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

# EvalSourceMapDevToolPlugin

This plugin enables more fine grained control of source map generation. It is also enabled automatically by certain settings of the [`devtool`](/config/devtool.md) configuration option.

## Examples

### Basic use case

You can use the following code to replace the configuration option `devtool: eval-source-map` with an equivalent custom plugin configuration:

```js title="rspack.config.mjs"
import { rspack } from '@rspack/core';

export default {
  devtool: false,
  plugins: [new rspack.EvalSourceMapDevToolPlugin({})],
};
```

### Exclude vendor maps

The following code would exclude source maps for any modules in the `vendor.js` bundle:

```js
new rspack.EvalSourceMapDevToolPlugin({
  exclude: ['vendor.js'],
});
```

## Options

### test

- **Type:** `string` `RegExp` `[string, RegExp]`

Include source maps for modules based on their extension (defaults to `.js`, `.mjs`, and `.css`).

### include

- **Type:** `string` `RegExp` `[string, RegExp]`

Include source maps for module paths that match the given value.

### exclude

- **Type:** `string` `RegExp` `[string, RegExp]`

Exclude modules that match the given value from source map generation.

### append

- **Type:** `string | function`

Appends the given value to the original asset. Usually the `#sourceMappingURL` comment. `[url]` is replaced with a URL to the source map file. `false` disables the appending.

### module

- **Type:** `boolean`

Indicates whether loaders should generate source maps (defaults to `true`).

### columns

- **Type:** `boolean`

Indicates whether column mappings should be used (defaults to `true`).


This page is adapted from [webpack documentation](https://webpack.js.org/plugins/eval-source-map-dev-tool-plugin/) under the [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/), with modifications.