diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..1d92d2c
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,8 @@
+import { Duplex } from "stream";
+import WebSocket from 'ws';
+
+declare class WebSocketJSONStream extends Duplex {
+  constructor(ws: WebSocket);
+}
+
+export default WebSocketJSONStream;