Not sure if this should go here or here, but the freshly scaffolded react app seems to include additional index.js and registerServiceWorker.js file in its src/ directory.

They don't cause any issue, and can be simply deleted, but I don't see any reason for them to be there either.

Is this a bug report?

Probably

Environment

1. npm ls react-scripts-ts (if you haven’t ejected): 2.13.0
2. node -v: 8.9.4
3. npm -v: 5.4.2
4. yarn --version (if you use Yarn): 1.3.2

Then, specify:

1. Operating system: macOS 10.13.2

Steps to Reproduce

1. create-react-app test-scaffold --scripts-version=react-scripts-ts

Expected Behavior

tree test-scaffold/src outputs:

test-scaffold/src
├── App.css
├── App.test.tsx
├── App.tsx
├── index.css
├── index.tsx
├── logo.svg
└── registerServiceWorker.ts

0 directories, 7 files

Actual Behavior

tree test-scaffold/src outputs:

test-scaffold/src
├── App.css
├── App.test.tsx
├── App.tsx
├── index.css
├── index.js
├── index.tsx
├── logo.svg
├── registerServiceWorker.js
└── registerServiceWorker.ts

0 directories, 9 files