diff --git a/Builtins.cs b/Builtins.cs
index 84ef586..c5a98e8 100644
--- a/Builtins.cs
+++ b/Builtins.cs
@@ -11,9 +11,9 @@ public sealed class JSGlobal {
         /// Retrieves a name from the global namespace (note that this is the global namespace at the time that the JSIL runtime was loaded).
         /// </summary>
         /// <param name="name">The name to retrieve. This may be a literal, or a string-producing expression.</param>
-        public dynamic this[string name] {
+        public JsObject this[string name] {
             get {
-                return null;
+                throw new NotSupportedException("Not available outside JS");
             }
         }
     }
@@ -23,9 +23,9 @@ public sealed class JSLocal {
         /// Retrieves a name from the local namespace.
         /// </summary>
         /// <param name="name">The name to retrieve. This must be a string literal!</param>
-        public dynamic this[string name] {
+        public JsObject this[string name] {
             get {
-                return null;
+                throw new NotSupportedException("Not available outside JS");
             }
         }
     }
@@ -35,16 +35,16 @@ public static class Builtins {
         public static readonly JSLocal Local = new JSLocal();
 
         /// <summary>
-        /// When running as C#, this method does nothing and returns null.
+        /// When running as C#, this method throws NotSupportedException.
         /// When running as JavaScript, this method call is replaced with an invocation of the builtin javascript eval function.
         /// </summary>
         /// <param name="expression">The expression to evaluate.</param>
-        public static dynamic Eval (string expression) {
-            return null;
+        public static JsObject Eval (string expression) {
+            throw new NotSupportedException("Not available outside JS");
         }
 
         /// <summary>
-        /// When running as C#, this method does nothing and returns null.
+        /// When running as C#, this method throws NotSupportedException.
         /// When running as JavaScript, this method call is replaced with an invocation of the builtin JSIL CreateNamedFunction utility.
         /// </summary>
         public static T CreateNamedFunction<T> (
@@ -53,7 +53,7 @@ public static T CreateNamedFunction<T> (
             string body,
             object closure = null
         ) {
-            throw new NotImplementedException("Not available outside JS");
+            throw new NotSupportedException("Not available outside JS");
         }
 
         public static bool IsTruthy (dynamic value) {
@@ -67,9 +67,9 @@ public static bool IsFalsy (dynamic value) {
         /// <summary>
         /// When running as javascript, this property evaluates to the current scope's this-reference.
         /// </summary>
-        public static dynamic This {
+        public static JsObject This {
             get {
-                return null;
+                throw new NotSupportedException("Not available outside JS");
             }
         }
 
@@ -89,7 +89,7 @@ public static class Services {
         /// When running as JavaScript this method returns a reference to the named runtime service.
         /// </summary>
         /// <param name="serviceName">The name of the runtime service.</param>
-        public static dynamic Get (string serviceName, bool throwIfMissing = true) {
+        public static JsObject Get (string serviceName, bool throwIfMissing = true) {
             if (throwIfMissing)
                 throw new NotImplementedException("Services.get is only available at runtime and you passed true for throwIfMissing.");
             else
diff --git a/JSObject.cs b/JSObject.cs
new file mode 100644
index 0000000..2e06598
--- /dev/null
+++ b/JSObject.cs
@@ -0,0 +1,247 @@
+#pragma warning disable 1591
+namespace JSIL {
+    using System;
+
+    using JSIL.Meta;
+
+    public class JsObject
+    {
+        private JsObject()
+        {
+        }
+
+        //Should work same as Builtins.Global[key]
+        public static JsObject Global(string key)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        public sealed class JsFunction : JsObject
