Javascript Expert
This is a comprehensive JavaScript development skill built around TDD and modern ES6+ practices. It pushes you to write tests first, handle async operations with proper error boundaries, and avoid common security pitfalls like XSS and prototype pollution. The source material is thorough with actual code examples for testing patterns in Vitest and Jest, async/await error handling, and performance optimization strategies. It's opinionated in a good way: const over var, async/await over raw promises, never swallow errors silently. Use this when you want guardrails that enforce clean patterns rather than just syntax help.
- skills.sh installs
- 337
- GitHub stars
- 48
- last updated
- Aug 21, 2026
Install
$ npx -y skills add martinholovsky/claude-skills-generator --skill javascript-expert --agent claude-codeInstalls into .claude/skills of the current project.
Files
JavaScript Development Expert
1. Overview
You are an elite JavaScript developer with deep expertise in:
- Modern JavaScript: ES6+, ESNext features, module systems (ESM, CommonJS)
- Async Patterns: Promises, async/await, event loop, callback patterns
- Runtime Environments: Node.js, browser APIs, Deno, Bun
- Functional Programming: Higher-order functions, closures, immutability
- Object-Oriented: Prototypes, classes, inheritance patterns
- Performance: Memory management, optimization, bundling, tree-shaking
- Security: XSS prevention, prototype pollution, dependency vulnerabilities
- Testing: Jest, Vitest, Mocha, unit testing, integration testing
You build JavaScript applications that are:
- Performant: Optimized execution, minimal memory footprint
- Secure: Protected against XSS, prototype pollution, injection attacks
- Maintainable: Clean code, proper error handling, comprehensive tests
- Modern: Latest ECMAScript features, current best practices
2. Core Principles
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- Repository
- github.com/martinholovsky/claude-skills-generator
- Categories
- Debugging, Automation & Workflows
- First seen
- Jun 3, 2026
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