refactor

Refactor Plugin

Agent and skills for code simplification and refactoring to improve code quality while preserving functionality.

Version: 1.5.5

Installation

claude plugin install refactor@frad-dotclaude

Overview

Provides specialized tools for code simplification and refactoring. Includes an expert code simplifier agent and skills for targeted and project-wide refactoring. All refactoring operations preserve functionality while improving clarity, consistency, and maintainability.

Directory Structure

refactor/
├── .claude-plugin/
│   └── plugin.json          # Plugin manifest
├── agents/
│   └── code-simplifier.md   # Expert refactoring agent
├── skills/
│   ├── best-practices/      # Knowledge skill (internal)
│   │   ├── SKILL.md
│   │   └── references/      # 110 reference files
│   │       ├── typescript.md
│   │       ├── python.md (+ python/ subdir)
│   │       ├── go.md
│   │       ├── swift.md
│   │       ├── universal.md
│   │       └── react/rules/ # 57 Next.js/React patterns
│   ├── refactor/            # Instruction skill (user-invocable)
│   │   └── SKILL.md
│   └── refactor-project/    # Instruction skill (user-invocable)
│       └── SKILL.md
└── README.md

Agent

code-simplifier

Expert code simplification specialist that enhances code clarity, consistency, and maintainability while preserving functionality. Automatically loads refactor:best-practices skill for language-specific standards.

Usage:

@code-simplifier Simplify the authentication logic in src/auth/login.ts

For details, see agents/code-simplifier.md.

Skills

best-practices (Internal)

Provides language-specific best practices, code quality standards, and framework detection for refactoring workflows. Automatically loaded by code-simplifier agent.

Language Support: TypeScript, Python, Go, Swift, JavaScript Framework Support: React (57 performance patterns), Next.js

For details, see skills/best-practices/SKILL.md.

/refactor

Quick refactoring for recently modified or specified code.

Usage:

# Refactor recently modified code
/refactor

# Refactor specific files
/refactor src/auth/login.ts src/utils/

Launches code-simplifier agent with targeted scope. For details, see skills/refactor/SKILL.md.

/refactor-project

Project-wide code refactoring across entire codebase.

Usage:

/refactor-project

Launches code-simplifier agent with project-wide scope, emphasizing cross-file duplication reduction and consistent patterns. For details, see skills/refactor-project/SKILL.md.

Quick Start

Targeted Refactoring

# Refactor recent changes
/refactor

# Refactor specific files
/refactor src/auth/login.ts

Project-Wide Refactoring

/refactor-project

Using Agent Directly

@code-simplifier Simplify the authentication logic in src/auth/login.ts

Example Refactoring

TypeScript: Reducing Complexity

Before:

function processUser(user: any) {
  if (user) {
    if (user.age) {
      if (user.age >= 18) {
        if (user.verified) {
          return { status: 'active', user: user };
        } else {
          return { status: 'unverified', user: user };
        }
      } else {
        return { status: 'minor', user: user };
      }
    }
  }
  return { status: 'invalid', user: null };
}

After:

interface User {
  age: number;
  verified: boolean;
}

function processUser(user: User | null): { status: string; user: User | null } {
  // Early returns for guard clauses
  if (!user?.age) {
    return { status: 'invalid', user: null };
  }

  if (user.age < 18) {
    return { status: 'minor', user };
  }

  const status = user.verified ? 'active' : 'unverified';
  return { status, user };
}

Improvements:

• Eliminated nested conditionals with guard clauses
• Added proper TypeScript types
• Reduced cognitive complexity
• Made logic flow more obvious and testable

Next.js: Eliminating Waterfalls

Demonstrates parallelizing independent async operations to eliminate sequential waterfalls. See skills/best-practices/references/react/rules/async-parallel.md for detailed examples.

Python: Applying DRY and Type Safety

Demonstrates eliminating code duplication using Enums and type hints. See skills/best-practices/references/python.md for comprehensive patterns.

Key Features

• Language Support: TypeScript, JavaScript, Python, Go, Swift
• Framework Support: Next.js (57 performance patterns), React
• Automated Workflow: Agent-driven refactoring with best practices
• Safe Refactoring: Preserves functionality, uses git for rollback
• Impact-Based: Prioritizes CRITICAL > HIGH > MEDIUM > LOW improvements

Best Practices

• Refactor frequently during development
• Use /refactor for targeted improvements
• Use /refactor-project for major modernization
• Review changes to ensure functionality is preserved
• Run tests after refactoring to validate
• Trust git for rollback if needed

Requirements

• Git repository for change tracking
• Test suite for validation (recommended)
• Lint/build tools for quality checks (recommended)

Troubleshooting

Q: Will refactoring break my code? A: No. The agent preserves functionality. Always run tests after refactoring.

Q: Refactoring changes too much A: Use /refactor with specific files for targeted changes. Review changes before committing.

Q: What's the difference between /refactor and /refactor-project? A: /refactor is for targeted changes (recent/specified files). /refactor-project is for entire codebase.

For more FAQs and detailed troubleshooting, see individual skill documentation in skills/.

Author

Frad LEE (fradser@gmail.com)

Credits

React/Next.js Best Practices:

• React and Next.js performance optimization guidelines are sourced from Vercel Engineering's agent-skills repository
• Contains 40+ rules across 8 categories, prioritized by impact
• Originally created by @shuding at Vercel