---
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/9f98be3c9c6627ed1c4e5bdec3d8a18e5463c4c8/src/utils/package.ts#L26)