Claude Code 2.1.88 Source Recovery

Skill by ara.so — Daily 2026 Skills collection.

This project contains the recovered TypeScript source code of @anthropic-ai/claude-code version 2.1.88, extracted from the accidentally published cli.js.map source map file (57MB). The restored codebase is ~700,000 lines of TypeScript organized into a clean directory structure.

How the Source Was Recovered

The cli.js.map file contained a sourcesContent field with all original source files. The recovery process:

// Conceptual recovery process
import * as fs from 'fs';

const sourceMap = JSON.parse(fs.readFileSync('cli.js.map', 'utf-8'));

// sourceMap.sources = array of original file paths
// sourceMap.sourcesContent = array of original file contents

sourceMap.sources.forEach((filePath: string, index: number) => {
  const content = sourceMap.sourcesContent[index];
  if (content) {
    fs.mkdirSync(path.dirname(filePath), { recursive: true });
    fs.writeFileSync(filePath, content);
  }
});

Installing the Original Package (Mirror)

Since v2.1.88 was pulled from npm, use the Tencent mirror cache:

npm install -g https://mirrors.cloud.tencent.com/npm/@anthropic-ai/claude-code/-/claude-code-2.1.88.tgz

Project Structure

src/
├── entrypoints/        # CLI entry points and initialization
│   ├── cli.ts          # Main CLI bootstrap
│   └── index.ts        # Module exports
├── commands/           # Command system
│   ├── login.ts        # Authentication command
│   ├── mcp.ts          # MCP protocol command
│   ├── review.ts       # Code review command
│   └── tasks.ts        # Task management command
├── components/         # React + Ink terminal UI components
│   ├── Chat.tsx        # Main chat interface
│   ├── Message.tsx     # Message rendering
│   └── Prompt.tsx      # Input prompt component
├── services/           # Core business logic
│   ├── policy.ts       # Policy/permission management
│   ├── sync.ts         # State synchronization
│   └── remote.ts       # Remote capability handling
├── hooks/              # React hooks for terminal state
│   ├── useInput.ts     # Input handling hook
│   └── useSession.ts   # Session state hook
├── utils/              # Utility functions
│   ├── auth.ts         # Authentication utilities
│   ├── file.ts         # File operations
│   └── process.ts      # Process management
└── ink/                # Custom terminal rendering infrastructure

Key Architecture Patterns

Command System

Claude Code uses a hybrid command loading mechanism:

// Pattern: Command registration
interface Command {
  name: string;
  description: string;
  aliases?: string[];
  handler: (args: string[], context: CommandContext) => Promise<void>;
}

// Built-in commands are registered at startup
const builtinCommands: Command[] = [
  {
    name: 'login',
    description: 'Authenticate with Anthropic',
    handler: async (args, ctx) => {
      // OAuth flow or API key setup
      const apiKey = process.env.ANTHROPIC_API_KEY;
      await ctx.auth.initialize(apiKey);
    }
  },
  {
    name: 'mcp',
    description: 'Manage MCP servers',
    aliases: ['mcp-server'],
    handler: async (args, ctx) => {
      await ctx.mcp.handleCommand(args);
    }
  }
];

Terminal UI with React + Ink

import React, { useState, useEffect } from 'react';
import { Box, Text, useInput, useApp } from 'ink';

// Pattern: Ink component for terminal rendering
const ChatInterface: React.FC<{ session: Session }> = ({ session }) => {
  const [messages, setMessages] = useState<Message[]>([]);
  const [inputValue, setInputValue] = useState('');
  const { exit } = useApp();

  useInput((input, key) => {
    if (key.escape) {
      exit();
    }
    if (key.return) {
      handleSubmit(inputValue);
      setInputValue('');
    } else {
      setInputValue(prev => prev + input);
    }
  });

  return (
    <Box flexDirection="column">
      {messages.map((msg, i) => (
        <Box key={i} marginBottom={1}>
          <Text color={msg.role === 'assistant' ? 'cyan' : 'white'}>
            {msg.content}
          </Text>
        </Box>
      ))}
      <Box>
        <Text color="green">{'> '}</Text>
        <Text>{inputValue}</Text>
      </Box>
    </Box>
  );
};

MCP (Model Context Protocol) Integration

// Pattern: MCP server connection
interface MCPServerConfig {
  name: string;
  command: string;
  args?: string[];
  env?: Record<string, string>;
}

class MCPClient {
  private servers: Map<string, MCPServer> = new Map();

  async connectServer(config: MCPServerConfig): Promise<void> {
    const server = new MCPServer({
      command: config.command,
      args: config.args ?? [],
      env: {
        ...process.env,
        ...config.env
      }
    });

    await server.initialize();
    this.servers.set(config.name, server);
  }

  async listTools(serverName: string): Promise<Tool[]> {
    const server = this.servers.get(serverName);
    if (!server) throw new Error(`Server ${serverName} not connected`);
    return server.listTools();
  }

  async callTool(serverName: string, toolName: string, params: unknown): Promise<ToolResult> {
    const server = this.servers.get(serverName);
    if (!server) throw new Error(`Server ${serverName} not connected`);
    return server.callTool(toolName, params);
  }
}

