code: private function encode($configuration): string
      {
          if ($configuration instanceof ConfigurationInterface) {
              $configuration = $configuration->toArray();
          }
  
          if (!is_array($configuration)) {
              throw new \InvalidArgumentException('The provided configuration is not an array or an instance of ConfigurationInterface.');
          }
  
          $result = json_encode($configuration, JSON_UNESCAPED_SLASHES | JSON_PRETTY_PRINT);
  
          if ($result !== false) {
              return $result;
          }
  
          throw new \RuntimeException(json_last_error_msg());
      }
docs: Encodes the provided $configuration into a JSON string.
  
  @param array|ConfigurationInterface $configuration
  
  @throws \InvalidArgumentException if the provided configuration is not an array or an instance of ConfigurationInterface
  @throws \RuntimeException if the decoding throwed some errors
  
  @return string