Function remountFiber

lib/assets/react-source/development/react.js:22048–22103

(current, oldWorkInProgress, newWorkInProgress)

	}

	function remountFiber(current, oldWorkInProgress, newWorkInProgress) {
	  {
	    var returnFiber = oldWorkInProgress.return;

	    if (returnFiber === null) {
	      throw new Error('Cannot swap the root fiber.');
	    } // Disconnect from the old current.
	    // It will get deleted.


	    current.alternate = null;
	    oldWorkInProgress.alternate = null; // Connect to the new tree.

	    newWorkInProgress.index = oldWorkInProgress.index;
	    newWorkInProgress.sibling = oldWorkInProgress.sibling;
	    newWorkInProgress.return = oldWorkInProgress.return;
	    newWorkInProgress.ref = oldWorkInProgress.ref; // Replace the child/sibling pointers above it.

	    if (oldWorkInProgress === returnFiber.child) {
	      returnFiber.child = newWorkInProgress;
	    } else {
	      var prevSibling = returnFiber.child;

	      if (prevSibling === null) {
	        throw new Error('Expected parent to have a child.');
	      }

	      while (prevSibling.sibling !== oldWorkInProgress) {
	        prevSibling = prevSibling.sibling;

	        if (prevSibling === null) {
	          throw new Error('Expected to find the previous sibling.');
	        }
	      }

	      prevSibling.sibling = newWorkInProgress;
	    } // Delete the old fiber and place the new one.
	    // Since the old fiber is disconnected, we have to schedule it manually.


	    var last = returnFiber.lastEffect;

	    if (last !== null) {
	      last.nextEffect = current;
	      returnFiber.lastEffect = current;
	    } else {
	      returnFiber.firstEffect = returnFiber.lastEffect = current;
	    }

	    current.nextEffect = null;
	    current.effectTag = Deletion;
	    newWorkInProgress.effectTag |= Placement; // Restart work from the new fiber.

	    return newWorkInProgress;
	  }
	}

	function beginWork(current, workInProgress, renderExpirationTime) {