export class TimeoutError extends Error {
  constructor(message: string) {
    super(message);
    this.name = "TimeoutError";
  }
}

export async function fetchWithTimeout(
  input: RequestInfo | URL,
  init: RequestInit = {},
  timeoutMs = 10_000,
): Promise<Response> {
  const controller = new AbortController();
  const timeout = setTimeout(() => controller.abort(), timeoutMs);

  try {
    return await fetch(input, {
      ...init,
      signal: init.signal ?? controller.signal,
    });
  } catch (error) {
    if (error instanceof Error && error.name === "AbortError") {
      throw new TimeoutError("请求超时");
    }
    throw error;
  } finally {
    clearTimeout(timeout);
  }
}