import { SynXLib } from './native';
/**
 * User information.
 * @property username           Username.
 * @property registrationTime   Registration time.
 * @property licensed           License state.
 */
export declare type User = {
    username: string;
    registrationTime: string;
    licensed: number;
};
/**
 * An invalid user.
 * @remarks This is used when the user is not authenticated.
 * @internal
 */
export declare const invalidUser: User;
/**
 * Authenticates the user with the Synapse X API.
 * @param library The Synapse X library.
 * @returns A promise that resolves with the user's information.
 */
export declare function authenticate(library: SynXLib): Promise<unknown>;