72 lines
1.9 KiB
JavaScript
72 lines
1.9 KiB
JavaScript
const fs = require('fs');
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const cheerio = require('cheerio');
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const { mergeWith, isArray } = require('lodash');
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const { PurgeCSS } = require('purgecss');
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const purgeHtml = require('purgecss-from-html');
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const { cleanCSS } = require('./clean_css');
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const { HTML_TO_REMOVE } = require('./constants');
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const { die } = require('./utils');
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const cleanHtml = (html) => {
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const $ = cheerio.load(html);
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HTML_TO_REMOVE.forEach((selector) => {
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$(selector).remove();
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});
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return $.html();
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};
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const mergePurgeCSSOptions = (...options) =>
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mergeWith(...options, (objValue, srcValue) => {
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if (isArray(objValue)) {
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return objValue.concat(srcValue);
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}
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return undefined;
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});
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const getStartupCSS = async ({ htmlPaths, cssPaths, purgeOptions }) => {
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const content = htmlPaths.map((htmlPath) => {
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if (!fs.existsSync(htmlPath)) {
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die(
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`Could not find fixture "${htmlPath}". Have you run the fixtures? (bundle exec rspec spec/frontend/fixtures/startup_css.rb)`,
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);
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}
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const rawHtml = fs.readFileSync(htmlPath);
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const html = cleanHtml(rawHtml);
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return { raw: html, extension: 'html' };
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});
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const purgeCSSResult = await new PurgeCSS().purge({
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content,
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css: cssPaths,
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...mergePurgeCSSOptions(
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{
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fontFace: true,
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variables: true,
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keyframes: true,
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blocklist: [/:hover/, /:focus/, /-webkit-/, /-moz-focusring-/, /-ms-expand/],
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safelist: {
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standard: ['brand-header-logo'],
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},
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// By default, PurgeCSS ignores special characters, but our utilities use "!"
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defaultExtractor: (x) => x.match(/[\w-!]+/g),
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extractors: [
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{
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extractor: purgeHtml,
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extensions: ['html'],
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},
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],
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},
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purgeOptions,
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),
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});
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return purgeCSSResult.map(({ css }) => cleanCSS(css)).join('\n');
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};
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module.exports = { getStartupCSS };
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