStreamDefaultControllerError(this, e);
+    };
+    /** @internal */
+    WritableStreamDefaultController.prototype[AbortSteps] = function (reason) {
+        var result = this._abortAlgorithm(reason);
+        WritableStreamDefaultControllerClearAlgorithms(this);
+        return result;
+    };
+    /** @internal */
+    WritableStreamDefaultController.prototype[ErrorSteps] = function () {
+        ResetQueue(this);
+    };
+    return WritableStreamDefaultController;
+}());
+Object.defineProperties(WritableStreamDefaultController.prototype, {
+    abortReason: { enumerable: true },
+    signal: { enumerable: true },
+    error: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(WritableStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+        value: 'WritableStreamDefaultController',
+        configurable: true
+    });
+}
+// Abstract operations implementing interface required by the WritableStream.
+function IsWritableStreamDefaultController(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_controlledWritableStream')) {
+        return false;
+    }
+    return x instanceof WritableStreamDefaultController;
+}
+function SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm) {
+    controller._controlledWritableStream = stream;
+    stream._writableStreamController = controller;
+    // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.
+    controller._queue = undefined;
+    controller._queueTotalSize = undefined;
+    ResetQueue(controller);
+    controller._abortReason = undefined;
+    controller._abortController = createAbortController();
+    controller._started = false;
+    controller._strategySizeAlgorithm = sizeAlgorithm;
+    controller._strategyHWM = highWaterMark;
+    controller._writeAlgorithm = writeAlgorithm;
+    controller._closeAlgorithm = closeAlgorithm;
+    controller._abortAlgorithm = abortAlgorithm;
+    var backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+    WritableStreamUpdateBackpressure(stream, backpressure);
+    var startResult = startAlgorithm();
+    var startPromise = promiseResolvedWith(startResult);
+    uponPromise(startPromise, function () {
+        controller._started = true;
+        WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+    }, function (r) {
+        controller._started = true;
+        WritableStreamDealWithRejection(stream, r);
+    });
+}
+function SetUpWritableStreamDefaultControllerFromUnderlyingSink(stream, underlyingSink, highWaterMark, sizeAlgorithm) {
+    var controller = Object.create(WritableStreamDefaultController.prototype);
+    var startAlgorithm = function () { return undefined; };
+    var writeAlgorithm = function () { return promiseResolvedWith(undefined); };
+    var closeAlgorithm = function () { return promiseResolvedWith(undefined); };
+    var abortAlgorithm = function () { return promiseResolvedWith(undefined); };
+    if (underlyingSink.start !== undefined) {
+        startAlgorithm = function () { return underlyingSink.start(controller); };
+    }
+    if (underlyingSink.write !== undefined) {
+        writeAlgorithm = function (chunk) { return underlyingSink.write(chunk, controller); };
+    }
+    if (underlyingSink.close !== undefined) {
+        closeAlgorithm = function () { return underlyingSink.close(); };
+    }
+    if (underlyingSink.abort !== undefined) {
+        abortAlgorithm = function (reason) { return underlyingSink.abort(reason); };
+    }
+    SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm);
+}
+// ClearAlgorithms may be called twice. Erroring the same stream in multiple ways will often result in redundant calls.
+function WritableStreamDefaultControllerClearAlgorithms(controller) {
+    controller._writeAlgorithm = undefined;
+    controller._closeAlgorithm = undefined;
+    controller._abortAlgorithm = undefined;
+    controller._strategySizeAlgorithm = undefined;
+}
+function WritableStreamDefaultControllerClose(controller) {
+    EnqueueValueWithSize(controller, closeSentinel, 0);
+    WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+}
+function WritableStreamDefaultControllerGetChunkSize(controller, chunk) {
+    try {
+        return controller._strategySizeAlgorithm(chunk);
+    }
+    catch (chunkSizeE) {
+        WritableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE);
+        return 1;
+    }
+}
+function WritableStreamDefaultControllerGetDesiredSize(controller) {
+    return controller._strategyHWM - controller._queueTotalSize;
+}
+function WritableStreamDefaultControllerWrite(controller, chunk, chunkSize) {
+    try {
+        EnqueueValueWithSize(controller, chunk, chunkSize);
+    }
+    catch (enqueueE) {
+        WritableStreamDefaultControllerErrorIfNeeded(controller, enqueueE);
+        return;
+    }
+    var stream = controller._controlledWritableStream;
+    if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._state === 'writable') {
+        var backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+        WritableStreamUpdateBackpressure(stream, backpressure);
+    }
+    WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+}
+// Abstract operations for the WritableStreamDefaultController.
+function WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller) {
+    var stream = controller._controlledWritableStream;
+    if (!controller._started) {
+        return;
+    }
+    if (stream._inFlightWriteRequest !== undefined) {
+        return;
+    }
+    var state = stream._state;
+    if (state === 'erroring') {
+        WritableStreamFinishErroring(stream);
+        return;
+    }
+    if (controller._queue.length === 0) {
+        return;
+    }
+    var value = PeekQueueValue(controller);
+    if (value === closeSentinel) {
+        WritableStreamDefaultControllerProcessClose(controller);
+    }
+    else {
+        WritableStreamDefaultControllerProcessWrite(controller, value);
+    }
+}
+function WritableStreamDefaultControllerErrorIfNeeded(controller, error) {
+    if (controller._controlledWritableStream._state === 'writable') {
+        WritableStreamDefaultControllerError(controller, error);
+    }
+}
+function WritableStreamDefaultControllerProcessClose(controller) {
+    var stream = controller._controlledWritableStream;
+    WritableStreamMarkCloseRequestInFlight(stream);
+    DequeueValue(controller);
+    var sinkClosePromise = controller._closeAlgorithm();
+    WritableStreamDefaultControllerClearAlgorithms(controller);
+    uponPromise(sinkClosePromise, function () {
+        WritableStreamFinishInFlightClose(stream);
+    }, function (reason) {
+        WritableStreamFinishInFlightCloseWithError(stream, reason);
+    });
+}
+function WritableStreamDefaultControllerProcessWrite(controller, chunk) {
+    var stream = controller._controlledWritableStream;
+    WritableStreamMarkFirstWriteRequestInFlight(stream);
+    var sinkWritePromise = controller._writeAlgorithm(chunk);
+    uponPromise(sinkWritePromise, function () {
+        WritableStreamFinishInFlightWrite(stream);
+        var state = stream._state;
+        DequeueValue(controller);
+        if (!WritableStreamCloseQueuedOrInFlight(stream) && state === 'writable') {
+            var backpressure = WritableStreamDefaultControllerGetBackpressure(controller);
+            WritableStreamUpdateBackpressure(stream, backpressure);
+        }
+        WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);
+    }, function (reason) {
+        if (stream._state === 'writable') {
+            WritableStreamDefaultControllerClearAlgorithms(controller);
+        }
+        WritableStreamFinishInFlightWriteWithError(stream, reason);
+    });
+}
+function WritableStreamDefaultControllerGetBackpressure(controller) {
+    var desiredSize = WritableStreamDefaultControllerGetDesiredSize(controller);
+    return desiredSize <= 0;
+}
+// A client of WritableStreamDefaultController may use these functions directly to bypass state check.
+function WritableStreamDefaultControllerError(controller, error) {
+    var stream = controller._controlledWritableStream;
+    WritableStreamDefaultControllerClearAlgorithms(controller);
+    WritableStreamStartErroring(stream, error);
+}
+// Helper functions for the WritableStream.
+function streamBrandCheckException$2(name) {
+    return new TypeError("WritableStream.prototype." + name + " can only be used on a WritableStream");
+}
+// Helper functions for the WritableStreamDefaultController.
+function defaultControllerBrandCheckException$2(name) {
+    return new TypeError("WritableStreamDefaultController.prototype." + name + " can only be used on a WritableStreamDefaultController");
+}
+// Helper functions for the WritableStreamDefaultWriter.
+function defaultWriterBrandCheckException(name) {
+    return new TypeError("WritableStreamDefaultWriter.prototype." + name + " can only be used on a WritableStreamDefaultWriter");
+}
+function defaultWriterLockException(name) {
+    return new TypeError('Cannot ' + name + ' a stream using a released writer');
+}
+function defaultWriterClosedPromiseInitialize(writer) {
+    writer._closedPromise = newPromise(function (resolve, reject) {
+        writer._closedPromise_resolve = resolve;
+        writer._closedPromise_reject = reject;
+        writer._closedPromiseState = 'pending';
+    });
+}
+function defaultWriterClosedPromiseInitializeAsRejected(writer, reason) {
+    defaultWriterClosedPromiseInitialize(writer);
+    defaultWriterClosedPromiseReject(writer, reason);
+}
+function defaultWriterClosedPromiseInitializeAsResolved(writer) {
+    defaultWriterClosedPromiseInitialize(writer);
+    defaultWriterClosedPromiseResolve(writer);
+}
+function defaultWriterClosedPromiseReject(writer, reason) {
+    if (writer._closedPromise_reject === undefined) {
+        return;
+    }
+    setPromiseIsHandledToTrue(writer._closedPromise);
+    writer._closedPromise_reject(reason);
+    writer._closedPromise_resolve = undefined;
+    writer._closedPromise_reject = undefined;
+    writer._closedPromiseState = 'rejected';
+}
+function defaultWriterClosedPromiseResetToRejected(writer, reason) {
+    defaultWriterClosedPromiseInitializeAsRejected(writer, reason);
+}
+function defaultWriterClosedPromiseResolve(writer) {
+    if (writer._closedPromise_resolve === undefined) {
+        return;
+    }
+    writer._closedPromise_resolve(undefined);
+    writer._closedPromise_resolve = undefined;
+    writer._closedPromise_reject = undefined;
+    writer._closedPromiseState = 'resolved';
+}
+function defaultWriterReadyPromiseInitialize(writer) {
+    writer._readyPromise = newPromise(function (resolve, reject) {
+        writer._readyPromise_resolve = resolve;
+        writer._readyPromise_reject = reject;
+    });
+    writer._readyPromiseState = 'pending';
+}
+function defaultWriterReadyPromiseInitializeAsRejected(writer, reason) {
+    defaultWriterReadyPromiseInitialize(writer);
+    defaultWriterReadyPromiseReject(writer, reason);
+}
+function defaultWriterReadyPromiseInitializeAsResolved(writer) {
+    defaultWriterReadyPromiseInitialize(writer);
+    defaultWriterReadyPromiseResolve(writer);
+}
+function defaultWriterReadyPromiseReject(writer, reason) {
+    if (writer._readyPromise_reject === undefined) {
+        return;
+    }
+    setPromiseIsHandledToTrue(writer._readyPromise);
+    writer._readyPromise_reject(reason);
+    writer._readyPromise_resolve = undefined;
+    writer._readyPromise_reject = undefined;
+    writer._readyPromiseState = 'rejected';
+}
+function defaultWriterReadyPromiseReset(writer) {
+    defaultWriterReadyPromiseInitialize(writer);
+}
+function defaultWriterReadyPromiseResetToRejected(writer, reason) {
+    defaultWriterReadyPromiseInitializeAsRejected(writer, reason);
+}
+function defaultWriterReadyPromiseResolve(writer) {
+    if (writer._readyPromise_resolve === undefined) {
+        return;
+    }
+    writer._readyPromise_resolve(undefined);
+    writer._readyPromise_resolve = undefined;
+    writer._readyPromise_reject = undefined;
+    writer._readyPromiseState = 'fulfilled';
+}
+
+/// <reference lib="dom" />
+var NativeDOMException = typeof DOMException !== 'undefined' ? DOMException : undefined;
+
+/// <reference types="node" />
+function isDOMExceptionConstructor(ctor) {
+    if (!(typeof ctor === 'function' || typeof ctor === 'object')) {
+        return false;
+    }
+    try {
+        new ctor();
+        return true;
+    }
+    catch (_a) {
+        return false;
+    }
+}
+function createDOMExceptionPolyfill() {
+    // eslint-disable-next-line no-shadow
+    var ctor = function DOMException(message, name) {
+        this.message = message || '';
+        this.name = name || 'Error';
+        if (Error.captureStackTrace) {
+            Error.captureStackTrace(this, this.constructor);
+        }
+    };
+    ctor.prototype = Object.create(Error.prototype);
+    Object.defineProperty(ctor.prototype, 'constructor', { value: ctor, writable: true, configurable: true });
+    return ctor;
+}
+// eslint-disable-next-line no-redeclare
+var DOMException$1 = isDOMExceptionConstructor(NativeDOMException) ? NativeDOMException : createDOMExceptionPolyfill();
+
+function ReadableStreamPipeTo(source, dest, preventClose, preventAbort, preventCancel, signal) {
+    var reader = AcquireReadableStreamDefaultReader(source);
+    var writer = AcquireWritableStreamDefaultWriter(dest);
+    source._disturbed = true;
+    var shuttingDown = false;
+    // This is used to keep track of the spec's requirement that we wait for ongoing writes during shutdown.
+    var currentWrite = promiseResolvedWith(undefined);
+    return newPromise(function (resolve, reject) {
+        var abortAlgorithm;
+        if (signal !== undefined) {
+            abortAlgorithm = function () {
+                var error = new DOMException$1('Aborted', 'AbortError');
+                var actions = [];
+                if (!preventAbort) {
+                    actions.push(function () {
+                        if (dest._state === 'writable') {
+                            return WritableStreamAbort(dest, error);
+                        }
+                        return promiseResolvedWith(undefined);
+                    });
+                }
+                if (!preventCancel) {
+                    actions.push(function () {
+                        if (source._state === 'readable') {
+                            return ReadableStreamCancel(source, error);
+                        }
+                        return promiseResolvedWith(undefined);
+                    });
+                }
+                shutdownWithAction(function () { return Promise.all(actions.map(function (action) { return action(); })); }, true, error);
+            };
+            if (signal.aborted) {
+                abortAlgorithm();
+                return;
+            }
+            signal.addEventListener('abort', abortAlgorithm);
+        }
+        // Using reader and writer, read all chunks from this and write them to dest
+        // - Backpressure must be enforced
+        // - Shutdown must stop all activity
+        function pipeLoop() {
+            return newPromise(function (resolveLoop, rejectLoop) {
+                function next(done) {
+                    if (done) {
+                        resolveLoop();
+                    }
+                    else {
+                        // Use `PerformPromiseThen` instead of `uponPromise` to avoid
+                        // adding unnecessary `.catch(rethrowAssertionErrorRejection)` handlers
+                        PerformPromiseThen(pipeStep(), next, rejectLoop);
+                    }
+                }
+                next(false);
+            });
+        }
+        function pipeStep() {
+            if (shuttingDown) {
+                return promiseResolvedWith(true);
+            }
+            return PerformPromiseThen(writer._readyPromise, function () {
+                return newPromise(function (resolveRead, rejectRead) {
+                    ReadableStreamDefaultReaderRead(reader, {
+                        _chunkSteps: function (chunk) {
+                            currentWrite = PerformPromiseThen(WritableStreamDefaultWriterWrite(writer, chunk), undefined, noop);
+                            resolveRead(false);
+                        },
+                        _closeSteps: function () { return resolveRead(true); },
+                        _errorSteps: rejectRead
+                    });
+                });
+            });
+        }
+        // Errors must be propagated forward
+        isOrBecomesErrored(source, reader._closedPromise, function (storedError) {
+            if (!preventAbort) {
+                shutdownWithAction(function () { return WritableStreamAbort(dest, storedError); }, true, storedError);
+            }
+            else {
+                shutdown(true, storedError);
+            }
+        });
+        // Errors must be propagated backward
+        isOrBecomesErrored(dest, writer._closedPromise, function (storedError) {
+            if (!preventCancel) {
+                shutdownWithAction(function () { return ReadableStreamCancel(source, storedError); }, true, storedError);
+            }
+            else {
+                shutdown(true, storedError);
+            }
+        });
+        // Closing must be propagated forward
+        isOrBecomesClosed(source, reader._closedPromise, function () {
+            if (!preventClose) {
+                shutdownWithAction(function () { return WritableStreamDefaultWriterCloseWithErrorPropagation(writer); });
+            }
+            else {
+                shutdown();
+            }
+        });
+        // Closing must be propagated backward
+        if (WritableStreamCloseQueuedOrInFlight(dest) || dest._state === 'closed') {
+            var destClosed_1 = new TypeError('the destination writable stream closed before all data could be piped to it');
+            if (!preventCancel) {
+                shutdownWithAction(function () { return ReadableStreamCancel(source, destClosed_1); }, true, destClosed_1);
+            }
+            else {
+                shutdown(true, destClosed_1);
+            }
+        }
+        setPromiseIsHandledToTrue(pipeLoop());
+        function waitForWritesToFinish() {
+            // Another write may have started while we were waiting on this currentWrite, so we have to be sure to wait
+            // for that too.
+            var oldCurrentWrite = currentWrite;
+            return PerformPromiseThen(currentWrite, function () { return oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined; });
+        }
+        function isOrBecomesErrored(stream, promise, action) {
+            if (stream._state === 'errored') {
+                action(stream._storedError);
+            }
+            else {
+                uponRejection(promise, action);
+            }
+        }
+        function isOrBecomesClosed(stream, promise, action) {
+            if (stream._state === 'closed') {
+                action();
+            }
+            else {
+                uponFulfillment(promise, action);
+            }
+        }
+        function shutdownWithAction(action, originalIsError, originalError) {
+            if (shuttingDown) {
+                return;
+            }
+            shuttingDown = true;
+            if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {
+                uponFulfillment(waitForWritesToFinish(), doTheRest);
+            }
+            else {
+                doTheRest();
+            }
+            function doTheRest() {
+                uponPromise(action(), function () { return finalize(originalIsError, originalError); }, function (newError) { return finalize(true, newError); });
+            }
+        }
+        function shutdown(isError, error) {
+            if (shuttingDown) {
+                return;
+            }
+            shuttingDown = true;
+            if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {
+                uponFulfillment(waitForWritesToFinish(), function () { return finalize(isError, error); });
+            }
+            else {
+                finalize(isError, error);
+            }
+        }
+        function finalize(isError, error) {
+            WritableStreamDefaultWriterRelease(writer);
+            ReadableStreamReaderGenericRelease(reader);
+            if (signal !== undefined) {
+                signal.removeEventListener('abort', abortAlgorithm);
+            }
+            if (isError) {
+                reject(error);
+            }
+            else {
+                resolve(undefined);
+            }
+        }
+    });
+}
+
+/**
+ * Allows control of a {@link ReadableStream | readable stream}'s state and internal queue.
+ *
+ * @public
+ */
+var ReadableStreamDefaultController = /** @class */ (function () {
+    function ReadableStreamDefaultController() {
+        throw new TypeError('Illegal constructor');
+    }
+    Object.defineProperty(ReadableStreamDefaultController.prototype, "desiredSize", {
+        /**
+         * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is
+         * over-full. An underlying source ought to use this information to determine when and how to apply backpressure.
+         */
+        get: function () {
+            if (!IsReadableStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException$1('desiredSize');
+            }
+            return ReadableStreamDefaultControllerGetDesiredSize(this);
+        },
+        enumerable: false,
+        configurable: true
+    });
+    /**
+     * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from
+     * the stream, but once those are read, the stream will become closed.
+     */
+    ReadableStreamDefaultController.prototype.close = function () {
+        if (!IsReadableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$1('close');
+        }
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {
+            throw new TypeError('The stream is not in a state that permits close');
+        }
+        ReadableStreamDefaultControllerClose(this);
+    };
+    ReadableStreamDefaultController.prototype.enqueue = function (chunk) {
+        if (chunk === void 0) { chunk = undefined; }
+        if (!IsReadableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$1('enqueue');
+        }
+        if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {
+            throw new TypeError('The stream is not in a state that permits enqueue');
+        }
+        return ReadableStreamDefaultControllerEnqueue(this, chunk);
+    };
+    /**
+     * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.
+     */
+    ReadableStreamDefaultController.prototype.error = function (e) {
+        if (e === void 0) { e = undefined; }
+        if (!IsReadableStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException$1('error');
+        }
+        ReadableStreamDefaultControllerError(this, e);
+    };
+    /** @internal */
+    ReadableStreamDefaultController.prototype[CancelSteps] = function (reason) {
+        ResetQueue(this);
+        var result = this._cancelAlgorithm(reason);
+        ReadableStreamDefaultControllerClearAlgorithms(this);
+        return result;
+    };
+    /** @internal */
+    ReadableStreamDefaultController.prototype[PullSteps] = function (readRequest) {
+        var stream = this._controlledReadableStream;
+        if (this._queue.length > 0) {
+            var chunk = DequeueValue(this);
+            if (this._closeRequested && this._queue.length === 0) {
+                ReadableStreamDefaultControllerClearAlgorithms(this);
+                ReadableStreamClose(stream);
+            }
+            else {
+                ReadableStreamDefaultControllerCallPullIfNeeded(this);
+            }
+            readRequest._chunkSteps(chunk);
+        }
+        else {
+            ReadableStreamAddReadRequest(stream, readRequest);
+            ReadableStreamDefaultControllerCallPullIfNeeded(this);
+        }
+    };
+    return ReadableStreamDefaultController;
+}());
+Object.defineProperties(ReadableStreamDefaultController.prototype, {
+    close: { enumerable: true },
+    enqueue: { enumerable: true },
+    error: { enumerable: true },
+    desiredSize: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableStreamDefaultController',
+        configurable: true
+    });
+}
+// Abstract operations for the ReadableStreamDefaultController.
+function IsReadableStreamDefaultController(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableStream')) {
+        return false;
+    }
+    return x instanceof ReadableStreamDefaultController;
+}
+function ReadableStreamDefaultControllerCallPullIfNeeded(controller) {
+    var shouldPull = ReadableStreamDefaultControllerShouldCallPull(controller);
+    if (!shouldPull) {
+        return;
+    }
+    if (controller._pulling) {
+        controller._pullAgain = true;
+        return;
+    }
+    controller._pulling = true;
+    var pullPromise = controller._pullAlgorithm();
+    uponPromise(pullPromise, function () {
+        controller._pulling = false;
+        if (controller._pullAgain) {
+            controller._pullAgain = false;
+            ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+        }
+    }, function (e) {
+        ReadableStreamDefaultControllerError(controller, e);
+    });
+}
+function ReadableStreamDefaultControllerShouldCallPull(controller) {
+    var stream = controller._controlledReadableStream;
+    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+        return false;
+    }
+    if (!controller._started) {
+        return false;
+    }
+    if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+        return true;
+    }
+    var desiredSize = ReadableStreamDefaultControllerGetDesiredSize(controller);
+    if (desiredSize > 0) {
+        return true;
+    }
+    return false;
+}
+function ReadableStreamDefaultControllerClearAlgorithms(controller) {
+    controller._pullAlgorithm = undefined;
+    controller._cancelAlgorithm = undefined;
+    controller._strategySizeAlgorithm = undefined;
+}
+// A client of ReadableStreamDefaultController may use these functions directly to bypass state check.
+function ReadableStreamDefaultControllerClose(controller) {
+    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+        return;
+    }
+    var stream = controller._controlledReadableStream;
+    controller._closeRequested = true;
+    if (controller._queue.length === 0) {
+        ReadableStreamDefaultControllerClearAlgorithms(controller);
+        ReadableStreamClose(stream);
+    }
+}
+function ReadableStreamDefaultControllerEnqueue(controller, chunk) {
+    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {
+        return;
+    }
+    var stream = controller._controlledReadableStream;
+    if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {
+        ReadableStreamFulfillReadRequest(stream, chunk, false);
+    }
+    else {
+        var chunkSize = void 0;
+        try {
+            chunkSize = controller._strategySizeAlgorithm(chunk);
+        }
+        catch (chunkSizeE) {
+            ReadableStreamDefaultControllerError(controller, chunkSizeE);
+            throw chunkSizeE;
+        }
+        try {
+            EnqueueValueWithSize(controller, chunk, chunkSize);
+        }
+        catch (enqueueE) {
+            ReadableStreamDefaultControllerError(controller, enqueueE);
+            throw enqueueE;
+        }
+    }
+    ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+}
+function ReadableStreamDefaultControllerError(controller, e) {
+    var stream = controller._controlledReadableStream;
+    if (stream._state !== 'readable') {
+        return;
+    }
+    ResetQueue(controller);
+    ReadableStreamDefaultControllerClearAlgorithms(controller);
+    ReadableStreamError(stream, e);
+}
+function ReadableStreamDefaultControllerGetDesiredSize(controller) {
+    var state = controller._controlledReadableStream._state;
+    if (state === 'errored') {
+        return null;
+    }
+    if (state === 'closed') {
+        return 0;
+    }
+    return controller._strategyHWM - controller._queueTotalSize;
+}
+// This is used in the implementation of TransformStream.
+function ReadableStreamDefaultControllerHasBackpressure(controller) {
+    if (ReadableStreamDefaultControllerShouldCallPull(controller)) {
+        return false;
+    }
+    return true;
+}
+function ReadableStreamDefaultControllerCanCloseOrEnqueue(controller) {
+    var state = controller._controlledReadableStream._state;
+    if (!controller._closeRequested && state === 'readable') {
+        return true;
+    }
+    return false;
+}
+function SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm) {
+    controller._controlledReadableStream = stream;
+    controller._queue = undefined;
+    controller._queueTotalSize = undefined;
+    ResetQueue(controller);
+    controller._started = false;
+    controller._closeRequested = false;
+    controller._pullAgain = false;
+    controller._pulling = false;
+    controller._strategySizeAlgorithm = sizeAlgorithm;
+    controller._strategyHWM = highWaterMark;
+    controller._pullAlgorithm = pullAlgorithm;
+    controller._cancelAlgorithm = cancelAlgorithm;
+    stream._readableStreamController = controller;
+    var startResult = startAlgorithm();
+    uponPromise(promiseResolvedWith(startResult), function () {
+        controller._started = true;
+        ReadableStreamDefaultControllerCallPullIfNeeded(controller);
+    }, function (r) {
+        ReadableStreamDefaultControllerError(controller, r);
+    });
+}
+function SetUpReadableStreamDefaultControllerFromUnderlyingSource(stream, underlyingSource, highWaterMark, sizeAlgorithm) {
+    var controller = Object.create(ReadableStreamDefaultController.prototype);
+    var startAlgorithm = function () { return undefined; };
+    var pullAlgorithm = function () { return promiseResolvedWith(undefined); };
+    var cancelAlgorithm = function () { return promiseResolvedWith(undefined); };
+    if (underlyingSource.start !== undefined) {
+        startAlgorithm = function () { return underlyingSource.start(controller); };
+    }
+    if (underlyingSource.pull !== undefined) {
+        pullAlgorithm = function () { return underlyingSource.pull(controller); };
+    }
+    if (underlyingSource.cancel !== undefined) {
+        cancelAlgorithm = function (reason) { return underlyingSource.cancel(reason); };
+    }
+    SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm);
+}
+// Helper functions for the ReadableStreamDefaultController.
+function defaultControllerBrandCheckException$1(name) {
+    return new TypeError("ReadableStreamDefaultController.prototype." + name + " can only be used on a ReadableStreamDefaultController");
+}
+
+function ReadableStreamTee(stream, cloneForBranch2) {
+    if (IsReadableByteStreamController(stream._readableStreamController)) {
+        return ReadableByteStreamTee(stream);
+    }
+    return ReadableStreamDefaultTee(stream);
+}
+function ReadableStreamDefaultTee(stream, cloneForBranch2) {
+    var reader = AcquireReadableStreamDefaultReader(stream);
+    var reading = false;
+    var readAgain = false;
+    var canceled1 = false;
+    var canceled2 = false;
+    var reason1;
+    var reason2;
+    var branch1;
+    var branch2;
+    var resolveCancelPromise;
+    var cancelPromise = newPromise(function (resolve) {
+        resolveCancelPromise = resolve;
+    });
+    function pullAlgorithm() {
+        if (reading) {
+            readAgain = true;
+            return promiseResolvedWith(undefined);
+        }
+        reading = true;
+        var readRequest = {
+            _chunkSteps: function (chunk) {
+                // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                // successful synchronously-available reads get ahead of asynchronously-available errors.
+                queueMicrotask(function () {
+                    readAgain = false;
+                    var chunk1 = chunk;
+                    var chunk2 = chunk;
+                    // There is no way to access the cloning code right now in the reference implementation.
+                    // If we add one then we'll need an implementation for serializable objects.
+                    // if (!canceled2 && cloneForBranch2) {
+                    //   chunk2 = StructuredDeserialize(StructuredSerialize(chunk2));
+                    // }
+                    if (!canceled1) {
+                        ReadableStreamDefaultControllerEnqueue(branch1._readableStreamController, chunk1);
+                    }
+                    if (!canceled2) {
+                        ReadableStreamDefaultControllerEnqueue(branch2._readableStreamController, chunk2);
+                    }
+                    reading = false;
+                    if (readAgain) {
+                        pullAlgorithm();
+                    }
+                });
+            },
+            _closeSteps: function () {
+                reading = false;
+                if (!canceled1) {
+                    ReadableStreamDefaultControllerClose(branch1._readableStreamController);
+                }
+                if (!canceled2) {
+                    ReadableStreamDefaultControllerClose(branch2._readableStreamController);
+                }
+                if (!canceled1 || !canceled2) {
+                    resolveCancelPromise(undefined);
+                }
+            },
+            _errorSteps: function () {
+                reading = false;
+            }
+        };
+        ReadableStreamDefaultReaderRead(reader, readRequest);
+        return promiseResolvedWith(undefined);
+    }
+    function cancel1Algorithm(reason) {
+        canceled1 = true;
+        reason1 = reason;
+        if (canceled2) {
+            var compositeReason = CreateArrayFromList([reason1, reason2]);
+            var cancelResult = ReadableStreamCancel(stream, compositeReason);
+            resolveCancelPromise(cancelResult);
+        }
+        return cancelPromise;
+    }
+    function cancel2Algorithm(reason) {
+        canceled2 = true;
+        reason2 = reason;
+        if (canceled1) {
+            var compositeReason = CreateArrayFromList([reason1, reason2]);
+            var cancelResult = ReadableStreamCancel(stream, compositeReason);
+            resolveCancelPromise(cancelResult);
+        }
+        return cancelPromise;
+    }
+    function startAlgorithm() {
+        // do nothing
+    }
+    branch1 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel1Algorithm);
+    branch2 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel2Algorithm);
+    uponRejection(reader._closedPromise, function (r) {
+        ReadableStreamDefaultControllerError(branch1._readableStreamController, r);
+        ReadableStreamDefaultControllerError(branch2._readableStreamController, r);
+        if (!canceled1 || !canceled2) {
+            resolveCancelPromise(undefined);
+        }
+    });
+    return [branch1, branch2];
+}
+function ReadableByteStreamTee(stream) {
+    var reader = AcquireReadableStreamDefaultReader(stream);
+    var reading = false;
+    var readAgainForBranch1 = false;
+    var readAgainForBranch2 = false;
+    var canceled1 = false;
+    var canceled2 = false;
+    var reason1;
+    var reason2;
+    var branch1;
+    var branch2;
+    var resolveCancelPromise;
+    var cancelPromise = newPromise(function (resolve) {
+        resolveCancelPromise = resolve;
+    });
+    function forwardReaderError(thisReader) {
+        uponRejection(thisReader._closedPromise, function (r) {
+            if (thisReader !== reader) {
+                return;
+            }
+            ReadableByteStreamControllerError(branch1._readableStreamController, r);
+            ReadableByteStreamControllerError(branch2._readableStreamController, r);
+            if (!canceled1 || !canceled2) {
+                resolveCancelPromise(undefined);
+            }
+        });
+    }
+    function pullWithDefaultReader() {
+        if (IsReadableStreamBYOBReader(reader)) {
+            ReadableStreamReaderGenericRelease(reader);
+            reader = AcquireReadableStreamDefaultReader(stream);
+            forwardReaderError(reader);
+        }
+        var readRequest = {
+            _chunkSteps: function (chunk) {
+                // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                // successful synchronously-available reads get ahead of asynchronously-available errors.
+                queueMicrotask(function () {
+                    readAgainForBranch1 = false;
+                    readAgainForBranch2 = false;
+                    var chunk1 = chunk;
+                    var chunk2 = chunk;
+                    if (!canceled1 && !canceled2) {
+                        try {
+                            chunk2 = CloneAsUint8Array(chunk);
+                        }
+                        catch (cloneE) {
+                            ReadableByteStreamControllerError(branch1._readableStreamController, cloneE);
+                            ReadableByteStreamControllerError(branch2._readableStreamController, cloneE);
+                            resolveCancelPromise(ReadableStreamCancel(stream, cloneE));
+                            return;
+                        }
+                    }
+                    if (!canceled1) {
+                        ReadableByteStreamControllerEnqueue(branch1._readableStreamController, chunk1);
+                    }
+                    if (!canceled2) {
+                        ReadableByteStreamControllerEnqueue(branch2._readableStreamController, chunk2);
+                    }
+                    reading = false;
+                    if (readAgainForBranch1) {
+                        pull1Algorithm();
+                    }
+                    else if (readAgainForBranch2) {
+                        pull2Algorithm();
+                    }
+                });
+            },
+            _closeSteps: function () {
+                reading = false;
+                if (!canceled1) {
+                    ReadableByteStreamControllerClose(branch1._readableStreamController);
+                }
+                if (!canceled2) {
+                    ReadableByteStreamControllerClose(branch2._readableStreamController);
+                }
+                if (branch1._readableStreamController._pendingPullIntos.length > 0) {
+                    ReadableByteStreamControllerRespond(branch1._readableStreamController, 0);
+                }
+                if (branch2._readableStreamController._pendingPullIntos.length > 0) {
+                    ReadableByteStreamControllerRespond(branch2._readableStreamController, 0);
+                }
+                if (!canceled1 || !canceled2) {
+                    resolveCancelPromise(undefined);
+                }
+            },
+            _errorSteps: function () {
+                reading = false;
+            }
+        };
+        ReadableStreamDefaultReaderRead(reader, readRequest);
+    }
+    function pullWithBYOBReader(view, forBranch2) {
+        if (IsReadableStreamDefaultReader(reader)) {
+            ReadableStreamReaderGenericRelease(reader);
+            reader = AcquireReadableStreamBYOBReader(stream);
+            forwardReaderError(reader);
+        }
+        var byobBranch = forBranch2 ? branch2 : branch1;
+        var otherBranch = forBranch2 ? branch1 : branch2;
+        var readIntoRequest = {
+            _chunkSteps: function (chunk) {
+                // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using
+                // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let
+                // successful synchronously-available reads get ahead of asynchronously-available errors.
+                queueMicrotask(function () {
+                    readAgainForBranch1 = false;
+                    readAgainForBranch2 = false;
+                    var byobCanceled = forBranch2 ? canceled2 : canceled1;
+                    var otherCanceled = forBranch2 ? canceled1 : canceled2;
+                    if (!otherCanceled) {
+                        var clonedChunk = void 0;
+                        try {
+                            clonedChunk = CloneAsUint8Array(chunk);
+                        }
+                        catch (cloneE) {
+                            ReadableByteStreamControllerError(byobBranch._readableStreamController, cloneE);
+                            ReadableByteStreamControllerError(otherBranch._readableStreamController, cloneE);
+                            resolveCancelPromise(ReadableStreamCancel(stream, cloneE));
+                            return;
+                        }
+                        if (!byobCanceled) {
+                            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                        }
+                        ReadableByteStreamControllerEnqueue(otherBranch._readableStreamController, clonedChunk);
+                    }
+                    else if (!byobCanceled) {
+                        ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                    }
+                    reading = false;
+                    if (readAgainForBranch1) {
+                        pull1Algorithm();
+                    }
+                    else if (readAgainForBranch2) {
+                        pull2Algorithm();
+                    }
+                });
+            },
+            _closeSteps: function (chunk) {
+                reading = false;
+                var byobCanceled = forBranch2 ? canceled2 : canceled1;
+                var otherCanceled = forBranch2 ? canceled1 : canceled2;
+                if (!byobCanceled) {
+                    ReadableByteStreamControllerClose(byobBranch._readableStreamController);
+                }
+                if (!otherCanceled) {
+                    ReadableByteStreamControllerClose(otherBranch._readableStreamController);
+                }
+                if (chunk !== undefined) {
+                    if (!byobCanceled) {
+                        ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);
+                    }
+                    if (!otherCanceled && otherBranch._readableStreamController._pendingPullIntos.length > 0) {
+                        ReadableByteStreamControllerRespond(otherBranch._readableStreamController, 0);
+                    }
+                }
+                if (!byobCanceled || !otherCanceled) {
+                    resolveCancelPromise(undefined);
+                }
+            },
+            _errorSteps: function () {
+                reading = false;
+            }
+        };
+        ReadableStreamBYOBReaderRead(reader, view, readIntoRequest);
+    }
+    function pull1Algorithm() {
+        if (reading) {
+            readAgainForBranch1 = true;
+            return promiseResolvedWith(undefined);
+        }
+        reading = true;
+        var byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch1._readableStreamController);
+        if (byobRequest === null) {
+            pullWithDefaultReader();
+        }
+        else {
+            pullWithBYOBReader(byobRequest._view, false);
+        }
+        return promiseResolvedWith(undefined);
+    }
+    function pull2Algorithm() {
+        if (reading) {
+            readAgainForBranch2 = true;
+            return promiseResolvedWith(undefined);
+        }
+        reading = true;
+        var byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch2._readableStreamController);
+        if (byobRequest === null) {
+            pullWithDefaultReader();
+        }
+        else {
+            pullWithBYOBReader(byobRequest._view, true);
+        }
+        return promiseResolvedWith(undefined);
+    }
+    function cancel1Algorithm(reason) {
+        canceled1 = true;
+        reason1 = reason;
+        if (canceled2) {
+            var compositeReason = CreateArrayFromList([reason1, reason2]);
+            var cancelResult = ReadableStreamCancel(stream, compositeReason);
+            resolveCancelPromise(cancelResult);
+        }
+        return cancelPromise;
+    }
+    function cancel2Algorithm(reason) {
+        canceled2 = true;
+        reason2 = reason;
+        if (canceled1) {
+            var compositeReason = CreateArrayFromList([reason1, reason2]);
+            var cancelResult = ReadableStreamCancel(stream, compositeReason);
+            resolveCancelPromise(cancelResult);
+        }
+        return cancelPromise;
+    }
+    function startAlgorithm() {
+        return;
+    }
+    branch1 = CreateReadableByteStream(startAlgorithm, pull1Algorithm, cancel1Algorithm);
+    branch2 = CreateReadableByteStream(startAlgorithm, pull2Algorithm, cancel2Algorithm);
+    forwardReaderError(reader);
+    return [branch1, branch2];
+}
+
+function convertUnderlyingDefaultOrByteSource(source, context) {
+    assertDictionary(source, context);
+    var original = source;
+    var autoAllocateChunkSize = original === null || original === void 0 ? void 0 : original.autoAllocateChunkSize;
+    var cancel = original === null || original === void 0 ? void 0 : original.cancel;
+    var pull = original === null || original === void 0 ? void 0 : original.pull;
+    var start = original === null || original === void 0 ? void 0 : original.start;
+    var type = original === null || original === void 0 ? void 0 : original.type;
+    return {
+        autoAllocateChunkSize: autoAllocateChunkSize === undefined ?
+            undefined :
+            convertUnsignedLongLongWithEnforceRange(autoAllocateChunkSize, context + " has member 'autoAllocateChunkSize' that"),
+        cancel: cancel === undefined ?
+            undefined :
+            convertUnderlyingSourceCancelCallback(cancel, original, context + " has member 'cancel' that"),
+        pull: pull === undefined ?
+            undefined :
+            convertUnderlyingSourcePullCallback(pull, original, context + " has member 'pull' that"),
+        start: start === undefined ?
+            undefined :
+            convertUnderlyingSourceStartCallback(start, original, context + " has member 'start' that"),
+        type: type === undefined ? undefined : convertReadableStreamType(type, context + " has member 'type' that")
+    };
+}
+function convertUnderlyingSourceCancelCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return function (reason) { return promiseCall(fn, original, [reason]); };
+}
+function convertUnderlyingSourcePullCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return function (controller) { return promiseCall(fn, original, [controller]); };
+}
+function convertUnderlyingSourceStartCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return function (controller) { return reflectCall(fn, original, [controller]); };
+}
+function convertReadableStreamType(type, context) {
+    type = "" + type;
+    if (type !== 'bytes') {
+        throw new TypeError(context + " '" + type + "' is not a valid enumeration value for ReadableStreamType");
+    }
+    return type;
+}
+
+function convertReaderOptions(options, context) {
+    assertDictionary(options, context);
+    var mode = options === null || options === void 0 ? void 0 : options.mode;
+    return {
+        mode: mode === undefined ? undefined : convertReadableStreamReaderMode(mode, context + " has member 'mode' that")
+    };
+}
+function convertReadableStreamReaderMode(mode, context) {
+    mode = "" + mode;
+    if (mode !== 'byob') {
+        throw new TypeError(context + " '" + mode + "' is not a valid enumeration value for ReadableStreamReaderMode");
+    }
+    return mode;
+}
+
+function convertIteratorOptions(options, context) {
+    assertDictionary(options, context);
+    var preventCancel = options === null || options === void 0 ? void 0 : options.preventCancel;
+    return { preventCancel: Boolean(preventCancel) };
+}
+
+function convertPipeOptions(options, context) {
+    assertDictionary(options, context);
+    var preventAbort = options === null || options === void 0 ? void 0 : options.preventAbort;
+    var preventCancel = options === null || options === void 0 ? void 0 : options.preventCancel;
+    var preventClose = options === null || options === void 0 ? void 0 : options.preventClose;
+    var signal = options === null || options === void 0 ? void 0 : options.signal;
+    if (signal !== undefined) {
+        assertAbortSignal(signal, context + " has member 'signal' that");
+    }
+    return {
+        preventAbort: Boolean(preventAbort),
+        preventCancel: Boolean(preventCancel),
+        preventClose: Boolean(preventClose),
+        signal: signal
+    };
+}
+function assertAbortSignal(signal, context) {
+    if (!isAbortSignal(signal)) {
+        throw new TypeError(context + " is not an AbortSignal.");
+    }
+}
+
+function convertReadableWritablePair(pair, context) {
+    assertDictionary(pair, context);
+    var readable = pair === null || pair === void 0 ? void 0 : pair.readable;
+    assertRequiredField(readable, 'readable', 'ReadableWritablePair');
+    assertReadableStream(readable, context + " has member 'readable' that");
+    var writable = pair === null || pair === void 0 ? void 0 : pair.writable;
+    assertRequiredField(writable, 'writable', 'ReadableWritablePair');
+    assertWritableStream(writable, context + " has member 'writable' that");
+    return { readable: readable, writable: writable };
+}
+
+/**
+ * A readable stream represents a source of data, from which you can read.
+ *
+ * @public
+ */
+var ReadableStream = /** @class */ (function () {
+    function ReadableStream(rawUnderlyingSource, rawStrategy) {
+        if (rawUnderlyingSource === void 0) { rawUnderlyingSource = {}; }
+        if (rawStrategy === void 0) { rawStrategy = {}; }
+        if (rawUnderlyingSource === undefined) {
+            rawUnderlyingSource = null;
+        }
+        else {
+            assertObject(rawUnderlyingSource, 'First parameter');
+        }
+        var strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');
+        var underlyingSource = convertUnderlyingDefaultOrByteSource(rawUnderlyingSource, 'First parameter');
+        InitializeReadableStream(this);
+        if (underlyingSource.type === 'bytes') {
+            if (strategy.size !== undefined) {
+                throw new RangeError('The strategy for a byte stream cannot have a size function');
+            }
+            var highWaterMark = ExtractHighWaterMark(strategy, 0);
+            SetUpReadableByteStreamControllerFromUnderlyingSource(this, underlyingSource, highWaterMark);
+        }
+        else {
+            var sizeAlgorithm = ExtractSizeAlgorithm(strategy);
+            var highWaterMark = ExtractHighWaterMark(strategy, 1);
+            SetUpReadableStreamDefaultControllerFromUnderlyingSource(this, underlyingSource, highWaterMark, sizeAlgorithm);
+        }
+    }
+    Object.defineProperty(ReadableStream.prototype, "locked", {
+        /**
+         * Whether or not the readable stream is locked to a {@link ReadableStreamDefaultReader | reader}.
+         */
+        get: function () {
+            if (!IsReadableStream(this)) {
+                throw streamBrandCheckException$1('locked');
+            }
+            return IsReadableStreamLocked(this);
+        },
+        enumerable: false,
+        configurable: true
+    });
+    /**
+     * Cancels the stream, signaling a loss of interest in the stream by a consumer.
+     *
+     * The supplied `reason` argument will be given to the underlying source's {@link UnderlyingSource.cancel | cancel()}
+     * method, which might or might not use it.
+     */
+    ReadableStream.prototype.cancel = function (reason) {
+        if (reason === void 0) { reason = undefined; }
+        if (!IsReadableStream(this)) {
+            return promiseRejectedWith(streamBrandCheckException$1('cancel'));
+        }
+        if (IsReadableStreamLocked(this)) {
+            return promiseRejectedWith(new TypeError('Cannot cancel a stream that already has a reader'));
+        }
+        return ReadableStreamCancel(this, reason);
+    };
+    ReadableStream.prototype.getReader = function (rawOptions) {
+        if (rawOptions === void 0) { rawOptions = undefined; }
+        if (!IsReadableStream(this)) {
+            throw streamBrandCheckException$1('getReader');
+        }
+        var options = convertReaderOptions(rawOptions, 'First parameter');
+        if (options.mode === undefined) {
+            return AcquireReadableStreamDefaultReader(this);
+        }
+        return AcquireReadableStreamBYOBReader(this);
+    };
+    ReadableStream.prototype.pipeThrough = function (rawTransform, rawOptions) {
+        if (rawOptions === void 0) { rawOptions = {}; }
+        if (!IsReadableStream(this)) {
+            throw streamBrandCheckException$1('pipeThrough');
+        }
+        assertRequiredArgument(rawTransform, 1, 'pipeThrough');
+        var transform = convertReadableWritablePair(rawTransform, 'First parameter');
+        var options = convertPipeOptions(rawOptions, 'Second parameter');
+        if (IsReadableStreamLocked(this)) {
+            throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked ReadableStream');
+        }
+        if (IsWritableStreamLocked(transform.writable)) {
+            throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked WritableStream');
+        }
+        var promise = ReadableStreamPipeTo(this, transform.writable, options.preventClose, options.preventAbort, options.preventCancel, options.signal);
+        setPromiseIsHandledToTrue(promise);
+        return transform.readable;
+    };
+    ReadableStream.prototype.pipeTo = function (destination, rawOptions) {
+        if (rawOptions === void 0) { rawOptions = {}; }
+        if (!IsReadableStream(this)) {
+            return promiseRejectedWith(streamBrandCheckException$1('pipeTo'));
+        }
+        if (destination === undefined) {
+            return promiseRejectedWith("Parameter 1 is required in 'pipeTo'.");
+        }
+        if (!IsWritableStream(destination)) {
+            return promiseRejectedWith(new TypeError("ReadableStream.prototype.pipeTo's first argument must be a WritableStream"));
+        }
+        var options;
+        try {
+            options = convertPipeOptions(rawOptions, 'Second parameter');
+        }
+        catch (e) {
+            return promiseRejectedWith(e);
+        }
+        if (IsReadableStreamLocked(this)) {
+            return promiseRejectedWith(new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream'));
+        }
+        if (IsWritableStreamLocked(destination)) {
+            return promiseRejectedWith(new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream'));
+        }
+        return ReadableStreamPipeTo(this, destination, options.preventClose, options.preventAbort, options.preventCancel, options.signal);
+    };
+    /**
+     * Tees this readable stream, returning a two-element array containing the two resulting branches as
+     * new {@link ReadableStream} instances.
+     *
+     * Teeing a stream will lock it, preventing any other consumer from acquiring a reader.
+     * To cancel the stream, cancel both of the resulting branches; a composite cancellation reason will then be
+     * propagated to the stream's underlying source.
+     *
+     * Note that the chunks seen in each branch will be the same object. If the chunks are not immutable,
+     * this could allow interference between the two branches.
