try and error - JS imports for Discoure

import { registerOption } from 'pretty-text/pretty-text';
import {whiteListIframe} from 'pretty-text/sanitizer';

assets/javascripts/image-tag-whitelist.js

@@ -1,9 +1,8 @@
-import { registerOption } from 'pretty-text/pretty-text';
+import {whiteListTag} from 'pretty-text/sanitizer';
 
 (function() {
 
   Discourse.Markdown.whiteListTag('span', 'class', 'dropcap'); 
   Discourse.Markdown.whiteListTag('span', 'class', 'sclass');
-  
 
 })();