How can I use the types from the properties of another type

Let’s say I have the following type

type Person = {
  name: string,
  age: number,
  nicknames: string[],
}

And I want to create another type from the types of the properties of the Person type so it ends up like:

 type PersonTypes = string|number|string[]

How can I do that?

I’ve tried with variations of using keyof and typeof but I can’t achieve it.

>Solution :

You can do that like this:

type PersonTypes = Person[keyof Person]

If you want a reusable generic that can be applied to any type, you can do that like this:

type ValueOf<T> = T[keyof T]
type PersonTypes = ValueOf<Person>

Playground link