[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › [Types](https://evolu.dev/docs/api-reference/common/Types) › ParameterIntersection

```ts
type ParameterIntersection<T> = [T] extends [(value: infer I) => void]
  ? I
  : unknown;
```

Defined in: [packages/common/src/Types.ts:477](https://github.com/evoluhq/evolu/blob/037c390af081e9944d616ff298a729515c5c5ab7/packages/common/src/Types.ts#L477)

Intersects the parameter types of a union of unary functions.