typescript-refactor

Development

Safely refactor TypeScript code while maintaining type safety and test coverage. Includes verification steps.

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Source SKILL.md: https://github.com/majiayu000/claude-skill-registry/blob/HEAD/skills/development/typescript-refactor-cpa03-blueprintify-64da486f/SKILL.md

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TypeScript Refactor Skill

Safely refactor TypeScript code with full verification.

Pre-Refactor Checklist

Run current tests to establish baseline:
```
npm run test
```
Run type check:
```
npm run typecheck
```
Note current state as baseline

Refactoring Patterns

Extract Function

// Before
function process(data: Data) {
  // complex validation logic
  if (!data.field1) throw new Error("field1 required");
  if (!data.field2) throw new Error("field2 required");
  // ... more processing
}

// After
function validateData(data: Data): void {
  if (!data.field1) throw new Error("field1 required");
  if (!data.field2) throw new Error("field2 required");
}

function process(data: Data) {
  validateData(data);
  // ... more processing
}

Extract Component (React)

// Before: Large component with repeated patterns
// After: Smaller, focused components with clear props

Rename Symbol

# Find all usages first
grep -r "oldName" --include="*.ts" --include="*.tsx" src/

Post-Refactor Verification

Run type check:
```
npm run typecheck
```
Run tests:
```
npm run test
```
Run linter:
```
npm run lint
```
Build project:
```
npm run build
```

Rules

Never change behavior during refactor
One refactor type at a time
Commit after each successful refactor
If tests fail, rollback immediately