function extendOptions (options) {
  for (var key in options) {
    var option = config.options[key];
    config.options[key] = function (args) {
      option(args);
      options[key](args);
    };
  }
}

var config = {
  options: {
    onHide: function (args) {
      console.log(args)
    }
  }
}

extendOptions({
  onHide: function (args) {
    console.log('done')
  }
})

config.options.onHide('233')