# NPM Support Implementation

## Overview
Successfully implemented NPM package support for cc-switch, allowing JavaScript/Node.js developers to install and use the CLI tool through familiar NPM commands.

## Files Created
- `package.json`: NPM package configuration with binary distribution setup
- `install.js`: Smart installation script that downloads platform-specific binaries from GitHub releases
- `index.js`: Node.js wrapper that forwards arguments to the native binary
- `.npmignore`: NPM-specific ignore file to exclude Rust source and build artifacts
- `NPM_INSTALLATION.md`: Comprehensive usage guide for NPM installation

## Key Features
- **Platform Detection**: Automatically detects OS and architecture (macOS x64/arm64, Linux x64/arm64, Windows x64)
- **Binary Distribution**: Downloads pre-compiled binaries from GitHub releases during npm install
- **Cross-Platform Support**: Works on all major platforms with appropriate binary selection
- **Error Handling**: Comprehensive error messages and troubleshooting guidance
- **NPX Compatibility**: Supports both global installation and npx usage

## Installation Methods
1. **Global Install**: `npm install -g cc-switch`
2. **Local Install**: `npm install cc-switch` + `npx cc-switch`
3. **One-time Use**: `npx cc-switch@latest`

## Platform Mapping
- macOS x64 → x86_64-apple-darwin
- macOS arm64 → aarch64-apple-darwin  
- Linux x64 → x86_64-unknown-linux-musl
- Linux arm64 → aarch64-unknown-linux-musl
- Windows x64 → x86_64-pc-windows-gnu

## Testing Status
- ✅ Package creation (npm pack)
- ✅ Global installation test
- ✅ Binary execution test
- ✅ Help and version commands
- ⚠️ Local installation (network issues during testing)

## Integration Points
- GitHub Releases: Downloads binaries from release assets
- NPM Registry: Ready for publishing to npmjs.com
- Version Sync: NPM version matches Rust crate version (0.0.31)
- Documentation: Updated README.md with NPM installation instructions

## Usage Example
```bash
npm install -g cc-switch
cc-switch add my-config sk-ant-xxx https://api.anthropic.com
cc-switch use my-config
```