# Code Review: PRD Button Synchronization Fix

**Date:** 2026-01-06
**Reviewer:** Claude Code
**Component:** Dashboard, DiscoveryProgress, PRDModal
**Branch:** feature/prd-button-sync-fix

## Context Analysis

**Code Type:** React/TypeScript UI components
**Risk Level:** Low - UI state synchronization, no security-sensitive changes
**Business Impact:** UX improvement - fixes confusing button state desynchronization

## Review Plan

- ✅ Reliability (error handling, edge cases)
- ✅ Code quality and maintainability
- ✅ Test coverage
- ❌ Skip OWASP Web/LLM/ML checks (not applicable)
- ❌ Skip Zero Trust checks (no auth changes)

## Changes Summary

| File | Changes |
|------|---------|
| Dashboard.tsx | Added SWR mutate, WebSocket listener for PRD sync |
| DiscoveryProgress.tsx | PRD state initialization on mount, Restart Discovery button |
| PRDModal.tsx | onRetry callback prop for manual refresh |
| prd-button-sync.test.tsx | 12 new integration tests |

## Findings

### ✅ Strengths

1. **Proper WebSocket Cleanup**
   - Cleanup function prevents memory leaks
   - Returns unsubscribe function correctly

2. **Project ID Filtering**
   - Correctly filters WebSocket messages by project_id
   - Prevents cross-project updates

3. **Graceful Error Handling**
   - PRD fetch failure doesn't break the component
   - Falls back to default state with console warning

4. **Comprehensive Test Coverage**
   - 12 integration tests
   - Covers WebSocket sync, state initialization, tab revisit, restart functionality

### ⚠️ Minor Issues (Non-blocking)

1. **TypeScript Any Type**
   - Location: Dashboard.tsx line 230
   - Issue: Using `any` for WebSocket message type
   - Recommendation: Use `WebSocketMessage` type from codebase
   - Priority: Low

2. **Stale Closure Risk**
   - Location: Dashboard.tsx handlePRDEvent closure
   - Issue: `projectId` captured in closure
   - Impact: None - projectId is stable prop
   - Priority: Info only

## Test Results

```
Test Suites: 1 passed, 1 total
Tests:       12 passed, 12 total
```

## Verdict

**APPROVED** ✅

The code is well-structured, properly handles errors, has comprehensive test coverage, and follows existing patterns in the codebase.

## Checklist

- [x] Code follows project conventions
- [x] Error handling is appropriate
- [x] Tests cover new functionality
- [x] No security vulnerabilities introduced
- [x] No breaking changes to existing functionality