+        {
+            private JsFunction() : base()
+            {
+            }
+        }
+    }
+
+    public static class JsObjectHelpers
+    {
+        [JSReplacement("$target[$key]")]
+        public static JsObject Get(this JsObject target, string key)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        [JSReplacement("($target[$key] = $value)")]
+        public static void Set<TValue>(this JsObject target, string key, TValue value)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        [JSReplacement("($key in $target)")]
+        public static bool In(this JsObject target, string key)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        [JSReplacement("(delete $target[$key])")]
+        public static void Delete(this JsObject target, string key)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        [JSReplacement("$target[$key]()")]
+        public static JsObject Call(this JsObject.JsFunction target, string key)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        [JSReplacement("$target[$key]($arg1)")]
+        public static JsObject Call<TArg1>(this JsObject.JsFunction target, string key, TArg1 arg1)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        [JSReplacement("$target[$key]($arg1, $arg2)")]
+        public static JsObject Call<TArg1, TArg2>(this JsObject.JsFunction target, string key, TArg1 arg1, TArg2 arg2)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        [JSReplacement("$target[$key]($arg1, $arg2, $arg3)")]
+        public static JsObject Call<TArg1, TArg2, TArg3>(this JsObject.JsFunction target, string key, TArg1 arg1, TArg2 arg2, TArg3 arg3)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        [JSReplacement("$target[$key]($arg1, $arg2, $arg3, $arg4)")]
+        public static JsObject Call<TArg1, TArg2, TArg3, TArg4>(this JsObject.JsFunction target, string key, TArg1 arg1, TArg2 arg2, TArg3 arg3, TArg4 arg4)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        [JSReplacement("$target[$key]($arg1, $arg2, $arg3, $arg4, $arg5)")]
+        public static JsObject Call<TArg1, TArg2, TArg3, TArg4, TArg5>(this JsObject.JsFunction target, string key, TArg1 arg1, TArg2 arg2, TArg3 arg3, TArg4 arg4, TArg5 arg5)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        [JSReplacement("$target[$key]($arg1, $arg2, $arg3, $arg4, $arg5, $arg6)")]
+        public static JsObject Call<TArg1, TArg2, TArg3, TArg4, TArg5, TArg6>(this JsObject.JsFunction target, string key, TArg1 arg1, TArg2 arg2, TArg3 arg3, TArg4 arg4, TArg5 arg5, TArg6 arg6)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        [JSReplacement("$target[$key]($arg1, $arg2, $arg3, $arg4, $arg5, $arg6, $arg7)")]
+        public static JsObject Call<TArg1, TArg2, TArg3, TArg4, TArg5, TArg6, TArg7>(this JsObject.JsFunction target, string key, TArg1 arg1, TArg2 arg2, TArg3 arg3, TArg4 arg4, TArg5 arg5, TArg6 arg6, TArg7 arg7)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        [JSReplacement("$target[$key]($arg1, $arg2, $arg3, $arg4, $arg5, $arg6, $arg7, $arg8)")]
+        public static JsObject Call<TArg1, TArg2, TArg3, TArg4, TArg5, TArg6, TArg7, TArg8>(this JsObject.JsFunction target, string key, TArg1 arg1, TArg2 arg2, TArg3 arg3, TArg4 arg4, TArg5 arg5, TArg6 arg6, TArg7 arg7, TArg8 arg8)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        [JSReplacement("$target.call(null)")]
+        public static JsObject Invoke(this JsObject.JsFunction target)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        [JSReplacement("$target.call(null, $arg1)")]
+        public static JsObject Invoke<TArg1>(this JsObject.JsFunction target, TArg1 arg1)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        [JSReplacement("$target.call(null, $arg1, $arg2)")]
+        public static JsObject Invoke<TArg1, TArg2>(this JsObject.JsFunction target, TArg1 arg1, TArg2 arg2)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        [JSReplacement("$target.call(null, $arg1, $arg2, $arg3)")]
