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node_modules/clean-css/lib/optimizer/level-1/property-optimizers/box-shadow.js

@@ -0,0 +1,15 @@
+var plugin = {
+  level1: {
+    property: function boxShadow(_rule, property) {
+      var values = property.value;
+
+      // remove multiple zeros
+      if (values.length == 4 && values[0][1] === '0' && values[1][1] === '0' && values[2][1] === '0' && values[3][1] === '0') {
+        property.value.splice(2);
+        property.dirty = true;
+      }
+    }
+  }
+};
+
+module.exports = plugin;