one/dist/esm/views/PreloadLinks.mjs

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

import { useEffect, useRef } from "react";
import { getURL } from "../getURL.mjs";
import { preloadRoute } from "../router/router.mjs";
const PREFETCH_MODE = process.env.ONE_LINK_PREFETCH || "intent";
function getHrefFromTarget(url, target) {
  if (!(target instanceof HTMLElement)) return null;
  const anchor = target instanceof HTMLAnchorElement ? target : target.closest("a");
  if (!(anchor instanceof HTMLAnchorElement)) return null;
  const href = anchor.getAttribute("href");
  if (!href) return null;
  if (href[0] === "/" || href.startsWith(url)) {
    return href.replace(url, "");
  }
  return null;
}
function PreloadLinks() {
  if (typeof window === "undefined") {
    return null;
  }
  if (!import.meta.env.PROD) {
    useEffect(() => {
      const url = getURL();
      const controller = new AbortController();
      document.addEventListener("mouseover", e => {
        const href = getHrefFromTarget(url, e.target);
        if (href) preloadRoute(href);
      }, {
        passive: true,
        signal: controller.signal
      });
      return () => controller.abort();
    }, []);
    return null;
  }
  if (PREFETCH_MODE === "false") {
    return null;
  }
  const cleanupRef = useRef(null);
  useEffect(() => {
    const url = getURL();
    if (PREFETCH_MODE === "hover") {
      const controller = new AbortController();
      document.addEventListener("mouseover", e => {
        const href = getHrefFromTarget(url, e.target);
        if (href) preloadRoute(href);
      }, {
        passive: true,
        signal: controller.signal
      });
      return () => controller.abort();
    }
    if (PREFETCH_MODE === "viewport") {
      import("../link/prefetchViewport.mjs").then(({
        startPrefetchViewport,
        observePrefetchViewport
      }) => {
        startPrefetchViewport(preloadRoute);
        const cleanups = [];
        const seen = /* @__PURE__ */new WeakSet();
        const observeLinks = () => {
          const links = document.querySelectorAll('a[href^="/"], a[href^="' + url + '"]');
          links.forEach(link => {
            if (seen.has(link)) return;
            seen.add(link);
            const href = link.getAttribute("href");
            if (href) {
              cleanups.push(observePrefetchViewport(link, href.replace(url, "")));
            }
          });
        };
        observeLinks();
        let timeout;
        const observer = new MutationObserver(() => {
          clearTimeout(timeout);
          timeout = setTimeout(observeLinks, 100);
        });
        observer.observe(document.body, {
          childList: true,
          subtree: true
        });
        cleanupRef.current = () => {
          clearTimeout(timeout);
          cleanups.forEach(c => c());
          observer.disconnect();
        };
      });
      return () => cleanupRef.current?.();
    }
    if (PREFETCH_MODE === "intent") {
      const controller = new AbortController();
      import("../link/prefetchIntent.mjs").then(({
        startPrefetchIntent,
        observePrefetchIntent
      }) => {
        startPrefetchIntent(preloadRoute);
        const cleanups = [];
        const seen = /* @__PURE__ */new WeakSet();
        const observeLinks = () => {
          const links = document.querySelectorAll('a[href^="/"], a[href^="' + url + '"]');
          links.forEach(link => {
            if (seen.has(link)) return;
            seen.add(link);
            const href = link.getAttribute("href");
            if (href) {
              cleanups.push(observePrefetchIntent(link, href.replace(url, "")));
            }
          });
        };
        observeLinks();
        let timeout;
        const observer = new MutationObserver(() => {
          clearTimeout(timeout);
          timeout = setTimeout(observeLinks, 100);
        });
        observer.observe(document.body, {
          childList: true,
          subtree: true
        });
        cleanupRef.current = () => {
          clearTimeout(timeout);
          cleanups.forEach(c => c());
          observer.disconnect();
        };
        document.addEventListener("mouseover", e => {
          const href = getHrefFromTarget(url, e.target);
          if (href) preloadRoute(href);
        }, {
          passive: true,
          signal: controller.signal
        });
      });
      return () => {
        controller.abort();
        cleanupRef.current?.();
      };
    }
  }, []);
  return null;
}
export { PreloadLinks };
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