# Refactor Code

Intelligent code refactoring command that analyzes code structure and applies best practices for improved maintainability and performance

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## Metadata

**Title:** Refactor Code
**Category:** commands
**Author:** JSONbored
**Added:** September 2025
**Tags:** refactoring, code-quality, cleanup, optimization, patterns
**URL:** https://claudepro.directory/commands/refactor-code

## Overview

Intelligent code refactoring command that analyzes code structure and applies best practices for improved maintainability and performance

## Content

The /refactor command provides intelligent code refactoring capabilities with multiple strategies and safety checks.
USAGE

 /refactor [options]

OPTIONS
Refactoring Types
• --extract-function - Extract repeated code into functions
• --extract-variable - Extract complex expressions into variables
• --extract-constant - Move magic numbers/strings to constants
• --inline - Inline simple functions/variables
• --rename - Rename variables/functions for clarity
• --simplify - Simplify complex conditional logic
• --modernize - Update to modern language features
• --performance - Apply performance optimizations
Safety Options
• --dry-run - Show proposed changes without applying
• --interactive - Prompt for each change
• --backup - Create backup before refactoring
• --test-first - Run tests before and after changes
Language-Specific Options
• --javascript - Apply JS/TS specific refactoring
• --python - Apply Python-specific refactoring
• --java - Apply Java-specific refactoring
• --csharp - Apply C#-specific refactoring
EXAMPLES
Extract Function

 // Before
 function processUsers(users) {
 for (let user of users) {
 if (user.email && user.email.includes('@')) {
 user.isValid = true;
 user.domain = user.email.split('@')[1];
 } else {
 user.isValid = false;
 user.domain = null;
 }
 }
 }
 // After refactoring with --extract-function
 function validateEmail(email) {
 return email && email.includes('@');
 }
 function extractDomain(email) {
 return email.split('@')[1];
 }
 function processUsers(users) {
 for (let user of users) {
 if (validateEmail(user.email)) {
 user.isValid = true;
 user.domain = extractDomain(user.email);
 } else {
 user.isValid = false;
 user.domain = null;
 }
 }
 }

Extract Constants

 # Before
 def calculate_discount(price, customer_type):
 if customer_type == "premium":
 return price * 0.2
 elif customer_type == "regular":
 return price * 0.1
 else:
 return 0
 # After refactoring with --extract-constant
 PREMIUM_DISCOUNT_RATE = 0.2
 REGULAR_DISCOUNT_RATE = 0.1
 PREMIUM_CUSTOMER_TYPE = "premium"
 REGULAR_CUSTOMER_TYPE = "regular"
 def calculate_discount(price, customer_type):
 if customer_type == PREMIUM_CUSTOMER_TYPE:
 return price * PREMIUM_DISCOUNT_RATE
 elif customer_type == REGULAR_CUSTOMER_TYPE:
 return price * REGULAR_DISCOUNT_RATE
 else:
 return 0

Modernize Code

 // Before (ES5 style)
 function getUserNames(users) {
 var names = [];
 for (var i = 0; i user.active)
 .map(user => user.name);
 }

REFACTORING PATTERNS
Design Patterns
• Strategy Pattern - Replace conditional logic with strategy objects
• Factory Pattern - Extract object creation logic
• Observer Pattern - Implement event-driven architecture
• Decorator Pattern - Add functionality without inheritance
Code Smells Detection
• Long Method - Break down large functions
• Large Class - Split into focused classes
• Duplicate Code - Extract common functionality
• Long Parameter List - Use parameter objects
• Feature Envy - Move methods to appropriate classes
Performance Optimizations
• Lazy Loading - Load resources only when needed
• Memoization - Cache expensive computations
• Batch Operations - Combine multiple operations
• Async Optimization - Convert synchronous to asynchronous
SAFETY MEASURES
Pre-refactoring Checks
• Syntax validation
• Type checking (TypeScript, etc.)
• Lint rule compliance
• Test coverage analysis
Post-refactoring Validation
• Automated test execution
• Code quality metrics comparison
• Performance benchmarking
• Security vulnerability scanning
INTEGRATION
IDE Integration
• VS Code extension support
• IntelliJ plugin compatibility
• Vim/Neovim integration
• Emacs package support
CI/CD Integration
• Pre-commit hooks
• GitHub Actions workflow
• GitLab CI pipeline
• Jenkins job integration
CONFIGURATION
Create a .refactor.json file in your project root:

 {
 "rules": {
 "maxFunctionLength": 20,
 "maxParameterCount": 4,
 "enforceConstantExtraction": true,
 "modernizeFeatures": true
 },
 "exclude": [
 "node_modules/**",
 "dist/**",
 "*.test.js"
 ],
 "backup": {
 "enabled": true,
 "directory": ".refactor-backups"
 }
 }

INSTALLATION
CLAUDE CODE:
1) Create commands directory: mkdir -p .claude/commands
2) Create command file: touch .claude/commands/refactor-code.md
3) Add command content from the Command Content section above to .claude/commands/refactor-code.md
4) Command is now available as /refactor-code in Claude Code
5) Optional: Create personal version in ~/.claude/commands/refactor-code.md for global access
Requirements:
? Claude Code CLI installed
? Project directory initialized (for project commands)
CONFIGURATION
Temperature: 0.3
Max Tokens: 
System Prompt:
You are a code refactoring expert focused on improving code quality, maintainability, and performance while preserving functionality
TROUBLESHOOTING
1) Refactoring breaks tests or changes functional behavior unexpectedly
 Solution: Use --test-first to run tests before and after. Enable --dry-run to preview changes. Create git commit before refactoring: git commit -am 'pre-refactor'.
2) Modernize flag introduces breaking changes or incompatible syntax
 Solution: Specify language version explicitly: --javascript --es2020. Check Node.js/browser target compatibility. Use --interactive to approve each modernization.
3) Refactored code fails linting or type checking after transformation
 Solution: Run linter before refactoring: npm run lint. Enable --backup to preserve original. Fix type errors: tsc --noEmit before applying changes.
4) Command fails with parse errors on valid source code files
 Solution: Verify language version matches codebase: check package.json engines. Update parser: npm update @babel/parser. Use --language flag explicitly for mixed-syntax files.
5) Large codebase refactoring times out or consumes excessive memory
 Solution: Process files incrementally: /refactor src/module1 first. Increase Node.js memory: NODEOPTIONS=--max-old-space-size=. Use --exclude for nodemodules.
TECHNICAL DETAILS
Documentation: https://docs.claude.ai/commands/refactor


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Source: Claude Pro Directory
Website: https://claudepro.directory
URL: https://claudepro.directory/commands/refactor-code

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