Implement a mailing solution in Express nodejs

I'm creating an API that handles account verification via email, password recovery and possibly other things.

I want to create one place to send emails across my entire API.
i'm using nodeMailer.

My current setup is i'm a calling a method on the user model that send EmailVerification email.

I want to create a template outside the User model that could send either password recovery, email verification or other things.. Depending on the params that i pass to the function.
My user model:

userSchema.methods.generateEmailVerificationToken = function()
const token = jwt.sign(_id: this._id, role: this.role,
config.get('jwtPrivateKey'));
return token;
;

userSchema.methods.generateAuthToken = function()
const token = jwt.sign(_id: this._id, role: this.role,
config.get('jwtPrivateKey'));
return token;
;

userSchema.methods.sendEmailVerification = function (user)
sendMail(user);
;


and this is my sendMail function:

const nodemailer = require('nodemailer');

module.exports = function sendMail (user)

const transporter = nodemailer.createTransport(
service: 'gmail',
auth:
user: 'mymail@gmail.com',
pass: 'mypass'

);

const mailOptions =
from: 'mymail@gmail.com',
to: user.email,
subject: 'Email verification.',
html: `Please click this <a href="www.example.com/email_verif/$user.emailVerificationToken">link</a> to verify your email`
;

transporter.sendMail(mailOptions, function(error, info)
if (error)
console.log(error);
else
console.log('Email sent: ' + info.response);

);



Thank you

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