sse

# SSE Skill Expert assistance for implementing Server-Sent Events for real-time streaming. ## Capabilities - Implement SSE endpoints - Handle streaming responses - Manage client connections - Build event-driven updates - Implement reconnection ## Usage Invoke this skill when you need to: - Stream updates to clients - Implement live feeds - Build notification systems - One-way real-time communication ## Implementation ```typescript // Server app.get('/events', (req, res) => { res.setHeader('Content-Type', 'text/event-stream'); res.setHeader('Cache-Control', 'no-cache'); res.setHeader('Connection', 'keep-alive'); const sendEvent = (event: string, data: object) => { res.write(`event: ${event}\n`); res.write(`data: ${JSON.stringify(data)}\n\n`); }; // Send initial data sendEvent('connected', { timestamp: Date.now() }); // Subscribe to updates const unsubscribe = eventEmitter.on('update', (data) => { sendEvent('update', data); }); req.on('close', () => { unsubscribe(); }); }); // Client const eventSource = new EventSource('/events'); eventSource.addEventListener('update', (event) => { const data = JSON.parse(event.data); console.log('Update:', data); }); ``` ## Best Practices - Handle reconnection - Use event types for routing - Implement keep-alive - Clean up on disconnect ## Target Processes - real-time-updates - live-feeds - notification-systems