+     */
+    ReadableStream.prototype.tee = function () {
+        if (!IsReadableStream(this)) {
+            throw streamBrandCheckException$1('tee');
+        }
+        var branches = ReadableStreamTee(this);
+        return CreateArrayFromList(branches);
+    };
+    ReadableStream.prototype.values = function (rawOptions) {
+        if (rawOptions === void 0) { rawOptions = undefined; }
+        if (!IsReadableStream(this)) {
+            throw streamBrandCheckException$1('values');
+        }
+        var options = convertIteratorOptions(rawOptions, 'First parameter');
+        return AcquireReadableStreamAsyncIterator(this, options.preventCancel);
+    };
+    return ReadableStream;
+}());
+Object.defineProperties(ReadableStream.prototype, {
+    cancel: { enumerable: true },
+    getReader: { enumerable: true },
+    pipeThrough: { enumerable: true },
+    pipeTo: { enumerable: true },
+    tee: { enumerable: true },
+    values: { enumerable: true },
+    locked: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ReadableStream.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ReadableStream',
+        configurable: true
+    });
+}
+if (typeof SymbolPolyfill.asyncIterator === 'symbol') {
+    Object.defineProperty(ReadableStream.prototype, SymbolPolyfill.asyncIterator, {
+        value: ReadableStream.prototype.values,
+        writable: true,
+        configurable: true
+    });
+}
+// Abstract operations for the ReadableStream.
+// Throws if and only if startAlgorithm throws.
+function CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm) {
+    if (highWaterMark === void 0) { highWaterMark = 1; }
+    if (sizeAlgorithm === void 0) { sizeAlgorithm = function () { return 1; }; }
+    var stream = Object.create(ReadableStream.prototype);
+    InitializeReadableStream(stream);
+    var controller = Object.create(ReadableStreamDefaultController.prototype);
+    SetUpReadableStreamDefaultController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm);
+    return stream;
+}
+// Throws if and only if startAlgorithm throws.
+function CreateReadableByteStream(startAlgorithm, pullAlgorithm, cancelAlgorithm) {
+    var stream = Object.create(ReadableStream.prototype);
+    InitializeReadableStream(stream);
+    var controller = Object.create(ReadableByteStreamController.prototype);
+    SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, 0, undefined);
+    return stream;
+}
+function InitializeReadableStream(stream) {
+    stream._state = 'readable';
+    stream._reader = undefined;
+    stream._storedError = undefined;
+    stream._disturbed = false;
+}
+function IsReadableStream(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_readableStreamController')) {
+        return false;
+    }
+    return x instanceof ReadableStream;
+}
+function IsReadableStreamLocked(stream) {
+    if (stream._reader === undefined) {
+        return false;
+    }
+    return true;
+}
+// ReadableStream API exposed for controllers.
+function ReadableStreamCancel(stream, reason) {
+    stream._disturbed = true;
+    if (stream._state === 'closed') {
+        return promiseResolvedWith(undefined);
+    }
+    if (stream._state === 'errored') {
+        return promiseRejectedWith(stream._storedError);
+    }
+    ReadableStreamClose(stream);
+    var reader = stream._reader;
+    if (reader !== undefined && IsReadableStreamBYOBReader(reader)) {
+        reader._readIntoRequests.forEach(function (readIntoRequest) {
+            readIntoRequest._closeSteps(undefined);
+        });
+        reader._readIntoRequests = new SimpleQueue();
+    }
+    var sourceCancelPromise = stream._readableStreamController[CancelSteps](reason);
+    return transformPromiseWith(sourceCancelPromise, noop);
+}
+function ReadableStreamClose(stream) {
+    stream._state = 'closed';
+    var reader = stream._reader;
+    if (reader === undefined) {
+        return;
+    }
+    defaultReaderClosedPromiseResolve(reader);
+    if (IsReadableStreamDefaultReader(reader)) {
+        reader._readRequests.forEach(function (readRequest) {
+            readRequest._closeSteps();
+        });
+        reader._readRequests = new SimpleQueue();
+    }
+}
+function ReadableStreamError(stream, e) {
+    stream._state = 'errored';
+    stream._storedError = e;
+    var reader = stream._reader;
+    if (reader === undefined) {
+        return;
+    }
+    defaultReaderClosedPromiseReject(reader, e);
+    if (IsReadableStreamDefaultReader(reader)) {
+        reader._readRequests.forEach(function (readRequest) {
+            readRequest._errorSteps(e);
+        });
+        reader._readRequests = new SimpleQueue();
+    }
+    else {
+        reader._readIntoRequests.forEach(function (readIntoRequest) {
+            readIntoRequest._errorSteps(e);
+        });
+        reader._readIntoRequests = new SimpleQueue();
+    }
+}
+// Helper functions for the ReadableStream.
+function streamBrandCheckException$1(name) {
+    return new TypeError("ReadableStream.prototype." + name + " can only be used on a ReadableStream");
+}
+
+function convertQueuingStrategyInit(init, context) {
+    assertDictionary(init, context);
+    var highWaterMark = init === null || init === void 0 ? void 0 : init.highWaterMark;
+    assertRequiredField(highWaterMark, 'highWaterMark', 'QueuingStrategyInit');
+    return {
+        highWaterMark: convertUnrestrictedDouble(highWaterMark)
+    };
+}
+
+// The size function must not have a prototype property nor be a constructor
+var byteLengthSizeFunction = function (chunk) {
+    return chunk.byteLength;
+};
+try {
+    Object.defineProperty(byteLengthSizeFunction, 'name', {
+        value: 'size',
+        configurable: true
+    });
+}
+catch (_a) {
+    // This property is non-configurable in older browsers, so ignore if this throws.
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility
+}
+/**
+ * A queuing strategy that counts the number of bytes in each chunk.
+ *
+ * @public
+ */
+var ByteLengthQueuingStrategy = /** @class */ (function () {
+    function ByteLengthQueuingStrategy(options) {
+        assertRequiredArgument(options, 1, 'ByteLengthQueuingStrategy');
+        options = convertQueuingStrategyInit(options, 'First parameter');
+        this._byteLengthQueuingStrategyHighWaterMark = options.highWaterMark;
+    }
+    Object.defineProperty(ByteLengthQueuingStrategy.prototype, "highWaterMark", {
+        /**
+         * Returns the high water mark provided to the constructor.
+         */
+        get: function () {
+            if (!IsByteLengthQueuingStrategy(this)) {
+                throw byteLengthBrandCheckException('highWaterMark');
+            }
+            return this._byteLengthQueuingStrategyHighWaterMark;
+        },
+        enumerable: false,
+        configurable: true
+    });
+    Object.defineProperty(ByteLengthQueuingStrategy.prototype, "size", {
+        /**
+         * Measures the size of `chunk` by returning the value of its `byteLength` property.
+         */
+        get: function () {
+            if (!IsByteLengthQueuingStrategy(this)) {
+                throw byteLengthBrandCheckException('size');
+            }
+            return byteLengthSizeFunction;
+        },
+        enumerable: false,
+        configurable: true
+    });
+    return ByteLengthQueuingStrategy;
+}());
+Object.defineProperties(ByteLengthQueuingStrategy.prototype, {
+    highWaterMark: { enumerable: true },
+    size: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(ByteLengthQueuingStrategy.prototype, SymbolPolyfill.toStringTag, {
+        value: 'ByteLengthQueuingStrategy',
+        configurable: true
+    });
+}
+// Helper functions for the ByteLengthQueuingStrategy.
+function byteLengthBrandCheckException(name) {
+    return new TypeError("ByteLengthQueuingStrategy.prototype." + name + " can only be used on a ByteLengthQueuingStrategy");
+}
+function IsByteLengthQueuingStrategy(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_byteLengthQueuingStrategyHighWaterMark')) {
+        return false;
+    }
+    return x instanceof ByteLengthQueuingStrategy;
+}
+
+// The size function must not have a prototype property nor be a constructor
+var countSizeFunction = function () {
+    return 1;
+};
+try {
+    Object.defineProperty(countSizeFunction, 'name', {
+        value: 'size',
+        configurable: true
+    });
+}
+catch (_a) {
+    // This property is non-configurable in older browsers, so ignore if this throws.
+    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility
+}
+/**
+ * A queuing strategy that counts the number of chunks.
+ *
+ * @public
+ */
+var CountQueuingStrategy = /** @class */ (function () {
+    function CountQueuingStrategy(options) {
+        assertRequiredArgument(options, 1, 'CountQueuingStrategy');
+        options = convertQueuingStrategyInit(options, 'First parameter');
+        this._countQueuingStrategyHighWaterMark = options.highWaterMark;
+    }
+    Object.defineProperty(CountQueuingStrategy.prototype, "highWaterMark", {
+        /**
+         * Returns the high water mark provided to the constructor.
+         */
+        get: function () {
+            if (!IsCountQueuingStrategy(this)) {
+                throw countBrandCheckException('highWaterMark');
+            }
+            return this._countQueuingStrategyHighWaterMark;
+        },
+        enumerable: false,
+        configurable: true
+    });
+    Object.defineProperty(CountQueuingStrategy.prototype, "size", {
+        /**
+         * Measures the size of `chunk` by always returning 1.
+         * This ensures that the total queue size is a count of the number of chunks in the queue.
+         */
+        get: function () {
+            if (!IsCountQueuingStrategy(this)) {
+                throw countBrandCheckException('size');
+            }
+            return countSizeFunction;
+        },
+        enumerable: false,
+        configurable: true
+    });
+    return CountQueuingStrategy;
+}());
+Object.defineProperties(CountQueuingStrategy.prototype, {
+    highWaterMark: { enumerable: true },
+    size: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(CountQueuingStrategy.prototype, SymbolPolyfill.toStringTag, {
+        value: 'CountQueuingStrategy',
+        configurable: true
+    });
+}
+// Helper functions for the CountQueuingStrategy.
+function countBrandCheckException(name) {
+    return new TypeError("CountQueuingStrategy.prototype." + name + " can only be used on a CountQueuingStrategy");
+}
+function IsCountQueuingStrategy(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_countQueuingStrategyHighWaterMark')) {
+        return false;
+    }
+    return x instanceof CountQueuingStrategy;
+}
+
+function convertTransformer(original, context) {
+    assertDictionary(original, context);
+    var flush = original === null || original === void 0 ? void 0 : original.flush;
+    var readableType = original === null || original === void 0 ? void 0 : original.readableType;
+    var start = original === null || original === void 0 ? void 0 : original.start;
+    var transform = original === null || original === void 0 ? void 0 : original.transform;
+    var writableType = original === null || original === void 0 ? void 0 : original.writableType;
+    return {
+        flush: flush === undefined ?
+            undefined :
+            convertTransformerFlushCallback(flush, original, context + " has member 'flush' that"),
+        readableType: readableType,
+        start: start === undefined ?
+            undefined :
+            convertTransformerStartCallback(start, original, context + " has member 'start' that"),
+        transform: transform === undefined ?
+            undefined :
+            convertTransformerTransformCallback(transform, original, context + " has member 'transform' that"),
+        writableType: writableType
+    };
+}
+function convertTransformerFlushCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return function (controller) { return promiseCall(fn, original, [controller]); };
+}
+function convertTransformerStartCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return function (controller) { return reflectCall(fn, original, [controller]); };
+}
+function convertTransformerTransformCallback(fn, original, context) {
+    assertFunction(fn, context);
+    return function (chunk, controller) { return promiseCall(fn, original, [chunk, controller]); };
+}
+
+// Class TransformStream
+/**
+ * A transform stream consists of a pair of streams: a {@link WritableStream | writable stream},
+ * known as its writable side, and a {@link ReadableStream | readable stream}, known as its readable side.
+ * In a manner specific to the transform stream in question, writes to the writable side result in new data being
+ * made available for reading from the readable side.
+ *
+ * @public
+ */
+var TransformStream = /** @class */ (function () {
+    function TransformStream(rawTransformer, rawWritableStrategy, rawReadableStrategy) {
+        if (rawTransformer === void 0) { rawTransformer = {}; }
+        if (rawWritableStrategy === void 0) { rawWritableStrategy = {}; }
+        if (rawReadableStrategy === void 0) { rawReadableStrategy = {}; }
+        if (rawTransformer === undefined) {
+            rawTransformer = null;
+        }
+        var writableStrategy = convertQueuingStrategy(rawWritableStrategy, 'Second parameter');
+        var readableStrategy = convertQueuingStrategy(rawReadableStrategy, 'Third parameter');
+        var transformer = convertTransformer(rawTransformer, 'First parameter');
+        if (transformer.readableType !== undefined) {
+            throw new RangeError('Invalid readableType specified');
+        }
+        if (transformer.writableType !== undefined) {
+            throw new RangeError('Invalid writableType specified');
+        }
+        var readableHighWaterMark = ExtractHighWaterMark(readableStrategy, 0);
+        var readableSizeAlgorithm = ExtractSizeAlgorithm(readableStrategy);
+        var writableHighWaterMark = ExtractHighWaterMark(writableStrategy, 1);
+        var writableSizeAlgorithm = ExtractSizeAlgorithm(writableStrategy);
+        var startPromise_resolve;
+        var startPromise = newPromise(function (resolve) {
+            startPromise_resolve = resolve;
+        });
+        InitializeTransformStream(this, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm);
+        SetUpTransformStreamDefaultControllerFromTransformer(this, transformer);
+        if (transformer.start !== undefined) {
+            startPromise_resolve(transformer.start(this._transformStreamController));
+        }
+        else {
+            startPromise_resolve(undefined);
+        }
+    }
+    Object.defineProperty(TransformStream.prototype, "readable", {
+        /**
+         * The readable side of the transform stream.
+         */
+        get: function () {
+            if (!IsTransformStream(this)) {
+                throw streamBrandCheckException('readable');
+            }
+            return this._readable;
+        },
+        enumerable: false,
+        configurable: true
+    });
+    Object.defineProperty(TransformStream.prototype, "writable", {
+        /**
+         * The writable side of the transform stream.
+         */
+        get: function () {
+            if (!IsTransformStream(this)) {
+                throw streamBrandCheckException('writable');
+            }
+            return this._writable;
+        },
+        enumerable: false,
+        configurable: true
+    });
+    return TransformStream;
+}());
+Object.defineProperties(TransformStream.prototype, {
+    readable: { enumerable: true },
+    writable: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(TransformStream.prototype, SymbolPolyfill.toStringTag, {
+        value: 'TransformStream',
+        configurable: true
+    });
+}
+function InitializeTransformStream(stream, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm) {
+    function startAlgorithm() {
+        return startPromise;
+    }
+    function writeAlgorithm(chunk) {
+        return TransformStreamDefaultSinkWriteAlgorithm(stream, chunk);
+    }
+    function abortAlgorithm(reason) {
+        return TransformStreamDefaultSinkAbortAlgorithm(stream, reason);
+    }
+    function closeAlgorithm() {
+        return TransformStreamDefaultSinkCloseAlgorithm(stream);
+    }
+    stream._writable = CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, writableHighWaterMark, writableSizeAlgorithm);
+    function pullAlgorithm() {
+        return TransformStreamDefaultSourcePullAlgorithm(stream);
+    }
+    function cancelAlgorithm(reason) {
+        TransformStreamErrorWritableAndUnblockWrite(stream, reason);
+        return promiseResolvedWith(undefined);
+    }
+    stream._readable = CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, readableHighWaterMark, readableSizeAlgorithm);
+    // The [[backpressure]] slot is set to undefined so that it can be initialised by TransformStreamSetBackpressure.
+    stream._backpressure = undefined;
+    stream._backpressureChangePromise = undefined;
+    stream._backpressureChangePromise_resolve = undefined;
+    TransformStreamSetBackpressure(stream, true);
+    stream._transformStreamController = undefined;
+}
+function IsTransformStream(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_transformStreamController')) {
+        return false;
+    }
+    return x instanceof TransformStream;
+}
+// This is a no-op if both sides are already errored.
+function TransformStreamError(stream, e) {
+    ReadableStreamDefaultControllerError(stream._readable._readableStreamController, e);
+    TransformStreamErrorWritableAndUnblockWrite(stream, e);
+}
+function TransformStreamErrorWritableAndUnblockWrite(stream, e) {
+    TransformStreamDefaultControllerClearAlgorithms(stream._transformStreamController);
+    WritableStreamDefaultControllerErrorIfNeeded(stream._writable._writableStreamController, e);
+    if (stream._backpressure) {
+        // Pretend that pull() was called to permit any pending write() calls to complete. TransformStreamSetBackpressure()
+        // cannot be called from enqueue() or pull() once the ReadableStream is errored, so this will will be the final time
+        // _backpressure is set.
+        TransformStreamSetBackpressure(stream, false);
+    }
+}
+function TransformStreamSetBackpressure(stream, backpressure) {
+    // Passes also when called during construction.
+    if (stream._backpressureChangePromise !== undefined) {
+        stream._backpressureChangePromise_resolve();
+    }
+    stream._backpressureChangePromise = newPromise(function (resolve) {
+        stream._backpressureChangePromise_resolve = resolve;
+    });
+    stream._backpressure = backpressure;
+}
+// Class TransformStreamDefaultController
+/**
+ * Allows control of the {@link ReadableStream} and {@link WritableStream} of the associated {@link TransformStream}.
+ *
+ * @public
+ */
+var TransformStreamDefaultController = /** @class */ (function () {
+    function TransformStreamDefaultController() {
+        throw new TypeError('Illegal constructor');
+    }
+    Object.defineProperty(TransformStreamDefaultController.prototype, "desiredSize", {
+        /**
+         * Returns the desired size to fill the readable side’s internal queue. It can be negative, if the queue is over-full.
+         */
+        get: function () {
+            if (!IsTransformStreamDefaultController(this)) {
+                throw defaultControllerBrandCheckException('desiredSize');
+            }
+            var readableController = this._controlledTransformStream._readable._readableStreamController;
+            return ReadableStreamDefaultControllerGetDesiredSize(readableController);
+        },
+        enumerable: false,
+        configurable: true
+    });
+    TransformStreamDefaultController.prototype.enqueue = function (chunk) {
+        if (chunk === void 0) { chunk = undefined; }
+        if (!IsTransformStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException('enqueue');
+        }
+        TransformStreamDefaultControllerEnqueue(this, chunk);
+    };
+    /**
+     * Errors both the readable side and the writable side of the controlled transform stream, making all future
+     * interactions with it fail with the given error `e`. Any chunks queued for transformation will be discarded.
+     */
+    TransformStreamDefaultController.prototype.error = function (reason) {
+        if (reason === void 0) { reason = undefined; }
+        if (!IsTransformStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException('error');
+        }
+        TransformStreamDefaultControllerError(this, reason);
+    };
+    /**
+     * Closes the readable side and errors the writable side of the controlled transform stream. This is useful when the
+     * transformer only needs to consume a portion of the chunks written to the writable side.
+     */
+    TransformStreamDefaultController.prototype.terminate = function () {
+        if (!IsTransformStreamDefaultController(this)) {
+            throw defaultControllerBrandCheckException('terminate');
+        }
+        TransformStreamDefaultControllerTerminate(this);
+    };
+    return TransformStreamDefaultController;
+}());
+Object.defineProperties(TransformStreamDefaultController.prototype, {
+    enqueue: { enumerable: true },
+    error: { enumerable: true },
+    terminate: { enumerable: true },
+    desiredSize: { enumerable: true }
+});
+if (typeof SymbolPolyfill.toStringTag === 'symbol') {
+    Object.defineProperty(TransformStreamDefaultController.prototype, SymbolPolyfill.toStringTag, {
+        value: 'TransformStreamDefaultController',
+        configurable: true
+    });
+}
+// Transform Stream Default Controller Abstract Operations
+function IsTransformStreamDefaultController(x) {
+    if (!typeIsObject(x)) {
+        return false;
+    }
+    if (!Object.prototype.hasOwnProperty.call(x, '_controlledTransformStream')) {
+        return false;
+    }
+    return x instanceof TransformStreamDefaultController;
+}
+function SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm) {
+    controller._controlledTransformStream = stream;
+    stream._transformStreamController = controller;
+    controller._transformAlgorithm = transformAlgorithm;
+    controller._flushAlgorithm = flushAlgorithm;
+}
+function SetUpTransformStreamDefaultControllerFromTransformer(stream, transformer) {
+    var controller = Object.create(TransformStreamDefaultController.prototype);
+    var transformAlgorithm = function (chunk) {
+        try {
+            TransformStreamDefaultControllerEnqueue(controller, chunk);
+            return promiseResolvedWith(undefined);
+        }
+        catch (transformResultE) {
+            return promiseRejectedWith(transformResultE);
+        }
+    };
+    var flushAlgorithm = function () { return promiseResolvedWith(undefined); };
+    if (transformer.transform !== undefined) {
+        transformAlgorithm = function (chunk) { return transformer.transform(chunk, controller); };
+    }
+    if (transformer.flush !== undefined) {
+        flushAlgorithm = function () { return transformer.flush(controller); };
+    }
+    SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);
+}
+function TransformStreamDefaultControllerClearAlgorithms(controller) {
+    controller._transformAlgorithm = undefined;
+    controller._flushAlgorithm = undefined;
+}
+function TransformStreamDefaultControllerEnqueue(controller, chunk) {
+    var stream = controller._controlledTransformStream;
+    var readableController = stream._readable._readableStreamController;
+    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(readableController)) {
+        throw new TypeError('Readable side is not in a state that permits enqueue');
+    }
+    // We throttle transform invocations based on the backpressure of the ReadableStream, but we still
+    // accept TransformStreamDefaultControllerEnqueue() calls.
+    try {
+        ReadableStreamDefaultControllerEnqueue(readableController, chunk);
+    }
+    catch (e) {
+        // This happens when readableStrategy.size() throws.
+        TransformStreamErrorWritableAndUnblockWrite(stream, e);
+        throw stream._readable._storedError;
+    }
+    var backpressure = ReadableStreamDefaultControllerHasBackpressure(readableController);
+    if (backpressure !== stream._backpressure) {
+        TransformStreamSetBackpressure(stream, true);
+    }
+}
+function TransformStreamDefaultControllerError(controller, e) {
+    TransformStreamError(controller._controlledTransformStream, e);
+}
+function TransformStreamDefaultControllerPerformTransform(controller, chunk) {
+    var transformPromise = controller._transformAlgorithm(chunk);
+    return transformPromiseWith(transformPromise, undefined, function (r) {
+        TransformStreamError(controller._controlledTransformStream, r);
+        throw r;
+    });
+}
+function TransformStreamDefaultControllerTerminate(controller) {
+    var stream = controller._controlledTransformStream;
+    var readableController = stream._readable._readableStreamController;
+    ReadableStreamDefaultControllerClose(readableController);
+    var error = new TypeError('TransformStream terminated');
+    TransformStreamErrorWritableAndUnblockWrite(stream, error);
+}
+// TransformStreamDefaultSink Algorithms
+function TransformStreamDefaultSinkWriteAlgorithm(stream, chunk) {
+    var controller = stream._transformStreamController;
+    if (stream._backpressure) {
+        var backpressureChangePromise = stream._backpressureChangePromise;
+        return transformPromiseWith(backpressureChangePromise, function () {
+            var writable = stream._writable;
+            var state = writable._state;
+            if (state === 'erroring') {
+                throw writable._storedError;
+            }
+            return TransformStreamDefaultControllerPerformTransform(controller, chunk);
+        });
+    }
+    return TransformStreamDefaultControllerPerformTransform(controller, chunk);
+}
+function TransformStreamDefaultSinkAbortAlgorithm(stream, reason) {
+    // abort() is not called synchronously, so it is possible for abort() to be called when the stream is already
+    // errored.
+    TransformStreamError(stream, reason);
+    return promiseResolvedWith(undefined);
+}
+function TransformStreamDefaultSinkCloseAlgorithm(stream) {
+    // stream._readable cannot change after construction, so caching it across a call to user code is safe.
+    var readable = stream._readable;
+    var controller = stream._transformStreamController;
+    var flushPromise = controller._flushAlgorithm();
+    TransformStreamDefaultControllerClearAlgorithms(controller);
+    // Return a promise that is fulfilled with undefined on success.
+    return transformPromiseWith(flushPromise, function () {
+        if (readable._state === 'errored') {
+            throw readable._storedError;
+        }
+        ReadableStreamDefaultControllerClose(readable._readableStreamController);
+    }, function (r) {
+        TransformStreamError(stream, r);
+        throw readable._storedError;
+    });
+}
+// TransformStreamDefaultSource Algorithms
+function TransformStreamDefaultSourcePullAlgorithm(stream) {
+    // Invariant. Enforced by the promises returned by start() and pull().
+    TransformStreamSetBackpressure(stream, false);
+    // Prevent the next pull() call until there is backpressure.
+    return stream._backpressureChangePromise;
+}
+// Helper functions for the TransformStreamDefaultController.
+function defaultControllerBrandCheckException(name) {
+    return new TypeError("TransformStreamDefaultController.prototype." + name + " can only be used on a TransformStreamDefaultController");
+}
+// Helper functions for the TransformStream.
+function streamBrandCheckException(name) {
+    return new TypeError("TransformStream.prototype." + name + " can only be used on a TransformStream");
+}
+
+export { ByteLengthQueuingStrategy, CountQueuingStrategy, ReadableByteStreamController, ReadableStream, ReadableStreamBYOBReader, ReadableStreamBYOBRequest, ReadableStreamDefaultController, ReadableStreamDefaultReader, TransformStream, TransformStreamDefaultController, WritableStream, WritableStreamDefaultController, WritableStreamDefaultWriter };
+//# sourceMappingURL=ponyfill.mjs.map
diff --git a/node_modules/web-streams-polyfill/dist/ponyfill.mjs.map b/node_modules/web-streams-polyfill/dist/ponyfill.mjs.map
new file mode 100644
index 0000000..2d74a3a
--- /dev/null
+++ b/node_modules/web-streams-polyfill/dist/ponyfill.mjs.map
@@ -0,0 +1 @@
+{"version":3,"file":"ponyfill.mjs","sources":["../src/stub/symbol.ts","../src/utils.ts","../src/lib/helpers/miscellaneous.ts","../src/lib/helpers/webidl.ts","../src/lib/simple-queue.ts","../src/lib/readable-stream/generic-reader.ts","../src/lib/abstract-ops/internal-methods.ts","../src/stub/number-isfinite.ts","../src/stub/math-trunc.ts","../src/lib/validators/basic.ts","../src/lib/validators/readable-stream.ts","../src/lib/readable-stream/default-reader.ts","../src/target/es5/stub/async-iterator-prototype.ts","../src/lib/readable-stream/async-iterator.ts","../src/stub/number-isnan.ts","../src/lib/abstract-ops/ecmascript.ts","../src/lib/abstract-ops/miscellaneous.ts","../src/lib/abstract-ops/queue-with-sizes.ts","../src/lib/readable-stream/byte-stream-controller.ts","../src/lib/readable-stream/byob-reader.ts","../src/lib/abstract-ops/queuing-strategy.ts","../src/lib/validators/queuing-strategy.ts","../src/lib/validators/underlying-sink.ts","../src/lib/validators/writable-stream.ts","../src/lib/abort-signal.ts","../src/lib/writable-stream.ts","../src/stub/native.ts","../src/stub/dom-exception.ts","../src/lib/readable-stream/pipe.ts","../src/lib/readable-stream/default-controller.ts","../src/lib/readable-stream/tee.ts","../src/lib/validators/underlying-source.ts","../src/lib/validators/reader-options.ts","../src/lib/validators/iterator-options.ts","../src/lib/validators/pipe-options.ts","../src/lib/validators/readable-writable-pair.ts","../src/lib/readable-stream.ts","../src/lib/validators/queuing-strategy-init.ts","../src/lib/byte-length-queuing-strategy.ts","../src/lib/count-queuing-strategy.ts","../src/lib/validators/transformer.ts","../src/lib/transform-stream.ts"],"sourcesContent":["/// <reference lib=\"es2015.symbol\" />\n\nconst SymbolPolyfill: (description?: string) => symbol =\n  typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol' ?\n    Symbol :\n    description => `Symbol(${description})` as any as symbol;\n\nexport default SymbolPolyfill;\n","/// <reference lib=\"dom\" />\n\nexport function noop(): undefined {\n  return undefined;\n}\n\nfunction getGlobals() {\n  if (typeof self !== 'undefined') {\n    return self;\n  } else if (typeof window !== 'undefined') {\n    return window;\n  } else if (typeof global !== 'undefined') {\n    return global;\n  }\n  return undefined;\n}\n\nexport const globals = getGlobals();\n","import { noop } from '../../utils';\nimport { AssertionError } from '../../stub/assert';\n\nexport function typeIsObject(x: any): x is object {\n  return (typeof x === 'object' && x !== null) || typeof x === 'function';\n}\n\nexport const rethrowAssertionErrorRejection: (e: any) => void =\n  DEBUG ? e => {\n    // Used throughout the reference implementation, as `.catch(rethrowAssertionErrorRejection)`, to ensure any errors\n    // get shown. There are places in the spec where we do promise transformations and purposefully ignore or don't\n    // expect any errors, but assertion errors are always problematic.\n    if (e && e instanceof AssertionError) {\n      setTimeout(() => {\n        throw e;\n      }, 0);\n    }\n  } : noop;\n","import { globals } from '../../utils';\nimport { rethrowAssertionErrorRejection } from './miscellaneous';\nimport assert from '../../stub/assert';\n\nconst originalPromise = Promise;\nconst originalPromiseThen = Promise.prototype.then;\nconst originalPromiseResolve = Promise.resolve.bind(originalPromise);\nconst originalPromiseReject = Promise.reject.bind(originalPromise);\n\nexport function newPromise<T>(executor: (\n  resolve: (value: T | PromiseLike<T>) => void,\n  reject: (reason?: any) => void\n) => void): Promise<T> {\n  return new originalPromise(executor);\n}\n\nexport function promiseResolvedWith<T>(value: T | PromiseLike<T>): Promise<T> {\n  return originalPromiseResolve(value);\n}\n\nexport function promiseRejectedWith<T = never>(reason: any): Promise<T> {\n  return originalPromiseReject(reason);\n}\n\nexport function PerformPromiseThen<T, TResult1 = T, TResult2 = never>(\n  promise: Promise<T>,\n  onFulfilled?: (value: T) => TResult1 | PromiseLike<TResult1>,\n  onRejected?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2> {\n  // There doesn't appear to be any way to correctly emulate the behaviour from JavaScript, so this is just an\n  // approximation.\n  return originalPromiseThen.call(promise, onFulfilled, onRejected) as Promise<TResult1 | TResult2>;\n}\n\nexport function uponPromise<T>(\n  promise: Promise<T>,\n  onFulfilled?: (value: T) => void | PromiseLike<void>,\n  onRejected?: (reason: any) => void | PromiseLike<void>): void {\n  PerformPromiseThen(\n    PerformPromiseThen(promise, onFulfilled, onRejected),\n    undefined,\n    rethrowAssertionErrorRejection\n  );\n}\n\nexport function uponFulfillment<T>(promise: Promise<T>, onFulfilled: (value: T) => void | PromiseLike<void>): void {\n  uponPromise(promise, onFulfilled);\n}\n\nexport function uponRejection(promise: Promise<unknown>, onRejected: (reason: any) => void | PromiseLike<void>): void {\n  uponPromise(promise, undefined, onRejected);\n}\n\nexport function transformPromiseWith<T, TResult1 = T, TResult2 = never>(\n  promise: Promise<T>,\n  fulfillmentHandler?: (value: T) => TResult1 | PromiseLike<TResult1>,\n  rejectionHandler?: (reason: any) => TResult2 | PromiseLike<TResult2>): Promise<TResult1 | TResult2> {\n  return PerformPromiseThen(promise, fulfillmentHandler, rejectionHandler);\n}\n\nexport function setPromiseIsHandledToTrue(promise: Promise<unknown>): void {\n  PerformPromiseThen(promise, undefined, rethrowAssertionErrorRejection);\n}\n\nexport const queueMicrotask: (fn: () => void) => void = (() => {\n  const globalQueueMicrotask = globals && globals.queueMicrotask;\n  if (typeof globalQueueMicrotask === 'function') {\n    return globalQueueMicrotask;\n  }\n\n  const resolvedPromise = promiseResolvedWith(undefined);\n  return (fn: () => void) => PerformPromiseThen(resolvedPromise, fn);\n})();\n\nexport function reflectCall<T, A extends any[], R>(F: (this: T, ...fnArgs: A) => R, V: T, args: A): R {\n  if (typeof F !== 'function') {\n    throw new TypeError('Argument is not a function');\n  }\n  return Function.prototype.apply.call(F, V, args);\n}\n\nexport function promiseCall<T, A extends any[], R>(F: (this: T, ...fnArgs: A) => R | PromiseLike<R>,\n                                                   V: T,\n                                                   args: A): Promise<R> {\n  assert(typeof F === 'function');\n  assert(V !== undefined);\n  assert(Array.isArray(args));\n  try {\n    return promiseResolvedWith(reflectCall(F, V, args));\n  } catch (value) {\n    return promiseRejectedWith(value);\n  }\n}\n","import assert from '../stub/assert';\n\n// Original from Chromium\n// https://chromium.googlesource.com/chromium/src/+/0aee4434a4dba42a42abaea9bfbc0cd196a63bc1/third_party/blink/renderer/core/streams/SimpleQueue.js\n\nconst QUEUE_MAX_ARRAY_SIZE = 16384;\n\ninterface Node<T> {\n  _elements: T[];\n  _next: Node<T> | undefined;\n}\n\n/**\n * Simple queue structure.\n *\n * Avoids scalability issues with using a packed array directly by using\n * multiple arrays in a linked list and keeping the array size bounded.\n */\nexport class SimpleQueue<T> {\n  private _front: Node<T>;\n  private _back: Node<T>;\n  private _cursor = 0;\n  private _size = 0;\n\n  constructor() {\n    // _front and _back are always defined.\n    this._front = {\n      _elements: [],\n      _next: undefined\n    };\n    this._back = this._front;\n    // The cursor is used to avoid calling Array.shift().\n    // It contains the index of the front element of the array inside the\n    // front-most node. It is always in the range [0, QUEUE_MAX_ARRAY_SIZE).\n    this._cursor = 0;\n    // When there is only one node, size === elements.length - cursor.\n    this._size = 0;\n  }\n\n  get length(): number {\n    return this._size;\n  }\n\n  // For exception safety, this method is structured in order:\n  // 1. Read state\n  // 2. Calculate required state mutations\n  // 3. Perform state mutations\n  push(element: T): void {\n    const oldBack = this._back;\n    let newBack = oldBack;\n    assert(oldBack._next === undefined);\n    if (oldBack._elements.length === QUEUE_MAX_ARRAY_SIZE - 1) {\n      newBack = {\n        _elements: [],\n        _next: undefined\n      };\n    }\n\n    // push() is the mutation most likely to throw an exception, so it\n    // goes first.\n    oldBack._elements.push(element);\n    if (newBack !== oldBack) {\n      this._back = newBack;\n      oldBack._next = newBack;\n    }\n    ++this._size;\n  }\n\n  // Like push(), shift() follows the read -> calculate -> mutate pattern for\n  // exception safety.\n  shift(): T {\n    assert(this._size > 0); // must not be called on an empty queue\n\n    const oldFront = this._front;\n    let newFront = oldFront;\n    const oldCursor = this._cursor;\n    let newCursor = oldCursor + 1;\n\n    const elements = oldFront._elements;\n    const element = elements[oldCursor];\n\n    if (newCursor === QUEUE_MAX_ARRAY_SIZE) {\n      assert(elements.length === QUEUE_MAX_ARRAY_SIZE);\n      assert(oldFront._next !== undefined);\n      newFront = oldFront._next!;\n      newCursor = 0;\n    }\n\n    // No mutations before this point.\n    --this._size;\n    this._cursor = newCursor;\n    if (oldFront !== newFront) {\n      this._front = newFront;\n    }\n\n    // Permit shifted element to be garbage collected.\n    elements[oldCursor] = undefined!;\n\n    return element;\n  }\n\n  // The tricky thing about forEach() is that it can be called\n  // re-entrantly. The queue may be mutated inside the callback. It is easy to\n  // see that push() within the callback has no negative effects since the end\n  // of the queue is checked for on every iteration. If shift() is called\n  // repeatedly within the callback then the next iteration may return an\n  // element that has been removed. In this case the callback will be called\n  // with undefined values until we either \"catch up\" with elements that still\n  // exist or reach the back of the queue.\n  forEach(callback: (element: T) => void): void {\n    let i = this._cursor;\n    let node = this._front;\n    let elements = node._elements;\n    while (i !== elements.length || node._next !== undefined) {\n      if (i === elements.length) {\n        assert(node._next !== undefined);\n        assert(i === QUEUE_MAX_ARRAY_SIZE);\n        node = node._next!;\n        elements = node._elements;\n        i = 0;\n        if (elements.length === 0) {\n          break;\n        }\n      }\n      callback(elements[i]);\n      ++i;\n    }\n  }\n\n  // Return the element that would be returned if shift() was called now,\n  // without modifying the queue.\n  peek(): T {\n    assert(this._size > 0); // must not be called on an empty queue\n\n    const front = this._front;\n    const cursor = this._cursor;\n    return front._elements[cursor];\n  }\n}\n","import assert from '../../stub/assert';\nimport { ReadableStream, ReadableStreamCancel, ReadableStreamReader } from '../readable-stream';\nimport { newPromise, setPromiseIsHandledToTrue } from '../helpers/webidl';\n\nexport function ReadableStreamReaderGenericInitialize<R>(reader: ReadableStreamReader<R>, stream: ReadableStream<R>) {\n  reader._ownerReadableStream = stream;\n  stream._reader = reader;\n\n  if (stream._state === 'readable') {\n    defaultReaderClosedPromiseInitialize(reader);\n  } else if (stream._state === 'closed') {\n    defaultReaderClosedPromiseInitializeAsResolved(reader);\n  } else {\n    assert(stream._state === 'errored');\n\n    defaultReaderClosedPromiseInitializeAsRejected(reader, stream._storedError);\n  }\n}\n\n// A client of ReadableStreamDefaultReader and ReadableStreamBYOBReader may use these functions directly to bypass state\n// check.\n\nexport function ReadableStreamReaderGenericCancel(reader: ReadableStreamReader<any>, reason: any): Promise<undefined> {\n  const stream = reader._ownerReadableStream;\n  assert(stream !== undefined);\n  return ReadableStreamCancel(stream, reason);\n}\n\nexport function ReadableStreamReaderGenericRelease(reader: ReadableStreamReader<any>) {\n  assert(reader._ownerReadableStream !== undefined);\n  assert(reader._ownerReadableStream._reader === reader);\n\n  if (reader._ownerReadableStream._state === 'readable') {\n    defaultReaderClosedPromiseReject(\n      reader,\n      new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));\n  } else {\n    defaultReaderClosedPromiseResetToRejected(\n      reader,\n      new TypeError(`Reader was released and can no longer be used to monitor the stream's closedness`));\n  }\n\n  reader._ownerReadableStream._reader = undefined;\n  reader._ownerReadableStream = undefined!;\n}\n\n// Helper functions for the readers.\n\nexport function readerLockException(name: string): TypeError {\n  return new TypeError('Cannot ' + name + ' a stream using a released reader');\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nexport function defaultReaderClosedPromiseInitialize(reader: ReadableStreamReader<any>) {\n  reader._closedPromise = newPromise((resolve, reject) => {\n    reader._closedPromise_resolve = resolve;\n    reader._closedPromise_reject = reject;\n  });\n}\n\nexport function defaultReaderClosedPromiseInitializeAsRejected(reader: ReadableStreamReader<any>, reason: any) {\n  defaultReaderClosedPromiseInitialize(reader);\n  defaultReaderClosedPromiseReject(reader, reason);\n}\n\nexport function defaultReaderClosedPromiseInitializeAsResolved(reader: ReadableStreamReader<any>) {\n  defaultReaderClosedPromiseInitialize(reader);\n  defaultReaderClosedPromiseResolve(reader);\n}\n\nexport function defaultReaderClosedPromiseReject(reader: ReadableStreamReader<any>, reason: any) {\n  if (reader._closedPromise_reject === undefined) {\n    return;\n  }\n\n  setPromiseIsHandledToTrue(reader._closedPromise);\n  reader._closedPromise_reject(reason);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n\nexport function defaultReaderClosedPromiseResetToRejected(reader: ReadableStreamReader<any>, reason: any) {\n  assert(reader._closedPromise_resolve === undefined);\n  assert(reader._closedPromise_reject === undefined);\n\n  defaultReaderClosedPromiseInitializeAsRejected(reader, reason);\n}\n\nexport function defaultReaderClosedPromiseResolve(reader: ReadableStreamReader<any>) {\n  if (reader._closedPromise_resolve === undefined) {\n    return;\n  }\n\n  reader._closedPromise_resolve(undefined);\n  reader._closedPromise_resolve = undefined;\n  reader._closedPromise_reject = undefined;\n}\n","export const AbortSteps = Symbol('[[AbortSteps]]');\nexport const ErrorSteps = Symbol('[[ErrorSteps]]');\nexport const CancelSteps = Symbol('[[CancelSteps]]');\nexport const PullSteps = Symbol('[[PullSteps]]');\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite#Polyfill\nconst NumberIsFinite: typeof Number.isFinite = Number.isFinite || function (x) {\n  return typeof x === 'number' && isFinite(x);\n};\n\nexport default NumberIsFinite;\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc#Polyfill\nconst MathTrunc: typeof Math.trunc = Math.trunc || function (v) {\n  return v < 0 ? Math.ceil(v) : Math.floor(v);\n};\n\nexport default MathTrunc;\n","import NumberIsFinite from '../../stub/number-isfinite';\nimport MathTrunc from '../../stub/math-trunc';\n\n// https://heycam.github.io/webidl/#idl-dictionaries\nexport function isDictionary(x: any): x is object | null {\n  return typeof x === 'object' || typeof x === 'function';\n}\n\nexport function assertDictionary(obj: unknown,\n                                 context: string): asserts obj is object | null | undefined {\n  if (obj !== undefined && !isDictionary(obj)) {\n    throw new TypeError(`${context} is not an object.`);\n  }\n}\n\nexport type AnyFunction = (...args: any[]) => any;\n\n// https://heycam.github.io/webidl/#idl-callback-functions\nexport function assertFunction(x: unknown, context: string): asserts x is AnyFunction {\n  if (typeof x !== 'function') {\n    throw new TypeError(`${context} is not a function.`);\n  }\n}\n\n// https://heycam.github.io/webidl/#idl-object\nexport function isObject(x: any): x is object {\n  return (typeof x === 'object' && x !== null) || typeof x === 'function';\n}\n\nexport function assertObject(x: unknown,\n                             context: string): asserts x is object {\n  if (!isObject(x)) {\n    throw new TypeError(`${context} is not an object.`);\n  }\n}\n\nexport function assertRequiredArgument<T extends any>(x: T | undefined,\n                                                      position: number,\n                                                      context: string): asserts x is T {\n  if (x === undefined) {\n    throw new TypeError(`Parameter ${position} is required in '${context}'.`);\n  }\n}\n\nexport function assertRequiredField<T extends any>(x: T | undefined,\n                                                   field: string,\n                                                   context: string): asserts x is T {\n  if (x === undefined) {\n    throw new TypeError(`${field} is required in '${context}'.`);\n  }\n}\n\n// https://heycam.github.io/webidl/#idl-unrestricted-double\nexport function convertUnrestrictedDouble(value: unknown): number {\n  return Number(value);\n}\n\nfunction censorNegativeZero(x: number): number {\n  return x === 0 ? 0 : x;\n}\n\nfunction integerPart(x: number): number {\n  return censorNegativeZero(MathTrunc(x));\n}\n\n// https://heycam.github.io/webidl/#idl-unsigned-long-long\nexport function convertUnsignedLongLongWithEnforceRange(value: unknown, context: string): number {\n  const lowerBound = 0;\n  const upperBound = Number.MAX_SAFE_INTEGER;\n\n  let x = Number(value);\n  x = censorNegativeZero(x);\n\n  if (!NumberIsFinite(x)) {\n    throw new TypeError(`${context} is not a finite number`);\n  }\n\n  x = integerPart(x);\n\n  if (x < lowerBound || x > upperBound) {\n    throw new TypeError(`${context} is outside the accepted range of ${lowerBound} to ${upperBound}, inclusive`);\n  }\n\n  if (!NumberIsFinite(x) || x === 0) {\n    return 0;\n  }\n\n  // TODO Use BigInt if supported?\n  // let xBigInt = BigInt(integerPart(x));\n  // xBigInt = BigInt.asUintN(64, xBigInt);\n  // return Number(xBigInt);\n\n  return x;\n}\n","import { IsReadableStream, ReadableStream } from '../readable-stream';\n\nexport function assertReadableStream(x: unknown, context: string): asserts x is ReadableStream {\n  if (!IsReadableStream(x)) {\n    throw new TypeError(`${context} is not a ReadableStream.`);\n  }\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericInitialize,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport { IsReadableStreamLocked, ReadableStream } from '../readable-stream';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { PullSteps } from '../abstract-ops/internal-methods';\nimport { newPromise, promiseRejectedWith } from '../helpers/webidl';\nimport { assertRequiredArgument } from '../validators/basic';\nimport { assertReadableStream } from '../validators/readable-stream';\n\n/**\n * A result returned by {@link ReadableStreamDefaultReader.read}.\n *\n * @public\n */\nexport type ReadableStreamDefaultReadResult<T> = {\n  done: false;\n  value: T;\n} | {\n  done: true;\n  value?: undefined;\n}\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamDefaultReader<R>(stream: ReadableStream): ReadableStreamDefaultReader<R> {\n  return new ReadableStreamDefaultReader(stream);\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamAddReadRequest<R>(stream: ReadableStream<R>,\n                                                readRequest: ReadRequest<R>): void {\n  assert(IsReadableStreamDefaultReader(stream._reader));\n  assert(stream._state === 'readable');\n\n  (stream._reader! as ReadableStreamDefaultReader<R>)._readRequests.push(readRequest);\n}\n\nexport function ReadableStreamFulfillReadRequest<R>(stream: ReadableStream<R>, chunk: R | undefined, done: boolean) {\n  const reader = stream._reader as ReadableStreamDefaultReader<R>;\n\n  assert(reader._readRequests.length > 0);\n\n  const readRequest = reader._readRequests.shift()!;\n  if (done) {\n    readRequest._closeSteps();\n  } else {\n    readRequest._chunkSteps(chunk!);\n  }\n}\n\nexport function ReadableStreamGetNumReadRequests<R>(stream: ReadableStream<R>): number {\n  return (stream._reader as ReadableStreamDefaultReader<R>)._readRequests.length;\n}\n\nexport function ReadableStreamHasDefaultReader(stream: ReadableStream): boolean {\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return false;\n  }\n\n  if (!IsReadableStreamDefaultReader(reader)) {\n    return false;\n  }\n\n  return true;\n}\n\n// Readers\n\nexport interface ReadRequest<R> {\n  _chunkSteps(chunk: R): void;\n\n  _closeSteps(): void;\n\n  _errorSteps(e: any): void;\n}\n\n/**\n * A default reader vended by a {@link ReadableStream}.\n *\n * @public\n */\nexport class ReadableStreamDefaultReader<R = any> {\n  /** @internal */\n  _ownerReadableStream!: ReadableStream<R>;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readRequests: SimpleQueue<ReadRequest<R>>;\n\n  constructor(stream: ReadableStream<R>) {\n    assertRequiredArgument(stream, 1, 'ReadableStreamDefaultReader');\n    assertReadableStream(stream, 'First parameter');\n\n    if (IsReadableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n    }\n\n    ReadableStreamReaderGenericInitialize(this, stream);\n\n    this._readRequests = new SimpleQueue();\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed,\n   * or rejected if the stream ever errors or the reader's lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('cancel'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('cancel'));\n    }\n\n    return ReadableStreamReaderGenericCancel(this, reason);\n  }\n\n  /**\n   * Returns a promise that allows access to the next chunk from the stream's internal queue, if available.