diff --git a/packages/analytics-js-service-worker/src/types.ts b/packages/analytics-js-service-worker/src/types.ts
index 9ced48c967..701046949a 100644
--- a/packages/analytics-js-service-worker/src/types.ts
+++ b/packages/analytics-js-service-worker/src/types.ts
@@ -11,8 +11,9 @@ export interface ApiObject {
     | boolean
     | undefined
     | ApiObject
-    | unknown
-    | (string | number | boolean | ApiObject)[];
+    | Date
+    | null
+    | (string | number | boolean | ApiObject | Date | null | undefined)[];
 }
 
 /**