/**
 * Helper functions to determine which languages the app supports
 * This combines built-in languages with auto-discovered app languages
 */
import type { I18nInstance } from '../core/types.js';
/**
 * Get all languages that the app supports (for language switching)
 * This includes:
 * 1. Built-in app languages (from the main app instance)
 * 2. Auto-discovered app languages (from index.json)
 *
 * This explicitly excludes package languages as packages should follow
 * the app's language selection.
 */
export declare function getAppSupportedLanguages(i18n: I18nInstance, translationsPath?: string): Promise<string[]>;
/**
 * Check if a language is supported by the app
 */
export declare function isAppLanguageSupported(i18n: I18nInstance, locale: string, translationsPath?: string): Promise<boolean>;