fix(core): only import typing from zone.js

Author: JiaLiPassion

src/core/angularfire2.ts

@@ -1,34 +1,40 @@
-import { InjectionToken, NgZone } from '@angular/core';
-import { Observable } from 'rxjs/Observable';
-import { Subscription } from 'rxjs/Subscription';
-import { queue } from 'rxjs/scheduler/queue';
-import { isPlatformServer } from '@angular/common';
-import { observeOn } from 'rxjs/operator/observeOn';
+import 'rxjs/add/operator/first';
 
+import {isPlatformServer} from '@angular/common';
+import {InjectionToken, NgZone} from '@angular/core';
 import firebase from '@firebase/app';
-import { FirebaseApp, FirebaseOptions } from '@firebase/app-types';
-
-import 'zone.js';
-import 'rxjs/add/operator/first';
+import {FirebaseApp, FirebaseOptions} from '@firebase/app-types';
+import {Observable} from 'rxjs/Observable';
+import {observeOn} from 'rxjs/operator/observeOn';
+import {queue} from 'rxjs/scheduler/queue';
+import {Subscription} from 'rxjs/Subscription';
+import {} from 'zone.js';
 
-export const FirebaseAppName = new InjectionToken<string>('angularfire2.appName');
-export const FirebaseAppConfig = new InjectionToken<FirebaseOptions>('angularfire2.config');
+export const FirebaseAppName =
+    new InjectionToken<string>('angularfire2.appName');
+export const FirebaseAppConfig =
+    new InjectionToken<FirebaseOptions>('angularfire2.config');
 
 // Put in database.ts when we drop database-depreciated
-export const RealtimeDatabaseURL = new InjectionToken<string>('angularfire2.realtimeDatabaseURL');
+export const RealtimeDatabaseURL =
+    new InjectionToken<string>('angularfire2.realtimeDatabaseURL');
 
 export class FirebaseZoneScheduler {
   constructor(public zone: NgZone, private platformId: Object) {}
   schedule(...args: any[]): Subscription {
-    return <Subscription>this.zone.runGuarded(function() { return queue.schedule.apply(queue, args)});
+    return <Subscription>this.zone.runGuarded(function() {
+      return queue.schedule.apply(queue, args)
+    });
   }
   // TODO this is a hack, clean it up
   keepUnstableUntilFirst<T>(obs$: Observable<T>) {
     if (isPlatformServer(this.platformId)) {
       return new Observable<T>(subscriber => {
         const noop = () => {};
-        const task = Zone.current.scheduleMacroTask('firebaseZoneBlock', noop, {}, noop, noop);
-        obs$.first().subscribe(() => this.zone.runOutsideAngular(() => task.invoke()));
+        const task = Zone.current.scheduleMacroTask(
+            'firebaseZoneBlock', noop, {}, noop, noop);
+        obs$.first().subscribe(
+            () => this.zone.runOutsideAngular(() => task.invoke()));
         return obs$.subscribe(subscriber);
       });
     } else {
@@ -39,11 +45,11 @@ export class FirebaseZoneScheduler {
     return new Observable<T>(subscriber => {
       return this.zone.runOutsideAngular(() => {
         return obs$.subscribe(
-          value => this.zone.run(() => subscriber.next(value)),
-          error => this.zone.run(() => subscriber.error(error)),
-          ()    => this.zone.run(() => subscriber.complete()),
+            value => this.zone.run(() => subscriber.next(value)),
+            error => this.zone.run(() => subscriber.error(error)),
+            () => this.zone.run(() => subscriber.complete()),
         );
       });
     });
   }
-}
+}