Refactor Clean Command

Analyze and clean up the codebase: $ARGUMENTS

Your Task

1. Detect dead code using analysis tools
2. Identify duplicates and consolidation opportunities
3. Safely remove unused code with documentation
4. Verify no functionality broken

Detection Phase

Run Analysis Tools

# Find unused exports
npx knip

# Find unused dependencies
npx depcheck

# Find unused TypeScript exports
npx ts-prune

Manual Checks

• Unused functions (no callers)
• Unused variables
• Unused imports
• Commented-out code
• Unreachable code
• Unused CSS classes

Removal Phase

Before Removing

1. Search for usage - grep, find references
2. Check exports - might be used externally
3. Verify tests - no test depends on it
4. Document removal - git commit message

Safe Removal Order

1. Remove unused imports first
2. Remove unused private functions
3. Remove unused exported functions
4. Remove unused types/interfaces
5. Remove unused files

Consolidation Phase

Identify Duplicates

• Similar functions with minor differences
• Copy-pasted code blocks
• Repeated patterns

Consolidation Strategies

1. Extract utility function - for repeated logic
2. Create base class - for similar classes
3. Use higher-order functions - for repeated patterns
4. Create shared constants - for magic values

Verification

After cleanup:

1. npm run build - builds successfully
2. npm test - all tests pass
3. npm run lint - no new lint errors
4. Manual smoke test - features work

Report Format

Dead Code Analysis
==================

Removed:
- file.ts: functionName (unused export)
- utils.ts: helperFunction (no callers)

Consolidated:
- formatDate() and formatDateTime() → dateUtils.format()

Remaining (manual review needed):
- oldComponent.tsx: potentially unused, verify with team

CAUTION: Always verify before removing. When in doubt, ask or add // TODO: verify usage comment.