Add node done API

packages/node_modules/@node-red/runtime/lib/nodes/flows/index.js

@@ -729,6 +729,10 @@ module.exports = {
     updateFlow: updateFlow,
     removeFlow: removeFlow,
     disableFlow:null,
-    enableFlow:null
+    enableFlow:null,
+    isDeliveryModeAsync: function() {
+        // If settings is null, this is likely being run by unit tests
+        return !settings || !settings.runtimeSyncDelivery
+    }
 
 };