/**
  * Gets the full list of all registered view modes, or for a single view mode
  * if $viewMode is set to a string value.
  *
  * @param bool|string $viewMode Set to true to get full list. Or false (by default) to
  *  get only the slug of all registered view modes. Or set to a string value to
  *  get information for that view mode only.
  * @return array
  * @see \CMS\View\ViewModeRegistry::modes()
  */
 public function viewModes($viewMode = false)
 {
     return ViewModeRegistry::modes($viewMode);
 }