import { BaseObservableValue } from "./index";
import { BaseObservableMap, IMapObserver } from "../map/BaseObservableMap";
export declare class PickMapObservableValue<K, V> extends BaseObservableValue<V | undefined> implements IMapObserver<K, V> {
    private readonly map;
    private readonly pickKey;
    private key?;
    private mapSubscription?;
    constructor(map: BaseObservableMap<K, V>, pickKey?: (currentKey: K, newKey: K) => boolean);
    private updateKey;
    onReset(): void;
    onAdd(key: K, value: V): void;
    onUpdate(key: K, value: V, params: any): void;
    onRemove(key: K, value: V): void;
    onSubscribeFirst(): void;
    onUnsubscribeLast(): void;
    get(): V | undefined;
}