Whenever I feel in the mood to troll people, I tell them that TS is just a worse AS3. AS3 has types, classes... it even had XML literals! Eat that, JSX.
To be more precise, TS is a worse ES4. AS was a partially conforming implementation of ES4 drafts that most are aware of. But Microsoft had its own thing along these lines - JScript.NET (in fact, it still ships as part of the .NET Framework, even though it's deprecated).