webpack.config.js

var path = require("path")
var webpack = require('webpack')
var BundleTracker = require('webpack-bundle-tracker')

module.exports = {
  context: __dirname,

  entry: './assets/js/index', // entry point of our app. assets/js/index.js should require other js modules and dependencies it needs

  output: {
      path: path.resolve('./assets/bundles/'),
      filename: "[name]-[hash].js",
  },

  plugins: [
    new BundleTracker({filename: './webpack-stats.json'}),
  ],

  module: {
    loaders: [
      { test: /\.jsx?$/, exclude: /node_modules/, loader: 'babel-loader', query: { presets:['react'] }}, // to transform JSX into JS
      { test: /\.css$/, loader: "style-loader!css-loader" },
    ],
  },

  resolve: {
    modulesDirectories: ['node_modules', 'bower_components'],
    extensions: ['', '.js', '.jsx']
  },
}