type Severity = "info" | "warn" | "error" | "fatal";
interface AppErrorOptions {
    cause?: unknown;
    data?: unknown;
    tags?: string[];
    severity?: Severity;
    status?: number;
    retryable?: boolean;
    captureStack?: boolean;
}
declare class AppError extends Error {
    readonly code: string;
    readonly cause?: unknown;
    readonly data?: unknown;
    readonly status?: number;
    readonly tags: readonly string[];
    readonly severity: Severity;
    readonly retryable: boolean;
    readonly id: string;
    readonly timestamp: number;
    constructor(code: string, message?: string, options?: AppErrorOptions);
    toJSON(): Record<string, unknown>;
}
declare function error(code: string, message?: string, options?: AppErrorOptions): AppError;
declare function wrap(err: unknown, code?: string, options?: Omit<AppErrorOptions, "cause">): AppError;
declare function fromUnknown(value: unknown): AppError;
declare function isAppError(value: unknown): value is AppError;
declare function isCode(err: unknown, code: string): boolean;

export { AppError, type AppErrorOptions, type Severity, error, fromUnknown, isAppError, isCode, wrap };