Friendlier jQuery in CommonJS enivronments

multiple.jquery.js

(function(fn) {
  function setup($) {
    return $.fn.extend(fn(jQuery));
  }
  if (typeof exports === 'object') {
    module.exports = setup;
  } else {
    setup(jQuery || Zepto);
  }
}(function($) {
  return {
    gmap: function() {
    this.each(function(index, elem) {
      $(elem).append('<pre>GMaps</pre>');
      });
    },
    gnoop: function() {}
  }
}))

single.jquery.js

(function(fn) {
  function setup($) {
    return $.fn.gmap = fn($);
  }
  if (typeof exports === 'object') {
    module.exports = setup
  } else {
    setup(jQuery || Zepto);
  }
}(function($) {
  return function() {
   this.each(function(index, elem) {
     $(elem).append('<pre>GMaps</pre>');
    });
  }
}))

In multiple.jquery.js, shouldn't it be $.fn.extend($) instead of $.fn.extend(jQuery) ?