Can TS get array values?

Question

typescript

const names = ["иван", "антон"]
const fn = (name) => name

How to make it so that only Ivan and Anton can be sent to the function? (the data is in the array)
Or is it impossible in the vehicle?

Answer 1

const names = ["иван", "антон"] as const
const fn = (name: typeof names[0]) => name

https://www.typescriptlang.org/play?#code/MYewdgzg...

Answer 2

const names = [ 'иван', 'антон' ] as const;
type Name = typeof names[number];


const fn = (name: Name) => name;