@stylistic/stylelint-plugin/lib/utils/isStandardSyntaxRule/index.js

A collection of stylistic/formatting Stylelint rules

import { isStandardSyntaxSelector } from "../isStandardSyntaxSelector/index.js"

/**
 * Check whether a Node is a standard rule
 *
 * @param {import('postcss').Rule | import('postcss-less').Rule} rule
 * @returns {boolean}
 */
export function isStandardSyntaxRule (rule) {
	if (rule.type !== `rule`) {
		return false
	}

	// Ignore Less &:extend rule
	if (`extend` in rule && rule.extend) {
		return false
	}

	if (!isStandardSyntaxSelector(rule.selector)) {
		return false
	}

	return true
}