performSyncWorkOnRoot() — react Function Reference

Source Code

packages/react-reconciler/src/ReactFiberRootScheduler.js lines 608–622

function performSyncWorkOnRoot(root: FiberRoot, lanes: Lanes) {
  // This is the entry point for synchronous tasks that don't go
  // through Scheduler.
  const didFlushPassiveEffects = flushPendingEffects();
  if (didFlushPassiveEffects) {
    // If passive effects were flushed, exit to the outer work loop in the root
    // scheduler, so we can recompute the priority.
    return null;
  }
  if (enableProfilerTimer && enableProfilerNestedUpdatePhase) {
    syncNestedUpdateFlag();
  }
  const forceSync = true;
  performWorkOnRoot(root, lanes, forceSync);
}