Convert all CoffeeScript to Javascript. See:

http://meta.discourse.org/t/is-it-better-for-discourse-to-use-javascript-or-coffeescript/3153

app/assets/javascripts/preload_store.js

@@ -0,0 +1,56 @@
+
+/* We can insert data into the PreloadStore when the document is loaded.
+   The data can be accessed once by a key, after which it is removed */
+(function() {
+
+  window.PreloadStore = {
+    data: {},
+    store: function(key, value) {
+      this.data[key] = value;
+    },
+    /* To retrieve a key, you provide the key you want, plus a finder to
+       load it if the key cannot be found. Once the key is used once, it is
+       removed from the store. So, for example, you can't load a preloaded topic
+       more than once. */
+    get: function(key, finder) {
+      var promise, result;
+      promise = new RSVP.Promise();
+      if (this.data[key]) {
+        promise.resolve(this.data[key]);
+        delete this.data[key];
+      } else {
+        if (finder) {
+          result = finder();
+
+          // If the finder returns a promise, we support that too
+          if (result.then) {
+            result.then(function(result) {
+              return promise.resolve(result);
+            }, function(result) {
+              return promise.reject(result);
+            });
+          } else {
+            promise.resolve(result);
+          }
+        } else {
+          promise.resolve(void 0);
+        }
+      }
+      return promise;
+    },
+    /* Does the store contain a particular key? Does not delete, just returns
+       true or false. */
+    contains: function(key) {
+      return this.data[key] !== void 0;
+    },
+    /* If we are sure it's preloaded, we don't have to supply a finder. Just
+       returns undefined if it's not in the store. */
+    getStatic: function(key) {
+      var result;
+      result = this.data[key];
+      delete this.data[key];
+      return result;
+    }
+  };
+
+}).call(this);