Can AutoPath hint with the top level properties?

[timkinnane]

I have a usage of AutoPath where it would be very helpful for developer experience to provide hinting at the top level for a path argument. Currently it seems to only start hinting after the dot, at 2nd tier depth. e.g...

type Data = {
  foo: { one: any, two: any }
  bar: { one: any, two: any }
}

With an object of above Data type, hinting path argument will work for foo. and present foo.one, foo.two but it would be great if it would first hint foo, bar without any input.

I tried combining a basic utility type to join the top level keys with the AutoPath type as below, but it broke all the hinting:

type StringKeys<T> = Extract<keyof T, string>

function atPath <T extends object, P extends string> (obj: T, path: StringKeys<T> | AutoPath<T, P> {
   // ...
}

[timkinnane]

Wow, okay. I tried a bunch of ideas before making this post, but I did think of one last thing immediately after posting and it seems to work quite well actually. Just needed to also bring in the List.Length type..

type IsPath<P extends string> = Length<Split<P, '.'>> extends 1 ? false : true

type StringKeys<T> = Extract<keyof T, string>

type PathOf<T, P extends string> = IsPath<P> extends false
  ? StringKeys<T>
  : AutoPath<T, P>

Using the type from my first example, an function argument of PathOf<Data, P> will hint foo and bar without input, but adding a dot will switch it into regular AutoPath hinting.