diff --git a/src/endpoints.ts b/src/endpoints.ts
index c9f89fd438..7c0fe6b836 100644
--- a/src/endpoints.ts
+++ b/src/endpoints.ts
@@ -1,4 +1,4 @@
-import { ID, InstanceMetadata, Note, OriginType, Page, ServerInfo, Stats, User, UserSorting } from './types';
+import { ID, InstanceMetadata, Note, OriginType, Page, ServerInfo, Stats, User, UserSorting } from './entities';
 
 type TODO = Record<string, any>;
 
diff --git a/src/types.ts b/src/entities.ts
similarity index 100%
rename from src/types.ts
rename to src/entities.ts
diff --git a/src/index.ts b/src/index.ts
index 399f8ff1dc..b5f5a5629c 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,13 +1,12 @@
-import { APIClient } from './api';
 import { Endpoints } from './endpoints';
 import Stream from './streaming';
 import { Acct } from './acct';
 
 export {
-	APIClient,
 	Endpoints,
 	Stream,
 	Acct
 };
 
-export * as entities from './types';
+export * as api from './api';
+export * as entities from './entities';
diff --git a/test-d/api.ts b/test-d/api.ts
new file mode 100644
index 0000000000..32357c2a3b
--- /dev/null
+++ b/test-d/api.ts
@@ -0,0 +1,14 @@
+/**
+ * Unit testing TypeScript types.
+ * with https://github.com/SamVerschueren/tsd
+ */
+
+import { expectType } from 'tsd';
+import * as Misskey from '../src';
+
+describe('API', () => {
+	test('returns node that has sprcified type', async () => {
+		const res = await Misskey.api.request('https://misskey.test', 'meta', { detail: true }, 'TOKEN');
+		expectType<Misskey.entities.InstanceMetadata>(res);
+	});
+});
diff --git a/test-d/index.ts b/test-d/index.ts
deleted file mode 100644
index e6fafcc4ff..0000000000
--- a/test-d/index.ts
+++ /dev/null
@@ -1 +0,0 @@
-// RESERVED