/**
 * Internationalization (i18n) support for OPC Agent.
 * Supports English, Chinese, and Japanese.
 */
export type Locale = 'en' | 'zh-CN' | 'ja';
export interface I18nMessages {
    [key: string]: string;
}
export declare function setLocale(locale: Locale): void;
export declare function getLocale(): Locale;
export declare function getSupportedLocales(): {
    code: Locale;
    label: string;
}[];
export declare function t(key: string, params?: Record<string, string>): string;
export declare function detectLocale(): Locale;
export declare function addMessages(locale: Locale, newMessages: I18nMessages): void;
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