sitewide_alerts-1.0.0/src/Form/SiteAlertEntitySettingsForm.php

<?php

namespace Drupal\sitewide_alerts\Form;

use Drupal\Core\Form\FormBase;
use Drupal\Core\Form\FormStateInterface;

/**
 * Configuration form for a site alert entity type.
 */
class SiteAlertEntitySettingsForm extends FormBase {

  /**
   * {@inheritdoc}
   */
  public function getFormId() {
    return 'site_alert_settings';
  }

  /**
   * {@inheritdoc}
   */
  public function buildForm(array $form, FormStateInterface $form_state) {
    return $form;
  }

  /**
   * {@inheritdoc}
   */
  public function submitForm(array &$form, FormStateInterface $form_state) {
    $this->messenger()->addStatus($this->t('The configuration has been updated.'));
  }

}