export interface PincodeData {
    district: string;
    block: string;
    state: string;
    [key: string]: string;
}
/**
 * Loads pincode data with in-memory caching
 * @param jsonPath Optional path to a custom JSON file
 */
export declare function loadPincodeData(jsonPath?: string): {
    [key: string]: PincodeData;
};
/**
 * Clear all cached data
 */
export declare function clearCache(): void;
/**
 * Get full address details for a pincode
 * @param pincode 6-digit PIN code
 * @returns Address object or null if not found
 * @throws Error if the pincode is not a valid 6-digit number.
 */
export declare function pinToAddress(pincode: number): PincodeData | null;
/**
 * Get state for a pincode
 * @param pincode 6-digit PIN code
 * @returns State name or null if not found
 * @throws Error if the pincode is not a valid 6-digit number.
 */
export declare function pinToState(pincode: number): string | null;
/**
 * Get district for a pincode
 * @param pincode 6-digit PIN code
 * @returns District name or null if not found
 * @throws Error if the pincode is not a valid 6-digit number.
 */
export declare function pinToDistrict(pincode: number): string | null;
/**
 * Get taluka/block for a pincode
 * @param pincode 6-digit PIN code
 * @returns Taluka/Block name or null if not found
 * @throws Error if the pincode is not a valid 6-digit number.
 */
export declare function pinToTaluka(pincode: number): string | null;