Rendezvény-beléptető mobilapp

/** No response at all = network failure (offline, timeout). A 4xx/5xx reply is not. */
function isNetworkError(error: unknown): boolean {
  return axios.isAxiosError(error) && !error.response;
}

/**
 * Retries a call once on a network failure. ONLY use it for calls that are
 * safe to repeat: reads, or writes that are idempotent on the server.
 */
async function withNetworkRetry<T>(call: () => Promise<T>, retries = 1): Promise<T> {
  try {
    return await call();
  } catch (error) {
    if (retries > 0 && isNetworkError(error)) {
      await new Promise((resolve) => setTimeout(resolve, 700));
      return withNetworkRetry(call, retries - 1);
    }
    throw error;
  }
}