@cs124/cors

CORS (Cross-Origin Resource Sharing) configuration and middleware for the CS124 platform.

Overview

This library provides:

• CORS middleware configuration for Koa.js servers
• Standardized CORS policies across all CS124 services
• Development and production CORS settings

Installation

# This library is part of the CS124 monorepo
# Install dependencies via Rush
rush update

Usage

import { corsMiddleware } from "@cs124/cors"

// In your Koa server
app.use(corsMiddleware)

Development

Prerequisites

• Node.js 22.18.0
• Rush (for monorepo management)

Commands

# Build the library
rushx build

# Run quality checks
rushx check

# Format code
rushx prettier

# Lint code
rushx eslint

# Type check
rushx tsc

# Check for unused dependencies
rushx depcheck

Project Structure

lib/cors/
├── src/
│   └── index.ts         # Main CORS configuration
├── dist/                # Built output (generated)
├── package.json         # Dependencies and scripts
├── tsconfig.json        # TypeScript configuration
└── tsconfig.build.json  # Build-specific TypeScript config

Technology Stack

• Language: TypeScript (ES2019 target)
• Build: TypeScript compiler
• Target: Koa.js servers

Contributing

1. Always run rushx check before committing
2. Follow existing code conventions
3. Use TypeScript for type safety
4. Ensure all tests pass
5. Update documentation as needed