Fix #11

Author: yuezk

CHANGELOG.md

@@ -1,3 +1,7 @@
+### 0.2.5 - 2016-12-13
+
+- Fixed #11.
+
 ### 0.2.4 - 2016-02-29
 
 - Fixed #8.

index.js

@@ -259,16 +259,17 @@ module.exports = postcss.plugin('postcss-filter-gradient', function (opts) {
             var gradient;
             var filter;
 
-            if (hasFilter(rule)) {
+            gradient = getGradientFromRule(rule);
+
+            // if linear-gradient and `filter` both exist, warn users
+            if (gradient.value && hasFilter(rule)) {
                 rule.warn(
                     result,
                     'The `filter` declaration already exists, we have skipped this rule.'
                 );
                 return;
             }
 
-            gradient = getGradientFromRule(rule);
-
             if (gradient.warnings) {
                 gradient.decl.warn(result, gradient.warnings);
             }

test/fixtures/filter-not-warning.css

@@ -0,0 +1,3 @@
+a {
+    filter: alpha(opacity=50);
+}

test/fixtures/filter-not-warning.expect.css

@@ -0,0 +1,3 @@
+a {
+    filter: alpha(opacity=50);
+}

test/test.js

@@ -48,6 +48,10 @@ describe('postcss-filter-gradient', function () {
         test('filter', {}, done, warnings);
     });
 
+    it('should not waring when linear-gradient does\'nt exists', function (done) {
+        test('filter-not-warning', { }, done);
+    });
+
     it('should do nothing when handle invalid linear gradient syntax', function (done) {
         var warnings = [
             '`linear-gradient()` is not a valid linear gradient value.',