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node_modules/stylelint/lib/utils/getSelectorSourceIndex.mjs

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+/**
+ * Get the source index of a selector, excluding leading whitespace.
+ *
+ * @param {import('postcss-selector-parser').Selector} node
+ *
+ * @returns {number}
+ */
+export default function getSelectorSourceIndex(node) {
+	// The first child node sourceIndex is the same as the parent sourceIndex without leading whitespace
+	// If the node doesn't have any children, use the node sourceIndex instead
+	return node.first?.sourceIndex ?? node.sourceIndex;
+}