[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) › StructuralScalar

```ts
type StructuralScalar = string | number | boolean | null | Uint8Array;
```

Defined in: [packages/common/src/Lookup.ts:237](https://github.com/evoluhq/evolu/blob/e7144e2bbe9069362b62dec1b64a8aa922b8f1b0/packages/common/src/Lookup.ts#L237)

Scalar branch shared by [StructuralKey](https://evolu.dev/docs/api-reference/common/Lookup/type-aliases/StructuralKey) and [Structural](https://evolu.dev/docs/api-reference/common/Lookup/type-aliases/Structural).