Yii2 asset url resolving

UI.php

    /**
     * @param $url
     * @return string
     * @throws \yii\base\InvalidConfigException
     */
    public static function getAssetUrl($url)
    {
        $class = ArrayHelper::getValue([
            'app-frontend' => \frontend\assets\AppAsset::class,
        ], \Yii::$app->id);

        return \Yii::$app->assetManager->getBundle($class)->baseUrl . $url;
    }