definePage lacks generics: how to redirect to a children using the current page params?

[darkbasic]

For the detailed view of a certain item (/items/[id]) I have a tabbed view (/items/[id]/a, /items/[id]/b...).
One of the tabs must be the default one, so /items/[id] should redirect to it.

The easiest solution would be something like:

definePage({
  redirect: (to) => removeTrailingSlashes(to.path).concat('/a'),

but I don't like it because it's not type safe.

Another solution would be the following:

// eslint-disable-next-line @typescript-eslint/no-unused-vars -- needed for the typings
const route = useRoute<'/items/[id]'>()

definePage({
  redirect: (to) => ({
    name: '/itmes/[id]/a',
    // eslint-disable-next-line @typescript-eslint/no-unsafe-type-assertion -- we know where we are
    params: { id: (to as typeof route).params.id }
  })
})

Somehow I couldn't find a way to set the correct typings for the current route for to in redirect because definePage doesn't have a generic (like definePage<'/items/[id]'>). Am I doing something wrong?