\n   *\n   * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.\n   */\n  read(): Promise<ReadableStreamDefaultReadResult<R>> {\n    if (!IsReadableStreamDefaultReader(this)) {\n      return promiseRejectedWith(defaultReaderBrandCheckException('read'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('read from'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamDefaultReadResult<R>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamDefaultReadResult<R>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),\n      _closeSteps: () => resolvePromise({ value: undefined, done: true }),\n      _errorSteps: e => rejectPromise(e)\n    };\n    ReadableStreamDefaultReaderRead(this, readRequest);\n    return promise;\n  }\n\n  /**\n   * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.\n   * If the associated stream is errored when the lock is released, the reader will appear errored in the same way\n   * from now on; otherwise, the reader will appear closed.\n   *\n   * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by\n   * the reader's {@link ReadableStreamDefaultReader.read | read()} method has not yet been settled. Attempting to\n   * do so will throw a `TypeError` and leave the reader locked to the stream.\n   */\n  releaseLock(): void {\n    if (!IsReadableStreamDefaultReader(this)) {\n      throw defaultReaderBrandCheckException('releaseLock');\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return;\n    }\n\n    if (this._readRequests.length > 0) {\n      throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n    }\n\n    ReadableStreamReaderGenericRelease(this);\n  }\n}\n\nObject.defineProperties(ReadableStreamDefaultReader.prototype, {\n  cancel: { enumerable: true },\n  read: { enumerable: true },\n  releaseLock: { enumerable: true },\n  closed: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamDefaultReader.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamDefaultReader',\n    configurable: true\n  });\n}\n\n// Abstract operations for the readers.\n\nexport function IsReadableStreamDefaultReader<R = any>(x: any): x is ReadableStreamDefaultReader<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readRequests')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamDefaultReader;\n}\n\nexport function ReadableStreamDefaultReaderRead<R>(reader: ReadableStreamDefaultReader<R>,\n                                                   readRequest: ReadRequest<R>): void {\n  const stream = reader._ownerReadableStream;\n\n  assert(stream !== undefined);\n\n  stream._disturbed = true;\n\n  if (stream._state === 'closed') {\n    readRequest._closeSteps();\n  } else if (stream._state === 'errored') {\n    readRequest._errorSteps(stream._storedError);\n  } else {\n    assert(stream._state === 'readable');\n    stream._readableStreamController[PullSteps](readRequest as ReadRequest<any>);\n  }\n}\n\n// Helper functions for the ReadableStreamDefaultReader.\n\nfunction defaultReaderBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamDefaultReader.prototype.${name} can only be used on a ReadableStreamDefaultReader`);\n}\n","/// <reference lib=\"es2018.asynciterable\" />\n\nexport let AsyncIteratorPrototype: AsyncIterable<any> | undefined;\n\nif (typeof Symbol.asyncIterator === 'symbol') {\n  // We're running inside a ES2018+ environment, but we're compiling to an older syntax.\n  // We cannot access %AsyncIteratorPrototype% without non-ES2018 syntax, but we can re-create it.\n  AsyncIteratorPrototype = {\n    // 25.1.3.1 %AsyncIteratorPrototype% [ @@asyncIterator ] ( )\n    // https://tc39.github.io/ecma262/#sec-asynciteratorprototype-asynciterator\n    [Symbol.asyncIterator](this: AsyncIterator<any>) {\n      return this;\n    }\n  };\n  Object.defineProperty(AsyncIteratorPrototype, Symbol.asyncIterator, { enumerable: false });\n}\n","/// <reference lib=\"es2018.asynciterable\" />\n\nimport { ReadableStream } from '../readable-stream';\nimport {\n  AcquireReadableStreamDefaultReader,\n  ReadableStreamDefaultReader,\n  ReadableStreamDefaultReaderRead,\n  ReadableStreamDefaultReadResult,\n  ReadRequest\n} from './default-reader';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport assert from '../../stub/assert';\nimport { AsyncIteratorPrototype } from '@@target/stub/async-iterator-prototype';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport {\n  newPromise,\n  promiseRejectedWith,\n  promiseResolvedWith,\n  queueMicrotask,\n  transformPromiseWith\n} from '../helpers/webidl';\n\n/**\n * An async iterator returned by {@link ReadableStream.values}.\n *\n * @public\n */\nexport interface ReadableStreamAsyncIterator<R> extends AsyncIterator<R> {\n  next(): Promise<IteratorResult<R, undefined>>;\n\n  return(value?: any): Promise<IteratorResult<any>>;\n}\n\nexport class ReadableStreamAsyncIteratorImpl<R> {\n  private readonly _reader: ReadableStreamDefaultReader<R>;\n  private readonly _preventCancel: boolean;\n  private _ongoingPromise: Promise<ReadableStreamDefaultReadResult<R>> | undefined = undefined;\n  private _isFinished = false;\n\n  constructor(reader: ReadableStreamDefaultReader<R>, preventCancel: boolean) {\n    this._reader = reader;\n    this._preventCancel = preventCancel;\n  }\n\n  next(): Promise<ReadableStreamDefaultReadResult<R>> {\n    const nextSteps = () => this._nextSteps();\n    this._ongoingPromise = this._ongoingPromise ?\n      transformPromiseWith(this._ongoingPromise, nextSteps, nextSteps) :\n      nextSteps();\n    return this._ongoingPromise;\n  }\n\n  return(value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    const returnSteps = () => this._returnSteps(value);\n    return this._ongoingPromise ?\n      transformPromiseWith(this._ongoingPromise, returnSteps, returnSteps) :\n      returnSteps();\n  }\n\n  private _nextSteps(): Promise<ReadableStreamDefaultReadResult<R>> {\n    if (this._isFinished) {\n      return Promise.resolve({ value: undefined, done: true });\n    }\n\n    const reader = this._reader;\n    if (reader._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('iterate'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamDefaultReadResult<R>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamDefaultReadResult<R>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => {\n        this._ongoingPromise = undefined;\n        // This needs to be delayed by one microtask, otherwise we stop pulling too early which breaks a test.\n        // FIXME Is this a bug in the specification, or in the test?\n        queueMicrotask(() => resolvePromise({ value: chunk, done: false }));\n      },\n      _closeSteps: () => {\n        this._ongoingPromise = undefined;\n        this._isFinished = true;\n        ReadableStreamReaderGenericRelease(reader);\n        resolvePromise({ value: undefined, done: true });\n      },\n      _errorSteps: reason => {\n        this._ongoingPromise = undefined;\n        this._isFinished = true;\n        ReadableStreamReaderGenericRelease(reader);\n        rejectPromise(reason);\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n    return promise;\n  }\n\n  private _returnSteps(value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (this._isFinished) {\n      return Promise.resolve({ value, done: true });\n    }\n    this._isFinished = true;\n\n    const reader = this._reader;\n    if (reader._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('finish iterating'));\n    }\n\n    assert(reader._readRequests.length === 0);\n\n    if (!this._preventCancel) {\n      const result = ReadableStreamReaderGenericCancel(reader, value);\n      ReadableStreamReaderGenericRelease(reader);\n      return transformPromiseWith(result, () => ({ value, done: true }));\n    }\n\n    ReadableStreamReaderGenericRelease(reader);\n    return promiseResolvedWith({ value, done: true });\n  }\n}\n\ndeclare class ReadableStreamAsyncIteratorInstance<R> implements ReadableStreamAsyncIterator<R> {\n  /** @interal */\n  _asyncIteratorImpl: ReadableStreamAsyncIteratorImpl<R>;\n\n  next(): Promise<IteratorResult<R, undefined>>;\n\n  return(value?: any): Promise<IteratorResult<any>>;\n}\n\nconst ReadableStreamAsyncIteratorPrototype: ReadableStreamAsyncIteratorInstance<any> = {\n  next(this: ReadableStreamAsyncIteratorInstance<any>): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (!IsReadableStreamAsyncIterator(this)) {\n      return promiseRejectedWith(streamAsyncIteratorBrandCheckException('next'));\n    }\n    return this._asyncIteratorImpl.next();\n  },\n\n  return(this: ReadableStreamAsyncIteratorInstance<any>, value: any): Promise<ReadableStreamDefaultReadResult<any>> {\n    if (!IsReadableStreamAsyncIterator(this)) {\n      return promiseRejectedWith(streamAsyncIteratorBrandCheckException('return'));\n    }\n    return this._asyncIteratorImpl.return(value);\n  }\n} as any;\nif (AsyncIteratorPrototype !== undefined) {\n  Object.setPrototypeOf(ReadableStreamAsyncIteratorPrototype, AsyncIteratorPrototype);\n}\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamAsyncIterator<R>(stream: ReadableStream<R>,\n                                                      preventCancel: boolean): ReadableStreamAsyncIterator<R> {\n  const reader = AcquireReadableStreamDefaultReader<R>(stream);\n  const impl = new ReadableStreamAsyncIteratorImpl(reader, preventCancel);\n  const iterator: ReadableStreamAsyncIteratorInstance<R> = Object.create(ReadableStreamAsyncIteratorPrototype);\n  iterator._asyncIteratorImpl = impl;\n  return iterator;\n}\n\nfunction IsReadableStreamAsyncIterator<R = any>(x: any): x is ReadableStreamAsyncIterator<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_asyncIteratorImpl')) {\n    return false;\n  }\n\n  try {\n    // noinspection SuspiciousTypeOfGuard\n    return (x as ReadableStreamAsyncIteratorInstance<any>)._asyncIteratorImpl instanceof\n      ReadableStreamAsyncIteratorImpl;\n  } catch {\n    return false;\n  }\n}\n\n// Helper functions for the ReadableStream.\n\nfunction streamAsyncIteratorBrandCheckException(name: string): TypeError {\n  return new TypeError(`ReadableStreamAsyncIterator.${name} can only be used on a ReadableSteamAsyncIterator`);\n}\n","/// <reference lib=\"es2015.core\" />\n\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Polyfill\nconst NumberIsNaN: typeof Number.isNaN = Number.isNaN || function (x) {\n  // eslint-disable-next-line no-self-compare\n  return x !== x;\n};\n\nexport default NumberIsNaN;\n","export function CreateArrayFromList<T extends any[]>(elements: T): T {\n  // We use arrays to represent lists, so this is basically a no-op.\n  // Do a slice though just in case we happen to depend on the unique-ness.\n  return elements.slice() as T;\n}\n\nexport function CopyDataBlockBytes(dest: ArrayBuffer,\n                                   destOffset: number,\n                                   src: ArrayBuffer,\n                                   srcOffset: number,\n                                   n: number) {\n  new Uint8Array(dest).set(new Uint8Array(src, srcOffset, n), destOffset);\n}\n\n// Not implemented correctly\nexport function TransferArrayBuffer<T extends ArrayBufferLike>(O: T): T {\n  return O;\n}\n\n// Not implemented correctly\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nexport function CanTransferArrayBuffer(O: ArrayBufferLike): boolean {\n  return true;\n}\n\n// Not implemented correctly\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\nexport function IsDetachedBuffer(O: ArrayBufferLike): boolean {\n  return false;\n}\n\nexport function ArrayBufferSlice(buffer: ArrayBufferLike, begin: number, end: number): ArrayBufferLike {\n  // ArrayBuffer.prototype.slice is not available on IE10\n  // https://www.caniuse.com/mdn-javascript_builtins_arraybuffer_slice\n  if (buffer.slice) {\n    return buffer.slice(begin, end);\n  }\n  const length = end - begin;\n  const slice = new ArrayBuffer(length);\n  CopyDataBlockBytes(slice, 0, buffer, begin, length);\n  return slice;\n}\n","import NumberIsNaN from '../../stub/number-isnan';\nimport { ArrayBufferSlice } from './ecmascript';\n\nexport function IsNonNegativeNumber(v: number): boolean {\n  if (typeof v !== 'number') {\n    return false;\n  }\n\n  if (NumberIsNaN(v)) {\n    return false;\n  }\n\n  if (v < 0) {\n    return false;\n  }\n\n  return true;\n}\n\nexport function CloneAsUint8Array(O: ArrayBufferView): Uint8Array {\n  const buffer = ArrayBufferSlice(O.buffer, O.byteOffset, O.byteOffset + O.byteLength);\n  return new Uint8Array(buffer);\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport { IsNonNegativeNumber } from './miscellaneous';\n\nexport interface QueueContainer<T> {\n  _queue: SimpleQueue<T>;\n  _queueTotalSize: number;\n}\n\nexport interface QueuePair<T> {\n  value: T;\n  size: number;\n}\n\nexport function DequeueValue<T>(container: QueueContainer<QueuePair<T>>): T {\n  assert('_queue' in container && '_queueTotalSize' in container);\n  assert(container._queue.length > 0);\n\n  const pair = container._queue.shift()!;\n  container._queueTotalSize -= pair.size;\n  if (container._queueTotalSize < 0) {\n    container._queueTotalSize = 0;\n  }\n\n  return pair.value;\n}\n\nexport function EnqueueValueWithSize<T>(container: QueueContainer<QueuePair<T>>, value: T, size: number) {\n  assert('_queue' in container && '_queueTotalSize' in container);\n\n  if (!IsNonNegativeNumber(size) || size === Infinity) {\n    throw new RangeError('Size must be a finite, non-NaN, non-negative number.');\n  }\n\n  container._queue.push({ value, size });\n  container._queueTotalSize += size;\n}\n\nexport function PeekQueueValue<T>(container: QueueContainer<QueuePair<T>>): T {\n  assert('_queue' in container && '_queueTotalSize' in container);\n  assert(container._queue.length > 0);\n\n  const pair = container._queue.peek();\n  return pair.value;\n}\n\nexport function ResetQueue<T>(container: QueueContainer<T>) {\n  assert('_queue' in container && '_queueTotalSize' in container);\n\n  container._queue = new SimpleQueue<T>();\n  container._queueTotalSize = 0;\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport { ResetQueue } from '../abstract-ops/queue-with-sizes';\nimport {\n  ReadableStreamAddReadRequest,\n  ReadableStreamFulfillReadRequest,\n  ReadableStreamGetNumReadRequests,\n  ReadableStreamHasDefaultReader,\n  ReadRequest\n} from './default-reader';\nimport {\n  ReadableStreamAddReadIntoRequest,\n  ReadableStreamFulfillReadIntoRequest,\n  ReadableStreamGetNumReadIntoRequests,\n  ReadableStreamHasBYOBReader,\n  ReadIntoRequest\n} from './byob-reader';\nimport NumberIsInteger from '../../stub/number-isinteger';\nimport {\n  IsReadableStreamLocked,\n  ReadableByteStream,\n  ReadableStreamClose,\n  ReadableStreamError\n} from '../readable-stream';\nimport { ValidatedUnderlyingByteSource } from './underlying-source';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport {\n  ArrayBufferSlice,\n  CanTransferArrayBuffer,\n  CopyDataBlockBytes,\n  IsDetachedBuffer,\n  TransferArrayBuffer\n} from '../abstract-ops/ecmascript';\nimport { CancelSteps, PullSteps } from '../abstract-ops/internal-methods';\nimport { promiseResolvedWith, uponPromise } from '../helpers/webidl';\nimport { assertRequiredArgument, convertUnsignedLongLongWithEnforceRange } from '../validators/basic';\n\n/**\n * A pull-into request in a {@link ReadableByteStreamController}.\n *\n * @public\n */\nexport class ReadableStreamBYOBRequest {\n  /** @internal */\n  _associatedReadableByteStreamController!: ReadableByteStreamController;\n  /** @internal */\n  _view!: ArrayBufferView | null;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the view for writing in to, or `null` if the BYOB request has already been responded to.\n   */\n  get view(): ArrayBufferView | null {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('view');\n    }\n\n    return this._view;\n  }\n\n  /**\n   * Indicates to the associated readable byte stream that `bytesWritten` bytes were written into\n   * {@link ReadableStreamBYOBRequest.view | view}, causing the result be surfaced to the consumer.\n   *\n   * After this method is called, {@link ReadableStreamBYOBRequest.view | view} will be transferred and no longer\n   * modifiable.\n   */\n  respond(bytesWritten: number): void;\n  respond(bytesWritten: number | undefined): void {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('respond');\n    }\n    assertRequiredArgument(bytesWritten, 1, 'respond');\n    bytesWritten = convertUnsignedLongLongWithEnforceRange(bytesWritten, 'First parameter');\n\n    if (this._associatedReadableByteStreamController === undefined) {\n      throw new TypeError('This BYOB request has been invalidated');\n    }\n\n    if (IsDetachedBuffer(this._view!.buffer)) {\n      throw new TypeError(`The BYOB request's buffer has been detached and so cannot be used as a response`);\n    }\n\n    assert(this._view!.byteLength > 0);\n    assert(this._view!.buffer.byteLength > 0);\n\n    ReadableByteStreamControllerRespond(this._associatedReadableByteStreamController, bytesWritten);\n  }\n\n  /**\n   * Indicates to the associated readable byte stream that instead of writing into\n   * {@link ReadableStreamBYOBRequest.view | view}, the underlying byte source is providing a new `ArrayBufferView`,\n   * which will be given to the consumer of the readable byte stream.\n   *\n   * After this method is called, `view` will be transferred and no longer modifiable.\n   */\n  respondWithNewView(view: ArrayBufferView): void;\n  respondWithNewView(view: ArrayBufferView | undefined): void {\n    if (!IsReadableStreamBYOBRequest(this)) {\n      throw byobRequestBrandCheckException('respondWithNewView');\n    }\n    assertRequiredArgument(view, 1, 'respondWithNewView');\n\n    if (!ArrayBuffer.isView(view)) {\n      throw new TypeError('You can only respond with array buffer views');\n    }\n\n    if (this._associatedReadableByteStreamController === undefined) {\n      throw new TypeError('This BYOB request has been invalidated');\n    }\n\n    if (IsDetachedBuffer(view.buffer)) {\n      throw new TypeError('The given view\\'s buffer has been detached and so cannot be used as a response');\n    }\n\n    ReadableByteStreamControllerRespondWithNewView(this._associatedReadableByteStreamController, view);\n  }\n}\n\nObject.defineProperties(ReadableStreamBYOBRequest.prototype, {\n  respond: { enumerable: true },\n  respondWithNewView: { enumerable: true },\n  view: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamBYOBRequest.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamBYOBRequest',\n    configurable: true\n  });\n}\n\ninterface ArrayBufferViewConstructor<T extends ArrayBufferView = ArrayBufferView> {\n  new(buffer: ArrayBufferLike, byteOffset: number, length?: number): T;\n\n  readonly prototype: T;\n  readonly BYTES_PER_ELEMENT: number;\n}\n\ninterface ByteQueueElement {\n  buffer: ArrayBufferLike;\n  byteOffset: number;\n  byteLength: number;\n}\n\ntype PullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> =\n  DefaultPullIntoDescriptor\n  | BYOBPullIntoDescriptor<T>;\n\ninterface DefaultPullIntoDescriptor {\n  buffer: ArrayBufferLike;\n  bufferByteLength: number;\n  byteOffset: number;\n  byteLength: number;\n  bytesFilled: number;\n  elementSize: number;\n  viewConstructor: ArrayBufferViewConstructor<Uint8Array>;\n  readerType: 'default';\n}\n\ninterface BYOBPullIntoDescriptor<T extends ArrayBufferView = ArrayBufferView> {\n  buffer: ArrayBufferLike;\n  bufferByteLength: number;\n  byteOffset: number;\n  byteLength: number;\n  bytesFilled: number;\n  elementSize: number;\n  viewConstructor: ArrayBufferViewConstructor<T>;\n  readerType: 'byob';\n}\n\n/**\n * Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue.\n *\n * @public\n */\nexport class ReadableByteStreamController {\n  /** @internal */\n  _controlledReadableByteStream!: ReadableByteStream;\n  /** @internal */\n  _queue!: SimpleQueue<ByteQueueElement>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _closeRequested!: boolean;\n  /** @internal */\n  _pullAgain!: boolean;\n  /** @internal */\n  _pulling !: boolean;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _pullAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _cancelAlgorithm!: (reason: any) => Promise<void>;\n  /** @internal */\n  _autoAllocateChunkSize: number | undefined;\n  /** @internal */\n  _byobRequest: ReadableStreamBYOBRequest | null;\n  /** @internal */\n  _pendingPullIntos!: SimpleQueue<PullIntoDescriptor>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the current BYOB pull request, or `null` if there isn't one.\n   */\n  get byobRequest(): ReadableStreamBYOBRequest | null {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('byobRequest');\n    }\n\n    return ReadableByteStreamControllerGetBYOBRequest(this);\n  }\n\n  /**\n   * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is\n   * over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure.\n   */\n  get desiredSize(): number | null {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('desiredSize');\n    }\n\n    return ReadableByteStreamControllerGetDesiredSize(this);\n  }\n\n  /**\n   * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from\n   * the stream, but once those are read, the stream will become closed.\n   */\n  close(): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('close');\n    }\n\n    if (this._closeRequested) {\n      throw new TypeError('The stream has already been closed; do not close it again!');\n    }\n\n    const state = this._controlledReadableByteStream._state;\n    if (state !== 'readable') {\n      throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be closed`);\n    }\n\n    ReadableByteStreamControllerClose(this);\n  }\n\n  /**\n   * Enqueues the given chunk chunk in the controlled readable stream.\n   * The chunk has to be an `ArrayBufferView` instance, or else a `TypeError` will be thrown.\n   */\n  enqueue(chunk: ArrayBufferView): void;\n  enqueue(chunk: ArrayBufferView | undefined): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('enqueue');\n    }\n\n    assertRequiredArgument(chunk, 1, 'enqueue');\n    if (!ArrayBuffer.isView(chunk)) {\n      throw new TypeError('chunk must be an array buffer view');\n    }\n    if (chunk.byteLength === 0) {\n      throw new TypeError('chunk must have non-zero byteLength');\n    }\n    if (chunk.buffer.byteLength === 0) {\n      throw new TypeError(`chunk's buffer must have non-zero byteLength`);\n    }\n\n    if (this._closeRequested) {\n      throw new TypeError('stream is closed or draining');\n    }\n\n    const state = this._controlledReadableByteStream._state;\n    if (state !== 'readable') {\n      throw new TypeError(`The stream (in ${state} state) is not in the readable state and cannot be enqueued to`);\n    }\n\n    ReadableByteStreamControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.\n   */\n  error(e: any = undefined): void {\n    if (!IsReadableByteStreamController(this)) {\n      throw byteStreamControllerBrandCheckException('error');\n    }\n\n    ReadableByteStreamControllerError(this, e);\n  }\n\n  /** @internal */\n  [CancelSteps](reason: any): Promise<void> {\n    ReadableByteStreamControllerClearPendingPullIntos(this);\n\n    ResetQueue(this);\n\n    const result = this._cancelAlgorithm(reason);\n    ReadableByteStreamControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [PullSteps](readRequest: ReadRequest<Uint8Array>): void {\n    const stream = this._controlledReadableByteStream;\n    assert(ReadableStreamHasDefaultReader(stream));\n\n    if (this._queueTotalSize > 0) {\n      assert(ReadableStreamGetNumReadRequests(stream) === 0);\n\n      const entry = this._queue.shift()!;\n      this._queueTotalSize -= entry.byteLength;\n\n      ReadableByteStreamControllerHandleQueueDrain(this);\n\n      const view = new Uint8Array(entry.buffer, entry.byteOffset, entry.byteLength);\n\n      readRequest._chunkSteps(view);\n      return;\n    }\n\n    const autoAllocateChunkSize = this._autoAllocateChunkSize;\n    if (autoAllocateChunkSize !== undefined) {\n      let buffer: ArrayBuffer;\n      try {\n        buffer = new ArrayBuffer(autoAllocateChunkSize);\n      } catch (bufferE) {\n        readRequest._errorSteps(bufferE);\n        return;\n      }\n\n      const pullIntoDescriptor: DefaultPullIntoDescriptor = {\n        buffer,\n        bufferByteLength: autoAllocateChunkSize,\n        byteOffset: 0,\n        byteLength: autoAllocateChunkSize,\n        bytesFilled: 0,\n        elementSize: 1,\n        viewConstructor: Uint8Array,\n        readerType: 'default'\n      };\n\n      this._pendingPullIntos.push(pullIntoDescriptor);\n    }\n\n    ReadableStreamAddReadRequest(stream, readRequest);\n    ReadableByteStreamControllerCallPullIfNeeded(this);\n  }\n}\n\nObject.defineProperties(ReadableByteStreamController.prototype, {\n  close: { enumerable: true },\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  byobRequest: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableByteStreamController.prototype, Symbol.toStringTag, {\n    value: 'ReadableByteStreamController',\n    configurable: true\n  });\n}\n\n// Abstract operations for the ReadableByteStreamController.\n\nexport function IsReadableByteStreamController(x: any): x is ReadableByteStreamController {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableByteStream')) {\n    return false;\n  }\n\n  return x instanceof ReadableByteStreamController;\n}\n\nfunction IsReadableStreamBYOBRequest(x: any): x is ReadableStreamBYOBRequest {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_associatedReadableByteStreamController')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamBYOBRequest;\n}\n\nfunction ReadableByteStreamControllerCallPullIfNeeded(controller: ReadableByteStreamController): void {\n  const shouldPull = ReadableByteStreamControllerShouldCallPull(controller);\n  if (!shouldPull) {\n    return;\n  }\n\n  if (controller._pulling) {\n    controller._pullAgain = true;\n    return;\n  }\n\n  assert(!controller._pullAgain);\n\n  controller._pulling = true;\n\n  // TODO: Test controller argument\n  const pullPromise = controller._pullAlgorithm();\n  uponPromise(\n    pullPromise,\n    () => {\n      controller._pulling = false;\n\n      if (controller._pullAgain) {\n        controller._pullAgain = false;\n        ReadableByteStreamControllerCallPullIfNeeded(controller);\n      }\n    },\n    e => {\n      ReadableByteStreamControllerError(controller, e);\n    }\n  );\n}\n\nfunction ReadableByteStreamControllerClearPendingPullIntos(controller: ReadableByteStreamController) {\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n  controller._pendingPullIntos = new SimpleQueue();\n}\n\nfunction ReadableByteStreamControllerCommitPullIntoDescriptor<T extends ArrayBufferView>(\n  stream: ReadableByteStream,\n  pullIntoDescriptor: PullIntoDescriptor<T>\n) {\n  assert(stream._state !== 'errored');\n\n  let done = false;\n  if (stream._state === 'closed') {\n    assert(pullIntoDescriptor.bytesFilled === 0);\n    done = true;\n  }\n\n  const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);\n  if (pullIntoDescriptor.readerType === 'default') {\n    ReadableStreamFulfillReadRequest(stream, filledView as unknown as Uint8Array, done);\n  } else {\n    assert(pullIntoDescriptor.readerType === 'byob');\n    ReadableStreamFulfillReadIntoRequest(stream, filledView, done);\n  }\n}\n\nfunction ReadableByteStreamControllerConvertPullIntoDescriptor<T extends ArrayBufferView>(\n  pullIntoDescriptor: PullIntoDescriptor<T>\n): T {\n  const bytesFilled = pullIntoDescriptor.bytesFilled;\n  const elementSize = pullIntoDescriptor.elementSize;\n\n  assert(bytesFilled <= pullIntoDescriptor.byteLength);\n  assert(bytesFilled % elementSize === 0);\n\n  return new pullIntoDescriptor.viewConstructor(\n    pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, bytesFilled / elementSize) as T;\n}\n\nfunction ReadableByteStreamControllerEnqueueChunkToQueue(controller: ReadableByteStreamController,\n                                                         buffer: ArrayBufferLike,\n                                                         byteOffset: number,\n                                                         byteLength: number) {\n  controller._queue.push({ buffer, byteOffset, byteLength });\n  controller._queueTotalSize += byteLength;\n}\n\nfunction ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller: ReadableByteStreamController,\n                                                                     pullIntoDescriptor: PullIntoDescriptor) {\n  const elementSize = pullIntoDescriptor.elementSize;\n\n  const currentAlignedBytes = pullIntoDescriptor.bytesFilled - pullIntoDescriptor.bytesFilled % elementSize;\n\n  const maxBytesToCopy = Math.min(controller._queueTotalSize,\n                                  pullIntoDescriptor.byteLength - pullIntoDescriptor.bytesFilled);\n  const maxBytesFilled = pullIntoDescriptor.bytesFilled + maxBytesToCopy;\n  const maxAlignedBytes = maxBytesFilled - maxBytesFilled % elementSize;\n\n  let totalBytesToCopyRemaining = maxBytesToCopy;\n  let ready = false;\n  if (maxAlignedBytes > currentAlignedBytes) {\n    totalBytesToCopyRemaining = maxAlignedBytes - pullIntoDescriptor.bytesFilled;\n    ready = true;\n  }\n\n  const queue = controller._queue;\n\n  while (totalBytesToCopyRemaining > 0) {\n    const headOfQueue = queue.peek();\n\n    const bytesToCopy = Math.min(totalBytesToCopyRemaining, headOfQueue.byteLength);\n\n    const destStart = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n    CopyDataBlockBytes(pullIntoDescriptor.buffer, destStart, headOfQueue.buffer, headOfQueue.byteOffset, bytesToCopy);\n\n    if (headOfQueue.byteLength === bytesToCopy) {\n      queue.shift();\n    } else {\n      headOfQueue.byteOffset += bytesToCopy;\n      headOfQueue.byteLength -= bytesToCopy;\n    }\n    controller._queueTotalSize -= bytesToCopy;\n\n    ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesToCopy, pullIntoDescriptor);\n\n    totalBytesToCopyRemaining -= bytesToCopy;\n  }\n\n  if (!ready) {\n    assert(controller._queueTotalSize === 0);\n    assert(pullIntoDescriptor.bytesFilled > 0);\n    assert(pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize);\n  }\n\n  return ready;\n}\n\nfunction ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller: ReadableByteStreamController,\n                                                                size: number,\n                                                                pullIntoDescriptor: PullIntoDescriptor) {\n  assert(controller._pendingPullIntos.length === 0 || controller._pendingPullIntos.peek() === pullIntoDescriptor);\n  assert(controller._byobRequest === null);\n  pullIntoDescriptor.bytesFilled += size;\n}\n\nfunction ReadableByteStreamControllerHandleQueueDrain(controller: ReadableByteStreamController) {\n  assert(controller._controlledReadableByteStream._state === 'readable');\n\n  if (controller._queueTotalSize === 0 && controller._closeRequested) {\n    ReadableByteStreamControllerClearAlgorithms(controller);\n    ReadableStreamClose(controller._controlledReadableByteStream);\n  } else {\n    ReadableByteStreamControllerCallPullIfNeeded(controller);\n  }\n}\n\nfunction ReadableByteStreamControllerInvalidateBYOBRequest(controller: ReadableByteStreamController) {\n  if (controller._byobRequest === null) {\n    return;\n  }\n\n  controller._byobRequest._associatedReadableByteStreamController = undefined!;\n  controller._byobRequest._view = null!;\n  controller._byobRequest = null;\n}\n\nfunction ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller: ReadableByteStreamController) {\n  assert(!controller._closeRequested);\n\n  while (controller._pendingPullIntos.length > 0) {\n    if (controller._queueTotalSize === 0) {\n      return;\n    }\n\n    const pullIntoDescriptor = controller._pendingPullIntos.peek();\n\n    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {\n      ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n      ReadableByteStreamControllerCommitPullIntoDescriptor(\n        controller._controlledReadableByteStream,\n        pullIntoDescriptor\n      );\n    }\n  }\n}\n\nexport function ReadableByteStreamControllerPullInto<T extends ArrayBufferView>(\n  controller: ReadableByteStreamController,\n  view: T,\n  readIntoRequest: ReadIntoRequest<T>\n): void {\n  const stream = controller._controlledReadableByteStream;\n\n  let elementSize = 1;\n  if (view.constructor !== DataView) {\n    elementSize = (view.constructor as ArrayBufferViewConstructor<T>).BYTES_PER_ELEMENT;\n  }\n\n  const ctor = view.constructor as ArrayBufferViewConstructor<T>;\n\n  // try {\n  const buffer = TransferArrayBuffer(view.buffer);\n  // } catch (e) {\n  //   readIntoRequest._errorSteps(e);\n  //   return;\n  // }\n\n  const pullIntoDescriptor: BYOBPullIntoDescriptor<T> = {\n    buffer,\n    bufferByteLength: buffer.byteLength,\n    byteOffset: view.byteOffset,\n    byteLength: view.byteLength,\n    bytesFilled: 0,\n    elementSize,\n    viewConstructor: ctor,\n    readerType: 'byob'\n  };\n\n  if (controller._pendingPullIntos.length > 0) {\n    controller._pendingPullIntos.push(pullIntoDescriptor);\n\n    // No ReadableByteStreamControllerCallPullIfNeeded() call since:\n    // - No change happens on desiredSize\n    // - The source has already been notified of that there's at least 1 pending read(view)\n\n    ReadableStreamAddReadIntoRequest(stream, readIntoRequest);\n    return;\n  }\n\n  if (stream._state === 'closed') {\n    const emptyView = new ctor(pullIntoDescriptor.buffer, pullIntoDescriptor.byteOffset, 0);\n    readIntoRequest._closeSteps(emptyView);\n    return;\n  }\n\n  if (controller._queueTotalSize > 0) {\n    if (ReadableByteStreamControllerFillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor)) {\n      const filledView = ReadableByteStreamControllerConvertPullIntoDescriptor<T>(pullIntoDescriptor);\n\n      ReadableByteStreamControllerHandleQueueDrain(controller);\n\n      readIntoRequest._chunkSteps(filledView);\n      return;\n    }\n\n    if (controller._closeRequested) {\n      const e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n      ReadableByteStreamControllerError(controller, e);\n\n      readIntoRequest._errorSteps(e);\n      return;\n    }\n  }\n\n  controller._pendingPullIntos.push(pullIntoDescriptor);\n\n  ReadableStreamAddReadIntoRequest<T>(stream, readIntoRequest);\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nfunction ReadableByteStreamControllerRespondInClosedState(controller: ReadableByteStreamController,\n                                                          firstDescriptor: PullIntoDescriptor) {\n  assert(firstDescriptor.bytesFilled === 0);\n\n  const stream = controller._controlledReadableByteStream;\n  if (ReadableStreamHasBYOBReader(stream)) {\n    while (ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n      const pullIntoDescriptor = ReadableByteStreamControllerShiftPendingPullInto(controller);\n      ReadableByteStreamControllerCommitPullIntoDescriptor(stream, pullIntoDescriptor);\n    }\n  }\n}\n\nfunction ReadableByteStreamControllerRespondInReadableState(controller: ReadableByteStreamController,\n                                                            bytesWritten: number,\n                                                            pullIntoDescriptor: PullIntoDescriptor) {\n  assert(pullIntoDescriptor.bytesFilled + bytesWritten <= pullIntoDescriptor.byteLength);\n\n  ReadableByteStreamControllerFillHeadPullIntoDescriptor(controller, bytesWritten, pullIntoDescriptor);\n\n  if (pullIntoDescriptor.bytesFilled < pullIntoDescriptor.elementSize) {\n    return;\n  }\n\n  ReadableByteStreamControllerShiftPendingPullInto(controller);\n\n  const remainderSize = pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize;\n  if (remainderSize > 0) {\n    const end = pullIntoDescriptor.byteOffset + pullIntoDescriptor.bytesFilled;\n    const remainder = ArrayBufferSlice(pullIntoDescriptor.buffer, end - remainderSize, end);\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, remainder, 0, remainder.byteLength);\n  }\n\n  pullIntoDescriptor.bytesFilled -= remainderSize;\n  ReadableByteStreamControllerCommitPullIntoDescriptor(controller._controlledReadableByteStream, pullIntoDescriptor);\n\n  ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n}\n\nfunction ReadableByteStreamControllerRespondInternal(controller: ReadableByteStreamController, bytesWritten: number) {\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  assert(CanTransferArrayBuffer(firstDescriptor.buffer));\n\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n\n  const state = controller._controlledReadableByteStream._state;\n  if (state === 'closed') {\n    assert(bytesWritten === 0);\n    ReadableByteStreamControllerRespondInClosedState(controller, firstDescriptor);\n  } else {\n    assert(state === 'readable');\n    assert(bytesWritten > 0);\n    ReadableByteStreamControllerRespondInReadableState(controller, bytesWritten, firstDescriptor);\n  }\n\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nfunction ReadableByteStreamControllerShiftPendingPullInto(\n  controller: ReadableByteStreamController\n): PullIntoDescriptor {\n  assert(controller._byobRequest === null);\n  const descriptor = controller._pendingPullIntos.shift()!;\n  return descriptor;\n}\n\nfunction ReadableByteStreamControllerShouldCallPull(controller: ReadableByteStreamController): boolean {\n  const stream = controller._controlledReadableByteStream;\n\n  if (stream._state !== 'readable') {\n    return false;\n  }\n\n  if (controller._closeRequested) {\n    return false;\n  }\n\n  if (!controller._started) {\n    return false;\n  }\n\n  if (ReadableStreamHasDefaultReader(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    return true;\n  }\n\n  if (ReadableStreamHasBYOBReader(stream) && ReadableStreamGetNumReadIntoRequests(stream) > 0) {\n    return true;\n  }\n\n  const desiredSize = ReadableByteStreamControllerGetDesiredSize(controller);\n  assert(desiredSize !== null);\n  if (desiredSize! > 0) {\n    return true;\n  }\n\n  return false;\n}\n\nfunction ReadableByteStreamControllerClearAlgorithms(controller: ReadableByteStreamController) {\n  controller._pullAlgorithm = undefined!;\n  controller._cancelAlgorithm = undefined!;\n}\n\n// A client of ReadableByteStreamController may use these functions directly to bypass state check.\n\nexport function ReadableByteStreamControllerClose(controller: ReadableByteStreamController) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (controller._closeRequested || stream._state !== 'readable') {\n    return;\n  }\n\n  if (controller._queueTotalSize > 0) {\n    controller._closeRequested = true;\n\n    return;\n  }\n\n  if (controller._pendingPullIntos.length > 0) {\n    const firstPendingPullInto = controller._pendingPullIntos.peek();\n    if (firstPendingPullInto.bytesFilled > 0) {\n      const e = new TypeError('Insufficient bytes to fill elements in the given buffer');\n      ReadableByteStreamControllerError(controller, e);\n\n      throw e;\n    }\n  }\n\n  ReadableByteStreamControllerClearAlgorithms(controller);\n  ReadableStreamClose(stream);\n}\n\nexport function ReadableByteStreamControllerEnqueue(controller: ReadableByteStreamController, chunk: ArrayBufferView) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (controller._closeRequested || stream._state !== 'readable') {\n    return;\n  }\n\n  const buffer = chunk.buffer;\n  const byteOffset = chunk.byteOffset;\n  const byteLength = chunk.byteLength;\n  if (IsDetachedBuffer(buffer)) {\n    throw new TypeError('chunk\\'s buffer is detached and so cannot be enqueued');\n  }\n  const transferredBuffer = TransferArrayBuffer(buffer);\n\n  if (controller._pendingPullIntos.length > 0) {\n    const firstPendingPullInto = controller._pendingPullIntos.peek();\n    if (IsDetachedBuffer(firstPendingPullInto.buffer)) {\n      throw new TypeError(\n        'The BYOB request\\'s buffer has been detached and so cannot be filled with an enqueued chunk'\n      );\n    }\n    firstPendingPullInto.buffer = TransferArrayBuffer(firstPendingPullInto.buffer);\n  }\n\n  ReadableByteStreamControllerInvalidateBYOBRequest(controller);\n\n  if (ReadableStreamHasDefaultReader(stream)) {\n    if (ReadableStreamGetNumReadRequests(stream) === 0) {\n      assert(controller._pendingPullIntos.length === 0);\n      ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n    } else {\n      assert(controller._queue.length === 0);\n      if (controller._pendingPullIntos.length > 0) {\n        assert(controller._pendingPullIntos.peek().readerType === 'default');\n        ReadableByteStreamControllerShiftPendingPullInto(controller);\n      }\n      const transferredView = new Uint8Array(transferredBuffer, byteOffset, byteLength);\n      ReadableStreamFulfillReadRequest(stream, transferredView, false);\n    }\n  } else if (ReadableStreamHasBYOBReader(stream)) {\n    // TODO: Ideally in this branch detaching should happen only if the buffer is not consumed fully.\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n    ReadableByteStreamControllerProcessPullIntoDescriptorsUsingQueue(controller);\n  } else {\n    assert(!IsReadableStreamLocked(stream));\n    ReadableByteStreamControllerEnqueueChunkToQueue(controller, transferredBuffer, byteOffset, byteLength);\n  }\n\n  ReadableByteStreamControllerCallPullIfNeeded(controller);\n}\n\nexport function ReadableByteStreamControllerError(controller: ReadableByteStreamController, e: any) {\n  const stream = controller._controlledReadableByteStream;\n\n  if (stream._state !== 'readable') {\n    return;\n  }\n\n  ReadableByteStreamControllerClearPendingPullIntos(controller);\n\n  ResetQueue(controller);\n  ReadableByteStreamControllerClearAlgorithms(controller);\n  ReadableStreamError(stream, e);\n}\n\nexport function ReadableByteStreamControllerGetBYOBRequest(\n  controller: ReadableByteStreamController\n): ReadableStreamBYOBRequest | null {\n  if (controller._byobRequest === null && controller._pendingPullIntos.length > 0) {\n    const firstDescriptor = controller._pendingPullIntos.peek();\n    const view = new Uint8Array(firstDescriptor.buffer,\n                                firstDescriptor.byteOffset + firstDescriptor.bytesFilled,\n                                firstDescriptor.byteLength - firstDescriptor.bytesFilled);\n\n    const byobRequest: ReadableStreamBYOBRequest = Object.create(ReadableStreamBYOBRequest.prototype);\n    SetUpReadableStreamBYOBRequest(byobRequest, controller, view);\n    controller._byobRequest = byobRequest;\n  }\n  return controller._byobRequest;\n}\n\nfunction ReadableByteStreamControllerGetDesiredSize(controller: ReadableByteStreamController): number | null {\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'errored') {\n    return null;\n  }\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\nexport function ReadableByteStreamControllerRespond(controller: ReadableByteStreamController, bytesWritten: number) {\n  assert(controller._pendingPullIntos.length > 0);\n\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'closed') {\n    if (bytesWritten !== 0) {\n      throw new TypeError('bytesWritten must be 0 when calling respond() on a closed stream');\n    }\n  } else {\n    assert(state === 'readable');\n    if (bytesWritten === 0) {\n      throw new TypeError('bytesWritten must be greater than 0 when calling respond() on a readable stream');\n    }\n    if (firstDescriptor.bytesFilled + bytesWritten > firstDescriptor.byteLength) {\n      throw new RangeError('bytesWritten out of range');\n    }\n  }\n\n  firstDescriptor.buffer = TransferArrayBuffer(firstDescriptor.buffer);\n\n  ReadableByteStreamControllerRespondInternal(controller, bytesWritten);\n}\n\nexport function ReadableByteStreamControllerRespondWithNewView(controller: ReadableByteStreamController,\n                                                               view: ArrayBufferView) {\n  assert(controller._pendingPullIntos.length > 0);\n  assert(!IsDetachedBuffer(view.buffer));\n\n  const firstDescriptor = controller._pendingPullIntos.peek();\n  const state = controller._controlledReadableByteStream._state;\n\n  if (state === 'closed') {\n    if (view.byteLength !== 0) {\n      throw new TypeError('The view\\'s length must be 0 when calling respondWithNewView() on a closed stream');\n    }\n  } else {\n    assert(state === 'readable');\n    if (view.byteLength === 0) {\n      throw new TypeError(\n        'The view\\'s length must be greater than 0 when calling respondWithNewView() on a readable stream'\n      );\n    }\n  }\n\n  if (firstDescriptor.byteOffset + firstDescriptor.bytesFilled !== view.byteOffset) {\n    throw new RangeError('The region specified by view does not match byobRequest');\n  }\n  if (firstDescriptor.bufferByteLength !== view.buffer.byteLength) {\n    throw new RangeError('The buffer of view has different capacity than byobRequest');\n  }\n  if (firstDescriptor.bytesFilled + view.byteLength > firstDescriptor.byteLength) {\n    throw new RangeError('The region specified by view is larger than byobRequest');\n  }\n\n  const viewByteLength = view.byteLength;\n  firstDescriptor.buffer = TransferArrayBuffer(view.buffer);\n  ReadableByteStreamControllerRespondInternal(controller, viewByteLength);\n}\n\nexport function SetUpReadableByteStreamController(stream: ReadableByteStream,\n                                                  controller: ReadableByteStreamController,\n                                                  startAlgorithm: () => void | PromiseLike<void>,\n                                                  pullAlgorithm: () => Promise<void>,\n                                                  cancelAlgorithm: (reason: any) => Promise<void>,\n                                                  highWaterMark: number,\n                                                  autoAllocateChunkSize: number | undefined) {\n  assert(stream._readableStreamController === undefined);\n  if (autoAllocateChunkSize !== undefined) {\n    assert(NumberIsInteger(autoAllocateChunkSize));\n    assert(autoAllocateChunkSize > 0);\n  }\n\n  controller._controlledReadableByteStream = stream;\n\n  controller._pullAgain = false;\n  controller._pulling = false;\n\n  controller._byobRequest = null;\n\n  // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n  controller._queue = controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._closeRequested = false;\n  controller._started = false;\n\n  controller._strategyHWM = highWaterMark;\n\n  controller._pullAlgorithm = pullAlgorithm;\n  controller._cancelAlgorithm = cancelAlgorithm;\n\n  controller._autoAllocateChunkSize = autoAllocateChunkSize;\n\n  controller._pendingPullIntos = new SimpleQueue();\n\n  stream._readableStreamController = controller;\n\n  const startResult = startAlgorithm();\n  uponPromise(\n    promiseResolvedWith(startResult),\n    () => {\n      controller._started = true;\n\n      assert(!controller._pulling);\n      assert(!controller._pullAgain);\n\n      ReadableByteStreamControllerCallPullIfNeeded(controller);\n    },\n    r => {\n      ReadableByteStreamControllerError(controller, r);\n    }\n  );\n}\n\nexport function SetUpReadableByteStreamControllerFromUnderlyingSource(\n  stream: ReadableByteStream,\n  underlyingByteSource: ValidatedUnderlyingByteSource,\n  highWaterMark: number\n) {\n  const controller: ReadableByteStreamController = Object.create(ReadableByteStreamController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let pullAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let cancelAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingByteSource.start !== undefined) {\n    startAlgorithm = () => underlyingByteSource.start!(controller);\n  }\n  if (underlyingByteSource.pull !== undefined) {\n    pullAlgorithm = () => underlyingByteSource.pull!(controller);\n  }\n  if (underlyingByteSource.cancel !== undefined) {\n    cancelAlgorithm = reason => underlyingByteSource.cancel!(reason);\n  }\n\n  const autoAllocateChunkSize = underlyingByteSource.autoAllocateChunkSize;\n  if (autoAllocateChunkSize === 0) {\n    throw new TypeError('autoAllocateChunkSize must be greater than 0');\n  }\n\n  SetUpReadableByteStreamController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, autoAllocateChunkSize\n  );\n}\n\nfunction SetUpReadableStreamBYOBRequest(request: ReadableStreamBYOBRequest,\n                                        controller: ReadableByteStreamController,\n                                        view: ArrayBufferView) {\n  assert(IsReadableByteStreamController(controller));\n  assert(typeof view === 'object');\n  assert(ArrayBuffer.isView(view));\n  assert(!IsDetachedBuffer(view.buffer));\n  request._associatedReadableByteStreamController = controller;\n  request._view = view;\n}\n\n// Helper functions for the ReadableStreamBYOBRequest.\n\nfunction byobRequestBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamBYOBRequest.prototype.${name} can only be used on a ReadableStreamBYOBRequest`);\n}\n\n// Helper functions for the ReadableByteStreamController.\n\nfunction byteStreamControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableByteStreamController.prototype.${name} can only be used on a ReadableByteStreamController`);\n}\n","import assert from '../../stub/assert';\nimport { SimpleQueue } from '../simple-queue';\nimport {\n  ReadableStreamReaderGenericCancel,\n  ReadableStreamReaderGenericInitialize,\n  ReadableStreamReaderGenericRelease,\n  readerLockException\n} from './generic-reader';\nimport { IsReadableStreamLocked, ReadableByteStream, ReadableStream } from '../readable-stream';\nimport {\n  IsReadableByteStreamController,\n  ReadableByteStreamController,\n  ReadableByteStreamControllerPullInto\n} from './byte-stream-controller';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { newPromise, promiseRejectedWith } from '../helpers/webidl';\nimport { assertRequiredArgument } from '../validators/basic';\nimport { assertReadableStream } from '../validators/readable-stream';\nimport { IsDetachedBuffer } from '../abstract-ops/ecmascript';\n\n/**\n * A result returned by {@link ReadableStreamBYOBReader.read}.\n *\n * @public\n */\nexport type ReadableStreamBYOBReadResult<T extends ArrayBufferView> = {\n  done: false;\n  value: T;\n} | {\n  done: true;\n  value: T | undefined;\n};\n\n// Abstract operations for the ReadableStream.