ensure dispatcher is run before other DOMContentLoaded handlers

app/assets/javascripts/dispatcher.js

@@ -12,9 +12,9 @@ import ShortcutsIssuable from './shortcuts_issuable';
 import Diff from './diff';
 import SearchAutocomplete from './search_autocomplete';
 
-(function() {
-  var Dispatcher;
+var Dispatcher;
 
+(function() {
   Dispatcher = (function() {
     function Dispatcher() {
       this.initSearch();
@@ -629,8 +629,8 @@ import SearchAutocomplete from './search_autocomplete';
 
     return Dispatcher;
   })();
+})();
 
-  $(window).on('load', function() {
-    new Dispatcher();
-  });
-}).call(window);
+export default function initDispatcher() {
+  return new Dispatcher();
+}

app/assets/javascripts/main.js

@@ -33,7 +33,7 @@ import './projects_dropdown';
 import './render_gfm';
 import initBreadcrumbs from './breadcrumb';
 
-import './dispatcher';
+import initDispatcher from './dispatcher';
 
 // eslint-disable-next-line global-require, import/no-commonjs
 if (process.env.NODE_ENV !== 'production') require('./test_utils/');
@@ -265,4 +265,6 @@ $(() => {
       removeFlashClickListener(flashEl);
     });
   }
+
+  initDispatcher();
 });