SKILL.md
React Dependency Compatibility Matrix
Minimum versions required for React 18.3.1 and React 19 compatibility.
Use this skill whenever checking whether a dependency supports a target React version, resolving peer dependency conflicts, deciding whether to upgrade or use legacy-peer-deps, or assessing the risk of a react-router v5 to v6 migration.
Review this matrix before running npm install during a React upgrade and before accepting an npm dependency conflict resolution, especially where concurrent mode compatibility may be affected.
Core Upgrade Targets
| Package | React 17 (current) | React 18.3.1 (min) | React 19 (min) | Notes |
|---|---|---|---|---|
react |
17.x | 18.3.1 | 19.0.0 | Pin exactly to 18.3.1 for the R18 orchestra |
react-dom |
17.x | 18.3.1 | 19.0.0 | Must match react version exactly |