mp-tikz-wasm 0.2.1

Three fixes: two to the TikZ path, one to the LuaTeX engine (luatex.wasm is rebuilt with one source patch; MetaPost, pdfTeX and dvisvgm are unchanged).

• LuaTeX in DVI mode can ship rules. Every \hrule, \vrule, leader and, in maths, \sqrt, \over, \overline and \underline under engine: 'luatex' or 'lualatex' threw "null function or function signature mismatch". LuaTeX's back-end dispatch table is an unprototyped function pointer; the ship-out calls its rule slot with four arguments and the DVI implementation took three, which native C tolerates and WebAssembly's call_indirect does not. A four-argument wrapper fills the slot (patches/luatex/0001). Two new golden cases compare every rule construct byte for byte with TeX Live's dviluatex and dvilualatex.
• Wrapped TikZ figures keep their border. The SVG of a body the tags (or renderFigure) wrap in standalone is now the standalone page, border included (--bbox=papersize), where it used to be dvisvgm's tight box. TikZ leaves its classic arrow tips (>=latex, stealth, the primed forms) out of the picture's bounding box, so without the border a -> on a horizontal line rendered as a line with no head. Complete documents are unaffected. The IndexedDB result cache is versioned up so old crops are re-rendered.
• spath3 is bundled, so \usetikzlibrary{calligraphy} (and knots) works: the library is part of spath3, which pgf does not ship.

245 tests, both golden corpora byte-identical to TeX Live 2025 (10 TikZ/LaTeX cases, 15 MetaPost).

mp-tikz-wasm 0.2.0

Two features since 0.1.0, each available in the browser and from Node.

Saved figures

A page can carry its diagrams as static files, so a first visit never starts the engines.

• npx mpost-wasm --prerender page.html typesets every diagram tag on the page in Node and writes figures/figure-HASH.svg next to it, HASH being six characters of the hash of the element's source and attributes. Files that exist are kept; --force re-renders them; --dry-run lists.
• In the browser, mpTikzWasm.saveFigures() writes the same files into a folder you pick (Chrome, Edge) or downloads them as a zip; mpTikzWasm.figures() lists them.
• With data-figures="figures/" on the loader script, each element loads its file if it exists and the engines start only for the figures that are missing. A page whose figures are all saved loads no wasm at all. The demo tags page is served this way.
• Each saved SVG carries its fonts and namespaced ids, so it also works as a plain image anywhere.

Levelled logging

• MetaPost.create({ logLevel }) takes silent, error, warn (the default), info, debug or trace; mp.logLevel = … changes it at any time; logger: replaces the console sink; mp.on('record', …) sees every record.
• MetaPost's terminal is now streamed line by line as it is written (mp.on('log')), not replayed after the run.
• CLI: -v, -vv, -vvv, -q, --log-level=. Tags: data-log="debug" and mpTikzWasm.setLogLevel(). Playground: a log selector.

Also

• The IndexedDB result cache is keyed by the figure hash (store version 2; entries from 0.1.0 are dropped) and closes its connections after use.
• package.json exports ./auto, ./figures and ./prerender.
• mplib.wasm is rebuilt with a host hook for the terminal stream; output remains byte-identical to TeX Live 2025 on both golden corpora and the 1181-page PGF manual. 241 tests and the 48-check native contract pass.

The prebuilt archives below contain dist/ (the four engines, the library, the CLI, the bundles) and the demo pages; see the README for hosting and the API.

mp-tikz-wasm 0.1.0

First public release of mp-tikz-wasm — MetaPost and TikZ in the browser, with real LaTeX, and nothing on the server.

Four engines are compiled to WebAssembly behind one TypeScript library: MetaPost 2.11, pdfTeX 1.40 and LuaTeX 1.21 (DVI mode), and dvisvgm 3.4.3. Output is byte-identical to TeX Live 2025 on both golden corpora and on the complete 1181-page PGF/TikZ manual.

What you can do

• Render MetaPost figures to SVG, EPS and structured JSON, with btex … etex labels typeset by real TeX or LaTeX.
• Typeset whole LaTeX/TikZ documents to SVG, including pgfplots and graph drawing (via LuaTeX).
• Drop-in HTML tags (<script type="text/tikz">, <tikz-diagram>, <metapost-diagram>), a Node/browser library API, and an mpost-wasm CLI.

Quick start (no TeX Live, no Emscripten)

tar xzf mp-tikz-wasm-0.1.0.tar.gz && cd mp-tikz-wasm-0.1.0
node serve.mjs 8080        # then open http://localhost:8080/site/

Or host dist/ on any static server and add one script line — see START.md and site/guide.html. The archive contains the compiled engines, the JavaScript, the texmf bundles (fonts, formats, packages) and the demo pages.

Live demos

https://eschatolog.ist/software/mp-tikz-wasm/ (feature guide, editor, drop-in tags, real-time graphics, single-file playground).

Quality

207 unit and end-to-end tests, a 46-check native contract harness, no per-instance memory leak, and green CI (native + WebAssembly) on every push.

Licence

LGPL-3.0-or-later for the project code; the bundled TeX Live and engine components keep their own licences — see NOTICE.md.