test(e2e): Port React E2E test apps to span streaming - #23849
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andreiborza merged 2 commits intoSep 2, 2026
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Removes the `traceLifecycle: 'static'` pin from `create-react-app`, `lighthouse-react`, `react-17`, `react-19` and `react-send-to-sentry`, and rewrites the `react-17` specs against streamed span v2. `react-send-to-sentry` needed more than a helper swap. Pageload and navigation segments never become transaction events under streaming, so the app records them from `beforeSendSpan` instead of the event processor, and the trace lookup matches a span id rather than a transaction event id. `react-19` keeps its specs unchanged: they only cover error handling and the profiler, neither of which depends on the trace lifecycle.
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Matching `event_id` against the recorded span id never resolved, so both span lookups polled for the full three minutes. The trace is already unique to the pageload or navigation under test, so the op identifies the segment within it without depending on which field carries the span id. Log the trace's item shapes once when the op is missing, so a repeat failure is diagnosable.
andreiborza
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September 2, 2026 11:20
s1gr1d
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Sep 2, 2026
Lms24
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I'm curious if this will introduce new flakes, given that there's also no guarantee on the backend that all spans of a trace arrive at once. But probably fine to leave as-is for now and revisit when it comes to flakes.
If it flakes, we likely can't stop polling on the first success response from the API but rather again continue with the requests until a condition is met.
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What
Ports
create-react-app,lighthouse-react,react-17,react-19andreact-send-to-sentryto span streaming.Why
Span streaming is the default now, so the E2E suite has to exercise it.
react-send-to-sentryneeded more than a helper swap: pageload and navigation segments never become transaction events under streaming, so the app records them frombeforeSendSpanand the trace lookup matches a span id rather than a transaction event id. That lookup runs against real Sentry, so CI is what confirms the shape.react-19keeps its specs unchanged, since they only cover error handling and the profiler.Closes: #23799