getRemainingWorkInPrimaryTree() — react Function Reference

Source Code

packages/react-reconciler/src/ReactFiberBeginWork.js lines 2327–2343

function getRemainingWorkInPrimaryTree(
  current: Fiber | null,
  primaryTreeDidDefer: boolean,
  renderLanes: Lanes,
) {
  let remainingLanes =
    current !== null ? removeLanes(current.childLanes, renderLanes) : NoLanes;
  if (primaryTreeDidDefer) {
    // A useDeferredValue hook spawned a deferred task inside the primary tree.
    // Ensure that we retry this component at the deferred priority.
    // TODO: We could make this a per-subtree value instead of a global one.
    // Would need to track it on the context stack somehow, similar to what
    // we'd have to do for resumable contexts.
    remainingLanes = mergeLanes(remainingLanes, peekDeferredLane());
  }
  return remainingLanes;
}