The file will have its original line endings in your working directory

LF will be replaced by CRLF in src/App.js. The file will have its original line endings in your working directory

터미널에 아래 명령어를 쳐준다.
git config --global core.autocrlf true

참고
https://blog.jaeyoon.io/2018/01/git-crlf.html
https://dabo-dev.tistory.com/13