/**
 * Fetches the FHE key set from the FheKeyRegistry contract
 *
 * @param keyId - The unique identifier of the FHE key set
 * @returns A promise resolving to the FHE key set associated with the provided keyId
 * @throws {Error} If there is an issue fetching the key set
 */
export declare function fetchFheKeySet(keyId: bigint): Promise<any>;