import { I18nConfig } from './types';
/**
 * Language translation utility.
 */
export declare class I18n {
    /**
     * @private
     */
    _options: I18nConfig | null;
    /**
     * @private
     */
    _lang?: string | null;
    /**
     * @private
     */
    _dict: Record<string, any>;
    /**
     * Sets the default language from the configuration when required.
     */
    setDefaultLanguage(): void;
    /**
     * @method
     * Explicitly setting language
     * @param {String} lang
     */
    setLanguage(lang: string): void;
    /**
     * @method
     * Get value
     * @param {String} key
     * @param {String} defVal - Default value
     */
    get(key: string, defVal?: string | undefined): any;
    /**
     * @method
     * Get value according to specified language
     * @param {String} key
     * @param {String} language - Specified langurage to be used
     * @param {String} defVal - Default value
     */
    getByLanguage(key: string, language: string, defVal?: string | null): any;
    /**
     * @method
     * Add vocabularies for one language
     * @param {String} language - Language of the dictionary
     * @param {Object} vocabularies - Object that has key-value as dictionary entry
     */
    putVocabulariesForLanguage(language: string, vocabularies: Record<string, any>): void;
    /**
     * @method
     * Add vocabularies for one language
     * @param {Object} vocabularies - Object that has language as key,
     *                                vocabularies of each language as value
     */
    putVocabularies(vocabularies: Record<string, Record<string, string>>): void;
}