webpack.prod.config.js

const path = require('path');
const webpack = require('webpack');
const CompressionPlugin = require('compression-webpack-plugin');

module.exports = {
  entry: [
    './client/index.js',
  ],
  output: {
    path: path.join(__dirname, 'public'),
    filename: 'bundle.js',
  },
  plugins: [
    new webpack.optimize.OccurrenceOrderPlugin(),
    new webpack.DefinePlugin({
      'process.env': {
        NODE_ENV: JSON.stringify('production'),
      },
    }),
    new webpack.optimize.DedupePlugin(),
    new webpack.optimize.UglifyJsPlugin({ mangle: false, compress: { warnings: false } }),
    new webpack.optimize.AggressiveMergingPlugin(),
    new CompressionPlugin({
      asset: '[path].gz[query]',
      algorithm: 'gzip',
      test: /\.js$|\.css$|\.html$/,
      threshold: 10240,
      minRatio: 0.8,
    }),
  ],
  module: {
    loaders: [{
      test: /\.js$/,
      loader: 'babel-loader',
      exclude: /node_modules/,
      include: __dirname,
      query: {
        presets: ['es2015', 'react'],
        babelrc: false,
      },
    }],
  },
};