Simon Willison’s Weblog

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9th March 2026

Research Luau WebAssembly: Browser Playground + Python wasmtime — Luau WebAssembly explores compiling the Luau scripting language (used by Roblox) to WebAssembly for interactive browser environments and Python integration via wasmtime. By leveraging Emscripten, the project creates a streamlined WASM module that runs in the browser (with a playground and Pyodide integration) and server-side Python. Key technical adaptations include custom output capture, flexible WASM imports for wasmtime, and Python wrappers that handle C++ exception lifecycles.

This is a beat by Simon Willison, posted on 9th March 2026.

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