Bug Hunt

Systematically analyze code for bugs, logic errors, and potential runtime issues.

Scope

1. Logic Errors

• Off-by-one errors in loops/arrays
• Incorrect boolean logic
• Missing edge cases
• Null/undefined handling gaps
• Race conditions in async code

2. State Management Issues

• Stale closures in useEffect/useCallback
• Missing dependency array items
• State updates on unmounted components
• Inconsistent state transitions
• Derived state that should be computed

3. Data Handling

• Array mutations instead of immutable updates
• Object reference equality issues
• Missing data validation
• Incorrect data transformations
• Timezone handling errors with date-fns

4. Async/Await Pitfalls

• Unhandled promise rejections
• Missing try/catch blocks
• Parallel execution that should be sequential
• Sequential execution that should be parallel
• Missing loading/error states

5. React-Specific Issues

• Missing keys in lists
• Conditional hooks (violates rules of hooks)
• Memory leaks (uncleared intervals, subscriptions)
• Incorrect useEffect cleanup
• Re-render loops

6. API & Database

• Missing error handling on fetch calls
• Incorrect HTTP methods
• Missing request validation
• SQL/Drizzle query errors
• Missing transaction boundaries

7. Type Coercion Issues

• Loose equality (== vs ===)
• Implicit type conversions
• parseInt without radix
• Boolean coercion edge cases

Output Format

For each finding:

[SEVERITY: CRITICAL|HIGH|MEDIUM|LOW]
[TYPE: LOGIC|STATE|DATA|ASYNC|REACT|API|TYPES]
File: path/to/file.ts:lineNumber
Bug: Brief description
Reproduction: How the bug manifests
Root Cause: Why it happens
Fix: Code snippet or approach

Actions

1. Read through code systematically
2. Trace data flow through functions
3. Check boundary conditions
4. Verify error handling paths
5. Look for common anti-patterns

Bug Categories by Likelihood

High probability areas:

• Recently changed code
• Complex conditional logic
• Async operations
• User input handling
• Date/time calculations

Post-Review

Generate:

• Critical bugs requiring immediate fix
• Medium-priority bugs for next sprint
• Low-priority improvements
• Suggested tests to prevent regression