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

			/**
			* @typedef {import('../lib/types').XastElement} XastElement
			*/

			const { detachNodeFromParent } = require('../lib/xast.js');
			const { elemsGroups } = require('./_collections.js');

			exports.type = 'visitor';
			exports.name = 'removeUselessDefs';
			exports.active = true;
			exports.description = 'removes elements in <defs> without id';

			/**
			* Removes content of defs and properties that aren't rendered directly without ids.
			*
			* @author Lev Solntsev
			*
			* @type {import('../lib/types').Plugin<void>}
			*/
			exports.fn = () => {
			return {
			element: {
			enter: (node, parentNode) => {
			if (node.name === 'defs') {
			/**
			* @type {Array<XastElement>}
			*/
			const usefulNodes = [];
			collectUsefulNodes(node, usefulNodes);
			if (usefulNodes.length === 0) {
			detachNodeFromParent(node, parentNode);
			}
			// TODO remove in SVGO 3
			for (const usefulNode of usefulNodes) {
			// @ts-ignore parentNode is legacy
			usefulNode.parentNode = node;
			}
			node.children = usefulNodes;
			} else if (
			elemsGroups.nonRendering.includes(node.name) &&
			node.attributes.id == null
			) {
			detachNodeFromParent(node, parentNode);
			}
			},
			},
			};
			};

			/**
			* @type {(node: XastElement, usefulNodes: Array<XastElement>) => void}
			*/
			const collectUsefulNodes = (node, usefulNodes) => {
			for (const child of node.children) {
			if (child.type === 'element') {
			if (child.attributes.id != null \|\| child.name === 'style') {
			usefulNodes.push(child);
			} else {
			collectUsefulNodes(child, usefulNodes);
			}
			}
			}
			};