diff --git a/baseStore.ts b/baseStore.ts
index 9fc2110..c4db262 100644
--- a/baseStore.ts
+++ b/baseStore.ts
@@ -1,17 +1,17 @@
-export type BaseStoreListenerInit<Derived extends BaseStore> = {
+export type BaseStoreListenerInit<Event, Derived extends BaseStore<Event>> = {
   store: Derived;
-  event: string;
+  event: Event;
 };
-export type BaseStoreListener<Derived extends BaseStore> = (
-  init: BaseStoreListenerInit<Derived>,
+export type BaseStoreListener<Event, Derived extends BaseStore<Event>> = (
+  init: BaseStoreListenerInit<Event, Derived>,
 ) => void;
-export declare class BaseStore {
+export declare class BaseStore<Event = string> {
   constructor();
 
-  public addChangeListener(listener: BaseStoreListener<this>): void;
-  public removeChangeListener(listener: BaseStoreListener<this>): void;
+  public addChangeListener(listener: BaseStoreListener<Event, this>): void;
+  public removeChangeListener(listener: BaseStoreListener<Event, this>): void;
   public emitChange(event: string): void;
   public get listenersCount(): number;
 
-  private _onChangeListeners: BaseStoreListener<this>[];
+  private _onChangeListeners: BaseStoreListener<Event, this>[];
 }