import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';

import { AppComponent } from './app.component';
import { QsAngular2BusyModule } from 'qs-angular2-busy';


@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    BrowserAnimationsModule,
    QsAngular2BusyModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

import { Component } from '@angular/core';
import { QsAngular2BusyModule, BusyConfig } from 'qs-angular2-busy';

import { of } from 'rxjs';
import { delay } from 'rxjs/operators';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  title = 'app';  
  busy: Promise<any>;

  ngOnInit() {
    this.busy = AppComponent.PromiseDelay(2000);
  }

  public static PromiseDelay(timeout = 1000): Promise<any> {
    return of().pipe(delay(timeout)).toPromise();
  }
}