Function addFiberToLanesMap

packages/react-reconciler/src/ReactFiberLane.js:1153–1174

(
  root: FiberRoot,
  fiber: Fiber,
  lanes: Lanes | Lane,
)

}

export function addFiberToLanesMap(
  root: FiberRoot,
  fiber: Fiber,
  lanes: Lanes | Lane,
) {
  if (!enableUpdaterTracking) {
    return;
  }
  if (!isDevToolsPresent) {
    return;
  }
  const pendingUpdatersLaneMap = root.pendingUpdatersLaneMap;
  while (lanes > 0) {
    const index = laneToIndex(lanes);
    const lane = 1 << index;

    const updaters = pendingUpdatersLaneMap[index];
    updaters.add(fiber);

    lanes &= ~lane;
  }
}

export function movePendingFibersToMemoized(root: FiberRoot, lanes: Lanes) {
  if (!enableUpdaterTracking) {