Summary
I have a project that makes use of tsc --build to build multiple projects using project references. Some of those referenced projects use the --incremental flag.
ncdc doesn't seem to benefit from the performance gains those tools give. e.g generating types can take 17 seconds to build even if there is a tsconfig.tsbuildinfo file.
Here's the API that should be able to help: microsoft/TypeScript#31432
Any changes need to keep backwards compatibility with non build/incremental typescript projects.