import { LanguageTag } from '@phensley/language-tag';
import { FastTag } from './util';
/**
 * Since a lot of comparisons will be done, we need fast access to
 * core fields of LanguageTag without exposing the raw fields.
 *
 * Visible for testing
 */
export declare const fastTag: (real: LanguageTag) => FastTag;
/**
 * Return a language tag, combining the fast tag's core subtags with the
 * original's additional subtags.
 *
 * Visible for testing
 */
export declare const returnTag: (real: LanguageTag, fast: FastTag) => LanguageTag;
/**
 * Methods for substituting language and region aliases, adding likely subtags, etc.
 *
 * @public
 */
export declare class LanguageResolver {
    /**
     * Substitute aliases only.
     */
    static substituteAliases(real: string | LanguageTag): LanguageTag;
    /**
     * Substitute all relevant aliases, and then add likely subtags.
     */
    static resolve(real: string | LanguageTag): LanguageTag;
    /**
     * Add any missing subtags using the likely subtags mapping. For example,
     * this would convert "en" to "en-Latn-US".
     */
    static addLikelySubtags(real: string | LanguageTag): LanguageTag;
    /**
     * Remove any subtags that would be added by addLikelySubtags() above. For example,
     * this would convert "en-Latn-US" to "en".
     */
    static removeLikelySubtags(real: string | LanguageTag): LanguageTag;
}