export type HttpFetchResponseType = 'json' | 'text' | 'buffer' | 'readable';
export interface HttpFetchOptionsBase<B> {
    url: string | URL;
    family?: 4 | 6;
    method?: string;
    headers?: HeadersInit;
    signal?: AbortSignal;
    timeout?: number;
    rejectUnauthorized?: boolean;
    /**
     * Checks the status code. Defaults to true.
     */
    checkStatusCode?: boolean | ((statusCode: number) => boolean);
    body?: B | string | ArrayBufferView | any;
    withCredentials?: boolean;
}
export interface HttpFetchJsonOptions<B> extends HttpFetchOptionsBase<B> {
    responseType: 'json';
}
export interface HttpFetchBufferOptions<B> extends HttpFetchOptionsBase<B> {
    responseType: 'buffer';
}
export interface HttpFetchDefaultOptions<B> extends HttpFetchOptionsBase<B> {
    responseType?: undefined;
}
export interface HttpFetchTextOptions<B> extends HttpFetchOptionsBase<B> {
    responseType: 'text';
}
export interface HttpFetchReadableOptions<B> extends HttpFetchOptionsBase<B> {
    responseType: 'readable';
}
export type HttpFetchOptions<B> = HttpFetchJsonOptions<B> | HttpFetchBufferOptions<B> | HttpFetchDefaultOptions<B> | HttpFetchTextOptions<B> | HttpFetchReadableOptions<B>;
export declare function fetchStatusCodeOk(statusCode: number): boolean;
export declare function checkStatus(statusCode: number): boolean;
export declare function getFetchMethod(options: HttpFetchOptions<any>): string;
export interface HttpFetchResponse<T> {
    statusCode: number;
    headers: Headers;
    body: T;
}
export type fetcher<B, M> = <T extends HttpFetchOptions<B>>(options: T) => Promise<HttpFetchResponse<T extends HttpFetchBufferOptions<B> ? Buffer : T extends HttpFetchTextOptions<B> ? string : T extends HttpFetchReadableOptions<B> ? M : T extends HttpFetchJsonOptions<B> ? any : Buffer>>;
export declare function getHttpFetchAccept(responseType: HttpFetchResponseType | undefined): "application/json" | "text/plain";
export declare function hasHeader(headers: [string, string][], key: string): [string, string];
export declare function removeHeader(headers: [string, string][], key: string): void;
export declare function setHeader(headers: [string, string][], key: string, value: string): void;
export declare function setDefaultHttpFetchAccept(headers: [string, string][], responseType: HttpFetchResponseType | undefined): void;
export declare function createHeadersArray(headers: HeadersInit | undefined): [string, string][];
/**
 *
 * @param headers
 * @param body
 * @returns Returns the body and Content-Type header that was set.
 */
export declare function createStringOrBufferBody(headers: [string, string][], body: any): any;
export declare function domFetchParseIncomingMessage(response: Response, responseType: HttpFetchResponseType | undefined): Promise<any>;
export declare function domFetch<T extends HttpFetchOptions<BodyInit>>(options: T): Promise<HttpFetchResponse<T extends HttpFetchBufferOptions<BodyInit> ? Buffer : T extends HttpFetchTextOptions<BodyInit> ? string : T extends HttpFetchReadableOptions<BodyInit> ? Response : T extends HttpFetchJsonOptions<BodyInit> ? any : Buffer>>;