code: function List(question, answers, ui) {
    Radio.apply(this, arguments);
    this.listInitialized = false;
    this.question.type = 'list';
    this.on('ask', this.onAsk.bind(this));
    this.on('render', () => {
      if (this.contextHistory.length > 0) this.helpMessage = '';
    });
  }
docs: List prompt