For array types, I don't think there's a way. You can type x as a tuple like this: const x: [number, number] = [1, 2]; In which case you'll only be able t

For array types, I don't think there's a way. You can type x as a tuple like this: const x: [number, number] = [1, 2]; In which case you'll only be able to access indices zero and one.