Lang Language

A domain-specific language (DSL) for mathematical and business logic modeling with first-class support for VS Code and Zed editors.

Features

• Syntax highlighting for .lang files
• Language Server Protocol (LSP) support with diagnostics and autocompletion
• Mathematical operators: of, from, for
• Significant whitespace support (Python-style indentation)
• Type annotations and validation

Editor Support

VS Code

Install from the Visual Studio Marketplace or OpenVSX.

Zed

The Zed extension is available in zed-extension/. See zed-extension/README.md for installation instructions.

Development

Prerequisites

• Bun 1.3+
• Mise (optional but recommended)
• Nix (for Zed extension on NixOS)

Setup

# Install dependencies
bun install
# or
mise install

# Build all extensions
mise build

# Run tests
mise test

# Watch mode (VS Code extension only)
mise watch

Project Structure

lang/
├── package.json              # Monorepo root
├── vscode-extension/         # VS Code extension
├── zed-extension/            # Zed extension (Rust/WASM)
├── scripts/                  # Build and publish scripts
└── examples/                 # Example .lang files

Building

# Build everything (VS Code VSIX + Zed WASM)
mise build

# Build only VS Code
bun run build

# Build only Zed
mise build:zed

Publishing

# Publish to VS Code Marketplace + OpenVSX + sync Zed branch
mise publish

See vscode-extension/README.md for VS Code-specific details.

License

MIT © 2026 The Lang extension authors