feat: [#1500] Adds support for Blob.stream() (#1500)

Co-authored-by: David Ortner <david@ortner.se>

packages/happy-dom/src/file/Blob.ts

@@ -1,4 +1,5 @@
 import { Buffer } from 'buffer';
+import { ReadableStream } from 'stream/web';
 import * as PropertySymbol from '../PropertySymbol.js';
 
 /**
@@ -136,6 +137,21 @@ export default class Blob {
 		return this[PropertySymbol.buffer].toString();
 	}
 
+	/**
+	 * Returns returns a ReadableStream which upon reading returns the data contained within the Blob.
+	 *
+	 * @returns ReadableStream
+	 */
+	public stream(): ReadableStream {
+		const buffer = this[PropertySymbol.buffer];
+		return new ReadableStream({
+			start(controller) {
+				controller.enqueue(buffer);
+				controller.close();
+			}
+		});
+	}
+
 	/**
 	 * Returns the object converted to string.
 	 *

packages/happy-dom/test/file/Blob.test.ts

@@ -38,6 +38,24 @@ describe('Blob', () => {
 		});
 	});
 
+	describe('stream()', () => {
+		it('Returns all data in a ReadableStream.', async () => {
+			const data = 'Test1Test2';
+			const blob = new Blob(['Test1', 'Test2']);
+			const stream = blob.stream();
+
+			let i = 0;
+			for await (const chunk of stream.values()) {
+				for (const value of chunk) {
+					expect(i).toBeLessThan(data.length);
+					expect(value).toBe(data[i].charCodeAt(0));
+					++i;
+				}
+			}
+			expect(i).toBe(data.length);
+		});
+	});
+
 	describe('toString()', () => {
 		it('Returns "[object Blob]".', () => {
 			const blob = new Blob(['TEST']);