import type { QrError, QrErrorCode, Result } from "../types/index.js";
/**
 * Typed error used by qr-core for validation and encoding failures.
 */
export declare class QrException extends Error implements QrError {
    readonly code: QrErrorCode;
    readonly details?: unknown;
    constructor(code: QrErrorCode, message: string, details?: unknown);
}
/**
 * Helper to construct a successful Result.
 */
export declare function ok<T>(value: T): Result<T, never>;
/**
 * Helper to construct a failed Result.
 */
export declare function err<E>(error: E): Result<never, E>;