webpack.common.js

const HtmlWebpackPlugin = require('html-webpack-plugin');
const CopyWebpackPlugin = require('copy-webpack-plugin');
const ServiceWorkerWebpackPlugin = require('serviceworker-webpack-plugin');
const path = require('path');
const ImageminWebpackPlugin = require('imagemin-webpack-plugin').default;
const ImageminMozjpeg = require('imagemin-mozjpeg');
const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;

module.exports = {
    entry: path.resolve(__dirname, 'src/scripts/index.js'),
    output: {
        path: path.resolve(__dirname, 'dist'),
        filename: 'bundle.js',
    },
    optimization: {
        splitChunks: {
            chunks: 'all',
            minSize: 20000,
            maxSize: 70000,
            minChunks: 1,
            maxAsyncRequests: 30,
            maxInitialRequests: 30,
            automaticNameDelimiter: '~',
            enforceSizeThreshold: 50000,
            cacheGroups: {
                defaultVendors: {
                    test: /[\\/]node_modules[\\/]/,
                    priority: -10,
                },
                default: {
                    minChunks: 2,
                    priority: -20,
                    reuseExistingChunk: true,
                },
            },
        },
    },
    module: {
        rules: [
            {
                test: /\.css$/,
                use: [
                    {
                        loader: 'style-loader',
                    },
                    {
                        loader: 'css-loader',
                    },
                ],
            },
            {
                test: /\.(png|jpe?g|gif)$/i,
                use: [
                    {
                        loader: 'file-loader',
                    },
                ],
            },
        ],
    },
    plugins: [
        new HtmlWebpackPlugin({
            template: path.resolve(__dirname, 'src/templates/index.html'),
            filename: 'index.html',
        }),
        new CopyWebpackPlugin({
            patterns: [
                {
                    from: path.resolve(__dirname, 'src/public/'),
                    to: path.resolve(__dirname, 'dist/'),
                },
            ],
        }),
        new ServiceWorkerWebpackPlugin({
            entry: path.resolve(__dirname, 'src/scripts/sw.js'),
        }),
        new ImageminWebpackPlugin({
            plugins: [
                ImageminMozjpeg({
                    quality: 70,
                    progressive: true,
                }),
            ],
        }),
        new BundleAnalyzerPlugin({
            analyzerMode: 'static',
            openAnalyzer: false,
        },
        ),
    ],
};