feat: make typed useRoute(currentRouteName) return children route types as well

[Anoesj]

In an app (with a typed router) where route /a/b is a child of route /a, this makes useRoute('/a') return RouteLocationNormalizedLoadedTyped<RouteNamedMap, "/a"> | RouteLocationNormalizedLoadedTyped<RouteNamedMap, "/a/b">.

It works in a recursive manner, so whenever route /a/b/c is added as a child of /a/b, useRoute('/a') will return RouteLocationNormalizedLoadedTyped<RouteNamedMap, "/a"> | RouteLocationNormalizedLoadedTyped<RouteNamedMap, "/a/b"> | RouteLocationNormalizedLoadedTyped<RouteNamedMap, "/a/b/c">`.

Of course useRoute('/a/b/c') will only return RouteLocationNormalizedLoadedTyped<RouteNamedMap, "/a/b/c">.

Note

This PR is intended to be paired with the following unplugin-vue-router PR: posva/unplugin-vue-router#602
That PR changes the DTS generation to include RouteMeta and a union of the children route's names as generics to every RouteRecordInfo type.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.89%. Comparing base (3753ede) to head (bc9cea2).
Report is 15 commits behind head on main.

Additional details and impacted files

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  Files          34       34           
  Lines        2998     2998           
  Branches      845      845           
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  Hits         2845     2845           
  Misses        150      150           
  Partials        3        3           

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[posva]

I think this is ready!

[posva]

I removed this type param because it was never used and I figured it's safer to add it back later if needed than leaving an unused type param that can eventually be used. I marked this as a fix because the leftover type param should have never been released in the first place