I don't do anything with generated code. But is it necessary to generate that code every time TSC does a build? Could it be independent? I usually use two different ts export indexes, and create two dist JS files for each app. Most of the boilerplate that rarely gets touched (user management, login and signup screens, common UI elements, utility code) is essentially in an outer JS file that loads the inner JS with the business logic and meat of the app, but has no imports from the inner JS whatsoever. They're basically two separate projects. Not that I've noticed much difference with tsc, but it makes webpack or r.js faster if you can create separate webs of dependencies and only need to repack one of them without touching the other...
