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user_segment } = (scope && scope.getUser()) || {};\n\n const dsc = dropUndefinedKeys({\n environment: options.environment || DEFAULT_ENVIRONMENT,\n release: options.release,\n user_segment,\n public_key,\n trace_id,\n }) as DynamicSamplingContext;\n\n client.emit && client.emit('createDsc', dsc);\n\n return dsc;\n}\n\n/**\n * A Span with a frozen dynamic sampling context.\n */\ntype TransactionWithV7FrozenDsc = Transaction & { _frozenDynamicSamplingContext?: DynamicSamplingContext };\n\n/**\n * Creates a dynamic sampling context from a span (and client and scope)\n *\n * @param span the span from which a few values like the root span name and sample rate are extracted.\n *\n * @returns a dynamic sampling context\n */\nexport function getDynamicSamplingContextFromSpan(span: Span): Readonly<Partial<DynamicSamplingContext>> {\n const client = getClient();\n if (!client) {\n return {};\n }\n\n // passing emit=false here to only emit later once the DSC is actually populated\n const dsc = getDynamicSamplingContextFromClient(spanToJSON(span).trace_id || '', client, getCurrentScope());\n\n // TODO (v8): Remove v7FrozenDsc as a Transaction will no longer have _frozenDynamicSamplingContext\n const txn = getRootSpan(span) as TransactionWithV7FrozenDsc | undefined;\n if (!txn) {\n return dsc;\n }\n\n // TODO (v8): Remove v7FrozenDsc as a Transaction will no longer have _frozenDynamicSamplingContext\n // For now we need to avoid breaking users who directly created a txn with a DSC, where this field is still set.\n // @see Transaction class constructor\n const v7FrozenDsc = txn && txn._frozenDynamicSamplingContext;\n if (v7FrozenDsc) {\n return v7FrozenDsc;\n }\n\n // TODO (v8): Replace txn.metadata with txn.attributes[]\n // We can't do this yet because attributes aren't always set yet.\n // eslint-disable-next-line deprecation/deprecation\n const { sampleRate: maybeSampleRate, source } = txn.metadata;\n if (maybeSampleRate != null) {\n dsc.sample_rate = 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