tArg && typeof lastArg === 'object' &&
        !isNodeStream(lastArg) && !isIterable(lastArg)) {
      const options = ArrayPrototypePop(streams);
      signal = options.signal;
      end = options.end;
    }

    pl(streams, (err, value) => {
      if (err) {
        reject(err);
      } else {
        resolve(value);
      }
    }, { signal, end });
  });
}

module.exports = {
  finished,
  pipeline,
};