yepnope() test example

script.js

yepnope([{
  test: $('.CLASSNAME').length !== 0,
  yep: Drupal.settings.basePath + Drupal.settings.pintSettings.pathToTheme + '/js/vendor/YES-FILENAME.js',
  nope: Drupal.settings.basePath + Drupal.settings.pintSettings.pathToTheme + '/js/vendor/NOPE-FILENAME.js',
}]);

template.

function THEMENAME_preprocess_page(&$variables) {

  // Add custom settings
  drupal_add_js(array(
    'customThemeSettings' => array(
      'pathToTheme' => path_to_theme()
    )
  ), 'setting');
  
}