import { StateInitializer, Selector, Patcher, Reducer, Unsubscribe, StateModifier, StateUpdater, SetState, UpdateState } from './types';
type Refresh = () => void;
type Observer<ST> = (newState: ST) => void;
type Subscriber<ST> = {
    observer: Observer<ST>;
    selector: Selector<ST>;
    refresh?: Refresh;
};
export default class State<T> {
    private value;
    private subscribers;
    constructor(initialValue: StateInitializer<T> | T);
    getValue<ST>(selector?: Selector<ST>): T | ST;
    refresh(): void;
    setValue(newValue: T | StateUpdater<T>): void;
    setValue<ST>(newValue: ST | StateUpdater<ST>, config: {
        selector?: Selector<ST>;
    }): void;
    setValue<ST>(newValue: ST | StateUpdater<ST>, config: {
        selector?: Selector<ST>;
        patcher?: Patcher<ST>;
    }): void;
    updateValue(stateModifier: StateModifier<T>): void;
    updateValue<ST>(stateModifier: StateModifier<ST>, config: {
        selector?: Selector<ST>;
    }): void;
    updateValue<ST>(stateModifier: StateModifier<ST>, config: {
        selector?: Selector<ST>;
        patcher?: Patcher<ST>;
    }): void;
    private __updateValue;
    subscribe<ST>(itemToSubscribe: Subscriber<T | ST> | Observer<T | ST>): Unsubscribe;
    select<ST>(selector: Selector<ST>): DerivedState<T, ST>;
    useState(config?: {}): [
        state: T,
        setState: SetState<T>,
        updateState: UpdateState<T>,
        stateObject: State<T>
    ];
    useState<ST>(config: {
        selector: Selector<ST>;
    }): [
        state: ST,
        setState: SetState<T>,
        updateState: UpdateState<T>,
        stateObject: State<T>
    ];
    useState<ST>(config: {
        selector: Selector<ST>;
        patcher: Patcher<ST>;
    }): [
        state: ST,
        setState: SetState<ST>,
        updateState: UpdateState<ST>,
        stateObject: State<T>
    ];
    useReducer<_T extends T, A>(reducer: Reducer<_T, A>, config?: {}): [
        state: _T,
        dispatch: (action: A) => void,
        stateObject: State<_T>
    ];
    useReducer<ST, A>(reducer: Reducer<ST, A>, config: {
        selector: Selector<ST>;
    }): [
        state: ST,
        dispatch: (action: A) => void,
        stateObject: State<T>
    ];
    useReducer<ST, A>(reducer: Reducer<ST, A>, config: {
        selector: Selector<ST>;
        patcher: Patcher<ST>;
    }): [
        state: ST,
        dispatch: (action: A) => void,
        stateObject: State<T>
    ];
}
export declare class DerivedState<T, ST> {
    State: State<unknown>;
    selector: Selector<ST>;
    constructor(State: State<unknown>, selector: Selector<ST>);
    getValue(): ST;
    subscribe(observer?: Observer<ST>, refresh?: Refresh): Unsubscribe;
}
export declare function createDerivedState<T, ST>(State: State<T>, selector: Selector<ST>): DerivedState<T, ST>;
export declare function createState<T>(initialValue: StateInitializer<T> | T): State<T>;
export {};