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leanmcp 2026-03-31 19:22:42 +08:00
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> **This is NOT an official Anthropic repository.** > **This is NOT an official Anthropic repository.**
This repository contains the extracted TypeScript source code of [Anthropic's Claude Code](https://www.anthropic.com/) CLI tool. The source was obtained by unpacking the source map (`cli.js.map`) bundled with the officially published npm package. This repository contains the extracted TypeScript source code of [Anthropic's Claude Code](https://www.anthropic.com/) CLI tool — Anthropic's official CLI that lets you interact with Claude directly from the terminal to perform software engineering tasks like editing files, running commands, searching codebases, managing git workflows, and more.
The source was obtained by unpacking the source map (`cli.js.map`) bundled with the officially published npm package.
- **npm package:** [@anthropic-ai/claude-code v2.1.88](https://www.npmjs.com/package/@anthropic-ai/claude-code/v/2.1.88) - **npm package:** [@anthropic-ai/claude-code v2.1.88](https://www.npmjs.com/package/@anthropic-ai/claude-code/v/2.1.88)
- **Official homepage:** [github.com/anthropics/claude-code](https://github.com/anthropics/claude-code) - **Official homepage:** [github.com/anthropics/claude-code](https://github.com/anthropics/claude-code)
## How It Leaked
The source code leak was discovered by [Chaofan Shou (@Fried_rice)](https://x.com/Fried_rice) and posted publicly on March 31, 2026:
> *"Claude code source code has been leaked via a map file in their npm registry!"*
>
> — [@Fried_rice](https://x.com/Fried_rice), March 31, 2026
The published npm package (`@anthropic-ai/claude-code`) included a source map file (`cli.js.map`) containing the full, unobfuscated TypeScript source code. The `sourcesContent` field of the source map held every original `.ts`/`.tsx` file that was bundled into `cli.js`, making the entire codebase trivially extractable.
## Why does this exist? ## Why does this exist?
Anthropic publishes Claude Code as a bundled JavaScript CLI on npm. The published package includes a source map file (`cli.js.map`) that contains the original TypeScript source. This repository simply extracts and preserves that source for easier reading and reference. Anthropic publishes Claude Code as a bundled JavaScript CLI on npm. The published package includes a source map file (`cli.js.map`) that contains the original TypeScript source. This repository simply extracts and preserves that source for easier reading and reference.