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React 19+ · Concept

Rules of Hooks

Call ordinary React Hooks only at the top level of function components and custom Hooks. Keep their order unchanged across renders, and place them before early returns.

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Syntax

useState(initialState); useContext(context); useEffect(setup, dependencies);

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  • Rules of React
  • Components and Hooks must be pure
  • use
  • eslint-plugin-react-hooks rules-of-hooks

Source: Rules of Hooks – React API Reference. Checked 2026-11-03.