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🎼 Devalang, by Devaloop Labs

🎶 Compose music with code — simple, structured, sonic.

Devalang is a tiny domain-specific language (DSL) for music makers, sound designers, and audio hackers. Compose loops, control samples, render and play audio — all in clean, readable text.

🦊 Whether you're building a track, shaping textures, or performing live, Devalang helps you think in rhythms. It’s designed to be simple, expressive, and fast — because your ideas shouldn’t wait.

From studio sketches to live sets, Devalang gives you rhythmic control — with the elegance of code.

🚧 v0.0.1-alpha.5 Notice 🚧

NEW: Devalang VSCode extension is now available ! Get it here.

Currently, Devalang CLI is only available for Windows.
Linux and macOS binaries will be added in future releases via cross-platform builds.

📚 Quick Access

• 📖 Documentation
• 💡 Examples
• 🧩 VSCode Extension
• 🎨 Prettier Plugin
• 🌐 Project Website

🚀 Features

• 🎵 Audio Engine: Integrated audio playback and rendering
• 🧩 Module system for importing and exporting variables between files
• 📜 Structured AST generation for debugging and future compilation
• 🔢 Basic data types: strings, numbers, booleans, maps, arrays
• 👁️ Watch mode for build, check and play commands
• 📂 Project templates for quick setup

📆 Installation

For users

• ⚠️ Requires Node.js 18+

Install the package globally (NPM)

npm install -g @devaloop/devalang

Usage without install (NPX)

npx @devaloop/devalang <command>

For contributors

• ⚠️ Requires Node.js 18+
• ⚠️ Requires Rust 1.70+

> git clone https://github.com/devaloop-labs/devalang.git
> cd devalang
> npm install
> cargo install --path .

Development usage (you can customize arguments in package.json)

# For syntax checking test
npm run rust:dev:check
# For building test
npm run rust:dev:build

❔ Usage

NOTE: Commands are available via devalang or npx @devaloop/devalang.

NOTE: Arguments can be passed to commands using --<argument> syntax. You can also use a configuration file to set default values for various settings, making it easier to manage your Devalang project.

NOTE: Some commands require a mandatory --entry argument to specify the input folder, and a --output argument to specify the output folder. If not specified, they default to ./src and ./output respectively.

For more examples, see docs/COMMANDS.md

Initialize a new project

In the current directory

devalang init

Or use optional arguments to specify a directory name and a template

devalang init --name <project-name> --template <template-name>

Checking syntax only

devalang check --watch

Building output files

devalang build --watch

Playing audio files (once by file change)

devalang play --watch

Playing audio files (continuous playback, even without file changes)

devalang play --repeat

⚙️ Configuration

You can use a configuration file to set default values for various settings, making it easier to manage your Devalang project.

To do this, create a .devalang file in the root of your project directory.

See docs/CONFIG.md for more information.

📄 Syntax example

For more examples, see docs/SYNTAX.md

# index.deva

@import { globalBpm, globalBank, kickDuration } from "global.deva"

@load "./examples/samples/kick-808.wav" as customKick

bpm globalBpm
# Will declare the tempo at the globalBpm variable beats per minute

bank globalBank
# Will declare a custom instrument bank using the globalBank variable

# Loops

loop 5:
    .customKick kickDuration {reverb=50, drive=25}
    # Will play 5 times a custom sample for 500ms with reverb and overdrive effects

# Groups

group myGroup:
    .customKick kickDuration {reverb=50, drive=25}
    # Will play the same sample in a group, allowing for more complex patterns

# Will be executed line by line (sequentially)
call myGroup

# Will be executed in parallel (concurrently)
# spawn myGroup

# variables.deva

let globalBpm = 120
let globalBank = 808
let kickDuration = 500

@export { globalBpm, globalBank, kickDuration }

🧯 Known issues

• No support yet for if, else, else if, pattern, function, ... statements
• No support yet for cross-platform builds (Linux, macOS)

🧪 Roadmap Highlights

For more info, see docs/ROADMAP.md

• ⏳ Other statements (e.g if, function, ...)
• ⏳ Cross-platform support (Linux, macOS)
• ⏳ More built-in instruments (e.g. snare, hi-hat, etc.)

🛡️ License

MIT — see LICENSE

🤝 Contributing

Contributions, bug reports and suggestions are welcome !
Feel free to open an issue or submit a pull request.

📢 Contact

📧 contact@devaloop.com