import { IBeacon } from '@awesome-cordova-plugins/ibeacon/ngx';
constructor(private ibeacon: IBeacon) { }
...
this.ibeacon.requestAlwaysAuthorization();
let delegate = this.ibeacon.Delegate();
delegate.didRangeBeaconsInRegion()
  .subscribe(
    data => console.log('didRangeBeaconsInRegion: ', data),
    error => console.error()
  );
delegate.didStartMonitoringForRegion()
  .subscribe(
    data => console.log('didStartMonitoringForRegion: ', data),
    error => console.error()
  );
delegate.didEnterRegion()
  .subscribe(
    data => {
      console.log('didEnterRegion: ', data);
    }
  );
let beaconRegion = this.ibeacon.BeaconRegion('deskBeacon','F7826DA6-ASDF-ASDF-8024-BC5B71E0893E');
this.ibeacon.startMonitoringForRegion(beaconRegion)
  .then(
    () => console.log('Native layer received the request to monitoring'),
    error => console.error('Native layer failed to begin monitoring: ', error)
  );