Skimming the download, this does indeed use wasm, but it's also possible to build to pure JS with emscripten (in WASM=0 mode, wasm2js compiles the wasm to JS).

Skimming the download, this does indeed use wasm, but it's also possible to build to pure JS with emscripten (in WASM=0 mode, wasm2js compiles the wasm to JS). Perhaps that's what they used to do and the docs have not been updated or something like that.