import { SubscriptionLike, TeardownLogic } from './types';
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/**
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* Represents a disposable resource, such as the execution of an Observable. A
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* Subscription has one important method, `unsubscribe`, that takes no argument
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* and just disposes the resource held by the subscription.
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*
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* Additionally, subscriptions may be grouped together through the `add()`
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* method, which will attach a child Subscription to the current Subscription.
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* When a Subscription is unsubscribed, all its children (and its grandchildren)
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* will be unsubscribed as well.
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*
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* @class Subscription
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*/
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export declare class Subscription implements SubscriptionLike {
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/** @nocollapse */
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static EMPTY: Subscription;
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/**
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* A flag to indicate whether this Subscription has already been unsubscribed.
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* @type {boolean}
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*/
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closed: boolean;
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/** @internal */
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protected _parentOrParents: Subscription | Subscription[];
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/** @internal */
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private _subscriptions;
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/**
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* @param {function(): void} [unsubscribe] A function describing how to
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* perform the disposal of resources when the `unsubscribe` method is called.
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*/
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constructor(unsubscribe?: () => void);
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/**
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* Disposes the resources held by the subscription. May, for instance, cancel
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* an ongoing Observable execution or cancel any other type of work that
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* started when the Subscription was created.
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* @return {void}
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*/
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unsubscribe(): void;
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/**
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* Adds a tear down to be called during the unsubscribe() of this
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* Subscription. Can also be used to add a child subscription.
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*
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* If the tear down being added is a subscription that is already
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* unsubscribed, is the same reference `add` is being called on, or is
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* `Subscription.EMPTY`, it will not be added.
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*
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* If this subscription is already in an `closed` state, the passed
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* tear down logic will be executed immediately.
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*
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* When a parent subscription is unsubscribed, any child subscriptions that were added to it are also unsubscribed.
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*
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* @param {TeardownLogic} teardown The additional logic to execute on
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* teardown.
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* @return {Subscription} Returns the Subscription used or created to be
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* added to the inner subscriptions list. This Subscription can be used with
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* `remove()` to remove the passed teardown logic from the inner subscriptions
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* list.
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*/
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add(teardown: TeardownLogic): Subscription;
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/**
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* Removes a Subscription from the internal list of subscriptions that will
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* unsubscribe during the unsubscribe process of this Subscription.
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* @param {Subscription} subscription The subscription to remove.
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* @return {void}
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*/
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remove(subscription: Subscription): void;
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}
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