import type { SunburstChart } from "./sunburst";
import { type NodeStore } from "../common/node-store";
/**
 * Minimum arc area (in pixels²) below which a subtree stops being
 * subdivided. Keeps the visible count bounded independent of tree
 * size — the core mechanism that lets sunburst scale to 2M nodes.
 */
declare const MIN_VISIBLE_ARC_AREA = 4;
/**
 * Inner radius: reserved for the current-root drill-up target.
 */
declare const INNER_RING_PX = 30;
/**
 * Recursive polar partition writing `(a0, a1, r0, r1)` into the store.
 * The root node's own ring is reserved (inner radius = 0, outer =
 * `INNER_RING_PX`) for the drill-up click target; descendants start at
 * `INNER_RING_PX` and extend out.
 */
export declare function partitionSunburst(store: NodeStore, currentRootId: number, maxRadius: number): void;
/**
 * Walk from `startId` depth-first, emitting every descendant whose
 * arc area exceeds `MIN_VISIBLE_ARC_AREA`.
 *
 * The single-facet entry point; faceted rendering uses
 * {@link collectVisibleArcsAppend} to concatenate across facets.
 */
export declare function collectVisibleArcs(chart: SunburstChart, startId: number): void;
/**
 * Append visible arcs under `startId` to `_visibleNodeIds` starting at
 * `startOffset`, returning the new length.
 */
export declare function collectVisibleArcsAppend(chart: SunburstChart, startId: number, startOffset: number): number;
export { INNER_RING_PX, MIN_VISIBLE_ARC_AREA };