[coreclr] appsettings.json is Not Bundled in CoreCLR WASM

Reproduction:
Run Wasm.Build.Tests.AppSettingsTests (currently disabled in eng/testing/scenarios/BuildWasmAppsJobsListCLR.txt)

Error:

Collection: ["'/appsettings.json' exists 'False'", "'/appsettings.Development.json' exists 'False'", "'/appsettings.Production.json' exists 'False'"] Stack Trace: C:\Users\itomkowicz\repros\runtime2\src\mono\wasm\Wasm.Build.Tests\AppSettingsTests.cs(74,0): at Wasm.Build.Tests.AppSettingsTests.LoadAppSettingsBasedOnApplicationEnvironment(Boolean publish, String msBuildApplicationEnvironment, String queryApplicationEnvironment, String expectedApplicationEnvironment) at System.Runtime.CompilerServices.AsyncHelpers.RuntimeAsyncTask`1.DispatchContinuations()

Details

Wasm.Build.Tests.AppSettingsTests.LoadAppSettingsBasedOnApplicationEnvironment(publish: False, msBuildApplicationEnvironment: null, queryApplicationEnvironment: null, expectedApplicationEnvironment: "Development") [FAIL] Assert.Contains() Failure: Filter not matched in collection Collection: ["'/appsettings.json' exists 'False'", "'/appsettings.Development.json' exists 'False'", "'/appsettings.Production.json' exists 'False'"] Stack Trace: C:\Users\itomkowicz\repros\runtime2\src\mono\wasm\Wasm.Build.Tests\AppSettingsTests.cs(74,0): at Wasm.Build.Tests.AppSettingsTests.LoadAppSettingsBasedOnApplicationEnvironment(Boolean publish, String msBuildApplicationEnvironment, String queryApplicationEnvironment, String expectedApplicationEnvironment) at System.Runtime.CompilerServices.AsyncHelpers.RuntimeAsyncTask`1.DispatchContinuations() --- End of stack trace from previous location --- --- End of stack trace from previous location --- Output:

