Initial scaffold from yo joplin

api/JoplinFilters.d.ts

@@ -0,0 +1,11 @@
+import { FilterHandler } from '../../../eventManager';
+/**
+ * @ignore
+ *
+ * Not sure if it's the best way to hook into the app
+ * so for now disable filters.
+ */
+export default class JoplinFilters {
+    on(name: string, callback: FilterHandler): Promise<void>;
+    off(name: string, callback: FilterHandler): Promise<void>;
+}