typescript-all-in /path/to/project in a project where a typescript converter is setup and typescript is installd. The effect will be:
jsfile will be changed to a
// @ts-ignore typescript-all-inerror, so the project will still compile
// @ts-ignore typescript-all-incomment will be removed and it will be checked if they are still needed
This means if you ran this command already, you can safely run it again. Plus, you can also run it after you fixed a type error to check which other ones might also be fixed by that.