Rocket.Chat/app/ui/client/components/contextualBar.js

import { Template } from 'meteor/templating';

Template.contextualBar.events({
	'click .js-close'(e, t) {
		t.tabBar.close();
	},
});

Template.contextualBar.onCreated(function() {
	this.tabBar = Template.currentData().tabBar;
});

Template.contextualBar.helpers({
	id() {
		return Template.instance().tabBar.getId();
	},
	template() {
		return Template.instance().tabBar.getTemplate();
	},
	headerData() {
		return Template.instance().tabBar.getData();
	},
	flexData() {
		const { tabBar } = Template.instance();
		return {
			tabBar,
			...tabBar.getData(),
			...Template.currentData().data,
		};
	},
});