The Lime1 virtual Wasm CPU is supported in LLVM 20, which is in wasi-sdk 26+. Enable it with -mcpu=lime1.

Lime1 is a stable subset of WebAssembly, meant for users that want a fixed feature set to target that's more up to date than "MVP".

github.com/WebAssembly/...

Building Native Plugin Systems with WebAssembly Components | Sy Brand Sandboxed plugins with well-defined interfaces

I wrote a blog post on WebAssembly Components!

New in LLVM 20.1.0, the #Wasm backend now supports the new stable Lime1 virtual CPU. Enable it with the -mcpu=lime1 flag!

Lime1 is a stable target that won't add features over time. Read more at:

github.com/WebAssembly/...

GitHub - bytecodealliance/jco: JavaScript toolchain for working with WebAssembly Components JavaScript toolchain for working with WebAssembly Components - bytecodealliance/jco

Fortunately, there is activity. Similar to ESM integration, the first steps are to build a polyfill, and that's happening:

github.com/bytecodealli...

And to build up supporting infrastructure, and that's happening too, for example:

github.com/tc39/proposa...