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perf: remove Promise.all gate before scan-to-confirmation navigation - #99430

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Julesssss merged 3 commits into
Expensify:mainfrom
callstack-internal:perf/83503-scan-confirmation-defer-navigation
Sep 8, 2026
Merged

Julesssss merged 3 commits into
Expensify:mainfrom
callstack-internal:perf/83503-scan-confirmation-defer-navigation

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@OlimpiaZurek

@OlimpiaZurek OlimpiaZurek commented Aug 25, 2026 •

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Explanation of Change

PR removes the Promise.all gate in navigateGlobalCreate that awaited the participant Onyx merges before navigating to "Confirm details". The navigation does not depend on those merges, so awaiting them just held up the shutter-to-confirmation path (~12ms, measured locally).

Dropping the await on its own regressed the self-DM path (confirmation did not open on the first shutter tap; the flow returned to the scan step). Root cause: the navigation then ran synchronously inside the shutter's touch handler, so on release the touch resolved to the scan page's back button (IOURequestStartPage.navigateBack → closeRHPFlow()) instead of the shutter.

Fix: keep the writes fire-and-forget (perf gain stands) and queue the navigation on the microtask so it runs after the touch dispatch unwinds and the participants have propagated. Verified on Android across self-DM, workspace, multi-scan, and change-recipient flows.

Fixed Issues

$ #99672
PROPOSAL:

Tests

  1. On an account whose global-create scan resolves to the self-DM, open + → Create expense → Scan, scan a receipt, tap the shutter once.
  2. Confirm "Confirm details" opens on the first tap (To = "Your space").
  3. Repeat with an auto-reporting default workspace; confirm it opens normally.
  4. Multi-scan 2+ receipts; confirm each reaches Confirm.
  5. Change the recipient on Confirm, go back, re-scan; confirm it's preserved.
  • Verify that no errors appear in the JS console

Offline tests

QA Steps

Same as tests
// TODO: These must be filled out, or the issue title must include "[No QA]."

  • Verify that no errors appear in the JS console

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  • I linked the correct issue in the ### Fixed Issues section above
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Screenshots/Videos

Android: Native
Android: mWeb Chrome
iOS: Native
iOS: mWeb Safari
MacOS: Chrome / Safari

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Codecov Report

❌ Looks like you've decreased code coverage for some files. Please write tests to increase, or at least maintain, the existing level of code coverage. See our documentation here for how to interpret this table.

Files with missing lines Coverage Δ
src/libs/Navigation/deferNavigate.ts 0.00% <0.00%> (ø)
...tepScan/components/NavigateGlobalCreateContext.tsx 61.11% <0.00%> (-1.75%) ⬇️
... and 17 files with indirect coverage changes

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Codex Review: Didn't find any major issues. Breezy!

Reviewed commit: 3ff0c25f69

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@OlimpiaZurek
OlimpiaZurek marked this pull request as ready for review August 25, 2026 14:12
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@shubham1206agra Please copy/paste the Reviewer Checklist from here into a new comment on this PR and complete it. If you have the K2 extension, you can simply click: [this button]

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💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 3ff0c25f69

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Promise.all(setParticipantsPromises).then(() => {
setMoneyRequestParticipantsFromReport(tid, targetReport, currentUserPersonalDetails.accountID);
}
deferNavigate(() => {

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P1 Badge Wait for the queued participant merge before navigating

In the default-policy branch, setTransactionReport() and setMoneyRequestParticipantsFromReport() enqueue two Onyx merges against the same transaction key, so the participant merge may remain queued behind the report merge when this single microtask navigates. If confirmation mounts while participants is still empty, MoneyRequestInitializer treats the global-create draft as uninitialized and calls startMoneyRequest(), which clears/restarts the captured flow. The removed Promise.all prevented that race by waiting for the participant merges; navigation should remain gated on those merges or the fields should be written atomically.

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Both writes Onyx.merge the same transactionsDraft_<tid> key synchronously, and Onyx batches those into one delta, so the confirmation never sees reportID set with participants still empty and MoneyRequestInitializer won't restart the flow.

Verified on device (self-DM, workspace, multi-scan, change-recipient): confirmation mounts with participants.length === 1 and startMoneyRequest never runs.

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@OlimpiaZurek Can you find the original issue where this logic was added?

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@shubham1206agra It was added in #61176 (PR #61574) as part of the multi-scan IOU refactor.

It looks like the Promise.all was there to let the participant writes across the draft transactions finish before navigating, not for any navigation timing reason. Removing it and deferring the navigation to a microtask instead seems safe: the writes still fire first, and it's more performant

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No product review needed

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🚧 mountiny has triggered a test Expensify/App build. You can view the workflow run here.

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@shubham1206agra Could you take a look and review it when you have a chance? Thanks

@sosek108

sosek108 commented Sep 3, 2026

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Hi 👋
@OlimpiaZurek is OOO until end of the week. I'll help here while she is away

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Reviewer Checklist

  • I have verified the author checklist is complete (all boxes are checked off).
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    • I turned off my network connection and tested it while offline to ensure it matches the expected behavior (i.e. verify the default avatar icon is displayed if app is offline)
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Screenshots/Videos

Screen.Recording.2026-09-04.at.6.38.05.PM.mov

Comment on lines +58 to +60
function deferNavigate(fn: () => void) {
Promise.resolve().then(fn);
}

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@sosek108 NAB: Can we document this pattern somewhere so peeps starts preferring this over full Promise then chain?

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I added pulled deferNavigate into a shared util and added a short tip in NAVIGATION.md

cristipaval
cristipaval previously approved these changes Sep 4, 2026
@Julesssss
Julesssss merged commit daaad25 into Expensify:main Sep 8, 2026
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🚧 Julesssss has triggered a test Expensify/App build. You can view the workflow run here.

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✋ This PR was not deployed to staging yet because QA is ongoing. It will be automatically deployed to staging after the next production release.

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🚀 Deployed to staging by https://github.com/Julesssss in version: 9.4.74-0 🚀

platform result
🕸 web 🕸 success ✅
🤖 android 🤖 success ✅
🍎 iOS 🍎 success ✅

@MelvinBot

MelvinBot commented Sep 8, 2026 •

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No help site changes are required for this PR, so I did not create a docs PR.

This change is internal-only. It removes an await and defers the navigate to a microtask — the user-visible flow, screens, and labels are all identical.

Why no docs update is needed

What changed:

Why it doesn't touch docs/articles:

  • No new or renamed feature, no changed setting, tab, menu, or button label.
  • No change to the documented sequence of steps. Create-an-Expense.md is the article covering this flow, and its SmartScan steps (click the green Scan icon → capture the receipt → enter details) still describe the behavior exactly.
  • The multi-scan section of that same article is likewise unaffected.
  • The only user-perceivable difference is that "Confirm details" opens roughly 12ms sooner. The help site does not document navigation timing, so there is nothing to correct.

I searched docs/articles for SmartScan, scan, and confirmation-step content and found no article that describes the awaited-participant behavior this PR removed.

Since nothing in docs/articles needs editing, there were no feature names, tab names, or button labels to verify against the live UI, so I skipped that check as well.

@OlimpiaZurek, no help site PR was created because no article content is affected by this change. If you believe a customer-facing behavior did change here that I've missed, reply with the detail and I'll draft the docs PR.


view run · view recording

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🚀 Deployed to production by https://github.com/mountiny in version: 9.4.74-2 🚀

platform result
🕸 web 🕸 success ✅
🤖 android 🤖 success ✅
🍎 iOS 🍎 success ✅

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