Failed to compile. & Duplicate declaration "React"

Environment(required) | 环境（必填）

roadhog version（roadhog版本） ^2.4.5
Nodejs and Npm version（Nodejs 和 Npm 版本） node v8.12.0 npm 6.4.1
Operating environment (e.g. OS name) and its version（操作系统版本）: windows10
What did you do? Please provide steps to re-produce your problem.（请提供复现步骤）

在components/目录下有一个ProductList的组件，
```
import React from 'react';
import PropTypes from 'prop-types';
import { Button } from 'antd';
```

const ProductList = (props) => { return

};

export default ProductList;

ProductList.propTypes = { name: PropTypes.string };

在roadhog server下能正常运行没有报错，但是运行build命令时，提示报错

![2018-10-08_154122.png](https://i.loli.net/2018/10/08/5bbb0a434f700.png)

用浏览器打开dist文件中的index.html文件，在console面板得到如下信息

![2018-10-08_154022.png](https://i.loli.net/2018/10/08/5bbb09fe5406c.png)

查询starkoverflow后发现好像跟 'prop-types' 有关，
移除 ` import PropTypes from 'prop-types'; `
移除 `
ProductList.propTypes = {
  name: PropTypes.string
};
`
后编译顺利通过，无报错

附上package.json 代码

{ "private": true, "scripts": { "start": "roadhog server", "build": "roadhog build", "lint": "eslint --ext .js src test", "precommit": "npm run lint" }, "dependencies": { "antd": "^3.10.0", "babel-plugin-import": "^1.9.1", "dva": "^2.4.0", "prop-types": "^15.6.2", "react": "^16.2.0", "react-dom": "^16.2.0" }, "devDependencies": { "babel-plugin-dva-hmr": "^0.4.1", "eslint": "^4.14.0", "eslint-config-umi": "^0.1.1", "eslint-plugin-flowtype": "^2.34.1", "eslint-plugin-import": "^2.6.0", "eslint-plugin-jsx-a11y": "^5.1.1", "eslint-plugin-react": "^7.1.0", "husky": "^0.12.0", "redbox-react": "^1.4.3", "roadhog": "^2.4.5" } }



#### What do you expected?（预期的正常效果）

build顺利进行，没有报错信息

#### What happen?（发生了何种非正常现象）
提示 Failed to compile.  & Duplicate declaration "React"

#### Re-producible online demo (可复现的在线demo)

sorrycc / roadhog

Failed to compile. & Duplicate declaration "React" #818

Environment(required) | 环境（必填）

What did you do? Please provide steps to re-produce your problem.（请提供复现步骤）