/** @fork https://github.com/sozialhelden/ietf-language-tags */
export interface ILanguageSubtag {
    langtag?: string;
    language?: string;
    extlang?: string;
    script?: string;
    region?: string;
    variants?: string[];
    extensions?: Record<string, string>;
    privateuse?: string;
}
/** @fork https://github.com/sozialhelden/ietf-language-tags */
export declare const parseLangAttribute: (attr: string) => ILanguageSubtag | null;
