Actually I'm not resistant to TypeScript. I just don't want it. Reasons are: - Google changes their mind so freaking often that it's simple not a good idea to follow them there. (Just look at GWT, good project however the direction is more and more confusing especially the communication is really really akward. - Why changing to Angular 2 and TypeScript when there are way many other frameworks that are either in JavaScript or just a little bit better suited for some things? - Why can't I upgrade in a slow path with small deprecations? (i.e. emberjs, react)

That are the most reasonable. Actually there are some others which has more something todo with our internal things and that ScalaJS < = > Scala is so good at the current stage.