How to save a webpage as PDF file and send via email using Puppeteer and Nodemailer.js

const puppeteer = require("puppeteer");
const nodemailer = require("nodemailer");

class Webpage {
  static async generatePDF(url) {
    const browser = await puppeteer.launch({ headless: true }); // Puppeteer can only generate pdf in headless mode.
    const page = await browser.newPage();
    await page.goto(url, {
      waitUntil: "networkidle",
      networkIdleTimeout: 5000
    }); // Adjust network idle as required.
    const pdfConfig = {
      format: "A4",
      printBackground: true,
      margin: {
        // Word's default A4 margins
        top: "2.54cm",
        bottom: "2.54cm",
        left: "2.54cm",
        right: "2.54cm"
      }
    };
    await page.emulateMedia("screen");
    const pdf = await page.pdf(pdfConfig); // Return the pdf buffer. Useful for saving the file not to disk.

    await browser.close();

    return pdf;
  }
}

class Email {
  static sendEmail(to, subject, text, filename, fileContent) {
    const transporter = nodemailer.createTransport({
      host: "smtp.office365.com",
      port: 587,
      secureConnection: true, // Used for Office 365
      tls: { ciphers: "SSLv3" }, // Used for Office 365
      auth: {
        user: "user", // Update username
        pass: "pass" // Update password
      }
    });

    const mailOptions = {
      from: "from@email.com", // Update from email
      to: to,
      subject: subject,
      text: text,
      attachments: [
        {
          filename: filename,
          content: fileContent
        }
      ]
    };

    transporter.sendMail(mailOptions, (error, info) => {
      if (error) {
        return console.log(error);
      }

      console.log("Message sent: %s", info.messageId);
    });
  }
}

(async () => {
  const url =
    "https://ia601405.us.archive.org/18/items/alicesadventures19033gut/19033-h/19033-h.htm";
  const buffer = await Webpage.generatePDF(url);
  Email.sendEmail(
    "to@email.com", // Update to email
    "Alice in Wonderland",
    "I thought you might enjoy this book!",
    "Alice in Wonderland.pdf",
    buffer
  );
})();