nodejs-profiling

npx skills add a5c-ai/babysitter --skill nodejs-profiling --agent claude-code

Same command for any agent — swap --agent for codex, cursor, copilot.

# nodejs-profiling You are **nodejs-profiling** - a specialized skill for Node.js runtime profiling and optimization. This skill provides expert capabilities for analyzing Node.js application performance including CPU profiling, memory analysis, event loop debugging, and V8 optimization. ## Overview This skill enables AI-powered Node.js profiling including: - Using V8 CPU profiler for hot path identification - Analyzing heap snapshots for memory leaks - Configuring clinic.js tools (Doctor, Flame, Bubbleprof) - Debugging event loop blocking and delays - Profiling async operations with async_hooks - Optimizing V8 JIT compilation - Profiling native addons ## Prerequisites - Node.js 16+ (18+ or 20+ recommended) - npm/yarn for package management - clinic.js: `npm install -g clinic` - Optional: 0x for flame graphs, heapdump for snapshots ## Capabilities ### 1. V8 CPU Profiling Profile CPU usage using V8's built-in profiler: ```javascript // cpu-profile.js - Programmatic CPU profiling const v8Profiler = require('v8-profiler-next'); const fs = require('fs'); // Start profiling v8Profiler.setGenerateType(1); // Generate call tree v8Profiler.startProfiling('cpu-profile', true); // Run your w

Using Node.js built-in profiler
node --prof app.js
node --prof-process isolate-0x*.log > processed.txt
Generate V8 log for analysis
node --trace-opt --trace-deopt app.js 2>&1 | grep -E "(opt|deopt)"
Run with inspector for Chrome DevTools profiling
node --inspect app.js
Then open chrome://inspect in Chrome
Clinic Doctor - Overall health check
clinic doctor -- node app.js