> For AI agents: the complete documentation index is available at /zh/llms.txt, the full documentation bundle is available at /zh/llms-full.txt.

# tools.cssLoader

- **类型：** `Object | Function`
- **默认值：**

```js
const defaultOptions = {
  modules: rsbuildConfig.output.cssModules,
  sourceMap: rsbuildConfig.output.sourceMap.css,
};
```

修改 [css-loader](https://github.com/webpack-contrib/css-loader) 的配置项。

:::info
该配置项的使用方式与 Rsbuild 完全一致。详细信息请参考 [Rsbuild - tools.cssLoader](https://v2.rsbuild.dev/zh/config/tools/css-loader)。
:::