# HydrationRefTypeId

Runtime symbol exposing hydration metadata on a hydrated RefSubject.

## Signatures

```ts
export declare const HydrationRefTypeId: unique symbol;
```

```ts
export type HydrationRefTypeId = typeof HydrationRefTypeId;
```

## Why

Provides the runtime key that exposes a hydrated ref's serialization and restoration metadata
without changing its RefSubject prototype.

## Ownership and lifetime

This declaration acquires no resources. Effects represented by the contract retain their own
services and Scope requirements.