The app associated with the current
InstanceId service instance.
var app = instanceId.app;
deleteInstanceId(instanceId) returns Promise containing void
Deletes the specified instance ID and the associated data from Firebase.
Note that Google Analytics for Firebase uses its own form of Instance ID to keep track of analytics data. Therefore deleting a regular Instance ID does not delete Analytics data. See Delete an Instance ID for more information.
The instance ID to be deleted.
non-null Promise containing voidA promise fulfilled when the instance ID is deleted.