import { createTransport } from "nodemailer";
import { PluginFunction } from "nodemailer/lib/mailer";
import inlineCss from "@point-hub/nodemailer-inlinecss";

var transporter = nodemailer.createTransport();
transporter.use('compile', inlineCss() as PluginFunction);
transporter.sendMail({
    from: '...',
    to: '...',
    html: '<style>div { color:black; }</style><div>Hello world</div>'
});

import fs from "fs";
import { createTransport } from "nodemailer";
import { PluginFunction } from "nodemailer/lib/mailer";
import inlineCss from "@point-hub/nodemailer-inlinecss";

var transporter = nodemailer.createTransport();
transporter.use('compile', inlineCss({
    extraCss: fs.readFileSync("./src/styles.min.css").toString(),
}) as PluginFunction);
transporter.sendMail({
    from: '...',
    to: '...',
    html: '<div>Hello world</div>'
});