shift73k/assets/js/_hamburger-helper.js

const togglerBtn = document.getElementById('navbarSupportedContentToggler');
const navbarContent = document.getElementById('navbarSupportedContent');

if (navbarContent != null) {
  navbarContent.addEventListener('show.bs.collapse', () => {
    console.log('opening navbar content');
    togglerBtn.classList.toggle('is-active');
  });
  
  navbarContent.addEventListener('hide.bs.collapse', () => {
    console.log('closing navbar content');
    togglerBtn.classList.toggle('is-active');
  });
}