webpack.prod.js

const HtmlWebPack    = require('html-webpack-plugin');
const MiniCssExtract = require("mini-css-extract-plugin");
const Copy = 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: [MiniCssExtract.loader, 'css-loader']
            },
            {
                test: /\.(png|jpe?g|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 HtmlWebPack({
            template: "./src/index.html"
        }),
        new MiniCssExtract({
            filename: '[name].[fullhash].css',
            ignoreOrder: false,
        }),
        new Copy({
            patterns: [
                { from: 'src/assets/', to: 'assets/' }
            ],
        }),
    ],

}