forum/plugins/chat/assets/javascripts/discourse/components/styleguide/chat-modal-new-message.js

import Component from "@glimmer/component";
import { action } from "@ember/object";
import { service } from "@ember/service";
import ChatModalNewMessage from "discourse/plugins/chat/discourse/components/chat/modal/new-message";

export default class ChatStyleguideChatModalNewMessage extends Component {
  @service modal;

  @action
  openModal() {
    return this.modal.show(ChatModalNewMessage);
  }
}