Merge pull request capricorn86#541 from a-wing/master

add blob arrayBuffer()

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

@@ -110,6 +110,20 @@ export default class Blob implements IBlob {
 		return blob;
 	}
 
+
+	/**
+	 * Returns a Promise that resolves to a ArrayBuffer.
+	 *
+	 * @returns ArrayBuffer.
+	 */
+
+	// Reference:
+	// https://github.com/web-std/io/blob/c88170bf24f064adfbb3586a21fb76650ca5a9ab/packages/blob/src/blob.js#L139-L148
+	// https://stackoverflow.com/questions/8609289/convert-a-binary-nodejs-buffer-to-javascript-arraybuffer
+	public async arrayBuffer(): Promise<ArrayBuffer> {
+		return new Uint8Array(this._buffer).buffer
+	}
+
 	/**
 	 * Returns a Promise that resolves to a text.
 	 *

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

@@ -22,6 +22,20 @@ describe('Blob', () => {
 		});
 	});
 
+	// Reference:
+	// https://github.com/web-std/io/blob/c88170bf24f064adfbb3586a21fb76650ca5a9ab/packages/blob/test/blob.spec.js#L35-L44
+	describe('arrayBuffer()', () => {
+		it('Returns "Promise<ArrayBuffer>".', async () => {
+			const str = 'TEST';
+			const blob = new Blob([str]);
+			const buffer = await blob.arrayBuffer();
+			const result = new Uint8Array(buffer);
+			for (let i = 0; i < result.length; ++i) {
+				expect(result[i]).toBe(str[i].charCodeAt(0));
+			}
+		});
+	});
+
 	describe('toString()', () => {
 		it('Returns "[object Blob]".', () => {
 			const blob = new Blob(['TEST']);