[BUG] React component tests not passing Date prop values

[leiit]

System info

• Playwright Version: v1.41.0, 1.42.0-alpha-jan-17-2024
• Operating System: All
• Browser: All
• Other info: Works with v1.40.1 and below

Source code

const TestComponent = ({ date }: { date: Date }) => {
  console.log('date', date);

  return <span>{date.toLocaleDateString()}</span>;
};

export default TestComponent;

import { expect, test } from '@playwright/experimental-ct-react';
import TestComponent from './TestComponent';

test('can pass a Date object to the component', async ({ mount, page }) => {
  await mount(<TestComponent date={new Date('2000-06-01')} />);
  await expect(page.getByText('2000')).toBeInViewport();
});

Steps

• Run the test

Expected

Component renders, Date objects were passed from the runner to the browser environment prior to v1.41.0.

Actual

Empty object is passed from the runner.

[mxschmitt]

I can repro on ToT. Thanks for filing and providing the great test-case!