Dale,
We have such a support, but unfortunately we don’t support multiple tsconfig files yet and I think you might be using project where you have at least two. You can change tsconfig used by our services in project properties: right click on the project > TypeScript and browse for different tsconfig.json. We will improve support for files outside of current tsconfig.json in the upcoming release, so that at least you get content assist and we are working on support for multiple tsconfig files.
Best regards,
Piotr Tomiak