1 files changed, 10 insertions, 2 deletions
diff --git a/node_modules/clean-css/lib/options/optimization-level.js b/node_modules/clean-css/lib/options/optimization-level.js
index d9828287b..0d3ad7303 100644
--- a/node_modules/clean-css/lib/options/optimization-level.js
+++ b/node_modules/clean-css/lib/options/optimization-level.js
@@ -17,9 +17,9 @@ DEFAULTS[OptimizationLevel.One] = {
   optimizeBackground: true,
   optimizeBorderRadius: true,
   optimizeFilter: true,
-  optimizeFont: true,
   optimizeFontWeight: true,
   optimizeOutline: true,
+  removeEmpty: true,
   removeNegativePaddings: true,
   removeQuotes: true,
   removeWhitespace: true,
@@ -41,11 +41,14 @@ DEFAULTS[OptimizationLevel.Two] = {
   mergeNonAdjacentRules: true,
   mergeSemantically: false,
   overrideProperties: true,
+  removeEmpty: true,
   reduceNonAdjacentRules: true,
   removeDuplicateFontRules: true,
   removeDuplicateMediaBlocks: true,
   removeDuplicateRules: true,
-  restructureRules: false
+  removeUnusedAtRules: false,
+  restructureRules: false,
+  skipProperties: []
 };
 
 var ALL_KEYWORD_1 = '*';
@@ -55,6 +58,7 @@ var FALSE_KEYWORD_2 = 'off';
 var TRUE_KEYWORD_1 = 'true';
 var TRUE_KEYWORD_2 = 'on';
 
+var LIST_VALUE_SEPARATOR = ',';
 var OPTION_SEPARATOR = ';';
 var OPTION_VALUE_SEPARATOR = ':';
 
@@ -99,6 +103,10 @@ function optimizationLevelFrom(source) {
     source[One].roundingPrecision = roundingPrecisionFrom(source[One].roundingPrecision);
   }
 
+  if (Two in source && 'skipProperties' in source[Two] && typeof(source[Two].skipProperties) == 'string') {
+    source[Two].skipProperties = source[Two].skipProperties.split(LIST_VALUE_SEPARATOR);
+  }
+
   if (Zero in source || One in source || Two in source) {
     level[Zero] = override(level[Zero], source[Zero]);
   }