type RequestIdleCallbackHandle = any;
type RequestIdleCallbackOptions = {
  timeout: number;
};
type RequestIdleCallbackDeadline = {
  readonly didTimeout: boolean; timeRemaining: () => number;
};

interface Window {
  requestIdleCallback: (
      callback: (deadline: RequestIdleCallbackDeadline) => void,
      opts?: RequestIdleCallbackOptions,
      ) => RequestIdleCallbackHandle;
  cancelIdleCallback: (handle: RequestIdleCallbackHandle) => void;
}