React bundle.js错误语法？

Question

我有错误未捕获的ReferenceError：未定义ReactDOM。我查看了开发人员工具firefox。

bundle.js错误所在代码的一部分。

var React = __webpack_require__(1);
var ReactDom = __webpack_require__(158);

ReactDOM.render(React.createElement(
  'h1',
  null,
  'Boilerplate app!'
), docucument.getElementById('app'));

的package.json

{
  "name": "boilerplate",
  "version": "1.0.0",
  "description": "Simple Vova REact app",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [
    "Vlad",
    "Hacki"
  ],
  "author": "\"MIT\"",
  "license": "ISC",
  "dependencies": {
    "express": "^4.15.2",
    "react": "^0.14.7",
    "react-dom": "^0.14.7"
  },
  "devDependencies": {
    "babel-core": "^6.5.1",
    "babel-loader": "^6.2.2",
    "babel-preset-es2015": "^6.5.0",
    "babel-preset-react": "^6.5.0",
    "webpack": "^1.12.13"
  }
}