Replace `Discourse.script` global with a module

app/assets/javascripts/discourse.js

@@ -5,10 +5,6 @@ window.Discourse = Ember.Application.createWithMixins(Discourse.Ajax, {
   rootElement: '#main',
   _docTitle: document.title,
 
-  script: function(url) {
-    return $LAB.script(this.getURL(url));
-  },
-
   getURL: function(url) {
     if (!url) { return url; }
 

app/assets/javascripts/discourse/initializers/live-development.js.es6

@@ -1,13 +1,13 @@
-/**
-  Use the message bus for live reloading of components for faster development.
-**/
+import loadScript from 'discourse/lib/load-script';
+
+//  Use the message bus for live reloading of components for faster development.
 export default {
   name: "live-development",
-  initialize: function() {
+  initialize() {
 
     // subscribe to any site customizations that are loaded
     $('link.custom-css').each(function() {
-      var split = this.href.split("/"),
+      const split = this.href.split("/"),
           id = split[split.length - 1].split(".css")[0],
           self = this;
 
@@ -15,7 +15,7 @@ export default {
         if (!$(self).data('orig')) {
           $(self).data('orig', self.href);
         }
-        var orig = $(self).data('orig');
+        const orig = $(self).data('orig');
 
         self.href = orig.replace(/v=.*/, "v=" + data);
       });
@@ -23,7 +23,7 @@ export default {
 
     // Custom header changes
     $('header.custom').each(function() {
-      var header = $(this);
+      const header = $(this);
       return Discourse.MessageBus.subscribe("/header-change/" + $(this).data('key'), function(data) {
         return header.html(data);
       });
@@ -40,10 +40,9 @@ export default {
         } else if (me.name.substr(-10) === "hbs") {
 
           // Reload handlebars
-          var js = me.name.replace(".hbs", "").replace("app/assets/javascripts", "/assets");
-          Discourse.script(js + "?hash=" + me.hash).wait(function() {
-            var templateName;
-            templateName = js.replace(".js", "").replace("/assets/", "");
+          const js = me.name.replace(".hbs", "").replace("app/assets/javascripts", "/assets");
+          loadScript(js + "?hash=" + me.hash).then(function() {
+            const templateName = js.replace(".js", "").replace("/assets/", "");
             return _.each(Ember.View.views, function(view) {
               if (view.get('templateName') === templateName) {
                 view.set('templateName', 'empty');
@@ -63,7 +62,7 @@ export default {
               if (!$(this).data('orig')) {
                 $(this).data('orig', this.href);
               }
-              var orig = $(this).data('orig');
+              const orig = $(this).data('orig');
               this.href = orig + (orig.indexOf('?') >= 0 ? "&hash=" : "?hash=") + me.hash;
             }
           });

app/assets/javascripts/discourse/lib/highlight-syntax.js.es6

@@ -1,10 +1,10 @@
 /*global hljs:true */
 
+import loadScript from 'discourse/lib/load-script';
+
 export default function highlightSyntax($elem) {
   const selector = Discourse.SiteSettings.autohighlight_all_code ? 'pre code' : 'pre code[class]';
   $(selector, $elem).each(function(i, e) {
-    return Discourse.script("/javascripts/highlight.pack.js").wait(function() {
-      return hljs.highlightBlock(e);
-    });
+    loadScript("/javascripts/highlight.pack.js").then(() => hljs.highlightBlock(e));
   });
 }

app/assets/javascripts/discourse/lib/lightbox.js.es6

@@ -1,6 +1,8 @@
+import loadScript from 'discourse/lib/load-script';
+
 export default function($elem) {
   $("a.lightbox", $elem).each(function(i, e) {
-    Discourse.script("/javascripts/jquery.magnific-popup-min.js").wait(function() {
+    loadScript("/javascripts/jquery.magnific-popup-min.js").then(function() {
       var $e = $(e);
       // do not lightbox spoiled images
       if ($e.parents(".spoiler").length > 0 || $e.parents(".spoiled").length > 0) { return; }

app/assets/javascripts/discourse/lib/load-script.js.es6

@@ -0,0 +1,5 @@
+export default function loadScript(url) {
+  return new Ember.RSVP.Promise(function(resolve) {
+    $LAB.script(Discourse.getURL(url)).wait(() => resolve());
+  });
+}