How to use the @electerm/ssh2.Client function in @electerm/ssh2

return new Promise((resolve, reject) => {
      const conn = new Client()
      const opts = Object.assign(
        {
          tryKeyboard: true
        },
        {
          readyTimeout: _.get(initOptions, 'readyTimeout'),
          keepaliveInterval: _.get(initOptions, 'keepaliveInterval'),
          agent: process.env.SSH_AUTH_SOCK,
          algorithms: alg
        },
        _.pick(initOptions, [
          'host',
          'port',
          'username',
          'password',
          'privateKey',

constructor () {
    this.client = new Client()
  }

return new Promise((resolve, reject) => {
        let conn1 = new Client()
        conn1.on('ready', () => {
          conn1.forwardOut(
            '127.0.0.1',
            port,
            nextHostConfig.host,
            nextHostConfig.port,
            (err, stream) => {
              if (err) {
                conn1.end()
                return reject(err)
              }
              return stream
            }
          )
        }).connect({
          ...hostConfig,