I previously posted about this here, but I don't want to spam that thread.

node_modules/@dnd-kit/core/dist/components/Accessibility/Accessibility.d.ts:9:129 - error TS2503: Cannot find namespace 'JSX'.

9 export declare function Accessibility({ announcements, container, hiddenTextDescribedById, screenReaderInstructions, }: Props): JSX.Element | null;

We basically need s/JSX.Element/React.JSX.Element to fix this. There are two occurrences in this repo itself, for which I will send a PR. Though this requires updating to v18 typings first.

But most of the JSX.Element occurrences seem to come from the build process, which materializes types that were previously not spelled out explicitly.