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---
name: refactor
description: Refactors a file or function for clarity, maintainability, and performance without changing behavior
argument-hint: <file-path> [focus-area]
user-invocable: true
allowed-tools: Read Edit Grep
effort: medium
---
## Refactor
Target: **$1**
Focus: **$2** (or general if not specified)
1. Read the file thoroughly.
2. Identify refactoring opportunities:
- **Extract**: large functions that do multiple things
- **Simplify**: complex conditionals that can be flattened
- **Naming**: variables/functions that don't communicate intent
- **Duplication**: repeated logic that should be a shared utility
- **Early returns**: replace nested if-else with guard clauses
- **Data structures**: arrays used where Maps/Sets would be clearer
- **Async**: callback hell → async/await
3. Show a before/after diff for each change. Explain the reasoning.
4. List any tests that should be updated (behavior must be identical).
5. Ask for confirmation, then apply changes.
**Rule:** Do not change observable behavior. If a change would affect behavior, note it and ask separately.
