Angular inject service into base class but not in sub-class and use the parent service in sub-classes

Question

Using Angular 7 & Typescript: I have a base class that uses a lot of services and child classes (about 40 sub-class) and I don't want to add those services in all subclass constructor and pass them to super() but I still need to use those services in all subclass.

---

export class parentTool {

    constructor(type: string, public service1: Service1, public service2: Service2,public service3: Service3, public service4: Service4){}
}

export class ChildTool1 extends parentTool {

    constructor(public service1: Service1, public service2: Service2,public service3: Service3, public service4: Service4) {

        super("tool1", service1, service2, service3, service4);
    }
}

export class ChildTool2 extends parentTool {

    constructor(public service1: Service1, public service2: Service2,public service3: Service3, public service4: Service4) {

        super("tool2", service1, service2, service3, service4);
    }
}

Answer 1

I use to have the same problem so I end up doing manulay DI (dependency injection) by using injector service

this static class use to store a refrence of injector service

export class AppInjector {

  private static injector: Injector;

  static setInjector(injector: Injector) {
    AppInjector.injector = injector;
  }

  static getInjector(): Injector {
    return AppInjector.injector;
  }
}   

at app module I set the injoctor service

export class AppModule { 
  constructor(injector:Injector){
      AppInjector.setInjector(injector);// save a injector ref 💾
  }
}

you need to store the service before you start do any DI (dependency injection)

in the base component

export class BaseComponent {
  protected utilitiesService: UtilitiesService; // 👈 service
  protected loggingService: LoggingService; // 👈 service

  constructor() {

      const injector = AppInjector.getInjector();

      this.utilitiesService = injector.get(UtilitiesService); // 🌟 DI
      this.loggingService = injector.get(LoggingService); // 🌟 DI


  }

}

child class now have access to all service injected by the injector class 🎉🎉

    export class ChildComponent extends BaseComponent {
      constructor() {
        super();
      }
    }

demo 🔥🔥