/**
 * Authentication service for sync functionality
 */
import { AuthInfo } from './types';
/**
 * Authentication service for browser-use sync
 */
export declare class AuthService {
    private static readonly CONFIG_DIR;
    private static readonly AUTH_FILE;
    private static readonly KEY_FILE;
    private authInfo;
    private encryptionKey;
    constructor();
    /**
     * Authenticate with API credentials
     */
    authenticate(apiKey: string, userId?: string): Promise<AuthInfo>;
    /**
     * Get current authentication info
     */
    getAuthInfo(): Promise<AuthInfo | null>;
    /**
     * Check if user is authenticated
     */
    isAuthenticated(): Promise<boolean>;
    /**
     * Logout and clear authentication info
     */
    logout(): Promise<void>;
    /**
     * Refresh authentication token
     */
    refreshToken(): Promise<AuthInfo | null>;
    /**
     * Initialize encryption key for storing auth info
     */
    private initializeEncryptionKey;
    /**
     * Save authentication info to disk (encrypted)
     */
    private saveAuthInfo;
    /**
     * Load authentication info from disk (decrypt)
     */
    private loadAuthInfo;
    /**
     * Check if token is valid (not expired)
     */
    private isTokenValid;
    /**
     * Generate user ID from API key
     */
    private generateUserId;
    /**
     * Encrypt data using the encryption key
     */
    private encrypt;
    /**
     * Decrypt data using the encryption key
     */
    private decrypt;
}
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