[wasm] `Wasm.Build.Tests` failing with `Generator 'JSExportGenerator' failed to initialize`.. `FileNotFoundException`.. `Microsoft.Interop.SourceGeneration`

[radical]

Wasm.Build.Tests.WasmTemplateTests failing on multiple PRs. On #74704 it failed with:

/datadisks/disk1/work/ABD10942/w/B5030994/e/dotnet-workload/sdk/7.0.100-rc.2.22426.5/MSBuild.dll /nologo -maxcpucount -property:_IsPublishing=true --property:WasmBuildOnlyAfterPublish=true --property:AppRefDir=/datadisks/disk1/work/ABD10942/p/microsoft.netcore.app.ref --property:Configuration=Debug -restore -target:Publish -verbosity:m /v:minimal /bl:/datadisks/disk1/work/ABD10942/w/B5030994/uploads/xharness-output/logs/Debug_rgbarhvz.zdp/Debug_rgbarhvz.zdp.binlog ./Debug_rgbarhvz.zdp.csproj
  Determining projects to restore...
  Restored /datadisks/disk1/work/ABD10942/w/B5030994/e/Debug_rgbarhvz.zdp/Debug_rgbarhvz.zdp.csproj (in 4 ms).

CSC : warning CS8784: Generator 'JSExportGenerator' failed to initialize. It will not contribute to the output and compilation errors may occur as a result.
	Exception was of type 'FileNotFoundException' with message 'Could not load file or assembly
		'Microsoft.Interop.SourceGeneration, Version=42.42.42.42, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. The system cannot find the file specified. [/datadisks/disk1/work/ABD10942/w/B5030994/e/Debug_rgbarhvz.zdp/Debug_rgbarhvz.zdp.csproj]
CSC : warning CS8784: Generator 'JSImportGenerator' failed to initialize. It will not contribute to the output and compilation errors may occur as a result.
	Exception was of type 'FileNotFoundException' with message 'Could not load file or assembly
		'Microsoft.Interop.SourceGeneration, Version=42.42.42.42, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. The system cannot find the file specified. [/datadisks/disk1/work/ABD10942/w/B5030994/e/Debug_rgbarhvz.zdp/Debug_rgbarhvz.zdp.csproj]
CSC : warning CS8784: Generator 'LibraryImportGenerator' failed to initialize. It will not contribute to the output and compilation errors may occur as a result.
	Exception was of type 'FileNotFoundException' with message 'Could not load file or assembly
		'Microsoft.Interop.SourceGeneration, Version=42.42.42.42, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. The system cannot find the file specified. [/datadisks/disk1/work/ABD10942/w/B5030994/e/Debug_rgbarhvz.zdp/Debug_rgbarhvz.zdp.csproj]

/datadisks/disk1/work/ABD10942/w/B5030994/e/Debug_rgbarhvz.zdp/Program.cs(21,36):
	error CS8795: Partial method 'MyClass.GetNodeVersion()' must have an implementation part because it has accessibility modifiers. [/datadisks/disk1/work/ABD10942/w/B5030994/e/Debug_rgbarhvz.zdp/Debug_rgbarhvz.zdp.csproj]

Also seen on #74705 .

cc @maraf @pavelsavara

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Issue Details

---

Wasm.Build.Tests failing on multiple PRs. On #74704 it failed with:

/datadisks/disk1/work/ABD10942/w/B5030994/e/dotnet-workload/sdk/7.0.100-rc.2.22426.5/MSBuild.dll /nologo -maxcpucount -property:_IsPublishing=true --property:WasmBuildOnlyAfterPublish=true --property:AppRefDir=/datadisks/disk1/work/ABD10942/p/microsoft.netcore.app.ref --property:Configuration=Debug -restore -target:Publish -verbosity:m /v:minimal /bl:/datadisks/disk1/work/ABD10942/w/B5030994/uploads/xharness-output/logs/Debug_rgbarhvz.zdp/Debug_rgbarhvz.zdp.binlog ./Debug_rgbarhvz.zdp.csproj
  Determining projects to restore...
  Restored /datadisks/disk1/work/ABD10942/w/B5030994/e/Debug_rgbarhvz.zdp/Debug_rgbarhvz.zdp.csproj (in 4 ms).

/datadisks/disk1/work/ABD10942/w/B5030994/e/dotnet-workload/sdk/7.0.100-rc.2.22426.5/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.RuntimeIdentifierInference.targets(219,5): message NETSDK1057: You are using a preview version of .NET. See: https://aka.ms/dotnet-support-policy [/datadisks/disk1/work/ABD10942/w/B5030994/e/Debug_rgbarhvz.zdp/Debug_rgbarhvz.zdp.csproj]

CSC : warning CS8784: Generator 'JSExportGenerator' failed to initialize. It will not contribute to the output and compilation errors may occur as a result.
	Exception was of type 'FileNotFoundException' with message 'Could not load file or assembly
		'Microsoft.Interop.SourceGeneration, Version=42.42.42.42, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. The system cannot find the file specified. [/datadisks/disk1/work/ABD10942/w/B5030994/e/Debug_rgbarhvz.zdp/Debug_rgbarhvz.zdp.csproj]
CSC : warning CS8784: Generator 'JSImportGenerator' failed to initialize. It will not contribute to the output and compilation errors may occur as a result.
	Exception was of type 'FileNotFoundException' with message 'Could not load file or assembly
		'Microsoft.Interop.SourceGeneration, Version=42.42.42.42, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. The system cannot find the file specified. [/datadisks/disk1/work/ABD10942/w/B5030994/e/Debug_rgbarhvz.zdp/Debug_rgbarhvz.zdp.csproj]
CSC : warning CS8784: Generator 'LibraryImportGenerator' failed to initialize. It will not contribute to the output and compilation errors may occur as a result.
	Exception was of type 'FileNotFoundException' with message 'Could not load file or assembly
		'Microsoft.Interop.SourceGeneration, Version=42.42.42.42, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. The system cannot find the file specified. [/datadisks/disk1/work/ABD10942/w/B5030994/e/Debug_rgbarhvz.zdp/Debug_rgbarhvz.zdp.csproj]

/datadisks/disk1/work/ABD10942/w/B5030994/e/Debug_rgbarhvz.zdp/Program.cs(21,36): error CS8795: Partial method 'MyClass.GetNodeVersion()' must have an implementation part because it has accessibility modifiers. [/datadisks/disk1/work/ABD10942/w/B5030994/e/Debug_rgbarhvz.zdp/Debug_rgbarhvz.zdp.csproj]

Also seen on #74705 .

cc @maraf @pavelsavara

Author:	radical
Assignees:	-
Labels:	arch-wasm, blocking-clean-ci, area-System.Runtime.InteropServices.JavaScript, test-failure
Milestone:	-

[radical]

@ericstj could this be related to #74897 ? This is a wasm template project being built with a rc2 sdk, and wasm-tools workload installed.

This is effectively what's being run:

1. dotnet new wasmconsole
2. dotnet publish -p:WasmBuildOnlyAfterPublish=true /p:AppRefDir=/datadisks/disk1/work/ABD10942/p/microsoft.netcore.app.ref /p:Configuration=Debug /nologo /v:minimal

[ericstj]

Yes, you need #74943