Add es2015-es2020 polyfills

Author: ije

bundler/polyfills/es2015/fetch.ts

@@ -1 +1,5 @@
-import './fetch.ts'
+import nameShim from 'https://esm.sh/function.prototype.name/shim'
+
+import '../es2016/mod.ts'
+
+nameShim()

bundler/polyfills/es2015/mod.ts

@@ -0,0 +1,8 @@
+// Array#includes is stage 4, in ES7/ES2016
+import includesShim from 'https://esm.sh/array-includes/shim'
+
+import '../es2017/mod.ts'
+
+includesShim()
+
+

bundler/polyfills/es2016/mod.ts

@@ -0,0 +1,18 @@
+// Object.values/Object.entries are stage 4, in ES2017
+import valuesShim from 'https://esm.sh/object.values/shim'
+import entriesShim from 'https://esm.sh/object.entries/shim'
+
+// String#padStart/String#padEnd are stage 4, in ES2017
+import padstartShim from 'https://esm.sh/string.prototype.padstart/shim'
+import padendShim from 'https://esm.sh/string.prototype.padend/shim'
+
+// Object.getOwnPropertyDescriptors is stage 4, in ES2017
+import getownpropertydescriptorsShim from 'https://esm.sh/object.getownpropertydescriptors/shim'
+
+import '../es2018/mod.ts'
+
+valuesShim()
+entriesShim()
+padstartShim()
+padendShim()
+getownpropertydescriptorsShim()

bundler/polyfills/es2017/mod.ts

@@ -0,0 +1,6 @@
+import finallyShim from 'https://esm.sh/promise.prototype.finally/shim'
+import '../es2019/mod.ts'
+
+if (typeof Promise === 'function') {
+  finallyShim()
+}

bundler/polyfills/es2018/mod.ts

@@ -0,0 +1,10 @@
+import flatShim from 'https://esm.sh/array.prototype.flat/shim'
+import flatmapShim from 'https://esm.sh/array.prototype.flatmap/shim'
+import descriptionShim from 'https://esm.sh/symbol.prototype.description/shim'
+import fromentriesShim from 'https://esm.sh/object.fromentries/shim'
+import '../es2020/mod.ts'
+
+flatShim()
+flatmapShim()
+descriptionShim()
+fromentriesShim()

bundler/polyfills/es2019/mod.ts

@@ -0,0 +1,7 @@
+import matchallShim from 'https://esm.sh/string.prototype.matchall/shim'
+import globalthisShim from 'https://esm.sh/globalthis/shim'
+import allsettledShim from 'https://esm.sh/promise.allsettled/shim'
+
+matchallShim()
+globalthisShim()
+allsettledShim()