import { CellValue } from '../core/model.js';
/** Thin wrapper over Intl.* so a future non-JS port has one clear surface to reimplement. */
export declare class I18n {
    locale: string;
    constructor(locale?: string);
    formatNumber(value: number, opts?: Intl.NumberFormatOptions): string;
    formatCurrency(value: number, currency: string): string;
    formatDate(value: Date, opts?: Intl.DateTimeFormatOptions): string;
    formatCell(value: CellValue): string;
    isRtl(): boolean;
}
/**
 * UI-string catalog covering the app chrome (not cell data, which uses Intl
 * directly via I18n above). 30 locales — see src/i18n/locales/*.ts, one file
 * per language. These are best-effort translations of common UI terms, not
 * professionally certified; corrections are welcome (see USAGE.md).
 */
export declare const catalog: Record<string, Record<string, string>>;
/** ISO 639-1 codes for every locale with a catalog entry. */
export declare const localesList: string[];
export declare function t(locale: string, key: string): string;