dat.GUI don't show options with function variables

[anzakhar]

I'm trying to create an options menu to select the value of a function variable with dat.GUI.

In the 0.7.8 version of dat.GUI this code works - menu items after the 'func' label are displayed enter image description here

but in the newest version (0.7.9) it does not work - menu items after the 'func' label are not displayed enter image description here

Why is that?

function func1() {
  alert('function1');
}

function func2() {
  alert('function2');
}

function init() {
  // setup the control gui
  const controls = new function () {
    this.func = func1;
  };

  const gui = new dat.GUI();

  gui.add(controls, 'func', {
    function1: func1, 
    function2: func2
  })
}