app.component.ts

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss']
})
export class AppComponent implements OnInit{
  currentTodo = ""
  todos$: Observable<Todo[]>

  constructor(
    private todoQuery: TodoQuery,
    private actions$: Actions,
  ) {
  }

  ngOnInit() {
    this.actions$.dispatch(TodoActions.loadTodos())
    this.todos$ = this.todoQuery.selectAll$
  }
  ...