private function createHelperPluginManager(ContainerInterface $container): HelperPluginManager
    {
        $factory = new ViewHelperManagerFactory();
        /** @var HelperPluginManager $helperManager */
        $helperManager = $factory($container, ViewHelperManagerFactory::PLUGIN_MANAGER_CLASS);
        $config = new Config($this->getSpecificConfig($container, 'view_helpers'));
        $config->configureServiceManager($helperManager);
        return $helperManager;
    }