Anthropic accidentally exposes Claude Code's 512,000-line TypeScript codebase after debug file leaks to npm registry

A 59.8 MB JavaScript source map file was inadvertently included in Claude Code package version 2.1.88 on the public npm registry

Intern Chaofan Shou discovered and publicly disclosed the leak on X at 4:23 am ET, triggering rapid distribution across GitHub

The leaked codebase spans approximately 512,000 lines of TypeScript and was analyzed by thousands of developers within hours

The incident represents a significant intellectual property loss for Anthropic, valued at $19 billion annualized revenue run-rate as of March 2026