test(e2e): Group collectStreamedSpans by trace - #23912
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It accumulated every span envelope into a single array, so a test asserting on one request's children could mix in spans from an earlier page load's trace, or have its wait satisfied by them. Spans are bucketed per trace now and the predicate sees one trace at a time, so it resolves with a coherent set. Every trace is evaluated as a candidate, so a leftover trace that never satisfies the predicate cannot hold up the one that does. Note this scopes a result to a single trace, it does not identify which trace: when several tests exercise the same route, the predicate still has to name something unique to the request under test. Also re-exports `SerializedStreamedSpan`, which specs need to type their span helpers. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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What
Groups the spans
collectStreamedSpansaccumulates by trace, so its predicate sees one trace at a time instead of a flat pile, and it resolves with only that trace's spans. Also re-exportsSerializedStreamedSpanso specs can type their span helpers.Why
Spans are buffered per trace and flushed on a timer, so a previous test's spans can still be arriving when the next one starts collecting. A test asserting on one request's children could therefore mix in an earlier page load's spans, or have its wait satisfied by them before its own spans arrived. Every trace is evaluated as a candidate, so a leftover trace that never satisfies the predicate cannot hold up the one that does.
Note this scopes a result to a single trace, it does not identify which trace: when several tests exercise the same route, the predicate still has to name something unique to the request under test.
Split out of the React Router porting stack because it is useful on its own, and other span streaming ports can drop their hand-rolled
trace_idfiltering once it lands.