[BUG] Cannot pass functions or JSHandle into a component props in component testing

[segevfiner]

System info

• Playwright Version: v1.34.3
• Operating System: macOS 13.4
• Browser: Chromium
• Other info: Vue component testing

Source code

• I provided exact source code that allows reproducing the issue locally.

Config file

// playwright.config.ts
import { defineConfig, devices } from '@playwright/experimental-ct-vue';
import path from 'path';

/**
 * See https://playwright.dev/docs/test-configuration.
 */
export default defineConfig({
  testDir: './',
  testMatch: /.*(pw)\.(js|ts|mjs)/,
  /* The base directory, relative to the config file, for snapshot files created with toMatchSnapshot and toHaveScreenshot. */
  snapshotDir: './__snapshots__',
  /* Maximum time one test can run for. */
  timeout: 10 * 1000,
  /* Run tests in files in parallel */
  fullyParallel: true,
  /* Fail the build on CI if you accidentally left test.only in the source code. */
  forbidOnly: !!process.env.CI,
  /* Retry on CI only */
  retries: process.env.CI ? 2 : 0,
  /* Opt out of parallel tests on CI. */
  workers: process.env.CI ? 1 : undefined,
  /* Reporter to use. See https://playwright.dev/docs/test-reporters */
  reporter: 'html',
  /* Shared settings for all the projects below. See https://playwright.dev/docs/api/class-testoptions. */
  use: {
    /* Collect trace when retrying the failed test. See https://playwright.dev/docs/trace-viewer */
    trace: 'on-first-retry',

    /* Port to use for Playwright component endpoint. */
    ctPort: 3100,

    ctViteConfig: {
      resolve: {
        alias: {
          '@': path.join(__dirname, './src'),
        },
      },
    },
  },

  /* Configure projects for major browsers */
  projects: [
    {
      name: 'chromium',
      use: { ...devices['Desktop Chrome'] },
    },
    // {
    //   name: 'firefox',
    //   use: { ...devices['Desktop Firefox'] },
    // },
    // {
    //   name: 'webkit',
    //   use: { ...devices['Desktop Safari'] },
    // },
  ],
});

Test file (self-contained)

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

test('sample', async ({ page, mount }) => {
  const foo = () => 123;
  const bar = page.evaluateHandle(() => {
    return () => 123;
  });

  const component = await mount(Sample, {
    props: {
      foo,
      bar,
    },
  });
});

Steps

• Run the test

Expected

I can pass a callback, an object containing callbacks or a JSHandle (So I can worry about the node vs browser differences myself via evaluateHandle as props.

Actual

Error: The mount function props are not JSON serializable.

[mxschmitt]

This is not supported, we recommend creating a wrapper component if you need to supply custom data to your Component which you are testing.

[segevfiner]

But can it be supported? At least with a JSHandle?

[mxschmitt]

I'll make a feature request out of it, but there are currently no plans to do so.