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node_modules/stylelint/lib/utils/isStandardSyntaxRule.mjs

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+import isStandardSyntaxSelector from './isStandardSyntaxSelector.mjs';
+
+/**
+ * Check whether a Node is a standard rule
+ *
+ * @param {import('postcss').Rule | import('postcss-less').Rule} rule
+ * @returns {boolean}
+ */
+export default 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;
+}