yahasa

import { Component, OnInit, OnDestroy } from '@angular/core';
import { Router, NavigationStart, NavigationEnd } from '@angular/router';
import { Subscription } from 'rxjs';
import 'rxjs/add/operator/pairwise';

@Component({
  selector: 'app-root',
  template: `/* ... your template */`,
  styles: [`/* ... your styles */`]
})