/**
 * 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;
/** Hook for provider-specific transient detection that the error module must not import directly. */
export interface ProviderRetryableHooks {
    /** Provider id of the failing request, used to gate provider-specific checks. */
    provider?: string;
    /** Provider-specific transient predicate (e.g. Copilot `model_not_supported`). */
    isProviderTransient?: (error: Error) => 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.
 *
 * Provider-specific transient cases are injected via {@link ProviderRetryableHooks}
 * so this stays free of provider imports.
 */
export declare function isProviderRetryableError(error: unknown, hooks?: ProviderRetryableHooks): boolean;