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

# output.tempDir

- **Type:** `string`
- **Default:** `''`

When developing or building a project, Modern.js generates real Rspack entries and HTML templates, placing them in a temporary directory.

If you want to start a project with multiple configurations at the same time, you can use this configuration to generate files in different temporary directories to avoid interference with each other.

The configuration can be a relative or absolute path, but paths outside the project should be avoided.

Example:

```ts
export default {
  output: {
    tempDir: path.join('node_modules', '.temp-dir'),
  },
};
```