Rocket.Chat/app/push-notifications/client/tabBar.js

import { Meteor } from 'meteor/meteor';

import { TabBar } from '../../ui-utils';

Meteor.startup(function() {
	TabBar.addButton({
		groups: ['channel', 'group', 'direct'],
		id: 'push-notifications',
		i18nTitle: 'Notifications_Preferences',
		icon: 'bell',
		template: 'NotificationsPreferences',
		full: true,
		order: 8,
	});
});