Avalonia 11.1 and .net 9.0 update for Wasm

[cangunaydin]

Hello,
I have already had a running avalonia app for web assembly.
Now i am updating my project to .net 9 here is the .csproj file i was using.

<Project Sdk="Microsoft.NET.Sdk">
    <PropertyGroup>
        <TargetFramework>net8.0-browser</TargetFramework>
        <RuntimeIdentifier>browser-wasm</RuntimeIdentifier>
        <WasmMainJSPath>AppBundle\main.js</WasmMainJSPath>
        <OutputType>Exe</OutputType>
        <AvaloniaVersion>11.1.1</AvaloniaVersion>
        <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
        <TrimMode>partial</TrimMode>
        <EmccInitialHeapSize>67108864</EmccInitialHeapSize>
        <RunAOTCompilation>true</RunAOTCompilation>
        <SelfContained>false</SelfContained>
    </PropertyGroup>
    <ItemGroup>
        <WasmExtraFilesToDeploy Include="AppBundle\**"/>
    </ItemGroup>

now when i change my app to support net9.0-browser and if upgrade the avalonia version to 11.1.5 it seems like everything works fine.
I can debug but when i try to publish my app. i am getting an error.

Linking for initial memory $(WasmInitialHeapSize)=67108864 bytes. Set this msbuild property to change the value.
  Linking with emcc with -O2. This may take a while ...
   /opt/hostedtoolcache/dotnet/packs/Microsoft.NET.Runtime.Emscripten.3.1.56.Sdk.linux-x64/9.0.0/tools/bin/clang --version
   /opt/hostedtoolcache/dotnet/packs/Microsoft.NET.Runtime.Emscripten.3.1.56.Node.linux-x64/9.0.0/tools/bin/node /opt/hostedtoolcache/dotnet/packs/Microsoft.NET.Runtime.Emscripten.3.1.56.Sdk.linux-x64/9.0.0/tools/emscripten/src/compiler.mjs /tmp/tmpn_u87gck.json --symbols-only
   /opt/hostedtoolcache/dotnet/packs/Microsoft.NET.Runtime.Emscripten.3.1.56.Sdk.linux-x64/9.0.0/tools/bin/wasm-ld @/tmp/emscripten_cah3p1dc.rsp.utf-8
   /opt/hostedtoolcache/dotnet/packs/Microsoft.NET.Runtime.Emscripten.3.1.56.Sdk.linux-x64/9.0.0/tools/bin/llvm-objcopy /home/vsts/work/1/s/Adzup.Player/Adzup.Player.Browser/obj/Release/net9.0-browser/browser-wasm/wasm/for-publish/dotnet.native.wasm /home/vsts/work/1/s/Adzup.Player/Adzup.Player.Browser/obj/Release/net9.0-browser/browser-wasm/wasm/for-publish/dotnet.native.wasm --remove-section=.debug* --remove-section=producers
   /opt/hostedtoolcache/dotnet/packs/Microsoft.NET.Runtime.Emscripten.3.1.56.Node.linux-x64/9.0.0/tools/bin/node /opt/hostedtoolcache/dotnet/packs/Microsoft.NET.Runtime.Emscripten.3.1.56.Sdk.linux-x64/9.0.0/tools/emscripten/src/compiler.mjs /tmp/tmp10ker1n_.json
   /opt/hostedtoolcache/dotnet/packs/Microsoft.NET.Runtime.Emscripten.3.1.56.Sdk.linux-x64/9.0.0/tools/bin/wasm-opt --strip-target-features --post-emscripten -O2 --low-memory-unused --zero-filled-memory --pass-arg=directize-initial-contents-immutable /home/vsts/work/1/s/Adzup.Player/Adzup.Player.Browser/obj/Release/net9.0-browser/browser-wasm/wasm/for-publish/dotnet.native.wasm -o /home/vsts/work/1/s/Adzup.Player/Adzup.Player.Browser/obj/Release/net9.0-browser/browser-wasm/wasm/for-publish/dotnet.native.wasm -g --mvp-features --enable-threads --enable-bulk-memory --enable-exception-handling --enable-multivalue --enable-mutable-globals --enable-reference-types --enable-sign-ext --enable-simd
   /opt/hostedtoolcache/dotnet/packs/Microsoft.NET.Runtime.Emscripten.3.1.56.Node.linux-x64/9.0.0/tools/bin/node /opt/hostedtoolcache/dotnet/packs/Microsoft.NET.Runtime.Emscripten.3.1.56.Sdk.linux-x64/9.0.0/tools/emscripten/tools/acorn-optimizer.mjs /tmp/emscripten_temp__h341tth/dotnet.native.js JSDCE minifyWhitespace --exportES6 -o /tmp/emscripten_temp__h341tth/dotnet.native.jso1.js
  [wasm-validator error in function av_malloc] unexpected false: Atomic operations require threads [--enable-threads], on 
  (i32.atomic.load
   (i32.const 13803952)
  )
  [wasm-validator error in function av_malloc] unexpected false: Atomic operations require threads [--enable-threads], on 
  (i32.atomic.load
   (i32.const 13803952)
  )
  [wasm-validator error in function av_realloc] unexpected false: Atomic operations require threads [--enable-threads], on 
  (i32.atomic.load
   (i32.const 13803952)
  )
  Fatal: error validating input
/opt/hostedtoolcache/dotnet/packs/Microsoft.NET.Runtime.WebAssembly.Sdk/9.0.0/Sdk/WasmApp.Common.targets(934,5): error MSB3073: The command "wasm-opt --enable-simd --enable-exception-handling --enable-bulk-memory --enable-simd --strip-dwarf "/home/vsts/work/1/s/Adzup.Player/Adzup.Player.Browser/obj/Release/net9.0-browser/browser-wasm/wasm/for-publish/dotnet.native.wasm" -o "/home/vsts/work/1/s/Adzup.Player/Adzup.Player.Browser/obj/Release/net9.0-browser/browser-wasm/wasm/for-publish/dotnet.native.wasm"" exited with code 1. [/home/vsts/work/1/s/Adzup.Player/Adzup.Player.Browser/Adzup.Player.Browser.csproj

it seems like --enable-threading is not passed if i use
<WasmEnableThreads>true</WasmEnableThreads> then i can built but when i visit the page or debug it i am having an error.

i prefer not to update my avalonia app to 11.2 since i have some dependencies. What can i do about it any idea?

[maxkatz6]

i prefer not to update my avalonia app to 11.2 since i have some dependencies

You need to update to 11.2 or stay on .NET 8.
11.1 doesn't support .NET 9 multithreading, because .NET runtime team have reworked multithreading.
You can keep old 11.1 versions but then remove WasmEnableThreads.

AppBundle\main.js

Additionally, you might prefer re-creating browser project from the templates. As they now have pre-configured new WebAssembly SDK with bundle compression enabled.

[cangunaydin]

Thank you for the reply Max,
I think I will try to update to 11.2 and gonna change the templates as you suggested. I have some nuget packages built with 11.1 should I also fork them and built for 11.2 or is 11.2 compatible with 11.1?