Claude Code Power User

# Prompt: Review this pull request
Review the following diff for:
1. Type safety — any missing generics?
2. Error handling — are all edge cases covered?
3. Performance — any unnecessary re-renders?
4. Testing — what test cases are missing?

Focus on actionable improvements with code examples.

# Claude Code generates:
## Analysis: 3 issues found

### 1. Missing error boundary (HIGH)
Wrap async operations:
  try {
    await fetchData()
  } catch (error) {
    logger.error('Fetch failed', { error, userId })
    showToast('Unable to load data')
  }

### 2. Unnecessary re-render (MEDIUM)
Move `formatDate` outside component —
it doesn't depend on props/state.

### 3. Missing test case (LOW)
Add: "renders empty state when list is []"