import type { Context } from "@opentelemetry/api";
import type { TraceContextManager } from "./types.js";
export declare class TraceContextAPI implements TraceContextManager {
    #private;
    private static _instance?;
    private constructor();
    static getInstance(): TraceContextAPI;
    setGlobalManager(manager: TraceContextManager): boolean;
    disable(): void;
    reset(): void;
    getTraceContext(): Record<string, unknown>;
    getExternalTraceContext(): {
        traceId: string;
        spanId: string;
        traceFlags: number;
        tracestate?: string;
    } | undefined;
    extractContext(): Context;
    withExternalTrace<T>(fn: () => T): T;
}