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Minify CDN CSS with esbuild to stop dropped rules (#220)

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Tailwind's --minify (Lightning CSS) randomly drops rules from the CDN .min.css files (parcel-bundler/lightningcss#1235). Minify with esbuild using Tailwind v4's browser targets instead, fail the build on esbuild warnings, and have npm run check fail if a .min.css file loses any selector from its unminified file.
This commit is contained in:
Grug
2026-10-23 18:15:35 +08:00
committed by GitHub
parent 275782b7e5
commit 6769c83c96
5 changed files with 610 additions and 3 deletions
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CHANGELOG.md
+1
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@@ -31,6 +31,7 @@
- Stopped Dialogs and Command Dialogs from closing when a press starts inside the dialog and the drag ends on the backdrop. Updated the Nunjucks and Jinja templates and the docs examples. Based on [#104](https://github.com/hunvreus/basecoat/pull/104) by [@PhilipdeRijk](https://github.com/PhilipdeRijk).
- Fixed iOS auto-zoom when tapping the Combobox input, the Combobox chips input, the Command search input, native Selects, and Input Group inputs and textareas by using `text-base` below the `md` breakpoint, like regular inputs. The compact Lyra and Mira styles keep their smaller sizes.
- Fixed Slider thumb hover and focus rings, the RTL Sidebar submenu chevron, and some dark mode and tooltip arrow styles not applying in the unminified CDN files, because the rules were nested under pseudo-elements.
- Fixed CDN `.min.css` builds occasionally dropping rules (such as hidden Combobox, Command and Select options) by minifying with esbuild instead of Tailwind's minifier.
- Stopped the Toast docs example from pushing its fragment URL into the browser history with HTMX.
- Replaced the `.form` migration snippet in the 1.0.0 notes, which fails in Tailwind v4, with markup that works.
package-lock.json
Generated
+485
View File
@@ -10,11 +10,454 @@
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"esbuild": "0.28.2",
"prettier": "^3.5.3",
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"terser": "^5.42.0"
}
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"cpu": [
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"optional": true,
"os": [
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"engines": {
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@@ -728,6 +1171,48 @@
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}
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"dev": true,
"hasInstallScript": true,
"license": "MIT",
"bin": {
"esbuild": "bin/esbuild"
},
"engines": {
"node": ">=18"
},
"optionalDependencies": {
"@esbuild/aix-ppc64": "0.28.2",
"@esbuild/android-arm": "0.28.2",
"@esbuild/android-arm64": "0.28.2",
"@esbuild/android-x64": "0.28.2",
"@esbuild/darwin-arm64": "0.28.2",
"@esbuild/darwin-x64": "0.28.2",
"@esbuild/freebsd-arm64": "0.28.2",
"@esbuild/freebsd-x64": "0.28.2",
"@esbuild/linux-arm": "0.28.2",
"@esbuild/linux-arm64": "0.28.2",
"@esbuild/linux-ia32": "0.28.2",
"@esbuild/linux-loong64": "0.28.2",
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"@esbuild/linux-s390x": "0.28.2",
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"node_modules/fill-range": {
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package.json
+1
View File
@@ -134,6 +134,7 @@
},
"devDependencies": {
"@tailwindcss/cli": "^4.1.17",
"esbuild": "0.28.2",
"prettier": "^3.5.3",
"tailwindcss": "^4.1.17",
"terser": "^5.42.0"
scripts/build.js
+13 -1
View File
@@ -3,10 +3,16 @@ import path from 'path';
import { fileURLToPath } from 'url';
import { exec } from 'child_process';
import { promisify } from 'util';
import { transform } from 'esbuild';
import { generateCssEntrypoints } from './generate-css-entrypoints.js';
const execPromise = promisify(exec);
// Tailwind CSS v4 browser baseline (https://tailwindcss.com/docs/compatibility).
// Minified CDN CSS uses esbuild because Tailwind's --minify (Lightning CSS) can
// randomly drop rules (parcel-bundler/lightningcss#1235).
const cssTargets = ['chrome111', 'safari16.4', 'firefox128'];
// Resolve project root, assuming this script is in <project_root>/scripts/
const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);
@@ -214,7 +220,13 @@ async function build() {
await execPromise(`npx tailwindcss -i "${cdnCssSrc}" -o "${cssDistCdnPath}"`);
console.log(`Generated non-minified CSS: ${cssDistCdnPath}`);
await execPromise(`npx tailwindcss -i "${cdnCssSrc}" -o "${cssDistCdnMinPath}" --minify`);
const { code, warnings } = await transform(await fs.readFile(cssDistCdnPath, 'utf-8'), {
loader: 'css',
minify: true,
target: cssTargets,
});
if (warnings.length) throw new Error(`esbuild warnings for ${cssDistCdnPath}: ${warnings.map((w) => w.text).join('; ')}`);
await fs.writeFile(cssDistCdnMinPath, code);
console.log(`Generated minified CSS: ${cssDistCdnMinPath}`);
}
scripts/check.js
+110 -2
View File
@@ -1,5 +1,5 @@
// Cheap sanity checks. Run after a build.
// node scripts/check.js package: every export target exists, JS parses
// node scripts/check.js package: every export target exists, JS parses, min CSS keeps all selectors
// node scripts/check.js site docs site: site/dist built, llms.txt links to .md exports
import fs from 'fs';
import path from 'path';
@@ -36,6 +36,111 @@ function checkPackage() {
}
}
// Minified CDN CSS must keep every selector of its unminified source.
