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brillout committed May 11, 2024
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4 changes: 2 additions & 2 deletions docs/components/ViteLazyTranspilingContradiction.tsx
Original file line number Diff line number Diff line change
Expand Up @@ -7,8 +7,8 @@ import React from 'react'
function ViteLazyTranspilingContradiction() {
return (
<>
contradicts <Link href="/lazy-transpiling">Vite's lazy-transpiling approach</Link> and, therefore, significantly
slows down development speed
contradicts <Link href="/lazy-transpiling">Vite's lazy-transpiling approach</Link> and it would, therefore,
significantly slow down development speed
</>
)
}
2 changes: 1 addition & 1 deletion docs/pages/config/+Page.mdx
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Expand Up @@ -198,7 +198,7 @@ export default {
}
```

This enables Vike to load the file `/pages/+config.js` without having to load `LayoutDefault.jsx`. Vike can quickly load all your `+config.js` files, without having to load any runtime code.
This enables Vike to load the file `/pages/+config.js` without having to load `LayoutDefault.jsx`. This means that Vike can quickly load all your `+config.js` files without having to load any runtime code.

> These fake imports, which we call *pointer imports*, apply only to `+config.js` files. Imports in other `+` files are normal imports as usual.
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18 changes: 15 additions & 3 deletions docs/pages/prefetchStaticAssets/+Page.mdx
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Expand Up @@ -10,8 +10,6 @@ export default {
}
```

> The `prefetchStaticAssets` setting requires <Link href="/client-routing">Client Routing</Link>.
By default,
the static assets of `/some-url` are loaded as soon as the user hovers his mouse over a link `<a href="/some-url">`.
This means that static assets are often already loaded before even the user clicks on the link.
Expand All @@ -34,10 +32,12 @@ export default {
}
```

> Viewport prefetching is disabled in development. (Because preloading pages <ViteLazyTranspilingContradiction />.)
> Viewport prefetching is disabled in development. (Because preloading pages that eargly <ViteLazyTranspilingContradiction />.)
> Only static assets are prefetched: the `pageContext` of pages isn't prefetched, see [#246](https://github.com/vikejs/vike/issues/246).
> The `prefetchStaticAssets` setting requires <Link href="/client-routing">Client Routing</Link>.

## Override for individual links

Expand All @@ -57,18 +57,30 @@ You can programmatically call <code>prefetch('/some/url')</code>, see <Link href
You can viewport prefetch for mobile users while only hover prefetch for desktop users:

```js
// /pages/+prefetchStaticAssets.js

// For small screens, such as mobile, viewport prefetching can be a sensible strategy
export const prefetchStaticAssets =
window.matchMedia('(max-width: 600px)').matches ? 'viewport' : 'hover'
```

```js
// /pages/+prefetchStaticAssets.js

// Or we enable viewport prefetching for any device without a mouse: mobile and tablets (but
// not laptops that have a touch display).
export const prefetchStaticAssets =
window.matchMedia('(any-hover: none)').matches ? 'viewport' : 'hover'
```

> Make sure to define such dynamic/runtime code in a `+prefetchStaticAssets.js` file.
>
> (Don't define it inside a `+config.js` file because `window.matchMedia()` only exists in the browser and it would <Link href="/config#pointer-imports">prevent Vike from loading `+config.js` files</Link>.)
See also:
- [MDN > Web API > Window > matchMedia()](https://developer.mozilla.org/en-US/docs/Web/API/Window/matchMedia)
- [Stack Overflow > Detecting that the browser has no mouse and is touch-only](https://stackoverflow.com/questions/7838680/detecting-that-the-browser-has-no-mouse-and-is-touch-only/52854585#52854585)

## See also

- <Link href="/preloading" />
21 changes: 15 additions & 6 deletions docs/pages/preloading/+Page.mdx
Original file line number Diff line number Diff line change
@@ -1,10 +1,17 @@
import { Link } from '@brillout/docpress'

> **What is preloading?** Preloading denotes the practice of loading assets (JavaScript, CSS, images, etc.) before the browser discovers them in HTML/CSS/JavaScript code. That way we reduce the network round trips required before the browser starts discovering and loading all dependencies.
> **What is preloading?** Preloading denotes the practice of loading assets (JavaScript, CSS, images, etc.) before the browser discovers them in HTML/CSS/JavaScript code. That way you can reduce the network round trips required before the browser starts discovering and loading all dependencies.
By default, Vike automatically inject tags to our HTML, such as `<script type="module" src="script.js">`, `<link rel="stylesheet" type="text/css" href="style.css">`, and `<link rel="preload" href="font.ttf" as="font" type="font/ttf">`. It does so using a preload strategy that works for most users, but we can use `injectFilter()` to implement a custom preload strategy.
By default, Vike automatically inject tags to your HTML such as:
- `<script type="module" src="script.js">`
- `<link rel="stylesheet" type="text/css" href="style.css">`
- `<link rel="preload" href="font.ttf" as="font" type="font/ttf">`

To improve preloading performance, we can use [Early Hints](https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/103) which Vike automatically generates.
It does so using a preload strategy that works for most users, but you can use <Link href="#injectfilter" /> to implement a custom preload strategy.

To improve preloading performance, you can use <Link href="#early-hints" /> which Vike automatically generates.

> See also <Link href="/prefetchStaticAssets" />.

## Early Hints
Expand All @@ -28,8 +35,9 @@ app.get('*', async (req, res) => {
type PageContext = {
httpResponse: {
earlyHints: {
earlyHintLink: string, // Header Line for the Early Hint Header
assetType: "image" | "script" | "font" | "style" | "audio" | "video" | "document" | "fetch" | "track" | "worker" | "embed" | "object" | null
earlyHintLink: string // Header Line for the Early Hint Header
assetType: "image" | "script" | "font" | "style" | "audio" | "video" | "document" |
"fetch" | "track" | "worker" | "embed" | "object" | null
mediaType: string // MIME type
src: string // Asset's URL
isEntry: boolean // true ⇒ asset is an entry
Expand All @@ -49,7 +57,7 @@ See also:
## `injectFilter()`
If Vike's default preload strategy doesn't work for us, we can customize which and where preload/asset tags are injected.
If Vike's default preload strategy doesn't work for you, you can customize which and where preload/asset tags are injected.
```ts
// /renderer/+onRenderHtml.js
Expand Down Expand Up @@ -92,5 +100,6 @@ By using <Link href="/getGlobalContext">`getGlobalContextSync()` or `getGlobalCo
## See also

- <Link href="/injectFilter" />
- <Link href="/prefetchStaticAssets" />
- <Link href="/streaming" />
- <Link href="/getGlobalContext" />

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