import { Context, TextMapGetter, TextMapPropagator, TextMapSetter } from '@opentelemetry/api';
export declare class W3CMutableBaggagePropagator implements TextMapPropagator {
    inject(context: Context, carrier: unknown, setter: TextMapSetter): void;
    extract(context: Context, carrier: unknown, getter: TextMapGetter): Context;
    fields(): string[];
}
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