Expo Router integration improvement: Prefetch route performance measurement with automatically created spans by alwx · Pull Request #5606 · getsentry/sentry-react-native

alwx · 2026-02-02T11:00:25Z

📢 Type of change

Bugfix
New feature
Enhancement
Refactoring

📜 Description

Fixes #5423
What happens here is we create spans automatically if enablePrefetchTracking is set to true for the reactNavigationIntegration OR if the ExpoRouter is wrapped with Sentry.wrapExpoRouter() — it's done this way because there are two ways of using prefetch with ExpoRouter.

💚 How did you test it?

CI, manually

📝 Checklist

I added tests to verify changes
No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled
I updated the docs if needed.
I updated the wizard if needed.
All tests passing
No breaking changes

🔮 Next steps

…automatically created spans

github-actions · 2026-02-02T11:00:45Z

Semver Impact of This PR

⚪ None (no version bump detected)

📋 Changelog Preview

This is how your changes will appear in the changelog.
Entries from this PR are highlighted with a left border (blockquote style).

Expo Router integration improvement: Prefetch route performance measurement with automatically created spans by alwx in #5606

chore(deps): update Bundler Plugins to v4.9.0 by github-actions in #5608
e2e tests on Cirrus Labs runners by alwx in #5485
chore(deps): bump getsentry/craft from 2.20.0 to 2.20.1 by dependabot in #5603
chore(deps): bump getsentry/craft/.github/workflows/changelog-preview.yml from 2.20.0 to 2.20.1 by dependabot in #5604
chore(deps): bump github/codeql-action from 4.31.11 to 4.32.0 by dependabot in #5605
Ref: Add Claude task by lucas-zimerman in #5602
chore(deps): update JavaScript SDK to v10.38.0 by github-actions in #5596

_{🤖 This preview updates automatically when you update the PR.}

github-actions · 2026-02-02T13:40:47Z

Android (legacy) Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	411.18 ms	432.30 ms	21.12 ms
Size	43.75 MiB	48.41 MiB	4.66 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
`f3b058c`+dirty	501.18 ms	536.70 ms	35.52 ms
`bfe454a`+dirty	573.44 ms	579.46 ms	6.02 ms
`294387d`+dirty	424.30 ms	465.40 ms	41.10 ms
`955f2eb`+dirty	422.74 ms	410.19 ms	-12.55 ms
`3bd3f0d`+dirty	447.21 ms	472.31 ms	25.10 ms
`d081295`+dirty	408.08 ms	453.62 ms	45.54 ms
`ad27f6e`+dirty	471.44 ms	516.23 ms	44.79 ms
`07808fb`+dirty	419.10 ms	419.08 ms	-0.02 ms
`170d5ea`+dirty	407.92 ms	422.49 ms	14.57 ms
`8e653ac`+dirty	360.28 ms	372.04 ms	11.76 ms

App size

Revision	Plain	With Sentry	Diff
`f3b058c`+dirty	43.75 MiB	48.07 MiB	4.32 MiB
`bfe454a`+dirty	17.75 MiB	19.69 MiB	1.94 MiB
`294387d`+dirty	43.75 MiB	48.04 MiB	4.29 MiB
`955f2eb`+dirty	17.75 MiB	19.70 MiB	1.95 MiB
`3bd3f0d`+dirty	17.75 MiB	19.70 MiB	1.95 MiB
`d081295`+dirty	43.75 MiB	48.04 MiB	4.29 MiB
`ad27f6e`+dirty	43.75 MiB	48.07 MiB	4.32 MiB
`07808fb`+dirty	17.75 MiB	19.70 MiB	1.95 MiB
`170d5ea`+dirty	17.75 MiB	19.70 MiB	1.95 MiB
`8e653ac`+dirty	17.75 MiB	19.75 MiB	2.00 MiB

github-actions · 2026-02-02T13:46:18Z

iOS (legacy) Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1214.91 ms	1219.30 ms	4.39 ms
Size	3.38 MiB	4.60 MiB	1.22 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
`6bd9054`+dirty	1212.20 ms	1217.89 ms	5.70 ms
`d73150f`+dirty	1198.44 ms	1210.06 ms	11.62 ms
`d081295`+dirty	1214.40 ms	1211.27 ms	-3.13 ms
`d1fd647`+dirty	1219.35 ms	1233.18 ms	13.83 ms
`ea3e26e`+dirty	1229.13 ms	1228.46 ms	-0.67 ms
`80e4616`+dirty	1221.32 ms	1225.64 ms	4.32 ms
`955f2eb`+dirty	1235.06 ms	1253.88 ms	18.81 ms
`5ee3314`+dirty	1215.18 ms	1207.64 ms	-7.54 ms
`70250df`+dirty	1214.51 ms	1215.04 ms	0.53 ms
`664c66f`+dirty	1215.37 ms	1221.30 ms	5.92 ms

