Javascript Pro
Writes, debugs, and refactors JavaScript code using modern ES2023+ features...
Install
npx skills add Jeffallan/claude-skills --skill javascript-pro -g -a claude-code -y- Repository
- Jeffallan/claude-skills12.2k
- Category
- Engineering
- Updated
- 5d ago
- License
- MIT
- Context cost
- Lightabout 1,043 tokens
- Runs scripts
- No, instructions only
What it does
Writes, debugs, and refactors JavaScript code using modern ES2023+ features, async/await patterns, ESM module systems, and Node.js APIs. Use when building vanilla JavaScript applications, implementing Promise-based async flows, optimising browser or Node.js performance, working with Web Workers or Fetch API, or reviewing .js/.mjs/.cjs files for correctness and best practices.
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/.cjsconventions - 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
Reference Guide
Load detailed guidance based on context:
| Topic | Reference | Load When |
|---|---|---|
| Modern Syntax | references/modern-syntax.md | ES2023+ features, optional chaining, private fields |
| Async Patterns | references/async-patterns.md | Promises, async/await, error handling, event loop |
| Modules | references/modules.md | ESM vs CJS, dynamic imports, package.json exports |
| Browser APIs | references/browser-apis.md | Fetch, Web Workers, Storage, IntersectionObserver |
| Node Essentials | references/node-essentials.md | fs/promises, streams, EventEmitter, worker threads |
