Property innerWidth does not exist on type EventTarget

If you know what element you registered the event listener on, then you could cast event.target to that element type. I don't think there's any more to say than that. Alternatively, you can directly reference the element you registered the listener on (in this case just the global window) rather than using event.target.

1. A resize event uses the UIEvent Interface.

   https://developer.mozilla.org/en-US/docs/Web/API/Window/resize_event

2. A UIEvent has a target property which, unfortunately, has no "innerWidth" property. So, instead, we assert the target of the event as Window

i.e.

window.addEventListener('resize', (event: UIEvent) => {
  const w = event.target as Window; 
  console.log(w.innerWidth) // works!
});