---
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/7de10074d02924a2de03a1214386c7ccc448a326/src/utils/package.ts#L26)