TestItemWithPreconfiguredOptions.php

<?php

declare (strict_types=1);
namespace Drupal\field_test\Plugin\Field\FieldType;

use Drupal\Core\Field\Attribute\FieldType;
use Drupal\Core\Field\FieldStorageDefinitionInterface;
use Drupal\Core\Field\PreconfiguredFieldUiOptionsInterface;
use Drupal\Core\StringTranslation\TranslatableMarkup;

/**
 * Defines the 'test_field_with_preconfigured_options' entity field item.
 */
class TestItemWithPreconfiguredOptions extends TestItem implements PreconfiguredFieldUiOptionsInterface {
  
  /**
   * {@inheritdoc}
   */
  public static function getPreconfiguredOptions() {
    return [
      'custom_options' => [
        'label' => new TranslatableMarkup('All custom options'),
        'field_storage_config' => [
          'cardinality' => FieldStorageDefinitionInterface::CARDINALITY_UNLIMITED,
          'settings' => [
            'test_field_storage_setting' => 'preconfigured_storage_setting',
          ],
        ],
        'field_config' => [
          'required' => TRUE,
          'settings' => [
            'test_field_setting' => 'preconfigured_field_setting',
          ],
        ],
        'entity_form_display' => [
          'type' => 'test_field_widget_multiple',
        ],
        'entity_view_display' => [
          'type' => 'field_test_multiple',
        ],
      ],
    ];
  }

}