one
Version:
One is a new React Framework that makes Vite serve both native and web.
71 lines (70 loc) • 2.04 kB
JavaScript
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: 0.5
});
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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