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当我在服务器上部署我的应用程序时出现此错误，但它在 localhost 上运行良好，请问我该如何解决？我的公共目录文件中还有用于后台通知的 firebase-messaging-sw.js文件，但错误必须在 firebase.js 文件中，因为当我删除它时，错误已消除。

这是我的Firebase.js文件代码

// Import the functions you need from the SDKs you need
import { initializeApp } from "firebase/app";
import { getMessaging ,getToken,onMessage,isSupported} from "firebase/messaging";
import { getAnalytics } from "firebase/analytics";
const firebaseConfig = {
  apiKey: "",
  authDomain: "",
  projectId: "",
  storageBucket: "",
  messagingSenderId: "",
  appId: "",
  measurementId: ""
};

// Initialize Firebase
const app=initializeApp(firebaseConfig);
getAnalytics(app);
// we need to check if messaging is supported by the browser
let messaging ;
if(isSupported()) {
  messaging = getMessaging();
}


export const requestForToken = () => {
  return getToken(messaging, { vapidKey: "" })
    .then((currentToken) =>{
      if (currentToken) {
        localStorage.setItem("RToken", currentToken);
        console.log('current token for client: ', currentToken);
        // Perform any other necessary action with the token
      } else {
        // Show permission request UI
        console.log('No registration token available. Request permission to generate one.');
      }
    })
    .catch((err) =>{
      console.log('An error occurred while retrieving token. ', err);
    });
};

export const onMessageListener = () =>
  new Promise((resolve) =>{
    onMessage(messaging, (payload) => {
      // console.log("payload", payload)
      resolve(payload);enter code here
    });
  });
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