import { Observable, Subscription } from 'rxjs';
/**
 * A wrapper on RxJS Subscription.
 *
 * Stream is a simple construct that adds the ability to re-subscribe to the provided Observable.
 * Given an Observable, it immediately gets subscribed, and the subscription instance is saved as Stream's property.
 * The Stream keeps the reference to the provided Observable, and uses it for re-subscription when asked.
 *
 * See {@link https://docs.activejs.dev/utilities/stream} for more details.
 *
 * @category 4. Utility
 */
export declare class Stream {
    private observable;
    private _subscription;
    /**
     * The current Subscription instance.
     * It can be `undefined` if there's no active Subscription.
     */
    get subscription(): Subscription;
    /**
     * Indicates whether the Stream is active or not. \
     * i.e.: Whether the provided Observable is subscribed or not.
     */
    get isSubscribed(): boolean;
    /**
     * Given an Observable, subscribes to it immediately, and saves the Subscription instance.
     *
     * @param observable The Observable to be used for subscription.
     */
    constructor(observable: Observable<any>);
    /**
     * Subscribe to the provided Observable, and save the Subscription instance.
     *
     * @returns Subscription instance returned by {@link Observable.subscribe}.
     *
     * @category Common
     */
    private subscribe;
    /**
     * Unsubscribes from current subscription instance using {@link Subscription.unsubscribe}. \
     * It also deletes the Subscription instance.
     *
     * @category Custom Stream
     */
    unsubscribe(): void;
    /**
     * Unsubscribes and then immediately subscribes again,
     * also, replaces the {@link subscription} instance with the new Subscription instance.
     *
     * @returns Subscription instance returned by subscribing to the provided Observable {@link Observable.subscribe}.
     *
     * @category Custom Stream
     */
    resubscribe(): Subscription;
}