import type { Observable } from "@knyt/artisan";
import { type Effect } from "./Effect.ts";
import type { ReactiveControllerHost } from "./ReactiveController.ts";
/**
 * @internal scope: workspace
 */
export type WatchCurriedFn = <T extends Observable<any>>(observable: T) => Effect;
/**
 * Creates an effect that tracks an observable and requests updates
 * on the host whenever the observable emits a new value while the host is connected.
 */
export declare function watch<T extends Observable<any>>(host: ReactiveControllerHost, observable: T): Effect;
export declare function watch(host: ReactiveControllerHost): WatchCurriedFn;
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