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[wasm] Embed HotReload in WebAssembly SDK #52710

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maraf wants to merge 19 commits into from
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[wasm] Embed HotReload in WebAssembly SDK #52710

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7ec7aa6
Fix test assets
maraf Jan 19, 2026
415a97b
Remove dependency on Package for running tests
maraf Jan 21, 2026
1d61ff1
Embed HotReload in WasmSDK
maraf Jan 28, 2026
c777ede
Reference embedded HotReload
maraf Jan 28, 2026
366479c
Define SWA for JSInitializer
maraf Jan 28, 2026
43ca45c
Fix content root
maraf Jan 29, 2026
9b27e95
Don't pack the package
maraf Jan 29, 2026
0b699ca
More properties
maraf Jan 29, 2026
a5c04c4
Feedback
maraf Jan 30, 2026
db3697d
Copy JS part through project reference
maraf Jan 30, 2026
724f7f0
Fix
maraf Jan 30, 2026
438b349
ProjectReference with manual asset copy
maraf Jan 30, 2026
d1eb14f
Fix
maraf Jan 30, 2026
b0b6233
Fix
maraf Jan 30, 2026
d7a29f0
Refactor
maraf Jan 30, 2026
c8bb76b
Baselines
maraf Jan 30, 2026
66273f1
Merge branch 'main' into maraf/WasmHotReloadEmbed
maraf Jan 30, 2026
09dcf66
Don't add .nuget as package source
maraf Jan 30, 2026
a16649e
Fix double slash
maraf Jan 30, 2026
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2 changes: 0 additions & 2 deletions .../HotReloadAgent.WebAssembly.Browser/Microsoft.DotNet.HotReload.WebAssembly.Browser.csproj
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Expand Up @@ -8,9 +8,7 @@
<AllowUnsafeBlocks>true</AllowUnsafeBlocks>

<!-- NuGet -->
<IsPackable>true</IsPackable>
<IsShipping>true</IsShipping>
<IsShippingPackage>true</IsShippingPackage>
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maraf marked this conversation as resolved.
<PackageId>Microsoft.DotNet.HotReload.WebAssembly.Browser</PackageId>
<Description>HotReload package for WebAssembly</Description>
<!-- Remove once https://github.com/NuGet/Home/issues/8583 is fixed -->
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42 changes: 39 additions & 3 deletions src/WasmSdk/Sdk/Sdk.targets
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Expand Up @@ -21,10 +21,46 @@ Copyright (c) .NET Foundation. All rights reserved.
<_WasmEnableHotReload Condition="'$(_WasmEnableHotReload)' == '' and '$(Configuration)' != 'Debug'">false</_WasmEnableHotReload>
<_WasmEnableHotReload Condition="'$(_WasmEnableHotReload)' == '' and '$(TargetFrameworkIdentifier)' == '.NETCoreApp' and $([MSBuild]::VersionGreaterThanOrEquals('$(TargetFrameworkVersion)', '10.0'))">true</_WasmEnableHotReload>
</PropertyGroup>
<Target Name="_ImplicitlyReferenceHotReload" BeforeTargets="ProcessFrameworkReferences">
<ItemGroup Condition="'$(_WasmEnableHotReload)' == 'true'">
<PackageReference Include="Microsoft.DotNet.HotReload.WebAssembly.Browser" Version="$(NETCoreSdkVersion)" IsImplicitlyDefined="true" />
<Target Name="_ImplicitlyReferenceHotReload" BeforeTargets="ResolveProjectStaticWebAssets" AfterTargets="ResolveStaticWebAssetsConfiguration" Condition="'$(_WasmEnableHotReload)' == 'true'">
<PropertyGroup>
<_WasmHotReloadRoot>$([MSBuild]::NormalizeDirectory($(MSBuildThisFileDirectory), '..', 'hotreload'))</_WasmHotReloadRoot>
<_WasmHotReloadDllPath Condition="$([MSBuild]::VersionGreaterThanOrEquals('$(TargetFrameworkVersion)', '10.0'))">net10.0</_WasmHotReloadDllPath>

@maraf maraf Jan 29, 2026

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@tmat Do you prefer to multi-target the dll or pin it to .NET 10?

@tmat tmat Jan 29, 2026

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Let's pin to .NET 10 until we need runtime features that need higher version. It's simpler and reduces SDK size.

@tmat tmat Jan 29, 2026

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Also, let's target release/10.0.3xx branch instead of main.

@maraf maraf Jan 30, 2026

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I would rather land it on main and backport it to 10. We are testing some scenarios only on main in runtime and I have some unpleasant memories when changes arrived there later due to delayed forward flow in SDK

<_WasmHotReloadDllPath Condition="$([MSBuild]::VersionGreaterThanOrEquals('$(TargetFrameworkVersion)', '11.0'))">net11.0</_WasmHotReloadDllPath>
</PropertyGroup>
<ItemGroup Condition="'$(_WasmHotReloadDllPath)' != ''">
<ReferenceCopyLocalPaths Include="$(_WasmHotReloadRoot)\$(_WasmHotReloadDllPath)\Microsoft.DotNet.HotReload.WebAssembly.Browser.dll">
<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
<CopyToPublishDirectory>Never</CopyToPublishDirectory>
</ReferenceCopyLocalPaths>
<_WasmHotReloadModule Include="$(_WasmHotReloadRoot)\wwwroot\Microsoft.DotNet.HotReload.WebAssembly.Browser.lib.module.js">
<TargetPath>_framework\Microsoft.DotNet.HotReload.WebAssembly.Browser.lib.module.js</TargetPath>
<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
<CopyToPublishDirectory>Never</CopyToPublishDirectory>
</_WasmHotReloadModule>
<_WasmHotReloadModule OriginalItemSpec="%(Identity)" />
</ItemGroup>

