Switch to using yarn v4 by acoates-ms · Pull Request #15925 · microsoft/react-native-windows

acoates-ms · 2026-04-03T04:41:38Z

Description

Currently we are using midgard-yarn which is a custom fork of yarnv1 to improve perfomance. Most of the performance improvements in this fork were adopted by yarn 4. So we can move of the more custom midgard-yarn, on to a more broadly supported version of yarn.

iamAbhi-916

LGTM

github-actions · 2026-04-06T17:45:03Z

Performance Test Results

Branch: yarn4
Commit: b5ceca8b
Time: 2026-04-06T22:59:16.590Z
Tests: 160/161 passed

❌ Regressions Detected

FlatList

Scenario	Baseline	Current	Change	Status
FlatList rerender	9.50ms	13.10ms	+44.4%	❌

FlatList rerender: Duration increased by 44.4% / +4.00ms (threshold: 10% & 3ms)

✅ Passed

147 scenario(s) across 27 suite(s) — no regressions

SectionList

Scenario	Mean	Median	StdDev	Renders	vs Baseline
SectionList mount	5.00ms	4.50ms	±1.83ms	1	-10.0%
SectionList unmount	0.20ms	0.00ms	±0.42ms	0	+0.0%
SectionList rerender	13.30ms	13.00ms	±2.83ms	2	+23.8%
SectionList with-3-sections-15-items	7.70ms	7.50ms	±2.21ms	1	+36.4%
SectionList with-5-sections-50-items	7.40ms	6.50ms	±2.22ms	1	+8.3%
SectionList with-10-sections-200-items	5.30ms	5.00ms	±0.82ms	1	-9.1%
SectionList with-20-sections-200-items	4.90ms	5.00ms	±1.73ms	1	+0.0%
SectionList with-section-separator	1.90ms	2.00ms	±0.32ms	1	+0.0%
SectionList with-item-separator	4.10ms	4.00ms	±1.52ms	1	+100.0%
SectionList with-header-footer	1.70ms	1.50ms	±0.82ms	1	-25.0%
SectionList with-section-footer	2.90ms	2.00ms	±2.18ms	1	+0.0%
SectionList with-sticky-section-headers	2.20ms	2.00ms	±1.03ms	1	+0.0%
SectionList with-empty-list	0.60ms	1.00ms	±0.52ms	1	+0.0%
SectionList with-50-sections-1000-items	3.10ms	2.00ms	±2.85ms	1	+0.0%

TouchableOpacity

Scenario	Mean	Median	StdDev	Renders	vs Baseline
TouchableOpacity mount	0.80ms	1.00ms	±0.42ms	1	+0.0%
TouchableOpacity unmount	0.60ms	0.00ms	±1.58ms	0	+0.0%
TouchableOpacity rerender	1.10ms	1.00ms	±0.57ms	2	+0.0%
TouchableOpacity custom-active-opacity	0.90ms	1.00ms	±0.32ms	1	+0.0%
TouchableOpacity disabled	0.60ms	1.00ms	±0.52ms	1	+0.0%
TouchableOpacity with-all-handlers	0.70ms	1.00ms	±0.48ms	1	+0.0%
TouchableOpacity with-hit-slop	1.00ms	1.00ms	±0.00ms	1	+0.0%
TouchableOpacity with-delay	1.20ms	1.00ms	±0.63ms	1	+0.0%
TouchableOpacity nested	1.80ms	2.00ms	±0.92ms	1	+100.0%
TouchableOpacity multiple-10	6.73ms	6.00ms	±1.83ms	1	+0.0%
TouchableOpacity multiple-50	29.73ms	28.00ms	±4.30ms	1	-3.4%
TouchableOpacity multiple-100	44.67ms	49.00ms	±12.08ms	1	-2.0%

ScrollView

Scenario	Mean	Median	StdDev	Renders	vs Baseline
ScrollView mount	0.30ms	0.00ms	±0.48ms	1	+0.0%
ScrollView unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
ScrollView rerender	0.70ms	1.00ms	±0.48ms	2	+0.0%
ScrollView children-20	3.73ms	4.00ms	±0.88ms	1	+0.0%
ScrollView children-100	18.27ms	18.00ms	±4.20ms	1	+12.5%
ScrollView horizontal	3.80ms	3.50ms	±1.40ms	1	-12.5%
ScrollView sticky-headers	2.90ms	3.00ms	±0.88ms	1	+0.0%
ScrollView scroll-indicators	0.70ms	1.00ms	±0.48ms	1	+0.0%
ScrollView nested	1.70ms	1.00ms	±1.06ms	1	+0.0%
ScrollView content-container-style	1.10ms	1.00ms	±0.57ms	1	+0.0%
ScrollView children-500	21.07ms	19.00ms	±3.99ms	1	+0.0%

