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import { isFilledString } from "../../shared/util.ts";import events from "./events.ts";import { matchRoutes, type Router } from "./router.ts";
let router: Router | null = null;let preRedirect: URL | null = null;
const onrouter = (e: Record<string, unknown>) => {  events.off("router", onrouter);  if (preRedirect) {    events.emit("popstate", { type: "popstate", url: preRedirect });    preRedirect = null;  }  router = e.router as Router;};events.on("router", onrouter);
export function redirect(href: string, replace?: boolean) {  const { history, location } = globalThis;  if (!isFilledString(href) || !history || !location) {    return;  }
  if (href.startsWith("file://") || href.startsWith("mailto:") || href.startsWith("data:")) {    location.href = href;    return;  }
  const url = new URL(href, location.href);  if (url.href === location.href) {    return;  }  if (url.host !== location.host) {    location.href = href;    return;  }
  if (replace) {    history.replaceState(null, "", url);  } else {    history.pushState(null, "", url);  }
  if (router) {    if (!Reflect.has(globalThis, "navigation")) {      events.emit("popstate", { type: "popstate", url });    }  } else {    preRedirect = url;  }}
const prefetched = new Set<string>();
/** prefetch module using `<link rel="modulepreload" href="...">` */export const prefetchModule = (url: URL) => {  if (prefetched.has(url.href)) {    return;  }  prefetched.add(url.href);  if (!router) {    throw new Error("router is not ready.");  }  const deploymentId = window.document.body.getAttribute("data-deployment-id");  const q = deploymentId ? `?v=${deploymentId}` : "";  const matches = matchRoutes(url, router);  matches.map(([_, meta]) => {    if (!document.querySelector(`link[data-module-id="${meta.filename}"]`)) {      const link = document.createElement("link");      link.setAttribute("rel", "modulepreload");      link.setAttribute("href", meta.filename.slice(1) + q);      link.setAttribute("data-module-id", meta.filename);      document.head.appendChild(link);    }  });};