Roblox Luau Language Server

A high-performance VS Code extension for Roblox and Luau development with full API support, intelligent completions, and live game integration.

Features

Language Support

• Full Roblox API - Completions and type checking for all Roblox classes, methods, and properties
• Luau Type System - Support for type annotations, generics, and strict mode
• Smart Completions - Context-aware suggestions for services, instances, and methods
• Hover Documentation - Inline documentation for all Roblox APIs and built-in functions
• Signature Help - Parameter hints while typing function calls
• Go to Definition - Navigate to module and function definitions
• Find References - Find all usages of variables and functions
• Rename Symbol - Safely rename variables across files
• Document Symbols - Outline view of functions and variables
• Semantic Highlighting - Enhanced syntax coloring for Luau
• Code Actions - Quick fixes for undefined variables, missing requires, and type mismatches
• Code Formatting - Built-in formatter for Luau files

Live Game Integration

• Game Tree Explorer - Browse the live game hierarchy in VS Code
• Properties Panel - View and edit instance properties in real-time
• Execute Code - Run Luau code directly in the game (Ctrl+Shift+E)
• Bundle & Execute - Bundle multi-file projects and execute in-game (Ctrl+Alt+E)
• Remote Spy - Monitor RemoteEvent/RemoteFunction calls with copyable Lua code
• Teleport - Teleport your character to any instance
• Drag & Drop - Reparent instances by dragging in the tree

AI Integration

• MCP Server - Model Context Protocol server for AI assistants (Claude, etc.)
• Copilot Tools - 16 language model tools for GitHub Copilot — game tree, properties, execution, script decompilation, remote spy, and more
• MCP Resources - Expose game tree, bridge status, and console output as MCP resources

Diagnostics

• Type Errors - Catch type mismatches before runtime
• Undefined Variables - Detect typos and missing requires
• Deprecation Warnings - Know when you're using deprecated APIs
• Ignore Directives - Suppress diagnostics with @rbxls-ignore, @rbxls-disable/@rbxls-enable

Requirements

• VS Code 1.75.0 or higher
• For live game features: A compatible Roblox executor with WebSocket support

Extension Settings

• rbxdev-ls.typeCheckMode: Type checking strictness (strict, nonstrict, nocheck)
• rbxdev-ls.enableSuncApi: Enable Sunc executor API support
• rbxdev-ls.executorBridge.port: WebSocket port for executor connections (default: 21324)
• rbxdev-ls.bundler.path: Custom path to the luau-bundle executable

Keybindings

Game Tree Context Menu

Right-click any item in the Game Tree for options:

• Copy Instance Path - Copy the full path (e.g., game.Workspace.Model)
• Insert Path at Cursor - Insert the path into your code
• Insert GetService - Insert a GetService statement (for services)
• Teleport To - Teleport your character to the instance
• Delete Instance - Remove the instance from the game

Getting Started

1. Install the extension
2. Open a folder containing .lua or .luau files
3. Start coding with full Roblox API support

Live Game Setup

To enable live game features (Game Tree, Properties, Execute Code), add this script to your executor's auto-execute folder:

loadstring(game:HttpGetAsync'https://raw.githubusercontent.com/0neShot101/rbxdev-ls/main/scripts/executor-bridge.lua')()

This will automatically connect to VS Code when you join a game. The status bar will show "Roblox: Connected" when the bridge is active.

Custom Configuration

You can pass a config table to customize the bridge:

loadstring(game:HttpGetAsync'https://raw.githubusercontent.com/0neShot101/rbxdev-ls/main/scripts/executor-bridge.lua')({
    host = 'ws://127.0.0.1:21324';  -- WebSocket host
    reconnectDelay = 5;              -- Seconds between reconnect attempts
    firstConnectDepth = 999;         -- Full tree dump on first connect (for completions)
    updateTreeDepth = 2;             -- Shallow updates after (for performance)
    expandedTreeDepth = 2;           -- Depth when expanding nodes in tree view
})

The default behavior sends a full tree dump on first connect for autocomplete, then uses shallow updates for performance.

License

MIT License - see LICENSE for details.