diff --git a/src/providers/RouterProvider.tsx b/src/providers/RouterProvider.tsx
index 109d971..e70ce13 100644
--- a/src/providers/RouterProvider.tsx
+++ b/src/providers/RouterProvider.tsx
@@ -193,7 +193,7 @@ export function RouterProvider({
 
         // Check storage for pending context menu data
         storageUtil
-          .get('contextMenu/pendingData', undefined)
+          .get('contextMenu/pendingData')
           .then((pendingData) => {
             if (
               pendingData &&
diff --git a/src/utils/__tests__/chromeStorage.test.ts b/src/utils/__tests__/chromeStorage.test.ts
index aeba7c7..cb4f0d5 100644
--- a/src/utils/__tests__/chromeStorage.test.ts
+++ b/src/utils/__tests__/chromeStorage.test.ts
@@ -1,4 +1,4 @@
-import { describe, expect, it } from 'vitest';
+import { describe, expect, it, expectTypeOf } from 'vitest';
 import { storageUtil } from '@/utils/chromeStorage';
 
 describe('chromeStorage', () => {
@@ -75,6 +75,20 @@ describe('chromeStorage', () => {
     });
   });
 
+  describe('get 类型签名', () => {
+    it('无默认值时应推断为可选返回类型', () => {
+      const getWithoutDefault = () => storageUtil.get('app/theme');
+      expectTypeOf<ReturnType<typeof getWithoutDefault>>().toEqualTypeOf<
+        Promise<string | undefined>
+      >();
+    });
+
+    it('有默认值时应推断为确定返回类型', () => {
+      const getWithDefault = () => storageUtil.get('app/theme', 'light');
+      expectTypeOf<ReturnType<typeof getWithDefault>>().toEqualTypeOf<Promise<string>>();
+    });
+  });
+
   describe('set', () => {
     it('应该成功设置字符串值', async () => {
       (chrome.storage.local.set as any).mockResolvedValue(undefined);
diff --git a/src/utils/chromeStorage.ts b/src/utils/chromeStorage.ts
index df9ec17..4e46085 100644
--- a/src/utils/chromeStorage.ts
+++ b/src/utils/chromeStorage.ts
@@ -1,12 +1,12 @@
 import { StorageSchema } from '@/types/storage';
 
 class StorageUtils {
-  async get<K extends keyof StorageSchema>(key: K): Promise<StorageSchema[K]>;
-
   async get<K extends keyof StorageSchema>(
     key: K,
-    defaultValue?: StorageSchema[K],
-  ): Promise<StorageSchema[K] | undefined>;
+    defaultValue: StorageSchema[K],
+  ): Promise<StorageSchema[K]>;
+
+  async get<K extends keyof StorageSchema>(key: K): Promise<StorageSchema[K] | undefined>;
 
   /**
    * 获取值
@@ -19,7 +19,10 @@ class StorageUtils {
     defaultValue?: StorageSchema[K],
   ): Promise<StorageSchema[K] | undefined> {
     const result = await chrome.storage.local.get([key]);
-    return (result[key] ?? defaultValue) as StorageSchema[K] | undefined;
+    if (defaultValue !== undefined) {
+      return (result[key] ?? defaultValue) as StorageSchema[K];
+    }
+    return result[key] as StorageSchema[K] | undefined;
   }
 
   /**
diff --git a/src/utils/useContextMenuData.ts b/src/utils/useContextMenuData.ts
index ecc7ea2..d26b2ae 100644
--- a/src/utils/useContextMenuData.ts
+++ b/src/utils/useContextMenuData.ts
@@ -26,7 +26,7 @@ export function useContextMenuData({ featureKey, onData }: UseContextMenuDataOpt
   useEffect(() => {
     const checkAndConsumeData = async () => {
       try {
-        const data = await storageUtil.get(STORAGE_KEY, undefined);
+        const data = await storageUtil.get(STORAGE_KEY);
 
         if (!data) return;
 
@@ -55,7 +55,7 @@ export function useContextMenuData({ featureKey, onData }: UseContextMenuDataOpt
         if (newData && newData.featureKey === featureKey) {
           void (async () => {
             try {
-              const data = await storageUtil.get(STORAGE_KEY, undefined);
+              const data = await storageUtil.get(STORAGE_KEY);
               if (!data) return;
               if (data.featureKey !== featureKey) return;
               if (Date.now() - data.timestamp > CONTEXT_MENU_DATA_EXPIRY_MS) {