Claude Code Leaked Itself. The Internet Rewrote It in Rust.

Anthropic accidentally bundled the entire Claude Code source — 512,000 lines of TypeScript across ~1,900 files — inside an npm package due to a missing .npmignore. The 59.8 MB source map was public before anyone noticed.

Within hours, developers had mirrored it, dissected it, and spun up rewrites. A Python port dropped fast; someone called it slow; a Rust rewrite followed. The clean-room Rust repo hit 50,000 GitHub stars in two hours — likely the fastest-growing repo in GitHub history — and crossed 100,000 stars before Anthropic could meaningfully respond. The knock-off now has more stars than the original.

Anthropic attempted takedowns. Some mirrors vanished. Others rebranded or shifted to clean-room reimplementations to sidestep copyright. The legal picture is murky: the code was publicly accessible, but that doesn't make redistribution clean.

Why it matters: When an AI company's flagship dev tool leaks and gets community-rebuilt in a weekend, it signals both the fragility of IP in the AI era and just how fast open-source momentum can outrun legal guardrails.