/**
 * XMLHttpRequest module used to send Http requests to listeners.
 */
import { Response } from '../models';
export declare class HttpUtil {
    /**
     * HttpGet method.
     * @param url Endpoint to hit.
     * @param transform Method to transform http response string to desired object.
     */
    static get<T>(url: string, transform: (response: any) => T): Promise<Response<T>>;
    /**
     * HttpPost method.
     * @param url Endpoint to hit.
     * @param transform Method to transform http response string to desired object.
     * @param data Data to post.
     */
    static post<T>(url: string, transform: (response: any) => T, data?: any): Promise<Response<T>>;
    static httpRequest<T>(url: string, transform: (response: any) => T, method: string, data?: any): Promise<Response<T>>;
    /**
     * Converts response data into error model if the call failed safely.
     * @param httpResponse response data
     */
    static errorResponse(httpResponse: any): string;
    /**
     * Checks for existing token in local storage and adds it to outgoing request headers.
     * @param request The request to which the token will be added as header.
     */
    static addTokenToHeader(request: XMLHttpRequest): void;
    /**
     * Reads all response headers if token is present, sets token to local storage.
     * @param request request containing the response headers.
     */
    static persistTokentoLocalStorage(request: XMLHttpRequest): void;
}