typeof

const person = {
  name: "Max", 
  age: 22 
} as const 
 
//type personType = (typeof person)[keyof typeof person]
type personType = typeof person

In this case, personType is now "Max" | 22

const person = {
  name: "Max", 
  age: 22 
} as const 
 
type personType = (typeof person)[keyof typeof person]