fix: WebSocket binaryType handling — stop unconditional Blob interception of binary messages by gmacmaster · Pull Request #16173 · microsoft/react-native-windows

Gordon MacMaster (gmacmaster) · 2026-05-22T00:29:35Z

Description

WebSocket binaryType = 'arraybuffer' is silently broken on React Native Windows.

Type of Change

Bug fix (non-breaking change which fixes an issue)

Why

WebSocket binaryType = 'arraybuffer' is silently broken on React Native Windows. All binary WebSocket messages are unconditionally intercepted by BlobWebSocketModuleContentHandler and converted to Blobs, regardless of whether the socket has been registered for blob handling via addWebSocketHandler. This means:

Setting binaryType = 'arraybuffer' has no effect — binary messages still arrive as Blobs
The JavaScript-side WebSocket.js never executes its base64-to-ArrayBuffer conversion path for binary messages
Applications relying on ArrayBuffer delivery (e.g., PowerSync, binary protocol clients) are forced to implement custom Blob-to-ArrayBuffer conversion patches
This diverges from the behavior on iOS and Android, where binaryType correctly controls binary message delivery format.

What

The root cause is in DefaultBlobResource.cpp: IBlobResource::Make() unconditionally registers a BlobWebSocketModuleContentHandler on the ReactContext property bag, and WebSocketModule.cpp routes all binary messages through it without checking whether the specific socket was registered via addWebSocketHandler.

The BlobWebSocketModuleContentHandler already tracks registered socket IDs in m_socketIds (populated by Register/Unregister), but this set was never consulted during message processing.

Changes across 4 files:

IWebSocketModuleContentHandler.h — Changed both ProcessMessage overloads from void to bool return type. true = message was handled by the content handler; false = caller should fall back to default delivery.

DefaultBlobResource.h — Updated BlobWebSocketModuleContentHandler::ProcessMessage signatures to return bool.

DefaultBlobResource.cpp — Both ProcessMessage overloads now read the socket ID from params["id"], acquire m_mutex, and check m_socketIds. If the socket is not registered, they return false without processing. This check is atomic with the message processing, avoiding any TOCTOU gap between a separate Supports() check and ProcessMessage.

WebSocketModule.cpp — The SetOnMessage callback now checks the bool return value from ProcessMessage. If false, it falls through to the default path (args["data"] = message), which delivers the base64-encoded binary data to JavaScript where WebSocket.js decodes it to an ArrayBuffer.

Behavior after the fix:

binaryType = 'blob' (socket registered via addWebSocketHandler) — binary messages delivered as Blobs, same as before.
binaryType = 'arraybuffer' or default (socket not registered) — binary messages delivered as ArrayBuffer via the standard JS-side base64 decode path.
Screenshots
N/A — this is a data-path fix with no UI changes. Verified by observing WebSocket message delivery type in application-level diagnostics.

Testing

Verified end-to-end on a Windows device running a React Native application with PowerSync (real-time sync over binary WebSocket):

Before fix: All binary messages hit Blob conversion path (fileReader branch in application diagnostic stats), binaryType = 'arraybuffer' caused silent message drops.
After fix: All binary messages hit the passthrough/ArrayBuffer path (passthrough branch active, fileReader: 0), no message drops.
Tested both binaryType modes:

'arraybuffer' — messages arrive as ArrayBuffer in MessageEvent.data (was broken, now works)
'blob' — messages arrive as Blob in MessageEvent.data (still works, no regression)

Changelog

Should this change be included in the release notes: yes

Fix WebSocket binaryType handling on Windows — binary messages are no longer unconditionally converted to Blobs. Sockets using binaryType = 'arraybuffer' (the standard default) now correctly receive ArrayBuffer data.

Microsoft Reviewers: Open in CodeFlow

* blob support * pr comments * pr comments * Update DefaultBlobResource.cpp

Julio César Rocha (JunielKatarn) · 2026-05-22T07:43:57Z

@microsoft/jshost allow me to review before approving.

Gordon MacMaster (gmacmaster) · 2026-05-27T02:11:52Z

Julio César Rocha (@JunielKatarn) have you had a chance to review?

Julio César Rocha (JunielKatarn) · 2026-05-31T08:58:11Z

Beginning review.

Julio César Rocha (JunielKatarn) · 2026-05-31T21:57:11Z

I have submitted a PR to your branch adding a test for this use case which will eventually be part of our automation.
Virtual-Fulfillment-Technologies-Inc#9
Feel free to adapt or improve if it doesn't properly test your change.

The change looks correct.
I only have feedback on where part of the implementation takes place and perhaps some naming convention.
I will add those specifics directly on the files section.

* Add WebSocketArrayBuffer headless test * Skip test by default

Gordon MacMaster (gmacmaster) · 2026-06-01T12:35:07Z

Julio César Rocha (@JunielKatarn) Comments addressed

github-actions · 2026-06-02T02:39:47Z

Performance Test Results

Branch: vendora/fix-websockets
Commit: 1260fbc4
Time: 2026-06-05T23:34:12.681Z
Tests: 161/161 passed

✅ Passed

161 scenario(s) across 28 suite(s) — no regressions

SectionList

Scenario	Mean	Median	StdDev	Renders	vs Baseline
SectionList mount	2.60ms	2.00ms	±1.65ms	1	-60.0%
SectionList unmount	0.20ms	0.00ms	±0.42ms	0	+0.0%
SectionList rerender	6.20ms	6.00ms	±1.75ms	2	-42.9%
SectionList with-3-sections-15-items	3.00ms	3.00ms	±0.67ms	1	-45.5%
SectionList with-5-sections-50-items	3.10ms	3.00ms	±1.52ms	1	-50.0%
SectionList with-10-sections-200-items	2.40ms	2.00ms	±0.52ms	1	-63.6%
SectionList with-20-sections-200-items	2.60ms	2.00ms	±1.35ms	1	-60.0%
SectionList with-section-separator	1.10ms	1.00ms	±0.32ms	1	-50.0%
SectionList with-item-separator	1.60ms	1.00ms	±1.26ms	1	-50.0%
SectionList with-header-footer	1.00ms	1.00ms	±0.00ms	1	-50.0%
SectionList with-section-footer	1.20ms	1.00ms	±1.40ms	1	-50.0%
SectionList with-sticky-section-headers	1.00ms	1.00ms	±0.00ms	1	-50.0%
SectionList with-empty-list	0.20ms	0.00ms	±0.42ms	1	-100.0%
SectionList with-50-sections-1000-items	0.80ms	1.00ms	±0.42ms	1	-50.0%

