angular 7 forkJoin

gistfile1.txt

// See: https://www.learnrxjs.io/operators/combination/forkjoin.html
// Added take(1) bc of this behaviour: https://github.com/angular/angularfire2/issues/617#issuecomment-255513958
forkJoin(
  this.firebaseService.getUserEventsForDevice(selectedDevice.key, filterCriteria).pipe(take(1)),
  this.firebaseService.getEventsFromDevice(selectedDevice.key, filterCriteria).pipe(take(1))
)
.subscribe(
  ([userEvents, deviceEvents]) => {
    console.log('userEvents', userEvents);
    console.log('deviceEvents', deviceEvents);
  }
);