The website itself has a lot more information: http://www.typescriptlang.org/ http://www.typescriptlang.org/ At a glance, this looks like a rather elegant sol

The website itself has a lot more information: http://www.typescriptlang.org/ http://www.typescriptlang.org/ At a glance, this looks like a rather elegant solution to the problem of adding optional type-markers to JS without completely destroying the nature of the language (as AS3 did, IMO).