<DefineStaticWebAssets
CandidateAssets="@(_WasmHotReloadModule)"
FingerprintCandidates="$(StaticWebAssetsFingerprintContent)"
FingerprintPatterns="@(StaticWebAssetFingerprintPattern)"
SourceId="$(PackageId)"
SourceType="Computed"
ContentRoot="$(_WasmHotReloadRoot)\wwwroot\"
BasePath="$(StaticWebAssetBasePath)"
AssetKind="Build"
AssetTraitName="JSModule"
AssetTraitValue="JSLibraryModule"
PropertyOverrides="AssetTraitName;AssetTraitValue">
<Output TaskParameter="Assets" ItemName="StaticWebAsset" />
<Output TaskParameter="Assets" ItemName="_WasmHotReloadModuleStaticWebAsset" />
</DefineStaticWebAssets>
<DefineStaticWebAssetEndpoints
CandidateAssets="@(_WasmHotReloadModuleStaticWebAsset)"
ContentTypeMappings="@(StaticWebAssetContentTypeMapping)"
>
<Output TaskParameter="Endpoints" ItemName="StaticWebAssetEndpoint" />
</DefineStaticWebAssetEndpoints>
</Target>

<Import Sdk="Microsoft.NET.Sdk.Publish" Project="Sdk.targets" Condition="'$(_WasmSdkImportsMicrosoftNETSdkPublish)' == 'true'" />
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8 changes: 8 additions & 0 deletions src/WasmSdk/Tasks/Microsoft.NET.Sdk.WebAssembly.Tasks.csproj
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Expand Up @@ -47,6 +47,14 @@
<Pack>true</Pack>
<PackagePath>Sdk</PackagePath>
</AdditionalContent>
<AdditionalContent Include="$(ArtifactsBinDir)\Microsoft.DotNet.HotReload.WebAssembly.Browser\$(Configuration)\**\*.*">
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<Pack>true</Pack>
<PackagePath>hotreload</PackagePath>
</AdditionalContent>
<AdditionalContent Include="$(SdkSrcRoot)\BuiltInTools\HotReloadAgent.WebAssembly.Browser\wwwroot\**\*.*">
<Pack>true</Pack>
<PackagePath>hotreload\wwwroot</PackagePath>
</AdditionalContent>
</ItemGroup>

<Target Name="PrepareAdditionalFilesToLayout" BeforeTargets="AssignTargetPaths">
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2 changes: 1 addition & 1 deletion test/TestAssets/TestProjects/WatchBlazorWasm/Properties/launchSettings.json
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Expand Up @@ -2,7 +2,7 @@
"profiles": {
"http": {
"commandName": "Project",
"dotnetRunMessages": "true",
"dotnetRunMessages": true,
"launchBrowser": true,
"applicationUrl": "http://localhost:5000",
"environmentVariables": {
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2 changes: 1 addition & 1 deletion ...TestAssets/TestProjects/WatchBlazorWasmHosted/blazorhosted/Properties/launchSettings.json
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Expand Up @@ -2,7 +2,7 @@
"profiles": {
"http": {
"commandName": "Project",
"dotnetRunMessages": "true",
"dotnetRunMessages": true,
"launchBrowser": true,
"applicationUrl": "http://localhost:5000",
"environmentVariables": {
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6 changes: 0 additions & 6 deletions test/UnitTests.proj
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Expand Up @@ -138,7 +138,6 @@
<MSBuildSdkResolverDir>$(RepoRoot)artifacts\bin\Microsoft.DotNet.MSBuildSdkResolver</MSBuildSdkResolverDir>
<HelixStage0Targz>$(RepoRoot)artifacts\tmp\HelixStage0.tar.gz</HelixStage0Targz>
<MicrosoftNETBuildExtensions>$(RepoRoot)artifacts\bin\$(Configuration)\Sdks\Microsoft.NET.Build.Extensions</MicrosoftNETBuildExtensions>
<ArtifactsShippingPackages>$(RepoRoot)artifacts\packages\$(Configuration)\Shipping</ArtifactsShippingPackages>
</PropertyGroup>

<TarGzFileCreateFromDirectory
Expand Down Expand Up @@ -183,11 +182,6 @@
<Destination>d/.nuget</Destination>
<Uri>https://netcorenativeassets.blob.core.windows.net/resource-packages/external/any/sdk-test-assets/SDKTestRunPackages2.zip</Uri>
</HelixCorrelationPayload>

<HelixCorrelationPayload Include="$(ArtifactsShippingPackages)">
<PayloadDirectory>$(ArtifactsShippingPackages)</PayloadDirectory>
<Destination>d/.nuget</Destination>
</HelixCorrelationPayload>
</ItemGroup>
</Target>

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