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* vite-plugin-static-pages
*
* Emits the (very large) set of pre-rendered "static" HTML pages —
* news articles, news/index_*.html, sitemap_*.html, and
* political-intelligence_*.html — into `dist/` *outside* Rollup's
* module graph.
*
* ## Why this exists
*
* These pages are produced by the prebuild scripts (render-articles,
* generate-news-indexes, generate-sitemap-html, generate-political-
* intelligence). They are **pure static HTML**: they reference
* `styles.css` via a relative path (`styles.css` from the project
* root, `../styles.css` from the `news/` subfolder), inline a tiny
* theme-init `<script>`, and embed JSON-LD — but they have **no
* `<script type="module">`**, no Vite-resolvable imports, and no
* other bundle-able assets.
*
* Listing them as `rollupOptions.input` previously forced Rollup to
* add ~3 540 entries (3 497 news articles + 14 PI pages + 14
* sitemaps + 14 news index pages) into the module graph just to
* rewrite a single `styles.css` `<link>` tag in each. At ~4 250
* modules the `rendering chunks` phase exhausted Node's default
* ~4 GB heap, causing
* `FATAL ERROR: Ineffective mark-compacts near heap limit
* Allocation failed - JavaScript heap out of memory`
* (release run 25133177267, build log line "rendering chunks…").
*
* Bumping `--max-old-space-size` to 8 GB (PR #2117) only delayed
* the failure — every additional day of news content brings the
* limit back. The root cause is that Rollup is the wrong tool for
* static page emission.
*
* ## What this plugin does
*
* Runs in `closeBundle` (after Vite/Rollup have finished writing
* the real bundled outputs):
*
* 1. Reads `dist/.vite/manifest.json` to find the hashed bundle
* name for `styles.css` (e.g. `assets/styles-AbCdEf12.css`).
* 2. Computes the SHA-384 SRI hash of that bundled stylesheet so
* we can attach `integrity="sha384-…" crossorigin="anonymous"`
* to the rewritten `<link rel="stylesheet">` — preserving the
* behaviour of `vite-plugin-sri-gen` for the pages we no longer
* route through Vite.
* 3. Reads each static HTML page from the project root, performs
* a single regex rewrite of the `styles.css` `<link>` tag, and
* writes the result into the matching `dist/` location. No DOM
* parsing, no full corpus held in memory at once.
*
* Memory profile: O(largest single HTML file) ≈ 2 MB worst case
* (political-intelligence_*.html). Time profile: O(n) on the
* number of static pages, with synchronous fs writes pipelined by
* the OS page cache. Both dimensions are dwarfed by Vite's normal
* cost.
*
* ## Trust boundary
*
* The pages this plugin emits are entirely produced by the
* repository's own prebuild scripts (no third-party templates) and
* served from the same S3 bucket / CloudFront distribution as the
* bundled CSS. The "trust S3 / CloudFront" classification in
* `vite.config.js` (SRI dropped for first-party JS) applies here
* too: we add SRI to the CSS link as a defence-in-depth measure
* but no other resources need integrity attributes.
*
* @author Hack23 AB
* @license Apache-2.0
*/
import crypto from 'node:crypto';
import fs from 'node:fs';
import path from 'node:path';
/**
* @typedef {Object} StaticPageSource
* @property {string} path Path relative to the project root.
* @property {boolean} [recurse] When `path` is a directory, also
* walk subdirectories. Defaults to false.
*/
/**
* @typedef {Object} StaticPageSet
* @property {string} label Human-readable label for the build summary.
* @property {ReadonlyArray<StaticPageSource>} sources
*/
/**
* Match a single `<link rel="stylesheet" … href="…styles.css">`
* tag and capture the surrounding attributes so we can splice in
* `integrity` / `crossorigin` without disturbing the rest.
*
* The literal `styles.css` lives in three accepted forms:
* - `styles.css` (root-level pages)
* - `../styles.css` (one-level subfolders, e.g. news/)
* - `/styles.css` (absolute, never used today but tolerated)
*/
const STYLESHEET_LINK_RE =
/<link\b([^>]*?)\brel\s*=\s*"stylesheet"([^>]*?)\bhref\s*=\s*"((?:\.\.\/|\/)?styles\.css)"([^>]*)>/gi;
/**
* Read Vite's emitted manifest to map `styles.css` → its hashed
* output path. Falls back to scanning `dist/assets/` for a unique
* `styles-*.css` if the manifest entry is missing (which can
* happen when CSS is registered only under an HTML entry).
*
* @param {string} distDir Absolute path to the Vite output dir.
* @returns {string} Hashed asset path relative to `distDir`
* (e.g. `assets/styles-Ab12.css`).
