webpack-prod.js

const webpack = require('webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const CleanWebpackPlugin = require('clean-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const OptimizeCssAssetsPlugin = require('optimize-css-assets-webpack-plugin');
const CompressionPlugin = require('compression-webpack-plugin');
const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;

const { srcPath, outputPath, publicPath } = require('./client');

module.exports = {
  context: srcPath,
  entry: {
    app: `${srcPath}/index.jsx`,
  },
  mode: 'production',
  output: {
    path: outputPath,
    publicPath,
    filename: '[hash].[name].js',
  },
  resolve: {
    extensions: ['.js', '.jsx', '.css'],
  },
  module: {
    rules: [
      {
        test: /\.(js?x)$/,
        include: srcPath,
        loader: 'babel-loader',
      },
      {
        test: /\.css$/,
        use: [MiniCssExtractPlugin.loader, 'css-loader'],
      },
      {
        test: /\.worker\.js$/,
        use: { loader: 'worker-loader' },
      },
    ],
  },
  plugins: [
    new CleanWebpackPlugin(outputPath, { allowExternal: true }),
    new webpack.DefinePlugin({
      'process.env': {
        NODE_ENV: JSON.stringify('production'),
      },
    }),
    new MiniCssExtractPlugin({
      filename: '[hash].[name].css',
    }),
    new OptimizeCssAssetsPlugin(),
    new HtmlWebpackPlugin({
      title: 'Preact / Unistore Test',
    }),
    new CompressionPlugin(),
    // un-comment to help with shrinking bundle size
    // new BundleAnalyzerPlugin(),
  ],
};