feat: support for web

[V3RON]

Description

Added support for web platform with all functionalities supported by the native equivalents, including UI testing capabilities.

See #40 for the initial implementation.

Context

The primary goal was to introduce Web platform support to react-native-harness, allowing developers to run the same harness tests on web browsers as they do on mobile. This was achieved by integrating Playwright as the underlying automation engine for web runners.

Summary of changes

• New Package: @react-native-harness/platform-web:
  • Implemented a web-specific platform runner.
  • Added helper factories for chromium, chrome, firefox, and webkit browser configurations.
• Playground app updates:
  • Added index.html and updated index.js to support web entry points via react-native-web.
  • Configured Metro for web compatibility (metro.config.js).
  • Updated rn-harness.config.mjs with web and chromium runners.
• Core logic enhancements:
  • Updated @react-native-harness/runtime and @react-native-harness/ui to handle web-specific constraints (e.g., disabling HMR on web, web-specific UI harness components).
• GitHub Action integration:
  • Created a dedicated GitHub Action (./actions/web) to streamline E2E testing in CI environments.
• Documentation:
  • Added a detailed README for the web platform package and updated the documentation website with configuration guides.

Testing

The changes were verified through both local and automated E2E testing:

1. Local testing:
   • The apps/playground project was used as the primary test bed.
   • Runners were tested in both headful (Chrome) and headless (Chromium) modes by running jest --selectProjects react-native-harness locally within the playground app.
2. E2E via GitHub Actions:
   • A new e2e-web job was added to the .github/workflows/e2e-tests.yml workflow.
   • This job automatically runs on ubuntu-22.04 for pull requests targeting main.
   • It executes the full harness test suite against a headless Chromium instance using the custom ./actions/web action.

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Project	Deployment	Review	Updated (UTC)
react-native-harness	Ready	Preview, Comment	Jan 22, 2026 0:40am