Is there a way to create nominal types in TypeScript that extend primitive types?

Question

Say I have two types of numbers that I\'m tracking like latitude and longitude. I would like to represent these variables with the basic num

Answer 1

Based on Lodewijk Bogaards answer

interface Casted extends Number {
  DO_NOT_IMPLEMENT
  toManipulate: { castToNumberType:numberType, thenTo: number } 
}

interface LatitudeNumber extends Casted {
  LatitudeNumber
}

interface LongitudeNumber extends Casted {
  LongitudeNumber
}
type numberType = number | Casted
var lat = 5

function doSomethingStupid(long: LongitudeNumber,lat: LatitudeNumber) {
  var x = long;
  x += 25;
  return { latitude:lat, longitude:x }
}

var a = doSomethingStupid(3.067, lat)

doSomethingStupid(a.longitude,a.latitude)

I think doing the direct cast keeps the intention of a nominal type clear, the numberType Type unfortunately is needed because of a strange design descision where casting to number or Number still won't allow additions. The transpiled javascript is very simple with no boxing:

var lat = 5;

function doSomethingStupid(long, lat) {
    var x = long;
    x += 25;
    return { latitude: lat, longitude: x };
}
var a = doSomethingStupid(3.067, lat);
doSomethingStupid(a.longitude, a.latitude);