__metadata should register function that returns type instead of literal type

Imagine case with circular dependencies

class Car {
  @Field owner: Person // !!! Error: Person is not defined.
}

class Person {
  @Field car: Car;
}

// car has owner, owner has car

Typescript metadata would be emitted here like

eg.
__metadata('design:type', Person).

As Person is injected for the first time before Person class is initialized, it will result with ReferenceError saying Person is not defined.

If it'd emit metadata like:
__metadata('design:type', () => Person)

it'd be fine.

Later on, when using Reflect.metadata, it would also need to call meta function instead of just returning the type.

If you think it's good idea, do you have any suggestions about starting point for PR that would implement this change?

Beginne damit, den TypeScript-Compilerpfad nachzuverfolgen, der Decorator-Metadaten ausgibt, und untersuche dann, wie Reflect.metadata den ausgegebenen Wert verarbeitet. Als erledigt gilt, wenn das zirkuläre Car/Person-Beispiel den Initialisierungs-ReferenceError vermeidet und Metadatenkonsumenten die verzögerte Typfunktion aufrufen; der Payload nennt keine Dateien oder Tests.