Can we make the handle property of RouteObject an interface?

[MWhite-22]

We use react-router in "data-loader" mode today and leverage the handle prop from RouteObject to define breadcrumbs.

Today I have to override a lot of types to get the handle prop to be strictly defined (from it's default any) but if the library referenced a interface Handle {} type then I could override it using declaration merging in my application and have that type be properly consumed everywhere.

Any interest in allowing this? Happy to contribute if you are open to it.

On a side note: I do fear slightly you want to move away from the handle prop as it's mentioned less and less in the v7 docs. I personally love it, but just want to make sure if thats the direction the library is considering then I don't want to tie our logic in to it too deeply if we can avoid it.

[brophdawg11]

I think generally we've avoided this because handles are route-specific so a single shared Handle interface feels like a bit of a footgun because you either have to (1) make every Handle field optional or (2) make sure every single route always defines all the Handle fields - otherwise your types will be lying to you. Both of those feels like easy things to overlook.