/**
 * Class extended from OpenTelemetry B3MultiPropagator so that we can:
 * 1. Propagate & log the X-B3-Info header
 * 2. Propagate the correct X-B3-ParentSpanId
 *
 * See {@link https://github.com/open-telemetry/opentelemetry-js/blob/main/packages/opentelemetry-propagator-b3/src/B3MultiPropagator.ts}
 */
import { Context, TextMapGetter, TextMapPropagator, TextMapSetter } from '@opentelemetry/api';
export declare const X_B3_TRACE_ID = "x-b3-traceid";
export declare const X_B3_SPAN_ID = "x-b3-spanid";
export declare const X_B3_SAMPLED = "x-b3-sampled";
export declare const X_B3_PARENT_SPAN_ID = "x-b3-parentspanid";
export declare const X_B3_FLAGS = "x-b3-flags";
export declare const X_B3_INFO = "x-b3-info";
export declare const B3_DEBUG_FLAG_KEY: symbol;
export declare const B3_INFO_KEY: symbol;
export declare const B3_TRACE_ID_LENGTH_KEY: symbol;
export declare const B3_PARENT_SPAN_ID_KEY: symbol;
export declare class UoaB3Propagator implements TextMapPropagator {
    inject(context: Context, carrier: any, setter: TextMapSetter<any>): void;
    extract(context: Context, carrier: any, getter: TextMapGetter<any>): Context;
    fields(): string[];
}