ApplicationRef.isStable never goes to "true" when an instance of AngularFireAuth is injected

When AngularFireAuth is injected anywhere on the page, the ApplicationRef.isStable never emits true. This causes problems with latest @angular/service-worker, which relies on ApplicationRef.isStable to install the worker. This probably also would cause server-side rendering to timeout, but I didn’t test this.

Version info

Angular: 5.0.0

Firebase: 4.6.2

AngularFire: 5.0.0-rc4

How to reproduce these conditions

Inject AngularFireAuth into a component and subscribe to the ApplicationRef.isStable observable:

import { Component, ApplicationRef, ChangeDetectorRef } from '@angular/core';
import { AngularFireAuth } from 'angularfire2/auth';

@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: [ './app.component.css' ]
})
export class AppComponent  {
  constructor(appRef: ApplicationRef, af: AngularFireAuth) {    
    appRef.isStable.subscribe(s => {
      console.log(s); 
    });
  }
}

Here is a project that reproduces the problem: https://stackblitz.com/edit/angularfire2-appref-isstable

Expected behavior

The ApplicationRef.isStable observable should emit true shortly after application is loaded.

Actual behavior

The ApplicationRef.isStable observable emits only initial false value.

[deftomat]

The same issue when I injects AngularFirestore. We cannot use an @angular/service-worker as it is not registered due to this issue.

[patrickmichalina]

Any updates on this issue?