mirror of
https://github.com/dillonkearns/elm-pages-v3-beta.git
synced 2024-11-23 14:15:33 +03:00
Make pagesInit return a Promise
This commit is contained in:
Steven Vandevelde
parent
089bdf894c
commit
5c52dd7850
@ -27,7 +27,7 @@ npm install /path/to/cloned/elm-pages
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# For example, on my machine I can run: npm install ~/src/github.com/dillonkearns/elm-pages
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```
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This adds something like this to your `devDepdnencies`:
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This adds something like this to your `devDependencies`:
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```json
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"elm-pages": "file:../..",
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```
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246
index.js
246
index.js
@ -1,15 +1,25 @@
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const elmPagesVersion = require("./package.json").version;
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module.exports = function pagesInit(
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/** @type { { mainElmModule: { init: any } } } */ { mainElmModule }
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) {
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const initialLocationHash = document.location.hash.replace(/^#/, "");
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let prefetchedPages = [window.location.pathname];
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let prefetchedPages;
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let initialLocationHash;
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document.addEventListener("DOMContentLoaded", function() {
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httpGet(`${window.location.origin}${window.location.pathname}/content.json`, function (/** @type JSON */ contentJson) {
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let app = mainElmModule.init({
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module.exports = function pagesInit(
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/** @type { mainElmModule: { init: any } } */ { mainElmModule }
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) {
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prefetchedPages = [window.location.pathname];
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initialLocationHash = document.location.hash.replace(/^#/, "");
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return new Promise(function(resolve, reject) {
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document.addEventListener("DOMContentLoaded", _ => {
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loadContentAndInitializeApp(mainElmModule).then(resolve, reject);
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});
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})
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};
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function loadContentAndInitializeApp(/** @type { init: any } */ mainElmModule) {
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return httpGet(`${window.location.origin}${window.location.pathname}/content.json`).then(function(/** @type JSON */ contentJson) {
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const app = mainElmModule.init({
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flags: {
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secrets: null,
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isPrerendering: navigator.userAgent.indexOf("Headless") >= 0,
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@ -27,6 +37,7 @@ module.exports = function pagesInit(
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["content", `elm-pages v${elmPagesVersion}`]
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]
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});
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if (navigator.userAgent.indexOf("Headless") >= 0) {
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headTags.forEach(headTag => {
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appendTag(headTag);
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@ -38,113 +49,116 @@ module.exports = function pagesInit(
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document.dispatchEvent(new Event("prerender-trigger"));
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});
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})
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return app
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});
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function setupLinkPrefetching() {
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new MutationObserver(observeFirstRender).observe(document.body, {
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attributes: true,
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childList: true,
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subtree: true
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});
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}
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function loadNamedAnchor() {
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if (initialLocationHash !== "") {
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const namedAnchor = document.querySelector(
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`[name=${initialLocationHash}]`
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);
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namedAnchor && namedAnchor.scrollIntoView();
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}
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}
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function observeFirstRender(
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/** @type {MutationRecord[]} */ mutationList,
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/** @type {MutationObserver} */ firstRenderObserver
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) {
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loadNamedAnchor();
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for (let mutation of mutationList) {
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if (mutation.type === "childList") {
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setupLinkPrefetchingHelp();
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}
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}
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firstRenderObserver.disconnect();
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new MutationObserver(observeUrlChanges).observe(document.body.children[0], {
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attributes: true,
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childList: false,
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subtree: false
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});
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}
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function observeUrlChanges(
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/** @type {MutationRecord[]} */ mutationList,
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/** @type {MutationObserver} */ _theObserver
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) {
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for (let mutation of mutationList) {
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if (
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mutation.type === "attributes" &&
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mutation.attributeName === "data-url"
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) {
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setupLinkPrefetchingHelp();
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}
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}
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}
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function setupLinkPrefetchingHelp(
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/** @type {MutationObserver} */ _mutationList,
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/** @type {MutationObserver} */ _theObserver
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) {
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const links = document.querySelectorAll("a");
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links.forEach(link => {
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// console.log(link.pathname);
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link.addEventListener("mouseenter", function(event) {
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if (
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event &&
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event.target &&
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event.target instanceof HTMLAnchorElement
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) {
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prefetchIfNeeded(event.target);
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} else {
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console.log("Couldn't prefetch with event", event);
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}
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});
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});
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}
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function prefetchIfNeeded(/** @type {HTMLAnchorElement} */ target) {
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if (target.host === window.location.host) {
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if (prefetchedPages.includes(target.pathname)) {
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// console.log("Already preloaded", target.href);
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} else {
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prefetchedPages.push(target.pathname);
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// console.log("Preloading...", target.pathname);
