Email Templating Nodejs Helper

Mail.js

const nodemailer = require("nodemailer");
const path = require("path");
const hbs = require("nodemailer-express-handlebars");
const exphbs = require("express-handlebars");
const Handlebars = require("handlebars");
const {
  allowInsecurePrototypeAccess,
} = require("@handlebars/allow-prototype-access");

/** Start Mail Helper */

class Mail {
  constructor() {
    this.mailer;
    this.SUBJECT = "";
    this.FROM = process.env.MAIL_FROM;
    this.DATA = {};
    this.TO = "";
    this.viewEngine;
    this.options;
  }
  subject(subject) {
    this.SUBJECT = subject;
    return this;
  }

  from(from) {
    this.FROM = from;
    return this;
  }

  to(to) {
    this.TO = to;
    return this;
  }
  template(template) {
    this.TEMPLATE = template;
    return this;
  }
  data(data) {
    this.DATA = data;
    return this;
  }
  send() {
    this.mailer = nodemailer.createTransport({
      host: process.env.MAIL_HOST,
      port: process.env.MAIL_PORT,
      secure:
        process.env.MAIL_ENCRYPTION === "ssl" ||
        process.env.MAIL_ENCRYPTION === "tls",
      auth: {
        user: process.env.MAIL_USERNAME,
        pass: process.env.MAIL_PASSWORD,
      },
    });

    this.viewEngine = exphbs.create({
      defaultLayout: false,
      extname: "hbs",
      handlebars: allowInsecurePrototypeAccess(Handlebars),
    });

    this.options = {
      viewEngine: this.viewEngine,
      viewPath: path.join(__dirname, `./views/mails/`),
      extName: ".hbs",
    };

    this.mailer.use("compile", hbs(this.options));

    const mail = {
      from: `"${process.env.APP_NAME}" <${this.FROM}>`,
      to: this.TO,
      subject: this.SUBJECT,
      template: this.TEMPLATE,
      context: this.DATA,
    };

    return this.mailer.sendMail(mail);
  }
}

/** End Mail Helper */

module.exports = { Mail };


/** Usage */

 let mail = new Mail();
  mail.to(user.email)
      .template("verify")
      .subject("Verify Your Email Address")
      .data(mailData)
      .send();