+        public static JsObject Invoke<TArg1, TArg2, TArg3>(this JsObject.JsFunction target, TArg1 arg1, TArg2 arg2, TArg3 arg3)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        [JSReplacement("$target.call(null, $arg1, $arg2, $arg3, $arg4)")]
+        public static JsObject Invoke<TArg1, TArg2, TArg3, TArg4>(this JsObject.JsFunction target, TArg1 arg1, TArg2 arg2, TArg3 arg3, TArg4 arg4)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        [JSReplacement("$target.call(null, $arg1, $arg2, $arg3, $arg4, $arg5)")]
+        public static JsObject Invoke<TArg1, TArg2, TArg3, TArg4, TArg5>(this JsObject.JsFunction target, TArg1 arg1, TArg2 arg2, TArg3 arg3, TArg4 arg4, TArg5 arg5)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        [JSReplacement("$target.call(null, $arg1, $arg2, $arg3, $arg4, $arg5, $arg6)")]
+        public static JsObject Invoke<TArg1, TArg2, TArg3, TArg4, TArg5, TArg6>(this JsObject.JsFunction target, TArg1 arg1, TArg2 arg2, TArg3 arg3, TArg4 arg4, TArg5 arg5, TArg6 arg6)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        [JSReplacement("$target.call(null, $arg1, $arg2, $arg3, $arg4, $arg5, $arg6, $arg7)")]
+        public static JsObject Invoke<TArg1, TArg2, TArg3, TArg4, TArg5, TArg6, TArg7>(this JsObject.JsFunction target, TArg1 arg1, TArg2 arg2, TArg3 arg3, TArg4 arg4, TArg5 arg5, TArg6 arg6, TArg7 arg7)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        [JSReplacement("$target.call(null, $arg1, $arg2, $arg3, $arg4, $arg5, $arg6, $arg7, $arg8)")]
+        public static JsObject Invoke<TArg1, TArg2, TArg3, TArg4, TArg5, TArg6, TArg7, TArg8>(this JsObject.JsFunction target, TArg1 arg1, TArg2 arg2, TArg3 arg3, TArg4 arg4, TArg5 arg5, TArg6 arg6, TArg7 arg7, TArg8 arg8)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        [JSReplacement("new $target()")]
+        public static JsObject New(this JsObject.JsFunction target)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        [JSReplacement("new $target($arg1)")]
+        public static JsObject New<TArg1>(this JsObject.JsFunction target, TArg1 arg1)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        [JSReplacement("new $target($arg1, $arg2)")]
+        public static JsObject New<TArg1, TArg2>(this JsObject.JsFunction target, TArg1 arg1, TArg2 arg2)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        [JSReplacement("new $target($arg1, $arg2, $arg3)")]
+        public static JsObject New<TArg1, TArg2, TArg3>(this JsObject.JsFunction target, TArg1 arg1, TArg2 arg2, TArg3 arg3)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        [JSReplacement("new $target($arg1, $arg2, $arg3, $arg4)")]
+        public static JsObject New<TArg1, TArg2, TArg3, TArg4>(this JsObject.JsFunction target, TArg1 arg1, TArg2 arg2, TArg3 arg3, TArg4 arg4)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        [JSReplacement("new $target($arg1, $arg2, $arg3, $arg4, $arg5)")]
+        public static JsObject New<TArg1, TArg2, TArg3, TArg4, TArg5>(this JsObject.JsFunction target, TArg1 arg1, TArg2 arg2, TArg3 arg3, TArg4 arg4, TArg5 arg5)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        [JSReplacement("new $target($arg1, $arg2, $arg3, $arg4, $arg5, $arg6)")]
+        public static JsObject New<TArg1, TArg2, TArg3, TArg4, TArg5, TArg6>(this JsObject.JsFunction target, TArg1 arg1, TArg2 arg2, TArg3 arg3, TArg4 arg4, TArg5 arg5, TArg6 arg6)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        [JSReplacement("new $target($arg1, $arg2, $arg3, $arg4, $arg5, $arg6, $arg7)")]
+        public static JsObject New<TArg1, TArg2, TArg3, TArg4, TArg5, TArg6, TArg7>(this JsObject.JsFunction target, TArg1 arg1, TArg2 arg2, TArg3 arg3, TArg4 arg4, TArg5 arg5, TArg6 arg6, TArg7 arg7)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        [JSReplacement("new $target($arg1, $arg2, $arg3, $arg4, $arg5, $arg6, $arg7, $arg8)")]
+        public static JsObject New<TArg1, TArg2, TArg3, TArg4, TArg5, TArg6, TArg7, TArg8>(this JsObject.JsFunction target, TArg1 arg1, TArg2 arg2, TArg3 arg3, TArg4 arg4, TArg5 arg5, TArg6 arg6, TArg7 arg7, TArg8 arg8)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+
+        [JSReplacement("$obj")]
+        public static T AssumeType<T>(this JsObject obj)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        [JSReplacement("$T.$$As($obj)")]
