webpack.config.js

const path = require('path');
const webpack = require('webpack');
let ExtractTextPlugin = require('extract-text-webpack-plugin');
let extractSASS = new ExtractTextPlugin("styles.css");

module.exports = {
  devtool: 'source-map',
  entry: [
    'whatwg-fetch',
    './src/index'
  ],
  output: {
    path: path.join(__dirname, 'public', 'dist'),
    filename: 'bundle.js',
    publicPath: '/static/'
  },
  plugins: [
    new webpack.optimize.OccurenceOrderPlugin(),
    new webpack.DefinePlugin({
      'process.env.NODE_ENV': JSON.stringify('production')
    }),
    new webpack.optimize.UglifyJsPlugin({
      compressor: {
        warnings: false
      }
    }),
    extractSASS
  ],
  module: {
    loaders: [
      {
        test: /\.js$/,
        loaders: ['babel'],
        include: path.join(__dirname, 'src')
      },
      {
        test: /\.scss$/,
        loader: (process.env.NODE_ENV === 'production') ? extractSASS.extract(['css','sass']) : 'style!css!sass'
      }
    ]
  }
};