webpack.config.js

/* global __dirname, module, require */
const path = require('path');
const webpack = require('webpack');
const BundleTracker = require('webpack-bundle-tracker');

module.exports = {
    context: __dirname,
    entry: ['babel-polyfill', './assets/js/index'],

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

    plugins: [
        // Store data about bundles in './webpack-stats.json'.
        new BundleTracker({filename: './webpack-stats.json'}),
        // Make jQuery available in every module.
        new webpack.ProvidePlugin({
            $: 'jquery',
            jQuery: 'jquery',
            'window.jQuery': 'jquery',
        }),
    ],

    module: {
        rules: [
            {
                test: /\.jsx?$/,
                exclude: /node_modules/,
                use: {
                    loader: 'babel-loader',
                    options: {
                        presets: ['react', 'env'],
                    },
                },
            },
        ],
    },

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