# UndoRedo Utility Audit

**Date**: 2025-01-27  
**Action**: 4.6.1.9  
**Status**: ✅ Complete

## Summary

The `undoRedo` utility (`apps/web/src/utils/undoRedo.ts`) is **completely unused** in the codebase. It was previously used by the Library Store but was removed when domain data was migrated to React Query (Action 4.1.2.5).

## Usage Analysis

### Imports
- ❌ **No imports found** in production code
- ❌ **No imports found** in test files
- ✅ Only mentioned in comments/docs indicating it was removed

### Type Exports
- `WithUndoRedo<T>` type exported in:
  - `apps/web/src/stores/types.ts` (line 14)
  - `apps/web/src/stores/index.ts` (line 28)
- These type exports are **not used** anywhere

### Functions Exported
1. `undoRedo()` - Zustand middleware for undo/redo functionality
2. `useUndoRedo()` - React hook for undo/redo
3. `UndoRedoManager` - Global undo/redo manager class
4. `undoRedoManager` - Singleton instance

**All functions are unused.**

## Historical Context

- Previously used by Library Store for undo/redo functionality on domain data
- Removed in Action 4.1.2.5 when Library Store domain data was migrated to React Query
- React Query handles state management, making undo/redo middleware unnecessary

## Recommendation

✅ **Safe to remove** - The utility is completely unused and can be deleted along with:
- `apps/web/src/utils/undoRedo.ts` (278 lines)
- `WithUndoRedo<T>` type from `apps/web/src/stores/types.ts`
- `WithUndoRedo` export from `apps/web/src/stores/index.ts`

## Next Steps

- **Action 4.6.1.10**: Remove undoRedo if unused ✅ (confirmed unused)
