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

```ts
type StructuralFunction = (...args: ReadonlyArray<unknown>) => unknown;
```

Defined in: [packages/common/src/Lookup.ts:327](https://github.com/evoluhq/evolu/blob/037c390af081e9944d616ff298a729515c5c5ab7/packages/common/src/Lookup.ts#L327)

Function branch excluded by [Structural](https://evolu.dev/docs/api-reference/common/Lookup/type-aliases/Structural).