index.mjs

import postcssBrowserComments from 'postcss-browser-comments';
import path from 'node:path';
import { createRequire } from 'node:module';
import path$1 from 'path';
import fs from 'fs';
import postcss from 'postcss';

const assign = (...objects) => Object.assign(...objects);
const create = (...objects) => assign(Object.create(null), ...objects);

const require = createRequire(import.meta.url);

// get resolved filenames for normalize.css
const normalizeCSS = require.resolve('@csstools/normalize.css');
const normalizeDir = path.dirname(normalizeCSS);
const normalizeOpinionatedCSS = path.join(normalizeDir, 'opinionated.css');

// get resolved filenames for sanitize.css
const sanitizeCSS = require.resolve('sanitize.css');
const sanitizeDir = path.dirname(sanitizeCSS);
const sanitizeAssetsCSS = path.join(sanitizeDir, 'assets.css');
const sanitizeFormsCSS = path.join(sanitizeDir, 'forms.css');
const sanitizeReduceMotionCSS = path.join(sanitizeDir, 'reduce-motion.css');
const sanitizeTypographyCSS = path.join(sanitizeDir, 'typography.css');
const sanitizeSystemUiCSS = path.join(sanitizeDir, 'system-ui.css');
const sanitizeUiMonospace = path.join(sanitizeDir, 'ui-monospace.css');

// export a hashmap of css library filenames
const parsableFilenames = create({
	[normalizeCSS]: true,
	[normalizeOpinionatedCSS]: true,
	[sanitizeCSS]: true,
	[sanitizeAssetsCSS]: true,
	[sanitizeFormsCSS]: true,
	[sanitizeReduceMotionCSS]: true,
	[sanitizeTypographyCSS]: true,
	[sanitizeSystemUiCSS]: true,
	[sanitizeUiMonospace]: true,
});

// export a hashmap of css library filenames by id
const resolvedFilenamesById = create({
	'normalize': [normalizeCSS],
	'normalize/opinionated': [normalizeOpinionatedCSS],
	'normalize/*': [normalizeOpinionatedCSS],
	'sanitize': [sanitizeCSS],
	'sanitize/assets': [sanitizeAssetsCSS],
	'sanitize/forms': [sanitizeCSS, sanitizeFormsCSS],
	'sanitize/page': [sanitizeAssetsCSS], // deprecated; remaining for v10.0.0 compatibility
	'sanitize/reduce-motion': [sanitizeCSS, sanitizeReduceMotionCSS],
	'sanitize/system-ui': [sanitizeCSS, sanitizeSystemUiCSS],
	'sanitize/typography': [sanitizeCSS, sanitizeTypographyCSS],
	'sanitize/ui-monospace': [sanitizeCSS, sanitizeUiMonospace],
	'sanitize/*': [sanitizeCSS, sanitizeFormsCSS],
});

const cache$1 = create();

async function readFile (filename) {
	filename = path$1.resolve(filename);

	cache$1[filename] = cache$1[filename] || create();

	return new Promise(
		(resolve, reject) => fs.stat(
			filename,
			(statsError, { mtime }) => statsError
				? reject(statsError)
			: mtime === cache$1[filename].mtime
				? resolve(cache$1[filename].data)
			: fs.readFile(
				filename,
				'utf8',
				(readFileError, data) => readFileError
					? reject(readFileError)
				: resolve(
					(cache$1[filename] = { data, mtime }).data
				)
			)
		)
	)
}

const cache = create(null);

var parse = (filename, transformer) => readFile(filename).then(
	// cache the parsed css root
	css => (cache[css] = cache[css] || postcss.parse(css, { from: filename }))
).then(
	// clone the cached root
	root => root.clone()
).then(
	// transform the cloned root
	clone => Promise.resolve(
		transformer(clone)
	).then(
		// resolve the cloned root
		() => clone
	)
);

var postcssImportNormalize = commentsTransformer => opts => {
	opts = create(opts);

