Modify emitter behaviour

[tomitrescak]

Is it possible somehow to modify emitter behaviour, without recompiling the whole typescript lib?
I really like to use https://www.npmjs.com/package/jsx-control-statements but because of the I always have to use babel during my compilations and I'd like to skip that.

What I would modify is emitJSXOpening element and emitJSXClosing element.

[mhegazy]

We now have public emitter transformation API: #13940.