Function enqueueUpdate

docs/index.js:10763–10779

(fiber, update, lane)

  return { lane: lane, tag: 0, payload: null, callback: null, next: null };
}
function enqueueUpdate(fiber, update, lane) {
  var updateQueue = fiber.updateQueue;
  if (null === updateQueue) return null;
  updateQueue = updateQueue.shared;
  if (0 !== (executionContext & 2)) {
    var pending = updateQueue.pending;
    null === pending
      ? (update.next = update)
      : ((update.next = pending.next), (pending.next = update));
    updateQueue.pending = update;
    update = getRootForUpdatedFiber(fiber);
    markUpdateLaneFromFiberToRoot(fiber, null, lane);
    return update;
  }
  enqueueUpdate$1(fiber, updateQueue, update, lane);
  return getRootForUpdatedFiber(fiber);
}
function entangleTransitions(root, fiber, lane) {
  fiber = fiber.updateQueue;
  if (null !== fiber && ((fiber = fiber.shared), 0 !== (lane & 4194176))) {