import type { HistogramTooltipDataPoint } from '../../components/overlays/utils/bins-to-tooltip.js';
import type { HistogramChartState } from '../../types/state.js';
export declare function reduceClosestBins(prev: HistogramChartState, closestBins?: {
    closestBin: HistogramTooltipDataPoint;
    closestBinsGrouped: HistogramTooltipDataPoint[][];
    closestBinsByVariant: HistogramTooltipDataPoint[];
}): HistogramChartState;