extending specific services to child class in angular 4

Question

If I want to use services in child class then I have to add those services in parent class also and this results in the availability of those services to all the child classes of that parent class . How o restrict this in Angular 4

Answer 1

Try injecting the service using the providers array inside the declaration itself. For example, you can inject a service called MyService inside AppComponent in the below manner.

Hope it helps.

@Component({
  selector: 'my-app',
  providers: [MyService]
})
export class AppComponent { }

For a simple example, please refer to https://v4.angular.io/api/core/Directive#providers