Test Runner: Plugins

The test runner uses @web/dev-server to your test files to the browser. The dev server has many configuration options, a plugin system to do code transformations, and middleware to change the server's behavior.

We recommend reading these pages:

Plugins for a general overview
esbuild for TS, JSX and TSX
rollup for using rollup plugins
Writing plugins

Caught a mistake or want to contribute to the documentation? Edit this page on GitHub!