/**
 * Trace Timeline Viewer — Generate interactive HTML timelines from traces
 */
import type { AgentTrace } from './types';
export interface TimelineEvent {
    label: string;
    type: string;
    start_ms: number;
    duration_ms: number;
    cost_usd: number;
    detail?: string;
}
export interface TimelineSummary {
    events: TimelineEvent[];
    total_ms: number;
    total_cost: number;
    step_count: number;
}
/**
 * Parse a trace into timeline events with relative offsets.
 */
export declare function parseTimeline(trace: AgentTrace): TimelineSummary;
/**
 * Format timeline as ASCII for console output.
 */
export declare function formatTimelineAscii(summary: TimelineSummary): string;
/**
 * Generate an interactive HTML timeline page.
 */
export declare function generateTimelineHTML(trace: AgentTrace): string;
/**
 * Write timeline HTML to a file.
 */
export declare function writeTimelineHTML(trace: AgentTrace, outputPath: string): void;
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