import { Disposable } from 'vscode-jsonrpc';
import { SshClientSession, SshSessionConfiguration, Stream, CancellationToken, Trace } from '@microsoft/dev-tunnels-ssh';
/**
 * Enables opening an SSH session over a TCP connection.
 *
 * It's possible to create an `SshClientSession` over any `Stream` instance;
 * this class is merely a convenient helper that manages creating a session
 * over a Node.js TCP `Socket`.
 */
export declare class SshClient implements Disposable {
    private config;
    private static readonly defaultServerPort;
    private readonly sessions;
    constructor(config: SshSessionConfiguration);
    /**
     * Gets or sets a function that handles trace messages associated with the client session.
     *
     * By default, no messages are traced. To enable tracing, set this property to a function
     * that routes the message to console.log, a file, or anywhere else.
     *
     * @param level The level of message being traced: error, warning, info, or verbose.
     * @param eventId An integer that identifies the type of event. Normally this is one of
     * the values from `SshTraceEventIds`, but extensions may define additional event IDs.
     * @param msg A description of the event (non-localized).
     * @param err Optional `Error` object associated with the event, often included with
     * warning or error events. While the `Error.message` property is typically included as
     * (part of) the `msg` parameter, the error object may contain additional useful context
     * such as the stack trace.
     */
    trace: Trace;
    openSession(serverHost: string, serverPort?: number, cancellation?: CancellationToken): Promise<SshClientSession>;
    protected openConnection(serverHost: string, serverPort?: number, cancellation?: CancellationToken): Promise<Stream>;
    reconnectSession(session: SshClientSession, serverHost: string, serverPort?: number, cancellation?: CancellationToken): Promise<void>;
    dispose(): void;
}
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