diff --git a/src/Updux.ts b/src/Updux.ts
index ffa5084..a776021 100644
--- a/src/Updux.ts
+++ b/src/Updux.ts
@@ -25,6 +25,8 @@ export type DuxStateSubduxes<C extends {}> = keyof C extends never
     ? unknown
     : { [K in keyof C]: StateOf<C[K]> };
 
+type DuxAggregateState<TState,TSubduxes> = TState & DuxStateSubduxes<TSubduxes> ;
+
 export class Updux<TState extends any = {}, TActions extends { [key: string]: ActionGenerator } = {}, TSubduxes = {}> {
     #localInitial: any = {};
     #subduxes;
@@ -41,7 +43,7 @@ export class Updux<TState extends any = {}, TActions extends { [key: string]: Ac
         return this.#actions;
     }
 
-    get initial(): TState & DuxStateSubduxes<TSubduxes> {
+    get initial(): DuxAggregateState<TState,TSubduxes>{
         if (Object.keys(this.#subduxes).length === 0) return this.#localInitial;
 
         return Object.assign(
@@ -52,6 +54,6 @@ export class Updux<TState extends any = {}, TActions extends { [key: string]: Ac
     }
 
     get reducer() {
-        return (state, action) => state;
+        return (state : DuxAggregateState<TState,TSubduxes>, _action : any) => state;
     }
 }
diff --git a/src/reducer.test.ts b/src/reducer.test.ts
index 82a1e15..838247e 100644
--- a/src/reducer.test.ts
+++ b/src/reducer.test.ts
@@ -3,7 +3,7 @@ import { test, expect } from 'vitest';
 import { Updux } from './Updux.js';
 
 test('basic reducer', () => {
-    const dux = new Updux({});
+    const dux = new Updux({ initial: {a: 3} });
 
     expect(dux.reducer).toBeTypeOf('function');