Cast mock channel to proper Channel

Author: ghengeveld

code/core/src/manager/index.stories.tsx

@@ -18,7 +18,7 @@ import Provider from './provider';
 
 const WS_DISCONNECTED_NOTIFICATION_ID = 'CORE/WS_DISCONNECTED';
 
-const channel = mockChannel();
+const channel = mockChannel() as unknown as Channel;
 
 const originalGetItem = Storage.prototype.getItem;
 const originalSetItem = Storage.prototype.setItem;