Lasm brings formally verified Lean apps to JS and WebAssembly runtimes

hargup13 · x · 2026-10-29

Developer lastmjs released Lasm, described as "Lean for JavaScript and WebAssembly runtimes," enabling formally verified Lean apps to run on Node.js servers, serverless and edge platforms, and in the browser.

The author claims formal verification is "now possible everywhere that JS and Wasm run," and shared the GitHub repo — an attempt to push Lean from a research tool into mainstream web runtimes.

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