import { SessionInfo, SAP_B1_Config } from './types.js';
import { AxiosInstance } from 'axios';
export declare class SessionManager {
    private static instance;
    private sessionInfo;
    private config;
    private httpClient;
    private renewalTimer;
    private constructor();
    static getInstance(config?: SAP_B1_Config): SessionManager;
    static resetInstance(): void;
    /**
     * Login to SAP B1 and establish session
     */
    login(): Promise<SessionInfo>;
    /**
     * Logout and terminate session
     */
    logout(): Promise<void>;
    /**
     * Check if current session is valid
     */
    isSessionValid(): Promise<boolean>;
    /**
     * Get current session info
     */
    getSessionInfo(): SessionInfo | null;
    /**
     * Ensure we have a valid session, login if needed
     */
    ensureValidSession(): Promise<SessionInfo>;
    /**
     * Get configured HTTP client with session
     */
    getHttpClient(): Promise<AxiosInstance>;
    /**
     * Renew session before it expires
     */
    private renewSession;
    /**
     * Schedule automatic session renewal
     */
    private scheduleSessionRenewal;
    /**
     * Clear session data and timers
     */
    private clearSession;
    /**
     * Parse SAP error response
     */
    private parseSAPError;
    /**
     * Execute a request with automatic session management
     */
    executeRequest<T>(method: 'GET' | 'POST' | 'PATCH' | 'DELETE', endpoint: string, data?: any, params?: any): Promise<T>;
}