ConfigBuilderGenerator example

    }

    private function createContainerLoader(ContainerBuilder $container, string $env): DelegatingLoader
    {
        $buildDir = $container->getParameter('kernel.build_dir');
        $locator = new FileLocator();
        $resolver = new LoaderResolver([
            new XmlFileLoader($container, $locator, $env),
            new YamlFileLoader($container, $locator, $env),
            new IniFileLoader($container, $locator, $env),
            new PhpFileLoader($container, $locator, $env, new ConfigBuilderGenerator($buildDir)),
            new GlobFileLoader($container, $locator, $env),
            new DirectoryLoader($container, $locator, $env),
            new ClosureLoader($container, $env),
        ]);

        return new DelegatingLoader($resolver);
    }
}

/** * Returns a loader for the container. */
    protected function getContainerLoader(ContainerInterface $container): DelegatingLoader
    {
        $env = $this->getEnvironment();
        $locator = new FileLocator($this);
        $resolver = new LoaderResolver([
            new XmlFileLoader($container, $locator, $env),
            new YamlFileLoader($container, $locator, $env),
            new IniFileLoader($container, $locator, $env),
            new PhpFileLoader($container, $locator, $env, class_exists(ConfigBuilderGenerator::class) ? new ConfigBuilderGenerator($this->getBuildDir()) : null),
            new GlobFileLoader($container, $locator, $env),
            new DirectoryLoader($container, $locator, $env),
            new ClosureLoader($container, $env),
        ]);

        return new DelegatingLoader($resolver);
    }

    private function preBoot(): ContainerInterface
    {
        if ($this->debug) {