webpack.config.js

var path = require('path')
var webpack = require('webpack')

module.exports = {
  entry: ['./index'],
  output: {
    path: __dirname,
    filename: 'bundle.js'
  },
  plugins: [
    new webpack.optimize.UglifyJsPlugin({
      compressor: {
        warnings: false,
      },
    }),
    new webpack.optimize.OccurenceOrderPlugin()
  ],
  module: {
    loaders: [
      { test: /\.js$/,
        loader: "babel",
        query: {
          presets: ["react", "es2015", "stage-0"]
        }
      }
    ]
  }
}