/**
 * SSH trace event level.
 */
export declare enum TraceLevel {
    Error = "error",
    Warning = "warning",
    Info = "info",
    Verbose = "verbose"
}
/**
 * Signature for a function that handles SSH trace events.
 *
 * @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.
 */
export type Trace = (level: TraceLevel, eventId: number, msg: string, err?: Error) => void;
export declare class SshTraceEventIds {
    static readonly unknownError: number;
    static readonly streamReadError: number;
    static readonly streamWriteError: number;
    static readonly streamCloseError: number;
    static readonly sendMessageFailed: number;
    static readonly receiveMessageFailed: number;
    static readonly handleMessageFailed: number;
    static readonly serverAuthenticationFailed: number;
    static readonly clientAuthenticationFailed: number;
    static readonly authenticationError: number;
    static readonly channelWindowAdjustFailed: number;
    static readonly channelWaitForWindowAdjust: number;
    static readonly sessionReconnectInitFailed: number;
    static readonly serverSessionReconnectFailed: number;
    static readonly clientSessionReconnectFailed: number;
    static readonly sessionRequestFailed: number;
    static readonly channelRequestFailed: number;
    static readonly serverListenFailed: number;
    static readonly portForwardServerListenFailed: number;
    static readonly portForwardRequestInvalid: number;
    static readonly portForwardChannelInvalid: number;
    static readonly portForwardChannelOpenFailed: number;
    static readonly portForwardConnectionFailed: number;
    static readonly metricsError: number;
    static readonly protocolVersion: number;
    static readonly sendingMessage: number;
    static readonly receivingMessage: number;
    static readonly sendingChannelData: number;
    static readonly receivingChannelData: number;
    static readonly sessionEncrypted: number;
    static readonly sessionAuthenticating: number;
    static readonly sessionAuthenticated: number;
    static readonly sessionClosing: number;
    static readonly sessionConnecting: number;
    static readonly channelOpened: number;
    static readonly channelOpenFailed: number;
    static readonly channelEofReceived: number;
    static readonly channelClosed: number;
    static readonly serverListening: number;
    static readonly serverClientConnected: number;
    static readonly portForwardServerListening: number;
    static readonly portForwardConnectionAccepted: number;
    static readonly portForwardChannelOpened: number;
    static readonly portForwardChannelClosed: number;
    static readonly portForwardConnectionOpened: number;
    static readonly portForwardConnectionClosed: number;
    static readonly sessionDisconnected: number;
    static readonly clientSessionReconnecting: number;
    static readonly serverSessionReconnecting: number;
    static readonly clientSessionStartReconnecting: number;
    static readonly algorithmNegotiation: number;
    static readonly debugMessage: number;
}
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