index.js

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

module.exports.html_to_pdf = async ({ templateHtml, dataBinding, options }) => {
  const template = handlebars.compile(templateHtml);
  const finalHtml = encodeURIComponent(template(dataBinding));

  const browser = await puppeteer.launch({
    args: ["--no-sandbox"],
    headless: true,
  });
  const page = await browser.newPage();
  await page.goto(`data:text/html;charset=UTF-8,${finalHtml}`, {
    waitUntil: "networkidle0",
  });

    let pdfBuffer = await page.pdf(options); // based on = pdf(options?: PDFOptions): Promise<Buffer>; from https://pptr.dev/api/puppeteer.page.pdf pdfBuffer will stored the PDF file Buffer content when "path is not provoded" 
   await browser.close();
   return pdfBuffer; // Returning the value when page.pdf promise gets resolved
};