function Foo():Foo; // error
function Foo(s:string):Foo; // error
class Foo { // error
    bar1() { /*WScript.Echo("bar1");*/ }
    constructor(x: any) {
        // WScript.Echo("Constructor function has executed");
    }
}
//class Foo(s: String);

var f1 = new Foo("hey");


f1.bar1();
Foo();
Foo("s");