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fix(core): route replay events in multiplexed transport #20408

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logaretm wants to merge 2 commits into from
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fix(core): route replay events in multiplexed transport #20408

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37b04cc
fix(core): route replay events in multiplexed transport
logaretm Apr 20, 2026
3bf438e
chore: bump CDN bundle size limits
logaretm Apr 20, 2026
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2 changes: 1 addition & 1 deletion packages/core/src/transports/multiplexed.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -102,7 +102,7 @@ export function makeMultiplexedTransport<TO extends BaseTransportOptions>(
const actualMatcher: Matcher =
matcher ||
(args => {
const event = args.getEvent();
const event = args.getEvent(['event', 'replay_event']);
if (
event?.extra?.[MULTIPLEXED_TRANSPORT_EXTRA_KEY] &&
Array.isArray(event.extra[MULTIPLEXED_TRANSPORT_EXTRA_KEY])
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31 changes: 31 additions & 0 deletions packages/core/test/lib/transports/multiplexed.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,7 @@ const TRANSACTION_ENVELOPE = createEnvelope<EventEnvelope>(
{ event_id: 'aa3ff046696b4bc6b609ce6d28fde9e2', sent_at: '123' },
[[{ type: 'transaction' }, TRANSACTION_EVENT] as EventItem],
);
const REPLAY_EVENT = { type: 'replay_event', event_id: 'aa3ff046696b4bc6b609ce6d28fde9e2' };

const DEFAULT_DISCARDED_EVENTS: ClientReport['discarded_events'] = [
{
Expand Down Expand Up @@ -320,4 +321,34 @@ describe('makeMultiplexedTransport() with default matcher', () => {
const transport = makeTransport({ url: DSN1_URL, ...transportOptions });
await transport.send(envelope);
});

it('sends replay events to targets provided in event.extra[MULTIPLEXED_TRANSPORT_EXTRA_KEY]', async () => {
expect.assertions(2);

const makeTransport = makeMultiplexedTransport(
createTestTransport(
url => {
expect(url).toBe(DSN1_URL);
},
url => {
expect(url).toBe(DSN2_URL);
},
),
);

const envelope = createEnvelope<EventEnvelope>({ event_id: 'aa3ff046696b4bc6b609ce6d28fde9e2', sent_at: '123' }, [
[
{ type: 'replay_event' },
{
...REPLAY_EVENT,
extra: {
[MULTIPLEXED_TRANSPORT_EXTRA_KEY]: [DSN1, DSN2],
},
},
] as EventItem,
]);
Comment on lines +339 to +349
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Copilot AI Apr 20, 2026

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This test creates a replay_event envelope item but asserts it as EventEnvelope / EventItem. Using the wrong envelope/item types in tests can hide real shape differences for replay envelopes. Consider typing the envelope/item as a generic Envelope/EnvelopeItem (or ReplayEnvelope if you include the full replay envelope structure) instead of asserting EventItem.

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const transport = makeTransport({ url: DSN1_URL, ...transportOptions });
await transport.send(envelope);
});
});
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