import { AnalyticsRequestClient, IAnalyticsClientOptions } from './analyticsRequestClient';
import { AnyEventResponse, EventType, IRequestPayload } from '../events';
export declare class AnalyticsFetchClient implements AnalyticsRequestClient {
    private opts;
    constructor(opts: IAnalyticsClientOptions);
    sendEvent(eventType: EventType, payload: IRequestPayload): Promise<AnyEventResponse | void>;
    deleteHttpCookieVisitorId(): Promise<void>;
    private shouldAppendVisitorId;
    private getVisitorIdParam;
    private getHeaders;
}