feat(afs/fcm): Allow feature use in non-server environments such as workers (#2015)

* Allow offline in all non-server environments e.g, workers
* Allow messaging in all non-server environments e.g, workers

Author: jamesdaniels

src/firestore/firestore.ts

@@ -7,7 +7,7 @@ import { AngularFirestoreDocument } from './document/document';
 import { AngularFirestoreCollection } from './collection/collection';
 
 import { FirebaseFirestore, FirebaseOptions, FirebaseAppConfig, FirebaseOptionsToken, FirebaseNameOrConfigToken, _firebaseAppFactory, FirebaseZoneScheduler } from '@angular/fire';
-import { isPlatformBrowser } from '@angular/common';
+import { isPlatformServer } from '@angular/common';
 
 import { firestore, SDK_VERSION } from 'firebase/app';
 
@@ -123,7 +123,7 @@ export class AngularFirestore {
       return firestore;
     });
 
-    if (shouldEnablePersistence && isPlatformBrowser(platformId)) {
+    if (shouldEnablePersistence && !isPlatformServer(platformId)) {
       // We need to try/catch here because not all enablePersistence() failures are caught
       // https://github.com/firebase/firebase-js-sdk/issues/608
       const enablePersistence = () => {

src/messaging/messaging.ts

@@ -1,5 +1,5 @@
 import { Injectable, Inject, Optional, NgZone, PLATFORM_ID } from '@angular/core';
-import { isPlatformBrowser } from '@angular/common';
+import { isPlatformServer } from '@angular/common';
 import { messaging } from 'firebase/app';
 import { Observable, empty, from, of, throwError } from 'rxjs';
 import { mergeMap, catchError, map, switchMap, concat, defaultIfEmpty } from 'rxjs/operators';
@@ -23,7 +23,7 @@ export class AngularFireMessaging {
     zone: NgZone
   ) {
 
-    if (isPlatformBrowser(platformId)) {
+    if (!isPlatformServer(platformId)) {
 
       // @ts-ignore
       const requireMessaging = from(import('firebase/messaging'));