isCompositeComponent function
Returns true if element is a composite component. (created with React.createClass()).
Implementation
bool isCompositeComponent(/* [1] */ instance) {
return _isCompositeComponent(instance)
// Workaround for DOM components being detected as composite: https://github.com/facebook/react/pull/3839
&&
getProperty(instance as Object, 'tagName') == null;
}