import { Strings } from "./util/strings";
import { GlobalAppStatePropertyParameters } from "./appFactory/GlobalAppStateProperty";
/**
 * An object literal. All fields are required,
 * except `getSupportedLanguages` and its fields.
 */
interface LangOptions {
    /**
     * A default language (provided as a lang code)
     * to fall back to if both restoring language
     * preference and auto-detecting language
     * was unsuccessful. `defaultLang` must
     * exist in `defaultSupportedLanguages`.
     */
    defaultLang: string;
    /**
     * An array of lang codes representing the languages
     * that your site/application supports.
     */
    defaultSupportedLanguages: string[];
    /**
     * A function that retrieves string resources.
     * @param lang A lang code
     * @returns String resources for that lang code, either synchronously or asynchronously
     */
    getStrings(lang: string): Strings | Promise<Strings>;
    /**
     * An object literal containing functions that retrieve
     * arrays of lang codes representing the languages
     * that you site/application supports. The arrays
     * returned by these functions override
     * `defaultSupportedLanguages`.
     */
    getSupportedLanguages?: {
        /**
         * A function for retrieving the array of lang codes server-side.
         * @returns The array of lang codes either synchronously or asynchronously
         */
        serverSide?(): string[] | Promise<string[]>;
        /**
         * A function for retrieving the array of lang codes client-side.
         * @returns The array of lang codes either synchronously or asynchronously
         */
        clientSide?(): string[] | Promise<string[]>;
    };
}
/**
 * A ready-made global app state property which constitutes
 * a minimal yet powerful internationalization solution.
 * @param options A `LangOptions` object
 * @returns A `GlobalAppStatePropertyParameters` object
 */
declare function lang(options: LangOptions): GlobalAppStatePropertyParameters<string, Strings>;
export default lang;
//# sourceMappingURL=lang.d.ts.map