FlatList

Scenario	Mean	Median	StdDev	Renders	vs Baseline
FlatList mount	2.50ms	2.50ms	±0.53ms	1	-37.5%
FlatList unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
FlatList rerender	5.50ms	5.00ms	±1.78ms	2	-44.4%
FlatList with-10-items	2.30ms	2.00ms	±0.48ms	1	-50.0%
FlatList with-100-items	3.10ms	3.00ms	±1.20ms	1	-40.0%
FlatList with-500-items	2.50ms	2.50ms	±0.53ms	1	-37.5%
FlatList with-1000-items	2.70ms	2.00ms	±1.25ms	1	-50.0%
FlatList horizontal	2.40ms	3.00ms	±0.97ms	1	-40.0%
FlatList with-separator	1.00ms	1.00ms	±0.00ms	1	-50.0%
FlatList with-header-footer	0.80ms	1.00ms	±0.42ms	1	-50.0%
FlatList with-empty-list	0.10ms	0.00ms	±0.32ms	1	-100.0%
FlatList with-get-item-layout	1.40ms	1.00ms	±1.26ms	1	+0.0%
FlatList inverted	0.70ms	1.00ms	±0.48ms	1	-33.3%
FlatList with-num-columns	1.30ms	1.00ms	±0.48ms	1	-66.7%

TouchableOpacity

Scenario	Mean	Median	StdDev	Renders	vs Baseline
TouchableOpacity mount	0.60ms	1.00ms	±0.52ms	1	+0.0%
TouchableOpacity unmount	0.10ms	0.00ms	±0.32ms	0	+0.0%
TouchableOpacity rerender	0.60ms	0.00ms	±1.26ms	2	-100.0%
TouchableOpacity custom-active-opacity	0.40ms	0.00ms	±0.52ms	1	-100.0%
TouchableOpacity disabled	0.20ms	0.00ms	±0.42ms	1	-100.0%
TouchableOpacity with-all-handlers	0.30ms	0.00ms	±0.48ms	1	-100.0%
TouchableOpacity with-hit-slop	0.60ms	1.00ms	±0.52ms	1	+0.0%
TouchableOpacity with-delay	0.40ms	0.00ms	±0.52ms	1	-100.0%
TouchableOpacity nested	0.60ms	1.00ms	±0.52ms	1	+0.0%
TouchableOpacity multiple-10	3.13ms	3.00ms	±1.68ms	1	-50.0%
TouchableOpacity multiple-50	13.07ms	12.00ms	±2.49ms	1	-58.6%
TouchableOpacity multiple-100	10.87ms	10.00ms	±2.42ms	1	-80.0%

ScrollView

Scenario	Mean	Median	StdDev	Renders	vs Baseline
ScrollView mount	0.20ms	0.00ms	±0.42ms	1	+0.0%
ScrollView unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
ScrollView rerender	0.30ms	0.00ms	±0.48ms	2	-100.0%
ScrollView children-20	1.67ms	2.00ms	±0.49ms	1	-50.0%
ScrollView children-100	9.27ms	9.00ms	±1.28ms	1	-43.8%
ScrollView horizontal	1.90ms	2.00ms	±0.57ms	1	-50.0%
ScrollView sticky-headers	1.90ms	2.00ms	±1.20ms	1	-33.3%
ScrollView scroll-indicators	0.30ms	0.00ms	±0.48ms	1	-100.0%
ScrollView nested	0.80ms	1.00ms	±0.63ms	1	+0.0%
ScrollView content-container-style	0.40ms	0.00ms	±0.52ms	1	-100.0%
ScrollView children-500	12.40ms	12.00ms	±3.04ms	1	-36.8%

TouchableHighlight

Scenario	Mean	Median	StdDev	Renders	vs Baseline
TouchableHighlight mount	0.20ms	0.00ms	±0.42ms	1	-100.0%
TouchableHighlight unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
TouchableHighlight rerender	0.20ms	0.00ms	±0.42ms	2	-100.0%
TouchableHighlight custom-underlay-color	0.60ms	0.00ms	±1.26ms	1	+0.0%
TouchableHighlight custom-active-opacity	0.20ms	0.00ms	±0.42ms	1	+0.0%
TouchableHighlight disabled	0.20ms	0.00ms	±0.42ms	1	+0.0%
TouchableHighlight with-all-handlers	0.20ms	0.00ms	±0.42ms	1	+0.0%
TouchableHighlight with-hit-slop	0.20ms	0.00ms	±0.42ms	1	+0.0%
TouchableHighlight nested-touchables	0.30ms	0.00ms	±0.48ms	1	-100.0%
TouchableHighlight multiple-touchables-10	1.10ms	1.00ms	±0.32ms	1	-66.7%
TouchableHighlight multiple-touchables-50	7.10ms	7.00ms	±1.79ms	1	-44.0%
TouchableHighlight multiple-touchables-100	13.30ms	13.50ms	±1.25ms	1	-40.0%

Pressable

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Pressable mount	0.10ms	0.00ms	±0.32ms	1	+0.0%
Pressable unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
Pressable rerender	0.40ms	0.00ms	±0.52ms	2	-100.0%
Pressable with-all-handlers	0.10ms	0.00ms	±0.32ms	1	+0.0%
Pressable with-style-function	0.10ms	0.00ms	±0.32ms	1	+0.0%
Pressable disabled	0.20ms	0.00ms	±0.42ms	1	+0.0%
Pressable with-hit-slop	0.10ms	0.00ms	±0.32ms	1	+0.0%
Pressable nested	0.30ms	0.00ms	±0.48ms	1	-100.0%
Pressable multiple-10	1.67ms	1.00ms	±1.29ms	1	-66.7%
Pressable multiple-50	8.13ms	7.00ms	±1.96ms	1	-50.0%
Pressable multiple-100	9.93ms	9.00ms	±5.73ms	1	-25.0%

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	0.10ms	0.00ms	±0.32ms	1	+0.0%
Modal fade-animation	0.20ms	0.00ms	±0.42ms	1	+0.0%
Modal transparent	0.20ms	0.00ms	±0.42ms	1	+0.0%
Modal with-callbacks	0.10ms	0.00ms	±0.32ms	1	+0.0%
Modal rich-content	0.90ms	1.00ms	±0.32ms	1	-50.0%
Modal with-accessibility	0.10ms	0.00ms	±0.32ms	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	0.10ms	0.00ms	±0.32ms	1	+0.0%
Image with-blur-radius	0.10ms	0.00ms	±0.32ms	1	+0.0%
Image with-accessibility	0.40ms	0.00ms	±1.26ms	1	+0.0%
Image multiple-10	0.47ms	0.00ms	±0.52ms	1	-100.0%
Image multiple-50	1.93ms	2.00ms	±0.26ms	1	-33.3%
Image multiple-100	4.73ms	4.00ms	±1.16ms	1	-50.0%

