Function waitFor

__tests__/watcher.test.ts:41–55

* Helper to wait for a condition with timeout. Used for assertions that depend * on the debounce timer (real setTimeout) firing, or on the real watcher's * event delivery in the end-to-end test.

(
  condition: () => boolean,
  timeoutMs = 2000,
  intervalMs = 25
)

 * event delivery in the end-to-end test.
 */
function waitFor(
  condition: () => boolean,
  timeoutMs = 2000,
  intervalMs = 25
): Promise<void> {
  return new Promise((resolve, reject) => {
    const start = Date.now();
    const check = () => {
      if (condition()) return resolve();
      if (Date.now() - start > timeoutMs) return reject(new Error('waitFor timed out'));
      setTimeout(check, intervalMs);
    };
    check();
  });
}

describe('FileWatcher', () => {
  let testDir: string;