diff --git a/js/index.d.ts b/js/index.d.ts
index 9e6cc65..7fe1451 100644
--- a/js/index.d.ts
+++ b/js/index.d.ts
@@ -1,3 +1,5 @@
+export const Platform = 'AppleHealth' | 'GoogleFit';
+
 const Errors = {
   ErrorHKNotAvailable: -100,
   ErrorMethodNotAvailable: -99,
@@ -26,7 +28,6 @@ const PermissionAccesses = {
 
 export declare type PermissionAccesses = typeof PermissionAccesses[keyof typeof PermissionAccesses];
 
-
 export declare type Permission = {
   kind: PermissionKinds,
   access: PermissionAccesses,