FieldUiTestDeprecatedHooks.php

<?php

declare (strict_types=1);
namespace Drupal\field_ui_test_deprecated\Hook;

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

/**
 * Hook implementations for field_ui_test_deprecated.
 */
class FieldUiTestDeprecatedHooks {
    
    /**
     * Implements hook_form_FORM_ID_alter() for field_storage_config_edit_form.
     */
    public function formFieldStorageConfigEditFormAlter(&$form, FormStateInterface $form_state) : void {
        if (!$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.',
        ];
    }

}