first commit

node_modules/stylelint/lib/utils/isCustomFunction.mjs

@@ -0,0 +1,9 @@
+/**
+ * Check whether a function is custom / user-defined
+ * https://github.com/w3c/css-houdini-drafts/issues/1007
+ * @param {string} func
+ * @returns {boolean}
+ */
+export default function isCustomFunction(func) {
+	return func.startsWith('--');
+}