Multithreading and WebGL

@unityruba btw, how do we actually enable multithreading?
I've set PlayerSettings.WebGL.threadsSupport to true and now I'm getting some weird error:

[Postprocess built player] Internal build system error. BuildProgram exited with code 1.
System.ArgumentException: You're trying to copy to build/Build/d41d8cd98f00b204e9800998ecf8427e.js more than once. Previously from Library/Bee/artifacts/WebGL/build/debug_WebGL_wasm/build.framework.js and now from Library/Bee/artifacts/WebGL/build/debug_WebGL_wasm/build.worker.js
at Bee.Core.CopyTool.Setup(NPath target, NPath from)
at WebGLPlayerBuildProgram.WebGLPlayer.SetupCompression(NPath input, NPath output)
at WebGLPlayerBuildProgram.WebGLPlayer.SetupPostProcessBuildFile(NPath path)
at WebGLPlayerBuildProgram.WebGLPlayer.SetupPlayerExecutable()+MoveNext()
at System.Collections.Generic.LargeArrayBuilder`1.AddRange(IEnumerable`1 items)
at System.Collections.Generic.SparseArrayBuilder`1.ReserveOrAdd(IEnumerable`1 items)
at System.Linq.Enumerable.ConcatNIterator`1.LazyToArray()
at System.Linq.Enumerable.ConcatNIterator`1.ToArray()
at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)
at PlayerBuildProgramLibrary.PlayerBuildProgramBase.RunBuildProgram()
at PlayerBuildProgramTypeWrapper.Run(String[] args)
at Program.Main(String[] args)

The WebGL template is set to PWA. Any ideas?

 

Ended up just using this package I found on GitHub to accomplish the same thing:
https://forum.unity.com/threads/async-await-and-webgl-builds.472994/page-2#post-6866063
https://github.com/VolodymyrBS/WebGLThreadingPatcher
Thanks @VolodymyrBS !

 

@unityruba 2022.3.0f

 

Any news on progress? Its been a few years of C# multithreading hopes (if not more) with no luck.

 

What's the roadmap about WebGL and C# multithreading for 2024? Is it still a thing working on ?