diff --git a/src/Umbraco.Web.UI.Client/src/core/extension/extension.registry.ts b/src/Umbraco.Web.UI.Client/src/core/extension/extension.registry.ts
index 1c67ca1af7..a8fa7c2779 100644
--- a/src/Umbraco.Web.UI.Client/src/core/extension/extension.registry.ts
+++ b/src/Umbraco.Web.UI.Client/src/core/extension/extension.registry.ts
@@ -1,7 +1,7 @@
-import { map } from 'rxjs/operators';
 import { BehaviorSubject, Observable } from 'rxjs';
 
-export type UmbExtensionType = 'startUp' | 'section' | 'tree' | 'propertyEditor';
+// TODO: how do we want to type extensions?
+export type UmbExtensionType = 'startUp' | 'section' | 'propertyEditor';
 
 export interface UmbExtensionManifest<Meta> {
   type: UmbExtensionType;
@@ -16,11 +16,6 @@ export interface UmbManifestSectionMeta {
   weight: number;
 }
 
-export interface UmbManifestTreeMeta {
-  section: string;
-  weight: number;
-}
-
 export class UmbExtensionRegistry {
   private _extensions: BehaviorSubject<Array<UmbExtensionManifest<unknown>>> = new BehaviorSubject(<Array<UmbExtensionManifest<unknown>>>[]);
   public readonly extensions: Observable<Array<UmbExtensionManifest<unknown>>> = this._extensions.asObservable();