declare const logtoExpressErrorCodes: Readonly<{
    session_not_configured: "You should configure express-session before using Logto express SDK.";
}>;
export type LogtoClientErrorCode = keyof typeof logtoExpressErrorCodes;
export declare class LogtoExpressError extends Error {
    code: LogtoClientErrorCode;
    data: unknown;
    constructor(code: LogtoClientErrorCode, data?: unknown);
}
export {};