/**
 * 企业级CDN高可用加载器
 * 基于团队建议实现的多源回退、预取固定、缓存优化机制
 * 目标：将CDN可用率从88.9%提升到99.9%+
 */
export interface CDNConfig {
    urls: string[];
    cacheKey?: string;
    timeout?: number;
    retryCount?: number;
    retryDelay?: number;
}
export interface LoadResult<T = any> {
    module: T;
    sourceUrl: string;
    pinnedUrl?: string;
    fromCache: boolean;
    timing: {
        total: number;
        fetch?: number;
        import?: number;
    };
}
/**
 * 多源CDN高可用加载器
 * 特性：缓存pinned URL、优雅降级、错误恢复、性能监控
 */
export declare function importFirst<T = any>(config: CDNConfig): Promise<LoadResult<T>>;
/**
 * 预构建的CDN配置 - 基于团队建议的最佳实践
 */
export declare const CDN_CONFIGS: {
    core: {
        urls: string[];
        cacheKey: string;
    };
    react: {
        urls: string[];
        cacheKey: string;
    };
    vue: {
        urls: string[];
        cacheKey: string;
    };
    selectorReact: {
        urls: string[];
        cacheKey: string;
    };
};
/**
 * 便捷的包加载函数
 */
export declare function loadUI18nCore(): Promise<LoadResult<any>>;
export declare function loadUI18nReact(): Promise<LoadResult<any>>;
export declare function loadUI18nVue(): Promise<LoadResult<any>>;
export declare function loadUI18nSelectorReact(): Promise<LoadResult<any>>;
/**
 * 批量预热CDN - 减少用户首次访问的500错误
 */
export declare function preWarmCDN(packages?: string[]): Promise<PromiseSettledResult<{
    package: string;
    status: string;
    reason: string;
    results?: undefined;
    error?: undefined;
} | {
    package: string;
    status: string;
    results: PromiseSettledResult<{
        url: string;
        status: number;
        ok: boolean;
    }>[];
    reason?: undefined;
    error?: undefined;
} | {
    package: string;
    status: string;
    error: any;
    reason?: undefined;
    results?: undefined;
}>[]>;
/**
 * CDN健康检查 - 用于CI和监控
 */
export declare function healthCheck(): Promise<{
    overall: 'healthy' | 'degraded' | 'critical';
    details: Array<{
        package: string;
        url: string;
        status: 'ok' | 'slow' | 'error';
        responseTime: number;
        error?: string;
    }>;
}>;
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