Type Alias ScanParams<T, TEventMap, TMap>

ScanParams: {
    bivarianceHack: {
        evaluator: Evaluator<T, TMap>;
        trigger: Listenable<EventKeys<TMap>> & Listenable<EventKeys<TEventMap>>;
    } & ScanOptions;
}["bivarianceHack"]

Pass trigger and evaluator as separate arguments to SubscriptionSurface.scan: scan(trigger, evaluator, options?).