Fix possible memory leak in inner and worker

www/admin/inner.js

@@ -972,6 +972,19 @@ define([
             require(['/api/broadcast?'+ (+new Date())], function (Broadcast) {
                 // XXX require.s.contexts._ can be used to erase old loaded objects
                 cb(Broadcast);
+                setTimeout(function () {
+                    try {
+                        var ctx = require.s.contexts._;
+                        var defined = ctx.defined;
+                        Object.keys(defined).forEach(function (href) {
+                            if (/^\/api\/broadcast\?[0-9]{13}/.test(href)) {
+                                console.error(href);
+                                delete defined[href];
+                                return;
+                            }
+                        });
+                    } catch (e) {}
+                });
             });
         };
     };
@@ -1061,7 +1074,7 @@ define([
         var form = h('div.cp-admin-broadcast-form');
         var $form = $(form).appendTo($div);
 
-        var refresh = getApi(function (/* Broadcast */) { // XXX unused argument
+        var refresh = getApi(function (Broadcast) {
             var button = h('button.btn.btn-primary', Messages.admin_broadcastButton);
             var $button = $(button);
             var removeButton = h('button.btn.btn-danger', Messages.admin_broadcastCancel);
@@ -1071,8 +1084,7 @@ define([
             var deleted = [];
 
             // Render active message (if there is one)
-            require(['/api/broadcast?'+ (+new Date())], function (BCast) {
+            var hash = Broadcast.lastBroadcastHash || '1'; // Truthy value if no lastKnownHash
-                var hash = BCast.lastBroadcastHash || '1'; // Truthy value if no lastKnownHash
             common.mailbox.getNotificationsHistory('broadcast', null, hash, function (e, msgs) {
                 if (e) { return void console.error(e); }
                 if (!Array.isArray(msgs)) { return; }
@@ -1109,7 +1121,6 @@ define([
                 });
                 if (!activeUid) { $active.hide(); }
             });
-            });
 
             // Custom message
             var container = h('div.cp-broadcast-container');

www/common/outer/async-store.js

@@ -630,6 +630,7 @@ define([
             // use uid in /api/broadcast so that all connected users will use the same cached
             // version on the server
             require(['/api/broadcast?'+uid], function (Broadcast) {
+                if (!Broadcast) { return; }
                 broadcast([], 'UNIVERSAL_EVENT', {
                     type: 'broadcast',
                     data: {
@@ -637,6 +638,18 @@ define([
                         data: Broadcast.maintenance
                     }
                 });
+                setTimeout(function () {
+                    try {
+                        var ctx = require.s.contexts._;
+                        var defined = ctx.defined;
+                        Object.keys(defined).forEach(function (href) {
+                            if (/^\/api\/broadcast\?[a-z0-9]+/.test(href)) {
+                                delete defined[href];
+                                return;
+                            }
+                        });
+                    } catch (e) {}
+                });
             });
         };
         Store.onSurveyUpdate = function (uid) {