import { Eq } from "../collections";
export declare class Subscriptions<Sub, SubState> {
    private readonly onAdded;
    private readonly onRemoved;
    private readonly eq;
    private readonly currentSubs;
    constructor(onAdded: Subscriptions.OnAdded<Sub, SubState>, onRemoved: Subscriptions.OnRemoved<Sub, SubState>, eq?: Eq<Sub>);
    update(s: ReadonlyArray<Sub>): void;
    forEach(callback: (sub: Sub, subState: SubState) => void): void;
}
export declare namespace Subscriptions {
    type OnAdded<Value, State> = (sub: Value, currentSubscriptionsCount: number) => State;
    type OnRemoved<Value, State> = (sub: Value, state: State, remainingSubscriptionsCount: number) => void;
}
//# sourceMappingURL=subscriptions.d.ts.map