PrivateTempStore.php

<?php

namespace Drupal\user;

use Drupal\Core\TempStore\PrivateTempStore as CorePrivateTempStore;
@trigger_error('\\Drupal\\user\\PrivateTempStore is scheduled for removal in Drupal 9.0.0. Use \\Drupal\\Core\\TempStore\\PrivateTempStore instead. See https://www.drupal.org/node/2935639.', E_USER_DEPRECATED);

/**
 * In order to preserve BC alias the core exception.
 */
if (!class_exists('\\Drupal\\user\\TempStoreException')) {
    class_alias('\\Drupal\\Core\\TempStore\\TempStoreException', '\\Drupal\\user\\TempStoreException');
}

/**
 * Stores and retrieves temporary data for a given owner.
 *
 * @deprecated in drupal:8.5.0 and is removed from drupal:9.0.0.
 *   Use \Drupal\Core\TempStore\PrivateTempStore instead.
 *
 * @see \Drupal\Core\TempStore\PrivateTempStore
 * @see https://www.drupal.org/node/2935639
 */
class PrivateTempStore extends CorePrivateTempStore {

}