import { GoogleAuthInfo, Signer, SignerState, TwoFactorAuthConfig } from "@iov/gdrive-custodian";
type VoidCallback = () => void;
export declare class GDriveCustodian {
    private authInfo?;
    protected signer?: Signer;
    initialized: boolean;
    static create(googleClientID: string, mnemonicLength: 12 | 24, signAuthPath: string, twoFactorAuthConfig?: TwoFactorAuthConfig): GDriveCustodian;
    attach(): Promise<void>;
    setStateChangeListener(listener: (state: SignerState, data?: any) => void): void;
    removeStateChangeListener(): void;
    connect(): VoidCallback;
    detach(): void;
    getSigner(): Signer;
    getIdToken(): string;
    /**
     * Call this to respond with a token (TOTP) to custodian in order to move forward with login 2FA flow
     * @param token - provided by user (i.e TOTP)
     */
    authenticateWith2fa(token: string): Promise<void>;
    /**
     * Utility function to validate with 2FA in delicate scenarios
     * This is not required at login flow (implicitly called there)
     * @param token
     * @returns boolean
     */
    validateWith2fa(token: string): Promise<boolean>;
    /**
     * Use this to setup authinfo when SignerState === Authenticated
     * @param authInfo
     */
    setAuthInfo(authInfo: GoogleAuthInfo): void;
}
export {};