import { Participant as Ptpt } from "@empirica/tajriba";
import { Json } from "./json";
import { Player } from "./player";
export declare const DefaultURL: string;
export declare const Empirica: {
    sessionLogin(url: string, sessionToken: string, participant: Ptpt): Promise<Player>;
    registerPlayer(url: string, playerIdentifier: string): Promise<[Player, string]>;
    globalAttributes(url: string): {
        subscribe: (subscription: Sub) => () => void;
    };
};
export declare type Sub = (value: Json) => void;