Created by: cdtkrk
Related Issue: https://github.com/facebook/create-react-app/issues/9984#
EDITED: See https://github.com/facebook/create-react-app/pull/10784#issuecomment-813851878
Without FAST_REFRESH=false, auto reload on src/index.js does not work.
According to comment, react-refresh should be disabled by default.
This commit changes default value of process.env.FAST_REFRESH.
For testing
$ yarn create-react-app path/to/app.
Edit path/to/app/src/index.js.