It deleted 100s of files, most of which were Jest test files, and potentially all of which were a mistake. I restored them all with `git restore $(git ls-files -d)`.
I then ran `tsc` on the remaining _modified_ files and `Found 3920 errors in 511 files.`
Obviously at that point I had no choice but to discard all changes and unfortunately I would not recommend this for others to even try.
BTW the VSCode extension which someone else linked to discovered everything perfectly, which is another hint that your tool needs to improve, not your users.
Even if tsconfig.json was very important, and the users are all wrong and you're right, the only thing your readme says is: "The CLI will respect the tsconfig.json for loading source files." which is insufficient.
Most transformations like this are not possible with pure static analysis and require some domain knowledge (or repo-specific knowledge) in order to pull off correctly. This is because some code gets "used" in ways that are not apparent i the code.
Enjoy!