/**
 * I18n — framework dostarcza KONTRAKT, projekt implementuje adapter.
 *
 * Gotowe adaptery opt-in: @echelon-framework/i18n-angular (natywny @angular/localize),
 * @echelon-framework/i18n-transloco, @echelon-framework/i18n-mock.
 *
 * Linter wymusza: literalne stringi w configu dashboardu są błędem
 * (reguła `require-i18n-key`).
 */
import type { Observable } from 'rxjs';
export type Locale = string & {
    readonly _brand: 'Locale';
};
export declare const asLocale: (value: string) => Locale;
export interface I18nService {
    readonly locale$: Observable<Locale>;
    current(): Locale;
    setLocale(locale: Locale): Promise<void>;
    t(key: string, params?: Readonly<Record<string, unknown>>): string;
    formatNumber(value: number, options?: Intl.NumberFormatOptions): string;
    formatDate(value: Date | number, options?: Intl.DateTimeFormatOptions): string;
    formatCurrency(value: number, currency: string, options?: Intl.NumberFormatOptions): string;
}
export declare const I18N: import("../index.js").EchelonToken<I18nService>;
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