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

# root

- **Type:** `string`
- **Default:** [process.cwd()](https://nodejs.org/api/process.html#processcwd)

Specify the project root directory. Can be an absolute path, or a path relative to `process.cwd()`.

The value of Rsbuild `root` is also passed to the [context](https://rspack.rs/config/context) configuration of Rspack.

:::tip
The value of `root` does not affect the path of the `.env` file, as the `.env` file is resolved before the Rsbuild configuration file.

Rsbuild CLI supports using the `--root` option to specify the root directory, which can affect the path of the `.env` file. See ["CLI"](/guide/basic/cli.md) for more details.
:::

## Example

- Relative path:

```ts title="rsbuild.config.ts"
export default {
  root: './foo',
};
```

- Absolute path:

```ts title="rsbuild.config.ts"
import { join } from 'node:path';

export default {
  root: join(__dirname, 'foo'),
};
```