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rOACCT/node_modules/svgo/plugins/moveElemsAttrsToGroup.js
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moveElemsAttrsToGroup.js
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			'use strict';

			const { visit } = require('../lib/xast.js');
			const { inheritableAttrs, pathElems } = require('./_collections.js');

			exports.type = 'visitor';
			exports.name = 'moveElemsAttrsToGroup';
			exports.active = true;
			exports.description = 'Move common attributes of group children to the group';

			/**
			* Move common attributes of group children to the group
			*
			* @example
			* <g attr1="val1">
			* <g attr2="val2">
			* text
			* </g>
			* <circle attr2="val2" attr3="val3"/>
			* </g>
			* ⬇
			* <g attr1="val1" attr2="val2">
			* <g>
			* text
			* </g>
			* <circle attr3="val3"/>
			* </g>
			*
			* @author Kir Belevich
			*
			* @type {import('../lib/types').Plugin<void>}
			*/
			exports.fn = (root) => {
			// find if any style element is present
			let deoptimizedWithStyles = false;
			visit(root, {
			element: {
			enter: (node) => {
			if (node.name === 'style') {
			deoptimizedWithStyles = true;
			}
			},
			},
			});

			return {
			element: {
			exit: (node) => {
			// process only groups with more than 1 children
			if (node.name !== 'g' \|\| node.children.length <= 1) {
			return;
			}

			// deoptimize the plugin when style elements are present
			// selectors may rely on id, classes or tag names
			if (deoptimizedWithStyles) {
			return;
			}

			/**
			* find common attributes in group children
			* @type {Map<string, string>}
			*/
			const commonAttributes = new Map();
			let initial = true;
			let everyChildIsPath = true;
			for (const child of node.children) {
			if (child.type === 'element') {
			if (pathElems.includes(child.name) === false) {
			everyChildIsPath = false;
			}
			if (initial) {
			initial = false;
			// collect all inheritable attributes from first child element
			for (const [name, value] of Object.entries(child.attributes)) {
			// consider only inheritable attributes
			if (inheritableAttrs.includes(name)) {
			commonAttributes.set(name, value);
			}
			}
			} else {
			// exclude uncommon attributes from initial list
			for (const [name, value] of commonAttributes) {
			if (child.attributes[name] !== value) {
			commonAttributes.delete(name);
			}
			}
			}
			}
			}

			// preserve transform on children when group has clip-path or mask
			if (
			node.attributes['clip-path'] != null \|\|
			node.attributes.mask != null
			) {
			commonAttributes.delete('transform');
			}

			// preserve transform when all children are paths
			// so the transform could be applied to path data by other plugins
			if (everyChildIsPath) {
			commonAttributes.delete('transform');
			}

			// add common children attributes to group
			for (const [name, value] of commonAttributes) {
			if (name === 'transform') {
			if (node.attributes.transform != null) {
			node.attributes.transform = `${node.attributes.transform} ${value}`;
			} else {
			node.attributes.transform = value;
			}
			} else {
			node.attributes[name] = value;
			}
			}

			// delete common attributes from children
			for (const child of node.children) {
			if (child.type === 'element') {
			for (const [name] of commonAttributes) {
			delete child.attributes[name];
			}
			}
			}
			},
			},
			};
			};