Function tap

lib/internal/streams/iter/consumers.js:337–343

* Create a pass-through transform that observes chunks without modifying them. * @param {Function} callback * @returns {Function}

(callback)

 * @returns {Function}
 */
function tap(callback) {
  validateFunction(callback, 'callback');
  return async (chunks, options) => {
    await callback(chunks, options);
    return chunks;
  };
}

/**
 * Create a sync pass-through transform that observes chunks.