ActivityIndicator

Scenario	Mean	Median	StdDev	Renders	vs Baseline
ActivityIndicator mount	0.10ms	0.00ms	±0.32ms	1	+0.0%
ActivityIndicator unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
ActivityIndicator rerender	0.10ms	0.00ms	±0.32ms	2	+0.0%
ActivityIndicator size-large	0.10ms	0.00ms	±0.32ms	1	+0.0%
ActivityIndicator size-small	0.10ms	0.00ms	±0.32ms	1	+0.0%
ActivityIndicator with-color	0.10ms	0.00ms	±0.32ms	1	+0.0%
ActivityIndicator not-animating	0.10ms	0.00ms	±0.32ms	1	+0.0%
ActivityIndicator with-accessibility	0.10ms	0.00ms	±0.32ms	1	+0.0%
ActivityIndicator multiple-10	0.47ms	0.00ms	±0.52ms	1	-100.0%
ActivityIndicator multiple-50	2.07ms	2.00ms	±0.26ms	1	-50.0%
ActivityIndicator multiple-100	4.40ms	4.00ms	±0.91ms	1	-42.9%

Switch

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Switch mount	0.10ms	0.00ms	±0.32ms	1	+0.0%
Switch unmount	0.10ms	0.00ms	±0.32ms	0	+0.0%
Switch rerender	0.30ms	0.00ms	±0.48ms	2	-100.0%
Switch value-true	0.10ms	0.00ms	±0.32ms	1	+0.0%
Switch disabled	0.10ms	0.00ms	±0.32ms	1	+0.0%
Switch custom-colors	0.10ms	0.00ms	±0.32ms	1	+0.0%
Switch on-value-change	0.10ms	0.00ms	±0.32ms	1	+0.0%
Switch with-accessibility	0.10ms	0.00ms	±0.32ms	1	+0.0%
Switch multiple-10	0.87ms	1.00ms	±0.35ms	1	-50.0%
Switch multiple-50	5.33ms	4.00ms	±2.32ms	1	-55.6%
Switch multiple-100	9.53ms	9.00ms	±2.45ms	1	-43.8%

Button

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Button mount	0.30ms	0.00ms	±0.48ms	1	-100.0%
Button unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
Button rerender	0.90ms	1.00ms	±1.20ms	2	+0.0%
Button disabled	0.30ms	0.00ms	±0.48ms	1	-100.0%
Button with-color	0.30ms	0.00ms	±0.48ms	1	-100.0%
Button with-accessibility	0.20ms	0.00ms	±0.42ms	1	-100.0%
Button multiple-10	3.13ms	3.00ms	±1.19ms	1	-50.0%
Button multiple-50	11.20ms	13.00ms	±4.59ms	1	-51.9%
Button multiple-100	8.27ms	8.00ms	±1.71ms	1	-57.9%

TextInput

Scenario	Mean	Median	StdDev	Renders	vs Baseline
TextInput mount	0.10ms	0.00ms	±0.32ms	1	+0.0%
TextInput unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
TextInput rerender	0.20ms	0.00ms	±0.42ms	2	+0.0%
TextInput multiline	0.10ms	0.00ms	±0.32ms	1	+0.0%
TextInput with-value	0.10ms	0.00ms	±0.32ms	1	+0.0%
TextInput styled	0.00ms	0.00ms	±0.00ms	1	+0.0%
TextInput multiple-100	4.20ms	4.00ms	±1.15ms	1	-42.9%

View

Scenario	Mean	Median	StdDev	Renders	vs Baseline
View mount	0.10ms	0.00ms	±0.32ms	1	+0.0%
View unmount	0.00ms	0.00ms	±0.00ms	0	+0.0%
View rerender	0.10ms	0.00ms	±0.32ms	2	+0.0%
View nested-50	2.07ms	2.00ms	±1.22ms	1	-33.3%
View nested-100	4.33ms	4.00ms	±1.40ms	1	-42.9%
View shadow	0.10ms	0.00ms	±0.32ms	1	+0.0%
View border-radius	0.10ms	0.00ms	±0.32ms	1	+0.0%
View nested-500	10.47ms	7.00ms	±7.55ms	1	-30.0%

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	0.40ms	0.00ms	±1.26ms	2	+0.0%
Text long-1000	0.10ms	0.00ms	±0.32ms	1	+0.0%
Text nested	0.10ms	0.00ms	±0.32ms	1	+0.0%
Text styled	0.10ms	0.00ms	±0.32ms	1	+0.0%
Text multiple-100	4.87ms	5.00ms	±1.13ms	1	-28.6%

SectionList.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
SectionList native mount	2.96ms	2.79ms	±0.45ms	1	-57.1%

FlatList.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
FlatList native mount	3.66ms	3.20ms	±1.32ms	1	-65.3%

TouchableHighlight.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
TouchableHighlight native mount	0.93ms	0.90ms	±0.19ms	1	-57.0%

TouchableOpacity.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
TouchableOpacity native mount	1.13ms	1.07ms	±0.17ms	1	-65.9%

Pressable.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Pressable native mount	0.90ms	0.89ms	±0.10ms	1	-64.4%

ScrollView.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
ScrollView native mount	2.26ms	2.22ms	±0.27ms	1	-45.2%

ActivityIndicator.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
ActivityIndicator native mount	1.22ms	1.12ms	±0.31ms	1	-54.7%

TextInput.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
TextInput native mount	1.67ms	1.40ms	±0.70ms	1	-65.8%

Switch.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Switch native mount	0.70ms	0.62ms	±0.24ms	1	-64.4%

Button.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Button native mount	1.05ms	1.03ms	±0.12ms	1	-60.4%

Modal.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Modal native mount	0.74ms	0.48ms	±0.66ms	1	-60.5%

Image.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Image native mount	1.58ms	1.36ms	±0.74ms	1	-39.7%

View.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
View native mount	0.57ms	0.52ms	±0.15ms	1	-63.8%

Text.native-perf-test.ts

Scenario	Mean	Median	StdDev	Renders	vs Baseline
Text native mount	0.75ms	0.71ms	±0.10ms	1	-59.1%

Andrew Coates (acoates-ms) · 2026-06-02T02:43:38Z

/azp run

azure-pipelines · 2026-06-02T02:44:06Z

Azure Pipelines successfully started running 1 pipeline(s).

Gordon MacMaster (gmacmaster) · 2026-06-02T12:06:26Z

Andrew Coates (@acoates-ms) these are just the random failures right? Just needs a rerun?

Julio César Rocha (JunielKatarn) · 2026-06-04T01:04:24Z

Andrew Coates (@acoates-ms) these are just the random failures right? Just needs a rerun?

Looks like it.
However, a JavaScript validation (yarn lint) also failed.
This is most likely a missing registration for the JavaScript test.
I'll look into it and propose a change.

Julio César Rocha (JunielKatarn) · 2026-06-04T21:52:20Z

See Virtual-Fulfillment-Technologies-Inc#10

Gordon MacMaster (gmacmaster) · 2026-06-05T12:47:42Z

See Virtual-Fulfillment-Technologies-Inc#10

Merged

Julio César Rocha (JunielKatarn) · 2026-06-05T23:39:21Z

/azp run

azure-pipelines · 2026-06-05T23:39:47Z

Azure Pipelines successfully started running 1 pipeline(s).

