public static function get_filetypes_browser_data_parameters() {
        return new external_function_parameters([
            'onlytypes' => new external_value(PARAM_RAW, 'Limit the browser to the given groups and extensions', VALUE_DEFAULT, ''),
            'allowall' => new external_value(PARAM_BOOL, 'Allows to select All file types, does not apply with onlytypes are set.',
                VALUE_DEFAULT, true),
            'current' => new external_value(PARAM_RAW, 'Current types that should be selected.', VALUE_DEFAULT, ''),
        ]);
    }