F-Script vs. JavaScript

I read about F-Script on Ars Technica today and couldn't help wondering how the example might have looked like if written as an ESXX command line application. Something like this, perhaps?

#!/usr/bin/env esxx-js

with (JavaImporter(java.awt, javax.swing)) {
  function main() {
    // Create the window
    let window = new JFrame("TimeSetter");
    window.setLayout(null);
    window.setPreferredSize(new Dimension(383, 175));
    window.setLocation(125, 513);
    window.defaultCloseOperation = WindowConstants.EXIT_ON_CLOSE;

    // Add a button
    let button = new JButton("Push Me");
    button.setBounds(100, 50, 150, 50);
    window.add(button);

    // Set up the two scripts -- one beeps, the other updates the window title
    function beepScript()  { Toolkit.defaultToolkit.beep(); }
    function titleScript() { window.title = new Date(); }

    // When the button is clicked, do something
    button.addActionListener(titleScript);
    window.rootPane.defaultButton = button;

    window.pack();
    window.visible = true;
    esxx.wait(this);
   }
}