Function waitFor

src/tasks/background-scheduled-task/daemon.test.ts:341–348

(get: () => T, timeout = 3000, interval = 25)

// Polls `get` until it returns a truthy value or the timeout elapses, instead
// of sleeping a fixed amount and hoping the (real-timer) fire already happened.
async function waitFor<T>(get: () => T, timeout = 3000, interval = 25): Promise<T> {
  const deadline = Date.now() + timeout;
  for (;;) {
    const value = get();
    if (value || Date.now() > deadline) return value;
    await new Promise(r => setTimeout(r, interval));
  }
}