getConfigForExtension example

foreach ($this->getApplication()->getKernel()->getBundles() as $bundle) {
            $availableBundles[] = $bundle->getName();
        }

        return $availableBundles;
    }

    private function getConfig(ExtensionInterface $extension, ContainerBuilder $container, bool $resolveEnvs = false): mixed
    {
        return $container->resolveEnvPlaceholders(
            $container->getParameterBag()->resolveValue(
                $this->getConfigForExtension($extension, $container)
            ), $resolveEnvs ?: null
        );
    }

    private static function buildPathsCompletion(array $paths, string $prefix = ''): array
    {
        $completionPaths = [];
        foreach ($paths as $key => $values) {
            if (\is_array($values)) {
                $completionPaths += self::buildPathsCompletion($values, $prefix.$key.'.');
            } else {