Function updatePortalComponent

lib/assets/react-source/development/react.js:21899–21915

(current, workInProgress, renderExpirationTime)

	}

	function updatePortalComponent(current, workInProgress, renderExpirationTime) {
	  pushHostContainer(workInProgress, workInProgress.stateNode.containerInfo);
	  var nextChildren = workInProgress.pendingProps;

	  if (current === null) {
	    // Portals are special because we don't append the children during mount
	    // but at commit. Therefore we need to track insertions which the normal
	    // flow doesn't do during mount. This doesn't happen at the root because
	    // the root always starts with a "current" with a null child.
	    // TODO: Consider unifying this with how the root works.
	    workInProgress.child = reconcileChildFibers(workInProgress, null, nextChildren, renderExpirationTime);
	  } else {
	    reconcileChildren(current, workInProgress, nextChildren, renderExpirationTime);
	  }

	  return workInProgress.child;
	}

	function updateContextProvider(current, workInProgress, renderExpirationTime) {
	  var providerType = workInProgress.type;