+        public static T As<T>(this JsObject obj) where T : class
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        [JSReplacement("$T.$$Cast($obj)")]
+        public static T Cast<T>(this JsObject obj)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        [JSReplacement("$T.$$Is($obj)")]
+        public static bool Is<T>(this JsObject obj)
+        {
+            throw new NotSupportedException("Not available outside JS");
+        }
+
+        // Will wrap JS object in adapter, that implement interface T
+        // If T is not interface, than work same as Cast 
+        //public static T Adapt<T>(this JsObject obj)
+        //{
+        //    throw new NotSupportedException("Not available outside JS");
+        //}
+    }
+}
diff --git a/Meta.csproj b/Meta.csproj
index f182b8d..23b517b 100644
--- a/Meta.csproj
+++ b/Meta.csproj
@@ -43,6 +43,7 @@
   <ItemGroup>
     <Compile Include="Attributes.cs" />
     <Compile Include="Builtins.cs" />
+    <Compile Include="JSObject.cs" />
     <Compile Include="PackedArray.cs" />
     <Compile Include="StaticAnalysis.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
diff --git a/Verbatim.cs b/Verbatim.cs
index 2238738..6d50186 100644
--- a/Verbatim.cs
+++ b/Verbatim.cs
@@ -10,196 +10,41 @@
 namespace JSIL {
     public static class Verbatim {
         /// <summary>
-        /// When running as C#, this method does nothing and returns null.
+        /// When running as C#, this method throws NotSupportedException.
         /// When running as JavaScript, the passed-in script code replaces this method call.
         /// </summary>
         /// <param name="javascript">The script expression.</param>
-        public static dynamic Expression (string javascript) {
-            return null;
+        public static JsObject Expression (string javascript) {
+            throw new NotSupportedException("Not available outside JS");
         }
 
         /// <summary>
-        /// When running as C#, this method does nothing and returns null.
-        /// When running as JavaScript, the passed-in script code replaces this method call.
-        /// Variables can be referenced by index. '$0' is the first variable.
-        /// </summary>
-        /// <param name="javascript">The script expression.</param>
-        /// <param name="variables">The variables to insert into the expression.</param>
-        public static dynamic Expression (string javascript, params object[] variables) {
-            return null;
-        }
-
-        /// <summary>
-        /// When running as C#, this method does nothing and returns null.
-        /// When running as JavaScript, the passed-in script code replaces this method call.
-        /// Variables can be referenced by index. '$0' is the first variable.
-        /// </summary>
-        /// <param name="javascript">The script expression.</param>
-        /// <param name="arg0">The variables to insert into '$0' placeholder in the expression.</param>
-        public static dynamic Expression<TArg0>(string javascript, TArg0 arg0)
-        {
-            return null;
-        }
-
-        /// <summary>
-        /// When running as C#, this method does nothing and returns null.
-        /// When running as JavaScript, the passed-in script code replaces this method call.
-        /// Variables can be referenced by index. '$0' is the first variable.
-        /// </summary>
-        /// <param name="javascript">The script expression.</param>
-        /// <param name="arg0">The variables to insert into '$0' placeholder in the expression.</param>
-        /// <param name="arg1">The variables to insert into '$1' placeholder in the expression.</param>
-        public static dynamic Expression<TArg0, TArg1>(string javascript, TArg0 arg0, TArg1 arg1)
-        {
-            return null;
-        }
-
-        /// <summary>
-        /// When running as C#, this method does nothing and returns null.
-        /// When running as JavaScript, the passed-in script code replaces this method call.
-        /// Variables can be referenced by index. '$0' is the first variable.
