Error in Next.js: The function (0 , firebase_auth__WEBPACK_IMPORTED_MODULE_1__.onAuthStateChanged) is not defined as a function

Question

Error in Next.js: The function (0 , firebase_auth__WEBPACK_IMPORTED_MODULE_1__.onAuthStateChanged) is not defined as a function

Just starting out with Next.js development and currently following a Youtube tutorial on creating a Whatsapp clone using firebase8.9 as the database.

I am looking to implement a feature where the app checks if the user is logged in, if so redirect them to the home page, otherwise direct them to the login page.

import '../styles/globals.css'
import { useAuthState } from "react-firebase-hooks/auth"
import { auth, db } from "../firebase"
import Login from "./login"

function MyApp({ Component, pageProps }) {

  const [user] = useAuthState(auth);

  

  return <Component {...pageProps} />;
}

export default MyApp

This is how my firebase.js file looks:

import firebase from 'firebase';


const firebaseConfig = {
    apiKey: "apikey",
    authDomain: "authdomain",
    projectId: "projectid",
    storageBucket: "storagebucket",
    messagingSenderId: "messagingsenderid",
    appId: "appid"
  };


const app = !firebase.apps.length ? firebase.initializeApp(firebaseConfig) : firebase.app();

const db = app.firestore();

const auth = app.auth();

const provider = new firebase.auth.GoogleAuthProvider();

export { db, auth, provider };

If anyone can assist me in resolving this issue, I would greatly appreciate it. Thank you in advance!

javascript firebase next.js typeerror

Answer 1

Answer №1

Currently, the firebase version has been updated to 9+ and changes have been made to the firebase hooks, altering the entire structure. To resolve this issue, you can simply navigate to your package.json file and update the "firebase" version to

"firebase": "8.0.0"

.

Next, locate the entry for "react-firebase-hooks" in the same package.json file and update its version to

"react-firebase-hooks": "^3.0.4"

from the current version.

After making these changes, proceed to your terminal and execute the command yarn install. This will effectively resolve the version discrepancies.

Answer 2

Currently, the firebase version has been updated to 9+ and changes have been made to the firebase hooks, altering the entire structure. To resolve this issue, you can simply navigate to your package.json file and update the "firebase" version to

"firebase": "8.0.0"

.

Next, locate the entry for "react-firebase-hooks" in the same package.json file and update its version to

"react-firebase-hooks": "^3.0.4"

from the current version.

After making these changes, proceed to your terminal and execute the command yarn install. This will effectively resolve the version discrepancies.

Answer 3

Answer №2

"database": "firebase",
"version": "8.2.1",

The setup described above was successful in resolving the issue at hand, despite encountering a discrepancy with my react-firebase-hooks version being ^5.0.0

Answer 4

"database": "firebase",
"version": "8.2.1",

The setup described above was successful in resolving the issue at hand, despite encountering a discrepancy with my react-firebase-hooks version being ^5.0.0

Answer 5

Answer №3

To check if the user has been authenticated, you can verify whether the "user" is not null. If the "user" is not null, then the user has been authenticated. However, if the "user" is null, then the user has not been authenticated.

Approach 1

import '../styles/globals.css'
import { useAuthState } from "react-firebase-hooks/auth"
import { auth, db } from "../firebase"
import Login from "./login"

function MyApp({ Component, pageProps }) {

  const [user] = useAuthState(auth);

  if (user) {
    return <Component {...pageProps} />;
  } else {
    return <Login />;
  }
}

export default MyApp

Approach 2

If there are any errors, they will provide information on the location of the issue.

import '../styles/globals.css'
import { useAuthState } from "react-firebase-hooks/auth"
import { auth, db } from "../firebase"
import Login from "./login"

function MyApp({ Component, pageProps }) {

  const [user, loading, error] = useAuthState(auth);

  if (loading) {
    return <div>Loading...</div>;
  }

  if (error) {
    return <div>Error: {error}</div>;
  }

  if (!user) {
    return <Login />;
  }

  return <Component {...pageProps} />;
}

export default MyApp

Approach 3

If the previous methods did not work, attempt wrapping your "auth check" code within an "onAuthStateChange" function as shown below:

import '../styles/globals.css'
import { useEffect } from 'react';
import { useAuthState } from "react-firebase-hooks/auth"
import { auth, db } from "../firebase"
import Login from "./login"

function MyApp({ Component, pageProps }) {
  const [user, setUser] = useState(null);
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    auth.onAuthStateChanged(function(currentUser) {
      if (currentUser) {
        setUser(currentUser)
      }
      setLoading(false);
    });
  }, []);

  if (loading) {
    return <div>Loading...</div>;
  }

  if (user) {
    return <Component {...pageProps} />;
  } else {
    return <Login />;
  }
}

export default MyApp

The variable "currentUser" represents the authenticated user.

Answer 6

To check if the user has been authenticated, you can verify whether the "user" is not null. If the "user" is not null, then the user has been authenticated. However, if the "user" is null, then the user has not been authenticated.

Approach 1

import '../styles/globals.css'
import { useAuthState } from "react-firebase-hooks/auth"
import { auth, db } from "../firebase"
import Login from "./login"

function MyApp({ Component, pageProps }) {

  const [user] = useAuthState(auth);

  if (user) {
    return <Component {...pageProps} />;
  } else {
    return <Login />;
  }
}

export default MyApp

Approach 2

If there are any errors, they will provide information on the location of the issue.

import '../styles/globals.css'
import { useAuthState } from "react-firebase-hooks/auth"
import { auth, db } from "../firebase"
import Login from "./login"

function MyApp({ Component, pageProps }) {

  const [user, loading, error] = useAuthState(auth);

  if (loading) {
    return <div>Loading...</div>;
  }

  if (error) {
    return <div>Error: {error}</div>;
  }

  if (!user) {
    return <Login />;
  }

  return <Component {...pageProps} />;
}

export default MyApp

Approach 3

If the previous methods did not work, attempt wrapping your "auth check" code within an "onAuthStateChange" function as shown below:

import '../styles/globals.css'
import { useEffect } from 'react';
import { useAuthState } from "react-firebase-hooks/auth"
import { auth, db } from "../firebase"
import Login from "./login"

function MyApp({ Component, pageProps }) {
  const [user, setUser] = useState(null);
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    auth.onAuthStateChanged(function(currentUser) {
      if (currentUser) {
        setUser(currentUser)
      }
      setLoading(false);
    });
  }, []);

  if (loading) {
    return <div>Loading...</div>;
  }

  if (user) {
    return <Component {...pageProps} />;
  } else {
    return <Login />;
  }
}

export default MyApp

The variable "currentUser" represents the authenticated user.

Answer 7

Answer №4

Having trouble with a similar issue

I found the solution by navigating to the node_modules directory and updating react-firebase-hook from version 4.0.0 to 3.0.4.

Simply running yarn install resolved the problem for me...

Answer 8

Having trouble with a similar issue

I found the solution by navigating to the node_modules directory and updating react-firebase-hook from version 4.0.0 to 3.0.4.

Simply running yarn install resolved the problem for me...

Error in Next.js: The function (0 , firebase_auth__WEBPACK_IMPORTED_MODULE_1__.onAuthStateChanged) is not defined as a function

Answer №1

Answer №2

Answer №3

Answer №4

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