import type Subscription from './subscription';
export declare const DEFAULT_START_DELAY = 5000;
export declare const INACTIVITY_LENIENCY = 22000;
interface OnOrphanFoundHandler {
    (subscription: Subscription): void;
}
/**
 * Finds subscriptions that have become orphaned. This only happens if an open api server goes down, but it requires that
 * the orphaned subscription is restarted. A simpler implementation would be to have a setTimeout/clearTimeout onActivity
 * in each subscription, but this class was abstracted for performance in order to reduce the number of setTimeouts/clearTimeouts
 * - with any number of subscriptions at the smallest refresh interval, with millions of updates per second, this class only
 * checks subscriptions when a new one is started and then once per second overall.
 */
declare class StreamingOrphanFinder {
    subscriptions: Subscription[];
    nextUpdateTime: number;
    onOrphanFound: OnOrphanFoundHandler;
    startDelay: number;
    enabled: boolean;
    nextUpdateTimeoutId: number | null;
    minCheckTime: number;
    constructor(subscriptions: Subscription[], onOrphanFound: OnOrphanFoundHandler, startDelay?: number);
    private onUpdateTimeout;
    /**
     * Starts the orphan-finder.
     * It will delay reporting orphans for a set amount of time
     */
    start(): void;
    stop(): void;
    update(): void;
}
export default StreamingOrphanFinder;