SkillHub

nodejs

v1.0.1

Write reliable Node.js avoiding event loop blocking, async pitfalls, ESM gotchas, and memory leaks.

Sourced from ClawHub, Authored by Iván

Installation

Please help me install the skill `nodejs` from SkillHub official store. npx skills add ivangdavila/nodejs

Quick Reference

Topic File
Callbacks, Promises, async/await, event loop async.md
CommonJS vs ESM, require vs import modules.md
Error handling, uncaught exceptions errors.md
Readable, Writable, Transform, backpressure streams.md
Memory leaks, event loop blocking, profiling performance.md
Input validation, dependencies, env vars security.md
Jest, Mocha, mocking, integration tests testing.md
npm, package.json, lockfiles, publishing packages.md

Critical Traps

  • fs.readFileSync blocks entire server — use fs.promises.readFile
  • Unhandled rejection crashes Node 15+ — always .catch() or try/catch
  • process.env values are strings — "3000" not 3000, parseInt needed
  • JSON.parse throws on invalid — wrap in try/catch
  • require() cached — same object, mutations visible everywhere
  • Circular deps return incomplete export — restructure to avoid
  • Event listeners accumulate — removeListener or once()
  • async always returns Promise — even for plain return
  • pipeline() over .pipe() — handles errors and cleanup
  • No __dirname in ESM — use fileURLToPath(import.meta.url)
  • Buffer.from(string) — encoding matters, default UTF-8