diff --git a/packages/client/src/index.d.ts b/packages/client/src/index.d.ts
new file mode 100644
index 0000000000..7e13670b33
--- /dev/null
+++ b/packages/client/src/index.d.ts
@@ -0,0 +1,5 @@
+interface Window {
+  "##BUDIBASE_APP_ID##": string
+  "##BUDIBASE_IN_BUILDER##": string
+  MIGRATING_APP: boolean
+}