// Selectors are flattened (nesting resolved, :is() lists expanded) and normalized
// (::after/:after, attribute quotes, combinator spacing, from/0%) before comparing.
function splitTop(str) {
const out = [];
let depth = 0, quote = null, cur = '';
for (let i = 0; i < str.length; i++) {
const c = str[i];
if (quote) { cur += c; if (c === '\\') cur += str[++i] ?? ''; else if (c === quote) quote = null; continue; }
if (c === '"' || c === "'") { quote = c; cur += c; continue; }
if (c === '(' || c === '[') depth++;
else if (c === ')' || c === ']') depth--;
if (c === ',' && depth === 0) { out.push(cur); cur = ''; } else cur += c;
}
out.push(cur);
return out.map((s) => s.trim()).filter(Boolean);
}
function parseCss(css) {
css = css.replace(/\/\*[\s\S]*?\*\//g, '');
const root = { children: [] };
const stack = [root];
let buf = '', quote = null, paren = 0;
for (let i = 0; i < css.length; i++) {
const c = css[i];
if (quote) { buf += c; if (c === '\\') buf += css[++i] ?? ''; else if (c === quote) quote = null; continue; }
if (c === '"' || c === "'") { quote = c; buf += c; continue; }
if (c === '(') paren++;
else if (c === ')') paren--;
if (paren > 0) { buf += c; continue; }
if (c === '{') { const node = { prelude: buf.trim(), children: [] }; stack.at(-1).children.push(node); stack.push(node); buf = ''; }
else if (c === '}') { if (buf.trim()) stack.at(-1).children.push({ decl: true }); stack.pop(); buf = ''; }
else if (c === ';') { if (buf.trim()) stack.at(-1).children.push({ decl: true }); buf = ''; }
else buf += c;
}
return root;
}
function normalizeSelector(s) {
return s
.replace(/::(before|after|first-line|first-letter)\b/g, ':$1')
.replace(/\[\s*([^\]=~|^$*\s]+)\s*([~|^$*]?=)\s*(["'])((?:\\.|(?!\3).)*)\3\s*(\s[is])?\s*\]/g, '[$1$2$4$5]')
.replace(/\s+/g, ' ')
.replace(/\s*([>+~,])\s*/g, '$1')
.replace(/\(\s+/g, '(')
.replace(/\s+\)/g, ')')
.replace(/^from$/, '0%')
.replace(/^to$/, '100%')
.trim();
}
function expandIs(sel) {
const i = sel.indexOf(':is(');
if (i < 0) return [sel];
let depth = 0, j = i + 3;
for (; j < sel.length; j++) { if (sel[j] === '(') depth++; else if (sel[j] === ')' && --depth === 0) break; }
const inner = splitTop(sel.slice(i + 4, j));
const attached = i > 0 && !/[\s>+~(,]/.test(sel[i - 1]);
if (attached && inner.some((part) => /[\s>+~]/.test(part.replace(/\([^)]*\)/g, '')))) {
return expandIs(sel.slice(j + 1)).map((rest) => sel.slice(0, j + 1) + rest);
}
return inner.flatMap((part) => expandIs(sel.slice(0, i) + part + sel.slice(j + 1)));
}
function flatSelectors(css) {
const keys = new Set();
const normParams = (p) => p.replace(/\s+/g, ' ').replace(/\s*([():,<>=]+)\s*/g, '$1').replace(/"/g, "'").trim().toLowerCase();
const walk = (node, ctx, parents) => {
for (const child of node.children) {
if (!child.children) continue;
const pre = child.prelude;
if (pre.startsWith('@')) {
const [, name, params] = pre.match(/^@([\w-]+)\s*([\s\S]*)$/);
const at = `@${name} ${normParams(params)}`;
if (/^(media|supports|layer|container|keyframes|-webkit-keyframes|scope|starting-style)$/.test(name)) {
// Declarations directly inside a nested at-rule belong to the parent selectors.
if (parents && child.children.some((c) => c.decl)) for (const p of parents) keys.add(`${[...ctx, at].join(' | ')} || ${p}`);
walk(child, [...ctx, at], name.endsWith('keyframes') ? null : parents);
} else keys.add([...ctx, at].join(' | '));
continue;
}
const own = splitTop(pre);
const sels = (parents ? parents.flatMap((p) => own.map((s) => (s.includes('&') ? s.replace(/&/g, p) : `${p} ${s}`))) : own)
.map(normalizeSelector).flatMap(expandIs).map(normalizeSelector);
if (child.children.some((c) => c.decl)) for (const s of sels) keys.add(`${ctx.join(' | ')} || ${s}`);
walk(child, ctx, sels);
}
};
walk(parseCss(css), [], null);
return keys;
}
function checkMinifiedCss() {
const dist = path.join(root, 'dist');
for (const name of fs.existsSync(dist) ? fs.readdirSync(dist) : []) {
if (!name.endsWith('.cdn.css')) continue;
const minName = name.replace(/\.css$/, '.min.css');
const minFile = path.join(dist, minName);
if (!fs.existsSync(minFile)) { errors.push(`dist/${minName} is missing`); continue; }
const min = flatSelectors(fs.readFileSync(minFile, 'utf8'));
const missing = [...flatSelectors(fs.readFileSync(path.join(dist, name), 'utf8'))].filter((key) => !min.has(key));
if (missing.length) errors.push(`dist/${minName} dropped ${missing.length} selector(s) from dist/${name}, e.g. ${missing.slice(0, Number(process.env.SHOW || 3)).join('; ')}`);
}
}
function checkSite() {
const dist = path.join(root, 'site', 'dist');
for (const file of ['index.html', 'llms.txt', 'llms-full.txt']) {
@@ -51,7 +156,10 @@ function checkSite() {
}
const target = process.argv[2] || 'package';
if (target === 'package') checkPackage();
if (target === 'package') {
checkPackage();
checkMinifiedCss();
}
else if (target === 'site') checkSite();
else {
console.error(`Unknown target "${target}". Use "package" or "site".`);