Want to use TypeScript for your Dynamics CRM 2011 JavaScript web resources check this module http://crm2011typescript.codeplex.com/

To learn more about Type Script click http://www.typescriptlang.org/

To read more about how to work with TypeScript and Dynamics CRM I recommend reading this article

http://crmconsultancy.wordpress.com/2012/10/02/microsoft-typescript/