import { ArithmeticQuantity } from './base/ArithmeticQuantity';
import { Stringable } from '../Stringable';
declare const ms = "ms";
declare const s = "s";
declare type S = 's';
declare type Ms = 'ms';
declare type DurationSign = S | Ms;
declare class Duration extends ArithmeticQuantity<Ms, Duration> implements Stringable {
    static new<TSign extends DurationSign>(value: number, sign: TSign): Duration;
    toString(): string;
    clone(): Duration;
}
export { Duration, ms, s };
export type { S, Ms };