flow like the river

VISUALIZACION/node_modules/htmlnano/lib/modules/mergeStyles.js

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+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+    value: true
+});
+exports.default = mergeStyles;
+/* Merge multiple <style> into one */
+function mergeStyles(tree) {
+    var styleNodes = {};
+
+    tree.match({ tag: 'style' }, function (node) {
+        var nodeAttrs = node.attrs || {};
+        // Skip <style scoped></style>
+        // https://developer.mozilla.org/en/docs/Web/HTML/Element/style
+        if (nodeAttrs.scoped !== undefined) {
+            return node;
+        }
+
+        var styleType = nodeAttrs.type || 'text/css';
+        var styleMedia = nodeAttrs.media || 'all';
+        var styleKey = styleType + '_' + styleMedia;
+        if (styleNodes[styleKey]) {
+            var styleContent = (node.content || []).join(' ');
+            styleNodes[styleKey].content.push(' ' + styleContent);
+            return '';
+        }
+
+        node.content = node.content || [];
+        styleNodes[styleKey] = node;
+        return node;
+    });
+
+    return tree;
+}