Debug Mode#

Rsbuild provides a debug mode to troubleshoot problems, you can add the DEBUG=rsbuild environment variable when building to enable Rsbuild's debug mode.

# Debug in development mode
DEBUG=rsbuild pnpm dev

# Debug in production mode
DEBUG=rsbuild pnpm build

In debug mode, Rsbuild will output some additional log information, and write the Rsbuild config and Rspack config to the dist directory, which is convenient for developers to view and debug.

Log Information#

In debug mode, you will see some logs in the terminal starting with rsbuild, including internal operations performed by Rsbuild and the current version of Rspack being used.

$ DEBUG=rsbuild pnpm dev

  ...
  rsbuild init plugins
  rsbuild init plugins done
  rsbuild Use Rspack v1.0.0
  ...

In addition, the following logs will be output in the terminal, indicating that the Rsbuild has written the internally generated build configs to disk, and you can open these config files to view the corresponding content.

Inspect config succeeds, open following files to view the content:

   - Rsbuild Config: /Project/demo/dist/.rsbuild/rsbuild.config.mjs
   - Rspack Config (web): /Project/demo/dist/.rsbuild/rspack.config.web.mjs

Rsbuild Config File#

In debug mode, Rsbuild will automatically generate dist/.rsbuild/rsbuild.config.mjs file, which contains the final generated Rsbuild config. In this file, you can know the final result of the Rsbuild config you passed in after being processed by the framework and Rsbuild.

The structure of the file is as follows:

export default {
  dev: {
    // some configs...
  },
  source: {
    // some configs...
  },
  // other configs...
};

For a complete introduction to Rsbuild config, please see the Configure Rsbuild chapter.

Rspack Config File#

Rsbuild will also automatically generate dist/.rsbuild/rspack.config.web.mjs file, which contains the final generated Rspack config. In this file, you can see what is included in the config that Rsbuild finally passes to Rspack.

The structure of the file is as follows:

export default {
  resolve: {
    // some resolve configs...
  },
  module: {
    // some Rspack loaders...
  },
  plugins: [
    // some Rspack plugins...
  ],
  // other configs...
};

For a complete introduction to Rspack configs, please see Rspack official documentation.