Inside Claude Code: What 512,000 Lines of Leaked...

Originally published on NextFuture On March 31, 2026, Anthropic accidentally published a 59.8 MB source map file inside their @anthropic-ai/claude-code npm package (v2.1.88). That source map pointed to a publicly accessible .zip archive on Cloudflare R2 containing roughly 1,900 TypeScript files and over 512,000 lines of code. Within hours, the entire codebase was mirrored across GitHub. Anthropic issued takedown notices, but the cat was out of the bag. This isn't a story about the leak itself —