In both 9.1.1 and 9.1.2 there issues with TS at least in VS 2015 _only_.
This issue is only observed when R# is enabled. After I suspend it, the issue disappers. After enabling R#, the issue appears again. There is no issue observed on the same machine when running VS 2013.
The problem is that R# constantly reports that TypeScript class does not implement specified interface when it actually does. It does not happen with any interface but at least in some of those with generics. Here is the example: