webpack.config.js

const MiniCssExtractPlugin = require('mini-css-extract-plugin')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const webpack = require('webpack')
const resolve = require('path').resolve
// const { BundleAnalyzerPlugin } = require('webpack-bundle-analyzer')

module.exports = {
    mode: 'development',
    entry: resolve(__dirname, 'app/index.js'),
    output: {
        path: resolve(__dirname, 'dist'),
        filename: '[name].[contenthash].js',
        publicPath: '/',
    },
    module: {
        rules: [
            {
                test: /\.(js|jsx)$/,
                use: [
                    {
                        loader: 'babel-loader',
                        query: {
                            presets: [
                                ['@babel/preset-env', {
                                    useBuiltIns: 'entry',
                                    corejs: '3',
                                    targets: '> 1%, not dead',
                                }],
                                ['@babel/preset-react'],
                            ],
                            plugins: [
                                '@babel/plugin-proposal-optional-chaining',
                            ],
                        },
                    },
                ],
            },
            {
                test: /\.(png|jpg|gif)$/,
                use: [
                    {
                        loader: 'url-loader',
                        options: {
                            limit: 8192,
                        },
                    },
                ],
            }, {
                test: /\.(css|scss)$/,
                use: [
                    MiniCssExtractPlugin.loader,
                    'css-loader',
                    'sass-loader',
                ],
            },
        ],
    },
    plugins: [
        new webpack.HashedModuleIdsPlugin(),
        new HtmlWebpackPlugin({
            template: './app/index.html',
        }),
        new MiniCssExtractPlugin({ filename: '[contenthash].css' }),
        // new BundleAnalyzerPlugin()
    ],
    optimization: {
        runtimeChunk: 'single',
        splitChunks: {
            chunks: 'all',
            maxInitialRequests: Infinity,
            minSize: 0,
            cacheGroups: {
                vendor: {
                    test: /[\\/]node_modules[\\/]/,
                    name(module) {
                        // get the name. E.g. node_modules/packageName/not/this/part.js
                        // or node_modules/packageName
                        const packageName = module.context.match(/[\\/]node_modules[\\/](.*?)([\\/]|$)/)[1]

                        // npm package names are URL-safe, but some servers don't like @ symbols
                        return `npm.${packageName.replace('@', '')}`
                    },
                },
            },
        },
    },
}