subs: Add `stream_ui_updates.js` module for managing ui elements.

This commit adds `stream_ui_updates.js` module. This module
will includes functions which will update different ui elements
(i.e. subscription button, subscriber count).

.eslintrc.json

@@ -169,6 +169,7 @@
         "stream_muting": false,
         "stream_popover": false,
         "stream_sort": false,
+        "stream_ui_updates": false,
         "StripeCheckout": false,
         "submessage": false,
         "subs": false,

static/js/bundles/app.js

@@ -203,6 +203,7 @@ import "js/panels.js";
 import 'js/settings_ui.js';
 import 'js/search_pill.js';
 import 'js/search_pill_widget.js';
+import 'js/stream_ui_updates.js';
 
 // Import Styles
 

static/js/js_typings/zulip/index.d.ts

@@ -137,6 +137,7 @@ declare var stream_list: any;
 declare var stream_muting: any;
 declare var stream_popover: any;
 declare var stream_sort: any;
+declare var stream_ui_updates: any;
 declare var submessage: any;
 declare var subs: any;
 declare var tab_bar: any;

static/js/stream_ui_updates.js

@@ -0,0 +1,11 @@
+var stream_ui_updates = (function () {
+
+var exports = {};
+
+return exports;
+}());
+
+if (typeof module !== 'undefined') {
+    module.exports = stream_ui_updates;
+}
+window.stream_ui_updates = stream_ui_updates;

tools/test-js-with-node

@@ -72,6 +72,7 @@ enforce_fully_covered = {
     'static/js/stream_data.js',
     'static/js/stream_events.js',
     'static/js/stream_sort.js',
+    'static/js/stream_ui_updates.js',
     'static/js/top_left_corner.js',
     'static/js/topic_data.js',
     'static/js/topic_generator.js',