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;
}
/**
 * Raised when the server returns HTTP 429 (rate-limit throttle) and all
 * retry attempts have been exhausted.  Exposes the throttle-specific fields
 * from the response body so callers can implement custom back-off or
 * surface meaningful messages to end-users.
 */
export declare class ThrottledError extends KeelError {
    /** Seconds the server asked the client to wait before retrying. */
    readonly retryAfterSeconds: number;
    /** Permit ID associated with the throttled request, if available. */
    readonly permitId?: string;
    /** Shape-D reason code, e.g. "budget.rate_limit_throttled". */
    readonly reasonCode?: string;
    constructor(opts: {
        message: string;
        retryAfterSeconds: number;
        permitId?: string;
        reasonCode?: string;
        details?: unknown;
    });
}