\n\nexport function AcquireReadableStreamBYOBReader(stream: ReadableByteStream): ReadableStreamBYOBReader {\n  return new ReadableStreamBYOBReader(stream);\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamAddReadIntoRequest<T extends ArrayBufferView>(stream: ReadableByteStream,\n                                                                            readIntoRequest: ReadIntoRequest<T>): void {\n  assert(IsReadableStreamBYOBReader(stream._reader));\n  assert(stream._state === 'readable' || stream._state === 'closed');\n\n  (stream._reader! as ReadableStreamBYOBReader)._readIntoRequests.push(readIntoRequest);\n}\n\nexport function ReadableStreamFulfillReadIntoRequest(stream: ReadableByteStream,\n                                                     chunk: ArrayBufferView,\n                                                     done: boolean) {\n  const reader = stream._reader as ReadableStreamBYOBReader;\n\n  assert(reader._readIntoRequests.length > 0);\n\n  const readIntoRequest = reader._readIntoRequests.shift()!;\n  if (done) {\n    readIntoRequest._closeSteps(chunk);\n  } else {\n    readIntoRequest._chunkSteps(chunk);\n  }\n}\n\nexport function ReadableStreamGetNumReadIntoRequests(stream: ReadableByteStream): number {\n  return (stream._reader as ReadableStreamBYOBReader)._readIntoRequests.length;\n}\n\nexport function ReadableStreamHasBYOBReader(stream: ReadableByteStream): boolean {\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return false;\n  }\n\n  if (!IsReadableStreamBYOBReader(reader)) {\n    return false;\n  }\n\n  return true;\n}\n\n// Readers\n\nexport interface ReadIntoRequest<T extends ArrayBufferView> {\n  _chunkSteps(chunk: T): void;\n\n  _closeSteps(chunk: T | undefined): void;\n\n  _errorSteps(e: any): void;\n}\n\n/**\n * A BYOB reader vended by a {@link ReadableStream}.\n *\n * @public\n */\nexport class ReadableStreamBYOBReader {\n  /** @internal */\n  _ownerReadableStream!: ReadableByteStream;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readIntoRequests: SimpleQueue<ReadIntoRequest<any>>;\n\n  constructor(stream: ReadableByteStream) {\n    assertRequiredArgument(stream, 1, 'ReadableStreamBYOBReader');\n    assertReadableStream(stream, 'First parameter');\n\n    if (IsReadableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive reading by another reader');\n    }\n\n    if (!IsReadableByteStreamController(stream._readableStreamController)) {\n      throw new TypeError('Cannot construct a ReadableStreamBYOBReader for a stream not constructed with a byte ' +\n        'source');\n    }\n\n    ReadableStreamReaderGenericInitialize(this, stream);\n\n    this._readIntoRequests = new SimpleQueue();\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or\n   * the reader's lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('cancel'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('cancel'));\n    }\n\n    return ReadableStreamReaderGenericCancel(this, reason);\n  }\n\n  /**\n   * Attempts to reads bytes into view, and returns a promise resolved with the result.\n   *\n   * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.\n   */\n  read<T extends ArrayBufferView>(view: T): Promise<ReadableStreamBYOBReadResult<T>> {\n    if (!IsReadableStreamBYOBReader(this)) {\n      return promiseRejectedWith(byobReaderBrandCheckException('read'));\n    }\n\n    if (!ArrayBuffer.isView(view)) {\n      return promiseRejectedWith(new TypeError('view must be an array buffer view'));\n    }\n    if (view.byteLength === 0) {\n      return promiseRejectedWith(new TypeError('view must have non-zero byteLength'));\n    }\n    if (view.buffer.byteLength === 0) {\n      return promiseRejectedWith(new TypeError(`view's buffer must have non-zero byteLength`));\n    }\n    if (IsDetachedBuffer(view.buffer)) {\n      return promiseRejectedWith(new TypeError('view\\'s buffer has been detached'));\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return promiseRejectedWith(readerLockException('read from'));\n    }\n\n    let resolvePromise!: (result: ReadableStreamBYOBReadResult<T>) => void;\n    let rejectPromise!: (reason: any) => void;\n    const promise = newPromise<ReadableStreamBYOBReadResult<T>>((resolve, reject) => {\n      resolvePromise = resolve;\n      rejectPromise = reject;\n    });\n    const readIntoRequest: ReadIntoRequest<T> = {\n      _chunkSteps: chunk => resolvePromise({ value: chunk, done: false }),\n      _closeSteps: chunk => resolvePromise({ value: chunk, done: true }),\n      _errorSteps: e => rejectPromise(e)\n    };\n    ReadableStreamBYOBReaderRead(this, view, readIntoRequest);\n    return promise;\n  }\n\n  /**\n   * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.\n   * If the associated stream is errored when the lock is released, the reader will appear errored in the same way\n   * from now on; otherwise, the reader will appear closed.\n   *\n   * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by\n   * the reader's {@link ReadableStreamBYOBReader.read | read()} method has not yet been settled. Attempting to\n   * do so will throw a `TypeError` and leave the reader locked to the stream.\n   */\n  releaseLock(): void {\n    if (!IsReadableStreamBYOBReader(this)) {\n      throw byobReaderBrandCheckException('releaseLock');\n    }\n\n    if (this._ownerReadableStream === undefined) {\n      return;\n    }\n\n    if (this._readIntoRequests.length > 0) {\n      throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');\n    }\n\n    ReadableStreamReaderGenericRelease(this);\n  }\n}\n\nObject.defineProperties(ReadableStreamBYOBReader.prototype, {\n  cancel: { enumerable: true },\n  read: { enumerable: true },\n  releaseLock: { enumerable: true },\n  closed: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamBYOBReader.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamBYOBReader',\n    configurable: true\n  });\n}\n\n// Abstract operations for the readers.\n\nexport function IsReadableStreamBYOBReader(x: any): x is ReadableStreamBYOBReader {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readIntoRequests')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamBYOBReader;\n}\n\nexport function ReadableStreamBYOBReaderRead<T extends ArrayBufferView>(\n  reader: ReadableStreamBYOBReader,\n  view: T,\n  readIntoRequest: ReadIntoRequest<T>\n): void {\n  const stream = reader._ownerReadableStream;\n\n  assert(stream !== undefined);\n\n  stream._disturbed = true;\n\n  if (stream._state === 'errored') {\n    readIntoRequest._errorSteps(stream._storedError);\n  } else {\n    ReadableByteStreamControllerPullInto(\n      stream._readableStreamController as ReadableByteStreamController,\n      view,\n      readIntoRequest\n    );\n  }\n}\n\n// Helper functions for the ReadableStreamBYOBReader.\n\nfunction byobReaderBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamBYOBReader.prototype.${name} can only be used on a ReadableStreamBYOBReader`);\n}\n","import { QueuingStrategy, QueuingStrategySizeCallback } from '../queuing-strategy';\nimport NumberIsNaN from '../../stub/number-isnan';\n\nexport function ExtractHighWaterMark(strategy: QueuingStrategy, defaultHWM: number): number {\n  const { highWaterMark } = strategy;\n\n  if (highWaterMark === undefined) {\n    return defaultHWM;\n  }\n\n  if (NumberIsNaN(highWaterMark) || highWaterMark < 0) {\n    throw new RangeError('Invalid highWaterMark');\n  }\n\n  return highWaterMark;\n}\n\nexport function ExtractSizeAlgorithm<T>(strategy: QueuingStrategy<T>): QueuingStrategySizeCallback<T> {\n  const { size } = strategy;\n\n  if (!size) {\n    return () => 1;\n  }\n\n  return size;\n}\n","import { QueuingStrategy, QueuingStrategySizeCallback } from '../queuing-strategy';\nimport { assertDictionary, assertFunction, convertUnrestrictedDouble } from './basic';\n\nexport function convertQueuingStrategy<T>(init: QueuingStrategy<T> | null | undefined,\n                                          context: string): QueuingStrategy<T> {\n  assertDictionary(init, context);\n  const highWaterMark = init?.highWaterMark;\n  const size = init?.size;\n  return {\n    highWaterMark: highWaterMark === undefined ? undefined : convertUnrestrictedDouble(highWaterMark),\n    size: size === undefined ? undefined : convertQueuingStrategySize(size, `${context} has member 'size' that`)\n  };\n}\n\nfunction convertQueuingStrategySize<T>(fn: QueuingStrategySizeCallback<T>,\n                                       context: string): QueuingStrategySizeCallback<T> {\n  assertFunction(fn, context);\n  return chunk => convertUnrestrictedDouble(fn(chunk));\n}\n","import { assertDictionary, assertFunction } from './basic';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\nimport {\n  UnderlyingSink,\n  UnderlyingSinkAbortCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  ValidatedUnderlyingSink\n} from '../writable-stream/underlying-sink';\nimport { WritableStreamDefaultController } from '../writable-stream';\n\nexport function convertUnderlyingSink<W>(original: UnderlyingSink<W> | null,\n                                         context: string): ValidatedUnderlyingSink<W> {\n  assertDictionary(original, context);\n  const abort = original?.abort;\n  const close = original?.close;\n  const start = original?.start;\n  const type = original?.type;\n  const write = original?.write;\n  return {\n    abort: abort === undefined ?\n      undefined :\n      convertUnderlyingSinkAbortCallback(abort, original!, `${context} has member 'abort' that`),\n    close: close === undefined ?\n      undefined :\n      convertUnderlyingSinkCloseCallback(close, original!, `${context} has member 'close' that`),\n    start: start === undefined ?\n      undefined :\n      convertUnderlyingSinkStartCallback(start, original!, `${context} has member 'start' that`),\n    write: write === undefined ?\n      undefined :\n      convertUnderlyingSinkWriteCallback(write, original!, `${context} has member 'write' that`),\n    type\n  };\n}\n\nfunction convertUnderlyingSinkAbortCallback(\n  fn: UnderlyingSinkAbortCallback,\n  original: UnderlyingSink,\n  context: string\n): (reason: any) => Promise<void> {\n  assertFunction(fn, context);\n  return (reason: any) => promiseCall(fn, original, [reason]);\n}\n\nfunction convertUnderlyingSinkCloseCallback(\n  fn: UnderlyingSinkCloseCallback,\n  original: UnderlyingSink,\n  context: string\n): () => Promise<void> {\n  assertFunction(fn, context);\n  return () => promiseCall(fn, original, []);\n}\n\nfunction convertUnderlyingSinkStartCallback(\n  fn: UnderlyingSinkStartCallback,\n  original: UnderlyingSink,\n  context: string\n): UnderlyingSinkStartCallback {\n  assertFunction(fn, context);\n  return (controller: WritableStreamDefaultController) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertUnderlyingSinkWriteCallback<W>(\n  fn: UnderlyingSinkWriteCallback<W>,\n  original: UnderlyingSink<W>,\n  context: string\n): (chunk: W, controller: WritableStreamDefaultController) => Promise<void> {\n  assertFunction(fn, context);\n  return (chunk: W, controller: WritableStreamDefaultController) => promiseCall(fn, original, [chunk, controller]);\n}\n","import { IsWritableStream, WritableStream } from '../writable-stream';\n\nexport function assertWritableStream(x: unknown, context: string): asserts x is WritableStream {\n  if (!IsWritableStream(x)) {\n    throw new TypeError(`${context} is not a WritableStream.`);\n  }\n}\n","/**\n * A signal object that allows you to communicate with a request and abort it if required\n * via its associated `AbortController` object.\n *\n * @remarks\n *   This interface is compatible with the `AbortSignal` interface defined in TypeScript's DOM types.\n *   It is redefined here, so it can be polyfilled without a DOM, for example with\n *   {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.\n *\n * @public\n */\nexport interface AbortSignal {\n  /**\n   * Whether the request is aborted.\n   */\n  readonly aborted: boolean;\n\n  /**\n   * Add an event listener to be triggered when this signal becomes aborted.\n   */\n  addEventListener(type: 'abort', listener: () => void): void;\n\n  /**\n   * Remove an event listener that was previously added with {@link AbortSignal.addEventListener}.\n   */\n  removeEventListener(type: 'abort', listener: () => void): void;\n}\n\nexport function isAbortSignal(value: unknown): value is AbortSignal {\n  if (typeof value !== 'object' || value === null) {\n    return false;\n  }\n  try {\n    return typeof (value as AbortSignal).aborted === 'boolean';\n  } catch {\n    // AbortSignal.prototype.aborted throws if its brand check fails\n    return false;\n  }\n}\n\n/**\n * A controller object that allows you to abort an `AbortSignal` when desired.\n *\n * @remarks\n *   This interface is compatible with the `AbortController` interface defined in TypeScript's DOM types.\n *   It is redefined here, so it can be polyfilled without a DOM, for example with\n *   {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.\n *\n * @internal\n */\nexport interface AbortController {\n  readonly signal: AbortSignal;\n\n  abort(): void;\n}\n\ninterface AbortControllerConstructor {\n  new(): AbortController;\n}\n\nconst supportsAbortController = typeof (AbortController as any) === 'function';\n\n/**\n * Construct a new AbortController, if supported by the platform.\n *\n * @internal\n */\nexport function createAbortController(): AbortController | undefined {\n  if (supportsAbortController) {\n    return new (AbortController as AbortControllerConstructor)();\n  }\n  return undefined;\n}\n","import assert from '../stub/assert';\nimport {\n  newPromise,\n  promiseRejectedWith,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  uponPromise\n} from './helpers/webidl';\nimport {\n  DequeueValue,\n  EnqueueValueWithSize,\n  PeekQueueValue,\n  QueuePair,\n  ResetQueue\n} from './abstract-ops/queue-with-sizes';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { SimpleQueue } from './simple-queue';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { AbortSteps, ErrorSteps } from './abstract-ops/internal-methods';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport {\n  UnderlyingSink,\n  UnderlyingSinkAbortCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  ValidatedUnderlyingSink\n} from './writable-stream/underlying-sink';\nimport { assertObject, assertRequiredArgument } from './validators/basic';\nimport { convertUnderlyingSink } from './validators/underlying-sink';\nimport { assertWritableStream } from './validators/writable-stream';\nimport { AbortController, AbortSignal, createAbortController } from './abort-signal';\n\ntype WritableStreamState = 'writable' | 'closed' | 'erroring' | 'errored';\n\ninterface WriteOrCloseRequest {\n  _resolve: (value?: undefined) => void;\n  _reject: (reason: any) => void;\n}\n\ntype WriteRequest = WriteOrCloseRequest;\ntype CloseRequest = WriteOrCloseRequest;\n\ninterface PendingAbortRequest {\n  _promise: Promise<undefined>;\n  _resolve: (value?: undefined) => void;\n  _reject: (reason: any) => void;\n  _reason: any;\n  _wasAlreadyErroring: boolean;\n}\n\n/**\n * A writable stream represents a destination for data, into which you can write.\n *\n * @public\n */\nclass WritableStream<W = any> {\n  /** @internal */\n  _state!: WritableStreamState;\n  /** @internal */\n  _storedError: any;\n  /** @internal */\n  _writer: WritableStreamDefaultWriter<W> | undefined;\n  /** @internal */\n  _writableStreamController!: WritableStreamDefaultController<W>;\n  /** @internal */\n  _writeRequests!: SimpleQueue<WriteRequest>;\n  /** @internal */\n  _inFlightWriteRequest: WriteRequest | undefined;\n  /** @internal */\n  _closeRequest: CloseRequest | undefined;\n  /** @internal */\n  _inFlightCloseRequest: CloseRequest | undefined;\n  /** @internal */\n  _pendingAbortRequest: PendingAbortRequest | undefined;\n  /** @internal */\n  _backpressure!: boolean;\n\n  constructor(underlyingSink?: UnderlyingSink<W>, strategy?: QueuingStrategy<W>);\n  constructor(rawUnderlyingSink: UnderlyingSink<W> | null | undefined = {},\n              rawStrategy: QueuingStrategy<W> | null | undefined = {}) {\n    if (rawUnderlyingSink === undefined) {\n      rawUnderlyingSink = null;\n    } else {\n      assertObject(rawUnderlyingSink, 'First parameter');\n    }\n\n    const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');\n    const underlyingSink = convertUnderlyingSink(rawUnderlyingSink, 'First parameter');\n\n    InitializeWritableStream(this);\n\n    const type = underlyingSink.type;\n    if (type !== undefined) {\n      throw new RangeError('Invalid type is specified');\n    }\n\n    const sizeAlgorithm = ExtractSizeAlgorithm(strategy);\n    const highWaterMark = ExtractHighWaterMark(strategy, 1);\n\n    SetUpWritableStreamDefaultControllerFromUnderlyingSink(this, underlyingSink, highWaterMark, sizeAlgorithm);\n  }\n\n  /**\n   * Returns whether or not the writable stream is locked to a writer.\n   */\n  get locked(): boolean {\n    if (!IsWritableStream(this)) {\n      throw streamBrandCheckException('locked');\n    }\n\n    return IsWritableStreamLocked(this);\n  }\n\n  /**\n   * Aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be\n   * immediately moved to an errored state, with any queued-up writes discarded. This will also execute any abort\n   * mechanism of the underlying sink.\n   *\n   * The returned promise will fulfill if the stream shuts down successfully, or reject if the underlying sink signaled\n   * that there was an error doing so. Additionally, it will reject with a `TypeError` (without attempting to cancel\n   * the stream) if the stream is currently locked.\n   */\n  abort(reason: any = undefined): Promise<void> {\n    if (!IsWritableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('abort'));\n    }\n\n    if (IsWritableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot abort a stream that already has a writer'));\n    }\n\n    return WritableStreamAbort(this, reason);\n  }\n\n  /**\n   * Closes the stream. The underlying sink will finish processing any previously-written chunks, before invoking its\n   * close behavior. During this time any further attempts to write will fail (without erroring the stream).\n   *\n   * The method returns a promise that will fulfill if all remaining chunks are successfully written and the stream\n   * successfully closes, or rejects if an error is encountered during this process. Additionally, it will reject with\n   * a `TypeError` (without attempting to cancel the stream) if the stream is currently locked.\n   */\n  close() {\n    if (!IsWritableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('close'));\n    }\n\n    if (IsWritableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot close a stream that already has a writer'));\n    }\n\n    if (WritableStreamCloseQueuedOrInFlight(this)) {\n      return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));\n    }\n\n    return WritableStreamClose(this);\n  }\n\n  /**\n   * Creates a {@link WritableStreamDefaultWriter | writer} and locks the stream to the new writer. While the stream\n   * is locked, no other writer can be acquired until this one is released.\n   *\n   * This functionality is especially useful for creating abstractions that desire the ability to write to a stream\n   * without interruption or interleaving. By getting a writer for the stream, you can ensure nobody else can write at\n   * the same time, which would cause the resulting written data to be unpredictable and probably useless.\n   */\n  getWriter(): WritableStreamDefaultWriter<W> {\n    if (!IsWritableStream(this)) {\n      throw streamBrandCheckException('getWriter');\n    }\n\n    return AcquireWritableStreamDefaultWriter(this);\n  }\n}\n\nObject.defineProperties(WritableStream.prototype, {\n  abort: { enumerable: true },\n  close: { enumerable: true },\n  getWriter: { enumerable: true },\n  locked: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStream.prototype, Symbol.toStringTag, {\n    value: 'WritableStream',\n    configurable: true\n  });\n}\n\nexport {\n  AcquireWritableStreamDefaultWriter,\n  CreateWritableStream,\n  IsWritableStream,\n  IsWritableStreamLocked,\n  WritableStream,\n  WritableStreamAbort,\n  WritableStreamDefaultControllerErrorIfNeeded,\n  WritableStreamDefaultWriterCloseWithErrorPropagation,\n  WritableStreamDefaultWriterRelease,\n  WritableStreamDefaultWriterWrite,\n  WritableStreamCloseQueuedOrInFlight,\n  UnderlyingSink,\n  UnderlyingSinkStartCallback,\n  UnderlyingSinkWriteCallback,\n  UnderlyingSinkCloseCallback,\n  UnderlyingSinkAbortCallback\n};\n\n// Abstract operations for the WritableStream.\n\nfunction AcquireWritableStreamDefaultWriter<W>(stream: WritableStream<W>): WritableStreamDefaultWriter<W> {\n  return new WritableStreamDefaultWriter(stream);\n}\n\n// Throws if and only if startAlgorithm throws.\nfunction CreateWritableStream<W>(startAlgorithm: () => void | PromiseLike<void>,\n                                 writeAlgorithm: (chunk: W) => Promise<void>,\n                                 closeAlgorithm: () => Promise<void>,\n                                 abortAlgorithm: (reason: any) => Promise<void>,\n                                 highWaterMark = 1,\n                                 sizeAlgorithm: QueuingStrategySizeCallback<W> = () => 1) {\n  assert(IsNonNegativeNumber(highWaterMark));\n\n  const stream: WritableStream<W> = Object.create(WritableStream.prototype);\n  InitializeWritableStream(stream);\n\n  const controller: WritableStreamDefaultController<W> = Object.create(WritableStreamDefaultController.prototype);\n\n  SetUpWritableStreamDefaultController(stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm,\n                                       abortAlgorithm, highWaterMark, sizeAlgorithm);\n  return stream;\n}\n\nfunction InitializeWritableStream<W>(stream: WritableStream<W>) {\n  stream._state = 'writable';\n\n  // The error that will be reported by new method calls once the state becomes errored. Only set when [[state]] is\n  // 'erroring' or 'errored'. May be set to an undefined value.\n  stream._storedError = undefined;\n\n  stream._writer = undefined;\n\n  // Initialize to undefined first because the constructor of the controller checks this\n  // variable to validate the caller.\n  stream._writableStreamController = undefined!;\n\n  // This queue is placed here instead of the writer class in order to allow for passing a writer to the next data\n  // producer without waiting for the queued writes to finish.\n  stream._writeRequests = new SimpleQueue();\n\n  // Write requests are removed from _writeRequests when write() is called on the underlying sink. This prevents\n  // them from being erroneously rejected on error. If a write() call is in-flight, the request is stored here.\n  stream._inFlightWriteRequest = undefined;\n\n  // The promise that was returned from writer.close(). Stored here because it may be fulfilled after the writer\n  // has been detached.\n  stream._closeRequest = undefined;\n\n  // Close request is removed from _closeRequest when close() is called on the underlying sink. This prevents it\n  // from being erroneously rejected on error. If a close() call is in-flight, the request is stored here.\n  stream._inFlightCloseRequest = undefined;\n\n  // The promise that was returned from writer.abort(). This may also be fulfilled after the writer has detached.\n  stream._pendingAbortRequest = undefined;\n\n  // The backpressure signal set by the controller.\n  stream._backpressure = false;\n}\n\nfunction IsWritableStream(x: unknown): x is WritableStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_writableStreamController')) {\n    return false;\n  }\n\n  return x instanceof WritableStream;\n}\n\nfunction IsWritableStreamLocked(stream: WritableStream): boolean {\n  assert(IsWritableStream(stream));\n\n  if (stream._writer === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamAbort(stream: WritableStream, reason: any): Promise<undefined> {\n  if (stream._state === 'closed' || stream._state === 'errored') {\n    return promiseResolvedWith(undefined);\n  }\n  stream._writableStreamController._abortReason = reason;\n  stream._writableStreamController._abortController?.abort();\n\n  // TypeScript narrows the type of `stream._state` down to 'writable' | 'erroring',\n  // but it doesn't know that signaling abort runs author code that might have changed the state.\n  // Widen the type again by casting to WritableStreamState.\n  const state = stream._state as WritableStreamState;\n\n  if (state === 'closed' || state === 'errored') {\n    return promiseResolvedWith(undefined);\n  }\n  if (stream._pendingAbortRequest !== undefined) {\n    return stream._pendingAbortRequest._promise;\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n\n  let wasAlreadyErroring = false;\n  if (state === 'erroring') {\n    wasAlreadyErroring = true;\n    // reason will not be used, so don't keep a reference to it.\n    reason = undefined;\n  }\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    stream._pendingAbortRequest = {\n      _promise: undefined!,\n      _resolve: resolve,\n      _reject: reject,\n      _reason: reason,\n      _wasAlreadyErroring: wasAlreadyErroring\n    };\n  });\n  stream._pendingAbortRequest!._promise = promise;\n\n  if (!wasAlreadyErroring) {\n    WritableStreamStartErroring(stream, reason);\n  }\n\n  return promise;\n}\n\nfunction WritableStreamClose(stream: WritableStream<any>): Promise<undefined> {\n  const state = stream._state;\n  if (state === 'closed' || state === 'errored') {\n    return promiseRejectedWith(new TypeError(\n      `The stream (in ${state} state) is not in the writable state and cannot be closed`));\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n  assert(!WritableStreamCloseQueuedOrInFlight(stream));\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    const closeRequest: CloseRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._closeRequest = closeRequest;\n  });\n\n  const writer = stream._writer;\n  if (writer !== undefined && stream._backpressure && state === 'writable') {\n    defaultWriterReadyPromiseResolve(writer);\n  }\n\n  WritableStreamDefaultControllerClose(stream._writableStreamController);\n\n  return promise;\n}\n\n// WritableStream API exposed for controllers.\n\nfunction WritableStreamAddWriteRequest(stream: WritableStream): Promise<undefined> {\n  assert(IsWritableStreamLocked(stream));\n  assert(stream._state === 'writable');\n\n  const promise = newPromise<undefined>((resolve, reject) => {\n    const writeRequest: WriteRequest = {\n      _resolve: resolve,\n      _reject: reject\n    };\n\n    stream._writeRequests.push(writeRequest);\n  });\n\n  return promise;\n}\n\nfunction WritableStreamDealWithRejection(stream: WritableStream, error: any) {\n  const state = stream._state;\n\n  if (state === 'writable') {\n    WritableStreamStartErroring(stream, error);\n    return;\n  }\n\n  assert(state === 'erroring');\n  WritableStreamFinishErroring(stream);\n}\n\nfunction WritableStreamStartErroring(stream: WritableStream, reason: any) {\n  assert(stream._storedError === undefined);\n  assert(stream._state === 'writable');\n\n  const controller = stream._writableStreamController;\n  assert(controller !== undefined);\n\n  stream._state = 'erroring';\n  stream._storedError = reason;\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason);\n  }\n\n  if (!WritableStreamHasOperationMarkedInFlight(stream) && controller._started) {\n    WritableStreamFinishErroring(stream);\n  }\n}\n\nfunction WritableStreamFinishErroring(stream: WritableStream) {\n  assert(stream._state === 'erroring');\n  assert(!WritableStreamHasOperationMarkedInFlight(stream));\n  stream._state = 'errored';\n  stream._writableStreamController[ErrorSteps]();\n\n  const storedError = stream._storedError;\n  stream._writeRequests.forEach(writeRequest => {\n    writeRequest._reject(storedError);\n  });\n  stream._writeRequests = new SimpleQueue();\n\n  if (stream._pendingAbortRequest === undefined) {\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    return;\n  }\n\n  const abortRequest = stream._pendingAbortRequest;\n  stream._pendingAbortRequest = undefined;\n\n  if (abortRequest._wasAlreadyErroring) {\n    abortRequest._reject(storedError);\n    WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    return;\n  }\n\n  const promise = stream._writableStreamController[AbortSteps](abortRequest._reason);\n  uponPromise(\n    promise,\n    () => {\n      abortRequest._resolve();\n      WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    },\n    (reason: any) => {\n      abortRequest._reject(reason);\n      WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream);\n    });\n}\n\nfunction WritableStreamFinishInFlightWrite(stream: WritableStream) {\n  assert(stream._inFlightWriteRequest !== undefined);\n  stream._inFlightWriteRequest!._resolve(undefined);\n  stream._inFlightWriteRequest = undefined;\n}\n\nfunction WritableStreamFinishInFlightWriteWithError(stream: WritableStream, error: any) {\n  assert(stream._inFlightWriteRequest !== undefined);\n  stream._inFlightWriteRequest!._reject(error);\n  stream._inFlightWriteRequest = undefined;\n\n  assert(stream._state === 'writable' || stream._state === 'erroring');\n\n  WritableStreamDealWithRejection(stream, error);\n}\n\nfunction WritableStreamFinishInFlightClose(stream: WritableStream) {\n  assert(stream._inFlightCloseRequest !== undefined);\n  stream._inFlightCloseRequest!._resolve(undefined);\n  stream._inFlightCloseRequest = undefined;\n\n  const state = stream._state;\n\n  assert(state === 'writable' || state === 'erroring');\n\n  if (state === 'erroring') {\n    // The error was too late to do anything, so it is ignored.\n    stream._storedError = undefined;\n    if (stream._pendingAbortRequest !== undefined) {\n      stream._pendingAbortRequest._resolve();\n      stream._pendingAbortRequest = undefined;\n    }\n  }\n\n  stream._state = 'closed';\n\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    defaultWriterClosedPromiseResolve(writer);\n  }\n\n  assert(stream._pendingAbortRequest === undefined);\n  assert(stream._storedError === undefined);\n}\n\nfunction WritableStreamFinishInFlightCloseWithError(stream: WritableStream, error: any) {\n  assert(stream._inFlightCloseRequest !== undefined);\n  stream._inFlightCloseRequest!._reject(error);\n  stream._inFlightCloseRequest = undefined;\n\n  assert(stream._state === 'writable' || stream._state === 'erroring');\n\n  // Never execute sink abort() after sink close().\n  if (stream._pendingAbortRequest !== undefined) {\n    stream._pendingAbortRequest._reject(error);\n    stream._pendingAbortRequest = undefined;\n  }\n  WritableStreamDealWithRejection(stream, error);\n}\n\n// TODO(ricea): Fix alphabetical order.\nfunction WritableStreamCloseQueuedOrInFlight(stream: WritableStream): boolean {\n  if (stream._closeRequest === undefined && stream._inFlightCloseRequest === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamHasOperationMarkedInFlight(stream: WritableStream): boolean {\n  if (stream._inFlightWriteRequest === undefined && stream._inFlightCloseRequest === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\nfunction WritableStreamMarkCloseRequestInFlight(stream: WritableStream) {\n  assert(stream._inFlightCloseRequest === undefined);\n  assert(stream._closeRequest !== undefined);\n  stream._inFlightCloseRequest = stream._closeRequest;\n  stream._closeRequest = undefined;\n}\n\nfunction WritableStreamMarkFirstWriteRequestInFlight(stream: WritableStream) {\n  assert(stream._inFlightWriteRequest === undefined);\n  assert(stream._writeRequests.length !== 0);\n  stream._inFlightWriteRequest = stream._writeRequests.shift();\n}\n\nfunction WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream: WritableStream) {\n  assert(stream._state === 'errored');\n  if (stream._closeRequest !== undefined) {\n    assert(stream._inFlightCloseRequest === undefined);\n\n    stream._closeRequest._reject(stream._storedError);\n    stream._closeRequest = undefined;\n  }\n  const writer = stream._writer;\n  if (writer !== undefined) {\n    defaultWriterClosedPromiseReject(writer, stream._storedError);\n  }\n}\n\nfunction WritableStreamUpdateBackpressure(stream: WritableStream, backpressure: boolean) {\n  assert(stream._state === 'writable');\n  assert(!WritableStreamCloseQueuedOrInFlight(stream));\n\n  const writer = stream._writer;\n  if (writer !== undefined && backpressure !== stream._backpressure) {\n    if (backpressure) {\n      defaultWriterReadyPromiseReset(writer);\n    } else {\n      assert(!backpressure);\n\n      defaultWriterReadyPromiseResolve(writer);\n    }\n  }\n\n  stream._backpressure = backpressure;\n}\n\n/**\n * A default writer vended by a {@link WritableStream}.\n *\n * @public\n */\nexport class WritableStreamDefaultWriter<W = any> {\n  /** @internal */\n  _ownerWritableStream: WritableStream<W>;\n  /** @internal */\n  _closedPromise!: Promise<undefined>;\n  /** @internal */\n  _closedPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _closedPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _closedPromiseState!: 'pending' | 'resolved' | 'rejected';\n  /** @internal */\n  _readyPromise!: Promise<undefined>;\n  /** @internal */\n  _readyPromise_resolve?: (value?: undefined) => void;\n  /** @internal */\n  _readyPromise_reject?: (reason: any) => void;\n  /** @internal */\n  _readyPromiseState!: 'pending' | 'fulfilled' | 'rejected';\n\n  constructor(stream: WritableStream<W>) {\n    assertRequiredArgument(stream, 1, 'WritableStreamDefaultWriter');\n    assertWritableStream(stream, 'First parameter');\n\n    if (IsWritableStreamLocked(stream)) {\n      throw new TypeError('This stream has already been locked for exclusive writing by another writer');\n    }\n\n    this._ownerWritableStream = stream;\n    stream._writer = this;\n\n    const state = stream._state;\n\n    if (state === 'writable') {\n      if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._backpressure) {\n        defaultWriterReadyPromiseInitialize(this);\n      } else {\n        defaultWriterReadyPromiseInitializeAsResolved(this);\n      }\n\n      defaultWriterClosedPromiseInitialize(this);\n    } else if (state === 'erroring') {\n      defaultWriterReadyPromiseInitializeAsRejected(this, stream._storedError);\n      defaultWriterClosedPromiseInitialize(this);\n    } else if (state === 'closed') {\n      defaultWriterReadyPromiseInitializeAsResolved(this);\n      defaultWriterClosedPromiseInitializeAsResolved(this);\n    } else {\n      assert(state === 'errored');\n\n      const storedError = stream._storedError;\n      defaultWriterReadyPromiseInitializeAsRejected(this, storedError);\n      defaultWriterClosedPromiseInitializeAsRejected(this, storedError);\n    }\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or\n   * the writer’s lock is released before the stream finishes closing.\n   */\n  get closed(): Promise<undefined> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('closed'));\n    }\n\n    return this._closedPromise;\n  }\n\n  /**\n   * Returns the desired size to fill the stream’s internal queue. It can be negative, if the queue is over-full.\n   * A producer can use this information to determine the right amount of data to write.\n   *\n   * It will be `null` if the stream cannot be successfully written to (due to either being errored, or having an abort\n   * queued up). It will return zero if the stream is closed. And the getter will throw an exception if invoked when\n   * the writer’s lock is released.\n   */\n  get desiredSize(): number | null {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      throw defaultWriterBrandCheckException('desiredSize');\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      throw defaultWriterLockException('desiredSize');\n    }\n\n    return WritableStreamDefaultWriterGetDesiredSize(this);\n  }\n\n  /**\n   * Returns a promise that will be fulfilled when the desired size to fill the stream’s internal queue transitions\n   * from non-positive to positive, signaling that it is no longer applying backpressure. Once the desired size dips\n   * back to zero or below, the getter will return a new promise that stays pending until the next transition.\n   *\n   * If the stream becomes errored or aborted, or the writer’s lock is released, the returned promise will become\n   * rejected.\n   */\n  get ready(): Promise<undefined> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('ready'));\n    }\n\n    return this._readyPromise;\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link WritableStream.abort | stream.abort(reason)}.\n   */\n  abort(reason: any = undefined): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('abort'));\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('abort'));\n    }\n\n    return WritableStreamDefaultWriterAbort(this, reason);\n  }\n\n  /**\n   * If the reader is active, behaves the same as {@link WritableStream.close | stream.close()}.\n   */\n  close(): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('close'));\n    }\n\n    const stream = this._ownerWritableStream;\n\n    if (stream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('close'));\n    }\n\n    if (WritableStreamCloseQueuedOrInFlight(stream)) {\n      return promiseRejectedWith(new TypeError('Cannot close an already-closing stream'));\n    }\n\n    return WritableStreamDefaultWriterClose(this);\n  }\n\n  /**\n   * Releases the writer’s lock on the corresponding stream. After the lock is released, the writer is no longer active.\n   * If the associated stream is errored when the lock is released, the writer will appear errored in the same way from\n   * now on; otherwise, the writer will appear closed.\n   *\n   * Note that the lock can still be released even if some ongoing writes have not yet finished (i.e. even if the\n   * promises returned from previous calls to {@link WritableStreamDefaultWriter.write | write()} have not yet settled).\n   * It’s not necessary to hold the lock on the writer for the duration of the write; the lock instead simply prevents\n   * other producers from writing in an interleaved manner.\n   */\n  releaseLock(): void {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      throw defaultWriterBrandCheckException('releaseLock');\n    }\n\n    const stream = this._ownerWritableStream;\n\n    if (stream === undefined) {\n      return;\n    }\n\n    assert(stream._writer !== undefined);\n\n    WritableStreamDefaultWriterRelease(this);\n  }\n\n  /**\n   * Writes the given chunk to the writable stream, by waiting until any previous writes have finished successfully,\n   * and then sending the chunk to the underlying sink's {@link UnderlyingSink.write | write()} method. It will return\n   * a promise that fulfills with undefined upon a successful write, or rejects if the write fails or stream becomes\n   * errored before the writing process is initiated.\n   *\n   * Note that what \"success\" means is up to the underlying sink; it might indicate simply that the chunk has been\n   * accepted, and not necessarily that it is safely saved to its ultimate destination.\n   */\n  write(chunk: W): Promise<void>;\n  write(chunk: W = undefined!): Promise<void> {\n    if (!IsWritableStreamDefaultWriter(this)) {\n      return promiseRejectedWith(defaultWriterBrandCheckException('write'));\n    }\n\n    if (this._ownerWritableStream === undefined) {\n      return promiseRejectedWith(defaultWriterLockException('write to'));\n    }\n\n    return WritableStreamDefaultWriterWrite(this, chunk);\n  }\n}\n\nObject.defineProperties(WritableStreamDefaultWriter.prototype, {\n  abort: { enumerable: true },\n  close: { enumerable: true },\n  releaseLock: { enumerable: true },\n  write: { enumerable: true },\n  closed: { enumerable: true },\n  desiredSize: { enumerable: true },\n  ready: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStreamDefaultWriter.prototype, Symbol.toStringTag, {\n    value: 'WritableStreamDefaultWriter',\n    configurable: true\n  });\n}\n\n// Abstract operations for the WritableStreamDefaultWriter.\n\nfunction IsWritableStreamDefaultWriter<W = any>(x: any): x is WritableStreamDefaultWriter<W> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) {\n    return false;\n  }\n\n  return x instanceof WritableStreamDefaultWriter;\n}\n\n// A client of WritableStreamDefaultWriter may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultWriterAbort(writer: WritableStreamDefaultWriter, reason: any) {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  return WritableStreamAbort(stream, reason);\n}\n\nfunction WritableStreamDefaultWriterClose(writer: WritableStreamDefaultWriter): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  return WritableStreamClose(stream);\n}\n\nfunction WritableStreamDefaultWriterCloseWithErrorPropagation(writer: WritableStreamDefaultWriter): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  const state = stream._state;\n  if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {\n    return promiseResolvedWith(undefined);\n  }\n\n  if (state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  assert(state === 'writable' || state === 'erroring');\n\n  return WritableStreamDefaultWriterClose(writer);\n}\n\nfunction WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer: WritableStreamDefaultWriter, error: any) {\n  if (writer._closedPromiseState === 'pending') {\n    defaultWriterClosedPromiseReject(writer, error);\n  } else {\n    defaultWriterClosedPromiseResetToRejected(writer, error);\n  }\n}\n\nfunction WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer: WritableStreamDefaultWriter, error: any) {\n  if (writer._readyPromiseState === 'pending') {\n    defaultWriterReadyPromiseReject(writer, error);\n  } else {\n    defaultWriterReadyPromiseResetToRejected(writer, error);\n  }\n}\n\nfunction WritableStreamDefaultWriterGetDesiredSize(writer: WritableStreamDefaultWriter): number | null {\n  const stream = writer._ownerWritableStream;\n  const state = stream._state;\n\n  if (state === 'errored' || state === 'erroring') {\n    return null;\n  }\n\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return WritableStreamDefaultControllerGetDesiredSize(stream._writableStreamController);\n}\n\nfunction WritableStreamDefaultWriterRelease(writer: WritableStreamDefaultWriter) {\n  const stream = writer._ownerWritableStream;\n  assert(stream !== undefined);\n  assert(stream._writer === writer);\n\n  const releasedError = new TypeError(\n    `Writer was released and can no longer be used to monitor the stream's closedness`);\n\n  WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, releasedError);\n\n  // The state transitions to \"errored\" before the sink abort() method runs, but the writer.closed promise is not\n  // rejected until afterwards. This means that simply testing state will not work.\n  WritableStreamDefaultWriterEnsureClosedPromiseRejected(writer, releasedError);\n\n  stream._writer = undefined;\n  writer._ownerWritableStream = undefined!;\n}\n\nfunction WritableStreamDefaultWriterWrite<W>(writer: WritableStreamDefaultWriter<W>, chunk: W): Promise<undefined> {\n  const stream = writer._ownerWritableStream;\n\n  assert(stream !== undefined);\n\n  const controller = stream._writableStreamController;\n\n  const chunkSize = WritableStreamDefaultControllerGetChunkSize(controller, chunk);\n\n  if (stream !== writer._ownerWritableStream) {\n    return promiseRejectedWith(defaultWriterLockException('write to'));\n  }\n\n  const state = stream._state;\n  if (state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n  if (WritableStreamCloseQueuedOrInFlight(stream) || state === 'closed') {\n    return promiseRejectedWith(new TypeError('The stream is closing or closed and cannot be written to'));\n  }\n  if (state === 'erroring') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  assert(state === 'writable');\n\n  const promise = WritableStreamAddWriteRequest(stream);\n\n  WritableStreamDefaultControllerWrite(controller, chunk, chunkSize);\n\n  return promise;\n}\n\nconst closeSentinel: unique symbol = {} as any;\n\ntype QueueRecord<W> = W | typeof closeSentinel;\n\n/**\n * Allows control of a {@link WritableStream | writable stream}'s state and internal queue.\n *\n * @public\n */\nexport class WritableStreamDefaultController<W = any> {\n  /** @internal */\n  _controlledWritableStream!: WritableStream<W>;\n  /** @internal */\n  _queue!: SimpleQueue<QueuePair<QueueRecord<W>>>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _abortReason: any;\n  /** @internal */\n  _abortController: AbortController | undefined;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _strategySizeAlgorithm!: QueuingStrategySizeCallback<W>;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _writeAlgorithm!: (chunk: W) => Promise<void>;\n  /** @internal */\n  _closeAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _abortAlgorithm!: (reason: any) => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * The reason which was passed to `WritableStream.abort(reason)` when the stream was aborted.\n   *\n   * @deprecated\n   *  This property has been removed from the specification, see https://github.com/whatwg/streams/pull/1177.\n   *  Use {@link WritableStreamDefaultController.signal}'s `reason` instead.\n   */\n  get abortReason(): any {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('abortReason');\n    }\n    return this._abortReason;\n  }\n\n  /**\n   * An `AbortSignal` that can be used to abort the pending write or close operation when the stream is aborted.\n   */\n  get signal(): AbortSignal {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('signal');\n    }\n    if (this._abortController === undefined) {\n      // Older browsers or older Node versions may not support `AbortController` or `AbortSignal`.\n      // We don't want to bundle and ship an `AbortController` polyfill together with our polyfill,\n      // so instead we only implement support for `signal` if we find a global `AbortController` constructor.\n      throw new TypeError('WritableStreamDefaultController.prototype.signal is not supported');\n    }\n    return this._abortController.signal;\n  }\n\n  /**\n   * Closes the controlled writable stream, making all future interactions with it fail with the given error `e`.\n   *\n   * This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying\n   * sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the\n   * normal lifecycle of interactions with the underlying sink.\n   */\n  error(e: any = undefined): void {\n    if (!IsWritableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n    const state = this._controlledWritableStream._state;\n    if (state !== 'writable') {\n      // The stream is closed, errored or will be soon. The sink can't do anything useful if it gets an error here, so\n      // just treat it as a no-op.\n      return;\n    }\n\n    WritableStreamDefaultControllerError(this, e);\n  }\n\n  /** @internal */\n  [AbortSteps](reason: any): Promise<void> {\n    const result = this._abortAlgorithm(reason);\n    WritableStreamDefaultControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [ErrorSteps]() {\n    ResetQueue(this);\n  }\n}\n\nObject.defineProperties(WritableStreamDefaultController.prototype, {\n  abortReason: { enumerable: true },\n  signal: { enumerable: true },\n  error: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(WritableStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'WritableStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Abstract operations implementing interface required by the WritableStream.\n\nfunction IsWritableStreamDefaultController(x: any): x is WritableStreamDefaultController<any> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledWritableStream')) {\n    return false;\n  }\n\n  return x instanceof WritableStreamDefaultController;\n}\n\nfunction SetUpWritableStreamDefaultController<W>(stream: WritableStream<W>,\n                                                 controller: WritableStreamDefaultController<W>,\n                                                 startAlgorithm: () => void | PromiseLike<void>,\n                                                 writeAlgorithm: (chunk: W) => Promise<void>,\n                                                 closeAlgorithm: () => Promise<void>,\n                                                 abortAlgorithm: (reason: any) => Promise<void>,\n                                                 highWaterMark: number,\n                                                 sizeAlgorithm: QueuingStrategySizeCallback<W>) {\n  assert(IsWritableStream(stream));\n  assert(stream._writableStreamController === undefined);\n\n  controller._controlledWritableStream = stream;\n  stream._writableStreamController = controller;\n\n  // Need to set the slots so that the assert doesn't fire. In the spec the slots already exist implicitly.\n  controller._queue = undefined!;\n  controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._abortReason = undefined;\n  controller._abortController = createAbortController();\n  controller._started = false;\n\n  controller._strategySizeAlgorithm = sizeAlgorithm;\n  controller._strategyHWM = highWaterMark;\n\n  controller._writeAlgorithm = writeAlgorithm;\n  controller._closeAlgorithm = closeAlgorithm;\n  controller._abortAlgorithm = abortAlgorithm;\n\n  const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n  WritableStreamUpdateBackpressure(stream, backpressure);\n\n  const startResult = startAlgorithm();\n  const startPromise = promiseResolvedWith(startResult);\n  uponPromise(\n    startPromise,\n    () => {\n      assert(stream._state === 'writable' || stream._state === 'erroring');\n      controller._started = true;\n      WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n    },\n    r => {\n      assert(stream._state === 'writable' || stream._state === 'erroring');\n      controller._started = true;\n      WritableStreamDealWithRejection(stream, r);\n    }\n  );\n}\n\nfunction SetUpWritableStreamDefaultControllerFromUnderlyingSink<W>(stream: WritableStream<W>,\n                                                                   underlyingSink: ValidatedUnderlyingSink<W>,\n                                                                   highWaterMark: number,\n                                                                   sizeAlgorithm: QueuingStrategySizeCallback<W>) {\n  const controller = Object.create(WritableStreamDefaultController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let writeAlgorithm: (chunk: W) => Promise<void> = () => promiseResolvedWith(undefined);\n  let closeAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let abortAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingSink.start !