TouchableHighlight

Scenario	Mean	Median	StdDev	Renders	vs Baseline
TouchableHighlight mount	0.40ms	0.00ms	±0.52ms	1	-100.0%
TouchableHighlight unmount	0.10ms	0.00ms	±0.32ms	0	+0.0%
TouchableHighlight rerender	0.50ms	0.50ms	±0.53ms	2	-50.0%
TouchableHighlight custom-underlay-color	0.50ms	0.50ms	±0.53ms	1	+Infinity%
TouchableHighlight custom-active-opacity	0.30ms	0.00ms	±0.48ms	1	+0.0%
TouchableHighlight disabled	0.50ms	0.50ms	±0.53ms	1	+Infinity%
TouchableHighlight with-all-handlers	0.30ms	0.00ms	±0.48ms	1	+0.0%
TouchableHighlight with-hit-slop	0.30ms	0.00ms	±0.48ms	1	+0.0%
TouchableHighlight nested-touchables	0.80ms	1.00ms	±0.42ms	1	+0.0%
TouchableHighlight multiple-touchables-10	3.40ms	3.00ms	±1.07ms	1	+0.0%
TouchableHighlight multiple-touchables-50	16.30ms	16.50ms	±2.98ms	1	+32.0%
TouchableHighlight multiple-touchables-100	27.50ms	28.50ms	±4.40ms	1	+26.7%

Pressable

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Pressable mount	0.50ms	0.50ms	±0.53ms	1	+Infinity%
Pressable unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
Pressable rerender	0.70ms	1.00ms	±0.48ms	2	+100.0%
Pressable with-all-handlers	0.50ms	0.50ms	±0.53ms	1	+Infinity%
Pressable with-style-function	0.30ms	0.00ms	±0.48ms	1	+0.0%
Pressable disabled	0.40ms	0.00ms	±0.52ms	1	+0.0%
Pressable with-hit-slop	0.20ms	0.00ms	±0.42ms	1	+0.0%
Pressable nested	0.70ms	1.00ms	±0.48ms	1	+0.0%
Pressable multiple-10	3.07ms	3.00ms	±0.46ms	1	+0.0%
Pressable multiple-50	18.80ms	19.00ms	±3.14ms	1	+35.7%
Pressable multiple-100	18.67ms	14.00ms	±11.57ms	1	+16.7%

Modal

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Modal mount	0.20ms	0.00ms	±0.42ms	1	+0.0%
Modal unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
Modal rerender	0.30ms	0.00ms	±0.48ms	2	+0.0%
Modal slide-animation	0.30ms	0.00ms	±0.48ms	1	+0.0%
Modal fade-animation	0.30ms	0.00ms	±0.48ms	1	+0.0%
Modal transparent	0.40ms	0.00ms	±0.52ms	1	+0.0%
Modal with-callbacks	0.40ms	0.00ms	±0.52ms	1	+0.0%
Modal rich-content	1.60ms	2.00ms	±0.52ms	1	+0.0%
Modal with-accessibility	0.20ms	0.00ms	±0.42ms	1	+0.0%

Image

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Image mount	0.10ms	0.00ms	±0.32ms	1	+0.0%
Image unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
Image rerender	0.20ms	0.00ms	±0.42ms	2	+0.0%
Image with-resize-mode	0.10ms	0.00ms	±0.32ms	1	+0.0%
Image with-border-radius	0.10ms	0.00ms	±0.32ms	1	+0.0%
Image with-tint-color	0.20ms	0.00ms	±0.42ms	1	+0.0%
Image with-blur-radius	0.20ms	0.00ms	±0.42ms	1	+0.0%
Image with-accessibility	0.20ms	0.00ms	±0.42ms	1	+0.0%
Image multiple-10	0.87ms	1.00ms	±0.35ms	1	+0.0%
Image multiple-50	3.87ms	4.00ms	±0.35ms	1	+33.3%
Image multiple-100	8.13ms	8.00ms	±1.19ms	1	+0.0%

