import { ReadableSpan } from '@opentelemetry/sdk-trace-base';
/**
 * Get the parent span id from a span.
 * In OTel v1, the parent span id is accessed as `parentSpanId`
 * In OTel v2, the parent span id is accessed as `spanId` on the `parentSpanContext`
 */
export declare function getParentSpanId(span: ReadableSpan): string | undefined;
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