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BUN_MIGRATION.md2.25 kB
# Migrating to Bun ## Why Bun for MCP? 1. **4x Faster Startup** - Critical for MCP servers that start with each Claude conversation 2. **No Build Step** - Run TypeScript directly 3. **Simpler Toolchain** - No need for tsx, rimraf, or typescript compiler 4. **Better Performance** - Faster HTTP requests and JSON parsing ## Migration Steps ### 1. Install Bun Windows (PowerShell as Admin): ```powershell irm bun.sh/install.ps1 | iex ``` Or via Scoop: ```bash scoop install bun ``` ### 2. Replace package.json ```bash # Backup existing copy package.json package.node.json # Use Bun version copy package.bun.json package.json ``` ### 3. Install Dependencies with Bun ```bash # Remove node_modules rmdir /s /q node_modules # Install with Bun bun install ``` ### 4. Update Claude Desktop Config Edit `%APPDATA%\Claude\claude_desktop_config.json`: ```json { "mcpServers": { "mindbody": { "command": "bun", "args": ["run", "C:\\Users\\VinSpo\\Desktop\\MindbodyMCP\\src\\index.ts"], "env": { "MINDBODY_API_KEY": "your_api_key", "MINDBODY_SITE_ID": "-99", "MINDBODY_SOURCE_NAME": "your_source_name", "MINDBODY_SOURCE_PASSWORD": "your_source_password" } } } } ``` ### 5. Test with Bun ```bash # Test the tool bun run test:tool # Run the server bun run dev ``` ## Benefits You'll Notice 1. **Instant Startup** - No TypeScript compilation delay 2. **Faster Development** - Hot reload without build step 3. **Smaller Footprint** - Bun binary handles everything 4. **Better Errors** - Native TypeScript error messages ## Rollback (if needed) ```bash # Restore Node.js setup copy package.node.json package.json npm install npm run build ``` Then update Claude config back to use `node` with `dist/index.js`. ## Compatibility Notes ✅ **Confirmed Working:** - @modelcontextprotocol/sdk - axios - dotenv - All our current code ⚠️ **Watch for:** - Native Node.js modules (we don't use any) - Complex build tools (we don't need them) ## Performance Comparison | Operation | Node.js | Bun | |-----------|---------|-----| | Startup | ~800ms | ~200ms | | First API Call | ~1200ms | ~400ms | | Package Install | ~15s | ~3s | | TypeScript Run | Needs build | Direct |

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