fix(react): Patch spanEnd for potentially cancelled lazy-route transactions
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spanEnd for potentially cancelled lazy-route pageloadsspanEnd for potentially cancelled lazy-route transactions
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packages/react/src/reactrouter-compat-utils/instrumentation.tsx
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s1gr1d
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Oct 22, 2025
| * Patches the span.end() method to update the transaction name one last time before the span is sent. | ||
| * This handles cases where the span is cancelled early (e.g., document.hidden) before lazy routes have finished loading. | ||
| */ | ||
| function patchSpanEnd( |
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We have client.on("spanEnd"). Is it possible to use it here? Then it would be more transparent and aligned with the other implementations.
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I think that's not usable in this case, as we need to update the span name/source right before it ends. Looks like client.on('spanEnd') runs when the span is not mutable anymore.
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s1gr1d
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Fixes an issue where
pageloadandnavigationtransactions have incorrect (URL-based or wildcard-based) names when the span is cancelled early before lazy routes finish loading.This occurs when
document.hiddentriggers early span cancellation (e.g., user switches tabs during page load). In React Router applications with lazy routes, the parameterized route information may not be available yet when the span ends, resulting in transaction names like/user/123/edit(URL-based) or/projects/*/views/*(wildcard-based) instead of the correct parameterized route like/user/:id/editor/projects/:projectId/views/:viewId.This fix patches
span.end()to perform a final route resolution check before the span is sent, using the live globalallRoutesSet to capture any lazy routes that loaded after the span was created but before it ended.