There seems to be a regression in version 7.30.0. Functions like these are now treated like components and trigger the react/display-name rule:

export const demo = (a?: string) => (b?: string) => { if (a == null) return null; return b; } 

I understand that it might be hard to separate function components from regular functions, but aren't React components always capitalized? Couldn't that be a way to identify them?

This wasn't a problem in version 7.29.4 of eslint-plugin-react.

eslint@8.15.0
eslint-plugin-react@7.30.0