From d8998a1998cfd73b85888e868b6ad5f807e2445c Mon Sep 17 00:00:00 2001
From: Jordan Pittman <jordan@cryptica.me>
Date: Tue, 11 Jul 2023 15:42:52 -0400
Subject: [PATCH 1/2] Allow variant to be an at-rule without a prelude

---
 src/lib/setupContextUtils.js |  4 ++--
 tests/variants.test.js       | 25 +++++++++++++++++++++++++
 2 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/src/lib/setupContextUtils.js b/src/lib/setupContextUtils.js
index fe2191b7d5fa..00b05652af0d 100644
--- a/src/lib/setupContextUtils.js
+++ b/src/lib/setupContextUtils.js
@@ -231,8 +231,8 @@ export function parseVariant(variant) {
         return ({ format }) => format(str)
       }
 
-      let [, name, params] = /@(.*?)( .+|[({].*)/g.exec(str)
-      return ({ wrap }) => wrap(postcss.atRule({ name, params: params.trim() }))
+      let [, name, params] = /@(\S*)( .+|[({].*)?/g.exec(str)
+      return ({ wrap }) => wrap(postcss.atRule({ name, params: params?.trim() ?? '' }))
     })
     .reverse()
 
diff --git a/tests/variants.test.js b/tests/variants.test.js
index f2a2de075acd..51980d8a09dd 100644
--- a/tests/variants.test.js
+++ b/tests/variants.test.js
@@ -54,6 +54,31 @@ test('order matters and produces different behaviour', () => {
 })
 
 describe('custom advanced variants', () => {
+  test('at-rules without params', () => {
+    let config = {
+      content: [
+        {
+          raw: html` <div class="ogre:text-center"></div> `,
+        },
+      ],
+      plugins: [
+        function ({ addVariant }) {
+          addVariant('ogre', '@layer')
+        },
+      ],
+    }
+
+    return run('@tailwind components; @tailwind utilities', config).then((result) => {
+      return expect(result.css).toMatchFormattedCss(css`
+        @layer {
+          .ogre\:text-center {
+            text-align: center;
+          }
+        }
+      `)
+    })
+  })
+
   test('prose-headings usage on its own', () => {
     let config = {
       content: [

From 01a4a4976a8e51dd86aef74918ed4cbb0eed347e Mon Sep 17 00:00:00 2001
From: Jordan Pittman <jordan@cryptica.me>
Date: Tue, 11 Jul 2023 15:49:21 -0400
Subject: [PATCH 2/2] Update changelog

---
 CHANGELOG.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index a9265922bc08..f3897a901548 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,6 +22,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Sort classes using position of first matching rule ([#11504](https://github.com/tailwindlabs/tailwindcss/pull/11504))
 - Bump `jiti`, `lightningcss`, `fast-glob` and `browserlist` dependencies and reflect `lightningcss` related improvements in tests ([#11550](https://github.com/tailwindlabs/tailwindcss/pull/11550))
 - Make PostCSS plugin async to improve performance ([#11548](https://github.com/tailwindlabs/tailwindcss/pull/11548))
+- Allow variant to be an at-rule without a prelude ([#11589](https://github.com/tailwindlabs/tailwindcss/pull/11589))
 
 ### Added