Is there a way to attach an event to window?

[dtracers]

I have some custom events that are not attached to any element at all

[hdattada]

I am trying to do the same, attaching an event to window browser.addEventListener('onunload', 'window', (e) => { console.log('browser unloaded') console.log(e) })

and I see the below error, I am not sure if this is the right way

Cannot set property 'removeEventListener' of undefined