Add toString attempt

Author: laghee

injected/integration-test/web-compat.spec.js

@@ -130,6 +130,16 @@ test.describe('Ensure Notification interface is injected', () => {
             return window.Notification.maxActions;
         });
         expect(maxActionsPropDenied).toEqual(2);
+
+        const notificationToString = await page.evaluate(() => {
+            return window.Notification.toString();
+        });
+        expect(notificationToString).toEqual('function Notification() { [native code] }');
+
+        const requestPermissionToString = await page.evaluate(() => {
+            return window.Notification.requestPermission.toString();
+        });
+        expect(requestPermissionToString).toEqual('function requestPermission() { [native code] }');
     });
 });
 

injected/src/features/web-compat.js

@@ -202,6 +202,14 @@ export class WebCompat extends ContentFeature {
             configurable: true,
             enumerable: false,
         });
+
+        this.defineProperty(/** @type {any} */ (window.Notification), 'toString', {
+            value: () => 'function Notification() { [native code] }',
+            writable: false,
+            configurable: false,
+            enumerable: false,
+        });
+        
         // window.Notification polyfill is intentionally incompatible with DOM lib types
         this.defineProperty(/** @type {any} */ (window.Notification), 'requestPermission', {
             value: () => {
@@ -212,6 +220,13 @@ export class WebCompat extends ContentFeature {
             enumerable: true,
         });
 
+        this.defineProperty(/** @type {any} */ (window.Notification).requestPermission, 'toString', {
+            value: () => 'function requestPermission() { [native code] }',
+            writable: false,
+            configurable: false,
+            enumerable: false,
+        });
+
         this.defineProperty(/** @type {any} */ (window.Notification), 'permission', {
             get: () => 'denied',
             configurable: true,