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

# Deprecated options

This page lists configuration options that have been deprecated in Rspack.

These options are kept for backward compatibility only and should not be used in new projects.

## experiments.css


Stability: Deprecated

- **Type:** `boolean`
- **Default:** `false`

:::warning Deprecated
This option is deprecated since Rspack 2.0. Users now need to manually add CSS rules to enable CSS support. In a future version, Rspack will automatically add CSS-related default rules.
:::

### Migration

To use CSS in Rspack 2.0, you need to manually add CSS rules to your configuration:

```js title="rspack.config.mjs"
export default {
  module: {
    rules: [
      {
        test: /\.css$/,
        type: 'css/auto',
      },
    ],
  },
};
```

### Legacy usage (deprecated)

```js title="rspack.config.mjs"
export default {
  experiments: {
    css: true,
  },
};
```

## experiments.incremental


Stability: Deprecated

This option has been moved to top-level [`incremental`](/config/incremental.md).

## rules\[].loaders

An array to pass the loader package name and its options.

:::warning
This option has been deprecated. Use [rules\[\].use](/config/module-rules.md#rulesuse) instead.
:::