---
url: /reference/api/TypeAlias.PackageType.md
---
# Type Alias: PackageType

```ts
type PackageType = 'module' | 'commonjs' | undefined
```

Defined in: [src/utils/package.ts:26](https://github.com/rolldown/tsdown/blob/0b9e1b84d330eca0bab63e4713dc35b26cc535c3/src/utils/package.ts#L26)