Uncaught TypeError: Cannot read property 'locals' of undefined

user_6015035 0
Viewed 4835

I've made bundle.js and bundle.css to use in my web app,

My package.json looks like this:

  "dependencies": {
    "bootstrap": "^4.5.3",
    "jquery": "^3.5.1",
    "popper.js": "^1.16.1"
  },
  "devDependencies": {
    "@babel/core": "^7.12.10",
    "@babel/plugin-proposal-object-rest-spread": "^7.12.1",
    "@babel/preset-env": "^7.12.11",
    "babel-loader": "^8.2.2",
    "css-loader": "^5.0.1",
    "file-loader": "^6.2.0",
    "mini-css-extract-plugin": "^1.3.3",
    "node-sass": "^5.0.0",
    "sass-loader": "^10.1.0",
    "style-loader": "^2.0.0",
    "url-loader": "^4.1.1",
    "webpack": "^5.11.0",
    "webpack-cli": "^4.2.0"
  },

My webpack.config.js:

const path = require('path');
const webpack = require('webpack');
const MiniCssExtractPlugin = require("mini-css-extract-plugin");

module.exports = (env, argv) => {
    return {
        //Define entry point
        entry: ['./src/index.js', './src/css/index.scss'],

        //Define output point
        output: {
            path: path.resolve(__dirname, 'wwwroot/dist'),
            filename: 'bundle.js'
        },

        module: {
            rules: [
                {
                    test: /\.s[c|a]ss$/,
                    include: path.resolve(__dirname, 'src'),
                    use: [
                        'style-loader',
                        MiniCssExtractPlugin.loader,
                        'css-loader',
                        'sass-loader'
                    ]
                },
                {
                    test: /\.js$/,
                    include: path.resolve(__dirname, 'src'),
                    loader: 'babel-loader',
                    options: {
                        presets: ["@babel/preset-env"],
                        plugins: ['@babel/plugin-proposal-object-rest-spread']
                    }
                },
            ]
        },
        plugins: [
            new webpack.ProvidePlugin({
                $: 'jquery',
                jQuery: 'jquery'
            }),
            new MiniCssExtractPlugin({
                filename: 'bundle.css'
            })
        ]

    };
};

My src structure is like this:

src

index.js:

import 'jquery';
import 'bootstrap';
import './js/login';
import './js/helpers';

index.scss:

@import 'bootstrap';
@import 'util.scss';
@import 'login.scss';
@import 'site.css';

I am getting this error in console:

Console

bundle.js

Everything else is working fine, i have no problem with javascript, but it bugs me that i don't know how to fix this error.

PS: I am new to web development in general, started using webpack yesterday, the idea was to use only bundle.js and bundle.css in my html without adding jquery and bootstrap tags for them separately

asp.net-core-3.1 webpack bundle javascript .net
2 Answers

Try to set the option esModule to false for MiniCssExtractPlugin

use: [
    'style-loader',
    {
        loader: MiniCssExtractPlugin.loader,
        options: {
            esModule: false,
        },
    },
    'css-loader',
    'sass-loader'
]
user_55981720

Don't use 'style-loader' along with mini-css-extract-plugin, modify your rule to match the below:

{
    test: /\.s[c|a]ss$/,
    include: path.resolve(__dirname, 'src'),
    use: [
            //'style-loader',
            MiniCssExtractPlugin.loader,
            'css-loader',
            'sass-loader'
         ]
},

You can find more details here: https://github.com/webpack-contrib/mini-css-extract-plugin/issues/613

user_25683490
Related