field_ui_test_deprecated.module

<?php


/**
 * @file
 * Field UI test module.
 */

use Drupal\Core\Form\FormStateInterface;
use Drupal\field\FieldStorageConfigInterface;
use Drupal\field_ui\Form\FieldStorageConfigEditForm;

/**
 * Implements hook_form_FORM_ID_alter() for field_storage_config_edit_form.
 */
function field_ui_test_deprecated_form_field_storage_config_edit_form_alter(&$form, FormStateInterface $form_state) {
  if (!$form_state->getFormObject() instanceof FieldStorageConfigEditForm) {
    throw new \LogicException('field_storage_config_edit_form() expects to get access to the field storage config entity edit form.');
  }
  if (!$form_state->getFormObject()
    ->getEntity() instanceof FieldStorageConfigInterface) {
    throw new \LogicException('field_storage_config_edit_form() expects to get access to the field storage config entity.');
  }
  if (!isset($form['cardinality_container']['cardinality'])) {
    throw new \LogicException('field_storage_config_edit_form() expects to that the cardinality container with the cardinality form element exists.');
  }
  $form['cardinality_container']['hello'] = [
    '#markup' => 'Greetings from the field_storage_config_edit_form() alter.',
  ];
}