Chaofan Shou (@Fried_rice) discovered that the published npm package for Claude Code included a .map file referencing the full, unobfuscated TypeScript source — downloadable as a zip from Anthropic's R2 storage bucket.
"Claude code source code has been leaked via a map file in their npm registry!"
Claude Code is Anthropic's official CLI tool for interacting with Claude directly from the terminal — editing files, running commands, searching codebases, managing git workflows, and more. This repository contains the leaked src/ directory.
| Leaked | 2026-03-31 |
| Language | TypeScript (strict) |
| Runtime | Bun |
| Terminal UI | React + Ink |
| Scale | ~1,900 files · 512,000+ lines of code |