The target "GenerateJSModuleManifestBuildStaticWebAssets" does not exist in the project.

[bwinklesky]

Describe the bug

After upgrading to v10 any RCL project using "UseMaui" in the project causes the vollwing error.

'C:\Users\brett.nuget\packages\microsoft.aspnetcore.components.webview\10.0.0\build\Microsoft.AspNetCore.Components.WebView.props(13,42): error MSB4057: The target "GenerateJSModuleManifestBuildStaticWebAssets" does not exist in the project.`

To Reproduce

Add this to any RCL (v10) Project.

<UseMaui>true</UseMaui>

Exceptions (if any)

• The IDE (VS / VS Code/ VS4Mac) you're running on, and its version

VS 2026 Insider

[danroth27]

@BethMassi @mattleibow FYI. I assume this impacts Blazor Hybrid?

[MackinnonBuck]

I'm not seeing this error on my own local repro.

@bwinklesky, could you provide us with a minimal repro project, hosted on GitHub as a public repository?

[bwinklesky]

I'm not seeing this error on my own local repro.

@bwinklesky, could you provide us with a minimal repro project, hosted on GitHub as a public repository?

@MackinnonBuck I'm using the following build prop because of another issue from v9.0 and long build times of RCL. The build works if JSModulesEnabled is true, but fails when it's false. It works fine with v9.0.

<Project>
  <PropertyGroup>
    <EnableSourceControlManagerQueries>true</EnableSourceControlManagerQueries>
  </PropertyGroup>
  <PropertyGroup>
   <JSModulesEnabled>false</JSModulesEnabled>
    <ScopedCssEnabled>false</ScopedCssEnabled>
    <CompressionEnabled>false</CompressionEnabled>
  </PropertyGroup>
</Project>

[halter73]

Does enabling JSModulesEnabled cause any issues for you in v10.0?

[bwinklesky]

Does enabling JSModulesEnabled cause any issues for you in v10.0?

@halter73 as stated in my previous comment, setting the prop to true works but fails when false if using v10.

[halter73]

Do you still have long build times if you keep JSModulesEnabled set to true in .NET 10? If it is still an issue in .NET 10, can you please provide a minimal repro project? Preferably, this should be hosted as a GitHub repo.

[bwinklesky]

Do you still have long build times if you keep JSModulesEnabled set to true in .NET 10? If it is still an issue in .NET 10, can you please provide a minimal repro project? Preferably, this should be hosted as a GitHub repo.

@halter73 there was another ticket we reported for v9 and reported back that build times we're still long using v10.

I don't have time right now to provide a repo, but yes, it still has long build times in v10 for SWA in an RCL.

[bwinklesky]

@halter73 @MackinnonBuck Any update on this? Why does setting JSModulesEnabled to false cause the error?

[bwinklesky]

Do you still have long build times if you keep JSModulesEnabled set to true in .NET 10? If it is still an issue in .NET 10, can you please provide a minimal repro project? Preferably, this should be hosted as a GitHub repo.

@halter73 I don't understand why you want to need a repo for this issue. It seem like the 'bug' is that it fails when JSModulesEnabled is false, not because of the long build time. This prop was recommended in the "resolution" of this issue:

dotnet/aspnetcore#59129

dotnet/aspnetcore#59129 (comment)

You can use the repo that was attached to the issue above if you feel like it will help, but it seems like this issue is a regression. It worked fine for Javier using 10.0 RC1.

[bwinklesky]

@halter73 @MackinnonBuck

Any updates on this?