export function onIdleCallback(callback: (idleDeadline: any) => any, options?: any): () => void {
   let token: any = null;
   if (typeof requestIdleCallback == "function") token = requestIdleCallback(callback, options);
   else token = setTimeout(callback, 1);

   return () => {
      if (typeof cancelIdleCallback == "function") cancelIdleCallback(token);
      else clearTimeout(token);
   };
}