Convert rocketchat-gitlab to main module structure (#12646)

packages/rocketchat-gitlab/client/index.js

@@ -0,0 +1,2 @@
+import './gitlab-login-button.css';
+import '../lib/common';

packages/rocketchat-gitlab/lib/common.js

@@ -1,6 +1,7 @@
-/* global CustomOAuth */
 import { Meteor } from 'meteor/meteor';
 import { Tracker } from 'meteor/tracker';
+import { RocketChat } from 'meteor/rocketchat:lib';
+import { CustomOAuth } from 'meteor/rocketchat:custom-oauth';
 
 const config = {
 	serverURL: 'https://gitlab.com',

packages/rocketchat-gitlab/package.js

@@ -5,13 +5,12 @@ Package.describe({
 });
 
 Package.onUse(function(api) {
-	api.use('ecmascript');
-	api.use('rocketchat:lib');
-	api.use('rocketchat:custom-oauth');
-
-	api.use('templating', 'client');
-
-	api.addFiles('common.js');
-	api.addFiles('gitlab-login-button.css', 'client');
-	api.addFiles('startup.js', 'server');
+	api.use([
+		'ecmascript',
+		'rocketchat:lib',
+		'rocketchat:custom-oauth',
+		'templating',
+	]);
+	api.mainModule('client/index.js', 'client');
+	api.mainModule('server/index.js', 'server');
 });

packages/rocketchat-gitlab/server/index.js

@@ -0,0 +1,2 @@
+import './startup';
+import '../lib/common';

packages/rocketchat-gitlab/server/startup.js

@@ -1,3 +1,5 @@
+import { RocketChat } from 'meteor/rocketchat:lib';
+
 RocketChat.settings.addGroup('OAuth', function() {
 	this.section('GitLab', function() {
 		const enableQuery = {