export declare class KeelError extends Error {
    readonly status: number;
    readonly code?: string;
    readonly field?: string;
    readonly details?: unknown;
    /** Retry-After value in seconds, parsed from the response header when available. */
    retryAfter?: number;
    constructor(status: number, message: string, details?: unknown, code?: string, field?: string);
    /** Returns `true` when the HTTP status code is commonly retryable (408, 429, 5xx server errors). */
    get isRetryable(): boolean;
}