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feat: head.startElements support #28

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feat: head.startElements support #28

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14 changes: 12 additions & 2 deletions src/plugins/prerender-plugin.js
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Original file line number Diff line number Diff line change
Expand Up @@ -383,7 +383,7 @@ export function prerenderPlugin({ prerenderScript, renderTarget, additionalPrere
};

/** @type {import('./types.d.ts').Head} */
let head = { lang: '', title: '', elements: new Set() };
let head = { lang: '', title: '', elements: new Set(), startElements: new Set() };

let prerender;
try {
Expand Down Expand Up @@ -435,7 +435,7 @@ export function prerenderPlugin({ prerenderScript, renderTarget, additionalPrere

// Reset HTML doc & head data
const htmlDoc = htmlParse(tpl, { comment: true });
head = { lang: '', title: '', elements: new Set() };
head = { lang: '', title: '', elements: new Set(), startElements: new Set() };

// Add any discovered links to the list of routes to pre-render:
if (result.links) {
Expand Down Expand Up @@ -480,6 +480,16 @@ export function prerenderPlugin({ prerenderScript, renderTarget, additionalPrere
htmlDoc.querySelector('html').setAttribute('lang', enc(head.lang));
}

if (head.startElements) {
// Inject HTML links at the start of <head> for any stylesheets injected during rendering of the page:
htmlHead.insertAdjacentHTML(
'afterbegin',
Array.from(
new Set(Array.from(head.startElements).map(serializeElement)),
).join('\n'),
);
}

if (head.elements) {
// Inject HTML links at the end of <head> for any stylesheets injected during rendering of the page:
htmlHead.insertAdjacentHTML(
Expand Down
7 changes: 7 additions & 0 deletions src/plugins/types.d.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,13 @@ export interface HeadElement {
export interface Head {
lang: string;
title: string;
/**
* Which elements should be injected in the **start** of <head>
*/
startElements: Set<HeadElement>;
/**
* Which elements should be injected in the **end** of <head>
*/
elements: Set<HeadElement>;
}

Expand Down
23 changes: 23 additions & 0 deletions tests/prerender-api.test.js
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Original file line number Diff line number Diff line change
Expand Up @@ -94,6 +94,29 @@ test('Should support `head.title` property', async () => {
assert.match(prerenderedHtml, '<title>My Prerendered Site</title>');
});

test('Should support `head.startElements` property', async () => {
await loadFixture('simple', env);
await writeEntry(
env.tmp.path,
`
export async function prerender() {
return {
html: '<h1>Hello, World!</h1>',
head: {
startElements: new Set([
{ type: 'link', props: { rel: 'stylesheet', href: 'foo.css' } },
]),
},
};
}
`,
);
await viteBuild(env.tmp.path);

const prerenderedHtml = await getOutputFile(env.tmp.path, 'index.html');
assert.match(prerenderedHtml, '<link rel="stylesheet" href="foo.css">');
});

test('Should support `head.elements` property', async () => {
await loadFixture('simple', env);
await writeEntry(env.tmp.path, `
Expand Down