84 lines
2.2 KiB
JavaScript
84 lines
2.2 KiB
JavaScript
const { memoize, isString, isRegExp } = require('lodash');
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const { parse } = require('postcss');
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const { CSS_TO_REMOVE } = require('./constants');
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const getSelectorRemoveTesters = memoize(() =>
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CSS_TO_REMOVE.map((x) => {
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if (isString(x)) {
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return (selector) => x === selector;
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}
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if (isRegExp(x)) {
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return (selector) => x.test(selector);
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}
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throw new Error(`Unexpected type in CSS_TO_REMOVE content "${x}". Expected String or RegExp.`);
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}),
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);
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const getRemoveTesters = memoize(() => {
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const selectorTesters = getSelectorRemoveTesters();
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// These are mostly carried over from the previous project
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// https://gitlab.com/gitlab-org/frontend/gitlab-css-statistics/-/blob/2aa00af25dba08fc71081c77206f45efe817ea4b/lib/gl_startup_extract.js
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return [
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(node) => node.type === 'comment',
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(node) =>
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node.type === 'atrule' &&
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(node.params === 'print' ||
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node.params === 'prefers-reduced-motion: reduce' ||
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node.name === 'keyframe' ||
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node.name === 'charset'),
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(node) => node.selector && node.selectors && !node.selectors.length,
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(node) => node.selector && selectorTesters.some((fn) => fn(node.selector)),
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(node) =>
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node.type === 'decl' &&
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(node.prop === 'transition' ||
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node.prop.indexOf('-webkit-') > -1 ||
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node.prop.indexOf('-ms-') > -1),
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];
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});
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const getNodesToRemove = (nodes) => {
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const removeTesters = getRemoveTesters();
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const remNodes = [];
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nodes.forEach((node) => {
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if (removeTesters.some((fn) => fn(node))) {
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remNodes.push(node);
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} else if (node.nodes?.length) {
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remNodes.push(...getNodesToRemove(node.nodes));
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}
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});
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return remNodes;
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};
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const getEmptyNodesToRemove = (nodes) =>
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nodes
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.filter((node) => node.nodes)
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.reduce((acc, node) => {
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if (node.nodes.length) {
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acc.push(...getEmptyNodesToRemove(node.nodes));
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} else {
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acc.push(node);
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}
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return acc;
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}, []);
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const cleanCSS = (css) => {
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const cssRoot = parse(css);
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getNodesToRemove(cssRoot.nodes).forEach((node) => {
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node.remove();
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});
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getEmptyNodesToRemove(cssRoot.nodes).forEach((node) => {
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node.remove();
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});
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return cssRoot.toResult().css;
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};
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module.exports = { cleanCSS };
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