import { kBackend } from '../constants.js';
import { FetchBackend } from './fetch-backend.js';
import { HttpClientBase } from './http-client-base.js';
/**
 *
 * @class HttpFetchClient
 */
export declare class HttpFetchClient<TRequestOptions extends FetchBackend.RequestOptions = FetchBackend.RequestOptions, TResponseExt = {}> extends HttpClientBase<TRequestOptions, TResponseExt> {
    [kBackend]: FetchBackend;
    constructor(serviceUrl: string, options?: FetchBackend.Options);
    get defaults(): FetchBackend.RequestDefaults;
}