import type { Canvas2D, Context2D } from "../canvas-types";
export interface ChromeCacheChart {
    _chromeCanvas: Canvas2D | null;
    _chromeCache: ImageBitmap | null;
    _chromeCacheDirty: boolean;
    _chromeCacheGen: number;
}
/**
 * Run the static-chrome cache pattern shared by sunburst + treemap.
 * Resizes the canvas, paints the static layer (and snapshots it as an
 * `ImageBitmap`) when dirty, otherwise blits the cache; then runs the
 * caller-provided overlay layer for hover/highlight state.
 *
 * Returns the prepared `ctx` already in DPR-scaled space so the overlay
 * callback can paint in CSS pixels — except `null` if either the canvas
 * is missing a 2D context or the chart has nothing to paint.
 */
export declare function withChromeCache(chart: ChromeCacheChart, canvas: Canvas2D, dpr: number, cssWidth: number, cssHeight: number, drawStatic: (ctx: Context2D) => void, drawOverlay: ((ctx: Context2D) => void) | null): void;