import Day from './Day';
import Environment from './Environment';
export default class Model {
    private _checkInDate;
    private _checkOutDate;
    constructor(checkInDate: Day, checkOutDate: Day);
    readonly checkInDate: Day;
    readonly checkOutDate: Day;
    newCheckIn(checkInDate: string, environment: Environment): Model;
    newCheckOut(checkOutDate: string, environment: Environment): Model;
    nightsCount(): number;
}