deep clone object

libs/aws/reverse-proxy/update-proxy.ts

@@ -81,8 +81,13 @@ export function updateProxy(props: UpdateProxyProps): cr.AwsCustomResource {
     stackName,
   };
 
-  const onDeleteSdkCall = {...sdkCall};
-  onDeleteSdkCall.parameters.Message = JSON.stringify(onDeleteMessage);
+  const onDeleteSdkCall: cr.AwsSdkCall = {
+    ...sdkCall,
+    parameters: {
+      ...sdkCall.parameters,
+      Message: JSON.stringify(onDeleteMessage),
+    },
+  };
 
   return new cr.AwsCustomResource(props.scope, `${props.id}SnsReverseProxy`, {
     onCreate: sdkCall,