webpack.base.config.js

const path = require('path');
const BundleTracker = require('webpack-bundle-tracker');

module.exports = {
  context: __dirname,

  entry: ['./assets/js/index'],

  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', // to transform JSX into JS
        query: {
          presets: ['react', 'env'],
        },
      },
    ],
  },

  resolve: {
    modules: ['node_modules', 'bower_components'],
    extensions: ['*', '.js', '.jsx'],
  },
};