From e5a9c8926fc2ef978118305653d406776c15ccba Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Patrick=20Heller=20=F0=9F=92=A9?= <ph@wacg.de>
Date: Fri, 3 Nov 2017 20:52:16 +0100
Subject: [PATCH] remove empty media queries

---
 __tests__/sanity.test.js               | 8 ++++++++
 src/lib/substituteResponsiveAtRules.js | 6 +++++-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/__tests__/sanity.test.js b/__tests__/sanity.test.js
index 516d425f6..d79bcee57 100644
--- a/__tests__/sanity.test.js
+++ b/__tests__/sanity.test.js
@@ -17,3 +17,11 @@ it('generates the right CSS', () => {
       expect(result.css).toBe(expected)
     })
 })
+
+it('Does not add something if not used at all', () => {
+  return postcss([tailwind()])
+    .process('')
+    .then(result => {
+      expect(result.css).toBe('')
+    })
+})
\ No newline at end of file
diff --git a/src/lib/substituteResponsiveAtRules.js b/src/lib/substituteResponsiveAtRules.js
index 98b306c3f..9e69e9aba 100644
--- a/src/lib/substituteResponsiveAtRules.js
+++ b/src/lib/substituteResponsiveAtRules.js
@@ -29,7 +29,11 @@ export default function(config) {
           return cloned
         })
       )
-      css.append(mediaQuery)
+
+      if(mediaQuery.nodes.length) {
+        // do not add media query without any rules or comments
+        css.append(mediaQuery)
+      }
     })
   }
 }