songwalker-js

SongWalker music programming library for the browser. Provides audio playback and preset loading via WebAssembly.

Installation

npm install songwalker-js

Usage

Basic Playback

import { SongPlayer, initWasm } from 'songwalker-js';

// Initialize WASM (required before playback)
await initWasm();

// Create player and play a song
const player = new SongPlayer();
await player.playSource(`
  track.beatsPerMinute = 120;
  track.instrument = Oscillator({ type: 'square' });
  C4 D4 E4 F4 G4
`);

Preset Loading

import { PresetLoader, initWasm } from 'songwalker-js';

await initWasm();

// Create loader pointing to a preset library
const loader = new PresetLoader('https://example.com/presets');

// Load the root index and enable a library
await loader.loadRootIndex();
await loader.enableLibrary('FluidR3_GM');

// Search for presets
const pianos = loader.search({ tags: ['piano'] });

// Load a specific preset
const preset = await loader.loadPreset('FluidR3_GM/Acoustic Grand Piano');

Monaco Editor Integration

import * as monaco from 'monaco-editor';
import { registerSongwalkerLanguage } from 'songwalker-js/monaco';

// Register the SongWalker language with Monaco
registerSongwalkerLanguage(monaco);

// Create an editor with the SongWalker language
monaco.editor.create(container, {
  language: 'songwalker',
  theme: 'songwalker-dark',
});

Exports

Main (songwalker-js)

• SongPlayer — Audio player class
• PresetLoader — Preset fetching and caching
• initWasm / initSync — WASM initialization
• compile_song — Compile .sw source to events
• render_song_samples / render_song_wav — Render to audio
• All preset types (PresetDescriptor, PresetIndex, etc.)

Monaco (songwalker-js/monaco)

• registerSongwalkerLanguage() — Register language with Monaco
• LANGUAGE_ID — Language identifier ('songwalker')
• languageConfig — Monaco language configuration
• monarchTokens — Syntax highlighting tokens
• editorTheme — Catppuccin Mocha theme
• completionItems — Auto-complete items

License

MIT