Modern React (19.x) Complete Guide

This skill covers React 19.0 through 19.2. It is structured so an LLM can quickly identify what pattern to use, what to avoid, and how to migrate legacy code. Every section follows: what it is → DO this → DON'T do that → migration path.

Table of Contents

1. Critical DO / DON'T Quick Reference
2. Migration Mapping Table
3. New Hooks Deep Dive
4. Actions and Forms
5. React 19.2 Features
6. Server Components
7. Server Component DO / DON'T
8. Complete Migration Examples
9. Common Anti-Patterns to Fix
10. Codemod Commands
11. Breaking Changes
12. Migration Checklist
13. Quick Reference Card