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node_modules/stylelint/lib/utils/isCustomFunction.cjs

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+// NOTICE: This file is generated by Rollup. To modify it,
+// please instead edit the ESM counterpart and rebuild with Rollup (npm run build).
+'use strict';
+
+/**
+ * Check whether a function is custom / user-defined
+ * https://github.com/w3c/css-houdini-drafts/issues/1007
+ * @param {string} func
+ * @returns {boolean}
+ */
+function isCustomFunction(func) {
+	return func.startsWith('--');
+}
+
+module.exports = isCustomFunction;