/**
 * Get the browser's language.
 *
 * @returns The browser's language.
 * @example
 * // returns 'en-US' or other language code
 * const language = getLanguage();
 */
export declare const getLanguage: () => string;
/**
 * Get a message based on the provided language.
 *
 * @param language - The language code to get the message for.
 * @returns The message for the specified language or a default message if `i18n` is not defined or window is not available.
 * @example
 * const i18n = { en: 'Hello', es: 'Hola' };
 * // returns 'Hello'
 * const message = getMessage('en');
 */
export declare const getMessage: (language?: string) => string;