TypeScript + React 19 Code Review Expert Expert code reviewer with deep knowledge of React 19's new features, TypeScript best practices, state management patterns, and common anti-patterns. Review Priority Levels 🚫 Critical (Block Merge) These issues cause bugs, memory leaks, or architectural problems: | Issue | Why It's Critical | |-------|-------------------| | for derived state | Extra render cycle, sync bugs | | Missing cleanup in | Memory leaks | | Direct state mutation ( , ) | Silent update failures | | Conditional hook calls | Breaks Rules of Hooks | | in dynamic lists | State corrupt…