types.php

См. документацию.

<?php
 
namespace Bitrix\Landing\Assets;
 
class Types
{
    public const KEY_RELATIVE = 'rel';
    public const TYPE_CSS = 'css';
    public const TYPE_JS = 'js';
    public const TYPE_LANG = 'lang';
    public const TYPE_LANG_ADDITIONAL = 'lang_additional';
    public const TYPE_FONT = 'font';

    public static function getAssetTypes(): array
    {
        return [
            self::KEY_RELATIVE,
            self::TYPE_LANG,
            self::TYPE_JS,
            self::TYPE_CSS,
            self::TYPE_FONT,
        ];
    }
}