export interface GeohashBounds {
    minLat: number;
    maxLat: number;
    minLon: number;
    maxLon: number;
}
export type Direction = 'n' | 'ne' | 'e' | 'se' | 's' | 'sw' | 'w' | 'nw';
/** Encode latitude/longitude to a geohash string. Default precision 5 (~4.9km). */
export declare function encode(lat: number, lon: number, precision?: number): string;
/** Decode a geohash to its centre point with error margins. */
export declare function decode(hash: string): {
    lat: number;
    lon: number;
    error: {
        lat: number;
        lon: number;
    };
};
/** Get the bounding rectangle of a geohash cell. */
export declare function bounds(hash: string): GeohashBounds;
/** Get the 32 children of a geohash at the next precision level. */
export declare function children(hash: string): string[];
/** Check if two geohashes overlap (bidirectional prefix containment). */
export declare function contains(a: string, b: string): boolean;
/** Check if a geohash matches any candidate in a multi-precision set. */
export declare function matchesAny(hash: string, candidates: string[]): boolean;
/** Get a single adjacent geohash cell in the given direction. */
export declare function neighbour(hash: string, direction: Direction): string;
/** Get all 8 adjacent geohash cells. */
export declare function neighbours(hash: string): Record<Direction, string>;
/** Haversine distance in metres between two coordinate pairs. */
export declare function distanceFromCoords(lat1: number, lon1: number, lat2: number, lon2: number): number;
/** Haversine distance in metres between centres of two geohash cells. */
export declare function distance(hashA: string, hashB: string): number;
/** Geographic midpoint between two coordinate pairs (spherical interpolation). */
export declare function midpointFromCoords(lat1: number, lon1: number, lat2: number, lon2: number): {
    lat: number;
    lon: number;
};
/** Geographic centroid of N coordinate pairs (spherical vector mean). */
export declare function midpointFromCoordsMulti(points: ReadonlyArray<{
    lat: number;
    lon: number;
}>): {
    lat: number;
    lon: number;
};
/** Geographic midpoint between centres of two geohash cells. */
export declare function midpoint(hashA: string, hashB: string): {
    lat: number;
    lon: number;
};
/** Optimal geohash precision for a given search radius in metres. */
export declare function radiusToPrecision(metres: number): number;
/** Approximate cell radius in metres for a given precision level. */
export declare function precisionToRadius(precision: number): number;
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