import { IObservable } from '@lifaon/rx-js-light';
import { ILocales } from '../locales/locales.type';
import { IRelativeTimeFormatOptions, IRelativeTimeFormatUnit, IRelativeTimeFormatValue } from './relative-time-format.type';
export declare function relativeTimeFormatObservable(value: IObservable<IRelativeTimeFormatValue>, unit: IObservable<IRelativeTimeFormatUnit>, locales: IObservable<ILocales>, options?: IObservable<IRelativeTimeFormatOptions>): IObservable<string>;