mrp/server/src/lib/pdf.ts

import puppeteer from "puppeteer";

import { env } from "../config/env.js";

export async function renderPdf(html: string) {
  const browser = await puppeteer.launch({
    executablePath: env.PUPPETEER_EXECUTABLE_PATH,
    headless: true,
    args: ["--no-sandbox", "--disable-setuid-sandbox", "--disable-dev-shm-usage"],
  });

  try {
    const page = await browser.newPage();
    await page.setContent(html, { waitUntil: "networkidle0" });

    const pdf = await page.pdf({
      format: "A4",
      printBackground: true,
      preferCSSPageSize: true,
    });

    // Normalize Puppeteer's Uint8Array output to a Node Buffer so Express sends a valid PDF payload.
    return Buffer.from(pdf);
  } finally {
    await browser.close();
  }
}