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node_modules/stylelint/lib/utils/isVarFunction.mjs

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+import { isValueFunction } from './typeGuards.mjs';
+
+/**
+ * @param {import('postcss-value-parser').Node} node
+ * @returns {node is import('postcss-value-parser').FunctionNode}
+ */
+export default function isVarFunction(node) {
+	return isValueFunction(node) && node.value.toLowerCase() === 'var';
+}