private function getConfigurationFiles()
    {
        $path = $this->configPath;

        if (!is_dir($path)) {
            return [];
        }

        $files = [];
        $phpFiles = Finder::create()->files()->name('*.php')->in($path)->depth(0);

        foreach ($phpFiles as $file) {
            $files[basename($file->getRealPath(), '.php')] = $file->getRealPath();
        }

        return $files;
    }