diff --git a/decap-cms-login-script.js b/decap-cms-login-script.ts
similarity index 93%
rename from decap-cms-login-script.js
rename to decap-cms-login-script.ts
index 6bb5532..c6ca484 100644
--- a/decap-cms-login-script.js
+++ b/decap-cms-login-script.ts
@@ -1,5 +1,5 @@
 // Original version – https://github.com/vencax/netlify-cms-github-oauth-provider/blob/master/login_script.js
-export default function (token) {
+export default function (token: string) {
   return `<script>
 (function() {
   function receiveMessage(e) {