== undefined) {\n    startAlgorithm = () => underlyingSink.start!(controller);\n  }\n  if (underlyingSink.write !== undefined) {\n    writeAlgorithm = chunk => underlyingSink.write!(chunk, controller);\n  }\n  if (underlyingSink.close !== undefined) {\n    closeAlgorithm = () => underlyingSink.close!();\n  }\n  if (underlyingSink.abort !== undefined) {\n    abortAlgorithm = reason => underlyingSink.abort!(reason);\n  }\n\n  SetUpWritableStreamDefaultController(\n    stream, controller, startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm, highWaterMark, sizeAlgorithm\n  );\n}\n\n// ClearAlgorithms may be called twice. Erroring the same stream in multiple ways will often result in redundant calls.\nfunction WritableStreamDefaultControllerClearAlgorithms(controller: WritableStreamDefaultController<any>) {\n  controller._writeAlgorithm = undefined!;\n  controller._closeAlgorithm = undefined!;\n  controller._abortAlgorithm = undefined!;\n  controller._strategySizeAlgorithm = undefined!;\n}\n\nfunction WritableStreamDefaultControllerClose<W>(controller: WritableStreamDefaultController<W>) {\n  EnqueueValueWithSize(controller, closeSentinel, 0);\n  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\nfunction WritableStreamDefaultControllerGetChunkSize<W>(controller: WritableStreamDefaultController<W>,\n                                                        chunk: W): number {\n  try {\n    return controller._strategySizeAlgorithm(chunk);\n  } catch (chunkSizeE) {\n    WritableStreamDefaultControllerErrorIfNeeded(controller, chunkSizeE);\n    return 1;\n  }\n}\n\nfunction WritableStreamDefaultControllerGetDesiredSize(controller: WritableStreamDefaultController<any>): number {\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\nfunction WritableStreamDefaultControllerWrite<W>(controller: WritableStreamDefaultController<W>,\n                                                 chunk: W,\n                                                 chunkSize: number) {\n  try {\n    EnqueueValueWithSize(controller, chunk, chunkSize);\n  } catch (enqueueE) {\n    WritableStreamDefaultControllerErrorIfNeeded(controller, enqueueE);\n    return;\n  }\n\n  const stream = controller._controlledWritableStream;\n  if (!WritableStreamCloseQueuedOrInFlight(stream) && stream._state === 'writable') {\n    const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n    WritableStreamUpdateBackpressure(stream, backpressure);\n  }\n\n  WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n}\n\n// Abstract operations for the WritableStreamDefaultController.\n\nfunction WritableStreamDefaultControllerAdvanceQueueIfNeeded<W>(controller: WritableStreamDefaultController<W>) {\n  const stream = controller._controlledWritableStream;\n\n  if (!controller._started) {\n    return;\n  }\n\n  if (stream._inFlightWriteRequest !== undefined) {\n    return;\n  }\n\n  const state = stream._state;\n  assert(state !== 'closed' && state !== 'errored');\n  if (state === 'erroring') {\n    WritableStreamFinishErroring(stream);\n    return;\n  }\n\n  if (controller._queue.length === 0) {\n    return;\n  }\n\n  const value = PeekQueueValue(controller);\n  if (value === closeSentinel) {\n    WritableStreamDefaultControllerProcessClose(controller);\n  } else {\n    WritableStreamDefaultControllerProcessWrite(controller, value);\n  }\n}\n\nfunction WritableStreamDefaultControllerErrorIfNeeded(controller: WritableStreamDefaultController<any>, error: any) {\n  if (controller._controlledWritableStream._state === 'writable') {\n    WritableStreamDefaultControllerError(controller, error);\n  }\n}\n\nfunction WritableStreamDefaultControllerProcessClose(controller: WritableStreamDefaultController<any>) {\n  const stream = controller._controlledWritableStream;\n\n  WritableStreamMarkCloseRequestInFlight(stream);\n\n  DequeueValue(controller);\n  assert(controller._queue.length === 0);\n\n  const sinkClosePromise = controller._closeAlgorithm();\n  WritableStreamDefaultControllerClearAlgorithms(controller);\n  uponPromise(\n    sinkClosePromise,\n    () => {\n      WritableStreamFinishInFlightClose(stream);\n    },\n    reason => {\n      WritableStreamFinishInFlightCloseWithError(stream, reason);\n    }\n  );\n}\n\nfunction WritableStreamDefaultControllerProcessWrite<W>(controller: WritableStreamDefaultController<W>, chunk: W) {\n  const stream = controller._controlledWritableStream;\n\n  WritableStreamMarkFirstWriteRequestInFlight(stream);\n\n  const sinkWritePromise = controller._writeAlgorithm(chunk);\n  uponPromise(\n    sinkWritePromise,\n    () => {\n      WritableStreamFinishInFlightWrite(stream);\n\n      const state = stream._state;\n      assert(state === 'writable' || state === 'erroring');\n\n      DequeueValue(controller);\n\n      if (!WritableStreamCloseQueuedOrInFlight(stream) && state === 'writable') {\n        const backpressure = WritableStreamDefaultControllerGetBackpressure(controller);\n        WritableStreamUpdateBackpressure(stream, backpressure);\n      }\n\n      WritableStreamDefaultControllerAdvanceQueueIfNeeded(controller);\n    },\n    reason => {\n      if (stream._state === 'writable') {\n        WritableStreamDefaultControllerClearAlgorithms(controller);\n      }\n      WritableStreamFinishInFlightWriteWithError(stream, reason);\n    }\n  );\n}\n\nfunction WritableStreamDefaultControllerGetBackpressure(controller: WritableStreamDefaultController<any>): boolean {\n  const desiredSize = WritableStreamDefaultControllerGetDesiredSize(controller);\n  return desiredSize <= 0;\n}\n\n// A client of WritableStreamDefaultController may use these functions directly to bypass state check.\n\nfunction WritableStreamDefaultControllerError(controller: WritableStreamDefaultController<any>, error: any) {\n  const stream = controller._controlledWritableStream;\n\n  assert(stream._state === 'writable');\n\n  WritableStreamDefaultControllerClearAlgorithms(controller);\n  WritableStreamStartErroring(stream, error);\n}\n\n// Helper functions for the WritableStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(`WritableStream.prototype.${name} can only be used on a WritableStream`);\n}\n\n// Helper functions for the WritableStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `WritableStreamDefaultController.prototype.${name} can only be used on a WritableStreamDefaultController`);\n}\n\n\n// Helper functions for the WritableStreamDefaultWriter.\n\nfunction defaultWriterBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `WritableStreamDefaultWriter.prototype.${name} can only be used on a WritableStreamDefaultWriter`);\n}\n\nfunction defaultWriterLockException(name: string): TypeError {\n  return new TypeError('Cannot ' + name + ' a stream using a released writer');\n}\n\nfunction defaultWriterClosedPromiseInitialize(writer: WritableStreamDefaultWriter) {\n  writer._closedPromise = newPromise((resolve, reject) => {\n    writer._closedPromise_resolve = resolve;\n    writer._closedPromise_reject = reject;\n    writer._closedPromiseState = 'pending';\n  });\n}\n\nfunction defaultWriterClosedPromiseInitializeAsRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  defaultWriterClosedPromiseInitialize(writer);\n  defaultWriterClosedPromiseReject(writer, reason);\n}\n\nfunction defaultWriterClosedPromiseInitializeAsResolved(writer: WritableStreamDefaultWriter) {\n  defaultWriterClosedPromiseInitialize(writer);\n  defaultWriterClosedPromiseResolve(writer);\n}\n\nfunction defaultWriterClosedPromiseReject(writer: WritableStreamDefaultWriter, reason: any) {\n  if (writer._closedPromise_reject === undefined) {\n    return;\n  }\n  assert(writer._closedPromiseState === 'pending');\n\n  setPromiseIsHandledToTrue(writer._closedPromise);\n  writer._closedPromise_reject(reason);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'rejected';\n}\n\nfunction defaultWriterClosedPromiseResetToRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  assert(writer._closedPromise_resolve === undefined);\n  assert(writer._closedPromise_reject === undefined);\n  assert(writer._closedPromiseState !== 'pending');\n\n  defaultWriterClosedPromiseInitializeAsRejected(writer, reason);\n}\n\nfunction defaultWriterClosedPromiseResolve(writer: WritableStreamDefaultWriter) {\n  if (writer._closedPromise_resolve === undefined) {\n    return;\n  }\n  assert(writer._closedPromiseState === 'pending');\n\n  writer._closedPromise_resolve(undefined);\n  writer._closedPromise_resolve = undefined;\n  writer._closedPromise_reject = undefined;\n  writer._closedPromiseState = 'resolved';\n}\n\nfunction defaultWriterReadyPromiseInitialize(writer: WritableStreamDefaultWriter) {\n  writer._readyPromise = newPromise((resolve, reject) => {\n    writer._readyPromise_resolve = resolve;\n    writer._readyPromise_reject = reject;\n  });\n  writer._readyPromiseState = 'pending';\n}\n\nfunction defaultWriterReadyPromiseInitializeAsRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  defaultWriterReadyPromiseInitialize(writer);\n  defaultWriterReadyPromiseReject(writer, reason);\n}\n\nfunction defaultWriterReadyPromiseInitializeAsResolved(writer: WritableStreamDefaultWriter) {\n  defaultWriterReadyPromiseInitialize(writer);\n  defaultWriterReadyPromiseResolve(writer);\n}\n\nfunction defaultWriterReadyPromiseReject(writer: WritableStreamDefaultWriter, reason: any) {\n  if (writer._readyPromise_reject === undefined) {\n    return;\n  }\n\n  setPromiseIsHandledToTrue(writer._readyPromise);\n  writer._readyPromise_reject(reason);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'rejected';\n}\n\nfunction defaultWriterReadyPromiseReset(writer: WritableStreamDefaultWriter) {\n  assert(writer._readyPromise_resolve === undefined);\n  assert(writer._readyPromise_reject === undefined);\n\n  defaultWriterReadyPromiseInitialize(writer);\n}\n\nfunction defaultWriterReadyPromiseResetToRejected(writer: WritableStreamDefaultWriter, reason: any) {\n  assert(writer._readyPromise_resolve === undefined);\n  assert(writer._readyPromise_reject === undefined);\n\n  defaultWriterReadyPromiseInitializeAsRejected(writer, reason);\n}\n\nfunction defaultWriterReadyPromiseResolve(writer: WritableStreamDefaultWriter) {\n  if (writer._readyPromise_resolve === undefined) {\n    return;\n  }\n\n  writer._readyPromise_resolve(undefined);\n  writer._readyPromise_resolve = undefined;\n  writer._readyPromise_reject = undefined;\n  writer._readyPromiseState = 'fulfilled';\n}\n","/// <reference lib=\"dom\" />\nexport const NativeDOMException: typeof DOMException | undefined =\n  typeof DOMException !== 'undefined' ? DOMException : undefined;\n","/// <reference types=\"node\" />\nimport { NativeDOMException } from './native';\n\ndeclare class DOMExceptionClass extends Error {\n  constructor(message?: string, name?: string);\n\n  name: string;\n  message: string;\n}\n\ntype DOMException = DOMExceptionClass;\ntype DOMExceptionConstructor = typeof DOMExceptionClass;\n\nfunction isDOMExceptionConstructor(ctor: unknown): ctor is DOMExceptionConstructor {\n  if (!(typeof ctor === 'function' || typeof ctor === 'object')) {\n    return false;\n  }\n  try {\n    new (ctor as DOMExceptionConstructor)();\n    return true;\n  } catch {\n    return false;\n  }\n}\n\nfunction createDOMExceptionPolyfill(): DOMExceptionConstructor {\n  // eslint-disable-next-line no-shadow\n  const ctor = function DOMException(this: DOMException, message?: string, name?: string) {\n    this.message = message || '';\n    this.name = name || 'Error';\n    if (Error.captureStackTrace) {\n      Error.captureStackTrace(this, this.constructor);\n    }\n  } as any;\n  ctor.prototype = Object.create(Error.prototype);\n  Object.defineProperty(ctor.prototype, 'constructor', { value: ctor, writable: true, configurable: true });\n  return ctor;\n}\n\n// eslint-disable-next-line no-redeclare\nconst DOMException: DOMExceptionConstructor =\n  isDOMExceptionConstructor(NativeDOMException) ? NativeDOMException : createDOMExceptionPolyfill();\n\nexport { DOMException };\n","import { IsReadableStream, IsReadableStreamLocked, ReadableStream, ReadableStreamCancel } from '../readable-stream';\nimport { AcquireReadableStreamDefaultReader, ReadableStreamDefaultReaderRead } from './default-reader';\nimport { ReadableStreamReaderGenericRelease } from './generic-reader';\nimport {\n  AcquireWritableStreamDefaultWriter,\n  IsWritableStream,\n  IsWritableStreamLocked,\n  WritableStream,\n  WritableStreamAbort,\n  WritableStreamCloseQueuedOrInFlight,\n  WritableStreamDefaultWriterCloseWithErrorPropagation,\n  WritableStreamDefaultWriterRelease,\n  WritableStreamDefaultWriterWrite\n} from '../writable-stream';\nimport assert from '../../stub/assert';\nimport {\n  newPromise,\n  PerformPromiseThen,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  uponFulfillment,\n  uponPromise,\n  uponRejection\n} from '../helpers/webidl';\nimport { noop } from '../../utils';\nimport { AbortSignal, isAbortSignal } from '../abort-signal';\nimport { DOMException } from '../../stub/dom-exception';\n\nexport function ReadableStreamPipeTo<T>(source: ReadableStream<T>,\n                                        dest: WritableStream<T>,\n                                        preventClose: boolean,\n                                        preventAbort: boolean,\n                                        preventCancel: boolean,\n                                        signal: AbortSignal | undefined): Promise<undefined> {\n  assert(IsReadableStream(source));\n  assert(IsWritableStream(dest));\n  assert(typeof preventClose === 'boolean');\n  assert(typeof preventAbort === 'boolean');\n  assert(typeof preventCancel === 'boolean');\n  assert(signal === undefined || isAbortSignal(signal));\n  assert(!IsReadableStreamLocked(source));\n  assert(!IsWritableStreamLocked(dest));\n\n  const reader = AcquireReadableStreamDefaultReader<T>(source);\n  const writer = AcquireWritableStreamDefaultWriter<T>(dest);\n\n  source._disturbed = true;\n\n  let shuttingDown = false;\n\n  // This is used to keep track of the spec's requirement that we wait for ongoing writes during shutdown.\n  let currentWrite = promiseResolvedWith<void>(undefined);\n\n  return newPromise((resolve, reject) => {\n    let abortAlgorithm: () => void;\n    if (signal !== undefined) {\n      abortAlgorithm = () => {\n        const error = new DOMException('Aborted', 'AbortError');\n        const actions: Array<() => Promise<void>> = [];\n        if (!preventAbort) {\n          actions.push(() => {\n            if (dest._state === 'writable') {\n              return WritableStreamAbort(dest, error);\n            }\n            return promiseResolvedWith(undefined);\n          });\n        }\n        if (!preventCancel) {\n          actions.push(() => {\n            if (source._state === 'readable') {\n              return ReadableStreamCancel(source, error);\n            }\n            return promiseResolvedWith(undefined);\n          });\n        }\n        shutdownWithAction(() => Promise.all(actions.map(action => action())), true, error);\n      };\n\n      if (signal.aborted) {\n        abortAlgorithm();\n        return;\n      }\n\n      signal.addEventListener('abort', abortAlgorithm);\n    }\n\n    // Using reader and writer, read all chunks from this and write them to dest\n    // - Backpressure must be enforced\n    // - Shutdown must stop all activity\n    function pipeLoop() {\n      return newPromise<void>((resolveLoop, rejectLoop) => {\n        function next(done: boolean) {\n          if (done) {\n            resolveLoop();\n          } else {\n            // Use `PerformPromiseThen` instead of `uponPromise` to avoid\n            // adding unnecessary `.catch(rethrowAssertionErrorRejection)` handlers\n            PerformPromiseThen(pipeStep(), next, rejectLoop);\n          }\n        }\n\n        next(false);\n      });\n    }\n\n    function pipeStep(): Promise<boolean> {\n      if (shuttingDown) {\n        return promiseResolvedWith(true);\n      }\n\n      return PerformPromiseThen(writer._readyPromise, () => {\n        return newPromise<boolean>((resolveRead, rejectRead) => {\n          ReadableStreamDefaultReaderRead(\n            reader,\n            {\n              _chunkSteps: chunk => {\n                currentWrite = PerformPromiseThen(WritableStreamDefaultWriterWrite(writer, chunk), undefined, noop);\n                resolveRead(false);\n              },\n              _closeSteps: () => resolveRead(true),\n              _errorSteps: rejectRead\n            }\n          );\n        });\n      });\n    }\n\n    // Errors must be propagated forward\n    isOrBecomesErrored(source, reader._closedPromise, storedError => {\n      if (!preventAbort) {\n        shutdownWithAction(() => WritableStreamAbort(dest, storedError), true, storedError);\n      } else {\n        shutdown(true, storedError);\n      }\n    });\n\n    // Errors must be propagated backward\n    isOrBecomesErrored(dest, writer._closedPromise, storedError => {\n      if (!preventCancel) {\n        shutdownWithAction(() => ReadableStreamCancel(source, storedError), true, storedError);\n      } else {\n        shutdown(true, storedError);\n      }\n    });\n\n    // Closing must be propagated forward\n    isOrBecomesClosed(source, reader._closedPromise, () => {\n      if (!preventClose) {\n        shutdownWithAction(() => WritableStreamDefaultWriterCloseWithErrorPropagation(writer));\n      } else {\n        shutdown();\n      }\n    });\n\n    // Closing must be propagated backward\n    if (WritableStreamCloseQueuedOrInFlight(dest) || dest._state === 'closed') {\n      const destClosed = new TypeError('the destination writable stream closed before all data could be piped to it');\n\n      if (!preventCancel) {\n        shutdownWithAction(() => ReadableStreamCancel(source, destClosed), true, destClosed);\n      } else {\n        shutdown(true, destClosed);\n      }\n    }\n\n    setPromiseIsHandledToTrue(pipeLoop());\n\n    function waitForWritesToFinish(): Promise<void> {\n      // Another write may have started while we were waiting on this currentWrite, so we have to be sure to wait\n      // for that too.\n      const oldCurrentWrite = currentWrite;\n      return PerformPromiseThen(\n        currentWrite,\n        () => oldCurrentWrite !== currentWrite ? waitForWritesToFinish() : undefined\n      );\n    }\n\n    function isOrBecomesErrored(stream: ReadableStream | WritableStream,\n                                promise: Promise<void>,\n                                action: (reason: any) => void) {\n      if (stream._state === 'errored') {\n        action(stream._storedError);\n      } else {\n        uponRejection(promise, action);\n      }\n    }\n\n    function isOrBecomesClosed(stream: ReadableStream | WritableStream, promise: Promise<void>, action: () => void) {\n      if (stream._state === 'closed') {\n        action();\n      } else {\n        uponFulfillment(promise, action);\n      }\n    }\n\n    function shutdownWithAction(action: () => Promise<unknown>, originalIsError?: boolean, originalError?: any) {\n      if (shuttingDown) {\n        return;\n      }\n      shuttingDown = true;\n\n      if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {\n        uponFulfillment(waitForWritesToFinish(), doTheRest);\n      } else {\n        doTheRest();\n      }\n\n      function doTheRest() {\n        uponPromise(\n          action(),\n          () => finalize(originalIsError, originalError),\n          newError => finalize(true, newError)\n        );\n      }\n    }\n\n    function shutdown(isError?: boolean, error?: any) {\n      if (shuttingDown) {\n        return;\n      }\n      shuttingDown = true;\n\n      if (dest._state === 'writable' && !WritableStreamCloseQueuedOrInFlight(dest)) {\n        uponFulfillment(waitForWritesToFinish(), () => finalize(isError, error));\n      } else {\n        finalize(isError, error);\n      }\n    }\n\n    function finalize(isError?: boolean, error?: any) {\n      WritableStreamDefaultWriterRelease(writer);\n      ReadableStreamReaderGenericRelease(reader);\n\n      if (signal !== undefined) {\n        signal.removeEventListener('abort', abortAlgorithm);\n      }\n      if (isError) {\n        reject(error);\n      } else {\n        resolve(undefined);\n      }\n    }\n  });\n}\n","import { QueuingStrategySizeCallback } from '../queuing-strategy';\nimport assert from '../../stub/assert';\nimport { DequeueValue, EnqueueValueWithSize, QueuePair, ResetQueue } from '../abstract-ops/queue-with-sizes';\nimport {\n  ReadableStreamAddReadRequest,\n  ReadableStreamFulfillReadRequest,\n  ReadableStreamGetNumReadRequests,\n  ReadRequest\n} from './default-reader';\nimport { SimpleQueue } from '../simple-queue';\nimport { IsReadableStreamLocked, ReadableStream, ReadableStreamClose, ReadableStreamError } from '../readable-stream';\nimport { ValidatedUnderlyingSource } from './underlying-source';\nimport { typeIsObject } from '../helpers/miscellaneous';\nimport { CancelSteps, PullSteps } from '../abstract-ops/internal-methods';\nimport { promiseResolvedWith, uponPromise } from '../helpers/webidl';\n\n/**\n * Allows control of a {@link ReadableStream | readable stream}'s state and internal queue.\n *\n * @public\n */\nexport class ReadableStreamDefaultController<R> {\n  /** @internal */\n  _controlledReadableStream!: ReadableStream<R>;\n  /** @internal */\n  _queue!: SimpleQueue<QueuePair<R>>;\n  /** @internal */\n  _queueTotalSize!: number;\n  /** @internal */\n  _started!: boolean;\n  /** @internal */\n  _closeRequested!: boolean;\n  /** @internal */\n  _pullAgain!: boolean;\n  /** @internal */\n  _pulling !: boolean;\n  /** @internal */\n  _strategySizeAlgorithm!: QueuingStrategySizeCallback<R>;\n  /** @internal */\n  _strategyHWM!: number;\n  /** @internal */\n  _pullAlgorithm!: () => Promise<void>;\n  /** @internal */\n  _cancelAlgorithm!: (reason: any) => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is\n   * over-full. An underlying source ought to use this information to determine when and how to apply backpressure.\n   */\n  get desiredSize(): number | null {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('desiredSize');\n    }\n\n    return ReadableStreamDefaultControllerGetDesiredSize(this);\n  }\n\n  /**\n   * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from\n   * the stream, but once those are read, the stream will become closed.\n   */\n  close(): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('close');\n    }\n\n    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {\n      throw new TypeError('The stream is not in a state that permits close');\n    }\n\n    ReadableStreamDefaultControllerClose(this);\n  }\n\n  /**\n   * Enqueues the given chunk `chunk` in the controlled readable stream.\n   */\n  enqueue(chunk: R): void;\n  enqueue(chunk: R = undefined!): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('enqueue');\n    }\n\n    if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(this)) {\n      throw new TypeError('The stream is not in a state that permits enqueue');\n    }\n\n    return ReadableStreamDefaultControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.\n   */\n  error(e: any = undefined): void {\n    if (!IsReadableStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n\n    ReadableStreamDefaultControllerError(this, e);\n  }\n\n  /** @internal */\n  [CancelSteps](reason: any): Promise<void> {\n    ResetQueue(this);\n    const result = this._cancelAlgorithm(reason);\n    ReadableStreamDefaultControllerClearAlgorithms(this);\n    return result;\n  }\n\n  /** @internal */\n  [PullSteps](readRequest: ReadRequest<R>): void {\n    const stream = this._controlledReadableStream;\n\n    if (this._queue.length > 0) {\n      const chunk = DequeueValue(this);\n\n      if (this._closeRequested && this._queue.length === 0) {\n        ReadableStreamDefaultControllerClearAlgorithms(this);\n        ReadableStreamClose(stream);\n      } else {\n        ReadableStreamDefaultControllerCallPullIfNeeded(this);\n      }\n\n      readRequest._chunkSteps(chunk);\n    } else {\n      ReadableStreamAddReadRequest(stream, readRequest);\n      ReadableStreamDefaultControllerCallPullIfNeeded(this);\n    }\n  }\n}\n\nObject.defineProperties(ReadableStreamDefaultController.prototype, {\n  close: { enumerable: true },\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'ReadableStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Abstract operations for the ReadableStreamDefaultController.\n\nfunction IsReadableStreamDefaultController<R = any>(x: any): x is ReadableStreamDefaultController<R> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledReadableStream')) {\n    return false;\n  }\n\n  return x instanceof ReadableStreamDefaultController;\n}\n\nfunction ReadableStreamDefaultControllerCallPullIfNeeded(controller: ReadableStreamDefaultController<any>): void {\n  const shouldPull = ReadableStreamDefaultControllerShouldCallPull(controller);\n  if (!shouldPull) {\n    return;\n  }\n\n  if (controller._pulling) {\n    controller._pullAgain = true;\n    return;\n  }\n\n  assert(!controller._pullAgain);\n\n  controller._pulling = true;\n\n  const pullPromise = controller._pullAlgorithm();\n  uponPromise(\n    pullPromise,\n    () => {\n      controller._pulling = false;\n\n      if (controller._pullAgain) {\n        controller._pullAgain = false;\n        ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n      }\n    },\n    e => {\n      ReadableStreamDefaultControllerError(controller, e);\n    }\n  );\n}\n\nfunction ReadableStreamDefaultControllerShouldCallPull(controller: ReadableStreamDefaultController<any>): boolean {\n  const stream = controller._controlledReadableStream;\n\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return false;\n  }\n\n  if (!controller._started) {\n    return false;\n  }\n\n  if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    return true;\n  }\n\n  const desiredSize = ReadableStreamDefaultControllerGetDesiredSize(controller);\n  assert(desiredSize !== null);\n  if (desiredSize! > 0) {\n    return true;\n  }\n\n  return false;\n}\n\nfunction ReadableStreamDefaultControllerClearAlgorithms(controller: ReadableStreamDefaultController<any>) {\n  controller._pullAlgorithm = undefined!;\n  controller._cancelAlgorithm = undefined!;\n  controller._strategySizeAlgorithm = undefined!;\n}\n\n// A client of ReadableStreamDefaultController may use these functions directly to bypass state check.\n\nexport function ReadableStreamDefaultControllerClose(controller: ReadableStreamDefaultController<any>) {\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return;\n  }\n\n  const stream = controller._controlledReadableStream;\n\n  controller._closeRequested = true;\n\n  if (controller._queue.length === 0) {\n    ReadableStreamDefaultControllerClearAlgorithms(controller);\n    ReadableStreamClose(stream);\n  }\n}\n\nexport function ReadableStreamDefaultControllerEnqueue<R>(\n  controller: ReadableStreamDefaultController<R>,\n  chunk: R\n): void {\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(controller)) {\n    return;\n  }\n\n  const stream = controller._controlledReadableStream;\n\n  if (IsReadableStreamLocked(stream) && ReadableStreamGetNumReadRequests(stream) > 0) {\n    ReadableStreamFulfillReadRequest(stream, chunk, false);\n  } else {\n    let chunkSize;\n    try {\n      chunkSize = controller._strategySizeAlgorithm(chunk);\n    } catch (chunkSizeE) {\n      ReadableStreamDefaultControllerError(controller, chunkSizeE);\n      throw chunkSizeE;\n    }\n\n    try {\n      EnqueueValueWithSize(controller, chunk, chunkSize);\n    } catch (enqueueE) {\n      ReadableStreamDefaultControllerError(controller, enqueueE);\n      throw enqueueE;\n    }\n  }\n\n  ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n}\n\nexport function ReadableStreamDefaultControllerError(controller: ReadableStreamDefaultController<any>, e: any) {\n  const stream = controller._controlledReadableStream;\n\n  if (stream._state !== 'readable') {\n    return;\n  }\n\n  ResetQueue(controller);\n\n  ReadableStreamDefaultControllerClearAlgorithms(controller);\n  ReadableStreamError(stream, e);\n}\n\nexport function ReadableStreamDefaultControllerGetDesiredSize(\n  controller: ReadableStreamDefaultController<any>\n): number | null {\n  const state = controller._controlledReadableStream._state;\n\n  if (state === 'errored') {\n    return null;\n  }\n  if (state === 'closed') {\n    return 0;\n  }\n\n  return controller._strategyHWM - controller._queueTotalSize;\n}\n\n// This is used in the implementation of TransformStream.\nexport function ReadableStreamDefaultControllerHasBackpressure(\n  controller: ReadableStreamDefaultController<any>\n): boolean {\n  if (ReadableStreamDefaultControllerShouldCallPull(controller)) {\n    return false;\n  }\n\n  return true;\n}\n\nexport function ReadableStreamDefaultControllerCanCloseOrEnqueue(\n  controller: ReadableStreamDefaultController<any>\n): boolean {\n  const state = controller._controlledReadableStream._state;\n\n  if (!controller._closeRequested && state === 'readable') {\n    return true;\n  }\n\n  return false;\n}\n\nexport function SetUpReadableStreamDefaultController<R>(stream: ReadableStream<R>,\n                                                        controller: ReadableStreamDefaultController<R>,\n                                                        startAlgorithm: () => void | PromiseLike<void>,\n                                                        pullAlgorithm: () => Promise<void>,\n                                                        cancelAlgorithm: (reason: any) => Promise<void>,\n                                                        highWaterMark: number,\n                                                        sizeAlgorithm: QueuingStrategySizeCallback<R>) {\n  assert(stream._readableStreamController === undefined);\n\n  controller._controlledReadableStream = stream;\n\n  controller._queue = undefined!;\n  controller._queueTotalSize = undefined!;\n  ResetQueue(controller);\n\n  controller._started = false;\n  controller._closeRequested = false;\n  controller._pullAgain = false;\n  controller._pulling = false;\n\n  controller._strategySizeAlgorithm = sizeAlgorithm;\n  controller._strategyHWM = highWaterMark;\n\n  controller._pullAlgorithm = pullAlgorithm;\n  controller._cancelAlgorithm = cancelAlgorithm;\n\n  stream._readableStreamController = controller;\n\n  const startResult = startAlgorithm();\n  uponPromise(\n    promiseResolvedWith(startResult),\n    () => {\n      controller._started = true;\n\n      assert(!controller._pulling);\n      assert(!controller._pullAgain);\n\n      ReadableStreamDefaultControllerCallPullIfNeeded(controller);\n    },\n    r => {\n      ReadableStreamDefaultControllerError(controller, r);\n    }\n  );\n}\n\nexport function SetUpReadableStreamDefaultControllerFromUnderlyingSource<R>(\n  stream: ReadableStream<R>,\n  underlyingSource: ValidatedUnderlyingSource<R>,\n  highWaterMark: number,\n  sizeAlgorithm: QueuingStrategySizeCallback<R>\n) {\n  const controller: ReadableStreamDefaultController<R> = Object.create(ReadableStreamDefaultController.prototype);\n\n  let startAlgorithm: () => void | PromiseLike<void> = () => undefined;\n  let pullAlgorithm: () => Promise<void> = () => promiseResolvedWith(undefined);\n  let cancelAlgorithm: (reason: any) => Promise<void> = () => promiseResolvedWith(undefined);\n\n  if (underlyingSource.start !== undefined) {\n    startAlgorithm = () => underlyingSource.start!(controller);\n  }\n  if (underlyingSource.pull !== undefined) {\n    pullAlgorithm = () => underlyingSource.pull!(controller);\n  }\n  if (underlyingSource.cancel !== undefined) {\n    cancelAlgorithm = reason => underlyingSource.cancel!(reason);\n  }\n\n  SetUpReadableStreamDefaultController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm\n  );\n}\n\n// Helper functions for the ReadableStreamDefaultController.\n\nfunction defaultControllerBrandCheckException(name: string): TypeError {\n  return new TypeError(\n    `ReadableStreamDefaultController.prototype.${name} can only be used on a ReadableStreamDefaultController`);\n}\n","import {\n  CreateReadableByteStream,\n  CreateReadableStream,\n  IsReadableStream,\n  ReadableByteStream,\n  ReadableStream,\n  ReadableStreamCancel,\n  ReadableStreamReader\n} from '../readable-stream';\nimport { ReadableStreamReaderGenericRelease } from './generic-reader';\nimport {\n  AcquireReadableStreamDefaultReader,\n  IsReadableStreamDefaultReader,\n  ReadableStreamDefaultReaderRead,\n  ReadRequest\n} from './default-reader';\nimport {\n  AcquireReadableStreamBYOBReader,\n  IsReadableStreamBYOBReader,\n  ReadableStreamBYOBReaderRead,\n  ReadIntoRequest\n} from './byob-reader';\nimport assert from '../../stub/assert';\nimport { newPromise, promiseResolvedWith, queueMicrotask, uponRejection } from '../helpers/webidl';\nimport {\n  ReadableStreamDefaultController,\n  ReadableStreamDefaultControllerClose,\n  ReadableStreamDefaultControllerEnqueue,\n  ReadableStreamDefaultControllerError\n} from './default-controller';\nimport {\n  IsReadableByteStreamController,\n  ReadableByteStreamControllerClose,\n  ReadableByteStreamControllerEnqueue,\n  ReadableByteStreamControllerError,\n  ReadableByteStreamControllerGetBYOBRequest,\n  ReadableByteStreamControllerRespond,\n  ReadableByteStreamControllerRespondWithNewView\n} from './byte-stream-controller';\nimport { CreateArrayFromList } from '../abstract-ops/ecmascript';\nimport { CloneAsUint8Array } from '../abstract-ops/miscellaneous';\n\nexport function ReadableStreamTee<R>(stream: ReadableStream<R>,\n                                     cloneForBranch2: boolean): [ReadableStream<R>, ReadableStream<R>] {\n  assert(IsReadableStream(stream));\n  assert(typeof cloneForBranch2 === 'boolean');\n  if (IsReadableByteStreamController(stream._readableStreamController)) {\n    return ReadableByteStreamTee(stream as unknown as ReadableByteStream) as\n      unknown as [ReadableStream<R>, ReadableStream<R>];\n  }\n  return ReadableStreamDefaultTee(stream, cloneForBranch2);\n}\n\nexport function ReadableStreamDefaultTee<R>(stream: ReadableStream<R>,\n                                            cloneForBranch2: boolean): [ReadableStream<R>, ReadableStream<R>] {\n  assert(IsReadableStream(stream));\n  assert(typeof cloneForBranch2 === 'boolean');\n\n  const reader = AcquireReadableStreamDefaultReader<R>(stream);\n\n  let reading = false;\n  let readAgain = false;\n  let canceled1 = false;\n  let canceled2 = false;\n  let reason1: any;\n  let reason2: any;\n  let branch1: ReadableStream<R>;\n  let branch2: ReadableStream<R>;\n\n  let resolveCancelPromise: (value: undefined | Promise<undefined>) => void;\n  const cancelPromise = newPromise<undefined>(resolve => {\n    resolveCancelPromise = resolve;\n  });\n\n  function pullAlgorithm(): Promise<void> {\n    if (reading) {\n      readAgain = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const readRequest: ReadRequest<R> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgain = false;\n          const chunk1 = chunk;\n          const chunk2 = chunk;\n\n          // There is no way to access the cloning code right now in the reference implementation.\n          // If we add one then we'll need an implementation for serializable objects.\n          // if (!canceled2 && cloneForBranch2) {\n          //   chunk2 = StructuredDeserialize(StructuredSerialize(chunk2));\n          // }\n\n          if (!canceled1) {\n            ReadableStreamDefaultControllerEnqueue(\n              branch1._readableStreamController as ReadableStreamDefaultController<R>,\n              chunk1\n            );\n          }\n          if (!canceled2) {\n            ReadableStreamDefaultControllerEnqueue(\n              branch2._readableStreamController as ReadableStreamDefaultController<R>,\n              chunk2\n            );\n          }\n\n          reading = false;\n          if (readAgain) {\n            pullAlgorithm();\n          }\n        });\n      },\n      _closeSteps: () => {\n        reading = false;\n        if (!canceled1) {\n          ReadableStreamDefaultControllerClose(branch1._readableStreamController as ReadableStreamDefaultController<R>);\n        }\n        if (!canceled2) {\n          ReadableStreamDefaultControllerClose(branch2._readableStreamController as ReadableStreamDefaultController<R>);\n        }\n\n        if (!canceled1 || !canceled2) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function cancel1Algorithm(reason: any): Promise<void> {\n    canceled1 = true;\n    reason1 = reason;\n    if (canceled2) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function cancel2Algorithm(reason: any): Promise<void> {\n    canceled2 = true;\n    reason2 = reason;\n    if (canceled1) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function startAlgorithm() {\n    // do nothing\n  }\n\n  branch1 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel1Algorithm);\n  branch2 = CreateReadableStream(startAlgorithm, pullAlgorithm, cancel2Algorithm);\n\n  uponRejection(reader._closedPromise, (r: any) => {\n    ReadableStreamDefaultControllerError(branch1._readableStreamController as ReadableStreamDefaultController<R>, r);\n    ReadableStreamDefaultControllerError(branch2._readableStreamController as ReadableStreamDefaultController<R>, r);\n    if (!canceled1 || !canceled2) {\n      resolveCancelPromise(undefined);\n    }\n  });\n\n  return [branch1, branch2];\n}\n\nexport function ReadableByteStreamTee(stream: ReadableByteStream): [ReadableByteStream, ReadableByteStream] {\n  assert(IsReadableStream(stream));\n  assert(IsReadableByteStreamController(stream._readableStreamController));\n\n  let reader: ReadableStreamReader<Uint8Array> = AcquireReadableStreamDefaultReader(stream);\n  let reading = false;\n  let readAgainForBranch1 = false;\n  let readAgainForBranch2 = false;\n  let canceled1 = false;\n  let canceled2 = false;\n  let reason1: any;\n  let reason2: any;\n  let branch1: ReadableByteStream;\n  let branch2: ReadableByteStream;\n\n  let resolveCancelPromise: (value: undefined | Promise<undefined>) => void;\n  const cancelPromise = newPromise<void>(resolve => {\n    resolveCancelPromise = resolve;\n  });\n\n  function forwardReaderError(thisReader: ReadableStreamReader<Uint8Array>) {\n    uponRejection(thisReader._closedPromise, r => {\n      if (thisReader !== reader) {\n        return;\n      }\n      ReadableByteStreamControllerError(branch1._readableStreamController, r);\n      ReadableByteStreamControllerError(branch2._readableStreamController, r);\n      if (!canceled1 || !canceled2) {\n        resolveCancelPromise(undefined);\n      }\n    });\n  }\n\n  function pullWithDefaultReader() {\n    if (IsReadableStreamBYOBReader(reader)) {\n      assert(reader._readIntoRequests.length === 0);\n      ReadableStreamReaderGenericRelease(reader);\n\n      reader = AcquireReadableStreamDefaultReader(stream);\n      forwardReaderError(reader);\n    }\n\n    const readRequest: ReadRequest<Uint8Array> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgainForBranch1 = false;\n          readAgainForBranch2 = false;\n\n          const chunk1 = chunk;\n          let chunk2 = chunk;\n          if (!canceled1 && !canceled2) {\n            try {\n              chunk2 = CloneAsUint8Array(chunk);\n            } catch (cloneE) {\n              ReadableByteStreamControllerError(branch1._readableStreamController, cloneE);\n              ReadableByteStreamControllerError(branch2._readableStreamController, cloneE);\n              resolveCancelPromise(ReadableStreamCancel(stream, cloneE));\n              return;\n            }\n          }\n\n          if (!canceled1) {\n            ReadableByteStreamControllerEnqueue(branch1._readableStreamController, chunk1);\n          }\n          if (!canceled2) {\n            ReadableByteStreamControllerEnqueue(branch2._readableStreamController, chunk2);\n          }\n\n          reading = false;\n          if (readAgainForBranch1) {\n            pull1Algorithm();\n          } else if (readAgainForBranch2) {\n            pull2Algorithm();\n          }\n        });\n      },\n      _closeSteps: () => {\n        reading = false;\n        if (!canceled1) {\n          ReadableByteStreamControllerClose(branch1._readableStreamController);\n        }\n        if (!canceled2) {\n          ReadableByteStreamControllerClose(branch2._readableStreamController);\n        }\n        if (branch1._readableStreamController._pendingPullIntos.length > 0) {\n          ReadableByteStreamControllerRespond(branch1._readableStreamController, 0);\n        }\n        if (branch2._readableStreamController._pendingPullIntos.length > 0) {\n          ReadableByteStreamControllerRespond(branch2._readableStreamController, 0);\n        }\n        if (!canceled1 || !canceled2) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamDefaultReaderRead(reader, readRequest);\n  }\n\n  function pullWithBYOBReader(view: ArrayBufferView, forBranch2: boolean) {\n    if (IsReadableStreamDefaultReader<Uint8Array>(reader)) {\n      assert(reader._readRequests.length === 0);\n      ReadableStreamReaderGenericRelease(reader);\n\n      reader = AcquireReadableStreamBYOBReader(stream);\n      forwardReaderError(reader);\n    }\n\n    const byobBranch = forBranch2 ? branch2 : branch1;\n    const otherBranch = forBranch2 ? branch1 : branch2;\n\n    const readIntoRequest: ReadIntoRequest<ArrayBufferView> = {\n      _chunkSteps: chunk => {\n        // This needs to be delayed a microtask because it takes at least a microtask to detect errors (using\n        // reader._closedPromise below), and we want errors in stream to error both branches immediately. We cannot let\n        // successful synchronously-available reads get ahead of asynchronously-available errors.\n        queueMicrotask(() => {\n          readAgainForBranch1 = false;\n          readAgainForBranch2 = false;\n\n          const byobCanceled = forBranch2 ? canceled2 : canceled1;\n          const otherCanceled = forBranch2 ? canceled1 : canceled2;\n\n          if (!otherCanceled) {\n            let clonedChunk;\n            try {\n              clonedChunk = CloneAsUint8Array(chunk);\n            } catch (cloneE) {\n              ReadableByteStreamControllerError(byobBranch._readableStreamController, cloneE);\n              ReadableByteStreamControllerError(otherBranch._readableStreamController, cloneE);\n              resolveCancelPromise(ReadableStreamCancel(stream, cloneE));\n              return;\n            }\n            if (!byobCanceled) {\n              ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n            }\n            ReadableByteStreamControllerEnqueue(otherBranch._readableStreamController, clonedChunk);\n          } else if (!byobCanceled) {\n            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n          }\n\n          reading = false;\n          if (readAgainForBranch1) {\n            pull1Algorithm();\n          } else if (readAgainForBranch2) {\n            pull2Algorithm();\n          }\n        });\n      },\n      _closeSteps: chunk => {\n        reading = false;\n\n        const byobCanceled = forBranch2 ? canceled2 : canceled1;\n        const otherCanceled = forBranch2 ? canceled1 : canceled2;\n\n        if (!byobCanceled) {\n          ReadableByteStreamControllerClose(byobBranch._readableStreamController);\n        }\n        if (!otherCanceled) {\n          ReadableByteStreamControllerClose(otherBranch._readableStreamController);\n        }\n\n        if (chunk !== undefined) {\n          assert(chunk.byteLength === 0);\n\n          if (!byobCanceled) {\n            ReadableByteStreamControllerRespondWithNewView(byobBranch._readableStreamController, chunk);\n          }\n          if (!otherCanceled && otherBranch._readableStreamController._pendingPullIntos.length > 0) {\n            ReadableByteStreamControllerRespond(otherBranch._readableStreamController, 0);\n          }\n        }\n\n        if (!byobCanceled || !otherCanceled) {\n          resolveCancelPromise(undefined);\n        }\n      },\n      _errorSteps: () => {\n        reading = false;\n      }\n    };\n    ReadableStreamBYOBReaderRead(reader, view, readIntoRequest);\n  }\n\n  function pull1Algorithm(): Promise<void> {\n    if (reading) {\n      readAgainForBranch1 = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch1._readableStreamController);\n    if (byobRequest === null) {\n      pullWithDefaultReader();\n    } else {\n      pullWithBYOBReader(byobRequest._view!, false);\n    }\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function pull2Algorithm(): Promise<void> {\n    if (reading) {\n      readAgainForBranch2 = true;\n      return promiseResolvedWith(undefined);\n    }\n\n    reading = true;\n\n    const byobRequest = ReadableByteStreamControllerGetBYOBRequest(branch2._readableStreamController);\n    if (byobRequest === null) {\n      pullWithDefaultReader();\n    } else {\n      pullWithBYOBReader(byobRequest._view!, true);\n    }\n\n    return promiseResolvedWith(undefined);\n  }\n\n  function cancel1Algorithm(reason: any): Promise<void> {\n    canceled1 = true;\n    reason1 = reason;\n    if (canceled2) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function cancel2Algorithm(reason: any): Promise<void> {\n    canceled2 = true;\n    reason2 = reason;\n    if (canceled1) {\n      const compositeReason = CreateArrayFromList([reason1, reason2]);\n      const cancelResult = ReadableStreamCancel(stream, compositeReason);\n      resolveCancelPromise(cancelResult);\n    }\n    return cancelPromise;\n  }\n\n  function startAlgorithm(): void {\n    return;\n  }\n\n  branch1 = CreateReadableByteStream(startAlgorithm, pull1Algorithm, cancel1Algorithm);\n  branch2 = CreateReadableByteStream(startAlgorithm, pull2Algorithm, cancel2Algorithm);\n\n  forwardReaderError(reader);\n\n  return [branch1, branch2];\n}\n","import { assertDictionary, assertFunction, convertUnsignedLongLongWithEnforceRange } from './basic';\nimport {\n  ReadableStreamController,\n  UnderlyingByteSource,\n  UnderlyingDefaultOrByteSource,\n  UnderlyingDefaultOrByteSourcePullCallback,\n  UnderlyingDefaultOrByteSourceStartCallback,\n  UnderlyingSource,\n  UnderlyingSourceCancelCallback,\n  ValidatedUnderlyingDefaultOrByteSource\n} from '../readable-stream/underlying-source';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\n\nexport function convertUnderlyingDefaultOrByteSource<R>(\n  source: UnderlyingSource<R> | UnderlyingByteSource | null,\n  context: string\n): ValidatedUnderlyingDefaultOrByteSource<R> {\n  assertDictionary(source, context);\n  const original = source as (UnderlyingDefaultOrByteSource<R> | null);\n  const autoAllocateChunkSize = original?.autoAllocateChunkSize;\n  const cancel = original?.cancel;\n  const pull = original?.pull;\n  const start = original?.start;\n  const type = original?.type;\n  return {\n    autoAllocateChunkSize: autoAllocateChunkSize === undefined ?\n      undefined :\n      convertUnsignedLongLongWithEnforceRange(\n        autoAllocateChunkSize,\n        `${context} has member 'autoAllocateChunkSize' that`\n      ),\n    cancel: cancel === undefined ?\n      undefined :\n      convertUnderlyingSourceCancelCallback(cancel, original!, `${context} has member 'cancel' that`),\n    pull: pull === undefined ?\n      undefined :\n      convertUnderlyingSourcePullCallback(pull, original!, `${context} has member 'pull' that`),\n    start: start === undefined ?\n      undefined :\n      convertUnderlyingSourceStartCallback(start, original!, `${context} has member 'start' that`),\n    type: type === undefined ? undefined : convertReadableStreamType(type, `${context} has member 'type' that`)\n  };\n}\n\nfunction convertUnderlyingSourceCancelCallback(\n  fn: UnderlyingSourceCancelCallback,\n  original: UnderlyingDefaultOrByteSource,\n  context: string\n): (reason: any) => Promise<void> {\n  assertFunction(fn, context);\n  return (reason: any) => promiseCall(fn, original, [reason]);\n}\n\nfunction convertUnderlyingSourcePullCallback<R>(\n  fn: UnderlyingDefaultOrByteSourcePullCallback<R>,\n  original: UnderlyingDefaultOrByteSource<R>,\n  context: string\n): (controller: ReadableStreamController<R>) => Promise<void> {\n  assertFunction(fn, context);\n  return (controller: ReadableStreamController<R>) => promiseCall(fn, original, [controller]);\n}\n\nfunction convertUnderlyingSourceStartCallback<R>(\n  fn: UnderlyingDefaultOrByteSourceStartCallback<R>,\n  original: UnderlyingDefaultOrByteSource<R>,\n  context: string\n): UnderlyingDefaultOrByteSourceStartCallback<R> {\n  assertFunction(fn, context);\n  return (controller: ReadableStreamController<R>) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertReadableStreamType(type: string, context: string): 'bytes' {\n  type = `${type}`;\n  if (type !== 'bytes') {\n    throw new TypeError(`${context} '${type}' is not a valid enumeration value for ReadableStreamType`);\n  }\n  return type;\n}\n","import { assertDictionary } from './basic';\nimport { ReadableStreamGetReaderOptions } from '../readable-stream/reader-options';\n\nexport function convertReaderOptions(options: ReadableStreamGetReaderOptions | null | undefined,\n                                     context: string): ReadableStreamGetReaderOptions {\n  assertDictionary(options, context);\n  const mode = options?.mode;\n  return {\n    mode: mode === undefined ? undefined : convertReadableStreamReaderMode(mode, `${context} has member 'mode' that`)\n  };\n}\n\nfunction convertReadableStreamReaderMode(mode: string, context: string): 'byob' {\n  mode = `${mode}`;\n  if (mode !