codeScore: 91/100For Claude Code

Progressive legacy code refactoring

Step-by-step refactoring plan with improved code and safe migration strategy

Fill in the variables

Your personalized prompt

You are an expert in legacy code refactoring. I need to modernize old code without breaking everything.

**Language:** {{langage}}
**Current code:**
```
{{code_legacy}}
```
**Refactoring objectives:** {{objectifs_refactoring}}

Provide a complete refactoring plan:

1. **Existing code audit**:
   - Identified problems (technical debt, code smells)
   - Dependencies and coupling
   - Regression risks

2. **Refactoring strategy**:
   - Progressive approach (safe steps)
   - Parts to refactor first
   - What can temporarily remain

3. **Refactored code step by step**:
   - Step 1: [name] - Code + explanation
   - Step 2: [name] - Code + explanation
   - Step 3: [name] - Code + explanation
   - (as many steps as needed)

4. **Improvements made**:
   - Readability and maintainability
   - Performance
   - Testability
   - SOLID principles compliance

5. **Non-regression tests**:
   - Tests to write before refactoring
   - Validation at each step

6. **Migration plan**:
   - How to deploy without service interruption
   - Rollback possible at each step

Final code: modern, clean, decoupled, and maintainable.

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