one/dist/cjs/link/prefetchViewport.js

One is a new React Framework that makes Vite serve both native and web.

var __defProp = Object.defineProperty;
var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
var __getOwnPropNames = Object.getOwnPropertyNames;
var __hasOwnProp = Object.prototype.hasOwnProperty;
var __export = (target, all) => {
  for (var name in all)
    __defProp(target, name, { get: all[name], enumerable: !0 });
}, __copyProps = (to, from, except, desc) => {
  if (from && typeof from == "object" || typeof from == "function")
    for (let key of __getOwnPropNames(from))
      !__hasOwnProp.call(to, key) && key !== except && __defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
  return to;
};
var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: !0 }), mod);
var prefetchViewport_exports = {};
__export(prefetchViewport_exports, {
  createPrefetchViewport: () => createPrefetchViewport,
  observePrefetchViewport: () => observePrefetchViewport,
  startPrefetchViewport: () => startPrefetchViewport
});
module.exports = __toCommonJS(prefetchViewport_exports);
function createPrefetchViewport() {
  const done = /* @__PURE__ */ new Set(), nodes = /* @__PURE__ */ new Map();
  let io = null, onPrefetch = null;
  function getObserver() {
    return io || (io = new IntersectionObserver(
      (entries) => {
        for (const entry of entries) {
          if (!entry.isIntersecting) continue;
          const href = nodes.get(entry.target);
          href && !done.has(href) && (done.add(href), onPrefetch?.(href));
        }
      },
      { threshold: 0.5 }
      // fires when mostly visible
    ), io);
  }
  function start(prefetch) {
    onPrefetch = prefetch;
  }
  function observe(el, href) {
    return nodes.set(el, href), getObserver().observe(el), () => {
      nodes.delete(el), io?.unobserve(el), done.delete(href);
    };
  }
  return { start, observe, done, nodes };
}
let instance = null;
function startPrefetchViewport(prefetch) {
  instance || (instance = createPrefetchViewport()), instance.start(prefetch);
}
function observePrefetchViewport(el, href) {
  return instance || (instance = createPrefetchViewport()), instance.observe(el, href);
}
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