import type { Encryption } from '@adonisjs/encryption';
/**
 * Encrypt a value to be set as cookie
 */
export declare function pack(key: string, value: any, encryption: Encryption): null | string;
/**
 * Returns a boolean, if the unpack method from this module can attempt
 * to unpack encrypted value.
 */
export declare function canUnpack(encryptedValue: string): boolean;
/**
 * Attempts to unpack the encrypted cookie value. Returns null, when fails to do so.
 * Only call this method, when `canUnpack` returns true, otherwise runtime
 * exceptions can be raised.
 */
export declare function unpack(key: string, encryptedValue: string, encryption: Encryption): null | any;