requestIdleCallback index.js

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  /**
 * Copyright (c) Nicolas Gallagher.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @flow
 */
 
import { canUseDOM } from 'fbjs/lib/ExecutionEnvironment';
 
const _requestIdleCallback = function (cb: Function, options?: Object) {
  return setTimeout(() => {
    const start = Date.now();
    cb({
      didTimeout: false,
      timeRemaining() {
        return Math.max(0, 50 - (Date.now() - start));
      }
    });
  }, 1);
};
 
const _cancelIdleCallback = function (id) {
  clearTimeout(id);
};
 
const isSupported = canUseDOM && typeof window.requestIdleCallback !== 'undefined';
 
const requestIdleCallback: (cb: any, options?: any) => TimeoutID = isSupported
  ? window.requestIdleCallback
  : _requestIdleCallback;
const cancelIdleCallback: (TimeoutID) => void = isSupported
  ? window.cancelIdleCallback
  : _cancelIdleCallback;
 
export default requestIdleCallback;
export { cancelIdleCallback };