We've included a slightly refactored version of the textfieldStepper in the gpii/prefsEditors repo.
https://github.com/GPII/prefsEditors/blob/master/src/shared/components/textfieldStepper/js/textfieldStepper.js

If the one we've included satisfies your needs, you can remove this one. If it doesn't, please look at either updating or replacing that one.