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@Component({
  selector: 'app-posts-page',
  template: `
     <posts [posts]="posts$ | async"></posts>
  `
})
export class PostsPageComponent {
  constructor( private store : Store<any> ) {
    this.posts$ = store.select('posts');
  }

  @HostListener('document:scroll')
  @throttle()
  scroll() {
    console.log('scroll');
  }

}