webpack.config.js

var webpack = require('webpack');

module.exports = {
  entry: ['./src/index.js'],
  output: {
    path: __dirname,
    publicPath: '/',
    filename: 'bundle.js'
  },
  module: {
    loaders: [
      {
        exclude: /node_modules/,
        loader: 'babel',
        query: {
          presets: ['react', 'es2015', 'stage-1']
        }
      },
      { test: /\.css$/, loader: "style-loader!css-loader" },
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        loaders: [
            'file?hash=sha512&digest=hex&name=[hash].[ext]',
            'image-webpack?bypassOnDebug'
        ]
      }
    ]
  },
  resolve: {
    extensions: ['', '.js', '.jsx']
  },
  devServer: {
    historyApiFallback: true,
    contentBase: './',
    watchOptions: {
      aggregateTimeout: 300,
      poll: 1000
    }
  },
  plugins: [
    new webpack.DefinePlugin({
      'process.env.NODE_ENV': JSON.stringify(process.env.NODE_ENV)
    }),
  ]
};