fix(browser): address review findings in the browser SDK and session replay - #1168
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…replay Offline queue - With requireConsent, batches from an earlier page were deleted on the next load: consent is re-granted every load, so every batch predated it. Batches are now dropped only if consent was withdrawn after they were stored (a revoke is persisted to localStorage, so it holds across tabs). - indexedDB.open throwing synchronously (sandboxed iframes, data: pages) no longer kills the deferred chunk. - shutdown() flushes tracing and logs before closing the queue, and the queue closes only after in-flight writes, so a final failed batch is kept. Errors - A fetch that never got a response (offline, DNS, CORS) is now an error span with error.type set to what failed; aborts are not. Network-failure spans get the same "METHOD url -> type" error.message as status errors. - captureException and the global handlers only use Maple's own provider, never a host app's global one, and skip work while consent is withheld. An error recorded without consent is no longer marked reported, so it is still captured after a re-grant. - traced() applies the error filters, as the global handlers do. - Building the Caused-by chain can no longer throw (null-prototype or throwing toString causes, engines without AggregateError). Signals - Consecutive input breadcrumbs on one field collapse into one, so typing no longer evicts the clicks and navigations before an error. - Slow interactions are no longer all dropped where interactionId is missing; jank spans are parented to the navigation only if it had already started. - CSP violations are also read from the DOM event, deduped with ReportingObserver, since not every observer delivers them. - XHR response headers are read once from getAllResponseHeaders(), so an unexposed cross-origin header no longer logs a console error per request. - x-api-key joins the headers that are never recorded. - React Router: a same-path loading state (search change, revalidation) no longer starts a navigation span. Session replay - Network bodies: patterns match the full URL; text/event-stream is never read; body reads give up after 5s; request bodies are kept only with maskAllInputs off, since a form POST carries what was typed. - Buffer mode takes its 30s checkout snapshot only while the page is visible and has changed, instead of on a fixed timer. - An unknown replayTrigger no longer invalidates the whole session record, and a session minted by idle rotation keeps the page's buffer decision. Docs updated for each behaviour change and for the router and XHR propagation mismatches.
Maple review🟡 Confidence 3/5 · needs attention A sweep of review fixes across the browser SDK and session replay: consent-aware offline queue, network failures becoming issues, errors scoped to Maple's own tracer, breadcrumb/checkout/header/perf corrections, each with a regression test. The rest is safe to merge; the perf guard is the one to look at.
Findings🟠 Warning · F1 ·
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Included review availability: This review used your included allowance. Your plan provides up to 4 included reviews per hour; 1 remain after this review. 📝 WalkthroughWalkthroughThis pull request updates session replay capture and session adoption, browser tracing and error reporting, navigation and performance spans, offline queue consent handling, and shutdown ordering. It also updates SDK documentation and adds tests for these behaviors. ChangesSession replay capture and session state
Browser tracing and event instrumentation
Offline queue and shutdown
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Bug fix Merge Risk: ⚪ Minimal · up to The changes improve slow-interaction reporting and consent-aware offline delivery. No concrete merge-blocking issue remains in the supplied evidence; merge after normal checks pass. Architecture SummaryArchitecture risk: 🟠 High · up to The change affects 4 systems. Changed systems: Architecture concerns Review detailsSystems and components
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Inline comments:
Review comments at @packages/browser/src/deferred/offline.ts:
- Around line 106-109: Update stash to capture createdAt when called and reuse
that timestamp for the queued batch; serialize consent withdrawal by chaining
clear() onto writes so pending adds cannot persist after clearing. Move writes
and stash above onConsentChange so the handler can use them.
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📒 Files selected for processing (33)
apps/landing/src/content/docs/session-replay/browser-sdk.mddocs/browser-sdk.mdpackages/browser-session/src/platform/transport.tspackages/browser-session/src/replay/capture/network.browser.test.tspackages/browser-session/src/replay/capture/network.tspackages/browser-session/src/replay/events.tspackages/browser-session/src/replay/record.test.tspackages/browser-session/src/replay/record.tspackages/browser-session/src/session/lifecycle.tspackages/browser-session/src/session/replay-session.tspackages/browser-session/src/session/session.test.tspackages/browser-session/src/session/session.tspackages/browser/README.mdpackages/browser/src/breadcrumbs.browser.test.tspackages/browser/src/deferred/breadcrumbs.tspackages/browser/src/deferred/index.tspackages/browser/src/deferred/offline.browser.test.tspackages/browser/src/deferred/offline.tspackages/browser/src/deferred/perf.tspackages/browser/src/deferred/reports.tspackages/browser/src/error-causes.test.tspackages/browser/src/error-causes.tspackages/browser/src/errors.browser.test.tspackages/browser/src/errors.tspackages/browser/src/http-headers.tspackages/browser/src/http-status.test.tspackages/browser/src/http-status.tspackages/browser/src/init.tspackages/browser/src/navigation.tspackages/browser/src/react.browser.test.tspackages/browser/src/react.tspackages/browser/src/tracing.browser.test.tspackages/browser/src/tracing.ts
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- Consent: the revoke is now recorded by the consent module on an explicit setConsent(false) after a grant, so it holds even where the offline queue never ran (revoked before the deferred chunk loaded, or after shutdown). A page starting without consent is not a revoke. - A fetch aborted with a custom reason (controller.abort(reason)) is no longer marked as a network failure: the request's signal decides. - traced() runs beforeCapture once for a failure in an unsampled session. - Input breadcrumbs merge only when both have a target selector. - Buffered replay still checks out while hidden when the buffer is empty or the current segment nears the size cap, and a takeFullSnapshot throw can no longer escape the timer. - Docs: request bodies need maskAllInputs off (options table), only string request bodies are kept, and the README says to attach router adapters after init().
