Function createWorkInProgress

docs/index.js:12882–12918

(current, pendingProps)

  return !(!Component || !Component.isReactComponent);
}
function createWorkInProgress(current, pendingProps) {
  var workInProgress = current.alternate;
  null === workInProgress
    ? ((workInProgress = createFiberImplClass(
        current.tag,
        pendingProps,
        current.key,
        current.mode
      )),
      (workInProgress.elementType = current.elementType),
      (workInProgress.type = current.type),
      (workInProgress.stateNode = current.stateNode),
      (workInProgress.alternate = current),
      (current.alternate = workInProgress))
    : ((workInProgress.pendingProps = pendingProps),
      (workInProgress.type = current.type),
      (workInProgress.flags = 0),
      (workInProgress.subtreeFlags = 0),
      (workInProgress.deletions = null));
  workInProgress.flags = current.flags & 31457280;
  workInProgress.childLanes = current.childLanes;
  workInProgress.lanes = current.lanes;
  workInProgress.child = current.child;
  workInProgress.memoizedProps = current.memoizedProps;
  workInProgress.memoizedState = current.memoizedState;
  workInProgress.updateQueue = current.updateQueue;
  pendingProps = current.dependencies;
  workInProgress.dependencies =
    null === pendingProps
      ? null
      : { lanes: pendingProps.lanes, firstContext: pendingProps.firstContext };
  workInProgress.sibling = current.sibling;
  workInProgress.index = current.index;
  workInProgress.ref = current.ref;
  workInProgress.refCleanup = current.refCleanup;
  return workInProgress;
}
function resetWorkInProgress(workInProgress, renderLanes) {
  workInProgress.flags &= 31457282;
  var current = workInProgress.alternate;