webpack.prod.js

const webpack = require('webpack');
const merge = require('webpack-merge');
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const common = require('./webpack.common.js');

module.exports = merge(common, {
    mode: 'production',
    optimization: {
        runtimeChunk: 'single',
        splitChunks: {
            chunks: 'all',
            minSize: 30000,
            maxSize: 0,
            minChunks: 1,
            maxAsyncRequests: 5,
            maxInitialRequests: 3,
            automaticNameDelimiter: '~',
            name: true,
            cacheGroups: {
                vendors: {
                    test: /[\\/]node_modules[\\/]/,
                    priority: -10,
                    name(module) {
                        const packageName = module.context.match(/[\\/]node_modules[\\/](.*?)([\\/]|$)/)[1];
                        return `npm.${packageName.replace('@', '')}`;
                    }
                },
                default: {
                    minChunks: 2,
                    priority: -20,
                    reuseExistingChunk: true
                }
            }
        }
    },
    module: {
        rules: [
            {
                test: /\.css$/,
                use: [
                    { loader: MiniCssExtractPlugin.loader },
                    { loader: 'css-loader', options: { minimize: true } }
                ]
            }
        ]
    },
    plugins: [
        new webpack.DefinePlugin({ 'process.env.NODE_ENV': JSON.stringify('production') }),
        new MiniCssExtractPlugin({
            filename: "[name].[hash].css",
            chunkFilename: "[id].[hash].css"
        }),
        new webpack.HashedModuleIdsPlugin()
    ]
});