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

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+var OptimizationLevel = require('../../../options/optimization-level').OptimizationLevel;
+
+var plugin = {
+  level1: {
+    property: function outline(_rule, property, options) {
+      var values = property.value;
+
+      if (!options.level[OptimizationLevel.One].optimizeOutline) {
+        return;
+      }
+
+      if (values.length == 1 && values[0][1] == 'none') {
+        values[0][1] = '0';
+      }
+    }
+  }
+};
+
+module.exports = plugin;