App size

Revision	Plain	With Sentry	Diff
`6bd9054`+dirty	3.41 MiB	4.67 MiB	1.25 MiB
`d73150f`+dirty	3.38 MiB	4.60 MiB	1.22 MiB
`d081295`+dirty	3.41 MiB	4.59 MiB	1.18 MiB
`d1fd647`+dirty	2.63 MiB	3.99 MiB	1.36 MiB
`ea3e26e`+dirty	3.41 MiB	4.58 MiB	1.17 MiB
`80e4616`+dirty	3.38 MiB	4.60 MiB	1.22 MiB
`955f2eb`+dirty	2.63 MiB	3.98 MiB	1.35 MiB
`5ee3314`+dirty	2.63 MiB	3.99 MiB	1.35 MiB
`70250df`+dirty	3.44 MiB	4.59 MiB	1.15 MiB
`664c66f`+dirty	3.38 MiB	4.60 MiB	1.22 MiB

github-actions · 2026-02-02T14:01:30Z

Android (new) Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	399.10 ms	433.08 ms	33.98 ms
Size	43.94 MiB	49.27 MiB	5.33 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
`f3b058c`+dirty	422.90 ms	468.30 ms	45.40 ms
`294387d`+dirty	359.44 ms	393.40 ms	33.97 ms
`1d62dde`+dirty	366.59 ms	408.80 ms	42.21 ms
`d081295`+dirty	416.95 ms	461.24 ms	44.29 ms
`ad27f6e`+dirty	484.67 ms	532.79 ms	48.12 ms
`1226664`+dirty	377.65 ms	453.94 ms	76.29 ms
`083f560`+dirty	383.96 ms	417.76 ms	33.80 ms
`ec14be7`+dirty	401.58 ms	475.26 ms	73.68 ms
`eb07ba3`+dirty	419.49 ms	482.12 ms	62.63 ms
`d1fd647`+dirty	374.46 ms	409.51 ms	35.05 ms

App size

Revision	Plain	With Sentry	Diff
`f3b058c`+dirty	43.94 MiB	48.90 MiB	4.96 MiB
`294387d`+dirty	43.94 MiB	48.87 MiB	4.93 MiB
`1d62dde`+dirty	7.15 MiB	8.46 MiB	1.31 MiB
`d081295`+dirty	43.94 MiB	48.87 MiB	4.93 MiB
`ad27f6e`+dirty	43.94 MiB	48.90 MiB	4.96 MiB
`1226664`+dirty	7.15 MiB	8.46 MiB	1.30 MiB
`083f560`+dirty	7.15 MiB	8.43 MiB	1.28 MiB
`ec14be7`+dirty	7.15 MiB	8.42 MiB	1.26 MiB
`eb07ba3`+dirty	7.15 MiB	8.42 MiB	1.27 MiB
`d1fd647`+dirty	7.15 MiB	8.43 MiB	1.28 MiB

antonis · 2026-02-02T16:09:36Z

@sentry review

packages/core/test/tracing/expoRouter.test.ts

packages/core/src/js/tracing/expoRouter.ts

github-actions · 2026-02-02T16:26:59Z

iOS (new) Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1212.58 ms	1206.69 ms	-5.89 ms
Size	3.38 MiB	4.60 MiB	1.22 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
`6bd9054`+dirty	1207.02 ms	1199.27 ms	-7.76 ms
`d73150f`+dirty	1224.52 ms	1227.17 ms	2.65 ms
`d081295`+dirty	1205.24 ms	1207.52 ms	2.28 ms
`d1fd647`+dirty	1218.16 ms	1225.82 ms	7.65 ms
`ea3e26e`+dirty	1216.61 ms	1214.15 ms	-2.47 ms
`80e4616`+dirty	1206.90 ms	1205.94 ms	-0.96 ms
`955f2eb`+dirty	1225.78 ms	1239.27 ms	13.49 ms
`5ee3314`+dirty	1234.25 ms	1235.44 ms	1.19 ms
`70250df`+dirty	1211.96 ms	1222.31 ms	10.35 ms
`664c66f`+dirty	1195.94 ms	1194.80 ms	-1.14 ms

