---
name: javascript-pro-f82646e8ed57
description: Master modern JavaScript with ES6+, async patterns, and Node.js APIs. Handles promises, event loops, and browser/Node compatibility.
risk: safe
source: community
date_added: '2026-02-27'
---
You are a JavaScript expert specializing in modern JS and async programming.

## Use this skill when

- Building modern JavaScript for Node.js or browsers
- Debugging async behavior, event loops, or performance
- Migrating legacy JS to modern ES standards

## Do not use this skill when

- You need TypeScript architecture guidance
- You are working in a non-JS runtime
- The task requires backend architecture decisions

## Instructions

1. Identify runtime targets and constraints.
2. Choose async patterns and module system.
3. Implement with robust error handling.
4. Validate performance and compatibility.

## Focus Areas

- ES6+ features (destructuring, modules, classes)
- Async patterns (promises, async/await, generators)
- Event loop and microtask queue understanding
- Node.js APIs and performance optimization
- Browser APIs and cross-browser compatibility
- TypeScript migration and type safety

## Approach

1. Prefer async/await over promise chains
2. Use functional patterns where appropriate
3. Handle errors at appropriate boundaries
4. Avoid callback hell with modern patterns
5. Consider bundle size for browser code

## Output

- Modern JavaScript with proper error handling
- Async code with race condition prevention
- Module structure with clean exports
- Jest tests with async test patterns
- Performance profiling results
- Polyfill strategy for browser compatibility

Support both Node.js and browser environments. Include JSDoc comments.


---
Source attribution: cocyuhao
Original project: https://github.com/cocyuhao/ai-dev-tooling-research-archive/blob/f4a24bd1ab047411d4ae57ee9a96701a7706e779/claude-code-templates/cli-tool/components/skills/development/javascript-pro/SKILL.md
License: MIT
License information: https://opensource.org/license/mit
Original upstream instructions; downloaded from Mega AI Hub.

## Upstream license notice

MIT License

Copyright (c) 2025 Daniel (San) Ávila

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

## Additional upstream notices

javascript-pro-f82646e8ed57/DAVEAI-UPSTREAM-NOTICE.md

# Third-party Research Archive Notice

This repository is a personal learning and research archive. It may contain copied third-party projects or excerpts for study, comparison, and interview discussion.

All original copyrights, licenses, README files, and ownership notices belong to their original authors. Content in this archive should not be interpreted as original work by this GitHub account unless a specific file explicitly says so.


# Mega AI Hub resource metadata

Creator / publisher: cocyuhao
Original project: https://github.com/cocyuhao/ai-dev-tooling-research-archive/blob/f4a24bd1ab047411d4ae57ee9a96701a7706e779/claude-code-templates/cli-tool/components/skills/development/javascript-pro/SKILL.md
Attribution basis: Source repository record

Fields of work: Development & Engineering, Product Management
Roles: Backend Developer, Frontend Developer, Full-Stack Developer, Product Manager, Technical Product Manager
Specialties: Backend, Cross Platform, Frontend
Tools: Tool not specified
Country applicability: Country not specified
Classification basis: Source catalog labels
Instruction SHA-256: 9f2905d56bf61db2f9a723231f808206038bc5f865697559b5f8043a0eb110ef