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

			const { visit, visitSkip, detachNodeFromParent } = require('../lib/xast.js');
			const { collectStylesheet, computeStyle } = require('../lib/style.js');
			const { elemsGroups } = require('./_collections.js');

			exports.type = 'visitor';
			exports.name = 'removeUselessStrokeAndFill';
			exports.active = true;
			exports.description = 'removes useless stroke and fill attributes';

			/**
			* Remove useless stroke and fill attrs.
			*
			* @author Kir Belevich
			*
			* @type {import('../lib/types').Plugin<{
			* stroke?: boolean,
			* fill?: boolean,
			* removeNone?: boolean
			* }>}
			*/
			exports.fn = (root, params) => {
			const {
			stroke: removeStroke = true,
			fill: removeFill = true,
			removeNone = false,
			} = params;

			// style and script elements deoptimise this plugin
			let hasStyleOrScript = false;
			visit(root, {
			element: {
			enter: (node) => {
			if (node.name === 'style' \|\| node.name === 'script') {
			hasStyleOrScript = true;
			}
			},
			},
			});
			if (hasStyleOrScript) {
			return null;
			}

			const stylesheet = collectStylesheet(root);

			return {
			element: {
			enter: (node, parentNode) => {
			// id attribute deoptimise the whole subtree
			if (node.attributes.id != null) {
			return visitSkip;
			}
			if (elemsGroups.shape.includes(node.name) == false) {
			return;
			}
			const computedStyle = computeStyle(stylesheet, node);
			const stroke = computedStyle.stroke;
			const strokeOpacity = computedStyle['stroke-opacity'];
			const strokeWidth = computedStyle['stroke-width'];
			const markerEnd = computedStyle['marker-end'];
			const fill = computedStyle.fill;
			const fillOpacity = computedStyle['fill-opacity'];
			const computedParentStyle =
			parentNode.type === 'element'
			? computeStyle(stylesheet, parentNode)
			: null;
			const parentStroke =
			computedParentStyle == null ? null : computedParentStyle.stroke;

			// remove stroke*
			if (removeStroke) {
			if (
			stroke == null \|\|
			(stroke.type === 'static' && stroke.value == 'none') \|\|
			(strokeOpacity != null &&
			strokeOpacity.type === 'static' &&
			strokeOpacity.value === '0') \|\|
			(strokeWidth != null &&
			strokeWidth.type === 'static' &&
			strokeWidth.value === '0')
			) {
			// stroke-width may affect the size of marker-end
			// marker is not visible when stroke-width is 0
			if (
			(strokeWidth != null &&
			strokeWidth.type === 'static' &&
			strokeWidth.value === '0') \|\|
			markerEnd == null
			) {
			for (const name of Object.keys(node.attributes)) {
			if (name.startsWith('stroke')) {
			delete node.attributes[name];
			}
			}
			// set explicit none to not inherit from parent
			if (
			parentStroke != null &&
			parentStroke.type === 'static' &&
			parentStroke.value !== 'none'
			) {
			node.attributes.stroke = 'none';
			}
			}
			}
			}

			// remove fill*
			if (removeFill) {
			if (
			(fill != null && fill.type === 'static' && fill.value === 'none') \|\|
			(fillOpacity != null &&
			fillOpacity.type === 'static' &&
			fillOpacity.value === '0')
			) {
			for (const name of Object.keys(node.attributes)) {
			if (name.startsWith('fill-')) {
			delete node.attributes[name];
			}
			}
			if (
			fill == null \|\|
			(fill.type === 'static' && fill.value !== 'none')
			) {
			node.attributes.fill = 'none';
			}
			}
			}

			if (removeNone) {
			if (
			(stroke == null \|\| node.attributes.stroke === 'none') &&
			((fill != null &&
			fill.type === 'static' &&
			fill.value === 'none') \|\|
			node.attributes.fill === 'none')
			) {
			detachNodeFromParent(node, parentNode);
			}
			}
			},
			},
			};
			};