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feat: embed main CSS inline instead of preloading #2487

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Merged
aeneasr merged 3 commits into from
Mar 25, 2026
Merged

feat: embed main CSS inline instead of preloading #2487

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4b4227c
feat: embed main CSS inline instead of preloading
aeneasr Mar 25, 2026
bcec547
fix: use cheerio DOM parsing to reliably remove stylesheet link
aeneasr Mar 25, 2026
c959a79
fix: replace cheerio with regex for CSS link removal
aeneasr Mar 25, 2026
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19 changes: 11 additions & 8 deletions src/plugins/preload-css.js
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Original file line number Diff line number Diff line change
Expand Up @@ -4,10 +4,10 @@
const fs = require("fs")
const path = require("path")

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

Expand All @@ -16,9 +16,7 @@ module.exports = function preloadCssPlugin() {
)
if (!cssFile) return

const baseUrl = siteConfig.baseUrl.replace(/\/$/, "")
const href = `${baseUrl}/assets/css/${cssFile}`
const preloadTag = `<link rel="preload" as="style" href="${href}">`
const cssContent = fs.readFileSync(path.join(cssDir, cssFile), "utf8")

function walk(dir) {
for (const entry of fs.readdirSync(dir, { withFileTypes: true })) {
Expand All @@ -33,8 +31,13 @@ module.exports = function preloadCssPlugin() {

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

if (!html.includes(cssFile)) return

html = html.replace(
/<link\b[^>]*\bhref="[^"]*styles\.[^"]*\.css"[^>]*>/i,
`<style>${cssContent}</style>`,
)
fs.writeFileSync(filePath, html)
}

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