Using DI for inputs

code.ts

@Component({
  selector: 'some-parent',
  providers: [
    { provide: INPUT1, deps: [SomeSmartParent], useFactory: (cmp) => cmp.input1$ }
  ]
})
export class SomeSmartParent {
    input1$ = this.store.select(...).map(...);
}
@Component({
  selector: 'some-child',
  changeDetection: ChangeDetectionStrategy.OnPush
})
export class SomeChildNoMatterHowDeep {
   constructor(private @Inject(INPUT1) input1$: Observable<any>);
}