Function useSyncExternalStore

packages/react-debug-tools/src/ReactDebugHooks.js:462–482

(
  subscribe: (() => void) => () => void,
  getSnapshot: () => T,
  getServerSnapshot?: () => T,
)

}

function useSyncExternalStore<T>(
  subscribe: (() => void) => () => void,
  getSnapshot: () => T,
  getServerSnapshot?: () => T,
): T {
  // useSyncExternalStore() composes multiple hooks internally.
  // Advance the current hook index the same number of times
  // so that subsequent hooks have the right memoized state.
  nextHook(); // SyncExternalStore
  nextHook(); // Effect
  const value = getSnapshot();
  hookLog.push({
    displayName: null,
    primitive: 'SyncExternalStore',
    stackError: new Error(),
    value,
    debugInfo: null,
    dispatcherHookName: 'SyncExternalStore',
  });
  return value;
}

function useTransition(): [
  boolean,