one/dist/esm/link/prefetchViewport.native.js

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

function createPrefetchViewport() {
	var done = /* @__PURE__ */ new Set();
	var nodes = /* @__PURE__ */ new Map();
	var io = null;
	var onPrefetch = null;
	function getObserver() {
		if (io) return io;
		io = new IntersectionObserver(function(entries) {
			var _iteratorNormalCompletion = true, _didIteratorError = false, _iteratorError = void 0;
			try {
				for (var _iterator = entries[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
					var entry = _step.value;
					if (!entry.isIntersecting) continue;
					var href = nodes.get(entry.target);
					if (href && !done.has(href)) {
						done.add(href);
						onPrefetch === null || onPrefetch === void 0 ? void 0 : onPrefetch(href);
					}
				}
			} catch (err) {
				_didIteratorError = true;
				_iteratorError = err;
			} finally {
				try {
					if (!_iteratorNormalCompletion && _iterator.return != null) {
						_iterator.return();
					}
				} finally {
					if (_didIteratorError) {
						throw _iteratorError;
					}
				}
			}
		}, { threshold: .5 });
		return io;
	}
	function start(prefetch) {
		onPrefetch = prefetch;
	}
	function observe(el, href) {
		nodes.set(el, href);
		getObserver().observe(el);
		return function() {
			nodes.delete(el);
			io === null || io === void 0 ? void 0 : io.unobserve(el);
			done.delete(href);
		};
	}
	return {
		start,
		observe,
		done,
		nodes
	};
}
var 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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