discourse/app/assets/javascripts/wizard/controllers/step.js.es6

import getUrl from 'discourse-common/lib/get-url';

export default Ember.Controller.extend({
  wizard: null,
  step: null,

  actions: {
    goNext(response) {
      const next = this.get('step.next');
      if (response.refresh_required) {
        document.location = getUrl(`/wizard/steps/${next}`);
      } else {
        this.transitionToRoute('step', next);
      }
    },
    goBack() {
      this.transitionToRoute('step', this.get('step.previous'));
    },
  }
});