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@quickwinlabs/mupdf-wasm

v1.28.0

Published

MuPDF compiled to WebAssembly for QuickWin's WAMR runtime (JS longjmp, no wasm exceptions)

Vulnerabilities

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Links

Git

Maintainers

xnaxna

Keywords

mupdfpdfwebassemblywasmquickwinwamr

Readme

@quickwinlabs/mupdf-wasm

MuPDF compiled to WebAssembly, tailored for QuickWin's WAMR runtime. This is not the stock upstream mupdf npm package (which targets browsers/Node): WAMR cannot execute the wasm exception instructions that upstream's emscripten build enables, so this build swaps them out for emscripten's JS-based longjmp and keeps the module unminified for debuggability.

Build provenance

| input | value | | --- | --- | | mupdf commit | 05c6564035d20e3ed1998ffa392c9d17b2cd6a45 (1.28 development line) | | emsdk | 4.0.8 | | patch | patches/wamr-compat.patch |

The patch removes -fwasm-exceptions and switches -sSUPPORT_LONGJMP=wasm to =1, and skips terser. See build.sh to reproduce the artifacts from source (auditors: run it and diff against the committed files).

Runtime requirements (QuickWin side)

The wasm module expects the WAMR host to be built/configured with:

  • WAMR_BUILD_EXCE_HANDLING=1 (exception handling reconstruction)
  • import-global linking support
  • an app heap of ~40KB (heap_size=40960 in src/quickjs-wamr.c)

These are already in place in QuickWin; consuming this package outside QuickWin requires a comparable host setup.

Files

  • mupdf.js — ES module wrapper (JS API: Document, Page, Pixmap, …)
  • mupdf-wasm.js / mupdf-wasm.wasm — emscripten glue + wasm binary
  • mupdf.d.ts / mupdf-wasm.d.ts — TypeScript definitions

Versioning & publishing

The version follows the upstream mupdf development line this build was taken from (1.28.0 = 1.28 line snapshot at the pinned commit). Publishing is automatic: bump version in package.json and push to main — CI compares against the registry and publishes when it is new.

License

AGPL-3.0-or-later (see LICENSE); MuPDF is dual-licensed by Artifex — commercial licensing available from https://mupdf.com.