websocket

# WebSocket Skill Expert assistance for implementing WebSocket real-time communication. ## Capabilities - Implement WebSocket servers - Handle connection lifecycle - Build pub/sub patterns - Scale with Redis adapter - Implement reconnection logic - Handle authentication ## Usage Invoke this skill when you need to: - Add real-time features - Build chat applications - Implement live updates - Handle bidirectional communication ## Server Implementation ```typescript import { WebSocketServer, WebSocket } from 'ws'; import { createServer } from 'http'; const server = createServer(); const wss = new WebSocketServer({ server }); const clients = new Map<string, WebSocket>(); wss.on('connection', (ws, req) => { const userId = authenticateConnection(req); clients.set(userId, ws); ws.on('message', (data) => { const message = JSON.parse(data.toString()); handleMessage(userId, message); }); ws.on('close', () => { clients.delete(userId); }); }); function broadcast(message: object) { const data = JSON.stringify(message); clients.forEach((client) => { if (client.readyState === WebSocket.OPEN) { client.send(data); } }); } ``` ## Best Practices - Implement heartbeat/ping-pong - Handle reconnection gracefully - Use message queues for scaling - Authenticate connections ## Target Processes - real-time-features - chat-application - live-updates