ReactRouter：警告：React.createElement：types不能为null，未定义
警告Warning: React.createElement: type should not be null, undefined, boolean, or number. It should be a string (for DOM elements) or a ReactClass (for composite components). Warning: React.createElement: type should not be null, undefined, boolean, or number. It should be a string (for DOM elements) or a ReactClass (for composite components).
然后它抛出错误Error: Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. 当renderToString
整个代码是：
import { renderToString } from 'react-dom/server'; import * as React from "react"; import * as ReactDOM from "react-dom"; let History = require("history"); let ReactRouter = require("react-router"); let match = ReactRouter.match; let RouterContext = ReactRouter.RouterContext; let Route = ReactRouter.Route; let Router = ReactRouter.Router; let Link = ReactRouter.Link; let TestComponent = React.createClass({ render: function() { return ( <button>test</button> ); } }); console.log(renderToString(<TestComponent/>));// a let routes = [ <Route path="/" component={TestComponent}/> ]; match({ routes, location: "/" }, (error, redirectLocation, renderProps) => { if (error) { console.log(error); return; } if (redirectLocation) { console.log(redirectLocation); return; } if (renderProps) { let component = <RouterContext {...renderProps} />;// b console.log(renderToString(component));// c } });
a处的输出是正确的。
警告在b 。
错误在c 。
环境：
- react-router：1.0.3
- 历史：1.17.0
- 反应和反应：0.14.3
该代码基于https://github.com/rackt/react-router/blob/master/docs%2Fguides%2Fadvanced%2FServerRendering.md中的文档
react-router的源代码中找不到RouterContext 。
但是有RoutingContext ，所以我用它，现在就OK了。
谢谢@limelights
这似乎是一个react-router https://github.com/rackt/react-router/issues/2713的错误