Quickstart

PythonJavaScript

Installation

uv pip install quillmark

Basic Usage

from quillmark import Document, Quill, Quillmark, OutputFormat

engine = Quillmark()                       # backend registry + render dispatcher
quill = Quill.from_path("path/to/quill")   # portable, declarative config data

markdown = """~~~
$quill: my_quill
$kind: main
title: Example Document
~~~

# Hello World
"""

doc = Document.from_markdown(markdown)
result = engine.render(quill, doc, OutputFormat.PDF)

with open("output.pdf", "wb") as f:
    f.write(result.artifacts[0].bytes)

Installation

npm install @quillmark/wasm

Basic Usage

// The single root import is the canonical API: Quill/Document (re-exported
// from the internal Typst-less core build) plus the Engine render
// dispatcher. An editor that only validates uses Quill/Document and loads
// no backend: Typst loads lazily on the first render.
import { Document, Quill, Engine } from "@quillmark/wasm";

const enc = new TextEncoder();

// A Quill is portable, declarative data: no engine needed to load it.
const quill = Quill.fromTree(new Map([
  ["Quill.yaml", enc.encode("quill:\n  name: my_quill\n  backend: typst\n  version: 1.0.0\n  description: Demo\n\ntypst:\n  plate_file: plate.typ\n")],
  ["plate.typ", enc.encode("#import \"@local/quillmark-helper:0.1.0\": data\n#data.at(\"$body\")\n")],
]));

const markdown = `~~~
$quill: my_quill
$kind: main
title: Example Document
~~~

# Hello World`;

const doc = Document.fromMarkdown(markdown);

// Rendering goes through the Engine. Its methods are async: the first call
// lazily loads the Typst backend binary; the canonical quill crosses into
// backend memory internally (no manual fromTree/fromJson needed).
const engine = new Engine();
const result = await engine.render(quill, doc, { format: "pdf" });
const pdfBytes = result.artifacts[0].bytes;

Live Preview (Canvas)

For editor-style previews, paint pages directly into a <canvas> instead of round-tripping through PNG/SVG. paint is WASM-only: both the Typst and pdfform backends support it; probe with engine.supportsCanvas(quill) before mounting canvas UI, and shares the cached compile with the byte-output render path.

const session = await engine.open(quill, doc);     // compile once (async)

// Surface session-level diagnostics from compile time.
for (const w of session.warnings) console.warn(w.message);

function renderPage(canvas, page, userZoom = 1) {
  const densityScale = (window.devicePixelRatio || 1) * userZoom;
  const result = session.paint(canvas.getContext("2d"), page, {
    layoutScale: 1,
    densityScale,
  });
  canvas.style.width  = `${result.layoutWidth}px`;
  canvas.style.height = `${result.layoutHeight}px`;
}

for (let p = 0; p < session.pageCount; p++) renderPage(canvases[p], p);

session.free();                                    // when doc changes

Key contract points:

• The painter owns canvas.width / canvas.height and rewrites them on every call (so each paint is a full repaint: no clearRect needed). The consumer owns canvas.style.* and reads result.layoutWidth / layoutHeight to size the display box.
• Fold devicePixelRatio and in-app zoom into densityScale; layoutScale controls display size.
• If layoutScale * densityScale would push either dimension past 16384 px, densityScale is clamped to fit; result.clamped reports it and result.effectiveDensityScale is the density actually applied (a clamped page renders soft at the same canvas.style size).
• pageCount and pageSize(page) reflect the session's current compile: stable between edits, but re-read them after a committed update(doc), which recompiles in place and can change the page count (ChangeSet.pageCount).
• In an edit loop, repaint dirtyPages ∩ visible rather than every page:

function onEdit(editedDoc) {
  const { pageCount, dirtyPages } = session.update(editedDoc);
  for (const p of dirtyPages) if (isVisible(p)) renderPage(canvases[p], p);
}

update is transactional: if it throws, the canvas still shows the last-good compile, so keep it up and surface the diagnostics.

Full design rationale: PREVIEW.md.