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* Minify every HTML / CSS / JS file under `dist/` in place.
*
* Replacement for the `dra1ex/minify-action` Docker action — same
* underlying [`minify`](https://github.com/coderaiser/minify) package
* (now v15.x) but executed directly on the runner host so deploy-s3
* needs no Docker pull, no apt-get / moreutils install, and no
* workspace staging.
*
* Filenames and paths are preserved (this script only rewrites file
* contents), so all `<link href="…">` / `<script src="…">` references,
* CloudFront origin paths and S3 cache headers continue to work
* unchanged.
*
* **SRI is NOT preserved** — rewriting CSS/JS bytes invalidates any
* `integrity="sha384-…"` attributes that `vite-plugin-sri-gen` injected
* at build time. The `deploy-s3.yml` pipeline therefore runs
* `scripts/update-sri.ts` immediately after this minify pass to
* re-compute and rewrite those attributes; without that follow-up
* step browsers would block the stylesheet on every page load.
*
* Skips:
* - whole directories matched by `SKIP_DIRS` (`node_modules`, `.git`,
* `.vite`, `cia-data`, `coverage`, `test-results`) — none of these
* ship runtime-minifiable text;
* - any file whose extension is not in the target set (`.html`,
* `.css`, `.js`, `.mjs`) — so JSON, CSV, images, fonts, source
* maps and the like are simply never collected by `collect()`;
* - explicitly: source maps (`*.map`) and any file with `.min.` in
* the basename (e.g. `mermaid.esm.min.mjs`) — already minified.
*
* Files that fail to parse are left untouched (and a warning is
* printed) so a single broken page never aborts the entire deploy.
*
* @author Hack23 AB
* @license Apache-2.0
*/
import { promises as fs } from 'node:fs';
import path from 'node:path';
import process from 'node:process';
import { fileURLToPath } from 'node:url';
import { minify } from 'minify';
const projectRoot = path.resolve(
path.dirname(fileURLToPath(import.meta.url)),
'..',
);
interface MinifyStat {
ext: string;
files: number;
before: number;
after: number;
failed: number;
}
const SKIP_DIRS = new Set([
'node_modules',
'.git',
'.vite',
'cia-data',
'coverage',
'test-results',
]);
/**
* Recursively collect every minifiable file under `dir`. Skips
* already-minified `*.min.*` files and source maps.
*/
async function collect(
dir: string,
exts: ReadonlySet<string>,
out: string[],
): Promise<string[]> {
let entries: import('node:fs').Dirent[];
try {
entries = await fs.readdir(dir, { withFileTypes: true });
} catch {
return out;
}
for (const entry of entries) {
const full = path.join(dir, entry.name);
if (entry.isDirectory()) {
Iif (SKIP_DIRS.has(entry.name)) continue;
await collect(full, exts, out);
} else Eif (entry.isFile()) {
const lower = entry.name.toLowerCase();
if (lower.endsWith('.map')) continue;
// Treat *.min.* files as already minified (covers .min.css,
// .min.js, .min.mjs, .min.html — e.g. mermaid.esm.min.mjs).
if (lower.includes('.min.')) continue;
const ext = path.extname(lower);
Eif (exts.has(ext)) out.push(full);
}
}
return out;
}
function fmtKb(bytes: number): string {
return `${(bytes / 1024).toFixed(1)} KiB`;
}
async function run(distDir: string): Promise<void> {
Iif (!(await fs.stat(distDir).catch(() => null))?.isDirectory()) {
throw new Error(`[minify-dist] ${distDir} is not a directory`);
}
const exts = new Set(['.html', '.css', '.js', '.mjs']);
const files = await collect(distDir, exts, []);
console.log(
`🗜️ Minifying ${files.length} files under ${path.relative(projectRoot, distDir) || '.'}…`,
);
/** Aggregate per-extension stats for the summary line. */
const stats = new Map<string, MinifyStat>();
const bumpStat = (
ext: string,
before: number,
after: number,
failed = false,
): void => {
const cur = stats.get(ext) ?? {
ext,
files: 0,
before: 0,
after: 0,
failed: 0,
};
cur.files += 1;
cur.before += before;
cur.after += after;
Iif (failed) cur.failed += 1;
stats.set(ext, cur);
};
/* Process sequentially in batches to keep peak memory bounded — the
* homepage corpus is ~5 000 HTML files, each up to 200 KiB. 10
* concurrent minifies cap memory at well under the runner's 7 GB. */
const concurrency = 10;
let cursor = 0;
async function worker(): Promise<void> {
while (cursor < files.length) {
const file = files[cursor++];
Iif (file === undefined) return;
const ext = path.extname(file).toLowerCase();
let before = 0;
try {
before = (await fs.stat(file)).size;
const minified = await minify(file);
Iif (typeof minified !== 'string') {
bumpStat(ext, before, before, true);
console.warn(
` ⚠ ${path.relative(projectRoot, file)}: minify returned non-string output`,
);
continue;
}
await fs.writeFile(file, minified, 'utf8');
bumpStat(ext, before, Buffer.byteLength(minified, 'utf8'));
} catch (err) {
bumpStat(ext, before, before, true);
console.warn(
` ⚠ ${path.relative(projectRoot, file)}: ${(err as Error).message}`,
);
}
}
}
await Promise.all(Array.from({ length: concurrency }, worker));
let totalBefore = 0;
let totalAfter = 0;
let totalFailed = 0;
for (const s of stats.values()) {
totalBefore += s.before;
totalAfter += s.after;
totalFailed += s.failed;
const saved = s.before - s.after;
const pct = s.before > 0 ? ((saved / s.before) * 100).toFixed(1) : '0.0';
console.log(
` • ${s.ext}: ${s.files} files, ${fmtKb(s.before)} → ${fmtKb(s.after)} ` +
`(saved ${fmtKb(saved)}, ${pct}%, ${s.failed} failed)`,
);
}
const totalSaved = totalBefore - totalAfter;
const totalPct =
totalBefore > 0 ? ((totalSaved / totalBefore) * 100).toFixed(1) : '0.0';
console.log(
`✅ Minify complete: ${fmtKb(totalBefore)} → ${fmtKb(totalAfter)} ` +
`(saved ${fmtKb(totalSaved)}, ${totalPct}%, ${totalFailed} failed)`,
);
}
async function main(): Promise<void> {
const distArg = process.argv[2] ?? path.join(projectRoot, 'dist');
const distDir = path.resolve(distArg);
await run(distDir);
}
const isMain =
process.argv[1] !== undefined &&
path.resolve(process.argv[1]) === fileURLToPath(import.meta.url);
Iif (isMain) {
main().catch((err) => {
console.error('[minify-dist]', err);
process.exit(1);
});
}
export { run };
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