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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.
*
* **No SRI rewrite is needed** — `vite-plugin-sri-gen` was removed
* from `vite.config.js` and `vite-plugin-static-pages.js` no longer
* stamps `integrity` attributes onto first-party `<link>` tags
* (per the platform "trust S3 / CloudFront" classification). This
* script can therefore freely rewrite CSS/JS bytes without breaking
* any cached HTML page.
*
* Skips:
* - whole directories matched by `SKIP_DIRS` (`node_modules`, `.git`,
* `.vite`, `cia-data`, `coverage`, `test-results`) — none of these
* ship runtime-minifiable text;
* - whole subtrees matched by `SKIP_SUBPATHS`:
* • the vendored Mermaid ESM bundle under `js/lib/mermaid/`.
* Mermaid ships pre-optimized chunks (`chunk-*.mjs` and the
* entry `mermaid.esm.min.mjs`); only the entry carries the
* `.min.` basename marker, so a path-based skip is required
* to also exclude the chunk graph. Re-running
* `coderaiser/minify` over those chunks risks corrupting
* `import.meta.url` semantics and the dynamic-import graph
* the Mermaid runtime depends on (regression observed after
* PR #2428).
* • every Vite/esbuild-bundled JS chunk under `assets/js/`.
* These are already esbuild-minified at build time
* (`vite.config.js → build.minify: 'esbuild'`), so re-running
* `coderaiser/minify` yields zero compression while actively
* CORRUPTING valid JS: `@putout/minify` strips outer parens
* around a comma-expression initializer in a `var` declarator
* (`var n=A, r=(B, this.method())` → `var n=A, r=B, this.method()`),
* which is no longer a valid var declaration. That regression
* broke `assets/js/papa-*.js` (PapaParse `Streamer.parseChunk`)
* and via the import chain ALL 9 CIA dashboards on every one
* of the 14 language hub pages.
* - 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',
]);
/**
* POSIX-style relative subpaths under `distDir` whose contents must
* never be re-minified. Stored as POSIX so the comparison works
* identically on Linux runners and Windows dev machines after
* normalising candidate paths via `split(path.sep).join('/')`.
*
* Currently:
* - `js/lib/mermaid` — vendored Mermaid ESM bundle. Mermaid ships
* pre-optimized chunks (`chunk-*.mjs`) that don't carry the
* `.min.` basename marker, so the per-file `.min.` skip alone
* leaves them in scope. Re-running `coderaiser/minify` over
* those chunks risks corrupting the dynamic-import graph.
* - `assets/js` — Vite/esbuild-bundled application chunks
* (`assets/js/*.js`). These are ALREADY esbuild-minified at
* build time (vite.config.js sets `build.minify: 'esbuild'`),
* so re-running `coderaiser/minify` (which uses
* `@putout/minify` under the hood) yields zero compression
* while actively CORRUPTING valid JS. Specifically,
* `@putout/minify` strips the outer parentheses from a
* comma-expression initializer in a `var` declarator, so
* valid `var n=A, r=(B, C);` becomes invalid
* `var n=A, r=B, C;` — when `C` is a method call
* (`this._handle.parse(...)`), the browser refuses to parse
* the module with `SyntaxError: Unexpected token 'this'`.
* That bug broke every CIA dashboard chunk that imports
* `assets/js/papa-*.js` (PapaParse — the failing fragment is
* in `Streamer.parseChunk`). Skipping the whole subtree is
* the only safe option: every file under `assets/js/` is a
* Vite-bundled output (esbuild minified, source-mapped,
* content-hashed), and no other tool ever needs to read or
* mutate those bytes after Vite has emitted them.
*/
const SKIP_SUBPATHS = new Set([
'js/lib/mermaid',
'assets/js',
]);
/**
* Walk `dir` (rooted at `distDir`) and return true when the
* directory's relative POSIX path under `distDir` matches a
* `SKIP_SUBPATHS` entry exactly.
*/
function isSkippedSubpath(distDir: string, dir: string): boolean {
if (dir === distDir) return false;
const rel = path.relative(distDir, dir).split(path.sep).join('/');
return SKIP_SUBPATHS.has(rel);
}
/**
* Recursively collect every minifiable file under `dir`. Skips
* already-minified `*.min.*` files, source maps, and any directory
* whose path is in `SKIP_SUBPATHS` (relative to `distRoot`).
*/
async function collect(
dir: string,
exts: ReadonlySet<string>,
out: string[],
distRoot: string = dir,
): 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()) {
if (SKIP_DIRS.has(entry.name)) continue;
if (isSkippedSubpath(distRoot, full)) continue;
await collect(full, exts, out, distRoot);
} else if (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);
if (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> {
if (!(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;
if (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++];
if (file === undefined) return;
const ext = path.extname(file).toLowerCase();
let before = 0;
try {
before = (await fs.stat(file)).size;
const minified = await minify(file);
if (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);
if (isMain) {
main().catch((err) => {
console.error('[minify-dist]', err);
process.exit(1);
});
}
export { run };
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