TestItemWithDependencies.php

<?php

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

use Drupal\Core\Field\Attribute\FieldType;
use Drupal\Core\Field\FieldDefinitionInterface;
use Drupal\Core\StringTranslation\TranslatableMarkup;

/**
 * Defines the 'test_field_with_dependencies' entity field item.
 */
class TestItemWithDependencies extends TestItem {
  
  /**
   * {@inheritdoc}
   */
  public static function calculateDependencies(FieldDefinitionInterface $field_definition) {
    return [
      'content' => [
        'node:article:uuid',
      ],
    ];
  }

}