-        /// </summary>
-        /// <param name="javascript">The script expression.</param>
-        /// <param name="arg0">The variables to insert into '$0' placeholder in the expression.</param>
-        /// <param name="arg1">The variables to insert into '$1' placeholder in the expression.</param>
-        /// <param name="arg2">The variables to insert into '$2' placeholder in the expression.</param>
-        public static dynamic Expression<TArg0, TArg1, TArg2>(string javascript, TArg0 arg0, TArg1 arg1, TArg2 arg2)
-        {
-            return null;
-        }
-
-        /// <summary>
-        /// When running as C#, this method does nothing and returns null.
-        /// When running as JavaScript, the passed-in script code replaces this method call.
-        /// Variables can be referenced by index. '$0' is the first variable.
-        /// </summary>
-        /// <param name="javascript">The script expression.</param>
-        /// <param name="arg0">The variables to insert into '$0' placeholder in the expression.</param>
-        /// <param name="arg1">The variables to insert into '$1' placeholder in the expression.</param>
-        /// <param name="arg2">The variables to insert into '$2' placeholder in the expression.</param>
-        /// <param name="arg3">The variables to insert into '$3' placeholder in the expression.</param>
-        public static dynamic Expression<TArg0, TArg1, TArg2, TArg3>(string javascript, TArg0 arg0, TArg1 arg1, TArg2 arg2, TArg3 arg3)
-        {
-            return null;
-        }
-
-        /// <summary>
-        /// When running as C#, this method does nothing and returns null.
-        /// When running as JavaScript, the passed-in script code replaces this method call.
-        /// Variables can be referenced by index. '$0' is the first variable.
-        /// </summary>
-        /// <param name="javascript">The script expression.</param>
-        /// <param name="arg0">The variables to insert into '$0' placeholder in the expression.</param>
-        /// <param name="arg1">The variables to insert into '$1' placeholder in the expression.</param>
-        /// <param name="arg2">The variables to insert into '$2' placeholder in the expression.</param>
-        /// <param name="arg3">The variables to insert into '$3' placeholder in the expression.</param>
-        /// <param name="arg4">The variables to insert into '$4' placeholder in the expression.</param>
-        public static dynamic Expression<TArg0, TArg1, TArg2, TArg3, TArg4>(string javascript, TArg0 arg0, TArg1 arg1, TArg2 arg2, TArg3 arg3, TArg4 arg4)
-        {
-            return null;
-        }
-
-        /// <summary>
-        /// When running as C#, this method does nothing and returns null.
-        /// When running as JavaScript, the passed-in script code replaces this method call.
-        /// Variables can be referenced by index. '$0' is the first variable.
-        /// </summary>
-        /// <param name="javascript">The script expression.</param>
-        /// <param name="arg0">The variables to insert into '$0' placeholder in the expression.</param>
-        /// <param name="arg1">The variables to insert into '$1' placeholder in the expression.</param>
-        /// <param name="arg2">The variables to insert into '$2' placeholder in the expression.</param>
-        /// <param name="arg3">The variables to insert into '$3' placeholder in the expression.</param>
-        /// <param name="arg4">The variables to insert into '$4' placeholder in the expression.</param>
-        /// <param name="arg5">The variables to insert into '$5' placeholder in the expression.</param>
-        public static dynamic Expression<TArg0, TArg1, TArg2, TArg3, TArg4, TArg5>(string javascript, TArg0 arg0, TArg1 arg1, TArg2 arg2, TArg3 arg3, TArg4 arg4, TArg5 arg5)
-        {
-            return null;
-        }
-
-        /// <summary>
-        /// When running as C#, this method does nothing and returns null.
-        /// When running as JavaScript, the passed-in script code replaces this method call.
-        /// Variables can be referenced by index. '$0' is the first variable.
