import { Transaction } from './transaction';
export declare type ObservableUnsubscriber = () => void;
export declare type ObservableSubscriber = (transaction: Transaction) => void;
export declare type ObserverChangeSubscriber = (params: {
    count: number;
}) => void;
export interface Observable<State> {
    get: <Selection = State>(selector?: (val: State) => Selection, transaction?: Transaction) => Selection;
    subscribe: (subscriber: ObservableSubscriber) => ObservableUnsubscriber;
    onObserverChange: (subscriber: ObserverChangeSubscriber) => ObservableUnsubscriber;
}
export declare type ExtractObservableType<Type> = Type extends Observable<infer X> ? X : never;
export declare type ExtractObservableTypes<Map extends ObservableMap> = {
    [K in keyof Map]: ExtractObservableType<Map[K]>;
};
export declare type ObservableMap = Record<string, Observable<any>>;