ActivityIndicator

Scenario	Mean	Median	StdDev	Renders	vs Baseline
ActivityIndicator mount	0.20ms	0.00ms	±0.42ms	1	+0.0%
ActivityIndicator unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
ActivityIndicator rerender	0.60ms	0.00ms	±1.26ms	2	+0.0%
ActivityIndicator size-large	0.20ms	0.00ms	±0.42ms	1	+0.0%
ActivityIndicator size-small	0.20ms	0.00ms	±0.42ms	1	+0.0%
ActivityIndicator with-color	0.10ms	0.00ms	±0.32ms	1	+0.0%
ActivityIndicator not-animating	0.20ms	0.00ms	±0.42ms	1	+0.0%
ActivityIndicator with-accessibility	0.10ms	0.00ms	±0.32ms	1	+0.0%
ActivityIndicator multiple-10	1.00ms	1.00ms	±0.00ms	1	+0.0%
ActivityIndicator multiple-50	3.67ms	4.00ms	±0.72ms	1	+0.0%
ActivityIndicator multiple-100	8.07ms	8.00ms	±0.88ms	1	+14.3%

Switch

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Switch mount	0.30ms	0.00ms	±0.48ms	1	+0.0%
Switch unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
Switch rerender	0.40ms	0.00ms	±0.52ms	2	-100.0%
Switch value-true	0.20ms	0.00ms	±0.42ms	1	+0.0%
Switch disabled	0.30ms	0.00ms	±0.48ms	1	+0.0%
Switch custom-colors	0.30ms	0.00ms	±0.48ms	1	+0.0%
Switch on-value-change	0.20ms	0.00ms	±0.42ms	1	+0.0%
Switch with-accessibility	0.30ms	0.00ms	±0.48ms	1	+0.0%
Switch multiple-10	1.60ms	2.00ms	±0.51ms	1	+0.0%
Switch multiple-50	9.93ms	9.00ms	±2.46ms	1	+0.0%
Switch multiple-100	17.67ms	17.00ms	±2.32ms	1	+6.3%

Button

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Button mount	0.60ms	1.00ms	±0.52ms	1	+0.0%
Button unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
Button rerender	1.20ms	1.00ms	±1.14ms	2	+0.0%
Button disabled	0.70ms	1.00ms	±0.48ms	1	+0.0%
Button with-color	0.50ms	0.50ms	±0.53ms	1	+0.0%
Button with-accessibility	0.50ms	0.50ms	±0.53ms	1	-50.0%
Button multiple-10	5.53ms	5.00ms	±1.41ms	1	-16.7%
Button multiple-50	21.67ms	24.00ms	±8.06ms	1	-11.1%
Button multiple-100	15.33ms	15.00ms	±2.61ms	1	-21.1%

TextInput

Scenario	Mean	Median	StdDev	Renders	vs Baseline
TextInput mount	0.20ms	0.00ms	±0.42ms	1	+0.0%
TextInput unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
TextInput rerender	0.30ms	0.00ms	±0.48ms	2	+0.0%
TextInput multiline	0.20ms	0.00ms	±0.42ms	1	+0.0%
TextInput with-value	0.10ms	0.00ms	±0.32ms	1	+0.0%
TextInput styled	0.20ms	0.00ms	±0.42ms	1	+0.0%
TextInput multiple-100	8.13ms	8.00ms	±1.64ms	1	+14.3%

View

Scenario	Mean	Median	StdDev	Renders	vs Baseline
View mount	0.30ms	0.00ms	±0.48ms	1	+0.0%
View unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
View rerender	0.30ms	0.00ms	±0.48ms	2	+0.0%
View nested-50	3.87ms	4.00ms	±1.30ms	1	+33.3%
View nested-100	8.60ms	8.00ms	±1.84ms	1	+14.3%
View shadow	0.20ms	0.00ms	±0.42ms	1	+0.0%
View border-radius	0.10ms	0.00ms	±0.32ms	1	+0.0%
View nested-500	17.80ms	10.00ms	±14.00ms	1	+0.0%

Text

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Text mount	0.10ms	0.00ms	±0.32ms	1	+0.0%
Text unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
Text rerender	0.30ms	0.00ms	±0.48ms	2	+0.0%
Text long-1000	0.20ms	0.00ms	±0.42ms	1	+0.0%
Text nested	0.20ms	0.00ms	±0.42ms	1	+0.0%
Text styled	0.20ms	0.00ms	±0.42ms	1	+0.0%
Text multiple-100	9.20ms	9.00ms	±1.74ms	1	+28.6%

