public static function get(string $asset_type, string $namespace) : array
    {
        $assets = [];

        // is there some registered $assets for current $namespace ?
        if (isset(Assets::$assets[$namespace])
            && isset(Assets::$assets[$namespace][$asset_type])
            && count(Assets::$assets[$namespace][$asset_type]) > 0) {

            // Get all $assets for given $namespace and $asset_type.
            $assets = Assets::$assets[$namespace][$asset_type];

            // Sort $assets by priority from low to high
            ksort($assets);
        }

        // Return $assets
        return $assets;
    }