jwolthuis - 12:19 pm on Oct 3, 2012 (gmt 0)

TypeScript is a development tool to aid developers in type checking their JavaScript code, and to provide Intellisense for code completion. The idea is that more coding errors will be caught at design-time, not at run-time.

TypeScript operates along the same lines as JSLint. So I guess if you think those types of developer productivity tools are evil, you should stay away from them.

When TypeScript is compiled, it translates into plain old JavaScript. Your browser simply sees JavaScript, and cannot tell if TypeScript was used to create it at design-time. So the only security hole would be in your browser, if it has a buggy JavaScript interpreter/compiler.