Function updateElement

lib/assets/react-source/development/react.js:17256–17279

(returnFiber, current, element, expirationTime)

	  }

	  function updateElement(returnFiber, current, element, expirationTime) {
	    if (current !== null) {
	      if (current.elementType === element.type || ( // Keep this check inline so it only runs on the false path:
	       isCompatibleFamilyForHotReloading(current, element) )) {
	        // Move based on index
	        var existing = useFiber(current, element.props);
	        existing.ref = coerceRef(returnFiber, current, element);
	        existing.return = returnFiber;

	        {
	          existing._debugSource = element._source;
	          existing._debugOwner = element._owner;
	        }

	        return existing;
	      }
	    } // Insert


	    var created = createFiberFromElement(element, returnFiber.mode, expirationTime);
	    created.ref = coerceRef(returnFiber, current, element);
	    created.return = returnFiber;
	    return created;
	  }

	  function updatePortal(returnFiber, current, portal, expirationTime) {
	    if (current === null || current.tag !== HostPortal || current.stateNode.containerInfo !== portal.containerInfo || current.stateNode.implementation !== portal.implementation) {