/**
 * Implements hook_preprocess_HOOK().
 */
function MY_MODULE_preprocess_html(&$variables) {
  if (Drupal::routeMatch()->getRouteName() == 'my.route') {
    $variables['attributes']['class'][] = 'my-class';
  }
}

if ((Drupal::routeMatch()->getRouteName() == 'my.route') && ($this->moderationInformation->hasPendingRevision($node))) {}