message: Make default actual function
diff: Promise = require 'bluebird-q'
  Serializer = require '../../../../components/form/serializer.coffee'
  -module.exports = ($el, onSubmit = Promise.resolve()) ->
  +module.exports = ($el, onSubmit = -> Promise.resolve()) ->
  $submit = $el.find('button')
  $errors = $el.find('.js-form-errors')
  