import type { FetchEngine } from '../engine/index.ts';
import type { RetryConfig } from '../types.ts';
export declare const fetchTypes: ("arrayBuffer" | "blob" | "formData" | "json" | "text")[];
export declare const validateOptions: <H, P, S>(opts: FetchEngine.Config<H, P, S>) => void;
export declare const DEFAULT_RETRY_CONFIG: Required<RetryConfig>;