Julio César Rocha (JunielKatarn) · 2026-06-06T00:37:00Z

Failing validation is due unrelated changes after the build image upgrade.
Please pull the latest main. Almost ready to merge.

Gordon MacMaster (gmacmaster) · 2026-06-06T12:27:57Z

Failing validation is due unrelated changes after the build image upgrade. Please pull the latest main. Almost ready to merge.

Just pulled

Julio César Rocha (JunielKatarn) · 2026-06-06T22:32:06Z

/azp run

azure-pipelines · 2026-06-06T22:32:33Z

Azure Pipelines successfully started running 1 pipeline(s).

* Upgrade to PowerShell 7 (#16075) * Ran NuGetRestoreForceEvaluateAllSolutions.ps1 * Define installNuGetPackages task; Install pwsh 7.6.1 * Replace powershell.exe with pwsh.exe * Change files * CI: Ensure NuGet is availabe before `yarn install` * Add NuGetAuthenticate before yarn install * Do not download PowerShell on CI/CD environments * Fix just-task JS syntax * Add dotnet-tools manifest * Fix pwsh.exe tool path * Resolve dotnet-tools.json path * Use dotnet for `nuget locals` * Use PWSH in nuget-restore-task.js * Break dependency loop in just-task * Update other ADO tasks * Update @react-native-windows/automation * Rename findPwsh as findPowerShell * Drop powershell export from commandWithProgress * Change files * Add README for find-dotnet-tools * Add README to package.json * Adjust newline * Run task `installDotnetTools` only when not in CI * Install .NET tools in CI * Install .NET on prepare-js-env * Do not install .NET tools on CI * Quote powershell path * fix yarn lint * Ran NuGetRestoreForceEvaluateAllSolutions.ps1 * Restore deleted lock files * Add missing dependency * Use -Command for compatible PWSH calls * Use -Command pwsh argument * Correct runPowerShellScriptFunction cmd escaping * Quote pwsh command in runPowerShellScriptFunction * Remove quotes * Quote remaining findPowerShell() calls for execSync * Add temporary diagnostic commands * Diagnostics * Diagnostics * Diagnostics * Add runPowerShellScriptFunction argument to delegate Appx-related commands to Windows PowerShell * Remove diagnostics steps * Use execFileSync instead of execSync in deploy.ts * Remove querystrings from FS paths * Suppress warning when using `-UseWindowsPowerShell` * Revert "Remove querystrings from FS paths" This reverts commit e1f3cfd. * Use pipe semantics for Get-AppxPackage in resolveAppName * Hard-fail if PowerShell 7 cannot be found. Do not fall back to Windows PowerShell (powershell.exe). PowerShell code may not be backwards compatible. * Improve missing pwsh.exe error message * Add package resolution pipeline test * UseWindowsPowerShell for package resolution test * Try to read package Microsoft.PrintDialog * Replace stderr redirection with -WarningAction * Replace stderr redirection with -WarningAction * Print sample app names on appWindow error * Add more diagnostics * Add missing -WarningAction SilentlyContinue * Revert "Add more diagnostics" This reverts commit 8c10bc4. * Revert "Print sample app names on appWindow error" This reverts commit 6e70148. * Remove CI probing tasks * Revert "Use pipe semantics for Get-AppxPackage in resolveAppName" This reverts commit 6c46c73. Co-authored-by: Copilot <copilot@github.com> * Remove unused escaping logic * Re-introduce deleted .lock.json --------- Co-authored-by: Copilot <copilot@github.com> * Fix PowerShell installation (#16164) * Defer findPowershell to layoutMSRNCxx * Change files * Upgrade to Visual Studio 2026 (#16170) * Update deps script. TODO: test * Upgrade rnw-deps to .NET 10 * Defer findPowershell to layoutMSRNCxx * Upgrade VS version to 18.6.1 * Drop /async in MSVC 14.5 * Replace std::future coroutines with WinRT types * clang format * Change files * Drop Windows10SDK.19041 * Change files * Set TargetFramework to net10.0-windows10.0.26100.0 * Use IAsyncOperation instead of out parameters * Install .NET 10 * Revert "Install .NET 10" This reverts commit 5f75dc0. * Revert "Set TargetFramework to net10.0-windows10.0.26100.0" This reverts commit 22a4791. * clang format * Upgrade CsWinRT.csproj to .NET 8 * Fix filters * Upgrade MSRN SLN to VS 18 * Revert parameter signature in LoadBundleAsync * Update CSWinRT lock * Allow all versions of VS 2026 * Use IBuffer instead of hstring as payload GetJavaScriptFromServerAsync retuns bundle contents as hstring (16 bit) It then gets converted to an 8-bit string. This conversion drops bytes consideres "invalid". Those bytes are expected as part of the Hermes bundle header. Transmitting the bundle as an IBuffer preserves the original bytes and avoids the conversion issues. * Potential fix for pull request finding Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> * Use WinRT exception types instead of std --------- Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> * Upgrade to GoogleTest Adapter 1.8.1.8 (#16218) * Upgrade to GoogleTest adapter 1.8.1.8 * Change files * Update package lock files * Upgrade CI agents to Windows Server 2025 (#16208) * Use image rnw-img-vs2026-node24 * Update fork-sync/bin.js chmod * Upgrade to MSVC 14.5 * Drop -UseWindowsPowerShell fallback * Manually install yarn * Upgrade to .NET Hosting Bundle 10.0.8 * Change files * Fix change file * Add temp npm install yarn in templates * Test yarn location * update * update * TEMPORARILY revert agent image * Print yarn version in setup * Revert "TEMPORARILY revert agent image" This reverts commit 7c175e1. * update * update * update * Upgrade to msbuildVersion: 18.0 * Update Google test adapter location * Remove unused statement * Remove probing tasks * Upgrade to VSTest@3 * Upgrade more projects and scripts to VS 2026 * Explicitly set vstest.console location * Install midgard-yarn and verdaccio in-place * Fix yarn version * Update node-tests version * Use pwsh in Add-AppDevPackage * Make WindowsStoreAppUtils use PowerShell 7 * Update snapshot values * Update snapshot from failing x86 run * Use the --tag argument for verdaccio under Node 24 * Ignore/warn on unstable click test * Enable WMIC for RN Doctor * Disable RN doctor until it drops WMIC * Add rnw-img-vs2026-node24.json (#16224) * Update CI verdaccio to 6.7.2 (#16223) * Upgrade to Microsoft.WindowsAppSDK 1.8.260508005 (#16225) * Upgrade to Microsoft.WindowsAppSDK 1.8.260508005 * Change files * fix: WebSocket binaryType handling — stop unconditional Blob interception of binary messages (#16173) * blob support (#8) * blob support * pr comments * pr comments * Update DefaultBlobResource.cpp * Create react-native-windows-c3827e14-777b-475a-bf00-dc169bf89f3d.json * Add WebSocketArrayBuffer headless test (#9) * Add WebSocketArrayBuffer headless test * Skip test by default * pr comments * Update overrides (#10) --------- Co-authored-by: Julio César Rocha <JunielKatarn@users.noreply.github.com> * Upgrade projects to .NET 10 (#16226) * Upgrade projects to .NET 10 * Upgrade lock files * Change files * Fix missing conflicts * Update packages lock * Remove extra yarn step * Re-introduce JS Desktop integration tests (#16228) * Remove redundant condition Desktop.IntegrationTests.SkipRNTester Modify Desktop.IntegrationTests.Filter instead. * Re-introduce WebSocket and WebSocketBlob tests * Make WSBlob test compare contents * Rename method to RunTest * Handle initial message from default endpoint * Change files * Migrate XHR test * Port Fetch test * Port Blob test * WebSocketMultipleSendTest * Remove JS WebSocket servers * Skip in CI for now * Remove ban-types * Fix DynamicReaderWriterTests * Use WinRT coroutine types for UwpScriptStore * clang format --------- Co-authored-by: Copilot <copilot@github.com> Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> Co-authored-by: Gordon MacMaster <31481849+gmacmaster@users.noreply.github.com>

