dnet-applications/frontends/dnet-is-application/src/app/app.component.ts

import { Component, inject } from '@angular/core';
import { TitleStrategy } from '@angular/router';
import { BreakpointObserver, Breakpoints } from '@angular/cdk/layout';
import { Observable } from 'rxjs';
import { map, shareReplay } from 'rxjs/operators';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  title = 'D-NET Information Service Application';
  
  isHandset$: Observable<boolean> = this.breakpointObserver.observe(Breakpoints.Handset)
  .pipe(
    map(result => result.matches),
    shareReplay()
  );

  constructor(private breakpointObserver: BreakpointObserver) {}

}