使用webpack反应项目。引用错误：未定义React

Question

我浏览过其他帖子，但没有设法找到答案。 这是我的设置：

在package.json中：

{
  "name": "myr",
  "version": "0.0.0",
  "private": true,
  "scripts": {
    "dev": "webpack -d --watch",
    "build": "webpack -p",
    "start": "webpack -d ; node ./bin/www"
  },
  "dependencies": {
    "babel-loader": "^7.0.0",
    "babel-preset-es2015": "^6.24.1",
    "babel-preset-react": "^6.24.1",
    "body-parser": "~1.17.1",
    "cookie-parser": "~1.4.3",
    "debug": "~2.6.3",
    "express": "~4.15.2",
    "jade": "~1.11.0",
    "morgan": "~1.8.1",
    "react": "^15.6.1",
    "react-dom": "^15.6.1",
    "serve-favicon": "~2.4.2"
  },
  "devDependencies": {
    "babel-core": "^6.25.0",
    "webpack": "^2.6.1"
  }
}

在webpack.config.js中：

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

var BUILD_DIR = path.resolve(__dirname, '');
var APP_DIR = path.resolve(__dirname, 'app');

var config = {
  entry: APP_DIR + '/index.jsx',
  output: {
    path: BUILD_DIR,
    filename: 'bundle.js'
  },
  module : {
    loaders : [
      {
        test : /\.jsx?/,
        include : APP_DIR,
        loader : 'babel-loader',
        query: {
          presets: ['es2015', 'react']
        }
      }
    ]
  }
};

module.exports = config;

在index.jsx中：

import React, {Component} from 'react';
import ReactDOM from 'react-dom';
import AwesomeComponent from './AwesomeComponent.jsx';

class App extends Component {
  render () {
    return (
      <div>
        <p> Hello React!</p>
        <AwesomeComponent />
      </div>
    );
  }
}

ReactDOM.render(<App/>, document.getElementByID('app'));

浏览器的控制台输出显示：

我试图调查bundle.js，但没有多大帮助。 我浏览了其他帖子，无法找到答案。

React存在于node_modules和package.json

中