Created by: ryota-murakami
By default, CRA doesn't allow import file outside the /src showing bellow error overlay if you do it.
It mainly gives TypeScript users an inconvenient experience as far as I can see this issue https://github.com/facebook/create-react-app/issues/8785 and including me.
So I implemented simple way that following other dynamic webpack config creatation.
If I missing something or need extra modify please feedback freely, I'll appreciate it.