/**
 * Generate a JWT token for a given user ID.
 * @param userId - The ID of the user.
 * @returns The generated JWT token.
 */
export declare const generateToken: (userId: string) => string;
/**
 * Verify a JWT token and extract the user ID.
 * @param token - The JWT token to verify.
 * @returns The decoded token if valid, or throws an error.
 */
export declare const verifyToken: (token: string) => any;