/** 追踪上下文 */
export interface TraceContext {
    traceId: string;
    spanId: string;
    parentSpanId?: string;
    startTime: number;
    attributes: Record<string, unknown>;
}
/** 追踪事件 */
export interface TraceEvent {
    name: string;
    timestamp: number;
    attributes?: Record<string, unknown>;
}
/** 追踪 Span */
export interface TraceSpan {
    context: TraceContext;
    endTime?: number;
    status: 'active' | 'ok' | 'error';
    events: TraceEvent[];
}
/** Tracer 接口 */
export interface Tracer {
    startSpan(name: string, parent?: TraceContext): TraceSpan;
    endSpan(span: TraceSpan): void;
    addEvent(span: TraceSpan, name: string, attributes?: Record<string, unknown>): void;
}
/**
 * InMemoryTracer — 内存链路追踪实现
 * 生成唯一 traceId / spanId，支持父子 span 关联
 */
export declare class InMemoryTracer implements Tracer {
    private spans;
    /** 当前活跃的 traceId（用于跨 span 关联） */
    private currentTraceId?;
    startSpan(name: string, parent?: TraceContext): TraceSpan;
    endSpan(span: TraceSpan): void;
    addEvent(span: TraceSpan, name: string, attributes?: Record<string, unknown>): void;
    /** 获取所有已记录的 span */
    getSpans(): TraceSpan[];
    /** 清空所有记录 */
    clear(): void;
    private generateId;
}
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