Publishing WASM Wheels to PyPI for Use with Pyodide
Simon Willison's Weblog5 hours agoTutorialPyodide 314.0 removes a long-standing distribution bottleneck by allowing WebAssembly-compiled Python wheels to be published directly to PyPI, so any package author can now distribute Pyodide-compatible packages without Pyodide team involvement. Previously, the team manually built and hosted over 300 packages. Simon Willison celebrated by publishing luau-wasm — a Lua-based scripting language compiled to WASM — using Codex with GPT-5.5 to automate the packaging workflow.
luau-wasm 0.1a0
Simon Willison's Weblog5 hours agoReleaseSimon Willison has published luau-wasm 0.1a0, an early alpha release that packages the Luau scripting language (Roblox's typed Lua fork) compiled to WebAssembly as a Python wheel installable in Pyodide environments. The release accompanies a companion post detailing the process of publishing WASM wheels to PyPI for browser-based Python runtimes. This enables developers to embed a Luau interpreter inside Pyodide-powered, browser-native Python applications without leaving the WebAssembly sandbox.
WASI 0.3.0 Released with Native Async for WebAssembly Components
Hacker News (AI keywords)2 days agoReleaseWASI 0.3.0 has been ratified, making async native to WebAssembly Components. The release replaces several WASI 0.2 workaround patterns with futures, streams, async functions, and simpler interfaces. Key changes touch CLI I/O, sockets, HTTP, filesystem, and clocks, mostly through mechanical but compatibility-relevant API reshaping.
micropython-wasm 0.1a2
Simon Willison's Weblog8 days agoReleaseSimon Willison released micropython-wasm 0.1a2, with the main change being a new CLI. The CLI was added from issue #7 and was inspired while drafting a related post about MicroPython in a sandbox. Its purpose is to make the post's “Try it yourself” section easier to demonstrate and follow, especially for readers experimenting with Python, WebAssembly, and sandboxing.
Running Python code in a sandbox with MicroPython and WASM
Simon Willison's Weblog8 days agoNew ToolSimon Willison describes his latest attempt to safely run Python plugin-style code inside his own applications. The alpha package micropython-wasm uses MicroPython compiled to WebAssembly, executed through the maintained wasmtime Python library. His goals include clean PyPI installation, CPU and memory limits, controlled file and network access, host functions, and reliable documentation.
datasette-agent-micropython 0.1a0
Simon Willison's Weblog11 days agoReleaseSimon Willison released datasette-agent-micropython 0.1a0, an alpha aimed at letting Datasette Agent generate and execute Python safely. The project focuses on sandboxing, with MicroPython and WebAssembly-related techniques suggested by the tags. Willison says the early results look promising and that GPT-5.5 has not yet escaped the sandbox, though this remains an early alpha.
micropython-wasm 0.1a1
Simon Willison's Weblog11 days agoReleaseSimon Willison released micropython-wasm 0.1a1, a small update connected to Python, sandboxing, and WebAssembly. The release fixes limitations that appeared while he was trying to use it to build datasette-agent-micropython. The post does not list detailed changes, so this should be read as an early usability and compatibility improvement rather than a major feature launch.
micropython-wasm 0.1a0
Simon Willison's Weblog12 days agoReleaseSimon Willison released micropython-wasm 0.1a0, an alpha package described as his latest sandboxing experiment. It bundles a lightly customized WASM build of MicroPython with a wrapper for executing code through wasmtime. The post is brief, but relevant to developers tracking Python sandboxing, WebAssembly runtimes, and controlled execution environments.
Running Python ASGI Apps in the Browser via Pyodide + a Service Worker
Simon Willison's Weblog14 days agoTutorialSimon Willison demonstrates an experiment for running Python ASGI apps entirely in the browser using Pyodide and a Service Worker. The approach addresses a Datasette Lite limitation: HTML returned through intercepted navigation did not execute script tags, breaking features and plugins. Claude Opus 4.8, used through Claude Code for web, helped explore the implementation. Basic ASGI and Datasette 1.0a31 demos are available.
使用 Next.js 與 Vercel 顛覆網頁端影片編輯體驗
Vercel Changelog816 days agoOpinionThis official Vercel blog post explores in depth how to use Next.js and the Vercel platform to revolutionize the traditional web-based video editing…