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ref(core): Avoid side-effect of vercelAiEventProcessor #16925

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merged 1 commit into from
Jul 14, 2025
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ref(core): Avoid side-effect of vercelAiEventProcessor #16925

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22 changes: 9 additions & 13 deletions packages/core/src/utils/vercel-ai.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -57,19 +57,15 @@ function onVercelAiSpanStart(span: Span): void {
processGenerateSpan(span, name, attributes);
}

const vercelAiEventProcessor = Object.assign(
(event: Event): Event => {
if (event.type === 'transaction' && event.spans) {
for (const span of event.spans) {
// this mutates spans in-place
processEndedVercelAiSpan(span);
}
function vercelAiEventProcessor(event: Event): Event {
if (event.type === 'transaction' && event.spans) {
for (const span of event.spans) {
// this mutates spans in-place
processEndedVercelAiSpan(span);
}
return event;
},
{ id: 'VercelAiEventProcessor' },
);

}
return event;
}
/**
* Post-process spans emitted by the Vercel AI SDK.
*/
Expand Down Expand Up @@ -229,5 +225,5 @@ function processGenerateSpan(span: Span, name: string, attributes: SpanAttribute
export function addVercelAiProcessors(client: Client): void {
client.on('spanStart', onVercelAiSpanStart);
// Note: We cannot do this on `spanEnd`, because the span cannot be mutated anymore at this point
client.addEventProcessor(vercelAiEventProcessor);
client.addEventProcessor(Object.assign(vercelAiEventProcessor, { id: 'VercelAiEventProcessor' }));
}
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