Fix function-no-unknown false positives for contrast-color() and sibling-*() (#8729)

Mouvedia · web-flow · commit c33479b8e0b2 · 2025-08-14T16:52:39.000+02:00
diff --git a/.changeset/little-rats-lay.md b/.changeset/little-rats-lay.md
@@ -0,0 +1,5 @@
+---
+"stylelint": patch
+---
+
+Fixed: `function-no-unknown` false positives for `contrast-color()` and `sibling-*()`
diff --git a/lib/rules/function-no-unknown/__tests__/index.mjs b/lib/rules/function-no-unknown/__tests__/index.mjs
@@ -61,6 +61,12 @@ testRule({
 		{
 			code: 'a { --color: if(media(width >= 1px): red; else: green); }',
 		},
+		{
+			code: '.foo { --bar: sibling-index(); column-count: sibling-count(); }',
+		},
+		{
+			code: 'a { color: contrast-color(var(--qux)); }',
+		},
 	],
 
 	reject: [
diff --git a/lib/rules/function-no-unknown/index.cjs b/lib/rules/function-no-unknown/index.cjs
diff --git a/lib/rules/function-no-unknown/index.mjs b/lib/rules/function-no-unknown/index.mjs
@@ -27,6 +27,11 @@ const FUNCTIONS = [
 	'content',
 	'running',
 	'string',
+	// https://drafts.csswg.org/css-values-5/#tree-counting
+	'sibling-count',
+	'sibling-index',
+	// https://drafts.csswg.org/css-color-5/#contrast-color
+	'contrast-color',
 ];
 
 const ruleName = 'function-no-unknown';

-Original file line number
+Diff line change
@@ @@ -0,0 +1,5 @@ @@
 +---
 +"stylelint": patch
 +---
++
 +Fixed: `function-no-unknown` false positives for `contrast-color()` and `sibling-*()`