webpack.config.prod.js

var path = require('path');
var webpack = require('webpack');

const UglifyJsPlugin = require('uglifyjs-webpack-plugin')

module.exports = {
  devtool: 'source-map',
  mode: 'production',
  entry: [
    './src/index.prod'
  ],
  output: {
    path: path.join(__dirname, 'dist'),
    filename: 'bundle.js',
    publicPath: '/static/'
  },
  optimization: {
    minimizer: [
      new UglifyJsPlugin({
        test: /\.js(\?.*)?$/i,
        cache: true,
        uglifyOptions: {
          output: {
              comments: false
          },
          minify: {},
          compress: {
              booleans: true,
          },
          toplevel: false,
          nameCache: null,
          ie8: false,
          keep_fnames: false,
        }
      }),
    ],
  },
  plugins: [
    new webpack.optimize.OccurrenceOrderPlugin(),
    new webpack.DefinePlugin({
      'process.env': {
        'NODE_ENV': JSON.stringify('production')
      }
    })
  ],
  module: {
    rules: [{
      test: /\.jsx?$/,
      use: 'babel-loader',
      include: path.join(__dirname, 'src')
    }]
  }
};