Claude Code uses Bun written in Rust now

kept by eddie jul 24

Claude Code has switched its underlying runtime to Bun, a JavaScript toolkit implemented in Rust, to improve performance and developer experience.

Bun 1.4 | Bun Blog
Bun 1.4 rewrites the runtime in Rust, adds built-in headless browser automation, image and markdown APIs, boosts Node.js compatibility, and reduces CPU and memory usage.
also on Bun, #rust, Claude Code, #open-source, #ai-coding, #developer-tools
The Pulse: What can we learn from Bun’s rapid Rust rewrite with AI? - The Pragmatic Engineer
Bun’s Zig-to-Rust rewrite was completed in 11 days using 64 AI agents, costing $165K, showing AI can accelerate large migrations when a solid test suite and expert oversight exist.
also on Bun, #rust, #open-source, #ai-coding, #developer-tools