Eventually I wonder if the TypeScript team will revert their stance on not allowing compiler plugins. It seems like such a waste not to have a standard package interface. All this is doing is exposing the already provided compiler tools, its not using Babel or anything, its just a nicer API over the raw TS compiler API.
Arguably, the TypeScript team should be supplying that nicer API. Its the only thing missing to me from TypeScript that it really needs.
This can be easily solved by using https://github.com/cevek/ttypescript, which enables the use of transformers in tsc and allows them to be defined in the tsconfig.json file.