BT-6886: fix: label unhandled promise rejections as 'Unhandled rejection'#370
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…promise rejections as 'Unhandled rejection' Adds 'Unhandled rejection' to BacktraceErrorType and uses it on the async error paths in browser, node, and react-native SDKs. Sync paths (window 'error' event, uncaughtException, RN ErrorBoundary, Android native) keep 'Unhandled exception'. Unhandled promise rejections and synchronous unhandled exceptions are distinct browser/node events with different crash semantics, but the JS SDKs were stamping both with error.type 'Unhandled exception'. The 'UnhandledPromiseRejection' classifier already captured the truth; the attribute now matches it. Customers can filter sync crashes from async noise without union queries. Verified end-to-end against a real Backtrace endpoint: async path submits with error.type 'Unhandled rejection', sync path still submits with 'Unhandled exception'.
GT1990
requested review from
adamcronin42,
konraddysput,
melekr and
sauce-abhisheks
melekr
approved these changes
May 14, 2026
…stener + Hermes path Addresses review feedback on PR #370: - node: new test exercises the dedicated process.prependListener('unhandledRejection', ...) path that runs under --unhandled-rejections=warn / Node 14. Was previously only covered via the shared uncaughtExceptionMonitor callback. - react-native: new test exercises the Hermes branch in captureUnhandledPromiseRejections by mocking hermes() to return a HermesInternal-shaped object with hasPromise and enablePromiseRejectionTracker. Was previously only covered via the non-Hermes rejectionTracking.enable path.
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Summary
Issue was customer was getting failed-fetch promise rejections labeled as unhandled exceptions. They created a support request to figure out if they were actually exceptions or if our sdk reclassifies them as an exception.
After some digging turns out their error was a UnhandledPromiseRejection and our sdk was reclassifying it as a unhandled exception.
task: BT-6886
what changed
'Unhandled rejection'toBacktraceErrorTypeunhandledrejectionin browser,unhandledRejectionin node, promise rejection tracker in react-native) now stamperror.type: 'Unhandled rejection'error,uncaughtException, error boundaries, android native) still stamperror.type: 'Unhandled exception'