export declare class FronteggAuthenticator {
    accessToken: string;
    private accessTokenExpiry;
    private clientId;
    private apiKey;
    private refreshTimeout;
    private shuttingDown;
    init(clientId: string, apiKey: string): Promise<any>;
    refreshAuthentication(): Promise<void>;
    validateAuthentication(): Promise<void>;
    shutdown(): Promise<void>;
    private authenticate;
}