/**
 * Chart tooltip — hit-zone overlays, crosshair, data dots, and tooltip popup.
 *
 * Extracted from charts.ts to keep each file under 700 LOC.
 */
import type { ChartLayout, SeriesEntry } from './chart-helpers.js';
export interface TooltipEntry {
    label: string;
    value: string | number;
    color: string;
}
export interface TooltipCtx {
    wrapper: HTMLElement;
    tooltip: HTMLElement;
    svgEl: SVGSVGElement;
}
/** Create and attach a tooltip div to the chart wrapper. */
export declare function createTooltip(wrapper: HTMLElement, svg: SVGSVGElement): TooltipCtx;
/** Show the tooltip at a position relative to the SVG. */
export declare function showTooltipAt(ctx: TooltipCtx, svgX: number, _svgY: number, categoryLabel: string | undefined, entries: TooltipEntry[]): void;
/** Attach hover hit-zones for bar chart columns. */
export declare function addBarTooltipZones(ctx: TooltipCtx, svg: SVGSVGElement, data: Record<string, unknown>[], series: SeriesEntry[], layout: ChartLayout, xAxisKey: string | undefined, formatValue: (raw: unknown, s: SeriesEntry, si: number) => string, formatLabel?: (raw: unknown) => string): void;
/** Attach hover hit-zones for line/area chart data points. */
export declare function addLineTooltipZones(ctx: TooltipCtx, svg: SVGSVGElement, data: Record<string, unknown>[], allSeries: SeriesEntry[], layout: ChartLayout, xAxisKey: string | undefined, formatValue: (raw: unknown, s: SeriesEntry, si: number) => string, crosshair?: SVGLineElement, dotGroups?: SVGCircleElement[][], formatLabel?: (raw: unknown) => string): void;
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