api/email/Email.ts

import { Meteor } from 'meteor/meteor';
import { Email } from 'meteor/email'; // non-relative module
import { SSR } from 'meteor/meteorhacks:ssr'; // non-relative module
// global for Meteor but you have to declare it in file to use it
/* eslint-disable no-unused-vars */
declare const Assets: any;

// According to https://docs.meteor.com/api/email.html#Email-send
export interface sendEmailParams {
  to: string | string[];
  bcc: string | string[];
  from: string;
  replyTo: string | string[];
  subject: string;
  templateData: any;
  filename: string;
}

/**
 * Email sender to distribute RadGrad newsletter. Utilizes SSR to compile and render HTML/CSS code within the email.
 * @param to The recipient.
 * @param cc The cc recipients.
 * @param from The sender.
 * @param subject The email subject line.
 * @param templateData Custom data to be rendered in the email template. SSR is used to compile and
 * render the final content.
 */
export const sendEmail = ({ to, bcc, from, replyTo, subject, templateData, filename }: sendEmailParams): void => {
  if (Meteor.isServer) {
    SSR.compileTemplate('htmlEmail', Assets.getText(`email/${filename}`));
    const html = SSR.render('htmlEmail', templateData);
    Email.send({
      to,
      bcc,
      replyTo,
      from,
      subject,
      html,
    });
  }
};