Sample project for the issue #37 in BlazorWasmPreRendering.Build.

Steps:

• Create a new Blazor WebAssembly App using the template in Visual Studio
• Add package BlazorWasmPreRendering.Build (3.1.0-preview.3)
• Add package SpawnDev.BlazorJS.WebWorkers (2.2.8)
• Extract ConfigureServices in program.cs according to BlazorWasmPreRendering docs
• Register SpawnDev.BlazorJS.WebWorkers services in program.cs
• Add an example worker (IMyWorker.cs, MyWorker.cs)
• Inject WebWorkerService to Counter.razor
• Change IncrementCount() to use the web worker:

private async void IncrementCount()
{
    //currentCount++;
    using var webWorker = await WorkerService.GetWebWorker();
    var myWorker = webWorker.GetService<IMyWorker>();
    var result = await myWorker.Add(currentCount, 1);
}

• Start the app, and press the Click Me button on the Counter page
• BlazorWasmPreRendering.Build.lib.module.js throws an exception when the worker starts, because the DOM is not available in web workers:

MONO_WASM: Failed to invoke 'afterStarted' on library initializer '../_content/BlazorWasmPreRendering.Build/BlazorWasmPreRendering.Build.lib.module.js': TypeError: n.createNodeIterator is not a function