A guide to resolving the error "Unable to find 'require' in vuejs"

I am currently working on a project using vuejs and firebase. I encountered an issue while trying to import firestore. When I accessed my page, I saw this error message in the console: ReferenceError: require is not defined

I attempted to place the import section within the mounted() method, but I received an error stating that the import should be placed at the top, so that's where I placed it.

Below is the HTML content of my register.html file:

<script src="https://www.gstatic.com/firebasejs/6.4.0/firebase-app.js"></script>
<script src="https://www.gstatic.com/firebasejs/6.4.0/firebase-auth.js"></script>
<script src="https://www.gstatic.com/firebasejs/6.4.0/firebase-firestore.js"></script>

<script>
  var firebaseConfig = {
    apiKey: "AIzaSyCNYH-sKZZXZhZt5LxQSDqwet7OTo5KgHM",
    authDomain: "thelogoagency-3a11d.firebaseapp.com",
    databaseURL: "https://thelogoagency-3a11d.firebaseio.com",
    projectId: "thelogoagency-3a11d",
    messagingSenderId: "101296201242",
    appId: "1:101296201242:web:00d0e7e3554b518d"
  };
  firebase.initializeApp(firebaseConfig);
</script>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<script src="register.js"></script>

The beginning of my register.js file:

// Required for side-effects
require("firebase/firestore");

var app = new Vue({
    el: "#root",
    data: {
        burgerClass: "navbar-burger",
        menuClass: "navbar-menu",
        mobileMenuIsActive: "",
        mobileMenuHasBeenClicked: false,
        firstNameInput: "",
        lastNameInput: "",
        emailInput: "",
        passwordInput: "",
        authError : "",
        emailErrorClass : "",
        emailErrorHelp : "",
        passwordErrorClass : "",
        passwordErrorHelp : "",
        inputClass: "input ",
        nameErrorHelp: "",
        isLoading: false,
        firebase: firebase,
        db: null,
        numberOfInit: 0
    },

And the mounted() function:

if(this.numberOfInit == 0) {
    firebase.initializeApp({
        apiKey: 'AIzaSyCNYH-sKZZXZhZt5LxQSDqwet7OTo5KgHM',
        authDomain: 'thelogoagency.tk',
        projectId: '1:101296201242:web:00d0e7e3554b518d'
    });

    this.db = firebase.firestore();
    this.numberOfInit++;
    this.db.collection("users").add({
        first: "Ada",
        last: "Lovelace",
        born: 1815
    })
    .then(function(docRef) {
        console.log("Document written with ID: ", docRef.id);
    })
    .catch(function(error) {
        console.error("Error adding document: ", error);
    });
}

Even though I followed the documentation from Firebase, it still doesn't seem to work as expected. I appreciate any help or guidance. Thank you!

Answer №1

When utilizing JavaScript without NodeJS, it is important to connect your library by including the following script:

<script src="https://my/lib.js"></script>

This will allow you to eliminate the need for the require line in your code. It's that simple!

Answer №2

Incorporating the require notation is essential for npm users who are compiling JS code. However, if you opt to utilize the CDN script tag exclusively, you can safely omit the require line from your code.

Answer №3

To get started, make sure to install both firebase-admin and firebase through npm. Once that's done, instead of using require("firebase/firestore"), try using require('firebase-admin'). Keep in mind, running Backend Services on the Client Side is not possible.

Answer №4

The solution I found was simply removing these two lines from the code!

        const firebase = require("firebase");
        require("firebase/firestore");

These lines are unnecessary if you are using JavaScript without NodeJS.

All you need are these CDNs:

    <script src="https://www.gstatic.com/firebasejs/8.0.1/firebase-app.js"></script>
    <script src="https://www.gstatic.com/firebasejs/8.0.1/firebase-auth.js"></script>
    <script src="https://www.gstatic.com/firebasejs/8.0.1/firebase-firestore.js"></script>

To initialize Firestore, use the following code:

    firebase.initializeApp(firebaseConfig);
    var db = firebase.firestore();

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