import { Part } from "lit-html";
import { ITest, Properties } from "../typings";
/**
 * Selects a random element and adds it to the DOM.
 */
export declare const experimentElement: (id: string, variations: {
    [tagName: string]: (() => Promise<unknown>) | null;
}, properties?: Properties, test?: ITest) => (part: Part) => Promise<void>;