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javascript-pro

combined

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. Master modern JavaScript with ES6+, async patterns, and Node.js

When to use

• 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
• Building modern JavaScript for Node.js or browsers
• Debugging async behavior, event loops, or performance

When not to use

• You need TypeScript architecture guidance
• You are working in a non-JS runtime
• The task requires backend architecture decisions
• Use this skill only when the task clearly matches the scope described above.
• Do not treat the output as a substitute for environment-specific validation, testing, or expert review.
• Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.

Skill page

Conflict

The three copies overlap on modern JavaScript, async/await, and Node/browser targets, but they disagree on scope and add material steps the others lack. Jeffallan/claude-skills is the most specific, mandating ES2023+, ESM, Jest 85%+ coverage, linting, memory-leak checks, and concrete code patterns. rmyndharis/antigravity-skills and sickn33/agentic-awesome-skills are nearly identical, but they explicitly include TypeScript migration and type safety, which the first copy excludes, and they add polyfill strategy and performance profiling. Crowning one copy would hide the TypeScript-migration alternative and the stricter validation constraints.