code: public function config()
      {
          if (!$this->config) {
              $config = array();
  
              $configFile = $this->getThemesPath()
                  .DIRECTORY_SEPARATOR.$this->getName()
                  .DIRECTORY_SEPARATOR.'theme.config.php';
              if (file_exists($configFile)) {
                  ob_start();
                  set_error_handler(
                      function($errno, $errstr) {
                          throw new \ErrorException($errstr, $errno);
                      },
                      E_ALL
                  );
  
                  $config = include $configFile;
  
                  restore_error_handler();
                  ob_get_clean();
  
                  if (!is_array($config))
                      throw new \Exception('Invalid "'.$this->getName().'" Theme Config File. It must return array.');
              }
  
              $this->config = new Entity($config);
          }
  
          return $this->config;
      }
docs: Get Theme Config Object Entity
  
  @throws \Exception
  @return Entity