lasm

What is lasm?

Lasm compiles Lean 4 programs ahead of time into WebAssembly modules that run on JavaScript environments like Node.js, Bun, and Deno. It allows developers to write functional code in Lean and deploy it as servers, edge functions, or browser applications.

The tool includes Lean 4 and Lake build tools directly through npm, so users do not need external installation managers. It supports multiple deployment targets including standard Node scripts, AWS Lambda packages, and WASI modules. Developers can also import JavaScript packages directly into Lean code using simple annotations.

Because it uses Lean, the compiled output supports formal verification and theorem proving. The project provides built-in libraries for HTTP requests, browser UI updates, remote procedure calls, and key-value storage. All templates and example code are released under the MIT license.

lasm features

• Compiles Lean 4 programs to WebAssembly ahead of time
• Runs on Node.js, Bun, and Deno runtimes
• Supports AWS Lambda, edge functions, and browser targets
• Includes Lean 4 and Lake build tools via npm
• Enables formal verification and theorem proving
• Provides HTTP, RPC, and DOM manipulation libraries
• Allows direct JavaScript imports with simple annotations

Who uses lasm and for what

• Deploying formally verified backend services to cloud platforms
• Building secure edge computing functions with mathematical proofs
• Creating browser applications with proven UI state management
• Integrating Lean-based algorithms into existing Node.js projects
• Running serverless functions with guaranteed type safety

lasm FAQ

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