[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:299](https://github.com/evoluhq/evolu/blob/e7144e2bbe9069362b62dec1b64a8aa922b8f1b0/packages/common/src/Lookup.ts#L299)

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