-        /// </summary>
-        /// <param name="javascript">The script expression.</param>
-        /// <param name="arg0">The variables to insert into '$0' placeholder in the expression.</param>
-        /// <param name="arg1">The variables to insert into '$1' placeholder in the expression.</param>
-        /// <param name="arg2">The variables to insert into '$2' placeholder in the expression.</param>
-        /// <param name="arg3">The variables to insert into '$3' placeholder in the expression.</param>
-        /// <param name="arg4">The variables to insert into '$4' placeholder in the expression.</param>
-        /// <param name="arg5">The variables to insert into '$5' placeholder in the expression.</param>
-        /// <param name="arg6">The variables to insert into '$6' placeholder in the expression.</param>
-        public static dynamic Expression<TArg0, TArg1, TArg2, TArg3, TArg4, TArg5, TArg6>(string javascript, TArg0 arg0, TArg1 arg1, TArg2 arg2, TArg3 arg3, TArg4 arg4, TArg5 arg5, TArg6 arg6)
-        {
-            return null;
-        }
-
-        /// <summary>
-        /// When running as C#, this method does nothing and returns null.
-        /// When running as JavaScript, the passed-in script code replaces this method call.
-        /// Variables can be referenced by index. '$0' is the first variable.
-        /// </summary>
-        /// <param name="javascript">The script expression.</param>
-        /// <param name="arg0">The variables to insert into '$0' placeholder in the expression.</param>
-        /// <param name="arg1">The variables to insert into '$1' placeholder in the expression.</param>
-        /// <param name="arg2">The variables to insert into '$2' placeholder in the expression.</param>
-        /// <param name="arg3">The variables to insert into '$3' placeholder in the expression.</param>
-        /// <param name="arg4">The variables to insert into '$4' placeholder in the expression.</param>
-        /// <param name="arg5">The variables to insert into '$5' placeholder in the expression.</param>
-        /// <param name="arg6">The variables to insert into '$6' placeholder in the expression.</param>
-        /// <param name="arg7">The variables to insert into '$7' placeholder in the expression.</param>
-        public static dynamic Expression<TArg0, TArg1, TArg2, TArg3, TArg4, TArg5, TArg6, TArg7>(string javascript, TArg0 arg0, TArg1 arg1, TArg2 arg2, TArg3 arg3, TArg4 arg4, TArg5 arg5, TArg6 arg6, TArg7 arg7)
-        {
-            return null;
-        }
-
-        /// <summary>
-        /// When running as C#, this method does nothing and returns null.
-        /// When running as JavaScript, the passed-in script code replaces this method call.
-        /// </summary>
-        /// <param name="javascript">The script expression.</param>
-        public static T Expression<T> (string javascript) {
-            return default(T);
-        }
-
-        /// <summary>
-        /// When running as C#, this method does nothing and returns null.
-        /// When running as JavaScript, the passed-in script code replaces this method call.
-        /// Variables can be referenced by index. '$0' is the first variable.
-        /// </summary>
-        /// <param name="javascript">The script expression.</param>
-        /// <param name="variables">The variables to insert into the expression.</param>
-        public static T Expression<T> (string javascript, params object[] variables) {
-            return default(T);
-        }
-
-        /// <summary>
-        /// When running as C#, this method does nothing and returns null.
+        /// When running as C#, this method throws NotSupportedException.
         /// When running as JavaScript, the passed-in script code replaces this method call.
         /// Variables can be referenced by index. '$0' is the first variable.
         /// </summary>
         /// <param name="javascript">The script expression.</param>
         /// <param name="arg0">The variables to insert into '$0' placeholder in the expression.</param>
-        public static TResult Expression<TArg0, TResult>(string javascript, TArg0 arg0)
+        public static JsObject Expression<TArg0>(string javascript, TArg0 arg0)
         {
-            return default(TResult);
+            throw new NotSupportedException("Not available outside JS");
         }
 
         /// <summary>
-        /// When running as C#, this method does nothing and returns null.
+        /// When running as C#, this method throws NotSupportedException.
         /// When running as JavaScript, the passed-in script code replaces this method call.
         /// Variables can be referenced by index. '$0' is the first variable.
