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fix: do not throw on removeListener without listener #15224

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merged 3 commits into from
Jun 29, 2022
Merged

fix: do not throw on removeListener without listener #15224

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9ba5a32
fix: do not throw on removeListener without listener
mxschmitt Jun 29, 2022
02a56aa
Update packages/playwright-core/src/client/joiningEventEmitter.ts
mxschmitt Jun 29, 2022
6b071ab
Update joiningEventEmitter.ts
mxschmitt Jun 29, 2022
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3 changes: 2 additions & 1 deletion packages/playwright-core/src/client/joiningEventEmitter.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -119,7 +119,8 @@ export class JoiningEventEmitter implements EventEmitter {
}

private _wrapper(listener: (...args: any[]) => void) {
return (listener as any)[wrapperListener];
// Fallback to original listener if not wrapped to ensure backwards compatibility Node.js's event emitter
return (listener as any)[wrapperListener] ?? listener;
}

private _original(wrapper: Function): Function {
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4 changes: 4 additions & 0 deletions tests/page/page-event-pageerror.spec.ts
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Expand Up @@ -128,3 +128,7 @@ it('should handle window', async ({ page, browserName, isElectron }) => {
]);
expect(error.message).toBe(browserName === 'chromium' ? 'Window' : '[object Window]');
});

it('should remove a listener of a non-existing event handler', async ({ page }) => {
page.removeListener('pageerror', () => {});
});