== 'byob') {\n    throw new TypeError(`${context} '${mode}' is not a valid enumeration value for ReadableStreamReaderMode`);\n  }\n  return mode;\n}\n","import { assertDictionary } from './basic';\nimport {\n  ReadableStreamIteratorOptions,\n  ValidatedReadableStreamIteratorOptions\n} from '../readable-stream/iterator-options';\n\nexport function convertIteratorOptions(options: ReadableStreamIteratorOptions | null | undefined,\n                                       context: string): ValidatedReadableStreamIteratorOptions {\n  assertDictionary(options, context);\n  const preventCancel = options?.preventCancel;\n  return { preventCancel: Boolean(preventCancel) };\n}\n","import { assertDictionary } from './basic';\nimport { StreamPipeOptions, ValidatedStreamPipeOptions } from '../readable-stream/pipe-options';\nimport { AbortSignal, isAbortSignal } from '../abort-signal';\n\nexport function convertPipeOptions(options: StreamPipeOptions | null | undefined,\n                                   context: string): ValidatedStreamPipeOptions {\n  assertDictionary(options, context);\n  const preventAbort = options?.preventAbort;\n  const preventCancel = options?.preventCancel;\n  const preventClose = options?.preventClose;\n  const signal = options?.signal;\n  if (signal !== undefined) {\n    assertAbortSignal(signal, `${context} has member 'signal' that`);\n  }\n  return {\n    preventAbort: Boolean(preventAbort),\n    preventCancel: Boolean(preventCancel),\n    preventClose: Boolean(preventClose),\n    signal\n  };\n}\n\nfunction assertAbortSignal(signal: unknown, context: string): asserts signal is AbortSignal {\n  if (!isAbortSignal(signal)) {\n    throw new TypeError(`${context} is not an AbortSignal.`);\n  }\n}\n","import { assertDictionary, assertRequiredField } from './basic';\nimport { ReadableStream } from '../readable-stream';\nimport { WritableStream } from '../writable-stream';\nimport { assertReadableStream } from './readable-stream';\nimport { assertWritableStream } from './writable-stream';\n\nexport function convertReadableWritablePair<RS extends ReadableStream, WS extends WritableStream>(\n  pair: { readable: RS; writable: WS } | null | undefined,\n  context: string\n): { readable: RS; writable: WS } {\n  assertDictionary(pair, context);\n\n  const readable = pair?.readable;\n  assertRequiredField(readable, 'readable', 'ReadableWritablePair');\n  assertReadableStream(readable, `${context} has member 'readable' that`);\n\n  const writable = pair?.writable;\n  assertRequiredField(writable, 'writable', 'ReadableWritablePair');\n  assertWritableStream(writable, `${context} has member 'writable' that`);\n\n  return { readable, writable };\n}\n","import assert from '../stub/assert';\nimport {\n  promiseRejectedWith,\n  promiseResolvedWith,\n  setPromiseIsHandledToTrue,\n  transformPromiseWith\n} from './helpers/webidl';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { AcquireReadableStreamAsyncIterator, ReadableStreamAsyncIterator } from './readable-stream/async-iterator';\nimport { defaultReaderClosedPromiseReject, defaultReaderClosedPromiseResolve } from './readable-stream/generic-reader';\nimport {\n  AcquireReadableStreamDefaultReader,\n  IsReadableStreamDefaultReader,\n  ReadableStreamDefaultReader,\n  ReadableStreamDefaultReadResult\n} from './readable-stream/default-reader';\nimport {\n  AcquireReadableStreamBYOBReader,\n  IsReadableStreamBYOBReader,\n  ReadableStreamBYOBReader,\n  ReadableStreamBYOBReadResult\n} from './readable-stream/byob-reader';\nimport { ReadableStreamPipeTo } from './readable-stream/pipe';\nimport { ReadableStreamTee } from './readable-stream/tee';\nimport { IsWritableStream, IsWritableStreamLocked, WritableStream } from './writable-stream';\nimport { SimpleQueue } from './simple-queue';\nimport {\n  ReadableByteStreamController,\n  ReadableStreamBYOBRequest,\n  SetUpReadableByteStreamController,\n  SetUpReadableByteStreamControllerFromUnderlyingSource\n} from './readable-stream/byte-stream-controller';\nimport {\n  ReadableStreamDefaultController,\n  SetUpReadableStreamDefaultController,\n  SetUpReadableStreamDefaultControllerFromUnderlyingSource\n} from './readable-stream/default-controller';\nimport {\n  UnderlyingByteSource,\n  UnderlyingByteSourcePullCallback,\n  UnderlyingByteSourceStartCallback,\n  UnderlyingSource,\n  UnderlyingSourceCancelCallback,\n  UnderlyingSourcePullCallback,\n  UnderlyingSourceStartCallback\n} from './readable-stream/underlying-source';\nimport { noop } from '../utils';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { CreateArrayFromList } from './abstract-ops/ecmascript';\nimport { CancelSteps } from './abstract-ops/internal-methods';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { assertObject, assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport { convertUnderlyingDefaultOrByteSource } from './validators/underlying-source';\nimport { ReadableStreamGetReaderOptions } from './readable-stream/reader-options';\nimport { convertReaderOptions } from './validators/reader-options';\nimport { StreamPipeOptions, ValidatedStreamPipeOptions } from './readable-stream/pipe-options';\nimport { ReadableStreamIteratorOptions } from './readable-stream/iterator-options';\nimport { convertIteratorOptions } from './validators/iterator-options';\nimport { convertPipeOptions } from './validators/pipe-options';\nimport { ReadableWritablePair } from './readable-stream/readable-writable-pair';\nimport { convertReadableWritablePair } from './validators/readable-writable-pair';\n\nexport type ReadableByteStream = ReadableStream<Uint8Array> & {\n  _readableStreamController: ReadableByteStreamController\n};\n\ntype ReadableStreamState = 'readable' | 'closed' | 'errored';\n\n/**\n * A readable stream represents a source of data, from which you can read.\n *\n * @public\n */\nexport class ReadableStream<R = any> {\n  /** @internal */\n  _state!: ReadableStreamState;\n  /** @internal */\n  _reader: ReadableStreamReader<R> | undefined;\n  /** @internal */\n  _storedError: any;\n  /** @internal */\n  _disturbed!: boolean;\n  /** @internal */\n  _readableStreamController!: ReadableStreamDefaultController<R> | ReadableByteStreamController;\n\n  constructor(underlyingSource: UnderlyingByteSource, strategy?: { highWaterMark?: number; size?: undefined });\n  constructor(underlyingSource?: UnderlyingSource<R>, strategy?: QueuingStrategy<R>);\n  constructor(rawUnderlyingSource: UnderlyingSource<R> | UnderlyingByteSource | null | undefined = {},\n              rawStrategy: QueuingStrategy<R> | null | undefined = {}) {\n    if (rawUnderlyingSource === undefined) {\n      rawUnderlyingSource = null;\n    } else {\n      assertObject(rawUnderlyingSource, 'First parameter');\n    }\n\n    const strategy = convertQueuingStrategy(rawStrategy, 'Second parameter');\n    const underlyingSource = convertUnderlyingDefaultOrByteSource(rawUnderlyingSource, 'First parameter');\n\n    InitializeReadableStream(this);\n\n    if (underlyingSource.type === 'bytes') {\n      if (strategy.size !== undefined) {\n        throw new RangeError('The strategy for a byte stream cannot have a size function');\n      }\n      const highWaterMark = ExtractHighWaterMark(strategy, 0);\n      SetUpReadableByteStreamControllerFromUnderlyingSource(\n        this as unknown as ReadableByteStream,\n        underlyingSource,\n        highWaterMark\n      );\n    } else {\n      assert(underlyingSource.type === undefined);\n      const sizeAlgorithm = ExtractSizeAlgorithm(strategy);\n      const highWaterMark = ExtractHighWaterMark(strategy, 1);\n      SetUpReadableStreamDefaultControllerFromUnderlyingSource(\n        this,\n        underlyingSource,\n        highWaterMark,\n        sizeAlgorithm\n      );\n    }\n  }\n\n  /**\n   * Whether or not the readable stream is locked to a {@link ReadableStreamDefaultReader | reader}.\n   */\n  get locked(): boolean {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('locked');\n    }\n\n    return IsReadableStreamLocked(this);\n  }\n\n  /**\n   * Cancels the stream, signaling a loss of interest in the stream by a consumer.\n   *\n   * The supplied `reason` argument will be given to the underlying source's {@link UnderlyingSource.cancel | cancel()}\n   * method, which might or might not use it.\n   */\n  cancel(reason: any = undefined): Promise<void> {\n    if (!IsReadableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('cancel'));\n    }\n\n    if (IsReadableStreamLocked(this)) {\n      return promiseRejectedWith(new TypeError('Cannot cancel a stream that already has a reader'));\n    }\n\n    return ReadableStreamCancel(this, reason);\n  }\n\n  /**\n   * Creates a {@link ReadableStreamBYOBReader} and locks the stream to the new reader.\n   *\n   * This call behaves the same way as the no-argument variant, except that it only works on readable byte streams,\n   * i.e. streams which were constructed specifically with the ability to handle \"bring your own buffer\" reading.\n   * The returned BYOB reader provides the ability to directly read individual chunks from the stream via its\n   * {@link ReadableStreamBYOBReader.read | read()} method, into developer-supplied buffers, allowing more precise\n   * control over allocation.\n   */\n  getReader({ mode }: { mode: 'byob' }): ReadableStreamBYOBReader;\n  /**\n   * Creates a {@link ReadableStreamDefaultReader} and locks the stream to the new reader.\n   * While the stream is locked, no other reader can be acquired until this one is released.\n   *\n   * This functionality is especially useful for creating abstractions that desire the ability to consume a stream\n   * in its entirety. By getting a reader for the stream, you can ensure nobody else can interleave reads with yours\n   * or cancel the stream, which would interfere with your abstraction.\n   */\n  getReader(): ReadableStreamDefaultReader<R>;\n  getReader(\n    rawOptions: ReadableStreamGetReaderOptions | null | undefined = undefined\n  ): ReadableStreamDefaultReader<R> | ReadableStreamBYOBReader {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('getReader');\n    }\n\n    const options = convertReaderOptions(rawOptions, 'First parameter');\n\n    if (options.mode === undefined) {\n      return AcquireReadableStreamDefaultReader(this);\n    }\n\n    assert(options.mode === 'byob');\n    return AcquireReadableStreamBYOBReader(this as unknown as ReadableByteStream);\n  }\n\n  /**\n   * Provides a convenient, chainable way of piping this readable stream through a transform stream\n   * (or any other `{ writable, readable }` pair). It simply {@link ReadableStream.pipeTo | pipes} the stream\n   * into the writable side of the supplied pair, and returns the readable side for further use.\n   *\n   * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.\n   */\n  pipeThrough<RS extends ReadableStream>(\n    transform: { readable: RS; writable: WritableStream<R> },\n    options?: StreamPipeOptions\n  ): RS;\n  pipeThrough<RS extends ReadableStream>(\n    rawTransform: { readable: RS; writable: WritableStream<R> } | null | undefined,\n    rawOptions: StreamPipeOptions | null | undefined = {}\n  ): RS {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('pipeThrough');\n    }\n    assertRequiredArgument(rawTransform, 1, 'pipeThrough');\n\n    const transform = convertReadableWritablePair(rawTransform, 'First parameter');\n    const options = convertPipeOptions(rawOptions, 'Second parameter');\n\n    if (IsReadableStreamLocked(this)) {\n      throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked ReadableStream');\n    }\n    if (IsWritableStreamLocked(transform.writable)) {\n      throw new TypeError('ReadableStream.prototype.pipeThrough cannot be used on a locked WritableStream');\n    }\n\n    const promise = ReadableStreamPipeTo(\n      this, transform.writable, options.preventClose, options.preventAbort, options.preventCancel, options.signal\n    );\n\n    setPromiseIsHandledToTrue(promise);\n\n    return transform.readable;\n  }\n\n  /**\n   * Pipes this readable stream to a given writable stream. The way in which the piping process behaves under\n   * various error conditions can be customized with a number of passed options. It returns a promise that fulfills\n   * when the piping process completes successfully, or rejects if any errors were encountered.\n   *\n   * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.\n   */\n  pipeTo(destination: WritableStream<R>, options?: StreamPipeOptions): Promise<void>;\n  pipeTo(destination: WritableStream<R> | null | undefined,\n         rawOptions: StreamPipeOptions | null | undefined = {}): Promise<void> {\n    if (!IsReadableStream(this)) {\n      return promiseRejectedWith(streamBrandCheckException('pipeTo'));\n    }\n\n    if (destination === undefined) {\n      return promiseRejectedWith(`Parameter 1 is required in 'pipeTo'.`);\n    }\n    if (!IsWritableStream(destination)) {\n      return promiseRejectedWith(\n        new TypeError(`ReadableStream.prototype.pipeTo's first argument must be a WritableStream`)\n      );\n    }\n\n    let options: ValidatedStreamPipeOptions;\n    try {\n      options = convertPipeOptions(rawOptions, 'Second parameter');\n    } catch (e) {\n      return promiseRejectedWith(e);\n    }\n\n    if (IsReadableStreamLocked(this)) {\n      return promiseRejectedWith(\n        new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked ReadableStream')\n      );\n    }\n    if (IsWritableStreamLocked(destination)) {\n      return promiseRejectedWith(\n        new TypeError('ReadableStream.prototype.pipeTo cannot be used on a locked WritableStream')\n      );\n    }\n\n    return ReadableStreamPipeTo<R>(\n      this, destination, options.preventClose, options.preventAbort, options.preventCancel, options.signal\n    );\n  }\n\n  /**\n   * Tees this readable stream, returning a two-element array containing the two resulting branches as\n   * new {@link ReadableStream} instances.\n   *\n   * Teeing a stream will lock it, preventing any other consumer from acquiring a reader.\n   * To cancel the stream, cancel both of the resulting branches; a composite cancellation reason will then be\n   * propagated to the stream's underlying source.\n   *\n   * Note that the chunks seen in each branch will be the same object. If the chunks are not immutable,\n   * this could allow interference between the two branches.\n   */\n  tee(): [ReadableStream<R>, ReadableStream<R>] {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('tee');\n    }\n\n    const branches = ReadableStreamTee(this, false);\n    return CreateArrayFromList(branches);\n  }\n\n  /**\n   * Asynchronously iterates over the chunks in the stream's internal queue.\n   *\n   * Asynchronously iterating over the stream will lock it, preventing any other consumer from acquiring a reader.\n   * The lock will be released if the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method\n   * is called, e.g. by breaking out of the loop.\n   *\n   * By default, calling the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method will also\n   * cancel the stream. To prevent this, use the stream's {@link ReadableStream.values | values()} method, passing\n   * `true` for the `preventCancel` option.\n   */\n  values(options?: ReadableStreamIteratorOptions): ReadableStreamAsyncIterator<R>;\n  values(rawOptions: ReadableStreamIteratorOptions | null | undefined = undefined): ReadableStreamAsyncIterator<R> {\n    if (!IsReadableStream(this)) {\n      throw streamBrandCheckException('values');\n    }\n\n    const options = convertIteratorOptions(rawOptions, 'First parameter');\n    return AcquireReadableStreamAsyncIterator<R>(this, options.preventCancel);\n  }\n\n  /**\n   * {@inheritDoc ReadableStream.values}\n   */\n  [Symbol.asyncIterator]: (options?: ReadableStreamIteratorOptions) => ReadableStreamAsyncIterator<R>;\n}\n\nObject.defineProperties(ReadableStream.prototype, {\n  cancel: { enumerable: true },\n  getReader: { enumerable: true },\n  pipeThrough: { enumerable: true },\n  pipeTo: { enumerable: true },\n  tee: { enumerable: true },\n  values: { enumerable: true },\n  locked: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ReadableStream.prototype, Symbol.toStringTag, {\n    value: 'ReadableStream',\n    configurable: true\n  });\n}\nif (typeof Symbol.asyncIterator === 'symbol') {\n  Object.defineProperty(ReadableStream.prototype, Symbol.asyncIterator, {\n    value: ReadableStream.prototype.values,\n    writable: true,\n    configurable: true\n  });\n}\n\nexport {\n  ReadableStreamAsyncIterator,\n  ReadableStreamDefaultReadResult,\n  ReadableStreamBYOBReadResult,\n  UnderlyingByteSource,\n  UnderlyingSource,\n  UnderlyingSourceStartCallback,\n  UnderlyingSourcePullCallback,\n  UnderlyingSourceCancelCallback,\n  UnderlyingByteSourceStartCallback,\n  UnderlyingByteSourcePullCallback,\n  StreamPipeOptions,\n  ReadableWritablePair,\n  ReadableStreamIteratorOptions\n};\n\n// Abstract operations for the ReadableStream.\n\n// Throws if and only if startAlgorithm throws.\nexport function CreateReadableStream<R>(startAlgorithm: () => void | PromiseLike<void>,\n                                        pullAlgorithm: () => Promise<void>,\n                                        cancelAlgorithm: (reason: any) => Promise<void>,\n                                        highWaterMark = 1,\n                                        sizeAlgorithm: QueuingStrategySizeCallback<R> = () => 1): ReadableStream<R> {\n  assert(IsNonNegativeNumber(highWaterMark));\n\n  const stream: ReadableStream<R> = Object.create(ReadableStream.prototype);\n  InitializeReadableStream(stream);\n\n  const controller: ReadableStreamDefaultController<R> = Object.create(ReadableStreamDefaultController.prototype);\n  SetUpReadableStreamDefaultController(\n    stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, highWaterMark, sizeAlgorithm\n  );\n\n  return stream;\n}\n\n// Throws if and only if startAlgorithm throws.\nexport function CreateReadableByteStream(\n  startAlgorithm: () => void | PromiseLike<void>,\n  pullAlgorithm: () => Promise<void>,\n  cancelAlgorithm: (reason: any) => Promise<void>\n): ReadableByteStream {\n  const stream: ReadableByteStream = Object.create(ReadableStream.prototype);\n  InitializeReadableStream(stream);\n\n  const controller: ReadableByteStreamController = Object.create(ReadableByteStreamController.prototype);\n  SetUpReadableByteStreamController(stream, controller, startAlgorithm, pullAlgorithm, cancelAlgorithm, 0, undefined);\n\n  return stream;\n}\n\nfunction InitializeReadableStream(stream: ReadableStream) {\n  stream._state = 'readable';\n  stream._reader = undefined;\n  stream._storedError = undefined;\n  stream._disturbed = false;\n}\n\nexport function IsReadableStream(x: unknown): x is ReadableStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_readableStreamController')) {\n    return false;\n  }\n\n  return x instanceof ReadableStream;\n}\n\nexport function IsReadableStreamDisturbed(stream: ReadableStream): boolean {\n  assert(IsReadableStream(stream));\n\n  return stream._disturbed;\n}\n\nexport function IsReadableStreamLocked(stream: ReadableStream): boolean {\n  assert(IsReadableStream(stream));\n\n  if (stream._reader === undefined) {\n    return false;\n  }\n\n  return true;\n}\n\n// ReadableStream API exposed for controllers.\n\nexport function ReadableStreamCancel<R>(stream: ReadableStream<R>, reason: any): Promise<undefined> {\n  stream._disturbed = true;\n\n  if (stream._state === 'closed') {\n    return promiseResolvedWith(undefined);\n  }\n  if (stream._state === 'errored') {\n    return promiseRejectedWith(stream._storedError);\n  }\n\n  ReadableStreamClose(stream);\n\n  const reader = stream._reader;\n  if (reader !== undefined && IsReadableStreamBYOBReader(reader)) {\n    reader._readIntoRequests.forEach(readIntoRequest => {\n      readIntoRequest._closeSteps(undefined);\n    });\n    reader._readIntoRequests = new SimpleQueue();\n  }\n\n  const sourceCancelPromise = stream._readableStreamController[CancelSteps](reason);\n  return transformPromiseWith(sourceCancelPromise, noop);\n}\n\nexport function ReadableStreamClose<R>(stream: ReadableStream<R>): void {\n  assert(stream._state === 'readable');\n\n  stream._state = 'closed';\n\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return;\n  }\n\n  defaultReaderClosedPromiseResolve(reader);\n\n  if (IsReadableStreamDefaultReader<R>(reader)) {\n    reader._readRequests.forEach(readRequest => {\n      readRequest._closeSteps();\n    });\n    reader._readRequests = new SimpleQueue();\n  }\n}\n\nexport function ReadableStreamError<R>(stream: ReadableStream<R>, e: any): void {\n  assert(IsReadableStream(stream));\n  assert(stream._state === 'readable');\n\n  stream._state = 'errored';\n  stream._storedError = e;\n\n  const reader = stream._reader;\n\n  if (reader === undefined) {\n    return;\n  }\n\n  defaultReaderClosedPromiseReject(reader, e);\n\n  if (IsReadableStreamDefaultReader<R>(reader)) {\n    reader._readRequests.forEach(readRequest => {\n      readRequest._errorSteps(e);\n    });\n\n    reader._readRequests = new SimpleQueue();\n  } else {\n    assert(IsReadableStreamBYOBReader(reader));\n\n    reader._readIntoRequests.forEach(readIntoRequest => {\n      readIntoRequest._errorSteps(e);\n    });\n\n    reader._readIntoRequests = new SimpleQueue();\n  }\n}\n\n// Readers\n\nexport type ReadableStreamReader<R> = ReadableStreamDefaultReader<R> | ReadableStreamBYOBReader;\n\nexport {\n  ReadableStreamDefaultReader,\n  ReadableStreamBYOBReader\n};\n\n// Controllers\n\nexport {\n  ReadableStreamDefaultController,\n  ReadableStreamBYOBRequest,\n  ReadableByteStreamController\n};\n\n// Helper functions for the ReadableStream.\n\nfunction streamBrandCheckException(name: string): TypeError {\n  return new TypeError(`ReadableStream.prototype.${name} can only be used on a ReadableStream`);\n}\n","import { QueuingStrategyInit } from '../queuing-strategy';\nimport { assertDictionary, assertRequiredField, convertUnrestrictedDouble } from './basic';\n\nexport function convertQueuingStrategyInit(init: QueuingStrategyInit | null | undefined,\n                                           context: string): QueuingStrategyInit {\n  assertDictionary(init, context);\n  const highWaterMark = init?.highWaterMark;\n  assertRequiredField(highWaterMark, 'highWaterMark', 'QueuingStrategyInit');\n  return {\n    highWaterMark: convertUnrestrictedDouble(highWaterMark)\n  };\n}\n","import { QueuingStrategy, QueuingStrategyInit } from './queuing-strategy';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategyInit } from './validators/queuing-strategy-init';\n\n// The size function must not have a prototype property nor be a constructor\nconst byteLengthSizeFunction = (chunk: ArrayBufferView): number => {\n  return chunk.byteLength;\n};\ntry {\n  Object.defineProperty(byteLengthSizeFunction, 'name', {\n    value: 'size',\n    configurable: true\n  });\n} catch {\n  // This property is non-configurable in older browsers, so ignore if this throws.\n  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility\n}\n\n/**\n * A queuing strategy that counts the number of bytes in each chunk.\n *\n * @public\n */\nexport default class ByteLengthQueuingStrategy implements QueuingStrategy<ArrayBufferView> {\n  /** @internal */\n  readonly _byteLengthQueuingStrategyHighWaterMark: number;\n\n  constructor(options: QueuingStrategyInit) {\n    assertRequiredArgument(options, 1, 'ByteLengthQueuingStrategy');\n    options = convertQueuingStrategyInit(options, 'First parameter');\n    this._byteLengthQueuingStrategyHighWaterMark = options.highWaterMark;\n  }\n\n  /**\n   * Returns the high water mark provided to the constructor.\n   */\n  get highWaterMark(): number {\n    if (!IsByteLengthQueuingStrategy(this)) {\n      throw byteLengthBrandCheckException('highWaterMark');\n    }\n    return this._byteLengthQueuingStrategyHighWaterMark;\n  }\n\n  /**\n   * Measures the size of `chunk` by returning the value of its `byteLength` property.\n   */\n  get size(): (chunk: ArrayBufferView) => number {\n    if (!IsByteLengthQueuingStrategy(this)) {\n      throw byteLengthBrandCheckException('size');\n    }\n    return byteLengthSizeFunction;\n  }\n}\n\nObject.defineProperties(ByteLengthQueuingStrategy.prototype, {\n  highWaterMark: { enumerable: true },\n  size: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(ByteLengthQueuingStrategy.prototype, Symbol.toStringTag, {\n    value: 'ByteLengthQueuingStrategy',\n    configurable: true\n  });\n}\n\n// Helper functions for the ByteLengthQueuingStrategy.\n\nfunction byteLengthBrandCheckException(name: string): TypeError {\n  return new TypeError(`ByteLengthQueuingStrategy.prototype.${name} can only be used on a ByteLengthQueuingStrategy`);\n}\n\nexport function IsByteLengthQueuingStrategy(x: any): x is ByteLengthQueuingStrategy {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_byteLengthQueuingStrategyHighWaterMark')) {\n    return false;\n  }\n\n  return x instanceof ByteLengthQueuingStrategy;\n}\n","import { QueuingStrategy, QueuingStrategyInit } from './queuing-strategy';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { assertRequiredArgument } from './validators/basic';\nimport { convertQueuingStrategyInit } from './validators/queuing-strategy-init';\n\n// The size function must not have a prototype property nor be a constructor\nconst countSizeFunction = (): 1 => {\n  return 1;\n};\ntry {\n  Object.defineProperty(countSizeFunction, 'name', {\n    value: 'size',\n    configurable: true\n  });\n} catch {\n  // This property is non-configurable in older browsers, so ignore if this throws.\n  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name#browser_compatibility\n}\n\n/**\n * A queuing strategy that counts the number of chunks.\n *\n * @public\n */\nexport default class CountQueuingStrategy implements QueuingStrategy<any> {\n  /** @internal */\n  readonly _countQueuingStrategyHighWaterMark!: number;\n\n  constructor(options: QueuingStrategyInit) {\n    assertRequiredArgument(options, 1, 'CountQueuingStrategy');\n    options = convertQueuingStrategyInit(options, 'First parameter');\n    this._countQueuingStrategyHighWaterMark = options.highWaterMark;\n  }\n\n  /**\n   * Returns the high water mark provided to the constructor.\n   */\n  get highWaterMark(): number {\n    if (!IsCountQueuingStrategy(this)) {\n      throw countBrandCheckException('highWaterMark');\n    }\n    return this._countQueuingStrategyHighWaterMark;\n  }\n\n  /**\n   * Measures the size of `chunk` by always returning 1.\n   * This ensures that the total queue size is a count of the number of chunks in the queue.\n   */\n  get size(): (chunk: any) => 1 {\n    if (!IsCountQueuingStrategy(this)) {\n      throw countBrandCheckException('size');\n    }\n    return countSizeFunction;\n  }\n}\n\nObject.defineProperties(CountQueuingStrategy.prototype, {\n  highWaterMark: { enumerable: true },\n  size: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(CountQueuingStrategy.prototype, Symbol.toStringTag, {\n    value: 'CountQueuingStrategy',\n    configurable: true\n  });\n}\n\n// Helper functions for the CountQueuingStrategy.\n\nfunction countBrandCheckException(name: string): TypeError {\n  return new TypeError(`CountQueuingStrategy.prototype.${name} can only be used on a CountQueuingStrategy`);\n}\n\nexport function IsCountQueuingStrategy(x: any): x is CountQueuingStrategy {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_countQueuingStrategyHighWaterMark')) {\n    return false;\n  }\n\n  return x instanceof CountQueuingStrategy;\n}\n","import { assertDictionary, assertFunction } from './basic';\nimport { promiseCall, reflectCall } from '../helpers/webidl';\nimport {\n  Transformer,\n  TransformerFlushCallback,\n  TransformerStartCallback,\n  TransformerTransformCallback,\n  ValidatedTransformer\n} from '../transform-stream/transformer';\nimport { TransformStreamDefaultController } from '../transform-stream';\n\nexport function convertTransformer<I, O>(original: Transformer<I, O> | null,\n                                         context: string): ValidatedTransformer<I, O> {\n  assertDictionary(original, context);\n  const flush = original?.flush;\n  const readableType = original?.readableType;\n  const start = original?.start;\n  const transform = original?.transform;\n  const writableType = original?.writableType;\n  return {\n    flush: flush === undefined ?\n      undefined :\n      convertTransformerFlushCallback(flush, original!, `${context} has member 'flush' that`),\n    readableType,\n    start: start === undefined ?\n      undefined :\n      convertTransformerStartCallback(start, original!, `${context} has member 'start' that`),\n    transform: transform === undefined ?\n      undefined :\n      convertTransformerTransformCallback(transform, original!, `${context} has member 'transform' that`),\n    writableType\n  };\n}\n\nfunction convertTransformerFlushCallback<I, O>(\n  fn: TransformerFlushCallback<O>,\n  original: Transformer<I, O>,\n  context: string\n): (controller: TransformStreamDefaultController<O>) => Promise<void> {\n  assertFunction(fn, context);\n  return (controller: TransformStreamDefaultController<O>) => promiseCall(fn, original, [controller]);\n}\n\nfunction convertTransformerStartCallback<I, O>(\n  fn: TransformerStartCallback<O>,\n  original: Transformer<I, O>,\n  context: string\n): TransformerStartCallback<O> {\n  assertFunction(fn, context);\n  return (controller: TransformStreamDefaultController<O>) => reflectCall(fn, original, [controller]);\n}\n\nfunction convertTransformerTransformCallback<I, O>(\n  fn: TransformerTransformCallback<I, O>,\n  original: Transformer<I, O>,\n  context: string\n): (chunk: I, controller: TransformStreamDefaultController<O>) => Promise<void> {\n  assertFunction(fn, context);\n  return (chunk: I, controller: TransformStreamDefaultController<O>) => promiseCall(fn, original, [chunk, controller]);\n}\n","import assert from '../stub/assert';\nimport { newPromise, promiseRejectedWith, promiseResolvedWith, transformPromiseWith } from './helpers/webidl';\nimport { CreateReadableStream, ReadableStream, ReadableStreamDefaultController } from './readable-stream';\nimport {\n  ReadableStreamDefaultControllerCanCloseOrEnqueue,\n  ReadableStreamDefaultControllerClose,\n  ReadableStreamDefaultControllerEnqueue,\n  ReadableStreamDefaultControllerError,\n  ReadableStreamDefaultControllerGetDesiredSize,\n  ReadableStreamDefaultControllerHasBackpressure\n} from './readable-stream/default-controller';\nimport { QueuingStrategy, QueuingStrategySizeCallback } from './queuing-strategy';\nimport { CreateWritableStream, WritableStream, WritableStreamDefaultControllerErrorIfNeeded } from './writable-stream';\nimport { typeIsObject } from './helpers/miscellaneous';\nimport { IsNonNegativeNumber } from './abstract-ops/miscellaneous';\nimport { convertQueuingStrategy } from './validators/queuing-strategy';\nimport { ExtractHighWaterMark, ExtractSizeAlgorithm } from './abstract-ops/queuing-strategy';\nimport {\n  Transformer,\n  TransformerFlushCallback,\n  TransformerStartCallback,\n  TransformerTransformCallback,\n  ValidatedTransformer\n} from './transform-stream/transformer';\nimport { convertTransformer } from './validators/transformer';\n\n// Class TransformStream\n\n/**\n * A transform stream consists of a pair of streams: a {@link WritableStream | writable stream},\n * known as its writable side, and a {@link ReadableStream | readable stream}, known as its readable side.\n * In a manner specific to the transform stream in question, writes to the writable side result in new data being\n * made available for reading from the readable side.\n *\n * @public\n */\nexport class TransformStream<I = any, O = any> {\n  /** @internal */\n  _writable!: WritableStream<I>;\n  /** @internal */\n  _readable!: ReadableStream<O>;\n  /** @internal */\n  _backpressure!: boolean;\n  /** @internal */\n  _backpressureChangePromise!: Promise<void>;\n  /** @internal */\n  _backpressureChangePromise_resolve!: () => void;\n  /** @internal */\n  _transformStreamController!: TransformStreamDefaultController<O>;\n\n  constructor(\n    transformer?: Transformer<I, O>,\n    writableStrategy?: QueuingStrategy<I>,\n    readableStrategy?: QueuingStrategy<O>\n  );\n  constructor(rawTransformer: Transformer<I, O> | null | undefined = {},\n              rawWritableStrategy: QueuingStrategy<I> | null | undefined = {},\n              rawReadableStrategy: QueuingStrategy<O> | null | undefined = {}) {\n    if (rawTransformer === undefined) {\n      rawTransformer = null;\n    }\n\n    const writableStrategy = convertQueuingStrategy(rawWritableStrategy, 'Second parameter');\n    const readableStrategy = convertQueuingStrategy(rawReadableStrategy, 'Third parameter');\n\n    const transformer = convertTransformer(rawTransformer, 'First parameter');\n    if (transformer.readableType !== undefined) {\n      throw new RangeError('Invalid readableType specified');\n    }\n    if (transformer.writableType !== undefined) {\n      throw new RangeError('Invalid writableType specified');\n    }\n\n    const readableHighWaterMark = ExtractHighWaterMark(readableStrategy, 0);\n    const readableSizeAlgorithm = ExtractSizeAlgorithm(readableStrategy);\n    const writableHighWaterMark = ExtractHighWaterMark(writableStrategy, 1);\n    const writableSizeAlgorithm = ExtractSizeAlgorithm(writableStrategy);\n\n    let startPromise_resolve!: (value: void | PromiseLike<void>) => void;\n    const startPromise = newPromise<void>(resolve => {\n      startPromise_resolve = resolve;\n    });\n\n    InitializeTransformStream(\n      this, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark, readableSizeAlgorithm\n    );\n    SetUpTransformStreamDefaultControllerFromTransformer(this, transformer);\n\n    if (transformer.start !== undefined) {\n      startPromise_resolve(transformer.start(this._transformStreamController));\n    } else {\n      startPromise_resolve(undefined);\n    }\n  }\n\n  /**\n   * The readable side of the transform stream.\n   */\n  get readable(): ReadableStream<O> {\n    if (!IsTransformStream(this)) {\n      throw streamBrandCheckException('readable');\n    }\n\n    return this._readable;\n  }\n\n  /**\n   * The writable side of the transform stream.\n   */\n  get writable(): WritableStream<I> {\n    if (!IsTransformStream(this)) {\n      throw streamBrandCheckException('writable');\n    }\n\n    return this._writable;\n  }\n}\n\nObject.defineProperties(TransformStream.prototype, {\n  readable: { enumerable: true },\n  writable: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(TransformStream.prototype, Symbol.toStringTag, {\n    value: 'TransformStream',\n    configurable: true\n  });\n}\n\nexport {\n  Transformer,\n  TransformerStartCallback,\n  TransformerFlushCallback,\n  TransformerTransformCallback\n};\n\n// Transform Stream Abstract Operations\n\nexport function CreateTransformStream<I, O>(startAlgorithm: () => void | PromiseLike<void>,\n                                            transformAlgorithm: (chunk: I) => Promise<void>,\n                                            flushAlgorithm: () => Promise<void>,\n                                            writableHighWaterMark = 1,\n                                            writableSizeAlgorithm: QueuingStrategySizeCallback<I> = () => 1,\n                                            readableHighWaterMark = 0,\n                                            readableSizeAlgorithm: QueuingStrategySizeCallback<O> = () => 1) {\n  assert(IsNonNegativeNumber(writableHighWaterMark));\n  assert(IsNonNegativeNumber(readableHighWaterMark));\n\n  const stream: TransformStream<I, O> = Object.create(TransformStream.prototype);\n\n  let startPromise_resolve!: (value: void | PromiseLike<void>) => void;\n  const startPromise = newPromise<void>(resolve => {\n    startPromise_resolve = resolve;\n  });\n\n  InitializeTransformStream(stream, startPromise, writableHighWaterMark, writableSizeAlgorithm, readableHighWaterMark,\n                            readableSizeAlgorithm);\n\n  const controller: TransformStreamDefaultController<O> = Object.create(TransformStreamDefaultController.prototype);\n\n  SetUpTransformStreamDefaultController(stream, controller, transformAlgorithm, flushAlgorithm);\n\n  const startResult = startAlgorithm();\n  startPromise_resolve(startResult);\n  return stream;\n}\n\nfunction InitializeTransformStream<I, O>(stream: TransformStream<I, O>,\n                                         startPromise: Promise<void>,\n                                         writableHighWaterMark: number,\n                                         writableSizeAlgorithm: QueuingStrategySizeCallback<I>,\n                                         readableHighWaterMark: number,\n                                         readableSizeAlgorithm: QueuingStrategySizeCallback<O>) {\n  function startAlgorithm(): Promise<void> {\n    return startPromise;\n  }\n\n  function writeAlgorithm(chunk: I): Promise<void> {\n    return TransformStreamDefaultSinkWriteAlgorithm(stream, chunk);\n  }\n\n  function abortAlgorithm(reason: any): Promise<void> {\n    return TransformStreamDefaultSinkAbortAlgorithm(stream, reason);\n  }\n\n  function closeAlgorithm(): Promise<void> {\n    return TransformStreamDefaultSinkCloseAlgorithm(stream);\n  }\n\n  stream._writable = CreateWritableStream(startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm,\n                                          writableHighWaterMark, writableSizeAlgorithm);\n\n  function pullAlgorithm(): Promise<void> {\n    return TransformStreamDefaultSourcePullAlgorithm(stream);\n  }\n\n  function cancelAlgorithm(reason: any): Promise<void> {\n    TransformStreamErrorWritableAndUnblockWrite(stream, reason);\n    return promiseResolvedWith(undefined);\n  }\n\n  stream._readable = CreateReadableStream(startAlgorithm, pullAlgorithm, cancelAlgorithm, readableHighWaterMark,\n                                          readableSizeAlgorithm);\n\n  // The [[backpressure]] slot is set to undefined so that it can be initialised by TransformStreamSetBackpressure.\n  stream._backpressure = undefined!;\n  stream._backpressureChangePromise = undefined!;\n  stream._backpressureChangePromise_resolve = undefined!;\n  TransformStreamSetBackpressure(stream, true);\n\n  stream._transformStreamController = undefined!;\n}\n\nfunction IsTransformStream(x: unknown): x is TransformStream {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_transformStreamController')) {\n    return false;\n  }\n\n  return x instanceof TransformStream;\n}\n\n// This is a no-op if both sides are already errored.\nfunction TransformStreamError(stream: TransformStream, e: any) {\n  ReadableStreamDefaultControllerError(\n    stream._readable._readableStreamController as ReadableStreamDefaultController<any>,\n    e\n  );\n  TransformStreamErrorWritableAndUnblockWrite(stream, e);\n}\n\nfunction TransformStreamErrorWritableAndUnblockWrite(stream: TransformStream, e: any) {\n  TransformStreamDefaultControllerClearAlgorithms(stream._transformStreamController);\n  WritableStreamDefaultControllerErrorIfNeeded(stream._writable._writableStreamController, e);\n  if (stream._backpressure) {\n    // Pretend that pull() was called to permit any pending write() calls to complete. TransformStreamSetBackpressure()\n    // cannot be called from enqueue() or pull() once the ReadableStream is errored, so this will will be the final time\n    // _backpressure is set.\n    TransformStreamSetBackpressure(stream, false);\n  }\n}\n\nfunction TransformStreamSetBackpressure(stream: TransformStream, backpressure: boolean) {\n  // Passes also when called during construction.\n  assert(stream._backpressure !== backpressure);\n\n  if (stream._backpressureChangePromise !== undefined) {\n    stream._backpressureChangePromise_resolve();\n  }\n\n  stream._backpressureChangePromise = newPromise(resolve => {\n    stream._backpressureChangePromise_resolve = resolve;\n  });\n\n  stream._backpressure = backpressure;\n}\n\n// Class TransformStreamDefaultController\n\n/**\n * Allows control of the {@link ReadableStream} and {@link WritableStream} of the associated {@link TransformStream}.\n *\n * @public\n */\nexport class TransformStreamDefaultController<O> {\n  /** @internal */\n  _controlledTransformStream: TransformStream<any, O>;\n  /** @internal */\n  _transformAlgorithm: (chunk: any) => Promise<void>;\n  /** @internal */\n  _flushAlgorithm: () => Promise<void>;\n\n  private constructor() {\n    throw new TypeError('Illegal constructor');\n  }\n\n  /**\n   * Returns the desired size to fill the readable side’s internal queue. It can be negative, if the queue is over-full.\n   */\n  get desiredSize(): number | null {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('desiredSize');\n    }\n\n    const readableController = this._controlledTransformStream._readable._readableStreamController;\n    return ReadableStreamDefaultControllerGetDesiredSize(readableController as ReadableStreamDefaultController<O>);\n  }\n\n  /**\n   * Enqueues the given chunk `chunk` in the readable side of the controlled transform stream.\n   */\n  enqueue(chunk: O): void;\n  enqueue(chunk: O = undefined!): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('enqueue');\n    }\n\n    TransformStreamDefaultControllerEnqueue(this, chunk);\n  }\n\n  /**\n   * Errors both the readable side and the writable side of the controlled transform stream, making all future\n   * interactions with it fail with the given error `e`. Any chunks queued for transformation will be discarded.\n   */\n  error(reason: any = undefined): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('error');\n    }\n\n    TransformStreamDefaultControllerError(this, reason);\n  }\n\n  /**\n   * Closes the readable side and errors the writable side of the controlled transform stream. This is useful when the\n   * transformer only needs to consume a portion of the chunks written to the writable side.\n   */\n  terminate(): void {\n    if (!IsTransformStreamDefaultController(this)) {\n      throw defaultControllerBrandCheckException('terminate');\n    }\n\n    TransformStreamDefaultControllerTerminate(this);\n  }\n}\n\nObject.defineProperties(TransformStreamDefaultController.prototype, {\n  enqueue: { enumerable: true },\n  error: { enumerable: true },\n  terminate: { enumerable: true },\n  desiredSize: { enumerable: true }\n});\nif (typeof Symbol.toStringTag === 'symbol') {\n  Object.defineProperty(TransformStreamDefaultController.prototype, Symbol.toStringTag, {\n    value: 'TransformStreamDefaultController',\n    configurable: true\n  });\n}\n\n// Transform Stream Default Controller Abstract Operations\n\nfunction IsTransformStreamDefaultController<O = any>(x: any): x is TransformStreamDefaultController<O> {\n  if (!typeIsObject(x)) {\n    return false;\n  }\n\n  if (!Object.prototype.hasOwnProperty.call(x, '_controlledTransformStream')) {\n    return false;\n  }\n\n  return x instanceof TransformStreamDefaultController;\n}\n\nfunction SetUpTransformStreamDefaultController<I, O>(stream: TransformStream<I, O>,\n                                                     controller: TransformStreamDefaultController<O>,\n                                                     transformAlgorithm: (chunk: I) => Promise<void>,\n                                                     flushAlgorithm: () => Promise<void>) {\n  assert(IsTransformStream(stream));\n  assert(stream._transformStreamController === undefined);\n\n  controller._controlledTransformStream = stream;\n  stream._transformStreamController = controller;\n\n  controller._transformAlgorithm = transformAlgorithm;\n  controller._flushAlgorithm = flushAlgorithm;\n}\n\nfunction SetUpTransformStreamDefaultControllerFromTransformer<I, O>(stream: TransformStream<I, O>,\n                                     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TransformStreamDefaultController<any>) {\n  controller._transformAlgorithm = undefined!;\n  controller._flushAlgorithm = undefined!;\n}\n\nfunction TransformStreamDefaultControllerEnqueue<O>(controller: TransformStreamDefaultController<O>, chunk: O) {\n  const stream = controller._controlledTransformStream;\n  const readableController = stream._readable._readableStreamController as ReadableStreamDefaultController<O>;\n  if (!ReadableStreamDefaultControllerCanCloseOrEnqueue(readableController)) {\n    throw new TypeError('Readable side is not in a state that permits enqueue');\n  }\n\n  // We throttle transform invocations based on the backpressure of the ReadableStream, but we still\n  // accept TransformStreamDefaultControllerEnqueue() calls.\n\n  try {\n    ReadableStreamDefaultControllerEnqueue(readableController, chunk);\n  } catch (e) {\n    // This happens when readableStrategy.size() throws.\n    TransformStreamErrorWritableAndUnblockWrite(stream, e);\n\n    throw stream._readable._storedError;\n  }\n\n  const backpressure = ReadableStreamDefaultControllerHasBackpressure(readableController);\n  if (backpressure !== stream._backpressure) {\n    assert(backpressure);\n    TransformStreamSetBackpressure(stream, true);\n  }\n}\n\nfunction TransformStreamDefaultControllerError(controller: TransformStreamDefaultController<any>, e: any) {\n  TransformStreamError(controller._controlledTransformStream, e);\n}\n\nfunction TransformStreamDefaultControllerPerformTransform<I, O>(controller: TransformStreamDefaultController<O>,\n                                                                chunk: I) {\n  const transformPromise = controller._transformAlgorithm(chunk);\n  return transformPromiseWith(transformPromise, undefined, r => {\n    TransformStreamError(controller._controlledTransformStream, r);\n    throw r;\n  });\n}\n\nfunction TransformStreamDefaultControllerTerminate<O>(controller: TransformStreamDefaultController<O>) {\n  const stream = controller._controlledTransformStream;\n  const readableController = stream._readable._readableStreamController as ReadableStreamDefaultController<O>;\n\n  ReadableStreamDefaultControllerClose(readableController);\n\n  const error = new TypeError('TransformStream terminated');\n  TransformStreamErrorWritableAndUnblockWrite(stream, error);\n}\n\n// TransformStreamDefaultSink Algorithms\n\nfunction TransformStreamDefaultSinkWriteAlgorithm<I, O>(stream: TransformStream<I, O>, chunk: I): Promise<void> {\n  assert(stream._writable._state === 'writable');\n\n  const controller = stream._transformStreamController;\n\n  if (stream._backpressure) {\n    const backpressureChangePromise = stream._backpressureChangePromise;\n    assert(backpressureChangePromise !== undefined);\n    return transformPromiseWith(backpressureChangePromise, () => {\n      const writable = stream._writable;\n      const state = writable._state;\n      if (state === 'erroring') {\n        throw writable._storedError;\n      }\n      assert(state === 'writable');\n      return TransformStreamDefaultControllerPerformTransform<I, O>(controller, chunk);\n    });\n  }\n\n  return TransformStreamDefaultControllerPerformTransform<I, O>(controller, chunk);\n}\n\nfunction TransformStreamDefaultSinkAbortAlgorithm(stream: TransformStream, reason: any): Promise<void> {\n  // abort() is not called synchronously, so it is possible for abort() to be called when the stream is already\n  // errored.\n  TransformStreamError(stream, reason);\n  return promiseResolvedWith(undefined);\n}\n\nfunction TransformStreamDefaultSinkCloseAlgorithm<I, O>(stream: TransformStream<I, O>): Promise<void> {\n  // stream._readable cannot change after construction, so caching it across a call to user code is safe.\n  const readable = stream._readable;\n\n  const controller = stream._transformStreamController;\n  const flushPromise = controller._flushAlgorithm();\n  TransformStreamDefaultControllerClearAlgorithms(controller);\n\n  // Return a promise that is fulfilled with undefined on success.\n  return transformPromiseWith(flushPromise, () => {\n    if (readable._state === 'errored') {\n      throw readable._storedError;\n    }\n    ReadableStreamDefaultControllerClose(readable._readableStreamController as ReadableStreamDefaultController<O>);\n  }, r => {\n    TransformStreamError(stream, r);\n    throw readable._storedError;\n  });\n}\n\n// TransformStreamDefaultSource Algorithms\n\nfunction TransformStreamDefaultSourcePullAlgorithm(stream: TransformStream): Promise<void> {\n  // Invariant. 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\ No newline at end of file
diff --git a/node_modules/web-streams-polyfill/dist/types/polyfill.d.ts b/node_modules/web-streams-polyfill/dist/types/polyfill.d.ts
new file mode 100644
index 0000000..e44c663
--- /dev/null
+++ b/node_modules/web-streams-polyfill/dist/types/polyfill.d.ts
@@ -0,0 +1,771 @@
+/// <reference lib="esnext.asynciterable" />
+
+/**
+ * A signal object that allows you to communicate with a request and abort it if required
+ * via its associated `AbortController` object.
+ *
+ * @remarks
+ *   This interface is compatible with the `AbortSignal` interface defined in TypeScript's DOM types.
+ *   It is redefined here, so it can be polyfilled without a DOM, for example with
+ *   {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.
+ *
+ * @public
+ */
+export declare interface AbortSignal {
+    /**
+     * Whether the request is aborted.
+     */
+    readonly aborted: boolean;
+    /**
+     * Add an event listener to be triggered when this signal becomes aborted.
+     */
+    addEventListener(type: 'abort', listener: () => void): void;
+    /**
+     * Remove an event listener that was previously added with {@link AbortSignal.addEventListener}.
+     */
+    removeEventListener(type: 'abort', listener: () => void): void;
+}
+
+/**
+ * A queuing strategy that counts the number of bytes in each chunk.
+ *
+ * @public
+ */
+export declare class ByteLengthQueuingStrategy implements QueuingStrategy<ArrayBufferView> {
+    constructor(options: QueuingStrategyInit);
+    /**
+     * Returns the high water mark provided to the constructor.
+     */
+    readonly highWaterMark: number;
+    /**
+     * Measures the size of `chunk` by returning the value of its `byteLength` property.
+     */
+    readonly size: (chunk: ArrayBufferView) => number;
+}
+
+/**
+ * A queuing strategy that counts the number of chunks.
+ *
+ * @public
+ */
+export declare class CountQueuingStrategy implements QueuingStrategy<any> {
+    constructor(options: QueuingStrategyInit);
+    /**
+     * Returns the high water mark provided to the constructor.
+     */
+    readonly highWaterMark: number;
+    /**
+     * Measures the size of `chunk` by always returning 1.
