claude-code-source-recovery

# Claude Code 2.1.88 Source Recovery > Skill by [ara.so](https://ara.so) — Daily 2026 Skills collection. ## What This Project Is This repository contains the recovered TypeScript source code of `@anthropic-ai/claude-code` version 2.1.88. On 2026-03-31, Anthropic accidentally published a `cli.js.map` (57MB) source map to npm that contained the full `sourcesContent` of the bundled CLI. After extraction and reconstruction, the result is ~700,000 lines of TypeScript source code organized into a readable directory structure. The project is useful for: - Studying production CLI architecture patterns (Ink/React in terminal) - Understanding how MCP (Model Context Protocol) is implemented in a real CLI - Learning how Claude Code manages sessions, commands, authentication, and tool execution --- ## Repository Structure ``` src/ ├── entrypoints/ # CLI bootstrap and initialization ├── commands/ # Command definitions (login, mcp, review, tasks, etc.) ├── components/ # Ink/React terminal UI components ├── services/ # Core business logic (sync, remote capabilities, policies) ├── hooks/ # Terminal state management hooks ├── utils/ # Auth, file ops, process management helpers └── ink/ # Custom terminal rendering infrastructure ``` --- ## Installing the Original 2.1.88 Package (Tencent Mirror Cache) The official npm version was pulled. Use the Tencent mirror cache while available: ```bash npm install -g https://mirrors.cloud.tencent.com/npm/@anthropic-ai/claude-code/-/claude-code-2.1.88.tgz ``` --- ## Extracting Source from the Source Map If you have the original `cli.js.map`, you can recover sources programmatically: ```typescript import fs from "fs"; import path from "path"; import zlib from "zlib"; interface SourceMap { version: number; sources: string[]; sourcesContent: (string | null)[]; mappings: string; } async function extractSourceMap(mapPath: string, outDir: string) { const raw = fs.readFileSync(mapPath, "utf-8"); const sourceMap: SourceMap = JSON.parse(raw); for (let i = 0; i < sourceMap.sources.length; i++) { const sourcePath = sourceMap.sources[i]; const content = sourceMap.sourcesContent[i]; if (!content) continue; // Normalize path: strip webpack/bundle prefixes const normalized = sourcePath .replace(/^webpack:\/\/\//, "") .replace(/^\.\//, ""); const outPath = path.join(outDir, normalized); fs.mkdirSync(path.dirname(outPath), { recursive: true }); fs.writeFileSync(outPath, content, "utf-8"); } console.log(`Extracted ${sourceMap.sources.length} source files to ${outDir}`); } extractSourceMap("cli.js.map", "./recovered-src"); ``` --- ## Key Architectural Patterns ### 1. CLI Entrypoint Bootstrap ```typescript // src/entrypoints/cli.ts (representative pattern) import { render } from "ink"; import React from "react"; import { App } from "../components/App"; import { parseArgs } from "../utils/args"; async function main() { const args = parseArgs(process.argv.slice(2)); if (args.command) { // Dispatch to named command handler const handler = await loadCommand(args.command); await handler.run(args); } else { // Default: launch interactive REPL via Ink render(React.createElement(App, { initialArgs: args })); } } main().catch((err) => { console.error(err); process.exit(1); }); ``` ### 2. Command Loading System Commands support built-in, dynamic skills, plugins, and MCP sources: ```typescript // src/commands/loader.ts (representative pattern) type CommandSource = "builtin" | "skill" | "plugin" | "mcp"; interface Command { name: string; source: CommandSource; description: string; run(args: ParsedArgs): Promise<void>; } async function loadCommand(name: string): Promise<Command> { // 1. Check built-in commands first const builtin = builtinCommands.get(name); if (builtin) return builtin; // 2. Check MCP-registered commands const mcpCmd = await mcpRegistry.resolve(name); if (mcpCmd) return mcpCmd; // 3. Dynamic skill loading const skill = await loadSkillCommand(name); if (skill) return skill; throw new Error(`Unknown command: ${name}`); } ``` ### 3. Ink/React Terminal UI Component Pattern ```typescript // src/components/ChatView.tsx (representative pattern) import React, { useState, useEffect } from "react"; import { Box, Text, useInput } from "ink"; import { useConversation } from "../hooks/useConversation"; interface ChatViewProps { sessionId: string; } export function ChatView({ sessionId }: ChatViewProps) { const { messages, sendMessage, isStreaming } = useConversation(sessionId); const [input, setInput] = useState(""); useInput((char, key) => { if (key.return) { sendMessage(input); setInput(""); } else if (key.backspace) { setInput((prev) => prev.slice(0, -1)); } else { setInput((prev) => prev + char); } }); return ( <Box flexDirection="column" height="100%"> <Box flexDirection="column" flexGrow={1} overflowY="hidden"> {messages.map((msg, i) => ( <Box key={i} marginBottom={1}> <Text color={msg.role === "assistant" ? "cyan" : "white"}> {msg.role === "assistant" ? "Claude: " : "You: "} </Text> <Text>{msg.content}</Text> </Box> ))} {isStreaming && <Text color="gray">▋</Text>} </Box> <Box borderStyle="single" paddingX={1}> <Text>{">"} </Text> <Text>{input}</Text> </Box> </Box> ); } ``` ### 