text: import { computed } from '@ember/object';
  import Mixin from '@ember/object/mixin';
  
  export default Mixin.create({
    displayName: computed('firstName', 'lastName', function() {
      const firstName = this.get('firstName');
      const lastName = this.get('lastName');
  
      if (!firstName && !lastName) {
        return this.get('email');
      }
  
      return `${firstName} ${lastName}`.trim();
    })
  });
  