fix(postcss-discard-empty): preserve empty layer declarations

Fix #1544
cssnano · Feb 22, 2024 · 4bf74ef · 4bf74ef
1 parent 52d14d8
commit 4bf74ef
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diff --git a/.changeset/neat-houses-trade.md b/.changeset/neat-houses-trade.md
@@ -0,0 +1,5 @@
+---
+"postcss-discard-empty": patch
+---
+
+fix(postcss-discard-empty): preserve empty layer declarations
diff --git a/packages/postcss-discard-empty/src/index.js b/packages/postcss-discard-empty/src/index.js
@@ -21,7 +21,7 @@ function discardAndReport(css, result) {
     if (
       (type === 'decl' && !node.value && !node.prop.startsWith('--')) ||
       (type === 'rule' && !node.selector) ||
-      (sub && !sub.length) ||
+      (sub && !sub.length && !(type === 'atrule' && node.name === 'layer')) ||
       (type === 'atrule' &&
         ((!sub && !node.params) ||
           (!node.params &&

diff --git a/packages/postcss-discard-empty/test/index.js b/packages/postcss-discard-empty/test/index.js
@@ -85,6 +85,24 @@ test(
   passthroughCSS('*{--tw-shadow:; --something-else: ;}')
 );
 
+test(
+  'should preserve empty layers',
+  passthroughCSS(`@layer a {}
+@layer b {}
+
+@layer b {
+  foo {
+    color: red;
+  }
+}
+
+@layer a {
+  bar {
+    color: green;
+  }
+}`)
+);
+
 test(
   'should report removed selectors',
   testRemovals('h1{}.hot{}.a.b{}{}@media screen, print{h1,h2{}}', '', [