Variable default

default: {
    connect: (
        options: number | ConnectionOptions,
        secureListener?: () => void,
    ) => TLSSocket;
    MockTLSServer: typeof MockTLSServer;
    plainConnect: (
        options: number | SocketConnectOpts & DuplexOptions<Duplex>,
        connectListener?: SocketCallback,
    ) => Duplex;
}