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docs: switch to dropcss in AMP example #10546

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merged 10 commits into from
Aug 23, 2023
Merged

docs: switch to dropcss in AMP example #10546

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ac3e0ad
fix: switch to dropcss
ghostdevv Aug 12, 2023
acf9255
fix: use buffer
ghostdevv Aug 12, 2023
7e68c71
fix: cleanup
ghostdevv Aug 12, 2023
323d528
play it safe
ghostdevv Aug 12, 2023
4ccca14
docs: add note about adding amp to html
ghostdevv Aug 12, 2023
930273d
docs: add dropcss note
ghostdevv Aug 12, 2023
052d5cd
Merge remote-tracking branch 'upstream/master' into amp-purify-css
ghostdevv Aug 12, 2023
b614da2
fix: tabs
ghostdevv Aug 12, 2023
0fd9493
Update documentation/docs/40-best-practices/20-seo.md
ghostdevv Aug 12, 2023
50f46cc
Update documentation/docs/40-best-practices/20-seo.md
dummdidumm Aug 23, 2023
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47 changes: 45 additions & 2 deletions documentation/docs/40-best-practices/20-seo.md
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Original file line number Diff line number Diff line change
Expand Up @@ -106,21 +106,64 @@ export default config;
export const csr = false;
```

...adding `amp` to your `app.html`

```html
<html amp>
...
```

...and transforming the HTML using `transformPageChunk` along with `transform` imported from `@sveltejs/amp`:

```js
/// file: src/hooks.server.js
import * as amp from '@sveltejs/amp';

/** @type {import('@sveltejs/kit').Handle} */
export async function handle({ event, resolve }) {
let buffer = '';
return resolve(event, {
return await resolve(event, {
transformPageChunk: ({ html, done }) => {
buffer += html;
if (done) return amp.transform(html);
if (done) return amp.transform(buffer);
}
});
}
```

To prevent shipping any unused CSS as a result of transforming the page to amp, we can use [`dropcss`](https://www.npmjs.com/package/dropcss):

```js
/// file: src/hooks.server.js
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// @errors: 2307
import * as amp from '@sveltejs/amp';
import dropcss from 'dropcss';

/** @type {import('@sveltejs/kit').Handle} */
export async function handle({ event, resolve }) {
let buffer = '';

return await resolve(event, {
transformPageChunk: ({ html, done }) => {
buffer += html;

if (done) {
let css = '';
const markup = amp
.transform(buffer)
.replace('⚡', 'amp') // dropcss can't handle this character
.replace(/<style amp-custom([^>]*?)>([^]+?)<\/style>/, (match, attributes, contents) => {
css = contents;
return `<style amp-custom${attributes}></style>`;
});

css = dropcss({ css, html: markup }).css;
return markup.replace('</style>', `${css}</style>`);
}
}
});
}

```

> It's a good idea to use the `handle` hook to validate the transformed HTML using `amphtml-validator`, but only if you're prerendering pages since it's very slow.
2 changes: 1 addition & 1 deletion packages/kit/test/apps/amp/package.json
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Expand Up @@ -15,7 +15,7 @@
"@sveltejs/amp": "workspace:^",
"@sveltejs/kit": "workspace:^",
"cross-env": "^7.0.3",
"purify-css": "^1.2.5",
"dropcss": "^1.0.16",
"svelte": "^4.0.5",
"svelte-check": "^3.4.4",
"typescript": "^4.9.4",
Expand Down
14 changes: 14 additions & 0 deletions packages/kit/test/apps/amp/src/app.d.ts
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Original file line number Diff line number Diff line change
@@ -1 +1,15 @@
/// <reference types="@sveltejs/kit" />

declare module 'dropcss' {
interface Options {
html: string;
css: string;

shouldDrop?: (selector: string) => boolean;
didRetain?: (selector: string) => void;

keepText?: boolean;
}

export default function dropcss(options: Options): { css: string };
}
2 changes: 1 addition & 1 deletion packages/kit/test/apps/amp/src/app.html
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
<!DOCTYPE html>
<html ⚡ lang="en">
<html lang="en" amp>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width" />
Expand Down
21 changes: 8 additions & 13 deletions packages/kit/test/apps/amp/src/hooks.server.js
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Original file line number Diff line number Diff line change
@@ -1,32 +1,27 @@
import purify from 'purify-css';
import * as amp from '@sveltejs/amp';
import dropcss from 'dropcss';

/** @type {import('@sveltejs/kit').Handle} */
export async function handle({ event, resolve }) {
let buffer = '';

const response = await resolve(event, {
return await resolve(event, {
transformPageChunk: ({ html, done }) => {
buffer += html;

if (done) {
const html = amp.transform(buffer);

// remove unused CSS
let css = '';
const markup = html.replace(
/<style amp-custom([^>]*?)>([^]+?)<\/style>/,
(match, attributes, contents) => {
const markup = amp
.transform(buffer)
.replace('⚡', 'amp')
.replace(/<style amp-custom([^>]*?)>([^]+?)<\/style>/, (match, attributes, contents) => {
css = contents;
return `<style amp-custom${attributes}></style>`;
}
);
});

css = purify(markup, css);
css = dropcss({ css, html: markup }).css;
return markup.replace('</style>', `${css}</style>`);
}
}
});

return response;
}
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