Individual skill

javascript-pro

Idiomatic modern JavaScript: ES2022+ features, async patterns, modules, and runtime behavior mastery. Use when writing, reviewing, or debugging JavaScript.

skills/javascript-pro/SKILL.md

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# JavaScript Pro

## Overview

Modern JavaScript (ES2022+) is **a capable, expressive language** — but its flexibility (dynamic
typing, `this` quirks, coercion, event loop) punishes the casual. Professional JavaScript means
knowing the runtime deeply (event loop, promises, modules), writing in modern idioms (not 2012
jQuery-era patterns), handling async structurally, and choosing when types (TypeScript/JSDoc) are
worth it.

The through-line: master the event loop and the module system, write async as linear code, and
respect the dynamism — validate at boundaries.

## When to use