diff --git a/packages/misskey-js/test-d/schemas.ts b/packages/misskey-js/test-d/schemas.ts
new file mode 100644
index 000000000..0152dd20e
--- /dev/null
+++ b/packages/misskey-js/test-d/schemas.ts
@@ -0,0 +1,95 @@
+import { Packed, Def } from '../src/schemas';
+// import { expectType } from 'tsd';
+
+describe('schemas', () => {
+    test('user', () => {
+        type UserLite = Packed<'UserLite'>;
+        /* Error: is declared too wide for argument type
+        expectType<UserLite>({
+            id: 'string',
+            name: null,
+            username: 'string',
+            host: null,
+            avatarUrl: 'string',
+            avatarBlurhash: 'string',
+            isAdmin: false,
+            isModerator: false,
+            isBot: false,
+            isCat: false,
+            onlineStatus: null,
+        });
+        */
+        type UserDetailedNotMeOnly = Packed<'UserDetailedNotMeOnly'>;
+        type UserDetailedNotMe = Packed<'UserDetailedNotMe'>;
+        type MeDetailed = Packed<'MeDetailed'>;
+        type User = Packed<'User'>;
+        type UserDetailed = Packed<'UserDetailed'>;
+    });
+    test('user list', () => {
+        type UserList = Packed<'UserList'>;
+    });
+    test('app', () => {
+        type App = Packed<'App'>;
+    });
+    test('note', () => {
+        type Note = Packed<'Note'>;
+    });
+    test('note reaction', () => {
+        type NoteReaction = Packed<'NoteReaction'>;
+    });
+    test('note favorite', () => {
+        type NoteFavorite = Packed<'NoteFavorite'>;
+    });
+    test('notification', () => {
+        type Notification = Packed<'Notification'>;
+    });
+    test('drive file', () => {
+        type DriveFile = Packed<'DriveFile'>;
+    });
+    test('drive folder', () => {
+        type DriveFolder = Packed<'DriveFolder'>;
+    });
+    test('following', () => {
+        type Following = Packed<'Following'>;
+    });
+    test('muting', () => {
+        type Muting = Packed<'Muting'>;
+    });
+    test('renote muting', () => {
+        type RenoteMuting = Packed<'RenoteMuting'>;
+    });
+    test('blocking', () => {
+        type Blocking = Packed<'Blocking'>;
+    });
+    test('hashtag', () => {
+        type Hashtag = Packed<'Hashtag'>;
+    });
+    test('page', () => {
+        type Page = Packed<'Page'>;
+    });
+    test('channel', () => {
+        type Channel = Packed<'Channel'>;
+    });
+    test('queue count', () => {
+        type QueueCount = Packed<'QueueCount'>;
+    });
+    test('antenna', () => {
+        type Antenna = Packed<'Antenna'>;
+    });
+    test('clip', () => {
+        type Clip = Packed<'Clip'>;
+    });
+    test('federation instance', () => {
+        type FederationInstance = Packed<'FederationInstance'>;
+    });
+    test('gallery post', () => {
+        type GalleryPost = Packed<'GalleryPost'>;
+    });
+    test('emoji', () => {
+        type EmojiSimple = Packed<'EmojiSimple'>;
+        type EmojiDetailed = Packed<'EmojiDetailed'>;
+    });
+    test('flash', () => {
+        type Flash = Packed<'Flash'>;
+    });
+});