import { LinkedListNode } from 'dbl-linked-list-ds';
import { SubscriberFunctionReturnType } from './SubscriberFunction';
import { ISubscription } from './Subscription';
export interface ISubscription {
    unsubscribe(): void;
    readonly closed: boolean;
}
export declare class Subscription implements ISubscription {
    private dispose;
    closed: boolean;
    constructor(dispose: SubscriberFunctionReturnType);
    unsubscribe(): void;
}
export declare class CompositeSubscription implements ISubscription {
    closed: boolean;
    private subscriptions;
    constructor();
    head(): LinkedListNode<ISubscription> | undefined;
    tail(): LinkedListNode<ISubscription> | undefined;
    add(d: ISubscription): LinkedListNode<ISubscription>;
    remove(d?: LinkedListNode<ISubscription>): number | void;
    length(): number;
    unsubscribe(): void;
}