useOnResize: update width & height when mounted

[vmihailenco]

Currently width and height are not updated until window is resized (which may not happen at all). What do you think about using onMounted to set initial width & height, e.g. add something similar to

vue-composable/packages/vue-composable/src/event/onResize.ts

Lines 39 to 40 in 36c8b57

	const height = ref(element.value && element.value.clientHeight);
	const width = ref(element.value && element.value.clientWidth);

if (!element.value) {
  onMounted(handler)
}

What do you think?

[pikax]

Makes sense, it should wait for mount if you passing a ref