import { BehaviorSubject } from 'rxjs';
import { IStore } from './IStore';
export declare type IStateUpdaterFunc<State extends object> = (state: State) => Partial<State>;
export declare type IStateUpdater<State extends object> = Partial<State> | IStateUpdaterFunc<State>;
/**
 * Prostore which uses BehaviorSubject to hold its state.
 * It mimics the React class component state management.
 * You can use setState to change part of the state of the store.
 *
 * It performs synchronous state updates which means that two consequent calls to setState
 * will result in dispatching two store updates.
 */
export declare class BehaviorStore<State extends object> implements IStore<State> {
    state$: BehaviorSubject<State>;
    get state(): State;
    constructor(initialState: State);
    /**
     * This callback is called when the first subscriber subscribes to this store.
     * It may be called multiple times during the lifetime of the store.
     * You can use it to perform side-effects like subscribing to other
     * observables.
     */
    onSubscribe(): void;
    /**
     * This callback is called when the last subscriber unsubscribes from this store.
     * It may be called multiple times during the lifetime of the store.
     * You can use it to cleanup side-effects created during onSubscribe.
     */
    onUnsubscribe(): void;
    /**
     * Update part of the store state.
     *
     * @param stateUpdate - object containing partial state update or updater function.
     *  If the function is provided, it is called with the current state and should return the partial state update
     */
    setState(stateUpdate: IStateUpdater<State>): void;
    _applyStateUpdater(state: State, stateUpdate: IStateUpdater<State>): State;
}