import { TimeseriesVariantSlotProps, TimeseriesBandSlotProps } from '../../../../types/timeseries.js';
/**
 * Group the accumulation of values of datapoints by start timestamp.
 * @param timeseries - given (TimeseriesBandSlotProps | TimeseriesVariantSlotProps)[]
 * @param variant -
 * @returns - map of grouped values by timestamp, max values by unit and unique units
 */
export declare function groupValueByTimestamp(timeseries: (TimeseriesBandSlotProps | TimeseriesVariantSlotProps)[], nonStackedMap?: {
    groupedValues: Map<string, number>;
    maxValuesByUnit: Map<string, number>;
    uniqueUnits: Map<string, boolean>;
}): {
    groupedValues: Map<string, number>;
    maxValuesByUnit: Map<string, number>;
    uniqueUnits: Map<string, boolean>;
};