Maple review🟡 Confidence 3/5 · needs attention Second review-fix pass over the browser SDK and session replay: consent-aware offline dropping, Error status for rejected fetches, error-filter plumbing through
Still open from earlier reviews
What was checked
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Bodies are read in the background, so the order events land in is not the order the requests were made; the test picked them by index and flaked.
Maple review🟢 Confidence 4/5 · likely safe to merge Since the last pass only
Still open from earlier reviews
What was checked
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- Slow interactions: only interactionId 0 means "not an interaction". An engine without interactionId no longer loses every slow-interaction span; its events are keyed by name and start time instead. - Offline queue: a batch is stamped when it is stashed and skipped if consent was withdrawn before its write ran, and a revoke's clear is queued behind pending writes, so nothing lands after the clear. - Offline resend re-checks consent before every POST, so a revoke during a multi-batch resend stops the rest.
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Note Maple is reviewing this pull request at |
… effect-sdk 0.9.1 (#1184) * fix(browser): HTTP client spans follow the semconv status rules by default The HTTP semantic conventions say a client span with a 4xx or 5xx response SHOULD be Error, with error.type set to the status code and no status description. The fetch and XHR instrumentations already do that at 0.222, but the SDK's status policy cleared it unless the app listed the status in errors.captureHttpStatus, and added an error.message the registry marks deprecated. - errors.captureHttpStatus defaults to [[400, 599]]; narrowing it clears the Error for the statuses left out. - No error.message on status or network-failure errors; error.type alone classifies them (httpStatusError becomes httpErrorType). - The customer browser SDK page gets the stack's sections, which never reached main: the docs PR was merged into its base branch after that branch had already landed. Three-way merged with #1168's edits. * chore(release): browser 0.10.1, effect-sdk 0.9.1 Patch releases. browser 0.10.0 was published from outside the repo, so the browser package goes from 0.9.0 in the tree to 0.10.1 to stay above npm. * fix(browser): count fetch timeouts as errors, scope the sampling guarantee - AbortSignal.timeout() aborts the signal and rejects with a TimeoutError, so the abort check skipped it. A timeout now marks the span Error with error.type TimeoutError; aborting with the app's own controller still does not. - The docs promised every error span is sent whatever tracing.sampleRate is; only errors reported as their own spans are. Failed request spans follow the session's sampling.
Fixes from a read-only review of the browser SDK stack (#1145 through #1158), which is on
main.What changed
Offline queue (
transport.offline)privacy.requireConsent, every batch left from an earlier page was deleted instead of sent. Consent is granted again on each load, so every stored batch looked older than the grant.indexedDB.openfailure (sandboxed iframes,data:pages) no longer stops the whole deferred chunk and leaks its listeners.shutdown()now flushes tracing and logs before the queue closes. The queue closes only after in-flight writes finish, so the last failed batch is kept.Errors
fetchthat never got a response (offline, DNS, CORS) ended with no error status and never became an issue. The docs promised it would.Erroranderror.type(TypeError), and an aborted request is not an error. Network-failure spans get the sameMETHOD url -> typeerror.messageascaptureHttpStatuserrors. XHR already markederror/timeout.captureExceptionand the global handlers now use only Maple's own tracer provider. Beforeinit(), the global one can belong to the host app, and error spans were landing in its pipeline.traced()now applies the error filters, like the global handlers do.Caused by:chain can no longer throw inside the error handler.Signals
interactionId. Now they keep reporting.ReportingObserver.getAllResponseHeaders(), so a header the server doesn't expose to the page no longer logs a console error on every request.x-api-keyis added to the headers that are never recorded.Session replay (
@maple/browser-session)text/event-streamresponses are never read, and body reads give up after 5s, so an app's stream connection is no longer held open.maskAllInputs: false, since a form POST contains what was typed.replayTriggerwritten by a newer SDK no longer invalidates the whole session record.Docs:
docs/browser-sdk.md, the landing page and the README are updated for each behaviour change. Also fixed: they said the SDK tracks no router events, that trace propagation is fetch-only, and that all error spans are always exported.Reviewer notes
maskAllInputs: false;x-api-keyis never recorded;init(), now documented.@maple-dev/browser: 146 tests pass.@maple/browser-session: 232 tests pass.@maple-dev/effect-sdkclient (which bundlesbrowser-session): 37 tests pass.🤖 Generated with Claude Code
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Bug Fixes
Improvements
Documentation