Jaws – a JavaScript to WASM ahead-of-time compiler
I've open sourced a JavaScript to WASM compiler. It's an experimental tool, but given the semantics I already implemented, I'm fairly certain I am able to eventually cover 100% of JavaScript spec. Any ideas, questions or critique welcomed! If you are interested in WASM, especially with new proposals like WASM GC or exception handling, it might be a good source of seeing these features in action - the project has a few thousand lines of hand written WAT so far.
In plain words
Jaws is an open-source ahead-of-time compiler that converts JavaScript code into WebAssembly. Designed for developers interested in WebAssembly and its emerging features, the experimental tool demonstrates practical implementations of proposals like WASM garbage collection and exception handling through hand-written WebAssembly code. The project is in active development with the potential to eventually support the full JavaScript specification.
written from the facts on this page · September 2026
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