chore(): Use PersistenceSettings from interfaces, also fix types in f…

…irestore.ts

src/firestore/firestore.module.ts

@@ -1,8 +1,8 @@
 import { ModuleWithProviders, NgModule } from '@angular/core';
+import { PersistenceSettings } from './interfaces';
 import { AngularFirestore, EnablePersistenceToken, PersistenceSettingsToken } from './firestore';
 
 import 'firebase/firestore';
-import { firestore } from 'firebase/app';
 
 @NgModule({
  providers: [ AngularFirestore ]
@@ -11,7 +11,7 @@ export class AngularFirestoreModule {
  /**
  * Attempt to enable persistent storage, if possible
  */
- static enablePersistence(persistenceSettings?: firestore.PersistenceSettings): ModuleWithProviders {
+ static enablePersistence(persistenceSettings?: PersistenceSettings): ModuleWithProviders {
  return {
  ngModule: AngularFirestoreModule,
  providers: [

src/firestore/firestore.ts

@@ -9,6 +9,8 @@ import { AngularFirestoreCollection } from './collection/collection';
 import { FirebaseFirestore, FirebaseOptions, FirebaseAppConfig, FirebaseOptionsToken, FirebaseNameOrConfigToken, _firebaseAppFactory, FirebaseZoneScheduler } from '@angular/fire';
 import { isPlatformBrowser } from '@angular/common';
 
+import { firestore } from 'firebase/app';
+
 /**
  * The value of this token determines whether or not the firestore will have persistance enabled
  */