# Nodejs Core

Contributes to and debugs Node.js core, including nodejs/node commit and PR tone...

- Repository: https://github.com/mcollina/skills (1960 stars)
- Category: Git and review
- License: MIT
- Last updated: 2026-10-27
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add mcollina/skills --skill nodejs-core -g -a claude-code -y`
Codex: `npx skills add mcollina/skills --skill nodejs-core -g -a codex -y`
Cursor: `npx skills add mcollina/skills --skill nodejs-core -g -a cursor -y`
Gemini CLI: `npx skills add mcollina/skills --skill nodejs-core -g -a gemini-cli -y`

## Description

Contributes to and debugs Node.js core, including nodejs/node commit and PR tone, contribution workflows, native crashes, V8 performance, node-gyp builds, N-API bindings, and libuv issues. Use when drafting or reviewing a Node.js core commit or pull request, working in nodejs/node, or diagnosing C++ addons, binding.gyp failures, segfaults, native leaks, V8 deoptimizations, and event-loop internals.

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

## When to use

Use this skill when you need deep Node.js internals expertise, including:
- C++ addon development
- V8 engine debugging
- libuv event loop issues
- Build system problems
- Compilation failures
- Performance optimization at the engine level
- Understanding Node.js core architecture
- Writing or reviewing `nodejs/node` commits and pull request descriptions

## How to use

Read individual rule files for detailed explanations and code examples:

### V8 Engine

- [rules/v8-garbage-collection.md](rules/v8-garbage-collection.md) - Scavenger, Mark-Sweep, Mark-Compact, generational GC
- [rules/v8-hidden-classes.md](rules/v8-hidden-classes.md) - Hidden classes, inline caching, optimization
- [rules/v8-jit-compilation.md](rules/v8-jit-compilation.md) - TurboFan, optimization/deoptimization patterns

### libuv

- [rules/libuv-event-loop.md](rules/libuv-event-loop.md) - Event loop phases, timers, I/O, idle, check, close
- [rules/libuv-thread-pool.md](rules/libuv-thread-pool.md) - Thread pool size, blocking operations, UV_THREADPOOL_SIZE
- [rules/libuv-async-io.md](rules/libuv-async-io.md) - Async I/O patterns, handles, requests

### Native Addons

- [rules/napi.md](rules/napi.md) - N-API development, ABI stability, async workers
- [rules/node-addon-api.md](rules/node-addon-api.md) - C++ wrapper patterns, best practices
- [rules/native-memory.md](rules/native-memory.md) - Buffer handling, external memory, prevent leaks

### Core Modules Internals

The rest: https://github.com/mcollina/skills/blob/HEAD/skills/nodejs-core/SKILL.md