webpack.prod.js

const HtmlWebPackPlugin    = require('html-webpack-plugin')
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const CopyPlugin = require("copy-webpack-plugin");

const CssMinimizer = require('css-minimizer-webpack-plugin')
const Terser = require('terser-webpack-plugin')


module.exports ={

    mode: 'production',
    output: {
        clean: true,
        filename: 'main.[contenthash].js'
    },
    module: {
        rules: [
            {
                test: /\.html$/,
                loader: 'html-loader',
                options:{
                    sources: false
                }
            },
            {
                test: /\.css$/,
                exclude: /styles.css$/,
                use: ['style-loader', 'css-loader']

            },
            {
                test: /styles.css$/,
                use: [MiniCssExtractPlugin.loader, 'css-loader']

            },
            {
                test: /\.(png|jpe$jpe|gif)$/,
                loader: 'file-loader'
            },
            {
                test: /\.m?js$/,
                exclude: /node_modules/,
                use: {
                  loader: "babel-loader",
                  options: {
                    presets: ['@babel/preset-env']
                  }
                }
            }
        ]
    },

    optimization:{
        minimize: true,
        minimizer: [
            new CssMinimizer(),
            new Terser (),
        ]
     },
    plugins: [
        new HtmlWebPackPlugin({
            title: 'Mi webpack App',
            template: './src/index.html'
        }),

        new MiniCssExtractPlugin({
            filename: '[name].[fullhash].css',
            ignoreOrder: false
        }),
        new CopyPlugin({
            patterns: [
                {from: 'src/assets', to: 'assets/'}
            ]          
        })
    ]
}