update node modules

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

@@ -0,0 +1,26 @@
+var OptimizationLevel = require('../../../options/optimization-level').OptimizationLevel;
+
+function isNegative(value) {
+  return value && value[1][0] == '-' && parseFloat(value[1]) < 0;
+}
+
+var plugin = {
+  level1: {
+    property: function padding(_rule, property, options) {
+      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(1);
+        property.dirty = true;
+      }
+
+      // remove negative paddings
+      if (options.level[OptimizationLevel.One].removeNegativePaddings && (isNegative(property.value[0]) || isNegative(property.value[1]) || isNegative(property.value[2]) || isNegative(property.value[3]))) {
+        property.unused = true;
+      }
+    }
+  }
+};
+
+module.exports = plugin;