Union type for nested states in v5

[schliemannw]

Hi, all.
I'm currently migrating from v4 and one thing I do a lot in my application to interact with XState is to generate union types for states in the machine. For instance, having a schema such as:

type Schema  = {
  states: {
    first: {}
    second: {
      states: {
        one: {}
        two: {}
      }
    }
  }
}

I could get an union type for second state that would be 'one' | 'two' by doing:

type SecondState = keyof Schema['states']['second']['states']

In v5 it seems you can't define schemas so I was wondering if there is any other way to derive these union types?

Thank you!