views_ui_ajax_update_form

views_ui_ajax_update_form($form, FormStateInterface $form_state)

function views_ui_ajax_update_form($form, FormStateInterface $form_state) {
  // The region that needs to be updated was stored in a property of the
  // triggering element by views_ui_add_ajax_trigger(), so all we have to do is
  // retrieve that here.
  return NestedArray::getValue($form, $form_state->getTriggeringElement()['#views_ui_ajax_data']['refresh_parents']);
}