Description
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So Claude Code's source code has been leaked. A person by the name of Chaofan Shou found that Claude Code's npm package included a source map file. Which is a JSON file that, well, quite literally contains all of the original source code embedded inside it.
Sources
Chaofan Shou's original post: https://x.com/Fried_rice/status/2038894956459290963
Kuber Mehta writeup: https://kuber.studio/blog/AI/Claude-Code's-Entire-Source-Code-Got-Leaked-via-a-Sourcemap-in-npm,-Let's-Talk-About-it
Rust/Python rewrite (claw-code): https://github.com/instructkr/claw-code
VentureBeat analysis: https://venturebeat.com/technology/claude-codes-source-code-appears-to-have-leaked-heres-what-we-know
Fortune coverage (source leak): https://fortune.com/2026/03/31/anthropic-source-code-claude-code-data-leak-second-security-lapse-days-after-accidentally-revealing-mythos/
Fortune coverage (CMS leak): https://fortune.com/2026/03/26/anthropic-leaked-unreleased-model-exclusive-event-security-issues-cybersecurity-unsecured-data-store/
The Register (with Anthropic statement): https://www.theregister.com/2026/03/31/anthropic_claude_code_source_code/
Alex Kim's technical breakdown: https://alex000kim.com/posts/2026-03-31-claude-code-source-leak/
Rohan's code quality analysis: https://x.com/rohan_2502/status/2038927786228998194
Bun bug discussion: https://github.com/oven-sh/bun/issues/28001
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