import type { Tile } from './hexasphere.types';
/**
 * Pre-computes a neighbour map for all tiles on a hexasphere.
 *
 * Two tiles are neighbours if they share an edge, i.e. at least 2 boundary
 * points with identical coordinates (within 1e-6 precision). This works
 * natively with pentagon tiles (5 edges) and avoids any icosahedron-face
 * bookkeeping.
 *
 * Call once per planet load — O(n * avg_boundary) where n = tile count.
 *
 * @param tiles - All tiles from HexasphereData.
 * @returns Map from tileId to the array of neighbour tileIds.
 */
export declare function buildNeighborMap(tiles: readonly Tile[]): Map<number, number[]>;
/**
 * Returns the direct neighbour tile ids for a given tile.
 *
 * @param tileId      - Source tile id.
 * @param neighborMap - Pre-computed map from buildNeighborMap().
 * @returns Array of neighbour tile ids (5 for pentagons, 6 for hexagons).
 */
export declare function getNeighbors(tileId: number, neighborMap: Map<number, number[]>): number[];
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