diff --git a/src/lib/components/events/booru-events.ts b/src/lib/components/events/booru-events.ts
new file mode 100644
index 0000000..a726d9b
--- /dev/null
+++ b/src/lib/components/events/booru-events.ts
@@ -0,0 +1,5 @@
+export const eventFetchComplete = 'fetchcomplete';
+
+export interface BooruEventsMap {
+  [eventFetchComplete]: null; // Site sends the response, but extension will not get it due to isolation.
+}
diff --git a/src/lib/components/events/comms.ts b/src/lib/components/events/comms.ts
index 30f4961..359e78d 100644
--- a/src/lib/components/events/comms.ts
+++ b/src/lib/components/events/comms.ts
@@ -1,12 +1,15 @@
 import type { MaintenancePopupEventsMap } from "$lib/components/events/maintenance-popup-events";
 import { BaseComponent } from "$lib/components/base/BaseComponent";
 import type { FullscreenViewerEventsMap } from "$lib/components/events/fullscreen-viewer-events";
+import type { BooruEventsMap } from "$lib/components/events/booru-events";
 
-interface EventsMapping extends MaintenancePopupEventsMap, FullscreenViewerEventsMap {
-}
+type EventsMapping =
+  MaintenancePopupEventsMap
+  & FullscreenViewerEventsMap
+  & BooruEventsMap;
 
 type EventCallback<EventDetails> = (event: CustomEvent<EventDetails>) => void;
-type UnsubscribeFunction = () => void;
+export type UnsubscribeFunction = () => void;
 type ResolvableTarget = EventTarget | BaseComponent;
 
 function resolveTarget(componentOrElement: ResolvableTarget): EventTarget {