whatwg-fetch polyfill

webpak.config.js

const webpack = require('webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const path = require('path');

const config = {
  entry: {
    app: [
      'webpack/hot/dev-server',
      "./src/app.js"
    ]
  },
  stats: {
    colors: true,
    reasons: true,
  },
  debug: true,
  resolve: {
    extensions: ['', '.js', '.jsx', '.scss'],
  },
  module: {
    loaders: [
      {
        test: /\.s?css$/,
        exclude: /node_modules/,
        loaders: [
          'style',
          'css',
          'autoprefixer?browsers=last 2 version',
          'sass?' + ['outputStyle=nested'].join('&')
        ]
      },
      { test: /\.jsx?$/, loaders: ['react-hot', 'babel'], exclude: /node_modules/ },
      { test: /\.json$/, loader: 'json' },
    ]
  },
  output: {
    path: __dirname + '/build',
    publicPath: '/',
    filename: '[name].[hash].js',
    chunkFilename: '[id].[hash].js'
  },
  plugins: [
    new webpack.HotModuleReplacementPlugin(),
    new webpack.ProvidePlugin({
      // for IE11
      Promise: 'es6-promise',
      //or
      Promise: 'imports-loader?this=>global!exports-loader?global.Promise!es6-promise',

      // imports-loaders and exports-loader need to be installed
      fetch: 'imports-loader?this=>global!exports-loader?global.fetch!whatwg-fetch',
    }),
    new HtmlWebpackPlugin({
      template: path.resolve('public', 'index.html'),
      webpackDevServer: '/webpack-dev-server.js'
    })
  ]
}

module.exports = config;