Js is it working and I don't know why

Js not working

console.log(this);

(function(g, $) {

   function MyRealLib(){
      return function(s){
         console.log(s);
         
      };
   }

   g.ML$ = new MyRealLib();

   g.ML$.foo = function(){
       console.log("foo");
   }

}(this, {}))

ML$("hi")
ML$.foo()