* Upgrade to PowerShell 7 (#16075) * Ran NuGetRestoreForceEvaluateAllSolutions.ps1 * Define installNuGetPackages task; Install pwsh 7.6.1 * Replace powershell.exe with pwsh.exe * Change files * CI: Ensure NuGet is availabe before `yarn install` * Add NuGetAuthenticate before yarn install * Do not download PowerShell on CI/CD environments * Fix just-task JS syntax * Add dotnet-tools manifest * Fix pwsh.exe tool path * Resolve dotnet-tools.json path * Use dotnet for `nuget locals` * Use PWSH in nuget-restore-task.js * Break dependency loop in just-task * Update other ADO tasks * Update @react-native-windows/automation * Rename findPwsh as findPowerShell * Drop powershell export from commandWithProgress * Change files * Add README for find-dotnet-tools * Add README to package.json * Adjust newline * Run task `installDotnetTools` only when not in CI * Install .NET tools in CI * Install .NET on prepare-js-env * Do not install .NET tools on CI * Quote powershell path * fix yarn lint * Ran NuGetRestoreForceEvaluateAllSolutions.ps1 * Restore deleted lock files * Add missing dependency * Use -Command for compatible PWSH calls * Use -Command pwsh argument * Correct runPowerShellScriptFunction cmd escaping * Quote pwsh command in runPowerShellScriptFunction * Remove quotes * Quote remaining findPowerShell() calls for execSync * Add temporary diagnostic commands * Diagnostics * Diagnostics * Diagnostics * Add runPowerShellScriptFunction argument to delegate Appx-related commands to Windows PowerShell * Remove diagnostics steps * Use execFileSync instead of execSync in deploy.ts * Remove querystrings from FS paths * Suppress warning when using `-UseWindowsPowerShell` * Revert "Remove querystrings from FS paths" This reverts commit e1f3cfd. * Use pipe semantics for Get-AppxPackage in resolveAppName * Hard-fail if PowerShell 7 cannot be found. Do not fall back to Windows PowerShell (powershell.exe). PowerShell code may not be backwards compatible. * Improve missing pwsh.exe error message * Add package resolution pipeline test * UseWindowsPowerShell for package resolution test * Try to read package Microsoft.PrintDialog * Replace stderr redirection with -WarningAction * Replace stderr redirection with -WarningAction * Print sample app names on appWindow error * Add more diagnostics * Add missing -WarningAction SilentlyContinue * Revert "Add more diagnostics" This reverts commit 8c10bc4. * Revert "Print sample app names on appWindow error" This reverts commit 6e70148. * Remove CI probing tasks * Revert "Use pipe semantics for Get-AppxPackage in resolveAppName" This reverts commit 6c46c73. Co-authored-by: Copilot <copilot@github.com> * Remove unused escaping logic * Re-introduce deleted .lock.json --------- Co-authored-by: Copilot <copilot@github.com> * Fix PowerShell installation (#16164) * Defer findPowershell to layoutMSRNCxx * Change files * Upgrade to Visual Studio 2026 (#16170) * Update deps script. TODO: test * Upgrade rnw-deps to .NET 10 * Defer findPowershell to layoutMSRNCxx * Upgrade VS version to 18.6.1 * Drop /async in MSVC 14.5 * Replace std::future coroutines with WinRT types * clang format * Change files * Drop Windows10SDK.19041 * Change files * Set TargetFramework to net10.0-windows10.0.26100.0 * Use IAsyncOperation instead of out parameters * Install .NET 10 * Revert "Install .NET 10" This reverts commit 5f75dc0. * Revert "Set TargetFramework to net10.0-windows10.0.26100.0" This reverts commit 22a4791. * clang format * Upgrade CsWinRT.csproj to .NET 8 * Fix filters * Upgrade MSRN SLN to VS 18 * Revert parameter signature in LoadBundleAsync * Update CSWinRT lock * Allow all versions of VS 2026 * Use IBuffer instead of hstring as payload GetJavaScriptFromServerAsync retuns bundle contents as hstring (16 bit) It then gets converted to an 8-bit string. This conversion drops bytes consideres "invalid". Those bytes are expected as part of the Hermes bundle header. Transmitting the bundle as an IBuffer preserves the original bytes and avoids the conversion issues. * Potential fix for pull request finding Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> * Use WinRT exception types instead of std --------- Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> * Upgrade to GoogleTest Adapter 1.8.1.8 (#16218) * Upgrade to GoogleTest adapter 1.8.1.8 * Change files * Update package lock files * Upgrade CI agents to Windows Server 2025 (#16208) * Use image rnw-img-vs2026-node24 * Update fork-sync/bin.js chmod * Upgrade to MSVC 14.5 * Drop -UseWindowsPowerShell fallback * Manually install yarn * Upgrade to .NET Hosting Bundle 10.0.8 * Change files * Fix change file * Add temp npm install yarn in templates * Test yarn location * update * update * TEMPORARILY revert agent image * Print yarn version in setup * Revert "TEMPORARILY revert agent image" This reverts commit 7c175e1. * update * update * update * Upgrade to msbuildVersion: 18.0 * Update Google test adapter location * Remove unused statement * Remove probing tasks * Upgrade to VSTest@3 * Upgrade more projects and scripts to VS 2026 * Explicitly set vstest.console location * Install midgard-yarn and verdaccio in-place * Fix yarn version * Update node-tests version * Use pwsh in Add-AppDevPackage * Make WindowsStoreAppUtils use PowerShell 7 * Update snapshot values * Update snapshot from failing x86 run * Use the --tag argument for verdaccio under Node 24 * Ignore/warn on unstable click test * Enable WMIC for RN Doctor * Disable RN doctor until it drops WMIC * Add rnw-img-vs2026-node24.json (#16224) * Update CI verdaccio to 6.7.2 (#16223) * Upgrade to Microsoft.WindowsAppSDK 1.8.260508005 (#16225) * Upgrade to Microsoft.WindowsAppSDK 1.8.260508005 * Change files * fix: WebSocket binaryType handling — stop unconditional Blob interception of binary messages (#16173) * blob support (#8) * blob support * pr comments * pr comments * Update DefaultBlobResource.cpp * Create react-native-windows-c3827e14-777b-475a-bf00-dc169bf89f3d.json * Add WebSocketArrayBuffer headless test (#9) * Add WebSocketArrayBuffer headless test * Skip test by default * pr comments * Update overrides (#10) --------- Co-authored-by: Julio César Rocha <JunielKatarn@users.noreply.github.com> * Upgrade projects to .NET 10 (#16226) * Upgrade projects to .NET 10 * Upgrade lock files * Change files * Update yarn lock * Re-introduce JS Desktop integration tests (#16228) * Remove redundant condition Desktop.IntegrationTests.SkipRNTester Modify Desktop.IntegrationTests.Filter instead. * Re-introduce WebSocket and WebSocketBlob tests * Make WSBlob test compare contents * Rename method to RunTest * Handle initial message from default endpoint * Change files * Migrate XHR test * Port Fetch test * Port Blob test * WebSocketMultipleSendTest * Remove JS WebSocket servers * Skip in CI for now * Update yarn lock * Add missing find-dotnet-tools * Fix DynamicReaderWriterTests * Update yarn lock * Use WinRT coroutine types for UwpScriptStore * clang format --------- Co-authored-by: Copilot <copilot@github.com> Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> Co-authored-by: Gordon MacMaster <31481849+gmacmaster@users.noreply.github.com>

