import { QueryParams, SanitizedQueryParams } from "../models/http/params";
/**
 * Performs a fetch, using the polyfill if needed.
 *
 * @internal
 */
export declare function fetch(url: string, queryParams: QueryParams, reqInit: RequestInit): Promise<Response>;
/**
 * Removes params with undefined or null values.
 *
 * @internal
 */
export declare function sanitizeQueryParams(params: QueryParams): SanitizedQueryParams;
/**
 * Updates a url with the given params.
 *
 * @internal
 */
export declare function addParamsToURL(url: string, params: QueryParams): string;