> 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)
- **CLI:** `-r=<path>`, `--root=<path>`

Specify the project root directory. Can be an absolute path, or a path relative to `process.cwd()`. `root` determines the starting point for loading configuration files, searching test files, etc.

Using `<rootDir>` in any path-based configuration settings will reference this value.

```ts title="rstest.config.ts"
import { defineConfig } from 'rstest';

export default defineConfig({
  setupFiles: ['<rootDir>/setup.js'],
  include: ['<rootDir>/**/*.{test,spec}.?(c|m)[jt]s?(x)'],
  root: './my-project',
});
```