import type { StringMap } from '../../types.js';
export type MissingTranslationHandler = (key: string, params?: StringMap<any>) => string;
export declare const defaultMissingTranslationHandler: MissingTranslationHandler;
export interface TranslationServiceCfg {
    defaultLocale: string;
    supportedLocales: string[];
    /**
     * It is allowed to set it later. Will default to `defaultLocale` in that case.
     */
    currentLocale?: string;
    translationLoader: TranslationLoader;
    /**
     * Defaults to `defaultMissingTranslationHandler` that returns `[${key}]` and emits console warning.
     */
    missingTranslationHandler?: MissingTranslationHandler;
}
export interface TranslationServiceCfgComplete extends TranslationServiceCfg {
    missingTranslationHandler: MissingTranslationHandler;
}
export interface TranslationLoader {
    load: (locale: string) => Promise<StringMap>;
}
export declare class TranslationService {
    constructor(cfg: TranslationServiceCfg, preloadedLocales?: StringMap<StringMap>);
    cfg: TranslationServiceCfgComplete;
    /**
     * Cache of loaded locales
     */
    locales: StringMap<StringMap>;
    currentLocale: string;
    /**
     * Manually set locale data, bypassing the TranslationLoader.
     */
    setLocale(localeName: string, locale: StringMap): void;
    getLocale(locale: string): StringMap | undefined;
    /**
     * Loads locale(s) (if not already cached) via configured TranslationLoader.
     * Resolves promise when done (ready to be used).
     */
    loadLocale(locale: string | string[]): Promise<void>;
    /**
     * Will invoke `missingTranslationHandler` on missing tranlation.
     *
     * Does NOT do any locale loading. The locale needs to be loaded beforehand:
     * either pre-loaded and passed to the constructor,
     * or `await loadLocale(locale)`.
     */
    translate(key: string, params?: StringMap): string;
    /**
     * Does NOT invoke `missingTranslationHandler`, returns `undefined` instead.
     */
    translateIfExists(key: string, _params?: StringMap): string | undefined;
}