Angular Resolver - NavigationStart and NavigationEnd

app.component.ts

import { Component, OnInit } from '@angular/core';
import { filter } from 'rxjs/operators';
import { NavigationEnd, NavigationStart, Router } from '@angular/router';

@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
})
export class AppComponent implements OnInit {
  isLoadingRoute: boolean = false;

  constructor(
    private router: Router,
  ) {}

  ngOnInit(): void {
    this.router.events.pipe(
      filter(e => e instanceof NavigationStart)
    ).subscribe(() => { this.isLoadingRoute = true });

    this.router.events.pipe(
      filter(e => e instanceof NavigationEnd)
    ).subscribe(() => { this.isLoadingRoute = false });
  }
}