*/
function readStylesAssetName(distDir) {
const manifestPath = path.join(distDir, '.vite', 'manifest.json');
Eif (fs.existsSync(manifestPath)) {
/** @type {Record<string, { file?: string }>} */
const manifest = JSON.parse(fs.readFileSync(manifestPath, 'utf8'));
const entry = manifest['styles.css'];
if (entry && entry.file && entry.file.endsWith('.css')) return entry.file;
}
// Fallback — scan dist/assets/ for the unique hashed `styles-*.css`.
const assetsDir = path.join(distDir, 'assets');
Eif (fs.existsSync(assetsDir)) {
const hits = fs
.readdirSync(assetsDir)
.filter((f) => /^styles-[A-Za-z0-9_-]+\.css$/.test(f));
if (hits.length === 1) return `assets/${hits[0]}`;
Iif (hits.length > 1) {
throw new Error(
`[static-pages] Found multiple styles-*.css in dist/assets/ ` +
`(${hits.join(', ')}). Cannot determine canonical bundle.`,
);
}
}
throw new Error(
`[static-pages] Could not resolve hashed styles.css filename. ` +
`Set build.manifest = true in vite.config.js, or check that ` +
`the main bundle build emitted a styles-*.css under dist/assets/.`,
);
}
function sha384Base64(buffer) {
return crypto.createHash('sha384').update(buffer).digest('base64');
}
/**
* Walk a {@link StaticPageSet} and resolve absolute paths for
* every HTML file it covers.
*
* @param {StaticPageSet} set
* @param {string} projectRoot
* @returns {string[]} absolute paths
*/
function resolvePageFiles(set, projectRoot) {
const files = [];
for (const src of set.sources) {
const abs = path.join(projectRoot, src.path);
if (!fs.existsSync(abs)) continue;
const stat = fs.statSync(abs);
if (stat.isFile() && abs.endsWith('.html')) {
files.push(abs);
continue;
}
Eif (stat.isDirectory()) {
const entries = fs.readdirSync(abs, { withFileTypes: true });
for (const e of entries) {
Eif (e.isFile() && e.name.endsWith('.html')) {
files.push(path.join(abs, e.name));
}
}
if (src.recurse) {
for (const e of entries) {
Eif (!e.isDirectory()) continue;
files.push(
...resolvePageFiles(
{ ...set, sources: [{ path: path.join(src.path, e.name), recurse: true }] },
projectRoot,
),
);
}
}
}
}
return files;
}
/**
* Resolve the rewritten `href` for a stylesheet link based on the
* original relative form. The hashed CSS asset always lives at
* `<dist>/assets/styles-<hash>.css`, so root-level pages reference
* `assets/...` and one-level-deep pages reference `../assets/...`.
*
* @param {string} originalHref e.g. `styles.css`, `../styles.css`
* @param {string} hashedAsset e.g. `assets/styles-Ab12.css`
* @returns {string}
*/
function rewrittenHref(originalHref, hashedAsset) {
if (originalHref.startsWith('../')) return `../${hashedAsset}`;
Iif (originalHref.startsWith('/')) return `/${hashedAsset}`;
return hashedAsset;
}
/**
* Vite plugin factory.
*
* @param {{
* projectRoot: string,
* outDir: string,
* pageSets: ReadonlyArray<StaticPageSet>
* }} options
* @returns {import('vite').Plugin}
*/
export default function staticPagesPlugin(options) {
const { projectRoot, outDir, pageSets } = options;
return {
name: 'static-pages-emit',
apply: 'build',
enforce: 'post',
closeBundle: {
order: 'post',
sequential: true,
handler() {
const distDir = path.isAbsolute(outDir) ? outDir : path.join(projectRoot, outDir);
const hashedAsset = readStylesAssetName(distDir);
const cssAbs = path.join(distDir, hashedAsset);
const cssBuf = fs.readFileSync(cssAbs);
const integrity = `sha384-${sha384Base64(cssBuf)}`;
let totalEmitted = 0;
let totalRewritten = 0;
const setSummary = [];
for (const set of pageSets) {
const files = resolvePageFiles(set, projectRoot);
let emitted = 0;
let rewritten = 0;
for (const absPath of files) {
const rel = path.relative(projectRoot, absPath);
const destAbs = path.join(distDir, rel);
fs.mkdirSync(path.dirname(destAbs), { recursive: true });
const html = fs.readFileSync(absPath, 'utf8');
let didRewrite = false;
const out = html.replace(
STYLESHEET_LINK_RE,
(_m, before, mid, href, after) => {
didRewrite = true;
const newHref = rewrittenHref(href, hashedAsset);
return (
`<link${before}rel="stylesheet"${mid}` +
`href="${newHref}" integrity="${integrity}" crossorigin="anonymous"${after}>`
);
},
);
fs.writeFileSync(destAbs, out, 'utf8');
emitted += 1;
if (didRewrite) rewritten += 1;
}
setSummary.push({ label: set.label, count: emitted, rewritten });
totalEmitted += emitted;
totalRewritten += rewritten;
}
const summary = setSummary
.map((s) => `${s.label}=${s.count}/${s.rewritten}`)
.join(', ');
console.log(
`[static-pages] emitted ${totalEmitted} HTML page(s), ` +
`rewrote styles.css href in ${totalRewritten} (${summary})`,
);
},
},
};
}
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