/**
* Markdown to PDF renderer for document export.
*
* Converts markdown content to styled HTML via `marked`, then renders
* the HTML to a PDF buffer using Playwright headless Chromium.
* The HTML template uses print-friendly styling that matches the
* document editor typography.
*/
import { marked } from "marked";
import {
ensureChromiumHeadlessShell,
importPlaywright,
} from "../../tools/browser/runtime-check.js";
// ---------------------------------------------------------------------------
// Print template
// ---------------------------------------------------------------------------
const FONT_STACK = `"DM Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif`;
function wrapInPrintTemplate(innerHtml: string): string {
return `
${innerHtml}
`;
}
// ---------------------------------------------------------------------------
// Public API
// ---------------------------------------------------------------------------
/**
* Convert a markdown string to a PDF buffer.
*
* Parses markdown to HTML via `marked`, wraps it in a print-friendly
* template, then renders to PDF using Playwright headless Chromium.
* The browser is always closed in a `finally` block.
*/
export async function renderMarkdownToPDF(
title: string,
markdown: string,
): Promise {
const innerHtml = marked.parse(markdown, {
gfm: true,
breaks: true,
}) as string;
const fullHtml = wrapInPrintTemplate(innerHtml);
const pw = await importPlaywright();
await ensureChromiumHeadlessShell(pw);
const browser = await pw.chromium.launch({ headless: true });
try {
const context = await browser.newContext({
javaScriptEnabled: false,
});
const page = await context.newPage();
await page.route("**/*", (route) => route.abort());
await page.setContent(fullHtml, { waitUntil: "domcontentloaded" });
const pdfBuffer = await page.pdf({
format: "A4",
margin: {
top: "0.75in",
bottom: "0.75in",
left: "0.75in",
right: "0.75in",
},
printBackground: true,
});
return Buffer.from(pdfBuffer);
} finally {
await browser.close();
}
}