From 76a821fcf5e2ebec4a3238f1ab38c6a5fce9da64 Mon Sep 17 00:00:00 2001
From: Roman Dvornov <rdvornov@gmail.com>
Date: Mon, 21 Mar 2016 01:54:47 +0300
Subject: [PATCH] scopes in usage data should not affect classes

---
 lib/compressor/usage.js |  6 +-----
 test/usage.js           | 23 +++++++++++++++++++++++
 2 files changed, 24 insertions(+), 5 deletions(-)

diff --git a/lib/compressor/usage.js b/lib/compressor/usage.js
index 62955147..b1313a38 100644
--- a/lib/compressor/usage.js
+++ b/lib/compressor/usage.js
@@ -15,7 +15,6 @@ function buildMap(list) {
 }
 
 function buildIndex(data) {
-    var classes = buildMap(data.classes);
     var scopes = false;
 
     if (data.scopes && Array.isArray(data.scopes)) {
@@ -36,9 +35,6 @@ function buildIndex(data) {
                 }
 
                 scopes[name] = i + 1;
-                if (classes) {
-                    classes[name] = true;
-                }
             }
         }
     }
@@ -46,7 +42,7 @@ function buildIndex(data) {
     return {
         tags: buildMap(data.tags),
         ids: buildMap(data.ids),
-        classes: classes,
+        classes: buildMap(data.classes),
         scopes: scopes
     };
 }
diff --git a/test/usage.js b/test/usage.js
index 14959184..f03542a0 100644
--- a/test/usage.js
+++ b/test/usage.js
@@ -33,6 +33,29 @@ describe('compress with usage', function() {
         assert.equal(compressed, '*{p:1}');
     });
 
+    describe('shouldn\'t affect classes whitelist', function() {
+        it('when "classes" is defined', function() {
+            var compressed = csso.minify('.a, .b { p: 1 }', {
+                usage: {
+                    classes: ['a'],
+                    scopes: [['a'], ['b']]
+                }
+            });
+
+            assert.equal(compressed, '.a{p:1}');
+        });
+
+        it('when "classes" isn\'t defined', function() {
+            var compressed = csso.minify('.a, .b { p: 1 }', {
+                usage: {
+                    scopes: [['a'], ['b']]
+                }
+            });
+
+            assert.equal(compressed, '.a,.b{p:1}');
+        });
+    });
+
     it('should throw exception when selector has classes from different scopes', function() {
         assert.throws(function() {
             csso.minify('.a.b { p: 1 }', {