# isCuid

Tests whether a string is a valid branded CUID.

## Signatures

```ts
export declare const isCuid: (value: string) => value is Cuid;
```

## Why

Runtime refinement restores trust after JSON, structured clone, or other transport has erased the TypeScript brand.

## Ownership and lifetime

This pure predicate acquires no resources and retains no input.

## Examples

```ts
import { isCuid } from "@typed/id/Cuid"
isCuid("a00000000000000000000000")
```