fetch: prefer global over lazy loading (nodejs#1793)

Author: KhafraDev

lib/fetch/body.js

@@ -16,8 +16,7 @@ const { File } = require('./file')
 const { StringDecoder } = require('string_decoder')
 const { parseMIMEType, serializeAMimeType } = require('./dataURL')
 
-/** @type {globalThis['ReadableStream']} */
-let ReadableStream
+let ReadableStream = globalThis.ReadableStream
 
 // https://fetch.spec.whatwg.org/#concept-bodyinit-extract
 function extractBody (object, keepalive = false) {

lib/fetch/index.js

@@ -61,8 +61,7 @@ const { webidl } = require('./webidl')
 
 /** @type {import('buffer').resolveObjectURL} */
 let resolveObjectURL
-/** @type {globalThis['ReadableStream']} */
-let ReadableStream
+let ReadableStream = globalThis.ReadableStream
 
 const nodeVersion = process.versions.node.split('.')
 const nodeMajor = Number(nodeVersion[0])

lib/fetch/request.js

@@ -29,7 +29,7 @@ const { URLSerializer } = require('./dataURL')
 const { kHeadersList } = require('../core/symbols')
 const assert = require('assert')
 
-let TransformStream
+let TransformStream = globalThis.TransformStream
 
 const kInit = Symbol('init')