webpack.config.prod.js

const webpack = require('webpack');
const ExtractTextPlugin = require('extract-text-webpack-plugin');

module.exports = {
  devtool: 'source-map',

  entry: `${__dirname}/client/index.js`,

  output: {
    path: `${__dirname}/static/dist/`,
    filename: 'bundle.js',
  },

  resolve: {
    extensions: ['', '.js', '.jsx'],
  },

  module: {
    loaders: [{
      test: /\.css$/,
      loader: ExtractTextPlugin.extract('style', 'css?modules'),
    }, {
      test: /\.jsx*$/,
      exclude: 'node_modules',
      loader: 'babel',
      query: {
        babelrc: false,
        presets: ['react', 'es2015-webpack', 'stage-0', 'async-to-bluebird'],
        cacheDirectory: true,
      },
    }],
  },

  plugins: [
    new webpack.optimize.OccurrenceOrderPlugin(),
    new webpack.DefinePlugin({
      'process.env': {
        'NODE_ENV': JSON.stringify('production'),
      },
    }),
    new webpack.optimize.UglifyJsPlugin({
      compressor: {
        warnings: false,
      },
    }),
    new ExtractTextPlugin('app.css'),
  ],
};