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mapguard is a CLI security tool that scans npm packages and published JavaScript/TypeScript bundles for accidentally included source map (.map) files that reference or embed original source code. Inspired by real-world incidents like Anthropic's accidental Claude Code source leak via a map file in their npm package, mapguard analyzes local director

Claude Code original leaked source code (March 31, 2026)

Claude Code original leaked TypeScript source (2026-03-31, 51.2万行)