/// <amd-module name="nova_ecs/event_map" />
export declare class MapEvent<V> {
    value: V;
    private wrappedCancelled;
    constructor(value: V);
    get cancelled(): boolean;
    cancel(): void;
}
export interface SyncSubscription {
    unsubscribe: () => void;
}
declare type Callback<V> = (val: V) => void;
export declare class SyncSubject<V> {
    private subscriptions;
    subscribe(callback: Callback<V>): SyncSubscription;
    next(val: V): void;
}
/**
 * A map that emits events when its contents are changed.
 */
export declare class EventMap<K, V> extends Map<K, V> {
    readonly events: {
        delete: SyncSubject<Set<[K, V]>>;
        set: SyncSubject<[K, V]>;
        setAlways: SyncSubject<[K, V]>;
        add: SyncSubject<[K, V]>;
    };
    clear(): void;
    set(key: K, value: V, silent?: boolean): this;
    delete(key: K): boolean;
}
export {};