import type { ProfilerClock } from "./clock";
export declare class AsyncActivityTracker {
    private readonly _clock;
    private readonly _currentSpanId;
    private readonly _resourceSpans;
    private readonly _activeSegments;
    private readonly _activeMs;
    private readonly _activeSpans;
    private readonly _hook;
    private _enabled;
    constructor(_clock: ProfilerClock, _currentSpanId: () => string | undefined, onError: (error: unknown) => void);
    startSpan(spanId: string): void;
    measureSynchronous<T>(spanId: string | undefined, action: () => T): T;
    finishSpan(spanId: string): number;
    disable(): void;
    private _finishSegment;
    private _deleteResource;
    private _add;
}