angularfire2

forkJoin() requires all source Observables to emit at least once and to complete. This following demo completes as expected: const source = forkJoin( from([1,2,3]), from([9,8,7,6]) ).subscribe( x => console.log(‘GOT:’, x), err => console.log(‘Error:’, err), () => console.log(‘Completed’) ); Live demo: https://stackblitz.com/edit/rxjs-urhkni GOT: 3,6 Completed Jan 2019: Updated for RxJS 6