import type { Middleware, MiddlewareContext } from '../middleware/types.js';
import type { HookContext, HookResult } from '../hooks/types.js';
/**
 * 记录每轮迭代和工具调用的审计日志
 * - before/after: 记录迭代开始/结束 + 消息数量
 * - onToolBefore/onToolAfter: 记录工具调用名称、参数、耗时
 */
export declare class AuditLogMiddleware implements Middleware {
    name: string;
    private logger;
    /**
     * @param logger 自定义日志输出函数，默认写入文件 data/logs/audit-YYYY-MM-DD.log
     *               传入 'console' 字符串则输出到 console.log
     *               也可传入自定义函数
     */
    constructor(logger?: ((msg: string) => void) | 'console' | string);
    before(ctx: MiddlewareContext): Promise<void>;
    after(ctx: MiddlewareContext): Promise<void>;
    onToolBefore(ctx: HookContext): Promise<HookResult | void>;
    onToolAfter(ctx: HookContext): Promise<HookResult | void>;
}
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