fix(afs): fix di warning (angular#1401)

Author: FrozenPandaz

src/firestore/enable-persistance-token.ts

@@ -0,0 +1,6 @@
+import { InjectionToken } from '@angular/core';
+
+/**
+ * The value of this token determines whether or not the firestore will have persistance enabled
+ */
+export const EnablePersistenceToken = new InjectionToken<boolean>('EnablePersistenceToken');

src/firestore/firestore.module.ts

@@ -1,36 +1,25 @@
-import { NgModule, InjectionToken } from '@angular/core';
+import { InjectionToken, ModuleWithProviders, NgModule } from '@angular/core';
 import { FirebaseApp, AngularFireModule } from 'angularfire2';
 import { AngularFirestore } from './firestore';
 import { from } from 'rxjs/observable/from';
 
-export const EnablePersistenceToken = new InjectionToken<boolean>('EnablePersistenceToken');
-
-export function _getAngularFirestore(app: FirebaseApp, enablePersistence: boolean) {
-  return new AngularFirestore(app, enablePersistence);
-}
-
-export const AngularFirestoreProvider = {
-  provide: AngularFirestore,
-  useFactory: _getAngularFirestore,
-  deps: [ FirebaseApp, EnablePersistenceToken ]
-};
-
-export const FIRESTORE_PROVIDERS = [
-  AngularFirestoreProvider,
-  { provide: EnablePersistenceToken, useValue: false },
-];
+import { EnablePersistenceToken } from './enable-persistance-token';
 
 @NgModule({
   imports: [ AngularFireModule ],
-  providers: [ FIRESTORE_PROVIDERS ]
+  providers: [
+    AngularFirestore,
+  ]
 })
 export class AngularFirestoreModule {
-  static enablePersistence() {
+  /**
+   * Attempt to enable persistent storage, if possible
+   */
+  static enablePersistence(): ModuleWithProviders {
     return {
-      ngModule: AngularFireModule,
+      ngModule: AngularFirestoreModule,
       providers: [
         { provide: EnablePersistenceToken, useValue: true },
-        AngularFirestoreProvider
       ]
     }
   }

src/firestore/firestore.spec.ts

@@ -79,3 +79,29 @@ describe('AngularFirestore', () => {
   });
 
 });
+
+describe('AngularFirestore without persistance', () => {
+  let app: FBApp;
+  let afs: AngularFirestore;
+
+  beforeEach(() => {
+    TestBed.configureTestingModule({
+      imports: [
+        AngularFireModule.initializeApp(COMMON_CONFIG),
+        AngularFirestoreModule
+      ]
+    });
+    inject([FirebaseApp, AngularFirestore], (_app: FBApp, _afs: AngularFirestore) => {
+      app = _app;
+      afs = _afs;
+    })();
+  });
+
+  it('should not enable persistence', (done) => {
+    afs.persistenceEnabled$.subscribe(isEnabled => {
+      expect(isEnabled).toBe(false);
+      done();
+    });
+  });
+
+});

src/firestore/firestore.ts

@@ -4,12 +4,13 @@ import { Subscriber } from 'rxjs/Subscriber';
 import { from } from 'rxjs/observable/from';
 import 'rxjs/add/operator/map';
 
-import { Injectable } from '@angular/core';
+import { Injectable, Inject, Optional } from '@angular/core';
 import { FirebaseApp } from 'angularfire2';
 
 import { QueryFn, AssociatedReference } from './interfaces';
 import { AngularFirestoreDocument } from './document/document';
 import { AngularFirestoreCollection } from './collection/collection';
+import { EnablePersistenceToken } from './enable-persistance-token';
 
 
 /**
@@ -96,7 +97,7 @@ export class AngularFirestore {
    * apps and use multiple apps.
    * @param app
    */
-  constructor(public app: FirebaseApp, shouldEnablePersistence) {
+  constructor(public app: FirebaseApp, @Optional() @Inject(EnablePersistenceToken) shouldEnablePersistence: boolean) {
     this.firestore = app.firestore();
 
     this.persistenceEnabled$ = shouldEnablePersistence ?