Inherit Dependency injection

Question

I want to create a generic api service in order to make model-related services easier to create:

export abstract class ModelService {

    constructor(p         


        

Answer 1

The constructor needs to repeat the dependencies and then passed to the super class using super(...)

@Injectabe()
export class FooService extends ModelService{
    constructor(apiService: ApiService) {
      super(apiService);
        //ApiService is a service that wraps Http and adds signature , auth and serialization.
    }
}

This is not an Angular2 requirement or limitation, that's how constructors work in TypeScript.