+     * This ensures that the total queue size is a count of the number of chunks in the queue.
+     */
+    readonly size: (chunk: any) => 1;
+}
+
+/**
+ * A queuing strategy.
+ *
+ * @public
+ */
+export declare interface QueuingStrategy<T = any> {
+    /**
+     * A non-negative number indicating the high water mark of the stream using this queuing strategy.
+     */
+    highWaterMark?: number;
+    /**
+     * A function that computes and returns the finite non-negative size of the given chunk value.
+     */
+    size?: QueuingStrategySizeCallback<T>;
+}
+
+/**
+ * @public
+ */
+export declare interface QueuingStrategyInit {
+    /**
+     * {@inheritDoc QueuingStrategy.highWaterMark}
+     */
+    highWaterMark: number;
+}
+
+declare type QueuingStrategySizeCallback<T = any> = (chunk: T) => number;
+
+declare type ReadableByteStream = ReadableStream<Uint8Array> & {
+    _readableStreamController: ReadableByteStreamController;
+};
+
+/**
+ * Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue.
+ *
+ * @public
+ */
+export declare class ReadableByteStreamController {
+    private constructor();
+    /**
+     * Returns the current BYOB pull request, or `null` if there isn't one.
+     */
+    readonly byobRequest: ReadableStreamBYOBRequest | null;
+    /**
+     * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is
+     * over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure.
+     */
+    readonly desiredSize: number | null;
+    /**
+     * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from
+     * the stream, but once those are read, the stream will become closed.
+     */
+    close(): void;
+    /**
+     * Enqueues the given chunk chunk in the controlled readable stream.
+     * The chunk has to be an `ArrayBufferView` instance, or else a `TypeError` will be thrown.
+     */
+    enqueue(chunk: ArrayBufferView): void;
+    /**
+     * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.
+     */
+    error(e?: any): void;
+}
+
+/**
+ * A readable stream represents a source of data, from which you can read.
+ *
+ * @public
+ */
+export declare class ReadableStream<R = any> {
+    constructor(underlyingSource: UnderlyingByteSource, strategy?: {
+        highWaterMark?: number;
+        size?: undefined;
+    });
+    constructor(underlyingSource?: UnderlyingSource<R>, strategy?: QueuingStrategy<R>);
+    /**
+     * Whether or not the readable stream is locked to a {@link ReadableStreamDefaultReader | reader}.
+     */
+    readonly locked: boolean;
+    /**
+     * Cancels the stream, signaling a loss of interest in the stream by a consumer.
+     *
+     * The supplied `reason` argument will be given to the underlying source's {@link UnderlyingSource.cancel | cancel()}
+     * method, which might or might not use it.
+     */
+    cancel(reason?: any): Promise<void>;
+    /**
+     * Creates a {@link ReadableStreamBYOBReader} and locks the stream to the new reader.
+     *
+     * This call behaves the same way as the no-argument variant, except that it only works on readable byte streams,
+     * i.e. streams which were constructed specifically with the ability to handle "bring your own buffer" reading.
+     * The returned BYOB reader provides the ability to directly read individual chunks from the stream via its
+     * {@link ReadableStreamBYOBReader.read | read()} method, into developer-supplied buffers, allowing more precise
+     * control over allocation.
+     */
+    getReader({ mode }: {
+        mode: 'byob';
+    }): ReadableStreamBYOBReader;
+    /**
+     * Creates a {@link ReadableStreamDefaultReader} and locks the stream to the new reader.
+     * While the stream is locked, no other reader can be acquired until this one is released.
+     *
+     * This functionality is especially useful for creating abstractions that desire the ability to consume a stream
+     * in its entirety. By getting a reader for the stream, you can ensure nobody else can interleave reads with yours
+     * or cancel the stream, which would interfere with your abstraction.
+     */
+    getReader(): ReadableStreamDefaultReader<R>;
+    /**
+     * Provides a convenient, chainable way of piping this readable stream through a transform stream
+     * (or any other `{ writable, readable }` pair). It simply {@link ReadableStream.pipeTo | pipes} the stream
+     * into the writable side of the supplied pair, and returns the readable side for further use.
+     *
+     * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.
+     */
+    pipeThrough<RS extends ReadableStream>(transform: {
+        readable: RS;
+        writable: WritableStream<R>;
+    }, options?: StreamPipeOptions): RS;
+    /**
+     * Pipes this readable stream to a given writable stream. The way in which the piping process behaves under
+     * various error conditions can be customized with a number of passed options. It returns a promise that fulfills
+     * when the piping process completes successfully, or rejects if any errors were encountered.
+     *
+     * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.
+     */
+    pipeTo(destination: WritableStream<R>, options?: StreamPipeOptions): Promise<void>;
+    /**
+     * Tees this readable stream, returning a two-element array containing the two resulting branches as
+     * new {@link ReadableStream} instances.
+     *
+     * Teeing a stream will lock it, preventing any other consumer from acquiring a reader.
+     * To cancel the stream, cancel both of the resulting branches; a composite cancellation reason will then be
+     * propagated to the stream's underlying source.
+     *
+     * Note that the chunks seen in each branch will be the same object. If the chunks are not immutable,
+     * this could allow interference between the two branches.
+     */
+    tee(): [ReadableStream<R>, ReadableStream<R>];
+    /**
+     * Asynchronously iterates over the chunks in the stream's internal queue.
+     *
+     * Asynchronously iterating over the stream will lock it, preventing any other consumer from acquiring a reader.
+     * The lock will be released if the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method
+     * is called, e.g. by breaking out of the loop.
+     *
+     * By default, calling the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method will also
+     * cancel the stream. To prevent this, use the stream's {@link ReadableStream.values | values()} method, passing
+     * `true` for the `preventCancel` option.
+     */
+    values(options?: ReadableStreamIteratorOptions): ReadableStreamAsyncIterator<R>;
+    /**
+     * {@inheritDoc ReadableStream.values}
+     */
+    [Symbol.asyncIterator]: (options?: ReadableStreamIteratorOptions) => ReadableStreamAsyncIterator<R>;
+}
+
+/**
+ * An async iterator returned by {@link ReadableStream.values}.
+ *
+ * @public
+ */
+export declare interface ReadableStreamAsyncIterator<R> extends AsyncIterator<R> {
+    next(): Promise<IteratorResult<R, undefined>>;
+    return(value?: any): Promise<IteratorResult<any>>;
+}
+
+/**
+ * A BYOB reader vended by a {@link ReadableStream}.
+ *
+ * @public
+ */
+export declare class ReadableStreamBYOBReader {
+    constructor(stream: ReadableByteStream);
+    /**
+     * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or
+     * the reader's lock is released before the stream finishes closing.
+     */
+    readonly closed: Promise<undefined>;
+    /**
+     * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.
+     */
+    cancel(reason?: any): Promise<void>;
+    /**
+     * Attempts to reads bytes into view, and returns a promise resolved with the result.
+     *
+     * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.
+     */
+    read<T extends ArrayBufferView>(view: T): Promise<ReadableStreamBYOBReadResult<T>>;
+    /**
+     * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.
+     * If the associated stream is errored when the lock is released, the reader will appear errored in the same way
+     * from now on; otherwise, the reader will appear closed.
+     *
+     * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by
+     * the reader's {@link ReadableStreamBYOBReader.read | read()} method has not yet been settled. Attempting to
+     * do so will throw a `TypeError` and leave the reader locked to the stream.
+     */
+    releaseLock(): void;
+}
+
+/**
+ * A result returned by {@link ReadableStreamBYOBReader.read}.
+ *
+ * @public
+ */
+export declare type ReadableStreamBYOBReadResult<T extends ArrayBufferView> = {
+    done: false;
+    value: T;
+} | {
+    done: true;
+    value: T | undefined;
+};
+
+/**
+ * A pull-into request in a {@link ReadableByteStreamController}.
+ *
+ * @public
+ */
+export declare class ReadableStreamBYOBRequest {
+    private constructor();
+    /**
+     * Returns the view for writing in to, or `null` if the BYOB request has already been responded to.
+     */
+    readonly view: ArrayBufferView | null;
+    /**
+     * Indicates to the associated readable byte stream that `bytesWritten` bytes were written into
+     * {@link ReadableStreamBYOBRequest.view | view}, causing the result be surfaced to the consumer.
+     *
+     * After this method is called, {@link ReadableStreamBYOBRequest.view | view} will be transferred and no longer
+     * modifiable.
+     */
+    respond(bytesWritten: number): void;
+    /**
+     * Indicates to the associated readable byte stream that instead of writing into
+     * {@link ReadableStreamBYOBRequest.view | view}, the underlying byte source is providing a new `ArrayBufferView`,
+     * which will be given to the consumer of the readable byte stream.
+     *
+     * After this method is called, `view` will be transferred and no longer modifiable.
+     */
+    respondWithNewView(view: ArrayBufferView): void;
+}
+
+/**
+ * Allows control of a {@link ReadableStream | readable stream}'s state and internal queue.
+ *
+ * @public
+ */
+export declare class ReadableStreamDefaultController<R> {
+    private constructor();
+    /**
+     * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is
+     * over-full. An underlying source ought to use this information to determine when and how to apply backpressure.
+     */
+    readonly desiredSize: number | null;
+    /**
+     * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from
+     * the stream, but once those are read, the stream will become closed.
+     */
+    close(): void;
+    /**
+     * Enqueues the given chunk `chunk` in the controlled readable stream.
+     */
+    enqueue(chunk: R): void;
+    /**
+     * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.
+     */
+    error(e?: any): void;
+}
+
+/**
+ * A default reader vended by a {@link ReadableStream}.
+ *
+ * @public
+ */
+export declare class ReadableStreamDefaultReader<R = any> {
+    constructor(stream: ReadableStream<R>);
+    /**
+     * Returns a promise that will be fulfilled when the stream becomes closed,
+     * or rejected if the stream ever errors or the reader's lock is released before the stream finishes closing.
+     */
+    readonly closed: Promise<undefined>;
+    /**
+     * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.
+     */
+    cancel(reason?: any): Promise<void>;
+    /**
+     * Returns a promise that allows access to the next chunk from the stream's internal queue, if available.
+     *
+     * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.
+     */
+    read(): Promise<ReadableStreamDefaultReadResult<R>>;
+    /**
+     * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.
+     * If the associated stream is errored when the lock is released, the reader will appear errored in the same way
+     * from now on; otherwise, the reader will appear closed.
+     *
+     * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by
+     * the reader's {@link ReadableStreamDefaultReader.read | read()} method has not yet been settled. Attempting to
+     * do so will throw a `TypeError` and leave the reader locked to the stream.
+     */
+    releaseLock(): void;
+}
+
+/**
+ * A result returned by {@link ReadableStreamDefaultReader.read}.
+ *
+ * @public
+ */
+export declare type ReadableStreamDefaultReadResult<T> = {
+    done: false;
+    value: T;
+} | {
+    done: true;
+    value?: undefined;
+};
+
+/**
+ * Options for {@link ReadableStream.values | async iterating} a stream.
+ *
+ * @public
+ */
+export declare interface ReadableStreamIteratorOptions {
+    preventCancel?: boolean;
+}
+
+/**
+ * A pair of a {@link ReadableStream | readable stream} and {@link WritableStream | writable stream} that can be passed
+ * to {@link ReadableStream.pipeThrough}.
+ *
+ * @public
+ */
+export declare interface ReadableWritablePair<R, W> {
+    readable: ReadableStream<R>;
+    writable: WritableStream<W>;
+}
+
+/**
+ * Options for {@link ReadableStream.pipeTo | piping} a stream.
+ *
+ * @public
+ */
+export declare interface StreamPipeOptions {
+    /**
+     * If set to true, {@link ReadableStream.pipeTo} will not abort the writable stream if the readable stream errors.
+     */
+    preventAbort?: boolean;
+    /**
+     * If set to true, {@link ReadableStream.pipeTo} will not cancel the readable stream if the writable stream closes
+     * or errors.
+     */
+    preventCancel?: boolean;
+    /**
+     * If set to true, {@link ReadableStream.pipeTo} will not close the writable stream if the readable stream closes.
+     */
+    preventClose?: boolean;
+    /**
+     * Can be set to an {@link AbortSignal} to allow aborting an ongoing pipe operation via the corresponding
+     * `AbortController`. In this case, the source readable stream will be canceled, and the destination writable stream
+     * aborted, unless the respective options `preventCancel` or `preventAbort` are set.
+     */
+    signal?: AbortSignal;
+}
+
+/**
+ * A transformer for constructing a {@link TransformStream}.
+ *
+ * @public
+ */
+export declare interface Transformer<I = any, O = any> {
+    /**
+     * A function that is called immediately during creation of the {@link TransformStream}.
+     */
+    start?: TransformerStartCallback<O>;
+    /**
+     * A function called when a new chunk originally written to the writable side is ready to be transformed.
+     */
+    transform?: TransformerTransformCallback<I, O>;
+    /**
+     * A function called after all chunks written to the writable side have been transformed by successfully passing
+     * through {@link Transformer.transform | transform()}, and the writable side is about to be closed.
+     */
+    flush?: TransformerFlushCallback<O>;
+    readableType?: undefined;
+    writableType?: undefined;
+}
+
+/** @public */
+export declare type TransformerFlushCallback<O> = (controller: TransformStreamDefaultController<O>) => void | PromiseLike<void>;
+
+/** @public */
+export declare type TransformerStartCallback<O> = (controller: TransformStreamDefaultController<O>) => void | PromiseLike<void>;
+
+/** @public */
+export declare type TransformerTransformCallback<I, O> = (chunk: I, controller: TransformStreamDefaultController<O>) => void | PromiseLike<void>;
+
+/**
+ * A transform stream consists of a pair of streams: a {@link WritableStream | writable stream},
+ * known as its writable side, and a {@link ReadableStream | readable stream}, known as its readable side.
+ * In a manner specific to the transform stream in question, writes to the writable side result in new data being
+ * made available for reading from the readable side.
+ *
+ * @public
+ */
+export declare class TransformStream<I = any, O = any> {
+    constructor(transformer?: Transformer<I, O>, writableStrategy?: QueuingStrategy<I>, readableStrategy?: QueuingStrategy<O>);
+    /**
+     * The readable side of the transform stream.
+     */
+    readonly readable: ReadableStream<O>;
+    /**
+     * The writable side of the transform stream.
+     */
+    readonly writable: WritableStream<I>;
+}
+
+/**
+ * Allows control of the {@link ReadableStream} and {@link WritableStream} of the associated {@link TransformStream}.
+ *
+ * @public
+ */
+export declare class TransformStreamDefaultController<O> {
+    private constructor();
+    /**
+     * Returns the desired size to fill the readable side’s internal queue. It can be negative, if the queue is over-full.
+     */
+    readonly desiredSize: number | null;
+    /**
+     * Enqueues the given chunk `chunk` in the readable side of the controlled transform stream.
+     */
+    enqueue(chunk: O): void;
+    /**
+     * Errors both the readable side and the writable side of the controlled transform stream, making all future
+     * interactions with it fail with the given error `e`. Any chunks queued for transformation will be discarded.
+     */
+    error(reason?: any): void;
+    /**
+     * Closes the readable side and errors the writable side of the controlled transform stream. This is useful when the
+     * transformer only needs to consume a portion of the chunks written to the writable side.
+     */
+    terminate(): void;
+}
+
+/**
+ * An underlying byte source for constructing a {@link ReadableStream}.
+ *
+ * @public
+ */
+export declare interface UnderlyingByteSource {
+    /**
+     * {@inheritDoc UnderlyingSource.start}
+     */
+    start?: UnderlyingByteSourceStartCallback;
+    /**
+     * {@inheritDoc UnderlyingSource.pull}
+     */
+    pull?: UnderlyingByteSourcePullCallback;
+    /**
+     * {@inheritDoc UnderlyingSource.cancel}
+     */
+    cancel?: UnderlyingSourceCancelCallback;
+    /**
+     * Can be set to "bytes" to signal that the constructed {@link ReadableStream} is a readable byte stream.
+     * This ensures that the resulting {@link ReadableStream} will successfully be able to vend BYOB readers via its
+     * {@link ReadableStream.(getReader:1) | getReader()} method.
+     * It also affects the controller argument passed to the {@link UnderlyingByteSource.start | start()}
+     * and {@link UnderlyingByteSource.pull | pull()} methods.
+     */
+    type: 'bytes';
+    /**
+     * Can be set to a positive integer to cause the implementation to automatically allocate buffers for the
+     * underlying source code to write into. In this case, when a consumer is using a default reader, the stream
+     * implementation will automatically allocate an ArrayBuffer of the given size, so that
+     * {@link ReadableByteStreamController.byobRequest | controller.byobRequest} is always present,
+     * as if the consumer was using a BYOB reader.
+     */
+    autoAllocateChunkSize?: number;
+}
+
+/** @public */
+export declare type UnderlyingByteSourcePullCallback = (controller: ReadableByteStreamController) => void | PromiseLike<void>;
+
+/** @public */
+export declare type UnderlyingByteSourceStartCallback = (controller: ReadableByteStreamController) => void | PromiseLike<void>;
+
+/**
+ * An underlying sink for constructing a {@link WritableStream}.
+ *
+ * @public
+ */
+export declare interface UnderlyingSink<W = any> {
+    /**
+     * A function that is called immediately during creation of the {@link WritableStream}.
+     */
+    start?: UnderlyingSinkStartCallback;
+    /**
+     * A function that is called when a new chunk of data is ready to be written to the underlying sink. The stream
+     * implementation guarantees that this function will be called only after previous writes have succeeded, and never
+     * before {@link UnderlyingSink.start | start()} has succeeded or after {@link UnderlyingSink.close | close()} or
+     * {@link UnderlyingSink.abort | abort()} have been called.
+     *
+     * This function is used to actually send the data to the resource presented by the underlying sink, for example by
+     * calling a lower-level API.
+     */
+    write?: UnderlyingSinkWriteCallback<W>;
+    /**
+     * A function that is called after the producer signals, via
+     * {@link WritableStreamDefaultWriter.close | writer.close()}, that they are done writing chunks to the stream, and
+     * subsequently all queued-up writes have successfully completed.
+     *
+     * This function can perform any actions necessary to finalize or flush writes to the underlying sink, and release
+     * access to any held resources.
+     */
+    close?: UnderlyingSinkCloseCallback;
+    /**
+     * A function that is called after the producer signals, via {@link WritableStream.abort | stream.abort()} or
+     * {@link WritableStreamDefaultWriter.abort | writer.abort()}, that they wish to abort the stream. It takes as its
+     * argument the same value as was passed to those methods by the producer.
+     *
+     * Writable streams can additionally be aborted under certain conditions during piping; see the definition of the
+     * {@link ReadableStream.pipeTo | pipeTo()} method for more details.
+     *
+     * This function can clean up any held resources, much like {@link UnderlyingSink.close | close()}, but perhaps with
+     * some custom handling.
+     */
+    abort?: UnderlyingSinkAbortCallback;
+    type?: undefined;
+}
+
+/** @public */
+export declare type UnderlyingSinkAbortCallback = (reason: any) => void | PromiseLike<void>;
+
+/** @public */
+export declare type UnderlyingSinkCloseCallback = () => void | PromiseLike<void>;
+
+/** @public */
+export declare type UnderlyingSinkStartCallback = (controller: WritableStreamDefaultController) => void | PromiseLike<void>;
+
+/** @public */
+export declare type UnderlyingSinkWriteCallback<W> = (chunk: W, controller: WritableStreamDefaultController) => void | PromiseLike<void>;
+
+/**
+ * An underlying source for constructing a {@link ReadableStream}.
+ *
+ * @public
+ */
+export declare interface UnderlyingSource<R = any> {
+    /**
+     * A function that is called immediately during creation of the {@link ReadableStream}.
+     */
+    start?: UnderlyingSourceStartCallback<R>;
+    /**
+     * A function that is called whenever the stream’s internal queue of chunks becomes not full,
+     * i.e. whenever the queue’s desired size becomes positive. Generally, it will be called repeatedly
+     * until the queue reaches its high water mark (i.e. until the desired size becomes non-positive).
+     */
+    pull?: UnderlyingSourcePullCallback<R>;
+    /**
+     * A function that is called whenever the consumer cancels the stream, via
+     * {@link ReadableStream.cancel | stream.cancel()},
+     * {@link ReadableStreamDefaultReader.cancel | defaultReader.cancel()}, or
+     * {@link ReadableStreamBYOBReader.cancel | byobReader.cancel()}.
+     * It takes as its argument the same value as was passed to those methods by the consumer.
+     */
+    cancel?: UnderlyingSourceCancelCallback;
+    type?: undefined;
+}
+
+/** @public */
+export declare type UnderlyingSourceCancelCallback = (reason: any) => void | PromiseLike<void>;
+
+/** @public */
+export declare type UnderlyingSourcePullCallback<R> = (controller: ReadableStreamDefaultController<R>) => void | PromiseLike<void>;
+
+/** @public */
+export declare type UnderlyingSourceStartCallback<R> = (controller: ReadableStreamDefaultController<R>) => void | PromiseLike<void>;
+
+/**
+ * A writable stream represents a destination for data, into which you can write.
+ *
+ * @public
+ */
+export declare class WritableStream<W = any> {
+    constructor(underlyingSink?: UnderlyingSink<W>, strategy?: QueuingStrategy<W>);
+    /**
+     * Returns whether or not the writable stream is locked to a writer.
+     */
+    readonly locked: boolean;
+    /**
+     * Aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be
+     * immediately moved to an errored state, with any queued-up writes discarded. This will also execute any abort
+     * mechanism of the underlying sink.
+     *
+     * The returned promise will fulfill if the stream shuts down successfully, or reject if the underlying sink signaled
+     * that there was an error doing so. Additionally, it will reject with a `TypeError` (without attempting to cancel
+     * the stream) if the stream is currently locked.
+     */
+    abort(reason?: any): Promise<void>;
+    /**
+     * Closes the stream. The underlying sink will finish processing any previously-written chunks, before invoking its
+     * close behavior. During this time any further attempts to write will fail (without erroring the stream).
+     *
+     * The method returns a promise that will fulfill if all remaining chunks are successfully written and the stream
+     * successfully closes, or rejects if an error is encountered during this process. Additionally, it will reject with
+     * a `TypeError` (without attempting to cancel the stream) if the stream is currently locked.
+     */
+    close(): Promise<undefined>;
+    /**
+     * Creates a {@link WritableStreamDefaultWriter | writer} and locks the stream to the new writer. While the stream
+     * is locked, no other writer can be acquired until this one is released.
+     *
+     * This functionality is especially useful for creating abstractions that desire the ability to write to a stream
+     * without interruption or interleaving. By getting a writer for the stream, you can ensure nobody else can write at
+     * the same time, which would cause the resulting written data to be unpredictable and probably useless.
+     */
+    getWriter(): WritableStreamDefaultWriter<W>;
+}
+
+/**
+ * Allows control of a {@link WritableStream | writable stream}'s state and internal queue.
+ *
+ * @public
+ */
+export declare class WritableStreamDefaultController<W = any> {
+    private constructor();
+    /**
+     * The reason which was passed to `WritableStream.abort(reason)` when the stream was aborted.
+     *
+     * @deprecated
+     *  This property has been removed from the specification, see https://github.com/whatwg/streams/pull/1177.
+     *  Use {@link WritableStreamDefaultController.signal}'s `reason` instead.
+     */
+    readonly abortReason: any;
+    /**
+     * An `AbortSignal` that can be used to abort the pending write or close operation when the stream is aborted.
+     */
+    readonly signal: AbortSignal;
+    /**
+     * Closes the controlled writable stream, making all future interactions with it fail with the given error `e`.
+     *
+     * This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying
+     * sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the
+     * normal lifecycle of interactions with the underlying sink.
+     */
+    error(e?: any): void;
+}
+
+/**
+ * A default writer vended by a {@link WritableStream}.
+ *
+ * @public
+ */
+export declare class WritableStreamDefaultWriter<W = any> {
+    constructor(stream: WritableStream<W>);
+    /**
+     * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or
+     * the writer’s lock is released before the stream finishes closing.
+     */
+    readonly closed: Promise<undefined>;
+    /**
+     * Returns the desired size to fill the stream’s internal queue. It can be negative, if the queue is over-full.
+     * A producer can use this information to determine the right amount of data to write.
+     *
+     * It will be `null` if the stream cannot be successfully written to (due to either being errored, or having an abort
+     * queued up). It will return zero if the stream is closed. And the getter will throw an exception if invoked when
+     * the writer’s lock is released.
+     */
+    readonly desiredSize: number | null;
+    /**
+     * Returns a promise that will be fulfilled when the desired size to fill the stream’s internal queue transitions
+     * from non-positive to positive, signaling that it is no longer applying backpressure. Once the desired size dips
+     * back to zero or below, the getter will return a new promise that stays pending until the next transition.
+     *
+     * If the stream becomes errored or aborted, or the writer’s lock is released, the returned promise will become
+     * rejected.
+     */
+    readonly ready: Promise<undefined>;
+    /**
+     * If the reader is active, behaves the same as {@link WritableStream.abort | stream.abort(reason)}.
+     */
+    abort(reason?: any): Promise<void>;
+    /**
+     * If the reader is active, behaves the same as {@link WritableStream.close | stream.close()}.
+     */
+    close(): Promise<void>;
+    /**
+     * Releases the writer’s lock on the corresponding stream. After the lock is released, the writer is no longer active.
+     * If the associated stream is errored when the lock is released, the writer will appear errored in the same way from
+     * now on; otherwise, the writer will appear closed.
+     *
+     * Note that the lock can still be released even if some ongoing writes have not yet finished (i.e. even if the
+     * promises returned from previous calls to {@link WritableStreamDefaultWriter.write | write()} have not yet settled).
+     * It’s not necessary to hold the lock on the writer for the duration of the write; the lock instead simply prevents
+     * other producers from writing in an interleaved manner.
+     */
+    releaseLock(): void;
+    /**
+     * Writes the given chunk to the writable stream, by waiting until any previous writes have finished successfully,
+     * and then sending the chunk to the underlying sink's {@link UnderlyingSink.write | write()} method. It will return
+     * a promise that fulfills with undefined upon a successful write, or rejects if the write fails or stream becomes
+     * errored before the writing process is initiated.
+     *
+     * Note that what "success" means is up to the underlying sink; it might indicate simply that the chunk has been
+     * accepted, and not necessarily that it is safely saved to its ultimate destination.
+     */
+    write(chunk: W): Promise<void>;
+}
+
+export { }
diff --git a/node_modules/web-streams-polyfill/dist/types/ts3.6/polyfill.d.ts b/node_modules/web-streams-polyfill/dist/types/ts3.6/polyfill.d.ts
new file mode 100644
index 0000000..c398f7e
--- /dev/null
+++ b/node_modules/web-streams-polyfill/dist/types/ts3.6/polyfill.d.ts
@@ -0,0 +1,771 @@
+/// <reference lib="es2018.asynciterable" />
+
+/**
+ * A signal object that allows you to communicate with a request and abort it if required
+ * via its associated `AbortController` object.
+ *
+ * @remarks
+ *   This interface is compatible with the `AbortSignal` interface defined in TypeScript's DOM types.
+ *   It is redefined here, so it can be polyfilled without a DOM, for example with
+ *   {@link https://www.npmjs.com/package/abortcontroller-polyfill | abortcontroller-polyfill} in a Node environment.
+ *
+ * @public
+ */
+export declare interface AbortSignal {
+    /**
+     * Whether the request is aborted.
+     */
+    readonly aborted: boolean;
+    /**
+     * Add an event listener to be triggered when this signal becomes aborted.
+     */
+    addEventListener(type: 'abort', listener: () => void): void;
+    /**
+     * Remove an event listener that was previously added with {@link AbortSignal.addEventListener}.
+     */
+    removeEventListener(type: 'abort', listener: () => void): void;
+}
+
+/**
+ * A queuing strategy that counts the number of bytes in each chunk.
+ *
+ * @public
+ */
+export declare class ByteLengthQueuingStrategy implements QueuingStrategy<ArrayBufferView> {
+    constructor(options: QueuingStrategyInit);
+    /**
+     * Returns the high water mark provided to the constructor.
+     */
+    get highWaterMark(): number;
+    /**
+     * Measures the size of `chunk` by returning the value of its `byteLength` property.
+     */
+    get size(): (chunk: ArrayBufferView) => number;
+}
+
+/**
+ * A queuing strategy that counts the number of chunks.
+ *
+ * @public
+ */
+export declare class CountQueuingStrategy implements QueuingStrategy<any> {
+    constructor(options: QueuingStrategyInit);
+    /**
+     * Returns the high water mark provided to the constructor.
+     */
+    get highWaterMark(): number;
+    /**
+     * Measures the size of `chunk` by always returning 1.
+     * This ensures that the total queue size is a count of the number of chunks in the queue.
+     */
+    get size(): (chunk: any) => 1;
+}
+
+/**
+ * A queuing strategy.
+ *
+ * @public
+ */
+export declare interface QueuingStrategy<T = any> {
+    /**
+     * A non-negative number indicating the high water mark of the stream using this queuing strategy.
+     */
+    highWaterMark?: number;
+    /**
+     * A function that computes and returns the finite non-negative size of the given chunk value.
+     */
+    size?: QueuingStrategySizeCallback<T>;
+}
+
+/**
+ * @public
+ */
+export declare interface QueuingStrategyInit {
+    /**
+     * {@inheritDoc QueuingStrategy.highWaterMark}
+     */
+    highWaterMark: number;
+}
+
+declare type QueuingStrategySizeCallback<T = any> = (chunk: T) => number;
+
+declare type ReadableByteStream = ReadableStream<Uint8Array> & {
+    _readableStreamController: ReadableByteStreamController;
+};
+
+/**
+ * Allows control of a {@link ReadableStream | readable byte stream}'s state and internal queue.
+ *
+ * @public
+ */
+export declare class ReadableByteStreamController {
+    private constructor();
+    /**
+     * Returns the current BYOB pull request, or `null` if there isn't one.
+     */
+    get byobRequest(): ReadableStreamBYOBRequest | null;
+    /**
+     * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is
+     * over-full. An underlying byte source ought to use this information to determine when and how to apply backpressure.
+     */
+    get desiredSize(): number | null;
+    /**
+     * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from
+     * the stream, but once those are read, the stream will become closed.
+     */
+    close(): void;
+    /**
+     * Enqueues the given chunk chunk in the controlled readable stream.
+     * The chunk has to be an `ArrayBufferView` instance, or else a `TypeError` will be thrown.
+     */
+    enqueue(chunk: ArrayBufferView): void;
+    /**
+     * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.
+     */
+    error(e?: any): void;
+}
+
+/**
+ * A readable stream represents a source of data, from which you can read.
+ *
+ * @public
+ */
+export declare class ReadableStream<R = any> {
+    constructor(underlyingSource: UnderlyingByteSource, strategy?: {
+        highWaterMark?: number;
+        size?: undefined;
+    });
+    constructor(underlyingSource?: UnderlyingSource<R>, strategy?: QueuingStrategy<R>);
+    /**
+     * Whether or not the readable stream is locked to a {@link ReadableStreamDefaultReader | reader}.
+     */
+    get locked(): boolean;
+    /**
+     * Cancels the stream, signaling a loss of interest in the stream by a consumer.
+     *
+     * The supplied `reason` argument will be given to the underlying source's {@link UnderlyingSource.cancel | cancel()}
+     * method, which might or might not use it.
+     */
+    cancel(reason?: any): Promise<void>;
+    /**
+     * Creates a {@link ReadableStreamBYOBReader} and locks the stream to the new reader.
+     *
+     * This call behaves the same way as the no-argument variant, except that it only works on readable byte streams,
+     * i.e. streams which were constructed specifically with the ability to handle "bring your own buffer" reading.
+     * The returned BYOB reader provides the ability to directly read individual chunks from the stream via its
+     * {@link ReadableStreamBYOBReader.read | read()} method, into developer-supplied buffers, allowing more precise
+     * control over allocation.
+     */
+    getReader({ mode }: {
+        mode: 'byob';
+    }): ReadableStreamBYOBReader;
+    /**
+     * Creates a {@link ReadableStreamDefaultReader} and locks the stream to the new reader.
+     * While the stream is locked, no other reader can be acquired until this one is released.
+     *
+     * This functionality is especially useful for creating abstractions that desire the ability to consume a stream
+     * in its entirety. By getting a reader for the stream, you can ensure nobody else can interleave reads with yours
+     * or cancel the stream, which would interfere with your abstraction.
+     */
+    getReader(): ReadableStreamDefaultReader<R>;
+    /**
+     * Provides a convenient, chainable way of piping this readable stream through a transform stream
+     * (or any other `{ writable, readable }` pair). It simply {@link ReadableStream.pipeTo | pipes} the stream
+     * into the writable side of the supplied pair, and returns the readable side for further use.
+     *
+     * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.
+     */
+    pipeThrough<RS extends ReadableStream>(transform: {
+        readable: RS;
+        writable: WritableStream<R>;
+    }, options?: StreamPipeOptions): RS;
+    /**
+     * Pipes this readable stream to a given writable stream. The way in which the piping process behaves under
+     * various error conditions can be customized with a number of passed options. It returns a promise that fulfills
+     * when the piping process completes successfully, or rejects if any errors were encountered.
+     *
+     * Piping a stream will lock it for the duration of the pipe, preventing any other consumer from acquiring a reader.
+     */
+    pipeTo(destination: WritableStream<R>, options?: StreamPipeOptions): Promise<void>;
+    /**
+     * Tees this readable stream, returning a two-element array containing the two resulting branches as
+     * new {@link ReadableStream} instances.
+     *
+     * Teeing a stream will lock it, preventing any other consumer from acquiring a reader.
+     * To cancel the stream, cancel both of the resulting branches; a composite cancellation reason will then be
+     * propagated to the stream's underlying source.
+     *
+     * Note that the chunks seen in each branch will be the same object. If the chunks are not immutable,
+     * this could allow interference between the two branches.
+     */
+    tee(): [ReadableStream<R>, ReadableStream<R>];
+    /**
+     * Asynchronously iterates over the chunks in the stream's internal queue.
+     *
+     * Asynchronously iterating over the stream will lock it, preventing any other consumer from acquiring a reader.
+     * The lock will be released if the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method
+     * is called, e.g. by breaking out of the loop.
+     *
+     * By default, calling the async iterator's {@link ReadableStreamAsyncIterator.return | return()} method will also
+     * cancel the stream. To prevent this, use the stream's {@link ReadableStream.values | values()} method, passing
+     * `true` for the `preventCancel` option.
+     */
+    values(options?: ReadableStreamIteratorOptions): ReadableStreamAsyncIterator<R>;
+    /**
+     * {@inheritDoc ReadableStream.values}
+     */
+    [Symbol.asyncIterator]: (options?: ReadableStreamIteratorOptions) => ReadableStreamAsyncIterator<R>;
+}
+
+/**
+ * An async iterator returned by {@link ReadableStream.values}.
+ *
+ * @public
+ */
+export declare interface ReadableStreamAsyncIterator<R> extends AsyncIterator<R> {
+    next(): Promise<IteratorResult<R, undefined>>;
+    return(value?: any): Promise<IteratorResult<any>>;
+}
+
+/**
+ * A BYOB reader vended by a {@link ReadableStream}.
+ *
+ * @public
+ */
+export declare class ReadableStreamBYOBReader {
+    constructor(stream: ReadableByteStream);
+    /**
+     * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or
+     * the reader's lock is released before the stream finishes closing.
+     */
+    get closed(): Promise<undefined>;
+    /**
+     * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.
+     */
+    cancel(reason?: any): Promise<void>;
+    /**
+     * Attempts to reads bytes into view, and returns a promise resolved with the result.
+     *
+     * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.
+     */
+    read<T extends ArrayBufferView>(view: T): Promise<ReadableStreamBYOBReadResult<T>>;
+    /**
+     * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.
+     * If the associated stream is errored when the lock is released, the reader will appear errored in the same way
+     * from now on; otherwise, the reader will appear closed.
+     *
+     * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by
+     * the reader's {@link ReadableStreamBYOBReader.read | read()} method has not yet been settled. Attempting to
+     * do so will throw a `TypeError` and leave the reader locked to the stream.
+     */
+    releaseLock(): void;
+}
+
+/**
+ * A result returned by {@link ReadableStreamBYOBReader.read}.
+ *
+ * @public
+ */
+export declare type ReadableStreamBYOBReadResult<T extends ArrayBufferView> = {
+    done: false;
+    value: T;
+} | {
+    done: true;
+    value: T | undefined;
+};
+
+/**
+ * A pull-into request in a {@link ReadableByteStreamController}.
+ *
+ * @public
+ */
+export declare class ReadableStreamBYOBRequest {
+    private constructor();
+    /**
+     * Returns the view for writing in to, or `null` if the BYOB request has already been responded to.
+     */
+    get view(): ArrayBufferView | null;
+    /**
+     * Indicates to the associated readable byte stream that `bytesWritten` bytes were written into
+     * {@link ReadableStreamBYOBRequest.view | view}, causing the result be surfaced to the consumer.
+     *
+     * After this method is called, {@link ReadableStreamBYOBRequest.view | view} will be transferred and no longer
+     * modifiable.
+     */
+    respond(bytesWritten: number): void;
+    /**
+     * Indicates to the associated readable byte stream that instead of writing into
+     * {@link ReadableStreamBYOBRequest.view | view}, the underlying byte source is providing a new `ArrayBufferView`,
+     * which will be given to the consumer of the readable byte stream.
+     *
+     * After this method is called, `view` will be transferred and no longer modifiable.
+     */
+    respondWithNewView(view: ArrayBufferView): void;
+}
+
+/**
+ * Allows control of a {@link ReadableStream | readable stream}'s state and internal queue.
+ *
+ * @public
+ */
+export declare class ReadableStreamDefaultController<R> {
+    private constructor();
+    /**
+     * Returns the desired size to fill the controlled stream's internal queue. It can be negative, if the queue is
+     * over-full. An underlying source ought to use this information to determine when and how to apply backpressure.
+     */
+    get desiredSize(): number | null;
+    /**
+     * Closes the controlled readable stream. Consumers will still be able to read any previously-enqueued chunks from
+     * the stream, but once those are read, the stream will become closed.
+     */
+    close(): void;
+    /**
+     * Enqueues the given chunk `chunk` in the controlled readable stream.
+     */
+    enqueue(chunk: R): void;
+    /**
+     * Errors the controlled readable stream, making all future interactions with it fail with the given error `e`.
+     */
+    error(e?: any): void;
+}
+
+/**
+ * A default reader vended by a {@link ReadableStream}.
+ *
+ * @public
+ */
+export declare class ReadableStreamDefaultReader<R = any> {
+    constructor(stream: ReadableStream<R>);
+    /**
+     * Returns a promise that will be fulfilled when the stream becomes closed,
+     * or rejected if the stream ever errors or the reader's lock is released before the stream finishes closing.
+     */
+    get closed(): Promise<undefined>;
+    /**
+     * If the reader is active, behaves the same as {@link ReadableStream.cancel | stream.cancel(reason)}.
+     */
+    cancel(reason?: any): Promise<void>;
+    /**
+     * Returns a promise that allows access to the next chunk from the stream's internal queue, if available.
+     *
+     * If reading a chunk causes the queue to become empty, more data will be pulled from the underlying source.
+     */
+    read(): Promise<ReadableStreamDefaultReadResult<R>>;
+    /**
+     * Releases the reader's lock on the corresponding stream. After the lock is released, the reader is no longer active.
+     * If the associated stream is errored when the lock is released, the reader will appear errored in the same way
+     * from now on; otherwise, the reader will appear closed.
+     *
+     * A reader's lock cannot be released while it still has a pending read request, i.e., if a promise returned by
+     * the reader's {@link ReadableStreamDefaultReader.read | read()} method has not yet been settled. Attempting to
+     * do so will throw a `TypeError` and leave the reader locked to the stream.
+     */
+    releaseLock(): void;
+}
+
+/**
+ * A result returned by {@link ReadableStreamDefaultReader.read}.
+ *
+ * @public
+ */
+export declare type ReadableStreamDefaultReadResult<T> = {
+    done: false;
+    value: T;
+} | {
+    done: true;
+    value?: undefined;
+};
+
+/**
+ * Options for {@link ReadableStream.values | async iterating} a stream.
+ *
+ * @public
+ */
+export declare interface ReadableStreamIteratorOptions {
+    preventCancel?: boolean;
+}
+
+/**
+ * A pair of a {@link ReadableStream | readable stream} and {@link WritableStream | writable stream} that can be passed
+ * to {@link ReadableStream.pipeThrough}.
+ *
+ * @public
+ */
+export declare interface ReadableWritablePair<R, W> {
+    readable: ReadableStream<R>;
+    writable: WritableStream<W>;
+}
+
+/**
+ * Options for {@link ReadableStream.pipeTo | piping} a stream.
+ *
+ * @public
+ */
+export declare interface StreamPipeOptions {
+    /**
+     * If set to true, {@link ReadableStream.pipeTo} will not abort the writable stream if the readable stream errors.
+     */
+    preventAbort?: boolean;
+    /**
+     * If set to true, {@link ReadableStream.pipeTo} will not cancel the readable stream if the writable stream closes
+     * or errors.
+     */
+    preventCancel?: boolean;
+    /**
+     * If set to true, {@link ReadableStream.pipeTo} will not close the writable stream if the readable stream closes.
+     */
+    preventClose?: boolean;
+    /**
+     * Can be set to an {@link AbortSignal} to allow aborting an ongoing pipe operation via the corresponding
+     * `AbortController`. In this case, the source readable stream will be canceled, and the destination writable stream
+     * aborted, unless the respective options `preventCancel` or `preventAbort` are set.
+     */
+    signal?: AbortSignal;
+}
+
+/**
+ * A transformer for constructing a {@link TransformStream}.
+ *
+ * @public
+ */
+export declare interface Transformer<I = any, O = any> {
+    /**
+     * A function that is called immediately during creation of the {@link TransformStream}.
+     */
+    start?: TransformerStartCallback<O>;
+    /**
+     * A function called when a new chunk originally written to the writable side is ready to be transformed.
+     */
+    transform?: TransformerTransformCallback<I, O>;
+    /**
+     * A function called after all chunks written to the writable side have been transformed by successfully passing
+     * through {@link Transformer.transform | transform()}, and the writable side is about to be closed.
+     */
+    flush?: TransformerFlushCallback<O>;
+    readableType?: undefined;
+    writableType?: undefined;
+}
+
+/** @public */
+export declare type TransformerFlushCallback<O> = (controller: TransformStreamDefaultController<O>) => void | PromiseLike<void>;
+
+/** @public */
+export declare type TransformerStartCallback<O> = (controller: TransformStreamDefaultController<O>) => void | PromiseLike<void>;
+
+/** @public */
+export declare type TransformerTransformCallback<I, O> = (chunk: I, controller: TransformStreamDefaultController<O>) => void | PromiseLike<void>;
+
+/**
+ * A transform stream consists of a pair of streams: a {@link WritableStream | writable stream},
+ * known as its writable side, and a {@link ReadableStream | readable stream}, known as its readable side.
+ * In a manner specific to the transform stream in question, writes to the writable side result in new data being
+ * made available for reading from the readable side.
+ *
+ * @public
+ */
+export declare class TransformStream<I = any, O = any> {
+    constructor(transformer?: Transformer<I, O>, writableStrategy?: QueuingStrategy<I>, readableStrategy?: QueuingStrategy<O>);
+    /**
+     * The readable side of the transform stream.
+     */
+    get readable(): ReadableStream<O>;
+    /**
+     * The writable side of the transform stream.
+     */
+    get writable(): WritableStream<I>;
+}
+
+/**
+ * Allows control of the {@link ReadableStream} and {@link WritableStream} of the associated {@link TransformStream}.
+ *
+ * @public
+ */
+export declare class TransformStreamDefaultController<O> {
+    private constructor();
+    /**
+     * Returns the desired size to fill the readable side’s internal queue. It can be negative, if the queue is over-full.
+     */
+    get desiredSize(): number | null;
+    /**
+     * Enqueues the given chunk `chunk` in the readable side of the controlled transform stream.
+     */
+    enqueue(chunk: O): void;
+    /**
+     * Errors both the readable side and the writable side of the controlled transform stream, making all future
+     * interactions with it fail with the given error `e`. Any chunks queued for transformation will be discarded.
+     */
+    error(reason?: any): void;
+    /**
+     * Closes the readable side and errors the writable side of the controlled transform stream. This is useful when the
+     * transformer only needs to consume a portion of the chunks written to the writable side.
+     */
+    terminate(): void;
+}
+
+/**
+ * An underlying byte source for constructing a {@link ReadableStream}.
+ *
+ * @public
+ */
+export declare interface UnderlyingByteSource {
+    /**
+     * {@inheritDoc UnderlyingSource.start}
+     */
+    start?: UnderlyingByteSourceStartCallback;
+    /**
+     * {@inheritDoc UnderlyingSource.pull}
+     */
+    pull?: UnderlyingByteSourcePullCallback;
+    /**
+     * {@inheritDoc UnderlyingSource.cancel}
+     */
+    cancel?: UnderlyingSourceCancelCallback;
+    /**
+     * Can be set to "bytes" to signal that the constructed {@link ReadableStream} is a readable byte stream.
+     * This ensures that the resulting {@link ReadableStream} will successfully be able to vend BYOB readers via its
+     * {@link ReadableStream.(getReader:1) | getReader()} method.
+     * It also affects the controller argument passed to the {@link UnderlyingByteSource.start | start()}
+     * and {@link UnderlyingByteSource.pull | pull()} methods.
+     */
+    type: 'bytes';
+    /**
+     * Can be set to a positive integer to cause the implementation to automatically allocate buffers for the
+     * underlying source code to write into. In this case, when a consumer is using a default reader, the stream
+     * implementation will automatically allocate an ArrayBuffer of the given size, so that
+     * {@link ReadableByteStreamController.byobRequest | controller.byobRequest} is always present,
+     * as if the consumer was using a BYOB reader.
+     */
+    autoAllocateChunkSize?: number;
+}
+
+/** @public */
+export declare type UnderlyingByteSourcePullCallback = (controller: ReadableByteStreamController) => void | PromiseLike<void>;
+
+/** @public */
+export declare type UnderlyingByteSourceStartCallback = (controller: ReadableByteStreamController) => void | PromiseLike<void>;
+
+/**
+ * An underlying sink for constructing a {@link WritableStream}.
+ *
+ * @public
+ */
+export declare interface UnderlyingSink<W = any> {
+    /**
+     * A function that is called immediately during creation of the {@link WritableStream}.
+     */
+    start?: UnderlyingSinkStartCallback;
+    /**
+     * A function that is called when a new chunk of data is ready to be written to the underlying sink. The stream
+     * implementation guarantees that this function will be called only after previous writes have succeeded, and never
+     * before {@link UnderlyingSink.start | start()} has succeeded or after {@link UnderlyingSink.close | close()} or
+     * {@link UnderlyingSink.abort | abort()} have been called.
+     *
+     * This function is used to actually send the data to the resource presented by the underlying sink, for example by
+     * calling a lower-level API.
+     */
+    write?: UnderlyingSinkWriteCallback<W>;
+    /**
+     * A function that is called after the producer signals, via
+     * {@link WritableStreamDefaultWriter.close | writer.close()}, that they are done writing chunks to the stream, and
+     * subsequently all queued-up writes have successfully completed.
+     *
+     * This function can perform any actions necessary to finalize or flush writes to the underlying sink, and release
+     * access to any held resources.
+     */
+    close?: UnderlyingSinkCloseCallback;
+    /**
+     * A function that is called after the producer signals, via {@link WritableStream.abort | stream.abort()} or
+     * {@link WritableStreamDefaultWriter.abort | writer.abort()}, that they wish to abort the stream. It takes as its
+     * argument the same value as was passed to those methods by the producer.
+     *
+     * Writable streams can additionally be aborted under certain conditions during piping; see the definition of the
+     * {@link ReadableStream.pipeTo | pipeTo()} method for more details.
+     *
+     * This function can clean up any held resources, much like {@link UnderlyingSink.close | close()}, but perhaps with
+     * some custom handling.
+     */
+    abort?: UnderlyingSinkAbortCallback;
+    type?: undefined;
+}
+
+/** @public */
+export declare type UnderlyingSinkAbortCallback = (reason: any) => void | PromiseLike<void>;
+
+/** @public */
+export declare type UnderlyingSinkCloseCallback = () => void | PromiseLike<void>;
+
+/** @public */
+export declare type UnderlyingSinkStartCallback = (controller: WritableStreamDefaultController) => void | PromiseLike<void>;
+
+/** @public */
+export declare type UnderlyingSinkWriteCallback<W> = (chunk: W, controller: WritableStreamDefaultController) => void | PromiseLike<void>;
+
+/**
+ * An underlying source for constructing a {@link ReadableStream}.
