no-restricted-syntaxbe helpful somehow? I've been already quite surprised by its power (eslint/eslint#8677) ;)
--print-configoption on your machine and that of your coworker; you might see a difference in eslint-plugin-react rules being applied. You could then run ESLint with the
--debugoption to see what config files are being loaded and used in the configuration resolution steps. Maybe you or your coworker has an extra config file in the mix.