Nodemailer l'utilisation de gmail, Ne peut pas créer de la propriété 'mailer' string 'SMTP'

Je suis en train d'envoyer les données du formulaire que j'ai créé à mon compte gmail, en cliquant sur le bouton soumettre, je reçois toujours le même message d'erreur.
J'ai trouvé beaucoup de questions à propos de nodemailer, mais aucun d'entre eux semblent être la même question que je suis en train de vivre.

Bien sûr, j'ai dit à mon clientId, mais simplement supprimé pour ce poste.

TypeError: Cannot create property 'mailer' on string 'SMTP'
at Mail (C:\Users\snowr\Documents\dev\zorgkaartnl\zorgkaartnl\node_modules\nodemailer\lib\mailer\index.js:45:33)
   at Object.module.exports.createTransport (C:\Users\snowr\Documents\dev\zorgkaartnl\zorgkaartnl\node_modules\nodemailer\lib\nodemailer.js:46:14)
   at C:\Users\snowr\Documents\dev\zorgkaartnl\zorgkaartnl\src\app.js:39:26
   at Layer.handle [as handle_request] (C:\Users\snowr\Documents\dev\zorgkaartnl\zorgkaartnl\node_modules\express\lib\router\layer.js:95:5)
   at next (C:\Users\snowr\Documents\dev\zorgkaartnl\zorgkaartnl\node_modules\express\lib\router\route.js:131:13)
   at Route.dispatch (C:\Users\snowr\Documents\dev\zorgkaartnl\zorgkaartnl\node_modules\express\lib\router\route.js:112:3)
   at Layer.handle [as handle_request] (C:\Users\snowr\Documents\dev\zorgkaartnl\zorgkaartnl\node_modules\express\lib\router\layer.js:95:5)
   at C:\Users\snowr\Documents\dev\zorgkaartnl\zorgkaartnl\node_modules\express\lib\router\index.js:277:22
   at Function.process_params (C:\Users\snowr\Documents\dev\zorgkaartnl\zorgkaartnl\node_modules\express\lib\router\index.js:330:12)
   at next (C:\Users\snowr\Documents\dev\zorgkaartnl\zorgkaartnl\node_modules\express\lib\router\index.js:271:10)
   at serveStatic (C:\Users\snowr\Documents\dev\zorgkaartnl\zorgkaartnl\node_modules\express\node_modules\serve-static\index.js:75:16)
   at Layer.handle [as handle_request] (C:\Users\snowr\Documents\dev\zorgkaartnl\zorgkaartnl\node_modules\express\lib\router\layer.js:95:5)
   at trim_prefix (C:\Users\snowr\Documents\dev\zorgkaartnl\zorgkaartnl\node_modules\express\lib\router\index.js:312:13)
   at C:\Users\snowr\Documents\dev\zorgkaartnl\zorgkaartnl\node_modules\express\lib\router\index.js:280:7
   at Function.process_params (C:\Users\snowr\Documents\dev\zorgkaartnl\zorgkaartnl\node_modules\express\lib\router\index.js:330:12)
   at next (C:\Users\snowr\Documents\dev\zorgkaartnl\zorgkaartnl\node_modules\express\lib\router\index.js:271:10)

c'est mon app.js:

//require modules
const express = require('express');
const app = express();
const pug = require('pug');
const fs = require('fs')
const bodyParser = require('body-parser');
const pg = require('pg');
const nodemailer = require('nodemailer');
const xoauth2 = require('xoauth2');
//set view engine and views
app.set('views', 'src/views');
app.set('view engine', 'pug');
app.use(bodyParser.urlencoded({extended: false}));
app.use(express.static('./resources/'));
//display index page
app.get('/', function ( req, res ){
console.log('Index is displayed on localhost');
res.render('index');
});
app.post('/zorginstelling/ziekenhuis-olvg-locatie-west-voorheen-sint-lucas-andreas-ziekenhuis-amsterdam-109428/waardeer', function (req, res) {
var mailOpts, smtpTrans;
console.log('form word gepost')
//Setup Nodemailer transport, I chose gmail. 
smtpTrans = nodemailer.createTransport('SMTP', {
service: 'Gmail',
auth: {
xoauth2: xoauth2.createXOAuth2Generator({
user: '[email protected]',
clientId: '-' ,
clientSecret: '-' ,
refreshToken: '-'
})
}
});
//Mail options
mailOpts = {
from: req.body.rating[name] + ' <' + req.body.rating[email][first] + '>', 
to: '[email protected]',
subject: 'Test',
text: req.body.rating[comment] + req.body.rating[questions][behandeling] + req.body.rating[name]
};
smtpTrans.sendMail(mailOpts, function (error, response) {
//Email not sent
if (error) {
console.log('There was a problem')
}
//Yay!! Email sent
else {
console.log('Email sent!')
}
});
});
var server = app.listen(4000, function () {
console.log('Example app listening on port: ' + server.address().port);
});

OriginalL'auteur Kyle van Til | 2017-02-23