Webpack Config

webpack.config.js

var webpack = require('webpack');

module.exports = {
  devtool: 'source-map',
  entry: {
    main: [
      './src/app.js',
      'webpack-dev-server/client?http://localhost:8080'
    ]
  },
  output: {
    path: './public/',
    publicPath: 'http://localhost:8080/',
    filename: 'app.bundle.js'
  },
  module: {
    loaders: [
      {
        test: /\.js$/,
        loader: 'babel-loader',
        query: {
          presets: ['es2015', 'react']
        },
        exclude: /node_modules/
      },
      {
        test: /\.scss$/,
        loaders: ['style', 'css', 'sass']
      }
    ]
  },
  plugins: [
    new webpack.ProvidePlugin({
      'Promise': 'es6-promise',
      'fetch': 'isomorphic-fetch'
    })
  ]
};