/**
  * Constructs the Configuration Sync storage comparer.
  *
  * @param \Drupal\Core\Config\StorageInterface $source_storage
  *   Storage object used to read configuration.
  * @param \Drupal\Core\Config\StorageInterface $target_storage
  *   Storage object used to write configuration.
  * @param \Drupal\Core\Config\ConfigManagerInterface $config_manager
  *   The configuration manager.
  * @param \Drupal\config_update\ConfigDiffInterface $config_diff
  *   The config differ.
  */
 public function __construct(StorageInterface $source_storage, StorageInterface $target_storage, ConfigManagerInterface $config_manager, ConfigDiffInterface $config_diff)
 {
     parent::__construct($source_storage, $target_storage, $config_manager);
     $this->configDiff = $config_diff;
 }