TypedDataNormalizer.php

<?php

namespace Drupal\serialization\Normalizer;

use Drupal\Core\TypedData\TypedDataInterface;

/**
 * Converts typed data objects to arrays.
 */
class TypedDataNormalizer extends NormalizerBase {
  
  /**
   * {@inheritdoc}
   */
  public function normalize($object, $format = NULL, array $context = []) : array|string|int|float|bool|\ArrayObject|null {
    $this->addCacheableDependency($context, $object);
    $value = $object->getValue();
    // Support for stringable value objects: avoid numerous custom normalizers.
    if (is_object($value) && method_exists($value, '__toString')) {
      $value = (string) $value;
    }
    return $value;
  }
  
  /**
   * {@inheritdoc}
   */
  public function hasCacheableSupportsMethod() : bool {
    @trigger_error(__METHOD__ . '() is deprecated in drupal:10.1.0 and is removed from drupal:11.0.0. Use getSupportedTypes() instead. See https://www.drupal.org/node/3359695', E_USER_DEPRECATED);
    return TRUE;
  }
  
  /**
   * {@inheritdoc}
   */
  public function getSupportedTypes(?string $format) : array {
    return [
      TypedDataInterface::class => TRUE,
    ];
  }

}