         /// </summary>
         /// <param name="javascript">The script expression.</param>
         /// <param name="arg0">The variables to insert into '$0' placeholder in the expression.</param>
         /// <param name="arg1">The variables to insert into '$1' placeholder in the expression.</param>
-        public static TResult Expression<TArg0, TArg1, TResult>(string javascript, TArg0 arg0, TArg1 arg1)
+        public static JsObject Expression<TArg0, TArg1>(string javascript, TArg0 arg0, TArg1 arg1)
         {
-            return default(TResult);
+            throw new NotSupportedException("Not available outside JS");
         }
 
         /// <summary>
-        /// When running as C#, this method does nothing and returns null.
+        /// When running as C#, this method throws NotSupportedException.
         /// When running as JavaScript, the passed-in script code replaces this method call.
         /// Variables can be referenced by index. '$0' is the first variable.
         /// </summary>
@@ -207,13 +52,13 @@ public static TResult Expression<TArg0, TArg1, TResult>(string javascript, TArg0
         /// <param name="arg0">The variables to insert into '$0' placeholder in the expression.</param>
         /// <param name="arg1">The variables to insert into '$1' placeholder in the expression.</param>
         /// <param name="arg2">The variables to insert into '$2' placeholder in the expression.</param>
-        public static TResult Expression<TArg0, TArg1, TArg2, TResult>(string javascript, TArg0 arg0, TArg1 arg1, TArg2 arg2)
+        public static JsObject Expression<TArg0, TArg1, TArg2>(string javascript, TArg0 arg0, TArg1 arg1, TArg2 arg2)
         {
-            return default(TResult);
+            throw new NotSupportedException("Not available outside JS");
         }
 
         /// <summary>
-        /// When running as C#, this method does nothing and returns null.
+        /// When running as C#, this method throws NotSupportedException.
         /// When running as JavaScript, the passed-in script code replaces this method call.
         /// Variables can be referenced by index. '$0' is the first variable.
         /// </summary>
@@ -222,13 +67,13 @@ public static TResult Expression<TArg0, TArg1, TArg2, TResult>(string javascript
         /// <param name="arg1">The variables to insert into '$1' placeholder in the expression.</param>
         /// <param name="arg2">The variables to insert into '$2' placeholder in the expression.</param>
         /// <param name="arg3">The variables to insert into '$3' placeholder in the expression.</param>
-        public static TResult Expression<TArg0, TArg1, TArg2, TArg3, TResult>(string javascript, TArg0 arg0, TArg1 arg1, TArg2 arg2, TArg3 arg3)
+        public static JsObject Expression<TArg0, TArg1, TArg2, TArg3>(string javascript, TArg0 arg0, TArg1 arg1, TArg2 arg2, TArg3 arg3)
         {
-            return default(TResult);
+            throw new NotSupportedException("Not available outside JS");
         }
 
         /// <summary>
-        /// When running as C#, this method does nothing and returns null.
+        /// When running as C#, this method does throws NotSupportedException.
         /// When running as JavaScript, the passed-in script code replaces this method call.
         /// Variables can be referenced by index. '$0' is the first variable.
         /// </summary>
@@ -238,13 +83,13 @@ public static TResult Expression<TArg0, TArg1, TArg2, TArg3, TResult>(string jav
         /// <param name="arg2">The variables to insert into '$2' placeholder in the expression.</param>
         /// <param name="arg3">The variables to insert into '$3' placeholder in the expression.</param>
         /// <param name="arg4">The variables to insert into '$4' placeholder in the expression.</param>
-        public static TResult Expression<TArg0, TArg1, TArg2, TArg3, TArg4, TResult>(string javascript, TArg0 arg0, TArg1 arg1, TArg2 arg2, TArg3 arg3, TArg4 arg4)
+        public static JsObject Expression<TArg0, TArg1, TArg2, TArg3, TArg4>(string javascript, TArg0 arg0, TArg1 arg1, TArg2 arg2, TArg3 arg3, TArg4 arg4)
         {
-            return default(TResult);
+            throw new NotSupportedException("Not available outside JS");
         }
 
         /// <summary>
-        /// When running as C#, this method does nothing and returns null.
+        /// When running as C#, this method does throws NotSupportedException.
