[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) › UppercasedString

```ts
const UppercasedString: uppercased(String);
```

Defined in: [packages/common/src/Type.ts:6382](https://github.com/evoluhq/evolu/blob/ecbac001e0c18bbc45b44715f49ecc3a768c5ec9/packages/common/src/Type.ts#L6382)

Validates uppercased text as TypeScript's `Uppercase<string>`.

Checks the whole string using JavaScript's Unicode uppercase mapping. Empty
strings and uncased characters, such as digits and emoji, are valid. Use
[uppercase](https://evolu.dev/docs/api-reference/common/Type/functions/uppercase) to produce an uppercased value from any string.

### Example

```ts

const text: UppercasedString = "HELLO WORLD";
assertOk(UppercasedString.fromUnknown(text), text);
assertErr(UppercasedString.fromUnknown("Hello world"));
assertOk(UppercasedString.fromUnknown(""), "");
```