ShapeItemRequired.php

<?php

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

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

/**
 * Defines the 'shape_required' field type.
 */
class ShapeItemRequired extends ShapeItem {
  
  /**
   * {@inheritdoc}
   */
  public static function propertyDefinitions(FieldStorageDefinitionInterface $field_definition) {
    $properties = parent::propertyDefinitions($field_definition);
    $properties['shape']->setRequired(TRUE);
    return $properties;
  }

}