/**
 * https://tc39.es/ecma402/#sec-isvalidtimezonename
 * @param tz
 * @param implDetails implementation details
 */
export declare function IsValidTimeZoneName(tz: string, { zoneNamesFromData, uppercaseLinks, }: {
    zoneNamesFromData: readonly string[];
    uppercaseLinks: Record<string, string>;
}): boolean;
