Bun Runtime APIs

Use this skill when working with Bun's runtime environment, including file system operations, HTTP servers, environment variables, and Bun-specific APIs.

Key Concepts

Bun Globals

Bun provides several global APIs that are optimized for performance:

• Bun.file() - Fast file reading with automatic content-type detection
• Bun.write() - High-performance file writing
• Bun.serve() - Ultra-fast HTTP server
• Bun.env - Type-safe environment variables
• Bun.$ - Shell command execution with template literals

File I/O

Bun's file APIs are significantly faster than Node.js equivalents: