import { Component , OnInit , ViewEncapsulation } from '@angular/core' ; import { concat , fromEvent , interval , noop , observable , Observable , of , timer , merge , Subject , BehaviorSubject , AsyncSubject , ReplaySubject } from 'rxjs' ; import { delayWhen , filter , map , take , timeout } from 'rxjs/operators' ; import { createHttpObservable } from '../common/util' ; @ Component ( { selector : 'about' , templateUrl : './about.component.html' , styleUrls : [ './about.component.css' ] } ) export class AboutComponent implements OnInit { ngOnInit ( ) { } }