import { Context, TextMapGetter, TextMapPropagator, TextMapSetter } from '@opentelemetry/api';
/**
 * Propagator for the B3 multiple-header HTTP format.
 * Based on: https://github.com/openzipkin/b3-propagation
 */
export declare class B3MultiPropagator implements TextMapPropagator {
    inject(context: Context, carrier: unknown, setter: TextMapSetter): void;
    extract(context: Context, carrier: unknown, getter: TextMapGetter): Context;
    fields(): string[];
}
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