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node_modules/clean-css/lib/optimizer/level-2/properties/has-unset.js

@@ -0,0 +1,9 @@
+function hasUnset(property) {
+  for (var i = property.value.length - 1; i >= 0; i--) {
+    if (property.value[i][1] == 'unset') { return true; }
+  }
+
+  return false;
+}
+
+module.exports = hasUnset;