import { LanguageTag, ValidationError } from "../types/index.js";
/**
 * Parses a language tag string into its component parts
 * This implements the core parsing functionality according to RFC 5646
 *
 * @param tag The language tag to parse
 * @returns An object representing the parsed language tag, or null if parsing fails
 */
export declare function parseLanguageTag(tag: string): {
    parsed: LanguageTag | null;
    errors: ValidationError[];
};