import { Body, Form, Json, Text } from "../Body.js";
import { Init } from "../Fetch.js";
export declare function isBody(input: unknown): input is Body;
export declare function text(input: string): Text;
export declare function json(input: object): Json;
export declare function form(input: FormData | Record<string, string | Array<unknown>>): Form;
export declare function prepare(init: Init): {
    body: BodyInit | null | undefined;
    headers: HeadersInit | undefined;
    cache?: RequestCache;
    credentials?: RequestCredentials;
    integrity?: string;
    keepalive?: boolean;
    method?: string;
    mode?: RequestMode;
    priority?: RequestPriority;
    redirect?: RequestRedirect;
    referrer?: string;
    referrerPolicy?: ReferrerPolicy;
    signal?: AbortSignal | null;
    window?: null;
};