node_modules/stylelint/lib/utils/getStrippedSelectorSource.mjs

import selectorParser from 'postcss-selector-parser';

const { isComment } = selectorParser;

/**
 * Get the source of a selector, excluding surrounding whitespace and comments.
 *
 * @param {import('postcss-selector-parser').Selector} node
 *
 * @returns {{selector: string, index: number, endIndex: number}}
 */
export default function getStrippedSelectorSource(node) {
	const firstIndex = node.nodes.findIndex((x) => !isComment(x));
	const lastIndex = node.nodes.findLastIndex((x) => !isComment(x));

	const first = node.nodes[firstIndex];
	let last = node.nodes[lastIndex];

	if (!first || !last) {
		const selector = node.toString().trim();
		const index = node.sourceIndex ?? 0;
		const endIndex = index + selector.length;

		return {
			selector,
			index,
			endIndex,
		};
	}

	last = last.rawSpaceAfter.length ? last.clone() : last;
	last.rawSpaceAfter = '';

	let selector = node.nodes.slice(firstIndex, lastIndex).map(String).join('');

	selector += last.toString();
	selector = selector.trim();

	const index = first.sourceIndex ?? 0;
	const endIndex = index + selector.length;

	return {
		selector,
		index,
		endIndex,
	};
}