import type { LitElement } from 'lit';
import { QueryClient } from '@tanstack/query-core';
export declare const sharedQueryClient: QueryClient;
export type Constructor<T = object> = new (...args: any[]) => T;
export interface QueryClientHost {
    queryClient: QueryClient;
}
export declare const QueryClientMixin: <T extends Constructor<LitElement>>(Base: T) => T & Constructor<QueryClientHost>;