/** Generate multi-precision g-tag ladder for Nostr event publishing. */
export declare function createGTagLadder(geohash: string, minPrecision?: number): string[][];
/**
 * Extract and parse g tags from a Nostr event's tag array.
 * Invalid geohashes (containing non-base32 characters) are silently filtered out,
 * since relay data is untrusted. Empty strings are also excluded.
 */
export declare function parseGTags(tags: string[][]): Array<{
    geohash: string;
    precision: number;
}>;
/** Return the highest-precision g tag from an event's tag array. */
export declare function bestGeohash(tags: string[][]): string | undefined;
/** Expand geohash into concentric rings of neighbours. Max 10 rings. */
export declare function expandRings(hash: string, rings?: number): string[][];
/** Generate a #g filter for Nostr REQ from coordinates and radius. */
export declare function createGTagFilter(lat: number, lon: number, radiusMetres: number): {
    '#g': string[];
};
/** Generate a #g filter from an existing geohash set. */
export declare function createGTagFilterFromGeohashes(hashes: string[]): {
    '#g': string[];
};
/** Convenience: encode + expand rings + flatten to filter. */
export declare function nearbyFilter(lat: number, lon: number, options?: {
    precision?: number;
    rings?: number;
}): {
    '#g': string[];
};
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