I would check if this is an issue with create-react-app, or any other NPM package. Try installing gulp and calling it as suggested here: https://github.com/facebookincubator/create-react-app/issues/138#issuecomment-234998109
If calling gulp doesn’t work, then the following suggestion should work: https://github.com/facebookincubator/create-react-app/issues/138#issuecomment-325508468
