📰 Story

Publishing WASM wheels to PyPI for use with Pyodide

The Pyodide 314.0 release announcement (via Hacker News ) includes news I've been looking forward to for a long time: You can now publish Python packages built for Pyodide (or any Python runtime compatible with the PyEmscripten platform defined in PEP 783 ) directly to PyPI and install them at runtime. Previously, the Pyodide maintainers had to maintain, build, and host over 300 packages ourselves. This created a significant burden on our maintainers and became a major bottleneck for the community, as every new package required manual review. Moving forward, package maintainers can simply build and publish Pyodide wheels to PyPI, just as they do for native wheels on Linux, macOS, or Windows. Here's the PR to PyPI itself supporting this , which landed on April 21st. I adore Pyodide , and have been frustrated in the past by this limitation. It's possible to compile C or Rust extensions to WASM in a wheel file, but before now there was no easy way to distribute them. Thanks to the efforts of a whole lot of people, that's now been fixed! Trying it out with luau-wasm I decided to celebrate by finding something I could package. I have quite a few experimental Pyodide projects lying around, but the best fit for this looked to be my Luau WebAssembly research spike from 9th March. Luau is a "small, fast, and embeddable programming language based on Lua with a gradual type system", developed by Roblox and released under an MIT license. It's written in C++. I already knew it was possibl