What's the advantage of defining the grammar in Rust? JavaScript is admittedly an odd choice, but it works, there are a ton of grammars out there and it isn't needed at runtime.
Changing the runtime to Rust is very useful though - I've wanted that for a long time to make WASM and cross compilation easier.
The ability to define the grammar via high quality Rust bindings is pretty inspired imo. It gets you waaaay better bindings than the homogenous Node type that tree-sitter provides you.
Changing the runtime to Rust is very useful though - I've wanted that for a long time to make WASM and cross compilation easier.