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perf: defer styles computation from module import to provider render#87617

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elirangoshen wants to merge 4 commits intoExpensify:mainfrom
callstack-internal:eliran-sentry-remove-styles-hook
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perf: defer styles computation from module import to provider render#87617
elirangoshen wants to merge 4 commits intoExpensify:mainfrom
callstack-internal:eliran-sentry-remove-styles-hook

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@elirangoshen elirangoshen commented Apr 10, 2026

Remove eagerly-computed defaultStyles and DefaultStyleUtils that ran the entire 6500-line styles() function at module import time. The context defaults are never used at runtime since useThemeStyles() and useStyleUtils() both throw on null context. This defers styles computation to ThemeStylesProvider render, improving web startup by ~336ms (9.6%).

Explanation of Change

Fixed Issues

$
PROPOSAL:

Tests

  • Verify that no errors appear in the JS console

Offline tests

QA Steps

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

  • Verify that no errors appear in the JS console

PR Author Checklist

  • I linked the correct issue in the ### Fixed Issues section above
  • I wrote clear testing steps that cover the changes made in this PR
    • I added steps for local testing in the Tests section
    • I added steps for the expected offline behavior in the Offline steps section
    • I added steps for Staging and/or Production testing in the QA steps section
    • I added steps to cover failure scenarios (i.e. verify an input displays the correct error message if the entered data is not correct)
    • 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)
    • I tested this PR with a High Traffic account against the staging or production API to ensure there are no regressions (e.g. long loading states that impact usability).
  • I included screenshots or videos for tests on all platforms
  • I ran the tests on all platforms & verified they passed on:
    • Android: Native
    • Android: mWeb Chrome
    • iOS: Native
    • iOS: mWeb Safari
    • MacOS: Chrome / Safari
  • I verified there are no console errors (if there's a console error not related to the PR, report it or open an issue for it to be fixed)
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    • I verified any copy / text shown in the product is localized by adding it to src/languages/* files and using the translation method
      • If any non-english text was added/modified, I used JaimeGPT to get English > Spanish translation. I then posted it in #expensify-open-source and it was approved by an internal Expensify engineer. Link to Slack message:
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  • If a new code pattern is added I verified it was agreed to be used by multiple Expensify engineers
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  • I verified any variables that can be defined as constants (ie. in CONST.ts or at the top of the file that uses the constant) are defined as such
  • I verified that if a function's arguments changed that all usages have also been updated correctly
  • If any new file was added I verified that:
    • The file has a description of what it does and/or why is needed at the top of the file if the code is not self explanatory
  • If a new CSS style is added I verified that:
    • A similar style doesn't already exist
    • The style can't be created with an existing StyleUtils function (i.e. StyleUtils.getBackgroundAndBorderStyle(theme.componentBG))
  • If new assets were added or existing ones were modified, I verified that:
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    • The assets load correctly across all supported platforms.
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Screenshots/Videos

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

@elirangoshen @claude
perf: defer styles computation from module import to provider render
dede283 
Remove eagerly-computed defaultStyles and DefaultStyleUtils that ran
the entire 6500-line styles() function at module import time. The
context defaults are never used at runtime since useThemeStyles() and
useStyleUtils() both throw on null context. This defers styles
computation to ThemeStylesProvider render, improving web startup by
~336ms (9.6%).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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melvin-bot Bot commented Apr 10, 2026

Hey! I see that you made changes to our Form component. Make sure to update the docs in FORMS.md accordingly. Cheers!

elirangoshen and others added 2 commits April 10, 2026 14:23
@elirangoshen @claude
fix: remove eslint-disable comments from story files
35e8347 
Use @src/styles and @src/styles/theme paths instead of restricted
@styles/index and @styles/theme paths, eliminating all eslint-disable
comments.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
@elirangoshen @claude
fix: use lazy Proxy for theme styles context defaults
c34632d 
Tests render components without ThemeStylesProvider, so the context
defaults must be real values. Use a Proxy with lazy initialization to
defer the expensive styles(defaultTheme) call to first property access,
preserving the startup perf gain while keeping tests working.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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codecov Bot commented Apr 10, 2026 •
edited by github-actions Bot
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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
...c/components/ThemeStylesContextProvider/default.ts 100.00% <100.00%> (ø)
src/styles/index.ts 47.93% <ø> (-0.82%) ⬇️
src/styles/utils/index.ts 48.60% <ø> (+0.18%) ⬆️
src/stories/CheckboxWithLabel.stories.tsx 0.00% <0.00%> (ø)
src/stories/Composer.stories.tsx 0.00% <0.00%> (ø)
src/stories/DragAndDrop.stories.tsx 0.00% <0.00%> (ø)
src/stories/Form.stories.tsx 0.00% <0.00%> (ø)
src/stories/NumberWithSymbolForm.stories.tsx 0.00% <0.00%> (ø)
... and 187 files with indirect coverage changes

@elirangoshen @claude
fix: remove eslint-disable comments from default.ts
f7b0335 
Use @src/styles paths instead of restricted @Styles paths.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
@BartekObudzinski
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BartekObudzinski commented Apr 16, 2026

@codex review

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BartekObudzinski commented Apr 16, 2026

@codex review

@BartekObudzinski BartekObudzinski mentioned this pull request Apr 16, 2026
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Codex Review: Something went wrong. Try again later by commenting “@codex review”.

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BartekObudzinski commented Apr 17, 2026

Can be closed it's already merged #88097

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