From 6b4dc6309e985f2d97d7f14ffa45e94a2f9d6a91 Mon Sep 17 00:00:00 2001
From: Tmk <i@tmk.im>
Date: Thu, 31 Jul 2025 20:23:56 +0800
Subject: [PATCH] fix(issue#4354): only auto add comma separator for @layer

---
 packages/less/src/less/tree/atrule.js    | 8 ++++----
 packages/test-data/css/_main/apply.css   | 3 +++
 packages/test-data/less/_main/apply.less | 3 +++
 3 files changed, 10 insertions(+), 4 deletions(-)
 create mode 100644 packages/test-data/css/_main/apply.css
 create mode 100644 packages/test-data/less/_main/apply.less

diff --git a/packages/less/src/less/tree/atrule.js b/packages/less/src/less/tree/atrule.js
index df36a5d87..60467a724 100644
--- a/packages/less/src/less/tree/atrule.js
+++ b/packages/less/src/less/tree/atrule.js
@@ -71,9 +71,9 @@ AtRule.prototype = Object.assign(new Node(), {
 
     declarationsBlock(rules, mergeable = false) {
         if (!mergeable) {
-            return rules.filter(function (node) { return (node.type === 'Declaration' || node.type === 'Comment') && !node.merge}).length === rules.length;
+            return rules.every(function (node) { return (node.type === 'Declaration' || node.type === 'Comment') && !node.merge});
         } else {
-            return rules.filter(function (node) { return (node.type === 'Declaration' || node.type === 'Comment'); }).length === rules.length;
+            return rules.every(function (node) { return (node.type === 'Declaration' || node.type === 'Comment'); });
         }
     },
 
@@ -81,7 +81,7 @@ AtRule.prototype = Object.assign(new Node(), {
         if (!Array.isArray(rules)) {
             return false;
         } else { 
-            return rules.filter(function (node) { return (node.type === 'Keyword' || node.type === 'Comment'); }).length === rules.length;
+            return rules.every(function (node) { return (node.type === 'Keyword' || node.type === 'Comment'); });
         }
     },
 
@@ -135,7 +135,7 @@ AtRule.prototype = Object.assign(new Node(), {
 
         if (value) {
             value = value.eval(context);
-            if (value.value && this.keywordList(value.value)) {
+            if (this.name === '@layer' && value.value && this.keywordList(value.value)) {
                 value = new Anonymous(value.value.map(keyword => keyword.value).join(', '), this.getIndex(), this.fileInfo());
             }
         }
diff --git a/packages/test-data/css/_main/apply.css b/packages/test-data/css/_main/apply.css
new file mode 100644
index 000000000..499decb21
--- /dev/null
+++ b/packages/test-data/css/_main/apply.css
@@ -0,0 +1,3 @@
+.box {
+  @apply h-64 w-64;
+}
diff --git a/packages/test-data/less/_main/apply.less b/packages/test-data/less/_main/apply.less
new file mode 100644
index 000000000..499decb21
--- /dev/null
+++ b/packages/test-data/less/_main/apply.less
@@ -0,0 +1,3 @@
+.box {
+  @apply h-64 w-64;
+}