* Upgrade to PowerShell 7 (#16075) * Ran NuGetRestoreForceEvaluateAllSolutions.ps1 * Define installNuGetPackages task; Install pwsh 7.6.1 * Replace powershell.exe with pwsh.exe * Change files * CI: Ensure NuGet is availabe before `yarn install` * Add NuGetAuthenticate before yarn install * Do not download PowerShell on CI/CD environments * Fix just-task JS syntax * Add dotnet-tools manifest * Fix pwsh.exe tool path * Resolve dotnet-tools.json path * Use dotnet for `nuget locals` * Use PWSH in nuget-restore-task.js * Break dependency loop in just-task * Update other ADO tasks * Update @react-native-windows/automation * Rename findPwsh as findPowerShell * Drop powershell export from commandWithProgress * Change files * Add README for find-dotnet-tools * Add README to package.json * Adjust newline * Run task `installDotnetTools` only when not in CI * Install .NET tools in CI * Install .NET on prepare-js-env * Do not install .NET tools on CI * Quote powershell path * fix yarn lint * Ran NuGetRestoreForceEvaluateAllSolutions.ps1 * Restore deleted lock files * Add missing dependency * Use -Command for compatible PWSH calls * Use -Command pwsh argument * Correct runPowerShellScriptFunction cmd escaping * Quote pwsh command in runPowerShellScriptFunction * Remove quotes * Quote remaining findPowerShell() calls for execSync * Add temporary diagnostic commands * Diagnostics * Diagnostics * Diagnostics * Add runPowerShellScriptFunction argument to delegate Appx-related commands to Windows PowerShell * Remove diagnostics steps * Use execFileSync instead of execSync in deploy.ts * Remove querystrings from FS paths * Suppress warning when using `-UseWindowsPowerShell` * Revert "Remove querystrings from FS paths" This reverts commit e1f3cfd. * Use pipe semantics for Get-AppxPackage in resolveAppName * Hard-fail if PowerShell 7 cannot be found. Do not fall back to Windows PowerShell (powershell.exe). PowerShell code may not be backwards compatible. * Improve missing pwsh.exe error message * Add package resolution pipeline test * UseWindowsPowerShell for package resolution test * Try to read package Microsoft.PrintDialog * Replace stderr redirection with -WarningAction * Replace stderr redirection with -WarningAction * Print sample app names on appWindow error * Add more diagnostics * Add missing -WarningAction SilentlyContinue * Revert "Add more diagnostics" This reverts commit 8c10bc4. * Revert "Print sample app names on appWindow error" This reverts commit 6e70148. * Remove CI probing tasks * Revert "Use pipe semantics for Get-AppxPackage in resolveAppName" This reverts commit 6c46c73. Co-authored-by: Copilot <copilot@github.com> * Remove unused escaping logic * Re-introduce deleted .lock.json --------- Co-authored-by: Copilot <copilot@github.com> * Fix PowerShell installation (#16164) * Defer findPowershell to layoutMSRNCxx * Change files * Upgrade to Visual Studio 2026 (#16170) * Update deps script. TODO: test * Upgrade rnw-deps to .NET 10 * Defer findPowershell to layoutMSRNCxx * Upgrade VS version to 18.6.1 * Drop /async in MSVC 14.5 * Replace std::future coroutines with WinRT types * clang format * Change files * Drop Windows10SDK.19041 * Change files * Set TargetFramework to net10.0-windows10.0.26100.0 * Use IAsyncOperation instead of out parameters * Install .NET 10 * Revert "Install .NET 10" This reverts commit 5f75dc0. * Revert "Set TargetFramework to net10.0-windows10.0.26100.0" This reverts commit 22a4791. * clang format * Upgrade CsWinRT.csproj to .NET 8 * Fix filters * Upgrade MSRN SLN to VS 18 * Revert parameter signature in LoadBundleAsync * Update CSWinRT lock * Allow all versions of VS 2026 * Use IBuffer instead of hstring as payload GetJavaScriptFromServerAsync retuns bundle contents as hstring (16 bit) It then gets converted to an 8-bit string. This conversion drops bytes consideres "invalid". Those bytes are expected as part of the Hermes bundle header. Transmitting the bundle as an IBuffer preserves the original bytes and avoids the conversion issues. * Potential fix for pull request finding Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> * Use WinRT exception types instead of std --------- Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> * Upgrade to GoogleTest Adapter 1.8.1.8 (#16218) * Upgrade to GoogleTest adapter 1.8.1.8 * Change files * Update package lock files * Upgrade CI agents to Windows Server 2025 (#16208) * Use image rnw-img-vs2026-node24 * Update fork-sync/bin.js chmod * Upgrade to MSVC 14.5 * Drop -UseWindowsPowerShell fallback * Manually install yarn * Upgrade to .NET Hosting Bundle 10.0.8 * Change files * Fix change file * Add temp npm install yarn in templates * Test yarn location * update * update * TEMPORARILY revert agent image * Print yarn version in setup * Revert "TEMPORARILY revert agent image" This reverts commit 7c175e1. * update * update * update * Upgrade to msbuildVersion: 18.0 * Update Google test adapter location * Remove unused statement * Remove probing tasks * Upgrade to VSTest@3 * Upgrade more projects and scripts to VS 2026 * Explicitly set vstest.console location * Install midgard-yarn and verdaccio in-place * Fix yarn version * Update node-tests version * Use pwsh in Add-AppDevPackage * Make WindowsStoreAppUtils use PowerShell 7 * Update snapshot values * Update snapshot from failing x86 run * Use the --tag argument for verdaccio under Node 24 * Ignore/warn on unstable click test * Enable WMIC for RN Doctor * Disable RN doctor until it drops WMIC * Add rnw-img-vs2026-node24.json (#16224) * Update CI verdaccio to 6.7.2 (#16223) * Upgrade to Microsoft.WindowsAppSDK 1.8.260508005 (#16225) * Upgrade to Microsoft.WindowsAppSDK 1.8.260508005 * Change files * fix: WebSocket binaryType handling — stop unconditional Blob interception of binary messages (#16173) * blob support (#8) * blob support * pr comments * pr comments * Update DefaultBlobResource.cpp * Create react-native-windows-c3827e14-777b-475a-bf00-dc169bf89f3d.json * Add WebSocketArrayBuffer headless test (#9) * Add WebSocketArrayBuffer headless test * Skip test by default * pr comments * Update overrides (#10) --------- Co-authored-by: Julio César Rocha <JunielKatarn@users.noreply.github.com> * Upgrade projects to .NET 10 (#16226) * Upgrade projects to .NET 10 * Upgrade lock files * Change files * Remove nuget restore task * Re-introduce JS Desktop integration tests (#16228) * Remove redundant condition Desktop.IntegrationTests.SkipRNTester Modify Desktop.IntegrationTests.Filter instead. * Re-introduce WebSocket and WebSocketBlob tests * Make WSBlob test compare contents * Rename method to RunTest * Handle initial message from default endpoint * Change files * Migrate XHR test * Port Fetch test * Port Blob test * WebSocketMultipleSendTest * Remove JS WebSocket servers * Skip in CI for now * Add missing find-dotnet-tool entries * Update package locks * Fix DynamicReaderWriterTests * Fix HermesSamplingProfiler for MSVC 14.5 * Update package locks * Use WinRT coroutine types for UwpScriptStore --------- Co-authored-by: Copilot <copilot@github.com> Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> Co-authored-by: Gordon MacMaster <31481849+gmacmaster@users.noreply.github.com>

