[SOLVED] How will the Chakra Jscript engine be exposed to Scripting Hosts?

How will the Chakra Jscript engine be exposed to Scripting Hosts?

Anybody has experience with the upcoming IE9 Chakra engine? I am currently considering whether to incorporate the Microsoft's JScript engine through the Window Script Interface or using one of those open source javascript engines (tracemonkey/v8 etc).

The JScript engine is a bit too slow and Chakra looks promising. But I am not sure if it will be accessible the same way as before since Active Scripting should be deprecated.

Anybody get some idea?

Solution

I'm not aware that ActiveScripting is deprecated - I've seen no statement from Microsoft along those lines.

Microsoft's documentation suggests that IE9's Javascript engine (code-named "chakra") still gets loaded by IActiveScript. Though MS does not document a ProgId or CLSID, there is a CLSID you can use:

{16d51579-a30b-4c8b-a276-0ff4dc41e755}

The C# code to load the Chakra scripting engine looks like this:

    var guid = new System.Guid("{16d51579-a30b-4c8b-a276-0ff4dc41e755}");
    Type engineType = Type.GetTypeFromCLSID(guid, true);
    var engine = Activator.CreateInstance(engineType) as IActiveScript;

In my limited tests in various micro-benchmarks, Chakra is about 2x the speed of JScript v5.8.