protected function afterInstall()
    {
        $configSourceFile = __DIR__ . DIRECTORY_SEPARATOR . 'config.example.php';
        $configTargetFile = \Craft::$app->getConfig()->configDir . DIRECTORY_SEPARATOR . $this->handle . '.php';

        if (!file_exists($configTargetFile)) {
            copy($configSourceFile, $configTargetFile);
        }
    }