code: public static function guess($name)
      {
          if (in_array(substr($name, -1), array('/', '\\'))) {
              return 'html'; // return html for directories
          }
  
          if ('.twig' === substr($name, -5)) {
              $name = substr($name, 0, -5);
          }
  
          $extension = pathinfo($name, PATHINFO_EXTENSION);
  
          switch ($extension) {
              case 'js':
                  return 'js';
  
              case 'css':
                  return 'css';
  
              case 'txt':
                  return false;
  
              default:
                  return 'html';
          }
      }
docs: Guesses the best autoescaping strategy based on the file name.
  
  @param string $name The template name
  
  @return string|false The escaping strategy name to use or false to disable