'item-list']; return $options; } /** * {@inheritdoc} */ public function buildOptionsForm(&$form, FormStateInterface $form_state) { parent::buildOptionsForm($form, $form_state); $form['wrapper_class'] = [ '#title' => $this->t('Wrapper class'), '#description' => $this->t('The class to provide on the wrapper, outside rows.'), '#type' => 'textfield', '#default_value' => $this->options['wrapper_class'], ]; } }