webpack.config.js

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

module.exports = {
    devtool: 'eval',
    entry: [
        'webpack-dev-server/client?http://localhost:3000',
        'webpack/hot/only-dev-server',
        './src/index'
    ],
    output: {
        path: path.join(__dirname, 'dist'),
        filename: 'bundle.js',
        publicPath: '/static/'
    },
    plugins: [
        new webpack.HotModuleReplacementPlugin()
    ],
    module: {
        loaders: [{
            test: /\.js$/,
            loaders: ['react-hot', 'babel'],
            include: path.join(__dirname, 'src')
        },
        {
            test: /\.css$/,
            loader: "style-loader!css-loader"
        },
        {
            test: /\.jsx?$/,
            exclude: /(node_modules|bower_components)/,
            loader: 'babel', // 'babel-loader' is also a legal name to reference
            query: {
                presets: ['react', 'es2015']
            }
        }]
    }
};