4. MCP (Model Context Protocol) Integration ```typescript // src/services/mcpClient.ts (representative pattern) import { McpClient, Transport } from "@anthropic-ai/mcp"; interface McpServerConfig { name: string; command: string; args: string[]; env?: Record<string, string>; } class McpRegistry { private clients = new Map<string, McpClient>(); async connect(config: McpServerConfig): Promise<void> { const transport = new StdioTransport({ command: config.command, args: config.args, env: { ...process.env, ...config.env }, }); const client = new McpClient({ name: "claude-code", version: "2.1.88" }); await client.connect(transport); // Discover tools exposed by this MCP server const { tools } = await client.listTools(); for (const tool of tools) { this.registerTool(config.name, tool); } this.clients.set(config.name, client); } async callTool(serverName: string, toolName: string, args: unknown) { const client = this.clients.get(serverName); if (!client) throw new Error(`MCP server not connected: ${serverName}`); return client.callTool({ name: toolName, arguments: args as Record<string, unknown> }); } async resolve(commandName: string): Promise<Command | null> { // Map MCP tool names to CLI commands for (const [server, tools] of this.toolRegistry) { const tool = tools.find((t) => t.name === commandName); if (tool) { return { name: commandName, source: "mcp", description: tool.description ?? "", run: async (args) => { const result = await this.callTool(server, commandName, args); console.log(result.content); }, }; } } return null; } private toolRegistry = new Map<string, Array<{ name: string; description?: string }>>(); private registerTool(server: string, tool: { name: string; description?: string }) { const existing = this.toolRegistry.get(server) ?? []; this.toolRegistry.set(server, [...existing, tool]); } } export const mcpRegistry = new McpRegistry(); ``` ### 5. Authentication Utilities ```typescript // src/utils/auth.ts (representative pattern) import fs from "fs"; import path from "path"; import os from "os"; const CONFIG_DIR = path.join(os.homedir(), ".claude"); const CREDENTIALS_FILE = path.join(CONFIG_DIR, "credentials.json"); interface Credentials { apiKey?: string; sessionToken?: string; expiresAt?: string; } export function loadCredentials(): Credentials { if (!fs.existsSync(CREDENTIALS_FILE)) return {}; return JSON.parse(fs.readFileSync(CREDENTIALS_FILE, "utf-8")); } export function saveCredentials(creds: Credentials): void { fs.mkdirSync(CONFIG_DIR, { recursive: true }); fs.writeFileSync(CREDENTIALS_FILE, JSON.stringify(creds, null, 2), { mode: 0o600, // owner read/write only }); } export function getApiKey(): string { // Priority: env var > credentials file if (process.env.ANTHROPIC_API_KEY) { return process.env.ANTHROPIC_API_KEY; } const creds = loadCredentials(); if (creds.apiKey) return creds.apiKey; throw new Error("No API key found. Run `claude login` or set ANTHROPIC_API_KEY."); } ``` ### 6. Feature Flags Pattern ```typescript // src/utils/featureFlags.ts (representative pattern) // Feature flags are resolved at build time via bun:bundle macros // and at runtime via environment variables type FeatureFlag = | "ENABLE_MCP_STREAMING" | "ENABLE_TASKS_COMMAND" | "ENABLE_REVIEW_COMMAND" | "ENABLE_REMOTE_CAPABILITIES"; const RUNTIME_FLAGS: Record<FeatureFlag, boolean> = { ENABLE_MCP_STREAMING: process.env.CLAUDE_FF_MCP_STREAMING === "1", ENABLE_TASKS_COMMAND: process.env.CLAUDE_FF_TASKS === "1", ENABLE_REVIEW_COMMAND: process.env.CLAUDE_FF_REVIEW === "1", ENABLE_REMOTE_CAPABILITIES: process.env.CLAUDE_FF_REMOTE === "1", }; export function isEnabled(flag: FeatureFlag): boolean { return RUNTIME_FLAGS[flag] ?? false; } // Usage in command loader: // if (isEnabled("ENABLE_TASKS_COMMAND")) { // registerCommand(tasksCommand); // } ``` --- ## Commands Documented in Source | Command | Description | |---------|-------------| | `claude login` | OAuth/API key authentication flow | | `claude mcp` | Manage MCP server connections | | `claude review` | Code review workflow | | `claude tasks` | Task/todo management | | `claude config` | View and edit configuration | --- ## Hooks: Terminal State Management ```typescript // src/hooks/useConversation.ts (representative pattern) import { useState, useCallback, useRef } from "react"; import Anthropic from "@anthropic-ai/sdk"; export function useConversation(sessionId: string) { const [messages, setMessages] = useState<Message[]>([]); const [isStreaming, setIsStreaming] = useState(false); const clientRef = useRef(new Anthropic({ apiKey: process.env.ANTHROPIC_API_KEY })); const sendMessage = useCallback(async (content: string) => { const userMessage: Message = { role: "user", content }; setMessages((prev) => [...prev, userMessage]); setIsStreaming(true); let assistantContent = ""; try { const stream = await clientRef.current.messages.stream({ model: "claude-opus-4-5", max_tokens: 8096, messages: [...messages, userMessage].map((m) => ({ role: m.role, content: m.content, })), }); for await (const chunk of stream) { if ( chunk.type === "content_block_delta" && chunk.delta.type === "text_delta" ) {