Function cleanup

lib/internal/streams/iter/classic.js:507–517

(err)

  // Reject all pending waiters and remove the drain/error listeners.
  function cleanup(err) {
    const pending = waiters;
    waiters = [];
    for (let i = 0; i < pending.length; i++) {
      pending[i].reject(err ?? new AbortError());
    }
    if (!listenersInstalled) return;
    listenersInstalled = false;
    writable.removeListener('drain', onDrain);
    writable.removeListener('error', onError);
  }

  function waitForDrain() {
    const { promise, resolve, reject } = PromiseWithResolvers();