Fix function-no-unknown performance (#7004)

Co-authored-by: Masafumi Koba <473530+ybiquitous@users.noreply.github.com>
stylelint · Jun 30, 2023 · 354fbfd · 354fbfd
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diff --git a/.changeset/shy-tools-rest.md b/.changeset/shy-tools-rest.md
@@ -0,0 +1,5 @@
+---
+"stylelint": patch
+---
+
+Fixed: `function-no-unknown` performance
diff --git a/lib/rules/function-no-unknown/index.js b/lib/rules/function-no-unknown/index.js
@@ -62,6 +62,8 @@ const rule = (primary, secondaryOptions) => {
 		root.walkDecls((decl) => {
 			const { value } = decl;
 
+			if (!value.includes('(')) return;
+
 			if (!isStandardSyntaxValue(value)) return;
 
 			/**