/**
 * 离线 Mermaid 渲染器
 */
export declare class OfflineMermaidRenderer {
    private browserPool;
    private renderCache;
    private localMermaidPath;
    constructor();
    /**
     * 将 Mermaid 代码转换为图片
     */
    renderToImage(mermaidCode: string, options?: {
        timeout?: number;
        useCache?: boolean;
    }): Promise<Buffer>;
    /**
     * 生成 HTML 内容
     */
    private generateHtmlContent;
    /**
     * 生成缓存键
     */
    private generateCacheKey;
    /**
     * 清理缓存
     */
    clearCache(): void;
    /**
     * 关闭浏览器实例
     */
    close(): Promise<void>;
    /**
     * 检查本地 Mermaid 库是否可用
     */
    isLocalMermaidAvailable(): boolean;
}
/**
 * 将 mermaid 字符串转换为图片 Buffer（向后兼容的函数）
 */
export declare function mermaidToImage(mermaidCode: string, options?: {
    timeout?: number;
    useCache?: boolean;
}): Promise<Buffer>;
/**
 * 清理 Mermaid 缓存
 */
export declare function clearMermaidCache(): void;
/**
 * 关闭 Mermaid 渲染器
 */
export declare function closeMermaidRenderer(): Promise<void>;
//# sourceMappingURL=mermaid-renderer-old.d.ts.map