---
url: /api/reference/wxt/modules/functions/addViteConfig.md
---

[API](../../../packages.md) / [wxt/modules](../index.md) / addViteConfig

# Function: addViteConfig()

> **addViteConfig**(`wxt`, `viteConfig`): `void`

Source: [packages/wxt/src/modules/index.ts:109](https://github.com/wxt-dev/wxt/blob/a34b49d6b92f500ed9cb5ad4934510e834f49704/packages/wxt/src/modules/index.ts#L109)

Merge additional vite config for one or more entrypoint "groups" that make up
individual builds. Config in the project's `wxt.config.ts` file takes
precedence over any config added by this function.

## Parameters

### wxt

[`Wxt`](../../interfaces/Wxt.md)

The wxt instance provided by the module's setup function.

### viteConfig

(`env`) => `UserConfig` | `undefined`

A function that returns the vite config the module is
adding. Same format as `vite` in `wxt.config.ts`.

## Returns

`void`

## Example

```ts
export default defineWxtModule((wxt, options) => {
  addViteConfig(wxt, () => ({
  build: {
  sourceMaps: true,
  },
  });
  });
```

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