with-typescript-eslint-jest creates pages/api/hello.tsx

Bug report

with-typescript-eslint-jest creates pages/api/hello.tsx instead of pages/api/hello.ts

To Reproduce

1. npx create-next-app --example with-typescript-eslint-jest with-typescript-eslint-jest-app
2. page/api/ has hello.tsx instead of hello.ts

Expected behavior

Expected a .ts file and not a .tsx file for API.

Screenshots

N/A

System information

• OS: Ubuntu 20.04
• Browser: N/A
• Version of Next.js: 9.5.3
• Version of Node.js: 14.9.0

Additional context

This is easy for me to fix. For new or less experienced users this might be confusing and misleading.

[piotrzarycki]

Hi, can i take this one? 😃

[timneutkens]

Both are fine really, but feel free to send a PR.