No, the only part that's Rust is the truetype font renderer, which uses ab_glyph. But even the conversion to SDFs is in Typescript. Moving data in and out of W

No, the only part that's Rust is the truetype font renderer, which uses ab_glyph. But even the conversion to SDFs is in Typescript. Moving data in and out of WASM is still kind of slow, relatively speaking (until GC lands), and Rust's ergonomics are not a good fit for the API design which has a ton of optionals. The shader linker uses a Lezer grammar rather than the official WGSL tree sitter grammar so the AST node structure is more optimized for quick unconditional consumption.