73 lines
2.7 KiB
JavaScript
73 lines
2.7 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = minifyCss;
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var _helpers = require("../helpers.cjs");
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const postcssOptions = {
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// Prevent the following warning from being shown:
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// > Without `from` option PostCSS could generate wrong source map and will not find Browserslist config.
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// > Set it to CSS file path or to `undefined` to prevent this warning.
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from: undefined
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};
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/** Minify CSS with cssnano */
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async function minifyCss(tree, options, cssnanoOptions) {
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const cssnano = await (0, _helpers.optionalImport)('cssnano');
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const postcss = await (0, _helpers.optionalImport)('postcss');
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if (!cssnano || !postcss) {
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return tree;
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}
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let promises = [];
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tree.walk(node => {
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// Skip SRI, reasons are documented in "minifyJs" module
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if (node.attrs && 'integrity' in node.attrs) {
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return node;
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}
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if ((0, _helpers.isStyleNode)(node)) {
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promises.push(processStyleNode(node, cssnanoOptions, cssnano, postcss));
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} else if (node.attrs && node.attrs.style) {
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promises.push(processStyleAttr(node, cssnanoOptions, cssnano, postcss));
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}
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return node;
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});
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return Promise.all(promises).then(() => tree);
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}
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function processStyleNode(styleNode, cssnanoOptions, cssnano, postcss) {
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let css = (0, _helpers.extractCssFromStyleNode)(styleNode);
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// Improve performance by avoiding calling stripCdata again and again
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let isCdataWrapped = false;
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if (css.includes('CDATA')) {
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const strippedCss = stripCdata(css);
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isCdataWrapped = css !== strippedCss;
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css = strippedCss;
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}
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return postcss([cssnano(cssnanoOptions)]).process(css, postcssOptions).then(result => {
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if (isCdataWrapped) {
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return styleNode.content = ['<![CDATA[' + result + ']]>'];
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}
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return styleNode.content = [result.css];
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});
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}
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function processStyleAttr(node, cssnanoOptions, cssnano, postcss) {
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// CSS "color: red;" is invalid. Therefore it should be wrapped inside some selector:
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// a{color: red;}
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const wrapperStart = 'a{';
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const wrapperEnd = '}';
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const wrappedStyle = wrapperStart + (node.attrs.style || '') + wrapperEnd;
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return postcss([cssnano(cssnanoOptions)]).process(wrappedStyle, postcssOptions).then(result => {
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const minifiedCss = result.css;
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// Remove wrapperStart at the start and wrapperEnd at the end of minifiedCss
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node.attrs.style = minifiedCss.substring(wrapperStart.length, minifiedCss.length - wrapperEnd.length);
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});
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}
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function stripCdata(css) {
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const leftStrippedCss = css.replace('<![CDATA[', '');
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if (leftStrippedCss === css) {
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return css;
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}
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const strippedCss = leftStrippedCss.replace(']]>', '');
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return leftStrippedCss === strippedCss ? css : strippedCss;
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}
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