streetmerchant/src/notification/email.ts

import {Link, Store} from '../store/model';
import {Print, logger} from '../logger';
import Mail from 'nodemailer/lib/mailer';
import {config} from '../config';
import nodemailer from 'nodemailer';

const {email} = config.notifications;

const transportOptions: any = {};

if (email.username && (email.password || email.smtpAddress)) {
  transportOptions.auth = {};
  transportOptions.auth.user = email.username;
  transportOptions.auth.pass = email.password;
}

if (email.smtpAddress) {
  transportOptions.host = email.smtpAddress;
  transportOptions.port = email.smtpPort;
} else {
  transportOptions.service = 'gmail';
}

export const transporter = nodemailer.createTransport({
  ...transportOptions,
});

export function sendEmail(link: Link, store: Store) {
  if (email.username && (email.password || email.smtpAddress)) {
    logger.debug('↗ sending email');

    const mailOptions: Mail.Options = {
      attachments: link.screenshot
        ? [
            {
              filename: link.screenshot,
              path: `./${link.screenshot}`,
            },
          ]
        : undefined,
      from: email.username,
      subject: Print.inStock(link, store),
      text: Print.productInStock(link),
      to: email.to,
    };

    transporter.sendMail(mailOptions, error => {
      if (error) {
        logger.error("✖ couldn't send email", error);
      } else {
        logger.info('✔ email sent');
      }
    });
  }
}