import { Observable } from 'rxjs';
export type CreateSelectFnReturn<StateType extends object> = {
    (): Observable<StateType>;
    <R>(mapFn: (state: StateType) => R): Observable<R>;
    <KeyType extends keyof StateType>(key: KeyType): Observable<StateType[KeyType]>;
};
export declare function createState<StateType extends object>(initialState: StateType): {
    select: CreateSelectFnReturn<StateType>;
    get: () => StateType;
    set: (v: StateType) => void;
};
export declare function createLazyState<StateType extends object>(initialState?: StateType): {
    select: CreateSelectFnReturn<StateType>;
    get: () => StateType | undefined;
    set: (v: StateType) => void;
};