App size

Revision	Plain	With Sentry	Diff
`6bd9054`+dirty	3.41 MiB	4.67 MiB	1.25 MiB
`d73150f`+dirty	3.38 MiB	4.60 MiB	1.22 MiB
`d081295`+dirty	3.41 MiB	4.59 MiB	1.18 MiB
`d1fd647`+dirty	3.19 MiB	4.56 MiB	1.37 MiB
`ea3e26e`+dirty	3.41 MiB	4.58 MiB	1.17 MiB
`80e4616`+dirty	3.38 MiB	4.60 MiB	1.22 MiB
`955f2eb`+dirty	3.19 MiB	4.55 MiB	1.36 MiB
`5ee3314`+dirty	3.19 MiB	4.55 MiB	1.37 MiB
`70250df`+dirty	3.44 MiB	4.59 MiB	1.15 MiB
`664c66f`+dirty	3.38 MiB	4.60 MiB	1.22 MiB

packages/core/src/js/tracing/expoRouter.ts

alwx · 2026-02-03T11:11:07Z

StartSpanOptions doesn't actually have an origin attribute but SpanAttributes has sentry.origin which is what I added and also added those to tests.
@antonis it's ready for a second look.

packages/core/src/js/tracing/reactnavigation.ts

antonis · 2026-02-03T11:23:50Z

samples/expo/app/(tabs)/index.tsx

  const { currentlyRunning } = useUpdates();
+  const rawRouter = useRouter();
+  // Wrap the router to monitor prefetch performance
+  const router = Sentry.wrapExpoRouter(rawRouter);


I'm getting an error

✖ sentry-react-native-expo-sample:fix /Users/antonis/git/sentry-react-native/samples/expo/app/(tabs)/index.tsx 18:25 error 'wrapExpoRouter' not found in imported namespace 'Sentry' import/namespace ✖ 1 problem (1 error, 0 warnings)

lucas-zimerman

The PR is looking good! thank you.!
A minor note: should we also mention this on sentry docs?

antonis

LGTM 🚀
Let's wait for the tests to get 🟢 and merge

A minor note: should we also mention this on sentry docs?

Makes sense 👍

alwx · 2026-02-03T14:01:44Z

@antonis @lucas-zimerman will do the docs change later today, no worries

We've recently added a bunch of changes to Expo integrations in the React Native SDK, this PR adds the missing information about those changes to the docs. Here is the list of PRs it covers: - Expo Updates - getsentry/sentry-react-native#5794 - getsentry/sentry-react-native#5788 - getsentry/sentry-react-native#5748 - Expo Config Plugin - getsentry/sentry-react-native#5796 — 06d4e245 — Add environment option to Expo config plugin - EAS Build Integration - getsentry/sentry-react-native#5666 - getsentry/sentry-react-native#5773 - getsentry/sentry-react-native#5617 - Expo Router / Tracing - getsentry/sentry-react-native#5606 - getsentry/sentry-react-native#5718 - Tooling / Fixes - getsentry/sentry-react-native#5636 - getsentry/sentry-react-native#5733

Expo Router improvement: Prefetch route performance measurement with …

3bb6c56

…automatically created spans

alwx changed the title ~~WIP: Expo Router improvement: Prefetch route performance measurement with automatically created spans~~ WIP: Expo Router integration improvement: Prefetch route performance measurement with automatically created spans Feb 2, 2026

alwx added 3 commits February 2, 2026 13:59

Performance measurement for manual expo router prefetch() call

3aeecae

Changelog entry with the usage example

9999084

Fix

a2f6042

alwx changed the title ~~WIP: Expo Router integration improvement: Prefetch route performance measurement with automatically created spans~~ Expo Router integration improvement: Prefetch route performance measurement with automatically created spans Feb 2, 2026

alwx added the ready-to-merge Triggers the full CI test suite label Feb 2, 2026

alwx self-assigned this Feb 2, 2026

alwx marked this pull request as ready for review February 2, 2026 13:21

alwx requested review from antonis and lucas-zimerman as code owners February 2, 2026 13:21

Merge branch 'main' into alwx/feature/prefetch-tracking

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alwx added 3 commits February 3, 2026 12:00

sentry.origin added, tests adjusted

bb228b2

File renamed

8fd95b7

Test fixes

534c62c

Merge branch 'main' into alwx/feature/prefetch-tracking

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Lint fix

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alwx merged commit 42a723e into main Feb 3, 2026
98 of 99 checks passed

alwx deleted the alwx/feature/prefetch-tracking branch February 3, 2026 14:01

sentry-release-bot bot mentioned this pull request Feb 5, 2026

publish: getsentry/sentry-react-native@7.12.0 getsentry/publish#7071

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3 tasks

alwx mentioned this pull request Mar 13, 2026

Expo integration docs getsentry/sentry-docs#16923

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📢 Type of change

📜 Description

💚 How did you test it?

📝 Checklist

🔮 Next steps

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Android (legacy) Performance metrics 🚀

Baseline results on branch: main

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Baseline results on branch: main

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Android (new) Performance metrics 🚀

Baseline results on branch: main

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