PubSub question about unsubscribe

JavaScript
1

I have a DOM Scripting Question. I tried to implement a PubSub pattern on a Drawer Component, As it has many ways to exit a drawer.

The code works, but I’m unsure If should I use unsubscribe method or not. If i should use it, where?

here’s the snippet from my codesandbox

// navbarDrawer.js
import PubSub from 'pubsub-js';

const ON_NAVBAR_DRAWER_CLOSE = 'onNavbarDrawerClose';

function navbarDrawer(
  navbarDrawerSelector = '.js-NavbarDrawer',
  navbarSpacerSelector = '.js-Spacer'
) {
  const NavbarDrawer = document.querySelector(navbarDrawerSelector);
  const Spacer = NavbarDrawer.querySelector(navbarSpacerSelector);

  Spacer.addEventListener('click', () => {
    emitNavbarDrawerOnClose();
  });

  onNavbarDrawerClose(() => {
    closeNavbarDrawer();
  });
}

function onNavbarDrawerClose(func) {
  return PubSub.subscribe(ON_NAVBAR_DRAWER_CLOSE, func);
}

function emitNavbarDrawerOnClose(data = null) {
  PubSub.publish(ON_NAVBAR_DRAWER_CLOSE, null);
}