test.jsx

import React from 'react';
import ReactDOM from 'react-dom'
import Todo from 'Todo';

export const TodoList = ({todos, onTodoClick}) => (
    <ul>
        {todos.map(todo => <Todo key={todo.id} {...todo} onClick={() => onTodoClick(todo.id)} />)}
    </ul>
);

webpack.config.js

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

module.exports = {
  entry: [
    'webpack-dev-server/client?http://localhost:3000',
    'webpack/hot/only-dev-server',
    './src/app/index.jsx'
  ],
  output: {
    path: path.join(__dirname, 'dist'),
    filename: 'bundle.js',
    publicPath: '/static/'
  },
  plugins: [
    new webpack.HotModuleReplacementPlugin()
  ],
  module: {
    loaders: [{
      test: /\.jsx$/,
      loaders: ['react-hot', 'babel'],
      include: path.join(__dirname, 'src/app')
    }]
  }
};