Angular 6 - can't resolve all parameters for AppComponent

Question

I am trying to build an application with Angular 6 and I am still setting everything up. But it seems there is something wrong with the dependency injection in my app.

Answer 1

@Inject did the trick for me

import {Component, Inject} from '@angular/core';
import {TestService} from "./TestService";

@Component({
  selector: 'sh-home',
  styleUrls: ['./home.scss'],
  templateUrl: './home.html'
})
export class HomeComponent {

  constructor(@Inject(TestService) testService: TestService) {
    testService.sayHello();
  }
}