/**
 * 离线优化工具
 * 快速fallback和缓存策略
 */
import { PlatformAdapter } from './adapters/platform-adapter';
export interface OfflineConfig {
    fallbackTimeout: number;
    maxRetries: number;
    cacheStrategy: 'aggressive' | 'conservative';
    enableServiceWorker: boolean;
}
export declare class OfflineOptimizer {
    private config;
    private fallbackCache;
    private lastOnlineTime;
    private platform;
    private onlineListener?;
    private offlineListener?;
    constructor(config?: Partial<OfflineConfig>, platformAdapter?: PlatformAdapter);
    /**
     * 设置离线检测
     */
    private setupOfflineDetection;
    /**
     * 启用离线模式
     */
    private enableOfflineMode;
    /**
     * 预加载关键资源
     */
    private preloadCriticalResources;
    /**
     * 快速离线翻译
     */
    quickOfflineTranslate(key: string, fallback?: string): Promise<string>;
    /**
     * 从本地存储获取翻译
     */
    private getFromLocalStorage;
    /**
     * 缓存翻译结果
     */
    cacheTranslation(key: string, value: string, language: string): void;
    /**
     * 智能重试机制
     */
    smartRetry<T>(operation: () => Promise<T>, context: string): Promise<T>;
    /**
     * 检查是否为网络错误
     */
    private isNetworkError;
    /**
     * 获取离线状态信息
     */
    getOfflineStatus(): {
        isOnline: boolean;
        lastOnlineTime: number;
        offlineDuration: number;
        cacheSize: number;
    };
    /**
     * 清理过期缓存
     */
    cleanupCache(): void;
    /**
     * 清理资源并移除事件监听器
     */
    cleanup(): void;
}
/**
 * 设置全局离线优化器实例（用于测试和自定义配置）
 */
export declare function setGlobalOfflineOptimizer(optimizer: OfflineOptimizer): void;
/**
 * 重置全局离线优化器实例（主要用于测试）
 */
export declare function resetGlobalOfflineOptimizer(): void;
export declare const quickTranslate: (key: string, fallback?: string) => Promise<string>;
export declare const cacheTranslation: (key: string, value: string, language: string) => void;
export declare const smartRetry: <T>(operation: () => Promise<T>, context: string) => Promise<T>;
export declare const offlineOptimizer: {
    readonly instance: OfflineOptimizer;
};
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