I've written code like this so many times:

onMounted(()=> {
  checkFit();
  window.addEventListener('resize', checkFit);
});

onUnmounted(()=> {
  window.removeEventListener('resize', checkFit);
});

I know that this isn't much code, but I seen a lot of times that people forget the onUnmounted step

I would love a shortcut like this that only runs client side, onMounted and after resize:

onWindowResize(() => checkFit())

(there can probably be a better name that reflects that it's onMounted also, but I can't think of any)