one/dist/esm/link/prefetchViewport.mjs

One is a React framework for web, iOS, and Android apps.

function createPrefetchViewport() {
	const done = /* @__PURE__ */ new Set();
	const nodes = /* @__PURE__ */ new Map();
	let io = null;
	let onPrefetch = null;
	function getObserver() {
		if (io) return io;
		io = new IntersectionObserver((entries) => {
			for (const entry of entries) {
				if (!entry.isIntersecting) continue;
				const href = nodes.get(entry.target);
				if (href && !done.has(href)) {
					done.add(href);
					onPrefetch?.(href);
				}
			}
		}, { threshold: .5 });
		return io;
	}
	function start(prefetch) {
		onPrefetch = prefetch;
	}
	function observe(el, href) {
		nodes.set(el, href);
		getObserver().observe(el);
		return () => {
			nodes.delete(el);
			io?.unobserve(el);
			done.delete(href);
		};
	}
	return {
		start,
		observe,
		done,
		nodes
	};
}
let instance = null;
function startPrefetchViewport(prefetch) {
	if (!instance) instance = createPrefetchViewport();
	instance.start(prefetch);
}
function observePrefetchViewport(el, href) {
	if (!instance) instance = createPrefetchViewport();
	return instance.observe(el, href);
}

export { createPrefetchViewport, observePrefetchViewport, startPrefetchViewport };
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