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

```ts
function lessThan<Max>(
  max: ValidateBrandFactoryNumber<Max>,
): BrandFactory<`LessThan${Max}`, number, LessThanError<Max>>;
```

Defined in: [packages/common/src/Type.ts:6807](https://github.com/evoluhq/evolu/blob/f0109fb501a593010e858e39248dde1200eeb2d7/packages/common/src/Type.ts#L6807)

Number [Brand](https://evolu.dev/docs/api-reference/common/Brand/interfaces/Brand) requiring a value less than `max`.

### Example

```ts

const LessThanTen = lessThan(10)(Number);

assertOk(LessThanTen.fromUnknown(9), 9);
```