ant-design/components/_util/throttleByAnimationFrame.tsx

import raf from 'raf';

export function throttleByAnimationFrame(fn: (...args: any[]) => void) {
  let requestId: number | null;

  const later = (args: any[]) => () => {
    requestId = null;
    fn(...args);
  };

  const throttled = (...args: any[]) => {
    if (requestId == null) {
      requestId = raf(later(args));
    }
  };

  (throttled as any).cancel = () => raf.cancel(requestId!);

  return throttled;
}

export function throttleByAnimationFrameDecorator() {
  return function throttle(target: any, key: string, descriptor: any) {
    const fn = descriptor.value;
    let definingProperty = false;
    return {
      configurable: true,
      get() {
        // In IE11 calling Object.defineProperty has a side-effect of evaluating the
        // getter for the property which is being replaced. This causes infinite
        // recursion and an "Out of stack space" error.
        // eslint-disable-next-line no-prototype-builtins
        if (definingProperty || this === target.prototype || this.hasOwnProperty(key)) {
          /* istanbul ignore next */
          return fn;
        }

        const boundFn = throttleByAnimationFrame(fn.bind(this));
        definingProperty = true;
        Object.defineProperty(this, key, {
          value: boundFn,
          configurable: true,
          writable: true,
        });
        definingProperty = false;
        return boundFn;
      },
    };
  };
}