      ** -------- build -------- **
      
      Binlog path: C:\Users\itomkowicz\repros\runtime2\artifacts\bin\Wasm.Build.Tests\Release\net11.0\win-x64\xharness-output\logs\AppSettingsTest_Debug_False_ykaz0bkj_5zt\WasmBasicTestApp-build.binlog
      [] Executing (Captured Output) - C:\Users\itomkowicz\repros\runtime2\artifacts\bin\dotnet-none\dotnet.exe build -bl:C:\Users\itomkowicz\repros\runtime2\artifacts\bin\Wasm.Build.Tests\Release\net11.0\win-x64\xharness-output\logs\AppSettingsTest_Debug_False_ykaz0bkj_5zt\WasmBasicTestApp-build.binlog -p:Configuration=Debug -nr:false -p:WasmEnableHotReload=false   -  in pwd C:\Users\itomkowicz\repros\runtime2\artifacts\bin\Wasm.Build.Tests\Release\net11.0\win-x64\wbt artifacts\AppSettingsTest_Debug_False_ykaz0bkj_5zt\App
      	[DOTNET_ROOT] = C:\Users\itomkowicz\repros\runtime2\artifacts\bin\dotnet-none
      	[DOTNET_INSTALL_DIR] = C:\Users\itomkowicz\repros\runtime2\artifacts\bin\dotnet-none
      	[DOTNET_SKIP_FIRST_TIME_EXPERIENCE] = 1
      	[PATH] = C:\Users\itomkowicz\repros\runtime2\artifacts\bin\dotnet-none;C:\Users\itomkowicz\repros\runtime2\.dotnet;C:\Program Files\PowerShell\7;c:\Users\itomkowicz\AppData\Roaming\Code\User\globalStorage\github.copilot-chat\debugCommand;c:\Users\itomkowicz\AppData\Roaming\Code\User\globalStorage\github.copilot-chat\copilotCli;C:\Program Files (x86)\Microsoft SDKs\Azure\CLI2\wbin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\System32\OpenSSH\;C:\Program Files\Azure Dev CLI;C:\Program Files\GitHub CLI\;C:\Users\vmadmin\AppData\Local\Microsoft\WindowsApps;C:\Program Files\Microsoft SQL Server\150\Tools\Binn\;C:\.tools\dotnet;C:\.tools\.npm-global;C:\Users\vmadmin\.dotnet\tools;C:\Program Files\NuGet;C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\WindowsApps;C:\Program Files\Microsoft Dev Box Agent\Scripts;C:\Program Files\dotnet\;C:\Program Files\CMake\bin;C:\Program Files\nodejs\;C:\Program Files\PowerShell\7\;C:\Program Files (x86)\Windows Kits\10\Windows Performance Toolkit\;C:\Program Files\Microsoft SQL Server\170\Tools\Binn\;C:\Program Files\Microsoft SQL Server\Client SDK\ODBC\170\Tools\Binn\;C:\Program Files\Git\cmd;C:\Program Files\Docker\Docker\resources\bin;C:\Users\itomkowicz\AppData\Local\Programs\Python\Python311\Scripts\;C:\Users\itomkowicz\AppData\Local\Programs\Python\Python311\;C:\Users\itomkowicz\AppData\Local\Microsoft\WindowsApps;C:\Program Files\ninja;C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python39_64;C:\Users\itomkowicz\AppData\Local\Programs\Microsoft VS Code\bin;C:\Program Files\v8;C:\Users\itomkowicz\AppData\Local\Microsoft\WinGet\Links;C:\Users\itomkowicz\AppData\Roaming\npm;C:\Users\itomkowicz\.dotnet\tools
      	[EM_WORKAROUND_PYTHON_BUG_34780] = 1
      	[WasmEnableWebCil] = false
      	[WasmTestSupport] = true
      	[WasmTestExitOnUnhandledError] = true
      	[WasmTestLogExitCode] = true
      	[NUGET_PACKAGES] = C:\Users\itomkowicz\repros\runtime2\artifacts\bin\Wasm.Build.Tests\Release\net11.0\win-x64\wbt artifacts\nuget\AppSettingsTest_Debug_False_ykaz0bkj_5zt
      	[TreatPreviousAsCurrent] = false
      [] 
      []   Determining projects to restore...
      []   Restored C:\Users\itomkowicz\repros\runtime2\artifacts\bin\Wasm.Build.Tests\Release\net11.0\win-x64\wbt artifacts\AppSettingsTest_Debug_False_ykaz0bkj_5zt\LazyLibrary\LazyLibrary.csproj (in 195 ms).
      []   Restored C:\Users\itomkowicz\repros\runtime2\artifacts\bin\Wasm.Build.Tests\Release\net11.0\win-x64\wbt artifacts\AppSettingsTest_Debug_False_ykaz0bkj_5zt\Json\Json.csproj (in 195 ms).
