how to listen for events in a global JS window object

Hi, we are successfully login a user using in a form with JS and node with the click of a button, and then trying to wait for an event 'login' message sent to a global JS variable window.EV but we are never receiving the event message and the test enters in a loop and never ends.

const isLoginOk = await page.evaluate(() => {
  return new Promise(function (resolve) {
       window.EV.Event.on(window.EV.Event.LOGIN_SUCCESS, (ev) => {           // <<----------   event is never received, never enters here
          console.log('LOGIN SUCCESS');
          resolve(true);
       });
    });

});

await loginSubmitButon.click();
expect(isLoginOk).toBeTruthy();