import { type LocaleFieldsData, type RelativeTimeFormatInternal } from "@formatjs/ecma402-abstract";
export declare function InitializeRelativeTimeFormat(rtf: Intl.RelativeTimeFormat, locales: string | string[] | undefined, options: Intl.RelativeTimeFormatOptions | undefined, { getInternalSlots, availableLocales, relevantExtensionKeys, localeData, getDefaultLocale }: {
	getInternalSlots(rtf: Intl.RelativeTimeFormat): RelativeTimeFormatInternal;
	availableLocales: Set<string>;
	relevantExtensionKeys: string[];
	localeData: Record<string, LocaleFieldsData | undefined>;
	getDefaultLocale(): string;
}): Intl.RelativeTimeFormat;