import type { HeatmapChart } from "./heatmap";
import type { CategoricalLevel } from "../../axis/categorical-axis";
/**
 * Find the heatmap cell under `(mx, my)`. O(1) via the prebuilt `cells2D`
 * index. Sets `chart._hoveredCell` and schedules a re-render when the
 * hovered cell changes.
 *
 * In multi-facet mode, iterates facets to find the one whose plot rect
 * contains the cursor, then hit-tests against that facet's pipeline.
 */
export declare function handleHeatmapHover(chart: HeatmapChart, mx: number, my: number): void;
/**
 * Format a hierarchical path from a precomputed-label `CategoricalLevel` array.
 */
export declare function formatHierarchicalPath(levels: CategoricalLevel[], idx: number): string;
/**
 * Render a tooltip for the currently hovered cell.
 */
export declare function renderHeatmapTooltip(chart: HeatmapChart): void;