Nodejs Core

What it does

This skill provides deep expertise in Node.js internals, enabling an AI agent to assist with complex backend development tasks related to native modules, V8 engine optimization, libuv diagnostics, and C++ addon development. It covers areas like garbage collection, event loop phases, thread pool tuning, N-API bindings, and build system troubleshooting. The skill is organized into rule files containing code examples for various Node.js core components.

When to use it

• Developing C++ addons for Node.js
• Debugging issues within the V8 JavaScript engine
• Troubleshooting problems related to the libuv event loop
• Resolving build system and compilation failures in Node.js projects
• Optimizing performance at a low level, specifically within the Node.js runtime environment
• Understanding the underlying architecture of Node.js

Key capabilities

• Expertise in V8 garbage collection (Scavenger, Mark-Sweep, Mark-Compact, generational GC)
• Knowledge of hidden classes and inline caching optimization techniques
• Understanding of JIT compilation and deoptimization patterns within V8
• Detailed knowledge of libuv event loop phases and thread pool management
• Proficiency in N-API and node-addon-api binding patterns for C++ addons
• Guidance on build systems including node-gyp, gyp, and ninja.

Example prompts

• "Explain how V8's generational garbage collection works."
• "I'm getting performance regressions in my Node.js application; can you help me diagnose the issue related to the event loop?"
• "How do I debug a segfault in my Node.js addon using gdb/lldb?"

Tips & gotchas

• This skill is designed for developers with existing Node.js experience who need to delve into its internals.
• The skill's knowledge is distributed across multiple rule files; consult the individual rules for specific topics and code examples.
• Expect detailed technical explanations related to low-level engine behavior and C++ development practices.