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feat: prefetch in viewport inbound page chunks
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,9 +1,14 @@ | ||
| import { h } from 'vue' | ||
| import { useRoute } from '../router' | ||
| import { usePrefetch } from '../composables/preFetch' | ||
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| export const Content = { | ||
| setup() { | ||
| const route = useRoute() | ||
| if (!__DEV__) { | ||
| // in prod mode, enable intersectionObserver based pre-fetch. | ||
| usePrefetch() | ||
| } | ||
| return () => (route.contentComponent ? h(route.contentComponent) : null) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| // Customized pre-fetch for page chunks based on | ||
| // https://github.com/GoogleChromeLabs/quicklink | ||
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| import { onMounted, onUnmounted, onUpdated } from 'vue' | ||
| import { inBrowser, pathToFile } from '../utils' | ||
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| const hasFetched = new Set<string>() | ||
| const createLink = () => document.createElement('link') | ||
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| const viaDOM = (url: string) => { | ||
| const link = createLink() | ||
| link.rel = `prefetch` | ||
| link.href = url | ||
| document.head.appendChild(link) | ||
| } | ||
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| const viaXHR = (url: string) => { | ||
| const req = new XMLHttpRequest() | ||
| req.open('GET', url, (req.withCredentials = true)) | ||
| req.send() | ||
| } | ||
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| let link | ||
| const doFetch: (url: string) => void = | ||
| inBrowser && | ||
| (link = createLink()) && | ||
| link.relList && | ||
| link.relList.supports && | ||
| link.relList.supports('prefetch') | ||
| ? viaDOM | ||
| : viaXHR | ||
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| export function usePrefetch() { | ||
| if (!inBrowser) { | ||
| return | ||
| } | ||
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| if (!window.IntersectionObserver) { | ||
| return | ||
| } | ||
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| let conn | ||
| if ( | ||
| (conn = (navigator as any).connection) && | ||
| (conn.saveData || /2g/.test(conn.effectiveType)) | ||
| ) { | ||
| // Don't prefetch if using 2G or if Save-Data is enabled. | ||
| return | ||
| } | ||
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| const rIC = (window as any).requestIdleCallback || setTimeout | ||
| let observer: IntersectionObserver | null = null | ||
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| const observeLinks = () => { | ||
| if (observer) { | ||
| observer.disconnect() | ||
| } | ||
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| observer = new IntersectionObserver((entries) => { | ||
| entries.forEach((entry) => { | ||
| if (entry.isIntersecting) { | ||
| const link = entry.target as HTMLAnchorElement | ||
| observer!.unobserve(link) | ||
| const { pathname } = link | ||
| if (!hasFetched.has(pathname)) { | ||
| hasFetched.add(pathname) | ||
| const pageChunkPath = pathToFile(pathname) | ||
| doFetch(pageChunkPath) | ||
| } | ||
| } | ||
| }) | ||
| }) | ||
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| rIC(() => { | ||
| document.querySelectorAll('.vitepress-content a').forEach((link) => { | ||
| if ((link as HTMLAnchorElement).hostname === location.hostname) { | ||
| observer!.observe(link) | ||
| } | ||
| }) | ||
| }) | ||
| } | ||
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| onMounted(observeLinks) | ||
| onUpdated(observeLinks) | ||
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| onUnmounted(() => { | ||
| observer && observer.disconnect() | ||
| }) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,32 @@ | ||
| export const inBrowser = typeof window !== 'undefined' | ||
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| /** | ||
| * Converts a url path to the corresponding js chunk filename. | ||
| */ | ||
| export function pathToFile(path: string): string { | ||
| let pagePath = path.replace(/\.html$/, '') | ||
| if (pagePath.endsWith('/')) { | ||
| pagePath += 'index' | ||
| } | ||
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| if (__DEV__) { | ||
| // awlays force re-fetch content in dev | ||
| pagePath += `.md?t=${Date.now()}` | ||
| } else { | ||
| // in production, each .md file is built into a .md.js file following | ||
| // the path conversion scheme. | ||
| // /foo/bar.html -> ./foo_bar.md | ||
| if (inBrowser) { | ||
| pagePath = pagePath.slice(__BASE__.length).replace(/\//g, '_') + '.md' | ||
| // client production build needs to account for page hash, which is | ||
| // injected directly in the page's html | ||
| const pageHash = __VP_HASH_MAP__[pagePath] | ||
| pagePath = `${__BASE__}_assets/${pagePath}.${pageHash}.js` | ||
| } else { | ||
| // ssr build uses much simpler name mapping | ||
| pagePath = `./${pagePath.slice(1).replace(/\//g, '_')}.md.js` | ||
| } | ||
| } | ||
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| return pagePath | ||
| } |