diff --git a/platform/core/src/services/_shared/pubSubServiceInterface.ts b/platform/core/src/services/_shared/pubSubServiceInterface.ts
index 15bf7a476..822f969af 100644
--- a/platform/core/src/services/_shared/pubSubServiceInterface.ts
+++ b/platform/core/src/services/_shared/pubSubServiceInterface.ts
@@ -89,6 +89,13 @@ function _broadcastEvent(eventName, callbackProps) {
 
 /** Export a PubSubService class to be used instead of the individual items */
 export class PubSubService {
+  EVENTS: any;
+  subscribe: (eventName: string, callback: Function) => { unsubscribe: () => any; };
+  _broadcastEvent: (eventName: string, callbackProps: any) => void;
+  _unsubscribe: (eventName: string, listenerId: string) => void;
+  _isValidEvent: (eventName: string) => boolean;
+  listeners: {};
+  unsubscriptions: any[];
   constructor(EVENTS) {
     this.EVENTS = EVENTS;
     this.subscribe = subscribe;