export type TOTPErrorCode = 'INVALID_SECRET' | 'INVALID_TOKEN' | 'EXPIRED_TOKEN' | 'INVALID_TIME_STEP' | 'INVALID_DIGITS' | 'INVALID_WINDOW' | 'RATE_LIMIT_EXCEEDED' | 'CRYPTO_NOT_AVAILABLE' | 'DECODE_ERROR' | 'ENCRYPTION_ERROR';
export declare class TOTPError extends Error {
    readonly code: TOTPErrorCode;
    readonly details?: any | undefined;
    constructor(code: TOTPErrorCode, message: string, details?: any | undefined);
    toJSON(): {
        name: string;
        code: TOTPErrorCode;
        message: string;
        details: any;
    };
}
export declare function isTOTPError(error: unknown): error is TOTPError;
export declare function getErrorCode(error: unknown): TOTPErrorCode | null;
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