Convert rocketchat-assets to main module structure (#12521)

packages/rocketchat-assets/package.js

@@ -14,5 +14,5 @@ Package.onUse(function(api) {
 		'webapp-hashing',
 	]);
 
-	api.addFiles('server/assets.js', 'server');
+	api.mainModule('server/index.js', 'server');
 });

packages/rocketchat-assets/server/assets.js

@@ -1,8 +1,10 @@
-/* global WebAppHashing, WebAppInternals */
 import { Meteor } from 'meteor/meteor';
 import { WebApp } from 'meteor/webapp';
+import { RocketChat } from 'meteor/rocketchat:lib';
+import { RocketChatFile } from 'meteor/rocketchat:file';
+import { WebAppHashing } from 'meteor/webapp-hashing';
+import { WebAppInternals } from 'meteor/webapp';
 import _ from 'underscore';
-
 import sizeOf from 'image-size';
 import mime from 'mime-type/with-db';
 import crypto from 'crypto';

packages/rocketchat-assets/server/index.js

@@ -0,0 +1 @@
+import './assets';