What is the type of new Set([1, 2, 3])

Issue

I'm new to typescript and I'm trying to see what the type should be for javascripts new Set([1, 2, 3]), but can't find it anywhere.

for example:

const objNums: {[key: string]: number} = {one: 1, two: 2, three: 3};
const arrNums: Array<number> = [1, 2, 3];
const setNums /* : type??? */ = new Set([1, 2, 3]); // ????

// Example usage to explain why I need to assign a type to a variable and am asking what that type is:
function someFn(arg) {
  console.log(arg);
}
someFn(setNums);

Solution

Thanks to @SharedRory.

const setNums: Set<number> = new Set([1, 2, 3]);

If he posts his answer, I'll give him the credit.

Answered By - Fiddle Freak