diff --git a/packages/core/package.json b/packages/core/package.json
index c4daa5a6..f5d4d4e6 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@dark-engine/core",
-  "version": "0.9.15",
+  "version": "0.10.0",
   "description": "Dark is lightweight (10 Kb gzipped) component-and-hook-based UI rendering engine for javascript apps without dependencies and written in TypeScript 💫",
   "author": "AlexPlex",
   "license": "MIT",
diff --git a/packages/core/src/use-reactive-state/use-reactive-state.ts b/packages/core/src/use-reactive-state/use-reactive-state.ts
index 8acbbfa4..95867b77 100644
--- a/packages/core/src/use-reactive-state/use-reactive-state.ts
+++ b/packages/core/src/use-reactive-state/use-reactive-state.ts
@@ -28,8 +28,8 @@ function reactive<T extends object>(value: T, scope: Scope, update: () => void):
 
         target[prop] = reactive(value, scope, update);
 
-        scope.timerId && clearTimeout(scope.timerId);
-        scope.timerId = setTimeout(() => {
+        scope.timerId && window.clearTimeout(scope.timerId);
+        scope.timerId = window.setTimeout(() => {
           update();
         });
 
diff --git a/packages/core/types/fiber/fiber.d.ts b/packages/core/types/fiber/fiber.d.ts
index 30cd8f92..9125baee 100644
--- a/packages/core/types/fiber/fiber.d.ts
+++ b/packages/core/types/fiber/fiber.d.ts
@@ -23,7 +23,7 @@ declare class Fiber<N = NativeElement> {
   marker: string;
   isUsed: boolean;
   idx: number;
-  batched: Array<() => void>;
+  batched: () => void | null;
   catchException: (error: Error) => void;
   constructor(options: Partial<Fiber<N>>);
   markPortalHost(): void;
diff --git a/packages/core/types/index.d.ts b/packages/core/types/index.d.ts
index e9e9f6c1..e0f92adb 100644
--- a/packages/core/types/index.d.ts
+++ b/packages/core/types/index.d.ts
@@ -22,8 +22,9 @@ export { useLayoutEffect } from './use-layout-effect';
 export * from './use-memo';
 export * from './use-reducer';
 export * from './use-ref';
-export * from './use-state';
 export * from './use-update';
+export * from './use-state';
+export * from './use-reactive-state';
 export * from './view';
 export * from './constants';
 export { walkFiber } from './walk';
diff --git a/packages/core/types/use-event/use-event.d.ts b/packages/core/types/use-event/use-event.d.ts
index 0e947a48..31f89dfa 100644
--- a/packages/core/types/use-event/use-event.d.ts
+++ b/packages/core/types/use-event/use-event.d.ts
@@ -1,2 +1,2 @@
-declare function useEvent<T extends (...args: any[]) => any>(fn: T): T;
+declare function useEvent<T extends (...args: Array<any>) => any>(fn: T): T;
 export { useEvent };
diff --git a/packages/core/types/use-reactive-state/index.d.ts b/packages/core/types/use-reactive-state/index.d.ts
new file mode 100644
index 00000000..f09e4504
--- /dev/null
+++ b/packages/core/types/use-reactive-state/index.d.ts
@@ -0,0 +1 @@
+export * from './use-reactive-state';
diff --git a/packages/core/types/use-reactive-state/use-reactive-state.d.ts b/packages/core/types/use-reactive-state/use-reactive-state.d.ts
new file mode 100644
index 00000000..b80491a2
--- /dev/null
+++ b/packages/core/types/use-reactive-state/use-reactive-state.d.ts
@@ -0,0 +1,2 @@
+declare function useReactiveState<T extends object>(value: T): T;
+export { useReactiveState };
diff --git a/packages/core/types/use-state/use-state.d.ts b/packages/core/types/use-state/use-state.d.ts
index 78d573bb..1679d5f8 100644
--- a/packages/core/types/use-state/use-state.d.ts
+++ b/packages/core/types/use-state/use-state.d.ts
@@ -1,7 +1,7 @@
 import { type ScheduleCallbackOptions } from '../platform';
 declare type Value<T> = T | ((prevValue: T) => T);
 declare function useState<T = unknown>(
-  initialValue: T,
+  initialValue: T | (() => T),
   options?: ScheduleCallbackOptions,
 ): [T, (value: Value<T>) => void];
 export { useState };
diff --git a/packages/platform-browser/package.json b/packages/platform-browser/package.json
index 0e7c1a1e..d9256e2d 100644
--- a/packages/platform-browser/package.json
+++ b/packages/platform-browser/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@dark-engine/platform-browser",
-  "version": "0.9.15",
+  "version": "0.10.0",
   "description": "Dark is lightweight (10 Kb gzipped) component-and-hook-based UI rendering engine for javascript apps without dependencies and written in TypeScript 💫",
   "author": "AlexPlex",
   "license": "MIT",