import { AsyncDirective } from 'lit/async-directive.js';
import { type AsyncState } from './types.js';
/**
 * A directive that renders the resolved value of a promise or async generator.
 */
declare class TrackDirective<T = unknown> extends AsyncDirective {
    private state?;
    private transform;
    private subscriber?;
    private lastRawValue;
    private hasValue;
    render(state: AsyncState<T>, transform?: (value: T) => unknown): unknown;
    disconnected(): void;
    reconnected(): void;
}
export declare const track: <T = unknown>(state: AsyncState<T>, transform?: (value: T) => unknown) => import("lit-html/directive.js").DirectiveResult<typeof TrackDirective>;
export {};
//# sourceMappingURL=track.d.ts.map