Function remountFiber

docs/external/js/react-dom.development.js:18488–18543

(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) {