Registers an event listener in the global scope, which will be called synchronously whenever the event `type` is dispatched. ```ts addEventListener('unload', () => { console.log('All finished!'); }); ... dispatchEvent(new Event('unload')); ```

Dispatches an event in the global scope, synchronously invoking any registered event listeners for this event in the appropriate order. Returns false if event is cancelable and at least one of the event handlers which handled this event called Event.preventDefault(). Otherwise it returns true. ```ts dispatchEvent(new Event('unload')); ```

Remove a previously registered event listener from the global scope ```ts const listener = () => { console.log('hello'); }; addEventListener('load', listener); removeEventListener('load', listener); ```