Function flushSyncFromReconciler

packages/react-dom/src/client/ReactDOMClientFB.js:93–105

(fn: (() => R) | void)

declare function flushSyncFromReconciler<R>(fn: () => R): R;
declare function flushSyncFromReconciler(): void;
function flushSyncFromReconciler<R>(fn: (() => R) | void): R | void {
  if (__DEV__) {
    if (isAlreadyRendering()) {
      console.error(
        'flushSync was called from inside a lifecycle method. React cannot ' +
          'flush when React is already rendering. Consider moving this call to ' +
          'a scheduler task or micro task.',
      );
    }
  }
  // $FlowFixMe[incompatible-call]
  return flushSyncWithoutWarningIfAlreadyRendering(fn);
}

const flushSync: typeof flushSyncIsomorphic = disableLegacyMode
  ? flushSyncIsomorphic