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

export function getDateFilterDateDataSet(filter: AFM.DateFilterItem): AFM.ObjQualifier {
    if (AFM.isRelativeDateFilter(filter)) {
        return filter.relativeDateFilter.dataSet;
    }
    if (AFM.isAbsoluteDateFilter(filter)) {
        return filter.absoluteDateFilter.dataSet;
    }
    throw new Error("Unsupported type of date filter");
}

private sanitizeFilter(filter: AFM.CompatibilityFilter): ExecuteAFM.CompatibilityFilter | null {
        if (AFM.isAttributeFilter(filter)) {
            return convertAttributeFilter(filter);
        } else if (AFM.isAbsoluteDateFilter(filter)) {
            return convertAbsoluteDateFilter(filter);
        } else if (AFM.isRelativeDateFilter(filter)) {
            return convertRelativeDateFilter(filter);
        }
        return filter;
    }
}