/** Canonical domain-error codes carried by every {@link AppError}. */
export declare const ErrorCode: {
    readonly NotFound: "NOT_FOUND";
    readonly Validation: "VALIDATION";
    readonly Conflict: "CONFLICT";
    readonly Internal: "INTERNAL";
};
/** Union of all values in the {@link ErrorCode} const object. */
export type ErrorCode = (typeof ErrorCode)[keyof typeof ErrorCode];
/** Base application error: holds a machine-readable {@link ErrorCode} `code`. */
export declare class AppError extends Error {
    readonly code: ErrorCode;
    constructor(code: ErrorCode, message: string);
}
/** Specialized {@link AppError} for "not found" scenarios. Carries `ErrorCode.NotFound`. */
export declare class NotFoundError extends AppError {
    constructor(message: string);
}
/** Specialized {@link AppError} for validation failures. Carries `ErrorCode.Validation`. */
export declare class ValidationError extends AppError {
    constructor(message: string);
}
/** Specialized {@link AppError} for resource conflicts. Carries `ErrorCode.Conflict`. */
export declare class ConflictError extends AppError {
    constructor(message: string);
}
/** Specialized {@link AppError} for unexpected internal failures. Carries `ErrorCode.Internal` and an optional root `cause`. */
export declare class InternalError extends AppError {
    readonly cause?: unknown | undefined;
    constructor(message: string, cause?: unknown | undefined);
}
/** Type guard: narrows an unknown error value to {@link AppError}. */
export declare function isAppError(error: unknown): error is AppError;
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