export interface HBSpan {
    traceId: string;
    spanId: string;
    parentSpanId: string;
    name: string;
    op: string;
    startTimeMs: number;
    durationMs: number;
    status: 'ok' | 'error' | 'cancelled';
    attributes?: Record<string, unknown>;
}
export interface TracingSessionContext {
    sessionId: string | null;
    endUserId: string | null;
    automaticProperties?: Record<string, unknown>;
    release?: string | null;
    environment?: string | null;
}
export interface TracingConfig {
    getSession: () => TracingSessionContext;
    sendSpans: (spans: HBSpan[], ctx: TracingSessionContext, useBeacon: boolean) => void;
    shouldSkipUrl?: (url: string) => boolean;
    pageLoadFlushDelayMs?: number;
}
export interface InactiveSpan {
    setAttribute(key: string, value: unknown): void;
    setStatus(status: 'ok' | 'error' | 'cancelled'): void;
    end(): void;
}
export declare class Tracing {
    private cfg;
    private traceId;
    private rootSpanId;
    private buffer;
    private flushTimer;
    private resourceObserver;
    private started;
    private originalFetch;
    constructor(cfg: TracingConfig);
    start(): void;
    /** Begin a fresh trace (e.g. an SPA route change). */
    startNewTrace(): void;
    /** W3C + Sentry trace-context headers for the current trace. */
    getTraceHeaders(): Record<string, string>;
    /** Time a synchronous or async callback as a child span. */
    startSpan<T>(opts: {
        name: string;
        op?: string;
        attributes?: Record<string, unknown>;
    }, callback: () => T): T;
    /** Open a span the caller ends manually. */
    startInactiveSpan(opts: {
        name: string;
        op?: string;
        attributes?: Record<string, unknown>;
    }): InactiveSpan;
    /** Flush buffered spans now. Called on unload (beacon) by the tracker. */
    flush(useBeacon?: boolean): void;
    stop(): void;
    private record;
    private capturePageLoad;
    private observeResources;
    private recordResource;
    private installTracePropagation;
}
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