How to use localtunnel

createTunnel () {
    logger.info('cordova-paramedic: attempt to create local tunnel');

    return Q.Promise((resolve, reject) => {

      const tunnel = localtunnel(this.port, (err, tunnel) => {
        if (err) {
          reject('Unable to create local tunnel: ' + err);
          return;
        }

        this.tunneledUrl = tunnel.url;
        logger.info('cordova-paramedic: using tunneled url ' + this.tunneledUrl);

        resolve(this);
      });

      // this trace is useful to debug test run timeout issue
      tunnel.on('close', function () {
        logger.normal('local-server: local tunnel has been closed');
      });
    });
  }

localtunnel(port, { subdomain: config.get('subdomain') }, (err, tunnel) => {
  if (err) throw err;
  console.log(`Zeeka is live on ${tunnel.url}`);
  opn(tunnel.url);
  tunnel.on('close', () => {
    console.log('File Sharing Stopped');
  });