code: function hasNonRootReactChild(container) {
  	  var rootEl = getReactRootElementInContainer(container);
  	  if (rootEl) {
  	    var inst = ReactDOMComponentTree.getInstanceFromNode(rootEl);
  	    return !!(inst && inst._hostParent);
  	  }
  	}
docs: True if the supplied DOM node has a direct React-rendered child that is
  not a React root element. Useful for warning in `render`,
  `unmountComponentAtNode`, etc.
  
  @param {?DOMElement} node The candidate DOM node.
  @return {boolean} True if the DOM element contains a direct child that was
  rendered by React but is not a root element.
  @internal