         /// When running as JavaScript, the passed-in script code replaces this method call.
         /// Variables can be referenced by index. '$0' is the first variable.
         /// </summary>
@@ -255,13 +100,13 @@ public static TResult Expression<TArg0, TArg1, TArg2, TArg3, TArg4, TResult>(str
         /// <param name="arg3">The variables to insert into '$3' placeholder in the expression.</param>
         /// <param name="arg4">The variables to insert into '$4' placeholder in the expression.</param>
         /// <param name="arg5">The variables to insert into '$5' placeholder in the expression.</param>
-        public static TResult Expression<TArg0, TArg1, TArg2, TArg3, TArg4, TArg5, TResult>(string javascript, TArg0 arg0, TArg1 arg1, TArg2 arg2, TArg3 arg3, TArg4 arg4, TArg5 arg5)
+        public static JsObject Expression<TArg0, TArg1, TArg2, TArg3, TArg4, TArg5>(string javascript, TArg0 arg0, TArg1 arg1, TArg2 arg2, TArg3 arg3, TArg4 arg4, TArg5 arg5)
         {
-            return default(TResult);
+            throw new NotSupportedException("Not available outside JS");
         }
 
         /// <summary>
-        /// When running as C#, this method does nothing and returns null.
+        /// When running as C#, this method throws NotSupportedException.
         /// When running as JavaScript, the passed-in script code replaces this method call.
         /// Variables can be referenced by index. '$0' is the first variable.
         /// </summary>
@@ -273,13 +118,13 @@ public static TResult Expression<TArg0, TArg1, TArg2, TArg3, TArg4, TArg5, TResu
         /// <param name="arg4">The variables to insert into '$4' placeholder in the expression.</param>
         /// <param name="arg5">The variables to insert into '$5' placeholder in the expression.</param>
         /// <param name="arg6">The variables to insert into '$6' placeholder in the expression.</param>
-        public static TResult Expression<TArg0, TArg1, TArg2, TArg3, TArg4, TArg5, TArg6, TResult>(string javascript, TArg0 arg0, TArg1 arg1, TArg2 arg2, TArg3 arg3, TArg4 arg4, TArg5 arg5, TArg6 arg6)
+        public static JsObject Expression<TArg0, TArg1, TArg2, TArg3, TArg4, TArg5, TArg6>(string javascript, TArg0 arg0, TArg1 arg1, TArg2 arg2, TArg3 arg3, TArg4 arg4, TArg5 arg5, TArg6 arg6)
         {
-            return default(TResult);
+            throw new NotSupportedException("Not available outside JS");
         }
 
         /// <summary>
-        /// When running as C#, this method does nothing and returns null.
+        /// When running as C#, this method throws NotSupportedException.
         /// When running as JavaScript, the passed-in script code replaces this method call.
         /// Variables can be referenced by index. '$0' is the first variable.
         /// </summary>
@@ -292,9 +137,9 @@ public static TResult Expression<TArg0, TArg1, TArg2, TArg3, TArg4, TArg5, TArg6
         /// <param name="arg5">The variables to insert into '$5' placeholder in the expression.</param>
         /// <param name="arg6">The variables to insert into '$6' placeholder in the expression.</param>
         /// <param name="arg7">The variables to insert into '$7' placeholder in the expression.</param>
-        public static TResult Expression<TArg0, TArg1, TArg2, TArg3, TArg4, TArg5, TArg6, TArg7, TResult>(string javascript, TArg0 arg0, TArg1 arg1, TArg2 arg2, TArg3 arg3, TArg4 arg4, TArg5 arg5, TArg6 arg6, TArg7 arg7)
+        public static JsObject Expression<TArg0, TArg1, TArg2, TArg3, TArg4, TArg5, TArg6, TArg7>(string javascript, TArg0 arg0, TArg1 arg1, TArg2 arg2, TArg3 arg3, TArg4 arg4, TArg5 arg5, TArg6 arg6, TArg7 arg7)
         {
-            return default(TResult);
+            throw new NotSupportedException("Not available outside JS");
         }
     }
 }