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const link = document.createElement("link");
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link.setAttribute("as", "fetch");
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link.setAttribute("rel", "prefetch");
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link.setAttribute("href", origin + target.pathname + "/content.json");
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document.head.appendChild(link);
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}
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}
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}
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/** @typedef {{ name: string; attributes: string[][]; }} HeadTag */
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function appendTag(/** @type {HeadTag} */ tagDetails) {
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const meta = document.createElement(tagDetails.name);
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tagDetails.attributes.forEach(([name, value]) => {
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meta.setAttribute(name, value);
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});
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document.getElementsByTagName("head")[0].appendChild(meta);
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}
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};
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function httpGet(/** @type string */ theUrl, /** @type Function */ callback)
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{
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var xmlHttp = new XMLHttpRequest();
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xmlHttp.onreadystatechange = function() {
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if (xmlHttp.readyState == 4 && xmlHttp.status == 200)
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callback(JSON.parse(xmlHttp.responseText));
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}
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xmlHttp.open("GET", theUrl, true); // true for asynchronous
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xmlHttp.send(null);
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}
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function setupLinkPrefetching() {
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new MutationObserver(observeFirstRender).observe(document.body, {
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attributes: true,
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childList: true,
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subtree: true
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});
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}
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function loadNamedAnchor() {
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if (initialLocationHash !== "") {
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const namedAnchor = document.querySelector(
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`[name=${initialLocationHash}]`
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);
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namedAnchor && namedAnchor.scrollIntoView();
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}
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}
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function observeFirstRender(
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/** @type {MutationRecord[]} */ mutationList,
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/** @type {MutationObserver} */ firstRenderObserver
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) {
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loadNamedAnchor();
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for (let mutation of mutationList) {
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if (mutation.type === "childList") {
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setupLinkPrefetchingHelp();
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}
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}
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firstRenderObserver.disconnect();
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new MutationObserver(observeUrlChanges).observe(document.body.children[0], {
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attributes: true,
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childList: false,
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subtree: false
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});
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}
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function observeUrlChanges(
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/** @type {MutationRecord[]} */ mutationList,
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/** @type {MutationObserver} */ _theObserver
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) {
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for (let mutation of mutationList) {
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if (
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mutation.type === "attributes" &&
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mutation.attributeName === "data-url"
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) {
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setupLinkPrefetchingHelp();
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}
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}
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}
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function setupLinkPrefetchingHelp(
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/** @type {MutationObserver} */ _mutationList,
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/** @type {MutationObserver} */ _theObserver
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) {
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const links = document.querySelectorAll("a");
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links.forEach(link => {
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// console.log(link.pathname);
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link.addEventListener("mouseenter", function(event) {
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if (
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event &&
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event.target &&
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event.target instanceof HTMLAnchorElement
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) {
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prefetchIfNeeded(event.target);
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} else {
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console.log("Couldn't prefetch with event", event);
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}
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});
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});
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}
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function prefetchIfNeeded(/** @type {HTMLAnchorElement} */ target) {
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if (target.host === window.location.host) {
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if (prefetchedPages.includes(target.pathname)) {
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// console.log("Already preloaded", target.href);
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} else {
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prefetchedPages.push(target.pathname);
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// console.log("Preloading...", target.pathname);
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const link = document.createElement("link");
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link.setAttribute("as", "fetch");
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link.setAttribute("rel", "prefetch");
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link.setAttribute("href", origin + target.pathname + "/content.json");
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document.head.appendChild(link);
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}
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}
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}
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/** @typedef {{ name: string; attributes: string[][]; }} HeadTag */
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function appendTag(/** @type {HeadTag} */ tagDetails) {
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const meta = document.createElement(tagDetails.name);
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tagDetails.attributes.forEach(([name, value]) => {
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meta.setAttribute(name, value);
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});
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document.getElementsByTagName("head")[0].appendChild(meta);
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}
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function httpGet(/** @type string */ theUrl) {
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return new Promise(function(resolve, reject) {
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const xmlHttp = new XMLHttpRequest();
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xmlHttp.onreadystatechange = function() {
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if (xmlHttp.readyState == 4 && xmlHttp.status == 200)
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resolve(JSON.parse(xmlHttp.responseText));
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}
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xmlHttp.onerror = reject;
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xmlHttp.open("GET", theUrl, true); // true for asynchronous
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xmlHttp.send(null);
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})
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}
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