webpack.prod.config.js

const path = require('path')
const webpack = require('webpack')
const HtmlWebPackPlugin = require('html-webpack-plugin')
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: './src/index.js',
    },
    output: {
        path: path.join(__dirname, 'dist'),
        publicPath: '/',
        filename: '[name].js',
    },
    target: 'web',
    devtool: 'source-map',
    // Webpack 4 does not have a CSS minifier, although
    // Webpack 5 wil likely come with one
    optimization: {
        minimizer: [
            new UglifyJsPlugin({
                cache: true,
                parallel: true,
                sourceMap: true // set to TRUE if you want JS source maps
            }),
            new OptimizeCSSAssetsPlugin({})
        ]
    },
    module: {
        rules: [
            {
                // Transpiles ES6-8 into ES5
                test: /\.js$/,
                exclude: /node_modules/,
                loader: 'babel-loader',
            },
            {
                // Loads the JavaScript into html template provided
                // Entry point is set below in HtmlWebPackPlugin in Plugins
                test: /\.html$/,
                use: [
                    {
                        loader: 'html-loader',
                        //options: { minimize: true }
                    }
                ]
            },
            {
                // Loads images into CSS and JavaScript files
                test: /\.(jpg|png)$/,
                use: [{ loader: 'url-loader'}]
            },
            {
                // Loads CSS into a file when you import it via JavaScript
                // Rules are set in MiniCssExtractPlugin
                test: /\.css$/,
                use: [MiniCssExtractPlugin.loader, 'css-loader']
            }
        ]
    },
    plugins: [
        new HtmlWebPackPlugin({
            template: './src/html/index.html',
            filename: './index.html',
            excludeChunks: [ 'server' ]
        }),
        new MiniCssExtractPlugin({
            filename: '[name].css',
            chunkFilename: '[id].css'
        })
    ]

}