Rocket.Chat/app/lib/client/defaultTabBars.js

import { Session } from 'meteor/session';

import { TabBar } from '../../ui-utils';
import { Rooms } from '../../models';
import { hasAllPermission } from '../../authorization';
import { roomTypes } from '../../utils/client';

TabBar.addButton({
	groups: ['channel', 'group', 'direct'],
	id: 'rocket-search',
	i18nTitle: 'Search_Messages',
	icon: 'magnifier',
	template: 'RocketSearch',
	order: 4,
});

TabBar.addButton({
	groups: ['direct'],
	id: 'user-info',
	i18nTitle: 'User_Info',
	icon: 'user',
	template: 'membersList',
	order: 5,
	condition() {
		const rid = Session.get('openedRoom');
		const room = Rooms.findOne({
			_id: rid,
		});

		return room && !roomTypes.getConfig(room.t).isGroupChat(room);
	},
});

TabBar.addButton({
	groups: ['direct'],
	id: 'user-info-group',
	i18nTitle: 'Members',
	icon: 'team',
	template: 'membersList',
	order: 5,
	condition() {
		const rid = Session.get('openedRoom');
		const room = Rooms.findOne({
			_id: rid,
		});

		return room && roomTypes.getConfig(room.t).isGroupChat(room);
	},
});

TabBar.addButton({
	groups: ['channel', 'group'],
	id: 'members-list',
	i18nTitle: 'Members',
	icon: 'team',
	template: 'membersList',
	order: 5,
	condition() {
		const rid = Session.get('openedRoom');
		const room = Rooms.findOne({
			_id: rid,
		});

		if (!room || !room.broadcast) {
			return true;
		}

		return hasAllPermission('view-broadcast-member-list', rid);
	},
});

TabBar.addButton({
	groups: ['channel', 'group', 'direct'],
	id: 'uploaded-files-list',
	i18nTitle: 'Files',
	icon: 'clip',
	template: 'uploadedFilesList',
	order: 6,
});

TabBar.addButton({
	groups: ['channel', 'group', 'direct'],
	id: 'keyboard-shortcut-list',
	i18nTitle: 'Keyboard_Shortcuts_Title',
	icon: 'keyboard',
	template: 'KeyboardShortcuts',
	full: true,
	order: 99,
});