Name: javascript-pro
Availability: InStock
Author: jeffallan

Writes, debugs, and refactors JavaScript code using modern ES2023+ features, async/await patterns, ESM module systems, and Node.js APIs. Use when building…

SKILL.md

JavaScript Pro

When to Use This Skill

Building vanilla JavaScript applications

Implementing async/await patterns and Promise handling

Working with modern module systems (ESM/CJS)

Optimizing browser performance and memory usage

Developing Node.js backend services

Implementing Web Workers, Service Workers, or browser APIs

Core Workflow

Analyze requirements — Review package.json, module system, Node version, browser targets; confirm .js/.mjs/.cjs conventions

Design architecture — Plan modules, async flows, and error handling strategies

Implement — Write ES2023+ code with proper patterns and optimisations

Validate — Run linter (eslint --fix); if linter fails, fix all reported issues and re-run before proceeding. Check for memory leaks with DevTools or --inspect, verify bundle size; if leaks are found, resolve them before continuing

Test — Write comprehensive tests with Jest achieving 85%+ coverage; if coverage falls short, add missing cases and re-run. Confirm no unhandled Promise rejections