Convert rocketchat-message-attachments to main module structure (#12760)

packages/rocketchat-message-attachments/client/index.js

+import './stylesheets/messageAttachments.css';
+import './messageAttachment.html';
+import './messageAttachment';

packages/rocketchat-message-attachments/client/messageAttachment.js

@@ -2,13 +2,15 @@ import { Meteor } from 'meteor/meteor';
 import { DateFormat } from 'meteor/rocketchat:lib';
 import { fixCordova } from 'meteor/rocketchat:lazy-load';
 import { Template } from 'meteor/templating';
+import { RocketChat } from 'meteor/rocketchat:lib';
+import { renderMessageBody } from 'meteor/rocketchat:ui-message';
+
 const colors = {
 	good: '#35AC19',
 	warning: '#FCB316',
 	danger: '#D30230',
 };
 
-/* globals renderMessageBody*/
 Template.messageAttachment.helpers({
 	fixCordova,
 	parsedText() {

packages/rocketchat-message-attachments/package.js

@@ -12,11 +12,7 @@ Package.onUse(function(api) {
 		'rocketchat:lib',
 		'rocketchat:lazy-load',
 		'rocketchat:e2e',
+		'rocketchat:ui-message',
 	]);
-
-	api.addFiles('client/messageAttachment.html', 'client');
-	api.addFiles('client/messageAttachment.js', 'client');
-
-	// stylesheets
-	api.addFiles('client/stylesheets/messageAttachments.css', 'client');
+	api.mainModule('client/index.js', 'client');
 });