      []   Restored C:\Users\itomkowicz\repros\runtime2\artifacts\bin\Wasm.Build.Tests\Release\net11.0\win-x64\wbt artifacts\AppSettingsTest_Debug_False_ykaz0bkj_5zt\ResourceLibrary\ResourceLibrary.csproj (in 195 ms).
      []   Restored C:\Users\itomkowicz\repros\runtime2\artifacts\bin\Wasm.Build.Tests\Release\net11.0\win-x64\wbt artifacts\AppSettingsTest_Debug_False_ykaz0bkj_5zt\App\WasmBasicTestApp.csproj (in 4.83 sec).
      [] C:\Users\itomkowicz\repros\runtime2\artifacts\bin\dotnet-none\sdk\11.0.100-preview.3.26124.102\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.RuntimeIdentifierInference.targets(383,5): message NETSDK1057: You are using a preview version of .NET. See: https://aka.ms/dotnet-support-policy [C:\Users\itomkowicz\repros\runtime2\artifacts\bin\Wasm.Build.Tests\Release\net11.0\win-x64\wbt artifacts\AppSettingsTest_Debug_False_ykaz0bkj_5zt\App\WasmBasicTestApp.csproj]
      [] C:\Users\itomkowicz\repros\runtime2\artifacts\bin\dotnet-none\sdk\11.0.100-preview.3.26124.102\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.RuntimeIdentifierInference.targets(383,5): message NETSDK1057: You are using a preview version of .NET. See: https://aka.ms/dotnet-support-policy [C:\Users\itomkowicz\repros\runtime2\artifacts\bin\Wasm.Build.Tests\Release\net11.0\win-x64\wbt artifacts\AppSettingsTest_Debug_False_ykaz0bkj_5zt\LazyLibrary\LazyLibrary.csproj]
      [] C:\Users\itomkowicz\repros\runtime2\artifacts\bin\dotnet-none\sdk\11.0.100-preview.3.26124.102\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.RuntimeIdentifierInference.targets(383,5): message NETSDK1057: You are using a preview version of .NET. See: https://aka.ms/dotnet-support-policy [C:\Users\itomkowicz\repros\runtime2\artifacts\bin\Wasm.Build.Tests\Release\net11.0\win-x64\wbt artifacts\AppSettingsTest_Debug_False_ykaz0bkj_5zt\Json\Json.csproj]
      []   Json -> C:\Users\itomkowicz\repros\runtime2\artifacts\bin\Wasm.Build.Tests\Release\net11.0\win-x64\wbt artifacts\AppSettingsTest_Debug_False_ykaz0bkj_5zt\Json\bin\Debug\net11.0\Json.dll
      []   LazyLibrary -> C:\Users\itomkowicz\repros\runtime2\artifacts\bin\Wasm.Build.Tests\Release\net11.0\win-x64\wbt artifacts\AppSettingsTest_Debug_False_ykaz0bkj_5zt\LazyLibrary\bin\Debug\net11.0\browser-wasm\LazyLibrary.dll
      []   ResourceLibrary -> C:\Users\itomkowicz\repros\runtime2\artifacts\bin\Wasm.Build.Tests\Release\net11.0\win-x64\wbt artifacts\AppSettingsTest_Debug_False_ykaz0bkj_5zt\ResourceLibrary\bin\Debug\net11.0\ResourceLibrary.dll
      []   WasmBasicTestApp -> C:\Users\itomkowicz\repros\runtime2\artifacts\bin\Wasm.Build.Tests\Release\net11.0\win-x64\wbt artifacts\AppSettingsTest_Debug_False_ykaz0bkj_5zt\App\bin\Debug\net11.0\WasmBasicTestApp.dll
      []   ** MicrosoftNetCoreAppRuntimePackDir : 'C:\Users\itomkowicz\repros\runtime2\artifacts\bin\Wasm.Build.Tests\Release\net11.0\win-x64\wbt artifacts\nuget\AppSettingsTest_Debug_False_ykaz0bkj_5zt\microsoft.netcore.app.runtime.browser-wasm\11.0.0-dev'
      [] 
      [] Build succeeded.
      []     0 Warning(s)
      []     0 Error(s)
      [] 
      [] Time Elapsed 00:00:34.29
      [] Executing - C:\Users\itomkowicz\repros\runtime2\artifacts\bin\dotnet-none\dotnet.exe run -c Debug --no-build  in pwd C:\Users\itomkowicz\repros\runtime2\artifacts\bin\Wasm.Build.Tests\Release\net11.0\win-x64\wbt artifacts\AppSettingsTest_Debug_False_ykaz0bkj_5zt\App
      	[DOTNET_ROOT] = C:\Users\itomkowicz\repros\runtime2\artifacts\bin\dotnet-none
      	[DOTNET_INSTALL_DIR] = C:\Users\itomkowicz\repros\runtime2\artifacts\bin\dotnet-none
      	[DOTNET_SKIP_FIRST_TIME_EXPERIENCE] = 1
