How to create module for express-mailer?

I need to create module for this code, please help to change for express.js module? I use basic express-generator.

mailer.extend(app, {
  from: 'mail@mail.com',
  host: 'smtp.gmail.com',
  secureConnection: true, 
  port: 465, 
  transportMethod: 'SMTP', 
  auth: {
    user: 'mail@mail.com',
    pass: 'password'
  }
});

app.get('/ticket', function (req, res, next) {
  app.mailer.send('email', {
    to: 'mail@mail.com', 
    subject: 'Test Email',
    otherProperty: 'Other Property'
  }, function (err) {
    if (err) {
      console.log(err);
      res.send('There was an error sending the email');
      return;
    }
    res.send('Email Sent');
  });
});

via Ooos