# uuid5

Derives a deterministic UUID version 5 from a UTF-8 name and 16-byte namespace.

## Signatures

```ts
export declare const uuid5: {
    (namespace: Uuid5Namespace): (name: string) => Effect.Effect<Uuid5, Cause.IllegalArgumentError>;
    (name: string, namespace: Uuid5Namespace): Effect.Effect<Uuid5, Cause.IllegalArgumentError>;
};
```

## Why

Determinism is exact for the same name bytes and namespace. Invalid namespace length fails in the typed channel with `IllegalArgumentError`; missing Web Crypto or a rejected SHA-1 digest is an Effect defect, not a typed error.

## Ownership and lifetime

Each Effect acquires no persistent resources, reads but does not retain the namespace, and uses Web Crypto `subtle.digest` for the invocation.

## Examples

```ts
import { uuid5, Uuid5Namespace } from "@typed/id/Uuid5"
const id = uuid5("example.com", Uuid5Namespace.DNS)
```