/// <reference types="react" />
import { PeriodParameters } from './types';
export declare const useFirstPeriod: (params: PeriodParameters) => {
    year: number;
    month: number;
    selectedDate: Date | undefined;
    setSelectedDate: import("react").Dispatch<import("react").SetStateAction<Date | undefined>>;
    inputValue: string | undefined;
    setInputValue: import("react").Dispatch<import("react").SetStateAction<string | undefined>>;
    numberOfDays: number;
    dayOfStart: number;
    prev: () => void;
    next: () => void;
};