import type { Observable } from "rxjs";
import type { Constructable, StringKey } from "./lang-utils";
import type { AsyncSourceKey } from "./metadata";
type ValidateAsyncSource<T, K extends StringKey<T>, Source extends string | undefined = AsyncSourceKey<T, K>> = Source extends StringKey<T> ? (T[Source] extends Observable<T[K]> ? T[Source] : never) : never;
/** @PropertyDecoratorFactory */
export declare function AsyncState<Source extends string | undefined = undefined>(asyncSource?: Source): <ComponentT extends Constructable<any, any>, K extends StringKey<ComponentT>>(target: Source extends undefined ? ComponentT : (ValidateAsyncSource<ComponentT, K, Source> extends never ? never : ComponentT), key: Source extends undefined ? (ValidateAsyncSource<ComponentT, K> extends never ? never : K) : K) => void;
export {};