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В моем проекте firebase не может получить разрешение на уведомление и возвращает ошибку. Ошибка возникает в методе requesttoken (). Я использую Firebase 7.6.0 в angular 8.

 `Uncaught TypeError: Cannot read properties of undefined (reading 'filter')  at _firebaseAppFactory (firebase.app.module.js:27)  at MapSubscriber.project (messaging.js:22)  at MapSubscriber._next (map.js:29)  at MapSubscriber.next (Subscriber.js:49)  at Notification.observe (Notification.js:20)  at QueueAction.dispatch (observeOn.js:25)  at angularfire2.js:20  at ZoneDelegate.invoke (zone-evergreen.js:359)  at Zone.runGuarded (zone-evergreen.js:134)  at QueueAction.workInZone (angularfire2.js:19)`  

Это мои файлы. Работник сферы услуг

 import firebase from "firebase/compat/app"; const app=firebase.initializeApp({  ... }); const messaging = firebase.messaging();  

Служба обмена сообщениями.

 import { Injectable } from '@angular/core'; import { AngularFireMessaging } from '@angular/fire/messaging'; import { BehaviorSubject } from 'rxjs' @Injectable() export class MessagingService {  currentMessage = new BehaviorSubject(null);  constructor(private angularFireMessaging: AngularFireMessaging) {  this.angularFireMessaging.messaging.subscribe(  (_messaging) =gt; {  _messaging.onMessage = _messaging.onMessage.bind(_messaging);  _messaging.onTokenRefresh = _messaging.onTokenRefresh.bind(_messaging);  }  )  }  requestPermission() {  this.angularFireMessaging.requestToken.subscribe(  (token) =gt; {  console.log(token);  },  (err) =gt; {  console.error('Unable to get permission to notify.', err);  }  );  }  receiveMessage() {  this.angularFireMessaging.messages.subscribe(  (payload) =gt; {  console.log("new message received. ", payload);  this.currentMessage.next(payload);  })  } }