      	[PATH] = C:\Users\itomkowicz\repros\runtime2\artifacts\bin\dotnet-none;C:\Users\itomkowicz\repros\runtime2\.dotnet;C:\Program Files\PowerShell\7;c:\Users\itomkowicz\AppData\Roaming\Code\User\globalStorage\github.copilot-chat\debugCommand;c:\Users\itomkowicz\AppData\Roaming\Code\User\globalStorage\github.copilot-chat\copilotCli;C:\Program Files (x86)\Microsoft SDKs\Azure\CLI2\wbin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\System32\OpenSSH\;C:\Program Files\Azure Dev CLI;C:\Program Files\GitHub CLI\;C:\Users\vmadmin\AppData\Local\Microsoft\WindowsApps;C:\Program Files\Microsoft SQL Server\150\Tools\Binn\;C:\.tools\dotnet;C:\.tools\.npm-global;C:\Users\vmadmin\.dotnet\tools;C:\Program Files\NuGet;C:\Windows\system32\config\systemprofile\AppData\Local\Microsoft\WindowsApps;C:\Program Files\Microsoft Dev Box Agent\Scripts;C:\Program Files\dotnet\;C:\Program Files\CMake\bin;C:\Program Files\nodejs\;C:\Program Files\PowerShell\7\;C:\Program Files (x86)\Windows Kits\10\Windows Performance Toolkit\;C:\Program Files\Microsoft SQL Server\170\Tools\Binn\;C:\Program Files\Microsoft SQL Server\Client SDK\ODBC\170\Tools\Binn\;C:\Program Files\Git\cmd;C:\Program Files\Docker\Docker\resources\bin;C:\Users\itomkowicz\AppData\Local\Programs\Python\Python311\Scripts\;C:\Users\itomkowicz\AppData\Local\Programs\Python\Python311\;C:\Users\itomkowicz\AppData\Local\Microsoft\WindowsApps;C:\Program Files\ninja;C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python39_64;C:\Users\itomkowicz\AppData\Local\Programs\Microsoft VS Code\bin;C:\Program Files\v8;C:\Users\itomkowicz\AppData\Local\Microsoft\WinGet\Links;C:\Users\itomkowicz\AppData\Roaming\npm;C:\Users\itomkowicz\.dotnet\tools
      	[EM_WORKAROUND_PYTHON_BUG_34780] = 1
      	[WasmEnableWebCil] = false
      	[WasmTestSupport] = true
      	[WasmTestExitOnUnhandledError] = true
      	[WasmTestLogExitCode] = true
      [] WasmAppHost --use-staticwebassets --runtime-config C:\Users\itomkowicz\repros\runtime2\artifacts\bin\Wasm.Build.Tests\Release\net11.0\win-x64\wbt artifacts\AppSettingsTest_Debug_False_ykaz0bkj_5zt\App\bin\Debug\net11.0\WasmBasicTestApp.runtimeconfig.json
      [] 
      [] App url: http://127.0.0.1:54094/index.html
      [] App url: https://127.0.0.1:54095/index.html
      [] Debug at url: http://127.0.0.1:54094/_framework/debug
      [] Debug at url: https://127.0.0.1:54095/_framework/debug
      Launching chrome ('C:\Program Files\Google\Chrome\Application\chrome.exe') via playwright with args = --explicitly-allowed-ports=54094,--ignore-certificate-errors,--lang=en-US,--headless
      Waiting for page to load
      Waiting for additional 10secs to see if any errors are reported
      [log] TestOutput -> '/appsettings.json' exists 'False'
      [log] TestOutput -> '/appsettings.Development.json' exists 'False'
      [log] TestOutput -> '/appsettings.Production.json' exists 'False'
      Exited with 0
      [log] WASM EXIT 0
      Browser has been disconnected

Is it missing from boot config ?
Or it's in different directory than on Mono ?
Or it was not upacked into VFS at all ?

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[coreclr] `appsettings.json` is Not Bundled in CoreCLR WASM #124895

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[coreclr] appsettings.json is Not Bundled in CoreCLR WASM #124895

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pavelsavara commented on Feb 27, 2026

dotnet-policy-service commented on Apr 13, 2026

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[coreclr] `appsettings.json` is Not Bundled in CoreCLR WASM #124895