minifies and outputcaches the server vars

src/Umbraco.Web/Mvc/MinifyJavaScriptResultAttribute.cs

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+using System.Web;
+using System.Web.Mvc;
+using System.Web.UI;
+using ClientDependency.Core;
+using ClientDependency.Core.CompositeFiles;
+
+namespace Umbraco.Web.Mvc
+{
+    /// <summary>
+    /// Minifies and caches the result for the JavaScriptResult
+    /// </summary>
+    /// <remarks>
+    /// Only minifies in release mode
+    /// </remarks>
+    public class MinifyJavaScriptResultAttribute : ActionFilterAttribute
+    {
+        /// <summary>
+        /// Minify the result if in release mode
+        /// </summary>
+        /// <param name="filterContext"></param>
+        public override void OnResultExecuting(ResultExecutingContext filterContext)
+        {
+            base.OnResultExecuting(filterContext);
+
+            if (filterContext.Result == null) return;
+            var jsResult = filterContext.Result as JavaScriptResult;
+            if (jsResult == null) return;
+            if (filterContext.HttpContext.IsDebuggingEnabled) return;
+            
+            //minify the result
+            var result = jsResult.Script;
+            var minifier = new JSMin();
+            var minified = minifier.Minify(result);            
+            jsResult.Script = minified;
+        }
+
+    }
+}