[Bug]: Incorrect source map sources when using SourceMapDevToolPlugin and CssExtractRspackPlugin

[chenjiahan]

System Info

@rspack/core 1.6.0-beta.1

Details

The generated source maps contains invalid sources when using SourceMapDevToolPlugin and CssExtractRspackPlugin together.

• Rspack config:

const config = {
  plugins: [
    new rspack.CssExtractRspackPlugin({}),
    new SourceMapDevToolPlugin({
      test: /\.css$/,
      filename: "[file].map",
      moduleFilenameTemplate: "[absolute-resource-path]",
    }),
  ],
};

• Source map generated by Rspack (not a valid absolute path):

{
  "sources": [
    "/rspack-repro-css-source-map-absolute-path/./src/render.css"
  ],
  // ...
}

• Source map generated by webpack:

{
  "sources": [
    "/rspack-repro-css-source-map-absolute-path/src/render.css"
  ],
  // ...
}

Reproduce link

https://github.com/chenjiahan/rspack-repro-css-source-map-absolute-path

Reproduce Steps

1. pnpm i
2. pnpm build:rspack
3. pnpm build:webpack