webpack.production.config.js

var webpack = require('webpack');
var path = require('path');
var nodeModulesPath = path.resolve(__dirname, 'node_modules');
var buildPath = path.resolve(__dirname, 'public', 'build');

var config = {

  // We change to normal source mapping
  devtool: 'source-map',
  entry: './public/index.js',
  output: {
    path: buildPath,
    filename: 'bundle.js'
  },
  plugins: [
    new webpack.optimize.UglifyJsPlugin({
      minimize: true,
      compress: {
        warnings: false
      }
    }),
    new webpack.DefinePlugin({
    'process.env.NODE_ENV': JSON.stringify(process.env.NODE_ENV || 'development')
})
  ],

  module: {
    loaders: [
      {
        test: /\.js$/,
        loader: 'babel?presets[]=react,presets[]=es2015',
        exclude: '/node_modules'
      },
      //This converts our .css into JS
      { test: /\.s?css$/, loaders: ['style', 'css', 'sass?outputStyle=expanded'] },
    ]
  },

  resolve: {
      extensions: ['', '.js', '.jsx', '.css', '.scss', '.json'],
      modulesDirectories: [
        'node_modules'
      ]
  },
};

module.exports = config;