@CHE1RON I was trying to replicate the problem but I was unable to. Can you confirm it is not caused by https://react.dev/blog/2024/04/25/react-19-upgrade-guide#ref-cleanup-required ?

thanks for letting me know, I'll confirm that and get back to you!

Same problem here. Had to cast :(

const containerElementRef = useRef<HTMLDivElement>(null)
const isHovering = useHover(containerElementRef as RefObject<HTMLDivElement>)
//                                              ^ 😭 

Yeah, me too, casting always feels like you were given typesafety candy and then having to give it back ..

Same problem here. Had to cast :(

const containerElementRef = useRef<HTMLDivElement>(null)
const isHovering = useHover(containerElementRef as RefObject<HTMLDivElement>)
//                                              ^ 😭 

I'd sooner annotate with @ts-expect-error so the cast can be removed once the type error is resolved.

const containerElementRef = useRef<HTMLDivElement>(null)
// @ts-expect-error React 19 type compatibility, nullable ref can be ignored.
const isHovering = useHover(containerElementRef)

encountered the same problem with useResizeObserver. also outlined e.g. here: ZeeCoder/use-resize-observer#108

Same happens for useOnClickOutside.

I created a PR: #665. Probably solves #650, too.