import type { Middleware, MiddlewareContext } from '../middleware/types.js';
import type { HookContext, HookResult } from '../hooks/types.js';
export interface TimingReport {
    type: 'iteration' | 'tool';
    sessionId?: string;
    iteration?: number;
    toolName?: string;
    elapsedMs: number;
}
/**
 * 统计每轮迭代和每次工具调用的耗时
 * 可通过 onReport 回调获取汇总数据（如写入监控）
 */
export declare class TimingMiddleware implements Middleware {
    name: string;
    private iterStarts;
    private toolTimings;
    private onReport?;
    constructor(onReport?: (report: TimingReport) => void);
    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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