* Upgrade to PowerShell 7 (#16075) * Ran NuGetRestoreForceEvaluateAllSolutions.ps1 * Define installNuGetPackages task; Install pwsh 7.6.1 * Replace powershell.exe with pwsh.exe * Change files * CI: Ensure NuGet is availabe before `yarn install` * Add NuGetAuthenticate before yarn install * Do not download PowerShell on CI/CD environments * Fix just-task JS syntax * Add dotnet-tools manifest * Fix pwsh.exe tool path * Resolve dotnet-tools.json path * Use dotnet for `nuget locals` * Use PWSH in nuget-restore-task.js * Break dependency loop in just-task * Update other ADO tasks * Update @react-native-windows/automation * Rename findPwsh as findPowerShell * Drop powershell export from commandWithProgress * Change files * Add README for find-dotnet-tools * Add README to package.json * Adjust newline * Run task `installDotnetTools` only when not in CI * Install .NET tools in CI * Install .NET on prepare-js-env * Do not install .NET tools on CI * Quote powershell path * fix yarn lint * Ran NuGetRestoreForceEvaluateAllSolutions.ps1 * Restore deleted lock files * Add missing dependency * Use -Command for compatible PWSH calls * Use -Command pwsh argument * Correct runPowerShellScriptFunction cmd escaping * Quote pwsh command in runPowerShellScriptFunction * Remove quotes * Quote remaining findPowerShell() calls for execSync * Add temporary diagnostic commands * Diagnostics * Diagnostics * Diagnostics * Add runPowerShellScriptFunction argument to delegate Appx-related commands to Windows PowerShell * Remove diagnostics steps * Use execFileSync instead of execSync in deploy.ts * Remove querystrings from FS paths * Suppress warning when using `-UseWindowsPowerShell` * Revert "Remove querystrings from FS paths" This reverts commit e1f3cfd. * Use pipe semantics for Get-AppxPackage in resolveAppName * Hard-fail if PowerShell 7 cannot be found. Do not fall back to Windows PowerShell (powershell.exe). PowerShell code may not be backwards compatible. * Improve missing pwsh.exe error message * Add package resolution pipeline test * UseWindowsPowerShell for package resolution test * Try to read package Microsoft.PrintDialog * Replace stderr redirection with -WarningAction * Replace stderr redirection with -WarningAction * Print sample app names on appWindow error * Add more diagnostics * Add missing -WarningAction SilentlyContinue * Revert "Add more diagnostics" This reverts commit 8c10bc4. * Revert "Print sample app names on appWindow error" This reverts commit 6e70148. * Remove CI probing tasks * Revert "Use pipe semantics for Get-AppxPackage in resolveAppName" This reverts commit 6c46c73. Co-authored-by: Copilot <copilot@github.com> * Remove unused escaping logic * Re-introduce deleted .lock.json --------- Co-authored-by: Copilot <copilot@github.com> * Fix PowerShell installation (#16164) * Defer findPowershell to layoutMSRNCxx * Change files * Upgrade to Visual Studio 2026 (#16170) * Update deps script. TODO: test * Upgrade rnw-deps to .NET 10 * Defer findPowershell to layoutMSRNCxx * Upgrade VS version to 18.6.1 * Drop /async in MSVC 14.5 * Replace std::future coroutines with WinRT types * clang format * Change files * Drop Windows10SDK.19041 * Change files * Set TargetFramework to net10.0-windows10.0.26100.0 * Use IAsyncOperation instead of out parameters * Install .NET 10 * Revert "Install .NET 10" This reverts commit 5f75dc0. * Revert "Set TargetFramework to net10.0-windows10.0.26100.0" This reverts commit 22a4791. * clang format * Upgrade CsWinRT.csproj to .NET 8 * Fix filters * Upgrade MSRN SLN to VS 18 * Revert parameter signature in LoadBundleAsync * Update CSWinRT lock * Allow all versions of VS 2026 * Use IBuffer instead of hstring as payload GetJavaScriptFromServerAsync retuns bundle contents as hstring (16 bit) It then gets converted to an 8-bit string. This conversion drops bytes consideres "invalid". Those bytes are expected as part of the Hermes bundle header. Transmitting the bundle as an IBuffer preserves the original bytes and avoids the conversion issues. * Potential fix for pull request finding Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> * Use WinRT exception types instead of std --------- Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> * Upgrade to GoogleTest Adapter 1.8.1.8 (#16218) * Upgrade to GoogleTest adapter 1.8.1.8 * Change files * Update package lock files * Upgrade CI agents to Windows Server 2025 (#16208) * Use image rnw-img-vs2026-node24 * Update fork-sync/bin.js chmod * Upgrade to MSVC 14.5 * Drop -UseWindowsPowerShell fallback * Manually install yarn * Upgrade to .NET Hosting Bundle 10.0.8 * Change files * Fix change file * Add temp npm install yarn in templates * Test yarn location * update * update * TEMPORARILY revert agent image * Print yarn version in setup * Revert "TEMPORARILY revert agent image" This reverts commit 7c175e1. * update * update * update * Upgrade to msbuildVersion: 18.0 * Update Google test adapter location * Remove unused statement * Remove probing tasks * Upgrade to VSTest@3 * Upgrade more projects and scripts to VS 2026 * Explicitly set vstest.console location * Install midgard-yarn and verdaccio in-place * Fix yarn version * Update node-tests version * Use pwsh in Add-AppDevPackage * Make WindowsStoreAppUtils use PowerShell 7 * Update snapshot values * Update snapshot from failing x86 run * Use the --tag argument for verdaccio under Node 24 * Ignore/warn on unstable click test * Enable WMIC for RN Doctor * Disable RN doctor until it drops WMIC * Add rnw-img-vs2026-node24.json (#16224) * Update CI verdaccio to 6.7.2 (#16223) * Upgrade to Microsoft.WindowsAppSDK 1.8.260508005 (#16225) * Upgrade to Microsoft.WindowsAppSDK 1.8.260508005 * Change files * fix: WebSocket binaryType handling — stop unconditional Blob interception of binary messages (#16173) * blob support (#8) * blob support * pr comments * pr comments * Update DefaultBlobResource.cpp * Create react-native-windows-c3827e14-777b-475a-bf00-dc169bf89f3d.json * Add WebSocketArrayBuffer headless test (#9) * Add WebSocketArrayBuffer headless test * Skip test by default * pr comments * Update overrides (#10) --------- Co-authored-by: Julio César Rocha <JunielKatarn@users.noreply.github.com> * Upgrade projects to .NET 10 (#16226) * Upgrade projects to .NET 10 * Upgrade lock files * Change files * Update yarn lock * Re-introduce JS Desktop integration tests (#16228) * Remove redundant condition Desktop.IntegrationTests.SkipRNTester Modify Desktop.IntegrationTests.Filter instead. * Re-introduce WebSocket and WebSocketBlob tests * Make WSBlob test compare contents * Rename method to RunTest * Handle initial message from default endpoint * Change files * Migrate XHR test * Port Fetch test * Port Blob test * WebSocketMultipleSendTest * Remove JS WebSocket servers * Skip in CI for now * Update yarn lock * Remove ban-types * Fix DynamicReaderWriterTests * Use WinRT coroutine types for UwpScriptStore * clang format * yarn lint --------- Co-authored-by: Copilot <copilot@github.com> Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> Co-authored-by: Gordon MacMaster <31481849+gmacmaster@users.noreply.github.com>

