Automated summary
This skill provides modern JavaScript (ES6+) expertise covering async patterns, the event loop, and Node.js and browser APIs.
Strengths
- Explicitly covers promises, async/await, and generators with race condition prevention
- Addresses both Node.js and browser targets, including compatibility and polyfills
- Gives concrete guidance on handling errors at the right boundaries and writing async Jest tests
- Mentions bundle size and performance profiling for browser code
Limitations
- Does not provide TypeScript architecture guidance, only migration hints
- Excludes broader backend architecture decisions
- Advice stays fairly generic and depends on project context
Use it to write or debug modern asynchronous JavaScript for Node.js or the browser.
Avoid it when you need TypeScript or backend architecture guidance, or when working in a non-JS runtime.
Security analysis
SafeThe skill contains only general JavaScript guidance and does not declare or request tools, execute commands, access networks, handle secrets, or instruct destructive behavior. Execution risk is minimal.
No concerns found
How this analysis is madeExamples
My Node.js script processes jobs out of order and sometimes double-runs them. Can you review the async code and fix the race conditions?Convert this callback-based legacy JavaScript module to modern ES6+ with async/await and clean exports, adding JSDoc comments.This browser code uses newer APIs and breaks in older browsers. Suggest a polyfill strategy and check the bundle size impact.name: javascript-pro 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
- Identify runtime targets and constraints.
- Choose async patterns and module system.
- Implement with robust error handling.
- 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
- Prefer async/await over promise chains
- Use functional patterns where appropriate
- Handle errors at appropriate boundaries
- Avoid callback hell with modern patterns
- 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.
From the file to a first result
The download contains exactly the content displayed on this page. This copy may differ from the latest version in the source repository.
View the source and supporting filesThis download contains SKILL.md only. Any scripts, references, templates and dependencies are not included. Get the required files from the source, preserving their directory structure, before continuing.
1. Download the file
Download SKILL.mdFrom the root of a test project, save the file as .skill-downloads/modern-javascript-async-mrwakcn7/SKILL.md, or use the command below. This folder is for inspecting the skill before installation.
Command for macOS/Linux or WSL: requires a POSIX shell and curl. On Windows without WSL, use the download button and create the folder manually.
mkdir -p '.skill-downloads/modern-javascript-async-mrwakcn7' && curl --fail --show-error --location 'https://skills-guides.com/api/skills/modern-javascript-async-mrwakcn7/download' --output '.skill-downloads/modern-javascript-async-mrwakcn7/SKILL.md.part' && mv '.skill-downloads/modern-javascript-async-mrwakcn7/SKILL.md.part' '.skill-downloads/modern-javascript-async-mrwakcn7/SKILL.md'2. Check prerequisites
Read SKILL.md before using it. If it references scripts or external services, inspect them and prepare the required access in your test environment.
No recognized prerequisites section in this file. This does not mean it is self-contained: libraries, tools and access requirements may be mentioned elsewhere in the content or source repository.
The platforms on this page are catalog indications. The paths below follow tool documentation; they do not prove this skill has been run in those tools. No minimum tool version is confirmed for this listing.
3. Load the skill
After inspection, copy the complete folder into your project using one of the commands below, then open a new tool session. The command stops if a folder with the same name already exists: compare the files before replacing it.
Claude Code
test -f '.skill-downloads/modern-javascript-async-mrwakcn7/SKILL.md' && test -s '.skill-downloads/modern-javascript-async-mrwakcn7/SKILL.md' && mkdir -p '.claude/skills' && test ! -e '.claude/skills/javascript-pro' && cp -R '.skill-downloads/modern-javascript-async-mrwakcn7' '.claude/skills/javascript-pro'Cursor
test -f '.skill-downloads/modern-javascript-async-mrwakcn7/SKILL.md' && test -s '.skill-downloads/modern-javascript-async-mrwakcn7/SKILL.md' && mkdir -p '.cursor/skills' && test ! -e '.cursor/skills/javascript-pro' && cp -R '.skill-downloads/modern-javascript-async-mrwakcn7' '.cursor/skills/javascript-pro'Codex
test -f '.skill-downloads/modern-javascript-async-mrwakcn7/SKILL.md' && test -s '.skill-downloads/modern-javascript-async-mrwakcn7/SKILL.md' && mkdir -p '.agents/skills' && test ! -e '.agents/skills/javascript-pro' && cp -R '.skill-downloads/modern-javascript-async-mrwakcn7' '.agents/skills/javascript-pro'OpenSkills
OpenSkills must already be installed. The local install/read procedure is checked with OpenSkills 1.5.0, which requires Node.js ≥ 20.6.0. Catalog slugs are not resolved automatically.
Official OpenSkills installationopenskills install './.skill-downloads/modern-javascript-async-mrwakcn7'openskills read 'modern-javascript-async-mrwakcn7'Reading should display the installed file content and its base directory. It does not run the skill or install its dependencies.
For an agent that reads AGENTS.md, then sync the index. This command changes AGENTS.md: review the diff before using it.
openskills syncManual method or another tool: attach SKILL.md to a conversation, or open it in an agent that can read files. Include any required supporting resources. No universal folder is recognized by every tool.
4. Try a first task
Use a short, synthetic input: an API endpoint, a small document or an interface brief. In a new conversation, attach the file or give the agent its path, then adapt this request:
Read .skill-downloads/modern-javascript-async-mrwakcn7/SKILL.md and apply its instructions to this example: [describe a test input]. Identify any missing files, dependencies or access. Produce the result requested by the skill without inventing data or running unreviewed scripts.Expected result: output matching the skill instructions, or a precise list of missing prerequisites. A read confirmation alone does not validate a first use. If an external resource is unavailable, that path remains untested.
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