angularfire2.ts

import { InjectionToken, NgZone } from '@angular/core';
import { Subscription } from 'rxjs/Subscription';
import { Scheduler } from 'rxjs/Scheduler';
import { queue } from 'rxjs/scheduler/queue';

import firebase from '@firebase/app';
import { FirebaseApp, FirebaseOptions } from '@firebase/app-types';

export function firebaseAppFactory(config: FirebaseOptions, name?: string): FirebaseApp {
  const appName = name || '[DEFAULT]';
  const existingApp = firebase.apps.filter(app => app.name == appName)[0];
  return existingApp || firebase.initializeApp(config, appName);
}

export const FirebaseAppName = new InjectionToken<string>('angularfire2.appName');
export const FirebaseAppConfig = new InjectionToken<FirebaseOptions>('angularfire2.config');

// Put in database.ts when we dropped depreciated
export const RealtimeDatabaseURL = new InjectionToken<string>('angularfire2.realtimeDatabaseURL');


export class FirebaseZoneScheduler {
  constructor(public zone: NgZone) {}
  schedule(...args: any[]): Subscription {
    return <Subscription>this.zone.runGuarded(function() { return queue.schedule.apply(queue, args)});
  }
}