/**
 * Whether a numeric HTTP status is in the canonical transient/retryable set:
 * 408 (Request Timeout), 429 (Too Many Requests), and any 5xx.
 *
 * This is a pure predicate over a status code already in hand — distinct from
 * {@link classify}, which inspects a whole error (including message text) and
 * may match more. Use this when you only have a `status: number`.
 */
export declare function isTransientStatus(status: number | undefined): boolean;
/**
 * Whether a provider stream error should be retried against the same credential.
 *
 * Account-level usage/quota limits are deliberately treated as **non**-retryable
 * here — they are owned by the credential-rotation layer (auth-gateway /
 * `streamSimple` a/b/c policy), not this seconds-scale provider backoff.
 *
 * Every 4xx other than 408/429 is terminal: a request the provider rejected
 * as malformed, unauthorized, or unentitled fails identically on replay.
 */
export declare function isProviderRetryableError(error: unknown): boolean;