/**
 * W3C `traceparent` encoding for span contexts that must survive a process.
 *
 * A span context lives only as long as the process holding it. Work that
 * suspends and resumes later -- a workflow parked on an approval -- has to
 * write its trace identity somewhere durable and read it back into a link.
 * That wire format is `traceparent`, and this module is the only place that
 * knows it.
 *
 * @module observability/tracing/traceparent
 */
import type { SpanContext } from "./api-shim.js";
/**
 * Encode a span context as a `traceparent` header value.
 *
 * Returns undefined for the placeholder context a no-op tracer hands back, so
 * callers never persist an identity that can never be linked to.
 */
export declare function formatTraceparent(spanContext: SpanContext | undefined): string | undefined;
/**
 * Decode a `traceparent` header value into a span context.
 *
 * Version `ff` is forbidden by the spec, and a future version's extra fields
 * are ignored rather than rejected, so a record written by a newer writer
 * still links.
 */
export declare function parseTraceparent(traceparent: string | undefined): SpanContext | undefined;
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