fix: [#1538] Always return Promise<Blob> from ClipboardItem.getType() (…

…#1539)

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

packages/happy-dom/src/clipboard/ClipboardItem.ts

@@ -43,12 +43,15 @@ export default class ClipboardItem {
 	 * @param type Type.
 	 * @returns Data.
 	 */
-	public async getType(type: string): Promise<Blob | string> {
+	public async getType(type: string): Promise<Blob> {
 		if (!this.#data[type]) {
 			throw new DOMException(
 				`Failed to execute 'getType' on 'ClipboardItem': The type '${type}' was not found`
 			);
 		}
-		return this.#data[type];
+		if (this.#data[type] instanceof Blob) {
+			return this.#data[type];
+		}
+		return new Blob([await this.#data[type]], { type });
 	}
 }

packages/happy-dom/test/clipboard/Clipboard.test.ts

@@ -37,11 +37,9 @@ describe('Clipboard', () => {
 
 			for (const item of data) {
 				const data = await item.getType(item.types[0]);
-				if (typeof data === 'string') {
-					text += data;
-				} else {
-					text += await data.text();
-				}
+				expect(data).toBeInstanceOf(Blob);
+
+				text += await data.text();
 			}
 
 			expect(text).toBe('test-a<b>test-b</b>test-ctest-dtest-e');