DI simple application

di_simple_application.ts

@Component({
  selector: 'my-app',
  template: `<child></child>`,
})
export class AppComponent {}

@Component({
  selector: 'child',
  template: `<grand-child></grand-child>`
})
export class ChildComponent {}

@Component({
  selector: 'grand-child',
  template: `grand-child`
})
export class GrandChildComponent {
  constructor(private service: Service) {}
}

@NgModule({
  imports: [BrowserModule],
  declarations: [
    AppComponent, 
    ChildComponent, 
    GrandChildComponent
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }