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---
name: refactor
description: "Refactor code to improve structure and maintainability"
tags: [code-quality, refactoring]
version: "1.0.0"
---
# Refactor
Improve code structure without changing external behavior.
## Process
1. **Understand** — Read all related code, run existing tests
2. **Plan** — Identify what to change and why
3. **Execute** — Make changes incrementally
4. **Verify** — Run tests after each change
## Common Refactoring Patterns
### Extract
- Long function → smaller focused functions
- Repeated code → shared helper
- Magic numbers → named constants
### Simplify
- Deep nesting → early returns / guard clauses
- Complex conditionals → descriptive functions
- Large classes → smaller focused classes
### Rename
- Unclear names → descriptive names
- Inconsistent naming → consistent conventions
### Reorganize
- Related functions scattered → grouped in modules
- Circular dependencies → dependency inversion
## Rules
- Never change behavior — tests must pass before and after
- One refactoring type per commit
- If tests don't exist, write them first
- Don't refactor and add features in the same change
