This hook is now called useNavigation to avoid confusion with the recent React hook by the same name. It also no longer has the type field and flattens the submission object into the navigation object itself.

In v1, a thrown Response rendered the closest CatchBoundary while all other unhandled exceptions rendered the ErrorBoundary. In v2 there is no CatchBoundary and all unhandled exceptions will render the ErrorBoundary, response or otherwise.

Like useNavigation, useFetcher has flattened the submission and removed the type field.