import { AsyncDirective } from 'lit-html/async-directive';
import { noChange } from 'lit-html';
interface Unsubscribable {
    unsubscribe(): void;
}
interface Subscribable<T> {
    /** @deprecated Use an observer instead of a complete callback */
    subscribe(next: null | undefined, error: null | undefined, complete: () => void): Unsubscribable;
    /** @deprecated Use an observer instead of an error callback */
    subscribe(next: null | undefined, error: (error: any) => void, complete?: () => void): Unsubscribable;
    /** @deprecated Use an observer instead of a complete callback */
    subscribe(next: (value: T) => void, error: null | undefined, complete: () => void): Unsubscribable;
    subscribe(next?: (value: T) => void, error?: (error: any) => void, complete?: () => void): Unsubscribable;
}
declare class ObserveDirective extends AsyncDirective {
    observable: Subscribable<unknown> | undefined;
    subscription: Unsubscribable;
    render(asyncResult: Subscribable<unknown>): "" | typeof noChange;
    subscribe(observable: Subscribable<unknown>): void;
    disconnected(): void;
    unsubscribe(): void;
    reconnected(): void;
}
export declare const async: (asyncResult: Subscribable<unknown>) => import("lit-html/directive").DirectiveResult<typeof ObserveDirective>;
export {};