declare class FetchUtil {
    private config;
    private getHeaders;
    encodeParams(params: any): string;
    private doFetch;
    /**
     * Fetch data from server.
     * @param {string} url API URL
     * @param {object} options Object options any options to pass to fetch
     * @returns {Promise} Promise<T> Return
     * @example
     *  fetchUtil.get<NotesResponse>(`${flexServiceUrl}/Instances/${instanceSid}/Notes`);
     */
    get<T>(url: string, options?: object): Promise<T>;
    /**
     * Submit a JSON payload to server.
     * @param {string} url API URL
     * @param {object} params Request payload
     * @returns {Promise} Promise<T> Return
     * @example
     *  fetchUtil.post<NotesResponse>(`${flexServiceUrl}/Instances/${instanceSid}/Notes`, params);
     */
    post<T>(url: string, params: any): Promise<T>;
    /**
     * Submit a form data to server.
     * @param {string} url API URL
     * @param {object} params Request payload
     * @returns {Promise} Promise<T> Return
     * @example
     *  fetchUtil.postForm<NotesResponse>(`${flexServiceUrl}/Instances/${instanceSid}/Notes`, params);
     */
    postForm<T>(url: string, params: any): Promise<T>;
}
declare const _default: FetchUtil;
export default _default;