import type { Locale, RelativeTime } from '../settings/types';
import type { BaseUnit, Duration } from '../typings';
export interface RelativeTimeThreshold {
    l: Exclude<keyof RelativeTime, 'future' | 'past'>;
    r: number;
    d?: BaseUnit;
}
export declare function fromTo(duration: Duration, loc?: Locale['relativeTime'], withoutSuffix?: boolean): string;