wax

A compiler toolchain for Wax, a Rust-like syntax for WebAssembly. It converts between three formats, Wax (.wax), WebAssembly text (.wat), and WebAssembly binary (.wasm), and can type-check and format Wax.

This package is the wax command line tool, compiled from OCaml to WebAssembly with wasm_of_ocaml. It is a single self-contained package that runs on Node: the same package works on Linux, macOS and Windows, with no per-platform native binaries.

Requirements

Node.js with WebAssembly GC support: Node 22 or newer.

Install

npm install -g wax

Usage

wax --help                       # full CLI reference
wax input.wax -o output.wasm     # compile Wax to a Wasm binary
wax -i wat -f wax input.wat      # convert WAT to Wax (to stdout)
wax check input.wax              # type-check only
wax format -i input.wax          # reformat in place

wax reads from stdin when no input file is given, and writes to stdout when -o is omitted (binary Wasm output to a terminal is refused; use -o).

Notes

• The Unix primitives fork/exec/pipe/dup2/waitpid are not available in the WebAssembly build; the CLI does not use them.
• Built from source with npm/build.sh in the project repository.