/**
 * I18n reducer handles all locale/translation state changes.
 *
 * @module i18n/reducer
 */
import type { Reducer } from '../types.js';
import type { I18nState, I18nAction, I18nDependencies } from './types.js';
/**
 * Build fallback chain for a locale.
 * Example: 'pt-BR' → ['pt-BR', 'pt', 'en']
 */
export declare function buildFallbackChain(locale: string, defaultLocale: string): string[];
/**
 * Determine text direction for locale.
 */
export declare function getDirection(locale: string): 'ltr' | 'rtl';
/**
 * I18n reducer handles all locale/translation state changes.
 */
export declare const i18nReducer: Reducer<I18nState, I18nAction, I18nDependencies>;
/**
 * Create initial i18n state.
 */
export declare function createInitialI18nState(locale: string, availableLocales: string[], defaultLocale?: string): I18nState;
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