React18 Dep Compatibility

When you're upgrading to React 18.3.1 or React 19, this gives you the minimum compatible versions for everything in your dependency tree. It covers the obvious ones like testing-library and react-router, plus the less obvious gotchas like Apollo Client needing 3.8+ for useSyncExternalStore and react-redux v7 breaking in concurrent mode. The decision tree for handling peer dependency conflicts is genuinely helpful, and the guidance on when to actually use legacy-peer-deps (sparingly, with documentation) will save you from future pain. Treat this as your preflight checklist before npm install during a React upgrade.

skills.sh installs: 766
GitHub stars: 41K
last updated: Aug 21, 2026

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Install

$ npx -y skills add github/awesome-copilot --skill react18-dep-compatibility --agent claude-code

Installs into .claude/skills of the current project.

Files

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.