[Roadmap] Milestone 3.0 (TBD)

[Rel1cx]

System Requirements

Minimum supported versions:

• Node.js: 24.8.0
• ESLint: 9.36.0
• TypeScript: 5.9.2

New Rules

• react-x/set-state-in-effect - Validates against calling setState synchronously in an effect, which can lead to re-renders that degrade performance (TBD)
  A fast implementation of set-state-in-effect that doesn't require React Compiler integration
• react-x/set-state-in-render - Validates against setting state during render, which can trigger additional renders and potential infinite render loops (TBD)
  A fast implementation of set-state-in-render that doesn't require React Compiler integration
• react-x/function-component-definition - Enforces the definition of function components (Rel1cx/eslint-react#739)
• react-dom/no-unmount-component-at-node - Replaces usages of ReactDom.unmountComponentAtNode() with root.unmount() (React 19)

Deprecated Rules

• react-hooks-extra/no-direct-set-state-in-use-effect - Replaced by react-x/set-state-in-effect (TBD)