diff --git a/src/esbuild.ts b/src/esbuild.ts
index c08d52f..8713ee7 100644
--- a/src/esbuild.ts
+++ b/src/esbuild.ts
@@ -1,6 +1,6 @@
 import { createEsbuildPlugin } from 'unplugin'
 import type { EsbuildPlugin } from 'unplugin'
 import { unpluginFactory } from './index'
-import type { UnpluginStylexOptions } from './types'
+import type { UnpluginStylexInstance } from './types'
 
-export default createEsbuildPlugin(unpluginFactory) as (options?: UnpluginStylexOptions) => EsbuildPlugin
+export default createEsbuildPlugin(unpluginFactory) as UnpluginStylexInstance<EsbuildPlugin>
diff --git a/src/rspack.ts b/src/rspack.ts
index 2945dfd..6239cf8 100644
--- a/src/rspack.ts
+++ b/src/rspack.ts
@@ -1,6 +1,6 @@
 import { createRspackPlugin } from 'unplugin'
 import type { RspackPluginInstance } from 'unplugin'
 import { unpluginFactory } from './index'
-import type { UnpluginStylexOptions } from './types'
+import type { UnpluginStylexInstance } from './types'
 
-export default createRspackPlugin(unpluginFactory) as (options?: UnpluginStylexOptions) => RspackPluginInstance
+export default createRspackPlugin(unpluginFactory) as UnpluginStylexInstance<RspackPluginInstance>
diff --git a/src/types.ts b/src/types.ts
index db6e2f5..f1cb048 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -24,3 +24,5 @@ export type UnpluginStylexOptions = {
   enforce?: 'post' | 'pre'
   stylex?: StylexOptions
 }
+
+export type UnpluginStylexInstance<T> = (options?: UnpluginStylexOptions) => T
diff --git a/src/vite.ts b/src/vite.ts
index 58f0a29..9c73bfe 100644
--- a/src/vite.ts
+++ b/src/vite.ts
@@ -1,6 +1,6 @@
 import { createVitePlugin } from 'unplugin'
 import type { VitePlugin } from 'unplugin'
 import { unpluginFactory } from './index'
-import type { UnpluginStylexOptions } from './types'
+import type { UnpluginStylexInstance } from './types'
 
-export default createVitePlugin(unpluginFactory) as (option?: UnpluginStylexOptions) => VitePlugin
+export default createVitePlugin(unpluginFactory) as UnpluginStylexInstance<VitePlugin>