[chuckadams]

Typescript is best when you don't use `class` or `this` at all, but instead return object literals of static closures. In other words, more like this:

    function makeCounter(initial = 0) {
        let count = initial;
        function get() { return count }
        function inc() { count += 1 }
        function dec() { count -= 1 } 
        return {get, inc, dec}
     }

      // works just like a normal object
      const ctr1 = makeCounter(); 
      ctr1.inc()

      // but this works too.  try doing this with a class instance.
      const {get, inc} = makeCounter() 
      inc()

This is the typical style of most VueJS code (though it would replace count with a ref and probably call the function `useCounter`). TypeScript is smart enough that it can infer interfaces and even classes from such literals should you go that way, full support for substitutability checking and all.