React Hook “useState” is called in function “app” which is neither a React function component or a custom React Hook function

Question

I\'m trying to use react hooks for a simple problem

const [personState,setPersonState] = useState({ DefinedObject });

with following depend

Answer 1

The solution, as Yuki already pointed, is to capitalize the component name. It's important to note that not only the "default" App component needs to be capitalized, but all components:

const Person = () => {return ...};

export default Person;

This is due to eslint-plugin-react-hooks package, specifically isComponentName() function inside RulesOfHooks.js script.

Official explanation from Hooks FAQs:

We provide an ESLint plugin that enforces rules of Hooks to avoid bugs. It assumes that any function starting with ”use” and a capital letter right after it is a Hook. We recognize this heuristic isn’t perfect and there may be some false positives, but without an ecosystem-wide convention there is just no way to make Hooks work well — and longer names will discourage people from either adopting Hooks or following the convention.