Function raceWithTimeout

apps/kimi-code/src/cli/run-prompt.ts:49–71

* Await `promise`, but stop waiting after `timeoutMs`. * * The timeout only bounds how long we WAIT — it does not change the outcome: * - if `promise` settles first, its result is propagated (a rejection throws), * so a cleanup step that actually fails in time still surfaces; * - if the ti

(promise: Promise<void>, timeoutMs: number)

 * timer is unref'd so it never keeps the loop alive on its own.
 */
async function raceWithTimeout(promise: Promise<void>, timeoutMs: number): Promise<void> {
  let timedOut = false;
  let timer: ReturnType<typeof setTimeout> | undefined;
  // Attach the catch eagerly (synchronously) so `promise` is always consumed and
  // a late rejection can never become an unhandled rejection. Before the timeout
  // wins, the handler rethrows so a real cleanup failure still propagates.
  const guarded = promise.catch((error: unknown) => {
    if (timedOut) return;
    throw error;
  });
  const timedOutSignal = new Promise<void>((resolve) => {
    timer = setTimeout(() => {
      timedOut = true;
      resolve();
    }, timeoutMs);
    timer.unref?.();
  });
  try {
    await Promise.race([guarded, timedOutSignal]);
  } finally {
    if (timer !== undefined) clearTimeout(timer);
  }
}

interface PromptOutput {
  readonly columns?: number | undefined;