/**
 * Supported languages in BCP 47 format
 */
export declare const SUPPORTED_LANGUAGES: readonly ["en-US", "es-ES", "ja-JP", "vi-VN", "zh-CN", "zh-HK", "zh-TW"];
/**
 * Validates language code format (BCP 47: xx-XX)
 * @param languageCode - The language code to validate
 * @returns true if valid
 * @throws ValidationError if invalid
 */
export declare function validateLanguageCode(languageCode: string): boolean;
/**
 * Get language code display name
 */
export declare function getLanguageName(code: string): string;
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