Function waitFor

__tests__/mcp-daemon.test.ts:119–135

(
  predicate: () => T | undefined | null | false,
  timeoutMs: number,
  pollMs = 25,
)

}

function waitFor<T>(
  predicate: () => T | undefined | null | false,
  timeoutMs: number,
  pollMs = 25,
): Promise<T> {
  return new Promise((resolve, reject) => {
    const started = Date.now();
    const tick = () => {
      let v: T | undefined | null | false;
      try { v = predicate(); } catch (e) { return reject(e); }
      if (v) return resolve(v as T);
      if (Date.now() - started > timeoutMs) return reject(new Error(`Timed out after ${timeoutMs}ms`));
      setTimeout(tick, pollMs);
    };
    tick();
  });
}

function isAlive(pid: number): boolean {
  try { process.kill(pid, 0); return true; } catch { return false; }