/**
 * App hit-testing helpers (spatial index + tree walk).
 */
import type { Group } from '../shapes/Group';
import type { Node } from '../Node';
import type { SpatialIndex } from '../performance/SpatialIndex';
/** Hit-test using spatial index candidates. */
export declare function hitTestSpatial(spatialIndex: SpatialIndex, worldX: number, worldY: number): Node | null;
/** Recursive hit-test walking the scene tree (front-to-back). */
export declare function hitTestNode(group: Group, worldX: number, worldY: number): Node | null;