@psalomo/wasm-music-faust

The Faust compiler — the Rust implementation, faust-rs — built for wasm32-unknown-unknown with the AssemblyScript backend enabled and the Faust standard libraries embedded.

This package ships one artifact, faust-compiler-module.wasm, and no JavaScript. It is the compiler module loaded by WebAssembly Music to turn .dsp sources into AssemblyScript.

Using it

The module is a plain wasm32 module: no emscripten loader, no MEMFS, no imports.

const bytes = await (await fetch(
  'https://cdn.jsdelivr.net/npm/@psalomo/[email protected]/faust-compiler-module.wasm'
)).arrayBuffer();
const { instance } = await WebAssembly.instantiate(bytes, {});

Compilation goes through faust_wasm_generate_aux_files_json(name, source, args), with strings written into memory via faust_wasm_alloc. Failures carry a structured diagnostics-v2 report on the result handle (faust_wasm_text_result_diagnostics_ptr/_len). See faust-rs-transpile.js for a complete working host, and the faust-rs error model for the diagnostics schema.

Because import("stdfaust.lib") resolves from libraries embedded at build time, no library files need to be provided at runtime. Sibling sources travel inline as --virtual-source <path>=<base64> arguments.

This build

| | | |---|---| | compiler module | faust-rs-wasm-ffi/0.5.0 | | faust-rs commit | 03abb1d6090f9b50f337f67f28bf492ab90a858e | | faustlibraries commit | ac43216dda778d9cd60624ad1f6a918e112ea861 |

Built and published by this workflow, which validates every module before release.

License

The compiler is GRAME's work, not this project's:

faust-rs — a Rust port of the FAUST compiler Copyright (C) 2026 GRAME, Centre National de Creation Musicale Derived from the FAUST compiler, Copyright (C) 2003-2024 GRAME.

Licensed under LGPL-2.1-or-later; the full text is in LICENSE, copied from the faust-rs revision this module was built from. This package only repackages that build for npm.