takeUntil.ts

export class TestComponent {

  constructor(private store: Store) { }

  private componetDestroyed: Subject = new Subject();
  todos: Subscription;
  posts: Subscription;

  ngOnInit() {
     this.todosSubscription = this.store.select('todos').takeUntil(this.componetDestroyed).subscribe(console.log); 

     this.postsSubscription = this.store.select('posts').takeUntil(this.componetDestroyed).subscribe(console.log); 
  }

  ngOnDestroy() {
    this.componetDestroyed.next();
    this.componetDestroyed.complete();
  }

}