Show HN: Lasm – Write formally verified webapps in Lean for Node/serverless/edge

Lasm is a new compiler that translates Lean 4 programs to WebAssembly, enabling developers to write formally verified web applications that can run on Node.js, serverless platforms, edge functions, and browsers from a single codebase. The project, now available on npm, includes frameworks for HTTP, UI, RPC, and other web functionality, with a demonstration RealWorld app featuring 117 proved theorems. Lasm requires only Node (or Bun/Deno) and automatically installs Lean and its build tools, making formally verified webapp development more accessible.