Authentication Pattern

// Pattern: API key management
class AuthService {
  private apiKey: string | null = null;

  async initialize(key?: string): Promise<void> {
    // Priority: explicit key > env var > stored config
    this.apiKey = key
      ?? process.env.ANTHROPIC_API_KEY
      ?? await this.loadStoredKey();

    if (!this.apiKey) {
      throw new Error('No API key found. Set ANTHROPIC_API_KEY or run: claude login');
    }
  }

  private async loadStoredKey(): Promise<string | null> {
    const configPath = path.join(os.homedir(), '.claude', 'config.json');
    try {
      const config = JSON.parse(fs.readFileSync(configPath, 'utf-8'));
      return config.apiKey ?? null;
    } catch {
      return null;
    }
  }

  getHeaders(): Record<string, string> {
    return {
      'x-api-key': this.apiKey!,
      'anthropic-version': '2023-06-01',
      'content-type': 'application/json'
    };
  }
}

Feature Flags Pattern

// Pattern: Build-time feature flags (seen throughout source)
const FEATURES = {
  REMOTE_CAPABILITY: process.env.CLAUDE_FEATURE_REMOTE === 'true',
  MCP_ENABLED: process.env.CLAUDE_MCP_ENABLED !== 'false',
  TASKS_ENABLED: process.env.CLAUDE_TASKS_ENABLED === 'true',
  DEBUG_MODE: process.env.CLAUDE_DEBUG === 'true',
} as const;

function withFeatureFlag<T>(
  flag: keyof typeof FEATURES,
  handler: () => T,
  fallback: T
): T {
  return FEATURES[flag] ? handler() : fallback;
}

Session and State Management

// Pattern: Session hook
function useSession() {
  const [session, setSession] = useState<Session | null>(null);
  const [isLoading, setIsLoading] = useState(false);
  const [error, setError] = useState<Error | null>(null);

  const startSession = async (config: SessionConfig) => {
    setIsLoading(true);
    try {
      const newSession = await Session.create({
        apiKey: process.env.ANTHROPIC_API_KEY!,
        model: config.model ?? 'claude-opus-4-5',
        systemPrompt: config.systemPrompt,
        tools: config.tools ?? []
      });
      setSession(newSession);
    } catch (err) {
      setError(err instanceof Error ? err : new Error(String(err)));
    } finally {
      setIsLoading(false);
    }
  };

  return { session, isLoading, error, startSession };
}

Exploring the Source

# Clone the recovery repository
git clone https://github.com/ponponon/claude_code_src.git
cd claude_code_src

# Count total lines
find src/ -name "*.ts" -o -name "*.tsx" | xargs wc -l | tail -1

# Find all command handlers
grep -r "handler:" src/commands/ --include="*.ts" -l

# Explore MCP implementation
find src/ -name "*mcp*" -type f

# Search for Ink component usage
grep -r "from 'ink'" src/ --include="*.tsx" -l

# Find all feature flag checks
grep -r "FEATURES\." src/ --include="*.ts" -l

Key Dependencies (Inferred from Source)

{
  "dependencies": {
    "@anthropic-ai/sdk": "^0.x.x",
    "ink": "^4.x.x",
    "react": "^18.x.x",
    "@modelcontextprotocol/sdk": "^1.x.x",
    "commander": "^11.x.x",
    "chalk": "^5.x.x",
    "zod": "^3.x.x"
  },
  "devDependencies": {
    "typescript": "^5.x.x",
    "bun": "^1.x.x",
    "@types/react": "^18.x.x"
  }
}

Reconstructing to Run

# 1. Initialize package
npm init -y

# 2. Install inferred dependencies
npm install @anthropic-ai/sdk ink react @modelcontextprotocol/sdk commander chalk zod
npm install -D typescript @types/react @types/node bun-types

# 3. Create tsconfig.json
cat > tsconfig.json << 'EOF'
{
  "compilerOptions": {
    "target": "ES2022",
    "module": "ESNext",
    "moduleResolution": "bundler",
    "jsx": "react",
    "strict": true,
    "outDir": "dist",
    "rootDir": "src"
  },
  "include": ["src/**/*"]
}
EOF

# 4. Set environment variables
export ANTHROPIC_API_KEY="your-key-from-env"

# 5. Attempt build (note: bun:bundle macros may need replacement)
bun build src/entrypoints/cli.ts --outfile dist/cli.js

Common Research Tasks

# Find how tools are registered
grep -r "registerTool\|addTool\|tools\.push" src/ --include="*.ts"

# Understand streaming implementation
grep -r "stream\|EventSource\|ReadableStream" src/ --include="*.ts" -l

# Find retry/error handling logic
grep -r "retry\|exponentialBackoff\|withRetry" src/ --include="*.ts"

# Locate permission/policy checks
grep -r "hasPermission\|checkPolicy\|canExecute" src/ --include="*.ts"

# Find all slash commands
grep -r "\/[a-z]" src/commands/ --include="*.ts"

Troubleshooting

bun:bundle macro errors: These are Bun-specific build macros. Replace with runtime equivalents or stub them:

// Replace: import { version } from 'bun:bundle';
const version = process.env.npm_package_version ?? '2.1.88';

Missing type declarations: Some internal types may reference Anthropic-internal packages. Create stub declaration files:

// types/stubs.d.ts
declare module '@anthropic-ai/internal-utils' {
  export function someUtil(): void;
}

React/Ink version conflicts: Pin to exact versions used circa early 2026:

npm install ink@4.4.1 react@18.3.1

Legal Notice

This repository contains source code recovered via source map. All intellectual property rights belong to Anthropic. This is for research and educational purposes only. Do not use for commercial purposes without proper licensing.