Notes from Reading Claude Code's Leaked Source

A Turkish version of this post was originally published on blog.arasmehmet.com . Disclaimer: All source code referenced is property of Anthropic. This analysis is based on the publicly shipped npm package artifact. No proprietary code has been redistributed. March 31, 2026. Anthropic's npm package @anthropic-ai/claude-code went out with a 57MB source map file inside it. It was built with sourcesContent: true , which meant the whole TypeScript source ended up embedded in the .map . 1,902 files. O