webpack.config.prod.js

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

module.exports = {
  devtool: 'source-map',
  entry: [
    './src/index'
  ],
  output: {
    path: path.join(__dirname, 'dist'),
    filename: 'bundle.js',
    publicPath: '/static/'
  },
  plugins: [
    /**
     * This plugin assigns the module and chunk ids by occurence count. What this
     * means is that frequently used IDs will get lower/shorter IDs - so they become
     * more predictable.
     */
    new webpack.optimize.OccurenceOrderPlugin(),
    /**
     * See description in 'webpack.config.dev' for more info.
     */
    new webpack.DefinePlugin({
      'process.env.NODE_ENV': JSON.stringify('production')
    }),
    /**
     * Some of you might recognize this! It minimizes all your JS output of chunks.
     * Loaders are switched into a minmizing mode. Obviously, you'd only want to run
     * your production code through this!
     */
    new webpack.optimize.UglifyJsPlugin({
      compressor: {
        warnings: false
      }
    })
  ],
  module: {
    loaders: [
      {
        test: /\.js$/,
        loaders: ['babel'],
        include: path.join(__dirname, 'src')
      },
      {
        test: /\.scss$/,
        loader: 'style!css!sass'
      }
    ]
  }
};