export interface AuthenticationResult {
    success: boolean;
    userId?: string;
    message: string;
}
export interface AuthInfo {
    isAuthenticated: boolean;
    expiresAt?: Date;
    supabaseUserId?: string;
    tokenPath: string;
}
export declare class SupabaseAuth {
    private tokenManager;
    private logger;
    constructor();
    /**
     * PKCE utilities - EXACT PORT from frontend
     */
    private generateCodeVerifier;
    private generateCodeChallenge;
    private generateState;
    /**
     * Main OAuth authentication flow - adapted from frontend API routes
     */
    authenticate(): Promise<AuthenticationResult>;
    /**
     * Token exchange - EXACT PORT from frontend callback route
     */
    private exchangeCodeForTokens;
    /**
     * Check authentication status
     */
    isAuthenticated(): Promise<boolean>;
    /**
     * Get current authentication info
     */
    getAuthInfo(): Promise<AuthInfo>;
    /**
     * Clear authentication (logout)
     */
    logout(): Promise<boolean>;
    /**
     * Refresh tokens if needed
     */
    ensureValidToken(): Promise<string | null>;
}