+ *
+ * @public
+ */
+export declare interface UnderlyingSource<R = any> {
+    /**
+     * A function that is called immediately during creation of the {@link ReadableStream}.
+     */
+    start?: UnderlyingSourceStartCallback<R>;
+    /**
+     * A function that is called whenever the stream’s internal queue of chunks becomes not full,
+     * i.e. whenever the queue’s desired size becomes positive. Generally, it will be called repeatedly
+     * until the queue reaches its high water mark (i.e. until the desired size becomes non-positive).
+     */
+    pull?: UnderlyingSourcePullCallback<R>;
+    /**
+     * A function that is called whenever the consumer cancels the stream, via
+     * {@link ReadableStream.cancel | stream.cancel()},
+     * {@link ReadableStreamDefaultReader.cancel | defaultReader.cancel()}, or
+     * {@link ReadableStreamBYOBReader.cancel | byobReader.cancel()}.
+     * It takes as its argument the same value as was passed to those methods by the consumer.
+     */
+    cancel?: UnderlyingSourceCancelCallback;
+    type?: undefined;
+}
+
+/** @public */
+export declare type UnderlyingSourceCancelCallback = (reason: any) => void | PromiseLike<void>;
+
+/** @public */
+export declare type UnderlyingSourcePullCallback<R> = (controller: ReadableStreamDefaultController<R>) => void | PromiseLike<void>;
+
+/** @public */
+export declare type UnderlyingSourceStartCallback<R> = (controller: ReadableStreamDefaultController<R>) => void | PromiseLike<void>;
+
+/**
+ * A writable stream represents a destination for data, into which you can write.
+ *
+ * @public
+ */
+export declare class WritableStream<W = any> {
+    constructor(underlyingSink?: UnderlyingSink<W>, strategy?: QueuingStrategy<W>);
+    /**
+     * Returns whether or not the writable stream is locked to a writer.
+     */
+    get locked(): boolean;
+    /**
+     * Aborts the stream, signaling that the producer can no longer successfully write to the stream and it is to be
+     * immediately moved to an errored state, with any queued-up writes discarded. This will also execute any abort
+     * mechanism of the underlying sink.
+     *
+     * The returned promise will fulfill if the stream shuts down successfully, or reject if the underlying sink signaled
+     * that there was an error doing so. Additionally, it will reject with a `TypeError` (without attempting to cancel
+     * the stream) if the stream is currently locked.
+     */
+    abort(reason?: any): Promise<void>;
+    /**
+     * Closes the stream. The underlying sink will finish processing any previously-written chunks, before invoking its
+     * close behavior. During this time any further attempts to write will fail (without erroring the stream).
+     *
+     * The method returns a promise that will fulfill if all remaining chunks are successfully written and the stream
+     * successfully closes, or rejects if an error is encountered during this process. Additionally, it will reject with
+     * a `TypeError` (without attempting to cancel the stream) if the stream is currently locked.
+     */
+    close(): Promise<undefined>;
+    /**
+     * Creates a {@link WritableStreamDefaultWriter | writer} and locks the stream to the new writer. While the stream
+     * is locked, no other writer can be acquired until this one is released.
+     *
+     * This functionality is especially useful for creating abstractions that desire the ability to write to a stream
+     * without interruption or interleaving. By getting a writer for the stream, you can ensure nobody else can write at
+     * the same time, which would cause the resulting written data to be unpredictable and probably useless.
+     */
+    getWriter(): WritableStreamDefaultWriter<W>;
+}
+
+/**
+ * Allows control of a {@link WritableStream | writable stream}'s state and internal queue.
+ *
+ * @public
+ */
+export declare class WritableStreamDefaultController<W = any> {
+    private constructor();
+    /**
+     * The reason which was passed to `WritableStream.abort(reason)` when the stream was aborted.
+     *
+     * @deprecated
+     *  This property has been removed from the specification, see https://github.com/whatwg/streams/pull/1177.
+     *  Use {@link WritableStreamDefaultController.signal}'s `reason` instead.
+     */
+    get abortReason(): any;
+    /**
+     * An `AbortSignal` that can be used to abort the pending write or close operation when the stream is aborted.
+     */
+    get signal(): AbortSignal;
+    /**
+     * Closes the controlled writable stream, making all future interactions with it fail with the given error `e`.
+     *
+     * This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying
+     * sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the
+     * normal lifecycle of interactions with the underlying sink.
+     */
+    error(e?: any): void;
+}
+
+/**
+ * A default writer vended by a {@link WritableStream}.
+ *
+ * @public
+ */
+export declare class WritableStreamDefaultWriter<W = any> {
+    constructor(stream: WritableStream<W>);
+    /**
+     * Returns a promise that will be fulfilled when the stream becomes closed, or rejected if the stream ever errors or
+     * the writer’s lock is released before the stream finishes closing.
+     */
+    get closed(): Promise<undefined>;
+    /**
+     * Returns the desired size to fill the stream’s internal queue. It can be negative, if the queue is over-full.
+     * A producer can use this information to determine the right amount of data to write.
+     *
+     * It will be `null` if the stream cannot be successfully written to (due to either being errored, or having an abort
+     * queued up). It will return zero if the stream is closed. And the getter will throw an exception if invoked when
+     * the writer’s lock is released.
+     */
+    get desiredSize(): number | null;
+    /**
+     * Returns a promise that will be fulfilled when the desired size to fill the stream’s internal queue transitions
+     * from non-positive to positive, signaling that it is no longer applying backpressure. Once the desired size dips
+     * back to zero or below, the getter will return a new promise that stays pending until the next transition.
+     *
+     * If the stream becomes errored or aborted, or the writer’s lock is released, the returned promise will become
+     * rejected.
+     */
+    get ready(): Promise<undefined>;
+    /**
+     * If the reader is active, behaves the same as {@link WritableStream.abort | stream.abort(reason)}.
+     */
+    abort(reason?: any): Promise<void>;
+    /**
+     * If the reader is active, behaves the same as {@link WritableStream.close | stream.close()}.
+     */
+    close(): Promise<void>;
+    /**
+     * Releases the writer’s lock on the corresponding stream. After the lock is released, the writer is no longer active.
+     * If the associated stream is errored when the lock is released, the writer will appear errored in the same way from
+     * now on; otherwise, the writer will appear closed.
+     *
+     * Note that the lock can still be released even if some ongoing writes have not yet finished (i.e. even if the
+     * promises returned from previous calls to {@link WritableStreamDefaultWriter.write | write()} have not yet settled).
+     * It’s not necessary to hold the lock on the writer for the duration of the write; the lock instead simply prevents
+     * other producers from writing in an interleaved manner.
+     */
+    releaseLock(): void;
+    /**
+     * Writes the given chunk to the writable stream, by waiting until any previous writes have finished successfully,
+     * and then sending the chunk to the underlying sink's {@link UnderlyingSink.write | write()} method. It will return
+     * a promise that fulfills with undefined upon a successful write, or rejects if the write fails or stream becomes
+     * errored before the writing process is initiated.
+     *
+     * Note that what "success" means is up to the underlying sink; it might indicate simply that the chunk has been
+     * accepted, and not necessarily that it is safely saved to its ultimate destination.
+     */
+    write(chunk: W): Promise<void>;
+}
+
+export { }
diff --git a/node_modules/web-streams-polyfill/dist/types/tsdoc-metadata.json b/node_modules/web-streams-polyfill/dist/types/tsdoc-metadata.json
new file mode 100644
index 0000000..e86846c
--- /dev/null
+++ b/node_modules/web-streams-polyfill/dist/types/tsdoc-metadata.json
@@ -0,0 +1,11 @@
+// This file is read by tools that parse documentation comments conforming to the TSDoc standard.
+// It should be published with your NPM package.  It should not be tracked by Git.
+{
+  "tsdocVersion": "0.12",
+  "toolPackages": [
+    {
+      "packageName": "@microsoft/api-extractor",
+      "packageVersion": "7.13.4"
+    }
+  ]
+}
diff --git a/node_modules/web-streams-polyfill/es2018/package.json b/node_modules/web-streams-polyfill/es2018/package.json
new file mode 100644
index 0000000..878ab2d
--- /dev/null
+++ b/node_modules/web-streams-polyfill/es2018/package.json
@@ -0,0 +1,7 @@
+{
+  "name": "web-streams-polyfill-es2018",
+  "main": "../dist/polyfill.es2018",
+  "browser": "../dist/polyfill.es2018.min.js",
+  "module": "../dist/polyfill.es2018.mjs",
+  "types": "../dist/types/polyfill.d.ts"
+}
diff --git a/node_modules/web-streams-polyfill/es6/package.json b/node_modules/web-streams-polyfill/es6/package.json
new file mode 100644
index 0000000..ebdd02d
--- /dev/null
+++ b/node_modules/web-streams-polyfill/es6/package.json
@@ -0,0 +1,7 @@
+{
+  "name": "web-streams-polyfill-es6",
+  "main": "../dist/polyfill.es6",
+  "browser": "../dist/polyfill.es6.min.js",
+  "module": "../dist/polyfill.es6.mjs",
+  "types": "../dist/types/polyfill.d.ts"
+}
diff --git a/node_modules/web-streams-polyfill/package.json b/node_modules/web-streams-polyfill/package.json
new file mode 100644
index 0000000..af3208a
--- /dev/null
+++ b/node_modules/web-streams-polyfill/package.json
@@ -0,0 +1,76 @@
+{
+  "name": "web-streams-polyfill",
+  "version": "3.2.1",
+  "description": "Web Streams, based on the WHATWG spec reference implementation",
+  "main": "dist/polyfill",
+  "browser": "dist/polyfill.min.js",
+  "module": "dist/polyfill.mjs",
+  "types": "dist/types/polyfill.d.ts",
+  "typesVersions": {
+    ">=3.6": {
+      "dist/types/*": [
+        "dist/types/ts3.6/*"
+      ]
+    }
+  },
+  "scripts": {
+    "test": "npm run test:types && npm run test:unit && npm run test:wpt",
+    "test:wpt": "node --expose_gc ./test/run-web-platform-tests.js",
+    "pretest:wpt": "git submodule update --init --recursive",
+    "test:types": "tsc -p ./test/types/tsconfig.json",
+    "test:unit": "jasmine --config=test/unit/jasmine.json",
+    "lint": "eslint \"src/**/*.ts\"",
+    "build": "npm run build:bundle && npm run build:types",
+    "build:bundle": "rollup -c",
+    "build:types": "tsc --project . --emitDeclarationOnly --declarationDir ./lib && api-extractor run && node ./build/downlevel-dts.js",
+    "accept:types": "tsc --project . --emitDeclarationOnly --declarationDir ./lib && api-extractor run --local && node ./build/downlevel-dts.js",
+    "prepare": "npm run build"
+  },
+  "files": [
+    "dist",
+    "es6",
+    "es2018",
+    "ponyfill"
+  ],
+  "engines": {
+    "node": ">= 8"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/MattiasBuelens/web-streams-polyfill.git"
+  },
+  "keywords": [
+    "streams",
+    "whatwg",
+    "polyfill"
+  ],
+  "author": "Mattias Buelens <mattias@buelens.com>",
+  "contributors": [
+    "Diwank Singh <diwank.singh@gmail.com>"
+  ],
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/MattiasBuelens/web-streams-polyfill/issues"
+  },
+  "homepage": "https://github.com/MattiasBuelens/web-streams-polyfill#readme",
+  "devDependencies": {
+    "@microsoft/api-extractor": "^7.13.4",
+    "@rollup/plugin-inject": "^4.0.2",
+    "@rollup/plugin-replace": "^2.4.2",
+    "@rollup/plugin-strip": "^2.0.0",
+    "@rollup/plugin-typescript": "^8.2.1",
+    "@types/node": "^14.14.37",
+    "@typescript-eslint/eslint-plugin": "^4.21.0",
+    "@typescript-eslint/parser": "^4.21.0",
+    "@ungap/promise-all-settled": "^1.1.2",
+    "eslint": "^7.23.0",
+    "jasmine": "^3.7.0",
+    "micromatch": "^4.0.2",
+    "rollup": "^2.44.0",
+    "rollup-plugin-terser": "^7.0.2",
+    "ts-morph": "^10.0.2",
+    "tslib": "^2.2.0",
+    "typescript": "^4.2.4",
+    "wpt-runner": "^3.2.1"
+  }
+}
diff --git a/node_modules/web-streams-polyfill/ponyfill/es2018/package.json b/node_modules/web-streams-polyfill/ponyfill/es2018/package.json
new file mode 100644
index 0000000..3d73b0b
--- /dev/null
+++ b/node_modules/web-streams-polyfill/ponyfill/es2018/package.json
@@ -0,0 +1,6 @@
+{
+  "name": "web-streams-ponyfill-es2018",
+  "main": "../../dist/ponyfill.es2018",
+  "module": "../../dist/ponyfill.es2018.mjs",
+  "types": "../../dist/types/polyfill.d.ts"
+}
diff --git a/node_modules/web-streams-polyfill/ponyfill/es6/package.json b/node_modules/web-streams-polyfill/ponyfill/es6/package.json
new file mode 100644
index 0000000..d74a94a
--- /dev/null
+++ b/node_modules/web-streams-polyfill/ponyfill/es6/package.json
@@ -0,0 +1,6 @@
+{
+  "name": "web-streams-ponyfill-es6",
+  "main": "../../dist/ponyfill.es6",
+  "module": "../../dist/ponyfill.es6.mjs",
+  "types": "../../dist/types/polyfill.d.ts"
+}
diff --git a/node_modules/web-streams-polyfill/ponyfill/package.json b/node_modules/web-streams-polyfill/ponyfill/package.json
new file mode 100644
index 0000000..384e4dd
--- /dev/null
+++ b/node_modules/web-streams-polyfill/ponyfill/package.json
@@ -0,0 +1,6 @@
+{
+  "name": "web-streams-ponyfill",
+  "main": "../dist/ponyfill",
+  "module": "../dist/ponyfill.mjs",
+  "types": "../dist/types/polyfill.d.ts"
+}
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..46d5e1f
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,99 @@
+{
+  "name": "css-key-concepts-responsive-design",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "dependencies": {
+        "node-fetch": "^3.3.2"
+      }
+    },
+    "node_modules/data-uri-to-buffer": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/data-uri-to-buffer/-/data-uri-to-buffer-4.0.1.tgz",
+      "integrity": "sha512-0R9ikRb668HB7QDxT1vkpuUBtqc53YyAwMwGeUFKRojY/NWKvdZ+9UYtRfGmhqNbRkTSVpMbmyhXipFFv2cb/A==",
+      "engines": {
+        "node": ">= 12"
+      }
+    },
+    "node_modules/fetch-blob": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/fetch-blob/-/fetch-blob-3.2.0.tgz",
+      "integrity": "sha512-7yAQpD2UMJzLi1Dqv7qFYnPbaPx7ZfFK6PiIxQ4PfkGPyNyl2Ugx+a/umUonmKqjhM4DnfbMvdX6otXq83soQQ==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/jimmywarting"
+        },
+        {
+          "type": "paypal",
+          "url": "https://paypal.me/jimmywarting"
+        }
+      ],
+      "dependencies": {
+        "node-domexception": "^1.0.0",
+        "web-streams-polyfill": "^3.0.3"
+      },
+      "engines": {
+        "node": "^12.20 || >= 14.13"
+      }
+    },
+    "node_modules/formdata-polyfill": {
+      "version": "4.0.10",
+      "resolved": "https://registry.npmjs.org/formdata-polyfill/-/formdata-polyfill-4.0.10.tgz",
+      "integrity": "sha512-buewHzMvYL29jdeQTVILecSaZKnt/RJWjoZCF5OW60Z67/GmSLBkOFM7qh1PI3zFNtJbaZL5eQu1vLfazOwj4g==",
+      "dependencies": {
+        "fetch-blob": "^3.1.2"
+      },
+      "engines": {
+        "node": ">=12.20.0"
+      }
+    },
+    "node_modules/node-domexception": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/node-domexception/-/node-domexception-1.0.0.tgz",
+      "integrity": "sha512-/jKZoMpw0F8GRwl4/eLROPA3cfcXtLApP0QzLmUT/HuPCZWyB7IY9ZrMeKw2O/nFIqPQB3PVM9aYm0F312AXDQ==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/jimmywarting"
+        },
+        {
+          "type": "github",
+          "url": "https://paypal.me/jimmywarting"
+        }
+      ],
+      "engines": {
+        "node": ">=10.5.0"
+      }
+    },
+    "node_modules/node-fetch": {
+      "version": "3.3.2",
+      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-3.3.2.tgz",
+      "integrity": "sha512-dRB78srN/l6gqWulah9SrxeYnxeddIG30+GOqK/9OlLVyLg3HPnr6SqOWTWOXKRwC2eGYCkZ59NNuSgvSrpgOA==",
+      "dependencies": {
+        "data-uri-to-buffer": "^4.0.0",
+        "fetch-blob": "^3.1.4",
+        "formdata-polyfill": "^4.0.10"
+      },
+      "engines": {
+        "node": "^12.20.0 || ^14.13.1 || >=16.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/node-fetch"
+      }
+    },
+    "node_modules/web-streams-polyfill": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/web-streams-polyfill/-/web-streams-polyfill-3.2.1.tgz",
+      "integrity": "sha512-e0MO3wdXWKrLbL0DgGnUV7WHVuw9OUvL4hjgnPkIeEvESk74gAITi5G606JtZPp39cd8HA9VQzCIvA49LpPN5Q==",
+      "engines": {
+        "node": ">= 8"
+      }
+    }
+  },
+  "scripts": {
+    "sass-build": "sass/main.scss stylesheets/main.css"
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..1797372
--- /dev/null
+++ b/package.json
@@ -0,0 +1,5 @@
+{
+  "dependencies": {
+    "node-fetch": "^3.3.2"
+  }
+}
diff --git a/sass/card.scss b/sass/card.scss
new file mode 100644
index 0000000..21a8113
--- /dev/null
+++ b/sass/card.scss
@@ -0,0 +1,59 @@
+.card {
+    padding: 2%;
+    margin: 0;
+    flex-grow: 1;
+    flex-basis: 100%;
+    position: sticky;
+
+    &--color {
+        color: var(--dark);
+        @include on-dark-mode {
+            color: var(--light); 
+        }
+    }
+
+    &--color:nth-child(1),
+    &--color:nth-child(8), &--color:nth-child(9), &--color:nth-child(10),
+    &--color:nth-child(11),&--color:nth-child(12),&--color:nth-child(13) {
+        color: var(--light);
+    }
+
+    @include respond-small {
+        flex-basis: calc(100 / 2 ) * 1%;
+    }
+
+    @include respond-medium {
+        flex-basis: calc(100 / 3 ) * 1%;
+    }
+
+    @include respond-large{
+        flex-basis: calc(100 / 4 ) * 1%;
+    }
+
+    @include respond-x-large{
+        flex-basis: calc(100 / 5 ) * 1%;
+    }
+
+    &__image {
+       width: 90%;
+       margin: 3% 5%;
+       padding: 0;
+       max-height: 100%;
+    @include green-shadow;
+    }
+
+    &__cat-name {   
+        @extend %card-heading;
+    }
+    &__species {   
+        @extend %card-text;
+    }
+    &__origin {   
+        @extend %card-text;
+    }
+    &__temperament {   
+        @extend %card-text;
+    }
+}
+
+
diff --git a/sass/main.scss b/sass/main.scss
new file mode 100644
index 0000000..4cb3ab9
--- /dev/null
+++ b/sass/main.scss
@@ -0,0 +1,4 @@
+@import "style";
+@import "nav";
+@import "page";
+@import "card";
\ No newline at end of file
diff --git a/sass/nav.scss b/sass/nav.scss
new file mode 100644
index 0000000..dd1843d
--- /dev/null
+++ b/sass/nav.scss
@@ -0,0 +1,115 @@
+.navbar {
+    position: sticky;
+    align-items: left;
+    margin: 0;
+    padding: 0;
+    flex-wrap: wrap;
+    justify-content: center;
+    z-index: 1000;
+    max-height:fit-content;
+
+    @include respond-medium { 
+        flex-wrap: unset;
+        width: 100%;
+        display: flex;
+    }
+
+    &--style {
+      background-color: var(--yellow-orange);
+      @include on-dark-mode {
+        background-color: var(--dark);
+        color: var(--orange);
+      }
+    }
+
+    &__list {
+      list-style: none;
+      flex-direction: column;
+      position: fixed;
+      top:0;
+      left: 0;
+      z-index: 1000;
+      padding: 3%;
+      display: none;
+      width: 100%;
+      margin: 0;
+      line-height: 3rem;
+
+      @include respond-medium { 
+        padding: 0;
+        flex-direction: row;
+        position: relative;
+        justify-content:space-evenly;
+        display: flex;
+      }
+
+      &--style {
+        font-family: "BenchNine-Bold";
+        background-color: var(--yellow-orange);
+        @include on-dark-mode {
+          background-color: var(--dark);
+        }
+      }
+    }
+
+    &__item {
+      margin: 0;
+      padding: 0;
+    }
+  
+    &__anchor {
+      text-decoration: none;
+      font-size: 2.4rem;
+      word-break:keep-all;
+      cursor: pointer;
+
+      @include respond-medium { 
+        font-size: 2.4rem;
+      }
+
+      &--style {
+        color: var(--red-purple);
+        @include on-dark-mode {
+          color: var(--yellow-orange);
+        }
+      }
+
+      &--style:hover {
+        color: var(--purple);
+        @include on-dark-mode {
+          color: var(--yellow-green);
+        }
+      }
+      
+    }
+  
+    &__element {
+      margin: 0;
+      padding: 0;
+      position: sticky;
+      font-size: 3rem;
+      cursor: pointer;
+      line-height: 3.6rem;
+
+      @include respond-medium { 
+        width: 100%;
+      }
+
+      &--burger {
+        color: var(--red-purple);
+        margin-left: 2%;
+
+        @include on-dark-mode {
+            color: var(--orange);
+          }
+
+        @include respond-medium { 
+          display: none;
+        }
+      }
+    }
+
+    &__element:hover &__list {
+      display: flex;
+    }
+  }
\ No newline at end of file
diff --git a/sass/page.scss b/sass/page.scss
new file mode 100644
index 0000000..37b5b13
--- /dev/null
+++ b/sass/page.scss
@@ -0,0 +1,100 @@
+.page {
+    box-sizing: border-box;
+    margin: 0;
+    padding: 0;
+
+    &__intro {
+        display: flex;
+        justify-content: space-evenly;
+        margin: 0;
+        padding: 0;
+        flex-flow: wrap;
+        align-items: stretch;
+        flex-direction: row;
+        flex-wrap: wrap;
+    }
+
+    &__heading {   
+        margin: 0;
+        padding: 2%;
+        font-size: 4rem;
+        text-align: left;
+        flex-basis: 100%;
+        box-sizing: border-box;
+
+        @include respond-medium {
+            text-align: center;
+            flex-basis: 70%;
+            font-size: 8rem;
+        }
+        
+        &--style {
+            background-color: var(--yellow);
+            color: var(--red-purple);
+            font-family: "BenchNine-Bold";
+            @include on-dark-mode {
+                background-color: var(--red-purple);
+                color: var(--yellow-green);
+            }
+        }
+    }
+
+    &__sub-heading { 
+        margin: 0;
+        padding: 3%;
+        font-size: 3rem;
+        text-align: left;
+        flex-basis: 100%;
+        box-sizing: border-box;
+
+        @include respond-medium {
+            text-align: center;
+            flex-basis: 30%;
+            font-size: 4rem;
+        }
+
+        &--style {
+            color: var(--purple);
+            background-color: var(--yellow-green);
+            font-family: "BenchNine-Regular";
+            @include on-dark-mode {
+            background-color: var(--purple);
+            color: var(--yellow-green);
+            }
+        }
+    }
+
+    &__text {    
+        margin: 0;
+        padding: 2%;
+        font-size: 2rem;
+        display: none;
+        flex-basis: 100%;
+        box-sizing: border-box;
+
+        &--style {
+            color: var(--yellow);
+            background-color: var(--green-blue);
+            font-family: "BenchNine-Regular";
+            @include on-dark-mode {
+                background-color: var(--dark);
+                color: var(--orange);
+                }
+        }
+
+        @include respond-small {
+            display: block;
+        }
+    }
+    &__container {
+        display: flex;
+        justify-content: space-evenly;
+        margin: 0;
+        padding: 0;
+        flex-flow: wrap;
+        align-items: stretch;
+        flex-direction: row;
+        flex-wrap: wrap;
+        box-sizing: border-box;
+    }
+}
\ No newline at end of file
diff --git a/sass/style.scss b/sass/style.scss
new file mode 100644
index 0000000..e7a039d
--- /dev/null
+++ b/sass/style.scss
@@ -0,0 +1,104 @@
+@use 'sass:color';
+
+:root {
+    --light: #E7ECEF;
+    --dark: #272932;
+    --purple: #8601AF;
+    --red-purple: #C21460;
+    --blue: #0247FE;
+    --green-blue: #347C98;
+    --red-orange: #FC600A;
+    --orange: #FB9902;
+    --yellow-orange: #FCCC1A;
+    --yellow: #FEFE33;
+    --yellow-green: #B2D732;
+}
+
+/* Font: BenchNine[Font].
+"https://fonts.googleapis.com/css2?family=BenchNine:wght@300;400;700&display=swap";
+Accessed 23/10/23 */
+@font-face {
+  font-family: "BenchNine-Bold";
+  src: url("../fonts/BenchNine-Bold.ttf");
+}
+@font-face {
+  font-family: "BenchNine-Regular";
+  src: url("../fonts/BenchNine-Regular.ttf");
+}
+
+    $colour-wheel: (
+    "red" :#FE2712,
+    "red-orange": #FC600A,
+    "orange": #FB9902,
+    "yellow-orange": #FCCC1A,
+    "yellow": #FEFE33,
+    "yellow-green": #B2D732,
+    "green": #66B032,
+	  "green-blue": #347C98,
+  	"blue": #0247FE,
+    "blue-purple":#4424D6,
+    "purple": #8601AF,
+    "red-purple": #C21460
+    );
+
+    @mixin on-dark-mode {
+      @media (prefers-color-scheme: dark) {
+        html[data-theme="auto"] & {
+          @content;
+        }
+      }
+      html[data-theme="dark"] & {
+        @content;
+      }
+    }
+
+    @each $name, $hex in $colour-wheel {
+        .card--#{$name} {
+          background-color: $hex;
+
+          @include on-dark-mode {
+            background-color: color.change($hex, $blackness: 46%); 
+          }
+      }
+    }
+
+
+  @mixin respond-small {
+    @media (min-width: 600px) { @content };
+  }
+
+  @mixin respond-medium {
+    @media (min-width: 768px) { @content };
+  }
+
+  @mixin respond-large {
+    @media (min-width: 992px) { @content };
+  }
+
+  @mixin respond-x-large {
+    @media (min-width: 1200px) { @content };
+  }
+
+  @mixin green-shadow {
+    border: 1px solid var(--coral);
+    box-shadow: 3px 3px 5px var(--dark), 7px 7px 5px var(--green-blue), 3px 3px 2px var(--yellow-green);
+    border-radius: 5%;
+  }
+
+  %card-info {
+    margin: 1%;
+    padding: 1%;
+    font-family: "BenchNine-Bold";
+    text-align: center;
+    text-wrap:wrap;
+  }
+
+  %card-heading {
+    @extend %card-info;
+    font-size: 2.5rem;
+  }
+
+  %card-text {
+    @extend %card-info;
+    font-size: 1.6rem;
+  }
\ No newline at end of file
diff --git a/script.js b/script.js
index 0fd29c1..36ba1e6 100644
--- a/script.js
+++ b/script.js
@@ -1,132 +1,146 @@
-const cats= [
+const cats = [
     {
         "name" : "Little Miss Purrfect",
         "species" : "Cat",
         "favFoods" : ["wet food", "dry food"],
         "birthYear" : 2016,
-        "photo" : "https://learnwebcode.github.io/json-example/images/cat-2.jpg"
     },
     {
         "name" : "Mr Gwumpy",
         "species" : "Cat",
         "favFoods" : ["caviar"],
-        "birthYear" : 2016,
-        "photo" : "https://cdn.cnn.com/cnnnext/dam/assets/190517103414-01-grumpy-cat-file-restricted.jpg"
+        "birthYear" : 2016
     },
     {
         "name" : "Dopey",
         "species" : "Cat",
         "favFoods" : ["bugs"],
-        "birthYear" : 2018,
-        "photo" : "https://i1.wp.com/katzenworld.co.uk/wp-content/uploads/2019/06/funny-cat.jpeg?fit=1920%2C1920&ssl=1"
+        "birthYear" : 2018
     },
     {
         "name" : "Jumpy",
         "species" : "Scaredy Cat",
         "favFoods" : ["not cucumbers!"],
-        "birthYear" : 2008,
-        "photo" : "https://i.ytimg.com/vi/eX2qFMC8cFo/maxresdefault.jpg"
+        "birthYear" : 2008
     },
     {
         "name" : "Meowsalot",
         "species" : "Cat",
         "favFoods" : ["tuna", "catnip", "celery"],
-        "birthYear" : 2012,
-        "photo" : "https://learnwebcode.github.io/json-example/images/cat-1.jpg"
+        "birthYear" : 2012
     },
     {
         "name" : "Cindy Clawford",
         "species" : "Cat",
         "favFoods" : ["mice"],
-        "birthYear" : 2012,
-        "photo" : "https://icatcare.org/app/uploads/2018/07/Thinking-of-getting-a-cat.png"
+        "birthYear" : 2012
     },
     {
         "name" : "Katy Purry",
         "species" : "Cat",
         "favFoods" : ["cigarettes", "coffee"],
-        "birthYear" : 2015,
-        "photo" : "https://www.rd.com/wp-content/uploads/2021/03/GettyImages-1183822926.jpg"
+        "birthYear" : 2015
     },
     {
         "name" : "Dr. Von Belly-Rub",
         "species" : "Cat",
         "favFoods" : ["salt"],
-        "birthYear" : 2020,
-        "photo" : "https://images.theconversation.com/files/350865/original/file-20200803-24-50u91u.jpg?ixlib=rb-1.1.0&q=45&auto=format&w=1200&h=1200.0&fit=crop"
+        "birthYear" : 2020
     },
     {
         "name" : "Blobby",
         "species" : "Bird?",
         "favFoods" : ["your soul"],
-        "birthYear" : 2020,
-        "photo" : "https://www.top13.net/wp-content/uploads/2015/10/perfectly-timed-cat-photos-funny-cover.jpg"
+        "birthYear" : 2020
     },
     {
         "name" : "El Taco",
         "species" : "Cat",
         "favFoods" : ["tequila", "bar snax"],
-        "birthYear" : 1995,
-        "photo" : "https://i.imgflip.com/mh1vd.jpg"
+        "birthYear" : 1995
     },
     {
         "name" : "Nibbles",
         "species" : "Hungry Cat",
         "favFoods" : ["blankets", "feet", "tinsel"],
-        "birthYear" : 2003,
-        "photo" : "https://i.pinimg.com/736x/1b/ef/b5/1befb5723f54627768e1d77642ca4d45.jpg"
+        "birthYear" : 2003
     },
     {
         "name" : "BoopySnoot",
         "species" : "Tiny Cat",
         "favFoods" : ["milk"],
-        "birthYear" : 2021,
-        "photo" : "https://i.ytimg.com/vi/ZKBlMWI6nO4/maxresdefault.jpg"
+        "birthYear" : 2021
     },
     {
         "name" : "Tiger",
         "species" : "Fearsome Cat",
         "favFoods" : ["anything that moves", "anything else"],
-        "birthYear" : 2020,
-        "photo" : "https://static.onecms.io/wp-content/uploads/sites/47/2021/04/13/kitten-pounce-158906394-2000.jpg"
+        "birthYear" : 2020
     },
     {
         "name" : "Smushi",
         "species" : "Sushi Cat",
         "favFoods" : ["ramen"],
-        "birthYear" : 2000,
-        "photo" : "https://www.mythirtyspot.com/wp-content/uploads/2014/09/Screen-Shot-2014-09-18-at-10.19.29-PM-1024x712.png"
+        "birthYear" : 2000
     },
+        
     {
         "name" : "Doughnut",
         "species" : "Party Cat",
         "favFoods" : ["mushrooms"],
-        "birthYear" : 2014,
-        "photo" : "https://rlv.zcache.co.uk/doughnut_cat_pet_cat_kitten_cat_cute_cats_postcard-rdef91d9c144140c5b6ac0b9516085db9_ucbjp_540.jpg"
+        "birthYear" : 2014
     },
     {
         "name" : "Blep",
         "species" : "Cat",
         "favFoods" : ["baked bean juice"],
-        "birthYear" : 2016,
-        "photo" : "https://metro.co.uk/wp-content/uploads/2020/05/PRI_150473631-e1588316954238.jpg?quality=90&strip=all"
-    }
+        "birthYear" : 2016}
 
 ];
 
+async function fetchData(apiEndPoint) {
+  const response = await fetch(apiEndPoint);
+  try {
+    const json = await response.json();
+    return json;
+  } catch {
+    console.log(error);
+  }
+}
+
+const showCats = async (catApi) => {
+    const petImage = document.getElementsByClassName("card__image");
+    const species = document.getElementsByClassName("card__species");
+    const persona = document.getElementsByClassName("card__temperament");
+    const country = document.getElementsByClassName("card__origin");
+    const myCats = await fetchData(catApi);
+    for (let i = 0; i < myCats.length; i++) {
+        const {url, breeds} = myCats[i];
+        petImage[i].src = url;  
+        const {name, temperament, origin} = breeds[0];
+        petImage[i].alt = `Photo of ${name} breed of cat`;
+        species[i].innerText = `Species: ${name}`;
+        country[i].innerText = `Origin: ${origin}`;
+        persona[i].innerText = `Temperament: ${temperament}`;
+    }
+};
+const catApi = "https://api.thecatapi.com/v1/images/search?limit=16&has_breeds=1&api_key=live_7z9YrvTvX0vWxVWX3X4YlwaaLlPMavr2XgxFb9TuucYnRVzsORry3ScJo6W33Uft";
+showCats(catApi);
+
 (function () {
-    const petNames = document.getElementsByClassName("cat-name") 
-    const petImage = document.getElementsByClassName("pet-pic") 
-    const favFoods = document.getElementsByClassName("fav-foods")
-    const birthYear = document.getElementsByClassName("birth-year")
-    const species = document.getElementsByClassName("species")
+    const card = document.getElementsByClassName("card")
+    const petNames = document.getElementsByClassName("card__cat-name") 
+    const colourWheel = ["red", "red-orange", "orange", "yellow-orange",
+    "yellow", "yellow-green", "green", "green-blue", 
+    "blue", "blue-purple", "purple", "red-purple"];
 
     for (let i = 0; i < cats.length; i++) {
+        const colIndex = i%colourWheel.length;
+        card[i].classList.add(`card--${colourWheel[colIndex]}`);
+        card[i].classList.add("card--mode");
+        card[i].classList.add("card--color");
+        card[i].id = cats[i].name.toLowerCase();
         petNames[i].innerText = cats[i].name;
-        petImage[i].src = cats[i].photo;
-        favFoods[i].innerText = `Favourite foods: ${(cats[i].favFoods.map(food => food)).join(', ')}`
-        birthYear[i].innerText = `Birth Year: ${cats[i].birthYear}`
-        species[i].innerText = `Species: ${cats[i].species}`
     }
 })();
 
diff --git a/stylesheets/main.css b/stylesheets/main.css
new file mode 100644
index 0000000..d195e2a
--- /dev/null
+++ b/stylesheets/main.css
@@ -0,0 +1,487 @@
+:root {
+  --light: #E7ECEF;
+  --dark: #272932;
+  --purple: #8601AF;
+  --red-purple: #C21460;
+  --blue: #0247FE;
+  --green-blue: #347C98;
+  --red-orange: #FC600A;
+  --orange: #FB9902;
+  --yellow-orange: #FCCC1A;
+  --yellow: #FEFE33;
+  --yellow-green: #B2D732;
+}
+
+/* Font: BenchNine[Font].
+"https://fonts.googleapis.com/css2?family=BenchNine:wght@300;400;700&display=swap";
+Accessed 23/10/23 */
+@font-face {
+  font-family: "BenchNine-Bold";
+  src: url("../fonts/BenchNine-Bold.ttf");
+}
+@font-face {
+  font-family: "BenchNine-Regular";
+  src: url("../fonts/BenchNine-Regular.ttf");
+}
+.card--red {
+  background-color: #FE2712;
+}
+@media (prefers-color-scheme: dark) {
+  html[data-theme=auto] .card--red {
+    background-color: #8a1d12;
+  }
+}
+html[data-theme=dark] .card--red {
+  background-color: #8a1d12;
+}
+
+.card--red-orange {
+  background-color: #FC600A;
+}
+@media (prefers-color-scheme: dark) {
+  html[data-theme=auto] .card--red-orange {
+    background-color: #8a370a;
+  }
+}
+html[data-theme=dark] .card--red-orange {
+  background-color: #8a370a;
+}
+
+.card--orange {
+  background-color: #FB9902;
+}
+@media (prefers-color-scheme: dark) {
+  html[data-theme=auto] .card--orange {
+    background-color: #8a5402;
+  }
+}
+html[data-theme=dark] .card--orange {
+  background-color: #8a5402;
+}
+
+.card--yellow-orange {
+  background-color: #FCCC1A;
+}
+@media (prefers-color-scheme: dark) {
+  html[data-theme=auto] .card--yellow-orange {
+    background-color: #8a721a;
+  }
+}
+html[data-theme=dark] .card--yellow-orange {
+  background-color: #8a721a;
+}
+
+.card--yellow {
+  background-color: #FEFE33;
+}
+@media (prefers-color-scheme: dark) {
+  html[data-theme=auto] .card--yellow {
+    background-color: #8a8a33;
+  }
+}
+html[data-theme=dark] .card--yellow {
+  background-color: #8a8a33;
+}
+
+.card--yellow-green {
+  background-color: #B2D732;
+}
+@media (prefers-color-scheme: dark) {
+  html[data-theme=auto] .card--yellow-green {
+    background-color: #768a32;
+  }
+}
+html[data-theme=dark] .card--yellow-green {
+  background-color: #768a32;
+}
+
+.card--green {
+  background-color: #66B032;
+}
+@media (prefers-color-scheme: dark) {
+  html[data-theme=auto] .card--green {
+    background-color: #568a32;
+  }
+}
+html[data-theme=dark] .card--green {
+  background-color: #568a32;
+}
+
+.card--green-blue {
+  background-color: #347C98;
+}
+@media (prefers-color-scheme: dark) {
+  html[data-theme=auto] .card--green-blue {
+    background-color: #34728a;
+  }
+}
+html[data-theme=dark] .card--green-blue {
+  background-color: #34728a;
+}
+
+.card--blue {
+  background-color: #0247FE;
+}
+@media (prefers-color-scheme: dark) {
+  html[data-theme=auto] .card--blue {
+    background-color: #02278a;
+  }
+}
+html[data-theme=dark] .card--blue {
+  background-color: #02278a;
+}
+
+.card--blue-purple {
+  background-color: #4424D6;
+}
+@media (prefers-color-scheme: dark) {
+  html[data-theme=auto] .card--blue-purple {
+    background-color: #36248a;
+  }
+}
+html[data-theme=dark] .card--blue-purple {
+  background-color: #36248a;
+}
+
+.card--purple {
+  background-color: #8601AF;
+}
+@media (prefers-color-scheme: dark) {
+  html[data-theme=auto] .card--purple {
+    background-color: #69018a;
+  }
+}
+html[data-theme=dark] .card--purple {
+  background-color: #69018a;
+}
+
+.card--red-purple {
+  background-color: #C21460;
+}
+@media (prefers-color-scheme: dark) {
+  html[data-theme=auto] .card--red-purple {
+    background-color: #8a1447;
+  }
+}
+html[data-theme=dark] .card--red-purple {
+  background-color: #8a1447;
+}
+
+.card__temperament, .card__origin, .card__species, .card__cat-name {
+  margin: 1%;
+  padding: 1%;
+  font-family: "BenchNine-Bold";
+  text-align: center;
+  text-wrap: wrap;
+}
+
+.card__cat-name {
+  font-size: 2.5rem;
+}
+
+.card__temperament, .card__origin, .card__species {
+  font-size: 1.6rem;
+}
+
+.navbar {
+  position: sticky;
+  align-items: left;
+  margin: 0;
+  padding: 0;
+  flex-wrap: wrap;
+  justify-content: center;
+  z-index: 1000;
+  max-height: fit-content;
+}
+@media (min-width: 768px) {
+  .navbar {
+    flex-wrap: unset;
+    width: 100%;
+    display: flex;
+  }
+}
+.navbar--style {
+  background-color: var(--yellow-orange);
+}
+@media (prefers-color-scheme: dark) {
+  html[data-theme=auto] .navbar--style {
+    background-color: var(--dark);
+    color: var(--orange);
+  }
+}
+html[data-theme=dark] .navbar--style {
+  background-color: var(--dark);
+  color: var(--orange);
+}
+.navbar__list {
+  list-style: none;
+  flex-direction: column;
+  position: fixed;
+  top: 0;
+  left: 0;
+  z-index: 1000;
+  padding: 3%;
+  display: none;
+  width: 100%;
+  margin: 0;
+  line-height: 3rem;
+}
+@media (min-width: 768px) {
+  .navbar__list {
+    padding: 0;
+    flex-direction: row;
+    position: relative;
+    justify-content: space-evenly;
+    display: flex;
+  }
+}
+.navbar__list--style {
+  font-family: "BenchNine-Bold";
+  background-color: var(--yellow-orange);
+}
+@media (prefers-color-scheme: dark) {
+  html[data-theme=auto] .navbar__list--style {
+    background-color: var(--dark);
+  }
+}
+html[data-theme=dark] .navbar__list--style {
+  background-color: var(--dark);
+}
+.navbar__item {
+  margin: 0;
+  padding: 0;
+}
+.navbar__anchor {
+  text-decoration: none;
+  font-size: 2.4rem;
+  word-break: keep-all;
+  cursor: pointer;
+}
+@media (min-width: 768px) {
+  .navbar__anchor {
+    font-size: 2.4rem;
+  }
+}
+.navbar__anchor--style {
+  color: var(--red-purple);
+}
+@media (prefers-color-scheme: dark) {
+  html[data-theme=auto] .navbar__anchor--style {
+    color: var(--yellow-orange);
+  }
+}
+html[data-theme=dark] .navbar__anchor--style {
+  color: var(--yellow-orange);
+}
+.navbar__anchor--style:hover {
+  color: var(--purple);
+}
+@media (prefers-color-scheme: dark) {
+  html[data-theme=auto] .navbar__anchor--style:hover {
+    color: var(--yellow-green);
+  }
+}
+html[data-theme=dark] .navbar__anchor--style:hover {
+  color: var(--yellow-green);
+}
+.navbar__element {
+  margin: 0;
+  padding: 0;
+  position: sticky;
+  font-size: 3rem;
+  cursor: pointer;
+  line-height: 3.6rem;
+}
+@media (min-width: 768px) {
+  .navbar__element {
+    width: 100%;
+  }
+}
+.navbar__element--burger {
+  color: var(--red-purple);
+  margin-left: 2%;
+}
+@media (prefers-color-scheme: dark) {
+  html[data-theme=auto] .navbar__element--burger {
+    color: var(--orange);
+  }
+}
+html[data-theme=dark] .navbar__element--burger {
+  color: var(--orange);
+}
+@media (min-width: 768px) {
+  .navbar__element--burger {
+    display: none;
+  }
+}
+.navbar__element:hover .navbar__list {
+  display: flex;
+}
+
+.page {
+  box-sizing: border-box;
+  margin: 0;
+  padding: 0;
+}
+.page__intro {
+  display: flex;
+  justify-content: space-evenly;
+  margin: 0;
+  padding: 0;
+  flex-flow: wrap;
+  align-items: stretch;
+  flex-direction: row;
+  flex-wrap: wrap;
+}
+.page__heading {
+  margin: 0;
+  padding: 2%;
+  font-size: 4rem;
+  text-align: left;
+  flex-basis: 100%;
+  box-sizing: border-box;
+}
+@media (min-width: 768px) {
+  .page__heading {
+    text-align: center;
+    flex-basis: 70%;
+    font-size: 8rem;
+  }
+}
+.page__heading--style {
+  background-color: var(--yellow);
+  color: var(--red-purple);
+  font-family: "BenchNine-Bold";
+}
+@media (prefers-color-scheme: dark) {
+  html[data-theme=auto] .page__heading--style {
+    background-color: var(--red-purple);
+    color: var(--yellow-green);
+  }
+}
+html[data-theme=dark] .page__heading--style {
+  background-color: var(--red-purple);
+  color: var(--yellow-green);
+}
+.page__sub-heading {
+  margin: 0;
+  padding: 3%;
+  font-size: 3rem;
+  text-align: left;
+  flex-basis: 100%;
+  box-sizing: border-box;
+}
+@media (min-width: 768px) {
+  .page__sub-heading {
+    text-align: center;
+    flex-basis: 30%;
+    font-size: 4rem;
+  }
+}
+.page__sub-heading--style {
+  color: var(--purple);
+  background-color: var(--yellow-green);
+  font-family: "BenchNine-Regular";
+}
+@media (prefers-color-scheme: dark) {
+  html[data-theme=auto] .page__sub-heading--style {
+    background-color: var(--purple);
+    color: var(--yellow-green);
+  }
+}
+html[data-theme=dark] .page__sub-heading--style {
+  background-color: var(--purple);
+  color: var(--yellow-green);
+}
+.page__text {
+  margin: 0;
+  padding: 2%;
+  font-size: 2rem;
+  display: none;
+  flex-basis: 100%;
+  box-sizing: border-box;
+}
+.page__text--style {
+  color: var(--yellow);
+  background-color: var(--green-blue);
+  font-family: "BenchNine-Regular";
+}
+@media (prefers-color-scheme: dark) {
+  html[data-theme=auto] .page__text--style {
+    background-color: var(--dark);
+    color: var(--orange);
+  }
+}
+html[data-theme=dark] .page__text--style {
+  background-color: var(--dark);
+  color: var(--orange);
+}
+@media (min-width: 600px) {
+  .page__text {
+    display: block;
+  }
+}
+.page__container {
+  display: flex;
+  justify-content: space-evenly;
+  margin: 0;
+  padding: 0;
+  flex-flow: wrap;
+  align-items: stretch;
+  flex-direction: row;
+  flex-wrap: wrap;
+  box-sizing: border-box;
+}
+
+.card {
+  padding: 2%;
+  margin: 0;
+  flex-grow: 1;
+  flex-basis: 100%;
+  position: sticky;
+}
+.card--color {
+  color: var(--dark);
+}
+@media (prefers-color-scheme: dark) {
+  html[data-theme=auto] .card--color {
+    color: var(--light);
+  }
+}
+html[data-theme=dark] .card--color {
+  color: var(--light);
+}
+.card--color:nth-child(1), .card--color:nth-child(8), .card--color:nth-child(9), .card--color:nth-child(10), .card--color:nth-child(11), .card--color:nth-child(12), .card--color:nth-child(13) {
+  color: var(--light);
+}
+@media (min-width: 600px) {
+  .card {
+    flex-basis: 50%;
+  }
+}
+@media (min-width: 768px) {
+  .card {
+    flex-basis: 33.3333333333%;
+  }
+}
+@media (min-width: 992px) {
+  .card {
+    flex-basis: 25%;
+  }
+}
+@media (min-width: 1200px) {
+  .card {
+    flex-basis: 20%;
+  }
+}
+.card__image {
+  width: 90%;
+  margin: 3% 5%;
+  padding: 0;
+  max-height: 100%;
+  border: 1px solid var(--coral);
+  box-shadow: 3px 3px 5px var(--dark), 7px 7px 5px var(--green-blue), 3px 3px 2px var(--yellow-green);
+  border-radius: 5%;
+}
+
+/*# sourceMappingURL=main.css.map */
diff --git a/stylesheets/main.css.map b/stylesheets/main.css.map
new file mode 100644
index 0000000..ada8310
--- /dev/null
+++ b/stylesheets/main.css.map
@@ -0,0 +1 @@
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\ No newline at end of file