export interface PollingObserver {
    observers: PollingUpdateAction[];
    subscribe: (action: PollingUpdateAction) => void;
    unsubscribe: (action: PollingUpdateAction) => void;
}
export declare type PollingUpdateAction = <T>(pollingEvent: T) => void;
export default class LongPollingService {
    private readonly pollingObserver;
    constructor();
    startListening<T>(apiMethod: () => Promise<T>): PollingObserver;
}