How to use the @gooddata/typings.AFM.isDateFilter function in @gooddata/typings

afmFilters = afmFilters.filter(filter => {
            if (AFM.isDateFilter(filter)) {
                return !dateFiltersDataSetsMatch(filter, dateFilter);
            }
            return true;
        });
    }

    const afmNonDateFilters = afmFilters.filter(filter => !AFM.isDateFilter(filter));

export function isDateFilter(filter: AFM.CompatibilityFilter): filter is AFM.DateFilterItem {
    return AFM.isDateFilter(filter);
}