import { AssignedExam } from "../../src/core/assigned_exams";
export type User = {
    email: string;
    participation_token: string;
};
export declare class Participant {
    readonly assigned_exam: AssignedExam;
    server_status: "ok" | "error";
    user?: User;
    private callbacks;
    constructor(assigned_exam: AssignedExam);
    private setUser;
    private removeUser;
    signIn(google_id_token: string, endpoint: string): Promise<void>;
    onUserChange(callback: (participant: Participant) => void): void;
}