diff --git a/js/src/common/Application.ts b/js/src/common/Application.ts
index abd753799..db3abd24a 100644
--- a/js/src/common/Application.ts
+++ b/js/src/common/Application.ts
@@ -95,7 +95,7 @@ export default abstract class Application {
      * An Alert that was shown as a result of an AJAX request error. If present,
      * it will be dismissed on the next successful request.
      */
-    private requestError: Alert | null = null;
+    private requestError: RequestError | null = null;
 
     data!: ApplicationData;
 
diff --git a/js/src/common/Bus.ts b/js/src/common/Bus.ts
deleted file mode 100644
index c2de342a9..000000000
--- a/js/src/common/Bus.ts
+++ /dev/null
@@ -1,17 +0,0 @@
-import forEach from 'lodash/forEach';
-import get from 'lodash/get';
-import set from 'lodash/set';
-
-export default class Bus {
-    subscribers = {};
-
-    subscribe(event, callable) {
-        set(this.subscribers, event + '[]', callable);
-    }
-
-    dispatch(event, args: any = null) {
-        forEach(get(this.subscribers, event), function(listener) {
-            listener(event, args);
-        });
-    }
-}