Include a --style=sass or --style=css while initialising an app. #6328

While doing create-react-app <app-name> to initialise an app, I want to include a flag:

create-react-app <app-name> --style=sass : It will pre-include sass preprocessors and make scss files in the directory out of the box.

@ianschmitz @iansu I feel this is an important feature which is present in angular-cli but not in create-react-app.