webpack.prod.js

const path = require('path');
const webpack = require('webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin');

module.exports = {
  entry: __dirname + '/src/index.js',
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        exclude: /(node_modules|bower_components)/,
        loader: 'babel-loader',
      },
      {
        test: /\.css$/,
        use: [
          'style-loader',
          {
            loader: 'css-loader',
            options: {
              modules: true,
              sourceMap: true,
              localIdentName: '[name]__[local]--[hash:base64:5]',
            },
          },
        ],
      },
    ],
  },
  resolve: { extensions: ['*', '.js', '.jsx'] },
  mode: 'production',
  optimization: {
    usedExports: true,
  },
  devtool: 'source-map',
  output: {
    filename: 'bundle.js',
    path: path.resolve(__dirname, 'public'),
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: __dirname + '/src/index.html',
      title: 'React Test Production',
    }),
    new webpack.DefinePlugin({
      'process.env.NODE_ENV': JSON.stringify('production'),
    }),
  ],
};