SectionList.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
SectionList native mount	5.59ms	5.33ms	±0.77ms	1	-18.1%

FlatList.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
FlatList native mount	5.97ms	5.48ms	±1.35ms	1	-40.6%

TouchableHighlight.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
TouchableHighlight native mount	1.64ms	1.60ms	±0.12ms	1	-23.5%

TouchableOpacity.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
TouchableOpacity native mount	2.27ms	2.13ms	±0.29ms	1	-32.0%

Pressable.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Pressable native mount	2.06ms	1.87ms	±0.34ms	1	-25.5%

ScrollView.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
ScrollView native mount	5.13ms	5.68ms	±1.33ms	1	+40.2%

ActivityIndicator.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
ActivityIndicator native mount	1.67ms	1.65ms	±0.16ms	1	-33.6%

TextInput.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
TextInput native mount	2.67ms	2.73ms	±0.41ms	1	-33.1%

Switch.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Switch native mount	1.34ms	1.27ms	±0.18ms	1	-26.5%

Button.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Button native mount	2.23ms	2.04ms	±0.46ms	1	-21.5%

Modal.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Modal native mount	1.27ms	1.28ms	±0.07ms	1	+5.0%

Image.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Image native mount	2.10ms	2.07ms	±0.36ms	1	-8.6%

View.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
View native mount	1.36ms	1.30ms	±0.22ms	1	-8.9%

Text.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Text native mount	1.66ms	1.61ms	±0.19ms	1	-7.3%

Saadnajmi · 2026-04-06T23:04:28Z

+  # Remove postinstall to avoid running build during install
  - pwsh: |
      $packageJson = Get-Content ./package.json | ConvertFrom-Json
      $packageJson.scripts = $packageJson.scripts | Select-Object * -ExcludeProperty postinstall
      $packageJson | ConvertTo-Json | Out-File ./package.json
    displayName: Remove postinstall


you could set enableScripts: false too?

Oh you did. So do we need this still?

acoates-ms added 9 commits April 2, 2026 21:40

Move to yarn4

f02a2a8

Change files

e68126f

fix

4efc81f

fix

a07754d

Merge branch 'main' into yarn4

80fd23a

lint

ee702bc

Change files

e8f8f5e

fix

b321c11

Merge remote-tracking branch 'upstream/main' into yarn4

f22df29

acoates-ms changed the title ~~Yarn4~~ Switch to using yarn v4 Apr 6, 2026

acoates-ms marked this pull request as ready for review April 6, 2026 17:17

acoates-ms requested review from a team as code owners April 6, 2026 17:17

iamAbhi-916 approved these changes Apr 6, 2026

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acoates-ms enabled auto-merge (squash) April 6, 2026 17:29

bump typescript-eslint

2016e7d

acoates-ms requested a review from a team as a code owner April 6, 2026 20:24

acoates-ms added 3 commits April 6, 2026 14:23

Change files

ad8e142

fix

20e989c

Change files

26c53b6

Saadnajmi approved these changes Apr 6, 2026

View reviewed changes

Saadnajmi reviewed Apr 6, 2026

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acoates-ms merged commit ccc5cfe into microsoft:main Apr 6, 2026
31 of 32 checks passed

acoates-ms deleted the yarn4 branch April 7, 2026 15:29

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acoates-ms commented Apr 3, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Performance Test Results

❌ Regressions Detected

FlatList

✅ Passed

SectionList

TouchableOpacity

ScrollView

TouchableHighlight

Pressable

Modal

Image

ActivityIndicator

Switch

Button

TextInput

View

Text

SectionList.native-perf-test.ts

FlatList.native-perf-test.ts

TouchableHighlight.native-perf-test.ts

TouchableOpacity.native-perf-test.ts

Pressable.native-perf-test.ts

ScrollView.native-perf-test.ts

ActivityIndicator.native-perf-test.ts

TextInput.native-perf-test.ts

Switch.native-perf-test.ts

Button.native-perf-test.ts

Modal.native-perf-test.ts

Image.native-perf-test.ts

View.native-perf-test.ts

Text.native-perf-test.ts

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acoates-ms commented Apr 3, 2026 •

edited

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