wokerService.ts

import { Injectable } from '@angular/core';
import { SwUpdate } from '@angular/service-worker';
import { interval } from 'rxjs';
import { MatSnackBar } from '@angular/material';

@Injectable()
export class WorkerService {

  constructor(public updates: SwUpdate, public snackBar: MatSnackBar) {
    // If updates are enabled
    if (updates.isEnabled) {
      // poll the service worker to check for updates
      interval(6 * 60 * 60).subscribe(() => updates.checkForUpdate());
    }
  }

  // Called from app.components.ts constructor
  public checkForUpdates() {
    if (this.updates.isEnabled) {
      this.updates.available.subscribe(event => {
        console.log('current version is', event.current);
        console.log('available version is', event.available);
        this.promptUser(event);
      });
      this.updates.activated.subscribe(event => {
        console.log('old version was', event.previous);
        console.log('new version is', event.current);
      });
    }    
  }

  // If there is an update, promt the user
  private promptUser(e): void {
    if(e.available) {
      let snackBarRef = this.snackBar.open(
        'A new version of the dashboard is available', 
        'Update',
        {horizontalPosition: 'left'}
      );
      snackBarRef.onAction().subscribe(() => document.location.reload());
    }
  }  

}

@Ratsela,

did you add the service worker itself to your project?

If not, try out " ng add @angular/pwa --project project-name "
This command will add the service-worker package to your project :)

For further information read the Angular-Getting started with service workers Guide: https://angular.io/guide/service-worker-getting-started

Hopefully I was able to help you :)

@michaeldoye

is there a way to look for changes in the app content?

In App A I have a vehicle list and each vehicle has a testset. If I add a testset to the vehicle and activate the testset in App B, I want to get informed about a new Testset in Vehicle XY in the App A. But I just get it work, when I change the code, not when the data in the app is changed.

Do you have an idea how i could reach this?