37 lines
1.1 KiB
JavaScript
37 lines
1.1 KiB
JavaScript
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import { isAmpBoilerplate } from '../helpers.mjs';
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/* Merge multiple <style> into one */
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export default function mergeStyles(tree) {
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const styleNodes = {};
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tree.match({tag: 'style'}, node => {
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const nodeAttrs = node.attrs || {};
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// Skip <style scoped></style>
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// https://developer.mozilla.org/en/docs/Web/HTML/Element/style
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//
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// Also skip SRI, reasons are documented in "minifyJs" module
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if ('scoped' in nodeAttrs || 'integrity' in nodeAttrs) {
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return node;
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}
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if (isAmpBoilerplate(node)) {
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return node;
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}
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const styleType = nodeAttrs.type || 'text/css';
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const styleMedia = nodeAttrs.media || 'all';
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const styleKey = styleType + '_' + styleMedia;
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if (styleNodes[styleKey]) {
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const styleContent = (node.content || []).join(' ');
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styleNodes[styleKey].content.push(' ' + styleContent);
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return '';
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}
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node.content = node.content || [];
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styleNodes[styleKey] = node;
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return node;
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});
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return tree;
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}
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