/**
 * Trace Visualizer for AgentProbe v4.12.0
 *
 * Renders OTel spans as ASCII timeline, waterfall, and flame graph.
 */
import type { OTelSpan } from '../otel';
export declare class TraceVisualizer {
    /**
     * Render spans as a tree timeline:
     * ├─ test-1 ─────────────── 2.3s
     * │  ├─ tool:search ────── 1.1s
     * │  ├─ tool:calculate ─── 0.3s
     * │  └─ assertion ──────── 0.1s
     */
    renderTimeline(spans: OTelSpan[]): string;
    private renderTimelineNode;
    /**
     * Render spans as a waterfall chart (horizontal bars showing relative timing).
     */
    renderWaterfall(spans: OTelSpan[]): string;
    /**
     * Render spans as a flame graph (collapsed stack view).
     */
    renderFlameGraph(spans: OTelSpan[]): string;
}
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