Incorrect type on `routeTree.children`

Which project does this relate to?

Router

Describe the bug

routeTree.children has the type RootRouteChildren | undefined

If you type routeTree.children. You get the route key names as options

However in the browser, if you console.log(routeTree.children) you get an array:

I want to be able to generate a navigation by looping over all of the root routs. This gets in the way of that.

Your Example Website or App

https://stackblitz.com/edit/github-bii6hl4v?file=src%2Froutes%2Fabout.tsx

Steps to Reproduce the Bug or Issue

Set up some routes and then try to access the data from routeTree.children

Expected behavior

The actual type for routeTree.children should match the type that TS says it is.

Screenshots or Videos

No response

Platform

• Router / Start Version: 1.121.2
• OS: Windows 11
• Bundler: vite 6.1.0

Additional context

No response

Start with the linked StackBlitz reproduction and its src/routes/about.tsx entry point, then trace how routeTree.children is typed and populated at runtime. Confirm that the declared type matches the observed array so callers can loop over root routes and generate navigation without a type mismatch.