import type { Observable, Observer, Subscription } from "@knyt/artisan";
import type { ReactiveController, ReactiveControllerHost } from "./ReactiveController.ts";
/**
 * A controller and observer that requests a host update when a new value is received.
 *
 * @remarks
 *
 * This controller maintains strong references to the observable, host, and itself as the observer.
 * As long as the host is connected, the subscription remains active. By acting as its own observer,
 * the controller ensures it is not garbage collected while attached to the host. When the host is
 * discarded, the observer and its subscription are also discarded.
 */
export declare class HostUpdater implements ReactiveController, Observer<unknown> {
    #private;
    readonly subscription: Subscription;
    constructor(host: ReactiveControllerHost, observable: Observable<unknown>);
    next(): void;
    hostConnected?: () => void;
}
//# sourceMappingURL=HostUpdater.d.ts.map