/**
 * Packs a remember-me cookie payload signed with the application secret.
 *
 * @param userId - Authenticated user id.
 * @param plainToken - Plaintext remember selector.
 * @param secret - UTF-8 signing secret.
 */
export declare function packRememberCookie(userId: string | number, plainToken: string, secret: string): string;
/**
 * @param value - Cookie value from the client.
 * @param secret - UTF-8 signing secret.
 * @returns Parsed id + plaintext token when the signature is valid.
 */
export declare function unpackRememberCookie(value: string, secret: string): {
    userId: string | number;
    plainToken: string;
} | null;
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