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node_modules/stylelint/lib/utils/isMathFunction.mjs

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+import { mathFunctions } from '../reference/functions.mjs';
+
+/**
+ * Check whether a node is math function
+ *
+ * @param {import('postcss-value-parser').Node} node postcss-value-parser node
+ * @returns {boolean} If `true`, the node is math function
+ */
+export default function isMathFunction(node) {
+	return node.type === 'function' && mathFunctions.has(node.value.toLowerCase());
+}