Function flushRoot

packages/react-reconciler/src/ReactFiberWorkLoop.js:1732–1744

(root: FiberRoot, lanes: Lanes)

}

export function flushRoot(root: FiberRoot, lanes: Lanes) {
  if (lanes !== NoLanes) {
    upgradePendingLanesToSync(root, lanes);
    ensureRootIsScheduled(root);
    if ((executionContext & (RenderContext | CommitContext)) === NoContext) {
      resetRenderTimer();
      // TODO: For historical reasons this flushes all sync work across all
      // roots. It shouldn't really matter either way, but we could change this
      // to only flush the given root.
      flushSyncWorkOnAllRoots();
    }
  }
}

export function getExecutionContext(): ExecutionContext {
  return executionContext;