import { Observable, Subscriber, Subscription } from "rxjs";
export interface SubscriberRef {
    observable: Observable<any>;
    subscriber: Subscriber<any>;
    timestamp: number;
    unsubscribed: boolean;
}
export interface SubscriptionRef extends SubscriberRef {
    subscription: Subscription;
}
export declare function isSubscriptionRef(subscriberRef: SubscriberRef): subscriberRef is SubscriptionRef;