export function joinTimestamp<T extends boolean>(join: boolean, restful: T): T extends true ? string : object;

export function joinTimestamp(join: boolean, restful = false): string | object {
  if (!join) {
    return restful ? '' : {};
  }
  const now = new Date().getTime();
  if (restful) {
    return `?_t=${now}`;
  }
  return { _t: now };
}