Javascript scroll snapping every 100vh without CSS

index.html

<script>
window.addEventListener('scroll', (e) => {
	let scrolled = window.pageYOffset;
	setTimeout(() => {
		if (scrolled == window.pageYOffset) {
			if (
			scrolled % window.innerHeight >=
			window.innerHeight / 2
			) {
				window.scrollBy(
					0,
					window.innerHeight -
					(scrolled % window.innerHeight),
				);
			} else {
				window.scrollBy(
					0,
					-(scrolled % window.innerHeight),
				);
			}
		}
	}, 750);
});
</script>