Don't use complex ReactComponent typecheck, just typecheck func

Author: STRML

lib/Route.js

@@ -2,20 +2,15 @@
 
 var React = require('react');
 
-//! FIXME how do you typecheck a React Component (not an Element)?
-function isComponent(props, propName) {
-  if (!React.isValidElement(React.createElement(props[propName]))) {
-    throw new Error("Expected an element type or component.");
-  }
-}
-
 function createClass(name) {
   return React.createClass({
     displayName: name,
     propTypes: {
       handler: React.PropTypes.oneOfType([
+        // Can be ReactElement or ReactComponent, unfortunately there is no way to typecheck
+        // ReactComponent (that I know of)
         React.PropTypes.element,
-        isComponent
+        React.PropTypes.func
       ]),
       path: name === 'NotFound' ?
         function(props, propName) {