react-router 引入hashHistory 为何为undefined

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import {Router,Link,Route,hashHistory} from 'react-router'
console.log(hashHistory) =>　undefined  ？
console.log(Route)  => 输出正确

dependencies 中已安装 "react-router": "^4.1.2",  页面运行正常，就是引入react-router 会异常这是为何？
defined
21:09:52.562 main.js:826 Warning: React.createElement: type is invalid -- expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in. Check the render method of `Root`.
21:09:52.566 main.js:826 Warning: Failed prop type: The prop `history` is marked as required in `Router`, but its value is `undefined`.
ght TypeError: Cannot read property 'location' of undefined

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