webpack.prod.config.js

// webpack v4
const path = require('path');
const WebpackMd5Hash = require('webpack-md5-hash');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin');

module.exports = {
    entry: {main: './assets/js/index.js'},
    output: {
        path: path.resolve(__dirname + '/public/assets'),
        publicPath: '/assets/',
        filename: 'all.js',
    },
    optimization: {
        minimizer: [
            new UglifyJsPlugin({
                cache: true,
                parallel: true,
                sourceMap: true, // set to true if you want JS source maps
            }),
            new OptimizeCSSAssetsPlugin({}),
        ],
        splitChunks: {
            chunks: 'all',
        },
    },
    module: {
        rules: [
            {
                test: /\.js$/,
                exclude: /node_modules/,
                use: {
                    loader: 'babel-loader',
                },
            },
            {
                test: /\.scss$/,
                use: [
                    'style-loader',
                    MiniCssExtractPlugin.loader,
                    'css-loader',
                    'sass-loader',
                ],
            },
            {
                test: /\.(png|jp(e*)g|svg)$/,
                use: [
                    {
                        loader: 'file-loader',
                        options: {
                            name: '[name].[ext]',
                            limit: 8000,
                            outputPath: 'img/',
                        },
                    },
                ],
            },
            {
                test: /\.(woff(2)?|ttf|eot|svg)(\?v=\d+\.\d+\.\d+)?$/,
                use: [
                    {
                        loader: 'file-loader',
                        options: {
                            name: '[name].[ext]',
                            outputPath: 'font/',
                        },
                    },
                ],
            },
        ],
    },
    plugins: [
        new MiniCssExtractPlugin({
            filename: 'all.css',
            chunkFilename: '[id].css',
        }),
        new WebpackMd5Hash(),
    ],
};