Upgrade the WASM engines to their latest TeX Live (2025) versions

[fabawi]

Based on the emscripten pipeline implemented by https://github.com/SwiftLaTeX/SwiftLaTeX this should theoretically be possible. However, the memory system has been changed in the latest TeX Live versions. This requires some significant changes to the swiftLaTeX API as well as the sources. Additionally, the download endpoint would have to be updated to a more recent TeX Live version.

Currently, the TeX Live endpoint has been patched to include zref-clever (which requires a LaTeX kernel released after 2021, whereas the current WASM engines were built with the 2020 version) for testing whether the new engines work without having to update the endpoint.

[mathlab08]

XeLaTeX in SwiftLaTeX uses the mechanism of Tectonic, the current version of Tectonic is 0.15, but the TeXLie used is still 2022,. some people have tried to upgrade to 2024, but there is no upgrade used at the moment. it is hoped that TeXlyre can upgrade to use TeXLive 2025.

[fabawi]

We are working on it. I think SwiftLaTeX was based on Tectonic at some point, but their latest version (and the only one I found publicly available) is based on TeXLive directly as you can see here:
https://github.com/SwiftLaTeX/SwiftLaTeX/tree/master/pdftex.wasm

notice the overlap with TeX Live's dirs here:
https://github.com/TeX-Live/texlive-source/tree/trunk/texk/web2c

Not sure if Tectonic was structured differently in the past, but now it is mostly rust-based. Also, Tectonic supports XeTeX only as far as I can tell, but the SwiftLaTeX engine supports both pdfTeX and XeTeX.

Thank you for pointing out that SwiftLaTex was based (at some point) on Tectonic. This is helpful in exploring all possible options out there

[github-actions[bot]]

Stale issue message