Claude Code (Unofficial Source Extraction)

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This is NOT an official Anthropic repository.

This repository contains the extracted TypeScript source code of Anthropic's Claude Code 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
• Official homepage: github.com/anthropics/claude-code

How It Leaked

The source code leak was discovered by Chaofan Shou (@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, 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?

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.

How to get it yourself

Clone this repository

git clone git@github.com:chatgptprojects/claude-code.git
cd claude-code

Or extract it yourself from npm

1. Install the package:

mkdir claude-code-extract && cd claude-code-extract
npm pack @anthropic-ai/claude-code@2.1.88
tar -xzf anthropic-ai-claude-code-2.1.88.tgz
cd package

2. Run the unpack script:

Create a file called unpack.mjs:

import { readFileSync, writeFileSync, mkdirSync } from "fs";
import { dirname, join } from "path";

const mapFile = join(import.meta.dirname, "cli.js.map");
const outDir = join(import.meta.dirname, "unpacked");

console.log("Reading source map...");
const map = JSON.parse(readFileSync(mapFile, "utf-8"));

const sources = map.sources || [];
const contents = map.sourcesContent || [];

console.log(`Found ${sources.length} source files.`);

let written = 0;
let skipped = 0;

for (let i = 0; i < sources.length; i++) {
  const src = sources[i];
  const content = contents[i];

  if (content == null) {
    skipped++;
    continue;
  }

  const outPath = join(outDir, src.replace(/^\.\.\//g, ""));
  mkdirSync(dirname(outPath), { recursive: true });
  writeFileSync(outPath, content);
  written++;
}

console.log(`Done! Wrote ${written} files to ${outDir}`);
if (skipped > 0) console.log(`Skipped ${skipped} files with no content.`);

3. Run it:

node unpack.mjs

The extracted source will be in the unpacked/ directory.

Project Structure

src/
├── cli/           # CLI entrypoint and argument parsing
├── commands/      # Command implementations
├── components/    # UI components (Ink/React)
├── constants/     # App constants and configuration
├── context/       # Context management
├── hooks/         # React hooks
├── ink/           # Terminal UI (Ink framework)
├── services/      # Core services
├── skills/        # Skill definitions
├── tools/         # Tool implementations (file editing, search, etc.)
├── types/         # TypeScript type definitions
├── utils/         # Utility functions
├── main.tsx       # Main application entry
├── query.ts       # Query handling
└── ...

Disclaimer

All code in this repository is the intellectual property of Anthropic. This repository is provided for educational and reference purposes only. Please refer to Anthropic's license terms for usage restrictions.

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This is not affiliated with, endorsed by, or supported by Anthropic.