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fix: preload main CSS #2486

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Merged
aeneasr merged 2 commits into from
Mar 24, 2026
+45 −0
Merged

fix: preload main CSS #2486

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ffffd42
perf: load main CSS asynchronously to eliminate render-blocking
aeneasr Mar 24, 2026
6f2b9d6
perf: only preload CSS, don't replace stylesheet link
aeneasr Mar 24, 2026
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1 change: 1 addition & 0 deletions docusaurus.config.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -151,6 +151,7 @@ const config: Config = {
// buttonPosition: "center-right",
// },
// ],
"./src/plugins/preload-css",
async function tailwindcss(context, options) {
return {
name: "docusaurus-tailwindcss",
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44 changes: 44 additions & 0 deletions src/plugins/preload-css.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,44 @@
// Copyright © 2026 Ory Corp
// SPDX-License-Identifier: Apache-2.0

const fs = require("fs")
const path = require("path")

module.exports = function preloadCssPlugin() {
return {
name: "preload-css",
async postBuild({ outDir, siteConfig }) {
const cssDir = path.join(outDir, "assets", "css")
if (!fs.existsSync(cssDir)) return

const cssFile = fs.readdirSync(cssDir).find(
(f) => f.startsWith("styles.") && f.endsWith(".css"),
)
if (!cssFile) return

const baseUrl = siteConfig.baseUrl.replace(/\/$/, "")
const href = `${baseUrl}/assets/css/${cssFile}`
const preloadTag = `<link rel="preload" as="style" href="${href}">`

function walk(dir) {
for (const entry of fs.readdirSync(dir, { withFileTypes: true })) {
const full = path.join(dir, entry.name)
if (entry.isDirectory()) {
walk(full)
} else if (entry.name.endsWith(".html")) {
inject(full)
}
}
}

function inject(filePath) {
let html = fs.readFileSync(filePath, "utf8")
if (html.includes(preloadTag)) return
html = html.replace("<head>", `<head>${preloadTag}`)
fs.writeFileSync(filePath, html)
}

walk(outDir)
},
}
}
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