Gordon MacMaster (gmacmaster) and others added 2 commits May 21, 2026 17:12

blob support (#8)

12ae4c0

* blob support * pr comments * pr comments * Update DefaultBlobResource.cpp

Create react-native-windows-c3827e14-777b-475a-bf00-dc169bf89f3d.json

ed898e9

Gordon MacMaster (gmacmaster) requested review from a team as code owners May 22, 2026 00:29

Gordon MacMaster (gmacmaster) added 2 commits May 22, 2026 11:13

Merge branch 'main' into vendora/fix-websockets

ba3935f

Merge branch 'main' into vendora/fix-websockets

9988150

Merge branch 'main' into vendora/fix-websockets

cc4bfe6

Julio César Rocha (JunielKatarn) mentioned this pull request May 31, 2026

Add WebSocketArrayBuffer headless test Virtual-Fulfillment-Technologies-Inc/react-native-windows#9

Merged

Julio César Rocha (JunielKatarn) requested changes May 31, 2026

View reviewed changes

Comment thread vnext/Shared/Modules/IWebSocketModuleContentHandler.h Outdated

Comment thread vnext/Shared/Modules/IWebSocketModuleContentHandler.h Outdated

Comment thread vnext/Shared/Modules/WebSocketModule.cpp

microsoft-github-policy-service Bot added the Needs: Author Feedback The issue/PR needs activity from its author (label drives bot activity) label May 31, 2026

Merge branch 'main' into vendora/fix-websockets

67350a0

microsoft-github-policy-service Bot removed the Needs: Author Feedback The issue/PR needs activity from its author (label drives bot activity) label Jun 1, 2026

Add WebSocketArrayBuffer headless test (#9)

9b08c38

* Add WebSocketArrayBuffer headless test * Skip test by default

Gordon MacMaster (gmacmaster) requested a review from a team as a code owner June 1, 2026 03:00

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Julio César Rocha (JunielKatarn) approved these changes Jun 2, 2026

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Update overrides (#10)

c081b7e

Merge branch 'main' into vendora/fix-websockets

10e1a54

Julio César Rocha (JunielKatarn) merged commit 5be8c05 into microsoft:main Jun 7, 2026
32 of 33 checks passed

Gordon MacMaster (gmacmaster) mentioned this pull request Jun 7, 2026

[84] fix: WebSocket binaryType handling — stop unconditional Blob interception of binary messages #16227

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Description

Type of Change

Why

What

Behavior after the fix:

Testing

Changelog

Microsoft Reviewers: Open in CodeFlow

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Julio César Rocha (JunielKatarn) commented May 22, 2026

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Gordon MacMaster (gmacmaster) commented May 27, 2026

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Julio César Rocha (JunielKatarn) commented May 31, 2026

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Julio César Rocha (JunielKatarn) commented May 31, 2026

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Performance Test Results

✅ Passed

SectionList

FlatList

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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Andrew Coates (acoates-ms) commented Jun 2, 2026

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Gordon MacMaster (gmacmaster) commented Jun 2, 2026

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Julio César Rocha (JunielKatarn) commented Jun 4, 2026

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Julio César Rocha (JunielKatarn) commented Jun 4, 2026

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Julio César Rocha (JunielKatarn) commented Jun 6, 2026

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Gordon MacMaster (gmacmaster) commented Jun 6, 2026

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Julio César Rocha (JunielKatarn) commented Jun 6, 2026

Gordon MacMaster (gmacmaster) commented May 22, 2026 •

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