### link · function

Create a link type wrapper for model relationships.

**Signature:** `{ <const T extends new (...args: any[]) => Model<any>>(TargetModel: T): TypeWrapper<InstanceType<T>>; <const T extends new (...args: any[]) => Model<any>>(TargetModel: () => T): TypeWrapper<...>; }`

**Type Parameters:**

- `T extends new (...args: any[]) => Model<any>` - The target model class.

**Parameters:**

- `TargetModel: T` - The model class this link points to.

**Returns:** A link type instance.

**Examples:**

```typescript
const Author = E.defineModel("Author", class {
  id = E.field(E.identifier);
  posts = E.field(E.array(E.link(() => Book)));
}, { pk: "id" });

const Book = E.defineModel("Book", class {
  id = E.field(E.identifier);
  author = E.field(E.link(Author));
}, { pk: "id" });
```