Fetches javascript-expert from martinholovsky/claude-skills-generator and configures it for Cursor.
3
Select Cursor when prompted
The CLI shows a list of agents. Use arrow keys and space to select Cursor:
◆ Which agents do you want to install to?
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│ ── Universal (.agents/skills) ────────────────
│ · Cline · Codex · Goose · Windsurf
│ ●Cursor(selected)
│ · Cursor · Aider · Continue
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Verify installation
Confirm successful installation by checking the skill directory location:
.cursor/skills/javascript-expert
Restart Cursor to activate javascript-expert. Access via /javascript-expert in your agent's command palette.
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Security Notice
We perform automated surface-level scans (Gen AI Scanner, Socket, Snyk) during installation. These checks detect common vulnerabilities but do not guarantee complete security. Always review skill source code and verify the publisher's reputation before production use.
Skills execute code in your environment. Always review source, verify the publisher, and test in isolation before production.
Avoid callback hell with promise chains or async/await
Use Promise.all() for parallel operations, Promise.allSettled() for error tolerance
Implement proper error propagation in async code
3. Security-First Development
You will write secure JavaScript code:
Sanitize all user inputs to prevent XSS attacks
Avoid eval(), Function() constructor, and dynamic code execution
Validate and sanitize data before DOM manipulation
Use Content Security Policy (CSP) headers
Prevent prototype pollution attacks
Implement secure authentication token handling
Regularly audit dependencies for vulnerabilities (npm audit, Snyk)
4. Performance Optimization
You will optimize JavaScript performance:
Minimize DOM manipulation, batch updates
Use event delegation over multiple event listeners
Implement debouncing/throttling for frequent events
Optimize loops (avoid unnecessary work in iterations)
Use Web Workers for CPU-intensive tasks
Implement code splitting and lazy loading
Profile with Chrome DevTools, identify bottlenecks
5. Error Handling and Debugging
You will implement robust error handling:
Use try/catch for synchronous code, .catch() for promises
Create custom error classes for domain-specific errors
Log errors with context (stack traces, user actions, timestamps)
Never swallow errors silently
Implement global error handlers (window.onerror, unhandledrejection)
Use structured logging in Node.js applications
4. Implementation Workflow (TDD)
Step 1: Write Failing Test First
// Using Vitestimport{ describe, it, expect }from'vitest';import{ calculateTotal, applyDiscount }from'../cart';describe('Cart calculations',()=>{it('should calculate total from items',()=>{const items =[{price:10,quantity:2},{price:5,quantity:3}];expect(calculateTotal(items)).toBe(35);});it('should apply percentage discount',()=>{const total =100;const discount =10;// 10%expect(applyDiscount(total, discount)).toBe(90);});it('should handle empty cart',()=>{expect(calculateTotal([])).toBe(0);});it('should throw on invalid discount',()=>{expect(()=>applyDiscount(100,-5)).toThrow('Invalid discount');});});// Using Jestdescribe('UserService',()=>{let userService;beforeEach(()=>{ userService =newUserService();});it('should fetch user by id',async()=>{const user =await userService.getById(1);expect(user).toHaveProperty('id',1);expect(user).toHaveProperty('name');});it('should throw on non-existent user',async()=>{awaitexpect(userService.getById(999)).rejects.toThrow('User not found');});});
// cart.js - Refactored with validationexportfunctioncalculateTotal(items){if(!Array.isArray(items)){thrownewTypeError('Items must be an array');}return items.reduce((sum
Implementation Guide
Prerequisites
›Claude Desktop or compatible AI client with skill support
›Clear understanding of task or problem to solve
›Willingness to iterate and refine outputs
Time Estimate
15-45 minutes depending on use case complexity
Steps
1Install skill using provided installation command
2Test with simple use case relevant to your work
3Evaluate output quality and relevance
4Iterate on prompts to improve results
5Integrate into regular workflow if valuable
Common Pitfalls
⚠Expecting perfect results without iteration
⚠Not providing enough context in prompts
⚠Using skill for tasks outside its intended scope
⚠Accepting outputs without review and validation
Best Practices
✓ Do
+Start with clear, specific prompts
+Provide relevant context and constraints
+Review and refine all outputs before using
+Iterate to improve output quality
+Document successful prompt patterns
✗ Don't
−Don't use without understanding skill limitations
−Don't skip validation of outputs
−Don't share sensitive information in prompts
−Don't expect skill to replace human judgment
💡 Pro Tips
★Be specific about desired format and style
★Ask for multiple options to choose from
★Request explanations to understand reasoning
★Combine AI efficiency with human expertise
When to Use This
✓ Use when
Use when skill capabilities match your task, clear ROI on time saved, and you can validate outputs. Best for repetitive tasks, learning, and quality improvement.
✗ Avoid when
Avoid when task requires deep expertise you can't validate, involves sensitive decisions, or when learning process is more valuable than speed of completion.
Learning Path
1Familiarize yourself with skill capabilities and limitations
2Start with low-risk, non-critical tasks
3Progress to more complex and valuable use cases
4Build expertise through regular use and experimentation
