Does it support CommonJS or only ES Modules?

While it prefers ESM (import/export) for new projects, it is capable of managing both ESM and CommonJS depending on the project context.

Which JavaScript versions are supported by this skill?

The skill is strictly focused on modern JavaScript, specifically ES2023+ features and Node.js 20 or higher.

Can I use this skill for frontend browser development?

Yes, it includes deep expertise in browser APIs, DOM optimization, Web Workers, and Fetch API implementations.

How does this skill handle asynchronous operations?

It exclusively uses async/await and Promise-based patterns, avoiding callback hell and ensuring robust error handling.

What is the testing philosophy for this skill?

It advocates for and generates comprehensive test files using Jest, aiming for a minimum of 85% code coverage for all new features.

JavaScript Pro

Name: JavaScript Pro
Author: Jeffallan

byJeffallan

•

API Development

Builds high-performance applications using modern ES2023+ features, asynchronous patterns, and full-stack JavaScript best practices.

About

JavaScript Pro is a specialized Claude Code skill that elevates AI-driven development to a senior engineering level, focusing on ES2023+ standards and Node.js 20+. It provides expert guidance on architectural patterns, asynchronous workflows, and modern module systems while ensuring code is performant, memory-efficient, and highly testable. Whether you are building complex backend services or optimizing browser-side logic, this skill ensures your implementation follows the latest industry best practices and functional programming principles.

Key Features

Expert-level asynchronous programming using modern Promise patterns and async/await
Modern Node.js development with optimized stream handling and worker threads
Advanced ES2023+ syntax implementation including private fields and top-level await
Browser performance optimization utilizing Web Workers and modern browser APIs
Automated generation of comprehensive Jest test suites with high coverage targets
7 GitHub stars

Use Cases

Implementing high-performance browser features and complex async data flows
Modernizing legacy JavaScript applications to use ESM and modern syntax
Architecting scalable Node.js backend services and server-side logic

About

Key Features

Expert-level asynchronous programming using modern Promise patterns and async/await
Modern Node.js development with optimized stream handling and worker threads
Advanced ES2023+ syntax implementation including private fields and top-level await
Browser performance optimization utilizing Web Workers and modern browser APIs
Automated generation of comprehensive Jest test suites with high coverage targets
7 GitHub stars

Use Cases

Implementing high-performance browser features and complex async data flows
Modernizing legacy JavaScript applications to use ESM and modern syntax
Architecting scalable Node.js backend services and server-side logic