import { BaseNotifier } from './base';
import { Subscriber, Unsubscribe } from '../subjects/subject';
export interface SelectorStatus {
    pending: boolean;
    error: unknown | null;
}
type SelectorHook<State> = ReturnType<typeof selector<State>>;
type SelectorFunc<State, ReturnType> = (state: State) => ReturnType;
type UseNotifierHook<State> = <ReturnType = State>(selector?: SelectorFunc<State, ReturnType>) => ReturnType;
type GetFunction = <NotifierState>(notifier: BaseNotifier<NotifierState & object> | SelectorHook<NotifierState>) => Readonly<NotifierState>;
type SetFunction = <NotifierState extends object>(notifier: BaseNotifier<NotifierState>, state: NotifierState) => void;
type SelectorHandler<ReturnedState> = (get: GetFunction, set: SetFunction) => Promise<ReturnedState> | ReturnedState;
export declare function selector<ReturnedState>(selectorFn: SelectorHandler<ReturnedState>): {
    subscribe: (subscriber: Subscriber<ReturnedState>) => Unsubscribe;
    subscribeStatus: (subscriber: Subscriber<SelectorStatus>) => Unsubscribe;
    getStatus: () => SelectorStatus;
    getServerSnapshot: () => ReturnedState;
    getSnapshot: () => ReturnedState;
    createStateHook: () => UseNotifierHook<ReturnedState>;
    createStatusHook: () => () => SelectorStatus;
    destroy: () => void;
};
export declare const getSnapshot: GetFunction;
export {};