	// return an postcss-import configuration
	return create({
		load (filename, importOptions) {
			return filename in parsableFilenames
				// parse the file (the file and css are conservatively cached)
				? parse(filename, commentsTransformer).then(
					root => root.toResult({ to: filename, map: true }).css
				)
			: typeof opts.load === 'function'
				// otherwise, use the override loader
				? opts.load.call(null, filename, importOptions)
			// otherwise, return the (conservatively cached) contents of the file
			: readFile(filename)
		},
		resolve (id, basedir, importOptions) {
			// get the css id by removing css extensions
			const cssId = id.replace(cssExtRegExp$1, '');

			return cssId in resolvedFilenamesById
				// return the known resolved path for the css id
				? resolvedFilenamesById[cssId]
			: typeof opts.resolve === 'function'
				// otherwise, use the override resolver
				? opts.resolve.call(null, id, basedir, importOptions)
			// otherwise, return the id to be resolved by postcss-import
			: id
		}
	})
};

const cssExtRegExp$1 = /\.css\b/g;

const postcssPlugin = (commentsTransformer, opts) => root => {
	const promises = [];
	const insertedFilenames = {};

	// use @import insertion point
	root.walkAtRules(
		importRegExp,
		atrule => {
			// get name as a fallback value for the library (e.g. @import-normalize is like @import "normalize.css")
			const name = atrule.name.match(importRegExp)[1];

			// get url from "library", 'library', url("library"), url('library'), or the fallback value
			const url = (atrule.params.match(paramsRegExp) || []).slice(1).find(part => part) || name;

			if (url) {
				// get the css id by removing css extensions
				const cssId = url.replace(cssExtRegExp, '');

				if (cssId in resolvedFilenamesById) {
					// promise the library import is replaced with its contents
					promises.push(
						Promise.all(
							resolvedFilenamesById[cssId].filter(
								// ignore filenames that have already been inserted
								filename => insertedFilenames[filename] = opts.allowDuplicates || !(filename in insertedFilenames)
							).map(
								// parse the file (the file and css are conservatively cached)
								filename => parse(filename, commentsTransformer)
							)
						).then(roots => {
							if (roots.length) {
								// combine all the library nodes returned by the parsed files
								const nodes = roots.reduce(
									(all, root) => all.concat(root.nodes),
									[]
								);

								// replace the import with all the library nodes
								atrule.replaceWith(...nodes);
							}
						})
					);
				}
			}
		}
	);

	return Promise.all([].concat(
		// promise the library imports are replaced with their contents
		promises,
		// promise certain libraries are prepended
		Promise.all(
			[].concat(
				opts.forceImport || []
			).reduce(
				// filter the id to be a known id or boolean true
				(all, id) => {
					if (id === true) {
						all.push(...resolvedFilenamesById.normalize);
					} else if (typeof id === 'string') {
						const cssId = id.replace(cssExtRegExp, '');

						if (cssId in resolvedFilenamesById) {
							all.push(...resolvedFilenamesById[cssId]);
						}
					}

					return all
				},
				[]
			).filter(
				// ignore filenames that have already been inserted
				filename => insertedFilenames[filename] = opts.allowDuplicates || !(filename in insertedFilenames)
			).map(
				// parse the file (the file and css are conservatively cached)
				filename => parse(filename, commentsTransformer)
			)
		).then(roots => {
			if (roots.length) {
				// combine all the library nodes returned by the parsed files
				const nodes = roots.reduce(
					(all, root) => all.concat(root.nodes),
					[]
				);

				// prepend the stylesheet with all the library nodes
				root.prepend(...nodes);
			}
		})
	))
};

const cssExtRegExp = /\.css\b/g;
const importRegExp = /^import(?:-(normalize|sanitize))?$/;
const paramsRegExp = /^\s*(?:url\((?:"(.+)"|'(.+)')\)|"(.+)"|'(.+)')[\W\w]*$/;

const plugin = opts => {
	opts = create(opts);

	const commentsTransformer = postcssBrowserComments(opts).Once;
	const normalizeTransformer = postcssPlugin(commentsTransformer, opts);
	const postcssImportConfig = postcssImportNormalize(commentsTransformer);

	return {
		postcssPlugin: 'postcss-normalize',
		Once(root) {
			return normalizeTransformer(root)
		},
		postcssImport: postcssImportConfig
	}
};

plugin.postcss = true;

export { plugin as default };