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node_modules/stylelint/lib/utils/isStandardSyntaxCombinator.mjs

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+/**
+ * Check whether a combinator is standard
+ *
+ * @param {import('postcss-selector-parser').Combinator} node postcss-selector-parser node (of type combinator)
+ * @returns {boolean} If `true`, the combinator is standard
+ */
+export default function isStandardSyntaxCombinator(node) {
+	// if it's not a combinator, then it's not a standard combinator
+	if (node.type !== 'combinator') {
+		return false;
+	}
+
+	// Ignore reference combinators like `/deep/`
+	if (node.value.startsWith('/') || node.value.endsWith('/')) {
+		return false;
+	}
+
+	// ignore the combinators that are the first or last node in their container
+	if (node.parent !== undefined && node.parent !== null) {
+		const parent = node.parent;
+
+		if (node === parent.first) {
+			return false;
+		}
+
+		if (node === parent.last) {
+			return false;
+		}
+	}
+
+	return true;
+}