import { IExternalEventSource, EventSourceOpenParametersType } from '@kameleoon/javascript-sdk-core/browser';
export declare class KameleoonEventSource implements IExternalEventSource {
    private eventSource?;
    open({ eventType, onEvent, url, }: EventSourceOpenParametersType): void;
    close(): void;
    onError(callback: (error: Event) => void): void;
}