/**
 * SpatialHash.ts
 *
 * Grid-based spatial hash for broad-phase collision detection:
 * insert/remove/query, cell management, and neighbor iteration.
 *
 * @module physics
 */
export interface SpatialEntry {
    id: string;
    x: number;
    y: number;
    z: number;
    radius: number;
}
export declare class SpatialHash {
    private cellSize;
    private cells;
    private entries;
    constructor(cellSize: number);
    insert(entry: SpatialEntry): void;
    remove(id: string): void;
    update(id: string, x: number, y: number, z: number): void;
    queryPoint(x: number, y: number, z: number): string[];
    queryRadius(x: number, y: number, z: number, radius: number): string[];
    getNearbyPairs(): Array<[string, string]>;
    private getCellsForEntry;
    private cellKey;
    getEntryCount(): number;
    getCellCount(): number;
    clear(): void;
}
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