majiayu000/claude-arsenal
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🏗️ Legacy Modernization Skill
legacy-modernization
Modernize legacy applications and codebases. Use for COBOL conversion, framework upgrades, and technical debt reduction.
SKILL.md
Full skill instructions
🏗️ Legacy Modernization Skill
Modernization Patterns
Strangler Fig Pattern
1. Create new service alongside legacy
2. Route new features to modern service
3. Gradually migrate existing features
4. Eventually retire legacy system
Anti-Corruption Layer
// Legacy API returns old format
const legacyResponse = await legacyApi.getUser(id);
// { usr_id: 1, usr_nm: 'John', usr_email: '[email protected]' }
// Transform to modern format
const modernUser = {
id: legacyResponse.usr_id,
name: legacyResponse.usr_nm,
email: legacyResponse.usr_email
};
Common Modernization Tasks
JavaScript Upgrades
// ES5 → ES6+
// var → const/let
var name = 'John'; // ❌
const name = 'John'; // ✅
// function → arrow
function add(a, b) { return a + b; } // Old
const add = (a, b) => a + b; // Modern
// Callback → Promise → Async/Await
// Callback
getData(function(err, data) { ... });
// Promise
getData().then(data => ...).catch(err => ...);
// Async/Await
const data = await getData();
jQuery → Vanilla JS
// jQuery
$('.button').click(function() { ... });
$('#result').html(data);
// Vanilla JS
document.querySelector('.button').addEventListener('click', () => { ... });
document.getElementById('result').innerHTML = data;
Class → Functional (React)
// Class Component
class Counter extends Component {
state = { count: 0 };
componentDidMount() { ... }
render() { return <div>{this.state.count}</div>; }
}
// Functional + Hooks
function Counter() {
const [count, setCount] = useState(0);
useEffect(() => { ... }, []);
return <div>{count}</div>;
}
Database Modernization
| From | To | Strategy |
|---|---|---|
| SQL Server | PostgreSQL | pg_chameleon |
| MySQL | PostgreSQL | pgloader |
| Oracle | PostgreSQL | ora2pg |
| MongoDB → SQL | Prisma | Custom scripts |
Modernization Checklist
- Document current architecture
- Identify pain points
- Create incremental plan
- Set up parallel testing
- Migrate with feature flags
- Monitor and validate
- Roll back if needed
- Decommission legacy
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