57 lines
1.7 KiB
JavaScript
57 lines
1.7 KiB
JavaScript
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/* Merge multiple <script> into one */
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export default function mergeScripts (tree) {
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let scriptNodesIndex = {};
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let scriptSrcIndex = 1;
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tree.match({ tag: 'script' }, node => {
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const nodeAttrs = node.attrs || {};
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if (
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'src' in nodeAttrs
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// Skip SRI, reasons are documented in "minifyJs" module
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|| 'integrity' in nodeAttrs
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) {
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scriptSrcIndex++;
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return node;
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}
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const scriptType = nodeAttrs.type || 'text/javascript';
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if (scriptType !== 'text/javascript' && scriptType !== 'application/javascript') {
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return node;
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}
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const scriptKey = JSON.stringify({
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id: nodeAttrs.id,
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class: nodeAttrs.class,
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type: scriptType,
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defer: nodeAttrs.defer !== undefined,
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async: nodeAttrs.async !== undefined,
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index: scriptSrcIndex,
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});
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if (!scriptNodesIndex[scriptKey]) {
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scriptNodesIndex[scriptKey] = [];
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}
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scriptNodesIndex[scriptKey].push(node);
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return node;
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});
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for (const scriptNodes of Object.values(scriptNodesIndex)) {
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let lastScriptNode = scriptNodes.pop();
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scriptNodes.reverse().forEach(scriptNode => {
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let scriptContent = (scriptNode.content || []).join(' ');
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scriptContent = scriptContent.trim();
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if (scriptContent.slice(-1) !== ';') {
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scriptContent += ';';
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}
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lastScriptNode.content = lastScriptNode.content || [];
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lastScriptNode.content.unshift(scriptContent);
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scriptNode.tag = false;
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scriptNode.content = [];
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});
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}
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return tree;
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}
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