code: private function getCurrentThemeId()
      {
          /** @var ThemeService $themeService */
          $themeService = $this->getServiceLocator()->get(ThemeService::SERVICE_ID);
  
          return $themeService->getTheme()->getId();
      }
docs: Returns the ID of the current theme
  
  @return string
  @throws \common_exception_InconsistentData