import { IsoDate, IsoDateTime, IsoDuration, IsoInstant, IsoTime, IsoYearMonth } from './iso-types';
declare function add(instant: IsoInstant, duration: {
    hours?: number;
    minutes?: number;
    seconds?: number;
    milliseconds?: number;
}): IsoInstant;
declare function add(instant: IsoInstant, duration: IsoDuration): IsoInstant;
declare function add(dateTime: IsoDateTime, duration: {
    years?: number;
    months?: number;
    weeks?: number;
    days?: number;
    hours?: number;
    minutes?: number;
    seconds?: number;
    milliseconds?: number;
}, options?: {
    overflow?: 'constrain' | 'reject';
}): IsoDateTime;
declare function add(dateTime: IsoDateTime, duration: IsoDuration, options?: {
    overflow?: 'constrain' | 'reject';
}): IsoDateTime;
declare function add(date: IsoDate, duration: {
    years?: number;
    months?: number;
    weeks?: number;
    days?: number;
}, options?: {
    overflow?: 'constrain' | 'reject';
}): IsoDate;
declare function add(date: IsoDate, duration: IsoDuration, options?: {
    overflow?: 'constrain' | 'reject';
}): IsoDate;
declare function add(time: IsoTime, duration: {
    hours?: number;
    minutes?: number;
    seconds?: number;
    milliseconds?: number;
}): IsoTime;
declare function add(time: IsoTime, duration: IsoDuration): IsoTime;
declare function add(yearMonth: IsoYearMonth, duration: {
    years?: number;
    months?: number;
}, options?: {
    overflow?: 'constrain' | 'reject';
}): IsoYearMonth;
declare function add(yearMonth: IsoYearMonth, duration: IsoDuration, options?: {
    overflow?: 'constrain' | 'reject';
}): IsoYearMonth;
declare function add(duration1: IsoDuration, duration2: IsoDuration, options?: {
    relativeTo?: IsoDateTime | IsoDate;
}): IsoDuration;
export default add;