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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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15 changes: 4 additions & 11 deletions .../HotReloadAgent.WebAssembly.Browser/Microsoft.DotNet.HotReload.WebAssembly.Browser.csproj
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Original file line number Diff line number Diff line change
@@ -1,26 +1,19 @@
<Project Sdk="Microsoft.NET.Sdk.Razor">
<Project Sdk="Microsoft.NET.Sdk">

<PropertyGroup>
<TargetFramework>$(SdkTargetFramework)</TargetFramework>
<TargetFramework>net10.0</TargetFramework>
<GenerateDocumentationFile>false</GenerateDocumentationFile>
<GenerateDependencyFile>false</GenerateDependencyFile>
<LangVersion>preview</LangVersion>
<AllowUnsafeBlocks>true</AllowUnsafeBlocks>

<!-- NuGet -->
<IsPackable>true</IsPackable>
<IsShipping>true</IsShipping>
<IsShippingPackage>true</IsShippingPackage>
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<PackageId>Microsoft.DotNet.HotReload.WebAssembly.Browser</PackageId>
<Description>HotReload package for WebAssembly</Description>
<!-- Remove once https://github.com/NuGet/Home/issues/8583 is fixed -->
<NoWarn>$(NoWarn);NU5128</NoWarn>
</PropertyGroup>

<Import Project="..\HotReloadAgent\Microsoft.DotNet.HotReload.Agent.projitems" Label="Shared" />
<Import Project="..\HotReloadAgent.Data\Microsoft.DotNet.HotReload.Agent.Data.projitems" Label="Shared" />

<ItemGroup>
<Content Include="wwwroot\**\*.*" CopyToOutputDirectory="PreserveNewest" />
<InternalsVisibleTo Include="DynamicProxyGenAssembly2" Key="$(MoqPublicKey)" />
</ItemGroup>

</Project>
43 changes: 39 additions & 4 deletions src/WasmSdk/Sdk/Sdk.targets
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Expand Up @@ -16,15 +16,50 @@ Copyright (c) .NET Foundation. All rights reserved.
<Import Sdk="Microsoft.NET.Sdk" Project="Sdk.targets" Condition="'$(RuntimeIdentifier)' == 'wasi-wasm' and '$(_WasmSdkImportsMicrosoftNetSdk)' == 'true'" />

<PropertyGroup>
<!-- Implicit HotReload package reference for .NET 10+ if not explicitly turned off -->
<_WasmEnableHotReload>$(WasmEnableHotReload)</_WasmEnableHotReload>
<_WasmEnableHotReload Condition="'$(_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="_WasmImplicitlyReferenceHotReload" BeforeTargets="ResolveProjectStaticWebAssets" AfterTargets="ResolveStaticWebAssetsConfiguration" Condition="'$(_WasmEnableHotReload)' == 'true'">
<PropertyGroup>
<_WasmHotReloadTfm Condition="$([MSBuild]::VersionGreaterThanOrEquals('$(TargetFrameworkVersion)', '10.0'))">net10.0</_WasmHotReloadTfm>
<_WasmHotReloadPath Condition="'$(_WasmHotReloadTfm)' != ''">$([MSBuild]::NormalizeDirectory($(MSBuildThisFileDirectory), '..', 'hotreload', $(_WasmHotReloadTfm)))</_WasmHotReloadPath>
</PropertyGroup>
<ItemGroup Condition="'$(_WasmHotReloadPath)' != ''">
<ReferenceCopyLocalPaths Include="$(_WasmHotReloadPath)\Microsoft.DotNet.HotReload.WebAssembly.Browser.dll">
<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
<CopyToPublishDirectory>Never</CopyToPublishDirectory>
</ReferenceCopyLocalPaths>
<_WasmHotReloadModule Include="$(_WasmHotReloadPath)\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="$(_WasmHotReloadPath)\wwwroot\"
BasePath="$(StaticWebAssetBasePath)"
AssetKind="Build"
AssetTraitName="JSModule"
AssetTraitValue="JSLibraryModule"
PropertyOverrides="AssetTraitName;AssetTraitValue"
Condition="'$(_WasmHotReloadPath)' != ''">
<Output TaskParameter="Assets" ItemName="StaticWebAsset" />
<Output TaskParameter="Assets" ItemName="_WasmHotReloadModuleStaticWebAsset" />
</DefineStaticWebAssets>
<DefineStaticWebAssetEndpoints
CandidateAssets="@(_WasmHotReloadModuleStaticWebAsset)"
ContentTypeMappings="@(StaticWebAssetContentTypeMapping)"
Condition="'$(_WasmHotReloadPath)' != ''">
<Output TaskParameter="Endpoints" ItemName="StaticWebAssetEndpoint" />
</DefineStaticWebAssetEndpoints>
</Target>

<Import Sdk="Microsoft.NET.Sdk.Publish" Project="Sdk.targets" Condition="'$(_WasmSdkImportsMicrosoftNETSdkPublish)' == 'true'" />
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16 changes: 10 additions & 6 deletions src/WasmSdk/Tasks/Microsoft.NET.Sdk.WebAssembly.Tasks.csproj
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
<Project>
<Project>

<PropertyGroup>
<WasmSdkRoot>$(RepoRoot)\src\WasmSdk\</WasmSdkRoot>
Expand Down Expand Up @@ -35,18 +35,22 @@
</PropertyGroup>

<PropertyGroup>
<TargetFrameworks>$(SdkTargetFramework);net472</TargetFrameworks>
<!-- We are not using the assembly anywhere -->
<TargetFrameworks>$(SdkTargetFramework)</TargetFrameworks>

@tmat tmat Jan 30, 2026

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Shouldn't this be TargetFramework (singular)?

@maraf maraf Jan 30, 2026

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Hmm. For some reason it doesn't produce a correct layout - the output SDK folder contains just the dll

</PropertyGroup>

<ItemGroup>
<AdditionalContent Include="$(WasmSdkRoot)targets\**\*.*">
<Pack>true</Pack>
<PackagePath>targets</PackagePath>
</AdditionalContent>
<ProjectReference Include="..\..\BuiltInTools\HotReloadAgent.WebAssembly.Browser\Microsoft.DotNet.HotReload.WebAssembly.Browser.csproj">

@tmat tmat Jan 30, 2026

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I think setting metadata of the ProjectReference like so and removing the <AdditionalContent> below would work

      <OutputItemType>AdditionalContent</OutputItemType>
      <ReferenceOutputAssembly>false</ReferenceOutputAssembly>           
      <Pack>true</Pack>
      <PackagePath>hotreload</PackagePath>

@maraf maraf Jan 30, 2026

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It add items to the AdditionalContent, but the PackagePath metadata is ignored
image

<Private>false</Private>
</ProjectReference>
<AdditionalContent Include="$(WasmSdkRoot)Sdk\**\*.*">
<Pack>true</Pack>
<PackagePath>Sdk</PackagePath>
</AdditionalContent>
<AdditionalContent Include="$(ArtifactsBinDir)\Microsoft.DotNet.HotReload.WebAssembly.Browser\$(Configuration)\**\*.*">
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<Pack>true</Pack>
<PackagePath>hotreload</PackagePath>
</AdditionalContent>
</ItemGroup>

<Target Name="PrepareAdditionalFilesToLayout" BeforeTargets="AssignTargetPaths">
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