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MagicMirror/.github/CONTRIBUTING.md
Kristjan ESPERANTO 462abf7027 [tests] migrate from jest to vitest (#3940) 
This is a big change, but I think it's a good move, as `vitest` is much
more modern than `jest`.

I'm excited about the UI watch feature (run `npm run test:ui`), for
example - it's really helpful and saves time when debugging tests. I had
to adjust a few tests because they had time related issues, but
basically we are now testing the same things - even a bit better and
less flaky (I hope).

What do you think?
2025-11-03 19:47:01 +01:00

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Contribution Policy for MagicMirror²

Thanks for contributing to MagicMirror²!

We hold our code to standard, and these standards are documented below.

Linters

We use prettier for automatic formatting a lot all our files. The configuration is in our prettier.config.mjs file.

To run prettier, use node --run lint:prettier.

JavaScript: Run ESLint

We use ESLint to lint our JavaScript files. The configuration is in our eslint.config.mjs file.

To run ESLint, use node --run lint:js.

CSS: Run StyleLint

We use StyleLint to lint our CSS. The configuration is in our stylelint.config.mjs file.

To run StyleLint, use node --run lint:css.

Markdown: Run markdownlint

We use markdownlint-cli2 to lint our markdown files. The configuration is in our .markdownlint.json file.

To run markdownlint, use node --run lint:markdown.

Testing

We use Vitest for JavaScript testing.

To run all tests, use node --run test.

The package.json scripts expose finer-grained test commands:

  • test:unit – run unit tests only
  • test:e2e – execute browser-driven end-to-end tests
  • test:electron – launch the Electron-based regression suite
  • test:coverage – collect coverage while running every suite
  • test:watch – keep Vitest in watch mode for fast local feedback
  • test:ui – open the Vitest UI dashboard (needs OS file-watch support enabled)
  • test:calendar – run the legacy calendar debug helper
  • test:css, test:markdown, test:prettier, test:spelling, test:js – lint-only scripts that enforce formatting, spelling, markdown style, and ESLint.

You can invoke any script with node --run <script> (or npm run <script>). Individual files can still be targeted directly, e.g. npx vitest run tests/e2e/env_spec.js.