In Angular 14, should an abstract base class with constructor dependencies be decorated with...

In an Angular 14 app, I have:

@Injectable()
export abstract class AbstractBaseService{
constructor(
protected override readonly serviceA: ServiceA,
protected override readonly serviceB: serviceB
) {
}
public abstract foo();

}


@Injectable()
export class ConcreteClass extends AbstractBaseService {

constructor(
protected override readonly serviceA: ServiceA,
protected override readonly serviceB: serviceB
) {
super(serviceA,serviceB,);
}
public foo(){
}
}


See the base class is declared as an abstract class, which means it cannot be instantiated directly. So should it have the Injectable() decorator?. If Yes, Why?

I removed @Injectable() from AbstractBaseService, and the app still works. Does this mean the decorator is optional? But LLMs are telling, that its ideal to have @Injectable() for the base class also. Hence the confusion.

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