diff --git a/package.json b/package.json
index 8efa1ac..8e85337 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,8 @@
   ],
   "files": [
     "src",
-    "test"
+    "test",
+    "index.d.ts"
   ],
   "author": "plainheart",
   "license": "MIT",