/**
 * SSHService - SSH connection and operations
 */
import { NodeSSH } from 'node-ssh';
import { SSHConnection } from '../types';
export declare class SSHService {
    private static instance;
    private ssh;
    private connected;
    private constructor();
    static getInstance(): SSHService;
    /**
     * Connect to SSH server
     */
    connect(config: SSHConnection): Promise<void>;
    /**
     * Execute command on remote server
     */
    exec(command: string): Promise<string>;
    /**
     * Upload file to remote server
     */
    uploadFile(localPath: string, remotePath: string): Promise<void>;
    /**
     * Download file from remote server
     */
    downloadFile(remotePath: string, localPath: string): Promise<void>;
    /**
     * Disconnect from SSH server
     */
    disconnect(): void;
    /**
     * Check if connected
     */
    isConnected(): boolean;
    /**
     * Get SSH connection instance
     */
    getConnection(): NodeSSH;
    /**
     * Close all connections (for compatibility with SSHConnectionPool)
     */
    closeAll(): Promise<void>;
}
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