Hi,

Facebook is blocked in my country (and I think in some other countries) and links like `https://fb.me/react-invalid-hook-call` are blocked for me, in order to see the related documentation of the link I have to use VPN. so if is possible please use another link shortener service or point to `reactjs.org` directly.

Thanks.
/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */
import {enableIsInputPending} from '../SchedulerFeatureFlags';
export let requestHostCallback;
export let cancelHostCallback;
export let requestHostTimeout;
export let cancelHostTimeout;
export let shouldYieldToHost;
export let requestPaint;
export let getCurrentTime;
export let forceFrameRate;
const hasPerformanceNow =
  typeof performance === 'object' && typeof performance.now === 'function';
if (hasPerformanceNow) {