Compile / edit time pluggable analyzers like C#

Nadie ha tomado este issue todavía.

It would be nice to have similar plugabble compile time / editing time analyzer plugins as [introduced in C# in Build 2015, see the video](http://channel9.msdn.com/Events/Build/2015/3-725).

Analyzer is a library that can do additional syntax checks, tag lines as errors / warnings, and are interpreted by language service.

I can imagine one could do similar things with it as Facebook's flow does e.g. own nullable checking just by writing own analyzer. This would be configurable from tsconfig, maybe one could whitelist the files each analyzer works on. This way the nullability check analyzer would only complain about the code I want.

El issue no menciona inicialmente archivos, pruebas ni puntos de entrada. Empieza localizando los puntos de extensión del compilador y del servicio de lenguaje, y luego define la API del analizador, el comportamiento de la configuración y la integración de los diagnósticos antes de implementar.

Escrito por el modelo de indexación a partir del texto del issue.