code: public function getCodeGenerator(AviatorApp $app) : PhpCodeGenerator
      {
          return new ServiceContainer\ServiceContainerCodeGenerator(
              $app->getConfigBuilder()->build(),
              $this->definition,
              new Fqcn($app->getNamespace(), 'Container'),
              'container'
          );
      }
docs: @param AviatorApp $app
  
  @return PhpCodeGenerator