Typescript

Project structure with tsconfig.json

The rootDir config defines the root of all source files. By default this is the longest common path of all non-declaration input files.

The structure under rootDir will be preserved in the output directory. Relative imports are relative to this directory.

The include config will define more specifically which files should be included. You could include all *.ts files here for example.

If include pulls in files that are not in rootDir, you will get an error. But presumably you could stash files under rootDir that the include parameters does not pull in, and that would not be an error.